1 /*
2 * Copyright (c) 2003, 2013, 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/systemDictionary.hpp"
27 #include "classfile/vmSymbols.hpp"
28 #include "interpreter/bytecodeStream.hpp"
29 #include "interpreter/interpreter.hpp"
30 #include "jvmtifiles/jvmtiEnv.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "memory/universe.inline.hpp"
33 #include "oops/instanceKlass.hpp"
34 #include "prims/jniCheck.hpp"
35 #include "prims/jvm_misc.hpp"
36 #include "prims/jvmtiAgentThread.hpp"
37 #include "prims/jvmtiClassFileReconstituter.hpp"
38 #include "prims/jvmtiCodeBlobEvents.hpp"
39 #include "prims/jvmtiExtensions.hpp"
40 #include "prims/jvmtiGetLoadedClasses.hpp"
41 #include "prims/jvmtiImpl.hpp"
42 #include "prims/jvmtiManageCapabilities.hpp"
43 #include "prims/jvmtiRawMonitor.hpp"
44 #include "prims/jvmtiRedefineClasses.hpp"
45 #include "prims/jvmtiTagMap.hpp"
46 #include "prims/jvmtiThreadState.inline.hpp"
47 #include "prims/jvmtiUtil.hpp"
48 #include "runtime/arguments.hpp"
49 #include "runtime/deoptimization.hpp"
50 #include "runtime/interfaceSupport.hpp"
51 #include "runtime/javaCalls.hpp"
52 #include "runtime/jfieldIDWorkaround.hpp"
53 #include "runtime/osThread.hpp"
54 #include "runtime/reflectionUtils.hpp"
55 #include "runtime/signature.hpp"
56 #include "runtime/thread.inline.hpp"
57 #include "runtime/vframe.hpp"
58 #include "runtime/vmThread.hpp"
59 #include "services/threadService.hpp"
60 #include "utilities/exceptions.hpp"
61 #include "utilities/preserveException.hpp"
62
63
64 #define FIXLATER 0 // REMOVE this when completed.
65
66 // FIXLATER: hook into JvmtiTrace
67 #define TraceJVMTICalls false
68
69 JvmtiEnv::JvmtiEnv(jint version) : JvmtiEnvBase(version) {
70 }
71
72 JvmtiEnv::~JvmtiEnv() {
73 }
74
75 JvmtiEnv*
76 JvmtiEnv::create_a_jvmti(jint version) {
77 return new JvmtiEnv(version);
78 }
79
80 // VM operation class to copy jni function table at safepoint.
81 // More than one java threads or jvmti agents may be reading/
82 // modifying jni function tables. To reduce the risk of bad
83 // interaction b/w these threads it is copied at safepoint.
84 class VM_JNIFunctionTableCopier : public VM_Operation {
85 private:
86 const struct JNINativeInterface_ *_function_table;
87 public:
88 VM_JNIFunctionTableCopier(const struct JNINativeInterface_ *func_tbl) {
89 _function_table = func_tbl;
90 };
91
92 VMOp_Type type() const { return VMOp_JNIFunctionTableCopier; }
93 void doit() {
94 copy_jni_function_table(_function_table);
95 };
96 };
97
98 //
99 // Do not change the "prefix" marker below, everything above it is copied
100 // unchanged into the filled stub, everything below is controlled by the
101 // stub filler (only method bodies are carried forward, and then only for
102 // functionality still in the spec).
103 //
104 // end file prefix
105
106 //
107 // Memory Management functions
108 //
109
110 // mem_ptr - pre-checked for NULL
111 jvmtiError
112 JvmtiEnv::Allocate(jlong size, unsigned char** mem_ptr) {
113 return allocate(size, mem_ptr);
114 } /* end Allocate */
115
116
117 // mem - NULL is a valid value, must be checked
118 jvmtiError
119 JvmtiEnv::Deallocate(unsigned char* mem) {
120 return deallocate(mem);
121 } /* end Deallocate */
122
123 // Threads_lock NOT held, java_thread not protected by lock
124 // java_thread - pre-checked
125 // data - NULL is a valid value, must be checked
126 jvmtiError
127 JvmtiEnv::SetThreadLocalStorage(JavaThread* java_thread, const void* data) {
128 JvmtiThreadState* state = java_thread->jvmti_thread_state();
129 if (state == NULL) {
130 if (data == NULL) {
131 // leaving state unset same as data set to NULL
132 return JVMTI_ERROR_NONE;
133 }
134 // otherwise, create the state
135 state = JvmtiThreadState::state_for(java_thread);
136 if (state == NULL) {
137 return JVMTI_ERROR_THREAD_NOT_ALIVE;
138 }
139 }
140 state->env_thread_state(this)->set_agent_thread_local_storage_data((void*)data);
141 return JVMTI_ERROR_NONE;
142 } /* end SetThreadLocalStorage */
143
144
145 // Threads_lock NOT held
146 // thread - NOT pre-checked
147 // data_ptr - pre-checked for NULL
148 jvmtiError
149 JvmtiEnv::GetThreadLocalStorage(jthread thread, void** data_ptr) {
150 JavaThread* current_thread = JavaThread::current();
151 if (thread == NULL) {
152 JvmtiThreadState* state = current_thread->jvmti_thread_state();
153 *data_ptr = (state == NULL) ? NULL :
154 state->env_thread_state(this)->get_agent_thread_local_storage_data();
155 } else {
156
157 // jvmti_GetThreadLocalStorage is "in native" and doesn't transition
158 // the thread to _thread_in_vm. However, when the TLS for a thread
159 // other than the current thread is required we need to transition
160 // from native so as to resolve the jthread.
161
162 ThreadInVMfromNative __tiv(current_thread);
163 VM_ENTRY_BASE(jvmtiError, JvmtiEnv::GetThreadLocalStorage , current_thread)
164 debug_only(VMNativeEntryWrapper __vew;)
165
166 oop thread_oop = JNIHandles::resolve_external_guard(thread);
167 if (thread_oop == NULL) {
168 return JVMTI_ERROR_INVALID_THREAD;
169 }
170 if (!thread_oop->is_a(SystemDictionary::Thread_klass())) {
171 return JVMTI_ERROR_INVALID_THREAD;
172 }
173 JavaThread* java_thread = java_lang_Thread::thread(thread_oop);
174 if (java_thread == NULL) {
175 return JVMTI_ERROR_THREAD_NOT_ALIVE;
176 }
177 JvmtiThreadState* state = java_thread->jvmti_thread_state();
178 *data_ptr = (state == NULL) ? NULL :
179 state->env_thread_state(this)->get_agent_thread_local_storage_data();
180 }
181 return JVMTI_ERROR_NONE;
182 } /* end GetThreadLocalStorage */
183
184 //
185 // Class functions
186 //
187
188 // class_count_ptr - pre-checked for NULL
189 // classes_ptr - pre-checked for NULL
190 jvmtiError
191 JvmtiEnv::GetLoadedClasses(jint* class_count_ptr, jclass** classes_ptr) {
192 return JvmtiGetLoadedClasses::getLoadedClasses(this, class_count_ptr, classes_ptr);
193 } /* end GetLoadedClasses */
194
195
196 // initiating_loader - NULL is a valid value, must be checked
197 // class_count_ptr - pre-checked for NULL
198 // classes_ptr - pre-checked for NULL
199 jvmtiError
200 JvmtiEnv::GetClassLoaderClasses(jobject initiating_loader, jint* class_count_ptr, jclass** classes_ptr) {
201 return JvmtiGetLoadedClasses::getClassLoaderClasses(this, initiating_loader,
202 class_count_ptr, classes_ptr);
203 } /* end GetClassLoaderClasses */
204
205 // k_mirror - may be primitive, this must be checked
206 // is_modifiable_class_ptr - pre-checked for NULL
207 jvmtiError
208 JvmtiEnv::IsModifiableClass(oop k_mirror, jboolean* is_modifiable_class_ptr) {
209 *is_modifiable_class_ptr = VM_RedefineClasses::is_modifiable_class(k_mirror)?
210 JNI_TRUE : JNI_FALSE;
211 return JVMTI_ERROR_NONE;
212 } /* end IsModifiableClass */
213
214 // class_count - pre-checked to be greater than or equal to 0
215 // classes - pre-checked for NULL
216 jvmtiError
217 JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
218 //TODO: add locking
219
220 int index;
221 JavaThread* current_thread = JavaThread::current();
222 ResourceMark rm(current_thread);
223
224 jvmtiClassDefinition* class_definitions =
225 NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count);
226 NULL_CHECK(class_definitions, JVMTI_ERROR_OUT_OF_MEMORY);
227
228 for (index = 0; index < class_count; index++) {
229 HandleMark hm(current_thread);
230
231 jclass jcls = classes[index];
232 oop k_mirror = JNIHandles::resolve_external_guard(jcls);
233 if (k_mirror == NULL) {
234 return JVMTI_ERROR_INVALID_CLASS;
235 }
236 if (!k_mirror->is_a(SystemDictionary::Class_klass())) {
237 return JVMTI_ERROR_INVALID_CLASS;
238 }
239
240 if (java_lang_Class::is_primitive(k_mirror)) {
241 return JVMTI_ERROR_UNMODIFIABLE_CLASS;
242 }
243
244 Klass* k_oop = java_lang_Class::as_Klass(k_mirror);
245 KlassHandle klass(current_thread, k_oop);
246
247 jint status = klass->jvmti_class_status();
248 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
249 return JVMTI_ERROR_INVALID_CLASS;
250 }
251 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
252 return JVMTI_ERROR_UNMODIFIABLE_CLASS;
253 }
254
255 instanceKlassHandle ikh(current_thread, k_oop);
256 if (ikh->get_cached_class_file_bytes() == NULL) {
257 // Not cached, we need to reconstitute the class file from the
258 // VM representation. We don't attach the reconstituted class
259 // bytes to the InstanceKlass here because they have not been
260 // validated and we're not at a safepoint.
