1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/modules.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/stringTable.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "gc/shared/collectedHeap.inline.hpp"
40 #include "interpreter/bytecode.hpp"
41 #include "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/synchronizer.hpp"
78 #include "runtime/thread.inline.hpp"
79 #include "runtime/threadSMR.hpp"
80 #include "runtime/vframe.inline.hpp"
81 #include "runtime/vmOperations.hpp"
82 #include "runtime/vm_version.hpp"
83 #include "services/attachListener.hpp"
84 #include "services/management.hpp"
85 #include "services/threadService.hpp"
86 #include "utilities/copy.hpp"
87 #include "utilities/defaultStream.hpp"
88 #include "utilities/dtrace.hpp"
89 #include "utilities/events.hpp"
90 #include "utilities/histogram.hpp"
91 #include "utilities/macros.hpp"
92 #include "utilities/utf8.hpp"
93 #if INCLUDE_CDS
94 #include "classfile/systemDictionaryShared.hpp"
95 #endif
96
97 #include <errno.h>
98
99 /*
100 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
101 such ctors and calls MUST NOT come between an oop declaration/init and its
102 usage because if objects are move this may cause various memory stomps, bus
103 errors and segfaults. Here is a cookbook for causing so called "naked oop
104 failures":
105
106 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
107 JVMWrapper("JVM_GetClassDeclaredFields");
108
109 // Object address to be held directly in mirror & not visible to GC
110 oop mirror = JNIHandles::resolve_non_null(ofClass);
111
112 // If this ctor can hit a safepoint, moving objects around, then
113 ComplexConstructor foo;
114
115 // Boom! mirror may point to JUNK instead of the intended object
116 (some dereference of mirror)
117
118 // Here's another call that may block for GC, making mirror stale
119 MutexLocker ml(some_lock);
120
121 // And here's an initializer that can result in a stale oop
122 // all in one step.
123 oop o = call_that_can_throw_exception(TRAPS);
124
125
126 The solution is to keep the oop declaration BELOW the ctor or function
127 call that might cause a GC, do another resolve to reassign the oop, or
128 consider use of a Handle instead of an oop so there is immunity from object
129 motion. But note that the "QUICK" entries below do not have a handlemark
130 and thus can only support use of handles passed in.
131 */
132
133 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
134 ResourceMark rm;
135 int line_number = -1;
136 const char * source_file = NULL;
137 const char * trace = "explicit";
138 InstanceKlass* caller = NULL;
139 JavaThread* jthread = JavaThread::current();
140 if (jthread->has_last_Java_frame()) {
141 vframeStream vfst(jthread);
142
143 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
144 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
145 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
146 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
147 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
148
149 Method* last_caller = NULL;
150
151 while (!vfst.at_end()) {
152 Method* m = vfst.method();
153 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
154 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
155 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
156 break;
157 }
158 last_caller = m;
159 vfst.next();
160 }
161 // if this is called from Class.forName0 and that is called from Class.forName,
162 // then print the caller of Class.forName. If this is Class.loadClass, then print
163 // that caller, otherwise keep quiet since this should be picked up elsewhere.
164 bool found_it = false;
165 if (!vfst.at_end() &&
166 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
167 vfst.method()->name() == vmSymbols::forName0_name()) {
168 vfst.next();
169 if (!vfst.at_end() &&
170 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
171 vfst.method()->name() == vmSymbols::forName_name()) {
172 vfst.next();
173 found_it = true;
174 }
175 } else if (last_caller != NULL &&
176 last_caller->method_holder()->name() ==
177 vmSymbols::java_lang_ClassLoader() &&
178 last_caller->name() == vmSymbols::loadClass_name()) {
179 found_it = true;
180 } else if (!vfst.at_end()) {
181 if (vfst.method()->is_native()) {
182 // JNI call
183 found_it = true;
184 }
185 }
186 if (found_it && !vfst.at_end()) {
187 // found the caller
188 caller = vfst.method()->method_holder();
189 line_number = vfst.method()->line_number_from_bci(vfst.bci());
190 if (line_number == -1) {
191 // show method name if it's a native method
192 trace = vfst.method()->name_and_sig_as_C_string();
193 }
194 Symbol* s = caller->source_file_name();
195 if (s != NULL) {
196 source_file = s->as_C_string();
197 }
198 }
199 }
200 if (caller != NULL) {
201 if (to_class != caller) {
202 const char * from = caller->external_name();
203 const char * to = to_class->external_name();
204 // print in a single call to reduce interleaving between threads
205 if (source_file != NULL) {
206 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
207 } else {
208 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
209 }
210 }
211 }
212 }
213
214 void trace_class_resolution(Klass* to_class) {
215 EXCEPTION_MARK;
216 trace_class_resolution_impl(to_class, THREAD);
217 if (HAS_PENDING_EXCEPTION) {
218 CLEAR_PENDING_EXCEPTION;
219 }
220 }
221
222 // Wrapper to trace JVM functions
223
224 #ifdef ASSERT
225 Histogram* JVMHistogram;
226 volatile int JVMHistogram_lock = 0;
227
228 class JVMHistogramElement : public HistogramElement {
229 public:
230 JVMHistogramElement(const char* name);
231 };
232
233 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
234 _name = elementName;
235 uintx count = 0;
236
237 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) {
238 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) {
239 count +=1;
240 if ( (WarnOnStalledSpinLock > 0)
241 && (count % WarnOnStalledSpinLock == 0)) {
242 warning("JVMHistogram_lock seems to be stalled");
243 }
244 }
245 }
246
247 if(JVMHistogram == NULL)
248 JVMHistogram = new Histogram("JVM Call Counts",100);
249
250 JVMHistogram->add_element(this);
251 Atomic::dec(&JVMHistogram_lock);
252 }
253
254 #define JVMCountWrapper(arg) \
255 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
256 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
257
258 #define JVMWrapper(arg) JVMCountWrapper(arg);
259 #else
260 #define JVMWrapper(arg)
261 #endif
262
263
264 // Interface version /////////////////////////////////////////////////////////////////////
265
266
267 JVM_LEAF(jint, JVM_GetInterfaceVersion())
268 return JVM_INTERFACE_VERSION;
269 JVM_END
270
271
272 // java.lang.System //////////////////////////////////////////////////////////////////////
273
274
275 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
276 JVMWrapper("JVM_CurrentTimeMillis");
277 return os::javaTimeMillis();
278 JVM_END
279
280 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
281 JVMWrapper("JVM_NanoTime");
282 return os::javaTimeNanos();
283 JVM_END
284
285 // The function below is actually exposed by jdk.internal.misc.VM and not
286 // java.lang.System, but we choose to keep it here so that it stays next
287 // to JVM_CurrentTimeMillis and JVM_NanoTime
288
289 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
290 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
291
292 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
293 JVMWrapper("JVM_GetNanoTimeAdjustment");
294 jlong seconds;
295 jlong nanos;
296
297 os::javaTimeSystemUTC(seconds, nanos);
298
299 // We're going to verify that the result can fit in a long.
300 // For that we need the difference in seconds between 'seconds'
301 // and 'offset_secs' to be such that:
302 // |seconds - offset_secs| < (2^63/10^9)
303 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
304 // which makes |seconds - offset_secs| < 2^33
305 // and we will prefer +/- 2^32 as the maximum acceptable diff
306 // as 2^32 has a more natural feel than 2^33...
307 //
308 // So if |seconds - offset_secs| >= 2^32 - we return a special
309 // sentinel value (-1) which the caller should take as an
310 // exception value indicating that the offset given to us is
311 // too far from range of the current time - leading to too big
312 // a nano adjustment. The caller is expected to recover by
313 // computing a more accurate offset and calling this method
314 // again. (For the record 2^32 secs is ~136 years, so that
315 // should rarely happen)
316 //
317 jlong diff = seconds - offset_secs;
318 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
319 return -1; // sentinel value: the offset is too far off the target
320 }
321
322 // return the adjustment. If you compute a time by adding
323 // this number of nanoseconds along with the number of seconds
324 // in the offset you should get the current UTC time.
325 return (diff * (jlong)1000000000) + nanos;
326 JVM_END
327
328 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
329 jobject dst, jint dst_pos, jint length))
330 JVMWrapper("JVM_ArrayCopy");
331 // Check if we have null pointers
332 if (src == NULL || dst == NULL) {
333 THROW(vmSymbols::java_lang_NullPointerException());
334 }
335 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
336 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
337 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
338 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
339 // Do copy
340 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
341 JVM_END
342
343
344 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
345 JavaValue r(T_OBJECT);
346 // public synchronized Object put(Object key, Object value);
347 HandleMark hm(THREAD);
348 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
349 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
350 JavaCalls::call_virtual(&r,
351 props,
352 SystemDictionary::Properties_klass(),
353 vmSymbols::put_name(),
354 vmSymbols::object_object_object_signature(),
355 key_str,
356 value_str,
357 THREAD);
358 }
359
360
361 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
362
363 /*
364 * Return all of the system properties in a Java String array with alternating
365 * names and values from the jvm SystemProperty.
366 * Which includes some internal and all commandline -D defined properties.
367 */
368 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
369 JVMWrapper("JVM_GetProperties");
370 ResourceMark rm(THREAD);
371 HandleMark hm(THREAD);
372 int ndx = 0;
373 int fixedCount = 2;
374
375 SystemProperty* p = Arguments::system_properties();
376 int count = Arguments::PropertyList_count(p);
377
378 // Allocate result String array
379 InstanceKlass* ik = SystemDictionary::String_klass();
380 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
381 objArrayHandle result_h(THREAD, r);
382
383 while (p != NULL) {
384 const char * key = p->key();
385 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
386 const char * value = p->value();
387 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
388 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
389 result_h->obj_at_put(ndx * 2, key_str());
390 result_h->obj_at_put(ndx * 2 + 1, value_str());
391 ndx++;
392 }
393 p = p->next();
394 }
395
396 // Convert the -XX:MaxDirectMemorySize= command line flag
397 // to the sun.nio.MaxDirectMemorySize property.
398 // Do this after setting user properties to prevent people
399 // from setting the value with a -D option, as requested.
400 // Leave empty if not supplied
401 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
402 char as_chars[256];
403 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
404 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
405 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
406 result_h->obj_at_put(ndx * 2, key_str());
407 result_h->obj_at_put(ndx * 2 + 1, value_str());
408 ndx++;
409 }
410
411 // JVM monitoring and management support
412 // Add the sun.management.compiler property for the compiler's name
413 {
414 #undef CSIZE
415 #if defined(_LP64) || defined(_WIN64)
416 #define CSIZE "64-Bit "
417 #else
418 #define CSIZE
419 #endif // 64bit
420
421 #ifdef TIERED
422 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
423 #else
424 #if defined(COMPILER1)
425 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
426 #elif defined(COMPILER2)
427 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
428 #elif INCLUDE_JVMCI
429 #error "INCLUDE_JVMCI should imply TIERED"
430 #else
431 const char* compiler_name = "";
432 #endif // compilers
433 #endif // TIERED
434
435 if (*compiler_name != '\0' &&
436 (Arguments::mode() != Arguments::_int)) {
437 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
438 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
439 result_h->obj_at_put(ndx * 2, key_str());
440 result_h->obj_at_put(ndx * 2 + 1, value_str());
441 ndx++;
442 }
443 }
444
445 return (jobjectArray) JNIHandles::make_local(env, result_h());
446 JVM_END
447
448
449 /*
450 * Return the temporary directory that the VM uses for the attach
451 * and perf data files.
452 *
453 * It is important that this directory is well-known and the
454 * same for all VM instances. It cannot be affected by configuration
455 * variables such as java.io.tmpdir.
456 */
457 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
458 JVMWrapper("JVM_GetTemporaryDirectory");
459 HandleMark hm(THREAD);
460 const char* temp_dir = os::get_temp_directory();
461 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
462 return (jstring) JNIHandles::make_local(env, h());
463 JVM_END
464
465
466 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
467
468 extern volatile jint vm_created;
469
470 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
471 JVMWrapper("JVM_BeforeHalt");
472 EventShutdown event;
473 if (event.should_commit()) {
474 event.set_reason("Shutdown requested from Java");
475 event.commit();
476 }
477 JVM_END
478
479
480 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
481 before_exit(thread);
482 vm_exit(code);
483 JVM_END
484
485
486 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
487 JVMWrapper("JVM_GC");
488 if (!DisableExplicitGC) {
489 if (AsyncDeflateIdleMonitors) {
490 // AsyncDeflateIdleMonitors needs to know when System.gc() is
491 // called so any special deflation can be done at a safepoint.
