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 (size_t)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 JVM_ENTRY (void, JVM_AddModulePackage(JNIEnv *env, jobject module, const char* package))
1040 JVMWrapper("JVM_AddModulePackage");
1041 Modules::add_module_package(module, package, CHECK);
1042 JVM_END
1043
1044 // Reflection support //////////////////////////////////////////////////////////////////////////////
1045
1046 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1047 assert (cls != NULL, "illegal class");
1048 JVMWrapper("JVM_GetClassName");
1049 JvmtiVMObjectAllocEventCollector oam;
1050 ResourceMark rm(THREAD);
1051 const char* name;
1052 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1053 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1054 } else {
1055 // Consider caching interned string in Klass
1056 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1057 assert(k->is_klass(), "just checking");
1058 name = k->external_name();
1059 }
1060 oop result = StringTable::intern((char*) name, CHECK_NULL);
1061 return (jstring) JNIHandles::make_local(env, result);
1062 JVM_END
1063
1064
1065 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1066 JVMWrapper("JVM_GetClassInterfaces");
1067 JvmtiVMObjectAllocEventCollector oam;
1068 oop mirror = JNIHandles::resolve_non_null(cls);
1069
1070 // Special handling for primitive objects
1071 if (java_lang_Class::is_primitive(mirror)) {
1072 // Primitive objects does not have any interfaces
1073 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1074 return (jobjectArray) JNIHandles::make_local(env, r);
1075 }
1076
1077 Klass* klass = java_lang_Class::as_Klass(mirror);
1078 // Figure size of result array
1079 int size;
1080 if (klass->is_instance_klass()) {
1081 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1082 } else {
1083 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1084 size = 2;
1085 }
1086
1087 // Allocate result array
1088 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1089 objArrayHandle result (THREAD, r);
1090 // Fill in result
1091 if (klass->is_instance_klass()) {
1092 // Regular instance klass, fill in all local interfaces
1093 for (int index = 0; index < size; index++) {
1094 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1095 result->obj_at_put(index, k->java_mirror());
1096 }
1097 } else {
1098 // All arrays implement java.lang.Cloneable and java.io.Serializable
1099 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1100 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1101 }
1102 return (jobjectArray) JNIHandles::make_local(env, result());
1103 JVM_END
1104
1105
1106 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1107 JVMWrapper("JVM_IsInterface");
1108 oop mirror = JNIHandles::resolve_non_null(cls);
1109 if (java_lang_Class::is_primitive(mirror)) {
1110 return JNI_FALSE;
1111 }
1112 Klass* k = java_lang_Class::as_Klass(mirror);
1113 jboolean result = k->is_interface();
1114 assert(!result || k->is_instance_klass(),
1115 "all interfaces are instance types");
1116 // The compiler intrinsic for isInterface tests the
1117 // Klass::_access_flags bits in the same way.
1118 return result;
1119 JVM_END
1120
1121
1122 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1123 JVMWrapper("JVM_GetClassSigners");
1124 JvmtiVMObjectAllocEventCollector oam;
1125 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1126 // There are no signers for primitive types
1127 return NULL;
1128 }
1129
1130 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1131
1132 // If there are no signers set in the class, or if the class
1133 // is an array, return NULL.
1134 if (signers == NULL) return NULL;
1135
1136 // copy of the signers array
1137 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1138 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1139 for (int index = 0; index < signers->length(); index++) {
1140 signers_copy->obj_at_put(index, signers->obj_at(index));
1141 }
1142
1143 // return the copy
1144 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1145 JVM_END
1146
1147
1148 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1149 JVMWrapper("JVM_SetClassSigners");
1150 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1151 // This call is ignored for primitive types and arrays.
1152 // Signers are only set once, ClassLoader.java, and thus shouldn't
1153 // be called with an array. Only the bootstrap loader creates arrays.
1154 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1155 if (k->is_instance_klass()) {
1156 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1157 }
1158 }
1159 JVM_END
1160
1161
1162 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1163 JVMWrapper("JVM_GetProtectionDomain");
1164 if (JNIHandles::resolve(cls) == NULL) {
1165 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1166 }
1167
1168 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1169 // Primitive types does not have a protection domain.
1170 return NULL;
1171 }
1172
1173 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1174 return (jobject) JNIHandles::make_local(env, pd);
1175 JVM_END
1176
1177
1178 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) {
1179 // If there is a security manager and protection domain, check the access
1180 // in the protection domain, otherwise it is authorized.
1181 if (java_lang_System::has_security_manager()) {
1182
1183 // For bootstrapping, if pd implies method isn't in the JDK, allow
1184 // this context to revert to older behavior.
1185 // In this case the isAuthorized field in AccessControlContext is also not
1186 // present.
1187 if (Universe::protection_domain_implies_method() == NULL) {
1188 return true;
1189 }
1190
1191 // Whitelist certain access control contexts
1192 if (java_security_AccessControlContext::is_authorized(context)) {
1193 return true;
1194 }
1195
1196 oop prot = klass->protection_domain();
1197 if (prot != NULL) {
1198 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1199 // in the new wrapper.
1200 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1201 Handle h_prot(THREAD, prot);
1202 JavaValue result(T_BOOLEAN);
1203 JavaCallArguments args(h_prot);
1204 JavaCalls::call(&result, m, &args, CHECK_false);
1205 return (result.get_jboolean() != 0);
1206 }
1207 }
1208 return true;
1209 }
1210
1211 // Create an AccessControlContext with a protection domain with null codesource
1212 // and null permissions - which gives no permissions.
1213 oop create_dummy_access_control_context(TRAPS) {
1214 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1215 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1216 // Call constructor ProtectionDomain(null, null);
1217 JavaValue result(T_VOID);
1218 JavaCalls::call_special(&result, obj, pd_klass,
1219 vmSymbols::object_initializer_name(),
1220 vmSymbols::codesource_permissioncollection_signature(),
1221 Handle(), Handle(), CHECK_NULL);
1222
1223 // new ProtectionDomain[] {pd};
1224 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1225 context->obj_at_put(0, obj());
1226
1227 // new AccessControlContext(new ProtectionDomain[] {pd})
1228 objArrayHandle h_context(THREAD, context);
1229 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1230 return acc;
1231 }
1232
1233 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1234 JVMWrapper("JVM_DoPrivileged");
1235
1236 if (action == NULL) {
1237 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1238 }
1239
1240 // Compute the frame initiating the do privileged operation and setup the privileged stack
1241 vframeStream vfst(thread);
1242 vfst.security_get_caller_frame(1);
1243
1244 if (vfst.at_end()) {
1245 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1246 }
1247
1248 Method* method = vfst.method();
1249 InstanceKlass* klass = method->method_holder();
1250
1251 // Check that action object understands "Object run()"
1252 Handle h_context;
1253 if (context != NULL) {
1254 h_context = Handle(THREAD, JNIHandles::resolve(context));
1255 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1256 if (!authorized) {
1257 // Create an unprivileged access control object and call it's run function
1258 // instead.
1259 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1260 h_context = Handle(THREAD, noprivs);
1261 }
1262 }
1263
1264 // Check that action object understands "Object run()"
1265 Handle object (THREAD, JNIHandles::resolve(action));
1266
1267 // get run() method
1268 Method* m_oop = object->klass()->uncached_lookup_method(
1269 vmSymbols::run_method_name(),
1270 vmSymbols::void_object_signature(),
1271 Klass::find_overpass);
1272 methodHandle m (THREAD, m_oop);
1273 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1274 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1275 }
1276
1277 // Stack allocated list of privileged stack elements
1278 PrivilegedElement pi;
1279 if (!vfst.at_end()) {
1280 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1281 thread->set_privileged_stack_top(&pi);
1282 }
1283
1284
1285 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1286 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1287 Handle pending_exception;
1288 JavaValue result(T_OBJECT);
1289 JavaCallArguments args(object);
1290 JavaCalls::call(&result, m, &args, THREAD);
1291
1292 // done with action, remove ourselves from the list
1293 if (!vfst.at_end()) {
1294 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1295 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1296 }
1297
1298 if (HAS_PENDING_EXCEPTION) {
1299 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1300 CLEAR_PENDING_EXCEPTION;
1301 // JVMTI has already reported the pending exception
1302 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1303 if (THREAD->is_Java_thread()) {
1304 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1305 }
1306 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1307 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1308 // Throw a java.security.PrivilegedActionException(Exception e) exception
1309 JavaCallArguments args(pending_exception);
1310 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1311 vmSymbols::exception_void_signature(),
1312 &args);
1313 }
1314 }
1315
1316 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1317 return JNIHandles::make_local(env, (oop) result.get_jobject());
1318 JVM_END
1319
1320
1321 // Returns the inherited_access_control_context field of the running thread.
1322 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1323 JVMWrapper("JVM_GetInheritedAccessControlContext");
1324 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1325 return JNIHandles::make_local(env, result);
1326 JVM_END
1327
1328 class RegisterArrayForGC {
1329 private:
1330 JavaThread *_thread;
1331 public:
1332 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1333 _thread = thread;
1334 _thread->register_array_for_gc(array);
1335 }
1336
1337 ~RegisterArrayForGC() {
1338 _thread->register_array_for_gc(NULL);
1339 }
1340 };
1341
1342
1343 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1344 JVMWrapper("JVM_GetStackAccessControlContext");
1345 if (!UsePrivilegedStack) return NULL;
1346
1347 ResourceMark rm(THREAD);
1348 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1349 JvmtiVMObjectAllocEventCollector oam;
1350
1351 // count the protection domains on the execution stack. We collapse
1352 // duplicate consecutive protection domains into a single one, as
1353 // well as stopping when we hit a privileged frame.
