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 MonitorLockerEx ml(constants->lock()); // lock constant pool while we query it
263
264 JvmtiClassFileReconstituter reconstituter(ikh);
265 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
266 return reconstituter.get_error();
267 }
268
269 class_definitions[index].class_byte_count = (jint)reconstituter.class_file_size();
270 class_definitions[index].class_bytes = (unsigned char*)
271 reconstituter.class_file_bytes();
272 } else {
273 // it is cached, get it from the cache
274 class_definitions[index].class_byte_count = ikh->get_cached_class_file_len();
275 class_definitions[index].class_bytes = ikh->get_cached_class_file_bytes();
276 }
277 class_definitions[index].klass = jcls;
278 }
279 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
280 VMThread::execute(&op);
281 return (op.check_error());
282 } /* end RetransformClasses */
283
284
285 // class_count - pre-checked to be greater than or equal to 0
286 // class_definitions - pre-checked for NULL
287 jvmtiError
288 JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) {
289 //TODO: add locking
290 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
291 VMThread::execute(&op);
292 return (op.check_error());
293 } /* end RedefineClasses */
294
295
296 //
297 // Object functions
298 //
299
300 // size_ptr - pre-checked for NULL
301 jvmtiError
302 JvmtiEnv::GetObjectSize(jobject object, jlong* size_ptr) {
303 oop mirror = JNIHandles::resolve_external_guard(object);
304 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
305
306 if (mirror->klass() == SystemDictionary::Class_klass() &&
307 !java_lang_Class::is_primitive(mirror)) {
308 Klass* k = java_lang_Class::as_Klass(mirror);
309 assert(k != NULL, "class for non-primitive mirror must exist");
310 *size_ptr = (jlong)k->size() * wordSize;
311 } else {
312 *size_ptr = (jlong)mirror->size() * wordSize;
313 }
314 return JVMTI_ERROR_NONE;
315 } /* end GetObjectSize */
316
317 //
318 // Method functions
319 //
320
321 // prefix - NULL is a valid value, must be checked
322 jvmtiError
323 JvmtiEnv::SetNativeMethodPrefix(const char* prefix) {
324 return prefix == NULL?
325 SetNativeMethodPrefixes(0, NULL) :
326 SetNativeMethodPrefixes(1, (char**)&prefix);
327 } /* end SetNativeMethodPrefix */
328
329
330 // prefix_count - pre-checked to be greater than or equal to 0
331 // prefixes - pre-checked for NULL
332 jvmtiError
333 JvmtiEnv::SetNativeMethodPrefixes(jint prefix_count, char** prefixes) {
334 // Have to grab JVMTI thread state lock to be sure that some thread
335 // isn't accessing the prefixes at the same time we are setting them.
336 // No locks during VM bring-up.
337 if (Threads::number_of_threads() == 0) {
338 return set_native_method_prefixes(prefix_count, prefixes);
339 } else {
340 MutexLocker mu(JvmtiThreadState_lock);
341 return set_native_method_prefixes(prefix_count, prefixes);
342 }
343 } /* end SetNativeMethodPrefixes */
344
345 //
346 // Event Management functions
347 //
348
349 // callbacks - NULL is a valid value, must be checked
350 // size_of_callbacks - pre-checked to be greater than or equal to 0
351 jvmtiError
352 JvmtiEnv::SetEventCallbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) {
353 JvmtiEventController::set_event_callbacks(this, callbacks, size_of_callbacks);
354 return JVMTI_ERROR_NONE;
355 } /* end SetEventCallbacks */
356
357
358 // event_thread - NULL is a valid value, must be checked
359 jvmtiError
360 JvmtiEnv::SetEventNotificationMode(jvmtiEventMode mode, jvmtiEvent event_type, jthread event_thread, ...) {
361 JavaThread* java_thread = NULL;
362 if (event_thread != NULL) {
363 oop thread_oop = JNIHandles::resolve_external_guard(event_thread);
364 if (thread_oop == NULL) {
365 return JVMTI_ERROR_INVALID_THREAD;
366 }
367 if (!thread_oop->is_a(SystemDictionary::Thread_klass())) {
368 return JVMTI_ERROR_INVALID_THREAD;
369 }
370 java_thread = java_lang_Thread::thread(thread_oop);
371 if (java_thread == NULL) {
372 return JVMTI_ERROR_THREAD_NOT_ALIVE;
373 }
374 }
375
376 // event_type must be valid
377 if (!JvmtiEventController::is_valid_event_type(event_type)) {
378 return JVMTI_ERROR_INVALID_EVENT_TYPE;
379 }
380
381 // global events cannot be controlled at thread level.
382 if (java_thread != NULL && JvmtiEventController::is_global_event(event_type)) {
383 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
384 }
385
386 bool enabled = (mode == JVMTI_ENABLE);
387
388 // assure that needed capabilities are present
389 if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) {
390 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
391 }
392
393 if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) {
394 record_class_file_load_hook_enabled();
395 }
396 JvmtiEventController::set_user_enabled(this, java_thread, event_type, enabled);
397
398 return JVMTI_ERROR_NONE;
399 } /* end SetEventNotificationMode */
400
401 //
402 // Capability functions
403 //
404
405 // capabilities_ptr - pre-checked for NULL
406 jvmtiError
407 JvmtiEnv::GetPotentialCapabilities(jvmtiCapabilities* capabilities_ptr) {
408 JvmtiManageCapabilities::get_potential_capabilities(get_capabilities(),
409 get_prohibited_capabilities(),
410 capabilities_ptr);
411 return JVMTI_ERROR_NONE;
412 } /* end GetPotentialCapabilities */
413
414
415 // capabilities_ptr - pre-checked for NULL
416 jvmtiError
417 JvmtiEnv::AddCapabilities(const jvmtiCapabilities* capabilities_ptr) {
418 return JvmtiManageCapabilities::add_capabilities(get_capabilities(),
419 get_prohibited_capabilities(),
420 capabilities_ptr,
421 get_capabilities());
422 } /* end AddCapabilities */
423
424
425 // capabilities_ptr - pre-checked for NULL
426 jvmtiError
427 JvmtiEnv::RelinquishCapabilities(const jvmtiCapabilities* capabilities_ptr) {
428 JvmtiManageCapabilities::relinquish_capabilities(get_capabilities(), capabilities_ptr, get_capabilities());
429 return JVMTI_ERROR_NONE;
430 } /* end RelinquishCapabilities */
431
432
433 // capabilities_ptr - pre-checked for NULL
434 jvmtiError
435 JvmtiEnv::GetCapabilities(jvmtiCapabilities* capabilities_ptr) {
436 JvmtiManageCapabilities::copy_capabilities(get_capabilities(), capabilities_ptr);
437 return JVMTI_ERROR_NONE;
438 } /* end GetCapabilities */
439
440 //
441 // Class Loader Search functions
442 //
443
444 // segment - pre-checked for NULL
445 jvmtiError
446 JvmtiEnv::AddToBootstrapClassLoaderSearch(const char* segment) {
447 jvmtiPhase phase = get_phase();
448 if (phase == JVMTI_PHASE_ONLOAD) {
449 Arguments::append_sysclasspath(segment);
450 return JVMTI_ERROR_NONE;
451 } else if (use_version_1_0_semantics()) {
452 // This JvmtiEnv requested version 1.0 semantics and this function
453 // is only allowed in the ONLOAD phase in version 1.0 so we need to
454 // return an error here.
455 return JVMTI_ERROR_WRONG_PHASE;
456 } else if (phase == JVMTI_PHASE_LIVE) {
457 // The phase is checked by the wrapper that called this function,
458 // but this thread could be racing with the thread that is
459 // terminating the VM so we check one more time.
460
461 // create the zip entry
462 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment);
463 if (zip_entry == NULL) {
464 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
465 }
466
467 // lock the loader
468 Thread* thread = Thread::current();
469 HandleMark hm;
470 Handle loader_lock = Handle(thread, SystemDictionary::system_loader_lock());
471
472 ObjectLocker ol(loader_lock, thread);
473
474 // add the jar file to the bootclasspath
475 if (TraceClassLoading) {
476 tty->print_cr("[Opened %s]", zip_entry->name());
477 }
478 ClassLoader::add_to_list(zip_entry);
479 return JVMTI_ERROR_NONE;
480 } else {
481 return JVMTI_ERROR_WRONG_PHASE;
482 }
483
484 } /* end AddToBootstrapClassLoaderSearch */
485
486
487 // segment - pre-checked for NULL
488 jvmtiError
489 JvmtiEnv::AddToSystemClassLoaderSearch(const char* segment) {
490 jvmtiPhase phase = get_phase();
491
492 if (phase == JVMTI_PHASE_ONLOAD) {
493 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
494 if (strcmp("java.class.path", p->key()) == 0) {
495 p->append_value(segment);
496 break;
497 }
498 }
499 return JVMTI_ERROR_NONE;
500 } else if (phase == JVMTI_PHASE_LIVE) {
501 // The phase is checked by the wrapper that called this function,
502 // but this thread could be racing with the thread that is
503 // terminating the VM so we check one more time.
504 HandleMark hm;
505
506 // create the zip entry (which will open the zip file and hence
507 // check that the segment is indeed a zip file).
