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