1354
1355 // Use vframeStream to iterate through Java frames
1356 vframeStream vfst(thread);
1357
1358 oop previous_protection_domain = NULL;
1359 Handle privileged_context(thread, NULL);
1360 bool is_privileged = false;
1361 oop protection_domain = NULL;
1362
1363 for(; !vfst.at_end(); vfst.next()) {
1364 // get method of frame
1365 Method* method = vfst.method();
1366 intptr_t* frame_id = vfst.frame_id();
1367
1368 // check the privileged frames to see if we have a match
1369 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1370 // this frame is privileged
1371 is_privileged = true;
1372 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1373 protection_domain = thread->privileged_stack_top()->protection_domain();
1374 } else {
1375 protection_domain = method->method_holder()->protection_domain();
1376 }
1377
1378 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1379 local_array->push(protection_domain);
1380 previous_protection_domain = protection_domain;
1381 }
1382
1383 if (is_privileged) break;
1384 }
1385
1386
1387 // either all the domains on the stack were system domains, or
1388 // we had a privileged system domain
1389 if (local_array->is_empty()) {
1390 if (is_privileged && privileged_context.is_null()) return NULL;
1391
1392 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1393 return JNIHandles::make_local(env, result);
1394 }
1395
1396 // the resource area must be registered in case of a gc
1397 RegisterArrayForGC ragc(thread, local_array);
1398 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1399 local_array->length(), CHECK_NULL);
1400 objArrayHandle h_context(thread, context);
1401 for (int index = 0; index < local_array->length(); index++) {
1402 h_context->obj_at_put(index, local_array->at(index));
1403 }
1404
1405 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1406
1407 return JNIHandles::make_local(env, result);
1408 JVM_END
1409
1410
1411 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1412 JVMWrapper("JVM_IsArrayClass");
1413 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1414 return (k != NULL) && k->is_array_klass() ? true : false;
1415 JVM_END
1416
1417
1418 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1419 JVMWrapper("JVM_IsPrimitiveClass");
1420 oop mirror = JNIHandles::resolve_non_null(cls);
1421 return (jboolean) java_lang_Class::is_primitive(mirror);
1422 JVM_END
1423
1424
1425 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1426 JVMWrapper("JVM_GetClassModifiers");
1427 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1428 // Primitive type
1429 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1430 }
1431
1432 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1433 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1434 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1435 return k->modifier_flags();
1436 JVM_END
1437
1438
1439 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1440
1441 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1442 JvmtiVMObjectAllocEventCollector oam;
1443 // ofClass is a reference to a java_lang_Class object. The mirror object
1444 // of an InstanceKlass
1445
1446 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1447 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1448 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1449 return (jobjectArray)JNIHandles::make_local(env, result);
1450 }
1451
1452 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1453 InnerClassesIterator iter(k);
1454
1455 if (iter.length() == 0) {
1456 // Neither an inner nor outer class
1457 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1458 return (jobjectArray)JNIHandles::make_local(env, result);
1459 }
1460
1461 // find inner class info
1462 constantPoolHandle cp(thread, k->constants());
1463 int length = iter.length();
1464
1465 // Allocate temp. result array
1466 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1467 objArrayHandle result (THREAD, r);
1468 int members = 0;
1469
1470 for (; !iter.done(); iter.next()) {
1471 int ioff = iter.inner_class_info_index();
1472 int ooff = iter.outer_class_info_index();
1473
1474 if (ioff != 0 && ooff != 0) {
1475 // Check to see if the name matches the class we're looking for
1476 // before attempting to find the class.
1477 if (cp->klass_name_at_matches(k, ooff)) {
1478 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1479 if (outer_klass == k) {
1480 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1481 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1482
1483 // Throws an exception if outer klass has not declared k as
1484 // an inner klass
1485 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1486
1487 result->obj_at_put(members, inner_klass->java_mirror());
1488 members++;
1489 }
1490 }
1491 }
1492 }
1493
1494 if (members != length) {
1495 // Return array of right length
1496 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1497 for(int i = 0; i < members; i++) {
1498 res->obj_at_put(i, result->obj_at(i));
1499 }
1500 return (jobjectArray)JNIHandles::make_local(env, res);
1501 }
1502
1503 return (jobjectArray)JNIHandles::make_local(env, result());
1504 JVM_END
1505
1506
1507 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1508 {
1509 // ofClass is a reference to a java_lang_Class object.
1510 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1511 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1512 return NULL;
1513 }
1514
1515 bool inner_is_member = false;
1516 Klass* outer_klass
1517 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1518 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1519 if (outer_klass == NULL) return NULL; // already a top-level class
1520 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1521 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1522 }
1523 JVM_END
1524
1525 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1526 {
1527 oop mirror = JNIHandles::resolve_non_null(cls);
1528 if (java_lang_Class::is_primitive(mirror) ||
1529 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1530 return NULL;
1531 }
1532 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1533 int ooff = 0, noff = 0;
1534 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1535 if (noff != 0) {
1536 constantPoolHandle i_cp(thread, k->constants());
1537 Symbol* name = i_cp->symbol_at(noff);
1538 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1539 return (jstring) JNIHandles::make_local(env, str());
1540 }
1541 }
1542 return NULL;
1543 }
1544 JVM_END
1545
1546 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1547 assert (cls != NULL, "illegal class");
1548 JVMWrapper("JVM_GetClassSignature");
1549 JvmtiVMObjectAllocEventCollector oam;
1550 ResourceMark rm(THREAD);
1551 // Return null for arrays and primatives
1552 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1553 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1554 if (k->is_instance_klass()) {
1555 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1556 if (sym == NULL) return NULL;
1557 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1558 return (jstring) JNIHandles::make_local(env, str());
1559 }
1560 }
1561 return NULL;
1562 JVM_END
1563
1564
1565 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1566 assert (cls != NULL, "illegal class");
1567 JVMWrapper("JVM_GetClassAnnotations");
1568
1569 // Return null for arrays and primitives
1570 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1572 if (k->is_instance_klass()) {
1573 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1574 return (jbyteArray) JNIHandles::make_local(env, a);
1575 }
1576 }
1577 return NULL;
1578 JVM_END
1579
1580
1581 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1582 // some of this code was adapted from from jni_FromReflectedField
1583
1584 oop reflected = JNIHandles::resolve_non_null(field);
1585 oop mirror = java_lang_reflect_Field::clazz(reflected);
1586 Klass* k = java_lang_Class::as_Klass(mirror);
1587 int slot = java_lang_reflect_Field::slot(reflected);
1588 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1589
1590 InstanceKlass* ik = InstanceKlass::cast(k);
1591 intptr_t offset = ik->field_offset(slot);
1592
1593 if (modifiers & JVM_ACC_STATIC) {
1594 // for static fields we only look in the current class
1595 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1596 assert(false, "cannot find static field");
1597 return false;
1598 }
1599 } else {
1600 // for instance fields we start with the current class and work
1601 // our way up through the superclass chain
1602 if (!ik->find_field_from_offset(offset, false, &fd)) {
1603 assert(false, "cannot find instance field");
1604 return false;
1605 }
1606 }
1607 return true;
1608 }
1609
1610 static Method* jvm_get_method_common(jobject method) {
1611 // some of this code was adapted from from jni_FromReflectedMethod
1612
1613 oop reflected = JNIHandles::resolve_non_null(method);
1614 oop mirror = NULL;
1615 int slot = 0;
1616
1617 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1618 mirror = java_lang_reflect_Constructor::clazz(reflected);
1619 slot = java_lang_reflect_Constructor::slot(reflected);
1620 } else {
1621 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1622 "wrong type");
1623 mirror = java_lang_reflect_Method::clazz(reflected);
1624 slot = java_lang_reflect_Method::slot(reflected);
1625 }
1626 Klass* k = java_lang_Class::as_Klass(mirror);
1627
1628 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1629 assert(m != NULL, "cannot find method");
1630 return m; // caller has to deal with NULL in product mode
1631 }
1632
1633 /* Type use annotations support (JDK 1.8) */
1634
1635 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1636 assert (cls != NULL, "illegal class");
1637 JVMWrapper("JVM_GetClassTypeAnnotations");
1638 ResourceMark rm(THREAD);
1639 // Return null for arrays and primitives
1640 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1641 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1642 if (k->is_instance_klass()) {
1643 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1644 if (type_annotations != NULL) {
1645 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1646 return (jbyteArray) JNIHandles::make_local(env, a);
1647 }
1648 }
1649 }
1650 return NULL;
1651 JVM_END
1652
1653 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1654 assert (method != NULL, "illegal method");
1655 JVMWrapper("JVM_GetMethodTypeAnnotations");
1656
1657 // method is a handle to a java.lang.reflect.Method object
1658 Method* m = jvm_get_method_common(method);
1659 if (m == NULL) {
1660 return NULL;
1661 }
1662
1663 AnnotationArray* type_annotations = m->type_annotations();
1664 if (type_annotations != NULL) {
1665 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1666 return (jbyteArray) JNIHandles::make_local(env, a);
1667 }
1668
1669 return NULL;
1670 JVM_END
1671
1672 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1673 assert (field != NULL, "illegal field");
1674 JVMWrapper("JVM_GetFieldTypeAnnotations");
1675
1676 fieldDescriptor fd;
1677 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1678 if (!gotFd) {
1679 return NULL;
1680 }
1681
1682 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1683 JVM_END
1684
1685 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1686 if (!cp->is_within_bounds(index)) {
1687 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1688 }
1689 }
1690
1691 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1692 {
1693 JVMWrapper("JVM_GetMethodParameters");
1694 // method is a handle to a java.lang.reflect.Method object
1695 Method* method_ptr = jvm_get_method_common(method);
1696 methodHandle mh (THREAD, method_ptr);
1697 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1698 const int num_params = mh->method_parameters_length();
1699
1700 if (num_params < 0) {
1701 // A -1 return value from method_parameters_length means there is no
1702 // parameter data. Return null to indicate this to the reflection
1703 // API.
1704 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1705 return (jobjectArray)NULL;
1706 } else {
1707 // Otherwise, we return something up to reflection, even if it is
1708 // a zero-length array. Why? Because in some cases this can
1709 // trigger a MalformedParametersException.
