1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/modules.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/stringTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "gc/shared/collectedHeap.inline.hpp"
39 #include "interpreter/bytecode.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "memory/resourceArea.hpp"
42 #include "memory/universe.inline.hpp"
43 #include "oops/access.inline.hpp"
44 #include "oops/fieldStreams.hpp"
45 #include "oops/instanceKlass.hpp"
46 #include "oops/method.hpp"
47 #include "oops/objArrayKlass.hpp"
48 #include "oops/objArrayOop.inline.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "oops/valueArrayKlass.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.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.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/sharedClassUtil.hpp"
88 #include "classfile/systemDictionaryShared.hpp"
89 #endif
90
91 #include <errno.h>
92
93 /*
94 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
95 such ctors and calls MUST NOT come between an oop declaration/init and its
96 usage because if objects are move this may cause various memory stomps, bus
97 errors and segfaults. Here is a cookbook for causing so called "naked oop
98 failures":
99
100 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
101 JVMWrapper("JVM_GetClassDeclaredFields");
102
103 // Object address to be held directly in mirror & not visible to GC
104 oop mirror = JNIHandles::resolve_non_null(ofClass);
105
106 // If this ctor can hit a safepoint, moving objects around, then
107 ComplexConstructor foo;
108
109 // Boom! mirror may point to JUNK instead of the intended object
110 (some dereference of mirror)
111
112 // Here's another call that may block for GC, making mirror stale
113 MutexLocker ml(some_lock);
114
115 // And here's an initializer that can result in a stale oop
116 // all in one step.
117 oop o = call_that_can_throw_exception(TRAPS);
118
119
120 The solution is to keep the oop declaration BELOW the ctor or function
121 call that might cause a GC, do another resolve to reassign the oop, or
122 consider use of a Handle instead of an oop so there is immunity from object
123 motion. But note that the "QUICK" entries below do not have a handlemark
124 and thus can only support use of handles passed in.
125 */
126
127 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
128 ResourceMark rm;
129 int line_number = -1;
130 const char * source_file = NULL;
131 const char * trace = "explicit";
132 InstanceKlass* caller = NULL;
133 JavaThread* jthread = JavaThread::current();
134 if (jthread->has_last_Java_frame()) {
135 vframeStream vfst(jthread);
136
137 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
138 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
139 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
140 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
141 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
142
143 Method* last_caller = NULL;
144
145 while (!vfst.at_end()) {
146 Method* m = vfst.method();
147 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
148 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
149 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
150 break;
151 }
152 last_caller = m;
153 vfst.next();
154 }
155 // if this is called from Class.forName0 and that is called from Class.forName,
156 // then print the caller of Class.forName. If this is Class.loadClass, then print
157 // that caller, otherwise keep quiet since this should be picked up elsewhere.
158 bool found_it = false;
159 if (!vfst.at_end() &&
160 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
161 vfst.method()->name() == vmSymbols::forName0_name()) {
162 vfst.next();
163 if (!vfst.at_end() &&
164 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
165 vfst.method()->name() == vmSymbols::forName_name()) {
166 vfst.next();
167 found_it = true;
168 }
169 } else if (last_caller != NULL &&
170 last_caller->method_holder()->name() ==
171 vmSymbols::java_lang_ClassLoader() &&
172 last_caller->name() == vmSymbols::loadClass_name()) {
173 found_it = true;
174 } else if (!vfst.at_end()) {
175 if (vfst.method()->is_native()) {
176 // JNI call
177 found_it = true;
178 }
179 }
180 if (found_it && !vfst.at_end()) {
181 // found the caller
182 caller = vfst.method()->method_holder();
183 line_number = vfst.method()->line_number_from_bci(vfst.bci());
184 if (line_number == -1) {
185 // show method name if it's a native method
186 trace = vfst.method()->name_and_sig_as_C_string();
187 }
188 Symbol* s = caller->source_file_name();
189 if (s != NULL) {
190 source_file = s->as_C_string();
191 }
192 }
193 }
194 if (caller != NULL) {
195 if (to_class != caller) {
196 const char * from = caller->external_name();
197 const char * to = to_class->external_name();
198 // print in a single call to reduce interleaving between threads
199 if (source_file != NULL) {
200 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
201 } else {
202 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
203 }
204 }
205 }
206 }
207
208 void trace_class_resolution(Klass* to_class) {
209 EXCEPTION_MARK;
210 trace_class_resolution_impl(to_class, THREAD);
211 if (HAS_PENDING_EXCEPTION) {
212 CLEAR_PENDING_EXCEPTION;
213 }
214 }
215
216 // Wrapper to trace JVM functions
217
218 #ifdef ASSERT
219 Histogram* JVMHistogram;
220 volatile int JVMHistogram_lock = 0;
221
222 class JVMHistogramElement : public HistogramElement {
223 public:
224 JVMHistogramElement(const char* name);
225 };
226
227 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
228 _name = elementName;
229 uintx count = 0;
230
231 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
232 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
233 count +=1;
234 if ( (WarnOnStalledSpinLock > 0)
235 && (count % WarnOnStalledSpinLock == 0)) {
236 warning("JVMHistogram_lock seems to be stalled");
237 }
238 }
239 }
240
241 if(JVMHistogram == NULL)
242 JVMHistogram = new Histogram("JVM Call Counts",100);
243
244 JVMHistogram->add_element(this);
245 Atomic::dec(&JVMHistogram_lock);
246 }
247
248 #define JVMCountWrapper(arg) \
249 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
250 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
251
252 #define JVMWrapper(arg) JVMCountWrapper(arg);
253 #else
254 #define JVMWrapper(arg)
255 #endif
256
257
258 // Interface version /////////////////////////////////////////////////////////////////////
259
260
261 JVM_LEAF(jint, JVM_GetInterfaceVersion())
262 return JVM_INTERFACE_VERSION;
263 JVM_END
264
265
266 // java.lang.System //////////////////////////////////////////////////////////////////////
267
268
269 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
270 JVMWrapper("JVM_CurrentTimeMillis");
271 return os::javaTimeMillis();
272 JVM_END
273
274 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
275 JVMWrapper("JVM_NanoTime");
276 return os::javaTimeNanos();
277 JVM_END
278
279 // The function below is actually exposed by jdk.internal.misc.VM and not
280 // java.lang.System, but we choose to keep it here so that it stays next
281 // to JVM_CurrentTimeMillis and JVM_NanoTime
282
283 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
284 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
285
286 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
287 JVMWrapper("JVM_GetNanoTimeAdjustment");
288 jlong seconds;
289 jlong nanos;
290
291 os::javaTimeSystemUTC(seconds, nanos);
292
293 // We're going to verify that the result can fit in a long.
294 // For that we need the difference in seconds between 'seconds'
295 // and 'offset_secs' to be such that:
296 // |seconds - offset_secs| < (2^63/10^9)
297 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
298 // which makes |seconds - offset_secs| < 2^33
299 // and we will prefer +/- 2^32 as the maximum acceptable diff
300 // as 2^32 has a more natural feel than 2^33...
301 //
302 // So if |seconds - offset_secs| >= 2^32 - we return a special
303 // sentinel value (-1) which the caller should take as an
304 // exception value indicating that the offset given to us is
305 // too far from range of the current time - leading to too big
306 // a nano adjustment. The caller is expected to recover by
307 // computing a more accurate offset and calling this method
308 // again. (For the record 2^32 secs is ~136 years, so that
309 // should rarely happen)
310 //
311 jlong diff = seconds - offset_secs;
312 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
313 return -1; // sentinel value: the offset is too far off the target
314 }
315
316 // return the adjustment. If you compute a time by adding
317 // this number of nanoseconds along with the number of seconds
318 // in the offset you should get the current UTC time.
319 return (diff * (jlong)1000000000) + nanos;
320 JVM_END
321
322 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
323 jobject dst, jint dst_pos, jint length))
324 JVMWrapper("JVM_ArrayCopy");
325 // Check if we have null pointers
326 if (src == NULL || dst == NULL) {
327 THROW(vmSymbols::java_lang_NullPointerException());
328 }
329 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
330 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
331 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
332 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
333 // Do copy
334 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
335 JVM_END
336
337
338 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
339 JavaValue r(T_OBJECT);
340 // public synchronized Object put(Object key, Object value);
341 HandleMark hm(THREAD);
342 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
343 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
344 JavaCalls::call_virtual(&r,
345 props,
346 SystemDictionary::Properties_klass(),
347 vmSymbols::put_name(),
348 vmSymbols::object_object_object_signature(),
349 key_str,
350 value_str,
351 THREAD);
352 }
353
354
355 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
356
357
358 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
359 JVMWrapper("JVM_InitProperties");
360 ResourceMark rm;
361
362 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
363
364 // System property list includes both user set via -D option and
365 // jvm system specific properties.
366 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
367 PUTPROP(props, p->key(), p->value());
368 }
369
370 // Convert the -XX:MaxDirectMemorySize= command line flag
371 // to the sun.nio.MaxDirectMemorySize property.
372 // Do this after setting user properties to prevent people
373 // from setting the value with a -D option, as requested.
374 {
375 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
376 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
377 } else {
378 char as_chars[256];
379 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
380 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
381 }
382 }
383
384 // JVM monitoring and management support
385 // Add the sun.management.compiler property for the compiler's name
386 {
387 #undef CSIZE
388 #if defined(_LP64) || defined(_WIN64)
389 #define CSIZE "64-Bit "
390 #else
391 #define CSIZE
392 #endif // 64bit
393
394 #ifdef TIERED
395 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
396 #else
397 #if defined(COMPILER1)
398 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
399 #elif defined(COMPILER2)
400 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
401 #elif INCLUDE_JVMCI
402 #error "INCLUDE_JVMCI should imply TIERED"
403 #else
404 const char* compiler_name = "";
405 #endif // compilers
406 #endif // TIERED
407
408 if (*compiler_name != '\0' &&
409 (Arguments::mode() != Arguments::_int)) {
410 PUTPROP(props, "sun.management.compiler", compiler_name);
411 }
412 }
413
414 return properties;
415 JVM_END
416
417
418 /*
419 * Return the temporary directory that the VM uses for the attach
420 * and perf data files.
421 *
422 * It is important that this directory is well-known and the
423 * same for all VM instances. It cannot be affected by configuration
424 * variables such as java.io.tmpdir.
425 */
426 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
427 JVMWrapper("JVM_GetTemporaryDirectory");
428 HandleMark hm(THREAD);
429 const char* temp_dir = os::get_temp_directory();
430 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
431 return (jstring) JNIHandles::make_local(env, h());
432 JVM_END
433
434
435 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
436
437 extern volatile jint vm_created;
438
439 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
440 JVMWrapper("JVM_BeforeHalt");
441 EventShutdown event;
442 if (event.should_commit()) {
443 event.set_reason("Shutdown requested from Java");
444 event.commit();
445 }
446 JVM_END
447
448
449 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
450 before_exit(thread);
451 vm_exit(code);
452 JVM_END
453
454
455 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
456 JVMWrapper("JVM_GC");
457 if (!DisableExplicitGC) {
458 Universe::heap()->collect(GCCause::_java_lang_system_gc);
459 }
460 JVM_END
461
462
463 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
464 JVMWrapper("JVM_MaxObjectInspectionAge");
465 return Universe::heap()->millis_since_last_gc();
466 JVM_END
467
468
469 static inline jlong convert_size_t_to_jlong(size_t val) {
470 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
471 NOT_LP64 (return (jlong)val;)
472 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
473 }
474
475 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
476 JVMWrapper("JVM_TotalMemory");
477 size_t n = Universe::heap()->capacity();
478 return convert_size_t_to_jlong(n);
479 JVM_END
480
481
482 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
483 JVMWrapper("JVM_FreeMemory");
484 CollectedHeap* ch = Universe::heap();
485 size_t n;
486 {
487 MutexLocker x(Heap_lock);
488 n = ch->capacity() - ch->used();
489 }
490 return convert_size_t_to_jlong(n);
491 JVM_END
492
493
494 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
495 JVMWrapper("JVM_MaxMemory");
496 size_t n = Universe::heap()->max_capacity();
497 return convert_size_t_to_jlong(n);
498 JVM_END
499
500
501 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
502 JVMWrapper("JVM_ActiveProcessorCount");
503 return os::active_processor_count();
504 JVM_END
505
506
507
508 // java.lang.Throwable //////////////////////////////////////////////////////
509
510
511 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
512 JVMWrapper("JVM_FillInStackTrace");
513 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
514 java_lang_Throwable::fill_in_stack_trace(exception);
515 JVM_END
516
517
518 // java.lang.StackTraceElement //////////////////////////////////////////////
519
520
521 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
522 JVMWrapper("JVM_InitStackTraceElementArray");
523 Handle exception(THREAD, JNIHandles::resolve(throwable));
524 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
525 objArrayHandle stack_trace(THREAD, st);
526 // Fill in the allocated stack trace
527 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
528 JVM_END
529
530
531 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
532 JVMWrapper("JVM_InitStackTraceElement");
533 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
534 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
535 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
536 JVM_END
537
538
539 // java.lang.StackWalker //////////////////////////////////////////////////////
540
541
542 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
543 jint skip_frames, jint frame_count, jint start_index,
544 jobjectArray frames))
545 JVMWrapper("JVM_CallStackWalk");
546 JavaThread* jt = (JavaThread*) THREAD;
547 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
548 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
549 }
550
551 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
552
553 // frames array is a Class<?>[] array when only getting caller reference,
554 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
555 // be null.
