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 "jfr/jfrEvents.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/referenceType.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "memory/universe.hpp"
45 #include "oops/access.inline.hpp"
46 #include "oops/fieldStreams.hpp"
47 #include "oops/instanceKlass.hpp"
48 #include "oops/method.hpp"
49 #include "oops/objArrayKlass.hpp"
50 #include "oops/objArrayOop.inline.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "oops/valueArrayKlass.hpp"
53 #include "prims/jvm_misc.hpp"
54 #include "prims/jvmtiExport.hpp"
55 #include "prims/jvmtiThreadState.hpp"
56 #include "prims/nativeLookup.hpp"
57 #include "prims/privilegedStack.hpp"
58 #include "prims/stackwalk.hpp"
59 #include "runtime/arguments.hpp"
60 #include "runtime/atomic.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/init.hpp"
63 #include "runtime/interfaceSupport.inline.hpp"
64 #include "runtime/java.hpp"
65 #include "runtime/javaCalls.hpp"
66 #include "runtime/jfieldIDWorkaround.hpp"
67 #include "runtime/jniHandles.inline.hpp"
68 #include "runtime/orderAccess.inline.hpp"
69 #include "runtime/os.inline.hpp"
70 #include "runtime/perfData.hpp"
71 #include "runtime/reflection.hpp"
72 #include "runtime/thread.inline.hpp"
73 #include "runtime/threadSMR.hpp"
74 #include "runtime/vframe.inline.hpp"
75 #include "runtime/vm_operations.hpp"
76 #include "runtime/vm_version.hpp"
77 #include "services/attachListener.hpp"
78 #include "services/management.hpp"
79 #include "services/threadService.hpp"
80 #include "utilities/copy.hpp"
81 #include "utilities/defaultStream.hpp"
82 #include "utilities/dtrace.hpp"
83 #include "utilities/events.hpp"
84 #include "utilities/histogram.hpp"
85 #include "utilities/macros.hpp"
86 #include "utilities/utf8.hpp"
87 #if INCLUDE_CDS
88 #include "classfile/systemDictionaryShared.hpp"
89 #endif
90
91 #include <errno.h>
92
93 /*
94 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
95 such ctors and calls MUST NOT come between an oop declaration/init and its
96 usage because if objects are move this may cause various memory stomps, bus
97 errors and segfaults. Here is a cookbook for causing so called "naked oop
98 failures":
99
100 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
101 JVMWrapper("JVM_GetClassDeclaredFields");
102
103 // Object address to be held directly in mirror & not visible to GC
104 oop mirror = JNIHandles::resolve_non_null(ofClass);
105
106 // If this ctor can hit a safepoint, moving objects around, then
107 ComplexConstructor foo;
108
109 // Boom! mirror may point to JUNK instead of the intended object
110 (some dereference of mirror)
111
112 // Here's another call that may block for GC, making mirror stale
113 MutexLocker ml(some_lock);
114
115 // And here's an initializer that can result in a stale oop
116 // all in one step.
117 oop o = call_that_can_throw_exception(TRAPS);
118
119
120 The solution is to keep the oop declaration BELOW the ctor or function
121 call that might cause a GC, do another resolve to reassign the oop, or
122 consider use of a Handle instead of an oop so there is immunity from object
123 motion. But note that the "QUICK" entries below do not have a handlemark
124 and thus can only support use of handles passed in.
125 */
126
127 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
128 ResourceMark rm;
129 int line_number = -1;
130 const char * source_file = NULL;
131 const char * trace = "explicit";
132 InstanceKlass* caller = NULL;
133 JavaThread* jthread = JavaThread::current();
134 if (jthread->has_last_Java_frame()) {
135 vframeStream vfst(jthread);
136
137 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
138 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
139 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
140 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
141 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
142
143 Method* last_caller = NULL;
144
145 while (!vfst.at_end()) {
146 Method* m = vfst.method();
147 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
148 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
149 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
150 break;
151 }
152 last_caller = m;
153 vfst.next();
154 }
155 // if this is called from Class.forName0 and that is called from Class.forName,
156 // then print the caller of Class.forName. If this is Class.loadClass, then print
157 // that caller, otherwise keep quiet since this should be picked up elsewhere.
158 bool found_it = false;
159 if (!vfst.at_end() &&
160 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
161 vfst.method()->name() == vmSymbols::forName0_name()) {
162 vfst.next();
163 if (!vfst.at_end() &&
164 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
165 vfst.method()->name() == vmSymbols::forName_name()) {
166 vfst.next();
167 found_it = true;
168 }
169 } else if (last_caller != NULL &&
170 last_caller->method_holder()->name() ==
171 vmSymbols::java_lang_ClassLoader() &&
172 last_caller->name() == vmSymbols::loadClass_name()) {
173 found_it = true;
174 } else if (!vfst.at_end()) {
175 if (vfst.method()->is_native()) {
176 // JNI call
177 found_it = true;
178 }
179 }
180 if (found_it && !vfst.at_end()) {
181 // found the caller
182 caller = vfst.method()->method_holder();
183 line_number = vfst.method()->line_number_from_bci(vfst.bci());
184 if (line_number == -1) {
185 // show method name if it's a native method
186 trace = vfst.method()->name_and_sig_as_C_string();
187 }
188 Symbol* s = caller->source_file_name();
189 if (s != NULL) {
190 source_file = s->as_C_string();
191 }
192 }
193 }
194 if (caller != NULL) {
195 if (to_class != caller) {
196 const char * from = caller->external_name();
197 const char * to = to_class->external_name();
198 // print in a single call to reduce interleaving between threads
199 if (source_file != NULL) {
200 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
201 } else {
202 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
203 }
204 }
205 }
206 }
207
208 void trace_class_resolution(Klass* to_class) {
209 EXCEPTION_MARK;
210 trace_class_resolution_impl(to_class, THREAD);
211 if (HAS_PENDING_EXCEPTION) {
212 CLEAR_PENDING_EXCEPTION;
213 }
214 }
215
216 // Wrapper to trace JVM functions
217
218 #ifdef ASSERT
219 Histogram* JVMHistogram;
220 volatile int JVMHistogram_lock = 0;
221
222 class JVMHistogramElement : public HistogramElement {
223 public:
224 JVMHistogramElement(const char* name);
225 };
226
227 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
228 _name = elementName;
229 uintx count = 0;
230
231 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
232 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
233 count +=1;
234 if ( (WarnOnStalledSpinLock > 0)
235 && (count % WarnOnStalledSpinLock == 0)) {
236 warning("JVMHistogram_lock seems to be stalled");
237 }
238 }
239 }
240
241 if(JVMHistogram == NULL)
242 JVMHistogram = new Histogram("JVM Call Counts",100);
243
244 JVMHistogram->add_element(this);
245 Atomic::dec(&JVMHistogram_lock);
246 }
247
248 #define JVMCountWrapper(arg) \
249 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
250 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
251
252 #define JVMWrapper(arg) JVMCountWrapper(arg);
253 #else
254 #define JVMWrapper(arg)
255 #endif
256
257
258 // Interface version /////////////////////////////////////////////////////////////////////
259
260
261 JVM_LEAF(jint, JVM_GetInterfaceVersion())
262 return JVM_INTERFACE_VERSION;
263 JVM_END
264
265
266 // java.lang.System //////////////////////////////////////////////////////////////////////
267
268
269 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
270 JVMWrapper("JVM_CurrentTimeMillis");
271 return os::javaTimeMillis();
272 JVM_END
273
274 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
275 JVMWrapper("JVM_NanoTime");
276 return os::javaTimeNanos();
277 JVM_END
278
279 // The function below is actually exposed by jdk.internal.misc.VM and not
280 // java.lang.System, but we choose to keep it here so that it stays next
281 // to JVM_CurrentTimeMillis and JVM_NanoTime
282
283 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
284 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
285
286 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
287 JVMWrapper("JVM_GetNanoTimeAdjustment");
288 jlong seconds;
289 jlong nanos;
290
291 os::javaTimeSystemUTC(seconds, nanos);
292
293 // We're going to verify that the result can fit in a long.
294 // For that we need the difference in seconds between 'seconds'
295 // and 'offset_secs' to be such that:
296 // |seconds - offset_secs| < (2^63/10^9)
297 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
298 // which makes |seconds - offset_secs| < 2^33
299 // and we will prefer +/- 2^32 as the maximum acceptable diff
300 // as 2^32 has a more natural feel than 2^33...
301 //
302 // So if |seconds - offset_secs| >= 2^32 - we return a special
303 // sentinel value (-1) which the caller should take as an
304 // exception value indicating that the offset given to us is
305 // too far from range of the current time - leading to too big
306 // a nano adjustment. The caller is expected to recover by
307 // computing a more accurate offset and calling this method
308 // again. (For the record 2^32 secs is ~136 years, so that
309 // should rarely happen)
310 //
311 jlong diff = seconds - offset_secs;
312 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
313 return -1; // sentinel value: the offset is too far off the target
314 }
315
316 // return the adjustment. If you compute a time by adding
317 // this number of nanoseconds along with the number of seconds
318 // in the offset you should get the current UTC time.
319 return (diff * (jlong)1000000000) + nanos;
320 JVM_END
321
322 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
323 jobject dst, jint dst_pos, jint length))
324 JVMWrapper("JVM_ArrayCopy");
325 // Check if we have null pointers
326 if (src == NULL || dst == NULL) {
327 THROW(vmSymbols::java_lang_NullPointerException());
328 }
329 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
330 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
331 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
332 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
333 // Do copy
334 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
335 JVM_END
336
337
338 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
339 JavaValue r(T_OBJECT);
340 // public synchronized Object put(Object key, Object value);
341 HandleMark hm(THREAD);
342 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
343 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
344 JavaCalls::call_virtual(&r,
345 props,
346 SystemDictionary::Properties_klass(),
347 vmSymbols::put_name(),
348 vmSymbols::object_object_object_signature(),
349 key_str,
350 value_str,
351 THREAD);
352 }
353
354
355 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
356
357
358 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
359 JVMWrapper("JVM_InitProperties");
360 ResourceMark rm;
361
362 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
363
364 // System property list includes both user set via -D option and
365 // jvm system specific properties.
366 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
367 PUTPROP(props, p->key(), p->value());
368 }
369
370 // Convert the -XX:MaxDirectMemorySize= command line flag
371 // to the sun.nio.MaxDirectMemorySize property.
372 // Do this after setting user properties to prevent people
373 // from setting the value with a -D option, as requested.
374 {
375 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
376 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
377 } else {
378 char as_chars[256];
379 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
380 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
381 }
382 }
383
384 // JVM monitoring and management support
385 // Add the sun.management.compiler property for the compiler's name
386 {
387 #undef CSIZE
388 #if defined(_LP64) || defined(_WIN64)
389 #define CSIZE "64-Bit "
390 #else
391 #define CSIZE
392 #endif // 64bit
393
394 #ifdef TIERED
395 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
396 #else
397 #if defined(COMPILER1)
398 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
399 #elif defined(COMPILER2)
400 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
401 #elif INCLUDE_JVMCI
402 #error "INCLUDE_JVMCI should imply TIERED"
403 #else
404 const char* compiler_name = "";
405 #endif // compilers
406 #endif // TIERED
407
408 if (*compiler_name != '\0' &&
409 (Arguments::mode() != Arguments::_int)) {
410 PUTPROP(props, "sun.management.compiler", compiler_name);
411 }
412 }
413
414 return properties;
415 JVM_END
416
417
418 /*
419 * Return the temporary directory that the VM uses for the attach
420 * and perf data files.
421 *
422 * It is important that this directory is well-known and the
423 * same for all VM instances. It cannot be affected by configuration
424 * variables such as java.io.tmpdir.
425 */
426 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
427 JVMWrapper("JVM_GetTemporaryDirectory");
428 HandleMark hm(THREAD);
429 const char* temp_dir = os::get_temp_directory();
430 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
431 return (jstring) JNIHandles::make_local(env, h());
432 JVM_END
433
434
435 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
436
437 extern volatile jint vm_created;
438
439 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
440 JVMWrapper("JVM_BeforeHalt");
441 EventShutdown event;
442 if (event.should_commit()) {
443 event.set_reason("Shutdown requested from Java");
444 event.commit();
445 }
446 JVM_END
447
448
449 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
450 before_exit(thread);
451 vm_exit(code);
452 JVM_END
453
454
455 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
456 JVMWrapper("JVM_GC");
457 if (!DisableExplicitGC) {
458 Universe::heap()->collect(GCCause::_java_lang_system_gc);
459 }
460 JVM_END
461
462
463 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
464 JVMWrapper("JVM_MaxObjectInspectionAge");
465 return Universe::heap()->millis_since_last_gc();
466 JVM_END
467
468
469 static inline jlong convert_size_t_to_jlong(size_t val) {
470 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
471 NOT_LP64 (return (jlong)val;)
472 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
473 }
474
475 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
476 JVMWrapper("JVM_TotalMemory");
477 size_t n = Universe::heap()->capacity();
478 return convert_size_t_to_jlong(n);
479 JVM_END
480
481
482 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
483 JVMWrapper("JVM_FreeMemory");
484 CollectedHeap* ch = Universe::heap();
485 size_t n;
486 {
487 MutexLocker x(Heap_lock);
488 n = ch->capacity() - ch->used();
489 }
490 return convert_size_t_to_jlong(n);
491 JVM_END
492
493
494 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
495 JVMWrapper("JVM_MaxMemory");
496 size_t n = Universe::heap()->max_capacity();
497 return convert_size_t_to_jlong(n);
498 JVM_END
499
500
501 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
502 JVMWrapper("JVM_ActiveProcessorCount");
503 return os::active_processor_count();
504 JVM_END
505
506
507
508 // java.lang.Throwable //////////////////////////////////////////////////////
509
510
511 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
512 JVMWrapper("JVM_FillInStackTrace");
513 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
514 java_lang_Throwable::fill_in_stack_trace(exception);
515 JVM_END
516
517
518 // java.lang.StackTraceElement //////////////////////////////////////////////
519
520
521 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
522 JVMWrapper("JVM_InitStackTraceElementArray");
523 Handle exception(THREAD, JNIHandles::resolve(throwable));
524 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
525 objArrayHandle stack_trace(THREAD, st);
526 // Fill in the allocated stack trace
527 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
528 JVM_END
529
530
531 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
532 JVMWrapper("JVM_InitStackTraceElement");
533 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
534 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
535 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
536 JVM_END
537
538
539 // java.lang.StackWalker //////////////////////////////////////////////////////
540
541
542 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
543 jint skip_frames, jint frame_count, jint start_index,
544 jobjectArray frames))
545 JVMWrapper("JVM_CallStackWalk");
546 JavaThread* jt = (JavaThread*) THREAD;
547 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
548 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
549 }
550
551 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
552
553 // frames array is a Class<?>[] array when only getting caller reference,
554 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
555 // be null.