1710
1711 // make sure all the symbols are properly formatted
1712 for (int i = 0; i < num_params; i++) {
1713 MethodParametersElement* params = mh->method_parameters_start();
1714 int index = params[i].name_cp_index;
1715 bounds_check(mh->constants(), index, CHECK_NULL);
1716
1717 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1718 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1719 "Wrong type at constant pool index");
1720 }
1721
1722 }
1723
1724 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1725 objArrayHandle result (THREAD, result_oop);
1726
1727 for (int i = 0; i < num_params; i++) {
1728 MethodParametersElement* params = mh->method_parameters_start();
1729 // For a 0 index, give a NULL symbol
1730 Symbol* sym = 0 != params[i].name_cp_index ?
1731 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1732 int flags = params[i].flags;
1733 oop param = Reflection::new_parameter(reflected_method, i, sym,
1734 flags, CHECK_NULL);
1735 result->obj_at_put(i, param);
1736 }
1737 return (jobjectArray)JNIHandles::make_local(env, result());
1738 }
1739 }
1740 JVM_END
1741
1742 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1743
1744 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1745 {
1746 JVMWrapper("JVM_GetClassDeclaredFields");
1747 JvmtiVMObjectAllocEventCollector oam;
1748
1749 // Exclude primitive types and array types
1750 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1751 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1752 // Return empty array
1753 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1754 return (jobjectArray) JNIHandles::make_local(env, res);
1755 }
1756
1757 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1758 constantPoolHandle cp(THREAD, k->constants());
1759
1760 // Ensure class is linked
1761 k->link_class(CHECK_NULL);
1762
1763 // Allocate result
1764 int num_fields;
1765
1766 if (publicOnly) {
1767 num_fields = 0;
1768 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1769 if (fs.access_flags().is_public()) ++num_fields;
1770 }
1771 } else {
1772 num_fields = k->java_fields_count();
1773 }
1774
1775 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1776 objArrayHandle result (THREAD, r);
1777
1778 int out_idx = 0;
1779 fieldDescriptor fd;
1780 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1781 if (!publicOnly || fs.access_flags().is_public()) {
1782 fd.reinitialize(k, fs.index());
1783 oop field = Reflection::new_field(&fd, CHECK_NULL);
1784 result->obj_at_put(out_idx, field);
1785 ++out_idx;
1786 }
1787 }
1788 assert(out_idx == num_fields, "just checking");
1789 return (jobjectArray) JNIHandles::make_local(env, result());
1790 }
1791 JVM_END
1792
1793 static bool select_method(methodHandle method, bool want_constructor) {
1794 if (want_constructor) {
1795 return (method->is_initializer() && !method->is_static());
1796 } else {
1797 return (!method->is_initializer() && !method->is_overpass());
1798 }
1799 }
1800
1801 static jobjectArray get_class_declared_methods_helper(
1802 JNIEnv *env,
1803 jclass ofClass, jboolean publicOnly,
1804 bool want_constructor,
1805 Klass* klass, TRAPS) {
1806
1807 JvmtiVMObjectAllocEventCollector oam;
1808
1809 // Exclude primitive types and array types
1810 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1811 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1812 // Return empty array
1813 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1814 return (jobjectArray) JNIHandles::make_local(env, res);
1815 }
1816
1817 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1818
1819 // Ensure class is linked
1820 k->link_class(CHECK_NULL);
1821
1822 Array<Method*>* methods = k->methods();
1823 int methods_length = methods->length();
1824
1825 // Save original method_idnum in case of redefinition, which can change
1826 // the idnum of obsolete methods. The new method will have the same idnum
1827 // but if we refresh the methods array, the counts will be wrong.
1828 ResourceMark rm(THREAD);
1829 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1830 int num_methods = 0;
1831
1832 for (int i = 0; i < methods_length; i++) {
1833 methodHandle method(THREAD, methods->at(i));
1834 if (select_method(method, want_constructor)) {
1835 if (!publicOnly || method->is_public()) {
1836 idnums->push(method->method_idnum());
1837 ++num_methods;
1838 }
1839 }
1840 }
1841
1842 // Allocate result
1843 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1844 objArrayHandle result (THREAD, r);
1845
1846 // Now just put the methods that we selected above, but go by their idnum
1847 // in case of redefinition. The methods can be redefined at any safepoint,
1848 // so above when allocating the oop array and below when creating reflect
1849 // objects.
1850 for (int i = 0; i < num_methods; i++) {
1851 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1852 if (method.is_null()) {
1853 // Method may have been deleted and seems this API can handle null
1854 // Otherwise should probably put a method that throws NSME
1855 result->obj_at_put(i, NULL);
1856 } else {
1857 oop m;
1858 if (want_constructor) {
1859 m = Reflection::new_constructor(method, CHECK_NULL);
1860 } else {
1861 m = Reflection::new_method(method, false, CHECK_NULL);
1862 }
1863 result->obj_at_put(i, m);
1864 }
1865 }
1866
1867 return (jobjectArray) JNIHandles::make_local(env, result());
1868 }
1869
1870 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1871 {
1872 JVMWrapper("JVM_GetClassDeclaredMethods");
1873 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1874 /*want_constructor*/ false,
1875 SystemDictionary::reflect_Method_klass(), THREAD);
1876 }
1877 JVM_END
1878
1879 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1880 {
1881 JVMWrapper("JVM_GetClassDeclaredConstructors");
1882 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1883 /*want_constructor*/ true,
1884 SystemDictionary::reflect_Constructor_klass(), THREAD);
1885 }
1886 JVM_END
1887
1888 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1889 {
1890 JVMWrapper("JVM_GetClassAccessFlags");
1891 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1892 // Primitive type
1893 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1894 }
1895
1896 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1897 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1898 }
1899 JVM_END
1900
1901
1902 // Constant pool access //////////////////////////////////////////////////////////
1903
1904 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1905 {
1906 JVMWrapper("JVM_GetClassConstantPool");
1907 JvmtiVMObjectAllocEventCollector oam;
1908
1909 // Return null for primitives and arrays
1910 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1911 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1912 if (k->is_instance_klass()) {
1913 InstanceKlass* k_h = InstanceKlass::cast(k);
1914 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1915 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1916 return JNIHandles::make_local(jcp());
1917 }
1918 }
1919 return NULL;
1920 }
1921 JVM_END
1922
1923
1924 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1925 {
1926 JVMWrapper("JVM_ConstantPoolGetSize");
1927 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1928 return cp->length();
1929 }
1930 JVM_END
1931
1932
1933 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1934 {
1935 JVMWrapper("JVM_ConstantPoolGetClassAt");
1936 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1937 bounds_check(cp, index, CHECK_NULL);
1938 constantTag tag = cp->tag_at(index);
1939 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1940 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1941 }
1942 Klass* k = cp->klass_at(index, CHECK_NULL);
1943 return (jclass) JNIHandles::make_local(k->java_mirror());
1944 }
1945 JVM_END
1946
1947 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1948 {
1949 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1950 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1951 bounds_check(cp, index, CHECK_NULL);
1952 constantTag tag = cp->tag_at(index);
1953 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1954 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1955 }
1956 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1957 if (k == NULL) return NULL;
1958 return (jclass) JNIHandles::make_local(k->java_mirror());
1959 }
1960 JVM_END
1961
1962 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1963 constantTag tag = cp->tag_at(index);
1964 if (!tag.is_method() && !tag.is_interface_method()) {
1965 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1966 }
1967 int klass_ref = cp->uncached_klass_ref_index_at(index);
1968 Klass* k_o;
1969 if (force_resolution) {
1970 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1971 } else {
1972 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1973 if (k_o == NULL) return NULL;
1974 }
1975 InstanceKlass* k = InstanceKlass::cast(k_o);
1976 Symbol* name = cp->uncached_name_ref_at(index);
1977 Symbol* sig = cp->uncached_signature_ref_at(index);
1978 methodHandle m (THREAD, k->find_method(name, sig));
1979 if (m.is_null()) {
1980 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1981 }
1982 oop method;
1983 if (!m->is_initializer() || m->is_static()) {
1984 method = Reflection::new_method(m, true, CHECK_NULL);
1985 } else {
1986 method = Reflection::new_constructor(m, CHECK_NULL);
1987 }
1988 return JNIHandles::make_local(method);
1989 }
1990
1991 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1992 {
1993 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1994 JvmtiVMObjectAllocEventCollector oam;
1995 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1996 bounds_check(cp, index, CHECK_NULL);
1997 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1998 return res;
1999 }
2000 JVM_END
2001
2002 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2003 {
2004 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2005 JvmtiVMObjectAllocEventCollector oam;
2006 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2007 bounds_check(cp, index, CHECK_NULL);
2008 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2009 return res;
2010 }
2011 JVM_END
2012
2013 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2014 constantTag tag = cp->tag_at(index);
2015 if (!tag.is_field()) {
2016 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2017 }
2018 int klass_ref = cp->uncached_klass_ref_index_at(index);
2019 Klass* k_o;
2020 if (force_resolution) {
2021 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2022 } else {
2023 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2024 if (k_o == NULL) return NULL;
2025 }
2026 InstanceKlass* k = InstanceKlass::cast(k_o);
2027 Symbol* name = cp->uncached_name_ref_at(index);
2028 Symbol* sig = cp->uncached_signature_ref_at(index);
2029 fieldDescriptor fd;
2030 Klass* target_klass = k->find_field(name, sig, &fd);
2031 if (target_klass == NULL) {
2032 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2033 }
2034 oop field = Reflection::new_field(&fd, CHECK_NULL);
2035 return JNIHandles::make_local(field);
2036 }
2037
2038 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2039 {
2040 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2041 JvmtiVMObjectAllocEventCollector oam;
2042 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2043 bounds_check(cp, index, CHECK_NULL);
2044 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2045 return res;
2046 }
2047 JVM_END
2048
2049 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2050 {
2051 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2052 JvmtiVMObjectAllocEventCollector oam;
2053 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2054 bounds_check(cp, index, CHECK_NULL);
2055 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2056 return res;
2057 }
2058 JVM_END
2059
2060 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2061 {
2062 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2063 JvmtiVMObjectAllocEventCollector oam;
2064 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2065 bounds_check(cp, index, CHECK_NULL);
2066 constantTag tag = cp->tag_at(index);
2067 if (!tag.is_field_or_method()) {
2068 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2069 }
2070 int klass_ref = cp->uncached_klass_ref_index_at(index);
2071 Symbol* klass_name = cp->klass_name_at(klass_ref);
2072 Symbol* member_name = cp->uncached_name_ref_at(index);
2073 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2074 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2075 objArrayHandle dest(THREAD, dest_o);
2076 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2077 dest->obj_at_put(0, str());
2078 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2079 dest->obj_at_put(1, str());
2080 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2081 dest->obj_at_put(2, str());
2082 return (jobjectArray) JNIHandles::make_local(dest());
2083 }
2084 JVM_END
2085
2086 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2087 {
2088 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2089 JvmtiVMObjectAllocEventCollector oam;
2090 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2091 bounds_check(cp, index, CHECK_0);
2092 constantTag tag = cp->tag_at(index);
2093 if (!tag.is_field_or_method()) {
2094 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2095 }
2096 return (jint) cp->uncached_klass_ref_index_at(index);
2097 }
2098 JVM_END
2099
2100 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2101 {
2102 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2103 JvmtiVMObjectAllocEventCollector oam;
2104 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2105 bounds_check(cp, index, CHECK_0);
2106 constantTag tag = cp->tag_at(index);
2107 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2108 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2109 }
2110 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2111 }
2112 JVM_END
2113
2114 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2115 {
2116 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2117 JvmtiVMObjectAllocEventCollector oam;
2118 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2119 bounds_check(cp, index, CHECK_NULL);
2120 constantTag tag = cp->tag_at(index);
2121 if (!tag.is_name_and_type()) {
