1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/modules.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/stringTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/vmSymbols.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/access.inline.hpp"
44 #include "oops/fieldStreams.hpp"
45 #include "oops/instanceKlass.hpp"
46 #include "oops/method.hpp"
47 #include "oops/objArrayKlass.hpp"
48 #include "oops/objArrayOop.inline.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/jvm_misc.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "prims/jvmtiThreadState.hpp"
53 #include "prims/nativeLookup.hpp"
54 #include "prims/privilegedStack.hpp"
55 #include "prims/stackwalk.hpp"
56 #include "runtime/arguments.hpp"
57 #include "runtime/atomic.hpp"
58 #include "runtime/handles.inline.hpp"
59 #include "runtime/init.hpp"
60 #include "runtime/interfaceSupport.hpp"
61 #include "runtime/java.hpp"
62 #include "runtime/javaCalls.hpp"
63 #include "runtime/jfieldIDWorkaround.hpp"
64 #include "runtime/orderAccess.inline.hpp"
65 #include "runtime/os.inline.hpp"
66 #include "runtime/perfData.hpp"
67 #include "runtime/reflection.hpp"
68 #include "runtime/thread.inline.hpp"
69 #include "runtime/threadSMR.hpp"
70 #include "runtime/vframe.hpp"
71 #include "runtime/vm_operations.hpp"
72 #include "runtime/vm_version.hpp"
73 #include "services/attachListener.hpp"
74 #include "services/management.hpp"
75 #include "services/threadService.hpp"
76 #include "trace/tracing.hpp"
77 #include "utilities/copy.hpp"
78 #include "utilities/defaultStream.hpp"
79 #include "utilities/dtrace.hpp"
80 #include "utilities/events.hpp"
81 #include "utilities/histogram.hpp"
82 #include "utilities/macros.hpp"
83 #include "utilities/utf8.hpp"
84 #if INCLUDE_CDS
85 #include "classfile/sharedClassUtil.hpp"
86 #include "classfile/systemDictionaryShared.hpp"
87 #endif
88
89 #include <errno.h>
90
91 /*
92 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
93 such ctors and calls MUST NOT come between an oop declaration/init and its
94 usage because if objects are move this may cause various memory stomps, bus
95 errors and segfaults. Here is a cookbook for causing so called "naked oop
96 failures":
97
98 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
99 JVMWrapper("JVM_GetClassDeclaredFields");
100
101 // Object address to be held directly in mirror & not visible to GC
102 oop mirror = JNIHandles::resolve_non_null(ofClass);
103
104 // If this ctor can hit a safepoint, moving objects around, then
105 ComplexConstructor foo;
106
107 // Boom! mirror may point to JUNK instead of the intended object
108 (some dereference of mirror)
109
110 // Here's another call that may block for GC, making mirror stale
111 MutexLocker ml(some_lock);
112
113 // And here's an initializer that can result in a stale oop
114 // all in one step.
115 oop o = call_that_can_throw_exception(TRAPS);
116
117
118 The solution is to keep the oop declaration BELOW the ctor or function
119 call that might cause a GC, do another resolve to reassign the oop, or
120 consider use of a Handle instead of an oop so there is immunity from object
121 motion. But note that the "QUICK" entries below do not have a handlemark
122 and thus can only support use of handles passed in.
123 */
124
125 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
126 ResourceMark rm;
127 int line_number = -1;
128 const char * source_file = NULL;
129 const char * trace = "explicit";
130 InstanceKlass* caller = NULL;
131 JavaThread* jthread = JavaThread::current();
132 if (jthread->has_last_Java_frame()) {
133 vframeStream vfst(jthread);
134
135 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
136 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
137 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
138 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
139 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
140
141 Method* last_caller = NULL;
142
143 while (!vfst.at_end()) {
144 Method* m = vfst.method();
145 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
146 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
147 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
148 break;
149 }
150 last_caller = m;
151 vfst.next();
152 }
153 // if this is called from Class.forName0 and that is called from Class.forName,
154 // then print the caller of Class.forName. If this is Class.loadClass, then print
155 // that caller, otherwise keep quiet since this should be picked up elsewhere.
156 bool found_it = false;
157 if (!vfst.at_end() &&
158 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
159 vfst.method()->name() == vmSymbols::forName0_name()) {
160 vfst.next();
161 if (!vfst.at_end() &&
162 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
163 vfst.method()->name() == vmSymbols::forName_name()) {
164 vfst.next();
165 found_it = true;
166 }
167 } else if (last_caller != NULL &&
168 last_caller->method_holder()->name() ==
169 vmSymbols::java_lang_ClassLoader() &&
170 (last_caller->name() == vmSymbols::loadClassInternal_name() ||
171 last_caller->name() == vmSymbols::loadClass_name())) {
172 found_it = true;
173 } else if (!vfst.at_end()) {
174 if (vfst.method()->is_native()) {
175 // JNI call
176 found_it = true;
177 }
178 }
179 if (found_it && !vfst.at_end()) {
180 // found the caller
181 caller = vfst.method()->method_holder();
182 line_number = vfst.method()->line_number_from_bci(vfst.bci());
183 if (line_number == -1) {
184 // show method name if it's a native method
185 trace = vfst.method()->name_and_sig_as_C_string();
186 }
187 Symbol* s = caller->source_file_name();
188 if (s != NULL) {
189 source_file = s->as_C_string();
190 }
191 }
192 }
193 if (caller != NULL) {
194 if (to_class != caller) {
195 const char * from = caller->external_name();
196 const char * to = to_class->external_name();
197 // print in a single call to reduce interleaving between threads
198 if (source_file != NULL) {
199 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
200 } else {
201 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
202 }
203 }
204 }
205 }
206
207 void trace_class_resolution(Klass* to_class) {
208 EXCEPTION_MARK;
209 trace_class_resolution_impl(to_class, THREAD);
210 if (HAS_PENDING_EXCEPTION) {
211 CLEAR_PENDING_EXCEPTION;
212 }
213 }
214
215 // Wrapper to trace JVM functions
216
217 #ifdef ASSERT
218 Histogram* JVMHistogram;
219 volatile int JVMHistogram_lock = 0;
220
221 class JVMHistogramElement : public HistogramElement {
222 public:
223 JVMHistogramElement(const char* name);
224 };
225
226 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
227 _name = elementName;
228 uintx count = 0;
229
230 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
231 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
232 count +=1;
233 if ( (WarnOnStalledSpinLock > 0)
234 && (count % WarnOnStalledSpinLock == 0)) {
235 warning("JVMHistogram_lock seems to be stalled");
236 }
237 }
238 }
239
240 if(JVMHistogram == NULL)
241 JVMHistogram = new Histogram("JVM Call Counts",100);
242
243 JVMHistogram->add_element(this);
244 Atomic::dec(&JVMHistogram_lock);
245 }
246
247 #define JVMCountWrapper(arg) \
248 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
249 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
250
251 #define JVMWrapper(arg) JVMCountWrapper(arg);
252 #else
253 #define JVMWrapper(arg)
254 #endif
255
256
257 // Interface version /////////////////////////////////////////////////////////////////////
258
259
260 JVM_LEAF(jint, JVM_GetInterfaceVersion())
261 return JVM_INTERFACE_VERSION;
262 JVM_END
263
264
265 // java.lang.System //////////////////////////////////////////////////////////////////////
266
267
268 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
269 JVMWrapper("JVM_CurrentTimeMillis");
270 return os::javaTimeMillis();
271 JVM_END
272
273 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
274 JVMWrapper("JVM_NanoTime");
275 return os::javaTimeNanos();
276 JVM_END
277
278 // The function below is actually exposed by jdk.internal.misc.VM and not
279 // java.lang.System, but we choose to keep it here so that it stays next
280 // to JVM_CurrentTimeMillis and JVM_NanoTime
281
282 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
283 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
284
285 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
286 JVMWrapper("JVM_GetNanoTimeAdjustment");
287 jlong seconds;
288 jlong nanos;
289
290 os::javaTimeSystemUTC(seconds, nanos);
291
292 // We're going to verify that the result can fit in a long.
293 // For that we need the difference in seconds between 'seconds'
294 // and 'offset_secs' to be such that:
295 // |seconds - offset_secs| < (2^63/10^9)
296 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
297 // which makes |seconds - offset_secs| < 2^33
298 // and we will prefer +/- 2^32 as the maximum acceptable diff
299 // as 2^32 has a more natural feel than 2^33...
300 //
301 // So if |seconds - offset_secs| >= 2^32 - we return a special
302 // sentinel value (-1) which the caller should take as an
303 // exception value indicating that the offset given to us is
304 // too far from range of the current time - leading to too big
305 // a nano adjustment. The caller is expected to recover by
306 // computing a more accurate offset and calling this method
307 // again. (For the record 2^32 secs is ~136 years, so that
308 // should rarely happen)
309 //
310 jlong diff = seconds - offset_secs;
311 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
312 return -1; // sentinel value: the offset is too far off the target
313 }
314
315 // return the adjustment. If you compute a time by adding
316 // this number of nanoseconds along with the number of seconds
317 // in the offset you should get the current UTC time.
318 return (diff * (jlong)1000000000) + nanos;
319 JVM_END
320
321 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
322 jobject dst, jint dst_pos, jint length))
323 JVMWrapper("JVM_ArrayCopy");
324 // Check if we have null pointers
325 if (src == NULL || dst == NULL) {
326 THROW(vmSymbols::java_lang_NullPointerException());
327 }
328 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
329 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
330 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
331 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
332 // Do copy
333 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
334 JVM_END
335
336
337 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
338 JavaValue r(T_OBJECT);
339 // public synchronized Object put(Object key, Object value);
340 HandleMark hm(THREAD);
341 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
342 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
343 JavaCalls::call_virtual(&r,
344 props,
345 SystemDictionary::Properties_klass(),
346 vmSymbols::put_name(),
347 vmSymbols::object_object_object_signature(),
348 key_str,
349 value_str,
350 THREAD);
351 }
352
353
354 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
355
356
357 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
358 JVMWrapper("JVM_InitProperties");
359 ResourceMark rm;
360
361 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
362
363 // System property list includes both user set via -D option and
364 // jvm system specific properties.
365 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
366 PUTPROP(props, p->key(), p->value());
367 }
368
369 // Convert the -XX:MaxDirectMemorySize= command line flag
370 // to the sun.nio.MaxDirectMemorySize property.
371 // Do this after setting user properties to prevent people
372 // from setting the value with a -D option, as requested.
373 {
374 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
375 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
376 } else {
377 char as_chars[256];
378 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
379 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
380 }
381 }
382
383 // JVM monitoring and management support
384 // Add the sun.management.compiler property for the compiler's name
385 {
386 #undef CSIZE
387 #if defined(_LP64) || defined(_WIN64)
388 #define CSIZE "64-Bit "
389 #else
390 #define CSIZE
391 #endif // 64bit
392
393 #ifdef TIERED
394 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
395 #else
396 #if defined(COMPILER1)
397 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
398 #elif defined(COMPILER2)
399 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
400 #elif INCLUDE_JVMCI
401 #error "INCLUDE_JVMCI should imply TIERED"
402 #else
403 const char* compiler_name = "";
404 #endif // compilers
405 #endif // TIERED
406
407 if (*compiler_name != '\0' &&
408 (Arguments::mode() != Arguments::_int)) {
409 PUTPROP(props, "sun.management.compiler", compiler_name);
410 }
411 }
412
413 return properties;
414 JVM_END
415
416
417 /*
418 * Return the temporary directory that the VM uses for the attach
419 * and perf data files.
420 *
421 * It is important that this directory is well-known and the
422 * same for all VM instances. It cannot be affected by configuration
423 * variables such as java.io.tmpdir.
