1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.inline.hpp"
29 #include "classfile/javaAssertions.hpp"
30 #include "classfile/javaClasses.inline.hpp"
31 #include "classfile/moduleEntry.hpp"
32 #include "classfile/modules.hpp"
33 #include "classfile/packageEntry.hpp"
34 #include "classfile/stringTable.hpp"
35 #include "classfile/systemDictionary.hpp"
36 #include "classfile/vmSymbols.hpp"
37 #include "gc/shared/barrierSet.inline.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/fieldStreams.hpp"
44 #include "oops/instanceKlass.hpp"
45 #include "oops/method.hpp"
46 #include "oops/objArrayKlass.hpp"
47 #include "oops/objArrayOop.inline.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "prims/jvm.h"
50 #include "prims/jvm_misc.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "prims/jvmtiThreadState.hpp"
53 #include "prims/nativeLookup.hpp"
54 #include "prims/privilegedStack.hpp"
55 #include "prims/stackwalk.hpp"
56 #include "runtime/arguments.hpp"
57 #include "runtime/atomic.hpp"
58 #include "runtime/handles.inline.hpp"
59 #include "runtime/init.hpp"
60 #include "runtime/interfaceSupport.hpp"
61 #include "runtime/java.hpp"
62 #include "runtime/javaCalls.hpp"
63 #include "runtime/jfieldIDWorkaround.hpp"
64 #include "runtime/orderAccess.inline.hpp"
65 #include "runtime/os.inline.hpp"
66 #include "runtime/perfData.hpp"
67 #include "runtime/reflection.hpp"
68 #include "runtime/thread.inline.hpp"
69 #include "runtime/vframe.hpp"
70 #include "runtime/vm_operations.hpp"
71 #include "runtime/vm_version.hpp"
72 #include "services/attachListener.hpp"
73 #include "services/management.hpp"
74 #include "services/threadService.hpp"
75 #include "trace/tracing.hpp"
76 #include "utilities/copy.hpp"
77 #include "utilities/defaultStream.hpp"
78 #include "utilities/dtrace.hpp"
79 #include "utilities/events.hpp"
80 #include "utilities/histogram.hpp"
81 #include "utilities/macros.hpp"
82 #include "utilities/utf8.hpp"
83 #if INCLUDE_CDS
84 #include "classfile/sharedClassUtil.hpp"
85 #include "classfile/systemDictionaryShared.hpp"
86 #endif
87
88 #include <errno.h>
89
90 /*
91 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
92 such ctors and calls MUST NOT come between an oop declaration/init and its
93 usage because if objects are move this may cause various memory stomps, bus
94 errors and segfaults. Here is a cookbook for causing so called "naked oop
95 failures":
96
97 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
98 JVMWrapper("JVM_GetClassDeclaredFields");
99
100 // Object address to be held directly in mirror & not visible to GC
101 oop mirror = JNIHandles::resolve_non_null(ofClass);
102
103 // If this ctor can hit a safepoint, moving objects around, then
104 ComplexConstructor foo;
105
106 // Boom! mirror may point to JUNK instead of the intended object
107 (some dereference of mirror)
108
109 // Here's another call that may block for GC, making mirror stale
110 MutexLocker ml(some_lock);
111
112 // And here's an initializer that can result in a stale oop
113 // all in one step.
114 oop o = call_that_can_throw_exception(TRAPS);
115
116
117 The solution is to keep the oop declaration BELOW the ctor or function
118 call that might cause a GC, do another resolve to reassign the oop, or
119 consider use of a Handle instead of an oop so there is immunity from object
120 motion. But note that the "QUICK" entries below do not have a handlemark
121 and thus can only support use of handles passed in.
122 */
123
124 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
125 ResourceMark rm;
126 int line_number = -1;
127 const char * source_file = NULL;
128 const char * trace = "explicit";
129 InstanceKlass* caller = NULL;
130 JavaThread* jthread = JavaThread::current();
131 if (jthread->has_last_Java_frame()) {
132 vframeStream vfst(jthread);
133
134 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
135 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
136 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
137 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
138 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
139
140 Method* last_caller = NULL;
141
142 while (!vfst.at_end()) {
143 Method* m = vfst.method();
144 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
145 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
146 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
147 break;
148 }
149 last_caller = m;
150 vfst.next();
151 }
152 // if this is called from Class.forName0 and that is called from Class.forName,
153 // then print the caller of Class.forName. If this is Class.loadClass, then print
154 // that caller, otherwise keep quiet since this should be picked up elsewhere.
155 bool found_it = false;
156 if (!vfst.at_end() &&
157 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
158 vfst.method()->name() == vmSymbols::forName0_name()) {
159 vfst.next();
160 if (!vfst.at_end() &&
161 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
162 vfst.method()->name() == vmSymbols::forName_name()) {
163 vfst.next();
164 found_it = true;
165 }
166 } else if (last_caller != NULL &&
167 last_caller->method_holder()->name() ==
168 vmSymbols::java_lang_ClassLoader() &&
169 (last_caller->name() == vmSymbols::loadClassInternal_name() ||
170 last_caller->name() == vmSymbols::loadClass_name())) {
171 found_it = true;
172 } else if (!vfst.at_end()) {
173 if (vfst.method()->is_native()) {
174 // JNI call
175 found_it = true;
176 }
177 }
178 if (found_it && !vfst.at_end()) {
179 // found the caller
180 caller = vfst.method()->method_holder();
181 line_number = vfst.method()->line_number_from_bci(vfst.bci());
182 if (line_number == -1) {
183 // show method name if it's a native method
184 trace = vfst.method()->name_and_sig_as_C_string();
185 }
186 Symbol* s = caller->source_file_name();
187 if (s != NULL) {
188 source_file = s->as_C_string();
189 }
190 }
191 }
192 if (caller != NULL) {
193 if (to_class != caller) {
194 const char * from = caller->external_name();
195 const char * to = to_class->external_name();
196 // print in a single call to reduce interleaving between threads
197 if (source_file != NULL) {
198 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
199 } else {
200 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
201 }
202 }
203 }
204 }
205
206 void trace_class_resolution(Klass* to_class) {
207 EXCEPTION_MARK;
208 trace_class_resolution_impl(to_class, THREAD);
209 if (HAS_PENDING_EXCEPTION) {
210 CLEAR_PENDING_EXCEPTION;
211 }
212 }
213
214 // Wrapper to trace JVM functions
215
216 #ifdef ASSERT
217 Histogram* JVMHistogram;
218 volatile jint JVMHistogram_lock = 0;
219
220 class JVMHistogramElement : public HistogramElement {
221 public:
222 JVMHistogramElement(const char* name);
223 };
224
225 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
226 _name = elementName;
227 uintx count = 0;
228
229 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
230 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
231 count +=1;
232 if ( (WarnOnStalledSpinLock > 0)
233 && (count % WarnOnStalledSpinLock == 0)) {
234 warning("JVMHistogram_lock seems to be stalled");
235 }
236 }
237 }
238
239 if(JVMHistogram == NULL)
240 JVMHistogram = new Histogram("JVM Call Counts",100);
241
242 JVMHistogram->add_element(this);
243 Atomic::dec(&JVMHistogram_lock);
244 }
245
246 #define JVMCountWrapper(arg) \
247 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
248 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
249
250 #define JVMWrapper(arg) JVMCountWrapper(arg);
251 #else
252 #define JVMWrapper(arg)
253 #endif
254
255
256 // Interface version /////////////////////////////////////////////////////////////////////
257
258
259 JVM_LEAF(jint, JVM_GetInterfaceVersion())
260 return JVM_INTERFACE_VERSION;
261 JVM_END
262
263
264 // java.lang.System //////////////////////////////////////////////////////////////////////
265
266
267 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
268 JVMWrapper("JVM_CurrentTimeMillis");
269 return os::javaTimeMillis();
270 JVM_END
271
272 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
273 JVMWrapper("JVM_NanoTime");
274 return os::javaTimeNanos();
275 JVM_END
276
277 // The function below is actually exposed by jdk.internal.misc.VM and not
278 // java.lang.System, but we choose to keep it here so that it stays next
279 // to JVM_CurrentTimeMillis and JVM_NanoTime
280
281 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
282 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
283
284 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
285 JVMWrapper("JVM_GetNanoTimeAdjustment");
286 jlong seconds;
287 jlong nanos;
288
289 os::javaTimeSystemUTC(seconds, nanos);
290
291 // We're going to verify that the result can fit in a long.
292 // For that we need the difference in seconds between 'seconds'
293 // and 'offset_secs' to be such that:
294 // |seconds - offset_secs| < (2^63/10^9)
295 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
296 // which makes |seconds - offset_secs| < 2^33
297 // and we will prefer +/- 2^32 as the maximum acceptable diff
298 // as 2^32 has a more natural feel than 2^33...
299 //
300 // So if |seconds - offset_secs| >= 2^32 - we return a special
301 // sentinel value (-1) which the caller should take as an
302 // exception value indicating that the offset given to us is
303 // too far from range of the current time - leading to too big
304 // a nano adjustment. The caller is expected to recover by
305 // computing a more accurate offset and calling this method
306 // again. (For the record 2^32 secs is ~136 years, so that
307 // should rarely happen)
308 //
309 jlong diff = seconds - offset_secs;
310 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
311 return -1; // sentinel value: the offset is too far off the target
312 }
313
314 // return the adjustment. If you compute a time by adding
315 // this number of nanoseconds along with the number of seconds
316 // in the offset you should get the current UTC time.
317 return (diff * (jlong)1000000000) + nanos;
318 JVM_END
319
320 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
321 jobject dst, jint dst_pos, jint length))
322 JVMWrapper("JVM_ArrayCopy");
323 // Check if we have null pointers
324 if (src == NULL || dst == NULL) {
325 THROW(vmSymbols::java_lang_NullPointerException());
326 }
327 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
328 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
329 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop");
330 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop");
331 // Do copy
332 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
333 JVM_END
334
335
336 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
337 JavaValue r(T_OBJECT);
338 // public synchronized Object put(Object key, Object value);
339 HandleMark hm(THREAD);
340 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
341 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
342 JavaCalls::call_virtual(&r,
343 props,
344 KlassHandle(THREAD, SystemDictionary::Properties_klass()),
345 vmSymbols::put_name(),
346 vmSymbols::object_object_object_signature(),
347 key_str,
348 value_str,
349 THREAD);
350 }
351
352
353 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
354
355
356 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
357 JVMWrapper("JVM_InitProperties");
358 ResourceMark rm;
359
360 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
361
362 // System property list includes both user set via -D option and
363 // jvm system specific properties.
364 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
365 PUTPROP(props, p->key(), p->value());
366 }
367
368 // Convert the -XX:MaxDirectMemorySize= command line flag
369 // to the sun.nio.MaxDirectMemorySize property.
370 // Do this after setting user properties to prevent people
371 // from setting the value with a -D option, as requested.
372 {
373 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
374 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
375 } else {
376 char as_chars[256];
377 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
378 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
379 }
380 }
381
382 // JVM monitoring and management support
383 // Add the sun.management.compiler property for the compiler's name
384 {
385 #undef CSIZE
386 #if defined(_LP64) || defined(_WIN64)
387 #define CSIZE "64-Bit "
388 #else
389 #define CSIZE
390 #endif // 64bit
391
392 #ifdef TIERED
393 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
394 #else
395 #if defined(COMPILER1)
396 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
397 #elif defined(COMPILER2)
398 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
399 #elif INCLUDE_JVMCI
400 #error "INCLUDE_JVMCI should imply TIERED"
401 #else
402 const char* compiler_name = "";
403 #endif // compilers
404 #endif // TIERED
405
406 if (*compiler_name != '\0' &&
407 (Arguments::mode() != Arguments::_int)) {
408 PUTPROP(props, "sun.management.compiler", compiler_name);
409 }
410 }
411
412 return properties;
413 JVM_END
414
415
416 /*
417 * Return the temporary directory that the VM uses for the attach
418 * and perf data files.
419 *
420 * It is important that this directory is well-known and the
421 * same for all VM instances. It cannot be affected by configuration
422 * variables such as java.io.tmpdir.
423 */
424 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
425 JVMWrapper("JVM_GetTemporaryDirectory");
426 HandleMark hm(THREAD);
427 const char* temp_dir = os::get_temp_directory();
428 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
429 return (jstring) JNIHandles::make_local(env, h());
430 JVM_END
431
432
433 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
434
435 extern volatile jint vm_created;
436
437 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
438 before_exit(thread);
439 vm_exit(code);
440 JVM_END
441
442
443 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
444 JVMWrapper("JVM_GC");
445 if (!DisableExplicitGC) {
446 Universe::heap()->collect(GCCause::_java_lang_system_gc);
447 }
448 JVM_END
449
450
451 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
452 JVMWrapper("JVM_MaxObjectInspectionAge");
453 return Universe::heap()->millis_since_last_gc();
454 JVM_END
455
456
457 static inline jlong convert_size_t_to_jlong(size_t val) {
458 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
459 NOT_LP64 (return (jlong)val;)
460 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
461 }
462
463 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
464 JVMWrapper("JVM_TotalMemory");
465 size_t n = Universe::heap()->capacity();
466 return convert_size_t_to_jlong(n);
467 JVM_END
468
469
470 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
471 JVMWrapper("JVM_FreeMemory");
472 CollectedHeap* ch = Universe::heap();
473 size_t n;
474 {
475 MutexLocker x(Heap_lock);
476 n = ch->capacity() - ch->used();
477 }
478 return convert_size_t_to_jlong(n);
479 JVM_END
480
481
482 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
483 JVMWrapper("JVM_MaxMemory");
484 size_t n = Universe::heap()->max_capacity();
485 return convert_size_t_to_jlong(n);
486 JVM_END
487
488
489 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
490 JVMWrapper("JVM_ActiveProcessorCount");
491 return os::active_processor_count();
492 JVM_END
493
494
495
496 // java.lang.Throwable //////////////////////////////////////////////////////
497
498
499 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
500 JVMWrapper("JVM_FillInStackTrace");
501 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
502 java_lang_Throwable::fill_in_stack_trace(exception);
503 JVM_END
504
505
506 // java.lang.StackTraceElement //////////////////////////////////////////////
507
508
509 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
510 JVMWrapper("JVM_InitStackTraceElementArray");
511 Handle exception(THREAD, JNIHandles::resolve(throwable));
512 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
513 objArrayHandle stack_trace(THREAD, st);
514 // Fill in the allocated stack trace
515 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
516 JVM_END
517
518
519 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
520 JVMWrapper("JVM_InitStackTraceElement");
521 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
522 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
523 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
524 JVM_END
525
526
527 // java.lang.StackWalker //////////////////////////////////////////////////////
528
529
530 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
531 jint skip_frames, jint frame_count, jint start_index,
532 jobjectArray frames))
533 JVMWrapper("JVM_CallStackWalk");
534 JavaThread* jt = (JavaThread*) THREAD;
535 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
536 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
537 }
538
539 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
540
541 // frames array is a Class<?>[] array when only getting caller reference,
542 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
543 // be null.
