1 /*
2 * Copyright (c) 1997, 2020, 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 "interpreter/bytecodeUtils.hpp"
42 #include "jfr/jfrEvents.hpp"
43 #include "logging/log.hpp"
44 #include "memory/heapShared.hpp"
45 #include "memory/oopFactory.hpp"
46 #include "memory/referenceType.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/access.inline.hpp"
50 #include "oops/constantPool.hpp"
51 #include "oops/fieldStreams.inline.hpp"
52 #include "oops/instanceKlass.hpp"
53 #include "oops/method.hpp"
54 #include "oops/recordComponent.hpp"
55 #include "oops/objArrayKlass.hpp"
56 #include "oops/objArrayOop.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "prims/jvm_misc.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "prims/jvmtiThreadState.hpp"
61 #include "prims/nativeLookup.hpp"
62 #include "prims/stackwalk.hpp"
63 #include "runtime/arguments.hpp"
64 #include "runtime/atomic.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/init.hpp"
67 #include "runtime/interfaceSupport.inline.hpp"
68 #include "runtime/deoptimization.hpp"
69 #include "runtime/handshake.hpp"
70 #include "runtime/java.hpp"
71 #include "runtime/javaCalls.hpp"
72 #include "runtime/jfieldIDWorkaround.hpp"
73 #include "runtime/jniHandles.inline.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 #include <jfr/recorder/jfrRecorder.hpp>
98
99 /*
100 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
101 such ctors and calls MUST NOT come between an oop declaration/init and its
102 usage because if objects are move this may cause various memory stomps, bus
103 errors and segfaults. Here is a cookbook for causing so called "naked oop
104 failures":
105
106 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
107 JVMWrapper("JVM_GetClassDeclaredFields");
108
109 // Object address to be held directly in mirror & not visible to GC
110 oop mirror = JNIHandles::resolve_non_null(ofClass);
111
112 // If this ctor can hit a safepoint, moving objects around, then
113 ComplexConstructor foo;
114
115 // Boom! mirror may point to JUNK instead of the intended object
116 (some dereference of mirror)
117
118 // Here's another call that may block for GC, making mirror stale
119 MutexLocker ml(some_lock);
120
121 // And here's an initializer that can result in a stale oop
122 // all in one step.
123 oop o = call_that_can_throw_exception(TRAPS);
124
125
126 The solution is to keep the oop declaration BELOW the ctor or function
127 call that might cause a GC, do another resolve to reassign the oop, or
128 consider use of a Handle instead of an oop so there is immunity from object
129 motion. But note that the "QUICK" entries below do not have a handlemark
130 and thus can only support use of handles passed in.
131 */
132
133 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
134 ResourceMark rm;
135 int line_number = -1;
136 const char * source_file = NULL;
137 const char * trace = "explicit";
138 InstanceKlass* caller = NULL;
139 JavaThread* jthread = JavaThread::current();
140 if (jthread->has_last_Java_frame()) {
141 vframeStream vfst(jthread);
142
143 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
144 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
145 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
146 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
147 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
148
149 Method* last_caller = NULL;
150
151 while (!vfst.at_end()) {
152 Method* m = vfst.method();
153 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
154 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
155 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
156 break;
157 }
158 last_caller = m;
159 vfst.next();
160 }
161 // if this is called from Class.forName0 and that is called from Class.forName,
162 // then print the caller of Class.forName. If this is Class.loadClass, then print
163 // that caller, otherwise keep quiet since this should be picked up elsewhere.
164 bool found_it = false;
165 if (!vfst.at_end() &&
166 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
167 vfst.method()->name() == vmSymbols::forName0_name()) {
168 vfst.next();
169 if (!vfst.at_end() &&
170 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
171 vfst.method()->name() == vmSymbols::forName_name()) {
172 vfst.next();
173 found_it = true;
174 }
175 } else if (last_caller != NULL &&
176 last_caller->method_holder()->name() ==
177 vmSymbols::java_lang_ClassLoader() &&
178 last_caller->name() == vmSymbols::loadClass_name()) {
179 found_it = true;
180 } else if (!vfst.at_end()) {
181 if (vfst.method()->is_native()) {
182 // JNI call
183 found_it = true;
184 }
185 }
186 if (found_it && !vfst.at_end()) {
187 // found the caller
188 caller = vfst.method()->method_holder();
189 line_number = vfst.method()->line_number_from_bci(vfst.bci());
190 if (line_number == -1) {
191 // show method name if it's a native method
192 trace = vfst.method()->name_and_sig_as_C_string();
193 }
194 Symbol* s = caller->source_file_name();
195 if (s != NULL) {
196 source_file = s->as_C_string();
197 }
198 }
199 }
200 if (caller != NULL) {
201 if (to_class != caller) {
202 const char * from = caller->external_name();
203 const char * to = to_class->external_name();
204 // print in a single call to reduce interleaving between threads
205 if (source_file != NULL) {
206 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
207 } else {
208 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
209 }
210 }
211 }
212 }
213
214 void trace_class_resolution(Klass* to_class) {
215 EXCEPTION_MARK;
216 trace_class_resolution_impl(to_class, THREAD);
217 if (HAS_PENDING_EXCEPTION) {
218 CLEAR_PENDING_EXCEPTION;
219 }
220 }
221
222 // Wrapper to trace JVM functions
223
224 #ifdef ASSERT
225 Histogram* JVMHistogram;
226 volatile int JVMHistogram_lock = 0;
227
228 class JVMHistogramElement : public HistogramElement {
229 public:
230 JVMHistogramElement(const char* name);
231 };
232
233 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
234 _name = elementName;
235 uintx count = 0;
236
237 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) {
238 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) {
239 count +=1;
240 if ( (WarnOnStalledSpinLock > 0)
241 && (count % WarnOnStalledSpinLock == 0)) {
242 warning("JVMHistogram_lock seems to be stalled");
243 }
244 }
245 }
246
247 if(JVMHistogram == NULL)
248 JVMHistogram = new Histogram("JVM Call Counts",100);
249
250 JVMHistogram->add_element(this);
251 Atomic::dec(&JVMHistogram_lock);
252 }
253
254 #define JVMCountWrapper(arg) \
255 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
256 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
257
258 #define JVMWrapper(arg) JVMCountWrapper(arg);
259 #else
260 #define JVMWrapper(arg)
261 #endif
262
263
264 // Interface version /////////////////////////////////////////////////////////////////////
265
266
267 JVM_LEAF(jint, JVM_GetInterfaceVersion())
268 return JVM_INTERFACE_VERSION;
269 JVM_END
270
271
272 // java.lang.System //////////////////////////////////////////////////////////////////////
273
274
275 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
276 JVMWrapper("JVM_CurrentTimeMillis");
277 return os::javaTimeMillis();
278 JVM_END
279
280 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
281 JVMWrapper("JVM_NanoTime");
282 return os::javaTimeNanos();
283 JVM_END
284
285 // The function below is actually exposed by jdk.internal.misc.VM and not
286 // java.lang.System, but we choose to keep it here so that it stays next
287 // to JVM_CurrentTimeMillis and JVM_NanoTime
288
289 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
290 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
291
292 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
293 JVMWrapper("JVM_GetNanoTimeAdjustment");
294 jlong seconds;
295 jlong nanos;
296
297 os::javaTimeSystemUTC(seconds, nanos);
298
299 // We're going to verify that the result can fit in a long.
300 // For that we need the difference in seconds between 'seconds'
301 // and 'offset_secs' to be such that:
302 // |seconds - offset_secs| < (2^63/10^9)
303 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
304 // which makes |seconds - offset_secs| < 2^33
305 // and we will prefer +/- 2^32 as the maximum acceptable diff
306 // as 2^32 has a more natural feel than 2^33...
307 //
308 // So if |seconds - offset_secs| >= 2^32 - we return a special
309 // sentinel value (-1) which the caller should take as an
310 // exception value indicating that the offset given to us is
311 // too far from range of the current time - leading to too big
312 // a nano adjustment. The caller is expected to recover by
313 // computing a more accurate offset and calling this method
314 // again. (For the record 2^32 secs is ~136 years, so that
315 // should rarely happen)
316 //
317 jlong diff = seconds - offset_secs;
318 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
319 return -1; // sentinel value: the offset is too far off the target
320 }
321
322 // return the adjustment. If you compute a time by adding
323 // this number of nanoseconds along with the number of seconds
324 // in the offset you should get the current UTC time.
325 return (diff * (jlong)1000000000) + nanos;
326 JVM_END
327
328 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
329 jobject dst, jint dst_pos, jint length))
330 JVMWrapper("JVM_ArrayCopy");
331 // Check if we have null pointers
332 if (src == NULL || dst == NULL) {
333 THROW(vmSymbols::java_lang_NullPointerException());
334 }
335 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
336 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
337 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
338 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
339 // Do copy
340 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
341 JVM_END
342
343
344 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
345 JavaValue r(T_OBJECT);
346 // public synchronized Object put(Object key, Object value);
347 HandleMark hm(THREAD);
348 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
349 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
350 JavaCalls::call_virtual(&r,
351 props,
352 SystemDictionary::Properties_klass(),
353 vmSymbols::put_name(),
354 vmSymbols::object_object_object_signature(),
355 key_str,
356 value_str,
357 THREAD);
358 }
359
360
361 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
362
363 /*
364 * Return all of the system properties in a Java String array with alternating
365 * names and values from the jvm SystemProperty.
366 * Which includes some internal and all commandline -D defined properties.
367 */
368 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
369 JVMWrapper("JVM_GetProperties");
370 ResourceMark rm(THREAD);
371 HandleMark hm(THREAD);
372 int ndx = 0;
373 int fixedCount = 2;
374
375 SystemProperty* p = Arguments::system_properties();
376 int count = Arguments::PropertyList_count(p);
377
378 // Allocate result String array
379 InstanceKlass* ik = SystemDictionary::String_klass();
380 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
381 objArrayHandle result_h(THREAD, r);
382
383 while (p != NULL) {
384 const char * key = p->key();
385 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
386 const char * value = p->value();
387 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
388 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
389 result_h->obj_at_put(ndx * 2, key_str());
390 result_h->obj_at_put(ndx * 2 + 1, value_str());
391 ndx++;
392 }
393 p = p->next();
394 }
395
396 // Convert the -XX:MaxDirectMemorySize= command line flag
397 // to the sun.nio.MaxDirectMemorySize property.
398 // Do this after setting user properties to prevent people
399 // from setting the value with a -D option, as requested.
400 // Leave empty if not supplied
401 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
402 char as_chars[256];
403 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
404 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
405 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
406 result_h->obj_at_put(ndx * 2, key_str());
407 result_h->obj_at_put(ndx * 2 + 1, value_str());
408 ndx++;
409 }
410
411 // JVM monitoring and management support
412 // Add the sun.management.compiler property for the compiler's name
413 {
414 #undef CSIZE
415 #if defined(_LP64) || defined(_WIN64)
416 #define CSIZE "64-Bit "
417 #else
418 #define CSIZE
419 #endif // 64bit
420
421 #ifdef TIERED
422 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
423 #else
424 #if defined(COMPILER1)
425 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
426 #elif defined(COMPILER2)
427 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
428 #elif INCLUDE_JVMCI
429 #error "INCLUDE_JVMCI should imply TIERED"
430 #else
431 const char* compiler_name = "";
432 #endif // compilers
433 #endif // TIERED
434
435 if (*compiler_name != '\0' &&
436 (Arguments::mode() != Arguments::_int)) {
437 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
438 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
439 result_h->obj_at_put(ndx * 2, key_str());
440 result_h->obj_at_put(ndx * 2 + 1, value_str());
441 ndx++;
442 }
443 }
444
445 return (jobjectArray) JNIHandles::make_local(env, result_h());
446 JVM_END
447
448
449 /*
450 * Return the temporary directory that the VM uses for the attach
451 * and perf data files.
452 *
453 * It is important that this directory is well-known and the
454 * same for all VM instances. It cannot be affected by configuration
455 * variables such as java.io.tmpdir.
