1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/modules.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/stringTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "gc/shared/collectedHeap.inline.hpp"
39 #include "interpreter/bytecode.hpp"
40 #include "jfr/jfrEvents.hpp"
41 #include "logging/log.hpp"
42 #include "memory/heapShared.hpp"
43 #include "memory/oopFactory.hpp"
44 #include "memory/referenceType.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "memory/universe.hpp"
47 #include "oops/access.inline.hpp"
48 #include "oops/constantPool.hpp"
49 #include "oops/fieldStreams.hpp"
50 #include "oops/instanceKlass.hpp"
51 #include "oops/method.hpp"
52 #include "oops/objArrayKlass.hpp"
53 #include "oops/objArrayOop.inline.hpp"
54 #include "oops/oop.inline.hpp"
55 #include "prims/jvm_misc.hpp"
56 #include "prims/jvmtiExport.hpp"
57 #include "prims/jvmtiThreadState.hpp"
58 #include "prims/nativeLookup.hpp"
59 #include "prims/stackwalk.hpp"
60 #include "runtime/arguments.hpp"
61 #include "runtime/atomic.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/init.hpp"
64 #include "runtime/interfaceSupport.inline.hpp"
65 #include "runtime/deoptimization.hpp"
66 #include "runtime/java.hpp"
67 #include "runtime/javaCalls.hpp"
68 #include "runtime/jfieldIDWorkaround.hpp"
69 #include "runtime/jniHandles.inline.hpp"
70 #include "runtime/orderAccess.hpp"
71 #include "runtime/os.inline.hpp"
72 #include "runtime/perfData.hpp"
73 #include "runtime/reflection.hpp"
74 #include "runtime/synchronizer.hpp"
75 #include "runtime/thread.inline.hpp"
76 #include "runtime/threadSMR.hpp"
77 #include "runtime/vframe.inline.hpp"
78 #include "runtime/vmOperations.hpp"
79 #include "runtime/vm_version.hpp"
80 #include "services/attachListener.hpp"
81 #include "services/management.hpp"
82 #include "services/threadService.hpp"
83 #include "utilities/copy.hpp"
84 #include "utilities/defaultStream.hpp"
85 #include "utilities/dtrace.hpp"
86 #include "utilities/events.hpp"
87 #include "utilities/histogram.hpp"
88 #include "utilities/macros.hpp"
89 #include "utilities/utf8.hpp"
90 #if INCLUDE_CDS
91 #include "classfile/systemDictionaryShared.hpp"
92 #endif
93
94 #include <errno.h>
95
96 /*
97 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
98 such ctors and calls MUST NOT come between an oop declaration/init and its
99 usage because if objects are move this may cause various memory stomps, bus
100 errors and segfaults. Here is a cookbook for causing so called "naked oop
101 failures":
102
103 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
104 JVMWrapper("JVM_GetClassDeclaredFields");
105
106 // Object address to be held directly in mirror & not visible to GC
107 oop mirror = JNIHandles::resolve_non_null(ofClass);
108
109 // If this ctor can hit a safepoint, moving objects around, then
110 ComplexConstructor foo;
111
112 // Boom! mirror may point to JUNK instead of the intended object
113 (some dereference of mirror)
114
115 // Here's another call that may block for GC, making mirror stale
116 MutexLocker ml(some_lock);
117
118 // And here's an initializer that can result in a stale oop
119 // all in one step.
120 oop o = call_that_can_throw_exception(TRAPS);
121
122
123 The solution is to keep the oop declaration BELOW the ctor or function
124 call that might cause a GC, do another resolve to reassign the oop, or
125 consider use of a Handle instead of an oop so there is immunity from object
126 motion. But note that the "QUICK" entries below do not have a handlemark
127 and thus can only support use of handles passed in.
128 */
129
130 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
131 ResourceMark rm;
132 int line_number = -1;
133 const char * source_file = NULL;
134 const char * trace = "explicit";
135 InstanceKlass* caller = NULL;
136 JavaThread* jthread = JavaThread::current();
137 if (jthread->has_last_Java_frame()) {
138 vframeStream vfst(jthread);
139
140 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
141 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
142 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
143 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
144 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
145
146 Method* last_caller = NULL;
147
148 while (!vfst.at_end()) {
149 Method* m = vfst.method();
150 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
151 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
152 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
153 break;
154 }
155 last_caller = m;
156 vfst.next();
157 }
158 // if this is called from Class.forName0 and that is called from Class.forName,
159 // then print the caller of Class.forName. If this is Class.loadClass, then print
160 // that caller, otherwise keep quiet since this should be picked up elsewhere.
161 bool found_it = false;
162 if (!vfst.at_end() &&
163 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
164 vfst.method()->name() == vmSymbols::forName0_name()) {
165 vfst.next();
166 if (!vfst.at_end() &&
167 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
168 vfst.method()->name() == vmSymbols::forName_name()) {
169 vfst.next();
170 found_it = true;
171 }
172 } else if (last_caller != NULL &&
173 last_caller->method_holder()->name() ==
174 vmSymbols::java_lang_ClassLoader() &&
175 last_caller->name() == vmSymbols::loadClass_name()) {
176 found_it = true;
177 } else if (!vfst.at_end()) {
178 if (vfst.method()->is_native()) {
179 // JNI call
180 found_it = true;
181 }
182 }
183 if (found_it && !vfst.at_end()) {
184 // found the caller
185 caller = vfst.method()->method_holder();
186 line_number = vfst.method()->line_number_from_bci(vfst.bci());
187 if (line_number == -1) {
188 // show method name if it's a native method
189 trace = vfst.method()->name_and_sig_as_C_string();
190 }
191 Symbol* s = caller->source_file_name();
192 if (s != NULL) {
193 source_file = s->as_C_string();
194 }
195 }
196 }
197 if (caller != NULL) {
198 if (to_class != caller) {
199 const char * from = caller->external_name();
200 const char * to = to_class->external_name();
201 // print in a single call to reduce interleaving between threads
202 if (source_file != NULL) {
203 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
204 } else {
205 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
206 }
207 }
208 }
209 }
210
211 void trace_class_resolution(Klass* to_class) {
212 EXCEPTION_MARK;
213 trace_class_resolution_impl(to_class, THREAD);
214 if (HAS_PENDING_EXCEPTION) {
215 CLEAR_PENDING_EXCEPTION;
216 }
217 }
218
219 // Wrapper to trace JVM functions
220
221 #ifdef ASSERT
222 Histogram* JVMHistogram;
223 volatile int JVMHistogram_lock = 0;
224
225 class JVMHistogramElement : public HistogramElement {
226 public:
227 JVMHistogramElement(const char* name);
228 };
229
230 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
231 _name = elementName;
232 uintx count = 0;
233
234 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
235 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
236 count +=1;
237 if ( (WarnOnStalledSpinLock > 0)
238 && (count % WarnOnStalledSpinLock == 0)) {
239 warning("JVMHistogram_lock seems to be stalled");
240 }
241 }
242 }
243
244 if(JVMHistogram == NULL)
245 JVMHistogram = new Histogram("JVM Call Counts",100);
246
247 JVMHistogram->add_element(this);
248 Atomic::dec(&JVMHistogram_lock);
249 }
250
251 #define JVMCountWrapper(arg) \
252 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
253 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
254
255 #define JVMWrapper(arg) JVMCountWrapper(arg);
256 #else
257 #define JVMWrapper(arg)
258 #endif
259
260
261 // Interface version /////////////////////////////////////////////////////////////////////
262
263
264 JVM_LEAF(jint, JVM_GetInterfaceVersion())
265 return JVM_INTERFACE_VERSION;
266 JVM_END
267
268
269 // java.lang.System //////////////////////////////////////////////////////////////////////
270
271
272 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
273 JVMWrapper("JVM_CurrentTimeMillis");
274 return os::javaTimeMillis();
275 JVM_END
276
277 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
278 JVMWrapper("JVM_NanoTime");
279 return os::javaTimeNanos();
280 JVM_END
281
282 // The function below is actually exposed by jdk.internal.misc.VM and not
283 // java.lang.System, but we choose to keep it here so that it stays next
284 // to JVM_CurrentTimeMillis and JVM_NanoTime
285
286 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
287 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
288
289 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
290 JVMWrapper("JVM_GetNanoTimeAdjustment");
291 jlong seconds;
292 jlong nanos;
293
294 os::javaTimeSystemUTC(seconds, nanos);
295
296 // We're going to verify that the result can fit in a long.
297 // For that we need the difference in seconds between 'seconds'
298 // and 'offset_secs' to be such that:
299 // |seconds - offset_secs| < (2^63/10^9)
300 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
301 // which makes |seconds - offset_secs| < 2^33
302 // and we will prefer +/- 2^32 as the maximum acceptable diff
303 // as 2^32 has a more natural feel than 2^33...
304 //
305 // So if |seconds - offset_secs| >= 2^32 - we return a special
306 // sentinel value (-1) which the caller should take as an
307 // exception value indicating that the offset given to us is
308 // too far from range of the current time - leading to too big
309 // a nano adjustment. The caller is expected to recover by
310 // computing a more accurate offset and calling this method
311 // again. (For the record 2^32 secs is ~136 years, so that
312 // should rarely happen)
313 //
314 jlong diff = seconds - offset_secs;
315 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
316 return -1; // sentinel value: the offset is too far off the target
317 }
318
319 // return the adjustment. If you compute a time by adding
320 // this number of nanoseconds along with the number of seconds
321 // in the offset you should get the current UTC time.
322 return (diff * (jlong)1000000000) + nanos;
323 JVM_END
324
325 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
326 jobject dst, jint dst_pos, jint length))
327 JVMWrapper("JVM_ArrayCopy");
328 // Check if we have null pointers
329 if (src == NULL || dst == NULL) {
330 THROW(vmSymbols::java_lang_NullPointerException());
331 }
332 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
333 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
334 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
335 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
336 // Do copy
337 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
338 JVM_END
339
340
341 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
342 JavaValue r(T_OBJECT);
343 // public synchronized Object put(Object key, Object value);
344 HandleMark hm(THREAD);
345 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
346 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
347 JavaCalls::call_virtual(&r,
348 props,
349 SystemDictionary::Properties_klass(),
350 vmSymbols::put_name(),
351 vmSymbols::object_object_object_signature(),
352 key_str,
353 value_str,
354 THREAD);
355 }
356
357
358 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
359
360 /*
361 * Return all of the system properties in a Java String array with alternating
362 * names and values from the jvm SystemProperty.
363 * Which includes some internal and all commandline -D defined properties.
364 */
365 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
366 JVMWrapper("JVM_GetProperties");
367 ResourceMark rm(THREAD);
368 HandleMark hm(THREAD);
369 int ndx = 0;
370 int fixedCount = 2;
371
372 SystemProperty* p = Arguments::system_properties();
373 int count = Arguments::PropertyList_count(p);
374
375 // Allocate result String array
376 InstanceKlass* ik = SystemDictionary::String_klass();
377 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
378 objArrayHandle result_h(THREAD, r);
379
380 while (p != NULL) {
381 const char * key = p->key();
382 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
383 const char * value = p->value();
384 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
385 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
386 result_h->obj_at_put(ndx * 2, key_str());
387 result_h->obj_at_put(ndx * 2 + 1, value_str());
388 ndx++;
389 }
390 p = p->next();
391 }
392
393 // Convert the -XX:MaxDirectMemorySize= command line flag
394 // to the sun.nio.MaxDirectMemorySize property.
395 // Do this after setting user properties to prevent people
396 // from setting the value with a -D option, as requested.
397 // Leave empty if not supplied
398 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
399 char as_chars[256];
400 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
401 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
402 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
403 result_h->obj_at_put(ndx * 2, key_str());
404 result_h->obj_at_put(ndx * 2 + 1, value_str());
405 ndx++;
406 }
407
408 // JVM monitoring and management support
409 // Add the sun.management.compiler property for the compiler's name
410 {
411 #undef CSIZE
412 #if defined(_LP64) || defined(_WIN64)
413 #define CSIZE "64-Bit "
414 #else
415 #define CSIZE
416 #endif // 64bit
417
418 #ifdef TIERED
419 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
420 #else
421 #if defined(COMPILER1)
422 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
423 #elif defined(COMPILER2)
424 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
425 #elif INCLUDE_JVMCI
426 #error "INCLUDE_JVMCI should imply TIERED"
427 #else
428 const char* compiler_name = "";
429 #endif // compilers
430 #endif // TIERED
431
432 if (*compiler_name != '\0' &&
433 (Arguments::mode() != Arguments::_int)) {
434 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
435 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
436 result_h->obj_at_put(ndx * 2, key_str());
437 result_h->obj_at_put(ndx * 2 + 1, value_str());
438 ndx++;
439 }
440 }
441
442 return (jobjectArray) JNIHandles::make_local(env, result_h());
443 JVM_END
444
445
446 /*
447 * Return the temporary directory that the VM uses for the attach
448 * and perf data files.
449 *
450 * It is important that this directory is well-known and the
451 * same for all VM instances. It cannot be affected by configuration
452 * variables such as java.io.tmpdir.