544 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
545 objArrayHandle frames_array_h(THREAD, fa);
546
547 int limit = start_index + frame_count;
548 if (frames_array_h->length() < limit) {
549 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
550 }
551
552 Handle result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
553 start_index, frames_array_h, CHECK_NULL);
554 return JNIHandles::make_local(env, result());
555 JVM_END
556
557
558 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
559 jint frame_count, jint start_index,
560 jobjectArray frames))
561 JVMWrapper("JVM_MoreStackWalk");
562 JavaThread* jt = (JavaThread*) THREAD;
563
564 // frames array is a Class<?>[] array when only getting caller reference,
565 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
566 // be null.
567 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
568 objArrayHandle frames_array_h(THREAD, fa);
569
570 int limit = start_index+frame_count;
571 if (frames_array_h->length() < limit) {
572 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
573 }
574
575 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
576 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
577 start_index, frames_array_h, THREAD);
578 JVM_END
579
580 // java.lang.Object ///////////////////////////////////////////////
581
582
583 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
584 JVMWrapper("JVM_IHashCode");
585 // as implemented in the classic virtual machine; return 0 if object is NULL
586 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
587 JVM_END
588
589
590 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
591 JVMWrapper("JVM_MonitorWait");
592 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
593 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
594 if (JvmtiExport::should_post_monitor_wait()) {
595 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
596
597 // The current thread already owns the monitor and it has not yet
598 // been added to the wait queue so the current thread cannot be
599 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
600 // event handler cannot accidentally consume an unpark() meant for
601 // the ParkEvent associated with this ObjectMonitor.
602 }
603 ObjectSynchronizer::wait(obj, ms, CHECK);
604 JVM_END
605
606
607 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
608 JVMWrapper("JVM_MonitorNotify");
609 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
610 ObjectSynchronizer::notify(obj, CHECK);
611 JVM_END
612
613
614 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
615 JVMWrapper("JVM_MonitorNotifyAll");
616 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
617 ObjectSynchronizer::notifyall(obj, CHECK);
618 JVM_END
619
620
621 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
622 JVMWrapper("JVM_Clone");
623 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
624 const KlassHandle klass (THREAD, obj->klass());
625 JvmtiVMObjectAllocEventCollector oam;
626
627 #ifdef ASSERT
628 // Just checking that the cloneable flag is set correct
629 if (obj->is_array()) {
630 guarantee(klass->is_cloneable(), "all arrays are cloneable");
631 } else {
632 guarantee(obj->is_instance(), "should be instanceOop");
633 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
634 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
635 }
636 #endif
637
638 // Check if class of obj supports the Cloneable interface.
639 // All arrays are considered to be cloneable (See JLS 20.1.5)
640 if (!klass->is_cloneable()) {
641 ResourceMark rm(THREAD);
642 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
643 }
644
645 // Make shallow object copy
646 const int size = obj->size();
647 oop new_obj_oop = NULL;
648 if (obj->is_array()) {
649 const int length = ((arrayOop)obj())->length();
650 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
651 } else {
652 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
653 }
654
655 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
656 // is modifying a reference field in the clonee, a non-oop-atomic copy might
657 // be suspended in the middle of copying the pointer and end up with parts
658 // of two different pointers in the field. Subsequent dereferences will crash.
659 // 4846409: an oop-copy of objects with long or double fields or arrays of same
660 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
661 // of oops. We know objects are aligned on a minimum of an jlong boundary.
662 // The same is true of StubRoutines::object_copy and the various oop_copy
663 // variants, and of the code generated by the inline_native_clone intrinsic.
664 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
665 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop,
666 (size_t)align_object_size(size) / HeapWordsPerLong);
667 // Clear the header
668 new_obj_oop->init_mark();
669
670 // Store check (mark entire object and let gc sort it out)
671 BarrierSet* bs = Universe::heap()->barrier_set();
672 assert(bs->has_write_region_opt(), "Barrier set does not have write_region");
673 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size));
674
675 Handle new_obj(THREAD, new_obj_oop);
676 // Special handling for MemberNames. Since they contain Method* metadata, they
677 // must be registered so that RedefineClasses can fix metadata contained in them.
678 if (java_lang_invoke_MemberName::is_instance(new_obj()) &&
679 java_lang_invoke_MemberName::is_method(new_obj())) {
680 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj());
681 // MemberName may be unresolved, so doesn't need registration until resolved.
682 if (method != NULL) {
683 methodHandle m(THREAD, method);
684 // This can safepoint and redefine method, so need both new_obj and method
685 // in a handle, for two different reasons. new_obj can move, method can be
686 // deleted if nothing is using it on the stack.
687 m->method_holder()->add_member_name(new_obj(), false);
688 }
689 }
690
691 // Caution: this involves a java upcall, so the clone should be
692 // "gc-robust" by this stage.
693 if (klass->has_finalizer()) {
694 assert(obj->is_instance(), "should be instanceOop");
695 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
696 new_obj = Handle(THREAD, new_obj_oop);
697 }
698
699 return JNIHandles::make_local(env, new_obj());
700 JVM_END
701
702 // java.io.File ///////////////////////////////////////////////////////////////
703
704 JVM_LEAF(char*, JVM_NativePath(char* path))
705 JVMWrapper("JVM_NativePath");
706 return os::native_path(path);
707 JVM_END
708
709
710 // Misc. class handling ///////////////////////////////////////////////////////////
711
712
713 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
714 JVMWrapper("JVM_GetCallerClass");
715
716 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
717 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
718 // temporarily for existing code to use until a replacement API is defined.
719 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
720 Klass* k = thread->security_get_caller_class(depth);
721 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
722 }
723
724 // Getting the class of the caller frame.
725 //
726 // The call stack at this point looks something like this:
727 //
728 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
729 // [1] [ @CallerSensitive API.method ]
730 // [.] [ (skipped intermediate frames) ]
731 // [n] [ caller ]
732 vframeStream vfst(thread);
733 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
734 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
735 Method* m = vfst.method();
736 assert(m != NULL, "sanity");
737 switch (n) {
738 case 0:
739 // This must only be called from Reflection.getCallerClass
740 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
741 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
742 }
743 // fall-through
744 case 1:
745 // Frame 0 and 1 must be caller sensitive.
746 if (!m->caller_sensitive()) {
747 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
748 }
749 break;
750 default:
751 if (!m->is_ignored_by_security_stack_walk()) {
752 // We have reached the desired frame; return the holder class.
753 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
754 }
755 break;
756 }
757 }
758 return NULL;
759 JVM_END
760
761
762 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
763 JVMWrapper("JVM_FindPrimitiveClass");
764 oop mirror = NULL;
765 BasicType t = name2type(utf);
766 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
767 mirror = Universe::java_mirror(t);
768 }
769 if (mirror == NULL) {
770 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
771 } else {
772 return (jclass) JNIHandles::make_local(env, mirror);
773 }
774 JVM_END
775
776
777 // Returns a class loaded by the bootstrap class loader; or null
778 // if not found. ClassNotFoundException is not thrown.
779 // FindClassFromBootLoader is exported to the launcher for windows.
780 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
781 const char* name))
782 JVMWrapper("JVM_FindClassFromBootLoader");
783
784 // Java libraries should ensure that name is never null...
785 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
786 // It's impossible to create this class; the name cannot fit
787 // into the constant pool.
788 return NULL;
789 }
790
791 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
792 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
793 if (k == NULL) {
794 return NULL;
795 }
796
797 if (log_is_enabled(Debug, class, resolve)) {
798 trace_class_resolution(k);
799 }
800 return (jclass) JNIHandles::make_local(env, k->java_mirror());
801 JVM_END
802
803 // Find a class with this name in this loader, using the caller's protection domain.
804 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
805 jboolean init, jobject loader,
806 jclass caller))
807 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
808 // Java libraries should ensure that name is never null...
809 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
810 // It's impossible to create this class; the name cannot fit
811 // into the constant pool.
812 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
813 }
814
815 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
816
817 oop loader_oop = JNIHandles::resolve(loader);
818 oop from_class = JNIHandles::resolve(caller);
819 oop protection_domain = NULL;
820 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
821 // NPE. Put it in another way, the bootstrap class loader has all permission and
822 // thus no checkPackageAccess equivalence in the VM class loader.
823 // The caller is also passed as NULL by the java code if there is no security
824 // manager to avoid the performance cost of getting the calling class.
825 if (from_class != NULL && loader_oop != NULL) {
826 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
827 }
828
829 Handle h_loader(THREAD, loader_oop);
830 Handle h_prot(THREAD, protection_domain);
831 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
832 h_prot, false, THREAD);
833
834 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
835 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
836 }
837 return result;
838 JVM_END
839
840 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
841 jboolean init, jclass from))
842 JVMWrapper("JVM_FindClassFromClass");
843 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
844 // It's impossible to create this class; the name cannot fit
845 // into the constant pool.
846 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
847 }
848 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
849 oop from_class_oop = JNIHandles::resolve(from);
850 Klass* from_class = (from_class_oop == NULL)
851 ? (Klass*)NULL
852 : java_lang_Class::as_Klass(from_class_oop);
853 oop class_loader = NULL;
854 oop protection_domain = NULL;
855 if (from_class != NULL) {
856 class_loader = from_class->class_loader();
857 protection_domain = from_class->protection_domain();
858 }
859 Handle h_loader(THREAD, class_loader);
860 Handle h_prot (THREAD, protection_domain);
861 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
862 h_prot, true, thread);
863
864 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
865 // this function is generally only used for class loading during verification.
866 ResourceMark rm;
867 oop from_mirror = JNIHandles::resolve_non_null(from);
868 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
869 const char * from_name = from_class->external_name();
870
871 oop mirror = JNIHandles::resolve_non_null(result);
872 Klass* to_class = java_lang_Class::as_Klass(mirror);
873 const char * to = to_class->external_name();
874 log_debug(class, resolve)("%s %s (verification)", from_name, to);
875 }
876
877 return result;
878 JVM_END
879
880 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
881 if (loader.is_null()) {
882 return;
883 }
884
885 // check whether the current caller thread holds the lock or not.
886 // If not, increment the corresponding counter
887 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
888 ObjectSynchronizer::owner_self) {
889 counter->inc();
890 }
891 }
892
893 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
894 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
895 jobject loader, const jbyte *buf,
896 jsize len, jobject pd, const char *source,
897 TRAPS) {
898 if (source == NULL) source = "__JVM_DefineClass__";
899
900 assert(THREAD->is_Java_thread(), "must be a JavaThread");
901 JavaThread* jt = (JavaThread*) THREAD;
902
903 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
904 ClassLoader::perf_define_appclass_selftime(),
905 ClassLoader::perf_define_appclasses(),
906 jt->get_thread_stat()->perf_recursion_counts_addr(),
907 jt->get_thread_stat()->perf_timers_addr(),
908 PerfClassTraceTime::DEFINE_CLASS);
909
910 if (UsePerfData) {
911 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
912 }
913
914 // Since exceptions can be thrown, class initialization can take place
915 // if name is NULL no check for class name in .class stream has to be made.
916 TempNewSymbol class_name = NULL;
917 if (name != NULL) {
918 const int str_len = (int)strlen(name);
919 if (str_len > Symbol::max_length()) {
920 // It's impossible to create this class; the name cannot fit
921 // into the constant pool.
922 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
923 }
924 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
925 }
926
927 ResourceMark rm(THREAD);
928 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
929 Handle class_loader (THREAD, JNIHandles::resolve(loader));
930 if (UsePerfData) {
931 is_lock_held_by_thread(class_loader,
932 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
933 THREAD);
934 }
935 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
936 Klass* k = SystemDictionary::resolve_from_stream(class_name,
937 class_loader,
938 protection_domain,
939 &st,
940 CHECK_NULL);
941
942 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
943 trace_class_resolution(k);
944 }
945
946 return (jclass) JNIHandles::make_local(env, k->java_mirror());
947 }
948
949
950 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
951 JVMWrapper("JVM_DefineClass");
952
953 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
954 JVM_END
955
956
957 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
958 JVMWrapper("JVM_DefineClassWithSource");
959
960 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
961 JVM_END
962
963 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
964 JVMWrapper("JVM_FindLoadedClass");
965 ResourceMark rm(THREAD);
966
967 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
968 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
969
970 const char* str = java_lang_String::as_utf8_string(string());
971 // Sanity check, don't expect null
972 if (str == NULL) return NULL;
973
974 const int str_len = (int)strlen(str);
975 if (str_len > Symbol::max_length()) {
976 // It's impossible to create this class; the name cannot fit
977 // into the constant pool.
