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 "oops/valueArrayKlass.hpp"
57 #include "prims/jvm_misc.hpp"
58 #include "prims/jvmtiExport.hpp"
59 #include "prims/jvmtiThreadState.hpp"
60 #include "prims/nativeLookup.hpp"
61 #include "prims/stackwalk.hpp"
62 #include "runtime/arguments.hpp"
63 #include "runtime/atomic.hpp"
64 #include "runtime/handles.inline.hpp"
65 #include "runtime/init.hpp"
66 #include "runtime/interfaceSupport.inline.hpp"
67 #include "runtime/deoptimization.hpp"
68 #include "runtime/handshake.hpp"
69 #include "runtime/java.hpp"
70 #include "runtime/javaCalls.hpp"
71 #include "runtime/jfieldIDWorkaround.hpp"
72 #include "runtime/jniHandles.inline.hpp"
73 #include "runtime/orderAccess.hpp"
74 #include "runtime/os.inline.hpp"
75 #include "runtime/perfData.hpp"
76 #include "runtime/reflection.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 Universe::heap()->collect(GCCause::_java_lang_system_gc);
489 }
490 JVM_END
491
492
493 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
494 JVMWrapper("JVM_MaxObjectInspectionAge");
495 return Universe::heap()->millis_since_last_gc();
496 JVM_END
497
498
499 static inline jlong convert_size_t_to_jlong(size_t val) {
500 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
501 NOT_LP64 (return (jlong)val;)
502 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
503 }
504
505 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
506 JVMWrapper("JVM_TotalMemory");
507 size_t n = Universe::heap()->capacity();
508 return convert_size_t_to_jlong(n);
509 JVM_END
510
511
512 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
513 JVMWrapper("JVM_FreeMemory");
514 size_t n = Universe::heap()->unused();
515 return convert_size_t_to_jlong(n);
516 JVM_END
517
518
519 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
520 JVMWrapper("JVM_MaxMemory");
521 size_t n = Universe::heap()->max_capacity();
522 return convert_size_t_to_jlong(n);
523 JVM_END
524
525
526 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
527 JVMWrapper("JVM_ActiveProcessorCount");
528 return os::active_processor_count();
529 JVM_END
530
531
532
533 // java.lang.Throwable //////////////////////////////////////////////////////
534
535
536 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
537 JVMWrapper("JVM_FillInStackTrace");
538 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
539 java_lang_Throwable::fill_in_stack_trace(exception);
540 JVM_END
541
542
543 // java.lang.StackTraceElement //////////////////////////////////////////////
544
545
546 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
547 JVMWrapper("JVM_InitStackTraceElementArray");
548 Handle exception(THREAD, JNIHandles::resolve(throwable));
549 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
550 objArrayHandle stack_trace(THREAD, st);
551 // Fill in the allocated stack trace
552 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
553 JVM_END
554
555
556 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
557 JVMWrapper("JVM_InitStackTraceElement");
558 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
559 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
560 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
561 JVM_END
562
563
564 // java.lang.StackWalker //////////////////////////////////////////////////////
565
566
567 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
568 jint skip_frames, jint frame_count, jint start_index,
569 jobjectArray frames))
570 JVMWrapper("JVM_CallStackWalk");
571 JavaThread* jt = (JavaThread*) THREAD;
572 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
573 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
574 }
575
576 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
577
578 // frames array is a Class<?>[] array when only getting caller reference,
579 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
580 // be null.
581 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
582 objArrayHandle frames_array_h(THREAD, fa);
583
584 int limit = start_index + frame_count;
585 if (frames_array_h->length() < limit) {
586 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
587 }
588
589 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
590 start_index, frames_array_h, CHECK_NULL);
591 return JNIHandles::make_local(env, result);
592 JVM_END
593
594
595 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
596 jint frame_count, jint start_index,
597 jobjectArray frames))
598 JVMWrapper("JVM_MoreStackWalk");
599 JavaThread* jt = (JavaThread*) THREAD;
600
601 // frames array is a Class<?>[] array when only getting caller reference,
602 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
603 // be null.
604 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
605 objArrayHandle frames_array_h(THREAD, fa);
606
607 int limit = start_index+frame_count;
608 if (frames_array_h->length() < limit) {
609 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
610 }
611
612 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
613 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
614 start_index, frames_array_h, THREAD);
615 JVM_END
616
617 // java.lang.Object ///////////////////////////////////////////////
618
619
620 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
621 JVMWrapper("JVM_IHashCode");
622 // as implemented in the classic virtual machine; return 0 if object is NULL
623 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
624 JVM_END
625
626
627 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
628 JVMWrapper("JVM_MonitorWait");
629 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
630 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
631 if (JvmtiExport::should_post_monitor_wait()) {
632 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
633
634 // The current thread already owns the monitor and it has not yet
635 // been added to the wait queue so the current thread cannot be
636 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
637 // event handler cannot accidentally consume an unpark() meant for
638 // the ParkEvent associated with this ObjectMonitor.
639 }
640 ObjectSynchronizer::wait(obj, ms, CHECK);
641 JVM_END
642
643
644 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
645 JVMWrapper("JVM_MonitorNotify");
646 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
647 ObjectSynchronizer::notify(obj, CHECK);
648 JVM_END
649
650
651 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
652 JVMWrapper("JVM_MonitorNotifyAll");
653 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
654 ObjectSynchronizer::notifyall(obj, CHECK);
655 JVM_END
656
657
658 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
659 JVMWrapper("JVM_Clone");
660 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
661 Klass* klass = obj->klass();
662 JvmtiVMObjectAllocEventCollector oam;
663
664 #ifdef ASSERT
665 // Just checking that the cloneable flag is set correct
666 if (obj->is_array()) {
667 guarantee(klass->is_cloneable(), "all arrays are cloneable");
668 } else {
669 guarantee(obj->is_instance(), "should be instanceOop");
670 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
671 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
672 }
673 #endif
674
675 // Check if class of obj supports the Cloneable interface.
676 // All arrays are considered to be cloneable (See JLS 20.1.5).
677 // All j.l.r.Reference classes are considered non-cloneable.
678 if (!klass->is_cloneable() ||
679 klass->is_value() ||
680 (klass->is_instance_klass() &&
681 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
682 ResourceMark rm(THREAD);
683 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
684 }
685
686 // Make shallow object copy
687 const int size = obj->size();
688 oop new_obj_oop = NULL;
689 if (obj->is_array()) {
690 const int length = ((arrayOop)obj())->length();
691 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
692 /* do_zero */ true, CHECK_NULL);
693 } else {
694 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
695 }
696
697 HeapAccess<>::clone(obj(), new_obj_oop, size);
698
699 Handle new_obj(THREAD, new_obj_oop);
700 // Caution: this involves a java upcall, so the clone should be
701 // "gc-robust" by this stage.
702 if (klass->has_finalizer()) {
703 assert(obj->is_instance(), "should be instanceOop");
704 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
705 new_obj = Handle(THREAD, new_obj_oop);
706 }
707
708 return JNIHandles::make_local(env, new_obj());
709 JVM_END
710
711 // java.io.File ///////////////////////////////////////////////////////////////
712
713 JVM_LEAF(char*, JVM_NativePath(char* path))
714 JVMWrapper("JVM_NativePath");
715 return os::native_path(path);
716 JVM_END
717
718
719 // Misc. class handling ///////////////////////////////////////////////////////////
720
721
722 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
723 JVMWrapper("JVM_GetCallerClass");
724
725 // Getting the class of the caller frame.
726 //
727 // The call stack at this point looks something like this:
728 //
729 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
730 // [1] [ @CallerSensitive API.method ]
731 // [.] [ (skipped intermediate frames) ]
732 // [n] [ caller ]
733 vframeStream vfst(thread);
734 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
735 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
736 Method* m = vfst.method();
737 assert(m != NULL, "sanity");
738 switch (n) {
739 case 0:
740 // This must only be called from Reflection.getCallerClass
741 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
742 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
743 }
744 // fall-through
745 case 1:
746 // Frame 0 and 1 must be caller sensitive.
747 if (!m->caller_sensitive()) {
748 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
749 }
750 break;
751 default:
752 if (!m->is_ignored_by_security_stack_walk()) {
753 // We have reached the desired frame; return the holder class.
754 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
755 }
756 break;
757 }
758 }
759 return NULL;
760 JVM_END
761
762
763 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
764 JVMWrapper("JVM_FindPrimitiveClass");
765 oop mirror = NULL;
766 BasicType t = name2type(utf);
767 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY && t != T_VALUETYPE) {
768 mirror = Universe::java_mirror(t);
769 }
770 if (mirror == NULL) {
771 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
772 } else {
773 return (jclass) JNIHandles::make_local(env, mirror);
774 }
775 JVM_END
776
777
778 // Returns a class loaded by the bootstrap class loader; or null
779 // if not found. ClassNotFoundException is not thrown.
780 // FindClassFromBootLoader is exported to the launcher for windows.
781 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
782 const char* name))
783 JVMWrapper("JVM_FindClassFromBootLoader");
784
785 // Java libraries should ensure that name is never null...
786 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
787 // It's impossible to create this class; the name cannot fit
788 // into the constant pool.
789 return NULL;
790 }
791
792 TempNewSymbol h_name = SymbolTable::new_symbol(name);
793 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
794 if (k == NULL) {
795 return NULL;
796 }
797
798 if (log_is_enabled(Debug, class, resolve)) {
799 trace_class_resolution(k);
800 }
801 return (jclass) JNIHandles::make_local(env, k->java_mirror());
802 JVM_END
803
804 // Find a class with this name in this loader, using the caller's protection domain.
805 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
806 jboolean init, jobject loader,
807 jclass caller))
808 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
809 // Java libraries should ensure that name is never null...
810 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
811 // It's impossible to create this class; the name cannot fit
812 // into the constant pool.
813 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
814 }
815
816 TempNewSymbol h_name = SymbolTable::new_symbol(name);
817
818 oop loader_oop = JNIHandles::resolve(loader);
819 oop from_class = JNIHandles::resolve(caller);
820 oop protection_domain = NULL;
821 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
822 // NPE. Put it in another way, the bootstrap class loader has all permission and
823 // thus no checkPackageAccess equivalence in the VM class loader.
824 // The caller is also passed as NULL by the java code if there is no security
825 // manager to avoid the performance cost of getting the calling class.
826 if (from_class != NULL && loader_oop != NULL) {
827 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
828 }
829
830 Handle h_loader(THREAD, loader_oop);
831 Handle h_prot(THREAD, protection_domain);
832 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
833 h_prot, false, THREAD);
834
835 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
836 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
837 }
838 return result;
839 JVM_END
840
841 // Currently only called from the old verifier.
842 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
843 jboolean init, jclass from))
844 JVMWrapper("JVM_FindClassFromClass");
845 if (name == NULL) {
846 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
847 }
848 if ((int)strlen(name) > Symbol::max_length()) {
849 // It's impossible to create this class; the name cannot fit
850 // into the constant pool.
851 Exceptions::fthrow(THREAD_AND_LOCATION,
852 vmSymbols::java_lang_NoClassDefFoundError(),
853 "Class name exceeds maximum length of %d: %s",
854 Symbol::max_length(),
855 name);
856 return 0;
857 }
858 TempNewSymbol h_name = SymbolTable::new_symbol(name);
859 oop from_class_oop = JNIHandles::resolve(from);
860 Klass* from_class = (from_class_oop == NULL)
861 ? (Klass*)NULL
862 : java_lang_Class::as_Klass(from_class_oop);
863 oop class_loader = NULL;
864 oop protection_domain = NULL;
865 if (from_class != NULL) {
866 class_loader = from_class->class_loader();
867 protection_domain = from_class->protection_domain();
868 }
869 Handle h_loader(THREAD, class_loader);
870 Handle h_prot (THREAD, protection_domain);
871 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
872 h_prot, true, thread);
873
874 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
875 // this function is generally only used for class loading during verification.