508 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment);
509 if (zip_entry == NULL) {
510 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
511 }
512 delete zip_entry; // no longer needed
513
514 // lock the loader
515 Thread* THREAD = Thread::current();
516 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
517
518 ObjectLocker ol(loader, THREAD);
519
520 // need the path as java.lang.String
521 Handle path = java_lang_String::create_from_platform_dependent_str(segment, THREAD);
522 if (HAS_PENDING_EXCEPTION) {
523 CLEAR_PENDING_EXCEPTION;
524 return JVMTI_ERROR_INTERNAL;
525 }
526
527 instanceKlassHandle loader_ik(THREAD, loader->klass());
528
529 // Invoke the appendToClassPathForInstrumentation method - if the method
530 // is not found it means the loader doesn't support adding to the class path
531 // in the live phase.
532 {
533 JavaValue res(T_VOID);
534 JavaCalls::call_special(&res,
535 loader,
536 loader_ik,
537 vmSymbols::appendToClassPathForInstrumentation_name(),
538 vmSymbols::appendToClassPathForInstrumentation_signature(),
539 path,
540 THREAD);
541 if (HAS_PENDING_EXCEPTION) {
542 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
543 CLEAR_PENDING_EXCEPTION;
544
545 if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) {
546 return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED;
547 } else {
548 return JVMTI_ERROR_INTERNAL;
549 }
550 }
551 }
552
553 return JVMTI_ERROR_NONE;
554 } else {
555 return JVMTI_ERROR_WRONG_PHASE;
556 }
557 } /* end AddToSystemClassLoaderSearch */
558
559 //
560 // General functions
561 //
562
563 // phase_ptr - pre-checked for NULL
564 jvmtiError
565 JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) {
566 *phase_ptr = get_phase();
567 return JVMTI_ERROR_NONE;
568 } /* end GetPhase */
569
570
571 jvmtiError
572 JvmtiEnv::DisposeEnvironment() {
573 dispose();
574 return JVMTI_ERROR_NONE;
575 } /* end DisposeEnvironment */
576
577
578 // data - NULL is a valid value, must be checked
579 jvmtiError
580 JvmtiEnv::SetEnvironmentLocalStorage(const void* data) {
581 set_env_local_storage(data);
582 return JVMTI_ERROR_NONE;
583 } /* end SetEnvironmentLocalStorage */
584
585
586 // data_ptr - pre-checked for NULL
587 jvmtiError
588 JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) {
589 *data_ptr = (void*)get_env_local_storage();
590 return JVMTI_ERROR_NONE;
591 } /* end GetEnvironmentLocalStorage */
592
593 // version_ptr - pre-checked for NULL
594 jvmtiError
595 JvmtiEnv::GetVersionNumber(jint* version_ptr) {
596 *version_ptr = JVMTI_VERSION;
597 return JVMTI_ERROR_NONE;
598 } /* end GetVersionNumber */
599
600
601 // name_ptr - pre-checked for NULL
602 jvmtiError
603 JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) {
604 if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) {
605 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
606 }
607 const char *name = JvmtiUtil::error_name(error);
608 if (name == NULL) {
609 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
610 }
611 size_t len = strlen(name) + 1;
612 jvmtiError err = allocate(len, (unsigned char**)name_ptr);
613 if (err == JVMTI_ERROR_NONE) {
614 memcpy(*name_ptr, name, len);
615 }
616 return err;
617 } /* end GetErrorName */
618
619
620 jvmtiError
621 JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) {
622 switch (flag) {
623 case JVMTI_VERBOSE_OTHER:
624 // ignore
625 break;
626 case JVMTI_VERBOSE_CLASS:
627 TraceClassLoading = value != 0;
628 TraceClassUnloading = value != 0;
629 break;
630 case JVMTI_VERBOSE_GC:
631 PrintGC = value != 0;
632 break;
633 case JVMTI_VERBOSE_JNI:
634 PrintJNIResolving = value != 0;
635 break;
636 default:
637 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
638 };
639 return JVMTI_ERROR_NONE;
640 } /* end SetVerboseFlag */
641
642
643 // format_ptr - pre-checked for NULL
644 jvmtiError
645 JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) {
646 *format_ptr = JVMTI_JLOCATION_JVMBCI;
647 return JVMTI_ERROR_NONE;
648 } /* end GetJLocationFormat */
649
650 //
651 // Thread functions
652 //
653
654 // Threads_lock NOT held
655 // thread - NOT pre-checked
656 // thread_state_ptr - pre-checked for NULL
657 jvmtiError
658 JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) {
659 jint state;
660 oop thread_oop;
661 JavaThread* thr;
662
663 if (thread == NULL) {
664 thread_oop = JavaThread::current()->threadObj();
665 } else {
666 thread_oop = JNIHandles::resolve_external_guard(thread);
667 }
668
669 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) {
670 return JVMTI_ERROR_INVALID_THREAD;
671 }
672
673 // get most state bits
674 state = (jint)java_lang_Thread::get_thread_status(thread_oop);
675
676 // add more state bits
677 thr = java_lang_Thread::thread(thread_oop);
678 if (thr != NULL) {
679 JavaThreadState jts = thr->thread_state();
680
681 if (thr->is_being_ext_suspended()) {
682 state |= JVMTI_THREAD_STATE_SUSPENDED;
683 }
684 if (jts == _thread_in_native) {
685 state |= JVMTI_THREAD_STATE_IN_NATIVE;
686 }
687 OSThread* osThread = thr->osthread();
688 if (osThread != NULL && osThread->interrupted()) {
689 state |= JVMTI_THREAD_STATE_INTERRUPTED;
690 }
691 }
692
693 *thread_state_ptr = state;
694 return JVMTI_ERROR_NONE;
695 } /* end GetThreadState */
696
697
698 // thread_ptr - pre-checked for NULL
699 jvmtiError
700 JvmtiEnv::GetCurrentThread(jthread* thread_ptr) {
701 JavaThread* current_thread = JavaThread::current();
702 *thread_ptr = (jthread)JNIHandles::make_local(current_thread, current_thread->threadObj());
703 return JVMTI_ERROR_NONE;
704 } /* end GetCurrentThread */
705
706
707 // threads_count_ptr - pre-checked for NULL
708 // threads_ptr - pre-checked for NULL
709 jvmtiError
710 JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) {
711 int nthreads = 0;
712 Handle *thread_objs = NULL;
713 ResourceMark rm;
714 HandleMark hm;
715
716 // enumerate threads (including agent threads)
717 ThreadsListEnumerator tle(Thread::current(), true);
718 nthreads = tle.num_threads();
719 *threads_count_ptr = nthreads;
720
721 if (nthreads == 0) {
722 *threads_ptr = NULL;
723 return JVMTI_ERROR_NONE;
724 }
725
726 thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads);
727 NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY);
728
729 for (int i=0; i < nthreads; i++) {
730 thread_objs[i] = Handle(tle.get_threadObj(i));
731 }
732
733 // have to make global handles outside of Threads_lock
734 jthread *jthreads = new_jthreadArray(nthreads, thread_objs);
735 NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY);
736
737 *threads_ptr = jthreads;
738 return JVMTI_ERROR_NONE;
739 } /* end GetAllThreads */
740
741
742 // Threads_lock NOT held, java_thread not protected by lock
743 // java_thread - pre-checked
744 jvmtiError
745 JvmtiEnv::SuspendThread(JavaThread* java_thread) {
746 // don't allow hidden thread suspend request.
747 if (java_thread->is_hidden_from_external_view()) {
748 return (JVMTI_ERROR_NONE);
749 }
750
751 {
752 MutexLockerEx ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag);
753 if (java_thread->is_external_suspend()) {
754 // don't allow nested external suspend requests.
755 return (JVMTI_ERROR_THREAD_SUSPENDED);
756 }
757 if (java_thread->is_exiting()) { // thread is in the process of exiting
758 return (JVMTI_ERROR_THREAD_NOT_ALIVE);
759 }
760 java_thread->set_external_suspend();
761 }
762
763 if (!JvmtiSuspendControl::suspend(java_thread)) {
764 // the thread was in the process of exiting
765 return (JVMTI_ERROR_THREAD_NOT_ALIVE);
766 }
767 return JVMTI_ERROR_NONE;
768 } /* end SuspendThread */
769
770
771 // request_count - pre-checked to be greater than or equal to 0
772 // request_list - pre-checked for NULL
773 // results - pre-checked for NULL
774 jvmtiError
775 JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
776 int needSafepoint = 0; // > 0 if we need a safepoint
777 for (int i = 0; i < request_count; i++) {
778 JavaThread *java_thread = get_JavaThread(request_list[i]);
779 if (java_thread == NULL) {
780 results[i] = JVMTI_ERROR_INVALID_THREAD;
781 continue;
782 }
783 // the thread has not yet run or has exited (not on threads list)
784 if (java_thread->threadObj() == NULL) {
785 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
786 continue;
787 }
788 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) {
789 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
790 continue;
791 }
792 // don't allow hidden thread suspend request.
793 if (java_thread->is_hidden_from_external_view()) {
794 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend
795 continue;
796 }
797
798 {
799 MutexLockerEx ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag);
800 if (java_thread->is_external_suspend()) {
801 // don't allow nested external suspend requests.
802 results[i] = JVMTI_ERROR_THREAD_SUSPENDED;
803 continue;
804 }
805 if (java_thread->is_exiting()) { // thread is in the process of exiting
806 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
807 continue;
808 }
809 java_thread->set_external_suspend();
810 }
811 if (java_thread->thread_state() == _thread_in_native) {
812 // We need to try and suspend native threads here. Threads in
813 // other states will self-suspend on their next transition.
814 if (!JvmtiSuspendControl::suspend(java_thread)) {
815 // The thread was in the process of exiting. Force another
816 // safepoint to make sure that this thread transitions.