453 */
454 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
455 JVMWrapper("JVM_GetTemporaryDirectory");
456 HandleMark hm(THREAD);
457 const char* temp_dir = os::get_temp_directory();
458 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
459 return (jstring) JNIHandles::make_local(env, h());
460 JVM_END
461
462
463 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
464
465 extern volatile jint vm_created;
466
467 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
468 JVMWrapper("JVM_BeforeHalt");
469 EventShutdown event;
470 if (event.should_commit()) {
471 event.set_reason("Shutdown requested from Java");
472 event.commit();
473 }
474 JVM_END
475
476
477 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
478 before_exit(thread);
479 vm_exit(code);
480 JVM_END
481
482
483 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
484 JVMWrapper("JVM_GC");
485 if (!DisableExplicitGC) {
486 if (AsyncDeflateIdleMonitors) {
487 // AsyncDeflateIdleMonitors needs to know when System.gc() is
488 // called so any special clean up can be done at a safepoint.
489 ObjectSynchronizer::set_is_cleanup_requested(true);
490 }
491 Universe::heap()->collect(GCCause::_java_lang_system_gc);
492 }
493 JVM_END
494
495
496 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
497 JVMWrapper("JVM_MaxObjectInspectionAge");
498 return Universe::heap()->millis_since_last_gc();
499 JVM_END
500
501
502 static inline jlong convert_size_t_to_jlong(size_t val) {
503 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
504 NOT_LP64 (return (jlong)val;)
505 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
506 }
507
508 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
509 JVMWrapper("JVM_TotalMemory");
510 size_t n = Universe::heap()->capacity();
511 return convert_size_t_to_jlong(n);
512 JVM_END
513
514
515 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
516 JVMWrapper("JVM_FreeMemory");
517 CollectedHeap* ch = Universe::heap();
518 size_t n;
519 {
520 MutexLocker x(Heap_lock);
521 n = ch->capacity() - ch->used();
522 }
523 return convert_size_t_to_jlong(n);
524 JVM_END
525
526
527 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
528 JVMWrapper("JVM_MaxMemory");
529 size_t n = Universe::heap()->max_capacity();
530 return convert_size_t_to_jlong(n);
531 JVM_END
532
533
534 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
535 JVMWrapper("JVM_ActiveProcessorCount");
536 return os::active_processor_count();
537 JVM_END
538
539
540
541 // java.lang.Throwable //////////////////////////////////////////////////////
542
543
544 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
545 JVMWrapper("JVM_FillInStackTrace");
546 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
547 java_lang_Throwable::fill_in_stack_trace(exception);
548 JVM_END
549
550
551 // java.lang.StackTraceElement //////////////////////////////////////////////
552
553
554 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
555 JVMWrapper("JVM_InitStackTraceElementArray");
556 Handle exception(THREAD, JNIHandles::resolve(throwable));
557 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
558 objArrayHandle stack_trace(THREAD, st);
559 // Fill in the allocated stack trace
560 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
561 JVM_END
562
563
564 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
565 JVMWrapper("JVM_InitStackTraceElement");
566 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
567 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
568 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
569 JVM_END
570
571
572 // java.lang.StackWalker //////////////////////////////////////////////////////
573
574
575 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
576 jint skip_frames, jint frame_count, jint start_index,
577 jobjectArray frames))
578 JVMWrapper("JVM_CallStackWalk");
579 JavaThread* jt = (JavaThread*) THREAD;
580 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
581 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
582 }
583
584 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
585
586 // frames array is a Class<?>[] array when only getting caller reference,
587 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
588 // be null.
589 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
590 objArrayHandle frames_array_h(THREAD, fa);
591
592 int limit = start_index + frame_count;
593 if (frames_array_h->length() < limit) {
594 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
595 }
596
597 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
598 start_index, frames_array_h, CHECK_NULL);
599 return JNIHandles::make_local(env, result);
600 JVM_END
601
602
603 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
604 jint frame_count, jint start_index,
605 jobjectArray frames))
606 JVMWrapper("JVM_MoreStackWalk");
607 JavaThread* jt = (JavaThread*) THREAD;
608
609 // frames array is a Class<?>[] array when only getting caller reference,
610 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
611 // be null.
612 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
613 objArrayHandle frames_array_h(THREAD, fa);
614
615 int limit = start_index+frame_count;
616 if (frames_array_h->length() < limit) {
617 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
618 }
619
620 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
621 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
622 start_index, frames_array_h, THREAD);
623 JVM_END
624
625 // java.lang.Object ///////////////////////////////////////////////
626
627
628 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
629 JVMWrapper("JVM_IHashCode");
630 // as implemented in the classic virtual machine; return 0 if object is NULL
631 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
632 JVM_END
633
634
635 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
636 JVMWrapper("JVM_MonitorWait");
637 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
638 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
639 if (JvmtiExport::should_post_monitor_wait()) {
640 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
641
642 // The current thread already owns the monitor and it has not yet
643 // been added to the wait queue so the current thread cannot be
644 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
645 // event handler cannot accidentally consume an unpark() meant for
646 // the ParkEvent associated with this ObjectMonitor.
647 }
648 ObjectSynchronizer::wait(obj, ms, CHECK);
649 JVM_END
650
651
652 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
653 JVMWrapper("JVM_MonitorNotify");
654 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
655 ObjectSynchronizer::notify(obj, CHECK);
656 JVM_END
657
658
659 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
660 JVMWrapper("JVM_MonitorNotifyAll");
661 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
662 ObjectSynchronizer::notifyall(obj, CHECK);
663 JVM_END
664
665
666 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
667 JVMWrapper("JVM_Clone");
668 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
669 Klass* klass = obj->klass();
670 JvmtiVMObjectAllocEventCollector oam;
671
672 #ifdef ASSERT
673 // Just checking that the cloneable flag is set correct
674 if (obj->is_array()) {
675 guarantee(klass->is_cloneable(), "all arrays are cloneable");
676 } else {
677 guarantee(obj->is_instance(), "should be instanceOop");
678 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
679 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
680 }
681 #endif
682
683 // Check if class of obj supports the Cloneable interface.
684 // All arrays are considered to be cloneable (See JLS 20.1.5).
685 // All j.l.r.Reference classes are considered non-cloneable.
686 if (!klass->is_cloneable() ||
687 (klass->is_instance_klass() &&
688 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
689 ResourceMark rm(THREAD);
690 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
691 }
692
693 // Make shallow object copy
694 const int size = obj->size();
695 oop new_obj_oop = NULL;
696 if (obj->is_array()) {
697 const int length = ((arrayOop)obj())->length();
698 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
699 /* do_zero */ true, CHECK_NULL);
700 } else {
701 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
702 }
703
704 HeapAccess<>::clone(obj(), new_obj_oop, size);
705
706 Handle new_obj(THREAD, new_obj_oop);
707 // Caution: this involves a java upcall, so the clone should be
708 // "gc-robust" by this stage.
709 if (klass->has_finalizer()) {
710 assert(obj->is_instance(), "should be instanceOop");
711 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
712 new_obj = Handle(THREAD, new_obj_oop);
713 }
714
715 return JNIHandles::make_local(env, new_obj());
716 JVM_END
717
718 // java.io.File ///////////////////////////////////////////////////////////////
719
720 JVM_LEAF(char*, JVM_NativePath(char* path))
721 JVMWrapper("JVM_NativePath");
722 return os::native_path(path);
723 JVM_END
724
725
726 // Misc. class handling ///////////////////////////////////////////////////////////
727
728
729 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
730 JVMWrapper("JVM_GetCallerClass");
731
732 // Getting the class of the caller frame.
733 //
734 // The call stack at this point looks something like this:
735 //
736 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
737 // [1] [ @CallerSensitive API.method ]
738 // [.] [ (skipped intermediate frames) ]
739 // [n] [ caller ]
740 vframeStream vfst(thread);
741 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
742 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
743 Method* m = vfst.method();
744 assert(m != NULL, "sanity");
745 switch (n) {
746 case 0:
747 // This must only be called from Reflection.getCallerClass
748 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
749 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
750 }
751 // fall-through
752 case 1:
753 // Frame 0 and 1 must be caller sensitive.
754 if (!m->caller_sensitive()) {
755 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
756 }
757 break;
758 default:
759 if (!m->is_ignored_by_security_stack_walk()) {
760 // We have reached the desired frame; return the holder class.
761 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
762 }
763 break;
764 }
765 }
766 return NULL;
767 JVM_END
768
769
770 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
771 JVMWrapper("JVM_FindPrimitiveClass");
772 oop mirror = NULL;
773 BasicType t = name2type(utf);
774 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
775 mirror = Universe::java_mirror(t);
776 }
777 if (mirror == NULL) {
778 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
779 } else {
780 return (jclass) JNIHandles::make_local(env, mirror);
781 }
782 JVM_END
783
784
785 // Returns a class loaded by the bootstrap class loader; or null
786 // if not found. ClassNotFoundException is not thrown.
787 // FindClassFromBootLoader is exported to the launcher for windows.
788 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
789 const char* name))
790 JVMWrapper("JVM_FindClassFromBootLoader");
791
792 // Java libraries should ensure that name is never null...
793 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
794 // It's impossible to create this class; the name cannot fit
795 // into the constant pool.
796 return NULL;
797 }
798
799 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
800 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
801 if (k == NULL) {
802 return NULL;
803 }
804
805 if (log_is_enabled(Debug, class, resolve)) {
806 trace_class_resolution(k);
807 }
808 return (jclass) JNIHandles::make_local(env, k->java_mirror());
809 JVM_END
810
811 // Find a class with this name in this loader, using the caller's protection domain.
812 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
813 jboolean init, jobject loader,
814 jclass caller))
815 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
816 // Java libraries should ensure that name is never null...
817 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
818 // It's impossible to create this class; the name cannot fit
819 // into the constant pool.
820 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
821 }
822
823 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
824
825 oop loader_oop = JNIHandles::resolve(loader);
826 oop from_class = JNIHandles::resolve(caller);
827 oop protection_domain = NULL;
828 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
829 // NPE. Put it in another way, the bootstrap class loader has all permission and
830 // thus no checkPackageAccess equivalence in the VM class loader.
831 // The caller is also passed as NULL by the java code if there is no security
832 // manager to avoid the performance cost of getting the calling class.
833 if (from_class != NULL && loader_oop != NULL) {
834 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
835 }
836
837 Handle h_loader(THREAD, loader_oop);
838 Handle h_prot(THREAD, protection_domain);
839 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
840 h_prot, false, THREAD);
841
842 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
843 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
844 }
845 return result;
846 JVM_END
847
848 // Currently only called from the old verifier.
849 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
850 jboolean init, jclass from))
851 JVMWrapper("JVM_FindClassFromClass");
852 if (name == NULL) {
853 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
854 }
855 if ((int)strlen(name) > Symbol::max_length()) {
856 // It's impossible to create this class; the name cannot fit
857 // into the constant pool.
858 Exceptions::fthrow(THREAD_AND_LOCATION,
859 vmSymbols::java_lang_NoClassDefFoundError(),
860 "Class name exceeds maximum length of %d: %s",
861 Symbol::max_length(),
862 name);
863 return 0;
864 }
865 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
866 oop from_class_oop = JNIHandles::resolve(from);
867 Klass* from_class = (from_class_oop == NULL)
868 ? (Klass*)NULL
869 : java_lang_Class::as_Klass(from_class_oop);
870 oop class_loader = NULL;
871 oop protection_domain = NULL;
872 if (from_class != NULL) {
873 class_loader = from_class->class_loader();
874 protection_domain = from_class->protection_domain();
875 }
876 Handle h_loader(THREAD, class_loader);
877 Handle h_prot (THREAD, protection_domain);
878 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
879 h_prot, true, thread);
880
881 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
882 // this function is generally only used for class loading during verification.
883 ResourceMark rm;
884 oop from_mirror = JNIHandles::resolve_non_null(from);
885 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
886 const char * from_name = from_class->external_name();
887
888 oop mirror = JNIHandles::resolve_non_null(result);
889 Klass* to_class = java_lang_Class::as_Klass(mirror);
890 const char * to = to_class->external_name();
891 log_debug(class, resolve)("%s %s (verification)", from_name, to);
892 }
893
894 return result;
895 JVM_END
896
897 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
898 if (loader.is_null()) {
899 return;
900 }
901
902 // check whether the current caller thread holds the lock or not.
903 // If not, increment the corresponding counter
904 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
905 ObjectSynchronizer::owner_self) {
906 counter->inc();
907 }
908 }
909
910 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
911 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
912 jobject loader, const jbyte *buf,
913 jsize len, jobject pd, const char *source,
914 TRAPS) {
915 if (source == NULL) source = "__JVM_DefineClass__";
916
917 assert(THREAD->is_Java_thread(), "must be a JavaThread");
918 JavaThread* jt = (JavaThread*) THREAD;
919
920 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
921 ClassLoader::perf_define_appclass_selftime(),
922 ClassLoader::perf_define_appclasses(),
923 jt->get_thread_stat()->perf_recursion_counts_addr(),
924 jt->get_thread_stat()->perf_timers_addr(),
925 PerfClassTraceTime::DEFINE_CLASS);
926
927 if (UsePerfData) {
928 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
929 }
930
931 // Since exceptions can be thrown, class initialization can take place
932 // if name is NULL no check for class name in .class stream has to be made.
