1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/modules.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/stringTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "gc/shared/collectedHeap.inline.hpp"
39 #include "interpreter/bytecode.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "memory/resourceArea.hpp"
42 #include "memory/universe.inline.hpp"
43 #include "oops/access.inline.hpp"
44 #include "oops/fieldStreams.hpp"
45 #include "oops/instanceKlass.hpp"
46 #include "oops/method.hpp"
47 #include "oops/objArrayKlass.hpp"
48 #include "oops/objArrayOop.inline.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "oops/valueArrayKlass.hpp"
51 #include "prims/jvm_misc.hpp"
52 #include "prims/jvmtiExport.hpp"
53 #include "prims/jvmtiThreadState.hpp"
54 #include "prims/nativeLookup.hpp"
55 #include "prims/privilegedStack.hpp"
56 #include "prims/stackwalk.hpp"
57 #include "runtime/arguments.hpp"
58 #include "runtime/atomic.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/init.hpp"
61 #include "runtime/interfaceSupport.hpp"
62 #include "runtime/java.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/jfieldIDWorkaround.hpp"
65 #include "runtime/jniHandles.inline.hpp"
66 #include "runtime/orderAccess.inline.hpp"
67 #include "runtime/os.inline.hpp"
68 #include "runtime/perfData.hpp"
69 #include "runtime/reflection.hpp"
70 #include "runtime/thread.inline.hpp"
71 #include "runtime/threadSMR.hpp"
72 #include "runtime/vframe.hpp"
73 #include "runtime/vm_operations.hpp"
74 #include "runtime/vm_version.hpp"
75 #include "services/attachListener.hpp"
76 #include "services/management.hpp"
77 #include "services/threadService.hpp"
78 #include "trace/tracing.hpp"
79 #include "utilities/copy.hpp"
80 #include "utilities/defaultStream.hpp"
81 #include "utilities/dtrace.hpp"
82 #include "utilities/events.hpp"
83 #include "utilities/histogram.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/utf8.hpp"
86 #if INCLUDE_CDS
87 #include "classfile/sharedClassUtil.hpp"
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 if (!klass->is_cloneable()) {
653 ResourceMark rm(THREAD);
654 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
655 }
656
657 // Make shallow object copy
658 const int size = obj->size();
659 oop new_obj_oop = NULL;
660 if (obj->is_array()) {
661 const int length = ((arrayOop)obj())->length();
662 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
663 } else {
664 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
665 }
666
667 HeapAccess<>::clone(obj(), new_obj_oop, size);
668
669 Handle new_obj(THREAD, new_obj_oop);
670 // Caution: this involves a java upcall, so the clone should be
671 // "gc-robust" by this stage.
672 if (klass->has_finalizer()) {
673 assert(obj->is_instance(), "should be instanceOop");
674 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
675 new_obj = Handle(THREAD, new_obj_oop);
676 }
677
678 return JNIHandles::make_local(env, new_obj());
679 JVM_END
680
681 // java.io.File ///////////////////////////////////////////////////////////////
682
683 JVM_LEAF(char*, JVM_NativePath(char* path))
684 JVMWrapper("JVM_NativePath");
685 return os::native_path(path);
686 JVM_END
687
688
689 // Misc. class handling ///////////////////////////////////////////////////////////
690
691
692 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
693 JVMWrapper("JVM_GetCallerClass");
694
695 // Getting the class of the caller frame.
696 //
697 // The call stack at this point looks something like this:
698 //
699 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
700 // [1] [ @CallerSensitive API.method ]
701 // [.] [ (skipped intermediate frames) ]
702 // [n] [ caller ]
703 vframeStream vfst(thread);
704 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
705 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
706 Method* m = vfst.method();
707 assert(m != NULL, "sanity");
708 switch (n) {
709 case 0:
710 // This must only be called from Reflection.getCallerClass
711 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
712 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
713 }
714 // fall-through
715 case 1:
716 // Frame 0 and 1 must be caller sensitive.
717 if (!m->caller_sensitive()) {
718 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
719 }
720 break;
721 default:
722 if (!m->is_ignored_by_security_stack_walk()) {
723 // We have reached the desired frame; return the holder class.
724 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
725 }
726 break;
727 }
728 }
729 return NULL;
730 JVM_END
731
732
733 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
734 JVMWrapper("JVM_FindPrimitiveClass");
735 oop mirror = NULL;
736 BasicType t = name2type(utf);
737 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
738 mirror = Universe::java_mirror(t);
739 }
740 if (mirror == NULL) {
741 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
742 } else {
743 return (jclass) JNIHandles::make_local(env, mirror);
744 }
745 JVM_END
746
747
748 // Returns a class loaded by the bootstrap class loader; or null
749 // if not found. ClassNotFoundException is not thrown.
750 // FindClassFromBootLoader is exported to the launcher for windows.
751 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
752 const char* name))
753 JVMWrapper("JVM_FindClassFromBootLoader");
754
755 // Java libraries should ensure that name is never null...
756 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
757 // It's impossible to create this class; the name cannot fit
758 // into the constant pool.
759 return NULL;
760 }
761
762 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
763 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
764 if (k == NULL) {
765 return NULL;
766 }
767
768 if (log_is_enabled(Debug, class, resolve)) {
769 trace_class_resolution(k);
770 }
771 return (jclass) JNIHandles::make_local(env, k->java_mirror());
772 JVM_END
773
774 // Find a class with this name in this loader, using the caller's protection domain.
775 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
776 jboolean init, jobject loader,
777 jclass caller))
778 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
779 // Java libraries should ensure that name is never null...
780 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
781 // It's impossible to create this class; the name cannot fit
782 // into the constant pool.
783 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
784 }
785
786 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
787
788 oop loader_oop = JNIHandles::resolve(loader);
789 oop from_class = JNIHandles::resolve(caller);
790 oop protection_domain = NULL;
791 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
792 // NPE. Put it in another way, the bootstrap class loader has all permission and
793 // thus no checkPackageAccess equivalence in the VM class loader.
794 // The caller is also passed as NULL by the java code if there is no security
795 // manager to avoid the performance cost of getting the calling class.
796 if (from_class != NULL && loader_oop != NULL) {
797 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
798 }
799
800 Handle h_loader(THREAD, loader_oop);
801 Handle h_prot(THREAD, protection_domain);
802 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
803 h_prot, false, THREAD);
804
805 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
806 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
807 }
808 return result;
809 JVM_END
810
811 // Currently only called from the old verifier.
812 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
813 jboolean init, jclass from))
814 JVMWrapper("JVM_FindClassFromClass");
815 if (name == NULL) {
816 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
817 }
818 if ((int)strlen(name) > Symbol::max_length()) {
819 // It's impossible to create this class; the name cannot fit
820 // into the constant pool.
821 Exceptions::fthrow(THREAD_AND_LOCATION,
822 vmSymbols::java_lang_NoClassDefFoundError(),
823 "Class name exceeds maximum length of %d: %s",
824 Symbol::max_length(),
825 name);
826 return 0;
827 }
828 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
829 oop from_class_oop = JNIHandles::resolve(from);
830 Klass* from_class = (from_class_oop == NULL)
831 ? (Klass*)NULL
832 : java_lang_Class::as_Klass(from_class_oop);
833 oop class_loader = NULL;
834 oop protection_domain = NULL;
835 if (from_class != NULL) {
836 class_loader = from_class->class_loader();
837 protection_domain = from_class->protection_domain();
838 }
839 Handle h_loader(THREAD, class_loader);
840 Handle h_prot (THREAD, protection_domain);
841 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
842 h_prot, true, thread);
843
844 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
845 // this function is generally only used for class loading during verification.
846 ResourceMark rm;
847 oop from_mirror = JNIHandles::resolve_non_null(from);
848 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
849 const char * from_name = from_class->external_name();
850
851 oop mirror = JNIHandles::resolve_non_null(result);
852 Klass* to_class = java_lang_Class::as_Klass(mirror);
853 const char * to = to_class->external_name();
854 log_debug(class, resolve)("%s %s (verification)", from_name, to);
855 }
856
857 return result;
858 JVM_END
859
860 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
861 if (loader.is_null()) {
862 return;
863 }
864
865 // check whether the current caller thread holds the lock or not.
866 // If not, increment the corresponding counter
867 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
868 ObjectSynchronizer::owner_self) {
869 counter->inc();
870 }
871 }
872
873 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
874 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
875 jobject loader, const jbyte *buf,
876 jsize len, jobject pd, const char *source,
877 TRAPS) {
878 if (source == NULL) source = "__JVM_DefineClass__";
879
880 assert(THREAD->is_Java_thread(), "must be a JavaThread");
881 JavaThread* jt = (JavaThread*) THREAD;
882
883 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
884 ClassLoader::perf_define_appclass_selftime(),
885 ClassLoader::perf_define_appclasses(),
886 jt->get_thread_stat()->perf_recursion_counts_addr(),
887 jt->get_thread_stat()->perf_timers_addr(),
888 PerfClassTraceTime::DEFINE_CLASS);
889
890 if (UsePerfData) {
891 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
892 }
893
894 // Since exceptions can be thrown, class initialization can take place
895 // if name is NULL no check for class name in .class stream has to be made.
896 TempNewSymbol class_name = NULL;
897 if (name != NULL) {
898 const int str_len = (int)strlen(name);
899 if (str_len > Symbol::max_length()) {
900 // It's impossible to create this class; the name cannot fit
901 // into the constant pool.
902 Exceptions::fthrow(THREAD_AND_LOCATION,
903 vmSymbols::java_lang_NoClassDefFoundError(),
904 "Class name exceeds maximum length of %d: %s",
905 Symbol::max_length(),
906 name);
907 return 0;
908 }
909 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
910 }
911
912 ResourceMark rm(THREAD);
913 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
914 Handle class_loader (THREAD, JNIHandles::resolve(loader));
915 if (UsePerfData) {
916 is_lock_held_by_thread(class_loader,
917 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
918 THREAD);
919 }
920 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
921 Klass* k = SystemDictionary::resolve_from_stream(class_name,
922 class_loader,
923 protection_domain,
924 &st,
925 CHECK_NULL);
926
927 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
928 trace_class_resolution(k);
929 }
930
931 return (jclass) JNIHandles::make_local(env, k->java_mirror());
932 }
933
934
935 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
936 JVMWrapper("JVM_DefineClass");
937
938 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
939 JVM_END
940
941
942 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
943 JVMWrapper("JVM_DefineClassWithSource");
944
945 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
946 JVM_END
947
948 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
949 JVMWrapper("JVM_FindLoadedClass");
950 ResourceMark rm(THREAD);
951
952 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
953 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
954
955 const char* str = java_lang_String::as_utf8_string(string());
956 // Sanity check, don't expect null
957 if (str == NULL) return NULL;
958
959 const int str_len = (int)strlen(str);
960 if (str_len > Symbol::max_length()) {
961 // It's impossible to create this class; the name cannot fit
962 // into the constant pool.
963 return NULL;
964 }
965 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
966
967 // Security Note:
968 // The Java level wrapper will perform the necessary security check allowing
969 // us to pass the NULL as the initiating class loader.
970 Handle h_loader(THREAD, JNIHandles::resolve(loader));
971 if (UsePerfData) {
972 is_lock_held_by_thread(h_loader,
973 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
974 THREAD);
975 }
976
977 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
978 h_loader,
979 Handle(),
980 CHECK_NULL);
981 #if INCLUDE_CDS
982 if (k == NULL) {
983 // If the class is not already loaded, try to see if it's in the shared
984 // archive for the current classloader (h_loader).