817 needSafepoint++;
818 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
819 continue;
820 }
821 } else {
822 needSafepoint++;
823 }
824 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend
825 }
826 if (needSafepoint > 0) {
827 VM_ForceSafepoint vfs;
828 VMThread::execute(&vfs);
829 }
830 // per-thread suspend results returned via results parameter
831 return JVMTI_ERROR_NONE;
832 } /* end SuspendThreadList */
833
834
835 // Threads_lock NOT held, java_thread not protected by lock
836 // java_thread - pre-checked
837 jvmtiError
838 JvmtiEnv::ResumeThread(JavaThread* java_thread) {
839 // don't allow hidden thread resume request.
840 if (java_thread->is_hidden_from_external_view()) {
841 return JVMTI_ERROR_NONE;
842 }
843
844 if (!java_thread->is_being_ext_suspended()) {
845 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
846 }
847
848 if (!JvmtiSuspendControl::resume(java_thread)) {
849 return JVMTI_ERROR_INTERNAL;
850 }
851 return JVMTI_ERROR_NONE;
852 } /* end ResumeThread */
853
854
855 // request_count - pre-checked to be greater than or equal to 0
856 // request_list - pre-checked for NULL
857 // results - pre-checked for NULL
858 jvmtiError
859 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
860 for (int i = 0; i < request_count; i++) {
861 JavaThread *java_thread = get_JavaThread(request_list[i]);
862 if (java_thread == NULL) {
863 results[i] = JVMTI_ERROR_INVALID_THREAD;
864 continue;
865 }
866 // don't allow hidden thread resume request.
867 if (java_thread->is_hidden_from_external_view()) {
868 results[i] = JVMTI_ERROR_NONE; // indicate successful resume
869 continue;
870 }
871 if (!java_thread->is_being_ext_suspended()) {
872 results[i] = JVMTI_ERROR_THREAD_NOT_SUSPENDED;
873 continue;
874 }
875
876 if (!JvmtiSuspendControl::resume(java_thread)) {
877 results[i] = JVMTI_ERROR_INTERNAL;
878 continue;
879 }
880
881 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend
882 }
883 // per-thread resume results returned via results parameter
884 return JVMTI_ERROR_NONE;
885 } /* end ResumeThreadList */
886
887
888 // Threads_lock NOT held, java_thread not protected by lock
889 // java_thread - pre-checked
890 jvmtiError
891 JvmtiEnv::StopThread(JavaThread* java_thread, jobject exception) {
892 oop e = JNIHandles::resolve_external_guard(exception);
893 NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
894
895 JavaThread::send_async_exception(java_thread->threadObj(), e);
896
897 return JVMTI_ERROR_NONE;
898
899 } /* end StopThread */
900
901
902 // Threads_lock NOT held
903 // thread - NOT pre-checked
904 jvmtiError
905 JvmtiEnv::InterruptThread(jthread thread) {
906 oop thread_oop = JNIHandles::resolve_external_guard(thread);
907 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass()))
908 return JVMTI_ERROR_INVALID_THREAD;
909
910 JavaThread* current_thread = JavaThread::current();
911
912 // Todo: this is a duplicate of JVM_Interrupt; share code in future
913 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
914 MutexLockerEx ml(current_thread->threadObj() == thread_oop ? NULL : Threads_lock);
915 // We need to re-resolve the java_thread, since a GC might have happened during the
916 // acquire of the lock
917
918 JavaThread* java_thread = java_lang_Thread::thread(JNIHandles::resolve_external_guard(thread));
919 NULL_CHECK(java_thread, JVMTI_ERROR_THREAD_NOT_ALIVE);
920
921 Thread::interrupt(java_thread);
922
923 return JVMTI_ERROR_NONE;
924 } /* end InterruptThread */
925
926
927 // Threads_lock NOT held
928 // thread - NOT pre-checked
929 // info_ptr - pre-checked for NULL
930 jvmtiError
931 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
932 ResourceMark rm;
933 HandleMark hm;
934
935 JavaThread* current_thread = JavaThread::current();
936
937 // if thread is NULL the current thread is used
938 oop thread_oop;
939 if (thread == NULL) {
940 thread_oop = current_thread->threadObj();
941 } else {
942 thread_oop = JNIHandles::resolve_external_guard(thread);
943 }
944 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass()))
945 return JVMTI_ERROR_INVALID_THREAD;
946
947 Handle thread_obj(current_thread, thread_oop);
948 typeArrayHandle name;
949 ThreadPriority priority;
950 Handle thread_group;
951 Handle context_class_loader;
952 bool is_daemon;
953
954 { MutexLocker mu(Threads_lock);
955
956 name = typeArrayHandle(current_thread, java_lang_Thread::name(thread_obj()));
957 priority = java_lang_Thread::priority(thread_obj());
958 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
959 is_daemon = java_lang_Thread::is_daemon(thread_obj());
960
961 oop loader = java_lang_Thread::context_class_loader(thread_obj());
962 context_class_loader = Handle(current_thread, loader);
963 }
964 { const char *n;
965
966 if (name() != NULL) {
967 n = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
968 } else {
969 n = UNICODE::as_utf8(NULL, 0);
970 }
971
972 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
973 if (info_ptr->name == NULL)
974 return JVMTI_ERROR_OUT_OF_MEMORY;
975
976 strcpy(info_ptr->name, n);
977 }
978 info_ptr->is_daemon = is_daemon;
979 info_ptr->priority = priority;
980
981 info_ptr->context_class_loader = (context_class_loader.is_null()) ? NULL :
982 jni_reference(context_class_loader);
983 info_ptr->thread_group = jni_reference(thread_group);
984
985 return JVMTI_ERROR_NONE;
986 } /* end GetThreadInfo */
987
988
989 // Threads_lock NOT held, java_thread not protected by lock
990 // java_thread - pre-checked
991 // owned_monitor_count_ptr - pre-checked for NULL
992 // owned_monitors_ptr - pre-checked for NULL
993 jvmtiError
994 JvmtiEnv::GetOwnedMonitorInfo(JavaThread* java_thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
995 jvmtiError err = JVMTI_ERROR_NONE;
996 JavaThread* calling_thread = JavaThread::current();
997
998 // growable array of jvmti monitors info on the C-heap
999 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1000 new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true);
1001
1002 uint32_t debug_bits = 0;
1003 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
1004 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1005 } else {
1006 // JVMTI get monitors info at safepoint. Do not require target thread to
1007 // be suspended.
1008 VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list);
1009 VMThread::execute(&op);
1010 err = op.result();
1011 }
1012 jint owned_monitor_count = owned_monitors_list->length();
1013 if (err == JVMTI_ERROR_NONE) {
1014 if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1015 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1016 // copy into the returned array
1017 for (int i = 0; i < owned_monitor_count; i++) {
1018 (*owned_monitors_ptr)[i] =
1019 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1020 }
1021 *owned_monitor_count_ptr = owned_monitor_count;
1022 }
1023 }
1024 // clean up.
1025 for (int i = 0; i < owned_monitor_count; i++) {
1026 deallocate((unsigned char*)owned_monitors_list->at(i));
1027 }
1028 delete owned_monitors_list;
1029
1030 return err;
1031 } /* end GetOwnedMonitorInfo */
1032
1033
1034 // Threads_lock NOT held, java_thread not protected by lock
1035 // java_thread - pre-checked
1036 // monitor_info_count_ptr - pre-checked for NULL
1037 // monitor_info_ptr - pre-checked for NULL
1038 jvmtiError
1039 JvmtiEnv::GetOwnedMonitorStackDepthInfo(JavaThread* java_thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1040 jvmtiError err = JVMTI_ERROR_NONE;
1041 JavaThread* calling_thread = JavaThread::current();
1042
1043 // growable array of jvmti monitors info on the C-heap
1044 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1045 new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true);
1046
1047 uint32_t debug_bits = 0;
1048 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
1049 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1050 } else {
1051 // JVMTI get owned monitors info at safepoint. Do not require target thread to
1052 // be suspended.
1053 VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list);
1054 VMThread::execute(&op);
1055 err = op.result();
1056 }
1057
1058 jint owned_monitor_count = owned_monitors_list->length();
1059 if (err == JVMTI_ERROR_NONE) {
1060 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1061 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1062 // copy to output array.
1063 for (int i = 0; i < owned_monitor_count; i++) {
1064 (*monitor_info_ptr)[i].monitor =
1065 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1066 (*monitor_info_ptr)[i].stack_depth =
1067 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1068 }
1069 }
1070 *monitor_info_count_ptr = owned_monitor_count;
1071 }
1072
1073 // clean up.
1074 for (int i = 0; i < owned_monitor_count; i++) {
1075 deallocate((unsigned char*)owned_monitors_list->at(i));
1076 }
1077 delete owned_monitors_list;
1078
1079 return err;
1080 } /* end GetOwnedMonitorStackDepthInfo */
1081
1082
1083 // Threads_lock NOT held, java_thread not protected by lock
1084 // java_thread - pre-checked
1085 // monitor_ptr - pre-checked for NULL
1086 jvmtiError
1087 JvmtiEnv::GetCurrentContendedMonitor(JavaThread* java_thread, jobject* monitor_ptr) {
1088 jvmtiError err = JVMTI_ERROR_NONE;
1089 uint32_t debug_bits = 0;
1090 JavaThread* calling_thread = JavaThread::current();
1091 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
1092 err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr);
1093 } else {
1094 // get contended monitor information at safepoint.