556 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
557 objArrayHandle frames_array_h(THREAD, fa);
558
559 int limit = start_index + frame_count;
560 if (frames_array_h->length() < limit) {
561 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
562 }
563
564 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
565 start_index, frames_array_h, CHECK_NULL);
566 return JNIHandles::make_local(env, result);
567 JVM_END
568
569
570 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
571 jint frame_count, jint start_index,
572 jobjectArray frames))
573 JVMWrapper("JVM_MoreStackWalk");
574 JavaThread* jt = (JavaThread*) THREAD;
575
576 // frames array is a Class<?>[] array when only getting caller reference,
577 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
578 // be null.
579 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
580 objArrayHandle frames_array_h(THREAD, fa);
581
582 int limit = start_index+frame_count;
583 if (frames_array_h->length() < limit) {
584 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
585 }
586
587 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
588 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
589 start_index, frames_array_h, THREAD);
590 JVM_END
591
592 // java.lang.Object ///////////////////////////////////////////////
593
594
595 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
596 JVMWrapper("JVM_IHashCode");
597 // as implemented in the classic virtual machine; return 0 if object is NULL
598 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
599 JVM_END
600
601
602 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
603 JVMWrapper("JVM_MonitorWait");
604 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
605 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
606 if (JvmtiExport::should_post_monitor_wait()) {
607 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
608
609 // The current thread already owns the monitor and it has not yet
610 // been added to the wait queue so the current thread cannot be
611 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
612 // event handler cannot accidentally consume an unpark() meant for
613 // the ParkEvent associated with this ObjectMonitor.
614 }
615 ObjectSynchronizer::wait(obj, ms, CHECK);
616 JVM_END
617
618
619 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
620 JVMWrapper("JVM_MonitorNotify");
621 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
622 ObjectSynchronizer::notify(obj, CHECK);
623 JVM_END
624
625
626 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
627 JVMWrapper("JVM_MonitorNotifyAll");
628 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
629 ObjectSynchronizer::notifyall(obj, CHECK);
630 JVM_END
631
632
633 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
634 JVMWrapper("JVM_Clone");
635 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
636 Klass* klass = obj->klass();
637 JvmtiVMObjectAllocEventCollector oam;
638
639 #ifdef ASSERT
640 // Just checking that the cloneable flag is set correct
641 if (obj->is_array()) {
642 guarantee(klass->is_cloneable(), "all arrays are cloneable");
643 } else {
644 guarantee(obj->is_instance(), "should be instanceOop");
645 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
646 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
647 }
648 #endif
649
650 // Check if class of obj supports the Cloneable interface.
651 // All arrays are considered to be cloneable (See JLS 20.1.5).
652 // All j.l.r.Reference classes are considered non-cloneable.
653 if (!klass->is_cloneable() ||
654 (klass->is_instance_klass() &&
655 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
656 ResourceMark rm(THREAD);
657 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
658 }
659 assert(!EnableValhalla || !obj->klass()->is_value(), "Clone disallowed on value type");
660
661 // Make shallow object copy
662 const int size = obj->size();
663 oop new_obj_oop = NULL;
664 if (obj->is_array()) {
665 const int length = ((arrayOop)obj())->length();
666 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
667 } else {
668 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
669 }
670
671 HeapAccess<>::clone(obj(), new_obj_oop, size);
672
673 Handle new_obj(THREAD, new_obj_oop);
674 // Caution: this involves a java upcall, so the clone should be
675 // "gc-robust" by this stage.
676 if (klass->has_finalizer()) {
677 assert(obj->is_instance(), "should be instanceOop");
678 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
679 new_obj = Handle(THREAD, new_obj_oop);
680 }
681
682 return JNIHandles::make_local(env, new_obj());
683 JVM_END
684
685 // java.io.File ///////////////////////////////////////////////////////////////
686
687 JVM_LEAF(char*, JVM_NativePath(char* path))
688 JVMWrapper("JVM_NativePath");
689 return os::native_path(path);
690 JVM_END
691
692
693 // Misc. class handling ///////////////////////////////////////////////////////////
694
695
696 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
697 JVMWrapper("JVM_GetCallerClass");
698
699 // Getting the class of the caller frame.
700 //
701 // The call stack at this point looks something like this:
702 //
703 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
704 // [1] [ @CallerSensitive API.method ]
705 // [.] [ (skipped intermediate frames) ]
706 // [n] [ caller ]
707 vframeStream vfst(thread);
708 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
709 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
710 Method* m = vfst.method();
711 assert(m != NULL, "sanity");
712 switch (n) {
713 case 0:
714 // This must only be called from Reflection.getCallerClass
715 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
716 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
717 }
718 // fall-through
719 case 1:
720 // Frame 0 and 1 must be caller sensitive.
721 if (!m->caller_sensitive()) {
722 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
723 }
724 break;
725 default:
726 if (!m->is_ignored_by_security_stack_walk()) {
727 // We have reached the desired frame; return the holder class.
728 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
729 }
730 break;
731 }
732 }
733 return NULL;
734 JVM_END
735
736
737 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
738 JVMWrapper("JVM_FindPrimitiveClass");
739 oop mirror = NULL;
740 BasicType t = name2type(utf);
741 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
742 mirror = Universe::java_mirror(t);
743 }
744 if (mirror == NULL) {
745 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
746 } else {
747 return (jclass) JNIHandles::make_local(env, mirror);
748 }
749 JVM_END
750
751
752 // Returns a class loaded by the bootstrap class loader; or null
753 // if not found. ClassNotFoundException is not thrown.
754 // FindClassFromBootLoader is exported to the launcher for windows.
755 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
756 const char* name))
757 JVMWrapper("JVM_FindClassFromBootLoader");
758
759 // Java libraries should ensure that name is never null...
760 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
761 // It's impossible to create this class; the name cannot fit
762 // into the constant pool.
763 return NULL;
764 }
765
766 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
767 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
768 if (k == NULL) {
769 return NULL;
770 }
771
772 if (log_is_enabled(Debug, class, resolve)) {
773 trace_class_resolution(k);
774 }
775 return (jclass) JNIHandles::make_local(env, k->java_mirror());
776 JVM_END
777
778 // Find a class with this name in this loader, using the caller's protection domain.
779 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
780 jboolean init, jobject loader,
781 jclass caller))
782 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
783 // Java libraries should ensure that name is never null...
784 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
785 // It's impossible to create this class; the name cannot fit
786 // into the constant pool.
787 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
788 }
789
790 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
791
792 oop loader_oop = JNIHandles::resolve(loader);
793 oop from_class = JNIHandles::resolve(caller);
794 oop protection_domain = NULL;
795 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
796 // NPE. Put it in another way, the bootstrap class loader has all permission and
797 // thus no checkPackageAccess equivalence in the VM class loader.
798 // The caller is also passed as NULL by the java code if there is no security
799 // manager to avoid the performance cost of getting the calling class.
800 if (from_class != NULL && loader_oop != NULL) {
801 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
802 }
803
804 Handle h_loader(THREAD, loader_oop);
805 Handle h_prot(THREAD, protection_domain);
806 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
807 h_prot, false, THREAD);
808
809 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
810 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
811 }
812 return result;
813 JVM_END
814
815 // Currently only called from the old verifier.
816 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
817 jboolean init, jclass from))
818 JVMWrapper("JVM_FindClassFromClass");
819 if (name == NULL) {
820 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
821 }
822 if ((int)strlen(name) > Symbol::max_length()) {
823 // It's impossible to create this class; the name cannot fit
824 // into the constant pool.
825 Exceptions::fthrow(THREAD_AND_LOCATION,
826 vmSymbols::java_lang_NoClassDefFoundError(),
827 "Class name exceeds maximum length of %d: %s",
828 Symbol::max_length(),
829 name);
830 return 0;
831 }
832 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
833 oop from_class_oop = JNIHandles::resolve(from);
834 Klass* from_class = (from_class_oop == NULL)
835 ? (Klass*)NULL
836 : java_lang_Class::as_Klass(from_class_oop);
837 oop class_loader = NULL;
838 oop protection_domain = NULL;
839 if (from_class != NULL) {
840 class_loader = from_class->class_loader();
841 protection_domain = from_class->protection_domain();
842 }
843 Handle h_loader(THREAD, class_loader);
844 Handle h_prot (THREAD, protection_domain);
845 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
846 h_prot, true, thread);
847 if (result != NULL) {
848 oop mirror = JNIHandles::resolve_non_null(result);
849 Klass* to_class = java_lang_Class::as_Klass(mirror);
850 ClassLoaderData::class_loader_data(h_loader())->record_dependency(to_class);
851 }
852
853 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
854 // this function is generally only used for class loading during verification.
855 ResourceMark rm;
856 oop from_mirror = JNIHandles::resolve_non_null(from);
857 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
858 const char * from_name = from_class->external_name();
859
860 oop mirror = JNIHandles::resolve_non_null(result);
861 Klass* to_class = java_lang_Class::as_Klass(mirror);
862 const char * to = to_class->external_name();
863 log_debug(class, resolve)("%s %s (verification)", from_name, to);
864 }
865
866 return result;
867 JVM_END
868
869 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
870 if (loader.is_null()) {
871 return;
872 }
873
874 // check whether the current caller thread holds the lock or not.
875 // If not, increment the corresponding counter
876 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
877 ObjectSynchronizer::owner_self) {
878 counter->inc();
879 }
880 }
881
882 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
883 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
884 jobject loader, const jbyte *buf,
885 jsize len, jobject pd, const char *source,
886 TRAPS) {
887 if (source == NULL) source = "__JVM_DefineClass__";
888
889 assert(THREAD->is_Java_thread(), "must be a JavaThread");
890 JavaThread* jt = (JavaThread*) THREAD;
891
892 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
893 ClassLoader::perf_define_appclass_selftime(),
894 ClassLoader::perf_define_appclasses(),
895 jt->get_thread_stat()->perf_recursion_counts_addr(),
896 jt->get_thread_stat()->perf_timers_addr(),
897 PerfClassTraceTime::DEFINE_CLASS);
898
899 if (UsePerfData) {
900 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
901 }
902
903 // Since exceptions can be thrown, class initialization can take place
904 // if name is NULL no check for class name in .class stream has to be made.
905 TempNewSymbol class_name = NULL;
906 if (name != NULL) {
907 const int str_len = (int)strlen(name);
908 if (str_len > Symbol::max_length()) {
909 // It's impossible to create this class; the name cannot fit
910 // into the constant pool.
911 Exceptions::fthrow(THREAD_AND_LOCATION,
912 vmSymbols::java_lang_NoClassDefFoundError(),
913 "Class name exceeds maximum length of %d: %s",
914 Symbol::max_length(),
915 name);
916 return 0;
917 }
918 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
919 }
920
921 ResourceMark rm(THREAD);
922 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
923 Handle class_loader (THREAD, JNIHandles::resolve(loader));
924 if (UsePerfData) {
925 is_lock_held_by_thread(class_loader,
926 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
927 THREAD);
928 }
929 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
930 Klass* k = SystemDictionary::resolve_from_stream(class_name,
931 class_loader,
932 protection_domain,
933 &st,
934 CHECK_NULL);
935
936 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
937 trace_class_resolution(k);
938 }
939
940 return (jclass) JNIHandles::make_local(env, k->java_mirror());
941 }
942
943
944 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
945 JVMWrapper("JVM_DefineClass");
946
947 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
948 JVM_END
949
950
951 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
952 JVMWrapper("JVM_DefineClassWithSource");
953
954 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
955 JVM_END
956
957 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
958 JVMWrapper("JVM_FindLoadedClass");
959 ResourceMark rm(THREAD);
960
961 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
962 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
963
964 const char* str = java_lang_String::as_utf8_string(string());
965 // Sanity check, don't expect null
966 if (str == NULL) return NULL;
967
968 const int str_len = (int)strlen(str);
969 if (str_len > Symbol::max_length()) {
970 // It's impossible to create this class; the name cannot fit
971 // into the constant pool.