985 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
986 }
987 #endif
988 return (k == NULL) ? NULL :
989 (jclass) JNIHandles::make_local(env, k->java_mirror());
990 JVM_END
991
992 // Module support //////////////////////////////////////////////////////////////////////////////
993
994 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
995 jstring location, const char* const* packages, jsize num_packages))
996 JVMWrapper("JVM_DefineModule");
997 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
998 JVM_END
999
1000 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1001 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1002 Modules::set_bootloader_unnamed_module(module, CHECK);
1003 JVM_END
1004
1005 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1006 JVMWrapper("JVM_AddModuleExports");
1007 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1008 JVM_END
1009
1010 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1011 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1012 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1013 JVM_END
1014
1015 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1016 JVMWrapper("JVM_AddModuleExportsToAll");
1017 Modules::add_module_exports(from_module, package, NULL, CHECK);
1018 JVM_END
1019
1020 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1021 JVMWrapper("JVM_AddReadsModule");
1022 Modules::add_reads_module(from_module, source_module, CHECK);
1023 JVM_END
1024
1025 // Reflection support //////////////////////////////////////////////////////////////////////////////
1026
1027 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1028 assert (cls != NULL, "illegal class");
1029 JVMWrapper("JVM_GetClassName");
1030 JvmtiVMObjectAllocEventCollector oam;
1031 ResourceMark rm(THREAD);
1032 const char* name;
1033 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1034 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1035 } else {
1036 // Consider caching interned string in Klass
1037 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1038 assert(k->is_klass(), "just checking");
1039 name = k->external_name();
1040 }
1041 oop result = StringTable::intern((char*) name, CHECK_NULL);
1042 return (jstring) JNIHandles::make_local(env, result);
1043 JVM_END
1044
1045
1046 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1047 JVMWrapper("JVM_GetClassInterfaces");
1048 JvmtiVMObjectAllocEventCollector oam;
1049 oop mirror = JNIHandles::resolve_non_null(cls);
1050
1051 // Special handling for primitive objects
1052 if (java_lang_Class::is_primitive(mirror)) {
1053 // Primitive objects does not have any interfaces
1054 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1055 return (jobjectArray) JNIHandles::make_local(env, r);
1056 }
1057
1058 Klass* klass = java_lang_Class::as_Klass(mirror);
1059 // Figure size of result array
1060 int size;
1061 if (klass->is_instance_klass()) {
1062 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1063 } else {
1064 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1065 size = 2;
1066 }
1067
1068 // Allocate result array
1069 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1070 objArrayHandle result (THREAD, r);
1071 // Fill in result
1072 if (klass->is_instance_klass()) {
1073 // Regular instance klass, fill in all local interfaces
1074 for (int index = 0; index < size; index++) {
1075 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1076 result->obj_at_put(index, k->java_mirror());
1077 }
1078 } else {
1079 // All arrays implement java.lang.Cloneable and java.io.Serializable
1080 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1081 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1082 }
1083 return (jobjectArray) JNIHandles::make_local(env, result());
1084 JVM_END
1085
1086
1087 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1088 JVMWrapper("JVM_IsInterface");
1089 oop mirror = JNIHandles::resolve_non_null(cls);
1090 if (java_lang_Class::is_primitive(mirror)) {
1091 return JNI_FALSE;
1092 }
1093 Klass* k = java_lang_Class::as_Klass(mirror);
1094 jboolean result = k->is_interface();
1095 assert(!result || k->is_instance_klass(),
1096 "all interfaces are instance types");
1097 // The compiler intrinsic for isInterface tests the
1098 // Klass::_access_flags bits in the same way.
1099 return result;
1100 JVM_END
1101
1102
1103 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1104 JVMWrapper("JVM_GetClassSigners");
1105 JvmtiVMObjectAllocEventCollector oam;
1106 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1107 // There are no signers for primitive types
1108 return NULL;
1109 }
1110
1111 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1112
1113 // If there are no signers set in the class, or if the class
1114 // is an array, return NULL.
1115 if (signers == NULL) return NULL;
1116
1117 // copy of the signers array
1118 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1119 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1120 for (int index = 0; index < signers->length(); index++) {
1121 signers_copy->obj_at_put(index, signers->obj_at(index));
1122 }
1123
1124 // return the copy
1125 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1126 JVM_END
1127
1128
1129 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1130 JVMWrapper("JVM_SetClassSigners");
1131 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1132 // This call is ignored for primitive types and arrays.
1133 // Signers are only set once, ClassLoader.java, and thus shouldn't
1134 // be called with an array. Only the bootstrap loader creates arrays.
1135 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1136 if (k->is_instance_klass()) {
1137 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1138 }
1139 }
1140 JVM_END
1141
1142
1143 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1144 JVMWrapper("JVM_GetProtectionDomain");
1145 if (JNIHandles::resolve(cls) == NULL) {
1146 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1147 }
1148
1149 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1150 // Primitive types does not have a protection domain.
1151 return NULL;
1152 }
1153
1154 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1155 return (jobject) JNIHandles::make_local(env, pd);
1156 JVM_END
1157
1158
1159 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) {
1160 // If there is a security manager and protection domain, check the access
1161 // in the protection domain, otherwise it is authorized.
1162 if (java_lang_System::has_security_manager()) {
1163
1164 // For bootstrapping, if pd implies method isn't in the JDK, allow
1165 // this context to revert to older behavior.
1166 // In this case the isAuthorized field in AccessControlContext is also not
1167 // present.
1168 if (Universe::protection_domain_implies_method() == NULL) {
1169 return true;
1170 }
1171
1172 // Whitelist certain access control contexts
1173 if (java_security_AccessControlContext::is_authorized(context)) {
1174 return true;
1175 }
1176
1177 oop prot = klass->protection_domain();
1178 if (prot != NULL) {
1179 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1180 // in the new wrapper.
1181 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1182 Handle h_prot(THREAD, prot);
1183 JavaValue result(T_BOOLEAN);
1184 JavaCallArguments args(h_prot);
1185 JavaCalls::call(&result, m, &args, CHECK_false);
1186 return (result.get_jboolean() != 0);
1187 }
1188 }
1189 return true;
1190 }
1191
1192 // Create an AccessControlContext with a protection domain with null codesource
1193 // and null permissions - which gives no permissions.
1194 oop create_dummy_access_control_context(TRAPS) {
1195 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1196 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1197 // Call constructor ProtectionDomain(null, null);
1198 JavaValue result(T_VOID);
1199 JavaCalls::call_special(&result, obj, pd_klass,
1200 vmSymbols::object_initializer_name(),
1201 vmSymbols::codesource_permissioncollection_signature(),
1202 Handle(), Handle(), CHECK_NULL);
1203
1204 // new ProtectionDomain[] {pd};
1205 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1206 context->obj_at_put(0, obj());
1207
1208 // new AccessControlContext(new ProtectionDomain[] {pd})
1209 objArrayHandle h_context(THREAD, context);
1210 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1211 return acc;
1212 }
1213
1214 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1215 JVMWrapper("JVM_DoPrivileged");
1216
1217 if (action == NULL) {
1218 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1219 }
1220
1221 // Compute the frame initiating the do privileged operation and setup the privileged stack
1222 vframeStream vfst(thread);
1223 vfst.security_get_caller_frame(1);
1224
1225 if (vfst.at_end()) {
1226 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1227 }
1228
1229 Method* method = vfst.method();
1230 InstanceKlass* klass = method->method_holder();
1231
1232 // Check that action object understands "Object run()"
1233 Handle h_context;
1234 if (context != NULL) {
1235 h_context = Handle(THREAD, JNIHandles::resolve(context));
1236 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1237 if (!authorized) {
1238 // Create an unprivileged access control object and call it's run function
1239 // instead.
1240 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1241 h_context = Handle(THREAD, noprivs);
1242 }
1243 }
1244
1245 // Check that action object understands "Object run()"
1246 Handle object (THREAD, JNIHandles::resolve(action));
1247
1248 // get run() method
1249 Method* m_oop = object->klass()->uncached_lookup_method(
1250 vmSymbols::run_method_name(),
1251 vmSymbols::void_object_signature(),
1252 Klass::find_overpass);
1253
1254 // See if there is a default method for "Object run()".
1255 if (m_oop == NULL && object->klass()->is_instance_klass()) {
1256 InstanceKlass* iklass = InstanceKlass::cast(object->klass());
1257 m_oop = iklass->lookup_method_in_ordered_interfaces(
1258 vmSymbols::run_method_name(),
1259 vmSymbols::void_object_signature());
1260 }
1261
1262 methodHandle m (THREAD, m_oop);
1263 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) {
1264 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1265 }
1266
1267 // Stack allocated list of privileged stack elements
1268 PrivilegedElement pi;
1269 if (!vfst.at_end()) {
1270 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1271 thread->set_privileged_stack_top(&pi);
1272 }
1273
1274
1275 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1276 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1277 Handle pending_exception;
1278 JavaValue result(T_OBJECT);
1279 JavaCallArguments args(object);
1280 JavaCalls::call(&result, m, &args, THREAD);
1281
1282 // done with action, remove ourselves from the list
1283 if (!vfst.at_end()) {
1284 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1285 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1286 }
1287
1288 if (HAS_PENDING_EXCEPTION) {
1289 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1290 CLEAR_PENDING_EXCEPTION;
1291 // JVMTI has already reported the pending exception
1292 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1293 if (THREAD->is_Java_thread()) {
1294 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1295 }
1296 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1297 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1298 // Throw a java.security.PrivilegedActionException(Exception e) exception
1299 JavaCallArguments args(pending_exception);
1300 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1301 vmSymbols::exception_void_signature(),
1302 &args);
1303 }
1304 }
1305
1306 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1307 return JNIHandles::make_local(env, (oop) result.get_jobject());
1308 JVM_END
1309
1310
1311 // Returns the inherited_access_control_context field of the running thread.
1312 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1313 JVMWrapper("JVM_GetInheritedAccessControlContext");
1314 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1315 return JNIHandles::make_local(env, result);
1316 JVM_END
1317
1318 class RegisterArrayForGC {
1319 private:
1320 JavaThread *_thread;
1321 public:
1322 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1323 _thread = thread;
1324 _thread->register_array_for_gc(array);
1325 }
1326
1327 ~RegisterArrayForGC() {
1328 _thread->register_array_for_gc(NULL);
1329 }
1330 };
1331
1332
1333 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1334 JVMWrapper("JVM_GetStackAccessControlContext");
1335 if (!UsePrivilegedStack) return NULL;
1336
1337 ResourceMark rm(THREAD);
1338 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1339 JvmtiVMObjectAllocEventCollector oam;
1340
1341 // count the protection domains on the execution stack. We collapse
1342 // duplicate consecutive protection domains into a single one, as
1343 // well as stopping when we hit a privileged frame.