424 */
425 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
426 JVMWrapper("JVM_GetTemporaryDirectory");
427 HandleMark hm(THREAD);
428 const char* temp_dir = os::get_temp_directory();
429 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
430 return (jstring) JNIHandles::make_local(env, h());
431 JVM_END
432
433
434 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
435
436 extern volatile jint vm_created;
437
438 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
439 before_exit(thread);
440 vm_exit(code);
441 JVM_END
442
443
444 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
445 JVMWrapper("JVM_GC");
446 if (!DisableExplicitGC) {
447 Universe::heap()->collect(GCCause::_java_lang_system_gc);
448 }
449 JVM_END
450
451
452 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
453 JVMWrapper("JVM_MaxObjectInspectionAge");
454 return Universe::heap()->millis_since_last_gc();
455 JVM_END
456
457
458 static inline jlong convert_size_t_to_jlong(size_t val) {
459 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
460 NOT_LP64 (return (jlong)val;)
461 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
462 }
463
464 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
465 JVMWrapper("JVM_TotalMemory");
466 size_t n = Universe::heap()->capacity();
467 return convert_size_t_to_jlong(n);
468 JVM_END
469
470
471 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
472 JVMWrapper("JVM_FreeMemory");
473 CollectedHeap* ch = Universe::heap();
474 size_t n;
475 {
476 MutexLocker x(Heap_lock);
477 n = ch->capacity() - ch->used();
478 }
479 return convert_size_t_to_jlong(n);
480 JVM_END
481
482
483 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
484 JVMWrapper("JVM_MaxMemory");
485 size_t n = Universe::heap()->max_capacity();
486 return convert_size_t_to_jlong(n);
487 JVM_END
488
489
490 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
491 JVMWrapper("JVM_ActiveProcessorCount");
492 return os::active_processor_count();
493 JVM_END
494
495
496
497 // java.lang.Throwable //////////////////////////////////////////////////////
498
499
500 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
501 JVMWrapper("JVM_FillInStackTrace");
502 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
503 java_lang_Throwable::fill_in_stack_trace(exception);
504 JVM_END
505
506
507 // java.lang.StackTraceElement //////////////////////////////////////////////
508
509
510 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
511 JVMWrapper("JVM_InitStackTraceElementArray");
512 Handle exception(THREAD, JNIHandles::resolve(throwable));
513 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
514 objArrayHandle stack_trace(THREAD, st);
515 // Fill in the allocated stack trace
516 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
517 JVM_END
518
519
520 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
521 JVMWrapper("JVM_InitStackTraceElement");
522 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
523 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
524 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
525 JVM_END
526
527
528 // java.lang.StackWalker //////////////////////////////////////////////////////
529
530
531 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
532 jint skip_frames, jint frame_count, jint start_index,
533 jobjectArray frames))
534 JVMWrapper("JVM_CallStackWalk");
535 JavaThread* jt = (JavaThread*) THREAD;
536 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
537 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
538 }
539
540 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
541
542 // frames array is a Class<?>[] array when only getting caller reference,
543 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
544 // be null.
545 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
546 objArrayHandle frames_array_h(THREAD, fa);
547
548 int limit = start_index + frame_count;
549 if (frames_array_h->length() < limit) {
550 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
551 }
552
553 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
554 start_index, frames_array_h, CHECK_NULL);
555 return JNIHandles::make_local(env, result);
556 JVM_END
557
558
559 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
560 jint frame_count, jint start_index,
561 jobjectArray frames))
562 JVMWrapper("JVM_MoreStackWalk");
563 JavaThread* jt = (JavaThread*) THREAD;
564
565 // frames array is a Class<?>[] array when only getting caller reference,
566 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
567 // be null.
568 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
569 objArrayHandle frames_array_h(THREAD, fa);
570
571 int limit = start_index+frame_count;
572 if (frames_array_h->length() < limit) {
573 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
574 }
575
576 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
577 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
578 start_index, frames_array_h, THREAD);
579 JVM_END
580
581 // java.lang.Object ///////////////////////////////////////////////
582
583
584 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
585 JVMWrapper("JVM_IHashCode");
586 // as implemented in the classic virtual machine; return 0 if object is NULL
587 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
588 JVM_END
589
590
591 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
592 JVMWrapper("JVM_MonitorWait");
593 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
594 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
595 if (JvmtiExport::should_post_monitor_wait()) {
596 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
597
598 // The current thread already owns the monitor and it has not yet
599 // been added to the wait queue so the current thread cannot be
600 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
601 // event handler cannot accidentally consume an unpark() meant for
602 // the ParkEvent associated with this ObjectMonitor.
603 }
604 ObjectSynchronizer::wait(obj, ms, CHECK);
605 JVM_END
606
607
608 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
609 JVMWrapper("JVM_MonitorNotify");
610 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
611 ObjectSynchronizer::notify(obj, CHECK);
612 JVM_END
613
614
615 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
616 JVMWrapper("JVM_MonitorNotifyAll");
617 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
618 ObjectSynchronizer::notifyall(obj, CHECK);
619 JVM_END
620
621
622 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
623 JVMWrapper("JVM_Clone");
624 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
625 Klass* klass = obj->klass();
626 JvmtiVMObjectAllocEventCollector oam;
627
628 #ifdef ASSERT
629 // Just checking that the cloneable flag is set correct
630 if (obj->is_array()) {
631 guarantee(klass->is_cloneable(), "all arrays are cloneable");
632 } else {
633 guarantee(obj->is_instance(), "should be instanceOop");
634 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
635 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
636 }
637 #endif
638
639 // Check if class of obj supports the Cloneable interface.
640 // All arrays are considered to be cloneable (See JLS 20.1.5)
641 if (!klass->is_cloneable()) {
642 ResourceMark rm(THREAD);
643 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
644 }
645
646 // Make shallow object copy
647 const int size = obj->size();
648 oop new_obj_oop = NULL;
649 if (obj->is_array()) {
650 const int length = ((arrayOop)obj())->length();
651 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
652 } else {
653 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
654 }
655
656 HeapAccess<>::clone(obj(), new_obj_oop, size);
657
658 Handle new_obj(THREAD, new_obj_oop);
659 // Caution: this involves a java upcall, so the clone should be
660 // "gc-robust" by this stage.
661 if (klass->has_finalizer()) {
662 assert(obj->is_instance(), "should be instanceOop");
663 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
664 new_obj = Handle(THREAD, new_obj_oop);
665 }
666
667 return JNIHandles::make_local(env, new_obj());
668 JVM_END
669
670 // java.io.File ///////////////////////////////////////////////////////////////
671
672 JVM_LEAF(char*, JVM_NativePath(char* path))
673 JVMWrapper("JVM_NativePath");
674 return os::native_path(path);
675 JVM_END
676
677
678 // Misc. class handling ///////////////////////////////////////////////////////////
679
680
681 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
682 JVMWrapper("JVM_GetCallerClass");
683
684 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
685 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
686 // temporarily for existing code to use until a replacement API is defined.
687 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
688 Klass* k = thread->security_get_caller_class(depth);
689 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
690 }
691
692 // Getting the class of the caller frame.
693 //
694 // The call stack at this point looks something like this:
695 //
696 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
697 // [1] [ @CallerSensitive API.method ]
698 // [.] [ (skipped intermediate frames) ]
699 // [n] [ caller ]
700 vframeStream vfst(thread);
701 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
702 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
703 Method* m = vfst.method();
704 assert(m != NULL, "sanity");
705 switch (n) {
706 case 0:
707 // This must only be called from Reflection.getCallerClass
708 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
709 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
710 }
711 // fall-through
712 case 1:
713 // Frame 0 and 1 must be caller sensitive.
714 if (!m->caller_sensitive()) {
715 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
716 }
717 break;
718 default:
719 if (!m->is_ignored_by_security_stack_walk()) {
720 // We have reached the desired frame; return the holder class.
721 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
722 }
723 break;
724 }
725 }
726 return NULL;
727 JVM_END
728
729
730 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
731 JVMWrapper("JVM_FindPrimitiveClass");
732 oop mirror = NULL;
733 BasicType t = name2type(utf);
734 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
735 mirror = Universe::java_mirror(t);
736 }
737 if (mirror == NULL) {
738 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
739 } else {
740 return (jclass) JNIHandles::make_local(env, mirror);
741 }
742 JVM_END
743
744
745 // Returns a class loaded by the bootstrap class loader; or null
746 // if not found. ClassNotFoundException is not thrown.
747 // FindClassFromBootLoader is exported to the launcher for windows.
748 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
749 const char* name))
750 JVMWrapper("JVM_FindClassFromBootLoader");
751
752 // Java libraries should ensure that name is never null...
753 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
754 // It's impossible to create this class; the name cannot fit
755 // into the constant pool.
756 return NULL;
757 }
758
759 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
760 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
761 if (k == NULL) {
762 return NULL;
763 }
764
765 if (log_is_enabled(Debug, class, resolve)) {
766 trace_class_resolution(k);
767 }
768 return (jclass) JNIHandles::make_local(env, k->java_mirror());
769 JVM_END
770
771 // Find a class with this name in this loader, using the caller's protection domain.
772 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
773 jboolean init, jobject loader,
774 jclass caller))
775 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
776 // Java libraries should ensure that name is never null...
777 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
778 // It's impossible to create this class; the name cannot fit
779 // into the constant pool.
780 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
781 }
782
783 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
784
785 oop loader_oop = JNIHandles::resolve(loader);
786 oop from_class = JNIHandles::resolve(caller);
787 oop protection_domain = NULL;
788 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
789 // NPE. Put it in another way, the bootstrap class loader has all permission and
790 // thus no checkPackageAccess equivalence in the VM class loader.
791 // The caller is also passed as NULL by the java code if there is no security
792 // manager to avoid the performance cost of getting the calling class.
793 if (from_class != NULL && loader_oop != NULL) {
794 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
795 }
796
797 Handle h_loader(THREAD, loader_oop);
798 Handle h_prot(THREAD, protection_domain);
799 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
800 h_prot, false, THREAD);
801
802 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
803 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
804 }
805 return result;
806 JVM_END
807
808 // Currently only called from the old verifier.
809 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
810 jboolean init, jclass from))
811 JVMWrapper("JVM_FindClassFromClass");
812 if (name == NULL) {
813 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
814 }
815 if ((int)strlen(name) > Symbol::max_length()) {
816 // It's impossible to create this class; the name cannot fit
817 // into the constant pool.
818 Exceptions::fthrow(THREAD_AND_LOCATION,
819 vmSymbols::java_lang_NoClassDefFoundError(),
820 "Class name exceeds maximum length of %d: %s",
821 Symbol::max_length(),
822 name);
823 return 0;
824 }
825 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
826 oop from_class_oop = JNIHandles::resolve(from);
827 Klass* from_class = (from_class_oop == NULL)
828 ? (Klass*)NULL
829 : java_lang_Class::as_Klass(from_class_oop);
830 oop class_loader = NULL;
831 oop protection_domain = NULL;
832 if (from_class != NULL) {
833 class_loader = from_class->class_loader();
834 protection_domain = from_class->protection_domain();
835 }
836 Handle h_loader(THREAD, class_loader);
837 Handle h_prot (THREAD, protection_domain);
838 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
839 h_prot, true, thread);
840
841 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
842 // this function is generally only used for class loading during verification.
843 ResourceMark rm;
844 oop from_mirror = JNIHandles::resolve_non_null(from);
845 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
846 const char * from_name = from_class->external_name();
847
848 oop mirror = JNIHandles::resolve_non_null(result);
849 Klass* to_class = java_lang_Class::as_Klass(mirror);
850 const char * to = to_class->external_name();
851 log_debug(class, resolve)("%s %s (verification)", from_name, to);
852 }
853
854 return result;
855 JVM_END
856
857 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
858 if (loader.is_null()) {
859 return;
860 }
861
862 // check whether the current caller thread holds the lock or not.
863 // If not, increment the corresponding counter
864 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
865 ObjectSynchronizer::owner_self) {
866 counter->inc();
867 }
868 }
869
870 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
871 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
872 jobject loader, const jbyte *buf,
873 jsize len, jobject pd, const char *source,
874 TRAPS) {
875 if (source == NULL) source = "__JVM_DefineClass__";
876
877 assert(THREAD->is_Java_thread(), "must be a JavaThread");
878 JavaThread* jt = (JavaThread*) THREAD;
879
880 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
881 ClassLoader::perf_define_appclass_selftime(),
882 ClassLoader::perf_define_appclasses(),
883 jt->get_thread_stat()->perf_recursion_counts_addr(),
884 jt->get_thread_stat()->perf_timers_addr(),
885 PerfClassTraceTime::DEFINE_CLASS);
886
887 if (UsePerfData) {
888 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
889 }
890
891 // Since exceptions can be thrown, class initialization can take place
892 // if name is NULL no check for class name in .class stream has to be made.
893 TempNewSymbol class_name = NULL;
894 if (name != NULL) {
895 const int str_len = (int)strlen(name);
896 if (str_len > Symbol::max_length()) {
897 // It's impossible to create this class; the name cannot fit
898 // into the constant pool.
899 Exceptions::fthrow(THREAD_AND_LOCATION,
900 vmSymbols::java_lang_NoClassDefFoundError(),
901 "Class name exceeds maximum length of %d: %s",
902 Symbol::max_length(),
903 name);
904 return 0;
905 }
906 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
907 }
908
909 ResourceMark rm(THREAD);
910 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
911 Handle class_loader (THREAD, JNIHandles::resolve(loader));
912 if (UsePerfData) {
913 is_lock_held_by_thread(class_loader,
914 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
915 THREAD);
916 }
917 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
918 Klass* k = SystemDictionary::resolve_from_stream(class_name,
919 class_loader,
920 protection_domain,
921 &st,
922 CHECK_NULL);
923
924 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
925 trace_class_resolution(k);
926 }
927
928 return (jclass) JNIHandles::make_local(env, k->java_mirror());
929 }
930
931
932 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
933 JVMWrapper("JVM_DefineClass");
934
935 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
936 JVM_END
937
938
939 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
940 JVMWrapper("JVM_DefineClassWithSource");
941
942 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
943 JVM_END
944
945 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
946 JVMWrapper("JVM_FindLoadedClass");
947 ResourceMark rm(THREAD);
948
949 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
950 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
951
952 const char* str = java_lang_String::as_utf8_string(string());
953 // Sanity check, don't expect null
954 if (str == NULL) return NULL;
955
956 const int str_len = (int)strlen(str);
957 if (str_len > Symbol::max_length()) {
958 // It's impossible to create this class; the name cannot fit
959 // into the constant pool.
