1 /*
2 * Copyright (c) 1997, 2016, 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 GC::gc()->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 GC::gc()->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 = GC::gc()->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 = GC::gc()->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 = GC::gc()->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 = GC::gc()->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());
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, jstring version, jstring location,
1012 jobjectArray packages))
1013 JVMWrapper("JVM_DefineModule");
1014 Modules::define_module(module, version, location, 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, jstring 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, jstring 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, jstring 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(jboolean, JVM_CanReadModule(JNIEnv *env, jobject asking_module, jobject source_module))
1043 JVMWrapper("JVM_CanReadModule");
1044 return Modules::can_read_module(asking_module, source_module, THREAD);
1045 JVM_END
1046
1047 JVM_ENTRY(jboolean, JVM_IsExportedToModule(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1048 JVMWrapper("JVM_IsExportedToModule");
1049 return Modules::is_exported_to_module(from_module, package, to_module, THREAD);
1050 JVM_END
1051
1052 JVM_ENTRY (void, JVM_AddModulePackage(JNIEnv *env, jobject module, jstring package))
1053 JVMWrapper("JVM_AddModulePackage");
1054 Modules::add_module_package(module, package, CHECK);
1055 JVM_END
1056
1057 JVM_ENTRY (jobject, JVM_GetModuleByPackageName(JNIEnv *env, jobject loader, jstring package))
1058 JVMWrapper("JVM_GetModuleByPackageName");
1059 return Modules::get_module_by_package_name(loader, package, THREAD);
1060 JVM_END
1061
1062 // Reflection support //////////////////////////////////////////////////////////////////////////////
1063
1064 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1065 assert (cls != NULL, "illegal class");
1066 JVMWrapper("JVM_GetClassName");
1067 JvmtiVMObjectAllocEventCollector oam;
1068 ResourceMark rm(THREAD);
1069 const char* name;
1070 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1071 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1072 } else {
1073 // Consider caching interned string in Klass
1074 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1075 assert(k->is_klass(), "just checking");
1076 name = k->external_name();
1077 }
1078 oop result = StringTable::intern((char*) name, CHECK_NULL);
1079 return (jstring) JNIHandles::make_local(env, result);
1080 JVM_END
1081
1082
1083 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1084 JVMWrapper("JVM_GetClassInterfaces");
1085 JvmtiVMObjectAllocEventCollector oam;
1086 oop mirror = JNIHandles::resolve_non_null(cls);
1087
1088 // Special handling for primitive objects
1089 if (java_lang_Class::is_primitive(mirror)) {
1090 // Primitive objects does not have any interfaces
1091 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1092 return (jobjectArray) JNIHandles::make_local(env, r);
1093 }
1094
1095 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
1096 // Figure size of result array
1097 int size;
1098 if (klass->is_instance_klass()) {
1099 size = InstanceKlass::cast(klass())->local_interfaces()->length();
1100 } else {
1101 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1102 size = 2;
1103 }
1104
1105 // Allocate result array
1106 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1107 objArrayHandle result (THREAD, r);
1108 // Fill in result
1109 if (klass->is_instance_klass()) {
1110 // Regular instance klass, fill in all local interfaces
1111 for (int index = 0; index < size; index++) {
1112 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
1113 result->obj_at_put(index, k->java_mirror());
1114 }
1115 } else {
1116 // All arrays implement java.lang.Cloneable and java.io.Serializable
1117 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1118 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1119 }
1120 return (jobjectArray) JNIHandles::make_local(env, result());
1121 JVM_END
1122
1123
1124 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1125 JVMWrapper("JVM_IsInterface");
1126 oop mirror = JNIHandles::resolve_non_null(cls);
1127 if (java_lang_Class::is_primitive(mirror)) {
1128 return JNI_FALSE;
1129 }
1130 Klass* k = java_lang_Class::as_Klass(mirror);
1131 jboolean result = k->is_interface();
1132 assert(!result || k->is_instance_klass(),
1133 "all interfaces are instance types");
1134 // The compiler intrinsic for isInterface tests the
1135 // Klass::_access_flags bits in the same way.
1136 return result;
1137 JVM_END
1138
1139
1140 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1141 JVMWrapper("JVM_GetClassSigners");
1142 JvmtiVMObjectAllocEventCollector oam;
1143 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1144 // There are no signers for primitive types
1145 return NULL;
1146 }
1147
1148 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1149
1150 // If there are no signers set in the class, or if the class
1151 // is an array, return NULL.
1152 if (signers == NULL) return NULL;
1153
1154 // copy of the signers array
1155 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1156 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1157 for (int index = 0; index < signers->length(); index++) {
1158 signers_copy->obj_at_put(index, signers->obj_at(index));
1159 }
1160
1161 // return the copy
1162 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1163 JVM_END
1164
1165
1166 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1167 JVMWrapper("JVM_SetClassSigners");
1168 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1169 // This call is ignored for primitive types and arrays.
1170 // Signers are only set once, ClassLoader.java, and thus shouldn't
1171 // be called with an array. Only the bootstrap loader creates arrays.
1172 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1173 if (k->is_instance_klass()) {
1174 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1175 }
1176 }
1177 JVM_END
1178
1179
1180 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1181 JVMWrapper("JVM_GetProtectionDomain");
1182 if (JNIHandles::resolve(cls) == NULL) {
1183 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1184 }
1185
1186 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1187 // Primitive types does not have a protection domain.
1188 return NULL;
1189 }
1190
1191 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1192 return (jobject) JNIHandles::make_local(env, pd);
1193 JVM_END
1194
1195
1196 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1197 // If there is a security manager and protection domain, check the access
1198 // in the protection domain, otherwise it is authorized.
1199 if (java_lang_System::has_security_manager()) {
1200
1201 // For bootstrapping, if pd implies method isn't in the JDK, allow
1202 // this context to revert to older behavior.
1203 // In this case the isAuthorized field in AccessControlContext is also not
1204 // present.
1205 if (Universe::protection_domain_implies_method() == NULL) {
1206 return true;
1207 }
1208
1209 // Whitelist certain access control contexts
1210 if (java_security_AccessControlContext::is_authorized(context)) {
1211 return true;
1212 }
1213
1214 oop prot = klass->protection_domain();
1215 if (prot != NULL) {
1216 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1217 // in the new wrapper.
1218 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1219 Handle h_prot(THREAD, prot);
1220 JavaValue result(T_BOOLEAN);
1221 JavaCallArguments args(h_prot);
1222 JavaCalls::call(&result, m, &args, CHECK_false);
1223 return (result.get_jboolean() != 0);
1224 }
1225 }
1226 return true;
1227 }
1228
1229 // Create an AccessControlContext with a protection domain with null codesource
1230 // and null permissions - which gives no permissions.
1231 oop create_dummy_access_control_context(TRAPS) {
1232 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1233 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1234 // Call constructor ProtectionDomain(null, null);
1235 JavaValue result(T_VOID);
1236 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1237 vmSymbols::object_initializer_name(),
1238 vmSymbols::codesource_permissioncollection_signature(),
1239 Handle(), Handle(), CHECK_NULL);
1240
1241 // new ProtectionDomain[] {pd};
1242 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1243 context->obj_at_put(0, obj());
1244
1245 // new AccessControlContext(new ProtectionDomain[] {pd})
1246 objArrayHandle h_context(THREAD, context);
1247 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1248 return acc;
1249 }
1250
1251 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1252 JVMWrapper("JVM_DoPrivileged");
1253
1254 if (action == NULL) {
1255 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1256 }
1257
1258 // Compute the frame initiating the do privileged operation and setup the privileged stack
1259 vframeStream vfst(thread);
1260 vfst.security_get_caller_frame(1);
1261
1262 if (vfst.at_end()) {
1263 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1264 }
1265
1266 Method* method = vfst.method();
1267 instanceKlassHandle klass (THREAD, method->method_holder());
1268
1269 // Check that action object understands "Object run()"
1270 Handle h_context;
1271 if (context != NULL) {
1272 h_context = Handle(THREAD, JNIHandles::resolve(context));
1273 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1274 if (!authorized) {
1275 // Create an unprivileged access control object and call it's run function
1276 // instead.
1277 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1278 h_context = Handle(THREAD, noprivs);
1279 }
1280 }
1281
1282 // Check that action object understands "Object run()"
1283 Handle object (THREAD, JNIHandles::resolve(action));
1284
1285 // get run() method
1286 Method* m_oop = object->klass()->uncached_lookup_method(
1287 vmSymbols::run_method_name(),
1288 vmSymbols::void_object_signature(),
1289 Klass::find_overpass);
1290 methodHandle m (THREAD, m_oop);
1291 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1292 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1293 }
1294
1295 // Stack allocated list of privileged stack elements
1296 PrivilegedElement pi;
1297 if (!vfst.at_end()) {
1298 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1299 thread->set_privileged_stack_top(&pi);
1300 }
1301
1302
1303 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1304 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1305 Handle pending_exception;
1306 JavaValue result(T_OBJECT);
1307 JavaCallArguments args(object);
1308 JavaCalls::call(&result, m, &args, THREAD);
1309
1310 // done with action, remove ourselves from the list
1311 if (!vfst.at_end()) {
1312 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1313 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1314 }
1315
1316 if (HAS_PENDING_EXCEPTION) {
1317 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1318 CLEAR_PENDING_EXCEPTION;
1319 // JVMTI has already reported the pending exception
1320 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1321 if (THREAD->is_Java_thread()) {
1322 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1323 }
1324 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1325 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1326 // Throw a java.security.PrivilegedActionException(Exception e) exception
1327 JavaCallArguments args(pending_exception);
1328 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1329 vmSymbols::exception_void_signature(),
1330 &args);
1331 }
1332 }
1333
1334 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1335 return JNIHandles::make_local(env, (oop) result.get_jobject());
1336 JVM_END
1337
1338
1339 // Returns the inherited_access_control_context field of the running thread.