972 return NULL;
973 }
974 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
975
976 // Security Note:
977 // The Java level wrapper will perform the necessary security check allowing
978 // us to pass the NULL as the initiating class loader.
979 Handle h_loader(THREAD, JNIHandles::resolve(loader));
980 if (UsePerfData) {
981 is_lock_held_by_thread(h_loader,
982 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
983 THREAD);
984 }
985
986 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
987 h_loader,
988 Handle(),
989 CHECK_NULL);
990 #if INCLUDE_CDS
991 if (k == NULL) {
992 // If the class is not already loaded, try to see if it's in the shared
993 // archive for the current classloader (h_loader).
994 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
995 }
996 #endif
997 return (k == NULL) ? NULL :
998 (jclass) JNIHandles::make_local(env, k->java_mirror());
999 JVM_END
1000
1001 // Module support //////////////////////////////////////////////////////////////////////////////
1002
1003 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1004 jstring location, const char* const* packages, jsize num_packages))
1005 JVMWrapper("JVM_DefineModule");
1006 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1007 JVM_END
1008
1009 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1010 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1011 Modules::set_bootloader_unnamed_module(module, CHECK);
1012 JVM_END
1013
1014 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1015 JVMWrapper("JVM_AddModuleExports");
1016 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1017 JVM_END
1018
1019 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1020 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1021 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1022 JVM_END
1023
1024 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1025 JVMWrapper("JVM_AddModuleExportsToAll");
1026 Modules::add_module_exports(from_module, package, NULL, CHECK);
1027 JVM_END
1028
1029 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1030 JVMWrapper("JVM_AddReadsModule");
1031 Modules::add_reads_module(from_module, source_module, CHECK);
1032 JVM_END
1033
1034 // Reflection support //////////////////////////////////////////////////////////////////////////////
1035
1036 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1037 assert (cls != NULL, "illegal class");
1038 JVMWrapper("JVM_GetClassName");
1039 JvmtiVMObjectAllocEventCollector oam;
1040 ResourceMark rm(THREAD);
1041 const char* name;
1042 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1043 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1044 } else {
1045 // Consider caching interned string in Klass
1046 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1047 assert(k->is_klass(), "just checking");
1048 name = k->external_name();
1049 }
1050 oop result = StringTable::intern((char*) name, CHECK_NULL);
1051 return (jstring) JNIHandles::make_local(env, result);
1052 JVM_END
1053
1054
1055 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1056 JVMWrapper("JVM_GetClassInterfaces");
1057 JvmtiVMObjectAllocEventCollector oam;
1058 oop mirror = JNIHandles::resolve_non_null(cls);
1059
1060 // Special handling for primitive objects
1061 if (java_lang_Class::is_primitive(mirror)) {
1062 // Primitive objects does not have any interfaces
1063 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1064 return (jobjectArray) JNIHandles::make_local(env, r);
1065 }
1066
1067 Klass* klass = java_lang_Class::as_Klass(mirror);
1068 // Figure size of result array
1069 int size;
1070 if (klass->is_instance_klass()) {
1071 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1072 } else {
1073 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1074 size = 2;
1075 }
1076
1077 // Allocate result array
1078 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1079 objArrayHandle result (THREAD, r);
1080 // Fill in result
1081 if (klass->is_instance_klass()) {
1082 // Regular instance klass, fill in all local interfaces
1083 for (int index = 0; index < size; index++) {
1084 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1085 result->obj_at_put(index, k->java_mirror());
1086 }
1087 } else {
1088 // All arrays implement java.lang.Cloneable and java.io.Serializable
1089 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1090 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1091 }
1092 return (jobjectArray) JNIHandles::make_local(env, result());
1093 JVM_END
1094
1095
1096 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1097 JVMWrapper("JVM_IsInterface");
1098 oop mirror = JNIHandles::resolve_non_null(cls);
1099 if (java_lang_Class::is_primitive(mirror)) {
1100 return JNI_FALSE;
1101 }
1102 Klass* k = java_lang_Class::as_Klass(mirror);
1103 jboolean result = k->is_interface();
1104 assert(!result || k->is_instance_klass(),
1105 "all interfaces are instance types");
1106 // The compiler intrinsic for isInterface tests the
1107 // Klass::_access_flags bits in the same way.
1108 return result;
1109 JVM_END
1110
1111
1112 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1113 JVMWrapper("JVM_GetClassSigners");
1114 JvmtiVMObjectAllocEventCollector oam;
1115 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1116 // There are no signers for primitive types
1117 return NULL;
1118 }
1119
1120 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1121
1122 // If there are no signers set in the class, or if the class
1123 // is an array, return NULL.
1124 if (signers == NULL) return NULL;
1125
1126 // copy of the signers array
1127 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1128 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1129 for (int index = 0; index < signers->length(); index++) {
1130 signers_copy->obj_at_put(index, signers->obj_at(index));
1131 }
1132
1133 // return the copy
1134 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1135 JVM_END
1136
1137
1138 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1139 JVMWrapper("JVM_SetClassSigners");
1140 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1141 // This call is ignored for primitive types and arrays.
1142 // Signers are only set once, ClassLoader.java, and thus shouldn't
1143 // be called with an array. Only the bootstrap loader creates arrays.
1144 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1145 if (k->is_instance_klass()) {
1146 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1147 }
1148 }
1149 JVM_END
1150
1151
1152 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1153 JVMWrapper("JVM_GetProtectionDomain");
1154 if (JNIHandles::resolve(cls) == NULL) {
1155 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1156 }
1157
1158 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1159 // Primitive types does not have a protection domain.
1160 return NULL;
1161 }
1162
1163 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1164 return (jobject) JNIHandles::make_local(env, pd);
1165 JVM_END
1166
1167
1168 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) {
1169 // If there is a security manager and protection domain, check the access
1170 // in the protection domain, otherwise it is authorized.
1171 if (java_lang_System::has_security_manager()) {
1172
1173 // For bootstrapping, if pd implies method isn't in the JDK, allow
1174 // this context to revert to older behavior.
1175 // In this case the isAuthorized field in AccessControlContext is also not
1176 // present.
1177 if (Universe::protection_domain_implies_method() == NULL) {
1178 return true;
1179 }
1180
1181 // Whitelist certain access control contexts
1182 if (java_security_AccessControlContext::is_authorized(context)) {
1183 return true;
1184 }
1185
1186 oop prot = klass->protection_domain();
1187 if (prot != NULL) {
1188 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1189 // in the new wrapper.
1190 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1191 Handle h_prot(THREAD, prot);
1192 JavaValue result(T_BOOLEAN);
1193 JavaCallArguments args(h_prot);
1194 JavaCalls::call(&result, m, &args, CHECK_false);
1195 return (result.get_jboolean() != 0);
1196 }
1197 }
1198 return true;
1199 }
1200
1201 // Create an AccessControlContext with a protection domain with null codesource
1202 // and null permissions - which gives no permissions.
1203 oop create_dummy_access_control_context(TRAPS) {
1204 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1205 // Call constructor ProtectionDomain(null, null);
1206 Handle obj = JavaCalls::construct_new_instance(pd_klass,
1207 vmSymbols::codesource_permissioncollection_signature(),
1208 Handle(), Handle(), CHECK_NULL);
1209
1210 // new ProtectionDomain[] {pd};
1211 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1212 context->obj_at_put(0, obj());
1213
1214 // new AccessControlContext(new ProtectionDomain[] {pd})
1215 objArrayHandle h_context(THREAD, context);
1216 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1217 return acc;
1218 }
1219
1220 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1221 JVMWrapper("JVM_DoPrivileged");
1222
1223 if (action == NULL) {
1224 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1225 }
1226
1227 // Compute the frame initiating the do privileged operation and setup the privileged stack
1228 vframeStream vfst(thread);
1229 vfst.security_get_caller_frame(1);
1230
1231 if (vfst.at_end()) {
1232 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1233 }
1234
1235 Method* method = vfst.method();
1236 InstanceKlass* klass = method->method_holder();
1237
1238 // Check that action object understands "Object run()"
1239 Handle h_context;
1240 if (context != NULL) {
1241 h_context = Handle(THREAD, JNIHandles::resolve(context));
1242 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1243 if (!authorized) {
1244 // Create an unprivileged access control object and call it's run function
1245 // instead.
1246 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1247 h_context = Handle(THREAD, noprivs);
1248 }
1249 }
1250
1251 // Check that action object understands "Object run()"
1252 Handle object (THREAD, JNIHandles::resolve(action));
1253
1254 // get run() method
1255 Method* m_oop = object->klass()->uncached_lookup_method(
1256 vmSymbols::run_method_name(),
1257 vmSymbols::void_object_signature(),
1258 Klass::find_overpass);
1259
1260 // See if there is a default method for "Object run()".
1261 if (m_oop == NULL && object->klass()->is_instance_klass()) {
1262 InstanceKlass* iklass = InstanceKlass::cast(object->klass());
1263 m_oop = iklass->lookup_method_in_ordered_interfaces(
1264 vmSymbols::run_method_name(),
1265 vmSymbols::void_object_signature());
1266 }
1267
1268 methodHandle m (THREAD, m_oop);
1269 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) {
1270 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1271 }
1272
1273 // Stack allocated list of privileged stack elements
1274 PrivilegedElement pi;
1275 if (!vfst.at_end()) {
1276 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1277 thread->set_privileged_stack_top(&pi);
1278 }
1279
1280
1281 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1282 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1283 Handle pending_exception;
1284 JavaValue result(T_OBJECT);
1285 JavaCallArguments args(object);
1286 JavaCalls::call(&result, m, &args, THREAD);
1287
1288 // done with action, remove ourselves from the list
1289 if (!vfst.at_end()) {
1290 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1291 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1292 }
1293
1294 if (HAS_PENDING_EXCEPTION) {
1295 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1296 CLEAR_PENDING_EXCEPTION;
1297 // JVMTI has already reported the pending exception
1298 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1299 if (THREAD->is_Java_thread()) {
1300 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1301 }
1302 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1303 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1304 // Throw a java.security.PrivilegedActionException(Exception e) exception
1305 JavaCallArguments args(pending_exception);
1306 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1307 vmSymbols::exception_void_signature(),
1308 &args);
1309 }
1310 }
1311
1312 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1313 return JNIHandles::make_local(env, (oop) result.get_jobject());
1314 JVM_END
1315
1316
1317 // Returns the inherited_access_control_context field of the running thread.
1318 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1319 JVMWrapper("JVM_GetInheritedAccessControlContext");
1320 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1321 return JNIHandles::make_local(env, result);
1322 JVM_END
1323
1324 class RegisterArrayForGC {
1325 private:
1326 JavaThread *_thread;
1327 public:
1328 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1329 _thread = thread;
1330 _thread->register_array_for_gc(array);
1331 }
1332
1333 ~RegisterArrayForGC() {
1334 _thread->register_array_for_gc(NULL);
1335 }
1336 };
1337
1338
1339 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1340 JVMWrapper("JVM_GetStackAccessControlContext");
1341 if (!UsePrivilegedStack) return NULL;
1342
1343 ResourceMark rm(THREAD);
1344 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1345 JvmtiVMObjectAllocEventCollector oam;
1346
1347 // count the protection domains on the execution stack. We collapse
1348 // duplicate consecutive protection domains into a single one, as
1349 // well as stopping when we hit a privileged frame.
1350
1351 // Use vframeStream to iterate through Java frames
1352 vframeStream vfst(thread);
1353
1354 oop previous_protection_domain = NULL;
1355 Handle privileged_context(thread, NULL);
1356 bool is_privileged = false;
1357 oop protection_domain = NULL;
1358
1359 for(; !vfst.at_end(); vfst.next()) {
1360 // get method of frame
1361 Method* method = vfst.method();
1362 intptr_t* frame_id = vfst.frame_id();
1363
1364 // check the privileged frames to see if we have a match
1365 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1366 // this frame is privileged
1367 is_privileged = true;
1368 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1369 protection_domain = thread->privileged_stack_top()->protection_domain();
1370 } else {
1371 protection_domain = method->method_holder()->protection_domain();
1372 }
1373
1374 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) {
1375 local_array->push(protection_domain);
1376 previous_protection_domain = protection_domain;
1377 }
1378
1379 if (is_privileged) break;
1380 }
1381
1382
1383 // either all the domains on the stack were system domains, or
1384 // we had a privileged system domain
1385 if (local_array->is_empty()) {
1386 if (is_privileged && privileged_context.is_null()) return NULL;
1387
1388 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1389 return JNIHandles::make_local(env, result);
1390 }
1391
1392 // the resource area must be registered in case of a gc
1393 RegisterArrayForGC ragc(thread, local_array);
1394 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1395 local_array->length(), CHECK_NULL);
1396 objArrayHandle h_context(thread, context);
1397 for (int index = 0; index < local_array->length(); index++) {
1398 h_context->obj_at_put(index, local_array->at(index));
1399 }
1400
1401 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1402
1403 return JNIHandles::make_local(env, result);
1404 JVM_END
1405
1406
1407 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1408 JVMWrapper("JVM_IsArrayClass");
1409 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1410 return (k != NULL) && k->is_array_klass() ? true : false;
1411 JVM_END
1412
1413
1414 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1415 JVMWrapper("JVM_IsPrimitiveClass");
1416 oop mirror = JNIHandles::resolve_non_null(cls);
1417 return (jboolean) java_lang_Class::is_primitive(mirror);
1418 JVM_END
1419
1420
1421 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1422 JVMWrapper("JVM_GetClassModifiers");
1423 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1424 // Primitive type
1425 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1426 }
1427
1428 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1429 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1430 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1431 return k->modifier_flags();
1432 JVM_END
1433
1434
1435 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1436
1437 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1438 JvmtiVMObjectAllocEventCollector oam;
1439 // ofClass is a reference to a java_lang_Class object. The mirror object
1440 // of an InstanceKlass
1441
1442 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1443 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1444 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1445 return (jobjectArray)JNIHandles::make_local(env, result);
1446 }
1447
1448 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1449 InnerClassesIterator iter(k);
1450
1451 if (iter.length() == 0) {
1452 // Neither an inner nor outer class
1453 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1454 return (jobjectArray)JNIHandles::make_local(env, result);
1455 }
1456
1457 // find inner class info
1458 constantPoolHandle cp(thread, k->constants());
1459 int length = iter.length();
1460
1461 // Allocate temp. result array
1462 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1463 objArrayHandle result (THREAD, r);
1464 int members = 0;
1465
1466 for (; !iter.done(); iter.next()) {
1467 int ioff = iter.inner_class_info_index();
1468 int ooff = iter.outer_class_info_index();
1469
1470 if (ioff != 0 && ooff != 0) {
1471 // Check to see if the name matches the class we're looking for
1472 // before attempting to find the class.
