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/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "gc/shared/collectedHeap.inline.hpp"
40 #include "interpreter/bytecode.hpp"
41 #include "jfr/jfrEvents.hpp"
42 #include "logging/log.hpp"
43 #include "memory/heapShared.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/referenceType.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "memory/universe.hpp"
48 #include "oops/access.inline.hpp"
49 #include "oops/constantPool.hpp"
50 #include "oops/fieldStreams.hpp"
51 #include "oops/instanceKlass.hpp"
52 #include "oops/method.hpp"
53 #include "oops/objArrayKlass.hpp"
54 #include "oops/objArrayOop.inline.hpp"
55 #include "oops/oop.inline.hpp"
56 #include "prims/jvm_misc.hpp"
57 #include "prims/jvmtiExport.hpp"
58 #include "prims/jvmtiThreadState.hpp"
59 #include "prims/nativeLookup.hpp"
60 #include "prims/stackwalk.hpp"
61 #include "runtime/arguments.hpp"
62 #include "runtime/atomic.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/init.hpp"
65 #include "runtime/interfaceSupport.inline.hpp"
66 #include "runtime/deoptimization.hpp"
67 #include "runtime/handshake.hpp"
68 #include "runtime/java.hpp"
69 #include "runtime/javaCalls.hpp"
70 #include "runtime/jfieldIDWorkaround.hpp"
71 #include "runtime/jniHandles.inline.hpp"
72 #include "runtime/orderAccess.hpp"
73 #include "runtime/os.inline.hpp"
74 #include "runtime/perfData.hpp"
75 #include "runtime/reflection.hpp"
76 #include "runtime/synchronizer.hpp"
77 #include "runtime/thread.inline.hpp"
78 #include "runtime/threadSMR.hpp"
79 #include "runtime/vframe.inline.hpp"
80 #include "runtime/vmOperations.hpp"
81 #include "runtime/vm_version.hpp"
82 #include "services/attachListener.hpp"
83 #include "services/management.hpp"
84 #include "services/threadService.hpp"
85 #include "utilities/copy.hpp"
86 #include "utilities/defaultStream.hpp"
87 #include "utilities/dtrace.hpp"
88 #include "utilities/events.hpp"
89 #include "utilities/histogram.hpp"
90 #include "utilities/macros.hpp"
91 #include "utilities/utf8.hpp"
92 #if INCLUDE_CDS
93 #include "classfile/systemDictionaryShared.hpp"
94 #endif
95
96 #include <errno.h>
97
98 /*
99 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
100 such ctors and calls MUST NOT come between an oop declaration/init and its
101 usage because if objects are move this may cause various memory stomps, bus
102 errors and segfaults. Here is a cookbook for causing so called "naked oop
103 failures":
104
105 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
106 JVMWrapper("JVM_GetClassDeclaredFields");
107
108 // Object address to be held directly in mirror & not visible to GC
109 oop mirror = JNIHandles::resolve_non_null(ofClass);
110
111 // If this ctor can hit a safepoint, moving objects around, then
112 ComplexConstructor foo;
113
114 // Boom! mirror may point to JUNK instead of the intended object
115 (some dereference of mirror)
116
117 // Here's another call that may block for GC, making mirror stale
118 MutexLocker ml(some_lock);
119
120 // And here's an initializer that can result in a stale oop
121 // all in one step.
122 oop o = call_that_can_throw_exception(TRAPS);
123
124
125 The solution is to keep the oop declaration BELOW the ctor or function
126 call that might cause a GC, do another resolve to reassign the oop, or
127 consider use of a Handle instead of an oop so there is immunity from object
128 motion. But note that the "QUICK" entries below do not have a handlemark
129 and thus can only support use of handles passed in.
130 */
131
132 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
133 ResourceMark rm;
134 int line_number = -1;
135 const char * source_file = NULL;
136 const char * trace = "explicit";
137 InstanceKlass* caller = NULL;
138 JavaThread* jthread = JavaThread::current();
139 if (jthread->has_last_Java_frame()) {
140 vframeStream vfst(jthread);
141
142 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
143 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
144 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
145 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
146 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
147
148 Method* last_caller = NULL;
149
150 while (!vfst.at_end()) {
151 Method* m = vfst.method();
152 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
153 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
154 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
155 break;
156 }
157 last_caller = m;
158 vfst.next();
159 }
160 // if this is called from Class.forName0 and that is called from Class.forName,
161 // then print the caller of Class.forName. If this is Class.loadClass, then print
162 // that caller, otherwise keep quiet since this should be picked up elsewhere.
163 bool found_it = false;
164 if (!vfst.at_end() &&
165 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
166 vfst.method()->name() == vmSymbols::forName0_name()) {
167 vfst.next();
168 if (!vfst.at_end() &&
169 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
170 vfst.method()->name() == vmSymbols::forName_name()) {
171 vfst.next();
172 found_it = true;
173 }
174 } else if (last_caller != NULL &&
175 last_caller->method_holder()->name() ==
176 vmSymbols::java_lang_ClassLoader() &&
177 last_caller->name() == vmSymbols::loadClass_name()) {
178 found_it = true;
179 } else if (!vfst.at_end()) {
180 if (vfst.method()->is_native()) {
181 // JNI call
182 found_it = true;
183 }
184 }
185 if (found_it && !vfst.at_end()) {
186 // found the caller
187 caller = vfst.method()->method_holder();
188 line_number = vfst.method()->line_number_from_bci(vfst.bci());
189 if (line_number == -1) {
190 // show method name if it's a native method
191 trace = vfst.method()->name_and_sig_as_C_string();
192 }
193 Symbol* s = caller->source_file_name();
194 if (s != NULL) {
195 source_file = s->as_C_string();
196 }
197 }
198 }
199 if (caller != NULL) {
200 if (to_class != caller) {
201 const char * from = caller->external_name();
202 const char * to = to_class->external_name();
203 // print in a single call to reduce interleaving between threads
204 if (source_file != NULL) {
205 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
206 } else {
207 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
208 }
209 }
210 }
211 }
212
213 void trace_class_resolution(Klass* to_class) {
214 EXCEPTION_MARK;
215 trace_class_resolution_impl(to_class, THREAD);
216 if (HAS_PENDING_EXCEPTION) {
217 CLEAR_PENDING_EXCEPTION;
218 }
219 }
220
221 // Wrapper to trace JVM functions
222
223 #ifdef ASSERT
224 Histogram* JVMHistogram;
225 volatile int JVMHistogram_lock = 0;
226
227 class JVMHistogramElement : public HistogramElement {
228 public:
229 JVMHistogramElement(const char* name);
230 };
231
232 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
233 _name = elementName;
234 uintx count = 0;
235
236 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
237 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
238 count +=1;
239 if ( (WarnOnStalledSpinLock > 0)
240 && (count % WarnOnStalledSpinLock == 0)) {
241 warning("JVMHistogram_lock seems to be stalled");
242 }
243 }
244 }
245
246 if(JVMHistogram == NULL)
247 JVMHistogram = new Histogram("JVM Call Counts",100);
248
249 JVMHistogram->add_element(this);
250 Atomic::dec(&JVMHistogram_lock);
251 }
252
253 #define JVMCountWrapper(arg) \
254 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
255 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
256
257 #define JVMWrapper(arg) JVMCountWrapper(arg);
258 #else
259 #define JVMWrapper(arg)
260 #endif
261
262
263 // Interface version /////////////////////////////////////////////////////////////////////
264
265
266 JVM_LEAF(jint, JVM_GetInterfaceVersion())
267 return JVM_INTERFACE_VERSION;
268 JVM_END
269
270
271 // java.lang.System //////////////////////////////////////////////////////////////////////
272
273
274 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
275 JVMWrapper("JVM_CurrentTimeMillis");
276 return os::javaTimeMillis();
277 JVM_END
278
279 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
280 JVMWrapper("JVM_NanoTime");
281 return os::javaTimeNanos();
282 JVM_END
283
284 // The function below is actually exposed by jdk.internal.misc.VM and not
285 // java.lang.System, but we choose to keep it here so that it stays next
286 // to JVM_CurrentTimeMillis and JVM_NanoTime
287
288 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
289 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
290
291 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
292 JVMWrapper("JVM_GetNanoTimeAdjustment");
293 jlong seconds;
294 jlong nanos;
295
296 os::javaTimeSystemUTC(seconds, nanos);
297
298 // We're going to verify that the result can fit in a long.
299 // For that we need the difference in seconds between 'seconds'
300 // and 'offset_secs' to be such that:
301 // |seconds - offset_secs| < (2^63/10^9)
302 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
303 // which makes |seconds - offset_secs| < 2^33
304 // and we will prefer +/- 2^32 as the maximum acceptable diff
305 // as 2^32 has a more natural feel than 2^33...
306 //
307 // So if |seconds - offset_secs| >= 2^32 - we return a special
308 // sentinel value (-1) which the caller should take as an
309 // exception value indicating that the offset given to us is
310 // too far from range of the current time - leading to too big
311 // a nano adjustment. The caller is expected to recover by
312 // computing a more accurate offset and calling this method
313 // again. (For the record 2^32 secs is ~136 years, so that
314 // should rarely happen)
315 //
316 jlong diff = seconds - offset_secs;
317 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
318 return -1; // sentinel value: the offset is too far off the target
319 }
320
321 // return the adjustment. If you compute a time by adding
322 // this number of nanoseconds along with the number of seconds
323 // in the offset you should get the current UTC time.
324 return (diff * (jlong)1000000000) + nanos;
325 JVM_END
326
327 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
328 jobject dst, jint dst_pos, jint length))
329 JVMWrapper("JVM_ArrayCopy");
330 // Check if we have null pointers
331 if (src == NULL || dst == NULL) {
332 THROW(vmSymbols::java_lang_NullPointerException());
333 }
334 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
335 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
336 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
337 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
338 // Do copy
339 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
340 JVM_END
341
342
343 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
344 JavaValue r(T_OBJECT);
345 // public synchronized Object put(Object key, Object value);
346 HandleMark hm(THREAD);
347 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
348 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
349 JavaCalls::call_virtual(&r,
350 props,
351 SystemDictionary::Properties_klass(),
352 vmSymbols::put_name(),
353 vmSymbols::object_object_object_signature(),
354 key_str,
355 value_str,
356 THREAD);
357 }
358
359
360 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
361
362 /*
363 * Return all of the system properties in a Java String array with alternating
364 * names and values from the jvm SystemProperty.
365 * Which includes some internal and all commandline -D defined properties.
366 */
367 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
368 JVMWrapper("JVM_GetProperties");
369 ResourceMark rm(THREAD);
370 HandleMark hm(THREAD);
371 int ndx = 0;
372 int fixedCount = 2;
373
374 SystemProperty* p = Arguments::system_properties();
375 int count = Arguments::PropertyList_count(p);
376
377 // Allocate result String array
378 InstanceKlass* ik = SystemDictionary::String_klass();
379 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
380 objArrayHandle result_h(THREAD, r);
381
382 while (p != NULL) {
383 const char * key = p->key();
384 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
385 const char * value = p->value();
386 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
387 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
388 result_h->obj_at_put(ndx * 2, key_str());
389 result_h->obj_at_put(ndx * 2 + 1, value_str());
390 ndx++;
391 }
392 p = p->next();
393 }
394
395 // Convert the -XX:MaxDirectMemorySize= command line flag
396 // to the sun.nio.MaxDirectMemorySize property.
397 // Do this after setting user properties to prevent people
398 // from setting the value with a -D option, as requested.
399 // Leave empty if not supplied
400 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
401 char as_chars[256];
402 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
403 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
404 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
405 result_h->obj_at_put(ndx * 2, key_str());
406 result_h->obj_at_put(ndx * 2 + 1, value_str());
407 ndx++;
408 }
409
410 // JVM monitoring and management support
411 // Add the sun.management.compiler property for the compiler's name
412 {
413 #undef CSIZE
414 #if defined(_LP64) || defined(_WIN64)
415 #define CSIZE "64-Bit "
416 #else
417 #define CSIZE
418 #endif // 64bit
419
420 #ifdef TIERED
421 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
422 #else
423 #if defined(COMPILER1)
424 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
425 #elif defined(COMPILER2)
426 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
427 #elif INCLUDE_JVMCI
428 #error "INCLUDE_JVMCI should imply TIERED"
429 #else
430 const char* compiler_name = "";
431 #endif // compilers
432 #endif // TIERED
433
434 if (*compiler_name != '\0' &&
435 (Arguments::mode() != Arguments::_int)) {
436 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
437 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
438 result_h->obj_at_put(ndx * 2, key_str());
439 result_h->obj_at_put(ndx * 2 + 1, value_str());
440 ndx++;
441 }
442 }
443
444 return (jobjectArray) JNIHandles::make_local(env, result_h());
445 JVM_END
446
447
448 /*
449 * Return the temporary directory that the VM uses for the attach
450 * and perf data files.
451 *
452 * It is important that this directory is well-known and the
453 * same for all VM instances. It cannot be affected by configuration
454 * variables such as java.io.tmpdir.
