1 /*
2 * Copyright (c) 1997, 2016, 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 KlassHandle(THREAD, 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 Handle 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 const KlassHandle klass (THREAD, 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 // Special handling for MemberNames. Since they contain Method* metadata, they
677 // must be registered so that RedefineClasses can fix metadata contained in them.
678 if (java_lang_invoke_MemberName::is_instance(new_obj()) &&
679 java_lang_invoke_MemberName::is_method(new_obj())) {
680 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj());
681 // MemberName may be unresolved, so doesn't need registration until resolved.
682 if (method != NULL) {
683 methodHandle m(THREAD, method);
684 // This can safepoint and redefine method, so need both new_obj and method
685 // in a handle, for two different reasons. new_obj can move, method can be
686 // deleted if nothing is using it on the stack.
687 m->method_holder()->add_member_name(new_obj());
688 }
689 }
690
691 // Caution: this involves a java upcall, so the clone should be
692 // "gc-robust" by this stage.
693 if (klass->has_finalizer()) {
694 assert(obj->is_instance(), "should be instanceOop");
695 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
696 new_obj = Handle(THREAD, new_obj_oop);
697 }
698
699 return JNIHandles::make_local(env, new_obj());
700 JVM_END
701
702 // java.io.File ///////////////////////////////////////////////////////////////
703
704 JVM_LEAF(char*, JVM_NativePath(char* path))
705 JVMWrapper("JVM_NativePath");
706 return os::native_path(path);
707 JVM_END
708
709
710 // Misc. class handling ///////////////////////////////////////////////////////////
711
712
713 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
714 JVMWrapper("JVM_GetCallerClass");
715
716 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
717 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
718 // temporarily for existing code to use until a replacement API is defined.
719 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
720 Klass* k = thread->security_get_caller_class(depth);
721 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
722 }
723
724 // Getting the class of the caller frame.
725 //
726 // The call stack at this point looks something like this:
727 //
728 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
729 // [1] [ @CallerSensitive API.method ]
730 // [.] [ (skipped intermediate frames) ]
731 // [n] [ caller ]
732 vframeStream vfst(thread);
733 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
734 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
735 Method* m = vfst.method();
736 assert(m != NULL, "sanity");
737 switch (n) {
738 case 0:
739 // This must only be called from Reflection.getCallerClass
740 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
741 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
742 }
743 // fall-through
744 case 1:
745 // Frame 0 and 1 must be caller sensitive.
746 if (!m->caller_sensitive()) {
747 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
748 }
749 break;
750 default:
751 if (!m->is_ignored_by_security_stack_walk()) {
752 // We have reached the desired frame; return the holder class.
753 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
754 }
755 break;
756 }
757 }
758 return NULL;
759 JVM_END
760
761
762 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
763 JVMWrapper("JVM_FindPrimitiveClass");
764 oop mirror = NULL;
765 BasicType t = name2type(utf);
766 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
767 mirror = Universe::java_mirror(t);
768 }
769 if (mirror == NULL) {
770 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
771 } else {
772 return (jclass) JNIHandles::make_local(env, mirror);
773 }
774 JVM_END
775
776
777 // Returns a class loaded by the bootstrap class loader; or null
778 // if not found. ClassNotFoundException is not thrown.
779 // FindClassFromBootLoader is exported to the launcher for windows.
780 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
781 const char* name))
782 JVMWrapper("JVM_FindClassFromBootLoader");
783
784 // Java libraries should ensure that name is never null...
785 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
786 // It's impossible to create this class; the name cannot fit
787 // into the constant pool.
788 return NULL;
789 }
790
791 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
792 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
793 if (k == NULL) {
794 return NULL;
795 }
796
797 if (log_is_enabled(Debug, class, resolve)) {
798 trace_class_resolution(k);
799 }
800 return (jclass) JNIHandles::make_local(env, k->java_mirror());
801 JVM_END
802
803 // Find a class with this name in this loader, using the caller's protection domain.
804 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
805 jboolean init, jobject loader,
806 jclass caller))
807 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
808 // Java libraries should ensure that name is never null...
809 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
810 // It's impossible to create this class; the name cannot fit
811 // into the constant pool.
812 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
813 }
814
815 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
816
817 oop loader_oop = JNIHandles::resolve(loader);
818 oop from_class = JNIHandles::resolve(caller);
819 oop protection_domain = NULL;
820 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
821 // NPE. Put it in another way, the bootstrap class loader has all permission and
822 // thus no checkPackageAccess equivalence in the VM class loader.
823 // The caller is also passed as NULL by the java code if there is no security
824 // manager to avoid the performance cost of getting the calling class.
825 if (from_class != NULL && loader_oop != NULL) {
826 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
827 }
828
829 Handle h_loader(THREAD, loader_oop);
830 Handle h_prot(THREAD, protection_domain);
831 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
832 h_prot, false, THREAD);
833
834 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
835 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
836 }
837 return result;
838 JVM_END
839
840 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
841 jboolean init, jclass from))
842 JVMWrapper("JVM_FindClassFromClass");
843 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
844 // It's impossible to create this class; the name cannot fit
845 // into the constant pool.
846 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
847 }
848 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
849 oop from_class_oop = JNIHandles::resolve(from);
850 Klass* from_class = (from_class_oop == NULL)
851 ? (Klass*)NULL
852 : java_lang_Class::as_Klass(from_class_oop);
853 oop class_loader = NULL;
854 oop protection_domain = NULL;
855 if (from_class != NULL) {
856 class_loader = from_class->class_loader();
857 protection_domain = from_class->protection_domain();
858 }
859 Handle h_loader(THREAD, class_loader);
860 Handle h_prot (THREAD, protection_domain);
861 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
862 h_prot, true, thread);
863
864 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
865 // this function is generally only used for class loading during verification.
866 ResourceMark rm;
867 oop from_mirror = JNIHandles::resolve_non_null(from);
868 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
869 const char * from_name = from_class->external_name();
870
871 oop mirror = JNIHandles::resolve_non_null(result);
872 Klass* to_class = java_lang_Class::as_Klass(mirror);
873 const char * to = to_class->external_name();
874 log_debug(class, resolve)("%s %s (verification)", from_name, to);
875 }
876
877 return result;
878 JVM_END
879
880 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
881 if (loader.is_null()) {
882 return;
883 }
884
885 // check whether the current caller thread holds the lock or not.
886 // If not, increment the corresponding counter
887 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
888 ObjectSynchronizer::owner_self) {
889 counter->inc();
890 }
891 }
892
893 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
894 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
895 jobject loader, const jbyte *buf,
896 jsize len, jobject pd, const char *source,
897 TRAPS) {
898 if (source == NULL) source = "__JVM_DefineClass__";
899
900 assert(THREAD->is_Java_thread(), "must be a JavaThread");
901 JavaThread* jt = (JavaThread*) THREAD;
902
903 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
904 ClassLoader::perf_define_appclass_selftime(),
905 ClassLoader::perf_define_appclasses(),
906 jt->get_thread_stat()->perf_recursion_counts_addr(),
907 jt->get_thread_stat()->perf_timers_addr(),
908 PerfClassTraceTime::DEFINE_CLASS);
909
910 if (UsePerfData) {
911 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
912 }
913
914 // Since exceptions can be thrown, class initialization can take place
915 // if name is NULL no check for class name in .class stream has to be made.
916 TempNewSymbol class_name = NULL;
917 if (name != NULL) {
918 const int str_len = (int)strlen(name);
919 if (str_len > Symbol::max_length()) {
920 // It's impossible to create this class; the name cannot fit
921 // into the constant pool.
922 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
923 }
924 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
925 }
926
927 ResourceMark rm(THREAD);
928 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
929 Handle class_loader (THREAD, JNIHandles::resolve(loader));
930 if (UsePerfData) {
931 is_lock_held_by_thread(class_loader,
932 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
933 THREAD);
934 }
935 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
936 Klass* k = SystemDictionary::resolve_from_stream(class_name,
937 class_loader,
938 protection_domain,
939 &st,
940 CHECK_NULL);
941
942 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
943 trace_class_resolution(k);
944 }
945
946 return (jclass) JNIHandles::make_local(env, k->java_mirror());
947 }
948
949
950 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
951 JVMWrapper("JVM_DefineClass");
952
953 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
954 JVM_END
955
956
957 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
958 JVMWrapper("JVM_DefineClassWithSource");
959
960 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
961 JVM_END
962
963 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
964 JVMWrapper("JVM_FindLoadedClass");
965 ResourceMark rm(THREAD);
966
967 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
968 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
969
970 const char* str = java_lang_String::as_utf8_string(string());
971 // Sanity check, don't expect null
972 if (str == NULL) return NULL;
973
974 const int str_len = (int)strlen(str);
975 if (str_len > Symbol::max_length()) {
976 // It's impossible to create this class; the name cannot fit
977 // into the constant pool.
978 return NULL;
979 }
980 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
981
982 // Security Note:
983 // The Java level wrapper will perform the necessary security check allowing
984 // us to pass the NULL as the initiating class loader.
985 Handle h_loader(THREAD, JNIHandles::resolve(loader));
986 if (UsePerfData) {
987 is_lock_held_by_thread(h_loader,
988 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
989 THREAD);
990 }
991
992 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
993 h_loader,
994 Handle(),
995 CHECK_NULL);
996 #if INCLUDE_CDS
997 if (k == NULL) {
998 // If the class is not already loaded, try to see if it's in the shared
999 // archive for the current classloader (h_loader).
