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/referenceType.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.hpp"
44 #include "oops/access.inline.hpp"
45 #include "oops/fieldStreams.hpp"
46 #include "oops/instanceKlass.hpp"
47 #include "oops/method.hpp"
48 #include "oops/objArrayKlass.hpp"
49 #include "oops/objArrayOop.inline.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "prims/jvm_misc.hpp"
52 #include "prims/jvmtiExport.hpp"
53 #include "prims/jvmtiThreadState.hpp"
54 #include "prims/nativeLookup.hpp"
55 #include "prims/privilegedStack.hpp"
56 #include "prims/stackwalk.hpp"
57 #include "runtime/arguments.hpp"
58 #include "runtime/atomic.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/init.hpp"
61 #include "runtime/interfaceSupport.inline.hpp"
62 #include "runtime/java.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/jfieldIDWorkaround.hpp"
65 #include "runtime/jniHandles.inline.hpp"
66 #include "runtime/orderAccess.inline.hpp"
67 #include "runtime/os.inline.hpp"
68 #include "runtime/perfData.hpp"
69 #include "runtime/reflection.hpp"
70 #include "runtime/thread.inline.hpp"
71 #include "runtime/threadSMR.hpp"
72 #include "runtime/vframe.inline.hpp"
73 #include "runtime/vm_operations.hpp"
74 #include "runtime/vm_version.hpp"
75 #include "services/attachListener.hpp"
76 #include "services/management.hpp"
77 #include "services/threadService.hpp"
78 #include "trace/tracing.hpp"
79 #include "utilities/copy.hpp"
80 #include "utilities/defaultStream.hpp"
81 #include "utilities/dtrace.hpp"
82 #include "utilities/events.hpp"
83 #include "utilities/histogram.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/utf8.hpp"
86 #if INCLUDE_CDS
87 #include "classfile/systemDictionaryShared.hpp"
88 #endif
89
90 #include <errno.h>
91
92 /*
93 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
94 such ctors and calls MUST NOT come between an oop declaration/init and its
95 usage because if objects are move this may cause various memory stomps, bus
96 errors and segfaults. Here is a cookbook for causing so called "naked oop
97 failures":
98
99 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
100 JVMWrapper("JVM_GetClassDeclaredFields");
101
102 // Object address to be held directly in mirror & not visible to GC
103 oop mirror = JNIHandles::resolve_non_null(ofClass);
104
105 // If this ctor can hit a safepoint, moving objects around, then
106 ComplexConstructor foo;
107
108 // Boom! mirror may point to JUNK instead of the intended object
109 (some dereference of mirror)
110
111 // Here's another call that may block for GC, making mirror stale
112 MutexLocker ml(some_lock);
113
114 // And here's an initializer that can result in a stale oop
115 // all in one step.
116 oop o = call_that_can_throw_exception(TRAPS);
117
118
119 The solution is to keep the oop declaration BELOW the ctor or function
120 call that might cause a GC, do another resolve to reassign the oop, or
121 consider use of a Handle instead of an oop so there is immunity from object
122 motion. But note that the "QUICK" entries below do not have a handlemark
123 and thus can only support use of handles passed in.
124 */
125
126 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
127 ResourceMark rm;
128 int line_number = -1;
129 const char * source_file = NULL;
130 const char * trace = "explicit";
131 InstanceKlass* caller = NULL;
132 JavaThread* jthread = JavaThread::current();
133 if (jthread->has_last_Java_frame()) {
134 vframeStream vfst(jthread);
135
136 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
137 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
138 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
139 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
140 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
141
142 Method* last_caller = NULL;
143
144 while (!vfst.at_end()) {
145 Method* m = vfst.method();
146 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
147 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
148 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
149 break;
150 }
151 last_caller = m;
152 vfst.next();
153 }
154 // if this is called from Class.forName0 and that is called from Class.forName,
155 // then print the caller of Class.forName. If this is Class.loadClass, then print
156 // that caller, otherwise keep quiet since this should be picked up elsewhere.
157 bool found_it = false;
158 if (!vfst.at_end() &&
159 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
160 vfst.method()->name() == vmSymbols::forName0_name()) {
161 vfst.next();
162 if (!vfst.at_end() &&
163 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
164 vfst.method()->name() == vmSymbols::forName_name()) {
165 vfst.next();
166 found_it = true;
167 }
168 } else if (last_caller != NULL &&
169 last_caller->method_holder()->name() ==
170 vmSymbols::java_lang_ClassLoader() &&
171 last_caller->name() == vmSymbols::loadClass_name()) {
172 found_it = true;
173 } else if (!vfst.at_end()) {
174 if (vfst.method()->is_native()) {
175 // JNI call
176 found_it = true;
177 }
178 }
179 if (found_it && !vfst.at_end()) {
180 // found the caller
181 caller = vfst.method()->method_holder();
182 line_number = vfst.method()->line_number_from_bci(vfst.bci());
183 if (line_number == -1) {
184 // show method name if it's a native method
185 trace = vfst.method()->name_and_sig_as_C_string();
186 }
187 Symbol* s = caller->source_file_name();
188 if (s != NULL) {
189 source_file = s->as_C_string();
190 }
191 }
192 }
193 if (caller != NULL) {
194 if (to_class != caller) {
195 const char * from = caller->external_name();
196 const char * to = to_class->external_name();
197 // print in a single call to reduce interleaving between threads
198 if (source_file != NULL) {
199 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
200 } else {
201 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
202 }
203 }
204 }
205 }
206
207 void trace_class_resolution(Klass* to_class) {
208 EXCEPTION_MARK;
209 trace_class_resolution_impl(to_class, THREAD);
210 if (HAS_PENDING_EXCEPTION) {
211 CLEAR_PENDING_EXCEPTION;
212 }
213 }
214
215 // Wrapper to trace JVM functions
216
217 #ifdef ASSERT
218 Histogram* JVMHistogram;
219 volatile int JVMHistogram_lock = 0;
220
221 class JVMHistogramElement : public HistogramElement {
222 public:
223 JVMHistogramElement(const char* name);
224 };
225
226 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
227 _name = elementName;
228 uintx count = 0;
229
230 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
231 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
232 count +=1;
233 if ( (WarnOnStalledSpinLock > 0)
234 && (count % WarnOnStalledSpinLock == 0)) {
235 warning("JVMHistogram_lock seems to be stalled");
236 }
237 }
238 }
239
240 if(JVMHistogram == NULL)
241 JVMHistogram = new Histogram("JVM Call Counts",100);
242
243 JVMHistogram->add_element(this);
244 Atomic::dec(&JVMHistogram_lock);
245 }
246
247 #define JVMCountWrapper(arg) \
248 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
249 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
250
251 #define JVMWrapper(arg) JVMCountWrapper(arg);
252 #else
253 #define JVMWrapper(arg)
254 #endif
255
256
257 // Interface version /////////////////////////////////////////////////////////////////////
258
259
260 JVM_LEAF(jint, JVM_GetInterfaceVersion())
261 return JVM_INTERFACE_VERSION;
262 JVM_END
263
264
265 // java.lang.System //////////////////////////////////////////////////////////////////////
266
267
268 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
269 JVMWrapper("JVM_CurrentTimeMillis");
270 return os::javaTimeMillis();
271 JVM_END
272
273 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
274 JVMWrapper("JVM_NanoTime");
275 return os::javaTimeNanos();
276 JVM_END
277
278 // The function below is actually exposed by jdk.internal.misc.VM and not
279 // java.lang.System, but we choose to keep it here so that it stays next
280 // to JVM_CurrentTimeMillis and JVM_NanoTime
281
282 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
283 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
284
285 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
286 JVMWrapper("JVM_GetNanoTimeAdjustment");
287 jlong seconds;
288 jlong nanos;
289
290 os::javaTimeSystemUTC(seconds, nanos);
291
292 // We're going to verify that the result can fit in a long.
293 // For that we need the difference in seconds between 'seconds'
294 // and 'offset_secs' to be such that:
295 // |seconds - offset_secs| < (2^63/10^9)
296 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
297 // which makes |seconds - offset_secs| < 2^33
298 // and we will prefer +/- 2^32 as the maximum acceptable diff
299 // as 2^32 has a more natural feel than 2^33...
300 //
301 // So if |seconds - offset_secs| >= 2^32 - we return a special
302 // sentinel value (-1) which the caller should take as an
303 // exception value indicating that the offset given to us is
304 // too far from range of the current time - leading to too big
305 // a nano adjustment. The caller is expected to recover by
306 // computing a more accurate offset and calling this method
307 // again. (For the record 2^32 secs is ~136 years, so that
308 // should rarely happen)
309 //
310 jlong diff = seconds - offset_secs;
311 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
312 return -1; // sentinel value: the offset is too far off the target
313 }
314
315 // return the adjustment. If you compute a time by adding
316 // this number of nanoseconds along with the number of seconds
317 // in the offset you should get the current UTC time.
318 return (diff * (jlong)1000000000) + nanos;
319 JVM_END
320
321 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
322 jobject dst, jint dst_pos, jint length))
323 JVMWrapper("JVM_ArrayCopy");
324 // Check if we have null pointers
325 if (src == NULL || dst == NULL) {
326 THROW(vmSymbols::java_lang_NullPointerException());
327 }
328 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
329 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
330 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
331 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
332 // Do copy
333 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
334 JVM_END
335
336
337 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
338 JavaValue r(T_OBJECT);
339 // public synchronized Object put(Object key, Object value);
340 HandleMark hm(THREAD);
341 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
342 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
343 JavaCalls::call_virtual(&r,
344 props,
345 SystemDictionary::Properties_klass(),
346 vmSymbols::put_name(),
347 vmSymbols::object_object_object_signature(),
348 key_str,
349 value_str,
350 THREAD);
351 }
352
353
354 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
355
356
357 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
358 JVMWrapper("JVM_InitProperties");
359 ResourceMark rm;
360
361 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
362
363 // System property list includes both user set via -D option and
364 // jvm system specific properties.
365 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
366 PUTPROP(props, p->key(), p->value());
367 }
368
369 // Convert the -XX:MaxDirectMemorySize= command line flag
370 // to the sun.nio.MaxDirectMemorySize property.
371 // Do this after setting user properties to prevent people
372 // from setting the value with a -D option, as requested.
373 {
374 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
375 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
376 } else {
377 char as_chars[256];
378 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
379 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
380 }
381 }
382
383 // JVM monitoring and management support
384 // Add the sun.management.compiler property for the compiler's name
385 {
386 #undef CSIZE
387 #if defined(_LP64) || defined(_WIN64)
388 #define CSIZE "64-Bit "
389 #else
390 #define CSIZE
391 #endif // 64bit
392
393 #ifdef TIERED
394 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
395 #else
396 #if defined(COMPILER1)
397 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
398 #elif defined(COMPILER2)
399 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
400 #elif INCLUDE_JVMCI
401 #error "INCLUDE_JVMCI should imply TIERED"
402 #else
403 const char* compiler_name = "";
404 #endif // compilers
405 #endif // TIERED
406
407 if (*compiler_name != '\0' &&
408 (Arguments::mode() != Arguments::_int)) {
409 PUTPROP(props, "sun.management.compiler", compiler_name);
410 }
411 }
412
413 return properties;
414 JVM_END
415
416
417 /*
418 * Return the temporary directory that the VM uses for the attach
419 * and perf data files.
420 *
421 * It is important that this directory is well-known and the
422 * same for all VM instances. It cannot be affected by configuration
423 * variables such as java.io.tmpdir.
424 */
425 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
426 JVMWrapper("JVM_GetTemporaryDirectory");
427 HandleMark hm(THREAD);
428 const char* temp_dir = os::get_temp_directory();
429 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
430 return (jstring) JNIHandles::make_local(env, h());
431 JVM_END
432
433
434 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
435
436 extern volatile jint vm_created;
437
438 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
439 JVMWrapper("JVM_BeforeHalt");
440 EventShutdown event;
441 if (event.should_commit()) {
442 event.set_reason("Shutdown requested from Java");
443 event.commit();
444 }
445 JVM_END
446
447
448 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
449 before_exit(thread);
450 vm_exit(code);
451 JVM_END
452
453
454 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
455 JVMWrapper("JVM_GC");
456 if (!DisableExplicitGC) {
457 Universe::heap()->collect(GCCause::_java_lang_system_gc);
458 }
459 JVM_END
460
461
462 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
463 JVMWrapper("JVM_MaxObjectInspectionAge");
464 return Universe::heap()->millis_since_last_gc();
465 JVM_END
466
467
468 static inline jlong convert_size_t_to_jlong(size_t val) {
469 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
470 NOT_LP64 (return (jlong)val;)
471 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
472 }
473
474 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
475 JVMWrapper("JVM_TotalMemory");
476 size_t n = Universe::heap()->capacity();
477 return convert_size_t_to_jlong(n);
478 JVM_END
479
480
481 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
482 JVMWrapper("JVM_FreeMemory");
483 CollectedHeap* ch = Universe::heap();
484 size_t n;
485 {
486 MutexLocker x(Heap_lock);
487 n = ch->capacity() - ch->used();
488 }
489 return convert_size_t_to_jlong(n);
490 JVM_END
491
492
493 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
494 JVMWrapper("JVM_MaxMemory");
495 size_t n = Universe::heap()->max_capacity();
496 return convert_size_t_to_jlong(n);
497 JVM_END
498
499
500 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
501 JVMWrapper("JVM_ActiveProcessorCount");
502 return os::active_processor_count();
503 JVM_END
504
505
506
507 // java.lang.Throwable //////////////////////////////////////////////////////
508
509
510 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
511 JVMWrapper("JVM_FillInStackTrace");
512 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
513 java_lang_Throwable::fill_in_stack_trace(exception);
514 JVM_END
515
516
517 // java.lang.StackTraceElement //////////////////////////////////////////////
518
519
520 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
521 JVMWrapper("JVM_InitStackTraceElementArray");
522 Handle exception(THREAD, JNIHandles::resolve(throwable));
523 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
524 objArrayHandle stack_trace(THREAD, st);
525 // Fill in the allocated stack trace
526 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
527 JVM_END
528
529
530 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
531 JVMWrapper("JVM_InitStackTraceElement");
532 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
533 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
534 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
535 JVM_END
536
537
538 // java.lang.StackWalker //////////////////////////////////////////////////////
539
540
541 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
542 jint skip_frames, jint frame_count, jint start_index,
543 jobjectArray frames))
544 JVMWrapper("JVM_CallStackWalk");
545 JavaThread* jt = (JavaThread*) THREAD;
546 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
547 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
548 }
549
550 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
551
552 // frames array is a Class<?>[] array when only getting caller reference,
553 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
554 // be null.
