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 #if INCLUDE_TSAN
86 #include "tsan/tsan.hpp"
87 #endif // INCLUDE_TSAN
88 #include "utilities/copy.hpp"
89 #include "utilities/defaultStream.hpp"
90 #include "utilities/dtrace.hpp"
91 #include "utilities/events.hpp"
92 #include "utilities/histogram.hpp"
93 #include "utilities/macros.hpp"
94 #include "utilities/utf8.hpp"
95 #if INCLUDE_CDS
96 #include "classfile/systemDictionaryShared.hpp"
97 #endif
98
99 #include <errno.h>
100
101 /*
102 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
103 such ctors and calls MUST NOT come between an oop declaration/init and its
104 usage because if objects are move this may cause various memory stomps, bus
105 errors and segfaults. Here is a cookbook for causing so called "naked oop
106 failures":
107
108 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
109 JVMWrapper("JVM_GetClassDeclaredFields");
110
111 // Object address to be held directly in mirror & not visible to GC
112 oop mirror = JNIHandles::resolve_non_null(ofClass);
113
114 // If this ctor can hit a safepoint, moving objects around, then
115 ComplexConstructor foo;
116
117 // Boom! mirror may point to JUNK instead of the intended object
118 (some dereference of mirror)
119
120 // Here's another call that may block for GC, making mirror stale
121 MutexLocker ml(some_lock);
122
123 // And here's an initializer that can result in a stale oop
124 // all in one step.
125 oop o = call_that_can_throw_exception(TRAPS);
126
127
128 The solution is to keep the oop declaration BELOW the ctor or function
129 call that might cause a GC, do another resolve to reassign the oop, or
130 consider use of a Handle instead of an oop so there is immunity from object
131 motion. But note that the "QUICK" entries below do not have a handlemark
132 and thus can only support use of handles passed in.
133 */
134
135 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
136 ResourceMark rm;
137 int line_number = -1;
138 const char * source_file = NULL;
139 const char * trace = "explicit";
140 InstanceKlass* caller = NULL;
141 JavaThread* jthread = JavaThread::current();
142 if (jthread->has_last_Java_frame()) {
143 vframeStream vfst(jthread);
144
145 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
146 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
147 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
148 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
149 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
150
151 Method* last_caller = NULL;
152
153 while (!vfst.at_end()) {
154 Method* m = vfst.method();
155 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
156 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
157 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
158 break;
159 }
160 last_caller = m;
161 vfst.next();
162 }
163 // if this is called from Class.forName0 and that is called from Class.forName,
164 // then print the caller of Class.forName. If this is Class.loadClass, then print
165 // that caller, otherwise keep quiet since this should be picked up elsewhere.
166 bool found_it = false;
167 if (!vfst.at_end() &&
168 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
169 vfst.method()->name() == vmSymbols::forName0_name()) {
170 vfst.next();
171 if (!vfst.at_end() &&
172 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
173 vfst.method()->name() == vmSymbols::forName_name()) {
174 vfst.next();
175 found_it = true;
176 }
177 } else if (last_caller != NULL &&
178 last_caller->method_holder()->name() ==
179 vmSymbols::java_lang_ClassLoader() &&
180 last_caller->name() == vmSymbols::loadClass_name()) {
181 found_it = true;
182 } else if (!vfst.at_end()) {
183 if (vfst.method()->is_native()) {
184 // JNI call
185 found_it = true;
186 }
187 }
188 if (found_it && !vfst.at_end()) {
189 // found the caller
190 caller = vfst.method()->method_holder();
191 line_number = vfst.method()->line_number_from_bci(vfst.bci());
192 if (line_number == -1) {
193 // show method name if it's a native method
194 trace = vfst.method()->name_and_sig_as_C_string();
195 }
196 Symbol* s = caller->source_file_name();
197 if (s != NULL) {
198 source_file = s->as_C_string();
199 }
200 }
201 }
202 if (caller != NULL) {
203 if (to_class != caller) {
204 const char * from = caller->external_name();
205 const char * to = to_class->external_name();
206 // print in a single call to reduce interleaving between threads
207 if (source_file != NULL) {
208 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
209 } else {
210 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
211 }
212 }
213 }
214 }
215
216 void trace_class_resolution(Klass* to_class) {
217 EXCEPTION_MARK;
218 trace_class_resolution_impl(to_class, THREAD);
219 if (HAS_PENDING_EXCEPTION) {
220 CLEAR_PENDING_EXCEPTION;
221 }
222 }
223
224 // Wrapper to trace JVM functions
225
226 #ifdef ASSERT
227 Histogram* JVMHistogram;
228 volatile int JVMHistogram_lock = 0;
229
230 class JVMHistogramElement : public HistogramElement {
231 public:
232 JVMHistogramElement(const char* name);
233 };
234
235 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
236 _name = elementName;
237 uintx count = 0;
238
239 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) {
240 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) {
241 count +=1;
242 if ( (WarnOnStalledSpinLock > 0)
243 && (count % WarnOnStalledSpinLock == 0)) {
244 warning("JVMHistogram_lock seems to be stalled");
245 }
246 }
247 }
248
249 if(JVMHistogram == NULL)
250 JVMHistogram = new Histogram("JVM Call Counts",100);
251
252 JVMHistogram->add_element(this);
253 Atomic::dec(&JVMHistogram_lock);
254 }
255
256 #define JVMCountWrapper(arg) \
257 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
258 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
259
260 #define JVMWrapper(arg) JVMCountWrapper(arg);
261 #else
262 #define JVMWrapper(arg)
263 #endif
264
265
266 // Interface version /////////////////////////////////////////////////////////////////////
267
268
269 JVM_LEAF(jint, JVM_GetInterfaceVersion())
270 return JVM_INTERFACE_VERSION;
271 JVM_END
272
273
274 // java.lang.System //////////////////////////////////////////////////////////////////////
275
276
277 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
278 JVMWrapper("JVM_CurrentTimeMillis");
279 return os::javaTimeMillis();
280 JVM_END
281
282 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
283 JVMWrapper("JVM_NanoTime");
284 return os::javaTimeNanos();
285 JVM_END
286
287 // The function below is actually exposed by jdk.internal.misc.VM and not
288 // java.lang.System, but we choose to keep it here so that it stays next
289 // to JVM_CurrentTimeMillis and JVM_NanoTime
290
291 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
292 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
293
294 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
295 JVMWrapper("JVM_GetNanoTimeAdjustment");
296 jlong seconds;
297 jlong nanos;
298
299 os::javaTimeSystemUTC(seconds, nanos);
300
301 // We're going to verify that the result can fit in a long.
302 // For that we need the difference in seconds between 'seconds'
303 // and 'offset_secs' to be such that:
304 // |seconds - offset_secs| < (2^63/10^9)
305 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
306 // which makes |seconds - offset_secs| < 2^33
307 // and we will prefer +/- 2^32 as the maximum acceptable diff
308 // as 2^32 has a more natural feel than 2^33...
309 //
310 // So if |seconds - offset_secs| >= 2^32 - we return a special
311 // sentinel value (-1) which the caller should take as an
312 // exception value indicating that the offset given to us is
313 // too far from range of the current time - leading to too big
314 // a nano adjustment. The caller is expected to recover by
315 // computing a more accurate offset and calling this method
316 // again. (For the record 2^32 secs is ~136 years, so that
317 // should rarely happen)
318 //
319 jlong diff = seconds - offset_secs;
320 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
321 return -1; // sentinel value: the offset is too far off the target
322 }
323
324 // return the adjustment. If you compute a time by adding
325 // this number of nanoseconds along with the number of seconds
326 // in the offset you should get the current UTC time.
327 return (diff * (jlong)1000000000) + nanos;
328 JVM_END
329
330 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
331 jobject dst, jint dst_pos, jint length))
332 JVMWrapper("JVM_ArrayCopy");
333 // Check if we have null pointers
334 if (src == NULL || dst == NULL) {
335 THROW(vmSymbols::java_lang_NullPointerException());
336 }
337 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
338 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
339 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
340 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
341 // Do copy
342 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
343 JVM_END
344
345
346 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
347 JavaValue r(T_OBJECT);
348 // public synchronized Object put(Object key, Object value);
349 HandleMark hm(THREAD);
350 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
351 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
352 JavaCalls::call_virtual(&r,
353 props,
354 SystemDictionary::Properties_klass(),
355 vmSymbols::put_name(),
356 vmSymbols::object_object_object_signature(),
357 key_str,
358 value_str,
359 THREAD);
360 }
361
362
363 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
364
365 /*
366 * Return all of the system properties in a Java String array with alternating
367 * names and values from the jvm SystemProperty.
368 * Which includes some internal and all commandline -D defined properties.
369 */
370 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
371 JVMWrapper("JVM_GetProperties");
372 ResourceMark rm(THREAD);
373 HandleMark hm(THREAD);
374 int ndx = 0;
375 int fixedCount = 2;
376
377 SystemProperty* p = Arguments::system_properties();
378 int count = Arguments::PropertyList_count(p);
379
380 // Allocate result String array
381 InstanceKlass* ik = SystemDictionary::String_klass();
382 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
383 objArrayHandle result_h(THREAD, r);
384
385 while (p != NULL) {
386 const char * key = p->key();
387 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
388 const char * value = p->value();
389 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
390 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
391 result_h->obj_at_put(ndx * 2, key_str());
392 result_h->obj_at_put(ndx * 2 + 1, value_str());
393 ndx++;
394 }
395 p = p->next();
396 }
397
398 // Convert the -XX:MaxDirectMemorySize= command line flag
399 // to the sun.nio.MaxDirectMemorySize property.
400 // Do this after setting user properties to prevent people
401 // from setting the value with a -D option, as requested.
402 // Leave empty if not supplied
403 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
404 char as_chars[256];
405 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
406 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
407 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
408 result_h->obj_at_put(ndx * 2, key_str());
409 result_h->obj_at_put(ndx * 2 + 1, value_str());
410 ndx++;
411 }
412
413 // JVM monitoring and management support
414 // Add the sun.management.compiler property for the compiler's name
415 {
416 #undef CSIZE
417 #if defined(_LP64) || defined(_WIN64)
418 #define CSIZE "64-Bit "
419 #else
420 #define CSIZE
421 #endif // 64bit
422
423 #ifdef TIERED
424 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
425 #else
426 #if defined(COMPILER1)
427 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
428 #elif defined(COMPILER2)
429 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
430 #elif INCLUDE_JVMCI
431 #error "INCLUDE_JVMCI should imply TIERED"
432 #else
433 const char* compiler_name = "";
434 #endif // compilers
435 #endif // TIERED
436
437 if (*compiler_name != '\0' &&
438 (Arguments::mode() != Arguments::_int)) {
439 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
440 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
441 result_h->obj_at_put(ndx * 2, key_str());
442 result_h->obj_at_put(ndx * 2 + 1, value_str());
443 ndx++;
444 }
445 }
446
447 return (jobjectArray) JNIHandles::make_local(env, result_h());
448 JVM_END
449
450
451 /*
452 * Return the temporary directory that the VM uses for the attach
453 * and perf data files.
454 *
455 * It is important that this directory is well-known and the
456 * same for all VM instances. It cannot be affected by configuration
457 * variables such as java.io.tmpdir.
458 */
459 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
460 JVMWrapper("JVM_GetTemporaryDirectory");
461 HandleMark hm(THREAD);
462 const char* temp_dir = os::get_temp_directory();
463 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
464 return (jstring) JNIHandles::make_local(env, h());
465 JVM_END
466
467
468 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
469
470 extern volatile jint vm_created;
471
472 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
473 JVMWrapper("JVM_BeforeHalt");
474 EventShutdown event;
475 if (event.should_commit()) {
476 event.set_reason("Shutdown requested from Java");
477 event.commit();
478 }
479 JVM_END
480
481
482 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
483 before_exit(thread);
484 vm_exit(code);
485 JVM_END
486
487
488 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
489 JVMWrapper("JVM_GC");
490 if (!DisableExplicitGC) {
491 Universe::heap()->collect(GCCause::_java_lang_system_gc);
492 }
493 JVM_END
494
495
496 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
497 JVMWrapper("JVM_MaxObjectInspectionAge");
498 return Universe::heap()->millis_since_last_gc();
499 JVM_END
500
501
502 static inline jlong convert_size_t_to_jlong(size_t val) {
503 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
504 NOT_LP64 (return (jlong)val;)
505 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
506 }
507
508 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
509 JVMWrapper("JVM_TotalMemory");
510 size_t n = Universe::heap()->capacity();
511 return convert_size_t_to_jlong(n);
512 JVM_END
513
514
515 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
516 JVMWrapper("JVM_FreeMemory");
517 size_t n = Universe::heap()->unused();
518 return convert_size_t_to_jlong(n);
519 JVM_END
520
521
522 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
523 JVMWrapper("JVM_MaxMemory");
524 size_t n = Universe::heap()->max_capacity();
525 return convert_size_t_to_jlong(n);
526 JVM_END
527
528
529 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
530 JVMWrapper("JVM_ActiveProcessorCount");
531 return os::active_processor_count();
532 JVM_END
533
534
535
536 // java.lang.Throwable //////////////////////////////////////////////////////
537
538 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
539 JVMWrapper("JVM_FillInStackTrace");
540 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
541 java_lang_Throwable::fill_in_stack_trace(exception);
542 JVM_END
543
544 // java.lang.NullPointerException ///////////////////////////////////////////
545
546 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
547 if (!ShowCodeDetailsInExceptionMessages) return NULL;
548
549 oop exc = JNIHandles::resolve_non_null(throwable);
550
551 Method* method;
552 int bci;
553 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
554 return NULL;
555 }
556 if (method->is_native()) {
557 return NULL;
558 }
559
560 stringStream ss;
561 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
562 if (ok) {
563 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_0);
564 return (jstring) JNIHandles::make_local(env, result);
565 } else {
566 return NULL;
567 }
568 JVM_END
569
570 // java.lang.StackTraceElement //////////////////////////////////////////////
571
572
573 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
574 JVMWrapper("JVM_InitStackTraceElementArray");
575 Handle exception(THREAD, JNIHandles::resolve(throwable));
576 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
577 objArrayHandle stack_trace(THREAD, st);
578 // Fill in the allocated stack trace
579 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
580 JVM_END
581
582
583 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
584 JVMWrapper("JVM_InitStackTraceElement");
585 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
586 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
587 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
588 JVM_END
589
590
591 // java.lang.StackWalker //////////////////////////////////////////////////////
592
593
594 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
595 jint skip_frames, jint frame_count, jint start_index,
596 jobjectArray frames))
597 JVMWrapper("JVM_CallStackWalk");
598 JavaThread* jt = (JavaThread*) THREAD;
599 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
600 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
601 }
602
603 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
604
605 // frames array is a Class<?>[] array when only getting caller reference,
606 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
607 // be null.