1000 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
1001 klass_name, h_loader, CHECK_NULL);
1002 k = ik();
1003 }
1004 #endif
1005 return (k == NULL) ? NULL :
1006 (jclass) JNIHandles::make_local(env, k->java_mirror());
1007 JVM_END
1008
1009 // Module support //////////////////////////////////////////////////////////////////////////////
1010
1011 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1012 jstring location, const char* const* packages, jsize num_packages))
1013 JVMWrapper("JVM_DefineModule");
1014 Modules::define_module(module, version, location, packages, num_packages, CHECK);
1015 JVM_END
1016
1017 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1018 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1019 Modules::set_bootloader_unnamed_module(module, CHECK);
1020 JVM_END
1021
1022 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1023 JVMWrapper("JVM_AddModuleExports");
1024 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1025 JVM_END
1026
1027 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1028 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1029 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1030 JVM_END
1031
1032 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1033 JVMWrapper("JVM_AddModuleExportsToAll");
1034 Modules::add_module_exports(from_module, package, NULL, CHECK);
1035 JVM_END
1036
1037 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1038 JVMWrapper("JVM_AddReadsModule");
1039 Modules::add_reads_module(from_module, source_module, CHECK);
1040 JVM_END
1041
1042 JVM_ENTRY (void, JVM_AddModulePackage(JNIEnv *env, jobject module, const char* package))
1043 JVMWrapper("JVM_AddModulePackage");
1044 Modules::add_module_package(module, package, CHECK);
1045 JVM_END
1046
1047 JVM_ENTRY (jobject, JVM_GetModuleByPackageName(JNIEnv *env, jobject loader, const char* package))
1048 JVMWrapper("JVM_GetModuleByPackageName");
1049 return Modules::get_module_by_package_name(loader, package, THREAD);
1050 JVM_END
1051
1052 // Reflection support //////////////////////////////////////////////////////////////////////////////
1053
1054 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1055 assert (cls != NULL, "illegal class");
1056 JVMWrapper("JVM_GetClassName");
1057 JvmtiVMObjectAllocEventCollector oam;
1058 ResourceMark rm(THREAD);
1059 const char* name;
1060 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1061 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1062 } else {
1063 // Consider caching interned string in Klass
1064 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1065 assert(k->is_klass(), "just checking");
1066 name = k->external_name();
1067 }
1068 oop result = StringTable::intern((char*) name, CHECK_NULL);
1069 return (jstring) JNIHandles::make_local(env, result);
1070 JVM_END
1071
1072
1073 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1074 JVMWrapper("JVM_GetClassInterfaces");
1075 JvmtiVMObjectAllocEventCollector oam;
1076 oop mirror = JNIHandles::resolve_non_null(cls);
1077
1078 // Special handling for primitive objects
1079 if (java_lang_Class::is_primitive(mirror)) {
1080 // Primitive objects does not have any interfaces
1081 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1082 return (jobjectArray) JNIHandles::make_local(env, r);
1083 }
1084
1085 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
1086 // Figure size of result array
1087 int size;
1088 if (klass->is_instance_klass()) {
1089 size = InstanceKlass::cast(klass())->local_interfaces()->length();
1090 } else {
1091 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1092 size = 2;
1093 }
1094
1095 // Allocate result array
1096 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1097 objArrayHandle result (THREAD, r);
1098 // Fill in result
1099 if (klass->is_instance_klass()) {
1100 // Regular instance klass, fill in all local interfaces
1101 for (int index = 0; index < size; index++) {
1102 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
1103 result->obj_at_put(index, k->java_mirror());
1104 }
1105 } else {
1106 // All arrays implement java.lang.Cloneable and java.io.Serializable
1107 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1108 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1109 }
1110 return (jobjectArray) JNIHandles::make_local(env, result());
1111 JVM_END
1112
1113
1114 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1115 JVMWrapper("JVM_IsInterface");
1116 oop mirror = JNIHandles::resolve_non_null(cls);
1117 if (java_lang_Class::is_primitive(mirror)) {
1118 return JNI_FALSE;
1119 }
1120 Klass* k = java_lang_Class::as_Klass(mirror);
1121 jboolean result = k->is_interface();
1122 assert(!result || k->is_instance_klass(),
1123 "all interfaces are instance types");
1124 // The compiler intrinsic for isInterface tests the
1125 // Klass::_access_flags bits in the same way.
1126 return result;
1127 JVM_END
1128
1129
1130 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1131 JVMWrapper("JVM_GetClassSigners");
1132 JvmtiVMObjectAllocEventCollector oam;
1133 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1134 // There are no signers for primitive types
1135 return NULL;
1136 }
1137
1138 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1139
1140 // If there are no signers set in the class, or if the class
1141 // is an array, return NULL.
1142 if (signers == NULL) return NULL;
1143
1144 // copy of the signers array
1145 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1146 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1147 for (int index = 0; index < signers->length(); index++) {
1148 signers_copy->obj_at_put(index, signers->obj_at(index));
1149 }
1150
1151 // return the copy
1152 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1153 JVM_END
1154
1155
1156 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1157 JVMWrapper("JVM_SetClassSigners");
1158 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1159 // This call is ignored for primitive types and arrays.
1160 // Signers are only set once, ClassLoader.java, and thus shouldn't
1161 // be called with an array. Only the bootstrap loader creates arrays.
1162 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1163 if (k->is_instance_klass()) {
1164 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1165 }
1166 }
1167 JVM_END
1168
1169
1170 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1171 JVMWrapper("JVM_GetProtectionDomain");
1172 if (JNIHandles::resolve(cls) == NULL) {
1173 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1174 }
1175
1176 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1177 // Primitive types does not have a protection domain.
1178 return NULL;
1179 }
1180
1181 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1182 return (jobject) JNIHandles::make_local(env, pd);
1183 JVM_END
1184
1185
1186 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1187 // If there is a security manager and protection domain, check the access
1188 // in the protection domain, otherwise it is authorized.
1189 if (java_lang_System::has_security_manager()) {
1190
1191 // For bootstrapping, if pd implies method isn't in the JDK, allow
1192 // this context to revert to older behavior.
1193 // In this case the isAuthorized field in AccessControlContext is also not
1194 // present.
1195 if (Universe::protection_domain_implies_method() == NULL) {
1196 return true;
1197 }
1198
1199 // Whitelist certain access control contexts
1200 if (java_security_AccessControlContext::is_authorized(context)) {
1201 return true;
1202 }
1203
1204 oop prot = klass->protection_domain();
1205 if (prot != NULL) {
1206 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1207 // in the new wrapper.
1208 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1209 Handle h_prot(THREAD, prot);
1210 JavaValue result(T_BOOLEAN);
1211 JavaCallArguments args(h_prot);
1212 JavaCalls::call(&result, m, &args, CHECK_false);
1213 return (result.get_jboolean() != 0);
1214 }
1215 }
1216 return true;
1217 }
1218
1219 // Create an AccessControlContext with a protection domain with null codesource
1220 // and null permissions - which gives no permissions.
1221 oop create_dummy_access_control_context(TRAPS) {
1222 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1223 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1224 // Call constructor ProtectionDomain(null, null);
1225 JavaValue result(T_VOID);
1226 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1227 vmSymbols::object_initializer_name(),
1228 vmSymbols::codesource_permissioncollection_signature(),
1229 Handle(), Handle(), CHECK_NULL);
1230
1231 // new ProtectionDomain[] {pd};
1232 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1233 context->obj_at_put(0, obj());
1234
1235 // new AccessControlContext(new ProtectionDomain[] {pd})
1236 objArrayHandle h_context(THREAD, context);
1237 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1238 return acc;
1239 }
1240
1241 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1242 JVMWrapper("JVM_DoPrivileged");
1243
1244 if (action == NULL) {
1245 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1246 }
1247
1248 // Compute the frame initiating the do privileged operation and setup the privileged stack
1249 vframeStream vfst(thread);
1250 vfst.security_get_caller_frame(1);
1251
1252 if (vfst.at_end()) {
1253 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1254 }
1255
1256 Method* method = vfst.method();
1257 instanceKlassHandle klass (THREAD, method->method_holder());
1258
1259 // Check that action object understands "Object run()"
1260 Handle h_context;
1261 if (context != NULL) {
1262 h_context = Handle(THREAD, JNIHandles::resolve(context));
1263 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1264 if (!authorized) {
1265 // Create an unprivileged access control object and call it's run function
1266 // instead.
1267 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1268 h_context = Handle(THREAD, noprivs);
1269 }
1270 }
1271
1272 // Check that action object understands "Object run()"
1273 Handle object (THREAD, JNIHandles::resolve(action));
1274
1275 // get run() method
1276 Method* m_oop = object->klass()->uncached_lookup_method(
1277 vmSymbols::run_method_name(),
1278 vmSymbols::void_object_signature(),
1279 Klass::find_overpass);
1280 methodHandle m (THREAD, m_oop);
1281 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1282 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1283 }
1284
1285 // Stack allocated list of privileged stack elements
1286 PrivilegedElement pi;
1287 if (!vfst.at_end()) {
1288 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1289 thread->set_privileged_stack_top(&pi);
1290 }
1291
1292
1293 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1294 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1295 Handle pending_exception;
1296 JavaValue result(T_OBJECT);
1297 JavaCallArguments args(object);
1298 JavaCalls::call(&result, m, &args, THREAD);
1299
1300 // done with action, remove ourselves from the list
1301 if (!vfst.at_end()) {
1302 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1303 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1304 }
1305
1306 if (HAS_PENDING_EXCEPTION) {
1307 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1308 CLEAR_PENDING_EXCEPTION;
1309 // JVMTI has already reported the pending exception
1310 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1311 if (THREAD->is_Java_thread()) {
1312 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1313 }
1314 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1315 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1316 // Throw a java.security.PrivilegedActionException(Exception e) exception
1317 JavaCallArguments args(pending_exception);
1318 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1319 vmSymbols::exception_void_signature(),
1320 &args);
1321 }
1322 }
1323
1324 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1325 return JNIHandles::make_local(env, (oop) result.get_jobject());
1326 JVM_END
1327
1328
1329 // Returns the inherited_access_control_context field of the running thread.
1330 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1331 JVMWrapper("JVM_GetInheritedAccessControlContext");
1332 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1333 return JNIHandles::make_local(env, result);
1334 JVM_END
1335
1336 class RegisterArrayForGC {
1337 private:
1338 JavaThread *_thread;
1339 public:
1340 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1341 _thread = thread;
1342 _thread->register_array_for_gc(array);
1343 }
1344
1345 ~RegisterArrayForGC() {
1346 _thread->register_array_for_gc(NULL);
1347 }
1348 };
1349
1350
1351 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1352 JVMWrapper("JVM_GetStackAccessControlContext");
1353 if (!UsePrivilegedStack) return NULL;
1354
1355 ResourceMark rm(THREAD);
1356 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1357 JvmtiVMObjectAllocEventCollector oam;
1358
1359 // count the protection domains on the execution stack. We collapse
1360 // duplicate consecutive protection domains into a single one, as
1361 // well as stopping when we hit a privileged frame.
1362
1363 // Use vframeStream to iterate through Java frames
1364 vframeStream vfst(thread);
1365
1366 oop previous_protection_domain = NULL;
1367 Handle privileged_context(thread, NULL);
1368 bool is_privileged = false;
1369 oop protection_domain = NULL;
1370
1371 for(; !vfst.at_end(); vfst.next()) {
1372 // get method of frame
1373 Method* method = vfst.method();
1374 intptr_t* frame_id = vfst.frame_id();
1375
1376 // check the privileged frames to see if we have a match
1377 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1378 // this frame is privileged
1379 is_privileged = true;
1380 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1381 protection_domain = thread->privileged_stack_top()->protection_domain();
1382 } else {
1383 protection_domain = method->method_holder()->protection_domain();
1384 }
1385
1386 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1387 local_array->push(protection_domain);
1388 previous_protection_domain = protection_domain;
1389 }
1390
1391 if (is_privileged) break;
1392 }
1393
1394
1395 // either all the domains on the stack were system domains, or
1396 // we had a privileged system domain
1397 if (local_array->is_empty()) {
1398 if (is_privileged && privileged_context.is_null()) return NULL;
1399
1400 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1401 return JNIHandles::make_local(env, result);
1402 }
1403
1404 // the resource area must be registered in case of a gc
1405 RegisterArrayForGC ragc(thread, local_array);
1406 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1407 local_array->length(), CHECK_NULL);
1408 objArrayHandle h_context(thread, context);
1409 for (int index = 0; index < local_array->length(); index++) {
1410 h_context->obj_at_put(index, local_array->at(index));
1411 }
1412
1413 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1414
1415 return JNIHandles::make_local(env, result);
1416 JVM_END
1417
1418
1419 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1420 JVMWrapper("JVM_IsArrayClass");
1421 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1422 return (k != NULL) && k->is_array_klass() ? true : false;
1423 JVM_END
1424
1425
1426 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1427 JVMWrapper("JVM_IsPrimitiveClass");
1428 oop mirror = JNIHandles::resolve_non_null(cls);
1429 return (jboolean) java_lang_Class::is_primitive(mirror);
1430 JVM_END
1431
1432
1433 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1434 JVMWrapper("JVM_GetClassModifiers");
1435 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1436 // Primitive type
1437 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1438 }
1439
1440 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1441 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1442 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1443 return k->modifier_flags();
1444 JVM_END
1445
1446
1447 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1448
1449 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1450 JvmtiVMObjectAllocEventCollector oam;
1451 // ofClass is a reference to a java_lang_Class object. The mirror object
1452 // of an InstanceKlass
1453
1454 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1455 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1456 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1457 return (jobjectArray)JNIHandles::make_local(env, result);
1458 }
1459
1460 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1461 InnerClassesIterator iter(k);
1462
1463 if (iter.length() == 0) {
1464 // Neither an inner nor outer class
1465 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1466 return (jobjectArray)JNIHandles::make_local(env, result);
1467 }
1468
1469 // find inner class info
1470 constantPoolHandle cp(thread, k->constants());
1471 int length = iter.length();
1472
1473 // Allocate temp. result array
1474 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1475 objArrayHandle result (THREAD, r);
1476 int members = 0;
1477
1478 for (; !iter.done(); iter.next()) {
1479 int ioff = iter.inner_class_info_index();
1480 int ooff = iter.outer_class_info_index();
1481
1482 if (ioff != 0 && ooff != 0) {
1483 // Check to see if the name matches the class we're looking for
1484 // before attempting to find the class.