455 */
456 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
457 JVMWrapper("JVM_GetTemporaryDirectory");
458 HandleMark hm(THREAD);
459 const char* temp_dir = os::get_temp_directory();
460 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
461 return (jstring) JNIHandles::make_local(env, h());
462 JVM_END
463
464
465 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
466
467 extern volatile jint vm_created;
468
469 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
470 JVMWrapper("JVM_BeforeHalt");
471 EventShutdown event;
472 if (event.should_commit()) {
473 event.set_reason("Shutdown requested from Java");
474 event.commit();
475 }
476 JVM_END
477
478
479 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
480 before_exit(thread);
481 vm_exit(code);
482 JVM_END
483
484
485 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
486 JVMWrapper("JVM_GC");
487 if (!DisableExplicitGC) {
488 if (AsyncDeflateIdleMonitors) {
489 // AsyncDeflateIdleMonitors needs to know when System.gc() is
490 // called so any special deflation can be done at a safepoint.
491 ObjectSynchronizer::set_is_special_deflation_requested(true);
492 }
493 Universe::heap()->collect(GCCause::_java_lang_system_gc);
494 }
495 JVM_END
496
497
498 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
499 JVMWrapper("JVM_MaxObjectInspectionAge");
500 return Universe::heap()->millis_since_last_gc();
501 JVM_END
502
503
504 static inline jlong convert_size_t_to_jlong(size_t val) {
505 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
506 NOT_LP64 (return (jlong)val;)
507 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
508 }
509
510 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
511 JVMWrapper("JVM_TotalMemory");
512 size_t n = Universe::heap()->capacity();
513 return convert_size_t_to_jlong(n);
514 JVM_END
515
516
517 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
518 JVMWrapper("JVM_FreeMemory");
519 size_t n = Universe::heap()->unused();
520 return convert_size_t_to_jlong(n);
521 JVM_END
522
523
524 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
525 JVMWrapper("JVM_MaxMemory");
526 size_t n = Universe::heap()->max_capacity();
527 return convert_size_t_to_jlong(n);
528 JVM_END
529
530
531 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
532 JVMWrapper("JVM_ActiveProcessorCount");
533 return os::active_processor_count();
534 JVM_END
535
536
537
538 // java.lang.Throwable //////////////////////////////////////////////////////
539
540
541 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
542 JVMWrapper("JVM_FillInStackTrace");
543 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
544 java_lang_Throwable::fill_in_stack_trace(exception);
545 JVM_END
546
547
548 // java.lang.StackTraceElement //////////////////////////////////////////////
549
550
551 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
552 JVMWrapper("JVM_InitStackTraceElementArray");
553 Handle exception(THREAD, JNIHandles::resolve(throwable));
554 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
555 objArrayHandle stack_trace(THREAD, st);
556 // Fill in the allocated stack trace
557 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
558 JVM_END
559
560
561 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
562 JVMWrapper("JVM_InitStackTraceElement");
563 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
564 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
565 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
566 JVM_END
567
568
569 // java.lang.StackWalker //////////////////////////////////////////////////////
570
571
572 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
573 jint skip_frames, jint frame_count, jint start_index,
574 jobjectArray frames))
575 JVMWrapper("JVM_CallStackWalk");
576 JavaThread* jt = (JavaThread*) THREAD;
577 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
578 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
579 }
580
581 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
582
583 // frames array is a Class<?>[] array when only getting caller reference,
584 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
585 // be null.
586 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
587 objArrayHandle frames_array_h(THREAD, fa);
588
589 int limit = start_index + frame_count;
590 if (frames_array_h->length() < limit) {
591 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
592 }
593
594 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
595 start_index, frames_array_h, CHECK_NULL);
596 return JNIHandles::make_local(env, result);
597 JVM_END
598
599
600 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
601 jint frame_count, jint start_index,
602 jobjectArray frames))
603 JVMWrapper("JVM_MoreStackWalk");
604 JavaThread* jt = (JavaThread*) THREAD;
605
606 // frames array is a Class<?>[] array when only getting caller reference,
607 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
608 // be null.
609 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
610 objArrayHandle frames_array_h(THREAD, fa);
611
612 int limit = start_index+frame_count;
613 if (frames_array_h->length() < limit) {
614 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
615 }
616
617 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
618 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
619 start_index, frames_array_h, THREAD);
620 JVM_END
621
622 // java.lang.Object ///////////////////////////////////////////////
623
624
625 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
626 JVMWrapper("JVM_IHashCode");
627 // as implemented in the classic virtual machine; return 0 if object is NULL
628 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
629 JVM_END
630
631
632 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
633 JVMWrapper("JVM_MonitorWait");
634 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
635 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
636 if (JvmtiExport::should_post_monitor_wait()) {
637 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
638
639 // The current thread already owns the monitor and it has not yet
640 // been added to the wait queue so the current thread cannot be
641 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
642 // event handler cannot accidentally consume an unpark() meant for
643 // the ParkEvent associated with this ObjectMonitor.
644 }
645 ObjectSynchronizer::wait(obj, ms, CHECK);
646 JVM_END
647
648
649 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
650 JVMWrapper("JVM_MonitorNotify");
651 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
652 ObjectSynchronizer::notify(obj, CHECK);
653 JVM_END
654
655
656 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
657 JVMWrapper("JVM_MonitorNotifyAll");
658 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
659 ObjectSynchronizer::notifyall(obj, CHECK);
660 JVM_END
661
662
663 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
664 JVMWrapper("JVM_Clone");
665 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
666 Klass* klass = obj->klass();
667 JvmtiVMObjectAllocEventCollector oam;
668
669 #ifdef ASSERT
670 // Just checking that the cloneable flag is set correct
671 if (obj->is_array()) {
672 guarantee(klass->is_cloneable(), "all arrays are cloneable");
673 } else {
674 guarantee(obj->is_instance(), "should be instanceOop");
675 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
676 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
677 }
678 #endif
679
680 // Check if class of obj supports the Cloneable interface.
681 // All arrays are considered to be cloneable (See JLS 20.1.5).
682 // All j.l.r.Reference classes are considered non-cloneable.
683 if (!klass->is_cloneable() ||
684 (klass->is_instance_klass() &&
685 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
686 ResourceMark rm(THREAD);
687 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
688 }
689
690 // Make shallow object copy
691 const int size = obj->size();
692 oop new_obj_oop = NULL;
693 if (obj->is_array()) {
694 const int length = ((arrayOop)obj())->length();
695 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
696 /* do_zero */ true, CHECK_NULL);
697 } else {
698 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
699 }
700
701 HeapAccess<>::clone(obj(), new_obj_oop, size);
702
703 Handle new_obj(THREAD, new_obj_oop);
704 // Caution: this involves a java upcall, so the clone should be
705 // "gc-robust" by this stage.
706 if (klass->has_finalizer()) {
707 assert(obj->is_instance(), "should be instanceOop");
708 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
709 new_obj = Handle(THREAD, new_obj_oop);
710 }
711
712 return JNIHandles::make_local(env, new_obj());
713 JVM_END
714
715 // java.io.File ///////////////////////////////////////////////////////////////
716
717 JVM_LEAF(char*, JVM_NativePath(char* path))
718 JVMWrapper("JVM_NativePath");
719 return os::native_path(path);
720 JVM_END
721
722
723 // Misc. class handling ///////////////////////////////////////////////////////////
724
725
726 JVM_ENTRY(void, JVM_LinkClass(JNIEnv* env, jclass classClass, jclass arg))
727 JVMWrapper("JVM_LinkClass");
728
729 oop r = JNIHandles::resolve(arg);
730 Klass* klass = java_lang_Class::as_Klass(r);
731
732 if (!ClassForNameDeferLinking && klass->is_instance_klass()) {
733 InstanceKlass::cast(klass)->link_class(CHECK);
734 }
735 JVM_END
736
737 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
738 JVMWrapper("JVM_GetCallerClass");
739
740 // Getting the class of the caller frame.
741 //
742 // The call stack at this point looks something like this:
743 //
744 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
745 // [1] [ @CallerSensitive API.method ]
746 // [.] [ (skipped intermediate frames) ]
747 // [n] [ caller ]
748 vframeStream vfst(thread);
749 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
750 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
751 Method* m = vfst.method();
752 assert(m != NULL, "sanity");
753 switch (n) {
754 case 0:
755 // This must only be called from Reflection.getCallerClass
756 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
757 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
758 }
759 // fall-through
760 case 1:
761 // Frame 0 and 1 must be caller sensitive.
762 if (!m->caller_sensitive()) {
763 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
764 }
765 break;
766 default:
767 if (!m->is_ignored_by_security_stack_walk()) {
768 // We have reached the desired frame; return the holder class.
769 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
770 }
771 break;
772 }
773 }
774 return NULL;
775 JVM_END
776
777
778 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
779 JVMWrapper("JVM_FindPrimitiveClass");
780 oop mirror = NULL;
781 BasicType t = name2type(utf);
782 if (t != T_ILLEGAL && !is_reference_type(t)) {
783 mirror = Universe::java_mirror(t);
784 }
785 if (mirror == NULL) {
786 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
787 } else {
788 return (jclass) JNIHandles::make_local(env, mirror);
789 }
790 JVM_END
791
792
793 // Returns a class loaded by the bootstrap class loader; or null
794 // if not found. ClassNotFoundException is not thrown.
795 // FindClassFromBootLoader is exported to the launcher for windows.
796 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
797 const char* name))
798 JVMWrapper("JVM_FindClassFromBootLoader");
799
800 // Java libraries should ensure that name is never null...
801 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
802 // It's impossible to create this class; the name cannot fit
803 // into the constant pool.
804 return NULL;
805 }
806
807 TempNewSymbol h_name = SymbolTable::new_symbol(name);
808 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
809 if (k == NULL) {
810 return NULL;
811 }
812
813 if (log_is_enabled(Debug, class, resolve)) {
814 trace_class_resolution(k);
815 }
816 return (jclass) JNIHandles::make_local(env, k->java_mirror());
817 JVM_END
818
819 // Find a class with this name in this loader, using the caller's protection domain.
820 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
821 jboolean init, jobject loader,
822 jclass caller))
823 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
824 // Java libraries should ensure that name is never null...
825 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
826 // It's impossible to create this class; the name cannot fit
827 // into the constant pool.
828 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
829 }
830
831 TempNewSymbol h_name = SymbolTable::new_symbol(name);
832
833 oop loader_oop = JNIHandles::resolve(loader);
834 oop from_class = JNIHandles::resolve(caller);
835 oop protection_domain = NULL;
836 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
837 // NPE. Put it in another way, the bootstrap class loader has all permission and
838 // thus no checkPackageAccess equivalence in the VM class loader.
839 // The caller is also passed as NULL by the java code if there is no security
840 // manager to avoid the performance cost of getting the calling class.
841 if (from_class != NULL && loader_oop != NULL) {
842 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
843 }
844
845 Handle h_loader(THREAD, loader_oop);
846 Handle h_prot(THREAD, protection_domain);
847
848 jboolean link = !ClassForNameDeferLinking;
849 jclass result = find_class_from_class_loader(env, h_name, init, link, h_loader,
850 h_prot, false, THREAD);
851 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
852 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
853 }
854 return result;
855 JVM_END
856
857 // Currently only called from the old verifier.
858 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
859 jboolean init, jclass from))
860 JVMWrapper("JVM_FindClassFromClass");
861 if (name == NULL) {
862 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
863 }
864 if ((int)strlen(name) > Symbol::max_length()) {
865 // It's impossible to create this class; the name cannot fit
866 // into the constant pool.
867 Exceptions::fthrow(THREAD_AND_LOCATION,
868 vmSymbols::java_lang_NoClassDefFoundError(),
869 "Class name exceeds maximum length of %d: %s",
870 Symbol::max_length(),
871 name);
872 return 0;
873 }
874 TempNewSymbol h_name = SymbolTable::new_symbol(name);
875 oop from_class_oop = JNIHandles::resolve(from);
876 Klass* from_class = (from_class_oop == NULL)
877 ? (Klass*)NULL
878 : java_lang_Class::as_Klass(from_class_oop);
879 oop class_loader = NULL;
880 oop protection_domain = NULL;
881 if (from_class != NULL) {
882 class_loader = from_class->class_loader();
883 protection_domain = from_class->protection_domain();
884 }
885 Handle h_loader(THREAD, class_loader);
886 Handle h_prot (THREAD, protection_domain);
887 jclass result = find_class_from_class_loader(env, h_name, init, false, h_loader,
888 h_prot, true, thread);
889
890 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
891 // this function is generally only used for class loading during verification.
892 ResourceMark rm;
893 oop from_mirror = JNIHandles::resolve_non_null(from);
894 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
895 const char * from_name = from_class->external_name();
896
897 oop mirror = JNIHandles::resolve_non_null(result);
898 Klass* to_class = java_lang_Class::as_Klass(mirror);
899 const char * to = to_class->external_name();
900 log_debug(class, resolve)("%s %s (verification)", from_name, to);
901 }
902
903 return result;
904 JVM_END
905
906 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
907 if (loader.is_null()) {
908 return;
909 }
910
911 // check whether the current caller thread holds the lock or not.
912 // If not, increment the corresponding counter
913 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
914 ObjectSynchronizer::owner_self) {
915 counter->inc();
916 }
917 }
918
919 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
920 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
921 jobject loader, const jbyte *buf,
922 jsize len, jobject pd, const char *source,
923 TRAPS) {
924 if (source == NULL) source = "__JVM_DefineClass__";
925
926 assert(THREAD->is_Java_thread(), "must be a JavaThread");
927 JavaThread* jt = (JavaThread*) THREAD;
928
929 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
930 ClassLoader::perf_define_appclass_selftime(),
931 ClassLoader::perf_define_appclasses(),
932 jt->get_thread_stat()->perf_recursion_counts_addr(),
933 jt->get_thread_stat()->perf_timers_addr(),
934 PerfClassTraceTime::DEFINE_CLASS);
935
936 if (UsePerfData) {
937 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
938 }
939
940 // Since exceptions can be thrown, class initialization can take place
941 // if name is NULL no check for class name in .class stream has to be made.