2122 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2123 }
2124 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2125 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2126 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2127 objArrayHandle dest(THREAD, dest_o);
2128 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2129 dest->obj_at_put(0, str());
2130 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2131 dest->obj_at_put(1, str());
2132 return (jobjectArray) JNIHandles::make_local(dest());
2133 }
2134 JVM_END
2135
2136 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2137 {
2138 JVMWrapper("JVM_ConstantPoolGetIntAt");
2139 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2140 bounds_check(cp, index, CHECK_0);
2141 constantTag tag = cp->tag_at(index);
2142 if (!tag.is_int()) {
2143 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2144 }
2145 return cp->int_at(index);
2146 }
2147 JVM_END
2148
2149 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2150 {
2151 JVMWrapper("JVM_ConstantPoolGetLongAt");
2152 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2153 bounds_check(cp, index, CHECK_(0L));
2154 constantTag tag = cp->tag_at(index);
2155 if (!tag.is_long()) {
2156 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2157 }
2158 return cp->long_at(index);
2159 }
2160 JVM_END
2161
2162 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2163 {
2164 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2165 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2166 bounds_check(cp, index, CHECK_(0.0f));
2167 constantTag tag = cp->tag_at(index);
2168 if (!tag.is_float()) {
2169 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2170 }
2171 return cp->float_at(index);
2172 }
2173 JVM_END
2174
2175 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2176 {
2177 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2178 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2179 bounds_check(cp, index, CHECK_(0.0));
2180 constantTag tag = cp->tag_at(index);
2181 if (!tag.is_double()) {
2182 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2183 }
2184 return cp->double_at(index);
2185 }
2186 JVM_END
2187
2188 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2189 {
2190 JVMWrapper("JVM_ConstantPoolGetStringAt");
2191 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2192 bounds_check(cp, index, CHECK_NULL);
2193 constantTag tag = cp->tag_at(index);
2194 if (!tag.is_string()) {
2195 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2196 }
2197 oop str = cp->string_at(index, CHECK_NULL);
2198 return (jstring) JNIHandles::make_local(str);
2199 }
2200 JVM_END
2201
2202 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2203 {
2204 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2205 JvmtiVMObjectAllocEventCollector oam;
2206 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2207 bounds_check(cp, index, CHECK_NULL);
2208 constantTag tag = cp->tag_at(index);
2209 if (!tag.is_symbol()) {
2210 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2211 }
2212 Symbol* sym = cp->symbol_at(index);
2213 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2214 return (jstring) JNIHandles::make_local(str());
2215 }
2216 JVM_END
2217
2218 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2219 {
2220 JVMWrapper("JVM_ConstantPoolGetTagAt");
2221 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2222 bounds_check(cp, index, CHECK_0);
2223 constantTag tag = cp->tag_at(index);
2224 jbyte result = tag.value();
2225 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2226 // they are changed to the corresponding tags from the JVM spec, so that java code in
2227 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2228 if (tag.is_klass_or_reference()) {
2229 result = JVM_CONSTANT_Class;
2230 } else if (tag.is_string_index()) {
2231 result = JVM_CONSTANT_String;
2232 } else if (tag.is_method_type_in_error()) {
2233 result = JVM_CONSTANT_MethodType;
2234 } else if (tag.is_invoke_dynamic_in_error()) {
2235 result = JVM_CONSTANT_InvokeDynamic;
2236 } else if (tag.is_method_handle_in_error()) {
2237 result = JVM_CONSTANT_MethodHandle;
2238 }
2239 return result;
2240 }
2241 JVM_END
2242
2243 // Assertion support. //////////////////////////////////////////////////////////
2244
2245 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2246 JVMWrapper("JVM_DesiredAssertionStatus");
2247 assert(cls != NULL, "bad class");
2248
2249 oop r = JNIHandles::resolve(cls);
2250 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2251 if (java_lang_Class::is_primitive(r)) return false;
2252
2253 Klass* k = java_lang_Class::as_Klass(r);
2254 assert(k->is_instance_klass(), "must be an instance klass");
2255 if (!k->is_instance_klass()) return false;
2256
2257 ResourceMark rm(THREAD);
2258 const char* name = k->name()->as_C_string();
2259 bool system_class = k->class_loader() == NULL;
2260 return JavaAssertions::enabled(name, system_class);
2261
2262 JVM_END
2263
2264
2265 // Return a new AssertionStatusDirectives object with the fields filled in with
2266 // command-line assertion arguments (i.e., -ea, -da).
2267 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2268 JVMWrapper("JVM_AssertionStatusDirectives");
2269 JvmtiVMObjectAllocEventCollector oam;
2270 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2271 return JNIHandles::make_local(env, asd);
2272 JVM_END
2273
2274 // Verification ////////////////////////////////////////////////////////////////////////////////
2275
2276 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2277
2278 // RedefineClasses support: bug 6214132 caused verification to fail.
2279 // All functions from this section should call the jvmtiThreadSate function:
2280 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2281 // The function returns a Klass* of the _scratch_class if the verifier
2282 // was invoked in the middle of the class redefinition.
2283 // Otherwise it returns its argument value which is the _the_class Klass*.
2284 // Please, refer to the description in the jvmtiThreadSate.hpp.
2285
2286 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2287 JVMWrapper("JVM_GetClassNameUTF");
2288 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2289 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2290 return k->name()->as_utf8();
2291 JVM_END
2292
2293
2294 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2295 JVMWrapper("JVM_GetClassCPTypes");
2296 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2297 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2298 // types will have length zero if this is not an InstanceKlass
2299 // (length is determined by call to JVM_GetClassCPEntriesCount)
2300 if (k->is_instance_klass()) {
2301 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2302 for (int index = cp->length() - 1; index >= 0; index--) {
2303 constantTag tag = cp->tag_at(index);
2304 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2305 }
2306 }
2307 JVM_END
2308
2309
2310 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2311 JVMWrapper("JVM_GetClassCPEntriesCount");
2312 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2313 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2314 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2315 JVM_END
2316
2317
2318 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2319 JVMWrapper("JVM_GetClassFieldsCount");
2320 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2321 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2322 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2323 JVM_END
2324
2325
2326 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2327 JVMWrapper("JVM_GetClassMethodsCount");
2328 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2329 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2330 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2331 JVM_END
2332
2333
2334 // The following methods, used for the verifier, are never called with
2335 // array klasses, so a direct cast to InstanceKlass is safe.
2336 // Typically, these methods are called in a loop with bounds determined
2337 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2338 // zero for arrays.
2339 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2340 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2341 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2342 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2343 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2344 int length = method->checked_exceptions_length();
2345 if (length > 0) {
2346 CheckedExceptionElement* table= method->checked_exceptions_start();
2347 for (int i = 0; i < length; i++) {
2348 exceptions[i] = table[i].class_cp_index;
2349 }
2350 }
2351 JVM_END
2352
2353
2354 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2355 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2356 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2357 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2358 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2359 return method->checked_exceptions_length();
2360 JVM_END
2361
2362
2363 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2364 JVMWrapper("JVM_GetMethodIxByteCode");
2365 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2366 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2367 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2368 memcpy(code, method->code_base(), method->code_size());
2369 JVM_END
2370
2371
2372 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2373 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2374 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2375 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2376 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2377 return method->code_size();
2378 JVM_END
2379
2380
2381 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2382 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2383 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2384 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2385 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2386 ExceptionTable extable(method);
2387 entry->start_pc = extable.start_pc(entry_index);
2388 entry->end_pc = extable.end_pc(entry_index);
2389 entry->handler_pc = extable.handler_pc(entry_index);
2390 entry->catchType = extable.catch_type_index(entry_index);
2391 JVM_END
2392
2393
2394 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2395 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2396 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2397 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2398 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2399 return method->exception_table_length();
2400 JVM_END
2401
2402
2403 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2404 JVMWrapper("JVM_GetMethodIxModifiers");
2405 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2406 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2407 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2408 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2409 JVM_END
2410
2411
2412 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2413 JVMWrapper("JVM_GetFieldIxModifiers");
2414 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2415 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2416 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2417 JVM_END
2418
2419
2420 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2421 JVMWrapper("JVM_GetMethodIxLocalsCount");
2422 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2423 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2424 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2425 return method->max_locals();
2426 JVM_END
2427
2428
2429 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2430 JVMWrapper("JVM_GetMethodIxArgsSize");
2431 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2432 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2433 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2434 return method->size_of_parameters();
2435 JVM_END
2436
2437
2438 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2439 JVMWrapper("JVM_GetMethodIxMaxStack");
2440 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2441 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2442 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2443 return method->verifier_max_stack();
2444 JVM_END
2445
2446
2447 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2448 JVMWrapper("JVM_IsConstructorIx");
2449 ResourceMark rm(THREAD);
2450 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2451 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2452 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2453 return method->name() == vmSymbols::object_initializer_name();
2454 JVM_END
2455
2456
2457 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2458 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2459 ResourceMark rm(THREAD);
2460 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2461 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2462 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2463 return method->is_overpass();
2464 JVM_END
2465
2466 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2467 JVMWrapper("JVM_GetMethodIxIxUTF");
2468 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2469 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2470 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2471 return method->name()->as_utf8();
2472 JVM_END
2473
2474
2475 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2476 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2477 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2478 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2479 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2480 return method->signature()->as_utf8();
2481 JVM_END
2482
2483 /**
2484 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2485 * read entries in the constant pool. Since the old verifier always
2486 * works on a copy of the code, it will not see any rewriting that
2487 * may possibly occur in the middle of verification. So it is important
2488 * that nothing it calls tries to use the cpCache instead of the raw
2489 * constant pool, so we must use cp->uncached_x methods when appropriate.