933 TempNewSymbol class_name = NULL;
934 if (name != NULL) {
935 const int str_len = (int)strlen(name);
936 if (str_len > Symbol::max_length()) {
937 // It's impossible to create this class; the name cannot fit
938 // into the constant pool.
939 Exceptions::fthrow(THREAD_AND_LOCATION,
940 vmSymbols::java_lang_NoClassDefFoundError(),
941 "Class name exceeds maximum length of %d: %s",
942 Symbol::max_length(),
943 name);
944 return 0;
945 }
946 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
947 }
948
949 ResourceMark rm(THREAD);
950 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
951 Handle class_loader (THREAD, JNIHandles::resolve(loader));
952 if (UsePerfData) {
953 is_lock_held_by_thread(class_loader,
954 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
955 THREAD);
956 }
957 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
958 Klass* k = SystemDictionary::resolve_from_stream(class_name,
959 class_loader,
960 protection_domain,
961 &st,
962 CHECK_NULL);
963
964 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
965 trace_class_resolution(k);
966 }
967
968 return (jclass) JNIHandles::make_local(env, k->java_mirror());
969 }
970
971
972 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
973 JVMWrapper("JVM_DefineClass");
974
975 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
976 JVM_END
977
978
979 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
980 JVMWrapper("JVM_DefineClassWithSource");
981
982 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
983 JVM_END
984
985 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
986 JVMWrapper("JVM_FindLoadedClass");
987 ResourceMark rm(THREAD);
988
989 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
990 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
991
992 const char* str = java_lang_String::as_utf8_string(string());
993 // Sanity check, don't expect null
994 if (str == NULL) return NULL;
995
996 const int str_len = (int)strlen(str);
997 if (str_len > Symbol::max_length()) {
998 // It's impossible to create this class; the name cannot fit
999 // into the constant pool.
1000 return NULL;
1001 }
1002 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
1003
1004 // Security Note:
1005 // The Java level wrapper will perform the necessary security check allowing
1006 // us to pass the NULL as the initiating class loader.
1007 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1008 if (UsePerfData) {
1009 is_lock_held_by_thread(h_loader,
1010 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1011 THREAD);
1012 }
1013
1014 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1015 h_loader,
1016 Handle(),
1017 CHECK_NULL);
1018 #if INCLUDE_CDS
1019 if (k == NULL) {
1020 // If the class is not already loaded, try to see if it's in the shared
1021 // archive for the current classloader (h_loader).
1022 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1023 }
1024 #endif
1025 return (k == NULL) ? NULL :
1026 (jclass) JNIHandles::make_local(env, k->java_mirror());
1027 JVM_END
1028
1029 // Module support //////////////////////////////////////////////////////////////////////////////
1030
1031 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1032 jstring location, const char* const* packages, jsize num_packages))
1033 JVMWrapper("JVM_DefineModule");
1034 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1035 JVM_END
1036
1037 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1038 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1039 Modules::set_bootloader_unnamed_module(module, CHECK);
1040 JVM_END
1041
1042 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1043 JVMWrapper("JVM_AddModuleExports");
1044 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1045 JVM_END
1046
1047 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1048 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1049 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1050 JVM_END
1051
1052 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1053 JVMWrapper("JVM_AddModuleExportsToAll");
1054 Modules::add_module_exports(from_module, package, NULL, CHECK);
1055 JVM_END
1056
1057 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1058 JVMWrapper("JVM_AddReadsModule");
1059 Modules::add_reads_module(from_module, source_module, CHECK);
1060 JVM_END
1061
1062 // Reflection support //////////////////////////////////////////////////////////////////////////////
1063
1064 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1065 assert (cls != NULL, "illegal class");
1066 JVMWrapper("JVM_InitClassName");
1067 JvmtiVMObjectAllocEventCollector oam;
1068 ResourceMark rm(THREAD);
1069 HandleMark hm(THREAD);
1070 Handle java_class(THREAD, JNIHandles::resolve(cls));
1071 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1072 return (jstring) JNIHandles::make_local(env, result);
1073 JVM_END
1074
1075
1076 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1077 JVMWrapper("JVM_GetClassInterfaces");
1078 JvmtiVMObjectAllocEventCollector oam;
1079 oop mirror = JNIHandles::resolve_non_null(cls);
1080
1081 // Special handling for primitive objects
1082 if (java_lang_Class::is_primitive(mirror)) {
1083 // Primitive objects does not have any interfaces
1084 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1085 return (jobjectArray) JNIHandles::make_local(env, r);
1086 }
1087
1088 Klass* klass = java_lang_Class::as_Klass(mirror);
1089 // Figure size of result array
1090 int size;
1091 if (klass->is_instance_klass()) {
1092 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1093 } else {
1094 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1095 size = 2;
1096 }
1097
1098 // Allocate result array
1099 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1100 objArrayHandle result (THREAD, r);
1101 // Fill in result
1102 if (klass->is_instance_klass()) {
1103 // Regular instance klass, fill in all local interfaces
1104 for (int index = 0; index < size; index++) {
1105 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1106 result->obj_at_put(index, k->java_mirror());
1107 }
1108 } else {
1109 // All arrays implement java.lang.Cloneable and java.io.Serializable
1110 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1111 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1112 }
1113 return (jobjectArray) JNIHandles::make_local(env, result());
1114 JVM_END
1115
1116
1117 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1118 JVMWrapper("JVM_IsInterface");
1119 oop mirror = JNIHandles::resolve_non_null(cls);
1120 if (java_lang_Class::is_primitive(mirror)) {
1121 return JNI_FALSE;
1122 }
1123 Klass* k = java_lang_Class::as_Klass(mirror);
1124 jboolean result = k->is_interface();
1125 assert(!result || k->is_instance_klass(),
1126 "all interfaces are instance types");
1127 // The compiler intrinsic for isInterface tests the
1128 // Klass::_access_flags bits in the same way.
1129 return result;
1130 JVM_END
1131
1132
1133 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1134 JVMWrapper("JVM_GetClassSigners");
1135 JvmtiVMObjectAllocEventCollector oam;
1136 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1137 // There are no signers for primitive types
1138 return NULL;
1139 }
1140
1141 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1142
1143 // If there are no signers set in the class, or if the class
1144 // is an array, return NULL.
1145 if (signers == NULL) return NULL;
1146
1147 // copy of the signers array
1148 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1149 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1150 for (int index = 0; index < signers->length(); index++) {
1151 signers_copy->obj_at_put(index, signers->obj_at(index));
1152 }
1153
1154 // return the copy
1155 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1156 JVM_END
1157
1158
1159 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1160 JVMWrapper("JVM_SetClassSigners");
1161 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1162 // This call is ignored for primitive types and arrays.
1163 // Signers are only set once, ClassLoader.java, and thus shouldn't
1164 // be called with an array. Only the bootstrap loader creates arrays.
1165 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1166 if (k->is_instance_klass()) {
1167 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1168 }
1169 }
1170 JVM_END
1171
1172
1173 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1174 JVMWrapper("JVM_GetProtectionDomain");
1175 if (JNIHandles::resolve(cls) == NULL) {
1176 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1177 }
1178
1179 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1180 // Primitive types does not have a protection domain.
1181 return NULL;
1182 }
1183
1184 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1185 return (jobject) JNIHandles::make_local(env, pd);
1186 JVM_END
1187
1188
1189 // Returns the inherited_access_control_context field of the running thread.
1190 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1191 JVMWrapper("JVM_GetInheritedAccessControlContext");
1192 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1193 return JNIHandles::make_local(env, result);
1194 JVM_END
1195
1196 class RegisterArrayForGC {
1197 private:
1198 JavaThread *_thread;
1199 public:
1200 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1201 _thread = thread;
1202 _thread->register_array_for_gc(array);
1203 }
1204
1205 ~RegisterArrayForGC() {
1206 _thread->register_array_for_gc(NULL);
1207 }
1208 };
1209
1210
1211 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1212 JVMWrapper("JVM_GetStackAccessControlContext");
1213 if (!UsePrivilegedStack) return NULL;
1214
1215 ResourceMark rm(THREAD);
1216 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1217 JvmtiVMObjectAllocEventCollector oam;
1218
1219 // count the protection domains on the execution stack. We collapse
1220 // duplicate consecutive protection domains into a single one, as
1221 // well as stopping when we hit a privileged frame.
1222
1223 oop previous_protection_domain = NULL;
1224 Handle privileged_context(thread, NULL);
1225 bool is_privileged = false;
1226 oop protection_domain = NULL;
1227
1228 // Iterate through Java frames
1229 vframeStream vfst(thread);
1230 for(; !vfst.at_end(); vfst.next()) {
1231 // get method of frame
1232 Method* method = vfst.method();
1233
1234 // stop at the first privileged frame
1235 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1236 method->name() == vmSymbols::executePrivileged_name())
1237 {
1238 // this frame is privileged
1239 is_privileged = true;
1240
1241 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1242
1243 StackValueCollection* locals = priv->locals();
1244 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1245 StackValue* clr_sv = locals->at(2); // Class<?> caller
1246 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1247 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1248 privileged_context = ctx_sv->get_obj();
1249 Handle caller = clr_sv->get_obj();
1250
1251 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1252 protection_domain = caller_klass->protection_domain();
1253 } else {
1254 protection_domain = method->method_holder()->protection_domain();
1255 }
1256
1257 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) {
1258 local_array->push(protection_domain);
1259 previous_protection_domain = protection_domain;
1260 }
1261
1262 if (is_privileged) break;
1263 }
1264
1265
1266 // either all the domains on the stack were system domains, or
1267 // we had a privileged system domain
1268 if (local_array->is_empty()) {
1269 if (is_privileged && privileged_context.is_null()) return NULL;
1270
1271 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1272 return JNIHandles::make_local(env, result);
1273 }
1274
1275 // the resource area must be registered in case of a gc
1276 RegisterArrayForGC ragc(thread, local_array);
1277 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1278 local_array->length(), CHECK_NULL);
1279 objArrayHandle h_context(thread, context);
1280 for (int index = 0; index < local_array->length(); index++) {
1281 h_context->obj_at_put(index, local_array->at(index));
1282 }
1283
1284 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1285
1286 return JNIHandles::make_local(env, result);
1287 JVM_END
1288
1289
1290 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1291 JVMWrapper("JVM_IsArrayClass");
1292 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1293 return (k != NULL) && k->is_array_klass() ? true : false;
1294 JVM_END
1295
1296
1297 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1298 JVMWrapper("JVM_IsPrimitiveClass");
1299 oop mirror = JNIHandles::resolve_non_null(cls);
1300 return (jboolean) java_lang_Class::is_primitive(mirror);
1301 JVM_END
1302
1303
1304 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1305 JVMWrapper("JVM_GetClassModifiers");
1306 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1307 // Primitive type
1308 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1309 }
1310
1311 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1312 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1313 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1314 return k->modifier_flags();
1315 JVM_END
1316
1317
1318 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1319
1320 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1321 JvmtiVMObjectAllocEventCollector oam;
1322 // ofClass is a reference to a java_lang_Class object. The mirror object
1323 // of an InstanceKlass
1324
1325 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1326 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1327 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1328 return (jobjectArray)JNIHandles::make_local(env, result);
1329 }
1330
1331 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1332 InnerClassesIterator iter(k);
1333
1334 if (iter.length() == 0) {
1335 // Neither an inner nor outer class
1336 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1337 return (jobjectArray)JNIHandles::make_local(env, result);
1338 }
1339
1340 // find inner class info
1341 constantPoolHandle cp(thread, k->constants());
1342 int length = iter.length();
1343
1344 // Allocate temp. result array
1345 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1346 objArrayHandle result (THREAD, r);
1347 int members = 0;
1348
1349 for (; !iter.done(); iter.next()) {
1350 int ioff = iter.inner_class_info_index();
1351 int ooff = iter.outer_class_info_index();
1352
1353 if (ioff != 0 && ooff != 0) {
1354 // Check to see if the name matches the class we're looking for
1355 // before attempting to find the class.
1356 if (cp->klass_name_at_matches(k, ooff)) {
1357 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1358 if (outer_klass == k) {
1359 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1360 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1361
1362 // Throws an exception if outer klass has not declared k as
1363 // an inner klass
1364 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1365
1366 result->obj_at_put(members, inner_klass->java_mirror());
1367 members++;
1368 }
1369 }
1370 }
1371 }
1372
1373 if (members != length) {
1374 // Return array of right length
1375 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1376 for(int i = 0; i < members; i++) {
1377 res->obj_at_put(i, result->obj_at(i));
1378 }
1379 return (jobjectArray)JNIHandles::make_local(env, res);
1380 }
1381
1382 return (jobjectArray)JNIHandles::make_local(env, result());
1383 JVM_END
1384
1385
1386 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1387 {
1388 // ofClass is a reference to a java_lang_Class object.