556 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
557 objArrayHandle frames_array_h(THREAD, fa);
558
559 int limit = start_index + frame_count;
560 if (frames_array_h->length() < limit) {
561 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
562 }
563
564 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
565 start_index, frames_array_h, CHECK_NULL);
566 return JNIHandles::make_local(env, result);
567 JVM_END
568
569
570 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
571 jint frame_count, jint start_index,
572 jobjectArray frames))
573 JVMWrapper("JVM_MoreStackWalk");
574 JavaThread* jt = (JavaThread*) THREAD;
575
576 // frames array is a Class<?>[] array when only getting caller reference,
577 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
578 // be null.
579 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
580 objArrayHandle frames_array_h(THREAD, fa);
581
582 int limit = start_index+frame_count;
583 if (frames_array_h->length() < limit) {
584 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
585 }
586
587 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
588 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
589 start_index, frames_array_h, THREAD);
590 JVM_END
591
592 // java.lang.Object ///////////////////////////////////////////////
593
594
595 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
596 JVMWrapper("JVM_IHashCode");
597 // as implemented in the classic virtual machine; return 0 if object is NULL
598 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
599 JVM_END
600
601
602 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
603 JVMWrapper("JVM_MonitorWait");
604 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
605 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
606 if (JvmtiExport::should_post_monitor_wait()) {
607 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
608
609 // The current thread already owns the monitor and it has not yet
610 // been added to the wait queue so the current thread cannot be
611 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
612 // event handler cannot accidentally consume an unpark() meant for
613 // the ParkEvent associated with this ObjectMonitor.
614 }
615 ObjectSynchronizer::wait(obj, ms, CHECK);
616 JVM_END
617
618
619 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
620 JVMWrapper("JVM_MonitorNotify");
621 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
622 ObjectSynchronizer::notify(obj, CHECK);
623 JVM_END
624
625
626 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
627 JVMWrapper("JVM_MonitorNotifyAll");
628 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
629 ObjectSynchronizer::notifyall(obj, CHECK);
630 JVM_END
631
632
633 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
634 JVMWrapper("JVM_Clone");
635 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
636 Klass* klass = obj->klass();
637 JvmtiVMObjectAllocEventCollector oam;
638
639 #ifdef ASSERT
640 // Just checking that the cloneable flag is set correct
641 if (obj->is_array()) {
642 guarantee(klass->is_cloneable(), "all arrays are cloneable");
643 } else {
644 guarantee(obj->is_instance(), "should be instanceOop");
645 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
646 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
647 }
648 #endif
649
650 // Check if class of obj supports the Cloneable interface.
651 // All arrays are considered to be cloneable (See JLS 20.1.5)
652 if (!klass->is_cloneable()) {
653 ResourceMark rm(THREAD);
654 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
655 }
656 assert(!obj->klass_is_value_type(), "Disallowed on value type");
657
658 // Make shallow object copy
659 const int size = obj->size();
660 oop new_obj_oop = NULL;
661 if (obj->is_array()) {
662 const int length = ((arrayOop)obj())->length();
663 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
664 } else {
665 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
666 }
667
668 HeapAccess<>::clone(obj(), new_obj_oop, size);
669
670 Handle new_obj(THREAD, new_obj_oop);
671 // Caution: this involves a java upcall, so the clone should be
672 // "gc-robust" by this stage.
673 if (klass->has_finalizer()) {
674 assert(obj->is_instance(), "should be instanceOop");
675 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
676 new_obj = Handle(THREAD, new_obj_oop);
677 }
678
679 return JNIHandles::make_local(env, new_obj());
680 JVM_END
681
682 // java.io.File ///////////////////////////////////////////////////////////////
683
684 JVM_LEAF(char*, JVM_NativePath(char* path))
685 JVMWrapper("JVM_NativePath");
686 return os::native_path(path);
687 JVM_END
688
689
690 // Misc. class handling ///////////////////////////////////////////////////////////
691
692
693 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
694 JVMWrapper("JVM_GetCallerClass");
695
696 // Getting the class of the caller frame.
697 //
698 // The call stack at this point looks something like this:
699 //
700 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
701 // [1] [ @CallerSensitive API.method ]
702 // [.] [ (skipped intermediate frames) ]
703 // [n] [ caller ]
704 vframeStream vfst(thread);
705 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
706 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
707 Method* m = vfst.method();
708 assert(m != NULL, "sanity");
709 switch (n) {
710 case 0:
711 // This must only be called from Reflection.getCallerClass
712 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
713 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
714 }
715 // fall-through
716 case 1:
717 // Frame 0 and 1 must be caller sensitive.
718 if (!m->caller_sensitive()) {
719 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
720 }
721 break;
722 default:
723 if (!m->is_ignored_by_security_stack_walk()) {
724 // We have reached the desired frame; return the holder class.
725 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
726 }
727 break;
728 }
729 }
730 return NULL;
731 JVM_END
732
733
734 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
735 JVMWrapper("JVM_FindPrimitiveClass");
736 oop mirror = NULL;
737 BasicType t = name2type(utf);
738 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
739 mirror = Universe::java_mirror(t);
740 }
741 if (mirror == NULL) {
742 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
743 } else {
744 return (jclass) JNIHandles::make_local(env, mirror);
745 }
746 JVM_END
747
748
749 // Returns a class loaded by the bootstrap class loader; or null
750 // if not found. ClassNotFoundException is not thrown.
751 // FindClassFromBootLoader is exported to the launcher for windows.
752 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
753 const char* name))
754 JVMWrapper("JVM_FindClassFromBootLoader");
755
756 // Java libraries should ensure that name is never null...
757 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
758 // It's impossible to create this class; the name cannot fit
759 // into the constant pool.
760 return NULL;
761 }
762
763 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
764 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
765 if (k == NULL) {
766 return NULL;
767 }
768
769 if (log_is_enabled(Debug, class, resolve)) {
770 trace_class_resolution(k);
771 }
772 return (jclass) JNIHandles::make_local(env, k->java_mirror());
773 JVM_END
774
775 // Find a class with this name in this loader, using the caller's protection domain.
776 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
777 jboolean init, jobject loader,
778 jclass caller))
779 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
780 // Java libraries should ensure that name is never null...
781 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
782 // It's impossible to create this class; the name cannot fit
783 // into the constant pool.
784 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
785 }
786
787 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
788
789 oop loader_oop = JNIHandles::resolve(loader);
790 oop from_class = JNIHandles::resolve(caller);
791 oop protection_domain = NULL;
792 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
793 // NPE. Put it in another way, the bootstrap class loader has all permission and
794 // thus no checkPackageAccess equivalence in the VM class loader.
795 // The caller is also passed as NULL by the java code if there is no security
796 // manager to avoid the performance cost of getting the calling class.
797 if (from_class != NULL && loader_oop != NULL) {
798 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
799 }
800
801 Handle h_loader(THREAD, loader_oop);
802 Handle h_prot(THREAD, protection_domain);
803 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
804 h_prot, false, THREAD);
805
806 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
807 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
808 }
809 return result;
810 JVM_END
811
812 // Currently only called from the old verifier.
813 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
814 jboolean init, jclass from))
815 JVMWrapper("JVM_FindClassFromClass");
816 if (name == NULL) {
817 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
818 }
819 if ((int)strlen(name) > Symbol::max_length()) {
820 // It's impossible to create this class; the name cannot fit
821 // into the constant pool.
822 Exceptions::fthrow(THREAD_AND_LOCATION,
823 vmSymbols::java_lang_NoClassDefFoundError(),
824 "Class name exceeds maximum length of %d: %s",
825 Symbol::max_length(),
826 name);
827 return 0;
828 }
829 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
830 oop from_class_oop = JNIHandles::resolve(from);
831 Klass* from_class = (from_class_oop == NULL)
832 ? (Klass*)NULL
833 : java_lang_Class::as_Klass(from_class_oop);
834 oop class_loader = NULL;
835 oop protection_domain = NULL;
836 if (from_class != NULL) {
837 class_loader = from_class->class_loader();
838 protection_domain = from_class->protection_domain();
839 }
840 Handle h_loader(THREAD, class_loader);
841 Handle h_prot (THREAD, protection_domain);
842 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
843 h_prot, true, thread);
844
845 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
846 // this function is generally only used for class loading during verification.
847 ResourceMark rm;
848 oop from_mirror = JNIHandles::resolve_non_null(from);
849 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
850 const char * from_name = from_class->external_name();
851
852 oop mirror = JNIHandles::resolve_non_null(result);
853 Klass* to_class = java_lang_Class::as_Klass(mirror);
854 const char * to = to_class->external_name();
855 log_debug(class, resolve)("%s %s (verification)", from_name, to);
856 }
857
858 return result;
859 JVM_END
860
861 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
862 if (loader.is_null()) {
863 return;
864 }
865
866 // check whether the current caller thread holds the lock or not.
867 // If not, increment the corresponding counter
868 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
869 ObjectSynchronizer::owner_self) {
870 counter->inc();
871 }
872 }
873
874 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
875 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
876 jobject loader, const jbyte *buf,
877 jsize len, jobject pd, const char *source,
878 TRAPS) {
879 if (source == NULL) source = "__JVM_DefineClass__";
880
881 assert(THREAD->is_Java_thread(), "must be a JavaThread");
882 JavaThread* jt = (JavaThread*) THREAD;
883
884 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
885 ClassLoader::perf_define_appclass_selftime(),
886 ClassLoader::perf_define_appclasses(),
887 jt->get_thread_stat()->perf_recursion_counts_addr(),
888 jt->get_thread_stat()->perf_timers_addr(),
889 PerfClassTraceTime::DEFINE_CLASS);
890
891 if (UsePerfData) {
892 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
893 }
894
895 // Since exceptions can be thrown, class initialization can take place
896 // if name is NULL no check for class name in .class stream has to be made.
897 TempNewSymbol class_name = NULL;
898 if (name != NULL) {
899 const int str_len = (int)strlen(name);
900 if (str_len > Symbol::max_length()) {
901 // It's impossible to create this class; the name cannot fit
902 // into the constant pool.
903 Exceptions::fthrow(THREAD_AND_LOCATION,
904 vmSymbols::java_lang_NoClassDefFoundError(),
905 "Class name exceeds maximum length of %d: %s",
906 Symbol::max_length(),
907 name);
908 return 0;
909 }
910 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
911 }
912
913 ResourceMark rm(THREAD);
914 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
915 Handle class_loader (THREAD, JNIHandles::resolve(loader));
916 if (UsePerfData) {
917 is_lock_held_by_thread(class_loader,
918 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
919 THREAD);
920 }
921 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
922 Klass* k = SystemDictionary::resolve_from_stream(class_name,
923 class_loader,
924 protection_domain,
925 &st,
926 CHECK_NULL);
927
928 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
929 trace_class_resolution(k);
930 }
931
932 return (jclass) JNIHandles::make_local(env, k->java_mirror());
933 }
934
935
936 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
937 JVMWrapper("JVM_DefineClass");
938
939 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
940 JVM_END
941
942
943 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
944 JVMWrapper("JVM_DefineClassWithSource");
945
946 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
947 JVM_END
948
949 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
950 JVMWrapper("JVM_FindLoadedClass");
951 ResourceMark rm(THREAD);
952
953 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
954 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
955
956 const char* str = java_lang_String::as_utf8_string(string());
957 // Sanity check, don't expect null
958 if (str == NULL) return NULL;
959
960 const int str_len = (int)strlen(str);
961 if (str_len > Symbol::max_length()) {
962 // It's impossible to create this class; the name cannot fit
963 // into the constant pool.
964 return NULL;
965 }
966 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
967
968 // Security Note:
969 // The Java level wrapper will perform the necessary security check allowing
970 // us to pass the NULL as the initiating class loader.
971 Handle h_loader(THREAD, JNIHandles::resolve(loader));
972 if (UsePerfData) {
973 is_lock_held_by_thread(h_loader,
974 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
975 THREAD);
976 }
977
978 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
979 h_loader,
980 Handle(),
981 CHECK_NULL);
982 #if INCLUDE_CDS
983 if (k == NULL) {
984 // If the class is not already loaded, try to see if it's in the shared
985 // archive for the current classloader (h_loader).