960 return NULL;
961 }
962 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
963
964 // Security Note:
965 // The Java level wrapper will perform the necessary security check allowing
966 // us to pass the NULL as the initiating class loader.
967 Handle h_loader(THREAD, JNIHandles::resolve(loader));
968 if (UsePerfData) {
969 is_lock_held_by_thread(h_loader,
970 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
971 THREAD);
972 }
973
974 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
975 h_loader,
976 Handle(),
977 CHECK_NULL);
978 #if INCLUDE_CDS
979 if (k == NULL) {
980 // If the class is not already loaded, try to see if it's in the shared
981 // archive for the current classloader (h_loader).
982 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
983 }
984 #endif
985 return (k == NULL) ? NULL :
986 (jclass) JNIHandles::make_local(env, k->java_mirror());
987 JVM_END
988
989 // Module support //////////////////////////////////////////////////////////////////////////////
990
991 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
992 jstring location, const char* const* packages, jsize num_packages))
993 JVMWrapper("JVM_DefineModule");
994 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
995 JVM_END
996
997 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
998 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
999 Modules::set_bootloader_unnamed_module(module, CHECK);
1000 JVM_END
1001
1002 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1003 JVMWrapper("JVM_AddModuleExports");
1004 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1005 JVM_END
1006
1007 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1008 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1009 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1010 JVM_END
1011
1012 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1013 JVMWrapper("JVM_AddModuleExportsToAll");
1014 Modules::add_module_exports(from_module, package, NULL, CHECK);
1015 JVM_END
1016
1017 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1018 JVMWrapper("JVM_AddReadsModule");
1019 Modules::add_reads_module(from_module, source_module, CHECK);
1020 JVM_END
1021
1022 // Reflection support //////////////////////////////////////////////////////////////////////////////
1023
1024 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1025 assert (cls != NULL, "illegal class");
1026 JVMWrapper("JVM_GetClassName");
1027 JvmtiVMObjectAllocEventCollector oam;
1028 ResourceMark rm(THREAD);
1029 const char* name;
1030 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1031 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1032 } else {
1033 // Consider caching interned string in Klass
1034 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1035 assert(k->is_klass(), "just checking");
1036 name = k->external_name();
1037 }
1038 oop result = StringTable::intern((char*) name, CHECK_NULL);
1039 return (jstring) JNIHandles::make_local(env, result);
1040 JVM_END
1041
1042
1043 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1044 JVMWrapper("JVM_GetClassInterfaces");
1045 JvmtiVMObjectAllocEventCollector oam;
1046 oop mirror = JNIHandles::resolve_non_null(cls);
1047
1048 // Special handling for primitive objects
1049 if (java_lang_Class::is_primitive(mirror)) {
1050 // Primitive objects does not have any interfaces
1051 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1052 return (jobjectArray) JNIHandles::make_local(env, r);
1053 }
1054
1055 Klass* klass = java_lang_Class::as_Klass(mirror);
1056 // Figure size of result array
1057 int size;
1058 if (klass->is_instance_klass()) {
1059 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1060 } else {
1061 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1062 size = 2;
1063 }
1064
1065 // Allocate result array
1066 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1067 objArrayHandle result (THREAD, r);
1068 // Fill in result
1069 if (klass->is_instance_klass()) {
1070 // Regular instance klass, fill in all local interfaces
1071 for (int index = 0; index < size; index++) {
1072 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1073 result->obj_at_put(index, k->java_mirror());
1074 }
1075 } else {
1076 // All arrays implement java.lang.Cloneable and java.io.Serializable
1077 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1078 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1079 }
1080 return (jobjectArray) JNIHandles::make_local(env, result());
1081 JVM_END
1082
1083
1084 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1085 JVMWrapper("JVM_IsInterface");
1086 oop mirror = JNIHandles::resolve_non_null(cls);
1087 if (java_lang_Class::is_primitive(mirror)) {
1088 return JNI_FALSE;
1089 }
1090 Klass* k = java_lang_Class::as_Klass(mirror);
1091 jboolean result = k->is_interface();
1092 assert(!result || k->is_instance_klass(),
1093 "all interfaces are instance types");
1094 // The compiler intrinsic for isInterface tests the
1095 // Klass::_access_flags bits in the same way.
1096 return result;
1097 JVM_END
1098
1099
1100 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1101 JVMWrapper("JVM_GetClassSigners");
1102 JvmtiVMObjectAllocEventCollector oam;
1103 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1104 // There are no signers for primitive types
1105 return NULL;
1106 }
1107
1108 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1109
1110 // If there are no signers set in the class, or if the class
1111 // is an array, return NULL.
1112 if (signers == NULL) return NULL;
1113
1114 // copy of the signers array
1115 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1116 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1117 for (int index = 0; index < signers->length(); index++) {
1118 signers_copy->obj_at_put(index, signers->obj_at(index));
1119 }
1120
1121 // return the copy
1122 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1123 JVM_END
1124
1125
1126 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1127 JVMWrapper("JVM_SetClassSigners");
1128 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1129 // This call is ignored for primitive types and arrays.
1130 // Signers are only set once, ClassLoader.java, and thus shouldn't
1131 // be called with an array. Only the bootstrap loader creates arrays.
1132 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1133 if (k->is_instance_klass()) {
1134 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1135 }
1136 }
1137 JVM_END
1138
1139
1140 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1141 JVMWrapper("JVM_GetProtectionDomain");
1142 if (JNIHandles::resolve(cls) == NULL) {
1143 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1144 }
1145
1146 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1147 // Primitive types does not have a protection domain.
1148 return NULL;
1149 }
1150
1151 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1152 return (jobject) JNIHandles::make_local(env, pd);
1153 JVM_END
1154
1155
1156 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) {
1157 // If there is a security manager and protection domain, check the access
1158 // in the protection domain, otherwise it is authorized.
1159 if (java_lang_System::has_security_manager()) {
1160
1161 // For bootstrapping, if pd implies method isn't in the JDK, allow
1162 // this context to revert to older behavior.
1163 // In this case the isAuthorized field in AccessControlContext is also not
1164 // present.
1165 if (Universe::protection_domain_implies_method() == NULL) {
1166 return true;
1167 }
1168
1169 // Whitelist certain access control contexts
1170 if (java_security_AccessControlContext::is_authorized(context)) {
1171 return true;
1172 }
1173
1174 oop prot = klass->protection_domain();
1175 if (prot != NULL) {
1176 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1177 // in the new wrapper.
1178 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1179 Handle h_prot(THREAD, prot);
1180 JavaValue result(T_BOOLEAN);
1181 JavaCallArguments args(h_prot);
1182 JavaCalls::call(&result, m, &args, CHECK_false);
1183 return (result.get_jboolean() != 0);
1184 }
1185 }
1186 return true;
1187 }
1188
1189 // Create an AccessControlContext with a protection domain with null codesource
1190 // and null permissions - which gives no permissions.
1191 oop create_dummy_access_control_context(TRAPS) {
1192 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1193 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1194 // Call constructor ProtectionDomain(null, null);
1195 JavaValue result(T_VOID);
1196 JavaCalls::call_special(&result, obj, pd_klass,
1197 vmSymbols::object_initializer_name(),
1198 vmSymbols::codesource_permissioncollection_signature(),
1199 Handle(), Handle(), CHECK_NULL);
1200
1201 // new ProtectionDomain[] {pd};
1202 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1203 context->obj_at_put(0, obj());
1204
1205 // new AccessControlContext(new ProtectionDomain[] {pd})
1206 objArrayHandle h_context(THREAD, context);
1207 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1208 return acc;
1209 }
1210
1211 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1212 JVMWrapper("JVM_DoPrivileged");
1213
1214 if (action == NULL) {
1215 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1216 }
1217
1218 // Compute the frame initiating the do privileged operation and setup the privileged stack
1219 vframeStream vfst(thread);
1220 vfst.security_get_caller_frame(1);
1221
1222 if (vfst.at_end()) {
1223 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1224 }
1225
1226 Method* method = vfst.method();
1227 InstanceKlass* klass = method->method_holder();
1228
1229 // Check that action object understands "Object run()"
1230 Handle h_context;
1231 if (context != NULL) {
1232 h_context = Handle(THREAD, JNIHandles::resolve(context));
1233 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1234 if (!authorized) {
1235 // Create an unprivileged access control object and call it's run function
1236 // instead.
1237 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1238 h_context = Handle(THREAD, noprivs);
1239 }
1240 }
1241
1242 // Check that action object understands "Object run()"
1243 Handle object (THREAD, JNIHandles::resolve(action));
1244
1245 // get run() method
1246 Method* m_oop = object->klass()->uncached_lookup_method(
1247 vmSymbols::run_method_name(),
1248 vmSymbols::void_object_signature(),
1249 Klass::find_overpass);
1250
1251 // See if there is a default method for "Object run()".
1252 if (m_oop == NULL && object->klass()->is_instance_klass()) {
1253 InstanceKlass* iklass = InstanceKlass::cast(object->klass());
1254 m_oop = iklass->lookup_method_in_ordered_interfaces(
1255 vmSymbols::run_method_name(),
1256 vmSymbols::void_object_signature());
1257 }
1258
1259 methodHandle m (THREAD, m_oop);
1260 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) {
1261 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1262 }
1263
1264 // Stack allocated list of privileged stack elements
1265 PrivilegedElement pi;
1266 if (!vfst.at_end()) {
1267 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1268 thread->set_privileged_stack_top(&pi);
1269 }
1270
1271
1272 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1273 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1274 Handle pending_exception;
1275 JavaValue result(T_OBJECT);
1276 JavaCallArguments args(object);
1277 JavaCalls::call(&result, m, &args, THREAD);
1278
1279 // done with action, remove ourselves from the list
1280 if (!vfst.at_end()) {
1281 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1282 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1283 }
1284
1285 if (HAS_PENDING_EXCEPTION) {
1286 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1287 CLEAR_PENDING_EXCEPTION;
1288 // JVMTI has already reported the pending exception
1289 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1290 if (THREAD->is_Java_thread()) {
1291 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1292 }
1293 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1294 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1295 // Throw a java.security.PrivilegedActionException(Exception e) exception
1296 JavaCallArguments args(pending_exception);
1297 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1298 vmSymbols::exception_void_signature(),
1299 &args);
1300 }
1301 }
1302
1303 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1304 return JNIHandles::make_local(env, (oop) result.get_jobject());
1305 JVM_END
1306
1307
1308 // Returns the inherited_access_control_context field of the running thread.
1309 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1310 JVMWrapper("JVM_GetInheritedAccessControlContext");
1311 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1312 return JNIHandles::make_local(env, result);
1313 JVM_END
1314
1315 class RegisterArrayForGC {
1316 private:
1317 JavaThread *_thread;
1318 public:
1319 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1320 _thread = thread;
1321 _thread->register_array_for_gc(array);
1322 }
1323
1324 ~RegisterArrayForGC() {
1325 _thread->register_array_for_gc(NULL);
1326 }
1327 };
1328
1329
1330 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1331 JVMWrapper("JVM_GetStackAccessControlContext");
1332 if (!UsePrivilegedStack) return NULL;
1333
1334 ResourceMark rm(THREAD);
1335 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1336 JvmtiVMObjectAllocEventCollector oam;
1337
1338 // count the protection domains on the execution stack. We collapse
1339 // duplicate consecutive protection domains into a single one, as
1340 // well as stopping when we hit a privileged frame.