2490 */
2491 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2492 JVMWrapper("JVM_GetCPFieldNameUTF");
2493 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2494 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2495 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2496 switch (cp->tag_at(cp_index).value()) {
2497 case JVM_CONSTANT_Fieldref:
2498 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2499 default:
2500 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2501 }
2502 ShouldNotReachHere();
2503 return NULL;
2504 JVM_END
2505
2506
2507 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2508 JVMWrapper("JVM_GetCPMethodNameUTF");
2509 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2510 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2511 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2512 switch (cp->tag_at(cp_index).value()) {
2513 case JVM_CONSTANT_InterfaceMethodref:
2514 case JVM_CONSTANT_Methodref:
2515 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2516 default:
2517 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2518 }
2519 ShouldNotReachHere();
2520 return NULL;
2521 JVM_END
2522
2523
2524 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2525 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2526 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2527 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2528 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2529 switch (cp->tag_at(cp_index).value()) {
2530 case JVM_CONSTANT_InterfaceMethodref:
2531 case JVM_CONSTANT_Methodref:
2532 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2533 default:
2534 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2535 }
2536 ShouldNotReachHere();
2537 return NULL;
2538 JVM_END
2539
2540
2541 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2542 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2544 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2545 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2546 switch (cp->tag_at(cp_index).value()) {
2547 case JVM_CONSTANT_Fieldref:
2548 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2549 default:
2550 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2551 }
2552 ShouldNotReachHere();
2553 return NULL;
2554 JVM_END
2555
2556
2557 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2558 JVMWrapper("JVM_GetCPClassNameUTF");
2559 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2560 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2561 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2562 Symbol* classname = cp->klass_name_at(cp_index);
2563 return classname->as_utf8();
2564 JVM_END
2565
2566
2567 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2568 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2569 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2570 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2571 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2572 switch (cp->tag_at(cp_index).value()) {
2573 case JVM_CONSTANT_Fieldref: {
2574 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2575 Symbol* classname = cp->klass_name_at(class_index);
2576 return classname->as_utf8();
2577 }
2578 default:
2579 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2580 }
2581 ShouldNotReachHere();
2582 return NULL;
2583 JVM_END
2584
2585
2586 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2587 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2588 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2589 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2590 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2591 switch (cp->tag_at(cp_index).value()) {
2592 case JVM_CONSTANT_Methodref:
2593 case JVM_CONSTANT_InterfaceMethodref: {
2594 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2595 Symbol* classname = cp->klass_name_at(class_index);
2596 return classname->as_utf8();
2597 }
2598 default:
2599 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2600 }
2601 ShouldNotReachHere();
2602 return NULL;
2603 JVM_END
2604
2605
2606 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2607 JVMWrapper("JVM_GetCPFieldModifiers");
2608 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2609 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2610 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2611 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2612 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2613 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2614 switch (cp->tag_at(cp_index).value()) {
2615 case JVM_CONSTANT_Fieldref: {
2616 Symbol* name = cp->uncached_name_ref_at(cp_index);
2617 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2618 InstanceKlass* ik = InstanceKlass::cast(k_called);
2619 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2620 if (fs.name() == name && fs.signature() == signature) {
2621 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2622 }
2623 }
2624 return -1;
2625 }
2626 default:
2627 fatal("JVM_GetCPFieldModifiers: illegal constant");
2628 }
2629 ShouldNotReachHere();
2630 return 0;
2631 JVM_END
2632
2633
2634 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2635 JVMWrapper("JVM_GetCPMethodModifiers");
2636 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2637 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2638 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2639 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2640 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2641 switch (cp->tag_at(cp_index).value()) {
2642 case JVM_CONSTANT_Methodref:
2643 case JVM_CONSTANT_InterfaceMethodref: {
2644 Symbol* name = cp->uncached_name_ref_at(cp_index);
2645 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2646 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2647 int methods_count = methods->length();
2648 for (int i = 0; i < methods_count; i++) {
2649 Method* method = methods->at(i);
2650 if (method->name() == name && method->signature() == signature) {
2651 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2652 }
2653 }
2654 return -1;
2655 }
2656 default:
2657 fatal("JVM_GetCPMethodModifiers: illegal constant");
2658 }
2659 ShouldNotReachHere();
2660 return 0;
2661 JVM_END
2662
2663
2664 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2665
2666 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2667 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2668 JVM_END
2669
2670
2671 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2672 JVMWrapper("JVM_IsSameClassPackage");
2673 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2674 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2675 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2676 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2677 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2678 JVM_END
2679
2680 // Printing support //////////////////////////////////////////////////
2681 extern "C" {
2682
2683 ATTRIBUTE_PRINTF(3, 0)
2684 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2685 // see bug 4399518, 4417214
2686 if ((intptr_t)count <= 0) return -1;
2687
2688 int result = vsnprintf(str, count, fmt, args);
2689 // Note: on truncation vsnprintf(3) on Unix returns numbers of
2690 // characters which would have been written had the buffer been large
2691 // enough; on Windows, it returns -1. We handle both cases here and
2692 // always return -1, and perform null termination.
2693 if ((result > 0 && (size_t)result >= count) || result == -1) {
2694 str[count - 1] = '\0';
2695 result = -1;
2696 }
2697
2698 return result;
2699 }
2700
2701 ATTRIBUTE_PRINTF(3, 0)
2702 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2703 va_list args;
2704 int len;
2705 va_start(args, fmt);
2706 len = jio_vsnprintf(str, count, fmt, args);
2707 va_end(args);
2708 return len;
2709 }
2710
2711 ATTRIBUTE_PRINTF(2,3)
2712 int jio_fprintf(FILE* f, const char *fmt, ...) {
2713 int len;
2714 va_list args;
2715 va_start(args, fmt);
2716 len = jio_vfprintf(f, fmt, args);
2717 va_end(args);
2718 return len;
2719 }
2720
2721 ATTRIBUTE_PRINTF(2, 0)
2722 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2723 if (Arguments::vfprintf_hook() != NULL) {
2724 return Arguments::vfprintf_hook()(f, fmt, args);
2725 } else {
2726 return vfprintf(f, fmt, args);
2727 }
2728 }
2729
2730 ATTRIBUTE_PRINTF(1, 2)
2731 JNIEXPORT int jio_printf(const char *fmt, ...) {
2732 int len;
2733 va_list args;
2734 va_start(args, fmt);
2735 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2736 va_end(args);
2737 return len;
2738 }
2739
2740
2741 // HotSpot specific jio method
2742 void jio_print(const char* s) {
2743 // Try to make this function as atomic as possible.
2744 if (Arguments::vfprintf_hook() != NULL) {
2745 jio_fprintf(defaultStream::output_stream(), "%s", s);
2746 } else {
2747 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2748 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2749 }
2750 }
2751
2752 } // Extern C
2753
2754 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2755
2756 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2757 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2758 // OSThread objects. The exception to this rule is when the target object is the thread
2759 // doing the operation, in which case we know that the thread won't exit until the
2760 // operation is done (all exits being voluntary). There are a few cases where it is
2761 // rather silly to do operations on yourself, like resuming yourself or asking whether
2762 // you are alive. While these can still happen, they are not subject to deadlocks if
2763 // the lock is held while the operation occurs (this is not the case for suspend, for
2764 // instance), and are very unlikely. Because IsAlive needs to be fast and its
2765 // implementation is local to this file, we always lock Threads_lock for that one.
2766
2767 static void thread_entry(JavaThread* thread, TRAPS) {
2768 HandleMark hm(THREAD);
2769 Handle obj(THREAD, thread->threadObj());
2770 JavaValue result(T_VOID);
2771 JavaCalls::call_virtual(&result,
2772 obj,
2773 SystemDictionary::Thread_klass(),
2774 vmSymbols::run_method_name(),
2775 vmSymbols::void_method_signature(),
2776 THREAD);
2777 }
2778
2779
2780 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2781 JVMWrapper("JVM_StartThread");
2782 JavaThread *native_thread = NULL;
2783
2784 // We cannot hold the Threads_lock when we throw an exception,
2785 // due to rank ordering issues. Example: we might need to grab the
2786 // Heap_lock while we construct the exception.
2787 bool throw_illegal_thread_state = false;
2788
2789 // We must release the Threads_lock before we can post a jvmti event
2790 // in Thread::start.
2791 {
2792 // Ensure that the C++ Thread and OSThread structures aren't freed before
2793 // we operate.
2794 MutexLocker mu(Threads_lock);
2795
2796 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2797 // re-starting an already started thread, so we should usually find
2798 // that the JavaThread is null. However for a JNI attached thread
2799 // there is a small window between the Thread object being created
2800 // (with its JavaThread set) and the update to its threadStatus, so we
2801 // have to check for this
2802 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2803 throw_illegal_thread_state = true;
2804 } else {
2805 // We could also check the stillborn flag to see if this thread was already stopped, but
2806 // for historical reasons we let the thread detect that itself when it starts running
2807
2808 jlong size =
2809 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2810 // Allocate the C++ Thread structure and create the native thread. The
2811 // stack size retrieved from java is 64-bit signed, but the constructor takes
2812 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2813 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2814 // - Avoid passing negative values which would result in really large stacks.
