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/vframe.hpp"
70 #include "runtime/vm_operations.hpp"
71 #include "runtime/vm_version.hpp"
72 #include "services/attachListener.hpp"
73 #include "services/management.hpp"
74 #include "services/threadService.hpp"
75 #include "trace/tracing.hpp"
76 #include "utilities/copy.hpp"
77 #include "utilities/defaultStream.hpp"
78 #include "utilities/dtrace.hpp"
79 #include "utilities/events.hpp"
80 #include "utilities/histogram.hpp"
81 #include "utilities/macros.hpp"
82 #include "utilities/utf8.hpp"
83 #if INCLUDE_CDS
84 #include "classfile/sharedClassUtil.hpp"
85 #include "classfile/systemDictionaryShared.hpp"
86 #endif
87
88 #include <errno.h>
89
90 /*
91 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
92 such ctors and calls MUST NOT come between an oop declaration/init and its
93 usage because if objects are move this may cause various memory stomps, bus
94 errors and segfaults. Here is a cookbook for causing so called "naked oop
95 failures":
96
97 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
98 JVMWrapper("JVM_GetClassDeclaredFields");
99
100 // Object address to be held directly in mirror & not visible to GC
101 oop mirror = JNIHandles::resolve_non_null(ofClass);
102
103 // If this ctor can hit a safepoint, moving objects around, then
104 ComplexConstructor foo;
105
106 // Boom! mirror may point to JUNK instead of the intended object
107 (some dereference of mirror)
108
109 // Here's another call that may block for GC, making mirror stale
110 MutexLocker ml(some_lock);
111
112 // And here's an initializer that can result in a stale oop
113 // all in one step.
114 oop o = call_that_can_throw_exception(TRAPS);
115
116
117 The solution is to keep the oop declaration BELOW the ctor or function
118 call that might cause a GC, do another resolve to reassign the oop, or
119 consider use of a Handle instead of an oop so there is immunity from object
120 motion. But note that the "QUICK" entries below do not have a handlemark
121 and thus can only support use of handles passed in.
122 */
123
124 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
125 ResourceMark rm;
126 int line_number = -1;
127 const char * source_file = NULL;
128 const char * trace = "explicit";
129 InstanceKlass* caller = NULL;
130 JavaThread* jthread = JavaThread::current();
131 if (jthread->has_last_Java_frame()) {
132 vframeStream vfst(jthread);
133
134 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
135 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
136 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
137 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
138 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
139
140 Method* last_caller = NULL;
141
142 while (!vfst.at_end()) {
143 Method* m = vfst.method();
144 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
145 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
146 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
147 break;
148 }
149 last_caller = m;
150 vfst.next();
151 }
152 // if this is called from Class.forName0 and that is called from Class.forName,
153 // then print the caller of Class.forName. If this is Class.loadClass, then print
154 // that caller, otherwise keep quiet since this should be picked up elsewhere.
155 bool found_it = false;
156 if (!vfst.at_end() &&
157 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
158 vfst.method()->name() == vmSymbols::forName0_name()) {
159 vfst.next();
160 if (!vfst.at_end() &&
161 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
162 vfst.method()->name() == vmSymbols::forName_name()) {
163 vfst.next();
164 found_it = true;
165 }
166 } else if (last_caller != NULL &&
167 last_caller->method_holder()->name() ==
168 vmSymbols::java_lang_ClassLoader() &&
169 (last_caller->name() == vmSymbols::loadClassInternal_name() ||
170 last_caller->name() == vmSymbols::loadClass_name())) {
171 found_it = true;
172 } else if (!vfst.at_end()) {
173 if (vfst.method()->is_native()) {
174 // JNI call
175 found_it = true;
176 }
177 }
178 if (found_it && !vfst.at_end()) {
179 // found the caller
180 caller = vfst.method()->method_holder();
181 line_number = vfst.method()->line_number_from_bci(vfst.bci());
182 if (line_number == -1) {
183 // show method name if it's a native method
184 trace = vfst.method()->name_and_sig_as_C_string();
185 }
186 Symbol* s = caller->source_file_name();
187 if (s != NULL) {
188 source_file = s->as_C_string();
189 }
190 }
191 }
192 if (caller != NULL) {
193 if (to_class != caller) {
194 const char * from = caller->external_name();
195 const char * to = to_class->external_name();
196 // print in a single call to reduce interleaving between threads
197 if (source_file != NULL) {
198 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
199 } else {
200 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
201 }
202 }
203 }
204 }
205
206 void trace_class_resolution(Klass* to_class) {
207 EXCEPTION_MARK;
208 trace_class_resolution_impl(to_class, THREAD);
209 if (HAS_PENDING_EXCEPTION) {
210 CLEAR_PENDING_EXCEPTION;
211 }
212 }
213
214 // Wrapper to trace JVM functions
215
216 #ifdef ASSERT
217 Histogram* JVMHistogram;
218 volatile jint JVMHistogram_lock = 0;
219
220 class JVMHistogramElement : public HistogramElement {
221 public:
222 JVMHistogramElement(const char* name);
223 };
224
225 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
226 _name = elementName;
227 uintx count = 0;
228
229 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
230 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
231 count +=1;
232 if ( (WarnOnStalledSpinLock > 0)
233 && (count % WarnOnStalledSpinLock == 0)) {
234 warning("JVMHistogram_lock seems to be stalled");
235 }
236 }
237 }
238
239 if(JVMHistogram == NULL)
240 JVMHistogram = new Histogram("JVM Call Counts",100);
241
242 JVMHistogram->add_element(this);
243 Atomic::dec(&JVMHistogram_lock);
244 }
245
246 #define JVMCountWrapper(arg) \
247 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
248 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
249
250 #define JVMWrapper(arg) JVMCountWrapper(arg);
251 #else
252 #define JVMWrapper(arg)
253 #endif
254
255
256 // Interface version /////////////////////////////////////////////////////////////////////
257
258
259 JVM_LEAF(jint, JVM_GetInterfaceVersion())
260 return JVM_INTERFACE_VERSION;
261 JVM_END
262
263
264 // java.lang.System //////////////////////////////////////////////////////////////////////
265
266
267 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
268 JVMWrapper("JVM_CurrentTimeMillis");
269 return os::javaTimeMillis();
270 JVM_END
271
272 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
273 JVMWrapper("JVM_NanoTime");
274 return os::javaTimeNanos();
275 JVM_END
276
277 // The function below is actually exposed by jdk.internal.misc.VM and not
278 // java.lang.System, but we choose to keep it here so that it stays next
279 // to JVM_CurrentTimeMillis and JVM_NanoTime
280
281 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
282 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
283
284 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
285 JVMWrapper("JVM_GetNanoTimeAdjustment");
286 jlong seconds;
287 jlong nanos;
288
289 os::javaTimeSystemUTC(seconds, nanos);
290
291 // We're going to verify that the result can fit in a long.
292 // For that we need the difference in seconds between 'seconds'
293 // and 'offset_secs' to be such that:
294 // |seconds - offset_secs| < (2^63/10^9)
295 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
296 // which makes |seconds - offset_secs| < 2^33
297 // and we will prefer +/- 2^32 as the maximum acceptable diff
298 // as 2^32 has a more natural feel than 2^33...
299 //
300 // So if |seconds - offset_secs| >= 2^32 - we return a special
301 // sentinel value (-1) which the caller should take as an
302 // exception value indicating that the offset given to us is
303 // too far from range of the current time - leading to too big
304 // a nano adjustment. The caller is expected to recover by
305 // computing a more accurate offset and calling this method
306 // again. (For the record 2^32 secs is ~136 years, so that
307 // should rarely happen)
308 //
309 jlong diff = seconds - offset_secs;
310 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
311 return -1; // sentinel value: the offset is too far off the target
312 }
313
314 // return the adjustment. If you compute a time by adding
315 // this number of nanoseconds along with the number of seconds
316 // in the offset you should get the current UTC time.
317 return (diff * (jlong)1000000000) + nanos;
318 JVM_END
319
320 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
321 jobject dst, jint dst_pos, jint length))
322 JVMWrapper("JVM_ArrayCopy");
323 // Check if we have null pointers
324 if (src == NULL || dst == NULL) {
325 THROW(vmSymbols::java_lang_NullPointerException());
326 }
327 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
328 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
329 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop");
330 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop");
331 // Do copy
332 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
333 JVM_END
334
335
336 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
337 JavaValue r(T_OBJECT);
338 // public synchronized Object put(Object key, Object value);
339 HandleMark hm(THREAD);
340 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
341 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
342 JavaCalls::call_virtual(&r,
343 props,
344 SystemDictionary::Properties_klass(),
345 vmSymbols::put_name(),
346 vmSymbols::object_object_object_signature(),
347 key_str,
348 value_str,
349 THREAD);
350 }
351
352
353 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
354
355
356 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
357 JVMWrapper("JVM_InitProperties");
358 ResourceMark rm;
359
360 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
361
362 // System property list includes both user set via -D option and
363 // jvm system specific properties.
364 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
365 PUTPROP(props, p->key(), p->value());
366 }
367
368 // Convert the -XX:MaxDirectMemorySize= command line flag
369 // to the sun.nio.MaxDirectMemorySize property.
370 // Do this after setting user properties to prevent people
371 // from setting the value with a -D option, as requested.
372 {
373 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
374 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
375 } else {
376 char as_chars[256];
377 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
378 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
379 }
380 }
381
382 // JVM monitoring and management support
383 // Add the sun.management.compiler property for the compiler's name
384 {
385 #undef CSIZE
386 #if defined(_LP64) || defined(_WIN64)
387 #define CSIZE "64-Bit "
388 #else
389 #define CSIZE
390 #endif // 64bit
391
392 #ifdef TIERED
393 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
394 #else
395 #if defined(COMPILER1)
396 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
397 #elif defined(COMPILER2)
398 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
399 #elif INCLUDE_JVMCI
400 #error "INCLUDE_JVMCI should imply TIERED"
401 #else
402 const char* compiler_name = "";
403 #endif // compilers
404 #endif // TIERED
405
406 if (*compiler_name != '\0' &&
407 (Arguments::mode() != Arguments::_int)) {
408 PUTPROP(props, "sun.management.compiler", compiler_name);
409 }
410 }
411
412 return properties;
413 JVM_END
414
415
416 /*
417 * Return the temporary directory that the VM uses for the attach
418 * and perf data files.
419 *
420 * It is important that this directory is well-known and the
421 * same for all VM instances. It cannot be affected by configuration
422 * variables such as java.io.tmpdir.
423 */
424 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
425 JVMWrapper("JVM_GetTemporaryDirectory");
426 HandleMark hm(THREAD);
427 const char* temp_dir = os::get_temp_directory();
428 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
429 return (jstring) JNIHandles::make_local(env, h());
430 JVM_END
431
432
433 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
434
435 extern volatile jint vm_created;
436
437 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
438 before_exit(thread);
439 vm_exit(code);
440 JVM_END
441
442
443 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
444 JVMWrapper("JVM_GC");
445 if (!DisableExplicitGC) {
446 Universe::heap()->collect(GCCause::_java_lang_system_gc);
447 }
448 JVM_END
449
450
451 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
452 JVMWrapper("JVM_MaxObjectInspectionAge");
453 return Universe::heap()->millis_since_last_gc();
454 JVM_END
455
456
457 static inline jlong convert_size_t_to_jlong(size_t val) {
458 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
459 NOT_LP64 (return (jlong)val;)
460 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
461 }
462
463 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
464 JVMWrapper("JVM_TotalMemory");
465 size_t n = Universe::heap()->capacity();
466 return convert_size_t_to_jlong(n);
467 JVM_END
468
469
470 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
471 JVMWrapper("JVM_FreeMemory");
472 CollectedHeap* ch = Universe::heap();
473 size_t n;
474 {
475 MutexLocker x(Heap_lock);
476 n = ch->capacity() - ch->used();
477 }
478 return convert_size_t_to_jlong(n);
479 JVM_END
480
481
482 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
483 JVMWrapper("JVM_MaxMemory");
484 size_t n = Universe::heap()->max_capacity();
485 return convert_size_t_to_jlong(n);
486 JVM_END
487
488
489 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
490 JVMWrapper("JVM_ActiveProcessorCount");
491 return os::active_processor_count();
492 JVM_END
493
494
495
496 // java.lang.Throwable //////////////////////////////////////////////////////
497
498
499 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
500 JVMWrapper("JVM_FillInStackTrace");
501 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
502 java_lang_Throwable::fill_in_stack_trace(exception);
503 JVM_END
504
505
506 // java.lang.StackTraceElement //////////////////////////////////////////////
507
508
509 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
510 JVMWrapper("JVM_InitStackTraceElementArray");
511 Handle exception(THREAD, JNIHandles::resolve(throwable));
512 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
513 objArrayHandle stack_trace(THREAD, st);
514 // Fill in the allocated stack trace
515 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
516 JVM_END
517
518
519 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
520 JVMWrapper("JVM_InitStackTraceElement");
521 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
522 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
523 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
524 JVM_END
525
526
527 // java.lang.StackWalker //////////////////////////////////////////////////////
528
529
530 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
531 jint skip_frames, jint frame_count, jint start_index,
532 jobjectArray frames))
533 JVMWrapper("JVM_CallStackWalk");
534 JavaThread* jt = (JavaThread*) THREAD;
535 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
536 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
537 }
538
539 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
540
541 // frames array is a Class<?>[] array when only getting caller reference,
542 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
543 // be null.