1389 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1390 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1391 return NULL;
1392 }
1393
1394 bool inner_is_member = false;
1395 Klass* outer_klass
1396 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1397 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1398 if (outer_klass == NULL) return NULL; // already a top-level class
1399 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1400 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1401 }
1402 JVM_END
1403
1404 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1405 {
1406 oop mirror = JNIHandles::resolve_non_null(cls);
1407 if (java_lang_Class::is_primitive(mirror) ||
1408 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1409 return NULL;
1410 }
1411 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1412 int ooff = 0, noff = 0;
1413 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1414 if (noff != 0) {
1415 constantPoolHandle i_cp(thread, k->constants());
1416 Symbol* name = i_cp->symbol_at(noff);
1417 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1418 return (jstring) JNIHandles::make_local(env, str());
1419 }
1420 }
1421 return NULL;
1422 }
1423 JVM_END
1424
1425 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1426 assert (cls != NULL, "illegal class");
1427 JVMWrapper("JVM_GetClassSignature");
1428 JvmtiVMObjectAllocEventCollector oam;
1429 ResourceMark rm(THREAD);
1430 // Return null for arrays and primatives
1431 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1432 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1433 if (k->is_instance_klass()) {
1434 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1435 if (sym == NULL) return NULL;
1436 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1437 return (jstring) JNIHandles::make_local(env, str());
1438 }
1439 }
1440 return NULL;
1441 JVM_END
1442
1443
1444 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1445 assert (cls != NULL, "illegal class");
1446 JVMWrapper("JVM_GetClassAnnotations");
1447
1448 // Return null for arrays and primitives
1449 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1450 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1451 if (k->is_instance_klass()) {
1452 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1453 return (jbyteArray) JNIHandles::make_local(env, a);
1454 }
1455 }
1456 return NULL;
1457 JVM_END
1458
1459
1460 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1461 // some of this code was adapted from from jni_FromReflectedField
1462
1463 oop reflected = JNIHandles::resolve_non_null(field);
1464 oop mirror = java_lang_reflect_Field::clazz(reflected);
1465 Klass* k = java_lang_Class::as_Klass(mirror);
1466 int slot = java_lang_reflect_Field::slot(reflected);
1467 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1468
1469 InstanceKlass* ik = InstanceKlass::cast(k);
1470 intptr_t offset = ik->field_offset(slot);
1471
1472 if (modifiers & JVM_ACC_STATIC) {
1473 // for static fields we only look in the current class
1474 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1475 assert(false, "cannot find static field");
1476 return false;
1477 }
1478 } else {
1479 // for instance fields we start with the current class and work
1480 // our way up through the superclass chain
1481 if (!ik->find_field_from_offset(offset, false, &fd)) {
1482 assert(false, "cannot find instance field");
1483 return false;
1484 }
1485 }
1486 return true;
1487 }
1488
1489 static Method* jvm_get_method_common(jobject method) {
1490 // some of this code was adapted from from jni_FromReflectedMethod
1491
1492 oop reflected = JNIHandles::resolve_non_null(method);
1493 oop mirror = NULL;
1494 int slot = 0;
1495
1496 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1497 mirror = java_lang_reflect_Constructor::clazz(reflected);
1498 slot = java_lang_reflect_Constructor::slot(reflected);
1499 } else {
1500 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1501 "wrong type");
1502 mirror = java_lang_reflect_Method::clazz(reflected);
1503 slot = java_lang_reflect_Method::slot(reflected);
1504 }
1505 Klass* k = java_lang_Class::as_Klass(mirror);
1506
1507 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1508 assert(m != NULL, "cannot find method");
1509 return m; // caller has to deal with NULL in product mode
1510 }
1511
1512 /* Type use annotations support (JDK 1.8) */
1513
1514 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1515 assert (cls != NULL, "illegal class");
1516 JVMWrapper("JVM_GetClassTypeAnnotations");
1517 ResourceMark rm(THREAD);
1518 // Return null for arrays and primitives
1519 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1520 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1521 if (k->is_instance_klass()) {
1522 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1523 if (type_annotations != NULL) {
1524 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1525 return (jbyteArray) JNIHandles::make_local(env, a);
1526 }
1527 }
1528 }
1529 return NULL;
1530 JVM_END
1531
1532 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1533 assert (method != NULL, "illegal method");
1534 JVMWrapper("JVM_GetMethodTypeAnnotations");
1535
1536 // method is a handle to a java.lang.reflect.Method object
1537 Method* m = jvm_get_method_common(method);
1538 if (m == NULL) {
1539 return NULL;
1540 }
1541
1542 AnnotationArray* type_annotations = m->type_annotations();
1543 if (type_annotations != NULL) {
1544 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1545 return (jbyteArray) JNIHandles::make_local(env, a);
1546 }
1547
1548 return NULL;
1549 JVM_END
1550
1551 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1552 assert (field != NULL, "illegal field");
1553 JVMWrapper("JVM_GetFieldTypeAnnotations");
1554
1555 fieldDescriptor fd;
1556 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1557 if (!gotFd) {
1558 return NULL;
1559 }
1560
1561 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1562 JVM_END
1563
1564 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1565 if (!cp->is_within_bounds(index)) {
1566 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1567 }
1568 }
1569
1570 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1571 {
1572 JVMWrapper("JVM_GetMethodParameters");
1573 // method is a handle to a java.lang.reflect.Method object
1574 Method* method_ptr = jvm_get_method_common(method);
1575 methodHandle mh (THREAD, method_ptr);
1576 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1577 const int num_params = mh->method_parameters_length();
1578
1579 if (num_params < 0) {
1580 // A -1 return value from method_parameters_length means there is no
1581 // parameter data. Return null to indicate this to the reflection
1582 // API.
1583 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1584 return (jobjectArray)NULL;
1585 } else {
1586 // Otherwise, we return something up to reflection, even if it is
1587 // a zero-length array. Why? Because in some cases this can
1588 // trigger a MalformedParametersException.
1589
1590 // make sure all the symbols are properly formatted
1591 for (int i = 0; i < num_params; i++) {
1592 MethodParametersElement* params = mh->method_parameters_start();
1593 int index = params[i].name_cp_index;
1594 bounds_check(mh->constants(), index, CHECK_NULL);
1595
1596 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1597 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1598 "Wrong type at constant pool index");
1599 }
1600
1601 }
1602
1603 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1604 objArrayHandle result (THREAD, result_oop);
1605
1606 for (int i = 0; i < num_params; i++) {
1607 MethodParametersElement* params = mh->method_parameters_start();
1608 // For a 0 index, give a NULL symbol
1609 Symbol* sym = 0 != params[i].name_cp_index ?
1610 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1611 int flags = params[i].flags;
1612 oop param = Reflection::new_parameter(reflected_method, i, sym,
1613 flags, CHECK_NULL);
1614 result->obj_at_put(i, param);
1615 }
1616 return (jobjectArray)JNIHandles::make_local(env, result());
1617 }
1618 }
1619 JVM_END
1620
1621 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1622
1623 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1624 {
1625 JVMWrapper("JVM_GetClassDeclaredFields");
1626 JvmtiVMObjectAllocEventCollector oam;
1627
1628 // Exclude primitive types and array types
1629 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1630 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1631 // Return empty array
1632 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1633 return (jobjectArray) JNIHandles::make_local(env, res);
1634 }
1635
1636 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1637 constantPoolHandle cp(THREAD, k->constants());
1638
1639 // Ensure class is linked
1640 k->link_class(CHECK_NULL);
1641
1642 // Allocate result
1643 int num_fields;
1644
1645 if (publicOnly) {
1646 num_fields = 0;
1647 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1648 if (fs.access_flags().is_public()) ++num_fields;
1649 }
1650 } else {
1651 num_fields = k->java_fields_count();
1652 }
1653
1654 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1655 objArrayHandle result (THREAD, r);
1656
1657 int out_idx = 0;
1658 fieldDescriptor fd;
1659 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1660 if (!publicOnly || fs.access_flags().is_public()) {
1661 fd.reinitialize(k, fs.index());
1662 oop field = Reflection::new_field(&fd, CHECK_NULL);
1663 result->obj_at_put(out_idx, field);
1664 ++out_idx;
1665 }
1666 }
1667 assert(out_idx == num_fields, "just checking");
1668 return (jobjectArray) JNIHandles::make_local(env, result());
1669 }
1670 JVM_END
1671
1672 static bool select_method(const methodHandle& method, bool want_constructor) {
1673 if (want_constructor) {
1674 return (method->is_initializer() && !method->is_static());
1675 } else {
1676 return (!method->is_initializer() && !method->is_overpass());
1677 }
1678 }
1679
1680 static jobjectArray get_class_declared_methods_helper(
1681 JNIEnv *env,
1682 jclass ofClass, jboolean publicOnly,
1683 bool want_constructor,
1684 Klass* klass, TRAPS) {
1685
1686 JvmtiVMObjectAllocEventCollector oam;
1687
1688 // Exclude primitive types and array types
1689 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1690 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1691 // Return empty array
1692 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1693 return (jobjectArray) JNIHandles::make_local(env, res);
1694 }
1695
1696 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1697
1698 // Ensure class is linked
1699 k->link_class(CHECK_NULL);
1700
1701 Array<Method*>* methods = k->methods();
1702 int methods_length = methods->length();
1703
1704 // Save original method_idnum in case of redefinition, which can change
1705 // the idnum of obsolete methods. The new method will have the same idnum
1706 // but if we refresh the methods array, the counts will be wrong.
1707 ResourceMark rm(THREAD);
1708 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1709 int num_methods = 0;
1710
1711 for (int i = 0; i < methods_length; i++) {
1712 methodHandle method(THREAD, methods->at(i));
1713 if (select_method(method, want_constructor)) {
1714 if (!publicOnly || method->is_public()) {
1715 idnums->push(method->method_idnum());
1716 ++num_methods;
1717 }
1718 }
1719 }
1720
1721 // Allocate result
1722 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1723 objArrayHandle result (THREAD, r);
1724
1725 // Now just put the methods that we selected above, but go by their idnum
1726 // in case of redefinition. The methods can be redefined at any safepoint,
1727 // so above when allocating the oop array and below when creating reflect
1728 // objects.