492 ObjectSynchronizer::set_is_special_deflation_requested(true);
493 }
494 Universe::heap()->collect(GCCause::_java_lang_system_gc);
495 }
496 JVM_END
497
498
499 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
500 JVMWrapper("JVM_MaxObjectInspectionAge");
501 return Universe::heap()->millis_since_last_gc();
502 JVM_END
503
504
505 static inline jlong convert_size_t_to_jlong(size_t val) {
506 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
507 NOT_LP64 (return (jlong)val;)
508 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
509 }
510
511 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
512 JVMWrapper("JVM_TotalMemory");
513 size_t n = Universe::heap()->capacity();
514 return convert_size_t_to_jlong(n);
515 JVM_END
516
517
518 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
519 JVMWrapper("JVM_FreeMemory");
520 size_t n = Universe::heap()->unused();
521 return convert_size_t_to_jlong(n);
522 JVM_END
523
524
525 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
526 JVMWrapper("JVM_MaxMemory");
527 size_t n = Universe::heap()->max_capacity();
528 return convert_size_t_to_jlong(n);
529 JVM_END
530
531
532 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
533 JVMWrapper("JVM_ActiveProcessorCount");
534 return os::active_processor_count();
535 JVM_END
536
537
538
539 // java.lang.Throwable //////////////////////////////////////////////////////
540
541 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
542 JVMWrapper("JVM_FillInStackTrace");
543 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
544 java_lang_Throwable::fill_in_stack_trace(exception);
545 JVM_END
546
547 // java.lang.NullPointerException ///////////////////////////////////////////
548
549 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
550 if (!ShowCodeDetailsInExceptionMessages) return NULL;
551
552 oop exc = JNIHandles::resolve_non_null(throwable);
553
554 Method* method;
555 int bci;
556 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
557 return NULL;
558 }
559 if (method->is_native()) {
560 return NULL;
561 }
562
563 stringStream ss;
564 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
565 if (ok) {
566 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_0);
567 return (jstring) JNIHandles::make_local(env, result);
568 } else {
569 return NULL;
570 }
571 JVM_END
572
573 // java.lang.StackTraceElement //////////////////////////////////////////////
574
575
576 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
577 JVMWrapper("JVM_InitStackTraceElementArray");
578 Handle exception(THREAD, JNIHandles::resolve(throwable));
579 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
580 objArrayHandle stack_trace(THREAD, st);
581 // Fill in the allocated stack trace
582 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
583 JVM_END
584
585
586 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
587 JVMWrapper("JVM_InitStackTraceElement");
588 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
589 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
590 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
591 JVM_END
592
593
594 // java.lang.StackWalker //////////////////////////////////////////////////////
595
596
597 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
598 jint skip_frames, jint frame_count, jint start_index,
599 jobjectArray frames))
600 JVMWrapper("JVM_CallStackWalk");
601 JavaThread* jt = (JavaThread*) THREAD;
602 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
603 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
604 }
605
606 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
607
608 // frames array is a Class<?>[] array when only getting caller reference,
609 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
610 // be null.
611 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
612 objArrayHandle frames_array_h(THREAD, fa);
613
614 int limit = start_index + frame_count;
615 if (frames_array_h->length() < limit) {
616 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
617 }
618
619 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
620 start_index, frames_array_h, CHECK_NULL);
621 return JNIHandles::make_local(env, result);
622 JVM_END
623
624
625 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
626 jint frame_count, jint start_index,
627 jobjectArray frames))
628 JVMWrapper("JVM_MoreStackWalk");
629 JavaThread* jt = (JavaThread*) THREAD;
630
631 // frames array is a Class<?>[] array when only getting caller reference,
632 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
633 // be null.
634 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
635 objArrayHandle frames_array_h(THREAD, fa);
636
637 int limit = start_index+frame_count;
638 if (frames_array_h->length() < limit) {
639 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
640 }
641
642 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
643 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
644 start_index, frames_array_h, THREAD);
645 JVM_END
646
647 // java.lang.Object ///////////////////////////////////////////////
648
649
650 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
651 JVMWrapper("JVM_IHashCode");
652 // as implemented in the classic virtual machine; return 0 if object is NULL
653 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
654 JVM_END
655
656
657 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
658 JVMWrapper("JVM_MonitorWait");
659 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
660 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
661 if (JvmtiExport::should_post_monitor_wait()) {
662 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
663
664 // The current thread already owns the monitor and it has not yet
665 // been added to the wait queue so the current thread cannot be
666 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
667 // event handler cannot accidentally consume an unpark() meant for
668 // the ParkEvent associated with this ObjectMonitor.
669 }
670 ObjectSynchronizer::wait(obj, ms, CHECK);
671 JVM_END
672
673
674 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
675 JVMWrapper("JVM_MonitorNotify");
676 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
677 ObjectSynchronizer::notify(obj, CHECK);
678 JVM_END
679
680
681 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
682 JVMWrapper("JVM_MonitorNotifyAll");
683 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
684 ObjectSynchronizer::notifyall(obj, CHECK);
685 JVM_END
686
687
688 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
689 JVMWrapper("JVM_Clone");
690 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
691 Klass* klass = obj->klass();
692 JvmtiVMObjectAllocEventCollector oam;
693
694 #ifdef ASSERT
695 // Just checking that the cloneable flag is set correct
696 if (obj->is_array()) {
697 guarantee(klass->is_cloneable(), "all arrays are cloneable");
698 } else {
699 guarantee(obj->is_instance(), "should be instanceOop");
700 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
701 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
702 }
703 #endif
704
705 // Check if class of obj supports the Cloneable interface.
706 // All arrays are considered to be cloneable (See JLS 20.1.5).
707 // All j.l.r.Reference classes are considered non-cloneable.
708 if (!klass->is_cloneable() ||
709 (klass->is_instance_klass() &&
710 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
711 ResourceMark rm(THREAD);
712 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
713 }
714
715 // Make shallow object copy
716 const int size = obj->size();
717 oop new_obj_oop = NULL;
718 if (obj->is_array()) {
719 const int length = ((arrayOop)obj())->length();
720 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
721 /* do_zero */ true, CHECK_NULL);
722 } else {
723 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
724 }
725
726 HeapAccess<>::clone(obj(), new_obj_oop, size);
727
728 Handle new_obj(THREAD, new_obj_oop);
729 // Caution: this involves a java upcall, so the clone should be
730 // "gc-robust" by this stage.
731 if (klass->has_finalizer()) {
732 assert(obj->is_instance(), "should be instanceOop");
733 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
734 new_obj = Handle(THREAD, new_obj_oop);
735 }
736
737 return JNIHandles::make_local(env, new_obj());
738 JVM_END
739
740 // java.io.File ///////////////////////////////////////////////////////////////
741
742 JVM_LEAF(char*, JVM_NativePath(char* path))
743 JVMWrapper("JVM_NativePath");
744 return os::native_path(path);
745 JVM_END
746
747
748 // Misc. class handling ///////////////////////////////////////////////////////////
749
750
751 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
752 JVMWrapper("JVM_GetCallerClass");
753
754 // Getting the class of the caller frame.
755 //
756 // The call stack at this point looks something like this:
757 //
758 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
759 // [1] [ @CallerSensitive API.method ]
760 // [.] [ (skipped intermediate frames) ]
761 // [n] [ caller ]
762 vframeStream vfst(thread);
763 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
764 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
765 Method* m = vfst.method();
766 assert(m != NULL, "sanity");
767 switch (n) {
768 case 0:
769 // This must only be called from Reflection.getCallerClass
770 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
771 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
772 }
773 // fall-through
774 case 1:
775 // Frame 0 and 1 must be caller sensitive.
776 if (!m->caller_sensitive()) {
777 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
778 }
779 break;
780 default:
781 if (!m->is_ignored_by_security_stack_walk()) {
782 // We have reached the desired frame; return the holder class.
783 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
784 }
785 break;
786 }
787 }
788 return NULL;
789 JVM_END
790
791
792 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
793 JVMWrapper("JVM_FindPrimitiveClass");
794 oop mirror = NULL;
795 BasicType t = name2type(utf);
796 if (t != T_ILLEGAL && !is_reference_type(t)) {
797 mirror = Universe::java_mirror(t);
798 }
799 if (mirror == NULL) {
800 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
801 } else {
802 return (jclass) JNIHandles::make_local(env, mirror);
803 }
804 JVM_END
805
806
807 // Returns a class loaded by the bootstrap class loader; or null
808 // if not found. ClassNotFoundException is not thrown.
809 // FindClassFromBootLoader is exported to the launcher for windows.
810 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
811 const char* name))
812 JVMWrapper("JVM_FindClassFromBootLoader");
813
814 // Java libraries should ensure that name is never null...
815 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
816 // It's impossible to create this class; the name cannot fit
817 // into the constant pool.
818 return NULL;
819 }
820
821 TempNewSymbol h_name = SymbolTable::new_symbol(name);
822 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
823 if (k == NULL) {
824 return NULL;
825 }
826
827 if (log_is_enabled(Debug, class, resolve)) {
828 trace_class_resolution(k);
829 }
830 return (jclass) JNIHandles::make_local(env, k->java_mirror());
831 JVM_END
832
833 // Find a class with this name in this loader, using the caller's protection domain.
834 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
835 jboolean init, jobject loader,
836 jclass caller))
837 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
838 // Java libraries should ensure that name is never null...
839 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
840 // It's impossible to create this class; the name cannot fit
841 // into the constant pool.
842 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
843 }
844
845 TempNewSymbol h_name = SymbolTable::new_symbol(name);
846
847 oop loader_oop = JNIHandles::resolve(loader);
848 oop from_class = JNIHandles::resolve(caller);
849 oop protection_domain = NULL;
850 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
851 // NPE. Put it in another way, the bootstrap class loader has all permission and
852 // thus no checkPackageAccess equivalence in the VM class loader.
853 // The caller is also passed as NULL by the java code if there is no security
854 // manager to avoid the performance cost of getting the calling class.
855 if (from_class != NULL && loader_oop != NULL) {
856 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
857 }
858
859 Handle h_loader(THREAD, loader_oop);
860 Handle h_prot(THREAD, protection_domain);
861 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
862 h_prot, false, THREAD);
863
864 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
865 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
866 }
867 return result;
868 JVM_END
869
870 // Currently only called from the old verifier.
871 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
872 jboolean init, jclass from))
873 JVMWrapper("JVM_FindClassFromClass");
874 if (name == NULL) {
875 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
876 }
877 if ((int)strlen(name) > Symbol::max_length()) {
878 // It's impossible to create this class; the name cannot fit
879 // into the constant pool.
880 Exceptions::fthrow(THREAD_AND_LOCATION,
881 vmSymbols::java_lang_NoClassDefFoundError(),
882 "Class name exceeds maximum length of %d: %s",
883 Symbol::max_length(),
884 name);
885 return 0;
886 }
887 TempNewSymbol h_name = SymbolTable::new_symbol(name);
888 oop from_class_oop = JNIHandles::resolve(from);
889 Klass* from_class = (from_class_oop == NULL)
890 ? (Klass*)NULL
891 : java_lang_Class::as_Klass(from_class_oop);
892 oop class_loader = NULL;
893 oop protection_domain = NULL;
894 if (from_class != NULL) {
895 class_loader = from_class->class_loader();
896 protection_domain = from_class->protection_domain();
897 }
898 Handle h_loader(THREAD, class_loader);
899 Handle h_prot (THREAD, protection_domain);
900 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
901 h_prot, true, thread);
902
903 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
904 // this function is generally only used for class loading during verification.
905 ResourceMark rm;
906 oop from_mirror = JNIHandles::resolve_non_null(from);
907 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
908 const char * from_name = from_class->external_name();
909
910 oop mirror = JNIHandles::resolve_non_null(result);
911 Klass* to_class = java_lang_Class::as_Klass(mirror);
912 const char * to = to_class->external_name();
913 log_debug(class, resolve)("%s %s (verification)", from_name, to);
914 }
915
916 return result;
917 JVM_END
918
919 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
920 if (loader.is_null()) {
921 return;
922 }
923
924 // check whether the current caller thread holds the lock or not.
925 // If not, increment the corresponding counter
926 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
927 ObjectSynchronizer::owner_self) {
928 counter->inc();
929 }
930 }
931
932 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
933 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
934 jobject loader, const jbyte *buf,
935 jsize len, jobject pd, const char *source,
936 TRAPS) {
937 if (source == NULL) source = "__JVM_DefineClass__";
938
939 assert(THREAD->is_Java_thread(), "must be a JavaThread");
940 JavaThread* jt = (JavaThread*) THREAD;
941
942 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
943 ClassLoader::perf_define_appclass_selftime(),
944 ClassLoader::perf_define_appclasses(),
945 jt->get_thread_stat()->perf_recursion_counts_addr(),
946 jt->get_thread_stat()->perf_timers_addr(),
947 PerfClassTraceTime::DEFINE_CLASS);
948
949 if (UsePerfData) {
950 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
951 }
952
953 // Since exceptions can be thrown, class initialization can take place
954 // if name is NULL no check for class name in .class stream has to be made.