608 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
609 objArrayHandle frames_array_h(THREAD, fa);
610
611 int limit = start_index + frame_count;
612 if (frames_array_h->length() < limit) {
613 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
614 }
615
616 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
617 start_index, frames_array_h, CHECK_NULL);
618 return JNIHandles::make_local(env, result);
619 JVM_END
620
621
622 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
623 jint frame_count, jint start_index,
624 jobjectArray frames))
625 JVMWrapper("JVM_MoreStackWalk");
626 JavaThread* jt = (JavaThread*) THREAD;
627
628 // frames array is a Class<?>[] array when only getting caller reference,
629 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
630 // be null.
631 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
632 objArrayHandle frames_array_h(THREAD, fa);
633
634 int limit = start_index+frame_count;
635 if (frames_array_h->length() < limit) {
636 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
637 }
638
639 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
640 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
641 start_index, frames_array_h, THREAD);
642 JVM_END
643
644 // java.lang.Object ///////////////////////////////////////////////
645
646
647 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
648 JVMWrapper("JVM_IHashCode");
649 // as implemented in the classic virtual machine; return 0 if object is NULL
650 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
651 JVM_END
652
653
654 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
655 JVMWrapper("JVM_MonitorWait");
656 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
657 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
658 if (JvmtiExport::should_post_monitor_wait()) {
659 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
660
661 // The current thread already owns the monitor and it has not yet
662 // been added to the wait queue so the current thread cannot be
663 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
664 // event handler cannot accidentally consume an unpark() meant for
665 // the ParkEvent associated with this ObjectMonitor.
666 }
667 ObjectSynchronizer::wait(obj, ms, CHECK);
668 JVM_END
669
670
671 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
672 JVMWrapper("JVM_MonitorNotify");
673 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
674 ObjectSynchronizer::notify(obj, CHECK);
675 JVM_END
676
677
678 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
679 JVMWrapper("JVM_MonitorNotifyAll");
680 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
681 ObjectSynchronizer::notifyall(obj, CHECK);
682 JVM_END
683
684
685 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
686 JVMWrapper("JVM_Clone");
687 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
688 Klass* klass = obj->klass();
689 JvmtiVMObjectAllocEventCollector oam;
690
691 #ifdef ASSERT
692 // Just checking that the cloneable flag is set correct
693 if (obj->is_array()) {
694 guarantee(klass->is_cloneable(), "all arrays are cloneable");
695 } else {
696 guarantee(obj->is_instance(), "should be instanceOop");
697 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
698 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
699 }
700 #endif
701
702 // Check if class of obj supports the Cloneable interface.
703 // All arrays are considered to be cloneable (See JLS 20.1.5).
704 // All j.l.r.Reference classes are considered non-cloneable.
705 if (!klass->is_cloneable() ||
706 (klass->is_instance_klass() &&
707 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
708 ResourceMark rm(THREAD);
709 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
710 }
711
712 // Make shallow object copy
713 const int size = obj->size();
714 oop new_obj_oop = NULL;
715 if (obj->is_array()) {
716 const int length = ((arrayOop)obj())->length();
717 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
718 /* do_zero */ true, CHECK_NULL);
719 } else {
720 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
721 }
722
723 HeapAccess<>::clone(obj(), new_obj_oop, size);
724
725 Handle new_obj(THREAD, new_obj_oop);
726 // Caution: this involves a java upcall, so the clone should be
727 // "gc-robust" by this stage.
728 if (klass->has_finalizer()) {
729 assert(obj->is_instance(), "should be instanceOop");
730 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
731 new_obj = Handle(THREAD, new_obj_oop);
732 }
733
734 return JNIHandles::make_local(env, new_obj());
735 JVM_END
736
737 // java.io.File ///////////////////////////////////////////////////////////////
738
739 JVM_LEAF(char*, JVM_NativePath(char* path))
740 JVMWrapper("JVM_NativePath");
741 return os::native_path(path);
742 JVM_END
743
744
745 // Misc. class handling ///////////////////////////////////////////////////////////
746
747
748 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
749 JVMWrapper("JVM_GetCallerClass");
750
751 // Getting the class of the caller frame.
752 //
753 // The call stack at this point looks something like this:
754 //
755 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
756 // [1] [ @CallerSensitive API.method ]
757 // [.] [ (skipped intermediate frames) ]
758 // [n] [ caller ]
759 vframeStream vfst(thread);
760 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
761 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
762 Method* m = vfst.method();
763 assert(m != NULL, "sanity");
764 switch (n) {
765 case 0:
766 // This must only be called from Reflection.getCallerClass
767 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
768 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
769 }
770 // fall-through
771 case 1:
772 // Frame 0 and 1 must be caller sensitive.
773 if (!m->caller_sensitive()) {
774 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
775 }
776 break;
777 default:
778 if (!m->is_ignored_by_security_stack_walk()) {
779 // We have reached the desired frame; return the holder class.
780 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
781 }
782 break;
783 }
784 }
785 return NULL;
786 JVM_END
787
788
789 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
790 JVMWrapper("JVM_FindPrimitiveClass");
791 oop mirror = NULL;
792 BasicType t = name2type(utf);
793 if (t != T_ILLEGAL && !is_reference_type(t)) {
794 mirror = Universe::java_mirror(t);
795 }
796 if (mirror == NULL) {
797 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
798 } else {
799 return (jclass) JNIHandles::make_local(env, mirror);
800 }
801 JVM_END
802
803
804 // Returns a class loaded by the bootstrap class loader; or null
805 // if not found. ClassNotFoundException is not thrown.
806 // FindClassFromBootLoader is exported to the launcher for windows.
807 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
808 const char* name))
809 JVMWrapper("JVM_FindClassFromBootLoader");
810
811 // Java libraries should ensure that name is never null...
812 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
813 // It's impossible to create this class; the name cannot fit
814 // into the constant pool.
815 return NULL;
816 }
817
818 TempNewSymbol h_name = SymbolTable::new_symbol(name);
819 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
820 if (k == NULL) {
821 return NULL;
822 }
823
824 if (log_is_enabled(Debug, class, resolve)) {
825 trace_class_resolution(k);
826 }
827 return (jclass) JNIHandles::make_local(env, k->java_mirror());
828 JVM_END
829
830 // Find a class with this name in this loader, using the caller's protection domain.
831 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
832 jboolean init, jobject loader,
833 jclass caller))
834 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
835 // Java libraries should ensure that name is never null...
836 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
837 // It's impossible to create this class; the name cannot fit
838 // into the constant pool.
839 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
840 }
841
842 TempNewSymbol h_name = SymbolTable::new_symbol(name);
843
844 oop loader_oop = JNIHandles::resolve(loader);
845 oop from_class = JNIHandles::resolve(caller);
846 oop protection_domain = NULL;
847 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
848 // NPE. Put it in another way, the bootstrap class loader has all permission and
849 // thus no checkPackageAccess equivalence in the VM class loader.
850 // The caller is also passed as NULL by the java code if there is no security
851 // manager to avoid the performance cost of getting the calling class.
852 if (from_class != NULL && loader_oop != NULL) {
853 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
854 }
855
856 Handle h_loader(THREAD, loader_oop);
857 Handle h_prot(THREAD, protection_domain);
858 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
859 h_prot, false, THREAD);
860
861 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
862 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
863 }
864 return result;
865 JVM_END
866
867 // Currently only called from the old verifier.
868 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
869 jboolean init, jclass from))
870 JVMWrapper("JVM_FindClassFromClass");
871 if (name == NULL) {
872 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
873 }
874 if ((int)strlen(name) > Symbol::max_length()) {
875 // It's impossible to create this class; the name cannot fit
876 // into the constant pool.
877 Exceptions::fthrow(THREAD_AND_LOCATION,
878 vmSymbols::java_lang_NoClassDefFoundError(),
879 "Class name exceeds maximum length of %d: %s",
880 Symbol::max_length(),
881 name);
882 return 0;
883 }
884 TempNewSymbol h_name = SymbolTable::new_symbol(name);
885 oop from_class_oop = JNIHandles::resolve(from);
886 Klass* from_class = (from_class_oop == NULL)
887 ? (Klass*)NULL
888 : java_lang_Class::as_Klass(from_class_oop);
889 oop class_loader = NULL;
890 oop protection_domain = NULL;
891 if (from_class != NULL) {
892 class_loader = from_class->class_loader();
893 protection_domain = from_class->protection_domain();
894 }
895 Handle h_loader(THREAD, class_loader);
896 Handle h_prot (THREAD, protection_domain);
897 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
898 h_prot, true, thread);
899
900 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
901 // this function is generally only used for class loading during verification.
902 ResourceMark rm;
903 oop from_mirror = JNIHandles::resolve_non_null(from);
904 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
905 const char * from_name = from_class->external_name();
906
907 oop mirror = JNIHandles::resolve_non_null(result);
908 Klass* to_class = java_lang_Class::as_Klass(mirror);
909 const char * to = to_class->external_name();
910 log_debug(class, resolve)("%s %s (verification)", from_name, to);
911 }
912
913 return result;
914 JVM_END
915
916 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
917 if (loader.is_null()) {
918 return;
919 }
920
921 // check whether the current caller thread holds the lock or not.
922 // If not, increment the corresponding counter
923 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
924 ObjectSynchronizer::owner_self) {
925 counter->inc();
926 }
927 }
928
929 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
930 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
931 jobject loader, const jbyte *buf,
932 jsize len, jobject pd, const char *source,
933 TRAPS) {
934 if (source == NULL) source = "__JVM_DefineClass__";
935
936 assert(THREAD->is_Java_thread(), "must be a JavaThread");
937 JavaThread* jt = (JavaThread*) THREAD;
938
939 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
940 ClassLoader::perf_define_appclass_selftime(),
941 ClassLoader::perf_define_appclasses(),
942 jt->get_thread_stat()->perf_recursion_counts_addr(),
943 jt->get_thread_stat()->perf_timers_addr(),
944 PerfClassTraceTime::DEFINE_CLASS);
945
946 if (UsePerfData) {
947 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
948 }
949
950 // Since exceptions can be thrown, class initialization can take place
951 // if name is NULL no check for class name in .class stream has to be made.
952 TempNewSymbol class_name = NULL;
953 if (name != NULL) {
954 const int str_len = (int)strlen(name);
955 if (str_len > Symbol::max_length()) {
956 // It's impossible to create this class; the name cannot fit
957 // into the constant pool.
958 Exceptions::fthrow(THREAD_AND_LOCATION,
959 vmSymbols::java_lang_NoClassDefFoundError(),
960 "Class name exceeds maximum length of %d: %s",
961 Symbol::max_length(),
962 name);
963 return 0;
964 }
965 class_name = SymbolTable::new_symbol(name, str_len);
966 }
967
968 ResourceMark rm(THREAD);
969 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
970 Handle class_loader (THREAD, JNIHandles::resolve(loader));
971 if (UsePerfData) {
972 is_lock_held_by_thread(class_loader,
973 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
974 THREAD);
975 }
976 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
977 Klass* k = SystemDictionary::resolve_from_stream(class_name,
978 class_loader,
979 protection_domain,
980 &st,
981 CHECK_NULL);
982
983 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
984 trace_class_resolution(k);
985 }
986
987 return (jclass) JNIHandles::make_local(env, k->java_mirror());
988 }
989
990
991 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
992 JVMWrapper("JVM_DefineClass");
993
994 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
995 JVM_END
996
997
998 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
999 JVMWrapper("JVM_DefineClassWithSource");
1000
1001 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
1002 JVM_END
1003
1004 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1005 JVMWrapper("JVM_FindLoadedClass");
1006 ResourceMark rm(THREAD);
1007
1008 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1009 char* str = java_lang_String::as_utf8_string(h_name());
1010
1011 // Sanity check, don't expect null
1012 if (str == NULL) return NULL;
1013
1014 // Internalize the string, converting '.' to '/' in string.