555 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
556 objArrayHandle frames_array_h(THREAD, fa);
557
558 int limit = start_index + frame_count;
559 if (frames_array_h->length() < limit) {
560 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
561 }
562
563 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
564 start_index, frames_array_h, CHECK_NULL);
565 return JNIHandles::make_local(env, result);
566 JVM_END
567
568
569 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
570 jint frame_count, jint start_index,
571 jobjectArray frames))
572 JVMWrapper("JVM_MoreStackWalk");
573 JavaThread* jt = (JavaThread*) THREAD;
574
575 // frames array is a Class<?>[] array when only getting caller reference,
576 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
577 // be null.
578 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
579 objArrayHandle frames_array_h(THREAD, fa);
580
581 int limit = start_index+frame_count;
582 if (frames_array_h->length() < limit) {
583 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
584 }
585
586 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
587 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
588 start_index, frames_array_h, THREAD);
589 JVM_END
590
591 // java.lang.Object ///////////////////////////////////////////////
592
593
594 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
595 JVMWrapper("JVM_IHashCode");
596 // as implemented in the classic virtual machine; return 0 if object is NULL
597 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
598 JVM_END
599
600
601 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
602 JVMWrapper("JVM_MonitorWait");
603 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
604 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
605 if (JvmtiExport::should_post_monitor_wait()) {
606 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
607
608 // The current thread already owns the monitor and it has not yet
609 // been added to the wait queue so the current thread cannot be
610 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
611 // event handler cannot accidentally consume an unpark() meant for
612 // the ParkEvent associated with this ObjectMonitor.
613 }
614 ObjectSynchronizer::wait(obj, ms, CHECK);
615 JVM_END
616
617
618 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
619 JVMWrapper("JVM_MonitorNotify");
620 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
621 ObjectSynchronizer::notify(obj, CHECK);
622 JVM_END
623
624
625 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
626 JVMWrapper("JVM_MonitorNotifyAll");
627 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
628 ObjectSynchronizer::notifyall(obj, CHECK);
629 JVM_END
630
631
632 template<DecoratorSet decorators>
633 static void fixup_clone_referent(oop src, oop new_obj) {
634 typedef HeapAccess<decorators> RefAccess;
635 const int ref_offset = java_lang_ref_Reference::referent_offset;
636 oop referent = RefAccess::oop_load_at(src, ref_offset);
637 RefAccess::oop_store_at(new_obj, ref_offset, referent);
638 }
639
640 static void fixup_cloned_reference(ReferenceType ref_type, oop src, oop clone) {
641 // Kludge: After unbarriered clone, re-copy the referent with
642 // correct barriers. This works for current collectors, but won't
643 // work for ZGC and maybe other future collectors or variants of
644 // existing ones (like G1 with concurrent reference processing).
645 if (ref_type == REF_PHANTOM) {
646 fixup_clone_referent<ON_PHANTOM_OOP_REF>(src, clone);
647 } else {
648 fixup_clone_referent<ON_WEAK_OOP_REF>(src, clone);
649 }
650 if ((java_lang_ref_Reference::next(clone) != NULL) ||
651 (java_lang_ref_Reference::queue(clone) == java_lang_ref_ReferenceQueue::ENQUEUED_queue())) {
652 // If the source has been enqueued or is being enqueued, don't
653 // register the clone with a queue.
654 java_lang_ref_Reference::set_queue(clone, java_lang_ref_ReferenceQueue::NULL_queue());
655 }
656 // discovered and next are list links; the clone is not in those lists.
657 java_lang_ref_Reference::set_discovered(clone, NULL);
658 java_lang_ref_Reference::set_next(clone, NULL);
659 }
660
661 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
662 JVMWrapper("JVM_Clone");
663 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
664 Klass* klass = obj->klass();
665 JvmtiVMObjectAllocEventCollector oam;
666
667 #ifdef ASSERT
668 // Just checking that the cloneable flag is set correct
669 if (obj->is_array()) {
670 guarantee(klass->is_cloneable(), "all arrays are cloneable");
671 } else {
672 guarantee(obj->is_instance(), "should be instanceOop");
673 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
674 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
675 }
676 #endif
677
678 // Check if class of obj supports the Cloneable interface.
679 // All arrays are considered to be cloneable (See JLS 20.1.5)
680 if (!klass->is_cloneable()) {
681 ResourceMark rm(THREAD);
682 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
683 }
684
685 // Make shallow object copy
686 ReferenceType ref_type = REF_NONE;
687 const int size = obj->size();
688 oop new_obj_oop = NULL;
689 if (obj->is_array()) {
690 const int length = ((arrayOop)obj())->length();
691 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
692 } else {
693 ref_type = InstanceKlass::cast(klass)->reference_type();
694 assert((ref_type == REF_NONE) ==
695 !klass->is_subclass_of(SystemDictionary::Reference_klass()),
696 "invariant");
697 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
698 }
699
700 HeapAccess<>::clone(obj(), new_obj_oop, size);
701
702 // If cloning a Reference, set Reference fields to a safe state.
703 // Fixup must be completed before any safepoint.
704 if (ref_type != REF_NONE) {
705 fixup_cloned_reference(ref_type, obj(), new_obj_oop);
706 }
707
708 Handle new_obj(THREAD, new_obj_oop);
709 // Caution: this involves a java upcall, so the clone should be
710 // "gc-robust" by this stage.
711 if (klass->has_finalizer()) {
712 assert(obj->is_instance(), "should be instanceOop");
713 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
714 new_obj = Handle(THREAD, new_obj_oop);
715 }
716
717 return JNIHandles::make_local(env, new_obj());
718 JVM_END
719
720 // java.io.File ///////////////////////////////////////////////////////////////
721
722 JVM_LEAF(char*, JVM_NativePath(char* path))
723 JVMWrapper("JVM_NativePath");
724 return os::native_path(path);
725 JVM_END
726
727
728 // Misc. class handling ///////////////////////////////////////////////////////////
729
730
731 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
732 JVMWrapper("JVM_GetCallerClass");
733
734 // Getting the class of the caller frame.
735 //
736 // The call stack at this point looks something like this:
737 //
738 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
739 // [1] [ @CallerSensitive API.method ]
740 // [.] [ (skipped intermediate frames) ]
741 // [n] [ caller ]
742 vframeStream vfst(thread);
743 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
744 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
745 Method* m = vfst.method();
746 assert(m != NULL, "sanity");
747 switch (n) {
748 case 0:
749 // This must only be called from Reflection.getCallerClass
750 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
751 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
752 }
753 // fall-through
754 case 1:
755 // Frame 0 and 1 must be caller sensitive.
756 if (!m->caller_sensitive()) {
757 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
758 }
759 break;
760 default:
761 if (!m->is_ignored_by_security_stack_walk()) {
762 // We have reached the desired frame; return the holder class.
763 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
764 }
765 break;
766 }
767 }
768 return NULL;
769 JVM_END
770
771
772 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
773 JVMWrapper("JVM_FindPrimitiveClass");
774 oop mirror = NULL;
775 BasicType t = name2type(utf);
776 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
777 mirror = Universe::java_mirror(t);
778 }
779 if (mirror == NULL) {
780 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
781 } else {
782 return (jclass) JNIHandles::make_local(env, mirror);
783 }
784 JVM_END
785
786
787 // Returns a class loaded by the bootstrap class loader; or null
788 // if not found. ClassNotFoundException is not thrown.
789 // FindClassFromBootLoader is exported to the launcher for windows.
790 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
791 const char* name))
792 JVMWrapper("JVM_FindClassFromBootLoader");
793
794 // Java libraries should ensure that name is never null...
795 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
796 // It's impossible to create this class; the name cannot fit
797 // into the constant pool.
798 return NULL;
799 }
800
801 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
802 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
803 if (k == NULL) {
804 return NULL;
805 }
806
807 if (log_is_enabled(Debug, class, resolve)) {
808 trace_class_resolution(k);
809 }
810 return (jclass) JNIHandles::make_local(env, k->java_mirror());
811 JVM_END
812
813 // Find a class with this name in this loader, using the caller's protection domain.
814 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
815 jboolean init, jobject loader,
816 jclass caller))
817 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
818 // Java libraries should ensure that name is never null...
819 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
820 // It's impossible to create this class; the name cannot fit
821 // into the constant pool.
822 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
823 }
824
825 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
826
827 oop loader_oop = JNIHandles::resolve(loader);
828 oop from_class = JNIHandles::resolve(caller);
829 oop protection_domain = NULL;
830 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
831 // NPE. Put it in another way, the bootstrap class loader has all permission and
832 // thus no checkPackageAccess equivalence in the VM class loader.
833 // The caller is also passed as NULL by the java code if there is no security
834 // manager to avoid the performance cost of getting the calling class.
835 if (from_class != NULL && loader_oop != NULL) {
836 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
837 }
838
839 Handle h_loader(THREAD, loader_oop);
840 Handle h_prot(THREAD, protection_domain);
841 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
842 h_prot, false, THREAD);
843
844 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
845 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
846 }
847 return result;
848 JVM_END
849
850 // Currently only called from the old verifier.
851 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
852 jboolean init, jclass from))
853 JVMWrapper("JVM_FindClassFromClass");
854 if (name == NULL) {
855 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
856 }
857 if ((int)strlen(name) > Symbol::max_length()) {
858 // It's impossible to create this class; the name cannot fit
859 // into the constant pool.
860 Exceptions::fthrow(THREAD_AND_LOCATION,
861 vmSymbols::java_lang_NoClassDefFoundError(),
862 "Class name exceeds maximum length of %d: %s",
863 Symbol::max_length(),
864 name);
865 return 0;
866 }
867 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
868 oop from_class_oop = JNIHandles::resolve(from);
869 Klass* from_class = (from_class_oop == NULL)
870 ? (Klass*)NULL
871 : java_lang_Class::as_Klass(from_class_oop);
872 oop class_loader = NULL;
873 oop protection_domain = NULL;
874 if (from_class != NULL) {
875 class_loader = from_class->class_loader();
876 protection_domain = from_class->protection_domain();
877 }
878 Handle h_loader(THREAD, class_loader);
879 Handle h_prot (THREAD, protection_domain);
880 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
881 h_prot, true, thread);
882 if (result != NULL) {
883 oop mirror = JNIHandles::resolve_non_null(result);
884 Klass* to_class = java_lang_Class::as_Klass(mirror);
885 ClassLoaderData::class_loader_data(h_loader())->record_dependency(to_class);
886 }
887
888 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
889 // this function is generally only used for class loading during verification.
890 ResourceMark rm;
891 oop from_mirror = JNIHandles::resolve_non_null(from);
892 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
893 const char * from_name = from_class->external_name();
894
895 oop mirror = JNIHandles::resolve_non_null(result);
896 Klass* to_class = java_lang_Class::as_Klass(mirror);
897 const char * to = to_class->external_name();
898 log_debug(class, resolve)("%s %s (verification)", from_name, to);
899 }
900
901 return result;
902 JVM_END
903
904 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
905 if (loader.is_null()) {
906 return;
907 }
908
909 // check whether the current caller thread holds the lock or not.
910 // If not, increment the corresponding counter
911 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
912 ObjectSynchronizer::owner_self) {
913 counter->inc();
914 }
915 }
916
917 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
918 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
919 jobject loader, const jbyte *buf,
920 jsize len, jobject pd, const char *source,
921 TRAPS) {
922 if (source == NULL) source = "__JVM_DefineClass__";
923
924 assert(THREAD->is_Java_thread(), "must be a JavaThread");
925 JavaThread* jt = (JavaThread*) THREAD;
926
927 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
928 ClassLoader::perf_define_appclass_selftime(),
929 ClassLoader::perf_define_appclasses(),
930 jt->get_thread_stat()->perf_recursion_counts_addr(),
931 jt->get_thread_stat()->perf_timers_addr(),
932 PerfClassTraceTime::DEFINE_CLASS);
933
934 if (UsePerfData) {
935 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
936 }
937
938 // Since exceptions can be thrown, class initialization can take place
939 // if name is NULL no check for class name in .class stream has to be made.