1340 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1341 JVMWrapper("JVM_GetInheritedAccessControlContext");
1342 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1343 return JNIHandles::make_local(env, result);
1344 JVM_END
1345
1346 class RegisterArrayForGC {
1347 private:
1348 JavaThread *_thread;
1349 public:
1350 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1351 _thread = thread;
1352 _thread->register_array_for_gc(array);
1353 }
1354
1355 ~RegisterArrayForGC() {
1356 _thread->register_array_for_gc(NULL);
1357 }
1358 };
1359
1360
1361 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1362 JVMWrapper("JVM_GetStackAccessControlContext");
1363 if (!UsePrivilegedStack) return NULL;
1364
1365 ResourceMark rm(THREAD);
1366 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1367 JvmtiVMObjectAllocEventCollector oam;
1368
1369 // count the protection domains on the execution stack. We collapse
1370 // duplicate consecutive protection domains into a single one, as
1371 // well as stopping when we hit a privileged frame.
1372
1373 // Use vframeStream to iterate through Java frames
1374 vframeStream vfst(thread);
1375
1376 oop previous_protection_domain = NULL;
1377 Handle privileged_context(thread, NULL);
1378 bool is_privileged = false;
1379 oop protection_domain = NULL;
1380
1381 for(; !vfst.at_end(); vfst.next()) {
1382 // get method of frame
1383 Method* method = vfst.method();
1384 intptr_t* frame_id = vfst.frame_id();
1385
1386 // check the privileged frames to see if we have a match
1387 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1388 // this frame is privileged
1389 is_privileged = true;
1390 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1391 protection_domain = thread->privileged_stack_top()->protection_domain();
1392 } else {
1393 protection_domain = method->method_holder()->protection_domain();
1394 }
1395
1396 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1397 local_array->push(protection_domain);
1398 previous_protection_domain = protection_domain;
1399 }
1400
1401 if (is_privileged) break;
1402 }
1403
1404
1405 // either all the domains on the stack were system domains, or
1406 // we had a privileged system domain
1407 if (local_array->is_empty()) {
1408 if (is_privileged && privileged_context.is_null()) return NULL;
1409
1410 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1411 return JNIHandles::make_local(env, result);
1412 }
1413
1414 // the resource area must be registered in case of a gc
1415 RegisterArrayForGC ragc(thread, local_array);
1416 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1417 local_array->length(), CHECK_NULL);
1418 objArrayHandle h_context(thread, context);
1419 for (int index = 0; index < local_array->length(); index++) {
1420 h_context->obj_at_put(index, local_array->at(index));
1421 }
1422
1423 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1424
1425 return JNIHandles::make_local(env, result);
1426 JVM_END
1427
1428
1429 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1430 JVMWrapper("JVM_IsArrayClass");
1431 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1432 return (k != NULL) && k->is_array_klass() ? true : false;
1433 JVM_END
1434
1435
1436 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1437 JVMWrapper("JVM_IsPrimitiveClass");
1438 oop mirror = JNIHandles::resolve_non_null(cls);
1439 return (jboolean) java_lang_Class::is_primitive(mirror);
1440 JVM_END
1441
1442
1443 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1444 JVMWrapper("JVM_GetClassModifiers");
1445 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1446 // Primitive type
1447 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1448 }
1449
1450 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1451 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1452 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1453 return k->modifier_flags();
1454 JVM_END
1455
1456
1457 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1458
1459 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1460 JvmtiVMObjectAllocEventCollector oam;
1461 // ofClass is a reference to a java_lang_Class object. The mirror object
1462 // of an InstanceKlass
1463
1464 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1465 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1466 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1467 return (jobjectArray)JNIHandles::make_local(env, result);
1468 }
1469
1470 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1471 InnerClassesIterator iter(k);
1472
1473 if (iter.length() == 0) {
1474 // Neither an inner nor outer class
1475 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1476 return (jobjectArray)JNIHandles::make_local(env, result);
1477 }
1478
1479 // find inner class info
1480 constantPoolHandle cp(thread, k->constants());
1481 int length = iter.length();
1482
1483 // Allocate temp. result array
1484 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1485 objArrayHandle result (THREAD, r);
1486 int members = 0;
1487
1488 for (; !iter.done(); iter.next()) {
1489 int ioff = iter.inner_class_info_index();
1490 int ooff = iter.outer_class_info_index();
1491
1492 if (ioff != 0 && ooff != 0) {
1493 // Check to see if the name matches the class we're looking for
1494 // before attempting to find the class.
1495 if (cp->klass_name_at_matches(k, ooff)) {
1496 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1497 if (outer_klass == k()) {
1498 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1499 instanceKlassHandle inner_klass (THREAD, ik);
1500
1501 // Throws an exception if outer klass has not declared k as
1502 // an inner klass
1503 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1504
1505 result->obj_at_put(members, inner_klass->java_mirror());
1506 members++;
1507 }
1508 }
1509 }
1510 }
1511
1512 if (members != length) {
1513 // Return array of right length
1514 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1515 for(int i = 0; i < members; i++) {
1516 res->obj_at_put(i, result->obj_at(i));
1517 }
1518 return (jobjectArray)JNIHandles::make_local(env, res);
1519 }
1520
1521 return (jobjectArray)JNIHandles::make_local(env, result());
1522 JVM_END
1523
1524
1525 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1526 {
1527 // ofClass is a reference to a java_lang_Class object.
1528 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1529 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1530 return NULL;
1531 }
1532
1533 bool inner_is_member = false;
1534 Klass* outer_klass
1535 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1536 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1537 if (outer_klass == NULL) return NULL; // already a top-level class
1538 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1539 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1540 }
1541 JVM_END
1542
1543 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1544 {
1545 oop mirror = JNIHandles::resolve_non_null(cls);
1546 if (java_lang_Class::is_primitive(mirror) ||
1547 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1548 return NULL;
1549 }
1550 instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror)));
1551 int ooff = 0, noff = 0;
1552 if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) {
1553 if (noff != 0) {
1554 constantPoolHandle i_cp(thread, k->constants());
1555 Symbol* name = i_cp->symbol_at(noff);
1556 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1557 return (jstring) JNIHandles::make_local(env, str());
1558 }
1559 }
1560 return NULL;
1561 }
1562 JVM_END
1563
1564 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1565 assert (cls != NULL, "illegal class");
1566 JVMWrapper("JVM_GetClassSignature");
1567 JvmtiVMObjectAllocEventCollector oam;
1568 ResourceMark rm(THREAD);
1569 // Return null for arrays and primatives
1570 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1572 if (k->is_instance_klass()) {
1573 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1574 if (sym == NULL) return NULL;
1575 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1576 return (jstring) JNIHandles::make_local(env, str());
1577 }
1578 }
1579 return NULL;
1580 JVM_END
1581
1582
1583 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1584 assert (cls != NULL, "illegal class");
1585 JVMWrapper("JVM_GetClassAnnotations");
1586
1587 // Return null for arrays and primitives
1588 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1589 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1590 if (k->is_instance_klass()) {
1591 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1592 return (jbyteArray) JNIHandles::make_local(env, a);
1593 }
1594 }
1595 return NULL;
1596 JVM_END
1597
1598
1599 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1600 // some of this code was adapted from from jni_FromReflectedField
1601
1602 oop reflected = JNIHandles::resolve_non_null(field);
1603 oop mirror = java_lang_reflect_Field::clazz(reflected);
1604 Klass* k = java_lang_Class::as_Klass(mirror);
1605 int slot = java_lang_reflect_Field::slot(reflected);
1606 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1607
1608 KlassHandle kh(THREAD, k);
1609 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1610
1611 if (modifiers & JVM_ACC_STATIC) {
1612 // for static fields we only look in the current class
1613 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1614 assert(false, "cannot find static field");
1615 return false;
1616 }
1617 } else {
1618 // for instance fields we start with the current class and work
1619 // our way up through the superclass chain
1620 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1621 assert(false, "cannot find instance field");
1622 return false;
1623 }
1624 }
1625 return true;
1626 }
1627
1628 static Method* jvm_get_method_common(jobject method) {
1629 // some of this code was adapted from from jni_FromReflectedMethod
1630
1631 oop reflected = JNIHandles::resolve_non_null(method);
1632 oop mirror = NULL;
1633 int slot = 0;
1634
1635 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1636 mirror = java_lang_reflect_Constructor::clazz(reflected);
1637 slot = java_lang_reflect_Constructor::slot(reflected);
1638 } else {
1639 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1640 "wrong type");
1641 mirror = java_lang_reflect_Method::clazz(reflected);
1642 slot = java_lang_reflect_Method::slot(reflected);
1643 }
1644 Klass* k = java_lang_Class::as_Klass(mirror);
1645
1646 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1647 assert(m != NULL, "cannot find method");
1648 return m; // caller has to deal with NULL in product mode
1649 }
1650
1651 /* Type use annotations support (JDK 1.8) */
1652
1653 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1654 assert (cls != NULL, "illegal class");
1655 JVMWrapper("JVM_GetClassTypeAnnotations");
1656 ResourceMark rm(THREAD);
1657 // Return null for arrays and primitives
1658 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1659 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1660 if (k->is_instance_klass()) {
1661 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1662 if (type_annotations != NULL) {
1663 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1664 return (jbyteArray) JNIHandles::make_local(env, a);
1665 }
1666 }
1667 }
1668 return NULL;
1669 JVM_END
1670
1671 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1672 assert (method != NULL, "illegal method");
1673 JVMWrapper("JVM_GetMethodTypeAnnotations");
1674
1675 // method is a handle to a java.lang.reflect.Method object
1676 Method* m = jvm_get_method_common(method);
1677 if (m == NULL) {
1678 return NULL;
1679 }
1680
1681 AnnotationArray* type_annotations = m->type_annotations();
1682 if (type_annotations != NULL) {
1683 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1684 return (jbyteArray) JNIHandles::make_local(env, a);
1685 }
1686
1687 return NULL;
1688 JVM_END
1689
1690 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1691 assert (field != NULL, "illegal field");
1692 JVMWrapper("JVM_GetFieldTypeAnnotations");
1693
1694 fieldDescriptor fd;
1695 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1696 if (!gotFd) {
1697 return NULL;
1698 }
1699
1700 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1701 JVM_END
1702
1703 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1704 if (!cp->is_within_bounds(index)) {
1705 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1706 }
1707 }
1708
1709 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1710 {
1711 JVMWrapper("JVM_GetMethodParameters");
1712 // method is a handle to a java.lang.reflect.Method object
1713 Method* method_ptr = jvm_get_method_common(method);
1714 methodHandle mh (THREAD, method_ptr);
1715 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1716 const int num_params = mh->method_parameters_length();
1717
1718 if (num_params < 0) {
1719 // A -1 return value from method_parameters_length means there is no
1720 // parameter data. Return null to indicate this to the reflection
1721 // API.
