1 /*
2 * Copyright (c) 2003, 2021, 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/resourceArea.hpp"
41 #include "memory/universe.hpp"
42 #include "oops/instanceKlass.hpp"
43 #include "oops/klass.inline.hpp"
44 #include "oops/objArrayOop.inline.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "prims/jniCheck.hpp"
47 #include "prims/jvm_misc.hpp"
48 #include "prims/jvmtiAgentThread.hpp"
49 #include "prims/jvmtiClassFileReconstituter.hpp"
50 #include "prims/jvmtiCodeBlobEvents.hpp"
51 #include "prims/jvmtiExtensions.hpp"
52 #include "prims/jvmtiGetLoadedClasses.hpp"
53 #include "prims/jvmtiImpl.hpp"
54 #include "prims/jvmtiManageCapabilities.hpp"
55 #include "prims/jvmtiRawMonitor.hpp"
56 #include "prims/jvmtiRedefineClasses.hpp"
57 #include "prims/jvmtiTagMap.hpp"
58 #include "prims/jvmtiThreadState.inline.hpp"
59 #include "prims/jvmtiUtil.hpp"
60 #include "runtime/arguments.hpp"
61 #include "runtime/deoptimization.hpp"
62 #include "runtime/fieldDescriptor.inline.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/interfaceSupport.inline.hpp"
65 #include "runtime/javaCalls.hpp"
66 #include "runtime/jfieldIDWorkaround.hpp"
67 #include "runtime/jniHandles.inline.hpp"
68 #include "runtime/objectMonitor.inline.hpp"
69 #include "runtime/osThread.hpp"
70 #include "runtime/reflectionUtils.hpp"
71 #include "runtime/signature.hpp"
72 #include "runtime/thread.inline.hpp"
73 #include "runtime/threadHeapSampler.hpp"
74 #include "runtime/threadSMR.hpp"
75 #include "runtime/timerTrace.hpp"
76 #include "runtime/vframe.inline.hpp"
77 #include "runtime/vmThread.hpp"
78 #include "services/threadService.hpp"
79 #include "utilities/exceptions.hpp"
80 #include "utilities/preserveException.hpp"
81 #include "utilities/utf8.hpp"
82
83
84 #define FIXLATER 0 // REMOVE this when completed.
85
86 // FIXLATER: hook into JvmtiTrace
87 #define TraceJVMTICalls false
88
89 JvmtiEnv::JvmtiEnv(jint version) : JvmtiEnvBase(version) {
90 }
91
92 JvmtiEnv::~JvmtiEnv() {
93 }
94
95 JvmtiEnv*
96 JvmtiEnv::create_a_jvmti(jint version) {
97 return new JvmtiEnv(version);
98 }
99
100 // VM operation class to copy jni function table at safepoint.
101 // More than one java threads or jvmti agents may be reading/
102 // modifying jni function tables. To reduce the risk of bad
103 // interaction b/w these threads it is copied at safepoint.
104 class VM_JNIFunctionTableCopier : public VM_Operation {
105 private:
106 const struct JNINativeInterface_ *_function_table;
107 public:
108 VM_JNIFunctionTableCopier(const struct JNINativeInterface_ *func_tbl) {
109 _function_table = func_tbl;
110 };
111
112 VMOp_Type type() const { return VMOp_JNIFunctionTableCopier; }
113 void doit() {
114 copy_jni_function_table(_function_table);
115 };
116 };
117
118 //
119 // Do not change the "prefix" marker below, everything above it is copied
120 // unchanged into the filled stub, everything below is controlled by the
121 // stub filler (only method bodies are carried forward, and then only for
122 // functionality still in the spec).
123 //
124 // end file prefix
125
126 //
127 // Memory Management functions
128 //
129
130 // mem_ptr - pre-checked for NULL
131 jvmtiError
132 JvmtiEnv::Allocate(jlong size, unsigned char** mem_ptr) {
133 return allocate(size, mem_ptr);
134 } /* end Allocate */
135
136
137 // mem - NULL is a valid value, must be checked
138 jvmtiError
139 JvmtiEnv::Deallocate(unsigned char* mem) {
140 return deallocate(mem);
141 } /* end Deallocate */
142
143 // java_thread - protected by ThreadsListHandle and pre-checked
144 // data - NULL is a valid value, must be checked
145 jvmtiError
146 JvmtiEnv::SetThreadLocalStorage(JavaThread* java_thread, const void* data) {
147 JvmtiThreadState* state = java_thread->jvmti_thread_state();
148 if (state == NULL) {
149 if (data == NULL) {
150 // leaving state unset same as data set to NULL
151 return JVMTI_ERROR_NONE;
152 }
153 // otherwise, create the state
154 state = JvmtiThreadState::state_for(java_thread);
155 if (state == NULL) {
156 return JVMTI_ERROR_THREAD_NOT_ALIVE;
157 }
158 }
159 state->env_thread_state(this)->set_agent_thread_local_storage_data((void*)data);
160 return JVMTI_ERROR_NONE;
161 } /* end SetThreadLocalStorage */
162
163
164 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
165 // data_ptr - pre-checked for NULL
166 jvmtiError
167 JvmtiEnv::GetThreadLocalStorage(jthread thread, void** data_ptr) {
168 JavaThread* current_thread = JavaThread::current();
169 if (thread == NULL) {
170 JvmtiThreadState* state = current_thread->jvmti_thread_state();
171 *data_ptr = (state == NULL) ? NULL :
172 state->env_thread_state(this)->get_agent_thread_local_storage_data();
173 } else {
174 // jvmti_GetThreadLocalStorage is "in native" and doesn't transition
175 // the thread to _thread_in_vm. However, when the TLS for a thread
176 // other than the current thread is required we need to transition
177 // from native so as to resolve the jthread.
178
179 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, current_thread));
180 ThreadInVMfromNative __tiv(current_thread);
181 VM_ENTRY_BASE(jvmtiError, JvmtiEnv::GetThreadLocalStorage , current_thread)
182 debug_only(VMNativeEntryWrapper __vew;)
183
184 JavaThread* java_thread = NULL;
185 ThreadsListHandle tlh(current_thread);
186 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, NULL);
187 if (err != JVMTI_ERROR_NONE) {
188 return err;
189 }
190
191 JvmtiThreadState* state = java_thread->jvmti_thread_state();
192 *data_ptr = (state == NULL) ? NULL :
193 state->env_thread_state(this)->get_agent_thread_local_storage_data();
194 }
195 return JVMTI_ERROR_NONE;
196 } /* end GetThreadLocalStorage */
197
198 //
199 // Module functions
200 //
201
202 // module_count_ptr - pre-checked for NULL
203 // modules_ptr - pre-checked for NULL
204 jvmtiError
205 JvmtiEnv::GetAllModules(jint* module_count_ptr, jobject** modules_ptr) {
206 JvmtiModuleClosure jmc;
207
208 return jmc.get_all_modules(this, module_count_ptr, modules_ptr);
209 } /* end GetAllModules */
210
211
212 // class_loader - NULL is a valid value, must be pre-checked
213 // package_name - pre-checked for NULL
214 // module_ptr - pre-checked for NULL
215 jvmtiError
216 JvmtiEnv::GetNamedModule(jobject class_loader, const char* package_name, jobject* module_ptr) {
217 JavaThread* THREAD = JavaThread::current(); // For exception macros.
218 ResourceMark rm(THREAD);
219 Handle h_loader (THREAD, JNIHandles::resolve(class_loader));
220 // Check that loader is a subclass of java.lang.ClassLoader.
221 if (h_loader.not_null() && !java_lang_ClassLoader::is_subclass(h_loader->klass())) {
222 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
223 }
224 oop module = Modules::get_named_module(h_loader, package_name);
225 *module_ptr = module != NULL ? JNIHandles::make_local(THREAD, module) : NULL;
226 return JVMTI_ERROR_NONE;
227 } /* end GetNamedModule */
228
229
230 // module - pre-checked for NULL
231 // to_module - pre-checked for NULL
232 jvmtiError
233 JvmtiEnv::AddModuleReads(jobject module, jobject to_module) {
234 JavaThread* THREAD = JavaThread::current(); // For exception macros.
235
236 // check module
237 Handle h_module(THREAD, JNIHandles::resolve(module));
238 if (!java_lang_Module::is_instance(h_module())) {
239 return JVMTI_ERROR_INVALID_MODULE;
240 }
241 // check to_module
242 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
243 if (!java_lang_Module::is_instance(h_to_module())) {
244 return JVMTI_ERROR_INVALID_MODULE;
245 }
246 return JvmtiExport::add_module_reads(h_module, h_to_module, THREAD);
247 } /* end AddModuleReads */
248
249
250 // module - pre-checked for NULL
251 // pkg_name - pre-checked for NULL
252 // to_module - pre-checked for NULL
253 jvmtiError
254 JvmtiEnv::AddModuleExports(jobject module, const char* pkg_name, jobject to_module) {
255 JavaThread* THREAD = JavaThread::current(); // For exception macros.
256 Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD);
257
258 // check module
259 Handle h_module(THREAD, JNIHandles::resolve(module));
260 if (!java_lang_Module::is_instance(h_module())) {
261 return JVMTI_ERROR_INVALID_MODULE;
262 }
263 // check to_module
264 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
265 if (!java_lang_Module::is_instance(h_to_module())) {
266 return JVMTI_ERROR_INVALID_MODULE;
267 }
268 return JvmtiExport::add_module_exports(h_module, h_pkg, h_to_module, THREAD);
269 } /* end AddModuleExports */
270
271
272 // module - pre-checked for NULL
273 // pkg_name - pre-checked for NULL
274 // to_module - pre-checked for NULL
275 jvmtiError
276 JvmtiEnv::AddModuleOpens(jobject module, const char* pkg_name, jobject to_module) {
277 JavaThread* THREAD = JavaThread::current(); // For exception macros.
278 Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD);
279
280 // check module
281 Handle h_module(THREAD, JNIHandles::resolve(module));
282 if (!java_lang_Module::is_instance(h_module())) {
283 return JVMTI_ERROR_INVALID_MODULE;
284 }
285 // check to_module
286 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
287 if (!java_lang_Module::is_instance(h_to_module())) {
288 return JVMTI_ERROR_INVALID_MODULE;
289 }
290 return JvmtiExport::add_module_opens(h_module, h_pkg, h_to_module, THREAD);
291 } /* end AddModuleOpens */
292
293
294 // module - pre-checked for NULL
295 // service - pre-checked for NULL
296 jvmtiError
297 JvmtiEnv::AddModuleUses(jobject module, jclass service) {
298 JavaThread* THREAD = JavaThread::current(); // For exception macros.
299
300 // check module
301 Handle h_module(THREAD, JNIHandles::resolve(module));
302 if (!java_lang_Module::is_instance(h_module())) {
303 return JVMTI_ERROR_INVALID_MODULE;
304 }
305 // check service
306 Handle h_service(THREAD, JNIHandles::resolve_external_guard(service));
307 if (!java_lang_Class::is_instance(h_service()) ||
308 java_lang_Class::is_primitive(h_service())) {
309 return JVMTI_ERROR_INVALID_CLASS;
310 }
311 return JvmtiExport::add_module_uses(h_module, h_service, THREAD);
312 } /* end AddModuleUses */
313
314
315 // module - pre-checked for NULL
316 // service - pre-checked for NULL
317 // impl_class - pre-checked for NULL
318 jvmtiError
319 JvmtiEnv::AddModuleProvides(jobject module, jclass service, jclass impl_class) {
320 JavaThread* THREAD = JavaThread::current(); // For exception macros.
321
322 // check module
323 Handle h_module(THREAD, JNIHandles::resolve(module));
324 if (!java_lang_Module::is_instance(h_module())) {
325 return JVMTI_ERROR_INVALID_MODULE;
326 }
327 // check service
328 Handle h_service(THREAD, JNIHandles::resolve_external_guard(service));
329 if (!java_lang_Class::is_instance(h_service()) ||
330 java_lang_Class::is_primitive(h_service())) {
331 return JVMTI_ERROR_INVALID_CLASS;
332 }
333 // check impl_class
334 Handle h_impl_class(THREAD, JNIHandles::resolve_external_guard(impl_class));
335 if (!java_lang_Class::is_instance(h_impl_class()) ||
336 java_lang_Class::is_primitive(h_impl_class())) {
337 return JVMTI_ERROR_INVALID_CLASS;
338 }
339 return JvmtiExport::add_module_provides(h_module, h_service, h_impl_class, THREAD);
340 } /* end AddModuleProvides */
341
342 // module - pre-checked for NULL
343 // is_modifiable_class_ptr - pre-checked for NULL
344 jvmtiError
345 JvmtiEnv::IsModifiableModule(jobject module, jboolean* is_modifiable_module_ptr) {
346 JavaThread* current = JavaThread::current();
347
348 // check module
349 Handle h_module(current, JNIHandles::resolve(module));
350 if (!java_lang_Module::is_instance(h_module())) {
351 return JVMTI_ERROR_INVALID_MODULE;
352 }
353
354 *is_modifiable_module_ptr = JNI_TRUE;
355 return JVMTI_ERROR_NONE;
356 } /* end IsModifiableModule */
357
358
359 //
360 // Class functions
361 //
362
363 // class_count_ptr - pre-checked for NULL
364 // classes_ptr - pre-checked for NULL
365 jvmtiError
366 JvmtiEnv::GetLoadedClasses(jint* class_count_ptr, jclass** classes_ptr) {
367 return JvmtiGetLoadedClasses::getLoadedClasses(this, class_count_ptr, classes_ptr);
368 } /* end GetLoadedClasses */
369
370
371 // initiating_loader - NULL is a valid value, must be checked
372 // class_count_ptr - pre-checked for NULL
373 // classes_ptr - pre-checked for NULL
374 jvmtiError
375 JvmtiEnv::GetClassLoaderClasses(jobject initiating_loader, jint* class_count_ptr, jclass** classes_ptr) {
376 return JvmtiGetLoadedClasses::getClassLoaderClasses(this, initiating_loader,
377 class_count_ptr, classes_ptr);
378 } /* end GetClassLoaderClasses */
379
380 // k_mirror - may be primitive, this must be checked
381 // is_modifiable_class_ptr - pre-checked for NULL
382 jvmtiError
383 JvmtiEnv::IsModifiableClass(oop k_mirror, jboolean* is_modifiable_class_ptr) {
384 *is_modifiable_class_ptr = VM_RedefineClasses::is_modifiable_class(k_mirror)?