261 constantPoolHandle constants(current_thread, ikh->constants());
262 oop cplock = constants->lock();
263 ObjectLocker ol(cplock, current_thread, cplock != NULL); // 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 = k->size() * wordSize;
312 } else {
313 *size_ptr = 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 ClassLoader::add_to_list(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 typeArrayHandle name;
950 ThreadPriority priority;
951 Handle thread_group;
952 Handle context_class_loader;
953 bool is_daemon;
954
955 { MutexLocker mu(Threads_lock);
956
957 name = typeArrayHandle(current_thread, java_lang_Thread::name(thread_obj()));
958 priority = java_lang_Thread::priority(thread_obj());
959 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
960 is_daemon = java_lang_Thread::is_daemon(thread_obj());
961
962 oop loader = java_lang_Thread::context_class_loader(thread_obj());
963 context_class_loader = Handle(current_thread, loader);
964 }
965 { const char *n;
966
967 if (name() != NULL) {
968 n = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
969 } else {
970 n = UNICODE::as_utf8(NULL, 0);
971 }
972
973 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
974 if (info_ptr->name == NULL)
975 return JVMTI_ERROR_OUT_OF_MEMORY;
976
977 strcpy(info_ptr->name, n);
978 }
979 info_ptr->is_daemon = is_daemon;
980 info_ptr->priority = priority;
981
982 info_ptr->context_class_loader = (context_class_loader.is_null()) ? NULL :
983 jni_reference(context_class_loader);
984 info_ptr->thread_group = jni_reference(thread_group);
985
986 return JVMTI_ERROR_NONE;
987 } /* end GetThreadInfo */
988
989
990 // Threads_lock NOT held, java_thread not protected by lock
991 // java_thread - pre-checked
992 // owned_monitor_count_ptr - pre-checked for NULL
993 // owned_monitors_ptr - pre-checked for NULL
994 jvmtiError
995 JvmtiEnv::GetOwnedMonitorInfo(JavaThread* java_thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
996 jvmtiError err = JVMTI_ERROR_NONE;
997 JavaThread* calling_thread = JavaThread::current();
998
999 // growable array of jvmti monitors info on the C-heap
1000 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1001 new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true);
1002
1003 uint32_t debug_bits = 0;
1004 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
1005 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1006 } else {
1007 // JVMTI get monitors info at safepoint. Do not require target thread to
1008 // be suspended.
1009 VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list);
1010 VMThread::execute(&op);
1011 err = op.result();
1012 }
1013 jint owned_monitor_count = owned_monitors_list->length();
1014 if (err == JVMTI_ERROR_NONE) {
1015 if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1016 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1017 // copy into the returned array
1018 for (int i = 0; i < owned_monitor_count; i++) {
1019 (*owned_monitors_ptr)[i] =
1020 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1021 }
1022 *owned_monitor_count_ptr = owned_monitor_count;
1023 }
1024 }
1025 // clean up.
1026 for (int i = 0; i < owned_monitor_count; i++) {
1027 deallocate((unsigned char*)owned_monitors_list->at(i));
1028 }
1029 delete owned_monitors_list;
1030
1031 return err;
1032 } /* end GetOwnedMonitorInfo */
1033
1034
1035 // Threads_lock NOT held, java_thread not protected by lock
1036 // java_thread - pre-checked
1037 // monitor_info_count_ptr - pre-checked for NULL
1038 // monitor_info_ptr - pre-checked for NULL
1039 jvmtiError
1040 JvmtiEnv::GetOwnedMonitorStackDepthInfo(JavaThread* java_thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1041 jvmtiError err = JVMTI_ERROR_NONE;
1042 JavaThread* calling_thread = JavaThread::current();
1043
1044 // growable array of jvmti monitors info on the C-heap
1045 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1046 new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true);
1047
1048 uint32_t debug_bits = 0;
1049 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
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 uint32_t debug_bits = 0;
1091 JavaThread* calling_thread = JavaThread::current();
1092 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
1093 err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr);
1094 } else {
1095 // get contended monitor information at safepoint.
1096 VM_GetCurrentContendedMonitor op(this, calling_thread, java_thread, monitor_ptr);
1097 VMThread::execute(&op);
1098 err = op.result();
1099 }
1100 return err;
1101 } /* end GetCurrentContendedMonitor */
1102
1103
1104 // Threads_lock NOT held
1105 // thread - NOT pre-checked
1106 // proc - pre-checked for NULL
1107 // arg - NULL is a valid value, must be checked
1108 jvmtiError
1109 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1110 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1111 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) {
1112 return JVMTI_ERROR_INVALID_THREAD;
1113 }
1114 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1115 return JVMTI_ERROR_INVALID_PRIORITY;
1116 }
1117
1118 //Thread-self
1119 JavaThread* current_thread = JavaThread::current();
1120
1121 Handle thread_hndl(current_thread, thread_oop);
1122 {
1123 MutexLocker mu(Threads_lock); // grab Threads_lock
1124
1125 JvmtiAgentThread *new_thread = new JvmtiAgentThread(this, proc, arg);
1126
1127 // At this point it may be possible that no osthread was created for the
1128 // JavaThread due to lack of memory.
1129 if (new_thread == NULL || new_thread->osthread() == NULL) {
1130 if (new_thread) delete new_thread;
1131 return JVMTI_ERROR_OUT_OF_MEMORY;
1132 }
1133
1134 java_lang_Thread::set_thread(thread_hndl(), new_thread);
1135 java_lang_Thread::set_priority(thread_hndl(), (ThreadPriority)priority);
1136 java_lang_Thread::set_daemon(thread_hndl());
1137
1138 new_thread->set_threadObj(thread_hndl());
1139 Threads::add(new_thread);
1140 Thread::start(new_thread);
1141 } // unlock Threads_lock
1142
1143 return JVMTI_ERROR_NONE;
1144 } /* end RunAgentThread */
1145
1146 //
1147 // Thread Group functions
1148 //
1149
1150 // group_count_ptr - pre-checked for NULL
1151 // groups_ptr - pre-checked for NULL
1152 jvmtiError
1153 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1154 JavaThread* current_thread = JavaThread::current();
1155
1156 // Only one top level thread group now.
1157 *group_count_ptr = 1;
1158
1159 // Allocate memory to store global-refs to the thread groups.
1160 // Assume this area is freed by caller.
1161 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1162
1163 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1164
1165 // Convert oop to Handle, then convert Handle to global-ref.
1166 {
1167 HandleMark hm(current_thread);
1168 Handle system_thread_group(current_thread, Universe::system_thread_group());
1169 *groups_ptr[0] = jni_reference(system_thread_group);
1170 }
1171
1172 return JVMTI_ERROR_NONE;
1173 } /* end GetTopThreadGroups */
1174
1175
1176 // info_ptr - pre-checked for NULL
1177 jvmtiError
1178 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1179 ResourceMark rm;
1180 HandleMark hm;
1181
1182 JavaThread* current_thread = JavaThread::current();
1183
1184 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1185 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1186
1187 typeArrayHandle name;
1188 Handle parent_group;
1189 bool is_daemon;
1190 ThreadPriority max_priority;
1191
1192 { MutexLocker mu(Threads_lock);
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
1201 info_ptr->is_daemon = is_daemon;
1202 info_ptr->max_priority = max_priority;
1203 info_ptr->parent = jni_reference(parent_group);
1204
1205 if (name() != NULL) {
1206 const char* n = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
1207 info_ptr->name = (char *)jvmtiMalloc(strlen(n)+1);
1208 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1209 strcpy(info_ptr->name, n);
1210 } else {
1211 info_ptr->name = NULL;
1212 }
1213
1214 return JVMTI_ERROR_NONE;
1215 } /* end GetThreadGroupInfo */
1216
1217
1218 // thread_count_ptr - pre-checked for NULL
1219 // threads_ptr - pre-checked for NULL
1220 // group_count_ptr - pre-checked for NULL
1221 // groups_ptr - pre-checked for NULL
1222 jvmtiError
1223 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1224 JavaThread* current_thread = JavaThread::current();
1225 oop group_obj = (oop) JNIHandles::resolve_external_guard(group);
1226 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1227
1228 Handle *thread_objs = NULL;
1229 Handle *group_objs = NULL;
1230 int nthreads = 0;
1231 int ngroups = 0;
1232 int hidden_threads = 0;
1233
1234 ResourceMark rm;
1235 HandleMark hm;
1236
1237 Handle group_hdl(current_thread, group_obj);
1238
1239 { MutexLocker mu(Threads_lock);
1240
1241 nthreads = java_lang_ThreadGroup::nthreads(group_hdl());
1242 ngroups = java_lang_ThreadGroup::ngroups(group_hdl());
1243
1244 if (nthreads > 0) {
1245 objArrayOop threads = java_lang_ThreadGroup::threads(group_hdl());
1246 assert(nthreads <= threads->length(), "too many threads");
1247 thread_objs = NEW_RESOURCE_ARRAY(Handle,nthreads);
1248 for (int i=0, j=0; i<nthreads; i++) {
1249 oop thread_obj = threads->obj_at(i);
1250 assert(thread_obj != NULL, "thread_obj is NULL");
1251 JavaThread *javathread = java_lang_Thread::thread(thread_obj);
1252 // Filter out hidden java threads.