986 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
987 }
988 #endif
989 return (k == NULL) ? NULL :
990 (jclass) JNIHandles::make_local(env, k->java_mirror());
991 JVM_END
992
993 // Module support //////////////////////////////////////////////////////////////////////////////
994
995 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
996 jstring location, const char* const* packages, jsize num_packages))
997 JVMWrapper("JVM_DefineModule");
998 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
999 JVM_END
1000
1001 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1002 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1003 Modules::set_bootloader_unnamed_module(module, CHECK);
1004 JVM_END
1005
1006 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1007 JVMWrapper("JVM_AddModuleExports");
1008 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1009 JVM_END
1010
1011 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1012 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1013 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1014 JVM_END
1015
1016 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1017 JVMWrapper("JVM_AddModuleExportsToAll");
1018 Modules::add_module_exports(from_module, package, NULL, CHECK);
1019 JVM_END
1020
1021 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1022 JVMWrapper("JVM_AddReadsModule");
1023 Modules::add_reads_module(from_module, source_module, CHECK);
1024 JVM_END
1025
1026 // Reflection support //////////////////////////////////////////////////////////////////////////////
1027
1028 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1029 assert (cls != NULL, "illegal class");
1030 JVMWrapper("JVM_GetClassName");
1031 JvmtiVMObjectAllocEventCollector oam;
1032 ResourceMark rm(THREAD);
1033 const char* name;
1034 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1035 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1036 } else {
1037 // Consider caching interned string in Klass
1038 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1039 assert(k->is_klass(), "just checking");
1040 name = k->external_name();
1041 }
1042 oop result = StringTable::intern((char*) name, CHECK_NULL);
1043 return (jstring) JNIHandles::make_local(env, result);
1044 JVM_END
1045
1046
1047 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1048 JVMWrapper("JVM_GetClassInterfaces");
1049 JvmtiVMObjectAllocEventCollector oam;
1050 oop mirror = JNIHandles::resolve_non_null(cls);
1051
1052 // Special handling for primitive objects
1053 if (java_lang_Class::is_primitive(mirror)) {
1054 // Primitive objects does not have any interfaces
1055 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1056 return (jobjectArray) JNIHandles::make_local(env, r);
1057 }
1058
1059 Klass* klass = java_lang_Class::as_Klass(mirror);
1060 // Figure size of result array
1061 int size;
1062 if (klass->is_instance_klass()) {
1063 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1064 } else {
1065 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1066 size = 2;
1067 }
1068
1069 // Allocate result array
1070 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1071 objArrayHandle result (THREAD, r);
1072 // Fill in result
1073 if (klass->is_instance_klass()) {
1074 // Regular instance klass, fill in all local interfaces
1075 for (int index = 0; index < size; index++) {
1076 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1077 result->obj_at_put(index, k->java_mirror());
1078 }
1079 } else {
1080 // All arrays implement java.lang.Cloneable and java.io.Serializable
1081 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1082 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1083 }
1084 return (jobjectArray) JNIHandles::make_local(env, result());
1085 JVM_END
1086
1087
1088 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1089 JVMWrapper("JVM_IsInterface");
1090 oop mirror = JNIHandles::resolve_non_null(cls);
1091 if (java_lang_Class::is_primitive(mirror)) {
1092 return JNI_FALSE;
1093 }
1094 Klass* k = java_lang_Class::as_Klass(mirror);
1095 jboolean result = k->is_interface();
1096 assert(!result || k->is_instance_klass(),
1097 "all interfaces are instance types");
1098 // The compiler intrinsic for isInterface tests the
1099 // Klass::_access_flags bits in the same way.
1100 return result;
1101 JVM_END
1102
1103
1104 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1105 JVMWrapper("JVM_GetClassSigners");
1106 JvmtiVMObjectAllocEventCollector oam;
1107 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1108 // There are no signers for primitive types
1109 return NULL;
1110 }
1111
1112 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1113
1114 // If there are no signers set in the class, or if the class
1115 // is an array, return NULL.
1116 if (signers == NULL) return NULL;
1117
1118 // copy of the signers array
1119 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1120 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1121 for (int index = 0; index < signers->length(); index++) {
1122 signers_copy->obj_at_put(index, signers->obj_at(index));
1123 }
1124
1125 // return the copy
1126 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1127 JVM_END
1128
1129
1130 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1131 JVMWrapper("JVM_SetClassSigners");
1132 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1133 // This call is ignored for primitive types and arrays.
1134 // Signers are only set once, ClassLoader.java, and thus shouldn't
1135 // be called with an array. Only the bootstrap loader creates arrays.
1136 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1137 if (k->is_instance_klass()) {
1138 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1139 }
1140 }
1141 JVM_END
1142
1143
1144 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1145 JVMWrapper("JVM_GetProtectionDomain");
1146 if (JNIHandles::resolve(cls) == NULL) {
1147 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1148 }
1149
1150 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1151 // Primitive types does not have a protection domain.
1152 return NULL;
1153 }
1154
1155 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1156 return (jobject) JNIHandles::make_local(env, pd);
1157 JVM_END
1158
1159
1160 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) {
1161 // If there is a security manager and protection domain, check the access
1162 // in the protection domain, otherwise it is authorized.
1163 if (java_lang_System::has_security_manager()) {
1164
1165 // For bootstrapping, if pd implies method isn't in the JDK, allow
1166 // this context to revert to older behavior.
1167 // In this case the isAuthorized field in AccessControlContext is also not
1168 // present.
1169 if (Universe::protection_domain_implies_method() == NULL) {
1170 return true;
1171 }
1172
1173 // Whitelist certain access control contexts
1174 if (java_security_AccessControlContext::is_authorized(context)) {
1175 return true;
1176 }
1177
1178 oop prot = klass->protection_domain();
1179 if (prot != NULL) {
1180 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1181 // in the new wrapper.
1182 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1183 Handle h_prot(THREAD, prot);
1184 JavaValue result(T_BOOLEAN);
1185 JavaCallArguments args(h_prot);
1186 JavaCalls::call(&result, m, &args, CHECK_false);
1187 return (result.get_jboolean() != 0);
1188 }
1189 }
1190 return true;
1191 }
1192
1193 // Create an AccessControlContext with a protection domain with null codesource
1194 // and null permissions - which gives no permissions.
1195 oop create_dummy_access_control_context(TRAPS) {
1196 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1197 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1198 // Call constructor ProtectionDomain(null, null);
1199 JavaValue result(T_VOID);
1200 JavaCalls::call_special(&result, obj, pd_klass,
1201 vmSymbols::object_initializer_name(),
1202 vmSymbols::codesource_permissioncollection_signature(),
1203 Handle(), Handle(), CHECK_NULL);
1204
1205 // new ProtectionDomain[] {pd};
1206 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1207 context->obj_at_put(0, obj());
1208
1209 // new AccessControlContext(new ProtectionDomain[] {pd})
1210 objArrayHandle h_context(THREAD, context);
1211 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1212 return acc;
1213 }
1214
1215 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1216 JVMWrapper("JVM_DoPrivileged");
1217
1218 if (action == NULL) {
1219 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1220 }
1221
1222 // Compute the frame initiating the do privileged operation and setup the privileged stack
1223 vframeStream vfst(thread);
1224 vfst.security_get_caller_frame(1);
1225
1226 if (vfst.at_end()) {
1227 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1228 }
1229
1230 Method* method = vfst.method();
1231 InstanceKlass* klass = method->method_holder();
1232
1233 // Check that action object understands "Object run()"
1234 Handle h_context;
1235 if (context != NULL) {
1236 h_context = Handle(THREAD, JNIHandles::resolve(context));
1237 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1238 if (!authorized) {
1239 // Create an unprivileged access control object and call it's run function
1240 // instead.
1241 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1242 h_context = Handle(THREAD, noprivs);
1243 }
1244 }
1245
1246 // Check that action object understands "Object run()"
1247 Handle object (THREAD, JNIHandles::resolve(action));
1248
1249 // get run() method
1250 Method* m_oop = object->klass()->uncached_lookup_method(
1251 vmSymbols::run_method_name(),
1252 vmSymbols::void_object_signature(),
1253 Klass::find_overpass);
1254
1255 // See if there is a default method for "Object run()".
1256 if (m_oop == NULL && object->klass()->is_instance_klass()) {
1257 InstanceKlass* iklass = InstanceKlass::cast(object->klass());
1258 m_oop = iklass->lookup_method_in_ordered_interfaces(
1259 vmSymbols::run_method_name(),
1260 vmSymbols::void_object_signature());
1261 }
1262
1263 methodHandle m (THREAD, m_oop);
1264 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) {
1265 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1266 }
1267
1268 // Stack allocated list of privileged stack elements
1269 PrivilegedElement pi;
1270 if (!vfst.at_end()) {
1271 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1272 thread->set_privileged_stack_top(&pi);
1273 }
1274
1275
1276 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1277 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1278 Handle pending_exception;
1279 JavaValue result(T_OBJECT);
1280 JavaCallArguments args(object);
1281 JavaCalls::call(&result, m, &args, THREAD);
1282
1283 // done with action, remove ourselves from the list
1284 if (!vfst.at_end()) {
1285 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1286 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1287 }
1288
1289 if (HAS_PENDING_EXCEPTION) {
1290 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1291 CLEAR_PENDING_EXCEPTION;
1292 // JVMTI has already reported the pending exception
1293 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1294 if (THREAD->is_Java_thread()) {
1295 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1296 }
1297 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1298 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1299 // Throw a java.security.PrivilegedActionException(Exception e) exception
1300 JavaCallArguments args(pending_exception);
1301 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1302 vmSymbols::exception_void_signature(),
1303 &args);
1304 }
1305 }
1306
1307 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1308 return JNIHandles::make_local(env, (oop) result.get_jobject());
1309 JVM_END
1310
1311
1312 // Returns the inherited_access_control_context field of the running thread.
1313 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1314 JVMWrapper("JVM_GetInheritedAccessControlContext");
1315 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1316 return JNIHandles::make_local(env, result);
1317 JVM_END
1318
1319 class RegisterArrayForGC {
1320 private:
1321 JavaThread *_thread;
1322 public:
1323 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1324 _thread = thread;
1325 _thread->register_array_for_gc(array);
1326 }
1327
1328 ~RegisterArrayForGC() {
1329 _thread->register_array_for_gc(NULL);
1330 }
1331 };
1332
1333
1334 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1335 JVMWrapper("JVM_GetStackAccessControlContext");
1336 if (!UsePrivilegedStack) return NULL;
1337
1338 ResourceMark rm(THREAD);
1339 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1340 JvmtiVMObjectAllocEventCollector oam;
1341
1342 // count the protection domains on the execution stack. We collapse
1343 // duplicate consecutive protection domains into a single one, as
1344 // well as stopping when we hit a privileged frame.
1345
1346 // Use vframeStream to iterate through Java frames
1347 vframeStream vfst(thread);
1348
1349 oop previous_protection_domain = NULL;
1350 Handle privileged_context(thread, NULL);
1351 bool is_privileged = false;
1352 oop protection_domain = NULL;
1353
1354 for(; !vfst.at_end(); vfst.next()) {
1355 // get method of frame
1356 Method* method = vfst.method();
1357 intptr_t* frame_id = vfst.frame_id();
1358
1359 // check the privileged frames to see if we have a match
1360 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1361 // this frame is privileged
1362 is_privileged = true;
1363 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1364 protection_domain = thread->privileged_stack_top()->protection_domain();
1365 } else {
1366 protection_domain = method->method_holder()->protection_domain();
1367 }
1368
1369 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1370 local_array->push(protection_domain);
1371 previous_protection_domain = protection_domain;
1372 }
1373
1374 if (is_privileged) break;
1375 }
1376
1377
1378 // either all the domains on the stack were system domains, or
1379 // we had a privileged system domain
1380 if (local_array->is_empty()) {
1381 if (is_privileged && privileged_context.is_null()) return NULL;
1382
1383 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1384 return JNIHandles::make_local(env, result);
1385 }
1386
1387 // the resource area must be registered in case of a gc
1388 RegisterArrayForGC ragc(thread, local_array);
1389 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1390 local_array->length(), CHECK_NULL);
1391 objArrayHandle h_context(thread, context);
1392 for (int index = 0; index < local_array->length(); index++) {
1393 h_context->obj_at_put(index, local_array->at(index));
1394 }
1395
1396 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1397
1398 return JNIHandles::make_local(env, result);
1399 JVM_END
1400
1401
1402 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1403 JVMWrapper("JVM_IsArrayClass");
1404 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1405 return (k != NULL) && k->is_array_klass() ? true : false;
1406 JVM_END
1407
1408
1409 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1410 JVMWrapper("JVM_IsPrimitiveClass");
1411 oop mirror = JNIHandles::resolve_non_null(cls);
1412 return (jboolean) java_lang_Class::is_primitive(mirror);
1413 JVM_END
1414
1415
1416 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1417 JVMWrapper("JVM_GetClassModifiers");
1418 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1419 // Primitive type
1420 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1421 }
1422
1423 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1424 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1425 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1426 return k->modifier_flags();
1427 JVM_END
1428
1429
1430 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1431
1432 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1433 JvmtiVMObjectAllocEventCollector oam;
1434 // ofClass is a reference to a java_lang_Class object. The mirror object
1435 // of an InstanceKlass
1436
1437 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1438 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1439 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1440 return (jobjectArray)JNIHandles::make_local(env, result);
1441 }
1442
1443 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1444 InnerClassesIterator iter(k);
1445
1446 if (iter.length() == 0) {
1447 // Neither an inner nor outer class
1448 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1449 return (jobjectArray)JNIHandles::make_local(env, result);
1450 }
1451
1452 // find inner class info
1453 constantPoolHandle cp(thread, k->constants());
1454 int length = iter.length();
1455
1456 // Allocate temp. result array
1457 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1458 objArrayHandle result (THREAD, r);
1459 int members = 0;
1460
1461 for (; !iter.done(); iter.next()) {
1462 int ioff = iter.inner_class_info_index();
1463 int ooff = iter.outer_class_info_index();
1464
1465 if (ioff != 0 && ooff != 0) {
1466 // Check to see if the name matches the class we're looking for
1467 // before attempting to find the class.