385 JNI_TRUE : JNI_FALSE;
386 return JVMTI_ERROR_NONE;
387 } /* end IsModifiableClass */
388
389 // class_count - pre-checked to be greater than or equal to 0
390 // classes - pre-checked for NULL
391 jvmtiError
392 JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
393 //TODO: add locking
394
395 int index;
396 JavaThread* current_thread = JavaThread::current();
397 ResourceMark rm(current_thread);
398
399 jvmtiClassDefinition* class_definitions =
400 NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count);
401 NULL_CHECK(class_definitions, JVMTI_ERROR_OUT_OF_MEMORY);
402
403 for (index = 0; index < class_count; index++) {
404 HandleMark hm(current_thread);
405
406 jclass jcls = classes[index];
407 oop k_mirror = JNIHandles::resolve_external_guard(jcls);
408 if (k_mirror == NULL) {
409 return JVMTI_ERROR_INVALID_CLASS;
410 }
411 if (!k_mirror->is_a(vmClasses::Class_klass())) {
412 return JVMTI_ERROR_INVALID_CLASS;
413 }
414
415 if (!VM_RedefineClasses::is_modifiable_class(k_mirror)) {
416 return JVMTI_ERROR_UNMODIFIABLE_CLASS;
417 }
418
419 Klass* klass = java_lang_Class::as_Klass(k_mirror);
420
421 jint status = klass->jvmti_class_status();
422 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
423 return JVMTI_ERROR_INVALID_CLASS;
424 }
425
426 InstanceKlass* ik = InstanceKlass::cast(klass);
427 if (ik->get_cached_class_file_bytes() == NULL) {
428 // Not cached, we need to reconstitute the class file from the
429 // VM representation. We don't attach the reconstituted class
430 // bytes to the InstanceKlass here because they have not been
431 // validated and we're not at a safepoint.
432 JvmtiClassFileReconstituter reconstituter(ik);
433 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
434 return reconstituter.get_error();
435 }
436
437 class_definitions[index].class_byte_count = (jint)reconstituter.class_file_size();
438 class_definitions[index].class_bytes = (unsigned char*)
439 reconstituter.class_file_bytes();
440 } else {
441 // it is cached, get it from the cache
442 class_definitions[index].class_byte_count = ik->get_cached_class_file_len();
443 class_definitions[index].class_bytes = ik->get_cached_class_file_bytes();
444 }
445 class_definitions[index].klass = jcls;
446 }
447 EventRetransformClasses event;
448 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
449 VMThread::execute(&op);
450 jvmtiError error = op.check_error();
451 if (error == JVMTI_ERROR_NONE) {
452 event.set_classCount(class_count);
453 event.set_redefinitionId(op.id());
454 event.commit();
455 }
456 return error;
457 } /* end RetransformClasses */
458
459
460 // class_count - pre-checked to be greater than or equal to 0
461 // class_definitions - pre-checked for NULL
462 jvmtiError
463 JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) {
464 //TODO: add locking
465 EventRedefineClasses event;
466 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
467 VMThread::execute(&op);
468 jvmtiError error = op.check_error();
469 if (error == JVMTI_ERROR_NONE) {
470 event.set_classCount(class_count);
471 event.set_redefinitionId(op.id());
472 event.commit();
473 }
474 return error;
475 } /* end RedefineClasses */
476
477
478 //
479 // Object functions
480 //
481
482 // size_ptr - pre-checked for NULL
483 jvmtiError
484 JvmtiEnv::GetObjectSize(jobject object, jlong* size_ptr) {
485 oop mirror = JNIHandles::resolve_external_guard(object);
486 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
487 *size_ptr = (jlong)mirror->size() * wordSize;
488 return JVMTI_ERROR_NONE;
489 } /* end GetObjectSize */
490
491 //
492 // Method functions
493 //
494
495 // prefix - NULL is a valid value, must be checked
496 jvmtiError
497 JvmtiEnv::SetNativeMethodPrefix(const char* prefix) {
498 return prefix == NULL?
499 SetNativeMethodPrefixes(0, NULL) :
500 SetNativeMethodPrefixes(1, (char**)&prefix);
501 } /* end SetNativeMethodPrefix */
502
503
504 // prefix_count - pre-checked to be greater than or equal to 0
505 // prefixes - pre-checked for NULL
506 jvmtiError
507 JvmtiEnv::SetNativeMethodPrefixes(jint prefix_count, char** prefixes) {
508 // Have to grab JVMTI thread state lock to be sure that some thread
509 // isn't accessing the prefixes at the same time we are setting them.
510 // No locks during VM bring-up.
511 if (Threads::number_of_threads() == 0) {
512 return set_native_method_prefixes(prefix_count, prefixes);
513 } else {
514 MutexLocker mu(JvmtiThreadState_lock);
515 return set_native_method_prefixes(prefix_count, prefixes);
516 }
517 } /* end SetNativeMethodPrefixes */
518
519 //
520 // Event Management functions
521 //
522
523 // callbacks - NULL is a valid value, must be checked
524 // size_of_callbacks - pre-checked to be greater than or equal to 0
525 jvmtiError
526 JvmtiEnv::SetEventCallbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) {
527 JvmtiEventController::set_event_callbacks(this, callbacks, size_of_callbacks);
528 return JVMTI_ERROR_NONE;
529 } /* end SetEventCallbacks */
530
531
532 // event_thread - NULL is a valid value, must be checked
533 jvmtiError
534 JvmtiEnv::SetEventNotificationMode(jvmtiEventMode mode, jvmtiEvent event_type, jthread event_thread, ...) {
535 if (event_thread == NULL) {
536 // Can be called at Agent_OnLoad() time with event_thread == NULL
537 // when Thread::current() does not work yet so we cannot create a
538 // ThreadsListHandle that is common to both thread-specific and
539 // global code paths.
540
541 // event_type must be valid
542 if (!JvmtiEventController::is_valid_event_type(event_type)) {
543 return JVMTI_ERROR_INVALID_EVENT_TYPE;
544 }
545
546 bool enabled = (mode == JVMTI_ENABLE);
547
548 // assure that needed capabilities are present
549 if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) {
550 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
551 }
552
553 if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) {
554 record_class_file_load_hook_enabled();
555 }
556
557 JvmtiEventController::set_user_enabled(this, (JavaThread*) NULL, event_type, enabled);
558 } else {
559 // We have a specified event_thread.
560 JavaThread* java_thread = NULL;
561 ThreadsListHandle tlh;
562 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), event_thread, &java_thread, NULL);
563 if (err != JVMTI_ERROR_NONE) {
564 return err;
565 }
566
567 // event_type must be valid
568 if (!JvmtiEventController::is_valid_event_type(event_type)) {
569 return JVMTI_ERROR_INVALID_EVENT_TYPE;
570 }
571
572 // global events cannot be controlled at thread level.
573 if (JvmtiEventController::is_global_event(event_type)) {
574 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
575 }
576
577 bool enabled = (mode == JVMTI_ENABLE);
578
579 // assure that needed capabilities are present
580 if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) {
581 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
582 }
583
584 if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) {
585 record_class_file_load_hook_enabled();
586 }
587 JvmtiEventController::set_user_enabled(this, java_thread, event_type, enabled);
588 }
589
590 return JVMTI_ERROR_NONE;
591 } /* end SetEventNotificationMode */
592
593 //
594 // Capability functions
595 //
596
597 // capabilities_ptr - pre-checked for NULL
598 jvmtiError
599 JvmtiEnv::GetPotentialCapabilities(jvmtiCapabilities* capabilities_ptr) {
600 JvmtiManageCapabilities::get_potential_capabilities(get_capabilities(),
601 get_prohibited_capabilities(),
602 capabilities_ptr);
603 return JVMTI_ERROR_NONE;
604 } /* end GetPotentialCapabilities */
605
606
607 // capabilities_ptr - pre-checked for NULL
608 jvmtiError
609 JvmtiEnv::AddCapabilities(const jvmtiCapabilities* capabilities_ptr) {
610 return JvmtiManageCapabilities::add_capabilities(get_capabilities(),
611 get_prohibited_capabilities(),
612 capabilities_ptr,
613 get_capabilities());
614 } /* end AddCapabilities */
615
616
617 // capabilities_ptr - pre-checked for NULL
618 jvmtiError
619 JvmtiEnv::RelinquishCapabilities(const jvmtiCapabilities* capabilities_ptr) {
620 JvmtiManageCapabilities::relinquish_capabilities(get_capabilities(), capabilities_ptr, get_capabilities());
621 return JVMTI_ERROR_NONE;
622 } /* end RelinquishCapabilities */
623
624
625 // capabilities_ptr - pre-checked for NULL
626 jvmtiError
627 JvmtiEnv::GetCapabilities(jvmtiCapabilities* capabilities_ptr) {
628 JvmtiManageCapabilities::copy_capabilities(get_capabilities(), capabilities_ptr);
629 return JVMTI_ERROR_NONE;
630 } /* end GetCapabilities */
631
632 //
633 // Class Loader Search functions
634 //
635
636 // segment - pre-checked for NULL
637 jvmtiError
638 JvmtiEnv::AddToBootstrapClassLoaderSearch(const char* segment) {
639 jvmtiPhase phase = get_phase();
640 if (phase == JVMTI_PHASE_ONLOAD) {
641 Arguments::append_sysclasspath(segment);
642 return JVMTI_ERROR_NONE;
643 } else if (use_version_1_0_semantics()) {
644 // This JvmtiEnv requested version 1.0 semantics and this function
645 // is only allowed in the ONLOAD phase in version 1.0 so we need to
646 // return an error here.
647 return JVMTI_ERROR_WRONG_PHASE;
648 } else if (phase == JVMTI_PHASE_LIVE) {
649 // The phase is checked by the wrapper that called this function,
650 // but this thread could be racing with the thread that is
651 // terminating the VM so we check one more time.
652
653 // create the zip entry
654 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, true);
655 if (zip_entry == NULL) {
656 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
657 }
658
659 // add the jar file to the bootclasspath
660 log_info(class, load)("opened: %s", zip_entry->name());
661 #if INCLUDE_CDS
662 ClassLoaderExt::append_boot_classpath(zip_entry);
663 #else
664 ClassLoader::add_to_boot_append_entries(zip_entry);
665 #endif
666 return JVMTI_ERROR_NONE;
667 } else {
668 return JVMTI_ERROR_WRONG_PHASE;
669 }
670
671 } /* end AddToBootstrapClassLoaderSearch */
672
673
674 // segment - pre-checked for NULL
675 jvmtiError
676 JvmtiEnv::AddToSystemClassLoaderSearch(const char* segment) {
677 jvmtiPhase phase = get_phase();
678
679 if (phase == JVMTI_PHASE_ONLOAD) {
680 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
681 if (strcmp("java.class.path", p->key()) == 0) {
682 p->append_value(segment);
683 break;
684 }
685 }
686 return JVMTI_ERROR_NONE;
687 } else if (phase == JVMTI_PHASE_LIVE) {
688 // The phase is checked by the wrapper that called this function,
689 // but this thread could be racing with the thread that is
690 // terminating the VM so we check one more time.
691 JavaThread* THREAD = JavaThread::current(); // For exception macros.
692 HandleMark hm(THREAD);
693
694 // create the zip entry (which will open the zip file and hence
695 // check that the segment is indeed a zip file).
696 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, false);
697 if (zip_entry == NULL) {
698 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
699 }
700 delete zip_entry; // no longer needed
701
702 // lock the loader
703 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
704 ObjectLocker ol(loader, THREAD);
705
706 // need the path as java.lang.String
707 Handle path = java_lang_String::create_from_platform_dependent_str(segment, THREAD);
708 if (HAS_PENDING_EXCEPTION) {
709 CLEAR_PENDING_EXCEPTION;
710 return JVMTI_ERROR_INTERNAL;
711 }
712
713 // Invoke the appendToClassPathForInstrumentation method - if the method
714 // is not found it means the loader doesn't support adding to the class path
715 // in the live phase.
716 {
717 JavaValue res(T_VOID);
718 JavaCalls::call_special(&res,
719 loader,
720 loader->klass(),
721 vmSymbols::appendToClassPathForInstrumentation_name(),
722 vmSymbols::appendToClassPathForInstrumentation_signature(),
723 path,
724 THREAD);
725 if (HAS_PENDING_EXCEPTION) {
726 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
727 CLEAR_PENDING_EXCEPTION;
728
729 if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) {
730 return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED;
731 } else {
732 return JVMTI_ERROR_INTERNAL;
733 }
734 }
735 }
736
737 return JVMTI_ERROR_NONE;
738 } else {
739 return JVMTI_ERROR_WRONG_PHASE;
740 }
741 } /* end AddToSystemClassLoaderSearch */
742
743 //
744 // General functions
745 //
746
747 // phase_ptr - pre-checked for NULL
748 jvmtiError
749 JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) {
750 *phase_ptr = phase();
751 return JVMTI_ERROR_NONE;
752 } /* end GetPhase */
753
754
755 jvmtiError
756 JvmtiEnv::DisposeEnvironment() {
757 dispose();
758 return JVMTI_ERROR_NONE;
759 } /* end DisposeEnvironment */
760
761
762 // data - NULL is a valid value, must be checked
763 jvmtiError
764 JvmtiEnv::SetEnvironmentLocalStorage(const void* data) {
765 set_env_local_storage(data);
766 return JVMTI_ERROR_NONE;
767 } /* end SetEnvironmentLocalStorage */
768
769
770 // data_ptr - pre-checked for NULL
771 jvmtiError
772 JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) {
773 *data_ptr = (void*)get_env_local_storage();
774 return JVMTI_ERROR_NONE;
775 } /* end GetEnvironmentLocalStorage */
776
777 // version_ptr - pre-checked for NULL
778 jvmtiError
779 JvmtiEnv::GetVersionNumber(jint* version_ptr) {
780 *version_ptr = JVMTI_VERSION;
781 return JVMTI_ERROR_NONE;
782 } /* end GetVersionNumber */
783
784
785 // name_ptr - pre-checked for NULL
786 jvmtiError
787 JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) {
788 if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) {
789 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
790 }
791 const char *name = JvmtiUtil::error_name(error);
792 if (name == NULL) {
793 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
794 }
795 size_t len = strlen(name) + 1;
796 jvmtiError err = allocate(len, (unsigned char**)name_ptr);
797 if (err == JVMTI_ERROR_NONE) {
798 memcpy(*name_ptr, name, len);
799 }
800 return err;
801 } /* end GetErrorName */
802
803
804 jvmtiError
805 JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) {
806 LogLevelType level = value == 0 ? LogLevel::Off : LogLevel::Info;
807 switch (flag) {
808 case JVMTI_VERBOSE_OTHER:
809 // ignore
810 break;
811 case JVMTI_VERBOSE_CLASS:
812 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, unload));
813 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, load));
814 break;
815 case JVMTI_VERBOSE_GC:
816 LogConfiguration::configure_stdout(level, true, LOG_TAGS(gc));
817 break;
818 case JVMTI_VERBOSE_JNI:
819 level = value == 0 ? LogLevel::Off : LogLevel::Debug;
820 LogConfiguration::configure_stdout(level, true, LOG_TAGS(jni, resolve));
821 break;
822 default:
823 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
824 };
825 return JVMTI_ERROR_NONE;
826 } /* end SetVerboseFlag */
827
828
829 // format_ptr - pre-checked for NULL
830 jvmtiError
831 JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) {
832 *format_ptr = JVMTI_JLOCATION_JVMBCI;
833 return JVMTI_ERROR_NONE;
834 } /* end GetJLocationFormat */
835
836 //
837 // Thread functions
838 //
839
840 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
841 // thread_state_ptr - pre-checked for NULL
842 jvmtiError
843 JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) {
844 JavaThread* current_thread = JavaThread::current();
845 JavaThread* java_thread = NULL;
846 oop thread_oop = NULL;
847 ThreadsListHandle tlh(current_thread);
848
849 if (thread == NULL) {
850 java_thread = current_thread;
851 thread_oop = java_thread->threadObj();
852
853 if (thread_oop == NULL || !thread_oop->is_a(vmClasses::Thread_klass())) {
854 return JVMTI_ERROR_INVALID_THREAD;
855 }
856 } else {
857 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
858 if (err != JVMTI_ERROR_NONE) {
859 // We got an error code so we don't have a JavaThread *, but
860 // only return an error from here if we didn't get a valid
861 // thread_oop.
