1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/modules.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/stringTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "gc/shared/collectedHeap.inline.hpp"
39 #include "interpreter/bytecode.hpp"
40 #include "jfr/jfrEvents.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/referenceType.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "memory/universe.hpp"
45 #include "oops/access.inline.hpp"
46 #include "oops/fieldStreams.hpp"
47 #include "oops/instanceKlass.hpp"
48 #include "oops/method.hpp"
49 #include "oops/objArrayKlass.hpp"
50 #include "oops/objArrayOop.inline.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "prims/jvm_misc.hpp"
53 #include "prims/jvmtiExport.hpp"
54 #include "prims/jvmtiThreadState.hpp"
55 #include "prims/nativeLookup.hpp"
56 #include "prims/privilegedStack.hpp"
57 #include "prims/stackwalk.hpp"
58 #include "runtime/arguments.hpp"
59 #include "runtime/atomic.hpp"
60 #include "runtime/handles.inline.hpp"
61 #include "runtime/init.hpp"
62 #include "runtime/interfaceSupport.inline.hpp"
63 #include "runtime/java.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/jfieldIDWorkaround.hpp"
66 #include "runtime/jniHandles.inline.hpp"
67 #include "runtime/orderAccess.inline.hpp"
68 #include "runtime/os.inline.hpp"
69 #include "runtime/perfData.hpp"
70 #include "runtime/reflection.hpp"
71 #include "runtime/thread.inline.hpp"
72 #include "runtime/threadSMR.hpp"
73 #include "runtime/vframe.inline.hpp"
74 #include "runtime/vm_operations.hpp"
75 #include "runtime/vm_version.hpp"
76 #include "runtime/continuation.hpp"
77 #include "services/attachListener.hpp"
78 #include "services/management.hpp"
79 #include "services/threadService.hpp"
80 #include "utilities/copy.hpp"
81 #include "utilities/defaultStream.hpp"
82 #include "utilities/dtrace.hpp"
83 #include "utilities/events.hpp"
84 #include "utilities/histogram.hpp"
85 #include "utilities/macros.hpp"
86 #include "utilities/utf8.hpp"
87 #if INCLUDE_CDS
88 #include "classfile/systemDictionaryShared.hpp"
89 #endif
90
91 #include <errno.h>
92
93 /*
94 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
95 such ctors and calls MUST NOT come between an oop declaration/init and its
96 usage because if objects are move this may cause various memory stomps, bus
97 errors and segfaults. Here is a cookbook for causing so called "naked oop
98 failures":
99
100 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
101 JVMWrapper("JVM_GetClassDeclaredFields");
102
103 // Object address to be held directly in mirror & not visible to GC
104 oop mirror = JNIHandles::resolve_non_null(ofClass);
105
106 // If this ctor can hit a safepoint, moving objects around, then
107 ComplexConstructor foo;
108
109 // Boom! mirror may point to JUNK instead of the intended object
110 (some dereference of mirror)
111
112 // Here's another call that may block for GC, making mirror stale
113 MutexLocker ml(some_lock);
114
115 // And here's an initializer that can result in a stale oop
116 // all in one step.
117 oop o = call_that_can_throw_exception(TRAPS);
118
119
120 The solution is to keep the oop declaration BELOW the ctor or function
121 call that might cause a GC, do another resolve to reassign the oop, or
122 consider use of a Handle instead of an oop so there is immunity from object
123 motion. But note that the "QUICK" entries below do not have a handlemark
124 and thus can only support use of handles passed in.
125 */
126
127 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
128 ResourceMark rm;
129 int line_number = -1;
130 const char * source_file = NULL;
131 const char * trace = "explicit";
132 InstanceKlass* caller = NULL;
133 JavaThread* jthread = JavaThread::current();
134 if (jthread->has_last_Java_frame()) {
135 vframeStream vfst(jthread);
136
137 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
138 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
139 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
140 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
141 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
142
143 Method* last_caller = NULL;
144
145 while (!vfst.at_end()) {
146 Method* m = vfst.method();
147 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
148 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
149 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
150 break;
151 }
152 last_caller = m;
153 vfst.next();
154 }
155 // if this is called from Class.forName0 and that is called from Class.forName,
156 // then print the caller of Class.forName. If this is Class.loadClass, then print
157 // that caller, otherwise keep quiet since this should be picked up elsewhere.
158 bool found_it = false;
159 if (!vfst.at_end() &&
160 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
161 vfst.method()->name() == vmSymbols::forName0_name()) {
162 vfst.next();
163 if (!vfst.at_end() &&
164 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
165 vfst.method()->name() == vmSymbols::forName_name()) {
166 vfst.next();
167 found_it = true;
168 }
169 } else if (last_caller != NULL &&
170 last_caller->method_holder()->name() ==
171 vmSymbols::java_lang_ClassLoader() &&
172 last_caller->name() == vmSymbols::loadClass_name()) {
173 found_it = true;
174 } else if (!vfst.at_end()) {
175 if (vfst.method()->is_native()) {
176 // JNI call
177 found_it = true;
178 }
179 }
180 if (found_it && !vfst.at_end()) {
181 // found the caller
182 caller = vfst.method()->method_holder();
183 line_number = vfst.method()->line_number_from_bci(vfst.bci());
184 if (line_number == -1) {
185 // show method name if it's a native method
186 trace = vfst.method()->name_and_sig_as_C_string();
187 }
188 Symbol* s = caller->source_file_name();
189 if (s != NULL) {
190 source_file = s->as_C_string();
191 }
192 }
193 }
194 if (caller != NULL) {
195 if (to_class != caller) {
196 const char * from = caller->external_name();
197 const char * to = to_class->external_name();
198 // print in a single call to reduce interleaving between threads
199 if (source_file != NULL) {
200 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
201 } else {
202 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
203 }
204 }
205 }
206 }
207
208 void trace_class_resolution(Klass* to_class) {
209 EXCEPTION_MARK;
210 trace_class_resolution_impl(to_class, THREAD);
211 if (HAS_PENDING_EXCEPTION) {
212 CLEAR_PENDING_EXCEPTION;
213 }
214 }
215
216 // Wrapper to trace JVM functions
217
218 #ifdef ASSERT
219 Histogram* JVMHistogram;
220 volatile int JVMHistogram_lock = 0;
221
222 class JVMHistogramElement : public HistogramElement {
223 public:
224 JVMHistogramElement(const char* name);
225 };
226
227 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
228 _name = elementName;
229 uintx count = 0;
230
231 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
232 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
233 count +=1;
234 if ( (WarnOnStalledSpinLock > 0)
235 && (count % WarnOnStalledSpinLock == 0)) {
236 warning("JVMHistogram_lock seems to be stalled");
237 }
238 }
239 }
240
241 if(JVMHistogram == NULL)
242 JVMHistogram = new Histogram("JVM Call Counts",100);
243
244 JVMHistogram->add_element(this);
245 Atomic::dec(&JVMHistogram_lock);
246 }
247
248 #define JVMCountWrapper(arg) \
249 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
250 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
251
252 #define JVMWrapper(arg) JVMCountWrapper(arg);
253 #else
254 #define JVMWrapper(arg)
255 #endif
256
257
258 // Interface version /////////////////////////////////////////////////////////////////////
259
260
261 JVM_LEAF(jint, JVM_GetInterfaceVersion())
262 return JVM_INTERFACE_VERSION;
263 JVM_END
264
265
266 // java.lang.System //////////////////////////////////////////////////////////////////////
267
268
269 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
270 JVMWrapper("JVM_CurrentTimeMillis");
271 return os::javaTimeMillis();
272 JVM_END
273
274 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
275 JVMWrapper("JVM_NanoTime");
276 return os::javaTimeNanos();
277 JVM_END
278
279 // The function below is actually exposed by jdk.internal.misc.VM and not
280 // java.lang.System, but we choose to keep it here so that it stays next
281 // to JVM_CurrentTimeMillis and JVM_NanoTime
282
283 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
284 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
285
286 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
287 JVMWrapper("JVM_GetNanoTimeAdjustment");
288 jlong seconds;
289 jlong nanos;
290
291 os::javaTimeSystemUTC(seconds, nanos);
292
293 // We're going to verify that the result can fit in a long.
294 // For that we need the difference in seconds between 'seconds'
295 // and 'offset_secs' to be such that:
296 // |seconds - offset_secs| < (2^63/10^9)
297 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
298 // which makes |seconds - offset_secs| < 2^33
299 // and we will prefer +/- 2^32 as the maximum acceptable diff
300 // as 2^32 has a more natural feel than 2^33...
301 //
302 // So if |seconds - offset_secs| >= 2^32 - we return a special
303 // sentinel value (-1) which the caller should take as an
304 // exception value indicating that the offset given to us is
305 // too far from range of the current time - leading to too big
306 // a nano adjustment. The caller is expected to recover by
307 // computing a more accurate offset and calling this method
308 // again. (For the record 2^32 secs is ~136 years, so that
309 // should rarely happen)
310 //
311 jlong diff = seconds - offset_secs;
312 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
313 return -1; // sentinel value: the offset is too far off the target
314 }
315
316 // return the adjustment. If you compute a time by adding
317 // this number of nanoseconds along with the number of seconds
318 // in the offset you should get the current UTC time.
319 return (diff * (jlong)1000000000) + nanos;
320 JVM_END
321
322 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
323 jobject dst, jint dst_pos, jint length))
324 JVMWrapper("JVM_ArrayCopy");
325 // Check if we have null pointers
326 if (src == NULL || dst == NULL) {
327 THROW(vmSymbols::java_lang_NullPointerException());
328 }
329 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
330 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
331 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
332 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
333 // Do copy
334 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
335 JVM_END
336
337
338 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
339 JavaValue r(T_OBJECT);
340 // public synchronized Object put(Object key, Object value);
341 HandleMark hm(THREAD);
342 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
343 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
344 JavaCalls::call_virtual(&r,
345 props,
346 SystemDictionary::Properties_klass(),
347 vmSymbols::put_name(),
348 vmSymbols::object_object_object_signature(),
349 key_str,
350 value_str,
351 THREAD);
352 }
353
354
355 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
356
357
358 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
359 JVMWrapper("JVM_InitProperties");
360 ResourceMark rm;
361
362 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
363
364 // System property list includes both user set via -D option and
365 // jvm system specific properties.
366 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
367 PUTPROP(props, p->key(), p->value());
368 }
369
370 // Convert the -XX:MaxDirectMemorySize= command line flag
371 // to the sun.nio.MaxDirectMemorySize property.
372 // Do this after setting user properties to prevent people
373 // from setting the value with a -D option, as requested.
374 {
375 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
376 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
377 } else {
378 char as_chars[256];
379 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
380 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
381 }
382 }
383
384 // JVM monitoring and management support
385 // Add the sun.management.compiler property for the compiler's name
386 {
387 #undef CSIZE
388 #if defined(_LP64) || defined(_WIN64)
389 #define CSIZE "64-Bit "
390 #else
391 #define CSIZE
392 #endif // 64bit
393
394 #ifdef TIERED
395 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
396 #else
397 #if defined(COMPILER1)
398 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
399 #elif defined(COMPILER2)
400 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
401 #elif INCLUDE_JVMCI
402 #error "INCLUDE_JVMCI should imply TIERED"
403 #else
404 const char* compiler_name = "";
405 #endif // compilers
406 #endif // TIERED
407
408 if (*compiler_name != '\0' &&
409 (Arguments::mode() != Arguments::_int)) {
410 PUTPROP(props, "sun.management.compiler", compiler_name);
411 }
412 }
413
414 return properties;
415 JVM_END
416
417
418 /*
419 * Return the temporary directory that the VM uses for the attach
420 * and perf data files.
421 *
422 * It is important that this directory is well-known and the
423 * same for all VM instances. It cannot be affected by configuration
424 * variables such as java.io.tmpdir.