544 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
545 objArrayHandle frames_array_h(THREAD, fa);
546
547 int limit = start_index + frame_count;
548 if (frames_array_h->length() < limit) {
549 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
550 }
551
552 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
553 start_index, frames_array_h, CHECK_NULL);
554 return JNIHandles::make_local(env, result);
555 JVM_END
556
557
558 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
559 jint frame_count, jint start_index,
560 jobjectArray frames))
561 JVMWrapper("JVM_MoreStackWalk");
562 JavaThread* jt = (JavaThread*) THREAD;
563
564 // frames array is a Class<?>[] array when only getting caller reference,
565 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
566 // be null.
567 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
568 objArrayHandle frames_array_h(THREAD, fa);
569
570 int limit = start_index+frame_count;
571 if (frames_array_h->length() < limit) {
572 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
573 }
574
575 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
576 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
577 start_index, frames_array_h, THREAD);
578 JVM_END
579
580 // java.lang.Object ///////////////////////////////////////////////
581
582
583 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
584 JVMWrapper("JVM_IHashCode");
585 // as implemented in the classic virtual machine; return 0 if object is NULL
586 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
587 JVM_END
588
589
590 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
591 JVMWrapper("JVM_MonitorWait");
592 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
593 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
594 if (JvmtiExport::should_post_monitor_wait()) {
595 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
596
597 // The current thread already owns the monitor and it has not yet
598 // been added to the wait queue so the current thread cannot be
599 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
600 // event handler cannot accidentally consume an unpark() meant for
601 // the ParkEvent associated with this ObjectMonitor.
602 }
603 ObjectSynchronizer::wait(obj, ms, CHECK);
604 JVM_END
605
606
607 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
608 JVMWrapper("JVM_MonitorNotify");
609 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
610 ObjectSynchronizer::notify(obj, CHECK);
611 JVM_END
612
613
614 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
615 JVMWrapper("JVM_MonitorNotifyAll");
616 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
617 ObjectSynchronizer::notifyall(obj, CHECK);
618 JVM_END
619
620
621 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
622 JVMWrapper("JVM_Clone");
623 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
624 Klass* klass = obj->klass();
625 JvmtiVMObjectAllocEventCollector oam;
626
627 #ifdef ASSERT
628 // Just checking that the cloneable flag is set correct
629 if (obj->is_array()) {
630 guarantee(klass->is_cloneable(), "all arrays are cloneable");
631 } else {
632 guarantee(obj->is_instance(), "should be instanceOop");
633 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
634 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
635 }
636 #endif
637
638 // Check if class of obj supports the Cloneable interface.
639 // All arrays are considered to be cloneable (See JLS 20.1.5)
640 if (!klass->is_cloneable()) {
641 ResourceMark rm(THREAD);
642 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
643 }
644
645 // Make shallow object copy
646 const int size = obj->size();
647 oop new_obj_oop = NULL;
648 if (obj->is_array()) {
649 const int length = ((arrayOop)obj())->length();
650 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
651 } else {
652 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
653 }
654
655 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
656 // is modifying a reference field in the clonee, a non-oop-atomic copy might
657 // be suspended in the middle of copying the pointer and end up with parts
658 // of two different pointers in the field. Subsequent dereferences will crash.
659 // 4846409: an oop-copy of objects with long or double fields or arrays of same
660 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
661 // of oops. We know objects are aligned on a minimum of an jlong boundary.
662 // The same is true of StubRoutines::object_copy and the various oop_copy
663 // variants, and of the code generated by the inline_native_clone intrinsic.
664 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
665 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop,
666 align_object_size(size) / HeapWordsPerLong);
667 // Clear the header
668 new_obj_oop->init_mark();
669
670 // Store check (mark entire object and let gc sort it out)
671 BarrierSet* bs = Universe::heap()->barrier_set();
672 assert(bs->has_write_region_opt(), "Barrier set does not have write_region");
673 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size));
674
675 Handle new_obj(THREAD, new_obj_oop);
676 // Caution: this involves a java upcall, so the clone should be
677 // "gc-robust" by this stage.
678 if (klass->has_finalizer()) {
679 assert(obj->is_instance(), "should be instanceOop");
680 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
681 new_obj = Handle(THREAD, new_obj_oop);
682 }
683
684 return JNIHandles::make_local(env, new_obj());
685 JVM_END
686
687 // java.io.File ///////////////////////////////////////////////////////////////
688
689 JVM_LEAF(char*, JVM_NativePath(char* path))
690 JVMWrapper("JVM_NativePath");
691 return os::native_path(path);
692 JVM_END
693
694
695 // Misc. class handling ///////////////////////////////////////////////////////////
696
697
698 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
699 JVMWrapper("JVM_GetCallerClass");
700
701 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
702 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
703 // temporarily for existing code to use until a replacement API is defined.
704 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
705 Klass* k = thread->security_get_caller_class(depth);
706 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
707 }
708
709 // Getting the class of the caller frame.
710 //
711 // The call stack at this point looks something like this:
712 //
713 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
714 // [1] [ @CallerSensitive API.method ]
715 // [.] [ (skipped intermediate frames) ]
716 // [n] [ caller ]
717 vframeStream vfst(thread);
718 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
719 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
720 Method* m = vfst.method();
721 assert(m != NULL, "sanity");
722 switch (n) {
723 case 0:
724 // This must only be called from Reflection.getCallerClass
725 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
726 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
727 }
728 // fall-through
729 case 1:
730 // Frame 0 and 1 must be caller sensitive.
731 if (!m->caller_sensitive()) {
732 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
733 }
734 break;
735 default:
736 if (!m->is_ignored_by_security_stack_walk()) {
737 // We have reached the desired frame; return the holder class.
738 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
739 }
740 break;
741 }
742 }
743 return NULL;
744 JVM_END
745
746
747 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
748 JVMWrapper("JVM_FindPrimitiveClass");
749 oop mirror = NULL;
750 BasicType t = name2type(utf);
751 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
752 mirror = Universe::java_mirror(t);
753 }
754 if (mirror == NULL) {
755 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
756 } else {
757 return (jclass) JNIHandles::make_local(env, mirror);
758 }
759 JVM_END
760
761
762 // Returns a class loaded by the bootstrap class loader; or null
763 // if not found. ClassNotFoundException is not thrown.
764 // FindClassFromBootLoader is exported to the launcher for windows.
765 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
766 const char* name))
767 JVMWrapper("JVM_FindClassFromBootLoader");
768
769 // Java libraries should ensure that name is never null...
770 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
771 // It's impossible to create this class; the name cannot fit
772 // into the constant pool.
773 return NULL;
774 }
775
776 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
777 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
778 if (k == NULL) {
779 return NULL;
780 }
781
782 if (log_is_enabled(Debug, class, resolve)) {
783 trace_class_resolution(k);
784 }
785 return (jclass) JNIHandles::make_local(env, k->java_mirror());
786 JVM_END
787
788 // Find a class with this name in this loader, using the caller's protection domain.
789 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
790 jboolean init, jobject loader,
791 jclass caller))
792 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
793 // Java libraries should ensure that name is never null...
794 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
795 // It's impossible to create this class; the name cannot fit
796 // into the constant pool.
797 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
798 }
799
800 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
801
802 oop loader_oop = JNIHandles::resolve(loader);
803 oop from_class = JNIHandles::resolve(caller);
804 oop protection_domain = NULL;
805 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
806 // NPE. Put it in another way, the bootstrap class loader has all permission and
807 // thus no checkPackageAccess equivalence in the VM class loader.
808 // The caller is also passed as NULL by the java code if there is no security
809 // manager to avoid the performance cost of getting the calling class.
810 if (from_class != NULL && loader_oop != NULL) {
811 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
812 }
813
814 Handle h_loader(THREAD, loader_oop);
815 Handle h_prot(THREAD, protection_domain);
816 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
817 h_prot, false, THREAD);
818
819 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
820 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
821 }
822 return result;
823 JVM_END
824
825 // Currently only called from the old verifier.
826 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
827 jboolean init, jclass from))
828 JVMWrapper("JVM_FindClassFromClass");
829 if (name == NULL) {
830 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
831 }
832 if ((int)strlen(name) > Symbol::max_length()) {
833 // It's impossible to create this class; the name cannot fit
834 // into the constant pool.
835 Exceptions::fthrow(THREAD_AND_LOCATION,
836 vmSymbols::java_lang_NoClassDefFoundError(),
837 "Class name exceeds maximum length of %d: %s",
838 Symbol::max_length(),
839 name);
840 return 0;
841 }
842 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
843 oop from_class_oop = JNIHandles::resolve(from);
844 Klass* from_class = (from_class_oop == NULL)
845 ? (Klass*)NULL
846 : java_lang_Class::as_Klass(from_class_oop);
847 oop class_loader = NULL;
848 oop protection_domain = NULL;
849 if (from_class != NULL) {
850 class_loader = from_class->class_loader();
851 protection_domain = from_class->protection_domain();
852 }
853 Handle h_loader(THREAD, class_loader);
854 Handle h_prot (THREAD, protection_domain);
855 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
856 h_prot, true, thread);
857
858 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
859 // this function is generally only used for class loading during verification.
860 ResourceMark rm;
861 oop from_mirror = JNIHandles::resolve_non_null(from);
862 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
863 const char * from_name = from_class->external_name();
864
865 oop mirror = JNIHandles::resolve_non_null(result);
866 Klass* to_class = java_lang_Class::as_Klass(mirror);
867 const char * to = to_class->external_name();
868 log_debug(class, resolve)("%s %s (verification)", from_name, to);
869 }
870
871 return result;
872 JVM_END
873
874 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
875 if (loader.is_null()) {
876 return;
877 }
878
879 // check whether the current caller thread holds the lock or not.
880 // If not, increment the corresponding counter
881 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
882 ObjectSynchronizer::owner_self) {
883 counter->inc();
884 }
885 }
886
887 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
888 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
889 jobject loader, const jbyte *buf,
890 jsize len, jobject pd, const char *source,
891 TRAPS) {
892 if (source == NULL) source = "__JVM_DefineClass__";
893
894 assert(THREAD->is_Java_thread(), "must be a JavaThread");
895 JavaThread* jt = (JavaThread*) THREAD;
896
897 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
898 ClassLoader::perf_define_appclass_selftime(),
899 ClassLoader::perf_define_appclasses(),
900 jt->get_thread_stat()->perf_recursion_counts_addr(),
901 jt->get_thread_stat()->perf_timers_addr(),
902 PerfClassTraceTime::DEFINE_CLASS);
903
904 if (UsePerfData) {
905 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
906 }
907
908 // Since exceptions can be thrown, class initialization can take place
909 // if name is NULL no check for class name in .class stream has to be made.
910 TempNewSymbol class_name = NULL;
911 if (name != NULL) {
912 const int str_len = (int)strlen(name);
913 if (str_len > Symbol::max_length()) {
914 // It's impossible to create this class; the name cannot fit
915 // into the constant pool.
916 Exceptions::fthrow(THREAD_AND_LOCATION,
917 vmSymbols::java_lang_NoClassDefFoundError(),
918 "Class name exceeds maximum length of %d: %s",
919 Symbol::max_length(),
920 name);
921 return 0;
922 }
923 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
924 }
925
926 ResourceMark rm(THREAD);
927 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
928 Handle class_loader (THREAD, JNIHandles::resolve(loader));
929 if (UsePerfData) {
930 is_lock_held_by_thread(class_loader,
931 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
932 THREAD);
933 }
934 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
935 Klass* k = SystemDictionary::resolve_from_stream(class_name,
936 class_loader,
937 protection_domain,
938 &st,
939 CHECK_NULL);
940
941 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
942 trace_class_resolution(k);
943 }
944
945 return (jclass) JNIHandles::make_local(env, k->java_mirror());
946 }
947
948
949 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
950 JVMWrapper("JVM_DefineClass");
951
952 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
953 JVM_END
954
955
956 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
957 JVMWrapper("JVM_DefineClassWithSource");
958
959 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
960 JVM_END
961
962 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
963 JVMWrapper("JVM_FindLoadedClass");
964 ResourceMark rm(THREAD);
965
966 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
967 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
968
969 const char* str = java_lang_String::as_utf8_string(string());
970 // Sanity check, don't expect null
971 if (str == NULL) return NULL;
972
973 const int str_len = (int)strlen(str);
974 if (str_len > Symbol::max_length()) {
975 // It's impossible to create this class; the name cannot fit
976 // into the constant pool.
977 return NULL;
978 }
979 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
980
981 // Security Note:
982 // The Java level wrapper will perform the necessary security check allowing
983 // us to pass the NULL as the initiating class loader.
984 Handle h_loader(THREAD, JNIHandles::resolve(loader));
985 if (UsePerfData) {
986 is_lock_held_by_thread(h_loader,
987 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
988 THREAD);
989 }
990
991 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
992 h_loader,
993 Handle(),
994 CHECK_NULL);
995 #if INCLUDE_CDS
996 if (k == NULL) {
997 // If the class is not already loaded, try to see if it's in the shared
998 // archive for the current classloader (h_loader).