862 if (thread_oop == NULL) {
863 return err;
864 }
865 // We have a valid thread_oop so we can return some thread state.
866 }
867 }
868
869 // get most state bits
870 jint state = (jint)java_lang_Thread::get_thread_status(thread_oop);
871
872 if (java_thread != NULL) {
873 // We have a JavaThread* so add more state bits.
874 JavaThreadState jts = java_thread->thread_state();
875
876 if (java_thread->is_suspended()) {
877 state |= JVMTI_THREAD_STATE_SUSPENDED;
878 }
879 if (jts == _thread_in_native) {
880 state |= JVMTI_THREAD_STATE_IN_NATIVE;
881 }
882 if (java_thread->is_interrupted(false)) {
883 state |= JVMTI_THREAD_STATE_INTERRUPTED;
884 }
885 }
886
887 *thread_state_ptr = state;
888 return JVMTI_ERROR_NONE;
889 } /* end GetThreadState */
890
891
892 // thread_ptr - pre-checked for NULL
893 jvmtiError
894 JvmtiEnv::GetCurrentThread(jthread* thread_ptr) {
895 JavaThread* current_thread = JavaThread::current();
896 *thread_ptr = (jthread)JNIHandles::make_local(current_thread, current_thread->threadObj());
897 return JVMTI_ERROR_NONE;
898 } /* end GetCurrentThread */
899
900
901 // threads_count_ptr - pre-checked for NULL
902 // threads_ptr - pre-checked for NULL
903 jvmtiError
904 JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) {
905 int nthreads = 0;
906 Handle *thread_objs = NULL;
907 Thread* current_thread = Thread::current();
908 ResourceMark rm(current_thread);
909 HandleMark hm(current_thread);
910
911 // enumerate threads (including agent threads)
912 ThreadsListEnumerator tle(current_thread, true);
913 nthreads = tle.num_threads();
914 *threads_count_ptr = nthreads;
915
916 if (nthreads == 0) {
917 *threads_ptr = NULL;
918 return JVMTI_ERROR_NONE;
919 }
920
921 thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads);
922 NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY);
923
924 for (int i = 0; i < nthreads; i++) {
925 thread_objs[i] = Handle(tle.get_threadObj(i));
926 }
927
928 jthread *jthreads = new_jthreadArray(nthreads, thread_objs);
929 NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY);
930
931 *threads_ptr = jthreads;
932 return JVMTI_ERROR_NONE;
933 } /* end GetAllThreads */
934
935
936 // java_thread - protected by ThreadsListHandle and pre-checked
937 jvmtiError
938 JvmtiEnv::SuspendThread(JavaThread* java_thread) {
939 // don't allow hidden thread suspend request.
940 if (java_thread->is_hidden_from_external_view()) {
941 return JVMTI_ERROR_NONE;
942 }
943 if (java_thread->is_suspended()) {
944 return JVMTI_ERROR_THREAD_SUSPENDED;
945 }
946 if (!JvmtiSuspendControl::suspend(java_thread)) {
947 // Either the thread is already suspended or
948 // it was in the process of exiting.
949 if (java_thread->is_exiting()) {
950 return JVMTI_ERROR_THREAD_NOT_ALIVE;
951 }
952 return JVMTI_ERROR_THREAD_SUSPENDED;
953 }
954 return JVMTI_ERROR_NONE;
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 int self_index = -1;
964 int needSafepoint = 0; // > 0 if we need a safepoint
965 JavaThread* current = JavaThread::current();
966 ThreadsListHandle tlh(current);
967 for (int i = 0; i < request_count; i++) {
968 JavaThread *java_thread = NULL;
969 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), request_list[i], &java_thread, NULL);
970 if (err != JVMTI_ERROR_NONE) {
971 results[i] = err;
972 continue;
973 }
974 // don't allow hidden thread suspend request.
975 if (java_thread->is_hidden_from_external_view()) {
976 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend
977 continue;
978 }
979 if (java_thread->is_suspended()) {
980 results[i] = JVMTI_ERROR_THREAD_SUSPENDED;
981 continue;
982 }
983 if (java_thread == current) {
984 self_index = i;
985 continue;
986 }
987 if (!JvmtiSuspendControl::suspend(java_thread)) {
988 // Either the thread is already suspended or
989 // it was in the process of exiting.
990 if (java_thread->is_exiting()) {
991 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
992 continue;
993 }
994 results[i] = JVMTI_ERROR_THREAD_SUSPENDED;
995 continue;
996 }
997 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend
998 }
999 if (self_index >= 0) {
1000 if (!JvmtiSuspendControl::suspend(current)) {
1001 // Either the thread is already suspended or
1002 // it was in the process of exiting.
1003 if (current->is_exiting()) {
1004 results[self_index] = JVMTI_ERROR_THREAD_NOT_ALIVE;
1005 } else {
1006 results[self_index] = JVMTI_ERROR_THREAD_SUSPENDED;
1007 }
1008 } else {
1009 results[self_index] = JVMTI_ERROR_NONE; // indicate successful suspend
1010 }
1011 }
1012 // per-thread suspend results returned via results parameter
1013 return JVMTI_ERROR_NONE;
1014 } /* end SuspendThreadList */
1015
1016
1017 // java_thread - protected by ThreadsListHandle and pre-checked
1018 jvmtiError
1019 JvmtiEnv::ResumeThread(JavaThread* java_thread) {
1020 // don't allow hidden thread resume request.
1021 if (java_thread->is_hidden_from_external_view()) {
1022 return JVMTI_ERROR_NONE;
1023 }
1024 if (!java_thread->is_suspended()) {
1025 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1026 }
1027 if (!JvmtiSuspendControl::resume(java_thread)) {
1028 return JVMTI_ERROR_INTERNAL;
1029 }
1030 return JVMTI_ERROR_NONE;
1031 } /* end ResumeThread */
1032
1033
1034 // request_count - pre-checked to be greater than or equal to 0
1035 // request_list - pre-checked for NULL
1036 // results - pre-checked for NULL
1037 jvmtiError
1038 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
1039 ThreadsListHandle tlh;
1040 for (int i = 0; i < request_count; i++) {
1041 JavaThread* java_thread = NULL;
1042 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), request_list[i], &java_thread, NULL);
1043 if (err != JVMTI_ERROR_NONE) {
1044 results[i] = err;
1045 continue;
1046 }
1047 // don't allow hidden thread resume request.
1048 if (java_thread->is_hidden_from_external_view()) {
1049 results[i] = JVMTI_ERROR_NONE; // indicate successful resume
1050 continue;
1051 }
1052 if (!java_thread->is_suspended()) {
1053 results[i] = JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1054 continue;
1055 }
1056
1057 if (!JvmtiSuspendControl::resume(java_thread)) {
1058 results[i] = JVMTI_ERROR_INTERNAL;
1059 continue;
1060 }
1061
1062 results[i] = JVMTI_ERROR_NONE; // indicate successful resume
1063 }
1064 // per-thread resume results returned via results parameter
1065 return JVMTI_ERROR_NONE;
1066 } /* end ResumeThreadList */
1067
1068
1069 // java_thread - protected by ThreadsListHandle and pre-checked
1070 jvmtiError
1071 JvmtiEnv::StopThread(JavaThread* java_thread, jobject exception) {
1072 oop e = JNIHandles::resolve_external_guard(exception);
1073 NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
1074
1075 JavaThread::send_async_exception(java_thread, e);
1076
1077 return JVMTI_ERROR_NONE;
1078
1079 } /* end StopThread */
1080
1081
1082 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1083 jvmtiError
1084 JvmtiEnv::InterruptThread(jthread thread) {
1085 JavaThread* current_thread = JavaThread::current();
1086 JavaThread* java_thread = NULL;
1087 ThreadsListHandle tlh(current_thread);
1088 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, NULL);
1089 if (err != JVMTI_ERROR_NONE) {
1090 return err;
1091 }
1092 // Really this should be a Java call to Thread.interrupt to ensure the same
1093 // semantics, however historically this has not been done for some reason.
1094 // So we continue with that (which means we don't interact with any Java-level
1095 // Interruptible object) but we must set the Java-level interrupted state.
1096 java_lang_Thread::set_interrupted(JNIHandles::resolve(thread), true);
1097 java_thread->interrupt();
1098
1099 return JVMTI_ERROR_NONE;
1100 } /* end InterruptThread */
1101
1102
1103 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1104 // info_ptr - pre-checked for NULL
1105 jvmtiError
1106 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
1107 JavaThread* current_thread = JavaThread::current();
1108 ResourceMark rm(current_thread);
1109 HandleMark hm(current_thread);
1110
1111 ThreadsListHandle tlh(current_thread);
1112
1113 // if thread is NULL the current thread is used
1114 oop thread_oop = NULL;
1115 if (thread == NULL) {
1116 thread_oop = current_thread->threadObj();
1117 if (thread_oop == NULL || !thread_oop->is_a(vmClasses::Thread_klass())) {
1118 return JVMTI_ERROR_INVALID_THREAD;
1119 }
1120 } else {
1121 JavaThread* java_thread = NULL;
1122 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1123 if (err != JVMTI_ERROR_NONE) {
1124 // We got an error code so we don't have a JavaThread *, but
1125 // only return an error from here if we didn't get a valid
1126 // thread_oop.
1127 if (thread_oop == NULL) {
1128 return err;
1129 }
1130 // We have a valid thread_oop so we can return some thread info.
1131 }
1132 }
1133
1134 Handle thread_obj(current_thread, thread_oop);
1135 Handle name;
1136 ThreadPriority priority;
1137 Handle thread_group;
1138 Handle context_class_loader;
1139 bool is_daemon;
1140
1141 name = Handle(current_thread, java_lang_Thread::name(thread_obj()));
1142 priority = java_lang_Thread::priority(thread_obj());
1143 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
1144 is_daemon = java_lang_Thread::is_daemon(thread_obj());
1145
1146 oop loader = java_lang_Thread::context_class_loader(thread_obj());
1147 context_class_loader = Handle(current_thread, loader);
1148
1149 { const char *n;
1150
1151 if (name() != NULL) {
1152 n = java_lang_String::as_utf8_string(name());
1153 } else {
1154 int utf8_length = 0;
1155 n = UNICODE::as_utf8((jchar*) NULL, utf8_length);
1156 }
1157
1158 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
1159 if (info_ptr->name == NULL)
1160 return JVMTI_ERROR_OUT_OF_MEMORY;
1161
1162 strcpy(info_ptr->name, n);
1163 }
1164 info_ptr->is_daemon = is_daemon;
1165 info_ptr->priority = priority;
1166
1167 info_ptr->context_class_loader = (context_class_loader.is_null()) ? NULL :
1168 jni_reference(context_class_loader);
1169 info_ptr->thread_group = jni_reference(thread_group);
1170
1171 return JVMTI_ERROR_NONE;
1172 } /* end GetThreadInfo */
1173
1174
1175 // java_thread - protected by ThreadsListHandle and pre-checked
1176 // owned_monitor_count_ptr - pre-checked for NULL
1177 // owned_monitors_ptr - pre-checked for NULL
1178 jvmtiError
1179 JvmtiEnv::GetOwnedMonitorInfo(JavaThread* java_thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
1180 jvmtiError err = JVMTI_ERROR_NONE;
1181 JavaThread* calling_thread = JavaThread::current();
1182
1183 EscapeBarrier eb(true, calling_thread, java_thread);
1184 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1185 return JVMTI_ERROR_OUT_OF_MEMORY;
1186 }
1187
1188 // growable array of jvmti monitors info on the C-heap
1189 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1190 new (ResourceObj::C_HEAP, mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1191
1192 // It is only safe to perform the direct operation on the current
1193 // thread. All other usage needs to use a direct handshake for safety.
1194 if (java_thread == calling_thread) {
1195 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1196 } else {
1197 // get owned monitors info with handshake
1198 GetOwnedMonitorInfoClosure op(calling_thread, this, owned_monitors_list);
1199 Handshake::execute(&op, java_thread);
1200 err = op.result();
1201 }
1202 jint owned_monitor_count = owned_monitors_list->length();
1203 if (err == JVMTI_ERROR_NONE) {
1204 if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1205 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1206 // copy into the returned array
1207 for (int i = 0; i < owned_monitor_count; i++) {
1208 (*owned_monitors_ptr)[i] =
1209 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1210 }
1211 *owned_monitor_count_ptr = owned_monitor_count;
1212 }
1213 }
1214 // clean up.
1215 for (int i = 0; i < owned_monitor_count; i++) {
1216 deallocate((unsigned char*)owned_monitors_list->at(i));
1217 }
1218 delete owned_monitors_list;
1219
1220 return err;
1221 } /* end GetOwnedMonitorInfo */
1222
1223
1224 // java_thread - protected by ThreadsListHandle and pre-checked
1225 // monitor_info_count_ptr - pre-checked for NULL
1226 // monitor_info_ptr - pre-checked for NULL
1227 jvmtiError
1228 JvmtiEnv::GetOwnedMonitorStackDepthInfo(JavaThread* java_thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1229 jvmtiError err = JVMTI_ERROR_NONE;
1230 JavaThread* calling_thread = JavaThread::current();
1231
1232 EscapeBarrier eb(true, calling_thread, java_thread);
1233 if (!eb.deoptimize_objects(MaxJavaStackTraceDepth)) {
1234 return JVMTI_ERROR_OUT_OF_MEMORY;
1235 }
1236
1237 // growable array of jvmti monitors info on the C-heap
1238 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1239 new (ResourceObj::C_HEAP, mtServiceability) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, mtServiceability);
1240
1241 // It is only safe to perform the direct operation on the current
1242 // thread. All other usage needs to use a direct handshake for safety.
1243 if (java_thread == calling_thread) {
1244 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1245 } else {
1246 // get owned monitors info with handshake
1247 GetOwnedMonitorInfoClosure op(calling_thread, this, owned_monitors_list);
1248 Handshake::execute(&op, java_thread);
1249 err = op.result();
1250 }
1251
1252 jint owned_monitor_count = owned_monitors_list->length();
1253 if (err == JVMTI_ERROR_NONE) {
1254 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1255 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1256 // copy to output array.
1257 for (int i = 0; i < owned_monitor_count; i++) {
1258 (*monitor_info_ptr)[i].monitor =
1259 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1260 (*monitor_info_ptr)[i].stack_depth =
1261 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1262 }
1263 }
1264 *monitor_info_count_ptr = owned_monitor_count;
1265 }
1266
1267 // clean up.