456 */
457 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
458 JVMWrapper("JVM_GetTemporaryDirectory");
459 HandleMark hm(THREAD);
460 const char* temp_dir = os::get_temp_directory();
461 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
462 return (jstring) JNIHandles::make_local(env, h());
463 JVM_END
464
465
466 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
467
468 extern volatile jint vm_created;
469
470 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
471 JVMWrapper("JVM_BeforeHalt");
472 EventShutdown event;
473 if (event.should_commit()) {
474 event.set_reason("Shutdown requested from Java");
475 event.commit();
476 }
477 JVM_END
478
479
480 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
481 before_exit(thread);
482 vm_exit(code);
483 JVM_END
484
485
486 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
487 JVMWrapper("JVM_GC");
488 if (!DisableExplicitGC) {
489 Universe::heap()->collect(GCCause::_java_lang_system_gc);
490 }
491 JVM_END
492
493
494 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
495 JVMWrapper("JVM_MaxObjectInspectionAge");
496 return Universe::heap()->millis_since_last_gc();
497 JVM_END
498
499
500 static inline jlong convert_size_t_to_jlong(size_t val) {
501 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
502 NOT_LP64 (return (jlong)val;)
503 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
504 }
505
506 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
507 JVMWrapper("JVM_TotalMemory");
508 size_t n = Universe::heap()->capacity();
509 return convert_size_t_to_jlong(n);
510 JVM_END
511
512
513 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
514 JVMWrapper("JVM_FreeMemory");
515 size_t n = Universe::heap()->unused();
516 return convert_size_t_to_jlong(n);
517 JVM_END
518
519
520 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
521 JVMWrapper("JVM_MaxMemory");
522 size_t n = Universe::heap()->max_capacity();
523 return convert_size_t_to_jlong(n);
524 JVM_END
525
526
527 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
528 JVMWrapper("JVM_ActiveProcessorCount");
529 return os::active_processor_count();
530 JVM_END
531
532
533
534 // java.lang.Throwable //////////////////////////////////////////////////////
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 // java.lang.NullPointerException ///////////////////////////////////////////
543
544 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
545 if (!ShowCodeDetailsInExceptionMessages) return NULL;
546
547 oop exc = JNIHandles::resolve_non_null(throwable);
548
549 Method* method;
550 int bci;
551 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
552 return NULL;
553 }
554 if (method->is_native()) {
555 return NULL;
556 }
557
558 stringStream ss;
559 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
560 if (ok) {
561 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_0);
562 return (jstring) JNIHandles::make_local(env, result);
563 } else {
564 return NULL;
565 }
566 JVM_END
567
568 // java.lang.StackTraceElement //////////////////////////////////////////////
569
570
571 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
572 JVMWrapper("JVM_InitStackTraceElementArray");
573 Handle exception(THREAD, JNIHandles::resolve(throwable));
574 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
575 objArrayHandle stack_trace(THREAD, st);
576 // Fill in the allocated stack trace
577 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
578 JVM_END
579
580
581 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
582 JVMWrapper("JVM_InitStackTraceElement");
583 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
584 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
585 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
586 JVM_END
587
588
589 // java.lang.StackWalker //////////////////////////////////////////////////////
590
591
592 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
593 jint skip_frames, jint frame_count, jint start_index,
594 jobjectArray frames))
595 JVMWrapper("JVM_CallStackWalk");
596 JavaThread* jt = (JavaThread*) THREAD;
597 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
598 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
599 }
600
601 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
602
603 // frames array is a Class<?>[] array when only getting caller reference,
604 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
605 // be null.
606 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
607 objArrayHandle frames_array_h(THREAD, fa);
608
609 int limit = start_index + frame_count;
610 if (frames_array_h->length() < limit) {
611 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
612 }
613
614 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
615 start_index, frames_array_h, CHECK_NULL);
616 return JNIHandles::make_local(env, result);
617 JVM_END
618
619
620 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
621 jint frame_count, jint start_index,
622 jobjectArray frames))
623 JVMWrapper("JVM_MoreStackWalk");
624 JavaThread* jt = (JavaThread*) THREAD;
625
626 // frames array is a Class<?>[] array when only getting caller reference,
627 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
628 // be null.
629 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
630 objArrayHandle frames_array_h(THREAD, fa);
631
632 int limit = start_index+frame_count;
633 if (frames_array_h->length() < limit) {
634 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
635 }
636
637 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
638 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
639 start_index, frames_array_h, THREAD);
640 JVM_END
641
642 // java.lang.Object ///////////////////////////////////////////////
643
644
645 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
646 JVMWrapper("JVM_IHashCode");
647 // as implemented in the classic virtual machine; return 0 if object is NULL
648 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
649 JVM_END
650
651
652 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
653 JVMWrapper("JVM_MonitorWait");
654 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
655 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
656 if (JvmtiExport::should_post_monitor_wait()) {
657 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
658
659 // The current thread already owns the monitor and it has not yet
660 // been added to the wait queue so the current thread cannot be
661 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
662 // event handler cannot accidentally consume an unpark() meant for
663 // the ParkEvent associated with this ObjectMonitor.
664 }
665 ObjectSynchronizer::wait(obj, ms, CHECK);
666 JVM_END
667
668
669 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
670 JVMWrapper("JVM_MonitorNotify");
671 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
672 ObjectSynchronizer::notify(obj, CHECK);
673 JVM_END
674
675
676 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
677 JVMWrapper("JVM_MonitorNotifyAll");
678 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
679 ObjectSynchronizer::notifyall(obj, CHECK);
680 JVM_END
681
682
683 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
684 JVMWrapper("JVM_Clone");
685 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
686 Klass* klass = obj->klass();
687 JvmtiVMObjectAllocEventCollector oam;
688
689 #ifdef ASSERT
690 // Just checking that the cloneable flag is set correct
691 if (obj->is_array()) {
692 guarantee(klass->is_cloneable(), "all arrays are cloneable");
693 } else {
694 guarantee(obj->is_instance(), "should be instanceOop");
695 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
696 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
697 }
698 #endif
699
700 // Check if class of obj supports the Cloneable interface.
701 // All arrays are considered to be cloneable (See JLS 20.1.5).
702 // All j.l.r.Reference classes are considered non-cloneable.
703 if (!klass->is_cloneable() ||
704 (klass->is_instance_klass() &&
705 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
706 ResourceMark rm(THREAD);
707 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
708 }
709
710 // Make shallow object copy
711 const int size = obj->size();
712 oop new_obj_oop = NULL;
713 if (obj->is_array()) {
714 const int length = ((arrayOop)obj())->length();
715 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
716 /* do_zero */ true, CHECK_NULL);
717 } else {
718 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
719 }
720
721 HeapAccess<>::clone(obj(), new_obj_oop, size);
722
723 Handle new_obj(THREAD, new_obj_oop);
724 // Caution: this involves a java upcall, so the clone should be
725 // "gc-robust" by this stage.
726 if (klass->has_finalizer()) {
727 assert(obj->is_instance(), "should be instanceOop");
728 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
729 new_obj = Handle(THREAD, new_obj_oop);
730 }
731
732 return JNIHandles::make_local(env, new_obj());
733 JVM_END
734
735 // java.io.File ///////////////////////////////////////////////////////////////
736
737 JVM_LEAF(char*, JVM_NativePath(char* path))
738 JVMWrapper("JVM_NativePath");
739 return os::native_path(path);
740 JVM_END
741
742
743 // Misc. class handling ///////////////////////////////////////////////////////////
744
745
746 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
747 JVMWrapper("JVM_GetCallerClass");
748
749 // Getting the class of the caller frame.
750 //
751 // The call stack at this point looks something like this:
752 //
753 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
754 // [1] [ @CallerSensitive API.method ]
755 // [.] [ (skipped intermediate frames) ]
756 // [n] [ caller ]
757 vframeStream vfst(thread);
758 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
759 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
760 Method* m = vfst.method();
761 assert(m != NULL, "sanity");
762 switch (n) {
763 case 0:
764 // This must only be called from Reflection.getCallerClass
765 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
766 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
767 }
768 // fall-through
769 case 1:
770 // Frame 0 and 1 must be caller sensitive.
771 if (!m->caller_sensitive()) {
772 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
773 }
774 break;
775 default:
776 if (!m->is_ignored_by_security_stack_walk()) {
777 // We have reached the desired frame; return the holder class.
778 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
779 }
780 break;
781 }
782 }
783 return NULL;
784 JVM_END
785
786
787 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
788 JVMWrapper("JVM_FindPrimitiveClass");
789 oop mirror = NULL;
790 BasicType t = name2type(utf);
791 if (t != T_ILLEGAL && !is_reference_type(t)) {
792 mirror = Universe::java_mirror(t);
793 }
794 if (mirror == NULL) {
795 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
796 } else {
797 return (jclass) JNIHandles::make_local(env, mirror);
798 }
799 JVM_END
800
801
802 // Returns a class loaded by the bootstrap class loader; or null
803 // if not found. ClassNotFoundException is not thrown.
804 // FindClassFromBootLoader is exported to the launcher for windows.
805 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
806 const char* name))
807 JVMWrapper("JVM_FindClassFromBootLoader");
808
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 return NULL;
814 }
815
816 TempNewSymbol h_name = SymbolTable::new_symbol(name);
817 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
818 if (k == NULL) {
819 return NULL;
820 }
821
822 if (log_is_enabled(Debug, class, resolve)) {
823 trace_class_resolution(k);
824 }
825 return (jclass) JNIHandles::make_local(env, k->java_mirror());
826 JVM_END
827
828 // Find a class with this name in this loader, using the caller's protection domain.
829 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
830 jboolean init, jobject loader,
831 jclass caller))
832 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
833 // Java libraries should ensure that name is never null...
834 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
835 // It's impossible to create this class; the name cannot fit
836 // into the constant pool.
837 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
838 }
839
840 TempNewSymbol h_name = SymbolTable::new_symbol(name);
841
842 oop loader_oop = JNIHandles::resolve(loader);
843 oop from_class = JNIHandles::resolve(caller);
844 oop protection_domain = NULL;
845 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
846 // NPE. Put it in another way, the bootstrap class loader has all permission and
847 // thus no checkPackageAccess equivalence in the VM class loader.
848 // The caller is also passed as NULL by the java code if there is no security
849 // manager to avoid the performance cost of getting the calling class.
850 if (from_class != NULL && loader_oop != NULL) {
851 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
852 }
853
854 Handle h_loader(THREAD, loader_oop);
855 Handle h_prot(THREAD, protection_domain);
856 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
857 h_prot, false, THREAD);
858
859 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
860 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
861 }
862 return result;
863 JVM_END
864
865 // Currently only called from the old verifier.
866 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
867 jboolean init, jclass from))
868 JVMWrapper("JVM_FindClassFromClass");
869 if (name == NULL) {
870 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
871 }
872 if ((int)strlen(name) > Symbol::max_length()) {
873 // It's impossible to create this class; the name cannot fit
874 // into the constant pool.
875 Exceptions::fthrow(THREAD_AND_LOCATION,
876 vmSymbols::java_lang_NoClassDefFoundError(),
877 "Class name exceeds maximum length of %d: %s",
878 Symbol::max_length(),
879 name);
880 return 0;
881 }
882 TempNewSymbol h_name = SymbolTable::new_symbol(name);
883 oop from_class_oop = JNIHandles::resolve(from);
884 Klass* from_class = (from_class_oop == NULL)
885 ? (Klass*)NULL
886 : java_lang_Class::as_Klass(from_class_oop);
887 oop class_loader = NULL;
888 oop protection_domain = NULL;
889 if (from_class != NULL) {
890 class_loader = from_class->class_loader();
891 protection_domain = from_class->protection_domain();
892 }
893 Handle h_loader(THREAD, class_loader);
894 Handle h_prot (THREAD, protection_domain);
895 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
896 h_prot, true, thread);
897
898 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
899 // this function is generally only used for class loading during verification.
900 ResourceMark rm;
901 oop from_mirror = JNIHandles::resolve_non_null(from);
902 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
903 const char * from_name = from_class->external_name();
904
905 oop mirror = JNIHandles::resolve_non_null(result);
906 Klass* to_class = java_lang_Class::as_Klass(mirror);
907 const char * to = to_class->external_name();
908 log_debug(class, resolve)("%s %s (verification)", from_name, to);
909 }
910
911 return result;
912 JVM_END
913
914 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
915 if (loader.is_null()) {
916 return;
917 }
918
919 // check whether the current caller thread holds the lock or not.
920 // If not, increment the corresponding counter
921 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
922 ObjectSynchronizer::owner_self) {
923 counter->inc();
924 }
925 }
926
927 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
928 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
929 jobject loader, const jbyte *buf,
930 jsize len, jobject pd, const char *source,
931 TRAPS) {
932 if (source == NULL) source = "__JVM_DefineClass__";
933
934 assert(THREAD->is_Java_thread(), "must be a JavaThread");
935 JavaThread* jt = (JavaThread*) THREAD;
936
937 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
938 ClassLoader::perf_define_appclass_selftime(),
939 ClassLoader::perf_define_appclasses(),
940 jt->get_thread_stat()->perf_recursion_counts_addr(),
941 jt->get_thread_stat()->perf_timers_addr(),
942 PerfClassTraceTime::DEFINE_CLASS);
943
944 if (UsePerfData) {
945 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
946 }
947
948 // Since exceptions can be thrown, class initialization can take place
949 // if name is NULL no check for class name in .class stream has to be made.
950 TempNewSymbol class_name = NULL;
951 if (name != NULL) {
952 const int str_len = (int)strlen(name);
953 if (str_len > Symbol::max_length()) {
954 // It's impossible to create this class; the name cannot fit
955 // into the constant pool.
