1 /*
2 * Copyright (c) 1997, 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/classFileStream.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.inline.hpp"
29 #include "classfile/javaAssertions.hpp"
30 #include "classfile/javaClasses.inline.hpp"
31 #include "classfile/moduleEntry.hpp"
32 #include "classfile/modules.hpp"
33 #include "classfile/packageEntry.hpp"
34 #include "classfile/stringTable.hpp"
35 #include "classfile/systemDictionary.hpp"
36 #include "classfile/vmSymbols.hpp"
37 #include "gc/shared/barrierSet.inline.hpp"
38 #include "gc/shared/collectedHeap.inline.hpp"
39 #include "interpreter/bytecode.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "memory/resourceArea.hpp"
42 #include "memory/universe.inline.hpp"
43 #include "oops/fieldStreams.hpp"
44 #include "oops/instanceKlass.hpp"
45 #include "oops/method.hpp"
46 #include "oops/objArrayKlass.hpp"
47 #include "oops/objArrayOop.inline.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "prims/jvm.h"
50 #include "prims/jvm_misc.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "prims/jvmtiThreadState.hpp"
53 #include "prims/nativeLookup.hpp"
54 #include "prims/privilegedStack.hpp"
55 #include "prims/stackwalk.hpp"
56 #include "runtime/arguments.hpp"
57 #include "runtime/atomic.hpp"
58 #include "runtime/handles.inline.hpp"
59 #include "runtime/init.hpp"
60 #include "runtime/interfaceSupport.hpp"
61 #include "runtime/java.hpp"
62 #include "runtime/javaCalls.hpp"
63 #include "runtime/jfieldIDWorkaround.hpp"
64 #include "runtime/orderAccess.inline.hpp"
65 #include "runtime/os.inline.hpp"
66 #include "runtime/perfData.hpp"
67 #include "runtime/reflection.hpp"
68 #include "runtime/thread.inline.hpp"
69 #include "runtime/threadSMR.hpp"
70 #include "runtime/vframe.hpp"
71 #include "runtime/vm_operations.hpp"
72 #include "runtime/vm_version.hpp"
73 #include "services/attachListener.hpp"
74 #include "services/management.hpp"
75 #include "services/threadService.hpp"
76 #include "trace/tracing.hpp"
77 #include "utilities/copy.hpp"
78 #include "utilities/defaultStream.hpp"
79 #include "utilities/dtrace.hpp"
80 #include "utilities/events.hpp"
81 #include "utilities/histogram.hpp"
82 #include "utilities/macros.hpp"
83 #include "utilities/utf8.hpp"
84 #if INCLUDE_CDS
85 #include "classfile/sharedClassUtil.hpp"
86 #include "classfile/systemDictionaryShared.hpp"
87 #endif
88
89 #include <errno.h>
90
91 /*
92 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
93 such ctors and calls MUST NOT come between an oop declaration/init and its
94 usage because if objects are move this may cause various memory stomps, bus
95 errors and segfaults. Here is a cookbook for causing so called "naked oop
96 failures":
97
98 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
99 JVMWrapper("JVM_GetClassDeclaredFields");
100
101 // Object address to be held directly in mirror & not visible to GC
102 oop mirror = JNIHandles::resolve_non_null(ofClass);
103
104 // If this ctor can hit a safepoint, moving objects around, then
105 ComplexConstructor foo;
106
107 // Boom! mirror may point to JUNK instead of the intended object
108 (some dereference of mirror)
109
110 // Here's another call that may block for GC, making mirror stale
111 MutexLocker ml(some_lock);
112
113 // And here's an initializer that can result in a stale oop
114 // all in one step.
115 oop o = call_that_can_throw_exception(TRAPS);
116
117
118 The solution is to keep the oop declaration BELOW the ctor or function
119 call that might cause a GC, do another resolve to reassign the oop, or
120 consider use of a Handle instead of an oop so there is immunity from object
121 motion. But note that the "QUICK" entries below do not have a handlemark
122 and thus can only support use of handles passed in.
123 */
124
125 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
126 ResourceMark rm;
127 int line_number = -1;
128 const char * source_file = NULL;
129 const char * trace = "explicit";
130 InstanceKlass* caller = NULL;
131 JavaThread* jthread = JavaThread::current();
132 if (jthread->has_last_Java_frame()) {
133 vframeStream vfst(jthread);
134
135 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
136 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
137 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
138 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
139 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
140
141 Method* last_caller = NULL;
142
143 while (!vfst.at_end()) {
144 Method* m = vfst.method();
145 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
146 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
147 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
148 break;
149 }
150 last_caller = m;
151 vfst.next();
152 }
153 // if this is called from Class.forName0 and that is called from Class.forName,
154 // then print the caller of Class.forName. If this is Class.loadClass, then print
155 // that caller, otherwise keep quiet since this should be picked up elsewhere.
156 bool found_it = false;
157 if (!vfst.at_end() &&
158 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
159 vfst.method()->name() == vmSymbols::forName0_name()) {
160 vfst.next();
161 if (!vfst.at_end() &&
162 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
163 vfst.method()->name() == vmSymbols::forName_name()) {
164 vfst.next();
165 found_it = true;
166 }
167 } else if (last_caller != NULL &&
168 last_caller->method_holder()->name() ==
169 vmSymbols::java_lang_ClassLoader() &&
170 (last_caller->name() == vmSymbols::loadClassInternal_name() ||
171 last_caller->name() == vmSymbols::loadClass_name())) {
172 found_it = true;
173 } else if (!vfst.at_end()) {
174 if (vfst.method()->is_native()) {
175 // JNI call
176 found_it = true;
177 }
178 }
179 if (found_it && !vfst.at_end()) {
180 // found the caller
181 caller = vfst.method()->method_holder();
182 line_number = vfst.method()->line_number_from_bci(vfst.bci());
183 if (line_number == -1) {
184 // show method name if it's a native method
185 trace = vfst.method()->name_and_sig_as_C_string();
186 }
187 Symbol* s = caller->source_file_name();
188 if (s != NULL) {
189 source_file = s->as_C_string();
190 }
191 }
192 }
193 if (caller != NULL) {
194 if (to_class != caller) {
195 const char * from = caller->external_name();
196 const char * to = to_class->external_name();
197 // print in a single call to reduce interleaving between threads
198 if (source_file != NULL) {
199 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
200 } else {
201 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
202 }
203 }
204 }
205 }
206
207 void trace_class_resolution(Klass* to_class) {
208 EXCEPTION_MARK;
209 trace_class_resolution_impl(to_class, THREAD);
210 if (HAS_PENDING_EXCEPTION) {
211 CLEAR_PENDING_EXCEPTION;
212 }
213 }
214
215 // Wrapper to trace JVM functions
216
217 #ifdef ASSERT
218 Histogram* JVMHistogram;
219 volatile jint JVMHistogram_lock = 0;
220
221 class JVMHistogramElement : public HistogramElement {
222 public:
223 JVMHistogramElement(const char* name);
224 };
225
226 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
227 _name = elementName;
228 uintx count = 0;
229
230 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
231 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
232 count +=1;
233 if ( (WarnOnStalledSpinLock > 0)
234 && (count % WarnOnStalledSpinLock == 0)) {
235 warning("JVMHistogram_lock seems to be stalled");
236 }
237 }
238 }
239
240 if(JVMHistogram == NULL)
241 JVMHistogram = new Histogram("JVM Call Counts",100);
242
243 JVMHistogram->add_element(this);
244 Atomic::dec(&JVMHistogram_lock);
245 }
246
247 #define JVMCountWrapper(arg) \
248 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
249 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
250
251 #define JVMWrapper(arg) JVMCountWrapper(arg);
252 #else
253 #define JVMWrapper(arg)
254 #endif
255
256
257 // Interface version /////////////////////////////////////////////////////////////////////
258
259
260 JVM_LEAF(jint, JVM_GetInterfaceVersion())
261 return JVM_INTERFACE_VERSION;
262 JVM_END
263
264
265 // java.lang.System //////////////////////////////////////////////////////////////////////
266
267
268 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
269 JVMWrapper("JVM_CurrentTimeMillis");
270 return os::javaTimeMillis();
271 JVM_END
272
273 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
274 JVMWrapper("JVM_NanoTime");
275 return os::javaTimeNanos();
276 JVM_END
277
278 // The function below is actually exposed by jdk.internal.misc.VM and not
279 // java.lang.System, but we choose to keep it here so that it stays next
280 // to JVM_CurrentTimeMillis and JVM_NanoTime
281
282 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
283 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
284
285 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
286 JVMWrapper("JVM_GetNanoTimeAdjustment");
287 jlong seconds;
288 jlong nanos;
289
290 os::javaTimeSystemUTC(seconds, nanos);
291
292 // We're going to verify that the result can fit in a long.
293 // For that we need the difference in seconds between 'seconds'
294 // and 'offset_secs' to be such that:
295 // |seconds - offset_secs| < (2^63/10^9)
296 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
297 // which makes |seconds - offset_secs| < 2^33
298 // and we will prefer +/- 2^32 as the maximum acceptable diff
299 // as 2^32 has a more natural feel than 2^33...
300 //
301 // So if |seconds - offset_secs| >= 2^32 - we return a special
302 // sentinel value (-1) which the caller should take as an
303 // exception value indicating that the offset given to us is
304 // too far from range of the current time - leading to too big
305 // a nano adjustment. The caller is expected to recover by
306 // computing a more accurate offset and calling this method
307 // again. (For the record 2^32 secs is ~136 years, so that
308 // should rarely happen)
309 //
310 jlong diff = seconds - offset_secs;
311 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
312 return -1; // sentinel value: the offset is too far off the target
313 }
314
315 // return the adjustment. If you compute a time by adding
316 // this number of nanoseconds along with the number of seconds
317 // in the offset you should get the current UTC time.
318 return (diff * (jlong)1000000000) + nanos;
319 JVM_END
320
321 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
322 jobject dst, jint dst_pos, jint length))
323 JVMWrapper("JVM_ArrayCopy");
324 // Check if we have null pointers
325 if (src == NULL || dst == NULL) {
326 THROW(vmSymbols::java_lang_NullPointerException());
327 }
328 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
329 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
330 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
331 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
332 // Do copy
333 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
334 JVM_END
335
336
337 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
338 JavaValue r(T_OBJECT);
339 // public synchronized Object put(Object key, Object value);
340 HandleMark hm(THREAD);
341 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
342 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
343 JavaCalls::call_virtual(&r,
344 props,
345 SystemDictionary::Properties_klass(),
346 vmSymbols::put_name(),
347 vmSymbols::object_object_object_signature(),
348 key_str,
349 value_str,
350 THREAD);
351 }
352
353
354 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
355
356
357 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
358 JVMWrapper("JVM_InitProperties");
359 ResourceMark rm;
360
361 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
362
363 // System property list includes both user set via -D option and
364 // jvm system specific properties.
365 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
366 PUTPROP(props, p->key(), p->value());
367 }
368
369 // Convert the -XX:MaxDirectMemorySize= command line flag
370 // to the sun.nio.MaxDirectMemorySize property.
371 // Do this after setting user properties to prevent people
372 // from setting the value with a -D option, as requested.
373 {
374 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
375 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
376 } else {
377 char as_chars[256];
378 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
379 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
380 }
381 }
382
383 // JVM monitoring and management support
384 // Add the sun.management.compiler property for the compiler's name
385 {
386 #undef CSIZE
387 #if defined(_LP64) || defined(_WIN64)
388 #define CSIZE "64-Bit "
389 #else
390 #define CSIZE
391 #endif // 64bit
392
393 #ifdef TIERED
394 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
395 #else
396 #if defined(COMPILER1)
397 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
398 #elif defined(COMPILER2)
399 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
400 #elif INCLUDE_JVMCI
401 #error "INCLUDE_JVMCI should imply TIERED"
402 #else
403 const char* compiler_name = "";
404 #endif // compilers
405 #endif // TIERED
406
407 if (*compiler_name != '\0' &&
408 (Arguments::mode() != Arguments::_int)) {
409 PUTPROP(props, "sun.management.compiler", compiler_name);
410 }
411 }
412
413 return properties;
414 JVM_END
415
416
417 /*
418 * Return the temporary directory that the VM uses for the attach
419 * and perf data files.
420 *
421 * It is important that this directory is well-known and the
422 * same for all VM instances. It cannot be affected by configuration
423 * variables such as java.io.tmpdir.