1722 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1723 return (jobjectArray)NULL;
1724 } else {
1725 // Otherwise, we return something up to reflection, even if it is
1726 // a zero-length array. Why? Because in some cases this can
1727 // trigger a MalformedParametersException.
1728
1729 // make sure all the symbols are properly formatted
1730 for (int i = 0; i < num_params; i++) {
1731 MethodParametersElement* params = mh->method_parameters_start();
1732 int index = params[i].name_cp_index;
1733 bounds_check(mh->constants(), index, CHECK_NULL);
1734
1735 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1736 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1737 "Wrong type at constant pool index");
1738 }
1739
1740 }
1741
1742 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1743 objArrayHandle result (THREAD, result_oop);
1744
1745 for (int i = 0; i < num_params; i++) {
1746 MethodParametersElement* params = mh->method_parameters_start();
1747 // For a 0 index, give a NULL symbol
1748 Symbol* sym = 0 != params[i].name_cp_index ?
1749 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1750 int flags = params[i].flags;
1751 oop param = Reflection::new_parameter(reflected_method, i, sym,
1752 flags, CHECK_NULL);
1753 result->obj_at_put(i, param);
1754 }
1755 return (jobjectArray)JNIHandles::make_local(env, result());
1756 }
1757 }
1758 JVM_END
1759
1760 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1761
1762 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1763 {
1764 JVMWrapper("JVM_GetClassDeclaredFields");
1765 JvmtiVMObjectAllocEventCollector oam;
1766
1767 // Exclude primitive types and array types
1768 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1769 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1770 // Return empty array
1771 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1772 return (jobjectArray) JNIHandles::make_local(env, res);
1773 }
1774
1775 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1776 constantPoolHandle cp(THREAD, k->constants());
1777
1778 // Ensure class is linked
1779 k->link_class(CHECK_NULL);
1780
1781 // Allocate result
1782 int num_fields;
1783
1784 if (publicOnly) {
1785 num_fields = 0;
1786 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
1787 if (fs.access_flags().is_public()) ++num_fields;
1788 }
1789 } else {
1790 num_fields = k->java_fields_count();
1791 }
1792
1793 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1794 objArrayHandle result (THREAD, r);
1795
1796 int out_idx = 0;
1797 fieldDescriptor fd;
1798 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1799 if (!publicOnly || fs.access_flags().is_public()) {
1800 fd.reinitialize(k(), fs.index());
1801 oop field = Reflection::new_field(&fd, CHECK_NULL);
1802 result->obj_at_put(out_idx, field);
1803 ++out_idx;
1804 }
1805 }
1806 assert(out_idx == num_fields, "just checking");
1807 return (jobjectArray) JNIHandles::make_local(env, result());
1808 }
1809 JVM_END
1810
1811 static bool select_method(methodHandle method, bool want_constructor) {
1812 if (want_constructor) {
1813 return (method->is_initializer() && !method->is_static());
1814 } else {
1815 return (!method->is_initializer() && !method->is_overpass());
1816 }
1817 }
1818
1819 static jobjectArray get_class_declared_methods_helper(
1820 JNIEnv *env,
1821 jclass ofClass, jboolean publicOnly,
1822 bool want_constructor,
1823 Klass* klass, TRAPS) {
1824
1825 JvmtiVMObjectAllocEventCollector oam;
1826
1827 // Exclude primitive types and array types
1828 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1829 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1830 // Return empty array
1831 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1832 return (jobjectArray) JNIHandles::make_local(env, res);
1833 }
1834
1835 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1836
1837 // Ensure class is linked
1838 k->link_class(CHECK_NULL);
1839
1840 Array<Method*>* methods = k->methods();
1841 int methods_length = methods->length();
1842
1843 // Save original method_idnum in case of redefinition, which can change
1844 // the idnum of obsolete methods. The new method will have the same idnum
1845 // but if we refresh the methods array, the counts will be wrong.
1846 ResourceMark rm(THREAD);
1847 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1848 int num_methods = 0;
1849
1850 for (int i = 0; i < methods_length; i++) {
1851 methodHandle method(THREAD, methods->at(i));
1852 if (select_method(method, want_constructor)) {
1853 if (!publicOnly || method->is_public()) {
1854 idnums->push(method->method_idnum());
1855 ++num_methods;
1856 }
1857 }
1858 }
1859
1860 // Allocate result
1861 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1862 objArrayHandle result (THREAD, r);
1863
1864 // Now just put the methods that we selected above, but go by their idnum
1865 // in case of redefinition. The methods can be redefined at any safepoint,
1866 // so above when allocating the oop array and below when creating reflect
1867 // objects.
1868 for (int i = 0; i < num_methods; i++) {
1869 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1870 if (method.is_null()) {
1871 // Method may have been deleted and seems this API can handle null
1872 // Otherwise should probably put a method that throws NSME
1873 result->obj_at_put(i, NULL);
1874 } else {
1875 oop m;
1876 if (want_constructor) {
1877 m = Reflection::new_constructor(method, CHECK_NULL);
1878 } else {
1879 m = Reflection::new_method(method, false, CHECK_NULL);
1880 }
1881 result->obj_at_put(i, m);
1882 }
1883 }
1884
1885 return (jobjectArray) JNIHandles::make_local(env, result());
1886 }
1887
1888 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1889 {
1890 JVMWrapper("JVM_GetClassDeclaredMethods");
1891 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1892 /*want_constructor*/ false,
1893 SystemDictionary::reflect_Method_klass(), THREAD);
1894 }
1895 JVM_END
1896
1897 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1898 {
1899 JVMWrapper("JVM_GetClassDeclaredConstructors");
1900 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1901 /*want_constructor*/ true,
1902 SystemDictionary::reflect_Constructor_klass(), THREAD);
1903 }
1904 JVM_END
1905
1906 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1907 {
1908 JVMWrapper("JVM_GetClassAccessFlags");
1909 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1910 // Primitive type
1911 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1912 }
1913
1914 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1915 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1916 }
1917 JVM_END
1918
1919
1920 // Constant pool access //////////////////////////////////////////////////////////
1921
1922 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1923 {
1924 JVMWrapper("JVM_GetClassConstantPool");
1925 JvmtiVMObjectAllocEventCollector oam;
1926
1927 // Return null for primitives and arrays
1928 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1929 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1930 if (k->is_instance_klass()) {
1931 instanceKlassHandle k_h(THREAD, k);
1932 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1933 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1934 return JNIHandles::make_local(jcp());
1935 }
1936 }
1937 return NULL;
1938 }
1939 JVM_END
1940
1941
1942 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1943 {
1944 JVMWrapper("JVM_ConstantPoolGetSize");
1945 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1946 return cp->length();
1947 }
1948 JVM_END
1949
1950
1951 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1952 {
1953 JVMWrapper("JVM_ConstantPoolGetClassAt");
1954 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1955 bounds_check(cp, index, CHECK_NULL);
1956 constantTag tag = cp->tag_at(index);
1957 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1958 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1959 }
1960 Klass* k = cp->klass_at(index, CHECK_NULL);
1961 return (jclass) JNIHandles::make_local(k->java_mirror());
1962 }
1963 JVM_END
1964
1965 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1966 {
1967 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1968 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1969 bounds_check(cp, index, CHECK_NULL);
1970 constantTag tag = cp->tag_at(index);
1971 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1972 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1973 }
1974 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1975 if (k == NULL) return NULL;
1976 return (jclass) JNIHandles::make_local(k->java_mirror());
1977 }
1978 JVM_END
1979
1980 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1981 constantTag tag = cp->tag_at(index);
1982 if (!tag.is_method() && !tag.is_interface_method()) {
1983 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1984 }
1985 int klass_ref = cp->uncached_klass_ref_index_at(index);
1986 Klass* k_o;
1987 if (force_resolution) {
1988 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1989 } else {
1990 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1991 if (k_o == NULL) return NULL;
1992 }
1993 instanceKlassHandle k(THREAD, k_o);
1994 Symbol* name = cp->uncached_name_ref_at(index);
1995 Symbol* sig = cp->uncached_signature_ref_at(index);
1996 methodHandle m (THREAD, k->find_method(name, sig));
1997 if (m.is_null()) {
1998 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1999 }
2000 oop method;
2001 if (!m->is_initializer() || m->is_static()) {
2002 method = Reflection::new_method(m, true, CHECK_NULL);
2003 } else {
2004 method = Reflection::new_constructor(m, CHECK_NULL);
2005 }
2006 return JNIHandles::make_local(method);
2007 }
2008
2009 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2010 {
2011 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2012 JvmtiVMObjectAllocEventCollector oam;
2013 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2014 bounds_check(cp, index, CHECK_NULL);
2015 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2016 return res;
2017 }
2018 JVM_END
2019
2020 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2021 {
2022 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2023 JvmtiVMObjectAllocEventCollector oam;
2024 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2025 bounds_check(cp, index, CHECK_NULL);
2026 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2027 return res;
2028 }
2029 JVM_END
2030
2031 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2032 constantTag tag = cp->tag_at(index);
2033 if (!tag.is_field()) {
2034 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2035 }
2036 int klass_ref = cp->uncached_klass_ref_index_at(index);
2037 Klass* k_o;
2038 if (force_resolution) {
2039 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2040 } else {
2041 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2042 if (k_o == NULL) return NULL;
2043 }
2044 instanceKlassHandle k(THREAD, k_o);
2045 Symbol* name = cp->uncached_name_ref_at(index);
2046 Symbol* sig = cp->uncached_signature_ref_at(index);
2047 fieldDescriptor fd;
2048 Klass* target_klass = k->find_field(name, sig, &fd);
2049 if (target_klass == NULL) {
2050 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2051 }
2052 oop field = Reflection::new_field(&fd, CHECK_NULL);
2053 return JNIHandles::make_local(field);
2054 }
2055
2056 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2057 {
2058 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2059 JvmtiVMObjectAllocEventCollector oam;
2060 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2061 bounds_check(cp, index, CHECK_NULL);
2062 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2063 return res;
2064 }
2065 JVM_END
2066
2067 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2068 {
2069 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2070 JvmtiVMObjectAllocEventCollector oam;
2071 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2072 bounds_check(cp, index, CHECK_NULL);
2073 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2074 return res;
2075 }
2076 JVM_END
2077
2078 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2079 {
2080 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2081 JvmtiVMObjectAllocEventCollector oam;
2082 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2083 bounds_check(cp, index, CHECK_NULL);
2084 constantTag tag = cp->tag_at(index);
2085 if (!tag.is_field_or_method()) {
2086 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2087 }
2088 int klass_ref = cp->uncached_klass_ref_index_at(index);
2089 Symbol* klass_name = cp->klass_name_at(klass_ref);
2090 Symbol* member_name = cp->uncached_name_ref_at(index);
2091 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2092 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2093 objArrayHandle dest(THREAD, dest_o);
2094 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2095 dest->obj_at_put(0, str());
2096 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2097 dest->obj_at_put(1, str());
2098 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2099 dest->obj_at_put(2, str());
2100 return (jobjectArray) JNIHandles::make_local(dest());
2101 }
2102 JVM_END
2103
2104 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2105 {
2106 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2107 JvmtiVMObjectAllocEventCollector oam;
2108 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2109 bounds_check(cp, index, CHECK_0);
2110 constantTag tag = cp->tag_at(index);
2111 if (!tag.is_field_or_method()) {
2112 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2113 }
2114 return (jint) cp->uncached_klass_ref_index_at(index);
2115 }
2116 JVM_END
2117
2118 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2119 {
2120 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2121 JvmtiVMObjectAllocEventCollector oam;
2122 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2123 bounds_check(cp, index, CHECK_0);
2124 constantTag tag = cp->tag_at(index);
2125 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2126 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2127 }
2128 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2129 }
2130 JVM_END
2131
2132 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2133 {