425 */
426 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
427 JVMWrapper("JVM_GetTemporaryDirectory");
428 HandleMark hm(THREAD);
429 const char* temp_dir = os::get_temp_directory();
430 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
431 return (jstring) JNIHandles::make_local(env, h());
432 JVM_END
433
434
435 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
436
437 extern volatile jint vm_created;
438
439 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
440 JVMWrapper("JVM_BeforeHalt");
441 EventShutdown event;
442 if (event.should_commit()) {
443 event.set_reason("Shutdown requested from Java");
444 event.commit();
445 }
446 JVM_END
447
448
449 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
450 before_exit(thread);
451 vm_exit(code);
452 JVM_END
453
454
455 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
456 JVMWrapper("JVM_GC");
457 if (!DisableExplicitGC) {
458 Universe::heap()->collect(GCCause::_java_lang_system_gc);
459 }
460 JVM_END
461
462
463 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
464 JVMWrapper("JVM_MaxObjectInspectionAge");
465 return Universe::heap()->millis_since_last_gc();
466 JVM_END
467
468
469 static inline jlong convert_size_t_to_jlong(size_t val) {
470 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
471 NOT_LP64 (return (jlong)val;)
472 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
473 }
474
475 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
476 JVMWrapper("JVM_TotalMemory");
477 size_t n = Universe::heap()->capacity();
478 return convert_size_t_to_jlong(n);
479 JVM_END
480
481
482 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
483 JVMWrapper("JVM_FreeMemory");
484 CollectedHeap* ch = Universe::heap();
485 size_t n;
486 {
487 MutexLocker x(Heap_lock);
488 n = ch->capacity() - ch->used();
489 }
490 return convert_size_t_to_jlong(n);
491 JVM_END
492
493
494 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
495 JVMWrapper("JVM_MaxMemory");
496 size_t n = Universe::heap()->max_capacity();
497 return convert_size_t_to_jlong(n);
498 JVM_END
499
500
501 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
502 JVMWrapper("JVM_ActiveProcessorCount");
503 return os::active_processor_count();
504 JVM_END
505
506
507
508 // java.lang.Throwable //////////////////////////////////////////////////////
509
510
511 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
512 JVMWrapper("JVM_FillInStackTrace");
513 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
514 java_lang_Throwable::fill_in_stack_trace(exception);
515 JVM_END
516
517
518 // java.lang.StackTraceElement //////////////////////////////////////////////
519
520
521 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
522 JVMWrapper("JVM_InitStackTraceElementArray");
523 Handle exception(THREAD, JNIHandles::resolve(throwable));
524 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
525 objArrayHandle stack_trace(THREAD, st);
526 // Fill in the allocated stack trace
527 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
528 JVM_END
529
530
531 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
532 JVMWrapper("JVM_InitStackTraceElement");
533 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
534 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
535 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
536 JVM_END
537
538
539 // java.lang.StackWalker //////////////////////////////////////////////////////
540
541
542 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
543 jint skip_frames, jint frame_count, jint start_index,
544 jobjectArray frames))
545 JVMWrapper("JVM_CallStackWalk");
546 JavaThread* jt = (JavaThread*) THREAD;
547 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
548 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
549 }
550
551 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
552
553 // frames array is a Class<?>[] array when only getting caller reference,
554 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
555 // be null.
556 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
557 objArrayHandle frames_array_h(THREAD, fa);
558
559 int limit = start_index + frame_count;
560 if (frames_array_h->length() < limit) {
561 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
562 }
563
564 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
565 start_index, frames_array_h, CHECK_NULL);
566 return JNIHandles::make_local(env, result);
567 JVM_END
568
569
570 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
571 jint frame_count, jint start_index,
572 jobjectArray frames))
573 JVMWrapper("JVM_MoreStackWalk");
574 JavaThread* jt = (JavaThread*) THREAD;
575
576 // frames array is a Class<?>[] array when only getting caller reference,
577 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
578 // be null.
579 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
580 objArrayHandle frames_array_h(THREAD, fa);
581
582 int limit = start_index+frame_count;
583 if (frames_array_h->length() < limit) {
584 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
585 }
586
587 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
588 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
589 start_index, frames_array_h, THREAD);
590 JVM_END
591
592 // java.lang.Object ///////////////////////////////////////////////
593
594
595 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
596 JVMWrapper("JVM_IHashCode");
597 // as implemented in the classic virtual machine; return 0 if object is NULL
598 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
599 JVM_END
600
601
602 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
603 JVMWrapper("JVM_MonitorWait");
604 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
605 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
606 if (JvmtiExport::should_post_monitor_wait()) {
607 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
608
609 // The current thread already owns the monitor and it has not yet
610 // been added to the wait queue so the current thread cannot be
611 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
612 // event handler cannot accidentally consume an unpark() meant for
613 // the ParkEvent associated with this ObjectMonitor.
614 }
615 ObjectSynchronizer::wait(obj, ms, CHECK);
616 JVM_END
617
618
619 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
620 JVMWrapper("JVM_MonitorNotify");
621 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
622 ObjectSynchronizer::notify(obj, CHECK);
623 JVM_END
624
625
626 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
627 JVMWrapper("JVM_MonitorNotifyAll");
628 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
629 ObjectSynchronizer::notifyall(obj, CHECK);
630 JVM_END
631
632
633 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
634 JVMWrapper("JVM_Clone");
635 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
636 Klass* klass = obj->klass();
637 JvmtiVMObjectAllocEventCollector oam;
638
639 #ifdef ASSERT
640 // Just checking that the cloneable flag is set correct
641 if (obj->is_array()) {
642 guarantee(klass->is_cloneable(), "all arrays are cloneable");
643 } else {
644 guarantee(obj->is_instance(), "should be instanceOop");
645 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
646 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
647 }
648 #endif
649
650 // Check if class of obj supports the Cloneable interface.
651 // All arrays are considered to be cloneable (See JLS 20.1.5).
652 // All j.l.r.Reference classes are considered non-cloneable.
653 if (!klass->is_cloneable() ||
654 (klass->is_instance_klass() &&
655 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
656 ResourceMark rm(THREAD);
657 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
658 }
659
660 // Make shallow object copy
661 const int size = obj->size();
662 oop new_obj_oop = NULL;
663 if (obj->is_array()) {
664 const int length = ((arrayOop)obj())->length();
665 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
666 } else {
667 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
668 }
669
670 HeapAccess<>::clone(obj(), new_obj_oop, size);
671
672 Handle new_obj(THREAD, new_obj_oop);
673 // Caution: this involves a java upcall, so the clone should be
674 // "gc-robust" by this stage.
675 if (klass->has_finalizer()) {
676 assert(obj->is_instance(), "should be instanceOop");
677 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
678 new_obj = Handle(THREAD, new_obj_oop);
679 }
680
681 return JNIHandles::make_local(env, new_obj());
682 JVM_END
683
684 // java.lang.Continuation /////////////////////////////////////////////////////
685
686 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
687 CONT_RegisterNativeMethods(env, cls);
688 JVM_END
689
690 // java.io.File ///////////////////////////////////////////////////////////////
691
692 JVM_LEAF(char*, JVM_NativePath(char* path))
693 JVMWrapper("JVM_NativePath");
694 return os::native_path(path);
695 JVM_END
696
697
698 // Misc. class handling ///////////////////////////////////////////////////////////
699
700
701 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
702 JVMWrapper("JVM_GetCallerClass");
703
704 // Getting the class of the caller frame.
705 //
706 // The call stack at this point looks something like this:
707 //
708 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
709 // [1] [ @CallerSensitive API.method ]
710 // [.] [ (skipped intermediate frames) ]
711 // [n] [ caller ]
712 vframeStream vfst(thread);
713 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
714 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
715 Method* m = vfst.method();
716 assert(m != NULL, "sanity");
717 switch (n) {
718 case 0:
719 // This must only be called from Reflection.getCallerClass
720 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
721 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
722 }
723 // fall-through
724 case 1:
725 // Frame 0 and 1 must be caller sensitive.
726 if (!m->caller_sensitive()) {
727 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
728 }
729 break;
730 default:
731 if (!m->is_ignored_by_security_stack_walk()) {
732 // We have reached the desired frame; return the holder class.
733 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
734 }
735 break;
736 }
737 }
738 return NULL;
739 JVM_END
740
741
742 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
743 JVMWrapper("JVM_FindPrimitiveClass");
744 oop mirror = NULL;
745 BasicType t = name2type(utf);
746 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
747 mirror = Universe::java_mirror(t);
748 }
749 if (mirror == NULL) {
750 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
751 } else {
752 return (jclass) JNIHandles::make_local(env, mirror);
753 }
754 JVM_END
755
756
757 // Returns a class loaded by the bootstrap class loader; or null
758 // if not found. ClassNotFoundException is not thrown.
759 // FindClassFromBootLoader is exported to the launcher for windows.
760 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
761 const char* name))
762 JVMWrapper("JVM_FindClassFromBootLoader");
763
764 // Java libraries should ensure that name is never null...
765 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
766 // It's impossible to create this class; the name cannot fit
767 // into the constant pool.
768 return NULL;
769 }
770
771 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
772 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
773 if (k == NULL) {
774 return NULL;
775 }
776
777 if (log_is_enabled(Debug, class, resolve)) {
778 trace_class_resolution(k);
779 }
780 return (jclass) JNIHandles::make_local(env, k->java_mirror());
781 JVM_END
782
783 // Find a class with this name in this loader, using the caller's protection domain.
784 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
785 jboolean init, jobject loader,
786 jclass caller))
787 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
788 // Java libraries should ensure that name is never null...
789 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
790 // It's impossible to create this class; the name cannot fit
791 // into the constant pool.
792 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
793 }
794
795 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
796
797 oop loader_oop = JNIHandles::resolve(loader);
798 oop from_class = JNIHandles::resolve(caller);
799 oop protection_domain = NULL;
800 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
801 // NPE. Put it in another way, the bootstrap class loader has all permission and
802 // thus no checkPackageAccess equivalence in the VM class loader.
803 // The caller is also passed as NULL by the java code if there is no security
804 // manager to avoid the performance cost of getting the calling class.
805 if (from_class != NULL && loader_oop != NULL) {
806 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
807 }
808
809 Handle h_loader(THREAD, loader_oop);
810 Handle h_prot(THREAD, protection_domain);
811 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
812 h_prot, false, THREAD);
813
814 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
815 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
816 }
817 return result;
818 JVM_END
819
820 // Currently only called from the old verifier.
821 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
822 jboolean init, jclass from))
823 JVMWrapper("JVM_FindClassFromClass");
824 if (name == NULL) {
825 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
826 }
827 if ((int)strlen(name) > Symbol::max_length()) {
828 // It's impossible to create this class; the name cannot fit
829 // into the constant pool.
830 Exceptions::fthrow(THREAD_AND_LOCATION,
831 vmSymbols::java_lang_NoClassDefFoundError(),
832 "Class name exceeds maximum length of %d: %s",
833 Symbol::max_length(),
834 name);
835 return 0;
836 }
837 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
838 oop from_class_oop = JNIHandles::resolve(from);
839 Klass* from_class = (from_class_oop == NULL)
840 ? (Klass*)NULL
841 : java_lang_Class::as_Klass(from_class_oop);
842 oop class_loader = NULL;
843 oop protection_domain = NULL;
844 if (from_class != NULL) {
845 class_loader = from_class->class_loader();
846 protection_domain = from_class->protection_domain();
847 }
848 Handle h_loader(THREAD, class_loader);
849 Handle h_prot (THREAD, protection_domain);
850 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
851 h_prot, true, thread);
852 if (result != NULL) {
853 oop mirror = JNIHandles::resolve_non_null(result);
854 Klass* to_class = java_lang_Class::as_Klass(mirror);
855 ClassLoaderData::class_loader_data(h_loader())->record_dependency(to_class);
856 }
857
858 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
859 // this function is generally only used for class loading during verification.
860 ResourceMark rm;
861 oop from_mirror = JNIHandles::resolve_non_null(from);
862 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
863 const char * from_name = from_class->external_name();
864
865 oop mirror = JNIHandles::resolve_non_null(result);
866 Klass* to_class = java_lang_Class::as_Klass(mirror);
867 const char * to = to_class->external_name();
868 log_debug(class, resolve)("%s %s (verification)", from_name, to);
869 }
870
871 return result;
872 JVM_END
873
874 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
875 if (loader.is_null()) {
876 return;
877 }
878
879 // check whether the current caller thread holds the lock or not.
880 // If not, increment the corresponding counter
881 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
882 ObjectSynchronizer::owner_self) {
883 counter->inc();
884 }
885 }
886
887 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
888 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
889 jobject loader, const jbyte *buf,
890 jsize len, jobject pd, const char *source,
891 TRAPS) {
892 if (source == NULL) source = "__JVM_DefineClass__";
893
894 assert(THREAD->is_Java_thread(), "must be a JavaThread");
895 JavaThread* jt = (JavaThread*) THREAD;
896
897 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
898 ClassLoader::perf_define_appclass_selftime(),
899 ClassLoader::perf_define_appclasses(),
900 jt->get_thread_stat()->perf_recursion_counts_addr(),
901 jt->get_thread_stat()->perf_timers_addr(),
902 PerfClassTraceTime::DEFINE_CLASS);
903
904 if (UsePerfData) {
905 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
906 }
907
908 // Since exceptions can be thrown, class initialization can take place
909 // if name is NULL no check for class name in .class stream has to be made.
910 TempNewSymbol class_name = NULL;
911 if (name != NULL) {
912 const int str_len = (int)strlen(name);
913 if (str_len > Symbol::max_length()) {
914 // It's impossible to create this class; the name cannot fit
915 // into the constant pool.
916 Exceptions::fthrow(THREAD_AND_LOCATION,
917 vmSymbols::java_lang_NoClassDefFoundError(),
918 "Class name exceeds maximum length of %d: %s",
919 Symbol::max_length(),
920 name);
921 return 0;
922 }
923 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
924 }
925
926 ResourceMark rm(THREAD);
927 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
928 Handle class_loader (THREAD, JNIHandles::resolve(loader));
929 if (UsePerfData) {
930 is_lock_held_by_thread(class_loader,
931 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
932 THREAD);
933 }
934 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
935 Klass* k = SystemDictionary::resolve_from_stream(class_name,
936 class_loader,
937 protection_domain,
938 &st,
939 CHECK_NULL);
940
941 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
942 trace_class_resolution(k);
943 }
944
945 return (jclass) JNIHandles::make_local(env, k->java_mirror());
946 }
947
948
949 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
950 JVMWrapper("JVM_DefineClass");
951
952 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
953 JVM_END
954
955
956 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
957 JVMWrapper("JVM_DefineClassWithSource");
958
959 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
960 JVM_END
961
962 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
963 JVMWrapper("JVM_FindLoadedClass");
964 ResourceMark rm(THREAD);
965
966 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
967 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
968
969 const char* str = java_lang_String::as_utf8_string(string());
970 // Sanity check, don't expect null
971 if (str == NULL) return NULL;
972
973 const int str_len = (int)strlen(str);
974 if (str_len > Symbol::max_length()) {
975 // It's impossible to create this class; the name cannot fit
976 // into the constant pool.