1468 if (cp->klass_name_at_matches(k, ooff)) {
1469 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1470 if (outer_klass == k) {
1471 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1472 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1473
1474 // Throws an exception if outer klass has not declared k as
1475 // an inner klass
1476 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1477
1478 result->obj_at_put(members, inner_klass->java_mirror());
1479 members++;
1480 }
1481 }
1482 }
1483 }
1484
1485 if (members != length) {
1486 // Return array of right length
1487 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1488 for(int i = 0; i < members; i++) {
1489 res->obj_at_put(i, result->obj_at(i));
1490 }
1491 return (jobjectArray)JNIHandles::make_local(env, res);
1492 }
1493
1494 return (jobjectArray)JNIHandles::make_local(env, result());
1495 JVM_END
1496
1497
1498 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1499 {
1500 // ofClass is a reference to a java_lang_Class object.
1501 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1502 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1503 return NULL;
1504 }
1505
1506 bool inner_is_member = false;
1507 Klass* outer_klass
1508 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1509 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1510 if (outer_klass == NULL) return NULL; // already a top-level class
1511 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1512 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1513 }
1514 JVM_END
1515
1516 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1517 {
1518 oop mirror = JNIHandles::resolve_non_null(cls);
1519 if (java_lang_Class::is_primitive(mirror) ||
1520 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1521 return NULL;
1522 }
1523 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1524 int ooff = 0, noff = 0;
1525 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1526 if (noff != 0) {
1527 constantPoolHandle i_cp(thread, k->constants());
1528 Symbol* name = i_cp->symbol_at(noff);
1529 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1530 return (jstring) JNIHandles::make_local(env, str());
1531 }
1532 }
1533 return NULL;
1534 }
1535 JVM_END
1536
1537 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1538 assert (cls != NULL, "illegal class");
1539 JVMWrapper("JVM_GetClassSignature");
1540 JvmtiVMObjectAllocEventCollector oam;
1541 ResourceMark rm(THREAD);
1542 // Return null for arrays and primatives
1543 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1544 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1545 if (k->is_instance_klass()) {
1546 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1547 if (sym == NULL) return NULL;
1548 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1549 return (jstring) JNIHandles::make_local(env, str());
1550 }
1551 }
1552 return NULL;
1553 JVM_END
1554
1555
1556 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1557 assert (cls != NULL, "illegal class");
1558 JVMWrapper("JVM_GetClassAnnotations");
1559
1560 // Return null for arrays and primitives
1561 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1562 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1563 if (k->is_instance_klass()) {
1564 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1565 return (jbyteArray) JNIHandles::make_local(env, a);
1566 }
1567 }
1568 return NULL;
1569 JVM_END
1570
1571
1572 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1573 // some of this code was adapted from from jni_FromReflectedField
1574
1575 oop reflected = JNIHandles::resolve_non_null(field);
1576 oop mirror = java_lang_reflect_Field::clazz(reflected);
1577 Klass* k = java_lang_Class::as_Klass(mirror);
1578 int slot = java_lang_reflect_Field::slot(reflected);
1579 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1580
1581 InstanceKlass* ik = InstanceKlass::cast(k);
1582 intptr_t offset = ik->field_offset(slot);
1583
1584 if (modifiers & JVM_ACC_STATIC) {
1585 // for static fields we only look in the current class
1586 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1587 assert(false, "cannot find static field");
1588 return false;
1589 }
1590 } else {
1591 // for instance fields we start with the current class and work
1592 // our way up through the superclass chain
1593 if (!ik->find_field_from_offset(offset, false, &fd)) {
1594 assert(false, "cannot find instance field");
1595 return false;
1596 }
1597 }
1598 return true;
1599 }
1600
1601 static Method* jvm_get_method_common(jobject method) {
1602 // some of this code was adapted from from jni_FromReflectedMethod
1603
1604 oop reflected = JNIHandles::resolve_non_null(method);
1605 oop mirror = NULL;
1606 int slot = 0;
1607
1608 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1609 mirror = java_lang_reflect_Constructor::clazz(reflected);
1610 slot = java_lang_reflect_Constructor::slot(reflected);
1611 } else {
1612 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1613 "wrong type");
1614 mirror = java_lang_reflect_Method::clazz(reflected);
1615 slot = java_lang_reflect_Method::slot(reflected);
1616 }
1617 Klass* k = java_lang_Class::as_Klass(mirror);
1618
1619 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1620 assert(m != NULL, "cannot find method");
1621 return m; // caller has to deal with NULL in product mode
1622 }
1623
1624 /* Type use annotations support (JDK 1.8) */
1625
1626 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1627 assert (cls != NULL, "illegal class");
1628 JVMWrapper("JVM_GetClassTypeAnnotations");
1629 ResourceMark rm(THREAD);
1630 // Return null for arrays and primitives
1631 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1632 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1633 if (k->is_instance_klass()) {
1634 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1635 if (type_annotations != NULL) {
1636 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1637 return (jbyteArray) JNIHandles::make_local(env, a);
1638 }
1639 }
1640 }
1641 return NULL;
1642 JVM_END
1643
1644 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1645 assert (method != NULL, "illegal method");
1646 JVMWrapper("JVM_GetMethodTypeAnnotations");
1647
1648 // method is a handle to a java.lang.reflect.Method object
1649 Method* m = jvm_get_method_common(method);
1650 if (m == NULL) {
1651 return NULL;
1652 }
1653
1654 AnnotationArray* type_annotations = m->type_annotations();
1655 if (type_annotations != NULL) {
1656 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1657 return (jbyteArray) JNIHandles::make_local(env, a);
1658 }
1659
1660 return NULL;
1661 JVM_END
1662
1663 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1664 assert (field != NULL, "illegal field");
1665 JVMWrapper("JVM_GetFieldTypeAnnotations");
1666
1667 fieldDescriptor fd;
1668 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1669 if (!gotFd) {
1670 return NULL;
1671 }
1672
1673 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1674 JVM_END
1675
1676 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1677 if (!cp->is_within_bounds(index)) {
1678 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1679 }
1680 }
1681
1682 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1683 {
1684 JVMWrapper("JVM_GetMethodParameters");
1685 // method is a handle to a java.lang.reflect.Method object
1686 Method* method_ptr = jvm_get_method_common(method);
1687 methodHandle mh (THREAD, method_ptr);
1688 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1689 const int num_params = mh->method_parameters_length();
1690
1691 if (num_params < 0) {
1692 // A -1 return value from method_parameters_length means there is no
1693 // parameter data. Return null to indicate this to the reflection
1694 // API.
1695 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1696 return (jobjectArray)NULL;
1697 } else {
1698 // Otherwise, we return something up to reflection, even if it is
1699 // a zero-length array. Why? Because in some cases this can
1700 // trigger a MalformedParametersException.
1701
1702 // make sure all the symbols are properly formatted
1703 for (int i = 0; i < num_params; i++) {
1704 MethodParametersElement* params = mh->method_parameters_start();
1705 int index = params[i].name_cp_index;
1706 bounds_check(mh->constants(), index, CHECK_NULL);
1707
1708 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1709 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1710 "Wrong type at constant pool index");
1711 }
1712
1713 }
1714
1715 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1716 objArrayHandle result (THREAD, result_oop);
1717
1718 for (int i = 0; i < num_params; i++) {
1719 MethodParametersElement* params = mh->method_parameters_start();
1720 // For a 0 index, give a NULL symbol
1721 Symbol* sym = 0 != params[i].name_cp_index ?
1722 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1723 int flags = params[i].flags;
1724 oop param = Reflection::new_parameter(reflected_method, i, sym,
1725 flags, CHECK_NULL);
1726 result->obj_at_put(i, param);
1727 }
1728 return (jobjectArray)JNIHandles::make_local(env, result());
1729 }
1730 }
1731 JVM_END
1732
1733 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1734
1735 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1736 {
1737 JVMWrapper("JVM_GetClassDeclaredFields");
1738 JvmtiVMObjectAllocEventCollector oam;
1739
1740 // Exclude primitive types and array types
1741 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1742 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1743 // Return empty array
1744 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1745 return (jobjectArray) JNIHandles::make_local(env, res);
1746 }
1747
1748 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1749 constantPoolHandle cp(THREAD, k->constants());
1750
1751 // Ensure class is linked
1752 k->link_class(CHECK_NULL);
1753
1754 // Allocate result
1755 int num_fields;
1756
1757 if (publicOnly) {
1758 num_fields = 0;
1759 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1760 if (fs.access_flags().is_public()) ++num_fields;
1761 }
1762 } else {
1763 num_fields = k->java_fields_count();
1764 }
1765
1766 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1767 objArrayHandle result (THREAD, r);
1768
1769 int out_idx = 0;
1770 fieldDescriptor fd;
1771 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1772 if (!publicOnly || fs.access_flags().is_public()) {
1773 fd.reinitialize(k, fs.index());
1774 oop field = Reflection::new_field(&fd, CHECK_NULL);
1775 result->obj_at_put(out_idx, field);
1776 ++out_idx;
1777 }
1778 }
1779 assert(out_idx == num_fields, "just checking");
1780 return (jobjectArray) JNIHandles::make_local(env, result());
1781 }
1782 JVM_END
1783
1784 static bool select_method(const methodHandle& method, bool want_constructor) {
1785 if (want_constructor) {
1786 return (method->is_initializer() && !method->is_static());
1787 } else {
1788 return (!method->is_initializer() && !method->is_overpass());
1789 }
1790 }
1791
1792 static jobjectArray get_class_declared_methods_helper(
1793 JNIEnv *env,
1794 jclass ofClass, jboolean publicOnly,
1795 bool want_constructor,
1796 Klass* klass, TRAPS) {
1797
1798 JvmtiVMObjectAllocEventCollector oam;
1799
1800 // Exclude primitive types and array types
1801 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1802 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1803 // Return empty array
1804 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1805 return (jobjectArray) JNIHandles::make_local(env, res);
1806 }
1807
1808 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1809
1810 // Ensure class is linked
1811 k->link_class(CHECK_NULL);
1812
1813 Array<Method*>* methods = k->methods();
1814 int methods_length = methods->length();
1815
1816 // Save original method_idnum in case of redefinition, which can change
1817 // the idnum of obsolete methods. The new method will have the same idnum
1818 // but if we refresh the methods array, the counts will be wrong.
1819 ResourceMark rm(THREAD);
1820 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1821 int num_methods = 0;
1822
1823 for (int i = 0; i < methods_length; i++) {
1824 methodHandle method(THREAD, methods->at(i));
1825 if (select_method(method, want_constructor)) {
1826 if (!publicOnly || method->is_public()) {
1827 idnums->push(method->method_idnum());
1828 ++num_methods;
1829 }
1830 }
1831 }
1832
1833 // Allocate result
1834 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1835 objArrayHandle result (THREAD, r);
1836
1837 // Now just put the methods that we selected above, but go by their idnum
1838 // in case of redefinition. The methods can be redefined at any safepoint,
1839 // so above when allocating the oop array and below when creating reflect
1840 // objects.