1729 for (int i = 0; i < num_methods; i++) {
1730 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1731 if (method.is_null()) {
1732 // Method may have been deleted and seems this API can handle null
1733 // Otherwise should probably put a method that throws NSME
1734 result->obj_at_put(i, NULL);
1735 } else {
1736 oop m;
1737 if (want_constructor) {
1738 m = Reflection::new_constructor(method, CHECK_NULL);
1739 } else {
1740 m = Reflection::new_method(method, false, CHECK_NULL);
1741 }
1742 result->obj_at_put(i, m);
1743 }
1744 }
1745
1746 return (jobjectArray) JNIHandles::make_local(env, result());
1747 }
1748
1749 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1750 {
1751 JVMWrapper("JVM_GetClassDeclaredMethods");
1752 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1753 /*want_constructor*/ false,
1754 SystemDictionary::reflect_Method_klass(), THREAD);
1755 }
1756 JVM_END
1757
1758 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1759 {
1760 JVMWrapper("JVM_GetClassDeclaredConstructors");
1761 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1762 /*want_constructor*/ true,
1763 SystemDictionary::reflect_Constructor_klass(), THREAD);
1764 }
1765 JVM_END
1766
1767 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1768 {
1769 JVMWrapper("JVM_GetClassAccessFlags");
1770 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1771 // Primitive type
1772 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1773 }
1774
1775 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1776 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1777 }
1778 JVM_END
1779
1780 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1781 {
1782 JVMWrapper("JVM_AreNestMates");
1783 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1784 assert(c->is_instance_klass(), "must be");
1785 InstanceKlass* ck = InstanceKlass::cast(c);
1786 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1787 assert(m->is_instance_klass(), "must be");
1788 InstanceKlass* mk = InstanceKlass::cast(m);
1789 return ck->has_nestmate_access_to(mk, THREAD);
1790 }
1791 JVM_END
1792
1793 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1794 {
1795 // current is not a primitive or array class
1796 JVMWrapper("JVM_GetNestHost");
1797 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1798 assert(c->is_instance_klass(), "must be");
1799 InstanceKlass* ck = InstanceKlass::cast(c);
1800 // Don't post exceptions if validation fails
1801 InstanceKlass* host = ck->nest_host(NULL, THREAD);
1802 return (jclass) (host == NULL ? NULL :
1803 JNIHandles::make_local(THREAD, host->java_mirror()));
1804 }
1805 JVM_END
1806
1807 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1808 {
1809 // current is not a primitive or array class
1810 JVMWrapper("JVM_GetNestMembers");
1811 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1812 assert(c->is_instance_klass(), "must be");
1813 InstanceKlass* ck = InstanceKlass::cast(c);
1814 // Get the nest host for this nest - throw ICCE if validation fails
1815 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
1816 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
1817
1818 {
1819 JvmtiVMObjectAllocEventCollector oam;
1820 Array<u2>* members = host->nest_members();
1821 int length = members == NULL ? 0 : members->length();
1822 // nest host is first in the array so make it one bigger
1823 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
1824 length + 1, CHECK_NULL);
1825 objArrayHandle result (THREAD, r);
1826 result->obj_at_put(0, host->java_mirror());
1827 if (length != 0) {
1828 int i;
1829 for (i = 0; i < length; i++) {
1830 int cp_index = members->at(i);
1831 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
1832 if (k->is_instance_klass()) {
1833 InstanceKlass* nest_host_k =
1834 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
1835 if (nest_host_k == host) {
1836 result->obj_at_put(i+1, k->java_mirror());
1837 }
1838 else {
1839 // k's nest host is legal but it isn't our host so
1840 // throw ICCE
1841 ResourceMark rm(THREAD);
1842 Exceptions::fthrow(THREAD_AND_LOCATION,
1843 icce,
1844 "Nest member %s in %s declares a different nest host of %s",
1845 k->external_name(),
1846 host->external_name(),
1847 nest_host_k->external_name()
1848 );
1849 return NULL;
1850 }
1851 }
1852 else {
1853 // we have a bad nest member entry - throw ICCE
1854 ResourceMark rm(THREAD);
1855 Exceptions::fthrow(THREAD_AND_LOCATION,
1856 icce,
1857 "Class %s can not be a nest member of %s",
1858 k->external_name(),
1859 host->external_name()
1860 );
1861 return NULL;
1862 }
1863 }
1864 }
1865 else {
1866 assert(host == ck, "must be singleton nest");
1867 }
1868 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1869 }
1870 }
1871 JVM_END
1872
1873 // Constant pool access //////////////////////////////////////////////////////////
1874
1875 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1876 {
1877 JVMWrapper("JVM_GetClassConstantPool");
1878 JvmtiVMObjectAllocEventCollector oam;
1879
1880 // Return null for primitives and arrays
1881 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1882 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1883 if (k->is_instance_klass()) {
1884 InstanceKlass* k_h = InstanceKlass::cast(k);
1885 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1886 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1887 return JNIHandles::make_local(jcp());
1888 }
1889 }
1890 return NULL;
1891 }
1892 JVM_END
1893
1894
1895 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1896 {
1897 JVMWrapper("JVM_ConstantPoolGetSize");
1898 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1899 return cp->length();
1900 }
1901 JVM_END
1902
1903
1904 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1905 {
1906 JVMWrapper("JVM_ConstantPoolGetClassAt");
1907 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1908 bounds_check(cp, index, CHECK_NULL);
1909 constantTag tag = cp->tag_at(index);
1910 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1911 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1912 }
1913 Klass* k = cp->klass_at(index, CHECK_NULL);
1914 return (jclass) JNIHandles::make_local(k->java_mirror());
1915 }
1916 JVM_END
1917
1918 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1919 {
1920 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1921 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1922 bounds_check(cp, index, CHECK_NULL);
1923 constantTag tag = cp->tag_at(index);
1924 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1925 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1926 }
1927 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1928 if (k == NULL) return NULL;
1929 return (jclass) JNIHandles::make_local(k->java_mirror());
1930 }
1931 JVM_END
1932
1933 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1934 constantTag tag = cp->tag_at(index);
1935 if (!tag.is_method() && !tag.is_interface_method()) {
1936 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1937 }
1938 int klass_ref = cp->uncached_klass_ref_index_at(index);
1939 Klass* k_o;
1940 if (force_resolution) {
1941 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1942 } else {
1943 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1944 if (k_o == NULL) return NULL;
1945 }
1946 InstanceKlass* k = InstanceKlass::cast(k_o);
1947 Symbol* name = cp->uncached_name_ref_at(index);
1948 Symbol* sig = cp->uncached_signature_ref_at(index);
1949 methodHandle m (THREAD, k->find_method(name, sig));
1950 if (m.is_null()) {
1951 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1952 }
1953 oop method;
1954 if (!m->is_initializer() || m->is_static()) {
1955 method = Reflection::new_method(m, true, CHECK_NULL);
1956 } else {
1957 method = Reflection::new_constructor(m, CHECK_NULL);
1958 }
1959 return JNIHandles::make_local(method);
1960 }
1961
1962 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1963 {
1964 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1965 JvmtiVMObjectAllocEventCollector oam;
1966 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1967 bounds_check(cp, index, CHECK_NULL);
1968 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1969 return res;
1970 }
1971 JVM_END
1972
1973 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1974 {
1975 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1976 JvmtiVMObjectAllocEventCollector oam;
1977 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1978 bounds_check(cp, index, CHECK_NULL);
1979 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1980 return res;
1981 }
1982 JVM_END
1983
1984 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1985 constantTag tag = cp->tag_at(index);
1986 if (!tag.is_field()) {
1987 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1988 }
1989 int klass_ref = cp->uncached_klass_ref_index_at(index);
1990 Klass* k_o;
1991 if (force_resolution) {
1992 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1993 } else {
1994 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1995 if (k_o == NULL) return NULL;
1996 }
1997 InstanceKlass* k = InstanceKlass::cast(k_o);
1998 Symbol* name = cp->uncached_name_ref_at(index);
1999 Symbol* sig = cp->uncached_signature_ref_at(index);
2000 fieldDescriptor fd;
2001 Klass* target_klass = k->find_field(name, sig, &fd);
2002 if (target_klass == NULL) {
2003 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2004 }
2005 oop field = Reflection::new_field(&fd, CHECK_NULL);
2006 return JNIHandles::make_local(field);
2007 }
2008
2009 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2010 {
2011 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2012 JvmtiVMObjectAllocEventCollector oam;
2013 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2014 bounds_check(cp, index, CHECK_NULL);
2015 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2016 return res;
2017 }
2018 JVM_END
2019
2020 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2021 {
2022 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2023 JvmtiVMObjectAllocEventCollector oam;
2024 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2025 bounds_check(cp, index, CHECK_NULL);
2026 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2027 return res;
2028 }
2029 JVM_END
2030
2031 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2032 {
2033 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2034 JvmtiVMObjectAllocEventCollector oam;
2035 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2036 bounds_check(cp, index, CHECK_NULL);
2037 constantTag tag = cp->tag_at(index);
2038 if (!tag.is_field_or_method()) {
2039 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2040 }
2041 int klass_ref = cp->uncached_klass_ref_index_at(index);
2042 Symbol* klass_name = cp->klass_name_at(klass_ref);
2043 Symbol* member_name = cp->uncached_name_ref_at(index);
2044 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2045 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2046 objArrayHandle dest(THREAD, dest_o);
2047 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2048 dest->obj_at_put(0, str());
2049 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2050 dest->obj_at_put(1, str());
2051 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2052 dest->obj_at_put(2, str());
2053 return (jobjectArray) JNIHandles::make_local(dest());
2054 }
2055 JVM_END
2056
2057 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2058 {
2059 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2060 JvmtiVMObjectAllocEventCollector oam;
2061 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2062 bounds_check(cp, index, CHECK_0);
2063 constantTag tag = cp->tag_at(index);
2064 if (!tag.is_field_or_method()) {
2065 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2066 }
2067 return (jint) cp->uncached_klass_ref_index_at(index);
2068 }
2069 JVM_END
2070
2071 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2072 {
2073 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2074 JvmtiVMObjectAllocEventCollector oam;
2075 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2076 bounds_check(cp, index, CHECK_0);
2077 constantTag tag = cp->tag_at(index);
2078 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2079 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2080 }
2081 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2082 }
2083 JVM_END
2084
2085 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2086 {
2087 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2088 JvmtiVMObjectAllocEventCollector oam;
2089 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2090 bounds_check(cp, index, CHECK_NULL);
2091 constantTag tag = cp->tag_at(index);
2092 if (!tag.is_name_and_type()) {
2093 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2094 }
2095 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2096 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2097 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2098 objArrayHandle dest(THREAD, dest_o);
2099 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2100 dest->obj_at_put(0, str());
2101 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2102 dest->obj_at_put(1, str());
2103 return (jobjectArray) JNIHandles::make_local(dest());
2104 }
2105 JVM_END
2106
2107 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2108 {
2109 JVMWrapper("JVM_ConstantPoolGetIntAt");
2110 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2111 bounds_check(cp, index, CHECK_0);
2112 constantTag tag = cp->tag_at(index);
2113 if (!tag.is_int()) {
2114 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2115 }
2116 return cp->int_at(index);
2117 }
2118 JVM_END
2119
2120 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2121 {
2122 JVMWrapper("JVM_ConstantPoolGetLongAt");
2123 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2124 bounds_check(cp, index, CHECK_(0L));
2125 constantTag tag = cp->tag_at(index);
2126 if (!tag.is_long()) {
2127 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2128 }
2129 return cp->long_at(index);
2130 }
2131 JVM_END
2132
2133 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2134 {
2135 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2136 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2137 bounds_check(cp, index, CHECK_(0.0f));
2138 constantTag tag = cp->tag_at(index);
2139 if (!tag.is_float()) {
2140 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2141 }
2142 return cp->float_at(index);
2143 }
2144 JVM_END
2145
2146 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2147 {
2148 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2149 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2150 bounds_check(cp, index, CHECK_(0.0));
2151 constantTag tag = cp->tag_at(index);
2152 if (!tag.is_double()) {
2153 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2154 }
2155 return cp->double_at(index);
2156 }
2157 JVM_END
2158
2159 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2160 {
2161 JVMWrapper("JVM_ConstantPoolGetStringAt");
2162 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2163 bounds_check(cp, index, CHECK_NULL);
2164 constantTag tag = cp->tag_at(index);
2165 if (!tag.is_string()) {
2166 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2167 }
2168 oop str = cp->string_at(index, CHECK_NULL);
2169 return (jstring) JNIHandles::make_local(str);
2170 }
2171 JVM_END
2172
2173 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2174 {
2175 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2176 JvmtiVMObjectAllocEventCollector oam;
2177 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2178 bounds_check(cp, index, CHECK_NULL);
2179 constantTag tag = cp->tag_at(index);
2180 if (!tag.is_symbol()) {
2181 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2182 }
2183 Symbol* sym = cp->symbol_at(index);
2184 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2185 return (jstring) JNIHandles::make_local(str());
2186 }
2187 JVM_END
2188
2189 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2190 {
2191 JVMWrapper("JVM_ConstantPoolGetTagAt");
2192 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2193 bounds_check(cp, index, CHECK_0);
2194 constantTag tag = cp->tag_at(index);
2195 jbyte result = tag.value();
2196 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2197 // they are changed to the corresponding tags from the JVM spec, so that java code in
2198 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2199 if (tag.is_klass_or_reference()) {
2200 result = JVM_CONSTANT_Class;
2201 } else if (tag.is_string_index()) {
2202 result = JVM_CONSTANT_String;
2203 } else if (tag.is_method_type_in_error()) {
2204 result = JVM_CONSTANT_MethodType;
2205 } else if (tag.is_method_handle_in_error()) {
2206 result = JVM_CONSTANT_MethodHandle;
2207 } else if (tag.is_dynamic_constant_in_error()) {
2208 result = JVM_CONSTANT_Dynamic;
2209 }
2210 return result;
2211 }
2212 JVM_END
2213
2214 // Assertion support. //////////////////////////////////////////////////////////
2215
2216 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2217 JVMWrapper("JVM_DesiredAssertionStatus");
2218 assert(cls != NULL, "bad class");
2219
2220 oop r = JNIHandles::resolve(cls);
2221 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2222 if (java_lang_Class::is_primitive(r)) return false;
2223
2224 Klass* k = java_lang_Class::as_Klass(r);
2225 assert(k->is_instance_klass(), "must be an instance klass");
2226 if (!k->is_instance_klass()) return false;
2227
2228 ResourceMark rm(THREAD);
2229 const char* name = k->name()->as_C_string();
2230 bool system_class = k->class_loader() == NULL;
2231 return JavaAssertions::enabled(name, system_class);
2232
2233 JVM_END
2234
2235
2236 // Return a new AssertionStatusDirectives object with the fields filled in with
2237 // command-line assertion arguments (i.e., -ea, -da).
2238 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2239 JVMWrapper("JVM_AssertionStatusDirectives");
2240 JvmtiVMObjectAllocEventCollector oam;
2241 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2242 return JNIHandles::make_local(env, asd);
2243 JVM_END
2244
2245 // Verification ////////////////////////////////////////////////////////////////////////////////
2246
2247 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2248
2249 // RedefineClasses support: bug 6214132 caused verification to fail.
2250 // All functions from this section should call the jvmtiThreadSate function:
2251 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2252 // The function returns a Klass* of the _scratch_class if the verifier
2253 // was invoked in the middle of the class redefinition.
2254 // Otherwise it returns its argument value which is the _the_class Klass*.
2255 // Please, refer to the description in the jvmtiThreadSate.hpp.
2256
2257 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2258 JVMWrapper("JVM_GetClassNameUTF");
2259 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2260 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2261 return k->name()->as_utf8();
2262 JVM_END
2263
2264
2265 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2266 JVMWrapper("JVM_GetClassCPTypes");
2267 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2268 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2269 // types will have length zero if this is not an InstanceKlass
2270 // (length is determined by call to JVM_GetClassCPEntriesCount)
2271 if (k->is_instance_klass()) {
2272 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2273 for (int index = cp->length() - 1; index >= 0; index--) {
2274 constantTag tag = cp->tag_at(index);
2275 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2276 }
2277 }
2278 JVM_END
2279
2280
2281 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2282 JVMWrapper("JVM_GetClassCPEntriesCount");
2283 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2284 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2285 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2286 JVM_END
2287
2288
2289 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2290 JVMWrapper("JVM_GetClassFieldsCount");
2291 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2292 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2293 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2294 JVM_END
2295
2296
2297 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2298 JVMWrapper("JVM_GetClassMethodsCount");
2299 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2300 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2301 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2302 JVM_END
2303
2304
2305 // The following methods, used for the verifier, are never called with
2306 // array klasses, so a direct cast to InstanceKlass is safe.