942 TempNewSymbol class_name = NULL;
943 if (name != NULL) {
944 const int str_len = (int)strlen(name);
945 if (str_len > Symbol::max_length()) {
946 // It's impossible to create this class; the name cannot fit
947 // into the constant pool.
948 Exceptions::fthrow(THREAD_AND_LOCATION,
949 vmSymbols::java_lang_NoClassDefFoundError(),
950 "Class name exceeds maximum length of %d: %s",
951 Symbol::max_length(),
952 name);
953 return 0;
954 }
955 class_name = SymbolTable::new_symbol(name, str_len);
956 }
957
958 ResourceMark rm(THREAD);
959 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
960 Handle class_loader (THREAD, JNIHandles::resolve(loader));
961 if (UsePerfData) {
962 is_lock_held_by_thread(class_loader,
963 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
964 THREAD);
965 }
966 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
967 Klass* k = SystemDictionary::resolve_from_stream(class_name,
968 class_loader,
969 protection_domain,
970 &st,
971 CHECK_NULL);
972
973 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
974 trace_class_resolution(k);
975 }
976
977 return (jclass) JNIHandles::make_local(env, k->java_mirror());
978 }
979
980
981 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
982 JVMWrapper("JVM_DefineClass");
983
984 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
985 JVM_END
986
987
988 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
989 JVMWrapper("JVM_DefineClassWithSource");
990
991 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
992 JVM_END
993
994 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
995 JVMWrapper("JVM_FindLoadedClass");
996 ResourceMark rm(THREAD);
997
998 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
999 char* str = java_lang_String::as_utf8_string(h_name());
1000
1001 // Sanity check, don't expect null
1002 if (str == NULL) return NULL;
1003
1004 // Internalize the string, converting '.' to '/' in string.
1005 char* p = (char*)str;
1006 while (*p != '\0') {
1007 if (*p == '.') {
1008 *p = '/';
1009 }
1010 p++;
1011 }
1012
1013 const int str_len = (int)(p - str);
1014 if (str_len > Symbol::max_length()) {
1015 // It's impossible to create this class; the name cannot fit
1016 // into the constant pool.
1017 return NULL;
1018 }
1019 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1020
1021 // Security Note:
1022 // The Java level wrapper will perform the necessary security check allowing
1023 // us to pass the NULL as the initiating class loader.
1024 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1025 if (UsePerfData) {
1026 is_lock_held_by_thread(h_loader,
1027 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1028 THREAD);
1029 }
1030
1031 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1032 h_loader,
1033 Handle(),
1034 CHECK_NULL);
1035 #if INCLUDE_CDS
1036 if (k == NULL) {
1037 // If the class is not already loaded, try to see if it's in the shared
1038 // archive for the current classloader (h_loader).
1039 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1040 }
1041 #endif
1042 return (k == NULL) ? NULL :
1043 (jclass) JNIHandles::make_local(env, k->java_mirror());
1044 JVM_END
1045
1046 // Module support //////////////////////////////////////////////////////////////////////////////
1047
1048 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1049 jstring location, const char* const* packages, jsize num_packages))
1050 JVMWrapper("JVM_DefineModule");
1051 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1052 JVM_END
1053
1054 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1055 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1056 Modules::set_bootloader_unnamed_module(module, CHECK);
1057 JVM_END
1058
1059 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1060 JVMWrapper("JVM_AddModuleExports");
1061 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1062 JVM_END
1063
1064 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1065 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1066 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1067 JVM_END
1068
1069 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1070 JVMWrapper("JVM_AddModuleExportsToAll");
1071 Modules::add_module_exports(from_module, package, NULL, CHECK);
1072 JVM_END
1073
1074 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1075 JVMWrapper("JVM_AddReadsModule");
1076 Modules::add_reads_module(from_module, source_module, CHECK);
1077 JVM_END
1078
1079 // Reflection support //////////////////////////////////////////////////////////////////////////////
1080
1081 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1082 assert (cls != NULL, "illegal class");
1083 JVMWrapper("JVM_InitClassName");
1084 JvmtiVMObjectAllocEventCollector oam;
1085 ResourceMark rm(THREAD);
1086 HandleMark hm(THREAD);
1087 Handle java_class(THREAD, JNIHandles::resolve(cls));
1088 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1089 return (jstring) JNIHandles::make_local(env, result);
1090 JVM_END
1091
1092
1093 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1094 JVMWrapper("JVM_GetClassInterfaces");
1095 JvmtiVMObjectAllocEventCollector oam;
1096 oop mirror = JNIHandles::resolve_non_null(cls);
1097
1098 // Special handling for primitive objects
1099 if (java_lang_Class::is_primitive(mirror)) {
1100 // Primitive objects does not have any interfaces
1101 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1102 return (jobjectArray) JNIHandles::make_local(env, r);
1103 }
1104
1105 Klass* klass = java_lang_Class::as_Klass(mirror);
1106 // Figure size of result array
1107 int size;
1108 if (klass->is_instance_klass()) {
1109 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1110 } else {
1111 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1112 size = 2;
1113 }
1114
1115 // Allocate result array
1116 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1117 objArrayHandle result (THREAD, r);
1118 // Fill in result
1119 if (klass->is_instance_klass()) {
1120 // Regular instance klass, fill in all local interfaces
1121 for (int index = 0; index < size; index++) {
1122 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1123 result->obj_at_put(index, k->java_mirror());
1124 }
1125 } else {
1126 // All arrays implement java.lang.Cloneable and java.io.Serializable
1127 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1128 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1129 }
1130 return (jobjectArray) JNIHandles::make_local(env, result());
1131 JVM_END
1132
1133
1134 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1135 JVMWrapper("JVM_IsInterface");
1136 oop mirror = JNIHandles::resolve_non_null(cls);
1137 if (java_lang_Class::is_primitive(mirror)) {
1138 return JNI_FALSE;
1139 }
1140 Klass* k = java_lang_Class::as_Klass(mirror);
1141 jboolean result = k->is_interface();
1142 assert(!result || k->is_instance_klass(),
1143 "all interfaces are instance types");
1144 // The compiler intrinsic for isInterface tests the
1145 // Klass::_access_flags bits in the same way.
1146 return result;
1147 JVM_END
1148
1149
1150 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1151 JVMWrapper("JVM_GetClassSigners");
1152 JvmtiVMObjectAllocEventCollector oam;
1153 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1154 // There are no signers for primitive types
1155 return NULL;
1156 }
1157
1158 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1159
1160 // If there are no signers set in the class, or if the class
1161 // is an array, return NULL.
1162 if (signers == NULL) return NULL;
1163
1164 // copy of the signers array
1165 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1166 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1167 for (int index = 0; index < signers->length(); index++) {
1168 signers_copy->obj_at_put(index, signers->obj_at(index));
1169 }
1170
1171 // return the copy
1172 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1173 JVM_END
1174
1175
1176 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1177 JVMWrapper("JVM_SetClassSigners");
1178 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1179 // This call is ignored for primitive types and arrays.
1180 // Signers are only set once, ClassLoader.java, and thus shouldn't
1181 // be called with an array. Only the bootstrap loader creates arrays.
1182 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1183 if (k->is_instance_klass()) {
1184 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1185 }
1186 }
1187 JVM_END
1188
1189
1190 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1191 JVMWrapper("JVM_GetProtectionDomain");
1192 if (JNIHandles::resolve(cls) == NULL) {
1193 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1194 }
1195
1196 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1197 // Primitive types does not have a protection domain.
1198 return NULL;
1199 }
1200
1201 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1202 return (jobject) JNIHandles::make_local(env, pd);
1203 JVM_END
1204
1205
1206 // Returns the inherited_access_control_context field of the running thread.
1207 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1208 JVMWrapper("JVM_GetInheritedAccessControlContext");
1209 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1210 return JNIHandles::make_local(env, result);
1211 JVM_END
1212
1213 class RegisterArrayForGC {
1214 private:
1215 JavaThread *_thread;
1216 public:
1217 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1218 _thread = thread;
1219 _thread->register_array_for_gc(array);
1220 }
1221
1222 ~RegisterArrayForGC() {
1223 _thread->register_array_for_gc(NULL);
1224 }
1225 };
1226
1227
1228 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1229 JVMWrapper("JVM_GetStackAccessControlContext");
1230 if (!UsePrivilegedStack) return NULL;
1231
1232 ResourceMark rm(THREAD);
1233 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1234 JvmtiVMObjectAllocEventCollector oam;
1235
1236 // count the protection domains on the execution stack. We collapse
1237 // duplicate consecutive protection domains into a single one, as
1238 // well as stopping when we hit a privileged frame.
1239
1240 oop previous_protection_domain = NULL;
1241 Handle privileged_context(thread, NULL);
1242 bool is_privileged = false;
1243 oop protection_domain = NULL;
1244
1245 // Iterate through Java frames
1246 vframeStream vfst(thread);
1247 for(; !vfst.at_end(); vfst.next()) {
1248 // get method of frame
1249 Method* method = vfst.method();
1250
1251 // stop at the first privileged frame
1252 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1253 method->name() == vmSymbols::executePrivileged_name())
1254 {
1255 // this frame is privileged
1256 is_privileged = true;
1257
1258 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1259
1260 StackValueCollection* locals = priv->locals();
1261 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1262 StackValue* clr_sv = locals->at(2); // Class<?> caller
1263 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1264 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1265 privileged_context = ctx_sv->get_obj();
1266 Handle caller = clr_sv->get_obj();
1267
1268 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1269 protection_domain = caller_klass->protection_domain();
1270 } else {
1271 protection_domain = method->method_holder()->protection_domain();
1272 }
1273
1274 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1275 local_array->push(protection_domain);
1276 previous_protection_domain = protection_domain;
1277 }
1278
1279 if (is_privileged) break;
1280 }
1281
1282
1283 // either all the domains on the stack were system domains, or
1284 // we had a privileged system domain
1285 if (local_array->is_empty()) {
1286 if (is_privileged && privileged_context.is_null()) return NULL;
1287
1288 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1289 return JNIHandles::make_local(env, result);
1290 }
1291
1292 // the resource area must be registered in case of a gc
1293 RegisterArrayForGC ragc(thread, local_array);
1294 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1295 local_array->length(), CHECK_NULL);
1296 objArrayHandle h_context(thread, context);
1297 for (int index = 0; index < local_array->length(); index++) {
1298 h_context->obj_at_put(index, local_array->at(index));
1299 }
1300
1301 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1302
1303 return JNIHandles::make_local(env, result);
1304 JVM_END
1305
1306
1307 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1308 JVMWrapper("JVM_IsArrayClass");
1309 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1310 return (k != NULL) && k->is_array_klass() ? true : false;
1311 JVM_END
1312
1313
1314 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1315 JVMWrapper("JVM_IsPrimitiveClass");
1316 oop mirror = JNIHandles::resolve_non_null(cls);
1317 return (jboolean) java_lang_Class::is_primitive(mirror);
1318 JVM_END
1319
1320
1321 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1322 JVMWrapper("JVM_GetClassModifiers");
1323 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1324 // Primitive type
1325 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1326 }
1327
1328 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1329 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1330 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1331 return k->modifier_flags();
1332 JVM_END
1333
1334
1335 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1336
1337 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1338 JvmtiVMObjectAllocEventCollector oam;
1339 // ofClass is a reference to a java_lang_Class object. The mirror object
1340 // of an InstanceKlass
1341
1342 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1343 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1344 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1345 return (jobjectArray)JNIHandles::make_local(env, result);
1346 }
1347
1348 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1349 InnerClassesIterator iter(k);
1350
1351 if (iter.length() == 0) {
1352 // Neither an inner nor outer class
1353 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1354 return (jobjectArray)JNIHandles::make_local(env, result);
1355 }
1356
1357 // find inner class info
1358 constantPoolHandle cp(thread, k->constants());
1359 int length = iter.length();
1360
1361 // Allocate temp. result array
1362 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1363 objArrayHandle result (THREAD, r);
1364 int members = 0;
1365
1366 for (; !iter.done(); iter.next()) {
1367 int ioff = iter.inner_class_info_index();
1368 int ooff = iter.outer_class_info_index();
1369
1370 if (ioff != 0 && ooff != 0) {
1371 // Check to see if the name matches the class we're looking for
1372 // before attempting to find the class.
1373 if (cp->klass_name_at_matches(k, ooff)) {
1374 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1375 if (outer_klass == k) {
1376 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1377 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1378
1379 // Throws an exception if outer klass has not declared k as
1380 // an inner klass
1381 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1382
1383 result->obj_at_put(members, inner_klass->java_mirror());
1384 members++;
1385 }
1386 }
1387 }
1388 }
1389
1390 if (members != length) {
1391 // Return array of right length
1392 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1393 for(int i = 0; i < members; i++) {
1394 res->obj_at_put(i, result->obj_at(i));
1395 }
1396 return (jobjectArray)JNIHandles::make_local(env, res);
1397 }
1398
1399 return (jobjectArray)JNIHandles::make_local(env, result());
1400 JVM_END
1401
1402
1403 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1404 {
1405 // ofClass is a reference to a java_lang_Class object.