2134 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2135 JvmtiVMObjectAllocEventCollector oam;
2136 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2137 bounds_check(cp, index, CHECK_NULL);
2138 constantTag tag = cp->tag_at(index);
2139 if (!tag.is_name_and_type()) {
2140 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2141 }
2142 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2143 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2144 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2145 objArrayHandle dest(THREAD, dest_o);
2146 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2147 dest->obj_at_put(0, str());
2148 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2149 dest->obj_at_put(1, str());
2150 return (jobjectArray) JNIHandles::make_local(dest());
2151 }
2152 JVM_END
2153
2154 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2155 {
2156 JVMWrapper("JVM_ConstantPoolGetIntAt");
2157 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2158 bounds_check(cp, index, CHECK_0);
2159 constantTag tag = cp->tag_at(index);
2160 if (!tag.is_int()) {
2161 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2162 }
2163 return cp->int_at(index);
2164 }
2165 JVM_END
2166
2167 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2168 {
2169 JVMWrapper("JVM_ConstantPoolGetLongAt");
2170 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2171 bounds_check(cp, index, CHECK_(0L));
2172 constantTag tag = cp->tag_at(index);
2173 if (!tag.is_long()) {
2174 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2175 }
2176 return cp->long_at(index);
2177 }
2178 JVM_END
2179
2180 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2181 {
2182 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2183 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2184 bounds_check(cp, index, CHECK_(0.0f));
2185 constantTag tag = cp->tag_at(index);
2186 if (!tag.is_float()) {
2187 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2188 }
2189 return cp->float_at(index);
2190 }
2191 JVM_END
2192
2193 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2194 {
2195 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2196 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2197 bounds_check(cp, index, CHECK_(0.0));
2198 constantTag tag = cp->tag_at(index);
2199 if (!tag.is_double()) {
2200 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2201 }
2202 return cp->double_at(index);
2203 }
2204 JVM_END
2205
2206 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2207 {
2208 JVMWrapper("JVM_ConstantPoolGetStringAt");
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_string()) {
2213 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2214 }
2215 oop str = cp->string_at(index, CHECK_NULL);
2216 return (jstring) JNIHandles::make_local(str);
2217 }
2218 JVM_END
2219
2220 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2221 {
2222 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2223 JvmtiVMObjectAllocEventCollector oam;
2224 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2225 bounds_check(cp, index, CHECK_NULL);
2226 constantTag tag = cp->tag_at(index);
2227 if (!tag.is_symbol()) {
2228 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2229 }
2230 Symbol* sym = cp->symbol_at(index);
2231 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2232 return (jstring) JNIHandles::make_local(str());
2233 }
2234 JVM_END
2235
2236 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2237 {
2238 JVMWrapper("JVM_ConstantPoolGetTagAt");
2239 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2240 bounds_check(cp, index, CHECK_0);
2241 constantTag tag = cp->tag_at(index);
2242 jbyte result = tag.value();
2243 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2244 // they are changed to the corresponding tags from the JVM spec, so that java code in
2245 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2246 if (tag.is_klass_or_reference()) {
2247 result = JVM_CONSTANT_Class;
2248 } else if (tag.is_string_index()) {
2249 result = JVM_CONSTANT_String;
2250 } else if (tag.is_method_type_in_error()) {
2251 result = JVM_CONSTANT_MethodType;
2252 } else if (tag.is_method_handle_in_error()) {
2253 result = JVM_CONSTANT_MethodHandle;
2254 }
2255 return result;
2256 }
2257 JVM_END
2258
2259 // Assertion support. //////////////////////////////////////////////////////////
2260
2261 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2262 JVMWrapper("JVM_DesiredAssertionStatus");
2263 assert(cls != NULL, "bad class");
2264
2265 oop r = JNIHandles::resolve(cls);
2266 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2267 if (java_lang_Class::is_primitive(r)) return false;
2268
2269 Klass* k = java_lang_Class::as_Klass(r);
2270 assert(k->is_instance_klass(), "must be an instance klass");
2271 if (!k->is_instance_klass()) return false;
2272
2273 ResourceMark rm(THREAD);
2274 const char* name = k->name()->as_C_string();
2275 bool system_class = k->class_loader() == NULL;
2276 return JavaAssertions::enabled(name, system_class);
2277
2278 JVM_END
2279
2280
2281 // Return a new AssertionStatusDirectives object with the fields filled in with
2282 // command-line assertion arguments (i.e., -ea, -da).
2283 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2284 JVMWrapper("JVM_AssertionStatusDirectives");
2285 JvmtiVMObjectAllocEventCollector oam;
2286 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2287 return JNIHandles::make_local(env, asd);
2288 JVM_END
2289
2290 // Verification ////////////////////////////////////////////////////////////////////////////////
2291
2292 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2293
2294 // RedefineClasses support: bug 6214132 caused verification to fail.
2295 // All functions from this section should call the jvmtiThreadSate function:
2296 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2297 // The function returns a Klass* of the _scratch_class if the verifier
2298 // was invoked in the middle of the class redefinition.
2299 // Otherwise it returns its argument value which is the _the_class Klass*.
2300 // Please, refer to the description in the jvmtiThreadSate.hpp.
2301
2302 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2303 JVMWrapper("JVM_GetClassNameUTF");
2304 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2305 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2306 return k->name()->as_utf8();
2307 JVM_END
2308
2309
2310 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2311 JVMWrapper("JVM_GetClassCPTypes");
2312 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2313 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2314 // types will have length zero if this is not an InstanceKlass
2315 // (length is determined by call to JVM_GetClassCPEntriesCount)
2316 if (k->is_instance_klass()) {
2317 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2318 for (int index = cp->length() - 1; index >= 0; index--) {
2319 constantTag tag = cp->tag_at(index);
2320 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2321 }
2322 }
2323 JVM_END
2324
2325
2326 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2327 JVMWrapper("JVM_GetClassCPEntriesCount");
2328 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2329 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2330 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2331 JVM_END
2332
2333
2334 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2335 JVMWrapper("JVM_GetClassFieldsCount");
2336 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2337 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2338 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2339 JVM_END
2340
2341
2342 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2343 JVMWrapper("JVM_GetClassMethodsCount");
2344 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2345 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2346 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2347 JVM_END
2348
2349
2350 // The following methods, used for the verifier, are never called with
2351 // array klasses, so a direct cast to InstanceKlass is safe.
2352 // Typically, these methods are called in a loop with bounds determined
2353 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2354 // zero for arrays.
2355 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2356 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
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 int length = method->checked_exceptions_length();
2361 if (length > 0) {
2362 CheckedExceptionElement* table= method->checked_exceptions_start();
2363 for (int i = 0; i < length; i++) {
2364 exceptions[i] = table[i].class_cp_index;
2365 }
2366 }
2367 JVM_END
2368
2369
2370 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2371 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2372 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2373 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2374 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2375 return method->checked_exceptions_length();
2376 JVM_END
2377
2378
2379 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2380 JVMWrapper("JVM_GetMethodIxByteCode");
2381 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2382 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2383 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2384 memcpy(code, method->code_base(), method->code_size());
2385 JVM_END
2386
2387
2388 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2389 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2390 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2391 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2392 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2393 return method->code_size();
2394 JVM_END
2395
2396
2397 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2398 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2399 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2400 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2401 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2402 ExceptionTable extable(method);
2403 entry->start_pc = extable.start_pc(entry_index);
2404 entry->end_pc = extable.end_pc(entry_index);
2405 entry->handler_pc = extable.handler_pc(entry_index);
2406 entry->catchType = extable.catch_type_index(entry_index);
2407 JVM_END
2408
2409
2410 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2411 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2412 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2413 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2414 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2415 return method->exception_table_length();
2416 JVM_END
2417
2418
2419 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2420 JVMWrapper("JVM_GetMethodIxModifiers");
2421 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2422 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2423 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2424 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2425 JVM_END
2426
2427
2428 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2429 JVMWrapper("JVM_GetFieldIxModifiers");
2430 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2431 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2432 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2433 JVM_END
2434
2435
2436 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2437 JVMWrapper("JVM_GetMethodIxLocalsCount");
2438 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2439 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2440 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2441 return method->max_locals();
2442 JVM_END
2443
2444
2445 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2446 JVMWrapper("JVM_GetMethodIxArgsSize");
2447 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2448 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2449 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2450 return method->size_of_parameters();
2451 JVM_END
2452
2453
2454 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2455 JVMWrapper("JVM_GetMethodIxMaxStack");
2456 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2457 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2458 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2459 return method->verifier_max_stack();
2460 JVM_END
2461
2462
2463 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2464 JVMWrapper("JVM_IsConstructorIx");
2465 ResourceMark rm(THREAD);
2466 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2467 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2468 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2469 return method->name() == vmSymbols::object_initializer_name();
2470 JVM_END
2471
2472
2473 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2474 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2475 ResourceMark rm(THREAD);
2476 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2477 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2478 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2479 return method->is_overpass();
2480 JVM_END
2481
2482 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2483 JVMWrapper("JVM_GetMethodIxIxUTF");
2484 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2485 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2486 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2487 return method->name()->as_utf8();
2488 JVM_END
2489
2490
2491 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2492 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2493 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2494 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2495 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2496 return method->signature()->as_utf8();
2497 JVM_END
2498
2499 /**
2500 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2501 * read entries in the constant pool. Since the old verifier always
2502 * works on a copy of the code, it will not see any rewriting that
2503 * may possibly occur in the middle of verification. So it is important
2504 * that nothing it calls tries to use the cpCache instead of the raw
2505 * constant pool, so we must use cp->uncached_x methods when appropriate.