978 return NULL;
979 }
980 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
981
982 // Security Note:
983 // The Java level wrapper will perform the necessary security check allowing
984 // us to pass the NULL as the initiating class loader.
985 Handle h_loader(THREAD, JNIHandles::resolve(loader));
986 if (UsePerfData) {
987 is_lock_held_by_thread(h_loader,
988 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
989 THREAD);
990 }
991
992 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
993 h_loader,
994 Handle(),
995 CHECK_NULL);
996 #if INCLUDE_CDS
997 if (k == NULL) {
998 // If the class is not already loaded, try to see if it's in the shared
999 // archive for the current classloader (h_loader).
1000 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
1001 klass_name, h_loader, CHECK_NULL);
1002 k = ik();
1003 }
1004 #endif
1005 return (k == NULL) ? NULL :
1006 (jclass) JNIHandles::make_local(env, k->java_mirror());
1007 JVM_END
1008
1009 // Module support //////////////////////////////////////////////////////////////////////////////
1010
1011 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1012 jstring location, const char* const* packages, jsize num_packages))
1013 JVMWrapper("JVM_DefineModule");
1014 Modules::define_module(module, version, location, packages, num_packages, CHECK);
1015 JVM_END
1016
1017 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1018 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1019 Modules::set_bootloader_unnamed_module(module, CHECK);
1020 JVM_END
1021
1022 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1023 JVMWrapper("JVM_AddModuleExports");
1024 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1025 JVM_END
1026
1027 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1028 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1029 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1030 JVM_END
1031
1032 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1033 JVMWrapper("JVM_AddModuleExportsToAll");
1034 Modules::add_module_exports(from_module, package, NULL, CHECK);
1035 JVM_END
1036
1037 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1038 JVMWrapper("JVM_AddReadsModule");
1039 Modules::add_reads_module(from_module, source_module, CHECK);
1040 JVM_END
1041
1042 JVM_ENTRY (void, JVM_AddModulePackage(JNIEnv *env, jobject module, const char* package))
1043 JVMWrapper("JVM_AddModulePackage");
1044 Modules::add_module_package(module, package, CHECK);
1045 JVM_END
1046
1047 // Reflection support //////////////////////////////////////////////////////////////////////////////
1048
1049 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1050 assert (cls != NULL, "illegal class");
1051 JVMWrapper("JVM_GetClassName");
1052 JvmtiVMObjectAllocEventCollector oam;
1053 ResourceMark rm(THREAD);
1054 const char* name;
1055 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1056 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1057 } else {
1058 // Consider caching interned string in Klass
1059 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1060 assert(k->is_klass(), "just checking");
1061 name = k->external_name();
1062 }
1063 oop result = StringTable::intern((char*) name, CHECK_NULL);
1064 return (jstring) JNIHandles::make_local(env, result);
1065 JVM_END
1066
1067
1068 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1069 JVMWrapper("JVM_GetClassInterfaces");
1070 JvmtiVMObjectAllocEventCollector oam;
1071 oop mirror = JNIHandles::resolve_non_null(cls);
1072
1073 // Special handling for primitive objects
1074 if (java_lang_Class::is_primitive(mirror)) {
1075 // Primitive objects does not have any interfaces
1076 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1077 return (jobjectArray) JNIHandles::make_local(env, r);
1078 }
1079
1080 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
1081 // Figure size of result array
1082 int size;
1083 if (klass->is_instance_klass()) {
1084 size = InstanceKlass::cast(klass())->local_interfaces()->length();
1085 } else {
1086 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1087 size = 2;
1088 }
1089
1090 // Allocate result array
1091 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1092 objArrayHandle result (THREAD, r);
1093 // Fill in result
1094 if (klass->is_instance_klass()) {
1095 // Regular instance klass, fill in all local interfaces
1096 for (int index = 0; index < size; index++) {
1097 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
1098 result->obj_at_put(index, k->java_mirror());
1099 }
1100 } else {
1101 // All arrays implement java.lang.Cloneable and java.io.Serializable
1102 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1103 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1104 }
1105 return (jobjectArray) JNIHandles::make_local(env, result());
1106 JVM_END
1107
1108
1109 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1110 JVMWrapper("JVM_IsInterface");
1111 oop mirror = JNIHandles::resolve_non_null(cls);
1112 if (java_lang_Class::is_primitive(mirror)) {
1113 return JNI_FALSE;
1114 }
1115 Klass* k = java_lang_Class::as_Klass(mirror);
1116 jboolean result = k->is_interface();
1117 assert(!result || k->is_instance_klass(),
1118 "all interfaces are instance types");
1119 // The compiler intrinsic for isInterface tests the
1120 // Klass::_access_flags bits in the same way.
1121 return result;
1122 JVM_END
1123
1124
1125 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1126 JVMWrapper("JVM_GetClassSigners");
1127 JvmtiVMObjectAllocEventCollector oam;
1128 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1129 // There are no signers for primitive types
1130 return NULL;
1131 }
1132
1133 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1134
1135 // If there are no signers set in the class, or if the class
1136 // is an array, return NULL.
1137 if (signers == NULL) return NULL;
1138
1139 // copy of the signers array
1140 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1141 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1142 for (int index = 0; index < signers->length(); index++) {
1143 signers_copy->obj_at_put(index, signers->obj_at(index));
1144 }
1145
1146 // return the copy
1147 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1148 JVM_END
1149
1150
1151 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1152 JVMWrapper("JVM_SetClassSigners");
1153 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1154 // This call is ignored for primitive types and arrays.
1155 // Signers are only set once, ClassLoader.java, and thus shouldn't
1156 // be called with an array. Only the bootstrap loader creates arrays.
1157 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1158 if (k->is_instance_klass()) {
1159 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1160 }
1161 }
1162 JVM_END
1163
1164
1165 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1166 JVMWrapper("JVM_GetProtectionDomain");
1167 if (JNIHandles::resolve(cls) == NULL) {
1168 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1169 }
1170
1171 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1172 // Primitive types does not have a protection domain.
1173 return NULL;
1174 }
1175
1176 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1177 return (jobject) JNIHandles::make_local(env, pd);
1178 JVM_END
1179
1180
1181 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1182 // If there is a security manager and protection domain, check the access
1183 // in the protection domain, otherwise it is authorized.
1184 if (java_lang_System::has_security_manager()) {
1185
1186 // For bootstrapping, if pd implies method isn't in the JDK, allow
1187 // this context to revert to older behavior.
1188 // In this case the isAuthorized field in AccessControlContext is also not
1189 // present.
1190 if (Universe::protection_domain_implies_method() == NULL) {
1191 return true;
1192 }
1193
1194 // Whitelist certain access control contexts
1195 if (java_security_AccessControlContext::is_authorized(context)) {
1196 return true;
1197 }
1198
1199 oop prot = klass->protection_domain();
1200 if (prot != NULL) {
1201 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1202 // in the new wrapper.
1203 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1204 Handle h_prot(THREAD, prot);
1205 JavaValue result(T_BOOLEAN);
1206 JavaCallArguments args(h_prot);
1207 JavaCalls::call(&result, m, &args, CHECK_false);
1208 return (result.get_jboolean() != 0);
1209 }
1210 }
1211 return true;
1212 }
1213
1214 // Create an AccessControlContext with a protection domain with null codesource
1215 // and null permissions - which gives no permissions.
1216 oop create_dummy_access_control_context(TRAPS) {
1217 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1218 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1219 // Call constructor ProtectionDomain(null, null);
1220 JavaValue result(T_VOID);
1221 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1222 vmSymbols::object_initializer_name(),
1223 vmSymbols::codesource_permissioncollection_signature(),
1224 Handle(), Handle(), CHECK_NULL);
1225
1226 // new ProtectionDomain[] {pd};
1227 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1228 context->obj_at_put(0, obj());
1229
1230 // new AccessControlContext(new ProtectionDomain[] {pd})
1231 objArrayHandle h_context(THREAD, context);
1232 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1233 return acc;
1234 }
1235
1236 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1237 JVMWrapper("JVM_DoPrivileged");
1238
1239 if (action == NULL) {
1240 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1241 }
1242
1243 // Compute the frame initiating the do privileged operation and setup the privileged stack
1244 vframeStream vfst(thread);
1245 vfst.security_get_caller_frame(1);
1246
1247 if (vfst.at_end()) {
1248 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1249 }
1250
1251 Method* method = vfst.method();
1252 instanceKlassHandle klass (THREAD, method->method_holder());
1253
1254 // Check that action object understands "Object run()"
1255 Handle h_context;
1256 if (context != NULL) {
1257 h_context = Handle(THREAD, JNIHandles::resolve(context));
1258 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1259 if (!authorized) {
1260 // Create an unprivileged access control object and call it's run function
1261 // instead.
1262 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1263 h_context = Handle(THREAD, noprivs);
1264 }
1265 }
1266
1267 // Check that action object understands "Object run()"
1268 Handle object (THREAD, JNIHandles::resolve(action));
1269
1270 // get run() method
1271 Method* m_oop = object->klass()->uncached_lookup_method(
1272 vmSymbols::run_method_name(),
1273 vmSymbols::void_object_signature(),
1274 Klass::find_overpass);
1275 methodHandle m (THREAD, m_oop);
1276 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1277 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1278 }
1279
1280 // Stack allocated list of privileged stack elements
1281 PrivilegedElement pi;
1282 if (!vfst.at_end()) {
1283 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1284 thread->set_privileged_stack_top(&pi);
1285 }
1286
1287
1288 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1289 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1290 Handle pending_exception;
1291 JavaValue result(T_OBJECT);
1292 JavaCallArguments args(object);
1293 JavaCalls::call(&result, m, &args, THREAD);
1294
1295 // done with action, remove ourselves from the list
1296 if (!vfst.at_end()) {
1297 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1298 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1299 }
1300
1301 if (HAS_PENDING_EXCEPTION) {
1302 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1303 CLEAR_PENDING_EXCEPTION;
1304 // JVMTI has already reported the pending exception
1305 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1306 if (THREAD->is_Java_thread()) {
1307 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1308 }
1309 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1310 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1311 // Throw a java.security.PrivilegedActionException(Exception e) exception
1312 JavaCallArguments args(pending_exception);
1313 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1314 vmSymbols::exception_void_signature(),
1315 &args);
1316 }
1317 }
1318
1319 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1320 return JNIHandles::make_local(env, (oop) result.get_jobject());
1321 JVM_END
1322
1323
1324 // Returns the inherited_access_control_context field of the running thread.
1325 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1326 JVMWrapper("JVM_GetInheritedAccessControlContext");
1327 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1328 return JNIHandles::make_local(env, result);
1329 JVM_END
1330
1331 class RegisterArrayForGC {
1332 private:
1333 JavaThread *_thread;
1334 public:
1335 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1336 _thread = thread;
1337 _thread->register_array_for_gc(array);
1338 }
1339
1340 ~RegisterArrayForGC() {
1341 _thread->register_array_for_gc(NULL);
1342 }
1343 };
1344
1345
1346 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1347 JVMWrapper("JVM_GetStackAccessControlContext");
1348 if (!UsePrivilegedStack) return NULL;
1349
1350 ResourceMark rm(THREAD);
1351 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1352 JvmtiVMObjectAllocEventCollector oam;
1353
1354 // count the protection domains on the execution stack. We collapse
1355 // duplicate consecutive protection domains into a single one, as
1356 // well as stopping when we hit a privileged frame.
1357
1358 // Use vframeStream to iterate through Java frames
1359 vframeStream vfst(thread);
1360
1361 oop previous_protection_domain = NULL;
1362 Handle privileged_context(thread, NULL);
1363 bool is_privileged = false;
1364 oop protection_domain = NULL;
1365
1366 for(; !vfst.at_end(); vfst.next()) {
1367 // get method of frame
1368 Method* method = vfst.method();
1369 intptr_t* frame_id = vfst.frame_id();
1370
1371 // check the privileged frames to see if we have a match
1372 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1373 // this frame is privileged
1374 is_privileged = true;
1375 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1376 protection_domain = thread->privileged_stack_top()->protection_domain();
1377 } else {
1378 protection_domain = method->method_holder()->protection_domain();
1379 }
1380
1381 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1382 local_array->push(protection_domain);
1383 previous_protection_domain = protection_domain;
1384 }
1385
1386 if (is_privileged) break;
1387 }
1388
1389
1390 // either all the domains on the stack were system domains, or
1391 // we had a privileged system domain
1392 if (local_array->is_empty()) {
1393 if (is_privileged && privileged_context.is_null()) return NULL;
1394
1395 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1396 return JNIHandles::make_local(env, result);
1397 }
1398
1399 // the resource area must be registered in case of a gc
1400 RegisterArrayForGC ragc(thread, local_array);
1401 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1402 local_array->length(), CHECK_NULL);
1403 objArrayHandle h_context(thread, context);
1404 for (int index = 0; index < local_array->length(); index++) {
1405 h_context->obj_at_put(index, local_array->at(index));
1406 }
1407
1408 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1409
1410 return JNIHandles::make_local(env, result);
1411 JVM_END
1412
1413
1414 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1415 JVMWrapper("JVM_IsArrayClass");
1416 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1417 return (k != NULL) && k->is_array_klass() ? true : false;
1418 JVM_END
1419
1420
1421 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1422 JVMWrapper("JVM_IsPrimitiveClass");
1423 oop mirror = JNIHandles::resolve_non_null(cls);
1424 return (jboolean) java_lang_Class::is_primitive(mirror);
1425 JVM_END
1426
1427
1428 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1429 JVMWrapper("JVM_GetClassModifiers");
1430 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1431 // Primitive type
1432 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1433 }
1434
1435 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1436 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1437 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1438 return k->modifier_flags();
1439 JVM_END
1440
1441
1442 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1443
1444 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1445 JvmtiVMObjectAllocEventCollector oam;
1446 // ofClass is a reference to a java_lang_Class object. The mirror object
1447 // of an InstanceKlass
1448
1449 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1450 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1451 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1452 return (jobjectArray)JNIHandles::make_local(env, result);
1453 }
1454
1455 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1456 InnerClassesIterator iter(k);
1457
1458 if (iter.length() == 0) {
1459 // Neither an inner nor outer class
1460 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1461 return (jobjectArray)JNIHandles::make_local(env, result);
1462 }
1463
1464 // find inner class info
1465 constantPoolHandle cp(thread, k->constants());
1466 int length = iter.length();
1467
1468 // Allocate temp. result array
1469 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1470 objArrayHandle result (THREAD, r);
1471 int members = 0;
1472
1473 for (; !iter.done(); iter.next()) {
1474 int ioff = iter.inner_class_info_index();
1475 int ooff = iter.outer_class_info_index();
1476
1477 if (ioff != 0 && ooff != 0) {
1478 // Check to see if the name matches the class we're looking for
1479 // before attempting to find the class.