955 TempNewSymbol class_name = NULL;
956 if (name != NULL) {
957 const int str_len = (int)strlen(name);
958 if (str_len > Symbol::max_length()) {
959 // It's impossible to create this class; the name cannot fit
960 // into the constant pool.
961 Exceptions::fthrow(THREAD_AND_LOCATION,
962 vmSymbols::java_lang_NoClassDefFoundError(),
963 "Class name exceeds maximum length of %d: %s",
964 Symbol::max_length(),
965 name);
966 return 0;
967 }
968 class_name = SymbolTable::new_symbol(name, str_len);
969 }
970
971 ResourceMark rm(THREAD);
972 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
973 Handle class_loader (THREAD, JNIHandles::resolve(loader));
974 if (UsePerfData) {
975 is_lock_held_by_thread(class_loader,
976 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
977 THREAD);
978 }
979 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
980 Klass* k = SystemDictionary::resolve_from_stream(class_name,
981 class_loader,
982 protection_domain,
983 &st,
984 CHECK_NULL);
985
986 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
987 trace_class_resolution(k);
988 }
989
990 return (jclass) JNIHandles::make_local(env, k->java_mirror());
991 }
992
993
994 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
995 JVMWrapper("JVM_DefineClass");
996
997 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
998 JVM_END
999
1000
1001 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1002 JVMWrapper("JVM_DefineClassWithSource");
1003
1004 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
1005 JVM_END
1006
1007 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1008 JVMWrapper("JVM_FindLoadedClass");
1009 ResourceMark rm(THREAD);
1010
1011 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1012 char* str = java_lang_String::as_utf8_string(h_name());
1013
1014 // Sanity check, don't expect null
1015 if (str == NULL) return NULL;
1016
1017 // Internalize the string, converting '.' to '/' in string.
1018 char* p = (char*)str;
1019 while (*p != '\0') {
1020 if (*p == '.') {
1021 *p = '/';
1022 }
1023 p++;
1024 }
1025
1026 const int str_len = (int)(p - str);
1027 if (str_len > Symbol::max_length()) {
1028 // It's impossible to create this class; the name cannot fit
1029 // into the constant pool.
1030 return NULL;
1031 }
1032 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1033
1034 // Security Note:
1035 // The Java level wrapper will perform the necessary security check allowing
1036 // us to pass the NULL as the initiating class loader.
1037 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1038 if (UsePerfData) {
1039 is_lock_held_by_thread(h_loader,
1040 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1041 THREAD);
1042 }
1043
1044 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1045 h_loader,
1046 Handle(),
1047 CHECK_NULL);
1048 #if INCLUDE_CDS
1049 if (k == NULL) {
1050 // If the class is not already loaded, try to see if it's in the shared
1051 // archive for the current classloader (h_loader).
1052 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1053 }
1054 #endif
1055 return (k == NULL) ? NULL :
1056 (jclass) JNIHandles::make_local(env, k->java_mirror());
1057 JVM_END
1058
1059 // Module support //////////////////////////////////////////////////////////////////////////////
1060
1061 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1062 jstring location, const char* const* packages, jsize num_packages))
1063 JVMWrapper("JVM_DefineModule");
1064 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1065 JVM_END
1066
1067 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1068 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1069 Modules::set_bootloader_unnamed_module(module, CHECK);
1070 JVM_END
1071
1072 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1073 JVMWrapper("JVM_AddModuleExports");
1074 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1075 JVM_END
1076
1077 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1078 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1079 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1080 JVM_END
1081
1082 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1083 JVMWrapper("JVM_AddModuleExportsToAll");
1084 Modules::add_module_exports(from_module, package, NULL, CHECK);
1085 JVM_END
1086
1087 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1088 JVMWrapper("JVM_AddReadsModule");
1089 Modules::add_reads_module(from_module, source_module, CHECK);
1090 JVM_END
1091
1092 // Reflection support //////////////////////////////////////////////////////////////////////////////
1093
1094 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1095 assert (cls != NULL, "illegal class");
1096 JVMWrapper("JVM_InitClassName");
1097 JvmtiVMObjectAllocEventCollector oam;
1098 ResourceMark rm(THREAD);
1099 HandleMark hm(THREAD);
1100 Handle java_class(THREAD, JNIHandles::resolve(cls));
1101 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1102 return (jstring) JNIHandles::make_local(env, result);
1103 JVM_END
1104
1105
1106 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1107 JVMWrapper("JVM_GetClassInterfaces");
1108 JvmtiVMObjectAllocEventCollector oam;
1109 oop mirror = JNIHandles::resolve_non_null(cls);
1110
1111 // Special handling for primitive objects
1112 if (java_lang_Class::is_primitive(mirror)) {
1113 // Primitive objects does not have any interfaces
1114 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1115 return (jobjectArray) JNIHandles::make_local(env, r);
1116 }
1117
1118 Klass* klass = java_lang_Class::as_Klass(mirror);
1119 // Figure size of result array
1120 int size;
1121 if (klass->is_instance_klass()) {
1122 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1123 } else {
1124 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1125 size = 2;
1126 }
1127
1128 // Allocate result array
1129 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1130 objArrayHandle result (THREAD, r);
1131 // Fill in result
1132 if (klass->is_instance_klass()) {
1133 // Regular instance klass, fill in all local interfaces
1134 for (int index = 0; index < size; index++) {
1135 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1136 result->obj_at_put(index, k->java_mirror());
1137 }
1138 } else {
1139 // All arrays implement java.lang.Cloneable and java.io.Serializable
1140 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1141 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1142 }
1143 return (jobjectArray) JNIHandles::make_local(env, result());
1144 JVM_END
1145
1146
1147 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1148 JVMWrapper("JVM_IsInterface");
1149 oop mirror = JNIHandles::resolve_non_null(cls);
1150 if (java_lang_Class::is_primitive(mirror)) {
1151 return JNI_FALSE;
1152 }
1153 Klass* k = java_lang_Class::as_Klass(mirror);
1154 jboolean result = k->is_interface();
1155 assert(!result || k->is_instance_klass(),
1156 "all interfaces are instance types");
1157 // The compiler intrinsic for isInterface tests the
1158 // Klass::_access_flags bits in the same way.
1159 return result;
1160 JVM_END
1161
1162
1163 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1164 JVMWrapper("JVM_GetClassSigners");
1165 JvmtiVMObjectAllocEventCollector oam;
1166 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1167 // There are no signers for primitive types
1168 return NULL;
1169 }
1170
1171 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1172
1173 // If there are no signers set in the class, or if the class
1174 // is an array, return NULL.
1175 if (signers == NULL) return NULL;
1176
1177 // copy of the signers array
1178 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1179 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1180 for (int index = 0; index < signers->length(); index++) {
1181 signers_copy->obj_at_put(index, signers->obj_at(index));
1182 }
1183
1184 // return the copy
1185 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1186 JVM_END
1187
1188
1189 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1190 JVMWrapper("JVM_SetClassSigners");
1191 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1192 // This call is ignored for primitive types and arrays.
1193 // Signers are only set once, ClassLoader.java, and thus shouldn't
1194 // be called with an array. Only the bootstrap loader creates arrays.
1195 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1196 if (k->is_instance_klass()) {
1197 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1198 }
1199 }
1200 JVM_END
1201
1202
1203 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1204 JVMWrapper("JVM_GetProtectionDomain");
1205 if (JNIHandles::resolve(cls) == NULL) {
1206 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1207 }
1208
1209 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1210 // Primitive types does not have a protection domain.
1211 return NULL;
1212 }
1213
1214 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1215 return (jobject) JNIHandles::make_local(env, pd);
1216 JVM_END
1217
1218
1219 // Returns the inherited_access_control_context field of the running thread.
1220 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1221 JVMWrapper("JVM_GetInheritedAccessControlContext");
1222 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1223 return JNIHandles::make_local(env, result);
1224 JVM_END
1225
1226 class RegisterArrayForGC {
1227 private:
1228 JavaThread *_thread;
1229 public:
1230 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1231 _thread = thread;
1232 _thread->register_array_for_gc(array);
1233 }
1234
1235 ~RegisterArrayForGC() {
1236 _thread->register_array_for_gc(NULL);
1237 }
1238 };
1239
1240
1241 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1242 JVMWrapper("JVM_GetStackAccessControlContext");
1243 if (!UsePrivilegedStack) return NULL;
1244
1245 ResourceMark rm(THREAD);
1246 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1247 JvmtiVMObjectAllocEventCollector oam;
1248
1249 // count the protection domains on the execution stack. We collapse
1250 // duplicate consecutive protection domains into a single one, as
1251 // well as stopping when we hit a privileged frame.
1252
1253 oop previous_protection_domain = NULL;
1254 Handle privileged_context(thread, NULL);
1255 bool is_privileged = false;
1256 oop protection_domain = NULL;
1257
1258 // Iterate through Java frames
1259 vframeStream vfst(thread);
1260 for(; !vfst.at_end(); vfst.next()) {
1261 // get method of frame
1262 Method* method = vfst.method();
1263
1264 // stop at the first privileged frame
1265 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1266 method->name() == vmSymbols::executePrivileged_name())
1267 {
1268 // this frame is privileged
1269 is_privileged = true;
1270
1271 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1272
1273 StackValueCollection* locals = priv->locals();
1274 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1275 StackValue* clr_sv = locals->at(2); // Class<?> caller
1276 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1277 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1278 privileged_context = ctx_sv->get_obj();
1279 Handle caller = clr_sv->get_obj();
1280
1281 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1282 protection_domain = caller_klass->protection_domain();
1283 } else {
1284 protection_domain = method->method_holder()->protection_domain();
1285 }
1286
1287 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1288 local_array->push(protection_domain);
1289 previous_protection_domain = protection_domain;
1290 }
1291
1292 if (is_privileged) break;
1293 }
1294
1295
1296 // either all the domains on the stack were system domains, or
1297 // we had a privileged system domain
1298 if (local_array->is_empty()) {
1299 if (is_privileged && privileged_context.is_null()) return NULL;
1300
1301 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1302 return JNIHandles::make_local(env, result);
1303 }
1304
1305 // the resource area must be registered in case of a gc
1306 RegisterArrayForGC ragc(thread, local_array);
1307 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1308 local_array->length(), CHECK_NULL);
1309 objArrayHandle h_context(thread, context);
1310 for (int index = 0; index < local_array->length(); index++) {
1311 h_context->obj_at_put(index, local_array->at(index));
1312 }
1313
1314 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1315
1316 return JNIHandles::make_local(env, result);
1317 JVM_END
1318
1319
1320 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1321 JVMWrapper("JVM_IsArrayClass");
1322 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1323 return (k != NULL) && k->is_array_klass() ? true : false;
1324 JVM_END
1325
1326
1327 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1328 JVMWrapper("JVM_IsPrimitiveClass");
1329 oop mirror = JNIHandles::resolve_non_null(cls);
1330 return (jboolean) java_lang_Class::is_primitive(mirror);
1331 JVM_END
1332
1333
1334 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1335 JVMWrapper("JVM_GetClassModifiers");
1336 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1337 // Primitive type
1338 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1339 }
1340
1341 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1342 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1343 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1344 return k->modifier_flags();
1345 JVM_END
1346
1347
1348 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1349
1350 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1351 JvmtiVMObjectAllocEventCollector oam;
1352 // ofClass is a reference to a java_lang_Class object. The mirror object
1353 // of an InstanceKlass
1354
1355 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1356 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1357 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1358 return (jobjectArray)JNIHandles::make_local(env, result);
1359 }
1360
1361 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1362 InnerClassesIterator iter(k);
1363
1364 if (iter.length() == 0) {
1365 // Neither an inner nor outer class
1366 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1367 return (jobjectArray)JNIHandles::make_local(env, result);
1368 }
1369
1370 // find inner class info
1371 constantPoolHandle cp(thread, k->constants());
1372 int length = iter.length();
1373
1374 // Allocate temp. result array
1375 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1376 objArrayHandle result (THREAD, r);
1377 int members = 0;
1378
1379 for (; !iter.done(); iter.next()) {
1380 int ioff = iter.inner_class_info_index();
1381 int ooff = iter.outer_class_info_index();
1382
1383 if (ioff != 0 && ooff != 0) {
1384 // Check to see if the name matches the class we're looking for
1385 // before attempting to find the class.