1015 char* p = (char*)str;
1016 while (*p != '\0') {
1017 if (*p == '.') {
1018 *p = '/';
1019 }
1020 p++;
1021 }
1022
1023 const int str_len = (int)(p - str);
1024 if (str_len > Symbol::max_length()) {
1025 // It's impossible to create this class; the name cannot fit
1026 // into the constant pool.
1027 return NULL;
1028 }
1029 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1030
1031 // Security Note:
1032 // The Java level wrapper will perform the necessary security check allowing
1033 // us to pass the NULL as the initiating class loader.
1034 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1035 if (UsePerfData) {
1036 is_lock_held_by_thread(h_loader,
1037 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1038 THREAD);
1039 }
1040
1041 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1042 h_loader,
1043 Handle(),
1044 CHECK_NULL);
1045 #if INCLUDE_CDS
1046 if (k == NULL) {
1047 // If the class is not already loaded, try to see if it's in the shared
1048 // archive for the current classloader (h_loader).
1049 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1050 }
1051 #endif
1052 return (k == NULL) ? NULL :
1053 (jclass) JNIHandles::make_local(env, k->java_mirror());
1054 JVM_END
1055
1056 // Module support //////////////////////////////////////////////////////////////////////////////
1057
1058 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1059 jstring location, const char* const* packages, jsize num_packages))
1060 JVMWrapper("JVM_DefineModule");
1061 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1062 JVM_END
1063
1064 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1065 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1066 Modules::set_bootloader_unnamed_module(module, CHECK);
1067 JVM_END
1068
1069 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1070 JVMWrapper("JVM_AddModuleExports");
1071 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1072 JVM_END
1073
1074 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1075 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1076 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1077 JVM_END
1078
1079 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1080 JVMWrapper("JVM_AddModuleExportsToAll");
1081 Modules::add_module_exports(from_module, package, NULL, CHECK);
1082 JVM_END
1083
1084 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1085 JVMWrapper("JVM_AddReadsModule");
1086 Modules::add_reads_module(from_module, source_module, CHECK);
1087 JVM_END
1088
1089 // Reflection support //////////////////////////////////////////////////////////////////////////////
1090
1091 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1092 assert (cls != NULL, "illegal class");
1093 JVMWrapper("JVM_InitClassName");
1094 JvmtiVMObjectAllocEventCollector oam;
1095 ResourceMark rm(THREAD);
1096 HandleMark hm(THREAD);
1097 Handle java_class(THREAD, JNIHandles::resolve(cls));
1098 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1099 return (jstring) JNIHandles::make_local(env, result);
1100 JVM_END
1101
1102
1103 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1104 JVMWrapper("JVM_GetClassInterfaces");
1105 JvmtiVMObjectAllocEventCollector oam;
1106 oop mirror = JNIHandles::resolve_non_null(cls);
1107
1108 // Special handling for primitive objects
1109 if (java_lang_Class::is_primitive(mirror)) {
1110 // Primitive objects does not have any interfaces
1111 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1112 return (jobjectArray) JNIHandles::make_local(env, r);
1113 }
1114
1115 Klass* klass = java_lang_Class::as_Klass(mirror);
1116 // Figure size of result array
1117 int size;
1118 if (klass->is_instance_klass()) {
1119 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1120 } else {
1121 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1122 size = 2;
1123 }
1124
1125 // Allocate result array
1126 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1127 objArrayHandle result (THREAD, r);
1128 // Fill in result
1129 if (klass->is_instance_klass()) {
1130 // Regular instance klass, fill in all local interfaces
1131 for (int index = 0; index < size; index++) {
1132 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1133 result->obj_at_put(index, k->java_mirror());
1134 }
1135 } else {
1136 // All arrays implement java.lang.Cloneable and java.io.Serializable
1137 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1138 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1139 }
1140 return (jobjectArray) JNIHandles::make_local(env, result());
1141 JVM_END
1142
1143
1144 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1145 JVMWrapper("JVM_IsInterface");
1146 oop mirror = JNIHandles::resolve_non_null(cls);
1147 if (java_lang_Class::is_primitive(mirror)) {
1148 return JNI_FALSE;
1149 }
1150 Klass* k = java_lang_Class::as_Klass(mirror);
1151 jboolean result = k->is_interface();
1152 assert(!result || k->is_instance_klass(),
1153 "all interfaces are instance types");
1154 // The compiler intrinsic for isInterface tests the
1155 // Klass::_access_flags bits in the same way.
1156 return result;
1157 JVM_END
1158
1159
1160 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1161 JVMWrapper("JVM_GetClassSigners");
1162 JvmtiVMObjectAllocEventCollector oam;
1163 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1164 // There are no signers for primitive types
1165 return NULL;
1166 }
1167
1168 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1169
1170 // If there are no signers set in the class, or if the class
1171 // is an array, return NULL.
1172 if (signers == NULL) return NULL;
1173
1174 // copy of the signers array
1175 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1176 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1177 for (int index = 0; index < signers->length(); index++) {
1178 signers_copy->obj_at_put(index, signers->obj_at(index));
1179 }
1180
1181 // return the copy
1182 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1183 JVM_END
1184
1185
1186 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1187 JVMWrapper("JVM_SetClassSigners");
1188 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1189 // This call is ignored for primitive types and arrays.
1190 // Signers are only set once, ClassLoader.java, and thus shouldn't
1191 // be called with an array. Only the bootstrap loader creates arrays.
1192 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1193 if (k->is_instance_klass()) {
1194 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1195 }
1196 }
1197 JVM_END
1198
1199
1200 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1201 JVMWrapper("JVM_GetProtectionDomain");
1202 if (JNIHandles::resolve(cls) == NULL) {
1203 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1204 }
1205
1206 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1207 // Primitive types does not have a protection domain.
1208 return NULL;
1209 }
1210
1211 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1212 return (jobject) JNIHandles::make_local(env, pd);
1213 JVM_END
1214
1215
1216 // Returns the inherited_access_control_context field of the running thread.
1217 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1218 JVMWrapper("JVM_GetInheritedAccessControlContext");
1219 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1220 return JNIHandles::make_local(env, result);
1221 JVM_END
1222
1223 class RegisterArrayForGC {
1224 private:
1225 JavaThread *_thread;
1226 public:
1227 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1228 _thread = thread;
1229 _thread->register_array_for_gc(array);
1230 }
1231
1232 ~RegisterArrayForGC() {
1233 _thread->register_array_for_gc(NULL);
1234 }
1235 };
1236
1237
1238 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1239 JVMWrapper("JVM_GetStackAccessControlContext");
1240 if (!UsePrivilegedStack) return NULL;
1241
1242 ResourceMark rm(THREAD);
1243 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1244 JvmtiVMObjectAllocEventCollector oam;
1245
1246 // count the protection domains on the execution stack. We collapse
1247 // duplicate consecutive protection domains into a single one, as
1248 // well as stopping when we hit a privileged frame.
1249
1250 oop previous_protection_domain = NULL;
1251 Handle privileged_context(thread, NULL);
1252 bool is_privileged = false;
1253 oop protection_domain = NULL;
1254
1255 // Iterate through Java frames
1256 vframeStream vfst(thread);
1257 for(; !vfst.at_end(); vfst.next()) {
1258 // get method of frame
1259 Method* method = vfst.method();
1260
1261 // stop at the first privileged frame
1262 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1263 method->name() == vmSymbols::executePrivileged_name())
1264 {
1265 // this frame is privileged
1266 is_privileged = true;
1267
1268 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1269
1270 StackValueCollection* locals = priv->locals();
1271 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1272 StackValue* clr_sv = locals->at(2); // Class<?> caller
1273 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1274 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1275 privileged_context = ctx_sv->get_obj();
1276 Handle caller = clr_sv->get_obj();
1277
1278 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1279 protection_domain = caller_klass->protection_domain();
1280 } else {
1281 protection_domain = method->method_holder()->protection_domain();
1282 }
1283
1284 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1285 local_array->push(protection_domain);
1286 previous_protection_domain = protection_domain;
1287 }
1288
1289 if (is_privileged) break;
1290 }
1291
1292
1293 // either all the domains on the stack were system domains, or
1294 // we had a privileged system domain
1295 if (local_array->is_empty()) {
1296 if (is_privileged && privileged_context.is_null()) return NULL;
1297
1298 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1299 return JNIHandles::make_local(env, result);
1300 }
1301
1302 // the resource area must be registered in case of a gc
1303 RegisterArrayForGC ragc(thread, local_array);
1304 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1305 local_array->length(), CHECK_NULL);
1306 objArrayHandle h_context(thread, context);
1307 for (int index = 0; index < local_array->length(); index++) {
1308 h_context->obj_at_put(index, local_array->at(index));
1309 }
1310
1311 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1312
1313 return JNIHandles::make_local(env, result);
1314 JVM_END
1315
1316
1317 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1318 JVMWrapper("JVM_IsArrayClass");
1319 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1320 return (k != NULL) && k->is_array_klass() ? true : false;
1321 JVM_END
1322
1323
1324 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1325 JVMWrapper("JVM_IsPrimitiveClass");
1326 oop mirror = JNIHandles::resolve_non_null(cls);
1327 return (jboolean) java_lang_Class::is_primitive(mirror);
1328 JVM_END
1329
1330
1331 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1332 JVMWrapper("JVM_GetClassModifiers");
1333 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1334 // Primitive type
1335 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1336 }
1337
1338 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1339 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1340 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1341 return k->modifier_flags();
1342 JVM_END
1343
1344
1345 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1346
1347 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1348 JvmtiVMObjectAllocEventCollector oam;
1349 // ofClass is a reference to a java_lang_Class object. The mirror object
1350 // of an InstanceKlass
1351
1352 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1353 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1354 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1355 return (jobjectArray)JNIHandles::make_local(env, result);
1356 }
1357
1358 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1359 InnerClassesIterator iter(k);
1360
1361 if (iter.length() == 0) {
1362 // Neither an inner nor outer class
1363 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1364 return (jobjectArray)JNIHandles::make_local(env, result);
1365 }
1366
1367 // find inner class info
1368 constantPoolHandle cp(thread, k->constants());
1369 int length = iter.length();
1370
1371 // Allocate temp. result array
1372 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1373 objArrayHandle result (THREAD, r);
1374 int members = 0;
1375
1376 for (; !iter.done(); iter.next()) {
1377 int ioff = iter.inner_class_info_index();
1378 int ooff = iter.outer_class_info_index();
1379
1380 if (ioff != 0 && ooff != 0) {
1381 // Check to see if the name matches the class we're looking for
1382 // before attempting to find the class.
1383 if (cp->klass_name_at_matches(k, ooff)) {
1384 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1385 if (outer_klass == k) {
1386 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1387 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1388
1389 // Throws an exception if outer klass has not declared k as
1390 // an inner klass
1391 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1392
1393 result->obj_at_put(members, inner_klass->java_mirror());
1394 members++;
1395 }
1396 }
1397 }
1398 }
1399
1400 if (members != length) {
1401 // Return array of right length
1402 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1403 for(int i = 0; i < members; i++) {
1404 res->obj_at_put(i, result->obj_at(i));
1405 }
1406 return (jobjectArray)JNIHandles::make_local(env, res);
1407 }
1408
1409 return (jobjectArray)JNIHandles::make_local(env, result());
1410 JVM_END
1411
1412
1413 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1414 {
1415 // ofClass is a reference to a java_lang_Class object.