1841 for (int i = 0; i < num_methods; i++) {
1842 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1843 if (method.is_null()) {
1844 // Method may have been deleted and seems this API can handle null
1845 // Otherwise should probably put a method that throws NSME
1846 result->obj_at_put(i, NULL);
1847 } else {
1848 oop m;
1849 if (want_constructor) {
1850 m = Reflection::new_constructor(method, CHECK_NULL);
1851 } else {
1852 m = Reflection::new_method(method, false, CHECK_NULL);
1853 }
1854 result->obj_at_put(i, m);
1855 }
1856 }
1857
1858 return (jobjectArray) JNIHandles::make_local(env, result());
1859 }
1860
1861 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1862 {
1863 JVMWrapper("JVM_GetClassDeclaredMethods");
1864 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1865 /*want_constructor*/ false,
1866 SystemDictionary::reflect_Method_klass(), THREAD);
1867 }
1868 JVM_END
1869
1870 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1871 {
1872 JVMWrapper("JVM_GetClassDeclaredConstructors");
1873 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1874 /*want_constructor*/ true,
1875 SystemDictionary::reflect_Constructor_klass(), THREAD);
1876 }
1877 JVM_END
1878
1879 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1880 {
1881 JVMWrapper("JVM_GetClassAccessFlags");
1882 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1883 // Primitive type
1884 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1885 }
1886
1887 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1888 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1889 }
1890 JVM_END
1891
1892
1893 // Constant pool access //////////////////////////////////////////////////////////
1894
1895 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1896 {
1897 JVMWrapper("JVM_GetClassConstantPool");
1898 JvmtiVMObjectAllocEventCollector oam;
1899
1900 // Return null for primitives and arrays
1901 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1902 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1903 if (k->is_instance_klass()) {
1904 InstanceKlass* k_h = InstanceKlass::cast(k);
1905 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1906 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1907 return JNIHandles::make_local(jcp());
1908 }
1909 }
1910 return NULL;
1911 }
1912 JVM_END
1913
1914
1915 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1916 {
1917 JVMWrapper("JVM_ConstantPoolGetSize");
1918 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1919 return cp->length();
1920 }
1921 JVM_END
1922
1923
1924 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1925 {
1926 JVMWrapper("JVM_ConstantPoolGetClassAt");
1927 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1928 bounds_check(cp, index, CHECK_NULL);
1929 constantTag tag = cp->tag_at(index);
1930 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1931 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1932 }
1933 Klass* k = cp->klass_at(index, CHECK_NULL);
1934 return (jclass) JNIHandles::make_local(k->java_mirror());
1935 }
1936 JVM_END
1937
1938 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1939 {
1940 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1941 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1942 bounds_check(cp, index, CHECK_NULL);
1943 constantTag tag = cp->tag_at(index);
1944 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1945 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1946 }
1947 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1948 if (k == NULL) return NULL;
1949 return (jclass) JNIHandles::make_local(k->java_mirror());
1950 }
1951 JVM_END
1952
1953 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1954 constantTag tag = cp->tag_at(index);
1955 if (!tag.is_method() && !tag.is_interface_method()) {
1956 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1957 }
1958 int klass_ref = cp->uncached_klass_ref_index_at(index);
1959 Klass* k_o;
1960 if (force_resolution) {
1961 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1962 } else {
1963 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1964 if (k_o == NULL) return NULL;
1965 }
1966 InstanceKlass* k = InstanceKlass::cast(k_o);
1967 Symbol* name = cp->uncached_name_ref_at(index);
1968 Symbol* sig = cp->uncached_signature_ref_at(index);
1969 methodHandle m (THREAD, k->find_method(name, sig));
1970 if (m.is_null()) {
1971 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1972 }
1973 oop method;
1974 if (!m->is_initializer() || m->is_static()) {
1975 method = Reflection::new_method(m, true, CHECK_NULL);
1976 } else {
1977 method = Reflection::new_constructor(m, CHECK_NULL);
1978 }
1979 return JNIHandles::make_local(method);
1980 }
1981
1982 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1983 {
1984 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1985 JvmtiVMObjectAllocEventCollector oam;
1986 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1987 bounds_check(cp, index, CHECK_NULL);
1988 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1989 return res;
1990 }
1991 JVM_END
1992
1993 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1994 {
1995 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1996 JvmtiVMObjectAllocEventCollector oam;
1997 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1998 bounds_check(cp, index, CHECK_NULL);
1999 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2000 return res;
2001 }
2002 JVM_END
2003
2004 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2005 constantTag tag = cp->tag_at(index);
2006 if (!tag.is_field()) {
2007 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2008 }
2009 int klass_ref = cp->uncached_klass_ref_index_at(index);
2010 Klass* k_o;
2011 if (force_resolution) {
2012 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2013 } else {
2014 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2015 if (k_o == NULL) return NULL;
2016 }
2017 InstanceKlass* k = InstanceKlass::cast(k_o);
2018 Symbol* name = cp->uncached_name_ref_at(index);
2019 Symbol* sig = cp->uncached_signature_ref_at(index);
2020 fieldDescriptor fd;
2021 Klass* target_klass = k->find_field(name, sig, &fd);
2022 if (target_klass == NULL) {
2023 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2024 }
2025 oop field = Reflection::new_field(&fd, CHECK_NULL);
2026 return JNIHandles::make_local(field);
2027 }
2028
2029 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2030 {
2031 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2032 JvmtiVMObjectAllocEventCollector oam;
2033 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2034 bounds_check(cp, index, CHECK_NULL);
2035 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2036 return res;
2037 }
2038 JVM_END
2039
2040 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2041 {
2042 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2043 JvmtiVMObjectAllocEventCollector oam;
2044 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2045 bounds_check(cp, index, CHECK_NULL);
2046 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2047 return res;
2048 }
2049 JVM_END
2050
2051 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2052 {
2053 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2054 JvmtiVMObjectAllocEventCollector oam;
2055 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2056 bounds_check(cp, index, CHECK_NULL);
2057 constantTag tag = cp->tag_at(index);
2058 if (!tag.is_field_or_method()) {
2059 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2060 }
2061 int klass_ref = cp->uncached_klass_ref_index_at(index);
2062 Symbol* klass_name = cp->klass_name_at(klass_ref);
2063 Symbol* member_name = cp->uncached_name_ref_at(index);
2064 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2065 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2066 objArrayHandle dest(THREAD, dest_o);
2067 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2068 dest->obj_at_put(0, str());
2069 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2070 dest->obj_at_put(1, str());
2071 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2072 dest->obj_at_put(2, str());
2073 return (jobjectArray) JNIHandles::make_local(dest());
2074 }
2075 JVM_END
2076
2077 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2078 {
2079 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2080 JvmtiVMObjectAllocEventCollector oam;
2081 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2082 bounds_check(cp, index, CHECK_0);
2083 constantTag tag = cp->tag_at(index);
2084 if (!tag.is_field_or_method()) {
2085 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2086 }
2087 return (jint) cp->uncached_klass_ref_index_at(index);
2088 }
2089 JVM_END
2090
2091 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2092 {
2093 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2094 JvmtiVMObjectAllocEventCollector oam;
2095 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2096 bounds_check(cp, index, CHECK_0);
2097 constantTag tag = cp->tag_at(index);
2098 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2099 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2100 }
2101 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2102 }
2103 JVM_END
2104
2105 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2106 {
2107 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2108 JvmtiVMObjectAllocEventCollector oam;
2109 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2110 bounds_check(cp, index, CHECK_NULL);
2111 constantTag tag = cp->tag_at(index);
2112 if (!tag.is_name_and_type()) {
2113 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2114 }
2115 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2116 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2117 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2118 objArrayHandle dest(THREAD, dest_o);
2119 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2120 dest->obj_at_put(0, str());
2121 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2122 dest->obj_at_put(1, str());
2123 return (jobjectArray) JNIHandles::make_local(dest());
2124 }
2125 JVM_END
2126
2127 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2128 {
2129 JVMWrapper("JVM_ConstantPoolGetIntAt");
2130 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2131 bounds_check(cp, index, CHECK_0);
2132 constantTag tag = cp->tag_at(index);
2133 if (!tag.is_int()) {
2134 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2135 }
2136 return cp->int_at(index);
2137 }
2138 JVM_END
2139
2140 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2141 {
2142 JVMWrapper("JVM_ConstantPoolGetLongAt");
2143 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2144 bounds_check(cp, index, CHECK_(0L));
2145 constantTag tag = cp->tag_at(index);
2146 if (!tag.is_long()) {
2147 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2148 }
2149 return cp->long_at(index);
2150 }
2151 JVM_END
2152
2153 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2154 {
2155 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2156 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2157 bounds_check(cp, index, CHECK_(0.0f));
2158 constantTag tag = cp->tag_at(index);
2159 if (!tag.is_float()) {
2160 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2161 }
2162 return cp->float_at(index);
2163 }
2164 JVM_END
2165
2166 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2167 {
2168 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2169 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2170 bounds_check(cp, index, CHECK_(0.0));
2171 constantTag tag = cp->tag_at(index);
2172 if (!tag.is_double()) {
2173 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2174 }
2175 return cp->double_at(index);
2176 }
2177 JVM_END
2178
2179 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2180 {
2181 JVMWrapper("JVM_ConstantPoolGetStringAt");
2182 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2183 bounds_check(cp, index, CHECK_NULL);
2184 constantTag tag = cp->tag_at(index);
2185 if (!tag.is_string()) {
2186 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2187 }
2188 oop str = cp->string_at(index, CHECK_NULL);
2189 return (jstring) JNIHandles::make_local(str);
2190 }
2191 JVM_END
2192
2193 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2194 {
2195 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2196 JvmtiVMObjectAllocEventCollector oam;
2197 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2198 bounds_check(cp, index, CHECK_NULL);
2199 constantTag tag = cp->tag_at(index);
2200 if (!tag.is_symbol()) {
2201 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2202 }
2203 Symbol* sym = cp->symbol_at(index);
2204 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2205 return (jstring) JNIHandles::make_local(str());
2206 }
2207 JVM_END
2208
2209 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2210 {
2211 JVMWrapper("JVM_ConstantPoolGetTagAt");
2212 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2213 bounds_check(cp, index, CHECK_0);
2214 constantTag tag = cp->tag_at(index);
2215 jbyte result = tag.value();
2216 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2217 // they are changed to the corresponding tags from the JVM spec, so that java code in
2218 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2219 if (tag.is_klass_or_reference()) {
2220 result = JVM_CONSTANT_Class;
2221 } else if (tag.is_string_index()) {
2222 result = JVM_CONSTANT_String;
2223 } else if (tag.is_method_type_in_error()) {
2224 result = JVM_CONSTANT_MethodType;
2225 } else if (tag.is_method_handle_in_error()) {
2226 result = JVM_CONSTANT_MethodHandle;
2227 } else if (tag.is_dynamic_constant_in_error()) {
2228 result = JVM_CONSTANT_Dynamic;
2229 }
2230 return result;
2231 }
2232 JVM_END
2233
2234 // Assertion support. //////////////////////////////////////////////////////////
2235
2236 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2237 JVMWrapper("JVM_DesiredAssertionStatus");
2238 assert(cls != NULL, "bad class");
2239
2240 oop r = JNIHandles::resolve(cls);
2241 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2242 if (java_lang_Class::is_primitive(r)) return false;
2243
2244 Klass* k = java_lang_Class::as_Klass(r);
2245 assert(k->is_instance_klass(), "must be an instance klass");
2246 if (!k->is_instance_klass()) return false;
2247
2248 ResourceMark rm(THREAD);
2249 const char* name = k->name()->as_C_string();
2250 bool system_class = k->class_loader() == NULL;
2251 return JavaAssertions::enabled(name, system_class);
2252
2253 JVM_END
2254
2255
2256 // Return a new AssertionStatusDirectives object with the fields filled in with
2257 // command-line assertion arguments (i.e., -ea, -da).
2258 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2259 JVMWrapper("JVM_AssertionStatusDirectives");
2260 JvmtiVMObjectAllocEventCollector oam;
2261 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2262 return JNIHandles::make_local(env, asd);
2263 JVM_END
2264
2265 // Arrays support /////////////////////////////////////////////////////////////
2266
2267 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2268 JVMWrapper("JVM_ArrayIsAccessAtomic");
2269 oop o = JNIHandles::resolve(array);
2270 Klass* k = o->klass();
2271 if ((o == NULL) || (!k->is_array_klass())) {
2272 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2273 }
2274 if (k->is_valueArray_klass()) {
2275 return ValueArrayKlass::cast(k)->is_atomic();
2276 }
2277 return true;
2278 JVM_END
2279
2280 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2281 JVMWrapper("JVM_ArrayEnsureAccessAtomic");
2282 oop o = JNIHandles::resolve(array);
2283 Klass* k = o->klass();
2284 if ((o == NULL) || (!k->is_array_klass())) {
2285 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2286 }
2287 if (k->is_valueArray_klass()) {
2288 ValueArrayKlass* vk = ValueArrayKlass::cast(k);
2289 if (!vk->is_atomic()) {
2290 /**
2291 * Need to decide how to implement:
2292 *
2293 * 1) Change to objArrayOop layout, therefore oop->klass() differs so
2294 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through
2295 * "checkcast" & "instanceof"
2296 *
2297 * 2) Use extra header in the valueArrayOop to flag atomicity required and
2298 * possibly per instance lock structure. Said info, could be placed in
2299 * "trailer" rather than disturb the current arrayOop
2300 */
2301 Unimplemented();
2302 }
2303 }
2304 return array;
2305 JVM_END
2306
2307 // Verification ////////////////////////////////////////////////////////////////////////////////
2308
2309 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2310
2311 // RedefineClasses support: bug 6214132 caused verification to fail.
2312 // All functions from this section should call the jvmtiThreadSate function:
2313 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2314 // The function returns a Klass* of the _scratch_class if the verifier
2315 // was invoked in the middle of the class redefinition.
2316 // Otherwise it returns its argument value which is the _the_class Klass*.
2317 // Please, refer to the description in the jvmtiThreadSate.hpp.