876 ResourceMark rm;
877 oop from_mirror = JNIHandles::resolve_non_null(from);
878 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
879 const char * from_name = from_class->external_name();
880
881 oop mirror = JNIHandles::resolve_non_null(result);
882 Klass* to_class = java_lang_Class::as_Klass(mirror);
883 const char * to = to_class->external_name();
884 log_debug(class, resolve)("%s %s (verification)", from_name, to);
885 }
886
887 return result;
888 JVM_END
889
890 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
891 if (loader.is_null()) {
892 return;
893 }
894
895 // check whether the current caller thread holds the lock or not.
896 // If not, increment the corresponding counter
897 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
898 ObjectSynchronizer::owner_self) {
899 counter->inc();
900 }
901 }
902
903 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
904 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
905 jobject loader, const jbyte *buf,
906 jsize len, jobject pd, const char *source,
907 TRAPS) {
908 if (source == NULL) source = "__JVM_DefineClass__";
909
910 assert(THREAD->is_Java_thread(), "must be a JavaThread");
911 JavaThread* jt = (JavaThread*) THREAD;
912
913 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
914 ClassLoader::perf_define_appclass_selftime(),
915 ClassLoader::perf_define_appclasses(),
916 jt->get_thread_stat()->perf_recursion_counts_addr(),
917 jt->get_thread_stat()->perf_timers_addr(),
918 PerfClassTraceTime::DEFINE_CLASS);
919
920 if (UsePerfData) {
921 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
922 }
923
924 // Since exceptions can be thrown, class initialization can take place
925 // if name is NULL no check for class name in .class stream has to be made.
926 TempNewSymbol class_name = NULL;
927 if (name != NULL) {
928 const int str_len = (int)strlen(name);
929 if (str_len > Symbol::max_length()) {
930 // It's impossible to create this class; the name cannot fit
931 // into the constant pool.
932 Exceptions::fthrow(THREAD_AND_LOCATION,
933 vmSymbols::java_lang_NoClassDefFoundError(),
934 "Class name exceeds maximum length of %d: %s",
935 Symbol::max_length(),
936 name);
937 return 0;
938 }
939 class_name = SymbolTable::new_symbol(name, str_len);
940 }
941
942 ResourceMark rm(THREAD);
943 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
944 Handle class_loader (THREAD, JNIHandles::resolve(loader));
945 if (UsePerfData) {
946 is_lock_held_by_thread(class_loader,
947 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
948 THREAD);
949 }
950 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
951 Klass* k = SystemDictionary::resolve_from_stream(class_name,
952 class_loader,
953 protection_domain,
954 &st,
955 CHECK_NULL);
956
957 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
958 trace_class_resolution(k);
959 }
960
961 return (jclass) JNIHandles::make_local(env, k->java_mirror());
962 }
963
964
965 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
966 JVMWrapper("JVM_DefineClass");
967
968 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
969 JVM_END
970
971
972 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
973 JVMWrapper("JVM_DefineClassWithSource");
974
975 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
976 JVM_END
977
978 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
979 JVMWrapper("JVM_FindLoadedClass");
980 ResourceMark rm(THREAD);
981
982 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
983 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
984
985 const char* str = java_lang_String::as_utf8_string(string());
986 // Sanity check, don't expect null
987 if (str == NULL) return NULL;
988
989 const int str_len = (int)strlen(str);
990 if (str_len > Symbol::max_length()) {
991 // It's impossible to create this class; the name cannot fit
992 // into the constant pool.
993 return NULL;
994 }
995 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
996
997 // Security Note:
998 // The Java level wrapper will perform the necessary security check allowing
999 // us to pass the NULL as the initiating class loader.
1000 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1001 if (UsePerfData) {
1002 is_lock_held_by_thread(h_loader,
1003 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1004 THREAD);
1005 }
1006
1007 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1008 h_loader,
1009 Handle(),
1010 CHECK_NULL);
1011 #if INCLUDE_CDS
1012 if (k == NULL) {
1013 // If the class is not already loaded, try to see if it's in the shared
1014 // archive for the current classloader (h_loader).
1015 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1016 }
1017 #endif
1018 return (k == NULL) ? NULL :
1019 (jclass) JNIHandles::make_local(env, k->java_mirror());
1020 JVM_END
1021
1022 // Module support //////////////////////////////////////////////////////////////////////////////
1023
1024 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1025 jstring location, const char* const* packages, jsize num_packages))
1026 JVMWrapper("JVM_DefineModule");
1027 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1028 JVM_END
1029
1030 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1031 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1032 Modules::set_bootloader_unnamed_module(module, CHECK);
1033 JVM_END
1034
1035 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1036 JVMWrapper("JVM_AddModuleExports");
1037 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1038 JVM_END
1039
1040 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1041 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1042 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1043 JVM_END
1044
1045 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1046 JVMWrapper("JVM_AddModuleExportsToAll");
1047 Modules::add_module_exports(from_module, package, NULL, CHECK);
1048 JVM_END
1049
1050 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1051 JVMWrapper("JVM_AddReadsModule");
1052 Modules::add_reads_module(from_module, source_module, CHECK);
1053 JVM_END
1054
1055 // Reflection support //////////////////////////////////////////////////////////////////////////////
1056
1057 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1058 assert (cls != NULL, "illegal class");
1059 JVMWrapper("JVM_InitClassName");
1060 JvmtiVMObjectAllocEventCollector oam;
1061 ResourceMark rm(THREAD);
1062 HandleMark hm(THREAD);
1063 Handle java_class(THREAD, JNIHandles::resolve(cls));
1064 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1065 return (jstring) JNIHandles::make_local(env, result);
1066 JVM_END
1067
1068
1069 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1070 JVMWrapper("JVM_GetClassInterfaces");
1071 JvmtiVMObjectAllocEventCollector oam;
1072 oop mirror = JNIHandles::resolve_non_null(cls);
1073
1074 // Special handling for primitive objects
1075 if (java_lang_Class::is_primitive(mirror)) {
1076 // Primitive objects does not have any interfaces
1077 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1078 return (jobjectArray) JNIHandles::make_local(env, r);
1079 }
1080
1081 Klass* klass = java_lang_Class::as_Klass(mirror);
1082 // Figure size of result array
1083 int size;
1084 if (klass->is_instance_klass()) {
1085 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1086 } else {
1087 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1088 size = 2;
1089 }
1090
1091 // Allocate result array
1092 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1093 objArrayHandle result (THREAD, r);
1094 // Fill in result
1095 if (klass->is_instance_klass()) {
1096 // Regular instance klass, fill in all local interfaces
1097 for (int index = 0; index < size; index++) {
1098 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1099 result->obj_at_put(index, k->java_mirror());
1100 }
1101 } else {
1102 // All arrays implement java.lang.Cloneable and java.io.Serializable
1103 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1104 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1105 }
1106 return (jobjectArray) JNIHandles::make_local(env, result());
1107 JVM_END
1108
1109
1110 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1111 JVMWrapper("JVM_IsInterface");
1112 oop mirror = JNIHandles::resolve_non_null(cls);
1113 if (java_lang_Class::is_primitive(mirror)) {
1114 return JNI_FALSE;
1115 }
1116 Klass* k = java_lang_Class::as_Klass(mirror);
1117 jboolean result = k->is_interface();
1118 assert(!result || k->is_instance_klass(),
1119 "all interfaces are instance types");
1120 // The compiler intrinsic for isInterface tests the
1121 // Klass::_access_flags bits in the same way.
1122 return result;
1123 JVM_END
1124
1125
1126 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1127 JVMWrapper("JVM_GetClassSigners");
1128 JvmtiVMObjectAllocEventCollector oam;
1129 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1130 // There are no signers for primitive types
1131 return NULL;
1132 }
1133
1134 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1135
1136 // If there are no signers set in the class, or if the class
1137 // is an array, return NULL.
1138 if (signers == NULL) return NULL;
1139
1140 // copy of the signers array
1141 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1142 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1143 for (int index = 0; index < signers->length(); index++) {
1144 signers_copy->obj_at_put(index, signers->obj_at(index));
1145 }
1146
1147 // return the copy
1148 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1149 JVM_END
1150
1151
1152 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1153 JVMWrapper("JVM_SetClassSigners");
1154 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1155 // This call is ignored for primitive types and arrays.
1156 // Signers are only set once, ClassLoader.java, and thus shouldn't
1157 // be called with an array. Only the bootstrap loader creates arrays.
1158 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1159 if (k->is_instance_klass()) {
1160 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1161 }
1162 }
1163 JVM_END
1164
1165
1166 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1167 JVMWrapper("JVM_GetProtectionDomain");
1168 if (JNIHandles::resolve(cls) == NULL) {
1169 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1170 }
1171
1172 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1173 // Primitive types does not have a protection domain.
1174 return NULL;
1175 }
1176
1177 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1178 return (jobject) JNIHandles::make_local(env, pd);
1179 JVM_END
1180
1181
1182 // Returns the inherited_access_control_context field of the running thread.
1183 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1184 JVMWrapper("JVM_GetInheritedAccessControlContext");
1185 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1186 return JNIHandles::make_local(env, result);
1187 JVM_END
1188
1189 class RegisterArrayForGC {
1190 private:
1191 JavaThread *_thread;
1192 public:
1193 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1194 _thread = thread;
1195 _thread->register_array_for_gc(array);
1196 }
1197
1198 ~RegisterArrayForGC() {
1199 _thread->register_array_for_gc(NULL);
1200 }
1201 };
1202
1203
1204 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1205 JVMWrapper("JVM_GetStackAccessControlContext");
1206 if (!UsePrivilegedStack) return NULL;
1207
1208 ResourceMark rm(THREAD);
1209 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1210 JvmtiVMObjectAllocEventCollector oam;
1211
1212 // count the protection domains on the execution stack. We collapse
1213 // duplicate consecutive protection domains into a single one, as
1214 // well as stopping when we hit a privileged frame.
1215
1216 oop previous_protection_domain = NULL;
1217 Handle privileged_context(thread, NULL);
1218 bool is_privileged = false;
1219 oop protection_domain = NULL;
1220
1221 // Iterate through Java frames
1222 vframeStream vfst(thread);
1223 for(; !vfst.at_end(); vfst.next()) {
1224 // get method of frame
1225 Method* method = vfst.method();
1226
1227 // stop at the first privileged frame
1228 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1229 method->name() == vmSymbols::executePrivileged_name())
1230 {
1231 // this frame is privileged
1232 is_privileged = true;
1233
1234 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1235
1236 StackValueCollection* locals = priv->locals();
1237 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1238 StackValue* clr_sv = locals->at(2); // Class<?> caller
1239 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1240 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1241 privileged_context = ctx_sv->get_obj();
1242 Handle caller = clr_sv->get_obj();
1243
1244 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1245 protection_domain = caller_klass->protection_domain();
1246 } else {
1247 protection_domain = method->method_holder()->protection_domain();
1248 }
1249
1250 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) {
1251 local_array->push(protection_domain);
1252 previous_protection_domain = protection_domain;
1253 }
1254
1255 if (is_privileged) break;
1256 }
1257
1258
1259 // either all the domains on the stack were system domains, or
1260 // we had a privileged system domain
1261 if (local_array->is_empty()) {
1262 if (is_privileged && privileged_context.is_null()) return NULL;
1263
1264 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1265 return JNIHandles::make_local(env, result);
1266 }
1267
1268 // the resource area must be registered in case of a gc
1269 RegisterArrayForGC ragc(thread, local_array);
1270 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1271 local_array->length(), CHECK_NULL);
1272 objArrayHandle h_context(thread, context);
1273 for (int index = 0; index < local_array->length(); index++) {
1274 h_context->obj_at_put(index, local_array->at(index));
1275 }
1276
1277 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1278
1279 return JNIHandles::make_local(env, result);
1280 JVM_END
1281
1282
1283 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1284 JVMWrapper("JVM_IsArrayClass");
1285 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1286 return (k != NULL) && k->is_array_klass() ? true : false;
1287 JVM_END
1288
1289
1290 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1291 JVMWrapper("JVM_IsPrimitiveClass");
1292 oop mirror = JNIHandles::resolve_non_null(cls);
1293 return (jboolean) java_lang_Class::is_primitive(mirror);
1294 JVM_END
1295
1296
1297 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1298 JVMWrapper("JVM_GetClassModifiers");
1299 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1300 // Primitive type
1301 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1302 }
1303
1304 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1305 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1306 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1307 return k->modifier_flags();
1308 JVM_END
1309
1310
1311 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1312
1313 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1314 JvmtiVMObjectAllocEventCollector oam;
1315 // ofClass is a reference to a java_lang_Class object. The mirror object
1316 // of an InstanceKlass
1317
1318 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1319 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1320 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1321 return (jobjectArray)JNIHandles::make_local(env, result);
1322 }
1323
1324 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1325 InnerClassesIterator iter(k);
1326
1327 if (iter.length() == 0) {
1328 // Neither an inner nor outer class
1329 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1330 return (jobjectArray)JNIHandles::make_local(env, result);
1331 }
1332
1333 // find inner class info
1334 constantPoolHandle cp(thread, k->constants());
1335 int length = iter.length();
1336
1337 // Allocate temp. result array
1338 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1339 objArrayHandle result (THREAD, r);
1340 int members = 0;
1341
1342 for (; !iter.done(); iter.next()) {
1343 int ioff = iter.inner_class_info_index();
1344 int ooff = iter.outer_class_info_index();
1345
1346 if (ioff != 0 && ooff != 0) {
1347 // Check to see if the name matches the class we're looking for
1348 // before attempting to find the class.
