1 /*
2 * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoaderExt.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/modules.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "interpreter/bytecodeStream.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvmtifiles/jvmtiEnv.hpp"
35 #include "logging/log.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "memory/universe.inline.hpp"
39 #include "oops/instanceKlass.hpp"
40 #include "oops/objArrayOop.inline.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "prims/jniCheck.hpp"
43 #include "prims/jvm_misc.hpp"
44 #include "prims/jvmtiAgentThread.hpp"
45 #include "prims/jvmtiClassFileReconstituter.hpp"
46 #include "prims/jvmtiCodeBlobEvents.hpp"
47 #include "prims/jvmtiExtensions.hpp"
48 #include "prims/jvmtiGetLoadedClasses.hpp"
49 #include "prims/jvmtiHeapTransition.hpp"
50 #include "prims/jvmtiImpl.hpp"
51 #include "prims/jvmtiManageCapabilities.hpp"
52 #include "prims/jvmtiRawMonitor.hpp"
53 #include "prims/jvmtiRedefineClasses.hpp"
54 #include "prims/jvmtiTagMap.hpp"
55 #include "prims/jvmtiThreadState.inline.hpp"
56 #include "prims/jvmtiUtil.hpp"
57 #include "runtime/arguments.hpp"
58 #include "runtime/deoptimization.hpp"
59 #include "runtime/heapMonitoring.hpp"
60 #include "runtime/interfaceSupport.hpp"
61 #include "runtime/javaCalls.hpp"
62 #include "runtime/jfieldIDWorkaround.hpp"
63 #include "runtime/osThread.hpp"
64 #include "runtime/reflectionUtils.hpp"
65 #include "runtime/signature.hpp"
66 #include "runtime/thread.inline.hpp"
67 #include "runtime/timerTrace.hpp"
68 #include "runtime/vframe.hpp"
69 #include "runtime/vmThread.hpp"
70 #include "services/threadService.hpp"
71 #include "utilities/exceptions.hpp"
72 #include "utilities/preserveException.hpp"
73
74
75 #define FIXLATER 0 // REMOVE this when completed.
76
77 // FIXLATER: hook into JvmtiTrace
78 #define TraceJVMTICalls false
79
80 JvmtiEnv::JvmtiEnv(jint version) : JvmtiEnvBase(version) {
81 }
82
83 JvmtiEnv::~JvmtiEnv() {
84 }
85
86 JvmtiEnv*
87 JvmtiEnv::create_a_jvmti(jint version) {
88 return new JvmtiEnv(version);
89 }
90
91 // VM operation class to copy jni function table at safepoint.
92 // More than one java threads or jvmti agents may be reading/
93 // modifying jni function tables. To reduce the risk of bad
94 // interaction b/w these threads it is copied at safepoint.
95 class VM_JNIFunctionTableCopier : public VM_Operation {
96 private:
97 const struct JNINativeInterface_ *_function_table;
98 public:
99 VM_JNIFunctionTableCopier(const struct JNINativeInterface_ *func_tbl) {
100 _function_table = func_tbl;
101 };
102
103 VMOp_Type type() const { return VMOp_JNIFunctionTableCopier; }
104 void doit() {
105 copy_jni_function_table(_function_table);
106 };
107 };
108
109 //
110 // Do not change the "prefix" marker below, everything above it is copied
111 // unchanged into the filled stub, everything below is controlled by the
112 // stub filler (only method bodies are carried forward, and then only for
113 // functionality still in the spec).
114 //
115 // end file prefix
116
117 //
118 // Memory Management functions
119 //
120
121 // mem_ptr - pre-checked for NULL
122 jvmtiError
123 JvmtiEnv::Allocate(jlong size, unsigned char** mem_ptr) {
124 return allocate(size, mem_ptr);
125 } /* end Allocate */
126
127
128 // mem - NULL is a valid value, must be checked
129 jvmtiError
130 JvmtiEnv::Deallocate(unsigned char* mem) {
131 return deallocate(mem);
132 } /* end Deallocate */
133
134 // Threads_lock NOT held, java_thread not protected by lock
135 // java_thread - pre-checked
136 // data - NULL is a valid value, must be checked
137 jvmtiError
138 JvmtiEnv::SetThreadLocalStorage(JavaThread* java_thread, const void* data) {
139 JvmtiThreadState* state = java_thread->jvmti_thread_state();
140 if (state == NULL) {
141 if (data == NULL) {
142 // leaving state unset same as data set to NULL
143 return JVMTI_ERROR_NONE;
144 }
145 // otherwise, create the state
146 state = JvmtiThreadState::state_for(java_thread);
147 if (state == NULL) {
148 return JVMTI_ERROR_THREAD_NOT_ALIVE;
149 }
150 }
151 state->env_thread_state(this)->set_agent_thread_local_storage_data((void*)data);
152 return JVMTI_ERROR_NONE;
153 } /* end SetThreadLocalStorage */
154
155
156 // Threads_lock NOT held
157 // thread - NOT pre-checked
158 // data_ptr - pre-checked for NULL
159 jvmtiError
160 JvmtiEnv::GetThreadLocalStorage(jthread thread, void** data_ptr) {
161 JavaThread* current_thread = JavaThread::current();
162 if (thread == NULL) {
163 JvmtiThreadState* state = current_thread->jvmti_thread_state();
164 *data_ptr = (state == NULL) ? NULL :
165 state->env_thread_state(this)->get_agent_thread_local_storage_data();
166 } else {
167
168 // jvmti_GetThreadLocalStorage is "in native" and doesn't transition
169 // the thread to _thread_in_vm. However, when the TLS for a thread
170 // other than the current thread is required we need to transition
171 // from native so as to resolve the jthread.
172
173 ThreadInVMfromNative __tiv(current_thread);
174 VM_ENTRY_BASE(jvmtiError, JvmtiEnv::GetThreadLocalStorage , current_thread)
175 debug_only(VMNativeEntryWrapper __vew;)
176
177 oop thread_oop = JNIHandles::resolve_external_guard(thread);
178 if (thread_oop == NULL) {
179 return JVMTI_ERROR_INVALID_THREAD;
180 }
181 if (!thread_oop->is_a(SystemDictionary::Thread_klass())) {
182 return JVMTI_ERROR_INVALID_THREAD;
183 }
184 JavaThread* java_thread = java_lang_Thread::thread(thread_oop);
185 if (java_thread == NULL) {
186 return JVMTI_ERROR_THREAD_NOT_ALIVE;
187 }
188 JvmtiThreadState* state = java_thread->jvmti_thread_state();
189 *data_ptr = (state == NULL) ? NULL :
190 state->env_thread_state(this)->get_agent_thread_local_storage_data();
191 }
192 return JVMTI_ERROR_NONE;
193 } /* end GetThreadLocalStorage */
194
195 //
196 // Module functions
197 //
198
199 // module_count_ptr - pre-checked for NULL
200 // modules_ptr - pre-checked for NULL
201 jvmtiError
202 JvmtiEnv::GetAllModules(jint* module_count_ptr, jobject** modules_ptr) {
203 JvmtiModuleClosure jmc;
204
205 return jmc.get_all_modules(this, module_count_ptr, modules_ptr);
206 } /* end GetAllModules */
207
208
209 // class_loader - NULL is a valid value, must be pre-checked
210 // package_name - pre-checked for NULL
211 // module_ptr - pre-checked for NULL
212 jvmtiError
213 JvmtiEnv::GetNamedModule(jobject class_loader, const char* package_name, jobject* module_ptr) {
214 JavaThread* THREAD = JavaThread::current(); // pass to macros
215 ResourceMark rm(THREAD);
216
217 Handle h_loader (THREAD, JNIHandles::resolve(class_loader));
218 // Check that loader is a subclass of java.lang.ClassLoader.
219 if (h_loader.not_null() && !java_lang_ClassLoader::is_subclass(h_loader->klass())) {
220 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
221 }
222 jobject module = Modules::get_named_module(h_loader, package_name, THREAD);
223 if (HAS_PENDING_EXCEPTION) {
224 CLEAR_PENDING_EXCEPTION;
225 return JVMTI_ERROR_INTERNAL; // unexpected exception
226 }
227 *module_ptr = module;
228 return JVMTI_ERROR_NONE;
229 } /* end GetNamedModule */
230
231
232 // module - pre-checked for NULL
233 // to_module - pre-checked for NULL
234 jvmtiError
235 JvmtiEnv::AddModuleReads(jobject module, jobject to_module) {
236 JavaThread* THREAD = JavaThread::current();
237
238 // check module
239 Handle h_module(THREAD, JNIHandles::resolve(module));
240 if (!java_lang_Module::is_instance(h_module())) {
241 return JVMTI_ERROR_INVALID_MODULE;
242 }
243 // check to_module
244 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
245 if (!java_lang_Module::is_instance(h_to_module())) {
246 return JVMTI_ERROR_INVALID_MODULE;
247 }
248 return JvmtiExport::add_module_reads(h_module, h_to_module, THREAD);
249 } /* end AddModuleReads */
250
251
252 // module - pre-checked for NULL
253 // pkg_name - pre-checked for NULL
254 // to_module - pre-checked for NULL
255 jvmtiError
256 JvmtiEnv::AddModuleExports(jobject module, const char* pkg_name, jobject to_module) {
257 JavaThread* THREAD = JavaThread::current();
258 Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD);
259
260 // check module
261 Handle h_module(THREAD, JNIHandles::resolve(module));
262 if (!java_lang_Module::is_instance(h_module())) {
263 return JVMTI_ERROR_INVALID_MODULE;
264 }
265 // check to_module
266 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
267 if (!java_lang_Module::is_instance(h_to_module())) {
268 return JVMTI_ERROR_INVALID_MODULE;
269 }
270 return JvmtiExport::add_module_exports(h_module, h_pkg, h_to_module, THREAD);
271 } /* end AddModuleExports */
272
273
274 // module - pre-checked for NULL
275 // pkg_name - pre-checked for NULL
276 // to_module - pre-checked for NULL
277 jvmtiError
278 JvmtiEnv::AddModuleOpens(jobject module, const char* pkg_name, jobject to_module) {
279 JavaThread* THREAD = JavaThread::current();
280 Handle h_pkg = java_lang_String::create_from_str(pkg_name, THREAD);
281
282 // check module
283 Handle h_module(THREAD, JNIHandles::resolve(module));
284 if (!java_lang_Module::is_instance(h_module())) {
285 return JVMTI_ERROR_INVALID_MODULE;
286 }
287 // check to_module
288 Handle h_to_module(THREAD, JNIHandles::resolve(to_module));
289 if (!java_lang_Module::is_instance(h_to_module())) {
290 return JVMTI_ERROR_INVALID_MODULE;
291 }
292 return JvmtiExport::add_module_opens(h_module, h_pkg, h_to_module, THREAD);
293 } /* end AddModuleOpens */
294
295
296 // module - pre-checked for NULL
297 // service - pre-checked for NULL
298 jvmtiError
299 JvmtiEnv::AddModuleUses(jobject module, jclass service) {
300 JavaThread* THREAD = JavaThread::current();
301
302 // check module
303 Handle h_module(THREAD, JNIHandles::resolve(module));
304 if (!java_lang_Module::is_instance(h_module())) {
305 return JVMTI_ERROR_INVALID_MODULE;
306 }
307 // check service
308 Handle h_service(THREAD, JNIHandles::resolve_external_guard(service));
309 if (!java_lang_Class::is_instance(h_service()) ||
310 java_lang_Class::is_primitive(h_service())) {
311 return JVMTI_ERROR_INVALID_CLASS;
312 }
313 return JvmtiExport::add_module_uses(h_module, h_service, THREAD);
314 } /* end AddModuleUses */
315
316
317 // module - pre-checked for NULL
318 // service - pre-checked for NULL
319 // impl_class - pre-checked for NULL
320 jvmtiError
321 JvmtiEnv::AddModuleProvides(jobject module, jclass service, jclass impl_class) {
322 JavaThread* THREAD = JavaThread::current();
323
324 // check module
325 Handle h_module(THREAD, JNIHandles::resolve(module));
326 if (!java_lang_Module::is_instance(h_module())) {
327 return JVMTI_ERROR_INVALID_MODULE;
328 }
329 // check service
330 Handle h_service(THREAD, JNIHandles::resolve_external_guard(service));
331 if (!java_lang_Class::is_instance(h_service()) ||
332 java_lang_Class::is_primitive(h_service())) {
333 return JVMTI_ERROR_INVALID_CLASS;
334 }
335 // check impl_class
336 Handle h_impl_class(THREAD, JNIHandles::resolve_external_guard(impl_class));
337 if (!java_lang_Class::is_instance(h_impl_class()) ||
338 java_lang_Class::is_primitive(h_impl_class())) {
339 return JVMTI_ERROR_INVALID_CLASS;
340 }
341 return JvmtiExport::add_module_provides(h_module, h_service, h_impl_class, THREAD);
342 } /* end AddModuleProvides */
343
344 // module - pre-checked for NULL
345 // is_modifiable_class_ptr - pre-checked for NULL
346 jvmtiError
347 JvmtiEnv::IsModifiableModule(jobject module, jboolean* is_modifiable_module_ptr) {
348 JavaThread* THREAD = JavaThread::current();
349
350 // check module
351 Handle h_module(THREAD, JNIHandles::resolve(module));
352 if (!java_lang_Module::is_instance(h_module())) {
353 return JVMTI_ERROR_INVALID_MODULE;
354 }
355
356 *is_modifiable_module_ptr = JNI_TRUE;
357 return JVMTI_ERROR_NONE;
358 } /* end IsModifiableModule */
359
360
361 //
362 // Class functions
363 //
364
365 // class_count_ptr - pre-checked for NULL
366 // classes_ptr - pre-checked for NULL
367 jvmtiError
368 JvmtiEnv::GetLoadedClasses(jint* class_count_ptr, jclass** classes_ptr) {
369 return JvmtiGetLoadedClasses::getLoadedClasses(this, class_count_ptr, classes_ptr);
370 } /* end GetLoadedClasses */
371
372
373 // initiating_loader - NULL is a valid value, must be checked
374 // class_count_ptr - pre-checked for NULL
375 // classes_ptr - pre-checked for NULL
376 jvmtiError
377 JvmtiEnv::GetClassLoaderClasses(jobject initiating_loader, jint* class_count_ptr, jclass** classes_ptr) {
378 return JvmtiGetLoadedClasses::getClassLoaderClasses(this, initiating_loader,
379 class_count_ptr, classes_ptr);
380 } /* end GetClassLoaderClasses */
381
382 // k_mirror - may be primitive, this must be checked
383 // is_modifiable_class_ptr - pre-checked for NULL
384 jvmtiError
385 JvmtiEnv::IsModifiableClass(oop k_mirror, jboolean* is_modifiable_class_ptr) {
386 *is_modifiable_class_ptr = VM_RedefineClasses::is_modifiable_class(k_mirror)?
387 JNI_TRUE : JNI_FALSE;
388 return JVMTI_ERROR_NONE;
389 } /* end IsModifiableClass */
390
391 // class_count - pre-checked to be greater than or equal to 0
392 // classes - pre-checked for NULL
393 jvmtiError
394 JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
395 //TODO: add locking
396
397 int index;
398 JavaThread* current_thread = JavaThread::current();
399 ResourceMark rm(current_thread);
400
401 jvmtiClassDefinition* class_definitions =
402 NEW_RESOURCE_ARRAY(jvmtiClassDefinition, class_count);
403 NULL_CHECK(class_definitions, JVMTI_ERROR_OUT_OF_MEMORY);
404
405 for (index = 0; index < class_count; index++) {
406 HandleMark hm(current_thread);
407
408 jclass jcls = classes[index];
409 oop k_mirror = JNIHandles::resolve_external_guard(jcls);
410 if (k_mirror == NULL) {
411 return JVMTI_ERROR_INVALID_CLASS;
412 }
413 if (!k_mirror->is_a(SystemDictionary::Class_klass())) {
414 return JVMTI_ERROR_INVALID_CLASS;
415 }
416
417 if (!VM_RedefineClasses::is_modifiable_class(k_mirror)) {
418 return JVMTI_ERROR_UNMODIFIABLE_CLASS;
419 }
420
421 Klass* klass = java_lang_Class::as_Klass(k_mirror);
422
423 jint status = klass->jvmti_class_status();
424 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
425 return JVMTI_ERROR_INVALID_CLASS;
426 }
427
428 InstanceKlass* ik = InstanceKlass::cast(klass);
429 if (ik->get_cached_class_file_bytes() == NULL) {
430 // Not cached, we need to reconstitute the class file from the
431 // VM representation. We don't attach the reconstituted class
432 // bytes to the InstanceKlass here because they have not been
433 // validated and we're not at a safepoint.
434 JvmtiClassFileReconstituter reconstituter(ik);
435 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
436 return reconstituter.get_error();
437 }
438
439 class_definitions[index].class_byte_count = (jint)reconstituter.class_file_size();
440 class_definitions[index].class_bytes = (unsigned char*)
441 reconstituter.class_file_bytes();
442 } else {
443 // it is cached, get it from the cache
444 class_definitions[index].class_byte_count = ik->get_cached_class_file_len();
445 class_definitions[index].class_bytes = ik->get_cached_class_file_bytes();
446 }
447 class_definitions[index].klass = jcls;
448 }
449 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
450 VMThread::execute(&op);
451 return (op.check_error());
452 } /* end RetransformClasses */
453
454
455 // class_count - pre-checked to be greater than or equal to 0
456 // class_definitions - pre-checked for NULL
457 jvmtiError
458 JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) {
459 //TODO: add locking
460 VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
461 VMThread::execute(&op);
462 return (op.check_error());
463 } /* end RedefineClasses */
464
465
466 //
467 // Object functions
468 //
469
470 // size_ptr - pre-checked for NULL
471 jvmtiError
472 JvmtiEnv::GetObjectSize(jobject object, jlong* size_ptr) {
473 oop mirror = JNIHandles::resolve_external_guard(object);
474 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
475 *size_ptr = (jlong)mirror->size() * wordSize;
476 return JVMTI_ERROR_NONE;
477 } /* end GetObjectSize */
478
479 //
480 // Method functions
481 //
482
483 // prefix - NULL is a valid value, must be checked
484 jvmtiError
485 JvmtiEnv::SetNativeMethodPrefix(const char* prefix) {
486 return prefix == NULL?
487 SetNativeMethodPrefixes(0, NULL) :
488 SetNativeMethodPrefixes(1, (char**)&prefix);
489 } /* end SetNativeMethodPrefix */
490
491
492 // prefix_count - pre-checked to be greater than or equal to 0
493 // prefixes - pre-checked for NULL
494 jvmtiError
495 JvmtiEnv::SetNativeMethodPrefixes(jint prefix_count, char** prefixes) {
496 // Have to grab JVMTI thread state lock to be sure that some thread
497 // isn't accessing the prefixes at the same time we are setting them.
498 // No locks during VM bring-up.