2815 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2816 size_t sz = size > 0 ? (size_t) size : 0;
2817 native_thread = new JavaThread(&thread_entry, sz);
2818
2819 // At this point it may be possible that no osthread was created for the
2820 // JavaThread due to lack of memory. Check for this situation and throw
2821 // an exception if necessary. Eventually we may want to change this so
2822 // that we only grab the lock if the thread was created successfully -
2823 // then we can also do this check and throw the exception in the
2824 // JavaThread constructor.
2825 if (native_thread->osthread() != NULL) {
2826 // Note: the current thread is not being used within "prepare".
2827 native_thread->prepare(jthread);
2828 }
2829 }
2830 }
2831
2832 if (throw_illegal_thread_state) {
2833 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2834 }
2835
2836 assert(native_thread != NULL, "Starting null thread?");
2837
2838 if (native_thread->osthread() == NULL) {
2839 // No one should hold a reference to the 'native_thread'.
2840 delete native_thread;
2841 if (JvmtiExport::should_post_resource_exhausted()) {
2842 JvmtiExport::post_resource_exhausted(
2843 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2844 os::native_thread_creation_failed_msg());
2845 }
2846 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2847 os::native_thread_creation_failed_msg());
2848 }
2849
2850 Thread::start(native_thread);
2851
2852 JVM_END
2853
2854 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2855 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2856 // but is thought to be reliable and simple. In the case, where the receiver is the
2857 // same thread as the sender, no safepoint is needed.
2858 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2859 JVMWrapper("JVM_StopThread");
2860
2861 oop java_throwable = JNIHandles::resolve(throwable);
2862 if (java_throwable == NULL) {
2863 THROW(vmSymbols::java_lang_NullPointerException());
2864 }
2865 oop java_thread = JNIHandles::resolve_non_null(jthread);
2866 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2867 Events::log_exception(JavaThread::current(),
2868 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2869 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2870 // First check if thread is alive
2871 if (receiver != NULL) {
2872 // Check if exception is getting thrown at self (use oop equality, since the
2873 // target object might exit)
2874 if (java_thread == thread->threadObj()) {
2875 THROW_OOP(java_throwable);
2876 } else {
2877 // Enques a VM_Operation to stop all threads and then deliver the exception...
2878 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2879 }
2880 }
2881 else {
2882 // Either:
2883 // - target thread has not been started before being stopped, or
2884 // - target thread already terminated
2885 // We could read the threadStatus to determine which case it is
2886 // but that is overkill as it doesn't matter. We must set the
2887 // stillborn flag for the first case, and if the thread has already
2888 // exited setting this flag has no affect
2889 java_lang_Thread::set_stillborn(java_thread);
2890 }
2891 JVM_END
2892
2893
2894 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2895 JVMWrapper("JVM_IsThreadAlive");
2896
2897 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2898 return java_lang_Thread::is_alive(thread_oop);
2899 JVM_END
2900
2901
2902 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2903 JVMWrapper("JVM_SuspendThread");
2904 oop java_thread = JNIHandles::resolve_non_null(jthread);
2905 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2906
2907 if (receiver != NULL) {
2908 // thread has run and has not exited (still on threads list)
2909
2910 {
2911 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2912 if (receiver->is_external_suspend()) {
2913 // Don't allow nested external suspend requests. We can't return
2914 // an error from this interface so just ignore the problem.
2915 return;
2916 }
2917 if (receiver->is_exiting()) { // thread is in the process of exiting
2918 return;
2919 }
2920 receiver->set_external_suspend();
2921 }
2922
2923 // java_suspend() will catch threads in the process of exiting
2924 // and will ignore them.
2925 receiver->java_suspend();
2926
2927 // It would be nice to have the following assertion in all the
2928 // time, but it is possible for a racing resume request to have
2929 // resumed this thread right after we suspended it. Temporarily
2930 // enable this assertion if you are chasing a different kind of
2931 // bug.
2932 //
2933 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2934 // receiver->is_being_ext_suspended(), "thread is not suspended");
2935 }
2936 JVM_END
2937
2938
2939 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2940 JVMWrapper("JVM_ResumeThread");
2941 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2942 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2943 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2944 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2945 // looks at it.
2946 MutexLocker ml(Threads_lock);
2947 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2948 if (thr != NULL) {
2949 // the thread has run and is not in the process of exiting
2950 thr->java_resume();
2951 }
2952 JVM_END
2953
2954
2955 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2956 JVMWrapper("JVM_SetThreadPriority");
2957 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2958 MutexLocker ml(Threads_lock);
2959 oop java_thread = JNIHandles::resolve_non_null(jthread);
2960 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2961 JavaThread* thr = java_lang_Thread::thread(java_thread);
2962 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
2963 Thread::set_priority(thr, (ThreadPriority)prio);
2964 }
2965 JVM_END
2966
2967
2968 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2969 JVMWrapper("JVM_Yield");
2970 if (os::dont_yield()) return;
2971 HOTSPOT_THREAD_YIELD();
2972 os::naked_yield();
2973 JVM_END
2974
2975
2976 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2977 JVMWrapper("JVM_Sleep");
2978
2979 if (millis < 0) {
2980 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2981 }
2982
2983 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2984 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2985 }
2986
2987 // Save current thread state and restore it at the end of this block.
2988 // And set new thread state to SLEEPING.
2989 JavaThreadSleepState jtss(thread);
2990
2991 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2992
2993 EventThreadSleep event;
2994
2995 if (millis == 0) {
2996 os::naked_yield();
2997 } else {
2998 ThreadState old_state = thread->osthread()->get_state();
2999 thread->osthread()->set_state(SLEEPING);
3000 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3001 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3002 // us while we were sleeping. We do not overwrite those.
3003 if (!HAS_PENDING_EXCEPTION) {
3004 if (event.should_commit()) {
3005 event.set_time(millis);
3006 event.commit();
3007 }
3008 HOTSPOT_THREAD_SLEEP_END(1);
3009
3010 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3011 // to properly restore the thread state. That's likely wrong.
3012 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3013 }
3014 }
3015 thread->osthread()->set_state(old_state);
3016 }
3017 if (event.should_commit()) {
3018 event.set_time(millis);
3019 event.commit();
3020 }
3021 HOTSPOT_THREAD_SLEEP_END(0);
3022 JVM_END
3023
3024 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3025 JVMWrapper("JVM_CurrentThread");
3026 oop jthread = thread->threadObj();
3027 assert (thread != NULL, "no current thread!");
3028 return JNIHandles::make_local(env, jthread);
3029 JVM_END
3030
3031
3032 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3033 JVMWrapper("JVM_CountStackFrames");
3034
3035 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3036 oop java_thread = JNIHandles::resolve_non_null(jthread);
3037 bool throw_illegal_thread_state = false;
3038 int count = 0;
3039
3040 {
3041 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3042 // We need to re-resolve the java_thread, since a GC might have happened during the
3043 // acquire of the lock
3044 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3045
3046 if (thr == NULL) {
3047 // do nothing
3048 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
3049 // Check whether this java thread has been suspended already. If not, throws
3050 // IllegalThreadStateException. We defer to throw that exception until
3051 // Threads_lock is released since loading exception class has to leave VM.
3052 // The correct way to test a thread is actually suspended is
3053 // wait_for_ext_suspend_completion(), but we can't call that while holding
3054 // the Threads_lock. The above tests are sufficient for our purposes
3055 // provided the walkability of the stack is stable - which it isn't
3056 // 100% but close enough for most practical purposes.
3057 throw_illegal_thread_state = true;
3058 } else {
3059 // Count all java activation, i.e., number of vframes
3060 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
3061 // Native frames are not counted
3062 if (!vfst.method()->is_native()) count++;
3063 }
3064 }
3065 }
3066
3067 if (throw_illegal_thread_state) {
3068 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3069 "this thread is not suspended");
3070 }
3071 return count;
3072 JVM_END
3073
3074 // Consider: A better way to implement JVM_Interrupt() is to acquire
3075 // Threads_lock to resolve the jthread into a Thread pointer, fetch
3076 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
3077 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
3078 // outside the critical section. Threads_lock is hot so we want to minimize
3079 // the hold-time. A cleaner interface would be to decompose interrupt into
3080 // two steps. The 1st phase, performed under Threads_lock, would return
3081 // a closure that'd be invoked after Threads_lock was dropped.
3082 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
3083 // admit spurious wakeups.
3084
3085 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3086 JVMWrapper("JVM_Interrupt");
3087
3088 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3089 oop java_thread = JNIHandles::resolve_non_null(jthread);
3090 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3091 // We need to re-resolve the java_thread, since a GC might have happened during the
3092 // acquire of the lock
3093 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3094 if (thr != NULL) {
3095 Thread::interrupt(thr);
3096 }
3097 JVM_END
3098
3099
3100 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3101 JVMWrapper("JVM_IsInterrupted");
3102
3103 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3104 oop java_thread = JNIHandles::resolve_non_null(jthread);
3105 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3106 // We need to re-resolve the java_thread, since a GC might have happened during the
3107 // acquire of the lock
3108 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3109 if (thr == NULL) {
3110 return JNI_FALSE;
3111 } else {
3112 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3113 }
3114 JVM_END
3115
3116
3117 // Return true iff the current thread has locked the object passed in
3118
3119 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3120 JVMWrapper("JVM_HoldsLock");
3121 assert(THREAD->is_Java_thread(), "sanity check");
3122 if (obj == NULL) {
3123 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3124 }
3125 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3126 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3127 JVM_END
3128
3129
3130 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3131 JVMWrapper("JVM_DumpAllStacks");
3132 VM_PrintThreads op;
3133 VMThread::execute(&op);
3134 if (JvmtiExport::should_post_data_dump()) {
3135 JvmtiExport::post_data_dump();
3136 }
3137 JVM_END
3138
3139 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3140 JVMWrapper("JVM_SetNativeThreadName");
3141 ResourceMark rm(THREAD);
3142 oop java_thread = JNIHandles::resolve_non_null(jthread);
3143 JavaThread* thr = java_lang_Thread::thread(java_thread);
3144 // Thread naming only supported for the current thread, doesn't work for
3145 // target threads.