977 return NULL;
978 }
979 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
980
981 // Security Note:
982 // The Java level wrapper will perform the necessary security check allowing
983 // us to pass the NULL as the initiating class loader.
984 Handle h_loader(THREAD, JNIHandles::resolve(loader));
985 if (UsePerfData) {
986 is_lock_held_by_thread(h_loader,
987 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
988 THREAD);
989 }
990
991 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
992 h_loader,
993 Handle(),
994 CHECK_NULL);
995 #if INCLUDE_CDS
996 if (k == NULL) {
997 // If the class is not already loaded, try to see if it's in the shared
998 // archive for the current classloader (h_loader).
999 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1000 }
1001 #endif
1002 return (k == NULL) ? NULL :
1003 (jclass) JNIHandles::make_local(env, k->java_mirror());
1004 JVM_END
1005
1006 // Module support //////////////////////////////////////////////////////////////////////////////
1007
1008 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1009 jstring location, const char* const* packages, jsize num_packages))
1010 JVMWrapper("JVM_DefineModule");
1011 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1012 JVM_END
1013
1014 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1015 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1016 Modules::set_bootloader_unnamed_module(module, CHECK);
1017 JVM_END
1018
1019 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1020 JVMWrapper("JVM_AddModuleExports");
1021 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1022 JVM_END
1023
1024 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1025 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1026 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1027 JVM_END
1028
1029 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1030 JVMWrapper("JVM_AddModuleExportsToAll");
1031 Modules::add_module_exports(from_module, package, NULL, CHECK);
1032 JVM_END
1033
1034 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1035 JVMWrapper("JVM_AddReadsModule");
1036 Modules::add_reads_module(from_module, source_module, CHECK);
1037 JVM_END
1038
1039 // Reflection support //////////////////////////////////////////////////////////////////////////////
1040
1041 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1042 assert (cls != NULL, "illegal class");
1043 JVMWrapper("JVM_GetClassName");
1044 JvmtiVMObjectAllocEventCollector oam;
1045 ResourceMark rm(THREAD);
1046 const char* name;
1047 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1048 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1049 } else {
1050 // Consider caching interned string in Klass
1051 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1052 assert(k->is_klass(), "just checking");
1053 name = k->external_name();
1054 }
1055 oop result = StringTable::intern((char*) name, CHECK_NULL);
1056 return (jstring) JNIHandles::make_local(env, result);
1057 JVM_END
1058
1059
1060 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1061 JVMWrapper("JVM_GetClassInterfaces");
1062 JvmtiVMObjectAllocEventCollector oam;
1063 oop mirror = JNIHandles::resolve_non_null(cls);
1064
1065 // Special handling for primitive objects
1066 if (java_lang_Class::is_primitive(mirror)) {
1067 // Primitive objects does not have any interfaces
1068 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1069 return (jobjectArray) JNIHandles::make_local(env, r);
1070 }
1071
1072 Klass* klass = java_lang_Class::as_Klass(mirror);
1073 // Figure size of result array
1074 int size;
1075 if (klass->is_instance_klass()) {
1076 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1077 } else {
1078 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1079 size = 2;
1080 }
1081
1082 // Allocate result array
1083 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1084 objArrayHandle result (THREAD, r);
1085 // Fill in result
1086 if (klass->is_instance_klass()) {
1087 // Regular instance klass, fill in all local interfaces
1088 for (int index = 0; index < size; index++) {
1089 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1090 result->obj_at_put(index, k->java_mirror());
1091 }
1092 } else {
1093 // All arrays implement java.lang.Cloneable and java.io.Serializable
1094 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1095 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1096 }
1097 return (jobjectArray) JNIHandles::make_local(env, result());
1098 JVM_END
1099
1100
1101 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1102 JVMWrapper("JVM_IsInterface");
1103 oop mirror = JNIHandles::resolve_non_null(cls);
1104 if (java_lang_Class::is_primitive(mirror)) {
1105 return JNI_FALSE;
1106 }
1107 Klass* k = java_lang_Class::as_Klass(mirror);
1108 jboolean result = k->is_interface();
1109 assert(!result || k->is_instance_klass(),
1110 "all interfaces are instance types");
1111 // The compiler intrinsic for isInterface tests the
1112 // Klass::_access_flags bits in the same way.
1113 return result;
1114 JVM_END
1115
1116
1117 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1118 JVMWrapper("JVM_GetClassSigners");
1119 JvmtiVMObjectAllocEventCollector oam;
1120 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1121 // There are no signers for primitive types
1122 return NULL;
1123 }
1124
1125 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1126
1127 // If there are no signers set in the class, or if the class
1128 // is an array, return NULL.
1129 if (signers == NULL) return NULL;
1130
1131 // copy of the signers array
1132 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1133 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1134 for (int index = 0; index < signers->length(); index++) {
1135 signers_copy->obj_at_put(index, signers->obj_at(index));
1136 }
1137
1138 // return the copy
1139 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1140 JVM_END
1141
1142
1143 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1144 JVMWrapper("JVM_SetClassSigners");
1145 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1146 // This call is ignored for primitive types and arrays.
1147 // Signers are only set once, ClassLoader.java, and thus shouldn't
1148 // be called with an array. Only the bootstrap loader creates arrays.
1149 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1150 if (k->is_instance_klass()) {
1151 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1152 }
1153 }
1154 JVM_END
1155
1156
1157 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1158 JVMWrapper("JVM_GetProtectionDomain");
1159 if (JNIHandles::resolve(cls) == NULL) {
1160 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1161 }
1162
1163 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1164 // Primitive types does not have a protection domain.
1165 return NULL;
1166 }
1167
1168 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1169 return (jobject) JNIHandles::make_local(env, pd);
1170 JVM_END
1171
1172
1173 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) {
1174 // If there is a security manager and protection domain, check the access
1175 // in the protection domain, otherwise it is authorized.
1176 if (java_lang_System::has_security_manager()) {
1177
1178 // For bootstrapping, if pd implies method isn't in the JDK, allow
1179 // this context to revert to older behavior.
1180 // In this case the isAuthorized field in AccessControlContext is also not
1181 // present.
1182 if (Universe::protection_domain_implies_method() == NULL) {
1183 return true;
1184 }
1185
1186 // Whitelist certain access control contexts
1187 if (java_security_AccessControlContext::is_authorized(context)) {
1188 return true;
1189 }
1190
1191 oop prot = klass->protection_domain();
1192 if (prot != NULL) {
1193 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1194 // in the new wrapper.
1195 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1196 Handle h_prot(THREAD, prot);
1197 JavaValue result(T_BOOLEAN);
1198 JavaCallArguments args(h_prot);
1199 JavaCalls::call(&result, m, &args, CHECK_false);
1200 return (result.get_jboolean() != 0);
1201 }
1202 }
1203 return true;
1204 }
1205
1206 // Create an AccessControlContext with a protection domain with null codesource
1207 // and null permissions - which gives no permissions.
1208 oop create_dummy_access_control_context(TRAPS) {
1209 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1210 // Call constructor ProtectionDomain(null, null);
1211 Handle obj = JavaCalls::construct_new_instance(pd_klass,
1212 vmSymbols::codesource_permissioncollection_signature(),
1213 Handle(), Handle(), CHECK_NULL);
1214
1215 // new ProtectionDomain[] {pd};
1216 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1217 context->obj_at_put(0, obj());
1218
1219 // new AccessControlContext(new ProtectionDomain[] {pd})
1220 objArrayHandle h_context(THREAD, context);
1221 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1222 return acc;
1223 }
1224
1225 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1226 JVMWrapper("JVM_DoPrivileged");
1227
1228 if (action == NULL) {
1229 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1230 }
1231
1232 // Compute the frame initiating the do privileged operation and setup the privileged stack
1233 vframeStream vfst(thread);
1234 vfst.security_get_caller_frame(1);
1235
1236 if (vfst.at_end()) {
1237 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1238 }
1239
1240 Method* method = vfst.method();
1241 InstanceKlass* klass = method->method_holder();
1242
1243 // Check that action object understands "Object run()"
1244 Handle h_context;
1245 if (context != NULL) {
1246 h_context = Handle(THREAD, JNIHandles::resolve(context));
1247 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1248 if (!authorized) {
1249 // Create an unprivileged access control object and call it's run function
1250 // instead.
1251 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1252 h_context = Handle(THREAD, noprivs);
1253 }
1254 }
1255
1256 // Check that action object understands "Object run()"
1257 Handle object (THREAD, JNIHandles::resolve(action));
1258
1259 // get run() method
1260 Method* m_oop = object->klass()->uncached_lookup_method(
1261 vmSymbols::run_method_name(),
1262 vmSymbols::void_object_signature(),
1263 Klass::find_overpass);
1264
1265 // See if there is a default method for "Object run()".
1266 if (m_oop == NULL && object->klass()->is_instance_klass()) {
1267 InstanceKlass* iklass = InstanceKlass::cast(object->klass());
1268 m_oop = iklass->lookup_method_in_ordered_interfaces(
1269 vmSymbols::run_method_name(),
1270 vmSymbols::void_object_signature());
1271 }
1272
1273 methodHandle m (THREAD, m_oop);
1274 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) {
1275 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1276 }
1277
1278 // Stack allocated list of privileged stack elements
1279 PrivilegedElement pi;
1280 if (!vfst.at_end()) {
1281 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1282 thread->set_privileged_stack_top(&pi);
1283 }
1284
1285
1286 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1287 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1288 Handle pending_exception;
1289 JavaValue result(T_OBJECT);
1290 JavaCallArguments args(object);
1291 JavaCalls::call(&result, m, &args, THREAD);
1292
1293 // done with action, remove ourselves from the list
1294 if (!vfst.at_end()) {
1295 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1296 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1297 }
1298
1299 if (HAS_PENDING_EXCEPTION) {
1300 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1301 CLEAR_PENDING_EXCEPTION;
1302 // JVMTI has already reported the pending exception
1303 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1304 if (THREAD->is_Java_thread()) {
1305 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1306 }
1307 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1308 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1309 // Throw a java.security.PrivilegedActionException(Exception e) exception
1310 JavaCallArguments args(pending_exception);
1311 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1312 vmSymbols::exception_void_signature(),
1313 &args);
1314 }
1315 }
1316
1317 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1318 return JNIHandles::make_local(env, (oop) result.get_jobject());
1319 JVM_END
1320
1321
1322 // Returns the inherited_access_control_context field of the running thread.
1323 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1324 JVMWrapper("JVM_GetInheritedAccessControlContext");
1325 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1326 return JNIHandles::make_local(env, result);
1327 JVM_END
1328
1329 class RegisterArrayForGC {
1330 private:
1331 JavaThread *_thread;
1332 public:
1333 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1334 _thread = thread;
1335 _thread->register_array_for_gc(array);
1336 }
1337
1338 ~RegisterArrayForGC() {
1339 _thread->register_array_for_gc(NULL);
1340 }
1341 };
1342
1343
1344 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1345 JVMWrapper("JVM_GetStackAccessControlContext");
1346 if (!UsePrivilegedStack) return NULL;
1347
1348 ResourceMark rm(THREAD);
1349 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1350 JvmtiVMObjectAllocEventCollector oam;
1351
1352 // count the protection domains on the execution stack. We collapse
1353 // duplicate consecutive protection domains into a single one, as
1354 // well as stopping when we hit a privileged frame.