999 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1000 }
1001 #endif
1002 return (k == NULL) ? NULL :
1003 (jclass) JNIHandles::make_local(env, k->java_mirror());
1004 JVM_END
1005
1006 // Module support //////////////////////////////////////////////////////////////////////////////
1007
1008 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1009 jstring location, const char* const* packages, jsize num_packages))
1010 JVMWrapper("JVM_DefineModule");
1011 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1012 JVM_END
1013
1014 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1015 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1016 Modules::set_bootloader_unnamed_module(module, CHECK);
1017 JVM_END
1018
1019 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1020 JVMWrapper("JVM_AddModuleExports");
1021 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1022 JVM_END
1023
1024 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1025 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1026 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1027 JVM_END
1028
1029 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1030 JVMWrapper("JVM_AddModuleExportsToAll");
1031 Modules::add_module_exports(from_module, package, NULL, CHECK);
1032 JVM_END
1033
1034 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1035 JVMWrapper("JVM_AddReadsModule");
1036 Modules::add_reads_module(from_module, source_module, CHECK);
1037 JVM_END
1038
1039 // Reflection support //////////////////////////////////////////////////////////////////////////////
1040
1041 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1042 assert (cls != NULL, "illegal class");
1043 JVMWrapper("JVM_GetClassName");
1044 JvmtiVMObjectAllocEventCollector oam;
1045 ResourceMark rm(THREAD);
1046 const char* name;
1047 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1048 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1049 } else {
1050 // Consider caching interned string in Klass
1051 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1052 assert(k->is_klass(), "just checking");
1053 name = k->external_name();
1054 }
1055 oop result = StringTable::intern((char*) name, CHECK_NULL);
1056 return (jstring) JNIHandles::make_local(env, result);
1057 JVM_END
1058
1059
1060 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1061 JVMWrapper("JVM_GetClassInterfaces");
1062 JvmtiVMObjectAllocEventCollector oam;
1063 oop mirror = JNIHandles::resolve_non_null(cls);
1064
1065 // Special handling for primitive objects
1066 if (java_lang_Class::is_primitive(mirror)) {
1067 // Primitive objects does not have any interfaces
1068 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1069 return (jobjectArray) JNIHandles::make_local(env, r);
1070 }
1071
1072 Klass* klass = java_lang_Class::as_Klass(mirror);
1073 // Figure size of result array
1074 int size;
1075 if (klass->is_instance_klass()) {
1076 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1077 } else {
1078 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1079 size = 2;
1080 }
1081
1082 // Allocate result array
1083 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1084 objArrayHandle result (THREAD, r);
1085 // Fill in result
1086 if (klass->is_instance_klass()) {
1087 // Regular instance klass, fill in all local interfaces
1088 for (int index = 0; index < size; index++) {
1089 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1090 result->obj_at_put(index, k->java_mirror());
1091 }
1092 } else {
1093 // All arrays implement java.lang.Cloneable and java.io.Serializable
1094 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1095 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1096 }
1097 return (jobjectArray) JNIHandles::make_local(env, result());
1098 JVM_END
1099
1100
1101 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1102 JVMWrapper("JVM_IsInterface");
1103 oop mirror = JNIHandles::resolve_non_null(cls);
1104 if (java_lang_Class::is_primitive(mirror)) {
1105 return JNI_FALSE;
1106 }
1107 Klass* k = java_lang_Class::as_Klass(mirror);
1108 jboolean result = k->is_interface();
1109 assert(!result || k->is_instance_klass(),
1110 "all interfaces are instance types");
1111 // The compiler intrinsic for isInterface tests the
1112 // Klass::_access_flags bits in the same way.
1113 return result;
1114 JVM_END
1115
1116
1117 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1118 JVMWrapper("JVM_GetClassSigners");
1119 JvmtiVMObjectAllocEventCollector oam;
1120 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1121 // There are no signers for primitive types
1122 return NULL;
1123 }
1124
1125 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1126
1127 // If there are no signers set in the class, or if the class
1128 // is an array, return NULL.
1129 if (signers == NULL) return NULL;
1130
1131 // copy of the signers array
1132 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1133 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1134 for (int index = 0; index < signers->length(); index++) {
1135 signers_copy->obj_at_put(index, signers->obj_at(index));
1136 }
1137
1138 // return the copy
1139 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1140 JVM_END
1141
1142
1143 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1144 JVMWrapper("JVM_SetClassSigners");
1145 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1146 // This call is ignored for primitive types and arrays.
1147 // Signers are only set once, ClassLoader.java, and thus shouldn't
1148 // be called with an array. Only the bootstrap loader creates arrays.
1149 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1150 if (k->is_instance_klass()) {
1151 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1152 }
1153 }
1154 JVM_END
1155
1156
1157 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1158 JVMWrapper("JVM_GetProtectionDomain");
1159 if (JNIHandles::resolve(cls) == NULL) {
1160 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1161 }
1162
1163 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1164 // Primitive types does not have a protection domain.
1165 return NULL;
1166 }
1167
1168 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1169 return (jobject) JNIHandles::make_local(env, pd);
1170 JVM_END
1171
1172
1173 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) {
1174 // If there is a security manager and protection domain, check the access
1175 // in the protection domain, otherwise it is authorized.
1176 if (java_lang_System::has_security_manager()) {
1177
1178 // For bootstrapping, if pd implies method isn't in the JDK, allow
1179 // this context to revert to older behavior.
1180 // In this case the isAuthorized field in AccessControlContext is also not
1181 // present.
1182 if (Universe::protection_domain_implies_method() == NULL) {
1183 return true;
1184 }
1185
1186 // Whitelist certain access control contexts
1187 if (java_security_AccessControlContext::is_authorized(context)) {
1188 return true;
1189 }
1190
1191 oop prot = klass->protection_domain();
1192 if (prot != NULL) {
1193 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1194 // in the new wrapper.
1195 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1196 Handle h_prot(THREAD, prot);
1197 JavaValue result(T_BOOLEAN);
1198 JavaCallArguments args(h_prot);
1199 JavaCalls::call(&result, m, &args, CHECK_false);
1200 return (result.get_jboolean() != 0);
1201 }
1202 }
1203 return true;
1204 }
1205
1206 // Create an AccessControlContext with a protection domain with null codesource
1207 // and null permissions - which gives no permissions.
1208 oop create_dummy_access_control_context(TRAPS) {
1209 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1210 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1211 // Call constructor ProtectionDomain(null, null);
1212 JavaValue result(T_VOID);
1213 JavaCalls::call_special(&result, obj, pd_klass,
1214 vmSymbols::object_initializer_name(),
1215 vmSymbols::codesource_permissioncollection_signature(),
1216 Handle(), Handle(), CHECK_NULL);
1217
1218 // new ProtectionDomain[] {pd};
1219 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1220 context->obj_at_put(0, obj());
1221
1222 // new AccessControlContext(new ProtectionDomain[] {pd})
1223 objArrayHandle h_context(THREAD, context);
1224 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1225 return acc;
1226 }
1227
1228 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1229 JVMWrapper("JVM_DoPrivileged");
1230
1231 if (action == NULL) {
1232 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1233 }
1234
1235 // Compute the frame initiating the do privileged operation and setup the privileged stack
1236 vframeStream vfst(thread);
1237 vfst.security_get_caller_frame(1);
1238
1239 if (vfst.at_end()) {
1240 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1241 }
1242
1243 Method* method = vfst.method();
1244 InstanceKlass* klass = method->method_holder();
1245
1246 // Check that action object understands "Object run()"
1247 Handle h_context;
1248 if (context != NULL) {
1249 h_context = Handle(THREAD, JNIHandles::resolve(context));
1250 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1251 if (!authorized) {
1252 // Create an unprivileged access control object and call it's run function
1253 // instead.
1254 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1255 h_context = Handle(THREAD, noprivs);
1256 }
1257 }
1258
1259 // Check that action object understands "Object run()"
1260 Handle object (THREAD, JNIHandles::resolve(action));
1261
1262 // get run() method
1263 Method* m_oop = object->klass()->uncached_lookup_method(
1264 vmSymbols::run_method_name(),
1265 vmSymbols::void_object_signature(),
1266 Klass::find_overpass);
1267
1268 // See if there is a default method for "Object run()".
1269 if (m_oop == NULL && object->klass()->is_instance_klass()) {
1270 InstanceKlass* iklass = InstanceKlass::cast(object->klass());
1271 m_oop = iklass->lookup_method_in_ordered_interfaces(
1272 vmSymbols::run_method_name(),
1273 vmSymbols::void_object_signature());
1274 }
1275
1276 methodHandle m (THREAD, m_oop);
1277 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) {
1278 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1279 }
1280
1281 // Stack allocated list of privileged stack elements
1282 PrivilegedElement pi;
1283 if (!vfst.at_end()) {
1284 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1285 thread->set_privileged_stack_top(&pi);
1286 }
1287
1288
1289 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1290 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1291 Handle pending_exception;
1292 JavaValue result(T_OBJECT);
1293 JavaCallArguments args(object);
1294 JavaCalls::call(&result, m, &args, THREAD);
1295
1296 // done with action, remove ourselves from the list
1297 if (!vfst.at_end()) {
1298 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1299 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1300 }
1301
1302 if (HAS_PENDING_EXCEPTION) {
1303 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1304 CLEAR_PENDING_EXCEPTION;
1305 // JVMTI has already reported the pending exception
1306 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1307 if (THREAD->is_Java_thread()) {
1308 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1309 }
1310 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1311 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1312 // Throw a java.security.PrivilegedActionException(Exception e) exception
1313 JavaCallArguments args(pending_exception);
1314 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1315 vmSymbols::exception_void_signature(),
1316 &args);
1317 }
1318 }
1319
1320 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1321 return JNIHandles::make_local(env, (oop) result.get_jobject());
1322 JVM_END
1323
1324
1325 // Returns the inherited_access_control_context field of the running thread.
1326 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1327 JVMWrapper("JVM_GetInheritedAccessControlContext");
1328 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1329 return JNIHandles::make_local(env, result);
1330 JVM_END
1331
1332 class RegisterArrayForGC {
1333 private:
1334 JavaThread *_thread;
1335 public:
1336 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1337 _thread = thread;
1338 _thread->register_array_for_gc(array);
1339 }
1340
1341 ~RegisterArrayForGC() {
1342 _thread->register_array_for_gc(NULL);
1343 }
1344 };
1345
1346
1347 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1348 JVMWrapper("JVM_GetStackAccessControlContext");
1349 if (!UsePrivilegedStack) return NULL;
1350
1351 ResourceMark rm(THREAD);
1352 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1353 JvmtiVMObjectAllocEventCollector oam;
1354
1355 // count the protection domains on the execution stack. We collapse
1356 // duplicate consecutive protection domains into a single one, as
1357 // well as stopping when we hit a privileged frame.
1358
1359 // Use vframeStream to iterate through Java frames
1360 vframeStream vfst(thread);
1361
1362 oop previous_protection_domain = NULL;
1363 Handle privileged_context(thread, NULL);
1364 bool is_privileged = false;
1365 oop protection_domain = NULL;
1366
1367 for(; !vfst.at_end(); vfst.next()) {
1368 // get method of frame
1369 Method* method = vfst.method();
1370 intptr_t* frame_id = vfst.frame_id();
1371
1372 // check the privileged frames to see if we have a match
1373 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1374 // this frame is privileged
1375 is_privileged = true;
1376 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1377 protection_domain = thread->privileged_stack_top()->protection_domain();
1378 } else {
1379 protection_domain = method->method_holder()->protection_domain();
1380 }
1381
1382 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1383 local_array->push(protection_domain);
1384 previous_protection_domain = protection_domain;
1385 }
1386
1387 if (is_privileged) break;
1388 }
1389
1390
1391 // either all the domains on the stack were system domains, or
1392 // we had a privileged system domain
1393 if (local_array->is_empty()) {
1394 if (is_privileged && privileged_context.is_null()) return NULL;
1395
1396 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1397 return JNIHandles::make_local(env, result);
1398 }
1399
1400 // the resource area must be registered in case of a gc
1401 RegisterArrayForGC ragc(thread, local_array);
1402 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1403 local_array->length(), CHECK_NULL);
1404 objArrayHandle h_context(thread, context);
1405 for (int index = 0; index < local_array->length(); index++) {
1406 h_context->obj_at_put(index, local_array->at(index));
1407 }
1408
1409 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1410
1411 return JNIHandles::make_local(env, result);
1412 JVM_END
1413
1414
1415 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1416 JVMWrapper("JVM_IsArrayClass");
1417 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1418 return (k != NULL) && k->is_array_klass() ? true : false;
1419 JVM_END
1420
1421
1422 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1423 JVMWrapper("JVM_IsPrimitiveClass");
1424 oop mirror = JNIHandles::resolve_non_null(cls);
1425 return (jboolean) java_lang_Class::is_primitive(mirror);
1426 JVM_END
1427
1428
1429 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1430 JVMWrapper("JVM_GetClassModifiers");
1431 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1432 // Primitive type
1433 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1434 }
1435
1436 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1437 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1438 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1439 return k->modifier_flags();
1440 JVM_END
1441
1442
1443 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1444
1445 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1446 JvmtiVMObjectAllocEventCollector oam;
1447 // ofClass is a reference to a java_lang_Class object. The mirror object
1448 // of an InstanceKlass
1449
1450 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1451 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1452 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1453 return (jobjectArray)JNIHandles::make_local(env, result);
1454 }
1455
1456 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1457 InnerClassesIterator iter(k);
1458
1459 if (iter.length() == 0) {
1460 // Neither an inner nor outer class
1461 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1462 return (jobjectArray)JNIHandles::make_local(env, result);
1463 }
1464
1465 // find inner class info
1466 constantPoolHandle cp(thread, k->constants());
1467 int length = iter.length();
1468
1469 // Allocate temp. result array
1470 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1471 objArrayHandle result (THREAD, r);
1472 int members = 0;
1473
1474 for (; !iter.done(); iter.next()) {
1475 int ioff = iter.inner_class_info_index();
1476 int ooff = iter.outer_class_info_index();
1477
1478 if (ioff != 0 && ooff != 0) {
1479 // Check to see if the name matches the class we're looking for
1480 // before attempting to find the class.