2506 */
2507 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2508 JVMWrapper("JVM_GetCPFieldNameUTF");
2509 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2510 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2511 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2512 switch (cp->tag_at(cp_index).value()) {
2513 case JVM_CONSTANT_Fieldref:
2514 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2515 default:
2516 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2517 }
2518 ShouldNotReachHere();
2519 return NULL;
2520 JVM_END
2521
2522
2523 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2524 JVMWrapper("JVM_GetCPMethodNameUTF");
2525 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2526 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2527 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2528 switch (cp->tag_at(cp_index).value()) {
2529 case JVM_CONSTANT_InterfaceMethodref:
2530 case JVM_CONSTANT_Methodref:
2531 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2532 default:
2533 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2534 }
2535 ShouldNotReachHere();
2536 return NULL;
2537 JVM_END
2538
2539
2540 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2541 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2542 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2543 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2544 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2545 switch (cp->tag_at(cp_index).value()) {
2546 case JVM_CONSTANT_InterfaceMethodref:
2547 case JVM_CONSTANT_Methodref:
2548 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2549 default:
2550 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2551 }
2552 ShouldNotReachHere();
2553 return NULL;
2554 JVM_END
2555
2556
2557 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2558 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2559 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2560 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2561 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2562 switch (cp->tag_at(cp_index).value()) {
2563 case JVM_CONSTANT_Fieldref:
2564 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2565 default:
2566 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2567 }
2568 ShouldNotReachHere();
2569 return NULL;
2570 JVM_END
2571
2572
2573 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2574 JVMWrapper("JVM_GetCPClassNameUTF");
2575 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2576 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2577 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2578 Symbol* classname = cp->klass_name_at(cp_index);
2579 return classname->as_utf8();
2580 JVM_END
2581
2582
2583 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2584 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2585 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2586 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2587 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2588 switch (cp->tag_at(cp_index).value()) {
2589 case JVM_CONSTANT_Fieldref: {
2590 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2591 Symbol* classname = cp->klass_name_at(class_index);
2592 return classname->as_utf8();
2593 }
2594 default:
2595 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2596 }
2597 ShouldNotReachHere();
2598 return NULL;
2599 JVM_END
2600
2601
2602 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2603 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2604 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2605 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2606 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2607 switch (cp->tag_at(cp_index).value()) {
2608 case JVM_CONSTANT_Methodref:
2609 case JVM_CONSTANT_InterfaceMethodref: {
2610 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2611 Symbol* classname = cp->klass_name_at(class_index);
2612 return classname->as_utf8();
2613 }
2614 default:
2615 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2616 }
2617 ShouldNotReachHere();
2618 return NULL;
2619 JVM_END
2620
2621
2622 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2623 JVMWrapper("JVM_GetCPFieldModifiers");
2624 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2625 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2626 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2627 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2628 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2629 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2630 switch (cp->tag_at(cp_index).value()) {
2631 case JVM_CONSTANT_Fieldref: {
2632 Symbol* name = cp->uncached_name_ref_at(cp_index);
2633 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2634 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2635 if (fs.name() == name && fs.signature() == signature) {
2636 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2637 }
2638 }
2639 return -1;
2640 }
2641 default:
2642 fatal("JVM_GetCPFieldModifiers: illegal constant");
2643 }
2644 ShouldNotReachHere();
2645 return 0;
2646 JVM_END
2647
2648
2649 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2650 JVMWrapper("JVM_GetCPMethodModifiers");
2651 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2652 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2653 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2654 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2655 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2656 switch (cp->tag_at(cp_index).value()) {
2657 case JVM_CONSTANT_Methodref:
2658 case JVM_CONSTANT_InterfaceMethodref: {
2659 Symbol* name = cp->uncached_name_ref_at(cp_index);
2660 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2661 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2662 int methods_count = methods->length();
2663 for (int i = 0; i < methods_count; i++) {
2664 Method* method = methods->at(i);
2665 if (method->name() == name && method->signature() == signature) {
2666 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2667 }
2668 }
2669 return -1;
2670 }
2671 default:
2672 fatal("JVM_GetCPMethodModifiers: illegal constant");
2673 }
2674 ShouldNotReachHere();
2675 return 0;
2676 JVM_END
2677
2678
2679 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2680
2681 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2682 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2683 JVM_END
2684
2685
2686 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2687 JVMWrapper("JVM_IsSameClassPackage");
2688 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2689 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2690 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2691 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2692 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2693 JVM_END
2694
2695 // Printing support //////////////////////////////////////////////////
2696 extern "C" {
2697
2698 ATTRIBUTE_PRINTF(3, 0)
2699 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2700 // see bug 4399518, 4417214
2701 if ((intptr_t)count <= 0) return -1;
2702
2703 int result = vsnprintf(str, count, fmt, args);
2704 // Note: on truncation vsnprintf(3) on Unix returns numbers of
2705 // characters which would have been written had the buffer been large
2706 // enough; on Windows, it returns -1. We handle both cases here and
2707 // always return -1, and perform null termination.
2708 if ((result > 0 && (size_t)result >= count) || result == -1) {
2709 str[count - 1] = '\0';
2710 result = -1;
2711 }
2712
2713 return result;
2714 }
2715
2716 ATTRIBUTE_PRINTF(3, 0)
2717 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2718 va_list args;
2719 int len;
2720 va_start(args, fmt);
2721 len = jio_vsnprintf(str, count, fmt, args);
2722 va_end(args);
2723 return len;
2724 }
2725
2726 ATTRIBUTE_PRINTF(2,3)
2727 int jio_fprintf(FILE* f, const char *fmt, ...) {
2728 int len;
2729 va_list args;
2730 va_start(args, fmt);
2731 len = jio_vfprintf(f, fmt, args);
2732 va_end(args);
2733 return len;
2734 }
2735
2736 ATTRIBUTE_PRINTF(2, 0)
2737 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2738 if (Arguments::vfprintf_hook() != NULL) {
2739 return Arguments::vfprintf_hook()(f, fmt, args);
2740 } else {
2741 return vfprintf(f, fmt, args);
2742 }
2743 }
2744
2745 ATTRIBUTE_PRINTF(1, 2)
2746 JNIEXPORT int jio_printf(const char *fmt, ...) {
2747 int len;
2748 va_list args;
2749 va_start(args, fmt);
2750 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2751 va_end(args);
2752 return len;
2753 }
2754
2755
2756 // HotSpot specific jio method
2757 void jio_print(const char* s) {
2758 // Try to make this function as atomic as possible.
2759 if (Arguments::vfprintf_hook() != NULL) {
2760 jio_fprintf(defaultStream::output_stream(), "%s", s);
2761 } else {
2762 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2763 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2764 }
2765 }
2766
2767 } // Extern C
2768
2769 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2770
2771 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2772 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2773 // OSThread objects. The exception to this rule is when the target object is the thread
2774 // doing the operation, in which case we know that the thread won't exit until the
2775 // operation is done (all exits being voluntary). There are a few cases where it is
2776 // rather silly to do operations on yourself, like resuming yourself or asking whether
2777 // you are alive. While these can still happen, they are not subject to deadlocks if
2778 // the lock is held while the operation occurs (this is not the case for suspend, for
2779 // instance), and are very unlikely. Because IsAlive needs to be fast and its
2780 // implementation is local to this file, we always lock Threads_lock for that one.
2781
2782 static void thread_entry(JavaThread* thread, TRAPS) {
2783 HandleMark hm(THREAD);
2784 Handle obj(THREAD, thread->threadObj());
2785 JavaValue result(T_VOID);
2786 JavaCalls::call_virtual(&result,
2787 obj,
2788 KlassHandle(THREAD, SystemDictionary::Thread_klass()),
2789 vmSymbols::run_method_name(),
2790 vmSymbols::void_method_signature(),
2791 THREAD);
2792 }
2793
2794
2795 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2796 JVMWrapper("JVM_StartThread");
2797 JavaThread *native_thread = NULL;
2798
2799 // We cannot hold the Threads_lock when we throw an exception,
2800 // due to rank ordering issues. Example: we might need to grab the
2801 // Heap_lock while we construct the exception.
2802 bool throw_illegal_thread_state = false;
2803
2804 // We must release the Threads_lock before we can post a jvmti event
2805 // in Thread::start.
2806 {
2807 // Ensure that the C++ Thread and OSThread structures aren't freed before
2808 // we operate.
2809 MutexLocker mu(Threads_lock);
2810
2811 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2812 // re-starting an already started thread, so we should usually find
2813 // that the JavaThread is null. However for a JNI attached thread
2814 // there is a small window between the Thread object being created
2815 // (with its JavaThread set) and the update to its threadStatus, so we
2816 // have to check for this
2817 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2818 throw_illegal_thread_state = true;
2819 } else {
2820 // We could also check the stillborn flag to see if this thread was already stopped, but
2821 // for historical reasons we let the thread detect that itself when it starts running
2822
2823 jlong size =
2824 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2825 // Allocate the C++ Thread structure and create the native thread. The
2826 // stack size retrieved from java is signed, but the constructor takes
2827 // size_t (an unsigned type), so avoid passing negative values which would
2828 // result in really large stacks.