1349 if (cp->klass_name_at_matches(k, ooff)) {
1350 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1351 if (outer_klass == k) {
1352 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1353 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1354
1355 // Throws an exception if outer klass has not declared k as
1356 // an inner klass
1357 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1358
1359 result->obj_at_put(members, inner_klass->java_mirror());
1360 members++;
1361 }
1362 }
1363 }
1364 }
1365
1366 if (members != length) {
1367 // Return array of right length
1368 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1369 for(int i = 0; i < members; i++) {
1370 res->obj_at_put(i, result->obj_at(i));
1371 }
1372 return (jobjectArray)JNIHandles::make_local(env, res);
1373 }
1374
1375 return (jobjectArray)JNIHandles::make_local(env, result());
1376 JVM_END
1377
1378
1379 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1380 {
1381 // ofClass is a reference to a java_lang_Class object.
1382 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1383 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1384 return NULL;
1385 }
1386
1387 bool inner_is_member = false;
1388 Klass* outer_klass
1389 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1390 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1391 if (outer_klass == NULL) return NULL; // already a top-level class
1392 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1393 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1394 }
1395 JVM_END
1396
1397 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1398 {
1399 oop mirror = JNIHandles::resolve_non_null(cls);
1400 if (java_lang_Class::is_primitive(mirror) ||
1401 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1402 return NULL;
1403 }
1404 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1405 int ooff = 0, noff = 0;
1406 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1407 if (noff != 0) {
1408 constantPoolHandle i_cp(thread, k->constants());
1409 Symbol* name = i_cp->symbol_at(noff);
1410 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1411 return (jstring) JNIHandles::make_local(env, str());
1412 }
1413 }
1414 return NULL;
1415 }
1416 JVM_END
1417
1418 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1419 assert (cls != NULL, "illegal class");
1420 JVMWrapper("JVM_GetClassSignature");
1421 JvmtiVMObjectAllocEventCollector oam;
1422 ResourceMark rm(THREAD);
1423 // Return null for arrays and primatives
1424 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1425 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1426 if (k->is_instance_klass()) {
1427 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1428 if (sym == NULL) return NULL;
1429 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1430 return (jstring) JNIHandles::make_local(env, str());
1431 }
1432 }
1433 return NULL;
1434 JVM_END
1435
1436
1437 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1438 assert (cls != NULL, "illegal class");
1439 JVMWrapper("JVM_GetClassAnnotations");
1440
1441 // Return null for arrays and primitives
1442 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1443 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1444 if (k->is_instance_klass()) {
1445 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1446 return (jbyteArray) JNIHandles::make_local(env, a);
1447 }
1448 }
1449 return NULL;
1450 JVM_END
1451
1452
1453 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1454 // some of this code was adapted from from jni_FromReflectedField
1455
1456 oop reflected = JNIHandles::resolve_non_null(field);
1457 oop mirror = java_lang_reflect_Field::clazz(reflected);
1458 Klass* k = java_lang_Class::as_Klass(mirror);
1459 int slot = java_lang_reflect_Field::slot(reflected);
1460 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1461
1462 InstanceKlass* ik = InstanceKlass::cast(k);
1463 intptr_t offset = ik->field_offset(slot);
1464
1465 if (modifiers & JVM_ACC_STATIC) {
1466 // for static fields we only look in the current class
1467 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1468 assert(false, "cannot find static field");
1469 return false;
1470 }
1471 } else {
1472 // for instance fields we start with the current class and work
1473 // our way up through the superclass chain
1474 if (!ik->find_field_from_offset(offset, false, &fd)) {
1475 assert(false, "cannot find instance field");
1476 return false;
1477 }
1478 }
1479 return true;
1480 }
1481
1482 static Method* jvm_get_method_common(jobject method) {
1483 // some of this code was adapted from from jni_FromReflectedMethod
1484
1485 oop reflected = JNIHandles::resolve_non_null(method);
1486 oop mirror = NULL;
1487 int slot = 0;
1488
1489 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1490 mirror = java_lang_reflect_Constructor::clazz(reflected);
1491 slot = java_lang_reflect_Constructor::slot(reflected);
1492 } else {
1493 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1494 "wrong type");
1495 mirror = java_lang_reflect_Method::clazz(reflected);
1496 slot = java_lang_reflect_Method::slot(reflected);
1497 }
1498 Klass* k = java_lang_Class::as_Klass(mirror);
1499
1500 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1501 assert(m != NULL, "cannot find method");
1502 return m; // caller has to deal with NULL in product mode
1503 }
1504
1505 /* Type use annotations support (JDK 1.8) */
1506
1507 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1508 assert (cls != NULL, "illegal class");
1509 JVMWrapper("JVM_GetClassTypeAnnotations");
1510 ResourceMark rm(THREAD);
1511 // Return null for arrays and primitives
1512 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1513 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1514 if (k->is_instance_klass()) {
1515 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1516 if (type_annotations != NULL) {
1517 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1518 return (jbyteArray) JNIHandles::make_local(env, a);
1519 }
1520 }
1521 }
1522 return NULL;
1523 JVM_END
1524
1525 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1526 assert (method != NULL, "illegal method");
1527 JVMWrapper("JVM_GetMethodTypeAnnotations");
1528
1529 // method is a handle to a java.lang.reflect.Method object
1530 Method* m = jvm_get_method_common(method);
1531 if (m == NULL) {
1532 return NULL;
1533 }
1534
1535 AnnotationArray* type_annotations = m->type_annotations();
1536 if (type_annotations != NULL) {
1537 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1538 return (jbyteArray) JNIHandles::make_local(env, a);
1539 }
1540
1541 return NULL;
1542 JVM_END
1543
1544 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1545 assert (field != NULL, "illegal field");
1546 JVMWrapper("JVM_GetFieldTypeAnnotations");
1547
1548 fieldDescriptor fd;
1549 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1550 if (!gotFd) {
1551 return NULL;
1552 }
1553
1554 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1555 JVM_END
1556
1557 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1558 if (!cp->is_within_bounds(index)) {
1559 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1560 }
1561 }
1562
1563 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1564 {
1565 JVMWrapper("JVM_GetMethodParameters");
1566 // method is a handle to a java.lang.reflect.Method object
1567 Method* method_ptr = jvm_get_method_common(method);
1568 methodHandle mh (THREAD, method_ptr);
1569 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1570 const int num_params = mh->method_parameters_length();
1571
1572 if (num_params < 0) {
1573 // A -1 return value from method_parameters_length means there is no
1574 // parameter data. Return null to indicate this to the reflection
1575 // API.
1576 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1577 return (jobjectArray)NULL;
1578 } else {
1579 // Otherwise, we return something up to reflection, even if it is
1580 // a zero-length array. Why? Because in some cases this can
1581 // trigger a MalformedParametersException.
1582
1583 // make sure all the symbols are properly formatted
1584 for (int i = 0; i < num_params; i++) {
1585 MethodParametersElement* params = mh->method_parameters_start();
1586 int index = params[i].name_cp_index;
1587 bounds_check(mh->constants(), index, CHECK_NULL);
1588
1589 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1590 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1591 "Wrong type at constant pool index");
1592 }
1593
1594 }
1595
1596 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1597 objArrayHandle result (THREAD, result_oop);
1598
1599 for (int i = 0; i < num_params; i++) {
1600 MethodParametersElement* params = mh->method_parameters_start();
1601 // For a 0 index, give a NULL symbol
1602 Symbol* sym = 0 != params[i].name_cp_index ?
1603 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1604 int flags = params[i].flags;
1605 oop param = Reflection::new_parameter(reflected_method, i, sym,
1606 flags, CHECK_NULL);
1607 result->obj_at_put(i, param);
1608 }
1609 return (jobjectArray)JNIHandles::make_local(env, result());
1610 }
1611 }
1612 JVM_END
1613
1614 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1615
1616 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1617 {
1618 JVMWrapper("JVM_GetClassDeclaredFields");
1619 JvmtiVMObjectAllocEventCollector oam;
1620
1621 // Exclude primitive types and array types
1622 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1623 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1624 // Return empty array
1625 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1626 return (jobjectArray) JNIHandles::make_local(env, res);
1627 }
1628
1629 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1630 constantPoolHandle cp(THREAD, k->constants());
1631
1632 // Ensure class is linked
1633 k->link_class(CHECK_NULL);
1634
1635 // Allocate result
1636 int num_fields;
1637
1638 if (publicOnly) {
1639 num_fields = 0;
1640 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1641 if (fs.access_flags().is_public()) ++num_fields;
1642 }
1643 } else {
1644 num_fields = k->java_fields_count();
1645 }
1646
1647 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1648 objArrayHandle result (THREAD, r);
1649
1650 int out_idx = 0;
1651 fieldDescriptor fd;
1652 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1653 if (!publicOnly || fs.access_flags().is_public()) {
1654 fd.reinitialize(k, fs.index());
1655 oop field = Reflection::new_field(&fd, CHECK_NULL);
1656 result->obj_at_put(out_idx, field);
1657 ++out_idx;
1658 }
1659 }
1660 assert(out_idx == num_fields, "just checking");
1661 return (jobjectArray) JNIHandles::make_local(env, result());
1662 }
1663 JVM_END
1664
1665 static bool select_method(const methodHandle& method, bool want_constructor) {
1666 bool is_ctor = (method->is_object_constructor() ||
1667 method->is_static_init_factory());
1668 if (want_constructor) {
1669 return is_ctor;
1670 } else {
1671 return (!is_ctor &&
1672 !method->is_class_initializer() &&
1673 !method->is_overpass());
1674 }
1675 }
1676
1677 static jobjectArray get_class_declared_methods_helper(
1678 JNIEnv *env,
1679 jclass ofClass, jboolean publicOnly,
1680 bool want_constructor,
1681 Klass* klass, TRAPS) {
1682
1683 JvmtiVMObjectAllocEventCollector oam;
1684
1685 // Exclude primitive types and array types
1686 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1687 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1688 // Return empty array
1689 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1690 return (jobjectArray) JNIHandles::make_local(env, res);
1691 }
1692
1693 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1694
1695 // Ensure class is linked
1696 k->link_class(CHECK_NULL);
1697
1698 Array<Method*>* methods = k->methods();
1699 int methods_length = methods->length();
1700
1701 // Save original method_idnum in case of redefinition, which can change
1702 // the idnum of obsolete methods. The new method will have the same idnum
1703 // but if we refresh the methods array, the counts will be wrong.