1481 if (cp->klass_name_at_matches(k, ooff)) {
1482 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1483 if (outer_klass == k) {
1484 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1485 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1486
1487 // Throws an exception if outer klass has not declared k as
1488 // an inner klass
1489 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1490
1491 result->obj_at_put(members, inner_klass->java_mirror());
1492 members++;
1493 }
1494 }
1495 }
1496 }
1497
1498 if (members != length) {
1499 // Return array of right length
1500 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1501 for(int i = 0; i < members; i++) {
1502 res->obj_at_put(i, result->obj_at(i));
1503 }
1504 return (jobjectArray)JNIHandles::make_local(env, res);
1505 }
1506
1507 return (jobjectArray)JNIHandles::make_local(env, result());
1508 JVM_END
1509
1510
1511 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1512 {
1513 // ofClass is a reference to a java_lang_Class object.
1514 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1515 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1516 return NULL;
1517 }
1518
1519 bool inner_is_member = false;
1520 Klass* outer_klass
1521 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1522 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1523 if (outer_klass == NULL) return NULL; // already a top-level class
1524 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1525 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1526 }
1527 JVM_END
1528
1529 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1530 {
1531 oop mirror = JNIHandles::resolve_non_null(cls);
1532 if (java_lang_Class::is_primitive(mirror) ||
1533 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1534 return NULL;
1535 }
1536 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1537 int ooff = 0, noff = 0;
1538 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1539 if (noff != 0) {
1540 constantPoolHandle i_cp(thread, k->constants());
1541 Symbol* name = i_cp->symbol_at(noff);
1542 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1543 return (jstring) JNIHandles::make_local(env, str());
1544 }
1545 }
1546 return NULL;
1547 }
1548 JVM_END
1549
1550 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1551 assert (cls != NULL, "illegal class");
1552 JVMWrapper("JVM_GetClassSignature");
1553 JvmtiVMObjectAllocEventCollector oam;
1554 ResourceMark rm(THREAD);
1555 // Return null for arrays and primatives
1556 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1557 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1558 if (k->is_instance_klass()) {
1559 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1560 if (sym == NULL) return NULL;
1561 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1562 return (jstring) JNIHandles::make_local(env, str());
1563 }
1564 }
1565 return NULL;
1566 JVM_END
1567
1568
1569 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1570 assert (cls != NULL, "illegal class");
1571 JVMWrapper("JVM_GetClassAnnotations");
1572
1573 // Return null for arrays and primitives
1574 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1575 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1576 if (k->is_instance_klass()) {
1577 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1578 return (jbyteArray) JNIHandles::make_local(env, a);
1579 }
1580 }
1581 return NULL;
1582 JVM_END
1583
1584
1585 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1586 // some of this code was adapted from from jni_FromReflectedField
1587
1588 oop reflected = JNIHandles::resolve_non_null(field);
1589 oop mirror = java_lang_reflect_Field::clazz(reflected);
1590 Klass* k = java_lang_Class::as_Klass(mirror);
1591 int slot = java_lang_reflect_Field::slot(reflected);
1592 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1593
1594 InstanceKlass* ik = InstanceKlass::cast(k);
1595 intptr_t offset = ik->field_offset(slot);
1596
1597 if (modifiers & JVM_ACC_STATIC) {
1598 // for static fields we only look in the current class
1599 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1600 assert(false, "cannot find static field");
1601 return false;
1602 }
1603 } else {
1604 // for instance fields we start with the current class and work
1605 // our way up through the superclass chain
1606 if (!ik->find_field_from_offset(offset, false, &fd)) {
1607 assert(false, "cannot find instance field");
1608 return false;
1609 }
1610 }
1611 return true;
1612 }
1613
1614 static Method* jvm_get_method_common(jobject method) {
1615 // some of this code was adapted from from jni_FromReflectedMethod
1616
1617 oop reflected = JNIHandles::resolve_non_null(method);
1618 oop mirror = NULL;
1619 int slot = 0;
1620
1621 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1622 mirror = java_lang_reflect_Constructor::clazz(reflected);
1623 slot = java_lang_reflect_Constructor::slot(reflected);
1624 } else {
1625 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1626 "wrong type");
1627 mirror = java_lang_reflect_Method::clazz(reflected);
1628 slot = java_lang_reflect_Method::slot(reflected);
1629 }
1630 Klass* k = java_lang_Class::as_Klass(mirror);
1631
1632 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1633 assert(m != NULL, "cannot find method");
1634 return m; // caller has to deal with NULL in product mode
1635 }
1636
1637 /* Type use annotations support (JDK 1.8) */
1638
1639 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1640 assert (cls != NULL, "illegal class");
1641 JVMWrapper("JVM_GetClassTypeAnnotations");
1642 ResourceMark rm(THREAD);
1643 // Return null for arrays and primitives
1644 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1645 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1646 if (k->is_instance_klass()) {
1647 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1648 if (type_annotations != NULL) {
1649 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1650 return (jbyteArray) JNIHandles::make_local(env, a);
1651 }
1652 }
1653 }
1654 return NULL;
1655 JVM_END
1656
1657 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1658 assert (method != NULL, "illegal method");
1659 JVMWrapper("JVM_GetMethodTypeAnnotations");
1660
1661 // method is a handle to a java.lang.reflect.Method object
1662 Method* m = jvm_get_method_common(method);
1663 if (m == NULL) {
1664 return NULL;
1665 }
1666
1667 AnnotationArray* type_annotations = m->type_annotations();
1668 if (type_annotations != NULL) {
1669 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1670 return (jbyteArray) JNIHandles::make_local(env, a);
1671 }
1672
1673 return NULL;
1674 JVM_END
1675
1676 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1677 assert (field != NULL, "illegal field");
1678 JVMWrapper("JVM_GetFieldTypeAnnotations");
1679
1680 fieldDescriptor fd;
1681 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1682 if (!gotFd) {
1683 return NULL;
1684 }
1685
1686 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1687 JVM_END
1688
1689 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1690 if (!cp->is_within_bounds(index)) {
1691 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1692 }
1693 }
1694
1695 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1696 {
1697 JVMWrapper("JVM_GetMethodParameters");
1698 // method is a handle to a java.lang.reflect.Method object
1699 Method* method_ptr = jvm_get_method_common(method);
1700 methodHandle mh (THREAD, method_ptr);
1701 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1702 const int num_params = mh->method_parameters_length();
1703
1704 if (num_params < 0) {
1705 // A -1 return value from method_parameters_length means there is no
1706 // parameter data. Return null to indicate this to the reflection
1707 // API.
1708 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1709 return (jobjectArray)NULL;
1710 } else {
1711 // Otherwise, we return something up to reflection, even if it is
1712 // a zero-length array. Why? Because in some cases this can
1713 // trigger a MalformedParametersException.
1714
1715 // make sure all the symbols are properly formatted
1716 for (int i = 0; i < num_params; i++) {
1717 MethodParametersElement* params = mh->method_parameters_start();
1718 int index = params[i].name_cp_index;
1719 bounds_check(mh->constants(), index, CHECK_NULL);
1720
1721 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1722 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1723 "Wrong type at constant pool index");
1724 }
1725
1726 }
1727
1728 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1729 objArrayHandle result (THREAD, result_oop);
1730
1731 for (int i = 0; i < num_params; i++) {
1732 MethodParametersElement* params = mh->method_parameters_start();
1733 // For a 0 index, give a NULL symbol
1734 Symbol* sym = 0 != params[i].name_cp_index ?
1735 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1736 int flags = params[i].flags;
1737 oop param = Reflection::new_parameter(reflected_method, i, sym,
1738 flags, CHECK_NULL);
1739 result->obj_at_put(i, param);
1740 }
1741 return (jobjectArray)JNIHandles::make_local(env, result());
1742 }
1743 }
1744 JVM_END
1745
1746 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1747
1748 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1749 {
1750 JVMWrapper("JVM_GetClassDeclaredFields");
1751 JvmtiVMObjectAllocEventCollector oam;
1752
1753 // Exclude primitive types and array types
1754 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1755 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1756 // Return empty array
1757 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1758 return (jobjectArray) JNIHandles::make_local(env, res);
1759 }
1760
1761 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1762 constantPoolHandle cp(THREAD, k->constants());
1763
1764 // Ensure class is linked
1765 k->link_class(CHECK_NULL);
1766
1767 // Allocate result
1768 int num_fields;
1769
1770 if (publicOnly) {
1771 num_fields = 0;
1772 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1773 if (fs.access_flags().is_public()) ++num_fields;
1774 }
1775 } else {
1776 num_fields = k->java_fields_count();
1777 }
1778
1779 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1780 objArrayHandle result (THREAD, r);
1781
1782 int out_idx = 0;
1783 fieldDescriptor fd;
1784 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1785 if (!publicOnly || fs.access_flags().is_public()) {
1786 fd.reinitialize(k, fs.index());
1787 oop field = Reflection::new_field(&fd, CHECK_NULL);
1788 result->obj_at_put(out_idx, field);
1789 ++out_idx;
1790 }
1791 }
1792 assert(out_idx == num_fields, "just checking");
1793 return (jobjectArray) JNIHandles::make_local(env, result());
1794 }
1795 JVM_END
1796
1797 static bool select_method(const methodHandle& method, bool want_constructor) {
1798 if (want_constructor) {
1799 return (method->is_initializer() && !method->is_static());
1800 } else {
1801 return (!method->is_initializer() && !method->is_overpass());
1802 }
1803 }
1804
1805 static jobjectArray get_class_declared_methods_helper(
1806 JNIEnv *env,
1807 jclass ofClass, jboolean publicOnly,
1808 bool want_constructor,
1809 Klass* klass, TRAPS) {
1810
1811 JvmtiVMObjectAllocEventCollector oam;
1812
1813 // Exclude primitive types and array types
1814 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1815 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1816 // Return empty array
1817 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1818 return (jobjectArray) JNIHandles::make_local(env, res);
1819 }
1820
1821 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1822
1823 // Ensure class is linked
1824 k->link_class(CHECK_NULL);
1825
1826 Array<Method*>* methods = k->methods();
1827 int methods_length = methods->length();
1828
1829 // Save original method_idnum in case of redefinition, which can change
1830 // the idnum of obsolete methods. The new method will have the same idnum
1831 // but if we refresh the methods array, the counts will be wrong.
1832 ResourceMark rm(THREAD);
1833 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1834 int num_methods = 0;
1835
1836 for (int i = 0; i < methods_length; i++) {
1837 methodHandle method(THREAD, methods->at(i));
1838 if (select_method(method, want_constructor)) {
1839 if (!publicOnly || method->is_public()) {
1840 idnums->push(method->method_idnum());
1841 ++num_methods;
1842 }
1843 }
1844 }
1845
1846 // Allocate result
1847 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1848 objArrayHandle result (THREAD, r);
1849
1850 // Now just put the methods that we selected above, but go by their idnum
1851 // in case of redefinition. The methods can be redefined at any safepoint,
1852 // so above when allocating the oop array and below when creating reflect
1853 // objects.