499 if (Threads::number_of_threads() == 0) {
500 return set_native_method_prefixes(prefix_count, prefixes);
501 } else {
502 MutexLocker mu(JvmtiThreadState_lock);
503 return set_native_method_prefixes(prefix_count, prefixes);
504 }
505 } /* end SetNativeMethodPrefixes */
506
507 //
508 // Event Management functions
509 //
510
511 // callbacks - NULL is a valid value, must be checked
512 // size_of_callbacks - pre-checked to be greater than or equal to 0
513 jvmtiError
514 JvmtiEnv::SetEventCallbacks(const jvmtiEventCallbacks* callbacks, jint size_of_callbacks) {
515 JvmtiEventController::set_event_callbacks(this, callbacks, size_of_callbacks);
516 return JVMTI_ERROR_NONE;
517 } /* end SetEventCallbacks */
518
519
520 // event_thread - NULL is a valid value, must be checked
521 jvmtiError
522 JvmtiEnv::SetEventNotificationMode(jvmtiEventMode mode, jvmtiEvent event_type, jthread event_thread, ...) {
523 JavaThread* java_thread = NULL;
524 if (event_thread != NULL) {
525 oop thread_oop = JNIHandles::resolve_external_guard(event_thread);
526 if (thread_oop == NULL) {
527 return JVMTI_ERROR_INVALID_THREAD;
528 }
529 if (!thread_oop->is_a(SystemDictionary::Thread_klass())) {
530 return JVMTI_ERROR_INVALID_THREAD;
531 }
532 java_thread = java_lang_Thread::thread(thread_oop);
533 if (java_thread == NULL) {
534 return JVMTI_ERROR_THREAD_NOT_ALIVE;
535 }
536 }
537
538 // event_type must be valid
539 if (!JvmtiEventController::is_valid_event_type(event_type)) {
540 return JVMTI_ERROR_INVALID_EVENT_TYPE;
541 }
542
543 // global events cannot be controlled at thread level.
544 if (java_thread != NULL && JvmtiEventController::is_global_event(event_type)) {
545 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
546 }
547
548 bool enabled = (mode == JVMTI_ENABLE);
549
550 // assure that needed capabilities are present
551 if (enabled && !JvmtiUtil::has_event_capability(event_type, get_capabilities())) {
552 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
553 }
554
555 if (event_type == JVMTI_EVENT_CLASS_FILE_LOAD_HOOK && enabled) {
556 record_class_file_load_hook_enabled();
557 }
558 JvmtiEventController::set_user_enabled(this, java_thread, event_type, enabled);
559
560 return JVMTI_ERROR_NONE;
561 } /* end SetEventNotificationMode */
562
563 //
564 // Capability functions
565 //
566
567 // capabilities_ptr - pre-checked for NULL
568 jvmtiError
569 JvmtiEnv::GetPotentialCapabilities(jvmtiCapabilities* capabilities_ptr) {
570 JvmtiManageCapabilities::get_potential_capabilities(get_capabilities(),
571 get_prohibited_capabilities(),
572 capabilities_ptr);
573 return JVMTI_ERROR_NONE;
574 } /* end GetPotentialCapabilities */
575
576
577 // capabilities_ptr - pre-checked for NULL
578 jvmtiError
579 JvmtiEnv::AddCapabilities(const jvmtiCapabilities* capabilities_ptr) {
580 return JvmtiManageCapabilities::add_capabilities(get_capabilities(),
581 get_prohibited_capabilities(),
582 capabilities_ptr,
583 get_capabilities());
584 } /* end AddCapabilities */
585
586
587 // capabilities_ptr - pre-checked for NULL
588 jvmtiError
589 JvmtiEnv::RelinquishCapabilities(const jvmtiCapabilities* capabilities_ptr) {
590 JvmtiManageCapabilities::relinquish_capabilities(get_capabilities(), capabilities_ptr, get_capabilities());
591 return JVMTI_ERROR_NONE;
592 } /* end RelinquishCapabilities */
593
594
595 // capabilities_ptr - pre-checked for NULL
596 jvmtiError
597 JvmtiEnv::GetCapabilities(jvmtiCapabilities* capabilities_ptr) {
598 JvmtiManageCapabilities::copy_capabilities(get_capabilities(), capabilities_ptr);
599 return JVMTI_ERROR_NONE;
600 } /* end GetCapabilities */
601
602 //
603 // Class Loader Search functions
604 //
605
606 // segment - pre-checked for NULL
607 jvmtiError
608 JvmtiEnv::AddToBootstrapClassLoaderSearch(const char* segment) {
609 jvmtiPhase phase = get_phase();
610 if (phase == JVMTI_PHASE_ONLOAD) {
611 Arguments::append_sysclasspath(segment);
612 return JVMTI_ERROR_NONE;
613 } else if (use_version_1_0_semantics()) {
614 // This JvmtiEnv requested version 1.0 semantics and this function
615 // is only allowed in the ONLOAD phase in version 1.0 so we need to
616 // return an error here.
617 return JVMTI_ERROR_WRONG_PHASE;
618 } else if (phase == JVMTI_PHASE_LIVE) {
619 // The phase is checked by the wrapper that called this function,
620 // but this thread could be racing with the thread that is
621 // terminating the VM so we check one more time.
622
623 // create the zip entry
624 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, true);
625 if (zip_entry == NULL) {
626 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
627 }
628
629 // lock the loader
630 Thread* thread = Thread::current();
631 HandleMark hm;
632 Handle loader_lock = Handle(thread, SystemDictionary::system_loader_lock());
633
634 ObjectLocker ol(loader_lock, thread);
635
636 // add the jar file to the bootclasspath
637 log_info(class, load)("opened: %s", zip_entry->name());
638 ClassLoaderExt::append_boot_classpath(zip_entry);
639 return JVMTI_ERROR_NONE;
640 } else {
641 return JVMTI_ERROR_WRONG_PHASE;
642 }
643
644 } /* end AddToBootstrapClassLoaderSearch */
645
646
647 // segment - pre-checked for NULL
648 jvmtiError
649 JvmtiEnv::AddToSystemClassLoaderSearch(const char* segment) {
650 jvmtiPhase phase = get_phase();
651
652 if (phase == JVMTI_PHASE_ONLOAD) {
653 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
654 if (strcmp("java.class.path", p->key()) == 0) {
655 p->append_value(segment);
656 break;
657 }
658 }
659 return JVMTI_ERROR_NONE;
660 } else if (phase == JVMTI_PHASE_LIVE) {
661 // The phase is checked by the wrapper that called this function,
662 // but this thread could be racing with the thread that is
663 // terminating the VM so we check one more time.
664 HandleMark hm;
665
666 // create the zip entry (which will open the zip file and hence
667 // check that the segment is indeed a zip file).
668 ClassPathZipEntry* zip_entry = ClassLoader::create_class_path_zip_entry(segment, false);
669 if (zip_entry == NULL) {
670 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
671 }
672 delete zip_entry; // no longer needed
673
674 // lock the loader
675 Thread* THREAD = Thread::current();
676 Handle loader = Handle(THREAD, SystemDictionary::java_system_loader());
677
678 ObjectLocker ol(loader, THREAD);
679
680 // need the path as java.lang.String
681 Handle path = java_lang_String::create_from_platform_dependent_str(segment, THREAD);
682 if (HAS_PENDING_EXCEPTION) {
683 CLEAR_PENDING_EXCEPTION;
684 return JVMTI_ERROR_INTERNAL;
685 }
686
687 // Invoke the appendToClassPathForInstrumentation method - if the method
688 // is not found it means the loader doesn't support adding to the class path
689 // in the live phase.
690 {
691 JavaValue res(T_VOID);
692 JavaCalls::call_special(&res,
693 loader,
694 loader->klass(),
695 vmSymbols::appendToClassPathForInstrumentation_name(),
696 vmSymbols::appendToClassPathForInstrumentation_signature(),
697 path,
698 THREAD);
699 if (HAS_PENDING_EXCEPTION) {
700 Symbol* ex_name = PENDING_EXCEPTION->klass()->name();
701 CLEAR_PENDING_EXCEPTION;
702
703 if (ex_name == vmSymbols::java_lang_NoSuchMethodError()) {
704 return JVMTI_ERROR_CLASS_LOADER_UNSUPPORTED;
705 } else {
706 return JVMTI_ERROR_INTERNAL;
707 }
708 }
709 }
710
711 return JVMTI_ERROR_NONE;
712 } else {
713 return JVMTI_ERROR_WRONG_PHASE;
714 }
715 } /* end AddToSystemClassLoaderSearch */
716
717 //
718 // General functions
719 //
720
721 // phase_ptr - pre-checked for NULL
722 jvmtiError
723 JvmtiEnv::GetPhase(jvmtiPhase* phase_ptr) {
724 *phase_ptr = phase();
725 return JVMTI_ERROR_NONE;
726 } /* end GetPhase */
727
728
729 jvmtiError
730 JvmtiEnv::DisposeEnvironment() {
731 dispose();
732 return JVMTI_ERROR_NONE;
733 } /* end DisposeEnvironment */
734
735
736 // data - NULL is a valid value, must be checked
737 jvmtiError
738 JvmtiEnv::SetEnvironmentLocalStorage(const void* data) {
739 set_env_local_storage(data);
740 return JVMTI_ERROR_NONE;
741 } /* end SetEnvironmentLocalStorage */
742
743
744 // data_ptr - pre-checked for NULL
745 jvmtiError
746 JvmtiEnv::GetEnvironmentLocalStorage(void** data_ptr) {
747 *data_ptr = (void*)get_env_local_storage();
748 return JVMTI_ERROR_NONE;
749 } /* end GetEnvironmentLocalStorage */
750
751 // version_ptr - pre-checked for NULL
752 jvmtiError
753 JvmtiEnv::GetVersionNumber(jint* version_ptr) {
754 *version_ptr = JVMTI_VERSION;
755 return JVMTI_ERROR_NONE;
756 } /* end GetVersionNumber */
757
758
759 // name_ptr - pre-checked for NULL
760 jvmtiError
761 JvmtiEnv::GetErrorName(jvmtiError error, char** name_ptr) {
762 if (error < JVMTI_ERROR_NONE || error > JVMTI_ERROR_MAX) {
763 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
764 }
765 const char *name = JvmtiUtil::error_name(error);
766 if (name == NULL) {
767 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
768 }
769 size_t len = strlen(name) + 1;
770 jvmtiError err = allocate(len, (unsigned char**)name_ptr);
771 if (err == JVMTI_ERROR_NONE) {
772 memcpy(*name_ptr, name, len);
773 }
774 return err;
775 } /* end GetErrorName */
776
777
778 jvmtiError
779 JvmtiEnv::SetVerboseFlag(jvmtiVerboseFlag flag, jboolean value) {
780 LogLevelType level = value == 0 ? LogLevel::Off : LogLevel::Info;
781 switch (flag) {
782 case JVMTI_VERBOSE_OTHER:
783 // ignore
784 break;
785 case JVMTI_VERBOSE_CLASS:
786 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, unload));
787 LogConfiguration::configure_stdout(level, false, LOG_TAGS(class, load));
788 break;
789 case JVMTI_VERBOSE_GC:
790 if (value == 0) {
791 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(gc));
792 } else {
793 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc));
794 }
795 break;
796 case JVMTI_VERBOSE_JNI:
797 PrintJNIResolving = value != 0;
798 break;
799 default:
800 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
801 };
802 return JVMTI_ERROR_NONE;
803 } /* end SetVerboseFlag */
804
805
806 // format_ptr - pre-checked for NULL
807 jvmtiError
808 JvmtiEnv::GetJLocationFormat(jvmtiJlocationFormat* format_ptr) {
809 *format_ptr = JVMTI_JLOCATION_JVMBCI;
810 return JVMTI_ERROR_NONE;
811 } /* end GetJLocationFormat */
812
813 //
814 // Thread functions
815 //
816
817 // Threads_lock NOT held
818 // thread - NOT pre-checked
819 // thread_state_ptr - pre-checked for NULL
820 jvmtiError
821 JvmtiEnv::GetThreadState(jthread thread, jint* thread_state_ptr) {
822 jint state;
823 oop thread_oop;
824 JavaThread* thr;
825
826 if (thread == NULL) {
827 thread_oop = JavaThread::current()->threadObj();
828 } else {
829 thread_oop = JNIHandles::resolve_external_guard(thread);
830 }
831
832 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) {
833 return JVMTI_ERROR_INVALID_THREAD;
834 }
835
836 // get most state bits
837 state = (jint)java_lang_Thread::get_thread_status(thread_oop);
838
839 // add more state bits
840 thr = java_lang_Thread::thread(thread_oop);
841 if (thr != NULL) {
842 JavaThreadState jts = thr->thread_state();
843
844 if (thr->is_being_ext_suspended()) {
845 state |= JVMTI_THREAD_STATE_SUSPENDED;
846 }
847 if (jts == _thread_in_native) {
848 state |= JVMTI_THREAD_STATE_IN_NATIVE;
849 }
850 OSThread* osThread = thr->osthread();
851 if (osThread != NULL && osThread->interrupted()) {
852 state |= JVMTI_THREAD_STATE_INTERRUPTED;
853 }
854 }
855
856 *thread_state_ptr = state;
857 return JVMTI_ERROR_NONE;
858 } /* end GetThreadState */
859
860
861 // thread_ptr - pre-checked for NULL
862 jvmtiError
863 JvmtiEnv::GetCurrentThread(jthread* thread_ptr) {
864 JavaThread* current_thread = JavaThread::current();
865 *thread_ptr = (jthread)JNIHandles::make_local(current_thread, current_thread->threadObj());
866 return JVMTI_ERROR_NONE;
867 } /* end GetCurrentThread */
868
869
870 // threads_count_ptr - pre-checked for NULL
871 // threads_ptr - pre-checked for NULL
872 jvmtiError
873 JvmtiEnv::GetAllThreads(jint* threads_count_ptr, jthread** threads_ptr) {
874 int nthreads = 0;
875 Handle *thread_objs = NULL;
876 ResourceMark rm;
877 HandleMark hm;
878
879 // enumerate threads (including agent threads)
880 ThreadsListEnumerator tle(Thread::current(), true);
881 nthreads = tle.num_threads();
882 *threads_count_ptr = nthreads;
883
884 if (nthreads == 0) {
885 *threads_ptr = NULL;
886 return JVMTI_ERROR_NONE;
887 }
888
889 thread_objs = NEW_RESOURCE_ARRAY(Handle, nthreads);
890 NULL_CHECK(thread_objs, JVMTI_ERROR_OUT_OF_MEMORY);
891
892 for (int i=0; i < nthreads; i++) {
893 thread_objs[i] = Handle(tle.get_threadObj(i));
894 }
895
896 // have to make global handles outside of Threads_lock
897 jthread *jthreads = new_jthreadArray(nthreads, thread_objs);
898 NULL_CHECK(jthreads, JVMTI_ERROR_OUT_OF_MEMORY);
899
900 *threads_ptr = jthreads;
901 return JVMTI_ERROR_NONE;
902 } /* end GetAllThreads */
903
904
905 // Threads_lock NOT held, java_thread not protected by lock
906 // java_thread - pre-checked
907 jvmtiError
908 JvmtiEnv::SuspendThread(JavaThread* java_thread) {
909 // don't allow hidden thread suspend request.
910 if (java_thread->is_hidden_from_external_view()) {
911 return (JVMTI_ERROR_NONE);
912 }
913
914 {
915 MutexLockerEx ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag);
916 if (java_thread->is_external_suspend()) {
917 // don't allow nested external suspend requests.
918 return (JVMTI_ERROR_THREAD_SUSPENDED);
919 }
920 if (java_thread->is_exiting()) { // thread is in the process of exiting
921 return (JVMTI_ERROR_THREAD_NOT_ALIVE);
922 }
923 java_thread->set_external_suspend();
924 }
925
926 if (!JvmtiSuspendControl::suspend(java_thread)) {
927 // the thread was in the process of exiting
928 return (JVMTI_ERROR_THREAD_NOT_ALIVE);
929 }
930 return JVMTI_ERROR_NONE;
931 } /* end SuspendThread */
932
933
934 // request_count - pre-checked to be greater than or equal to 0
935 // request_list - pre-checked for NULL
936 // results - pre-checked for NULL
937 jvmtiError
938 JvmtiEnv::SuspendThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
939 int needSafepoint = 0; // > 0 if we need a safepoint
940 for (int i = 0; i < request_count; i++) {
941 JavaThread *java_thread = get_JavaThread(request_list[i]);
942 if (java_thread == NULL) {
943 results[i] = JVMTI_ERROR_INVALID_THREAD;
944 continue;
945 }
946 // the thread has not yet run or has exited (not on threads list)
947 if (java_thread->threadObj() == NULL) {
948 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
949 continue;
950 }
951 if (java_lang_Thread::thread(java_thread->threadObj()) == NULL) {
952 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
953 continue;
954 }
955 // don't allow hidden thread suspend request.
956 if (java_thread->is_hidden_from_external_view()) {
957 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend
958 continue;
959 }
960
961 {
962 MutexLockerEx ml(java_thread->SR_lock(), Mutex::_no_safepoint_check_flag);
963 if (java_thread->is_external_suspend()) {
964 // don't allow nested external suspend requests.
965 results[i] = JVMTI_ERROR_THREAD_SUSPENDED;
966 continue;
967 }
968 if (java_thread->is_exiting()) { // thread is in the process of exiting
969 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
970 continue;
971 }
972 java_thread->set_external_suspend();
973 }
974 if (java_thread->thread_state() == _thread_in_native) {
975 // We need to try and suspend native threads here. Threads in
976 // other states will self-suspend on their next transition.
977 if (!JvmtiSuspendControl::suspend(java_thread)) {
978 // The thread was in the process of exiting. Force another
979 // safepoint to make sure that this thread transitions.
980 needSafepoint++;
981 results[i] = JVMTI_ERROR_THREAD_NOT_ALIVE;
982 continue;
983 }
984 } else {
985 needSafepoint++;
986 }
987 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend
988 }
989 if (needSafepoint > 0) {
990 VM_ThreadsSuspendJVMTI tsj;
991 VMThread::execute(&tsj);
992 }
993 // per-thread suspend results returned via results parameter
994 return JVMTI_ERROR_NONE;
995 } /* end SuspendThreadList */
996
997
998 // Threads_lock NOT held, java_thread not protected by lock
999 // java_thread - pre-checked
1000 jvmtiError
1001 JvmtiEnv::ResumeThread(JavaThread* java_thread) {
1002 // don't allow hidden thread resume request.