1416 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1417 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1418 return NULL;
1419 }
1420
1421 bool inner_is_member = false;
1422 Klass* outer_klass
1423 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1424 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1425 if (outer_klass == NULL) return NULL; // already a top-level class
1426 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1427 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1428 }
1429 JVM_END
1430
1431 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1432 {
1433 oop mirror = JNIHandles::resolve_non_null(cls);
1434 if (java_lang_Class::is_primitive(mirror) ||
1435 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1436 return NULL;
1437 }
1438 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1439 int ooff = 0, noff = 0;
1440 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1441 if (noff != 0) {
1442 constantPoolHandle i_cp(thread, k->constants());
1443 Symbol* name = i_cp->symbol_at(noff);
1444 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1445 return (jstring) JNIHandles::make_local(env, str());
1446 }
1447 }
1448 return NULL;
1449 }
1450 JVM_END
1451
1452 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1453 assert (cls != NULL, "illegal class");
1454 JVMWrapper("JVM_GetClassSignature");
1455 JvmtiVMObjectAllocEventCollector oam;
1456 ResourceMark rm(THREAD);
1457 // Return null for arrays and primatives
1458 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1459 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1460 if (k->is_instance_klass()) {
1461 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1462 if (sym == NULL) return NULL;
1463 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1464 return (jstring) JNIHandles::make_local(env, str());
1465 }
1466 }
1467 return NULL;
1468 JVM_END
1469
1470
1471 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1472 assert (cls != NULL, "illegal class");
1473 JVMWrapper("JVM_GetClassAnnotations");
1474
1475 // Return null for arrays and primitives
1476 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1477 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1478 if (k->is_instance_klass()) {
1479 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1480 return (jbyteArray) JNIHandles::make_local(env, a);
1481 }
1482 }
1483 return NULL;
1484 JVM_END
1485
1486
1487 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1488 // some of this code was adapted from from jni_FromReflectedField
1489
1490 oop reflected = JNIHandles::resolve_non_null(field);
1491 oop mirror = java_lang_reflect_Field::clazz(reflected);
1492 Klass* k = java_lang_Class::as_Klass(mirror);
1493 int slot = java_lang_reflect_Field::slot(reflected);
1494 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1495
1496 InstanceKlass* ik = InstanceKlass::cast(k);
1497 intptr_t offset = ik->field_offset(slot);
1498
1499 if (modifiers & JVM_ACC_STATIC) {
1500 // for static fields we only look in the current class
1501 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1502 assert(false, "cannot find static field");
1503 return false;
1504 }
1505 } else {
1506 // for instance fields we start with the current class and work
1507 // our way up through the superclass chain
1508 if (!ik->find_field_from_offset(offset, false, &fd)) {
1509 assert(false, "cannot find instance field");
1510 return false;
1511 }
1512 }
1513 return true;
1514 }
1515
1516 static Method* jvm_get_method_common(jobject method) {
1517 // some of this code was adapted from from jni_FromReflectedMethod
1518
1519 oop reflected = JNIHandles::resolve_non_null(method);
1520 oop mirror = NULL;
1521 int slot = 0;
1522
1523 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1524 mirror = java_lang_reflect_Constructor::clazz(reflected);
1525 slot = java_lang_reflect_Constructor::slot(reflected);
1526 } else {
1527 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1528 "wrong type");
1529 mirror = java_lang_reflect_Method::clazz(reflected);
1530 slot = java_lang_reflect_Method::slot(reflected);
1531 }
1532 Klass* k = java_lang_Class::as_Klass(mirror);
1533
1534 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1535 assert(m != NULL, "cannot find method");
1536 return m; // caller has to deal with NULL in product mode
1537 }
1538
1539 /* Type use annotations support (JDK 1.8) */
1540
1541 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1542 assert (cls != NULL, "illegal class");
1543 JVMWrapper("JVM_GetClassTypeAnnotations");
1544 ResourceMark rm(THREAD);
1545 // Return null for arrays and primitives
1546 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1547 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1548 if (k->is_instance_klass()) {
1549 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1550 if (type_annotations != NULL) {
1551 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1552 return (jbyteArray) JNIHandles::make_local(env, a);
1553 }
1554 }
1555 }
1556 return NULL;
1557 JVM_END
1558
1559 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1560 assert (method != NULL, "illegal method");
1561 JVMWrapper("JVM_GetMethodTypeAnnotations");
1562
1563 // method is a handle to a java.lang.reflect.Method object
1564 Method* m = jvm_get_method_common(method);
1565 if (m == NULL) {
1566 return NULL;
1567 }
1568
1569 AnnotationArray* type_annotations = m->type_annotations();
1570 if (type_annotations != NULL) {
1571 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1572 return (jbyteArray) JNIHandles::make_local(env, a);
1573 }
1574
1575 return NULL;
1576 JVM_END
1577
1578 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1579 assert (field != NULL, "illegal field");
1580 JVMWrapper("JVM_GetFieldTypeAnnotations");
1581
1582 fieldDescriptor fd;
1583 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1584 if (!gotFd) {
1585 return NULL;
1586 }
1587
1588 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1589 JVM_END
1590
1591 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1592 if (!cp->is_within_bounds(index)) {
1593 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1594 }
1595 }
1596
1597 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1598 {
1599 JVMWrapper("JVM_GetMethodParameters");
1600 // method is a handle to a java.lang.reflect.Method object
1601 Method* method_ptr = jvm_get_method_common(method);
1602 methodHandle mh (THREAD, method_ptr);
1603 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1604 const int num_params = mh->method_parameters_length();
1605
1606 if (num_params < 0) {
1607 // A -1 return value from method_parameters_length means there is no
1608 // parameter data. Return null to indicate this to the reflection
1609 // API.
1610 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1611 return (jobjectArray)NULL;
1612 } else {
1613 // Otherwise, we return something up to reflection, even if it is
1614 // a zero-length array. Why? Because in some cases this can
1615 // trigger a MalformedParametersException.
1616
1617 // make sure all the symbols are properly formatted
1618 for (int i = 0; i < num_params; i++) {
1619 MethodParametersElement* params = mh->method_parameters_start();
1620 int index = params[i].name_cp_index;
1621 constantPoolHandle cp(THREAD, mh->constants());
1622 bounds_check(cp, index, CHECK_NULL);
1623
1624 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1625 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1626 "Wrong type at constant pool index");
1627 }
1628
1629 }
1630
1631 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1632 objArrayHandle result (THREAD, result_oop);
1633
1634 for (int i = 0; i < num_params; i++) {
1635 MethodParametersElement* params = mh->method_parameters_start();
1636 // For a 0 index, give a NULL symbol
1637 Symbol* sym = 0 != params[i].name_cp_index ?
1638 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1639 int flags = params[i].flags;
1640 oop param = Reflection::new_parameter(reflected_method, i, sym,
1641 flags, CHECK_NULL);
1642 result->obj_at_put(i, param);
1643 }
1644 return (jobjectArray)JNIHandles::make_local(env, result());
1645 }
1646 }
1647 JVM_END
1648
1649 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1650
1651 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1652 {
1653 JVMWrapper("JVM_GetClassDeclaredFields");
1654 JvmtiVMObjectAllocEventCollector oam;
1655
1656 // Exclude primitive types and array types
1657 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1658 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1659 // Return empty array
1660 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1661 return (jobjectArray) JNIHandles::make_local(env, res);
1662 }
1663
1664 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1665 constantPoolHandle cp(THREAD, k->constants());
1666
1667 // Ensure class is linked
1668 k->link_class(CHECK_NULL);
1669
1670 // Allocate result
1671 int num_fields;
1672
1673 if (publicOnly) {
1674 num_fields = 0;
1675 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1676 if (fs.access_flags().is_public()) ++num_fields;
1677 }
1678 } else {
1679 num_fields = k->java_fields_count();
1680 }
1681
1682 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1683 objArrayHandle result (THREAD, r);
1684
1685 int out_idx = 0;
1686 fieldDescriptor fd;
1687 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1688 if (!publicOnly || fs.access_flags().is_public()) {
1689 fd.reinitialize(k, fs.index());
1690 oop field = Reflection::new_field(&fd, CHECK_NULL);
1691 result->obj_at_put(out_idx, field);
1692 ++out_idx;
1693 }
1694 }
1695 assert(out_idx == num_fields, "just checking");
1696 return (jobjectArray) JNIHandles::make_local(env, result());
1697 }
1698 JVM_END
1699
1700 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1701 {
1702 JVMWrapper("JVM_IsRecord");
1703 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1704 if (k != NULL && k->is_instance_klass()) {
1705 InstanceKlass* ik = InstanceKlass::cast(k);
1706 return ik->is_record();
1707 } else {
1708 return false;
1709 }
1710 }
1711 JVM_END
1712
1713 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1714 {
1715 JVMWrapper("JVM_GetRecordComponents");
1716 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1717 assert(c->is_instance_klass(), "must be");
1718 InstanceKlass* ik = InstanceKlass::cast(c);
1719
1720 if (ik->is_record()) {
1721 Array<RecordComponent*>* components = ik->record_components();
1722 assert(components != NULL, "components should not be NULL");
1723 {
1724 JvmtiVMObjectAllocEventCollector oam;
1725 constantPoolHandle cp(THREAD, ik->constants());
1726 int length = components->length();
1727 assert(length >= 0, "unexpected record_components length");
1728 objArrayOop record_components =
1729 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL);
1730 objArrayHandle components_h (THREAD, record_components);
1731
1732 for (int x = 0; x < length; x++) {
1733 RecordComponent* component = components->at(x);
1734 assert(component != NULL, "unexpected NULL record component");
1735 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1736 components_h->obj_at_put(x, component_oop);
1737 }
1738 return (jobjectArray)JNIHandles::make_local(components_h());
1739 }
1740 }
1741
1742 // Return empty array if ofClass is not a record.
1743 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL);
1744 return (jobjectArray)JNIHandles::make_local(env, result);
1745 }
1746 JVM_END
1747
1748 static bool select_method(const methodHandle& method, bool want_constructor) {
1749 if (want_constructor) {
1750 return (method->is_initializer() && !method->is_static());
1751 } else {
1752 return (!method->is_initializer() && !method->is_overpass());
1753 }
1754 }
1755
1756 static jobjectArray get_class_declared_methods_helper(
1757 JNIEnv *env,
1758 jclass ofClass, jboolean publicOnly,
1759 bool want_constructor,
1760 Klass* klass, TRAPS) {
1761
1762 JvmtiVMObjectAllocEventCollector oam;
1763
1764 // Exclude primitive types and array types
1765 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1766 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1767 // Return empty array
1768 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1769 return (jobjectArray) JNIHandles::make_local(env, res);
1770 }
1771
1772 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1773
1774 // Ensure class is linked
1775 k->link_class(CHECK_NULL);
1776
1777 Array<Method*>* methods = k->methods();
1778 int methods_length = methods->length();
1779
1780 // Save original method_idnum in case of redefinition, which can change
1781 // the idnum of obsolete methods. The new method will have the same idnum
1782 // but if we refresh the methods array, the counts will be wrong.
1783 ResourceMark rm(THREAD);
1784 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1785 int num_methods = 0;
1786
1787 for (int i = 0; i < methods_length; i++) {
1788 methodHandle method(THREAD, methods->at(i));
1789 if (select_method(method, want_constructor)) {
1790 if (!publicOnly || method->is_public()) {
1791 idnums->push(method->method_idnum());
1792 ++num_methods;
1793 }
1794 }
1795 }
1796
1797 // Allocate result
1798 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1799 objArrayHandle result (THREAD, r);
1800
1801 // Now just put the methods that we selected above, but go by their idnum
1802 // in case of redefinition. The methods can be redefined at any safepoint,
1803 // so above when allocating the oop array and below when creating reflect
1804 // objects.