1344
1345 // Use vframeStream to iterate through Java frames
1346 vframeStream vfst(thread);
1347
1348 oop previous_protection_domain = NULL;
1349 Handle privileged_context(thread, NULL);
1350 bool is_privileged = false;
1351 oop protection_domain = NULL;
1352
1353 for(; !vfst.at_end(); vfst.next()) {
1354 // get method of frame
1355 Method* method = vfst.method();
1356 intptr_t* frame_id = vfst.frame_id();
1357
1358 // check the privileged frames to see if we have a match
1359 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1360 // this frame is privileged
1361 is_privileged = true;
1362 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1363 protection_domain = thread->privileged_stack_top()->protection_domain();
1364 } else {
1365 protection_domain = method->method_holder()->protection_domain();
1366 }
1367
1368 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1369 local_array->push(protection_domain);
1370 previous_protection_domain = protection_domain;
1371 }
1372
1373 if (is_privileged) break;
1374 }
1375
1376
1377 // either all the domains on the stack were system domains, or
1378 // we had a privileged system domain
1379 if (local_array->is_empty()) {
1380 if (is_privileged && privileged_context.is_null()) return NULL;
1381
1382 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1383 return JNIHandles::make_local(env, result);
1384 }
1385
1386 // the resource area must be registered in case of a gc
1387 RegisterArrayForGC ragc(thread, local_array);
1388 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1389 local_array->length(), CHECK_NULL);
1390 objArrayHandle h_context(thread, context);
1391 for (int index = 0; index < local_array->length(); index++) {
1392 h_context->obj_at_put(index, local_array->at(index));
1393 }
1394
1395 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1396
1397 return JNIHandles::make_local(env, result);
1398 JVM_END
1399
1400
1401 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1402 JVMWrapper("JVM_IsArrayClass");
1403 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1404 return (k != NULL) && k->is_array_klass() ? true : false;
1405 JVM_END
1406
1407
1408 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1409 JVMWrapper("JVM_IsPrimitiveClass");
1410 oop mirror = JNIHandles::resolve_non_null(cls);
1411 return (jboolean) java_lang_Class::is_primitive(mirror);
1412 JVM_END
1413
1414
1415 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1416 JVMWrapper("JVM_GetClassModifiers");
1417 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1418 // Primitive type
1419 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1420 }
1421
1422 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1423 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1424 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1425 return k->modifier_flags();
1426 JVM_END
1427
1428
1429 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1430
1431 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1432 JvmtiVMObjectAllocEventCollector oam;
1433 // ofClass is a reference to a java_lang_Class object. The mirror object
1434 // of an InstanceKlass
1435
1436 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1437 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1438 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1439 return (jobjectArray)JNIHandles::make_local(env, result);
1440 }
1441
1442 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1443 InnerClassesIterator iter(k);
1444
1445 if (iter.length() == 0) {
1446 // Neither an inner nor outer class
1447 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1448 return (jobjectArray)JNIHandles::make_local(env, result);
1449 }
1450
1451 // find inner class info
1452 constantPoolHandle cp(thread, k->constants());
1453 int length = iter.length();
1454
1455 // Allocate temp. result array
1456 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1457 objArrayHandle result (THREAD, r);
1458 int members = 0;
1459
1460 for (; !iter.done(); iter.next()) {
1461 int ioff = iter.inner_class_info_index();
1462 int ooff = iter.outer_class_info_index();
1463
1464 if (ioff != 0 && ooff != 0) {
1465 // Check to see if the name matches the class we're looking for
1466 // before attempting to find the class.
1467 if (cp->klass_name_at_matches(k, ooff)) {
1468 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1469 if (outer_klass == k) {
1470 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1471 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1472
1473 // Throws an exception if outer klass has not declared k as
1474 // an inner klass
1475 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1476
1477 result->obj_at_put(members, inner_klass->java_mirror());
1478 members++;
1479 }
1480 }
1481 }
1482 }
1483
1484 if (members != length) {
1485 // Return array of right length
1486 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1487 for(int i = 0; i < members; i++) {
1488 res->obj_at_put(i, result->obj_at(i));
1489 }
1490 return (jobjectArray)JNIHandles::make_local(env, res);
1491 }
1492
1493 return (jobjectArray)JNIHandles::make_local(env, result());
1494 JVM_END
1495
1496
1497 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1498 {
1499 // ofClass is a reference to a java_lang_Class object.
1500 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1501 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1502 return NULL;
1503 }
1504
1505 bool inner_is_member = false;
1506 Klass* outer_klass
1507 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1508 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1509 if (outer_klass == NULL) return NULL; // already a top-level class
1510 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1511 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1512 }
1513 JVM_END
1514
1515 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1516 {
1517 oop mirror = JNIHandles::resolve_non_null(cls);
1518 if (java_lang_Class::is_primitive(mirror) ||
1519 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1520 return NULL;
1521 }
1522 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1523 int ooff = 0, noff = 0;
1524 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1525 if (noff != 0) {
1526 constantPoolHandle i_cp(thread, k->constants());
1527 Symbol* name = i_cp->symbol_at(noff);
1528 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1529 return (jstring) JNIHandles::make_local(env, str());
1530 }
1531 }
1532 return NULL;
1533 }
1534 JVM_END
1535
1536 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1537 assert (cls != NULL, "illegal class");
1538 JVMWrapper("JVM_GetClassSignature");
1539 JvmtiVMObjectAllocEventCollector oam;
1540 ResourceMark rm(THREAD);
1541 // Return null for arrays and primatives
1542 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1544 if (k->is_instance_klass()) {
1545 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1546 if (sym == NULL) return NULL;
1547 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1548 return (jstring) JNIHandles::make_local(env, str());
1549 }
1550 }
1551 return NULL;
1552 JVM_END
1553
1554
1555 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1556 assert (cls != NULL, "illegal class");
1557 JVMWrapper("JVM_GetClassAnnotations");
1558
1559 // Return null for arrays and primitives
1560 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1561 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1562 if (k->is_instance_klass()) {
1563 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1564 return (jbyteArray) JNIHandles::make_local(env, a);
1565 }
1566 }
1567 return NULL;
1568 JVM_END
1569
1570
1571 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1572 // some of this code was adapted from from jni_FromReflectedField
1573
1574 oop reflected = JNIHandles::resolve_non_null(field);
1575 oop mirror = java_lang_reflect_Field::clazz(reflected);
1576 Klass* k = java_lang_Class::as_Klass(mirror);
1577 int slot = java_lang_reflect_Field::slot(reflected);
1578 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1579
1580 InstanceKlass* ik = InstanceKlass::cast(k);
1581 intptr_t offset = ik->field_offset(slot);
1582
1583 if (modifiers & JVM_ACC_STATIC) {
1584 // for static fields we only look in the current class
1585 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1586 assert(false, "cannot find static field");
1587 return false;
1588 }
1589 } else {
1590 // for instance fields we start with the current class and work
1591 // our way up through the superclass chain
1592 if (!ik->find_field_from_offset(offset, false, &fd)) {
1593 assert(false, "cannot find instance field");
1594 return false;
1595 }
1596 }
1597 return true;
1598 }
1599
1600 static Method* jvm_get_method_common(jobject method) {
1601 // some of this code was adapted from from jni_FromReflectedMethod
1602
1603 oop reflected = JNIHandles::resolve_non_null(method);
1604 oop mirror = NULL;
1605 int slot = 0;
1606
1607 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1608 mirror = java_lang_reflect_Constructor::clazz(reflected);
1609 slot = java_lang_reflect_Constructor::slot(reflected);
1610 } else {
1611 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1612 "wrong type");
1613 mirror = java_lang_reflect_Method::clazz(reflected);
1614 slot = java_lang_reflect_Method::slot(reflected);
1615 }
1616 Klass* k = java_lang_Class::as_Klass(mirror);
1617
1618 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1619 assert(m != NULL, "cannot find method");
1620 return m; // caller has to deal with NULL in product mode
1621 }
1622
1623 /* Type use annotations support (JDK 1.8) */
1624
1625 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1626 assert (cls != NULL, "illegal class");
1627 JVMWrapper("JVM_GetClassTypeAnnotations");
1628 ResourceMark rm(THREAD);
1629 // Return null for arrays and primitives
1630 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1631 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1632 if (k->is_instance_klass()) {
1633 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1634 if (type_annotations != NULL) {
1635 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1636 return (jbyteArray) JNIHandles::make_local(env, a);
1637 }
1638 }
1639 }
1640 return NULL;
1641 JVM_END
1642
1643 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1644 assert (method != NULL, "illegal method");
1645 JVMWrapper("JVM_GetMethodTypeAnnotations");
1646
1647 // method is a handle to a java.lang.reflect.Method object
1648 Method* m = jvm_get_method_common(method);
1649 if (m == NULL) {
1650 return NULL;
1651 }
1652
1653 AnnotationArray* type_annotations = m->type_annotations();
1654 if (type_annotations != NULL) {
1655 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1656 return (jbyteArray) JNIHandles::make_local(env, a);
1657 }
1658
1659 return NULL;
1660 JVM_END
1661
1662 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1663 assert (field != NULL, "illegal field");
1664 JVMWrapper("JVM_GetFieldTypeAnnotations");
1665
1666 fieldDescriptor fd;
1667 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1668 if (!gotFd) {
1669 return NULL;
1670 }
1671
1672 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1673 JVM_END
1674
1675 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1676 if (!cp->is_within_bounds(index)) {
1677 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1678 }
1679 }
1680
1681 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1682 {
1683 JVMWrapper("JVM_GetMethodParameters");
1684 // method is a handle to a java.lang.reflect.Method object
1685 Method* method_ptr = jvm_get_method_common(method);
1686 methodHandle mh (THREAD, method_ptr);
1687 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1688 const int num_params = mh->method_parameters_length();
1689
1690 if (num_params < 0) {
1691 // A -1 return value from method_parameters_length means there is no
1692 // parameter data. Return null to indicate this to the reflection
1693 // API.
1694 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1695 return (jobjectArray)NULL;
1696 } else {
1697 // Otherwise, we return something up to reflection, even if it is
1698 // a zero-length array. Why? Because in some cases this can
1699 // trigger a MalformedParametersException.