1480 if (cp->klass_name_at_matches(k, ooff)) {
1481 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1482 if (outer_klass == k()) {
1483 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1484 instanceKlassHandle inner_klass (THREAD, ik);
1485
1486 // Throws an exception if outer klass has not declared k as
1487 // an inner klass
1488 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1489
1490 result->obj_at_put(members, inner_klass->java_mirror());
1491 members++;
1492 }
1493 }
1494 }
1495 }
1496
1497 if (members != length) {
1498 // Return array of right length
1499 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1500 for(int i = 0; i < members; i++) {
1501 res->obj_at_put(i, result->obj_at(i));
1502 }
1503 return (jobjectArray)JNIHandles::make_local(env, res);
1504 }
1505
1506 return (jobjectArray)JNIHandles::make_local(env, result());
1507 JVM_END
1508
1509
1510 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1511 {
1512 // ofClass is a reference to a java_lang_Class object.
1513 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1514 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1515 return NULL;
1516 }
1517
1518 bool inner_is_member = false;
1519 Klass* outer_klass
1520 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1521 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1522 if (outer_klass == NULL) return NULL; // already a top-level class
1523 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1524 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1525 }
1526 JVM_END
1527
1528 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1529 {
1530 oop mirror = JNIHandles::resolve_non_null(cls);
1531 if (java_lang_Class::is_primitive(mirror) ||
1532 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1533 return NULL;
1534 }
1535 instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror)));
1536 int ooff = 0, noff = 0;
1537 if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) {
1538 if (noff != 0) {
1539 constantPoolHandle i_cp(thread, k->constants());
1540 Symbol* name = i_cp->symbol_at(noff);
1541 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1542 return (jstring) JNIHandles::make_local(env, str());
1543 }
1544 }
1545 return NULL;
1546 }
1547 JVM_END
1548
1549 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1550 assert (cls != NULL, "illegal class");
1551 JVMWrapper("JVM_GetClassSignature");
1552 JvmtiVMObjectAllocEventCollector oam;
1553 ResourceMark rm(THREAD);
1554 // Return null for arrays and primatives
1555 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1556 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1557 if (k->is_instance_klass()) {
1558 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1559 if (sym == NULL) return NULL;
1560 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1561 return (jstring) JNIHandles::make_local(env, str());
1562 }
1563 }
1564 return NULL;
1565 JVM_END
1566
1567
1568 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1569 assert (cls != NULL, "illegal class");
1570 JVMWrapper("JVM_GetClassAnnotations");
1571
1572 // Return null for arrays and primitives
1573 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1574 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1575 if (k->is_instance_klass()) {
1576 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1577 return (jbyteArray) JNIHandles::make_local(env, a);
1578 }
1579 }
1580 return NULL;
1581 JVM_END
1582
1583
1584 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1585 // some of this code was adapted from from jni_FromReflectedField
1586
1587 oop reflected = JNIHandles::resolve_non_null(field);
1588 oop mirror = java_lang_reflect_Field::clazz(reflected);
1589 Klass* k = java_lang_Class::as_Klass(mirror);
1590 int slot = java_lang_reflect_Field::slot(reflected);
1591 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1592
1593 KlassHandle kh(THREAD, k);
1594 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1595
1596 if (modifiers & JVM_ACC_STATIC) {
1597 // for static fields we only look in the current class
1598 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1599 assert(false, "cannot find static field");
1600 return false;
1601 }
1602 } else {
1603 // for instance fields we start with the current class and work
1604 // our way up through the superclass chain
1605 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1606 assert(false, "cannot find instance field");
1607 return false;
1608 }
1609 }
1610 return true;
1611 }
1612
1613 static Method* jvm_get_method_common(jobject method) {
1614 // some of this code was adapted from from jni_FromReflectedMethod
1615
1616 oop reflected = JNIHandles::resolve_non_null(method);
1617 oop mirror = NULL;
1618 int slot = 0;
1619
1620 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1621 mirror = java_lang_reflect_Constructor::clazz(reflected);
1622 slot = java_lang_reflect_Constructor::slot(reflected);
1623 } else {
1624 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1625 "wrong type");
1626 mirror = java_lang_reflect_Method::clazz(reflected);
1627 slot = java_lang_reflect_Method::slot(reflected);
1628 }
1629 Klass* k = java_lang_Class::as_Klass(mirror);
1630
1631 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1632 assert(m != NULL, "cannot find method");
1633 return m; // caller has to deal with NULL in product mode
1634 }
1635
1636 /* Type use annotations support (JDK 1.8) */
1637
1638 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1639 assert (cls != NULL, "illegal class");
1640 JVMWrapper("JVM_GetClassTypeAnnotations");
1641 ResourceMark rm(THREAD);
1642 // Return null for arrays and primitives
1643 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1644 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1645 if (k->is_instance_klass()) {
1646 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1647 if (type_annotations != NULL) {
1648 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1649 return (jbyteArray) JNIHandles::make_local(env, a);
1650 }
1651 }
1652 }
1653 return NULL;
1654 JVM_END
1655
1656 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1657 assert (method != NULL, "illegal method");
1658 JVMWrapper("JVM_GetMethodTypeAnnotations");
1659
1660 // method is a handle to a java.lang.reflect.Method object
1661 Method* m = jvm_get_method_common(method);
1662 if (m == NULL) {
1663 return NULL;
1664 }
1665
1666 AnnotationArray* type_annotations = m->type_annotations();
1667 if (type_annotations != NULL) {
1668 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1669 return (jbyteArray) JNIHandles::make_local(env, a);
1670 }
1671
1672 return NULL;
1673 JVM_END
1674
1675 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1676 assert (field != NULL, "illegal field");
1677 JVMWrapper("JVM_GetFieldTypeAnnotations");
1678
1679 fieldDescriptor fd;
1680 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1681 if (!gotFd) {
1682 return NULL;
1683 }
1684
1685 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1686 JVM_END
1687
1688 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1689 if (!cp->is_within_bounds(index)) {
1690 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1691 }
1692 }
1693
1694 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1695 {
1696 JVMWrapper("JVM_GetMethodParameters");
1697 // method is a handle to a java.lang.reflect.Method object
1698 Method* method_ptr = jvm_get_method_common(method);
1699 methodHandle mh (THREAD, method_ptr);
1700 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1701 const int num_params = mh->method_parameters_length();
1702
1703 if (num_params < 0) {
1704 // A -1 return value from method_parameters_length means there is no
1705 // parameter data. Return null to indicate this to the reflection
1706 // API.
1707 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1708 return (jobjectArray)NULL;
1709 } else {
1710 // Otherwise, we return something up to reflection, even if it is
1711 // a zero-length array. Why? Because in some cases this can
1712 // trigger a MalformedParametersException.
1713
1714 // make sure all the symbols are properly formatted
1715 for (int i = 0; i < num_params; i++) {
1716 MethodParametersElement* params = mh->method_parameters_start();
1717 int index = params[i].name_cp_index;
1718 bounds_check(mh->constants(), index, CHECK_NULL);
1719
1720 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1721 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1722 "Wrong type at constant pool index");
1723 }
1724
1725 }
1726
1727 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1728 objArrayHandle result (THREAD, result_oop);
1729
1730 for (int i = 0; i < num_params; i++) {
1731 MethodParametersElement* params = mh->method_parameters_start();
1732 // For a 0 index, give a NULL symbol
1733 Symbol* sym = 0 != params[i].name_cp_index ?
1734 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1735 int flags = params[i].flags;
1736 oop param = Reflection::new_parameter(reflected_method, i, sym,
1737 flags, CHECK_NULL);
1738 result->obj_at_put(i, param);
1739 }
1740 return (jobjectArray)JNIHandles::make_local(env, result());
1741 }
1742 }
1743 JVM_END
1744
1745 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1746
1747 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1748 {
1749 JVMWrapper("JVM_GetClassDeclaredFields");
1750 JvmtiVMObjectAllocEventCollector oam;
1751
1752 // Exclude primitive types and array types
1753 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1754 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1755 // Return empty array
1756 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1757 return (jobjectArray) JNIHandles::make_local(env, res);
1758 }
1759
1760 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1761 constantPoolHandle cp(THREAD, k->constants());
1762
1763 // Ensure class is linked
1764 k->link_class(CHECK_NULL);
1765
1766 // Allocate result
1767 int num_fields;
1768
1769 if (publicOnly) {
1770 num_fields = 0;
1771 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
1772 if (fs.access_flags().is_public()) ++num_fields;
1773 }
1774 } else {
1775 num_fields = k->java_fields_count();
1776 }
1777
1778 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1779 objArrayHandle result (THREAD, r);
1780
1781 int out_idx = 0;
1782 fieldDescriptor fd;
1783 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1784 if (!publicOnly || fs.access_flags().is_public()) {
1785 fd.reinitialize(k(), fs.index());
1786 oop field = Reflection::new_field(&fd, CHECK_NULL);
1787 result->obj_at_put(out_idx, field);
1788 ++out_idx;
1789 }
1790 }
1791 assert(out_idx == num_fields, "just checking");
1792 return (jobjectArray) JNIHandles::make_local(env, result());
1793 }
1794 JVM_END
1795
1796 static bool select_method(methodHandle method, bool want_constructor) {
1797 if (want_constructor) {
1798 return (method->is_initializer() && !method->is_static());
1799 } else {
1800 return (!method->is_initializer() && !method->is_overpass());
1801 }
1802 }
1803
1804 static jobjectArray get_class_declared_methods_helper(
1805 JNIEnv *env,
1806 jclass ofClass, jboolean publicOnly,
1807 bool want_constructor,
1808 Klass* klass, TRAPS) {
1809
1810 JvmtiVMObjectAllocEventCollector oam;
1811
1812 // Exclude primitive types and array types
1813 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1814 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1815 // Return empty array
1816 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1817 return (jobjectArray) JNIHandles::make_local(env, res);
1818 }
1819
1820 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1821
1822 // Ensure class is linked
1823 k->link_class(CHECK_NULL);
1824
1825 Array<Method*>* methods = k->methods();
1826 int methods_length = methods->length();
1827
1828 // Save original method_idnum in case of redefinition, which can change
1829 // the idnum of obsolete methods. The new method will have the same idnum
1830 // but if we refresh the methods array, the counts will be wrong.
1831 ResourceMark rm(THREAD);
1832 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1833 int num_methods = 0;
1834
1835 for (int i = 0; i < methods_length; i++) {
1836 methodHandle method(THREAD, methods->at(i));
1837 if (select_method(method, want_constructor)) {
1838 if (!publicOnly || method->is_public()) {
1839 idnums->push(method->method_idnum());
1840 ++num_methods;
1841 }
1842 }
1843 }
1844
1845 // Allocate result
1846 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1847 objArrayHandle result (THREAD, r);
1848
1849 // Now just put the methods that we selected above, but go by their idnum
1850 // in case of redefinition. The methods can be redefined at any safepoint,
1851 // so above when allocating the oop array and below when creating reflect
1852 // objects.