1406 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1407 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1408 return NULL;
1409 }
1410
1411 bool inner_is_member = false;
1412 Klass* outer_klass
1413 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1414 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1415 if (outer_klass == NULL) return NULL; // already a top-level class
1416 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1417 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1418 }
1419 JVM_END
1420
1421 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1422 {
1423 oop mirror = JNIHandles::resolve_non_null(cls);
1424 if (java_lang_Class::is_primitive(mirror) ||
1425 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1426 return NULL;
1427 }
1428 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1429 int ooff = 0, noff = 0;
1430 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1431 if (noff != 0) {
1432 constantPoolHandle i_cp(thread, k->constants());
1433 Symbol* name = i_cp->symbol_at(noff);
1434 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1435 return (jstring) JNIHandles::make_local(env, str());
1436 }
1437 }
1438 return NULL;
1439 }
1440 JVM_END
1441
1442 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1443 assert (cls != NULL, "illegal class");
1444 JVMWrapper("JVM_GetClassSignature");
1445 JvmtiVMObjectAllocEventCollector oam;
1446 ResourceMark rm(THREAD);
1447 // Return null for arrays and primatives
1448 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1449 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1450 if (k->is_instance_klass()) {
1451 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1452 if (sym == NULL) return NULL;
1453 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1454 return (jstring) JNIHandles::make_local(env, str());
1455 }
1456 }
1457 return NULL;
1458 JVM_END
1459
1460
1461 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1462 assert (cls != NULL, "illegal class");
1463 JVMWrapper("JVM_GetClassAnnotations");
1464
1465 // Return null for arrays and primitives
1466 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1467 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1468 if (k->is_instance_klass()) {
1469 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1470 return (jbyteArray) JNIHandles::make_local(env, a);
1471 }
1472 }
1473 return NULL;
1474 JVM_END
1475
1476
1477 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1478 // some of this code was adapted from from jni_FromReflectedField
1479
1480 oop reflected = JNIHandles::resolve_non_null(field);
1481 oop mirror = java_lang_reflect_Field::clazz(reflected);
1482 Klass* k = java_lang_Class::as_Klass(mirror);
1483 int slot = java_lang_reflect_Field::slot(reflected);
1484 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1485
1486 InstanceKlass* ik = InstanceKlass::cast(k);
1487 intptr_t offset = ik->field_offset(slot);
1488
1489 if (modifiers & JVM_ACC_STATIC) {
1490 // for static fields we only look in the current class
1491 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1492 assert(false, "cannot find static field");
1493 return false;
1494 }
1495 } else {
1496 // for instance fields we start with the current class and work
1497 // our way up through the superclass chain
1498 if (!ik->find_field_from_offset(offset, false, &fd)) {
1499 assert(false, "cannot find instance field");
1500 return false;
1501 }
1502 }
1503 return true;
1504 }
1505
1506 static Method* jvm_get_method_common(jobject method) {
1507 // some of this code was adapted from from jni_FromReflectedMethod
1508
1509 oop reflected = JNIHandles::resolve_non_null(method);
1510 oop mirror = NULL;
1511 int slot = 0;
1512
1513 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1514 mirror = java_lang_reflect_Constructor::clazz(reflected);
1515 slot = java_lang_reflect_Constructor::slot(reflected);
1516 } else {
1517 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1518 "wrong type");
1519 mirror = java_lang_reflect_Method::clazz(reflected);
1520 slot = java_lang_reflect_Method::slot(reflected);
1521 }
1522 Klass* k = java_lang_Class::as_Klass(mirror);
1523
1524 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1525 assert(m != NULL, "cannot find method");
1526 return m; // caller has to deal with NULL in product mode
1527 }
1528
1529 /* Type use annotations support (JDK 1.8) */
1530
1531 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1532 assert (cls != NULL, "illegal class");
1533 JVMWrapper("JVM_GetClassTypeAnnotations");
1534 ResourceMark rm(THREAD);
1535 // Return null for arrays and primitives
1536 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1537 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1538 if (k->is_instance_klass()) {
1539 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1540 if (type_annotations != NULL) {
1541 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1542 return (jbyteArray) JNIHandles::make_local(env, a);
1543 }
1544 }
1545 }
1546 return NULL;
1547 JVM_END
1548
1549 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1550 assert (method != NULL, "illegal method");
1551 JVMWrapper("JVM_GetMethodTypeAnnotations");
1552
1553 // method is a handle to a java.lang.reflect.Method object
1554 Method* m = jvm_get_method_common(method);
1555 if (m == NULL) {
1556 return NULL;
1557 }
1558
1559 AnnotationArray* type_annotations = m->type_annotations();
1560 if (type_annotations != NULL) {
1561 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1562 return (jbyteArray) JNIHandles::make_local(env, a);
1563 }
1564
1565 return NULL;
1566 JVM_END
1567
1568 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1569 assert (field != NULL, "illegal field");
1570 JVMWrapper("JVM_GetFieldTypeAnnotations");
1571
1572 fieldDescriptor fd;
1573 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1574 if (!gotFd) {
1575 return NULL;
1576 }
1577
1578 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1579 JVM_END
1580
1581 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1582 if (!cp->is_within_bounds(index)) {
1583 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1584 }
1585 }
1586
1587 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1588 {
1589 JVMWrapper("JVM_GetMethodParameters");
1590 // method is a handle to a java.lang.reflect.Method object
1591 Method* method_ptr = jvm_get_method_common(method);
1592 methodHandle mh (THREAD, method_ptr);
1593 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1594 const int num_params = mh->method_parameters_length();
1595
1596 if (num_params < 0) {
1597 // A -1 return value from method_parameters_length means there is no
1598 // parameter data. Return null to indicate this to the reflection
1599 // API.
1600 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1601 return (jobjectArray)NULL;
1602 } else {
1603 // Otherwise, we return something up to reflection, even if it is
1604 // a zero-length array. Why? Because in some cases this can
1605 // trigger a MalformedParametersException.
1606
1607 // make sure all the symbols are properly formatted
1608 for (int i = 0; i < num_params; i++) {
1609 MethodParametersElement* params = mh->method_parameters_start();
1610 int index = params[i].name_cp_index;
1611 bounds_check(mh->constants(), index, CHECK_NULL);
1612
1613 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1614 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1615 "Wrong type at constant pool index");
1616 }
1617
1618 }
1619
1620 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1621 objArrayHandle result (THREAD, result_oop);
1622
1623 for (int i = 0; i < num_params; i++) {
1624 MethodParametersElement* params = mh->method_parameters_start();
1625 // For a 0 index, give a NULL symbol
1626 Symbol* sym = 0 != params[i].name_cp_index ?
1627 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1628 int flags = params[i].flags;
1629 oop param = Reflection::new_parameter(reflected_method, i, sym,
1630 flags, CHECK_NULL);
1631 result->obj_at_put(i, param);
1632 }
1633 return (jobjectArray)JNIHandles::make_local(env, result());
1634 }
1635 }
1636 JVM_END
1637
1638 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1639
1640 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1641 {
1642 JVMWrapper("JVM_GetClassDeclaredFields");
1643 JvmtiVMObjectAllocEventCollector oam;
1644
1645 // Exclude primitive types and array types
1646 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1647 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1648 // Return empty array
1649 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1650 return (jobjectArray) JNIHandles::make_local(env, res);
1651 }
1652
1653 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1654 constantPoolHandle cp(THREAD, k->constants());
1655
1656 // Ensure class is linked
1657 k->link_class(CHECK_NULL);
1658
1659 // Allocate result
1660 int num_fields;
1661
1662 if (publicOnly) {
1663 num_fields = 0;
1664 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1665 if (fs.access_flags().is_public()) ++num_fields;
1666 }
1667 } else {
1668 num_fields = k->java_fields_count();
1669 }
1670
1671 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1672 objArrayHandle result (THREAD, r);
1673
1674 int out_idx = 0;
1675 fieldDescriptor fd;
1676 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1677 if (!publicOnly || fs.access_flags().is_public()) {
1678 fd.reinitialize(k, fs.index());
1679 oop field = Reflection::new_field(&fd, CHECK_NULL);
1680 result->obj_at_put(out_idx, field);
1681 ++out_idx;
1682 }
1683 }
1684 assert(out_idx == num_fields, "just checking");
1685 return (jobjectArray) JNIHandles::make_local(env, result());
1686 }
1687 JVM_END
1688
1689 static bool select_method(const methodHandle& method, bool want_constructor) {
1690 if (want_constructor) {
1691 return (method->is_initializer() && !method->is_static());
1692 } else {
1693 return (!method->is_initializer() && !method->is_overpass());
1694 }
1695 }
1696
1697 static jobjectArray get_class_declared_methods_helper(
1698 JNIEnv *env,
1699 jclass ofClass, jboolean publicOnly,
1700 bool want_constructor,
1701 Klass* klass, TRAPS) {
1702
1703 JvmtiVMObjectAllocEventCollector oam;
1704
1705 // Exclude primitive types and array types
1706 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1707 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1708 // Return empty array
1709 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1710 return (jobjectArray) JNIHandles::make_local(env, res);
1711 }
1712
1713 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1714
1715 // Ensure class is linked
1716 k->link_class(CHECK_NULL);
1717
1718 Array<Method*>* methods = k->methods();
1719 int methods_length = methods->length();
1720
1721 // Save original method_idnum in case of redefinition, which can change
1722 // the idnum of obsolete methods. The new method will have the same idnum
1723 // but if we refresh the methods array, the counts will be wrong.
1724 ResourceMark rm(THREAD);
1725 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1726 int num_methods = 0;
1727
1728 for (int i = 0; i < methods_length; i++) {
1729 methodHandle method(THREAD, methods->at(i));
1730 if (select_method(method, want_constructor)) {
1731 if (!publicOnly || method->is_public()) {
1732 idnums->push(method->method_idnum());
1733 ++num_methods;
1734 }
1735 }
1736 }
1737
1738 // Allocate result
1739 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1740 objArrayHandle result (THREAD, r);
1741
1742 // Now just put the methods that we selected above, but go by their idnum
1743 // in case of redefinition. The methods can be redefined at any safepoint,
1744 // so above when allocating the oop array and below when creating reflect
1745 // objects.