1341
1342 // Use vframeStream to iterate through Java frames
1343 vframeStream vfst(thread);
1344
1345 oop previous_protection_domain = NULL;
1346 Handle privileged_context(thread, NULL);
1347 bool is_privileged = false;
1348 oop protection_domain = NULL;
1349
1350 for(; !vfst.at_end(); vfst.next()) {
1351 // get method of frame
1352 Method* method = vfst.method();
1353 intptr_t* frame_id = vfst.frame_id();
1354
1355 // check the privileged frames to see if we have a match
1356 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1357 // this frame is privileged
1358 is_privileged = true;
1359 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1360 protection_domain = thread->privileged_stack_top()->protection_domain();
1361 } else {
1362 protection_domain = method->method_holder()->protection_domain();
1363 }
1364
1365 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1366 local_array->push(protection_domain);
1367 previous_protection_domain = protection_domain;
1368 }
1369
1370 if (is_privileged) break;
1371 }
1372
1373
1374 // either all the domains on the stack were system domains, or
1375 // we had a privileged system domain
1376 if (local_array->is_empty()) {
1377 if (is_privileged && privileged_context.is_null()) return NULL;
1378
1379 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1380 return JNIHandles::make_local(env, result);
1381 }
1382
1383 // the resource area must be registered in case of a gc
1384 RegisterArrayForGC ragc(thread, local_array);
1385 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1386 local_array->length(), CHECK_NULL);
1387 objArrayHandle h_context(thread, context);
1388 for (int index = 0; index < local_array->length(); index++) {
1389 h_context->obj_at_put(index, local_array->at(index));
1390 }
1391
1392 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1393
1394 return JNIHandles::make_local(env, result);
1395 JVM_END
1396
1397
1398 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1399 JVMWrapper("JVM_IsArrayClass");
1400 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1401 return (k != NULL) && k->is_array_klass() ? true : false;
1402 JVM_END
1403
1404
1405 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1406 JVMWrapper("JVM_IsPrimitiveClass");
1407 oop mirror = JNIHandles::resolve_non_null(cls);
1408 return (jboolean) java_lang_Class::is_primitive(mirror);
1409 JVM_END
1410
1411
1412 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1413 JVMWrapper("JVM_GetClassModifiers");
1414 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1415 // Primitive type
1416 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1417 }
1418
1419 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1420 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1421 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1422 return k->modifier_flags();
1423 JVM_END
1424
1425
1426 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1427
1428 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1429 JvmtiVMObjectAllocEventCollector oam;
1430 // ofClass is a reference to a java_lang_Class object. The mirror object
1431 // of an InstanceKlass
1432
1433 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1434 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1435 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1436 return (jobjectArray)JNIHandles::make_local(env, result);
1437 }
1438
1439 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1440 InnerClassesIterator iter(k);
1441
1442 if (iter.length() == 0) {
1443 // Neither an inner nor outer class
1444 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1445 return (jobjectArray)JNIHandles::make_local(env, result);
1446 }
1447
1448 // find inner class info
1449 constantPoolHandle cp(thread, k->constants());
1450 int length = iter.length();
1451
1452 // Allocate temp. result array
1453 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1454 objArrayHandle result (THREAD, r);
1455 int members = 0;
1456
1457 for (; !iter.done(); iter.next()) {
1458 int ioff = iter.inner_class_info_index();
1459 int ooff = iter.outer_class_info_index();
1460
1461 if (ioff != 0 && ooff != 0) {
1462 // Check to see if the name matches the class we're looking for
1463 // before attempting to find the class.
1464 if (cp->klass_name_at_matches(k, ooff)) {
1465 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1466 if (outer_klass == k) {
1467 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1468 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1469
1470 // Throws an exception if outer klass has not declared k as
1471 // an inner klass
1472 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1473
1474 result->obj_at_put(members, inner_klass->java_mirror());
1475 members++;
1476 }
1477 }
1478 }
1479 }
1480
1481 if (members != length) {
1482 // Return array of right length
1483 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1484 for(int i = 0; i < members; i++) {
1485 res->obj_at_put(i, result->obj_at(i));
1486 }
1487 return (jobjectArray)JNIHandles::make_local(env, res);
1488 }
1489
1490 return (jobjectArray)JNIHandles::make_local(env, result());
1491 JVM_END
1492
1493
1494 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1495 {
1496 // ofClass is a reference to a java_lang_Class object.
1497 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1498 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1499 return NULL;
1500 }
1501
1502 bool inner_is_member = false;
1503 Klass* outer_klass
1504 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1505 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1506 if (outer_klass == NULL) return NULL; // already a top-level class
1507 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1508 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1509 }
1510 JVM_END
1511
1512 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1513 {
1514 oop mirror = JNIHandles::resolve_non_null(cls);
1515 if (java_lang_Class::is_primitive(mirror) ||
1516 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1517 return NULL;
1518 }
1519 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1520 int ooff = 0, noff = 0;
1521 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1522 if (noff != 0) {
1523 constantPoolHandle i_cp(thread, k->constants());
1524 Symbol* name = i_cp->symbol_at(noff);
1525 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1526 return (jstring) JNIHandles::make_local(env, str());
1527 }
1528 }
1529 return NULL;
1530 }
1531 JVM_END
1532
1533 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1534 assert (cls != NULL, "illegal class");
1535 JVMWrapper("JVM_GetClassSignature");
1536 JvmtiVMObjectAllocEventCollector oam;
1537 ResourceMark rm(THREAD);
1538 // Return null for arrays and primatives
1539 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1540 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1541 if (k->is_instance_klass()) {
1542 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1543 if (sym == NULL) return NULL;
1544 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1545 return (jstring) JNIHandles::make_local(env, str());
1546 }
1547 }
1548 return NULL;
1549 JVM_END
1550
1551
1552 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1553 assert (cls != NULL, "illegal class");
1554 JVMWrapper("JVM_GetClassAnnotations");
1555
1556 // Return null for arrays and primitives
1557 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1558 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1559 if (k->is_instance_klass()) {
1560 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1561 return (jbyteArray) JNIHandles::make_local(env, a);
1562 }
1563 }
1564 return NULL;
1565 JVM_END
1566
1567
1568 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1569 // some of this code was adapted from from jni_FromReflectedField
1570
1571 oop reflected = JNIHandles::resolve_non_null(field);
1572 oop mirror = java_lang_reflect_Field::clazz(reflected);
1573 Klass* k = java_lang_Class::as_Klass(mirror);
1574 int slot = java_lang_reflect_Field::slot(reflected);
1575 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1576
1577 InstanceKlass* ik = InstanceKlass::cast(k);
1578 intptr_t offset = ik->field_offset(slot);
1579
1580 if (modifiers & JVM_ACC_STATIC) {
1581 // for static fields we only look in the current class
1582 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1583 assert(false, "cannot find static field");
1584 return false;
1585 }
1586 } else {
1587 // for instance fields we start with the current class and work
1588 // our way up through the superclass chain
1589 if (!ik->find_field_from_offset(offset, false, &fd)) {
1590 assert(false, "cannot find instance field");
1591 return false;
1592 }
1593 }
1594 return true;
1595 }
1596
1597 static Method* jvm_get_method_common(jobject method) {
1598 // some of this code was adapted from from jni_FromReflectedMethod
1599
1600 oop reflected = JNIHandles::resolve_non_null(method);
1601 oop mirror = NULL;
1602 int slot = 0;
1603
1604 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1605 mirror = java_lang_reflect_Constructor::clazz(reflected);
1606 slot = java_lang_reflect_Constructor::slot(reflected);
1607 } else {
1608 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1609 "wrong type");
1610 mirror = java_lang_reflect_Method::clazz(reflected);
1611 slot = java_lang_reflect_Method::slot(reflected);
1612 }
1613 Klass* k = java_lang_Class::as_Klass(mirror);
1614
1615 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1616 assert(m != NULL, "cannot find method");
1617 return m; // caller has to deal with NULL in product mode
1618 }
1619
1620 /* Type use annotations support (JDK 1.8) */
1621
1622 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1623 assert (cls != NULL, "illegal class");
1624 JVMWrapper("JVM_GetClassTypeAnnotations");
1625 ResourceMark rm(THREAD);
1626 // Return null for arrays and primitives
1627 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1628 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1629 if (k->is_instance_klass()) {
1630 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1631 if (type_annotations != NULL) {
1632 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1633 return (jbyteArray) JNIHandles::make_local(env, a);
1634 }
1635 }
1636 }
1637 return NULL;
1638 JVM_END
1639
1640 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1641 assert (method != NULL, "illegal method");
1642 JVMWrapper("JVM_GetMethodTypeAnnotations");
1643
1644 // method is a handle to a java.lang.reflect.Method object
1645 Method* m = jvm_get_method_common(method);
1646 if (m == NULL) {
1647 return NULL;
1648 }
1649
1650 AnnotationArray* type_annotations = m->type_annotations();
1651 if (type_annotations != NULL) {
1652 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1653 return (jbyteArray) JNIHandles::make_local(env, a);
1654 }
1655
1656 return NULL;
1657 JVM_END
1658
1659 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1660 assert (field != NULL, "illegal field");
1661 JVMWrapper("JVM_GetFieldTypeAnnotations");
1662
1663 fieldDescriptor fd;
1664 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1665 if (!gotFd) {
1666 return NULL;
1667 }
1668
1669 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1670 JVM_END
1671
1672 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1673 if (!cp->is_within_bounds(index)) {
1674 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1675 }
1676 }
1677
1678 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1679 {
1680 JVMWrapper("JVM_GetMethodParameters");
1681 // method is a handle to a java.lang.reflect.Method object
1682 Method* method_ptr = jvm_get_method_common(method);
1683 methodHandle mh (THREAD, method_ptr);
1684 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1685 const int num_params = mh->method_parameters_length();
1686
1687 if (num_params < 0) {
1688 // A -1 return value from method_parameters_length means there is no
1689 // parameter data. Return null to indicate this to the reflection
1690 // API.
1691 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1692 return (jobjectArray)NULL;
1693 } else {
1694 // Otherwise, we return something up to reflection, even if it is
1695 // a zero-length array. Why? Because in some cases this can
1696 // trigger a MalformedParametersException.
1697
1698 // make sure all the symbols are properly formatted
1699 for (int i = 0; i < num_params; i++) {
1700 MethodParametersElement* params = mh->method_parameters_start();
1701 int index = params[i].name_cp_index;
1702 bounds_check(mh->constants(), index, CHECK_NULL);
1703
1704 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1705 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1706 "Wrong type at constant pool index");
1707 }
1708
1709 }
1710
1711 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1712 objArrayHandle result (THREAD, result_oop);
1713
1714 for (int i = 0; i < num_params; i++) {
1715 MethodParametersElement* params = mh->method_parameters_start();
1716 // For a 0 index, give a NULL symbol
1717 Symbol* sym = 0 != params[i].name_cp_index ?
1718 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1719 int flags = params[i].flags;
1720 oop param = Reflection::new_parameter(reflected_method, i, sym,
1721 flags, CHECK_NULL);
1722 result->obj_at_put(i, param);
1723 }
1724 return (jobjectArray)JNIHandles::make_local(env, result());
1725 }
1726 }
1727 JVM_END
1728
1729 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1730
1731 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1732 {
1733 JVMWrapper("JVM_GetClassDeclaredFields");
1734 JvmtiVMObjectAllocEventCollector oam;
1735
1736 // Exclude primitive types and array types
1737 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1738 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1739 // Return empty array
1740 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1741 return (jobjectArray) JNIHandles::make_local(env, res);
1742 }
1743
1744 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1745 constantPoolHandle cp(THREAD, k->constants());
1746
1747 // Ensure class is linked
1748 k->link_class(CHECK_NULL);
1749
1750 // Allocate result
1751 int num_fields;
1752
1753 if (publicOnly) {
1754 num_fields = 0;
1755 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1756 if (fs.access_flags().is_public()) ++num_fields;
1757 }
1758 } else {
1759 num_fields = k->java_fields_count();
1760 }
1761
1762 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1763 objArrayHandle result (THREAD, r);
1764
1765 int out_idx = 0;
1766 fieldDescriptor fd;
1767 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1768 if (!publicOnly || fs.access_flags().is_public()) {
1769 fd.reinitialize(k, fs.index());
1770 oop field = Reflection::new_field(&fd, CHECK_NULL);
1771 result->obj_at_put(out_idx, field);
1772 ++out_idx;
1773 }
1774 }
1775 assert(out_idx == num_fields, "just checking");
1776 return (jobjectArray) JNIHandles::make_local(env, result());
1777 }
1778 JVM_END
1779
1780 static bool select_method(const methodHandle& method, bool want_constructor) {
1781 if (want_constructor) {
1782 return (method->is_initializer() && !method->is_static());
1783 } else {
1784 return (!method->is_initializer() && !method->is_overpass());
1785 }
1786 }
1787
1788 static jobjectArray get_class_declared_methods_helper(
1789 JNIEnv *env,
1790 jclass ofClass, jboolean publicOnly,
1791 bool want_constructor,
1792 Klass* klass, TRAPS) {
1793
1794 JvmtiVMObjectAllocEventCollector oam;
1795
1796 // Exclude primitive types and array types
1797 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1798 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1799 // Return empty array
1800 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1801 return (jobjectArray) JNIHandles::make_local(env, res);
1802 }
1803
1804 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1805
1806 // Ensure class is linked
1807 k->link_class(CHECK_NULL);
1808
1809 Array<Method*>* methods = k->methods();
1810 int methods_length = methods->length();
1811
1812 // Save original method_idnum in case of redefinition, which can change
1813 // the idnum of obsolete methods. The new method will have the same idnum
1814 // but if we refresh the methods array, the counts will be wrong.
1815 ResourceMark rm(THREAD);
1816 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1817 int num_methods = 0;
1818
1819 for (int i = 0; i < methods_length; i++) {
1820 methodHandle method(THREAD, methods->at(i));
1821 if (select_method(method, want_constructor)) {
1822 if (!publicOnly || method->is_public()) {
1823 idnums->push(method->method_idnum());
1824 ++num_methods;
1825 }
1826 }
1827 }
1828
1829 // Allocate result
1830 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1831 objArrayHandle result (THREAD, r);
1832
1833 // Now just put the methods that we selected above, but go by their idnum
1834 // in case of redefinition. The methods can be redefined at any safepoint,
1835 // so above when allocating the oop array and below when creating reflect
1836 // objects.