1003 if (java_thread->is_hidden_from_external_view()) {
1004 return JVMTI_ERROR_NONE;
1005 }
1006
1007 if (!java_thread->is_being_ext_suspended()) {
1008 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1009 }
1010
1011 if (!JvmtiSuspendControl::resume(java_thread)) {
1012 return JVMTI_ERROR_INTERNAL;
1013 }
1014 return JVMTI_ERROR_NONE;
1015 } /* end ResumeThread */
1016
1017
1018 // request_count - pre-checked to be greater than or equal to 0
1019 // request_list - pre-checked for NULL
1020 // results - pre-checked for NULL
1021 jvmtiError
1022 JvmtiEnv::ResumeThreadList(jint request_count, const jthread* request_list, jvmtiError* results) {
1023 for (int i = 0; i < request_count; i++) {
1024 JavaThread *java_thread = get_JavaThread(request_list[i]);
1025 if (java_thread == NULL) {
1026 results[i] = JVMTI_ERROR_INVALID_THREAD;
1027 continue;
1028 }
1029 // don't allow hidden thread resume request.
1030 if (java_thread->is_hidden_from_external_view()) {
1031 results[i] = JVMTI_ERROR_NONE; // indicate successful resume
1032 continue;
1033 }
1034 if (!java_thread->is_being_ext_suspended()) {
1035 results[i] = JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1036 continue;
1037 }
1038
1039 if (!JvmtiSuspendControl::resume(java_thread)) {
1040 results[i] = JVMTI_ERROR_INTERNAL;
1041 continue;
1042 }
1043
1044 results[i] = JVMTI_ERROR_NONE; // indicate successful suspend
1045 }
1046 // per-thread resume results returned via results parameter
1047 return JVMTI_ERROR_NONE;
1048 } /* end ResumeThreadList */
1049
1050
1051 // Threads_lock NOT held, java_thread not protected by lock
1052 // java_thread - pre-checked
1053 jvmtiError
1054 JvmtiEnv::StopThread(JavaThread* java_thread, jobject exception) {
1055 oop e = JNIHandles::resolve_external_guard(exception);
1056 NULL_CHECK(e, JVMTI_ERROR_NULL_POINTER);
1057
1058 JavaThread::send_async_exception(java_thread->threadObj(), e);
1059
1060 return JVMTI_ERROR_NONE;
1061
1062 } /* end StopThread */
1063
1064
1065 // Threads_lock NOT held
1066 // thread - NOT pre-checked
1067 jvmtiError
1068 JvmtiEnv::InterruptThread(jthread thread) {
1069 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1070 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass()))
1071 return JVMTI_ERROR_INVALID_THREAD;
1072
1073 JavaThread* current_thread = JavaThread::current();
1074
1075 // Todo: this is a duplicate of JVM_Interrupt; share code in future
1076 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
1077 MutexLockerEx ml(current_thread->threadObj() == thread_oop ? NULL : Threads_lock);
1078 // We need to re-resolve the java_thread, since a GC might have happened during the
1079 // acquire of the lock
1080
1081 JavaThread* java_thread = java_lang_Thread::thread(JNIHandles::resolve_external_guard(thread));
1082 NULL_CHECK(java_thread, JVMTI_ERROR_THREAD_NOT_ALIVE);
1083
1084 Thread::interrupt(java_thread);
1085
1086 return JVMTI_ERROR_NONE;
1087 } /* end InterruptThread */
1088
1089
1090 // Threads_lock NOT held
1091 // thread - NOT pre-checked
1092 // info_ptr - pre-checked for NULL
1093 jvmtiError
1094 JvmtiEnv::GetThreadInfo(jthread thread, jvmtiThreadInfo* info_ptr) {
1095 ResourceMark rm;
1096 HandleMark hm;
1097
1098 JavaThread* current_thread = JavaThread::current();
1099
1100 // if thread is NULL the current thread is used
1101 oop thread_oop;
1102 if (thread == NULL) {
1103 thread_oop = current_thread->threadObj();
1104 } else {
1105 thread_oop = JNIHandles::resolve_external_guard(thread);
1106 }
1107 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass()))
1108 return JVMTI_ERROR_INVALID_THREAD;
1109
1110 Handle thread_obj(current_thread, thread_oop);
1111 Handle name;
1112 ThreadPriority priority;
1113 Handle thread_group;
1114 Handle context_class_loader;
1115 bool is_daemon;
1116
1117 { MutexLocker mu(Threads_lock);
1118
1119 name = Handle(current_thread, java_lang_Thread::name(thread_obj()));
1120 priority = java_lang_Thread::priority(thread_obj());
1121 thread_group = Handle(current_thread, java_lang_Thread::threadGroup(thread_obj()));
1122 is_daemon = java_lang_Thread::is_daemon(thread_obj());
1123
1124 oop loader = java_lang_Thread::context_class_loader(thread_obj());
1125 context_class_loader = Handle(current_thread, loader);
1126 }
1127 { const char *n;
1128
1129 if (name() != NULL) {
1130 n = java_lang_String::as_utf8_string(name());
1131 } else {
1132 int utf8_length = 0;
1133 n = UNICODE::as_utf8((jchar*) NULL, utf8_length);
1134 }
1135
1136 info_ptr->name = (char *) jvmtiMalloc(strlen(n)+1);
1137 if (info_ptr->name == NULL)
1138 return JVMTI_ERROR_OUT_OF_MEMORY;
1139
1140 strcpy(info_ptr->name, n);
1141 }
1142 info_ptr->is_daemon = is_daemon;
1143 info_ptr->priority = priority;
1144
1145 info_ptr->context_class_loader = (context_class_loader.is_null()) ? NULL :
1146 jni_reference(context_class_loader);
1147 info_ptr->thread_group = jni_reference(thread_group);
1148
1149 return JVMTI_ERROR_NONE;
1150 } /* end GetThreadInfo */
1151
1152
1153 // Threads_lock NOT held, java_thread not protected by lock
1154 // java_thread - pre-checked
1155 // owned_monitor_count_ptr - pre-checked for NULL
1156 // owned_monitors_ptr - pre-checked for NULL
1157 jvmtiError
1158 JvmtiEnv::GetOwnedMonitorInfo(JavaThread* java_thread, jint* owned_monitor_count_ptr, jobject** owned_monitors_ptr) {
1159 jvmtiError err = JVMTI_ERROR_NONE;
1160 JavaThread* calling_thread = JavaThread::current();
1161
1162 // growable array of jvmti monitors info on the C-heap
1163 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1164 new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true);
1165
1166 // It is only safe to perform the direct operation on the current
1167 // thread. All other usage needs to use a vm-safepoint-op for safety.
1168 if (java_thread == calling_thread) {
1169 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1170 } else {
1171 // JVMTI get monitors info at safepoint. Do not require target thread to
1172 // be suspended.
1173 VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list);
1174 VMThread::execute(&op);
1175 err = op.result();
1176 }
1177 jint owned_monitor_count = owned_monitors_list->length();
1178 if (err == JVMTI_ERROR_NONE) {
1179 if ((err = allocate(owned_monitor_count * sizeof(jobject *),
1180 (unsigned char**)owned_monitors_ptr)) == JVMTI_ERROR_NONE) {
1181 // copy into the returned array
1182 for (int i = 0; i < owned_monitor_count; i++) {
1183 (*owned_monitors_ptr)[i] =
1184 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1185 }
1186 *owned_monitor_count_ptr = owned_monitor_count;
1187 }
1188 }
1189 // clean up.
1190 for (int i = 0; i < owned_monitor_count; i++) {
1191 deallocate((unsigned char*)owned_monitors_list->at(i));
1192 }
1193 delete owned_monitors_list;
1194
1195 return err;
1196 } /* end GetOwnedMonitorInfo */
1197
1198
1199 // Threads_lock NOT held, java_thread not protected by lock
1200 // java_thread - pre-checked
1201 // monitor_info_count_ptr - pre-checked for NULL
1202 // monitor_info_ptr - pre-checked for NULL
1203 jvmtiError
1204 JvmtiEnv::GetOwnedMonitorStackDepthInfo(JavaThread* java_thread, jint* monitor_info_count_ptr, jvmtiMonitorStackDepthInfo** monitor_info_ptr) {
1205 jvmtiError err = JVMTI_ERROR_NONE;
1206 JavaThread* calling_thread = JavaThread::current();
1207
1208 // growable array of jvmti monitors info on the C-heap
1209 GrowableArray<jvmtiMonitorStackDepthInfo*> *owned_monitors_list =
1210 new (ResourceObj::C_HEAP, mtInternal) GrowableArray<jvmtiMonitorStackDepthInfo*>(1, true);
1211
1212 // It is only safe to perform the direct operation on the current
1213 // thread. All other usage needs to use a vm-safepoint-op for safety.
1214 if (java_thread == calling_thread) {
1215 err = get_owned_monitors(calling_thread, java_thread, owned_monitors_list);
1216 } else {
1217 // JVMTI get owned monitors info at safepoint. Do not require target thread to
1218 // be suspended.
1219 VM_GetOwnedMonitorInfo op(this, calling_thread, java_thread, owned_monitors_list);
1220 VMThread::execute(&op);
1221 err = op.result();
1222 }
1223
1224 jint owned_monitor_count = owned_monitors_list->length();
1225 if (err == JVMTI_ERROR_NONE) {
1226 if ((err = allocate(owned_monitor_count * sizeof(jvmtiMonitorStackDepthInfo),
1227 (unsigned char**)monitor_info_ptr)) == JVMTI_ERROR_NONE) {
1228 // copy to output array.
1229 for (int i = 0; i < owned_monitor_count; i++) {
1230 (*monitor_info_ptr)[i].monitor =
1231 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->monitor;
1232 (*monitor_info_ptr)[i].stack_depth =
1233 ((jvmtiMonitorStackDepthInfo*)owned_monitors_list->at(i))->stack_depth;
1234 }
1235 }
1236 *monitor_info_count_ptr = owned_monitor_count;
1237 }
1238
1239 // clean up.
1240 for (int i = 0; i < owned_monitor_count; i++) {
1241 deallocate((unsigned char*)owned_monitors_list->at(i));
1242 }
1243 delete owned_monitors_list;
1244
1245 return err;
1246 } /* end GetOwnedMonitorStackDepthInfo */
1247
1248
1249 // Threads_lock NOT held, java_thread not protected by lock
1250 // java_thread - pre-checked
1251 // monitor_ptr - pre-checked for NULL
1252 jvmtiError
1253 JvmtiEnv::GetCurrentContendedMonitor(JavaThread* java_thread, jobject* monitor_ptr) {
1254 jvmtiError err = JVMTI_ERROR_NONE;
1255 JavaThread* calling_thread = JavaThread::current();
1256
1257 // It is only safe to perform the direct operation on the current
1258 // thread. All other usage needs to use a vm-safepoint-op for safety.
1259 if (java_thread == calling_thread) {
1260 err = get_current_contended_monitor(calling_thread, java_thread, monitor_ptr);
1261 } else {
1262 // get contended monitor information at safepoint.
1263 VM_GetCurrentContendedMonitor op(this, calling_thread, java_thread, monitor_ptr);
1264 VMThread::execute(&op);
1265 err = op.result();
1266 }
1267 return err;
1268 } /* end GetCurrentContendedMonitor */
1269
1270
1271 // Threads_lock NOT held
1272 // thread - NOT pre-checked
1273 // proc - pre-checked for NULL
1274 // arg - NULL is a valid value, must be checked
1275 jvmtiError
1276 JvmtiEnv::RunAgentThread(jthread thread, jvmtiStartFunction proc, const void* arg, jint priority) {
1277 oop thread_oop = JNIHandles::resolve_external_guard(thread);
1278 if (thread_oop == NULL || !thread_oop->is_a(SystemDictionary::Thread_klass())) {
1279 return JVMTI_ERROR_INVALID_THREAD;
1280 }
1281 if (priority < JVMTI_THREAD_MIN_PRIORITY || priority > JVMTI_THREAD_MAX_PRIORITY) {
1282 return JVMTI_ERROR_INVALID_PRIORITY;
1283 }
1284
1285 //Thread-self
1286 JavaThread* current_thread = JavaThread::current();
1287
1288 Handle thread_hndl(current_thread, thread_oop);
1289 {
1290 MutexLocker mu(Threads_lock); // grab Threads_lock
1291
1292 JvmtiAgentThread *new_thread = new JvmtiAgentThread(this, proc, arg);
1293
1294 // At this point it may be possible that no osthread was created for the
1295 // JavaThread due to lack of memory.
1296 if (new_thread == NULL || new_thread->osthread() == NULL) {
1297 if (new_thread) delete new_thread;
1298 return JVMTI_ERROR_OUT_OF_MEMORY;
1299 }
1300
1301 java_lang_Thread::set_thread(thread_hndl(), new_thread);
1302 java_lang_Thread::set_priority(thread_hndl(), (ThreadPriority)priority);
1303 java_lang_Thread::set_daemon(thread_hndl());
1304
1305 new_thread->set_threadObj(thread_hndl());
1306 Threads::add(new_thread);
1307 Thread::start(new_thread);
1308 } // unlock Threads_lock
1309
1310 return JVMTI_ERROR_NONE;
1311 } /* end RunAgentThread */
1312
1313 //
1314 // Thread Group functions
1315 //
1316
1317 // group_count_ptr - pre-checked for NULL
1318 // groups_ptr - pre-checked for NULL
1319 jvmtiError
1320 JvmtiEnv::GetTopThreadGroups(jint* group_count_ptr, jthreadGroup** groups_ptr) {
1321 JavaThread* current_thread = JavaThread::current();
1322
1323 // Only one top level thread group now.
1324 *group_count_ptr = 1;
1325
1326 // Allocate memory to store global-refs to the thread groups.
1327 // Assume this area is freed by caller.
1328 *groups_ptr = (jthreadGroup *) jvmtiMalloc((sizeof(jthreadGroup)) * (*group_count_ptr));
1329
1330 NULL_CHECK(*groups_ptr, JVMTI_ERROR_OUT_OF_MEMORY);
1331
1332 // Convert oop to Handle, then convert Handle to global-ref.
1333 {
1334 HandleMark hm(current_thread);
1335 Handle system_thread_group(current_thread, Universe::system_thread_group());
1336 *groups_ptr[0] = jni_reference(system_thread_group);
1337 }
1338
1339 return JVMTI_ERROR_NONE;
1340 } /* end GetTopThreadGroups */
1341
1342
1343 // info_ptr - pre-checked for NULL
1344 jvmtiError
1345 JvmtiEnv::GetThreadGroupInfo(jthreadGroup group, jvmtiThreadGroupInfo* info_ptr) {
1346 ResourceMark rm;
1347 HandleMark hm;
1348
1349 JavaThread* current_thread = JavaThread::current();
1350
1351 Handle group_obj (current_thread, JNIHandles::resolve_external_guard(group));
1352 NULL_CHECK(group_obj(), JVMTI_ERROR_INVALID_THREAD_GROUP);
1353
1354 const char* name;
1355 Handle parent_group;
1356 bool is_daemon;
1357 ThreadPriority max_priority;
1358
1359 { MutexLocker mu(Threads_lock);
1360
1361 name = java_lang_ThreadGroup::name(group_obj());
1362 parent_group = Handle(current_thread, java_lang_ThreadGroup::parent(group_obj()));
1363 is_daemon = java_lang_ThreadGroup::is_daemon(group_obj());
1364 max_priority = java_lang_ThreadGroup::maxPriority(group_obj());
1365 }
1366
1367 info_ptr->is_daemon = is_daemon;
1368 info_ptr->max_priority = max_priority;
1369 info_ptr->parent = jni_reference(parent_group);
1370
1371 if (name != NULL) {
1372 info_ptr->name = (char*)jvmtiMalloc(strlen(name)+1);
1373 NULL_CHECK(info_ptr->name, JVMTI_ERROR_OUT_OF_MEMORY);
1374 strcpy(info_ptr->name, name);
1375 } else {
1376 info_ptr->name = NULL;
1377 }
1378
1379 return JVMTI_ERROR_NONE;
1380 } /* end GetThreadGroupInfo */
1381
1382
1383 // thread_count_ptr - pre-checked for NULL
1384 // threads_ptr - pre-checked for NULL
1385 // group_count_ptr - pre-checked for NULL
1386 // groups_ptr - pre-checked for NULL
1387 jvmtiError
1388 JvmtiEnv::GetThreadGroupChildren(jthreadGroup group, jint* thread_count_ptr, jthread** threads_ptr, jint* group_count_ptr, jthreadGroup** groups_ptr) {
1389 JavaThread* current_thread = JavaThread::current();
1390 oop group_obj = (oop) JNIHandles::resolve_external_guard(group);
1391 NULL_CHECK(group_obj, JVMTI_ERROR_INVALID_THREAD_GROUP);
1392
1393 Handle *thread_objs = NULL;
1394 Handle *group_objs = NULL;
1395 int nthreads = 0;
1396 int ngroups = 0;
1397 int hidden_threads = 0;
1398
1399 ResourceMark rm;
1400 HandleMark hm;
1401
1402 Handle group_hdl(current_thread, group_obj);
1403
1404 { MutexLocker mu(Threads_lock);
1405
1406 nthreads = java_lang_ThreadGroup::nthreads(group_hdl());
1407 ngroups = java_lang_ThreadGroup::ngroups(group_hdl());
1408
1409 if (nthreads > 0) {
1410 objArrayOop threads = java_lang_ThreadGroup::threads(group_hdl());
1411 assert(nthreads <= threads->length(), "too many threads");
1412 thread_objs = NEW_RESOURCE_ARRAY(Handle,nthreads);
1413 for (int i=0, j=0; i<nthreads; i++) {
1414 oop thread_obj = threads->obj_at(i);
1415 assert(thread_obj != NULL, "thread_obj is NULL");
1416 JavaThread *javathread = java_lang_Thread::thread(thread_obj);
1417 // Filter out hidden java threads.
1418 if (javathread != NULL && javathread->is_hidden_from_external_view()) {
1419 hidden_threads++;
1420 continue;
1421 }
1422 thread_objs[j++] = Handle(current_thread, thread_obj);
1423 }
1424 nthreads -= hidden_threads;
1425 }
1426 if (ngroups > 0) {
1427 objArrayOop groups = java_lang_ThreadGroup::groups(group_hdl());
1428 assert(ngroups <= groups->length(), "too many threads");
1429 group_objs = NEW_RESOURCE_ARRAY(Handle,ngroups);
1430 for (int i=0; i<ngroups; i++) {
1431 oop group_obj = groups->obj_at(i);
1432 assert(group_obj != NULL, "group_obj != NULL");
1433 group_objs[i] = Handle(current_thread, group_obj);
1434 }
1435 }
1436 }
1437
1438 // have to make global handles outside of Threads_lock
1439 *group_count_ptr = ngroups;
1440 *thread_count_ptr = nthreads;
1441 *threads_ptr = new_jthreadArray(nthreads, thread_objs);
1442 *groups_ptr = new_jthreadGroupArray(ngroups, group_objs);
1443 if ((nthreads > 0) && (*threads_ptr == NULL)) {
1444 return JVMTI_ERROR_OUT_OF_MEMORY;
1445 }
1446 if ((ngroups > 0) && (*groups_ptr == NULL)) {
1447 return JVMTI_ERROR_OUT_OF_MEMORY;
1448 }
1449
1450 return JVMTI_ERROR_NONE;
1451 } /* end GetThreadGroupChildren */
1452
1453
1454 //
1455 // Stack Frame functions
1456 //
1457
1458 // Threads_lock NOT held, java_thread not protected by lock
1459 // java_thread - pre-checked
1460 // max_frame_count - pre-checked to be greater than or equal to 0
1461 // frame_buffer - pre-checked for NULL
1462 // count_ptr - pre-checked for NULL
1463 jvmtiError
1464 JvmtiEnv::GetStackTrace(JavaThread* java_thread, jint start_depth, jint max_frame_count, jvmtiFrameInfo* frame_buffer, jint* count_ptr) {
1465 jvmtiError err = JVMTI_ERROR_NONE;
1466
1467 // It is only safe to perform the direct operation on the current
1468 // thread. All other usage needs to use a vm-safepoint-op for safety.