1700
1701 // make sure all the symbols are properly formatted
1702 for (int i = 0; i < num_params; i++) {
1703 MethodParametersElement* params = mh->method_parameters_start();
1704 int index = params[i].name_cp_index;
1705 bounds_check(mh->constants(), index, CHECK_NULL);
1706
1707 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1708 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1709 "Wrong type at constant pool index");
1710 }
1711
1712 }
1713
1714 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1715 objArrayHandle result (THREAD, result_oop);
1716
1717 for (int i = 0; i < num_params; i++) {
1718 MethodParametersElement* params = mh->method_parameters_start();
1719 // For a 0 index, give a NULL symbol
1720 Symbol* sym = 0 != params[i].name_cp_index ?
1721 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1722 int flags = params[i].flags;
1723 oop param = Reflection::new_parameter(reflected_method, i, sym,
1724 flags, CHECK_NULL);
1725 result->obj_at_put(i, param);
1726 }
1727 return (jobjectArray)JNIHandles::make_local(env, result());
1728 }
1729 }
1730 JVM_END
1731
1732 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1733
1734 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1735 {
1736 JVMWrapper("JVM_GetClassDeclaredFields");
1737 JvmtiVMObjectAllocEventCollector oam;
1738
1739 // Exclude primitive types and array types
1740 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1741 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1742 // Return empty array
1743 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1744 return (jobjectArray) JNIHandles::make_local(env, res);
1745 }
1746
1747 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1748 constantPoolHandle cp(THREAD, k->constants());
1749
1750 // Ensure class is linked
1751 k->link_class(CHECK_NULL);
1752
1753 // Allocate result
1754 int num_fields;
1755
1756 if (publicOnly) {
1757 num_fields = 0;
1758 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1759 if (fs.access_flags().is_public()) ++num_fields;
1760 }
1761 } else {
1762 num_fields = k->java_fields_count();
1763 }
1764
1765 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1766 objArrayHandle result (THREAD, r);
1767
1768 int out_idx = 0;
1769 fieldDescriptor fd;
1770 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1771 if (!publicOnly || fs.access_flags().is_public()) {
1772 fd.reinitialize(k, fs.index());
1773 oop field = Reflection::new_field(&fd, CHECK_NULL);
1774 result->obj_at_put(out_idx, field);
1775 ++out_idx;
1776 }
1777 }
1778 assert(out_idx == num_fields, "just checking");
1779 return (jobjectArray) JNIHandles::make_local(env, result());
1780 }
1781 JVM_END
1782
1783 static bool select_method(const methodHandle& method, bool want_constructor) {
1784 if (want_constructor) {
1785 return (method->is_initializer() && !method->is_static());
1786 } else {
1787 return (!method->is_initializer() && !method->is_overpass());
1788 }
1789 }
1790
1791 static jobjectArray get_class_declared_methods_helper(
1792 JNIEnv *env,
1793 jclass ofClass, jboolean publicOnly,
1794 bool want_constructor,
1795 Klass* klass, TRAPS) {
1796
1797 JvmtiVMObjectAllocEventCollector oam;
1798
1799 // Exclude primitive types and array types
1800 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1801 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1802 // Return empty array
1803 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1804 return (jobjectArray) JNIHandles::make_local(env, res);
1805 }
1806
1807 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1808
1809 // Ensure class is linked
1810 k->link_class(CHECK_NULL);
1811
1812 Array<Method*>* methods = k->methods();
1813 int methods_length = methods->length();
1814
1815 // Save original method_idnum in case of redefinition, which can change
1816 // the idnum of obsolete methods. The new method will have the same idnum
1817 // but if we refresh the methods array, the counts will be wrong.
1818 ResourceMark rm(THREAD);
1819 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1820 int num_methods = 0;
1821
1822 for (int i = 0; i < methods_length; i++) {
1823 methodHandle method(THREAD, methods->at(i));
1824 if (select_method(method, want_constructor)) {
1825 if (!publicOnly || method->is_public()) {
1826 idnums->push(method->method_idnum());
1827 ++num_methods;
1828 }
1829 }
1830 }
1831
1832 // Allocate result
1833 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1834 objArrayHandle result (THREAD, r);
1835
1836 // Now just put the methods that we selected above, but go by their idnum
1837 // in case of redefinition. The methods can be redefined at any safepoint,
1838 // so above when allocating the oop array and below when creating reflect
1839 // objects.
1840 for (int i = 0; i < num_methods; i++) {
1841 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1842 if (method.is_null()) {
1843 // Method may have been deleted and seems this API can handle null
1844 // Otherwise should probably put a method that throws NSME
1845 result->obj_at_put(i, NULL);
1846 } else {
1847 oop m;
1848 if (want_constructor) {
1849 m = Reflection::new_constructor(method, CHECK_NULL);
1850 } else {
1851 m = Reflection::new_method(method, false, CHECK_NULL);
1852 }
1853 result->obj_at_put(i, m);
1854 }
1855 }
1856
1857 return (jobjectArray) JNIHandles::make_local(env, result());
1858 }
1859
1860 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1861 {
1862 JVMWrapper("JVM_GetClassDeclaredMethods");
1863 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1864 /*want_constructor*/ false,
1865 SystemDictionary::reflect_Method_klass(), THREAD);
1866 }
1867 JVM_END
1868
1869 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1870 {
1871 JVMWrapper("JVM_GetClassDeclaredConstructors");
1872 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1873 /*want_constructor*/ true,
1874 SystemDictionary::reflect_Constructor_klass(), THREAD);
1875 }
1876 JVM_END
1877
1878 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1879 {
1880 JVMWrapper("JVM_GetClassAccessFlags");
1881 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1882 // Primitive type
1883 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1884 }
1885
1886 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1887 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1888 }
1889 JVM_END
1890
1891
1892 // Constant pool access //////////////////////////////////////////////////////////
1893
1894 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1895 {
1896 JVMWrapper("JVM_GetClassConstantPool");
1897 JvmtiVMObjectAllocEventCollector oam;
1898
1899 // Return null for primitives and arrays
1900 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1901 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1902 if (k->is_instance_klass()) {
1903 InstanceKlass* k_h = InstanceKlass::cast(k);
1904 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1905 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1906 return JNIHandles::make_local(jcp());
1907 }
1908 }
1909 return NULL;
1910 }
1911 JVM_END
1912
1913
1914 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1915 {
1916 JVMWrapper("JVM_ConstantPoolGetSize");
1917 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1918 return cp->length();
1919 }
1920 JVM_END
1921
1922
1923 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1924 {
1925 JVMWrapper("JVM_ConstantPoolGetClassAt");
1926 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1927 bounds_check(cp, index, CHECK_NULL);
1928 constantTag tag = cp->tag_at(index);
1929 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1930 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1931 }
1932 Klass* k = cp->klass_at(index, CHECK_NULL);
1933 return (jclass) JNIHandles::make_local(k->java_mirror());
1934 }
1935 JVM_END
1936
1937 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1938 {
1939 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1940 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1941 bounds_check(cp, index, CHECK_NULL);
1942 constantTag tag = cp->tag_at(index);
1943 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1944 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1945 }
1946 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1947 if (k == NULL) return NULL;
1948 return (jclass) JNIHandles::make_local(k->java_mirror());
1949 }
1950 JVM_END
1951
1952 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1953 constantTag tag = cp->tag_at(index);
1954 if (!tag.is_method() && !tag.is_interface_method()) {
1955 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1956 }
1957 int klass_ref = cp->uncached_klass_ref_index_at(index);
1958 Klass* k_o;
1959 if (force_resolution) {
1960 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1961 } else {
1962 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1963 if (k_o == NULL) return NULL;
1964 }
1965 InstanceKlass* k = InstanceKlass::cast(k_o);
1966 Symbol* name = cp->uncached_name_ref_at(index);
1967 Symbol* sig = cp->uncached_signature_ref_at(index);
1968 methodHandle m (THREAD, k->find_method(name, sig));
1969 if (m.is_null()) {
1970 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1971 }
1972 oop method;
1973 if (!m->is_initializer() || m->is_static()) {
1974 method = Reflection::new_method(m, true, CHECK_NULL);
1975 } else {
1976 method = Reflection::new_constructor(m, CHECK_NULL);
1977 }
1978 return JNIHandles::make_local(method);
1979 }
1980
1981 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1982 {
1983 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1984 JvmtiVMObjectAllocEventCollector oam;
1985 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1986 bounds_check(cp, index, CHECK_NULL);
1987 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1988 return res;
1989 }
1990 JVM_END
1991
1992 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1993 {
1994 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1995 JvmtiVMObjectAllocEventCollector oam;
1996 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1997 bounds_check(cp, index, CHECK_NULL);
1998 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1999 return res;
2000 }
2001 JVM_END
2002
2003 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2004 constantTag tag = cp->tag_at(index);
2005 if (!tag.is_field()) {
2006 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2007 }
2008 int klass_ref = cp->uncached_klass_ref_index_at(index);
2009 Klass* k_o;
2010 if (force_resolution) {
2011 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2012 } else {
2013 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2014 if (k_o == NULL) return NULL;
2015 }
2016 InstanceKlass* k = InstanceKlass::cast(k_o);
2017 Symbol* name = cp->uncached_name_ref_at(index);
2018 Symbol* sig = cp->uncached_signature_ref_at(index);
2019 fieldDescriptor fd;
2020 Klass* target_klass = k->find_field(name, sig, &fd);
2021 if (target_klass == NULL) {
2022 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2023 }
2024 oop field = Reflection::new_field(&fd, CHECK_NULL);
2025 return JNIHandles::make_local(field);
2026 }
2027
2028 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2029 {
2030 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2031 JvmtiVMObjectAllocEventCollector oam;
2032 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2033 bounds_check(cp, index, CHECK_NULL);
2034 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2035 return res;
2036 }
2037 JVM_END
2038
2039 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2040 {
2041 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2042 JvmtiVMObjectAllocEventCollector oam;
2043 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2044 bounds_check(cp, index, CHECK_NULL);
2045 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2046 return res;
2047 }
2048 JVM_END
2049
2050 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2051 {
2052 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2053 JvmtiVMObjectAllocEventCollector oam;
2054 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2055 bounds_check(cp, index, CHECK_NULL);
2056 constantTag tag = cp->tag_at(index);
2057 if (!tag.is_field_or_method()) {
2058 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2059 }
2060 int klass_ref = cp->uncached_klass_ref_index_at(index);
2061 Symbol* klass_name = cp->klass_name_at(klass_ref);
2062 Symbol* member_name = cp->uncached_name_ref_at(index);
2063 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2064 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2065 objArrayHandle dest(THREAD, dest_o);
2066 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2067 dest->obj_at_put(0, str());
2068 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2069 dest->obj_at_put(1, str());
2070 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2071 dest->obj_at_put(2, str());
2072 return (jobjectArray) JNIHandles::make_local(dest());
2073 }
2074 JVM_END
2075
2076 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2077 {
2078 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2079 JvmtiVMObjectAllocEventCollector oam;
2080 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2081 bounds_check(cp, index, CHECK_0);
2082 constantTag tag = cp->tag_at(index);
2083 if (!tag.is_field_or_method()) {
2084 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2085 }
2086 return (jint) cp->uncached_klass_ref_index_at(index);
2087 }
2088 JVM_END
2089
2090 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2091 {
2092 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2093 JvmtiVMObjectAllocEventCollector oam;
2094 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2095 bounds_check(cp, index, CHECK_0);
2096 constantTag tag = cp->tag_at(index);
2097 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2098 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2099 }
2100 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2101 }
2102 JVM_END
2103
2104 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2105 {
2106 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2107 JvmtiVMObjectAllocEventCollector oam;
2108 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2109 bounds_check(cp, index, CHECK_NULL);
2110 constantTag tag = cp->tag_at(index);
2111 if (!tag.is_name_and_type()) {
2112 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2113 }
2114 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2115 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2116 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2117 objArrayHandle dest(THREAD, dest_o);
2118 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2119 dest->obj_at_put(0, str());
2120 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2121 dest->obj_at_put(1, str());
2122 return (jobjectArray) JNIHandles::make_local(dest());
2123 }
2124 JVM_END
2125
2126 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2127 {
2128 JVMWrapper("JVM_ConstantPoolGetIntAt");
2129 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2130 bounds_check(cp, index, CHECK_0);
2131 constantTag tag = cp->tag_at(index);
2132 if (!tag.is_int()) {
2133 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2134 }
2135 return cp->int_at(index);
2136 }
2137 JVM_END
2138
2139 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2140 {
2141 JVMWrapper("JVM_ConstantPoolGetLongAt");
2142 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2143 bounds_check(cp, index, CHECK_(0L));
2144 constantTag tag = cp->tag_at(index);
2145 if (!tag.is_long()) {
2146 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2147 }
2148 return cp->long_at(index);
2149 }
2150 JVM_END
2151
2152 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2153 {
2154 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2155 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2156 bounds_check(cp, index, CHECK_(0.0f));
2157 constantTag tag = cp->tag_at(index);
2158 if (!tag.is_float()) {
2159 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2160 }
2161 return cp->float_at(index);
2162 }
2163 JVM_END
2164
2165 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2166 {
2167 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2168 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2169 bounds_check(cp, index, CHECK_(0.0));
2170 constantTag tag = cp->tag_at(index);
2171 if (!tag.is_double()) {
2172 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2173 }
2174 return cp->double_at(index);
2175 }
2176 JVM_END
2177
2178 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2179 {
2180 JVMWrapper("JVM_ConstantPoolGetStringAt");
2181 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2182 bounds_check(cp, index, CHECK_NULL);
2183 constantTag tag = cp->tag_at(index);
2184 if (!tag.is_string()) {
2185 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2186 }
2187 oop str = cp->string_at(index, CHECK_NULL);
2188 return (jstring) JNIHandles::make_local(str);
2189 }
2190 JVM_END
2191
2192 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2193 {
2194 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2195 JvmtiVMObjectAllocEventCollector oam;
2196 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2197 bounds_check(cp, index, CHECK_NULL);
2198 constantTag tag = cp->tag_at(index);
2199 if (!tag.is_symbol()) {
2200 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2201 }
2202 Symbol* sym = cp->symbol_at(index);
2203 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2204 return (jstring) JNIHandles::make_local(str());
2205 }
2206 JVM_END
2207
2208 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2209 {
2210 JVMWrapper("JVM_ConstantPoolGetTagAt");
2211 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2212 bounds_check(cp, index, CHECK_0);
2213 constantTag tag = cp->tag_at(index);
2214 jbyte result = tag.value();
2215 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2216 // they are changed to the corresponding tags from the JVM spec, so that java code in
2217 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2218 if (tag.is_klass_or_reference()) {
2219 result = JVM_CONSTANT_Class;
2220 } else if (tag.is_string_index()) {
2221 result = JVM_CONSTANT_String;
2222 } else if (tag.is_method_type_in_error()) {
2223 result = JVM_CONSTANT_MethodType;
2224 } else if (tag.is_method_handle_in_error()) {
2225 result = JVM_CONSTANT_MethodHandle;
2226 } else if (tag.is_dynamic_constant_in_error()) {
2227 result = JVM_CONSTANT_Dynamic;
2228 }
2229 return result;
2230 }
2231 JVM_END
2232
2233 // Assertion support. //////////////////////////////////////////////////////////
2234
2235 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2236 JVMWrapper("JVM_DesiredAssertionStatus");
2237 assert(cls != NULL, "bad class");
2238
2239 oop r = JNIHandles::resolve(cls);
2240 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2241 if (java_lang_Class::is_primitive(r)) return false;
2242
2243 Klass* k = java_lang_Class::as_Klass(r);
2244 assert(k->is_instance_klass(), "must be an instance klass");
2245 if (!k->is_instance_klass()) return false;
2246
2247 ResourceMark rm(THREAD);
2248 const char* name = k->name()->as_C_string();
2249 bool system_class = k->class_loader() == NULL;
2250 return JavaAssertions::enabled(name, system_class);
2251
2252 JVM_END
2253
2254
2255 // Return a new AssertionStatusDirectives object with the fields filled in with
2256 // command-line assertion arguments (i.e., -ea, -da).