1853 for (int i = 0; i < num_methods; i++) {
1854 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1855 if (method.is_null()) {
1856 // Method may have been deleted and seems this API can handle null
1857 // Otherwise should probably put a method that throws NSME
1858 result->obj_at_put(i, NULL);
1859 } else {
1860 oop m;
1861 if (want_constructor) {
1862 m = Reflection::new_constructor(method, CHECK_NULL);
1863 } else {
1864 m = Reflection::new_method(method, false, CHECK_NULL);
1865 }
1866 result->obj_at_put(i, m);
1867 }
1868 }
1869
1870 return (jobjectArray) JNIHandles::make_local(env, result());
1871 }
1872
1873 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1874 {
1875 JVMWrapper("JVM_GetClassDeclaredMethods");
1876 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1877 /*want_constructor*/ false,
1878 SystemDictionary::reflect_Method_klass(), THREAD);
1879 }
1880 JVM_END
1881
1882 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1883 {
1884 JVMWrapper("JVM_GetClassDeclaredConstructors");
1885 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1886 /*want_constructor*/ true,
1887 SystemDictionary::reflect_Constructor_klass(), THREAD);
1888 }
1889 JVM_END
1890
1891 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1892 {
1893 JVMWrapper("JVM_GetClassAccessFlags");
1894 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1895 // Primitive type
1896 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1897 }
1898
1899 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1900 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1901 }
1902 JVM_END
1903
1904
1905 // Constant pool access //////////////////////////////////////////////////////////
1906
1907 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1908 {
1909 JVMWrapper("JVM_GetClassConstantPool");
1910 JvmtiVMObjectAllocEventCollector oam;
1911
1912 // Return null for primitives and arrays
1913 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1914 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1915 if (k->is_instance_klass()) {
1916 instanceKlassHandle k_h(THREAD, k);
1917 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1918 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1919 return JNIHandles::make_local(jcp());
1920 }
1921 }
1922 return NULL;
1923 }
1924 JVM_END
1925
1926
1927 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1928 {
1929 JVMWrapper("JVM_ConstantPoolGetSize");
1930 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1931 return cp->length();
1932 }
1933 JVM_END
1934
1935
1936 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1937 {
1938 JVMWrapper("JVM_ConstantPoolGetClassAt");
1939 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1940 bounds_check(cp, index, CHECK_NULL);
1941 constantTag tag = cp->tag_at(index);
1942 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1943 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1944 }
1945 Klass* k = cp->klass_at(index, CHECK_NULL);
1946 return (jclass) JNIHandles::make_local(k->java_mirror());
1947 }
1948 JVM_END
1949
1950 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1951 {
1952 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1953 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1954 bounds_check(cp, index, CHECK_NULL);
1955 constantTag tag = cp->tag_at(index);
1956 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1957 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1958 }
1959 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1960 if (k == NULL) return NULL;
1961 return (jclass) JNIHandles::make_local(k->java_mirror());
1962 }
1963 JVM_END
1964
1965 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1966 constantTag tag = cp->tag_at(index);
1967 if (!tag.is_method() && !tag.is_interface_method()) {
1968 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1969 }
1970 int klass_ref = cp->uncached_klass_ref_index_at(index);
1971 Klass* k_o;
1972 if (force_resolution) {
1973 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1974 } else {
1975 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1976 if (k_o == NULL) return NULL;
1977 }
1978 instanceKlassHandle k(THREAD, k_o);
1979 Symbol* name = cp->uncached_name_ref_at(index);
1980 Symbol* sig = cp->uncached_signature_ref_at(index);
1981 methodHandle m (THREAD, k->find_method(name, sig));
1982 if (m.is_null()) {
1983 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1984 }
1985 oop method;
1986 if (!m->is_initializer() || m->is_static()) {
1987 method = Reflection::new_method(m, true, CHECK_NULL);
1988 } else {
1989 method = Reflection::new_constructor(m, CHECK_NULL);
1990 }
1991 return JNIHandles::make_local(method);
1992 }
1993
1994 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1995 {
1996 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1997 JvmtiVMObjectAllocEventCollector oam;
1998 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1999 bounds_check(cp, index, CHECK_NULL);
2000 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2001 return res;
2002 }
2003 JVM_END
2004
2005 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2006 {
2007 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2008 JvmtiVMObjectAllocEventCollector oam;
2009 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2010 bounds_check(cp, index, CHECK_NULL);
2011 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2012 return res;
2013 }
2014 JVM_END
2015
2016 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2017 constantTag tag = cp->tag_at(index);
2018 if (!tag.is_field()) {
2019 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2020 }
2021 int klass_ref = cp->uncached_klass_ref_index_at(index);
2022 Klass* k_o;
2023 if (force_resolution) {
2024 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2025 } else {
2026 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2027 if (k_o == NULL) return NULL;
2028 }
2029 instanceKlassHandle k(THREAD, k_o);
2030 Symbol* name = cp->uncached_name_ref_at(index);
2031 Symbol* sig = cp->uncached_signature_ref_at(index);
2032 fieldDescriptor fd;
2033 Klass* target_klass = k->find_field(name, sig, &fd);
2034 if (target_klass == NULL) {
2035 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2036 }
2037 oop field = Reflection::new_field(&fd, CHECK_NULL);
2038 return JNIHandles::make_local(field);
2039 }
2040
2041 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2042 {
2043 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2044 JvmtiVMObjectAllocEventCollector oam;
2045 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2046 bounds_check(cp, index, CHECK_NULL);
2047 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2048 return res;
2049 }
2050 JVM_END
2051
2052 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2053 {
2054 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2055 JvmtiVMObjectAllocEventCollector oam;
2056 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2057 bounds_check(cp, index, CHECK_NULL);
2058 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2059 return res;
2060 }
2061 JVM_END
2062
2063 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2064 {
2065 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2066 JvmtiVMObjectAllocEventCollector oam;
2067 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2068 bounds_check(cp, index, CHECK_NULL);
2069 constantTag tag = cp->tag_at(index);
2070 if (!tag.is_field_or_method()) {
2071 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2072 }
2073 int klass_ref = cp->uncached_klass_ref_index_at(index);
2074 Symbol* klass_name = cp->klass_name_at(klass_ref);
2075 Symbol* member_name = cp->uncached_name_ref_at(index);
2076 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2077 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2078 objArrayHandle dest(THREAD, dest_o);
2079 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2080 dest->obj_at_put(0, str());
2081 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2082 dest->obj_at_put(1, str());
2083 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2084 dest->obj_at_put(2, str());
2085 return (jobjectArray) JNIHandles::make_local(dest());
2086 }
2087 JVM_END
2088
2089 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2090 {
2091 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2092 JvmtiVMObjectAllocEventCollector oam;
2093 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2094 bounds_check(cp, index, CHECK_0);
2095 constantTag tag = cp->tag_at(index);
2096 if (!tag.is_field_or_method()) {
2097 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2098 }
2099 return (jint) cp->uncached_klass_ref_index_at(index);
2100 }
2101 JVM_END
2102
2103 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2104 {
2105 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2106 JvmtiVMObjectAllocEventCollector oam;
2107 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2108 bounds_check(cp, index, CHECK_0);
2109 constantTag tag = cp->tag_at(index);
2110 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2111 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2112 }
2113 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2114 }
2115 JVM_END
2116
2117 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2118 {
2119 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2120 JvmtiVMObjectAllocEventCollector oam;
2121 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2122 bounds_check(cp, index, CHECK_NULL);
2123 constantTag tag = cp->tag_at(index);
2124 if (!tag.is_name_and_type()) {
2125 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2126 }
2127 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2128 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2129 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2130 objArrayHandle dest(THREAD, dest_o);
2131 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2132 dest->obj_at_put(0, str());
2133 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2134 dest->obj_at_put(1, str());
2135 return (jobjectArray) JNIHandles::make_local(dest());
2136 }
2137 JVM_END
2138
2139 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2140 {
2141 JVMWrapper("JVM_ConstantPoolGetIntAt");
2142 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2143 bounds_check(cp, index, CHECK_0);
2144 constantTag tag = cp->tag_at(index);
2145 if (!tag.is_int()) {
2146 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2147 }
2148 return cp->int_at(index);
2149 }
2150 JVM_END
2151
2152 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2153 {
2154 JVMWrapper("JVM_ConstantPoolGetLongAt");
2155 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2156 bounds_check(cp, index, CHECK_(0L));
2157 constantTag tag = cp->tag_at(index);
2158 if (!tag.is_long()) {
2159 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2160 }
2161 return cp->long_at(index);
2162 }
2163 JVM_END
2164
2165 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2166 {
2167 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2168 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2169 bounds_check(cp, index, CHECK_(0.0f));
2170 constantTag tag = cp->tag_at(index);
2171 if (!tag.is_float()) {
2172 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2173 }
2174 return cp->float_at(index);
2175 }
2176 JVM_END
2177
2178 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2179 {
2180 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2181 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2182 bounds_check(cp, index, CHECK_(0.0));
2183 constantTag tag = cp->tag_at(index);
2184 if (!tag.is_double()) {
2185 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2186 }
2187 return cp->double_at(index);
2188 }
2189 JVM_END
2190
2191 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2192 {
2193 JVMWrapper("JVM_ConstantPoolGetStringAt");
2194 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2195 bounds_check(cp, index, CHECK_NULL);
2196 constantTag tag = cp->tag_at(index);
2197 if (!tag.is_string()) {
2198 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2199 }
2200 oop str = cp->string_at(index, CHECK_NULL);
2201 return (jstring) JNIHandles::make_local(str);
2202 }
2203 JVM_END
2204
2205 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2206 {
2207 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2208 JvmtiVMObjectAllocEventCollector oam;
2209 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2210 bounds_check(cp, index, CHECK_NULL);
2211 constantTag tag = cp->tag_at(index);
2212 if (!tag.is_symbol()) {
2213 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2214 }
2215 Symbol* sym = cp->symbol_at(index);
2216 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2217 return (jstring) JNIHandles::make_local(str());
2218 }
2219 JVM_END
2220
2221 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2222 {
2223 JVMWrapper("JVM_ConstantPoolGetTagAt");
2224 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2225 bounds_check(cp, index, CHECK_0);
2226 constantTag tag = cp->tag_at(index);
2227 jbyte result = tag.value();
2228 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2229 // they are changed to the corresponding tags from the JVM spec, so that java code in
2230 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2231 if (tag.is_klass_or_reference()) {
2232 result = JVM_CONSTANT_Class;
2233 } else if (tag.is_string_index()) {
2234 result = JVM_CONSTANT_String;
2235 } else if (tag.is_method_type_in_error()) {
2236 result = JVM_CONSTANT_MethodType;
2237 } else if (tag.is_method_handle_in_error()) {
2238 result = JVM_CONSTANT_MethodHandle;
2239 }
2240 return result;
2241 }
2242 JVM_END
2243
2244 // Assertion support. //////////////////////////////////////////////////////////
2245
2246 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2247 JVMWrapper("JVM_DesiredAssertionStatus");
2248 assert(cls != NULL, "bad class");
2249
2250 oop r = JNIHandles::resolve(cls);
2251 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2252 if (java_lang_Class::is_primitive(r)) return false;
2253
2254 Klass* k = java_lang_Class::as_Klass(r);
2255 assert(k->is_instance_klass(), "must be an instance klass");
2256 if (!k->is_instance_klass()) return false;
2257
2258 ResourceMark rm(THREAD);
2259 const char* name = k->name()->as_C_string();
2260 bool system_class = k->class_loader() == NULL;
2261 return JavaAssertions::enabled(name, system_class);
2262
2263 JVM_END
2264
2265
2266 // Return a new AssertionStatusDirectives object with the fields filled in with
2267 // command-line assertion arguments (i.e., -ea, -da).
2268 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2269 JVMWrapper("JVM_AssertionStatusDirectives");
2270 JvmtiVMObjectAllocEventCollector oam;
2271 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2272 return JNIHandles::make_local(env, asd);
2273 JVM_END
2274
2275 // Verification ////////////////////////////////////////////////////////////////////////////////
2276
2277 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2278
2279 // RedefineClasses support: bug 6214132 caused verification to fail.
2280 // All functions from this section should call the jvmtiThreadSate function:
2281 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2282 // The function returns a Klass* of the _scratch_class if the verifier
2283 // was invoked in the middle of the class redefinition.
2284 // Otherwise it returns its argument value which is the _the_class Klass*.
2285 // Please, refer to the description in the jvmtiThreadSate.hpp.
2286
2287 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2288 JVMWrapper("JVM_GetClassNameUTF");
2289 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2290 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2291 return k->name()->as_utf8();
2292 JVM_END
2293
2294
2295 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2296 JVMWrapper("JVM_GetClassCPTypes");
2297 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2298 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2299 // types will have length zero if this is not an InstanceKlass
2300 // (length is determined by call to JVM_GetClassCPEntriesCount)
2301 if (k->is_instance_klass()) {
2302 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2303 for (int index = cp->length() - 1; index >= 0; index--) {
2304 constantTag tag = cp->tag_at(index);
2305 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2306 }
2307 }
2308 JVM_END
2309
2310
2311 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2312 JVMWrapper("JVM_GetClassCPEntriesCount");
2313 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2314 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2315 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2316 JVM_END
2317
2318
2319 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2320 JVMWrapper("JVM_GetClassFieldsCount");
2321 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2322 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2323 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2324 JVM_END
2325
2326
2327 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2328 JVMWrapper("JVM_GetClassMethodsCount");
2329 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2330 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2331 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2332 JVM_END
2333
2334
2335 // The following methods, used for the verifier, are never called with
2336 // array klasses, so a direct cast to InstanceKlass is safe.
2337 // Typically, these methods are called in a loop with bounds determined
2338 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2339 // zero for arrays.
2340 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2341 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2342 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2343 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2344 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2345 int length = method->checked_exceptions_length();
2346 if (length > 0) {
2347 CheckedExceptionElement* table= method->checked_exceptions_start();
2348 for (int i = 0; i < length; i++) {
2349 exceptions[i] = table[i].class_cp_index;
2350 }
2351 }
2352 JVM_END
2353
2354
2355 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2356 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2357 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2358 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2359 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2360 return method->checked_exceptions_length();
2361 JVM_END
2362
2363
2364 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2365 JVMWrapper("JVM_GetMethodIxByteCode");
2366 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2367 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2368 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2369 memcpy(code, method->code_base(), method->code_size());
2370 JVM_END
2371
2372
2373 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2374 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2375 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2376 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2377 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2378 return method->code_size();
2379 JVM_END
2380
2381
2382 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2383 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2384 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2385 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2386 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2387 ExceptionTable extable(method);
2388 entry->start_pc = extable.start_pc(entry_index);
2389 entry->end_pc = extable.end_pc(entry_index);
2390 entry->handler_pc = extable.handler_pc(entry_index);
2391 entry->catchType = extable.catch_type_index(entry_index);
2392 JVM_END
2393
2394
2395 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2396 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
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 return method->exception_table_length();
2401 JVM_END
2402
2403
2404 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2405 JVMWrapper("JVM_GetMethodIxModifiers");
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->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2410 JVM_END
2411
2412
2413 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2414 JVMWrapper("JVM_GetFieldIxModifiers");
2415 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2416 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2417 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2418 JVM_END
2419
2420
2421 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2422 JVMWrapper("JVM_GetMethodIxLocalsCount");
2423 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2424 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2425 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2426 return method->max_locals();
2427 JVM_END
2428
2429
2430 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2431 JVMWrapper("JVM_GetMethodIxArgsSize");
2432 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2433 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2434 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2435 return method->size_of_parameters();
2436 JVM_END
2437
2438
2439 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2440 JVMWrapper("JVM_GetMethodIxMaxStack");
2441 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2442 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2443 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2444 return method->verifier_max_stack();
2445 JVM_END
2446
2447
2448 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2449 JVMWrapper("JVM_IsConstructorIx");
2450 ResourceMark rm(THREAD);
2451 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2452 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2453 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2454 return method->name() == vmSymbols::object_initializer_name();
2455 JVM_END
2456
2457
2458 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2459 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2460 ResourceMark rm(THREAD);
2461 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2462 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2463 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2464 return method->is_overpass();
2465 JVM_END
2466
2467 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2468 JVMWrapper("JVM_GetMethodIxIxUTF");
2469 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2470 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2471 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2472 return method->name()->as_utf8();
2473 JVM_END
2474
2475
2476 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2477 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2478 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2479 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2480 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2481 return method->signature()->as_utf8();
2482 JVM_END
2483
2484 /**
2485 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2486 * read entries in the constant pool. Since the old verifier always
2487 * works on a copy of the code, it will not see any rewriting that
2488 * may possibly occur in the middle of verification. So it is important
2489 * that nothing it calls tries to use the cpCache instead of the raw
2490 * constant pool, so we must use cp->uncached_x methods when appropriate.