1473 if (cp->klass_name_at_matches(k, ooff)) {
1474 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1475 if (outer_klass == k) {
1476 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1477 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1478
1479 // Throws an exception if outer klass has not declared k as
1480 // an inner klass
1481 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1482
1483 result->obj_at_put(members, inner_klass->java_mirror());
1484 members++;
1485 }
1486 }
1487 }
1488 }
1489
1490 if (members != length) {
1491 // Return array of right length
1492 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1493 for(int i = 0; i < members; i++) {
1494 res->obj_at_put(i, result->obj_at(i));
1495 }
1496 return (jobjectArray)JNIHandles::make_local(env, res);
1497 }
1498
1499 return (jobjectArray)JNIHandles::make_local(env, result());
1500 JVM_END
1501
1502
1503 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1504 {
1505 // ofClass is a reference to a java_lang_Class object.
1506 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1507 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1508 return NULL;
1509 }
1510
1511 bool inner_is_member = false;
1512 Klass* outer_klass
1513 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1514 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1515 if (outer_klass == NULL) return NULL; // already a top-level class
1516 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1517 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1518 }
1519 JVM_END
1520
1521 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1522 {
1523 oop mirror = JNIHandles::resolve_non_null(cls);
1524 if (java_lang_Class::is_primitive(mirror) ||
1525 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1526 return NULL;
1527 }
1528 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1529 int ooff = 0, noff = 0;
1530 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1531 if (noff != 0) {
1532 constantPoolHandle i_cp(thread, k->constants());
1533 Symbol* name = i_cp->symbol_at(noff);
1534 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1535 return (jstring) JNIHandles::make_local(env, str());
1536 }
1537 }
1538 return NULL;
1539 }
1540 JVM_END
1541
1542 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1543 assert (cls != NULL, "illegal class");
1544 JVMWrapper("JVM_GetClassSignature");
1545 JvmtiVMObjectAllocEventCollector oam;
1546 ResourceMark rm(THREAD);
1547 // Return null for arrays and primatives
1548 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1549 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1550 if (k->is_instance_klass()) {
1551 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1552 if (sym == NULL) return NULL;
1553 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1554 return (jstring) JNIHandles::make_local(env, str());
1555 }
1556 }
1557 return NULL;
1558 JVM_END
1559
1560
1561 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1562 assert (cls != NULL, "illegal class");
1563 JVMWrapper("JVM_GetClassAnnotations");
1564
1565 // Return null for arrays and primitives
1566 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1567 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1568 if (k->is_instance_klass()) {
1569 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1570 return (jbyteArray) JNIHandles::make_local(env, a);
1571 }
1572 }
1573 return NULL;
1574 JVM_END
1575
1576
1577 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1578 // some of this code was adapted from from jni_FromReflectedField
1579
1580 oop reflected = JNIHandles::resolve_non_null(field);
1581 oop mirror = java_lang_reflect_Field::clazz(reflected);
1582 Klass* k = java_lang_Class::as_Klass(mirror);
1583 int slot = java_lang_reflect_Field::slot(reflected);
1584 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1585
1586 InstanceKlass* ik = InstanceKlass::cast(k);
1587 intptr_t offset = ik->field_offset(slot);
1588
1589 if (modifiers & JVM_ACC_STATIC) {
1590 // for static fields we only look in the current class
1591 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1592 assert(false, "cannot find static field");
1593 return false;
1594 }
1595 } else {
1596 // for instance fields we start with the current class and work
1597 // our way up through the superclass chain
1598 if (!ik->find_field_from_offset(offset, false, &fd)) {
1599 assert(false, "cannot find instance field");
1600 return false;
1601 }
1602 }
1603 return true;
1604 }
1605
1606 static Method* jvm_get_method_common(jobject method) {
1607 // some of this code was adapted from from jni_FromReflectedMethod
1608
1609 oop reflected = JNIHandles::resolve_non_null(method);
1610 oop mirror = NULL;
1611 int slot = 0;
1612
1613 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1614 mirror = java_lang_reflect_Constructor::clazz(reflected);
1615 slot = java_lang_reflect_Constructor::slot(reflected);
1616 } else {
1617 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1618 "wrong type");
1619 mirror = java_lang_reflect_Method::clazz(reflected);
1620 slot = java_lang_reflect_Method::slot(reflected);
1621 }
1622 Klass* k = java_lang_Class::as_Klass(mirror);
1623
1624 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1625 assert(m != NULL, "cannot find method");
1626 return m; // caller has to deal with NULL in product mode
1627 }
1628
1629 /* Type use annotations support (JDK 1.8) */
1630
1631 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1632 assert (cls != NULL, "illegal class");
1633 JVMWrapper("JVM_GetClassTypeAnnotations");
1634 ResourceMark rm(THREAD);
1635 // Return null for arrays and primitives
1636 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1637 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1638 if (k->is_instance_klass()) {
1639 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1640 if (type_annotations != NULL) {
1641 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1642 return (jbyteArray) JNIHandles::make_local(env, a);
1643 }
1644 }
1645 }
1646 return NULL;
1647 JVM_END
1648
1649 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1650 assert (method != NULL, "illegal method");
1651 JVMWrapper("JVM_GetMethodTypeAnnotations");
1652
1653 // method is a handle to a java.lang.reflect.Method object
1654 Method* m = jvm_get_method_common(method);
1655 if (m == NULL) {
1656 return NULL;
1657 }
1658
1659 AnnotationArray* type_annotations = m->type_annotations();
1660 if (type_annotations != NULL) {
1661 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1662 return (jbyteArray) JNIHandles::make_local(env, a);
1663 }
1664
1665 return NULL;
1666 JVM_END
1667
1668 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1669 assert (field != NULL, "illegal field");
1670 JVMWrapper("JVM_GetFieldTypeAnnotations");
1671
1672 fieldDescriptor fd;
1673 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1674 if (!gotFd) {
1675 return NULL;
1676 }
1677
1678 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1679 JVM_END
1680
1681 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1682 if (!cp->is_within_bounds(index)) {
1683 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1684 }
1685 }
1686
1687 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1688 {
1689 JVMWrapper("JVM_GetMethodParameters");
1690 // method is a handle to a java.lang.reflect.Method object
1691 Method* method_ptr = jvm_get_method_common(method);
1692 methodHandle mh (THREAD, method_ptr);
1693 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1694 const int num_params = mh->method_parameters_length();
1695
1696 if (num_params < 0) {
1697 // A -1 return value from method_parameters_length means there is no
1698 // parameter data. Return null to indicate this to the reflection
1699 // API.
1700 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1701 return (jobjectArray)NULL;
1702 } else {
1703 // Otherwise, we return something up to reflection, even if it is
1704 // a zero-length array. Why? Because in some cases this can
1705 // trigger a MalformedParametersException.
1706
1707 // make sure all the symbols are properly formatted
1708 for (int i = 0; i < num_params; i++) {
1709 MethodParametersElement* params = mh->method_parameters_start();
1710 int index = params[i].name_cp_index;
1711 bounds_check(mh->constants(), index, CHECK_NULL);
1712
1713 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1714 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1715 "Wrong type at constant pool index");
1716 }
1717
1718 }
1719
1720 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1721 objArrayHandle result (THREAD, result_oop);
1722
1723 for (int i = 0; i < num_params; i++) {
1724 MethodParametersElement* params = mh->method_parameters_start();
1725 // For a 0 index, give a NULL symbol
1726 Symbol* sym = 0 != params[i].name_cp_index ?
1727 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1728 int flags = params[i].flags;
1729 oop param = Reflection::new_parameter(reflected_method, i, sym,
1730 flags, CHECK_NULL);
1731 result->obj_at_put(i, param);
1732 }
1733 return (jobjectArray)JNIHandles::make_local(env, result());
1734 }
1735 }
1736 JVM_END
1737
1738 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1739
1740 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1741 {
1742 JVMWrapper("JVM_GetClassDeclaredFields");
1743 JvmtiVMObjectAllocEventCollector oam;
1744
1745 // Exclude primitive types and array types
1746 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1747 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1748 // Return empty array
1749 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1750 return (jobjectArray) JNIHandles::make_local(env, res);
1751 }
1752
1753 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1754 constantPoolHandle cp(THREAD, k->constants());
1755
1756 // Ensure class is linked
1757 k->link_class(CHECK_NULL);
1758
1759 // Allocate result
1760 int num_fields;
1761
1762 if (publicOnly) {
1763 num_fields = 0;
1764 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1765 if (fs.access_flags().is_public()) ++num_fields;
1766 }
1767 } else {
1768 num_fields = k->java_fields_count();
1769 }
1770
1771 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1772 objArrayHandle result (THREAD, r);
1773
1774 int out_idx = 0;
1775 fieldDescriptor fd;
1776 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1777 if (!publicOnly || fs.access_flags().is_public()) {
1778 fd.reinitialize(k, fs.index());
1779 oop field = Reflection::new_field(&fd, CHECK_NULL);
1780 result->obj_at_put(out_idx, field);
1781 ++out_idx;
1782 }
1783 }
1784 assert(out_idx == num_fields, "just checking");
1785 return (jobjectArray) JNIHandles::make_local(env, result());
1786 }
1787 JVM_END
1788
1789 static bool select_method(const methodHandle& method, bool want_constructor) {
1790 if (want_constructor) {
1791 return (method->is_initializer() && !method->is_static());
1792 } else {
1793 return (!method->is_initializer() && !method->is_overpass());
1794 }
1795 }
1796
1797 static jobjectArray get_class_declared_methods_helper(
1798 JNIEnv *env,
1799 jclass ofClass, jboolean publicOnly,
1800 bool want_constructor,
1801 Klass* klass, TRAPS) {
1802
1803 JvmtiVMObjectAllocEventCollector oam;
1804
1805 // Exclude primitive types and array types
1806 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1807 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1808 // Return empty array
1809 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1810 return (jobjectArray) JNIHandles::make_local(env, res);
1811 }
1812
1813 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1814
1815 // Ensure class is linked
1816 k->link_class(CHECK_NULL);
1817
1818 Array<Method*>* methods = k->methods();
1819 int methods_length = methods->length();
1820
1821 // Save original method_idnum in case of redefinition, which can change
1822 // the idnum of obsolete methods. The new method will have the same idnum
1823 // but if we refresh the methods array, the counts will be wrong.
1824 ResourceMark rm(THREAD);
1825 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1826 int num_methods = 0;
1827
1828 for (int i = 0; i < methods_length; i++) {
1829 methodHandle method(THREAD, methods->at(i));
1830 if (select_method(method, want_constructor)) {
1831 if (!publicOnly || method->is_public()) {
1832 idnums->push(method->method_idnum());
1833 ++num_methods;
1834 }
1835 }
1836 }
1837
1838 // Allocate result
1839 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1840 objArrayHandle result (THREAD, r);
1841
1842 // Now just put the methods that we selected above, but go by their idnum
1843 // in case of redefinition. The methods can be redefined at any safepoint,
1844 // so above when allocating the oop array and below when creating reflect
1845 // objects.