1268 for (int i = 0; i < owned_monitor_count; i++) {
1269 deallocate((unsigned char*)owned_monitors_list->at(i));
1270 }
1271 delete owned_monitors_list;
1272
1273 return err;
1274 } /* end GetOwnedMonitorStackDepthInfo */
1275
1276
1277 // java_thread - protected by ThreadsListHandle and pre-checked
1278 // monitor_ptr - pre-checked for NULL
1279 jvmtiError
1280 JvmtiEnv::GetCurrentContendedMonitor(JavaThread* java_thread, jobject* monitor_ptr) {
1281 jvmtiError err = JVMTI_ERROR_NONE;
1282 JavaThread* calling_thread = JavaThread::current();
1283
1284 // It is only safe to perform the direct operation on the current
1285 // thread. All other usage needs to use a direct handshake for safety.
1286 if (java_thread == calling_thread) {
1287 err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr);
1288 } else {
1289 // get contended monitor information with handshake
1290 GetCurrentContendedMonitorClosure op(calling_thread, this, monitor_ptr);
1291 Handshake::execute(&op, java_thread);
1292 err = op.result();
1293 }
1294 return err;
1295 } /* end GetCurrentContendedMonitor */
1296
1297
1298 // thread - NOT protected by ThreadsListHandle and NOT pre-checked
1299 // proc - pre-checked for NULL
1300 // arg - NULL is a valid value, must be checked
1301 jvmtiError
1302 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1303 JavaThread* current_thread = JavaThread::current();
1304
1305 JavaThread* java_thread = NULL;
1306 oop thread_oop = NULL;
1307 ThreadsListHandle tlh(current_thread);
1308 jvmtiError err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), thread, &java_thread, &thread_oop);
1309 if (err != JVMTI_ERROR_NONE) {
1310 // We got an error code so we don't have a JavaThread *, but
1311 // only return an error from here if we didn't get a valid
1312 // thread_oop.
1313 if (thread_oop == NULL) {
1314 return err;
1315 }
1316 // We have a valid thread_oop.
1317 }
1318
1319 if (java_thread != NULL) {
1320 // 'thread' refers to an existing JavaThread.
1321 return JVMTI_ERROR_INVALID_THREAD;
1322 }
1323
1324 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1325 return JVMTI_ERROR_INVALID_PRIORITY;
1326 }
1327
1328 Handle thread_hndl(current_thread, thread_oop);
1329
1330 JvmtiAgentThread* new_thread = new JvmtiAgentThread(this, proc, arg);
1331
1332 // At this point it may be possible that no osthread was created for the
1333 // JavaThread due to lack of resources.
1334 if (new_thread->osthread() == NULL) {
1335 // The new thread is not known to Thread-SMR yet so we can just delete.
1336 delete new_thread;
1337 return JVMTI_ERROR_OUT_OF_MEMORY;
1338 }
1339
1340 JavaThread::start_internal_daemon(current_thread, new_thread, thread_hndl,
1341 (ThreadPriority)priority);
1342
1343 return JVMTI_ERROR_NONE;
1344 } /* end RunAgentThread */
1345
1346 //
1347 // Thread Group functions
1348 //
1349
1350 // group_count_ptr - pre-checked for NULL
1351 // groups_ptr - pre-checked for NULL
1352 jvmtiError
1353 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1354 JavaThread* current_thread = JavaThread::current();
1355
1356 // Only one top level thread group now.
1357 *group_count_ptr = 1;
1358
1359 // Allocate memory to store global-refs to the thread groups.
1360 // Assume this area is freed by caller.
1361 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1362
1363 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1364
1365 // Convert oop to Handle, then convert Handle to global-ref.
1366 {
1367 HandleMark hm(current_thread);
1368 Handle system_thread_group(current_thread, Universe::system_thread_group());
1369 *groups_ptr[0] = jni_reference(system_thread_group);
1370 }
1371
1372 return JVMTI_ERROR_NONE;
1373 } /* end GetTopThreadGroups */
1374
1375
1376 // info_ptr - pre-checked for NULL
1377 jvmtiError
1378 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1379 Thread* current_thread = Thread::current();
1380 ResourceMark rm(current_thread);
1381 HandleMark hm(current_thread);
1382
1383 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1384 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1385
1386 const char* name;
1387 Handle parent_group;
1388 bool is_daemon;
1389 ThreadPriority max_priority;
1390
1391 name = java_lang_ThreadGroup::name(group_obj());
1392 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1393 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj());
1394 max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1395
1396 info_ptr->is_daemon = is_daemon;
1397 info_ptr->max_priority = max_priority;
1398 info_ptr->parent = jni_reference(parent_group);
1399
1400 if (name != NULL) {
1401 info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1);
1402 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1403 strcpy(info_ptr->name, name);
1404 } else {
1405 info_ptr->name = NULL;
1406 }
1407
1408 return JVMTI_ERROR_NONE;
1409 } /* end GetThreadGroupInfo */
1410
1411
1412 // thread_count_ptr - pre-checked for NULL
1413 // threads_ptr - pre-checked for NULL
1414 // group_count_ptr - pre-checked for NULL
1415 // groups_ptr - pre-checked for NULL
1416 jvmtiError
1417 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1418 JavaThread* current_thread = JavaThread::current();
1419 oop group_obj = JNIHandles::resolve_external_guard(group);
1420 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1421
1422 Handle *thread_objs = NULL;
1423 Handle *group_objs = NULL;
1424 int nthreads = 0;
1425 int ngroups = 0;
1426 int hidden_threads = 0;
1427
1428 ResourceMark rm(current_thread);
1429 HandleMark hm(current_thread);
1430
1431 Handle group_hdl(current_thread, group_obj);
1432
1433 { // Cannot allow thread or group counts to change.
1434 ObjectLocker ol(group_hdl, current_thread);
1435
1436 nthreads = java_lang_ThreadGroup::nthreads(group_hdl());
1437 ngroups = java_lang_ThreadGroup::ngroups(group_hdl());
1438
1439 if (nthreads > 0) {
1440 ThreadsListHandle tlh(current_thread);
1441 objArrayOop threads = java_lang_ThreadGroup::threads(group_hdl());
1442 assert(nthreads <= threads->length(), "too many threads");
1443 thread_objs = NEW_RESOURCE_ARRAY(Handle,nthreads);
1444 for (int i = 0, j = 0; i < nthreads; i++) {
1445 oop thread_obj = threads->obj_at(i);
1446 assert(thread_obj != NULL, "thread_obj is NULL");
1447 JavaThread *java_thread = NULL;
1448 jvmtiError err = JvmtiExport::cv_oop_to_JavaThread(tlh.list(), thread_obj, &java_thread);
1449 if (err == JVMTI_ERROR_NONE) {
1450 // Have a valid JavaThread*.
1451 if (java_thread->is_hidden_from_external_view()) {
1452 // Filter out hidden java threads.
1453 hidden_threads++;
1454 continue;
1455 }
1456 } else {
1457 // We couldn't convert thread_obj into a JavaThread*.
1458 if (err == JVMTI_ERROR_INVALID_THREAD) {
1459 // The thread_obj does not refer to a java.lang.Thread object
1460 // so skip it.
1461 hidden_threads++;
1462 continue;
1463 }
1464 // We have a valid thread_obj, but no JavaThread*; the caller
1465 // can still have limited use for the thread_obj.
1466 }
1467 thread_objs[j++] = Handle(current_thread, thread_obj);
1468 }
1469 nthreads -= hidden_threads;
1470 } // ThreadsListHandle is destroyed here.
1471
1472 if (ngroups > 0) {
1473 objArrayOop groups = java_lang_ThreadGroup::groups(group_hdl());
1474 assert(ngroups <= groups->length(), "too many groups");
1475 group_objs = NEW_RESOURCE_ARRAY(Handle,ngroups);
1476 for (int i = 0; i < ngroups; i++) {
1477 oop group_obj = groups->obj_at(i);
1478 assert(group_obj != NULL, "group_obj != NULL");
1479 group_objs[i] = Handle(current_thread, group_obj);
1480 }
1481 }
1482 } // ThreadGroup unlocked here
1483
1484 *group_count_ptr = ngroups;
1485 *thread_count_ptr = nthreads;
1486 *threads_ptr = new_jthreadArray(nthreads, thread_objs);
1487 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs);
1488 if ((nthreads > 0) && (*threads_ptr == NULL)) {
1489 return JVMTI_ERROR_OUT_OF_MEMORY;
1490 }
1491 if ((ngroups > 0) && (*groups_ptr == NULL)) {
1492 return JVMTI_ERROR_OUT_OF_MEMORY;
1493 }
1494
1495 return JVMTI_ERROR_NONE;
1496 } /* end GetThreadGroupChildren */
1497
1498
1499 //
1500 // Stack Frame functions
1501 //
1502
1503 // java_thread - protected by ThreadsListHandle and pre-checked
1504 // max_frame_count - pre-checked to be greater than or equal to 0
1505 // frame_buffer - pre-checked for NULL
1506 // count_ptr - pre-checked for NULL
1507 jvmtiError
1508 JvmtiEnv::GetStackTrace(JavaThread* java_thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1509 jvmtiError err = JVMTI_ERROR_NONE;
1510
1511 // It is only safe to perform the direct operation on the current
1512 // thread. All other usage needs to use a direct handshake for safety.
1513 if (java_thread == JavaThread::current()) {
1514 err = get_stack_trace(java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1515 } else {
1516 // Get stack trace with handshake.
1517 GetStackTraceClosure op(this, start_depth, max_frame_count, frame_buffer, count_ptr);
1518 Handshake::execute(&op, java_thread);
1519 err = op.result();
1520 }
1521
1522 return err;
1523 } /* end GetStackTrace */
1524
1525
1526 // max_frame_count - pre-checked to be greater than or equal to 0
1527 // stack_info_ptr - pre-checked for NULL
1528 // thread_count_ptr - pre-checked for NULL
1529 jvmtiError
1530 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1531 jvmtiError err = JVMTI_ERROR_NONE;
1532 JavaThread* calling_thread = JavaThread::current();
1533
1534 // JVMTI get stack traces at safepoint.
1535 VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1536 VMThread::execute(&op);
1537 *thread_count_ptr = op.final_thread_count();
1538 *stack_info_ptr = op.stack_info();
1539 err = op.result();
1540 return err;
1541 } /* end GetAllStackTraces */
1542
1543
1544 // thread_count - pre-checked to be greater than or equal to 0
1545 // thread_list - pre-checked for NULL
1546 // max_frame_count - pre-checked to be greater than or equal to 0
1547 // stack_info_ptr - pre-checked for NULL
1548 jvmtiError
1549 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1550 jvmtiError err = JVMTI_ERROR_NONE;
1551
1552 if (thread_count == 1) {
1553 // Use direct handshake if we need to get only one stack trace.
1554 JavaThread *current_thread = JavaThread::current();
1555 ThreadsListHandle tlh(current_thread);
1556 JavaThread *java_thread;
1557 err = JvmtiExport::cv_external_thread_to_JavaThread(tlh.list(), *thread_list, &java_thread, NULL);
1558 if (err != JVMTI_ERROR_NONE) {
1559 return err;
1560 }
1561
1562 GetSingleStackTraceClosure op(this, current_thread, *thread_list, max_frame_count);
1563 Handshake::execute(&op, &tlh, java_thread);
1564 err = op.result();
1565 if (err == JVMTI_ERROR_NONE) {
1566 *stack_info_ptr = op.stack_info();
1567 }
1568 } else {
1569 // JVMTI get stack traces at safepoint.
1570 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1571 VMThread::execute(&op);
1572 err = op.result();
1573 if (err == JVMTI_ERROR_NONE) {
1574 *stack_info_ptr = op.stack_info();
1575 }
1576 }
1577 return err;
1578 } /* end GetThreadListStackTraces */
1579
1580
1581 // java_thread - protected by ThreadsListHandle and pre-checked
1582 // count_ptr - pre-checked for NULL
1583 jvmtiError
1584 JvmtiEnv::GetFrameCount(JavaThread* java_thread, jint* count_ptr) {
1585 jvmtiError err = JVMTI_ERROR_NONE;
1586
1587 // retrieve or create JvmtiThreadState.
1588 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1589 if (state == NULL) {
1590 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1591 }
1592
1593 // It is only safe to perform the direct operation on the current
1594 // thread. All other usage needs to use a direct handshake for safety.
1595 if (java_thread == JavaThread::current()) {
1596 err = get_frame_count(state, count_ptr);
1597 } else {
1598 // get java stack frame count with handshake.
1599 GetFrameCountClosure op(this, state, count_ptr);
1600 Handshake::execute(&op, java_thread);
1601 err = op.result();
1602 }
1603 return err;
1604 } /* end GetFrameCount */
1605
1606
1607 // java_thread - protected by ThreadsListHandle and pre-checked
1608 jvmtiError
1609 JvmtiEnv::PopFrame(JavaThread* java_thread) {
1610 // retrieve or create the state
1611 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1612 if (state == NULL) {
1613 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1614 }
1615
1616 // Eagerly reallocate scalar replaced objects.
1617 JavaThread* current_thread = JavaThread::current();
1618 EscapeBarrier eb(true, current_thread, java_thread);
1619 if (!eb.deoptimize_objects(1)) {
1620 // Reallocation of scalar replaced objects failed -> return with error
1621 return JVMTI_ERROR_OUT_OF_MEMORY;
1622 }
1623
1624 MutexLocker mu(JvmtiThreadState_lock);
1625 UpdateForPopTopFrameClosure op(state);
1626 if (java_thread == current_thread) {
1627 op.doit(java_thread, true /* self */);
1628 } else {
1629 Handshake::execute(&op, java_thread);
1630 }
1631 return op.result();
1632 } /* end PopFrame */
1633
1634
1635 // java_thread - protected by ThreadsListHandle and pre-checked
1636 // depth - pre-checked as non-negative
1637 // method_ptr - pre-checked for NULL
1638 // location_ptr - pre-checked for NULL
1639 jvmtiError
1640 JvmtiEnv::GetFrameLocation(JavaThread* java_thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1641 jvmtiError err = JVMTI_ERROR_NONE;
1642
1643 // It is only safe to perform the direct operation on the current
1644 // thread. All other usage needs to use a direct handshake for safety.
1645 if (java_thread == JavaThread::current()) {
1646 err = get_frame_location(java_thread, depth, method_ptr, location_ptr);
1647 } else {
1648 // JVMTI get java stack frame location via direct handshake.
