1 /*
2 * Copyright (c) 2003, 2019, 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/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "interpreter/bytecodeStream.hpp"
30 #include "interpreter/interpreter.hpp"
31 #include "jvmtifiles/jvmtiEnv.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "memory/universe.inline.hpp"
34 #include "oops/instanceKlass.hpp"
35 #include "prims/jniCheck.hpp"
36 #include "prims/jvm_misc.hpp"
37 #include "prims/jvmtiAgentThread.hpp"
38 #include "prims/jvmtiClassFileReconstituter.hpp"
39 #include "prims/jvmtiCodeBlobEvents.hpp"
40 #include "prims/jvmtiExtensions.hpp"
41 #include "prims/jvmtiGetLoadedClasses.hpp"
42 #include "prims/jvmtiImpl.hpp"
43 #include "prims/jvmtiManageCapabilities.hpp"
44 #include "prims/jvmtiRawMonitor.hpp"
45 #include "prims/jvmtiRedefineClasses.hpp"
46 #include "prims/jvmtiTagMap.hpp"
47 #include "prims/jvmtiThreadState.inline.hpp"
48 #include "prims/jvmtiUtil.hpp"
49 #include "runtime/arguments.hpp"
50 #include "runtime/deoptimization.hpp"
51 #include "runtime/interfaceSupport.hpp"
52 #include "runtime/javaCalls.hpp"
53 #include "runtime/jfieldIDWorkaround.hpp"
54 #include "runtime/osThread.hpp"
55 #include "runtime/reflectionUtils.hpp"
56 #include "runtime/signature.hpp"
57 #include "runtime/thread.inline.hpp"
58 #include "runtime/vframe.hpp"
59 #include "runtime/vmThread.hpp"
60 #include "services/threadService.hpp"
61 #include "utilities/exceptions.hpp"
62 #include "utilities/preserveException.hpp"
63
64
65 #define FIXLATER 0 // REMOVE this when completed.
66
67 // FIXLATER: hook into JvmtiTrace
68 #define TraceJVMTICalls false
69
70 JvmtiEnv::JvmtiEnv(jint version) : JvmtiEnvBase(version) {
71 }
72
73 JvmtiEnv::~JvmtiEnv() {
74 }
75
76 JvmtiEnv*
77 JvmtiEnv::create_a_jvmti(jint version) {
78 return new JvmtiEnv(version);
79 }
80
81 // VM operation class to copy jni function table at safepoint.
82 // More than one java threads or jvmti agents may be reading/
83 // modifying jni function tables. To reduce the risk of bad
84 // interaction b/w these threads it is copied at safepoint.
85 class VM_JNIFunctionTableCopier : public VM_Operation {
86 private:
87 const struct JNINativeInterface_ *_function_table;
88 public:
89 VM_JNIFunctionTableCopier(const struct JNINativeInterface_ *func_tbl) {
90 _function_table = func_tbl;
91 };
92
93 VMOp_Type type() const { return VMOp_JNIFunctionTableCopier; }
94 void doit() {
95 copy_jni_function_table(_function_table);
96 };
97 };
98
99 //
100 // Do not change the "prefix" marker below, everything above it is copied
101 // unchanged into the filled stub, everything below is controlled by the
102 // stub filler (only method bodies are carried forward, and then only for
103 // functionality still in the spec).
104 //
105 // end file prefix
106
107 //
108 // Memory Management functions
109 //
110
111 // mem_ptr - pre-checked for NULL
112 jvmtiError
113 JvmtiEnv::Allocate(jlong size, unsigned char** mem_ptr) {
114 return allocate(size, mem_ptr);
115 } /* end Allocate */
116
117
118 // mem - NULL is a valid value, must be checked
119 jvmtiError
120 JvmtiEnv::Deallocate(unsigned char* mem) {
121 return deallocate(mem);
122 } /* end Deallocate */
123
124 // Threads_lock NOT held, java_thread not protected by lock
125 // java_thread - pre-checked
126 // data - NULL is a valid value, must be checked
127 jvmtiError
128 JvmtiEnv::SetThreadLocalStorage(JavaThread* java_thread, const void* data) {
129 JvmtiThreadState* state = java_thread->jvmti_thread_state();
130 if (state == NULL) {
131 if (data == NULL) {
132 // leaving state unset same as data set to NULL
133 return JVMTI_ERROR_NONE;
134 }
135 // otherwise, create the state
136 state = JvmtiThreadState::state_for(java_thread);
137 if (state == NULL) {
138 return JVMTI_ERROR_THREAD_NOT_ALIVE;
139 }
140 }
141 state->env_thread_state(this)->set_agent_thread_local_storage_data((void*)data);
142 return JVMTI_ERROR_NONE;
143 } /* end SetThreadLocalStorage */
144
145
146 // Threads_lock NOT held
147 // thread - NOT pre-checked
148 // data_ptr - pre-checked for NULL
149 jvmtiError
150 JvmtiEnv::GetThreadLocalStorage(jthread thread, void** data_ptr) {
151 JavaThread* current_thread = JavaThread::current();
152 if (thread == NULL) {
153 JvmtiThreadState* state = current_thread->jvmti_thread_state();
154 *data_ptr = (state == NULL) ? NULL :
155 state->env_thread_state(this)->get_agent_thread_local_storage_data();
156 } else {
157
158 // jvmti_GetThreadLocalStorage is "in native" and doesn't transition
159 // the thread to _thread_in_vm. However, when the TLS for a thread
160 // other than the current thread is required we need to transition
161 // from native so as to resolve the jthread.
162
163 ThreadInVMfromNative __tiv(current_thread);
164 VM_ENTRY_BASE(jvmtiError, JvmtiEnv::GetThreadLocalStorage , current_thread)
165 debug_only(VMNativeEntryWrapper __vew;)
166
167 oop thread_oop = JNIHandles::resolve_external_guard(thread);
168 if (thread_oop == NULL) {
169 return JVMTI_ERROR_INVALID_THREAD;
170 }
171 if (!thread_oop->is_a(SystemDictionary::Thread_klass())) {
172 return JVMTI_ERROR_INVALID_THREAD;
173 }
174 JavaThread* java_thread = java_lang_Thread::thread(thread_oop);
175 if (java_thread == NULL) {
176 return JVMTI_ERROR_THREAD_NOT_ALIVE;
177 }
178 JvmtiThreadState* state = java_thread->jvmti_thread_state();
179 *data_ptr = (state == NULL) ? NULL :
180 state->env_thread_state(this)->get_agent_thread_local_storage_data();
181 }
182 return JVMTI_ERROR_NONE;
183 } /* end GetThreadLocalStorage */
184
185 //
186 // Class functions
187 //
188
189 // class_count_ptr - pre-checked for NULL
190 // classes_ptr - pre-checked for NULL
191 jvmtiError
192 JvmtiEnv::GetLoadedClasses(jint* class_count_ptr, jclass** classes_ptr) {
193 return JvmtiGetLoadedClasses::getLoadedClasses(this, class_count_ptr, classes_ptr);
194 } /* end GetLoadedClasses */
195
196
197 // initiating_loader - NULL is a valid value, must be checked
198 // class_count_ptr - pre-checked for NULL
199 // classes_ptr - pre-checked for NULL
200 jvmtiError
201 JvmtiEnv::GetClassLoaderClasses(jobject initiating_loader, jint* class_count_ptr, jclass** classes_ptr) {
202 return JvmtiGetLoadedClasses::getClassLoaderClasses(this, initiating_loader,
203 class_count_ptr, classes_ptr);
204 } /* end GetClassLoaderClasses */
205
206 // k_mirror - may be primitive, this must be checked
207 // is_modifiable_class_ptr - pre-checked for NULL
208 jvmtiError
209 JvmtiEnv::IsModifiableClass(oop k_mirror, jboolean* is_modifiable_class_ptr) {
210 *is_modifiable_class_ptr = VM_RedefineClasses::is_modifiable_class(k_mirror)?
211 JNI_TRUE : JNI_FALSE;
212 return JVMTI_ERROR_NONE;
213 } /* end IsModifiableClass */
214
215 // class_count - pre-checked to be greater than or equal to 0
216 // classes - pre-checked for NULL
217 jvmtiError
218 JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
219 //TODO: add locking
220
221 int index;
222 JavaThread* current_thread = JavaThread::current();
223 ResourceMark rm(current_thread);
224
225 jvmtiClassDefinition* class_definitions =
226 NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count);
227 NULL_CHECK(class_definitions, JVMTI_ERROR_OUT_OF_MEMORY);
228
229 for (index = 0; index < class_count; index++) {
230 HandleMark hm(current_thread);
231
232 jclass jcls = classes[index];
233 oop k_mirror = JNIHandles::resolve_external_guard(jcls);
234 if (k_mirror == NULL) {
235 return JVMTI_ERROR_INVALID_CLASS;
236 }
237 if (!k_mirror->is_a(SystemDictionary::Class_klass())) {
238 return JVMTI_ERROR_INVALID_CLASS;
239 }
240
241 if (java_lang_Class::is_primitive(k_mirror)) {
242 return JVMTI_ERROR_UNMODIFIABLE_CLASS;
243 }
244
245 Klass* k_oop = java_lang_Class::as_Klass(k_mirror);
246 KlassHandle klass(current_thread, k_oop);
247
248 jint status = klass->jvmti_class_status();
249 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
250 return JVMTI_ERROR_INVALID_CLASS;
251 }
252 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
253 return JVMTI_ERROR_UNMODIFIABLE_CLASS;
254 }
255
256 instanceKlassHandle ikh(current_thread, k_oop);
257 if (ikh->get_cached_class_file_bytes() == NULL) {
258 // Not cached, we need to reconstitute the class file from the
259 // VM representation. We don't attach the reconstituted class
260 // bytes to the InstanceKlass here because they have not been
261 // validated and we're not at a safepoint.
262 constantPoolHandle constants(current_thread, ikh->constants());
263 MonitorLockerEx ml(constants->lock()); // lock constant pool while we query it
264
265 JvmtiClassFileReconstituter reconstituter(ikh);
266 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
267 return reconstituter.get_error();
268 }
269
270 class_definitions[index].class_byte_count = (jint)reconstituter.class_file_size();
271 class_definitions[index].class_bytes = (unsigned char*)
272 reconstituter.class_file_bytes();
273 } else {
274 // it is cached, get it from the cache
275 class_definitions[index].class_byte_count = ikh->get_cached_class_file_len();
276 class_definitions[index].class_bytes = ikh->get_cached_class_file_bytes();
277 }
278 class_definitions[index].klass = jcls;
279 }
280 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
281 VMThread::execute(&op);
282 return (op.check_error());
283 } /* end RetransformClasses */
284
285
286 // class_count - pre-checked to be greater than or equal to 0
287 // class_definitions - pre-checked for NULL
288 jvmtiError
289 JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) {
290 //TODO: add locking
291 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
292 VMThread::execute(&op);
293 return (op.check_error());
294 } /* end RedefineClasses */
295
296
297 //
298 // Object functions
299 //
300
301 // size_ptr - pre-checked for NULL
302 jvmtiError
303 JvmtiEnv::GetObjectSize(jobject object, jlong* size_ptr) {
304 oop mirror = JNIHandles::resolve_external_guard(object);
305 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
306
307 if (mirror->klass() == SystemDictionary::Class_klass() &&
308 !java_lang_Class::is_primitive(mirror)) {
309 Klass* k = java_lang_Class::as_Klass(mirror);
310 assert(k != NULL, "class for non-primitive mirror must exist");
311 *size_ptr = (jlong)k->size() * wordSize;
312 } else {
313 *size_ptr = (jlong)mirror->size() * wordSize;
314 }
315 return JVMTI_ERROR_NONE;
316 } /* end GetObjectSize */
317
318 //
319 // Method functions
320 //
321
322 // prefix - NULL is a valid value, must be checked
323 jvmtiError
324 JvmtiEnv::SetNativeMethodPrefix(const char* prefix) {
325 return prefix == NULL?
326 SetNativeMethodPrefixes(0, NULL) :
327 SetNativeMethodPrefixes(1, (char**)&prefix);
328 } /* end SetNativeMethodPrefix */
329
330
331 // prefix_count - pre-checked to be greater than or equal to 0
332 // prefixes - pre-checked for NULL
333 jvmtiError
334 JvmtiEnv::SetNativeMethodPrefixes(jint prefix_count, char** prefixes) {
335 // Have to grab JVMTI thread state lock to be sure that some thread
336 // isn't accessing the prefixes at the same time we are setting them.
337 // No locks during VM bring-up.
338 if (Threads::number_of_threads() == 0) {
339 return set_native_method_prefixes(prefix_count, prefixes);
340 } else {
341 MutexLocker mu(JvmtiThreadState_lock);
342 return set_native_method_prefixes(prefix_count, prefixes);
343 }
344 } /* end SetNativeMethodPrefixes */
345
346 //
347 // Event Management functions
348 //
349
350 // callbacks - NULL is a valid value, must be checked
351 // size_of_callbacks - pre-checked to be greater than or equal to 0
352 jvmtiError
353 JvmtiEnv::SetEventCallbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) {
354 JvmtiEventController::set_event_callbacks(this, callbacks, size_of_callbacks);
355 return JVMTI_ERROR_NONE;
356 } /* end SetEventCallbacks */
357
358
359 // event_thread - NULL is a valid value, must be checked
360 jvmtiError
361 JvmtiEnv::SetEventNotificationMode(jvmtiEventMode mode, jvmtiEvent event_type, jthread event_thread, ...) {
362 JavaThread* java_thread = NULL;
363 if (event_thread != NULL) {
364 oop thread_oop = JNIHandles::resolve_external_guard(event_thread);
365 if (thread_oop == NULL) {
366 return JVMTI_ERROR_INVALID_THREAD;
367 }
368 if (!thread_oop->is_a(SystemDictionary::Thread_klass())) {
369 return JVMTI_ERROR_INVALID_THREAD;
370 }
371 java_thread = java_lang_Thread::thread(thread_oop);
372 if (java_thread == NULL) {
373 return JVMTI_ERROR_THREAD_NOT_ALIVE;
374 }
375 }
376
377 // event_type must be valid
378 if (!JvmtiEventController::is_valid_event_type(event_type)) {
379 return JVMTI_ERROR_INVALID_EVENT_TYPE;
380 }
381
382 // global events cannot be controlled at thread level.