1837 for (int i = 0; i < num_methods; i++) {
1838 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1839 if (method.is_null()) {
1840 // Method may have been deleted and seems this API can handle null
1841 // Otherwise should probably put a method that throws NSME
1842 result->obj_at_put(i, NULL);
1843 } else {
1844 oop m;
1845 if (want_constructor) {
1846 m = Reflection::new_constructor(method, CHECK_NULL);
1847 } else {
1848 m = Reflection::new_method(method, false, CHECK_NULL);
1849 }
1850 result->obj_at_put(i, m);
1851 }
1852 }
1853
1854 return (jobjectArray) JNIHandles::make_local(env, result());
1855 }
1856
1857 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1858 {
1859 JVMWrapper("JVM_GetClassDeclaredMethods");
1860 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1861 /*want_constructor*/ false,
1862 SystemDictionary::reflect_Method_klass(), THREAD);
1863 }
1864 JVM_END
1865
1866 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1867 {
1868 JVMWrapper("JVM_GetClassDeclaredConstructors");
1869 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1870 /*want_constructor*/ true,
1871 SystemDictionary::reflect_Constructor_klass(), THREAD);
1872 }
1873 JVM_END
1874
1875 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1876 {
1877 JVMWrapper("JVM_GetClassAccessFlags");
1878 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1879 // Primitive type
1880 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1881 }
1882
1883 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1884 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1885 }
1886 JVM_END
1887
1888
1889 // Constant pool access //////////////////////////////////////////////////////////
1890
1891 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1892 {
1893 JVMWrapper("JVM_GetClassConstantPool");
1894 JvmtiVMObjectAllocEventCollector oam;
1895
1896 // Return null for primitives and arrays
1897 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1898 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1899 if (k->is_instance_klass()) {
1900 InstanceKlass* k_h = InstanceKlass::cast(k);
1901 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1902 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1903 return JNIHandles::make_local(jcp());
1904 }
1905 }
1906 return NULL;
1907 }
1908 JVM_END
1909
1910
1911 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1912 {
1913 JVMWrapper("JVM_ConstantPoolGetSize");
1914 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1915 return cp->length();
1916 }
1917 JVM_END
1918
1919
1920 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1921 {
1922 JVMWrapper("JVM_ConstantPoolGetClassAt");
1923 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1924 bounds_check(cp, index, CHECK_NULL);
1925 constantTag tag = cp->tag_at(index);
1926 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1927 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1928 }
1929 Klass* k = cp->klass_at(index, CHECK_NULL);
1930 return (jclass) JNIHandles::make_local(k->java_mirror());
1931 }
1932 JVM_END
1933
1934 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1935 {
1936 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1937 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1938 bounds_check(cp, index, CHECK_NULL);
1939 constantTag tag = cp->tag_at(index);
1940 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1941 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1942 }
1943 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1944 if (k == NULL) return NULL;
1945 return (jclass) JNIHandles::make_local(k->java_mirror());
1946 }
1947 JVM_END
1948
1949 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1950 constantTag tag = cp->tag_at(index);
1951 if (!tag.is_method() && !tag.is_interface_method()) {
1952 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1953 }
1954 int klass_ref = cp->uncached_klass_ref_index_at(index);
1955 Klass* k_o;
1956 if (force_resolution) {
1957 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1958 } else {
1959 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1960 if (k_o == NULL) return NULL;
1961 }
1962 InstanceKlass* k = InstanceKlass::cast(k_o);
1963 Symbol* name = cp->uncached_name_ref_at(index);
1964 Symbol* sig = cp->uncached_signature_ref_at(index);
1965 methodHandle m (THREAD, k->find_method(name, sig));
1966 if (m.is_null()) {
1967 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1968 }
1969 oop method;
1970 if (!m->is_initializer() || m->is_static()) {
1971 method = Reflection::new_method(m, true, CHECK_NULL);
1972 } else {
1973 method = Reflection::new_constructor(m, CHECK_NULL);
1974 }
1975 return JNIHandles::make_local(method);
1976 }
1977
1978 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1979 {
1980 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1981 JvmtiVMObjectAllocEventCollector oam;
1982 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1983 bounds_check(cp, index, CHECK_NULL);
1984 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1985 return res;
1986 }
1987 JVM_END
1988
1989 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1990 {
1991 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1992 JvmtiVMObjectAllocEventCollector oam;
1993 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1994 bounds_check(cp, index, CHECK_NULL);
1995 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1996 return res;
1997 }
1998 JVM_END
1999
2000 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2001 constantTag tag = cp->tag_at(index);
2002 if (!tag.is_field()) {
2003 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2004 }
2005 int klass_ref = cp->uncached_klass_ref_index_at(index);
2006 Klass* k_o;
2007 if (force_resolution) {
2008 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2009 } else {
2010 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2011 if (k_o == NULL) return NULL;
2012 }
2013 InstanceKlass* k = InstanceKlass::cast(k_o);
2014 Symbol* name = cp->uncached_name_ref_at(index);
2015 Symbol* sig = cp->uncached_signature_ref_at(index);
2016 fieldDescriptor fd;
2017 Klass* target_klass = k->find_field(name, sig, &fd);
2018 if (target_klass == NULL) {
2019 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2020 }
2021 oop field = Reflection::new_field(&fd, CHECK_NULL);
2022 return JNIHandles::make_local(field);
2023 }
2024
2025 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2026 {
2027 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2028 JvmtiVMObjectAllocEventCollector oam;
2029 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2030 bounds_check(cp, index, CHECK_NULL);
2031 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2032 return res;
2033 }
2034 JVM_END
2035
2036 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2037 {
2038 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2039 JvmtiVMObjectAllocEventCollector oam;
2040 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2041 bounds_check(cp, index, CHECK_NULL);
2042 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2043 return res;
2044 }
2045 JVM_END
2046
2047 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2048 {
2049 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2050 JvmtiVMObjectAllocEventCollector oam;
2051 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2052 bounds_check(cp, index, CHECK_NULL);
2053 constantTag tag = cp->tag_at(index);
2054 if (!tag.is_field_or_method()) {
2055 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2056 }
2057 int klass_ref = cp->uncached_klass_ref_index_at(index);
2058 Symbol* klass_name = cp->klass_name_at(klass_ref);
2059 Symbol* member_name = cp->uncached_name_ref_at(index);
2060 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2061 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2062 objArrayHandle dest(THREAD, dest_o);
2063 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2064 dest->obj_at_put(0, str());
2065 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2066 dest->obj_at_put(1, str());
2067 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2068 dest->obj_at_put(2, str());
2069 return (jobjectArray) JNIHandles::make_local(dest());
2070 }
2071 JVM_END
2072
2073 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2074 {
2075 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2076 JvmtiVMObjectAllocEventCollector oam;
2077 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2078 bounds_check(cp, index, CHECK_0);
2079 constantTag tag = cp->tag_at(index);
2080 if (!tag.is_field_or_method()) {
2081 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2082 }
2083 return (jint) cp->uncached_klass_ref_index_at(index);
2084 }
2085 JVM_END
2086
2087 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2088 {
2089 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2090 JvmtiVMObjectAllocEventCollector oam;
2091 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2092 bounds_check(cp, index, CHECK_0);
2093 constantTag tag = cp->tag_at(index);
2094 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2095 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2096 }
2097 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2098 }
2099 JVM_END
2100
2101 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2102 {
2103 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2104 JvmtiVMObjectAllocEventCollector oam;
2105 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2106 bounds_check(cp, index, CHECK_NULL);
2107 constantTag tag = cp->tag_at(index);
2108 if (!tag.is_name_and_type()) {
2109 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2110 }
2111 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2112 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2113 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2114 objArrayHandle dest(THREAD, dest_o);
2115 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2116 dest->obj_at_put(0, str());
2117 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2118 dest->obj_at_put(1, str());
2119 return (jobjectArray) JNIHandles::make_local(dest());
2120 }
2121 JVM_END
2122
2123 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2124 {
2125 JVMWrapper("JVM_ConstantPoolGetIntAt");
2126 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2127 bounds_check(cp, index, CHECK_0);
2128 constantTag tag = cp->tag_at(index);
2129 if (!tag.is_int()) {
2130 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2131 }
2132 return cp->int_at(index);
2133 }
2134 JVM_END
2135
2136 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2137 {
2138 JVMWrapper("JVM_ConstantPoolGetLongAt");
2139 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2140 bounds_check(cp, index, CHECK_(0L));
2141 constantTag tag = cp->tag_at(index);
2142 if (!tag.is_long()) {
2143 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2144 }
2145 return cp->long_at(index);
2146 }
2147 JVM_END
2148
2149 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2150 {
2151 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2152 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2153 bounds_check(cp, index, CHECK_(0.0f));
2154 constantTag tag = cp->tag_at(index);
2155 if (!tag.is_float()) {
2156 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2157 }
2158 return cp->float_at(index);
2159 }
2160 JVM_END
2161
2162 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2163 {
2164 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2165 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2166 bounds_check(cp, index, CHECK_(0.0));
2167 constantTag tag = cp->tag_at(index);
2168 if (!tag.is_double()) {
2169 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2170 }
2171 return cp->double_at(index);
2172 }
2173 JVM_END
2174
2175 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2176 {
2177 JVMWrapper("JVM_ConstantPoolGetStringAt");
2178 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2179 bounds_check(cp, index, CHECK_NULL);
2180 constantTag tag = cp->tag_at(index);
2181 if (!tag.is_string()) {
2182 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2183 }
2184 oop str = cp->string_at(index, CHECK_NULL);
2185 return (jstring) JNIHandles::make_local(str);
2186 }
2187 JVM_END
2188
2189 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2190 {
2191 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2192 JvmtiVMObjectAllocEventCollector oam;
2193 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2194 bounds_check(cp, index, CHECK_NULL);
2195 constantTag tag = cp->tag_at(index);
2196 if (!tag.is_symbol()) {
2197 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2198 }
2199 Symbol* sym = cp->symbol_at(index);
2200 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2201 return (jstring) JNIHandles::make_local(str());
2202 }
2203 JVM_END
2204
2205 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2206 {
2207 JVMWrapper("JVM_ConstantPoolGetTagAt");
2208 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2209 bounds_check(cp, index, CHECK_0);
2210 constantTag tag = cp->tag_at(index);
2211 jbyte result = tag.value();
2212 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2213 // they are changed to the corresponding tags from the JVM spec, so that java code in
2214 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2215 if (tag.is_klass_or_reference()) {
2216 result = JVM_CONSTANT_Class;
2217 } else if (tag.is_string_index()) {
2218 result = JVM_CONSTANT_String;
2219 } else if (tag.is_method_type_in_error()) {
2220 result = JVM_CONSTANT_MethodType;
2221 } else if (tag.is_method_handle_in_error()) {
2222 result = JVM_CONSTANT_MethodHandle;
2223 }
2224 return result;
2225 }
2226 JVM_END
2227
2228 // Assertion support. //////////////////////////////////////////////////////////
2229
2230 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2231 JVMWrapper("JVM_DesiredAssertionStatus");
2232 assert(cls != NULL, "bad class");
2233
2234 oop r = JNIHandles::resolve(cls);
2235 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2236 if (java_lang_Class::is_primitive(r)) return false;
2237
2238 Klass* k = java_lang_Class::as_Klass(r);
2239 assert(k->is_instance_klass(), "must be an instance klass");
2240 if (!k->is_instance_klass()) return false;
2241
2242 ResourceMark rm(THREAD);
2243 const char* name = k->name()->as_C_string();
2244 bool system_class = k->class_loader() == NULL;
2245 return JavaAssertions::enabled(name, system_class);
2246
2247 JVM_END
2248
2249
2250 // Return a new AssertionStatusDirectives object with the fields filled in with
2251 // command-line assertion arguments (i.e., -ea, -da).
2252 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2253 JVMWrapper("JVM_AssertionStatusDirectives");
2254 JvmtiVMObjectAllocEventCollector oam;
2255 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2256 return JNIHandles::make_local(env, asd);
2257 JVM_END
2258
2259 // Verification ////////////////////////////////////////////////////////////////////////////////
2260
2261 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2262
2263 // RedefineClasses support: bug 6214132 caused verification to fail.
2264 // All functions from this section should call the jvmtiThreadSate function:
2265 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2266 // The function returns a Klass* of the _scratch_class if the verifier
2267 // was invoked in the middle of the class redefinition.
2268 // Otherwise it returns its argument value which is the _the_class Klass*.
2269 // Please, refer to the description in the jvmtiThreadSate.hpp.
2270
2271 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2272 JVMWrapper("JVM_GetClassNameUTF");
2273 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2274 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2275 return k->name()->as_utf8();
2276 JVM_END
2277
2278
2279 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2280 JVMWrapper("JVM_GetClassCPTypes");
2281 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2282 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2283 // types will have length zero if this is not an InstanceKlass
2284 // (length is determined by call to JVM_GetClassCPEntriesCount)
2285 if (k->is_instance_klass()) {
2286 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2287 for (int index = cp->length() - 1; index >= 0; index--) {
2288 constantTag tag = cp->tag_at(index);
2289 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2290 }
2291 }
2292 JVM_END
2293
2294
2295 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2296 JVMWrapper("JVM_GetClassCPEntriesCount");
2297 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2298 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2299 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2300 JVM_END
2301
2302
2303 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2304 JVMWrapper("JVM_GetClassFieldsCount");
2305 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2306 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2307 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2308 JVM_END
2309
2310
2311 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2312 JVMWrapper("JVM_GetClassMethodsCount");
2313 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2314 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2315 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2316 JVM_END
2317
2318
2319 // The following methods, used for the verifier, are never called with
2320 // array klasses, so a direct cast to InstanceKlass is safe.