1095 VM_GetCurrentContendedMonitor op(this, calling_thread, java_thread, monitor_ptr);
1096 VMThread::execute(&op);
1097 err = op.result();
1098 }
1099 return err;
1100 } /* end GetCurrentContendedMonitor */
1101
1102
1103 // Threads_lock NOT held
1104 // thread - NOT pre-checked
1105 // proc - pre-checked for NULL
1106 // arg - NULL is a valid value, must be checked
1107 jvmtiError
1108 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1109 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1110 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) {
1111 return JVMTI_ERROR_INVALID_THREAD;
1112 }
1113 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1114 return JVMTI_ERROR_INVALID_PRIORITY;
1115 }
1116
1117 //Thread-self
1118 JavaThread* current_thread = JavaThread::current();
1119
1120 Handle thread_hndl(current_thread, thread_oop);
1121 {
1122 MutexLocker mu(Threads_lock); // grab Threads_lock
1123
1124 JvmtiAgentThread *new_thread = new JvmtiAgentThread(this, proc, arg);
1125
1126 // At this point it may be possible that no osthread was created for the
1127 // JavaThread due to lack of memory.
1128 if (new_thread == NULL || new_thread->osthread() == NULL) {
1129 if (new_thread) delete new_thread;
1130 return JVMTI_ERROR_OUT_OF_MEMORY;
1131 }
1132
1133 java_lang_Thread::set_thread(thread_hndl(), new_thread);
1134 java_lang_Thread::set_priority(thread_hndl(), (ThreadPriority)priority);
1135 java_lang_Thread::set_daemon(thread_hndl());
1136
1137 new_thread->set_threadObj(thread_hndl());
1138 Threads::add(new_thread);
1139 Thread::start(new_thread);
1140 } // unlock Threads_lock
1141
1142 return JVMTI_ERROR_NONE;
1143 } /* end RunAgentThread */
1144
1145 //
1146 // Thread Group functions
1147 //
1148
1149 // group_count_ptr - pre-checked for NULL
1150 // groups_ptr - pre-checked for NULL
1151 jvmtiError
1152 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1153 JavaThread* current_thread = JavaThread::current();
1154
1155 // Only one top level thread group now.
1156 *group_count_ptr = 1;
1157
1158 // Allocate memory to store global-refs to the thread groups.
1159 // Assume this area is freed by caller.
1160 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1161
1162 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1163
1164 // Convert oop to Handle, then convert Handle to global-ref.
1165 {
1166 HandleMark hm(current_thread);
1167 Handle system_thread_group(current_thread, Universe::system_thread_group());
1168 *groups_ptr[0] = jni_reference(system_thread_group);
1169 }
1170
1171 return JVMTI_ERROR_NONE;
1172 } /* end GetTopThreadGroups */
1173
1174
1175 // info_ptr - pre-checked for NULL
1176 jvmtiError
1177 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1178 ResourceMark rm;
1179 HandleMark hm;
1180
1181 JavaThread* current_thread = JavaThread::current();
1182
1183 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1184 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1185
1186 typeArrayHandle name;
1187 Handle parent_group;
1188 bool is_daemon;
1189 ThreadPriority max_priority;
1190
1191 { MutexLocker mu(Threads_lock);
1192
1193 name = typeArrayHandle(current_thread,
1194 java_lang_ThreadGroup::name(group_obj()));
1195 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1196 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj());
1197 max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1198 }
1199
1200 info_ptr->is_daemon = is_daemon;
1201 info_ptr->max_priority = max_priority;
1202 info_ptr->parent = jni_reference(parent_group);
1203
1204 if (name() != NULL) {
1205 const char* n = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
1206 info_ptr->name = (char *)jvmtiMalloc(strlen(n)+1);
1207 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1208 strcpy(info_ptr->name, n);
1209 } else {
1210 info_ptr->name = NULL;
1211 }
1212
1213 return JVMTI_ERROR_NONE;
1214 } /* end GetThreadGroupInfo */
1215
1216
1217 // thread_count_ptr - pre-checked for NULL
1218 // threads_ptr - pre-checked for NULL
1219 // group_count_ptr - pre-checked for NULL
1220 // groups_ptr - pre-checked for NULL
1221 jvmtiError
1222 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1223 JavaThread* current_thread = JavaThread::current();
1224 oop group_obj = (oop) JNIHandles::resolve_external_guard(group);
1225 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1226
1227 Handle *thread_objs = NULL;
1228 Handle *group_objs = NULL;
1229 int nthreads = 0;
1230 int ngroups = 0;
1231 int hidden_threads = 0;
1232
1233 ResourceMark rm;
1234 HandleMark hm;
1235
1236 Handle group_hdl(current_thread, group_obj);
1237
1238 { MutexLocker mu(Threads_lock);
1239
1240 nthreads = java_lang_ThreadGroup::nthreads(group_hdl());
1241 ngroups = java_lang_ThreadGroup::ngroups(group_hdl());
1242
1243 if (nthreads > 0) {
1244 objArrayOop threads = java_lang_ThreadGroup::threads(group_hdl());
1245 assert(nthreads <= threads->length(), "too many threads");
1246 thread_objs = NEW_RESOURCE_ARRAY(Handle,nthreads);
1247 for (int i=0, j=0; i<nthreads; i++) {
1248 oop thread_obj = threads->obj_at(i);
1249 assert(thread_obj != NULL, "thread_obj is NULL");
1250 JavaThread *javathread = java_lang_Thread::thread(thread_obj);
1251 // Filter out hidden java threads.
1252 if (javathread != NULL && javathread->is_hidden_from_external_view()) {
1253 hidden_threads++;
1254 continue;
1255 }
1256 thread_objs[j++] = Handle(current_thread, thread_obj);
1257 }
1258 nthreads -= hidden_threads;
1259 }
1260 if (ngroups > 0) {
1261 objArrayOop groups = java_lang_ThreadGroup::groups(group_hdl());
1262 assert(ngroups <= groups->length(), "too many threads");
1263 group_objs = NEW_RESOURCE_ARRAY(Handle,ngroups);
1264 for (int i=0; i<ngroups; i++) {
1265 oop group_obj = groups->obj_at(i);
1266 assert(group_obj != NULL, "group_obj != NULL");
1267 group_objs[i] = Handle(current_thread, group_obj);
1268 }
1269 }
1270 }
1271
1272 // have to make global handles outside of Threads_lock
1273 *group_count_ptr = ngroups;
1274 *thread_count_ptr = nthreads;
1275 *threads_ptr = new_jthreadArray(nthreads, thread_objs);
1276 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs);
1277 if ((nthreads > 0) && (*threads_ptr == NULL)) {
1278 return JVMTI_ERROR_OUT_OF_MEMORY;
1279 }
1280 if ((ngroups > 0) && (*groups_ptr == NULL)) {
1281 return JVMTI_ERROR_OUT_OF_MEMORY;
1282 }
1283
1284 return JVMTI_ERROR_NONE;
1285 } /* end GetThreadGroupChildren */
1286
1287
1288 //
1289 // Stack Frame functions
1290 //
1291
1292 // Threads_lock NOT held, java_thread not protected by lock
1293 // java_thread - pre-checked
1294 // max_frame_count - pre-checked to be greater than or equal to 0
1295 // frame_buffer - pre-checked for NULL
1296 // count_ptr - pre-checked for NULL
1297 jvmtiError
1298 JvmtiEnv::GetStackTrace(JavaThread* java_thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1299 jvmtiError err = JVMTI_ERROR_NONE;
1300 uint32_t debug_bits = 0;
1301 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
1302 err = get_stack_trace(java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1303 } else {
1304 // JVMTI get stack trace at safepoint. Do not require target thread to
1305 // be suspended.
1306 VM_GetStackTrace op(this, java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1307 VMThread::execute(&op);
1308 err = op.result();
1309 }
1310
1311 return err;
1312 } /* end GetStackTrace */
1313
1314
1315 // max_frame_count - pre-checked to be greater than or equal to 0
1316 // stack_info_ptr - pre-checked for NULL
1317 // thread_count_ptr - pre-checked for NULL
1318 jvmtiError
1319 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1320 jvmtiError err = JVMTI_ERROR_NONE;
1321 JavaThread* calling_thread = JavaThread::current();
1322
1323 // JVMTI get stack traces at safepoint.
1324 VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1325 VMThread::execute(&op);
1326 *thread_count_ptr = op.final_thread_count();
1327 *stack_info_ptr = op.stack_info();
1328 err = op.result();
1329 return err;
1330 } /* end GetAllStackTraces */
1331
1332
1333 // thread_count - pre-checked to be greater than or equal to 0
1334 // thread_list - pre-checked for NULL
1335 // max_frame_count - pre-checked to be greater than or equal to 0
1336 // stack_info_ptr - pre-checked for NULL
1337 jvmtiError
1338 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1339 jvmtiError err = JVMTI_ERROR_NONE;
1340 // JVMTI get stack traces at safepoint.
1341 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1342 VMThread::execute(&op);
1343 err = op.result();
1344 if (err == JVMTI_ERROR_NONE) {
1345 *stack_info_ptr = op.stack_info();
1346 }
1347 return err;
1348 } /* end GetThreadListStackTraces */
1349
1350
1351 // Threads_lock NOT held, java_thread not protected by lock
1352 // java_thread - pre-checked
1353 // count_ptr - pre-checked for NULL
1354 jvmtiError
1355 JvmtiEnv::GetFrameCount(JavaThread* java_thread, jint* count_ptr) {
1356 jvmtiError err = JVMTI_ERROR_NONE;
1357
1358 // retrieve or create JvmtiThreadState.