1846 for (int i = 0; i < num_methods; i++) {
1847 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1848 if (method.is_null()) {
1849 // Method may have been deleted and seems this API can handle null
1850 // Otherwise should probably put a method that throws NSME
1851 result->obj_at_put(i, NULL);
1852 } else {
1853 oop m;
1854 if (want_constructor) {
1855 m = Reflection::new_constructor(method, CHECK_NULL);
1856 } else {
1857 m = Reflection::new_method(method, false, CHECK_NULL);
1858 }
1859 result->obj_at_put(i, m);
1860 }
1861 }
1862
1863 return (jobjectArray) JNIHandles::make_local(env, result());
1864 }
1865
1866 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1867 {
1868 JVMWrapper("JVM_GetClassDeclaredMethods");
1869 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1870 /*want_constructor*/ false,
1871 SystemDictionary::reflect_Method_klass(), THREAD);
1872 }
1873 JVM_END
1874
1875 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1876 {
1877 JVMWrapper("JVM_GetClassDeclaredConstructors");
1878 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1879 /*want_constructor*/ true,
1880 SystemDictionary::reflect_Constructor_klass(), THREAD);
1881 }
1882 JVM_END
1883
1884 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1885 {
1886 JVMWrapper("JVM_GetClassAccessFlags");
1887 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1888 // Primitive type
1889 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1890 }
1891
1892 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1893 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1894 }
1895 JVM_END
1896
1897
1898 // Constant pool access //////////////////////////////////////////////////////////
1899
1900 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1901 {
1902 JVMWrapper("JVM_GetClassConstantPool");
1903 JvmtiVMObjectAllocEventCollector oam;
1904
1905 // Return null for primitives and arrays
1906 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1907 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1908 if (k->is_instance_klass()) {
1909 InstanceKlass* k_h = InstanceKlass::cast(k);
1910 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1911 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1912 return JNIHandles::make_local(jcp());
1913 }
1914 }
1915 return NULL;
1916 }
1917 JVM_END
1918
1919
1920 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1921 {
1922 JVMWrapper("JVM_ConstantPoolGetSize");
1923 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1924 return cp->length();
1925 }
1926 JVM_END
1927
1928
1929 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1930 {
1931 JVMWrapper("JVM_ConstantPoolGetClassAt");
1932 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1933 bounds_check(cp, index, CHECK_NULL);
1934 constantTag tag = cp->tag_at(index);
1935 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1936 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1937 }
1938 Klass* k = cp->klass_at(index, CHECK_NULL);
1939 return (jclass) JNIHandles::make_local(k->java_mirror());
1940 }
1941 JVM_END
1942
1943 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1944 {
1945 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1946 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1947 bounds_check(cp, index, CHECK_NULL);
1948 constantTag tag = cp->tag_at(index);
1949 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1950 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1951 }
1952 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1953 if (k == NULL) return NULL;
1954 return (jclass) JNIHandles::make_local(k->java_mirror());
1955 }
1956 JVM_END
1957
1958 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1959 constantTag tag = cp->tag_at(index);
1960 if (!tag.is_method() && !tag.is_interface_method()) {
1961 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1962 }
1963 int klass_ref = cp->uncached_klass_ref_index_at(index);
1964 Klass* k_o;
1965 if (force_resolution) {
1966 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1967 } else {
1968 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1969 if (k_o == NULL) return NULL;
1970 }
1971 InstanceKlass* k = InstanceKlass::cast(k_o);
1972 Symbol* name = cp->uncached_name_ref_at(index);
1973 Symbol* sig = cp->uncached_signature_ref_at(index);
1974 methodHandle m (THREAD, k->find_method(name, sig));
1975 if (m.is_null()) {
1976 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1977 }
1978 oop method;
1979 if (!m->is_initializer() || m->is_static()) {
1980 method = Reflection::new_method(m, true, CHECK_NULL);
1981 } else {
1982 method = Reflection::new_constructor(m, CHECK_NULL);
1983 }
1984 return JNIHandles::make_local(method);
1985 }
1986
1987 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1988 {
1989 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1990 JvmtiVMObjectAllocEventCollector oam;
1991 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1992 bounds_check(cp, index, CHECK_NULL);
1993 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1994 return res;
1995 }
1996 JVM_END
1997
1998 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1999 {
2000 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2001 JvmtiVMObjectAllocEventCollector oam;
2002 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2003 bounds_check(cp, index, CHECK_NULL);
2004 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2005 return res;
2006 }
2007 JVM_END
2008
2009 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2010 constantTag tag = cp->tag_at(index);
2011 if (!tag.is_field()) {
2012 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2013 }
2014 int klass_ref = cp->uncached_klass_ref_index_at(index);
2015 Klass* k_o;
2016 if (force_resolution) {
2017 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2018 } else {
2019 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2020 if (k_o == NULL) return NULL;
2021 }
2022 InstanceKlass* k = InstanceKlass::cast(k_o);
2023 Symbol* name = cp->uncached_name_ref_at(index);
2024 Symbol* sig = cp->uncached_signature_ref_at(index);
2025 fieldDescriptor fd;
2026 Klass* target_klass = k->find_field(name, sig, &fd);
2027 if (target_klass == NULL) {
2028 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2029 }
2030 oop field = Reflection::new_field(&fd, CHECK_NULL);
2031 return JNIHandles::make_local(field);
2032 }
2033
2034 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2035 {
2036 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2037 JvmtiVMObjectAllocEventCollector oam;
2038 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2039 bounds_check(cp, index, CHECK_NULL);
2040 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2041 return res;
2042 }
2043 JVM_END
2044
2045 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2046 {
2047 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2048 JvmtiVMObjectAllocEventCollector oam;
2049 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2050 bounds_check(cp, index, CHECK_NULL);
2051 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2052 return res;
2053 }
2054 JVM_END
2055
2056 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2057 {
2058 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2059 JvmtiVMObjectAllocEventCollector oam;
2060 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2061 bounds_check(cp, index, CHECK_NULL);
2062 constantTag tag = cp->tag_at(index);
2063 if (!tag.is_field_or_method()) {
2064 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2065 }
2066 int klass_ref = cp->uncached_klass_ref_index_at(index);
2067 Symbol* klass_name = cp->klass_name_at(klass_ref);
2068 Symbol* member_name = cp->uncached_name_ref_at(index);
2069 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2070 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2071 objArrayHandle dest(THREAD, dest_o);
2072 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2073 dest->obj_at_put(0, str());
2074 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2075 dest->obj_at_put(1, str());
2076 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2077 dest->obj_at_put(2, str());
2078 return (jobjectArray) JNIHandles::make_local(dest());
2079 }
2080 JVM_END
2081
2082 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2083 {
2084 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2085 JvmtiVMObjectAllocEventCollector oam;
2086 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2087 bounds_check(cp, index, CHECK_0);
2088 constantTag tag = cp->tag_at(index);
2089 if (!tag.is_field_or_method()) {
2090 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2091 }
2092 return (jint) cp->uncached_klass_ref_index_at(index);
2093 }
2094 JVM_END
2095
2096 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2097 {
2098 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2099 JvmtiVMObjectAllocEventCollector oam;
2100 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2101 bounds_check(cp, index, CHECK_0);
2102 constantTag tag = cp->tag_at(index);
2103 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2104 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2105 }
2106 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2107 }
2108 JVM_END
2109
2110 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2111 {
2112 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2113 JvmtiVMObjectAllocEventCollector oam;
2114 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2115 bounds_check(cp, index, CHECK_NULL);
2116 constantTag tag = cp->tag_at(index);
2117 if (!tag.is_name_and_type()) {
2118 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2119 }
2120 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2121 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2122 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2123 objArrayHandle dest(THREAD, dest_o);
2124 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2125 dest->obj_at_put(0, str());
2126 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2127 dest->obj_at_put(1, str());
2128 return (jobjectArray) JNIHandles::make_local(dest());
2129 }
2130 JVM_END
2131
2132 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2133 {
2134 JVMWrapper("JVM_ConstantPoolGetIntAt");
2135 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2136 bounds_check(cp, index, CHECK_0);
2137 constantTag tag = cp->tag_at(index);
2138 if (!tag.is_int()) {
2139 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2140 }
2141 return cp->int_at(index);
2142 }
2143 JVM_END
2144
2145 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2146 {
2147 JVMWrapper("JVM_ConstantPoolGetLongAt");
2148 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2149 bounds_check(cp, index, CHECK_(0L));
2150 constantTag tag = cp->tag_at(index);
2151 if (!tag.is_long()) {
2152 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2153 }
2154 return cp->long_at(index);
2155 }
2156 JVM_END
2157
2158 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2159 {
2160 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2161 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2162 bounds_check(cp, index, CHECK_(0.0f));
2163 constantTag tag = cp->tag_at(index);
2164 if (!tag.is_float()) {
2165 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2166 }
2167 return cp->float_at(index);
2168 }
2169 JVM_END
2170
2171 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2172 {
2173 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2174 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2175 bounds_check(cp, index, CHECK_(0.0));
2176 constantTag tag = cp->tag_at(index);
2177 if (!tag.is_double()) {
2178 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2179 }
2180 return cp->double_at(index);
2181 }
2182 JVM_END
2183
2184 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2185 {
2186 JVMWrapper("JVM_ConstantPoolGetStringAt");
2187 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2188 bounds_check(cp, index, CHECK_NULL);
2189 constantTag tag = cp->tag_at(index);
2190 if (!tag.is_string()) {
2191 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2192 }
2193 oop str = cp->string_at(index, CHECK_NULL);
2194 return (jstring) JNIHandles::make_local(str);
2195 }
2196 JVM_END
2197
2198 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2199 {
2200 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2201 JvmtiVMObjectAllocEventCollector oam;
2202 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2203 bounds_check(cp, index, CHECK_NULL);
2204 constantTag tag = cp->tag_at(index);
2205 if (!tag.is_symbol()) {
2206 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2207 }
2208 Symbol* sym = cp->symbol_at(index);
2209 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2210 return (jstring) JNIHandles::make_local(str());
2211 }
2212 JVM_END
2213
2214 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2215 {
2216 JVMWrapper("JVM_ConstantPoolGetTagAt");
2217 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2218 bounds_check(cp, index, CHECK_0);
2219 constantTag tag = cp->tag_at(index);
2220 jbyte result = tag.value();
2221 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2222 // they are changed to the corresponding tags from the JVM spec, so that java code in
2223 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2224 if (tag.is_klass_or_reference()) {
2225 result = JVM_CONSTANT_Class;
2226 } else if (tag.is_string_index()) {
2227 result = JVM_CONSTANT_String;
2228 } else if (tag.is_method_type_in_error()) {
2229 result = JVM_CONSTANT_MethodType;
2230 } else if (tag.is_method_handle_in_error()) {
2231 result = JVM_CONSTANT_MethodHandle;
2232 } else if (tag.is_dynamic_constant_in_error()) {
2233 result = JVM_CONSTANT_Dynamic;
2234 }
2235 return result;
2236 }
2237 JVM_END
2238
2239 // Assertion support. //////////////////////////////////////////////////////////
2240
2241 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2242 JVMWrapper("JVM_DesiredAssertionStatus");
2243 assert(cls != NULL, "bad class");
2244
2245 oop r = JNIHandles::resolve(cls);
2246 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2247 if (java_lang_Class::is_primitive(r)) return false;
2248
2249 Klass* k = java_lang_Class::as_Klass(r);
2250 assert(k->is_instance_klass(), "must be an instance klass");
2251 if (!k->is_instance_klass()) return false;
2252
2253 ResourceMark rm(THREAD);
2254 const char* name = k->name()->as_C_string();
2255 bool system_class = k->class_loader() == NULL;
2256 return JavaAssertions::enabled(name, system_class);
2257
2258 JVM_END
2259
2260
2261 // Return a new AssertionStatusDirectives object with the fields filled in with
2262 // command-line assertion arguments (i.e., -ea, -da).
2263 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2264 JVMWrapper("JVM_AssertionStatusDirectives");
2265 JvmtiVMObjectAllocEventCollector oam;
2266 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2267 return JNIHandles::make_local(env, asd);
2268 JVM_END
2269
2270 // Arrays support /////////////////////////////////////////////////////////////
2271
2272 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2273 JVMWrapper("JVM_ArrayIsAccessAtomic");
2274 oop o = JNIHandles::resolve(array);
2275 Klass* k = o->klass();
2276 if ((o == NULL) || (!k->is_array_klass())) {
2277 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2278 }
2279 if (k->is_valueArray_klass()) {
2280 return ValueArrayKlass::cast(k)->is_atomic();
2281 }
2282 return true;
2283 JVM_END
2284
2285 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2286 JVMWrapper("JVM_ArrayEnsureAccessAtomic");
2287 oop o = JNIHandles::resolve(array);
2288 Klass* k = o->klass();
2289 if ((o == NULL) || (!k->is_array_klass())) {
2290 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2291 }
2292 if (k->is_valueArray_klass()) {
2293 ValueArrayKlass* vk = ValueArrayKlass::cast(k);
2294 if (!vk->is_atomic()) {
2295 /**
2296 * Need to decide how to implement:
2297 *
2298 * 1) Change to objArrayOop layout, therefore oop->klass() differs so
2299 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through
2300 * "checkcast" & "instanceof"
2301 *
2302 * 2) Use extra header in the valueArrayOop to flag atomicity required and
2303 * possibly per instance lock structure. Said info, could be placed in
2304 * "trailer" rather than disturb the current arrayOop
2305 */
2306 Unimplemented();
2307 }
2308 }
2309 return array;
2310 JVM_END
2311
2312 // Verification ////////////////////////////////////////////////////////////////////////////////
2313
2314 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2315
2316 // RedefineClasses support: bug 6214132 caused verification to fail.
2317 // All functions from this section should call the jvmtiThreadSate function:
2318 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2319 // The function returns a Klass* of the _scratch_class if the verifier
2320 // was invoked in the middle of the class redefinition.
2321 // Otherwise it returns its argument value which is the _the_class Klass*.
2322 // Please, refer to the description in the jvmtiThreadSate.hpp.