1485 if (cp->klass_name_at_matches(k, ooff)) {
1486 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1487 if (outer_klass == k()) {
1488 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1489 instanceKlassHandle inner_klass (THREAD, ik);
1490
1491 // Throws an exception if outer klass has not declared k as
1492 // an inner klass
1493 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1494
1495 result->obj_at_put(members, inner_klass->java_mirror());
1496 members++;
1497 }
1498 }
1499 }
1500 }
1501
1502 if (members != length) {
1503 // Return array of right length
1504 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1505 for(int i = 0; i < members; i++) {
1506 res->obj_at_put(i, result->obj_at(i));
1507 }
1508 return (jobjectArray)JNIHandles::make_local(env, res);
1509 }
1510
1511 return (jobjectArray)JNIHandles::make_local(env, result());
1512 JVM_END
1513
1514
1515 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1516 {
1517 // ofClass is a reference to a java_lang_Class object.
1518 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1519 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1520 return NULL;
1521 }
1522
1523 bool inner_is_member = false;
1524 Klass* outer_klass
1525 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1526 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1527 if (outer_klass == NULL) return NULL; // already a top-level class
1528 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1529 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1530 }
1531 JVM_END
1532
1533 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1534 {
1535 oop mirror = JNIHandles::resolve_non_null(cls);
1536 if (java_lang_Class::is_primitive(mirror) ||
1537 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1538 return NULL;
1539 }
1540 instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror)));
1541 int ooff = 0, noff = 0;
1542 if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) {
1543 if (noff != 0) {
1544 constantPoolHandle i_cp(thread, k->constants());
1545 Symbol* name = i_cp->symbol_at(noff);
1546 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1547 return (jstring) JNIHandles::make_local(env, str());
1548 }
1549 }
1550 return NULL;
1551 }
1552 JVM_END
1553
1554 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1555 assert (cls != NULL, "illegal class");
1556 JVMWrapper("JVM_GetClassSignature");
1557 JvmtiVMObjectAllocEventCollector oam;
1558 ResourceMark rm(THREAD);
1559 // Return null for arrays and primatives
1560 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1561 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1562 if (k->is_instance_klass()) {
1563 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1564 if (sym == NULL) return NULL;
1565 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1566 return (jstring) JNIHandles::make_local(env, str());
1567 }
1568 }
1569 return NULL;
1570 JVM_END
1571
1572
1573 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1574 assert (cls != NULL, "illegal class");
1575 JVMWrapper("JVM_GetClassAnnotations");
1576
1577 // Return null for arrays and primitives
1578 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1579 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1580 if (k->is_instance_klass()) {
1581 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1582 return (jbyteArray) JNIHandles::make_local(env, a);
1583 }
1584 }
1585 return NULL;
1586 JVM_END
1587
1588
1589 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1590 // some of this code was adapted from from jni_FromReflectedField
1591
1592 oop reflected = JNIHandles::resolve_non_null(field);
1593 oop mirror = java_lang_reflect_Field::clazz(reflected);
1594 Klass* k = java_lang_Class::as_Klass(mirror);
1595 int slot = java_lang_reflect_Field::slot(reflected);
1596 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1597
1598 KlassHandle kh(THREAD, k);
1599 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1600
1601 if (modifiers & JVM_ACC_STATIC) {
1602 // for static fields we only look in the current class
1603 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1604 assert(false, "cannot find static field");
1605 return false;
1606 }
1607 } else {
1608 // for instance fields we start with the current class and work
1609 // our way up through the superclass chain
1610 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1611 assert(false, "cannot find instance field");
1612 return false;
1613 }
1614 }
1615 return true;
1616 }
1617
1618 static Method* jvm_get_method_common(jobject method) {
1619 // some of this code was adapted from from jni_FromReflectedMethod
1620
1621 oop reflected = JNIHandles::resolve_non_null(method);
1622 oop mirror = NULL;
1623 int slot = 0;
1624
1625 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1626 mirror = java_lang_reflect_Constructor::clazz(reflected);
1627 slot = java_lang_reflect_Constructor::slot(reflected);
1628 } else {
1629 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1630 "wrong type");
1631 mirror = java_lang_reflect_Method::clazz(reflected);
1632 slot = java_lang_reflect_Method::slot(reflected);
1633 }
1634 Klass* k = java_lang_Class::as_Klass(mirror);
1635
1636 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1637 assert(m != NULL, "cannot find method");
1638 return m; // caller has to deal with NULL in product mode
1639 }
1640
1641 /* Type use annotations support (JDK 1.8) */
1642
1643 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1644 assert (cls != NULL, "illegal class");
1645 JVMWrapper("JVM_GetClassTypeAnnotations");
1646 ResourceMark rm(THREAD);
1647 // Return null for arrays and primitives
1648 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1649 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1650 if (k->is_instance_klass()) {
1651 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1652 if (type_annotations != NULL) {
1653 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1654 return (jbyteArray) JNIHandles::make_local(env, a);
1655 }
1656 }
1657 }
1658 return NULL;
1659 JVM_END
1660
1661 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1662 assert (method != NULL, "illegal method");
1663 JVMWrapper("JVM_GetMethodTypeAnnotations");
1664
1665 // method is a handle to a java.lang.reflect.Method object
1666 Method* m = jvm_get_method_common(method);
1667 if (m == NULL) {
1668 return NULL;
1669 }
1670
1671 AnnotationArray* type_annotations = m->type_annotations();
1672 if (type_annotations != NULL) {
1673 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1674 return (jbyteArray) JNIHandles::make_local(env, a);
1675 }
1676
1677 return NULL;
1678 JVM_END
1679
1680 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1681 assert (field != NULL, "illegal field");
1682 JVMWrapper("JVM_GetFieldTypeAnnotations");
1683
1684 fieldDescriptor fd;
1685 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1686 if (!gotFd) {
1687 return NULL;
1688 }
1689
1690 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1691 JVM_END
1692
1693 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1694 if (!cp->is_within_bounds(index)) {
1695 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1696 }
1697 }
1698
1699 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1700 {
1701 JVMWrapper("JVM_GetMethodParameters");
1702 // method is a handle to a java.lang.reflect.Method object
1703 Method* method_ptr = jvm_get_method_common(method);
1704 methodHandle mh (THREAD, method_ptr);
1705 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1706 const int num_params = mh->method_parameters_length();
1707
1708 if (num_params < 0) {
1709 // A -1 return value from method_parameters_length means there is no
1710 // parameter data. Return null to indicate this to the reflection
1711 // API.
1712 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1713 return (jobjectArray)NULL;
1714 } else {
1715 // Otherwise, we return something up to reflection, even if it is
1716 // a zero-length array. Why? Because in some cases this can
1717 // trigger a MalformedParametersException.
1718
1719 // make sure all the symbols are properly formatted
1720 for (int i = 0; i < num_params; i++) {
1721 MethodParametersElement* params = mh->method_parameters_start();
1722 int index = params[i].name_cp_index;
1723 bounds_check(mh->constants(), index, CHECK_NULL);
1724
1725 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1726 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1727 "Wrong type at constant pool index");
1728 }
1729
1730 }
1731
1732 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1733 objArrayHandle result (THREAD, result_oop);
1734
1735 for (int i = 0; i < num_params; i++) {
1736 MethodParametersElement* params = mh->method_parameters_start();
1737 // For a 0 index, give a NULL symbol
1738 Symbol* sym = 0 != params[i].name_cp_index ?
1739 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1740 int flags = params[i].flags;
1741 oop param = Reflection::new_parameter(reflected_method, i, sym,
1742 flags, CHECK_NULL);
1743 result->obj_at_put(i, param);
1744 }
1745 return (jobjectArray)JNIHandles::make_local(env, result());
1746 }
1747 }
1748 JVM_END
1749
1750 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1751
1752 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1753 {
1754 JVMWrapper("JVM_GetClassDeclaredFields");
1755 JvmtiVMObjectAllocEventCollector oam;
1756
1757 // Exclude primitive types and array types
1758 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1759 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1760 // Return empty array
1761 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1762 return (jobjectArray) JNIHandles::make_local(env, res);
1763 }
1764
1765 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1766 constantPoolHandle cp(THREAD, k->constants());
1767
1768 // Ensure class is linked
1769 k->link_class(CHECK_NULL);
1770
1771 // Allocate result
1772 int num_fields;
1773
1774 if (publicOnly) {
1775 num_fields = 0;
1776 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
1777 if (fs.access_flags().is_public()) ++num_fields;
1778 }
1779 } else {
1780 num_fields = k->java_fields_count();
1781 }
1782
1783 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1784 objArrayHandle result (THREAD, r);
1785
1786 int out_idx = 0;
1787 fieldDescriptor fd;
1788 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1789 if (!publicOnly || fs.access_flags().is_public()) {
1790 fd.reinitialize(k(), fs.index());
1791 oop field = Reflection::new_field(&fd, CHECK_NULL);
1792 result->obj_at_put(out_idx, field);
1793 ++out_idx;
1794 }
1795 }
1796 assert(out_idx == num_fields, "just checking");
1797 return (jobjectArray) JNIHandles::make_local(env, result());
1798 }
1799 JVM_END
1800
1801 static bool select_method(methodHandle method, bool want_constructor) {
1802 if (want_constructor) {
1803 return (method->is_initializer() && !method->is_static());
1804 } else {
1805 return (!method->is_initializer() && !method->is_overpass());
1806 }
1807 }
1808
1809 static jobjectArray get_class_declared_methods_helper(
1810 JNIEnv *env,
1811 jclass ofClass, jboolean publicOnly,
1812 bool want_constructor,
1813 Klass* klass, TRAPS) {
1814
1815 JvmtiVMObjectAllocEventCollector oam;
1816
1817 // Exclude primitive types and array types
1818 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1819 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1820 // Return empty array
1821 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1822 return (jobjectArray) JNIHandles::make_local(env, res);
1823 }
1824
1825 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1826
1827 // Ensure class is linked
1828 k->link_class(CHECK_NULL);
1829
1830 Array<Method*>* methods = k->methods();
1831 int methods_length = methods->length();
1832
1833 // Save original method_idnum in case of redefinition, which can change
1834 // the idnum of obsolete methods. The new method will have the same idnum
1835 // but if we refresh the methods array, the counts will be wrong.