1746 for (int i = 0; i < num_methods; i++) {
1747 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1748 if (method.is_null()) {
1749 // Method may have been deleted and seems this API can handle null
1750 // Otherwise should probably put a method that throws NSME
1751 result->obj_at_put(i, NULL);
1752 } else {
1753 oop m;
1754 if (want_constructor) {
1755 m = Reflection::new_constructor(method, CHECK_NULL);
1756 } else {
1757 m = Reflection::new_method(method, false, CHECK_NULL);
1758 }
1759 result->obj_at_put(i, m);
1760 }
1761 }
1762
1763 return (jobjectArray) JNIHandles::make_local(env, result());
1764 }
1765
1766 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1767 {
1768 JVMWrapper("JVM_GetClassDeclaredMethods");
1769 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1770 /*want_constructor*/ false,
1771 SystemDictionary::reflect_Method_klass(), THREAD);
1772 }
1773 JVM_END
1774
1775 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1776 {
1777 JVMWrapper("JVM_GetClassDeclaredConstructors");
1778 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1779 /*want_constructor*/ true,
1780 SystemDictionary::reflect_Constructor_klass(), THREAD);
1781 }
1782 JVM_END
1783
1784 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1785 {
1786 JVMWrapper("JVM_GetClassAccessFlags");
1787 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1788 // Primitive type
1789 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1790 }
1791
1792 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1793 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1794 }
1795 JVM_END
1796
1797 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1798 {
1799 JVMWrapper("JVM_AreNestMates");
1800 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1801 assert(c->is_instance_klass(), "must be");
1802 InstanceKlass* ck = InstanceKlass::cast(c);
1803 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1804 assert(m->is_instance_klass(), "must be");
1805 InstanceKlass* mk = InstanceKlass::cast(m);
1806 return ck->has_nestmate_access_to(mk, THREAD);
1807 }
1808 JVM_END
1809
1810 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1811 {
1812 // current is not a primitive or array class
1813 JVMWrapper("JVM_GetNestHost");
1814 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1815 assert(c->is_instance_klass(), "must be");
1816 InstanceKlass* ck = InstanceKlass::cast(c);
1817 // Don't post exceptions if validation fails
1818 InstanceKlass* host = ck->nest_host(NULL, THREAD);
1819 return (jclass) (host == NULL ? NULL :
1820 JNIHandles::make_local(THREAD, host->java_mirror()));
1821 }
1822 JVM_END
1823
1824 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1825 {
1826 // current is not a primitive or array class
1827 JVMWrapper("JVM_GetNestMembers");
1828 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1829 assert(c->is_instance_klass(), "must be");
1830 InstanceKlass* ck = InstanceKlass::cast(c);
1831 // Get the nest host for this nest - throw ICCE if validation fails
1832 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
1833 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
1834
1835 {
1836 JvmtiVMObjectAllocEventCollector oam;
1837 Array<u2>* members = host->nest_members();
1838 int length = members == NULL ? 0 : members->length();
1839 // nest host is first in the array so make it one bigger
1840 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
1841 length + 1, CHECK_NULL);
1842 objArrayHandle result (THREAD, r);
1843 result->obj_at_put(0, host->java_mirror());
1844 if (length != 0) {
1845 int i;
1846 for (i = 0; i < length; i++) {
1847 int cp_index = members->at(i);
1848 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
1849 if (k->is_instance_klass()) {
1850 InstanceKlass* nest_host_k =
1851 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
1852 if (nest_host_k == host) {
1853 result->obj_at_put(i+1, k->java_mirror());
1854 }
1855 else {
1856 // k's nest host is legal but it isn't our host so
1857 // throw ICCE
1858 ResourceMark rm(THREAD);
1859 Exceptions::fthrow(THREAD_AND_LOCATION,
1860 icce,
1861 "Nest member %s in %s declares a different nest host of %s",
1862 k->external_name(),
1863 host->external_name(),
1864 nest_host_k->external_name()
1865 );
1866 return NULL;
1867 }
1868 }
1869 else {
1870 // we have a bad nest member entry - throw ICCE
1871 ResourceMark rm(THREAD);
1872 Exceptions::fthrow(THREAD_AND_LOCATION,
1873 icce,
1874 "Class %s can not be a nest member of %s",
1875 k->external_name(),
1876 host->external_name()
1877 );
1878 return NULL;
1879 }
1880 }
1881 }
1882 else {
1883 assert(host == ck, "must be singleton nest");
1884 }
1885 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1886 }
1887 }
1888 JVM_END
1889
1890 // Constant pool access //////////////////////////////////////////////////////////
1891
1892 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1893 {
1894 JVMWrapper("JVM_GetClassConstantPool");
1895 JvmtiVMObjectAllocEventCollector oam;
1896
1897 // Return null for primitives and arrays
1898 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1899 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1900 if (k->is_instance_klass()) {
1901 InstanceKlass* k_h = InstanceKlass::cast(k);
1902 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1903 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1904 return JNIHandles::make_local(jcp());
1905 }
1906 }
1907 return NULL;
1908 }
1909 JVM_END
1910
1911
1912 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1913 {
1914 JVMWrapper("JVM_ConstantPoolGetSize");
1915 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1916 return cp->length();
1917 }
1918 JVM_END
1919
1920
1921 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1922 {
1923 JVMWrapper("JVM_ConstantPoolGetClassAt");
1924 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1925 bounds_check(cp, index, CHECK_NULL);
1926 constantTag tag = cp->tag_at(index);
1927 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1928 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1929 }
1930 Klass* k = cp->klass_at(index, CHECK_NULL);
1931 return (jclass) JNIHandles::make_local(k->java_mirror());
1932 }
1933 JVM_END
1934
1935 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1936 {
1937 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1938 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1939 bounds_check(cp, index, CHECK_NULL);
1940 constantTag tag = cp->tag_at(index);
1941 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1942 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1943 }
1944 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1945 if (k == NULL) return NULL;
1946 return (jclass) JNIHandles::make_local(k->java_mirror());
1947 }
1948 JVM_END
1949
1950 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1951 constantTag tag = cp->tag_at(index);
1952 if (!tag.is_method() && !tag.is_interface_method()) {
1953 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1954 }
1955 int klass_ref = cp->uncached_klass_ref_index_at(index);
1956 Klass* k_o;
1957 if (force_resolution) {
1958 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1959 } else {
1960 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1961 if (k_o == NULL) return NULL;
1962 }
1963 InstanceKlass* k = InstanceKlass::cast(k_o);
1964 Symbol* name = cp->uncached_name_ref_at(index);
1965 Symbol* sig = cp->uncached_signature_ref_at(index);
1966 methodHandle m (THREAD, k->find_method(name, sig));
1967 if (m.is_null()) {
1968 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1969 }
1970 oop method;
1971 if (!m->is_initializer() || m->is_static()) {
1972 method = Reflection::new_method(m, true, CHECK_NULL);
1973 } else {
1974 method = Reflection::new_constructor(m, CHECK_NULL);
1975 }
1976 return JNIHandles::make_local(method);
1977 }
1978
1979 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1980 {
1981 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1982 JvmtiVMObjectAllocEventCollector oam;
1983 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1984 bounds_check(cp, index, CHECK_NULL);
1985 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1986 return res;
1987 }
1988 JVM_END
1989
1990 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1991 {
1992 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1993 JvmtiVMObjectAllocEventCollector oam;
1994 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1995 bounds_check(cp, index, CHECK_NULL);
1996 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1997 return res;
1998 }
1999 JVM_END
2000
2001 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2002 constantTag tag = cp->tag_at(index);
2003 if (!tag.is_field()) {
2004 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2005 }
2006 int klass_ref = cp->uncached_klass_ref_index_at(index);
2007 Klass* k_o;
2008 if (force_resolution) {
2009 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2010 } else {
2011 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2012 if (k_o == NULL) return NULL;
2013 }
2014 InstanceKlass* k = InstanceKlass::cast(k_o);
2015 Symbol* name = cp->uncached_name_ref_at(index);
2016 Symbol* sig = cp->uncached_signature_ref_at(index);
2017 fieldDescriptor fd;
2018 Klass* target_klass = k->find_field(name, sig, &fd);
2019 if (target_klass == NULL) {
2020 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2021 }
2022 oop field = Reflection::new_field(&fd, CHECK_NULL);
2023 return JNIHandles::make_local(field);
2024 }
2025
2026 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2027 {
2028 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2029 JvmtiVMObjectAllocEventCollector oam;
2030 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2031 bounds_check(cp, index, CHECK_NULL);
2032 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2033 return res;
2034 }
2035 JVM_END
2036
2037 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2038 {
2039 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2040 JvmtiVMObjectAllocEventCollector oam;
2041 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2042 bounds_check(cp, index, CHECK_NULL);
2043 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2044 return res;
2045 }
2046 JVM_END
2047
2048 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2049 {
2050 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2051 JvmtiVMObjectAllocEventCollector oam;
2052 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2053 bounds_check(cp, index, CHECK_NULL);
2054 constantTag tag = cp->tag_at(index);
2055 if (!tag.is_field_or_method()) {
2056 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2057 }
2058 int klass_ref = cp->uncached_klass_ref_index_at(index);
2059 Symbol* klass_name = cp->klass_name_at(klass_ref);
2060 Symbol* member_name = cp->uncached_name_ref_at(index);
2061 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2062 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2063 objArrayHandle dest(THREAD, dest_o);
2064 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2065 dest->obj_at_put(0, str());
2066 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2067 dest->obj_at_put(1, str());
2068 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2069 dest->obj_at_put(2, str());
2070 return (jobjectArray) JNIHandles::make_local(dest());
2071 }
2072 JVM_END
2073
2074 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2075 {
2076 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2077 JvmtiVMObjectAllocEventCollector oam;
2078 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2079 bounds_check(cp, index, CHECK_0);
2080 constantTag tag = cp->tag_at(index);
2081 if (!tag.is_field_or_method()) {
2082 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2083 }
2084 return (jint) cp->uncached_klass_ref_index_at(index);
2085 }
2086 JVM_END
2087
2088 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2089 {
2090 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2091 JvmtiVMObjectAllocEventCollector oam;
2092 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2093 bounds_check(cp, index, CHECK_0);
2094 constantTag tag = cp->tag_at(index);
2095 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2096 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2097 }
2098 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2099 }
2100 JVM_END
2101
2102 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2103 {
2104 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2105 JvmtiVMObjectAllocEventCollector oam;
2106 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2107 bounds_check(cp, index, CHECK_NULL);
2108 constantTag tag = cp->tag_at(index);
2109 if (!tag.is_name_and_type()) {
2110 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2111 }
2112 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2113 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2114 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2115 objArrayHandle dest(THREAD, dest_o);
2116 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2117 dest->obj_at_put(0, str());
2118 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2119 dest->obj_at_put(1, str());
2120 return (jobjectArray) JNIHandles::make_local(dest());
2121 }
2122 JVM_END
2123
2124 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2125 {
2126 JVMWrapper("JVM_ConstantPoolGetIntAt");
2127 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2128 bounds_check(cp, index, CHECK_0);
2129 constantTag tag = cp->tag_at(index);
2130 if (!tag.is_int()) {
2131 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2132 }
2133 return cp->int_at(index);
2134 }
2135 JVM_END
2136
2137 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2138 {
2139 JVMWrapper("JVM_ConstantPoolGetLongAt");
2140 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2141 bounds_check(cp, index, CHECK_(0L));
2142 constantTag tag = cp->tag_at(index);
2143 if (!tag.is_long()) {
2144 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2145 }
2146 return cp->long_at(index);
2147 }
2148 JVM_END
2149
2150 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2151 {
2152 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2154 bounds_check(cp, index, CHECK_(0.0f));
2155 constantTag tag = cp->tag_at(index);
2156 if (!tag.is_float()) {
2157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2158 }
2159 return cp->float_at(index);
2160 }
2161 JVM_END
2162
2163 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2164 {
2165 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2166 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2167 bounds_check(cp, index, CHECK_(0.0));
2168 constantTag tag = cp->tag_at(index);
2169 if (!tag.is_double()) {
2170 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2171 }
2172 return cp->double_at(index);
2173 }
2174 JVM_END
2175
2176 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2177 {
2178 JVMWrapper("JVM_ConstantPoolGetStringAt");
2179 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2180 bounds_check(cp, index, CHECK_NULL);
2181 constantTag tag = cp->tag_at(index);
2182 if (!tag.is_string()) {
2183 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2184 }
2185 oop str = cp->string_at(index, CHECK_NULL);
2186 return (jstring) JNIHandles::make_local(str);
2187 }
2188 JVM_END
2189
2190 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2191 {
2192 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2193 JvmtiVMObjectAllocEventCollector oam;
2194 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2195 bounds_check(cp, index, CHECK_NULL);
2196 constantTag tag = cp->tag_at(index);
2197 if (!tag.is_symbol()) {
2198 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2199 }
2200 Symbol* sym = cp->symbol_at(index);
2201 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2202 return (jstring) JNIHandles::make_local(str());
2203 }
2204 JVM_END
2205
2206 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2207 {
2208 JVMWrapper("JVM_ConstantPoolGetTagAt");
2209 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2210 bounds_check(cp, index, CHECK_0);
2211 constantTag tag = cp->tag_at(index);
2212 jbyte result = tag.value();
2213 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2214 // they are changed to the corresponding tags from the JVM spec, so that java code in
2215 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2216 if (tag.is_klass_or_reference()) {
2217 result = JVM_CONSTANT_Class;
2218 } else if (tag.is_string_index()) {
2219 result = JVM_CONSTANT_String;
2220 } else if (tag.is_method_type_in_error()) {
2221 result = JVM_CONSTANT_MethodType;
2222 } else if (tag.is_method_handle_in_error()) {
2223 result = JVM_CONSTANT_MethodHandle;
2224 } else if (tag.is_dynamic_constant_in_error()) {
2225 result = JVM_CONSTANT_Dynamic;
2226 }
2227 return result;
2228 }
2229 JVM_END
2230
2231 // Assertion support. //////////////////////////////////////////////////////////
2232
2233 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2234 JVMWrapper("JVM_DesiredAssertionStatus");
2235 assert(cls != NULL, "bad class");
2236
2237 oop r = JNIHandles::resolve(cls);
2238 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2239 if (java_lang_Class::is_primitive(r)) return false;
2240
2241 Klass* k = java_lang_Class::as_Klass(r);
2242 assert(k->is_instance_klass(), "must be an instance klass");
2243 if (!k->is_instance_klass()) return false;
2244
2245 ResourceMark rm(THREAD);
2246 const char* name = k->name()->as_C_string();
2247 bool system_class = k->class_loader() == NULL;
2248 return JavaAssertions::enabled(name, system_class);
2249
2250 JVM_END
2251
2252
2253 // Return a new AssertionStatusDirectives object with the fields filled in with
2254 // command-line assertion arguments (i.e., -ea, -da).
2255 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2256 JVMWrapper("JVM_AssertionStatusDirectives");
2257 JvmtiVMObjectAllocEventCollector oam;
2258 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2259 return JNIHandles::make_local(env, asd);
2260 JVM_END
2261
2262 // Verification ////////////////////////////////////////////////////////////////////////////////
2263
2264 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2265
2266 // RedefineClasses support: bug 6214132 caused verification to fail.
2267 // All functions from this section should call the jvmtiThreadSate function:
2268 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2269 // The function returns a Klass* of the _scratch_class if the verifier
2270 // was invoked in the middle of the class redefinition.
2271 // Otherwise it returns its argument value which is the _the_class Klass*.
2272 // Please, refer to the description in the jvmtiThreadSate.hpp.
2273
2274 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2275 JVMWrapper("JVM_GetClassNameUTF");
2276 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2277 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2278 return k->name()->as_utf8();
2279 JVM_END
2280
2281
2282 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2283 JVMWrapper("JVM_GetClassCPTypes");
2284 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2285 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2286 // types will have length zero if this is not an InstanceKlass
2287 // (length is determined by call to JVM_GetClassCPEntriesCount)
2288 if (k->is_instance_klass()) {
2289 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2290 for (int index = cp->length() - 1; index >= 0; index--) {
2291 constantTag tag = cp->tag_at(index);
2292 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2293 }
2294 }
2295 JVM_END
2296
2297
2298 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2299 JVMWrapper("JVM_GetClassCPEntriesCount");
2300 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2301 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2302 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2303 JVM_END
2304
2305
2306 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2307 JVMWrapper("JVM_GetClassFieldsCount");
2308 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2309 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2310 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2311 JVM_END
2312
2313
2314 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2315 JVMWrapper("JVM_GetClassMethodsCount");
2316 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2317 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2318 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2319 JVM_END
2320
2321
2322 // The following methods, used for the verifier, are never called with
2323 // array klasses, so a direct cast to InstanceKlass is safe.