2323
2324 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2325 JVMWrapper("JVM_GetClassNameUTF");
2326 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2327 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2328 return k->name()->as_utf8();
2329 JVM_END
2330
2331
2332 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2333 JVMWrapper("JVM_GetClassCPTypes");
2334 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2335 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2336 // types will have length zero if this is not an InstanceKlass
2337 // (length is determined by call to JVM_GetClassCPEntriesCount)
2338 if (k->is_instance_klass()) {
2339 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2340 for (int index = cp->length() - 1; index >= 0; index--) {
2341 constantTag tag = cp->tag_at(index);
2342 types[index] = tag.is_unresolved_klass() ? JVM_CONSTANT_Class : tag.value();
2343 }
2344 }
2345 JVM_END
2346
2347
2348 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2349 JVMWrapper("JVM_GetClassCPEntriesCount");
2350 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2351 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2352 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2353 JVM_END
2354
2355
2356 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2357 JVMWrapper("JVM_GetClassFieldsCount");
2358 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2359 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2360 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2361 JVM_END
2362
2363
2364 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2365 JVMWrapper("JVM_GetClassMethodsCount");
2366 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2367 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2368 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2369 JVM_END
2370
2371
2372 // The following methods, used for the verifier, are never called with
2373 // array klasses, so a direct cast to InstanceKlass is safe.
2374 // Typically, these methods are called in a loop with bounds determined
2375 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2376 // zero for arrays.
2377 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2378 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2379 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2380 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2381 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2382 int length = method->checked_exceptions_length();
2383 if (length > 0) {
2384 CheckedExceptionElement* table= method->checked_exceptions_start();
2385 for (int i = 0; i < length; i++) {
2386 exceptions[i] = table[i].class_cp_index;
2387 }
2388 }
2389 JVM_END
2390
2391
2392 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2393 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2394 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2395 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2396 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2397 return method->checked_exceptions_length();
2398 JVM_END
2399
2400
2401 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2402 JVMWrapper("JVM_GetMethodIxByteCode");
2403 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2404 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2405 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2406 memcpy(code, method->code_base(), method->code_size());
2407 JVM_END
2408
2409
2410 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2411 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2412 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2413 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2414 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2415 return method->code_size();
2416 JVM_END
2417
2418
2419 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2420 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2421 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2422 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2423 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2424 ExceptionTable extable(method);
2425 entry->start_pc = extable.start_pc(entry_index);
2426 entry->end_pc = extable.end_pc(entry_index);
2427 entry->handler_pc = extable.handler_pc(entry_index);
2428 entry->catchType = extable.catch_type_index(entry_index);
2429 JVM_END
2430
2431
2432 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2433 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2434 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2435 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2436 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2437 return method->exception_table_length();
2438 JVM_END
2439
2440
2441 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2442 JVMWrapper("JVM_GetMethodIxModifiers");
2443 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2444 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2445 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2446 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2447 JVM_END
2448
2449
2450 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2451 JVMWrapper("JVM_GetFieldIxModifiers");
2452 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2453 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2454 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2455 JVM_END
2456
2457
2458 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2459 JVMWrapper("JVM_GetMethodIxLocalsCount");
2460 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2461 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2462 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2463 return method->max_locals();
2464 JVM_END
2465
2466
2467 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2468 JVMWrapper("JVM_GetMethodIxArgsSize");
2469 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2470 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2471 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2472 return method->size_of_parameters();
2473 JVM_END
2474
2475
2476 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2477 JVMWrapper("JVM_GetMethodIxMaxStack");
2478 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2479 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2480 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2481 return method->verifier_max_stack();
2482 JVM_END
2483
2484
2485 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2486 JVMWrapper("JVM_IsConstructorIx");
2487 ResourceMark rm(THREAD);
2488 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2489 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2490 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2491 return method->name() == vmSymbols::object_initializer_name();
2492 JVM_END
2493
2494
2495 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2496 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2497 ResourceMark rm(THREAD);
2498 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2499 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2500 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2501 return method->is_overpass();
2502 JVM_END
2503
2504 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2505 JVMWrapper("JVM_GetMethodIxIxUTF");
2506 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2507 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2508 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2509 return method->name()->as_utf8();
2510 JVM_END
2511
2512
2513 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2514 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2515 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2516 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2517 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2518 return method->signature()->as_utf8();
2519 JVM_END
2520
2521 /**
2522 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2523 * read entries in the constant pool. Since the old verifier always
2524 * works on a copy of the code, it will not see any rewriting that
2525 * may possibly occur in the middle of verification. So it is important
2526 * that nothing it calls tries to use the cpCache instead of the raw
2527 * constant pool, so we must use cp->uncached_x methods when appropriate.
2528 */
2529 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2530 JVMWrapper("JVM_GetCPFieldNameUTF");
2531 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2532 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2533 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2534 switch (cp->tag_at(cp_index).value()) {
2535 case JVM_CONSTANT_Fieldref:
2536 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2537 default:
2538 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2539 }
2540 ShouldNotReachHere();
2541 return NULL;
2542 JVM_END
2543
2544
2545 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2546 JVMWrapper("JVM_GetCPMethodNameUTF");
2547 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2548 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2549 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2550 switch (cp->tag_at(cp_index).value()) {
2551 case JVM_CONSTANT_InterfaceMethodref:
2552 case JVM_CONSTANT_Methodref:
2553 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2554 default:
2555 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2556 }
2557 ShouldNotReachHere();
2558 return NULL;
2559 JVM_END
2560
2561
2562 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2563 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2564 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2565 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2566 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2567 switch (cp->tag_at(cp_index).value()) {
2568 case JVM_CONSTANT_InterfaceMethodref:
2569 case JVM_CONSTANT_Methodref:
2570 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2571 default:
2572 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2573 }
2574 ShouldNotReachHere();
2575 return NULL;
2576 JVM_END
2577
2578
2579 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2580 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2581 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2582 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2583 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2584 switch (cp->tag_at(cp_index).value()) {
2585 case JVM_CONSTANT_Fieldref:
2586 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2587 default:
2588 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2589 }
2590 ShouldNotReachHere();
2591 return NULL;
2592 JVM_END
2593
2594
2595 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2596 JVMWrapper("JVM_GetCPClassNameUTF");
2597 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2598 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2599 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2600 Symbol* classname = cp->klass_name_at(cp_index);
2601 return classname->as_utf8();
2602 JVM_END
2603
2604
2605 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2606 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2607 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2608 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2609 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2610 switch (cp->tag_at(cp_index).value()) {
2611 case JVM_CONSTANT_Fieldref: {
2612 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2613 Symbol* classname = cp->klass_name_at(class_index);
2614 return classname->as_utf8();
2615 }
2616 default:
2617 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2618 }
2619 ShouldNotReachHere();
2620 return NULL;
2621 JVM_END
2622
2623
2624 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2625 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2626 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2627 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2628 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2629 switch (cp->tag_at(cp_index).value()) {
2630 case JVM_CONSTANT_Methodref:
2631 case JVM_CONSTANT_InterfaceMethodref: {
2632 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2633 Symbol* classname = cp->klass_name_at(class_index);
2634 return classname->as_utf8();
2635 }
2636 default:
2637 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2638 }
2639 ShouldNotReachHere();
2640 return NULL;
2641 JVM_END
2642
2643
2644 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2645 JVMWrapper("JVM_GetCPFieldModifiers");
2646 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2647 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2648 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2649 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2650 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2651 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2652 switch (cp->tag_at(cp_index).value()) {
2653 case JVM_CONSTANT_Fieldref: {
2654 Symbol* name = cp->uncached_name_ref_at(cp_index);
2655 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2656 InstanceKlass* ik = InstanceKlass::cast(k_called);
2657 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2658 if (fs.name() == name && fs.signature() == signature) {
2659 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2660 }
2661 }
2662 return -1;
2663 }
2664 default:
2665 fatal("JVM_GetCPFieldModifiers: illegal constant");
2666 }
2667 ShouldNotReachHere();
2668 return 0;
2669 JVM_END
2670
2671
2672 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2673 JVMWrapper("JVM_GetCPMethodModifiers");
2674 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2675 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2676 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2677 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2678 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2679 switch (cp->tag_at(cp_index).value()) {
2680 case JVM_CONSTANT_Methodref:
2681 case JVM_CONSTANT_InterfaceMethodref: {
2682 Symbol* name = cp->uncached_name_ref_at(cp_index);
2683 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2684 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2685 int methods_count = methods->length();
2686 for (int i = 0; i < methods_count; i++) {
2687 Method* method = methods->at(i);
2688 if (method->name() == name && method->signature() == signature) {
2689 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2690 }
2691 }
2692 return -1;
2693 }
2694 default:
2695 fatal("JVM_GetCPMethodModifiers: illegal constant");
2696 }
2697 ShouldNotReachHere();
2698 return 0;
2699 JVM_END
2700
2701
2702 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2703
2704 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2705 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2706 JVM_END
2707
2708
2709 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2710 JVMWrapper("JVM_IsSameClassPackage");
2711 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2712 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2713 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2714 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2715 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2716 JVM_END
2717
2718 // Printing support //////////////////////////////////////////////////
2719 extern "C" {
2720
2721 ATTRIBUTE_PRINTF(3, 0)
2722 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2723 // Reject count values that are negative signed values converted to
2724 // unsigned; see bug 4399518, 4417214
2725 if ((intptr_t)count <= 0) return -1;
2726
2727 int result = os::vsnprintf(str, count, fmt, args);
2728 if (result > 0 && (size_t)result >= count) {
2729 result = -1;
2730 }
2731
2732 return result;
2733 }
2734
2735 ATTRIBUTE_PRINTF(3, 4)
2736 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2737 va_list args;
2738 int len;
2739 va_start(args, fmt);
2740 len = jio_vsnprintf(str, count, fmt, args);
2741 va_end(args);
2742 return len;
2743 }
2744
2745 ATTRIBUTE_PRINTF(2, 3)
2746 int jio_fprintf(FILE* f, const char *fmt, ...) {
2747 int len;
2748 va_list args;
2749 va_start(args, fmt);
2750 len = jio_vfprintf(f, fmt, args);
2751 va_end(args);
2752 return len;
2753 }
2754
2755 ATTRIBUTE_PRINTF(2, 0)
2756 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2757 if (Arguments::vfprintf_hook() != NULL) {
2758 return Arguments::vfprintf_hook()(f, fmt, args);
2759 } else {
2760 return vfprintf(f, fmt, args);
2761 }
2762 }
2763
2764 ATTRIBUTE_PRINTF(1, 2)
2765 JNIEXPORT int jio_printf(const char *fmt, ...) {
2766 int len;
2767 va_list args;
2768 va_start(args, fmt);
2769 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2770 va_end(args);
2771 return len;
2772 }
2773
2774 // HotSpot specific jio method
2775 void jio_print(const char* s, size_t len) {
2776 // Try to make this function as atomic as possible.
2777 if (Arguments::vfprintf_hook() != NULL) {
2778 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2779 } else {
2780 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2781 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2782 }
2783 }
2784
2785 } // Extern C
2786
2787 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2788
2789 // In most of the JVM thread support functions we need to access the
2790 // thread through a ThreadsListHandle to prevent it from exiting and
2791 // being reclaimed while we try to operate on it. The exceptions to this
2792 // rule are when operating on the current thread, or if the monitor of
2793 // the target java.lang.Thread is locked at the Java level - in both
2794 // cases the target cannot exit.
2795
2796 static void thread_entry(JavaThread* thread, TRAPS) {
2797 HandleMark hm(THREAD);
2798 Handle obj(THREAD, thread->threadObj());
2799 JavaValue result(T_VOID);
2800 JavaCalls::call_virtual(&result,
2801 obj,
2802 SystemDictionary::Thread_klass(),
2803 vmSymbols::run_method_name(),
2804 vmSymbols::void_method_signature(),
2805 THREAD);
2806 }
2807
2808
2809 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2810 JVMWrapper("JVM_StartThread");
2811 JavaThread *native_thread = NULL;
2812
2813 // We cannot hold the Threads_lock when we throw an exception,
2814 // due to rank ordering issues. Example: we might need to grab the
2815 // Heap_lock while we construct the exception.
2816 bool throw_illegal_thread_state = false;
2817
2818 // We must release the Threads_lock before we can post a jvmti event
2819 // in Thread::start.
2820 {
2821 // Ensure that the C++ Thread and OSThread structures aren't freed before
2822 // we operate.
2823 MutexLocker mu(Threads_lock);
2824
2825 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2826 // re-starting an already started thread, so we should usually find
2827 // that the JavaThread is null. However for a JNI attached thread
2828 // there is a small window between the Thread object being created
2829 // (with its JavaThread set) and the update to its threadStatus, so we
2830 // have to check for this
2831 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2832 throw_illegal_thread_state = true;
2833 } else {
2834 // We could also check the stillborn flag to see if this thread was already stopped, but
2835 // for historical reasons we let the thread detect that itself when it starts running
2836
2837 jlong size =
2838 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2839 // Allocate the C++ Thread structure and create the native thread. The
2840 // stack size retrieved from java is 64-bit signed, but the constructor takes
2841 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2842 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2843 // - Avoid passing negative values which would result in really large stacks.