1836 ResourceMark rm(THREAD);
1837 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1838 int num_methods = 0;
1839
1840 for (int i = 0; i < methods_length; i++) {
1841 methodHandle method(THREAD, methods->at(i));
1842 if (select_method(method, want_constructor)) {
1843 if (!publicOnly || method->is_public()) {
1844 idnums->push(method->method_idnum());
1845 ++num_methods;
1846 }
1847 }
1848 }
1849
1850 // Allocate result
1851 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1852 objArrayHandle result (THREAD, r);
1853
1854 // Now just put the methods that we selected above, but go by their idnum
1855 // in case of redefinition. The methods can be redefined at any safepoint,
1856 // so above when allocating the oop array and below when creating reflect
1857 // objects.
1858 for (int i = 0; i < num_methods; i++) {
1859 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1860 if (method.is_null()) {
1861 // Method may have been deleted and seems this API can handle null
1862 // Otherwise should probably put a method that throws NSME
1863 result->obj_at_put(i, NULL);
1864 } else {
1865 oop m;
1866 if (want_constructor) {
1867 m = Reflection::new_constructor(method, CHECK_NULL);
1868 } else {
1869 m = Reflection::new_method(method, false, CHECK_NULL);
1870 }
1871 result->obj_at_put(i, m);
1872 }
1873 }
1874
1875 return (jobjectArray) JNIHandles::make_local(env, result());
1876 }
1877
1878 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1879 {
1880 JVMWrapper("JVM_GetClassDeclaredMethods");
1881 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1882 /*want_constructor*/ false,
1883 SystemDictionary::reflect_Method_klass(), THREAD);
1884 }
1885 JVM_END
1886
1887 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1888 {
1889 JVMWrapper("JVM_GetClassDeclaredConstructors");
1890 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1891 /*want_constructor*/ true,
1892 SystemDictionary::reflect_Constructor_klass(), THREAD);
1893 }
1894 JVM_END
1895
1896 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1897 {
1898 JVMWrapper("JVM_GetClassAccessFlags");
1899 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1900 // Primitive type
1901 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1902 }
1903
1904 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1905 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1906 }
1907 JVM_END
1908
1909
1910 // Constant pool access //////////////////////////////////////////////////////////
1911
1912 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1913 {
1914 JVMWrapper("JVM_GetClassConstantPool");
1915 JvmtiVMObjectAllocEventCollector oam;
1916
1917 // Return null for primitives and arrays
1918 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1919 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1920 if (k->is_instance_klass()) {
1921 instanceKlassHandle k_h(THREAD, k);
1922 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1923 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1924 return JNIHandles::make_local(jcp());
1925 }
1926 }
1927 return NULL;
1928 }
1929 JVM_END
1930
1931
1932 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1933 {
1934 JVMWrapper("JVM_ConstantPoolGetSize");
1935 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1936 return cp->length();
1937 }
1938 JVM_END
1939
1940
1941 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1942 {
1943 JVMWrapper("JVM_ConstantPoolGetClassAt");
1944 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1945 bounds_check(cp, index, CHECK_NULL);
1946 constantTag tag = cp->tag_at(index);
1947 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1948 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1949 }
1950 Klass* k = cp->klass_at(index, CHECK_NULL);
1951 return (jclass) JNIHandles::make_local(k->java_mirror());
1952 }
1953 JVM_END
1954
1955 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1956 {
1957 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1958 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1959 bounds_check(cp, index, CHECK_NULL);
1960 constantTag tag = cp->tag_at(index);
1961 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1962 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1963 }
1964 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1965 if (k == NULL) return NULL;
1966 return (jclass) JNIHandles::make_local(k->java_mirror());
1967 }
1968 JVM_END
1969
1970 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1971 constantTag tag = cp->tag_at(index);
1972 if (!tag.is_method() && !tag.is_interface_method()) {
1973 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1974 }
1975 int klass_ref = cp->uncached_klass_ref_index_at(index);
1976 Klass* k_o;
1977 if (force_resolution) {
1978 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1979 } else {
1980 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1981 if (k_o == NULL) return NULL;
1982 }
1983 instanceKlassHandle k(THREAD, k_o);
1984 Symbol* name = cp->uncached_name_ref_at(index);
1985 Symbol* sig = cp->uncached_signature_ref_at(index);
1986 methodHandle m (THREAD, k->find_method(name, sig));
1987 if (m.is_null()) {
1988 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1989 }
1990 oop method;
1991 if (!m->is_initializer() || m->is_static()) {
1992 method = Reflection::new_method(m, true, CHECK_NULL);
1993 } else {
1994 method = Reflection::new_constructor(m, CHECK_NULL);
1995 }
1996 return JNIHandles::make_local(method);
1997 }
1998
1999 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2000 {
2001 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2002 JvmtiVMObjectAllocEventCollector oam;
2003 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2004 bounds_check(cp, index, CHECK_NULL);
2005 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2006 return res;
2007 }
2008 JVM_END
2009
2010 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2011 {
2012 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2013 JvmtiVMObjectAllocEventCollector oam;
2014 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2015 bounds_check(cp, index, CHECK_NULL);
2016 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2017 return res;
2018 }
2019 JVM_END
2020
2021 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2022 constantTag tag = cp->tag_at(index);
2023 if (!tag.is_field()) {
2024 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2025 }
2026 int klass_ref = cp->uncached_klass_ref_index_at(index);
2027 Klass* k_o;
2028 if (force_resolution) {
2029 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2030 } else {
2031 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2032 if (k_o == NULL) return NULL;
2033 }
2034 instanceKlassHandle k(THREAD, k_o);
2035 Symbol* name = cp->uncached_name_ref_at(index);
2036 Symbol* sig = cp->uncached_signature_ref_at(index);
2037 fieldDescriptor fd;
2038 Klass* target_klass = k->find_field(name, sig, &fd);
2039 if (target_klass == NULL) {
2040 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2041 }
2042 oop field = Reflection::new_field(&fd, CHECK_NULL);
2043 return JNIHandles::make_local(field);
2044 }
2045
2046 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2047 {
2048 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2049 JvmtiVMObjectAllocEventCollector oam;
2050 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2051 bounds_check(cp, index, CHECK_NULL);
2052 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2053 return res;
2054 }
2055 JVM_END
2056
2057 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2058 {
2059 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2060 JvmtiVMObjectAllocEventCollector oam;
2061 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2062 bounds_check(cp, index, CHECK_NULL);
2063 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2064 return res;
2065 }
2066 JVM_END
2067
2068 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2069 {
2070 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2071 JvmtiVMObjectAllocEventCollector oam;
2072 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2073 bounds_check(cp, index, CHECK_NULL);
2074 constantTag tag = cp->tag_at(index);
2075 if (!tag.is_field_or_method()) {
2076 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2077 }
2078 int klass_ref = cp->uncached_klass_ref_index_at(index);
2079 Symbol* klass_name = cp->klass_name_at(klass_ref);
2080 Symbol* member_name = cp->uncached_name_ref_at(index);
2081 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2082 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2083 objArrayHandle dest(THREAD, dest_o);
2084 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2085 dest->obj_at_put(0, str());
2086 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2087 dest->obj_at_put(1, str());
2088 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2089 dest->obj_at_put(2, str());
2090 return (jobjectArray) JNIHandles::make_local(dest());
2091 }
2092 JVM_END
2093
2094 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2095 {
2096 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2097 JvmtiVMObjectAllocEventCollector oam;
2098 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2099 bounds_check(cp, index, CHECK_0);
2100 constantTag tag = cp->tag_at(index);
2101 if (!tag.is_field_or_method()) {
2102 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2103 }
2104 return (jint) cp->uncached_klass_ref_index_at(index);
2105 }
2106 JVM_END
2107
2108 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2109 {
2110 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2111 JvmtiVMObjectAllocEventCollector oam;
2112 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2113 bounds_check(cp, index, CHECK_0);
2114 constantTag tag = cp->tag_at(index);
2115 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2116 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2117 }
2118 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2119 }
2120 JVM_END
2121
2122 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2123 {
2124 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2125 JvmtiVMObjectAllocEventCollector oam;
2126 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2127 bounds_check(cp, index, CHECK_NULL);
2128 constantTag tag = cp->tag_at(index);
2129 if (!tag.is_name_and_type()) {
2130 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2131 }
2132 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2133 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2134 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2135 objArrayHandle dest(THREAD, dest_o);
2136 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2137 dest->obj_at_put(0, str());
2138 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2139 dest->obj_at_put(1, str());
2140 return (jobjectArray) JNIHandles::make_local(dest());
2141 }
2142 JVM_END
2143
2144 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2145 {
2146 JVMWrapper("JVM_ConstantPoolGetIntAt");
2147 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2148 bounds_check(cp, index, CHECK_0);
2149 constantTag tag = cp->tag_at(index);
2150 if (!tag.is_int()) {
2151 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2152 }
2153 return cp->int_at(index);
2154 }
2155 JVM_END
2156
2157 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2158 {
2159 JVMWrapper("JVM_ConstantPoolGetLongAt");
2160 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2161 bounds_check(cp, index, CHECK_(0L));
2162 constantTag tag = cp->tag_at(index);
2163 if (!tag.is_long()) {
2164 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2165 }
2166 return cp->long_at(index);
2167 }
2168 JVM_END
2169
2170 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2171 {
2172 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2173 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2174 bounds_check(cp, index, CHECK_(0.0f));
2175 constantTag tag = cp->tag_at(index);
2176 if (!tag.is_float()) {
2177 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2178 }
2179 return cp->float_at(index);
2180 }
2181 JVM_END
2182
2183 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2184 {
2185 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2186 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2187 bounds_check(cp, index, CHECK_(0.0));
2188 constantTag tag = cp->tag_at(index);
2189 if (!tag.is_double()) {
2190 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2191 }
2192 return cp->double_at(index);
2193 }
2194 JVM_END
2195
2196 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2197 {
2198 JVMWrapper("JVM_ConstantPoolGetStringAt");
2199 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2200 bounds_check(cp, index, CHECK_NULL);
2201 constantTag tag = cp->tag_at(index);
2202 if (!tag.is_string()) {
2203 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2204 }
2205 oop str = cp->string_at(index, CHECK_NULL);
2206 return (jstring) JNIHandles::make_local(str);
2207 }
2208 JVM_END
2209
2210 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2211 {
2212 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2213 JvmtiVMObjectAllocEventCollector oam;
2214 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2215 bounds_check(cp, index, CHECK_NULL);
2216 constantTag tag = cp->tag_at(index);
2217 if (!tag.is_symbol()) {
2218 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2219 }
2220 Symbol* sym = cp->symbol_at(index);
2221 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2222 return (jstring) JNIHandles::make_local(str());
2223 }
2224 JVM_END
2225
2226 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2227 {
2228 JVMWrapper("JVM_ConstantPoolGetTagAt");
2229 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2230 bounds_check(cp, index, CHECK_0);
2231 constantTag tag = cp->tag_at(index);
2232 jbyte result = tag.value();
2233 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2234 // they are changed to the corresponding tags from the JVM spec, so that java code in
2235 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2236 if (tag.is_klass_or_reference()) {
2237 result = JVM_CONSTANT_Class;
2238 } else if (tag.is_string_index()) {
2239 result = JVM_CONSTANT_String;
2240 } else if (tag.is_method_type_in_error()) {
2241 result = JVM_CONSTANT_MethodType;
2242 } else if (tag.is_method_handle_in_error()) {
2243 result = JVM_CONSTANT_MethodHandle;
2244 }
2245 return result;
2246 }
2247 JVM_END
2248
2249 // Assertion support. //////////////////////////////////////////////////////////
2250
2251 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2252 JVMWrapper("JVM_DesiredAssertionStatus");
2253 assert(cls != NULL, "bad class");
2254
2255 oop r = JNIHandles::resolve(cls);
2256 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2257 if (java_lang_Class::is_primitive(r)) return false;
2258
2259 Klass* k = java_lang_Class::as_Klass(r);
2260 assert(k->is_instance_klass(), "must be an instance klass");
2261 if (!k->is_instance_klass()) return false;
2262
2263 ResourceMark rm(THREAD);
2264 const char* name = k->name()->as_C_string();
2265 bool system_class = k->class_loader() == NULL;
2266 return JavaAssertions::enabled(name, system_class);
2267
2268 JVM_END
2269
2270
2271 // Return a new AssertionStatusDirectives object with the fields filled in with
2272 // command-line assertion arguments (i.e., -ea, -da).