1649 GetFrameLocationClosure op(this, depth, method_ptr, location_ptr);
1650 Handshake::execute(&op, java_thread);
1651 err = op.result();
1652 }
1653 return err;
1654 } /* end GetFrameLocation */
1655
1656
1657 // java_thread - protected by ThreadsListHandle and pre-checked
1658 // depth - pre-checked as non-negative
1659 jvmtiError
1660 JvmtiEnv::NotifyFramePop(JavaThread* java_thread, jint depth) {
1661 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread);
1662 if (state == NULL) {
1663 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1664 }
1665
1666 SetFramePopClosure op(this, state, depth);
1667 MutexLocker mu(JvmtiThreadState_lock);
1668 if (java_thread == JavaThread::current()) {
1669 op.doit(java_thread, true /* self */);
1670 } else {
1671 Handshake::execute(&op, java_thread);
1672 }
1673 return op.result();
1674 } /* end NotifyFramePop */
1675
1676
1677 //
1678 // Force Early Return functions
1679 //
1680
1681 // java_thread - protected by ThreadsListHandle and pre-checked
1682 jvmtiError
1683 JvmtiEnv::ForceEarlyReturnObject(JavaThread* java_thread, jobject value) {
1684 jvalue val;
1685 val.l = value;
1686 return force_early_return(java_thread, val, atos);
1687 } /* end ForceEarlyReturnObject */
1688
1689
1690 // java_thread - protected by ThreadsListHandle and pre-checked
1691 jvmtiError
1692 JvmtiEnv::ForceEarlyReturnInt(JavaThread* java_thread, jint value) {
1693 jvalue val;
1694 val.i = value;
1695 return force_early_return(java_thread, val, itos);
1696 } /* end ForceEarlyReturnInt */
1697
1698
1699 // java_thread - protected by ThreadsListHandle and pre-checked
1700 jvmtiError
1701 JvmtiEnv::ForceEarlyReturnLong(JavaThread* java_thread, jlong value) {
1702 jvalue val;
1703 val.j = value;
1704 return force_early_return(java_thread, val, ltos);
1705 } /* end ForceEarlyReturnLong */
1706
1707
1708 // java_thread - protected by ThreadsListHandle and pre-checked
1709 jvmtiError
1710 JvmtiEnv::ForceEarlyReturnFloat(JavaThread* java_thread, jfloat value) {
1711 jvalue val;
1712 val.f = value;
1713 return force_early_return(java_thread, val, ftos);
1714 } /* end ForceEarlyReturnFloat */
1715
1716
1717 // java_thread - protected by ThreadsListHandle and pre-checked
1718 jvmtiError
1719 JvmtiEnv::ForceEarlyReturnDouble(JavaThread* java_thread, jdouble value) {
1720 jvalue val;
1721 val.d = value;
1722 return force_early_return(java_thread, val, dtos);
1723 } /* end ForceEarlyReturnDouble */
1724
1725
1726 // java_thread - protected by ThreadsListHandle and pre-checked
1727 jvmtiError
1728 JvmtiEnv::ForceEarlyReturnVoid(JavaThread* java_thread) {
1729 jvalue val;
1730 val.j = 0L;
1731 return force_early_return(java_thread, val, vtos);
1732 } /* end ForceEarlyReturnVoid */
1733
1734
1735 //
1736 // Heap functions
1737 //
1738
1739 // klass - NULL is a valid value, must be checked
1740 // initial_object - NULL is a valid value, must be checked
1741 // callbacks - pre-checked for NULL
1742 // user_data - NULL is a valid value, must be checked
1743 jvmtiError
1744 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1745 // check klass if provided
1746 Klass* k = NULL;
1747 if (klass != NULL) {
1748 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1749 if (k_mirror == NULL) {
1750 return JVMTI_ERROR_INVALID_CLASS;
1751 }
1752 if (java_lang_Class::is_primitive(k_mirror)) {
1753 return JVMTI_ERROR_NONE;
1754 }
1755 k = java_lang_Class::as_Klass(k_mirror);
1756 if (klass == NULL) {
1757 return JVMTI_ERROR_INVALID_CLASS;
1758 }
1759 }
1760
1761 if (initial_object != NULL) {
1762 oop init_obj = JNIHandles::resolve_external_guard(initial_object);
1763 if (init_obj == NULL) {
1764 return JVMTI_ERROR_INVALID_OBJECT;
1765 }
1766 }
1767
1768 Thread *thread = Thread::current();
1769 HandleMark hm(thread);
1770
1771 TraceTime t("FollowReferences", TRACETIME_LOG(Debug, jvmti, objecttagging));
1772 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, k, initial_object, callbacks, user_data);
1773 return JVMTI_ERROR_NONE;
1774 } /* end FollowReferences */
1775
1776
1777 // klass - NULL is a valid value, must be checked
1778 // callbacks - pre-checked for NULL
1779 // user_data - NULL is a valid value, must be checked
1780 jvmtiError
1781 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1782 // check klass if provided
1783 Klass* k = NULL;
1784 if (klass != NULL) {
1785 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1786 if (k_mirror == NULL) {
1787 return JVMTI_ERROR_INVALID_CLASS;
1788 }
1789 if (java_lang_Class::is_primitive(k_mirror)) {
1790 return JVMTI_ERROR_NONE;
1791 }
1792 k = java_lang_Class::as_Klass(k_mirror);
1793 if (k == NULL) {
1794 return JVMTI_ERROR_INVALID_CLASS;
1795 }
1796 }
1797
1798 TraceTime t("IterateThroughHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
1799 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, k, callbacks, user_data);
1800 return JVMTI_ERROR_NONE;
1801 } /* end IterateThroughHeap */
1802
1803
1804 // tag_ptr - pre-checked for NULL
1805 jvmtiError
1806 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
1807 oop o = JNIHandles::resolve_external_guard(object);
1808 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1809 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
1810 return JVMTI_ERROR_NONE;
1811 } /* end GetTag */
1812
1813
1814 jvmtiError
1815 JvmtiEnv::SetTag(jobject object, jlong tag) {
1816 oop o = JNIHandles::resolve_external_guard(object);
1817 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1818 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
1819 return JVMTI_ERROR_NONE;
1820 } /* end SetTag */
1821
1822
1823 // tag_count - pre-checked to be greater than or equal to 0
1824 // tags - pre-checked for NULL
1825 // count_ptr - pre-checked for NULL
1826 // object_result_ptr - NULL is a valid value, must be checked
1827 // tag_result_ptr - NULL is a valid value, must be checked
1828 jvmtiError
1829 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
1830 TraceTime t("GetObjectsWithTags", TRACETIME_LOG(Debug, jvmti, objecttagging));
1831 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
1832 } /* end GetObjectsWithTags */
1833
1834
1835 jvmtiError
1836 JvmtiEnv::ForceGarbageCollection() {
1837 Universe::heap()->collect(GCCause::_jvmti_force_gc);
1838 return JVMTI_ERROR_NONE;
1839 } /* end ForceGarbageCollection */
1840
1841
1842 //
1843 // Heap (1.0) functions
1844 //
1845
1846 // object_reference_callback - pre-checked for NULL
1847 // user_data - NULL is a valid value, must be checked
1848 jvmtiError
1849 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
1850 oop o = JNIHandles::resolve_external_guard(object);
1851 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1852 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
1853 return JVMTI_ERROR_NONE;
1854 } /* end IterateOverObjectsReachableFromObject */
1855
1856
1857 // heap_root_callback - NULL is a valid value, must be checked
1858 // stack_ref_callback - NULL is a valid value, must be checked
1859 // object_ref_callback - NULL is a valid value, must be checked
1860 // user_data - NULL is a valid value, must be checked
1861 jvmtiError
1862 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
1863 TraceTime t("IterateOverReachableObjects", TRACETIME_LOG(Debug, jvmti, objecttagging));
1864 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
1865 return JVMTI_ERROR_NONE;
1866 } /* end IterateOverReachableObjects */
1867
1868
1869 // heap_object_callback - pre-checked for NULL
1870 // user_data - NULL is a valid value, must be checked
1871 jvmtiError
1872 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
1873 TraceTime t("IterateOverHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
1874 Thread *thread = Thread::current();
1875 HandleMark hm(thread);
1876 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, NULL, heap_object_callback, user_data);
1877 return JVMTI_ERROR_NONE;
1878 } /* end IterateOverHeap */
1879
1880
1881 // k_mirror - may be primitive, this must be checked
1882 // heap_object_callback - pre-checked for NULL
1883 // user_data - NULL is a valid value, must be checked
1884 jvmtiError
1885 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
1886 if (java_lang_Class::is_primitive(k_mirror)) {
1887 // DO PRIMITIVE CLASS PROCESSING
1888 return JVMTI_ERROR_NONE;
1889 }
1890 Klass* klass = java_lang_Class::as_Klass(k_mirror);
1891 if (klass == NULL) {
1892 return JVMTI_ERROR_INVALID_CLASS;
1893 }
1894 TraceTime t("IterateOverInstancesOfClass", TRACETIME_LOG(Debug, jvmti, objecttagging));
1895 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
1896 return JVMTI_ERROR_NONE;
1897 } /* end IterateOverInstancesOfClass */
1898
1899
1900 //
1901 // Local Variable functions
1902 //
1903
1904 // java_thread - protected by ThreadsListHandle and pre-checked
1905 // depth - pre-checked as non-negative
1906 // value_ptr - pre-checked for NULL
1907 jvmtiError
1908 JvmtiEnv::GetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject* value_ptr) {
1909 JavaThread* current_thread = JavaThread::current();
1910 // rm object is created to clean up the javaVFrame created in
1911 // doit_prologue(), but after doit() is finished with it.
1912 ResourceMark rm(current_thread);
1913
1914 VM_GetOrSetLocal op(java_thread, current_thread, depth, slot);
1915 VMThread::execute(&op);
1916 jvmtiError err = op.result();
1917 if (err != JVMTI_ERROR_NONE) {
1918 return err;
1919 } else {
1920 *value_ptr = op.value().l;
1921 return JVMTI_ERROR_NONE;
1922 }
1923 } /* end GetLocalObject */
1924
1925 // java_thread - protected by ThreadsListHandle and pre-checked
1926 // depth - pre-checked as non-negative
1927 // value - pre-checked for NULL
1928 jvmtiError
1929 JvmtiEnv::GetLocalInstance(JavaThread* java_thread, jint depth, jobject* value_ptr){
1930 JavaThread* current_thread = JavaThread::current();
1931 // rm object is created to clean up the javaVFrame created in
1932 // doit_prologue(), but after doit() is finished with it.
1933 ResourceMark rm(current_thread);
1934
1935 VM_GetReceiver op(java_thread, current_thread, depth);
1936 VMThread::execute(&op);
1937 jvmtiError err = op.result();
1938 if (err != JVMTI_ERROR_NONE) {
1939 return err;
1940 } else {
1941 *value_ptr = op.value().l;
1942 return JVMTI_ERROR_NONE;
1943 }
1944 } /* end GetLocalInstance */
1945
1946
1947 // java_thread - protected by ThreadsListHandle and pre-checked
1948 // depth - pre-checked as non-negative
1949 // value_ptr - pre-checked for NULL
1950 jvmtiError
1951 JvmtiEnv::GetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint* value_ptr) {
1952 // rm object is created to clean up the javaVFrame created in
1953 // doit_prologue(), but after doit() is finished with it.
1954 ResourceMark rm;
1955
1956 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT);
1957 VMThread::execute(&op);
1958 *value_ptr = op.value().i;
1959 return op.result();
1960 } /* end GetLocalInt */
1961
1962
1963 // java_thread - protected by ThreadsListHandle and pre-checked
1964 // depth - pre-checked as non-negative
1965 // value_ptr - pre-checked for NULL
1966 jvmtiError
1967 JvmtiEnv::GetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong* value_ptr) {
1968 // rm object is created to clean up the javaVFrame created in
1969 // doit_prologue(), but after doit() is finished with it.
1970 ResourceMark rm;
1971
1972 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG);
1973 VMThread::execute(&op);
1974 *value_ptr = op.value().j;
1975 return op.result();
1976 } /* end GetLocalLong */
1977
1978
1979 // java_thread - protected by ThreadsListHandle and pre-checked
1980 // depth - pre-checked as non-negative
1981 // value_ptr - pre-checked for NULL
1982 jvmtiError
1983 JvmtiEnv::GetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat* value_ptr) {
1984 // rm object is created to clean up the javaVFrame created in
1985 // doit_prologue(), but after doit() is finished with it.
1986 ResourceMark rm;
1987
1988 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT);
1989 VMThread::execute(&op);
1990 *value_ptr = op.value().f;
1991 return op.result();
1992 } /* end GetLocalFloat */
1993
1994
1995 // java_thread - protected by ThreadsListHandle and pre-checked
1996 // depth - pre-checked as non-negative
1997 // value_ptr - pre-checked for NULL
1998 jvmtiError
1999 JvmtiEnv::GetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble* value_ptr) {
2000 // rm object is created to clean up the javaVFrame created in
2001 // doit_prologue(), but after doit() is finished with it.
2002 ResourceMark rm;
2003
2004 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE);
2005 VMThread::execute(&op);
2006 *value_ptr = op.value().d;
2007 return op.result();
2008 } /* end GetLocalDouble */
2009
2010
2011 // java_thread - protected by ThreadsListHandle and pre-checked
2012 // depth - pre-checked as non-negative
2013 jvmtiError
2014 JvmtiEnv::SetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject value) {
2015 // rm object is created to clean up the javaVFrame created in
2016 // doit_prologue(), but after doit() is finished with it.
2017 ResourceMark rm;
2018 jvalue val;
2019 val.l = value;
2020 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val);
2021 VMThread::execute(&op);
2022 return op.result();
2023 } /* end SetLocalObject */
2024
2025
2026 // java_thread - protected by ThreadsListHandle and pre-checked
2027 // depth - pre-checked as non-negative
2028 jvmtiError
2029 JvmtiEnv::SetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint value) {
2030 // rm object is created to clean up the javaVFrame created in
2031 // doit_prologue(), but after doit() is finished with it.
2032 ResourceMark rm;
2033 jvalue val;
2034 val.i = value;
2035 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val);
2036 VMThread::execute(&op);
2037 return op.result();
2038 } /* end SetLocalInt */
2039
2040
2041 // java_thread - protected by ThreadsListHandle and pre-checked
2042 // depth - pre-checked as non-negative
2043 jvmtiError
2044 JvmtiEnv::SetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong value) {
2045 // rm object is created to clean up the javaVFrame created in
2046 // doit_prologue(), but after doit() is finished with it.
2047 ResourceMark rm;
2048 jvalue val;
2049 val.j = value;
2050 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val);
2051 VMThread::execute(&op);
2052 return op.result();
2053 } /* end SetLocalLong */
2054
2055
2056 // java_thread - protected by ThreadsListHandle and pre-checked
2057 // depth - pre-checked as non-negative
2058 jvmtiError
2059 JvmtiEnv::SetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat value) {
2060 // rm object is created to clean up the javaVFrame created in
2061 // doit_prologue(), but after doit() is finished with it.
2062 ResourceMark rm;
2063 jvalue val;
2064 val.f = value;
2065 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val);
2066 VMThread::execute(&op);
2067 return op.result();
2068 } /* end SetLocalFloat */
2069
2070
2071 // java_thread - protected by ThreadsListHandle and pre-checked
2072 // depth - pre-checked as non-negative
2073 jvmtiError
2074 JvmtiEnv::SetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble value) {
2075 // rm object is created to clean up the javaVFrame created in
2076 // doit_prologue(), but after doit() is finished with it.