1704 ResourceMark rm(THREAD);
1705 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1706 int num_methods = 0;
1707
1708 for (int i = 0; i < methods_length; i++) {
1709 methodHandle method(THREAD, methods->at(i));
1710 if (select_method(method, want_constructor)) {
1711 if (!publicOnly || method->is_public()) {
1712 idnums->push(method->method_idnum());
1713 ++num_methods;
1714 }
1715 }
1716 }
1717
1718 // Allocate result
1719 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1720 objArrayHandle result (THREAD, r);
1721
1722 // Now just put the methods that we selected above, but go by their idnum
1723 // in case of redefinition. The methods can be redefined at any safepoint,
1724 // so above when allocating the oop array and below when creating reflect
1725 // objects.
1726 for (int i = 0; i < num_methods; i++) {
1727 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1728 if (method.is_null()) {
1729 // Method may have been deleted and seems this API can handle null
1730 // Otherwise should probably put a method that throws NSME
1731 result->obj_at_put(i, NULL);
1732 } else {
1733 oop m;
1734 if (want_constructor) {
1735 assert(method->is_object_constructor() ||
1736 method->is_static_init_factory(), "must be");
1737 m = Reflection::new_constructor(method, CHECK_NULL);
1738 } else {
1739 m = Reflection::new_method(method, false, CHECK_NULL);
1740 }
1741 result->obj_at_put(i, m);
1742 }
1743 }
1744
1745 return (jobjectArray) JNIHandles::make_local(env, result());
1746 }
1747
1748 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1749 {
1750 JVMWrapper("JVM_GetClassDeclaredMethods");
1751 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1752 /*want_constructor*/ false,
1753 SystemDictionary::reflect_Method_klass(), THREAD);
1754 }
1755 JVM_END
1756
1757 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1758 {
1759 JVMWrapper("JVM_GetClassDeclaredConstructors");
1760 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1761 /*want_constructor*/ true,
1762 SystemDictionary::reflect_Constructor_klass(), THREAD);
1763 }
1764 JVM_END
1765
1766 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1767 {
1768 JVMWrapper("JVM_GetClassAccessFlags");
1769 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1770 // Primitive type
1771 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1772 }
1773
1774 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1775 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1776 }
1777 JVM_END
1778
1779 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1780 {
1781 JVMWrapper("JVM_AreNestMates");
1782 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1783 assert(c->is_instance_klass(), "must be");
1784 InstanceKlass* ck = InstanceKlass::cast(c);
1785 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1786 assert(m->is_instance_klass(), "must be");
1787 InstanceKlass* mk = InstanceKlass::cast(m);
1788 return ck->has_nestmate_access_to(mk, THREAD);
1789 }
1790 JVM_END
1791
1792 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1793 {
1794 // current is not a primitive or array class
1795 JVMWrapper("JVM_GetNestHost");
1796 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1797 assert(c->is_instance_klass(), "must be");
1798 InstanceKlass* ck = InstanceKlass::cast(c);
1799 // Don't post exceptions if validation fails
1800 InstanceKlass* host = ck->nest_host(NULL, THREAD);
1801 return (jclass) (host == NULL ? NULL :
1802 JNIHandles::make_local(THREAD, host->java_mirror()));
1803 }
1804 JVM_END
1805
1806 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1807 {
1808 // current is not a primitive or array class
1809 JVMWrapper("JVM_GetNestMembers");
1810 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1811 assert(c->is_instance_klass(), "must be");
1812 InstanceKlass* ck = InstanceKlass::cast(c);
1813 // Get the nest host for this nest - throw ICCE if validation fails
1814 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
1815 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
1816
1817 {
1818 JvmtiVMObjectAllocEventCollector oam;
1819 Array<u2>* members = host->nest_members();
1820 int length = members == NULL ? 0 : members->length();
1821 // nest host is first in the array so make it one bigger
1822 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
1823 length + 1, CHECK_NULL);
1824 objArrayHandle result (THREAD, r);
1825 result->obj_at_put(0, host->java_mirror());
1826 if (length != 0) {
1827 int i;
1828 for (i = 0; i < length; i++) {
1829 int cp_index = members->at(i);
1830 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
1831 if (k->is_instance_klass()) {
1832 InstanceKlass* nest_host_k =
1833 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
1834 if (nest_host_k == host) {
1835 result->obj_at_put(i+1, k->java_mirror());
1836 }
1837 else {
1838 // k's nest host is legal but it isn't our host so
1839 // throw ICCE
1840 ResourceMark rm(THREAD);
1841 Exceptions::fthrow(THREAD_AND_LOCATION,
1842 icce,
1843 "Nest member %s in %s declares a different nest host of %s",
1844 k->external_name(),
1845 host->external_name(),
1846 nest_host_k->external_name()
1847 );
1848 return NULL;
1849 }
1850 }
1851 else {
1852 // we have a bad nest member entry - throw ICCE
1853 ResourceMark rm(THREAD);
1854 Exceptions::fthrow(THREAD_AND_LOCATION,
1855 icce,
1856 "Class %s can not be a nest member of %s",
1857 k->external_name(),
1858 host->external_name()
1859 );
1860 return NULL;
1861 }
1862 }
1863 }
1864 else {
1865 assert(host == ck, "must be singleton nest");
1866 }
1867 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1868 }
1869 }
1870 JVM_END
1871
1872 // Constant pool access //////////////////////////////////////////////////////////
1873
1874 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1875 {
1876 JVMWrapper("JVM_GetClassConstantPool");
1877 JvmtiVMObjectAllocEventCollector oam;
1878
1879 // Return null for primitives and arrays
1880 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1881 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1882 if (k->is_instance_klass()) {
1883 InstanceKlass* k_h = InstanceKlass::cast(k);
1884 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1885 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1886 return JNIHandles::make_local(jcp());
1887 }
1888 }
1889 return NULL;
1890 }
1891 JVM_END
1892
1893
1894 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1895 {
1896 JVMWrapper("JVM_ConstantPoolGetSize");
1897 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1898 return cp->length();
1899 }
1900 JVM_END
1901
1902
1903 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1904 {
1905 JVMWrapper("JVM_ConstantPoolGetClassAt");
1906 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1907 bounds_check(cp, index, CHECK_NULL);
1908 constantTag tag = cp->tag_at(index);
1909 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1910 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1911 }
1912 Klass* k = cp->klass_at(index, CHECK_NULL);
1913 return (jclass) JNIHandles::make_local(k->java_mirror());
1914 }
1915 JVM_END
1916
1917 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1918 {
1919 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1920 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1921 bounds_check(cp, index, CHECK_NULL);
1922 constantTag tag = cp->tag_at(index);
1923 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1924 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1925 }
1926 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1927 if (k == NULL) return NULL;
1928 return (jclass) JNIHandles::make_local(k->java_mirror());
1929 }
1930 JVM_END
1931
1932 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1933 constantTag tag = cp->tag_at(index);
1934 if (!tag.is_method() && !tag.is_interface_method()) {
1935 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1936 }
1937 int klass_ref = cp->uncached_klass_ref_index_at(index);
1938 Klass* k_o;
1939 if (force_resolution) {
1940 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1941 } else {
1942 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1943 if (k_o == NULL) return NULL;
1944 }
1945 InstanceKlass* k = InstanceKlass::cast(k_o);
1946 Symbol* name = cp->uncached_name_ref_at(index);
1947 Symbol* sig = cp->uncached_signature_ref_at(index);
1948 methodHandle m (THREAD, k->find_method(name, sig));
1949 if (m.is_null()) {
1950 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1951 }
1952 oop method;
1953 if (m->is_object_constructor()) {
1954 method = Reflection::new_constructor(m, CHECK_NULL);
1955 } else {
1956 method = Reflection::new_method(m, true, CHECK_NULL);
1957 }
1958 return JNIHandles::make_local(method);
1959 }
1960
1961 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1962 {
1963 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1964 JvmtiVMObjectAllocEventCollector oam;
1965 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1966 bounds_check(cp, index, CHECK_NULL);
1967 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1968 return res;
1969 }
1970 JVM_END
1971
1972 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1973 {
1974 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1975 JvmtiVMObjectAllocEventCollector oam;
1976 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1977 bounds_check(cp, index, CHECK_NULL);
1978 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1979 return res;
1980 }
1981 JVM_END
1982
1983 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1984 constantTag tag = cp->tag_at(index);
1985 if (!tag.is_field()) {
1986 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1987 }
1988 int klass_ref = cp->uncached_klass_ref_index_at(index);
1989 Klass* k_o;
1990 if (force_resolution) {
1991 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1992 } else {
1993 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1994 if (k_o == NULL) return NULL;
1995 }
1996 InstanceKlass* k = InstanceKlass::cast(k_o);
1997 Symbol* name = cp->uncached_name_ref_at(index);
1998 Symbol* sig = cp->uncached_signature_ref_at(index);
1999 fieldDescriptor fd;
2000 Klass* target_klass = k->find_field(name, sig, &fd);
2001 if (target_klass == NULL) {
2002 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2003 }
2004 oop field = Reflection::new_field(&fd, CHECK_NULL);
2005 return JNIHandles::make_local(field);
2006 }
2007
2008 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2009 {
2010 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2011 JvmtiVMObjectAllocEventCollector oam;
2012 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2013 bounds_check(cp, index, CHECK_NULL);
2014 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2015 return res;
2016 }
2017 JVM_END
2018
2019 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2020 {
2021 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2022 JvmtiVMObjectAllocEventCollector oam;
2023 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2024 bounds_check(cp, index, CHECK_NULL);
2025 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2026 return res;
2027 }
2028 JVM_END
2029
2030 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2031 {
2032 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2033 JvmtiVMObjectAllocEventCollector oam;
2034 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2035 bounds_check(cp, index, CHECK_NULL);
2036 constantTag tag = cp->tag_at(index);
2037 if (!tag.is_field_or_method()) {
2038 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2039 }
2040 int klass_ref = cp->uncached_klass_ref_index_at(index);
2041 Symbol* klass_name = cp->klass_name_at(klass_ref);
2042 Symbol* member_name = cp->uncached_name_ref_at(index);
2043 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2044 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2045 objArrayHandle dest(THREAD, dest_o);
2046 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2047 dest->obj_at_put(0, str());
2048 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2049 dest->obj_at_put(1, str());
2050 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2051 dest->obj_at_put(2, str());
2052 return (jobjectArray) JNIHandles::make_local(dest());
2053 }
2054 JVM_END
2055
2056 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2057 {
2058 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2059 JvmtiVMObjectAllocEventCollector oam;
2060 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2061 bounds_check(cp, index, CHECK_0);
2062 constantTag tag = cp->tag_at(index);
2063 if (!tag.is_field_or_method()) {
2064 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2065 }
2066 return (jint) cp->uncached_klass_ref_index_at(index);
2067 }
2068 JVM_END
2069
2070 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2071 {
2072 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2073 JvmtiVMObjectAllocEventCollector oam;
2074 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2075 bounds_check(cp, index, CHECK_0);
2076 constantTag tag = cp->tag_at(index);
2077 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2078 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2079 }
2080 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2081 }
2082 JVM_END
2083
2084 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2085 {
2086 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2087 JvmtiVMObjectAllocEventCollector oam;
2088 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2089 bounds_check(cp, index, CHECK_NULL);
2090 constantTag tag = cp->tag_at(index);
2091 if (!tag.is_name_and_type()) {
2092 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2093 }
2094 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2095 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2096 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2097 objArrayHandle dest(THREAD, dest_o);
2098 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2099 dest->obj_at_put(0, str());
2100 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2101 dest->obj_at_put(1, str());
2102 return (jobjectArray) JNIHandles::make_local(dest());
2103 }
2104 JVM_END
2105
2106 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2107 {
2108 JVMWrapper("JVM_ConstantPoolGetIntAt");
2109 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2110 bounds_check(cp, index, CHECK_0);
2111 constantTag tag = cp->tag_at(index);
2112 if (!tag.is_int()) {
2113 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2114 }
2115 return cp->int_at(index);
2116 }
2117 JVM_END
2118
2119 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2120 {