2491 */
2492 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2493 JVMWrapper("JVM_GetCPFieldNameUTF");
2494 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2495 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2496 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2497 switch (cp->tag_at(cp_index).value()) {
2498 case JVM_CONSTANT_Fieldref:
2499 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2500 default:
2501 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2502 }
2503 ShouldNotReachHere();
2504 return NULL;
2505 JVM_END
2506
2507
2508 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2509 JVMWrapper("JVM_GetCPMethodNameUTF");
2510 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2511 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2512 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2513 switch (cp->tag_at(cp_index).value()) {
2514 case JVM_CONSTANT_InterfaceMethodref:
2515 case JVM_CONSTANT_Methodref:
2516 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2517 default:
2518 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2519 }
2520 ShouldNotReachHere();
2521 return NULL;
2522 JVM_END
2523
2524
2525 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2526 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2527 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2528 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2529 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2530 switch (cp->tag_at(cp_index).value()) {
2531 case JVM_CONSTANT_InterfaceMethodref:
2532 case JVM_CONSTANT_Methodref:
2533 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2534 default:
2535 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2536 }
2537 ShouldNotReachHere();
2538 return NULL;
2539 JVM_END
2540
2541
2542 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2543 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2544 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2545 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2546 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2547 switch (cp->tag_at(cp_index).value()) {
2548 case JVM_CONSTANT_Fieldref:
2549 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2550 default:
2551 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2552 }
2553 ShouldNotReachHere();
2554 return NULL;
2555 JVM_END
2556
2557
2558 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2559 JVMWrapper("JVM_GetCPClassNameUTF");
2560 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2561 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2562 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2563 Symbol* classname = cp->klass_name_at(cp_index);
2564 return classname->as_utf8();
2565 JVM_END
2566
2567
2568 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2569 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2570 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2571 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2572 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2573 switch (cp->tag_at(cp_index).value()) {
2574 case JVM_CONSTANT_Fieldref: {
2575 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2576 Symbol* classname = cp->klass_name_at(class_index);
2577 return classname->as_utf8();
2578 }
2579 default:
2580 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2581 }
2582 ShouldNotReachHere();
2583 return NULL;
2584 JVM_END
2585
2586
2587 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2588 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2589 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2590 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2591 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2592 switch (cp->tag_at(cp_index).value()) {
2593 case JVM_CONSTANT_Methodref:
2594 case JVM_CONSTANT_InterfaceMethodref: {
2595 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2596 Symbol* classname = cp->klass_name_at(class_index);
2597 return classname->as_utf8();
2598 }
2599 default:
2600 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2601 }
2602 ShouldNotReachHere();
2603 return NULL;
2604 JVM_END
2605
2606
2607 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2608 JVMWrapper("JVM_GetCPFieldModifiers");
2609 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2610 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2611 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2612 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2613 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2614 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2615 switch (cp->tag_at(cp_index).value()) {
2616 case JVM_CONSTANT_Fieldref: {
2617 Symbol* name = cp->uncached_name_ref_at(cp_index);
2618 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2619 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2620 if (fs.name() == name && fs.signature() == signature) {
2621 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2622 }
2623 }
2624 return -1;
2625 }
2626 default:
2627 fatal("JVM_GetCPFieldModifiers: illegal constant");
2628 }
2629 ShouldNotReachHere();
2630 return 0;
2631 JVM_END
2632
2633
2634 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2635 JVMWrapper("JVM_GetCPMethodModifiers");
2636 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2637 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2638 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2639 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2640 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2641 switch (cp->tag_at(cp_index).value()) {
2642 case JVM_CONSTANT_Methodref:
2643 case JVM_CONSTANT_InterfaceMethodref: {
2644 Symbol* name = cp->uncached_name_ref_at(cp_index);
2645 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2646 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2647 int methods_count = methods->length();
2648 for (int i = 0; i < methods_count; i++) {
2649 Method* method = methods->at(i);
2650 if (method->name() == name && method->signature() == signature) {
2651 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2652 }
2653 }
2654 return -1;
2655 }
2656 default:
2657 fatal("JVM_GetCPMethodModifiers: illegal constant");
2658 }
2659 ShouldNotReachHere();
2660 return 0;
2661 JVM_END
2662
2663
2664 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2665
2666 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2667 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2668 JVM_END
2669
2670
2671 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2672 JVMWrapper("JVM_IsSameClassPackage");
2673 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2674 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2675 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2676 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2677 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2678 JVM_END
2679
2680 // Printing support //////////////////////////////////////////////////
2681 extern "C" {
2682
2683 ATTRIBUTE_PRINTF(3, 0)
2684 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2685 // see bug 4399518, 4417214
2686 if ((intptr_t)count <= 0) return -1;
2687
2688 int result = vsnprintf(str, count, fmt, args);
2689 // Note: on truncation vsnprintf(3) on Unix returns numbers of
2690 // characters which would have been written had the buffer been large
2691 // enough; on Windows, it returns -1. We handle both cases here and
2692 // always return -1, and perform null termination.
2693 if ((result > 0 && (size_t)result >= count) || result == -1) {
2694 str[count - 1] = '\0';
2695 result = -1;
2696 }
2697
2698 return result;
2699 }
2700
2701 ATTRIBUTE_PRINTF(3, 0)
2702 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2703 va_list args;
2704 int len;
2705 va_start(args, fmt);
2706 len = jio_vsnprintf(str, count, fmt, args);
2707 va_end(args);
2708 return len;
2709 }
2710
2711 ATTRIBUTE_PRINTF(2,3)
2712 int jio_fprintf(FILE* f, const char *fmt, ...) {
2713 int len;
2714 va_list args;
2715 va_start(args, fmt);
2716 len = jio_vfprintf(f, fmt, args);
2717 va_end(args);
2718 return len;
2719 }
2720
2721 ATTRIBUTE_PRINTF(2, 0)
2722 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2723 if (Arguments::vfprintf_hook() != NULL) {
2724 return Arguments::vfprintf_hook()(f, fmt, args);
2725 } else {
2726 return vfprintf(f, fmt, args);
2727 }
2728 }
2729
2730 ATTRIBUTE_PRINTF(1, 2)
2731 JNIEXPORT int jio_printf(const char *fmt, ...) {
2732 int len;
2733 va_list args;
2734 va_start(args, fmt);
2735 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2736 va_end(args);
2737 return len;
2738 }
2739
2740
2741 // HotSpot specific jio method
2742 void jio_print(const char* s) {
2743 // Try to make this function as atomic as possible.
2744 if (Arguments::vfprintf_hook() != NULL) {
2745 jio_fprintf(defaultStream::output_stream(), "%s", s);
2746 } else {
2747 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2748 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2749 }
2750 }
2751
2752 } // Extern C
2753
2754 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2755
2756 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2757 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2758 // OSThread objects. The exception to this rule is when the target object is the thread
2759 // doing the operation, in which case we know that the thread won't exit until the
2760 // operation is done (all exits being voluntary). There are a few cases where it is
2761 // rather silly to do operations on yourself, like resuming yourself or asking whether
2762 // you are alive. While these can still happen, they are not subject to deadlocks if
2763 // the lock is held while the operation occurs (this is not the case for suspend, for
2764 // instance), and are very unlikely. Because IsAlive needs to be fast and its
2765 // implementation is local to this file, we always lock Threads_lock for that one.
2766
2767 static void thread_entry(JavaThread* thread, TRAPS) {
2768 HandleMark hm(THREAD);
2769 Handle obj(THREAD, thread->threadObj());
2770 JavaValue result(T_VOID);
2771 JavaCalls::call_virtual(&result,
2772 obj,
2773 KlassHandle(THREAD, SystemDictionary::Thread_klass()),
2774 vmSymbols::run_method_name(),
2775 vmSymbols::void_method_signature(),
2776 THREAD);
2777 }
2778
2779
2780 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2781 JVMWrapper("JVM_StartThread");
2782 JavaThread *native_thread = NULL;
2783
2784 // We cannot hold the Threads_lock when we throw an exception,
2785 // due to rank ordering issues. Example: we might need to grab the
2786 // Heap_lock while we construct the exception.
2787 bool throw_illegal_thread_state = false;
2788
2789 // We must release the Threads_lock before we can post a jvmti event
2790 // in Thread::start.
2791 {
2792 // Ensure that the C++ Thread and OSThread structures aren't freed before
2793 // we operate.
2794 MutexLocker mu(Threads_lock);
2795
2796 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2797 // re-starting an already started thread, so we should usually find
2798 // that the JavaThread is null. However for a JNI attached thread
2799 // there is a small window between the Thread object being created
2800 // (with its JavaThread set) and the update to its threadStatus, so we
2801 // have to check for this
2802 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2803 throw_illegal_thread_state = true;
2804 } else {
2805 // We could also check the stillborn flag to see if this thread was already stopped, but
2806 // for historical reasons we let the thread detect that itself when it starts running
2807
2808 jlong size =
2809 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2810 // Allocate the C++ Thread structure and create the native thread. The
2811 // stack size retrieved from java is signed, but the constructor takes
2812 // size_t (an unsigned type), so avoid passing negative values which would
2813 // result in really large stacks.
2814 size_t sz = size > 0 ? (size_t) size : 0;
2815 native_thread = new JavaThread(&thread_entry, sz);
2816
2817 // At this point it may be possible that no osthread was created for the
2818 // JavaThread due to lack of memory. Check for this situation and throw
2819 // an exception if necessary. Eventually we may want to change this so
2820 // that we only grab the lock if the thread was created successfully -
2821 // then we can also do this check and throw the exception in the
2822 // JavaThread constructor.
2823 if (native_thread->osthread() != NULL) {
2824 // Note: the current thread is not being used within "prepare".
2825 native_thread->prepare(jthread);
2826 }
2827 }
2828 }
2829
2830 if (throw_illegal_thread_state) {
2831 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2832 }
2833
2834 assert(native_thread != NULL, "Starting null thread?");
2835
2836 if (native_thread->osthread() == NULL) {
2837 // No one should hold a reference to the 'native_thread'.
2838 delete native_thread;
2839 if (JvmtiExport::should_post_resource_exhausted()) {
2840 JvmtiExport::post_resource_exhausted(
2841 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2842 os::native_thread_creation_failed_msg());
2843 }
2844 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2845 os::native_thread_creation_failed_msg());
2846 }
2847
2848 Thread::start(native_thread);
2849
2850 JVM_END
2851
2852 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2853 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2854 // but is thought to be reliable and simple. In the case, where the receiver is the
2855 // same thread as the sender, no safepoint is needed.
2856 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2857 JVMWrapper("JVM_StopThread");
2858
2859 oop java_throwable = JNIHandles::resolve(throwable);
2860 if (java_throwable == NULL) {
2861 THROW(vmSymbols::java_lang_NullPointerException());
2862 }
2863 oop java_thread = JNIHandles::resolve_non_null(jthread);
2864 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2865 Events::log_exception(JavaThread::current(),
2866 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2867 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2868 // First check if thread is alive
2869 if (receiver != NULL) {
2870 // Check if exception is getting thrown at self (use oop equality, since the
2871 // target object might exit)
2872 if (java_thread == thread->threadObj()) {
2873 THROW_OOP(java_throwable);
2874 } else {
2875 // Enques a VM_Operation to stop all threads and then deliver the exception...
2876 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2877 }
2878 }
2879 else {
2880 // Either:
2881 // - target thread has not been started before being stopped, or
2882 // - target thread already terminated
2883 // We could read the threadStatus to determine which case it is
2884 // but that is overkill as it doesn't matter. We must set the
2885 // stillborn flag for the first case, and if the thread has already
2886 // exited setting this flag has no affect
2887 java_lang_Thread::set_stillborn(java_thread);
2888 }
2889 JVM_END
2890
2891
2892 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2893 JVMWrapper("JVM_IsThreadAlive");
2894
2895 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2896 return java_lang_Thread::is_alive(thread_oop);
2897 JVM_END
2898
2899
2900 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2901 JVMWrapper("JVM_SuspendThread");
2902 oop java_thread = JNIHandles::resolve_non_null(jthread);
2903 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2904
2905 if (receiver != NULL) {
2906 // thread has run and has not exited (still on threads list)
2907
2908 {
2909 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2910 if (receiver->is_external_suspend()) {
2911 // Don't allow nested external suspend requests. We can't return
2912 // an error from this interface so just ignore the problem.