1355
1356 // Use vframeStream to iterate through Java frames
1357 vframeStream vfst(thread);
1358
1359 oop previous_protection_domain = NULL;
1360 Handle privileged_context(thread, NULL);
1361 bool is_privileged = false;
1362 oop protection_domain = NULL;
1363
1364 for(; !vfst.at_end(); vfst.next()) {
1365 // get method of frame
1366 Method* method = vfst.method();
1367 intptr_t* frame_id = vfst.frame_id();
1368
1369 // check the privileged frames to see if we have a match
1370 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1371 // this frame is privileged
1372 is_privileged = true;
1373 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1374 protection_domain = thread->privileged_stack_top()->protection_domain();
1375 } else {
1376 protection_domain = method->method_holder()->protection_domain();
1377 }
1378
1379 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) {
1380 local_array->push(protection_domain);
1381 previous_protection_domain = protection_domain;
1382 }
1383
1384 if (is_privileged) break;
1385 }
1386
1387
1388 // either all the domains on the stack were system domains, or
1389 // we had a privileged system domain
1390 if (local_array->is_empty()) {
1391 if (is_privileged && privileged_context.is_null()) return NULL;
1392
1393 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1394 return JNIHandles::make_local(env, result);
1395 }
1396
1397 // the resource area must be registered in case of a gc
1398 RegisterArrayForGC ragc(thread, local_array);
1399 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1400 local_array->length(), CHECK_NULL);
1401 objArrayHandle h_context(thread, context);
1402 for (int index = 0; index < local_array->length(); index++) {
1403 h_context->obj_at_put(index, local_array->at(index));
1404 }
1405
1406 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1407
1408 return JNIHandles::make_local(env, result);
1409 JVM_END
1410
1411
1412 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1413 JVMWrapper("JVM_IsArrayClass");
1414 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1415 return (k != NULL) && k->is_array_klass() ? true : false;
1416 JVM_END
1417
1418
1419 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1420 JVMWrapper("JVM_IsPrimitiveClass");
1421 oop mirror = JNIHandles::resolve_non_null(cls);
1422 return (jboolean) java_lang_Class::is_primitive(mirror);
1423 JVM_END
1424
1425
1426 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1427 JVMWrapper("JVM_GetClassModifiers");
1428 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1429 // Primitive type
1430 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1431 }
1432
1433 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1434 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1435 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1436 return k->modifier_flags();
1437 JVM_END
1438
1439
1440 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1441
1442 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1443 JvmtiVMObjectAllocEventCollector oam;
1444 // ofClass is a reference to a java_lang_Class object. The mirror object
1445 // of an InstanceKlass
1446
1447 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1448 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1449 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1450 return (jobjectArray)JNIHandles::make_local(env, result);
1451 }
1452
1453 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1454 InnerClassesIterator iter(k);
1455
1456 if (iter.length() == 0) {
1457 // Neither an inner nor outer class
1458 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1459 return (jobjectArray)JNIHandles::make_local(env, result);
1460 }
1461
1462 // find inner class info
1463 constantPoolHandle cp(thread, k->constants());
1464 int length = iter.length();
1465
1466 // Allocate temp. result array
1467 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1468 objArrayHandle result (THREAD, r);
1469 int members = 0;
1470
1471 for (; !iter.done(); iter.next()) {
1472 int ioff = iter.inner_class_info_index();
1473 int ooff = iter.outer_class_info_index();
1474
1475 if (ioff != 0 && ooff != 0) {
1476 // Check to see if the name matches the class we're looking for
1477 // before attempting to find the class.
1478 if (cp->klass_name_at_matches(k, ooff)) {
1479 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1480 if (outer_klass == k) {
1481 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1482 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1483
1484 // Throws an exception if outer klass has not declared k as
1485 // an inner klass
1486 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1487
1488 result->obj_at_put(members, inner_klass->java_mirror());
1489 members++;
1490 }
1491 }
1492 }
1493 }
1494
1495 if (members != length) {
1496 // Return array of right length
1497 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1498 for(int i = 0; i < members; i++) {
1499 res->obj_at_put(i, result->obj_at(i));
1500 }
1501 return (jobjectArray)JNIHandles::make_local(env, res);
1502 }
1503
1504 return (jobjectArray)JNIHandles::make_local(env, result());
1505 JVM_END
1506
1507
1508 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1509 {
1510 // ofClass is a reference to a java_lang_Class object.
1511 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1512 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1513 return NULL;
1514 }
1515
1516 bool inner_is_member = false;
1517 Klass* outer_klass
1518 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1519 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1520 if (outer_klass == NULL) return NULL; // already a top-level class
1521 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1522 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1523 }
1524 JVM_END
1525
1526 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1527 {
1528 oop mirror = JNIHandles::resolve_non_null(cls);
1529 if (java_lang_Class::is_primitive(mirror) ||
1530 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1531 return NULL;
1532 }
1533 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1534 int ooff = 0, noff = 0;
1535 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1536 if (noff != 0) {
1537 constantPoolHandle i_cp(thread, k->constants());
1538 Symbol* name = i_cp->symbol_at(noff);
1539 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1540 return (jstring) JNIHandles::make_local(env, str());
1541 }
1542 }
1543 return NULL;
1544 }
1545 JVM_END
1546
1547 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1548 assert (cls != NULL, "illegal class");
1549 JVMWrapper("JVM_GetClassSignature");
1550 JvmtiVMObjectAllocEventCollector oam;
1551 ResourceMark rm(THREAD);
1552 // Return null for arrays and primatives
1553 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1554 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1555 if (k->is_instance_klass()) {
1556 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1557 if (sym == NULL) return NULL;
1558 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1559 return (jstring) JNIHandles::make_local(env, str());
1560 }
1561 }
1562 return NULL;
1563 JVM_END
1564
1565
1566 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1567 assert (cls != NULL, "illegal class");
1568 JVMWrapper("JVM_GetClassAnnotations");
1569
1570 // Return null for arrays and primitives
1571 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1572 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1573 if (k->is_instance_klass()) {
1574 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1575 return (jbyteArray) JNIHandles::make_local(env, a);
1576 }
1577 }
1578 return NULL;
1579 JVM_END
1580
1581
1582 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1583 // some of this code was adapted from from jni_FromReflectedField
1584
1585 oop reflected = JNIHandles::resolve_non_null(field);
1586 oop mirror = java_lang_reflect_Field::clazz(reflected);
1587 Klass* k = java_lang_Class::as_Klass(mirror);
1588 int slot = java_lang_reflect_Field::slot(reflected);
1589 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1590
1591 InstanceKlass* ik = InstanceKlass::cast(k);
1592 intptr_t offset = ik->field_offset(slot);
1593
1594 if (modifiers & JVM_ACC_STATIC) {
1595 // for static fields we only look in the current class
1596 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1597 assert(false, "cannot find static field");
1598 return false;
1599 }
1600 } else {
1601 // for instance fields we start with the current class and work
1602 // our way up through the superclass chain
1603 if (!ik->find_field_from_offset(offset, false, &fd)) {
1604 assert(false, "cannot find instance field");
1605 return false;
1606 }
1607 }
1608 return true;
1609 }
1610
1611 static Method* jvm_get_method_common(jobject method) {
1612 // some of this code was adapted from from jni_FromReflectedMethod
1613
1614 oop reflected = JNIHandles::resolve_non_null(method);
1615 oop mirror = NULL;
1616 int slot = 0;
1617
1618 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1619 mirror = java_lang_reflect_Constructor::clazz(reflected);
1620 slot = java_lang_reflect_Constructor::slot(reflected);
1621 } else {
1622 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1623 "wrong type");
1624 mirror = java_lang_reflect_Method::clazz(reflected);
1625 slot = java_lang_reflect_Method::slot(reflected);
1626 }
1627 Klass* k = java_lang_Class::as_Klass(mirror);
1628
1629 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1630 assert(m != NULL, "cannot find method");
1631 return m; // caller has to deal with NULL in product mode
1632 }
1633
1634 /* Type use annotations support (JDK 1.8) */
1635
1636 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1637 assert (cls != NULL, "illegal class");
1638 JVMWrapper("JVM_GetClassTypeAnnotations");
1639 ResourceMark rm(THREAD);
1640 // Return null for arrays and primitives
1641 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1642 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1643 if (k->is_instance_klass()) {
1644 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1645 if (type_annotations != NULL) {
1646 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1647 return (jbyteArray) JNIHandles::make_local(env, a);
1648 }
1649 }
1650 }
1651 return NULL;
1652 JVM_END
1653
1654 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1655 assert (method != NULL, "illegal method");
1656 JVMWrapper("JVM_GetMethodTypeAnnotations");
1657
1658 // method is a handle to a java.lang.reflect.Method object
1659 Method* m = jvm_get_method_common(method);
1660 if (m == NULL) {
1661 return NULL;
1662 }
1663
1664 AnnotationArray* type_annotations = m->type_annotations();
1665 if (type_annotations != NULL) {
1666 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1667 return (jbyteArray) JNIHandles::make_local(env, a);
1668 }
1669
1670 return NULL;
1671 JVM_END
1672
1673 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1674 assert (field != NULL, "illegal field");
1675 JVMWrapper("JVM_GetFieldTypeAnnotations");
1676
1677 fieldDescriptor fd;
1678 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1679 if (!gotFd) {
1680 return NULL;
1681 }
1682
1683 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1684 JVM_END
1685
1686 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1687 if (!cp->is_within_bounds(index)) {
1688 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1689 }
1690 }
1691
1692 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1693 {
1694 JVMWrapper("JVM_GetMethodParameters");
1695 // method is a handle to a java.lang.reflect.Method object
1696 Method* method_ptr = jvm_get_method_common(method);
1697 methodHandle mh (THREAD, method_ptr);
1698 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1699 const int num_params = mh->method_parameters_length();
1700
1701 if (num_params < 0) {
1702 // A -1 return value from method_parameters_length means there is no
1703 // parameter data. Return null to indicate this to the reflection
1704 // API.
1705 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1706 return (jobjectArray)NULL;
1707 } else {
1708 // Otherwise, we return something up to reflection, even if it is
1709 // a zero-length array. Why? Because in some cases this can
1710 // trigger a MalformedParametersException.
1711
1712 // make sure all the symbols are properly formatted
1713 for (int i = 0; i < num_params; i++) {
1714 MethodParametersElement* params = mh->method_parameters_start();
1715 int index = params[i].name_cp_index;
1716 bounds_check(mh->constants(), index, CHECK_NULL);
1717
1718 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1719 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1720 "Wrong type at constant pool index");
1721 }
1722
1723 }
1724
1725 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1726 objArrayHandle result (THREAD, result_oop);
1727
1728 for (int i = 0; i < num_params; i++) {
1729 MethodParametersElement* params = mh->method_parameters_start();
1730 // For a 0 index, give a NULL symbol
1731 Symbol* sym = 0 != params[i].name_cp_index ?
1732 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1733 int flags = params[i].flags;
1734 oop param = Reflection::new_parameter(reflected_method, i, sym,
1735 flags, CHECK_NULL);
1736 result->obj_at_put(i, param);
1737 }
1738 return (jobjectArray)JNIHandles::make_local(env, result());
1739 }
1740 }
1741 JVM_END
1742
1743 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1744
1745 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1746 {
1747 JVMWrapper("JVM_GetClassDeclaredFields");
1748 JvmtiVMObjectAllocEventCollector oam;
1749
1750 // Exclude primitive types and array types
1751 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1752 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1753 // Return empty array
1754 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1755 return (jobjectArray) JNIHandles::make_local(env, res);
1756 }
1757
1758 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1759 constantPoolHandle cp(THREAD, k->constants());
1760
1761 // Ensure class is linked
1762 k->link_class(CHECK_NULL);
1763
1764 // Allocate result
1765 int num_fields;
1766
1767 if (publicOnly) {
1768 num_fields = 0;
1769 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1770 if (fs.access_flags().is_public()) ++num_fields;
1771 }
1772 } else {
1773 num_fields = k->java_fields_count();
1774 }
1775
1776 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1777 objArrayHandle result (THREAD, r);
1778
1779 int out_idx = 0;
1780 fieldDescriptor fd;
1781 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1782 if (!publicOnly || fs.access_flags().is_public()) {
1783 fd.reinitialize(k, fs.index());
1784 oop field = Reflection::new_field(&fd, CHECK_NULL);
1785 result->obj_at_put(out_idx, field);
1786 ++out_idx;
1787 }
1788 }
1789 assert(out_idx == num_fields, "just checking");
1790 return (jobjectArray) JNIHandles::make_local(env, result());
1791 }
1792 JVM_END
1793
1794 static bool select_method(const methodHandle& method, bool want_constructor) {
1795 if (want_constructor) {
1796 return (method->is_initializer() && !method->is_static());
1797 } else {
1798 return (!method->is_initializer() && !method->is_overpass());
1799 }
1800 }
1801
1802 static jobjectArray get_class_declared_methods_helper(
1803 JNIEnv *env,
1804 jclass ofClass, jboolean publicOnly,
1805 bool want_constructor,
1806 Klass* klass, TRAPS) {
1807
1808 JvmtiVMObjectAllocEventCollector oam;
1809
1810 // Exclude primitive types and array types
1811 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1812 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1813 // Return empty array
1814 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1815 return (jobjectArray) JNIHandles::make_local(env, res);
1816 }
1817
1818 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1819
1820 // Ensure class is linked
1821 k->link_class(CHECK_NULL);
1822
1823 Array<Method*>* methods = k->methods();
1824 int methods_length = methods->length();
1825
1826 // Save original method_idnum in case of redefinition, which can change
1827 // the idnum of obsolete methods. The new method will have the same idnum
1828 // but if we refresh the methods array, the counts will be wrong.
1829 ResourceMark rm(THREAD);
1830 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1831 int num_methods = 0;
1832
1833 for (int i = 0; i < methods_length; i++) {
1834 methodHandle method(THREAD, methods->at(i));
1835 if (select_method(method, want_constructor)) {
1836 if (!publicOnly || method->is_public()) {
1837 idnums->push(method->method_idnum());
1838 ++num_methods;
1839 }
1840 }
1841 }
1842
1843 // Allocate result
1844 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1845 objArrayHandle result (THREAD, r);
1846
1847 // Now just put the methods that we selected above, but go by their idnum
1848 // in case of redefinition. The methods can be redefined at any safepoint,
1849 // so above when allocating the oop array and below when creating reflect
1850 // objects.