424 */
425 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
426 JVMWrapper("JVM_GetTemporaryDirectory");
427 HandleMark hm(THREAD);
428 const char* temp_dir = os::get_temp_directory();
429 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
430 return (jstring) JNIHandles::make_local(env, h());
431 JVM_END
432
433
434 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
435
436 extern volatile jint vm_created;
437
438 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
439 before_exit(thread);
440 vm_exit(code);
441 JVM_END
442
443
444 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
445 JVMWrapper("JVM_GC");
446 if (!DisableExplicitGC) {
447 Universe::heap()->collect(GCCause::_java_lang_system_gc);
448 }
449 JVM_END
450
451
452 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
453 JVMWrapper("JVM_MaxObjectInspectionAge");
454 return Universe::heap()->millis_since_last_gc();
455 JVM_END
456
457
458 static inline jlong convert_size_t_to_jlong(size_t val) {
459 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
460 NOT_LP64 (return (jlong)val;)
461 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
462 }
463
464 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
465 JVMWrapper("JVM_TotalMemory");
466 size_t n = Universe::heap()->capacity();
467 return convert_size_t_to_jlong(n);
468 JVM_END
469
470
471 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
472 JVMWrapper("JVM_FreeMemory");
473 CollectedHeap* ch = Universe::heap();
474 size_t n;
475 {
476 MutexLocker x(Heap_lock);
477 n = ch->capacity() - ch->used();
478 }
479 return convert_size_t_to_jlong(n);
480 JVM_END
481
482
483 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
484 JVMWrapper("JVM_MaxMemory");
485 size_t n = Universe::heap()->max_capacity();
486 return convert_size_t_to_jlong(n);
487 JVM_END
488
489
490 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
491 JVMWrapper("JVM_ActiveProcessorCount");
492 return os::active_processor_count();
493 JVM_END
494
495
496
497 // java.lang.Throwable //////////////////////////////////////////////////////
498
499
500 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
501 JVMWrapper("JVM_FillInStackTrace");
502 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
503 java_lang_Throwable::fill_in_stack_trace(exception);
504 JVM_END
505
506
507 // java.lang.StackTraceElement //////////////////////////////////////////////
508
509
510 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
511 JVMWrapper("JVM_InitStackTraceElementArray");
512 Handle exception(THREAD, JNIHandles::resolve(throwable));
513 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
514 objArrayHandle stack_trace(THREAD, st);
515 // Fill in the allocated stack trace
516 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
517 JVM_END
518
519
520 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
521 JVMWrapper("JVM_InitStackTraceElement");
522 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
523 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
524 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
525 JVM_END
526
527
528 // java.lang.StackWalker //////////////////////////////////////////////////////
529
530
531 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
532 jint skip_frames, jint frame_count, jint start_index,
533 jobjectArray frames))
534 JVMWrapper("JVM_CallStackWalk");
535 JavaThread* jt = (JavaThread*) THREAD;
536 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
537 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
538 }
539
540 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
541
542 // frames array is a Class<?>[] array when only getting caller reference,
543 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
544 // be null.
545 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
546 objArrayHandle frames_array_h(THREAD, fa);
547
548 int limit = start_index + frame_count;
549 if (frames_array_h->length() < limit) {
550 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
551 }
552
553 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
554 start_index, frames_array_h, CHECK_NULL);
555 return JNIHandles::make_local(env, result);
556 JVM_END
557
558
559 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
560 jint frame_count, jint start_index,
561 jobjectArray frames))
562 JVMWrapper("JVM_MoreStackWalk");
563 JavaThread* jt = (JavaThread*) THREAD;
564
565 // frames array is a Class<?>[] array when only getting caller reference,
566 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
567 // be null.
568 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
569 objArrayHandle frames_array_h(THREAD, fa);
570
571 int limit = start_index+frame_count;
572 if (frames_array_h->length() < limit) {
573 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
574 }
575
576 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
577 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
578 start_index, frames_array_h, THREAD);
579 JVM_END
580
581 // java.lang.Object ///////////////////////////////////////////////
582
583
584 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
585 JVMWrapper("JVM_IHashCode");
586 // as implemented in the classic virtual machine; return 0 if object is NULL
587 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
588 JVM_END
589
590
591 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
592 JVMWrapper("JVM_MonitorWait");
593 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
594 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
595 if (JvmtiExport::should_post_monitor_wait()) {
596 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
597
598 // The current thread already owns the monitor and it has not yet
599 // been added to the wait queue so the current thread cannot be
600 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
601 // event handler cannot accidentally consume an unpark() meant for
602 // the ParkEvent associated with this ObjectMonitor.
603 }
604 ObjectSynchronizer::wait(obj, ms, CHECK);
605 JVM_END
606
607
608 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
609 JVMWrapper("JVM_MonitorNotify");
610 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
611 ObjectSynchronizer::notify(obj, CHECK);
612 JVM_END
613
614
615 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
616 JVMWrapper("JVM_MonitorNotifyAll");
617 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
618 ObjectSynchronizer::notifyall(obj, CHECK);
619 JVM_END
620
621
622 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
623 JVMWrapper("JVM_Clone");
624 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
625 Klass* klass = obj->klass();
626 JvmtiVMObjectAllocEventCollector oam;
627
628 #ifdef ASSERT
629 // Just checking that the cloneable flag is set correct
630 if (obj->is_array()) {
631 guarantee(klass->is_cloneable(), "all arrays are cloneable");
632 } else {
633 guarantee(obj->is_instance(), "should be instanceOop");
634 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
635 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
636 }
637 #endif
638
639 // Check if class of obj supports the Cloneable interface.
640 // All arrays are considered to be cloneable (See JLS 20.1.5)
641 if (!klass->is_cloneable()) {
642 ResourceMark rm(THREAD);
643 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
644 }
645
646 // Make shallow object copy
647 const int size = obj->size();
648 oop new_obj_oop = NULL;
649 if (obj->is_array()) {
650 const int length = ((arrayOop)obj())->length();
651 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
652 } else {
653 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
654 }
655
656 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
657 // is modifying a reference field in the clonee, a non-oop-atomic copy might
658 // be suspended in the middle of copying the pointer and end up with parts
659 // of two different pointers in the field. Subsequent dereferences will crash.
660 // 4846409: an oop-copy of objects with long or double fields or arrays of same
661 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
662 // of oops. We know objects are aligned on a minimum of an jlong boundary.
663 // The same is true of StubRoutines::object_copy and the various oop_copy
664 // variants, and of the code generated by the inline_native_clone intrinsic.
665 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
666 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop,
667 align_object_size(size) / HeapWordsPerLong);
668 // Clear the header
669 new_obj_oop->init_mark();
670
671 // Store check (mark entire object and let gc sort it out)
672 BarrierSet* bs = Universe::heap()->barrier_set();
673 assert(bs->has_write_region_opt(), "Barrier set does not have write_region");
674 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size));
675
676 Handle new_obj(THREAD, new_obj_oop);
677 // Caution: this involves a java upcall, so the clone should be
678 // "gc-robust" by this stage.
679 if (klass->has_finalizer()) {
680 assert(obj->is_instance(), "should be instanceOop");
681 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
682 new_obj = Handle(THREAD, new_obj_oop);
683 }
684
685 return JNIHandles::make_local(env, new_obj());
686 JVM_END
687
688 // java.io.File ///////////////////////////////////////////////////////////////
689
690 JVM_LEAF(char*, JVM_NativePath(char* path))
691 JVMWrapper("JVM_NativePath");
692 return os::native_path(path);
693 JVM_END
694
695
696 // Misc. class handling ///////////////////////////////////////////////////////////
697
698
699 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
700 JVMWrapper("JVM_GetCallerClass");
701
702 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
703 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
704 // temporarily for existing code to use until a replacement API is defined.
705 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
706 Klass* k = thread->security_get_caller_class(depth);
707 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
708 }
709
710 // Getting the class of the caller frame.
711 //
712 // The call stack at this point looks something like this:
713 //
714 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
715 // [1] [ @CallerSensitive API.method ]
716 // [.] [ (skipped intermediate frames) ]
717 // [n] [ caller ]
718 vframeStream vfst(thread);
719 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
720 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
721 Method* m = vfst.method();
722 assert(m != NULL, "sanity");
723 switch (n) {
724 case 0:
725 // This must only be called from Reflection.getCallerClass
726 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
727 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
728 }
729 // fall-through
730 case 1:
731 // Frame 0 and 1 must be caller sensitive.
732 if (!m->caller_sensitive()) {
733 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
734 }
735 break;
736 default:
737 if (!m->is_ignored_by_security_stack_walk()) {
738 // We have reached the desired frame; return the holder class.
739 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
740 }
741 break;
742 }
743 }
744 return NULL;
745 JVM_END
746
747
748 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
749 JVMWrapper("JVM_FindPrimitiveClass");
750 oop mirror = NULL;
751 BasicType t = name2type(utf);
752 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
753 mirror = Universe::java_mirror(t);
754 }
755 if (mirror == NULL) {
756 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
757 } else {
758 return (jclass) JNIHandles::make_local(env, mirror);
759 }
760 JVM_END
761
762
763 // Returns a class loaded by the bootstrap class loader; or null
764 // if not found. ClassNotFoundException is not thrown.
765 // FindClassFromBootLoader is exported to the launcher for windows.
766 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
767 const char* name))
768 JVMWrapper("JVM_FindClassFromBootLoader");
769
770 // Java libraries should ensure that name is never null...
771 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
772 // It's impossible to create this class; the name cannot fit
773 // into the constant pool.
774 return NULL;
775 }
776
777 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
778 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
779 if (k == NULL) {
780 return NULL;
781 }
782
783 if (log_is_enabled(Debug, class, resolve)) {
784 trace_class_resolution(k);
785 }
786 return (jclass) JNIHandles::make_local(env, k->java_mirror());
787 JVM_END
788
789 // Find a class with this name in this loader, using the caller's protection domain.
790 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
791 jboolean init, jobject loader,
792 jclass caller))
793 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
794 // Java libraries should ensure that name is never null...
795 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
796 // It's impossible to create this class; the name cannot fit
797 // into the constant pool.
798 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
799 }
800
801 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
802
803 oop loader_oop = JNIHandles::resolve(loader);
804 oop from_class = JNIHandles::resolve(caller);
805 oop protection_domain = NULL;
806 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
807 // NPE. Put it in another way, the bootstrap class loader has all permission and
808 // thus no checkPackageAccess equivalence in the VM class loader.
809 // The caller is also passed as NULL by the java code if there is no security
810 // manager to avoid the performance cost of getting the calling class.
811 if (from_class != NULL && loader_oop != NULL) {
812 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
813 }
814
815 Handle h_loader(THREAD, loader_oop);
816 Handle h_prot(THREAD, protection_domain);
817 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
818 h_prot, false, THREAD);
819
820 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
821 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
822 }
823 return result;
824 JVM_END
825
826 // Currently only called from the old verifier.
827 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
828 jboolean init, jclass from))
829 JVMWrapper("JVM_FindClassFromClass");
830 if (name == NULL) {
831 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
832 }
833 if ((int)strlen(name) > Symbol::max_length()) {
834 // It's impossible to create this class; the name cannot fit
835 // into the constant pool.
836 Exceptions::fthrow(THREAD_AND_LOCATION,
837 vmSymbols::java_lang_NoClassDefFoundError(),
838 "Class name exceeds maximum length of %d: %s",
839 Symbol::max_length(),
840 name);
841 return 0;
842 }
843 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
844 oop from_class_oop = JNIHandles::resolve(from);
845 Klass* from_class = (from_class_oop == NULL)
846 ? (Klass*)NULL
847 : java_lang_Class::as_Klass(from_class_oop);
848 oop class_loader = NULL;
849 oop protection_domain = NULL;
850 if (from_class != NULL) {
851 class_loader = from_class->class_loader();
852 protection_domain = from_class->protection_domain();
853 }
854 Handle h_loader(THREAD, class_loader);
855 Handle h_prot (THREAD, protection_domain);
856 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
857 h_prot, true, thread);
858
859 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
860 // this function is generally only used for class loading during verification.
861 ResourceMark rm;
862 oop from_mirror = JNIHandles::resolve_non_null(from);
863 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
864 const char * from_name = from_class->external_name();
865
866 oop mirror = JNIHandles::resolve_non_null(result);
867 Klass* to_class = java_lang_Class::as_Klass(mirror);
868 const char * to = to_class->external_name();
869 log_debug(class, resolve)("%s %s (verification)", from_name, to);
870 }
871
872 return result;
873 JVM_END
874
875 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
876 if (loader.is_null()) {
877 return;
878 }
879
880 // check whether the current caller thread holds the lock or not.
881 // If not, increment the corresponding counter
882 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
883 ObjectSynchronizer::owner_self) {
884 counter->inc();
885 }
886 }
887
888 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
889 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
890 jobject loader, const jbyte *buf,
891 jsize len, jobject pd, const char *source,
892 TRAPS) {
893 if (source == NULL) source = "__JVM_DefineClass__";
894
895 assert(THREAD->is_Java_thread(), "must be a JavaThread");
896 JavaThread* jt = (JavaThread*) THREAD;
897
898 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
899 ClassLoader::perf_define_appclass_selftime(),
900 ClassLoader::perf_define_appclasses(),
901 jt->get_thread_stat()->perf_recursion_counts_addr(),
902 jt->get_thread_stat()->perf_timers_addr(),
903 PerfClassTraceTime::DEFINE_CLASS);
904
905 if (UsePerfData) {
906 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
907 }
908
909 // Since exceptions can be thrown, class initialization can take place
910 // if name is NULL no check for class name in .class stream has to be made.
911 TempNewSymbol class_name = NULL;
912 if (name != NULL) {
913 const int str_len = (int)strlen(name);
914 if (str_len > Symbol::max_length()) {
915 // It's impossible to create this class; the name cannot fit
916 // into the constant pool.
917 Exceptions::fthrow(THREAD_AND_LOCATION,
918 vmSymbols::java_lang_NoClassDefFoundError(),
919 "Class name exceeds maximum length of %d: %s",
920 Symbol::max_length(),
921 name);
922 return 0;
923 }
924 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
925 }
926
927 ResourceMark rm(THREAD);
928 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
929 Handle class_loader (THREAD, JNIHandles::resolve(loader));
930 if (UsePerfData) {
931 is_lock_held_by_thread(class_loader,
932 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
933 THREAD);
934 }
935 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
936 Klass* k = SystemDictionary::resolve_from_stream(class_name,
937 class_loader,
938 protection_domain,
939 &st,
940 CHECK_NULL);
941
942 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
943 trace_class_resolution(k);
944 }
945
946 return (jclass) JNIHandles::make_local(env, k->java_mirror());
947 }
948
949
950 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
951 JVMWrapper("JVM_DefineClass");
952
953 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
954 JVM_END
955
956
957 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
958 JVMWrapper("JVM_DefineClassWithSource");
959
960 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
961 JVM_END
962
963 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
964 JVMWrapper("JVM_FindLoadedClass");
965 ResourceMark rm(THREAD);
966
967 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
968 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
969
970 const char* str = java_lang_String::as_utf8_string(string());
971 // Sanity check, don't expect null
972 if (str == NULL) return NULL;
973
974 const int str_len = (int)strlen(str);
975 if (str_len > Symbol::max_length()) {
976 // It's impossible to create this class; the name cannot fit
977 // into the constant pool.