1386 if (cp->klass_name_at_matches(k, ooff)) {
1387 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1388 if (outer_klass == k) {
1389 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1390 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1391
1392 // Throws an exception if outer klass has not declared k as
1393 // an inner klass
1394 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1395
1396 result->obj_at_put(members, inner_klass->java_mirror());
1397 members++;
1398 }
1399 }
1400 }
1401 }
1402
1403 if (members != length) {
1404 // Return array of right length
1405 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1406 for(int i = 0; i < members; i++) {
1407 res->obj_at_put(i, result->obj_at(i));
1408 }
1409 return (jobjectArray)JNIHandles::make_local(env, res);
1410 }
1411
1412 return (jobjectArray)JNIHandles::make_local(env, result());
1413 JVM_END
1414
1415
1416 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1417 {
1418 // ofClass is a reference to a java_lang_Class object.
1419 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1420 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1421 return NULL;
1422 }
1423
1424 bool inner_is_member = false;
1425 Klass* outer_klass
1426 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1427 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1428 if (outer_klass == NULL) return NULL; // already a top-level class
1429 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1430 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1431 }
1432 JVM_END
1433
1434 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1435 {
1436 oop mirror = JNIHandles::resolve_non_null(cls);
1437 if (java_lang_Class::is_primitive(mirror) ||
1438 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1439 return NULL;
1440 }
1441 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1442 int ooff = 0, noff = 0;
1443 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1444 if (noff != 0) {
1445 constantPoolHandle i_cp(thread, k->constants());
1446 Symbol* name = i_cp->symbol_at(noff);
1447 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1448 return (jstring) JNIHandles::make_local(env, str());
1449 }
1450 }
1451 return NULL;
1452 }
1453 JVM_END
1454
1455 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1456 assert (cls != NULL, "illegal class");
1457 JVMWrapper("JVM_GetClassSignature");
1458 JvmtiVMObjectAllocEventCollector oam;
1459 ResourceMark rm(THREAD);
1460 // Return null for arrays and primatives
1461 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1462 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1463 if (k->is_instance_klass()) {
1464 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1465 if (sym == NULL) return NULL;
1466 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1467 return (jstring) JNIHandles::make_local(env, str());
1468 }
1469 }
1470 return NULL;
1471 JVM_END
1472
1473
1474 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1475 assert (cls != NULL, "illegal class");
1476 JVMWrapper("JVM_GetClassAnnotations");
1477
1478 // Return null for arrays and primitives
1479 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1480 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1481 if (k->is_instance_klass()) {
1482 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1483 return (jbyteArray) JNIHandles::make_local(env, a);
1484 }
1485 }
1486 return NULL;
1487 JVM_END
1488
1489
1490 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1491 // some of this code was adapted from from jni_FromReflectedField
1492
1493 oop reflected = JNIHandles::resolve_non_null(field);
1494 oop mirror = java_lang_reflect_Field::clazz(reflected);
1495 Klass* k = java_lang_Class::as_Klass(mirror);
1496 int slot = java_lang_reflect_Field::slot(reflected);
1497 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1498
1499 InstanceKlass* ik = InstanceKlass::cast(k);
1500 intptr_t offset = ik->field_offset(slot);
1501
1502 if (modifiers & JVM_ACC_STATIC) {
1503 // for static fields we only look in the current class
1504 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1505 assert(false, "cannot find static field");
1506 return false;
1507 }
1508 } else {
1509 // for instance fields we start with the current class and work
1510 // our way up through the superclass chain
1511 if (!ik->find_field_from_offset(offset, false, &fd)) {
1512 assert(false, "cannot find instance field");
1513 return false;
1514 }
1515 }
1516 return true;
1517 }
1518
1519 static Method* jvm_get_method_common(jobject method) {
1520 // some of this code was adapted from from jni_FromReflectedMethod
1521
1522 oop reflected = JNIHandles::resolve_non_null(method);
1523 oop mirror = NULL;
1524 int slot = 0;
1525
1526 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1527 mirror = java_lang_reflect_Constructor::clazz(reflected);
1528 slot = java_lang_reflect_Constructor::slot(reflected);
1529 } else {
1530 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1531 "wrong type");
1532 mirror = java_lang_reflect_Method::clazz(reflected);
1533 slot = java_lang_reflect_Method::slot(reflected);
1534 }
1535 Klass* k = java_lang_Class::as_Klass(mirror);
1536
1537 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1538 assert(m != NULL, "cannot find method");
1539 return m; // caller has to deal with NULL in product mode
1540 }
1541
1542 /* Type use annotations support (JDK 1.8) */
1543
1544 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1545 assert (cls != NULL, "illegal class");
1546 JVMWrapper("JVM_GetClassTypeAnnotations");
1547 ResourceMark rm(THREAD);
1548 // Return null for arrays and primitives
1549 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1550 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1551 if (k->is_instance_klass()) {
1552 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1553 if (type_annotations != NULL) {
1554 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1555 return (jbyteArray) JNIHandles::make_local(env, a);
1556 }
1557 }
1558 }
1559 return NULL;
1560 JVM_END
1561
1562 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1563 assert (method != NULL, "illegal method");
1564 JVMWrapper("JVM_GetMethodTypeAnnotations");
1565
1566 // method is a handle to a java.lang.reflect.Method object
1567 Method* m = jvm_get_method_common(method);
1568 if (m == NULL) {
1569 return NULL;
1570 }
1571
1572 AnnotationArray* type_annotations = m->type_annotations();
1573 if (type_annotations != NULL) {
1574 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1575 return (jbyteArray) JNIHandles::make_local(env, a);
1576 }
1577
1578 return NULL;
1579 JVM_END
1580
1581 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1582 assert (field != NULL, "illegal field");
1583 JVMWrapper("JVM_GetFieldTypeAnnotations");
1584
1585 fieldDescriptor fd;
1586 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1587 if (!gotFd) {
1588 return NULL;
1589 }
1590
1591 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1592 JVM_END
1593
1594 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1595 if (!cp->is_within_bounds(index)) {
1596 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1597 }
1598 }
1599
1600 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1601 {
1602 JVMWrapper("JVM_GetMethodParameters");
1603 // method is a handle to a java.lang.reflect.Method object
1604 Method* method_ptr = jvm_get_method_common(method);
1605 methodHandle mh (THREAD, method_ptr);
1606 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1607 const int num_params = mh->method_parameters_length();
1608
1609 if (num_params < 0) {
1610 // A -1 return value from method_parameters_length means there is no
1611 // parameter data. Return null to indicate this to the reflection
1612 // API.
1613 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1614 return (jobjectArray)NULL;
1615 } else {
1616 // Otherwise, we return something up to reflection, even if it is
1617 // a zero-length array. Why? Because in some cases this can
1618 // trigger a MalformedParametersException.
1619
1620 // make sure all the symbols are properly formatted
1621 for (int i = 0; i < num_params; i++) {
1622 MethodParametersElement* params = mh->method_parameters_start();
1623 int index = params[i].name_cp_index;
1624 constantPoolHandle cp(THREAD, mh->constants());
1625 bounds_check(cp, index, CHECK_NULL);
1626
1627 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1628 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1629 "Wrong type at constant pool index");
1630 }
1631
1632 }
1633
1634 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1635 objArrayHandle result (THREAD, result_oop);
1636
1637 for (int i = 0; i < num_params; i++) {
1638 MethodParametersElement* params = mh->method_parameters_start();
1639 // For a 0 index, give a NULL symbol
1640 Symbol* sym = 0 != params[i].name_cp_index ?
1641 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1642 int flags = params[i].flags;
1643 oop param = Reflection::new_parameter(reflected_method, i, sym,
1644 flags, CHECK_NULL);
1645 result->obj_at_put(i, param);
1646 }
1647 return (jobjectArray)JNIHandles::make_local(env, result());
1648 }
1649 }
1650 JVM_END
1651
1652 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1653
1654 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1655 {
1656 JVMWrapper("JVM_GetClassDeclaredFields");
1657 JvmtiVMObjectAllocEventCollector oam;
1658
1659 // Exclude primitive types and array types
1660 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1661 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1662 // Return empty array
1663 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1664 return (jobjectArray) JNIHandles::make_local(env, res);
1665 }
1666
1667 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1668 constantPoolHandle cp(THREAD, k->constants());
1669
1670 // Ensure class is linked
1671 k->link_class(CHECK_NULL);
1672
1673 // Allocate result
1674 int num_fields;
1675
1676 if (publicOnly) {
1677 num_fields = 0;
1678 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1679 if (fs.access_flags().is_public()) ++num_fields;
1680 }
1681 } else {
1682 num_fields = k->java_fields_count();
1683 }
1684
1685 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1686 objArrayHandle result (THREAD, r);
1687
1688 int out_idx = 0;
1689 fieldDescriptor fd;
1690 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1691 if (!publicOnly || fs.access_flags().is_public()) {
1692 fd.reinitialize(k, fs.index());
1693 oop field = Reflection::new_field(&fd, CHECK_NULL);
1694 result->obj_at_put(out_idx, field);
1695 ++out_idx;
1696 }
1697 }
1698 assert(out_idx == num_fields, "just checking");
1699 return (jobjectArray) JNIHandles::make_local(env, result());
1700 }
1701 JVM_END
1702
1703 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1704 {
1705 JVMWrapper("JVM_IsRecord");
1706 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1707 if (k != NULL && k->is_instance_klass()) {
1708 InstanceKlass* ik = InstanceKlass::cast(k);
1709 return ik->is_record();
1710 } else {
1711 return false;
1712 }
1713 }
1714 JVM_END
1715
1716 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1717 {
1718 JVMWrapper("JVM_GetRecordComponents");
1719 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1720 assert(c->is_instance_klass(), "must be");
1721 InstanceKlass* ik = InstanceKlass::cast(c);
1722
1723 if (ik->is_record()) {
1724 Array<RecordComponent*>* components = ik->record_components();
1725 assert(components != NULL, "components should not be NULL");
1726 {
1727 JvmtiVMObjectAllocEventCollector oam;
1728 constantPoolHandle cp(THREAD, ik->constants());
1729 int length = components->length();
1730 assert(length >= 0, "unexpected record_components length");
1731 objArrayOop record_components =
1732 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL);
1733 objArrayHandle components_h (THREAD, record_components);
1734
1735 for (int x = 0; x < length; x++) {
1736 RecordComponent* component = components->at(x);
1737 assert(component != NULL, "unexpected NULL record component");
1738 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1739 components_h->obj_at_put(x, component_oop);
1740 }
1741 return (jobjectArray)JNIHandles::make_local(components_h());
1742 }
1743 }
1744
1745 // Return empty array if ofClass is not a record.
1746 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL);
1747 return (jobjectArray)JNIHandles::make_local(env, result);
1748 }
1749 JVM_END
1750
1751 static bool select_method(const methodHandle& method, bool want_constructor) {
1752 if (want_constructor) {
1753 return (method->is_initializer() && !method->is_static());
1754 } else {
1755 return (!method->is_initializer() && !method->is_overpass());
1756 }
1757 }
1758
1759 static jobjectArray get_class_declared_methods_helper(
1760 JNIEnv *env,
1761 jclass ofClass, jboolean publicOnly,
1762 bool want_constructor,
1763 Klass* klass, TRAPS) {
1764
1765 JvmtiVMObjectAllocEventCollector oam;
1766
1767 // Exclude primitive types and array types
1768 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1769 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1770 // Return empty array
1771 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1772 return (jobjectArray) JNIHandles::make_local(env, res);
1773 }
1774
1775 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1776
1777 // Ensure class is linked
1778 k->link_class(CHECK_NULL);
1779
1780 Array<Method*>* methods = k->methods();
1781 int methods_length = methods->length();
1782
1783 // Save original method_idnum in case of redefinition, which can change
1784 // the idnum of obsolete methods. The new method will have the same idnum
1785 // but if we refresh the methods array, the counts will be wrong.
1786 ResourceMark rm(THREAD);
1787 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1788 int num_methods = 0;
1789
1790 for (int i = 0; i < methods_length; i++) {
1791 methodHandle method(THREAD, methods->at(i));
1792 if (select_method(method, want_constructor)) {
1793 if (!publicOnly || method->is_public()) {
1794 idnums->push(method->method_idnum());
1795 ++num_methods;
1796 }
1797 }
1798 }
1799
1800 // Allocate result
1801 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1802 objArrayHandle result (THREAD, r);
1803
1804 // Now just put the methods that we selected above, but go by their idnum
1805 // in case of redefinition. The methods can be redefined at any safepoint,
1806 // so above when allocating the oop array and below when creating reflect
1807 // objects.