2913 return;
2914 }
2915 if (receiver->is_exiting()) { // thread is in the process of exiting
2916 return;
2917 }
2918 receiver->set_external_suspend();
2919 }
2920
2921 // java_suspend() will catch threads in the process of exiting
2922 // and will ignore them.
2923 receiver->java_suspend();
2924
2925 // It would be nice to have the following assertion in all the
2926 // time, but it is possible for a racing resume request to have
2927 // resumed this thread right after we suspended it. Temporarily
2928 // enable this assertion if you are chasing a different kind of
2929 // bug.
2930 //
2931 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2932 // receiver->is_being_ext_suspended(), "thread is not suspended");
2933 }
2934 JVM_END
2935
2936
2937 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2938 JVMWrapper("JVM_ResumeThread");
2939 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2940 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2941 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2942 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2943 // looks at it.
2944 MutexLocker ml(Threads_lock);
2945 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2946 if (thr != NULL) {
2947 // the thread has run and is not in the process of exiting
2948 thr->java_resume();
2949 }
2950 JVM_END
2951
2952
2953 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2954 JVMWrapper("JVM_SetThreadPriority");
2955 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2956 MutexLocker ml(Threads_lock);
2957 oop java_thread = JNIHandles::resolve_non_null(jthread);
2958 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2959 JavaThread* thr = java_lang_Thread::thread(java_thread);
2960 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
2961 Thread::set_priority(thr, (ThreadPriority)prio);
2962 }
2963 JVM_END
2964
2965
2966 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2967 JVMWrapper("JVM_Yield");
2968 if (os::dont_yield()) return;
2969 HOTSPOT_THREAD_YIELD();
2970
2971 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
2972 // Critical for similar threading behaviour
2973 if (ConvertYieldToSleep) {
2974 os::sleep(thread, MinSleepInterval, false);
2975 } else {
2976 os::naked_yield();
2977 }
2978 JVM_END
2979
2980
2981 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2982 JVMWrapper("JVM_Sleep");
2983
2984 if (millis < 0) {
2985 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2986 }
2987
2988 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2989 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2990 }
2991
2992 // Save current thread state and restore it at the end of this block.
2993 // And set new thread state to SLEEPING.
2994 JavaThreadSleepState jtss(thread);
2995
2996 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2997
2998 EventThreadSleep event;
2999
3000 if (millis == 0) {
3001 // When ConvertSleepToYield is on, this matches the classic VM implementation of
3002 // JVM_Sleep. Critical for similar threading behaviour (Win32)
3003 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
3004 // for SOLARIS
3005 if (ConvertSleepToYield) {
3006 os::naked_yield();
3007 } else {
3008 ThreadState old_state = thread->osthread()->get_state();
3009 thread->osthread()->set_state(SLEEPING);
3010 os::sleep(thread, MinSleepInterval, false);
3011 thread->osthread()->set_state(old_state);
3012 }
3013 } else {
3014 ThreadState old_state = thread->osthread()->get_state();
3015 thread->osthread()->set_state(SLEEPING);
3016 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3017 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3018 // us while we were sleeping. We do not overwrite those.
3019 if (!HAS_PENDING_EXCEPTION) {
3020 if (event.should_commit()) {
3021 event.set_time(millis);
3022 event.commit();
3023 }
3024 HOTSPOT_THREAD_SLEEP_END(1);
3025
3026 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3027 // to properly restore the thread state. That's likely wrong.
3028 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3029 }
3030 }
3031 thread->osthread()->set_state(old_state);
3032 }
3033 if (event.should_commit()) {
3034 event.set_time(millis);
3035 event.commit();
3036 }
3037 HOTSPOT_THREAD_SLEEP_END(0);
3038 JVM_END
3039
3040 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3041 JVMWrapper("JVM_CurrentThread");
3042 oop jthread = thread->threadObj();
3043 assert (thread != NULL, "no current thread!");
3044 return JNIHandles::make_local(env, jthread);
3045 JVM_END
3046
3047
3048 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3049 JVMWrapper("JVM_CountStackFrames");
3050
3051 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3052 oop java_thread = JNIHandles::resolve_non_null(jthread);
3053 bool throw_illegal_thread_state = false;
3054 int count = 0;
3055
3056 {
3057 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3058 // We need to re-resolve the java_thread, since a GC might have happened during the
3059 // acquire of the lock
3060 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3061
3062 if (thr == NULL) {
3063 // do nothing
3064 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
3065 // Check whether this java thread has been suspended already. If not, throws
3066 // IllegalThreadStateException. We defer to throw that exception until
3067 // Threads_lock is released since loading exception class has to leave VM.
3068 // The correct way to test a thread is actually suspended is
3069 // wait_for_ext_suspend_completion(), but we can't call that while holding
3070 // the Threads_lock. The above tests are sufficient for our purposes
3071 // provided the walkability of the stack is stable - which it isn't
3072 // 100% but close enough for most practical purposes.
3073 throw_illegal_thread_state = true;
3074 } else {
3075 // Count all java activation, i.e., number of vframes
3076 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
3077 // Native frames are not counted
3078 if (!vfst.method()->is_native()) count++;
3079 }
3080 }
3081 }
3082
3083 if (throw_illegal_thread_state) {
3084 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3085 "this thread is not suspended");
3086 }
3087 return count;
3088 JVM_END
3089
3090 // Consider: A better way to implement JVM_Interrupt() is to acquire
3091 // Threads_lock to resolve the jthread into a Thread pointer, fetch
3092 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
3093 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
3094 // outside the critical section. Threads_lock is hot so we want to minimize
3095 // the hold-time. A cleaner interface would be to decompose interrupt into
3096 // two steps. The 1st phase, performed under Threads_lock, would return
3097 // a closure that'd be invoked after Threads_lock was dropped.
3098 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
3099 // admit spurious wakeups.
3100
3101 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3102 JVMWrapper("JVM_Interrupt");
3103
3104 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3105 oop java_thread = JNIHandles::resolve_non_null(jthread);
3106 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3107 // We need to re-resolve the java_thread, since a GC might have happened during the
3108 // acquire of the lock
3109 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3110 if (thr != NULL) {
3111 Thread::interrupt(thr);
3112 }
3113 JVM_END
3114
3115
3116 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3117 JVMWrapper("JVM_IsInterrupted");
3118
3119 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3120 oop java_thread = JNIHandles::resolve_non_null(jthread);
3121 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3122 // We need to re-resolve the java_thread, since a GC might have happened during the
3123 // acquire of the lock
3124 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3125 if (thr == NULL) {
3126 return JNI_FALSE;
3127 } else {
3128 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3129 }
3130 JVM_END
3131
3132
3133 // Return true iff the current thread has locked the object passed in
3134
3135 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3136 JVMWrapper("JVM_HoldsLock");
3137 assert(THREAD->is_Java_thread(), "sanity check");
3138 if (obj == NULL) {
3139 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3140 }
3141 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3142 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3143 JVM_END
3144
3145
3146 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3147 JVMWrapper("JVM_DumpAllStacks");
3148 VM_PrintThreads op;
3149 VMThread::execute(&op);
3150 if (JvmtiExport::should_post_data_dump()) {
3151 JvmtiExport::post_data_dump();
3152 }
3153 JVM_END
3154
3155 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3156 JVMWrapper("JVM_SetNativeThreadName");
3157 ResourceMark rm(THREAD);
3158 oop java_thread = JNIHandles::resolve_non_null(jthread);
3159 JavaThread* thr = java_lang_Thread::thread(java_thread);
3160 // Thread naming only supported for the current thread, doesn't work for
3161 // target threads.
3162 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3163 // we don't set the name of an attached thread to avoid stepping
3164 // on other programs
3165 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3166 os::set_native_thread_name(thread_name);
3167 }
3168 JVM_END
3169
3170 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3171
3172 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3173 assert(jthread->is_Java_thread(), "must be a Java thread");
3174 if (jthread->privileged_stack_top() == NULL) return false;
3175 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3176 oop loader = jthread->privileged_stack_top()->class_loader();
3177 if (loader == NULL) return true;
3178 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3179 if (trusted) return true;
3180 }
3181 return false;
3182 }
3183
3184 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3185 JVMWrapper("JVM_CurrentLoadedClass");
3186 ResourceMark rm(THREAD);
3187
3188 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3189 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3190 bool trusted = is_trusted_frame(thread, &vfst);
3191 if (trusted) return NULL;
3192
3193 Method* m = vfst.method();
3194 if (!m->is_native()) {
3195 InstanceKlass* holder = m->method_holder();
3196 oop loader = holder->class_loader();
3197 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3198 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3199 }
3200 }
3201 }
3202 return NULL;
3203 JVM_END
3204
3205
3206 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3207 JVMWrapper("JVM_CurrentClassLoader");
3208 ResourceMark rm(THREAD);
3209
3210 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3211
3212 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3213 bool trusted = is_trusted_frame(thread, &vfst);
3214 if (trusted) return NULL;
3215
3216 Method* m = vfst.method();
3217 if (!m->is_native()) {
3218 InstanceKlass* holder = m->method_holder();
3219 assert(holder->is_klass(), "just checking");
3220 oop loader = holder->class_loader();
3221 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3222 return JNIHandles::make_local(env, loader);
3223 }
3224 }
3225 }
3226 return NULL;
3227 JVM_END
3228
3229
3230 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3231 JVMWrapper("JVM_GetClassContext");
3232 ResourceMark rm(THREAD);
3233 JvmtiVMObjectAllocEventCollector oam;
3234 vframeStream vfst(thread);
3235
3236 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3237 // This must only be called from SecurityManager.getClassContext
3238 Method* m = vfst.method();
3239 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3240 m->name() == vmSymbols::getClassContext_name() &&
3241 m->signature() == vmSymbols::void_class_array_signature())) {
3242 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3243 }
3244 }
3245
3246 // Collect method holders
3247 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3248 for (; !vfst.at_end(); vfst.security_next()) {
3249 Method* m = vfst.method();
3250 // Native frames are not returned
3251 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3252 Klass* holder = m->method_holder();
3253 assert(holder->is_klass(), "just checking");
3254 klass_array->append(holder);
3255 }
3256 }
3257
3258 // Create result array of type [Ljava/lang/Class;
3259 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3260 // Fill in mirrors corresponding to method holders
3261 for (int i = 0; i < klass_array->length(); i++) {
3262 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3263 }
3264
3265 return (jobjectArray) JNIHandles::make_local(env, result);
3266 JVM_END
3267
3268
3269 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3270 JVMWrapper("JVM_ClassDepth");
3271 ResourceMark rm(THREAD);
3272 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3273 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3274
3275 const char* str = java_lang_String::as_utf8_string(class_name_str());
3276 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3277 if (class_name_sym == NULL) {
3278 return -1;
3279 }
3280
3281 int depth = 0;
3282
3283 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3284 if (!vfst.method()->is_native()) {
3285 InstanceKlass* holder = vfst.method()->method_holder();
3286 assert(holder->is_klass(), "just checking");
3287 if (holder->name() == class_name_sym) {
3288 return depth;
3289 }
3290 depth++;
3291 }
3292 }
3293 return -1;
3294 JVM_END
3295
3296
3297 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3298 JVMWrapper("JVM_ClassLoaderDepth");
3299 ResourceMark rm(THREAD);
3300 int depth = 0;
3301 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3302 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3303 bool trusted = is_trusted_frame(thread, &vfst);
3304 if (trusted) return -1;
3305
3306 Method* m = vfst.method();
3307 if (!m->is_native()) {
3308 InstanceKlass* holder = m->method_holder();
3309 assert(holder->is_klass(), "just checking");
3310 oop loader = holder->class_loader();
3311 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3312 return depth;
3313 }
3314 depth++;
3315 }
3316 }
3317 return -1;
3318 JVM_END
3319
3320
3321 // java.lang.Package ////////////////////////////////////////////////////////////////
3322
3323
3324 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3325 JVMWrapper("JVM_GetSystemPackage");
3326 ResourceMark rm(THREAD);
3327 JvmtiVMObjectAllocEventCollector oam;
3328 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3329 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3330 return (jstring) JNIHandles::make_local(result);
3331 JVM_END
3332
3333
3334 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3335 JVMWrapper("JVM_GetSystemPackages");
3336 JvmtiVMObjectAllocEventCollector oam;
3337 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3338 return (jobjectArray) JNIHandles::make_local(result);
3339 JVM_END
3340
3341
3342 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3343
3344
3345 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3346 JVMWrapper("JVM_GetAndClearReferencePendingList");
3347
3348 MonitorLockerEx ml(Heap_lock);
3349 oop ref = Universe::reference_pending_list();
3350 if (ref != NULL) {
3351 Universe::set_reference_pending_list(NULL);
3352 }
3353 return JNIHandles::make_local(env, ref);
3354 JVM_END
3355
3356 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3357 JVMWrapper("JVM_HasReferencePendingList");
3358 MonitorLockerEx ml(Heap_lock);
3359 return Universe::has_reference_pending_list();
3360 JVM_END
3361
3362 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3363 JVMWrapper("JVM_WaitForReferencePendingList");
3364 MonitorLockerEx ml(Heap_lock);
3365 while (!Universe::has_reference_pending_list()) {
3366 ml.wait();
3367 }
3368 JVM_END
3369
3370
3371 // ObjectInputStream ///////////////////////////////////////////////////////////////
3372
3373 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3374 if (current_class == NULL) {
3375 return true;
3376 }
3377 if ((current_class == field_class) || access.is_public()) {
3378 return true;
3379 }
3380
3381 if (access.is_protected()) {
3382 // See if current_class is a subclass of field_class
3383 if (current_class->is_subclass_of(field_class)) {
3384 return true;
3385 }
3386 }
3387
3388 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3389 }
3390
3391 // Return the first user-defined class loader up the execution stack, or null
3392 // if only code from the bootstrap or platform class loader is on the stack.