2077 ResourceMark rm;
2078 jvalue val;
2079 val.d = value;
2080 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val);
2081 VMThread::execute(&op);
2082 return op.result();
2083 } /* end SetLocalDouble */
2084
2085
2086 //
2087 // Breakpoint functions
2088 //
2089
2090 // method - pre-checked for validity, but may be NULL meaning obsolete method
2091 jvmtiError
2092 JvmtiEnv::SetBreakpoint(Method* method, jlocation location) {
2093 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2094 if (location < 0) { // simple invalid location check first
2095 return JVMTI_ERROR_INVALID_LOCATION;
2096 }
2097 // verify that the breakpoint is not past the end of the method
2098 if (location >= (jlocation) method->code_size()) {
2099 return JVMTI_ERROR_INVALID_LOCATION;
2100 }
2101
2102 ResourceMark rm;
2103 JvmtiBreakpoint bp(method, location);
2104 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2105 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
2106 return JVMTI_ERROR_DUPLICATE;
2107
2108 if (TraceJVMTICalls) {
2109 jvmti_breakpoints.print();
2110 }
2111
2112 return JVMTI_ERROR_NONE;
2113 } /* end SetBreakpoint */
2114
2115
2116 // method - pre-checked for validity, but may be NULL meaning obsolete method
2117 jvmtiError
2118 JvmtiEnv::ClearBreakpoint(Method* method, jlocation location) {
2119 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2120
2121 if (location < 0) { // simple invalid location check first
2122 return JVMTI_ERROR_INVALID_LOCATION;
2123 }
2124
2125 // verify that the breakpoint is not past the end of the method
2126 if (location >= (jlocation) method->code_size()) {
2127 return JVMTI_ERROR_INVALID_LOCATION;
2128 }
2129
2130 JvmtiBreakpoint bp(method, location);
2131
2132 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2133 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2134 return JVMTI_ERROR_NOT_FOUND;
2135
2136 if (TraceJVMTICalls) {
2137 jvmti_breakpoints.print();
2138 }
2139
2140 return JVMTI_ERROR_NONE;
2141 } /* end ClearBreakpoint */
2142
2143
2144 //
2145 // Watched Field functions
2146 //
2147
2148 jvmtiError
2149 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2150 // make sure we haven't set this watch before
2151 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2152 fdesc_ptr->set_is_field_access_watched(true);
2153
2154 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2155
2156 return JVMTI_ERROR_NONE;
2157 } /* end SetFieldAccessWatch */
2158
2159
2160 jvmtiError
2161 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2162 // make sure we have a watch to clear
2163 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2164 fdesc_ptr->set_is_field_access_watched(false);
2165
2166 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2167
2168 return JVMTI_ERROR_NONE;
2169 } /* end ClearFieldAccessWatch */
2170
2171
2172 jvmtiError
2173 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2174 // make sure we haven't set this watch before
2175 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2176 fdesc_ptr->set_is_field_modification_watched(true);
2177
2178 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2179
2180 return JVMTI_ERROR_NONE;
2181 } /* end SetFieldModificationWatch */
2182
2183
2184 jvmtiError
2185 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2186 // make sure we have a watch to clear
2187 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2188 fdesc_ptr->set_is_field_modification_watched(false);
2189
2190 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2191
2192 return JVMTI_ERROR_NONE;
2193 } /* end ClearFieldModificationWatch */
2194
2195 //
2196 // Class functions
2197 //
2198
2199
2200 // k_mirror - may be primitive, this must be checked
2201 // signature_ptr - NULL is a valid value, must be checked
2202 // generic_ptr - NULL is a valid value, must be checked
2203 jvmtiError
2204 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2205 ResourceMark rm;
2206 bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2207 Klass* k = NULL;
2208 if (!isPrimitive) {
2209 k = java_lang_Class::as_Klass(k_mirror);
2210 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2211 }
2212 if (signature_ptr != NULL) {
2213 char* result = NULL;
2214 if (isPrimitive) {
2215 char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2216 result = (char*) jvmtiMalloc(2);
2217 result[0] = tchar;
2218 result[1] = '\0';
2219 } else {
2220 const char* class_sig = k->signature_name();
2221 result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2222 strcpy(result, class_sig);
2223 }
2224 *signature_ptr = result;
2225 }
2226 if (generic_ptr != NULL) {
2227 *generic_ptr = NULL;
2228 if (!isPrimitive && k->is_instance_klass()) {
2229 Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2230 if (soo != NULL) {
2231 const char *gen_sig = soo->as_C_string();
2232 if (gen_sig != NULL) {
2233 char* gen_result;
2234 jvmtiError err = allocate(strlen(gen_sig) + 1,
2235 (unsigned char **)&gen_result);
2236 if (err != JVMTI_ERROR_NONE) {
2237 return err;
2238 }
2239 strcpy(gen_result, gen_sig);
2240 *generic_ptr = gen_result;
2241 }
2242 }
2243 }
2244 }
2245 return JVMTI_ERROR_NONE;
2246 } /* end GetClassSignature */
2247
2248
2249 // k_mirror - may be primitive, this must be checked
2250 // status_ptr - pre-checked for NULL
2251 jvmtiError
2252 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2253 jint result = 0;
2254 if (java_lang_Class::is_primitive(k_mirror)) {
2255 result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2256 } else {
2257 Klass* k = java_lang_Class::as_Klass(k_mirror);
2258 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2259 result = k->jvmti_class_status();
2260 }
2261 *status_ptr = result;
2262
2263 return JVMTI_ERROR_NONE;
2264 } /* end GetClassStatus */
2265
2266
2267 // k_mirror - may be primitive, this must be checked
2268 // source_name_ptr - pre-checked for NULL
2269 jvmtiError
2270 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2271 if (java_lang_Class::is_primitive(k_mirror)) {
2272 return JVMTI_ERROR_ABSENT_INFORMATION;
2273 }
2274 Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2275 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2276
2277 if (!k_klass->is_instance_klass()) {
2278 return JVMTI_ERROR_ABSENT_INFORMATION;
2279 }
2280
2281 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2282 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2283 {
2284 JavaThread* current_thread = JavaThread::current();
2285 ResourceMark rm(current_thread);
2286 const char* sfncp = (const char*) sfnOop->as_C_string();
2287 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2288 strcpy(*source_name_ptr, sfncp);
2289 }
2290
2291 return JVMTI_ERROR_NONE;
2292 } /* end GetSourceFileName */
2293
2294
2295 // k_mirror - may be primitive, this must be checked
2296 // modifiers_ptr - pre-checked for NULL
2297 jvmtiError
2298 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2299 JavaThread* current_thread = JavaThread::current();
2300 jint result = 0;
2301 if (!java_lang_Class::is_primitive(k_mirror)) {
2302 Klass* k = java_lang_Class::as_Klass(k_mirror);
2303 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2304 result = k->compute_modifier_flags();
2305
2306 // Reset the deleted ACC_SUPER bit (deleted in compute_modifier_flags()).
2307 if (k->is_super()) {
2308 result |= JVM_ACC_SUPER;
2309 }
2310 } else {
2311 result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
2312 }
2313 *modifiers_ptr = result;
2314
2315 return JVMTI_ERROR_NONE;
2316 } /* end GetClassModifiers */
2317
2318
2319 // k_mirror - may be primitive, this must be checked
2320 // method_count_ptr - pre-checked for NULL
2321 // methods_ptr - pre-checked for NULL
2322 jvmtiError
2323 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2324 JavaThread* current_thread = JavaThread::current();
2325 HandleMark hm(current_thread);
2326
2327 if (java_lang_Class::is_primitive(k_mirror)) {
2328 *method_count_ptr = 0;
2329 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2330 return JVMTI_ERROR_NONE;
2331 }
2332 Klass* k = java_lang_Class::as_Klass(k_mirror);
2333 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2334
2335 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2336 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2337 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2338 }
2339
2340 if (!k->is_instance_klass()) {
2341 *method_count_ptr = 0;
2342 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2343 return JVMTI_ERROR_NONE;
2344 }
2345 InstanceKlass* ik = InstanceKlass::cast(k);
2346 // Allocate the result and fill it in
2347 int result_length = ik->methods()->length();
2348 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2349 int index;
2350 bool jmethodids_found = true;
2351 int skipped = 0; // skip overpass methods
2352
2353 for (index = 0; index < result_length; index++) {
2354 Method* m = ik->methods()->at(index);
2355 // Depending on can_maintain_original_method_order capability use the original
2356 // method ordering indices stored in the class, so we can emit jmethodIDs in
2357 // the order they appeared in the class file or just copy in current order.
2358 int result_index = JvmtiExport::can_maintain_original_method_order() ? ik->method_ordering()->at(index) : index;
2359 assert(result_index >= 0 && result_index < result_length, "invalid original method index");
2360 if (m->is_overpass()) {
2361 result_list[result_index] = NULL;
2362 skipped++;
2363 continue;
2364 }
2365 jmethodID id;
2366 if (jmethodids_found) {
2367 id = m->find_jmethod_id_or_null();
2368 if (id == NULL) {
2369 // If we find an uninitialized value, make sure there is
2370 // enough space for all the uninitialized values we might
2371 // find.
2372 ik->ensure_space_for_methodids(index);
2373 jmethodids_found = false;
2374 id = m->jmethod_id();
2375 }
2376 } else {
2377 id = m->jmethod_id();
2378 }
2379 result_list[result_index] = id;
2380 }
2381
2382 // Fill in return value.
2383 if (skipped > 0) {
2384 // copy results skipping NULL methodIDs
2385 *methods_ptr = (jmethodID*)jvmtiMalloc((result_length - skipped) * sizeof(jmethodID));
2386 *method_count_ptr = result_length - skipped;
2387 for (index = 0, skipped = 0; index < result_length; index++) {
2388 if (result_list[index] == NULL) {
2389 skipped++;
2390 } else {
2391 (*methods_ptr)[index - skipped] = result_list[index];
2392 }
2393 }
2394 deallocate((unsigned char *)result_list);
2395 } else {
2396 *method_count_ptr = result_length;
2397 *methods_ptr = result_list;
2398 }
2399
2400 return JVMTI_ERROR_NONE;
2401 } /* end GetClassMethods */
2402
2403
2404 // k_mirror - may be primitive, this must be checked
2405 // field_count_ptr - pre-checked for NULL
2406 // fields_ptr - pre-checked for NULL
2407 jvmtiError
2408 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2409 if (java_lang_Class::is_primitive(k_mirror)) {
2410 *field_count_ptr = 0;
2411 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2412 return JVMTI_ERROR_NONE;
2413 }
2414 JavaThread* current_thread = JavaThread::current();
2415 HandleMark hm(current_thread);
2416 Klass* k = java_lang_Class::as_Klass(k_mirror);
2417 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2418
2419 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2420 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2421 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2422 }
2423
2424 if (!k->is_instance_klass()) {
2425 *field_count_ptr = 0;
2426 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2427 return JVMTI_ERROR_NONE;
2428 }
2429
2430
2431 InstanceKlass* ik = InstanceKlass::cast(k);
2432
2433 int result_count = 0;
2434 // First, count the fields.
2435 FilteredFieldStream flds(ik, true, true);
2436 result_count = flds.field_count();
2437
2438 // Allocate the result and fill it in
2439 jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID));
2440 // The JVMTI spec requires fields in the order they occur in the class file,
2441 // this is the reverse order of what FieldStream hands out.