2321 // Typically, these methods are called in a loop with bounds determined
2322 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2323 // zero for arrays.
2324 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2325 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2326 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2327 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2328 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2329 int length = method->checked_exceptions_length();
2330 if (length > 0) {
2331 CheckedExceptionElement* table= method->checked_exceptions_start();
2332 for (int i = 0; i < length; i++) {
2333 exceptions[i] = table[i].class_cp_index;
2334 }
2335 }
2336 JVM_END
2337
2338
2339 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2340 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2341 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2342 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2343 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2344 return method->checked_exceptions_length();
2345 JVM_END
2346
2347
2348 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2349 JVMWrapper("JVM_GetMethodIxByteCode");
2350 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2351 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2352 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2353 memcpy(code, method->code_base(), method->code_size());
2354 JVM_END
2355
2356
2357 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2358 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2359 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2360 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2361 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2362 return method->code_size();
2363 JVM_END
2364
2365
2366 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2367 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2368 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2369 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2370 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2371 ExceptionTable extable(method);
2372 entry->start_pc = extable.start_pc(entry_index);
2373 entry->end_pc = extable.end_pc(entry_index);
2374 entry->handler_pc = extable.handler_pc(entry_index);
2375 entry->catchType = extable.catch_type_index(entry_index);
2376 JVM_END
2377
2378
2379 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2380 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2381 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2382 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2383 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2384 return method->exception_table_length();
2385 JVM_END
2386
2387
2388 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2389 JVMWrapper("JVM_GetMethodIxModifiers");
2390 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2391 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2392 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2393 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2394 JVM_END
2395
2396
2397 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2398 JVMWrapper("JVM_GetFieldIxModifiers");
2399 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2400 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2401 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2402 JVM_END
2403
2404
2405 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2406 JVMWrapper("JVM_GetMethodIxLocalsCount");
2407 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2408 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2409 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2410 return method->max_locals();
2411 JVM_END
2412
2413
2414 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2415 JVMWrapper("JVM_GetMethodIxArgsSize");
2416 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2417 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2418 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2419 return method->size_of_parameters();
2420 JVM_END
2421
2422
2423 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2424 JVMWrapper("JVM_GetMethodIxMaxStack");
2425 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2426 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2427 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2428 return method->verifier_max_stack();
2429 JVM_END
2430
2431
2432 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2433 JVMWrapper("JVM_IsConstructorIx");
2434 ResourceMark rm(THREAD);
2435 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2436 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2437 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2438 return method->name() == vmSymbols::object_initializer_name();
2439 JVM_END
2440
2441
2442 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2443 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2444 ResourceMark rm(THREAD);
2445 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2446 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2447 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2448 return method->is_overpass();
2449 JVM_END
2450
2451 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2452 JVMWrapper("JVM_GetMethodIxIxUTF");
2453 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2454 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2455 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2456 return method->name()->as_utf8();
2457 JVM_END
2458
2459
2460 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2461 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2462 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2463 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2464 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2465 return method->signature()->as_utf8();
2466 JVM_END
2467
2468 /**
2469 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2470 * read entries in the constant pool. Since the old verifier always
2471 * works on a copy of the code, it will not see any rewriting that
2472 * may possibly occur in the middle of verification. So it is important
2473 * that nothing it calls tries to use the cpCache instead of the raw
2474 * constant pool, so we must use cp->uncached_x methods when appropriate.
2475 */
2476 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2477 JVMWrapper("JVM_GetCPFieldNameUTF");
2478 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2479 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2480 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2481 switch (cp->tag_at(cp_index).value()) {
2482 case JVM_CONSTANT_Fieldref:
2483 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2484 default:
2485 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2486 }
2487 ShouldNotReachHere();
2488 return NULL;
2489 JVM_END
2490
2491
2492 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2493 JVMWrapper("JVM_GetCPMethodNameUTF");
2494 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2495 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2496 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2497 switch (cp->tag_at(cp_index).value()) {
2498 case JVM_CONSTANT_InterfaceMethodref:
2499 case JVM_CONSTANT_Methodref:
2500 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2501 default:
2502 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2503 }
2504 ShouldNotReachHere();
2505 return NULL;
2506 JVM_END
2507
2508
2509 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2510 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2511 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2512 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2513 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2514 switch (cp->tag_at(cp_index).value()) {
2515 case JVM_CONSTANT_InterfaceMethodref:
2516 case JVM_CONSTANT_Methodref:
2517 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2518 default:
2519 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2520 }
2521 ShouldNotReachHere();
2522 return NULL;
2523 JVM_END
2524
2525
2526 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2527 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2528 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2529 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2530 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2531 switch (cp->tag_at(cp_index).value()) {
2532 case JVM_CONSTANT_Fieldref:
2533 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2534 default:
2535 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2536 }
2537 ShouldNotReachHere();
2538 return NULL;
2539 JVM_END
2540
2541
2542 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2543 JVMWrapper("JVM_GetCPClassNameUTF");
2544 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2545 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2546 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2547 Symbol* classname = cp->klass_name_at(cp_index);
2548 return classname->as_utf8();
2549 JVM_END
2550
2551
2552 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2553 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2554 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2555 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2556 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2557 switch (cp->tag_at(cp_index).value()) {
2558 case JVM_CONSTANT_Fieldref: {
2559 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2560 Symbol* classname = cp->klass_name_at(class_index);
2561 return classname->as_utf8();
2562 }
2563 default:
2564 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2565 }
2566 ShouldNotReachHere();
2567 return NULL;
2568 JVM_END
2569
2570
2571 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2572 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2573 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2574 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2575 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2576 switch (cp->tag_at(cp_index).value()) {
2577 case JVM_CONSTANT_Methodref:
2578 case JVM_CONSTANT_InterfaceMethodref: {
2579 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2580 Symbol* classname = cp->klass_name_at(class_index);
2581 return classname->as_utf8();
2582 }
2583 default:
2584 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2585 }
2586 ShouldNotReachHere();
2587 return NULL;
2588 JVM_END
2589
2590
2591 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2592 JVMWrapper("JVM_GetCPFieldModifiers");
2593 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2594 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2595 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2596 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2597 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2598 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2599 switch (cp->tag_at(cp_index).value()) {
2600 case JVM_CONSTANT_Fieldref: {
2601 Symbol* name = cp->uncached_name_ref_at(cp_index);
2602 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2603 InstanceKlass* ik = InstanceKlass::cast(k_called);
2604 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2605 if (fs.name() == name && fs.signature() == signature) {
2606 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2607 }
2608 }
2609 return -1;
2610 }
2611 default:
2612 fatal("JVM_GetCPFieldModifiers: illegal constant");
2613 }
2614 ShouldNotReachHere();
2615 return 0;
2616 JVM_END
2617
2618
2619 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2620 JVMWrapper("JVM_GetCPMethodModifiers");
2621 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2622 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2623 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2624 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2625 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2626 switch (cp->tag_at(cp_index).value()) {
2627 case JVM_CONSTANT_Methodref:
2628 case JVM_CONSTANT_InterfaceMethodref: {
2629 Symbol* name = cp->uncached_name_ref_at(cp_index);
2630 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2631 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2632 int methods_count = methods->length();
2633 for (int i = 0; i < methods_count; i++) {
2634 Method* method = methods->at(i);
2635 if (method->name() == name && method->signature() == signature) {
2636 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2637 }
2638 }
2639 return -1;
2640 }
2641 default:
2642 fatal("JVM_GetCPMethodModifiers: illegal constant");
2643 }
2644 ShouldNotReachHere();
2645 return 0;
2646 JVM_END
2647
2648
2649 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2650
2651 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2652 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2653 JVM_END
2654
2655
2656 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2657 JVMWrapper("JVM_IsSameClassPackage");
2658 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2659 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2660 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2661 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2662 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2663 JVM_END
2664
2665 // Printing support //////////////////////////////////////////////////
2666 extern "C" {
2667
2668 ATTRIBUTE_PRINTF(3, 0)
2669 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2670 // see bug 4399518, 4417214
2671 if ((intptr_t)count <= 0) return -1;
2672
2673 int result = vsnprintf(str, count, fmt, args);
2674 // Note: on truncation vsnprintf(3) on Unix returns numbers of
2675 // characters which would have been written had the buffer been large
2676 // enough; on Windows, it returns -1. We handle both cases here and
2677 // always return -1, and perform null termination.
2678 if ((result > 0 && (size_t)result >= count) || result == -1) {
2679 str[count - 1] = '\0';
2680 result = -1;
2681 }
2682
2683 return result;
2684 }
2685
2686 ATTRIBUTE_PRINTF(3, 0)
2687 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2688 va_list args;
2689 int len;
2690 va_start(args, fmt);
2691 len = jio_vsnprintf(str, count, fmt, args);
2692 va_end(args);
2693 return len;
2694 }
2695
2696 ATTRIBUTE_PRINTF(2,3)
2697 int jio_fprintf(FILE* f, const char *fmt, ...) {
2698 int len;
2699 va_list args;
2700 va_start(args, fmt);
2701 len = jio_vfprintf(f, fmt, args);
2702 va_end(args);
2703 return len;
2704 }
2705
2706 ATTRIBUTE_PRINTF(2, 0)
2707 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2708 if (Arguments::vfprintf_hook() != NULL) {
2709 return Arguments::vfprintf_hook()(f, fmt, args);
2710 } else {
2711 return vfprintf(f, fmt, args);
2712 }
2713 }
2714
2715 ATTRIBUTE_PRINTF(1, 2)
2716 JNIEXPORT int jio_printf(const char *fmt, ...) {
2717 int len;
2718 va_list args;
2719 va_start(args, fmt);
2720 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2721 va_end(args);
2722 return len;
2723 }
2724
2725
2726 // HotSpot specific jio method
2727 void jio_print(const char* s) {
2728 // Try to make this function as atomic as possible.
2729 if (Arguments::vfprintf_hook() != NULL) {
2730 jio_fprintf(defaultStream::output_stream(), "%s", s);
2731 } else {
2732 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2733 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2734 }
2735 }
2736
2737 } // Extern C
2738
2739 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2740
2741 // In most of the JVM thread support functions we need to access the
2742 // thread through a ThreadsListHandle to prevent it from exiting and
2743 // being reclaimed while we try to operate on it. The exceptions to this
2744 // rule are when operating on the current thread, or if the monitor of
2745 // the target java.lang.Thread is locked at the Java level - in both
2746 // cases the target cannot exit.
2747
2748 static void thread_entry(JavaThread* thread, TRAPS) {
2749 HandleMark hm(THREAD);
2750 Handle obj(THREAD, thread->threadObj());
2751 JavaValue result(T_VOID);
2752 JavaCalls::call_virtual(&result,
2753 obj,
2754 SystemDictionary::Thread_klass(),
2755 vmSymbols::run_method_name(),
2756 vmSymbols::void_method_signature(),
2757 THREAD);
2758 }
2759
2760
2761 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2762 JVMWrapper("JVM_StartThread");
2763 JavaThread *native_thread = NULL;
2764
2765 // We cannot hold the Threads_lock when we throw an exception,
2766 // due to rank ordering issues. Example: we might need to grab the
2767 // Heap_lock while we construct the exception.
2768 bool throw_illegal_thread_state = false;
2769
2770 // We must release the Threads_lock before we can post a jvmti event
2771 // in Thread::start.
2772 {
2773 // Ensure that the C++ Thread and OSThread structures aren't freed before
2774 // we operate.
2775 MutexLocker mu(Threads_lock);
2776
2777 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2778 // re-starting an already started thread, so we should usually find
2779 // that the JavaThread is null. However for a JNI attached thread
2780 // there is a small window between the Thread object being created
2781 // (with its JavaThread set) and the update to its threadStatus, so we
2782 // have to check for this
2783 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2784 throw_illegal_thread_state = true;
2785 } else {
2786 // We could also check the stillborn flag to see if this thread was already stopped, but
2787 // for historical reasons we let the thread detect that itself when it starts running
2788
2789 jlong size =
2790 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2791 // Allocate the C++ Thread structure and create the native thread. The
2792 // stack size retrieved from java is 64-bit signed, but the constructor takes
2793 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2794 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2795 // - Avoid passing negative values which would result in really large stacks.
2796 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2797 size_t sz = size > 0 ? (size_t) size : 0;
2798 native_thread = new JavaThread(&thread_entry, sz);
2799
2800 // At this point it may be possible that no osthread was created for the
2801 // JavaThread due to lack of memory. Check for this situation and throw
2802 // an exception if necessary. Eventually we may want to change this so
2803 // that we only grab the lock if the thread was created successfully -
2804 // then we can also do this check and throw the exception in the
2805 // JavaThread constructor.
2806 if (native_thread->osthread() != NULL) {
2807 // Note: the current thread is not being used within "prepare".