1805 for (int i = 0; i < num_methods; i++) {
1806 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1807 if (method.is_null()) {
1808 // Method may have been deleted and seems this API can handle null
1809 // Otherwise should probably put a method that throws NSME
1810 result->obj_at_put(i, NULL);
1811 } else {
1812 oop m;
1813 if (want_constructor) {
1814 m = Reflection::new_constructor(method, CHECK_NULL);
1815 } else {
1816 m = Reflection::new_method(method, false, CHECK_NULL);
1817 }
1818 result->obj_at_put(i, m);
1819 }
1820 }
1821
1822 return (jobjectArray) JNIHandles::make_local(env, result());
1823 }
1824
1825 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1826 {
1827 JVMWrapper("JVM_GetClassDeclaredMethods");
1828 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1829 /*want_constructor*/ false,
1830 SystemDictionary::reflect_Method_klass(), THREAD);
1831 }
1832 JVM_END
1833
1834 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1835 {
1836 JVMWrapper("JVM_GetClassDeclaredConstructors");
1837 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1838 /*want_constructor*/ true,
1839 SystemDictionary::reflect_Constructor_klass(), THREAD);
1840 }
1841 JVM_END
1842
1843 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1844 {
1845 JVMWrapper("JVM_GetClassAccessFlags");
1846 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1847 // Primitive type
1848 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1849 }
1850
1851 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1852 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1853 }
1854 JVM_END
1855
1856 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1857 {
1858 JVMWrapper("JVM_AreNestMates");
1859 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1860 assert(c->is_instance_klass(), "must be");
1861 InstanceKlass* ck = InstanceKlass::cast(c);
1862 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1863 assert(m->is_instance_klass(), "must be");
1864 InstanceKlass* mk = InstanceKlass::cast(m);
1865 return ck->has_nestmate_access_to(mk, THREAD);
1866 }
1867 JVM_END
1868
1869 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1870 {
1871 // current is not a primitive or array class
1872 JVMWrapper("JVM_GetNestHost");
1873 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1874 assert(c->is_instance_klass(), "must be");
1875 InstanceKlass* ck = InstanceKlass::cast(c);
1876 // Don't post exceptions if validation fails
1877 InstanceKlass* host = ck->nest_host(NULL, THREAD);
1878 return (jclass) (host == NULL ? NULL :
1879 JNIHandles::make_local(THREAD, host->java_mirror()));
1880 }
1881 JVM_END
1882
1883 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1884 {
1885 // current is not a primitive or array class
1886 JVMWrapper("JVM_GetNestMembers");
1887 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1888 assert(c->is_instance_klass(), "must be");
1889 InstanceKlass* ck = InstanceKlass::cast(c);
1890 // Get the nest host for this nest - throw ICCE if validation fails
1891 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
1892 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
1893
1894 {
1895 JvmtiVMObjectAllocEventCollector oam;
1896 Array<u2>* members = host->nest_members();
1897 int length = members == NULL ? 0 : members->length();
1898 // nest host is first in the array so make it one bigger
1899 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
1900 length + 1, CHECK_NULL);
1901 objArrayHandle result (THREAD, r);
1902 result->obj_at_put(0, host->java_mirror());
1903 if (length != 0) {
1904 int i;
1905 for (i = 0; i < length; i++) {
1906 int cp_index = members->at(i);
1907 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
1908 if (k->is_instance_klass()) {
1909 InstanceKlass* nest_host_k =
1910 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
1911 if (nest_host_k == host) {
1912 result->obj_at_put(i+1, k->java_mirror());
1913 }
1914 else {
1915 // k's nest host is legal but it isn't our host so
1916 // throw ICCE
1917 ResourceMark rm(THREAD);
1918 Exceptions::fthrow(THREAD_AND_LOCATION,
1919 icce,
1920 "Nest member %s in %s declares a different nest host of %s",
1921 k->external_name(),
1922 host->external_name(),
1923 nest_host_k->external_name()
1924 );
1925 return NULL;
1926 }
1927 }
1928 else {
1929 // we have a bad nest member entry - throw ICCE
1930 ResourceMark rm(THREAD);
1931 Exceptions::fthrow(THREAD_AND_LOCATION,
1932 icce,
1933 "Class %s can not be a nest member of %s",
1934 k->external_name(),
1935 host->external_name()
1936 );
1937 return NULL;
1938 }
1939 }
1940 }
1941 else {
1942 assert(host == ck, "must be singleton nest");
1943 }
1944 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1945 }
1946 }
1947 JVM_END
1948
1949 // Constant pool access //////////////////////////////////////////////////////////
1950
1951 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1952 {
1953 JVMWrapper("JVM_GetClassConstantPool");
1954 JvmtiVMObjectAllocEventCollector oam;
1955
1956 // Return null for primitives and arrays
1957 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1958 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1959 if (k->is_instance_klass()) {
1960 InstanceKlass* k_h = InstanceKlass::cast(k);
1961 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1962 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1963 return JNIHandles::make_local(jcp());
1964 }
1965 }
1966 return NULL;
1967 }
1968 JVM_END
1969
1970
1971 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1972 {
1973 JVMWrapper("JVM_ConstantPoolGetSize");
1974 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1975 return cp->length();
1976 }
1977 JVM_END
1978
1979
1980 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1981 {
1982 JVMWrapper("JVM_ConstantPoolGetClassAt");
1983 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1984 bounds_check(cp, index, CHECK_NULL);
1985 constantTag tag = cp->tag_at(index);
1986 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1987 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1988 }
1989 Klass* k = cp->klass_at(index, CHECK_NULL);
1990 return (jclass) JNIHandles::make_local(k->java_mirror());
1991 }
1992 JVM_END
1993
1994 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1995 {
1996 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1997 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1998 bounds_check(cp, index, CHECK_NULL);
1999 constantTag tag = cp->tag_at(index);
2000 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2001 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2002 }
2003 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2004 if (k == NULL) return NULL;
2005 return (jclass) JNIHandles::make_local(k->java_mirror());
2006 }
2007 JVM_END
2008
2009 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2010 constantTag tag = cp->tag_at(index);
2011 if (!tag.is_method() && !tag.is_interface_method()) {
2012 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2013 }
2014 int klass_ref = cp->uncached_klass_ref_index_at(index);
2015 Klass* k_o;
2016 if (force_resolution) {
2017 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2018 } else {
2019 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2020 if (k_o == NULL) return NULL;
2021 }
2022 InstanceKlass* k = InstanceKlass::cast(k_o);
2023 Symbol* name = cp->uncached_name_ref_at(index);
2024 Symbol* sig = cp->uncached_signature_ref_at(index);
2025 methodHandle m (THREAD, k->find_method(name, sig));
2026 if (m.is_null()) {
2027 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2028 }
2029 oop method;
2030 if (!m->is_initializer() || m->is_static()) {
2031 method = Reflection::new_method(m, true, CHECK_NULL);
2032 } else {
2033 method = Reflection::new_constructor(m, CHECK_NULL);
2034 }
2035 return JNIHandles::make_local(method);
2036 }
2037
2038 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2039 {
2040 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2041 JvmtiVMObjectAllocEventCollector oam;
2042 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2043 bounds_check(cp, index, CHECK_NULL);
2044 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2045 return res;
2046 }
2047 JVM_END
2048
2049 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2050 {
2051 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2052 JvmtiVMObjectAllocEventCollector oam;
2053 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2054 bounds_check(cp, index, CHECK_NULL);
2055 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2056 return res;
2057 }
2058 JVM_END
2059
2060 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2061 constantTag tag = cp->tag_at(index);
2062 if (!tag.is_field()) {
2063 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2064 }
2065 int klass_ref = cp->uncached_klass_ref_index_at(index);
2066 Klass* k_o;
2067 if (force_resolution) {
2068 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2069 } else {
2070 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2071 if (k_o == NULL) return NULL;
2072 }
2073 InstanceKlass* k = InstanceKlass::cast(k_o);
2074 Symbol* name = cp->uncached_name_ref_at(index);
2075 Symbol* sig = cp->uncached_signature_ref_at(index);
2076 fieldDescriptor fd;
2077 Klass* target_klass = k->find_field(name, sig, &fd);
2078 if (target_klass == NULL) {
2079 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2080 }
2081 oop field = Reflection::new_field(&fd, CHECK_NULL);
2082 return JNIHandles::make_local(field);
2083 }
2084
2085 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2086 {
2087 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2088 JvmtiVMObjectAllocEventCollector oam;
2089 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2090 bounds_check(cp, index, CHECK_NULL);
2091 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2092 return res;
2093 }
2094 JVM_END
2095
2096 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2097 {
2098 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2099 JvmtiVMObjectAllocEventCollector oam;
2100 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2101 bounds_check(cp, index, CHECK_NULL);
2102 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2103 return res;
2104 }
2105 JVM_END
2106
2107 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2108 {
2109 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2110 JvmtiVMObjectAllocEventCollector oam;
2111 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2112 bounds_check(cp, index, CHECK_NULL);
2113 constantTag tag = cp->tag_at(index);
2114 if (!tag.is_field_or_method()) {
2115 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2116 }
2117 int klass_ref = cp->uncached_klass_ref_index_at(index);
2118 Symbol* klass_name = cp->klass_name_at(klass_ref);
2119 Symbol* member_name = cp->uncached_name_ref_at(index);
2120 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2121 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2122 objArrayHandle dest(THREAD, dest_o);
2123 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2124 dest->obj_at_put(0, str());
2125 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2126 dest->obj_at_put(1, str());
2127 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2128 dest->obj_at_put(2, str());
2129 return (jobjectArray) JNIHandles::make_local(dest());
2130 }
2131 JVM_END
2132
2133 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2134 {
2135 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2136 JvmtiVMObjectAllocEventCollector oam;
2137 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2138 bounds_check(cp, index, CHECK_0);
2139 constantTag tag = cp->tag_at(index);
2140 if (!tag.is_field_or_method()) {
2141 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2142 }
2143 return (jint) cp->uncached_klass_ref_index_at(index);
2144 }
2145 JVM_END
2146
2147 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2148 {
2149 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2150 JvmtiVMObjectAllocEventCollector oam;
2151 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2152 bounds_check(cp, index, CHECK_0);
2153 constantTag tag = cp->tag_at(index);
2154 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2155 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2156 }
2157 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2158 }
2159 JVM_END
2160
2161 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2162 {
2163 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2164 JvmtiVMObjectAllocEventCollector oam;
2165 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2166 bounds_check(cp, index, CHECK_NULL);
2167 constantTag tag = cp->tag_at(index);
2168 if (!tag.is_name_and_type()) {
2169 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2170 }
2171 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2172 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2173 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2174 objArrayHandle dest(THREAD, dest_o);
2175 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2176 dest->obj_at_put(0, str());
2177 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2178 dest->obj_at_put(1, str());
2179 return (jobjectArray) JNIHandles::make_local(dest());
2180 }
2181 JVM_END
2182
2183 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2184 {
2185 JVMWrapper("JVM_ConstantPoolGetIntAt");
2186 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2187 bounds_check(cp, index, CHECK_0);
2188 constantTag tag = cp->tag_at(index);
2189 if (!tag.is_int()) {
2190 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2191 }
2192 return cp->int_at(index);
2193 }
2194 JVM_END
2195
2196 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2197 {
2198 JVMWrapper("JVM_ConstantPoolGetLongAt");
2199 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2200 bounds_check(cp, index, CHECK_(0L));
2201 constantTag tag = cp->tag_at(index);
2202 if (!tag.is_long()) {
2203 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2204 }
2205 return cp->long_at(index);
2206 }
2207 JVM_END
2208
2209 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2210 {
2211 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2212 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2213 bounds_check(cp, index, CHECK_(0.0f));
2214 constantTag tag = cp->tag_at(index);
2215 if (!tag.is_float()) {
2216 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2217 }
2218 return cp->float_at(index);
2219 }
2220 JVM_END
2221
2222 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2223 {
2224 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2225 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2226 bounds_check(cp, index, CHECK_(0.0));
2227 constantTag tag = cp->tag_at(index);
2228 if (!tag.is_double()) {
2229 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2230 }
2231 return cp->double_at(index);
2232 }
2233 JVM_END
2234
2235 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2236 {
2237 JVMWrapper("JVM_ConstantPoolGetStringAt");
2238 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2239 bounds_check(cp, index, CHECK_NULL);
2240 constantTag tag = cp->tag_at(index);
2241 if (!tag.is_string()) {
2242 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2243 }
2244 oop str = cp->string_at(index, CHECK_NULL);
2245 return (jstring) JNIHandles::make_local(str);
2246 }
2247 JVM_END
2248
2249 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2250 {
2251 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2252 JvmtiVMObjectAllocEventCollector oam;
2253 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2254 bounds_check(cp, index, CHECK_NULL);
2255 constantTag tag = cp->tag_at(index);
2256 if (!tag.is_symbol()) {
2257 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2258 }
2259 Symbol* sym = cp->symbol_at(index);
2260 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2261 return (jstring) JNIHandles::make_local(str());
2262 }
2263 JVM_END
2264
2265 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2266 {
2267 JVMWrapper("JVM_ConstantPoolGetTagAt");
2268 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2269 bounds_check(cp, index, CHECK_0);
2270 constantTag tag = cp->tag_at(index);
2271 jbyte result = tag.value();
2272 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2273 // they are changed to the corresponding tags from the JVM spec, so that java code in
2274 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2275 if (tag.is_klass_or_reference()) {
2276 result = JVM_CONSTANT_Class;
2277 } else if (tag.is_string_index()) {
2278 result = JVM_CONSTANT_String;
2279 } else if (tag.is_method_type_in_error()) {
2280 result = JVM_CONSTANT_MethodType;
2281 } else if (tag.is_method_handle_in_error()) {
2282 result = JVM_CONSTANT_MethodHandle;
2283 } else if (tag.is_dynamic_constant_in_error()) {
2284 result = JVM_CONSTANT_Dynamic;
2285 }
2286 return result;
2287 }
2288 JVM_END
2289
2290 // Assertion support. //////////////////////////////////////////////////////////
2291
2292 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2293 JVMWrapper("JVM_DesiredAssertionStatus");
2294 assert(cls != NULL, "bad class");
2295
2296 oop r = JNIHandles::resolve(cls);
2297 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2298 if (java_lang_Class::is_primitive(r)) return false;
2299
2300 Klass* k = java_lang_Class::as_Klass(r);
2301 assert(k->is_instance_klass(), "must be an instance klass");
2302 if (!k->is_instance_klass()) return false;
2303
2304 ResourceMark rm(THREAD);
2305 const char* name = k->name()->as_C_string();
2306 bool system_class = k->class_loader() == NULL;
2307 return JavaAssertions::enabled(name, system_class);
2308
2309 JVM_END
2310
2311
2312 // Return a new AssertionStatusDirectives object with the fields filled in with
2313 // command-line assertion arguments (i.e., -ea, -da).
2314 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2315 JVMWrapper("JVM_AssertionStatusDirectives");
2316 JvmtiVMObjectAllocEventCollector oam;
2317 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2318 return JNIHandles::make_local(env, asd);
2319 JVM_END
2320
2321 // Verification ////////////////////////////////////////////////////////////////////////////////
2322
2323 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2324
2325 // RedefineClasses support: bug 6214132 caused verification to fail.
2326 // All functions from this section should call the jvmtiThreadSate function:
2327 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2328 // The function returns a Klass* of the _scratch_class if the verifier
2329 // was invoked in the middle of the class redefinition.
2330 // Otherwise it returns its argument value which is the _the_class Klass*.
2331 // Please, refer to the description in the jvmtiThreadSate.hpp.