1851 for (int i = 0; i < num_methods; i++) {
1852 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1853 if (method.is_null()) {
1854 // Method may have been deleted and seems this API can handle null
1855 // Otherwise should probably put a method that throws NSME
1856 result->obj_at_put(i, NULL);
1857 } else {
1858 oop m;
1859 if (want_constructor) {
1860 m = Reflection::new_constructor(method, CHECK_NULL);
1861 } else {
1862 m = Reflection::new_method(method, false, CHECK_NULL);
1863 }
1864 result->obj_at_put(i, m);
1865 }
1866 }
1867
1868 return (jobjectArray) JNIHandles::make_local(env, result());
1869 }
1870
1871 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1872 {
1873 JVMWrapper("JVM_GetClassDeclaredMethods");
1874 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1875 /*want_constructor*/ false,
1876 SystemDictionary::reflect_Method_klass(), THREAD);
1877 }
1878 JVM_END
1879
1880 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1881 {
1882 JVMWrapper("JVM_GetClassDeclaredConstructors");
1883 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1884 /*want_constructor*/ true,
1885 SystemDictionary::reflect_Constructor_klass(), THREAD);
1886 }
1887 JVM_END
1888
1889 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1890 {
1891 JVMWrapper("JVM_GetClassAccessFlags");
1892 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1893 // Primitive type
1894 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1895 }
1896
1897 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1898 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1899 }
1900 JVM_END
1901
1902
1903 // Constant pool access //////////////////////////////////////////////////////////
1904
1905 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1906 {
1907 JVMWrapper("JVM_GetClassConstantPool");
1908 JvmtiVMObjectAllocEventCollector oam;
1909
1910 // Return null for primitives and arrays
1911 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1912 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1913 if (k->is_instance_klass()) {
1914 InstanceKlass* k_h = InstanceKlass::cast(k);
1915 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1916 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1917 return JNIHandles::make_local(jcp());
1918 }
1919 }
1920 return NULL;
1921 }
1922 JVM_END
1923
1924
1925 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1926 {
1927 JVMWrapper("JVM_ConstantPoolGetSize");
1928 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1929 return cp->length();
1930 }
1931 JVM_END
1932
1933
1934 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1935 {
1936 JVMWrapper("JVM_ConstantPoolGetClassAt");
1937 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1938 bounds_check(cp, index, CHECK_NULL);
1939 constantTag tag = cp->tag_at(index);
1940 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1941 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1942 }
1943 Klass* k = cp->klass_at(index, CHECK_NULL);
1944 return (jclass) JNIHandles::make_local(k->java_mirror());
1945 }
1946 JVM_END
1947
1948 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1949 {
1950 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1951 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1952 bounds_check(cp, index, CHECK_NULL);
1953 constantTag tag = cp->tag_at(index);
1954 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1955 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1956 }
1957 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1958 if (k == NULL) return NULL;
1959 return (jclass) JNIHandles::make_local(k->java_mirror());
1960 }
1961 JVM_END
1962
1963 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1964 constantTag tag = cp->tag_at(index);
1965 if (!tag.is_method() && !tag.is_interface_method()) {
1966 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1967 }
1968 int klass_ref = cp->uncached_klass_ref_index_at(index);
1969 Klass* k_o;
1970 if (force_resolution) {
1971 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1972 } else {
1973 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1974 if (k_o == NULL) return NULL;
1975 }
1976 InstanceKlass* k = InstanceKlass::cast(k_o);
1977 Symbol* name = cp->uncached_name_ref_at(index);
1978 Symbol* sig = cp->uncached_signature_ref_at(index);
1979 methodHandle m (THREAD, k->find_method(name, sig));
1980 if (m.is_null()) {
1981 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1982 }
1983 oop method;
1984 if (!m->is_initializer() || m->is_static()) {
1985 method = Reflection::new_method(m, true, CHECK_NULL);
1986 } else {
1987 method = Reflection::new_constructor(m, CHECK_NULL);
1988 }
1989 return JNIHandles::make_local(method);
1990 }
1991
1992 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1993 {
1994 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1995 JvmtiVMObjectAllocEventCollector oam;
1996 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1997 bounds_check(cp, index, CHECK_NULL);
1998 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1999 return res;
2000 }
2001 JVM_END
2002
2003 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2004 {
2005 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2006 JvmtiVMObjectAllocEventCollector oam;
2007 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2008 bounds_check(cp, index, CHECK_NULL);
2009 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2010 return res;
2011 }
2012 JVM_END
2013
2014 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2015 constantTag tag = cp->tag_at(index);
2016 if (!tag.is_field()) {
2017 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2018 }
2019 int klass_ref = cp->uncached_klass_ref_index_at(index);
2020 Klass* k_o;
2021 if (force_resolution) {
2022 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2023 } else {
2024 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2025 if (k_o == NULL) return NULL;
2026 }
2027 InstanceKlass* k = InstanceKlass::cast(k_o);
2028 Symbol* name = cp->uncached_name_ref_at(index);
2029 Symbol* sig = cp->uncached_signature_ref_at(index);
2030 fieldDescriptor fd;
2031 Klass* target_klass = k->find_field(name, sig, &fd);
2032 if (target_klass == NULL) {
2033 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2034 }
2035 oop field = Reflection::new_field(&fd, CHECK_NULL);
2036 return JNIHandles::make_local(field);
2037 }
2038
2039 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2040 {
2041 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2042 JvmtiVMObjectAllocEventCollector oam;
2043 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2044 bounds_check(cp, index, CHECK_NULL);
2045 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2046 return res;
2047 }
2048 JVM_END
2049
2050 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2051 {
2052 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2053 JvmtiVMObjectAllocEventCollector oam;
2054 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2055 bounds_check(cp, index, CHECK_NULL);
2056 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2057 return res;
2058 }
2059 JVM_END
2060
2061 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2062 {
2063 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2064 JvmtiVMObjectAllocEventCollector oam;
2065 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2066 bounds_check(cp, index, CHECK_NULL);
2067 constantTag tag = cp->tag_at(index);
2068 if (!tag.is_field_or_method()) {
2069 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2070 }
2071 int klass_ref = cp->uncached_klass_ref_index_at(index);
2072 Symbol* klass_name = cp->klass_name_at(klass_ref);
2073 Symbol* member_name = cp->uncached_name_ref_at(index);
2074 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2075 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2076 objArrayHandle dest(THREAD, dest_o);
2077 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2078 dest->obj_at_put(0, str());
2079 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2080 dest->obj_at_put(1, str());
2081 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2082 dest->obj_at_put(2, str());
2083 return (jobjectArray) JNIHandles::make_local(dest());
2084 }
2085 JVM_END
2086
2087 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2088 {
2089 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2090 JvmtiVMObjectAllocEventCollector oam;
2091 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2092 bounds_check(cp, index, CHECK_0);
2093 constantTag tag = cp->tag_at(index);
2094 if (!tag.is_field_or_method()) {
2095 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2096 }
2097 return (jint) cp->uncached_klass_ref_index_at(index);
2098 }
2099 JVM_END
2100
2101 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2102 {
2103 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2104 JvmtiVMObjectAllocEventCollector oam;
2105 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2106 bounds_check(cp, index, CHECK_0);
2107 constantTag tag = cp->tag_at(index);
2108 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2109 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2110 }
2111 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2112 }
2113 JVM_END
2114
2115 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2116 {
2117 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2118 JvmtiVMObjectAllocEventCollector oam;
2119 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2120 bounds_check(cp, index, CHECK_NULL);
2121 constantTag tag = cp->tag_at(index);
2122 if (!tag.is_name_and_type()) {
2123 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2124 }
2125 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2126 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2127 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2128 objArrayHandle dest(THREAD, dest_o);
2129 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2130 dest->obj_at_put(0, str());
2131 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2132 dest->obj_at_put(1, str());
2133 return (jobjectArray) JNIHandles::make_local(dest());
2134 }
2135 JVM_END
2136
2137 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2138 {
2139 JVMWrapper("JVM_ConstantPoolGetIntAt");
2140 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2141 bounds_check(cp, index, CHECK_0);
2142 constantTag tag = cp->tag_at(index);
2143 if (!tag.is_int()) {
2144 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2145 }
2146 return cp->int_at(index);
2147 }
2148 JVM_END
2149
2150 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2151 {
2152 JVMWrapper("JVM_ConstantPoolGetLongAt");
2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2154 bounds_check(cp, index, CHECK_(0L));
2155 constantTag tag = cp->tag_at(index);
2156 if (!tag.is_long()) {
2157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2158 }
2159 return cp->long_at(index);
2160 }
2161 JVM_END
2162
2163 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2164 {
2165 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2166 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2167 bounds_check(cp, index, CHECK_(0.0f));
2168 constantTag tag = cp->tag_at(index);
2169 if (!tag.is_float()) {
2170 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2171 }
2172 return cp->float_at(index);
2173 }
2174 JVM_END
2175
2176 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2177 {
2178 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2179 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2180 bounds_check(cp, index, CHECK_(0.0));
2181 constantTag tag = cp->tag_at(index);
2182 if (!tag.is_double()) {
2183 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2184 }
2185 return cp->double_at(index);
2186 }
2187 JVM_END
2188
2189 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2190 {
2191 JVMWrapper("JVM_ConstantPoolGetStringAt");
2192 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2193 bounds_check(cp, index, CHECK_NULL);
2194 constantTag tag = cp->tag_at(index);
2195 if (!tag.is_string()) {
2196 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2197 }
2198 oop str = cp->string_at(index, CHECK_NULL);
2199 return (jstring) JNIHandles::make_local(str);
2200 }
2201 JVM_END
2202
2203 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2204 {
2205 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2206 JvmtiVMObjectAllocEventCollector oam;
2207 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2208 bounds_check(cp, index, CHECK_NULL);
2209 constantTag tag = cp->tag_at(index);
2210 if (!tag.is_symbol()) {
2211 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2212 }
2213 Symbol* sym = cp->symbol_at(index);
2214 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2215 return (jstring) JNIHandles::make_local(str());
2216 }
2217 JVM_END
2218
2219 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2220 {
2221 JVMWrapper("JVM_ConstantPoolGetTagAt");
2222 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2223 bounds_check(cp, index, CHECK_0);
2224 constantTag tag = cp->tag_at(index);
2225 jbyte result = tag.value();
2226 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2227 // they are changed to the corresponding tags from the JVM spec, so that java code in
2228 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2229 if (tag.is_klass_or_reference()) {
2230 result = JVM_CONSTANT_Class;
2231 } else if (tag.is_string_index()) {
2232 result = JVM_CONSTANT_String;
2233 } else if (tag.is_method_type_in_error()) {
2234 result = JVM_CONSTANT_MethodType;
2235 } else if (tag.is_method_handle_in_error()) {
2236 result = JVM_CONSTANT_MethodHandle;
2237 } else if (tag.is_dynamic_constant_in_error()) {
2238 result = JVM_CONSTANT_Dynamic;
2239 }
2240 return result;
2241 }
2242 JVM_END
2243
2244 // Assertion support. //////////////////////////////////////////////////////////
2245
2246 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2247 JVMWrapper("JVM_DesiredAssertionStatus");
2248 assert(cls != NULL, "bad class");
2249
2250 oop r = JNIHandles::resolve(cls);
2251 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2252 if (java_lang_Class::is_primitive(r)) return false;
2253
2254 Klass* k = java_lang_Class::as_Klass(r);
2255 assert(k->is_instance_klass(), "must be an instance klass");
2256 if (!k->is_instance_klass()) return false;
2257
2258 ResourceMark rm(THREAD);
2259 const char* name = k->name()->as_C_string();
2260 bool system_class = k->class_loader() == NULL;
2261 return JavaAssertions::enabled(name, system_class);
2262
2263 JVM_END
2264
2265
2266 // Return a new AssertionStatusDirectives object with the fields filled in with
2267 // command-line assertion arguments (i.e., -ea, -da).
2268 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2269 JVMWrapper("JVM_AssertionStatusDirectives");
2270 JvmtiVMObjectAllocEventCollector oam;
2271 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2272 return JNIHandles::make_local(env, asd);
2273 JVM_END
2274
2275 // Verification ////////////////////////////////////////////////////////////////////////////////
2276
2277 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2278
2279 // RedefineClasses support: bug 6214132 caused verification to fail.
2280 // All functions from this section should call the jvmtiThreadSate function:
2281 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2282 // The function returns a Klass* of the _scratch_class if the verifier
2283 // was invoked in the middle of the class redefinition.
2284 // Otherwise it returns its argument value which is the _the_class Klass*.
2285 // Please, refer to the description in the jvmtiThreadSate.hpp.