2121 JVMWrapper("JVM_ConstantPoolGetLongAt");
2122 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2123 bounds_check(cp, index, CHECK_(0L));
2124 constantTag tag = cp->tag_at(index);
2125 if (!tag.is_long()) {
2126 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2127 }
2128 return cp->long_at(index);
2129 }
2130 JVM_END
2131
2132 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2133 {
2134 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2135 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2136 bounds_check(cp, index, CHECK_(0.0f));
2137 constantTag tag = cp->tag_at(index);
2138 if (!tag.is_float()) {
2139 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2140 }
2141 return cp->float_at(index);
2142 }
2143 JVM_END
2144
2145 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2146 {
2147 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2148 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2149 bounds_check(cp, index, CHECK_(0.0));
2150 constantTag tag = cp->tag_at(index);
2151 if (!tag.is_double()) {
2152 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2153 }
2154 return cp->double_at(index);
2155 }
2156 JVM_END
2157
2158 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2159 {
2160 JVMWrapper("JVM_ConstantPoolGetStringAt");
2161 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2162 bounds_check(cp, index, CHECK_NULL);
2163 constantTag tag = cp->tag_at(index);
2164 if (!tag.is_string()) {
2165 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2166 }
2167 oop str = cp->string_at(index, CHECK_NULL);
2168 return (jstring) JNIHandles::make_local(str);
2169 }
2170 JVM_END
2171
2172 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2173 {
2174 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2175 JvmtiVMObjectAllocEventCollector oam;
2176 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2177 bounds_check(cp, index, CHECK_NULL);
2178 constantTag tag = cp->tag_at(index);
2179 if (!tag.is_symbol()) {
2180 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2181 }
2182 Symbol* sym = cp->symbol_at(index);
2183 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2184 return (jstring) JNIHandles::make_local(str());
2185 }
2186 JVM_END
2187
2188 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2189 {
2190 JVMWrapper("JVM_ConstantPoolGetTagAt");
2191 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2192 bounds_check(cp, index, CHECK_0);
2193 constantTag tag = cp->tag_at(index);
2194 jbyte result = tag.value();
2195 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2196 // they are changed to the corresponding tags from the JVM spec, so that java code in
2197 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2198 if (tag.is_klass_or_reference()) {
2199 result = JVM_CONSTANT_Class;
2200 } else if (tag.is_string_index()) {
2201 result = JVM_CONSTANT_String;
2202 } else if (tag.is_method_type_in_error()) {
2203 result = JVM_CONSTANT_MethodType;
2204 } else if (tag.is_method_handle_in_error()) {
2205 result = JVM_CONSTANT_MethodHandle;
2206 } else if (tag.is_dynamic_constant_in_error()) {
2207 result = JVM_CONSTANT_Dynamic;
2208 }
2209 return result;
2210 }
2211 JVM_END
2212
2213 // Assertion support. //////////////////////////////////////////////////////////
2214
2215 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2216 JVMWrapper("JVM_DesiredAssertionStatus");
2217 assert(cls != NULL, "bad class");
2218
2219 oop r = JNIHandles::resolve(cls);
2220 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2221 if (java_lang_Class::is_primitive(r)) return false;
2222
2223 Klass* k = java_lang_Class::as_Klass(r);
2224 assert(k->is_instance_klass(), "must be an instance klass");
2225 if (!k->is_instance_klass()) return false;
2226
2227 ResourceMark rm(THREAD);
2228 const char* name = k->name()->as_C_string();
2229 bool system_class = k->class_loader() == NULL;
2230 return JavaAssertions::enabled(name, system_class);
2231
2232 JVM_END
2233
2234
2235 // Return a new AssertionStatusDirectives object with the fields filled in with
2236 // command-line assertion arguments (i.e., -ea, -da).
2237 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2238 JVMWrapper("JVM_AssertionStatusDirectives");
2239 JvmtiVMObjectAllocEventCollector oam;
2240 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2241 return JNIHandles::make_local(env, asd);
2242 JVM_END
2243
2244 // Arrays support /////////////////////////////////////////////////////////////
2245
2246 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2247 JVMWrapper("JVM_ArrayIsAccessAtomic");
2248 oop o = JNIHandles::resolve(array);
2249 Klass* k = o->klass();
2250 if ((o == NULL) || (!k->is_array_klass())) {
2251 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2252 }
2253 if (k->is_valueArray_klass()) {
2254 return ValueArrayKlass::cast(k)->is_atomic();
2255 }
2256 return true;
2257 JVM_END
2258
2259 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2260 JVMWrapper("JVM_ArrayEnsureAccessAtomic");
2261 oop o = JNIHandles::resolve(array);
2262 Klass* k = o->klass();
2263 if ((o == NULL) || (!k->is_array_klass())) {
2264 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2265 }
2266 if (k->is_valueArray_klass()) {
2267 ValueArrayKlass* vk = ValueArrayKlass::cast(k);
2268 if (!vk->is_atomic()) {
2269 /**
2270 * Need to decide how to implement:
2271 *
2272 * 1) Change to objArrayOop layout, therefore oop->klass() differs so
2273 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through
2274 * "checkcast" & "instanceof"
2275 *
2276 * 2) Use extra header in the valueArrayOop to flag atomicity required and
2277 * possibly per instance lock structure. Said info, could be placed in
2278 * "trailer" rather than disturb the current arrayOop
2279 */
2280 Unimplemented();
2281 }
2282 }
2283 return array;
2284 JVM_END
2285
2286 // Verification ////////////////////////////////////////////////////////////////////////////////
2287
2288 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2289
2290 // RedefineClasses support: bug 6214132 caused verification to fail.
2291 // All functions from this section should call the jvmtiThreadSate function:
2292 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2293 // The function returns a Klass* of the _scratch_class if the verifier
2294 // was invoked in the middle of the class redefinition.
2295 // Otherwise it returns its argument value which is the _the_class Klass*.
2296 // Please, refer to the description in the jvmtiThreadSate.hpp.
2297
2298 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2299 JVMWrapper("JVM_GetClassNameUTF");
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->name()->as_utf8();
2303 JVM_END
2304
2305
2306 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2307 JVMWrapper("JVM_GetClassCPTypes");
2308 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2309 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2310 // types will have length zero if this is not an InstanceKlass
2311 // (length is determined by call to JVM_GetClassCPEntriesCount)
2312 if (k->is_instance_klass()) {
2313 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2314 for (int index = cp->length() - 1; index >= 0; index--) {
2315 constantTag tag = cp->tag_at(index);
2316 types[index] = tag.is_unresolved_klass() ? JVM_CONSTANT_Class : tag.value();
2317 }
2318 }
2319 JVM_END
2320
2321
2322 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2323 JVMWrapper("JVM_GetClassCPEntriesCount");
2324 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2325 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2326 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2327 JVM_END
2328
2329
2330 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2331 JVMWrapper("JVM_GetClassFieldsCount");
2332 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2333 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2334 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2335 JVM_END
2336
2337
2338 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2339 JVMWrapper("JVM_GetClassMethodsCount");
2340 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2341 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2342 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2343 JVM_END
2344
2345
2346 // The following methods, used for the verifier, are never called with
2347 // array klasses, so a direct cast to InstanceKlass is safe.
2348 // Typically, these methods are called in a loop with bounds determined
2349 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2350 // zero for arrays.
2351 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2352 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
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 int length = method->checked_exceptions_length();
2357 if (length > 0) {
2358 CheckedExceptionElement* table= method->checked_exceptions_start();
2359 for (int i = 0; i < length; i++) {
2360 exceptions[i] = table[i].class_cp_index;
2361 }
2362 }
2363 JVM_END
2364
2365
2366 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2367 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2368 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2369 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2370 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2371 return method->checked_exceptions_length();
2372 JVM_END
2373
2374
2375 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2376 JVMWrapper("JVM_GetMethodIxByteCode");
2377 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2378 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2379 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2380 memcpy(code, method->code_base(), method->code_size());
2381 JVM_END
2382
2383
2384 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2385 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2386 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2387 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2388 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2389 return method->code_size();
2390 JVM_END
2391
2392
2393 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2394 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2395 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2396 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2397 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2398 ExceptionTable extable(method);
2399 entry->start_pc = extable.start_pc(entry_index);
2400 entry->end_pc = extable.end_pc(entry_index);
2401 entry->handler_pc = extable.handler_pc(entry_index);
2402 entry->catchType = extable.catch_type_index(entry_index);
2403 JVM_END
2404
2405
2406 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2407 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2408 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2409 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2410 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2411 return method->exception_table_length();
2412 JVM_END
2413
2414
2415 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2416 JVMWrapper("JVM_GetMethodIxModifiers");
2417 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2418 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2419 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2420 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2421 JVM_END
2422
2423
2424 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2425 JVMWrapper("JVM_GetFieldIxModifiers");
2426 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2427 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2428 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2429 JVM_END
2430
2431
2432 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2433 JVMWrapper("JVM_GetMethodIxLocalsCount");
2434 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2435 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2436 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2437 return method->max_locals();
2438 JVM_END
2439
2440
2441 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2442 JVMWrapper("JVM_GetMethodIxArgsSize");
2443 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2444 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2445 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2446 return method->size_of_parameters();
2447 JVM_END
2448
2449
2450 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2451 JVMWrapper("JVM_GetMethodIxMaxStack");
2452 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2453 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2454 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2455 return method->verifier_max_stack();
2456 JVM_END
2457
2458
2459 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2460 JVMWrapper("JVM_IsConstructorIx");
2461 ResourceMark rm(THREAD);
2462 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2463 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2464 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2465 return method->is_object_constructor();
2466 JVM_END
2467
2468
2469 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2470 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2471 ResourceMark rm(THREAD);
2472 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2473 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2474 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2475 return method->is_overpass();
2476 JVM_END
2477
2478 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2479 JVMWrapper("JVM_GetMethodIxIxUTF");
2480 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2481 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2482 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2483 return method->name()->as_utf8();
2484 JVM_END
2485
2486
2487 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2488 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2489 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2490 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2491 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2492 return method->signature()->as_utf8();
2493 JVM_END
2494
2495 /**
2496 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2497 * read entries in the constant pool. Since the old verifier always
2498 * works on a copy of the code, it will not see any rewriting that
2499 * may possibly occur in the middle of verification. So it is important
2500 * that nothing it calls tries to use the cpCache instead of the raw
2501 * constant pool, so we must use cp->uncached_x methods when appropriate.