1808 for (int i = 0; i < num_methods; i++) {
1809 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1810 if (method.is_null()) {
1811 // Method may have been deleted and seems this API can handle null
1812 // Otherwise should probably put a method that throws NSME
1813 result->obj_at_put(i, NULL);
1814 } else {
1815 oop m;
1816 if (want_constructor) {
1817 m = Reflection::new_constructor(method, CHECK_NULL);
1818 } else {
1819 m = Reflection::new_method(method, false, CHECK_NULL);
1820 }
1821 result->obj_at_put(i, m);
1822 }
1823 }
1824
1825 return (jobjectArray) JNIHandles::make_local(env, result());
1826 }
1827
1828 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1829 {
1830 JVMWrapper("JVM_GetClassDeclaredMethods");
1831 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1832 /*want_constructor*/ false,
1833 SystemDictionary::reflect_Method_klass(), THREAD);
1834 }
1835 JVM_END
1836
1837 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1838 {
1839 JVMWrapper("JVM_GetClassDeclaredConstructors");
1840 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1841 /*want_constructor*/ true,
1842 SystemDictionary::reflect_Constructor_klass(), THREAD);
1843 }
1844 JVM_END
1845
1846 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1847 {
1848 JVMWrapper("JVM_GetClassAccessFlags");
1849 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1850 // Primitive type
1851 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1852 }
1853
1854 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1855 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1856 }
1857 JVM_END
1858
1859 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1860 {
1861 JVMWrapper("JVM_AreNestMates");
1862 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1863 assert(c->is_instance_klass(), "must be");
1864 InstanceKlass* ck = InstanceKlass::cast(c);
1865 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1866 assert(m->is_instance_klass(), "must be");
1867 InstanceKlass* mk = InstanceKlass::cast(m);
1868 return ck->has_nestmate_access_to(mk, THREAD);
1869 }
1870 JVM_END
1871
1872 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1873 {
1874 // current is not a primitive or array class
1875 JVMWrapper("JVM_GetNestHost");
1876 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1877 assert(c->is_instance_klass(), "must be");
1878 InstanceKlass* ck = InstanceKlass::cast(c);
1879 // Don't post exceptions if validation fails
1880 InstanceKlass* host = ck->nest_host(NULL, THREAD);
1881 return (jclass) (host == NULL ? NULL :
1882 JNIHandles::make_local(THREAD, host->java_mirror()));
1883 }
1884 JVM_END
1885
1886 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1887 {
1888 // current is not a primitive or array class
1889 JVMWrapper("JVM_GetNestMembers");
1890 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1891 assert(c->is_instance_klass(), "must be");
1892 InstanceKlass* ck = InstanceKlass::cast(c);
1893 // Get the nest host for this nest - throw ICCE if validation fails
1894 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
1895 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
1896
1897 {
1898 JvmtiVMObjectAllocEventCollector oam;
1899 Array<u2>* members = host->nest_members();
1900 int length = members == NULL ? 0 : members->length();
1901 // nest host is first in the array so make it one bigger
1902 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
1903 length + 1, CHECK_NULL);
1904 objArrayHandle result (THREAD, r);
1905 result->obj_at_put(0, host->java_mirror());
1906 if (length != 0) {
1907 int i;
1908 for (i = 0; i < length; i++) {
1909 int cp_index = members->at(i);
1910 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
1911 if (k->is_instance_klass()) {
1912 InstanceKlass* nest_host_k =
1913 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
1914 if (nest_host_k == host) {
1915 result->obj_at_put(i+1, k->java_mirror());
1916 }
1917 else {
1918 // k's nest host is legal but it isn't our host so
1919 // throw ICCE
1920 ResourceMark rm(THREAD);
1921 Exceptions::fthrow(THREAD_AND_LOCATION,
1922 icce,
1923 "Nest member %s in %s declares a different nest host of %s",
1924 k->external_name(),
1925 host->external_name(),
1926 nest_host_k->external_name()
1927 );
1928 return NULL;
1929 }
1930 }
1931 else {
1932 // we have a bad nest member entry - throw ICCE
1933 ResourceMark rm(THREAD);
1934 Exceptions::fthrow(THREAD_AND_LOCATION,
1935 icce,
1936 "Class %s can not be a nest member of %s",
1937 k->external_name(),
1938 host->external_name()
1939 );
1940 return NULL;
1941 }
1942 }
1943 }
1944 else {
1945 assert(host == ck, "must be singleton nest");
1946 }
1947 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1948 }
1949 }
1950 JVM_END
1951
1952 // Constant pool access //////////////////////////////////////////////////////////
1953
1954 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1955 {
1956 JVMWrapper("JVM_GetClassConstantPool");
1957 JvmtiVMObjectAllocEventCollector oam;
1958
1959 // Return null for primitives and arrays
1960 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1961 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1962 if (k->is_instance_klass()) {
1963 InstanceKlass* k_h = InstanceKlass::cast(k);
1964 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1965 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1966 return JNIHandles::make_local(jcp());
1967 }
1968 }
1969 return NULL;
1970 }
1971 JVM_END
1972
1973
1974 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1975 {
1976 JVMWrapper("JVM_ConstantPoolGetSize");
1977 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1978 return cp->length();
1979 }
1980 JVM_END
1981
1982
1983 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1984 {
1985 JVMWrapper("JVM_ConstantPoolGetClassAt");
1986 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1987 bounds_check(cp, index, CHECK_NULL);
1988 constantTag tag = cp->tag_at(index);
1989 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1990 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1991 }
1992 Klass* k = cp->klass_at(index, CHECK_NULL);
1993 return (jclass) JNIHandles::make_local(k->java_mirror());
1994 }
1995 JVM_END
1996
1997 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1998 {
1999 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2000 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2001 bounds_check(cp, index, CHECK_NULL);
2002 constantTag tag = cp->tag_at(index);
2003 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2004 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2005 }
2006 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2007 if (k == NULL) return NULL;
2008 return (jclass) JNIHandles::make_local(k->java_mirror());
2009 }
2010 JVM_END
2011
2012 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2013 constantTag tag = cp->tag_at(index);
2014 if (!tag.is_method() && !tag.is_interface_method()) {
2015 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2016 }
2017 int klass_ref = cp->uncached_klass_ref_index_at(index);
2018 Klass* k_o;
2019 if (force_resolution) {
2020 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2021 } else {
2022 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2023 if (k_o == NULL) return NULL;
2024 }
2025 InstanceKlass* k = InstanceKlass::cast(k_o);
2026 Symbol* name = cp->uncached_name_ref_at(index);
2027 Symbol* sig = cp->uncached_signature_ref_at(index);
2028 methodHandle m (THREAD, k->find_method(name, sig));
2029 if (m.is_null()) {
2030 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2031 }
2032 oop method;
2033 if (!m->is_initializer() || m->is_static()) {
2034 method = Reflection::new_method(m, true, CHECK_NULL);
2035 } else {
2036 method = Reflection::new_constructor(m, CHECK_NULL);
2037 }
2038 return JNIHandles::make_local(method);
2039 }
2040
2041 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2042 {
2043 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2044 JvmtiVMObjectAllocEventCollector oam;
2045 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2046 bounds_check(cp, index, CHECK_NULL);
2047 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2048 return res;
2049 }
2050 JVM_END
2051
2052 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2053 {
2054 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2055 JvmtiVMObjectAllocEventCollector oam;
2056 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2057 bounds_check(cp, index, CHECK_NULL);
2058 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2059 return res;
2060 }
2061 JVM_END
2062
2063 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2064 constantTag tag = cp->tag_at(index);
2065 if (!tag.is_field()) {
2066 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2067 }
2068 int klass_ref = cp->uncached_klass_ref_index_at(index);
2069 Klass* k_o;
2070 if (force_resolution) {
2071 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2072 } else {
2073 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2074 if (k_o == NULL) return NULL;
2075 }
2076 InstanceKlass* k = InstanceKlass::cast(k_o);
2077 Symbol* name = cp->uncached_name_ref_at(index);
2078 Symbol* sig = cp->uncached_signature_ref_at(index);
2079 fieldDescriptor fd;
2080 Klass* target_klass = k->find_field(name, sig, &fd);
2081 if (target_klass == NULL) {
2082 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2083 }
2084 oop field = Reflection::new_field(&fd, CHECK_NULL);
2085 return JNIHandles::make_local(field);
2086 }
2087
2088 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2089 {
2090 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2091 JvmtiVMObjectAllocEventCollector oam;
2092 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2093 bounds_check(cp, index, CHECK_NULL);
2094 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2095 return res;
2096 }
2097 JVM_END
2098
2099 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2100 {
2101 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2102 JvmtiVMObjectAllocEventCollector oam;
2103 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2104 bounds_check(cp, index, CHECK_NULL);
2105 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2106 return res;
2107 }
2108 JVM_END
2109
2110 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2111 {
2112 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2113 JvmtiVMObjectAllocEventCollector oam;
2114 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2115 bounds_check(cp, index, CHECK_NULL);
2116 constantTag tag = cp->tag_at(index);
2117 if (!tag.is_field_or_method()) {
2118 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2119 }
2120 int klass_ref = cp->uncached_klass_ref_index_at(index);
2121 Symbol* klass_name = cp->klass_name_at(klass_ref);
2122 Symbol* member_name = cp->uncached_name_ref_at(index);
2123 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2124 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2125 objArrayHandle dest(THREAD, dest_o);
2126 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2127 dest->obj_at_put(0, str());
2128 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2129 dest->obj_at_put(1, str());
2130 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2131 dest->obj_at_put(2, str());
2132 return (jobjectArray) JNIHandles::make_local(dest());
2133 }
2134 JVM_END
2135
2136 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2137 {
2138 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2139 JvmtiVMObjectAllocEventCollector oam;
2140 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2141 bounds_check(cp, index, CHECK_0);
2142 constantTag tag = cp->tag_at(index);
2143 if (!tag.is_field_or_method()) {
2144 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2145 }
2146 return (jint) cp->uncached_klass_ref_index_at(index);
2147 }
2148 JVM_END
2149
2150 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2151 {
2152 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2153 JvmtiVMObjectAllocEventCollector oam;
2154 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2155 bounds_check(cp, index, CHECK_0);
2156 constantTag tag = cp->tag_at(index);
2157 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2158 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2159 }
2160 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2161 }
2162 JVM_END
2163
2164 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2165 {
2166 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2167 JvmtiVMObjectAllocEventCollector oam;
2168 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2169 bounds_check(cp, index, CHECK_NULL);
2170 constantTag tag = cp->tag_at(index);
2171 if (!tag.is_name_and_type()) {
2172 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2173 }
2174 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2175 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2176 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2177 objArrayHandle dest(THREAD, dest_o);
2178 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2179 dest->obj_at_put(0, str());
2180 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2181 dest->obj_at_put(1, str());
2182 return (jobjectArray) JNIHandles::make_local(dest());
2183 }
2184 JVM_END
2185
2186 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2187 {
2188 JVMWrapper("JVM_ConstantPoolGetIntAt");
2189 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2190 bounds_check(cp, index, CHECK_0);
2191 constantTag tag = cp->tag_at(index);
2192 if (!tag.is_int()) {
2193 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2194 }
2195 return cp->int_at(index);
2196 }
2197 JVM_END
2198
2199 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2200 {
2201 JVMWrapper("JVM_ConstantPoolGetLongAt");
2202 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2203 bounds_check(cp, index, CHECK_(0L));
2204 constantTag tag = cp->tag_at(index);
2205 if (!tag.is_long()) {
2206 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2207 }
2208 return cp->long_at(index);
2209 }
2210 JVM_END
2211
2212 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2213 {
2214 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2215 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2216 bounds_check(cp, index, CHECK_(0.0f));
2217 constantTag tag = cp->tag_at(index);
2218 if (!tag.is_float()) {
2219 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2220 }
2221 return cp->float_at(index);
2222 }
2223 JVM_END
2224
2225 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2226 {
2227 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2228 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2229 bounds_check(cp, index, CHECK_(0.0));
2230 constantTag tag = cp->tag_at(index);
2231 if (!tag.is_double()) {
2232 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2233 }
2234 return cp->double_at(index);
2235 }
2236 JVM_END
2237
2238 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2239 {
2240 JVMWrapper("JVM_ConstantPoolGetStringAt");
2241 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2242 bounds_check(cp, index, CHECK_NULL);
2243 constantTag tag = cp->tag_at(index);
2244 if (!tag.is_string()) {
2245 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2246 }
2247 oop str = cp->string_at(index, CHECK_NULL);
2248 return (jstring) JNIHandles::make_local(str);
2249 }
2250 JVM_END
2251
2252 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2253 {
2254 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2255 JvmtiVMObjectAllocEventCollector oam;
2256 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2257 bounds_check(cp, index, CHECK_NULL);
2258 constantTag tag = cp->tag_at(index);
2259 if (!tag.is_symbol()) {
2260 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2261 }
2262 Symbol* sym = cp->symbol_at(index);
2263 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2264 return (jstring) JNIHandles::make_local(str());
2265 }
2266 JVM_END
2267
2268 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2269 {
2270 JVMWrapper("JVM_ConstantPoolGetTagAt");
2271 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2272 bounds_check(cp, index, CHECK_0);
2273 constantTag tag = cp->tag_at(index);
2274 jbyte result = tag.value();
2275 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2276 // they are changed to the corresponding tags from the JVM spec, so that java code in
2277 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2278 if (tag.is_klass_or_reference()) {
2279 result = JVM_CONSTANT_Class;
2280 } else if (tag.is_string_index()) {
2281 result = JVM_CONSTANT_String;
2282 } else if (tag.is_method_type_in_error()) {
2283 result = JVM_CONSTANT_MethodType;
2284 } else if (tag.is_method_handle_in_error()) {
2285 result = JVM_CONSTANT_MethodHandle;
2286 } else if (tag.is_dynamic_constant_in_error()) {
2287 result = JVM_CONSTANT_Dynamic;
2288 }
2289 return result;
2290 }
2291 JVM_END
2292
2293 // Assertion support. //////////////////////////////////////////////////////////
2294
2295 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2296 JVMWrapper("JVM_DesiredAssertionStatus");
2297 assert(cls != NULL, "bad class");
2298
2299 oop r = JNIHandles::resolve(cls);
2300 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2301 if (java_lang_Class::is_primitive(r)) return false;
2302
2303 Klass* k = java_lang_Class::as_Klass(r);
2304 assert(k->is_instance_klass(), "must be an instance klass");
2305 if (!k->is_instance_klass()) return false;
2306
2307 ResourceMark rm(THREAD);
2308 const char* name = k->name()->as_C_string();
2309 bool system_class = k->class_loader() == NULL;
2310 return JavaAssertions::enabled(name, system_class);
2311
2312 JVM_END
2313
2314
2315 // Return a new AssertionStatusDirectives object with the fields filled in with
2316 // command-line assertion arguments (i.e., -ea, -da).