978 return NULL;
979 }
980 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
981
982 // Security Note:
983 // The Java level wrapper will perform the necessary security check allowing
984 // us to pass the NULL as the initiating class loader.
985 Handle h_loader(THREAD, JNIHandles::resolve(loader));
986 if (UsePerfData) {
987 is_lock_held_by_thread(h_loader,
988 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
989 THREAD);
990 }
991
992 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
993 h_loader,
994 Handle(),
995 CHECK_NULL);
996 #if INCLUDE_CDS
997 if (k == NULL) {
998 // If the class is not already loaded, try to see if it's in the shared
999 // archive for the current classloader (h_loader).
1000 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1001 }
1002 #endif
1003 return (k == NULL) ? NULL :
1004 (jclass) JNIHandles::make_local(env, k->java_mirror());
1005 JVM_END
1006
1007 // Module support //////////////////////////////////////////////////////////////////////////////
1008
1009 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1010 jstring location, const char* const* packages, jsize num_packages))
1011 JVMWrapper("JVM_DefineModule");
1012 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1013 JVM_END
1014
1015 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1016 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1017 Modules::set_bootloader_unnamed_module(module, CHECK);
1018 JVM_END
1019
1020 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1021 JVMWrapper("JVM_AddModuleExports");
1022 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1023 JVM_END
1024
1025 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1026 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1027 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1028 JVM_END
1029
1030 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1031 JVMWrapper("JVM_AddModuleExportsToAll");
1032 Modules::add_module_exports(from_module, package, NULL, CHECK);
1033 JVM_END
1034
1035 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1036 JVMWrapper("JVM_AddReadsModule");
1037 Modules::add_reads_module(from_module, source_module, CHECK);
1038 JVM_END
1039
1040 // Reflection support //////////////////////////////////////////////////////////////////////////////
1041
1042 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1043 assert (cls != NULL, "illegal class");
1044 JVMWrapper("JVM_GetClassName");
1045 JvmtiVMObjectAllocEventCollector oam;
1046 ResourceMark rm(THREAD);
1047 const char* name;
1048 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1049 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1050 } else {
1051 // Consider caching interned string in Klass
1052 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1053 assert(k->is_klass(), "just checking");
1054 name = k->external_name();
1055 }
1056 oop result = StringTable::intern((char*) name, CHECK_NULL);
1057 return (jstring) JNIHandles::make_local(env, result);
1058 JVM_END
1059
1060
1061 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1062 JVMWrapper("JVM_GetClassInterfaces");
1063 JvmtiVMObjectAllocEventCollector oam;
1064 oop mirror = JNIHandles::resolve_non_null(cls);
1065
1066 // Special handling for primitive objects
1067 if (java_lang_Class::is_primitive(mirror)) {
1068 // Primitive objects does not have any interfaces
1069 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1070 return (jobjectArray) JNIHandles::make_local(env, r);
1071 }
1072
1073 Klass* klass = java_lang_Class::as_Klass(mirror);
1074 // Figure size of result array
1075 int size;
1076 if (klass->is_instance_klass()) {
1077 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1078 } else {
1079 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1080 size = 2;
1081 }
1082
1083 // Allocate result array
1084 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1085 objArrayHandle result (THREAD, r);
1086 // Fill in result
1087 if (klass->is_instance_klass()) {
1088 // Regular instance klass, fill in all local interfaces
1089 for (int index = 0; index < size; index++) {
1090 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1091 result->obj_at_put(index, k->java_mirror());
1092 }
1093 } else {
1094 // All arrays implement java.lang.Cloneable and java.io.Serializable
1095 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1096 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1097 }
1098 return (jobjectArray) JNIHandles::make_local(env, result());
1099 JVM_END
1100
1101
1102 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1103 JVMWrapper("JVM_IsInterface");
1104 oop mirror = JNIHandles::resolve_non_null(cls);
1105 if (java_lang_Class::is_primitive(mirror)) {
1106 return JNI_FALSE;
1107 }
1108 Klass* k = java_lang_Class::as_Klass(mirror);
1109 jboolean result = k->is_interface();
1110 assert(!result || k->is_instance_klass(),
1111 "all interfaces are instance types");
1112 // The compiler intrinsic for isInterface tests the
1113 // Klass::_access_flags bits in the same way.
1114 return result;
1115 JVM_END
1116
1117
1118 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1119 JVMWrapper("JVM_GetClassSigners");
1120 JvmtiVMObjectAllocEventCollector oam;
1121 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1122 // There are no signers for primitive types
1123 return NULL;
1124 }
1125
1126 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1127
1128 // If there are no signers set in the class, or if the class
1129 // is an array, return NULL.
1130 if (signers == NULL) return NULL;
1131
1132 // copy of the signers array
1133 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1134 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1135 for (int index = 0; index < signers->length(); index++) {
1136 signers_copy->obj_at_put(index, signers->obj_at(index));
1137 }
1138
1139 // return the copy
1140 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1141 JVM_END
1142
1143
1144 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1145 JVMWrapper("JVM_SetClassSigners");
1146 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1147 // This call is ignored for primitive types and arrays.
1148 // Signers are only set once, ClassLoader.java, and thus shouldn't
1149 // be called with an array. Only the bootstrap loader creates arrays.
1150 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1151 if (k->is_instance_klass()) {
1152 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1153 }
1154 }
1155 JVM_END
1156
1157
1158 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1159 JVMWrapper("JVM_GetProtectionDomain");
1160 if (JNIHandles::resolve(cls) == NULL) {
1161 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1162 }
1163
1164 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1165 // Primitive types does not have a protection domain.
1166 return NULL;
1167 }
1168
1169 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1170 return (jobject) JNIHandles::make_local(env, pd);
1171 JVM_END
1172
1173
1174 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) {
1175 // If there is a security manager and protection domain, check the access
1176 // in the protection domain, otherwise it is authorized.
1177 if (java_lang_System::has_security_manager()) {
1178
1179 // For bootstrapping, if pd implies method isn't in the JDK, allow
1180 // this context to revert to older behavior.
1181 // In this case the isAuthorized field in AccessControlContext is also not
1182 // present.
1183 if (Universe::protection_domain_implies_method() == NULL) {
1184 return true;
1185 }
1186
1187 // Whitelist certain access control contexts
1188 if (java_security_AccessControlContext::is_authorized(context)) {
1189 return true;
1190 }
1191
1192 oop prot = klass->protection_domain();
1193 if (prot != NULL) {
1194 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1195 // in the new wrapper.
1196 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1197 Handle h_prot(THREAD, prot);
1198 JavaValue result(T_BOOLEAN);
1199 JavaCallArguments args(h_prot);
1200 JavaCalls::call(&result, m, &args, CHECK_false);
1201 return (result.get_jboolean() != 0);
1202 }
1203 }
1204 return true;
1205 }
1206
1207 // Create an AccessControlContext with a protection domain with null codesource
1208 // and null permissions - which gives no permissions.
1209 oop create_dummy_access_control_context(TRAPS) {
1210 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1211 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1212 // Call constructor ProtectionDomain(null, null);
1213 JavaValue result(T_VOID);
1214 JavaCalls::call_special(&result, obj, pd_klass,
1215 vmSymbols::object_initializer_name(),
1216 vmSymbols::codesource_permissioncollection_signature(),
1217 Handle(), Handle(), CHECK_NULL);
1218
1219 // new ProtectionDomain[] {pd};
1220 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1221 context->obj_at_put(0, obj());
1222
1223 // new AccessControlContext(new ProtectionDomain[] {pd})
1224 objArrayHandle h_context(THREAD, context);
1225 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1226 return acc;
1227 }
1228
1229 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1230 JVMWrapper("JVM_DoPrivileged");
1231
1232 if (action == NULL) {
1233 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1234 }
1235
1236 // Compute the frame initiating the do privileged operation and setup the privileged stack
1237 vframeStream vfst(thread);
1238 vfst.security_get_caller_frame(1);
1239
1240 if (vfst.at_end()) {
1241 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1242 }
1243
1244 Method* method = vfst.method();
1245 InstanceKlass* klass = method->method_holder();
1246
1247 // Check that action object understands "Object run()"
1248 Handle h_context;
1249 if (context != NULL) {
1250 h_context = Handle(THREAD, JNIHandles::resolve(context));
1251 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1252 if (!authorized) {
1253 // Create an unprivileged access control object and call it's run function
1254 // instead.
1255 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1256 h_context = Handle(THREAD, noprivs);
1257 }
1258 }
1259
1260 // Check that action object understands "Object run()"
1261 Handle object (THREAD, JNIHandles::resolve(action));
1262
1263 // get run() method
1264 Method* m_oop = object->klass()->uncached_lookup_method(
1265 vmSymbols::run_method_name(),
1266 vmSymbols::void_object_signature(),
1267 Klass::find_overpass);
1268
1269 // See if there is a default method for "Object run()".
1270 if (m_oop == NULL && object->klass()->is_instance_klass()) {
1271 InstanceKlass* iklass = InstanceKlass::cast(object->klass());
1272 m_oop = iklass->lookup_method_in_ordered_interfaces(
1273 vmSymbols::run_method_name(),
1274 vmSymbols::void_object_signature());
1275 }
1276
1277 methodHandle m (THREAD, m_oop);
1278 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) {
1279 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1280 }
1281
1282 // Stack allocated list of privileged stack elements
1283 PrivilegedElement pi;
1284 if (!vfst.at_end()) {
1285 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1286 thread->set_privileged_stack_top(&pi);
1287 }
1288
1289
1290 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1291 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1292 Handle pending_exception;
1293 JavaValue result(T_OBJECT);
1294 JavaCallArguments args(object);
1295 JavaCalls::call(&result, m, &args, THREAD);
1296
1297 // done with action, remove ourselves from the list
1298 if (!vfst.at_end()) {
1299 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1300 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1301 }
1302
1303 if (HAS_PENDING_EXCEPTION) {
1304 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1305 CLEAR_PENDING_EXCEPTION;
1306 // JVMTI has already reported the pending exception
1307 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1308 if (THREAD->is_Java_thread()) {
1309 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1310 }
1311 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1312 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1313 // Throw a java.security.PrivilegedActionException(Exception e) exception
1314 JavaCallArguments args(pending_exception);
1315 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1316 vmSymbols::exception_void_signature(),
1317 &args);
1318 }
1319 }
1320
1321 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1322 return JNIHandles::make_local(env, (oop) result.get_jobject());
1323 JVM_END
1324
1325
1326 // Returns the inherited_access_control_context field of the running thread.
1327 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1328 JVMWrapper("JVM_GetInheritedAccessControlContext");
1329 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1330 return JNIHandles::make_local(env, result);
1331 JVM_END
1332
1333 class RegisterArrayForGC {
1334 private:
1335 JavaThread *_thread;
1336 public:
1337 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1338 _thread = thread;
1339 _thread->register_array_for_gc(array);
1340 }
1341
1342 ~RegisterArrayForGC() {
1343 _thread->register_array_for_gc(NULL);
1344 }
1345 };
1346
1347
1348 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1349 JVMWrapper("JVM_GetStackAccessControlContext");
1350 if (!UsePrivilegedStack) return NULL;
1351
1352 ResourceMark rm(THREAD);
1353 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1354 JvmtiVMObjectAllocEventCollector oam;
1355
1356 // count the protection domains on the execution stack. We collapse
1357 // duplicate consecutive protection domains into a single one, as
1358 // well as stopping when we hit a privileged frame.
1359
1360 // Use vframeStream to iterate through Java frames
1361 vframeStream vfst(thread);
1362
1363 oop previous_protection_domain = NULL;
1364 Handle privileged_context(thread, NULL);
1365 bool is_privileged = false;
1366 oop protection_domain = NULL;
1367
1368 for(; !vfst.at_end(); vfst.next()) {
1369 // get method of frame
1370 Method* method = vfst.method();
1371 intptr_t* frame_id = vfst.frame_id();
1372
1373 // check the privileged frames to see if we have a match
1374 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1375 // this frame is privileged
1376 is_privileged = true;
1377 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1378 protection_domain = thread->privileged_stack_top()->protection_domain();
1379 } else {
1380 protection_domain = method->method_holder()->protection_domain();
1381 }
1382
1383 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1384 local_array->push(protection_domain);
1385 previous_protection_domain = protection_domain;
1386 }
1387
1388 if (is_privileged) break;
1389 }
1390
1391
1392 // either all the domains on the stack were system domains, or
1393 // we had a privileged system domain
1394 if (local_array->is_empty()) {
1395 if (is_privileged && privileged_context.is_null()) return NULL;
1396
1397 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1398 return JNIHandles::make_local(env, result);
1399 }
1400
1401 // the resource area must be registered in case of a gc
1402 RegisterArrayForGC ragc(thread, local_array);
1403 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1404 local_array->length(), CHECK_NULL);
1405 objArrayHandle h_context(thread, context);
1406 for (int index = 0; index < local_array->length(); index++) {
1407 h_context->obj_at_put(index, local_array->at(index));
1408 }
1409
1410 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1411
1412 return JNIHandles::make_local(env, result);
1413 JVM_END
1414
1415
1416 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1417 JVMWrapper("JVM_IsArrayClass");
1418 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1419 return (k != NULL) && k->is_array_klass() ? true : false;
1420 JVM_END
1421
1422
1423 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1424 JVMWrapper("JVM_IsPrimitiveClass");
1425 oop mirror = JNIHandles::resolve_non_null(cls);
1426 return (jboolean) java_lang_Class::is_primitive(mirror);
1427 JVM_END
1428
1429
1430 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1431 JVMWrapper("JVM_GetClassModifiers");
1432 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1433 // Primitive type
1434 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1435 }
1436
1437 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1438 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1439 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1440 return k->modifier_flags();
1441 JVM_END
1442
1443
1444 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1445
1446 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1447 JvmtiVMObjectAllocEventCollector oam;
1448 // ofClass is a reference to a java_lang_Class object. The mirror object
1449 // of an InstanceKlass
1450
1451 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1452 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1453 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1454 return (jobjectArray)JNIHandles::make_local(env, result);
1455 }
1456
1457 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1458 InnerClassesIterator iter(k);
1459
1460 if (iter.length() == 0) {
1461 // Neither an inner nor outer class
1462 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1463 return (jobjectArray)JNIHandles::make_local(env, result);
1464 }
1465
1466 // find inner class info
1467 constantPoolHandle cp(thread, k->constants());
1468 int length = iter.length();
1469
1470 // Allocate temp. result array
1471 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1472 objArrayHandle result (THREAD, r);
1473 int members = 0;
1474
1475 for (; !iter.done(); iter.next()) {
1476 int ioff = iter.inner_class_info_index();
1477 int ooff = iter.outer_class_info_index();
1478
1479 if (ioff != 0 && ooff != 0) {
1480 // Check to see if the name matches the class we're looking for
1481 // before attempting to find the class.