2307 // Typically, these methods are called in a loop with bounds determined
2308 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2309 // zero for arrays.
2310 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2311 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2312 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2313 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2314 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2315 int length = method->checked_exceptions_length();
2316 if (length > 0) {
2317 CheckedExceptionElement* table= method->checked_exceptions_start();
2318 for (int i = 0; i < length; i++) {
2319 exceptions[i] = table[i].class_cp_index;
2320 }
2321 }
2322 JVM_END
2323
2324
2325 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2326 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2327 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2328 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2329 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2330 return method->checked_exceptions_length();
2331 JVM_END
2332
2333
2334 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2335 JVMWrapper("JVM_GetMethodIxByteCode");
2336 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2337 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2338 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2339 memcpy(code, method->code_base(), method->code_size());
2340 JVM_END
2341
2342
2343 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2344 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2345 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2346 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2347 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2348 return method->code_size();
2349 JVM_END
2350
2351
2352 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2353 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2354 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2355 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2356 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2357 ExceptionTable extable(method);
2358 entry->start_pc = extable.start_pc(entry_index);
2359 entry->end_pc = extable.end_pc(entry_index);
2360 entry->handler_pc = extable.handler_pc(entry_index);
2361 entry->catchType = extable.catch_type_index(entry_index);
2362 JVM_END
2363
2364
2365 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2366 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2367 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2368 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2369 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2370 return method->exception_table_length();
2371 JVM_END
2372
2373
2374 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2375 JVMWrapper("JVM_GetMethodIxModifiers");
2376 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2377 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2378 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2379 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2380 JVM_END
2381
2382
2383 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2384 JVMWrapper("JVM_GetFieldIxModifiers");
2385 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2386 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2387 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2388 JVM_END
2389
2390
2391 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2392 JVMWrapper("JVM_GetMethodIxLocalsCount");
2393 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2394 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2395 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2396 return method->max_locals();
2397 JVM_END
2398
2399
2400 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2401 JVMWrapper("JVM_GetMethodIxArgsSize");
2402 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2403 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2404 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2405 return method->size_of_parameters();
2406 JVM_END
2407
2408
2409 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2410 JVMWrapper("JVM_GetMethodIxMaxStack");
2411 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2412 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2413 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2414 return method->verifier_max_stack();
2415 JVM_END
2416
2417
2418 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2419 JVMWrapper("JVM_IsConstructorIx");
2420 ResourceMark rm(THREAD);
2421 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2422 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2423 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2424 return method->name() == vmSymbols::object_initializer_name();
2425 JVM_END
2426
2427
2428 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2429 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2430 ResourceMark rm(THREAD);
2431 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2432 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2433 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2434 return method->is_overpass();
2435 JVM_END
2436
2437 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2438 JVMWrapper("JVM_GetMethodIxIxUTF");
2439 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2440 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2441 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2442 return method->name()->as_utf8();
2443 JVM_END
2444
2445
2446 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2447 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2448 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2449 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2450 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2451 return method->signature()->as_utf8();
2452 JVM_END
2453
2454 /**
2455 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2456 * read entries in the constant pool. Since the old verifier always
2457 * works on a copy of the code, it will not see any rewriting that
2458 * may possibly occur in the middle of verification. So it is important
2459 * that nothing it calls tries to use the cpCache instead of the raw
2460 * constant pool, so we must use cp->uncached_x methods when appropriate.
2461 */
2462 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2463 JVMWrapper("JVM_GetCPFieldNameUTF");
2464 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2465 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2466 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2467 switch (cp->tag_at(cp_index).value()) {
2468 case JVM_CONSTANT_Fieldref:
2469 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2470 default:
2471 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2472 }
2473 ShouldNotReachHere();
2474 return NULL;
2475 JVM_END
2476
2477
2478 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2479 JVMWrapper("JVM_GetCPMethodNameUTF");
2480 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2481 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2482 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2483 switch (cp->tag_at(cp_index).value()) {
2484 case JVM_CONSTANT_InterfaceMethodref:
2485 case JVM_CONSTANT_Methodref:
2486 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2487 default:
2488 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2489 }
2490 ShouldNotReachHere();
2491 return NULL;
2492 JVM_END
2493
2494
2495 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2496 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2497 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2498 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2499 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2500 switch (cp->tag_at(cp_index).value()) {
2501 case JVM_CONSTANT_InterfaceMethodref:
2502 case JVM_CONSTANT_Methodref:
2503 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2504 default:
2505 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2506 }
2507 ShouldNotReachHere();
2508 return NULL;
2509 JVM_END
2510
2511
2512 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2513 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2514 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2515 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2516 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2517 switch (cp->tag_at(cp_index).value()) {
2518 case JVM_CONSTANT_Fieldref:
2519 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2520 default:
2521 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2522 }
2523 ShouldNotReachHere();
2524 return NULL;
2525 JVM_END
2526
2527
2528 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2529 JVMWrapper("JVM_GetCPClassNameUTF");
2530 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2531 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2532 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2533 Symbol* classname = cp->klass_name_at(cp_index);
2534 return classname->as_utf8();
2535 JVM_END
2536
2537
2538 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2539 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2540 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2541 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2542 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2543 switch (cp->tag_at(cp_index).value()) {
2544 case JVM_CONSTANT_Fieldref: {
2545 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2546 Symbol* classname = cp->klass_name_at(class_index);
2547 return classname->as_utf8();
2548 }
2549 default:
2550 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2551 }
2552 ShouldNotReachHere();
2553 return NULL;
2554 JVM_END
2555
2556
2557 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2558 JVMWrapper("JVM_GetCPMethodClassNameUTF");
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_Methodref:
2564 case JVM_CONSTANT_InterfaceMethodref: {
2565 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2566 Symbol* classname = cp->klass_name_at(class_index);
2567 return classname->as_utf8();
2568 }
2569 default:
2570 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2571 }
2572 ShouldNotReachHere();
2573 return NULL;
2574 JVM_END
2575
2576
2577 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2578 JVMWrapper("JVM_GetCPFieldModifiers");
2579 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2580 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2581 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2582 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2583 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2584 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2585 switch (cp->tag_at(cp_index).value()) {
2586 case JVM_CONSTANT_Fieldref: {
2587 Symbol* name = cp->uncached_name_ref_at(cp_index);
2588 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2589 InstanceKlass* ik = InstanceKlass::cast(k_called);
2590 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2591 if (fs.name() == name && fs.signature() == signature) {
2592 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2593 }
2594 }
2595 return -1;
2596 }
2597 default:
2598 fatal("JVM_GetCPFieldModifiers: illegal constant");
2599 }
2600 ShouldNotReachHere();
2601 return 0;
2602 JVM_END
2603
2604
2605 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2606 JVMWrapper("JVM_GetCPMethodModifiers");
2607 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2608 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2609 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2610 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2611 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2612 switch (cp->tag_at(cp_index).value()) {
2613 case JVM_CONSTANT_Methodref:
2614 case JVM_CONSTANT_InterfaceMethodref: {
2615 Symbol* name = cp->uncached_name_ref_at(cp_index);
2616 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2617 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2618 int methods_count = methods->length();
2619 for (int i = 0; i < methods_count; i++) {
2620 Method* method = methods->at(i);
2621 if (method->name() == name && method->signature() == signature) {
2622 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2623 }
2624 }
2625 return -1;
2626 }
2627 default:
2628 fatal("JVM_GetCPMethodModifiers: illegal constant");
2629 }
2630 ShouldNotReachHere();
2631 return 0;
2632 JVM_END
2633
2634
2635 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2636
2637 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2638 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2639 JVM_END
2640
2641
2642 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2643 JVMWrapper("JVM_IsSameClassPackage");
2644 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2645 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2646 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2647 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2648 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2649 JVM_END
2650
2651 // Printing support //////////////////////////////////////////////////
2652 extern "C" {
2653
2654 ATTRIBUTE_PRINTF(3, 0)
2655 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2656 // Reject count values that are negative signed values converted to
2657 // unsigned; see bug 4399518, 4417214
2658 if ((intptr_t)count <= 0) return -1;
2659
2660 int result = os::vsnprintf(str, count, fmt, args);
2661 if (result > 0 && (size_t)result >= count) {
2662 result = -1;
2663 }
2664
2665 return result;
2666 }
2667
2668 ATTRIBUTE_PRINTF(3, 4)
2669 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2670 va_list args;
2671 int len;
2672 va_start(args, fmt);
2673 len = jio_vsnprintf(str, count, fmt, args);
2674 va_end(args);
2675 return len;
2676 }
2677
2678 ATTRIBUTE_PRINTF(2, 3)
2679 int jio_fprintf(FILE* f, const char *fmt, ...) {
2680 int len;
2681 va_list args;
2682 va_start(args, fmt);
2683 len = jio_vfprintf(f, fmt, args);
2684 va_end(args);
2685 return len;
2686 }
2687
2688 ATTRIBUTE_PRINTF(2, 0)
2689 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2690 if (Arguments::vfprintf_hook() != NULL) {
2691 return Arguments::vfprintf_hook()(f, fmt, args);
2692 } else {
2693 return vfprintf(f, fmt, args);
2694 }
2695 }
2696
2697 ATTRIBUTE_PRINTF(1, 2)
2698 JNIEXPORT int jio_printf(const char *fmt, ...) {
2699 int len;
2700 va_list args;
2701 va_start(args, fmt);
2702 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2703 va_end(args);
2704 return len;
2705 }
2706
2707 // HotSpot specific jio method
2708 void jio_print(const char* s, size_t len) {
2709 // Try to make this function as atomic as possible.
2710 if (Arguments::vfprintf_hook() != NULL) {
2711 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2712 } else {
2713 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2714 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2715 }
2716 }
2717
2718 } // Extern C
2719
2720 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2721
2722 // In most of the JVM thread support functions we need to access the
2723 // thread through a ThreadsListHandle to prevent it from exiting and
2724 // being reclaimed while we try to operate on it. The exceptions to this
2725 // rule are when operating on the current thread, or if the monitor of
2726 // the target java.lang.Thread is locked at the Java level - in both
2727 // cases the target cannot exit.
2728
2729 static void thread_entry(JavaThread* thread, TRAPS) {
2730 HandleMark hm(THREAD);
2731 Handle obj(THREAD, thread->threadObj());
2732 JavaValue result(T_VOID);
2733 JavaCalls::call_virtual(&result,
2734 obj,
2735 SystemDictionary::Thread_klass(),
2736 vmSymbols::run_method_name(),
2737 vmSymbols::void_method_signature(),
2738 THREAD);
2739 }
2740
2741
2742 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2743 JVMWrapper("JVM_StartThread");
2744 JavaThread *native_thread = NULL;
2745
2746 // We cannot hold the Threads_lock when we throw an exception,
2747 // due to rank ordering issues. Example: we might need to grab the
2748 // Heap_lock while we construct the exception.
2749 bool throw_illegal_thread_state = false;
2750
2751 // We must release the Threads_lock before we can post a jvmti event
2752 // in Thread::start.
2753 {
2754 // Ensure that the C++ Thread and OSThread structures aren't freed before
2755 // we operate.
2756 MutexLocker mu(Threads_lock);
2757
2758 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2759 // re-starting an already started thread, so we should usually find
2760 // that the JavaThread is null. However for a JNI attached thread
2761 // there is a small window between the Thread object being created
2762 // (with its JavaThread set) and the update to its threadStatus, so we
2763 // have to check for this
2764 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2765 throw_illegal_thread_state = true;
2766 } else {
2767 // We could also check the stillborn flag to see if this thread was already stopped, but
2768 // for historical reasons we let the thread detect that itself when it starts running
2769
2770 jlong size =
2771 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2772 // Allocate the C++ Thread structure and create the native thread. The
2773 // stack size retrieved from java is 64-bit signed, but the constructor takes
2774 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2775 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2776 // - Avoid passing negative values which would result in really large stacks.
2777 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2778 size_t sz = size > 0 ? (size_t) size : 0;
2779 native_thread = new JavaThread(&thread_entry, sz);
2780
2781 // At this point it may be possible that no osthread was created for the
2782 // JavaThread due to lack of memory. Check for this situation and throw
2783 // an exception if necessary. Eventually we may want to change this so
2784 // that we only grab the lock if the thread was created successfully -
2785 // then we can also do this check and throw the exception in the
2786 // JavaThread constructor.
2787 if (native_thread->osthread() != NULL) {
2788 // Note: the current thread is not being used within "prepare".
2789 native_thread->prepare(jthread);
2790 }
2791 }
2792 }
2793
2794 if (throw_illegal_thread_state) {
2795 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2796 }
2797
2798 assert(native_thread != NULL, "Starting null thread?");
2799
2800 if (native_thread->osthread() == NULL) {
2801 // No one should hold a reference to the 'native_thread'.