2844 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2845 size_t sz = size > 0 ? (size_t) size : 0;
2846 native_thread = new JavaThread(&thread_entry, sz);
2847
2848 // At this point it may be possible that no osthread was created for the
2849 // JavaThread due to lack of memory. Check for this situation and throw
2850 // an exception if necessary. Eventually we may want to change this so
2851 // that we only grab the lock if the thread was created successfully -
2852 // then we can also do this check and throw the exception in the
2853 // JavaThread constructor.
2854 if (native_thread->osthread() != NULL) {
2855 // Note: the current thread is not being used within "prepare".
2856 native_thread->prepare(jthread);
2857 }
2858 }
2859 }
2860
2861 if (throw_illegal_thread_state) {
2862 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2863 }
2864
2865 assert(native_thread != NULL, "Starting null thread?");
2866
2867 if (native_thread->osthread() == NULL) {
2868 // No one should hold a reference to the 'native_thread'.
2869 native_thread->smr_delete();
2870 if (JvmtiExport::should_post_resource_exhausted()) {
2871 JvmtiExport::post_resource_exhausted(
2872 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2873 os::native_thread_creation_failed_msg());
2874 }
2875 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2876 os::native_thread_creation_failed_msg());
2877 }
2878
2879 Thread::start(native_thread);
2880
2881 JVM_END
2882
2883
2884 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2885 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2886 // but is thought to be reliable and simple. In the case, where the receiver is the
2887 // same thread as the sender, no VM_Operation is needed.
2888 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2889 JVMWrapper("JVM_StopThread");
2890
2891 // A nested ThreadsListHandle will grab the Threads_lock so create
2892 // tlh before we resolve throwable.
2893 ThreadsListHandle tlh(thread);
2894 oop java_throwable = JNIHandles::resolve(throwable);
2895 if (java_throwable == NULL) {
2896 THROW(vmSymbols::java_lang_NullPointerException());
2897 }
2898 oop java_thread = NULL;
2899 JavaThread* receiver = NULL;
2900 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2901 Events::log_exception(thread,
2902 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2903 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2904
2905 if (is_alive) {
2906 // jthread refers to a live JavaThread.
2907 if (thread == receiver) {
2908 // Exception is getting thrown at self so no VM_Operation needed.
2909 THROW_OOP(java_throwable);
2910 } else {
2911 // Use a VM_Operation to throw the exception.
2912 Thread::send_async_exception(java_thread, java_throwable);
2913 }
2914 } else {
2915 // Either:
2916 // - target thread has not been started before being stopped, or
2917 // - target thread already terminated
2918 // We could read the threadStatus to determine which case it is
2919 // but that is overkill as it doesn't matter. We must set the
2920 // stillborn flag for the first case, and if the thread has already
2921 // exited setting this flag has no effect.
2922 java_lang_Thread::set_stillborn(java_thread);
2923 }
2924 JVM_END
2925
2926
2927 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2928 JVMWrapper("JVM_IsThreadAlive");
2929
2930 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2931 return java_lang_Thread::is_alive(thread_oop);
2932 JVM_END
2933
2934
2935 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2936 JVMWrapper("JVM_SuspendThread");
2937
2938 ThreadsListHandle tlh(thread);
2939 JavaThread* receiver = NULL;
2940 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2941 if (is_alive) {
2942 // jthread refers to a live JavaThread.
2943 {
2944 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2945 if (receiver->is_external_suspend()) {
2946 // Don't allow nested external suspend requests. We can't return
2947 // an error from this interface so just ignore the problem.
2948 return;
2949 }
2950 if (receiver->is_exiting()) { // thread is in the process of exiting
2951 return;
2952 }
2953 receiver->set_external_suspend();
2954 }
2955
2956 // java_suspend() will catch threads in the process of exiting
2957 // and will ignore them.
2958 receiver->java_suspend();
2959
2960 // It would be nice to have the following assertion in all the
2961 // time, but it is possible for a racing resume request to have
2962 // resumed this thread right after we suspended it. Temporarily
2963 // enable this assertion if you are chasing a different kind of
2964 // bug.
2965 //
2966 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2967 // receiver->is_being_ext_suspended(), "thread is not suspended");
2968 }
2969 JVM_END
2970
2971
2972 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2973 JVMWrapper("JVM_ResumeThread");
2974
2975 ThreadsListHandle tlh(thread);
2976 JavaThread* receiver = NULL;
2977 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2978 if (is_alive) {
2979 // jthread refers to a live JavaThread.
2980
2981 // This is the original comment for this Threads_lock grab:
2982 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2983 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2984 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2985 // looks at it.
2986 //
2987 // The above comment dates back to when we had both internal and
2988 // external suspend APIs that shared a common underlying mechanism.
2989 // External suspend is now entirely cooperative and doesn't share
2990 // anything with internal suspend. That said, there are some
2991 // assumptions in the VM that an external resume grabs the
2992 // Threads_lock. We can't drop the Threads_lock grab here until we
2993 // resolve the assumptions that exist elsewhere.
2994 //
2995 MutexLocker ml(Threads_lock);
2996 receiver->java_resume();
2997 }
2998 JVM_END
2999
3000
3001 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3002 JVMWrapper("JVM_SetThreadPriority");
3003
3004 ThreadsListHandle tlh(thread);
3005 oop java_thread = NULL;
3006 JavaThread* receiver = NULL;
3007 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3008 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3009
3010 if (is_alive) {
3011 // jthread refers to a live JavaThread.
3012 Thread::set_priority(receiver, (ThreadPriority)prio);
3013 }
3014 // Implied else: If the JavaThread hasn't started yet, then the
3015 // priority set in the java.lang.Thread object above will be pushed
3016 // down when it does start.
3017 JVM_END
3018
3019
3020 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3021 JVMWrapper("JVM_Yield");
3022 if (os::dont_yield()) return;
3023 HOTSPOT_THREAD_YIELD();
3024 os::naked_yield();
3025 JVM_END
3026
3027 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3028 assert(event != NULL, "invariant");
3029 assert(event->should_commit(), "invariant");
3030 event->set_time(millis);
3031 event->commit();
3032 }
3033
3034 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3035 JVMWrapper("JVM_Sleep");
3036
3037 if (millis < 0) {
3038 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3039 }
3040
3041 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3042 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3043 }
3044
3045 // Save current thread state and restore it at the end of this block.
3046 // And set new thread state to SLEEPING.
3047 JavaThreadSleepState jtss(thread);
3048
3049 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3050 EventThreadSleep event;
3051
3052 if (millis == 0) {
3053 os::naked_yield();
3054 } else {
3055 ThreadState old_state = thread->osthread()->get_state();
3056 thread->osthread()->set_state(SLEEPING);
3057 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3058 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3059 // us while we were sleeping. We do not overwrite those.
3060 if (!HAS_PENDING_EXCEPTION) {
3061 if (event.should_commit()) {
3062 post_thread_sleep_event(&event, millis);
3063 }
3064 HOTSPOT_THREAD_SLEEP_END(1);
3065
3066 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3067 // to properly restore the thread state. That's likely wrong.
3068 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3069 }
3070 }
3071 thread->osthread()->set_state(old_state);
3072 }
3073 if (event.should_commit()) {
3074 post_thread_sleep_event(&event, millis);
3075 }
3076 HOTSPOT_THREAD_SLEEP_END(0);
3077 JVM_END
3078
3079 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3080 JVMWrapper("JVM_CurrentThread");
3081 oop jthread = thread->threadObj();
3082 assert (thread != NULL, "no current thread!");
3083 return JNIHandles::make_local(env, jthread);
3084 JVM_END
3085
3086
3087 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3088 JVMWrapper("JVM_CountStackFrames");
3089
3090 uint32_t debug_bits = 0;
3091 ThreadsListHandle tlh(thread);
3092 JavaThread* receiver = NULL;
3093 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3094 int count = 0;
3095 if (is_alive) {
3096 // jthread refers to a live JavaThread.
3097 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
3098 // Count all java activation, i.e., number of vframes.
3099 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) {
3100 // Native frames are not counted.
3101 if (!vfst.method()->is_native()) count++;
3102 }
3103 } else {
3104 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3105 "this thread is not suspended");
3106 }
3107 }
3108 // Implied else: if JavaThread is not alive simply return a count of 0.
3109
3110 return count;
3111 JVM_END
3112
3113
3114 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3115 JVMWrapper("JVM_Interrupt");
3116
3117 ThreadsListHandle tlh(thread);
3118 JavaThread* receiver = NULL;
3119 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3120 if (is_alive) {
3121 // jthread refers to a live JavaThread.
3122 Thread::interrupt(receiver);
3123 }
3124 JVM_END
3125
3126
3127 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3128 JVMWrapper("JVM_IsInterrupted");
3129
3130 ThreadsListHandle tlh(thread);
3131 JavaThread* receiver = NULL;
3132 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3133 if (is_alive) {
3134 // jthread refers to a live JavaThread.
3135 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3136 } else {
3137 return JNI_FALSE;
3138 }
3139 JVM_END
3140
3141
3142 // Return true iff the current thread has locked the object passed in
3143
3144 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3145 JVMWrapper("JVM_HoldsLock");
3146 assert(THREAD->is_Java_thread(), "sanity check");
3147 if (obj == NULL) {
3148 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3149 }
3150 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3151 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3152 JVM_END
3153
3154
3155 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3156 JVMWrapper("JVM_DumpAllStacks");
3157 VM_PrintThreads op;
3158 VMThread::execute(&op);
3159 if (JvmtiExport::should_post_data_dump()) {
3160 JvmtiExport::post_data_dump();
3161 }
3162 JVM_END
3163
3164 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3165 JVMWrapper("JVM_SetNativeThreadName");
3166
3167 // We don't use a ThreadsListHandle here because the current thread
3168 // must be alive.
3169 oop java_thread = JNIHandles::resolve_non_null(jthread);
3170 JavaThread* thr = java_lang_Thread::thread(java_thread);
3171 if (thread == thr && !thr->has_attached_via_jni()) {
3172 // Thread naming is only supported for the current thread and
3173 // we don't set the name of an attached thread to avoid stepping
3174 // on other programs.
3175 ResourceMark rm(thread);
3176 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3177 os::set_native_thread_name(thread_name);
3178 }
3179 JVM_END
3180
3181 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3182
3183 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3184 JVMWrapper("JVM_GetClassContext");
3185 ResourceMark rm(THREAD);
3186 JvmtiVMObjectAllocEventCollector oam;
3187 vframeStream vfst(thread);
3188
3189 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3190 // This must only be called from SecurityManager.getClassContext
3191 Method* m = vfst.method();
3192 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3193 m->name() == vmSymbols::getClassContext_name() &&
3194 m->signature() == vmSymbols::void_class_array_signature())) {
3195 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3196 }
3197 }
3198
3199 // Collect method holders
3200 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3201 for (; !vfst.at_end(); vfst.security_next()) {
3202 Method* m = vfst.method();
3203 // Native frames are not returned
3204 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3205 Klass* holder = m->method_holder();
3206 assert(holder->is_klass(), "just checking");
3207 klass_array->append(holder);
3208 }
3209 }
3210
3211 // Create result array of type [Ljava/lang/Class;
3212 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3213 // Fill in mirrors corresponding to method holders
3214 for (int i = 0; i < klass_array->length(); i++) {
3215 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3216 }
3217
3218 return (jobjectArray) JNIHandles::make_local(env, result);
3219 JVM_END
3220
3221
3222 // java.lang.Package ////////////////////////////////////////////////////////////////
3223
3224
3225 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3226 JVMWrapper("JVM_GetSystemPackage");
3227 ResourceMark rm(THREAD);
3228 JvmtiVMObjectAllocEventCollector oam;
3229 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3230 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3231 return (jstring) JNIHandles::make_local(result);
3232 JVM_END
3233
3234
3235 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3236 JVMWrapper("JVM_GetSystemPackages");
3237 JvmtiVMObjectAllocEventCollector oam;
3238 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3239 return (jobjectArray) JNIHandles::make_local(result);
3240 JVM_END
3241
3242
3243 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3244
3245
3246 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3247 JVMWrapper("JVM_GetAndClearReferencePendingList");
3248
3249 MonitorLockerEx ml(Heap_lock);
3250 oop ref = Universe::reference_pending_list();
3251 if (ref != NULL) {
3252 Universe::set_reference_pending_list(NULL);
3253 }
3254 return JNIHandles::make_local(env, ref);
3255 JVM_END
3256
3257 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3258 JVMWrapper("JVM_HasReferencePendingList");
3259 MonitorLockerEx ml(Heap_lock);
3260 return Universe::has_reference_pending_list();
3261 JVM_END
3262
3263 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3264 JVMWrapper("JVM_WaitForReferencePendingList");
3265 MonitorLockerEx ml(Heap_lock);
3266 while (!Universe::has_reference_pending_list()) {
3267 ml.wait();
3268 }
3269 JVM_END
3270
3271
3272 // ObjectInputStream ///////////////////////////////////////////////////////////////
3273
3274 // Return the first user-defined class loader up the execution stack, or null
3275 // if only code from the bootstrap or platform class loader is on the stack.