1253 if (javathread != NULL && javathread->is_hidden_from_external_view()) {
1254 hidden_threads++;
1255 continue;
1256 }
1257 thread_objs[j++] = Handle(current_thread, thread_obj);
1258 }
1259 nthreads -= hidden_threads;
1260 }
1261 if (ngroups > 0) {
1262 objArrayOop groups = java_lang_ThreadGroup::groups(group_hdl());
1263 assert(ngroups <= groups->length(), "too many threads");
1264 group_objs = NEW_RESOURCE_ARRAY(Handle,ngroups);
1265 for (int i=0; i<ngroups; i++) {
1266 oop group_obj = groups->obj_at(i);
1267 assert(group_obj != NULL, "group_obj != NULL");
1268 group_objs[i] = Handle(current_thread, group_obj);
1269 }
1270 }
1271 }
1272
1273 // have to make global handles outside of Threads_lock
1274 *group_count_ptr = ngroups;
1275 *thread_count_ptr = nthreads;
1276 *threads_ptr = new_jthreadArray(nthreads, thread_objs);
1277 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs);
1278 if ((nthreads > 0) && (*threads_ptr == NULL)) {
1279 return JVMTI_ERROR_OUT_OF_MEMORY;
1280 }
1281 if ((ngroups > 0) && (*groups_ptr == NULL)) {
1282 return JVMTI_ERROR_OUT_OF_MEMORY;
1283 }
1284
1285 return JVMTI_ERROR_NONE;
1286 } /* end GetThreadGroupChildren */
1287
1288
1289 //
1290 // Stack Frame functions
1291 //
1292
1293 // Threads_lock NOT held, java_thread not protected by lock
1294 // java_thread - pre-checked
1295 // max_frame_count - pre-checked to be greater than or equal to 0
1296 // frame_buffer - pre-checked for NULL
1297 // count_ptr - pre-checked for NULL
1298 jvmtiError
1299 JvmtiEnv::GetStackTrace(JavaThread* java_thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1300 jvmtiError err = JVMTI_ERROR_NONE;
1301 uint32_t debug_bits = 0;
1302 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
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 Thread *thread = Thread::current();
1625 HandleMark hm(thread);
1626 KlassHandle kh (thread, k_oop);
1627
1628 TraceTime t("FollowReferences", TraceJVMTIObjectTagging);
1629 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, kh, initial_object, callbacks, user_data);
1630 return JVMTI_ERROR_NONE;
1631 } /* end FollowReferences */
1632
1633
1634 // klass - NULL is a valid value, must be checked
1635 // callbacks - pre-checked for NULL
1636 // user_data - NULL is a valid value, must be checked
1637 jvmtiError
1638 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1639 // check klass if provided
1640 Klass* k_oop = NULL;
1641 if (klass != NULL) {
1642 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1643 if (k_mirror == NULL) {
1644 return JVMTI_ERROR_INVALID_CLASS;
1645 }
1646 if (java_lang_Class::is_primitive(k_mirror)) {
1647 return JVMTI_ERROR_NONE;
1648 }
1649 k_oop = java_lang_Class::as_Klass(k_mirror);
1650 if (k_oop == NULL) {
1651 return JVMTI_ERROR_INVALID_CLASS;
1652 }
1653 }
1654
1655 Thread *thread = Thread::current();
1656 HandleMark hm(thread);
1657 KlassHandle kh (thread, k_oop);
1658
1659 TraceTime t("IterateThroughHeap", TraceJVMTIObjectTagging);
1660 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, kh, callbacks, user_data);
1661 return JVMTI_ERROR_NONE;
1662 } /* end IterateThroughHeap */
1663
1664
1665 // tag_ptr - pre-checked for NULL
1666 jvmtiError
1667 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
1668 oop o = JNIHandles::resolve_external_guard(object);
1669 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1670 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
1671 return JVMTI_ERROR_NONE;
1672 } /* end GetTag */
1673
1674
1675 jvmtiError
1676 JvmtiEnv::SetTag(jobject object, jlong tag) {
1677 oop o = JNIHandles::resolve_external_guard(object);
1678 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1679 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
1680 return JVMTI_ERROR_NONE;
1681 } /* end SetTag */
1682
1683
1684 // tag_count - pre-checked to be greater than or equal to 0
1685 // tags - pre-checked for NULL
1686 // count_ptr - pre-checked for NULL
1687 // object_result_ptr - NULL is a valid value, must be checked
1688 // tag_result_ptr - NULL is a valid value, must be checked
1689 jvmtiError
1690 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
1691 TraceTime t("GetObjectsWithTags", TraceJVMTIObjectTagging);
1692 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
1693 } /* end GetObjectsWithTags */
1694
1695
1696 jvmtiError
1697 JvmtiEnv::ForceGarbageCollection() {
1698 Universe::heap()->collect(GCCause::_jvmti_force_gc);
1699 return JVMTI_ERROR_NONE;
1700 } /* end ForceGarbageCollection */
1701
1702
1703 //
1704 // Heap (1.0) functions
1705 //
1706
1707 // object_reference_callback - pre-checked for NULL
1708 // user_data - NULL is a valid value, must be checked
1709 jvmtiError
1710 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
1711 oop o = JNIHandles::resolve_external_guard(object);
1712 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1713 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
1714 return JVMTI_ERROR_NONE;
1715 } /* end IterateOverObjectsReachableFromObject */
1716
1717
1718 // heap_root_callback - NULL is a valid value, must be checked
1719 // stack_ref_callback - NULL is a valid value, must be checked
1720 // object_ref_callback - NULL is a valid value, must be checked
1721 // user_data - NULL is a valid value, must be checked
1722 jvmtiError
1723 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
1724 TraceTime t("IterateOverReachableObjects", TraceJVMTIObjectTagging);
1725 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
1726 return JVMTI_ERROR_NONE;
1727 } /* end IterateOverReachableObjects */
1728
1729
1730 // heap_object_callback - pre-checked for NULL
1731 // user_data - NULL is a valid value, must be checked
1732 jvmtiError
1733 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
1734 TraceTime t("IterateOverHeap", TraceJVMTIObjectTagging);
1735 Thread *thread = Thread::current();
1736 HandleMark hm(thread);
1737 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, KlassHandle(), heap_object_callback, user_data);
1738 return JVMTI_ERROR_NONE;
1739 } /* end IterateOverHeap */
1740
1741
1742 // k_mirror - may be primitive, this must be checked
1743 // heap_object_callback - pre-checked for NULL
1744 // user_data - NULL is a valid value, must be checked
1745 jvmtiError
1746 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
1747 if (java_lang_Class::is_primitive(k_mirror)) {
1748 // DO PRIMITIVE CLASS PROCESSING
1749 return JVMTI_ERROR_NONE;
1750 }
1751 Klass* k_oop = java_lang_Class::as_Klass(k_mirror);
1752 if (k_oop == NULL) {
1753 return JVMTI_ERROR_INVALID_CLASS;
1754 }
1755 Thread *thread = Thread::current();
1756 HandleMark hm(thread);
1757 KlassHandle klass (thread, k_oop);
1758 TraceTime t("IterateOverInstancesOfClass", TraceJVMTIObjectTagging);
1759 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
1760 return JVMTI_ERROR_NONE;
1761 } /* end IterateOverInstancesOfClass */
1762
1763
1764 //
1765 // Local Variable functions
1766 //
1767
1768 // Threads_lock NOT held, java_thread not protected by lock
1769 // java_thread - pre-checked
1770 // java_thread - unchecked
1771 // depth - pre-checked as non-negative
1772 // value_ptr - pre-checked for NULL
1773 jvmtiError
1774 JvmtiEnv::GetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject* value_ptr) {
1775 JavaThread* current_thread = JavaThread::current();
1776 // rm object is created to clean up the javaVFrame created in
1777 // doit_prologue(), but after doit() is finished with it.
1778 ResourceMark rm(current_thread);
1779
1780 VM_GetOrSetLocal op(java_thread, current_thread, depth, slot);
1781 VMThread::execute(&op);
1782 jvmtiError err = op.result();
1783 if (err != JVMTI_ERROR_NONE) {
1784 return err;
1785 } else {
1786 *value_ptr = op.value().l;
1787 return JVMTI_ERROR_NONE;
1788 }
1789 } /* end GetLocalObject */
1790
1791 // Threads_lock NOT held, java_thread not protected by lock
1792 // java_thread - pre-checked
1793 // java_thread - unchecked
1794 // depth - pre-checked as non-negative
1795 // value - pre-checked for NULL
1796 jvmtiError
1797 JvmtiEnv::GetLocalInstance(JavaThread* java_thread, jint depth, jobject* value_ptr){
1798 JavaThread* current_thread = JavaThread::current();
1799 // rm object is created to clean up the javaVFrame created in
1800 // doit_prologue(), but after doit() is finished with it.
1801 ResourceMark rm(current_thread);
1802
1803 VM_GetReceiver op(java_thread, current_thread, depth);
1804 VMThread::execute(&op);
1805 jvmtiError err = op.result();
1806 if (err != JVMTI_ERROR_NONE) {
1807 return err;
1808 } else {
1809 *value_ptr = op.value().l;
1810 return JVMTI_ERROR_NONE;
1811 }
1812 } /* end GetLocalInstance */
1813
1814
1815 // Threads_lock NOT held, java_thread not protected by lock
1816 // java_thread - pre-checked
1817 // java_thread - unchecked
1818 // depth - pre-checked as non-negative
1819 // value_ptr - pre-checked for NULL
1820 jvmtiError
1821 JvmtiEnv::GetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint* value_ptr) {
1822 // rm object is created to clean up the javaVFrame created in
1823 // doit_prologue(), but after doit() is finished with it.
1824 ResourceMark rm;
1825
1826 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT);
1827 VMThread::execute(&op);
1828 *value_ptr = op.value().i;
1829 return op.result();
1830 } /* end GetLocalInt */
1831
1832
1833 // Threads_lock NOT held, java_thread not protected by lock
1834 // java_thread - pre-checked
1835 // java_thread - unchecked
1836 // depth - pre-checked as non-negative
1837 // value_ptr - pre-checked for NULL
1838 jvmtiError
1839 JvmtiEnv::GetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong* value_ptr) {
1840 // rm object is created to clean up the javaVFrame created in
1841 // doit_prologue(), but after doit() is finished with it.
1842 ResourceMark rm;
1843
1844 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG);
1845 VMThread::execute(&op);
1846 *value_ptr = op.value().j;
1847 return op.result();
1848 } /* end GetLocalLong */
1849
1850
1851 // Threads_lock NOT held, java_thread not protected by lock
1852 // java_thread - pre-checked
1853 // java_thread - unchecked
1854 // depth - pre-checked as non-negative
1855 // value_ptr - pre-checked for NULL
1856 jvmtiError
1857 JvmtiEnv::GetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat* value_ptr) {
1858 // rm object is created to clean up the javaVFrame created in
1859 // doit_prologue(), but after doit() is finished with it.
1860 ResourceMark rm;
1861
1862 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT);
1863 VMThread::execute(&op);
1864 *value_ptr = op.value().f;
1865 return op.result();
1866 } /* end GetLocalFloat */
1867
1868
1869 // Threads_lock NOT held, java_thread not protected by lock
1870 // java_thread - pre-checked
1871 // java_thread - unchecked
1872 // depth - pre-checked as non-negative
1873 // value_ptr - pre-checked for NULL
1874 jvmtiError
1875 JvmtiEnv::GetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble* value_ptr) {
1876 // rm object is created to clean up the javaVFrame created in
1877 // doit_prologue(), but after doit() is finished with it.
1878 ResourceMark rm;
1879
1880 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE);
1881 VMThread::execute(&op);
1882 *value_ptr = op.value().d;
1883 return op.result();
1884 } /* end GetLocalDouble */
1885
1886
1887 // Threads_lock NOT held, java_thread not protected by lock
1888 // java_thread - pre-checked
1889 // java_thread - unchecked
1890 // depth - pre-checked as non-negative
1891 jvmtiError
1892 JvmtiEnv::SetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject value) {
1893 // rm object is created to clean up the javaVFrame created in
1894 // doit_prologue(), but after doit() is finished with it.