1469 if (java_thread == JavaThread::current()) {
1470 err = get_stack_trace(java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1471 } else {
1472 // JVMTI get stack trace at safepoint. Do not require target thread to
1473 // be suspended.
1474 VM_GetStackTrace op(this, java_thread, start_depth, max_frame_count, frame_buffer, count_ptr);
1475 VMThread::execute(&op);
1476 err = op.result();
1477 }
1478
1479 return err;
1480 } /* end GetStackTrace */
1481
1482
1483 // max_frame_count - pre-checked to be greater than or equal to 0
1484 // stack_info_ptr - pre-checked for NULL
1485 // thread_count_ptr - pre-checked for NULL
1486 jvmtiError
1487 JvmtiEnv::GetAllStackTraces(jint max_frame_count, jvmtiStackInfo** stack_info_ptr, jint* thread_count_ptr) {
1488 jvmtiError err = JVMTI_ERROR_NONE;
1489 JavaThread* calling_thread = JavaThread::current();
1490
1491 // JVMTI get stack traces at safepoint.
1492 VM_GetAllStackTraces op(this, calling_thread, max_frame_count);
1493 VMThread::execute(&op);
1494 *thread_count_ptr = op.final_thread_count();
1495 *stack_info_ptr = op.stack_info();
1496 err = op.result();
1497 return err;
1498 } /* end GetAllStackTraces */
1499
1500
1501 // thread_count - pre-checked to be greater than or equal to 0
1502 // thread_list - pre-checked for NULL
1503 // max_frame_count - pre-checked to be greater than or equal to 0
1504 // stack_info_ptr - pre-checked for NULL
1505 jvmtiError
1506 JvmtiEnv::GetThreadListStackTraces(jint thread_count, const jthread* thread_list, jint max_frame_count, jvmtiStackInfo** stack_info_ptr) {
1507 jvmtiError err = JVMTI_ERROR_NONE;
1508 // JVMTI get stack traces at safepoint.
1509 VM_GetThreadListStackTraces op(this, thread_count, thread_list, max_frame_count);
1510 VMThread::execute(&op);
1511 err = op.result();
1512 if (err == JVMTI_ERROR_NONE) {
1513 *stack_info_ptr = op.stack_info();
1514 }
1515 return err;
1516 } /* end GetThreadListStackTraces */
1517
1518
1519 // Threads_lock NOT held, java_thread not protected by lock
1520 // java_thread - pre-checked
1521 // count_ptr - pre-checked for NULL
1522 jvmtiError
1523 JvmtiEnv::GetFrameCount(JavaThread* java_thread, jint* count_ptr) {
1524 jvmtiError err = JVMTI_ERROR_NONE;
1525
1526 // retrieve or create JvmtiThreadState.
1527 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1528 if (state == NULL) {
1529 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1530 }
1531
1532 // It is only safe to perform the direct operation on the current
1533 // thread. All other usage needs to use a vm-safepoint-op for safety.
1534 if (java_thread == JavaThread::current()) {
1535 err = get_frame_count(state, count_ptr);
1536 } else {
1537 // get java stack frame count at safepoint.
1538 VM_GetFrameCount op(this, state, count_ptr);
1539 VMThread::execute(&op);
1540 err = op.result();
1541 }
1542 return err;
1543 } /* end GetFrameCount */
1544
1545
1546 // Threads_lock NOT held, java_thread not protected by lock
1547 // java_thread - pre-checked
1548 jvmtiError
1549 JvmtiEnv::PopFrame(JavaThread* java_thread) {
1550 JavaThread* current_thread = JavaThread::current();
1551 HandleMark hm(current_thread);
1552 uint32_t debug_bits = 0;
1553
1554 // retrieve or create the state
1555 JvmtiThreadState* state = JvmtiThreadState::state_for(java_thread);
1556 if (state == NULL) {
1557 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1558 }
1559
1560 // Check if java_thread is fully suspended
1561 if (!is_thread_fully_suspended(java_thread, true /* wait for suspend completion */, &debug_bits)) {
1562 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1563 }
1564 // Check to see if a PopFrame was already in progress
1565 if (java_thread->popframe_condition() != JavaThread::popframe_inactive) {
1566 // Probably possible for JVMTI clients to trigger this, but the
1567 // JPDA backend shouldn't allow this to happen
1568 return JVMTI_ERROR_INTERNAL;
1569 }
1570
1571 {
1572 // Was workaround bug
1573 // 4812902: popFrame hangs if the method is waiting at a synchronize
1574 // Catch this condition and return an error to avoid hanging.
1575 // Now JVMTI spec allows an implementation to bail out with an opaque frame error.
1576 OSThread* osThread = java_thread->osthread();
1577 if (osThread->get_state() == MONITOR_WAIT) {
1578 return JVMTI_ERROR_OPAQUE_FRAME;
1579 }
1580 }
1581
1582 {
1583 ResourceMark rm(current_thread);
1584 // Check if there are more than one Java frame in this thread, that the top two frames
1585 // are Java (not native) frames, and that there is no intervening VM frame
1586 int frame_count = 0;
1587 bool is_interpreted[2];
1588 intptr_t *frame_sp[2];
1589 // The 2-nd arg of constructor is needed to stop iterating at java entry frame.
1590 for (vframeStream vfs(java_thread, true); !vfs.at_end(); vfs.next()) {
1591 methodHandle mh(current_thread, vfs.method());
1592 if (mh->is_native()) return(JVMTI_ERROR_OPAQUE_FRAME);
1593 is_interpreted[frame_count] = vfs.is_interpreted_frame();
1594 frame_sp[frame_count] = vfs.frame_id();
1595 if (++frame_count > 1) break;
1596 }
1597 if (frame_count < 2) {
1598 // We haven't found two adjacent non-native Java frames on the top.
1599 // There can be two situations here:
1600 // 1. There are no more java frames
1601 // 2. Two top java frames are separated by non-java native frames
1602 if(vframeFor(java_thread, 1) == NULL) {
1603 return JVMTI_ERROR_NO_MORE_FRAMES;
1604 } else {
1605 // Intervening non-java native or VM frames separate java frames.
1606 // Current implementation does not support this. See bug #5031735.
1607 // In theory it is possible to pop frames in such cases.
1608 return JVMTI_ERROR_OPAQUE_FRAME;
1609 }
1610 }
1611
1612 // If any of the top 2 frames is a compiled one, need to deoptimize it
1613 for (int i = 0; i < 2; i++) {
1614 if (!is_interpreted[i]) {
1615 Deoptimization::deoptimize_frame(java_thread, frame_sp[i]);
1616 }
1617 }
1618
1619 // Update the thread state to reflect that the top frame is popped
1620 // so that cur_stack_depth is maintained properly and all frameIDs
1621 // are invalidated.
1622 // The current frame will be popped later when the suspended thread
1623 // is resumed and right before returning from VM to Java.
1624 // (see call_VM_base() in assembler_<cpu>.cpp).
1625
1626 // It's fine to update the thread state here because no JVMTI events
1627 // shall be posted for this PopFrame.
1628
1629 // It is only safe to perform the direct operation on the current
1630 // thread. All other usage needs to use a vm-safepoint-op for safety.
1631 if (java_thread == JavaThread::current()) {
1632 state->update_for_pop_top_frame();
1633 } else {
1634 VM_UpdateForPopTopFrame op(state);
1635 VMThread::execute(&op);
1636 jvmtiError err = op.result();
1637 if (err != JVMTI_ERROR_NONE) {
1638 return err;
1639 }
1640 }
1641
1642 java_thread->set_popframe_condition(JavaThread::popframe_pending_bit);
1643 // Set pending step flag for this popframe and it is cleared when next
1644 // step event is posted.
1645 state->set_pending_step_for_popframe();
1646 }
1647
1648 return JVMTI_ERROR_NONE;
1649 } /* end PopFrame */
1650
1651
1652 // Threads_lock NOT held, java_thread not protected by lock
1653 // java_thread - pre-checked
1654 // java_thread - unchecked
1655 // depth - pre-checked as non-negative
1656 // method_ptr - pre-checked for NULL
1657 // location_ptr - pre-checked for NULL
1658 jvmtiError
1659 JvmtiEnv::GetFrameLocation(JavaThread* java_thread, jint depth, jmethodID* method_ptr, jlocation* location_ptr) {
1660 jvmtiError err = JVMTI_ERROR_NONE;
1661
1662 // It is only safe to perform the direct operation on the current
1663 // thread. All other usage needs to use a vm-safepoint-op for safety.
1664 if (java_thread == JavaThread::current()) {
1665 err = get_frame_location(java_thread, depth, method_ptr, location_ptr);
1666 } else {
1667 // JVMTI get java stack frame location at safepoint.
1668 VM_GetFrameLocation op(this, java_thread, depth, method_ptr, location_ptr);
1669 VMThread::execute(&op);
1670 err = op.result();
1671 }
1672 return err;
1673 } /* end GetFrameLocation */
1674
1675
1676 // Threads_lock NOT held, java_thread not protected by lock
1677 // java_thread - pre-checked
1678 // java_thread - unchecked
1679 // depth - pre-checked as non-negative
1680 jvmtiError
1681 JvmtiEnv::NotifyFramePop(JavaThread* java_thread, jint depth) {
1682 jvmtiError err = JVMTI_ERROR_NONE;
1683 ResourceMark rm;
1684 uint32_t debug_bits = 0;
1685
1686 JvmtiThreadState *state = JvmtiThreadState::state_for(java_thread);
1687 if (state == NULL) {
1688 return JVMTI_ERROR_THREAD_NOT_ALIVE;
1689 }
1690
1691 if (!JvmtiEnv::is_thread_fully_suspended(java_thread, true, &debug_bits)) {
1692 return JVMTI_ERROR_THREAD_NOT_SUSPENDED;
1693 }
1694
1695 if (TraceJVMTICalls) {
1696 JvmtiSuspendControl::print();
1697 }
1698
1699 vframe *vf = vframeFor(java_thread, depth);
1700 if (vf == NULL) {
1701 return JVMTI_ERROR_NO_MORE_FRAMES;
1702 }
1703
1704 if (!vf->is_java_frame() || ((javaVFrame*) vf)->method()->is_native()) {
1705 return JVMTI_ERROR_OPAQUE_FRAME;
1706 }
1707
1708 assert(vf->frame_pointer() != NULL, "frame pointer mustn't be NULL");
1709
1710 // It is only safe to perform the direct operation on the current
1711 // thread. All other usage needs to use a vm-safepoint-op for safety.
1712 if (java_thread == JavaThread::current()) {
1713 int frame_number = state->count_frames() - depth;
1714 state->env_thread_state(this)->set_frame_pop(frame_number);
1715 } else {
1716 VM_SetFramePop op(this, state, depth);
1717 VMThread::execute(&op);
1718 err = op.result();
1719 }
1720 return err;
1721 } /* end NotifyFramePop */
1722
1723
1724 //
1725 // Force Early Return functions
1726 //
1727
1728 // Threads_lock NOT held, java_thread not protected by lock
1729 // java_thread - pre-checked
1730 jvmtiError
1731 JvmtiEnv::ForceEarlyReturnObject(JavaThread* java_thread, jobject value) {
1732 jvalue val;
1733 val.l = value;
1734 return force_early_return(java_thread, val, atos);
1735 } /* end ForceEarlyReturnObject */
1736
1737
1738 // Threads_lock NOT held, java_thread not protected by lock
1739 // java_thread - pre-checked
1740 jvmtiError
1741 JvmtiEnv::ForceEarlyReturnInt(JavaThread* java_thread, jint value) {
1742 jvalue val;
1743 val.i = value;
1744 return force_early_return(java_thread, val, itos);
1745 } /* end ForceEarlyReturnInt */
1746
1747
1748 // Threads_lock NOT held, java_thread not protected by lock
1749 // java_thread - pre-checked
1750 jvmtiError
1751 JvmtiEnv::ForceEarlyReturnLong(JavaThread* java_thread, jlong value) {
1752 jvalue val;
1753 val.j = value;
1754 return force_early_return(java_thread, val, ltos);
1755 } /* end ForceEarlyReturnLong */
1756
1757
1758 // Threads_lock NOT held, java_thread not protected by lock
1759 // java_thread - pre-checked
1760 jvmtiError
1761 JvmtiEnv::ForceEarlyReturnFloat(JavaThread* java_thread, jfloat value) {
1762 jvalue val;
1763 val.f = value;
1764 return force_early_return(java_thread, val, ftos);
1765 } /* end ForceEarlyReturnFloat */
1766
1767
1768 // Threads_lock NOT held, java_thread not protected by lock
1769 // java_thread - pre-checked
1770 jvmtiError
1771 JvmtiEnv::ForceEarlyReturnDouble(JavaThread* java_thread, jdouble value) {
1772 jvalue val;
1773 val.d = value;
1774 return force_early_return(java_thread, val, dtos);
1775 } /* end ForceEarlyReturnDouble */
1776
1777
1778 // Threads_lock NOT held, java_thread not protected by lock
1779 // java_thread - pre-checked
1780 jvmtiError
1781 JvmtiEnv::ForceEarlyReturnVoid(JavaThread* java_thread) {
1782 jvalue val;
1783 val.j = 0L;
1784 return force_early_return(java_thread, val, vtos);
1785 } /* end ForceEarlyReturnVoid */
1786
1787
1788 //
1789 // Heap functions
1790 //
1791
1792 // klass - NULL is a valid value, must be checked
1793 // initial_object - NULL is a valid value, must be checked
1794 // callbacks - pre-checked for NULL
1795 // user_data - NULL is a valid value, must be checked
1796 jvmtiError
1797 JvmtiEnv::FollowReferences(jint heap_filter, jclass klass, jobject initial_object, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1798 // check klass if provided
1799 Klass* k = NULL;
1800 if (klass != NULL) {
1801 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1802 if (k_mirror == NULL) {
1803 return JVMTI_ERROR_INVALID_CLASS;
1804 }
1805 if (java_lang_Class::is_primitive(k_mirror)) {
1806 return JVMTI_ERROR_NONE;
1807 }
1808 k = java_lang_Class::as_Klass(k_mirror);
1809 if (klass == NULL) {
1810 return JVMTI_ERROR_INVALID_CLASS;
1811 }
1812 }
1813
1814 if (initial_object != NULL) {
1815 oop init_obj = JNIHandles::resolve_external_guard(initial_object);
1816 if (init_obj == NULL) {
1817 return JVMTI_ERROR_INVALID_OBJECT;
1818 }
1819 }
1820
1821 Thread *thread = Thread::current();
1822 HandleMark hm(thread);
1823
1824 TraceTime t("FollowReferences", TRACETIME_LOG(Debug, jvmti, objecttagging));
1825 JvmtiTagMap::tag_map_for(this)->follow_references(heap_filter, k, initial_object, callbacks, user_data);
1826 return JVMTI_ERROR_NONE;
1827 } /* end FollowReferences */
1828
1829
1830 // klass - NULL is a valid value, must be checked
1831 // callbacks - pre-checked for NULL
1832 // user_data - NULL is a valid value, must be checked
1833 jvmtiError
1834 JvmtiEnv::IterateThroughHeap(jint heap_filter, jclass klass, const jvmtiHeapCallbacks* callbacks, const void* user_data) {
1835 // check klass if provided
1836 Klass* k = NULL;
1837 if (klass != NULL) {
1838 oop k_mirror = JNIHandles::resolve_external_guard(klass);
1839 if (k_mirror == NULL) {
1840 return JVMTI_ERROR_INVALID_CLASS;
1841 }
1842 if (java_lang_Class::is_primitive(k_mirror)) {
1843 return JVMTI_ERROR_NONE;
1844 }
1845 k = java_lang_Class::as_Klass(k_mirror);
1846 if (k == NULL) {
1847 return JVMTI_ERROR_INVALID_CLASS;
1848 }
1849 }
1850
1851 TraceTime t("IterateThroughHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
1852 JvmtiTagMap::tag_map_for(this)->iterate_through_heap(heap_filter, k, callbacks, user_data);
1853 return JVMTI_ERROR_NONE;
1854 } /* end IterateThroughHeap */
1855
1856
1857 // tag_ptr - pre-checked for NULL
1858 jvmtiError
1859 JvmtiEnv::GetTag(jobject object, jlong* tag_ptr) {
1860 oop o = JNIHandles::resolve_external_guard(object);
1861 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1862 *tag_ptr = JvmtiTagMap::tag_map_for(this)->get_tag(object);
1863 return JVMTI_ERROR_NONE;
1864 } /* end GetTag */
1865
1866
1867 jvmtiError
1868 JvmtiEnv::SetTag(jobject object, jlong tag) {
1869 oop o = JNIHandles::resolve_external_guard(object);
1870 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1871 JvmtiTagMap::tag_map_for(this)->set_tag(object, tag);
1872 return JVMTI_ERROR_NONE;
1873 } /* end SetTag */
1874
1875
1876 // tag_count - pre-checked to be greater than or equal to 0
1877 // tags - pre-checked for NULL
1878 // count_ptr - pre-checked for NULL
1879 // object_result_ptr - NULL is a valid value, must be checked
1880 // tag_result_ptr - NULL is a valid value, must be checked
1881 jvmtiError
1882 JvmtiEnv::GetObjectsWithTags(jint tag_count, const jlong* tags, jint* count_ptr, jobject** object_result_ptr, jlong** tag_result_ptr) {
1883 TraceTime t("GetObjectsWithTags", TRACETIME_LOG(Debug, jvmti, objecttagging));
1884 return JvmtiTagMap::tag_map_for(this)->get_objects_with_tags((jlong*)tags, tag_count, count_ptr, object_result_ptr, tag_result_ptr);
1885 } /* end GetObjectsWithTags */
1886
1887
1888 jvmtiError
1889 JvmtiEnv::ForceGarbageCollection() {
1890 Universe::heap()->collect(GCCause::_jvmti_force_gc);
1891 return JVMTI_ERROR_NONE;
1892 } /* end ForceGarbageCollection */
1893
1894
1895 //
1896 // Heap (1.0) functions
1897 //
1898
1899 // object_reference_callback - pre-checked for NULL
1900 // user_data - NULL is a valid value, must be checked
1901 jvmtiError
1902 JvmtiEnv::IterateOverObjectsReachableFromObject(jobject object, jvmtiObjectReferenceCallback object_reference_callback, const void* user_data) {
1903 oop o = JNIHandles::resolve_external_guard(object);
1904 NULL_CHECK(o, JVMTI_ERROR_INVALID_OBJECT);
1905 JvmtiTagMap::tag_map_for(this)->iterate_over_objects_reachable_from_object(object, object_reference_callback, user_data);
1906 return JVMTI_ERROR_NONE;
1907 } /* end IterateOverObjectsReachableFromObject */
1908
1909
1910 // heap_root_callback - NULL is a valid value, must be checked
1911 // stack_ref_callback - NULL is a valid value, must be checked
1912 // object_ref_callback - NULL is a valid value, must be checked
1913 // user_data - NULL is a valid value, must be checked
1914 jvmtiError
1915 JvmtiEnv::IterateOverReachableObjects(jvmtiHeapRootCallback heap_root_callback, jvmtiStackReferenceCallback stack_ref_callback, jvmtiObjectReferenceCallback object_ref_callback, const void* user_data) {
1916 TraceTime t("IterateOverReachableObjects", TRACETIME_LOG(Debug, jvmti, objecttagging));
1917 JvmtiTagMap::tag_map_for(this)->iterate_over_reachable_objects(heap_root_callback, stack_ref_callback, object_ref_callback, user_data);
1918 return JVMTI_ERROR_NONE;
1919 } /* end IterateOverReachableObjects */
1920
1921
1922 // heap_object_callback - pre-checked for NULL
1923 // user_data - NULL is a valid value, must be checked
1924 jvmtiError
1925 JvmtiEnv::IterateOverHeap(jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
1926 TraceTime t("IterateOverHeap", TRACETIME_LOG(Debug, jvmti, objecttagging));
1927 Thread *thread = Thread::current();
1928 HandleMark hm(thread);
1929 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, NULL, heap_object_callback, user_data);
1930 return JVMTI_ERROR_NONE;
1931 } /* end IterateOverHeap */
1932
1933
1934 // k_mirror - may be primitive, this must be checked
1935 // heap_object_callback - pre-checked for NULL
1936 // user_data - NULL is a valid value, must be checked
1937 jvmtiError
1938 JvmtiEnv::IterateOverInstancesOfClass(oop k_mirror, jvmtiHeapObjectFilter object_filter, jvmtiHeapObjectCallback heap_object_callback, const void* user_data) {
1939 if (java_lang_Class::is_primitive(k_mirror)) {
1940 // DO PRIMITIVE CLASS PROCESSING
1941 return JVMTI_ERROR_NONE;
1942 }
1943 Klass* klass = java_lang_Class::as_Klass(k_mirror);
1944 if (klass == NULL) {
1945 return JVMTI_ERROR_INVALID_CLASS;
1946 }
1947 TraceTime t("IterateOverInstancesOfClass", TRACETIME_LOG(Debug, jvmti, objecttagging));
1948 JvmtiTagMap::tag_map_for(this)->iterate_over_heap(object_filter, klass, heap_object_callback, user_data);
1949 return JVMTI_ERROR_NONE;
1950 } /* end IterateOverInstancesOfClass */
1951
1952 // Start the sampler.