940 TempNewSymbol class_name = NULL;
941 if (name != NULL) {
942 const int str_len = (int)strlen(name);
943 if (str_len > Symbol::max_length()) {
944 // It's impossible to create this class; the name cannot fit
945 // into the constant pool.
946 Exceptions::fthrow(THREAD_AND_LOCATION,
947 vmSymbols::java_lang_NoClassDefFoundError(),
948 "Class name exceeds maximum length of %d: %s",
949 Symbol::max_length(),
950 name);
951 return 0;
952 }
953 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
954 }
955
956 ResourceMark rm(THREAD);
957 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
958 Handle class_loader (THREAD, JNIHandles::resolve(loader));
959 if (UsePerfData) {
960 is_lock_held_by_thread(class_loader,
961 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
962 THREAD);
963 }
964 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
965 Klass* k = SystemDictionary::resolve_from_stream(class_name,
966 class_loader,
967 protection_domain,
968 &st,
969 CHECK_NULL);
970
971 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
972 trace_class_resolution(k);
973 }
974
975 return (jclass) JNIHandles::make_local(env, k->java_mirror());
976 }
977
978
979 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
980 JVMWrapper("JVM_DefineClass");
981
982 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
983 JVM_END
984
985
986 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
987 JVMWrapper("JVM_DefineClassWithSource");
988
989 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
990 JVM_END
991
992 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
993 JVMWrapper("JVM_FindLoadedClass");
994 ResourceMark rm(THREAD);
995
996 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
997 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
998
999 const char* str = java_lang_String::as_utf8_string(string());
1000 // Sanity check, don't expect null
1001 if (str == NULL) return NULL;
1002
1003 const int str_len = (int)strlen(str);
1004 if (str_len > Symbol::max_length()) {
1005 // It's impossible to create this class; the name cannot fit
1006 // into the constant pool.
1007 return NULL;
1008 }
1009 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
1010
1011 // Security Note:
1012 // The Java level wrapper will perform the necessary security check allowing
1013 // us to pass the NULL as the initiating class loader.
1014 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1015 if (UsePerfData) {
1016 is_lock_held_by_thread(h_loader,
1017 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1018 THREAD);
1019 }
1020
1021 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1022 h_loader,
1023 Handle(),
1024 CHECK_NULL);
1025 #if INCLUDE_CDS
1026 if (k == NULL) {
1027 // If the class is not already loaded, try to see if it's in the shared
1028 // archive for the current classloader (h_loader).
1029 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1030 }
1031 #endif
1032 return (k == NULL) ? NULL :
1033 (jclass) JNIHandles::make_local(env, k->java_mirror());
1034 JVM_END
1035
1036 // Module support //////////////////////////////////////////////////////////////////////////////
1037
1038 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1039 jstring location, const char* const* packages, jsize num_packages))
1040 JVMWrapper("JVM_DefineModule");
1041 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1042 JVM_END
1043
1044 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1045 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1046 Modules::set_bootloader_unnamed_module(module, CHECK);
1047 JVM_END
1048
1049 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1050 JVMWrapper("JVM_AddModuleExports");
1051 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1052 JVM_END
1053
1054 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1055 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1056 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1057 JVM_END
1058
1059 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1060 JVMWrapper("JVM_AddModuleExportsToAll");
1061 Modules::add_module_exports(from_module, package, NULL, CHECK);
1062 JVM_END
1063
1064 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1065 JVMWrapper("JVM_AddReadsModule");
1066 Modules::add_reads_module(from_module, source_module, CHECK);
1067 JVM_END
1068
1069 // Reflection support //////////////////////////////////////////////////////////////////////////////
1070
1071 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1072 assert (cls != NULL, "illegal class");
1073 JVMWrapper("JVM_GetClassName");
1074 JvmtiVMObjectAllocEventCollector oam;
1075 ResourceMark rm(THREAD);
1076 const char* name;
1077 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1078 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1079 } else {
1080 // Consider caching interned string in Klass
1081 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1082 assert(k->is_klass(), "just checking");
1083 name = k->external_name();
1084 }
1085 oop result = StringTable::intern((char*) name, CHECK_NULL);
1086 return (jstring) JNIHandles::make_local(env, result);
1087 JVM_END
1088
1089
1090 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1091 JVMWrapper("JVM_GetClassInterfaces");
1092 JvmtiVMObjectAllocEventCollector oam;
1093 oop mirror = JNIHandles::resolve_non_null(cls);
1094
1095 // Special handling for primitive objects
1096 if (java_lang_Class::is_primitive(mirror)) {
1097 // Primitive objects does not have any interfaces
1098 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1099 return (jobjectArray) JNIHandles::make_local(env, r);
1100 }
1101
1102 Klass* klass = java_lang_Class::as_Klass(mirror);
1103 // Figure size of result array
1104 int size;
1105 if (klass->is_instance_klass()) {
1106 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1107 } else {
1108 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1109 size = 2;
1110 }
1111
1112 // Allocate result array
1113 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1114 objArrayHandle result (THREAD, r);
1115 // Fill in result
1116 if (klass->is_instance_klass()) {
1117 // Regular instance klass, fill in all local interfaces
1118 for (int index = 0; index < size; index++) {
1119 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1120 result->obj_at_put(index, k->java_mirror());
1121 }
1122 } else {
1123 // All arrays implement java.lang.Cloneable and java.io.Serializable
1124 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1125 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1126 }
1127 return (jobjectArray) JNIHandles::make_local(env, result());
1128 JVM_END
1129
1130
1131 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1132 JVMWrapper("JVM_IsInterface");
1133 oop mirror = JNIHandles::resolve_non_null(cls);
1134 if (java_lang_Class::is_primitive(mirror)) {
1135 return JNI_FALSE;
1136 }
1137 Klass* k = java_lang_Class::as_Klass(mirror);
1138 jboolean result = k->is_interface();
1139 assert(!result || k->is_instance_klass(),
1140 "all interfaces are instance types");
1141 // The compiler intrinsic for isInterface tests the
1142 // Klass::_access_flags bits in the same way.
1143 return result;
1144 JVM_END
1145
1146
1147 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1148 JVMWrapper("JVM_GetClassSigners");
1149 JvmtiVMObjectAllocEventCollector oam;
1150 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1151 // There are no signers for primitive types
1152 return NULL;
1153 }
1154
1155 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1156
1157 // If there are no signers set in the class, or if the class
1158 // is an array, return NULL.
1159 if (signers == NULL) return NULL;
1160
1161 // copy of the signers array
1162 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1163 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1164 for (int index = 0; index < signers->length(); index++) {
1165 signers_copy->obj_at_put(index, signers->obj_at(index));
1166 }
1167
1168 // return the copy
1169 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1170 JVM_END
1171
1172
1173 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1174 JVMWrapper("JVM_SetClassSigners");
1175 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1176 // This call is ignored for primitive types and arrays.
1177 // Signers are only set once, ClassLoader.java, and thus shouldn't
1178 // be called with an array. Only the bootstrap loader creates arrays.
1179 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1180 if (k->is_instance_klass()) {
1181 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1182 }
1183 }
1184 JVM_END
1185
1186
1187 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1188 JVMWrapper("JVM_GetProtectionDomain");
1189 if (JNIHandles::resolve(cls) == NULL) {
1190 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1191 }
1192
1193 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1194 // Primitive types does not have a protection domain.
1195 return NULL;
1196 }
1197
1198 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1199 return (jobject) JNIHandles::make_local(env, pd);
1200 JVM_END
1201
1202
1203 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) {
1204 // If there is a security manager and protection domain, check the access
1205 // in the protection domain, otherwise it is authorized.
1206 if (java_lang_System::has_security_manager()) {
1207
1208 // For bootstrapping, if pd implies method isn't in the JDK, allow
1209 // this context to revert to older behavior.
1210 // In this case the isAuthorized field in AccessControlContext is also not
1211 // present.
1212 if (Universe::protection_domain_implies_method() == NULL) {
1213 return true;
1214 }
1215
1216 // Whitelist certain access control contexts
1217 if (java_security_AccessControlContext::is_authorized(context)) {
1218 return true;
1219 }
1220
1221 oop prot = klass->protection_domain();
1222 if (prot != NULL) {
1223 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1224 // in the new wrapper.
1225 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1226 Handle h_prot(THREAD, prot);
1227 JavaValue result(T_BOOLEAN);
1228 JavaCallArguments args(h_prot);
1229 JavaCalls::call(&result, m, &args, CHECK_false);
1230 return (result.get_jboolean() != 0);
1231 }
1232 }
1233 return true;
1234 }
1235
1236 // Create an AccessControlContext with a protection domain with null codesource
1237 // and null permissions - which gives no permissions.
1238 oop create_dummy_access_control_context(TRAPS) {
1239 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1240 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1241 // Call constructor ProtectionDomain(null, null);
1242 JavaValue result(T_VOID);
1243 JavaCalls::call_special(&result, obj, pd_klass,
1244 vmSymbols::object_initializer_name(),
1245 vmSymbols::codesource_permissioncollection_signature(),
1246 Handle(), Handle(), CHECK_NULL);
1247
1248 // new ProtectionDomain[] {pd};
1249 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1250 context->obj_at_put(0, obj());
1251
1252 // new AccessControlContext(new ProtectionDomain[] {pd})
1253 objArrayHandle h_context(THREAD, context);
1254 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1255 return acc;
1256 }
1257
1258 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1259 JVMWrapper("JVM_DoPrivileged");
1260
1261 if (action == NULL) {
1262 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1263 }
1264
1265 // Compute the frame initiating the do privileged operation and setup the privileged stack
1266 vframeStream vfst(thread);
1267 vfst.security_get_caller_frame(1);
1268
1269 if (vfst.at_end()) {
1270 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1271 }
1272
1273 Method* method = vfst.method();
1274 InstanceKlass* klass = method->method_holder();
1275
1276 // Check that action object understands "Object run()"
1277 Handle h_context;
1278 if (context != NULL) {
1279 h_context = Handle(THREAD, JNIHandles::resolve(context));
1280 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1281 if (!authorized) {
1282 // Create an unprivileged access control object and call it's run function
1283 // instead.
1284 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1285 h_context = Handle(THREAD, noprivs);
1286 }
1287 }
1288
1289 // Check that action object understands "Object run()"
1290 Handle object (THREAD, JNIHandles::resolve(action));
1291
1292 // get run() method
1293 Method* m_oop = object->klass()->uncached_lookup_method(
1294 vmSymbols::run_method_name(),
1295 vmSymbols::void_object_signature(),
1296 Klass::find_overpass);
1297
1298 // See if there is a default method for "Object run()".
1299 if (m_oop == NULL && object->klass()->is_instance_klass()) {
1300 InstanceKlass* iklass = InstanceKlass::cast(object->klass());
1301 m_oop = iklass->lookup_method_in_ordered_interfaces(
1302 vmSymbols::run_method_name(),
1303 vmSymbols::void_object_signature());
1304 }
1305
1306 methodHandle m (THREAD, m_oop);
1307 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) {
1308 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1309 }
1310
1311 // Stack allocated list of privileged stack elements
1312 PrivilegedElement pi;
1313 if (!vfst.at_end()) {
1314 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1315 thread->set_privileged_stack_top(&pi);
1316 }
1317
1318
1319 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1320 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1321 Handle pending_exception;
1322 JavaValue result(T_OBJECT);
1323 JavaCallArguments args(object);
1324 JavaCalls::call(&result, m, &args, THREAD);
1325
1326 // done with action, remove ourselves from the list
1327 if (!vfst.at_end()) {
1328 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1329 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1330 }
1331
1332 if (HAS_PENDING_EXCEPTION) {
1333 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1334 CLEAR_PENDING_EXCEPTION;
1335 // JVMTI has already reported the pending exception
1336 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1337 if (THREAD->is_Java_thread()) {
1338 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1339 }
1340 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1341 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1342 // Throw a java.security.PrivilegedActionException(Exception e) exception
1343 JavaCallArguments args(pending_exception);
1344 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1345 vmSymbols::exception_void_signature(),
1346 &args);
1347 }
1348 }
1349
1350 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1351 return JNIHandles::make_local(env, (oop) result.get_jobject());
1352 JVM_END
1353
1354
1355 // Returns the inherited_access_control_context field of the running thread.
1356 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1357 JVMWrapper("JVM_GetInheritedAccessControlContext");
1358 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1359 return JNIHandles::make_local(env, result);
1360 JVM_END
1361
1362 class RegisterArrayForGC {
1363 private:
1364 JavaThread *_thread;
1365 public:
1366 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1367 _thread = thread;
1368 _thread->register_array_for_gc(array);
1369 }
1370
1371 ~RegisterArrayForGC() {
1372 _thread->register_array_for_gc(NULL);
1373 }
1374 };
1375
1376
1377 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1378 JVMWrapper("JVM_GetStackAccessControlContext");
1379 if (!UsePrivilegedStack) return NULL;
1380
1381 ResourceMark rm(THREAD);
1382 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1383 JvmtiVMObjectAllocEventCollector oam;
1384
1385 // count the protection domains on the execution stack. We collapse
1386 // duplicate consecutive protection domains into a single one, as
1387 // well as stopping when we hit a privileged frame.