2286
2287 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2288 JVMWrapper("JVM_GetClassNameUTF");
2289 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2290 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2291 return k->name()->as_utf8();
2292 JVM_END
2293
2294
2295 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2296 JVMWrapper("JVM_GetClassCPTypes");
2297 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2298 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2299 // types will have length zero if this is not an InstanceKlass
2300 // (length is determined by call to JVM_GetClassCPEntriesCount)
2301 if (k->is_instance_klass()) {
2302 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2303 for (int index = cp->length() - 1; index >= 0; index--) {
2304 constantTag tag = cp->tag_at(index);
2305 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2306 }
2307 }
2308 JVM_END
2309
2310
2311 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2312 JVMWrapper("JVM_GetClassCPEntriesCount");
2313 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2314 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2315 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2316 JVM_END
2317
2318
2319 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2320 JVMWrapper("JVM_GetClassFieldsCount");
2321 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2322 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2323 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2324 JVM_END
2325
2326
2327 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2328 JVMWrapper("JVM_GetClassMethodsCount");
2329 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2330 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2331 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2332 JVM_END
2333
2334
2335 // The following methods, used for the verifier, are never called with
2336 // array klasses, so a direct cast to InstanceKlass is safe.
2337 // Typically, these methods are called in a loop with bounds determined
2338 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2339 // zero for arrays.
2340 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2341 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2342 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2343 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2344 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2345 int length = method->checked_exceptions_length();
2346 if (length > 0) {
2347 CheckedExceptionElement* table= method->checked_exceptions_start();
2348 for (int i = 0; i < length; i++) {
2349 exceptions[i] = table[i].class_cp_index;
2350 }
2351 }
2352 JVM_END
2353
2354
2355 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2356 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2357 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2358 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2359 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2360 return method->checked_exceptions_length();
2361 JVM_END
2362
2363
2364 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2365 JVMWrapper("JVM_GetMethodIxByteCode");
2366 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2367 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2368 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2369 memcpy(code, method->code_base(), method->code_size());
2370 JVM_END
2371
2372
2373 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2374 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2375 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2376 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2377 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2378 return method->code_size();
2379 JVM_END
2380
2381
2382 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2383 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2384 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2385 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2386 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2387 ExceptionTable extable(method);
2388 entry->start_pc = extable.start_pc(entry_index);
2389 entry->end_pc = extable.end_pc(entry_index);
2390 entry->handler_pc = extable.handler_pc(entry_index);
2391 entry->catchType = extable.catch_type_index(entry_index);
2392 JVM_END
2393
2394
2395 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2396 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2397 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2398 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2399 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2400 return method->exception_table_length();
2401 JVM_END
2402
2403
2404 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2405 JVMWrapper("JVM_GetMethodIxModifiers");
2406 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2407 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2408 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2409 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2410 JVM_END
2411
2412
2413 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2414 JVMWrapper("JVM_GetFieldIxModifiers");
2415 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2416 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2417 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2418 JVM_END
2419
2420
2421 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2422 JVMWrapper("JVM_GetMethodIxLocalsCount");
2423 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2424 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2425 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2426 return method->max_locals();
2427 JVM_END
2428
2429
2430 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2431 JVMWrapper("JVM_GetMethodIxArgsSize");
2432 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2433 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2434 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2435 return method->size_of_parameters();
2436 JVM_END
2437
2438
2439 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2440 JVMWrapper("JVM_GetMethodIxMaxStack");
2441 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2442 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2443 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2444 return method->verifier_max_stack();
2445 JVM_END
2446
2447
2448 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2449 JVMWrapper("JVM_IsConstructorIx");
2450 ResourceMark rm(THREAD);
2451 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2452 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2453 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2454 return method->name() == vmSymbols::object_initializer_name();
2455 JVM_END
2456
2457
2458 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2459 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2460 ResourceMark rm(THREAD);
2461 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2462 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2463 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2464 return method->is_overpass();
2465 JVM_END
2466
2467 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2468 JVMWrapper("JVM_GetMethodIxIxUTF");
2469 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2470 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2471 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2472 return method->name()->as_utf8();
2473 JVM_END
2474
2475
2476 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2477 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2478 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2479 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2480 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2481 return method->signature()->as_utf8();
2482 JVM_END
2483
2484 /**
2485 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2486 * read entries in the constant pool. Since the old verifier always
2487 * works on a copy of the code, it will not see any rewriting that
2488 * may possibly occur in the middle of verification. So it is important
2489 * that nothing it calls tries to use the cpCache instead of the raw
2490 * constant pool, so we must use cp->uncached_x methods when appropriate.
2491 */
2492 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2493 JVMWrapper("JVM_GetCPFieldNameUTF");
2494 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2495 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2496 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2497 switch (cp->tag_at(cp_index).value()) {
2498 case JVM_CONSTANT_Fieldref:
2499 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2500 default:
2501 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2502 }
2503 ShouldNotReachHere();
2504 return NULL;
2505 JVM_END
2506
2507
2508 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2509 JVMWrapper("JVM_GetCPMethodNameUTF");
2510 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2511 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2512 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2513 switch (cp->tag_at(cp_index).value()) {
2514 case JVM_CONSTANT_InterfaceMethodref:
2515 case JVM_CONSTANT_Methodref:
2516 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2517 default:
2518 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2519 }
2520 ShouldNotReachHere();
2521 return NULL;
2522 JVM_END
2523
2524
2525 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2526 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2527 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2528 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2529 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2530 switch (cp->tag_at(cp_index).value()) {
2531 case JVM_CONSTANT_InterfaceMethodref:
2532 case JVM_CONSTANT_Methodref:
2533 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2534 default:
2535 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2536 }
2537 ShouldNotReachHere();
2538 return NULL;
2539 JVM_END
2540
2541
2542 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2543 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2544 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2545 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2546 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2547 switch (cp->tag_at(cp_index).value()) {
2548 case JVM_CONSTANT_Fieldref:
2549 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2550 default:
2551 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2552 }
2553 ShouldNotReachHere();
2554 return NULL;
2555 JVM_END
2556
2557
2558 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2559 JVMWrapper("JVM_GetCPClassNameUTF");
2560 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2561 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2562 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2563 Symbol* classname = cp->klass_name_at(cp_index);
2564 return classname->as_utf8();
2565 JVM_END
2566
2567
2568 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2569 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2570 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2571 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2572 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2573 switch (cp->tag_at(cp_index).value()) {
2574 case JVM_CONSTANT_Fieldref: {
2575 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2576 Symbol* classname = cp->klass_name_at(class_index);
2577 return classname->as_utf8();
2578 }
2579 default:
2580 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2581 }
2582 ShouldNotReachHere();
2583 return NULL;
2584 JVM_END
2585
2586
2587 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2588 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2589 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2590 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2591 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2592 switch (cp->tag_at(cp_index).value()) {
2593 case JVM_CONSTANT_Methodref:
2594 case JVM_CONSTANT_InterfaceMethodref: {
2595 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2596 Symbol* classname = cp->klass_name_at(class_index);
2597 return classname->as_utf8();
2598 }
2599 default:
2600 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2601 }
2602 ShouldNotReachHere();
2603 return NULL;
2604 JVM_END
2605
2606
2607 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2608 JVMWrapper("JVM_GetCPFieldModifiers");
2609 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2610 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2611 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2612 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2613 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2614 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2615 switch (cp->tag_at(cp_index).value()) {
2616 case JVM_CONSTANT_Fieldref: {
2617 Symbol* name = cp->uncached_name_ref_at(cp_index);
2618 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2619 InstanceKlass* ik = InstanceKlass::cast(k_called);
2620 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2621 if (fs.name() == name && fs.signature() == signature) {
2622 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2623 }
2624 }
2625 return -1;
2626 }
2627 default:
2628 fatal("JVM_GetCPFieldModifiers: illegal constant");
2629 }
2630 ShouldNotReachHere();
2631 return 0;
2632 JVM_END
2633
2634
2635 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2636 JVMWrapper("JVM_GetCPMethodModifiers");
2637 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2638 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2639 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2640 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2641 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2642 switch (cp->tag_at(cp_index).value()) {
2643 case JVM_CONSTANT_Methodref:
2644 case JVM_CONSTANT_InterfaceMethodref: {
2645 Symbol* name = cp->uncached_name_ref_at(cp_index);
2646 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2647 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2648 int methods_count = methods->length();
2649 for (int i = 0; i < methods_count; i++) {
2650 Method* method = methods->at(i);
2651 if (method->name() == name && method->signature() == signature) {
2652 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2653 }
2654 }
2655 return -1;
2656 }
2657 default:
2658 fatal("JVM_GetCPMethodModifiers: illegal constant");
2659 }
2660 ShouldNotReachHere();
2661 return 0;
2662 JVM_END
2663
2664
2665 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2666
2667 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2668 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2669 JVM_END
2670
2671
2672 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2673 JVMWrapper("JVM_IsSameClassPackage");
2674 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2675 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2676 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2677 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2678 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2679 JVM_END
2680
2681 // Printing support //////////////////////////////////////////////////
2682 extern "C" {
2683
2684 ATTRIBUTE_PRINTF(3, 0)
2685 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2686 // Reject count values that are negative signed values converted to
2687 // unsigned; see bug 4399518, 4417214
2688 if ((intptr_t)count <= 0) return -1;
2689
2690 int result = os::vsnprintf(str, count, fmt, args);
2691 if (result > 0 && (size_t)result >= count) {
2692 result = -1;
2693 }
2694
2695 return result;
2696 }
2697
2698 ATTRIBUTE_PRINTF(3, 4)
2699 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2700 va_list args;
2701 int len;
2702 va_start(args, fmt);
2703 len = jio_vsnprintf(str, count, fmt, args);
2704 va_end(args);
2705 return len;
2706 }
2707
2708 ATTRIBUTE_PRINTF(2, 3)
2709 int jio_fprintf(FILE* f, const char *fmt, ...) {
2710 int len;
2711 va_list args;
2712 va_start(args, fmt);
2713 len = jio_vfprintf(f, fmt, args);
2714 va_end(args);
2715 return len;
2716 }
2717
2718 ATTRIBUTE_PRINTF(2, 0)
2719 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2720 if (Arguments::vfprintf_hook() != NULL) {
2721 return Arguments::vfprintf_hook()(f, fmt, args);
2722 } else {
2723 return vfprintf(f, fmt, args);
2724 }
2725 }
2726
2727 ATTRIBUTE_PRINTF(1, 2)
2728 JNIEXPORT int jio_printf(const char *fmt, ...) {
2729 int len;
2730 va_list args;
2731 va_start(args, fmt);
2732 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2733 va_end(args);
2734 return len;
2735 }
2736
2737 // HotSpot specific jio method
2738 void jio_print(const char* s, size_t len) {
2739 // Try to make this function as atomic as possible.
2740 if (Arguments::vfprintf_hook() != NULL) {
2741 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2742 } else {
2743 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2744 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2745 }
2746 }
2747
2748 } // Extern C
2749
2750 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2751
2752 // In most of the JVM thread support functions we need to access the
2753 // thread through a ThreadsListHandle to prevent it from exiting and
2754 // being reclaimed while we try to operate on it. The exceptions to this
2755 // rule are when operating on the current thread, or if the monitor of
2756 // the target java.lang.Thread is locked at the Java level - in both
2757 // cases the target cannot exit.
2758
2759 static void thread_entry(JavaThread* thread, TRAPS) {
2760 HandleMark hm(THREAD);
2761 Handle obj(THREAD, thread->threadObj());
2762 JavaValue result(T_VOID);
2763 JavaCalls::call_virtual(&result,
2764 obj,
2765 SystemDictionary::Thread_klass(),
2766 vmSymbols::run_method_name(),
2767 vmSymbols::void_method_signature(),
2768 THREAD);
2769 }
2770
2771
2772 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2773 JVMWrapper("JVM_StartThread");
2774 JavaThread *native_thread = NULL;
2775
2776 // We cannot hold the Threads_lock when we throw an exception,
2777 // due to rank ordering issues. Example: we might need to grab the
2778 // Heap_lock while we construct the exception.
2779 bool throw_illegal_thread_state = false;
2780
2781 // We must release the Threads_lock before we can post a jvmti event
2782 // in Thread::start.
2783 {
2784 // Ensure that the C++ Thread and OSThread structures aren't freed before
2785 // we operate.
2786 MutexLocker mu(Threads_lock);
2787
2788 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2789 // re-starting an already started thread, so we should usually find
2790 // that the JavaThread is null. However for a JNI attached thread
2791 // there is a small window between the Thread object being created
2792 // (with its JavaThread set) and the update to its threadStatus, so we
2793 // have to check for this
2794 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2795 throw_illegal_thread_state = true;
2796 } else {
2797 // We could also check the stillborn flag to see if this thread was already stopped, but
2798 // for historical reasons we let the thread detect that itself when it starts running
2799
2800 jlong size =
2801 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2802 // Allocate the C++ Thread structure and create the native thread. The
2803 // stack size retrieved from java is 64-bit signed, but the constructor takes
2804 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2805 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2806 // - Avoid passing negative values which would result in really large stacks.
2807 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2808 size_t sz = size > 0 ? (size_t) size : 0;
2809 native_thread = new JavaThread(&thread_entry, sz);
2810
2811 // At this point it may be possible that no osthread was created for the
2812 // JavaThread due to lack of memory. Check for this situation and throw
2813 // an exception if necessary. Eventually we may want to change this so
2814 // that we only grab the lock if the thread was created successfully -
2815 // then we can also do this check and throw the exception in the
2816 // JavaThread constructor.