2502 */
2503 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2504 JVMWrapper("JVM_GetCPFieldNameUTF");
2505 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2506 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2507 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2508 switch (cp->tag_at(cp_index).value()) {
2509 case JVM_CONSTANT_Fieldref:
2510 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2511 default:
2512 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2513 }
2514 ShouldNotReachHere();
2515 return NULL;
2516 JVM_END
2517
2518
2519 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2520 JVMWrapper("JVM_GetCPMethodNameUTF");
2521 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2522 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2523 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2524 switch (cp->tag_at(cp_index).value()) {
2525 case JVM_CONSTANT_InterfaceMethodref:
2526 case JVM_CONSTANT_Methodref:
2527 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2528 default:
2529 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2530 }
2531 ShouldNotReachHere();
2532 return NULL;
2533 JVM_END
2534
2535
2536 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2537 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2538 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2539 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2540 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2541 switch (cp->tag_at(cp_index).value()) {
2542 case JVM_CONSTANT_InterfaceMethodref:
2543 case JVM_CONSTANT_Methodref:
2544 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2545 default:
2546 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2547 }
2548 ShouldNotReachHere();
2549 return NULL;
2550 JVM_END
2551
2552
2553 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2554 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2555 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2556 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2557 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2558 switch (cp->tag_at(cp_index).value()) {
2559 case JVM_CONSTANT_Fieldref:
2560 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2561 default:
2562 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2563 }
2564 ShouldNotReachHere();
2565 return NULL;
2566 JVM_END
2567
2568
2569 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2570 JVMWrapper("JVM_GetCPClassNameUTF");
2571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2572 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2573 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2574 Symbol* classname = cp->klass_name_at(cp_index);
2575 return classname->as_utf8();
2576 JVM_END
2577
2578
2579 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2580 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2581 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2582 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2583 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2584 switch (cp->tag_at(cp_index).value()) {
2585 case JVM_CONSTANT_Fieldref: {
2586 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2587 Symbol* classname = cp->klass_name_at(class_index);
2588 return classname->as_utf8();
2589 }
2590 default:
2591 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2592 }
2593 ShouldNotReachHere();
2594 return NULL;
2595 JVM_END
2596
2597
2598 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2599 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2600 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2601 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2602 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2603 switch (cp->tag_at(cp_index).value()) {
2604 case JVM_CONSTANT_Methodref:
2605 case JVM_CONSTANT_InterfaceMethodref: {
2606 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2607 Symbol* classname = cp->klass_name_at(class_index);
2608 return classname->as_utf8();
2609 }
2610 default:
2611 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2612 }
2613 ShouldNotReachHere();
2614 return NULL;
2615 JVM_END
2616
2617
2618 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2619 JVMWrapper("JVM_GetCPFieldModifiers");
2620 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2621 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2622 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2623 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2624 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2625 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2626 switch (cp->tag_at(cp_index).value()) {
2627 case JVM_CONSTANT_Fieldref: {
2628 Symbol* name = cp->uncached_name_ref_at(cp_index);
2629 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2630 InstanceKlass* ik = InstanceKlass::cast(k_called);
2631 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2632 if (fs.name() == name && fs.signature() == signature) {
2633 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2634 }
2635 }
2636 return -1;
2637 }
2638 default:
2639 fatal("JVM_GetCPFieldModifiers: illegal constant");
2640 }
2641 ShouldNotReachHere();
2642 return 0;
2643 JVM_END
2644
2645
2646 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2647 JVMWrapper("JVM_GetCPMethodModifiers");
2648 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2649 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2650 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2651 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2652 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2653 switch (cp->tag_at(cp_index).value()) {
2654 case JVM_CONSTANT_Methodref:
2655 case JVM_CONSTANT_InterfaceMethodref: {
2656 Symbol* name = cp->uncached_name_ref_at(cp_index);
2657 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2658 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2659 int methods_count = methods->length();
2660 for (int i = 0; i < methods_count; i++) {
2661 Method* method = methods->at(i);
2662 if (method->name() == name && method->signature() == signature) {
2663 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2664 }
2665 }
2666 return -1;
2667 }
2668 default:
2669 fatal("JVM_GetCPMethodModifiers: illegal constant");
2670 }
2671 ShouldNotReachHere();
2672 return 0;
2673 JVM_END
2674
2675
2676 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2677
2678 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2679 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2680 JVM_END
2681
2682
2683 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2684 JVMWrapper("JVM_IsSameClassPackage");
2685 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2686 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2687 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2688 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2689 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2690 JVM_END
2691
2692 // Printing support //////////////////////////////////////////////////
2693 extern "C" {
2694
2695 ATTRIBUTE_PRINTF(3, 0)
2696 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2697 // Reject count values that are negative signed values converted to
2698 // unsigned; see bug 4399518, 4417214
2699 if ((intptr_t)count <= 0) return -1;
2700
2701 int result = os::vsnprintf(str, count, fmt, args);
2702 if (result > 0 && (size_t)result >= count) {
2703 result = -1;
2704 }
2705
2706 return result;
2707 }
2708
2709 ATTRIBUTE_PRINTF(3, 4)
2710 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2711 va_list args;
2712 int len;
2713 va_start(args, fmt);
2714 len = jio_vsnprintf(str, count, fmt, args);
2715 va_end(args);
2716 return len;
2717 }
2718
2719 ATTRIBUTE_PRINTF(2, 3)
2720 int jio_fprintf(FILE* f, const char *fmt, ...) {
2721 int len;
2722 va_list args;
2723 va_start(args, fmt);
2724 len = jio_vfprintf(f, fmt, args);
2725 va_end(args);
2726 return len;
2727 }
2728
2729 ATTRIBUTE_PRINTF(2, 0)
2730 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2731 if (Arguments::vfprintf_hook() != NULL) {
2732 return Arguments::vfprintf_hook()(f, fmt, args);
2733 } else {
2734 return vfprintf(f, fmt, args);
2735 }
2736 }
2737
2738 ATTRIBUTE_PRINTF(1, 2)
2739 JNIEXPORT int jio_printf(const char *fmt, ...) {
2740 int len;
2741 va_list args;
2742 va_start(args, fmt);
2743 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2744 va_end(args);
2745 return len;
2746 }
2747
2748 // HotSpot specific jio method
2749 void jio_print(const char* s, size_t len) {
2750 // Try to make this function as atomic as possible.
2751 if (Arguments::vfprintf_hook() != NULL) {
2752 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2753 } else {
2754 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2755 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2756 }
2757 }
2758
2759 } // Extern C
2760
2761 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2762
2763 // In most of the JVM thread support functions we need to access the
2764 // thread through a ThreadsListHandle to prevent it from exiting and
2765 // being reclaimed while we try to operate on it. The exceptions to this
2766 // rule are when operating on the current thread, or if the monitor of
2767 // the target java.lang.Thread is locked at the Java level - in both
2768 // cases the target cannot exit.
2769
2770 static void thread_entry(JavaThread* thread, TRAPS) {
2771 HandleMark hm(THREAD);
2772 Handle obj(THREAD, thread->threadObj());
2773 JavaValue result(T_VOID);
2774 JavaCalls::call_virtual(&result,
2775 obj,
2776 SystemDictionary::Thread_klass(),
2777 vmSymbols::run_method_name(),
2778 vmSymbols::void_method_signature(),
2779 THREAD);
2780 }
2781
2782
2783 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2784 JVMWrapper("JVM_StartThread");
2785 JavaThread *native_thread = NULL;
2786
2787 // We cannot hold the Threads_lock when we throw an exception,
2788 // due to rank ordering issues. Example: we might need to grab the
2789 // Heap_lock while we construct the exception.
2790 bool throw_illegal_thread_state = false;
2791
2792 // We must release the Threads_lock before we can post a jvmti event
2793 // in Thread::start.
2794 {
2795 // Ensure that the C++ Thread and OSThread structures aren't freed before
2796 // we operate.
2797 MutexLocker mu(Threads_lock);
2798
2799 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2800 // re-starting an already started thread, so we should usually find
2801 // that the JavaThread is null. However for a JNI attached thread
2802 // there is a small window between the Thread object being created
2803 // (with its JavaThread set) and the update to its threadStatus, so we
2804 // have to check for this
2805 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2806 throw_illegal_thread_state = true;
2807 } else {
2808 // We could also check the stillborn flag to see if this thread was already stopped, but
2809 // for historical reasons we let the thread detect that itself when it starts running
2810
2811 jlong size =
2812 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2813 // Allocate the C++ Thread structure and create the native thread. The
2814 // stack size retrieved from java is 64-bit signed, but the constructor takes
2815 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2816 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2817 // - Avoid passing negative values which would result in really large stacks.
2818 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2819 size_t sz = size > 0 ? (size_t) size : 0;
2820 native_thread = new JavaThread(&thread_entry, sz);
2821
2822 // At this point it may be possible that no osthread was created for the
2823 // JavaThread due to lack of memory. Check for this situation and throw
2824 // an exception if necessary. Eventually we may want to change this so
2825 // that we only grab the lock if the thread was created successfully -
2826 // then we can also do this check and throw the exception in the
2827 // JavaThread constructor.
2828 if (native_thread->osthread() != NULL) {
2829 // Note: the current thread is not being used within "prepare".
2830 native_thread->prepare(jthread);
2831 }
2832 }
2833 }
2834
2835 if (throw_illegal_thread_state) {
2836 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2837 }
2838
2839 assert(native_thread != NULL, "Starting null thread?");
2840
2841 if (native_thread->osthread() == NULL) {
2842 // No one should hold a reference to the 'native_thread'.
2843 native_thread->smr_delete();
2844 if (JvmtiExport::should_post_resource_exhausted()) {
2845 JvmtiExport::post_resource_exhausted(
2846 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2847 os::native_thread_creation_failed_msg());
2848 }
2849 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2850 os::native_thread_creation_failed_msg());
2851 }
2852
2853 Thread::start(native_thread);
2854
2855 JVM_END
2856
2857
2858 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2859 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2860 // but is thought to be reliable and simple. In the case, where the receiver is the
2861 // same thread as the sender, no VM_Operation is needed.
2862 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2863 JVMWrapper("JVM_StopThread");
2864
2865 // A nested ThreadsListHandle will grab the Threads_lock so create
2866 // tlh before we resolve throwable.
2867 ThreadsListHandle tlh(thread);
2868 oop java_throwable = JNIHandles::resolve(throwable);
2869 if (java_throwable == NULL) {
2870 THROW(vmSymbols::java_lang_NullPointerException());
2871 }
2872 oop java_thread = NULL;
2873 JavaThread* receiver = NULL;
2874 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2875 Events::log_exception(thread,
2876 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2877 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2878
2879 if (is_alive) {
2880 // jthread refers to a live JavaThread.
2881 if (thread == receiver) {
2882 // Exception is getting thrown at self so no VM_Operation needed.
2883 THROW_OOP(java_throwable);
2884 } else {
2885 // Use a VM_Operation to throw the exception.
2886 Thread::send_async_exception(java_thread, java_throwable);
2887 }
2888 } else {
2889 // Either:
2890 // - target thread has not been started before being stopped, or
2891 // - target thread already terminated
2892 // We could read the threadStatus to determine which case it is
2893 // but that is overkill as it doesn't matter. We must set the
2894 // stillborn flag for the first case, and if the thread has already
2895 // exited setting this flag has no effect.
2896 java_lang_Thread::set_stillborn(java_thread);
2897 }
2898 JVM_END
2899
2900
2901 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2902 JVMWrapper("JVM_IsThreadAlive");
2903
2904 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2905 return java_lang_Thread::is_alive(thread_oop);
2906 JVM_END
2907
2908
2909 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2910 JVMWrapper("JVM_SuspendThread");
2911
2912 ThreadsListHandle tlh(thread);
2913 JavaThread* receiver = NULL;
2914 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2915 if (is_alive) {
2916 // jthread refers to a live JavaThread.
2917 {
2918 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2919 if (receiver->is_external_suspend()) {
2920 // Don't allow nested external suspend requests. We can't return
2921 // an error from this interface so just ignore the problem.
2922 return;
2923 }
2924 if (receiver->is_exiting()) { // thread is in the process of exiting
2925 return;
2926 }
2927 receiver->set_external_suspend();
2928 }
2929
2930 // java_suspend() will catch threads in the process of exiting
2931 // and will ignore them.
2932 receiver->java_suspend();
2933
2934 // It would be nice to have the following assertion in all the
2935 // time, but it is possible for a racing resume request to have
2936 // resumed this thread right after we suspended it. Temporarily
2937 // enable this assertion if you are chasing a different kind of
2938 // bug.