1895 ResourceMark rm;
1896 jvalue val;
1897 val.l = value;
1898 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val);
1899 VMThread::execute(&op);
1900 return op.result();
1901 } /* end SetLocalObject */
1902
1903
1904 // Threads_lock NOT held, java_thread not protected by lock
1905 // java_thread - pre-checked
1906 // java_thread - unchecked
1907 // depth - pre-checked as non-negative
1908 jvmtiError
1909 JvmtiEnv::SetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint value) {
1910 // rm object is created to clean up the javaVFrame created in
1911 // doit_prologue(), but after doit() is finished with it.
1912 ResourceMark rm;
1913 jvalue val;
1914 val.i = value;
1915 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val);
1916 VMThread::execute(&op);
1917 return op.result();
1918 } /* end SetLocalInt */
1919
1920
1921 // Threads_lock NOT held, java_thread not protected by lock
1922 // java_thread - pre-checked
1923 // java_thread - unchecked
1924 // depth - pre-checked as non-negative
1925 jvmtiError
1926 JvmtiEnv::SetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong value) {
1927 // rm object is created to clean up the javaVFrame created in
1928 // doit_prologue(), but after doit() is finished with it.
1929 ResourceMark rm;
1930 jvalue val;
1931 val.j = value;
1932 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val);
1933 VMThread::execute(&op);
1934 return op.result();
1935 } /* end SetLocalLong */
1936
1937
1938 // Threads_lock NOT held, java_thread not protected by lock
1939 // java_thread - pre-checked
1940 // java_thread - unchecked
1941 // depth - pre-checked as non-negative
1942 jvmtiError
1943 JvmtiEnv::SetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat value) {
1944 // rm object is created to clean up the javaVFrame created in
1945 // doit_prologue(), but after doit() is finished with it.
1946 ResourceMark rm;
1947 jvalue val;
1948 val.f = value;
1949 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val);
1950 VMThread::execute(&op);
1951 return op.result();
1952 } /* end SetLocalFloat */
1953
1954
1955 // Threads_lock NOT held, java_thread not protected by lock
1956 // java_thread - pre-checked
1957 // java_thread - unchecked
1958 // depth - pre-checked as non-negative
1959 jvmtiError
1960 JvmtiEnv::SetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble value) {
1961 // rm object is created to clean up the javaVFrame created in
1962 // doit_prologue(), but after doit() is finished with it.
1963 ResourceMark rm;
1964 jvalue val;
1965 val.d = value;
1966 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val);
1967 VMThread::execute(&op);
1968 return op.result();
1969 } /* end SetLocalDouble */
1970
1971
1972 //
1973 // Breakpoint functions
1974 //
1975
1976 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
1977 jvmtiError
1978 JvmtiEnv::SetBreakpoint(Method* method_oop, jlocation location) {
1979 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
1980 if (location < 0) { // simple invalid location check first
1981 return JVMTI_ERROR_INVALID_LOCATION;
1982 }
1983 // verify that the breakpoint is not past the end of the method
1984 if (location >= (jlocation) method_oop->code_size()) {
1985 return JVMTI_ERROR_INVALID_LOCATION;
1986 }
1987
1988 HandleMark hm;
1989 JvmtiBreakpoint bp(method_oop, location);
1990 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
1991 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
1992 return JVMTI_ERROR_DUPLICATE;
1993
1994 if (TraceJVMTICalls) {
1995 jvmti_breakpoints.print();
1996 }
1997
1998 return JVMTI_ERROR_NONE;
1999 } /* end SetBreakpoint */
2000
2001
2002 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2003 jvmtiError
2004 JvmtiEnv::ClearBreakpoint(Method* method_oop, jlocation location) {
2005 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2006 if (location < 0) { // simple invalid location check first
2007 return JVMTI_ERROR_INVALID_LOCATION;
2008 }
2009 // verify that the breakpoint is not past the end of the method
2010 if (location >= (jlocation) method_oop->code_size()) {
2011 return JVMTI_ERROR_INVALID_LOCATION;
2012 }
2013
2014 HandleMark hm;
2015 JvmtiBreakpoint bp(method_oop, location);
2016 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2017 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2018 return JVMTI_ERROR_NOT_FOUND;
2019
2020 if (TraceJVMTICalls) {
2021 jvmti_breakpoints.print();
2022 }
2023
2024 return JVMTI_ERROR_NONE;
2025 } /* end ClearBreakpoint */
2026
2027
2028 //
2029 // Watched Field functions
2030 //
2031
2032 jvmtiError
2033 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2034 // make sure we haven't set this watch before
2035 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2036 fdesc_ptr->set_is_field_access_watched(true);
2037
2038 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2039
2040 return JVMTI_ERROR_NONE;
2041 } /* end SetFieldAccessWatch */
2042
2043
2044 jvmtiError
2045 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2046 // make sure we have a watch to clear
2047 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2048 fdesc_ptr->set_is_field_access_watched(false);
2049
2050 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2051
2052 return JVMTI_ERROR_NONE;
2053 } /* end ClearFieldAccessWatch */
2054
2055
2056 jvmtiError
2057 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2058 // make sure we haven't set this watch before
2059 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2060 fdesc_ptr->set_is_field_modification_watched(true);
2061
2062 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2063
2064 return JVMTI_ERROR_NONE;
2065 } /* end SetFieldModificationWatch */
2066
2067
2068 jvmtiError
2069 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2070 // make sure we have a watch to clear
2071 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2072 fdesc_ptr->set_is_field_modification_watched(false);
2073
2074 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2075
2076 return JVMTI_ERROR_NONE;
2077 } /* end ClearFieldModificationWatch */
2078
2079 //
2080 // Class functions
2081 //
2082
2083
2084 // k_mirror - may be primitive, this must be checked
2085 // signature_ptr - NULL is a valid value, must be checked
2086 // generic_ptr - NULL is a valid value, must be checked
2087 jvmtiError
2088 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2089 ResourceMark rm;
2090 bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2091 Klass* k = NULL;
2092 if (!isPrimitive) {
2093 k = java_lang_Class::as_Klass(k_mirror);
2094 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2095 }
2096 if (signature_ptr != NULL) {
2097 char* result = NULL;
2098 if (isPrimitive) {
2099 char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2100 result = (char*) jvmtiMalloc(2);
2101 result[0] = tchar;
2102 result[1] = '\0';
2103 } else {
2104 const char* class_sig = k->signature_name();
2105 result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2106 strcpy(result, class_sig);
2107 }
2108 *signature_ptr = result;
2109 }
2110 if (generic_ptr != NULL) {
2111 *generic_ptr = NULL;
2112 if (!isPrimitive && k->oop_is_instance()) {
2113 Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2114 if (soo != NULL) {
2115 const char *gen_sig = soo->as_C_string();
2116 if (gen_sig != NULL) {
2117 char* gen_result;
2118 jvmtiError err = allocate(strlen(gen_sig) + 1,
2119 (unsigned char **)&gen_result);
2120 if (err != JVMTI_ERROR_NONE) {
2121 return err;
2122 }
2123 strcpy(gen_result, gen_sig);
2124 *generic_ptr = gen_result;
2125 }
2126 }
2127 }
2128 }
2129 return JVMTI_ERROR_NONE;
2130 } /* end GetClassSignature */
2131
2132
2133 // k_mirror - may be primitive, this must be checked
2134 // status_ptr - pre-checked for NULL
2135 jvmtiError
2136 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2137 jint result = 0;
2138 if (java_lang_Class::is_primitive(k_mirror)) {
2139 result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2140 } else {
2141 Klass* k = java_lang_Class::as_Klass(k_mirror);
2142 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2143 result = k->jvmti_class_status();
2144 }
2145 *status_ptr = result;
2146
2147 return JVMTI_ERROR_NONE;
2148 } /* end GetClassStatus */
2149
2150
2151 // k_mirror - may be primitive, this must be checked
2152 // source_name_ptr - pre-checked for NULL
2153 jvmtiError
2154 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2155 if (java_lang_Class::is_primitive(k_mirror)) {
2156 return JVMTI_ERROR_ABSENT_INFORMATION;
2157 }
2158 Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2159 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2160
2161 if (!k_klass->oop_is_instance()) {
2162 return JVMTI_ERROR_ABSENT_INFORMATION;
2163 }
2164
2165 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2166 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2167 {
2168 JavaThread* current_thread = JavaThread::current();
2169 ResourceMark rm(current_thread);
2170 const char* sfncp = (const char*) sfnOop->as_C_string();
2171 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2172 strcpy(*source_name_ptr, sfncp);
2173 }
2174
2175 return JVMTI_ERROR_NONE;
2176 } /* end GetSourceFileName */
2177
2178
2179 // k_mirror - may be primitive, this must be checked
2180 // modifiers_ptr - pre-checked for NULL
2181 jvmtiError
2182 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2183 JavaThread* current_thread = JavaThread::current();
2184 jint result = 0;
2185 if (!java_lang_Class::is_primitive(k_mirror)) {
2186 Klass* k = java_lang_Class::as_Klass(k_mirror);
2187 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2188 result = k->compute_modifier_flags(current_thread);
2189 JavaThread* THREAD = current_thread; // pass to macros
2190 if (HAS_PENDING_EXCEPTION) {
2191 CLEAR_PENDING_EXCEPTION;
2192 return JVMTI_ERROR_INTERNAL;
2193 };
2194
2195 // Reset the deleted ACC_SUPER bit ( deleted in compute_modifier_flags()).
2196 if(k->is_super()) {
2197 result |= JVM_ACC_SUPER;
2198 }
2199 } else {
2200 result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
2201 }
2202 *modifiers_ptr = result;
2203
2204 return JVMTI_ERROR_NONE;
2205 } /* end GetClassModifiers */
2206
2207
2208 // k_mirror - may be primitive, this must be checked
2209 // method_count_ptr - pre-checked for NULL
2210 // methods_ptr - pre-checked for NULL
2211 jvmtiError
2212 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2213 JavaThread* current_thread = JavaThread::current();
2214 HandleMark hm(current_thread);
2215
2216 if (java_lang_Class::is_primitive(k_mirror)) {
2217 *method_count_ptr = 0;
2218 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2219 return JVMTI_ERROR_NONE;
2220 }
2221 Klass* k = java_lang_Class::as_Klass(k_mirror);
2222 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2223
2224 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2225 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2226 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2227 }
2228
2229 if (!k->oop_is_instance()) {
2230 *method_count_ptr = 0;
2231 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2232 return JVMTI_ERROR_NONE;
2233 }
2234 instanceKlassHandle instanceK_h(current_thread, k);
2235 // Allocate the result and fill it in
2236 int result_length = instanceK_h->methods()->length();
2237 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2238 int index;
2239 if (JvmtiExport::can_maintain_original_method_order()) {
2240 // Use the original method ordering indices stored in the class, so we can emit
2241 // jmethodIDs in the order they appeared in the class file
2242 for (index = 0; index < result_length; index++) {
2243 Method* m = instanceK_h->methods()->at(index);
2244 int original_index = instanceK_h->method_ordering()->at(index);
2245 assert(original_index >= 0 && original_index < result_length, "invalid original method index");
2246 jmethodID id = m->jmethod_id();
2247 result_list[original_index] = id;
2248 }
2249 } else {
2250 // otherwise just copy in any order
2251 for (index = 0; index < result_length; index++) {
2252 Method* m = instanceK_h->methods()->at(index);
2253 jmethodID id = m->jmethod_id();
2254 result_list[index] = id;
2255 }
2256 }
2257 // Fill in return value.