1482 if (cp->klass_name_at_matches(k, ooff)) {
1483 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1484 if (outer_klass == k) {
1485 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1486 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1487
1488 // Throws an exception if outer klass has not declared k as
1489 // an inner klass
1490 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1491
1492 result->obj_at_put(members, inner_klass->java_mirror());
1493 members++;
1494 }
1495 }
1496 }
1497 }
1498
1499 if (members != length) {
1500 // Return array of right length
1501 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1502 for(int i = 0; i < members; i++) {
1503 res->obj_at_put(i, result->obj_at(i));
1504 }
1505 return (jobjectArray)JNIHandles::make_local(env, res);
1506 }
1507
1508 return (jobjectArray)JNIHandles::make_local(env, result());
1509 JVM_END
1510
1511
1512 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1513 {
1514 // ofClass is a reference to a java_lang_Class object.
1515 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1516 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1517 return NULL;
1518 }
1519
1520 bool inner_is_member = false;
1521 Klass* outer_klass
1522 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1523 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1524 if (outer_klass == NULL) return NULL; // already a top-level class
1525 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1526 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1527 }
1528 JVM_END
1529
1530 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1531 {
1532 oop mirror = JNIHandles::resolve_non_null(cls);
1533 if (java_lang_Class::is_primitive(mirror) ||
1534 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1535 return NULL;
1536 }
1537 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1538 int ooff = 0, noff = 0;
1539 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1540 if (noff != 0) {
1541 constantPoolHandle i_cp(thread, k->constants());
1542 Symbol* name = i_cp->symbol_at(noff);
1543 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1544 return (jstring) JNIHandles::make_local(env, str());
1545 }
1546 }
1547 return NULL;
1548 }
1549 JVM_END
1550
1551 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1552 assert (cls != NULL, "illegal class");
1553 JVMWrapper("JVM_GetClassSignature");
1554 JvmtiVMObjectAllocEventCollector oam;
1555 ResourceMark rm(THREAD);
1556 // Return null for arrays and primatives
1557 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1558 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1559 if (k->is_instance_klass()) {
1560 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1561 if (sym == NULL) return NULL;
1562 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1563 return (jstring) JNIHandles::make_local(env, str());
1564 }
1565 }
1566 return NULL;
1567 JVM_END
1568
1569
1570 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1571 assert (cls != NULL, "illegal class");
1572 JVMWrapper("JVM_GetClassAnnotations");
1573
1574 // Return null for arrays and primitives
1575 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1576 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1577 if (k->is_instance_klass()) {
1578 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1579 return (jbyteArray) JNIHandles::make_local(env, a);
1580 }
1581 }
1582 return NULL;
1583 JVM_END
1584
1585
1586 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1587 // some of this code was adapted from from jni_FromReflectedField
1588
1589 oop reflected = JNIHandles::resolve_non_null(field);
1590 oop mirror = java_lang_reflect_Field::clazz(reflected);
1591 Klass* k = java_lang_Class::as_Klass(mirror);
1592 int slot = java_lang_reflect_Field::slot(reflected);
1593 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1594
1595 InstanceKlass* ik = InstanceKlass::cast(k);
1596 intptr_t offset = ik->field_offset(slot);
1597
1598 if (modifiers & JVM_ACC_STATIC) {
1599 // for static fields we only look in the current class
1600 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1601 assert(false, "cannot find static field");
1602 return false;
1603 }
1604 } else {
1605 // for instance fields we start with the current class and work
1606 // our way up through the superclass chain
1607 if (!ik->find_field_from_offset(offset, false, &fd)) {
1608 assert(false, "cannot find instance field");
1609 return false;
1610 }
1611 }
1612 return true;
1613 }
1614
1615 static Method* jvm_get_method_common(jobject method) {
1616 // some of this code was adapted from from jni_FromReflectedMethod
1617
1618 oop reflected = JNIHandles::resolve_non_null(method);
1619 oop mirror = NULL;
1620 int slot = 0;
1621
1622 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1623 mirror = java_lang_reflect_Constructor::clazz(reflected);
1624 slot = java_lang_reflect_Constructor::slot(reflected);
1625 } else {
1626 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1627 "wrong type");
1628 mirror = java_lang_reflect_Method::clazz(reflected);
1629 slot = java_lang_reflect_Method::slot(reflected);
1630 }
1631 Klass* k = java_lang_Class::as_Klass(mirror);
1632
1633 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1634 assert(m != NULL, "cannot find method");
1635 return m; // caller has to deal with NULL in product mode
1636 }
1637
1638 /* Type use annotations support (JDK 1.8) */
1639
1640 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1641 assert (cls != NULL, "illegal class");
1642 JVMWrapper("JVM_GetClassTypeAnnotations");
1643 ResourceMark rm(THREAD);
1644 // Return null for arrays and primitives
1645 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1646 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1647 if (k->is_instance_klass()) {
1648 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1649 if (type_annotations != NULL) {
1650 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1651 return (jbyteArray) JNIHandles::make_local(env, a);
1652 }
1653 }
1654 }
1655 return NULL;
1656 JVM_END
1657
1658 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1659 assert (method != NULL, "illegal method");
1660 JVMWrapper("JVM_GetMethodTypeAnnotations");
1661
1662 // method is a handle to a java.lang.reflect.Method object
1663 Method* m = jvm_get_method_common(method);
1664 if (m == NULL) {
1665 return NULL;
1666 }
1667
1668 AnnotationArray* type_annotations = m->type_annotations();
1669 if (type_annotations != NULL) {
1670 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1671 return (jbyteArray) JNIHandles::make_local(env, a);
1672 }
1673
1674 return NULL;
1675 JVM_END
1676
1677 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1678 assert (field != NULL, "illegal field");
1679 JVMWrapper("JVM_GetFieldTypeAnnotations");
1680
1681 fieldDescriptor fd;
1682 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1683 if (!gotFd) {
1684 return NULL;
1685 }
1686
1687 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1688 JVM_END
1689
1690 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1691 if (!cp->is_within_bounds(index)) {
1692 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1693 }
1694 }
1695
1696 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1697 {
1698 JVMWrapper("JVM_GetMethodParameters");
1699 // method is a handle to a java.lang.reflect.Method object
1700 Method* method_ptr = jvm_get_method_common(method);
1701 methodHandle mh (THREAD, method_ptr);
1702 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1703 const int num_params = mh->method_parameters_length();
1704
1705 if (num_params < 0) {
1706 // A -1 return value from method_parameters_length means there is no
1707 // parameter data. Return null to indicate this to the reflection
1708 // API.
1709 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1710 return (jobjectArray)NULL;
1711 } else {
1712 // Otherwise, we return something up to reflection, even if it is
1713 // a zero-length array. Why? Because in some cases this can
1714 // trigger a MalformedParametersException.
1715
1716 // make sure all the symbols are properly formatted
1717 for (int i = 0; i < num_params; i++) {
1718 MethodParametersElement* params = mh->method_parameters_start();
1719 int index = params[i].name_cp_index;
1720 bounds_check(mh->constants(), index, CHECK_NULL);
1721
1722 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1723 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1724 "Wrong type at constant pool index");
1725 }
1726
1727 }
1728
1729 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1730 objArrayHandle result (THREAD, result_oop);
1731
1732 for (int i = 0; i < num_params; i++) {
1733 MethodParametersElement* params = mh->method_parameters_start();
1734 // For a 0 index, give a NULL symbol
1735 Symbol* sym = 0 != params[i].name_cp_index ?
1736 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1737 int flags = params[i].flags;
1738 oop param = Reflection::new_parameter(reflected_method, i, sym,
1739 flags, CHECK_NULL);
1740 result->obj_at_put(i, param);
1741 }
1742 return (jobjectArray)JNIHandles::make_local(env, result());
1743 }
1744 }
1745 JVM_END
1746
1747 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1748
1749 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1750 {
1751 JVMWrapper("JVM_GetClassDeclaredFields");
1752 JvmtiVMObjectAllocEventCollector oam;
1753
1754 // Exclude primitive types and array types
1755 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1756 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1757 // Return empty array
1758 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1759 return (jobjectArray) JNIHandles::make_local(env, res);
1760 }
1761
1762 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1763 constantPoolHandle cp(THREAD, k->constants());
1764
1765 // Ensure class is linked
1766 k->link_class(CHECK_NULL);
1767
1768 // Allocate result
1769 int num_fields;
1770
1771 if (publicOnly) {
1772 num_fields = 0;
1773 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1774 if (fs.access_flags().is_public()) ++num_fields;
1775 }
1776 } else {
1777 num_fields = k->java_fields_count();
1778 }
1779
1780 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1781 objArrayHandle result (THREAD, r);
1782
1783 int out_idx = 0;
1784 fieldDescriptor fd;
1785 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1786 if (!publicOnly || fs.access_flags().is_public()) {
1787 fd.reinitialize(k, fs.index());
1788 oop field = Reflection::new_field(&fd, CHECK_NULL);
1789 result->obj_at_put(out_idx, field);
1790 ++out_idx;
1791 }
1792 }
1793 assert(out_idx == num_fields, "just checking");
1794 return (jobjectArray) JNIHandles::make_local(env, result());
1795 }
1796 JVM_END
1797
1798 static bool select_method(const methodHandle& method, bool want_constructor) {
1799 if (want_constructor) {
1800 return (method->is_initializer() && !method->is_static());
1801 } else {
1802 return (!method->is_initializer() && !method->is_overpass());
1803 }
1804 }
1805
1806 static jobjectArray get_class_declared_methods_helper(
1807 JNIEnv *env,
1808 jclass ofClass, jboolean publicOnly,
1809 bool want_constructor,
1810 Klass* klass, TRAPS) {
1811
1812 JvmtiVMObjectAllocEventCollector oam;
1813
1814 // Exclude primitive types and array types
1815 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1816 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1817 // Return empty array
1818 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1819 return (jobjectArray) JNIHandles::make_local(env, res);
1820 }
1821
1822 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1823
1824 // Ensure class is linked
1825 k->link_class(CHECK_NULL);
1826
1827 Array<Method*>* methods = k->methods();
1828 int methods_length = methods->length();
1829
1830 // Save original method_idnum in case of redefinition, which can change
1831 // the idnum of obsolete methods. The new method will have the same idnum
1832 // but if we refresh the methods array, the counts will be wrong.
1833 ResourceMark rm(THREAD);
1834 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1835 int num_methods = 0;
1836
1837 for (int i = 0; i < methods_length; i++) {
1838 methodHandle method(THREAD, methods->at(i));
1839 if (select_method(method, want_constructor)) {
1840 if (!publicOnly || method->is_public()) {
1841 idnums->push(method->method_idnum());
1842 ++num_methods;
1843 }
1844 }
1845 }
1846
1847 // Allocate result
1848 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1849 objArrayHandle result (THREAD, r);
1850
1851 // Now just put the methods that we selected above, but go by their idnum
1852 // in case of redefinition. The methods can be redefined at any safepoint,
1853 // so above when allocating the oop array and below when creating reflect
1854 // objects.