2829 size_t sz = size > 0 ? (size_t) size : 0;
2830 native_thread = new JavaThread(&thread_entry, sz);
2831
2832 // At this point it may be possible that no osthread was created for the
2833 // JavaThread due to lack of memory. Check for this situation and throw
2834 // an exception if necessary. Eventually we may want to change this so
2835 // that we only grab the lock if the thread was created successfully -
2836 // then we can also do this check and throw the exception in the
2837 // JavaThread constructor.
2838 if (native_thread->osthread() != NULL) {
2839 // Note: the current thread is not being used within "prepare".
2840 native_thread->prepare(jthread);
2841 }
2842 }
2843 }
2844
2845 if (throw_illegal_thread_state) {
2846 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2847 }
2848
2849 assert(native_thread != NULL, "Starting null thread?");
2850
2851 if (native_thread->osthread() == NULL) {
2852 // No one should hold a reference to the 'native_thread'.
2853 delete native_thread;
2854 if (JvmtiExport::should_post_resource_exhausted()) {
2855 JvmtiExport::post_resource_exhausted(
2856 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2857 os::native_thread_creation_failed_msg());
2858 }
2859 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2860 os::native_thread_creation_failed_msg());
2861 }
2862
2863 Thread::start(native_thread);
2864
2865 JVM_END
2866
2867 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2868 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2869 // but is thought to be reliable and simple. In the case, where the receiver is the
2870 // same thread as the sender, no safepoint is needed.
2871 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2872 JVMWrapper("JVM_StopThread");
2873
2874 oop java_throwable = JNIHandles::resolve(throwable);
2875 if (java_throwable == NULL) {
2876 THROW(vmSymbols::java_lang_NullPointerException());
2877 }
2878 oop java_thread = JNIHandles::resolve_non_null(jthread);
2879 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2880 Events::log_exception(JavaThread::current(),
2881 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2882 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2883 // First check if thread is alive
2884 if (receiver != NULL) {
2885 // Check if exception is getting thrown at self (use oop equality, since the
2886 // target object might exit)
2887 if (java_thread == thread->threadObj()) {
2888 THROW_OOP(java_throwable);
2889 } else {
2890 // Enques a VM_Operation to stop all threads and then deliver the exception...
2891 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2892 }
2893 }
2894 else {
2895 // Either:
2896 // - target thread has not been started before being stopped, or
2897 // - target thread already terminated
2898 // We could read the threadStatus to determine which case it is
2899 // but that is overkill as it doesn't matter. We must set the
2900 // stillborn flag for the first case, and if the thread has already
2901 // exited setting this flag has no affect
2902 java_lang_Thread::set_stillborn(java_thread);
2903 }
2904 JVM_END
2905
2906
2907 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2908 JVMWrapper("JVM_IsThreadAlive");
2909
2910 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2911 return java_lang_Thread::is_alive(thread_oop);
2912 JVM_END
2913
2914
2915 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2916 JVMWrapper("JVM_SuspendThread");
2917 oop java_thread = JNIHandles::resolve_non_null(jthread);
2918 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2919
2920 if (receiver != NULL) {
2921 // thread has run and has not exited (still on threads list)
2922
2923 {
2924 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2925 if (receiver->is_external_suspend()) {
2926 // Don't allow nested external suspend requests. We can't return
2927 // an error from this interface so just ignore the problem.
2928 return;
2929 }
2930 if (receiver->is_exiting()) { // thread is in the process of exiting
2931 return;
2932 }
2933 receiver->set_external_suspend();
2934 }
2935
2936 // java_suspend() will catch threads in the process of exiting
2937 // and will ignore them.
2938 receiver->java_suspend();
2939
2940 // It would be nice to have the following assertion in all the
2941 // time, but it is possible for a racing resume request to have
2942 // resumed this thread right after we suspended it. Temporarily
2943 // enable this assertion if you are chasing a different kind of
2944 // bug.
2945 //
2946 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2947 // receiver->is_being_ext_suspended(), "thread is not suspended");
2948 }
2949 JVM_END
2950
2951
2952 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2953 JVMWrapper("JVM_ResumeThread");
2954 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2955 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2956 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2957 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2958 // looks at it.
2959 MutexLocker ml(Threads_lock);
2960 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2961 if (thr != NULL) {
2962 // the thread has run and is not in the process of exiting
2963 thr->java_resume();
2964 }
2965 JVM_END
2966
2967
2968 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2969 JVMWrapper("JVM_SetThreadPriority");
2970 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2971 MutexLocker ml(Threads_lock);
2972 oop java_thread = JNIHandles::resolve_non_null(jthread);
2973 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2974 JavaThread* thr = java_lang_Thread::thread(java_thread);
2975 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
2976 Thread::set_priority(thr, (ThreadPriority)prio);
2977 }
2978 JVM_END
2979
2980
2981 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2982 JVMWrapper("JVM_Yield");
2983 if (os::dont_yield()) return;
2984 HOTSPOT_THREAD_YIELD();
2985
2986 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
2987 // Critical for similar threading behaviour
2988 if (ConvertYieldToSleep) {
2989 os::sleep(thread, MinSleepInterval, false);
2990 } else {
2991 os::naked_yield();
2992 }
2993 JVM_END
2994
2995
2996 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2997 JVMWrapper("JVM_Sleep");
2998
2999 if (millis < 0) {
3000 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3001 }
3002
3003 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3004 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3005 }
3006
3007 // Save current thread state and restore it at the end of this block.
3008 // And set new thread state to SLEEPING.
3009 JavaThreadSleepState jtss(thread);
3010
3011 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3012
3013 EventThreadSleep event;
3014
3015 if (millis == 0) {
3016 // When ConvertSleepToYield is on, this matches the classic VM implementation of
3017 // JVM_Sleep. Critical for similar threading behaviour (Win32)
3018 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
3019 // for SOLARIS
3020 if (ConvertSleepToYield) {
3021 os::naked_yield();
3022 } else {
3023 ThreadState old_state = thread->osthread()->get_state();
3024 thread->osthread()->set_state(SLEEPING);
3025 os::sleep(thread, MinSleepInterval, false);
3026 thread->osthread()->set_state(old_state);
3027 }
3028 } else {
3029 ThreadState old_state = thread->osthread()->get_state();
3030 thread->osthread()->set_state(SLEEPING);
3031 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3032 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3033 // us while we were sleeping. We do not overwrite those.
3034 if (!HAS_PENDING_EXCEPTION) {
3035 if (event.should_commit()) {
3036 event.set_time(millis);
3037 event.commit();
3038 }
3039 HOTSPOT_THREAD_SLEEP_END(1);
3040
3041 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3042 // to properly restore the thread state. That's likely wrong.
3043 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3044 }
3045 }
3046 thread->osthread()->set_state(old_state);
3047 }
3048 if (event.should_commit()) {
3049 event.set_time(millis);
3050 event.commit();
3051 }
3052 HOTSPOT_THREAD_SLEEP_END(0);
3053 JVM_END
3054
3055 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3056 JVMWrapper("JVM_CurrentThread");
3057 oop jthread = thread->threadObj();
3058 assert (thread != NULL, "no current thread!");
3059 return JNIHandles::make_local(env, jthread);
3060 JVM_END
3061
3062
3063 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3064 JVMWrapper("JVM_CountStackFrames");
3065
3066 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3067 oop java_thread = JNIHandles::resolve_non_null(jthread);
3068 bool throw_illegal_thread_state = false;
3069 int count = 0;
3070
3071 {
3072 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3073 // We need to re-resolve the java_thread, since a GC might have happened during the
3074 // acquire of the lock
3075 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3076
3077 if (thr == NULL) {
3078 // do nothing
3079 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
3080 // Check whether this java thread has been suspended already. If not, throws
3081 // IllegalThreadStateException. We defer to throw that exception until
3082 // Threads_lock is released since loading exception class has to leave VM.
3083 // The correct way to test a thread is actually suspended is
3084 // wait_for_ext_suspend_completion(), but we can't call that while holding
3085 // the Threads_lock. The above tests are sufficient for our purposes
3086 // provided the walkability of the stack is stable - which it isn't
3087 // 100% but close enough for most practical purposes.
3088 throw_illegal_thread_state = true;
3089 } else {
3090 // Count all java activation, i.e., number of vframes
3091 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
3092 // Native frames are not counted
3093 if (!vfst.method()->is_native()) count++;
3094 }
3095 }
3096 }
3097
3098 if (throw_illegal_thread_state) {
3099 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3100 "this thread is not suspended");
3101 }
3102 return count;
3103 JVM_END
3104
3105 // Consider: A better way to implement JVM_Interrupt() is to acquire
3106 // Threads_lock to resolve the jthread into a Thread pointer, fetch
3107 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
3108 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
3109 // outside the critical section. Threads_lock is hot so we want to minimize
3110 // the hold-time. A cleaner interface would be to decompose interrupt into
3111 // two steps. The 1st phase, performed under Threads_lock, would return
3112 // a closure that'd be invoked after Threads_lock was dropped.
3113 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
3114 // admit spurious wakeups.
3115
3116 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3117 JVMWrapper("JVM_Interrupt");
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 Thread::interrupt(thr);
3127 }
3128 JVM_END
3129
3130
3131 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3132 JVMWrapper("JVM_IsInterrupted");
3133
3134 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3135 oop java_thread = JNIHandles::resolve_non_null(jthread);
3136 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3137 // We need to re-resolve the java_thread, since a GC might have happened during the
3138 // acquire of the lock
3139 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3140 if (thr == NULL) {
3141 return JNI_FALSE;
3142 } else {
3143 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3144 }
3145 JVM_END
3146
3147
3148 // Return true iff the current thread has locked the object passed in
3149
3150 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3151 JVMWrapper("JVM_HoldsLock");
3152 assert(THREAD->is_Java_thread(), "sanity check");
3153 if (obj == NULL) {
3154 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3155 }
3156 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3157 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3158 JVM_END
3159
3160
3161 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3162 JVMWrapper("JVM_DumpAllStacks");
3163 VM_PrintThreads op;
3164 VMThread::execute(&op);
3165 if (JvmtiExport::should_post_data_dump()) {
3166 JvmtiExport::post_data_dump();
3167 }
3168 JVM_END
3169
3170 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3171 JVMWrapper("JVM_SetNativeThreadName");
3172 ResourceMark rm(THREAD);
3173 oop java_thread = JNIHandles::resolve_non_null(jthread);
3174 JavaThread* thr = java_lang_Thread::thread(java_thread);
3175 // Thread naming only supported for the current thread, doesn't work for
3176 // target threads.