2939 //
2940 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2941 // receiver->is_being_ext_suspended(), "thread is not suspended");
2942 }
2943 JVM_END
2944
2945
2946 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2947 JVMWrapper("JVM_ResumeThread");
2948
2949 ThreadsListHandle tlh(thread);
2950 JavaThread* receiver = NULL;
2951 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2952 if (is_alive) {
2953 // jthread refers to a live JavaThread.
2954
2955 // This is the original comment for this Threads_lock grab:
2956 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2957 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2958 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2959 // looks at it.
2960 //
2961 // The above comment dates back to when we had both internal and
2962 // external suspend APIs that shared a common underlying mechanism.
2963 // External suspend is now entirely cooperative and doesn't share
2964 // anything with internal suspend. That said, there are some
2965 // assumptions in the VM that an external resume grabs the
2966 // Threads_lock. We can't drop the Threads_lock grab here until we
2967 // resolve the assumptions that exist elsewhere.
2968 //
2969 MutexLocker ml(Threads_lock);
2970 receiver->java_resume();
2971 }
2972 JVM_END
2973
2974
2975 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2976 JVMWrapper("JVM_SetThreadPriority");
2977
2978 ThreadsListHandle tlh(thread);
2979 oop java_thread = NULL;
2980 JavaThread* receiver = NULL;
2981 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2982 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2983
2984 if (is_alive) {
2985 // jthread refers to a live JavaThread.
2986 Thread::set_priority(receiver, (ThreadPriority)prio);
2987 }
2988 // Implied else: If the JavaThread hasn't started yet, then the
2989 // priority set in the java.lang.Thread object above will be pushed
2990 // down when it does start.
2991 JVM_END
2992
2993
2994 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2995 JVMWrapper("JVM_Yield");
2996 if (os::dont_yield()) return;
2997 HOTSPOT_THREAD_YIELD();
2998 os::naked_yield();
2999 JVM_END
3000
3001 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3002 assert(event != NULL, "invariant");
3003 assert(event->should_commit(), "invariant");
3004 event->set_time(millis);
3005 event->commit();
3006 }
3007
3008 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3009 JVMWrapper("JVM_Sleep");
3010
3011 if (millis < 0) {
3012 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3013 }
3014
3015 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3016 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3017 }
3018
3019 // Save current thread state and restore it at the end of this block.
3020 // And set new thread state to SLEEPING.
3021 JavaThreadSleepState jtss(thread);
3022
3023 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3024 EventThreadSleep event;
3025
3026 if (millis == 0) {
3027 os::naked_yield();
3028 } else {
3029 ThreadState old_state = thread->osthread()->get_state();
3030 thread->osthread()->set_state(SLEEPING);
3031 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3032 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3033 // us while we were sleeping. We do not overwrite those.
3034 if (!HAS_PENDING_EXCEPTION) {
3035 if (event.should_commit()) {
3036 post_thread_sleep_event(&event, millis);
3037 }
3038 HOTSPOT_THREAD_SLEEP_END(1);
3039
3040 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3041 // to properly restore the thread state. That's likely wrong.
3042 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3043 }
3044 }
3045 thread->osthread()->set_state(old_state);
3046 }
3047 if (event.should_commit()) {
3048 post_thread_sleep_event(&event, millis);
3049 }
3050 HOTSPOT_THREAD_SLEEP_END(0);
3051 JVM_END
3052
3053 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3054 JVMWrapper("JVM_CurrentThread");
3055 oop jthread = thread->threadObj();
3056 assert (thread != NULL, "no current thread!");
3057 return JNIHandles::make_local(env, jthread);
3058 JVM_END
3059
3060 class CountStackFramesTC : public ThreadClosure {
3061 int _count;
3062 bool _suspended;
3063 public:
3064 CountStackFramesTC() : _count(0), _suspended(false) {}
3065 virtual void do_thread(Thread* thread) {
3066 JavaThread* jt = (JavaThread*)thread;
3067 if (!jt->is_external_suspend()) {
3068 // To keep same behavior we fail this operation,
3069 // even if it would work perfectly.
3070 return;
3071 }
3072 _suspended = true;
3073 // Count all java activation, i.e., number of vframes.
3074 for (vframeStream vfst(jt); !vfst.at_end(); vfst.next()) {
3075 // Native frames are not counted.
3076 if (!vfst.method()->is_native()) _count++;
3077 }
3078 }
3079 int count() { return _count; }
3080 int suspended() { return _suspended; }
3081 };
3082
3083 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3084 JVMWrapper("JVM_CountStackFrames");
3085
3086 ThreadsListHandle tlh(thread);
3087 JavaThread* receiver = NULL;
3088 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3089 if (is_alive) {
3090 // jthread refers to a live JavaThread.
3091 CountStackFramesTC csf;
3092 Handshake::execute(&csf, receiver);
3093 if (!csf.suspended()) {
3094 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3095 "this thread is not suspended");
3096 }
3097 return csf.count();
3098 }
3099 // Implied else: if JavaThread is not alive simply return a count of 0.
3100 return 0;
3101 JVM_END
3102
3103
3104 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3105 JVMWrapper("JVM_Interrupt");
3106
3107 ThreadsListHandle tlh(thread);
3108 JavaThread* receiver = NULL;
3109 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3110 if (is_alive) {
3111 // jthread refers to a live JavaThread.
3112 Thread::interrupt(receiver);
3113 }
3114 JVM_END
3115
3116
3117 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3118 JVMWrapper("JVM_IsInterrupted");
3119
3120 ThreadsListHandle tlh(thread);
3121 JavaThread* receiver = NULL;
3122 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3123 if (is_alive) {
3124 // jthread refers to a live JavaThread.
3125 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3126 } else {
3127 return JNI_FALSE;
3128 }
3129 JVM_END
3130
3131
3132 // Return true iff the current thread has locked the object passed in
3133
3134 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3135 JVMWrapper("JVM_HoldsLock");
3136 assert(THREAD->is_Java_thread(), "sanity check");
3137 if (obj == NULL) {
3138 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3139 }
3140 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3141 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3142 JVM_END
3143
3144
3145 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3146 JVMWrapper("JVM_DumpAllStacks");
3147 VM_PrintThreads op;
3148 VMThread::execute(&op);
3149 if (JvmtiExport::should_post_data_dump()) {
3150 JvmtiExport::post_data_dump();
3151 }
3152 JVM_END
3153
3154 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3155 JVMWrapper("JVM_SetNativeThreadName");
3156
3157 // We don't use a ThreadsListHandle here because the current thread
3158 // must be alive.
3159 oop java_thread = JNIHandles::resolve_non_null(jthread);
3160 JavaThread* thr = java_lang_Thread::thread(java_thread);
3161 if (thread == thr && !thr->has_attached_via_jni()) {
3162 // Thread naming is only supported for the current thread and
3163 // we don't set the name of an attached thread to avoid stepping
3164 // on other programs.
3165 ResourceMark rm(thread);
3166 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3167 os::set_native_thread_name(thread_name);
3168 }
3169 JVM_END
3170
3171 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3172
3173 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3174 JVMWrapper("JVM_GetClassContext");
3175 ResourceMark rm(THREAD);
3176 JvmtiVMObjectAllocEventCollector oam;
3177 vframeStream vfst(thread);
3178
3179 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3180 // This must only be called from SecurityManager.getClassContext
3181 Method* m = vfst.method();
3182 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3183 m->name() == vmSymbols::getClassContext_name() &&
3184 m->signature() == vmSymbols::void_class_array_signature())) {
3185 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3186 }
3187 }
3188
3189 // Collect method holders
3190 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3191 for (; !vfst.at_end(); vfst.security_next()) {
3192 Method* m = vfst.method();
3193 // Native frames are not returned
3194 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3195 Klass* holder = m->method_holder();
3196 assert(holder->is_klass(), "just checking");
3197 klass_array->append(holder);
3198 }
3199 }
3200
3201 // Create result array of type [Ljava/lang/Class;
3202 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3203 // Fill in mirrors corresponding to method holders
3204 for (int i = 0; i < klass_array->length(); i++) {
3205 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3206 }
3207
3208 return (jobjectArray) JNIHandles::make_local(env, result);
3209 JVM_END
3210
3211
3212 // java.lang.Package ////////////////////////////////////////////////////////////////
3213
3214
3215 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3216 JVMWrapper("JVM_GetSystemPackage");
3217 ResourceMark rm(THREAD);
3218 JvmtiVMObjectAllocEventCollector oam;
3219 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3220 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3221 return (jstring) JNIHandles::make_local(result);
3222 JVM_END
3223
3224
3225 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3226 JVMWrapper("JVM_GetSystemPackages");
3227 JvmtiVMObjectAllocEventCollector oam;
3228 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3229 return (jobjectArray) JNIHandles::make_local(result);
3230 JVM_END
3231
3232
3233 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3234
3235
3236 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3237 JVMWrapper("JVM_GetAndClearReferencePendingList");
3238
3239 MonitorLocker ml(Heap_lock);
3240 oop ref = Universe::reference_pending_list();
3241 if (ref != NULL) {
3242 Universe::set_reference_pending_list(NULL);
3243 }
3244 return JNIHandles::make_local(env, ref);
3245 JVM_END
3246
3247 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3248 JVMWrapper("JVM_HasReferencePendingList");
3249 MonitorLocker ml(Heap_lock);
3250 return Universe::has_reference_pending_list();
3251 JVM_END
3252
3253 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3254 JVMWrapper("JVM_WaitForReferencePendingList");
3255 MonitorLocker ml(Heap_lock);
3256 while (!Universe::has_reference_pending_list()) {
3257 ml.wait();
3258 }
3259 JVM_END
3260
3261
3262 // ObjectInputStream ///////////////////////////////////////////////////////////////
3263
3264 // Return the first user-defined class loader up the execution stack, or null
3265 // if only code from the bootstrap or platform class loader is on the stack.
3266
3267 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3268 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3269 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3270 oop loader = vfst.method()->method_holder()->class_loader();
3271 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3272 return JNIHandles::make_local(env, loader);
3273 }
3274 }
3275 return NULL;
3276 JVM_END
3277
3278
3279 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3280
3281
3282 // resolve array handle and check arguments
3283 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3284 if (arr == NULL) {
3285 THROW_0(vmSymbols::java_lang_NullPointerException());
3286 }
3287 oop a = JNIHandles::resolve_non_null(arr);
3288 if (!a->is_array()) {
3289 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3290 } else if (type_array_only && !a->is_typeArray()) {
3291 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3292 }
3293 return arrayOop(a);
3294 }
3295
3296
3297 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3298 JVMWrapper("JVM_GetArrayLength");
3299 arrayOop a = check_array(env, arr, false, CHECK_0);
3300 return a->length();
3301 JVM_END
3302
3303
3304 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3305 JVMWrapper("JVM_Array_Get");
3306 JvmtiVMObjectAllocEventCollector oam;
3307 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3308 jvalue value;
3309 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3310 oop box = Reflection::box(&value, type, CHECK_NULL);
3311 return JNIHandles::make_local(env, box);
3312 JVM_END
3313
3314
3315 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3316 JVMWrapper("JVM_GetPrimitiveArrayElement");
3317 jvalue value;
3318 value.i = 0; // to initialize value before getting used in CHECK
3319 arrayOop a = check_array(env, arr, true, CHECK_(value));
3320 assert(a->is_typeArray(), "just checking");
3321 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3322 BasicType wide_type = (BasicType) wCode;
3323 if (type != wide_type) {
3324 Reflection::widen(&value, type, wide_type, CHECK_(value));
3325 }
3326 return value;
3327 JVM_END
3328
3329
3330 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3331 JVMWrapper("JVM_SetArrayElement");
3332 arrayOop a = check_array(env, arr, false, CHECK);
3333 oop box = JNIHandles::resolve(val);
3334 jvalue value;
3335 value.i = 0; // to initialize value before getting used in CHECK
3336 BasicType value_type;
3337 if (a->is_objArray()) {
3338 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3339 value_type = Reflection::unbox_for_regular_object(box, &value);
3340 } else {
3341 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3342 }
3343 Reflection::array_set(&value, a, index, value_type, CHECK);
3344 JVM_END
3345
3346
3347 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3348 JVMWrapper("JVM_SetPrimitiveArrayElement");
3349 arrayOop a = check_array(env, arr, true, CHECK);
3350 assert(a->is_typeArray(), "just checking");
3351 BasicType value_type = (BasicType) vCode;
3352 Reflection::array_set(&v, a, index, value_type, CHECK);
3353 JVM_END
3354
3355
3356 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3357 JVMWrapper("JVM_NewArray");
3358 JvmtiVMObjectAllocEventCollector oam;
3359 oop element_mirror = JNIHandles::resolve(eltClass);
3360 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3361 return JNIHandles::make_local(env, result);
3362 JVM_END
3363
3364
3365 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3366 JVMWrapper("JVM_NewMultiArray");
3367 JvmtiVMObjectAllocEventCollector oam;
3368 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3369 oop element_mirror = JNIHandles::resolve(eltClass);
3370 assert(dim_array->is_typeArray(), "just checking");
3371 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3372 return JNIHandles::make_local(env, result);
3373 JVM_END
3374
3375
3376 // Library support ///////////////////////////////////////////////////////////////////////////
3377
3378 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3379 //%note jvm_ct
3380 JVMWrapper("JVM_LoadLibrary");
3381 char ebuf[1024];
3382 void *load_result;
3383 {
3384 ThreadToNativeFromVM ttnfvm(thread);
3385 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3386 }
3387 if (load_result == NULL) {
3388 char msg[1024];
3389 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3390 // Since 'ebuf' may contain a string encoded using
3391 // platform encoding scheme, we need to pass
3392 // Exceptions::unsafe_to_utf8 to the new_exception method
3393 // as the last argument. See bug 6367357.