2317 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2318 JVMWrapper("JVM_AssertionStatusDirectives");
2319 JvmtiVMObjectAllocEventCollector oam;
2320 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2321 return JNIHandles::make_local(env, asd);
2322 JVM_END
2323
2324 // Verification ////////////////////////////////////////////////////////////////////////////////
2325
2326 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2327
2328 // RedefineClasses support: bug 6214132 caused verification to fail.
2329 // All functions from this section should call the jvmtiThreadSate function:
2330 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2331 // The function returns a Klass* of the _scratch_class if the verifier
2332 // was invoked in the middle of the class redefinition.
2333 // Otherwise it returns its argument value which is the _the_class Klass*.
2334 // Please, refer to the description in the jvmtiThreadSate.hpp.
2335
2336 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2337 JVMWrapper("JVM_GetClassNameUTF");
2338 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2339 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2340 return k->name()->as_utf8();
2341 JVM_END
2342
2343
2344 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2345 JVMWrapper("JVM_GetClassCPTypes");
2346 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2347 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2348 // types will have length zero if this is not an InstanceKlass
2349 // (length is determined by call to JVM_GetClassCPEntriesCount)
2350 if (k->is_instance_klass()) {
2351 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2352 for (int index = cp->length() - 1; index >= 0; index--) {
2353 constantTag tag = cp->tag_at(index);
2354 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2355 }
2356 }
2357 JVM_END
2358
2359
2360 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2361 JVMWrapper("JVM_GetClassCPEntriesCount");
2362 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2363 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2364 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2365 JVM_END
2366
2367
2368 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2369 JVMWrapper("JVM_GetClassFieldsCount");
2370 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2371 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2372 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2373 JVM_END
2374
2375
2376 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2377 JVMWrapper("JVM_GetClassMethodsCount");
2378 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2379 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2380 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2381 JVM_END
2382
2383
2384 // The following methods, used for the verifier, are never called with
2385 // array klasses, so a direct cast to InstanceKlass is safe.
2386 // Typically, these methods are called in a loop with bounds determined
2387 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2388 // zero for arrays.
2389 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2390 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2391 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2392 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2393 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2394 int length = method->checked_exceptions_length();
2395 if (length > 0) {
2396 CheckedExceptionElement* table= method->checked_exceptions_start();
2397 for (int i = 0; i < length; i++) {
2398 exceptions[i] = table[i].class_cp_index;
2399 }
2400 }
2401 JVM_END
2402
2403
2404 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2405 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2406 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2407 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2408 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2409 return method->checked_exceptions_length();
2410 JVM_END
2411
2412
2413 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2414 JVMWrapper("JVM_GetMethodIxByteCode");
2415 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2416 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2417 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2418 memcpy(code, method->code_base(), method->code_size());
2419 JVM_END
2420
2421
2422 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2423 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2424 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2425 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2426 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2427 return method->code_size();
2428 JVM_END
2429
2430
2431 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2432 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2433 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2434 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2435 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2436 ExceptionTable extable(method);
2437 entry->start_pc = extable.start_pc(entry_index);
2438 entry->end_pc = extable.end_pc(entry_index);
2439 entry->handler_pc = extable.handler_pc(entry_index);
2440 entry->catchType = extable.catch_type_index(entry_index);
2441 JVM_END
2442
2443
2444 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2445 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2446 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2447 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2448 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2449 return method->exception_table_length();
2450 JVM_END
2451
2452
2453 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2454 JVMWrapper("JVM_GetMethodIxModifiers");
2455 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2456 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2457 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2458 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2459 JVM_END
2460
2461
2462 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2463 JVMWrapper("JVM_GetFieldIxModifiers");
2464 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2465 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2466 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2467 JVM_END
2468
2469
2470 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2471 JVMWrapper("JVM_GetMethodIxLocalsCount");
2472 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2473 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2474 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2475 return method->max_locals();
2476 JVM_END
2477
2478
2479 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2480 JVMWrapper("JVM_GetMethodIxArgsSize");
2481 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2482 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2483 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2484 return method->size_of_parameters();
2485 JVM_END
2486
2487
2488 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2489 JVMWrapper("JVM_GetMethodIxMaxStack");
2490 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2491 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2492 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2493 return method->verifier_max_stack();
2494 JVM_END
2495
2496
2497 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2498 JVMWrapper("JVM_IsConstructorIx");
2499 ResourceMark rm(THREAD);
2500 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2501 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2502 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2503 return method->name() == vmSymbols::object_initializer_name();
2504 JVM_END
2505
2506
2507 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2508 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2509 ResourceMark rm(THREAD);
2510 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2511 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2512 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2513 return method->is_overpass();
2514 JVM_END
2515
2516 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2517 JVMWrapper("JVM_GetMethodIxIxUTF");
2518 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2519 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2520 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2521 return method->name()->as_utf8();
2522 JVM_END
2523
2524
2525 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2526 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2527 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2528 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2529 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2530 return method->signature()->as_utf8();
2531 JVM_END
2532
2533 /**
2534 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2535 * read entries in the constant pool. Since the old verifier always
2536 * works on a copy of the code, it will not see any rewriting that
2537 * may possibly occur in the middle of verification. So it is important
2538 * that nothing it calls tries to use the cpCache instead of the raw
2539 * constant pool, so we must use cp->uncached_x methods when appropriate.
2540 */
2541 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2542 JVMWrapper("JVM_GetCPFieldNameUTF");
2543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2544 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2545 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2546 switch (cp->tag_at(cp_index).value()) {
2547 case JVM_CONSTANT_Fieldref:
2548 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2549 default:
2550 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2551 }
2552 ShouldNotReachHere();
2553 return NULL;
2554 JVM_END
2555
2556
2557 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2558 JVMWrapper("JVM_GetCPMethodNameUTF");
2559 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2560 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2561 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2562 switch (cp->tag_at(cp_index).value()) {
2563 case JVM_CONSTANT_InterfaceMethodref:
2564 case JVM_CONSTANT_Methodref:
2565 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2566 default:
2567 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2568 }
2569 ShouldNotReachHere();
2570 return NULL;
2571 JVM_END
2572
2573
2574 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2575 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2576 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2577 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2578 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2579 switch (cp->tag_at(cp_index).value()) {
2580 case JVM_CONSTANT_InterfaceMethodref:
2581 case JVM_CONSTANT_Methodref:
2582 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2583 default:
2584 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2585 }
2586 ShouldNotReachHere();
2587 return NULL;
2588 JVM_END
2589
2590
2591 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2592 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2593 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2594 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2595 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2596 switch (cp->tag_at(cp_index).value()) {
2597 case JVM_CONSTANT_Fieldref:
2598 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2599 default:
2600 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2601 }
2602 ShouldNotReachHere();
2603 return NULL;
2604 JVM_END
2605
2606
2607 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2608 JVMWrapper("JVM_GetCPClassNameUTF");
2609 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2610 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2611 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2612 Symbol* classname = cp->klass_name_at(cp_index);
2613 return classname->as_utf8();
2614 JVM_END
2615
2616
2617 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2618 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2619 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2620 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2621 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2622 switch (cp->tag_at(cp_index).value()) {
2623 case JVM_CONSTANT_Fieldref: {
2624 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2625 Symbol* classname = cp->klass_name_at(class_index);
2626 return classname->as_utf8();
2627 }
2628 default:
2629 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2630 }
2631 ShouldNotReachHere();
2632 return NULL;
2633 JVM_END
2634
2635
2636 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2637 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2638 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2639 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2640 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2641 switch (cp->tag_at(cp_index).value()) {
2642 case JVM_CONSTANT_Methodref:
2643 case JVM_CONSTANT_InterfaceMethodref: {
2644 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2645 Symbol* classname = cp->klass_name_at(class_index);
2646 return classname->as_utf8();
2647 }
2648 default:
2649 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2650 }
2651 ShouldNotReachHere();
2652 return NULL;
2653 JVM_END
2654
2655
2656 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2657 JVMWrapper("JVM_GetCPFieldModifiers");
2658 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2659 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2660 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2661 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2662 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2663 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2664 switch (cp->tag_at(cp_index).value()) {
2665 case JVM_CONSTANT_Fieldref: {
2666 Symbol* name = cp->uncached_name_ref_at(cp_index);
2667 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2668 InstanceKlass* ik = InstanceKlass::cast(k_called);
2669 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2670 if (fs.name() == name && fs.signature() == signature) {
2671 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2672 }
2673 }
2674 return -1;
2675 }
2676 default:
2677 fatal("JVM_GetCPFieldModifiers: illegal constant");
2678 }
2679 ShouldNotReachHere();
2680 return 0;
2681 JVM_END
2682
2683
2684 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2685 JVMWrapper("JVM_GetCPMethodModifiers");
2686 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2687 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2688 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2689 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2690 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2691 switch (cp->tag_at(cp_index).value()) {
2692 case JVM_CONSTANT_Methodref:
2693 case JVM_CONSTANT_InterfaceMethodref: {
2694 Symbol* name = cp->uncached_name_ref_at(cp_index);
2695 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2696 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2697 int methods_count = methods->length();
2698 for (int i = 0; i < methods_count; i++) {
2699 Method* method = methods->at(i);
2700 if (method->name() == name && method->signature() == signature) {
2701 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2702 }
2703 }
2704 return -1;
2705 }
2706 default:
2707 fatal("JVM_GetCPMethodModifiers: illegal constant");
2708 }
2709 ShouldNotReachHere();
2710 return 0;
2711 JVM_END
2712
2713
2714 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2715
2716 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2717 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2718 JVM_END
2719
2720
2721 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2722 JVMWrapper("JVM_IsSameClassPackage");
2723 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2724 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2725 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2726 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2727 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2728 JVM_END
2729
2730 // Printing support //////////////////////////////////////////////////
2731 extern "C" {
2732
2733 ATTRIBUTE_PRINTF(3, 0)
2734 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2735 // Reject count values that are negative signed values converted to
2736 // unsigned; see bug 4399518, 4417214
2737 if ((intptr_t)count <= 0) return -1;
2738
2739 int result = os::vsnprintf(str, count, fmt, args);
2740 if (result > 0 && (size_t)result >= count) {
2741 result = -1;
2742 }
2743
2744 return result;
2745 }
2746
2747 ATTRIBUTE_PRINTF(3, 4)
2748 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2749 va_list args;
2750 int len;
2751 va_start(args, fmt);
2752 len = jio_vsnprintf(str, count, fmt, args);
2753 va_end(args);
2754 return len;
2755 }
2756
2757 ATTRIBUTE_PRINTF(2, 3)
2758 int jio_fprintf(FILE* f, const char *fmt, ...) {
2759 int len;
2760 va_list args;
2761 va_start(args, fmt);
2762 len = jio_vfprintf(f, fmt, args);
2763 va_end(args);
2764 return len;
2765 }
2766
2767 ATTRIBUTE_PRINTF(2, 0)
2768 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2769 if (Arguments::vfprintf_hook() != NULL) {
2770 return Arguments::vfprintf_hook()(f, fmt, args);
2771 } else {
2772 return vfprintf(f, fmt, args);
2773 }
2774 }
2775
2776 ATTRIBUTE_PRINTF(1, 2)
2777 JNIEXPORT int jio_printf(const char *fmt, ...) {
2778 int len;
2779 va_list args;
2780 va_start(args, fmt);
2781 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2782 va_end(args);
2783 return len;
2784 }
2785
2786 // HotSpot specific jio method
2787 void jio_print(const char* s, size_t len) {
2788 // Try to make this function as atomic as possible.