2442 int id_index = (result_count - 1);
2443
2444 for (FilteredFieldStream src_st(ik, true, true); !src_st.eos(); src_st.next()) {
2445 result_list[id_index--] = jfieldIDWorkaround::to_jfieldID(
2446 ik, src_st.offset(),
2447 src_st.access_flags().is_static(),
2448 src_st.field_descriptor().is_inlined());
2449 }
2450 assert(id_index == -1, "just checking");
2451 // Fill in the results
2452 *field_count_ptr = result_count;
2453 *fields_ptr = result_list;
2454
2455 return JVMTI_ERROR_NONE;
2456 } /* end GetClassFields */
2457
2458
2459 // k_mirror - may be primitive, this must be checked
2460 // interface_count_ptr - pre-checked for NULL
2461 // interfaces_ptr - pre-checked for NULL
2462 jvmtiError
2463 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
2464 {
2465 if (java_lang_Class::is_primitive(k_mirror)) {
2466 *interface_count_ptr = 0;
2467 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2468 return JVMTI_ERROR_NONE;
2469 }
2470 JavaThread* current_thread = JavaThread::current();
2471 HandleMark hm(current_thread);
2472 Klass* k = java_lang_Class::as_Klass(k_mirror);
2473 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2474
2475 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2476 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
2477 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2478
2479 if (!k->is_instance_klass()) {
2480 *interface_count_ptr = 0;
2481 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2482 return JVMTI_ERROR_NONE;
2483 }
2484
2485 InstanceKlass* ik = InstanceKlass::cast(k);
2486 Array<InstanceKlass*>* interface_list = ik->local_interfaces();
2487 int result_length = (interface_list == NULL ? 0 : interface_list->length());
2488 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
2489 for (int i_index = 0; i_index < result_length; i_index += 1) {
2490 InstanceKlass* klass_at = interface_list->at(i_index);
2491 assert(klass_at->is_klass(), "interfaces must be Klass*s");
2492 assert(klass_at->is_interface(), "interfaces must be interfaces");
2493 oop mirror_at = klass_at->java_mirror();
2494 Handle handle_at = Handle(current_thread, mirror_at);
2495 result_list[i_index] = (jclass) jni_reference(handle_at);
2496 }
2497 *interface_count_ptr = result_length;
2498 *interfaces_ptr = result_list;
2499 }
2500
2501 return JVMTI_ERROR_NONE;
2502 } /* end GetImplementedInterfaces */
2503
2504
2505 // k_mirror - may be primitive, this must be checked
2506 // minor_version_ptr - pre-checked for NULL
2507 // major_version_ptr - pre-checked for NULL
2508 jvmtiError
2509 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
2510 if (java_lang_Class::is_primitive(k_mirror)) {
2511 return JVMTI_ERROR_ABSENT_INFORMATION;
2512 }
2513 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2514
2515 jint status = klass->jvmti_class_status();
2516 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2517 return JVMTI_ERROR_INVALID_CLASS;
2518 }
2519 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2520 return JVMTI_ERROR_ABSENT_INFORMATION;
2521 }
2522
2523 InstanceKlass* ik = InstanceKlass::cast(klass);
2524 *minor_version_ptr = ik->minor_version();
2525 *major_version_ptr = ik->major_version();
2526
2527 return JVMTI_ERROR_NONE;
2528 } /* end GetClassVersionNumbers */
2529
2530
2531 // k_mirror - may be primitive, this must be checked
2532 // constant_pool_count_ptr - pre-checked for NULL
2533 // constant_pool_byte_count_ptr - pre-checked for NULL
2534 // constant_pool_bytes_ptr - pre-checked for NULL
2535 jvmtiError
2536 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
2537 if (java_lang_Class::is_primitive(k_mirror)) {
2538 return JVMTI_ERROR_ABSENT_INFORMATION;
2539 }
2540
2541 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2542 Thread *thread = Thread::current();
2543 ResourceMark rm(thread);
2544
2545 jint status = klass->jvmti_class_status();
2546 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2547 return JVMTI_ERROR_INVALID_CLASS;
2548 }
2549 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2550 return JVMTI_ERROR_ABSENT_INFORMATION;
2551 }
2552
2553 InstanceKlass* ik = InstanceKlass::cast(klass);
2554 JvmtiConstantPoolReconstituter reconstituter(ik);
2555 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2556 return reconstituter.get_error();
2557 }
2558
2559 unsigned char *cpool_bytes;
2560 int cpool_size = reconstituter.cpool_size();
2561 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2562 return reconstituter.get_error();
2563 }
2564 jvmtiError res = allocate(cpool_size, &cpool_bytes);
2565 if (res != JVMTI_ERROR_NONE) {
2566 return res;
2567 }
2568 reconstituter.copy_cpool_bytes(cpool_bytes);
2569 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2570 return reconstituter.get_error();
2571 }
2572
2573 constantPoolHandle constants(thread, ik->constants());
2574 *constant_pool_count_ptr = constants->length();
2575 *constant_pool_byte_count_ptr = cpool_size;
2576 *constant_pool_bytes_ptr = cpool_bytes;
2577
2578 return JVMTI_ERROR_NONE;
2579 } /* end GetConstantPool */
2580
2581
2582 // k_mirror - may be primitive, this must be checked
2583 // is_interface_ptr - pre-checked for NULL
2584 jvmtiError
2585 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
2586 {
2587 bool result = false;
2588 if (!java_lang_Class::is_primitive(k_mirror)) {
2589 Klass* k = java_lang_Class::as_Klass(k_mirror);
2590 if (k != NULL && k->is_interface()) {
2591 result = true;
2592 }
2593 }
2594 *is_interface_ptr = result;
2595 }
2596
2597 return JVMTI_ERROR_NONE;
2598 } /* end IsInterface */
2599
2600
2601 // k_mirror - may be primitive, this must be checked
2602 // is_array_class_ptr - pre-checked for NULL
2603 jvmtiError
2604 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
2605 {
2606 bool result = false;
2607 if (!java_lang_Class::is_primitive(k_mirror)) {
2608 Klass* k = java_lang_Class::as_Klass(k_mirror);
2609 if (k != NULL && k->is_array_klass()) {
2610 result = true;
2611 }
2612 }
2613 *is_array_class_ptr = result;
2614 }
2615
2616 return JVMTI_ERROR_NONE;
2617 } /* end IsArrayClass */
2618
2619
2620 // k_mirror - may be primitive, this must be checked
2621 // classloader_ptr - pre-checked for NULL
2622 jvmtiError
2623 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
2624 {
2625 if (java_lang_Class::is_primitive(k_mirror)) {
2626 *classloader_ptr = (jclass) jni_reference(Handle());
2627 return JVMTI_ERROR_NONE;
2628 }
2629 JavaThread* current_thread = JavaThread::current();
2630 HandleMark hm(current_thread);
2631 Klass* k = java_lang_Class::as_Klass(k_mirror);
2632 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2633
2634 oop result_oop = k->class_loader();
2635 if (result_oop == NULL) {
2636 *classloader_ptr = (jclass) jni_reference(Handle());
2637 return JVMTI_ERROR_NONE;
2638 }
2639 Handle result_handle = Handle(current_thread, result_oop);
2640 jclass result_jnihandle = (jclass) jni_reference(result_handle);
2641 *classloader_ptr = result_jnihandle;
2642 }
2643 return JVMTI_ERROR_NONE;
2644 } /* end GetClassLoader */
2645
2646
2647 // k_mirror - may be primitive, this must be checked
2648 // source_debug_extension_ptr - pre-checked for NULL
2649 jvmtiError
2650 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
2651 {
2652 if (java_lang_Class::is_primitive(k_mirror)) {
2653 return JVMTI_ERROR_ABSENT_INFORMATION;
2654 }
2655 Klass* k = java_lang_Class::as_Klass(k_mirror);
2656 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2657 if (!k->is_instance_klass()) {
2658 return JVMTI_ERROR_ABSENT_INFORMATION;
2659 }
2660 const char* sde = InstanceKlass::cast(k)->source_debug_extension();
2661 NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
2662
2663 {
2664 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
2665 strcpy(*source_debug_extension_ptr, sde);
2666 }
2667 }
2668
2669 return JVMTI_ERROR_NONE;
2670 } /* end GetSourceDebugExtension */
2671
2672 //
2673 // Object functions
2674 //
2675
2676 // hash_code_ptr - pre-checked for NULL
2677 jvmtiError
2678 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
2679 oop mirror = JNIHandles::resolve_external_guard(object);
2680 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
2681 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
2682
2683 {
2684 jint result = (jint) mirror->identity_hash();
2685 *hash_code_ptr = result;
2686 }
2687 return JVMTI_ERROR_NONE;
2688 } /* end GetObjectHashCode */
2689
2690
2691 // info_ptr - pre-checked for NULL
2692 jvmtiError
2693 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
2694 // This needs to be performed at a safepoint to gather stable data
2695 // because monitor owner / waiters might not be suspended.
2696 VM_GetObjectMonitorUsage op(this, JavaThread::current(), object, info_ptr);
2697 VMThread::execute(&op);
2698 return op.result();
2699 } /* end GetObjectMonitorUsage */
2700
2701
2702 //
2703 // Field functions
2704 //
2705
2706 // name_ptr - NULL is a valid value, must be checked
2707 // signature_ptr - NULL is a valid value, must be checked
2708 // generic_ptr - NULL is a valid value, must be checked
2709 jvmtiError
2710 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
2711 JavaThread* current_thread = JavaThread::current();
2712 ResourceMark rm(current_thread);
2713 if (name_ptr == NULL) {
2714 // just don't return the name
2715 } else {
2716 const char* fieldName = fdesc_ptr->name()->as_C_string();
2717 *name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1);
2718 if (*name_ptr == NULL)
2719 return JVMTI_ERROR_OUT_OF_MEMORY;
2720 strcpy(*name_ptr, fieldName);
2721 }
2722 if (signature_ptr== NULL) {
2723 // just don't return the signature
2724 } else {
2725 const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
2726 *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
2727 if (*signature_ptr == NULL)
2728 return JVMTI_ERROR_OUT_OF_MEMORY;
2729 strcpy(*signature_ptr, fieldSignature);
2730 }
2731 if (generic_ptr != NULL) {
2732 *generic_ptr = NULL;
2733 Symbol* soop = fdesc_ptr->generic_signature();
2734 if (soop != NULL) {
2735 const char* gen_sig = soop->as_C_string();
2736 if (gen_sig != NULL) {
2737 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
2738 if (err != JVMTI_ERROR_NONE) {
2739 return err;
2740 }
2741 strcpy(*generic_ptr, gen_sig);
2742 }
2743 }
2744 }
2745 return JVMTI_ERROR_NONE;
2746 } /* end GetFieldName */
2747
2748
2749 // declaring_class_ptr - pre-checked for NULL
2750 jvmtiError
2751 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
2752
2753 *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
2754 return JVMTI_ERROR_NONE;
2755 } /* end GetFieldDeclaringClass */
2756
2757
2758 // modifiers_ptr - pre-checked for NULL
2759 jvmtiError
2760 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
2761
2762 AccessFlags resultFlags = fdesc_ptr->access_flags();
2763 jint result = resultFlags.as_int();
2764 *modifiers_ptr = result;
2765
2766 return JVMTI_ERROR_NONE;
2767 } /* end GetFieldModifiers */
2768
2769
2770 // is_synthetic_ptr - pre-checked for NULL
2771 jvmtiError
2772 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
2773 *is_synthetic_ptr = fdesc_ptr->is_synthetic();
2774 return JVMTI_ERROR_NONE;
2775 } /* end IsFieldSynthetic */
2776
2777
2778 //
2779 // Method functions
2780 //
2781
2782 // method - pre-checked for validity, but may be NULL meaning obsolete method
2783 // name_ptr - NULL is a valid value, must be checked
2784 // signature_ptr - NULL is a valid value, must be checked
2785 // generic_ptr - NULL is a valid value, must be checked
2786 jvmtiError
2787 JvmtiEnv::GetMethodName(Method* method, char** name_ptr, char** signature_ptr, char** generic_ptr) {
2788 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2789 JavaThread* current_thread = JavaThread::current();
2790
2791 ResourceMark rm(current_thread); // get the utf8 name and signature
2792 if (name_ptr == NULL) {
2793 // just don't return the name
2794 } else {
2795 const char* utf8_name = (const char *) method->name()->as_utf8();
2796 *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
2797 strcpy(*name_ptr, utf8_name);
2798 }
2799 if (signature_ptr == NULL) {
2800 // just don't return the signature
2801 } else {
2802 const char* utf8_signature = (const char *) method->signature()->as_utf8();
2803 *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
2804 strcpy(*signature_ptr, utf8_signature);
2805 }
2806
2807 if (generic_ptr != NULL) {
2808 *generic_ptr = NULL;
2809 Symbol* soop = method->generic_signature();
2810 if (soop != NULL) {
2811 const char* gen_sig = soop->as_C_string();
2812 if (gen_sig != NULL) {
2813 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
2814 if (err != JVMTI_ERROR_NONE) {
2815 return err;
2816 }
2817 strcpy(*generic_ptr, gen_sig);
2818 }
2819 }
2820 }
2821 return JVMTI_ERROR_NONE;
2822 } /* end GetMethodName */
2823
2824
2825 // method - pre-checked for validity, but may be NULL meaning obsolete method
2826 // declaring_class_ptr - pre-checked for NULL
2827 jvmtiError
2828 JvmtiEnv::GetMethodDeclaringClass(Method* method, jclass* declaring_class_ptr) {
2829 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2830 (*declaring_class_ptr) = get_jni_class_non_null(method->method_holder());
2831 return JVMTI_ERROR_NONE;
2832 } /* end GetMethodDeclaringClass */
2833
2834
2835 // method - pre-checked for validity, but may be NULL meaning obsolete method
2836 // modifiers_ptr - pre-checked for NULL
2837 jvmtiError
2838 JvmtiEnv::GetMethodModifiers(Method* method, jint* modifiers_ptr) {
2839 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2840 (*modifiers_ptr) = method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2841 return JVMTI_ERROR_NONE;
2842 } /* end GetMethodModifiers */
2843
2844
2845 // method - pre-checked for validity, but may be NULL meaning obsolete method
2846 // max_ptr - pre-checked for NULL
2847 jvmtiError
2848 JvmtiEnv::GetMaxLocals(Method* method, jint* max_ptr) {
2849 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2850 // get max stack
2851 (*max_ptr) = method->max_locals();
2852 return JVMTI_ERROR_NONE;
2853 } /* end GetMaxLocals */
2854
2855
2856 // method - pre-checked for validity, but may be NULL meaning obsolete method
2857 // size_ptr - pre-checked for NULL
2858 jvmtiError
2859 JvmtiEnv::GetArgumentsSize(Method* method, jint* size_ptr) {
2860 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2861 // get size of arguments
2862
2863 (*size_ptr) = method->size_of_parameters();
2864 return JVMTI_ERROR_NONE;
2865 } /* end GetArgumentsSize */
2866
2867
2868 // method - pre-checked for validity, but may be NULL meaning obsolete method
2869 // entry_count_ptr - pre-checked for NULL
2870 // table_ptr - pre-checked for NULL
2871 jvmtiError
2872 JvmtiEnv::GetLineNumberTable(Method* method, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
2873 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2874 if (!method->has_linenumber_table()) {
2875 return (JVMTI_ERROR_ABSENT_INFORMATION);
2876 }
2877
2878 // The line number table is compressed so we don't know how big it is until decompressed.
2879 // Decompression is really fast so we just do it twice.
2880
2881 // Compute size of table
2882 jint num_entries = 0;
2883 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
2884 while (stream.read_pair()) {
2885 num_entries++;
2886 }
2887 jvmtiLineNumberEntry *jvmti_table =
2888 (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
2889
2890 // Fill jvmti table
2891 if (num_entries > 0) {
2892 int index = 0;
2893 CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
2894 while (stream.read_pair()) {
2895 jvmti_table[index].start_location = (jlocation) stream.bci();
2896 jvmti_table[index].line_number = (jint) stream.line();
2897 index++;
2898 }
2899 assert(index == num_entries, "sanity check");
2900 }
2901
2902 // Set up results
2903 (*entry_count_ptr) = num_entries;
2904 (*table_ptr) = jvmti_table;
2905
2906 return JVMTI_ERROR_NONE;
2907 } /* end GetLineNumberTable */
2908
2909
2910 // method - pre-checked for validity, but may be NULL meaning obsolete method
2911 // start_location_ptr - pre-checked for NULL
2912 // end_location_ptr - pre-checked for NULL
2913 jvmtiError
2914 JvmtiEnv::GetMethodLocation(Method* method, jlocation* start_location_ptr, jlocation* end_location_ptr) {
2915
2916 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2917 // get start and end location
2918 (*end_location_ptr) = (jlocation) (method->code_size() - 1);
2919 if (method->code_size() == 0) {
2920 // there is no code so there is no start location
2921 (*start_location_ptr) = (jlocation)(-1);
2922 } else {
2923 (*start_location_ptr) = (jlocation)(0);
2924 }
2925
2926 return JVMTI_ERROR_NONE;
2927 } /* end GetMethodLocation */
2928
2929
2930 // method - pre-checked for validity, but may be NULL meaning obsolete method
2931 // entry_count_ptr - pre-checked for NULL
2932 // table_ptr - pre-checked for NULL
2933 jvmtiError
2934 JvmtiEnv::GetLocalVariableTable(Method* method, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
2935
2936 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
2937 JavaThread* current_thread = JavaThread::current();
2938
2939 // does the klass have any local variable information?