1854 for (int i = 0; i < num_methods; i++) {
1855 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1856 if (method.is_null()) {
1857 // Method may have been deleted and seems this API can handle null
1858 // Otherwise should probably put a method that throws NSME
1859 result->obj_at_put(i, NULL);
1860 } else {
1861 oop m;
1862 if (want_constructor) {
1863 m = Reflection::new_constructor(method, CHECK_NULL);
1864 } else {
1865 m = Reflection::new_method(method, false, CHECK_NULL);
1866 }
1867 result->obj_at_put(i, m);
1868 }
1869 }
1870
1871 return (jobjectArray) JNIHandles::make_local(env, result());
1872 }
1873
1874 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1875 {
1876 JVMWrapper("JVM_GetClassDeclaredMethods");
1877 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1878 /*want_constructor*/ false,
1879 SystemDictionary::reflect_Method_klass(), THREAD);
1880 }
1881 JVM_END
1882
1883 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1884 {
1885 JVMWrapper("JVM_GetClassDeclaredConstructors");
1886 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1887 /*want_constructor*/ true,
1888 SystemDictionary::reflect_Constructor_klass(), THREAD);
1889 }
1890 JVM_END
1891
1892 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1893 {
1894 JVMWrapper("JVM_GetClassAccessFlags");
1895 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1896 // Primitive type
1897 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1898 }
1899
1900 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1901 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1902 }
1903 JVM_END
1904
1905
1906 // Constant pool access //////////////////////////////////////////////////////////
1907
1908 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1909 {
1910 JVMWrapper("JVM_GetClassConstantPool");
1911 JvmtiVMObjectAllocEventCollector oam;
1912
1913 // Return null for primitives and arrays
1914 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1915 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1916 if (k->is_instance_klass()) {
1917 InstanceKlass* k_h = InstanceKlass::cast(k);
1918 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1919 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1920 return JNIHandles::make_local(jcp());
1921 }
1922 }
1923 return NULL;
1924 }
1925 JVM_END
1926
1927
1928 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1929 {
1930 JVMWrapper("JVM_ConstantPoolGetSize");
1931 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1932 return cp->length();
1933 }
1934 JVM_END
1935
1936
1937 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1938 {
1939 JVMWrapper("JVM_ConstantPoolGetClassAt");
1940 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1941 bounds_check(cp, index, CHECK_NULL);
1942 constantTag tag = cp->tag_at(index);
1943 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1944 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1945 }
1946 Klass* k = cp->klass_at(index, CHECK_NULL);
1947 return (jclass) JNIHandles::make_local(k->java_mirror());
1948 }
1949 JVM_END
1950
1951 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1952 {
1953 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1954 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1955 bounds_check(cp, index, CHECK_NULL);
1956 constantTag tag = cp->tag_at(index);
1957 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1958 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1959 }
1960 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1961 if (k == NULL) return NULL;
1962 return (jclass) JNIHandles::make_local(k->java_mirror());
1963 }
1964 JVM_END
1965
1966 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1967 constantTag tag = cp->tag_at(index);
1968 if (!tag.is_method() && !tag.is_interface_method()) {
1969 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1970 }
1971 int klass_ref = cp->uncached_klass_ref_index_at(index);
1972 Klass* k_o;
1973 if (force_resolution) {
1974 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1975 } else {
1976 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1977 if (k_o == NULL) return NULL;
1978 }
1979 InstanceKlass* k = InstanceKlass::cast(k_o);
1980 Symbol* name = cp->uncached_name_ref_at(index);
1981 Symbol* sig = cp->uncached_signature_ref_at(index);
1982 methodHandle m (THREAD, k->find_method(name, sig));
1983 if (m.is_null()) {
1984 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1985 }
1986 oop method;
1987 if (!m->is_initializer() || m->is_static()) {
1988 method = Reflection::new_method(m, true, CHECK_NULL);
1989 } else {
1990 method = Reflection::new_constructor(m, CHECK_NULL);
1991 }
1992 return JNIHandles::make_local(method);
1993 }
1994
1995 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1996 {
1997 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1998 JvmtiVMObjectAllocEventCollector oam;
1999 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2000 bounds_check(cp, index, CHECK_NULL);
2001 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2002 return res;
2003 }
2004 JVM_END
2005
2006 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2007 {
2008 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2009 JvmtiVMObjectAllocEventCollector oam;
2010 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2011 bounds_check(cp, index, CHECK_NULL);
2012 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2013 return res;
2014 }
2015 JVM_END
2016
2017 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2018 constantTag tag = cp->tag_at(index);
2019 if (!tag.is_field()) {
2020 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2021 }
2022 int klass_ref = cp->uncached_klass_ref_index_at(index);
2023 Klass* k_o;
2024 if (force_resolution) {
2025 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2026 } else {
2027 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2028 if (k_o == NULL) return NULL;
2029 }
2030 InstanceKlass* k = InstanceKlass::cast(k_o);
2031 Symbol* name = cp->uncached_name_ref_at(index);
2032 Symbol* sig = cp->uncached_signature_ref_at(index);
2033 fieldDescriptor fd;
2034 Klass* target_klass = k->find_field(name, sig, &fd);
2035 if (target_klass == NULL) {
2036 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2037 }
2038 oop field = Reflection::new_field(&fd, CHECK_NULL);
2039 return JNIHandles::make_local(field);
2040 }
2041
2042 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2043 {
2044 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2045 JvmtiVMObjectAllocEventCollector oam;
2046 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2047 bounds_check(cp, index, CHECK_NULL);
2048 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2049 return res;
2050 }
2051 JVM_END
2052
2053 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2054 {
2055 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2056 JvmtiVMObjectAllocEventCollector oam;
2057 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2058 bounds_check(cp, index, CHECK_NULL);
2059 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2060 return res;
2061 }
2062 JVM_END
2063
2064 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2065 {
2066 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2067 JvmtiVMObjectAllocEventCollector oam;
2068 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2069 bounds_check(cp, index, CHECK_NULL);
2070 constantTag tag = cp->tag_at(index);
2071 if (!tag.is_field_or_method()) {
2072 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2073 }
2074 int klass_ref = cp->uncached_klass_ref_index_at(index);
2075 Symbol* klass_name = cp->klass_name_at(klass_ref);
2076 Symbol* member_name = cp->uncached_name_ref_at(index);
2077 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2078 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2079 objArrayHandle dest(THREAD, dest_o);
2080 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2081 dest->obj_at_put(0, str());
2082 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2083 dest->obj_at_put(1, str());
2084 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2085 dest->obj_at_put(2, str());
2086 return (jobjectArray) JNIHandles::make_local(dest());
2087 }
2088 JVM_END
2089
2090 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2091 {
2092 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2093 JvmtiVMObjectAllocEventCollector oam;
2094 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2095 bounds_check(cp, index, CHECK_0);
2096 constantTag tag = cp->tag_at(index);
2097 if (!tag.is_field_or_method()) {
2098 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2099 }
2100 return (jint) cp->uncached_klass_ref_index_at(index);
2101 }
2102 JVM_END
2103
2104 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2105 {
2106 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2107 JvmtiVMObjectAllocEventCollector oam;
2108 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2109 bounds_check(cp, index, CHECK_0);
2110 constantTag tag = cp->tag_at(index);
2111 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2112 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2113 }
2114 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2115 }
2116 JVM_END
2117
2118 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2119 {
2120 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2121 JvmtiVMObjectAllocEventCollector oam;
2122 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2123 bounds_check(cp, index, CHECK_NULL);
2124 constantTag tag = cp->tag_at(index);
2125 if (!tag.is_name_and_type()) {
2126 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2127 }
2128 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2129 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2130 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2131 objArrayHandle dest(THREAD, dest_o);
2132 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2133 dest->obj_at_put(0, str());
2134 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2135 dest->obj_at_put(1, str());
2136 return (jobjectArray) JNIHandles::make_local(dest());
2137 }
2138 JVM_END
2139
2140 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2141 {
2142 JVMWrapper("JVM_ConstantPoolGetIntAt");
2143 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2144 bounds_check(cp, index, CHECK_0);
2145 constantTag tag = cp->tag_at(index);
2146 if (!tag.is_int()) {
2147 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2148 }
2149 return cp->int_at(index);
2150 }
2151 JVM_END
2152
2153 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2154 {
2155 JVMWrapper("JVM_ConstantPoolGetLongAt");
2156 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2157 bounds_check(cp, index, CHECK_(0L));
2158 constantTag tag = cp->tag_at(index);
2159 if (!tag.is_long()) {
2160 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2161 }
2162 return cp->long_at(index);
2163 }
2164 JVM_END
2165
2166 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2167 {
2168 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2169 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2170 bounds_check(cp, index, CHECK_(0.0f));
2171 constantTag tag = cp->tag_at(index);
2172 if (!tag.is_float()) {
2173 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2174 }
2175 return cp->float_at(index);
2176 }
2177 JVM_END
2178
2179 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2180 {
2181 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2182 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2183 bounds_check(cp, index, CHECK_(0.0));
2184 constantTag tag = cp->tag_at(index);
2185 if (!tag.is_double()) {
2186 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2187 }
2188 return cp->double_at(index);
2189 }
2190 JVM_END
2191
2192 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2193 {
2194 JVMWrapper("JVM_ConstantPoolGetStringAt");
2195 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2196 bounds_check(cp, index, CHECK_NULL);
2197 constantTag tag = cp->tag_at(index);
2198 if (!tag.is_string()) {
2199 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2200 }
2201 oop str = cp->string_at(index, CHECK_NULL);
2202 return (jstring) JNIHandles::make_local(str);
2203 }
2204 JVM_END
2205
2206 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2207 {
2208 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2209 JvmtiVMObjectAllocEventCollector oam;
2210 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2211 bounds_check(cp, index, CHECK_NULL);
2212 constantTag tag = cp->tag_at(index);
2213 if (!tag.is_symbol()) {
2214 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2215 }
2216 Symbol* sym = cp->symbol_at(index);
2217 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2218 return (jstring) JNIHandles::make_local(str());
2219 }
2220 JVM_END
2221
2222 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2223 {
2224 JVMWrapper("JVM_ConstantPoolGetTagAt");
2225 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2226 bounds_check(cp, index, CHECK_0);
2227 constantTag tag = cp->tag_at(index);
2228 jbyte result = tag.value();
2229 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2230 // they are changed to the corresponding tags from the JVM spec, so that java code in
2231 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2232 if (tag.is_klass_or_reference()) {
2233 result = JVM_CONSTANT_Class;
2234 } else if (tag.is_string_index()) {
2235 result = JVM_CONSTANT_String;
2236 } else if (tag.is_method_type_in_error()) {
2237 result = JVM_CONSTANT_MethodType;
2238 } else if (tag.is_method_handle_in_error()) {
2239 result = JVM_CONSTANT_MethodHandle;
2240 }
2241 return result;
2242 }
2243 JVM_END
2244
2245 // Assertion support. //////////////////////////////////////////////////////////
2246
2247 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2248 JVMWrapper("JVM_DesiredAssertionStatus");
2249 assert(cls != NULL, "bad class");
2250
2251 oop r = JNIHandles::resolve(cls);
2252 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2253 if (java_lang_Class::is_primitive(r)) return false;
2254
2255 Klass* k = java_lang_Class::as_Klass(r);
2256 assert(k->is_instance_klass(), "must be an instance klass");
2257 if (!k->is_instance_klass()) return false;
2258
2259 ResourceMark rm(THREAD);
2260 const char* name = k->name()->as_C_string();
2261 bool system_class = k->class_loader() == NULL;
2262 return JavaAssertions::enabled(name, system_class);
2263
2264 JVM_END
2265
2266
2267 // Return a new AssertionStatusDirectives object with the fields filled in with
2268 // command-line assertion arguments (i.e., -ea, -da).
2269 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2270 JVMWrapper("JVM_AssertionStatusDirectives");
2271 JvmtiVMObjectAllocEventCollector oam;
2272 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2273 return JNIHandles::make_local(env, asd);
2274 JVM_END
2275
2276 // Verification ////////////////////////////////////////////////////////////////////////////////
2277
2278 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2279
2280 // RedefineClasses support: bug 6214132 caused verification to fail.
2281 // All functions from this section should call the jvmtiThreadSate function:
2282 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2283 // The function returns a Klass* of the _scratch_class if the verifier
2284 // was invoked in the middle of the class redefinition.
2285 // Otherwise it returns its argument value which is the _the_class Klass*.
2286 // Please, refer to the description in the jvmtiThreadSate.hpp.
2287
2288 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2289 JVMWrapper("JVM_GetClassNameUTF");
2290 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2291 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2292 return k->name()->as_utf8();
2293 JVM_END
2294
2295
2296 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2297 JVMWrapper("JVM_GetClassCPTypes");
2298 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2299 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2300 // types will have length zero if this is not an InstanceKlass
2301 // (length is determined by call to JVM_GetClassCPEntriesCount)
2302 if (k->is_instance_klass()) {
2303 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2304 for (int index = cp->length() - 1; index >= 0; index--) {
2305 constantTag tag = cp->tag_at(index);
2306 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2307 }
2308 }
2309 JVM_END
2310
2311
2312 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2313 JVMWrapper("JVM_GetClassCPEntriesCount");
2314 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2315 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2316 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2317 JVM_END
2318
2319
2320 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2321 JVMWrapper("JVM_GetClassFieldsCount");
2322 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2323 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2324 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2325 JVM_END
2326
2327
2328 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2329 JVMWrapper("JVM_GetClassMethodsCount");
2330 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2331 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2332 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2333 JVM_END
2334
2335
2336 // The following methods, used for the verifier, are never called with
2337 // array klasses, so a direct cast to InstanceKlass is safe.
2338 // Typically, these methods are called in a loop with bounds determined
2339 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2340 // zero for arrays.
2341 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2342 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2343 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2344 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2345 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2346 int length = method->checked_exceptions_length();
2347 if (length > 0) {
2348 CheckedExceptionElement* table= method->checked_exceptions_start();
2349 for (int i = 0; i < length; i++) {
2350 exceptions[i] = table[i].class_cp_index;
2351 }
2352 }
2353 JVM_END
2354
2355
2356 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2357 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2358 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2359 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2360 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2361 return method->checked_exceptions_length();
2362 JVM_END
2363
2364
2365 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2366 JVMWrapper("JVM_GetMethodIxByteCode");
2367 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2368 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2369 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2370 memcpy(code, method->code_base(), method->code_size());
2371 JVM_END
2372
2373
2374 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2375 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2376 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2377 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2378 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2379 return method->code_size();
2380 JVM_END
2381
2382
2383 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2384 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2385 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2386 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2387 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2388 ExceptionTable extable(method);
2389 entry->start_pc = extable.start_pc(entry_index);
2390 entry->end_pc = extable.end_pc(entry_index);
2391 entry->handler_pc = extable.handler_pc(entry_index);
2392 entry->catchType = extable.catch_type_index(entry_index);
2393 JVM_END
2394
2395
2396 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2397 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2398 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2399 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2400 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2401 return method->exception_table_length();
2402 JVM_END
2403
2404
2405 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2406 JVMWrapper("JVM_GetMethodIxModifiers");
2407 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2408 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2409 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2410 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2411 JVM_END
2412
2413
2414 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2415 JVMWrapper("JVM_GetFieldIxModifiers");
2416 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2417 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2418 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2419 JVM_END
2420
2421
2422 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2423 JVMWrapper("JVM_GetMethodIxLocalsCount");
2424 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2425 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2426 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2427 return method->max_locals();
2428 JVM_END
2429
2430
2431 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2432 JVMWrapper("JVM_GetMethodIxArgsSize");
2433 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2434 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2435 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2436 return method->size_of_parameters();
2437 JVM_END
2438
2439
2440 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2441 JVMWrapper("JVM_GetMethodIxMaxStack");
2442 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2443 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2444 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2445 return method->verifier_max_stack();
2446 JVM_END
2447
2448
2449 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2450 JVMWrapper("JVM_IsConstructorIx");
2451 ResourceMark rm(THREAD);
2452 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2453 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2454 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2455 return method->name() == vmSymbols::object_initializer_name();
2456 JVM_END
2457
2458
2459 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2460 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2461 ResourceMark rm(THREAD);
2462 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2463 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2464 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2465 return method->is_overpass();
2466 JVM_END
2467
2468 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2469 JVMWrapper("JVM_GetMethodIxIxUTF");
2470 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2471 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2472 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2473 return method->name()->as_utf8();
2474 JVM_END
2475
2476
2477 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2478 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2479 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2480 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2481 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2482 return method->signature()->as_utf8();
2483 JVM_END
2484
2485 /**
2486 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2487 * read entries in the constant pool. Since the old verifier always
2488 * works on a copy of the code, it will not see any rewriting that
2489 * may possibly occur in the middle of verification. So it is important
2490 * that nothing it calls tries to use the cpCache instead of the raw
2491 * constant pool, so we must use cp->uncached_x methods when appropriate.