1953 jvmtiError
1954 JvmtiEnv::StartHeapSampling(jint monitoring_rate, jint max_gc_storage) {
1955 if (monitoring_rate < 0) {
1956 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
1957 }
1958
1959 HeapThreadTransition htt(Thread::current());
1960 HeapMonitoring::initialize_profiling(monitoring_rate, max_gc_storage);
1961 return JVMTI_ERROR_NONE;
1962 } /* end StartHeapSampling */
1963
1964 // Stop the sampler.
1965 jvmtiError
1966 JvmtiEnv::StopHeapSampling() {
1967 HeapThreadTransition htt(Thread::current());
1968 HeapMonitoring::stop_profiling();
1969 return JVMTI_ERROR_NONE;
1970 } /* end StopHeapSampling */
1971
1972 // Get the currently live sampled allocations.
1973 jvmtiError
1974 JvmtiEnv::GetLiveTraces(jvmtiStackTraces* stack_traces) {
1975 HeapThreadTransition htt(Thread::current());
1976 if (stack_traces == NULL) {
1977 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
1978 }
1979
1980 HeapMonitoring::get_live_traces(stack_traces);
1981 return JVMTI_ERROR_NONE;
1982 } /* end GetLiveTraces */
1983
1984 // Get the currently live sampled allocations.
1985 jvmtiError
1986 JvmtiEnv::GetGarbageTraces(jvmtiStackTraces* stack_traces) {
1987 HeapThreadTransition htt(Thread::current());
1988 if (stack_traces == NULL) {
1989 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
1990 }
1991
1992 HeapMonitoring::get_garbage_traces(stack_traces);
1993 return JVMTI_ERROR_NONE;
1994 } /* end GetGarbageTraces */
1995
1996 // Get the currently live sampled allocations.
1997 jvmtiError
1998 JvmtiEnv::GetFrequentGarbageTraces(jvmtiStackTraces* stack_traces) {
1999 HeapThreadTransition htt(Thread::current());
2000 if (stack_traces == NULL) {
2001 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
2002 }
2003
2004 HeapMonitoring::get_frequent_garbage_traces(stack_traces);
2005 return JVMTI_ERROR_NONE;
2006 } /* end GetFrequentGarbageTraces */
2007
2008 // Release sampled traces.
2009 jvmtiError
2010 JvmtiEnv::ReleaseTraces(jvmtiStackTraces* stack_traces) {
2011 if (stack_traces == NULL) {
2012 return JVMTI_ERROR_NONE;
2013 }
2014 HeapMonitoring::release_traces(stack_traces);
2015 return JVMTI_ERROR_NONE;
2016 } /* end ReleaseTraces */
2017
2018 // Get the heap sampling statistics.
2019 jvmtiError
2020 JvmtiEnv::GetHeapSamplingStats(jvmtiHeapSamplingStats* stats) {
2021 if (stats == NULL) {
2022 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
2023 }
2024 HeapMonitoring::get_sampling_statistics(stats);
2025 return JVMTI_ERROR_NONE;
2026 } /* end GetHeapSamplingStats */
2027
2028 //
2029 // Local Variable functions
2030 //
2031
2032 // Threads_lock NOT held, java_thread not protected by lock
2033 // java_thread - pre-checked
2034 // java_thread - unchecked
2035 // depth - pre-checked as non-negative
2036 // value_ptr - pre-checked for NULL
2037 jvmtiError
2038 JvmtiEnv::GetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject* value_ptr) {
2039 JavaThread* current_thread = JavaThread::current();
2040 // rm object is created to clean up the javaVFrame created in
2041 // doit_prologue(), but after doit() is finished with it.
2042 ResourceMark rm(current_thread);
2043
2044 VM_GetOrSetLocal op(java_thread, current_thread, depth, slot);
2045 VMThread::execute(&op);
2046 jvmtiError err = op.result();
2047 if (err != JVMTI_ERROR_NONE) {
2048 return err;
2049 } else {
2050 *value_ptr = op.value().l;
2051 return JVMTI_ERROR_NONE;
2052 }
2053 } /* end GetLocalObject */
2054
2055 // Threads_lock NOT held, java_thread not protected by lock
2056 // java_thread - pre-checked
2057 // java_thread - unchecked
2058 // depth - pre-checked as non-negative
2059 // value - pre-checked for NULL
2060 jvmtiError
2061 JvmtiEnv::GetLocalInstance(JavaThread* java_thread, jint depth, jobject* value_ptr){
2062 JavaThread* current_thread = JavaThread::current();
2063 // rm object is created to clean up the javaVFrame created in
2064 // doit_prologue(), but after doit() is finished with it.
2065 ResourceMark rm(current_thread);
2066
2067 VM_GetReceiver op(java_thread, current_thread, depth);
2068 VMThread::execute(&op);
2069 jvmtiError err = op.result();
2070 if (err != JVMTI_ERROR_NONE) {
2071 return err;
2072 } else {
2073 *value_ptr = op.value().l;
2074 return JVMTI_ERROR_NONE;
2075 }
2076 } /* end GetLocalInstance */
2077
2078
2079 // Threads_lock NOT held, java_thread not protected by lock
2080 // java_thread - pre-checked
2081 // java_thread - unchecked
2082 // depth - pre-checked as non-negative
2083 // value_ptr - pre-checked for NULL
2084 jvmtiError
2085 JvmtiEnv::GetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint* value_ptr) {
2086 // rm object is created to clean up the javaVFrame created in
2087 // doit_prologue(), but after doit() is finished with it.
2088 ResourceMark rm;
2089
2090 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT);
2091 VMThread::execute(&op);
2092 *value_ptr = op.value().i;
2093 return op.result();
2094 } /* end GetLocalInt */
2095
2096
2097 // Threads_lock NOT held, java_thread not protected by lock
2098 // java_thread - pre-checked
2099 // java_thread - unchecked
2100 // depth - pre-checked as non-negative
2101 // value_ptr - pre-checked for NULL
2102 jvmtiError
2103 JvmtiEnv::GetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong* value_ptr) {
2104 // rm object is created to clean up the javaVFrame created in
2105 // doit_prologue(), but after doit() is finished with it.
2106 ResourceMark rm;
2107
2108 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG);
2109 VMThread::execute(&op);
2110 *value_ptr = op.value().j;
2111 return op.result();
2112 } /* end GetLocalLong */
2113
2114
2115 // Threads_lock NOT held, java_thread not protected by lock
2116 // java_thread - pre-checked
2117 // java_thread - unchecked
2118 // depth - pre-checked as non-negative
2119 // value_ptr - pre-checked for NULL
2120 jvmtiError
2121 JvmtiEnv::GetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat* value_ptr) {
2122 // rm object is created to clean up the javaVFrame created in
2123 // doit_prologue(), but after doit() is finished with it.
2124 ResourceMark rm;
2125
2126 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT);
2127 VMThread::execute(&op);
2128 *value_ptr = op.value().f;
2129 return op.result();
2130 } /* end GetLocalFloat */
2131
2132
2133 // Threads_lock NOT held, java_thread not protected by lock
2134 // java_thread - pre-checked
2135 // java_thread - unchecked
2136 // depth - pre-checked as non-negative
2137 // value_ptr - pre-checked for NULL
2138 jvmtiError
2139 JvmtiEnv::GetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble* value_ptr) {
2140 // rm object is created to clean up the javaVFrame created in
2141 // doit_prologue(), but after doit() is finished with it.
2142 ResourceMark rm;
2143
2144 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE);
2145 VMThread::execute(&op);
2146 *value_ptr = op.value().d;
2147 return op.result();
2148 } /* end GetLocalDouble */
2149
2150
2151 // Threads_lock NOT held, java_thread not protected by lock
2152 // java_thread - pre-checked
2153 // java_thread - unchecked
2154 // depth - pre-checked as non-negative
2155 jvmtiError
2156 JvmtiEnv::SetLocalObject(JavaThread* java_thread, jint depth, jint slot, jobject value) {
2157 // rm object is created to clean up the javaVFrame created in
2158 // doit_prologue(), but after doit() is finished with it.
2159 ResourceMark rm;
2160 jvalue val;
2161 val.l = value;
2162 VM_GetOrSetLocal op(java_thread, depth, slot, T_OBJECT, val);
2163 VMThread::execute(&op);
2164 return op.result();
2165 } /* end SetLocalObject */
2166
2167
2168 // Threads_lock NOT held, java_thread not protected by lock
2169 // java_thread - pre-checked
2170 // java_thread - unchecked
2171 // depth - pre-checked as non-negative
2172 jvmtiError
2173 JvmtiEnv::SetLocalInt(JavaThread* java_thread, jint depth, jint slot, jint value) {
2174 // rm object is created to clean up the javaVFrame created in
2175 // doit_prologue(), but after doit() is finished with it.
2176 ResourceMark rm;
2177 jvalue val;
2178 val.i = value;
2179 VM_GetOrSetLocal op(java_thread, depth, slot, T_INT, val);
2180 VMThread::execute(&op);
2181 return op.result();
2182 } /* end SetLocalInt */
2183
2184
2185 // Threads_lock NOT held, java_thread not protected by lock
2186 // java_thread - pre-checked
2187 // java_thread - unchecked
2188 // depth - pre-checked as non-negative
2189 jvmtiError
2190 JvmtiEnv::SetLocalLong(JavaThread* java_thread, jint depth, jint slot, jlong value) {
2191 // rm object is created to clean up the javaVFrame created in
2192 // doit_prologue(), but after doit() is finished with it.
2193 ResourceMark rm;
2194 jvalue val;
2195 val.j = value;
2196 VM_GetOrSetLocal op(java_thread, depth, slot, T_LONG, val);
2197 VMThread::execute(&op);
2198 return op.result();
2199 } /* end SetLocalLong */
2200
2201
2202 // Threads_lock NOT held, java_thread not protected by lock
2203 // java_thread - pre-checked
2204 // java_thread - unchecked
2205 // depth - pre-checked as non-negative
2206 jvmtiError
2207 JvmtiEnv::SetLocalFloat(JavaThread* java_thread, jint depth, jint slot, jfloat value) {
2208 // rm object is created to clean up the javaVFrame created in
2209 // doit_prologue(), but after doit() is finished with it.
2210 ResourceMark rm;
2211 jvalue val;
2212 val.f = value;
2213 VM_GetOrSetLocal op(java_thread, depth, slot, T_FLOAT, val);
2214 VMThread::execute(&op);
2215 return op.result();
2216 } /* end SetLocalFloat */
2217
2218
2219 // Threads_lock NOT held, java_thread not protected by lock
2220 // java_thread - pre-checked
2221 // java_thread - unchecked
2222 // depth - pre-checked as non-negative
2223 jvmtiError
2224 JvmtiEnv::SetLocalDouble(JavaThread* java_thread, jint depth, jint slot, jdouble value) {
2225 // rm object is created to clean up the javaVFrame created in
2226 // doit_prologue(), but after doit() is finished with it.
2227 ResourceMark rm;
2228 jvalue val;
2229 val.d = value;
2230 VM_GetOrSetLocal op(java_thread, depth, slot, T_DOUBLE, val);
2231 VMThread::execute(&op);
2232 return op.result();
2233 } /* end SetLocalDouble */
2234
2235
2236 //
2237 // Breakpoint functions
2238 //
2239
2240 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2241 jvmtiError
2242 JvmtiEnv::SetBreakpoint(Method* method_oop, jlocation location) {
2243 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2244 if (location < 0) { // simple invalid location check first
2245 return JVMTI_ERROR_INVALID_LOCATION;
2246 }
2247 // verify that the breakpoint is not past the end of the method
2248 if (location >= (jlocation) method_oop->code_size()) {
2249 return JVMTI_ERROR_INVALID_LOCATION;
2250 }
2251
2252 ResourceMark rm;
2253 JvmtiBreakpoint bp(method_oop, location);
2254 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2255 if (jvmti_breakpoints.set(bp) == JVMTI_ERROR_DUPLICATE)
2256 return JVMTI_ERROR_DUPLICATE;
2257
2258 if (TraceJVMTICalls) {
2259 jvmti_breakpoints.print();
2260 }
2261
2262 return JVMTI_ERROR_NONE;
2263 } /* end SetBreakpoint */
2264
2265
2266 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2267 jvmtiError
2268 JvmtiEnv::ClearBreakpoint(Method* method_oop, jlocation location) {
2269 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2270
2271 if (location < 0) { // simple invalid location check first
2272 return JVMTI_ERROR_INVALID_LOCATION;
2273 }
2274
2275 // verify that the breakpoint is not past the end of the method
2276 if (location >= (jlocation) method_oop->code_size()) {
2277 return JVMTI_ERROR_INVALID_LOCATION;
2278 }
2279
2280 JvmtiBreakpoint bp(method_oop, location);
2281
2282 JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
2283 if (jvmti_breakpoints.clear(bp) == JVMTI_ERROR_NOT_FOUND)
2284 return JVMTI_ERROR_NOT_FOUND;
2285
2286 if (TraceJVMTICalls) {
2287 jvmti_breakpoints.print();
2288 }
2289
2290 return JVMTI_ERROR_NONE;
2291 } /* end ClearBreakpoint */
2292
2293
2294 //
2295 // Watched Field functions
2296 //
2297
2298 jvmtiError
2299 JvmtiEnv::SetFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2300 // make sure we haven't set this watch before
2301 if (fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_DUPLICATE;
2302 fdesc_ptr->set_is_field_access_watched(true);
2303
2304 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, true);
2305
2306 return JVMTI_ERROR_NONE;
2307 } /* end SetFieldAccessWatch */
2308
2309
2310 jvmtiError
2311 JvmtiEnv::ClearFieldAccessWatch(fieldDescriptor* fdesc_ptr) {
2312 // make sure we have a watch to clear
2313 if (!fdesc_ptr->is_field_access_watched()) return JVMTI_ERROR_NOT_FOUND;
2314 fdesc_ptr->set_is_field_access_watched(false);
2315
2316 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_ACCESS, false);
2317
2318 return JVMTI_ERROR_NONE;
2319 } /* end ClearFieldAccessWatch */
2320
2321
2322 jvmtiError
2323 JvmtiEnv::SetFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2324 // make sure we haven't set this watch before
2325 if (fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_DUPLICATE;
2326 fdesc_ptr->set_is_field_modification_watched(true);
2327
2328 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, true);
2329
2330 return JVMTI_ERROR_NONE;
2331 } /* end SetFieldModificationWatch */
2332
2333
2334 jvmtiError
2335 JvmtiEnv::ClearFieldModificationWatch(fieldDescriptor* fdesc_ptr) {
2336 // make sure we have a watch to clear
2337 if (!fdesc_ptr->is_field_modification_watched()) return JVMTI_ERROR_NOT_FOUND;
2338 fdesc_ptr->set_is_field_modification_watched(false);
2339
2340 JvmtiEventController::change_field_watch(JVMTI_EVENT_FIELD_MODIFICATION, false);
2341
2342 return JVMTI_ERROR_NONE;
2343 } /* end ClearFieldModificationWatch */
2344
2345 //
2346 // Class functions
2347 //
2348
2349
2350 // k_mirror - may be primitive, this must be checked
2351 // signature_ptr - NULL is a valid value, must be checked
2352 // generic_ptr - NULL is a valid value, must be checked
2353 jvmtiError
2354 JvmtiEnv::GetClassSignature(oop k_mirror, char** signature_ptr, char** generic_ptr) {
2355 ResourceMark rm;
2356 bool isPrimitive = java_lang_Class::is_primitive(k_mirror);
2357 Klass* k = NULL;
2358 if (!isPrimitive) {
2359 k = java_lang_Class::as_Klass(k_mirror);
2360 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2361 }
2362 if (signature_ptr != NULL) {
2363 char* result = NULL;
2364 if (isPrimitive) {
2365 char tchar = type2char(java_lang_Class::primitive_type(k_mirror));
2366 result = (char*) jvmtiMalloc(2);
2367 result[0] = tchar;
2368 result[1] = '\0';
2369 } else {
2370 const char* class_sig = k->signature_name();
2371 result = (char *) jvmtiMalloc(strlen(class_sig)+1);
2372 strcpy(result, class_sig);
2373 }
2374 *signature_ptr = result;
2375 }
2376 if (generic_ptr != NULL) {
2377 *generic_ptr = NULL;
2378 if (!isPrimitive && k->is_instance_klass()) {
2379 Symbol* soo = InstanceKlass::cast(k)->generic_signature();
2380 if (soo != NULL) {
2381 const char *gen_sig = soo->as_C_string();
2382 if (gen_sig != NULL) {
2383 char* gen_result;
2384 jvmtiError err = allocate(strlen(gen_sig) + 1,
2385 (unsigned char **)&gen_result);
2386 if (err != JVMTI_ERROR_NONE) {
2387 return err;
2388 }
2389 strcpy(gen_result, gen_sig);
2390 *generic_ptr = gen_result;
2391 }
2392 }
2393 }
2394 }
2395 return JVMTI_ERROR_NONE;
2396 } /* end GetClassSignature */
2397
2398
2399 // k_mirror - may be primitive, this must be checked
2400 // status_ptr - pre-checked for NULL
2401 jvmtiError
2402 JvmtiEnv::GetClassStatus(oop k_mirror, jint* status_ptr) {
2403 jint result = 0;
2404 if (java_lang_Class::is_primitive(k_mirror)) {
2405 result |= JVMTI_CLASS_STATUS_PRIMITIVE;
2406 } else {
2407 Klass* k = java_lang_Class::as_Klass(k_mirror);
2408 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2409 result = k->jvmti_class_status();
2410 }
2411 *status_ptr = result;
2412
2413 return JVMTI_ERROR_NONE;
2414 } /* end GetClassStatus */
2415
2416
2417 // k_mirror - may be primitive, this must be checked
2418 // source_name_ptr - pre-checked for NULL
2419 jvmtiError
2420 JvmtiEnv::GetSourceFileName(oop k_mirror, char** source_name_ptr) {
2421 if (java_lang_Class::is_primitive(k_mirror)) {
2422 return JVMTI_ERROR_ABSENT_INFORMATION;
2423 }
2424 Klass* k_klass = java_lang_Class::as_Klass(k_mirror);
2425 NULL_CHECK(k_klass, JVMTI_ERROR_INVALID_CLASS);
2426
2427 if (!k_klass->is_instance_klass()) {
2428 return JVMTI_ERROR_ABSENT_INFORMATION;
2429 }
2430
2431 Symbol* sfnOop = InstanceKlass::cast(k_klass)->source_file_name();
2432 NULL_CHECK(sfnOop, JVMTI_ERROR_ABSENT_INFORMATION);
2433 {
2434 JavaThread* current_thread = JavaThread::current();
2435 ResourceMark rm(current_thread);
2436 const char* sfncp = (const char*) sfnOop->as_C_string();
2437 *source_name_ptr = (char *) jvmtiMalloc(strlen(sfncp)+1);
2438 strcpy(*source_name_ptr, sfncp);
2439 }
2440
2441 return JVMTI_ERROR_NONE;
2442 } /* end GetSourceFileName */
2443
2444
2445 // k_mirror - may be primitive, this must be checked
2446 // modifiers_ptr - pre-checked for NULL
2447 jvmtiError
2448 JvmtiEnv::GetClassModifiers(oop k_mirror, jint* modifiers_ptr) {
2449 JavaThread* current_thread = JavaThread::current();
2450 jint result = 0;
2451 if (!java_lang_Class::is_primitive(k_mirror)) {
2452 Klass* k = java_lang_Class::as_Klass(k_mirror);
2453 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2454 result = k->compute_modifier_flags(current_thread);
2455 JavaThread* THREAD = current_thread; // pass to macros
2456 if (HAS_PENDING_EXCEPTION) {
2457 CLEAR_PENDING_EXCEPTION;
2458 return JVMTI_ERROR_INTERNAL;
2459 };
2460
2461 // Reset the deleted ACC_SUPER bit ( deleted in compute_modifier_flags()).