3177 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3178 // we don't set the name of an attached thread to avoid stepping
3179 // on other programs
3180 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3181 os::set_native_thread_name(thread_name);
3182 }
3183 JVM_END
3184
3185 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3186
3187 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3188 assert(jthread->is_Java_thread(), "must be a Java thread");
3189 if (jthread->privileged_stack_top() == NULL) return false;
3190 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3191 oop loader = jthread->privileged_stack_top()->class_loader();
3192 if (loader == NULL) return true;
3193 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3194 if (trusted) return true;
3195 }
3196 return false;
3197 }
3198
3199 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3200 JVMWrapper("JVM_CurrentLoadedClass");
3201 ResourceMark rm(THREAD);
3202
3203 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3204 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3205 bool trusted = is_trusted_frame(thread, &vfst);
3206 if (trusted) return NULL;
3207
3208 Method* m = vfst.method();
3209 if (!m->is_native()) {
3210 InstanceKlass* holder = m->method_holder();
3211 oop loader = holder->class_loader();
3212 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3213 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3214 }
3215 }
3216 }
3217 return NULL;
3218 JVM_END
3219
3220
3221 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3222 JVMWrapper("JVM_CurrentClassLoader");
3223 ResourceMark rm(THREAD);
3224
3225 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3226
3227 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3228 bool trusted = is_trusted_frame(thread, &vfst);
3229 if (trusted) return NULL;
3230
3231 Method* m = vfst.method();
3232 if (!m->is_native()) {
3233 InstanceKlass* holder = m->method_holder();
3234 assert(holder->is_klass(), "just checking");
3235 oop loader = holder->class_loader();
3236 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3237 return JNIHandles::make_local(env, loader);
3238 }
3239 }
3240 }
3241 return NULL;
3242 JVM_END
3243
3244
3245 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3246 JVMWrapper("JVM_GetClassContext");
3247 ResourceMark rm(THREAD);
3248 JvmtiVMObjectAllocEventCollector oam;
3249 vframeStream vfst(thread);
3250
3251 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3252 // This must only be called from SecurityManager.getClassContext
3253 Method* m = vfst.method();
3254 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3255 m->name() == vmSymbols::getClassContext_name() &&
3256 m->signature() == vmSymbols::void_class_array_signature())) {
3257 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3258 }
3259 }
3260
3261 // Collect method holders
3262 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3263 for (; !vfst.at_end(); vfst.security_next()) {
3264 Method* m = vfst.method();
3265 // Native frames are not returned
3266 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3267 Klass* holder = m->method_holder();
3268 assert(holder->is_klass(), "just checking");
3269 klass_array->append(holder);
3270 }
3271 }
3272
3273 // Create result array of type [Ljava/lang/Class;
3274 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3275 // Fill in mirrors corresponding to method holders
3276 for (int i = 0; i < klass_array->length(); i++) {
3277 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3278 }
3279
3280 return (jobjectArray) JNIHandles::make_local(env, result);
3281 JVM_END
3282
3283
3284 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3285 JVMWrapper("JVM_ClassDepth");
3286 ResourceMark rm(THREAD);
3287 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3288 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3289
3290 const char* str = java_lang_String::as_utf8_string(class_name_str());
3291 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3292 if (class_name_sym == NULL) {
3293 return -1;
3294 }
3295
3296 int depth = 0;
3297
3298 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3299 if (!vfst.method()->is_native()) {
3300 InstanceKlass* holder = vfst.method()->method_holder();
3301 assert(holder->is_klass(), "just checking");
3302 if (holder->name() == class_name_sym) {
3303 return depth;
3304 }
3305 depth++;
3306 }
3307 }
3308 return -1;
3309 JVM_END
3310
3311
3312 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3313 JVMWrapper("JVM_ClassLoaderDepth");
3314 ResourceMark rm(THREAD);
3315 int depth = 0;
3316 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3317 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3318 bool trusted = is_trusted_frame(thread, &vfst);
3319 if (trusted) return -1;
3320
3321 Method* m = vfst.method();
3322 if (!m->is_native()) {
3323 InstanceKlass* holder = m->method_holder();
3324 assert(holder->is_klass(), "just checking");
3325 oop loader = holder->class_loader();
3326 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3327 return depth;
3328 }
3329 depth++;
3330 }
3331 }
3332 return -1;
3333 JVM_END
3334
3335
3336 // java.lang.Package ////////////////////////////////////////////////////////////////
3337
3338
3339 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3340 JVMWrapper("JVM_GetSystemPackage");
3341 ResourceMark rm(THREAD);
3342 JvmtiVMObjectAllocEventCollector oam;
3343 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3344 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3345 return (jstring) JNIHandles::make_local(result);
3346 JVM_END
3347
3348
3349 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3350 JVMWrapper("JVM_GetSystemPackages");
3351 JvmtiVMObjectAllocEventCollector oam;
3352 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3353 return (jobjectArray) JNIHandles::make_local(result);
3354 JVM_END
3355
3356
3357 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3358
3359
3360 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3361 JVMWrapper("JVM_GetAndClearReferencePendingList");
3362
3363 MonitorLockerEx ml(Heap_lock);
3364 oop ref = Universe::reference_pending_list();
3365 if (ref != NULL) {
3366 Universe::set_reference_pending_list(NULL);
3367 }
3368 return JNIHandles::make_local(env, ref);
3369 JVM_END
3370
3371 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3372 JVMWrapper("JVM_HasReferencePendingList");
3373 MonitorLockerEx ml(Heap_lock);
3374 return Universe::has_reference_pending_list();
3375 JVM_END
3376
3377 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3378 JVMWrapper("JVM_WaitForReferencePendingList");
3379 MonitorLockerEx ml(Heap_lock);
3380 while (!Universe::has_reference_pending_list()) {
3381 ml.wait();
3382 }
3383 JVM_END
3384
3385
3386 // ObjectInputStream ///////////////////////////////////////////////////////////////
3387
3388 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3389 if (current_class == NULL) {
3390 return true;
3391 }
3392 if ((current_class == field_class) || access.is_public()) {
3393 return true;
3394 }
3395
3396 if (access.is_protected()) {
3397 // See if current_class is a subclass of field_class
3398 if (current_class->is_subclass_of(field_class)) {
3399 return true;
3400 }
3401 }
3402
3403 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3404 }
3405
3406 // Return the first user-defined class loader up the execution stack, or null
3407 // if only code from the bootstrap or platform class loader is on the stack.
3408
3409 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3410 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3411 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3412 oop loader = vfst.method()->method_holder()->class_loader();
3413 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3414 return JNIHandles::make_local(env, loader);
3415 }
3416 }
3417 return NULL;
3418 JVM_END
3419
3420
3421 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3422
3423
3424 // resolve array handle and check arguments
3425 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3426 if (arr == NULL) {
3427 THROW_0(vmSymbols::java_lang_NullPointerException());
3428 }
3429 oop a = JNIHandles::resolve_non_null(arr);
3430 if (!a->is_array()) {
3431 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3432 } else if (type_array_only && !a->is_typeArray()) {
3433 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3434 }
3435 return arrayOop(a);
3436 }
3437
3438
3439 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3440 JVMWrapper("JVM_GetArrayLength");
3441 arrayOop a = check_array(env, arr, false, CHECK_0);
3442 return a->length();
3443 JVM_END
3444
3445
3446 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3447 JVMWrapper("JVM_Array_Get");
3448 JvmtiVMObjectAllocEventCollector oam;
3449 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3450 jvalue value;
3451 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3452 oop box = Reflection::box(&value, type, CHECK_NULL);
3453 return JNIHandles::make_local(env, box);
3454 JVM_END
3455
3456
3457 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3458 JVMWrapper("JVM_GetPrimitiveArrayElement");
3459 jvalue value;
3460 value.i = 0; // to initialize value before getting used in CHECK
3461 arrayOop a = check_array(env, arr, true, CHECK_(value));
3462 assert(a->is_typeArray(), "just checking");
3463 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3464 BasicType wide_type = (BasicType) wCode;
3465 if (type != wide_type) {
3466 Reflection::widen(&value, type, wide_type, CHECK_(value));
3467 }
3468 return value;
3469 JVM_END
3470
3471
3472 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3473 JVMWrapper("JVM_SetArrayElement");
3474 arrayOop a = check_array(env, arr, false, CHECK);
3475 oop box = JNIHandles::resolve(val);
3476 jvalue value;
3477 value.i = 0; // to initialize value before getting used in CHECK
3478 BasicType value_type;
3479 if (a->is_objArray()) {
3480 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3481 value_type = Reflection::unbox_for_regular_object(box, &value);
3482 } else {
3483 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3484 }
3485 Reflection::array_set(&value, a, index, value_type, CHECK);
3486 JVM_END
3487
3488
3489 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3490 JVMWrapper("JVM_SetPrimitiveArrayElement");
3491 arrayOop a = check_array(env, arr, true, CHECK);
3492 assert(a->is_typeArray(), "just checking");
3493 BasicType value_type = (BasicType) vCode;
3494 Reflection::array_set(&v, a, index, value_type, CHECK);
3495 JVM_END
3496
3497
3498 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3499 JVMWrapper("JVM_NewArray");
3500 JvmtiVMObjectAllocEventCollector oam;
3501 oop element_mirror = JNIHandles::resolve(eltClass);
3502 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3503 return JNIHandles::make_local(env, result);
3504 JVM_END
3505
3506
3507 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3508 JVMWrapper("JVM_NewMultiArray");
3509 JvmtiVMObjectAllocEventCollector oam;
3510 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3511 oop element_mirror = JNIHandles::resolve(eltClass);
3512 assert(dim_array->is_typeArray(), "just checking");
3513 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3514 return JNIHandles::make_local(env, result);
3515 JVM_END
3516
3517
3518 // Library support ///////////////////////////////////////////////////////////////////////////
3519
3520 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3521 //%note jvm_ct
3522 JVMWrapper("JVM_LoadLibrary");
3523 char ebuf[1024];
3524 void *load_result;
3525 {
3526 ThreadToNativeFromVM ttnfvm(thread);
3527 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3528 }
3529 if (load_result == NULL) {
3530 char msg[1024];
3531 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3532 // Since 'ebuf' may contain a string encoded using
3533 // platform encoding scheme, we need to pass
3534 // Exceptions::unsafe_to_utf8 to the new_exception method
3535 // as the last argument. See bug 6367357.