2273 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2274 JVMWrapper("JVM_AssertionStatusDirectives");
2275 JvmtiVMObjectAllocEventCollector oam;
2276 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2277 return JNIHandles::make_local(env, asd);
2278 JVM_END
2279
2280 // Verification ////////////////////////////////////////////////////////////////////////////////
2281
2282 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2283
2284 // RedefineClasses support: bug 6214132 caused verification to fail.
2285 // All functions from this section should call the jvmtiThreadSate function:
2286 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2287 // The function returns a Klass* of the _scratch_class if the verifier
2288 // was invoked in the middle of the class redefinition.
2289 // Otherwise it returns its argument value which is the _the_class Klass*.
2290 // Please, refer to the description in the jvmtiThreadSate.hpp.
2291
2292 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2293 JVMWrapper("JVM_GetClassNameUTF");
2294 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2295 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2296 return k->name()->as_utf8();
2297 JVM_END
2298
2299
2300 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2301 JVMWrapper("JVM_GetClassCPTypes");
2302 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2303 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2304 // types will have length zero if this is not an InstanceKlass
2305 // (length is determined by call to JVM_GetClassCPEntriesCount)
2306 if (k->is_instance_klass()) {
2307 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2308 for (int index = cp->length() - 1; index >= 0; index--) {
2309 constantTag tag = cp->tag_at(index);
2310 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2311 }
2312 }
2313 JVM_END
2314
2315
2316 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2317 JVMWrapper("JVM_GetClassCPEntriesCount");
2318 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2319 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2320 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2321 JVM_END
2322
2323
2324 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2325 JVMWrapper("JVM_GetClassFieldsCount");
2326 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2327 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2328 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2329 JVM_END
2330
2331
2332 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2333 JVMWrapper("JVM_GetClassMethodsCount");
2334 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2335 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2336 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2337 JVM_END
2338
2339
2340 // The following methods, used for the verifier, are never called with
2341 // array klasses, so a direct cast to InstanceKlass is safe.
2342 // Typically, these methods are called in a loop with bounds determined
2343 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2344 // zero for arrays.
2345 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2346 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2347 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2348 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2349 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2350 int length = method->checked_exceptions_length();
2351 if (length > 0) {
2352 CheckedExceptionElement* table= method->checked_exceptions_start();
2353 for (int i = 0; i < length; i++) {
2354 exceptions[i] = table[i].class_cp_index;
2355 }
2356 }
2357 JVM_END
2358
2359
2360 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2361 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2362 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2363 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2364 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2365 return method->checked_exceptions_length();
2366 JVM_END
2367
2368
2369 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2370 JVMWrapper("JVM_GetMethodIxByteCode");
2371 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2372 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2373 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2374 memcpy(code, method->code_base(), method->code_size());
2375 JVM_END
2376
2377
2378 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2379 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2380 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2381 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2382 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2383 return method->code_size();
2384 JVM_END
2385
2386
2387 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2388 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2389 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2390 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2391 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2392 ExceptionTable extable(method);
2393 entry->start_pc = extable.start_pc(entry_index);
2394 entry->end_pc = extable.end_pc(entry_index);
2395 entry->handler_pc = extable.handler_pc(entry_index);
2396 entry->catchType = extable.catch_type_index(entry_index);
2397 JVM_END
2398
2399
2400 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2401 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2402 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2403 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2404 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2405 return method->exception_table_length();
2406 JVM_END
2407
2408
2409 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2410 JVMWrapper("JVM_GetMethodIxModifiers");
2411 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2412 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2413 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2414 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2415 JVM_END
2416
2417
2418 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2419 JVMWrapper("JVM_GetFieldIxModifiers");
2420 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2421 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2422 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2423 JVM_END
2424
2425
2426 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2427 JVMWrapper("JVM_GetMethodIxLocalsCount");
2428 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2429 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2430 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2431 return method->max_locals();
2432 JVM_END
2433
2434
2435 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2436 JVMWrapper("JVM_GetMethodIxArgsSize");
2437 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2438 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2439 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2440 return method->size_of_parameters();
2441 JVM_END
2442
2443
2444 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2445 JVMWrapper("JVM_GetMethodIxMaxStack");
2446 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2447 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2448 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2449 return method->verifier_max_stack();
2450 JVM_END
2451
2452
2453 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2454 JVMWrapper("JVM_IsConstructorIx");
2455 ResourceMark rm(THREAD);
2456 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2457 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2458 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2459 return method->name() == vmSymbols::object_initializer_name();
2460 JVM_END
2461
2462
2463 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2464 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2465 ResourceMark rm(THREAD);
2466 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2467 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2468 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2469 return method->is_overpass();
2470 JVM_END
2471
2472 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2473 JVMWrapper("JVM_GetMethodIxIxUTF");
2474 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2475 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2476 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2477 return method->name()->as_utf8();
2478 JVM_END
2479
2480
2481 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2482 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2483 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2484 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2485 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2486 return method->signature()->as_utf8();
2487 JVM_END
2488
2489 /**
2490 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2491 * read entries in the constant pool. Since the old verifier always
2492 * works on a copy of the code, it will not see any rewriting that
2493 * may possibly occur in the middle of verification. So it is important
2494 * that nothing it calls tries to use the cpCache instead of the raw
2495 * constant pool, so we must use cp->uncached_x methods when appropriate.
2496 */
2497 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2498 JVMWrapper("JVM_GetCPFieldNameUTF");
2499 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2500 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2501 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2502 switch (cp->tag_at(cp_index).value()) {
2503 case JVM_CONSTANT_Fieldref:
2504 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2505 default:
2506 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2507 }
2508 ShouldNotReachHere();
2509 return NULL;
2510 JVM_END
2511
2512
2513 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2514 JVMWrapper("JVM_GetCPMethodNameUTF");
2515 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2516 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2517 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2518 switch (cp->tag_at(cp_index).value()) {
2519 case JVM_CONSTANT_InterfaceMethodref:
2520 case JVM_CONSTANT_Methodref:
2521 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2522 default:
2523 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2524 }
2525 ShouldNotReachHere();
2526 return NULL;
2527 JVM_END
2528
2529
2530 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2531 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2532 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2533 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2534 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2535 switch (cp->tag_at(cp_index).value()) {
2536 case JVM_CONSTANT_InterfaceMethodref:
2537 case JVM_CONSTANT_Methodref:
2538 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2539 default:
2540 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2541 }
2542 ShouldNotReachHere();
2543 return NULL;
2544 JVM_END
2545
2546
2547 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2548 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2549 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2550 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2551 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2552 switch (cp->tag_at(cp_index).value()) {
2553 case JVM_CONSTANT_Fieldref:
2554 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2555 default:
2556 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2557 }
2558 ShouldNotReachHere();
2559 return NULL;
2560 JVM_END
2561
2562
2563 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2564 JVMWrapper("JVM_GetCPClassNameUTF");
2565 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2566 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2567 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2568 Symbol* classname = cp->klass_name_at(cp_index);
2569 return classname->as_utf8();
2570 JVM_END
2571
2572
2573 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2574 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2575 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2576 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2577 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2578 switch (cp->tag_at(cp_index).value()) {
2579 case JVM_CONSTANT_Fieldref: {
2580 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2581 Symbol* classname = cp->klass_name_at(class_index);
2582 return classname->as_utf8();
2583 }
2584 default:
2585 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2586 }
2587 ShouldNotReachHere();
2588 return NULL;
2589 JVM_END
2590
2591
2592 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2593 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2594 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2595 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2596 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2597 switch (cp->tag_at(cp_index).value()) {
2598 case JVM_CONSTANT_Methodref:
2599 case JVM_CONSTANT_InterfaceMethodref: {
2600 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2601 Symbol* classname = cp->klass_name_at(class_index);
2602 return classname->as_utf8();
2603 }
2604 default:
2605 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2606 }
2607 ShouldNotReachHere();
2608 return NULL;
2609 JVM_END
2610
2611
2612 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2613 JVMWrapper("JVM_GetCPFieldModifiers");
2614 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2615 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2616 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2617 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2618 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2619 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2620 switch (cp->tag_at(cp_index).value()) {
2621 case JVM_CONSTANT_Fieldref: {
2622 Symbol* name = cp->uncached_name_ref_at(cp_index);
2623 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2624 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2625 if (fs.name() == name && fs.signature() == signature) {
2626 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2627 }
2628 }
2629 return -1;
2630 }
2631 default:
2632 fatal("JVM_GetCPFieldModifiers: illegal constant");
2633 }
2634 ShouldNotReachHere();
2635 return 0;
2636 JVM_END
2637
2638
2639 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2640 JVMWrapper("JVM_GetCPMethodModifiers");
2641 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2642 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2643 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2644 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2645 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2646 switch (cp->tag_at(cp_index).value()) {
2647 case JVM_CONSTANT_Methodref:
2648 case JVM_CONSTANT_InterfaceMethodref: {
2649 Symbol* name = cp->uncached_name_ref_at(cp_index);
2650 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2651 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2652 int methods_count = methods->length();
2653 for (int i = 0; i < methods_count; i++) {
2654 Method* method = methods->at(i);
2655 if (method->name() == name && method->signature() == signature) {
2656 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2657 }
2658 }
2659 return -1;
2660 }
2661 default:
2662 fatal("JVM_GetCPMethodModifiers: illegal constant");
2663 }
2664 ShouldNotReachHere();
2665 return 0;
2666 JVM_END
2667
2668
2669 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2670
2671 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2672 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2673 JVM_END
2674
2675
2676 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2677 JVMWrapper("JVM_IsSameClassPackage");
2678 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2679 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2680 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2681 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2682 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2683 JVM_END
2684
2685 // Printing support //////////////////////////////////////////////////
2686 extern "C" {
2687
2688 ATTRIBUTE_PRINTF(3, 0)
2689 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2690 // see bug 4399518, 4417214
2691 if ((intptr_t)count <= 0) return -1;
2692
2693 int result = vsnprintf(str, count, fmt, args);
2694 // Note: on truncation vsnprintf(3) on Unix returns numbers of
2695 // characters which would have been written had the buffer been large
2696 // enough; on Windows, it returns -1. We handle both cases here and
2697 // always return -1, and perform null termination.