956 Exceptions::fthrow(THREAD_AND_LOCATION,
957 vmSymbols::java_lang_NoClassDefFoundError(),
958 "Class name exceeds maximum length of %d: %s",
959 Symbol::max_length(),
960 name);
961 return 0;
962 }
963 class_name = SymbolTable::new_symbol(name, str_len);
964 }
965
966 ResourceMark rm(THREAD);
967 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
968 Handle class_loader (THREAD, JNIHandles::resolve(loader));
969 if (UsePerfData) {
970 is_lock_held_by_thread(class_loader,
971 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
972 THREAD);
973 }
974 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
975 Klass* k = SystemDictionary::resolve_from_stream(class_name,
976 class_loader,
977 protection_domain,
978 &st,
979 CHECK_NULL);
980
981 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
982 trace_class_resolution(k);
983 }
984
985 return (jclass) JNIHandles::make_local(env, k->java_mirror());
986 }
987
988
989 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
990 JVMWrapper("JVM_DefineClass");
991
992 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
993 JVM_END
994
995
996 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
997 JVMWrapper("JVM_DefineClassWithSource");
998
999 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
1000 JVM_END
1001
1002 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1003 JVMWrapper("JVM_FindLoadedClass");
1004 ResourceMark rm(THREAD);
1005
1006 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1007 char* str = java_lang_String::as_utf8_string(h_name());
1008
1009 // Sanity check, don't expect null
1010 if (str == NULL) return NULL;
1011
1012 // Internalize the string, converting '.' to '/' in string.
1013 char* p = (char*)str;
1014 while (*p != '\0') {
1015 if (*p == '.') {
1016 *p = '/';
1017 }
1018 p++;
1019 }
1020
1021 const int str_len = (int)(p - str);
1022 if (str_len > Symbol::max_length()) {
1023 // It's impossible to create this class; the name cannot fit
1024 // into the constant pool.
1025 return NULL;
1026 }
1027 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1028
1029 // Security Note:
1030 // The Java level wrapper will perform the necessary security check allowing
1031 // us to pass the NULL as the initiating class loader.
1032 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1033 if (UsePerfData) {
1034 is_lock_held_by_thread(h_loader,
1035 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1036 THREAD);
1037 }
1038
1039 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1040 h_loader,
1041 Handle(),
1042 CHECK_NULL);
1043 #if INCLUDE_CDS
1044 if (k == NULL) {
1045 // If the class is not already loaded, try to see if it's in the shared
1046 // archive for the current classloader (h_loader).
1047 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1048 }
1049 #endif
1050 return (k == NULL) ? NULL :
1051 (jclass) JNIHandles::make_local(env, k->java_mirror());
1052 JVM_END
1053
1054 // Module support //////////////////////////////////////////////////////////////////////////////
1055
1056 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1057 jstring location, const char* const* packages, jsize num_packages))
1058 JVMWrapper("JVM_DefineModule");
1059 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1060 JVM_END
1061
1062 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1063 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1064 Modules::set_bootloader_unnamed_module(module, CHECK);
1065 JVM_END
1066
1067 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1068 JVMWrapper("JVM_AddModuleExports");
1069 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1070 JVM_END
1071
1072 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1073 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1074 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1075 JVM_END
1076
1077 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1078 JVMWrapper("JVM_AddModuleExportsToAll");
1079 Modules::add_module_exports(from_module, package, NULL, CHECK);
1080 JVM_END
1081
1082 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1083 JVMWrapper("JVM_AddReadsModule");
1084 Modules::add_reads_module(from_module, source_module, CHECK);
1085 JVM_END
1086
1087 // Reflection support //////////////////////////////////////////////////////////////////////////////
1088
1089 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1090 assert (cls != NULL, "illegal class");
1091 JVMWrapper("JVM_InitClassName");
1092 JvmtiVMObjectAllocEventCollector oam;
1093 ResourceMark rm(THREAD);
1094 HandleMark hm(THREAD);
1095 Handle java_class(THREAD, JNIHandles::resolve(cls));
1096 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1097 return (jstring) JNIHandles::make_local(env, result);
1098 JVM_END
1099
1100
1101 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1102 JVMWrapper("JVM_GetClassInterfaces");
1103 JvmtiVMObjectAllocEventCollector oam;
1104 oop mirror = JNIHandles::resolve_non_null(cls);
1105
1106 // Special handling for primitive objects
1107 if (java_lang_Class::is_primitive(mirror)) {
1108 // Primitive objects does not have any interfaces
1109 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1110 return (jobjectArray) JNIHandles::make_local(env, r);
1111 }
1112
1113 Klass* klass = java_lang_Class::as_Klass(mirror);
1114 // Figure size of result array
1115 int size;
1116 if (klass->is_instance_klass()) {
1117 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1118 } else {
1119 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1120 size = 2;
1121 }
1122
1123 // Allocate result array
1124 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1125 objArrayHandle result (THREAD, r);
1126 // Fill in result
1127 if (klass->is_instance_klass()) {
1128 // Regular instance klass, fill in all local interfaces
1129 for (int index = 0; index < size; index++) {
1130 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1131 result->obj_at_put(index, k->java_mirror());
1132 }
1133 } else {
1134 // All arrays implement java.lang.Cloneable and java.io.Serializable
1135 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1136 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1137 }
1138 return (jobjectArray) JNIHandles::make_local(env, result());
1139 JVM_END
1140
1141
1142 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1143 JVMWrapper("JVM_IsInterface");
1144 oop mirror = JNIHandles::resolve_non_null(cls);
1145 if (java_lang_Class::is_primitive(mirror)) {
1146 return JNI_FALSE;
1147 }
1148 Klass* k = java_lang_Class::as_Klass(mirror);
1149 jboolean result = k->is_interface();
1150 assert(!result || k->is_instance_klass(),
1151 "all interfaces are instance types");
1152 // The compiler intrinsic for isInterface tests the
1153 // Klass::_access_flags bits in the same way.
1154 return result;
1155 JVM_END
1156
1157
1158 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1159 JVMWrapper("JVM_GetClassSigners");
1160 JvmtiVMObjectAllocEventCollector oam;
1161 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1162 // There are no signers for primitive types
1163 return NULL;
1164 }
1165
1166 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1167
1168 // If there are no signers set in the class, or if the class
1169 // is an array, return NULL.
1170 if (signers == NULL) return NULL;
1171
1172 // copy of the signers array
1173 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1174 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1175 for (int index = 0; index < signers->length(); index++) {
1176 signers_copy->obj_at_put(index, signers->obj_at(index));
1177 }
1178
1179 // return the copy
1180 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1181 JVM_END
1182
1183
1184 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1185 JVMWrapper("JVM_SetClassSigners");
1186 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1187 // This call is ignored for primitive types and arrays.
1188 // Signers are only set once, ClassLoader.java, and thus shouldn't
1189 // be called with an array. Only the bootstrap loader creates arrays.
1190 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1191 if (k->is_instance_klass()) {
1192 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1193 }
1194 }
1195 JVM_END
1196
1197
1198 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1199 JVMWrapper("JVM_GetProtectionDomain");
1200 if (JNIHandles::resolve(cls) == NULL) {
1201 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1202 }
1203
1204 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1205 // Primitive types does not have a protection domain.
1206 return NULL;
1207 }
1208
1209 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1210 return (jobject) JNIHandles::make_local(env, pd);
1211 JVM_END
1212
1213
1214 // Returns the inherited_access_control_context field of the running thread.
1215 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1216 JVMWrapper("JVM_GetInheritedAccessControlContext");
1217 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1218 return JNIHandles::make_local(env, result);
1219 JVM_END
1220
1221 class RegisterArrayForGC {
1222 private:
1223 JavaThread *_thread;
1224 public:
1225 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1226 _thread = thread;
1227 _thread->register_array_for_gc(array);
1228 }
1229
1230 ~RegisterArrayForGC() {
1231 _thread->register_array_for_gc(NULL);
1232 }
1233 };
1234
1235
1236 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1237 JVMWrapper("JVM_GetStackAccessControlContext");
1238 if (!UsePrivilegedStack) return NULL;
1239
1240 ResourceMark rm(THREAD);
1241 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1242 JvmtiVMObjectAllocEventCollector oam;
1243
1244 // count the protection domains on the execution stack. We collapse
1245 // duplicate consecutive protection domains into a single one, as
1246 // well as stopping when we hit a privileged frame.
1247
1248 oop previous_protection_domain = NULL;
1249 Handle privileged_context(thread, NULL);
1250 bool is_privileged = false;
1251 oop protection_domain = NULL;
1252
1253 // Iterate through Java frames
1254 vframeStream vfst(thread);
1255 for(; !vfst.at_end(); vfst.next()) {
1256 // get method of frame
1257 Method* method = vfst.method();
1258
1259 // stop at the first privileged frame
1260 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1261 method->name() == vmSymbols::executePrivileged_name())
1262 {
1263 // this frame is privileged
1264 is_privileged = true;
1265
1266 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1267
1268 StackValueCollection* locals = priv->locals();
1269 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1270 StackValue* clr_sv = locals->at(2); // Class<?> caller
1271 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1272 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1273 privileged_context = ctx_sv->get_obj();
1274 Handle caller = clr_sv->get_obj();
1275
1276 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1277 protection_domain = caller_klass->protection_domain();
1278 } else {
1279 protection_domain = method->method_holder()->protection_domain();
1280 }
1281
1282 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1283 local_array->push(protection_domain);
1284 previous_protection_domain = protection_domain;
1285 }
1286
1287 if (is_privileged) break;
1288 }
1289
1290
1291 // either all the domains on the stack were system domains, or
1292 // we had a privileged system domain
1293 if (local_array->is_empty()) {
1294 if (is_privileged && privileged_context.is_null()) return NULL;
1295
1296 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1297 return JNIHandles::make_local(env, result);
1298 }
1299
1300 // the resource area must be registered in case of a gc
1301 RegisterArrayForGC ragc(thread, local_array);
1302 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1303 local_array->length(), CHECK_NULL);
1304 objArrayHandle h_context(thread, context);
1305 for (int index = 0; index < local_array->length(); index++) {
1306 h_context->obj_at_put(index, local_array->at(index));
1307 }
1308
1309 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1310
1311 return JNIHandles::make_local(env, result);
1312 JVM_END
1313
1314
1315 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1316 JVMWrapper("JVM_IsArrayClass");
1317 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1318 return (k != NULL) && k->is_array_klass() ? true : false;
1319 JVM_END
1320
1321
1322 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1323 JVMWrapper("JVM_IsPrimitiveClass");
1324 oop mirror = JNIHandles::resolve_non_null(cls);
1325 return (jboolean) java_lang_Class::is_primitive(mirror);
1326 JVM_END
1327
1328
1329 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1330 JVMWrapper("JVM_GetClassModifiers");
1331 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1332 // Primitive type
1333 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1334 }
1335
1336 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1337 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1338 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1339 return k->modifier_flags();
1340 JVM_END
1341
1342
1343 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1344
1345 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1346 JvmtiVMObjectAllocEventCollector oam;
1347 // ofClass is a reference to a java_lang_Class object. The mirror object
1348 // of an InstanceKlass
1349
1350 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1351 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1352 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1353 return (jobjectArray)JNIHandles::make_local(env, result);
1354 }
1355
1356 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1357 InnerClassesIterator iter(k);
1358
1359 if (iter.length() == 0) {
1360 // Neither an inner nor outer class
1361 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1362 return (jobjectArray)JNIHandles::make_local(env, result);
1363 }
1364
1365 // find inner class info
1366 constantPoolHandle cp(thread, k->constants());
1367 int length = iter.length();
1368
1369 // Allocate temp. result array
1370 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1371 objArrayHandle result (THREAD, r);
1372 int members = 0;
1373
1374 for (; !iter.done(); iter.next()) {
1375 int ioff = iter.inner_class_info_index();
1376 int ooff = iter.outer_class_info_index();
1377
1378 if (ioff != 0 && ooff != 0) {
1379 // Check to see if the name matches the class we're looking for
1380 // before attempting to find the class.
1381 if (cp->klass_name_at_matches(k, ooff)) {
1382 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1383 if (outer_klass == k) {
1384 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1385 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1386
1387 // Throws an exception if outer klass has not declared k as
1388 // an inner klass
1389 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1390
1391 result->obj_at_put(members, inner_klass->java_mirror());
1392 members++;
1393 }
1394 }
1395 }
1396 }
1397
1398 if (members != length) {
1399 // Return array of right length
1400 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1401 for(int i = 0; i < members; i++) {
1402 res->obj_at_put(i, result->obj_at(i));
1403 }
1404 return (jobjectArray)JNIHandles::make_local(env, res);
1405 }
1406
1407 return (jobjectArray)JNIHandles::make_local(env, result());
1408 JVM_END
1409
1410
1411 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1412 {
1413 // ofClass is a reference to a java_lang_Class object.