1855 for (int i = 0; i < num_methods; i++) {
1856 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1857 if (method.is_null()) {
1858 // Method may have been deleted and seems this API can handle null
1859 // Otherwise should probably put a method that throws NSME
1860 result->obj_at_put(i, NULL);
1861 } else {
1862 oop m;
1863 if (want_constructor) {
1864 m = Reflection::new_constructor(method, CHECK_NULL);
1865 } else {
1866 m = Reflection::new_method(method, false, CHECK_NULL);
1867 }
1868 result->obj_at_put(i, m);
1869 }
1870 }
1871
1872 return (jobjectArray) JNIHandles::make_local(env, result());
1873 }
1874
1875 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1876 {
1877 JVMWrapper("JVM_GetClassDeclaredMethods");
1878 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1879 /*want_constructor*/ false,
1880 SystemDictionary::reflect_Method_klass(), THREAD);
1881 }
1882 JVM_END
1883
1884 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1885 {
1886 JVMWrapper("JVM_GetClassDeclaredConstructors");
1887 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1888 /*want_constructor*/ true,
1889 SystemDictionary::reflect_Constructor_klass(), THREAD);
1890 }
1891 JVM_END
1892
1893 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1894 {
1895 JVMWrapper("JVM_GetClassAccessFlags");
1896 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1897 // Primitive type
1898 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1899 }
1900
1901 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1902 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1903 }
1904 JVM_END
1905
1906
1907 // Constant pool access //////////////////////////////////////////////////////////
1908
1909 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1910 {
1911 JVMWrapper("JVM_GetClassConstantPool");
1912 JvmtiVMObjectAllocEventCollector oam;
1913
1914 // Return null for primitives and arrays
1915 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1916 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1917 if (k->is_instance_klass()) {
1918 InstanceKlass* k_h = InstanceKlass::cast(k);
1919 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1920 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1921 return JNIHandles::make_local(jcp());
1922 }
1923 }
1924 return NULL;
1925 }
1926 JVM_END
1927
1928
1929 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1930 {
1931 JVMWrapper("JVM_ConstantPoolGetSize");
1932 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1933 return cp->length();
1934 }
1935 JVM_END
1936
1937
1938 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1939 {
1940 JVMWrapper("JVM_ConstantPoolGetClassAt");
1941 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1942 bounds_check(cp, index, CHECK_NULL);
1943 constantTag tag = cp->tag_at(index);
1944 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1945 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1946 }
1947 Klass* k = cp->klass_at(index, CHECK_NULL);
1948 return (jclass) JNIHandles::make_local(k->java_mirror());
1949 }
1950 JVM_END
1951
1952 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1953 {
1954 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1955 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1956 bounds_check(cp, index, CHECK_NULL);
1957 constantTag tag = cp->tag_at(index);
1958 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1959 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1960 }
1961 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1962 if (k == NULL) return NULL;
1963 return (jclass) JNIHandles::make_local(k->java_mirror());
1964 }
1965 JVM_END
1966
1967 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1968 constantTag tag = cp->tag_at(index);
1969 if (!tag.is_method() && !tag.is_interface_method()) {
1970 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1971 }
1972 int klass_ref = cp->uncached_klass_ref_index_at(index);
1973 Klass* k_o;
1974 if (force_resolution) {
1975 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1976 } else {
1977 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1978 if (k_o == NULL) return NULL;
1979 }
1980 InstanceKlass* k = InstanceKlass::cast(k_o);
1981 Symbol* name = cp->uncached_name_ref_at(index);
1982 Symbol* sig = cp->uncached_signature_ref_at(index);
1983 methodHandle m (THREAD, k->find_method(name, sig));
1984 if (m.is_null()) {
1985 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1986 }
1987 oop method;
1988 if (!m->is_initializer() || m->is_static()) {
1989 method = Reflection::new_method(m, true, CHECK_NULL);
1990 } else {
1991 method = Reflection::new_constructor(m, CHECK_NULL);
1992 }
1993 return JNIHandles::make_local(method);
1994 }
1995
1996 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1997 {
1998 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1999 JvmtiVMObjectAllocEventCollector oam;
2000 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2001 bounds_check(cp, index, CHECK_NULL);
2002 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2003 return res;
2004 }
2005 JVM_END
2006
2007 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2008 {
2009 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2010 JvmtiVMObjectAllocEventCollector oam;
2011 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2012 bounds_check(cp, index, CHECK_NULL);
2013 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2014 return res;
2015 }
2016 JVM_END
2017
2018 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2019 constantTag tag = cp->tag_at(index);
2020 if (!tag.is_field()) {
2021 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2022 }
2023 int klass_ref = cp->uncached_klass_ref_index_at(index);
2024 Klass* k_o;
2025 if (force_resolution) {
2026 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2027 } else {
2028 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2029 if (k_o == NULL) return NULL;
2030 }
2031 InstanceKlass* k = InstanceKlass::cast(k_o);
2032 Symbol* name = cp->uncached_name_ref_at(index);
2033 Symbol* sig = cp->uncached_signature_ref_at(index);
2034 fieldDescriptor fd;
2035 Klass* target_klass = k->find_field(name, sig, &fd);
2036 if (target_klass == NULL) {
2037 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2038 }
2039 oop field = Reflection::new_field(&fd, CHECK_NULL);
2040 return JNIHandles::make_local(field);
2041 }
2042
2043 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2044 {
2045 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2046 JvmtiVMObjectAllocEventCollector oam;
2047 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2048 bounds_check(cp, index, CHECK_NULL);
2049 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2050 return res;
2051 }
2052 JVM_END
2053
2054 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2055 {
2056 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2057 JvmtiVMObjectAllocEventCollector oam;
2058 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2059 bounds_check(cp, index, CHECK_NULL);
2060 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2061 return res;
2062 }
2063 JVM_END
2064
2065 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2066 {
2067 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2068 JvmtiVMObjectAllocEventCollector oam;
2069 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2070 bounds_check(cp, index, CHECK_NULL);
2071 constantTag tag = cp->tag_at(index);
2072 if (!tag.is_field_or_method()) {
2073 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2074 }
2075 int klass_ref = cp->uncached_klass_ref_index_at(index);
2076 Symbol* klass_name = cp->klass_name_at(klass_ref);
2077 Symbol* member_name = cp->uncached_name_ref_at(index);
2078 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2079 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2080 objArrayHandle dest(THREAD, dest_o);
2081 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2082 dest->obj_at_put(0, str());
2083 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2084 dest->obj_at_put(1, str());
2085 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2086 dest->obj_at_put(2, str());
2087 return (jobjectArray) JNIHandles::make_local(dest());
2088 }
2089 JVM_END
2090
2091 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2092 {
2093 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2094 JvmtiVMObjectAllocEventCollector oam;
2095 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2096 bounds_check(cp, index, CHECK_0);
2097 constantTag tag = cp->tag_at(index);
2098 if (!tag.is_field_or_method()) {
2099 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2100 }
2101 return (jint) cp->uncached_klass_ref_index_at(index);
2102 }
2103 JVM_END
2104
2105 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2106 {
2107 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2108 JvmtiVMObjectAllocEventCollector oam;
2109 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2110 bounds_check(cp, index, CHECK_0);
2111 constantTag tag = cp->tag_at(index);
2112 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2113 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2114 }
2115 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2116 }
2117 JVM_END
2118
2119 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2120 {
2121 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2122 JvmtiVMObjectAllocEventCollector oam;
2123 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2124 bounds_check(cp, index, CHECK_NULL);
2125 constantTag tag = cp->tag_at(index);
2126 if (!tag.is_name_and_type()) {
2127 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2128 }
2129 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2130 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2131 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2132 objArrayHandle dest(THREAD, dest_o);
2133 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2134 dest->obj_at_put(0, str());
2135 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2136 dest->obj_at_put(1, str());
2137 return (jobjectArray) JNIHandles::make_local(dest());
2138 }
2139 JVM_END
2140
2141 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2142 {
2143 JVMWrapper("JVM_ConstantPoolGetIntAt");
2144 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2145 bounds_check(cp, index, CHECK_0);
2146 constantTag tag = cp->tag_at(index);
2147 if (!tag.is_int()) {
2148 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2149 }
2150 return cp->int_at(index);
2151 }
2152 JVM_END
2153
2154 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2155 {
2156 JVMWrapper("JVM_ConstantPoolGetLongAt");
2157 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2158 bounds_check(cp, index, CHECK_(0L));
2159 constantTag tag = cp->tag_at(index);
2160 if (!tag.is_long()) {
2161 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2162 }
2163 return cp->long_at(index);
2164 }
2165 JVM_END
2166
2167 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2168 {
2169 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2170 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2171 bounds_check(cp, index, CHECK_(0.0f));
2172 constantTag tag = cp->tag_at(index);
2173 if (!tag.is_float()) {
2174 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2175 }
2176 return cp->float_at(index);
2177 }
2178 JVM_END
2179
2180 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2181 {
2182 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2183 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2184 bounds_check(cp, index, CHECK_(0.0));
2185 constantTag tag = cp->tag_at(index);
2186 if (!tag.is_double()) {
2187 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2188 }
2189 return cp->double_at(index);
2190 }
2191 JVM_END
2192
2193 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2194 {
2195 JVMWrapper("JVM_ConstantPoolGetStringAt");
2196 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2197 bounds_check(cp, index, CHECK_NULL);
2198 constantTag tag = cp->tag_at(index);
2199 if (!tag.is_string()) {
2200 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2201 }
2202 oop str = cp->string_at(index, CHECK_NULL);
2203 return (jstring) JNIHandles::make_local(str);
2204 }
2205 JVM_END
2206
2207 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2208 {
2209 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2210 JvmtiVMObjectAllocEventCollector oam;
2211 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2212 bounds_check(cp, index, CHECK_NULL);
2213 constantTag tag = cp->tag_at(index);
2214 if (!tag.is_symbol()) {
2215 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2216 }
2217 Symbol* sym = cp->symbol_at(index);
2218 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2219 return (jstring) JNIHandles::make_local(str());
2220 }
2221 JVM_END
2222
2223 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2224 {
2225 JVMWrapper("JVM_ConstantPoolGetTagAt");
2226 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2227 bounds_check(cp, index, CHECK_0);
2228 constantTag tag = cp->tag_at(index);
2229 jbyte result = tag.value();
2230 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2231 // they are changed to the corresponding tags from the JVM spec, so that java code in
2232 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2233 if (tag.is_klass_or_reference()) {
2234 result = JVM_CONSTANT_Class;
2235 } else if (tag.is_string_index()) {
2236 result = JVM_CONSTANT_String;
2237 } else if (tag.is_method_type_in_error()) {
2238 result = JVM_CONSTANT_MethodType;
2239 } else if (tag.is_method_handle_in_error()) {
2240 result = JVM_CONSTANT_MethodHandle;
2241 }
2242 return result;
2243 }
2244 JVM_END
2245
2246 // Assertion support. //////////////////////////////////////////////////////////
2247
2248 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2249 JVMWrapper("JVM_DesiredAssertionStatus");
2250 assert(cls != NULL, "bad class");
2251
2252 oop r = JNIHandles::resolve(cls);
2253 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2254 if (java_lang_Class::is_primitive(r)) return false;
2255
2256 Klass* k = java_lang_Class::as_Klass(r);
2257 assert(k->is_instance_klass(), "must be an instance klass");
2258 if (!k->is_instance_klass()) return false;
2259
2260 ResourceMark rm(THREAD);
2261 const char* name = k->name()->as_C_string();
2262 bool system_class = k->class_loader() == NULL;
2263 return JavaAssertions::enabled(name, system_class);
2264
2265 JVM_END
2266
2267
2268 // Return a new AssertionStatusDirectives object with the fields filled in with
2269 // command-line assertion arguments (i.e., -ea, -da).
2270 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2271 JVMWrapper("JVM_AssertionStatusDirectives");
2272 JvmtiVMObjectAllocEventCollector oam;
2273 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2274 return JNIHandles::make_local(env, asd);
2275 JVM_END
2276
2277 // Verification ////////////////////////////////////////////////////////////////////////////////
2278
2279 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2280
2281 // RedefineClasses support: bug 6214132 caused verification to fail.
2282 // All functions from this section should call the jvmtiThreadSate function:
2283 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2284 // The function returns a Klass* of the _scratch_class if the verifier
2285 // was invoked in the middle of the class redefinition.
2286 // Otherwise it returns its argument value which is the _the_class Klass*.
2287 // Please, refer to the description in the jvmtiThreadSate.hpp.
2288
2289 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2290 JVMWrapper("JVM_GetClassNameUTF");
2291 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2292 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2293 return k->name()->as_utf8();
2294 JVM_END
2295
2296
2297 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2298 JVMWrapper("JVM_GetClassCPTypes");
2299 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2300 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2301 // types will have length zero if this is not an InstanceKlass
2302 // (length is determined by call to JVM_GetClassCPEntriesCount)
2303 if (k->is_instance_klass()) {
2304 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2305 for (int index = cp->length() - 1; index >= 0; index--) {
2306 constantTag tag = cp->tag_at(index);
2307 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2308 }
2309 }
2310 JVM_END
2311
2312
2313 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2314 JVMWrapper("JVM_GetClassCPEntriesCount");
2315 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2316 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2317 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2318 JVM_END
2319
2320
2321 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2322 JVMWrapper("JVM_GetClassFieldsCount");
2323 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2324 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2325 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2326 JVM_END
2327
2328
2329 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2330 JVMWrapper("JVM_GetClassMethodsCount");
2331 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2332 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2333 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2334 JVM_END
2335
2336
2337 // The following methods, used for the verifier, are never called with
2338 // array klasses, so a direct cast to InstanceKlass is safe.
2339 // Typically, these methods are called in a loop with bounds determined
2340 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2341 // zero for arrays.