2258 *method_count_ptr = result_length;
2259 *methods_ptr = result_list;
2260
2261 return JVMTI_ERROR_NONE;
2262 } /* end GetClassMethods */
2263
2264
2265 // k_mirror - may be primitive, this must be checked
2266 // field_count_ptr - pre-checked for NULL
2267 // fields_ptr - pre-checked for NULL
2268 jvmtiError
2269 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2270 if (java_lang_Class::is_primitive(k_mirror)) {
2271 *field_count_ptr = 0;
2272 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2273 return JVMTI_ERROR_NONE;
2274 }
2275 JavaThread* current_thread = JavaThread::current();
2276 HandleMark hm(current_thread);
2277 Klass* k = java_lang_Class::as_Klass(k_mirror);
2278 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2279
2280 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2281 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2282 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2283 }
2284
2285 if (!k->oop_is_instance()) {
2286 *field_count_ptr = 0;
2287 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2288 return JVMTI_ERROR_NONE;
2289 }
2290
2291
2292 instanceKlassHandle instanceK_h(current_thread, k);
2293
2294 int result_count = 0;
2295 // First, count the fields.
2296 FilteredFieldStream flds(instanceK_h, true, true);
2297 result_count = flds.field_count();
2298
2299 // Allocate the result and fill it in
2300 jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID));
2301 // The JVMTI spec requires fields in the order they occur in the class file,
2302 // this is the reverse order of what FieldStream hands out.
2303 int id_index = (result_count - 1);
2304
2305 for (FilteredFieldStream src_st(instanceK_h, true, true); !src_st.eos(); src_st.next()) {
2306 result_list[id_index--] = jfieldIDWorkaround::to_jfieldID(
2307 instanceK_h, src_st.offset(),
2308 src_st.access_flags().is_static());
2309 }
2310 assert(id_index == -1, "just checking");
2311 // Fill in the results
2312 *field_count_ptr = result_count;
2313 *fields_ptr = result_list;
2314
2315 return JVMTI_ERROR_NONE;
2316 } /* end GetClassFields */
2317
2318
2319 // k_mirror - may be primitive, this must be checked
2320 // interface_count_ptr - pre-checked for NULL
2321 // interfaces_ptr - pre-checked for NULL
2322 jvmtiError
2323 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
2324 {
2325 if (java_lang_Class::is_primitive(k_mirror)) {
2326 *interface_count_ptr = 0;
2327 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2328 return JVMTI_ERROR_NONE;
2329 }
2330 JavaThread* current_thread = JavaThread::current();
2331 HandleMark hm(current_thread);
2332 Klass* k = java_lang_Class::as_Klass(k_mirror);
2333 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2334
2335 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2336 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
2337 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2338
2339 if (!k->oop_is_instance()) {
2340 *interface_count_ptr = 0;
2341 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2342 return JVMTI_ERROR_NONE;
2343 }
2344
2345 Array<Klass*>* interface_list = InstanceKlass::cast(k)->local_interfaces();
2346 const int result_length = (interface_list == NULL ? 0 : interface_list->length());
2347 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
2348 for (int i_index = 0; i_index < result_length; i_index += 1) {
2349 Klass* klass_at = interface_list->at(i_index);
2350 assert(klass_at->is_klass(), "interfaces must be Klass*s");
2351 assert(klass_at->is_interface(), "interfaces must be interfaces");
2352 oop mirror_at = klass_at->java_mirror();
2353 Handle handle_at = Handle(current_thread, mirror_at);
2354 result_list[i_index] = (jclass) jni_reference(handle_at);
2355 }
2356 *interface_count_ptr = result_length;
2357 *interfaces_ptr = result_list;
2358 }
2359
2360 return JVMTI_ERROR_NONE;
2361 } /* end GetImplementedInterfaces */
2362
2363
2364 // k_mirror - may be primitive, this must be checked
2365 // minor_version_ptr - pre-checked for NULL
2366 // major_version_ptr - pre-checked for NULL
2367 jvmtiError
2368 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
2369 if (java_lang_Class::is_primitive(k_mirror)) {
2370 return JVMTI_ERROR_ABSENT_INFORMATION;
2371 }
2372 Klass* k_oop = java_lang_Class::as_Klass(k_mirror);
2373 Thread *thread = Thread::current();
2374 HandleMark hm(thread);
2375 KlassHandle klass(thread, k_oop);
2376
2377 jint status = klass->jvmti_class_status();
2378 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2379 return JVMTI_ERROR_INVALID_CLASS;
2380 }
2381 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2382 return JVMTI_ERROR_ABSENT_INFORMATION;
2383 }
2384
2385 instanceKlassHandle ik(thread, k_oop);
2386 *minor_version_ptr = ik->minor_version();
2387 *major_version_ptr = ik->major_version();
2388
2389 return JVMTI_ERROR_NONE;
2390 } /* end GetClassVersionNumbers */
2391
2392
2393 // k_mirror - may be primitive, this must be checked
2394 // constant_pool_count_ptr - pre-checked for NULL
2395 // constant_pool_byte_count_ptr - pre-checked for NULL
2396 // constant_pool_bytes_ptr - pre-checked for NULL
2397 jvmtiError
2398 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
2399 if (java_lang_Class::is_primitive(k_mirror)) {
2400 return JVMTI_ERROR_ABSENT_INFORMATION;
2401 }
2402
2403 Klass* k_oop = java_lang_Class::as_Klass(k_mirror);
2404 Thread *thread = Thread::current();
2405 HandleMark hm(thread);
2406 ResourceMark rm(thread);
2407 KlassHandle klass(thread, k_oop);
2408
2409 jint status = klass->jvmti_class_status();
2410 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2411 return JVMTI_ERROR_INVALID_CLASS;
2412 }
2413 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2414 return JVMTI_ERROR_ABSENT_INFORMATION;
2415 }
2416
2417 instanceKlassHandle ikh(thread, k_oop);
2418 constantPoolHandle constants(thread, ikh->constants());
2419 oop cplock = constants->lock();
2420 ObjectLocker ol(cplock, thread, cplock != NULL); // lock constant pool while we query it
2421
2422 JvmtiConstantPoolReconstituter reconstituter(ikh);
2423 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2424 return reconstituter.get_error();
2425 }
2426
2427 unsigned char *cpool_bytes;
2428 int cpool_size = reconstituter.cpool_size();
2429 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2430 return reconstituter.get_error();
2431 }
2432 jvmtiError res = allocate(cpool_size, &cpool_bytes);
2433 if (res != JVMTI_ERROR_NONE) {
2434 return res;
2435 }
2436 reconstituter.copy_cpool_bytes(cpool_bytes);
2437 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2438 return reconstituter.get_error();
2439 }
2440
2441 *constant_pool_count_ptr = constants->length();
2442 *constant_pool_byte_count_ptr = cpool_size;
2443 *constant_pool_bytes_ptr = cpool_bytes;
2444
2445 return JVMTI_ERROR_NONE;
2446 } /* end GetConstantPool */
2447
2448
2449 // k_mirror - may be primitive, this must be checked
2450 // is_interface_ptr - pre-checked for NULL
2451 jvmtiError
2452 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
2453 {
2454 bool result = false;
2455 if (!java_lang_Class::is_primitive(k_mirror)) {
2456 Klass* k = java_lang_Class::as_Klass(k_mirror);
2457 if (k != NULL && k->is_interface()) {
2458 result = true;
2459 }
2460 }
2461 *is_interface_ptr = result;
2462 }
2463
2464 return JVMTI_ERROR_NONE;
2465 } /* end IsInterface */
2466
2467
2468 // k_mirror - may be primitive, this must be checked
2469 // is_array_class_ptr - pre-checked for NULL
2470 jvmtiError
2471 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
2472 {
2473 bool result = false;
2474 if (!java_lang_Class::is_primitive(k_mirror)) {
2475 Klass* k = java_lang_Class::as_Klass(k_mirror);
2476 if (k != NULL && k->oop_is_array()) {
2477 result = true;
2478 }
2479 }
2480 *is_array_class_ptr = result;
2481 }
2482
2483 return JVMTI_ERROR_NONE;
2484 } /* end IsArrayClass */
2485
2486
2487 // k_mirror - may be primitive, this must be checked
2488 // classloader_ptr - pre-checked for NULL
2489 jvmtiError
2490 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
2491 {
2492 if (java_lang_Class::is_primitive(k_mirror)) {
2493 *classloader_ptr = (jclass) jni_reference(Handle());
2494 return JVMTI_ERROR_NONE;
2495 }
2496 JavaThread* current_thread = JavaThread::current();
2497 HandleMark hm(current_thread);
2498 Klass* k = java_lang_Class::as_Klass(k_mirror);
2499 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2500
2501 oop result_oop = k->class_loader();
2502 if (result_oop == NULL) {
2503 *classloader_ptr = (jclass) jni_reference(Handle());
2504 return JVMTI_ERROR_NONE;
2505 }
2506 Handle result_handle = Handle(current_thread, result_oop);
2507 jclass result_jnihandle = (jclass) jni_reference(result_handle);
2508 *classloader_ptr = result_jnihandle;
2509 }
2510 return JVMTI_ERROR_NONE;
2511 } /* end GetClassLoader */
2512
2513
2514 // k_mirror - may be primitive, this must be checked
2515 // source_debug_extension_ptr - pre-checked for NULL
2516 jvmtiError
2517 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
2518 {
2519 if (java_lang_Class::is_primitive(k_mirror)) {
2520 return JVMTI_ERROR_ABSENT_INFORMATION;
2521 }
2522 Klass* k = java_lang_Class::as_Klass(k_mirror);
2523 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2524 if (!k->oop_is_instance()) {
2525 return JVMTI_ERROR_ABSENT_INFORMATION;
2526 }
2527 char* sde = InstanceKlass::cast(k)->source_debug_extension();
2528 NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
2529
2530 {
2531 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