1388
1389 // Use vframeStream to iterate through Java frames
1390 vframeStream vfst(thread);
1391
1392 oop previous_protection_domain = NULL;
1393 Handle privileged_context(thread, NULL);
1394 bool is_privileged = false;
1395 oop protection_domain = NULL;
1396
1397 for(; !vfst.at_end(); vfst.next()) {
1398 // get method of frame
1399 Method* method = vfst.method();
1400 intptr_t* frame_id = vfst.frame_id();
1401
1402 // check the privileged frames to see if we have a match
1403 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1404 // this frame is privileged
1405 is_privileged = true;
1406 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1407 protection_domain = thread->privileged_stack_top()->protection_domain();
1408 } else {
1409 protection_domain = method->method_holder()->protection_domain();
1410 }
1411
1412 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) {
1413 local_array->push(protection_domain);
1414 previous_protection_domain = protection_domain;
1415 }
1416
1417 if (is_privileged) break;
1418 }
1419
1420
1421 // either all the domains on the stack were system domains, or
1422 // we had a privileged system domain
1423 if (local_array->is_empty()) {
1424 if (is_privileged && privileged_context.is_null()) return NULL;
1425
1426 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1427 return JNIHandles::make_local(env, result);
1428 }
1429
1430 // the resource area must be registered in case of a gc
1431 RegisterArrayForGC ragc(thread, local_array);
1432 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1433 local_array->length(), CHECK_NULL);
1434 objArrayHandle h_context(thread, context);
1435 for (int index = 0; index < local_array->length(); index++) {
1436 h_context->obj_at_put(index, local_array->at(index));
1437 }
1438
1439 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1440
1441 return JNIHandles::make_local(env, result);
1442 JVM_END
1443
1444
1445 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1446 JVMWrapper("JVM_IsArrayClass");
1447 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1448 return (k != NULL) && k->is_array_klass() ? true : false;
1449 JVM_END
1450
1451
1452 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1453 JVMWrapper("JVM_IsPrimitiveClass");
1454 oop mirror = JNIHandles::resolve_non_null(cls);
1455 return (jboolean) java_lang_Class::is_primitive(mirror);
1456 JVM_END
1457
1458
1459 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1460 JVMWrapper("JVM_GetClassModifiers");
1461 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1462 // Primitive type
1463 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1464 }
1465
1466 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1467 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1468 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1469 return k->modifier_flags();
1470 JVM_END
1471
1472
1473 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1474
1475 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1476 JvmtiVMObjectAllocEventCollector oam;
1477 // ofClass is a reference to a java_lang_Class object. The mirror object
1478 // of an InstanceKlass
1479
1480 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1481 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1482 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1483 return (jobjectArray)JNIHandles::make_local(env, result);
1484 }
1485
1486 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1487 InnerClassesIterator iter(k);
1488
1489 if (iter.length() == 0) {
1490 // Neither an inner nor outer class
1491 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1492 return (jobjectArray)JNIHandles::make_local(env, result);
1493 }
1494
1495 // find inner class info
1496 constantPoolHandle cp(thread, k->constants());
1497 int length = iter.length();
1498
1499 // Allocate temp. result array
1500 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1501 objArrayHandle result (THREAD, r);
1502 int members = 0;
1503
1504 for (; !iter.done(); iter.next()) {
1505 int ioff = iter.inner_class_info_index();
1506 int ooff = iter.outer_class_info_index();
1507
1508 if (ioff != 0 && ooff != 0) {
1509 // Check to see if the name matches the class we're looking for
1510 // before attempting to find the class.
1511 if (cp->klass_name_at_matches(k, ooff)) {
1512 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1513 if (outer_klass == k) {
1514 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1515 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1516
1517 // Throws an exception if outer klass has not declared k as
1518 // an inner klass
1519 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1520
1521 result->obj_at_put(members, inner_klass->java_mirror());
1522 members++;
1523 }
1524 }
1525 }
1526 }
1527
1528 if (members != length) {
1529 // Return array of right length
1530 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1531 for(int i = 0; i < members; i++) {
1532 res->obj_at_put(i, result->obj_at(i));
1533 }
1534 return (jobjectArray)JNIHandles::make_local(env, res);
1535 }
1536
1537 return (jobjectArray)JNIHandles::make_local(env, result());
1538 JVM_END
1539
1540
1541 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1542 {
1543 // ofClass is a reference to a java_lang_Class object.
1544 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1545 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1546 return NULL;
1547 }
1548
1549 bool inner_is_member = false;
1550 Klass* outer_klass
1551 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1552 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1553 if (outer_klass == NULL) return NULL; // already a top-level class
1554 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1555 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1556 }
1557 JVM_END
1558
1559 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1560 {
1561 oop mirror = JNIHandles::resolve_non_null(cls);
1562 if (java_lang_Class::is_primitive(mirror) ||
1563 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1564 return NULL;
1565 }
1566 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1567 int ooff = 0, noff = 0;
1568 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1569 if (noff != 0) {
1570 constantPoolHandle i_cp(thread, k->constants());
1571 Symbol* name = i_cp->symbol_at(noff);
1572 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1573 return (jstring) JNIHandles::make_local(env, str());
1574 }
1575 }
1576 return NULL;
1577 }
1578 JVM_END
1579
1580 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1581 assert (cls != NULL, "illegal class");
1582 JVMWrapper("JVM_GetClassSignature");
1583 JvmtiVMObjectAllocEventCollector oam;
1584 ResourceMark rm(THREAD);
1585 // Return null for arrays and primatives
1586 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1587 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1588 if (k->is_instance_klass()) {
1589 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1590 if (sym == NULL) return NULL;
1591 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1592 return (jstring) JNIHandles::make_local(env, str());
1593 }
1594 }
1595 return NULL;
1596 JVM_END
1597
1598
1599 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1600 assert (cls != NULL, "illegal class");
1601 JVMWrapper("JVM_GetClassAnnotations");
1602
1603 // Return null for arrays and primitives
1604 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1605 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1606 if (k->is_instance_klass()) {
1607 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1608 return (jbyteArray) JNIHandles::make_local(env, a);
1609 }
1610 }
1611 return NULL;
1612 JVM_END
1613
1614
1615 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1616 // some of this code was adapted from from jni_FromReflectedField
1617
1618 oop reflected = JNIHandles::resolve_non_null(field);
1619 oop mirror = java_lang_reflect_Field::clazz(reflected);
1620 Klass* k = java_lang_Class::as_Klass(mirror);
1621 int slot = java_lang_reflect_Field::slot(reflected);
1622 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1623
1624 InstanceKlass* ik = InstanceKlass::cast(k);
1625 intptr_t offset = ik->field_offset(slot);
1626
1627 if (modifiers & JVM_ACC_STATIC) {
1628 // for static fields we only look in the current class
1629 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1630 assert(false, "cannot find static field");
1631 return false;
1632 }
1633 } else {
1634 // for instance fields we start with the current class and work
1635 // our way up through the superclass chain
1636 if (!ik->find_field_from_offset(offset, false, &fd)) {
1637 assert(false, "cannot find instance field");
1638 return false;
1639 }
1640 }
1641 return true;
1642 }
1643
1644 static Method* jvm_get_method_common(jobject method) {
1645 // some of this code was adapted from from jni_FromReflectedMethod
1646
1647 oop reflected = JNIHandles::resolve_non_null(method);
1648 oop mirror = NULL;
1649 int slot = 0;
1650
1651 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1652 mirror = java_lang_reflect_Constructor::clazz(reflected);
1653 slot = java_lang_reflect_Constructor::slot(reflected);
1654 } else {
1655 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1656 "wrong type");
1657 mirror = java_lang_reflect_Method::clazz(reflected);
1658 slot = java_lang_reflect_Method::slot(reflected);
1659 }
1660 Klass* k = java_lang_Class::as_Klass(mirror);
1661
1662 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1663 assert(m != NULL, "cannot find method");
1664 return m; // caller has to deal with NULL in product mode
1665 }
1666
1667 /* Type use annotations support (JDK 1.8) */
1668
1669 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1670 assert (cls != NULL, "illegal class");
1671 JVMWrapper("JVM_GetClassTypeAnnotations");
1672 ResourceMark rm(THREAD);
1673 // Return null for arrays and primitives
1674 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1675 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1676 if (k->is_instance_klass()) {
1677 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1678 if (type_annotations != NULL) {
1679 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1680 return (jbyteArray) JNIHandles::make_local(env, a);
1681 }
1682 }
1683 }
1684 return NULL;
1685 JVM_END
1686
1687 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1688 assert (method != NULL, "illegal method");
1689 JVMWrapper("JVM_GetMethodTypeAnnotations");
1690
1691 // method is a handle to a java.lang.reflect.Method object
1692 Method* m = jvm_get_method_common(method);
1693 if (m == NULL) {
1694 return NULL;
1695 }
1696
1697 AnnotationArray* type_annotations = m->type_annotations();
1698 if (type_annotations != NULL) {
1699 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1700 return (jbyteArray) JNIHandles::make_local(env, a);
1701 }
1702
1703 return NULL;
1704 JVM_END
1705
1706 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1707 assert (field != NULL, "illegal field");
1708 JVMWrapper("JVM_GetFieldTypeAnnotations");
1709
1710 fieldDescriptor fd;
1711 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1712 if (!gotFd) {
1713 return NULL;
1714 }
1715
1716 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1717 JVM_END
1718
1719 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1720 if (!cp->is_within_bounds(index)) {
1721 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1722 }
1723 }
1724
1725 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1726 {
1727 JVMWrapper("JVM_GetMethodParameters");
1728 // method is a handle to a java.lang.reflect.Method object
1729 Method* method_ptr = jvm_get_method_common(method);
1730 methodHandle mh (THREAD, method_ptr);
1731 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1732 const int num_params = mh->method_parameters_length();
1733
1734 if (num_params < 0) {
1735 // A -1 return value from method_parameters_length means there is no
1736 // parameter data. Return null to indicate this to the reflection
1737 // API.
1738 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1739 return (jobjectArray)NULL;
1740 } else {
1741 // Otherwise, we return something up to reflection, even if it is
1742 // a zero-length array. Why? Because in some cases this can
1743 // trigger a MalformedParametersException.
1744
1745 // make sure all the symbols are properly formatted
1746 for (int i = 0; i < num_params; i++) {
1747 MethodParametersElement* params = mh->method_parameters_start();
1748 int index = params[i].name_cp_index;
1749 bounds_check(mh->constants(), index, CHECK_NULL);
1750
1751 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1752 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1753 "Wrong type at constant pool index");
1754 }
1755
1756 }
1757
1758 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1759 objArrayHandle result (THREAD, result_oop);
1760
1761 for (int i = 0; i < num_params; i++) {
1762 MethodParametersElement* params = mh->method_parameters_start();
1763 // For a 0 index, give a NULL symbol
1764 Symbol* sym = 0 != params[i].name_cp_index ?
1765 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1766 int flags = params[i].flags;
1767 oop param = Reflection::new_parameter(reflected_method, i, sym,
1768 flags, CHECK_NULL);
1769 result->obj_at_put(i, param);
1770 }
1771 return (jobjectArray)JNIHandles::make_local(env, result());
1772 }
1773 }
1774 JVM_END
1775
1776 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1777
1778 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1779 {
1780 JVMWrapper("JVM_GetClassDeclaredFields");
1781 JvmtiVMObjectAllocEventCollector oam;
1782
1783 // Exclude primitive types and array types
1784 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1785 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1786 // Return empty array
1787 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1788 return (jobjectArray) JNIHandles::make_local(env, res);
1789 }
1790
1791 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1792 constantPoolHandle cp(THREAD, k->constants());
1793
1794 // Ensure class is linked
1795 k->link_class(CHECK_NULL);
1796
1797 // Allocate result
1798 int num_fields;
1799
1800 if (publicOnly) {
1801 num_fields = 0;
1802 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1803 if (fs.access_flags().is_public()) ++num_fields;
1804 }
1805 } else {
1806 num_fields = k->java_fields_count();
1807 }
1808
1809 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1810 objArrayHandle result (THREAD, r);
1811
1812 int out_idx = 0;
1813 fieldDescriptor fd;
1814 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1815 if (!publicOnly || fs.access_flags().is_public()) {
1816 fd.reinitialize(k, fs.index());
1817 oop field = Reflection::new_field(&fd, CHECK_NULL);
1818 result->obj_at_put(out_idx, field);
1819 ++out_idx;
1820 }
1821 }
1822 assert(out_idx == num_fields, "just checking");
1823 return (jobjectArray) JNIHandles::make_local(env, result());
1824 }
1825 JVM_END
1826
1827 static bool select_method(const methodHandle& method, bool want_constructor) {
1828 if (want_constructor) {
1829 return (method->is_initializer() && !method->is_static());
1830 } else {
1831 return (!method->is_initializer() && !method->is_overpass());
1832 }
1833 }
1834
1835 static jobjectArray get_class_declared_methods_helper(
1836 JNIEnv *env,
1837 jclass ofClass, jboolean publicOnly,
1838 bool want_constructor,
1839 Klass* klass, TRAPS) {
1840
1841 JvmtiVMObjectAllocEventCollector oam;
1842
1843 // Exclude primitive types and array types
1844 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1845 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1846 // Return empty array
1847 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1848 return (jobjectArray) JNIHandles::make_local(env, res);
1849 }
1850
1851 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1852
1853 // Ensure class is linked
1854 k->link_class(CHECK_NULL);
1855
1856 Array<Method*>* methods = k->methods();
1857 int methods_length = methods->length();
1858
1859 // Save original method_idnum in case of redefinition, which can change
1860 // the idnum of obsolete methods. The new method will have the same idnum
1861 // but if we refresh the methods array, the counts will be wrong.