3536 Handle h_exception =
3537 Exceptions::new_exception(thread,
3538 vmSymbols::java_lang_UnsatisfiedLinkError(),
3539 msg, Exceptions::unsafe_to_utf8);
3540
3541 THROW_HANDLE_0(h_exception);
3542 }
3543 return load_result;
3544 JVM_END
3545
3546
3547 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3548 JVMWrapper("JVM_UnloadLibrary");
3549 os::dll_unload(handle);
3550 JVM_END
3551
3552
3553 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3554 JVMWrapper("JVM_FindLibraryEntry");
3555 return os::dll_lookup(handle, name);
3556 JVM_END
3557
3558
3559 // JNI version ///////////////////////////////////////////////////////////////////////////////
3560
3561 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3562 JVMWrapper("JVM_IsSupportedJNIVersion");
3563 return Threads::is_supported_jni_version_including_1_1(version);
3564 JVM_END
3565
3566
3567 // String support ///////////////////////////////////////////////////////////////////////////
3568
3569 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3570 JVMWrapper("JVM_InternString");
3571 JvmtiVMObjectAllocEventCollector oam;
3572 if (str == NULL) return NULL;
3573 oop string = JNIHandles::resolve_non_null(str);
3574 oop result = StringTable::intern(string, CHECK_NULL);
3575 return (jstring) JNIHandles::make_local(env, result);
3576 JVM_END
3577
3578
3579 // Raw monitor support //////////////////////////////////////////////////////////////////////
3580
3581 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3582 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3583 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3584 // that only works with java threads.
3585
3586
3587 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3588 VM_Exit::block_if_vm_exited();
3589 JVMWrapper("JVM_RawMonitorCreate");
3590 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3591 }
3592
3593
3594 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3595 VM_Exit::block_if_vm_exited();
3596 JVMWrapper("JVM_RawMonitorDestroy");
3597 delete ((Mutex*) mon);
3598 }
3599
3600
3601 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3602 VM_Exit::block_if_vm_exited();
3603 JVMWrapper("JVM_RawMonitorEnter");
3604 ((Mutex*) mon)->jvm_raw_lock();
3605 return 0;
3606 }
3607
3608
3609 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3610 VM_Exit::block_if_vm_exited();
3611 JVMWrapper("JVM_RawMonitorExit");
3612 ((Mutex*) mon)->jvm_raw_unlock();
3613 }
3614
3615
3616 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3617
3618 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3619 Handle loader, Handle protection_domain,
3620 jboolean throwError, TRAPS) {
3621 // Security Note:
3622 // The Java level wrapper will perform the necessary security check allowing
3623 // us to pass the NULL as the initiating class loader. The VM is responsible for
3624 // the checkPackageAccess relative to the initiating class loader via the
3625 // protection_domain. The protection_domain is passed as NULL by the java code
3626 // if there is no security manager in 3-arg Class.forName().
3627 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3628
3629 KlassHandle klass_handle(THREAD, klass);
3630 // Check if we should initialize the class
3631 if (init && klass_handle->is_instance_klass()) {
3632 klass_handle->initialize(CHECK_NULL);
3633 }
3634 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
3635 }
3636
3637
3638 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3639
3640 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3641 JVMWrapper("JVM_InvokeMethod");
3642 Handle method_handle;
3643 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3644 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3645 Handle receiver(THREAD, JNIHandles::resolve(obj));
3646 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3647 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3648 jobject res = JNIHandles::make_local(env, result);
3649 if (JvmtiExport::should_post_vm_object_alloc()) {
3650 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3651 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3652 if (java_lang_Class::is_primitive(ret_type)) {
3653 // Only for primitive type vm allocates memory for java object.
3654 // See box() method.
3655 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3656 }
3657 }
3658 return res;
3659 } else {
3660 THROW_0(vmSymbols::java_lang_StackOverflowError());
3661 }
3662 JVM_END
3663
3664
3665 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3666 JVMWrapper("JVM_NewInstanceFromConstructor");
3667 oop constructor_mirror = JNIHandles::resolve(c);
3668 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3669 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3670 jobject res = JNIHandles::make_local(env, result);
3671 if (JvmtiExport::should_post_vm_object_alloc()) {
3672 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3673 }
3674 return res;
3675 JVM_END
3676
3677 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3678
3679 JVM_LEAF(jboolean, JVM_SupportsCX8())
3680 JVMWrapper("JVM_SupportsCX8");
3681 return VM_Version::supports_cx8();
3682 JVM_END
3683
3684 // Returns an array of all live Thread objects (VM internal JavaThreads,
3685 // jvmti agent threads, and JNI attaching threads are skipped)
3686 // See CR 6404306 regarding JNI attaching threads
3687 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3688 ResourceMark rm(THREAD);
3689 ThreadsListEnumerator tle(THREAD, false, false);
3690 JvmtiVMObjectAllocEventCollector oam;
3691
3692 int num_threads = tle.num_threads();
3693 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3694 objArrayHandle threads_ah(THREAD, r);
3695
3696 for (int i = 0; i < num_threads; i++) {
3697 Handle h = tle.get_threadObj(i);
3698 threads_ah->obj_at_put(i, h());
3699 }
3700
3701 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3702 JVM_END
3703
3704
3705 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3706 // Return StackTraceElement[][], each element is the stack trace of a thread in
3707 // the corresponding entry in the given threads array
3708 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3709 JVMWrapper("JVM_DumpThreads");
3710 JvmtiVMObjectAllocEventCollector oam;
3711
3712 // Check if threads is null
3713 if (threads == NULL) {
3714 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3715 }
3716
3717 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3718 objArrayHandle ah(THREAD, a);
3719 int num_threads = ah->length();
3720 // check if threads is non-empty array
3721 if (num_threads == 0) {
3722 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3723 }
3724
3725 // check if threads is not an array of objects of Thread class
3726 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3727 if (k != SystemDictionary::Thread_klass()) {
3728 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3729 }
3730
3731 ResourceMark rm(THREAD);
3732
3733 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3734 for (int i = 0; i < num_threads; i++) {
3735 oop thread_obj = ah->obj_at(i);
3736 instanceHandle h(THREAD, (instanceOop) thread_obj);
3737 thread_handle_array->append(h);
3738 }
3739
3740 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3741 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3742
3743 JVM_END
3744
3745 // JVM monitoring and management support
3746 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3747 return Management::get_jmm_interface(version);
3748 JVM_END
3749
3750 // com.sun.tools.attach.VirtualMachine agent properties support
3751 //
3752 // Initialize the agent properties with the properties maintained in the VM
3753 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3754 JVMWrapper("JVM_InitAgentProperties");
3755 ResourceMark rm;
3756
3757 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3758
3759 PUTPROP(props, "sun.java.command", Arguments::java_command());
3760 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3761 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3762 return properties;
3763 JVM_END
3764
3765 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3766 {
3767 JVMWrapper("JVM_GetEnclosingMethodInfo");
3768 JvmtiVMObjectAllocEventCollector oam;
3769
3770 if (ofClass == NULL) {
3771 return NULL;
3772 }
3773 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3774 // Special handling for primitive objects
3775 if (java_lang_Class::is_primitive(mirror())) {
3776 return NULL;
3777 }
3778 Klass* k = java_lang_Class::as_Klass(mirror());
3779 if (!k->is_instance_klass()) {
3780 return NULL;
3781 }
3782 instanceKlassHandle ik_h(THREAD, k);
3783 int encl_method_class_idx = ik_h->enclosing_method_class_index();
3784 if (encl_method_class_idx == 0) {
3785 return NULL;
3786 }
3787 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3788 objArrayHandle dest(THREAD, dest_o);
3789 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3790 dest->obj_at_put(0, enc_k->java_mirror());
3791 int encl_method_method_idx = ik_h->enclosing_method_method_index();
3792 if (encl_method_method_idx != 0) {
3793 Symbol* sym = ik_h->constants()->symbol_at(
3794 extract_low_short_from_int(
3795 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3796 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3797 dest->obj_at_put(1, str());
3798 sym = ik_h->constants()->symbol_at(
3799 extract_high_short_from_int(
3800 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3801 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3802 dest->obj_at_put(2, str());
3803 }
3804 return (jobjectArray) JNIHandles::make_local(dest());
3805 }
3806 JVM_END
3807
3808 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3809 {
3810 memset(info, 0, info_size);
3811
3812 info->jvm_version = Abstract_VM_Version::jvm_version();
3813 info->patch_version = Abstract_VM_Version::vm_patch_version();
3814
3815 // when we add a new capability in the jvm_version_info struct, we should also
3816 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3817 // counter defined in runtimeService.cpp.
3818 info->is_attachable = AttachListener::is_attach_supported();
3819 }
3820 JVM_END
3821
3822 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3823 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3824 ResourceMark rm(THREAD);
3825
3826 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3827 return NULL;
3828 }
3829
3830 char** vm_flags = Arguments::jvm_flags_array();
3831 char** vm_args = Arguments::jvm_args_array();
3832 int num_flags = Arguments::num_jvm_flags();
3833 int num_args = Arguments::num_jvm_args();
3834
3835 instanceKlassHandle ik (THREAD, SystemDictionary::String_klass());
3836 objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL);
3837 objArrayHandle result_h(THREAD, r);
3838
3839 int index = 0;
3840 for (int j = 0; j < num_flags; j++, index++) {
3841 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3842 result_h->obj_at_put(index, h());
3843 }
3844 for (int i = 0; i < num_args; i++, index++) {
3845 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3846 result_h->obj_at_put(index, h());
3847 }
3848 return (jobjectArray) JNIHandles::make_local(env, result_h());
3849 JVM_END
3850
3851 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3852 return os::get_signal_number(name);
3853 JVM_END