2462 if(k->is_super()) {
2463 result |= JVM_ACC_SUPER;
2464 }
2465 } else {
2466 result = (JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC);
2467 }
2468 *modifiers_ptr = result;
2469
2470 return JVMTI_ERROR_NONE;
2471 } /* end GetClassModifiers */
2472
2473
2474 // k_mirror - may be primitive, this must be checked
2475 // method_count_ptr - pre-checked for NULL
2476 // methods_ptr - pre-checked for NULL
2477 jvmtiError
2478 JvmtiEnv::GetClassMethods(oop k_mirror, jint* method_count_ptr, jmethodID** methods_ptr) {
2479 JavaThread* current_thread = JavaThread::current();
2480 HandleMark hm(current_thread);
2481
2482 if (java_lang_Class::is_primitive(k_mirror)) {
2483 *method_count_ptr = 0;
2484 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2485 return JVMTI_ERROR_NONE;
2486 }
2487 Klass* k = java_lang_Class::as_Klass(k_mirror);
2488 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2489
2490 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2491 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2492 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2493 }
2494
2495 if (!k->is_instance_klass()) {
2496 *method_count_ptr = 0;
2497 *methods_ptr = (jmethodID*) jvmtiMalloc(0 * sizeof(jmethodID));
2498 return JVMTI_ERROR_NONE;
2499 }
2500 InstanceKlass* ik = InstanceKlass::cast(k);
2501 // Allocate the result and fill it in
2502 int result_length = ik->methods()->length();
2503 jmethodID* result_list = (jmethodID*)jvmtiMalloc(result_length * sizeof(jmethodID));
2504 int index;
2505 bool jmethodids_found = true;
2506
2507 if (JvmtiExport::can_maintain_original_method_order()) {
2508 // Use the original method ordering indices stored in the class, so we can emit
2509 // jmethodIDs in the order they appeared in the class file
2510 for (index = 0; index < result_length; index++) {
2511 Method* m = ik->methods()->at(index);
2512 int original_index = ik->method_ordering()->at(index);
2513 assert(original_index >= 0 && original_index < result_length, "invalid original method index");
2514 jmethodID id;
2515 if (jmethodids_found) {
2516 id = m->find_jmethod_id_or_null();
2517 if (id == NULL) {
2518 // If we find an uninitialized value, make sure there is
2519 // enough space for all the uninitialized values we might
2520 // find.
2521 ik->ensure_space_for_methodids(index);
2522 jmethodids_found = false;
2523 id = m->jmethod_id();
2524 }
2525 } else {
2526 id = m->jmethod_id();
2527 }
2528 result_list[original_index] = id;
2529 }
2530 } else {
2531 // otherwise just copy in any order
2532 for (index = 0; index < result_length; index++) {
2533 Method* m = ik->methods()->at(index);
2534 jmethodID id;
2535 if (jmethodids_found) {
2536 id = m->find_jmethod_id_or_null();
2537 if (id == NULL) {
2538 // If we find an uninitialized value, make sure there is
2539 // enough space for all the uninitialized values we might
2540 // find.
2541 ik->ensure_space_for_methodids(index);
2542 jmethodids_found = false;
2543 id = m->jmethod_id();
2544 }
2545 } else {
2546 id = m->jmethod_id();
2547 }
2548 result_list[index] = id;
2549 }
2550 }
2551 // Fill in return value.
2552 *method_count_ptr = result_length;
2553 *methods_ptr = result_list;
2554
2555 return JVMTI_ERROR_NONE;
2556 } /* end GetClassMethods */
2557
2558
2559 // k_mirror - may be primitive, this must be checked
2560 // field_count_ptr - pre-checked for NULL
2561 // fields_ptr - pre-checked for NULL
2562 jvmtiError
2563 JvmtiEnv::GetClassFields(oop k_mirror, jint* field_count_ptr, jfieldID** fields_ptr) {
2564 if (java_lang_Class::is_primitive(k_mirror)) {
2565 *field_count_ptr = 0;
2566 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2567 return JVMTI_ERROR_NONE;
2568 }
2569 JavaThread* current_thread = JavaThread::current();
2570 HandleMark hm(current_thread);
2571 Klass* k = java_lang_Class::as_Klass(k_mirror);
2572 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2573
2574 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2575 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) )) {
2576 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2577 }
2578
2579 if (!k->is_instance_klass()) {
2580 *field_count_ptr = 0;
2581 *fields_ptr = (jfieldID*) jvmtiMalloc(0 * sizeof(jfieldID));
2582 return JVMTI_ERROR_NONE;
2583 }
2584
2585
2586 InstanceKlass* ik = InstanceKlass::cast(k);
2587
2588 int result_count = 0;
2589 // First, count the fields.
2590 FilteredFieldStream flds(ik, true, true);
2591 result_count = flds.field_count();
2592
2593 // Allocate the result and fill it in
2594 jfieldID* result_list = (jfieldID*) jvmtiMalloc(result_count * sizeof(jfieldID));
2595 // The JVMTI spec requires fields in the order they occur in the class file,
2596 // this is the reverse order of what FieldStream hands out.
2597 int id_index = (result_count - 1);
2598
2599 for (FilteredFieldStream src_st(ik, true, true); !src_st.eos(); src_st.next()) {
2600 result_list[id_index--] = jfieldIDWorkaround::to_jfieldID(
2601 ik, src_st.offset(),
2602 src_st.access_flags().is_static());
2603 }
2604 assert(id_index == -1, "just checking");
2605 // Fill in the results
2606 *field_count_ptr = result_count;
2607 *fields_ptr = result_list;
2608
2609 return JVMTI_ERROR_NONE;
2610 } /* end GetClassFields */
2611
2612
2613 // k_mirror - may be primitive, this must be checked
2614 // interface_count_ptr - pre-checked for NULL
2615 // interfaces_ptr - pre-checked for NULL
2616 jvmtiError
2617 JvmtiEnv::GetImplementedInterfaces(oop k_mirror, jint* interface_count_ptr, jclass** interfaces_ptr) {
2618 {
2619 if (java_lang_Class::is_primitive(k_mirror)) {
2620 *interface_count_ptr = 0;
2621 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2622 return JVMTI_ERROR_NONE;
2623 }
2624 JavaThread* current_thread = JavaThread::current();
2625 HandleMark hm(current_thread);
2626 Klass* k = java_lang_Class::as_Klass(k_mirror);
2627 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2628
2629 // Return CLASS_NOT_PREPARED error as per JVMTI spec.
2630 if (!(k->jvmti_class_status() & (JVMTI_CLASS_STATUS_PREPARED|JVMTI_CLASS_STATUS_ARRAY) ))
2631 return JVMTI_ERROR_CLASS_NOT_PREPARED;
2632
2633 if (!k->is_instance_klass()) {
2634 *interface_count_ptr = 0;
2635 *interfaces_ptr = (jclass*) jvmtiMalloc(0 * sizeof(jclass));
2636 return JVMTI_ERROR_NONE;
2637 }
2638
2639 Array<Klass*>* interface_list = InstanceKlass::cast(k)->local_interfaces();
2640 const int result_length = (interface_list == NULL ? 0 : interface_list->length());
2641 jclass* result_list = (jclass*) jvmtiMalloc(result_length * sizeof(jclass));
2642 for (int i_index = 0; i_index < result_length; i_index += 1) {
2643 Klass* klass_at = interface_list->at(i_index);
2644 assert(klass_at->is_klass(), "interfaces must be Klass*s");
2645 assert(klass_at->is_interface(), "interfaces must be interfaces");
2646 oop mirror_at = klass_at->java_mirror();
2647 Handle handle_at = Handle(current_thread, mirror_at);
2648 result_list[i_index] = (jclass) jni_reference(handle_at);
2649 }
2650 *interface_count_ptr = result_length;
2651 *interfaces_ptr = result_list;
2652 }
2653
2654 return JVMTI_ERROR_NONE;
2655 } /* end GetImplementedInterfaces */
2656
2657
2658 // k_mirror - may be primitive, this must be checked
2659 // minor_version_ptr - pre-checked for NULL
2660 // major_version_ptr - pre-checked for NULL
2661 jvmtiError
2662 JvmtiEnv::GetClassVersionNumbers(oop k_mirror, jint* minor_version_ptr, jint* major_version_ptr) {
2663 if (java_lang_Class::is_primitive(k_mirror)) {
2664 return JVMTI_ERROR_ABSENT_INFORMATION;
2665 }
2666 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2667
2668 jint status = klass->jvmti_class_status();
2669 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2670 return JVMTI_ERROR_INVALID_CLASS;
2671 }
2672 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2673 return JVMTI_ERROR_ABSENT_INFORMATION;
2674 }
2675
2676 InstanceKlass* ik = InstanceKlass::cast(klass);
2677 *minor_version_ptr = ik->minor_version();
2678 *major_version_ptr = ik->major_version();
2679
2680 return JVMTI_ERROR_NONE;
2681 } /* end GetClassVersionNumbers */
2682
2683
2684 // k_mirror - may be primitive, this must be checked
2685 // constant_pool_count_ptr - pre-checked for NULL
2686 // constant_pool_byte_count_ptr - pre-checked for NULL
2687 // constant_pool_bytes_ptr - pre-checked for NULL
2688 jvmtiError
2689 JvmtiEnv::GetConstantPool(oop k_mirror, jint* constant_pool_count_ptr, jint* constant_pool_byte_count_ptr, unsigned char** constant_pool_bytes_ptr) {
2690 if (java_lang_Class::is_primitive(k_mirror)) {
2691 return JVMTI_ERROR_ABSENT_INFORMATION;
2692 }
2693
2694 Klass* klass = java_lang_Class::as_Klass(k_mirror);
2695 Thread *thread = Thread::current();
2696 ResourceMark rm(thread);
2697
2698 jint status = klass->jvmti_class_status();
2699 if (status & (JVMTI_CLASS_STATUS_ERROR)) {
2700 return JVMTI_ERROR_INVALID_CLASS;
2701 }
2702 if (status & (JVMTI_CLASS_STATUS_ARRAY)) {
2703 return JVMTI_ERROR_ABSENT_INFORMATION;
2704 }
2705
2706 InstanceKlass* ik = InstanceKlass::cast(klass);
2707 JvmtiConstantPoolReconstituter reconstituter(ik);
2708 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2709 return reconstituter.get_error();
2710 }
2711
2712 unsigned char *cpool_bytes;
2713 int cpool_size = reconstituter.cpool_size();
2714 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2715 return reconstituter.get_error();
2716 }
2717 jvmtiError res = allocate(cpool_size, &cpool_bytes);
2718 if (res != JVMTI_ERROR_NONE) {
2719 return res;
2720 }
2721 reconstituter.copy_cpool_bytes(cpool_bytes);
2722 if (reconstituter.get_error() != JVMTI_ERROR_NONE) {
2723 return reconstituter.get_error();
2724 }
2725
2726 constantPoolHandle constants(thread, ik->constants());
2727 *constant_pool_count_ptr = constants->length();
2728 *constant_pool_byte_count_ptr = cpool_size;
2729 *constant_pool_bytes_ptr = cpool_bytes;
2730
2731 return JVMTI_ERROR_NONE;
2732 } /* end GetConstantPool */
2733
2734
2735 // k_mirror - may be primitive, this must be checked
2736 // is_interface_ptr - pre-checked for NULL
2737 jvmtiError
2738 JvmtiEnv::IsInterface(oop k_mirror, jboolean* is_interface_ptr) {
2739 {
2740 bool result = false;
2741 if (!java_lang_Class::is_primitive(k_mirror)) {
2742 Klass* k = java_lang_Class::as_Klass(k_mirror);
2743 if (k != NULL && k->is_interface()) {
2744 result = true;
2745 }
2746 }
2747 *is_interface_ptr = result;
2748 }
2749
2750 return JVMTI_ERROR_NONE;
2751 } /* end IsInterface */
2752
2753
2754 // k_mirror - may be primitive, this must be checked
2755 // is_array_class_ptr - pre-checked for NULL
2756 jvmtiError
2757 JvmtiEnv::IsArrayClass(oop k_mirror, jboolean* is_array_class_ptr) {
2758 {
2759 bool result = false;
2760 if (!java_lang_Class::is_primitive(k_mirror)) {
2761 Klass* k = java_lang_Class::as_Klass(k_mirror);
2762 if (k != NULL && k->is_array_klass()) {
2763 result = true;
2764 }
2765 }
2766 *is_array_class_ptr = result;
2767 }
2768
2769 return JVMTI_ERROR_NONE;
2770 } /* end IsArrayClass */
2771
2772
2773 // k_mirror - may be primitive, this must be checked
2774 // classloader_ptr - pre-checked for NULL
2775 jvmtiError
2776 JvmtiEnv::GetClassLoader(oop k_mirror, jobject* classloader_ptr) {
2777 {
2778 if (java_lang_Class::is_primitive(k_mirror)) {
2779 *classloader_ptr = (jclass) jni_reference(Handle());
2780 return JVMTI_ERROR_NONE;
2781 }
2782 JavaThread* current_thread = JavaThread::current();
2783 HandleMark hm(current_thread);
2784 Klass* k = java_lang_Class::as_Klass(k_mirror);
2785 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2786
2787 oop result_oop = k->class_loader();
2788 if (result_oop == NULL) {
2789 *classloader_ptr = (jclass) jni_reference(Handle());
2790 return JVMTI_ERROR_NONE;
2791 }
2792 Handle result_handle = Handle(current_thread, result_oop);
2793 jclass result_jnihandle = (jclass) jni_reference(result_handle);
2794 *classloader_ptr = result_jnihandle;
2795 }
2796 return JVMTI_ERROR_NONE;
2797 } /* end GetClassLoader */
2798
2799
2800 // k_mirror - may be primitive, this must be checked
2801 // source_debug_extension_ptr - pre-checked for NULL
2802 jvmtiError
2803 JvmtiEnv::GetSourceDebugExtension(oop k_mirror, char** source_debug_extension_ptr) {
2804 {
2805 if (java_lang_Class::is_primitive(k_mirror)) {
2806 return JVMTI_ERROR_ABSENT_INFORMATION;
2807 }
2808 Klass* k = java_lang_Class::as_Klass(k_mirror);
2809 NULL_CHECK(k, JVMTI_ERROR_INVALID_CLASS);
2810 if (!k->is_instance_klass()) {
2811 return JVMTI_ERROR_ABSENT_INFORMATION;
2812 }
2813 const char* sde = InstanceKlass::cast(k)->source_debug_extension();
2814 NULL_CHECK(sde, JVMTI_ERROR_ABSENT_INFORMATION);
2815
2816 {
2817 *source_debug_extension_ptr = (char *) jvmtiMalloc(strlen(sde)+1);
2818 strcpy(*source_debug_extension_ptr, sde);
2819 }
2820 }
2821
2822 return JVMTI_ERROR_NONE;
2823 } /* end GetSourceDebugExtension */
2824
2825 //
2826 // Object functions
2827 //
2828
2829 // hash_code_ptr - pre-checked for NULL
2830 jvmtiError
2831 JvmtiEnv::GetObjectHashCode(jobject object, jint* hash_code_ptr) {
2832 oop mirror = JNIHandles::resolve_external_guard(object);
2833 NULL_CHECK(mirror, JVMTI_ERROR_INVALID_OBJECT);
2834 NULL_CHECK(hash_code_ptr, JVMTI_ERROR_NULL_POINTER);
2835
2836 {
2837 jint result = (jint) mirror->identity_hash();
2838 *hash_code_ptr = result;
2839 }
2840 return JVMTI_ERROR_NONE;
2841 } /* end GetObjectHashCode */
2842
2843
2844 // info_ptr - pre-checked for NULL
2845 jvmtiError
2846 JvmtiEnv::GetObjectMonitorUsage(jobject object, jvmtiMonitorUsage* info_ptr) {
2847 JavaThread* calling_thread = JavaThread::current();
2848 jvmtiError err = get_object_monitor_usage(calling_thread, object, info_ptr);
2849 if (err == JVMTI_ERROR_THREAD_NOT_SUSPENDED) {
2850 // Some of the critical threads were not suspended. go to a safepoint and try again
2851 VM_GetObjectMonitorUsage op(this, calling_thread, object, info_ptr);
2852 VMThread::execute(&op);
2853 err = op.result();
2854 }
2855 return err;
2856 } /* end GetObjectMonitorUsage */
2857
2858
2859 //
2860 // Field functions
2861 //
2862
2863 // name_ptr - NULL is a valid value, must be checked
2864 // signature_ptr - NULL is a valid value, must be checked
2865 // generic_ptr - NULL is a valid value, must be checked
2866 jvmtiError
2867 JvmtiEnv::GetFieldName(fieldDescriptor* fdesc_ptr, char** name_ptr, char** signature_ptr, char** generic_ptr) {
2868 JavaThread* current_thread = JavaThread::current();
2869 ResourceMark rm(current_thread);
2870 if (name_ptr == NULL) {
2871 // just don't return the name
2872 } else {
2873 const char* fieldName = fdesc_ptr->name()->as_C_string();
2874 *name_ptr = (char*) jvmtiMalloc(strlen(fieldName) + 1);