2318
2319 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2320 JVMWrapper("JVM_GetClassNameUTF");
2321 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2322 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2323 return k->name()->as_utf8();
2324 JVM_END
2325
2326
2327 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2328 JVMWrapper("JVM_GetClassCPTypes");
2329 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2330 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2331 // types will have length zero if this is not an InstanceKlass
2332 // (length is determined by call to JVM_GetClassCPEntriesCount)
2333 if (k->is_instance_klass()) {
2334 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2335 for (int index = cp->length() - 1; index >= 0; index--) {
2336 constantTag tag = cp->tag_at(index);
2337 types[index] = tag.is_unresolved_klass() ? JVM_CONSTANT_Class : tag.value();
2338 }
2339 }
2340 JVM_END
2341
2342
2343 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2344 JVMWrapper("JVM_GetClassCPEntriesCount");
2345 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2346 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2347 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2348 JVM_END
2349
2350
2351 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2352 JVMWrapper("JVM_GetClassFieldsCount");
2353 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2354 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2355 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2356 JVM_END
2357
2358
2359 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2360 JVMWrapper("JVM_GetClassMethodsCount");
2361 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2362 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2363 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2364 JVM_END
2365
2366
2367 // The following methods, used for the verifier, are never called with
2368 // array klasses, so a direct cast to InstanceKlass is safe.
2369 // Typically, these methods are called in a loop with bounds determined
2370 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2371 // zero for arrays.
2372 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2373 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2374 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2375 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2376 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2377 int length = method->checked_exceptions_length();
2378 if (length > 0) {
2379 CheckedExceptionElement* table= method->checked_exceptions_start();
2380 for (int i = 0; i < length; i++) {
2381 exceptions[i] = table[i].class_cp_index;
2382 }
2383 }
2384 JVM_END
2385
2386
2387 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2388 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2389 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2390 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2391 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2392 return method->checked_exceptions_length();
2393 JVM_END
2394
2395
2396 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2397 JVMWrapper("JVM_GetMethodIxByteCode");
2398 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2399 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2400 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2401 memcpy(code, method->code_base(), method->code_size());
2402 JVM_END
2403
2404
2405 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2406 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2407 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2408 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2409 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2410 return method->code_size();
2411 JVM_END
2412
2413
2414 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2415 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2416 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2417 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2418 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2419 ExceptionTable extable(method);
2420 entry->start_pc = extable.start_pc(entry_index);
2421 entry->end_pc = extable.end_pc(entry_index);
2422 entry->handler_pc = extable.handler_pc(entry_index);
2423 entry->catchType = extable.catch_type_index(entry_index);
2424 JVM_END
2425
2426
2427 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2428 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2429 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2430 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2431 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2432 return method->exception_table_length();
2433 JVM_END
2434
2435
2436 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2437 JVMWrapper("JVM_GetMethodIxModifiers");
2438 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2439 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2440 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2441 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2442 JVM_END
2443
2444
2445 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2446 JVMWrapper("JVM_GetFieldIxModifiers");
2447 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2448 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2449 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2450 JVM_END
2451
2452
2453 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2454 JVMWrapper("JVM_GetMethodIxLocalsCount");
2455 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2456 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2457 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2458 return method->max_locals();
2459 JVM_END
2460
2461
2462 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2463 JVMWrapper("JVM_GetMethodIxArgsSize");
2464 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2465 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2466 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2467 return method->size_of_parameters();
2468 JVM_END
2469
2470
2471 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2472 JVMWrapper("JVM_GetMethodIxMaxStack");
2473 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2474 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2475 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2476 return method->verifier_max_stack();
2477 JVM_END
2478
2479
2480 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2481 JVMWrapper("JVM_IsConstructorIx");
2482 ResourceMark rm(THREAD);
2483 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2484 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2485 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2486 return method->name() == vmSymbols::object_initializer_name();
2487 JVM_END
2488
2489
2490 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2491 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2492 ResourceMark rm(THREAD);
2493 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2494 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2495 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2496 return method->is_overpass();
2497 JVM_END
2498
2499 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2500 JVMWrapper("JVM_GetMethodIxIxUTF");
2501 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2502 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2503 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2504 return method->name()->as_utf8();
2505 JVM_END
2506
2507
2508 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2509 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2510 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2511 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2512 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2513 return method->signature()->as_utf8();
2514 JVM_END
2515
2516 /**
2517 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2518 * read entries in the constant pool. Since the old verifier always
2519 * works on a copy of the code, it will not see any rewriting that
2520 * may possibly occur in the middle of verification. So it is important
2521 * that nothing it calls tries to use the cpCache instead of the raw
2522 * constant pool, so we must use cp->uncached_x methods when appropriate.
2523 */
2524 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2525 JVMWrapper("JVM_GetCPFieldNameUTF");
2526 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2527 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2528 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2529 switch (cp->tag_at(cp_index).value()) {
2530 case JVM_CONSTANT_Fieldref:
2531 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2532 default:
2533 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2534 }
2535 ShouldNotReachHere();
2536 return NULL;
2537 JVM_END
2538
2539
2540 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2541 JVMWrapper("JVM_GetCPMethodNameUTF");
2542 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2543 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2544 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2545 switch (cp->tag_at(cp_index).value()) {
2546 case JVM_CONSTANT_InterfaceMethodref:
2547 case JVM_CONSTANT_Methodref:
2548 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2549 default:
2550 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2551 }
2552 ShouldNotReachHere();
2553 return NULL;
2554 JVM_END
2555
2556
2557 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2558 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2559 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2560 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2561 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2562 switch (cp->tag_at(cp_index).value()) {
2563 case JVM_CONSTANT_InterfaceMethodref:
2564 case JVM_CONSTANT_Methodref:
2565 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2566 default:
2567 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2568 }
2569 ShouldNotReachHere();
2570 return NULL;
2571 JVM_END
2572
2573
2574 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2575 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2576 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2577 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2578 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2579 switch (cp->tag_at(cp_index).value()) {
2580 case JVM_CONSTANT_Fieldref:
2581 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2582 default:
2583 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2584 }
2585 ShouldNotReachHere();
2586 return NULL;
2587 JVM_END
2588
2589
2590 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2591 JVMWrapper("JVM_GetCPClassNameUTF");
2592 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2593 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2594 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2595 Symbol* classname = cp->klass_name_at(cp_index);
2596 return classname->as_utf8();
2597 JVM_END
2598
2599
2600 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2601 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2603 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2604 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2605 switch (cp->tag_at(cp_index).value()) {
2606 case JVM_CONSTANT_Fieldref: {
2607 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2608 Symbol* classname = cp->klass_name_at(class_index);
2609 return classname->as_utf8();
2610 }
2611 default:
2612 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2613 }
2614 ShouldNotReachHere();
2615 return NULL;
2616 JVM_END
2617
2618
2619 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2620 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2621 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2622 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2623 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2624 switch (cp->tag_at(cp_index).value()) {
2625 case JVM_CONSTANT_Methodref:
2626 case JVM_CONSTANT_InterfaceMethodref: {
2627 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2628 Symbol* classname = cp->klass_name_at(class_index);
2629 return classname->as_utf8();
2630 }
2631 default:
2632 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2633 }
2634 ShouldNotReachHere();
2635 return NULL;
2636 JVM_END
2637
2638
2639 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2640 JVMWrapper("JVM_GetCPFieldModifiers");
2641 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2642 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2643 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2644 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2645 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2646 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2647 switch (cp->tag_at(cp_index).value()) {
2648 case JVM_CONSTANT_Fieldref: {
2649 Symbol* name = cp->uncached_name_ref_at(cp_index);
2650 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2651 InstanceKlass* ik = InstanceKlass::cast(k_called);
2652 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2653 if (fs.name() == name && fs.signature() == signature) {
2654 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2655 }
2656 }
2657 return -1;
2658 }
2659 default:
2660 fatal("JVM_GetCPFieldModifiers: illegal constant");
2661 }
2662 ShouldNotReachHere();
2663 return 0;
2664 JVM_END
2665
2666
2667 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2668 JVMWrapper("JVM_GetCPMethodModifiers");
2669 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2670 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2671 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2672 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2673 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2674 switch (cp->tag_at(cp_index).value()) {
2675 case JVM_CONSTANT_Methodref:
2676 case JVM_CONSTANT_InterfaceMethodref: {
2677 Symbol* name = cp->uncached_name_ref_at(cp_index);
2678 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2679 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2680 int methods_count = methods->length();
2681 for (int i = 0; i < methods_count; i++) {
2682 Method* method = methods->at(i);
2683 if (method->name() == name && method->signature() == signature) {
2684 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2685 }
2686 }
2687 return -1;
2688 }
2689 default:
2690 fatal("JVM_GetCPMethodModifiers: illegal constant");
2691 }
2692 ShouldNotReachHere();
2693 return 0;
2694 JVM_END
2695
2696
2697 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2698
2699 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2700 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2701 JVM_END
2702
2703
2704 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2705 JVMWrapper("JVM_IsSameClassPackage");
2706 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2707 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2708 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2709 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2710 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2711 JVM_END
2712
2713 // Printing support //////////////////////////////////////////////////
2714 extern "C" {
2715
2716 ATTRIBUTE_PRINTF(3, 0)
2717 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2718 // Reject count values that are negative signed values converted to
2719 // unsigned; see bug 4399518, 4417214
2720 if ((intptr_t)count <= 0) return -1;
2721
2722 int result = os::vsnprintf(str, count, fmt, args);
2723 if (result > 0 && (size_t)result >= count) {
2724 result = -1;
2725 }
2726
2727 return result;
2728 }
2729
2730 ATTRIBUTE_PRINTF(3, 4)
2731 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2732 va_list args;
2733 int len;
2734 va_start(args, fmt);
2735 len = jio_vsnprintf(str, count, fmt, args);
2736 va_end(args);
2737 return len;
2738 }
2739
2740 ATTRIBUTE_PRINTF(2, 3)
2741 int jio_fprintf(FILE* f, const char *fmt, ...) {
2742 int len;
2743 va_list args;
2744 va_start(args, fmt);
2745 len = jio_vfprintf(f, fmt, args);
2746 va_end(args);
2747 return len;
2748 }
2749
2750 ATTRIBUTE_PRINTF(2, 0)
2751 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2752 if (Arguments::vfprintf_hook() != NULL) {
2753 return Arguments::vfprintf_hook()(f, fmt, args);
2754 } else {
2755 return vfprintf(f, fmt, args);
2756 }
2757 }
2758
2759 ATTRIBUTE_PRINTF(1, 2)
2760 JNIEXPORT int jio_printf(const char *fmt, ...) {
2761 int len;
2762 va_list args;
2763 va_start(args, fmt);
2764 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2765 va_end(args);
2766 return len;
2767 }
2768
2769
2770 // HotSpot specific jio method
2771 void jio_print(const char* s) {
2772 // Try to make this function as atomic as possible.
2773 if (Arguments::vfprintf_hook() != NULL) {
2774 jio_fprintf(defaultStream::output_stream(), "%s", s);
2775 } else {
2776 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2777 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2778 }
2779 }
2780
2781 } // Extern C
2782
2783 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2784
2785 // In most of the JVM thread support functions we need to access the
2786 // thread through a ThreadsListHandle to prevent it from exiting and
2787 // being reclaimed while we try to operate on it. The exceptions to this
2788 // rule are when operating on the current thread, or if the monitor of
2789 // the target java.lang.Thread is locked at the Java level - in both
2790 // cases the target cannot exit.
2791
2792 static void thread_entry(JavaThread* thread, TRAPS) {
2793 HandleMark hm(THREAD);
2794 Handle obj(THREAD, thread->threadObj());
2795 JavaValue result(T_VOID);
2796 JavaCalls::call_virtual(&result,
2797 obj,
2798 SystemDictionary::Thread_klass(),
2799 vmSymbols::run_method_name(),
2800 vmSymbols::void_method_signature(),
2801 THREAD);
2802 }
2803
2804
2805 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2806 JVMWrapper("JVM_StartThread");
2807 JavaThread *native_thread = NULL;
2808
2809 // We cannot hold the Threads_lock when we throw an exception,
2810 // due to rank ordering issues. Example: we might need to grab the
2811 // Heap_lock while we construct the exception.
2812 bool throw_illegal_thread_state = false;
2813
2814 // We must release the Threads_lock before we can post a jvmti event
2815 // in Thread::start.
2816 {
2817 // Ensure that the C++ Thread and OSThread structures aren't freed before
2818 // we operate.
2819 MutexLocker mu(Threads_lock);
2820
2821 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2822 // re-starting an already started thread, so we should usually find
2823 // that the JavaThread is null. However for a JNI attached thread
2824 // there is a small window between the Thread object being created
2825 // (with its JavaThread set) and the update to its threadStatus, so we
2826 // have to check for this
2827 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2828 throw_illegal_thread_state = true;
2829 } else {
2830 // We could also check the stillborn flag to see if this thread was already stopped, but
2831 // for historical reasons we let the thread detect that itself when it starts running
2832
2833 jlong size =
2834 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2835 // Allocate the C++ Thread structure and create the native thread. The
2836 // stack size retrieved from java is 64-bit signed, but the constructor takes
2837 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2838 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2839 // - Avoid passing negative values which would result in really large stacks.
2840 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2841 size_t sz = size > 0 ? (size_t) size : 0;
2842 native_thread = new JavaThread(&thread_entry, sz);
2843
2844 // At this point it may be possible that no osthread was created for the
2845 // JavaThread due to lack of memory. Check for this situation and throw
2846 // an exception if necessary. Eventually we may want to change this so
2847 // that we only grab the lock if the thread was created successfully -
2848 // then we can also do this check and throw the exception in the
2849 // JavaThread constructor.