2257 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2258 JVMWrapper("JVM_AssertionStatusDirectives");
2259 JvmtiVMObjectAllocEventCollector oam;
2260 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2261 return JNIHandles::make_local(env, asd);
2262 JVM_END
2263
2264 // Arrays support /////////////////////////////////////////////////////////////
2265
2266 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2267 JVMWrapper("JVM_ArrayIsAccessAtomic");
2268 oop o = JNIHandles::resolve(array);
2269 Klass* k = o->klass();
2270 if ((o == NULL) || (!k->is_array_klass())) {
2271 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2272 }
2273 if (k->is_valueArray_klass()) {
2274 return ValueArrayKlass::cast(k)->is_atomic();
2275 }
2276 return true;
2277 JVM_END
2278
2279 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2280 JVMWrapper("JVM_ArrayEnsureAccessAtomic");
2281 oop o = JNIHandles::resolve(array);
2282 Klass* k = o->klass();
2283 if ((o == NULL) || (!k->is_array_klass())) {
2284 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2285 }
2286 if (k->is_valueArray_klass()) {
2287 ValueArrayKlass* vk = ValueArrayKlass::cast(k);
2288 if (!vk->is_atomic()) {
2289 /**
2290 * Need to decide how to implement:
2291 *
2292 * 1) Change to objArrayOop layout, therefore oop->klass() differs so
2293 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through
2294 * "checkcast" & "instanceof"
2295 *
2296 * 2) Use extra header in the valueArrayOop to flag atomicity required and
2297 * possibly per instance lock structure. Said info, could be placed in
2298 * "trailer" rather than disturb the current arrayOop
2299 */
2300 Unimplemented();
2301 }
2302 }
2303 return array;
2304 JVM_END
2305
2306 // Verification ////////////////////////////////////////////////////////////////////////////////
2307
2308 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2309
2310 // RedefineClasses support: bug 6214132 caused verification to fail.
2311 // All functions from this section should call the jvmtiThreadSate function:
2312 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2313 // The function returns a Klass* of the _scratch_class if the verifier
2314 // was invoked in the middle of the class redefinition.
2315 // Otherwise it returns its argument value which is the _the_class Klass*.
2316 // Please, refer to the description in the jvmtiThreadSate.hpp.
2317
2318 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2319 JVMWrapper("JVM_GetClassNameUTF");
2320 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2321 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2322 return k->name()->as_utf8();
2323 JVM_END
2324
2325
2326 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2327 JVMWrapper("JVM_GetClassCPTypes");
2328 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2329 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2330 // types will have length zero if this is not an InstanceKlass
2331 // (length is determined by call to JVM_GetClassCPEntriesCount)
2332 if (k->is_instance_klass()) {
2333 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2334 for (int index = cp->length() - 1; index >= 0; index--) {
2335 constantTag tag = cp->tag_at(index);
2336 types[index] = tag.is_unresolved_klass() ? JVM_CONSTANT_Class : tag.value();
2337 }
2338 }
2339 JVM_END
2340
2341
2342 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2343 JVMWrapper("JVM_GetClassCPEntriesCount");
2344 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2345 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2346 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2347 JVM_END
2348
2349
2350 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2351 JVMWrapper("JVM_GetClassFieldsCount");
2352 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2353 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2354 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2355 JVM_END
2356
2357
2358 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2359 JVMWrapper("JVM_GetClassMethodsCount");
2360 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2361 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2362 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2363 JVM_END
2364
2365
2366 // The following methods, used for the verifier, are never called with
2367 // array klasses, so a direct cast to InstanceKlass is safe.
2368 // Typically, these methods are called in a loop with bounds determined
2369 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2370 // zero for arrays.
2371 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2372 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2373 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2374 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2375 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2376 int length = method->checked_exceptions_length();
2377 if (length > 0) {
2378 CheckedExceptionElement* table= method->checked_exceptions_start();
2379 for (int i = 0; i < length; i++) {
2380 exceptions[i] = table[i].class_cp_index;
2381 }
2382 }
2383 JVM_END
2384
2385
2386 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2387 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2388 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2389 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2390 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2391 return method->checked_exceptions_length();
2392 JVM_END
2393
2394
2395 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2396 JVMWrapper("JVM_GetMethodIxByteCode");
2397 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2398 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2399 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2400 memcpy(code, method->code_base(), method->code_size());
2401 JVM_END
2402
2403
2404 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2405 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2406 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2407 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2408 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2409 return method->code_size();
2410 JVM_END
2411
2412
2413 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2414 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2415 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2416 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2417 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2418 ExceptionTable extable(method);
2419 entry->start_pc = extable.start_pc(entry_index);
2420 entry->end_pc = extable.end_pc(entry_index);
2421 entry->handler_pc = extable.handler_pc(entry_index);
2422 entry->catchType = extable.catch_type_index(entry_index);
2423 JVM_END
2424
2425
2426 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2427 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2428 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2429 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2430 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2431 return method->exception_table_length();
2432 JVM_END
2433
2434
2435 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2436 JVMWrapper("JVM_GetMethodIxModifiers");
2437 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2438 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2439 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2440 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2441 JVM_END
2442
2443
2444 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2445 JVMWrapper("JVM_GetFieldIxModifiers");
2446 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2447 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2448 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2449 JVM_END
2450
2451
2452 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2453 JVMWrapper("JVM_GetMethodIxLocalsCount");
2454 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2455 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2456 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2457 return method->max_locals();
2458 JVM_END
2459
2460
2461 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2462 JVMWrapper("JVM_GetMethodIxArgsSize");
2463 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2464 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2465 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2466 return method->size_of_parameters();
2467 JVM_END
2468
2469
2470 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2471 JVMWrapper("JVM_GetMethodIxMaxStack");
2472 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2473 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2474 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2475 return method->verifier_max_stack();
2476 JVM_END
2477
2478
2479 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2480 JVMWrapper("JVM_IsConstructorIx");
2481 ResourceMark rm(THREAD);
2482 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2483 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2484 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2485 return method->name() == vmSymbols::object_initializer_name();
2486 JVM_END
2487
2488
2489 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2490 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2491 ResourceMark rm(THREAD);
2492 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2493 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2494 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2495 return method->is_overpass();
2496 JVM_END
2497
2498 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2499 JVMWrapper("JVM_GetMethodIxIxUTF");
2500 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2501 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2502 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2503 return method->name()->as_utf8();
2504 JVM_END
2505
2506
2507 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2508 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2509 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2510 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2511 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2512 return method->signature()->as_utf8();
2513 JVM_END
2514
2515 /**
2516 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2517 * read entries in the constant pool. Since the old verifier always
2518 * works on a copy of the code, it will not see any rewriting that
2519 * may possibly occur in the middle of verification. So it is important
2520 * that nothing it calls tries to use the cpCache instead of the raw
2521 * constant pool, so we must use cp->uncached_x methods when appropriate.