1359 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1360 if (state == NULL) {
1361 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1362 }
1363 uint32_t debug_bits = 0;
1364 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
1365 err = get_frame_count(state, count_ptr);
1366 } else {
1367 // get java stack frame count at safepoint.
1368 VM_GetFrameCount op(this, state, count_ptr);
1369 VMThread::execute(&op);
1370 err = op.result();
1371 }
1372 return err;
1373 } /* end GetFrameCount */
1374
1375
1376 // Threads_lock NOT held, java_thread not protected by lock
1377 // java_thread - pre-checked
1378 jvmtiError
1379 JvmtiEnv::PopFrame(JavaThread* java_thread) {
1380 JavaThread* current_thread = JavaThread::current();
1381 HandleMark hm(current_thread);
1382 uint32_t debug_bits = 0;
1383
1384 // retrieve or create the state
1385 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1386 if (state == NULL) {
1387 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1388 }
1389
1390 // Check if java_thread is fully suspended
1391 if (!is_thread_fully_suspended(java_thread, true /* wait for suspend completion */, &debug_bits)) {
1392 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1393 }
1394 // Check to see if a PopFrame was already in progress
1395 if (java_thread->popframe_condition() != JavaThread::popframe_inactive) {
1396 // Probably possible for JVMTI clients to trigger this, but the
1397 // JPDA backend shouldn't allow this to happen
1398 return JVMTI_ERROR_INTERNAL;
1399 }
1400
1401 {
1402 // Was workaround bug
1403 // 4812902: popFrame hangs if the method is waiting at a synchronize
1404 // Catch this condition and return an error to avoid hanging.
1405 // Now JVMTI spec allows an implementation to bail out with an opaque frame error.
1406 OSThread* osThread = java_thread->osthread();
1407 if (osThread->get_state() == MONITOR_WAIT) {
1408 return JVMTI_ERROR_OPAQUE_FRAME;
1409 }
1410 }
1411
1412 {
1413 ResourceMark rm(current_thread);
1414 // Check if there are more than one Java frame in this thread, that the top two frames
1415 // are Java (not native) frames, and that there is no intervening VM frame
1416 int frame_count = 0;
1417 bool is_interpreted[2];
1418 intptr_t *frame_sp[2];
1419 // The 2-nd arg of constructor is needed to stop iterating at java entry frame.
1420 for (vframeStream vfs(java_thread, true); !vfs.at_end(); vfs.next()) {
1421 methodHandle mh(current_thread, vfs.method());
1422 if (mh->is_native()) return(JVMTI_ERROR_OPAQUE_FRAME);
1423 is_interpreted[frame_count] = vfs.is_interpreted_frame();
1424 frame_sp[frame_count] = vfs.frame_id();
1425 if (++frame_count > 1) break;
1426 }
1427 if (frame_count < 2) {
1428 // We haven't found two adjacent non-native Java frames on the top.
1429 // There can be two situations here:
1430 // 1. There are no more java frames
1431 // 2. Two top java frames are separated by non-java native frames
1432 if(vframeFor(java_thread, 1) == NULL) {
1433 return JVMTI_ERROR_NO_MORE_FRAMES;
1434 } else {
1435 // Intervening non-java native or VM frames separate java frames.
1436 // Current implementation does not support this. See bug #5031735.
1437 // In theory it is possible to pop frames in such cases.
1438 return JVMTI_ERROR_OPAQUE_FRAME;
1439 }
1440 }
1441
1442 // If any of the top 2 frames is a compiled one, need to deoptimize it
1443 for (int i = 0; i < 2; i++) {
1444 if (!is_interpreted[i]) {
1445 Deoptimization::deoptimize_frame(java_thread, frame_sp[i]);
1446 }
1447 }
1448
1449 // Update the thread state to reflect that the top frame is popped
1450 // so that cur_stack_depth is maintained properly and all frameIDs
1451 // are invalidated.
1452 // The current frame will be popped later when the suspended thread
1453 // is resumed and right before returning from VM to Java.
1454 // (see call_VM_base() in assembler_<cpu>.cpp).
1455
1456 // It's fine to update the thread state here because no JVMTI events
1457 // shall be posted for this PopFrame.
1458
1459 state->update_for_pop_top_frame();
1460 java_thread->set_popframe_condition(JavaThread::popframe_pending_bit);
1461 // Set pending step flag for this popframe and it is cleared when next
1462 // step event is posted.
1463 state->set_pending_step_for_popframe();
1464 }
1465
1466 return JVMTI_ERROR_NONE;
1467 } /* end PopFrame */
1468
1469
1470 // Threads_lock NOT held, java_thread not protected by lock
1471 // java_thread - pre-checked
1472 // java_thread - unchecked
1473 // depth - pre-checked as non-negative
1474 // method_ptr - pre-checked for NULL
1475 // location_ptr - pre-checked for NULL
1476 jvmtiError
1477 JvmtiEnv::GetFrameLocation(JavaThread* java_thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1478 jvmtiError err = JVMTI_ERROR_NONE;
1479 uint32_t debug_bits = 0;
1480
1481 if (is_thread_fully_suspended(java_thread, true, &debug_bits)) {
1482 err = get_frame_location(java_thread, depth, method_ptr, location_ptr);
1483 } else {
1484 // JVMTI get java stack frame location at safepoint.
1485 VM_GetFrameLocation op(this, java_thread, depth, method_ptr, location_ptr);
1486 VMThread::execute(&op);
1487 err = op.result();
1488 }
1489 return err;
1490 } /* end GetFrameLocation */
1491
1492
1493 // Threads_lock NOT held, java_thread not protected by lock
1494 // java_thread - pre-checked
1495 // java_thread - unchecked
1496 // depth - pre-checked as non-negative
1497 jvmtiError
1498 JvmtiEnv::NotifyFramePop(JavaThread* java_thread, jint depth) {
1499 ResourceMark rm;
1500 uint32_t debug_bits = 0;
1501
1502 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread);
1503 if (state == NULL) {
1504 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1505 }
1506
1507 if (!JvmtiEnv::is_thread_fully_suspended(java_thread, true, &debug_bits)) {
1508 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1509 }
1510
1511 if (TraceJVMTICalls) {
1512 JvmtiSuspendControl::print();
1513 }
1514
1515 vframe *vf = vframeFor(java_thread, depth);
1516 if (vf == NULL) {
1517 return JVMTI_ERROR_NO_MORE_FRAMES;
1518 }
1519
1520 if (!vf->is_java_frame() || ((javaVFrame*) vf)->method()->is_native()) {
1521 return JVMTI_ERROR_OPAQUE_FRAME;
1522 }
1523
1524 assert(vf->frame_pointer() != NULL, "frame pointer mustn't be NULL");
1525
1526 int frame_number = state->count_frames() - depth;
1527 state->env_thread_state(this)->set_frame_pop(frame_number);
1528
1529 return JVMTI_ERROR_NONE;
1530 } /* end NotifyFramePop */
1531
1532
1533 //
1534 // Force Early Return functions
1535 //
1536
1537 // Threads_lock NOT held, java_thread not protected by lock
1538 // java_thread - pre-checked
1539 jvmtiError
1540 JvmtiEnv::ForceEarlyReturnObject(JavaThread* java_thread, jobject value) {
1541 jvalue val;
1542 val.l = value;
1543 return force_early_return(java_thread, val, atos);
1544 } /* end ForceEarlyReturnObject */
1545
1546
1547 // Threads_lock NOT held, java_thread not protected by lock
1548 // java_thread - pre-checked
1549 jvmtiError
1550 JvmtiEnv::ForceEarlyReturnInt(JavaThread* java_thread, jint value) {
1551 jvalue val;
1552 val.i = value;
1553 return force_early_return(java_thread, val, itos);
1554 } /* end ForceEarlyReturnInt */
1555
1556
1557 // Threads_lock NOT held, java_thread not protected by lock
1558 // java_thread - pre-checked
1559 jvmtiError
1560 JvmtiEnv::ForceEarlyReturnLong(JavaThread* java_thread, jlong value) {
1561 jvalue val;
1562 val.j = value;
1563 return force_early_return(java_thread, val, ltos);
1564 } /* end ForceEarlyReturnLong */
1565
1566
1567 // Threads_lock NOT held, java_thread not protected by lock
1568 // java_thread - pre-checked
1569 jvmtiError
1570 JvmtiEnv::ForceEarlyReturnFloat(JavaThread* java_thread, jfloat value) {
1571 jvalue val;
1572 val.f = value;
1573 return force_early_return(java_thread, val, ftos);
1574 } /* end ForceEarlyReturnFloat */
1575
1576
1577 // Threads_lock NOT held, java_thread not protected by lock
1578 // java_thread - pre-checked
1579 jvmtiError
1580 JvmtiEnv::ForceEarlyReturnDouble(JavaThread* java_thread, jdouble value) {
1581 jvalue val;
1582 val.d = value;
1583 return force_early_return(java_thread, val, dtos);
1584 } /* end ForceEarlyReturnDouble */
1585
1586
1587 // Threads_lock NOT held, java_thread not protected by lock
1588 // java_thread - pre-checked
1589 jvmtiError
1590 JvmtiEnv::ForceEarlyReturnVoid(JavaThread* java_thread) {
1591 jvalue val;
1592 val.j = 0L;
1593 return force_early_return(java_thread, val, vtos);
1594 } /* end ForceEarlyReturnVoid */
1595
1596
1597 //
1598 // Heap functions
1599 //
1600
1601 // klass - NULL is a valid value, must be checked
1602 // initial_object - NULL is a valid value, must be checked
1603 // callbacks - pre-checked for NULL
1604 // user_data - NULL is a valid value, must be checked
1605 jvmtiError
1606 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1607 // check klass if provided
1608 Klass* k_oop = NULL;
1609 if (klass != NULL) {
1610 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1611 if (k_mirror == NULL) {