2802 native_thread->smr_delete();
2803 if (JvmtiExport::should_post_resource_exhausted()) {
2804 JvmtiExport::post_resource_exhausted(
2805 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2806 os::native_thread_creation_failed_msg());
2807 }
2808 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2809 os::native_thread_creation_failed_msg());
2810 }
2811
2812 Thread::start(native_thread);
2813
2814 JVM_END
2815
2816
2817 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2818 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2819 // but is thought to be reliable and simple. In the case, where the receiver is the
2820 // same thread as the sender, no VM_Operation is needed.
2821 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2822 JVMWrapper("JVM_StopThread");
2823
2824 // A nested ThreadsListHandle will grab the Threads_lock so create
2825 // tlh before we resolve throwable.
2826 ThreadsListHandle tlh(thread);
2827 oop java_throwable = JNIHandles::resolve(throwable);
2828 if (java_throwable == NULL) {
2829 THROW(vmSymbols::java_lang_NullPointerException());
2830 }
2831 oop java_thread = NULL;
2832 JavaThread* receiver = NULL;
2833 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2834 Events::log_exception(thread,
2835 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2836 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2837
2838 if (is_alive) {
2839 // jthread refers to a live JavaThread.
2840 if (thread == receiver) {
2841 // Exception is getting thrown at self so no VM_Operation needed.
2842 THROW_OOP(java_throwable);
2843 } else {
2844 // Use a VM_Operation to throw the exception.
2845 Thread::send_async_exception(java_thread, java_throwable);
2846 }
2847 } else {
2848 // Either:
2849 // - target thread has not been started before being stopped, or
2850 // - target thread already terminated
2851 // We could read the threadStatus to determine which case it is
2852 // but that is overkill as it doesn't matter. We must set the
2853 // stillborn flag for the first case, and if the thread has already
2854 // exited setting this flag has no effect.
2855 java_lang_Thread::set_stillborn(java_thread);
2856 }
2857 JVM_END
2858
2859
2860 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2861 JVMWrapper("JVM_IsThreadAlive");
2862
2863 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2864 return java_lang_Thread::is_alive(thread_oop);
2865 JVM_END
2866
2867
2868 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2869 JVMWrapper("JVM_SuspendThread");
2870
2871 ThreadsListHandle tlh(thread);
2872 JavaThread* receiver = NULL;
2873 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2874 if (is_alive) {
2875 // jthread refers to a live JavaThread.
2876 {
2877 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2878 if (receiver->is_external_suspend()) {
2879 // Don't allow nested external suspend requests. We can't return
2880 // an error from this interface so just ignore the problem.
2881 return;
2882 }
2883 if (receiver->is_exiting()) { // thread is in the process of exiting
2884 return;
2885 }
2886 receiver->set_external_suspend();
2887 }
2888
2889 // java_suspend() will catch threads in the process of exiting
2890 // and will ignore them.
2891 receiver->java_suspend();
2892
2893 // It would be nice to have the following assertion in all the
2894 // time, but it is possible for a racing resume request to have
2895 // resumed this thread right after we suspended it. Temporarily
2896 // enable this assertion if you are chasing a different kind of
2897 // bug.
2898 //
2899 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2900 // receiver->is_being_ext_suspended(), "thread is not suspended");
2901 }
2902 JVM_END
2903
2904
2905 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2906 JVMWrapper("JVM_ResumeThread");
2907
2908 ThreadsListHandle tlh(thread);
2909 JavaThread* receiver = NULL;
2910 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2911 if (is_alive) {
2912 // jthread refers to a live JavaThread.
2913
2914 // This is the original comment for this Threads_lock grab:
2915 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2916 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2917 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2918 // looks at it.
2919 //
2920 // The above comment dates back to when we had both internal and
2921 // external suspend APIs that shared a common underlying mechanism.
2922 // External suspend is now entirely cooperative and doesn't share
2923 // anything with internal suspend. That said, there are some
2924 // assumptions in the VM that an external resume grabs the
2925 // Threads_lock. We can't drop the Threads_lock grab here until we
2926 // resolve the assumptions that exist elsewhere.
2927 //
2928 MutexLocker ml(Threads_lock);
2929 receiver->java_resume();
2930 }
2931 JVM_END
2932
2933
2934 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2935 JVMWrapper("JVM_SetThreadPriority");
2936
2937 ThreadsListHandle tlh(thread);
2938 oop java_thread = NULL;
2939 JavaThread* receiver = NULL;
2940 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2941 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2942
2943 if (is_alive) {
2944 // jthread refers to a live JavaThread.
2945 Thread::set_priority(receiver, (ThreadPriority)prio);
2946 }
2947 // Implied else: If the JavaThread hasn't started yet, then the
2948 // priority set in the java.lang.Thread object above will be pushed
2949 // down when it does start.
2950 JVM_END
2951
2952
2953 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2954 JVMWrapper("JVM_Yield");
2955 if (os::dont_yield()) return;
2956 HOTSPOT_THREAD_YIELD();
2957 os::naked_yield();
2958 JVM_END
2959
2960 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
2961 assert(event != NULL, "invariant");
2962 assert(event->should_commit(), "invariant");
2963 event->set_time(millis);
2964 event->commit();
2965 }
2966
2967 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2968 JVMWrapper("JVM_Sleep");
2969
2970 if (millis < 0) {
2971 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2972 }
2973
2974 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2975 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2976 }
2977
2978 // Save current thread state and restore it at the end of this block.
2979 // And set new thread state to SLEEPING.
2980 JavaThreadSleepState jtss(thread);
2981
2982 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2983 EventThreadSleep event;
2984
2985 if (millis == 0) {
2986 os::naked_yield();
2987 } else {
2988 ThreadState old_state = thread->osthread()->get_state();
2989 thread->osthread()->set_state(SLEEPING);
2990 if (os::sleep(thread, millis, true) == OS_INTRPT) {
2991 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
2992 // us while we were sleeping. We do not overwrite those.
2993 if (!HAS_PENDING_EXCEPTION) {
2994 if (event.should_commit()) {
2995 post_thread_sleep_event(&event, millis);
2996 }
2997 HOTSPOT_THREAD_SLEEP_END(1);
2998
2999 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3000 // to properly restore the thread state. That's likely wrong.
3001 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3002 }
3003 }
3004 thread->osthread()->set_state(old_state);
3005 }
3006 if (event.should_commit()) {
3007 post_thread_sleep_event(&event, millis);
3008 }
3009 HOTSPOT_THREAD_SLEEP_END(0);
3010 JVM_END
3011
3012 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3013 JVMWrapper("JVM_CurrentThread");
3014 oop jthread = thread->threadObj();
3015 assert (thread != NULL, "no current thread!");
3016 return JNIHandles::make_local(env, jthread);
3017 JVM_END
3018
3019
3020 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3021 JVMWrapper("JVM_CountStackFrames");
3022
3023 uint32_t debug_bits = 0;
3024 ThreadsListHandle tlh(thread);
3025 JavaThread* receiver = NULL;
3026 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3027 int count = 0;
3028 if (is_alive) {
3029 // jthread refers to a live JavaThread.
3030 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
3031 // Count all java activation, i.e., number of vframes.
3032 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) {
3033 // Native frames are not counted.
3034 if (!vfst.method()->is_native()) count++;
3035 }
3036 } else {
3037 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3038 "this thread is not suspended");
3039 }
3040 }
3041 // Implied else: if JavaThread is not alive simply return a count of 0.
3042
3043 return count;
3044 JVM_END
3045
3046
3047 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3048 JVMWrapper("JVM_Interrupt");
3049
3050 ThreadsListHandle tlh(thread);
3051 JavaThread* receiver = NULL;
3052 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3053 if (is_alive) {
3054 // jthread refers to a live JavaThread.
3055 Thread::interrupt(receiver);
3056 }
3057 JVM_END
3058
3059
3060 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3061 JVMWrapper("JVM_IsInterrupted");
3062
3063 ThreadsListHandle tlh(thread);
3064 JavaThread* receiver = NULL;
3065 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3066 if (is_alive) {
3067 // jthread refers to a live JavaThread.
3068 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3069 } else {
3070 return JNI_FALSE;
3071 }
3072 JVM_END
3073
3074
3075 // Return true iff the current thread has locked the object passed in
3076
3077 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3078 JVMWrapper("JVM_HoldsLock");
3079 assert(THREAD->is_Java_thread(), "sanity check");
3080 if (obj == NULL) {
3081 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3082 }
3083 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3084 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3085 JVM_END
3086
3087
3088 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3089 JVMWrapper("JVM_DumpAllStacks");
3090 VM_PrintThreads op;
3091 VMThread::execute(&op);
3092 if (JvmtiExport::should_post_data_dump()) {
3093 JvmtiExport::post_data_dump();
3094 }
3095 JVM_END
3096
3097 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3098 JVMWrapper("JVM_SetNativeThreadName");
3099
3100 // We don't use a ThreadsListHandle here because the current thread
3101 // must be alive.
3102 oop java_thread = JNIHandles::resolve_non_null(jthread);
3103 JavaThread* thr = java_lang_Thread::thread(java_thread);
3104 if (thread == thr && !thr->has_attached_via_jni()) {
3105 // Thread naming is only supported for the current thread and
3106 // we don't set the name of an attached thread to avoid stepping
3107 // on other programs.
3108 ResourceMark rm(thread);
3109 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3110 os::set_native_thread_name(thread_name);
3111 }
3112 JVM_END
3113
3114 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3115
3116 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3117 JVMWrapper("JVM_GetClassContext");
3118 ResourceMark rm(THREAD);
3119 JvmtiVMObjectAllocEventCollector oam;
3120 vframeStream vfst(thread);
3121
3122 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3123 // This must only be called from SecurityManager.getClassContext
3124 Method* m = vfst.method();
3125 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3126 m->name() == vmSymbols::getClassContext_name() &&
3127 m->signature() == vmSymbols::void_class_array_signature())) {
3128 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3129 }
3130 }
3131
3132 // Collect method holders
3133 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3134 for (; !vfst.at_end(); vfst.security_next()) {
3135 Method* m = vfst.method();
3136 // Native frames are not returned
3137 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3138 Klass* holder = m->method_holder();
3139 assert(holder->is_klass(), "just checking");
3140 klass_array->append(holder);
3141 }
3142 }
3143
3144 // Create result array of type [Ljava/lang/Class;
3145 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3146 // Fill in mirrors corresponding to method holders
3147 for (int i = 0; i < klass_array->length(); i++) {
3148 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3149 }
3150
3151 return (jobjectArray) JNIHandles::make_local(env, result);
3152 JVM_END
3153
3154
3155 // java.lang.Package ////////////////////////////////////////////////////////////////
3156
3157
3158 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3159 JVMWrapper("JVM_GetSystemPackage");
3160 ResourceMark rm(THREAD);
3161 JvmtiVMObjectAllocEventCollector oam;
3162 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3163 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3164 return (jstring) JNIHandles::make_local(result);
3165 JVM_END
3166
3167
3168 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3169 JVMWrapper("JVM_GetSystemPackages");
3170 JvmtiVMObjectAllocEventCollector oam;
3171 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3172 return (jobjectArray) JNIHandles::make_local(result);
3173 JVM_END
3174
3175
3176 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3177
3178
3179 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3180 JVMWrapper("JVM_GetAndClearReferencePendingList");
3181
3182 MonitorLockerEx ml(Heap_lock);
3183 oop ref = Universe::reference_pending_list();
3184 if (ref != NULL) {
3185 Universe::set_reference_pending_list(NULL);
3186 }
3187 return JNIHandles::make_local(env, ref);
3188 JVM_END
3189
3190 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3191 JVMWrapper("JVM_HasReferencePendingList");
3192 MonitorLockerEx ml(Heap_lock);
3193 return Universe::has_reference_pending_list();
3194 JVM_END
3195
3196 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3197 JVMWrapper("JVM_WaitForReferencePendingList");
3198 MonitorLockerEx ml(Heap_lock);
3199 while (!Universe::has_reference_pending_list()) {
3200 ml.wait();
3201 }
3202 JVM_END
3203
3204
3205 // ObjectInputStream ///////////////////////////////////////////////////////////////
3206
3207 // Return the first user-defined class loader up the execution stack, or null
3208 // if only code from the bootstrap or platform class loader is on the stack.