2808 native_thread->prepare(jthread);
2809 }
2810 }
2811 }
2812
2813 if (throw_illegal_thread_state) {
2814 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2815 }
2816
2817 assert(native_thread != NULL, "Starting null thread?");
2818
2819 if (native_thread->osthread() == NULL) {
2820 // No one should hold a reference to the 'native_thread'.
2821 native_thread->smr_delete();
2822 if (JvmtiExport::should_post_resource_exhausted()) {
2823 JvmtiExport::post_resource_exhausted(
2824 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2825 os::native_thread_creation_failed_msg());
2826 }
2827 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2828 os::native_thread_creation_failed_msg());
2829 }
2830
2831 Thread::start(native_thread);
2832
2833 JVM_END
2834
2835
2836 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2837 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2838 // but is thought to be reliable and simple. In the case, where the receiver is the
2839 // same thread as the sender, no VM_Operation is needed.
2840 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2841 JVMWrapper("JVM_StopThread");
2842
2843 // A nested ThreadsListHandle will grab the Threads_lock so create
2844 // tlh before we resolve throwable.
2845 ThreadsListHandle tlh(thread);
2846 oop java_throwable = JNIHandles::resolve(throwable);
2847 if (java_throwable == NULL) {
2848 THROW(vmSymbols::java_lang_NullPointerException());
2849 }
2850 oop java_thread = NULL;
2851 JavaThread* receiver = NULL;
2852 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2853 Events::log_exception(thread,
2854 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2855 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2856
2857 if (is_alive) {
2858 // jthread refers to a live JavaThread.
2859 if (thread == receiver) {
2860 // Exception is getting thrown at self so no VM_Operation needed.
2861 THROW_OOP(java_throwable);
2862 } else {
2863 // Use a VM_Operation to throw the exception.
2864 Thread::send_async_exception(java_thread, java_throwable);
2865 }
2866 } else {
2867 // Either:
2868 // - target thread has not been started before being stopped, or
2869 // - target thread already terminated
2870 // We could read the threadStatus to determine which case it is
2871 // but that is overkill as it doesn't matter. We must set the
2872 // stillborn flag for the first case, and if the thread has already
2873 // exited setting this flag has no effect.
2874 java_lang_Thread::set_stillborn(java_thread);
2875 }
2876 JVM_END
2877
2878
2879 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2880 JVMWrapper("JVM_IsThreadAlive");
2881
2882 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2883 return java_lang_Thread::is_alive(thread_oop);
2884 JVM_END
2885
2886
2887 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2888 JVMWrapper("JVM_SuspendThread");
2889
2890 ThreadsListHandle tlh(thread);
2891 JavaThread* receiver = NULL;
2892 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2893 if (is_alive) {
2894 // jthread refers to a live JavaThread.
2895 {
2896 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2897 if (receiver->is_external_suspend()) {
2898 // Don't allow nested external suspend requests. We can't return
2899 // an error from this interface so just ignore the problem.
2900 return;
2901 }
2902 if (receiver->is_exiting()) { // thread is in the process of exiting
2903 return;
2904 }
2905 receiver->set_external_suspend();
2906 }
2907
2908 // java_suspend() will catch threads in the process of exiting
2909 // and will ignore them.
2910 receiver->java_suspend();
2911
2912 // It would be nice to have the following assertion in all the
2913 // time, but it is possible for a racing resume request to have
2914 // resumed this thread right after we suspended it. Temporarily
2915 // enable this assertion if you are chasing a different kind of
2916 // bug.
2917 //
2918 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2919 // receiver->is_being_ext_suspended(), "thread is not suspended");
2920 }
2921 JVM_END
2922
2923
2924 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2925 JVMWrapper("JVM_ResumeThread");
2926
2927 ThreadsListHandle tlh(thread);
2928 JavaThread* receiver = NULL;
2929 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2930 if (is_alive) {
2931 // jthread refers to a live JavaThread.
2932
2933 // This is the original comment for this Threads_lock grab:
2934 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2935 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2936 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2937 // looks at it.
2938 //
2939 // The above comment dates back to when we had both internal and
2940 // external suspend APIs that shared a common underlying mechanism.
2941 // External suspend is now entirely cooperative and doesn't share
2942 // anything with internal suspend. That said, there are some
2943 // assumptions in the VM that an external resume grabs the
2944 // Threads_lock. We can't drop the Threads_lock grab here until we
2945 // resolve the assumptions that exist elsewhere.
2946 //
2947 MutexLocker ml(Threads_lock);
2948 receiver->java_resume();
2949 }
2950 JVM_END
2951
2952
2953 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2954 JVMWrapper("JVM_SetThreadPriority");
2955
2956 ThreadsListHandle tlh(thread);
2957 oop java_thread = NULL;
2958 JavaThread* receiver = NULL;
2959 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2960 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2961
2962 if (is_alive) {
2963 // jthread refers to a live JavaThread.
2964 Thread::set_priority(receiver, (ThreadPriority)prio);
2965 }
2966 // Implied else: If the JavaThread hasn't started yet, then the
2967 // priority set in the java.lang.Thread object above will be pushed
2968 // down when it does start.
2969 JVM_END
2970
2971
2972 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2973 JVMWrapper("JVM_Yield");
2974 if (os::dont_yield()) return;
2975 HOTSPOT_THREAD_YIELD();
2976 os::naked_yield();
2977 JVM_END
2978
2979
2980 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2981 JVMWrapper("JVM_Sleep");
2982
2983 if (millis < 0) {
2984 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2985 }
2986
2987 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2988 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2989 }
2990
2991 // Save current thread state and restore it at the end of this block.
2992 // And set new thread state to SLEEPING.
2993 JavaThreadSleepState jtss(thread);
2994
2995 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2996
2997 EventThreadSleep event;
2998
2999 if (millis == 0) {
3000 os::naked_yield();
3001 } else {
3002 ThreadState old_state = thread->osthread()->get_state();
3003 thread->osthread()->set_state(SLEEPING);
3004 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3005 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3006 // us while we were sleeping. We do not overwrite those.
3007 if (!HAS_PENDING_EXCEPTION) {
3008 if (event.should_commit()) {
3009 event.set_time(millis);
3010 event.commit();
3011 }
3012 HOTSPOT_THREAD_SLEEP_END(1);
3013
3014 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3015 // to properly restore the thread state. That's likely wrong.
3016 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3017 }
3018 }
3019 thread->osthread()->set_state(old_state);
3020 }
3021 if (event.should_commit()) {
3022 event.set_time(millis);
3023 event.commit();
3024 }
3025 HOTSPOT_THREAD_SLEEP_END(0);
3026 JVM_END
3027
3028 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3029 JVMWrapper("JVM_CurrentThread");
3030 oop jthread = thread->threadObj();
3031 assert (thread != NULL, "no current thread!");
3032 return JNIHandles::make_local(env, jthread);
3033 JVM_END
3034
3035
3036 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3037 JVMWrapper("JVM_CountStackFrames");
3038
3039 uint32_t debug_bits = 0;
3040 ThreadsListHandle tlh(thread);
3041 JavaThread* receiver = NULL;
3042 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3043 int count = 0;
3044 if (is_alive) {
3045 // jthread refers to a live JavaThread.
3046 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
3047 // Count all java activation, i.e., number of vframes.
3048 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) {
3049 // Native frames are not counted.
3050 if (!vfst.method()->is_native()) count++;
3051 }
3052 } else {
3053 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3054 "this thread is not suspended");
3055 }
3056 }
3057 // Implied else: if JavaThread is not alive simply return a count of 0.
3058
3059 return count;
3060 JVM_END
3061
3062
3063 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3064 JVMWrapper("JVM_Interrupt");
3065
3066 ThreadsListHandle tlh(thread);
3067 JavaThread* receiver = NULL;
3068 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3069 if (is_alive) {
3070 // jthread refers to a live JavaThread.
3071 Thread::interrupt(receiver);
3072 }
3073 JVM_END
3074
3075
3076 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3077 JVMWrapper("JVM_IsInterrupted");
3078
3079 ThreadsListHandle tlh(thread);
3080 JavaThread* receiver = NULL;
3081 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3082 if (is_alive) {
3083 // jthread refers to a live JavaThread.
3084 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3085 } else {
3086 return JNI_FALSE;
3087 }
3088 JVM_END
3089
3090
3091 // Return true iff the current thread has locked the object passed in
3092
3093 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3094 JVMWrapper("JVM_HoldsLock");
3095 assert(THREAD->is_Java_thread(), "sanity check");
3096 if (obj == NULL) {
3097 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3098 }
3099 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3100 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3101 JVM_END
3102
3103
3104 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3105 JVMWrapper("JVM_DumpAllStacks");
3106 VM_PrintThreads op;
3107 VMThread::execute(&op);
3108 if (JvmtiExport::should_post_data_dump()) {
3109 JvmtiExport::post_data_dump();
3110 }
3111 JVM_END
3112
3113 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3114 JVMWrapper("JVM_SetNativeThreadName");
3115
3116 // We don't use a ThreadsListHandle here because the current thread
3117 // must be alive.
3118 oop java_thread = JNIHandles::resolve_non_null(jthread);
3119 JavaThread* thr = java_lang_Thread::thread(java_thread);
3120 if (thread == thr && !thr->has_attached_via_jni()) {
3121 // Thread naming is only supported for the current thread and
3122 // we don't set the name of an attached thread to avoid stepping
3123 // on other programs.
3124 ResourceMark rm(thread);
3125 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3126 os::set_native_thread_name(thread_name);
3127 }
3128 JVM_END
3129
3130 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3131
3132 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3133 JVMWrapper("JVM_GetClassContext");
3134 ResourceMark rm(THREAD);
3135 JvmtiVMObjectAllocEventCollector oam;
3136 vframeStream vfst(thread);
3137
3138 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3139 // This must only be called from SecurityManager.getClassContext
3140 Method* m = vfst.method();
3141 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3142 m->name() == vmSymbols::getClassContext_name() &&
3143 m->signature() == vmSymbols::void_class_array_signature())) {
3144 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3145 }
3146 }
3147
3148 // Collect method holders
3149 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3150 for (; !vfst.at_end(); vfst.security_next()) {
3151 Method* m = vfst.method();
3152 // Native frames are not returned
3153 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3154 Klass* holder = m->method_holder();
3155 assert(holder->is_klass(), "just checking");
3156 klass_array->append(holder);
3157 }
3158 }
3159
3160 // Create result array of type [Ljava/lang/Class;
3161 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3162 // Fill in mirrors corresponding to method holders
3163 for (int i = 0; i < klass_array->length(); i++) {
3164 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3165 }
3166
3167 return (jobjectArray) JNIHandles::make_local(env, result);
3168 JVM_END
3169
3170
3171 // java.lang.Package ////////////////////////////////////////////////////////////////
3172
3173
3174 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3175 JVMWrapper("JVM_GetSystemPackage");
3176 ResourceMark rm(THREAD);
3177 JvmtiVMObjectAllocEventCollector oam;
3178 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3179 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3180 return (jstring) JNIHandles::make_local(result);
3181 JVM_END
3182
3183
3184 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3185 JVMWrapper("JVM_GetSystemPackages");
3186 JvmtiVMObjectAllocEventCollector oam;
3187 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3188 return (jobjectArray) JNIHandles::make_local(result);
3189 JVM_END
3190
3191
3192 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3193
3194
3195 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3196 JVMWrapper("JVM_GetAndClearReferencePendingList");
3197
3198 MonitorLockerEx ml(Heap_lock);
3199 oop ref = Universe::reference_pending_list();
3200 if (ref != NULL) {
3201 Universe::set_reference_pending_list(NULL);
3202 }
3203 return JNIHandles::make_local(env, ref);
3204 JVM_END
3205
3206 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3207 JVMWrapper("JVM_HasReferencePendingList");
3208 MonitorLockerEx ml(Heap_lock);
3209 return Universe::has_reference_pending_list();
3210 JVM_END
3211
3212 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3213 JVMWrapper("JVM_WaitForReferencePendingList");
3214 MonitorLockerEx ml(Heap_lock);
3215 while (!Universe::has_reference_pending_list()) {
3216 ml.wait();
3217 }
3218 JVM_END
3219
3220
3221 // ObjectInputStream ///////////////////////////////////////////////////////////////
3222
3223 // Return the first user-defined class loader up the execution stack, or null
3224 // if only code from the bootstrap or platform class loader is on the stack.