1862 ResourceMark rm(THREAD);
1863 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1864 int num_methods = 0;
1865
1866 for (int i = 0; i < methods_length; i++) {
1867 methodHandle method(THREAD, methods->at(i));
1868 if (select_method(method, want_constructor)) {
1869 if (!publicOnly || method->is_public()) {
1870 idnums->push(method->method_idnum());
1871 ++num_methods;
1872 }
1873 }
1874 }
1875
1876 // Allocate result
1877 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1878 objArrayHandle result (THREAD, r);
1879
1880 // Now just put the methods that we selected above, but go by their idnum
1881 // in case of redefinition. The methods can be redefined at any safepoint,
1882 // so above when allocating the oop array and below when creating reflect
1883 // objects.
1884 for (int i = 0; i < num_methods; i++) {
1885 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1886 if (method.is_null()) {
1887 // Method may have been deleted and seems this API can handle null
1888 // Otherwise should probably put a method that throws NSME
1889 result->obj_at_put(i, NULL);
1890 } else {
1891 oop m;
1892 if (want_constructor) {
1893 m = Reflection::new_constructor(method, CHECK_NULL);
1894 } else {
1895 m = Reflection::new_method(method, false, CHECK_NULL);
1896 }
1897 result->obj_at_put(i, m);
1898 }
1899 }
1900
1901 return (jobjectArray) JNIHandles::make_local(env, result());
1902 }
1903
1904 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1905 {
1906 JVMWrapper("JVM_GetClassDeclaredMethods");
1907 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1908 /*want_constructor*/ false,
1909 SystemDictionary::reflect_Method_klass(), THREAD);
1910 }
1911 JVM_END
1912
1913 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1914 {
1915 JVMWrapper("JVM_GetClassDeclaredConstructors");
1916 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1917 /*want_constructor*/ true,
1918 SystemDictionary::reflect_Constructor_klass(), THREAD);
1919 }
1920 JVM_END
1921
1922 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1923 {
1924 JVMWrapper("JVM_GetClassAccessFlags");
1925 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1926 // Primitive type
1927 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1928 }
1929
1930 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1931 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1932 }
1933 JVM_END
1934
1935
1936 // Constant pool access //////////////////////////////////////////////////////////
1937
1938 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1939 {
1940 JVMWrapper("JVM_GetClassConstantPool");
1941 JvmtiVMObjectAllocEventCollector oam;
1942
1943 // Return null for primitives and arrays
1944 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1945 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1946 if (k->is_instance_klass()) {
1947 InstanceKlass* k_h = InstanceKlass::cast(k);
1948 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1949 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1950 return JNIHandles::make_local(jcp());
1951 }
1952 }
1953 return NULL;
1954 }
1955 JVM_END
1956
1957
1958 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1959 {
1960 JVMWrapper("JVM_ConstantPoolGetSize");
1961 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1962 return cp->length();
1963 }
1964 JVM_END
1965
1966
1967 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1968 {
1969 JVMWrapper("JVM_ConstantPoolGetClassAt");
1970 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1971 bounds_check(cp, index, CHECK_NULL);
1972 constantTag tag = cp->tag_at(index);
1973 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1974 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1975 }
1976 Klass* k = cp->klass_at(index, CHECK_NULL);
1977 return (jclass) JNIHandles::make_local(k->java_mirror());
1978 }
1979 JVM_END
1980
1981 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1982 {
1983 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1984 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1985 bounds_check(cp, index, CHECK_NULL);
1986 constantTag tag = cp->tag_at(index);
1987 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1988 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1989 }
1990 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1991 if (k == NULL) return NULL;
1992 return (jclass) JNIHandles::make_local(k->java_mirror());
1993 }
1994 JVM_END
1995
1996 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1997 constantTag tag = cp->tag_at(index);
1998 if (!tag.is_method() && !tag.is_interface_method()) {
1999 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2000 }
2001 int klass_ref = cp->uncached_klass_ref_index_at(index);
2002 Klass* k_o;
2003 if (force_resolution) {
2004 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2005 } else {
2006 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2007 if (k_o == NULL) return NULL;
2008 }
2009 InstanceKlass* k = InstanceKlass::cast(k_o);
2010 Symbol* name = cp->uncached_name_ref_at(index);
2011 Symbol* sig = cp->uncached_signature_ref_at(index);
2012 methodHandle m (THREAD, k->find_method(name, sig));
2013 if (m.is_null()) {
2014 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2015 }
2016 oop method;
2017 if (!m->is_initializer() || m->is_static()) {
2018 method = Reflection::new_method(m, true, CHECK_NULL);
2019 } else {
2020 method = Reflection::new_constructor(m, CHECK_NULL);
2021 }
2022 return JNIHandles::make_local(method);
2023 }
2024
2025 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2026 {
2027 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2028 JvmtiVMObjectAllocEventCollector oam;
2029 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2030 bounds_check(cp, index, CHECK_NULL);
2031 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2032 return res;
2033 }
2034 JVM_END
2035
2036 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2037 {
2038 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2039 JvmtiVMObjectAllocEventCollector oam;
2040 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2041 bounds_check(cp, index, CHECK_NULL);
2042 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2043 return res;
2044 }
2045 JVM_END
2046
2047 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2048 constantTag tag = cp->tag_at(index);
2049 if (!tag.is_field()) {
2050 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2051 }
2052 int klass_ref = cp->uncached_klass_ref_index_at(index);
2053 Klass* k_o;
2054 if (force_resolution) {
2055 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2056 } else {
2057 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2058 if (k_o == NULL) return NULL;
2059 }
2060 InstanceKlass* k = InstanceKlass::cast(k_o);
2061 Symbol* name = cp->uncached_name_ref_at(index);
2062 Symbol* sig = cp->uncached_signature_ref_at(index);
2063 fieldDescriptor fd;
2064 Klass* target_klass = k->find_field(name, sig, &fd);
2065 if (target_klass == NULL) {
2066 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2067 }
2068 oop field = Reflection::new_field(&fd, CHECK_NULL);
2069 return JNIHandles::make_local(field);
2070 }
2071
2072 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2073 {
2074 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2075 JvmtiVMObjectAllocEventCollector oam;
2076 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2077 bounds_check(cp, index, CHECK_NULL);
2078 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2079 return res;
2080 }
2081 JVM_END
2082
2083 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2084 {
2085 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2086 JvmtiVMObjectAllocEventCollector oam;
2087 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2088 bounds_check(cp, index, CHECK_NULL);
2089 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2090 return res;
2091 }
2092 JVM_END
2093
2094 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2095 {
2096 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2097 JvmtiVMObjectAllocEventCollector oam;
2098 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2099 bounds_check(cp, index, CHECK_NULL);
2100 constantTag tag = cp->tag_at(index);
2101 if (!tag.is_field_or_method()) {
2102 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2103 }
2104 int klass_ref = cp->uncached_klass_ref_index_at(index);
2105 Symbol* klass_name = cp->klass_name_at(klass_ref);
2106 Symbol* member_name = cp->uncached_name_ref_at(index);
2107 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2108 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2109 objArrayHandle dest(THREAD, dest_o);
2110 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2111 dest->obj_at_put(0, str());
2112 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2113 dest->obj_at_put(1, str());
2114 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2115 dest->obj_at_put(2, str());
2116 return (jobjectArray) JNIHandles::make_local(dest());
2117 }
2118 JVM_END
2119
2120 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2121 {
2122 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2123 JvmtiVMObjectAllocEventCollector oam;
2124 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2125 bounds_check(cp, index, CHECK_0);
2126 constantTag tag = cp->tag_at(index);
2127 if (!tag.is_field_or_method()) {
2128 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2129 }
2130 return (jint) cp->uncached_klass_ref_index_at(index);
2131 }
2132 JVM_END
2133
2134 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2135 {
2136 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2137 JvmtiVMObjectAllocEventCollector oam;
2138 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2139 bounds_check(cp, index, CHECK_0);
2140 constantTag tag = cp->tag_at(index);
2141 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2142 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2143 }
2144 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2145 }
2146 JVM_END
2147
2148 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2149 {
2150 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2151 JvmtiVMObjectAllocEventCollector oam;
2152 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2153 bounds_check(cp, index, CHECK_NULL);
2154 constantTag tag = cp->tag_at(index);
2155 if (!tag.is_name_and_type()) {
2156 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2157 }
2158 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2159 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2160 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2161 objArrayHandle dest(THREAD, dest_o);
2162 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2163 dest->obj_at_put(0, str());
2164 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2165 dest->obj_at_put(1, str());
2166 return (jobjectArray) JNIHandles::make_local(dest());
2167 }
2168 JVM_END
2169
2170 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2171 {
2172 JVMWrapper("JVM_ConstantPoolGetIntAt");
2173 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2174 bounds_check(cp, index, CHECK_0);
2175 constantTag tag = cp->tag_at(index);
2176 if (!tag.is_int()) {
2177 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2178 }
2179 return cp->int_at(index);
2180 }
2181 JVM_END
2182
2183 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2184 {
2185 JVMWrapper("JVM_ConstantPoolGetLongAt");
2186 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2187 bounds_check(cp, index, CHECK_(0L));
2188 constantTag tag = cp->tag_at(index);
2189 if (!tag.is_long()) {
2190 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2191 }
2192 return cp->long_at(index);
2193 }
2194 JVM_END
2195
2196 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2197 {
2198 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2199 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2200 bounds_check(cp, index, CHECK_(0.0f));
2201 constantTag tag = cp->tag_at(index);
2202 if (!tag.is_float()) {
2203 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2204 }
2205 return cp->float_at(index);
2206 }
2207 JVM_END
2208
2209 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2210 {
2211 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2212 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2213 bounds_check(cp, index, CHECK_(0.0));
2214 constantTag tag = cp->tag_at(index);
2215 if (!tag.is_double()) {
2216 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2217 }
2218 return cp->double_at(index);
2219 }
2220 JVM_END
2221
2222 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2223 {
2224 JVMWrapper("JVM_ConstantPoolGetStringAt");
2225 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2226 bounds_check(cp, index, CHECK_NULL);
2227 constantTag tag = cp->tag_at(index);
2228 if (!tag.is_string()) {
2229 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2230 }
2231 oop str = cp->string_at(index, CHECK_NULL);
2232 return (jstring) JNIHandles::make_local(str);
2233 }
2234 JVM_END
2235
2236 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2237 {
2238 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2239 JvmtiVMObjectAllocEventCollector oam;
2240 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2241 bounds_check(cp, index, CHECK_NULL);
2242 constantTag tag = cp->tag_at(index);
2243 if (!tag.is_symbol()) {
2244 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2245 }
2246 Symbol* sym = cp->symbol_at(index);
2247 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2248 return (jstring) JNIHandles::make_local(str());
2249 }
2250 JVM_END
2251
2252 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2253 {
2254 JVMWrapper("JVM_ConstantPoolGetTagAt");
2255 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2256 bounds_check(cp, index, CHECK_0);
2257 constantTag tag = cp->tag_at(index);
2258 jbyte result = tag.value();
2259 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2260 // they are changed to the corresponding tags from the JVM spec, so that java code in
2261 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2262 if (tag.is_klass_or_reference()) {
2263 result = JVM_CONSTANT_Class;
2264 } else if (tag.is_string_index()) {
2265 result = JVM_CONSTANT_String;
2266 } else if (tag.is_method_type_in_error()) {
2267 result = JVM_CONSTANT_MethodType;
2268 } else if (tag.is_method_handle_in_error()) {
2269 result = JVM_CONSTANT_MethodHandle;
2270 } else if (tag.is_dynamic_constant_in_error()) {
2271 result = JVM_CONSTANT_Dynamic;
2272 }
2273 return result;
2274 }
2275 JVM_END
2276
2277 // Assertion support. //////////////////////////////////////////////////////////
2278
2279 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2280 JVMWrapper("JVM_DesiredAssertionStatus");
2281 assert(cls != NULL, "bad class");
2282
2283 oop r = JNIHandles::resolve(cls);
2284 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2285 if (java_lang_Class::is_primitive(r)) return false;
2286
2287 Klass* k = java_lang_Class::as_Klass(r);
2288 assert(k->is_instance_klass(), "must be an instance klass");
2289 if (!k->is_instance_klass()) return false;
2290
2291 ResourceMark rm(THREAD);
2292 const char* name = k->name()->as_C_string();
2293 bool system_class = k->class_loader() == NULL;
2294 return JavaAssertions::enabled(name, system_class);
2295
2296 JVM_END
2297
2298
2299 // Return a new AssertionStatusDirectives object with the fields filled in with
2300 // command-line assertion arguments (i.e., -ea, -da).
2301 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2302 JVMWrapper("JVM_AssertionStatusDirectives");
2303 JvmtiVMObjectAllocEventCollector oam;
2304 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2305 return JNIHandles::make_local(env, asd);
2306 JVM_END
2307
2308 // Verification ////////////////////////////////////////////////////////////////////////////////
2309
2310 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2311
2312 // RedefineClasses support: bug 6214132 caused verification to fail.