2698 if ((result > 0 && (size_t)result >= count) || result == -1) {
2699 str[count - 1] = '\0';
2700 result = -1;
2701 }
2702
2703 return result;
2704 }
2705
2706 ATTRIBUTE_PRINTF(3, 0)
2707 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2708 va_list args;
2709 int len;
2710 va_start(args, fmt);
2711 len = jio_vsnprintf(str, count, fmt, args);
2712 va_end(args);
2713 return len;
2714 }
2715
2716 ATTRIBUTE_PRINTF(2,3)
2717 int jio_fprintf(FILE* f, const char *fmt, ...) {
2718 int len;
2719 va_list args;
2720 va_start(args, fmt);
2721 len = jio_vfprintf(f, fmt, args);
2722 va_end(args);
2723 return len;
2724 }
2725
2726 ATTRIBUTE_PRINTF(2, 0)
2727 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2728 if (Arguments::vfprintf_hook() != NULL) {
2729 return Arguments::vfprintf_hook()(f, fmt, args);
2730 } else {
2731 return vfprintf(f, fmt, args);
2732 }
2733 }
2734
2735 ATTRIBUTE_PRINTF(1, 2)
2736 JNIEXPORT int jio_printf(const char *fmt, ...) {
2737 int len;
2738 va_list args;
2739 va_start(args, fmt);
2740 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2741 va_end(args);
2742 return len;
2743 }
2744
2745
2746 // HotSpot specific jio method
2747 void jio_print(const char* s) {
2748 // Try to make this function as atomic as possible.
2749 if (Arguments::vfprintf_hook() != NULL) {
2750 jio_fprintf(defaultStream::output_stream(), "%s", s);
2751 } else {
2752 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2753 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2754 }
2755 }
2756
2757 } // Extern C
2758
2759 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2760
2761 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2762 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2763 // OSThread objects. The exception to this rule is when the target object is the thread
2764 // doing the operation, in which case we know that the thread won't exit until the
2765 // operation is done (all exits being voluntary). There are a few cases where it is
2766 // rather silly to do operations on yourself, like resuming yourself or asking whether
2767 // you are alive. While these can still happen, they are not subject to deadlocks if
2768 // the lock is held while the operation occurs (this is not the case for suspend, for
2769 // instance), and are very unlikely. Because IsAlive needs to be fast and its
2770 // implementation is local to this file, we always lock Threads_lock for that one.
2771
2772 static void thread_entry(JavaThread* thread, TRAPS) {
2773 HandleMark hm(THREAD);
2774 Handle obj(THREAD, thread->threadObj());
2775 JavaValue result(T_VOID);
2776 JavaCalls::call_virtual(&result,
2777 obj,
2778 KlassHandle(THREAD, SystemDictionary::Thread_klass()),
2779 vmSymbols::run_method_name(),
2780 vmSymbols::void_method_signature(),
2781 THREAD);
2782 }
2783
2784
2785 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2786 JVMWrapper("JVM_StartThread");
2787 JavaThread *native_thread = NULL;
2788
2789 // We cannot hold the Threads_lock when we throw an exception,
2790 // due to rank ordering issues. Example: we might need to grab the
2791 // Heap_lock while we construct the exception.
2792 bool throw_illegal_thread_state = false;
2793
2794 // We must release the Threads_lock before we can post a jvmti event
2795 // in Thread::start.
2796 {
2797 // Ensure that the C++ Thread and OSThread structures aren't freed before
2798 // we operate.
2799 MutexLocker mu(Threads_lock);
2800
2801 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2802 // re-starting an already started thread, so we should usually find
2803 // that the JavaThread is null. However for a JNI attached thread
2804 // there is a small window between the Thread object being created
2805 // (with its JavaThread set) and the update to its threadStatus, so we
2806 // have to check for this
2807 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2808 throw_illegal_thread_state = true;
2809 } else {
2810 // We could also check the stillborn flag to see if this thread was already stopped, but
2811 // for historical reasons we let the thread detect that itself when it starts running
2812
2813 jlong size =
2814 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2815 // Allocate the C++ Thread structure and create the native thread. The
2816 // stack size retrieved from java is signed, but the constructor takes
2817 // size_t (an unsigned type), so avoid passing negative values which would
2818 // result in really large stacks.
2819 size_t sz = size > 0 ? (size_t) size : 0;
2820 native_thread = new JavaThread(&thread_entry, sz);
2821
2822 // At this point it may be possible that no osthread was created for the
2823 // JavaThread due to lack of memory. Check for this situation and throw
2824 // an exception if necessary. Eventually we may want to change this so
2825 // that we only grab the lock if the thread was created successfully -
2826 // then we can also do this check and throw the exception in the
2827 // JavaThread constructor.
2828 if (native_thread->osthread() != NULL) {
2829 // Note: the current thread is not being used within "prepare".
2830 native_thread->prepare(jthread);
2831 }
2832 }
2833 }
2834
2835 if (throw_illegal_thread_state) {
2836 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2837 }
2838
2839 assert(native_thread != NULL, "Starting null thread?");
2840
2841 if (native_thread->osthread() == NULL) {
2842 // No one should hold a reference to the 'native_thread'.
2843 delete native_thread;
2844 if (JvmtiExport::should_post_resource_exhausted()) {
2845 JvmtiExport::post_resource_exhausted(
2846 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2847 os::native_thread_creation_failed_msg());
2848 }
2849 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2850 os::native_thread_creation_failed_msg());
2851 }
2852
2853 Thread::start(native_thread);
2854
2855 JVM_END
2856
2857 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2858 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2859 // but is thought to be reliable and simple. In the case, where the receiver is the
2860 // same thread as the sender, no safepoint is needed.
2861 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2862 JVMWrapper("JVM_StopThread");
2863
2864 oop java_throwable = JNIHandles::resolve(throwable);
2865 if (java_throwable == NULL) {
2866 THROW(vmSymbols::java_lang_NullPointerException());
2867 }
2868 oop java_thread = JNIHandles::resolve_non_null(jthread);
2869 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2870 Events::log_exception(JavaThread::current(),
2871 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2872 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2873 // First check if thread is alive
2874 if (receiver != NULL) {
2875 // Check if exception is getting thrown at self (use oop equality, since the
2876 // target object might exit)
2877 if (java_thread == thread->threadObj()) {
2878 THROW_OOP(java_throwable);
2879 } else {
2880 // Enques a VM_Operation to stop all threads and then deliver the exception...
2881 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2882 }
2883 }
2884 else {
2885 // Either:
2886 // - target thread has not been started before being stopped, or
2887 // - target thread already terminated
2888 // We could read the threadStatus to determine which case it is
2889 // but that is overkill as it doesn't matter. We must set the
2890 // stillborn flag for the first case, and if the thread has already
2891 // exited setting this flag has no affect
2892 java_lang_Thread::set_stillborn(java_thread);
2893 }
2894 JVM_END
2895
2896
2897 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2898 JVMWrapper("JVM_IsThreadAlive");
2899
2900 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2901 return java_lang_Thread::is_alive(thread_oop);
2902 JVM_END
2903
2904
2905 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2906 JVMWrapper("JVM_SuspendThread");
2907 oop java_thread = JNIHandles::resolve_non_null(jthread);
2908 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2909
2910 if (receiver != NULL) {
2911 // thread has run and has not exited (still on threads list)
2912
2913 {
2914 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2915 if (receiver->is_external_suspend()) {
2916 // Don't allow nested external suspend requests. We can't return
2917 // an error from this interface so just ignore the problem.
2918 return;
2919 }
2920 if (receiver->is_exiting()) { // thread is in the process of exiting
2921 return;
2922 }
2923 receiver->set_external_suspend();
2924 }
2925
2926 // java_suspend() will catch threads in the process of exiting
2927 // and will ignore them.
2928 receiver->java_suspend();
2929
2930 // It would be nice to have the following assertion in all the
2931 // time, but it is possible for a racing resume request to have
2932 // resumed this thread right after we suspended it. Temporarily
2933 // enable this assertion if you are chasing a different kind of
2934 // bug.
2935 //
2936 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2937 // receiver->is_being_ext_suspended(), "thread is not suspended");
2938 }
2939 JVM_END
2940
2941
2942 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2943 JVMWrapper("JVM_ResumeThread");
2944 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2945 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2946 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2947 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2948 // looks at it.
2949 MutexLocker ml(Threads_lock);
2950 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2951 if (thr != NULL) {
2952 // the thread has run and is not in the process of exiting
2953 thr->java_resume();
2954 }
2955 JVM_END
2956
2957
2958 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2959 JVMWrapper("JVM_SetThreadPriority");
2960 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2961 MutexLocker ml(Threads_lock);
2962 oop java_thread = JNIHandles::resolve_non_null(jthread);
2963 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2964 JavaThread* thr = java_lang_Thread::thread(java_thread);
2965 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
2966 Thread::set_priority(thr, (ThreadPriority)prio);
2967 }
2968 JVM_END
2969
2970
2971 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2972 JVMWrapper("JVM_Yield");
2973 if (os::dont_yield()) return;
2974 HOTSPOT_THREAD_YIELD();
2975
2976 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
2977 // Critical for similar threading behaviour
2978 if (ConvertYieldToSleep) {
2979 os::sleep(thread, MinSleepInterval, false);
2980 } else {
2981 os::naked_yield();
2982 }
2983 JVM_END
2984
2985
2986 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2987 JVMWrapper("JVM_Sleep");
2988
2989 if (millis < 0) {
2990 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2991 }
2992
2993 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2994 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2995 }
2996
2997 // Save current thread state and restore it at the end of this block.
2998 // And set new thread state to SLEEPING.
2999 JavaThreadSleepState jtss(thread);
3000
3001 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3002
3003 EventThreadSleep event;
3004
3005 if (millis == 0) {
3006 // When ConvertSleepToYield is on, this matches the classic VM implementation of
3007 // JVM_Sleep. Critical for similar threading behaviour (Win32)
3008 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
3009 // for SOLARIS
3010 if (ConvertSleepToYield) {
3011 os::naked_yield();
3012 } else {
3013 ThreadState old_state = thread->osthread()->get_state();
3014 thread->osthread()->set_state(SLEEPING);
3015 os::sleep(thread, MinSleepInterval, false);
3016 thread->osthread()->set_state(old_state);
3017 }
3018 } else {
3019 ThreadState old_state = thread->osthread()->get_state();
3020 thread->osthread()->set_state(SLEEPING);
3021 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3022 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3023 // us while we were sleeping. We do not overwrite those.
3024 if (!HAS_PENDING_EXCEPTION) {
3025 if (event.should_commit()) {
3026 event.set_time(millis);
3027 event.commit();
3028 }
3029 HOTSPOT_THREAD_SLEEP_END(1);
3030
3031 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3032 // to properly restore the thread state. That's likely wrong.
3033 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3034 }
3035 }
3036 thread->osthread()->set_state(old_state);
3037 }
3038 if (event.should_commit()) {
3039 event.set_time(millis);
3040 event.commit();
3041 }
3042 HOTSPOT_THREAD_SLEEP_END(0);
3043 JVM_END
3044
3045 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3046 JVMWrapper("JVM_CurrentThread");
3047 oop jthread = thread->threadObj();
3048 assert (thread != NULL, "no current thread!");
3049 return JNIHandles::make_local(env, jthread);
3050 JVM_END
3051
3052
3053 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3054 JVMWrapper("JVM_CountStackFrames");
3055
3056 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3057 oop java_thread = JNIHandles::resolve_non_null(jthread);
3058 bool throw_illegal_thread_state = false;
3059 int count = 0;
3060
3061 {
3062 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3063 // We need to re-resolve the java_thread, since a GC might have happened during the
3064 // acquire of the lock
3065 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3066
3067 if (thr == NULL) {
3068 // do nothing
3069 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
3070 // Check whether this java thread has been suspended already. If not, throws
3071 // IllegalThreadStateException. We defer to throw that exception until
3072 // Threads_lock is released since loading exception class has to leave VM.