2332
2333 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2334 JVMWrapper("JVM_GetClassNameUTF");
2335 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2336 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2337 return k->name()->as_utf8();
2338 JVM_END
2339
2340
2341 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2342 JVMWrapper("JVM_GetClassCPTypes");
2343 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2344 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2345 // types will have length zero if this is not an InstanceKlass
2346 // (length is determined by call to JVM_GetClassCPEntriesCount)
2347 if (k->is_instance_klass()) {
2348 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2349 for (int index = cp->length() - 1; index >= 0; index--) {
2350 constantTag tag = cp->tag_at(index);
2351 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2352 }
2353 }
2354 JVM_END
2355
2356
2357 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2358 JVMWrapper("JVM_GetClassCPEntriesCount");
2359 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2360 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2361 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2362 JVM_END
2363
2364
2365 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2366 JVMWrapper("JVM_GetClassFieldsCount");
2367 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2368 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2369 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2370 JVM_END
2371
2372
2373 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2374 JVMWrapper("JVM_GetClassMethodsCount");
2375 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2376 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2377 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2378 JVM_END
2379
2380
2381 // The following methods, used for the verifier, are never called with
2382 // array klasses, so a direct cast to InstanceKlass is safe.
2383 // Typically, these methods are called in a loop with bounds determined
2384 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2385 // zero for arrays.
2386 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2387 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2388 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2389 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2390 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2391 int length = method->checked_exceptions_length();
2392 if (length > 0) {
2393 CheckedExceptionElement* table= method->checked_exceptions_start();
2394 for (int i = 0; i < length; i++) {
2395 exceptions[i] = table[i].class_cp_index;
2396 }
2397 }
2398 JVM_END
2399
2400
2401 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2402 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2403 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2404 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2405 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2406 return method->checked_exceptions_length();
2407 JVM_END
2408
2409
2410 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2411 JVMWrapper("JVM_GetMethodIxByteCode");
2412 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2413 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2414 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2415 memcpy(code, method->code_base(), method->code_size());
2416 JVM_END
2417
2418
2419 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2420 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2421 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2422 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2423 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2424 return method->code_size();
2425 JVM_END
2426
2427
2428 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2429 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2430 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2431 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2432 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2433 ExceptionTable extable(method);
2434 entry->start_pc = extable.start_pc(entry_index);
2435 entry->end_pc = extable.end_pc(entry_index);
2436 entry->handler_pc = extable.handler_pc(entry_index);
2437 entry->catchType = extable.catch_type_index(entry_index);
2438 JVM_END
2439
2440
2441 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2442 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2443 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2444 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2445 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2446 return method->exception_table_length();
2447 JVM_END
2448
2449
2450 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2451 JVMWrapper("JVM_GetMethodIxModifiers");
2452 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2453 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2454 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2455 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2456 JVM_END
2457
2458
2459 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2460 JVMWrapper("JVM_GetFieldIxModifiers");
2461 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2462 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2463 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2464 JVM_END
2465
2466
2467 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2468 JVMWrapper("JVM_GetMethodIxLocalsCount");
2469 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2470 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2471 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2472 return method->max_locals();
2473 JVM_END
2474
2475
2476 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2477 JVMWrapper("JVM_GetMethodIxArgsSize");
2478 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2479 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2480 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2481 return method->size_of_parameters();
2482 JVM_END
2483
2484
2485 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2486 JVMWrapper("JVM_GetMethodIxMaxStack");
2487 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2488 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2489 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2490 return method->verifier_max_stack();
2491 JVM_END
2492
2493
2494 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2495 JVMWrapper("JVM_IsConstructorIx");
2496 ResourceMark rm(THREAD);
2497 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2498 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2499 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2500 return method->name() == vmSymbols::object_initializer_name();
2501 JVM_END
2502
2503
2504 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2505 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2506 ResourceMark rm(THREAD);
2507 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2508 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2509 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2510 return method->is_overpass();
2511 JVM_END
2512
2513 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2514 JVMWrapper("JVM_GetMethodIxIxUTF");
2515 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2516 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2517 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2518 return method->name()->as_utf8();
2519 JVM_END
2520
2521
2522 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2523 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2524 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2525 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2526 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2527 return method->signature()->as_utf8();
2528 JVM_END
2529
2530 /**
2531 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2532 * read entries in the constant pool. Since the old verifier always
2533 * works on a copy of the code, it will not see any rewriting that
2534 * may possibly occur in the middle of verification. So it is important
2535 * that nothing it calls tries to use the cpCache instead of the raw
2536 * constant pool, so we must use cp->uncached_x methods when appropriate.
2537 */
2538 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2539 JVMWrapper("JVM_GetCPFieldNameUTF");
2540 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2541 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2542 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2543 switch (cp->tag_at(cp_index).value()) {
2544 case JVM_CONSTANT_Fieldref:
2545 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2546 default:
2547 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2548 }
2549 ShouldNotReachHere();
2550 return NULL;
2551 JVM_END
2552
2553
2554 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2555 JVMWrapper("JVM_GetCPMethodNameUTF");
2556 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2557 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2558 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2559 switch (cp->tag_at(cp_index).value()) {
2560 case JVM_CONSTANT_InterfaceMethodref:
2561 case JVM_CONSTANT_Methodref:
2562 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2563 default:
2564 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2565 }
2566 ShouldNotReachHere();
2567 return NULL;
2568 JVM_END
2569
2570
2571 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2572 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2573 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2574 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2575 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2576 switch (cp->tag_at(cp_index).value()) {
2577 case JVM_CONSTANT_InterfaceMethodref:
2578 case JVM_CONSTANT_Methodref:
2579 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2580 default:
2581 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2582 }
2583 ShouldNotReachHere();
2584 return NULL;
2585 JVM_END
2586
2587
2588 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2589 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2590 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2591 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2592 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2593 switch (cp->tag_at(cp_index).value()) {
2594 case JVM_CONSTANT_Fieldref:
2595 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2596 default:
2597 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2598 }
2599 ShouldNotReachHere();
2600 return NULL;
2601 JVM_END
2602
2603
2604 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2605 JVMWrapper("JVM_GetCPClassNameUTF");
2606 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2607 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2608 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2609 Symbol* classname = cp->klass_name_at(cp_index);
2610 return classname->as_utf8();
2611 JVM_END
2612
2613
2614 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2615 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2616 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2617 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2618 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2619 switch (cp->tag_at(cp_index).value()) {
2620 case JVM_CONSTANT_Fieldref: {
2621 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2622 Symbol* classname = cp->klass_name_at(class_index);
2623 return classname->as_utf8();
2624 }
2625 default:
2626 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2627 }
2628 ShouldNotReachHere();
2629 return NULL;
2630 JVM_END
2631
2632
2633 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2634 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2635 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2636 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2637 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2638 switch (cp->tag_at(cp_index).value()) {
2639 case JVM_CONSTANT_Methodref:
2640 case JVM_CONSTANT_InterfaceMethodref: {
2641 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2642 Symbol* classname = cp->klass_name_at(class_index);
2643 return classname->as_utf8();
2644 }
2645 default:
2646 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2647 }
2648 ShouldNotReachHere();
2649 return NULL;
2650 JVM_END
2651
2652
2653 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2654 JVMWrapper("JVM_GetCPFieldModifiers");
2655 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2656 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2657 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2658 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2659 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2660 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2661 switch (cp->tag_at(cp_index).value()) {
2662 case JVM_CONSTANT_Fieldref: {
2663 Symbol* name = cp->uncached_name_ref_at(cp_index);
2664 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2665 InstanceKlass* ik = InstanceKlass::cast(k_called);
2666 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2667 if (fs.name() == name && fs.signature() == signature) {
2668 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2669 }
2670 }
2671 return -1;
2672 }
2673 default:
2674 fatal("JVM_GetCPFieldModifiers: illegal constant");
2675 }
2676 ShouldNotReachHere();
2677 return 0;
2678 JVM_END
2679
2680
2681 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2682 JVMWrapper("JVM_GetCPMethodModifiers");
2683 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2684 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2685 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2686 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2687 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2688 switch (cp->tag_at(cp_index).value()) {
2689 case JVM_CONSTANT_Methodref:
2690 case JVM_CONSTANT_InterfaceMethodref: {
2691 Symbol* name = cp->uncached_name_ref_at(cp_index);
2692 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2693 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2694 int methods_count = methods->length();
2695 for (int i = 0; i < methods_count; i++) {
2696 Method* method = methods->at(i);
2697 if (method->name() == name && method->signature() == signature) {
2698 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2699 }
2700 }
2701 return -1;
2702 }
2703 default:
2704 fatal("JVM_GetCPMethodModifiers: illegal constant");
2705 }
2706 ShouldNotReachHere();
2707 return 0;
2708 JVM_END
2709
2710
2711 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2712
2713 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2714 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2715 JVM_END
2716
2717
2718 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2719 JVMWrapper("JVM_IsSameClassPackage");
2720 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2721 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2722 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2723 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2724 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2725 JVM_END
2726
2727 // Printing support //////////////////////////////////////////////////
2728 extern "C" {
2729
2730 ATTRIBUTE_PRINTF(3, 0)
2731 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2732 // Reject count values that are negative signed values converted to
2733 // unsigned; see bug 4399518, 4417214
2734 if ((intptr_t)count <= 0) return -1;
2735
2736 int result = os::vsnprintf(str, count, fmt, args);
2737 if (result > 0 && (size_t)result >= count) {
2738 result = -1;
2739 }
2740
2741 return result;
2742 }
2743
2744 ATTRIBUTE_PRINTF(3, 4)
2745 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2746 va_list args;
2747 int len;
2748 va_start(args, fmt);
2749 len = jio_vsnprintf(str, count, fmt, args);
2750 va_end(args);
2751 return len;
2752 }
2753
2754 ATTRIBUTE_PRINTF(2, 3)
2755 int jio_fprintf(FILE* f, const char *fmt, ...) {
2756 int len;
2757 va_list args;
2758 va_start(args, fmt);
2759 len = jio_vfprintf(f, fmt, args);
2760 va_end(args);
2761 return len;
2762 }
2763
2764 ATTRIBUTE_PRINTF(2, 0)
2765 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2766 if (Arguments::vfprintf_hook() != NULL) {
2767 return Arguments::vfprintf_hook()(f, fmt, args);
2768 } else {
2769 return vfprintf(f, fmt, args);
2770 }
2771 }
2772
2773 ATTRIBUTE_PRINTF(1, 2)
2774 JNIEXPORT int jio_printf(const char *fmt, ...) {
2775 int len;
2776 va_list args;
2777 va_start(args, fmt);
2778 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2779 va_end(args);
2780 return len;
2781 }
2782
2783 // HotSpot specific jio method
2784 void jio_print(const char* s, size_t len) {
2785 // Try to make this function as atomic as possible.
2786 if (Arguments::vfprintf_hook() != NULL) {
2787 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2788 } else {
2789 // Make an unused local variable to avoid warning from gcc compiler.
2790 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2791 }
2792 }
2793
2794 } // Extern C
2795
2796 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2797
2798 // In most of the JVM thread support functions we need to access the
2799 // thread through a ThreadsListHandle to prevent it from exiting and
2800 // being reclaimed while we try to operate on it. The exceptions to this
2801 // rule are when operating on the current thread, or if the monitor of
2802 // the target java.lang.Thread is locked at the Java level - in both
2803 // cases the target cannot exit.
2804
2805 static void thread_entry(JavaThread* thread, TRAPS) {
2806 HandleMark hm(THREAD);
2807 Handle obj(THREAD, thread->threadObj());
2808 JavaValue result(T_VOID);
2809 JavaCalls::call_virtual(&result,
2810 obj,
2811 SystemDictionary::Thread_klass(),
2812 vmSymbols::run_method_name(),
2813 vmSymbols::void_method_signature(),
2814 THREAD);
2815 }
2816
2817
2818 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2819 JVMWrapper("JVM_StartThread");
2820 JavaThread *native_thread = NULL;
2821
2822 // We cannot hold the Threads_lock when we throw an exception,
2823 // due to rank ordering issues. Example: we might need to grab the
2824 // Heap_lock while we construct the exception.
2825 bool throw_illegal_thread_state = false;
2826
2827 // We must release the Threads_lock before we can post a jvmti event
2828 // in Thread::start.
2829 {
2830 // Ensure that the C++ Thread and OSThread structures aren't freed before
2831 // we operate.
2832 MutexLocker mu(Threads_lock);
2833
2834 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2835 // re-starting an already started thread, so we should usually find
2836 // that the JavaThread is null. However for a JNI attached thread
2837 // there is a small window between the Thread object being created
2838 // (with its JavaThread set) and the update to its threadStatus, so we
2839 // have to check for this
2840 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2841 throw_illegal_thread_state = true;
2842 } else {
2843 // We could also check the stillborn flag to see if this thread was already stopped, but
2844 // for historical reasons we let the thread detect that itself when it starts running
2845
2846 jlong size =
2847 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2848 // Allocate the C++ Thread structure and create the native thread. The
2849 // stack size retrieved from java is 64-bit signed, but the constructor takes
2850 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2851 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2852 // - Avoid passing negative values which would result in really large stacks.
2853 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2854 size_t sz = size > 0 ? (size_t) size : 0;
2855 native_thread = new JavaThread(&thread_entry, sz);
2856
2857 // At this point it may be possible that no osthread was created for the
2858 // JavaThread due to lack of memory. Check for this situation and throw
2859 // an exception if necessary. Eventually we may want to change this so
2860 // that we only grab the lock if the thread was created successfully -
2861 // then we can also do this check and throw the exception in the
2862 // JavaThread constructor.