1612 return JVMTI_ERROR_INVALID_CLASS;
1613 }
1614 if (java_lang_Class::is_primitive(k_mirror)) {
1615 return JVMTI_ERROR_NONE;
1616 }
1617 k_oop = java_lang_Class::as_Klass(k_mirror);
1618 if (k_oop == NULL) {
1619 return JVMTI_ERROR_INVALID_CLASS;
1620 }
1621 }
1622
1623 Thread *thread = Thread::current();
1624 HandleMark hm(thread);
1625 KlassHandle kh (thread, k_oop);
1626
1627 TraceTime t("FollowReferences", TraceJVMTIObjectTagging);
1628 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, kh, initial_object, callbacks, user_data);
1629 return JVMTI_ERROR_NONE;
1630 } /* end FollowReferences */
1631
1632
1633 // klass - NULL is a valid value, must be checked
1634 // callbacks - pre-checked for NULL
1635 // user_data - NULL is a valid value, must be checked
1636 jvmtiError
1637 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1638 // check klass if provided
1639 Klass* k_oop = NULL;
1640 if (klass != NULL) {
1641 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1642 if (k_mirror == NULL) {
1643 return JVMTI_ERROR_INVALID_CLASS;
1644 }
1645 if (java_lang_Class::is_primitive(k_mirror)) {
1646 return JVMTI_ERROR_NONE;
1647 }
1648 k_oop = java_lang_Class::as_Klass(k_mirror);
1649 if (k_oop == NULL) {
1650 return JVMTI_ERROR_INVALID_CLASS;
1651 }
1652 }
1653
1654 Thread *thread = Thread::current();
1655 HandleMark hm(thread);
1656 KlassHandle kh (thread, k_oop);
1657
1658 TraceTime t("IterateThroughHeap", TraceJVMTIObjectTagging);
1659 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, kh, callbacks, user_data);
1660 return JVMTI_ERROR_NONE;
1661 } /* end IterateThroughHeap */
1662
1663
1664 // tag_ptr - pre-checked for NULL
1665 jvmtiError
1666 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
1667 oop o = JNIHandles::resolve_external_guard(object);
1668 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1669 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
1670 return JVMTI_ERROR_NONE;
1671 } /* end GetTag */
1672
1673
1674 jvmtiError
1675 JvmtiEnv::SetTag(jobject object, jlong tag) {
1676 oop o = JNIHandles::resolve_external_guard(object);
1677 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1678 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
1679 return JVMTI_ERROR_NONE;
1680 } /* end SetTag */
1681
1682
1683 // tag_count - pre-checked to be greater than or equal to 0
1684 // tags - pre-checked for NULL
1685 // count_ptr - pre-checked for NULL
1686 // object_result_ptr - NULL is a valid value, must be checked
1687 // tag_result_ptr - NULL is a valid value, must be checked
1688 jvmtiError
1689 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
1690 TraceTime t("GetObjectsWithTags", TraceJVMTIObjectTagging);
1691 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
1692 } /* end GetObjectsWithTags */
1693
1694
1695 jvmtiError
1696 JvmtiEnv::ForceGarbageCollection() {
1697 Universe::heap()->collect(GCCause::_jvmti_force_gc);
1698 return JVMTI_ERROR_NONE;
1699 } /* end ForceGarbageCollection */
1700
1701
1702 //
1703 // Heap (1.0) functions
1704 //
1705
1706 // object_reference_callback - pre-checked for NULL
1707 // user_data - NULL is a valid value, must be checked
1708 jvmtiError
1709 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
1710 oop o = JNIHandles::resolve_external_guard(object);
1711 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1712 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
1713 return JVMTI_ERROR_NONE;
1714 } /* end IterateOverObjectsReachableFromObject */
1715
1716
1717 // heap_root_callback - NULL is a valid value, must be checked
1718 // stack_ref_callback - NULL is a valid value, must be checked
1719 // object_ref_callback - NULL is a valid value, must be checked
1720 // user_data - NULL is a valid value, must be checked
1721 jvmtiError
1722 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
1723 TraceTime t("IterateOverReachableObjects", TraceJVMTIObjectTagging);
1724 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
1725 return JVMTI_ERROR_NONE;
1726 } /* end IterateOverReachableObjects */
1727
1728
1729 // heap_object_callback - pre-checked for NULL
1730 // user_data - NULL is a valid value, must be checked
1731 jvmtiError
1732 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
1733 TraceTime t("IterateOverHeap", TraceJVMTIObjectTagging);
1734 Thread *thread = Thread::current();
1735 HandleMark hm(thread);
1736 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, KlassHandle(), heap_object_callback, user_data);
1737 return JVMTI_ERROR_NONE;
1738 } /* end IterateOverHeap */
1739
1740
1741 // k_mirror - may be primitive, this must be checked
1742 // heap_object_callback - pre-checked for NULL
1743 // user_data - NULL is a valid value, must be checked
1744 jvmtiError
1745 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
1746 if (java_lang_Class::is_primitive(k_mirror)) {
1747 // DO PRIMITIVE CLASS PROCESSING
1748 return JVMTI_ERROR_NONE;
1749 }
1750 Klass* k_oop = java_lang_Class::as_Klass(k_mirror);
1751 if (k_oop == NULL) {
1752 return JVMTI_ERROR_INVALID_CLASS;
1753 }
1754 Thread *thread = Thread::current();
1755 HandleMark hm(thread);
1756 KlassHandle klass (thread, k_oop);
1757 TraceTime t("IterateOverInstancesOfClass", TraceJVMTIObjectTagging);
1758 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
1759 return JVMTI_ERROR_NONE;
1760 } /* end IterateOverInstancesOfClass */
1761
1762
1763 //
1764 // Local Variable functions
1765 //
1766
1767 // Threads_lock NOT held, java_thread not protected by lock
1768 // java_thread - pre-checked
1769 // java_thread - unchecked
1770 // depth - pre-checked as non-negative
1771 // value_ptr - pre-checked for NULL
1772 jvmtiError
1773 JvmtiEnv::GetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject* value_ptr) {
1774 JavaThread* current_thread = JavaThread::current();
1775 // rm object is created to clean up the javaVFrame created in
1776 // doit_prologue(), but after doit() is finished with it.
1777 ResourceMark rm(current_thread);
1778
1779 VM_GetOrSetLocal op(java_thread, current_thread, depth, slot);
1780 VMThread::execute(&op);
1781 jvmtiError err = op.result();
1782 if (err != JVMTI_ERROR_NONE) {
1783 return err;
1784 } else {
1785 *value_ptr = op.value().l;
1786 return JVMTI_ERROR_NONE;
1787 }
1788 } /* end GetLocalObject */
1789
1790 // Threads_lock NOT held, java_thread not protected by lock
1791 // java_thread - pre-checked
1792 // java_thread - unchecked
1793 // depth - pre-checked as non-negative
1794 // value - pre-checked for NULL
1795 jvmtiError
1796 JvmtiEnv::GetLocalInstance(JavaThread* java_thread, jint depth, jobject* value_ptr){
1797 JavaThread* current_thread = JavaThread::current();
1798 // rm object is created to clean up the javaVFrame created in
1799 // doit_prologue(), but after doit() is finished with it.
1800 ResourceMark rm(current_thread);
1801
1802 VM_GetReceiver op(java_thread, current_thread, depth);
1803 VMThread::execute(&op);
1804 jvmtiError err = op.result();
1805 if (err != JVMTI_ERROR_NONE) {
1806 return err;
1807 } else {
1808 *value_ptr = op.value().l;
1809 return JVMTI_ERROR_NONE;
1810 }
1811 } /* end GetLocalInstance */
1812
1813
1814 // Threads_lock NOT held, java_thread not protected by lock
1815 // java_thread - pre-checked
1816 // java_thread - unchecked
1817 // depth - pre-checked as non-negative
1818 // value_ptr - pre-checked for NULL
1819 jvmtiError
1820 JvmtiEnv::GetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint* value_ptr) {
1821 // rm object is created to clean up the javaVFrame created in
1822 // doit_prologue(), but after doit() is finished with it.
1823 ResourceMark rm;
1824
1825 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT);
1826 VMThread::execute(&op);
1827 *value_ptr = op.value().i;
1828 return op.result();
1829 } /* end GetLocalInt */
1830
1831
1832 // Threads_lock NOT held, java_thread not protected by lock
1833 // java_thread - pre-checked
1834 // java_thread - unchecked
1835 // depth - pre-checked as non-negative
1836 // value_ptr - pre-checked for NULL
1837 jvmtiError
1838 JvmtiEnv::GetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong* value_ptr) {
1839 // rm object is created to clean up the javaVFrame created in
1840 // doit_prologue(), but after doit() is finished with it.
1841 ResourceMark rm;
1842
1843 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG);
1844 VMThread::execute(&op);
1845 *value_ptr = op.value().j;
1846 return op.result();
1847 } /* end GetLocalLong */
1848
1849
1850 // Threads_lock NOT held, java_thread not protected by lock
1851 // java_thread - pre-checked
1852 // java_thread - unchecked
1853 // depth - pre-checked as non-negative
1854 // value_ptr - pre-checked for NULL
1855 jvmtiError
1856 JvmtiEnv::GetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat* value_ptr) {
1857 // rm object is created to clean up the javaVFrame created in
1858 // doit_prologue(), but after doit() is finished with it.