2324 // Typically, these methods are called in a loop with bounds determined
2325 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2326 // zero for arrays.
2327 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2328 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2329 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2330 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2331 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2332 int length = method->checked_exceptions_length();
2333 if (length > 0) {
2334 CheckedExceptionElement* table= method->checked_exceptions_start();
2335 for (int i = 0; i < length; i++) {
2336 exceptions[i] = table[i].class_cp_index;
2337 }
2338 }
2339 JVM_END
2340
2341
2342 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2343 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2344 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2345 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2346 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2347 return method->checked_exceptions_length();
2348 JVM_END
2349
2350
2351 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2352 JVMWrapper("JVM_GetMethodIxByteCode");
2353 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2354 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2355 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2356 memcpy(code, method->code_base(), method->code_size());
2357 JVM_END
2358
2359
2360 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2361 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2362 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2363 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2364 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2365 return method->code_size();
2366 JVM_END
2367
2368
2369 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2370 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2371 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2372 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2373 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2374 ExceptionTable extable(method);
2375 entry->start_pc = extable.start_pc(entry_index);
2376 entry->end_pc = extable.end_pc(entry_index);
2377 entry->handler_pc = extable.handler_pc(entry_index);
2378 entry->catchType = extable.catch_type_index(entry_index);
2379 JVM_END
2380
2381
2382 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2383 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2384 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2385 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2386 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2387 return method->exception_table_length();
2388 JVM_END
2389
2390
2391 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2392 JVMWrapper("JVM_GetMethodIxModifiers");
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->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2397 JVM_END
2398
2399
2400 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2401 JVMWrapper("JVM_GetFieldIxModifiers");
2402 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2403 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2404 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2405 JVM_END
2406
2407
2408 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2409 JVMWrapper("JVM_GetMethodIxLocalsCount");
2410 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2411 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2412 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2413 return method->max_locals();
2414 JVM_END
2415
2416
2417 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2418 JVMWrapper("JVM_GetMethodIxArgsSize");
2419 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2420 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2421 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2422 return method->size_of_parameters();
2423 JVM_END
2424
2425
2426 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2427 JVMWrapper("JVM_GetMethodIxMaxStack");
2428 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2429 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2430 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2431 return method->verifier_max_stack();
2432 JVM_END
2433
2434
2435 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2436 JVMWrapper("JVM_IsConstructorIx");
2437 ResourceMark rm(THREAD);
2438 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2439 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2440 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2441 return method->name() == vmSymbols::object_initializer_name();
2442 JVM_END
2443
2444
2445 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2446 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2447 ResourceMark rm(THREAD);
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->is_overpass();
2452 JVM_END
2453
2454 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2455 JVMWrapper("JVM_GetMethodIxIxUTF");
2456 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2457 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2458 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2459 return method->name()->as_utf8();
2460 JVM_END
2461
2462
2463 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2464 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2465 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2466 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2467 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2468 return method->signature()->as_utf8();
2469 JVM_END
2470
2471 /**
2472 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2473 * read entries in the constant pool. Since the old verifier always
2474 * works on a copy of the code, it will not see any rewriting that
2475 * may possibly occur in the middle of verification. So it is important
2476 * that nothing it calls tries to use the cpCache instead of the raw
2477 * constant pool, so we must use cp->uncached_x methods when appropriate.
2478 */
2479 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2480 JVMWrapper("JVM_GetCPFieldNameUTF");
2481 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2482 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2483 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2484 switch (cp->tag_at(cp_index).value()) {
2485 case JVM_CONSTANT_Fieldref:
2486 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2487 default:
2488 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2489 }
2490 ShouldNotReachHere();
2491 return NULL;
2492 JVM_END
2493
2494
2495 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2496 JVMWrapper("JVM_GetCPMethodNameUTF");
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_name_ref_at(cp_index)->as_utf8();
2504 default:
2505 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2506 }
2507 ShouldNotReachHere();
2508 return NULL;
2509 JVM_END
2510
2511
2512 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2513 JVMWrapper("JVM_GetCPMethodSignatureUTF");
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_InterfaceMethodref:
2519 case JVM_CONSTANT_Methodref:
2520 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2521 default:
2522 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2523 }
2524 ShouldNotReachHere();
2525 return NULL;
2526 JVM_END
2527
2528
2529 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2530 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2531 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2532 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2533 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2534 switch (cp->tag_at(cp_index).value()) {
2535 case JVM_CONSTANT_Fieldref:
2536 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2537 default:
2538 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2539 }
2540 ShouldNotReachHere();
2541 return NULL;
2542 JVM_END
2543
2544
2545 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2546 JVMWrapper("JVM_GetCPClassNameUTF");
2547 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2548 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2549 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2550 Symbol* classname = cp->klass_name_at(cp_index);
2551 return classname->as_utf8();
2552 JVM_END
2553
2554
2555 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2556 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2557 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2558 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2559 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2560 switch (cp->tag_at(cp_index).value()) {
2561 case JVM_CONSTANT_Fieldref: {
2562 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2563 Symbol* classname = cp->klass_name_at(class_index);
2564 return classname->as_utf8();
2565 }
2566 default:
2567 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2568 }
2569 ShouldNotReachHere();
2570 return NULL;
2571 JVM_END
2572
2573
2574 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2575 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2576 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2577 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2578 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2579 switch (cp->tag_at(cp_index).value()) {
2580 case JVM_CONSTANT_Methodref:
2581 case JVM_CONSTANT_InterfaceMethodref: {
2582 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2583 Symbol* classname = cp->klass_name_at(class_index);
2584 return classname->as_utf8();
2585 }
2586 default:
2587 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2588 }
2589 ShouldNotReachHere();
2590 return NULL;
2591 JVM_END
2592
2593
2594 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2595 JVMWrapper("JVM_GetCPFieldModifiers");
2596 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2597 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2598 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2599 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2600 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2601 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2602 switch (cp->tag_at(cp_index).value()) {
2603 case JVM_CONSTANT_Fieldref: {
2604 Symbol* name = cp->uncached_name_ref_at(cp_index);
2605 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2606 InstanceKlass* ik = InstanceKlass::cast(k_called);
2607 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2608 if (fs.name() == name && fs.signature() == signature) {
2609 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2610 }
2611 }
2612 return -1;
2613 }
2614 default:
2615 fatal("JVM_GetCPFieldModifiers: illegal constant");
2616 }
2617 ShouldNotReachHere();
2618 return 0;
2619 JVM_END
2620
2621
2622 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2623 JVMWrapper("JVM_GetCPMethodModifiers");
2624 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2625 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2626 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2627 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2628 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2629 switch (cp->tag_at(cp_index).value()) {
2630 case JVM_CONSTANT_Methodref:
2631 case JVM_CONSTANT_InterfaceMethodref: {
2632 Symbol* name = cp->uncached_name_ref_at(cp_index);
2633 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2634 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2635 int methods_count = methods->length();
2636 for (int i = 0; i < methods_count; i++) {
2637 Method* method = methods->at(i);
2638 if (method->name() == name && method->signature() == signature) {
2639 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2640 }
2641 }
2642 return -1;
2643 }
2644 default:
2645 fatal("JVM_GetCPMethodModifiers: illegal constant");
2646 }
2647 ShouldNotReachHere();
2648 return 0;
2649 JVM_END
2650
2651
2652 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2653
2654 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2655 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2656 JVM_END
2657
2658
2659 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2660 JVMWrapper("JVM_IsSameClassPackage");
2661 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2662 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2663 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2664 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2665 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2666 JVM_END
2667
2668 // Printing support //////////////////////////////////////////////////
2669 extern "C" {
2670
2671 ATTRIBUTE_PRINTF(3, 0)
2672 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2673 // Reject count values that are negative signed values converted to
2674 // unsigned; see bug 4399518, 4417214
2675 if ((intptr_t)count <= 0) return -1;
2676
2677 int result = os::vsnprintf(str, count, fmt, args);
2678 if (result > 0 && (size_t)result >= count) {
2679 result = -1;
2680 }
2681
2682 return result;
2683 }
2684
2685 ATTRIBUTE_PRINTF(3, 4)
2686 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2687 va_list args;
2688 int len;
2689 va_start(args, fmt);
2690 len = jio_vsnprintf(str, count, fmt, args);
2691 va_end(args);
2692 return len;
2693 }
2694
2695 ATTRIBUTE_PRINTF(2, 3)
2696 int jio_fprintf(FILE* f, const char *fmt, ...) {
2697 int len;
2698 va_list args;
2699 va_start(args, fmt);
2700 len = jio_vfprintf(f, fmt, args);
2701 va_end(args);
2702 return len;
2703 }
2704
2705 ATTRIBUTE_PRINTF(2, 0)
2706 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2707 if (Arguments::vfprintf_hook() != NULL) {
2708 return Arguments::vfprintf_hook()(f, fmt, args);
2709 } else {
2710 return vfprintf(f, fmt, args);
2711 }
2712 }
2713
2714 ATTRIBUTE_PRINTF(1, 2)
2715 JNIEXPORT int jio_printf(const char *fmt, ...) {
2716 int len;
2717 va_list args;
2718 va_start(args, fmt);
2719 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2720 va_end(args);
2721 return len;
2722 }
2723
2724 // HotSpot specific jio method
2725 void jio_print(const char* s, size_t len) {
2726 // Try to make this function as atomic as possible.
2727 if (Arguments::vfprintf_hook() != NULL) {
2728 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2729 } else {
2730 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2731 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2732 }
2733 }
2734
2735 } // Extern C
2736
2737 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2738
2739 // In most of the JVM thread support functions we need to access the
2740 // thread through a ThreadsListHandle to prevent it from exiting and
2741 // being reclaimed while we try to operate on it. The exceptions to this
2742 // rule are when operating on the current thread, or if the monitor of
2743 // the target java.lang.Thread is locked at the Java level - in both
2744 // cases the target cannot exit.
2745
2746 static void thread_entry(JavaThread* thread, TRAPS) {
2747 HandleMark hm(THREAD);
2748 Handle obj(THREAD, thread->threadObj());
2749 JavaValue result(T_VOID);
2750 JavaCalls::call_virtual(&result,
2751 obj,
2752 SystemDictionary::Thread_klass(),
2753 vmSymbols::run_method_name(),
2754 vmSymbols::void_method_signature(),
2755 THREAD);
2756 }
2757
2758
2759 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2760 JVMWrapper("JVM_StartThread");
2761 JavaThread *native_thread = NULL;
2762
2763 // We cannot hold the Threads_lock when we throw an exception,
2764 // due to rank ordering issues. Example: we might need to grab the
2765 // Heap_lock while we construct the exception.
2766 bool throw_illegal_thread_state = false;
2767
2768 // We must release the Threads_lock before we can post a jvmti event
2769 // in Thread::start.
2770 {
2771 // Ensure that the C++ Thread and OSThread structures aren't freed before
2772 // we operate.
2773 MutexLocker mu(Threads_lock);
2774
2775 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2776 // re-starting an already started thread, so we should usually find
2777 // that the JavaThread is null. However for a JNI attached thread
2778 // there is a small window between the Thread object being created
2779 // (with its JavaThread set) and the update to its threadStatus, so we
2780 // have to check for this
2781 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2782 throw_illegal_thread_state = true;
2783 } else {
2784 // We could also check the stillborn flag to see if this thread was already stopped, but
2785 // for historical reasons we let the thread detect that itself when it starts running
2786
2787 jlong size =
2788 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2789 // Allocate the C++ Thread structure and create the native thread. The
2790 // stack size retrieved from java is 64-bit signed, but the constructor takes
2791 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2792 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2793 // - Avoid passing negative values which would result in really large stacks.
2794 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2795 size_t sz = size > 0 ? (size_t) size : 0;
2796 native_thread = new JavaThread(&thread_entry, sz);
2797
2798 // At this point it may be possible that no osthread was created for the
2799 // JavaThread due to lack of memory. Check for this situation and throw
2800 // an exception if necessary. Eventually we may want to change this so
2801 // that we only grab the lock if the thread was created successfully -
2802 // then we can also do this check and throw the exception in the
2803 // JavaThread constructor.
2804 if (native_thread->osthread() != NULL) {
2805 // Note: the current thread is not being used within "prepare".
2806 native_thread->prepare(jthread);
2807 }
2808 }
2809 }
2810
2811 if (throw_illegal_thread_state) {
2812 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2813 }
2814
2815 assert(native_thread != NULL, "Starting null thread?");
2816
2817 if (native_thread->osthread() == NULL) {
2818 // No one should hold a reference to the 'native_thread'.
2819 native_thread->smr_delete();
2820 if (JvmtiExport::should_post_resource_exhausted()) {
2821 JvmtiExport::post_resource_exhausted(
2822 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2823 os::native_thread_creation_failed_msg());
2824 }
2825 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2826 os::native_thread_creation_failed_msg());
2827 }
2828
2829 Thread::start(native_thread);
2830
2831 JVM_END
2832
2833
2834 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2835 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2836 // but is thought to be reliable and simple. In the case, where the receiver is the
2837 // same thread as the sender, no VM_Operation is needed.