2532 strcpy(*source_debug_extension_ptr, sde);
2533 }
2534 }
2535
2536 return JVMTI_ERROR_NONE;
2537 } /* end GetSourceDebugExtension */
2538
2539 //
2540 // Object functions
2541 //
2542
2543 // hash_code_ptr - pre-checked for NULL
2544 jvmtiError
2545 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
2546 oop mirror = JNIHandles::resolve_external_guard(object);
2547 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
2548 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
2549
2550 {
2551 jint result = (jint) mirror->identity_hash();
2552 *hash_code_ptr = result;
2553 }
2554 return JVMTI_ERROR_NONE;
2555 } /* end GetObjectHashCode */
2556
2557
2558 // info_ptr - pre-checked for NULL
2559 jvmtiError
2560 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
2561 JavaThread* calling_thread = JavaThread::current();
2562 jvmtiError err = get_object_monitor_usage(calling_thread, object, info_ptr);
2563 if (err == JVMTI_ERROR_THREAD_NOT_SUSPENDED) {
2564 // Some of the critical threads were not suspended. go to a safepoint and try again
2565 VM_GetObjectMonitorUsage op(this, calling_thread, object, info_ptr);
2566 VMThread::execute(&op);
2567 err = op.result();
2568 }
2569 return err;
2570 } /* end GetObjectMonitorUsage */
2571
2572
2573 //
2574 // Field functions
2575 //
2576
2577 // name_ptr - NULL is a valid value, must be checked
2578 // signature_ptr - NULL is a valid value, must be checked
2579 // generic_ptr - NULL is a valid value, must be checked
2580 jvmtiError
2581 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
2582 JavaThread* current_thread = JavaThread::current();
2583 ResourceMark rm(current_thread);
2584 if (name_ptr == NULL) {
2585 // just don't return the name
2586 } else {
2587 const char* fieldName = fdesc_ptr->name()->as_C_string();
2588 *name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1);
2589 if (*name_ptr == NULL)
2590 return JVMTI_ERROR_OUT_OF_MEMORY;
2591 strcpy(*name_ptr, fieldName);
2592 }
2593 if (signature_ptr== NULL) {
2594 // just don't return the signature
2595 } else {
2596 const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
2597 *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
2598 if (*signature_ptr == NULL)
2599 return JVMTI_ERROR_OUT_OF_MEMORY;
2600 strcpy(*signature_ptr, fieldSignature);
2601 }
2602 if (generic_ptr != NULL) {
2603 *generic_ptr = NULL;
2604 Symbol* soop = fdesc_ptr->generic_signature();
2605 if (soop != NULL) {
2606 const char* gen_sig = soop->as_C_string();
2607 if (gen_sig != NULL) {
2608 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
2609 if (err != JVMTI_ERROR_NONE) {
2610 return err;
2611 }
2612 strcpy(*generic_ptr, gen_sig);
2613 }
2614 }
2615 }
2616 return JVMTI_ERROR_NONE;
2617 } /* end GetFieldName */
2618
2619
2620 // declaring_class_ptr - pre-checked for NULL
2621 jvmtiError
2622 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
2623
2624 *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
2625 return JVMTI_ERROR_NONE;
2626 } /* end GetFieldDeclaringClass */
2627
2628
2629 // modifiers_ptr - pre-checked for NULL
2630 jvmtiError
2631 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
2632
2633 AccessFlags resultFlags = fdesc_ptr->access_flags();
2634 jint result = resultFlags.as_int();
2635 *modifiers_ptr = result;
2636
2637 return JVMTI_ERROR_NONE;
2638 } /* end GetFieldModifiers */
2639
2640
2641 // is_synthetic_ptr - pre-checked for NULL
2642 jvmtiError
2643 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
2644 *is_synthetic_ptr = fdesc_ptr->is_synthetic();
2645 return JVMTI_ERROR_NONE;
2646 } /* end IsFieldSynthetic */
2647
2648
2649 //
2650 // Method functions
2651 //
2652
2653 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2654 // name_ptr - NULL is a valid value, must be checked
2655 // signature_ptr - NULL is a valid value, must be checked
2656 // generic_ptr - NULL is a valid value, must be checked
2657 jvmtiError
2658 JvmtiEnv::GetMethodName(Method* method_oop, char** name_ptr, char** signature_ptr, char** generic_ptr) {
2659 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2660 JavaThread* current_thread = JavaThread::current();
2661
2662 ResourceMark rm(current_thread); // get the utf8 name and signature
2663 if (name_ptr == NULL) {
2664 // just don't return the name
2665 } else {
2666 const char* utf8_name = (const char *) method_oop->name()->as_utf8();
2667 *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
2668 strcpy(*name_ptr, utf8_name);
2669 }
2670 if (signature_ptr == NULL) {
2671 // just don't return the signature
2672 } else {
2673 const char* utf8_signature = (const char *) method_oop->signature()->as_utf8();
2674 *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
2675 strcpy(*signature_ptr, utf8_signature);
2676 }
2677
2678 if (generic_ptr != NULL) {
2679 *generic_ptr = NULL;
2680 Symbol* soop = method_oop->generic_signature();
2681 if (soop != NULL) {
2682 const char* gen_sig = soop->as_C_string();
2683 if (gen_sig != NULL) {
2684 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
2685 if (err != JVMTI_ERROR_NONE) {
2686 return err;
2687 }
2688 strcpy(*generic_ptr, gen_sig);
2689 }
2690 }
2691 }
2692 return JVMTI_ERROR_NONE;
2693 } /* end GetMethodName */
2694
2695
2696 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2697 // declaring_class_ptr - pre-checked for NULL
2698 jvmtiError
2699 JvmtiEnv::GetMethodDeclaringClass(Method* method_oop, jclass* declaring_class_ptr) {
2700 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2701 (*declaring_class_ptr) = get_jni_class_non_null(method_oop->method_holder());
2702 return JVMTI_ERROR_NONE;
2703 } /* end GetMethodDeclaringClass */
2704
2705
2706 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2707 // modifiers_ptr - pre-checked for NULL
2708 jvmtiError
2709 JvmtiEnv::GetMethodModifiers(Method* method_oop, jint* modifiers_ptr) {
2710 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2711 (*modifiers_ptr) = method_oop->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2712 return JVMTI_ERROR_NONE;
2713 } /* end GetMethodModifiers */
2714
2715
2716 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2717 // max_ptr - pre-checked for NULL
2718 jvmtiError
2719 JvmtiEnv::GetMaxLocals(Method* method_oop, jint* max_ptr) {
2720 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2721 // get max stack
2722 (*max_ptr) = method_oop->max_locals();
2723 return JVMTI_ERROR_NONE;
2724 } /* end GetMaxLocals */
2725
2726
2727 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2728 // size_ptr - pre-checked for NULL
2729 jvmtiError
2730 JvmtiEnv::GetArgumentsSize(Method* method_oop, jint* size_ptr) {
2731 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2732 // get size of arguments
2733
2734 (*size_ptr) = method_oop->size_of_parameters();
2735 return JVMTI_ERROR_NONE;
2736 } /* end GetArgumentsSize */
2737
2738
2739 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2740 // entry_count_ptr - pre-checked for NULL
2741 // table_ptr - pre-checked for NULL
2742 jvmtiError
2743 JvmtiEnv::GetLineNumberTable(Method* method_oop, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
2744 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2745 if (!method_oop->has_linenumber_table()) {
2746 return (JVMTI_ERROR_ABSENT_INFORMATION);
2747 }
2748
2749 // The line number table is compressed so we don't know how big it is until decompressed.
2750 // Decompression is really fast so we just do it twice.
2751
2752 // Compute size of table
2753 jint num_entries = 0;
2754 CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table());
2755 while (stream.read_pair()) {
2756 num_entries++;
2757 }
2758 jvmtiLineNumberEntry *jvmti_table =
2759 (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
2760
2761 // Fill jvmti table
2762 if (num_entries > 0) {
2763 int index = 0;
2764 CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table());
2765 while (stream.read_pair()) {
2766 jvmti_table[index].start_location = (jlocation) stream.bci();
2767 jvmti_table[index].line_number = (jint) stream.line();
2768 index++;
2769 }
2770 assert(index == num_entries, "sanity check");
2771 }
2772
2773 // Set up results
2774 (*entry_count_ptr) = num_entries;
2775 (*table_ptr) = jvmti_table;
2776
2777 return JVMTI_ERROR_NONE;
2778 } /* end GetLineNumberTable */
2779
2780
2781 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2782 // start_location_ptr - pre-checked for NULL
2783 // end_location_ptr - pre-checked for NULL
2784 jvmtiError
2785 JvmtiEnv::GetMethodLocation(Method* method_oop, jlocation* start_location_ptr, jlocation* end_location_ptr) {
2786
2787 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2788 // get start and end location
2789 (*end_location_ptr) = (jlocation) (method_oop->code_size() - 1);
2790 if (method_oop->code_size() == 0) {
2791 // there is no code so there is no start location
2792 (*start_location_ptr) = (jlocation)(-1);
2793 } else {
2794 (*start_location_ptr) = (jlocation)(0);
2795 }
2796
2797 return JVMTI_ERROR_NONE;
2798 } /* end GetMethodLocation */
2799
2800
2801 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2802 // entry_count_ptr - pre-checked for NULL
2803 // table_ptr - pre-checked for NULL
2804 jvmtiError
2805 JvmtiEnv::GetLocalVariableTable(Method* method_oop, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
2806
2807 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2808 JavaThread* current_thread = JavaThread::current();
2809
2810 // does the klass have any local variable information?