3073 // The correct way to test a thread is actually suspended is
3074 // wait_for_ext_suspend_completion(), but we can't call that while holding
3075 // the Threads_lock. The above tests are sufficient for our purposes
3076 // provided the walkability of the stack is stable - which it isn't
3077 // 100% but close enough for most practical purposes.
3078 throw_illegal_thread_state = true;
3079 } else {
3080 // Count all java activation, i.e., number of vframes
3081 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
3082 // Native frames are not counted
3083 if (!vfst.method()->is_native()) count++;
3084 }
3085 }
3086 }
3087
3088 if (throw_illegal_thread_state) {
3089 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3090 "this thread is not suspended");
3091 }
3092 return count;
3093 JVM_END
3094
3095 // Consider: A better way to implement JVM_Interrupt() is to acquire
3096 // Threads_lock to resolve the jthread into a Thread pointer, fetch
3097 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
3098 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
3099 // outside the critical section. Threads_lock is hot so we want to minimize
3100 // the hold-time. A cleaner interface would be to decompose interrupt into
3101 // two steps. The 1st phase, performed under Threads_lock, would return
3102 // a closure that'd be invoked after Threads_lock was dropped.
3103 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
3104 // admit spurious wakeups.
3105
3106 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3107 JVMWrapper("JVM_Interrupt");
3108
3109 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3110 oop java_thread = JNIHandles::resolve_non_null(jthread);
3111 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3112 // We need to re-resolve the java_thread, since a GC might have happened during the
3113 // acquire of the lock
3114 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3115 if (thr != NULL) {
3116 Thread::interrupt(thr);
3117 }
3118 JVM_END
3119
3120
3121 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3122 JVMWrapper("JVM_IsInterrupted");
3123
3124 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3125 oop java_thread = JNIHandles::resolve_non_null(jthread);
3126 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3127 // We need to re-resolve the java_thread, since a GC might have happened during the
3128 // acquire of the lock
3129 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3130 if (thr == NULL) {
3131 return JNI_FALSE;
3132 } else {
3133 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3134 }
3135 JVM_END
3136
3137
3138 // Return true iff the current thread has locked the object passed in
3139
3140 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3141 JVMWrapper("JVM_HoldsLock");
3142 assert(THREAD->is_Java_thread(), "sanity check");
3143 if (obj == NULL) {
3144 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3145 }
3146 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3147 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3148 JVM_END
3149
3150
3151 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3152 JVMWrapper("JVM_DumpAllStacks");
3153 VM_PrintThreads op;
3154 VMThread::execute(&op);
3155 if (JvmtiExport::should_post_data_dump()) {
3156 JvmtiExport::post_data_dump();
3157 }
3158 JVM_END
3159
3160 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3161 JVMWrapper("JVM_SetNativeThreadName");
3162 ResourceMark rm(THREAD);
3163 oop java_thread = JNIHandles::resolve_non_null(jthread);
3164 JavaThread* thr = java_lang_Thread::thread(java_thread);
3165 // Thread naming only supported for the current thread, doesn't work for
3166 // target threads.
3167 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3168 // we don't set the name of an attached thread to avoid stepping
3169 // on other programs
3170 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3171 os::set_native_thread_name(thread_name);
3172 }
3173 JVM_END
3174
3175 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3176
3177 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3178 assert(jthread->is_Java_thread(), "must be a Java thread");
3179 if (jthread->privileged_stack_top() == NULL) return false;
3180 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3181 oop loader = jthread->privileged_stack_top()->class_loader();
3182 if (loader == NULL) return true;
3183 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3184 if (trusted) return true;
3185 }
3186 return false;
3187 }
3188
3189 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3190 JVMWrapper("JVM_CurrentLoadedClass");
3191 ResourceMark rm(THREAD);
3192
3193 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3194 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3195 bool trusted = is_trusted_frame(thread, &vfst);
3196 if (trusted) return NULL;
3197
3198 Method* m = vfst.method();
3199 if (!m->is_native()) {
3200 InstanceKlass* holder = m->method_holder();
3201 oop loader = holder->class_loader();
3202 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3203 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3204 }
3205 }
3206 }
3207 return NULL;
3208 JVM_END
3209
3210
3211 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3212 JVMWrapper("JVM_CurrentClassLoader");
3213 ResourceMark rm(THREAD);
3214
3215 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3216
3217 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3218 bool trusted = is_trusted_frame(thread, &vfst);
3219 if (trusted) return NULL;
3220
3221 Method* m = vfst.method();
3222 if (!m->is_native()) {
3223 InstanceKlass* holder = m->method_holder();
3224 assert(holder->is_klass(), "just checking");
3225 oop loader = holder->class_loader();
3226 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3227 return JNIHandles::make_local(env, loader);
3228 }
3229 }
3230 }
3231 return NULL;
3232 JVM_END
3233
3234
3235 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3236 JVMWrapper("JVM_GetClassContext");
3237 ResourceMark rm(THREAD);
3238 JvmtiVMObjectAllocEventCollector oam;
3239 vframeStream vfst(thread);
3240
3241 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3242 // This must only be called from SecurityManager.getClassContext
3243 Method* m = vfst.method();
3244 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3245 m->name() == vmSymbols::getClassContext_name() &&
3246 m->signature() == vmSymbols::void_class_array_signature())) {
3247 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3248 }
3249 }
3250
3251 // Collect method holders
3252 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3253 for (; !vfst.at_end(); vfst.security_next()) {
3254 Method* m = vfst.method();
3255 // Native frames are not returned
3256 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3257 Klass* holder = m->method_holder();
3258 assert(holder->is_klass(), "just checking");
3259 klass_array->append(holder);
3260 }
3261 }
3262
3263 // Create result array of type [Ljava/lang/Class;
3264 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3265 // Fill in mirrors corresponding to method holders
3266 for (int i = 0; i < klass_array->length(); i++) {
3267 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3268 }
3269
3270 return (jobjectArray) JNIHandles::make_local(env, result);
3271 JVM_END
3272
3273
3274 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3275 JVMWrapper("JVM_ClassDepth");
3276 ResourceMark rm(THREAD);
3277 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3278 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3279
3280 const char* str = java_lang_String::as_utf8_string(class_name_str());
3281 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3282 if (class_name_sym == NULL) {
3283 return -1;
3284 }
3285
3286 int depth = 0;
3287
3288 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3289 if (!vfst.method()->is_native()) {
3290 InstanceKlass* holder = vfst.method()->method_holder();
3291 assert(holder->is_klass(), "just checking");
3292 if (holder->name() == class_name_sym) {
3293 return depth;
3294 }
3295 depth++;
3296 }
3297 }
3298 return -1;
3299 JVM_END
3300
3301
3302 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3303 JVMWrapper("JVM_ClassLoaderDepth");
3304 ResourceMark rm(THREAD);
3305 int depth = 0;
3306 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3307 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3308 bool trusted = is_trusted_frame(thread, &vfst);
3309 if (trusted) return -1;
3310
3311 Method* m = vfst.method();
3312 if (!m->is_native()) {
3313 InstanceKlass* holder = m->method_holder();
3314 assert(holder->is_klass(), "just checking");
3315 oop loader = holder->class_loader();
3316 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3317 return depth;
3318 }
3319 depth++;
3320 }
3321 }
3322 return -1;
3323 JVM_END
3324
3325
3326 // java.lang.Package ////////////////////////////////////////////////////////////////
3327
3328
3329 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3330 JVMWrapper("JVM_GetSystemPackage");
3331 ResourceMark rm(THREAD);
3332 JvmtiVMObjectAllocEventCollector oam;
3333 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3334 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3335 return (jstring) JNIHandles::make_local(result);
3336 JVM_END
3337
3338
3339 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3340 JVMWrapper("JVM_GetSystemPackages");
3341 JvmtiVMObjectAllocEventCollector oam;
3342 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3343 return (jobjectArray) JNIHandles::make_local(result);
3344 JVM_END
3345
3346
3347 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3348
3349
3350 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3351 JVMWrapper("JVM_GetAndClearReferencePendingList");
3352
3353 MonitorLockerEx ml(Heap_lock);
3354 oop ref = Universe::reference_pending_list();
3355 if (ref != NULL) {
3356 Universe::set_reference_pending_list(NULL);
3357 }
3358 return JNIHandles::make_local(env, ref);
3359 JVM_END
3360
3361 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3362 JVMWrapper("JVM_HasReferencePendingList");
3363 MonitorLockerEx ml(Heap_lock);
3364 return Universe::has_reference_pending_list();
3365 JVM_END
3366
3367 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3368 JVMWrapper("JVM_WaitForReferencePendingList");
3369 MonitorLockerEx ml(Heap_lock);
3370 while (!Universe::has_reference_pending_list()) {
3371 ml.wait();
3372 }
3373 JVM_END
3374
3375
3376 // ObjectInputStream ///////////////////////////////////////////////////////////////
3377
3378 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3379 if (current_class == NULL) {
3380 return true;
3381 }
3382 if ((current_class == field_class) || access.is_public()) {
3383 return true;
3384 }
3385
3386 if (access.is_protected()) {
3387 // See if current_class is a subclass of field_class
3388 if (current_class->is_subclass_of(field_class)) {
3389 return true;
3390 }
3391 }
3392
3393 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3394 }
3395
3396 // Return the first user-defined class loader up the execution stack, or null
3397 // if only code from the bootstrap or platform class loader is on the stack.
3398
3399 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3400 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3401 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3402 oop loader = vfst.method()->method_holder()->class_loader();
3403 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3404 return JNIHandles::make_local(env, loader);
3405 }
3406 }
3407 return NULL;
3408 JVM_END
3409
3410
3411 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3412
3413
3414 // resolve array handle and check arguments
3415 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3416 if (arr == NULL) {
3417 THROW_0(vmSymbols::java_lang_NullPointerException());
3418 }
3419 oop a = JNIHandles::resolve_non_null(arr);
3420 if (!a->is_array()) {
3421 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3422 } else if (type_array_only && !a->is_typeArray()) {
3423 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3424 }
3425 return arrayOop(a);
3426 }
3427
3428
3429 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3430 JVMWrapper("JVM_GetArrayLength");
3431 arrayOop a = check_array(env, arr, false, CHECK_0);
3432 return a->length();
3433 JVM_END
3434
3435
3436 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3437 JVMWrapper("JVM_Array_Get");
3438 JvmtiVMObjectAllocEventCollector oam;
3439 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3440 jvalue value;
3441 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3442 oop box = Reflection::box(&value, type, CHECK_NULL);
3443 return JNIHandles::make_local(env, box);
3444 JVM_END
3445
3446
3447 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3448 JVMWrapper("JVM_GetPrimitiveArrayElement");
3449 jvalue value;
3450 value.i = 0; // to initialize value before getting used in CHECK
3451 arrayOop a = check_array(env, arr, true, CHECK_(value));
3452 assert(a->is_typeArray(), "just checking");
3453 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3454 BasicType wide_type = (BasicType) wCode;
3455 if (type != wide_type) {
3456 Reflection::widen(&value, type, wide_type, CHECK_(value));
3457 }
3458 return value;
3459 JVM_END
3460
3461
3462 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3463 JVMWrapper("JVM_SetArrayElement");
3464 arrayOop a = check_array(env, arr, false, CHECK);
3465 oop box = JNIHandles::resolve(val);
3466 jvalue value;
3467 value.i = 0; // to initialize value before getting used in CHECK
3468 BasicType value_type;
3469 if (a->is_objArray()) {
3470 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3471 value_type = Reflection::unbox_for_regular_object(box, &value);
3472 } else {
3473 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3474 }
3475 Reflection::array_set(&value, a, index, value_type, CHECK);
3476 JVM_END
3477
3478
3479 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3480 JVMWrapper("JVM_SetPrimitiveArrayElement");
3481 arrayOop a = check_array(env, arr, true, CHECK);
3482 assert(a->is_typeArray(), "just checking");
3483 BasicType value_type = (BasicType) vCode;
3484 Reflection::array_set(&v, a, index, value_type, CHECK);
3485 JVM_END
3486
3487
3488 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3489 JVMWrapper("JVM_NewArray");
3490 JvmtiVMObjectAllocEventCollector oam;
3491 oop element_mirror = JNIHandles::resolve(eltClass);
3492 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3493 return JNIHandles::make_local(env, result);
3494 JVM_END
3495
3496
3497 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3498 JVMWrapper("JVM_NewMultiArray");
3499 JvmtiVMObjectAllocEventCollector oam;
3500 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3501 oop element_mirror = JNIHandles::resolve(eltClass);
3502 assert(dim_array->is_typeArray(), "just checking");
3503 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3504 return JNIHandles::make_local(env, result);
3505 JVM_END
3506
3507
3508 // Library support ///////////////////////////////////////////////////////////////////////////
3509
3510 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3511 //%note jvm_ct
3512 JVMWrapper("JVM_LoadLibrary");
3513 char ebuf[1024];
3514 void *load_result;
3515 {
3516 ThreadToNativeFromVM ttnfvm(thread);
3517 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3518 }
3519 if (load_result == NULL) {
3520 char msg[1024];
3521 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3522 // Since 'ebuf' may contain a string encoded using
3523 // platform encoding scheme, we need to pass
3524 // Exceptions::unsafe_to_utf8 to the new_exception method
3525 // as the last argument. See bug 6367357.