383 if (java_thread != NULL && JvmtiEventController::is_global_event(event_type)) {
384 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
385 }
386
387 bool enabled = (mode == JVMTI_ENABLE);
388
389 // assure that needed capabilities are present
390 if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) {
391 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
392 }
393
394 if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) {
395 record_class_file_load_hook_enabled();
396 }
397 JvmtiEventController::set_user_enabled(this, java_thread, event_type, enabled);
398
399 return JVMTI_ERROR_NONE;
400 } /* end SetEventNotificationMode */
401
402 //
403 // Capability functions
404 //
405
406 // capabilities_ptr - pre-checked for NULL
407 jvmtiError
408 JvmtiEnv::GetPotentialCapabilities(jvmtiCapabilities* capabilities_ptr) {
409 JvmtiManageCapabilities::get_potential_capabilities(get_capabilities(),
410 get_prohibited_capabilities(),
411 capabilities_ptr);
412 return JVMTI_ERROR_NONE;
413 } /* end GetPotentialCapabilities */
414
415
416 // capabilities_ptr - pre-checked for NULL
417 jvmtiError
418 JvmtiEnv::AddCapabilities(const jvmtiCapabilities* capabilities_ptr) {
419 return JvmtiManageCapabilities::add_capabilities(get_capabilities(),
420 get_prohibited_capabilities(),
421 capabilities_ptr,
422 get_capabilities());
423 } /* end AddCapabilities */
424
425
426 // capabilities_ptr - pre-checked for NULL
427 jvmtiError
428 JvmtiEnv::RelinquishCapabilities(const jvmtiCapabilities* capabilities_ptr) {
429 JvmtiManageCapabilities::relinquish_capabilities(get_capabilities(), capabilities_ptr, get_capabilities());
430 return JVMTI_ERROR_NONE;
431 } /* end RelinquishCapabilities */
432
433
434 // capabilities_ptr - pre-checked for NULL
435 jvmtiError
436 JvmtiEnv::GetCapabilities(jvmtiCapabilities* capabilities_ptr) {
437 JvmtiManageCapabilities::copy_capabilities(get_capabilities(), capabilities_ptr);
438 return JVMTI_ERROR_NONE;
439 } /* end GetCapabilities */
440
441 //
442 // Class Loader Search functions
443 //
444
445 // segment - pre-checked for NULL
446 jvmtiError
447 JvmtiEnv::AddToBootstrapClassLoaderSearch(const char* segment) {
448 jvmtiPhase phase = get_phase();
449 if (phase == JVMTI_PHASE_ONLOAD) {
450 Arguments::append_sysclasspath(segment);
451 return JVMTI_ERROR_NONE;
452 } else if (use_version_1_0_semantics()) {
453 // This JvmtiEnv requested version 1.0 semantics and this function
454 // is only allowed in the ONLOAD phase in version 1.0 so we need to
455 // return an error here.
456 return JVMTI_ERROR_WRONG_PHASE;
457 } else if (phase == JVMTI_PHASE_LIVE) {
458 // The phase is checked by the wrapper that called this function,
459 // but this thread could be racing with the thread that is
460 // terminating the VM so we check one more time.
461
462 // create the zip entry
463 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment);
464 if (zip_entry == NULL) {
465 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
466 }
467
468 // lock the loader
469 Thread* thread = Thread::current();
470 HandleMark hm;
471 Handle loader_lock = Handle(thread, SystemDictionary::system_loader_lock());
472
473 ObjectLocker ol(loader_lock, thread);
474
475 // add the jar file to the bootclasspath
476 if (TraceClassLoading) {
477 tty->print_cr("[Opened %s]", zip_entry->name());
478 }
479 ClassLoaderExt::append_boot_classpath(zip_entry);
480 return JVMTI_ERROR_NONE;
481 } else {
482 return JVMTI_ERROR_WRONG_PHASE;
483 }
484
485 } /* end AddToBootstrapClassLoaderSearch */
486
487
488 // segment - pre-checked for NULL
489 jvmtiError
490 JvmtiEnv::AddToSystemClassLoaderSearch(const char* segment) {
491 jvmtiPhase phase = get_phase();
492
493 if (phase == JVMTI_PHASE_ONLOAD) {
494 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
495 if (strcmp("java.class.path", p->key()) == 0) {
496 p->append_value(segment);
497 break;
498 }
499 }
500 return JVMTI_ERROR_NONE;
501 } else if (phase == JVMTI_PHASE_LIVE) {
502 // The phase is checked by the wrapper that called this function,
503 // but this thread could be racing with the thread that is
504 // terminating the VM so we check one more time.
505 HandleMark hm;
506
507 // create the zip entry (which will open the zip file and hence
508 // check that the segment is indeed a zip file).
509 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment);
510 if (zip_entry == NULL) {
511 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
512 }
513 delete zip_entry; // no longer needed
514
515 // lock the loader
516 Thread* THREAD = Thread::current();
517 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
518
519 ObjectLocker ol(loader, THREAD);
520
521 // need the path as java.lang.String
522 Handle path = java_lang_String::create_from_platform_dependent_str(segment, THREAD);
523 if (HAS_PENDING_EXCEPTION) {
524 CLEAR_PENDING_EXCEPTION;
525 return JVMTI_ERROR_INTERNAL;
526 }
527
528 instanceKlassHandle loader_ik(THREAD, loader->klass());
529
530 // Invoke the appendToClassPathForInstrumentation method - if the method
531 // is not found it means the loader doesn't support adding to the class path
532 // in the live phase.
533 {
534 JavaValue res(T_VOID);
535 JavaCalls::call_special(&res,
536 loader,
537 loader_ik,
538 vmSymbols::appendToClassPathForInstrumentation_name(),
539 vmSymbols::appendToClassPathForInstrumentation_signature(),
540 path,
541 THREAD);
542 if (HAS_PENDING_EXCEPTION) {
543 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
544 CLEAR_PENDING_EXCEPTION;
545
546 if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) {
547 return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED;
548 } else {
549 return JVMTI_ERROR_INTERNAL;
550 }
551 }
552 }
553
554 return JVMTI_ERROR_NONE;
555 } else {
556 return JVMTI_ERROR_WRONG_PHASE;
557 }
558 } /* end AddToSystemClassLoaderSearch */
559
560 //
561 // General functions
562 //
563
564 // phase_ptr - pre-checked for NULL
565 jvmtiError
566 JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) {
567 *phase_ptr = get_phase();
568 return JVMTI_ERROR_NONE;
569 } /* end GetPhase */
570
571
572 jvmtiError
573 JvmtiEnv::DisposeEnvironment() {
574 dispose();
575 return JVMTI_ERROR_NONE;
576 } /* end DisposeEnvironment */
577
578
579 // data - NULL is a valid value, must be checked
580 jvmtiError
581 JvmtiEnv::SetEnvironmentLocalStorage(const void* data) {
582 set_env_local_storage(data);
583 return JVMTI_ERROR_NONE;
584 } /* end SetEnvironmentLocalStorage */
585
586
587 // data_ptr - pre-checked for NULL
588 jvmtiError
589 JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) {
590 *data_ptr = (void*)get_env_local_storage();
591 return JVMTI_ERROR_NONE;
592 } /* end GetEnvironmentLocalStorage */
593
594 // version_ptr - pre-checked for NULL
595 jvmtiError
596 JvmtiEnv::GetVersionNumber(jint* version_ptr) {
597 *version_ptr = JVMTI_VERSION;
598 return JVMTI_ERROR_NONE;
599 } /* end GetVersionNumber */
600
601
602 // name_ptr - pre-checked for NULL
603 jvmtiError
604 JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) {
605 if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) {
606 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
607 }
608 const char *name = JvmtiUtil::error_name(error);
609 if (name == NULL) {
610 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
611 }
612 size_t len = strlen(name) + 1;
613 jvmtiError err = allocate(len, (unsigned char**)name_ptr);
614 if (err == JVMTI_ERROR_NONE) {
615 memcpy(*name_ptr, name, len);
616 }
617 return err;
618 } /* end GetErrorName */
619
620
621 jvmtiError
622 JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) {
623 switch (flag) {
624 case JVMTI_VERBOSE_OTHER:
625 // ignore
626 break;
627 case JVMTI_VERBOSE_CLASS:
628 TraceClassLoading = value != 0;
629 TraceClassUnloading = value != 0;
630 break;
631 case JVMTI_VERBOSE_GC:
632 PrintGC = value != 0;
633 break;
634 case JVMTI_VERBOSE_JNI:
635 PrintJNIResolving = value != 0;
636 break;
637 default:
638 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
639 };
640 return JVMTI_ERROR_NONE;
641 } /* end SetVerboseFlag */
642
643
644 // format_ptr - pre-checked for NULL
645 jvmtiError
646 JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) {
647 *format_ptr = JVMTI_JLOCATION_JVMBCI;
648 return JVMTI_ERROR_NONE;
649 } /* end GetJLocationFormat */
650
651 //
652 // Thread functions
653 //
654
655 // Threads_lock NOT held
656 // thread - NOT pre-checked
657 // thread_state_ptr - pre-checked for NULL
658 jvmtiError
659 JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) {
660 jint state;
661 oop thread_oop;
662 JavaThread* thr;
663
664 if (thread == NULL) {
665 thread_oop = JavaThread::current()->threadObj();
666 } else {
667 thread_oop = JNIHandles::resolve_external_guard(thread);
668 }
669
670 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) {
671 return JVMTI_ERROR_INVALID_THREAD;
672 }
673
674 // get most state bits
675 state = (jint)java_lang_Thread::get_thread_status(thread_oop);
676
677 // add more state bits
678 thr = java_lang_Thread::thread(thread_oop);
679 if (thr != NULL) {
680 JavaThreadState jts = thr->thread_state();
681
682 if (thr->is_being_ext_suspended()) {
683 state |= JVMTI_THREAD_STATE_SUSPENDED;
684 }
685 if (jts == _thread_in_native) {
686 state |= JVMTI_THREAD_STATE_IN_NATIVE;
687 }
688 OSThread* osThread = thr->osthread();
689 if (osThread != NULL && osThread->interrupted()) {
690 state |= JVMTI_THREAD_STATE_INTERRUPTED;
691 }
692 }
693
694 *thread_state_ptr = state;
695 return JVMTI_ERROR_NONE;
696 } /* end GetThreadState */
697
698
699 // thread_ptr - pre-checked for NULL
700 jvmtiError
701 JvmtiEnv::GetCurrentThread(jthread* thread_ptr) {
702 JavaThread* current_thread = JavaThread::current();
703 *thread_ptr = (jthread)JNIHandles::make_local(current_thread, current_thread->threadObj());
704 return JVMTI_ERROR_NONE;
705 } /* end GetCurrentThread */
706
707
708 // threads_count_ptr - pre-checked for NULL
709 // threads_ptr - pre-checked for NULL
710 jvmtiError
711 JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) {
712 int nthreads = 0;
713 Handle *thread_objs = NULL;
714 ResourceMark rm;
715 HandleMark hm;
716
717 // enumerate threads (including agent threads)
718 ThreadsListEnumerator tle(Thread::current(), true);
719 nthreads = tle.num_threads();
720 *threads_count_ptr = nthreads;
721
722 if (nthreads == 0) {
723 *threads_ptr = NULL;
724 return JVMTI_ERROR_NONE;
725 }
726
727 thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads);
728 NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY);
729
730 for (int i = 0; i < nthreads; i++) {
731 thread_objs[i] = Handle(tle.get_threadObj(i));
732 }
733
734 // have to make global handles outside of Threads_lock
735 jthread *jthreads = new_jthreadArray(nthreads, thread_objs);
736 NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY);
737
738 *threads_ptr = jthreads;
739 return JVMTI_ERROR_NONE;
740 } /* end GetAllThreads */
741
742
743 // Threads_lock NOT held, java_thread not protected by lock
744 // java_thread - pre-checked
745 jvmtiError
746 JvmtiEnv::SuspendThread(JavaThread* java_thread) {
747 // don't allow hidden thread suspend request.
748 if (java_thread->is_hidden_from_external_view()) {
749 return (JVMTI_ERROR_NONE);
750 }
751
752 {
753 MutexLockerEx ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag);
754 if (java_thread->is_external_suspend()) {
755 // don't allow nested external suspend requests.
756 return (JVMTI_ERROR_THREAD_SUSPENDED);
757 }
758 if (java_thread->is_exiting()) { // thread is in the process of exiting
759 return (JVMTI_ERROR_THREAD_NOT_ALIVE);
760 }
761 java_thread->set_external_suspend();
762 }
763
764 if (!JvmtiSuspendControl::suspend(java_thread)) {
765 // the thread was in the process of exiting
766 return (JVMTI_ERROR_THREAD_NOT_ALIVE);
767 }
768 return JVMTI_ERROR_NONE;
769 } /* end SuspendThread */
770
771
772 // request_count - pre-checked to be greater than or equal to 0
773 // request_list - pre-checked for NULL
774 // results - pre-checked for NULL
775 jvmtiError
776 JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
777 int needSafepoint = 0; // > 0 if we need a safepoint
778 for (int i = 0; i < request_count; i++) {
779 JavaThread *java_thread = get_JavaThread(request_list[i]);
780 if (java_thread == NULL) {
781 results[i] = JVMTI_ERROR_INVALID_THREAD;
782 continue;
783 }
784 // the thread has not yet run or has exited (not on threads list)
785 if (java_thread->threadObj() == NULL) {
786 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
787 continue;
788 }
789 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) {
790 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
791 continue;
792 }
793 // don't allow hidden thread suspend request.
794 if (java_thread->is_hidden_from_external_view()) {
795 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend
796 continue;
797 }
798
799 {
800 MutexLockerEx ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag);
801 if (java_thread->is_external_suspend()) {
802 // don't allow nested external suspend requests.
803 results[i] = JVMTI_ERROR_THREAD_SUSPENDED;
804 continue;
805 }
806 if (java_thread->is_exiting()) { // thread is in the process of exiting
807 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
808 continue;
809 }
810 java_thread->set_external_suspend();
811 }
812 if (java_thread->thread_state() == _thread_in_native) {
813 // We need to try and suspend native threads here. Threads in
814 // other states will self-suspend on their next transition.
815 if (!JvmtiSuspendControl::suspend(java_thread)) {
816 // The thread was in the process of exiting. Force another
817 // safepoint to make sure that this thread transitions.
818 needSafepoint++;
819 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
820 continue;
821 }
822 } else {
823 needSafepoint++;
824 }
825 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend
826 }
827 if (needSafepoint > 0) {
828 VM_ForceSafepoint vfs;
829 VMThread::execute(&vfs);
830 }
831 // per-thread suspend results returned via results parameter
832 return JVMTI_ERROR_NONE;
833 } /* end SuspendThreadList */
834
835
836 // Threads_lock NOT held, java_thread not protected by lock
837 // java_thread - pre-checked
838 jvmtiError
839 JvmtiEnv::ResumeThread(JavaThread* java_thread) {
840 // don't allow hidden thread resume request.
841 if (java_thread->is_hidden_from_external_view()) {
842 return JVMTI_ERROR_NONE;
843 }
844
845 if (!java_thread->is_being_ext_suspended()) {
846 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
847 }
848
849 if (!JvmtiSuspendControl::resume(java_thread)) {
850 return JVMTI_ERROR_INTERNAL;
851 }
852 return JVMTI_ERROR_NONE;
853 } /* end ResumeThread */
854
855
856 // request_count - pre-checked to be greater than or equal to 0
857 // request_list - pre-checked for NULL
858 // results - pre-checked for NULL
859 jvmtiError
860 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
861 for (int i = 0; i < request_count; i++) {
862 JavaThread *java_thread = get_JavaThread(request_list[i]);
863 if (java_thread == NULL) {
864 results[i] = JVMTI_ERROR_INVALID_THREAD;
865 continue;
866 }
867 // don't allow hidden thread resume request.