2850 if (native_thread->osthread() != NULL) {
2851 // Note: the current thread is not being used within "prepare".
2852 native_thread->prepare(jthread);
2853 }
2854 }
2855 }
2856
2857 if (throw_illegal_thread_state) {
2858 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2859 }
2860
2861 assert(native_thread != NULL, "Starting null thread?");
2862
2863 if (native_thread->osthread() == NULL) {
2864 // No one should hold a reference to the 'native_thread'.
2865 native_thread->smr_delete();
2866 if (JvmtiExport::should_post_resource_exhausted()) {
2867 JvmtiExport::post_resource_exhausted(
2868 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2869 os::native_thread_creation_failed_msg());
2870 }
2871 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2872 os::native_thread_creation_failed_msg());
2873 }
2874
2875 Thread::start(native_thread);
2876
2877 JVM_END
2878
2879
2880 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2881 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2882 // but is thought to be reliable and simple. In the case, where the receiver is the
2883 // same thread as the sender, no VM_Operation is needed.
2884 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2885 JVMWrapper("JVM_StopThread");
2886
2887 // A nested ThreadsListHandle will grab the Threads_lock so create
2888 // tlh before we resolve throwable.
2889 ThreadsListHandle tlh(thread);
2890 oop java_throwable = JNIHandles::resolve(throwable);
2891 if (java_throwable == NULL) {
2892 THROW(vmSymbols::java_lang_NullPointerException());
2893 }
2894 oop java_thread = NULL;
2895 JavaThread* receiver = NULL;
2896 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2897 Events::log_exception(thread,
2898 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2899 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2900
2901 if (is_alive) {
2902 // jthread refers to a live JavaThread.
2903 if (thread == receiver) {
2904 // Exception is getting thrown at self so no VM_Operation needed.
2905 THROW_OOP(java_throwable);
2906 } else {
2907 // Use a VM_Operation to throw the exception.
2908 Thread::send_async_exception(java_thread, java_throwable);
2909 }
2910 } else {
2911 // Either:
2912 // - target thread has not been started before being stopped, or
2913 // - target thread already terminated
2914 // We could read the threadStatus to determine which case it is
2915 // but that is overkill as it doesn't matter. We must set the
2916 // stillborn flag for the first case, and if the thread has already
2917 // exited setting this flag has no effect.
2918 java_lang_Thread::set_stillborn(java_thread);
2919 }
2920 JVM_END
2921
2922
2923 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2924 JVMWrapper("JVM_IsThreadAlive");
2925
2926 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2927 return java_lang_Thread::is_alive(thread_oop);
2928 JVM_END
2929
2930
2931 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2932 JVMWrapper("JVM_SuspendThread");
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 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2941 if (receiver->is_external_suspend()) {
2942 // Don't allow nested external suspend requests. We can't return
2943 // an error from this interface so just ignore the problem.
2944 return;
2945 }
2946 if (receiver->is_exiting()) { // thread is in the process of exiting
2947 return;
2948 }
2949 receiver->set_external_suspend();
2950 }
2951
2952 // java_suspend() will catch threads in the process of exiting
2953 // and will ignore them.
2954 receiver->java_suspend();
2955
2956 // It would be nice to have the following assertion in all the
2957 // time, but it is possible for a racing resume request to have
2958 // resumed this thread right after we suspended it. Temporarily
2959 // enable this assertion if you are chasing a different kind of
2960 // bug.
2961 //
2962 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2963 // receiver->is_being_ext_suspended(), "thread is not suspended");
2964 }
2965 JVM_END
2966
2967
2968 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2969 JVMWrapper("JVM_ResumeThread");
2970
2971 ThreadsListHandle tlh(thread);
2972 JavaThread* receiver = NULL;
2973 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2974 if (is_alive) {
2975 // jthread refers to a live JavaThread.
2976
2977 // This is the original comment for this Threads_lock grab:
2978 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2979 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2980 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2981 // looks at it.
2982 //
2983 // The above comment dates back to when we had both internal and
2984 // external suspend APIs that shared a common underlying mechanism.
2985 // External suspend is now entirely cooperative and doesn't share
2986 // anything with internal suspend. That said, there are some
2987 // assumptions in the VM that an external resume grabs the
2988 // Threads_lock. We can't drop the Threads_lock grab here until we
2989 // resolve the assumptions that exist elsewhere.
2990 //
2991 MutexLocker ml(Threads_lock);
2992 receiver->java_resume();
2993 }
2994 JVM_END
2995
2996
2997 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2998 JVMWrapper("JVM_SetThreadPriority");
2999
3000 ThreadsListHandle tlh(thread);
3001 oop java_thread = NULL;
3002 JavaThread* receiver = NULL;
3003 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3004 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3005
3006 if (is_alive) {
3007 // jthread refers to a live JavaThread.
3008 Thread::set_priority(receiver, (ThreadPriority)prio);
3009 }
3010 // Implied else: If the JavaThread hasn't started yet, then the
3011 // priority set in the java.lang.Thread object above will be pushed
3012 // down when it does start.
3013 JVM_END
3014
3015
3016 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3017 JVMWrapper("JVM_Yield");
3018 if (os::dont_yield()) return;
3019 HOTSPOT_THREAD_YIELD();
3020 os::naked_yield();
3021 JVM_END
3022
3023
3024 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3025 JVMWrapper("JVM_Sleep");
3026
3027 if (millis < 0) {
3028 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3029 }
3030
3031 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3032 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3033 }
3034
3035 // Save current thread state and restore it at the end of this block.
3036 // And set new thread state to SLEEPING.
3037 JavaThreadSleepState jtss(thread);
3038
3039 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3040
3041 EventThreadSleep event;
3042
3043 if (millis == 0) {
3044 os::naked_yield();
3045 } else {
3046 ThreadState old_state = thread->osthread()->get_state();
3047 thread->osthread()->set_state(SLEEPING);
3048 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3049 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3050 // us while we were sleeping. We do not overwrite those.
3051 if (!HAS_PENDING_EXCEPTION) {
3052 if (event.should_commit()) {
3053 event.set_time(millis);
3054 event.commit();
3055 }
3056 HOTSPOT_THREAD_SLEEP_END(1);
3057
3058 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3059 // to properly restore the thread state. That's likely wrong.
3060 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3061 }
3062 }
3063 thread->osthread()->set_state(old_state);
3064 }
3065 if (event.should_commit()) {
3066 event.set_time(millis);
3067 event.commit();
3068 }
3069 HOTSPOT_THREAD_SLEEP_END(0);
3070 JVM_END
3071
3072 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3073 JVMWrapper("JVM_CurrentThread");
3074 oop jthread = thread->threadObj();
3075 assert (thread != NULL, "no current thread!");
3076 return JNIHandles::make_local(env, jthread);
3077 JVM_END
3078
3079
3080 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3081 JVMWrapper("JVM_CountStackFrames");
3082
3083 uint32_t debug_bits = 0;
3084 ThreadsListHandle tlh(thread);
3085 JavaThread* receiver = NULL;
3086 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3087 int count = 0;
3088 if (is_alive) {
3089 // jthread refers to a live JavaThread.
3090 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
3091 // Count all java activation, i.e., number of vframes.
3092 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) {
3093 // Native frames are not counted.
3094 if (!vfst.method()->is_native()) count++;
3095 }
3096 } else {
3097 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3098 "this thread is not suspended");
3099 }
3100 }
3101 // Implied else: if JavaThread is not alive simply return a count of 0.
3102
3103 return count;
3104 JVM_END
3105
3106
3107 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3108 JVMWrapper("JVM_Interrupt");
3109
3110 ThreadsListHandle tlh(thread);
3111 JavaThread* receiver = NULL;
3112 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3113 if (is_alive) {
3114 // jthread refers to a live JavaThread.
3115 Thread::interrupt(receiver);
3116 }
3117 JVM_END
3118
3119
3120 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3121 JVMWrapper("JVM_IsInterrupted");
3122
3123 ThreadsListHandle tlh(thread);
3124 JavaThread* receiver = NULL;
3125 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3126 if (is_alive) {
3127 // jthread refers to a live JavaThread.
3128 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3129 } else {
3130 return JNI_FALSE;
3131 }
3132 JVM_END
3133
3134
3135 // Return true iff the current thread has locked the object passed in
3136
3137 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3138 JVMWrapper("JVM_HoldsLock");
3139 assert(THREAD->is_Java_thread(), "sanity check");
3140 if (obj == NULL) {
3141 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3142 }
3143 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3144 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3145 JVM_END
3146
3147
3148 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3149 JVMWrapper("JVM_DumpAllStacks");
3150 VM_PrintThreads op;
3151 VMThread::execute(&op);
3152 if (JvmtiExport::should_post_data_dump()) {
3153 JvmtiExport::post_data_dump();
3154 }
3155 JVM_END
3156
3157 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3158 JVMWrapper("JVM_SetNativeThreadName");
3159
3160 // We don't use a ThreadsListHandle here because the current thread
3161 // must be alive.
3162 oop java_thread = JNIHandles::resolve_non_null(jthread);
3163 JavaThread* thr = java_lang_Thread::thread(java_thread);
3164 if (thread == thr && !thr->has_attached_via_jni()) {
3165 // Thread naming is only supported for the current thread and
3166 // we don't set the name of an attached thread to avoid stepping
3167 // on other programs.
3168 ResourceMark rm(thread);
3169 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3170 os::set_native_thread_name(thread_name);
3171 }
3172 JVM_END
3173
3174 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3175
3176 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3177 JVMWrapper("JVM_GetClassContext");
3178 ResourceMark rm(THREAD);
3179 JvmtiVMObjectAllocEventCollector oam;
3180 vframeStream vfst(thread);
3181
3182 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3183 // This must only be called from SecurityManager.getClassContext
3184 Method* m = vfst.method();
3185 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3186 m->name() == vmSymbols::getClassContext_name() &&
3187 m->signature() == vmSymbols::void_class_array_signature())) {
3188 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3189 }
3190 }
3191
3192 // Collect method holders
3193 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3194 for (; !vfst.at_end(); vfst.security_next()) {
3195 Method* m = vfst.method();
3196 // Native frames are not returned
3197 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3198 Klass* holder = m->method_holder();
3199 assert(holder->is_klass(), "just checking");
3200 klass_array->append(holder);
3201 }
3202 }
3203
3204 // Create result array of type [Ljava/lang/Class;
3205 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3206 // Fill in mirrors corresponding to method holders
3207 for (int i = 0; i < klass_array->length(); i++) {
3208 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3209 }
3210
3211 return (jobjectArray) JNIHandles::make_local(env, result);
3212 JVM_END
3213
3214
3215 // java.lang.Package ////////////////////////////////////////////////////////////////
3216
3217
3218 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3219 JVMWrapper("JVM_GetSystemPackage");
3220 ResourceMark rm(THREAD);
3221 JvmtiVMObjectAllocEventCollector oam;
3222 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3223 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3224 return (jstring) JNIHandles::make_local(result);
3225 JVM_END
3226
3227
3228 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3229 JVMWrapper("JVM_GetSystemPackages");
3230 JvmtiVMObjectAllocEventCollector oam;
3231 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3232 return (jobjectArray) JNIHandles::make_local(result);
3233 JVM_END
3234
3235
3236 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3237
3238
3239 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3240 JVMWrapper("JVM_GetAndClearReferencePendingList");
3241
3242 MonitorLockerEx ml(Heap_lock);
3243 oop ref = Universe::reference_pending_list();
3244 if (ref != NULL) {
3245 Universe::set_reference_pending_list(NULL);
3246 }
3247 return JNIHandles::make_local(env, ref);
3248 JVM_END
3249
3250 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3251 JVMWrapper("JVM_HasReferencePendingList");
3252 MonitorLockerEx ml(Heap_lock);
3253 return Universe::has_reference_pending_list();
3254 JVM_END
3255
3256 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3257 JVMWrapper("JVM_WaitForReferencePendingList");
3258 MonitorLockerEx ml(Heap_lock);
3259 while (!Universe::has_reference_pending_list()) {
3260 ml.wait();
3261 }
3262 JVM_END
3263
3264
3265 // ObjectInputStream ///////////////////////////////////////////////////////////////
3266
3267 // Return the first user-defined class loader up the execution stack, or null
3268 // if only code from the bootstrap or platform class loader is on the stack.