3526 Handle h_exception =
3527 Exceptions::new_exception(thread,
3528 vmSymbols::java_lang_UnsatisfiedLinkError(),
3529 msg, Exceptions::unsafe_to_utf8);
3530
3531 THROW_HANDLE_0(h_exception);
3532 }
3533 return load_result;
3534 JVM_END
3535
3536
3537 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3538 JVMWrapper("JVM_UnloadLibrary");
3539 os::dll_unload(handle);
3540 JVM_END
3541
3542
3543 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3544 JVMWrapper("JVM_FindLibraryEntry");
3545 return os::dll_lookup(handle, name);
3546 JVM_END
3547
3548
3549 // JNI version ///////////////////////////////////////////////////////////////////////////////
3550
3551 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3552 JVMWrapper("JVM_IsSupportedJNIVersion");
3553 return Threads::is_supported_jni_version_including_1_1(version);
3554 JVM_END
3555
3556
3557 // String support ///////////////////////////////////////////////////////////////////////////
3558
3559 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3560 JVMWrapper("JVM_InternString");
3561 JvmtiVMObjectAllocEventCollector oam;
3562 if (str == NULL) return NULL;
3563 oop string = JNIHandles::resolve_non_null(str);
3564 oop result = StringTable::intern(string, CHECK_NULL);
3565 return (jstring) JNIHandles::make_local(env, result);
3566 JVM_END
3567
3568
3569 // Raw monitor support //////////////////////////////////////////////////////////////////////
3570
3571 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3572 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3573 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3574 // that only works with java threads.
3575
3576
3577 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3578 VM_Exit::block_if_vm_exited();
3579 JVMWrapper("JVM_RawMonitorCreate");
3580 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3581 }
3582
3583
3584 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3585 VM_Exit::block_if_vm_exited();
3586 JVMWrapper("JVM_RawMonitorDestroy");
3587 delete ((Mutex*) mon);
3588 }
3589
3590
3591 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3592 VM_Exit::block_if_vm_exited();
3593 JVMWrapper("JVM_RawMonitorEnter");
3594 ((Mutex*) mon)->jvm_raw_lock();
3595 return 0;
3596 }
3597
3598
3599 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3600 VM_Exit::block_if_vm_exited();
3601 JVMWrapper("JVM_RawMonitorExit");
3602 ((Mutex*) mon)->jvm_raw_unlock();
3603 }
3604
3605
3606 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3607
3608 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3609 Handle loader, Handle protection_domain,
3610 jboolean throwError, TRAPS) {
3611 // Security Note:
3612 // The Java level wrapper will perform the necessary security check allowing
3613 // us to pass the NULL as the initiating class loader. The VM is responsible for
3614 // the checkPackageAccess relative to the initiating class loader via the
3615 // protection_domain. The protection_domain is passed as NULL by the java code
3616 // if there is no security manager in 3-arg Class.forName().
3617 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3618
3619 KlassHandle klass_handle(THREAD, klass);
3620 // Check if we should initialize the class
3621 if (init && klass_handle->is_instance_klass()) {
3622 klass_handle->initialize(CHECK_NULL);
3623 }
3624 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
3625 }
3626
3627
3628 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3629
3630 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3631 JVMWrapper("JVM_InvokeMethod");
3632 Handle method_handle;
3633 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3634 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3635 Handle receiver(THREAD, JNIHandles::resolve(obj));
3636 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3637 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3638 jobject res = JNIHandles::make_local(env, result);
3639 if (JvmtiExport::should_post_vm_object_alloc()) {
3640 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3641 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3642 if (java_lang_Class::is_primitive(ret_type)) {
3643 // Only for primitive type vm allocates memory for java object.
3644 // See box() method.
3645 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3646 }
3647 }
3648 return res;
3649 } else {
3650 THROW_0(vmSymbols::java_lang_StackOverflowError());
3651 }
3652 JVM_END
3653
3654
3655 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3656 JVMWrapper("JVM_NewInstanceFromConstructor");
3657 oop constructor_mirror = JNIHandles::resolve(c);
3658 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3659 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3660 jobject res = JNIHandles::make_local(env, result);
3661 if (JvmtiExport::should_post_vm_object_alloc()) {
3662 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3663 }
3664 return res;
3665 JVM_END
3666
3667 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3668
3669 JVM_LEAF(jboolean, JVM_SupportsCX8())
3670 JVMWrapper("JVM_SupportsCX8");
3671 return VM_Version::supports_cx8();
3672 JVM_END
3673
3674 // Returns an array of all live Thread objects (VM internal JavaThreads,
3675 // jvmti agent threads, and JNI attaching threads are skipped)
3676 // See CR 6404306 regarding JNI attaching threads
3677 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3678 ResourceMark rm(THREAD);
3679 ThreadsListEnumerator tle(THREAD, false, false);
3680 JvmtiVMObjectAllocEventCollector oam;
3681
3682 int num_threads = tle.num_threads();
3683 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3684 objArrayHandle threads_ah(THREAD, r);
3685
3686 for (int i = 0; i < num_threads; i++) {
3687 Handle h = tle.get_threadObj(i);
3688 threads_ah->obj_at_put(i, h());
3689 }
3690
3691 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3692 JVM_END
3693
3694
3695 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3696 // Return StackTraceElement[][], each element is the stack trace of a thread in
3697 // the corresponding entry in the given threads array
3698 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3699 JVMWrapper("JVM_DumpThreads");
3700 JvmtiVMObjectAllocEventCollector oam;
3701
3702 // Check if threads is null
3703 if (threads == NULL) {
3704 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3705 }
3706
3707 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3708 objArrayHandle ah(THREAD, a);
3709 int num_threads = ah->length();
3710 // check if threads is non-empty array
3711 if (num_threads == 0) {
3712 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3713 }
3714
3715 // check if threads is not an array of objects of Thread class
3716 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3717 if (k != SystemDictionary::Thread_klass()) {
3718 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3719 }
3720
3721 ResourceMark rm(THREAD);
3722
3723 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3724 for (int i = 0; i < num_threads; i++) {
3725 oop thread_obj = ah->obj_at(i);
3726 instanceHandle h(THREAD, (instanceOop) thread_obj);
3727 thread_handle_array->append(h);
3728 }
3729
3730 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3731 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3732
3733 JVM_END
3734
3735 // JVM monitoring and management support
3736 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3737 return Management::get_jmm_interface(version);
3738 JVM_END
3739
3740 // com.sun.tools.attach.VirtualMachine agent properties support
3741 //
3742 // Initialize the agent properties with the properties maintained in the VM
3743 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3744 JVMWrapper("JVM_InitAgentProperties");
3745 ResourceMark rm;
3746
3747 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3748
3749 PUTPROP(props, "sun.java.command", Arguments::java_command());
3750 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3751 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3752 return properties;
3753 JVM_END
3754
3755 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3756 {
3757 JVMWrapper("JVM_GetEnclosingMethodInfo");
3758 JvmtiVMObjectAllocEventCollector oam;
3759
3760 if (ofClass == NULL) {
3761 return NULL;
3762 }
3763 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3764 // Special handling for primitive objects
3765 if (java_lang_Class::is_primitive(mirror())) {
3766 return NULL;
3767 }
3768 Klass* k = java_lang_Class::as_Klass(mirror());
3769 if (!k->is_instance_klass()) {
3770 return NULL;
3771 }
3772 instanceKlassHandle ik_h(THREAD, k);
3773 int encl_method_class_idx = ik_h->enclosing_method_class_index();
3774 if (encl_method_class_idx == 0) {
3775 return NULL;
3776 }
3777 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3778 objArrayHandle dest(THREAD, dest_o);
3779 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3780 dest->obj_at_put(0, enc_k->java_mirror());
3781 int encl_method_method_idx = ik_h->enclosing_method_method_index();
3782 if (encl_method_method_idx != 0) {
3783 Symbol* sym = ik_h->constants()->symbol_at(
3784 extract_low_short_from_int(
3785 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3786 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3787 dest->obj_at_put(1, str());
3788 sym = ik_h->constants()->symbol_at(
3789 extract_high_short_from_int(
3790 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3791 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3792 dest->obj_at_put(2, str());
3793 }
3794 return (jobjectArray) JNIHandles::make_local(dest());
3795 }
3796 JVM_END
3797
3798 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3799 {
3800 memset(info, 0, info_size);
3801
3802 info->jvm_version = Abstract_VM_Version::jvm_version();
3803 info->patch_version = Abstract_VM_Version::vm_patch_version();
3804
3805 // when we add a new capability in the jvm_version_info struct, we should also
3806 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3807 // counter defined in runtimeService.cpp.
3808 info->is_attachable = AttachListener::is_attach_supported();
3809 }
3810 JVM_END
3811
3812 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3813 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3814 ResourceMark rm(THREAD);
3815
3816 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3817 return NULL;
3818 }
3819
3820 char** vm_flags = Arguments::jvm_flags_array();
3821 char** vm_args = Arguments::jvm_args_array();
3822 int num_flags = Arguments::num_jvm_flags();
3823 int num_args = Arguments::num_jvm_args();
3824
3825 instanceKlassHandle ik (THREAD, SystemDictionary::String_klass());
3826 objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL);
3827 objArrayHandle result_h(THREAD, r);
3828
3829 int index = 0;
3830 for (int j = 0; j < num_flags; j++, index++) {
3831 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3832 result_h->obj_at_put(index, h());
3833 }
3834 for (int i = 0; i < num_args; i++, index++) {
3835 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3836 result_h->obj_at_put(index, h());
3837 }
3838 return (jobjectArray) JNIHandles::make_local(env, result_h());
3839 JVM_END
3840
3841 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3842 return os::get_signal_number(name);
3843 JVM_END