2875 if (*name_ptr == NULL)
2876 return JVMTI_ERROR_OUT_OF_MEMORY;
2877 strcpy(*name_ptr, fieldName);
2878 }
2879 if (signature_ptr== NULL) {
2880 // just don't return the signature
2881 } else {
2882 const char* fieldSignature = fdesc_ptr->signature()->as_C_string();
2883 *signature_ptr = (char*) jvmtiMalloc(strlen(fieldSignature) + 1);
2884 if (*signature_ptr == NULL)
2885 return JVMTI_ERROR_OUT_OF_MEMORY;
2886 strcpy(*signature_ptr, fieldSignature);
2887 }
2888 if (generic_ptr != NULL) {
2889 *generic_ptr = NULL;
2890 Symbol* soop = fdesc_ptr->generic_signature();
2891 if (soop != NULL) {
2892 const char* gen_sig = soop->as_C_string();
2893 if (gen_sig != NULL) {
2894 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
2895 if (err != JVMTI_ERROR_NONE) {
2896 return err;
2897 }
2898 strcpy(*generic_ptr, gen_sig);
2899 }
2900 }
2901 }
2902 return JVMTI_ERROR_NONE;
2903 } /* end GetFieldName */
2904
2905
2906 // declaring_class_ptr - pre-checked for NULL
2907 jvmtiError
2908 JvmtiEnv::GetFieldDeclaringClass(fieldDescriptor* fdesc_ptr, jclass* declaring_class_ptr) {
2909
2910 *declaring_class_ptr = get_jni_class_non_null(fdesc_ptr->field_holder());
2911 return JVMTI_ERROR_NONE;
2912 } /* end GetFieldDeclaringClass */
2913
2914
2915 // modifiers_ptr - pre-checked for NULL
2916 jvmtiError
2917 JvmtiEnv::GetFieldModifiers(fieldDescriptor* fdesc_ptr, jint* modifiers_ptr) {
2918
2919 AccessFlags resultFlags = fdesc_ptr->access_flags();
2920 jint result = resultFlags.as_int();
2921 *modifiers_ptr = result;
2922
2923 return JVMTI_ERROR_NONE;
2924 } /* end GetFieldModifiers */
2925
2926
2927 // is_synthetic_ptr - pre-checked for NULL
2928 jvmtiError
2929 JvmtiEnv::IsFieldSynthetic(fieldDescriptor* fdesc_ptr, jboolean* is_synthetic_ptr) {
2930 *is_synthetic_ptr = fdesc_ptr->is_synthetic();
2931 return JVMTI_ERROR_NONE;
2932 } /* end IsFieldSynthetic */
2933
2934
2935 //
2936 // Method functions
2937 //
2938
2939 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2940 // name_ptr - NULL is a valid value, must be checked
2941 // signature_ptr - NULL is a valid value, must be checked
2942 // generic_ptr - NULL is a valid value, must be checked
2943 jvmtiError
2944 JvmtiEnv::GetMethodName(Method* method_oop, char** name_ptr, char** signature_ptr, char** generic_ptr) {
2945 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2946 JavaThread* current_thread = JavaThread::current();
2947
2948 ResourceMark rm(current_thread); // get the utf8 name and signature
2949 if (name_ptr == NULL) {
2950 // just don't return the name
2951 } else {
2952 const char* utf8_name = (const char *) method_oop->name()->as_utf8();
2953 *name_ptr = (char *) jvmtiMalloc(strlen(utf8_name)+1);
2954 strcpy(*name_ptr, utf8_name);
2955 }
2956 if (signature_ptr == NULL) {
2957 // just don't return the signature
2958 } else {
2959 const char* utf8_signature = (const char *) method_oop->signature()->as_utf8();
2960 *signature_ptr = (char *) jvmtiMalloc(strlen(utf8_signature) + 1);
2961 strcpy(*signature_ptr, utf8_signature);
2962 }
2963
2964 if (generic_ptr != NULL) {
2965 *generic_ptr = NULL;
2966 Symbol* soop = method_oop->generic_signature();
2967 if (soop != NULL) {
2968 const char* gen_sig = soop->as_C_string();
2969 if (gen_sig != NULL) {
2970 jvmtiError err = allocate(strlen(gen_sig) + 1, (unsigned char **)generic_ptr);
2971 if (err != JVMTI_ERROR_NONE) {
2972 return err;
2973 }
2974 strcpy(*generic_ptr, gen_sig);
2975 }
2976 }
2977 }
2978 return JVMTI_ERROR_NONE;
2979 } /* end GetMethodName */
2980
2981
2982 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2983 // declaring_class_ptr - pre-checked for NULL
2984 jvmtiError
2985 JvmtiEnv::GetMethodDeclaringClass(Method* method_oop, jclass* declaring_class_ptr) {
2986 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2987 (*declaring_class_ptr) = get_jni_class_non_null(method_oop->method_holder());
2988 return JVMTI_ERROR_NONE;
2989 } /* end GetMethodDeclaringClass */
2990
2991
2992 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
2993 // modifiers_ptr - pre-checked for NULL
2994 jvmtiError
2995 JvmtiEnv::GetMethodModifiers(Method* method_oop, jint* modifiers_ptr) {
2996 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
2997 (*modifiers_ptr) = method_oop->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2998 return JVMTI_ERROR_NONE;
2999 } /* end GetMethodModifiers */
3000
3001
3002 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3003 // max_ptr - pre-checked for NULL
3004 jvmtiError
3005 JvmtiEnv::GetMaxLocals(Method* method_oop, jint* max_ptr) {
3006 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3007 // get max stack
3008 (*max_ptr) = method_oop->max_locals();
3009 return JVMTI_ERROR_NONE;
3010 } /* end GetMaxLocals */
3011
3012
3013 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3014 // size_ptr - pre-checked for NULL
3015 jvmtiError
3016 JvmtiEnv::GetArgumentsSize(Method* method_oop, jint* size_ptr) {
3017 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3018 // get size of arguments
3019
3020 (*size_ptr) = method_oop->size_of_parameters();
3021 return JVMTI_ERROR_NONE;
3022 } /* end GetArgumentsSize */
3023
3024
3025 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3026 // entry_count_ptr - pre-checked for NULL
3027 // table_ptr - pre-checked for NULL
3028 jvmtiError
3029 JvmtiEnv::GetLineNumberTable(Method* method_oop, jint* entry_count_ptr, jvmtiLineNumberEntry** table_ptr) {
3030 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3031 if (!method_oop->has_linenumber_table()) {
3032 return (JVMTI_ERROR_ABSENT_INFORMATION);
3033 }
3034
3035 // The line number table is compressed so we don't know how big it is until decompressed.
3036 // Decompression is really fast so we just do it twice.
3037
3038 // Compute size of table
3039 jint num_entries = 0;
3040 CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table());
3041 while (stream.read_pair()) {
3042 num_entries++;
3043 }
3044 jvmtiLineNumberEntry *jvmti_table =
3045 (jvmtiLineNumberEntry *)jvmtiMalloc(num_entries * (sizeof(jvmtiLineNumberEntry)));
3046
3047 // Fill jvmti table
3048 if (num_entries > 0) {
3049 int index = 0;
3050 CompressedLineNumberReadStream stream(method_oop->compressed_linenumber_table());
3051 while (stream.read_pair()) {
3052 jvmti_table[index].start_location = (jlocation) stream.bci();
3053 jvmti_table[index].line_number = (jint) stream.line();
3054 index++;
3055 }
3056 assert(index == num_entries, "sanity check");
3057 }
3058
3059 // Set up results
3060 (*entry_count_ptr) = num_entries;
3061 (*table_ptr) = jvmti_table;
3062
3063 return JVMTI_ERROR_NONE;
3064 } /* end GetLineNumberTable */
3065
3066
3067 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3068 // start_location_ptr - pre-checked for NULL
3069 // end_location_ptr - pre-checked for NULL
3070 jvmtiError
3071 JvmtiEnv::GetMethodLocation(Method* method_oop, jlocation* start_location_ptr, jlocation* end_location_ptr) {
3072
3073 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3074 // get start and end location
3075 (*end_location_ptr) = (jlocation) (method_oop->code_size() - 1);
3076 if (method_oop->code_size() == 0) {
3077 // there is no code so there is no start location
3078 (*start_location_ptr) = (jlocation)(-1);
3079 } else {
3080 (*start_location_ptr) = (jlocation)(0);
3081 }
3082
3083 return JVMTI_ERROR_NONE;
3084 } /* end GetMethodLocation */
3085
3086
3087 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3088 // entry_count_ptr - pre-checked for NULL
3089 // table_ptr - pre-checked for NULL
3090 jvmtiError
3091 JvmtiEnv::GetLocalVariableTable(Method* method_oop, jint* entry_count_ptr, jvmtiLocalVariableEntry** table_ptr) {
3092
3093 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3094 JavaThread* current_thread = JavaThread::current();
3095
3096 // does the klass have any local variable information?
3097 InstanceKlass* ik = method_oop->method_holder();
3098 if (!ik->access_flags().has_localvariable_table()) {
3099 return (JVMTI_ERROR_ABSENT_INFORMATION);
3100 }
3101
3102 ConstantPool* constants = method_oop->constants();
3103 NULL_CHECK(constants, JVMTI_ERROR_ABSENT_INFORMATION);
3104
3105 // in the vm localvariable table representation, 6 consecutive elements in the table
3106 // represent a 6-tuple of shorts
3107 // [start_pc, length, name_index, descriptor_index, signature_index, index]
3108 jint num_entries = method_oop->localvariable_table_length();
3109 jvmtiLocalVariableEntry *jvmti_table = (jvmtiLocalVariableEntry *)
3110 jvmtiMalloc(num_entries * (sizeof(jvmtiLocalVariableEntry)));
3111
3112 if (num_entries > 0) {
3113 LocalVariableTableElement* table = method_oop->localvariable_table_start();
3114 for (int i = 0; i < num_entries; i++) {
3115 // get the 5 tuple information from the vm table
3116 jlocation start_location = (jlocation) table[i].start_bci;
3117 jint length = (jint) table[i].length;
3118 int name_index = (int) table[i].name_cp_index;
3119 int signature_index = (int) table[i].descriptor_cp_index;
3120 int generic_signature_index = (int) table[i].signature_cp_index;
3121 jint slot = (jint) table[i].slot;
3122
3123 // get utf8 name and signature
3124 char *name_buf = NULL;
3125 char *sig_buf = NULL;
3126 char *gen_sig_buf = NULL;
3127 {
3128 ResourceMark rm(current_thread);
3129
3130 const char *utf8_name = (const char *) constants->symbol_at(name_index)->as_utf8();
3131 name_buf = (char *) jvmtiMalloc(strlen(utf8_name)+1);
3132 strcpy(name_buf, utf8_name);
3133
3134 const char *utf8_signature = (const char *) constants->symbol_at(signature_index)->as_utf8();
3135 sig_buf = (char *) jvmtiMalloc(strlen(utf8_signature)+1);
3136 strcpy(sig_buf, utf8_signature);
3137
3138 if (generic_signature_index > 0) {
3139 const char *utf8_gen_sign = (const char *)
3140 constants->symbol_at(generic_signature_index)->as_utf8();
3141 gen_sig_buf = (char *) jvmtiMalloc(strlen(utf8_gen_sign)+1);
3142 strcpy(gen_sig_buf, utf8_gen_sign);
3143 }
3144 }
3145
3146 // fill in the jvmti local variable table
3147 jvmti_table[i].start_location = start_location;
3148 jvmti_table[i].length = length;
3149 jvmti_table[i].name = name_buf;
3150 jvmti_table[i].signature = sig_buf;
3151 jvmti_table[i].generic_signature = gen_sig_buf;
3152 jvmti_table[i].slot = slot;
3153 }
3154 }
3155
3156 // set results
3157 (*entry_count_ptr) = num_entries;
3158 (*table_ptr) = jvmti_table;
3159
3160 return JVMTI_ERROR_NONE;
3161 } /* end GetLocalVariableTable */
3162
3163
3164 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3165 // bytecode_count_ptr - pre-checked for NULL
3166 // bytecodes_ptr - pre-checked for NULL
3167 jvmtiError
3168 JvmtiEnv::GetBytecodes(Method* method_oop, jint* bytecode_count_ptr, unsigned char** bytecodes_ptr) {
3169 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3170
3171 HandleMark hm;
3172 methodHandle method(method_oop);
3173 jint size = (jint)method->code_size();
3174 jvmtiError err = allocate(size, bytecodes_ptr);
3175 if (err != JVMTI_ERROR_NONE) {
3176 return err;
3177 }
3178
3179 (*bytecode_count_ptr) = size;
3180 // get byte codes
3181 JvmtiClassFileReconstituter::copy_bytecodes(method, *bytecodes_ptr);
3182
3183 return JVMTI_ERROR_NONE;
3184 } /* end GetBytecodes */
3185
3186
3187 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3188 // is_native_ptr - pre-checked for NULL
3189 jvmtiError
3190 JvmtiEnv::IsMethodNative(Method* method_oop, jboolean* is_native_ptr) {
3191 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3192 (*is_native_ptr) = method_oop->is_native();
3193 return JVMTI_ERROR_NONE;
3194 } /* end IsMethodNative */
3195
3196
3197 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3198 // is_synthetic_ptr - pre-checked for NULL
3199 jvmtiError
3200 JvmtiEnv::IsMethodSynthetic(Method* method_oop, jboolean* is_synthetic_ptr) {
3201 NULL_CHECK(method_oop, JVMTI_ERROR_INVALID_METHODID);
3202 (*is_synthetic_ptr) = method_oop->is_synthetic();
3203 return JVMTI_ERROR_NONE;
3204 } /* end IsMethodSynthetic */
3205
3206
3207 // method_oop - pre-checked for validity, but may be NULL meaning obsolete method
3208 // is_obsolete_ptr - pre-checked for NULL
3209 jvmtiError
3210 JvmtiEnv::IsMethodObsolete(Method* method_oop, jboolean* is_obsolete_ptr) {
3211 if (use_version_1_0_semantics() &&
3212 get_capabilities()->can_redefine_classes == 0) {
3213 // This JvmtiEnv requested version 1.0 semantics and this function
3214 // requires the can_redefine_classes capability in version 1.0 so
3215 // we need to return an error here.
3216 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3217 }
3218
3219 if (method_oop == NULL || method_oop->is_obsolete()) {
3220 *is_obsolete_ptr = true;
3221 } else {
3222 *is_obsolete_ptr = false;
3223 }
3224 return JVMTI_ERROR_NONE;
3225 } /* end IsMethodObsolete */
3226
3227 //
3228 // Raw Monitor functions
3229 //
3230
3231 // name - pre-checked for NULL
3232 // monitor_ptr - pre-checked for NULL
3233 jvmtiError
3234 JvmtiEnv::CreateRawMonitor(const char* name, jrawMonitorID* monitor_ptr) {
3235 JvmtiRawMonitor* rmonitor = new JvmtiRawMonitor(name);
3236 NULL_CHECK(rmonitor, JVMTI_ERROR_OUT_OF_MEMORY);
3237
3238 *monitor_ptr = (jrawMonitorID)rmonitor;
3239
3240 return JVMTI_ERROR_NONE;
3241 } /* end CreateRawMonitor */
3242
3243
3244 // rmonitor - pre-checked for validity
3245 jvmtiError
3246 JvmtiEnv::DestroyRawMonitor(JvmtiRawMonitor * rmonitor) {
3247 if (Threads::number_of_threads() == 0) {
3248 // Remove this monitor from pending raw monitors list
3249 // if it has entered in onload or start phase.
3250 JvmtiPendingMonitors::destroy(rmonitor);
3251 } else {
3252 Thread* thread = Thread::current();
3253 if (rmonitor->is_entered(thread)) {
3254 // The caller owns this monitor which we are about to destroy.
3255 // We exit the underlying synchronization object so that the
3256 // "delete monitor" call below can work without an assertion
3257 // failure on systems that don't like destroying synchronization
3258 // objects that are locked.
3259 int r;
3260 intptr_t recursion = rmonitor->recursions();
3261 for (intptr_t i=0; i <= recursion; i++) {
3262 r = rmonitor->raw_exit(thread);
3263 assert(r == ObjectMonitor::OM_OK, "raw_exit should have worked");
3264 if (r != ObjectMonitor::OM_OK) { // robustness
3265 return JVMTI_ERROR_INTERNAL;
3266 }
3267 }
3268 }
3269 if (rmonitor->owner() != NULL) {
3270 // The caller is trying to destroy a monitor that is locked by
3271 // someone else. While this is not forbidden by the JVMTI
3272 // spec, it will cause an assertion failure on systems that don't
3273 // like destroying synchronization objects that are locked.