2342 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2343 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2344 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2345 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2346 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2347 int length = method->checked_exceptions_length();
2348 if (length > 0) {
2349 CheckedExceptionElement* table= method->checked_exceptions_start();
2350 for (int i = 0; i < length; i++) {
2351 exceptions[i] = table[i].class_cp_index;
2352 }
2353 }
2354 JVM_END
2355
2356
2357 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2358 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2359 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2360 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2361 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2362 return method->checked_exceptions_length();
2363 JVM_END
2364
2365
2366 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2367 JVMWrapper("JVM_GetMethodIxByteCode");
2368 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2369 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2370 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2371 memcpy(code, method->code_base(), method->code_size());
2372 JVM_END
2373
2374
2375 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2376 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2377 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2378 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2379 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2380 return method->code_size();
2381 JVM_END
2382
2383
2384 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2385 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2386 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2387 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2388 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2389 ExceptionTable extable(method);
2390 entry->start_pc = extable.start_pc(entry_index);
2391 entry->end_pc = extable.end_pc(entry_index);
2392 entry->handler_pc = extable.handler_pc(entry_index);
2393 entry->catchType = extable.catch_type_index(entry_index);
2394 JVM_END
2395
2396
2397 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2398 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2399 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2400 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2401 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2402 return method->exception_table_length();
2403 JVM_END
2404
2405
2406 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2407 JVMWrapper("JVM_GetMethodIxModifiers");
2408 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2409 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2410 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2411 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2412 JVM_END
2413
2414
2415 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2416 JVMWrapper("JVM_GetFieldIxModifiers");
2417 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2418 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2419 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2420 JVM_END
2421
2422
2423 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2424 JVMWrapper("JVM_GetMethodIxLocalsCount");
2425 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2426 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2427 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2428 return method->max_locals();
2429 JVM_END
2430
2431
2432 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2433 JVMWrapper("JVM_GetMethodIxArgsSize");
2434 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2435 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2436 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2437 return method->size_of_parameters();
2438 JVM_END
2439
2440
2441 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2442 JVMWrapper("JVM_GetMethodIxMaxStack");
2443 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2444 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2445 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2446 return method->verifier_max_stack();
2447 JVM_END
2448
2449
2450 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2451 JVMWrapper("JVM_IsConstructorIx");
2452 ResourceMark rm(THREAD);
2453 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2454 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2455 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2456 return method->name() == vmSymbols::object_initializer_name();
2457 JVM_END
2458
2459
2460 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2461 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2462 ResourceMark rm(THREAD);
2463 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2464 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2465 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2466 return method->is_overpass();
2467 JVM_END
2468
2469 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2470 JVMWrapper("JVM_GetMethodIxIxUTF");
2471 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2472 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2473 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2474 return method->name()->as_utf8();
2475 JVM_END
2476
2477
2478 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2479 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2480 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2481 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2482 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2483 return method->signature()->as_utf8();
2484 JVM_END
2485
2486 /**
2487 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2488 * read entries in the constant pool. Since the old verifier always
2489 * works on a copy of the code, it will not see any rewriting that
2490 * may possibly occur in the middle of verification. So it is important
2491 * that nothing it calls tries to use the cpCache instead of the raw
2492 * constant pool, so we must use cp->uncached_x methods when appropriate.
2493 */
2494 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2495 JVMWrapper("JVM_GetCPFieldNameUTF");
2496 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2497 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2498 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2499 switch (cp->tag_at(cp_index).value()) {
2500 case JVM_CONSTANT_Fieldref:
2501 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2502 default:
2503 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2504 }
2505 ShouldNotReachHere();
2506 return NULL;
2507 JVM_END
2508
2509
2510 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2511 JVMWrapper("JVM_GetCPMethodNameUTF");
2512 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2513 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2514 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2515 switch (cp->tag_at(cp_index).value()) {
2516 case JVM_CONSTANT_InterfaceMethodref:
2517 case JVM_CONSTANT_Methodref:
2518 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2519 default:
2520 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2521 }
2522 ShouldNotReachHere();
2523 return NULL;
2524 JVM_END
2525
2526
2527 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2528 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2529 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2530 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2531 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2532 switch (cp->tag_at(cp_index).value()) {
2533 case JVM_CONSTANT_InterfaceMethodref:
2534 case JVM_CONSTANT_Methodref:
2535 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2536 default:
2537 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2538 }
2539 ShouldNotReachHere();
2540 return NULL;
2541 JVM_END
2542
2543
2544 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2545 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2546 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2547 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2548 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2549 switch (cp->tag_at(cp_index).value()) {
2550 case JVM_CONSTANT_Fieldref:
2551 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2552 default:
2553 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2554 }
2555 ShouldNotReachHere();
2556 return NULL;
2557 JVM_END
2558
2559
2560 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2561 JVMWrapper("JVM_GetCPClassNameUTF");
2562 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2563 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2564 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2565 Symbol* classname = cp->klass_name_at(cp_index);
2566 return classname->as_utf8();
2567 JVM_END
2568
2569
2570 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2571 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2572 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2573 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2574 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2575 switch (cp->tag_at(cp_index).value()) {
2576 case JVM_CONSTANT_Fieldref: {
2577 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2578 Symbol* classname = cp->klass_name_at(class_index);
2579 return classname->as_utf8();
2580 }
2581 default:
2582 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2583 }
2584 ShouldNotReachHere();
2585 return NULL;
2586 JVM_END
2587
2588
2589 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2590 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2591 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2592 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2593 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2594 switch (cp->tag_at(cp_index).value()) {
2595 case JVM_CONSTANT_Methodref:
2596 case JVM_CONSTANT_InterfaceMethodref: {
2597 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2598 Symbol* classname = cp->klass_name_at(class_index);
2599 return classname->as_utf8();
2600 }
2601 default:
2602 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2603 }
2604 ShouldNotReachHere();
2605 return NULL;
2606 JVM_END
2607
2608
2609 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2610 JVMWrapper("JVM_GetCPFieldModifiers");
2611 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2612 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2613 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2614 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2615 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2616 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2617 switch (cp->tag_at(cp_index).value()) {
2618 case JVM_CONSTANT_Fieldref: {
2619 Symbol* name = cp->uncached_name_ref_at(cp_index);
2620 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2621 InstanceKlass* ik = InstanceKlass::cast(k_called);
2622 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2623 if (fs.name() == name && fs.signature() == signature) {
2624 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2625 }
2626 }
2627 return -1;
2628 }
2629 default:
2630 fatal("JVM_GetCPFieldModifiers: illegal constant");
2631 }
2632 ShouldNotReachHere();
2633 return 0;
2634 JVM_END
2635
2636
2637 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2638 JVMWrapper("JVM_GetCPMethodModifiers");
2639 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2640 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2641 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2642 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2643 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2644 switch (cp->tag_at(cp_index).value()) {
2645 case JVM_CONSTANT_Methodref:
2646 case JVM_CONSTANT_InterfaceMethodref: {
2647 Symbol* name = cp->uncached_name_ref_at(cp_index);
2648 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2649 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2650 int methods_count = methods->length();
2651 for (int i = 0; i < methods_count; i++) {
2652 Method* method = methods->at(i);
2653 if (method->name() == name && method->signature() == signature) {
2654 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2655 }
2656 }
2657 return -1;
2658 }
2659 default:
2660 fatal("JVM_GetCPMethodModifiers: illegal constant");
2661 }
2662 ShouldNotReachHere();
2663 return 0;
2664 JVM_END
2665
2666
2667 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2668
2669 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2670 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2671 JVM_END
2672
2673
2674 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2675 JVMWrapper("JVM_IsSameClassPackage");
2676 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2677 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2678 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2679 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2680 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2681 JVM_END
2682
2683 // Printing support //////////////////////////////////////////////////
2684 extern "C" {
2685
2686 ATTRIBUTE_PRINTF(3, 0)
2687 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2688 // see bug 4399518, 4417214
2689 if ((intptr_t)count <= 0) return -1;
2690
2691 int result = vsnprintf(str, count, fmt, args);
2692 // Note: on truncation vsnprintf(3) on Unix returns numbers of
2693 // characters which would have been written had the buffer been large
2694 // enough; on Windows, it returns -1. We handle both cases here and
2695 // always return -1, and perform null termination.
2696 if ((result > 0 && (size_t)result >= count) || result == -1) {
2697 str[count - 1] = '\0';
2698 result = -1;
2699 }
2700
2701 return result;
2702 }
2703
2704 ATTRIBUTE_PRINTF(3, 0)
2705 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2706 va_list args;
2707 int len;
2708 va_start(args, fmt);
2709 len = jio_vsnprintf(str, count, fmt, args);
2710 va_end(args);
2711 return len;
2712 }
2713
2714 ATTRIBUTE_PRINTF(2,3)
2715 int jio_fprintf(FILE* f, const char *fmt, ...) {
2716 int len;
2717 va_list args;
2718 va_start(args, fmt);
2719 len = jio_vfprintf(f, fmt, args);
2720 va_end(args);
2721 return len;
2722 }
2723
2724 ATTRIBUTE_PRINTF(2, 0)
2725 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2726 if (Arguments::vfprintf_hook() != NULL) {
2727 return Arguments::vfprintf_hook()(f, fmt, args);
2728 } else {
2729 return vfprintf(f, fmt, args);
2730 }
2731 }
2732
2733 ATTRIBUTE_PRINTF(1, 2)
2734 JNIEXPORT int jio_printf(const char *fmt, ...) {
2735 int len;
2736 va_list args;
2737 va_start(args, fmt);
2738 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2739 va_end(args);
2740 return len;
2741 }
2742
2743
2744 // HotSpot specific jio method
2745 void jio_print(const char* s) {
2746 // Try to make this function as atomic as possible.
2747 if (Arguments::vfprintf_hook() != NULL) {
2748 jio_fprintf(defaultStream::output_stream(), "%s", s);
2749 } else {
2750 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2751 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2752 }
2753 }
2754
2755 } // Extern C
2756
2757 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2758
2759 // In most of the JVM thread support functions we need to access the
2760 // thread through a ThreadsListHandle to prevent it from exiting and
2761 // being reclaimed while we try to operate on it. The exceptions to this
2762 // rule are when operating on the current thread, or if the monitor of
2763 // the target java.lang.Thread is locked at the Java level - in both
2764 // cases the target cannot exit.
2765
2766 static void thread_entry(JavaThread* thread, TRAPS) {
2767 HandleMark hm(THREAD);
2768 Handle obj(THREAD, thread->threadObj());
2769 JavaValue result(T_VOID);
2770 JavaCalls::call_virtual(&result,
2771 obj,
2772 SystemDictionary::Thread_klass(),
2773 vmSymbols::run_method_name(),
2774 vmSymbols::void_method_signature(),
2775 THREAD);
2776 }
2777
2778
2779 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2780 JVMWrapper("JVM_StartThread");
2781 JavaThread *native_thread = NULL;
2782
2783 // We cannot hold the Threads_lock when we throw an exception,
2784 // due to rank ordering issues. Example: we might need to grab the
2785 // Heap_lock while we construct the exception.
2786 bool throw_illegal_thread_state = false;
2787
2788 // We must release the Threads_lock before we can post a jvmti event
2789 // in Thread::start.
2790 {
2791 // Ensure that the C++ Thread and OSThread structures aren't freed before
2792 // we operate.
2793 MutexLocker mu(Threads_lock);
2794
2795 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2796 // re-starting an already started thread, so we should usually find
2797 // that the JavaThread is null. However for a JNI attached thread
2798 // there is a small window between the Thread object being created
2799 // (with its JavaThread set) and the update to its threadStatus, so we
2800 // have to check for this
2801 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2802 throw_illegal_thread_state = true;
2803 } else {
2804 // We could also check the stillborn flag to see if this thread was already stopped, but
2805 // for historical reasons we let the thread detect that itself when it starts running
2806
2807 jlong size =
2808 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2809 // Allocate the C++ Thread structure and create the native thread. The
2810 // stack size retrieved from java is 64-bit signed, but the constructor takes
2811 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2812 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2813 // - Avoid passing negative values which would result in really large stacks.
2814 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2815 size_t sz = size > 0 ? (size_t) size : 0;
2816 native_thread = new JavaThread(&thread_entry, sz);
2817
2818 // At this point it may be possible that no osthread was created for the
2819 // JavaThread due to lack of memory. Check for this situation and throw
2820 // an exception if necessary. Eventually we may want to change this so
2821 // that we only grab the lock if the thread was created successfully -
2822 // then we can also do this check and throw the exception in the
2823 // JavaThread constructor.
2824 if (native_thread->osthread() != NULL) {
2825 // Note: the current thread is not being used within "prepare".
2826 native_thread->prepare(jthread);
2827 }
2828 }
2829 }
2830
2831 if (throw_illegal_thread_state) {
2832 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2833 }
2834
2835 assert(native_thread != NULL, "Starting null thread?");
2836
2837 if (native_thread->osthread() == NULL) {
2838 // No one should hold a reference to the 'native_thread'.
2839 native_thread->smr_delete();
2840 if (JvmtiExport::should_post_resource_exhausted()) {
2841 JvmtiExport::post_resource_exhausted(
2842 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2843 os::native_thread_creation_failed_msg());
2844 }
2845 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2846 os::native_thread_creation_failed_msg());
2847 }
2848
2849 Thread::start(native_thread);
2850
2851 JVM_END
2852
2853
2854 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2855 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2856 // but is thought to be reliable and simple. In the case, where the receiver is the
2857 // same thread as the sender, no VM_Operation is needed.
2858 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2859 JVMWrapper("JVM_StopThread");
2860
2861 // A nested ThreadsListHandle will grab the Threads_lock so create
2862 // tlh before we resolve throwable.
2863 ThreadsListHandle tlh(thread);
2864 oop java_throwable = JNIHandles::resolve(throwable);
2865 if (java_throwable == NULL) {
2866 THROW(vmSymbols::java_lang_NullPointerException());
2867 }
2868 oop java_thread = NULL;
2869 JavaThread* receiver = NULL;
2870 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2871 Events::log_exception(thread,
2872 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2873 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2874
2875 if (is_alive) {
2876 // jthread refers to a live JavaThread.
2877 if (thread == receiver) {
2878 // Exception is getting thrown at self so no VM_Operation needed.
2879 THROW_OOP(java_throwable);
2880 } else {
2881 // Use a VM_Operation to throw the exception.
2882 Thread::send_async_exception(java_thread, java_throwable);
2883 }
2884 } else {
2885 // Either:
2886 // - target thread has not been started before being stopped, or
2887 // - target thread already terminated
2888 // We could read the threadStatus to determine which case it is
2889 // but that is overkill as it doesn't matter. We must set the
2890 // stillborn flag for the first case, and if the thread has already
2891 // exited setting this flag has no effect.