3209
3210 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3211 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3212 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3213 oop loader = vfst.method()->method_holder()->class_loader();
3214 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3215 return JNIHandles::make_local(env, loader);
3216 }
3217 }
3218 return NULL;
3219 JVM_END
3220
3221
3222 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3223
3224
3225 // resolve array handle and check arguments
3226 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3227 if (arr == NULL) {
3228 THROW_0(vmSymbols::java_lang_NullPointerException());
3229 }
3230 oop a = JNIHandles::resolve_non_null(arr);
3231 if (!a->is_array()) {
3232 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3233 } else if (type_array_only && !a->is_typeArray()) {
3234 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3235 }
3236 return arrayOop(a);
3237 }
3238
3239
3240 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3241 JVMWrapper("JVM_GetArrayLength");
3242 arrayOop a = check_array(env, arr, false, CHECK_0);
3243 return a->length();
3244 JVM_END
3245
3246
3247 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3248 JVMWrapper("JVM_Array_Get");
3249 JvmtiVMObjectAllocEventCollector oam;
3250 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3251 jvalue value;
3252 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3253 oop box = Reflection::box(&value, type, CHECK_NULL);
3254 return JNIHandles::make_local(env, box);
3255 JVM_END
3256
3257
3258 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3259 JVMWrapper("JVM_GetPrimitiveArrayElement");
3260 jvalue value;
3261 value.i = 0; // to initialize value before getting used in CHECK
3262 arrayOop a = check_array(env, arr, true, CHECK_(value));
3263 assert(a->is_typeArray(), "just checking");
3264 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3265 BasicType wide_type = (BasicType) wCode;
3266 if (type != wide_type) {
3267 Reflection::widen(&value, type, wide_type, CHECK_(value));
3268 }
3269 return value;
3270 JVM_END
3271
3272
3273 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3274 JVMWrapper("JVM_SetArrayElement");
3275 arrayOop a = check_array(env, arr, false, CHECK);
3276 oop box = JNIHandles::resolve(val);
3277 jvalue value;
3278 value.i = 0; // to initialize value before getting used in CHECK
3279 BasicType value_type;
3280 if (a->is_objArray()) {
3281 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3282 value_type = Reflection::unbox_for_regular_object(box, &value);
3283 } else {
3284 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3285 }
3286 Reflection::array_set(&value, a, index, value_type, CHECK);
3287 JVM_END
3288
3289
3290 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3291 JVMWrapper("JVM_SetPrimitiveArrayElement");
3292 arrayOop a = check_array(env, arr, true, CHECK);
3293 assert(a->is_typeArray(), "just checking");
3294 BasicType value_type = (BasicType) vCode;
3295 Reflection::array_set(&v, a, index, value_type, CHECK);
3296 JVM_END
3297
3298
3299 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3300 JVMWrapper("JVM_NewArray");
3301 JvmtiVMObjectAllocEventCollector oam;
3302 oop element_mirror = JNIHandles::resolve(eltClass);
3303 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3304 return JNIHandles::make_local(env, result);
3305 JVM_END
3306
3307
3308 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3309 JVMWrapper("JVM_NewMultiArray");
3310 JvmtiVMObjectAllocEventCollector oam;
3311 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3312 oop element_mirror = JNIHandles::resolve(eltClass);
3313 assert(dim_array->is_typeArray(), "just checking");
3314 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3315 return JNIHandles::make_local(env, result);
3316 JVM_END
3317
3318
3319 // Library support ///////////////////////////////////////////////////////////////////////////
3320
3321 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3322 //%note jvm_ct
3323 JVMWrapper("JVM_LoadLibrary");
3324 char ebuf[1024];
3325 void *load_result;
3326 {
3327 ThreadToNativeFromVM ttnfvm(thread);
3328 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3329 }
3330 if (load_result == NULL) {
3331 char msg[1024];
3332 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3333 // Since 'ebuf' may contain a string encoded using
3334 // platform encoding scheme, we need to pass
3335 // Exceptions::unsafe_to_utf8 to the new_exception method
3336 // as the last argument. See bug 6367357.
3337 Handle h_exception =
3338 Exceptions::new_exception(thread,
3339 vmSymbols::java_lang_UnsatisfiedLinkError(),
3340 msg, Exceptions::unsafe_to_utf8);
3341
3342 THROW_HANDLE_0(h_exception);
3343 }
3344 return load_result;
3345 JVM_END
3346
3347
3348 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3349 JVMWrapper("JVM_UnloadLibrary");
3350 os::dll_unload(handle);
3351 JVM_END
3352
3353
3354 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3355 JVMWrapper("JVM_FindLibraryEntry");
3356 return os::dll_lookup(handle, name);
3357 JVM_END
3358
3359
3360 // JNI version ///////////////////////////////////////////////////////////////////////////////
3361
3362 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3363 JVMWrapper("JVM_IsSupportedJNIVersion");
3364 return Threads::is_supported_jni_version_including_1_1(version);
3365 JVM_END
3366
3367
3368 // String support ///////////////////////////////////////////////////////////////////////////
3369
3370 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3371 JVMWrapper("JVM_InternString");
3372 JvmtiVMObjectAllocEventCollector oam;
3373 if (str == NULL) return NULL;
3374 oop string = JNIHandles::resolve_non_null(str);
3375 oop result = StringTable::intern(string, CHECK_NULL);
3376 return (jstring) JNIHandles::make_local(env, result);
3377 JVM_END
3378
3379
3380 // Raw monitor support //////////////////////////////////////////////////////////////////////
3381
3382 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3383 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3384 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3385 // that only works with java threads.
3386
3387
3388 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3389 VM_Exit::block_if_vm_exited();
3390 JVMWrapper("JVM_RawMonitorCreate");
3391 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3392 }
3393
3394
3395 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3396 VM_Exit::block_if_vm_exited();
3397 JVMWrapper("JVM_RawMonitorDestroy");
3398 delete ((Mutex*) mon);
3399 }
3400
3401
3402 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3403 VM_Exit::block_if_vm_exited();
3404 JVMWrapper("JVM_RawMonitorEnter");
3405 ((Mutex*) mon)->jvm_raw_lock();
3406 return 0;
3407 }
3408
3409
3410 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3411 VM_Exit::block_if_vm_exited();
3412 JVMWrapper("JVM_RawMonitorExit");
3413 ((Mutex*) mon)->jvm_raw_unlock();
3414 }
3415
3416
3417 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3418
3419 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3420 Handle loader, Handle protection_domain,
3421 jboolean throwError, TRAPS) {
3422 // Security Note:
3423 // The Java level wrapper will perform the necessary security check allowing
3424 // us to pass the NULL as the initiating class loader. The VM is responsible for
3425 // the checkPackageAccess relative to the initiating class loader via the
3426 // protection_domain. The protection_domain is passed as NULL by the java code
3427 // if there is no security manager in 3-arg Class.forName().
3428 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3429
3430 // Check if we should initialize the class
3431 if (init && klass->is_instance_klass()) {
3432 klass->initialize(CHECK_NULL);
3433 }
3434 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3435 }
3436
3437
3438 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3439
3440 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3441 JVMWrapper("JVM_InvokeMethod");
3442 Handle method_handle;
3443 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3444 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3445 Handle receiver(THREAD, JNIHandles::resolve(obj));
3446 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3447 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3448 jobject res = JNIHandles::make_local(env, result);
3449 if (JvmtiExport::should_post_vm_object_alloc()) {
3450 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3451 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3452 if (java_lang_Class::is_primitive(ret_type)) {
3453 // Only for primitive type vm allocates memory for java object.
3454 // See box() method.
3455 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3456 }
3457 }
3458 return res;
3459 } else {
3460 THROW_0(vmSymbols::java_lang_StackOverflowError());
3461 }
3462 JVM_END
3463
3464
3465 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3466 JVMWrapper("JVM_NewInstanceFromConstructor");
3467 oop constructor_mirror = JNIHandles::resolve(c);
3468 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3469 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3470 jobject res = JNIHandles::make_local(env, result);
3471 if (JvmtiExport::should_post_vm_object_alloc()) {
3472 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3473 }
3474 return res;
3475 JVM_END
3476
3477 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3478
3479 JVM_LEAF(jboolean, JVM_SupportsCX8())
3480 JVMWrapper("JVM_SupportsCX8");
3481 return VM_Version::supports_cx8();
3482 JVM_END
3483
3484 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3485 JVMWrapper("JVM_InitializeFromArchive");
3486 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3487 assert(k->is_klass(), "just checking");
3488 HeapShared::initialize_from_archived_subgraph(k);
3489 JVM_END
3490
3491 // Returns an array of all live Thread objects (VM internal JavaThreads,
3492 // jvmti agent threads, and JNI attaching threads are skipped)
3493 // See CR 6404306 regarding JNI attaching threads
3494 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3495 ResourceMark rm(THREAD);
3496 ThreadsListEnumerator tle(THREAD, false, false);
3497 JvmtiVMObjectAllocEventCollector oam;
3498
3499 int num_threads = tle.num_threads();
3500 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3501 objArrayHandle threads_ah(THREAD, r);
3502
3503 for (int i = 0; i < num_threads; i++) {
3504 Handle h = tle.get_threadObj(i);
3505 threads_ah->obj_at_put(i, h());
3506 }
3507
3508 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3509 JVM_END
3510
3511
3512 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3513 // Return StackTraceElement[][], each element is the stack trace of a thread in
3514 // the corresponding entry in the given threads array
3515 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3516 JVMWrapper("JVM_DumpThreads");
3517 JvmtiVMObjectAllocEventCollector oam;
3518
3519 // Check if threads is null
3520 if (threads == NULL) {
3521 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3522 }
3523
3524 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3525 objArrayHandle ah(THREAD, a);
3526 int num_threads = ah->length();
3527 // check if threads is non-empty array
3528 if (num_threads == 0) {
3529 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3530 }
3531
3532 // check if threads is not an array of objects of Thread class
3533 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3534 if (k != SystemDictionary::Thread_klass()) {
3535 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3536 }
3537
3538 ResourceMark rm(THREAD);
3539
3540 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3541 for (int i = 0; i < num_threads; i++) {
3542 oop thread_obj = ah->obj_at(i);
3543 instanceHandle h(THREAD, (instanceOop) thread_obj);
3544 thread_handle_array->append(h);
3545 }
3546
3547 // The JavaThread references in thread_handle_array are validated
3548 // in VM_ThreadDump::doit().
3549 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3550 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3551
3552 JVM_END
3553
3554 // JVM monitoring and management support
3555 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3556 return Management::get_jmm_interface(version);
3557 JVM_END
3558
3559 // com.sun.tools.attach.VirtualMachine agent properties support
3560 //
3561 // Initialize the agent properties with the properties maintained in the VM
3562 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3563 JVMWrapper("JVM_InitAgentProperties");
3564 ResourceMark rm;
3565
3566 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3567
3568 PUTPROP(props, "sun.java.command", Arguments::java_command());
3569 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3570 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3571 return properties;
3572 JVM_END
3573
3574 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3575 {
3576 JVMWrapper("JVM_GetEnclosingMethodInfo");
3577 JvmtiVMObjectAllocEventCollector oam;
3578
3579 if (ofClass == NULL) {
3580 return NULL;
3581 }
3582 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3583 // Special handling for primitive objects
3584 if (java_lang_Class::is_primitive(mirror())) {
3585 return NULL;
3586 }
3587 Klass* k = java_lang_Class::as_Klass(mirror());
3588 if (!k->is_instance_klass()) {
3589 return NULL;
3590 }
3591 InstanceKlass* ik = InstanceKlass::cast(k);
3592 int encl_method_class_idx = ik->enclosing_method_class_index();
3593 if (encl_method_class_idx == 0) {
3594 return NULL;
3595 }
3596 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3597 objArrayHandle dest(THREAD, dest_o);
3598 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3599 dest->obj_at_put(0, enc_k->java_mirror());
3600 int encl_method_method_idx = ik->enclosing_method_method_index();
3601 if (encl_method_method_idx != 0) {
3602 Symbol* sym = ik->constants()->symbol_at(
3603 extract_low_short_from_int(
3604 ik->constants()->name_and_type_at(encl_method_method_idx)));
3605 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3606 dest->obj_at_put(1, str());
3607 sym = ik->constants()->symbol_at(
3608 extract_high_short_from_int(
3609 ik->constants()->name_and_type_at(encl_method_method_idx)));
3610 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3611 dest->obj_at_put(2, str());
3612 }
3613 return (jobjectArray) JNIHandles::make_local(dest());
3614 }
3615 JVM_END
3616
3617 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3618 {
3619 memset(info, 0, info_size);
3620
3621 info->jvm_version = VM_Version::jvm_version();
3622 info->patch_version = VM_Version::vm_patch_version();
3623
3624 // when we add a new capability in the jvm_version_info struct, we should also
3625 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3626 // counter defined in runtimeService.cpp.
3627 info->is_attach_supported = AttachListener::is_attach_supported();
3628 }
3629 JVM_END
3630
3631 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3632 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3633 ResourceMark rm(THREAD);
3634
3635 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3636 return NULL;
3637 }
3638
3639 char** vm_flags = Arguments::jvm_flags_array();
3640 char** vm_args = Arguments::jvm_args_array();
3641 int num_flags = Arguments::num_jvm_flags();
3642 int num_args = Arguments::num_jvm_args();
3643
3644 InstanceKlass* ik = SystemDictionary::String_klass();
3645 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3646 objArrayHandle result_h(THREAD, r);
3647
3648 int index = 0;
3649 for (int j = 0; j < num_flags; j++, index++) {
3650 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3651 result_h->obj_at_put(index, h());
3652 }
3653 for (int i = 0; i < num_args; i++, index++) {
3654 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3655 result_h->obj_at_put(index, h());
3656 }
3657 return (jobjectArray) JNIHandles::make_local(env, result_h());
3658 JVM_END
3659
3660 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3661 return os::get_signal_number(name);
3662 JVM_END