3274 // We indicate a problem with the error return (and leak the
3275 // monitor's memory).
3276 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3277 }
3278 }
3279
3280 delete rmonitor;
3281
3282 return JVMTI_ERROR_NONE;
3283 } /* end DestroyRawMonitor */
3284
3285
3286 // rmonitor - pre-checked for validity
3287 jvmtiError
3288 JvmtiEnv::RawMonitorEnter(JvmtiRawMonitor * rmonitor) {
3289 if (Threads::number_of_threads() == 0) {
3290 // No JavaThreads exist so ObjectMonitor enter cannot be
3291 // used, add this raw monitor to the pending list.
3292 // The pending monitors will be actually entered when
3293 // the VM is setup.
3294 // See transition_pending_raw_monitors in create_vm()
3295 // in thread.cpp.
3296 JvmtiPendingMonitors::enter(rmonitor);
3297 } else {
3298 int r = 0;
3299 Thread* thread = Thread::current();
3300
3301 if (thread->is_Java_thread()) {
3302 JavaThread* current_thread = (JavaThread*)thread;
3303
3304 #ifdef PROPER_TRANSITIONS
3305 // Not really unknown but ThreadInVMfromNative does more than we want
3306 ThreadInVMfromUnknown __tiv;
3307 {
3308 ThreadBlockInVM __tbivm(current_thread);
3309 r = rmonitor->raw_enter(current_thread);
3310 }
3311 #else
3312 /* Transition to thread_blocked without entering vm state */
3313 /* This is really evil. Normally you can't undo _thread_blocked */
3314 /* transitions like this because it would cause us to miss a */
3315 /* safepoint but since the thread was already in _thread_in_native */
3316 /* the thread is not leaving a safepoint safe state and it will */
3317 /* block when it tries to return from native. We can't safepoint */
3318 /* block in here because we could deadlock the vmthread. Blech. */
3319
3320 JavaThreadState state = current_thread->thread_state();
3321 assert(state == _thread_in_native, "Must be _thread_in_native");
3322 // frame should already be walkable since we are in native
3323 assert(!current_thread->has_last_Java_frame() ||
3324 current_thread->frame_anchor()->walkable(), "Must be walkable");
3325 current_thread->set_thread_state(_thread_blocked);
3326
3327 r = rmonitor->raw_enter(current_thread);
3328 // restore state, still at a safepoint safe state
3329 current_thread->set_thread_state(state);
3330
3331 #endif /* PROPER_TRANSITIONS */
3332 assert(r == ObjectMonitor::OM_OK, "raw_enter should have worked");
3333 } else {
3334 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3335 r = rmonitor->raw_enter(thread);
3336 } else {
3337 ShouldNotReachHere();
3338 }
3339 }
3340
3341 if (r != ObjectMonitor::OM_OK) { // robustness
3342 return JVMTI_ERROR_INTERNAL;
3343 }
3344 }
3345 return JVMTI_ERROR_NONE;
3346 } /* end RawMonitorEnter */
3347
3348
3349 // rmonitor - pre-checked for validity
3350 jvmtiError
3351 JvmtiEnv::RawMonitorExit(JvmtiRawMonitor * rmonitor) {
3352 jvmtiError err = JVMTI_ERROR_NONE;
3353
3354 if (Threads::number_of_threads() == 0) {
3355 // No JavaThreads exist so just remove this monitor from the pending list.
3356 // Bool value from exit is false if rmonitor is not in the list.
3357 if (!JvmtiPendingMonitors::exit(rmonitor)) {
3358 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3359 }
3360 } else {
3361 int r = 0;
3362 Thread* thread = Thread::current();
3363
3364 if (thread->is_Java_thread()) {
3365 JavaThread* current_thread = (JavaThread*)thread;
3366 #ifdef PROPER_TRANSITIONS
3367 // Not really unknown but ThreadInVMfromNative does more than we want
3368 ThreadInVMfromUnknown __tiv;
3369 #endif /* PROPER_TRANSITIONS */
3370 r = rmonitor->raw_exit(current_thread);
3371 } else {
3372 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3373 r = rmonitor->raw_exit(thread);
3374 } else {
3375 ShouldNotReachHere();
3376 }
3377 }
3378
3379 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) {
3380 err = JVMTI_ERROR_NOT_MONITOR_OWNER;
3381 } else {
3382 assert(r == ObjectMonitor::OM_OK, "raw_exit should have worked");
3383 if (r != ObjectMonitor::OM_OK) { // robustness
3384 err = JVMTI_ERROR_INTERNAL;
3385 }
3386 }
3387 }
3388 return err;
3389 } /* end RawMonitorExit */
3390
3391
3392 // rmonitor - pre-checked for validity
3393 jvmtiError
3394 JvmtiEnv::RawMonitorWait(JvmtiRawMonitor * rmonitor, jlong millis) {
3395 int r = 0;
3396 Thread* thread = Thread::current();
3397
3398 if (thread->is_Java_thread()) {
3399 JavaThread* current_thread = (JavaThread*)thread;
3400 #ifdef PROPER_TRANSITIONS
3401 // Not really unknown but ThreadInVMfromNative does more than we want
3402 ThreadInVMfromUnknown __tiv;
3403 {
3404 ThreadBlockInVM __tbivm(current_thread);
3405 r = rmonitor->raw_wait(millis, true, current_thread);
3406 }
3407 #else
3408 /* Transition to thread_blocked without entering vm state */
3409 /* This is really evil. Normally you can't undo _thread_blocked */
3410 /* transitions like this because it would cause us to miss a */
3411 /* safepoint but since the thread was already in _thread_in_native */
3412 /* the thread is not leaving a safepoint safe state and it will */
3413 /* block when it tries to return from native. We can't safepoint */
3414 /* block in here because we could deadlock the vmthread. Blech. */
3415
3416 JavaThreadState state = current_thread->thread_state();
3417 assert(state == _thread_in_native, "Must be _thread_in_native");
3418 // frame should already be walkable since we are in native
3419 assert(!current_thread->has_last_Java_frame() ||
3420 current_thread->frame_anchor()->walkable(), "Must be walkable");
3421 current_thread->set_thread_state(_thread_blocked);
3422
3423 r = rmonitor->raw_wait(millis, true, current_thread);
3424 // restore state, still at a safepoint safe state
3425 current_thread->set_thread_state(state);
3426
3427 #endif /* PROPER_TRANSITIONS */
3428 } else {
3429 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3430 r = rmonitor->raw_wait(millis, true, thread);
3431 } else {
3432 ShouldNotReachHere();
3433 }
3434 }
3435
3436 switch (r) {
3437 case ObjectMonitor::OM_INTERRUPTED:
3438 return JVMTI_ERROR_INTERRUPT;
3439 case ObjectMonitor::OM_ILLEGAL_MONITOR_STATE:
3440 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3441 }
3442 assert(r == ObjectMonitor::OM_OK, "raw_wait should have worked");
3443 if (r != ObjectMonitor::OM_OK) { // robustness
3444 return JVMTI_ERROR_INTERNAL;
3445 }
3446
3447 return JVMTI_ERROR_NONE;
3448 } /* end RawMonitorWait */
3449
3450
3451 // rmonitor - pre-checked for validity
3452 jvmtiError
3453 JvmtiEnv::RawMonitorNotify(JvmtiRawMonitor * rmonitor) {
3454 int r = 0;
3455 Thread* thread = Thread::current();
3456
3457 if (thread->is_Java_thread()) {
3458 JavaThread* current_thread = (JavaThread*)thread;
3459 // Not really unknown but ThreadInVMfromNative does more than we want
3460 ThreadInVMfromUnknown __tiv;
3461 r = rmonitor->raw_notify(current_thread);
3462 } else {
3463 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3464 r = rmonitor->raw_notify(thread);
3465 } else {
3466 ShouldNotReachHere();
3467 }
3468 }
3469
3470 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) {
3471 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3472 }
3473 assert(r == ObjectMonitor::OM_OK, "raw_notify should have worked");
3474 if (r != ObjectMonitor::OM_OK) { // robustness
3475 return JVMTI_ERROR_INTERNAL;
3476 }
3477
3478 return JVMTI_ERROR_NONE;
3479 } /* end RawMonitorNotify */
3480
3481
3482 // rmonitor - pre-checked for validity
3483 jvmtiError
3484 JvmtiEnv::RawMonitorNotifyAll(JvmtiRawMonitor * rmonitor) {
3485 int r = 0;
3486 Thread* thread = Thread::current();
3487
3488 if (thread->is_Java_thread()) {
3489 JavaThread* current_thread = (JavaThread*)thread;
3490 ThreadInVMfromUnknown __tiv;
3491 r = rmonitor->raw_notifyAll(current_thread);
3492 } else {
3493 if (thread->is_VM_thread() || thread->is_ConcurrentGC_thread()) {
3494 r = rmonitor->raw_notifyAll(thread);
3495 } else {
3496 ShouldNotReachHere();
3497 }
3498 }
3499
3500 if (r == ObjectMonitor::OM_ILLEGAL_MONITOR_STATE) {
3501 return JVMTI_ERROR_NOT_MONITOR_OWNER;
3502 }
3503 assert(r == ObjectMonitor::OM_OK, "raw_notifyAll should have worked");
3504 if (r != ObjectMonitor::OM_OK) { // robustness
3505 return JVMTI_ERROR_INTERNAL;
3506 }
3507
3508 return JVMTI_ERROR_NONE;
3509 } /* end RawMonitorNotifyAll */
3510
3511
3512 //
3513 // JNI Function Interception functions
3514 //
3515
3516
3517 // function_table - pre-checked for NULL
3518 jvmtiError
3519 JvmtiEnv::SetJNIFunctionTable(const jniNativeInterface* function_table) {
3520 // Copy jni function table at safepoint.
3521 VM_JNIFunctionTableCopier copier(function_table);
3522 VMThread::execute(&copier);
3523
3524 return JVMTI_ERROR_NONE;
3525 } /* end SetJNIFunctionTable */
3526
3527
3528 // function_table - pre-checked for NULL
3529 jvmtiError
3530 JvmtiEnv::GetJNIFunctionTable(jniNativeInterface** function_table) {
3531 *function_table=(jniNativeInterface*)jvmtiMalloc(sizeof(jniNativeInterface));
3532 if (*function_table == NULL)
3533 return JVMTI_ERROR_OUT_OF_MEMORY;
3534 memcpy(*function_table,(JavaThread::current())->get_jni_functions(),sizeof(jniNativeInterface));
3535 return JVMTI_ERROR_NONE;
3536 } /* end GetJNIFunctionTable */
3537
3538
3539 //
3540 // Event Management functions
3541 //
3542
3543 jvmtiError
3544 JvmtiEnv::GenerateEvents(jvmtiEvent event_type) {
3545 // can only generate two event types
3546 if (event_type != JVMTI_EVENT_COMPILED_METHOD_LOAD &&
3547 event_type != JVMTI_EVENT_DYNAMIC_CODE_GENERATED) {
3548 return JVMTI_ERROR_ILLEGAL_ARGUMENT;
3549 }
3550
3551 // for compiled_method_load events we must check that the environment
3552 // has the can_generate_compiled_method_load_events capability.
3553 if (event_type == JVMTI_EVENT_COMPILED_METHOD_LOAD) {
3554 if (get_capabilities()->can_generate_compiled_method_load_events == 0) {
3555 return JVMTI_ERROR_MUST_POSSESS_CAPABILITY;
3556 }
3557 return JvmtiCodeBlobEvents::generate_compiled_method_load_events(this);
3558 } else {
3559 return JvmtiCodeBlobEvents::generate_dynamic_code_events(this);
3560 }
3561
3562 } /* end GenerateEvents */
3563
3564
3565 //
3566 // Extension Mechanism functions
3567 //
3568
3569 // extension_count_ptr - pre-checked for NULL
3570 // extensions - pre-checked for NULL
3571 jvmtiError
3572 JvmtiEnv::GetExtensionFunctions(jint* extension_count_ptr, jvmtiExtensionFunctionInfo** extensions) {
3573 return JvmtiExtensions::get_functions(this, extension_count_ptr, extensions);
3574 } /* end GetExtensionFunctions */
3575
3576
3577 // extension_count_ptr - pre-checked for NULL
3578 // extensions - pre-checked for NULL
3579 jvmtiError
3580 JvmtiEnv::GetExtensionEvents(jint* extension_count_ptr, jvmtiExtensionEventInfo** extensions) {
3581 return JvmtiExtensions::get_events(this, extension_count_ptr, extensions);
3582 } /* end GetExtensionEvents */
3583
3584
3585 // callback - NULL is a valid value, must be checked
3586 jvmtiError
3587 JvmtiEnv::SetExtensionEventCallback(jint extension_event_index, jvmtiExtensionEvent callback) {
3588 return JvmtiExtensions::set_event_callback(this, extension_event_index, callback);
3589 } /* end SetExtensionEventCallback */
3590
3591 //
3592 // Timers functions
3593 //
3594
3595 // info_ptr - pre-checked for NULL
3596 jvmtiError
3597 JvmtiEnv::GetCurrentThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3598 os::current_thread_cpu_time_info(info_ptr);
3599 return JVMTI_ERROR_NONE;
3600 } /* end GetCurrentThreadCpuTimerInfo */
3601
3602
3603 // nanos_ptr - pre-checked for NULL
3604 jvmtiError
3605 JvmtiEnv::GetCurrentThreadCpuTime(jlong* nanos_ptr) {
3606 *nanos_ptr = os::current_thread_cpu_time();
3607 return JVMTI_ERROR_NONE;
3608 } /* end GetCurrentThreadCpuTime */
3609
3610
3611 // info_ptr - pre-checked for NULL
3612 jvmtiError
3613 JvmtiEnv::GetThreadCpuTimerInfo(jvmtiTimerInfo* info_ptr) {
3614 os::thread_cpu_time_info(info_ptr);
3615 return JVMTI_ERROR_NONE;
3616 } /* end GetThreadCpuTimerInfo */
3617
3618
3619 // Threads_lock NOT held, java_thread not protected by lock
3620 // java_thread - pre-checked
3621 // nanos_ptr - pre-checked for NULL
3622 jvmtiError
3623 JvmtiEnv::GetThreadCpuTime(JavaThread* java_thread, jlong* nanos_ptr) {
3624 *nanos_ptr = os::thread_cpu_time(java_thread);
3625 return JVMTI_ERROR_NONE;
3626 } /* end GetThreadCpuTime */
3627
3628
3629 // info_ptr - pre-checked for NULL
3630 jvmtiError
3631 JvmtiEnv::GetTimerInfo(jvmtiTimerInfo* info_ptr) {
3632 os::javaTimeNanos_info(info_ptr);
3633 return JVMTI_ERROR_NONE;
3634 } /* end GetTimerInfo */
3635
3636
3637 // nanos_ptr - pre-checked for NULL
3638 jvmtiError
3639 JvmtiEnv::GetTime(jlong* nanos_ptr) {
3640 *nanos_ptr = os::javaTimeNanos();
3641 return JVMTI_ERROR_NONE;
3642 } /* end GetTime */
3643
3644
3645 // processor_count_ptr - pre-checked for NULL
3646 jvmtiError
3647 JvmtiEnv::GetAvailableProcessors(jint* processor_count_ptr) {
3648 *processor_count_ptr = os::active_processor_count();
3649 return JVMTI_ERROR_NONE;
3650 } /* end GetAvailableProcessors */
3651
3652 //
3653 // System Properties functions
3654 //
3655
3656 // count_ptr - pre-checked for NULL
3657 // property_ptr - pre-checked for NULL
3658 jvmtiError
3659 JvmtiEnv::GetSystemProperties(jint* count_ptr, char*** property_ptr) {
3660 jvmtiError err = JVMTI_ERROR_NONE;
3661
3662 // Get the number of readable properties.
3663 *count_ptr = Arguments::PropertyList_readable_count(Arguments::system_properties());
3664
3665 // Allocate memory to hold the exact number of readable properties.
3666 err = allocate(*count_ptr * sizeof(char *), (unsigned char **)property_ptr);
3667 if (err != JVMTI_ERROR_NONE) {
3668 return err;
3669 }
3670 int readable_count = 0;
3671 // Loop through the system properties until all the readable properties are found.
3672 for (SystemProperty* p = Arguments::system_properties(); p != NULL && readable_count < *count_ptr; p = p->next()) {
3673 if (p->is_readable()) {
3674 const char *key = p->key();
3675 char **tmp_value = *property_ptr+readable_count;
3676 readable_count++;
3677 err = allocate((strlen(key)+1) * sizeof(char), (unsigned char**)tmp_value);
3678 if (err == JVMTI_ERROR_NONE) {
3679 strcpy(*tmp_value, key);
3680 } else {
3681 // clean up previously allocated memory.
3682 for (int j=0; j<readable_count; j++) {
3683 Deallocate((unsigned char*)*property_ptr+j);
3684 }
3685 Deallocate((unsigned char*)property_ptr);
3686 break;
3687 }
3688 }
3689 }
3690 assert(err != JVMTI_ERROR_NONE || readable_count == *count_ptr, "Bad readable property count");
3691 return err;
3692 } /* end GetSystemProperties */
3693
3694
3695 // property - pre-checked for NULL
3696 // value_ptr - pre-checked for NULL
3697 jvmtiError
3698 JvmtiEnv::GetSystemProperty(const char* property, char** value_ptr) {
3699 jvmtiError err = JVMTI_ERROR_NONE;
3700 const char *value;
3701
3702 // Return JVMTI_ERROR_NOT_AVAILABLE if property is not readable or doesn't exist.
3703 value = Arguments::PropertyList_get_readable_value(Arguments::system_properties(), property);
3704 if (value == NULL) {
3705 err = JVMTI_ERROR_NOT_AVAILABLE;
3706 } else {
3707 err = allocate((strlen(value)+1) * sizeof(char), (unsigned char **)value_ptr);
3708 if (err == JVMTI_ERROR_NONE) {
3709 strcpy(*value_ptr, value);
3710 }
3711 }
3712 return err;
3713 } /* end GetSystemProperty */
3714
3715
3716 // property - pre-checked for NULL
3717 // value - NULL is a valid value, must be checked
3718 jvmtiError
3719 JvmtiEnv::SetSystemProperty(const char* property, const char* value_ptr) {
3720 jvmtiError err =JVMTI_ERROR_NOT_AVAILABLE;
3721
3722 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
3723 if (strcmp(property, p->key()) == 0) {
3724 if (p->set_writeable_value(value_ptr)) {
3725 err = JVMTI_ERROR_NONE;
3726 }
3727 }
3728 }
3729 return err;
3730 } /* end SetSystemProperty */