2838 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2839 JVMWrapper("JVM_StopThread");
2840
2841 // A nested ThreadsListHandle will grab the Threads_lock so create
2842 // tlh before we resolve throwable.
2843 ThreadsListHandle tlh(thread);
2844 oop java_throwable = JNIHandles::resolve(throwable);
2845 if (java_throwable == NULL) {
2846 THROW(vmSymbols::java_lang_NullPointerException());
2847 }
2848 oop java_thread = NULL;
2849 JavaThread* receiver = NULL;
2850 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2851 Events::log_exception(thread,
2852 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2853 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2854
2855 if (is_alive) {
2856 // jthread refers to a live JavaThread.
2857 if (thread == receiver) {
2858 // Exception is getting thrown at self so no VM_Operation needed.
2859 THROW_OOP(java_throwable);
2860 } else {
2861 // Use a VM_Operation to throw the exception.
2862 Thread::send_async_exception(java_thread, java_throwable);
2863 }
2864 } else {
2865 // Either:
2866 // - target thread has not been started before being stopped, or
2867 // - target thread already terminated
2868 // We could read the threadStatus to determine which case it is
2869 // but that is overkill as it doesn't matter. We must set the
2870 // stillborn flag for the first case, and if the thread has already
2871 // exited setting this flag has no effect.
2872 java_lang_Thread::set_stillborn(java_thread);
2873 }
2874 JVM_END
2875
2876
2877 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2878 JVMWrapper("JVM_IsThreadAlive");
2879
2880 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2881 return java_lang_Thread::is_alive(thread_oop);
2882 JVM_END
2883
2884
2885 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2886 JVMWrapper("JVM_SuspendThread");
2887
2888 ThreadsListHandle tlh(thread);
2889 JavaThread* receiver = NULL;
2890 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2891 if (is_alive) {
2892 // jthread refers to a live JavaThread.
2893 {
2894 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2895 if (receiver->is_external_suspend()) {
2896 // Don't allow nested external suspend requests. We can't return
2897 // an error from this interface so just ignore the problem.
2898 return;
2899 }
2900 if (receiver->is_exiting()) { // thread is in the process of exiting
2901 return;
2902 }
2903 receiver->set_external_suspend();
2904 }
2905
2906 // java_suspend() will catch threads in the process of exiting
2907 // and will ignore them.
2908 receiver->java_suspend();
2909
2910 // It would be nice to have the following assertion in all the
2911 // time, but it is possible for a racing resume request to have
2912 // resumed this thread right after we suspended it. Temporarily
2913 // enable this assertion if you are chasing a different kind of
2914 // bug.
2915 //
2916 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2917 // receiver->is_being_ext_suspended(), "thread is not suspended");
2918 }
2919 JVM_END
2920
2921
2922 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2923 JVMWrapper("JVM_ResumeThread");
2924
2925 ThreadsListHandle tlh(thread);
2926 JavaThread* receiver = NULL;
2927 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2928 if (is_alive) {
2929 // jthread refers to a live JavaThread.
2930
2931 // This is the original comment for this Threads_lock grab:
2932 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2933 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2934 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2935 // looks at it.
2936 //
2937 // The above comment dates back to when we had both internal and
2938 // external suspend APIs that shared a common underlying mechanism.
2939 // External suspend is now entirely cooperative and doesn't share
2940 // anything with internal suspend. That said, there are some
2941 // assumptions in the VM that an external resume grabs the
2942 // Threads_lock. We can't drop the Threads_lock grab here until we
2943 // resolve the assumptions that exist elsewhere.
2944 //
2945 MutexLocker ml(Threads_lock);
2946 receiver->java_resume();
2947 }
2948 JVM_END
2949
2950
2951 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2952 JVMWrapper("JVM_SetThreadPriority");
2953
2954 ThreadsListHandle tlh(thread);
2955 oop java_thread = NULL;
2956 JavaThread* receiver = NULL;
2957 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2958 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2959
2960 if (is_alive) {
2961 // jthread refers to a live JavaThread.
2962 Thread::set_priority(receiver, (ThreadPriority)prio);
2963 }
2964 // Implied else: If the JavaThread hasn't started yet, then the
2965 // priority set in the java.lang.Thread object above will be pushed
2966 // down when it does start.
2967 JVM_END
2968
2969
2970 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2971 JVMWrapper("JVM_Yield");
2972 if (os::dont_yield()) return;
2973 HOTSPOT_THREAD_YIELD();
2974 os::naked_yield();
2975 JVM_END
2976
2977 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
2978 assert(event != NULL, "invariant");
2979 assert(event->should_commit(), "invariant");
2980 event->set_time(millis);
2981 event->commit();
2982 }
2983
2984 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2985 JVMWrapper("JVM_Sleep");
2986
2987 if (millis < 0) {
2988 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2989 }
2990
2991 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
2992 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2993 }
2994
2995 // Save current thread state and restore it at the end of this block.
2996 // And set new thread state to SLEEPING.
2997 JavaThreadSleepState jtss(thread);
2998
2999 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3000 EventThreadSleep event;
3001
3002 if (millis == 0) {
3003 os::naked_yield();
3004 } else {
3005 ThreadState old_state = thread->osthread()->get_state();
3006 thread->osthread()->set_state(SLEEPING);
3007 if (!thread->sleep(millis)) { // interrupted
3008 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3009 // us while we were sleeping. We do not overwrite those.
3010 if (!HAS_PENDING_EXCEPTION) {
3011 if (event.should_commit()) {
3012 post_thread_sleep_event(&event, millis);
3013 }
3014 HOTSPOT_THREAD_SLEEP_END(1);
3015
3016 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3017 // to properly restore the thread state. That's likely wrong.
3018 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3019 }
3020 }
3021 thread->osthread()->set_state(old_state);
3022 }
3023 if (event.should_commit()) {
3024 post_thread_sleep_event(&event, millis);
3025 }
3026 HOTSPOT_THREAD_SLEEP_END(0);
3027 JVM_END
3028
3029 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3030 JVMWrapper("JVM_CurrentThread");
3031 oop jthread = thread->threadObj();
3032 assert (thread != NULL, "no current thread!");
3033 return JNIHandles::make_local(env, jthread);
3034 JVM_END
3035
3036 class CountStackFramesTC : public ThreadClosure {
3037 int _count;
3038 bool _suspended;
3039 public:
3040 CountStackFramesTC() : _count(0), _suspended(false) {}
3041 virtual void do_thread(Thread* thread) {
3042 JavaThread* jt = (JavaThread*)thread;
3043 if (!jt->is_external_suspend()) {
3044 // To keep same behavior we fail this operation,
3045 // even if it would work perfectly.
3046 return;
3047 }
3048 _suspended = true;
3049 // Count all java activation, i.e., number of vframes.
3050 for (vframeStream vfst(jt); !vfst.at_end(); vfst.next()) {
3051 // Native frames are not counted.
3052 if (!vfst.method()->is_native()) _count++;
3053 }
3054 }
3055 int count() { return _count; }
3056 int suspended() { return _suspended; }
3057 };
3058
3059 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3060 JVMWrapper("JVM_CountStackFrames");
3061
3062 ThreadsListHandle tlh(thread);
3063 JavaThread* receiver = NULL;
3064 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3065 if (is_alive) {
3066 // jthread refers to a live JavaThread.
3067 CountStackFramesTC csf;
3068 Handshake::execute(&csf, receiver);
3069 if (!csf.suspended()) {
3070 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3071 "this thread is not suspended");
3072 }
3073 return csf.count();
3074 }
3075 // Implied else: if JavaThread is not alive simply return a count of 0.
3076 return 0;
3077 JVM_END
3078
3079
3080 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3081 JVMWrapper("JVM_Interrupt");
3082
3083 ThreadsListHandle tlh(thread);
3084 JavaThread* receiver = NULL;
3085 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3086 if (is_alive) {
3087 // jthread refers to a live JavaThread.
3088 receiver->interrupt();
3089 }
3090 JVM_END
3091
3092
3093 JVM_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3094 JVMWrapper("JVM_IsInterrupted");
3095
3096 ThreadsListHandle tlh(thread);
3097 JavaThread* receiver = NULL;
3098 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3099 if (is_alive) {
3100 // jthread refers to a live JavaThread.
3101 return (jboolean) receiver->is_interrupted(clear_interrupted != 0);
3102 } else {
3103 return JNI_FALSE;
3104 }
3105 JVM_END
3106
3107
3108 // Return true iff the current thread has locked the object passed in
3109
3110 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3111 JVMWrapper("JVM_HoldsLock");
3112 assert(THREAD->is_Java_thread(), "sanity check");
3113 if (obj == NULL) {
3114 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3115 }
3116 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3117 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3118 JVM_END
3119
3120
3121 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3122 JVMWrapper("JVM_DumpAllStacks");
3123 VM_PrintThreads op;
3124 VMThread::execute(&op);
3125 if (JvmtiExport::should_post_data_dump()) {
3126 JvmtiExport::post_data_dump();
3127 }
3128 JVM_END
3129
3130 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3131 JVMWrapper("JVM_SetNativeThreadName");
3132
3133 // We don't use a ThreadsListHandle here because the current thread
3134 // must be alive.
3135 oop java_thread = JNIHandles::resolve_non_null(jthread);
3136 JavaThread* thr = java_lang_Thread::thread(java_thread);
3137 if (thread == thr && !thr->has_attached_via_jni()) {
3138 // Thread naming is only supported for the current thread and
3139 // we don't set the name of an attached thread to avoid stepping
3140 // on other programs.
3141 ResourceMark rm(thread);
3142 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3143 os::set_native_thread_name(thread_name);
3144 }
3145 JVM_END
3146
3147 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3148
3149 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3150 JVMWrapper("JVM_GetClassContext");
3151 ResourceMark rm(THREAD);
3152 JvmtiVMObjectAllocEventCollector oam;
3153 vframeStream vfst(thread);
3154
3155 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3156 // This must only be called from SecurityManager.getClassContext
3157 Method* m = vfst.method();
3158 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3159 m->name() == vmSymbols::getClassContext_name() &&
3160 m->signature() == vmSymbols::void_class_array_signature())) {
3161 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3162 }
3163 }
3164
3165 // Collect method holders
3166 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3167 for (; !vfst.at_end(); vfst.security_next()) {
3168 Method* m = vfst.method();
3169 // Native frames are not returned
3170 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3171 Klass* holder = m->method_holder();
3172 assert(holder->is_klass(), "just checking");
3173 klass_array->append(holder);
3174 }
3175 }
3176
3177 // Create result array of type [Ljava/lang/Class;
3178 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3179 // Fill in mirrors corresponding to method holders
3180 for (int i = 0; i < klass_array->length(); i++) {
3181 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3182 }
3183
3184 return (jobjectArray) JNIHandles::make_local(env, result);
3185 JVM_END
3186
3187
3188 // java.lang.Package ////////////////////////////////////////////////////////////////
3189
3190
3191 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3192 JVMWrapper("JVM_GetSystemPackage");
3193 ResourceMark rm(THREAD);
3194 JvmtiVMObjectAllocEventCollector oam;
3195 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3196 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3197 return (jstring) JNIHandles::make_local(result);
3198 JVM_END
3199
3200
3201 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3202 JVMWrapper("JVM_GetSystemPackages");
3203 JvmtiVMObjectAllocEventCollector oam;
3204 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3205 return (jobjectArray) JNIHandles::make_local(result);
3206 JVM_END
3207
3208
3209 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3210
3211
3212 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3213 JVMWrapper("JVM_GetAndClearReferencePendingList");
3214
3215 MonitorLocker ml(Heap_lock);
3216 oop ref = Universe::reference_pending_list();
3217 if (ref != NULL) {
3218 Universe::set_reference_pending_list(NULL);
3219 }
3220 return JNIHandles::make_local(env, ref);
3221 JVM_END
3222
3223 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3224 JVMWrapper("JVM_HasReferencePendingList");
3225 MonitorLocker ml(Heap_lock);
3226 return Universe::has_reference_pending_list();
3227 JVM_END
3228
3229 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3230 JVMWrapper("JVM_WaitForReferencePendingList");
3231 MonitorLocker ml(Heap_lock);
3232 while (!Universe::has_reference_pending_list()) {
3233 ml.wait();
3234 }
3235 JVM_END
3236
3237
3238 // ObjectInputStream ///////////////////////////////////////////////////////////////
3239
3240 // Return the first user-defined class loader up the execution stack, or null
3241 // if only code from the bootstrap or platform class loader is on the stack.