2863 if (native_thread->osthread() != NULL) {
2864 // Note: the current thread is not being used within "prepare".
2865 native_thread->prepare(jthread);
2866 }
2867 }
2868 }
2869
2870 if (throw_illegal_thread_state) {
2871 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2872 }
2873
2874 assert(native_thread != NULL, "Starting null thread?");
2875
2876 if (native_thread->osthread() == NULL) {
2877 // No one should hold a reference to the 'native_thread'.
2878 native_thread->smr_delete();
2879 if (JvmtiExport::should_post_resource_exhausted()) {
2880 JvmtiExport::post_resource_exhausted(
2881 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2882 os::native_thread_creation_failed_msg());
2883 }
2884 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2885 os::native_thread_creation_failed_msg());
2886 }
2887
2888 Thread::start(native_thread);
2889
2890 JVM_END
2891
2892
2893 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2894 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2895 // but is thought to be reliable and simple. In the case, where the receiver is the
2896 // same thread as the sender, no VM_Operation is needed.
2897 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2898 JVMWrapper("JVM_StopThread");
2899
2900 // A nested ThreadsListHandle will grab the Threads_lock so create
2901 // tlh before we resolve throwable.
2902 ThreadsListHandle tlh(thread);
2903 oop java_throwable = JNIHandles::resolve(throwable);
2904 if (java_throwable == NULL) {
2905 THROW(vmSymbols::java_lang_NullPointerException());
2906 }
2907 oop java_thread = NULL;
2908 JavaThread* receiver = NULL;
2909 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2910 Events::log_exception(thread,
2911 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2912 p2i(receiver), p2i(java_thread), p2i(throwable));
2913
2914 if (is_alive) {
2915 // jthread refers to a live JavaThread.
2916 if (thread == receiver) {
2917 // Exception is getting thrown at self so no VM_Operation needed.
2918 THROW_OOP(java_throwable);
2919 } else {
2920 // Use a VM_Operation to throw the exception.
2921 Thread::send_async_exception(java_thread, java_throwable);
2922 }
2923 } else {
2924 // Either:
2925 // - target thread has not been started before being stopped, or
2926 // - target thread already terminated
2927 // We could read the threadStatus to determine which case it is
2928 // but that is overkill as it doesn't matter. We must set the
2929 // stillborn flag for the first case, and if the thread has already
2930 // exited setting this flag has no effect.
2931 java_lang_Thread::set_stillborn(java_thread);
2932 }
2933 JVM_END
2934
2935
2936 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2937 JVMWrapper("JVM_IsThreadAlive");
2938
2939 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2940 return java_lang_Thread::is_alive(thread_oop);
2941 JVM_END
2942
2943
2944 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2945 JVMWrapper("JVM_SuspendThread");
2946
2947 ThreadsListHandle tlh(thread);
2948 JavaThread* receiver = NULL;
2949 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2950 if (is_alive) {
2951 // jthread refers to a live JavaThread.
2952 {
2953 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2954 if (receiver->is_external_suspend()) {
2955 // Don't allow nested external suspend requests. We can't return
2956 // an error from this interface so just ignore the problem.
2957 return;
2958 }
2959 if (receiver->is_exiting()) { // thread is in the process of exiting
2960 return;
2961 }
2962 receiver->set_external_suspend();
2963 }
2964
2965 // java_suspend() will catch threads in the process of exiting
2966 // and will ignore them.
2967 receiver->java_suspend();
2968
2969 // It would be nice to have the following assertion in all the
2970 // time, but it is possible for a racing resume request to have
2971 // resumed this thread right after we suspended it. Temporarily
2972 // enable this assertion if you are chasing a different kind of
2973 // bug.
2974 //
2975 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2976 // receiver->is_being_ext_suspended(), "thread is not suspended");
2977 }
2978 JVM_END
2979
2980
2981 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2982 JVMWrapper("JVM_ResumeThread");
2983
2984 ThreadsListHandle tlh(thread);
2985 JavaThread* receiver = NULL;
2986 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2987 if (is_alive) {
2988 // jthread refers to a live JavaThread.
2989
2990 // This is the original comment for this Threads_lock grab:
2991 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2992 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2993 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2994 // looks at it.
2995 //
2996 // The above comment dates back to when we had both internal and
2997 // external suspend APIs that shared a common underlying mechanism.
2998 // External suspend is now entirely cooperative and doesn't share
2999 // anything with internal suspend. That said, there are some
3000 // assumptions in the VM that an external resume grabs the
3001 // Threads_lock. We can't drop the Threads_lock grab here until we
3002 // resolve the assumptions that exist elsewhere.
3003 //
3004 MutexLocker ml(Threads_lock);
3005 receiver->java_resume();
3006 }
3007 JVM_END
3008
3009
3010 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3011 JVMWrapper("JVM_SetThreadPriority");
3012
3013 ThreadsListHandle tlh(thread);
3014 oop java_thread = NULL;
3015 JavaThread* receiver = NULL;
3016 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3017 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3018
3019 if (is_alive) {
3020 // jthread refers to a live JavaThread.
3021 Thread::set_priority(receiver, (ThreadPriority)prio);
3022 }
3023 // Implied else: If the JavaThread hasn't started yet, then the
3024 // priority set in the java.lang.Thread object above will be pushed
3025 // down when it does start.
3026 JVM_END
3027
3028
3029 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3030 JVMWrapper("JVM_Yield");
3031 if (os::dont_yield()) return;
3032 HOTSPOT_THREAD_YIELD();
3033 os::naked_yield();
3034 JVM_END
3035
3036 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3037 assert(event != NULL, "invariant");
3038 assert(event->should_commit(), "invariant");
3039 event->set_time(millis);
3040 event->commit();
3041 }
3042
3043 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3044 JVMWrapper("JVM_Sleep");
3045
3046 if (millis < 0) {
3047 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3048 }
3049
3050 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3051 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3052 }
3053
3054 // Save current thread state and restore it at the end of this block.
3055 // And set new thread state to SLEEPING.
3056 JavaThreadSleepState jtss(thread);
3057
3058 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3059 EventThreadSleep event;
3060
3061 if (millis == 0) {
3062 os::naked_yield();
3063 } else {
3064 ThreadState old_state = thread->osthread()->get_state();
3065 thread->osthread()->set_state(SLEEPING);
3066 if (!thread->sleep(millis)) { // interrupted
3067 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3068 // us while we were sleeping. We do not overwrite those.
3069 if (!HAS_PENDING_EXCEPTION) {
3070 if (event.should_commit()) {
3071 post_thread_sleep_event(&event, millis);
3072 }
3073 HOTSPOT_THREAD_SLEEP_END(1);
3074
3075 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3076 // to properly restore the thread state. That's likely wrong.
3077 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3078 }
3079 }
3080 thread->osthread()->set_state(old_state);
3081 }
3082 if (event.should_commit()) {
3083 post_thread_sleep_event(&event, millis);
3084 }
3085 HOTSPOT_THREAD_SLEEP_END(0);
3086 JVM_END
3087
3088 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3089 JVMWrapper("JVM_CurrentThread");
3090 oop jthread = thread->threadObj();
3091 assert (thread != NULL, "no current thread!");
3092 return JNIHandles::make_local(env, jthread);
3093 JVM_END
3094
3095 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3096 JVMWrapper("JVM_Interrupt");
3097
3098 ThreadsListHandle tlh(thread);
3099 JavaThread* receiver = NULL;
3100 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3101 if (is_alive) {
3102 // jthread refers to a live JavaThread.
3103 receiver->interrupt();
3104 }
3105 JVM_END
3106
3107
3108 // Return true iff the current thread has locked the object passed in
3109
3110 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3111 JVMWrapper("JVM_HoldsLock");
3112 assert(THREAD->is_Java_thread(), "sanity check");
3113 if (obj == NULL) {
3114 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3115 }
3116 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3117 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3118 JVM_END
3119
3120
3121 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3122 JVMWrapper("JVM_DumpAllStacks");
3123 VM_PrintThreads op;
3124 VMThread::execute(&op);
3125 if (JvmtiExport::should_post_data_dump()) {
3126 JvmtiExport::post_data_dump();
3127 }
3128 JVM_END
3129
3130 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3131 JVMWrapper("JVM_SetNativeThreadName");
3132
3133 // We don't use a ThreadsListHandle here because the current thread
3134 // must be alive.
3135 oop java_thread = JNIHandles::resolve_non_null(jthread);
3136 JavaThread* thr = java_lang_Thread::thread(java_thread);
3137 if (thread == thr && !thr->has_attached_via_jni()) {
3138 // Thread naming is only supported for the current thread and
3139 // we don't set the name of an attached thread to avoid stepping
3140 // on other programs.
3141 ResourceMark rm(thread);
3142 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3143 os::set_native_thread_name(thread_name);
3144 }
3145 JVM_END
3146
3147 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3148
3149 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3150 JVMWrapper("JVM_GetClassContext");
3151 ResourceMark rm(THREAD);
3152 JvmtiVMObjectAllocEventCollector oam;
3153 vframeStream vfst(thread);
3154
3155 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3156 // This must only be called from SecurityManager.getClassContext
3157 Method* m = vfst.method();
3158 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3159 m->name() == vmSymbols::getClassContext_name() &&
3160 m->signature() == vmSymbols::void_class_array_signature())) {
3161 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3162 }
3163 }
3164
3165 // Collect method holders
3166 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3167 for (; !vfst.at_end(); vfst.security_next()) {
3168 Method* m = vfst.method();
3169 // Native frames are not returned
3170 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3171 Klass* holder = m->method_holder();
3172 assert(holder->is_klass(), "just checking");
3173 klass_array->append(holder);
3174 }
3175 }
3176
3177 // Create result array of type [Ljava/lang/Class;
3178 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3179 // Fill in mirrors corresponding to method holders
3180 for (int i = 0; i < klass_array->length(); i++) {
3181 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3182 }
3183
3184 return (jobjectArray) JNIHandles::make_local(env, result);
3185 JVM_END
3186
3187
3188 // java.lang.Package ////////////////////////////////////////////////////////////////
3189
3190
3191 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3192 JVMWrapper("JVM_GetSystemPackage");
3193 ResourceMark rm(THREAD);
3194 JvmtiVMObjectAllocEventCollector oam;
3195 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3196 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3197 return (jstring) JNIHandles::make_local(result);
3198 JVM_END
3199
3200
3201 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3202 JVMWrapper("JVM_GetSystemPackages");
3203 JvmtiVMObjectAllocEventCollector oam;
3204 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3205 return (jobjectArray) JNIHandles::make_local(result);
3206 JVM_END
3207
3208
3209 // java.lang.ref.Finalizer ///////////////////////////////////////////////////////////////
3210
3211 JVM_ENTRY(jboolean, JVM_GetTsanEnabled(JNIEnv *env))
3212 JVMWrapper("JVM_GetTsanEnabled");
3213 TSAN_ONLY(return ThreadSanitizer;)
3214 NOT_TSAN(return JNI_FALSE;)
3215 JVM_END
3216
3217
3218 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3219
3220
3221 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3222 JVMWrapper("JVM_GetAndClearReferencePendingList");
3223
3224 MonitorLocker ml(Heap_lock);
3225 oop ref = Universe::reference_pending_list();
3226 if (ref != NULL) {
3227 Universe::set_reference_pending_list(NULL);
3228 }
3229 return JNIHandles::make_local(env, ref);
3230 JVM_END
3231
3232 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3233 JVMWrapper("JVM_HasReferencePendingList");
3234 MonitorLocker ml(Heap_lock);
3235 return Universe::has_reference_pending_list();
3236 JVM_END
3237
3238 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3239 JVMWrapper("JVM_WaitForReferencePendingList");
3240 MonitorLocker ml(Heap_lock);
3241 while (!Universe::has_reference_pending_list()) {
3242 ml.wait();
3243 }
3244 JVM_END
3245
3246
3247 // ObjectInputStream ///////////////////////////////////////////////////////////////
3248
3249 // Return the first user-defined class loader up the execution stack, or null
3250 // if only code from the bootstrap or platform class loader is on the stack.