868 if (java_thread->is_hidden_from_external_view()) {
869 results[i] = JVMTI_ERROR_NONE; // indicate successful resume
870 continue;
871 }
872 if (!java_thread->is_being_ext_suspended()) {
873 results[i] = JVMTI_ERROR_THREAD_NOT_SUSPENDED;
874 continue;
875 }
876
877 if (!JvmtiSuspendControl::resume(java_thread)) {
878 results[i] = JVMTI_ERROR_INTERNAL;
879 continue;
880 }
881
882 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend
883 }
884 // per-thread resume results returned via results parameter
885 return JVMTI_ERROR_NONE;
886 } /* end ResumeThreadList */
887
888
889 // Threads_lock NOT held, java_thread not protected by lock
890 // java_thread - pre-checked
891 jvmtiError
892 JvmtiEnv::StopThread(JavaThread* java_thread, jobject exception) {
893 oop e = JNIHandles::resolve_external_guard(exception);
894 NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
895
896 JavaThread::send_async_exception(java_thread->threadObj(), e);
897
898 return JVMTI_ERROR_NONE;
899
900 } /* end StopThread */
901
902
903 // Threads_lock NOT held
904 // thread - NOT pre-checked
905 jvmtiError
906 JvmtiEnv::InterruptThread(jthread thread) {
907 oop thread_oop = JNIHandles::resolve_external_guard(thread);
908 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass()))
909 return JVMTI_ERROR_INVALID_THREAD;
910
911 JavaThread* current_thread = JavaThread::current();
912
913 // Todo: this is a duplicate of JVM_Interrupt; share code in future
914 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
915 MutexLockerEx ml(current_thread->threadObj() == thread_oop ? NULL : Threads_lock);
916 // We need to re-resolve the java_thread, since a GC might have happened during the
917 // acquire of the lock
918
919 JavaThread* java_thread = java_lang_Thread::thread(JNIHandles::resolve_external_guard(thread));
920 NULL_CHECK(java_thread, JVMTI_ERROR_THREAD_NOT_ALIVE);
921
922 Thread::interrupt(java_thread);
923
924 return JVMTI_ERROR_NONE;
925 } /* end InterruptThread */
926
927
928 // Threads_lock NOT held
929 // thread - NOT pre-checked
930 // info_ptr - pre-checked for NULL
931 jvmtiError
932 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
933 ResourceMark rm;
934 HandleMark hm;
935
936 JavaThread* current_thread = JavaThread::current();
937
938 // if thread is NULL the current thread is used
939 oop thread_oop;
940 if (thread == NULL) {
941 thread_oop = current_thread->threadObj();
942 } else {
943 thread_oop = JNIHandles::resolve_external_guard(thread);
944 }
945 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass()))
946 return JVMTI_ERROR_INVALID_THREAD;
947
948 Handle thread_obj(current_thread, thread_oop);
949 Handle name;
950 ThreadPriority priority;
951 Handle thread_group;
952 Handle context_class_loader;
953 bool is_daemon;
954
955 name = Handle(current_thread, java_lang_Thread::name(thread_obj()));
956 priority = java_lang_Thread::priority(thread_obj());
957 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
958 is_daemon = java_lang_Thread::is_daemon(thread_obj());
959
960 oop loader = java_lang_Thread::context_class_loader(thread_obj());
961 context_class_loader = Handle(current_thread, loader);
962
963 { const char *n;
964
965 if (name() != NULL) {
966 n = java_lang_String::as_utf8_string(name());
967 } else {
968 n = UNICODE::as_utf8(NULL, 0);
969 }
970
971 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
972 if (info_ptr->name == NULL)
973 return JVMTI_ERROR_OUT_OF_MEMORY;
974
975 strcpy(info_ptr->name, n);
976 }
977 info_ptr->is_daemon = is_daemon;
978 info_ptr->priority = priority;
979
980 info_ptr->context_class_loader = (context_class_loader.is_null()) ? NULL :
981 jni_reference(context_class_loader);
982 info_ptr->thread_group = jni_reference(thread_group);
983
984 return JVMTI_ERROR_NONE;
985 } /* end GetThreadInfo */
986
987
988 // Threads_lock NOT held, java_thread not protected by lock
989 // java_thread - pre-checked
990 // owned_monitor_count_ptr - pre-checked for NULL
991 // owned_monitors_ptr - pre-checked for NULL
992 jvmtiError
993 JvmtiEnv::GetOwnedMonitorInfo(JavaThread* java_thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
994 jvmtiError err = JVMTI_ERROR_NONE;
995 JavaThread* calling_thread = JavaThread::current();
996
997 // growable array of jvmti monitors info on the C-heap
998 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
999 new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true);
1000
1001 // It is only safe to perform the direct operation on the current
1002 // thread. All other usage needs to use a vm-safepoint-op for safety.
1003 if (java_thread == calling_thread) {
1004 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1005 } else {
1006 // JVMTI get monitors info at safepoint. Do not require target thread to
1007 // be suspended.
1008 VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list);
1009 VMThread::execute(&op);
1010 err = op.result();
1011 }
1012 jint owned_monitor_count = owned_monitors_list->length();
1013 if (err == JVMTI_ERROR_NONE) {
1014 if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1015 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1016 // copy into the returned array
1017 for (int i = 0; i < owned_monitor_count; i++) {
1018 (*owned_monitors_ptr)[i] =
1019 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1020 }
1021 *owned_monitor_count_ptr = owned_monitor_count;
1022 }
1023 }
1024 // clean up.
1025 for (int i = 0; i < owned_monitor_count; i++) {
1026 deallocate((unsigned char*)owned_monitors_list->at(i));
1027 }
1028 delete owned_monitors_list;
1029
1030 return err;
1031 } /* end GetOwnedMonitorInfo */
1032
1033
1034 // Threads_lock NOT held, java_thread not protected by lock
1035 // java_thread - pre-checked
1036 // monitor_info_count_ptr - pre-checked for NULL
1037 // monitor_info_ptr - pre-checked for NULL
1038 jvmtiError
1039 JvmtiEnv::GetOwnedMonitorStackDepthInfo(JavaThread* java_thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1040 jvmtiError err = JVMTI_ERROR_NONE;
1041 JavaThread* calling_thread = JavaThread::current();
1042
1043 // growable array of jvmti monitors info on the C-heap
1044 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1045 new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true);
1046
1047 // It is only safe to perform the direct operation on the current
1048 // thread. All other usage needs to use a vm-safepoint-op for safety.
1049 if (java_thread == calling_thread) {
1050 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1051 } else {
1052 // JVMTI get owned monitors info at safepoint. Do not require target thread to
1053 // be suspended.
1054 VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list);
1055 VMThread::execute(&op);
1056 err = op.result();
1057 }
1058
1059 jint owned_monitor_count = owned_monitors_list->length();
1060 if (err == JVMTI_ERROR_NONE) {
1061 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1062 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1063 // copy to output array.
1064 for (int i = 0; i < owned_monitor_count; i++) {
1065 (*monitor_info_ptr)[i].monitor =
1066 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1067 (*monitor_info_ptr)[i].stack_depth =
1068 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1069 }
1070 }
1071 *monitor_info_count_ptr = owned_monitor_count;
1072 }
1073
1074 // clean up.
1075 for (int i = 0; i < owned_monitor_count; i++) {
1076 deallocate((unsigned char*)owned_monitors_list->at(i));
1077 }
1078 delete owned_monitors_list;
1079
1080 return err;
1081 } /* end GetOwnedMonitorStackDepthInfo */
1082
1083
1084 // Threads_lock NOT held, java_thread not protected by lock
1085 // java_thread - pre-checked
1086 // monitor_ptr - pre-checked for NULL
1087 jvmtiError
1088 JvmtiEnv::GetCurrentContendedMonitor(JavaThread* java_thread, jobject* monitor_ptr) {
1089 jvmtiError err = JVMTI_ERROR_NONE;
1090 JavaThread* calling_thread = JavaThread::current();
1091
1092 // It is only safe to perform the direct operation on the current
1093 // thread. All other usage needs to use a vm-safepoint-op for safety.
1094 if (java_thread == calling_thread) {
1095 err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr);
1096 } else {
1097 // get contended monitor information at safepoint.
1098 VM_GetCurrentContendedMonitor op(this, calling_thread, java_thread, monitor_ptr);
1099 VMThread::execute(&op);
1100 err = op.result();
1101 }
1102 return err;
1103 } /* end GetCurrentContendedMonitor */
1104
1105
1106 // Threads_lock NOT held
1107 // thread - NOT pre-checked
1108 // proc - pre-checked for NULL
1109 // arg - NULL is a valid value, must be checked
1110 jvmtiError
1111 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1112 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1113 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) {
1114 return JVMTI_ERROR_INVALID_THREAD;
1115 }
1116 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1117 return JVMTI_ERROR_INVALID_PRIORITY;
1118 }
1119
1120 //Thread-self
1121 JavaThread* current_thread = JavaThread::current();
1122
1123 Handle thread_hndl(current_thread, thread_oop);
1124 {
1125 MutexLocker mu(Threads_lock); // grab Threads_lock
1126
1127 JvmtiAgentThread *new_thread = new JvmtiAgentThread(this, proc, arg);
1128
1129 // At this point it may be possible that no osthread was created for the
1130 // JavaThread due to lack of memory.
1131 if (new_thread == NULL || new_thread->osthread() == NULL) {
1132 if (new_thread) delete new_thread;
1133 return JVMTI_ERROR_OUT_OF_MEMORY;
1134 }
1135
1136 java_lang_Thread::set_thread(thread_hndl(), new_thread);
1137 java_lang_Thread::set_priority(thread_hndl(), (ThreadPriority)priority);
1138 java_lang_Thread::set_daemon(thread_hndl());
1139
1140 new_thread->set_threadObj(thread_hndl());
1141 Threads::add(new_thread);
1142 Thread::start(new_thread);
1143 } // unlock Threads_lock
1144
1145 return JVMTI_ERROR_NONE;
1146 } /* end RunAgentThread */
1147
1148 //
1149 // Thread Group functions
1150 //
1151
1152 // group_count_ptr - pre-checked for NULL
1153 // groups_ptr - pre-checked for NULL
1154 jvmtiError
1155 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1156 JavaThread* current_thread = JavaThread::current();
1157
1158 // Only one top level thread group now.
1159 *group_count_ptr = 1;
1160
1161 // Allocate memory to store global-refs to the thread groups.
1162 // Assume this area is freed by caller.
1163 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1164
1165 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1166
1167 // Convert oop to Handle, then convert Handle to global-ref.
1168 {
1169 HandleMark hm(current_thread);
1170 Handle system_thread_group(current_thread, Universe::system_thread_group());
1171 *groups_ptr[0] = jni_reference(system_thread_group);
1172 }
1173
1174 return JVMTI_ERROR_NONE;
1175 } /* end GetTopThreadGroups */
1176
1177
1178 // info_ptr - pre-checked for NULL
1179 jvmtiError
1180 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1181 ResourceMark rm;
1182 HandleMark hm;
1183
1184 JavaThread* current_thread = JavaThread::current();
1185
1186 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1187 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1188
1189 typeArrayHandle name;
1190 Handle parent_group;
1191 bool is_daemon;
1192 ThreadPriority max_priority;
1193
1194 name = typeArrayHandle(current_thread,
1195 java_lang_ThreadGroup::name(group_obj()));
1196 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1197 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj());
1198 max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1199
1200 info_ptr->is_daemon = is_daemon;
1201 info_ptr->max_priority = max_priority;
1202 info_ptr->parent = jni_reference(parent_group);
1203
1204 if (name() != NULL) {
1205 const char* n = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
1206 info_ptr->name = (char *)jvmtiMalloc(strlen(n)+1);
1207 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1208 strcpy(info_ptr->name, n);
1209 } else {
1210 info_ptr->name = NULL;
1211 }
1212
1213 return JVMTI_ERROR_NONE;
1214 } /* end GetThreadGroupInfo */
1215
1216
1217 // thread_count_ptr - pre-checked for NULL
1218 // threads_ptr - pre-checked for NULL
1219 // group_count_ptr - pre-checked for NULL
1220 // groups_ptr - pre-checked for NULL
1221 jvmtiError
1222 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1223 JavaThread* current_thread = JavaThread::current();
1224 oop group_obj = (oop) JNIHandles::resolve_external_guard(group);
1225 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1226
1227 Handle *thread_objs = NULL;
1228 Handle *group_objs = NULL;
1229 int nthreads = 0;
1230 int ngroups = 0;
1231 int hidden_threads = 0;
1232
1233 ResourceMark rm;
1234 HandleMark hm;
1235
1236 Handle group_hdl(current_thread, group_obj);
1237
1238 {
1239 ObjectLocker ol(group_hdl, current_thread);
1240 nthreads = java_lang_ThreadGroup::nthreads(group_hdl());
1241 ngroups = java_lang_ThreadGroup::ngroups(group_hdl());
1242
1243 if (nthreads > 0) {
1244 objArrayOop threads = java_lang_ThreadGroup::threads(group_hdl());
1245 assert(nthreads <= threads->length(), "too many threads");
1246 thread_objs = NEW_RESOURCE_ARRAY(Handle,nthreads);
1247 for (int i = 0, j = 0; i < nthreads; i++) {
1248 oop thread_obj = threads->obj_at(i);
1249 assert(thread_obj != NULL, "thread_obj is NULL");
1250 JavaThread *javathread = java_lang_Thread::thread(thread_obj);
1251 // Filter out hidden java threads.
1252 if (javathread != NULL && javathread->is_hidden_from_external_view()) {
1253 hidden_threads++;
1254 continue;
1255 }
1256 thread_objs[j++] = Handle(current_thread, thread_obj);
1257 }
1258 nthreads -= hidden_threads;
1259 }
1260 if (ngroups > 0) {
1261 objArrayOop groups = java_lang_ThreadGroup::groups(group_hdl());
1262 assert(ngroups <= groups->length(), "too many threads");
1263 group_objs = NEW_RESOURCE_ARRAY(Handle,ngroups);
1264 for (int i = 0; i < ngroups; i++) {
1265 oop group_obj = groups->obj_at(i);
1266 assert(group_obj != NULL, "group_obj != NULL");
1267 group_objs[i] = Handle(current_thread, group_obj);
1268 }
1269 }
1270 } // ThreadGroup unlocked here
1271
1272 *group_count_ptr = ngroups;
1273 *thread_count_ptr = nthreads;
1274 *threads_ptr = new_jthreadArray(nthreads, thread_objs);
1275 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs);
1276 if ((nthreads > 0) && (*threads_ptr == NULL)) {
1277 return JVMTI_ERROR_OUT_OF_MEMORY;
1278 }
1279 if ((ngroups > 0) && (*groups_ptr == NULL)) {
1280 return JVMTI_ERROR_OUT_OF_MEMORY;
1281 }
1282
1283 return JVMTI_ERROR_NONE;
1284 } /* end GetThreadGroupChildren */
1285
1286
1287 //
1288 // Stack Frame functions
1289 //
1290
1291 // Threads_lock NOT held, java_thread not protected by lock
1292 // java_thread - pre-checked
1293 // max_frame_count - pre-checked to be greater than or equal to 0
1294 // frame_buffer - pre-checked for NULL
1295 // count_ptr - pre-checked for NULL
1296 jvmtiError
1297 JvmtiEnv::GetStackTrace(JavaThread* java_thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1298 jvmtiError err = JVMTI_ERROR_NONE;
1299
1300 // It is only safe to perform the direct operation on the current
1301 // thread. All other usage needs to use a vm-safepoint-op for safety.