2492 */
2493 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2494 JVMWrapper("JVM_GetCPFieldNameUTF");
2495 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2496 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2497 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2498 switch (cp->tag_at(cp_index).value()) {
2499 case JVM_CONSTANT_Fieldref:
2500 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2501 default:
2502 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2503 }
2504 ShouldNotReachHere();
2505 return NULL;
2506 JVM_END
2507
2508
2509 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2510 JVMWrapper("JVM_GetCPMethodNameUTF");
2511 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2512 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2513 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2514 switch (cp->tag_at(cp_index).value()) {
2515 case JVM_CONSTANT_InterfaceMethodref:
2516 case JVM_CONSTANT_Methodref:
2517 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2518 default:
2519 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2520 }
2521 ShouldNotReachHere();
2522 return NULL;
2523 JVM_END
2524
2525
2526 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2527 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2528 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2529 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2530 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2531 switch (cp->tag_at(cp_index).value()) {
2532 case JVM_CONSTANT_InterfaceMethodref:
2533 case JVM_CONSTANT_Methodref:
2534 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2535 default:
2536 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2537 }
2538 ShouldNotReachHere();
2539 return NULL;
2540 JVM_END
2541
2542
2543 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2544 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2545 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2546 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2547 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2548 switch (cp->tag_at(cp_index).value()) {
2549 case JVM_CONSTANT_Fieldref:
2550 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2551 default:
2552 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2553 }
2554 ShouldNotReachHere();
2555 return NULL;
2556 JVM_END
2557
2558
2559 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2560 JVMWrapper("JVM_GetCPClassNameUTF");
2561 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2562 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2563 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2564 Symbol* classname = cp->klass_name_at(cp_index);
2565 return classname->as_utf8();
2566 JVM_END
2567
2568
2569 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2570 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2572 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2573 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2574 switch (cp->tag_at(cp_index).value()) {
2575 case JVM_CONSTANT_Fieldref: {
2576 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2577 Symbol* classname = cp->klass_name_at(class_index);
2578 return classname->as_utf8();
2579 }
2580 default:
2581 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2582 }
2583 ShouldNotReachHere();
2584 return NULL;
2585 JVM_END
2586
2587
2588 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2589 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2590 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2591 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2592 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2593 switch (cp->tag_at(cp_index).value()) {
2594 case JVM_CONSTANT_Methodref:
2595 case JVM_CONSTANT_InterfaceMethodref: {
2596 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2597 Symbol* classname = cp->klass_name_at(class_index);
2598 return classname->as_utf8();
2599 }
2600 default:
2601 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2602 }
2603 ShouldNotReachHere();
2604 return NULL;
2605 JVM_END
2606
2607
2608 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2609 JVMWrapper("JVM_GetCPFieldModifiers");
2610 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2611 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2612 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2613 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2614 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2615 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2616 switch (cp->tag_at(cp_index).value()) {
2617 case JVM_CONSTANT_Fieldref: {
2618 Symbol* name = cp->uncached_name_ref_at(cp_index);
2619 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2620 InstanceKlass* ik = InstanceKlass::cast(k_called);
2621 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2622 if (fs.name() == name && fs.signature() == signature) {
2623 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2624 }
2625 }
2626 return -1;
2627 }
2628 default:
2629 fatal("JVM_GetCPFieldModifiers: illegal constant");
2630 }
2631 ShouldNotReachHere();
2632 return 0;
2633 JVM_END
2634
2635
2636 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2637 JVMWrapper("JVM_GetCPMethodModifiers");
2638 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2639 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2640 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2641 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2642 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2643 switch (cp->tag_at(cp_index).value()) {
2644 case JVM_CONSTANT_Methodref:
2645 case JVM_CONSTANT_InterfaceMethodref: {
2646 Symbol* name = cp->uncached_name_ref_at(cp_index);
2647 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2648 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2649 int methods_count = methods->length();
2650 for (int i = 0; i < methods_count; i++) {
2651 Method* method = methods->at(i);
2652 if (method->name() == name && method->signature() == signature) {
2653 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2654 }
2655 }
2656 return -1;
2657 }
2658 default:
2659 fatal("JVM_GetCPMethodModifiers: illegal constant");
2660 }
2661 ShouldNotReachHere();
2662 return 0;
2663 JVM_END
2664
2665
2666 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2667
2668 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2669 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2670 JVM_END
2671
2672
2673 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2674 JVMWrapper("JVM_IsSameClassPackage");
2675 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2676 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2677 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2678 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2679 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2680 JVM_END
2681
2682 // Printing support //////////////////////////////////////////////////
2683 extern "C" {
2684
2685 ATTRIBUTE_PRINTF(3, 0)
2686 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2687 // see bug 4399518, 4417214
2688 if ((intptr_t)count <= 0) return -1;
2689
2690 int result = vsnprintf(str, count, fmt, args);
2691 // Note: on truncation vsnprintf(3) on Unix returns numbers of
2692 // characters which would have been written had the buffer been large
2693 // enough; on Windows, it returns -1. We handle both cases here and
2694 // always return -1, and perform null termination.
2695 if ((result > 0 && (size_t)result >= count) || result == -1) {
2696 str[count - 1] = '\0';
2697 result = -1;
2698 }
2699
2700 return result;
2701 }
2702
2703 ATTRIBUTE_PRINTF(3, 0)
2704 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2705 va_list args;
2706 int len;
2707 va_start(args, fmt);
2708 len = jio_vsnprintf(str, count, fmt, args);
2709 va_end(args);
2710 return len;
2711 }
2712
2713 ATTRIBUTE_PRINTF(2,3)
2714 int jio_fprintf(FILE* f, const char *fmt, ...) {
2715 int len;
2716 va_list args;
2717 va_start(args, fmt);
2718 len = jio_vfprintf(f, fmt, args);
2719 va_end(args);
2720 return len;
2721 }
2722
2723 ATTRIBUTE_PRINTF(2, 0)
2724 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2725 if (Arguments::vfprintf_hook() != NULL) {
2726 return Arguments::vfprintf_hook()(f, fmt, args);
2727 } else {
2728 return vfprintf(f, fmt, args);
2729 }
2730 }
2731
2732 ATTRIBUTE_PRINTF(1, 2)
2733 JNIEXPORT int jio_printf(const char *fmt, ...) {
2734 int len;
2735 va_list args;
2736 va_start(args, fmt);
2737 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2738 va_end(args);
2739 return len;
2740 }
2741
2742
2743 // HotSpot specific jio method
2744 void jio_print(const char* s) {
2745 // Try to make this function as atomic as possible.
2746 if (Arguments::vfprintf_hook() != NULL) {
2747 jio_fprintf(defaultStream::output_stream(), "%s", s);
2748 } else {
2749 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2750 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2751 }
2752 }
2753
2754 } // Extern C
2755
2756 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2757
2758 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2759 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2760 // OSThread objects. The exception to this rule is when the target object is the thread
2761 // doing the operation, in which case we know that the thread won't exit until the
2762 // operation is done (all exits being voluntary). There are a few cases where it is
2763 // rather silly to do operations on yourself, like resuming yourself or asking whether
2764 // you are alive. While these can still happen, they are not subject to deadlocks if
2765 // the lock is held while the operation occurs (this is not the case for suspend, for
2766 // instance), and are very unlikely. Because IsAlive needs to be fast and its
2767 // implementation is local to this file, we always lock Threads_lock for that one.
2768
2769 static void thread_entry(JavaThread* thread, TRAPS) {
2770 HandleMark hm(THREAD);
2771 Handle obj(THREAD, thread->threadObj());
2772 JavaValue result(T_VOID);
2773 JavaCalls::call_virtual(&result,
2774 obj,
2775 SystemDictionary::Thread_klass(),
2776 vmSymbols::run_method_name(),
2777 vmSymbols::void_method_signature(),
2778 THREAD);
2779 }
2780
2781
2782 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2783 JVMWrapper("JVM_StartThread");
2784 JavaThread *native_thread = NULL;
2785
2786 // We cannot hold the Threads_lock when we throw an exception,
2787 // due to rank ordering issues. Example: we might need to grab the
2788 // Heap_lock while we construct the exception.
2789 bool throw_illegal_thread_state = false;
2790
2791 // We must release the Threads_lock before we can post a jvmti event
2792 // in Thread::start.
2793 {
2794 // Ensure that the C++ Thread and OSThread structures aren't freed before
2795 // we operate.
2796 MutexLocker mu(Threads_lock);
2797
2798 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2799 // re-starting an already started thread, so we should usually find
2800 // that the JavaThread is null. However for a JNI attached thread
2801 // there is a small window between the Thread object being created
2802 // (with its JavaThread set) and the update to its threadStatus, so we
2803 // have to check for this
2804 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2805 throw_illegal_thread_state = true;
2806 } else {
2807 // We could also check the stillborn flag to see if this thread was already stopped, but
2808 // for historical reasons we let the thread detect that itself when it starts running
2809
2810 jlong size =
2811 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2812 // Allocate the C++ Thread structure and create the native thread. The
2813 // stack size retrieved from java is 64-bit signed, but the constructor takes
2814 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2815 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2816 // - Avoid passing negative values which would result in really large stacks.
2817 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2818 size_t sz = size > 0 ? (size_t) size : 0;
2819 native_thread = new JavaThread(&thread_entry, sz);
2820
2821 // At this point it may be possible that no osthread was created for the
2822 // JavaThread due to lack of memory. Check for this situation and throw
2823 // an exception if necessary. Eventually we may want to change this so
2824 // that we only grab the lock if the thread was created successfully -
2825 // then we can also do this check and throw the exception in the
2826 // JavaThread constructor.
2827 if (native_thread->osthread() != NULL) {
2828 // Note: the current thread is not being used within "prepare".
2829 native_thread->prepare(jthread);
2830 }
2831 }
2832 }
2833
2834 if (throw_illegal_thread_state) {
2835 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2836 }
2837
2838 assert(native_thread != NULL, "Starting null thread?");
2839
2840 if (native_thread->osthread() == NULL) {
2841 // No one should hold a reference to the 'native_thread'.
2842 delete native_thread;
2843 if (JvmtiExport::should_post_resource_exhausted()) {
2844 JvmtiExport::post_resource_exhausted(
2845 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2846 os::native_thread_creation_failed_msg());
2847 }
2848 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2849 os::native_thread_creation_failed_msg());
2850 }
2851
2852 Thread::start(native_thread);
2853
2854 JVM_END
2855
2856 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2857 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2858 // but is thought to be reliable and simple. In the case, where the receiver is the
2859 // same thread as the sender, no safepoint is needed.
2860 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2861 JVMWrapper("JVM_StopThread");
2862
2863 oop java_throwable = JNIHandles::resolve(throwable);
2864 if (java_throwable == NULL) {
2865 THROW(vmSymbols::java_lang_NullPointerException());
2866 }
2867 oop java_thread = JNIHandles::resolve_non_null(jthread);
2868 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2869 Events::log_exception(JavaThread::current(),
2870 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2871 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2872 // First check if thread is alive
2873 if (receiver != NULL) {
2874 // Check if exception is getting thrown at self (use oop equality, since the
2875 // target object might exit)
2876 if (java_thread == thread->threadObj()) {
2877 THROW_OOP(java_throwable);
2878 } else {
2879 // Enques a VM_Operation to stop all threads and then deliver the exception...
2880 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2881 }
2882 }
2883 else {
2884 // Either:
2885 // - target thread has not been started before being stopped, or
2886 // - target thread already terminated
2887 // We could read the threadStatus to determine which case it is
2888 // but that is overkill as it doesn't matter. We must set the
2889 // stillborn flag for the first case, and if the thread has already
2890 // exited setting this flag has no affect
2891 java_lang_Thread::set_stillborn(java_thread);
2892 }
2893 JVM_END
2894
2895
2896 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2897 JVMWrapper("JVM_IsThreadAlive");
2898
2899 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2900 return java_lang_Thread::is_alive(thread_oop);
2901 JVM_END
2902
2903
2904 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2905 JVMWrapper("JVM_SuspendThread");
2906 oop java_thread = JNIHandles::resolve_non_null(jthread);
2907 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2908
2909 if (receiver != NULL) {
2910 // thread has run and has not exited (still on threads list)
2911
2912 {
2913 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2914 if (receiver->is_external_suspend()) {
2915 // Don't allow nested external suspend requests. We can't return
2916 // an error from this interface so just ignore the problem.