2522 */
2523 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2524 JVMWrapper("JVM_GetCPFieldNameUTF");
2525 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2526 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2527 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2528 switch (cp->tag_at(cp_index).value()) {
2529 case JVM_CONSTANT_Fieldref:
2530 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2531 default:
2532 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2533 }
2534 ShouldNotReachHere();
2535 return NULL;
2536 JVM_END
2537
2538
2539 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2540 JVMWrapper("JVM_GetCPMethodNameUTF");
2541 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2542 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2543 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2544 switch (cp->tag_at(cp_index).value()) {
2545 case JVM_CONSTANT_InterfaceMethodref:
2546 case JVM_CONSTANT_Methodref:
2547 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2548 default:
2549 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2550 }
2551 ShouldNotReachHere();
2552 return NULL;
2553 JVM_END
2554
2555
2556 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2557 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2558 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2559 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2560 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2561 switch (cp->tag_at(cp_index).value()) {
2562 case JVM_CONSTANT_InterfaceMethodref:
2563 case JVM_CONSTANT_Methodref:
2564 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2565 default:
2566 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2567 }
2568 ShouldNotReachHere();
2569 return NULL;
2570 JVM_END
2571
2572
2573 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2574 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2575 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2576 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2577 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2578 switch (cp->tag_at(cp_index).value()) {
2579 case JVM_CONSTANT_Fieldref:
2580 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2581 default:
2582 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2583 }
2584 ShouldNotReachHere();
2585 return NULL;
2586 JVM_END
2587
2588
2589 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2590 JVMWrapper("JVM_GetCPClassNameUTF");
2591 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2592 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2593 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2594 Symbol* classname = cp->klass_name_at(cp_index);
2595 return classname->as_utf8();
2596 JVM_END
2597
2598
2599 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2600 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2601 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2602 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2603 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2604 switch (cp->tag_at(cp_index).value()) {
2605 case JVM_CONSTANT_Fieldref: {
2606 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2607 Symbol* classname = cp->klass_name_at(class_index);
2608 return classname->as_utf8();
2609 }
2610 default:
2611 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2612 }
2613 ShouldNotReachHere();
2614 return NULL;
2615 JVM_END
2616
2617
2618 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2619 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2620 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2621 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2622 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2623 switch (cp->tag_at(cp_index).value()) {
2624 case JVM_CONSTANT_Methodref:
2625 case JVM_CONSTANT_InterfaceMethodref: {
2626 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2627 Symbol* classname = cp->klass_name_at(class_index);
2628 return classname->as_utf8();
2629 }
2630 default:
2631 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2632 }
2633 ShouldNotReachHere();
2634 return NULL;
2635 JVM_END
2636
2637
2638 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2639 JVMWrapper("JVM_GetCPFieldModifiers");
2640 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2641 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2642 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2643 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2644 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2645 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2646 switch (cp->tag_at(cp_index).value()) {
2647 case JVM_CONSTANT_Fieldref: {
2648 Symbol* name = cp->uncached_name_ref_at(cp_index);
2649 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2650 InstanceKlass* ik = InstanceKlass::cast(k_called);
2651 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2652 if (fs.name() == name && fs.signature() == signature) {
2653 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2654 }
2655 }
2656 return -1;
2657 }
2658 default:
2659 fatal("JVM_GetCPFieldModifiers: illegal constant");
2660 }
2661 ShouldNotReachHere();
2662 return 0;
2663 JVM_END
2664
2665
2666 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2667 JVMWrapper("JVM_GetCPMethodModifiers");
2668 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2669 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2670 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2671 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2672 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2673 switch (cp->tag_at(cp_index).value()) {
2674 case JVM_CONSTANT_Methodref:
2675 case JVM_CONSTANT_InterfaceMethodref: {
2676 Symbol* name = cp->uncached_name_ref_at(cp_index);
2677 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2678 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2679 int methods_count = methods->length();
2680 for (int i = 0; i < methods_count; i++) {
2681 Method* method = methods->at(i);
2682 if (method->name() == name && method->signature() == signature) {
2683 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2684 }
2685 }
2686 return -1;
2687 }
2688 default:
2689 fatal("JVM_GetCPMethodModifiers: illegal constant");
2690 }
2691 ShouldNotReachHere();
2692 return 0;
2693 JVM_END
2694
2695
2696 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2697
2698 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2699 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2700 JVM_END
2701
2702
2703 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2704 JVMWrapper("JVM_IsSameClassPackage");
2705 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2706 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2707 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2708 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2709 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2710 JVM_END
2711
2712 // Printing support //////////////////////////////////////////////////
2713 extern "C" {
2714
2715 ATTRIBUTE_PRINTF(3, 0)
2716 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2717 // Reject count values that are negative signed values converted to
2718 // unsigned; see bug 4399518, 4417214
2719 if ((intptr_t)count <= 0) return -1;
2720
2721 int result = os::vsnprintf(str, count, fmt, args);
2722 if (result > 0 && (size_t)result >= count) {
2723 result = -1;
2724 }
2725
2726 return result;
2727 }
2728
2729 ATTRIBUTE_PRINTF(3, 4)
2730 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2731 va_list args;
2732 int len;
2733 va_start(args, fmt);
2734 len = jio_vsnprintf(str, count, fmt, args);
2735 va_end(args);
2736 return len;
2737 }
2738
2739 ATTRIBUTE_PRINTF(2, 3)
2740 int jio_fprintf(FILE* f, const char *fmt, ...) {
2741 int len;
2742 va_list args;
2743 va_start(args, fmt);
2744 len = jio_vfprintf(f, fmt, args);
2745 va_end(args);
2746 return len;
2747 }
2748
2749 ATTRIBUTE_PRINTF(2, 0)
2750 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2751 if (Arguments::vfprintf_hook() != NULL) {
2752 return Arguments::vfprintf_hook()(f, fmt, args);
2753 } else {
2754 return vfprintf(f, fmt, args);
2755 }
2756 }
2757
2758 ATTRIBUTE_PRINTF(1, 2)
2759 JNIEXPORT int jio_printf(const char *fmt, ...) {
2760 int len;
2761 va_list args;
2762 va_start(args, fmt);
2763 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2764 va_end(args);
2765 return len;
2766 }
2767
2768
2769 // HotSpot specific jio method
2770 void jio_print(const char* s) {
2771 // Try to make this function as atomic as possible.
2772 if (Arguments::vfprintf_hook() != NULL) {
2773 jio_fprintf(defaultStream::output_stream(), "%s", s);
2774 } else {
2775 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2776 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2777 }
2778 }
2779
2780 } // Extern C
2781
2782 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2783
2784 // In most of the JVM thread support functions we need to access the
2785 // thread through a ThreadsListHandle to prevent it from exiting and
2786 // being reclaimed while we try to operate on it. The exceptions to this
2787 // rule are when operating on the current thread, or if the monitor of
2788 // the target java.lang.Thread is locked at the Java level - in both
2789 // cases the target cannot exit.
2790
2791 static void thread_entry(JavaThread* thread, TRAPS) {
2792 HandleMark hm(THREAD);
2793 Handle obj(THREAD, thread->threadObj());
2794 JavaValue result(T_VOID);
2795 JavaCalls::call_virtual(&result,
2796 obj,
2797 SystemDictionary::Thread_klass(),
2798 vmSymbols::run_method_name(),
2799 vmSymbols::void_method_signature(),
2800 THREAD);
2801 }
2802
2803
2804 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2805 JVMWrapper("JVM_StartThread");
2806 JavaThread *native_thread = NULL;
2807
2808 // We cannot hold the Threads_lock when we throw an exception,
2809 // due to rank ordering issues. Example: we might need to grab the
2810 // Heap_lock while we construct the exception.
2811 bool throw_illegal_thread_state = false;
2812
2813 // We must release the Threads_lock before we can post a jvmti event
2814 // in Thread::start.
2815 {
2816 // Ensure that the C++ Thread and OSThread structures aren't freed before
2817 // we operate.
2818 MutexLocker mu(Threads_lock);
2819
2820 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2821 // re-starting an already started thread, so we should usually find
2822 // that the JavaThread is null. However for a JNI attached thread
2823 // there is a small window between the Thread object being created
2824 // (with its JavaThread set) and the update to its threadStatus, so we
2825 // have to check for this
2826 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2827 throw_illegal_thread_state = true;
2828 } else {
2829 // We could also check the stillborn flag to see if this thread was already stopped, but
2830 // for historical reasons we let the thread detect that itself when it starts running
2831
2832 jlong size =
2833 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2834 // Allocate the C++ Thread structure and create the native thread. The
2835 // stack size retrieved from java is 64-bit signed, but the constructor takes
2836 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2837 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2838 // - Avoid passing negative values which would result in really large stacks.
2839 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2840 size_t sz = size > 0 ? (size_t) size : 0;
2841 native_thread = new JavaThread(&thread_entry, sz);
2842
2843 // At this point it may be possible that no osthread was created for the
2844 // JavaThread due to lack of memory. Check for this situation and throw
2845 // an exception if necessary. Eventually we may want to change this so
2846 // that we only grab the lock if the thread was created successfully -
2847 // then we can also do this check and throw the exception in the
2848 // JavaThread constructor.
2849 if (native_thread->osthread() != NULL) {
2850 // Note: the current thread is not being used within "prepare".
2851 native_thread->prepare(jthread);
2852 }
2853 }
2854 }
2855
2856 if (throw_illegal_thread_state) {
2857 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2858 }
2859
2860 assert(native_thread != NULL, "Starting null thread?");
2861
2862 if (native_thread->osthread() == NULL) {
2863 // No one should hold a reference to the 'native_thread'.
2864 native_thread->smr_delete();
2865 if (JvmtiExport::should_post_resource_exhausted()) {
2866 JvmtiExport::post_resource_exhausted(
2867 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2868 os::native_thread_creation_failed_msg());
2869 }
2870 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2871 os::native_thread_creation_failed_msg());
2872 }
2873
2874 Thread::start(native_thread);
2875
2876 JVM_END
2877
2878
2879 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2880 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2881 // but is thought to be reliable and simple. In the case, where the receiver is the
2882 // same thread as the sender, no VM_Operation is needed.
2883 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2884 JVMWrapper("JVM_StopThread");
2885
2886 // A nested ThreadsListHandle will grab the Threads_lock so create
2887 // tlh before we resolve throwable.
2888 ThreadsListHandle tlh(thread);
2889 oop java_throwable = JNIHandles::resolve(throwable);
2890 if (java_throwable == NULL) {
2891 THROW(vmSymbols::java_lang_NullPointerException());
2892 }
2893 oop java_thread = NULL;
2894 JavaThread* receiver = NULL;
2895 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2896 Events::log_exception(thread,
2897 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2898 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2899
2900 if (is_alive) {
2901 // jthread refers to a live JavaThread.
2902 if (thread == receiver) {
2903 // Exception is getting thrown at self so no VM_Operation needed.
2904 THROW_OOP(java_throwable);
2905 } else {
2906 // Use a VM_Operation to throw the exception.
2907 Thread::send_async_exception(java_thread, java_throwable);
2908 }
2909 } else {
2910 // Either:
2911 // - target thread has not been started before being stopped, or
2912 // - target thread already terminated
2913 // We could read the threadStatus to determine which case it is
2914 // but that is overkill as it doesn't matter. We must set the
2915 // stillborn flag for the first case, and if the thread has already
2916 // exited setting this flag has no effect.
2917 java_lang_Thread::set_stillborn(java_thread);
2918 }
2919 JVM_END
2920
2921
2922 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2923 JVMWrapper("JVM_IsThreadAlive");
2924
2925 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2926 return java_lang_Thread::is_alive(thread_oop);
2927 JVM_END
2928
2929
2930 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2931 JVMWrapper("JVM_SuspendThread");
2932
2933 ThreadsListHandle tlh(thread);
2934 JavaThread* receiver = NULL;
2935 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2936 if (is_alive) {
2937 // jthread refers to a live JavaThread.
2938 {
2939 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2940 if (receiver->is_external_suspend()) {
2941 // Don't allow nested external suspend requests. We can't return
2942 // an error from this interface so just ignore the problem.
2943 return;
2944 }
2945 if (receiver->is_exiting()) { // thread is in the process of exiting
2946 return;
2947 }
2948 receiver->set_external_suspend();
2949 }
2950
2951 // java_suspend() will catch threads in the process of exiting
2952 // and will ignore them.
2953 receiver->java_suspend();
2954
2955 // It would be nice to have the following assertion in all the
2956 // time, but it is possible for a racing resume request to have
2957 // resumed this thread right after we suspended it. Temporarily
2958 // enable this assertion if you are chasing a different kind of
2959 // bug.