3225
3226 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3227 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3228 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3229 oop loader = vfst.method()->method_holder()->class_loader();
3230 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3231 return JNIHandles::make_local(env, loader);
3232 }
3233 }
3234 return NULL;
3235 JVM_END
3236
3237
3238 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3239
3240
3241 // resolve array handle and check arguments
3242 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3243 if (arr == NULL) {
3244 THROW_0(vmSymbols::java_lang_NullPointerException());
3245 }
3246 oop a = JNIHandles::resolve_non_null(arr);
3247 if (!a->is_array()) {
3248 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3249 } else if (type_array_only && !a->is_typeArray()) {
3250 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3251 }
3252 return arrayOop(a);
3253 }
3254
3255
3256 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3257 JVMWrapper("JVM_GetArrayLength");
3258 arrayOop a = check_array(env, arr, false, CHECK_0);
3259 return a->length();
3260 JVM_END
3261
3262
3263 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3264 JVMWrapper("JVM_Array_Get");
3265 JvmtiVMObjectAllocEventCollector oam;
3266 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3267 jvalue value;
3268 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3269 oop box = Reflection::box(&value, type, CHECK_NULL);
3270 return JNIHandles::make_local(env, box);
3271 JVM_END
3272
3273
3274 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3275 JVMWrapper("JVM_GetPrimitiveArrayElement");
3276 jvalue value;
3277 value.i = 0; // to initialize value before getting used in CHECK
3278 arrayOop a = check_array(env, arr, true, CHECK_(value));
3279 assert(a->is_typeArray(), "just checking");
3280 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3281 BasicType wide_type = (BasicType) wCode;
3282 if (type != wide_type) {
3283 Reflection::widen(&value, type, wide_type, CHECK_(value));
3284 }
3285 return value;
3286 JVM_END
3287
3288
3289 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3290 JVMWrapper("JVM_SetArrayElement");
3291 arrayOop a = check_array(env, arr, false, CHECK);
3292 oop box = JNIHandles::resolve(val);
3293 jvalue value;
3294 value.i = 0; // to initialize value before getting used in CHECK
3295 BasicType value_type;
3296 if (a->is_objArray()) {
3297 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3298 value_type = Reflection::unbox_for_regular_object(box, &value);
3299 } else {
3300 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3301 }
3302 Reflection::array_set(&value, a, index, value_type, CHECK);
3303 JVM_END
3304
3305
3306 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3307 JVMWrapper("JVM_SetPrimitiveArrayElement");
3308 arrayOop a = check_array(env, arr, true, CHECK);
3309 assert(a->is_typeArray(), "just checking");
3310 BasicType value_type = (BasicType) vCode;
3311 Reflection::array_set(&v, a, index, value_type, CHECK);
3312 JVM_END
3313
3314
3315 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3316 JVMWrapper("JVM_NewArray");
3317 JvmtiVMObjectAllocEventCollector oam;
3318 oop element_mirror = JNIHandles::resolve(eltClass);
3319 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3320 return JNIHandles::make_local(env, result);
3321 JVM_END
3322
3323
3324 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3325 JVMWrapper("JVM_NewMultiArray");
3326 JvmtiVMObjectAllocEventCollector oam;
3327 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3328 oop element_mirror = JNIHandles::resolve(eltClass);
3329 assert(dim_array->is_typeArray(), "just checking");
3330 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3331 return JNIHandles::make_local(env, result);
3332 JVM_END
3333
3334
3335 // Library support ///////////////////////////////////////////////////////////////////////////
3336
3337 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3338 //%note jvm_ct
3339 JVMWrapper("JVM_LoadLibrary");
3340 char ebuf[1024];
3341 void *load_result;
3342 {
3343 ThreadToNativeFromVM ttnfvm(thread);
3344 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3345 }
3346 if (load_result == NULL) {
3347 char msg[1024];
3348 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3349 // Since 'ebuf' may contain a string encoded using
3350 // platform encoding scheme, we need to pass
3351 // Exceptions::unsafe_to_utf8 to the new_exception method
3352 // as the last argument. See bug 6367357.
3353 Handle h_exception =
3354 Exceptions::new_exception(thread,
3355 vmSymbols::java_lang_UnsatisfiedLinkError(),
3356 msg, Exceptions::unsafe_to_utf8);
3357
3358 THROW_HANDLE_0(h_exception);
3359 }
3360 return load_result;
3361 JVM_END
3362
3363
3364 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3365 JVMWrapper("JVM_UnloadLibrary");
3366 os::dll_unload(handle);
3367 JVM_END
3368
3369
3370 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3371 JVMWrapper("JVM_FindLibraryEntry");
3372 return os::dll_lookup(handle, name);
3373 JVM_END
3374
3375
3376 // JNI version ///////////////////////////////////////////////////////////////////////////////
3377
3378 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3379 JVMWrapper("JVM_IsSupportedJNIVersion");
3380 return Threads::is_supported_jni_version_including_1_1(version);
3381 JVM_END
3382
3383
3384 // String support ///////////////////////////////////////////////////////////////////////////
3385
3386 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3387 JVMWrapper("JVM_InternString");
3388 JvmtiVMObjectAllocEventCollector oam;
3389 if (str == NULL) return NULL;
3390 oop string = JNIHandles::resolve_non_null(str);
3391 oop result = StringTable::intern(string, CHECK_NULL);
3392 return (jstring) JNIHandles::make_local(env, result);
3393 JVM_END
3394
3395
3396 // Raw monitor support //////////////////////////////////////////////////////////////////////
3397
3398 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3399 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3400 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3401 // that only works with java threads.
3402
3403
3404 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3405 VM_Exit::block_if_vm_exited();
3406 JVMWrapper("JVM_RawMonitorCreate");
3407 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3408 }
3409
3410
3411 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3412 VM_Exit::block_if_vm_exited();
3413 JVMWrapper("JVM_RawMonitorDestroy");
3414 delete ((Mutex*) mon);
3415 }
3416
3417
3418 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3419 VM_Exit::block_if_vm_exited();
3420 JVMWrapper("JVM_RawMonitorEnter");
3421 ((Mutex*) mon)->jvm_raw_lock();
3422 return 0;
3423 }
3424
3425
3426 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3427 VM_Exit::block_if_vm_exited();
3428 JVMWrapper("JVM_RawMonitorExit");
3429 ((Mutex*) mon)->jvm_raw_unlock();
3430 }
3431
3432
3433 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3434
3435 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3436 Handle loader, Handle protection_domain,
3437 jboolean throwError, TRAPS) {
3438 // Security Note:
3439 // The Java level wrapper will perform the necessary security check allowing
3440 // us to pass the NULL as the initiating class loader. The VM is responsible for
3441 // the checkPackageAccess relative to the initiating class loader via the
3442 // protection_domain. The protection_domain is passed as NULL by the java code
3443 // if there is no security manager in 3-arg Class.forName().
3444 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3445
3446 // Check if we should initialize the class
3447 if (init && klass->is_instance_klass()) {
3448 klass->initialize(CHECK_NULL);
3449 }
3450 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3451 }
3452
3453
3454 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3455
3456 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3457 JVMWrapper("JVM_InvokeMethod");
3458 Handle method_handle;
3459 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3460 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3461 Handle receiver(THREAD, JNIHandles::resolve(obj));
3462 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3463 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3464 jobject res = JNIHandles::make_local(env, result);
3465 if (JvmtiExport::should_post_vm_object_alloc()) {
3466 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3467 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3468 if (java_lang_Class::is_primitive(ret_type)) {
3469 // Only for primitive type vm allocates memory for java object.
3470 // See box() method.
3471 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3472 }
3473 }
3474 return res;
3475 } else {
3476 THROW_0(vmSymbols::java_lang_StackOverflowError());
3477 }
3478 JVM_END
3479
3480
3481 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3482 JVMWrapper("JVM_NewInstanceFromConstructor");
3483 oop constructor_mirror = JNIHandles::resolve(c);
3484 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3485 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3486 jobject res = JNIHandles::make_local(env, result);
3487 if (JvmtiExport::should_post_vm_object_alloc()) {
3488 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3489 }
3490 return res;
3491 JVM_END
3492
3493 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3494
3495 JVM_LEAF(jboolean, JVM_SupportsCX8())
3496 JVMWrapper("JVM_SupportsCX8");
3497 return VM_Version::supports_cx8();
3498 JVM_END
3499
3500 // Returns an array of all live Thread objects (VM internal JavaThreads,
3501 // jvmti agent threads, and JNI attaching threads are skipped)
3502 // See CR 6404306 regarding JNI attaching threads
3503 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3504 ResourceMark rm(THREAD);
3505 ThreadsListEnumerator tle(THREAD, false, false);
3506 JvmtiVMObjectAllocEventCollector oam;
3507
3508 int num_threads = tle.num_threads();
3509 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3510 objArrayHandle threads_ah(THREAD, r);
3511
3512 for (int i = 0; i < num_threads; i++) {
3513 Handle h = tle.get_threadObj(i);
3514 threads_ah->obj_at_put(i, h());
3515 }
3516
3517 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3518 JVM_END
3519
3520
3521 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3522 // Return StackTraceElement[][], each element is the stack trace of a thread in
3523 // the corresponding entry in the given threads array
3524 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3525 JVMWrapper("JVM_DumpThreads");
3526 JvmtiVMObjectAllocEventCollector oam;
3527
3528 // Check if threads is null
3529 if (threads == NULL) {
3530 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3531 }
3532
3533 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3534 objArrayHandle ah(THREAD, a);
3535 int num_threads = ah->length();
3536 // check if threads is non-empty array
3537 if (num_threads == 0) {
3538 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3539 }
3540
3541 // check if threads is not an array of objects of Thread class
3542 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3543 if (k != SystemDictionary::Thread_klass()) {
3544 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3545 }
3546
3547 ResourceMark rm(THREAD);
3548
3549 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3550 for (int i = 0; i < num_threads; i++) {
3551 oop thread_obj = ah->obj_at(i);
3552 instanceHandle h(THREAD, (instanceOop) thread_obj);
3553 thread_handle_array->append(h);
3554 }
3555
3556 // The JavaThread references in thread_handle_array are validated
3557 // in VM_ThreadDump::doit().
3558 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3559 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3560
3561 JVM_END
3562
3563 // JVM monitoring and management support
3564 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3565 return Management::get_jmm_interface(version);
3566 JVM_END
3567
3568 // com.sun.tools.attach.VirtualMachine agent properties support
3569 //
3570 // Initialize the agent properties with the properties maintained in the VM
3571 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3572 JVMWrapper("JVM_InitAgentProperties");
3573 ResourceMark rm;
3574
3575 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3576
3577 PUTPROP(props, "sun.java.command", Arguments::java_command());
3578 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3579 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3580 return properties;
3581 JVM_END
3582
3583 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3584 {
3585 JVMWrapper("JVM_GetEnclosingMethodInfo");
3586 JvmtiVMObjectAllocEventCollector oam;
3587
3588 if (ofClass == NULL) {
3589 return NULL;
3590 }
3591 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3592 // Special handling for primitive objects
3593 if (java_lang_Class::is_primitive(mirror())) {
3594 return NULL;
3595 }
3596 Klass* k = java_lang_Class::as_Klass(mirror());
3597 if (!k->is_instance_klass()) {
3598 return NULL;
3599 }
3600 InstanceKlass* ik = InstanceKlass::cast(k);
3601 int encl_method_class_idx = ik->enclosing_method_class_index();
3602 if (encl_method_class_idx == 0) {
3603 return NULL;
3604 }
3605 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3606 objArrayHandle dest(THREAD, dest_o);
3607 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3608 dest->obj_at_put(0, enc_k->java_mirror());
3609 int encl_method_method_idx = ik->enclosing_method_method_index();
3610 if (encl_method_method_idx != 0) {
3611 Symbol* sym = ik->constants()->symbol_at(
3612 extract_low_short_from_int(
3613 ik->constants()->name_and_type_at(encl_method_method_idx)));
3614 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3615 dest->obj_at_put(1, str());
3616 sym = ik->constants()->symbol_at(
3617 extract_high_short_from_int(
3618 ik->constants()->name_and_type_at(encl_method_method_idx)));
3619 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3620 dest->obj_at_put(2, str());
3621 }
3622 return (jobjectArray) JNIHandles::make_local(dest());
3623 }
3624 JVM_END
3625
3626 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3627 {
3628 memset(info, 0, info_size);
3629
3630 info->jvm_version = Abstract_VM_Version::jvm_version();
3631 info->patch_version = Abstract_VM_Version::vm_patch_version();
3632
3633 // when we add a new capability in the jvm_version_info struct, we should also
3634 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3635 // counter defined in runtimeService.cpp.
3636 info->is_attach_supported = AttachListener::is_attach_supported();
3637 }
3638 JVM_END
3639
3640 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3641 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3642 ResourceMark rm(THREAD);
3643
3644 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3645 return NULL;
3646 }
3647
3648 char** vm_flags = Arguments::jvm_flags_array();
3649 char** vm_args = Arguments::jvm_args_array();
3650 int num_flags = Arguments::num_jvm_flags();
3651 int num_args = Arguments::num_jvm_args();
3652
3653 InstanceKlass* ik = SystemDictionary::String_klass();
3654 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3655 objArrayHandle result_h(THREAD, r);
3656
3657 int index = 0;
3658 for (int j = 0; j < num_flags; j++, index++) {
3659 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3660 result_h->obj_at_put(index, h());
3661 }
3662 for (int i = 0; i < num_args; i++, index++) {
3663 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3664 result_h->obj_at_put(index, h());
3665 }
3666 return (jobjectArray) JNIHandles::make_local(env, result_h());
3667 JVM_END
3668
3669 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3670 return os::get_signal_number(name);
3671 JVM_END