2811 InstanceKlass* ik = method_oop->method_holder();
2812 if (!ik->access_flags().has_localvariable_table()) {
2813 return (JVMTI_ERROR_ABSENT_INFORMATION);
2814 }
2815
2816 ConstantPool* constants = method_oop->constants();
2817 NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
2818
2819 // in the vm localvariable table representation, 6 consecutive elements in the table
2820 // represent a 6-tuple of shorts
2821 // [start_pc, length, name_index, descriptor_index, signature_index, index]
2822 jint num_entries = method_oop->localvariable_table_length();
2823 jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
2824 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
2825
2826 if (num_entries > 0) {
2827 LocalVariableTableElement* table = method_oop->localvariable_table_start();
2828 for (int i = 0; i < num_entries; i++) {
2829 // get the 5 tuple information from the vm table
2830 jlocation start_location = (jlocation) table[i].start_bci;
2831 jint length = (jint) table[i].length;
2832 int name_index = (int) table[i].name_cp_index;
2833 int signature_index = (int) table[i].descriptor_cp_index;
2834 int generic_signature_index = (int) table[i].signature_cp_index;
2835 jint slot = (jint) table[i].slot;
2836
2837 // get utf8 name and signature
2838 char *name_buf = NULL;
2839 char *sig_buf = NULL;
2840 char *gen_sig_buf = NULL;
2841 {
2842 ResourceMark rm(current_thread);
2843
2844 const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
2845 name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
2846 strcpy(name_buf, utf8_name);
2847
2848 const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
2849 sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
2850 strcpy(sig_buf, utf8_signature);
2851
2852 if (generic_signature_index > 0) {
2853 const char *utf8_gen_sign = (const char *)
2854 constants->symbol_at(generic_signature_index)->as_utf8();
2855 gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
2856 strcpy(gen_sig_buf, utf8_gen_sign);
2857 }
2858 }
2859
2860 // fill in the jvmti local variable table
2861 jvmti_table[i].start_location = start_location;
2862 jvmti_table[i].length = length;
2863 jvmti_table[i].name = name_buf;
2864 jvmti_table[i].signature = sig_buf;
2865 jvmti_table[i].generic_signature = gen_sig_buf;
2866 jvmti_table[i].slot = slot;
2867 }
2868 }
2869
2870 // set results
2871 (*entry_count_ptr) = num_entries;
2872 (*table_ptr) = jvmti_table;
2873
2874 return JVMTI_ERROR_NONE;
2875 } /* end GetLocalVariableTable */
2876
2877
2878 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2879 // bytecode_count_ptr - pre-checked for NULL
2880 // bytecodes_ptr - pre-checked for NULL
2881 jvmtiError
2882 JvmtiEnv::GetBytecodes(Method* method_oop, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
2883 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2884
2885 HandleMark hm;
2886 methodHandle method(method_oop);
2887 jint size = (jint)method->code_size();
2888 jvmtiError err = allocate(size, bytecodes_ptr);
2889 if (err != JVMTI_ERROR_NONE) {
2890 return err;
2891 }
2892
2893 (*bytecode_count_ptr) = size;
2894 // get byte codes
2895 JvmtiClassFileReconstituter::copy_bytecodes(method, *bytecodes_ptr);
2896
2897 return JVMTI_ERROR_NONE;
2898 } /* end GetBytecodes */
2899
2900
2901 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2902 // is_native_ptr - pre-checked for NULL
2903 jvmtiError
2904 JvmtiEnv::IsMethodNative(Method* method_oop, jboolean* is_native_ptr) {
2905 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2906 (*is_native_ptr) = method_oop->is_native();
2907 return JVMTI_ERROR_NONE;
2908 } /* end IsMethodNative */
2909
2910
2911 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2912 // is_synthetic_ptr - pre-checked for NULL
2913 jvmtiError
2914 JvmtiEnv::IsMethodSynthetic(Method* method_oop, jboolean* is_synthetic_ptr) {
2915 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2916 (*is_synthetic_ptr) = method_oop->is_synthetic();
2917 return JVMTI_ERROR_NONE;
2918 } /* end IsMethodSynthetic */
2919
2920
2921 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2922 // is_obsolete_ptr - pre-checked for NULL
2923 jvmtiError
2924 JvmtiEnv::IsMethodObsolete(Method* method_oop, jboolean* is_obsolete_ptr) {
2925 if (use_version_1_0_semantics() &&
2926 get_capabilities()->can_redefine_classes == 0) {
2927 // This JvmtiEnv requested version 1.0 semantics and this function
2928 // requires the can_redefine_classes capability in version 1.0 so
2929 // we need to return an error here.
2930 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
2931 }
2932
2933 if (method_oop == NULL || method_oop->is_obsolete()) {
2934 *is_obsolete_ptr = true;
2935 } else {
2936 *is_obsolete_ptr = false;
2937 }
2938 return JVMTI_ERROR_NONE;
2939 } /* end IsMethodObsolete */
2940
2941 //
2942 // Raw Monitor functions
2943 //
2944
2945 // name - pre-checked for NULL
2946 // monitor_ptr - pre-checked for NULL
2947 jvmtiError
2948 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
2949 JvmtiRawMonitor* rmonitor = new JvmtiRawMonitor(name);
2950 NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
2951
2952 *monitor_ptr = (jrawMonitorID)rmonitor;
2953
2954 return JVMTI_ERROR_NONE;
2955 } /* end CreateRawMonitor */
2956
2957
2958 // rmonitor - pre-checked for validity
2959 jvmtiError
2960 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
2961 if (Threads::number_of_threads() == 0) {
2962 // Remove this monitor from pending raw monitors list
2963 // if it has entered in onload or start phase.
2964 JvmtiPendingMonitors::destroy(rmonitor);
2965 } else {
2966 Thread* thread = Thread::current();
2967 if (rmonitor->is_entered(thread)) {
2968 // The caller owns this monitor which we are about to destroy.
2969 // We exit the underlying synchronization object so that the
2970 // "delete monitor" call below can work without an assertion
2971 // failure on systems that don't like destroying synchronization
2972 // objects that are locked.
2973 int r;
2974 intptr_t recursion = rmonitor->recursions();
2975 for (intptr_t i=0; i <= recursion; i++) {
2976 r = rmonitor->raw_exit(thread);
2977 assert(r == ObjectMonitor::OM_OK, "raw_exit should have worked");
2978 if (r != ObjectMonitor::OM_OK) { // robustness
2979 return JVMTI_ERROR_INTERNAL;
2980 }
2981 }
2982 }
2983 if (rmonitor->owner() != NULL) {
2984 // The caller is trying to destroy a monitor that is locked by
2985 // someone else. While this is not forbidden by the JVMTI
2986 // spec, it will cause an assertion failure on systems that don't
2987 // like destroying synchronization objects that are locked.
2988 // We indicate a problem with the error return (and leak the
2989 // monitor's memory).
2990 return JVMTI_ERROR_NOT_MONITOR_OWNER;
2991 }
2992 }
2993
2994 delete rmonitor;
2995
2996 return JVMTI_ERROR_NONE;
2997 } /* end DestroyRawMonitor */
2998
2999
3000 // rmonitor - pre-checked for validity
3001 jvmtiError
3002 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
3003 if (Threads::number_of_threads() == 0) {
3004 // No JavaThreads exist so ObjectMonitor enter cannot be
3005 // used, add this raw monitor to the pending list.
3006 // The pending monitors will be actually entered when
3007 // the VM is setup.
3008 // See transition_pending_raw_monitors in create_vm()
3009 // in thread.cpp.
3010 JvmtiPendingMonitors::enter(rmonitor);
3011 } else {
3012 int r;
3013 Thread* thread = Thread::current();
3014
3015 if (thread->is_Java_thread()) {
3016 JavaThread* current_thread = (JavaThread*)thread;
3017
3018 #ifdef PROPER_TRANSITIONS
3019 // Not really unknown but ThreadInVMfromNative does more than we want
3020 ThreadInVMfromUnknown __tiv;
3021 {
3022 ThreadBlockInVM __tbivm(current_thread);
3023 r = rmonitor->raw_enter(current_thread);
3024 }
3025 #else
3026 /* Transition to thread_blocked without entering vm state */
3027 /* This is really evil. Normally you can't undo _thread_blocked */
3028 /* transitions like this because it would cause us to miss a */
3029 /* safepoint but since the thread was already in _thread_in_native */
3030 /* the thread is not leaving a safepoint safe state and it will */
3031 /* block when it tries to return from native. We can't safepoint */
3032 /* block in here because we could deadlock the vmthread. Blech. */
3033
3034 JavaThreadState state = current_thread->thread_state();
3035 assert(state == _thread_in_native, "Must be _thread_in_native");
3036 // frame should already be walkable since we are in native
3037 assert(!current_thread->has_last_Java_frame() ||
3038 current_thread->frame_anchor()->walkable(), "Must be walkable");
3039 current_thread->set_thread_state(_thread_blocked);
3040
3041 r = rmonitor->raw_enter(current_thread);
3042 // restore state, still at a safepoint safe state
3043 current_thread->set_thread_state(state);
3044
3045 #endif /* PROPER_TRANSITIONS */
3046 assert(r == ObjectMonitor::OM_OK, "raw_enter should have worked");
3047 } else {
3048 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3049 r = rmonitor->raw_enter(thread);
3050 } else {
3051 ShouldNotReachHere();
3052 }
3053 }
3054
3055 if (r != ObjectMonitor::OM_OK) { // robustness
3056 return JVMTI_ERROR_INTERNAL;
3057 }
3058 }
3059 return JVMTI_ERROR_NONE;
3060 } /* end RawMonitorEnter */
3061
3062
3063 // rmonitor - pre-checked for validity
3064 jvmtiError
3065 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
3066 jvmtiError err = JVMTI_ERROR_NONE;
3067
3068 if (Threads::number_of_threads() == 0) {
3069 // No JavaThreads exist so just remove this monitor from the pending list.
3070 // Bool value from exit is false if rmonitor is not in the list.