2940 InstanceKlass* ik = method->method_holder();
2941 if (!ik->access_flags().has_localvariable_table()) {
2942 return (JVMTI_ERROR_ABSENT_INFORMATION);
2943 }
2944
2945 ConstantPool* constants = method->constants();
2946 NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
2947
2948 // in the vm localvariable table representation, 6 consecutive elements in the table
2949 // represent a 6-tuple of shorts
2950 // [start_pc, length, name_index, descriptor_index, signature_index, index]
2951 jint num_entries = method->localvariable_table_length();
2952 jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
2953 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
2954
2955 if (num_entries > 0) {
2956 LocalVariableTableElement* table = method->localvariable_table_start();
2957 for (int i = 0; i < num_entries; i++) {
2958 // get the 5 tuple information from the vm table
2959 jlocation start_location = (jlocation) table[i].start_bci;
2960 jint length = (jint) table[i].length;
2961 int name_index = (int) table[i].name_cp_index;
2962 int signature_index = (int) table[i].descriptor_cp_index;
2963 int generic_signature_index = (int) table[i].signature_cp_index;
2964 jint slot = (jint) table[i].slot;
2965
2966 // get utf8 name and signature
2967 char *name_buf = NULL;
2968 char *sig_buf = NULL;
2969 char *gen_sig_buf = NULL;
2970 {
2971 ResourceMark rm(current_thread);
2972
2973 const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
2974 name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
2975 strcpy(name_buf, utf8_name);
2976
2977 const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
2978 sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
2979 strcpy(sig_buf, utf8_signature);
2980
2981 if (generic_signature_index > 0) {
2982 const char *utf8_gen_sign = (const char *)
2983 constants->symbol_at(generic_signature_index)->as_utf8();
2984 gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
2985 strcpy(gen_sig_buf, utf8_gen_sign);
2986 }
2987 }
2988
2989 // fill in the jvmti local variable table
2990 jvmti_table[i].start_location = start_location;
2991 jvmti_table[i].length = length;
2992 jvmti_table[i].name = name_buf;
2993 jvmti_table[i].signature = sig_buf;
2994 jvmti_table[i].generic_signature = gen_sig_buf;
2995 jvmti_table[i].slot = slot;
2996 }
2997 }
2998
2999 // set results
3000 (*entry_count_ptr) = num_entries;
3001 (*table_ptr) = jvmti_table;
3002
3003 return JVMTI_ERROR_NONE;
3004 } /* end GetLocalVariableTable */
3005
3006
3007 // method - pre-checked for validity, but may be NULL meaning obsolete method
3008 // bytecode_count_ptr - pre-checked for NULL
3009 // bytecodes_ptr - pre-checked for NULL
3010 jvmtiError
3011 JvmtiEnv::GetBytecodes(Method* method, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
3012 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3013
3014 methodHandle mh(Thread::current(), method);
3015 jint size = (jint)mh->code_size();
3016 jvmtiError err = allocate(size, bytecodes_ptr);
3017 if (err != JVMTI_ERROR_NONE) {
3018 return err;
3019 }
3020
3021 (*bytecode_count_ptr) = size;
3022 // get byte codes
3023 JvmtiClassFileReconstituter::copy_bytecodes(mh, *bytecodes_ptr);
3024
3025 return JVMTI_ERROR_NONE;
3026 } /* end GetBytecodes */
3027
3028
3029 // method - pre-checked for validity, but may be NULL meaning obsolete method
3030 // is_native_ptr - pre-checked for NULL
3031 jvmtiError
3032 JvmtiEnv::IsMethodNative(Method* method, jboolean* is_native_ptr) {
3033 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3034 (*is_native_ptr) = method->is_native();
3035 return JVMTI_ERROR_NONE;
3036 } /* end IsMethodNative */
3037
3038
3039 // method - pre-checked for validity, but may be NULL meaning obsolete method
3040 // is_synthetic_ptr - pre-checked for NULL
3041 jvmtiError
3042 JvmtiEnv::IsMethodSynthetic(Method* method, jboolean* is_synthetic_ptr) {
3043 NULL_CHECK(method, JVMTI_ERROR_INVALID_METHODID);
3044 (*is_synthetic_ptr) = method->is_synthetic();
3045 return JVMTI_ERROR_NONE;
3046 } /* end IsMethodSynthetic */
3047
3048
3049 // method - pre-checked for validity, but may be NULL meaning obsolete method
3050 // is_obsolete_ptr - pre-checked for NULL
3051 jvmtiError
3052 JvmtiEnv::IsMethodObsolete(Method* method, jboolean* is_obsolete_ptr) {
3053 if (use_version_1_0_semantics() &&
3054 get_capabilities()->can_redefine_classes == 0) {
3055 // This JvmtiEnv requested version 1.0 semantics and this function
3056 // requires the can_redefine_classes capability in version 1.0 so
3057 // we need to return an error here.
3058 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3059 }
3060
3061 if (method == NULL || method->is_obsolete()) {
3062 *is_obsolete_ptr = true;
3063 } else {
3064 *is_obsolete_ptr = false;
3065 }
3066 return JVMTI_ERROR_NONE;
3067 } /* end IsMethodObsolete */
3068
3069 //
3070 // Raw Monitor functions
3071 //
3072
3073 // name - pre-checked for NULL
3074 // monitor_ptr - pre-checked for NULL
3075 jvmtiError
3076 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
3077 JvmtiRawMonitor* rmonitor = new JvmtiRawMonitor(name);
3078 NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
3079
3080 *monitor_ptr = (jrawMonitorID)rmonitor;
3081
3082 return JVMTI_ERROR_NONE;
3083 } /* end CreateRawMonitor */
3084
3085
3086 // rmonitor - pre-checked for validity
3087 jvmtiError
3088 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
3089 if (Threads::number_of_threads() == 0) {
3090 // Remove this monitor from pending raw monitors list
3091 // if it has entered in onload or start phase.
3092 JvmtiPendingMonitors::destroy(rmonitor);
3093 } else {
3094 Thread* thread = Thread::current();
3095 if (rmonitor->owner() == thread) {
3096 // The caller owns this monitor which we are about to destroy.
3097 // We exit the underlying synchronization object so that the
3098 // "delete monitor" call below can work without an assertion
3099 // failure on systems that don't like destroying synchronization
3100 // objects that are locked.
3101 int r;
3102 int recursion = rmonitor->recursions();
3103 for (int i = 0; i <= recursion; i++) {
3104 r = rmonitor->raw_exit(thread);
3105 assert(r == JvmtiRawMonitor::M_OK, "raw_exit should have worked");
3106 if (r != JvmtiRawMonitor::M_OK) { // robustness
3107 return JVMTI_ERROR_INTERNAL;
3108 }
3109 }
3110 }
3111 if (rmonitor->owner() != NULL) {
3112 // The caller is trying to destroy a monitor that is locked by
3113 // someone else. While this is not forbidden by the JVMTI
3114 // spec, it will cause an assertion failure on systems that don't
3115 // like destroying synchronization objects that are locked.
3116 // We indicate a problem with the error return (and leak the
3117 // monitor's memory).
3118 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3119 }
3120 }
3121
3122 delete rmonitor;
3123
3124 return JVMTI_ERROR_NONE;
3125 } /* end DestroyRawMonitor */
3126
3127
3128 // rmonitor - pre-checked for validity
3129 jvmtiError
3130 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
3131 if (Threads::number_of_threads() == 0) {
3132 // No JavaThreads exist so JvmtiRawMonitor enter cannot be
3133 // used, add this raw monitor to the pending list.
3134 // The pending monitors will be actually entered when
3135 // the VM is setup.
3136 // See transition_pending_raw_monitors in create_vm()
3137 // in thread.cpp.
3138 JvmtiPendingMonitors::enter(rmonitor);
3139 } else {
3140 Thread* thread = Thread::current();
3141 // 8266889: raw_enter changes Java thread state, needs WXWrite
3142 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3143 rmonitor->raw_enter(thread);
3144 }
3145 return JVMTI_ERROR_NONE;
3146 } /* end RawMonitorEnter */
3147
3148
3149 // rmonitor - pre-checked for validity
3150 jvmtiError
3151 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
3152 jvmtiError err = JVMTI_ERROR_NONE;
3153
3154 if (Threads::number_of_threads() == 0) {
3155 // No JavaThreads exist so just remove this monitor from the pending list.
3156 // Bool value from exit is false if rmonitor is not in the list.
3157 if (!JvmtiPendingMonitors::exit(rmonitor)) {
3158 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3159 }
3160 } else {
3161 Thread* thread = Thread::current();
3162 int r = rmonitor->raw_exit(thread);
3163 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3164 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3165 }
3166 }
3167 return err;
3168 } /* end RawMonitorExit */
3169
3170
3171 // rmonitor - pre-checked for validity
3172 jvmtiError
3173 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
3174 Thread* thread = Thread::current();
3175 // 8266889: raw_wait changes Java thread state, needs WXWrite
3176 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, thread));
3177 int r = rmonitor->raw_wait(millis, thread);
3178
3179 switch (r) {
3180 case JvmtiRawMonitor::M_INTERRUPTED:
3181 return JVMTI_ERROR_INTERRUPT;
3182 case JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE:
3183 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3184 default:
3185 return JVMTI_ERROR_NONE;
3186 }
3187 } /* end RawMonitorWait */
3188
3189
3190 // rmonitor - pre-checked for validity
3191 jvmtiError
3192 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
3193 Thread* thread = Thread::current();
3194 int r = rmonitor->raw_notify(thread);
3195
3196 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3197 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3198 }
3199 return JVMTI_ERROR_NONE;
3200 } /* end RawMonitorNotify */
3201
3202
3203 // rmonitor - pre-checked for validity
3204 jvmtiError
3205 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
3206 Thread* thread = Thread::current();
3207 int r = rmonitor->raw_notifyAll(thread);
3208
3209 if (r == JvmtiRawMonitor::M_ILLEGAL_MONITOR_STATE) {
3210 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3211 }
3212 return JVMTI_ERROR_NONE;
3213 } /* end RawMonitorNotifyAll */
3214
3215
3216 //
3217 // JNI Function Interception functions
3218 //
3219
3220
3221 // function_table - pre-checked for NULL
3222 jvmtiError
3223 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
3224 // Copy jni function table at safepoint.
3225 VM_JNIFunctionTableCopier copier(function_table);
3226 VMThread::execute(&copier);
3227
3228 return JVMTI_ERROR_NONE;
3229 } /* end SetJNIFunctionTable */
3230
3231
3232 // function_table - pre-checked for NULL
3233 jvmtiError
3234 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
3235 *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
3236 if (*function_table == NULL)
3237 return JVMTI_ERROR_OUT_OF_MEMORY;
3238 memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
3239 return JVMTI_ERROR_NONE;
3240 } /* end GetJNIFunctionTable */
3241
3242
3243 //
3244 // Event Management functions
3245 //
3246
3247 jvmtiError
3248 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
3249 // can only generate two event types
3250 if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
3251 event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
3252 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3253 }
3254
3255 // for compiled_method_load events we must check that the environment
3256 // has the can_generate_compiled_method_load_events capability.
3257 if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
3258 if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
3259 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3260 }
3261 return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
3262 } else {
3263 return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
3264 }
3265
3266 } /* end GenerateEvents */
3267
3268
3269 //
3270 // Extension Mechanism functions
3271 //
3272
3273 // extension_count_ptr - pre-checked for NULL
3274 // extensions - pre-checked for NULL
3275 jvmtiError
3276 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
3277 return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
3278 } /* end GetExtensionFunctions */
3279
3280
3281 // extension_count_ptr - pre-checked for NULL
3282 // extensions - pre-checked for NULL
3283 jvmtiError
3284 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
3285 return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
3286 } /* end GetExtensionEvents */
3287
3288
3289 // callback - NULL is a valid value, must be checked
3290 jvmtiError
3291 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
3292 return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
3293 } /* end SetExtensionEventCallback */
3294
3295 //
3296 // Timers functions
3297 //
3298
3299 // info_ptr - pre-checked for NULL
3300 jvmtiError
3301 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3302 os::current_thread_cpu_time_info(info_ptr);
3303 return JVMTI_ERROR_NONE;
3304 } /* end GetCurrentThreadCpuTimerInfo */
3305
3306
3307 // nanos_ptr - pre-checked for NULL
3308 jvmtiError
3309 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
3310 *nanos_ptr = os::current_thread_cpu_time();
3311 return JVMTI_ERROR_NONE;
3312 } /* end GetCurrentThreadCpuTime */
3313
3314
3315 // info_ptr - pre-checked for NULL
3316 jvmtiError
3317 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3318 os::thread_cpu_time_info(info_ptr);
3319 return JVMTI_ERROR_NONE;
3320 } /* end GetThreadCpuTimerInfo */
3321
3322
3323 // java_thread - protected by ThreadsListHandle and pre-checked
3324 // nanos_ptr - pre-checked for NULL
3325 jvmtiError
3326 JvmtiEnv::GetThreadCpuTime(JavaThread* java_thread, jlong* nanos_ptr) {
3327 *nanos_ptr = os::thread_cpu_time(java_thread);
3328 return JVMTI_ERROR_NONE;
3329 } /* end GetThreadCpuTime */
3330
3331
3332 // info_ptr - pre-checked for NULL
3333 jvmtiError
3334 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
3335 os::javaTimeNanos_info(info_ptr);
3336 return JVMTI_ERROR_NONE;
3337 } /* end GetTimerInfo */
3338
3339
3340 // nanos_ptr - pre-checked for NULL
3341 jvmtiError
3342 JvmtiEnv::GetTime(jlong* nanos_ptr) {
3343 *nanos_ptr = os::javaTimeNanos();
3344 return JVMTI_ERROR_NONE;
3345 } /* end GetTime */
3346
3347
3348 // processor_count_ptr - pre-checked for NULL
3349 jvmtiError
3350 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
3351 *processor_count_ptr = os::active_processor_count();
3352 return JVMTI_ERROR_NONE;
3353 } /* end GetAvailableProcessors */
3354
3355 jvmtiError
3356 JvmtiEnv::SetHeapSamplingInterval(jint sampling_interval) {
3357 if (sampling_interval < 0) {
3358 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3359 }
3360 ThreadHeapSampler::set_sampling_interval(sampling_interval);
3361 return JVMTI_ERROR_NONE;
3362 } /* end SetHeapSamplingInterval */
3363
3364 //
3365 // System Properties functions
3366 //
3367
3368 // count_ptr - pre-checked for NULL
3369 // property_ptr - pre-checked for NULL
3370 jvmtiError
3371 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
3372 jvmtiError err = JVMTI_ERROR_NONE;
3373
3374 // Get the number of readable properties.
3375 *count_ptr = Arguments::PropertyList_readable_count(Arguments::system_properties());
3376
3377 // Allocate memory to hold the exact number of readable properties.
3378 err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
3379 if (err != JVMTI_ERROR_NONE) {
3380 return err;
3381 }
3382 int readable_count = 0;
3383 // Loop through the system properties until all the readable properties are found.
3384 for (SystemProperty* p = Arguments::system_properties(); p != NULL && readable_count < *count_ptr; p = p->next()) {
3385 if (p->is_readable()) {
3386 const char *key = p->key();
3387 char **tmp_value = *property_ptr+readable_count;
3388 readable_count++;
3389 err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
3390 if (err == JVMTI_ERROR_NONE) {
3391 strcpy(*tmp_value, key);
3392 } else {
3393 // clean up previously allocated memory.
3394 for (int j = 0; j < readable_count; j++) {
3395 Deallocate((unsigned char*)*property_ptr+j);
3396 }
3397 Deallocate((unsigned char*)property_ptr);
3398 break;
3399 }
3400 }
3401 }
3402 assert(err != JVMTI_ERROR_NONE || readable_count == *count_ptr, "Bad readable property count");
3403 return err;
3404 } /* end GetSystemProperties */
3405
3406
3407 // property - pre-checked for NULL
3408 // value_ptr - pre-checked for NULL
3409 jvmtiError
3410 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
3411 jvmtiError err = JVMTI_ERROR_NONE;
3412 const char *value;
3413
3414 // Return JVMTI_ERROR_NOT_AVAILABLE if property is not readable or doesn't exist.
3415 value = Arguments::PropertyList_get_readable_value(Arguments::system_properties(), property);
3416 if (value == NULL) {
3417 err = JVMTI_ERROR_NOT_AVAILABLE;
3418 } else {
3419 err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
3420 if (err == JVMTI_ERROR_NONE) {
3421 strcpy(*value_ptr, value);
3422 }
3423 }
3424 return err;
3425 } /* end GetSystemProperty */
3426
3427
3428 // property - pre-checked for NULL
3429 // value - NULL is a valid value, must be checked
3430 jvmtiError
3431 JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) {
3432 jvmtiError err =JVMTI_ERROR_NOT_AVAILABLE;
3433
3434 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
3435 if (strcmp(property, p->key()) == 0) {
3436 if (p->set_writeable_value(value_ptr)) {
3437 err = JVMTI_ERROR_NONE;
3438 }
3439 }
3440 }
3441 return err;
3442 } /* end SetSystemProperty */