3242
3243 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3244 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3245 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3246 oop loader = vfst.method()->method_holder()->class_loader();
3247 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3248 return JNIHandles::make_local(env, loader);
3249 }
3250 }
3251 return NULL;
3252 JVM_END
3253
3254
3255 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3256
3257
3258 // resolve array handle and check arguments
3259 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3260 if (arr == NULL) {
3261 THROW_0(vmSymbols::java_lang_NullPointerException());
3262 }
3263 oop a = JNIHandles::resolve_non_null(arr);
3264 if (!a->is_array()) {
3265 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3266 } else if (type_array_only && !a->is_typeArray()) {
3267 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3268 }
3269 return arrayOop(a);
3270 }
3271
3272
3273 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3274 JVMWrapper("JVM_GetArrayLength");
3275 arrayOop a = check_array(env, arr, false, CHECK_0);
3276 return a->length();
3277 JVM_END
3278
3279
3280 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3281 JVMWrapper("JVM_Array_Get");
3282 JvmtiVMObjectAllocEventCollector oam;
3283 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3284 jvalue value;
3285 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3286 oop box = Reflection::box(&value, type, CHECK_NULL);
3287 return JNIHandles::make_local(env, box);
3288 JVM_END
3289
3290
3291 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3292 JVMWrapper("JVM_GetPrimitiveArrayElement");
3293 jvalue value;
3294 value.i = 0; // to initialize value before getting used in CHECK
3295 arrayOop a = check_array(env, arr, true, CHECK_(value));
3296 assert(a->is_typeArray(), "just checking");
3297 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3298 BasicType wide_type = (BasicType) wCode;
3299 if (type != wide_type) {
3300 Reflection::widen(&value, type, wide_type, CHECK_(value));
3301 }
3302 return value;
3303 JVM_END
3304
3305
3306 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3307 JVMWrapper("JVM_SetArrayElement");
3308 arrayOop a = check_array(env, arr, false, CHECK);
3309 oop box = JNIHandles::resolve(val);
3310 jvalue value;
3311 value.i = 0; // to initialize value before getting used in CHECK
3312 BasicType value_type;
3313 if (a->is_objArray()) {
3314 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3315 value_type = Reflection::unbox_for_regular_object(box, &value);
3316 } else {
3317 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3318 }
3319 Reflection::array_set(&value, a, index, value_type, CHECK);
3320 JVM_END
3321
3322
3323 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3324 JVMWrapper("JVM_SetPrimitiveArrayElement");
3325 arrayOop a = check_array(env, arr, true, CHECK);
3326 assert(a->is_typeArray(), "just checking");
3327 BasicType value_type = (BasicType) vCode;
3328 Reflection::array_set(&v, a, index, value_type, CHECK);
3329 JVM_END
3330
3331
3332 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3333 JVMWrapper("JVM_NewArray");
3334 JvmtiVMObjectAllocEventCollector oam;
3335 oop element_mirror = JNIHandles::resolve(eltClass);
3336 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3337 return JNIHandles::make_local(env, result);
3338 JVM_END
3339
3340
3341 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3342 JVMWrapper("JVM_NewMultiArray");
3343 JvmtiVMObjectAllocEventCollector oam;
3344 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3345 oop element_mirror = JNIHandles::resolve(eltClass);
3346 assert(dim_array->is_typeArray(), "just checking");
3347 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3348 return JNIHandles::make_local(env, result);
3349 JVM_END
3350
3351
3352 // Library support ///////////////////////////////////////////////////////////////////////////
3353
3354 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3355 //%note jvm_ct
3356 JVMWrapper("JVM_LoadLibrary");
3357 char ebuf[1024];
3358 void *load_result;
3359 {
3360 ThreadToNativeFromVM ttnfvm(thread);
3361 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3362 }
3363 if (load_result == NULL) {
3364 char msg[1024];
3365 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3366 // Since 'ebuf' may contain a string encoded using
3367 // platform encoding scheme, we need to pass
3368 // Exceptions::unsafe_to_utf8 to the new_exception method
3369 // as the last argument. See bug 6367357.
3370 Handle h_exception =
3371 Exceptions::new_exception(thread,
3372 vmSymbols::java_lang_UnsatisfiedLinkError(),
3373 msg, Exceptions::unsafe_to_utf8);
3374
3375 THROW_HANDLE_0(h_exception);
3376 }
3377 return load_result;
3378 JVM_END
3379
3380
3381 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3382 JVMWrapper("JVM_UnloadLibrary");
3383 os::dll_unload(handle);
3384 JVM_END
3385
3386
3387 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3388 JVMWrapper("JVM_FindLibraryEntry");
3389 return os::dll_lookup(handle, name);
3390 JVM_END
3391
3392
3393 // JNI version ///////////////////////////////////////////////////////////////////////////////
3394
3395 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3396 JVMWrapper("JVM_IsSupportedJNIVersion");
3397 return Threads::is_supported_jni_version_including_1_1(version);
3398 JVM_END
3399
3400
3401 // String support ///////////////////////////////////////////////////////////////////////////
3402
3403 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3404 JVMWrapper("JVM_InternString");
3405 JvmtiVMObjectAllocEventCollector oam;
3406 if (str == NULL) return NULL;
3407 oop string = JNIHandles::resolve_non_null(str);
3408 oop result = StringTable::intern(string, CHECK_NULL);
3409 return (jstring) JNIHandles::make_local(env, result);
3410 JVM_END
3411
3412
3413 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3414
3415 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3416 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3417 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3418 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3419 // nature. JavaThreads will be "in native" when using this API from JDK code.
3420
3421
3422 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3423 VM_Exit::block_if_vm_exited();
3424 JVMWrapper("JVM_RawMonitorCreate");
3425 return new os::PlatformMutex();
3426 }
3427
3428
3429 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3430 VM_Exit::block_if_vm_exited();
3431 JVMWrapper("JVM_RawMonitorDestroy");
3432 delete ((os::PlatformMutex*) mon);
3433 }
3434
3435
3436 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3437 VM_Exit::block_if_vm_exited();
3438 JVMWrapper("JVM_RawMonitorEnter");
3439 ((os::PlatformMutex*) mon)->lock();
3440 return 0;
3441 }
3442
3443
3444 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3445 VM_Exit::block_if_vm_exited();
3446 JVMWrapper("JVM_RawMonitorExit");
3447 ((os::PlatformMutex*) mon)->unlock();
3448 }
3449
3450
3451 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3452
3453 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, jboolean link,
3454 Handle loader, Handle protection_domain,
3455 jboolean throwError, TRAPS) {
3456 // Initialization also implies linking - check for coherent args
3457 assert((init && link) || !init, "incorrect use of init/link arguments");
3458
3459 // Security Note:
3460 // The Java level wrapper will perform the necessary security check allowing
3461 // us to pass the NULL as the initiating class loader. The VM is responsible for
3462 // the checkPackageAccess relative to the initiating class loader via the
3463 // protection_domain. The protection_domain is passed as NULL by the java code
3464 // if there is no security manager in 3-arg Class.forName().
3465 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3466
3467 // Check if we should initialize the class (which implies linking), or just link it
3468 if (init && klass->is_instance_klass()) {
3469 klass->initialize(CHECK_NULL);
3470 } else if (link && klass->is_instance_klass()) {
3471 InstanceKlass::cast(klass)->link_class(CHECK_NULL);
3472 }
3473 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3474 }
3475
3476
3477 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3478
3479 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3480 JVMWrapper("JVM_InvokeMethod");
3481 Handle method_handle;
3482 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3483 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3484 Handle receiver(THREAD, JNIHandles::resolve(obj));
3485 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3486 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3487 jobject res = JNIHandles::make_local(env, result);
3488 if (JvmtiExport::should_post_vm_object_alloc()) {
3489 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3490 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3491 if (java_lang_Class::is_primitive(ret_type)) {
3492 // Only for primitive type vm allocates memory for java object.
3493 // See box() method.
3494 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3495 }
3496 }
3497 return res;
3498 } else {
3499 THROW_0(vmSymbols::java_lang_StackOverflowError());
3500 }
3501 JVM_END
3502
3503
3504 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3505 JVMWrapper("JVM_NewInstanceFromConstructor");
3506 oop constructor_mirror = JNIHandles::resolve(c);
3507 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3508 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3509 jobject res = JNIHandles::make_local(env, result);
3510 if (JvmtiExport::should_post_vm_object_alloc()) {
3511 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3512 }
3513 return res;
3514 JVM_END
3515
3516 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3517
3518 JVM_LEAF(jboolean, JVM_SupportsCX8())
3519 JVMWrapper("JVM_SupportsCX8");
3520 return VM_Version::supports_cx8();
3521 JVM_END
3522
3523 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3524 JVMWrapper("JVM_InitializeFromArchive");
3525 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3526 assert(k->is_klass(), "just checking");
3527 HeapShared::initialize_from_archived_subgraph(k);
3528 JVM_END
3529
3530 // Returns an array of all live Thread objects (VM internal JavaThreads,
3531 // jvmti agent threads, and JNI attaching threads are skipped)
3532 // See CR 6404306 regarding JNI attaching threads
3533 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3534 ResourceMark rm(THREAD);
3535 ThreadsListEnumerator tle(THREAD, false, false);
3536 JvmtiVMObjectAllocEventCollector oam;
3537
3538 int num_threads = tle.num_threads();
3539 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3540 objArrayHandle threads_ah(THREAD, r);
3541
3542 for (int i = 0; i < num_threads; i++) {
3543 Handle h = tle.get_threadObj(i);
3544 threads_ah->obj_at_put(i, h());
3545 }
3546
3547 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3548 JVM_END
3549
3550
3551 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3552 // Return StackTraceElement[][], each element is the stack trace of a thread in
3553 // the corresponding entry in the given threads array
3554 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3555 JVMWrapper("JVM_DumpThreads");
3556 JvmtiVMObjectAllocEventCollector oam;
3557
3558 // Check if threads is null
3559 if (threads == NULL) {
3560 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3561 }
3562
3563 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3564 objArrayHandle ah(THREAD, a);
3565 int num_threads = ah->length();
3566 // check if threads is non-empty array
3567 if (num_threads == 0) {
3568 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3569 }
3570
3571 // check if threads is not an array of objects of Thread class
3572 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3573 if (k != SystemDictionary::Thread_klass()) {
3574 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3575 }
3576
3577 ResourceMark rm(THREAD);
3578
3579 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3580 for (int i = 0; i < num_threads; i++) {
3581 oop thread_obj = ah->obj_at(i);
3582 instanceHandle h(THREAD, (instanceOop) thread_obj);
3583 thread_handle_array->append(h);
3584 }
3585
3586 // The JavaThread references in thread_handle_array are validated
3587 // in VM_ThreadDump::doit().
3588 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3589 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3590
3591 JVM_END
3592
3593 // JVM monitoring and management support
3594 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3595 return Management::get_jmm_interface(version);
3596 JVM_END
3597
3598 // com.sun.tools.attach.VirtualMachine agent properties support
3599 //
3600 // Initialize the agent properties with the properties maintained in the VM
3601 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3602 JVMWrapper("JVM_InitAgentProperties");
3603 ResourceMark rm;
3604
3605 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3606
3607 PUTPROP(props, "sun.java.command", Arguments::java_command());
3608 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3609 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3610 return properties;
3611 JVM_END
3612
3613 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3614 {
3615 JVMWrapper("JVM_GetEnclosingMethodInfo");
3616 JvmtiVMObjectAllocEventCollector oam;
3617
3618 if (ofClass == NULL) {
3619 return NULL;
3620 }
3621 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3622 // Special handling for primitive objects
3623 if (java_lang_Class::is_primitive(mirror())) {
3624 return NULL;
3625 }
3626 Klass* k = java_lang_Class::as_Klass(mirror());
3627 if (!k->is_instance_klass()) {
3628 return NULL;
3629 }
3630 InstanceKlass* ik = InstanceKlass::cast(k);
3631 int encl_method_class_idx = ik->enclosing_method_class_index();
3632 if (encl_method_class_idx == 0) {
3633 return NULL;
3634 }
3635 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3636 objArrayHandle dest(THREAD, dest_o);
3637 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3638 dest->obj_at_put(0, enc_k->java_mirror());
3639 int encl_method_method_idx = ik->enclosing_method_method_index();
3640 if (encl_method_method_idx != 0) {
3641 Symbol* sym = ik->constants()->symbol_at(
3642 extract_low_short_from_int(
3643 ik->constants()->name_and_type_at(encl_method_method_idx)));
3644 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3645 dest->obj_at_put(1, str());
3646 sym = ik->constants()->symbol_at(
3647 extract_high_short_from_int(
3648 ik->constants()->name_and_type_at(encl_method_method_idx)));
3649 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3650 dest->obj_at_put(2, str());
3651 }
3652 return (jobjectArray) JNIHandles::make_local(dest());
3653 }
3654 JVM_END
3655
3656 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3657 {
3658 memset(info, 0, info_size);
3659
3660 info->jvm_version = VM_Version::jvm_version();
3661 info->patch_version = VM_Version::vm_patch_version();
3662
3663 // when we add a new capability in the jvm_version_info struct, we should also
3664 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3665 // counter defined in runtimeService.cpp.
3666 info->is_attach_supported = AttachListener::is_attach_supported();
3667 }
3668 JVM_END
3669
3670 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3671 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3672 ResourceMark rm(THREAD);
3673
3674 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3675 return NULL;
3676 }
3677
3678 char** vm_flags = Arguments::jvm_flags_array();
3679 char** vm_args = Arguments::jvm_args_array();
3680 int num_flags = Arguments::num_jvm_flags();
3681 int num_args = Arguments::num_jvm_args();
3682
3683 InstanceKlass* ik = SystemDictionary::String_klass();
3684 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3685 objArrayHandle result_h(THREAD, r);
3686
3687 int index = 0;
3688 for (int j = 0; j < num_flags; j++, index++) {
3689 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3690 result_h->obj_at_put(index, h());
3691 }
3692 for (int i = 0; i < num_args; i++, index++) {
3693 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3694 result_h->obj_at_put(index, h());
3695 }
3696 return (jobjectArray) JNIHandles::make_local(env, result_h());
3697 JVM_END
3698
3699 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3700 return os::get_signal_number(name);
3701 JVM_END