3251
3252 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3253 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3254 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3255 oop loader = vfst.method()->method_holder()->class_loader();
3256 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3257 return JNIHandles::make_local(env, loader);
3258 }
3259 }
3260 return NULL;
3261 JVM_END
3262
3263
3264 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3265
3266
3267 // resolve array handle and check arguments
3268 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3269 if (arr == NULL) {
3270 THROW_0(vmSymbols::java_lang_NullPointerException());
3271 }
3272 oop a = JNIHandles::resolve_non_null(arr);
3273 if (!a->is_array()) {
3274 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3275 } else if (type_array_only && !a->is_typeArray()) {
3276 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3277 }
3278 return arrayOop(a);
3279 }
3280
3281
3282 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3283 JVMWrapper("JVM_GetArrayLength");
3284 arrayOop a = check_array(env, arr, false, CHECK_0);
3285 return a->length();
3286 JVM_END
3287
3288
3289 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3290 JVMWrapper("JVM_Array_Get");
3291 JvmtiVMObjectAllocEventCollector oam;
3292 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3293 jvalue value;
3294 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3295 oop box = Reflection::box(&value, type, CHECK_NULL);
3296 return JNIHandles::make_local(env, box);
3297 JVM_END
3298
3299
3300 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3301 JVMWrapper("JVM_GetPrimitiveArrayElement");
3302 jvalue value;
3303 value.i = 0; // to initialize value before getting used in CHECK
3304 arrayOop a = check_array(env, arr, true, CHECK_(value));
3305 assert(a->is_typeArray(), "just checking");
3306 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3307 BasicType wide_type = (BasicType) wCode;
3308 if (type != wide_type) {
3309 Reflection::widen(&value, type, wide_type, CHECK_(value));
3310 }
3311 return value;
3312 JVM_END
3313
3314
3315 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3316 JVMWrapper("JVM_SetArrayElement");
3317 arrayOop a = check_array(env, arr, false, CHECK);
3318 oop box = JNIHandles::resolve(val);
3319 jvalue value;
3320 value.i = 0; // to initialize value before getting used in CHECK
3321 BasicType value_type;
3322 if (a->is_objArray()) {
3323 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3324 value_type = Reflection::unbox_for_regular_object(box, &value);
3325 } else {
3326 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3327 }
3328 Reflection::array_set(&value, a, index, value_type, CHECK);
3329 JVM_END
3330
3331
3332 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3333 JVMWrapper("JVM_SetPrimitiveArrayElement");
3334 arrayOop a = check_array(env, arr, true, CHECK);
3335 assert(a->is_typeArray(), "just checking");
3336 BasicType value_type = (BasicType) vCode;
3337 Reflection::array_set(&v, a, index, value_type, CHECK);
3338 JVM_END
3339
3340
3341 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3342 JVMWrapper("JVM_NewArray");
3343 JvmtiVMObjectAllocEventCollector oam;
3344 oop element_mirror = JNIHandles::resolve(eltClass);
3345 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3346 return JNIHandles::make_local(env, result);
3347 JVM_END
3348
3349
3350 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3351 JVMWrapper("JVM_NewMultiArray");
3352 JvmtiVMObjectAllocEventCollector oam;
3353 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3354 oop element_mirror = JNIHandles::resolve(eltClass);
3355 assert(dim_array->is_typeArray(), "just checking");
3356 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3357 return JNIHandles::make_local(env, result);
3358 JVM_END
3359
3360
3361 // Library support ///////////////////////////////////////////////////////////////////////////
3362
3363 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3364 //%note jvm_ct
3365 JVMWrapper("JVM_LoadLibrary");
3366 char ebuf[1024];
3367 void *load_result;
3368 {
3369 ThreadToNativeFromVM ttnfvm(thread);
3370 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3371 }
3372 if (load_result == NULL) {
3373 char msg[1024];
3374 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3375 // Since 'ebuf' may contain a string encoded using
3376 // platform encoding scheme, we need to pass
3377 // Exceptions::unsafe_to_utf8 to the new_exception method
3378 // as the last argument. See bug 6367357.
3379 Handle h_exception =
3380 Exceptions::new_exception(thread,
3381 vmSymbols::java_lang_UnsatisfiedLinkError(),
3382 msg, Exceptions::unsafe_to_utf8);
3383
3384 THROW_HANDLE_0(h_exception);
3385 }
3386 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3387 return load_result;
3388 JVM_END
3389
3390
3391 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3392 JVMWrapper("JVM_UnloadLibrary");
3393 os::dll_unload(handle);
3394 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3395 JVM_END
3396
3397
3398 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3399 JVMWrapper("JVM_FindLibraryEntry");
3400 void* find_result = os::dll_lookup(handle, name);
3401 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3402 find_result != NULL ? "Found" : "Failed to find",
3403 name, p2i(handle));
3404 return find_result;
3405 JVM_END
3406
3407
3408 // JNI version ///////////////////////////////////////////////////////////////////////////////
3409
3410 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3411 JVMWrapper("JVM_IsSupportedJNIVersion");
3412 return Threads::is_supported_jni_version_including_1_1(version);
3413 JVM_END
3414
3415
3416 // String support ///////////////////////////////////////////////////////////////////////////
3417
3418 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3419 JVMWrapper("JVM_InternString");
3420 JvmtiVMObjectAllocEventCollector oam;
3421 if (str == NULL) return NULL;
3422 oop string = JNIHandles::resolve_non_null(str);
3423 oop result = StringTable::intern(string, CHECK_NULL);
3424 return (jstring) JNIHandles::make_local(env, result);
3425 JVM_END
3426
3427
3428 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3429
3430 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3431 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3432 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3433 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3434 // nature. JavaThreads will be "in native" when using this API from JDK code.
3435
3436
3437 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3438 VM_Exit::block_if_vm_exited();
3439 JVMWrapper("JVM_RawMonitorCreate");
3440 void *mon = new os::PlatformMutex();
3441 TSAN_RUNTIME_ONLY(TSAN_RAW_LOCK_CREATE(mon));
3442 return mon;
3443 }
3444
3445
3446 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3447 VM_Exit::block_if_vm_exited();
3448 JVMWrapper("JVM_RawMonitorDestroy");
3449 TSAN_RUNTIME_ONLY(TSAN_RAW_LOCK_DESTROY(mon));
3450 delete ((os::PlatformMutex*) mon);
3451 }
3452
3453
3454 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3455 VM_Exit::block_if_vm_exited();
3456 JVMWrapper("JVM_RawMonitorEnter");
3457 ((os::PlatformMutex*) mon)->lock();
3458 TSAN_RUNTIME_ONLY(TSAN_RAW_LOCK_ACQUIRED(mon));
3459 return 0;
3460 }
3461
3462
3463 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3464 VM_Exit::block_if_vm_exited();
3465 JVMWrapper("JVM_RawMonitorExit");
3466 TSAN_RUNTIME_ONLY(TSAN_RAW_LOCK_RELEASED(mon));
3467 ((os::PlatformMutex*) mon)->unlock();
3468 }
3469
3470
3471 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3472
3473 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3474 Handle loader, Handle protection_domain,
3475 jboolean throwError, TRAPS) {
3476 // Security Note:
3477 // The Java level wrapper will perform the necessary security check allowing
3478 // us to pass the NULL as the initiating class loader. The VM is responsible for
3479 // the checkPackageAccess relative to the initiating class loader via the
3480 // protection_domain. The protection_domain is passed as NULL by the java code
3481 // if there is no security manager in 3-arg Class.forName().
3482 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3483
3484 // Check if we should initialize the class
3485 if (init && klass->is_instance_klass()) {
3486 klass->initialize(CHECK_NULL);
3487 }
3488 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3489 }
3490
3491
3492 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3493
3494 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3495 JVMWrapper("JVM_InvokeMethod");
3496 Handle method_handle;
3497 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3498 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3499 Handle receiver(THREAD, JNIHandles::resolve(obj));
3500 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3501 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3502 jobject res = JNIHandles::make_local(env, result);
3503 if (JvmtiExport::should_post_vm_object_alloc()) {
3504 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3505 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3506 if (java_lang_Class::is_primitive(ret_type)) {
3507 // Only for primitive type vm allocates memory for java object.
3508 // See box() method.
3509 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3510 }
3511 }
3512 return res;
3513 } else {
3514 THROW_0(vmSymbols::java_lang_StackOverflowError());
3515 }
3516 JVM_END
3517
3518
3519 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3520 JVMWrapper("JVM_NewInstanceFromConstructor");
3521 oop constructor_mirror = JNIHandles::resolve(c);
3522 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3523 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3524 jobject res = JNIHandles::make_local(env, result);
3525 if (JvmtiExport::should_post_vm_object_alloc()) {
3526 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3527 }
3528 return res;
3529 JVM_END
3530
3531 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3532
3533 JVM_LEAF(jboolean, JVM_SupportsCX8())
3534 JVMWrapper("JVM_SupportsCX8");
3535 return VM_Version::supports_cx8();
3536 JVM_END
3537
3538 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3539 JVMWrapper("JVM_InitializeFromArchive");
3540 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3541 assert(k->is_klass(), "just checking");
3542 HeapShared::initialize_from_archived_subgraph(k);
3543 JVM_END
3544
3545 // Returns an array of all live Thread objects (VM internal JavaThreads,
3546 // jvmti agent threads, and JNI attaching threads are skipped)
3547 // See CR 6404306 regarding JNI attaching threads
3548 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3549 ResourceMark rm(THREAD);
3550 ThreadsListEnumerator tle(THREAD, false, false);
3551 JvmtiVMObjectAllocEventCollector oam;
3552
3553 int num_threads = tle.num_threads();
3554 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3555 objArrayHandle threads_ah(THREAD, r);
3556
3557 for (int i = 0; i < num_threads; i++) {
3558 Handle h = tle.get_threadObj(i);
3559 threads_ah->obj_at_put(i, h());
3560 }
3561
3562 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3563 JVM_END
3564
3565
3566 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3567 // Return StackTraceElement[][], each element is the stack trace of a thread in
3568 // the corresponding entry in the given threads array
3569 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3570 JVMWrapper("JVM_DumpThreads");
3571 JvmtiVMObjectAllocEventCollector oam;
3572
3573 // Check if threads is null
3574 if (threads == NULL) {
3575 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3576 }
3577
3578 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3579 objArrayHandle ah(THREAD, a);
3580 int num_threads = ah->length();
3581 // check if threads is non-empty array
3582 if (num_threads == 0) {
3583 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3584 }
3585
3586 // check if threads is not an array of objects of Thread class
3587 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3588 if (k != SystemDictionary::Thread_klass()) {
3589 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3590 }
3591
3592 ResourceMark rm(THREAD);
3593
3594 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3595 for (int i = 0; i < num_threads; i++) {
3596 oop thread_obj = ah->obj_at(i);
3597 instanceHandle h(THREAD, (instanceOop) thread_obj);
3598 thread_handle_array->append(h);
3599 }
3600
3601 // The JavaThread references in thread_handle_array are validated
3602 // in VM_ThreadDump::doit().
3603 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3604 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3605
3606 JVM_END
3607
3608 // JVM monitoring and management support
3609 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3610 return Management::get_jmm_interface(version);
3611 JVM_END
3612
3613 // com.sun.tools.attach.VirtualMachine agent properties support
3614 //
3615 // Initialize the agent properties with the properties maintained in the VM
3616 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3617 JVMWrapper("JVM_InitAgentProperties");
3618 ResourceMark rm;
3619
3620 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3621
3622 PUTPROP(props, "sun.java.command", Arguments::java_command());
3623 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3624 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3625 return properties;
3626 JVM_END
3627
3628 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3629 {
3630 JVMWrapper("JVM_GetEnclosingMethodInfo");
3631 JvmtiVMObjectAllocEventCollector oam;
3632
3633 if (ofClass == NULL) {
3634 return NULL;
3635 }
3636 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3637 // Special handling for primitive objects
3638 if (java_lang_Class::is_primitive(mirror())) {
3639 return NULL;
3640 }
3641 Klass* k = java_lang_Class::as_Klass(mirror());
3642 if (!k->is_instance_klass()) {
3643 return NULL;
3644 }
3645 InstanceKlass* ik = InstanceKlass::cast(k);
3646 int encl_method_class_idx = ik->enclosing_method_class_index();
3647 if (encl_method_class_idx == 0) {
3648 return NULL;
3649 }
3650 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3651 objArrayHandle dest(THREAD, dest_o);
3652 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3653 dest->obj_at_put(0, enc_k->java_mirror());
3654 int encl_method_method_idx = ik->enclosing_method_method_index();
3655 if (encl_method_method_idx != 0) {
3656 Symbol* sym = ik->constants()->symbol_at(
3657 extract_low_short_from_int(
3658 ik->constants()->name_and_type_at(encl_method_method_idx)));
3659 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3660 dest->obj_at_put(1, str());
3661 sym = ik->constants()->symbol_at(
3662 extract_high_short_from_int(
3663 ik->constants()->name_and_type_at(encl_method_method_idx)));
3664 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3665 dest->obj_at_put(2, str());
3666 }
3667 return (jobjectArray) JNIHandles::make_local(dest());
3668 }
3669 JVM_END
3670
3671 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3672 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3673 ResourceMark rm(THREAD);
3674
3675 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3676 return NULL;
3677 }
3678
3679 char** vm_flags = Arguments::jvm_flags_array();
3680 char** vm_args = Arguments::jvm_args_array();
3681 int num_flags = Arguments::num_jvm_flags();
3682 int num_args = Arguments::num_jvm_args();
3683
3684 InstanceKlass* ik = SystemDictionary::String_klass();
3685 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3686 objArrayHandle result_h(THREAD, r);
3687
3688 int index = 0;
3689 for (int j = 0; j < num_flags; j++, index++) {
3690 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3691 result_h->obj_at_put(index, h());
3692 }
3693 for (int i = 0; i < num_args; i++, index++) {
3694 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3695 result_h->obj_at_put(index, h());
3696 }
3697 return (jobjectArray) JNIHandles::make_local(env, result_h());
3698 JVM_END
3699
3700 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3701 return os::get_signal_number(name);
3702 JVM_END