1302 if (java_thread == JavaThread::current()) {
1303 err = get_stack_trace(java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1304 } else {
1305 // JVMTI get stack trace at safepoint. Do not require target thread to
1306 // be suspended.
1307 VM_GetStackTrace op(this, java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1308 VMThread::execute(&op);
1309 err = op.result();
1310 }
1311
1312 return err;
1313 } /* end GetStackTrace */
1314
1315
1316 // max_frame_count - pre-checked to be greater than or equal to 0
1317 // stack_info_ptr - pre-checked for NULL
1318 // thread_count_ptr - pre-checked for NULL
1319 jvmtiError
1320 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1321 jvmtiError err = JVMTI_ERROR_NONE;
1322 JavaThread* calling_thread = JavaThread::current();
1323
1324 // JVMTI get stack traces at safepoint.
1325 VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1326 VMThread::execute(&op);
1327 *thread_count_ptr = op.final_thread_count();
1328 *stack_info_ptr = op.stack_info();
1329 err = op.result();
1330 return err;
1331 } /* end GetAllStackTraces */
1332
1333
1334 // thread_count - pre-checked to be greater than or equal to 0
1335 // thread_list - pre-checked for NULL
1336 // max_frame_count - pre-checked to be greater than or equal to 0
1337 // stack_info_ptr - pre-checked for NULL
1338 jvmtiError
1339 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1340 jvmtiError err = JVMTI_ERROR_NONE;
1341 // JVMTI get stack traces at safepoint.
1342 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1343 VMThread::execute(&op);
1344 err = op.result();
1345 if (err == JVMTI_ERROR_NONE) {
1346 *stack_info_ptr = op.stack_info();
1347 }
1348 return err;
1349 } /* end GetThreadListStackTraces */
1350
1351
1352 // Threads_lock NOT held, java_thread not protected by lock
1353 // java_thread - pre-checked
1354 // count_ptr - pre-checked for NULL
1355 jvmtiError
1356 JvmtiEnv::GetFrameCount(JavaThread* java_thread, jint* count_ptr) {
1357 jvmtiError err = JVMTI_ERROR_NONE;
1358
1359 // retrieve or create JvmtiThreadState.
1360 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1361 if (state == NULL) {
1362 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1363 }
1364 uint32_t debug_bits = 0;
1365 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
1366 err = get_frame_count(state, count_ptr);
1367 } else {
1368 // get java stack frame count at safepoint.
1369 VM_GetFrameCount op(this, state, count_ptr);
1370 VMThread::execute(&op);
1371 err = op.result();
1372 }
1373 return err;
1374 } /* end GetFrameCount */
1375
1376
1377 // Threads_lock NOT held, java_thread not protected by lock
1378 // java_thread - pre-checked
1379 jvmtiError
1380 JvmtiEnv::PopFrame(JavaThread* java_thread) {
1381 JavaThread* current_thread = JavaThread::current();
1382 HandleMark hm(current_thread);
1383 uint32_t debug_bits = 0;
1384
1385 // retrieve or create the state
1386 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1387 if (state == NULL) {
1388 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1389 }
1390
1391 // Check if java_thread is fully suspended
1392 if (!is_thread_fully_suspended(java_thread, true /* wait for suspend completion */, &debug_bits)) {
1393 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1394 }
1395 // Check to see if a PopFrame was already in progress
1396 if (java_thread->popframe_condition() != JavaThread::popframe_inactive) {
1397 // Probably possible for JVMTI clients to trigger this, but the
1398 // JPDA backend shouldn't allow this to happen
1399 return JVMTI_ERROR_INTERNAL;
1400 }
1401
1402 {
1403 // Was workaround bug
1404 // 4812902: popFrame hangs if the method is waiting at a synchronize
1405 // Catch this condition and return an error to avoid hanging.
1406 // Now JVMTI spec allows an implementation to bail out with an opaque frame error.
1407 OSThread* osThread = java_thread->osthread();
1408 if (osThread->get_state() == MONITOR_WAIT) {
1409 return JVMTI_ERROR_OPAQUE_FRAME;
1410 }
1411 }
1412
1413 {
1414 ResourceMark rm(current_thread);
1415 // Check if there are more than one Java frame in this thread, that the top two frames
1416 // are Java (not native) frames, and that there is no intervening VM frame
1417 int frame_count = 0;
1418 bool is_interpreted[2];
1419 intptr_t *frame_sp[2];
1420 // The 2-nd arg of constructor is needed to stop iterating at java entry frame.
1421 for (vframeStream vfs(java_thread, true); !vfs.at_end(); vfs.next()) {
1422 methodHandle mh(current_thread, vfs.method());
1423 if (mh->is_native()) return(JVMTI_ERROR_OPAQUE_FRAME);
1424 is_interpreted[frame_count] = vfs.is_interpreted_frame();
1425 frame_sp[frame_count] = vfs.frame_id();
1426 if (++frame_count > 1) break;
1427 }
1428 if (frame_count < 2) {
1429 // We haven't found two adjacent non-native Java frames on the top.
1430 // There can be two situations here:
1431 // 1. There are no more java frames
1432 // 2. Two top java frames are separated by non-java native frames
1433 if(vframeFor(java_thread, 1) == NULL) {
1434 return JVMTI_ERROR_NO_MORE_FRAMES;
1435 } else {
1436 // Intervening non-java native or VM frames separate java frames.
1437 // Current implementation does not support this. See bug #5031735.
1438 // In theory it is possible to pop frames in such cases.
1439 return JVMTI_ERROR_OPAQUE_FRAME;
1440 }
1441 }
1442
1443 // If any of the top 2 frames is a compiled one, need to deoptimize it
1444 for (int i = 0; i < 2; i++) {
1445 if (!is_interpreted[i]) {
1446 Deoptimization::deoptimize_frame(java_thread, frame_sp[i]);
1447 }
1448 }
1449
1450 // Update the thread state to reflect that the top frame is popped
1451 // so that cur_stack_depth is maintained properly and all frameIDs
1452 // are invalidated.
1453 // The current frame will be popped later when the suspended thread
1454 // is resumed and right before returning from VM to Java.
1455 // (see call_VM_base() in assembler_<cpu>.cpp).
1456
1457 // It's fine to update the thread state here because no JVMTI events
1458 // shall be posted for this PopFrame.
1459
1460 state->update_for_pop_top_frame();
1461 java_thread->set_popframe_condition(JavaThread::popframe_pending_bit);
1462 // Set pending step flag for this popframe and it is cleared when next
1463 // step event is posted.
1464 state->set_pending_step_for_popframe();
1465 }
1466
1467 return JVMTI_ERROR_NONE;
1468 } /* end PopFrame */
1469
1470
1471 // Threads_lock NOT held, java_thread not protected by lock
1472 // java_thread - pre-checked
1473 // java_thread - unchecked
1474 // depth - pre-checked as non-negative
1475 // method_ptr - pre-checked for NULL
1476 // location_ptr - pre-checked for NULL
1477 jvmtiError
1478 JvmtiEnv::GetFrameLocation(JavaThread* java_thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1479 jvmtiError err = JVMTI_ERROR_NONE;
1480 uint32_t debug_bits = 0;
1481
1482 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
1483 err = get_frame_location(java_thread, depth, method_ptr, location_ptr);
1484 } else {
1485 // JVMTI get java stack frame location at safepoint.
1486 VM_GetFrameLocation op(this, java_thread, depth, method_ptr, location_ptr);
1487 VMThread::execute(&op);
1488 err = op.result();
1489 }
1490 return err;
1491 } /* end GetFrameLocation */
1492
1493
1494 // Threads_lock NOT held, java_thread not protected by lock
1495 // java_thread - pre-checked
1496 // java_thread - unchecked
1497 // depth - pre-checked as non-negative
1498 jvmtiError
1499 JvmtiEnv::NotifyFramePop(JavaThread* java_thread, jint depth) {
1500 ResourceMark rm;
1501 uint32_t debug_bits = 0;
1502
1503 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread);
1504 if (state == NULL) {
1505 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1506 }
1507
1508 if (!JvmtiEnv::is_thread_fully_suspended(java_thread, true, &debug_bits)) {
1509 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1510 }
1511
1512 if (TraceJVMTICalls) {
1513 JvmtiSuspendControl::print();
1514 }
1515
1516 vframe *vf = vframeFor(java_thread, depth);
1517 if (vf == NULL) {
1518 return JVMTI_ERROR_NO_MORE_FRAMES;
1519 }
1520
1521 if (!vf->is_java_frame() || ((javaVFrame*) vf)->method()->is_native()) {
1522 return JVMTI_ERROR_OPAQUE_FRAME;
1523 }
1524
1525 assert(vf->frame_pointer() != NULL, "frame pointer mustn't be NULL");
1526
1527 int frame_number = state->count_frames() - depth;
1528 state->env_thread_state(this)->set_frame_pop(frame_number);
1529
1530 return JVMTI_ERROR_NONE;
1531 } /* end NotifyFramePop */
1532
1533
1534 //
1535 // Force Early Return functions
1536 //
1537
1538 // Threads_lock NOT held, java_thread not protected by lock
1539 // java_thread - pre-checked
1540 jvmtiError
1541 JvmtiEnv::ForceEarlyReturnObject(JavaThread* java_thread, jobject value) {
1542 jvalue val;
1543 val.l = value;
1544 return force_early_return(java_thread, val, atos);
1545 } /* end ForceEarlyReturnObject */
1546
1547
1548 // Threads_lock NOT held, java_thread not protected by lock
1549 // java_thread - pre-checked
1550 jvmtiError
1551 JvmtiEnv::ForceEarlyReturnInt(JavaThread* java_thread, jint value) {
1552 jvalue val;
1553 val.i = value;
1554 return force_early_return(java_thread, val, itos);
1555 } /* end ForceEarlyReturnInt */
1556
1557
1558 // Threads_lock NOT held, java_thread not protected by lock
1559 // java_thread - pre-checked
1560 jvmtiError
1561 JvmtiEnv::ForceEarlyReturnLong(JavaThread* java_thread, jlong value) {
1562 jvalue val;
1563 val.j = value;
1564 return force_early_return(java_thread, val, ltos);
1565 } /* end ForceEarlyReturnLong */
1566
1567
1568 // Threads_lock NOT held, java_thread not protected by lock
1569 // java_thread - pre-checked
1570 jvmtiError
1571 JvmtiEnv::ForceEarlyReturnFloat(JavaThread* java_thread, jfloat value) {
1572 jvalue val;
1573 val.f = value;
1574 return force_early_return(java_thread, val, ftos);
1575 } /* end ForceEarlyReturnFloat */
1576
1577
1578 // Threads_lock NOT held, java_thread not protected by lock
1579 // java_thread - pre-checked
1580 jvmtiError
1581 JvmtiEnv::ForceEarlyReturnDouble(JavaThread* java_thread, jdouble value) {
1582 jvalue val;
1583 val.d = value;
1584 return force_early_return(java_thread, val, dtos);
1585 } /* end ForceEarlyReturnDouble */
1586
1587
1588 // Threads_lock NOT held, java_thread not protected by lock
1589 // java_thread - pre-checked
1590 jvmtiError
1591 JvmtiEnv::ForceEarlyReturnVoid(JavaThread* java_thread) {
1592 jvalue val;
1593 val.j = 0L;
1594 return force_early_return(java_thread, val, vtos);
1595 } /* end ForceEarlyReturnVoid */
1596
1597
1598 //
1599 // Heap functions
1600 //
1601
1602 // klass - NULL is a valid value, must be checked
1603 // initial_object - NULL is a valid value, must be checked
1604 // callbacks - pre-checked for NULL
1605 // user_data - NULL is a valid value, must be checked
1606 jvmtiError
1607 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1608 // check klass if provided
1609 Klass* k_oop = NULL;
1610 if (klass != NULL) {
1611 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1612 if (k_mirror == NULL) {
1613 return JVMTI_ERROR_INVALID_CLASS;
1614 }
1615 if (java_lang_Class::is_primitive(k_mirror)) {
1616 return JVMTI_ERROR_NONE;
1617 }
1618 k_oop = java_lang_Class::as_Klass(k_mirror);
1619 if (k_oop == NULL) {
1620 return JVMTI_ERROR_INVALID_CLASS;
1621 }
1622 }
1623
1624 if (initial_object != NULL) {
1625 oop init_obj = JNIHandles::resolve_external_guard(initial_object);
1626 if (init_obj == NULL) {
1627 return JVMTI_ERROR_INVALID_OBJECT;
1628 }
1629 }
1630
1631 Thread *thread = Thread::current();
1632 HandleMark hm(thread);
1633 KlassHandle kh (thread, k_oop);
1634
1635 TraceTime t("FollowReferences", TraceJVMTIObjectTagging);
1636 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, kh, initial_object, callbacks, user_data);
1637 return JVMTI_ERROR_NONE;
1638 } /* end FollowReferences */
1639
1640
1641 // klass - NULL is a valid value, must be checked
1642 // callbacks - pre-checked for NULL
1643 // user_data - NULL is a valid value, must be checked
1644 jvmtiError
1645 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1646 // check klass if provided
1647 Klass* k_oop = NULL;
1648 if (klass != NULL) {
1649 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1650 if (k_mirror == NULL) {
1651 return JVMTI_ERROR_INVALID_CLASS;
1652 }
1653 if (java_lang_Class::is_primitive(k_mirror)) {
1654 return JVMTI_ERROR_NONE;
1655 }
1656 k_oop = java_lang_Class::as_Klass(k_mirror);
1657 if (k_oop == NULL) {
1658 return JVMTI_ERROR_INVALID_CLASS;
1659 }
1660 }
1661
1662 Thread *thread = Thread::current();
1663 HandleMark hm(thread);
1664 KlassHandle kh (thread, k_oop);
1665
1666 TraceTime t("IterateThroughHeap", TraceJVMTIObjectTagging);
1667 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, kh, callbacks, user_data);
1668 return JVMTI_ERROR_NONE;
1669 } /* end IterateThroughHeap */
1670
1671
1672 // tag_ptr - pre-checked for NULL
1673 jvmtiError
1674 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
1675 oop o = JNIHandles::resolve_external_guard(object);
1676 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1677 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
1678 return JVMTI_ERROR_NONE;
1679 } /* end GetTag */
1680
1681
1682 jvmtiError
1683 JvmtiEnv::SetTag(jobject object, jlong tag) {
1684 oop o = JNIHandles::resolve_external_guard(object);
1685 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1686 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
1687 return JVMTI_ERROR_NONE;
1688 } /* end SetTag */
1689
1690
1691 // tag_count - pre-checked to be greater than or equal to 0
1692 // tags - pre-checked for NULL
1693 // count_ptr - pre-checked for NULL
1694 // object_result_ptr - NULL is a valid value, must be checked
1695 // tag_result_ptr - NULL is a valid value, must be checked
1696 jvmtiError
1697 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
1698 TraceTime t("GetObjectsWithTags", TraceJVMTIObjectTagging);
1699 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
1700 } /* end GetObjectsWithTags */
1701
1702
1703 jvmtiError
1704 JvmtiEnv::ForceGarbageCollection() {
1705 Universe::heap()->collect(GCCause::_jvmti_force_gc);
1706 return JVMTI_ERROR_NONE;
1707 } /* end ForceGarbageCollection */
1708
1709
1710 //
1711 // Heap (1.0) functions
1712 //
1713
1714 // object_reference_callback - pre-checked for NULL
1715 // user_data - NULL is a valid value, must be checked
1716 jvmtiError
1717 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
1718 oop o = JNIHandles::resolve_external_guard(object);
1719 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1720 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
1721 return JVMTI_ERROR_NONE;
1722 } /* end IterateOverObjectsReachableFromObject */
1723
1724
1725 // heap_root_callback - NULL is a valid value, must be checked
1726 // stack_ref_callback - NULL is a valid value, must be checked
1727 // object_ref_callback - NULL is a valid value, must be checked
1728 // user_data - NULL is a valid value, must be checked
1729 jvmtiError
1730 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
1731 TraceTime t("IterateOverReachableObjects", TraceJVMTIObjectTagging);
1732 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
1733 return JVMTI_ERROR_NONE;
1734 } /* end IterateOverReachableObjects */
1735
1736
1737 // heap_object_callback - pre-checked for NULL
1738 // user_data - NULL is a valid value, must be checked
1739 jvmtiError
1740 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
1741 TraceTime t("IterateOverHeap", TraceJVMTIObjectTagging);
1742 Thread *thread = Thread::current();
1743 HandleMark hm(thread);
1744 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, KlassHandle(), heap_object_callback, user_data);
1745 return JVMTI_ERROR_NONE;
1746 } /* end IterateOverHeap */
1747
1748
1749 // k_mirror - may be primitive, this must be checked
1750 // heap_object_callback - pre-checked for NULL
1751 // user_data - NULL is a valid value, must be checked
1752 jvmtiError
1753 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
1754 if (java_lang_Class::is_primitive(k_mirror)) {
1755 // DO PRIMITIVE CLASS PROCESSING
1756 return JVMTI_ERROR_NONE;
1757 }
1758 Klass* k_oop = java_lang_Class::as_Klass(k_mirror);
1759 if (k_oop == NULL) {
1760 return JVMTI_ERROR_INVALID_CLASS;
1761 }
1762 Thread *thread = Thread::current();
1763 HandleMark hm(thread);
1764 KlassHandle klass (thread, k_oop);
1765 TraceTime t("IterateOverInstancesOfClass", TraceJVMTIObjectTagging);
1766 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
1767 return JVMTI_ERROR_NONE;
1768 } /* end IterateOverInstancesOfClass */
1769
1770
1771 //
1772 // Local Variable functions
1773 //
1774
1775 // Threads_lock NOT held, java_thread not protected by lock
1776 // java_thread - pre-checked
1777 // java_thread - unchecked
1778 // depth - pre-checked as non-negative
1779 // value_ptr - pre-checked for NULL
1780 jvmtiError
1781 JvmtiEnv::GetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject* value_ptr) {
1782 JavaThread* current_thread = JavaThread::current();
1783 // rm object is created to clean up the javaVFrame created in
1784 // doit_prologue(), but after doit() is finished with it.