2892 java_lang_Thread::set_stillborn(java_thread);
2893 }
2894 JVM_END
2895
2896
2897 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2898 JVMWrapper("JVM_IsThreadAlive");
2899
2900 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2901 return java_lang_Thread::is_alive(thread_oop);
2902 JVM_END
2903
2904
2905 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2906 JVMWrapper("JVM_SuspendThread");
2907
2908 ThreadsListHandle tlh(thread);
2909 JavaThread* receiver = NULL;
2910 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2911 if (is_alive) {
2912 // jthread refers to a live JavaThread.
2913 {
2914 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2915 if (receiver->is_external_suspend()) {
2916 // Don't allow nested external suspend requests. We can't return
2917 // an error from this interface so just ignore the problem.
2918 return;
2919 }
2920 if (receiver->is_exiting()) { // thread is in the process of exiting
2921 return;
2922 }
2923 receiver->set_external_suspend();
2924 }
2925
2926 // java_suspend() will catch threads in the process of exiting
2927 // and will ignore them.
2928 receiver->java_suspend();
2929
2930 // It would be nice to have the following assertion in all the
2931 // time, but it is possible for a racing resume request to have
2932 // resumed this thread right after we suspended it. Temporarily
2933 // enable this assertion if you are chasing a different kind of
2934 // bug.
2935 //
2936 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2937 // receiver->is_being_ext_suspended(), "thread is not suspended");
2938 }
2939 JVM_END
2940
2941
2942 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2943 JVMWrapper("JVM_ResumeThread");
2944
2945 ThreadsListHandle tlh(thread);
2946 JavaThread* receiver = NULL;
2947 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2948 if (is_alive) {
2949 // jthread refers to a live JavaThread.
2950
2951 // This is the original comment for this Threads_lock grab:
2952 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2953 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2954 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2955 // looks at it.
2956 //
2957 // The above comment dates back to when we had both internal and
2958 // external suspend APIs that shared a common underlying mechanism.
2959 // External suspend is now entirely cooperative and doesn't share
2960 // anything with internal suspend. That said, there are some
2961 // assumptions in the VM that an external resume grabs the
2962 // Threads_lock. We can't drop the Threads_lock grab here until we
2963 // resolve the assumptions that exist elsewhere.
2964 //
2965 MutexLocker ml(Threads_lock);
2966 receiver->java_resume();
2967 }
2968 JVM_END
2969
2970
2971 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2972 JVMWrapper("JVM_SetThreadPriority");
2973
2974 ThreadsListHandle tlh(thread);
2975 oop java_thread = NULL;
2976 JavaThread* receiver = NULL;
2977 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2978 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2979
2980 if (is_alive) {
2981 // jthread refers to a live JavaThread.
2982 Thread::set_priority(receiver, (ThreadPriority)prio);
2983 }
2984 // Implied else: If the JavaThread hasn't started yet, then the
2985 // priority set in the java.lang.Thread object above will be pushed
2986 // down when it does start.
2987 JVM_END
2988
2989
2990 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2991 JVMWrapper("JVM_Yield");
2992 if (os::dont_yield()) return;
2993 HOTSPOT_THREAD_YIELD();
2994 os::naked_yield();
2995 JVM_END
2996
2997
2998 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2999 JVMWrapper("JVM_Sleep");
3000
3001 if (millis < 0) {
3002 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3003 }
3004
3005 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3006 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3007 }
3008
3009 // Save current thread state and restore it at the end of this block.
3010 // And set new thread state to SLEEPING.
3011 JavaThreadSleepState jtss(thread);
3012
3013 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3014
3015 EventThreadSleep event;
3016
3017 if (millis == 0) {
3018 os::naked_yield();
3019 } else {
3020 ThreadState old_state = thread->osthread()->get_state();
3021 thread->osthread()->set_state(SLEEPING);
3022 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3023 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3024 // us while we were sleeping. We do not overwrite those.
3025 if (!HAS_PENDING_EXCEPTION) {
3026 if (event.should_commit()) {
3027 event.set_time(millis);
3028 event.commit();
3029 }
3030 HOTSPOT_THREAD_SLEEP_END(1);
3031
3032 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3033 // to properly restore the thread state. That's likely wrong.
3034 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3035 }
3036 }
3037 thread->osthread()->set_state(old_state);
3038 }
3039 if (event.should_commit()) {
3040 event.set_time(millis);
3041 event.commit();
3042 }
3043 HOTSPOT_THREAD_SLEEP_END(0);
3044 JVM_END
3045
3046 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3047 JVMWrapper("JVM_CurrentThread");
3048 oop jthread = thread->threadObj();
3049 assert (thread != NULL, "no current thread!");
3050 return JNIHandles::make_local(env, jthread);
3051 JVM_END
3052
3053
3054 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3055 JVMWrapper("JVM_CountStackFrames");
3056
3057 uint32_t debug_bits = 0;
3058 ThreadsListHandle tlh(thread);
3059 JavaThread* receiver = NULL;
3060 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3061 int count = 0;
3062 if (is_alive) {
3063 // jthread refers to a live JavaThread.
3064 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
3065 // Count all java activation, i.e., number of vframes.
3066 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) {
3067 // Native frames are not counted.
3068 if (!vfst.method()->is_native()) count++;
3069 }
3070 } else {
3071 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3072 "this thread is not suspended");
3073 }
3074 }
3075 // Implied else: if JavaThread is not alive simply return a count of 0.
3076
3077 return count;
3078 JVM_END
3079
3080
3081 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3082 JVMWrapper("JVM_Interrupt");
3083
3084 ThreadsListHandle tlh(thread);
3085 JavaThread* receiver = NULL;
3086 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3087 if (is_alive) {
3088 // jthread refers to a live JavaThread.
3089 Thread::interrupt(receiver);
3090 }
3091 JVM_END
3092
3093
3094 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3095 JVMWrapper("JVM_IsInterrupted");
3096
3097 ThreadsListHandle tlh(thread);
3098 JavaThread* receiver = NULL;
3099 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3100 if (is_alive) {
3101 // jthread refers to a live JavaThread.
3102 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3103 } else {
3104 return JNI_FALSE;
3105 }
3106 JVM_END
3107
3108
3109 // Return true iff the current thread has locked the object passed in
3110
3111 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3112 JVMWrapper("JVM_HoldsLock");
3113 assert(THREAD->is_Java_thread(), "sanity check");
3114 if (obj == NULL) {
3115 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3116 }
3117 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3118 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3119 JVM_END
3120
3121
3122 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3123 JVMWrapper("JVM_DumpAllStacks");
3124 VM_PrintThreads op;
3125 VMThread::execute(&op);
3126 if (JvmtiExport::should_post_data_dump()) {
3127 JvmtiExport::post_data_dump();
3128 }
3129 JVM_END
3130
3131 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3132 JVMWrapper("JVM_SetNativeThreadName");
3133
3134 // We don't use a ThreadsListHandle here because the current thread
3135 // must be alive.
3136 oop java_thread = JNIHandles::resolve_non_null(jthread);
3137 JavaThread* thr = java_lang_Thread::thread(java_thread);
3138 if (thread == thr && !thr->has_attached_via_jni()) {
3139 // Thread naming is only supported for the current thread and
3140 // we don't set the name of an attached thread to avoid stepping
3141 // on other programs.
3142 ResourceMark rm(thread);
3143 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3144 os::set_native_thread_name(thread_name);
3145 }
3146 JVM_END
3147
3148 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3149
3150 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3151 assert(jthread->is_Java_thread(), "must be a Java thread");
3152 if (jthread->privileged_stack_top() == NULL) return false;
3153 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3154 oop loader = jthread->privileged_stack_top()->class_loader();
3155 if (loader == NULL) return true;
3156 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3157 if (trusted) return true;
3158 }
3159 return false;
3160 }
3161
3162 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3163 JVMWrapper("JVM_CurrentLoadedClass");
3164 ResourceMark rm(THREAD);
3165
3166 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3167 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3168 bool trusted = is_trusted_frame(thread, &vfst);
3169 if (trusted) return NULL;
3170
3171 Method* m = vfst.method();
3172 if (!m->is_native()) {
3173 InstanceKlass* holder = m->method_holder();
3174 oop loader = holder->class_loader();
3175 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3176 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3177 }
3178 }
3179 }
3180 return NULL;
3181 JVM_END
3182
3183
3184 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3185 JVMWrapper("JVM_CurrentClassLoader");
3186 ResourceMark rm(THREAD);
3187
3188 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3189
3190 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3191 bool trusted = is_trusted_frame(thread, &vfst);
3192 if (trusted) return NULL;
3193
3194 Method* m = vfst.method();
3195 if (!m->is_native()) {
3196 InstanceKlass* holder = m->method_holder();
3197 assert(holder->is_klass(), "just checking");
3198 oop loader = holder->class_loader();
3199 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3200 return JNIHandles::make_local(env, loader);
3201 }
3202 }
3203 }
3204 return NULL;
3205 JVM_END
3206
3207
3208 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3209 JVMWrapper("JVM_GetClassContext");
3210 ResourceMark rm(THREAD);
3211 JvmtiVMObjectAllocEventCollector oam;
3212 vframeStream vfst(thread);
3213
3214 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3215 // This must only be called from SecurityManager.getClassContext
3216 Method* m = vfst.method();
3217 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3218 m->name() == vmSymbols::getClassContext_name() &&
3219 m->signature() == vmSymbols::void_class_array_signature())) {
3220 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3221 }
3222 }
3223
3224 // Collect method holders
3225 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3226 for (; !vfst.at_end(); vfst.security_next()) {
3227 Method* m = vfst.method();
3228 // Native frames are not returned
3229 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3230 Klass* holder = m->method_holder();
3231 assert(holder->is_klass(), "just checking");
3232 klass_array->append(holder);
3233 }
3234 }
3235
3236 // Create result array of type [Ljava/lang/Class;
3237 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3238 // Fill in mirrors corresponding to method holders
3239 for (int i = 0; i < klass_array->length(); i++) {
3240 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3241 }
3242
3243 return (jobjectArray) JNIHandles::make_local(env, result);
3244 JVM_END
3245
3246
3247 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3248 JVMWrapper("JVM_ClassDepth");
3249 ResourceMark rm(THREAD);
3250 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3251 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3252
3253 const char* str = java_lang_String::as_utf8_string(class_name_str());
3254 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3255 if (class_name_sym == NULL) {
3256 return -1;
3257 }
3258
3259 int depth = 0;
3260
3261 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3262 if (!vfst.method()->is_native()) {
3263 InstanceKlass* holder = vfst.method()->method_holder();
3264 assert(holder->is_klass(), "just checking");
3265 if (holder->name() == class_name_sym) {
3266 return depth;
3267 }
3268 depth++;
3269 }
3270 }
3271 return -1;
3272 JVM_END
3273
3274
3275 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3276 JVMWrapper("JVM_ClassLoaderDepth");
3277 ResourceMark rm(THREAD);
3278 int depth = 0;
3279 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3280 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3281 bool trusted = is_trusted_frame(thread, &vfst);
3282 if (trusted) return -1;
3283
3284 Method* m = vfst.method();
3285 if (!m->is_native()) {
3286 InstanceKlass* holder = m->method_holder();
3287 assert(holder->is_klass(), "just checking");
3288 oop loader = holder->class_loader();
3289 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3290 return depth;
3291 }
3292 depth++;
3293 }
3294 }
3295 return -1;
3296 JVM_END
3297
3298
3299 // java.lang.Package ////////////////////////////////////////////////////////////////
3300
3301
3302 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3303 JVMWrapper("JVM_GetSystemPackage");
3304 ResourceMark rm(THREAD);
3305 JvmtiVMObjectAllocEventCollector oam;
3306 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3307 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3308 return (jstring) JNIHandles::make_local(result);
3309 JVM_END
3310
3311
3312 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3313 JVMWrapper("JVM_GetSystemPackages");
3314 JvmtiVMObjectAllocEventCollector oam;
3315 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3316 return (jobjectArray) JNIHandles::make_local(result);
3317 JVM_END
3318
3319
3320 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3321
3322
3323 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3324 JVMWrapper("JVM_GetAndClearReferencePendingList");
3325
3326 MonitorLockerEx ml(Heap_lock);
3327 oop ref = Universe::reference_pending_list();
3328 if (ref != NULL) {
3329 Universe::set_reference_pending_list(NULL);
3330 }
3331 return JNIHandles::make_local(env, ref);
3332 JVM_END
3333
3334 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3335 JVMWrapper("JVM_HasReferencePendingList");
3336 MonitorLockerEx ml(Heap_lock);
3337 return Universe::has_reference_pending_list();
3338 JVM_END
3339
3340 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3341 JVMWrapper("JVM_WaitForReferencePendingList");
3342 MonitorLockerEx ml(Heap_lock);
3343 while (!Universe::has_reference_pending_list()) {
3344 ml.wait();
3345 }
3346 JVM_END
3347
3348
3349 // ObjectInputStream ///////////////////////////////////////////////////////////////
3350
3351 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3352 if (current_class == NULL) {
3353 return true;
3354 }
3355 if ((current_class == field_class) || access.is_public()) {
3356 return true;
3357 }
3358
3359 if (access.is_protected()) {
3360 // See if current_class is a subclass of field_class
3361 if (current_class->is_subclass_of(field_class)) {
3362 return true;
3363 }
3364 }
3365
3366 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3367 }
3368
3369 // Return the first user-defined class loader up the execution stack, or null
3370 // if only code from the bootstrap or platform class loader is on the stack.