3394 Handle h_exception =
3395 Exceptions::new_exception(thread,
3396 vmSymbols::java_lang_UnsatisfiedLinkError(),
3397 msg, Exceptions::unsafe_to_utf8);
3398
3399 THROW_HANDLE_0(h_exception);
3400 }
3401 return load_result;
3402 JVM_END
3403
3404
3405 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3406 JVMWrapper("JVM_UnloadLibrary");
3407 os::dll_unload(handle);
3408 JVM_END
3409
3410
3411 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3412 JVMWrapper("JVM_FindLibraryEntry");
3413 return os::dll_lookup(handle, name);
3414 JVM_END
3415
3416
3417 // JNI version ///////////////////////////////////////////////////////////////////////////////
3418
3419 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3420 JVMWrapper("JVM_IsSupportedJNIVersion");
3421 return Threads::is_supported_jni_version_including_1_1(version);
3422 JVM_END
3423
3424
3425 // String support ///////////////////////////////////////////////////////////////////////////
3426
3427 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3428 JVMWrapper("JVM_InternString");
3429 JvmtiVMObjectAllocEventCollector oam;
3430 if (str == NULL) return NULL;
3431 oop string = JNIHandles::resolve_non_null(str);
3432 oop result = StringTable::intern(string, CHECK_NULL);
3433 return (jstring) JNIHandles::make_local(env, result);
3434 JVM_END
3435
3436
3437 // Raw monitor support //////////////////////////////////////////////////////////////////////
3438
3439 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3440 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3441 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3442 // that only works with java threads.
3443
3444
3445 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3446 VM_Exit::block_if_vm_exited();
3447 JVMWrapper("JVM_RawMonitorCreate");
3448 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3449 }
3450
3451
3452 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3453 VM_Exit::block_if_vm_exited();
3454 JVMWrapper("JVM_RawMonitorDestroy");
3455 delete ((Mutex*) mon);
3456 }
3457
3458
3459 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3460 VM_Exit::block_if_vm_exited();
3461 JVMWrapper("JVM_RawMonitorEnter");
3462 ((Mutex*) mon)->jvm_raw_lock();
3463 return 0;
3464 }
3465
3466
3467 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3468 VM_Exit::block_if_vm_exited();
3469 JVMWrapper("JVM_RawMonitorExit");
3470 ((Mutex*) mon)->jvm_raw_unlock();
3471 }
3472
3473
3474 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3475
3476 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3477 Handle loader, Handle protection_domain,
3478 jboolean throwError, TRAPS) {
3479 // Security Note:
3480 // The Java level wrapper will perform the necessary security check allowing
3481 // us to pass the NULL as the initiating class loader. The VM is responsible for
3482 // the checkPackageAccess relative to the initiating class loader via the
3483 // protection_domain. The protection_domain is passed as NULL by the java code
3484 // if there is no security manager in 3-arg Class.forName().
3485 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3486
3487 // Check if we should initialize the class
3488 if (init && klass->is_instance_klass()) {
3489 klass->initialize(CHECK_NULL);
3490 }
3491 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3492 }
3493
3494
3495 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3496
3497 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3498 JVMWrapper("JVM_InvokeMethod");
3499 Handle method_handle;
3500 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3501 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3502 Handle receiver(THREAD, JNIHandles::resolve(obj));
3503 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3504 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3505 jobject res = JNIHandles::make_local(env, result);
3506 if (JvmtiExport::should_post_vm_object_alloc()) {
3507 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3508 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3509 if (java_lang_Class::is_primitive(ret_type)) {
3510 // Only for primitive type vm allocates memory for java object.
3511 // See box() method.
3512 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3513 }
3514 }
3515 return res;
3516 } else {
3517 THROW_0(vmSymbols::java_lang_StackOverflowError());
3518 }
3519 JVM_END
3520
3521
3522 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3523 JVMWrapper("JVM_NewInstanceFromConstructor");
3524 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3525 oop constructor_mirror = JNIHandles::resolve(c);
3526 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3527 jobject res = JNIHandles::make_local(env, result);
3528 if (JvmtiExport::should_post_vm_object_alloc()) {
3529 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3530 }
3531 return res;
3532 JVM_END
3533
3534 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3535
3536 JVM_LEAF(jboolean, JVM_SupportsCX8())
3537 JVMWrapper("JVM_SupportsCX8");
3538 return VM_Version::supports_cx8();
3539 JVM_END
3540
3541 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3542 JVMWrapper("JVM_InitializeFromArchive");
3543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3544 assert(k->is_klass(), "just checking");
3545 HeapShared::initialize_from_archived_subgraph(k);
3546 JVM_END
3547
3548 // Returns an array of all live Thread objects (VM internal JavaThreads,
3549 // jvmti agent threads, and JNI attaching threads are skipped)
3550 // See CR 6404306 regarding JNI attaching threads
3551 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3552 ResourceMark rm(THREAD);
3553 ThreadsListEnumerator tle(THREAD, false, false);
3554 JvmtiVMObjectAllocEventCollector oam;
3555
3556 int num_threads = tle.num_threads();
3557 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3558 objArrayHandle threads_ah(THREAD, r);
3559
3560 for (int i = 0; i < num_threads; i++) {
3561 Handle h = tle.get_threadObj(i);
3562 threads_ah->obj_at_put(i, h());
3563 }
3564
3565 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3566 JVM_END
3567
3568
3569 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3570 // Return StackTraceElement[][], each element is the stack trace of a thread in
3571 // the corresponding entry in the given threads array
3572 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3573 JVMWrapper("JVM_DumpThreads");
3574 JvmtiVMObjectAllocEventCollector oam;
3575
3576 // Check if threads is null
3577 if (threads == NULL) {
3578 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3579 }
3580
3581 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3582 objArrayHandle ah(THREAD, a);
3583 int num_threads = ah->length();
3584 // check if threads is non-empty array
3585 if (num_threads == 0) {
3586 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3587 }
3588
3589 // check if threads is not an array of objects of Thread class
3590 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3591 if (k != SystemDictionary::Thread_klass()) {
3592 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3593 }
3594
3595 ResourceMark rm(THREAD);
3596
3597 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3598 for (int i = 0; i < num_threads; i++) {
3599 oop thread_obj = ah->obj_at(i);
3600 instanceHandle h(THREAD, (instanceOop) thread_obj);
3601 thread_handle_array->append(h);
3602 }
3603
3604 // The JavaThread references in thread_handle_array are validated
3605 // in VM_ThreadDump::doit().
3606 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3607 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3608
3609 JVM_END
3610
3611 // JVM monitoring and management support
3612 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3613 return Management::get_jmm_interface(version);
3614 JVM_END
3615
3616 // com.sun.tools.attach.VirtualMachine agent properties support
3617 //
3618 // Initialize the agent properties with the properties maintained in the VM
3619 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3620 JVMWrapper("JVM_InitAgentProperties");
3621 ResourceMark rm;
3622
3623 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3624
3625 PUTPROP(props, "sun.java.command", Arguments::java_command());
3626 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3627 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3628 return properties;
3629 JVM_END
3630
3631 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3632 {
3633 JVMWrapper("JVM_GetEnclosingMethodInfo");
3634 JvmtiVMObjectAllocEventCollector oam;
3635
3636 if (ofClass == NULL) {
3637 return NULL;
3638 }
3639 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3640 // Special handling for primitive objects
3641 if (java_lang_Class::is_primitive(mirror())) {
3642 return NULL;
3643 }
3644 Klass* k = java_lang_Class::as_Klass(mirror());
3645 if (!k->is_instance_klass()) {
3646 return NULL;
3647 }
3648 InstanceKlass* ik = InstanceKlass::cast(k);
3649 int encl_method_class_idx = ik->enclosing_method_class_index();
3650 if (encl_method_class_idx == 0) {
3651 return NULL;
3652 }
3653 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3654 objArrayHandle dest(THREAD, dest_o);
3655 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3656 dest->obj_at_put(0, enc_k->java_mirror());
3657 int encl_method_method_idx = ik->enclosing_method_method_index();
3658 if (encl_method_method_idx != 0) {
3659 Symbol* sym = ik->constants()->symbol_at(
3660 extract_low_short_from_int(
3661 ik->constants()->name_and_type_at(encl_method_method_idx)));
3662 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3663 dest->obj_at_put(1, str());
3664 sym = ik->constants()->symbol_at(
3665 extract_high_short_from_int(
3666 ik->constants()->name_and_type_at(encl_method_method_idx)));
3667 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3668 dest->obj_at_put(2, str());
3669 }
3670 return (jobjectArray) JNIHandles::make_local(dest());
3671 }
3672 JVM_END
3673
3674 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3675 {
3676 memset(info, 0, info_size);
3677
3678 info->jvm_version = VM_Version::jvm_version();
3679 info->patch_version = VM_Version::vm_patch_version();
3680
3681 // when we add a new capability in the jvm_version_info struct, we should also
3682 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3683 // counter defined in runtimeService.cpp.
3684 info->is_attach_supported = AttachListener::is_attach_supported();
3685 }
3686 JVM_END
3687
3688 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3689 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3690 ResourceMark rm(THREAD);
3691
3692 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3693 return NULL;
3694 }
3695
3696 char** vm_flags = Arguments::jvm_flags_array();
3697 char** vm_args = Arguments::jvm_args_array();
3698 int num_flags = Arguments::num_jvm_flags();
3699 int num_args = Arguments::num_jvm_args();
3700
3701 InstanceKlass* ik = SystemDictionary::String_klass();
3702 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3703 objArrayHandle result_h(THREAD, r);
3704
3705 int index = 0;
3706 for (int j = 0; j < num_flags; j++, index++) {
3707 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3708 result_h->obj_at_put(index, h());
3709 }
3710 for (int i = 0; i < num_args; i++, index++) {
3711 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3712 result_h->obj_at_put(index, h());
3713 }
3714 return (jobjectArray) JNIHandles::make_local(env, result_h());
3715 JVM_END
3716
3717 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3718 return os::get_signal_number(name);
3719 JVM_END