1785 ResourceMark rm(current_thread);
1786
1787 VM_GetOrSetLocal op(java_thread, current_thread, depth, slot);
1788 VMThread::execute(&op);
1789 jvmtiError err = op.result();
1790 if (err != JVMTI_ERROR_NONE) {
1791 return err;
1792 } else {
1793 *value_ptr = op.value().l;
1794 return JVMTI_ERROR_NONE;
1795 }
1796 } /* end GetLocalObject */
1797
1798 // Threads_lock NOT held, java_thread not protected by lock
1799 // java_thread - pre-checked
1800 // java_thread - unchecked
1801 // depth - pre-checked as non-negative
1802 // value - pre-checked for NULL
1803 jvmtiError
1804 JvmtiEnv::GetLocalInstance(JavaThread* java_thread, jint depth, jobject* value_ptr){
1805 JavaThread* current_thread = JavaThread::current();
1806 // rm object is created to clean up the javaVFrame created in
1807 // doit_prologue(), but after doit() is finished with it.
1808 ResourceMark rm(current_thread);
1809
1810 VM_GetReceiver op(java_thread, current_thread, depth);
1811 VMThread::execute(&op);
1812 jvmtiError err = op.result();
1813 if (err != JVMTI_ERROR_NONE) {
1814 return err;
1815 } else {
1816 *value_ptr = op.value().l;
1817 return JVMTI_ERROR_NONE;
1818 }
1819 } /* end GetLocalInstance */
1820
1821
1822 // Threads_lock NOT held, java_thread not protected by lock
1823 // java_thread - pre-checked
1824 // java_thread - unchecked
1825 // depth - pre-checked as non-negative
1826 // value_ptr - pre-checked for NULL
1827 jvmtiError
1828 JvmtiEnv::GetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint* value_ptr) {
1829 // rm object is created to clean up the javaVFrame created in
1830 // doit_prologue(), but after doit() is finished with it.
1831 ResourceMark rm;
1832
1833 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT);
1834 VMThread::execute(&op);
1835 *value_ptr = op.value().i;
1836 return op.result();
1837 } /* end GetLocalInt */
1838
1839
1840 // Threads_lock NOT held, java_thread not protected by lock
1841 // java_thread - pre-checked
1842 // java_thread - unchecked
1843 // depth - pre-checked as non-negative
1844 // value_ptr - pre-checked for NULL
1845 jvmtiError
1846 JvmtiEnv::GetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong* value_ptr) {
1847 // rm object is created to clean up the javaVFrame created in
1848 // doit_prologue(), but after doit() is finished with it.
1849 ResourceMark rm;
1850
1851 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG);
1852 VMThread::execute(&op);
1853 *value_ptr = op.value().j;
1854 return op.result();
1855 } /* end GetLocalLong */
1856
1857
1858 // Threads_lock NOT held, java_thread not protected by lock
1859 // java_thread - pre-checked
1860 // java_thread - unchecked
1861 // depth - pre-checked as non-negative
1862 // value_ptr - pre-checked for NULL
1863 jvmtiError
1864 JvmtiEnv::GetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat* value_ptr) {
1865 // rm object is created to clean up the javaVFrame created in
1866 // doit_prologue(), but after doit() is finished with it.
1867 ResourceMark rm;
1868
1869 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT);
1870 VMThread::execute(&op);
1871 *value_ptr = op.value().f;
1872 return op.result();
1873 } /* end GetLocalFloat */
1874
1875
1876 // Threads_lock NOT held, java_thread not protected by lock
1877 // java_thread - pre-checked
1878 // java_thread - unchecked
1879 // depth - pre-checked as non-negative
1880 // value_ptr - pre-checked for NULL
1881 jvmtiError
1882 JvmtiEnv::GetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble* value_ptr) {
1883 // rm object is created to clean up the javaVFrame created in
1884 // doit_prologue(), but after doit() is finished with it.
1885 ResourceMark rm;
1886
1887 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE);
1888 VMThread::execute(&op);
1889 *value_ptr = op.value().d;
1890 return op.result();
1891 } /* end GetLocalDouble */
1892
1893
1894 // Threads_lock NOT held, java_thread not protected by lock
1895 // java_thread - pre-checked
1896 // java_thread - unchecked
1897 // depth - pre-checked as non-negative
1898 jvmtiError
1899 JvmtiEnv::SetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject value) {
1900 // rm object is created to clean up the javaVFrame created in
1901 // doit_prologue(), but after doit() is finished with it.
1902 ResourceMark rm;
1903 jvalue val;
1904 val.l = value;
1905 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val);
1906 VMThread::execute(&op);
1907 return op.result();
1908 } /* end SetLocalObject */
1909
1910
1911 // Threads_lock NOT held, java_thread not protected by lock
1912 // java_thread - pre-checked
1913 // java_thread - unchecked
1914 // depth - pre-checked as non-negative
1915 jvmtiError
1916 JvmtiEnv::SetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint value) {
1917 // rm object is created to clean up the javaVFrame created in
1918 // doit_prologue(), but after doit() is finished with it.
1919 ResourceMark rm;
1920 jvalue val;
1921 val.i = value;
1922 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val);
1923 VMThread::execute(&op);
1924 return op.result();
1925 } /* end SetLocalInt */
1926
1927
1928 // Threads_lock NOT held, java_thread not protected by lock
1929 // java_thread - pre-checked
1930 // java_thread - unchecked
1931 // depth - pre-checked as non-negative
1932 jvmtiError
1933 JvmtiEnv::SetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong value) {
1934 // rm object is created to clean up the javaVFrame created in
1935 // doit_prologue(), but after doit() is finished with it.
1936 ResourceMark rm;
1937 jvalue val;
1938 val.j = value;
1939 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val);
1940 VMThread::execute(&op);
1941 return op.result();
1942 } /* end SetLocalLong */
1943
1944
1945 // Threads_lock NOT held, java_thread not protected by lock
1946 // java_thread - pre-checked
1947 // java_thread - unchecked
1948 // depth - pre-checked as non-negative
1949 jvmtiError
1950 JvmtiEnv::SetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat value) {
1951 // rm object is created to clean up the javaVFrame created in
1952 // doit_prologue(), but after doit() is finished with it.
1953 ResourceMark rm;
1954 jvalue val;
1955 val.f = value;
1956 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val);
1957 VMThread::execute(&op);
1958 return op.result();
1959 } /* end SetLocalFloat */
1960
1961
1962 // Threads_lock NOT held, java_thread not protected by lock
1963 // java_thread - pre-checked
1964 // java_thread - unchecked
1965 // depth - pre-checked as non-negative
1966 jvmtiError
1967 JvmtiEnv::SetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble value) {
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 jvalue val;
1972 val.d = value;
1973 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val);
1974 VMThread::execute(&op);
1975 return op.result();
1976 } /* end SetLocalDouble */
1977
1978
1979 //
1980 // Breakpoint functions
1981 //
1982
1983 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
1984 jvmtiError
1985 JvmtiEnv::SetBreakpoint(Method* method_oop, jlocation location) {
1986 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
1987 if (location < 0) { // simple invalid location check first
1988 return JVMTI_ERROR_INVALID_LOCATION;
1989 }
1990 // verify that the breakpoint is not past the end of the method
1991 if (location >= (jlocation) method_oop->code_size()) {
1992 return JVMTI_ERROR_INVALID_LOCATION;
1993 }
1994
1995 ResourceMark rm;
1996 JvmtiBreakpoint bp(method_oop, location);
1997 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
1998 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
1999 return JVMTI_ERROR_DUPLICATE;
2000
2001 if (TraceJVMTICalls) {
2002 jvmti_breakpoints.print();
2003 }
2004
2005 return JVMTI_ERROR_NONE;
2006 } /* end SetBreakpoint */
2007
2008
2009 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2010 jvmtiError
2011 JvmtiEnv::ClearBreakpoint(Method* method_oop, jlocation location) {
2012 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2013
2014 if (location < 0) { // simple invalid location check first
2015 return JVMTI_ERROR_INVALID_LOCATION;
2016 }
2017
2018 // verify that the breakpoint is not past the end of the method
2019 if (location >= (jlocation) method_oop->code_size()) {
2020 return JVMTI_ERROR_INVALID_LOCATION;
2021 }
2022
2023 JvmtiBreakpoint bp(method_oop, location);
2024
2025 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2026 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2027 return JVMTI_ERROR_NOT_FOUND;
2028
2029 if (TraceJVMTICalls) {
2030 jvmti_breakpoints.print();
2031 }
2032
2033 return JVMTI_ERROR_NONE;
2034 } /* end ClearBreakpoint */
2035
2036
2037 //
2038 // Watched Field functions
2039 //
2040
2041 jvmtiError
2042 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2043 // make sure we haven't set this watch before
2044 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2045 fdesc_ptr->set_is_field_access_watched(true);
2046
2047 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2048
2049 return JVMTI_ERROR_NONE;
2050 } /* end SetFieldAccessWatch */
2051
2052
2053 jvmtiError
2054 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2055 // make sure we have a watch to clear
2056 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2057 fdesc_ptr->set_is_field_access_watched(false);
2058
2059 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2060
2061 return JVMTI_ERROR_NONE;
2062 } /* end ClearFieldAccessWatch */
2063
2064
2065 jvmtiError
2066 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2067 // make sure we haven't set this watch before
2068 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2069 fdesc_ptr->set_is_field_modification_watched(true);
2070
2071 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2072
2073 return JVMTI_ERROR_NONE;
2074 } /* end SetFieldModificationWatch */
2075
2076
2077 jvmtiError
2078 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2079 // make sure we have a watch to clear
2080 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2081 fdesc_ptr->set_is_field_modification_watched(false);
2082
2083 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2084
2085 return JVMTI_ERROR_NONE;
2086 } /* end ClearFieldModificationWatch */
2087
2088 //
2089 // Class functions
2090 //
2091
2092
2093 // k_mirror - may be primitive, this must be checked
2094 // signature_ptr - NULL is a valid value, must be checked
2095 // generic_ptr - NULL is a valid value, must be checked
2096 jvmtiError
2097 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2098 ResourceMark rm;
2099 bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2100 Klass* k = NULL;
2101 if (!isPrimitive) {
2102 k = java_lang_Class::as_Klass(k_mirror);
2103 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2104 }
2105 if (signature_ptr != NULL) {
2106 char* result = NULL;
2107 if (isPrimitive) {
2108 char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2109 result = (char*) jvmtiMalloc(2);
2110 result[0] = tchar;
2111 result[1] = '\0';
2112 } else {
2113 const char* class_sig = k->signature_name();
2114 result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2115 strcpy(result, class_sig);
2116 }
2117 *signature_ptr = result;
2118 }
2119 if (generic_ptr != NULL) {
2120 *generic_ptr = NULL;
2121 if (!isPrimitive && k->oop_is_instance()) {
2122 Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2123 if (soo != NULL) {
2124 const char *gen_sig = soo->as_C_string();
2125 if (gen_sig != NULL) {
2126 char* gen_result;
2127 jvmtiError err = allocate(strlen(gen_sig) + 1,
2128 (unsigned char **)&gen_result);
2129 if (err != JVMTI_ERROR_NONE) {
2130 return err;
2131 }
2132 strcpy(gen_result, gen_sig);
2133 *generic_ptr = gen_result;
2134 }
2135 }
2136 }
2137 }
2138 return JVMTI_ERROR_NONE;
2139 } /* end GetClassSignature */
2140
2141
2142 // k_mirror - may be primitive, this must be checked
2143 // status_ptr - pre-checked for NULL
2144 jvmtiError
2145 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2146 jint result = 0;
2147 if (java_lang_Class::is_primitive(k_mirror)) {
2148 result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2149 } else {
2150 Klass* k = java_lang_Class::as_Klass(k_mirror);
2151 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2152 result = k->jvmti_class_status();
2153 }
2154 *status_ptr = result;
2155
2156 return JVMTI_ERROR_NONE;
2157 } /* end GetClassStatus */
2158
2159
2160 // k_mirror - may be primitive, this must be checked
2161 // source_name_ptr - pre-checked for NULL
2162 jvmtiError
2163 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2164 if (java_lang_Class::is_primitive(k_mirror)) {
2165 return JVMTI_ERROR_ABSENT_INFORMATION;
2166 }
2167 Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2168 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2169
2170 if (!k_klass->oop_is_instance()) {
2171 return JVMTI_ERROR_ABSENT_INFORMATION;
2172 }
2173
2174 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2175 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2176 {
2177 JavaThread* current_thread = JavaThread::current();
2178 ResourceMark rm(current_thread);
2179 const char* sfncp = (const char*) sfnOop->as_C_string();
2180 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2181 strcpy(*source_name_ptr, sfncp);
2182 }
2183
2184 return JVMTI_ERROR_NONE;
2185 } /* end GetSourceFileName */
2186
2187
2188 // k_mirror - may be primitive, this must be checked
2189 // modifiers_ptr - pre-checked for NULL
2190 jvmtiError
2191 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2192 JavaThread* current_thread = JavaThread::current();
2193 jint result = 0;
2194 if (!java_lang_Class::is_primitive(k_mirror)) {
2195 Klass* k = java_lang_Class::as_Klass(k_mirror);
2196 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2197 result = k->compute_modifier_flags(current_thread);
2198 JavaThread* THREAD = current_thread; // pass to macros
2199 if (HAS_PENDING_EXCEPTION) {
2200 CLEAR_PENDING_EXCEPTION;
2201 return JVMTI_ERROR_INTERNAL;
2202 };
2203
2204 // Reset the deleted ACC_SUPER bit ( deleted in compute_modifier_flags()).