3146 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3147 // we don't set the name of an attached thread to avoid stepping
3148 // on other programs
3149 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3150 os::set_native_thread_name(thread_name);
3151 }
3152 JVM_END
3153
3154 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3155
3156 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3157 assert(jthread->is_Java_thread(), "must be a Java thread");
3158 if (jthread->privileged_stack_top() == NULL) return false;
3159 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3160 oop loader = jthread->privileged_stack_top()->class_loader();
3161 if (loader == NULL) return true;
3162 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3163 if (trusted) return true;
3164 }
3165 return false;
3166 }
3167
3168 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3169 JVMWrapper("JVM_CurrentLoadedClass");
3170 ResourceMark rm(THREAD);
3171
3172 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3173 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3174 bool trusted = is_trusted_frame(thread, &vfst);
3175 if (trusted) return NULL;
3176
3177 Method* m = vfst.method();
3178 if (!m->is_native()) {
3179 InstanceKlass* holder = m->method_holder();
3180 oop loader = holder->class_loader();
3181 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3182 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3183 }
3184 }
3185 }
3186 return NULL;
3187 JVM_END
3188
3189
3190 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3191 JVMWrapper("JVM_CurrentClassLoader");
3192 ResourceMark rm(THREAD);
3193
3194 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3195
3196 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3197 bool trusted = is_trusted_frame(thread, &vfst);
3198 if (trusted) return NULL;
3199
3200 Method* m = vfst.method();
3201 if (!m->is_native()) {
3202 InstanceKlass* holder = m->method_holder();
3203 assert(holder->is_klass(), "just checking");
3204 oop loader = holder->class_loader();
3205 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3206 return JNIHandles::make_local(env, loader);
3207 }
3208 }
3209 }
3210 return NULL;
3211 JVM_END
3212
3213
3214 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3215 JVMWrapper("JVM_GetClassContext");
3216 ResourceMark rm(THREAD);
3217 JvmtiVMObjectAllocEventCollector oam;
3218 vframeStream vfst(thread);
3219
3220 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3221 // This must only be called from SecurityManager.getClassContext
3222 Method* m = vfst.method();
3223 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3224 m->name() == vmSymbols::getClassContext_name() &&
3225 m->signature() == vmSymbols::void_class_array_signature())) {
3226 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3227 }
3228 }
3229
3230 // Collect method holders
3231 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3232 for (; !vfst.at_end(); vfst.security_next()) {
3233 Method* m = vfst.method();
3234 // Native frames are not returned
3235 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3236 Klass* holder = m->method_holder();
3237 assert(holder->is_klass(), "just checking");
3238 klass_array->append(holder);
3239 }
3240 }
3241
3242 // Create result array of type [Ljava/lang/Class;
3243 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3244 // Fill in mirrors corresponding to method holders
3245 for (int i = 0; i < klass_array->length(); i++) {
3246 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3247 }
3248
3249 return (jobjectArray) JNIHandles::make_local(env, result);
3250 JVM_END
3251
3252
3253 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3254 JVMWrapper("JVM_ClassDepth");
3255 ResourceMark rm(THREAD);
3256 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3257 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3258
3259 const char* str = java_lang_String::as_utf8_string(class_name_str());
3260 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3261 if (class_name_sym == NULL) {
3262 return -1;
3263 }
3264
3265 int depth = 0;
3266
3267 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3268 if (!vfst.method()->is_native()) {
3269 InstanceKlass* holder = vfst.method()->method_holder();
3270 assert(holder->is_klass(), "just checking");
3271 if (holder->name() == class_name_sym) {
3272 return depth;
3273 }
3274 depth++;
3275 }
3276 }
3277 return -1;
3278 JVM_END
3279
3280
3281 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3282 JVMWrapper("JVM_ClassLoaderDepth");
3283 ResourceMark rm(THREAD);
3284 int depth = 0;
3285 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3286 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3287 bool trusted = is_trusted_frame(thread, &vfst);
3288 if (trusted) return -1;
3289
3290 Method* m = vfst.method();
3291 if (!m->is_native()) {
3292 InstanceKlass* holder = m->method_holder();
3293 assert(holder->is_klass(), "just checking");
3294 oop loader = holder->class_loader();
3295 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3296 return depth;
3297 }
3298 depth++;
3299 }
3300 }
3301 return -1;
3302 JVM_END
3303
3304
3305 // java.lang.Package ////////////////////////////////////////////////////////////////
3306
3307
3308 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3309 JVMWrapper("JVM_GetSystemPackage");
3310 ResourceMark rm(THREAD);
3311 JvmtiVMObjectAllocEventCollector oam;
3312 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3313 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3314 return (jstring) JNIHandles::make_local(result);
3315 JVM_END
3316
3317
3318 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3319 JVMWrapper("JVM_GetSystemPackages");
3320 JvmtiVMObjectAllocEventCollector oam;
3321 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3322 return (jobjectArray) JNIHandles::make_local(result);
3323 JVM_END
3324
3325
3326 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3327
3328
3329 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3330 JVMWrapper("JVM_GetAndClearReferencePendingList");
3331
3332 MonitorLockerEx ml(Heap_lock);
3333 oop ref = Universe::reference_pending_list();
3334 if (ref != NULL) {
3335 Universe::set_reference_pending_list(NULL);
3336 }
3337 return JNIHandles::make_local(env, ref);
3338 JVM_END
3339
3340 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3341 JVMWrapper("JVM_HasReferencePendingList");
3342 MonitorLockerEx ml(Heap_lock);
3343 return Universe::has_reference_pending_list();
3344 JVM_END
3345
3346 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3347 JVMWrapper("JVM_WaitForReferencePendingList");
3348 MonitorLockerEx ml(Heap_lock);
3349 while (!Universe::has_reference_pending_list()) {
3350 ml.wait();
3351 }
3352 JVM_END
3353
3354
3355 // ObjectInputStream ///////////////////////////////////////////////////////////////
3356
3357 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3358 if (current_class == NULL) {
3359 return true;
3360 }
3361 if ((current_class == field_class) || access.is_public()) {
3362 return true;
3363 }
3364
3365 if (access.is_protected()) {
3366 // See if current_class is a subclass of field_class
3367 if (current_class->is_subclass_of(field_class)) {
3368 return true;
3369 }
3370 }
3371
3372 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3373 }
3374
3375 // Return the first user-defined class loader up the execution stack, or null
3376 // if only code from the bootstrap or platform class loader is on the stack.
3377
3378 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3379 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3380 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3381 oop loader = vfst.method()->method_holder()->class_loader();
3382 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3383 return JNIHandles::make_local(env, loader);
3384 }
3385 }
3386 return NULL;
3387 JVM_END
3388
3389
3390 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3391
3392
3393 // resolve array handle and check arguments
3394 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3395 if (arr == NULL) {
3396 THROW_0(vmSymbols::java_lang_NullPointerException());
3397 }
3398 oop a = JNIHandles::resolve_non_null(arr);
3399 if (!a->is_array()) {
3400 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3401 } else if (type_array_only && !a->is_typeArray()) {
3402 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3403 }
3404 return arrayOop(a);
3405 }
3406
3407
3408 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3409 JVMWrapper("JVM_GetArrayLength");
3410 arrayOop a = check_array(env, arr, false, CHECK_0);
3411 return a->length();
3412 JVM_END
3413
3414
3415 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3416 JVMWrapper("JVM_Array_Get");
3417 JvmtiVMObjectAllocEventCollector oam;
3418 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3419 jvalue value;
3420 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3421 oop box = Reflection::box(&value, type, CHECK_NULL);
3422 return JNIHandles::make_local(env, box);
3423 JVM_END
3424
3425
3426 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3427 JVMWrapper("JVM_GetPrimitiveArrayElement");
3428 jvalue value;
3429 value.i = 0; // to initialize value before getting used in CHECK
3430 arrayOop a = check_array(env, arr, true, CHECK_(value));
3431 assert(a->is_typeArray(), "just checking");
3432 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3433 BasicType wide_type = (BasicType) wCode;
3434 if (type != wide_type) {
3435 Reflection::widen(&value, type, wide_type, CHECK_(value));
3436 }
3437 return value;
3438 JVM_END
3439
3440
3441 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3442 JVMWrapper("JVM_SetArrayElement");
3443 arrayOop a = check_array(env, arr, false, CHECK);
3444 oop box = JNIHandles::resolve(val);
3445 jvalue value;
3446 value.i = 0; // to initialize value before getting used in CHECK
3447 BasicType value_type;
3448 if (a->is_objArray()) {
3449 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3450 value_type = Reflection::unbox_for_regular_object(box, &value);
3451 } else {
3452 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3453 }
3454 Reflection::array_set(&value, a, index, value_type, CHECK);
3455 JVM_END
3456
3457
3458 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3459 JVMWrapper("JVM_SetPrimitiveArrayElement");
3460 arrayOop a = check_array(env, arr, true, CHECK);
3461 assert(a->is_typeArray(), "just checking");
3462 BasicType value_type = (BasicType) vCode;
3463 Reflection::array_set(&v, a, index, value_type, CHECK);
3464 JVM_END
3465
3466
3467 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3468 JVMWrapper("JVM_NewArray");
3469 JvmtiVMObjectAllocEventCollector oam;
3470 oop element_mirror = JNIHandles::resolve(eltClass);
3471 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3472 return JNIHandles::make_local(env, result);
3473 JVM_END
3474
3475
3476 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3477 JVMWrapper("JVM_NewMultiArray");
3478 JvmtiVMObjectAllocEventCollector oam;
3479 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3480 oop element_mirror = JNIHandles::resolve(eltClass);
3481 assert(dim_array->is_typeArray(), "just checking");
3482 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3483 return JNIHandles::make_local(env, result);
3484 JVM_END
3485
3486
3487 // Library support ///////////////////////////////////////////////////////////////////////////
3488
3489 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3490 //%note jvm_ct
3491 JVMWrapper("JVM_LoadLibrary");
3492 char ebuf[1024];
3493 void *load_result;
3494 {
3495 ThreadToNativeFromVM ttnfvm(thread);
3496 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3497 }
3498 if (load_result == NULL) {
3499 char msg[1024];
3500 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3501 // Since 'ebuf' may contain a string encoded using
3502 // platform encoding scheme, we need to pass
3503 // Exceptions::unsafe_to_utf8 to the new_exception method
3504 // as the last argument. See bug 6367357.