1414 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1415 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1416 return NULL;
1417 }
1418
1419 bool inner_is_member = false;
1420 Klass* outer_klass
1421 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1422 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1423 if (outer_klass == NULL) return NULL; // already a top-level class
1424 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1425 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1426 }
1427 JVM_END
1428
1429 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1430 {
1431 oop mirror = JNIHandles::resolve_non_null(cls);
1432 if (java_lang_Class::is_primitive(mirror) ||
1433 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1434 return NULL;
1435 }
1436 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1437 int ooff = 0, noff = 0;
1438 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1439 if (noff != 0) {
1440 constantPoolHandle i_cp(thread, k->constants());
1441 Symbol* name = i_cp->symbol_at(noff);
1442 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1443 return (jstring) JNIHandles::make_local(env, str());
1444 }
1445 }
1446 return NULL;
1447 }
1448 JVM_END
1449
1450 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1451 assert (cls != NULL, "illegal class");
1452 JVMWrapper("JVM_GetClassSignature");
1453 JvmtiVMObjectAllocEventCollector oam;
1454 ResourceMark rm(THREAD);
1455 // Return null for arrays and primatives
1456 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1457 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1458 if (k->is_instance_klass()) {
1459 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1460 if (sym == NULL) return NULL;
1461 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1462 return (jstring) JNIHandles::make_local(env, str());
1463 }
1464 }
1465 return NULL;
1466 JVM_END
1467
1468
1469 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1470 assert (cls != NULL, "illegal class");
1471 JVMWrapper("JVM_GetClassAnnotations");
1472
1473 // Return null for arrays and primitives
1474 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1475 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1476 if (k->is_instance_klass()) {
1477 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1478 return (jbyteArray) JNIHandles::make_local(env, a);
1479 }
1480 }
1481 return NULL;
1482 JVM_END
1483
1484
1485 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1486 // some of this code was adapted from from jni_FromReflectedField
1487
1488 oop reflected = JNIHandles::resolve_non_null(field);
1489 oop mirror = java_lang_reflect_Field::clazz(reflected);
1490 Klass* k = java_lang_Class::as_Klass(mirror);
1491 int slot = java_lang_reflect_Field::slot(reflected);
1492 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1493
1494 InstanceKlass* ik = InstanceKlass::cast(k);
1495 intptr_t offset = ik->field_offset(slot);
1496
1497 if (modifiers & JVM_ACC_STATIC) {
1498 // for static fields we only look in the current class
1499 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1500 assert(false, "cannot find static field");
1501 return false;
1502 }
1503 } else {
1504 // for instance fields we start with the current class and work
1505 // our way up through the superclass chain
1506 if (!ik->find_field_from_offset(offset, false, &fd)) {
1507 assert(false, "cannot find instance field");
1508 return false;
1509 }
1510 }
1511 return true;
1512 }
1513
1514 static Method* jvm_get_method_common(jobject method) {
1515 // some of this code was adapted from from jni_FromReflectedMethod
1516
1517 oop reflected = JNIHandles::resolve_non_null(method);
1518 oop mirror = NULL;
1519 int slot = 0;
1520
1521 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1522 mirror = java_lang_reflect_Constructor::clazz(reflected);
1523 slot = java_lang_reflect_Constructor::slot(reflected);
1524 } else {
1525 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1526 "wrong type");
1527 mirror = java_lang_reflect_Method::clazz(reflected);
1528 slot = java_lang_reflect_Method::slot(reflected);
1529 }
1530 Klass* k = java_lang_Class::as_Klass(mirror);
1531
1532 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1533 assert(m != NULL, "cannot find method");
1534 return m; // caller has to deal with NULL in product mode
1535 }
1536
1537 /* Type use annotations support (JDK 1.8) */
1538
1539 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1540 assert (cls != NULL, "illegal class");
1541 JVMWrapper("JVM_GetClassTypeAnnotations");
1542 ResourceMark rm(THREAD);
1543 // Return null for arrays and primitives
1544 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1545 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1546 if (k->is_instance_klass()) {
1547 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1548 if (type_annotations != NULL) {
1549 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1550 return (jbyteArray) JNIHandles::make_local(env, a);
1551 }
1552 }
1553 }
1554 return NULL;
1555 JVM_END
1556
1557 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1558 assert (method != NULL, "illegal method");
1559 JVMWrapper("JVM_GetMethodTypeAnnotations");
1560
1561 // method is a handle to a java.lang.reflect.Method object
1562 Method* m = jvm_get_method_common(method);
1563 if (m == NULL) {
1564 return NULL;
1565 }
1566
1567 AnnotationArray* type_annotations = m->type_annotations();
1568 if (type_annotations != NULL) {
1569 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1570 return (jbyteArray) JNIHandles::make_local(env, a);
1571 }
1572
1573 return NULL;
1574 JVM_END
1575
1576 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1577 assert (field != NULL, "illegal field");
1578 JVMWrapper("JVM_GetFieldTypeAnnotations");
1579
1580 fieldDescriptor fd;
1581 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1582 if (!gotFd) {
1583 return NULL;
1584 }
1585
1586 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1587 JVM_END
1588
1589 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1590 if (!cp->is_within_bounds(index)) {
1591 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1592 }
1593 }
1594
1595 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1596 {
1597 JVMWrapper("JVM_GetMethodParameters");
1598 // method is a handle to a java.lang.reflect.Method object
1599 Method* method_ptr = jvm_get_method_common(method);
1600 methodHandle mh (THREAD, method_ptr);
1601 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1602 const int num_params = mh->method_parameters_length();
1603
1604 if (num_params < 0) {
1605 // A -1 return value from method_parameters_length means there is no
1606 // parameter data. Return null to indicate this to the reflection
1607 // API.
1608 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1609 return (jobjectArray)NULL;
1610 } else {
1611 // Otherwise, we return something up to reflection, even if it is
1612 // a zero-length array. Why? Because in some cases this can
1613 // trigger a MalformedParametersException.
1614
1615 // make sure all the symbols are properly formatted
1616 for (int i = 0; i < num_params; i++) {
1617 MethodParametersElement* params = mh->method_parameters_start();
1618 int index = params[i].name_cp_index;
1619 constantPoolHandle cp(THREAD, mh->constants());
1620 bounds_check(cp, index, CHECK_NULL);
1621
1622 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1623 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1624 "Wrong type at constant pool index");
1625 }
1626
1627 }
1628
1629 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1630 objArrayHandle result (THREAD, result_oop);
1631
1632 for (int i = 0; i < num_params; i++) {
1633 MethodParametersElement* params = mh->method_parameters_start();
1634 // For a 0 index, give a NULL symbol
1635 Symbol* sym = 0 != params[i].name_cp_index ?
1636 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1637 int flags = params[i].flags;
1638 oop param = Reflection::new_parameter(reflected_method, i, sym,
1639 flags, CHECK_NULL);
1640 result->obj_at_put(i, param);
1641 }
1642 return (jobjectArray)JNIHandles::make_local(env, result());
1643 }
1644 }
1645 JVM_END
1646
1647 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1648
1649 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1650 {
1651 JVMWrapper("JVM_GetClassDeclaredFields");
1652 JvmtiVMObjectAllocEventCollector oam;
1653
1654 // Exclude primitive types and array types
1655 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1656 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1657 // Return empty array
1658 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1659 return (jobjectArray) JNIHandles::make_local(env, res);
1660 }
1661
1662 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1663 constantPoolHandle cp(THREAD, k->constants());
1664
1665 // Ensure class is linked
1666 k->link_class(CHECK_NULL);
1667
1668 // Allocate result
1669 int num_fields;
1670
1671 if (publicOnly) {
1672 num_fields = 0;
1673 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1674 if (fs.access_flags().is_public()) ++num_fields;
1675 }
1676 } else {
1677 num_fields = k->java_fields_count();
1678 }
1679
1680 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1681 objArrayHandle result (THREAD, r);
1682
1683 int out_idx = 0;
1684 fieldDescriptor fd;
1685 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1686 if (!publicOnly || fs.access_flags().is_public()) {
1687 fd.reinitialize(k, fs.index());
1688 oop field = Reflection::new_field(&fd, CHECK_NULL);
1689 result->obj_at_put(out_idx, field);
1690 ++out_idx;
1691 }
1692 }
1693 assert(out_idx == num_fields, "just checking");
1694 return (jobjectArray) JNIHandles::make_local(env, result());
1695 }
1696 JVM_END
1697
1698 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1699 {
1700 JVMWrapper("JVM_IsRecord");
1701 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1702 if (k != NULL && k->is_instance_klass()) {
1703 InstanceKlass* ik = InstanceKlass::cast(k);
1704 return ik->is_record();
1705 } else {
1706 return false;
1707 }
1708 }
1709 JVM_END
1710
1711 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1712 {
1713 JVMWrapper("JVM_GetRecordComponents");
1714 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1715 assert(c->is_instance_klass(), "must be");
1716 InstanceKlass* ik = InstanceKlass::cast(c);
1717
1718 if (ik->is_record()) {
1719 Array<RecordComponent*>* components = ik->record_components();
1720 assert(components != NULL, "components should not be NULL");
1721 {
1722 JvmtiVMObjectAllocEventCollector oam;
1723 constantPoolHandle cp(THREAD, ik->constants());
1724 int length = components->length();
1725 assert(length >= 0, "unexpected record_components length");
1726 objArrayOop record_components =
1727 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL);
1728 objArrayHandle components_h (THREAD, record_components);
1729
1730 for (int x = 0; x < length; x++) {
1731 RecordComponent* component = components->at(x);
1732 assert(component != NULL, "unexpected NULL record component");
1733 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1734 components_h->obj_at_put(x, component_oop);
1735 }
1736 return (jobjectArray)JNIHandles::make_local(components_h());
1737 }
1738 }
1739
1740 // Return empty array if ofClass is not a record.
1741 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL);
1742 return (jobjectArray)JNIHandles::make_local(env, result);
1743 }
1744 JVM_END
1745
1746 static bool select_method(const methodHandle& method, bool want_constructor) {
1747 if (want_constructor) {
1748 return (method->is_initializer() && !method->is_static());
1749 } else {
1750 return (!method->is_initializer() && !method->is_overpass());
1751 }
1752 }
1753
1754 static jobjectArray get_class_declared_methods_helper(
1755 JNIEnv *env,
1756 jclass ofClass, jboolean publicOnly,
1757 bool want_constructor,
1758 Klass* klass, TRAPS) {
1759
1760 JvmtiVMObjectAllocEventCollector oam;
1761
1762 // Exclude primitive types and array types
1763 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1764 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1765 // Return empty array
1766 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1767 return (jobjectArray) JNIHandles::make_local(env, res);
1768 }
1769
1770 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1771
1772 // Ensure class is linked
1773 k->link_class(CHECK_NULL);
1774
1775 Array<Method*>* methods = k->methods();
1776 int methods_length = methods->length();
1777
1778 // Save original method_idnum in case of redefinition, which can change
1779 // the idnum of obsolete methods. The new method will have the same idnum
1780 // but if we refresh the methods array, the counts will be wrong.
1781 ResourceMark rm(THREAD);
1782 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1783 int num_methods = 0;
1784
1785 for (int i = 0; i < methods_length; i++) {
1786 methodHandle method(THREAD, methods->at(i));
1787 if (select_method(method, want_constructor)) {
1788 if (!publicOnly || method->is_public()) {
1789 idnums->push(method->method_idnum());
1790 ++num_methods;
1791 }
1792 }
1793 }
1794
1795 // Allocate result
1796 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1797 objArrayHandle result (THREAD, r);
1798
1799 // Now just put the methods that we selected above, but go by their idnum
1800 // in case of redefinition. The methods can be redefined at any safepoint,
1801 // so above when allocating the oop array and below when creating reflect
1802 // objects.