3371
3372 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3373 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3374 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3375 oop loader = vfst.method()->method_holder()->class_loader();
3376 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3377 return JNIHandles::make_local(env, loader);
3378 }
3379 }
3380 return NULL;
3381 JVM_END
3382
3383
3384 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3385
3386
3387 // resolve array handle and check arguments
3388 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3389 if (arr == NULL) {
3390 THROW_0(vmSymbols::java_lang_NullPointerException());
3391 }
3392 oop a = JNIHandles::resolve_non_null(arr);
3393 if (!a->is_array()) {
3394 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3395 } else if (type_array_only && !a->is_typeArray()) {
3396 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3397 }
3398 return arrayOop(a);
3399 }
3400
3401
3402 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3403 JVMWrapper("JVM_GetArrayLength");
3404 arrayOop a = check_array(env, arr, false, CHECK_0);
3405 return a->length();
3406 JVM_END
3407
3408
3409 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3410 JVMWrapper("JVM_Array_Get");
3411 JvmtiVMObjectAllocEventCollector oam;
3412 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3413 jvalue value;
3414 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3415 oop box = Reflection::box(&value, type, CHECK_NULL);
3416 return JNIHandles::make_local(env, box);
3417 JVM_END
3418
3419
3420 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3421 JVMWrapper("JVM_GetPrimitiveArrayElement");
3422 jvalue value;
3423 value.i = 0; // to initialize value before getting used in CHECK
3424 arrayOop a = check_array(env, arr, true, CHECK_(value));
3425 assert(a->is_typeArray(), "just checking");
3426 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3427 BasicType wide_type = (BasicType) wCode;
3428 if (type != wide_type) {
3429 Reflection::widen(&value, type, wide_type, CHECK_(value));
3430 }
3431 return value;
3432 JVM_END
3433
3434
3435 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3436 JVMWrapper("JVM_SetArrayElement");
3437 arrayOop a = check_array(env, arr, false, CHECK);
3438 oop box = JNIHandles::resolve(val);
3439 jvalue value;
3440 value.i = 0; // to initialize value before getting used in CHECK
3441 BasicType value_type;
3442 if (a->is_objArray()) {
3443 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3444 value_type = Reflection::unbox_for_regular_object(box, &value);
3445 } else {
3446 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3447 }
3448 Reflection::array_set(&value, a, index, value_type, CHECK);
3449 JVM_END
3450
3451
3452 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3453 JVMWrapper("JVM_SetPrimitiveArrayElement");
3454 arrayOop a = check_array(env, arr, true, CHECK);
3455 assert(a->is_typeArray(), "just checking");
3456 BasicType value_type = (BasicType) vCode;
3457 Reflection::array_set(&v, a, index, value_type, CHECK);
3458 JVM_END
3459
3460
3461 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3462 JVMWrapper("JVM_NewArray");
3463 JvmtiVMObjectAllocEventCollector oam;
3464 oop element_mirror = JNIHandles::resolve(eltClass);
3465 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3466 return JNIHandles::make_local(env, result);
3467 JVM_END
3468
3469
3470 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3471 JVMWrapper("JVM_NewMultiArray");
3472 JvmtiVMObjectAllocEventCollector oam;
3473 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3474 oop element_mirror = JNIHandles::resolve(eltClass);
3475 assert(dim_array->is_typeArray(), "just checking");
3476 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3477 return JNIHandles::make_local(env, result);
3478 JVM_END
3479
3480
3481 // Library support ///////////////////////////////////////////////////////////////////////////
3482
3483 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3484 //%note jvm_ct
3485 JVMWrapper("JVM_LoadLibrary");
3486 char ebuf[1024];
3487 void *load_result;
3488 {
3489 ThreadToNativeFromVM ttnfvm(thread);
3490 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3491 }
3492 if (load_result == NULL) {
3493 char msg[1024];
3494 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3495 // Since 'ebuf' may contain a string encoded using
3496 // platform encoding scheme, we need to pass
3497 // Exceptions::unsafe_to_utf8 to the new_exception method
3498 // as the last argument. See bug 6367357.
3499 Handle h_exception =
3500 Exceptions::new_exception(thread,
3501 vmSymbols::java_lang_UnsatisfiedLinkError(),
3502 msg, Exceptions::unsafe_to_utf8);
3503
3504 THROW_HANDLE_0(h_exception);
3505 }
3506 return load_result;
3507 JVM_END
3508
3509
3510 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3511 JVMWrapper("JVM_UnloadLibrary");
3512 os::dll_unload(handle);
3513 JVM_END
3514
3515
3516 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3517 JVMWrapper("JVM_FindLibraryEntry");
3518 return os::dll_lookup(handle, name);
3519 JVM_END
3520
3521
3522 // JNI version ///////////////////////////////////////////////////////////////////////////////
3523
3524 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3525 JVMWrapper("JVM_IsSupportedJNIVersion");
3526 return Threads::is_supported_jni_version_including_1_1(version);
3527 JVM_END
3528
3529
3530 // String support ///////////////////////////////////////////////////////////////////////////
3531
3532 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3533 JVMWrapper("JVM_InternString");
3534 JvmtiVMObjectAllocEventCollector oam;
3535 if (str == NULL) return NULL;
3536 oop string = JNIHandles::resolve_non_null(str);
3537 oop result = StringTable::intern(string, CHECK_NULL);
3538 return (jstring) JNIHandles::make_local(env, result);
3539 JVM_END
3540
3541
3542 // Raw monitor support //////////////////////////////////////////////////////////////////////
3543
3544 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3545 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3546 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3547 // that only works with java threads.
3548
3549
3550 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3551 VM_Exit::block_if_vm_exited();
3552 JVMWrapper("JVM_RawMonitorCreate");
3553 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3554 }
3555
3556
3557 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3558 VM_Exit::block_if_vm_exited();
3559 JVMWrapper("JVM_RawMonitorDestroy");
3560 delete ((Mutex*) mon);
3561 }
3562
3563
3564 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3565 VM_Exit::block_if_vm_exited();
3566 JVMWrapper("JVM_RawMonitorEnter");
3567 ((Mutex*) mon)->jvm_raw_lock();
3568 return 0;
3569 }
3570
3571
3572 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3573 VM_Exit::block_if_vm_exited();
3574 JVMWrapper("JVM_RawMonitorExit");
3575 ((Mutex*) mon)->jvm_raw_unlock();
3576 }
3577
3578
3579 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3580
3581 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3582 Handle loader, Handle protection_domain,
3583 jboolean throwError, TRAPS) {
3584 // Security Note:
3585 // The Java level wrapper will perform the necessary security check allowing
3586 // us to pass the NULL as the initiating class loader. The VM is responsible for
3587 // the checkPackageAccess relative to the initiating class loader via the
3588 // protection_domain. The protection_domain is passed as NULL by the java code
3589 // if there is no security manager in 3-arg Class.forName().
3590 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3591
3592 // Check if we should initialize the class
3593 if (init && klass->is_instance_klass()) {
3594 klass->initialize(CHECK_NULL);
3595 }
3596 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3597 }
3598
3599
3600 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3601
3602 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3603 JVMWrapper("JVM_InvokeMethod");
3604 Handle method_handle;
3605 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3606 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3607 Handle receiver(THREAD, JNIHandles::resolve(obj));
3608 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3609 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3610 jobject res = JNIHandles::make_local(env, result);
3611 if (JvmtiExport::should_post_vm_object_alloc()) {
3612 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3613 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3614 if (java_lang_Class::is_primitive(ret_type)) {
3615 // Only for primitive type vm allocates memory for java object.
3616 // See box() method.
3617 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3618 }
3619 }
3620 return res;
3621 } else {
3622 THROW_0(vmSymbols::java_lang_StackOverflowError());
3623 }
3624 JVM_END
3625
3626
3627 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3628 JVMWrapper("JVM_NewInstanceFromConstructor");
3629 oop constructor_mirror = JNIHandles::resolve(c);
3630 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3631 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3632 jobject res = JNIHandles::make_local(env, result);
3633 if (JvmtiExport::should_post_vm_object_alloc()) {
3634 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3635 }
3636 return res;
3637 JVM_END
3638
3639 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3640
3641 JVM_LEAF(jboolean, JVM_SupportsCX8())
3642 JVMWrapper("JVM_SupportsCX8");
3643 return VM_Version::supports_cx8();
3644 JVM_END
3645
3646 // Returns an array of all live Thread objects (VM internal JavaThreads,
3647 // jvmti agent threads, and JNI attaching threads are skipped)
3648 // See CR 6404306 regarding JNI attaching threads
3649 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3650 ResourceMark rm(THREAD);
3651 ThreadsListEnumerator tle(THREAD, false, false);
3652 JvmtiVMObjectAllocEventCollector oam;
3653
3654 int num_threads = tle.num_threads();
3655 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3656 objArrayHandle threads_ah(THREAD, r);
3657
3658 for (int i = 0; i < num_threads; i++) {
3659 Handle h = tle.get_threadObj(i);
3660 threads_ah->obj_at_put(i, h());
3661 }
3662
3663 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3664 JVM_END
3665
3666
3667 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3668 // Return StackTraceElement[][], each element is the stack trace of a thread in
3669 // the corresponding entry in the given threads array
3670 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3671 JVMWrapper("JVM_DumpThreads");
3672 JvmtiVMObjectAllocEventCollector oam;
3673
3674 // Check if threads is null
3675 if (threads == NULL) {
3676 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3677 }
3678
3679 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3680 objArrayHandle ah(THREAD, a);
3681 int num_threads = ah->length();
3682 // check if threads is non-empty array
3683 if (num_threads == 0) {
3684 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3685 }
3686
3687 // check if threads is not an array of objects of Thread class
3688 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3689 if (k != SystemDictionary::Thread_klass()) {
3690 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3691 }
3692
3693 ResourceMark rm(THREAD);
3694
3695 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3696 for (int i = 0; i < num_threads; i++) {
3697 oop thread_obj = ah->obj_at(i);
3698 instanceHandle h(THREAD, (instanceOop) thread_obj);
3699 thread_handle_array->append(h);
3700 }
3701
3702 // The JavaThread references in thread_handle_array are validated
3703 // in VM_ThreadDump::doit().
3704 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3705 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3706
3707 JVM_END
3708
3709 // JVM monitoring and management support
3710 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3711 return Management::get_jmm_interface(version);
3712 JVM_END
3713
3714 // com.sun.tools.attach.VirtualMachine agent properties support
3715 //
3716 // Initialize the agent properties with the properties maintained in the VM
3717 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3718 JVMWrapper("JVM_InitAgentProperties");
3719 ResourceMark rm;
3720
3721 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3722
3723 PUTPROP(props, "sun.java.command", Arguments::java_command());
3724 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3725 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3726 return properties;
3727 JVM_END
3728
3729 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3730 {
3731 JVMWrapper("JVM_GetEnclosingMethodInfo");
3732 JvmtiVMObjectAllocEventCollector oam;
3733
3734 if (ofClass == NULL) {
3735 return NULL;
3736 }
3737 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3738 // Special handling for primitive objects
3739 if (java_lang_Class::is_primitive(mirror())) {
3740 return NULL;
3741 }
3742 Klass* k = java_lang_Class::as_Klass(mirror());
3743 if (!k->is_instance_klass()) {
3744 return NULL;
3745 }
3746 InstanceKlass* ik = InstanceKlass::cast(k);
3747 int encl_method_class_idx = ik->enclosing_method_class_index();
3748 if (encl_method_class_idx == 0) {
3749 return NULL;
3750 }
3751 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3752 objArrayHandle dest(THREAD, dest_o);
3753 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3754 dest->obj_at_put(0, enc_k->java_mirror());
3755 int encl_method_method_idx = ik->enclosing_method_method_index();
3756 if (encl_method_method_idx != 0) {
3757 Symbol* sym = ik->constants()->symbol_at(
3758 extract_low_short_from_int(
3759 ik->constants()->name_and_type_at(encl_method_method_idx)));
3760 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3761 dest->obj_at_put(1, str());
3762 sym = ik->constants()->symbol_at(
3763 extract_high_short_from_int(
3764 ik->constants()->name_and_type_at(encl_method_method_idx)));
3765 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3766 dest->obj_at_put(2, str());
3767 }
3768 return (jobjectArray) JNIHandles::make_local(dest());
3769 }
3770 JVM_END
3771
3772 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3773 {
3774 memset(info, 0, info_size);
3775
3776 info->jvm_version = Abstract_VM_Version::jvm_version();
3777 info->patch_version = Abstract_VM_Version::vm_patch_version();
3778
3779 // when we add a new capability in the jvm_version_info struct, we should also
3780 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3781 // counter defined in runtimeService.cpp.
3782 info->is_attachable = AttachListener::is_attach_supported();
3783 }
3784 JVM_END
3785
3786 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3787 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3788 ResourceMark rm(THREAD);
3789
3790 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3791 return NULL;
3792 }
3793
3794 char** vm_flags = Arguments::jvm_flags_array();
3795 char** vm_args = Arguments::jvm_args_array();
3796 int num_flags = Arguments::num_jvm_flags();
3797 int num_args = Arguments::num_jvm_args();
3798
3799 InstanceKlass* ik = SystemDictionary::String_klass();
3800 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3801 objArrayHandle result_h(THREAD, r);
3802
3803 int index = 0;
3804 for (int j = 0; j < num_flags; j++, index++) {
3805 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3806 result_h->obj_at_put(index, h());
3807 }
3808 for (int i = 0; i < num_args; i++, index++) {
3809 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3810 result_h->obj_at_put(index, h());
3811 }
3812 return (jobjectArray) JNIHandles::make_local(env, result_h());
3813 JVM_END
3814
3815 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3816 return os::get_signal_number(name);
3817 JVM_END