2960 //
2961 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2962 // receiver->is_being_ext_suspended(), "thread is not suspended");
2963 }
2964 JVM_END
2965
2966
2967 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2968 JVMWrapper("JVM_ResumeThread");
2969
2970 ThreadsListHandle tlh(thread);
2971 JavaThread* receiver = NULL;
2972 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2973 if (is_alive) {
2974 // jthread refers to a live JavaThread.
2975
2976 // This is the original comment for this Threads_lock grab:
2977 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2978 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2979 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2980 // looks at it.
2981 //
2982 // The above comment dates back to when we had both internal and
2983 // external suspend APIs that shared a common underlying mechanism.
2984 // External suspend is now entirely cooperative and doesn't share
2985 // anything with internal suspend. That said, there are some
2986 // assumptions in the VM that an external resume grabs the
2987 // Threads_lock. We can't drop the Threads_lock grab here until we
2988 // resolve the assumptions that exist elsewhere.
2989 //
2990 MutexLocker ml(Threads_lock);
2991 receiver->java_resume();
2992 }
2993 JVM_END
2994
2995
2996 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2997 JVMWrapper("JVM_SetThreadPriority");
2998
2999 ThreadsListHandle tlh(thread);
3000 oop java_thread = NULL;
3001 JavaThread* receiver = NULL;
3002 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3003 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3004
3005 if (is_alive) {
3006 // jthread refers to a live JavaThread.
3007 Thread::set_priority(receiver, (ThreadPriority)prio);
3008 }
3009 // Implied else: If the JavaThread hasn't started yet, then the
3010 // priority set in the java.lang.Thread object above will be pushed
3011 // down when it does start.
3012 JVM_END
3013
3014
3015 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3016 JVMWrapper("JVM_Yield");
3017 if (os::dont_yield()) return;
3018 HOTSPOT_THREAD_YIELD();
3019 os::naked_yield();
3020 JVM_END
3021
3022
3023 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3024 JVMWrapper("JVM_Sleep");
3025
3026 if (millis < 0) {
3027 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3028 }
3029
3030 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3031 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3032 }
3033
3034 // Save current thread state and restore it at the end of this block.
3035 // And set new thread state to SLEEPING.
3036 JavaThreadSleepState jtss(thread);
3037
3038 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3039
3040 EventThreadSleep event;
3041
3042 if (millis == 0) {
3043 os::naked_yield();
3044 } else {
3045 ThreadState old_state = thread->osthread()->get_state();
3046 thread->osthread()->set_state(SLEEPING);
3047 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3048 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3049 // us while we were sleeping. We do not overwrite those.
3050 if (!HAS_PENDING_EXCEPTION) {
3051 if (event.should_commit()) {
3052 event.set_time(millis);
3053 event.commit();
3054 }
3055 HOTSPOT_THREAD_SLEEP_END(1);
3056
3057 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3058 // to properly restore the thread state. That's likely wrong.
3059 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3060 }
3061 }
3062 thread->osthread()->set_state(old_state);
3063 }
3064 if (event.should_commit()) {
3065 event.set_time(millis);
3066 event.commit();
3067 }
3068 HOTSPOT_THREAD_SLEEP_END(0);
3069 JVM_END
3070
3071 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3072 JVMWrapper("JVM_CurrentThread");
3073 oop jthread = thread->threadObj();
3074 assert (thread != NULL, "no current thread!");
3075 return JNIHandles::make_local(env, jthread);
3076 JVM_END
3077
3078
3079 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3080 JVMWrapper("JVM_CountStackFrames");
3081
3082 uint32_t debug_bits = 0;
3083 ThreadsListHandle tlh(thread);
3084 JavaThread* receiver = NULL;
3085 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3086 int count = 0;
3087 if (is_alive) {
3088 // jthread refers to a live JavaThread.
3089 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
3090 // Count all java activation, i.e., number of vframes.
3091 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) {
3092 // Native frames are not counted.
3093 if (!vfst.method()->is_native()) count++;
3094 }
3095 } else {
3096 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3097 "this thread is not suspended");
3098 }
3099 }
3100 // Implied else: if JavaThread is not alive simply return a count of 0.
3101
3102 return count;
3103 JVM_END
3104
3105
3106 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3107 JVMWrapper("JVM_Interrupt");
3108
3109 ThreadsListHandle tlh(thread);
3110 JavaThread* receiver = NULL;
3111 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3112 if (is_alive) {
3113 // jthread refers to a live JavaThread.
3114 Thread::interrupt(receiver);
3115 }
3116 JVM_END
3117
3118
3119 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3120 JVMWrapper("JVM_IsInterrupted");
3121
3122 ThreadsListHandle tlh(thread);
3123 JavaThread* receiver = NULL;
3124 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3125 if (is_alive) {
3126 // jthread refers to a live JavaThread.
3127 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3128 } else {
3129 return JNI_FALSE;
3130 }
3131 JVM_END
3132
3133
3134 // Return true iff the current thread has locked the object passed in
3135
3136 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3137 JVMWrapper("JVM_HoldsLock");
3138 assert(THREAD->is_Java_thread(), "sanity check");
3139 if (obj == NULL) {
3140 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3141 }
3142 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3143 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3144 JVM_END
3145
3146
3147 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3148 JVMWrapper("JVM_DumpAllStacks");
3149 VM_PrintThreads op;
3150 VMThread::execute(&op);
3151 if (JvmtiExport::should_post_data_dump()) {
3152 JvmtiExport::post_data_dump();
3153 }
3154 JVM_END
3155
3156 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3157 JVMWrapper("JVM_SetNativeThreadName");
3158
3159 // We don't use a ThreadsListHandle here because the current thread
3160 // must be alive.
3161 oop java_thread = JNIHandles::resolve_non_null(jthread);
3162 JavaThread* thr = java_lang_Thread::thread(java_thread);
3163 if (thread == thr && !thr->has_attached_via_jni()) {
3164 // Thread naming is only supported for the current thread and
3165 // we don't set the name of an attached thread to avoid stepping
3166 // on other programs.
3167 ResourceMark rm(thread);
3168 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3169 os::set_native_thread_name(thread_name);
3170 }
3171 JVM_END
3172
3173 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3174
3175 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3176 JVMWrapper("JVM_GetClassContext");
3177 ResourceMark rm(THREAD);
3178 JvmtiVMObjectAllocEventCollector oam;
3179 vframeStream vfst(thread);
3180
3181 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3182 // This must only be called from SecurityManager.getClassContext
3183 Method* m = vfst.method();
3184 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3185 m->name() == vmSymbols::getClassContext_name() &&
3186 m->signature() == vmSymbols::void_class_array_signature())) {
3187 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3188 }
3189 }
3190
3191 // Collect method holders
3192 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3193 for (; !vfst.at_end(); vfst.security_next()) {
3194 Method* m = vfst.method();
3195 // Native frames are not returned
3196 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3197 Klass* holder = m->method_holder();
3198 assert(holder->is_klass(), "just checking");
3199 klass_array->append(holder);
3200 }
3201 }
3202
3203 // Create result array of type [Ljava/lang/Class;
3204 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3205 // Fill in mirrors corresponding to method holders
3206 for (int i = 0; i < klass_array->length(); i++) {
3207 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3208 }
3209
3210 return (jobjectArray) JNIHandles::make_local(env, result);
3211 JVM_END
3212
3213
3214 // java.lang.Package ////////////////////////////////////////////////////////////////
3215
3216
3217 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3218 JVMWrapper("JVM_GetSystemPackage");
3219 ResourceMark rm(THREAD);
3220 JvmtiVMObjectAllocEventCollector oam;
3221 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3222 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3223 return (jstring) JNIHandles::make_local(result);
3224 JVM_END
3225
3226
3227 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3228 JVMWrapper("JVM_GetSystemPackages");
3229 JvmtiVMObjectAllocEventCollector oam;
3230 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3231 return (jobjectArray) JNIHandles::make_local(result);
3232 JVM_END
3233
3234
3235 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3236
3237
3238 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3239 JVMWrapper("JVM_GetAndClearReferencePendingList");
3240
3241 MonitorLockerEx ml(Heap_lock);
3242 oop ref = Universe::reference_pending_list();
3243 if (ref != NULL) {
3244 Universe::set_reference_pending_list(NULL);
3245 }
3246 return JNIHandles::make_local(env, ref);
3247 JVM_END
3248
3249 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3250 JVMWrapper("JVM_HasReferencePendingList");
3251 MonitorLockerEx ml(Heap_lock);
3252 return Universe::has_reference_pending_list();
3253 JVM_END
3254
3255 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3256 JVMWrapper("JVM_WaitForReferencePendingList");
3257 MonitorLockerEx ml(Heap_lock);
3258 while (!Universe::has_reference_pending_list()) {
3259 ml.wait();
3260 }
3261 JVM_END
3262
3263
3264 // ObjectInputStream ///////////////////////////////////////////////////////////////
3265
3266 // Return the first user-defined class loader up the execution stack, or null
3267 // if only code from the bootstrap or platform class loader is on the stack.
3268
3269 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3270 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3271 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3272 oop loader = vfst.method()->method_holder()->class_loader();
3273 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3274 return JNIHandles::make_local(env, loader);
3275 }
3276 }
3277 return NULL;
3278 JVM_END
3279
3280
3281 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3282
3283
3284 // resolve array handle and check arguments
3285 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3286 if (arr == NULL) {
3287 THROW_0(vmSymbols::java_lang_NullPointerException());
3288 }
3289 oop a = JNIHandles::resolve_non_null(arr);
3290 if (!a->is_array()) {
3291 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3292 } else if (type_array_only && !a->is_typeArray()) {
3293 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3294 }
3295 return arrayOop(a);
3296 }
3297
3298
3299 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3300 JVMWrapper("JVM_GetArrayLength");
3301 arrayOop a = check_array(env, arr, false, CHECK_0);
3302 return a->length();
3303 JVM_END
3304
3305
3306 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3307 JVMWrapper("JVM_Array_Get");
3308 JvmtiVMObjectAllocEventCollector oam;
3309 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3310 jvalue value;
3311 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3312 oop box = Reflection::box(&value, type, CHECK_NULL);
3313 return JNIHandles::make_local(env, box);
3314 JVM_END
3315
3316
3317 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3318 JVMWrapper("JVM_GetPrimitiveArrayElement");
3319 jvalue value;
3320 value.i = 0; // to initialize value before getting used in CHECK
3321 arrayOop a = check_array(env, arr, true, CHECK_(value));
3322 assert(a->is_typeArray(), "just checking");
3323 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3324 BasicType wide_type = (BasicType) wCode;
3325 if (type != wide_type) {
3326 Reflection::widen(&value, type, wide_type, CHECK_(value));
3327 }
3328 return value;
3329 JVM_END
3330
3331
3332 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3333 JVMWrapper("JVM_SetArrayElement");
3334 arrayOop a = check_array(env, arr, false, CHECK);
3335 oop box = JNIHandles::resolve(val);
3336 jvalue value;
3337 value.i = 0; // to initialize value before getting used in CHECK
3338 BasicType value_type;
3339 if (a->is_objArray()) {
3340 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3341 value_type = Reflection::unbox_for_regular_object(box, &value);
3342 } else {
3343 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3344 }
3345 Reflection::array_set(&value, a, index, value_type, CHECK);
3346 JVM_END
3347
3348
3349 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3350 JVMWrapper("JVM_SetPrimitiveArrayElement");
3351 arrayOop a = check_array(env, arr, true, CHECK);
3352 assert(a->is_typeArray(), "just checking");
3353 BasicType value_type = (BasicType) vCode;
3354 Reflection::array_set(&v, a, index, value_type, CHECK);
3355 JVM_END
3356
3357
3358 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3359 JVMWrapper("JVM_NewArray");
3360 JvmtiVMObjectAllocEventCollector oam;
3361 oop element_mirror = JNIHandles::resolve(eltClass);
3362 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3363 return JNIHandles::make_local(env, result);
3364 JVM_END
3365
3366
3367 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3368 JVMWrapper("JVM_NewMultiArray");
3369 JvmtiVMObjectAllocEventCollector oam;
3370 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3371 oop element_mirror = JNIHandles::resolve(eltClass);
3372 assert(dim_array->is_typeArray(), "just checking");
3373 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3374 return JNIHandles::make_local(env, result);
3375 JVM_END
3376
3377
3378 // Library support ///////////////////////////////////////////////////////////////////////////
3379
3380 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3381 //%note jvm_ct
3382 JVMWrapper("JVM_LoadLibrary");
3383 char ebuf[1024];
3384 void *load_result;
3385 {
3386 ThreadToNativeFromVM ttnfvm(thread);
3387 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3388 }
3389 if (load_result == NULL) {
3390 char msg[1024];
3391 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3392 // Since 'ebuf' may contain a string encoded using
3393 // platform encoding scheme, we need to pass
3394 // Exceptions::unsafe_to_utf8 to the new_exception method
3395 // as the last argument. See bug 6367357.