3393
3394 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3395 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3396 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3397 oop loader = vfst.method()->method_holder()->class_loader();
3398 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3399 return JNIHandles::make_local(env, loader);
3400 }
3401 }
3402 return NULL;
3403 JVM_END
3404
3405
3406 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3407
3408
3409 // resolve array handle and check arguments
3410 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3411 if (arr == NULL) {
3412 THROW_0(vmSymbols::java_lang_NullPointerException());
3413 }
3414 oop a = JNIHandles::resolve_non_null(arr);
3415 if (!a->is_array()) {
3416 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3417 } else if (type_array_only && !a->is_typeArray()) {
3418 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3419 }
3420 return arrayOop(a);
3421 }
3422
3423
3424 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3425 JVMWrapper("JVM_GetArrayLength");
3426 arrayOop a = check_array(env, arr, false, CHECK_0);
3427 return a->length();
3428 JVM_END
3429
3430
3431 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3432 JVMWrapper("JVM_Array_Get");
3433 JvmtiVMObjectAllocEventCollector oam;
3434 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3435 jvalue value;
3436 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3437 oop box = Reflection::box(&value, type, CHECK_NULL);
3438 return JNIHandles::make_local(env, box);
3439 JVM_END
3440
3441
3442 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3443 JVMWrapper("JVM_GetPrimitiveArrayElement");
3444 jvalue value;
3445 value.i = 0; // to initialize value before getting used in CHECK
3446 arrayOop a = check_array(env, arr, true, CHECK_(value));
3447 assert(a->is_typeArray(), "just checking");
3448 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3449 BasicType wide_type = (BasicType) wCode;
3450 if (type != wide_type) {
3451 Reflection::widen(&value, type, wide_type, CHECK_(value));
3452 }
3453 return value;
3454 JVM_END
3455
3456
3457 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3458 JVMWrapper("JVM_SetArrayElement");
3459 arrayOop a = check_array(env, arr, false, CHECK);
3460 oop box = JNIHandles::resolve(val);
3461 jvalue value;
3462 value.i = 0; // to initialize value before getting used in CHECK
3463 BasicType value_type;
3464 if (a->is_objArray()) {
3465 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3466 value_type = Reflection::unbox_for_regular_object(box, &value);
3467 } else {
3468 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3469 }
3470 Reflection::array_set(&value, a, index, value_type, CHECK);
3471 JVM_END
3472
3473
3474 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3475 JVMWrapper("JVM_SetPrimitiveArrayElement");
3476 arrayOop a = check_array(env, arr, true, CHECK);
3477 assert(a->is_typeArray(), "just checking");
3478 BasicType value_type = (BasicType) vCode;
3479 Reflection::array_set(&v, a, index, value_type, CHECK);
3480 JVM_END
3481
3482
3483 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3484 JVMWrapper("JVM_NewArray");
3485 JvmtiVMObjectAllocEventCollector oam;
3486 oop element_mirror = JNIHandles::resolve(eltClass);
3487 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3488 return JNIHandles::make_local(env, result);
3489 JVM_END
3490
3491
3492 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3493 JVMWrapper("JVM_NewMultiArray");
3494 JvmtiVMObjectAllocEventCollector oam;
3495 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3496 oop element_mirror = JNIHandles::resolve(eltClass);
3497 assert(dim_array->is_typeArray(), "just checking");
3498 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3499 return JNIHandles::make_local(env, result);
3500 JVM_END
3501
3502
3503 // Library support ///////////////////////////////////////////////////////////////////////////
3504
3505 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3506 //%note jvm_ct
3507 JVMWrapper("JVM_LoadLibrary");
3508 char ebuf[1024];
3509 void *load_result;
3510 {
3511 ThreadToNativeFromVM ttnfvm(thread);
3512 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3513 }
3514 if (load_result == NULL) {
3515 char msg[1024];
3516 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3517 // Since 'ebuf' may contain a string encoded using
3518 // platform encoding scheme, we need to pass
3519 // Exceptions::unsafe_to_utf8 to the new_exception method
3520 // as the last argument. See bug 6367357.
3521 Handle h_exception =
3522 Exceptions::new_exception(thread,
3523 vmSymbols::java_lang_UnsatisfiedLinkError(),
3524 msg, Exceptions::unsafe_to_utf8);
3525
3526 THROW_HANDLE_0(h_exception);
3527 }
3528 return load_result;
3529 JVM_END
3530
3531
3532 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3533 JVMWrapper("JVM_UnloadLibrary");
3534 os::dll_unload(handle);
3535 JVM_END
3536
3537
3538 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3539 JVMWrapper("JVM_FindLibraryEntry");
3540 return os::dll_lookup(handle, name);
3541 JVM_END
3542
3543
3544 // JNI version ///////////////////////////////////////////////////////////////////////////////
3545
3546 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3547 JVMWrapper("JVM_IsSupportedJNIVersion");
3548 return Threads::is_supported_jni_version_including_1_1(version);
3549 JVM_END
3550
3551
3552 // String support ///////////////////////////////////////////////////////////////////////////
3553
3554 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3555 JVMWrapper("JVM_InternString");
3556 JvmtiVMObjectAllocEventCollector oam;
3557 if (str == NULL) return NULL;
3558 oop string = JNIHandles::resolve_non_null(str);
3559 oop result = StringTable::intern(string, CHECK_NULL);
3560 return (jstring) JNIHandles::make_local(env, result);
3561 JVM_END
3562
3563
3564 // Raw monitor support //////////////////////////////////////////////////////////////////////
3565
3566 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3567 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3568 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3569 // that only works with java threads.
3570
3571
3572 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3573 VM_Exit::block_if_vm_exited();
3574 JVMWrapper("JVM_RawMonitorCreate");
3575 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3576 }
3577
3578
3579 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3580 VM_Exit::block_if_vm_exited();
3581 JVMWrapper("JVM_RawMonitorDestroy");
3582 delete ((Mutex*) mon);
3583 }
3584
3585
3586 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3587 VM_Exit::block_if_vm_exited();
3588 JVMWrapper("JVM_RawMonitorEnter");
3589 ((Mutex*) mon)->jvm_raw_lock();
3590 return 0;
3591 }
3592
3593
3594 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3595 VM_Exit::block_if_vm_exited();
3596 JVMWrapper("JVM_RawMonitorExit");
3597 ((Mutex*) mon)->jvm_raw_unlock();
3598 }
3599
3600
3601 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3602
3603 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3604 Handle loader, Handle protection_domain,
3605 jboolean throwError, TRAPS) {
3606 // Security Note:
3607 // The Java level wrapper will perform the necessary security check allowing
3608 // us to pass the NULL as the initiating class loader. The VM is responsible for
3609 // the checkPackageAccess relative to the initiating class loader via the
3610 // protection_domain. The protection_domain is passed as NULL by the java code
3611 // if there is no security manager in 3-arg Class.forName().
3612 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3613
3614 KlassHandle klass_handle(THREAD, klass);
3615 // Check if we should initialize the class
3616 if (init && klass_handle->is_instance_klass()) {
3617 klass_handle->initialize(CHECK_NULL);
3618 }
3619 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
3620 }
3621
3622
3623 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3624
3625 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3626 JVMWrapper("JVM_InvokeMethod");
3627 Handle method_handle;
3628 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3629 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3630 Handle receiver(THREAD, JNIHandles::resolve(obj));
3631 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3632 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3633 jobject res = JNIHandles::make_local(env, result);
3634 if (JvmtiExport::should_post_vm_object_alloc()) {
3635 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3636 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3637 if (java_lang_Class::is_primitive(ret_type)) {
3638 // Only for primitive type vm allocates memory for java object.
3639 // See box() method.
3640 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3641 }
3642 }
3643 return res;
3644 } else {
3645 THROW_0(vmSymbols::java_lang_StackOverflowError());
3646 }
3647 JVM_END
3648
3649
3650 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3651 JVMWrapper("JVM_NewInstanceFromConstructor");
3652 oop constructor_mirror = JNIHandles::resolve(c);
3653 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3654 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3655 jobject res = JNIHandles::make_local(env, result);
3656 if (JvmtiExport::should_post_vm_object_alloc()) {
3657 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3658 }
3659 return res;
3660 JVM_END
3661
3662 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3663
3664 JVM_LEAF(jboolean, JVM_SupportsCX8())
3665 JVMWrapper("JVM_SupportsCX8");
3666 return VM_Version::supports_cx8();
3667 JVM_END
3668
3669 // Returns an array of all live Thread objects (VM internal JavaThreads,
3670 // jvmti agent threads, and JNI attaching threads are skipped)
3671 // See CR 6404306 regarding JNI attaching threads
3672 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3673 ResourceMark rm(THREAD);
3674 ThreadsListEnumerator tle(THREAD, false, false);
3675 JvmtiVMObjectAllocEventCollector oam;
3676
3677 int num_threads = tle.num_threads();
3678 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3679 objArrayHandle threads_ah(THREAD, r);
3680
3681 for (int i = 0; i < num_threads; i++) {
3682 Handle h = tle.get_threadObj(i);
3683 threads_ah->obj_at_put(i, h());
3684 }
3685
3686 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3687 JVM_END
3688
3689
3690 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3691 // Return StackTraceElement[][], each element is the stack trace of a thread in
3692 // the corresponding entry in the given threads array
3693 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3694 JVMWrapper("JVM_DumpThreads");
3695 JvmtiVMObjectAllocEventCollector oam;
3696
3697 // Check if threads is null
3698 if (threads == NULL) {
3699 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3700 }
3701
3702 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3703 objArrayHandle ah(THREAD, a);
3704 int num_threads = ah->length();
3705 // check if threads is non-empty array
3706 if (num_threads == 0) {
3707 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3708 }
3709
3710 // check if threads is not an array of objects of Thread class
3711 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3712 if (k != SystemDictionary::Thread_klass()) {
3713 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3714 }
3715
3716 ResourceMark rm(THREAD);
3717
3718 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3719 for (int i = 0; i < num_threads; i++) {
3720 oop thread_obj = ah->obj_at(i);
3721 instanceHandle h(THREAD, (instanceOop) thread_obj);
3722 thread_handle_array->append(h);
3723 }
3724
3725 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3726 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3727
3728 JVM_END
3729
3730 // JVM monitoring and management support
3731 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3732 return Management::get_jmm_interface(version);
3733 JVM_END
3734
3735 // com.sun.tools.attach.VirtualMachine agent properties support
3736 //
3737 // Initialize the agent properties with the properties maintained in the VM
3738 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3739 JVMWrapper("JVM_InitAgentProperties");
3740 ResourceMark rm;
3741
3742 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3743
3744 PUTPROP(props, "sun.java.command", Arguments::java_command());
3745 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3746 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3747 return properties;
3748 JVM_END
3749
3750 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3751 {
3752 JVMWrapper("JVM_GetEnclosingMethodInfo");
3753 JvmtiVMObjectAllocEventCollector oam;
3754
3755 if (ofClass == NULL) {
3756 return NULL;
3757 }
3758 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3759 // Special handling for primitive objects
3760 if (java_lang_Class::is_primitive(mirror())) {
3761 return NULL;
3762 }
3763 Klass* k = java_lang_Class::as_Klass(mirror());
3764 if (!k->is_instance_klass()) {
3765 return NULL;
3766 }
3767 instanceKlassHandle ik_h(THREAD, k);
3768 int encl_method_class_idx = ik_h->enclosing_method_class_index();
3769 if (encl_method_class_idx == 0) {
3770 return NULL;
3771 }
3772 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3773 objArrayHandle dest(THREAD, dest_o);
3774 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3775 dest->obj_at_put(0, enc_k->java_mirror());
3776 int encl_method_method_idx = ik_h->enclosing_method_method_index();
3777 if (encl_method_method_idx != 0) {
3778 Symbol* sym = ik_h->constants()->symbol_at(
3779 extract_low_short_from_int(
3780 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3781 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3782 dest->obj_at_put(1, str());
3783 sym = ik_h->constants()->symbol_at(
3784 extract_high_short_from_int(
3785 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3786 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3787 dest->obj_at_put(2, str());
3788 }
3789 return (jobjectArray) JNIHandles::make_local(dest());
3790 }
3791 JVM_END
3792
3793 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3794 {
3795 memset(info, 0, info_size);
3796
3797 info->jvm_version = Abstract_VM_Version::jvm_version();
3798 info->patch_version = Abstract_VM_Version::vm_patch_version();
3799
3800 // when we add a new capability in the jvm_version_info struct, we should also
3801 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3802 // counter defined in runtimeService.cpp.
3803 info->is_attachable = AttachListener::is_attach_supported();
3804 }
3805 JVM_END
3806
3807 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3808 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3809 ResourceMark rm(THREAD);
3810
3811 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3812 return NULL;
3813 }
3814
3815 char** vm_flags = Arguments::jvm_flags_array();
3816 char** vm_args = Arguments::jvm_args_array();
3817 int num_flags = Arguments::num_jvm_flags();
3818 int num_args = Arguments::num_jvm_args();
3819
3820 instanceKlassHandle ik (THREAD, SystemDictionary::String_klass());
3821 objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL);
3822 objArrayHandle result_h(THREAD, r);
3823
3824 int index = 0;
3825 for (int j = 0; j < num_flags; j++, index++) {
3826 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3827 result_h->obj_at_put(index, h());
3828 }
3829 for (int i = 0; i < num_args; i++, index++) {
3830 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3831 result_h->obj_at_put(index, h());
3832 }
3833 return (jobjectArray) JNIHandles::make_local(env, result_h());
3834 JVM_END
3835
3836 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3837 return os::get_signal_number(name);
3838 JVM_END