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