3396 Handle h_exception =
3397 Exceptions::new_exception(thread,
3398 vmSymbols::java_lang_UnsatisfiedLinkError(),
3399 msg, Exceptions::unsafe_to_utf8);
3400
3401 THROW_HANDLE_0(h_exception);
3402 }
3403 return load_result;
3404 JVM_END
3405
3406
3407 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3408 JVMWrapper("JVM_UnloadLibrary");
3409 os::dll_unload(handle);
3410 JVM_END
3411
3412
3413 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3414 JVMWrapper("JVM_FindLibraryEntry");
3415 return os::dll_lookup(handle, name);
3416 JVM_END
3417
3418
3419 // JNI version ///////////////////////////////////////////////////////////////////////////////
3420
3421 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3422 JVMWrapper("JVM_IsSupportedJNIVersion");
3423 return Threads::is_supported_jni_version_including_1_1(version);
3424 JVM_END
3425
3426
3427 // String support ///////////////////////////////////////////////////////////////////////////
3428
3429 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3430 JVMWrapper("JVM_InternString");
3431 JvmtiVMObjectAllocEventCollector oam;
3432 if (str == NULL) return NULL;
3433 oop string = JNIHandles::resolve_non_null(str);
3434 oop result = StringTable::intern(string, CHECK_NULL);
3435 return (jstring) JNIHandles::make_local(env, result);
3436 JVM_END
3437
3438
3439 // Raw monitor support //////////////////////////////////////////////////////////////////////
3440
3441 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3442 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3443 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3444 // that only works with java threads.
3445
3446
3447 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3448 VM_Exit::block_if_vm_exited();
3449 JVMWrapper("JVM_RawMonitorCreate");
3450 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3451 }
3452
3453
3454 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3455 VM_Exit::block_if_vm_exited();
3456 JVMWrapper("JVM_RawMonitorDestroy");
3457 delete ((Mutex*) mon);
3458 }
3459
3460
3461 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3462 VM_Exit::block_if_vm_exited();
3463 JVMWrapper("JVM_RawMonitorEnter");
3464 ((Mutex*) mon)->jvm_raw_lock();
3465 return 0;
3466 }
3467
3468
3469 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3470 VM_Exit::block_if_vm_exited();
3471 JVMWrapper("JVM_RawMonitorExit");
3472 ((Mutex*) mon)->jvm_raw_unlock();
3473 }
3474
3475
3476 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3477
3478 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3479 Handle loader, Handle protection_domain,
3480 jboolean throwError, TRAPS) {
3481 // Security Note:
3482 // The Java level wrapper will perform the necessary security check allowing
3483 // us to pass the NULL as the initiating class loader. The VM is responsible for
3484 // the checkPackageAccess relative to the initiating class loader via the
3485 // protection_domain. The protection_domain is passed as NULL by the java code
3486 // if there is no security manager in 3-arg Class.forName().
3487 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3488
3489 // Check if we should initialize the class
3490 if (init && klass->is_instance_klass()) {
3491 klass->initialize(CHECK_NULL);
3492 }
3493 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3494 }
3495
3496
3497 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3498
3499 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3500 JVMWrapper("JVM_InvokeMethod");
3501 Handle method_handle;
3502 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3503 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3504 Handle receiver(THREAD, JNIHandles::resolve(obj));
3505 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3506 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3507 jobject res = JNIHandles::make_local(env, result);
3508 if (JvmtiExport::should_post_vm_object_alloc()) {
3509 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3510 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3511 if (java_lang_Class::is_primitive(ret_type)) {
3512 // Only for primitive type vm allocates memory for java object.
3513 // See box() method.
3514 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3515 }
3516 }
3517 return res;
3518 } else {
3519 THROW_0(vmSymbols::java_lang_StackOverflowError());
3520 }
3521 JVM_END
3522
3523
3524 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3525 JVMWrapper("JVM_NewInstanceFromConstructor");
3526 oop constructor_mirror = JNIHandles::resolve(c);
3527 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3528 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3529 jobject res = JNIHandles::make_local(env, result);
3530 if (JvmtiExport::should_post_vm_object_alloc()) {
3531 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3532 }
3533 return res;
3534 JVM_END
3535
3536 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3537
3538 JVM_LEAF(jboolean, JVM_SupportsCX8())
3539 JVMWrapper("JVM_SupportsCX8");
3540 return VM_Version::supports_cx8();
3541 JVM_END
3542
3543 // Returns an array of all live Thread objects (VM internal JavaThreads,
3544 // jvmti agent threads, and JNI attaching threads are skipped)
3545 // See CR 6404306 regarding JNI attaching threads
3546 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3547 ResourceMark rm(THREAD);
3548 ThreadsListEnumerator tle(THREAD, false, false);
3549 JvmtiVMObjectAllocEventCollector oam;
3550
3551 int num_threads = tle.num_threads();
3552 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3553 objArrayHandle threads_ah(THREAD, r);
3554
3555 for (int i = 0; i < num_threads; i++) {
3556 Handle h = tle.get_threadObj(i);
3557 threads_ah->obj_at_put(i, h());
3558 }
3559
3560 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3561 JVM_END
3562
3563
3564 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3565 // Return StackTraceElement[][], each element is the stack trace of a thread in
3566 // the corresponding entry in the given threads array
3567 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3568 JVMWrapper("JVM_DumpThreads");
3569 JvmtiVMObjectAllocEventCollector oam;
3570
3571 // Check if threads is null
3572 if (threads == NULL) {
3573 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3574 }
3575
3576 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3577 objArrayHandle ah(THREAD, a);
3578 int num_threads = ah->length();
3579 // check if threads is non-empty array
3580 if (num_threads == 0) {
3581 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3582 }
3583
3584 // check if threads is not an array of objects of Thread class
3585 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3586 if (k != SystemDictionary::Thread_klass()) {
3587 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3588 }
3589
3590 ResourceMark rm(THREAD);
3591
3592 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3593 for (int i = 0; i < num_threads; i++) {
3594 oop thread_obj = ah->obj_at(i);
3595 instanceHandle h(THREAD, (instanceOop) thread_obj);
3596 thread_handle_array->append(h);
3597 }
3598
3599 // The JavaThread references in thread_handle_array are validated
3600 // in VM_ThreadDump::doit().
3601 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3602 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3603
3604 JVM_END
3605
3606 // JVM monitoring and management support
3607 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3608 return Management::get_jmm_interface(version);
3609 JVM_END
3610
3611 // com.sun.tools.attach.VirtualMachine agent properties support
3612 //
3613 // Initialize the agent properties with the properties maintained in the VM
3614 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3615 JVMWrapper("JVM_InitAgentProperties");
3616 ResourceMark rm;
3617
3618 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3619
3620 PUTPROP(props, "sun.java.command", Arguments::java_command());
3621 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3622 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3623 return properties;
3624 JVM_END
3625
3626 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3627 {
3628 JVMWrapper("JVM_GetEnclosingMethodInfo");
3629 JvmtiVMObjectAllocEventCollector oam;
3630
3631 if (ofClass == NULL) {
3632 return NULL;
3633 }
3634 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3635 // Special handling for primitive objects
3636 if (java_lang_Class::is_primitive(mirror())) {
3637 return NULL;
3638 }
3639 Klass* k = java_lang_Class::as_Klass(mirror());
3640 if (!k->is_instance_klass()) {
3641 return NULL;
3642 }
3643 InstanceKlass* ik = InstanceKlass::cast(k);
3644 int encl_method_class_idx = ik->enclosing_method_class_index();
3645 if (encl_method_class_idx == 0) {
3646 return NULL;
3647 }
3648 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3649 objArrayHandle dest(THREAD, dest_o);
3650 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3651 dest->obj_at_put(0, enc_k->java_mirror());
3652 int encl_method_method_idx = ik->enclosing_method_method_index();
3653 if (encl_method_method_idx != 0) {
3654 Symbol* sym = ik->constants()->symbol_at(
3655 extract_low_short_from_int(
3656 ik->constants()->name_and_type_at(encl_method_method_idx)));
3657 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3658 dest->obj_at_put(1, str());
3659 sym = ik->constants()->symbol_at(
3660 extract_high_short_from_int(
3661 ik->constants()->name_and_type_at(encl_method_method_idx)));
3662 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3663 dest->obj_at_put(2, str());
3664 }
3665 return (jobjectArray) JNIHandles::make_local(dest());
3666 }
3667 JVM_END
3668
3669 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3670 {
3671 memset(info, 0, info_size);
3672
3673 info->jvm_version = Abstract_VM_Version::jvm_version();
3674 info->patch_version = Abstract_VM_Version::vm_patch_version();
3675
3676 // when we add a new capability in the jvm_version_info struct, we should also
3677 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3678 // counter defined in runtimeService.cpp.
3679 info->is_attach_supported = AttachListener::is_attach_supported();
3680 }
3681 JVM_END
3682
3683 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3684 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3685 ResourceMark rm(THREAD);
3686
3687 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3688 return NULL;
3689 }
3690
3691 char** vm_flags = Arguments::jvm_flags_array();
3692 char** vm_args = Arguments::jvm_args_array();
3693 int num_flags = Arguments::num_jvm_flags();
3694 int num_args = Arguments::num_jvm_args();
3695
3696 InstanceKlass* ik = SystemDictionary::String_klass();
3697 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3698 objArrayHandle result_h(THREAD, r);
3699
3700 int index = 0;
3701 for (int j = 0; j < num_flags; j++, index++) {
3702 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3703 result_h->obj_at_put(index, h());
3704 }
3705 for (int i = 0; i < num_args; i++, index++) {
3706 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3707 result_h->obj_at_put(index, h());
3708 }
3709 return (jobjectArray) JNIHandles::make_local(env, result_h());
3710 JVM_END
3711
3712 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3713 return os::get_signal_number(name);
3714 JVM_END