2205 if(k->is_super()) {
2206 result |= JVM_ACC_SUPER;
2207 }
2208 } else {
2209 result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
2210 }
2211 *modifiers_ptr = result;
2212
2213 return JVMTI_ERROR_NONE;
2214 } /* end GetClassModifiers */
2215
2216
2217 // k_mirror - may be primitive, this must be checked
2218 // method_count_ptr - pre-checked for NULL
2219 // methods_ptr - pre-checked for NULL
2220 jvmtiError
2221 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2222 JavaThread* current_thread = JavaThread::current();
2223 HandleMark hm(current_thread);
2224
2225 if (java_lang_Class::is_primitive(k_mirror)) {
2226 *method_count_ptr = 0;
2227 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2228 return JVMTI_ERROR_NONE;
2229 }
2230 Klass* k = java_lang_Class::as_Klass(k_mirror);
2231 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2232
2233 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2234 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2235 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2236 }
2237
2238 if (!k->oop_is_instance()) {
2239 *method_count_ptr = 0;
2240 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2241 return JVMTI_ERROR_NONE;
2242 }
2243 instanceKlassHandle instanceK_h(current_thread, k);
2244 // Allocate the result and fill it in
2245 int result_length = instanceK_h->methods()->length();
2246 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2247 int index;
2248 if (JvmtiExport::can_maintain_original_method_order()) {
2249 // Use the original method ordering indices stored in the class, so we can emit
2250 // jmethodIDs in the order they appeared in the class file
2251 for (index = 0; index < result_length; index++) {
2252 Method* m = instanceK_h->methods()->at(index);
2253 int original_index = instanceK_h->method_ordering()->at(index);
2254 assert(original_index >= 0 && original_index < result_length, "invalid original method index");
2255 jmethodID id = m->jmethod_id();
2256 result_list[original_index] = id;
2257 }
2258 } else {
2259 // otherwise just copy in any order
2260 for (index = 0; index < result_length; index++) {
2261 Method* m = instanceK_h->methods()->at(index);
2262 jmethodID id = m->jmethod_id();
2263 result_list[index] = id;
2264 }
2265 }
2266 // Fill in return value.
2267 *method_count_ptr = result_length;
2268 *methods_ptr = result_list;
2269
2270 return JVMTI_ERROR_NONE;
2271 } /* end GetClassMethods */
2272
2273
2274 // k_mirror - may be primitive, this must be checked
2275 // field_count_ptr - pre-checked for NULL
2276 // fields_ptr - pre-checked for NULL
2277 jvmtiError
2278 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2279 if (java_lang_Class::is_primitive(k_mirror)) {
2280 *field_count_ptr = 0;
2281 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2282 return JVMTI_ERROR_NONE;
2283 }
2284 JavaThread* current_thread = JavaThread::current();
2285 HandleMark hm(current_thread);
2286 Klass* k = java_lang_Class::as_Klass(k_mirror);
2287 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2288
2289 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2290 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2291 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2292 }
2293
2294 if (!k->oop_is_instance()) {
2295 *field_count_ptr = 0;
2296 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2297 return JVMTI_ERROR_NONE;
2298 }
2299
2300
2301 instanceKlassHandle instanceK_h(current_thread, k);
2302
2303 int result_count = 0;
2304 // First, count the fields.
2305 FilteredFieldStream flds(instanceK_h, true, true);
2306 result_count = flds.field_count();
2307
2308 // Allocate the result and fill it in
2309 jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID));
2310 // The JVMTI spec requires fields in the order they occur in the class file,
2311 // this is the reverse order of what FieldStream hands out.
2312 int id_index = (result_count - 1);
2313
2314 for (FilteredFieldStream src_st(instanceK_h, true, true); !src_st.eos(); src_st.next()) {
2315 result_list[id_index--] = jfieldIDWorkaround::to_jfieldID(
2316 instanceK_h, src_st.offset(),
2317 src_st.access_flags().is_static());
2318 }
2319 assert(id_index == -1, "just checking");
2320 // Fill in the results
2321 *field_count_ptr = result_count;
2322 *fields_ptr = result_list;
2323
2324 return JVMTI_ERROR_NONE;
2325 } /* end GetClassFields */
2326
2327
2328 // k_mirror - may be primitive, this must be checked
2329 // interface_count_ptr - pre-checked for NULL
2330 // interfaces_ptr - pre-checked for NULL
2331 jvmtiError
2332 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
2333 {
2334 if (java_lang_Class::is_primitive(k_mirror)) {
2335 *interface_count_ptr = 0;
2336 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2337 return JVMTI_ERROR_NONE;
2338 }
2339 JavaThread* current_thread = JavaThread::current();
2340 HandleMark hm(current_thread);
2341 Klass* k = java_lang_Class::as_Klass(k_mirror);
2342 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2343
2344 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2345 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
2346 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2347
2348 if (!k->oop_is_instance()) {
2349 *interface_count_ptr = 0;
2350 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2351 return JVMTI_ERROR_NONE;
2352 }
2353
2354 Array<Klass*>* interface_list = InstanceKlass::cast(k)->local_interfaces();
2355 const int result_length = (interface_list == NULL ? 0 : interface_list->length());
2356 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
2357 for (int i_index = 0; i_index < result_length; i_index += 1) {
2358 Klass* klass_at = interface_list->at(i_index);
2359 assert(klass_at->is_klass(), "interfaces must be Klass*s");
2360 assert(klass_at->is_interface(), "interfaces must be interfaces");
2361 oop mirror_at = klass_at->java_mirror();
2362 Handle handle_at = Handle(current_thread, mirror_at);
2363 result_list[i_index] = (jclass) jni_reference(handle_at);
2364 }
2365 *interface_count_ptr = result_length;
2366 *interfaces_ptr = result_list;
2367 }
2368
2369 return JVMTI_ERROR_NONE;
2370 } /* end GetImplementedInterfaces */
2371
2372
2373 // k_mirror - may be primitive, this must be checked
2374 // minor_version_ptr - pre-checked for NULL
2375 // major_version_ptr - pre-checked for NULL
2376 jvmtiError
2377 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
2378 if (java_lang_Class::is_primitive(k_mirror)) {
2379 return JVMTI_ERROR_ABSENT_INFORMATION;
2380 }
2381 Klass* k_oop = java_lang_Class::as_Klass(k_mirror);
2382 Thread *thread = Thread::current();
2383 HandleMark hm(thread);
2384 KlassHandle klass(thread, k_oop);
2385
2386 jint status = klass->jvmti_class_status();
2387 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2388 return JVMTI_ERROR_INVALID_CLASS;
2389 }
2390 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2391 return JVMTI_ERROR_ABSENT_INFORMATION;
2392 }
2393
2394 instanceKlassHandle ik(thread, k_oop);
2395 *minor_version_ptr = ik->minor_version();
2396 *major_version_ptr = ik->major_version();
2397
2398 return JVMTI_ERROR_NONE;
2399 } /* end GetClassVersionNumbers */
2400
2401
2402 // k_mirror - may be primitive, this must be checked
2403 // constant_pool_count_ptr - pre-checked for NULL
2404 // constant_pool_byte_count_ptr - pre-checked for NULL
2405 // constant_pool_bytes_ptr - pre-checked for NULL
2406 jvmtiError
2407 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
2408 if (java_lang_Class::is_primitive(k_mirror)) {
2409 return JVMTI_ERROR_ABSENT_INFORMATION;
2410 }
2411
2412 Klass* k_oop = java_lang_Class::as_Klass(k_mirror);
2413 Thread *thread = Thread::current();
2414 HandleMark hm(thread);
2415 ResourceMark rm(thread);
2416 KlassHandle klass(thread, k_oop);
2417
2418 jint status = klass->jvmti_class_status();
2419 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2420 return JVMTI_ERROR_INVALID_CLASS;
2421 }
2422 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2423 return JVMTI_ERROR_ABSENT_INFORMATION;
2424 }
2425
2426 instanceKlassHandle ikh(thread, k_oop);
2427 constantPoolHandle constants(thread, ikh->constants());
2428 MonitorLockerEx ml(constants->lock()); // lock constant pool while we query it
2429
2430 JvmtiConstantPoolReconstituter reconstituter(ikh);
2431 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2432 return reconstituter.get_error();
2433 }
2434
2435 unsigned char *cpool_bytes;
2436 int cpool_size = reconstituter.cpool_size();
2437 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2438 return reconstituter.get_error();
2439 }
2440 jvmtiError res = allocate(cpool_size, &cpool_bytes);
2441 if (res != JVMTI_ERROR_NONE) {
2442 return res;
2443 }
2444 reconstituter.copy_cpool_bytes(cpool_bytes);
2445 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2446 return reconstituter.get_error();
2447 }
2448
2449 *constant_pool_count_ptr = constants->length();
2450 *constant_pool_byte_count_ptr = cpool_size;
2451 *constant_pool_bytes_ptr = cpool_bytes;
2452
2453 return JVMTI_ERROR_NONE;
2454 } /* end GetConstantPool */
2455
2456
2457 // k_mirror - may be primitive, this must be checked
2458 // is_interface_ptr - pre-checked for NULL
2459 jvmtiError
2460 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
2461 {
2462 bool result = false;
2463 if (!java_lang_Class::is_primitive(k_mirror)) {
2464 Klass* k = java_lang_Class::as_Klass(k_mirror);
2465 if (k != NULL && k->is_interface()) {
2466 result = true;
2467 }
2468 }
2469 *is_interface_ptr = result;
2470 }
2471
2472 return JVMTI_ERROR_NONE;
2473 } /* end IsInterface */
2474
2475
2476 // k_mirror - may be primitive, this must be checked
2477 // is_array_class_ptr - pre-checked for NULL
2478 jvmtiError
2479 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
2480 {
2481 bool result = false;
2482 if (!java_lang_Class::is_primitive(k_mirror)) {
2483 Klass* k = java_lang_Class::as_Klass(k_mirror);
2484 if (k != NULL && k->oop_is_array()) {
2485 result = true;
2486 }
2487 }
2488 *is_array_class_ptr = result;
2489 }
2490
2491 return JVMTI_ERROR_NONE;
2492 } /* end IsArrayClass */
2493
2494
2495 // k_mirror - may be primitive, this must be checked
2496 // classloader_ptr - pre-checked for NULL
2497 jvmtiError
2498 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
2499 {
2500 if (java_lang_Class::is_primitive(k_mirror)) {
2501 *classloader_ptr = (jclass) jni_reference(Handle());
2502 return JVMTI_ERROR_NONE;
2503 }
2504 JavaThread* current_thread = JavaThread::current();
2505 HandleMark hm(current_thread);
2506 Klass* k = java_lang_Class::as_Klass(k_mirror);
2507 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2508
2509 oop result_oop = k->class_loader();
2510 if (result_oop == NULL) {
2511 *classloader_ptr = (jclass) jni_reference(Handle());
2512 return JVMTI_ERROR_NONE;
2513 }
2514 Handle result_handle = Handle(current_thread, result_oop);
2515 jclass result_jnihandle = (jclass) jni_reference(result_handle);
2516 *classloader_ptr = result_jnihandle;
2517 }
2518 return JVMTI_ERROR_NONE;
2519 } /* end GetClassLoader */
2520
2521
2522 // k_mirror - may be primitive, this must be checked
2523 // source_debug_extension_ptr - pre-checked for NULL
2524 jvmtiError
2525 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
2526 {
2527 if (java_lang_Class::is_primitive(k_mirror)) {
2528 return JVMTI_ERROR_ABSENT_INFORMATION;
2529 }
2530 Klass* k = java_lang_Class::as_Klass(k_mirror);
2531 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2532 if (!k->oop_is_instance()) {
2533 return JVMTI_ERROR_ABSENT_INFORMATION;
2534 }
2535 char* sde = InstanceKlass::cast(k)->source_debug_extension();
2536 NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
2537
2538 {
2539 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
2540 strcpy(*source_debug_extension_ptr, sde);
2541 }
2542 }
2543
2544 return JVMTI_ERROR_NONE;
2545 } /* end GetSourceDebugExtension */
2546
2547 //
2548 // Object functions
2549 //
2550
2551 // hash_code_ptr - pre-checked for NULL
2552 jvmtiError
2553 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
2554 oop mirror = JNIHandles::resolve_external_guard(object);
2555 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
2556 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
2557
2558 {
2559 jint result = (jint) mirror->identity_hash();
2560 *hash_code_ptr = result;
2561 }
2562 return JVMTI_ERROR_NONE;
2563 } /* end GetObjectHashCode */
2564
2565
2566 // info_ptr - pre-checked for NULL
2567 jvmtiError
2568 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
2569 JavaThread* calling_thread = JavaThread::current();
2570 jvmtiError err = get_object_monitor_usage(calling_thread, object, info_ptr);
2571 if (err == JVMTI_ERROR_THREAD_NOT_SUSPENDED) {
2572 // Some of the critical threads were not suspended. go to a safepoint and try again
2573 VM_GetObjectMonitorUsage op(this, calling_thread, object, info_ptr);
2574 VMThread::execute(&op);
2575 err = op.result();
2576 }
2577 return err;
2578 } /* end GetObjectMonitorUsage */
2579
2580
2581 //
2582 // Field functions
2583 //
2584
2585 // name_ptr - NULL is a valid value, must be checked
2586 // signature_ptr - NULL is a valid value, must be checked
2587 // generic_ptr - NULL is a valid value, must be checked
2588 jvmtiError
2589 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
2590 JavaThread* current_thread = JavaThread::current();
2591 ResourceMark rm(current_thread);
2592 if (name_ptr == NULL) {
2593 // just don't return the name
2594 } else {
2595 const char* fieldName = fdesc_ptr->name()->as_C_string();
2596 *name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1);
2597 if (*name_ptr == NULL)
2598 return JVMTI_ERROR_OUT_OF_MEMORY;
2599 strcpy(*name_ptr, fieldName);
2600 }
2601 if (signature_ptr== NULL) {
2602 // just don't return the signature
2603 } else {
2604 const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
2605 *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