2817 if (native_thread->osthread() != NULL) {
2818 // Note: the current thread is not being used within "prepare".
2819 native_thread->prepare(jthread);
2820 }
2821 }
2822 }
2823
2824 if (throw_illegal_thread_state) {
2825 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2826 }
2827
2828 assert(native_thread != NULL, "Starting null thread?");
2829
2830 if (native_thread->osthread() == NULL) {
2831 // No one should hold a reference to the 'native_thread'.
2832 native_thread->smr_delete();
2833 if (JvmtiExport::should_post_resource_exhausted()) {
2834 JvmtiExport::post_resource_exhausted(
2835 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2836 os::native_thread_creation_failed_msg());
2837 }
2838 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2839 os::native_thread_creation_failed_msg());
2840 }
2841
2842 Thread::start(native_thread);
2843
2844 JVM_END
2845
2846
2847 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2848 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2849 // but is thought to be reliable and simple. In the case, where the receiver is the
2850 // same thread as the sender, no VM_Operation is needed.
2851 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2852 JVMWrapper("JVM_StopThread");
2853
2854 // A nested ThreadsListHandle will grab the Threads_lock so create
2855 // tlh before we resolve throwable.
2856 ThreadsListHandle tlh(thread);
2857 oop java_throwable = JNIHandles::resolve(throwable);
2858 if (java_throwable == NULL) {
2859 THROW(vmSymbols::java_lang_NullPointerException());
2860 }
2861 oop java_thread = NULL;
2862 JavaThread* receiver = NULL;
2863 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2864 Events::log_exception(thread,
2865 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2866 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2867
2868 if (is_alive) {
2869 // jthread refers to a live JavaThread.
2870 if (thread == receiver) {
2871 // Exception is getting thrown at self so no VM_Operation needed.
2872 THROW_OOP(java_throwable);
2873 } else {
2874 // Use a VM_Operation to throw the exception.
2875 Thread::send_async_exception(java_thread, java_throwable);
2876 }
2877 } else {
2878 // Either:
2879 // - target thread has not been started before being stopped, or
2880 // - target thread already terminated
2881 // We could read the threadStatus to determine which case it is
2882 // but that is overkill as it doesn't matter. We must set the
2883 // stillborn flag for the first case, and if the thread has already
2884 // exited setting this flag has no effect.
2885 java_lang_Thread::set_stillborn(java_thread);
2886 }
2887 JVM_END
2888
2889
2890 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2891 JVMWrapper("JVM_IsThreadAlive");
2892
2893 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2894 return java_lang_Thread::is_alive(thread_oop);
2895 JVM_END
2896
2897
2898 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2899 JVMWrapper("JVM_SuspendThread");
2900
2901 ThreadsListHandle tlh(thread);
2902 JavaThread* receiver = NULL;
2903 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2904 if (is_alive) {
2905 // jthread refers to a live JavaThread.
2906 {
2907 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2908 if (receiver->is_external_suspend()) {
2909 // Don't allow nested external suspend requests. We can't return
2910 // an error from this interface so just ignore the problem.
2911 return;
2912 }
2913 if (receiver->is_exiting()) { // thread is in the process of exiting
2914 return;
2915 }
2916 receiver->set_external_suspend();
2917 }
2918
2919 // java_suspend() will catch threads in the process of exiting
2920 // and will ignore them.
2921 receiver->java_suspend();
2922
2923 // It would be nice to have the following assertion in all the
2924 // time, but it is possible for a racing resume request to have
2925 // resumed this thread right after we suspended it. Temporarily
2926 // enable this assertion if you are chasing a different kind of
2927 // bug.
2928 //
2929 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2930 // receiver->is_being_ext_suspended(), "thread is not suspended");
2931 }
2932 JVM_END
2933
2934
2935 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2936 JVMWrapper("JVM_ResumeThread");
2937
2938 ThreadsListHandle tlh(thread);
2939 JavaThread* receiver = NULL;
2940 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2941 if (is_alive) {
2942 // jthread refers to a live JavaThread.
2943
2944 // This is the original comment for this Threads_lock grab:
2945 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2946 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2947 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2948 // looks at it.
2949 //
2950 // The above comment dates back to when we had both internal and
2951 // external suspend APIs that shared a common underlying mechanism.
2952 // External suspend is now entirely cooperative and doesn't share
2953 // anything with internal suspend. That said, there are some
2954 // assumptions in the VM that an external resume grabs the
2955 // Threads_lock. We can't drop the Threads_lock grab here until we
2956 // resolve the assumptions that exist elsewhere.
2957 //
2958 MutexLocker ml(Threads_lock);
2959 receiver->java_resume();
2960 }
2961 JVM_END
2962
2963
2964 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2965 JVMWrapper("JVM_SetThreadPriority");
2966
2967 ThreadsListHandle tlh(thread);
2968 oop java_thread = NULL;
2969 JavaThread* receiver = NULL;
2970 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2971 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2972
2973 if (is_alive) {
2974 // jthread refers to a live JavaThread.
2975 Thread::set_priority(receiver, (ThreadPriority)prio);
2976 }
2977 // Implied else: If the JavaThread hasn't started yet, then the
2978 // priority set in the java.lang.Thread object above will be pushed
2979 // down when it does start.
2980 JVM_END
2981
2982
2983 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2984 JVMWrapper("JVM_Yield");
2985 if (os::dont_yield()) return;
2986 HOTSPOT_THREAD_YIELD();
2987 os::naked_yield();
2988 JVM_END
2989
2990 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
2991 assert(event != NULL, "invariant");
2992 assert(event->should_commit(), "invariant");
2993 event->set_time(millis);
2994 event->commit();
2995 }
2996
2997 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2998 JVMWrapper("JVM_Sleep");
2999
3000 if (millis < 0) {
3001 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3002 }
3003
3004 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3005 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3006 }
3007
3008 // Save current thread state and restore it at the end of this block.
3009 // And set new thread state to SLEEPING.
3010 JavaThreadSleepState jtss(thread);
3011
3012 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3013 EventThreadSleep event;
3014
3015 if (millis == 0) {
3016 os::naked_yield();
3017 } else {
3018 ThreadState old_state = thread->osthread()->get_state();
3019 thread->osthread()->set_state(SLEEPING);
3020 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3021 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3022 // us while we were sleeping. We do not overwrite those.
3023 if (!HAS_PENDING_EXCEPTION) {
3024 if (event.should_commit()) {
3025 post_thread_sleep_event(&event, millis);
3026 }
3027 HOTSPOT_THREAD_SLEEP_END(1);
3028
3029 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3030 // to properly restore the thread state. That's likely wrong.
3031 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3032 }
3033 }
3034 thread->osthread()->set_state(old_state);
3035 }
3036 if (event.should_commit()) {
3037 post_thread_sleep_event(&event, millis);
3038 }
3039 HOTSPOT_THREAD_SLEEP_END(0);
3040 JVM_END
3041
3042 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3043 JVMWrapper("JVM_CurrentThread");
3044 oop jthread = thread->threadObj();
3045 assert (thread != NULL, "no current thread!");
3046 return JNIHandles::make_local(env, jthread);
3047 JVM_END
3048
3049
3050 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3051 JVMWrapper("JVM_CountStackFrames");
3052
3053 uint32_t debug_bits = 0;
3054 ThreadsListHandle tlh(thread);
3055 JavaThread* receiver = NULL;
3056 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3057 int count = 0;
3058 if (is_alive) {
3059 // jthread refers to a live JavaThread.
3060 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
3061 // Count all java activation, i.e., number of vframes.
3062 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) {
3063 // Native frames are not counted.
3064 if (!vfst.method()->is_native()) count++;
3065 }
3066 } else {
3067 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3068 "this thread is not suspended");
3069 }
3070 }
3071 // Implied else: if JavaThread is not alive simply return a count of 0.
3072
3073 return count;
3074 JVM_END
3075
3076
3077 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3078 JVMWrapper("JVM_Interrupt");
3079
3080 ThreadsListHandle tlh(thread);
3081 JavaThread* receiver = NULL;
3082 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3083 if (is_alive) {
3084 // jthread refers to a live JavaThread.
3085 Thread::interrupt(receiver);
3086 }
3087 JVM_END
3088
3089
3090 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3091 JVMWrapper("JVM_IsInterrupted");
3092
3093 ThreadsListHandle tlh(thread);
3094 JavaThread* receiver = NULL;
3095 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3096 if (is_alive) {
3097 // jthread refers to a live JavaThread.
3098 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3099 } else {
3100 return JNI_FALSE;
3101 }
3102 JVM_END
3103
3104
3105 // Return true iff the current thread has locked the object passed in
3106
3107 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3108 JVMWrapper("JVM_HoldsLock");
3109 assert(THREAD->is_Java_thread(), "sanity check");
3110 if (obj == NULL) {
3111 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3112 }
3113 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3114 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3115 JVM_END
3116
3117
3118 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3119 JVMWrapper("JVM_DumpAllStacks");
3120 VM_PrintThreads op;
3121 VMThread::execute(&op);
3122 if (JvmtiExport::should_post_data_dump()) {
3123 JvmtiExport::post_data_dump();
3124 }
3125 JVM_END
3126
3127 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3128 JVMWrapper("JVM_SetNativeThreadName");
3129
3130 // We don't use a ThreadsListHandle here because the current thread
3131 // must be alive.
3132 oop java_thread = JNIHandles::resolve_non_null(jthread);
3133 JavaThread* thr = java_lang_Thread::thread(java_thread);
3134 if (thread == thr && !thr->has_attached_via_jni()) {
3135 // Thread naming is only supported for the current thread and
3136 // we don't set the name of an attached thread to avoid stepping
3137 // on other programs.
3138 ResourceMark rm(thread);
3139 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3140 os::set_native_thread_name(thread_name);
3141 }
3142 JVM_END
3143
3144 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3145
3146 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3147 JVMWrapper("JVM_GetClassContext");
3148 ResourceMark rm(THREAD);
3149 JvmtiVMObjectAllocEventCollector oam;
3150 vframeStream vfst(thread);
3151
3152 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3153 // This must only be called from SecurityManager.getClassContext
3154 Method* m = vfst.method();
3155 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3156 m->name() == vmSymbols::getClassContext_name() &&
3157 m->signature() == vmSymbols::void_class_array_signature())) {
3158 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3159 }
3160 }
3161
3162 // Collect method holders
3163 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3164 for (; !vfst.at_end(); vfst.security_next()) {
3165 Method* m = vfst.method();
3166 // Native frames are not returned
3167 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3168 Klass* holder = m->method_holder();
3169 assert(holder->is_klass(), "just checking");
3170 klass_array->append(holder);
3171 }
3172 }
3173
3174 // Create result array of type [Ljava/lang/Class;
3175 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3176 // Fill in mirrors corresponding to method holders
3177 for (int i = 0; i < klass_array->length(); i++) {
3178 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3179 }
3180
3181 return (jobjectArray) JNIHandles::make_local(env, result);
3182 JVM_END
3183
3184
3185 // java.lang.Package ////////////////////////////////////////////////////////////////
3186
3187
3188 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3189 JVMWrapper("JVM_GetSystemPackage");
3190 ResourceMark rm(THREAD);
3191 JvmtiVMObjectAllocEventCollector oam;
3192 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3193 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3194 return (jstring) JNIHandles::make_local(result);
3195 JVM_END
3196
3197
3198 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3199 JVMWrapper("JVM_GetSystemPackages");
3200 JvmtiVMObjectAllocEventCollector oam;
3201 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3202 return (jobjectArray) JNIHandles::make_local(result);
3203 JVM_END
3204
3205
3206 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3207
3208
3209 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3210 JVMWrapper("JVM_GetAndClearReferencePendingList");
3211
3212 MonitorLockerEx ml(Heap_lock);
3213 oop ref = Universe::reference_pending_list();
3214 if (ref != NULL) {
3215 Universe::set_reference_pending_list(NULL);
3216 }
3217 return JNIHandles::make_local(env, ref);
3218 JVM_END
3219
3220 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3221 JVMWrapper("JVM_HasReferencePendingList");
3222 MonitorLockerEx ml(Heap_lock);
3223 return Universe::has_reference_pending_list();
3224 JVM_END
3225
3226 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3227 JVMWrapper("JVM_WaitForReferencePendingList");
3228 MonitorLockerEx ml(Heap_lock);
3229 while (!Universe::has_reference_pending_list()) {
3230 ml.wait();
3231 }
3232 JVM_END
3233
3234
3235 // ObjectInputStream ///////////////////////////////////////////////////////////////
3236
3237 // Return the first user-defined class loader up the execution stack, or null
3238 // if only code from the bootstrap or platform class loader is on the stack.
