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