2789 if (Arguments::vfprintf_hook() != NULL) {
2790 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2791 } else {
2792 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2793 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2794 }
2795 }
2796
2797 } // Extern C
2798
2799 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2800
2801 // In most of the JVM thread support functions we need to access the
2802 // thread through a ThreadsListHandle to prevent it from exiting and
2803 // being reclaimed while we try to operate on it. The exceptions to this
2804 // rule are when operating on the current thread, or if the monitor of
2805 // the target java.lang.Thread is locked at the Java level - in both
2806 // cases the target cannot exit.
2807
2808 static void thread_entry(JavaThread* thread, TRAPS) {
2809 HandleMark hm(THREAD);
2810 Handle obj(THREAD, thread->threadObj());
2811 JavaValue result(T_VOID);
2812 JavaCalls::call_virtual(&result,
2813 obj,
2814 SystemDictionary::Thread_klass(),
2815 vmSymbols::run_method_name(),
2816 vmSymbols::void_method_signature(),
2817 THREAD);
2818 }
2819
2820
2821 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2822 JVMWrapper("JVM_StartThread");
2823 JavaThread *native_thread = NULL;
2824
2825 // We cannot hold the Threads_lock when we throw an exception,
2826 // due to rank ordering issues. Example: we might need to grab the
2827 // Heap_lock while we construct the exception.
2828 bool throw_illegal_thread_state = false;
2829
2830 // We must release the Threads_lock before we can post a jvmti event
2831 // in Thread::start.
2832 {
2833 // Ensure that the C++ Thread and OSThread structures aren't freed before
2834 // we operate.
2835 MutexLocker mu(Threads_lock);
2836
2837 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2838 // re-starting an already started thread, so we should usually find
2839 // that the JavaThread is null. However for a JNI attached thread
2840 // there is a small window between the Thread object being created
2841 // (with its JavaThread set) and the update to its threadStatus, so we
2842 // have to check for this
2843 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2844 throw_illegal_thread_state = true;
2845 } else {
2846 // We could also check the stillborn flag to see if this thread was already stopped, but
2847 // for historical reasons we let the thread detect that itself when it starts running
2848
2849 jlong size =
2850 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2851 // Allocate the C++ Thread structure and create the native thread. The
2852 // stack size retrieved from java is 64-bit signed, but the constructor takes
2853 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2854 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2855 // - Avoid passing negative values which would result in really large stacks.
2856 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2857 size_t sz = size > 0 ? (size_t) size : 0;
2858 native_thread = new JavaThread(&thread_entry, sz);
2859
2860 // At this point it may be possible that no osthread was created for the
2861 // JavaThread due to lack of memory. Check for this situation and throw
2862 // an exception if necessary. Eventually we may want to change this so
2863 // that we only grab the lock if the thread was created successfully -
2864 // then we can also do this check and throw the exception in the
2865 // JavaThread constructor.
2866 if (native_thread->osthread() != NULL) {
2867 // Note: the current thread is not being used within "prepare".
2868 native_thread->prepare(jthread);
2869 }
2870 }
2871 }
2872
2873 if (throw_illegal_thread_state) {
2874 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2875 }
2876
2877 assert(native_thread != NULL, "Starting null thread?");
2878
2879 if (native_thread->osthread() == NULL) {
2880 // No one should hold a reference to the 'native_thread'.
2881 native_thread->smr_delete();
2882 if (JvmtiExport::should_post_resource_exhausted()) {
2883 JvmtiExport::post_resource_exhausted(
2884 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2885 os::native_thread_creation_failed_msg());
2886 }
2887 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2888 os::native_thread_creation_failed_msg());
2889 }
2890
2891 Thread::start(native_thread);
2892
2893 JVM_END
2894
2895
2896 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2897 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2898 // but is thought to be reliable and simple. In the case, where the receiver is the
2899 // same thread as the sender, no VM_Operation is needed.
2900 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2901 JVMWrapper("JVM_StopThread");
2902
2903 // A nested ThreadsListHandle will grab the Threads_lock so create
2904 // tlh before we resolve throwable.
2905 ThreadsListHandle tlh(thread);
2906 oop java_throwable = JNIHandles::resolve(throwable);
2907 if (java_throwable == NULL) {
2908 THROW(vmSymbols::java_lang_NullPointerException());
2909 }
2910 oop java_thread = NULL;
2911 JavaThread* receiver = NULL;
2912 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2913 Events::log_exception(thread,
2914 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2915 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2916
2917 if (is_alive) {
2918 // jthread refers to a live JavaThread.
2919 if (thread == receiver) {
2920 // Exception is getting thrown at self so no VM_Operation needed.
2921 THROW_OOP(java_throwable);
2922 } else {
2923 // Use a VM_Operation to throw the exception.
2924 Thread::send_async_exception(java_thread, java_throwable);
2925 }
2926 } else {
2927 // Either:
2928 // - target thread has not been started before being stopped, or
2929 // - target thread already terminated
2930 // We could read the threadStatus to determine which case it is
2931 // but that is overkill as it doesn't matter. We must set the
2932 // stillborn flag for the first case, and if the thread has already
2933 // exited setting this flag has no effect.
2934 java_lang_Thread::set_stillborn(java_thread);
2935 }
2936 JVM_END
2937
2938
2939 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2940 JVMWrapper("JVM_IsThreadAlive");
2941
2942 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2943 return java_lang_Thread::is_alive(thread_oop);
2944 JVM_END
2945
2946
2947 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2948 JVMWrapper("JVM_SuspendThread");
2949
2950 ThreadsListHandle tlh(thread);
2951 JavaThread* receiver = NULL;
2952 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2953 if (is_alive) {
2954 // jthread refers to a live JavaThread.
2955 {
2956 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2957 if (receiver->is_external_suspend()) {
2958 // Don't allow nested external suspend requests. We can't return
2959 // an error from this interface so just ignore the problem.
2960 return;
2961 }
2962 if (receiver->is_exiting()) { // thread is in the process of exiting
2963 return;
2964 }
2965 receiver->set_external_suspend();
2966 }
2967
2968 // java_suspend() will catch threads in the process of exiting
2969 // and will ignore them.
2970 receiver->java_suspend();
2971
2972 // It would be nice to have the following assertion in all the
2973 // time, but it is possible for a racing resume request to have
2974 // resumed this thread right after we suspended it. Temporarily
2975 // enable this assertion if you are chasing a different kind of
2976 // bug.
2977 //
2978 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2979 // receiver->is_being_ext_suspended(), "thread is not suspended");
2980 }
2981 JVM_END
2982
2983
2984 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2985 JVMWrapper("JVM_ResumeThread");
2986
2987 ThreadsListHandle tlh(thread);
2988 JavaThread* receiver = NULL;
2989 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2990 if (is_alive) {
2991 // jthread refers to a live JavaThread.
2992
2993 // This is the original comment for this Threads_lock grab:
2994 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2995 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2996 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2997 // looks at it.
2998 //
2999 // The above comment dates back to when we had both internal and
3000 // external suspend APIs that shared a common underlying mechanism.
3001 // External suspend is now entirely cooperative and doesn't share
3002 // anything with internal suspend. That said, there are some
3003 // assumptions in the VM that an external resume grabs the
3004 // Threads_lock. We can't drop the Threads_lock grab here until we
3005 // resolve the assumptions that exist elsewhere.
3006 //
3007 MutexLocker ml(Threads_lock);
3008 receiver->java_resume();
3009 }
3010 JVM_END
3011
3012
3013 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3014 JVMWrapper("JVM_SetThreadPriority");
3015
3016 ThreadsListHandle tlh(thread);
3017 oop java_thread = NULL;
3018 JavaThread* receiver = NULL;
3019 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3020 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3021
3022 if (is_alive) {
3023 // jthread refers to a live JavaThread.
3024 Thread::set_priority(receiver, (ThreadPriority)prio);
3025 }
3026 // Implied else: If the JavaThread hasn't started yet, then the
3027 // priority set in the java.lang.Thread object above will be pushed
3028 // down when it does start.
3029 JVM_END
3030
3031
3032 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3033 JVMWrapper("JVM_Yield");
3034 if (os::dont_yield()) return;
3035 HOTSPOT_THREAD_YIELD();
3036 os::naked_yield();
3037 JVM_END
3038
3039 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3040 assert(event != NULL, "invariant");
3041 assert(event->should_commit(), "invariant");
3042 event->set_time(millis);
3043 event->commit();
3044 }
3045
3046 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3047 JVMWrapper("JVM_Sleep");
3048
3049 if (millis < 0) {
3050 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3051 }
3052
3053 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3054 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3055 }
3056
3057 // Save current thread state and restore it at the end of this block.
3058 // And set new thread state to SLEEPING.
3059 JavaThreadSleepState jtss(thread);
3060
3061 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3062 EventThreadSleep event;
3063
3064 if (millis == 0) {
3065 os::naked_yield();
3066 } else {
3067 ThreadState old_state = thread->osthread()->get_state();
3068 thread->osthread()->set_state(SLEEPING);
3069 if (!thread->sleep(millis)) { // interrupted
3070 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3071 // us while we were sleeping. We do not overwrite those.
3072 if (!HAS_PENDING_EXCEPTION) {
3073 if (event.should_commit()) {
3074 post_thread_sleep_event(&event, millis);
3075 }
3076 HOTSPOT_THREAD_SLEEP_END(1);
3077
3078 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3079 // to properly restore the thread state. That's likely wrong.
3080 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3081 }
3082 }
3083 thread->osthread()->set_state(old_state);
3084 }
3085 if (event.should_commit()) {
3086 post_thread_sleep_event(&event, millis);
3087 }
3088 HOTSPOT_THREAD_SLEEP_END(0);
3089 JVM_END
3090
3091 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3092 JVMWrapper("JVM_CurrentThread");
3093 oop jthread = thread->threadObj();
3094 assert (thread != NULL, "no current thread!");
3095 return JNIHandles::make_local(env, jthread);
3096 JVM_END
3097
3098 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3099 JVMWrapper("JVM_Interrupt");
3100
3101 ThreadsListHandle tlh(thread);
3102 JavaThread* receiver = NULL;
3103 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3104 if (is_alive) {
3105 // jthread refers to a live JavaThread.
3106 receiver->interrupt();
3107 }
3108 JVM_END
3109
3110
3111 // Return true iff the current thread has locked the object passed in
3112
3113 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3114 JVMWrapper("JVM_HoldsLock");
3115 assert(THREAD->is_Java_thread(), "sanity check");
3116 if (obj == NULL) {
3117 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3118 }
3119 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3120 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3121 JVM_END
3122
3123
3124 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3125 JVMWrapper("JVM_DumpAllStacks");
3126 VM_PrintThreads op;
3127 VMThread::execute(&op);
3128 if (JvmtiExport::should_post_data_dump()) {
3129 JvmtiExport::post_data_dump();
3130 }
3131 JVM_END
3132
3133 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3134 JVMWrapper("JVM_SetNativeThreadName");
3135
3136 // We don't use a ThreadsListHandle here because the current thread
3137 // must be alive.
3138 oop java_thread = JNIHandles::resolve_non_null(jthread);
3139 JavaThread* thr = java_lang_Thread::thread(java_thread);
3140 if (thread == thr && !thr->has_attached_via_jni()) {
3141 // Thread naming is only supported for the current thread and
3142 // we don't set the name of an attached thread to avoid stepping
3143 // on other programs.