2313 // All functions from this section should call the jvmtiThreadSate function:
2314 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2315 // The function returns a Klass* of the _scratch_class if the verifier
2316 // was invoked in the middle of the class redefinition.
2317 // Otherwise it returns its argument value which is the _the_class Klass*.
2318 // Please, refer to the description in the jvmtiThreadSate.hpp.
2319
2320 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2321 JVMWrapper("JVM_GetClassNameUTF");
2322 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2323 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2324 return k->name()->as_utf8();
2325 JVM_END
2326
2327
2328 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2329 JVMWrapper("JVM_GetClassCPTypes");
2330 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2331 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2332 // types will have length zero if this is not an InstanceKlass
2333 // (length is determined by call to JVM_GetClassCPEntriesCount)
2334 if (k->is_instance_klass()) {
2335 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2336 for (int index = cp->length() - 1; index >= 0; index--) {
2337 constantTag tag = cp->tag_at(index);
2338 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2339 }
2340 }
2341 JVM_END
2342
2343
2344 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2345 JVMWrapper("JVM_GetClassCPEntriesCount");
2346 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2347 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2348 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2349 JVM_END
2350
2351
2352 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2353 JVMWrapper("JVM_GetClassFieldsCount");
2354 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2355 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2356 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2357 JVM_END
2358
2359
2360 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2361 JVMWrapper("JVM_GetClassMethodsCount");
2362 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2363 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2364 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2365 JVM_END
2366
2367
2368 // The following methods, used for the verifier, are never called with
2369 // array klasses, so a direct cast to InstanceKlass is safe.
2370 // Typically, these methods are called in a loop with bounds determined
2371 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2372 // zero for arrays.
2373 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2374 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2375 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2376 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2377 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2378 int length = method->checked_exceptions_length();
2379 if (length > 0) {
2380 CheckedExceptionElement* table= method->checked_exceptions_start();
2381 for (int i = 0; i < length; i++) {
2382 exceptions[i] = table[i].class_cp_index;
2383 }
2384 }
2385 JVM_END
2386
2387
2388 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2389 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2390 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2391 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2392 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2393 return method->checked_exceptions_length();
2394 JVM_END
2395
2396
2397 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2398 JVMWrapper("JVM_GetMethodIxByteCode");
2399 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2400 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2401 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2402 memcpy(code, method->code_base(), method->code_size());
2403 JVM_END
2404
2405
2406 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2407 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2408 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2409 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2410 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2411 return method->code_size();
2412 JVM_END
2413
2414
2415 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2416 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2417 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2418 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2419 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2420 ExceptionTable extable(method);
2421 entry->start_pc = extable.start_pc(entry_index);
2422 entry->end_pc = extable.end_pc(entry_index);
2423 entry->handler_pc = extable.handler_pc(entry_index);
2424 entry->catchType = extable.catch_type_index(entry_index);
2425 JVM_END
2426
2427
2428 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2429 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2430 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2431 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2432 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2433 return method->exception_table_length();
2434 JVM_END
2435
2436
2437 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2438 JVMWrapper("JVM_GetMethodIxModifiers");
2439 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2440 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2441 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2442 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2443 JVM_END
2444
2445
2446 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2447 JVMWrapper("JVM_GetFieldIxModifiers");
2448 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2449 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2450 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2451 JVM_END
2452
2453
2454 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2455 JVMWrapper("JVM_GetMethodIxLocalsCount");
2456 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2457 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2458 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2459 return method->max_locals();
2460 JVM_END
2461
2462
2463 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2464 JVMWrapper("JVM_GetMethodIxArgsSize");
2465 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2466 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2467 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2468 return method->size_of_parameters();
2469 JVM_END
2470
2471
2472 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2473 JVMWrapper("JVM_GetMethodIxMaxStack");
2474 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2475 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2476 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2477 return method->verifier_max_stack();
2478 JVM_END
2479
2480
2481 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2482 JVMWrapper("JVM_IsConstructorIx");
2483 ResourceMark rm(THREAD);
2484 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2485 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2486 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2487 return method->name() == vmSymbols::object_initializer_name();
2488 JVM_END
2489
2490
2491 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2492 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2493 ResourceMark rm(THREAD);
2494 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2495 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2496 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2497 return method->is_overpass();
2498 JVM_END
2499
2500 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2501 JVMWrapper("JVM_GetMethodIxIxUTF");
2502 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2503 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2504 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2505 return method->name()->as_utf8();
2506 JVM_END
2507
2508
2509 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2510 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2511 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2512 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2513 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2514 return method->signature()->as_utf8();
2515 JVM_END
2516
2517 /**
2518 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2519 * read entries in the constant pool. Since the old verifier always
2520 * works on a copy of the code, it will not see any rewriting that
2521 * may possibly occur in the middle of verification. So it is important
2522 * that nothing it calls tries to use the cpCache instead of the raw
2523 * constant pool, so we must use cp->uncached_x methods when appropriate.
2524 */
2525 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2526 JVMWrapper("JVM_GetCPFieldNameUTF");
2527 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2528 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2529 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2530 switch (cp->tag_at(cp_index).value()) {
2531 case JVM_CONSTANT_Fieldref:
2532 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2533 default:
2534 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2535 }
2536 ShouldNotReachHere();
2537 return NULL;
2538 JVM_END
2539
2540
2541 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2542 JVMWrapper("JVM_GetCPMethodNameUTF");
2543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2544 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2545 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2546 switch (cp->tag_at(cp_index).value()) {
2547 case JVM_CONSTANT_InterfaceMethodref:
2548 case JVM_CONSTANT_Methodref:
2549 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2550 default:
2551 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2552 }
2553 ShouldNotReachHere();
2554 return NULL;
2555 JVM_END
2556
2557
2558 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2559 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2560 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2561 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2562 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2563 switch (cp->tag_at(cp_index).value()) {
2564 case JVM_CONSTANT_InterfaceMethodref:
2565 case JVM_CONSTANT_Methodref:
2566 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2567 default:
2568 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2569 }
2570 ShouldNotReachHere();
2571 return NULL;
2572 JVM_END
2573
2574
2575 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2576 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2577 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2578 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2579 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2580 switch (cp->tag_at(cp_index).value()) {
2581 case JVM_CONSTANT_Fieldref:
2582 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2583 default:
2584 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2585 }
2586 ShouldNotReachHere();
2587 return NULL;
2588 JVM_END
2589
2590
2591 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2592 JVMWrapper("JVM_GetCPClassNameUTF");
2593 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2594 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2595 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2596 Symbol* classname = cp->klass_name_at(cp_index);
2597 return classname->as_utf8();
2598 JVM_END
2599
2600
2601 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2602 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2603 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2604 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2605 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2606 switch (cp->tag_at(cp_index).value()) {
2607 case JVM_CONSTANT_Fieldref: {
2608 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2609 Symbol* classname = cp->klass_name_at(class_index);
2610 return classname->as_utf8();
2611 }
2612 default:
2613 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2614 }
2615 ShouldNotReachHere();
2616 return NULL;
2617 JVM_END
2618
2619
2620 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2621 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2622 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2623 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2624 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2625 switch (cp->tag_at(cp_index).value()) {
2626 case JVM_CONSTANT_Methodref:
2627 case JVM_CONSTANT_InterfaceMethodref: {
2628 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2629 Symbol* classname = cp->klass_name_at(class_index);
2630 return classname->as_utf8();
2631 }
2632 default:
2633 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2634 }
2635 ShouldNotReachHere();
2636 return NULL;
2637 JVM_END
2638
2639
2640 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2641 JVMWrapper("JVM_GetCPFieldModifiers");
2642 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2643 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2644 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2645 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2646 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2647 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2648 switch (cp->tag_at(cp_index).value()) {
2649 case JVM_CONSTANT_Fieldref: {
2650 Symbol* name = cp->uncached_name_ref_at(cp_index);
2651 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2652 InstanceKlass* ik = InstanceKlass::cast(k_called);
2653 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2654 if (fs.name() == name && fs.signature() == signature) {
2655 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2656 }
2657 }
2658 return -1;
2659 }
2660 default:
2661 fatal("JVM_GetCPFieldModifiers: illegal constant");
2662 }
2663 ShouldNotReachHere();
2664 return 0;
2665 JVM_END
2666
2667
2668 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2669 JVMWrapper("JVM_GetCPMethodModifiers");
2670 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2671 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2672 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2673 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2674 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2675 switch (cp->tag_at(cp_index).value()) {
2676 case JVM_CONSTANT_Methodref:
2677 case JVM_CONSTANT_InterfaceMethodref: {
2678 Symbol* name = cp->uncached_name_ref_at(cp_index);
2679 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2680 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2681 int methods_count = methods->length();
2682 for (int i = 0; i < methods_count; i++) {
2683 Method* method = methods->at(i);
2684 if (method->name() == name && method->signature() == signature) {
2685 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2686 }
2687 }
2688 return -1;
2689 }
2690 default:
2691 fatal("JVM_GetCPMethodModifiers: illegal constant");
2692 }
2693 ShouldNotReachHere();
2694 return 0;
2695 JVM_END
2696
2697
2698 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2699
2700 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2701 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2702 JVM_END
2703
2704
2705 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2706 JVMWrapper("JVM_IsSameClassPackage");
2707 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2708 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2709 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2710 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2711 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2712 JVM_END
2713
2714 // Printing support //////////////////////////////////////////////////
2715 extern "C" {
2716
2717 ATTRIBUTE_PRINTF(3, 0)
2718 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2719 // Reject count values that are negative signed values converted to
2720 // unsigned; see bug 4399518, 4417214
2721 if ((intptr_t)count <= 0) return -1;
2722
2723 int result = os::vsnprintf(str, count, fmt, args);
2724 if (result > 0 && (size_t)result >= count) {
2725 result = -1;
2726 }
2727
2728 return result;
2729 }
2730
2731 ATTRIBUTE_PRINTF(3, 4)
2732 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2733 va_list args;
2734 int len;
2735 va_start(args, fmt);
2736 len = jio_vsnprintf(str, count, fmt, args);
2737 va_end(args);
2738 return len;
2739 }
2740
2741 ATTRIBUTE_PRINTF(2, 3)
2742 int jio_fprintf(FILE* f, const char *fmt, ...) {
2743 int len;
2744 va_list args;
2745 va_start(args, fmt);
2746 len = jio_vfprintf(f, fmt, args);
2747 va_end(args);
2748 return len;
2749 }
2750
2751 ATTRIBUTE_PRINTF(2, 0)
2752 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2753 if (Arguments::vfprintf_hook() != NULL) {
2754 return Arguments::vfprintf_hook()(f, fmt, args);
2755 } else {
2756 return vfprintf(f, fmt, args);
2757 }
2758 }
2759
2760 ATTRIBUTE_PRINTF(1, 2)
2761 JNIEXPORT int jio_printf(const char *fmt, ...) {
2762 int len;
2763 va_list args;
2764 va_start(args, fmt);
2765 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2766 va_end(args);
2767 return len;
2768 }
2769
2770 // HotSpot specific jio method
2771 void jio_print(const char* s, size_t len) {
2772 // Try to make this function as atomic as possible.
2773 if (Arguments::vfprintf_hook() != NULL) {
2774 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2775 } else {
2776 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2777 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2778 }
2779 }
2780
2781 } // Extern C
2782
2783 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2784
2785 // In most of the JVM thread support functions we need to access the
2786 // thread through a ThreadsListHandle to prevent it from exiting and
2787 // being reclaimed while we try to operate on it. The exceptions to this
2788 // rule are when operating on the current thread, or if the monitor of
2789 // the target java.lang.Thread is locked at the Java level - in both
2790 // cases the target cannot exit.
2791
2792 static void thread_entry(JavaThread* thread, TRAPS) {
2793 HandleMark hm(THREAD);
2794 Handle obj(THREAD, thread->threadObj());
2795 JavaValue result(T_VOID);
2796 JavaCalls::call_virtual(&result,
2797 obj,
2798 SystemDictionary::Thread_klass(),
2799 vmSymbols::run_method_name(),
2800 vmSymbols::void_method_signature(),
2801 THREAD);
2802 }
2803
2804
2805 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2806 JVMWrapper("JVM_StartThread");
2807 JavaThread *native_thread = NULL;
2808
2809 // We cannot hold the Threads_lock when we throw an exception,
2810 // due to rank ordering issues. Example: we might need to grab the
2811 // Heap_lock while we construct the exception.
2812 bool throw_illegal_thread_state = false;
2813
2814 // We must release the Threads_lock before we can post a jvmti event
2815 // in Thread::start.
2816 {
2817 // Ensure that the C++ Thread and OSThread structures aren't freed before
2818 // we operate.
2819 MutexLocker mu(Threads_lock);
2820
2821 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2822 // re-starting an already started thread, so we should usually find
2823 // that the JavaThread is null. However for a JNI attached thread
2824 // there is a small window between the Thread object being created
2825 // (with its JavaThread set) and the update to its threadStatus, so we
2826 // have to check for this
2827 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2828 throw_illegal_thread_state = true;
2829 } else {
2830 // We could also check the stillborn flag to see if this thread was already stopped, but
2831 // for historical reasons we let the thread detect that itself when it starts running
2832
2833 jlong size =
2834 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2835 // Allocate the C++ Thread structure and create the native thread. The
2836 // stack size retrieved from java is 64-bit signed, but the constructor takes
2837 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2838 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2839 // - Avoid passing negative values which would result in really large stacks.