2917 return;
2918 }
2919 if (receiver->is_exiting()) { // thread is in the process of exiting
2920 return;
2921 }
2922 receiver->set_external_suspend();
2923 }
2924
2925 // java_suspend() will catch threads in the process of exiting
2926 // and will ignore them.
2927 receiver->java_suspend();
2928
2929 // It would be nice to have the following assertion in all the
2930 // time, but it is possible for a racing resume request to have
2931 // resumed this thread right after we suspended it. Temporarily
2932 // enable this assertion if you are chasing a different kind of
2933 // bug.
2934 //
2935 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2936 // receiver->is_being_ext_suspended(), "thread is not suspended");
2937 }
2938 JVM_END
2939
2940
2941 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2942 JVMWrapper("JVM_ResumeThread");
2943 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2944 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2945 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2946 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2947 // looks at it.
2948 MutexLocker ml(Threads_lock);
2949 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2950 if (thr != NULL) {
2951 // the thread has run and is not in the process of exiting
2952 thr->java_resume();
2953 }
2954 JVM_END
2955
2956
2957 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2958 JVMWrapper("JVM_SetThreadPriority");
2959 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2960 MutexLocker ml(Threads_lock);
2961 oop java_thread = JNIHandles::resolve_non_null(jthread);
2962 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2963 JavaThread* thr = java_lang_Thread::thread(java_thread);
2964 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
2965 Thread::set_priority(thr, (ThreadPriority)prio);
2966 }
2967 JVM_END
2968
2969
2970 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2971 JVMWrapper("JVM_Yield");
2972 if (os::dont_yield()) return;
2973 HOTSPOT_THREAD_YIELD();
2974 os::naked_yield();
2975 JVM_END
2976
2977
2978 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2979 JVMWrapper("JVM_Sleep");
2980
2981 if (millis < 0) {
2982 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2983 }
2984
2985 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2986 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2987 }
2988
2989 // Save current thread state and restore it at the end of this block.
2990 // And set new thread state to SLEEPING.
2991 JavaThreadSleepState jtss(thread);
2992
2993 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2994
2995 EventThreadSleep event;
2996
2997 if (millis == 0) {
2998 os::naked_yield();
2999 } else {
3000 ThreadState old_state = thread->osthread()->get_state();
3001 thread->osthread()->set_state(SLEEPING);
3002 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3003 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3004 // us while we were sleeping. We do not overwrite those.
3005 if (!HAS_PENDING_EXCEPTION) {
3006 if (event.should_commit()) {
3007 event.set_time(millis);
3008 event.commit();
3009 }
3010 HOTSPOT_THREAD_SLEEP_END(1);
3011
3012 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3013 // to properly restore the thread state. That's likely wrong.
3014 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3015 }
3016 }
3017 thread->osthread()->set_state(old_state);
3018 }
3019 if (event.should_commit()) {
3020 event.set_time(millis);
3021 event.commit();
3022 }
3023 HOTSPOT_THREAD_SLEEP_END(0);
3024 JVM_END
3025
3026 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3027 JVMWrapper("JVM_CurrentThread");
3028 oop jthread = thread->threadObj();
3029 assert (thread != NULL, "no current thread!");
3030 return JNIHandles::make_local(env, jthread);
3031 JVM_END
3032
3033
3034 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3035 JVMWrapper("JVM_CountStackFrames");
3036
3037 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3038 oop java_thread = JNIHandles::resolve_non_null(jthread);
3039 bool throw_illegal_thread_state = false;
3040 int count = 0;
3041
3042 {
3043 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3044 // We need to re-resolve the java_thread, since a GC might have happened during the
3045 // acquire of the lock
3046 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3047
3048 if (thr == NULL) {
3049 // do nothing
3050 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
3051 // Check whether this java thread has been suspended already. If not, throws
3052 // IllegalThreadStateException. We defer to throw that exception until
3053 // Threads_lock is released since loading exception class has to leave VM.
3054 // The correct way to test a thread is actually suspended is
3055 // wait_for_ext_suspend_completion(), but we can't call that while holding
3056 // the Threads_lock. The above tests are sufficient for our purposes
3057 // provided the walkability of the stack is stable - which it isn't
3058 // 100% but close enough for most practical purposes.
3059 throw_illegal_thread_state = true;
3060 } else {
3061 // Count all java activation, i.e., number of vframes
3062 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
3063 // Native frames are not counted
3064 if (!vfst.method()->is_native()) count++;
3065 }
3066 }
3067 }
3068
3069 if (throw_illegal_thread_state) {
3070 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3071 "this thread is not suspended");
3072 }
3073 return count;
3074 JVM_END
3075
3076 // Consider: A better way to implement JVM_Interrupt() is to acquire
3077 // Threads_lock to resolve the jthread into a Thread pointer, fetch
3078 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
3079 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
3080 // outside the critical section. Threads_lock is hot so we want to minimize
3081 // the hold-time. A cleaner interface would be to decompose interrupt into
3082 // two steps. The 1st phase, performed under Threads_lock, would return
3083 // a closure that'd be invoked after Threads_lock was dropped.
3084 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
3085 // admit spurious wakeups.
3086
3087 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3088 JVMWrapper("JVM_Interrupt");
3089
3090 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3091 oop java_thread = JNIHandles::resolve_non_null(jthread);
3092 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3093 // We need to re-resolve the java_thread, since a GC might have happened during the
3094 // acquire of the lock
3095 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3096 if (thr != NULL) {
3097 Thread::interrupt(thr);
3098 }
3099 JVM_END
3100
3101
3102 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3103 JVMWrapper("JVM_IsInterrupted");
3104
3105 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3106 oop java_thread = JNIHandles::resolve_non_null(jthread);
3107 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3108 // We need to re-resolve the java_thread, since a GC might have happened during the
3109 // acquire of the lock
3110 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3111 if (thr == NULL) {
3112 return JNI_FALSE;
3113 } else {
3114 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3115 }
3116 JVM_END
3117
3118
3119 // Return true iff the current thread has locked the object passed in
3120
3121 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3122 JVMWrapper("JVM_HoldsLock");
3123 assert(THREAD->is_Java_thread(), "sanity check");
3124 if (obj == NULL) {
3125 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3126 }
3127 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3128 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3129 JVM_END
3130
3131
3132 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3133 JVMWrapper("JVM_DumpAllStacks");
3134 VM_PrintThreads op;
3135 VMThread::execute(&op);
3136 if (JvmtiExport::should_post_data_dump()) {
3137 JvmtiExport::post_data_dump();
3138 }
3139 JVM_END
3140
3141 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3142 JVMWrapper("JVM_SetNativeThreadName");
3143 ResourceMark rm(THREAD);
3144 oop java_thread = JNIHandles::resolve_non_null(jthread);
3145 JavaThread* thr = java_lang_Thread::thread(java_thread);
3146 // Thread naming only supported for the current thread, doesn't work for
3147 // target threads.
3148 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3149 // we don't set the name of an attached thread to avoid stepping
3150 // on other programs
3151 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3152 os::set_native_thread_name(thread_name);
3153 }
3154 JVM_END
3155
3156 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3157
3158 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3159 assert(jthread->is_Java_thread(), "must be a Java thread");
3160 if (jthread->privileged_stack_top() == NULL) return false;
3161 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3162 oop loader = jthread->privileged_stack_top()->class_loader();
3163 if (loader == NULL) return true;
3164 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3165 if (trusted) return true;
3166 }
3167 return false;
3168 }
3169
3170 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3171 JVMWrapper("JVM_CurrentLoadedClass");
3172 ResourceMark rm(THREAD);
3173
3174 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3175 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3176 bool trusted = is_trusted_frame(thread, &vfst);
3177 if (trusted) return NULL;
3178
3179 Method* m = vfst.method();
3180 if (!m->is_native()) {
3181 InstanceKlass* holder = m->method_holder();
3182 oop loader = holder->class_loader();
3183 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3184 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3185 }
3186 }
3187 }
3188 return NULL;
3189 JVM_END
3190
3191
3192 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3193 JVMWrapper("JVM_CurrentClassLoader");
3194 ResourceMark rm(THREAD);
3195
3196 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3197
3198 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3199 bool trusted = is_trusted_frame(thread, &vfst);
3200 if (trusted) return NULL;
3201
3202 Method* m = vfst.method();
3203 if (!m->is_native()) {
3204 InstanceKlass* holder = m->method_holder();
3205 assert(holder->is_klass(), "just checking");
3206 oop loader = holder->class_loader();
3207 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3208 return JNIHandles::make_local(env, loader);
3209 }
3210 }
3211 }
3212 return NULL;
3213 JVM_END
3214
3215
3216 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3217 JVMWrapper("JVM_GetClassContext");
3218 ResourceMark rm(THREAD);
3219 JvmtiVMObjectAllocEventCollector oam;
3220 vframeStream vfst(thread);
3221
3222 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3223 // This must only be called from SecurityManager.getClassContext
3224 Method* m = vfst.method();
3225 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3226 m->name() == vmSymbols::getClassContext_name() &&
3227 m->signature() == vmSymbols::void_class_array_signature())) {
3228 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3229 }
3230 }
3231
3232 // Collect method holders
3233 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3234 for (; !vfst.at_end(); vfst.security_next()) {
3235 Method* m = vfst.method();
3236 // Native frames are not returned
3237 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3238 Klass* holder = m->method_holder();
3239 assert(holder->is_klass(), "just checking");
3240 klass_array->append(holder);
3241 }
3242 }
3243
3244 // Create result array of type [Ljava/lang/Class;
3245 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3246 // Fill in mirrors corresponding to method holders
3247 for (int i = 0; i < klass_array->length(); i++) {
3248 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3249 }
3250
3251 return (jobjectArray) JNIHandles::make_local(env, result);
3252 JVM_END
3253
3254
3255 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3256 JVMWrapper("JVM_ClassDepth");
3257 ResourceMark rm(THREAD);
3258 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3259 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3260
3261 const char* str = java_lang_String::as_utf8_string(class_name_str());
3262 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3263 if (class_name_sym == NULL) {
3264 return -1;
3265 }
3266
3267 int depth = 0;
3268
3269 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3270 if (!vfst.method()->is_native()) {
3271 InstanceKlass* holder = vfst.method()->method_holder();
3272 assert(holder->is_klass(), "just checking");
3273 if (holder->name() == class_name_sym) {
3274 return depth;
3275 }
3276 depth++;
3277 }
3278 }
3279 return -1;
3280 JVM_END
3281
3282
3283 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3284 JVMWrapper("JVM_ClassLoaderDepth");
3285 ResourceMark rm(THREAD);
3286 int depth = 0;
3287 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3288 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3289 bool trusted = is_trusted_frame(thread, &vfst);
3290 if (trusted) return -1;
3291
3292 Method* m = vfst.method();
3293 if (!m->is_native()) {
3294 InstanceKlass* holder = m->method_holder();
3295 assert(holder->is_klass(), "just checking");
3296 oop loader = holder->class_loader();
3297 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3298 return depth;
3299 }
3300 depth++;
3301 }
3302 }
3303 return -1;
3304 JVM_END
3305
3306
3307 // java.lang.Package ////////////////////////////////////////////////////////////////
3308
3309
3310 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3311 JVMWrapper("JVM_GetSystemPackage");
3312 ResourceMark rm(THREAD);
3313 JvmtiVMObjectAllocEventCollector oam;
3314 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3315 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3316 return (jstring) JNIHandles::make_local(result);
3317 JVM_END
3318
3319
3320 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3321 JVMWrapper("JVM_GetSystemPackages");
3322 JvmtiVMObjectAllocEventCollector oam;
3323 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3324 return (jobjectArray) JNIHandles::make_local(result);
3325 JVM_END
3326
3327
3328 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3329
3330
3331 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3332 JVMWrapper("JVM_GetAndClearReferencePendingList");
3333
3334 MonitorLockerEx ml(Heap_lock);
3335 oop ref = Universe::reference_pending_list();
3336 if (ref != NULL) {
3337 Universe::set_reference_pending_list(NULL);
3338 }
3339 return JNIHandles::make_local(env, ref);
3340 JVM_END
3341
3342 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3343 JVMWrapper("JVM_HasReferencePendingList");
3344 MonitorLockerEx ml(Heap_lock);
3345 return Universe::has_reference_pending_list();
3346 JVM_END
3347
3348 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3349 JVMWrapper("JVM_WaitForReferencePendingList");
3350 MonitorLockerEx ml(Heap_lock);
3351 while (!Universe::has_reference_pending_list()) {
3352 ml.wait();
3353 }
3354 JVM_END
3355
3356
3357 // ObjectInputStream ///////////////////////////////////////////////////////////////
3358
3359 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3360 if (current_class == NULL) {
3361 return true;
3362 }
3363 if ((current_class == field_class) || access.is_public()) {
3364 return true;
3365 }
3366
3367 if (access.is_protected()) {
3368 // See if current_class is a subclass of field_class
3369 if (current_class->is_subclass_of(field_class)) {
3370 return true;
3371 }
3372 }
3373
3374 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3375 }
3376
3377 // Return the first user-defined class loader up the execution stack, or null
3378 // if only code from the bootstrap or platform class loader is on the stack.