1803 for (int i = 0; i < num_methods; i++) {
1804 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1805 if (method.is_null()) {
1806 // Method may have been deleted and seems this API can handle null
1807 // Otherwise should probably put a method that throws NSME
1808 result->obj_at_put(i, NULL);
1809 } else {
1810 oop m;
1811 if (want_constructor) {
1812 m = Reflection::new_constructor(method, CHECK_NULL);
1813 } else {
1814 m = Reflection::new_method(method, false, CHECK_NULL);
1815 }
1816 result->obj_at_put(i, m);
1817 }
1818 }
1819
1820 return (jobjectArray) JNIHandles::make_local(env, result());
1821 }
1822
1823 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1824 {
1825 JVMWrapper("JVM_GetClassDeclaredMethods");
1826 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1827 /*want_constructor*/ false,
1828 SystemDictionary::reflect_Method_klass(), THREAD);
1829 }
1830 JVM_END
1831
1832 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1833 {
1834 JVMWrapper("JVM_GetClassDeclaredConstructors");
1835 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1836 /*want_constructor*/ true,
1837 SystemDictionary::reflect_Constructor_klass(), THREAD);
1838 }
1839 JVM_END
1840
1841 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1842 {
1843 JVMWrapper("JVM_GetClassAccessFlags");
1844 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1845 // Primitive type
1846 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1847 }
1848
1849 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1850 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1851 }
1852 JVM_END
1853
1854 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1855 {
1856 JVMWrapper("JVM_AreNestMates");
1857 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1858 assert(c->is_instance_klass(), "must be");
1859 InstanceKlass* ck = InstanceKlass::cast(c);
1860 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1861 assert(m->is_instance_klass(), "must be");
1862 InstanceKlass* mk = InstanceKlass::cast(m);
1863 return ck->has_nestmate_access_to(mk, THREAD);
1864 }
1865 JVM_END
1866
1867 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1868 {
1869 // current is not a primitive or array class
1870 JVMWrapper("JVM_GetNestHost");
1871 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1872 assert(c->is_instance_klass(), "must be");
1873 InstanceKlass* ck = InstanceKlass::cast(c);
1874 // Don't post exceptions if validation fails
1875 InstanceKlass* host = ck->nest_host(NULL, THREAD);
1876 return (jclass) (host == NULL ? NULL :
1877 JNIHandles::make_local(THREAD, host->java_mirror()));
1878 }
1879 JVM_END
1880
1881 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1882 {
1883 // current is not a primitive or array class
1884 JVMWrapper("JVM_GetNestMembers");
1885 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1886 assert(c->is_instance_klass(), "must be");
1887 InstanceKlass* ck = InstanceKlass::cast(c);
1888 // Get the nest host for this nest - throw ICCE if validation fails
1889 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
1890 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
1891
1892 {
1893 JvmtiVMObjectAllocEventCollector oam;
1894 Array<u2>* members = host->nest_members();
1895 int length = members == NULL ? 0 : members->length();
1896 // nest host is first in the array so make it one bigger
1897 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
1898 length + 1, CHECK_NULL);
1899 objArrayHandle result (THREAD, r);
1900 result->obj_at_put(0, host->java_mirror());
1901 if (length != 0) {
1902 int i;
1903 for (i = 0; i < length; i++) {
1904 int cp_index = members->at(i);
1905 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
1906 if (k->is_instance_klass()) {
1907 InstanceKlass* nest_host_k =
1908 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
1909 if (nest_host_k == host) {
1910 result->obj_at_put(i+1, k->java_mirror());
1911 }
1912 else {
1913 // k's nest host is legal but it isn't our host so
1914 // throw ICCE
1915 ResourceMark rm(THREAD);
1916 Exceptions::fthrow(THREAD_AND_LOCATION,
1917 icce,
1918 "Nest member %s in %s declares a different nest host of %s",
1919 k->external_name(),
1920 host->external_name(),
1921 nest_host_k->external_name()
1922 );
1923 return NULL;
1924 }
1925 }
1926 else {
1927 // we have a bad nest member entry - throw ICCE
1928 ResourceMark rm(THREAD);
1929 Exceptions::fthrow(THREAD_AND_LOCATION,
1930 icce,
1931 "Class %s can not be a nest member of %s",
1932 k->external_name(),
1933 host->external_name()
1934 );
1935 return NULL;
1936 }
1937 }
1938 }
1939 else {
1940 assert(host == ck, "must be singleton nest");
1941 }
1942 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1943 }
1944 }
1945 JVM_END
1946
1947 // Constant pool access //////////////////////////////////////////////////////////
1948
1949 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1950 {
1951 JVMWrapper("JVM_GetClassConstantPool");
1952 JvmtiVMObjectAllocEventCollector oam;
1953
1954 // Return null for primitives and arrays
1955 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1956 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1957 if (k->is_instance_klass()) {
1958 InstanceKlass* k_h = InstanceKlass::cast(k);
1959 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1960 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1961 return JNIHandles::make_local(jcp());
1962 }
1963 }
1964 return NULL;
1965 }
1966 JVM_END
1967
1968
1969 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1970 {
1971 JVMWrapper("JVM_ConstantPoolGetSize");
1972 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1973 return cp->length();
1974 }
1975 JVM_END
1976
1977
1978 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1979 {
1980 JVMWrapper("JVM_ConstantPoolGetClassAt");
1981 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1982 bounds_check(cp, index, CHECK_NULL);
1983 constantTag tag = cp->tag_at(index);
1984 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1985 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1986 }
1987 Klass* k = cp->klass_at(index, CHECK_NULL);
1988 return (jclass) JNIHandles::make_local(k->java_mirror());
1989 }
1990 JVM_END
1991
1992 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1993 {
1994 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1995 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1996 bounds_check(cp, index, CHECK_NULL);
1997 constantTag tag = cp->tag_at(index);
1998 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1999 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2000 }
2001 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2002 if (k == NULL) return NULL;
2003 return (jclass) JNIHandles::make_local(k->java_mirror());
2004 }
2005 JVM_END
2006
2007 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2008 constantTag tag = cp->tag_at(index);
2009 if (!tag.is_method() && !tag.is_interface_method()) {
2010 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2011 }
2012 int klass_ref = cp->uncached_klass_ref_index_at(index);
2013 Klass* k_o;
2014 if (force_resolution) {
2015 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2016 } else {
2017 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2018 if (k_o == NULL) return NULL;
2019 }
2020 InstanceKlass* k = InstanceKlass::cast(k_o);
2021 Symbol* name = cp->uncached_name_ref_at(index);
2022 Symbol* sig = cp->uncached_signature_ref_at(index);
2023 methodHandle m (THREAD, k->find_method(name, sig));
2024 if (m.is_null()) {
2025 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2026 }
2027 oop method;
2028 if (!m->is_initializer() || m->is_static()) {
2029 method = Reflection::new_method(m, true, CHECK_NULL);
2030 } else {
2031 method = Reflection::new_constructor(m, CHECK_NULL);
2032 }
2033 return JNIHandles::make_local(method);
2034 }
2035
2036 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2037 {
2038 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2039 JvmtiVMObjectAllocEventCollector oam;
2040 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2041 bounds_check(cp, index, CHECK_NULL);
2042 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2043 return res;
2044 }
2045 JVM_END
2046
2047 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2048 {
2049 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2050 JvmtiVMObjectAllocEventCollector oam;
2051 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2052 bounds_check(cp, index, CHECK_NULL);
2053 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2054 return res;
2055 }
2056 JVM_END
2057
2058 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2059 constantTag tag = cp->tag_at(index);
2060 if (!tag.is_field()) {
2061 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2062 }
2063 int klass_ref = cp->uncached_klass_ref_index_at(index);
2064 Klass* k_o;
2065 if (force_resolution) {
2066 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2067 } else {
2068 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2069 if (k_o == NULL) return NULL;
2070 }
2071 InstanceKlass* k = InstanceKlass::cast(k_o);
2072 Symbol* name = cp->uncached_name_ref_at(index);
2073 Symbol* sig = cp->uncached_signature_ref_at(index);
2074 fieldDescriptor fd;
2075 Klass* target_klass = k->find_field(name, sig, &fd);
2076 if (target_klass == NULL) {
2077 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2078 }
2079 oop field = Reflection::new_field(&fd, CHECK_NULL);
2080 return JNIHandles::make_local(field);
2081 }
2082
2083 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2084 {
2085 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2086 JvmtiVMObjectAllocEventCollector oam;
2087 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2088 bounds_check(cp, index, CHECK_NULL);
2089 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2090 return res;
2091 }
2092 JVM_END
2093
2094 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2095 {
2096 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2097 JvmtiVMObjectAllocEventCollector oam;
2098 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2099 bounds_check(cp, index, CHECK_NULL);
2100 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2101 return res;
2102 }
2103 JVM_END
2104
2105 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2106 {
2107 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2108 JvmtiVMObjectAllocEventCollector oam;
2109 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2110 bounds_check(cp, index, CHECK_NULL);
2111 constantTag tag = cp->tag_at(index);
2112 if (!tag.is_field_or_method()) {
2113 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2114 }
2115 int klass_ref = cp->uncached_klass_ref_index_at(index);
2116 Symbol* klass_name = cp->klass_name_at(klass_ref);
2117 Symbol* member_name = cp->uncached_name_ref_at(index);
2118 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2119 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2120 objArrayHandle dest(THREAD, dest_o);
2121 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2122 dest->obj_at_put(0, str());
2123 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2124 dest->obj_at_put(1, str());
2125 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2126 dest->obj_at_put(2, str());
2127 return (jobjectArray) JNIHandles::make_local(dest());
2128 }
2129 JVM_END
2130
2131 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2132 {
2133 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2134 JvmtiVMObjectAllocEventCollector oam;
2135 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2136 bounds_check(cp, index, CHECK_0);
2137 constantTag tag = cp->tag_at(index);
2138 if (!tag.is_field_or_method()) {
2139 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2140 }
2141 return (jint) cp->uncached_klass_ref_index_at(index);
2142 }
2143 JVM_END
2144
2145 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2146 {
2147 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2148 JvmtiVMObjectAllocEventCollector oam;
2149 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2150 bounds_check(cp, index, CHECK_0);
2151 constantTag tag = cp->tag_at(index);
2152 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2153 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2154 }
2155 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2156 }
2157 JVM_END
2158
2159 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2160 {
2161 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2162 JvmtiVMObjectAllocEventCollector oam;
2163 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2164 bounds_check(cp, index, CHECK_NULL);
2165 constantTag tag = cp->tag_at(index);
2166 if (!tag.is_name_and_type()) {
2167 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2168 }
2169 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2170 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2171 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2172 objArrayHandle dest(THREAD, dest_o);
2173 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2174 dest->obj_at_put(0, str());
2175 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2176 dest->obj_at_put(1, str());
2177 return (jobjectArray) JNIHandles::make_local(dest());
2178 }
2179 JVM_END
2180
2181 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2182 {
2183 JVMWrapper("JVM_ConstantPoolGetIntAt");
2184 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2185 bounds_check(cp, index, CHECK_0);
2186 constantTag tag = cp->tag_at(index);
2187 if (!tag.is_int()) {
2188 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2189 }
2190 return cp->int_at(index);
2191 }
2192 JVM_END
2193
2194 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2195 {
2196 JVMWrapper("JVM_ConstantPoolGetLongAt");
2197 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2198 bounds_check(cp, index, CHECK_(0L));
2199 constantTag tag = cp->tag_at(index);
2200 if (!tag.is_long()) {
2201 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2202 }
2203 return cp->long_at(index);
2204 }
2205 JVM_END
2206
2207 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2208 {
2209 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2210 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2211 bounds_check(cp, index, CHECK_(0.0f));
2212 constantTag tag = cp->tag_at(index);
2213 if (!tag.is_float()) {
2214 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2215 }
2216 return cp->float_at(index);
2217 }
2218 JVM_END
2219
2220 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2221 {
2222 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2223 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2224 bounds_check(cp, index, CHECK_(0.0));
2225 constantTag tag = cp->tag_at(index);
2226 if (!tag.is_double()) {
2227 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2228 }
2229 return cp->double_at(index);
2230 }
2231 JVM_END
2232
2233 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2234 {
2235 JVMWrapper("JVM_ConstantPoolGetStringAt");
2236 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2237 bounds_check(cp, index, CHECK_NULL);
2238 constantTag tag = cp->tag_at(index);
2239 if (!tag.is_string()) {
2240 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2241 }
2242 oop str = cp->string_at(index, CHECK_NULL);
2243 return (jstring) JNIHandles::make_local(str);
2244 }
2245 JVM_END
2246
2247 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2248 {
2249 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2250 JvmtiVMObjectAllocEventCollector oam;
2251 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2252 bounds_check(cp, index, CHECK_NULL);
2253 constantTag tag = cp->tag_at(index);
2254 if (!tag.is_symbol()) {
2255 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2256 }
2257 Symbol* sym = cp->symbol_at(index);
2258 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2259 return (jstring) JNIHandles::make_local(str());
2260 }
2261 JVM_END
2262
2263 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2264 {
2265 JVMWrapper("JVM_ConstantPoolGetTagAt");
2266 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2267 bounds_check(cp, index, CHECK_0);
2268 constantTag tag = cp->tag_at(index);
2269 jbyte result = tag.value();
2270 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2271 // they are changed to the corresponding tags from the JVM spec, so that java code in
2272 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2273 if (tag.is_klass_or_reference()) {
2274 result = JVM_CONSTANT_Class;
2275 } else if (tag.is_string_index()) {
2276 result = JVM_CONSTANT_String;
2277 } else if (tag.is_method_type_in_error()) {
2278 result = JVM_CONSTANT_MethodType;
2279 } else if (tag.is_method_handle_in_error()) {
2280 result = JVM_CONSTANT_MethodHandle;
2281 } else if (tag.is_dynamic_constant_in_error()) {
2282 result = JVM_CONSTANT_Dynamic;
2283 }
2284 return result;
2285 }
2286 JVM_END
2287
2288 // Assertion support. //////////////////////////////////////////////////////////
2289
2290 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2291 JVMWrapper("JVM_DesiredAssertionStatus");
2292 assert(cls != NULL, "bad class");
2293
2294 oop r = JNIHandles::resolve(cls);
2295 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2296 if (java_lang_Class::is_primitive(r)) return false;
2297
2298 Klass* k = java_lang_Class::as_Klass(r);
2299 assert(k->is_instance_klass(), "must be an instance klass");
2300 if (!k->is_instance_klass()) return false;
2301
2302 ResourceMark rm(THREAD);
2303 const char* name = k->name()->as_C_string();
2304 bool system_class = k->class_loader() == NULL;
2305 return JavaAssertions::enabled(name, system_class);
2306
2307 JVM_END
2308
2309
2310 // Return a new AssertionStatusDirectives object with the fields filled in with
2311 // command-line assertion arguments (i.e., -ea, -da).
2312 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2313 JVMWrapper("JVM_AssertionStatusDirectives");
2314 JvmtiVMObjectAllocEventCollector oam;
2315 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2316 return JNIHandles::make_local(env, asd);
2317 JVM_END
2318
2319 // Verification ////////////////////////////////////////////////////////////////////////////////
2320
2321 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2322
2323 // RedefineClasses support: bug 6214132 caused verification to fail.
2324 // All functions from this section should call the jvmtiThreadSate function:
2325 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2326 // The function returns a Klass* of the _scratch_class if the verifier
2327 // was invoked in the middle of the class redefinition.