2840 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2841 size_t sz = size > 0 ? (size_t) size : 0;
2842 native_thread = new JavaThread(&thread_entry, sz);
2843
2844 // At this point it may be possible that no osthread was created for the
2845 // JavaThread due to lack of memory. Check for this situation and throw
2846 // an exception if necessary. Eventually we may want to change this so
2847 // that we only grab the lock if the thread was created successfully -
2848 // then we can also do this check and throw the exception in the
2849 // JavaThread constructor.
2850 if (native_thread->osthread() != NULL) {
2851 // Note: the current thread is not being used within "prepare".
2852 native_thread->prepare(jthread);
2853 }
2854 }
2855 }
2856
2857 if (throw_illegal_thread_state) {
2858 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2859 }
2860
2861 assert(native_thread != NULL, "Starting null thread?");
2862
2863 if (native_thread->osthread() == NULL) {
2864 // No one should hold a reference to the 'native_thread'.
2865 native_thread->smr_delete();
2866 if (JvmtiExport::should_post_resource_exhausted()) {
2867 JvmtiExport::post_resource_exhausted(
2868 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2869 os::native_thread_creation_failed_msg());
2870 }
2871 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2872 os::native_thread_creation_failed_msg());
2873 }
2874
2875 Thread::start(native_thread);
2876
2877 JVM_END
2878
2879
2880 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2881 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2882 // but is thought to be reliable and simple. In the case, where the receiver is the
2883 // same thread as the sender, no VM_Operation is needed.
2884 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2885 JVMWrapper("JVM_StopThread");
2886
2887 // A nested ThreadsListHandle will grab the Threads_lock so create
2888 // tlh before we resolve throwable.
2889 ThreadsListHandle tlh(thread);
2890 oop java_throwable = JNIHandles::resolve(throwable);
2891 if (java_throwable == NULL) {
2892 THROW(vmSymbols::java_lang_NullPointerException());
2893 }
2894 oop java_thread = NULL;
2895 JavaThread* receiver = NULL;
2896 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2897 Events::log_exception(thread,
2898 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2899 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2900
2901 if (is_alive) {
2902 // jthread refers to a live JavaThread.
2903 if (thread == receiver) {
2904 // Exception is getting thrown at self so no VM_Operation needed.
2905 THROW_OOP(java_throwable);
2906 } else {
2907 // Use a VM_Operation to throw the exception.
2908 Thread::send_async_exception(java_thread, java_throwable);
2909 }
2910 } else {
2911 // Either:
2912 // - target thread has not been started before being stopped, or
2913 // - target thread already terminated
2914 // We could read the threadStatus to determine which case it is
2915 // but that is overkill as it doesn't matter. We must set the
2916 // stillborn flag for the first case, and if the thread has already
2917 // exited setting this flag has no effect.
2918 java_lang_Thread::set_stillborn(java_thread);
2919 }
2920 JVM_END
2921
2922
2923 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2924 JVMWrapper("JVM_IsThreadAlive");
2925
2926 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2927 return java_lang_Thread::is_alive(thread_oop);
2928 JVM_END
2929
2930
2931 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2932 JVMWrapper("JVM_SuspendThread");
2933
2934 ThreadsListHandle tlh(thread);
2935 JavaThread* receiver = NULL;
2936 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2937 if (is_alive) {
2938 // jthread refers to a live JavaThread.
2939 {
2940 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2941 if (receiver->is_external_suspend()) {
2942 // Don't allow nested external suspend requests. We can't return
2943 // an error from this interface so just ignore the problem.
2944 return;
2945 }
2946 if (receiver->is_exiting()) { // thread is in the process of exiting
2947 return;
2948 }
2949 receiver->set_external_suspend();
2950 }
2951
2952 // java_suspend() will catch threads in the process of exiting
2953 // and will ignore them.
2954 receiver->java_suspend();
2955
2956 // It would be nice to have the following assertion in all the
2957 // time, but it is possible for a racing resume request to have
2958 // resumed this thread right after we suspended it. Temporarily
2959 // enable this assertion if you are chasing a different kind of
2960 // bug.
2961 //
2962 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2963 // receiver->is_being_ext_suspended(), "thread is not suspended");
2964 }
2965 JVM_END
2966
2967
2968 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2969 JVMWrapper("JVM_ResumeThread");
2970
2971 ThreadsListHandle tlh(thread);
2972 JavaThread* receiver = NULL;
2973 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2974 if (is_alive) {
2975 // jthread refers to a live JavaThread.
2976
2977 // This is the original comment for this Threads_lock grab:
2978 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2979 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2980 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2981 // looks at it.
2982 //
2983 // The above comment dates back to when we had both internal and
2984 // external suspend APIs that shared a common underlying mechanism.
2985 // External suspend is now entirely cooperative and doesn't share
2986 // anything with internal suspend. That said, there are some
2987 // assumptions in the VM that an external resume grabs the
2988 // Threads_lock. We can't drop the Threads_lock grab here until we
2989 // resolve the assumptions that exist elsewhere.
2990 //
2991 MutexLocker ml(Threads_lock);
2992 receiver->java_resume();
2993 }
2994 JVM_END
2995
2996
2997 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2998 JVMWrapper("JVM_SetThreadPriority");
2999
3000 ThreadsListHandle tlh(thread);
3001 oop java_thread = NULL;
3002 JavaThread* receiver = NULL;
3003 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3004 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3005
3006 if (is_alive) {
3007 // jthread refers to a live JavaThread.
3008 Thread::set_priority(receiver, (ThreadPriority)prio);
3009 }
3010 // Implied else: If the JavaThread hasn't started yet, then the
3011 // priority set in the java.lang.Thread object above will be pushed
3012 // down when it does start.
3013 JVM_END
3014
3015
3016 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3017 JVMWrapper("JVM_Yield");
3018 if (os::dont_yield()) return;
3019 HOTSPOT_THREAD_YIELD();
3020 os::naked_yield();
3021 JVM_END
3022
3023
3024 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3025 JVMWrapper("JVM_Sleep");
3026
3027 if (millis < 0) {
3028 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3029 }
3030
3031 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3032 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3033 }
3034
3035 // Save current thread state and restore it at the end of this block.
3036 // And set new thread state to SLEEPING.
3037 JavaThreadSleepState jtss(thread);
3038
3039 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3040
3041 EventThreadSleep event;
3042
3043 if (millis == 0) {
3044 os::naked_yield();
3045 } else {
3046 ThreadState old_state = thread->osthread()->get_state();
3047 thread->osthread()->set_state(SLEEPING);
3048 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3049 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3050 // us while we were sleeping. We do not overwrite those.
3051 if (!HAS_PENDING_EXCEPTION) {
3052 if (event.should_commit()) {
3053 event.set_time(millis);
3054 event.commit();
3055 }
3056 HOTSPOT_THREAD_SLEEP_END(1);
3057
3058 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3059 // to properly restore the thread state. That's likely wrong.
3060 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3061 }
3062 }
3063 thread->osthread()->set_state(old_state);
3064 }
3065 if (event.should_commit()) {
3066 event.set_time(millis);
3067 event.commit();
3068 }
3069 HOTSPOT_THREAD_SLEEP_END(0);
3070 JVM_END
3071
3072 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3073 JVMWrapper("JVM_CurrentThread");
3074 oop jthread = thread->threadObj();
3075 assert (thread != NULL, "no current thread!");
3076 return JNIHandles::make_local(env, jthread);
3077 JVM_END
3078
3079
3080 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3081 JVMWrapper("JVM_CountStackFrames");
3082
3083 uint32_t debug_bits = 0;
3084 ThreadsListHandle tlh(thread);
3085 JavaThread* receiver = NULL;
3086 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3087 int count = 0;
3088 if (is_alive) {
3089 // jthread refers to a live JavaThread.
3090 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
3091 // Count all java activation, i.e., number of vframes.
3092 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) {
3093 // Native frames are not counted.
3094 if (!vfst.method()->is_native()) count++;
3095 }
3096 } else {
3097 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3098 "this thread is not suspended");
3099 }
3100 }
3101 // Implied else: if JavaThread is not alive simply return a count of 0.
3102
3103 return count;
3104 JVM_END
3105
3106
3107 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3108 JVMWrapper("JVM_Interrupt");
3109
3110 ThreadsListHandle tlh(thread);
3111 JavaThread* receiver = NULL;
3112 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3113 if (is_alive) {
3114 // jthread refers to a live JavaThread.
3115 Thread::interrupt(receiver);
3116 }
3117 JVM_END
3118
3119
3120 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3121 JVMWrapper("JVM_IsInterrupted");
3122
3123 ThreadsListHandle tlh(thread);
3124 JavaThread* receiver = NULL;
3125 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3126 if (is_alive) {
3127 // jthread refers to a live JavaThread.
3128 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3129 } else {
3130 return JNI_FALSE;
3131 }
3132 JVM_END
3133
3134
3135 // Return true iff the current thread has locked the object passed in
3136
3137 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3138 JVMWrapper("JVM_HoldsLock");
3139 assert(THREAD->is_Java_thread(), "sanity check");
3140 if (obj == NULL) {
3141 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3142 }
3143 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3144 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3145 JVM_END
3146
3147
3148 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3149 JVMWrapper("JVM_DumpAllStacks");
3150 VM_PrintThreads op;
3151 VMThread::execute(&op);
3152 if (JvmtiExport::should_post_data_dump()) {
3153 JvmtiExport::post_data_dump();
3154 }
3155 JVM_END
3156
3157 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3158 JVMWrapper("JVM_SetNativeThreadName");
3159
3160 // We don't use a ThreadsListHandle here because the current thread
3161 // must be alive.
3162 oop java_thread = JNIHandles::resolve_non_null(jthread);
3163 JavaThread* thr = java_lang_Thread::thread(java_thread);
3164 if (thread == thr && !thr->has_attached_via_jni()) {
3165 // Thread naming is only supported for the current thread and
3166 // we don't set the name of an attached thread to avoid stepping
3167 // on other programs.
3168 ResourceMark rm(thread);
3169 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3170 os::set_native_thread_name(thread_name);
3171 }
3172 JVM_END
3173
3174 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3175
3176 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3177 JVMWrapper("JVM_GetClassContext");
3178 ResourceMark rm(THREAD);
3179 JvmtiVMObjectAllocEventCollector oam;
3180 vframeStream vfst(thread);
3181
3182 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3183 // This must only be called from SecurityManager.getClassContext
3184 Method* m = vfst.method();
3185 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3186 m->name() == vmSymbols::getClassContext_name() &&
3187 m->signature() == vmSymbols::void_class_array_signature())) {
3188 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3189 }
3190 }
3191
3192 // Collect method holders
3193 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3194 for (; !vfst.at_end(); vfst.security_next()) {
3195 Method* m = vfst.method();
3196 // Native frames are not returned
3197 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3198 Klass* holder = m->method_holder();
3199 assert(holder->is_klass(), "just checking");
3200 klass_array->append(holder);
3201 }
3202 }
3203
3204 // Create result array of type [Ljava/lang/Class;
3205 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3206 // Fill in mirrors corresponding to method holders
3207 for (int i = 0; i < klass_array->length(); i++) {
3208 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3209 }
3210
3211 return (jobjectArray) JNIHandles::make_local(env, result);
3212 JVM_END
3213
3214
3215 // java.lang.Package ////////////////////////////////////////////////////////////////
3216
3217
3218 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3219 JVMWrapper("JVM_GetSystemPackage");
3220 ResourceMark rm(THREAD);
3221 JvmtiVMObjectAllocEventCollector oam;
3222 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3223 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3224 return (jstring) JNIHandles::make_local(result);
3225 JVM_END
3226
3227
3228 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3229 JVMWrapper("JVM_GetSystemPackages");
3230 JvmtiVMObjectAllocEventCollector oam;
3231 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3232 return (jobjectArray) JNIHandles::make_local(result);
3233 JVM_END
3234
3235
3236 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3237
3238
3239 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3240 JVMWrapper("JVM_GetAndClearReferencePendingList");
3241
3242 MonitorLockerEx ml(Heap_lock);
3243 oop ref = Universe::reference_pending_list();
3244 if (ref != NULL) {
3245 Universe::set_reference_pending_list(NULL);
3246 }
3247 return JNIHandles::make_local(env, ref);
3248 JVM_END
3249
3250 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3251 JVMWrapper("JVM_HasReferencePendingList");
3252 MonitorLockerEx ml(Heap_lock);
3253 return Universe::has_reference_pending_list();
3254 JVM_END
3255
3256 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3257 JVMWrapper("JVM_WaitForReferencePendingList");
3258 MonitorLockerEx ml(Heap_lock);
3259 while (!Universe::has_reference_pending_list()) {
3260 ml.wait();
3261 }
3262 JVM_END
3263
3264
3265 // ObjectInputStream ///////////////////////////////////////////////////////////////
3266
3267 // Return the first user-defined class loader up the execution stack, or null
3268 // if only code from the bootstrap or platform class loader is on the stack.