3276
3277 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3278 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3279 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3280 oop loader = vfst.method()->method_holder()->class_loader();
3281 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3282 return JNIHandles::make_local(env, loader);
3283 }
3284 }
3285 return NULL;
3286 JVM_END
3287
3288
3289 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3290
3291
3292 // resolve array handle and check arguments
3293 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3294 if (arr == NULL) {
3295 THROW_0(vmSymbols::java_lang_NullPointerException());
3296 }
3297 oop a = JNIHandles::resolve_non_null(arr);
3298 if (!a->is_array()) {
3299 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3300 } else if (type_array_only && !a->is_typeArray()) {
3301 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3302 }
3303 return arrayOop(a);
3304 }
3305
3306
3307 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3308 JVMWrapper("JVM_GetArrayLength");
3309 arrayOop a = check_array(env, arr, false, CHECK_0);
3310 return a->length();
3311 JVM_END
3312
3313
3314 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3315 JVMWrapper("JVM_Array_Get");
3316 JvmtiVMObjectAllocEventCollector oam;
3317 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3318 jvalue value;
3319 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3320 oop box = Reflection::box(&value, type, CHECK_NULL);
3321 return JNIHandles::make_local(env, box);
3322 JVM_END
3323
3324
3325 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3326 JVMWrapper("JVM_GetPrimitiveArrayElement");
3327 jvalue value;
3328 value.i = 0; // to initialize value before getting used in CHECK
3329 arrayOop a = check_array(env, arr, true, CHECK_(value));
3330 assert(a->is_typeArray(), "just checking");
3331 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3332 BasicType wide_type = (BasicType) wCode;
3333 if (type != wide_type) {
3334 Reflection::widen(&value, type, wide_type, CHECK_(value));
3335 }
3336 return value;
3337 JVM_END
3338
3339
3340 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3341 JVMWrapper("JVM_SetArrayElement");
3342 arrayOop a = check_array(env, arr, false, CHECK);
3343 oop box = JNIHandles::resolve(val);
3344 jvalue value;
3345 value.i = 0; // to initialize value before getting used in CHECK
3346 BasicType value_type;
3347 if (a->is_objArray()) {
3348 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3349 value_type = Reflection::unbox_for_regular_object(box, &value);
3350 } else {
3351 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3352 }
3353 Reflection::array_set(&value, a, index, value_type, CHECK);
3354 JVM_END
3355
3356
3357 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3358 JVMWrapper("JVM_SetPrimitiveArrayElement");
3359 arrayOop a = check_array(env, arr, true, CHECK);
3360 assert(a->is_typeArray(), "just checking");
3361 BasicType value_type = (BasicType) vCode;
3362 Reflection::array_set(&v, a, index, value_type, CHECK);
3363 JVM_END
3364
3365
3366 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3367 JVMWrapper("JVM_NewArray");
3368 JvmtiVMObjectAllocEventCollector oam;
3369 oop element_mirror = JNIHandles::resolve(eltClass);
3370 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3371 return JNIHandles::make_local(env, result);
3372 JVM_END
3373
3374
3375 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3376 JVMWrapper("JVM_NewMultiArray");
3377 JvmtiVMObjectAllocEventCollector oam;
3378 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3379 oop element_mirror = JNIHandles::resolve(eltClass);
3380 assert(dim_array->is_typeArray(), "just checking");
3381 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3382 return JNIHandles::make_local(env, result);
3383 JVM_END
3384
3385
3386 // Library support ///////////////////////////////////////////////////////////////////////////
3387
3388 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3389 //%note jvm_ct
3390 JVMWrapper("JVM_LoadLibrary");
3391 char ebuf[1024];
3392 void *load_result;
3393 {
3394 ThreadToNativeFromVM ttnfvm(thread);
3395 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3396 }
3397 if (load_result == NULL) {
3398 char msg[1024];
3399 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3400 // Since 'ebuf' may contain a string encoded using
3401 // platform encoding scheme, we need to pass
3402 // Exceptions::unsafe_to_utf8 to the new_exception method
3403 // as the last argument. See bug 6367357.
3404 Handle h_exception =
3405 Exceptions::new_exception(thread,
3406 vmSymbols::java_lang_UnsatisfiedLinkError(),
3407 msg, Exceptions::unsafe_to_utf8);
3408
3409 THROW_HANDLE_0(h_exception);
3410 }
3411 return load_result;
3412 JVM_END
3413
3414
3415 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3416 JVMWrapper("JVM_UnloadLibrary");
3417 os::dll_unload(handle);
3418 JVM_END
3419
3420
3421 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3422 JVMWrapper("JVM_FindLibraryEntry");
3423 return os::dll_lookup(handle, name);
3424 JVM_END
3425
3426
3427 // JNI version ///////////////////////////////////////////////////////////////////////////////
3428
3429 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3430 JVMWrapper("JVM_IsSupportedJNIVersion");
3431 return Threads::is_supported_jni_version_including_1_1(version);
3432 JVM_END
3433
3434
3435 // String support ///////////////////////////////////////////////////////////////////////////
3436
3437 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3438 JVMWrapper("JVM_InternString");
3439 JvmtiVMObjectAllocEventCollector oam;
3440 if (str == NULL) return NULL;
3441 oop string = JNIHandles::resolve_non_null(str);
3442 oop result = StringTable::intern(string, CHECK_NULL);
3443 return (jstring) JNIHandles::make_local(env, result);
3444 JVM_END
3445
3446
3447 // Raw monitor support //////////////////////////////////////////////////////////////////////
3448
3449 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3450 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3451 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3452 // that only works with java threads.
3453
3454
3455 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3456 VM_Exit::block_if_vm_exited();
3457 JVMWrapper("JVM_RawMonitorCreate");
3458 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3459 }
3460
3461
3462 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3463 VM_Exit::block_if_vm_exited();
3464 JVMWrapper("JVM_RawMonitorDestroy");
3465 delete ((Mutex*) mon);
3466 }
3467
3468
3469 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3470 VM_Exit::block_if_vm_exited();
3471 JVMWrapper("JVM_RawMonitorEnter");
3472 ((Mutex*) mon)->jvm_raw_lock();
3473 return 0;
3474 }
3475
3476
3477 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3478 VM_Exit::block_if_vm_exited();
3479 JVMWrapper("JVM_RawMonitorExit");
3480 ((Mutex*) mon)->jvm_raw_unlock();
3481 }
3482
3483
3484 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3485
3486 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3487 Handle loader, Handle protection_domain,
3488 jboolean throwError, TRAPS) {
3489 // Security Note:
3490 // The Java level wrapper will perform the necessary security check allowing
3491 // us to pass the NULL as the initiating class loader. The VM is responsible for
3492 // the checkPackageAccess relative to the initiating class loader via the
3493 // protection_domain. The protection_domain is passed as NULL by the java code
3494 // if there is no security manager in 3-arg Class.forName().
3495 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3496
3497 // Check if we should initialize the class
3498 if (init && klass->is_instance_klass()) {
3499 klass->initialize(CHECK_NULL);
3500 }
3501 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3502 }
3503
3504
3505 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3506
3507 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3508 JVMWrapper("JVM_InvokeMethod");
3509 Handle method_handle;
3510 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3511 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3512 Handle receiver(THREAD, JNIHandles::resolve(obj));
3513 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3514 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3515 jobject res = JNIHandles::make_local(env, result);
3516 if (JvmtiExport::should_post_vm_object_alloc()) {
3517 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3518 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3519 if (java_lang_Class::is_primitive(ret_type)) {
3520 // Only for primitive type vm allocates memory for java object.
3521 // See box() method.
3522 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3523 }
3524 }
3525 return res;
3526 } else {
3527 THROW_0(vmSymbols::java_lang_StackOverflowError());
3528 }
3529 JVM_END
3530
3531
3532 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3533 JVMWrapper("JVM_NewInstanceFromConstructor");
3534 oop constructor_mirror = JNIHandles::resolve(c);
3535 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3536 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3537 jobject res = JNIHandles::make_local(env, result);
3538 if (JvmtiExport::should_post_vm_object_alloc()) {
3539 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3540 }
3541 return res;
3542 JVM_END
3543
3544 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3545
3546 JVM_LEAF(jboolean, JVM_SupportsCX8())
3547 JVMWrapper("JVM_SupportsCX8");
3548 return VM_Version::supports_cx8();
3549 JVM_END
3550
3551 // Returns an array of all live Thread objects (VM internal JavaThreads,
3552 // jvmti agent threads, and JNI attaching threads are skipped)
3553 // See CR 6404306 regarding JNI attaching threads
3554 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3555 ResourceMark rm(THREAD);
3556 ThreadsListEnumerator tle(THREAD, false, false);
3557 JvmtiVMObjectAllocEventCollector oam;
3558
3559 int num_threads = tle.num_threads();
3560 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3561 objArrayHandle threads_ah(THREAD, r);
3562
3563 for (int i = 0; i < num_threads; i++) {
3564 Handle h = tle.get_threadObj(i);
3565 threads_ah->obj_at_put(i, h());
3566 }
3567
3568 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3569 JVM_END
3570
3571
3572 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3573 // Return StackTraceElement[][], each element is the stack trace of a thread in
3574 // the corresponding entry in the given threads array
3575 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3576 JVMWrapper("JVM_DumpThreads");
3577 JvmtiVMObjectAllocEventCollector oam;
3578
3579 // Check if threads is null
3580 if (threads == NULL) {
3581 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3582 }
3583
3584 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3585 objArrayHandle ah(THREAD, a);
3586 int num_threads = ah->length();
3587 // check if threads is non-empty array
3588 if (num_threads == 0) {
3589 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3590 }
3591
3592 // check if threads is not an array of objects of Thread class
3593 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3594 if (k != SystemDictionary::Thread_klass()) {
3595 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3596 }
3597
3598 ResourceMark rm(THREAD);
3599
3600 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3601 for (int i = 0; i < num_threads; i++) {
3602 oop thread_obj = ah->obj_at(i);
3603 instanceHandle h(THREAD, (instanceOop) thread_obj);
3604 thread_handle_array->append(h);
3605 }
3606
3607 // The JavaThread references in thread_handle_array are validated
3608 // in VM_ThreadDump::doit().
3609 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3610 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3611
3612 JVM_END
3613
3614 // JVM monitoring and management support
3615 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3616 return Management::get_jmm_interface(version);
3617 JVM_END
3618
3619 // com.sun.tools.attach.VirtualMachine agent properties support
3620 //
3621 // Initialize the agent properties with the properties maintained in the VM
3622 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3623 JVMWrapper("JVM_InitAgentProperties");
3624 ResourceMark rm;
3625
3626 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3627
3628 PUTPROP(props, "sun.java.command", Arguments::java_command());
3629 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3630 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3631 return properties;
3632 JVM_END
3633
3634 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3635 {
3636 JVMWrapper("JVM_GetEnclosingMethodInfo");
3637 JvmtiVMObjectAllocEventCollector oam;
3638
3639 if (ofClass == NULL) {
3640 return NULL;
3641 }
3642 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3643 // Special handling for primitive objects
3644 if (java_lang_Class::is_primitive(mirror())) {
3645 return NULL;
3646 }
3647 Klass* k = java_lang_Class::as_Klass(mirror());
3648 if (!k->is_instance_klass()) {
3649 return NULL;
3650 }
3651 InstanceKlass* ik = InstanceKlass::cast(k);
3652 int encl_method_class_idx = ik->enclosing_method_class_index();
3653 if (encl_method_class_idx == 0) {
3654 return NULL;
3655 }
3656 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3657 objArrayHandle dest(THREAD, dest_o);
3658 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3659 dest->obj_at_put(0, enc_k->java_mirror());
3660 int encl_method_method_idx = ik->enclosing_method_method_index();
3661 if (encl_method_method_idx != 0) {
3662 Symbol* sym = ik->constants()->symbol_at(
3663 extract_low_short_from_int(
3664 ik->constants()->name_and_type_at(encl_method_method_idx)));
3665 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3666 dest->obj_at_put(1, str());
3667 sym = ik->constants()->symbol_at(
3668 extract_high_short_from_int(
3669 ik->constants()->name_and_type_at(encl_method_method_idx)));
3670 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3671 dest->obj_at_put(2, str());
3672 }
3673 return (jobjectArray) JNIHandles::make_local(dest());
3674 }
3675 JVM_END
3676
3677 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3678 {
3679 memset(info, 0, info_size);
3680
3681 info->jvm_version = Abstract_VM_Version::jvm_version();
3682 info->patch_version = Abstract_VM_Version::vm_patch_version();
3683
3684 // when we add a new capability in the jvm_version_info struct, we should also
3685 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3686 // counter defined in runtimeService.cpp.
3687 info->is_attach_supported = AttachListener::is_attach_supported();
3688 }
3689 JVM_END
3690
3691 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3692 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3693 ResourceMark rm(THREAD);
3694
3695 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3696 return NULL;
3697 }
3698
3699 char** vm_flags = Arguments::jvm_flags_array();
3700 char** vm_args = Arguments::jvm_args_array();
3701 int num_flags = Arguments::num_jvm_flags();
3702 int num_args = Arguments::num_jvm_args();
3703
3704 InstanceKlass* ik = SystemDictionary::String_klass();
3705 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3706 objArrayHandle result_h(THREAD, r);
3707
3708 int index = 0;
3709 for (int j = 0; j < num_flags; j++, index++) {
3710 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3711 result_h->obj_at_put(index, h());
3712 }
3713 for (int i = 0; i < num_args; i++, index++) {
3714 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3715 result_h->obj_at_put(index, h());
3716 }
3717 return (jobjectArray) JNIHandles::make_local(env, result_h());
3718 JVM_END
3719
3720 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3721 return os::get_signal_number(name);
3722 JVM_END