3379
3380 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3381 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3382 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3383 oop loader = vfst.method()->method_holder()->class_loader();
3384 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3385 return JNIHandles::make_local(env, loader);
3386 }
3387 }
3388 return NULL;
3389 JVM_END
3390
3391
3392 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3393
3394
3395 // resolve array handle and check arguments
3396 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3397 if (arr == NULL) {
3398 THROW_0(vmSymbols::java_lang_NullPointerException());
3399 }
3400 oop a = JNIHandles::resolve_non_null(arr);
3401 if (!a->is_array()) {
3402 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3403 } else if (type_array_only && !a->is_typeArray()) {
3404 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3405 }
3406 return arrayOop(a);
3407 }
3408
3409
3410 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3411 JVMWrapper("JVM_GetArrayLength");
3412 arrayOop a = check_array(env, arr, false, CHECK_0);
3413 return a->length();
3414 JVM_END
3415
3416
3417 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3418 JVMWrapper("JVM_Array_Get");
3419 JvmtiVMObjectAllocEventCollector oam;
3420 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3421 jvalue value;
3422 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3423 oop box = Reflection::box(&value, type, CHECK_NULL);
3424 return JNIHandles::make_local(env, box);
3425 JVM_END
3426
3427
3428 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3429 JVMWrapper("JVM_GetPrimitiveArrayElement");
3430 jvalue value;
3431 value.i = 0; // to initialize value before getting used in CHECK
3432 arrayOop a = check_array(env, arr, true, CHECK_(value));
3433 assert(a->is_typeArray(), "just checking");
3434 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3435 BasicType wide_type = (BasicType) wCode;
3436 if (type != wide_type) {
3437 Reflection::widen(&value, type, wide_type, CHECK_(value));
3438 }
3439 return value;
3440 JVM_END
3441
3442
3443 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3444 JVMWrapper("JVM_SetArrayElement");
3445 arrayOop a = check_array(env, arr, false, CHECK);
3446 oop box = JNIHandles::resolve(val);
3447 jvalue value;
3448 value.i = 0; // to initialize value before getting used in CHECK
3449 BasicType value_type;
3450 if (a->is_objArray()) {
3451 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3452 value_type = Reflection::unbox_for_regular_object(box, &value);
3453 } else {
3454 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3455 }
3456 Reflection::array_set(&value, a, index, value_type, CHECK);
3457 JVM_END
3458
3459
3460 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3461 JVMWrapper("JVM_SetPrimitiveArrayElement");
3462 arrayOop a = check_array(env, arr, true, CHECK);
3463 assert(a->is_typeArray(), "just checking");
3464 BasicType value_type = (BasicType) vCode;
3465 Reflection::array_set(&v, a, index, value_type, CHECK);
3466 JVM_END
3467
3468
3469 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3470 JVMWrapper("JVM_NewArray");
3471 JvmtiVMObjectAllocEventCollector oam;
3472 oop element_mirror = JNIHandles::resolve(eltClass);
3473 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3474 return JNIHandles::make_local(env, result);
3475 JVM_END
3476
3477
3478 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3479 JVMWrapper("JVM_NewMultiArray");
3480 JvmtiVMObjectAllocEventCollector oam;
3481 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3482 oop element_mirror = JNIHandles::resolve(eltClass);
3483 assert(dim_array->is_typeArray(), "just checking");
3484 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3485 return JNIHandles::make_local(env, result);
3486 JVM_END
3487
3488
3489 // Library support ///////////////////////////////////////////////////////////////////////////
3490
3491 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3492 //%note jvm_ct
3493 JVMWrapper("JVM_LoadLibrary");
3494 char ebuf[1024];
3495 void *load_result;
3496 {
3497 ThreadToNativeFromVM ttnfvm(thread);
3498 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3499 }
3500 if (load_result == NULL) {
3501 char msg[1024];
3502 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3503 // Since 'ebuf' may contain a string encoded using
3504 // platform encoding scheme, we need to pass
3505 // Exceptions::unsafe_to_utf8 to the new_exception method
3506 // as the last argument. See bug 6367357.
3507 Handle h_exception =
3508 Exceptions::new_exception(thread,
3509 vmSymbols::java_lang_UnsatisfiedLinkError(),
3510 msg, Exceptions::unsafe_to_utf8);
3511
3512 THROW_HANDLE_0(h_exception);
3513 }
3514 return load_result;
3515 JVM_END
3516
3517
3518 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3519 JVMWrapper("JVM_UnloadLibrary");
3520 os::dll_unload(handle);
3521 JVM_END
3522
3523
3524 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3525 JVMWrapper("JVM_FindLibraryEntry");
3526 return os::dll_lookup(handle, name);
3527 JVM_END
3528
3529
3530 // JNI version ///////////////////////////////////////////////////////////////////////////////
3531
3532 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3533 JVMWrapper("JVM_IsSupportedJNIVersion");
3534 return Threads::is_supported_jni_version_including_1_1(version);
3535 JVM_END
3536
3537
3538 // String support ///////////////////////////////////////////////////////////////////////////
3539
3540 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3541 JVMWrapper("JVM_InternString");
3542 JvmtiVMObjectAllocEventCollector oam;
3543 if (str == NULL) return NULL;
3544 oop string = JNIHandles::resolve_non_null(str);
3545 oop result = StringTable::intern(string, CHECK_NULL);
3546 return (jstring) JNIHandles::make_local(env, result);
3547 JVM_END
3548
3549
3550 // Raw monitor support //////////////////////////////////////////////////////////////////////
3551
3552 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3553 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3554 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3555 // that only works with java threads.
3556
3557
3558 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3559 VM_Exit::block_if_vm_exited();
3560 JVMWrapper("JVM_RawMonitorCreate");
3561 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3562 }
3563
3564
3565 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3566 VM_Exit::block_if_vm_exited();
3567 JVMWrapper("JVM_RawMonitorDestroy");
3568 delete ((Mutex*) mon);
3569 }
3570
3571
3572 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3573 VM_Exit::block_if_vm_exited();
3574 JVMWrapper("JVM_RawMonitorEnter");
3575 ((Mutex*) mon)->jvm_raw_lock();
3576 return 0;
3577 }
3578
3579
3580 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3581 VM_Exit::block_if_vm_exited();
3582 JVMWrapper("JVM_RawMonitorExit");
3583 ((Mutex*) mon)->jvm_raw_unlock();
3584 }
3585
3586
3587 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3588
3589 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3590 Handle loader, Handle protection_domain,
3591 jboolean throwError, TRAPS) {
3592 // Security Note:
3593 // The Java level wrapper will perform the necessary security check allowing
3594 // us to pass the NULL as the initiating class loader. The VM is responsible for
3595 // the checkPackageAccess relative to the initiating class loader via the
3596 // protection_domain. The protection_domain is passed as NULL by the java code
3597 // if there is no security manager in 3-arg Class.forName().
3598 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3599
3600 // Check if we should initialize the class
3601 if (init && klass->is_instance_klass()) {
3602 klass->initialize(CHECK_NULL);
3603 }
3604 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3605 }
3606
3607
3608 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3609
3610 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3611 JVMWrapper("JVM_InvokeMethod");
3612 Handle method_handle;
3613 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3614 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3615 Handle receiver(THREAD, JNIHandles::resolve(obj));
3616 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3617 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3618 jobject res = JNIHandles::make_local(env, result);
3619 if (JvmtiExport::should_post_vm_object_alloc()) {
3620 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3621 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3622 if (java_lang_Class::is_primitive(ret_type)) {
3623 // Only for primitive type vm allocates memory for java object.
3624 // See box() method.
3625 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3626 }
3627 }
3628 return res;
3629 } else {
3630 THROW_0(vmSymbols::java_lang_StackOverflowError());
3631 }
3632 JVM_END
3633
3634
3635 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3636 JVMWrapper("JVM_NewInstanceFromConstructor");
3637 oop constructor_mirror = JNIHandles::resolve(c);
3638 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3639 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3640 jobject res = JNIHandles::make_local(env, result);
3641 if (JvmtiExport::should_post_vm_object_alloc()) {
3642 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3643 }
3644 return res;
3645 JVM_END
3646
3647 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3648
3649 JVM_LEAF(jboolean, JVM_SupportsCX8())
3650 JVMWrapper("JVM_SupportsCX8");
3651 return VM_Version::supports_cx8();
3652 JVM_END
3653
3654 // Returns an array of all live Thread objects (VM internal JavaThreads,
3655 // jvmti agent threads, and JNI attaching threads are skipped)
3656 // See CR 6404306 regarding JNI attaching threads
3657 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3658 ResourceMark rm(THREAD);
3659 ThreadsListEnumerator tle(THREAD, false, false);
3660 JvmtiVMObjectAllocEventCollector oam;
3661
3662 int num_threads = tle.num_threads();
3663 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3664 objArrayHandle threads_ah(THREAD, r);
3665
3666 for (int i = 0; i < num_threads; i++) {
3667 Handle h = tle.get_threadObj(i);
3668 threads_ah->obj_at_put(i, h());
3669 }
3670
3671 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3672 JVM_END
3673
3674
3675 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3676 // Return StackTraceElement[][], each element is the stack trace of a thread in
3677 // the corresponding entry in the given threads array
3678 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3679 JVMWrapper("JVM_DumpThreads");
3680 JvmtiVMObjectAllocEventCollector oam;
3681
3682 // Check if threads is null
3683 if (threads == NULL) {
3684 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3685 }
3686
3687 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3688 objArrayHandle ah(THREAD, a);
3689 int num_threads = ah->length();
3690 // check if threads is non-empty array
3691 if (num_threads == 0) {
3692 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3693 }
3694
3695 // check if threads is not an array of objects of Thread class
3696 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3697 if (k != SystemDictionary::Thread_klass()) {
3698 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3699 }
3700
3701 ResourceMark rm(THREAD);
3702
3703 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3704 for (int i = 0; i < num_threads; i++) {
3705 oop thread_obj = ah->obj_at(i);
3706 instanceHandle h(THREAD, (instanceOop) thread_obj);
3707 thread_handle_array->append(h);
3708 }
3709
3710 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3711 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3712
3713 JVM_END
3714
3715 // JVM monitoring and management support
3716 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3717 return Management::get_jmm_interface(version);
3718 JVM_END
3719
3720 // com.sun.tools.attach.VirtualMachine agent properties support
3721 //
3722 // Initialize the agent properties with the properties maintained in the VM
3723 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3724 JVMWrapper("JVM_InitAgentProperties");
3725 ResourceMark rm;
3726
3727 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3728
3729 PUTPROP(props, "sun.java.command", Arguments::java_command());
3730 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3731 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3732 return properties;
3733 JVM_END
3734
3735 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3736 {
3737 JVMWrapper("JVM_GetEnclosingMethodInfo");
3738 JvmtiVMObjectAllocEventCollector oam;
3739
3740 if (ofClass == NULL) {
3741 return NULL;
3742 }
3743 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3744 // Special handling for primitive objects
3745 if (java_lang_Class::is_primitive(mirror())) {
3746 return NULL;
3747 }
3748 Klass* k = java_lang_Class::as_Klass(mirror());
3749 if (!k->is_instance_klass()) {
3750 return NULL;
3751 }
3752 InstanceKlass* ik = InstanceKlass::cast(k);
3753 int encl_method_class_idx = ik->enclosing_method_class_index();
3754 if (encl_method_class_idx == 0) {
3755 return NULL;
3756 }
3757 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3758 objArrayHandle dest(THREAD, dest_o);
3759 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3760 dest->obj_at_put(0, enc_k->java_mirror());
3761 int encl_method_method_idx = ik->enclosing_method_method_index();
3762 if (encl_method_method_idx != 0) {
3763 Symbol* sym = ik->constants()->symbol_at(
3764 extract_low_short_from_int(
3765 ik->constants()->name_and_type_at(encl_method_method_idx)));
3766 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3767 dest->obj_at_put(1, str());
3768 sym = ik->constants()->symbol_at(
3769 extract_high_short_from_int(
3770 ik->constants()->name_and_type_at(encl_method_method_idx)));
3771 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3772 dest->obj_at_put(2, str());
3773 }
3774 return (jobjectArray) JNIHandles::make_local(dest());
3775 }
3776 JVM_END
3777
3778 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3779 {
3780 memset(info, 0, info_size);
3781
3782 info->jvm_version = Abstract_VM_Version::jvm_version();
3783 info->patch_version = Abstract_VM_Version::vm_patch_version();
3784
3785 // when we add a new capability in the jvm_version_info struct, we should also
3786 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3787 // counter defined in runtimeService.cpp.
3788 info->is_attachable = AttachListener::is_attach_supported();
3789 }
3790 JVM_END
3791
3792 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3793 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3794 ResourceMark rm(THREAD);
3795
3796 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3797 return NULL;
3798 }
3799
3800 char** vm_flags = Arguments::jvm_flags_array();
3801 char** vm_args = Arguments::jvm_args_array();
3802 int num_flags = Arguments::num_jvm_flags();
3803 int num_args = Arguments::num_jvm_args();
3804
3805 InstanceKlass* ik = SystemDictionary::String_klass();
3806 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3807 objArrayHandle result_h(THREAD, r);
3808
3809 int index = 0;
3810 for (int j = 0; j < num_flags; j++, index++) {
3811 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3812 result_h->obj_at_put(index, h());
3813 }
3814 for (int i = 0; i < num_args; i++, index++) {
3815 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3816 result_h->obj_at_put(index, h());
3817 }
3818 return (jobjectArray) JNIHandles::make_local(env, result_h());
3819 JVM_END
3820
3821 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3822 return os::get_signal_number(name);
3823 JVM_END