3269
3270 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3271 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3272 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3273 oop loader = vfst.method()->method_holder()->class_loader();
3274 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3275 return JNIHandles::make_local(env, loader);
3276 }
3277 }
3278 return NULL;
3279 JVM_END
3280
3281
3282 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3283
3284
3285 // resolve array handle and check arguments
3286 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3287 if (arr == NULL) {
3288 THROW_0(vmSymbols::java_lang_NullPointerException());
3289 }
3290 oop a = JNIHandles::resolve_non_null(arr);
3291 if (!a->is_array()) {
3292 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3293 } else if (type_array_only && !a->is_typeArray()) {
3294 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3295 }
3296 return arrayOop(a);
3297 }
3298
3299
3300 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3301 JVMWrapper("JVM_GetArrayLength");
3302 arrayOop a = check_array(env, arr, false, CHECK_0);
3303 return a->length();
3304 JVM_END
3305
3306
3307 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3308 JVMWrapper("JVM_Array_Get");
3309 JvmtiVMObjectAllocEventCollector oam;
3310 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3311 jvalue value;
3312 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3313 oop box = Reflection::box(&value, type, CHECK_NULL);
3314 return JNIHandles::make_local(env, box);
3315 JVM_END
3316
3317
3318 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3319 JVMWrapper("JVM_GetPrimitiveArrayElement");
3320 jvalue value;
3321 value.i = 0; // to initialize value before getting used in CHECK
3322 arrayOop a = check_array(env, arr, true, CHECK_(value));
3323 assert(a->is_typeArray(), "just checking");
3324 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3325 BasicType wide_type = (BasicType) wCode;
3326 if (type != wide_type) {
3327 Reflection::widen(&value, type, wide_type, CHECK_(value));
3328 }
3329 return value;
3330 JVM_END
3331
3332
3333 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3334 JVMWrapper("JVM_SetArrayElement");
3335 arrayOop a = check_array(env, arr, false, CHECK);
3336 oop box = JNIHandles::resolve(val);
3337 jvalue value;
3338 value.i = 0; // to initialize value before getting used in CHECK
3339 BasicType value_type;
3340 if (a->is_objArray()) {
3341 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3342 value_type = Reflection::unbox_for_regular_object(box, &value);
3343 } else {
3344 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3345 }
3346 Reflection::array_set(&value, a, index, value_type, CHECK);
3347 JVM_END
3348
3349
3350 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3351 JVMWrapper("JVM_SetPrimitiveArrayElement");
3352 arrayOop a = check_array(env, arr, true, CHECK);
3353 assert(a->is_typeArray(), "just checking");
3354 BasicType value_type = (BasicType) vCode;
3355 Reflection::array_set(&v, a, index, value_type, CHECK);
3356 JVM_END
3357
3358
3359 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3360 JVMWrapper("JVM_NewArray");
3361 JvmtiVMObjectAllocEventCollector oam;
3362 oop element_mirror = JNIHandles::resolve(eltClass);
3363 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3364 return JNIHandles::make_local(env, result);
3365 JVM_END
3366
3367
3368 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3369 JVMWrapper("JVM_NewMultiArray");
3370 JvmtiVMObjectAllocEventCollector oam;
3371 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3372 oop element_mirror = JNIHandles::resolve(eltClass);
3373 assert(dim_array->is_typeArray(), "just checking");
3374 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3375 return JNIHandles::make_local(env, result);
3376 JVM_END
3377
3378
3379 // Library support ///////////////////////////////////////////////////////////////////////////
3380
3381 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3382 //%note jvm_ct
3383 JVMWrapper("JVM_LoadLibrary");
3384 char ebuf[1024];
3385 void *load_result;
3386 {
3387 ThreadToNativeFromVM ttnfvm(thread);
3388 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3389 }
3390 if (load_result == NULL) {
3391 char msg[1024];
3392 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3393 // Since 'ebuf' may contain a string encoded using
3394 // platform encoding scheme, we need to pass
3395 // Exceptions::unsafe_to_utf8 to the new_exception method
3396 // as the last argument. See bug 6367357.
3397 Handle h_exception =
3398 Exceptions::new_exception(thread,
3399 vmSymbols::java_lang_UnsatisfiedLinkError(),
3400 msg, Exceptions::unsafe_to_utf8);
3401
3402 THROW_HANDLE_0(h_exception);
3403 }
3404 return load_result;
3405 JVM_END
3406
3407
3408 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3409 JVMWrapper("JVM_UnloadLibrary");
3410 os::dll_unload(handle);
3411 JVM_END
3412
3413
3414 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3415 JVMWrapper("JVM_FindLibraryEntry");
3416 return os::dll_lookup(handle, name);
3417 JVM_END
3418
3419
3420 // JNI version ///////////////////////////////////////////////////////////////////////////////
3421
3422 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3423 JVMWrapper("JVM_IsSupportedJNIVersion");
3424 return Threads::is_supported_jni_version_including_1_1(version);
3425 JVM_END
3426
3427
3428 // String support ///////////////////////////////////////////////////////////////////////////
3429
3430 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3431 JVMWrapper("JVM_InternString");
3432 JvmtiVMObjectAllocEventCollector oam;
3433 if (str == NULL) return NULL;
3434 oop string = JNIHandles::resolve_non_null(str);
3435 oop result = StringTable::intern(string, CHECK_NULL);
3436 return (jstring) JNIHandles::make_local(env, result);
3437 JVM_END
3438
3439
3440 // Raw monitor support //////////////////////////////////////////////////////////////////////
3441
3442 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3443 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3444 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3445 // that only works with java threads.
3446
3447
3448 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3449 VM_Exit::block_if_vm_exited();
3450 JVMWrapper("JVM_RawMonitorCreate");
3451 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3452 }
3453
3454
3455 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3456 VM_Exit::block_if_vm_exited();
3457 JVMWrapper("JVM_RawMonitorDestroy");
3458 delete ((Mutex*) mon);
3459 }
3460
3461
3462 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3463 VM_Exit::block_if_vm_exited();
3464 JVMWrapper("JVM_RawMonitorEnter");
3465 ((Mutex*) mon)->jvm_raw_lock();
3466 return 0;
3467 }
3468
3469
3470 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3471 VM_Exit::block_if_vm_exited();
3472 JVMWrapper("JVM_RawMonitorExit");
3473 ((Mutex*) mon)->jvm_raw_unlock();
3474 }
3475
3476
3477 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3478
3479 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3480 Handle loader, Handle protection_domain,
3481 jboolean throwError, TRAPS) {
3482 // Security Note:
3483 // The Java level wrapper will perform the necessary security check allowing
3484 // us to pass the NULL as the initiating class loader. The VM is responsible for
3485 // the checkPackageAccess relative to the initiating class loader via the
3486 // protection_domain. The protection_domain is passed as NULL by the java code
3487 // if there is no security manager in 3-arg Class.forName().
3488 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3489
3490 // Check if we should initialize the class
3491 if (init && klass->is_instance_klass()) {
3492 klass->initialize(CHECK_NULL);
3493 }
3494 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3495 }
3496
3497
3498 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3499
3500 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3501 JVMWrapper("JVM_InvokeMethod");
3502 Handle method_handle;
3503 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3504 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3505 Handle receiver(THREAD, JNIHandles::resolve(obj));
3506 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3507 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3508 jobject res = JNIHandles::make_local(env, result);
3509 if (JvmtiExport::should_post_vm_object_alloc()) {
3510 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3511 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3512 if (java_lang_Class::is_primitive(ret_type)) {
3513 // Only for primitive type vm allocates memory for java object.
3514 // See box() method.
3515 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3516 }
3517 }
3518 return res;
3519 } else {
3520 THROW_0(vmSymbols::java_lang_StackOverflowError());
3521 }
3522 JVM_END
3523
3524
3525 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3526 JVMWrapper("JVM_NewInstanceFromConstructor");
3527 oop constructor_mirror = JNIHandles::resolve(c);
3528 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3529 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3530 jobject res = JNIHandles::make_local(env, result);
3531 if (JvmtiExport::should_post_vm_object_alloc()) {
3532 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3533 }
3534 return res;
3535 JVM_END
3536
3537 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3538
3539 JVM_LEAF(jboolean, JVM_SupportsCX8())
3540 JVMWrapper("JVM_SupportsCX8");
3541 return VM_Version::supports_cx8();
3542 JVM_END
3543
3544 // Returns an array of all live Thread objects (VM internal JavaThreads,
3545 // jvmti agent threads, and JNI attaching threads are skipped)
3546 // See CR 6404306 regarding JNI attaching threads
3547 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3548 ResourceMark rm(THREAD);
3549 ThreadsListEnumerator tle(THREAD, false, false);
3550 JvmtiVMObjectAllocEventCollector oam;
3551
3552 int num_threads = tle.num_threads();
3553 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3554 objArrayHandle threads_ah(THREAD, r);
3555
3556 for (int i = 0; i < num_threads; i++) {
3557 Handle h = tle.get_threadObj(i);
3558 threads_ah->obj_at_put(i, h());
3559 }
3560
3561 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3562 JVM_END
3563
3564
3565 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3566 // Return StackTraceElement[][], each element is the stack trace of a thread in
3567 // the corresponding entry in the given threads array
3568 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3569 JVMWrapper("JVM_DumpThreads");
3570 JvmtiVMObjectAllocEventCollector oam;
3571
3572 // Check if threads is null
3573 if (threads == NULL) {
3574 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3575 }
3576
3577 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3578 objArrayHandle ah(THREAD, a);
3579 int num_threads = ah->length();
3580 // check if threads is non-empty array
3581 if (num_threads == 0) {
3582 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3583 }
3584
3585 // check if threads is not an array of objects of Thread class
3586 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3587 if (k != SystemDictionary::Thread_klass()) {
3588 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3589 }
3590
3591 ResourceMark rm(THREAD);
3592
3593 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3594 for (int i = 0; i < num_threads; i++) {
3595 oop thread_obj = ah->obj_at(i);
3596 instanceHandle h(THREAD, (instanceOop) thread_obj);
3597 thread_handle_array->append(h);
3598 }
3599
3600 // The JavaThread references in thread_handle_array are validated
3601 // in VM_ThreadDump::doit().
3602 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3603 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3604
3605 JVM_END
3606
3607 // JVM monitoring and management support
3608 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3609 return Management::get_jmm_interface(version);
3610 JVM_END
3611
3612 // com.sun.tools.attach.VirtualMachine agent properties support
3613 //
3614 // Initialize the agent properties with the properties maintained in the VM
3615 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3616 JVMWrapper("JVM_InitAgentProperties");
3617 ResourceMark rm;
3618
3619 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3620
3621 PUTPROP(props, "sun.java.command", Arguments::java_command());
3622 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3623 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3624 return properties;
3625 JVM_END
3626
3627 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3628 {
3629 JVMWrapper("JVM_GetEnclosingMethodInfo");
3630 JvmtiVMObjectAllocEventCollector oam;
3631
3632 if (ofClass == NULL) {
3633 return NULL;
3634 }
3635 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3636 // Special handling for primitive objects
3637 if (java_lang_Class::is_primitive(mirror())) {
3638 return NULL;
3639 }
3640 Klass* k = java_lang_Class::as_Klass(mirror());
3641 if (!k->is_instance_klass()) {
3642 return NULL;
3643 }
3644 InstanceKlass* ik = InstanceKlass::cast(k);
3645 int encl_method_class_idx = ik->enclosing_method_class_index();
3646 if (encl_method_class_idx == 0) {
3647 return NULL;
3648 }
3649 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3650 objArrayHandle dest(THREAD, dest_o);
3651 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3652 dest->obj_at_put(0, enc_k->java_mirror());
3653 int encl_method_method_idx = ik->enclosing_method_method_index();
3654 if (encl_method_method_idx != 0) {
3655 Symbol* sym = ik->constants()->symbol_at(
3656 extract_low_short_from_int(
3657 ik->constants()->name_and_type_at(encl_method_method_idx)));
3658 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3659 dest->obj_at_put(1, str());
3660 sym = ik->constants()->symbol_at(
3661 extract_high_short_from_int(
3662 ik->constants()->name_and_type_at(encl_method_method_idx)));
3663 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3664 dest->obj_at_put(2, str());
3665 }
3666 return (jobjectArray) JNIHandles::make_local(dest());
3667 }
3668 JVM_END
3669
3670 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3671 {
3672 memset(info, 0, info_size);
3673
3674 info->jvm_version = Abstract_VM_Version::jvm_version();
3675 info->patch_version = Abstract_VM_Version::vm_patch_version();
3676
3677 // when we add a new capability in the jvm_version_info struct, we should also
3678 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3679 // counter defined in runtimeService.cpp.
3680 info->is_attach_supported = AttachListener::is_attach_supported();
3681 }
3682 JVM_END
3683
3684 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3685 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3686 ResourceMark rm(THREAD);
3687
3688 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3689 return NULL;
3690 }
3691
3692 char** vm_flags = Arguments::jvm_flags_array();
3693 char** vm_args = Arguments::jvm_args_array();
3694 int num_flags = Arguments::num_jvm_flags();
3695 int num_args = Arguments::num_jvm_args();
3696
3697 InstanceKlass* ik = SystemDictionary::String_klass();
3698 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3699 objArrayHandle result_h(THREAD, r);
3700
3701 int index = 0;
3702 for (int j = 0; j < num_flags; j++, index++) {
3703 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3704 result_h->obj_at_put(index, h());
3705 }
3706 for (int i = 0; i < num_args; i++, index++) {
3707 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3708 result_h->obj_at_put(index, h());
3709 }
3710 return (jobjectArray) JNIHandles::make_local(env, result_h());
3711 JVM_END
3712
3713 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3714 return os::get_signal_number(name);
3715 JVM_END