2606 if (*signature_ptr == NULL)
2607 return JVMTI_ERROR_OUT_OF_MEMORY;
2608 strcpy(*signature_ptr, fieldSignature);
2609 }
2610 if (generic_ptr != NULL) {
2611 *generic_ptr = NULL;
2612 Symbol* soop = fdesc_ptr->generic_signature();
2613 if (soop != NULL) {
2614 const char* gen_sig = soop->as_C_string();
2615 if (gen_sig != NULL) {
2616 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
2617 if (err != JVMTI_ERROR_NONE) {
2618 return err;
2619 }
2620 strcpy(*generic_ptr, gen_sig);
2621 }
2622 }
2623 }
2624 return JVMTI_ERROR_NONE;
2625 } /* end GetFieldName */
2626
2627
2628 // declaring_class_ptr - pre-checked for NULL
2629 jvmtiError
2630 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
2631
2632 *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
2633 return JVMTI_ERROR_NONE;
2634 } /* end GetFieldDeclaringClass */
2635
2636
2637 // modifiers_ptr - pre-checked for NULL
2638 jvmtiError
2639 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
2640
2641 AccessFlags resultFlags = fdesc_ptr->access_flags();
2642 jint result = resultFlags.as_int();
2643 *modifiers_ptr = result;
2644
2645 return JVMTI_ERROR_NONE;
2646 } /* end GetFieldModifiers */
2647
2648
2649 // is_synthetic_ptr - pre-checked for NULL
2650 jvmtiError
2651 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
2652 *is_synthetic_ptr = fdesc_ptr->is_synthetic();
2653 return JVMTI_ERROR_NONE;
2654 } /* end IsFieldSynthetic */
2655
2656
2657 //
2658 // Method functions
2659 //
2660
2661 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2662 // name_ptr - NULL is a valid value, must be checked
2663 // signature_ptr - NULL is a valid value, must be checked
2664 // generic_ptr - NULL is a valid value, must be checked
2665 jvmtiError
2666 JvmtiEnv::GetMethodName(Method* method_oop, char** name_ptr, char** signature_ptr, char** generic_ptr) {
2667 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2668 JavaThread* current_thread = JavaThread::current();
2669
2670 ResourceMark rm(current_thread); // get the utf8 name and signature
2671 if (name_ptr == NULL) {
2672 // just don't return the name
2673 } else {
2674 const char* utf8_name = (const char *) method_oop->name()->as_utf8();
2675 *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
2676 strcpy(*name_ptr, utf8_name);
2677 }
2678 if (signature_ptr == NULL) {
2679 // just don't return the signature
2680 } else {
2681 const char* utf8_signature = (const char *) method_oop->signature()->as_utf8();
2682 *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
2683 strcpy(*signature_ptr, utf8_signature);
2684 }
2685
2686 if (generic_ptr != NULL) {
2687 *generic_ptr = NULL;
2688 Symbol* soop = method_oop->generic_signature();
2689 if (soop != NULL) {
2690 const char* gen_sig = soop->as_C_string();
2691 if (gen_sig != NULL) {
2692 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
2693 if (err != JVMTI_ERROR_NONE) {
2694 return err;
2695 }
2696 strcpy(*generic_ptr, gen_sig);
2697 }
2698 }
2699 }
2700 return JVMTI_ERROR_NONE;
2701 } /* end GetMethodName */
2702
2703
2704 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2705 // declaring_class_ptr - pre-checked for NULL
2706 jvmtiError
2707 JvmtiEnv::GetMethodDeclaringClass(Method* method_oop, jclass* declaring_class_ptr) {
2708 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2709 (*declaring_class_ptr) = get_jni_class_non_null(method_oop->method_holder());
2710 return JVMTI_ERROR_NONE;
2711 } /* end GetMethodDeclaringClass */
2712
2713
2714 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2715 // modifiers_ptr - pre-checked for NULL
2716 jvmtiError
2717 JvmtiEnv::GetMethodModifiers(Method* method_oop, jint* modifiers_ptr) {
2718 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2719 (*modifiers_ptr) = method_oop->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2720 return JVMTI_ERROR_NONE;
2721 } /* end GetMethodModifiers */
2722
2723
2724 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2725 // max_ptr - pre-checked for NULL
2726 jvmtiError
2727 JvmtiEnv::GetMaxLocals(Method* method_oop, jint* max_ptr) {
2728 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2729 // get max stack
2730 (*max_ptr) = method_oop->max_locals();
2731 return JVMTI_ERROR_NONE;
2732 } /* end GetMaxLocals */
2733
2734
2735 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2736 // size_ptr - pre-checked for NULL
2737 jvmtiError
2738 JvmtiEnv::GetArgumentsSize(Method* method_oop, jint* size_ptr) {
2739 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2740 // get size of arguments
2741
2742 (*size_ptr) = method_oop->size_of_parameters();
2743 return JVMTI_ERROR_NONE;
2744 } /* end GetArgumentsSize */
2745
2746
2747 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2748 // entry_count_ptr - pre-checked for NULL
2749 // table_ptr - pre-checked for NULL
2750 jvmtiError
2751 JvmtiEnv::GetLineNumberTable(Method* method_oop, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
2752 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2753 if (!method_oop->has_linenumber_table()) {
2754 return (JVMTI_ERROR_ABSENT_INFORMATION);
2755 }
2756
2757 // The line number table is compressed so we don't know how big it is until decompressed.
2758 // Decompression is really fast so we just do it twice.
2759
2760 // Compute size of table
2761 jint num_entries = 0;
2762 CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table());
2763 while (stream.read_pair()) {
2764 num_entries++;
2765 }
2766 jvmtiLineNumberEntry *jvmti_table =
2767 (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
2768
2769 // Fill jvmti table
2770 if (num_entries > 0) {
2771 int index = 0;
2772 CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table());
2773 while (stream.read_pair()) {
2774 jvmti_table[index].start_location = (jlocation) stream.bci();
2775 jvmti_table[index].line_number = (jint) stream.line();
2776 index++;
2777 }
2778 assert(index == num_entries, "sanity check");
2779 }
2780
2781 // Set up results
2782 (*entry_count_ptr) = num_entries;
2783 (*table_ptr) = jvmti_table;
2784
2785 return JVMTI_ERROR_NONE;
2786 } /* end GetLineNumberTable */
2787
2788
2789 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2790 // start_location_ptr - pre-checked for NULL
2791 // end_location_ptr - pre-checked for NULL
2792 jvmtiError
2793 JvmtiEnv::GetMethodLocation(Method* method_oop, jlocation* start_location_ptr, jlocation* end_location_ptr) {
2794
2795 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2796 // get start and end location
2797 (*end_location_ptr) = (jlocation) (method_oop->code_size() - 1);
2798 if (method_oop->code_size() == 0) {
2799 // there is no code so there is no start location
2800 (*start_location_ptr) = (jlocation)(-1);
2801 } else {
2802 (*start_location_ptr) = (jlocation)(0);
2803 }
2804
2805 return JVMTI_ERROR_NONE;
2806 } /* end GetMethodLocation */
2807
2808
2809 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2810 // entry_count_ptr - pre-checked for NULL
2811 // table_ptr - pre-checked for NULL
2812 jvmtiError
2813 JvmtiEnv::GetLocalVariableTable(Method* method_oop, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
2814
2815 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2816 JavaThread* current_thread = JavaThread::current();
2817
2818 // does the klass have any local variable information?
2819 InstanceKlass* ik = method_oop->method_holder();
2820 if (!ik->access_flags().has_localvariable_table()) {
2821 return (JVMTI_ERROR_ABSENT_INFORMATION);
2822 }
2823
2824 ConstantPool* constants = method_oop->constants();
2825 NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
2826
2827 // in the vm localvariable table representation, 6 consecutive elements in the table
2828 // represent a 6-tuple of shorts
2829 // [start_pc, length, name_index, descriptor_index, signature_index, index]
2830 jint num_entries = method_oop->localvariable_table_length();
2831 jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
2832 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
2833
2834 if (num_entries > 0) {
2835 LocalVariableTableElement* table = method_oop->localvariable_table_start();
2836 for (int i = 0; i < num_entries; i++) {
2837 // get the 5 tuple information from the vm table
2838 jlocation start_location = (jlocation) table[i].start_bci;
2839 jint length = (jint) table[i].length;
2840 int name_index = (int) table[i].name_cp_index;
2841 int signature_index = (int) table[i].descriptor_cp_index;
2842 int generic_signature_index = (int) table[i].signature_cp_index;
2843 jint slot = (jint) table[i].slot;
2844
2845 // get utf8 name and signature
2846 char *name_buf = NULL;
2847 char *sig_buf = NULL;
2848 char *gen_sig_buf = NULL;
2849 {
2850 ResourceMark rm(current_thread);
2851
2852 const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
2853 name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
2854 strcpy(name_buf, utf8_name);
2855
2856 const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
2857 sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
2858 strcpy(sig_buf, utf8_signature);
2859
2860 if (generic_signature_index > 0) {
2861 const char *utf8_gen_sign = (const char *)
2862 constants->symbol_at(generic_signature_index)->as_utf8();
2863 gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
2864 strcpy(gen_sig_buf, utf8_gen_sign);
2865 }
2866 }
2867
2868 // fill in the jvmti local variable table
2869 jvmti_table[i].start_location = start_location;
2870 jvmti_table[i].length = length;
2871 jvmti_table[i].name = name_buf;
2872 jvmti_table[i].signature = sig_buf;
2873 jvmti_table[i].generic_signature = gen_sig_buf;
2874 jvmti_table[i].slot = slot;
2875 }
2876 }
2877
2878 // set results
2879 (*entry_count_ptr) = num_entries;
2880 (*table_ptr) = jvmti_table;
2881
2882 return JVMTI_ERROR_NONE;
2883 } /* end GetLocalVariableTable */
2884
2885
2886 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2887 // bytecode_count_ptr - pre-checked for NULL
2888 // bytecodes_ptr - pre-checked for NULL
2889 jvmtiError
2890 JvmtiEnv::GetBytecodes(Method* method_oop, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
2891 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2892
2893 HandleMark hm;
2894 methodHandle method(method_oop);
2895 jint size = (jint)method->code_size();
2896 jvmtiError err = allocate(size, bytecodes_ptr);
2897 if (err != JVMTI_ERROR_NONE) {
2898 return err;
2899 }
2900
2901 (*bytecode_count_ptr) = size;
2902 // get byte codes
2903 JvmtiClassFileReconstituter::copy_bytecodes(method, *bytecodes_ptr);
2904
2905 return JVMTI_ERROR_NONE;
2906 } /* end GetBytecodes */
2907
2908
2909 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2910 // is_native_ptr - pre-checked for NULL
2911 jvmtiError
2912 JvmtiEnv::IsMethodNative(Method* method_oop, jboolean* is_native_ptr) {
2913 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2914 (*is_native_ptr) = method_oop->is_native();
2915 return JVMTI_ERROR_NONE;
2916 } /* end IsMethodNative */
2917
2918
2919 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2920 // is_synthetic_ptr - pre-checked for NULL
2921 jvmtiError
2922 JvmtiEnv::IsMethodSynthetic(Method* method_oop, jboolean* is_synthetic_ptr) {
2923 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2924 (*is_synthetic_ptr) = method_oop->is_synthetic();
2925 return JVMTI_ERROR_NONE;
2926 } /* end IsMethodSynthetic */
2927
2928
2929 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2930 // is_obsolete_ptr - pre-checked for NULL
2931 jvmtiError
2932 JvmtiEnv::IsMethodObsolete(Method* method_oop, jboolean* is_obsolete_ptr) {
2933 if (use_version_1_0_semantics() &&
2934 get_capabilities()->can_redefine_classes == 0) {
2935 // This JvmtiEnv requested version 1.0 semantics and this function
2936 // requires the can_redefine_classes capability in version 1.0 so
2937 // we need to return an error here.
2938 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
2939 }
2940
2941 if (method_oop == NULL || method_oop->is_obsolete()) {
2942 *is_obsolete_ptr = true;
2943 } else {
2944 *is_obsolete_ptr = false;
2945 }
2946 return JVMTI_ERROR_NONE;
2947 } /* end IsMethodObsolete */
2948
2949 //
2950 // Raw Monitor functions
2951 //
2952
2953 // name - pre-checked for NULL
2954 // monitor_ptr - pre-checked for NULL
2955 jvmtiError
2956 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
2957 JvmtiRawMonitor* rmonitor = new JvmtiRawMonitor(name);
2958 NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
2959
2960 *monitor_ptr = (jrawMonitorID)rmonitor;
2961
2962 return JVMTI_ERROR_NONE;
2963 } /* end CreateRawMonitor */
2964
2965
2966 // rmonitor - pre-checked for validity
2967 jvmtiError
2968 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
2969 if (Threads::number_of_threads() == 0) {
2970 // Remove this monitor from pending raw monitors list
2971 // if it has entered in onload or start phase.
2972 JvmtiPendingMonitors::destroy(rmonitor);
2973 } else {
2974 Thread* thread = Thread::current();
2975 if (rmonitor->is_entered(thread)) {
2976 // The caller owns this monitor which we are about to destroy.
2977 // We exit the underlying synchronization object so that the
2978 // "delete monitor" call below can work without an assertion
2979 // failure on systems that don't like destroying synchronization
2980 // objects that are locked.
2981 int r;
2982 intptr_t recursion = rmonitor->recursions();
2983 for (intptr_t i = 0; i <= recursion; i++) {
2984 r = rmonitor->raw_exit(thread);
2985 assert(r == ObjectMonitor::OM_OK, "raw_exit should have worked");
2986 if (r != ObjectMonitor::OM_OK) { // robustness
2987 return JVMTI_ERROR_INTERNAL;
2988 }
2989 }
2990 }
2991 if (rmonitor->owner() != NULL) {
2992 // The caller is trying to destroy a monitor that is locked by
2993 // someone else. While this is not forbidden by the JVMTI
2994 // spec, it will cause an assertion failure on systems that don't
2995 // like destroying synchronization objects that are locked.