3269
3270 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3271 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3272 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3273 oop loader = vfst.method()->method_holder()->class_loader();
3274 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3275 return JNIHandles::make_local(env, loader);
3276 }
3277 }
3278 return NULL;
3279 JVM_END
3280
3281
3282 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3283
3284
3285 // resolve array handle and check arguments
3286 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3287 if (arr == NULL) {
3288 THROW_0(vmSymbols::java_lang_NullPointerException());
3289 }
3290 oop a = JNIHandles::resolve_non_null(arr);
3291 if (!a->is_array()) {
3292 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3293 } else if (type_array_only && !a->is_typeArray()) {
3294 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3295 }
3296 return arrayOop(a);
3297 }
3298
3299
3300 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3301 JVMWrapper("JVM_GetArrayLength");
3302 arrayOop a = check_array(env, arr, false, CHECK_0);
3303 return a->length();
3304 JVM_END
3305
3306
3307 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3308 JVMWrapper("JVM_Array_Get");
3309 JvmtiVMObjectAllocEventCollector oam;
3310 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3311 jvalue value;
3312 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3313 oop box = Reflection::box(&value, type, CHECK_NULL);
3314 return JNIHandles::make_local(env, box);
3315 JVM_END
3316
3317
3318 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3319 JVMWrapper("JVM_GetPrimitiveArrayElement");
3320 jvalue value;
3321 value.i = 0; // to initialize value before getting used in CHECK
3322 arrayOop a = check_array(env, arr, true, CHECK_(value));
3323 assert(a->is_typeArray(), "just checking");
3324 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3325 BasicType wide_type = (BasicType) wCode;
3326 if (type != wide_type) {
3327 Reflection::widen(&value, type, wide_type, CHECK_(value));
3328 }
3329 return value;
3330 JVM_END
3331
3332
3333 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3334 JVMWrapper("JVM_SetArrayElement");
3335 arrayOop a = check_array(env, arr, false, CHECK);
3336 oop box = JNIHandles::resolve(val);
3337 jvalue value;
3338 value.i = 0; // to initialize value before getting used in CHECK
3339 BasicType value_type;
3340 if (a->is_objArray()) {
3341 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3342 value_type = Reflection::unbox_for_regular_object(box, &value);
3343 } else {
3344 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3345 }
3346 Reflection::array_set(&value, a, index, value_type, CHECK);
3347 JVM_END
3348
3349
3350 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3351 JVMWrapper("JVM_SetPrimitiveArrayElement");
3352 arrayOop a = check_array(env, arr, true, CHECK);
3353 assert(a->is_typeArray(), "just checking");
3354 BasicType value_type = (BasicType) vCode;
3355 Reflection::array_set(&v, a, index, value_type, CHECK);
3356 JVM_END
3357
3358
3359 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3360 JVMWrapper("JVM_NewArray");
3361 JvmtiVMObjectAllocEventCollector oam;
3362 oop element_mirror = JNIHandles::resolve(eltClass);
3363 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3364 return JNIHandles::make_local(env, result);
3365 JVM_END
3366
3367
3368 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3369 JVMWrapper("JVM_NewMultiArray");
3370 JvmtiVMObjectAllocEventCollector oam;
3371 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3372 oop element_mirror = JNIHandles::resolve(eltClass);
3373 assert(dim_array->is_typeArray(), "just checking");
3374 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3375 return JNIHandles::make_local(env, result);
3376 JVM_END
3377
3378
3379 // Library support ///////////////////////////////////////////////////////////////////////////
3380
3381 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3382 //%note jvm_ct
3383 JVMWrapper("JVM_LoadLibrary");
3384 char ebuf[1024];
3385 void *load_result;
3386 {
3387 ThreadToNativeFromVM ttnfvm(thread);
3388 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3389 }
3390 if (load_result == NULL) {
3391 char msg[1024];
3392 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3393 // Since 'ebuf' may contain a string encoded using
3394 // platform encoding scheme, we need to pass
3395 // Exceptions::unsafe_to_utf8 to the new_exception method
3396 // as the last argument. See bug 6367357.
3397 Handle h_exception =
3398 Exceptions::new_exception(thread,
3399 vmSymbols::java_lang_UnsatisfiedLinkError(),
3400 msg, Exceptions::unsafe_to_utf8);
3401
3402 THROW_HANDLE_0(h_exception);
3403 }
3404 return load_result;
3405 JVM_END
3406
3407
3408 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3409 JVMWrapper("JVM_UnloadLibrary");
3410 os::dll_unload(handle);
3411 JVM_END
3412
3413
3414 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3415 JVMWrapper("JVM_FindLibraryEntry");
3416 return os::dll_lookup(handle, name);
3417 JVM_END
3418
3419
3420 // JNI version ///////////////////////////////////////////////////////////////////////////////
3421
3422 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3423 JVMWrapper("JVM_IsSupportedJNIVersion");
3424 return Threads::is_supported_jni_version_including_1_1(version);
3425 JVM_END
3426
3427
3428 // String support ///////////////////////////////////////////////////////////////////////////
3429
3430 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3431 JVMWrapper("JVM_InternString");
3432 JvmtiVMObjectAllocEventCollector oam;
3433 if (str == NULL) return NULL;
3434 oop string = JNIHandles::resolve_non_null(str);
3435 oop result = StringTable::intern(string, CHECK_NULL);
3436 return (jstring) JNIHandles::make_local(env, result);
3437 JVM_END
3438
3439
3440 // Raw monitor support //////////////////////////////////////////////////////////////////////
3441
3442 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3443 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3444 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3445 // that only works with java threads.
3446
3447
3448 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3449 VM_Exit::block_if_vm_exited();
3450 JVMWrapper("JVM_RawMonitorCreate");
3451 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3452 }
3453
3454
3455 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3456 VM_Exit::block_if_vm_exited();
3457 JVMWrapper("JVM_RawMonitorDestroy");
3458 delete ((Mutex*) mon);
3459 }
3460
3461
3462 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3463 VM_Exit::block_if_vm_exited();
3464 JVMWrapper("JVM_RawMonitorEnter");
3465 ((Mutex*) mon)->jvm_raw_lock();
3466 return 0;
3467 }
3468
3469
3470 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3471 VM_Exit::block_if_vm_exited();
3472 JVMWrapper("JVM_RawMonitorExit");
3473 ((Mutex*) mon)->jvm_raw_unlock();
3474 }
3475
3476
3477 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3478
3479 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3480 Handle loader, Handle protection_domain,
3481 jboolean throwError, TRAPS) {
3482 // Security Note:
3483 // The Java level wrapper will perform the necessary security check allowing
3484 // us to pass the NULL as the initiating class loader. The VM is responsible for
3485 // the checkPackageAccess relative to the initiating class loader via the
3486 // protection_domain. The protection_domain is passed as NULL by the java code
3487 // if there is no security manager in 3-arg Class.forName().
3488 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3489
3490 // Check if we should initialize the class
3491 if (init && klass->is_instance_klass()) {
3492 klass->initialize(CHECK_NULL);
3493 }
3494 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3495 }
3496
3497
3498 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3499
3500 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3501 JVMWrapper("JVM_InvokeMethod");
3502 Handle method_handle;
3503 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3504 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3505 Handle receiver(THREAD, JNIHandles::resolve(obj));
3506 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3507 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3508 jobject res = JNIHandles::make_local(env, result);
3509 if (JvmtiExport::should_post_vm_object_alloc()) {
3510 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3511 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3512 if (java_lang_Class::is_primitive(ret_type)) {
3513 // Only for primitive type vm allocates memory for java object.
3514 // See box() method.
3515 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3516 }
3517 }
3518 return res;
3519 } else {
3520 THROW_0(vmSymbols::java_lang_StackOverflowError());
3521 }
3522 JVM_END
3523
3524
3525 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3526 JVMWrapper("JVM_NewInstanceFromConstructor");
3527 oop constructor_mirror = JNIHandles::resolve(c);
3528 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3529 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3530 jobject res = JNIHandles::make_local(env, result);
3531 if (JvmtiExport::should_post_vm_object_alloc()) {
3532 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3533 }
3534 return res;
3535 JVM_END
3536
3537 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3538
3539 JVM_LEAF(jboolean, JVM_SupportsCX8())
3540 JVMWrapper("JVM_SupportsCX8");
3541 return VM_Version::supports_cx8();
3542 JVM_END
3543
3544 // Returns an array of all live Thread objects (VM internal JavaThreads,
3545 // jvmti agent threads, and JNI attaching threads are skipped)
3546 // See CR 6404306 regarding JNI attaching threads
3547 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3548 ResourceMark rm(THREAD);
3549 ThreadsListEnumerator tle(THREAD, false, false);
3550 JvmtiVMObjectAllocEventCollector oam;
3551
3552 int num_threads = tle.num_threads();
3553 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3554 objArrayHandle threads_ah(THREAD, r);
3555
3556 for (int i = 0; i < num_threads; i++) {
3557 Handle h = tle.get_threadObj(i);
3558 threads_ah->obj_at_put(i, h());
3559 }
3560
3561 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3562 JVM_END
3563
3564
3565 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3566 // Return StackTraceElement[][], each element is the stack trace of a thread in
3567 // the corresponding entry in the given threads array
3568 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3569 JVMWrapper("JVM_DumpThreads");
3570 JvmtiVMObjectAllocEventCollector oam;
3571
3572 // Check if threads is null
3573 if (threads == NULL) {
3574 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3575 }
3576
3577 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3578 objArrayHandle ah(THREAD, a);
3579 int num_threads = ah->length();
3580 // check if threads is non-empty array
3581 if (num_threads == 0) {
3582 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3583 }
3584
3585 // check if threads is not an array of objects of Thread class
3586 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3587 if (k != SystemDictionary::Thread_klass()) {
3588 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3589 }
3590
3591 ResourceMark rm(THREAD);
3592
3593 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3594 for (int i = 0; i < num_threads; i++) {
3595 oop thread_obj = ah->obj_at(i);
3596 instanceHandle h(THREAD, (instanceOop) thread_obj);
3597 thread_handle_array->append(h);
3598 }
3599
3600 // The JavaThread references in thread_handle_array are validated
3601 // in VM_ThreadDump::doit().
3602 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3603 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3604
3605 JVM_END
3606
3607 // JVM monitoring and management support
3608 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3609 return Management::get_jmm_interface(version);
3610 JVM_END
3611
3612 // com.sun.tools.attach.VirtualMachine agent properties support
3613 //
3614 // Initialize the agent properties with the properties maintained in the VM
3615 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3616 JVMWrapper("JVM_InitAgentProperties");
3617 ResourceMark rm;
3618
3619 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3620
3621 PUTPROP(props, "sun.java.command", Arguments::java_command());
3622 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3623 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3624 return properties;
3625 JVM_END
3626
3627 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3628 {
3629 JVMWrapper("JVM_GetEnclosingMethodInfo");
3630 JvmtiVMObjectAllocEventCollector oam;
3631
3632 if (ofClass == NULL) {
3633 return NULL;
3634 }
3635 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3636 // Special handling for primitive objects
3637 if (java_lang_Class::is_primitive(mirror())) {
3638 return NULL;
3639 }
3640 Klass* k = java_lang_Class::as_Klass(mirror());
3641 if (!k->is_instance_klass()) {
3642 return NULL;
3643 }
3644 InstanceKlass* ik = InstanceKlass::cast(k);
3645 int encl_method_class_idx = ik->enclosing_method_class_index();
3646 if (encl_method_class_idx == 0) {
3647 return NULL;
3648 }
3649 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3650 objArrayHandle dest(THREAD, dest_o);
3651 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3652 dest->obj_at_put(0, enc_k->java_mirror());
3653 int encl_method_method_idx = ik->enclosing_method_method_index();
3654 if (encl_method_method_idx != 0) {
3655 Symbol* sym = ik->constants()->symbol_at(
3656 extract_low_short_from_int(
3657 ik->constants()->name_and_type_at(encl_method_method_idx)));
3658 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3659 dest->obj_at_put(1, str());
3660 sym = ik->constants()->symbol_at(
3661 extract_high_short_from_int(
3662 ik->constants()->name_and_type_at(encl_method_method_idx)));
3663 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3664 dest->obj_at_put(2, str());
3665 }
3666 return (jobjectArray) JNIHandles::make_local(dest());
3667 }
3668 JVM_END
3669
3670 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3671 {
3672 memset(info, 0, info_size);
3673
3674 info->jvm_version = Abstract_VM_Version::jvm_version();
3675 info->patch_version = Abstract_VM_Version::vm_patch_version();
3676
3677 // when we add a new capability in the jvm_version_info struct, we should also
3678 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3679 // counter defined in runtimeService.cpp.
3680 info->is_attach_supported = AttachListener::is_attach_supported();
3681 }
3682 JVM_END
3683
3684 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3685 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3686 ResourceMark rm(THREAD);
3687
3688 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3689 return NULL;
3690 }
3691
3692 char** vm_flags = Arguments::jvm_flags_array();
3693 char** vm_args = Arguments::jvm_args_array();
3694 int num_flags = Arguments::num_jvm_flags();
3695 int num_args = Arguments::num_jvm_args();
3696
3697 InstanceKlass* ik = SystemDictionary::String_klass();
3698 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3699 objArrayHandle result_h(THREAD, r);
3700
3701 int index = 0;
3702 for (int j = 0; j < num_flags; j++, index++) {
3703 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3704 result_h->obj_at_put(index, h());
3705 }
3706 for (int i = 0; i < num_args; i++, index++) {
3707 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3708 result_h->obj_at_put(index, h());
3709 }
3710 return (jobjectArray) JNIHandles::make_local(env, result_h());
3711 JVM_END
3712
3713 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3714 return os::get_signal_number(name);
3715 JVM_END