3239
3240 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3241 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3242 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3243 oop loader = vfst.method()->method_holder()->class_loader();
3244 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3245 return JNIHandles::make_local(env, loader);
3246 }
3247 }
3248 return NULL;
3249 JVM_END
3250
3251
3252 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3253
3254
3255 // resolve array handle and check arguments
3256 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3257 if (arr == NULL) {
3258 THROW_0(vmSymbols::java_lang_NullPointerException());
3259 }
3260 oop a = JNIHandles::resolve_non_null(arr);
3261 if (!a->is_array()) {
3262 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3263 } else if (type_array_only && !a->is_typeArray()) {
3264 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3265 }
3266 return arrayOop(a);
3267 }
3268
3269
3270 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3271 JVMWrapper("JVM_GetArrayLength");
3272 arrayOop a = check_array(env, arr, false, CHECK_0);
3273 return a->length();
3274 JVM_END
3275
3276
3277 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3278 JVMWrapper("JVM_Array_Get");
3279 JvmtiVMObjectAllocEventCollector oam;
3280 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3281 jvalue value;
3282 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3283 oop box = Reflection::box(&value, type, CHECK_NULL);
3284 return JNIHandles::make_local(env, box);
3285 JVM_END
3286
3287
3288 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3289 JVMWrapper("JVM_GetPrimitiveArrayElement");
3290 jvalue value;
3291 value.i = 0; // to initialize value before getting used in CHECK
3292 arrayOop a = check_array(env, arr, true, CHECK_(value));
3293 assert(a->is_typeArray(), "just checking");
3294 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3295 BasicType wide_type = (BasicType) wCode;
3296 if (type != wide_type) {
3297 Reflection::widen(&value, type, wide_type, CHECK_(value));
3298 }
3299 return value;
3300 JVM_END
3301
3302
3303 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3304 JVMWrapper("JVM_SetArrayElement");
3305 arrayOop a = check_array(env, arr, false, CHECK);
3306 oop box = JNIHandles::resolve(val);
3307 jvalue value;
3308 value.i = 0; // to initialize value before getting used in CHECK
3309 BasicType value_type;
3310 if (a->is_objArray()) {
3311 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3312 value_type = Reflection::unbox_for_regular_object(box, &value);
3313 } else {
3314 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3315 }
3316 Reflection::array_set(&value, a, index, value_type, CHECK);
3317 JVM_END
3318
3319
3320 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3321 JVMWrapper("JVM_SetPrimitiveArrayElement");
3322 arrayOop a = check_array(env, arr, true, CHECK);
3323 assert(a->is_typeArray(), "just checking");
3324 BasicType value_type = (BasicType) vCode;
3325 Reflection::array_set(&v, a, index, value_type, CHECK);
3326 JVM_END
3327
3328
3329 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3330 JVMWrapper("JVM_NewArray");
3331 JvmtiVMObjectAllocEventCollector oam;
3332 oop element_mirror = JNIHandles::resolve(eltClass);
3333 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3334 return JNIHandles::make_local(env, result);
3335 JVM_END
3336
3337
3338 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3339 JVMWrapper("JVM_NewMultiArray");
3340 JvmtiVMObjectAllocEventCollector oam;
3341 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3342 oop element_mirror = JNIHandles::resolve(eltClass);
3343 assert(dim_array->is_typeArray(), "just checking");
3344 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3345 return JNIHandles::make_local(env, result);
3346 JVM_END
3347
3348
3349 // Library support ///////////////////////////////////////////////////////////////////////////
3350
3351 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3352 //%note jvm_ct
3353 JVMWrapper("JVM_LoadLibrary");
3354 char ebuf[1024];
3355 void *load_result;
3356 {
3357 ThreadToNativeFromVM ttnfvm(thread);
3358 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3359 }
3360 if (load_result == NULL) {
3361 char msg[1024];
3362 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3363 // Since 'ebuf' may contain a string encoded using
3364 // platform encoding scheme, we need to pass
3365 // Exceptions::unsafe_to_utf8 to the new_exception method
3366 // as the last argument. See bug 6367357.
3367 Handle h_exception =
3368 Exceptions::new_exception(thread,
3369 vmSymbols::java_lang_UnsatisfiedLinkError(),
3370 msg, Exceptions::unsafe_to_utf8);
3371
3372 THROW_HANDLE_0(h_exception);
3373 }
3374 return load_result;
3375 JVM_END
3376
3377
3378 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3379 JVMWrapper("JVM_UnloadLibrary");
3380 os::dll_unload(handle);
3381 JVM_END
3382
3383
3384 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3385 JVMWrapper("JVM_FindLibraryEntry");
3386 return os::dll_lookup(handle, name);
3387 JVM_END
3388
3389
3390 // JNI version ///////////////////////////////////////////////////////////////////////////////
3391
3392 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3393 JVMWrapper("JVM_IsSupportedJNIVersion");
3394 return Threads::is_supported_jni_version_including_1_1(version);
3395 JVM_END
3396
3397
3398 // String support ///////////////////////////////////////////////////////////////////////////
3399
3400 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3401 JVMWrapper("JVM_InternString");
3402 JvmtiVMObjectAllocEventCollector oam;
3403 if (str == NULL) return NULL;
3404 oop string = JNIHandles::resolve_non_null(str);
3405 oop result = StringTable::intern(string, CHECK_NULL);
3406 return (jstring) JNIHandles::make_local(env, result);
3407 JVM_END
3408
3409
3410 // Raw monitor support //////////////////////////////////////////////////////////////////////
3411
3412 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3413 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3414 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3415 // that only works with java threads.
3416
3417
3418 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3419 VM_Exit::block_if_vm_exited();
3420 JVMWrapper("JVM_RawMonitorCreate");
3421 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3422 }
3423
3424
3425 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3426 VM_Exit::block_if_vm_exited();
3427 JVMWrapper("JVM_RawMonitorDestroy");
3428 delete ((Mutex*) mon);
3429 }
3430
3431
3432 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3433 VM_Exit::block_if_vm_exited();
3434 JVMWrapper("JVM_RawMonitorEnter");
3435 ((Mutex*) mon)->jvm_raw_lock();
3436 return 0;
3437 }
3438
3439
3440 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3441 VM_Exit::block_if_vm_exited();
3442 JVMWrapper("JVM_RawMonitorExit");
3443 ((Mutex*) mon)->jvm_raw_unlock();
3444 }
3445
3446
3447 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3448
3449 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3450 Handle loader, Handle protection_domain,
3451 jboolean throwError, TRAPS) {
3452 // Security Note:
3453 // The Java level wrapper will perform the necessary security check allowing
3454 // us to pass the NULL as the initiating class loader. The VM is responsible for
3455 // the checkPackageAccess relative to the initiating class loader via the
3456 // protection_domain. The protection_domain is passed as NULL by the java code
3457 // if there is no security manager in 3-arg Class.forName().
3458 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3459
3460 // Check if we should initialize the class
3461 if (init && klass->is_instance_klass()) {
3462 klass->initialize(CHECK_NULL);
3463 }
3464 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3465 }
3466
3467
3468 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3469
3470 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3471 JVMWrapper("JVM_InvokeMethod");
3472 Handle method_handle;
3473 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3474 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3475 Handle receiver(THREAD, JNIHandles::resolve(obj));
3476 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3477 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3478 jobject res = JNIHandles::make_local(env, result);
3479 if (JvmtiExport::should_post_vm_object_alloc()) {
3480 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3481 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3482 if (java_lang_Class::is_primitive(ret_type)) {
3483 // Only for primitive type vm allocates memory for java object.
3484 // See box() method.
3485 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3486 }
3487 }
3488 return res;
3489 } else {
3490 THROW_0(vmSymbols::java_lang_StackOverflowError());
3491 }
3492 JVM_END
3493
3494
3495 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3496 JVMWrapper("JVM_NewInstanceFromConstructor");
3497 oop constructor_mirror = JNIHandles::resolve(c);
3498 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3499 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3500 jobject res = JNIHandles::make_local(env, result);
3501 if (JvmtiExport::should_post_vm_object_alloc()) {
3502 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3503 }
3504 return res;
3505 JVM_END
3506
3507 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3508
3509 JVM_LEAF(jboolean, JVM_SupportsCX8())
3510 JVMWrapper("JVM_SupportsCX8");
3511 return VM_Version::supports_cx8();
3512 JVM_END
3513
3514 // Returns an array of all live Thread objects (VM internal JavaThreads,
3515 // jvmti agent threads, and JNI attaching threads are skipped)
3516 // See CR 6404306 regarding JNI attaching threads
3517 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3518 ResourceMark rm(THREAD);
3519 ThreadsListEnumerator tle(THREAD, false, false);
3520 JvmtiVMObjectAllocEventCollector oam;
3521
3522 int num_threads = tle.num_threads();
3523 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3524 objArrayHandle threads_ah(THREAD, r);
3525
3526 for (int i = 0; i < num_threads; i++) {
3527 Handle h = tle.get_threadObj(i);
3528 threads_ah->obj_at_put(i, h());
3529 }
3530
3531 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3532 JVM_END
3533
3534
3535 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3536 // Return StackTraceElement[][], each element is the stack trace of a thread in
3537 // the corresponding entry in the given threads array
3538 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3539 JVMWrapper("JVM_DumpThreads");
3540 JvmtiVMObjectAllocEventCollector oam;
3541
3542 // Check if threads is null
3543 if (threads == NULL) {
3544 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3545 }
3546
3547 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3548 objArrayHandle ah(THREAD, a);
3549 int num_threads = ah->length();
3550 // check if threads is non-empty array
3551 if (num_threads == 0) {
3552 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3553 }
3554
3555 // check if threads is not an array of objects of Thread class
3556 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3557 if (k != SystemDictionary::Thread_klass()) {
3558 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3559 }
3560
3561 ResourceMark rm(THREAD);
3562
3563 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3564 for (int i = 0; i < num_threads; i++) {
3565 oop thread_obj = ah->obj_at(i);
3566 instanceHandle h(THREAD, (instanceOop) thread_obj);
3567 thread_handle_array->append(h);
3568 }
3569
3570 // The JavaThread references in thread_handle_array are validated
3571 // in VM_ThreadDump::doit().
3572 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3573 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3574
3575 JVM_END
3576
3577 // JVM monitoring and management support
3578 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3579 return Management::get_jmm_interface(version);
3580 JVM_END
3581
3582 // com.sun.tools.attach.VirtualMachine agent properties support
3583 //
3584 // Initialize the agent properties with the properties maintained in the VM
3585 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3586 JVMWrapper("JVM_InitAgentProperties");
3587 ResourceMark rm;
3588
3589 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3590
3591 PUTPROP(props, "sun.java.command", Arguments::java_command());
3592 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3593 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3594 return properties;
3595 JVM_END
3596
3597 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3598 {
3599 JVMWrapper("JVM_GetEnclosingMethodInfo");
3600 JvmtiVMObjectAllocEventCollector oam;
3601
3602 if (ofClass == NULL) {
3603 return NULL;
3604 }
3605 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3606 // Special handling for primitive objects
3607 if (java_lang_Class::is_primitive(mirror())) {
3608 return NULL;
3609 }
3610 Klass* k = java_lang_Class::as_Klass(mirror());
3611 if (!k->is_instance_klass()) {
3612 return NULL;
3613 }
3614 InstanceKlass* ik = InstanceKlass::cast(k);
3615 int encl_method_class_idx = ik->enclosing_method_class_index();
3616 if (encl_method_class_idx == 0) {
3617 return NULL;
3618 }
3619 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3620 objArrayHandle dest(THREAD, dest_o);
3621 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3622 dest->obj_at_put(0, enc_k->java_mirror());
3623 int encl_method_method_idx = ik->enclosing_method_method_index();
3624 if (encl_method_method_idx != 0) {
3625 Symbol* sym = ik->constants()->symbol_at(
3626 extract_low_short_from_int(
3627 ik->constants()->name_and_type_at(encl_method_method_idx)));
3628 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3629 dest->obj_at_put(1, str());
3630 sym = ik->constants()->symbol_at(
3631 extract_high_short_from_int(
3632 ik->constants()->name_and_type_at(encl_method_method_idx)));
3633 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3634 dest->obj_at_put(2, str());
3635 }
3636 return (jobjectArray) JNIHandles::make_local(dest());
3637 }
3638 JVM_END
3639
3640 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3641 {
3642 memset(info, 0, info_size);
3643
3644 info->jvm_version = Abstract_VM_Version::jvm_version();
3645 info->patch_version = Abstract_VM_Version::vm_patch_version();
3646
3647 // when we add a new capability in the jvm_version_info struct, we should also
3648 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3649 // counter defined in runtimeService.cpp.
3650 info->is_attach_supported = AttachListener::is_attach_supported();
3651 }
3652 JVM_END
3653
3654 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3655 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3656 ResourceMark rm(THREAD);
3657
3658 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3659 return NULL;
3660 }
3661
3662 char** vm_flags = Arguments::jvm_flags_array();
3663 char** vm_args = Arguments::jvm_args_array();
3664 int num_flags = Arguments::num_jvm_flags();
3665 int num_args = Arguments::num_jvm_args();
3666
3667 InstanceKlass* ik = SystemDictionary::String_klass();
3668 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3669 objArrayHandle result_h(THREAD, r);
3670
3671 int index = 0;
3672 for (int j = 0; j < num_flags; j++, index++) {
3673 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3674 result_h->obj_at_put(index, h());
3675 }
3676 for (int i = 0; i < num_args; i++, index++) {
3677 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3678 result_h->obj_at_put(index, h());
3679 }
3680 return (jobjectArray) JNIHandles::make_local(env, result_h());
3681 JVM_END
3682
3683 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3684 return os::get_signal_number(name);
3685 JVM_END