2328 // Otherwise it returns its argument value which is the _the_class Klass*.
2329 // Please, refer to the description in the jvmtiThreadSate.hpp.
2330
2331 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2332 JVMWrapper("JVM_GetClassNameUTF");
2333 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2334 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2335 return k->name()->as_utf8();
2336 JVM_END
2337
2338
2339 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2340 JVMWrapper("JVM_GetClassCPTypes");
2341 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2342 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2343 // types will have length zero if this is not an InstanceKlass
2344 // (length is determined by call to JVM_GetClassCPEntriesCount)
2345 if (k->is_instance_klass()) {
2346 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2347 for (int index = cp->length() - 1; index >= 0; index--) {
2348 constantTag tag = cp->tag_at(index);
2349 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2350 }
2351 }
2352 JVM_END
2353
2354
2355 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2356 JVMWrapper("JVM_GetClassCPEntriesCount");
2357 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2358 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2359 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2360 JVM_END
2361
2362
2363 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2364 JVMWrapper("JVM_GetClassFieldsCount");
2365 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2366 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2367 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2368 JVM_END
2369
2370
2371 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2372 JVMWrapper("JVM_GetClassMethodsCount");
2373 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2374 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2375 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2376 JVM_END
2377
2378
2379 // The following methods, used for the verifier, are never called with
2380 // array klasses, so a direct cast to InstanceKlass is safe.
2381 // Typically, these methods are called in a loop with bounds determined
2382 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2383 // zero for arrays.
2384 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2385 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
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 int length = method->checked_exceptions_length();
2390 if (length > 0) {
2391 CheckedExceptionElement* table= method->checked_exceptions_start();
2392 for (int i = 0; i < length; i++) {
2393 exceptions[i] = table[i].class_cp_index;
2394 }
2395 }
2396 JVM_END
2397
2398
2399 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2400 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2401 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2402 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2403 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2404 return method->checked_exceptions_length();
2405 JVM_END
2406
2407
2408 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2409 JVMWrapper("JVM_GetMethodIxByteCode");
2410 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2411 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2412 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2413 memcpy(code, method->code_base(), method->code_size());
2414 JVM_END
2415
2416
2417 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2418 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2419 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2420 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2421 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2422 return method->code_size();
2423 JVM_END
2424
2425
2426 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2427 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2428 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2429 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2430 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2431 ExceptionTable extable(method);
2432 entry->start_pc = extable.start_pc(entry_index);
2433 entry->end_pc = extable.end_pc(entry_index);
2434 entry->handler_pc = extable.handler_pc(entry_index);
2435 entry->catchType = extable.catch_type_index(entry_index);
2436 JVM_END
2437
2438
2439 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2440 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2441 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2442 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2443 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2444 return method->exception_table_length();
2445 JVM_END
2446
2447
2448 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2449 JVMWrapper("JVM_GetMethodIxModifiers");
2450 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2451 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2452 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2453 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2454 JVM_END
2455
2456
2457 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2458 JVMWrapper("JVM_GetFieldIxModifiers");
2459 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2460 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2461 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2462 JVM_END
2463
2464
2465 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2466 JVMWrapper("JVM_GetMethodIxLocalsCount");
2467 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2468 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2469 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2470 return method->max_locals();
2471 JVM_END
2472
2473
2474 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2475 JVMWrapper("JVM_GetMethodIxArgsSize");
2476 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2477 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2478 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2479 return method->size_of_parameters();
2480 JVM_END
2481
2482
2483 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2484 JVMWrapper("JVM_GetMethodIxMaxStack");
2485 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2486 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2487 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2488 return method->verifier_max_stack();
2489 JVM_END
2490
2491
2492 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2493 JVMWrapper("JVM_IsConstructorIx");
2494 ResourceMark rm(THREAD);
2495 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2496 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2497 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2498 return method->name() == vmSymbols::object_initializer_name();
2499 JVM_END
2500
2501
2502 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2503 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2504 ResourceMark rm(THREAD);
2505 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2506 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2507 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2508 return method->is_overpass();
2509 JVM_END
2510
2511 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2512 JVMWrapper("JVM_GetMethodIxIxUTF");
2513 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2514 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2515 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2516 return method->name()->as_utf8();
2517 JVM_END
2518
2519
2520 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2521 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2522 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2523 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2524 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2525 return method->signature()->as_utf8();
2526 JVM_END
2527
2528 /**
2529 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2530 * read entries in the constant pool. Since the old verifier always
2531 * works on a copy of the code, it will not see any rewriting that
2532 * may possibly occur in the middle of verification. So it is important
2533 * that nothing it calls tries to use the cpCache instead of the raw
2534 * constant pool, so we must use cp->uncached_x methods when appropriate.
2535 */
2536 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2537 JVMWrapper("JVM_GetCPFieldNameUTF");
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_Fieldref:
2543 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2544 default:
2545 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2546 }
2547 ShouldNotReachHere();
2548 return NULL;
2549 JVM_END
2550
2551
2552 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2553 JVMWrapper("JVM_GetCPMethodNameUTF");
2554 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2555 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2556 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2557 switch (cp->tag_at(cp_index).value()) {
2558 case JVM_CONSTANT_InterfaceMethodref:
2559 case JVM_CONSTANT_Methodref:
2560 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2561 default:
2562 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2563 }
2564 ShouldNotReachHere();
2565 return NULL;
2566 JVM_END
2567
2568
2569 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2570 JVMWrapper("JVM_GetCPMethodSignatureUTF");
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 switch (cp->tag_at(cp_index).value()) {
2575 case JVM_CONSTANT_InterfaceMethodref:
2576 case JVM_CONSTANT_Methodref:
2577 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2578 default:
2579 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2580 }
2581 ShouldNotReachHere();
2582 return NULL;
2583 JVM_END
2584
2585
2586 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2587 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2588 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2589 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2590 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2591 switch (cp->tag_at(cp_index).value()) {
2592 case JVM_CONSTANT_Fieldref:
2593 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2594 default:
2595 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2596 }
2597 ShouldNotReachHere();
2598 return NULL;
2599 JVM_END
2600
2601
2602 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2603 JVMWrapper("JVM_GetCPClassNameUTF");
2604 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2605 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2606 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2607 Symbol* classname = cp->klass_name_at(cp_index);
2608 return classname->as_utf8();
2609 JVM_END
2610
2611
2612 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2613 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2614 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2615 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2616 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2617 switch (cp->tag_at(cp_index).value()) {
2618 case JVM_CONSTANT_Fieldref: {
2619 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2620 Symbol* classname = cp->klass_name_at(class_index);
2621 return classname->as_utf8();
2622 }
2623 default:
2624 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2625 }
2626 ShouldNotReachHere();
2627 return NULL;
2628 JVM_END
2629
2630
2631 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2632 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2633 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2634 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2635 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2636 switch (cp->tag_at(cp_index).value()) {
2637 case JVM_CONSTANT_Methodref:
2638 case JVM_CONSTANT_InterfaceMethodref: {
2639 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2640 Symbol* classname = cp->klass_name_at(class_index);
2641 return classname->as_utf8();
2642 }
2643 default:
2644 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2645 }
2646 ShouldNotReachHere();
2647 return NULL;
2648 JVM_END
2649
2650
2651 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2652 JVMWrapper("JVM_GetCPFieldModifiers");
2653 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2654 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2655 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2656 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2657 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2658 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2659 switch (cp->tag_at(cp_index).value()) {
2660 case JVM_CONSTANT_Fieldref: {
2661 Symbol* name = cp->uncached_name_ref_at(cp_index);
2662 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2663 InstanceKlass* ik = InstanceKlass::cast(k_called);
2664 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2665 if (fs.name() == name && fs.signature() == signature) {
2666 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2667 }
2668 }
2669 return -1;
2670 }
2671 default:
2672 fatal("JVM_GetCPFieldModifiers: illegal constant");
2673 }
2674 ShouldNotReachHere();
2675 return 0;
2676 JVM_END
2677
2678
2679 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2680 JVMWrapper("JVM_GetCPMethodModifiers");
2681 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2682 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2683 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2684 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2685 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2686 switch (cp->tag_at(cp_index).value()) {
2687 case JVM_CONSTANT_Methodref:
2688 case JVM_CONSTANT_InterfaceMethodref: {
2689 Symbol* name = cp->uncached_name_ref_at(cp_index);
2690 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2691 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2692 int methods_count = methods->length();
2693 for (int i = 0; i < methods_count; i++) {
2694 Method* method = methods->at(i);
2695 if (method->name() == name && method->signature() == signature) {
2696 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2697 }
2698 }
2699 return -1;
2700 }
2701 default:
2702 fatal("JVM_GetCPMethodModifiers: illegal constant");
2703 }
2704 ShouldNotReachHere();
2705 return 0;
2706 JVM_END
2707
2708
2709 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2710
2711 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2712 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2713 JVM_END
2714
2715
2716 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2717 JVMWrapper("JVM_IsSameClassPackage");
2718 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2719 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2720 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2721 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2722 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2723 JVM_END
2724
2725 // Printing support //////////////////////////////////////////////////
2726 extern "C" {
2727
2728 ATTRIBUTE_PRINTF(3, 0)
2729 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2730 // Reject count values that are negative signed values converted to
2731 // unsigned; see bug 4399518, 4417214
2732 if ((intptr_t)count <= 0) return -1;
2733
2734 int result = os::vsnprintf(str, count, fmt, args);
2735 if (result > 0 && (size_t)result >= count) {
2736 result = -1;
2737 }
2738
2739 return result;
2740 }
2741
2742 ATTRIBUTE_PRINTF(3, 4)
2743 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2744 va_list args;
2745 int len;
2746 va_start(args, fmt);
2747 len = jio_vsnprintf(str, count, fmt, args);
2748 va_end(args);
2749 return len;
2750 }
2751
2752 ATTRIBUTE_PRINTF(2, 3)
2753 int jio_fprintf(FILE* f, const char *fmt, ...) {
2754 int len;
2755 va_list args;
2756 va_start(args, fmt);
2757 len = jio_vfprintf(f, fmt, args);
2758 va_end(args);
2759 return len;
2760 }
2761
2762 ATTRIBUTE_PRINTF(2, 0)
2763 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2764 if (Arguments::vfprintf_hook() != NULL) {
2765 return Arguments::vfprintf_hook()(f, fmt, args);
2766 } else {
2767 return vfprintf(f, fmt, args);
2768 }
2769 }
2770
2771 ATTRIBUTE_PRINTF(1, 2)
2772 JNIEXPORT int jio_printf(const char *fmt, ...) {
2773 int len;
2774 va_list args;
2775 va_start(args, fmt);
2776 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2777 va_end(args);
2778 return len;
2779 }
2780
2781 // HotSpot specific jio method
2782 void jio_print(const char* s, size_t len) {
2783 // Try to make this function as atomic as possible.
2784 if (Arguments::vfprintf_hook() != NULL) {
2785 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2786 } else {
2787 // Make an unused local variable to avoid warning from gcc compiler.
2788 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2789 }
2790 }
2791
2792 } // Extern C
2793
2794 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2795
2796 // In most of the JVM thread support functions we need to access the
2797 // thread through a ThreadsListHandle to prevent it from exiting and
2798 // being reclaimed while we try to operate on it. The exceptions to this
2799 // rule are when operating on the current thread, or if the monitor of
2800 // the target java.lang.Thread is locked at the Java level - in both
2801 // cases the target cannot exit.
2802
2803 static void thread_entry(JavaThread* thread, TRAPS) {
2804 HandleMark hm(THREAD);
2805 Handle obj(THREAD, thread->threadObj());
2806 JavaValue result(T_VOID);
2807 JavaCalls::call_virtual(&result,
2808 obj,
2809 SystemDictionary::Thread_klass(),
2810 vmSymbols::run_method_name(),
2811 vmSymbols::void_method_signature(),
2812 THREAD);
2813 }
2814
2815
2816 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2817 JVMWrapper("JVM_StartThread");
2818 JavaThread *native_thread = NULL;
2819
2820 // We cannot hold the Threads_lock when we throw an exception,
2821 // due to rank ordering issues. Example: we might need to grab the
2822 // Heap_lock while we construct the exception.
2823 bool throw_illegal_thread_state = false;
2824
2825 // We must release the Threads_lock before we can post a jvmti event
2826 // in Thread::start.
2827 {
2828 // Ensure that the C++ Thread and OSThread structures aren't freed before
2829 // we operate.
2830 MutexLocker mu(Threads_lock);
2831
2832 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2833 // re-starting an already started thread, so we should usually find
2834 // that the JavaThread is null. However for a JNI attached thread
2835 // there is a small window between the Thread object being created
2836 // (with its JavaThread set) and the update to its threadStatus, so we
2837 // have to check for this
2838 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2839 throw_illegal_thread_state = true;
2840 } else {
2841 // We could also check the stillborn flag to see if this thread was already stopped, but
2842 // for historical reasons we let the thread detect that itself when it starts running
2843
2844 jlong size =
2845 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2846 // Allocate the C++ Thread structure and create the native thread. The
2847 // stack size retrieved from java is 64-bit signed, but the constructor takes
2848 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2849 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2850 // - Avoid passing negative values which would result in really large stacks.