2996 // We indicate a problem with the error return (and leak the
2997 // monitor's memory).
2998 return JVMTI_ERROR_NOT_MONITOR_OWNER;
2999 }
3000 }
3001
3002 delete rmonitor;
3003
3004 return JVMTI_ERROR_NONE;
3005 } /* end DestroyRawMonitor */
3006
3007
3008 // rmonitor - pre-checked for validity
3009 jvmtiError
3010 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
3011 if (Threads::number_of_threads() == 0) {
3012 // No JavaThreads exist so ObjectMonitor enter cannot be
3013 // used, add this raw monitor to the pending list.
3014 // The pending monitors will be actually entered when
3015 // the VM is setup.
3016 // See transition_pending_raw_monitors in create_vm()
3017 // in thread.cpp.
3018 JvmtiPendingMonitors::enter(rmonitor);
3019 } else {
3020 int r = 0;
3021 Thread* thread = Thread::current();
3022
3023 if (thread->is_Java_thread()) {
3024 JavaThread* current_thread = (JavaThread*)thread;
3025
3026 #ifdef PROPER_TRANSITIONS
3027 // Not really unknown but ThreadInVMfromNative does more than we want
3028 ThreadInVMfromUnknown __tiv;
3029 {
3030 ThreadBlockInVM __tbivm(current_thread);
3031 r = rmonitor->raw_enter(current_thread);
3032 }
3033 #else
3034 /* Transition to thread_blocked without entering vm state */
3035 /* This is really evil. Normally you can't undo _thread_blocked */
3036 /* transitions like this because it would cause us to miss a */
3037 /* safepoint but since the thread was already in _thread_in_native */
3038 /* the thread is not leaving a safepoint safe state and it will */
3039 /* block when it tries to return from native. We can't safepoint */
3040 /* block in here because we could deadlock the vmthread. Blech. */
3041
3042 JavaThreadState state = current_thread->thread_state();
3043 assert(state == _thread_in_native, "Must be _thread_in_native");
3044 // frame should already be walkable since we are in native
3045 assert(!current_thread->has_last_Java_frame() ||
3046 current_thread->frame_anchor()->walkable(), "Must be walkable");
3047 current_thread->set_thread_state(_thread_blocked);
3048
3049 r = rmonitor->raw_enter(current_thread);
3050 // restore state, still at a safepoint safe state
3051 current_thread->set_thread_state(state);
3052
3053 #endif /* PROPER_TRANSITIONS */
3054 assert(r == ObjectMonitor::OM_OK, "raw_enter should have worked");
3055 } else {
3056 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3057 r = rmonitor->raw_enter(thread);
3058 } else {
3059 ShouldNotReachHere();
3060 }
3061 }
3062
3063 if (r != ObjectMonitor::OM_OK) { // robustness
3064 return JVMTI_ERROR_INTERNAL;
3065 }
3066 }
3067 return JVMTI_ERROR_NONE;
3068 } /* end RawMonitorEnter */
3069
3070
3071 // rmonitor - pre-checked for validity
3072 jvmtiError
3073 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
3074 jvmtiError err = JVMTI_ERROR_NONE;
3075
3076 if (Threads::number_of_threads() == 0) {
3077 // No JavaThreads exist so just remove this monitor from the pending list.
3078 // Bool value from exit is false if rmonitor is not in the list.
3079 if (!JvmtiPendingMonitors::exit(rmonitor)) {
3080 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3081 }
3082 } else {
3083 int r = 0;
3084 Thread* thread = Thread::current();
3085
3086 if (thread->is_Java_thread()) {
3087 JavaThread* current_thread = (JavaThread*)thread;
3088 #ifdef PROPER_TRANSITIONS
3089 // Not really unknown but ThreadInVMfromNative does more than we want
3090 ThreadInVMfromUnknown __tiv;
3091 #endif /* PROPER_TRANSITIONS */
3092 r = rmonitor->raw_exit(current_thread);
3093 } else {
3094 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3095 r = rmonitor->raw_exit(thread);
3096 } else {
3097 ShouldNotReachHere();
3098 }
3099 }
3100
3101 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) {
3102 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3103 } else {
3104 assert(r == ObjectMonitor::OM_OK, "raw_exit should have worked");
3105 if (r != ObjectMonitor::OM_OK) { // robustness
3106 err = JVMTI_ERROR_INTERNAL;
3107 }
3108 }
3109 }
3110 return err;
3111 } /* end RawMonitorExit */
3112
3113
3114 // rmonitor - pre-checked for validity
3115 jvmtiError
3116 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
3117 int r = 0;
3118 Thread* thread = Thread::current();
3119
3120 if (thread->is_Java_thread()) {
3121 JavaThread* current_thread = (JavaThread*)thread;
3122 #ifdef PROPER_TRANSITIONS
3123 // Not really unknown but ThreadInVMfromNative does more than we want
3124 ThreadInVMfromUnknown __tiv;
3125 {
3126 ThreadBlockInVM __tbivm(current_thread);
3127 r = rmonitor->raw_wait(millis, true, current_thread);
3128 }
3129 #else
3130 /* Transition to thread_blocked without entering vm state */
3131 /* This is really evil. Normally you can't undo _thread_blocked */
3132 /* transitions like this because it would cause us to miss a */
3133 /* safepoint but since the thread was already in _thread_in_native */
3134 /* the thread is not leaving a safepoint safe state and it will */
3135 /* block when it tries to return from native. We can't safepoint */
3136 /* block in here because we could deadlock the vmthread. Blech. */
3137
3138 JavaThreadState state = current_thread->thread_state();
3139 assert(state == _thread_in_native, "Must be _thread_in_native");
3140 // frame should already be walkable since we are in native
3141 assert(!current_thread->has_last_Java_frame() ||
3142 current_thread->frame_anchor()->walkable(), "Must be walkable");
3143 current_thread->set_thread_state(_thread_blocked);
3144
3145 r = rmonitor->raw_wait(millis, true, current_thread);
3146 // restore state, still at a safepoint safe state
3147 current_thread->set_thread_state(state);
3148
3149 #endif /* PROPER_TRANSITIONS */
3150 } else {
3151 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3152 r = rmonitor->raw_wait(millis, true, thread);
3153 } else {
3154 ShouldNotReachHere();
3155 }
3156 }
3157
3158 switch (r) {
3159 case ObjectMonitor::OM_INTERRUPTED:
3160 return JVMTI_ERROR_INTERRUPT;
3161 case ObjectMonitor::OM_ILLEGAL_MONITOR_STATE:
3162 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3163 }
3164 assert(r == ObjectMonitor::OM_OK, "raw_wait should have worked");
3165 if (r != ObjectMonitor::OM_OK) { // robustness
3166 return JVMTI_ERROR_INTERNAL;
3167 }
3168
3169 return JVMTI_ERROR_NONE;
3170 } /* end RawMonitorWait */
3171
3172
3173 // rmonitor - pre-checked for validity
3174 jvmtiError
3175 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
3176 int r = 0;
3177 Thread* thread = Thread::current();
3178
3179 if (thread->is_Java_thread()) {
3180 JavaThread* current_thread = (JavaThread*)thread;
3181 // Not really unknown but ThreadInVMfromNative does more than we want
3182 ThreadInVMfromUnknown __tiv;
3183 r = rmonitor->raw_notify(current_thread);
3184 } else {
3185 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3186 r = rmonitor->raw_notify(thread);
3187 } else {
3188 ShouldNotReachHere();
3189 }
3190 }
3191
3192 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) {
3193 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3194 }
3195 assert(r == ObjectMonitor::OM_OK, "raw_notify should have worked");
3196 if (r != ObjectMonitor::OM_OK) { // robustness
3197 return JVMTI_ERROR_INTERNAL;
3198 }
3199
3200 return JVMTI_ERROR_NONE;
3201 } /* end RawMonitorNotify */
3202
3203
3204 // rmonitor - pre-checked for validity
3205 jvmtiError
3206 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
3207 int r = 0;
3208 Thread* thread = Thread::current();
3209
3210 if (thread->is_Java_thread()) {
3211 JavaThread* current_thread = (JavaThread*)thread;
3212 ThreadInVMfromUnknown __tiv;
3213 r = rmonitor->raw_notifyAll(current_thread);
3214 } else {
3215 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3216 r = rmonitor->raw_notifyAll(thread);
3217 } else {
3218 ShouldNotReachHere();
3219 }
3220 }
3221
3222 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) {
3223 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3224 }
3225 assert(r == ObjectMonitor::OM_OK, "raw_notifyAll should have worked");
3226 if (r != ObjectMonitor::OM_OK) { // robustness
3227 return JVMTI_ERROR_INTERNAL;
3228 }
3229
3230 return JVMTI_ERROR_NONE;
3231 } /* end RawMonitorNotifyAll */
3232
3233
3234 //
3235 // JNI Function Interception functions
3236 //
3237
3238
3239 // function_table - pre-checked for NULL
3240 jvmtiError
3241 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
3242 // Copy jni function table at safepoint.
3243 VM_JNIFunctionTableCopier copier(function_table);
3244 VMThread::execute(&copier);
3245
3246 return JVMTI_ERROR_NONE;
3247 } /* end SetJNIFunctionTable */
3248
3249
3250 // function_table - pre-checked for NULL
3251 jvmtiError
3252 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
3253 *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
3254 if (*function_table == NULL)
3255 return JVMTI_ERROR_OUT_OF_MEMORY;
3256 memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
3257 return JVMTI_ERROR_NONE;
3258 } /* end GetJNIFunctionTable */
3259
3260
3261 //
3262 // Event Management functions
3263 //
3264
3265 jvmtiError
3266 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
3267 // can only generate two event types
3268 if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
3269 event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
3270 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3271 }
3272
3273 // for compiled_method_load events we must check that the environment
3274 // has the can_generate_compiled_method_load_events capability.
3275 if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
3276 if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
3277 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3278 }
3279 return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
3280 } else {
3281 return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
3282 }
3283
3284 } /* end GenerateEvents */
3285
3286
3287 //
3288 // Extension Mechanism functions
3289 //
3290
3291 // extension_count_ptr - pre-checked for NULL
3292 // extensions - pre-checked for NULL
3293 jvmtiError
3294 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
3295 return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
3296 } /* end GetExtensionFunctions */
3297
3298
3299 // extension_count_ptr - pre-checked for NULL
3300 // extensions - pre-checked for NULL
3301 jvmtiError
3302 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
3303 return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
3304 } /* end GetExtensionEvents */
3305
3306
3307 // callback - NULL is a valid value, must be checked
3308 jvmtiError
3309 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
3310 return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
3311 } /* end SetExtensionEventCallback */
3312
3313 //
3314 // Timers functions
3315 //
3316
3317 // info_ptr - pre-checked for NULL
3318 jvmtiError
3319 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3320 os::current_thread_cpu_time_info(info_ptr);
3321 return JVMTI_ERROR_NONE;
3322 } /* end GetCurrentThreadCpuTimerInfo */
3323
3324
3325 // nanos_ptr - pre-checked for NULL
3326 jvmtiError
3327 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
3328 *nanos_ptr = os::current_thread_cpu_time();
3329 return JVMTI_ERROR_NONE;
3330 } /* end GetCurrentThreadCpuTime */
3331
3332
3333 // info_ptr - pre-checked for NULL
3334 jvmtiError
3335 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3336 os::thread_cpu_time_info(info_ptr);
3337 return JVMTI_ERROR_NONE;
3338 } /* end GetThreadCpuTimerInfo */
3339
3340
3341 // Threads_lock NOT held, java_thread not protected by lock
3342 // java_thread - pre-checked
3343 // nanos_ptr - pre-checked for NULL
3344 jvmtiError
3345 JvmtiEnv::GetThreadCpuTime(JavaThread* java_thread, jlong* nanos_ptr) {
3346 *nanos_ptr = os::thread_cpu_time(java_thread);
3347 return JVMTI_ERROR_NONE;
3348 } /* end GetThreadCpuTime */
3349
3350
3351 // info_ptr - pre-checked for NULL
3352 jvmtiError
3353 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
3354 os::javaTimeNanos_info(info_ptr);
3355 return JVMTI_ERROR_NONE;
3356 } /* end GetTimerInfo */
3357
3358
3359 // nanos_ptr - pre-checked for NULL
3360 jvmtiError
3361 JvmtiEnv::GetTime(jlong* nanos_ptr) {
3362 *nanos_ptr = os::javaTimeNanos();
3363 return JVMTI_ERROR_NONE;
3364 } /* end GetTime */
3365
3366
3367 // processor_count_ptr - pre-checked for NULL
3368 jvmtiError
3369 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
3370 *processor_count_ptr = os::active_processor_count();
3371 return JVMTI_ERROR_NONE;
3372 } /* end GetAvailableProcessors */
3373
3374 //
3375 // System Properties functions
3376 //
3377
3378 // count_ptr - pre-checked for NULL
3379 // property_ptr - pre-checked for NULL
3380 jvmtiError
3381 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
3382 jvmtiError err = JVMTI_ERROR_NONE;
3383
3384 *count_ptr = Arguments::PropertyList_count(Arguments::system_properties());
3385
3386 err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
3387 if (err != JVMTI_ERROR_NONE) {
3388 return err;
3389 }
3390 int i = 0 ;
3391 for (SystemProperty* p = Arguments::system_properties(); p != NULL && i < *count_ptr; p = p->next(), i++) {
3392 const char *key = p->key();
3393 char **tmp_value = *property_ptr+i;
3394 err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
3395 if (err == JVMTI_ERROR_NONE) {
3396 strcpy(*tmp_value, key);
3397 } else {
3398 // clean up previously allocated memory.
3399 for (int j = 0; j < i; j++) {
3400 Deallocate((unsigned char*)*property_ptr+j);
3401 }
3402 Deallocate((unsigned char*)property_ptr);
3403 break;
3404 }
3405 }
3406 return err;
3407 } /* end GetSystemProperties */
3408
3409
3410 // property - pre-checked for NULL
3411 // value_ptr - pre-checked for NULL
3412 jvmtiError
3413 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
3414 jvmtiError err = JVMTI_ERROR_NONE;
3415 const char *value;
3416
3417 value = Arguments::PropertyList_get_value(Arguments::system_properties(), property);
3418 if (value == NULL) {
3419 err = JVMTI_ERROR_NOT_AVAILABLE;
3420 } else {
3421 err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
3422 if (err == JVMTI_ERROR_NONE) {
3423 strcpy(*value_ptr, value);
3424 }
3425 }
3426 return err;
3427 } /* end GetSystemProperty */
3428
3429
3430 // property - pre-checked for NULL
3431 // value - NULL is a valid value, must be checked
3432 jvmtiError
3433 JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) {
3434 jvmtiError err =JVMTI_ERROR_NOT_AVAILABLE;
3435
3436 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
3437 if (strcmp(property, p->key()) == 0) {
3438 if (p->set_value((char *)value_ptr)) {
3439 err = JVMTI_ERROR_NONE;
3440 }
3441 }
3442 }
3443 return err;
3444 } /* end SetSystemProperty */