1859 ResourceMark rm;
1860
1861 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT);
1862 VMThread::execute(&op);
1863 *value_ptr = op.value().f;
1864 return op.result();
1865 } /* end GetLocalFloat */
1866
1867
1868 // Threads_lock NOT held, java_thread not protected by lock
1869 // java_thread - pre-checked
1870 // java_thread - unchecked
1871 // depth - pre-checked as non-negative
1872 // value_ptr - pre-checked for NULL
1873 jvmtiError
1874 JvmtiEnv::GetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble* value_ptr) {
1875 // rm object is created to clean up the javaVFrame created in
1876 // doit_prologue(), but after doit() is finished with it.
1877 ResourceMark rm;
1878
1879 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE);
1880 VMThread::execute(&op);
1881 *value_ptr = op.value().d;
1882 return op.result();
1883 } /* end GetLocalDouble */
1884
1885
1886 // Threads_lock NOT held, java_thread not protected by lock
1887 // java_thread - pre-checked
1888 // java_thread - unchecked
1889 // depth - pre-checked as non-negative
1890 jvmtiError
1891 JvmtiEnv::SetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject value) {
1892 // rm object is created to clean up the javaVFrame created in
1893 // doit_prologue(), but after doit() is finished with it.
1894 ResourceMark rm;
1895 jvalue val;
1896 val.l = value;
1897 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val);
1898 VMThread::execute(&op);
1899 return op.result();
1900 } /* end SetLocalObject */
1901
1902
1903 // Threads_lock NOT held, java_thread not protected by lock
1904 // java_thread - pre-checked
1905 // java_thread - unchecked
1906 // depth - pre-checked as non-negative
1907 jvmtiError
1908 JvmtiEnv::SetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint value) {
1909 // rm object is created to clean up the javaVFrame created in
1910 // doit_prologue(), but after doit() is finished with it.
1911 ResourceMark rm;
1912 jvalue val;
1913 val.i = value;
1914 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val);
1915 VMThread::execute(&op);
1916 return op.result();
1917 } /* end SetLocalInt */
1918
1919
1920 // Threads_lock NOT held, java_thread not protected by lock
1921 // java_thread - pre-checked
1922 // java_thread - unchecked
1923 // depth - pre-checked as non-negative
1924 jvmtiError
1925 JvmtiEnv::SetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong value) {
1926 // rm object is created to clean up the javaVFrame created in
1927 // doit_prologue(), but after doit() is finished with it.
1928 ResourceMark rm;
1929 jvalue val;
1930 val.j = value;
1931 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val);
1932 VMThread::execute(&op);
1933 return op.result();
1934 } /* end SetLocalLong */
1935
1936
1937 // Threads_lock NOT held, java_thread not protected by lock
1938 // java_thread - pre-checked
1939 // java_thread - unchecked
1940 // depth - pre-checked as non-negative
1941 jvmtiError
1942 JvmtiEnv::SetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat value) {
1943 // rm object is created to clean up the javaVFrame created in
1944 // doit_prologue(), but after doit() is finished with it.
1945 ResourceMark rm;
1946 jvalue val;
1947 val.f = value;
1948 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val);
1949 VMThread::execute(&op);
1950 return op.result();
1951 } /* end SetLocalFloat */
1952
1953
1954 // Threads_lock NOT held, java_thread not protected by lock
1955 // java_thread - pre-checked
1956 // java_thread - unchecked
1957 // depth - pre-checked as non-negative
1958 jvmtiError
1959 JvmtiEnv::SetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble value) {
1960 // rm object is created to clean up the javaVFrame created in
1961 // doit_prologue(), but after doit() is finished with it.
1962 ResourceMark rm;
1963 jvalue val;
1964 val.d = value;
1965 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val);
1966 VMThread::execute(&op);
1967 return op.result();
1968 } /* end SetLocalDouble */
1969
1970
1971 //
1972 // Breakpoint functions
1973 //
1974
1975 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
1976 jvmtiError
1977 JvmtiEnv::SetBreakpoint(Method* method_oop, jlocation location) {
1978 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
1979 if (location < 0) { // simple invalid location check first
1980 return JVMTI_ERROR_INVALID_LOCATION;
1981 }
1982 // verify that the breakpoint is not past the end of the method
1983 if (location >= (jlocation) method_oop->code_size()) {
1984 return JVMTI_ERROR_INVALID_LOCATION;
1985 }
1986
1987 ResourceMark rm;
1988 JvmtiBreakpoint bp(method_oop, location);
1989 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
1990 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
1991 return JVMTI_ERROR_DUPLICATE;
1992
1993 if (TraceJVMTICalls) {
1994 jvmti_breakpoints.print();
1995 }
1996
1997 return JVMTI_ERROR_NONE;
1998 } /* end SetBreakpoint */
1999
2000
2001 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2002 jvmtiError
2003 JvmtiEnv::ClearBreakpoint(Method* method_oop, jlocation location) {
2004 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2005
2006 if (location < 0) { // simple invalid location check first
2007 return JVMTI_ERROR_INVALID_LOCATION;
2008 }
2009
2010 // verify that the breakpoint is not past the end of the method
2011 if (location >= (jlocation) method_oop->code_size()) {
2012 return JVMTI_ERROR_INVALID_LOCATION;
2013 }
2014
2015 JvmtiBreakpoint bp(method_oop, location);
2016
2017 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2018 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2019 return JVMTI_ERROR_NOT_FOUND;
2020
2021 if (TraceJVMTICalls) {
2022 jvmti_breakpoints.print();
2023 }
2024
2025 return JVMTI_ERROR_NONE;
2026 } /* end ClearBreakpoint */
2027
2028
2029 //
2030 // Watched Field functions
2031 //
2032
2033 jvmtiError
2034 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2035 // make sure we haven't set this watch before
2036 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2037 fdesc_ptr->set_is_field_access_watched(true);
2038
2039 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2040
2041 return JVMTI_ERROR_NONE;
2042 } /* end SetFieldAccessWatch */
2043
2044
2045 jvmtiError
2046 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2047 // make sure we have a watch to clear
2048 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2049 fdesc_ptr->set_is_field_access_watched(false);
2050
2051 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2052
2053 return JVMTI_ERROR_NONE;
2054 } /* end ClearFieldAccessWatch */
2055
2056
2057 jvmtiError
2058 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2059 // make sure we haven't set this watch before
2060 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2061 fdesc_ptr->set_is_field_modification_watched(true);
2062
2063 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2064
2065 return JVMTI_ERROR_NONE;
2066 } /* end SetFieldModificationWatch */
2067
2068
2069 jvmtiError
2070 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2071 // make sure we have a watch to clear
2072 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2073 fdesc_ptr->set_is_field_modification_watched(false);
2074
2075 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2076
2077 return JVMTI_ERROR_NONE;
2078 } /* end ClearFieldModificationWatch */
2079
2080 //
2081 // Class functions
2082 //
2083
2084
2085 // k_mirror - may be primitive, this must be checked
2086 // signature_ptr - NULL is a valid value, must be checked
2087 // generic_ptr - NULL is a valid value, must be checked
2088 jvmtiError
2089 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2090 ResourceMark rm;
2091 bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2092 Klass* k = NULL;
2093 if (!isPrimitive) {
2094 k = java_lang_Class::as_Klass(k_mirror);
2095 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2096 }
2097 if (signature_ptr != NULL) {
2098 char* result = NULL;
2099 if (isPrimitive) {
2100 char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2101 result = (char*) jvmtiMalloc(2);
2102 result[0] = tchar;
2103 result[1] = '\0';
2104 } else {
2105 const char* class_sig = k->signature_name();
2106 result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2107 strcpy(result, class_sig);
2108 }
2109 *signature_ptr = result;
2110 }
2111 if (generic_ptr != NULL) {
2112 *generic_ptr = NULL;
2113 if (!isPrimitive && k->oop_is_instance()) {
2114 Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2115 if (soo != NULL) {
2116 const char *gen_sig = soo->as_C_string();
2117 if (gen_sig != NULL) {
2118 char* gen_result;
2119 jvmtiError err = allocate(strlen(gen_sig) + 1,
2120 (unsigned char **)&gen_result);
2121 if (err != JVMTI_ERROR_NONE) {
2122 return err;
2123 }
2124 strcpy(gen_result, gen_sig);
2125 *generic_ptr = gen_result;
2126 }
2127 }
2128 }
2129 }
2130 return JVMTI_ERROR_NONE;
2131 } /* end GetClassSignature */
2132
2133
2134 // k_mirror - may be primitive, this must be checked
2135 // status_ptr - pre-checked for NULL
2136 jvmtiError
2137 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2138 jint result = 0;
2139 if (java_lang_Class::is_primitive(k_mirror)) {
2140 result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2141 } else {
2142 Klass* k = java_lang_Class::as_Klass(k_mirror);
2143 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2144 result = k->jvmti_class_status();
2145 }
2146 *status_ptr = result;
2147
2148 return JVMTI_ERROR_NONE;
2149 } /* end GetClassStatus */
2150
2151
2152 // k_mirror - may be primitive, this must be checked
2153 // source_name_ptr - pre-checked for NULL
2154 jvmtiError
2155 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2156 if (java_lang_Class::is_primitive(k_mirror)) {
2157 return JVMTI_ERROR_ABSENT_INFORMATION;
2158 }
2159 Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2160 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2161
2162 if (!k_klass->oop_is_instance()) {
2163 return JVMTI_ERROR_ABSENT_INFORMATION;
2164 }
2165
2166 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2167 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2168 {
2169 JavaThread* current_thread = JavaThread::current();
2170 ResourceMark rm(current_thread);
2171 const char* sfncp = (const char*) sfnOop->as_C_string();
2172 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2173 strcpy(*source_name_ptr, sfncp);
2174 }
2175
2176 return JVMTI_ERROR_NONE;
2177 } /* end GetSourceFileName */
2178
2179
2180 // k_mirror - may be primitive, this must be checked
2181 // modifiers_ptr - pre-checked for NULL
2182 jvmtiError
2183 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2184 JavaThread* current_thread = JavaThread::current();
2185 jint result = 0;
2186 if (!java_lang_Class::is_primitive(k_mirror)) {
2187 Klass* k = java_lang_Class::as_Klass(k_mirror);
2188 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2189 result = k->compute_modifier_flags(current_thread);
2190 JavaThread* THREAD = current_thread; // pass to macros
2191 if (HAS_PENDING_EXCEPTION) {
2192 CLEAR_PENDING_EXCEPTION;
2193 return JVMTI_ERROR_INTERNAL;
2194 };
2195
2196 // Reset the deleted ACC_SUPER bit ( deleted in compute_modifier_flags()).