2851 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2852 size_t sz = size > 0 ? (size_t) size : 0;
2853 native_thread = new JavaThread(&thread_entry, sz);
2854
2855 // At this point it may be possible that no osthread was created for the
2856 // JavaThread due to lack of memory. Check for this situation and throw
2857 // an exception if necessary. Eventually we may want to change this so
2858 // that we only grab the lock if the thread was created successfully -
2859 // then we can also do this check and throw the exception in the
2860 // JavaThread constructor.
2861 if (native_thread->osthread() != NULL) {
2862 // Note: the current thread is not being used within "prepare".
2863 native_thread->prepare(jthread);
2864 }
2865 }
2866 }
2867
2868 if (throw_illegal_thread_state) {
2869 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2870 }
2871
2872 assert(native_thread != NULL, "Starting null thread?");
2873
2874 if (native_thread->osthread() == NULL) {
2875 // No one should hold a reference to the 'native_thread'.
2876 native_thread->smr_delete();
2877 if (JvmtiExport::should_post_resource_exhausted()) {
2878 JvmtiExport::post_resource_exhausted(
2879 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2880 os::native_thread_creation_failed_msg());
2881 }
2882 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2883 os::native_thread_creation_failed_msg());
2884 }
2885
2886 #if INCLUDE_JFR
2887 if (JfrRecorder::is_recording() && EventThreadStart::is_enabled() &&
2888 EventThreadStart::is_stacktrace_enabled()) {
2889 JfrThreadLocal* tl = native_thread->jfr_thread_local();
2890 // skip Thread.start() and Thread.start0()
2891 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2));
2892 }
2893 #endif
2894
2895 Thread::start(native_thread);
2896
2897 JVM_END
2898
2899
2900 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2901 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2902 // but is thought to be reliable and simple. In the case, where the receiver is the
2903 // same thread as the sender, no VM_Operation is needed.
2904 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2905 JVMWrapper("JVM_StopThread");
2906
2907 // A nested ThreadsListHandle will grab the Threads_lock so create
2908 // tlh before we resolve throwable.
2909 ThreadsListHandle tlh(thread);
2910 oop java_throwable = JNIHandles::resolve(throwable);
2911 if (java_throwable == NULL) {
2912 THROW(vmSymbols::java_lang_NullPointerException());
2913 }
2914 oop java_thread = NULL;
2915 JavaThread* receiver = NULL;
2916 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2917 Events::log_exception(thread,
2918 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2919 p2i(receiver), p2i(java_thread), p2i(throwable));
2920
2921 if (is_alive) {
2922 // jthread refers to a live JavaThread.
2923 if (thread == receiver) {
2924 // Exception is getting thrown at self so no VM_Operation needed.
2925 THROW_OOP(java_throwable);
2926 } else {
2927 // Use a VM_Operation to throw the exception.
2928 Thread::send_async_exception(java_thread, java_throwable);
2929 }
2930 } else {
2931 // Either:
2932 // - target thread has not been started before being stopped, or
2933 // - target thread already terminated
2934 // We could read the threadStatus to determine which case it is
2935 // but that is overkill as it doesn't matter. We must set the
2936 // stillborn flag for the first case, and if the thread has already
2937 // exited setting this flag has no effect.
2938 java_lang_Thread::set_stillborn(java_thread);
2939 }
2940 JVM_END
2941
2942
2943 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2944 JVMWrapper("JVM_IsThreadAlive");
2945
2946 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2947 return java_lang_Thread::is_alive(thread_oop);
2948 JVM_END
2949
2950
2951 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2952 JVMWrapper("JVM_SuspendThread");
2953
2954 ThreadsListHandle tlh(thread);
2955 JavaThread* receiver = NULL;
2956 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2957 if (is_alive) {
2958 // jthread refers to a live JavaThread.
2959 {
2960 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2961 if (receiver->is_external_suspend()) {
2962 // Don't allow nested external suspend requests. We can't return
2963 // an error from this interface so just ignore the problem.
2964 return;
2965 }
2966 if (receiver->is_exiting()) { // thread is in the process of exiting
2967 return;
2968 }
2969 receiver->set_external_suspend();
2970 }
2971
2972 // java_suspend() will catch threads in the process of exiting
2973 // and will ignore them.
2974 receiver->java_suspend();
2975
2976 // It would be nice to have the following assertion in all the
2977 // time, but it is possible for a racing resume request to have
2978 // resumed this thread right after we suspended it. Temporarily
2979 // enable this assertion if you are chasing a different kind of
2980 // bug.
2981 //
2982 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2983 // receiver->is_being_ext_suspended(), "thread is not suspended");
2984 }
2985 JVM_END
2986
2987
2988 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2989 JVMWrapper("JVM_ResumeThread");
2990
2991 ThreadsListHandle tlh(thread);
2992 JavaThread* receiver = NULL;
2993 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2994 if (is_alive) {
2995 // jthread refers to a live JavaThread.
2996
2997 // This is the original comment for this Threads_lock grab:
2998 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2999 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3000 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3001 // looks at it.
3002 //
3003 // The above comment dates back to when we had both internal and
3004 // external suspend APIs that shared a common underlying mechanism.
3005 // External suspend is now entirely cooperative and doesn't share
3006 // anything with internal suspend. That said, there are some
3007 // assumptions in the VM that an external resume grabs the
3008 // Threads_lock. We can't drop the Threads_lock grab here until we
3009 // resolve the assumptions that exist elsewhere.
3010 //
3011 MutexLocker ml(Threads_lock);
3012 receiver->java_resume();
3013 }
3014 JVM_END
3015
3016
3017 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3018 JVMWrapper("JVM_SetThreadPriority");
3019
3020 ThreadsListHandle tlh(thread);
3021 oop java_thread = NULL;
3022 JavaThread* receiver = NULL;
3023 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3024 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3025
3026 if (is_alive) {
3027 // jthread refers to a live JavaThread.
3028 Thread::set_priority(receiver, (ThreadPriority)prio);
3029 }
3030 // Implied else: If the JavaThread hasn't started yet, then the
3031 // priority set in the java.lang.Thread object above will be pushed
3032 // down when it does start.
3033 JVM_END
3034
3035
3036 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3037 JVMWrapper("JVM_Yield");
3038 if (os::dont_yield()) return;
3039 HOTSPOT_THREAD_YIELD();
3040 os::naked_yield();
3041 JVM_END
3042
3043 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3044 assert(event != NULL, "invariant");
3045 assert(event->should_commit(), "invariant");
3046 event->set_time(millis);
3047 event->commit();
3048 }
3049
3050 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3051 JVMWrapper("JVM_Sleep");
3052
3053 if (millis < 0) {
3054 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3055 }
3056
3057 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3058 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3059 }
3060
3061 // Save current thread state and restore it at the end of this block.
3062 // And set new thread state to SLEEPING.
3063 JavaThreadSleepState jtss(thread);
3064
3065 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3066 EventThreadSleep event;
3067
3068 if (millis == 0) {
3069 os::naked_yield();
3070 } else {
3071 ThreadState old_state = thread->osthread()->get_state();
3072 thread->osthread()->set_state(SLEEPING);
3073 if (!thread->sleep(millis)) { // interrupted
3074 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3075 // us while we were sleeping. We do not overwrite those.
3076 if (!HAS_PENDING_EXCEPTION) {
3077 if (event.should_commit()) {
3078 post_thread_sleep_event(&event, millis);
3079 }
3080 HOTSPOT_THREAD_SLEEP_END(1);
3081
3082 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3083 // to properly restore the thread state. That's likely wrong.
3084 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3085 }
3086 }
3087 thread->osthread()->set_state(old_state);
3088 }
3089 if (event.should_commit()) {
3090 post_thread_sleep_event(&event, millis);
3091 }
3092 HOTSPOT_THREAD_SLEEP_END(0);
3093 JVM_END
3094
3095 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3096 JVMWrapper("JVM_CurrentThread");
3097 oop jthread = thread->threadObj();
3098 assert (thread != NULL, "no current thread!");
3099 return JNIHandles::make_local(env, jthread);
3100 JVM_END
3101
3102 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3103 JVMWrapper("JVM_Interrupt");
3104
3105 ThreadsListHandle tlh(thread);
3106 JavaThread* receiver = NULL;
3107 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3108 if (is_alive) {
3109 // jthread refers to a live JavaThread.
3110 receiver->interrupt();
3111 }
3112 JVM_END
3113
3114
3115 // Return true iff the current thread has locked the object passed in
3116
3117 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3118 JVMWrapper("JVM_HoldsLock");
3119 assert(THREAD->is_Java_thread(), "sanity check");
3120 if (obj == NULL) {
3121 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3122 }
3123 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3124 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3125 JVM_END
3126
3127
3128 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3129 JVMWrapper("JVM_DumpAllStacks");
3130 VM_PrintThreads op;
3131 VMThread::execute(&op);
3132 if (JvmtiExport::should_post_data_dump()) {
3133 JvmtiExport::post_data_dump();
3134 }
3135 JVM_END
3136
3137 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3138 JVMWrapper("JVM_SetNativeThreadName");
3139
3140 // We don't use a ThreadsListHandle here because the current thread
3141 // must be alive.
3142 oop java_thread = JNIHandles::resolve_non_null(jthread);
3143 JavaThread* thr = java_lang_Thread::thread(java_thread);
3144 if (thread == thr && !thr->has_attached_via_jni()) {
3145 // Thread naming is only supported for the current thread and
3146 // we don't set the name of an attached thread to avoid stepping
3147 // on other programs.
3148 ResourceMark rm(thread);
3149 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3150 os::set_native_thread_name(thread_name);
3151 }
3152 JVM_END
3153
3154 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3155
3156 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3157 JVMWrapper("JVM_GetClassContext");
3158 ResourceMark rm(THREAD);
3159 JvmtiVMObjectAllocEventCollector oam;
3160 vframeStream vfst(thread);
3161
3162 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3163 // This must only be called from SecurityManager.getClassContext
3164 Method* m = vfst.method();
3165 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3166 m->name() == vmSymbols::getClassContext_name() &&
3167 m->signature() == vmSymbols::void_class_array_signature())) {
3168 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3169 }
3170 }
3171
3172 // Collect method holders
3173 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3174 for (; !vfst.at_end(); vfst.security_next()) {
3175 Method* m = vfst.method();
3176 // Native frames are not returned
3177 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3178 Klass* holder = m->method_holder();
3179 assert(holder->is_klass(), "just checking");
3180 klass_array->append(holder);
3181 }
3182 }
3183
3184 // Create result array of type [Ljava/lang/Class;
3185 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3186 // Fill in mirrors corresponding to method holders
3187 for (int i = 0; i < klass_array->length(); i++) {
3188 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3189 }
3190
3191 return (jobjectArray) JNIHandles::make_local(env, result);
3192 JVM_END
3193
3194
3195 // java.lang.Package ////////////////////////////////////////////////////////////////
3196
3197
3198 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3199 JVMWrapper("JVM_GetSystemPackage");
3200 ResourceMark rm(THREAD);
3201 JvmtiVMObjectAllocEventCollector oam;
3202 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3203 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3204 return (jstring) JNIHandles::make_local(result);
3205 JVM_END
3206
3207
3208 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3209 JVMWrapper("JVM_GetSystemPackages");
3210 JvmtiVMObjectAllocEventCollector oam;
3211 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3212 return (jobjectArray) JNIHandles::make_local(result);
3213 JVM_END
3214
3215
3216 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3217
3218
3219 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3220 JVMWrapper("JVM_GetAndClearReferencePendingList");
3221
3222 MonitorLocker ml(Heap_lock);
3223 oop ref = Universe::reference_pending_list();
3224 if (ref != NULL) {
3225 Universe::set_reference_pending_list(NULL);
3226 }
3227 return JNIHandles::make_local(env, ref);
3228 JVM_END
3229
3230 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3231 JVMWrapper("JVM_HasReferencePendingList");
3232 MonitorLocker ml(Heap_lock);
3233 return Universe::has_reference_pending_list();
3234 JVM_END
3235
3236 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3237 JVMWrapper("JVM_WaitForReferencePendingList");
3238 MonitorLocker ml(Heap_lock);
3239 while (!Universe::has_reference_pending_list()) {
3240 ml.wait();
3241 }
3242 JVM_END
3243
3244
3245 // ObjectInputStream ///////////////////////////////////////////////////////////////
3246
3247 // Return the first user-defined class loader up the execution stack, or null
3248 // if only code from the bootstrap or platform class loader is on the stack.