3505 Handle h_exception =
3506 Exceptions::new_exception(thread,
3507 vmSymbols::java_lang_UnsatisfiedLinkError(),
3508 msg, Exceptions::unsafe_to_utf8);
3509
3510 THROW_HANDLE_0(h_exception);
3511 }
3512 return load_result;
3513 JVM_END
3514
3515
3516 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3517 JVMWrapper("JVM_UnloadLibrary");
3518 os::dll_unload(handle);
3519 JVM_END
3520
3521
3522 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3523 JVMWrapper("JVM_FindLibraryEntry");
3524 return os::dll_lookup(handle, name);
3525 JVM_END
3526
3527
3528 // JNI version ///////////////////////////////////////////////////////////////////////////////
3529
3530 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3531 JVMWrapper("JVM_IsSupportedJNIVersion");
3532 return Threads::is_supported_jni_version_including_1_1(version);
3533 JVM_END
3534
3535
3536 // String support ///////////////////////////////////////////////////////////////////////////
3537
3538 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3539 JVMWrapper("JVM_InternString");
3540 JvmtiVMObjectAllocEventCollector oam;
3541 if (str == NULL) return NULL;
3542 oop string = JNIHandles::resolve_non_null(str);
3543 oop result = StringTable::intern(string, CHECK_NULL);
3544 return (jstring) JNIHandles::make_local(env, result);
3545 JVM_END
3546
3547
3548 // Raw monitor support //////////////////////////////////////////////////////////////////////
3549
3550 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3551 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3552 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3553 // that only works with java threads.
3554
3555
3556 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3557 VM_Exit::block_if_vm_exited();
3558 JVMWrapper("JVM_RawMonitorCreate");
3559 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3560 }
3561
3562
3563 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3564 VM_Exit::block_if_vm_exited();
3565 JVMWrapper("JVM_RawMonitorDestroy");
3566 delete ((Mutex*) mon);
3567 }
3568
3569
3570 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3571 VM_Exit::block_if_vm_exited();
3572 JVMWrapper("JVM_RawMonitorEnter");
3573 ((Mutex*) mon)->jvm_raw_lock();
3574 return 0;
3575 }
3576
3577
3578 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3579 VM_Exit::block_if_vm_exited();
3580 JVMWrapper("JVM_RawMonitorExit");
3581 ((Mutex*) mon)->jvm_raw_unlock();
3582 }
3583
3584
3585 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3586
3587 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3588 Handle loader, Handle protection_domain,
3589 jboolean throwError, TRAPS) {
3590 // Security Note:
3591 // The Java level wrapper will perform the necessary security check allowing
3592 // us to pass the NULL as the initiating class loader. The VM is responsible for
3593 // the checkPackageAccess relative to the initiating class loader via the
3594 // protection_domain. The protection_domain is passed as NULL by the java code
3595 // if there is no security manager in 3-arg Class.forName().
3596 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3597
3598 // Check if we should initialize the class
3599 if (init && klass->is_instance_klass()) {
3600 klass->initialize(CHECK_NULL);
3601 }
3602 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3603 }
3604
3605
3606 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3607
3608 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3609 JVMWrapper("JVM_InvokeMethod");
3610 Handle method_handle;
3611 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3612 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3613 Handle receiver(THREAD, JNIHandles::resolve(obj));
3614 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3615 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3616 jobject res = JNIHandles::make_local(env, result);
3617 if (JvmtiExport::should_post_vm_object_alloc()) {
3618 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3619 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3620 if (java_lang_Class::is_primitive(ret_type)) {
3621 // Only for primitive type vm allocates memory for java object.
3622 // See box() method.
3623 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3624 }
3625 }
3626 return res;
3627 } else {
3628 THROW_0(vmSymbols::java_lang_StackOverflowError());
3629 }
3630 JVM_END
3631
3632
3633 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3634 JVMWrapper("JVM_NewInstanceFromConstructor");
3635 oop constructor_mirror = JNIHandles::resolve(c);
3636 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3637 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3638 jobject res = JNIHandles::make_local(env, result);
3639 if (JvmtiExport::should_post_vm_object_alloc()) {
3640 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3641 }
3642 return res;
3643 JVM_END
3644
3645 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3646
3647 JVM_LEAF(jboolean, JVM_SupportsCX8())
3648 JVMWrapper("JVM_SupportsCX8");
3649 return VM_Version::supports_cx8();
3650 JVM_END
3651
3652 // Returns an array of all live Thread objects (VM internal JavaThreads,
3653 // jvmti agent threads, and JNI attaching threads are skipped)
3654 // See CR 6404306 regarding JNI attaching threads
3655 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3656 ResourceMark rm(THREAD);
3657 ThreadsListEnumerator tle(THREAD, false, false);
3658 JvmtiVMObjectAllocEventCollector oam;
3659
3660 int num_threads = tle.num_threads();
3661 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3662 objArrayHandle threads_ah(THREAD, r);
3663
3664 for (int i = 0; i < num_threads; i++) {
3665 Handle h = tle.get_threadObj(i);
3666 threads_ah->obj_at_put(i, h());
3667 }
3668
3669 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3670 JVM_END
3671
3672
3673 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3674 // Return StackTraceElement[][], each element is the stack trace of a thread in
3675 // the corresponding entry in the given threads array
3676 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3677 JVMWrapper("JVM_DumpThreads");
3678 JvmtiVMObjectAllocEventCollector oam;
3679
3680 // Check if threads is null
3681 if (threads == NULL) {
3682 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3683 }
3684
3685 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3686 objArrayHandle ah(THREAD, a);
3687 int num_threads = ah->length();
3688 // check if threads is non-empty array
3689 if (num_threads == 0) {
3690 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3691 }
3692
3693 // check if threads is not an array of objects of Thread class
3694 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3695 if (k != SystemDictionary::Thread_klass()) {
3696 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3697 }
3698
3699 ResourceMark rm(THREAD);
3700
3701 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3702 for (int i = 0; i < num_threads; i++) {
3703 oop thread_obj = ah->obj_at(i);
3704 instanceHandle h(THREAD, (instanceOop) thread_obj);
3705 thread_handle_array->append(h);
3706 }
3707
3708 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3709 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3710
3711 JVM_END
3712
3713 // JVM monitoring and management support
3714 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3715 return Management::get_jmm_interface(version);
3716 JVM_END
3717
3718 // com.sun.tools.attach.VirtualMachine agent properties support
3719 //
3720 // Initialize the agent properties with the properties maintained in the VM
3721 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3722 JVMWrapper("JVM_InitAgentProperties");
3723 ResourceMark rm;
3724
3725 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3726
3727 PUTPROP(props, "sun.java.command", Arguments::java_command());
3728 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3729 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3730 return properties;
3731 JVM_END
3732
3733 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3734 {
3735 JVMWrapper("JVM_GetEnclosingMethodInfo");
3736 JvmtiVMObjectAllocEventCollector oam;
3737
3738 if (ofClass == NULL) {
3739 return NULL;
3740 }
3741 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3742 // Special handling for primitive objects
3743 if (java_lang_Class::is_primitive(mirror())) {
3744 return NULL;
3745 }
3746 Klass* k = java_lang_Class::as_Klass(mirror());
3747 if (!k->is_instance_klass()) {
3748 return NULL;
3749 }
3750 InstanceKlass* ik = InstanceKlass::cast(k);
3751 int encl_method_class_idx = ik->enclosing_method_class_index();
3752 if (encl_method_class_idx == 0) {
3753 return NULL;
3754 }
3755 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3756 objArrayHandle dest(THREAD, dest_o);
3757 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3758 dest->obj_at_put(0, enc_k->java_mirror());
3759 int encl_method_method_idx = ik->enclosing_method_method_index();
3760 if (encl_method_method_idx != 0) {
3761 Symbol* sym = ik->constants()->symbol_at(
3762 extract_low_short_from_int(
3763 ik->constants()->name_and_type_at(encl_method_method_idx)));
3764 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3765 dest->obj_at_put(1, str());
3766 sym = ik->constants()->symbol_at(
3767 extract_high_short_from_int(
3768 ik->constants()->name_and_type_at(encl_method_method_idx)));
3769 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3770 dest->obj_at_put(2, str());
3771 }
3772 return (jobjectArray) JNIHandles::make_local(dest());
3773 }
3774 JVM_END
3775
3776 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3777 {
3778 memset(info, 0, info_size);
3779
3780 info->jvm_version = Abstract_VM_Version::jvm_version();
3781 info->patch_version = Abstract_VM_Version::vm_patch_version();
3782
3783 // when we add a new capability in the jvm_version_info struct, we should also
3784 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3785 // counter defined in runtimeService.cpp.
3786 info->is_attachable = AttachListener::is_attach_supported();
3787 }
3788 JVM_END
3789
3790 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3791 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3792 ResourceMark rm(THREAD);
3793
3794 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3795 return NULL;
3796 }
3797
3798 char** vm_flags = Arguments::jvm_flags_array();
3799 char** vm_args = Arguments::jvm_args_array();
3800 int num_flags = Arguments::num_jvm_flags();
3801 int num_args = Arguments::num_jvm_args();
3802
3803 InstanceKlass* ik = SystemDictionary::String_klass();
3804 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3805 objArrayHandle result_h(THREAD, r);
3806
3807 int index = 0;
3808 for (int j = 0; j < num_flags; j++, index++) {
3809 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3810 result_h->obj_at_put(index, h());
3811 }
3812 for (int i = 0; i < num_args; i++, index++) {
3813 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3814 result_h->obj_at_put(index, h());
3815 }
3816 return (jobjectArray) JNIHandles::make_local(env, result_h());
3817 JVM_END
3818
3819 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3820 return os::get_signal_number(name);
3821 JVM_END