2197 if(k->is_super()) {
2198 result |= JVM_ACC_SUPER;
2199 }
2200 } else {
2201 result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
2202 }
2203 *modifiers_ptr = result;
2204
2205 return JVMTI_ERROR_NONE;
2206 } /* end GetClassModifiers */
2207
2208
2209 // k_mirror - may be primitive, this must be checked
2210 // method_count_ptr - pre-checked for NULL
2211 // methods_ptr - pre-checked for NULL
2212 jvmtiError
2213 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2214 JavaThread* current_thread = JavaThread::current();
2215 HandleMark hm(current_thread);
2216
2217 if (java_lang_Class::is_primitive(k_mirror)) {
2218 *method_count_ptr = 0;
2219 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2220 return JVMTI_ERROR_NONE;
2221 }
2222 Klass* k = java_lang_Class::as_Klass(k_mirror);
2223 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2224
2225 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2226 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2227 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2228 }
2229
2230 if (!k->oop_is_instance()) {
2231 *method_count_ptr = 0;
2232 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2233 return JVMTI_ERROR_NONE;
2234 }
2235 instanceKlassHandle instanceK_h(current_thread, k);
2236 // Allocate the result and fill it in
2237 int result_length = instanceK_h->methods()->length();
2238 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2239 int index;
2240 if (JvmtiExport::can_maintain_original_method_order()) {
2241 // Use the original method ordering indices stored in the class, so we can emit
2242 // jmethodIDs in the order they appeared in the class file
2243 for (index = 0; index < result_length; index++) {
2244 Method* m = instanceK_h->methods()->at(index);
2245 int original_index = instanceK_h->method_ordering()->at(index);
2246 assert(original_index >= 0 && original_index < result_length, "invalid original method index");
2247 jmethodID id = m->jmethod_id();
2248 result_list[original_index] = id;
2249 }
2250 } else {
2251 // otherwise just copy in any order
2252 for (index = 0; index < result_length; index++) {
2253 Method* m = instanceK_h->methods()->at(index);
2254 jmethodID id = m->jmethod_id();
2255 result_list[index] = id;
2256 }
2257 }
2258 // Fill in return value.
2259 *method_count_ptr = result_length;
2260 *methods_ptr = result_list;
2261
2262 return JVMTI_ERROR_NONE;
2263 } /* end GetClassMethods */
2264
2265
2266 // k_mirror - may be primitive, this must be checked
2267 // field_count_ptr - pre-checked for NULL
2268 // fields_ptr - pre-checked for NULL
2269 jvmtiError
2270 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2271 if (java_lang_Class::is_primitive(k_mirror)) {
2272 *field_count_ptr = 0;
2273 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2274 return JVMTI_ERROR_NONE;
2275 }
2276 JavaThread* current_thread = JavaThread::current();
2277 HandleMark hm(current_thread);
2278 Klass* k = java_lang_Class::as_Klass(k_mirror);
2279 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2280
2281 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2282 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2283 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2284 }
2285
2286 if (!k->oop_is_instance()) {
2287 *field_count_ptr = 0;
2288 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2289 return JVMTI_ERROR_NONE;
2290 }
2291
2292
2293 instanceKlassHandle instanceK_h(current_thread, k);
2294
2295 int result_count = 0;
2296 // First, count the fields.
2297 FilteredFieldStream flds(instanceK_h, true, true);
2298 result_count = flds.field_count();
2299
2300 // Allocate the result and fill it in
2301 jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID));
2302 // The JVMTI spec requires fields in the order they occur in the class file,
2303 // this is the reverse order of what FieldStream hands out.
2304 int id_index = (result_count - 1);
2305
2306 for (FilteredFieldStream src_st(instanceK_h, true, true); !src_st.eos(); src_st.next()) {
2307 result_list[id_index--] = jfieldIDWorkaround::to_jfieldID(
2308 instanceK_h, src_st.offset(),
2309 src_st.access_flags().is_static());
2310 }
2311 assert(id_index == -1, "just checking");
2312 // Fill in the results
2313 *field_count_ptr = result_count;
2314 *fields_ptr = result_list;
2315
2316 return JVMTI_ERROR_NONE;
2317 } /* end GetClassFields */
2318
2319
2320 // k_mirror - may be primitive, this must be checked
2321 // interface_count_ptr - pre-checked for NULL
2322 // interfaces_ptr - pre-checked for NULL
2323 jvmtiError
2324 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
2325 {
2326 if (java_lang_Class::is_primitive(k_mirror)) {
2327 *interface_count_ptr = 0;
2328 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2329 return JVMTI_ERROR_NONE;
2330 }
2331 JavaThread* current_thread = JavaThread::current();
2332 HandleMark hm(current_thread);
2333 Klass* k = java_lang_Class::as_Klass(k_mirror);
2334 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2335
2336 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2337 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
2338 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2339
2340 if (!k->oop_is_instance()) {
2341 *interface_count_ptr = 0;
2342 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2343 return JVMTI_ERROR_NONE;
2344 }
2345
2346 Array<Klass*>* interface_list = InstanceKlass::cast(k)->local_interfaces();
2347 const int result_length = (interface_list == NULL ? 0 : interface_list->length());
2348 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
2349 for (int i_index = 0; i_index < result_length; i_index += 1) {
2350 Klass* klass_at = interface_list->at(i_index);
2351 assert(klass_at->is_klass(), "interfaces must be Klass*s");
2352 assert(klass_at->is_interface(), "interfaces must be interfaces");
2353 oop mirror_at = klass_at->java_mirror();
2354 Handle handle_at = Handle(current_thread, mirror_at);
2355 result_list[i_index] = (jclass) jni_reference(handle_at);
2356 }
2357 *interface_count_ptr = result_length;
2358 *interfaces_ptr = result_list;
2359 }
2360
2361 return JVMTI_ERROR_NONE;
2362 } /* end GetImplementedInterfaces */
2363
2364
2365 // k_mirror - may be primitive, this must be checked
2366 // minor_version_ptr - pre-checked for NULL
2367 // major_version_ptr - pre-checked for NULL
2368 jvmtiError
2369 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
2370 if (java_lang_Class::is_primitive(k_mirror)) {
2371 return JVMTI_ERROR_ABSENT_INFORMATION;
2372 }
2373 Klass* k_oop = java_lang_Class::as_Klass(k_mirror);
2374 Thread *thread = Thread::current();
2375 HandleMark hm(thread);
2376 KlassHandle klass(thread, k_oop);
2377
2378 jint status = klass->jvmti_class_status();
2379 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2380 return JVMTI_ERROR_INVALID_CLASS;
2381 }
2382 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2383 return JVMTI_ERROR_ABSENT_INFORMATION;
2384 }
2385
2386 instanceKlassHandle ik(thread, k_oop);
2387 *minor_version_ptr = ik->minor_version();
2388 *major_version_ptr = ik->major_version();
2389
2390 return JVMTI_ERROR_NONE;
2391 } /* end GetClassVersionNumbers */
2392
2393
2394 // k_mirror - may be primitive, this must be checked
2395 // constant_pool_count_ptr - pre-checked for NULL
2396 // constant_pool_byte_count_ptr - pre-checked for NULL
2397 // constant_pool_bytes_ptr - pre-checked for NULL
2398 jvmtiError
2399 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
2400 if (java_lang_Class::is_primitive(k_mirror)) {
2401 return JVMTI_ERROR_ABSENT_INFORMATION;
2402 }
2403
2404 Klass* k_oop = java_lang_Class::as_Klass(k_mirror);
2405 Thread *thread = Thread::current();
2406 HandleMark hm(thread);
2407 ResourceMark rm(thread);
2408 KlassHandle klass(thread, k_oop);
2409
2410 jint status = klass->jvmti_class_status();
2411 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2412 return JVMTI_ERROR_INVALID_CLASS;
2413 }
2414 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2415 return JVMTI_ERROR_ABSENT_INFORMATION;
2416 }
2417
2418 instanceKlassHandle ikh(thread, k_oop);
2419 constantPoolHandle constants(thread, ikh->constants());
2420 MonitorLockerEx ml(constants->lock()); // 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 */