3249
3250 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3251 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3252 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3253 oop loader = vfst.method()->method_holder()->class_loader();
3254 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3255 return JNIHandles::make_local(env, loader);
3256 }
3257 }
3258 return NULL;
3259 JVM_END
3260
3261
3262 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3263
3264
3265 // resolve array handle and check arguments
3266 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3267 if (arr == NULL) {
3268 THROW_0(vmSymbols::java_lang_NullPointerException());
3269 }
3270 oop a = JNIHandles::resolve_non_null(arr);
3271 if (!a->is_array()) {
3272 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3273 } else if (type_array_only && !a->is_typeArray()) {
3274 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3275 }
3276 return arrayOop(a);
3277 }
3278
3279
3280 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3281 JVMWrapper("JVM_GetArrayLength");
3282 arrayOop a = check_array(env, arr, false, CHECK_0);
3283 return a->length();
3284 JVM_END
3285
3286
3287 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3288 JVMWrapper("JVM_Array_Get");
3289 JvmtiVMObjectAllocEventCollector oam;
3290 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3291 jvalue value;
3292 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3293 oop box = Reflection::box(&value, type, CHECK_NULL);
3294 return JNIHandles::make_local(env, box);
3295 JVM_END
3296
3297
3298 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3299 JVMWrapper("JVM_GetPrimitiveArrayElement");
3300 jvalue value;
3301 value.i = 0; // to initialize value before getting used in CHECK
3302 arrayOop a = check_array(env, arr, true, CHECK_(value));
3303 assert(a->is_typeArray(), "just checking");
3304 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3305 BasicType wide_type = (BasicType) wCode;
3306 if (type != wide_type) {
3307 Reflection::widen(&value, type, wide_type, CHECK_(value));
3308 }
3309 return value;
3310 JVM_END
3311
3312
3313 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3314 JVMWrapper("JVM_SetArrayElement");
3315 arrayOop a = check_array(env, arr, false, CHECK);
3316 oop box = JNIHandles::resolve(val);
3317 jvalue value;
3318 value.i = 0; // to initialize value before getting used in CHECK
3319 BasicType value_type;
3320 if (a->is_objArray()) {
3321 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3322 value_type = Reflection::unbox_for_regular_object(box, &value);
3323 } else {
3324 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3325 }
3326 Reflection::array_set(&value, a, index, value_type, CHECK);
3327 JVM_END
3328
3329
3330 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3331 JVMWrapper("JVM_SetPrimitiveArrayElement");
3332 arrayOop a = check_array(env, arr, true, CHECK);
3333 assert(a->is_typeArray(), "just checking");
3334 BasicType value_type = (BasicType) vCode;
3335 Reflection::array_set(&v, a, index, value_type, CHECK);
3336 JVM_END
3337
3338
3339 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3340 JVMWrapper("JVM_NewArray");
3341 JvmtiVMObjectAllocEventCollector oam;
3342 oop element_mirror = JNIHandles::resolve(eltClass);
3343 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3344 return JNIHandles::make_local(env, result);
3345 JVM_END
3346
3347
3348 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3349 JVMWrapper("JVM_NewMultiArray");
3350 JvmtiVMObjectAllocEventCollector oam;
3351 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3352 oop element_mirror = JNIHandles::resolve(eltClass);
3353 assert(dim_array->is_typeArray(), "just checking");
3354 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3355 return JNIHandles::make_local(env, result);
3356 JVM_END
3357
3358
3359 // Library support ///////////////////////////////////////////////////////////////////////////
3360
3361 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3362 //%note jvm_ct
3363 JVMWrapper("JVM_LoadLibrary");
3364 char ebuf[1024];
3365 void *load_result;
3366 {
3367 ThreadToNativeFromVM ttnfvm(thread);
3368 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3369 }
3370 if (load_result == NULL) {
3371 char msg[1024];
3372 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3373 // Since 'ebuf' may contain a string encoded using
3374 // platform encoding scheme, we need to pass
3375 // Exceptions::unsafe_to_utf8 to the new_exception method
3376 // as the last argument. See bug 6367357.
3377 Handle h_exception =
3378 Exceptions::new_exception(thread,
3379 vmSymbols::java_lang_UnsatisfiedLinkError(),
3380 msg, Exceptions::unsafe_to_utf8);
3381
3382 THROW_HANDLE_0(h_exception);
3383 }
3384 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3385 return load_result;
3386 JVM_END
3387
3388
3389 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3390 JVMWrapper("JVM_UnloadLibrary");
3391 os::dll_unload(handle);
3392 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3393 JVM_END
3394
3395
3396 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3397 JVMWrapper("JVM_FindLibraryEntry");
3398 void* find_result = os::dll_lookup(handle, name);
3399 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3400 find_result != NULL ? "Found" : "Failed to find",
3401 name, p2i(handle));
3402 return find_result;
3403 JVM_END
3404
3405
3406 // JNI version ///////////////////////////////////////////////////////////////////////////////
3407
3408 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3409 JVMWrapper("JVM_IsSupportedJNIVersion");
3410 return Threads::is_supported_jni_version_including_1_1(version);
3411 JVM_END
3412
3413
3414 // String support ///////////////////////////////////////////////////////////////////////////
3415
3416 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3417 JVMWrapper("JVM_InternString");
3418 JvmtiVMObjectAllocEventCollector oam;
3419 if (str == NULL) return NULL;
3420 oop string = JNIHandles::resolve_non_null(str);
3421 oop result = StringTable::intern(string, CHECK_NULL);
3422 return (jstring) JNIHandles::make_local(env, result);
3423 JVM_END
3424
3425
3426 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3427
3428 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3429 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3430 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3431 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3432 // nature. JavaThreads will be "in native" when using this API from JDK code.
3433
3434
3435 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3436 VM_Exit::block_if_vm_exited();
3437 JVMWrapper("JVM_RawMonitorCreate");
3438 return new os::PlatformMutex();
3439 }
3440
3441
3442 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3443 VM_Exit::block_if_vm_exited();
3444 JVMWrapper("JVM_RawMonitorDestroy");
3445 delete ((os::PlatformMutex*) mon);
3446 }
3447
3448
3449 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3450 VM_Exit::block_if_vm_exited();
3451 JVMWrapper("JVM_RawMonitorEnter");
3452 ((os::PlatformMutex*) mon)->lock();
3453 return 0;
3454 }
3455
3456
3457 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3458 VM_Exit::block_if_vm_exited();
3459 JVMWrapper("JVM_RawMonitorExit");
3460 ((os::PlatformMutex*) mon)->unlock();
3461 }
3462
3463
3464 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3465
3466 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3467 Handle loader, Handle protection_domain,
3468 jboolean throwError, TRAPS) {
3469 // Security Note:
3470 // The Java level wrapper will perform the necessary security check allowing
3471 // us to pass the NULL as the initiating class loader. The VM is responsible for
3472 // the checkPackageAccess relative to the initiating class loader via the
3473 // protection_domain. The protection_domain is passed as NULL by the java code
3474 // if there is no security manager in 3-arg Class.forName().
3475 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3476
3477 // Check if we should initialize the class
3478 if (init && klass->is_instance_klass()) {
3479 klass->initialize(CHECK_NULL);
3480 }
3481 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3482 }
3483
3484
3485 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3486
3487 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3488 JVMWrapper("JVM_InvokeMethod");
3489 Handle method_handle;
3490 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3491 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3492 Handle receiver(THREAD, JNIHandles::resolve(obj));
3493 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3494 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3495 jobject res = JNIHandles::make_local(env, result);
3496 if (JvmtiExport::should_post_vm_object_alloc()) {
3497 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3498 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3499 if (java_lang_Class::is_primitive(ret_type)) {
3500 // Only for primitive type vm allocates memory for java object.
3501 // See box() method.
3502 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3503 }
3504 }
3505 return res;
3506 } else {
3507 THROW_0(vmSymbols::java_lang_StackOverflowError());
3508 }
3509 JVM_END
3510
3511
3512 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3513 JVMWrapper("JVM_NewInstanceFromConstructor");
3514 oop constructor_mirror = JNIHandles::resolve(c);
3515 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3516 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3517 jobject res = JNIHandles::make_local(env, result);
3518 if (JvmtiExport::should_post_vm_object_alloc()) {
3519 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3520 }
3521 return res;
3522 JVM_END
3523
3524 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3525
3526 JVM_LEAF(jboolean, JVM_SupportsCX8())
3527 JVMWrapper("JVM_SupportsCX8");
3528 return VM_Version::supports_cx8();
3529 JVM_END
3530
3531 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3532 JVMWrapper("JVM_InitializeFromArchive");
3533 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3534 assert(k->is_klass(), "just checking");
3535 HeapShared::initialize_from_archived_subgraph(k);
3536 JVM_END
3537
3538 // Returns an array of all live Thread objects (VM internal JavaThreads,
3539 // jvmti agent threads, and JNI attaching threads are skipped)
3540 // See CR 6404306 regarding JNI attaching threads
3541 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3542 ResourceMark rm(THREAD);
3543 ThreadsListEnumerator tle(THREAD, false, false);
3544 JvmtiVMObjectAllocEventCollector oam;
3545
3546 int num_threads = tle.num_threads();
3547 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3548 objArrayHandle threads_ah(THREAD, r);
3549
3550 for (int i = 0; i < num_threads; i++) {
3551 Handle h = tle.get_threadObj(i);
3552 threads_ah->obj_at_put(i, h());
3553 }
3554
3555 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3556 JVM_END
3557
3558
3559 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3560 // Return StackTraceElement[][], each element is the stack trace of a thread in
3561 // the corresponding entry in the given threads array
3562 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3563 JVMWrapper("JVM_DumpThreads");
3564 JvmtiVMObjectAllocEventCollector oam;
3565
3566 // Check if threads is null
3567 if (threads == NULL) {
3568 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3569 }
3570
3571 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3572 objArrayHandle ah(THREAD, a);
3573 int num_threads = ah->length();
3574 // check if threads is non-empty array
3575 if (num_threads == 0) {
3576 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3577 }
3578
3579 // check if threads is not an array of objects of Thread class
3580 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3581 if (k != SystemDictionary::Thread_klass()) {
3582 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3583 }
3584
3585 ResourceMark rm(THREAD);
3586
3587 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3588 for (int i = 0; i < num_threads; i++) {
3589 oop thread_obj = ah->obj_at(i);
3590 instanceHandle h(THREAD, (instanceOop) thread_obj);
3591 thread_handle_array->append(h);
3592 }
3593
3594 // The JavaThread references in thread_handle_array are validated
3595 // in VM_ThreadDump::doit().
3596 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3597 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3598
3599 JVM_END
3600
3601 // JVM monitoring and management support
3602 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3603 return Management::get_jmm_interface(version);
3604 JVM_END
3605
3606 // com.sun.tools.attach.VirtualMachine agent properties support
3607 //
3608 // Initialize the agent properties with the properties maintained in the VM
3609 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3610 JVMWrapper("JVM_InitAgentProperties");
3611 ResourceMark rm;
3612
3613 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3614
3615 PUTPROP(props, "sun.java.command", Arguments::java_command());
3616 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3617 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3618 return properties;
3619 JVM_END
3620
3621 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3622 {
3623 JVMWrapper("JVM_GetEnclosingMethodInfo");
3624 JvmtiVMObjectAllocEventCollector oam;
3625
3626 if (ofClass == NULL) {
3627 return NULL;
3628 }
3629 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3630 // Special handling for primitive objects
3631 if (java_lang_Class::is_primitive(mirror())) {
3632 return NULL;
3633 }
3634 Klass* k = java_lang_Class::as_Klass(mirror());
3635 if (!k->is_instance_klass()) {
3636 return NULL;
3637 }
3638 InstanceKlass* ik = InstanceKlass::cast(k);
3639 int encl_method_class_idx = ik->enclosing_method_class_index();
3640 if (encl_method_class_idx == 0) {
3641 return NULL;
3642 }
3643 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3644 objArrayHandle dest(THREAD, dest_o);
3645 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3646 dest->obj_at_put(0, enc_k->java_mirror());
3647 int encl_method_method_idx = ik->enclosing_method_method_index();
3648 if (encl_method_method_idx != 0) {
3649 Symbol* sym = ik->constants()->symbol_at(
3650 extract_low_short_from_int(
3651 ik->constants()->name_and_type_at(encl_method_method_idx)));
3652 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3653 dest->obj_at_put(1, str());
3654 sym = ik->constants()->symbol_at(
3655 extract_high_short_from_int(
3656 ik->constants()->name_and_type_at(encl_method_method_idx)));
3657 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3658 dest->obj_at_put(2, str());
3659 }
3660 return (jobjectArray) JNIHandles::make_local(dest());
3661 }
3662 JVM_END
3663
3664 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3665 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3666 ResourceMark rm(THREAD);
3667
3668 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3669 return NULL;
3670 }
3671
3672 char** vm_flags = Arguments::jvm_flags_array();
3673 char** vm_args = Arguments::jvm_args_array();
3674 int num_flags = Arguments::num_jvm_flags();
3675 int num_args = Arguments::num_jvm_args();
3676
3677 InstanceKlass* ik = SystemDictionary::String_klass();
3678 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3679 objArrayHandle result_h(THREAD, r);
3680
3681 int index = 0;
3682 for (int j = 0; j < num_flags; j++, index++) {
3683 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3684 result_h->obj_at_put(index, h());
3685 }
3686 for (int i = 0; i < num_args; i++, index++) {
3687 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3688 result_h->obj_at_put(index, h());
3689 }
3690 return (jobjectArray) JNIHandles::make_local(env, result_h());
3691 JVM_END
3692
3693 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3694 return os::get_signal_number(name);
3695 JVM_END