3071 if (!JvmtiPendingMonitors::exit(rmonitor)) {
3072 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3073 }
3074 } else {
3075 int r;
3076 Thread* thread = Thread::current();
3077
3078 if (thread->is_Java_thread()) {
3079 JavaThread* current_thread = (JavaThread*)thread;
3080 #ifdef PROPER_TRANSITIONS
3081 // Not really unknown but ThreadInVMfromNative does more than we want
3082 ThreadInVMfromUnknown __tiv;
3083 #endif /* PROPER_TRANSITIONS */
3084 r = rmonitor->raw_exit(current_thread);
3085 } else {
3086 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3087 r = rmonitor->raw_exit(thread);
3088 } else {
3089 ShouldNotReachHere();
3090 }
3091 }
3092
3093 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) {
3094 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3095 } else {
3096 assert(r == ObjectMonitor::OM_OK, "raw_exit should have worked");
3097 if (r != ObjectMonitor::OM_OK) { // robustness
3098 err = JVMTI_ERROR_INTERNAL;
3099 }
3100 }
3101 }
3102 return err;
3103 } /* end RawMonitorExit */
3104
3105
3106 // rmonitor - pre-checked for validity
3107 jvmtiError
3108 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
3109 int r;
3110 Thread* thread = Thread::current();
3111
3112 if (thread->is_Java_thread()) {
3113 JavaThread* current_thread = (JavaThread*)thread;
3114 #ifdef PROPER_TRANSITIONS
3115 // Not really unknown but ThreadInVMfromNative does more than we want
3116 ThreadInVMfromUnknown __tiv;
3117 {
3118 ThreadBlockInVM __tbivm(current_thread);
3119 r = rmonitor->raw_wait(millis, true, current_thread);
3120 }
3121 #else
3122 /* Transition to thread_blocked without entering vm state */
3123 /* This is really evil. Normally you can't undo _thread_blocked */
3124 /* transitions like this because it would cause us to miss a */
3125 /* safepoint but since the thread was already in _thread_in_native */
3126 /* the thread is not leaving a safepoint safe state and it will */
3127 /* block when it tries to return from native. We can't safepoint */
3128 /* block in here because we could deadlock the vmthread. Blech. */
3129
3130 JavaThreadState state = current_thread->thread_state();
3131 assert(state == _thread_in_native, "Must be _thread_in_native");
3132 // frame should already be walkable since we are in native
3133 assert(!current_thread->has_last_Java_frame() ||
3134 current_thread->frame_anchor()->walkable(), "Must be walkable");
3135 current_thread->set_thread_state(_thread_blocked);
3136
3137 r = rmonitor->raw_wait(millis, true, current_thread);
3138 // restore state, still at a safepoint safe state
3139 current_thread->set_thread_state(state);
3140
3141 #endif /* PROPER_TRANSITIONS */
3142 } else {
3143 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3144 r = rmonitor->raw_wait(millis, true, thread);
3145 } else {
3146 ShouldNotReachHere();
3147 }
3148 }
3149
3150 switch (r) {
3151 case ObjectMonitor::OM_INTERRUPTED:
3152 return JVMTI_ERROR_INTERRUPT;
3153 case ObjectMonitor::OM_ILLEGAL_MONITOR_STATE:
3154 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3155 }
3156 assert(r == ObjectMonitor::OM_OK, "raw_wait should have worked");
3157 if (r != ObjectMonitor::OM_OK) { // robustness
3158 return JVMTI_ERROR_INTERNAL;
3159 }
3160
3161 return JVMTI_ERROR_NONE;
3162 } /* end RawMonitorWait */
3163
3164
3165 // rmonitor - pre-checked for validity
3166 jvmtiError
3167 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
3168 int r;
3169 Thread* thread = Thread::current();
3170
3171 if (thread->is_Java_thread()) {
3172 JavaThread* current_thread = (JavaThread*)thread;
3173 // Not really unknown but ThreadInVMfromNative does more than we want
3174 ThreadInVMfromUnknown __tiv;
3175 r = rmonitor->raw_notify(current_thread);
3176 } else {
3177 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3178 r = rmonitor->raw_notify(thread);
3179 } else {
3180 ShouldNotReachHere();
3181 }
3182 }
3183
3184 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) {
3185 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3186 }
3187 assert(r == ObjectMonitor::OM_OK, "raw_notify should have worked");
3188 if (r != ObjectMonitor::OM_OK) { // robustness
3189 return JVMTI_ERROR_INTERNAL;
3190 }
3191
3192 return JVMTI_ERROR_NONE;
3193 } /* end RawMonitorNotify */
3194
3195
3196 // rmonitor - pre-checked for validity
3197 jvmtiError
3198 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
3199 int r;
3200 Thread* thread = Thread::current();
3201
3202 if (thread->is_Java_thread()) {
3203 JavaThread* current_thread = (JavaThread*)thread;
3204 ThreadInVMfromUnknown __tiv;
3205 r = rmonitor->raw_notifyAll(current_thread);
3206 } else {
3207 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3208 r = rmonitor->raw_notifyAll(thread);
3209 } else {
3210 ShouldNotReachHere();
3211 }
3212 }
3213
3214 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) {
3215 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3216 }
3217 assert(r == ObjectMonitor::OM_OK, "raw_notifyAll should have worked");
3218 if (r != ObjectMonitor::OM_OK) { // robustness
3219 return JVMTI_ERROR_INTERNAL;
3220 }
3221
3222 return JVMTI_ERROR_NONE;
3223 } /* end RawMonitorNotifyAll */
3224
3225
3226 //
3227 // JNI Function Interception functions
3228 //
3229
3230
3231 // function_table - pre-checked for NULL
3232 jvmtiError
3233 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
3234 // Copy jni function table at safepoint.
3235 VM_JNIFunctionTableCopier copier(function_table);
3236 VMThread::execute(&copier);
3237
3238 return JVMTI_ERROR_NONE;
3239 } /* end SetJNIFunctionTable */
3240
3241
3242 // function_table - pre-checked for NULL
3243 jvmtiError
3244 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
3245 *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
3246 if (*function_table == NULL)
3247 return JVMTI_ERROR_OUT_OF_MEMORY;
3248 memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
3249 return JVMTI_ERROR_NONE;
3250 } /* end GetJNIFunctionTable */
3251
3252
3253 //
3254 // Event Management functions
3255 //
3256
3257 jvmtiError
3258 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
3259 // can only generate two event types
3260 if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
3261 event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
3262 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3263 }
3264
3265 // for compiled_method_load events we must check that the environment
3266 // has the can_generate_compiled_method_load_events capability.
3267 if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
3268 if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
3269 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3270 }
3271 return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
3272 } else {
3273 return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
3274 }
3275
3276 } /* end GenerateEvents */
3277
3278
3279 //
3280 // Extension Mechanism functions
3281 //
3282
3283 // extension_count_ptr - pre-checked for NULL
3284 // extensions - pre-checked for NULL
3285 jvmtiError
3286 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
3287 return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
3288 } /* end GetExtensionFunctions */
3289
3290
3291 // extension_count_ptr - pre-checked for NULL
3292 // extensions - pre-checked for NULL
3293 jvmtiError
3294 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
3295 return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
3296 } /* end GetExtensionEvents */
3297
3298
3299 // callback - NULL is a valid value, must be checked
3300 jvmtiError
3301 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
3302 return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
3303 } /* end SetExtensionEventCallback */
3304
3305 //
3306 // Timers functions
3307 //
3308
3309 // info_ptr - pre-checked for NULL
3310 jvmtiError
3311 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3312 os::current_thread_cpu_time_info(info_ptr);
3313 return JVMTI_ERROR_NONE;
3314 } /* end GetCurrentThreadCpuTimerInfo */
3315
3316
3317 // nanos_ptr - pre-checked for NULL
3318 jvmtiError
3319 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
3320 *nanos_ptr = os::current_thread_cpu_time();
3321 return JVMTI_ERROR_NONE;
3322 } /* end GetCurrentThreadCpuTime */
3323
3324
3325 // info_ptr - pre-checked for NULL
3326 jvmtiError
3327 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3328 os::thread_cpu_time_info(info_ptr);
3329 return JVMTI_ERROR_NONE;
3330 } /* end GetThreadCpuTimerInfo */
3331
3332
3333 // Threads_lock NOT held, java_thread not protected by lock
3334 // java_thread - pre-checked
3335 // nanos_ptr - pre-checked for NULL
3336 jvmtiError
3337 JvmtiEnv::GetThreadCpuTime(JavaThread* java_thread, jlong* nanos_ptr) {
3338 *nanos_ptr = os::thread_cpu_time(java_thread);
3339 return JVMTI_ERROR_NONE;
3340 } /* end GetThreadCpuTime */
3341
3342
3343 // info_ptr - pre-checked for NULL
3344 jvmtiError
3345 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
3346 os::javaTimeNanos_info(info_ptr);
3347 return JVMTI_ERROR_NONE;
3348 } /* end GetTimerInfo */
3349
3350
3351 // nanos_ptr - pre-checked for NULL
3352 jvmtiError
3353 JvmtiEnv::GetTime(jlong* nanos_ptr) {
3354 *nanos_ptr = os::javaTimeNanos();
3355 return JVMTI_ERROR_NONE;
3356 } /* end GetTime */
3357
3358
3359 // processor_count_ptr - pre-checked for NULL
3360 jvmtiError
3361 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
3362 *processor_count_ptr = os::active_processor_count();
3363 return JVMTI_ERROR_NONE;
3364 } /* end GetAvailableProcessors */
3365
3366 //
3367 // System Properties functions
3368 //
3369
3370 // count_ptr - pre-checked for NULL
3371 // property_ptr - pre-checked for NULL
3372 jvmtiError
3373 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
3374 jvmtiError err = JVMTI_ERROR_NONE;
3375
3376 *count_ptr = Arguments::PropertyList_count(Arguments::system_properties());
3377
3378 err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
3379 if (err != JVMTI_ERROR_NONE) {
3380 return err;
3381 }
3382 int i = 0 ;
3383 for (SystemProperty* p = Arguments::system_properties(); p != NULL && i < *count_ptr; p = p->next(), i++) {
3384 const char *key = p->key();
3385 char **tmp_value = *property_ptr+i;
3386 err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
3387 if (err == JVMTI_ERROR_NONE) {
3388 strcpy(*tmp_value, key);
3389 } else {
3390 // clean up previously allocated memory.
3391 for (int j=0; j<i; j++) {
3392 Deallocate((unsigned char*)*property_ptr+j);
3393 }
3394 Deallocate((unsigned char*)property_ptr);
3395 break;
3396 }
3397 }
3398 return err;
3399 } /* end GetSystemProperties */
3400
3401
3402 // property - pre-checked for NULL
3403 // value_ptr - pre-checked for NULL
3404 jvmtiError
3405 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
3406 jvmtiError err = JVMTI_ERROR_NONE;
3407 const char *value;
3408
3409 value = Arguments::PropertyList_get_value(Arguments::system_properties(), property);
3410 if (value == NULL) {
3411 err = JVMTI_ERROR_NOT_AVAILABLE;
3412 } else {
3413 err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
3414 if (err == JVMTI_ERROR_NONE) {
3415 strcpy(*value_ptr, value);
3416 }
3417 }
3418 return err;
3419 } /* end GetSystemProperty */
3420
3421
3422 // property - pre-checked for NULL
3423 // value - NULL is a valid value, must be checked
3424 jvmtiError
3425 JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) {
3426 jvmtiError err =JVMTI_ERROR_NOT_AVAILABLE;
3427
3428 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
3429 if (strcmp(property, p->key()) == 0) {
3430 if (p->set_value((char *)value_ptr)) {
3431 err = JVMTI_ERROR_NONE;
3432 }
3433 }
3434 }
3435 return err;
3436 } /* end SetSystemProperty */