3144 ResourceMark rm(thread);
3145 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3146 os::set_native_thread_name(thread_name);
3147 }
3148 JVM_END
3149
3150 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3151
3152 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3153 JVMWrapper("JVM_GetClassContext");
3154 ResourceMark rm(THREAD);
3155 JvmtiVMObjectAllocEventCollector oam;
3156 vframeStream vfst(thread);
3157
3158 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3159 // This must only be called from SecurityManager.getClassContext
3160 Method* m = vfst.method();
3161 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3162 m->name() == vmSymbols::getClassContext_name() &&
3163 m->signature() == vmSymbols::void_class_array_signature())) {
3164 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3165 }
3166 }
3167
3168 // Collect method holders
3169 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3170 for (; !vfst.at_end(); vfst.security_next()) {
3171 Method* m = vfst.method();
3172 // Native frames are not returned
3173 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3174 Klass* holder = m->method_holder();
3175 assert(holder->is_klass(), "just checking");
3176 klass_array->append(holder);
3177 }
3178 }
3179
3180 // Create result array of type [Ljava/lang/Class;
3181 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3182 // Fill in mirrors corresponding to method holders
3183 for (int i = 0; i < klass_array->length(); i++) {
3184 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3185 }
3186
3187 return (jobjectArray) JNIHandles::make_local(env, result);
3188 JVM_END
3189
3190
3191 // java.lang.Package ////////////////////////////////////////////////////////////////
3192
3193
3194 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3195 JVMWrapper("JVM_GetSystemPackage");
3196 ResourceMark rm(THREAD);
3197 JvmtiVMObjectAllocEventCollector oam;
3198 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3199 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3200 return (jstring) JNIHandles::make_local(result);
3201 JVM_END
3202
3203
3204 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3205 JVMWrapper("JVM_GetSystemPackages");
3206 JvmtiVMObjectAllocEventCollector oam;
3207 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3208 return (jobjectArray) JNIHandles::make_local(result);
3209 JVM_END
3210
3211
3212 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3213
3214
3215 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3216 JVMWrapper("JVM_GetAndClearReferencePendingList");
3217
3218 MonitorLocker ml(Heap_lock);
3219 oop ref = Universe::reference_pending_list();
3220 if (ref != NULL) {
3221 Universe::set_reference_pending_list(NULL);
3222 }
3223 return JNIHandles::make_local(env, ref);
3224 JVM_END
3225
3226 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3227 JVMWrapper("JVM_HasReferencePendingList");
3228 MonitorLocker ml(Heap_lock);
3229 return Universe::has_reference_pending_list();
3230 JVM_END
3231
3232 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3233 JVMWrapper("JVM_WaitForReferencePendingList");
3234 MonitorLocker ml(Heap_lock);
3235 while (!Universe::has_reference_pending_list()) {
3236 ml.wait();
3237 }
3238 JVM_END
3239
3240
3241 // ObjectInputStream ///////////////////////////////////////////////////////////////
3242
3243 // Return the first user-defined class loader up the execution stack, or null
3244 // if only code from the bootstrap or platform class loader is on the stack.
3245
3246 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3247 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3248 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3249 oop loader = vfst.method()->method_holder()->class_loader();
3250 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3251 return JNIHandles::make_local(env, loader);
3252 }
3253 }
3254 return NULL;
3255 JVM_END
3256
3257
3258 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3259
3260
3261 // resolve array handle and check arguments
3262 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3263 if (arr == NULL) {
3264 THROW_0(vmSymbols::java_lang_NullPointerException());
3265 }
3266 oop a = JNIHandles::resolve_non_null(arr);
3267 if (!a->is_array()) {
3268 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3269 } else if (type_array_only && !a->is_typeArray()) {
3270 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3271 }
3272 return arrayOop(a);
3273 }
3274
3275
3276 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3277 JVMWrapper("JVM_GetArrayLength");
3278 arrayOop a = check_array(env, arr, false, CHECK_0);
3279 return a->length();
3280 JVM_END
3281
3282
3283 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3284 JVMWrapper("JVM_Array_Get");
3285 JvmtiVMObjectAllocEventCollector oam;
3286 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3287 jvalue value;
3288 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3289 oop box = Reflection::box(&value, type, CHECK_NULL);
3290 return JNIHandles::make_local(env, box);
3291 JVM_END
3292
3293
3294 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3295 JVMWrapper("JVM_GetPrimitiveArrayElement");
3296 jvalue value;
3297 value.i = 0; // to initialize value before getting used in CHECK
3298 arrayOop a = check_array(env, arr, true, CHECK_(value));
3299 assert(a->is_typeArray(), "just checking");
3300 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3301 BasicType wide_type = (BasicType) wCode;
3302 if (type != wide_type) {
3303 Reflection::widen(&value, type, wide_type, CHECK_(value));
3304 }
3305 return value;
3306 JVM_END
3307
3308
3309 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3310 JVMWrapper("JVM_SetArrayElement");
3311 arrayOop a = check_array(env, arr, false, CHECK);
3312 oop box = JNIHandles::resolve(val);
3313 jvalue value;
3314 value.i = 0; // to initialize value before getting used in CHECK
3315 BasicType value_type;
3316 if (a->is_objArray()) {
3317 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3318 value_type = Reflection::unbox_for_regular_object(box, &value);
3319 } else {
3320 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3321 }
3322 Reflection::array_set(&value, a, index, value_type, CHECK);
3323 JVM_END
3324
3325
3326 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3327 JVMWrapper("JVM_SetPrimitiveArrayElement");
3328 arrayOop a = check_array(env, arr, true, CHECK);
3329 assert(a->is_typeArray(), "just checking");
3330 BasicType value_type = (BasicType) vCode;
3331 Reflection::array_set(&v, a, index, value_type, CHECK);
3332 JVM_END
3333
3334
3335 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3336 JVMWrapper("JVM_NewArray");
3337 JvmtiVMObjectAllocEventCollector oam;
3338 oop element_mirror = JNIHandles::resolve(eltClass);
3339 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3340 return JNIHandles::make_local(env, result);
3341 JVM_END
3342
3343
3344 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3345 JVMWrapper("JVM_NewMultiArray");
3346 JvmtiVMObjectAllocEventCollector oam;
3347 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3348 oop element_mirror = JNIHandles::resolve(eltClass);
3349 assert(dim_array->is_typeArray(), "just checking");
3350 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3351 return JNIHandles::make_local(env, result);
3352 JVM_END
3353
3354
3355 // Library support ///////////////////////////////////////////////////////////////////////////
3356
3357 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3358 //%note jvm_ct
3359 JVMWrapper("JVM_LoadLibrary");
3360 char ebuf[1024];
3361 void *load_result;
3362 {
3363 ThreadToNativeFromVM ttnfvm(thread);
3364 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3365 }
3366 if (load_result == NULL) {
3367 char msg[1024];
3368 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3369 // Since 'ebuf' may contain a string encoded using
3370 // platform encoding scheme, we need to pass
3371 // Exceptions::unsafe_to_utf8 to the new_exception method
3372 // as the last argument. See bug 6367357.
3373 Handle h_exception =
3374 Exceptions::new_exception(thread,
3375 vmSymbols::java_lang_UnsatisfiedLinkError(),
3376 msg, Exceptions::unsafe_to_utf8);
3377
3378 THROW_HANDLE_0(h_exception);
3379 }
3380 return load_result;
3381 JVM_END
3382
3383
3384 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3385 JVMWrapper("JVM_UnloadLibrary");
3386 os::dll_unload(handle);
3387 JVM_END
3388
3389
3390 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3391 JVMWrapper("JVM_FindLibraryEntry");
3392 return os::dll_lookup(handle, name);
3393 JVM_END
3394
3395
3396 // JNI version ///////////////////////////////////////////////////////////////////////////////
3397
3398 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3399 JVMWrapper("JVM_IsSupportedJNIVersion");
3400 return Threads::is_supported_jni_version_including_1_1(version);
3401 JVM_END
3402
3403
3404 // String support ///////////////////////////////////////////////////////////////////////////
3405
3406 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3407 JVMWrapper("JVM_InternString");
3408 JvmtiVMObjectAllocEventCollector oam;
3409 if (str == NULL) return NULL;
3410 oop string = JNIHandles::resolve_non_null(str);
3411 oop result = StringTable::intern(string, CHECK_NULL);
3412 return (jstring) JNIHandles::make_local(env, result);
3413 JVM_END
3414
3415
3416 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3417
3418 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3419 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3420 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3421 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3422 // nature. JavaThreads will be "in native" when using this API from JDK code.
3423
3424
3425 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3426 VM_Exit::block_if_vm_exited();
3427 JVMWrapper("JVM_RawMonitorCreate");
3428 return new os::PlatformMutex();
3429 }
3430
3431
3432 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3433 VM_Exit::block_if_vm_exited();
3434 JVMWrapper("JVM_RawMonitorDestroy");
3435 delete ((os::PlatformMutex*) mon);
3436 }
3437
3438
3439 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3440 VM_Exit::block_if_vm_exited();
3441 JVMWrapper("JVM_RawMonitorEnter");
3442 ((os::PlatformMutex*) mon)->lock();
3443 return 0;
3444 }
3445
3446
3447 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3448 VM_Exit::block_if_vm_exited();
3449 JVMWrapper("JVM_RawMonitorExit");
3450 ((os::PlatformMutex*) mon)->unlock();
3451 }
3452
3453
3454 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3455
3456 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3457 Handle loader, Handle protection_domain,
3458 jboolean throwError, TRAPS) {
3459 // Security Note:
3460 // The Java level wrapper will perform the necessary security check allowing
3461 // us to pass the NULL as the initiating class loader. The VM is responsible for
3462 // the checkPackageAccess relative to the initiating class loader via the
3463 // protection_domain. The protection_domain is passed as NULL by the java code
3464 // if there is no security manager in 3-arg Class.forName().
3465 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3466
3467 // Check if we should initialize the class
3468 if (init && klass->is_instance_klass()) {
3469 klass->initialize(CHECK_NULL);
3470 }
3471 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3472 }
3473
3474
3475 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3476
3477 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3478 JVMWrapper("JVM_InvokeMethod");
3479 Handle method_handle;
3480 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3481 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3482 Handle receiver(THREAD, JNIHandles::resolve(obj));
3483 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3484 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3485 jobject res = JNIHandles::make_local(env, result);
3486 if (JvmtiExport::should_post_vm_object_alloc()) {
3487 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3488 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3489 if (java_lang_Class::is_primitive(ret_type)) {
3490 // Only for primitive type vm allocates memory for java object.
3491 // See box() method.
3492 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3493 }
3494 }
3495 return res;
3496 } else {
3497 THROW_0(vmSymbols::java_lang_StackOverflowError());
3498 }
3499 JVM_END
3500
3501
3502 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3503 JVMWrapper("JVM_NewInstanceFromConstructor");
3504 oop constructor_mirror = JNIHandles::resolve(c);
3505 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3506 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3507 jobject res = JNIHandles::make_local(env, result);
3508 if (JvmtiExport::should_post_vm_object_alloc()) {
3509 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3510 }
3511 return res;
3512 JVM_END
3513
3514 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3515
3516 JVM_LEAF(jboolean, JVM_SupportsCX8())
3517 JVMWrapper("JVM_SupportsCX8");
3518 return VM_Version::supports_cx8();
3519 JVM_END
3520
3521 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3522 JVMWrapper("JVM_InitializeFromArchive");
3523 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3524 assert(k->is_klass(), "just checking");
3525 HeapShared::initialize_from_archived_subgraph(k);
3526 JVM_END
3527
3528 // Returns an array of all live Thread objects (VM internal JavaThreads,
3529 // jvmti agent threads, and JNI attaching threads are skipped)
3530 // See CR 6404306 regarding JNI attaching threads
3531 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3532 ResourceMark rm(THREAD);
3533 ThreadsListEnumerator tle(THREAD, false, false);
3534 JvmtiVMObjectAllocEventCollector oam;
3535
3536 int num_threads = tle.num_threads();
3537 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3538 objArrayHandle threads_ah(THREAD, r);
3539
3540 for (int i = 0; i < num_threads; i++) {
3541 Handle h = tle.get_threadObj(i);
3542 threads_ah->obj_at_put(i, h());
3543 }
3544
3545 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3546 JVM_END
3547
3548
3549 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3550 // Return StackTraceElement[][], each element is the stack trace of a thread in
3551 // the corresponding entry in the given threads array
3552 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3553 JVMWrapper("JVM_DumpThreads");
3554 JvmtiVMObjectAllocEventCollector oam;
3555
3556 // Check if threads is null
3557 if (threads == NULL) {
3558 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3559 }
3560
3561 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3562 objArrayHandle ah(THREAD, a);
3563 int num_threads = ah->length();
3564 // check if threads is non-empty array
3565 if (num_threads == 0) {
3566 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3567 }
3568
3569 // check if threads is not an array of objects of Thread class
3570 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3571 if (k != SystemDictionary::Thread_klass()) {
3572 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3573 }
3574
3575 ResourceMark rm(THREAD);
3576
3577 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3578 for (int i = 0; i < num_threads; i++) {
3579 oop thread_obj = ah->obj_at(i);
3580 instanceHandle h(THREAD, (instanceOop) thread_obj);
3581 thread_handle_array->append(h);
3582 }
3583
3584 // The JavaThread references in thread_handle_array are validated
3585 // in VM_ThreadDump::doit().
3586 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3587 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3588
3589 JVM_END
3590
3591 // JVM monitoring and management support
3592 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3593 return Management::get_jmm_interface(version);
3594 JVM_END
3595
3596 // com.sun.tools.attach.VirtualMachine agent properties support
3597 //
3598 // Initialize the agent properties with the properties maintained in the VM
3599 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3600 JVMWrapper("JVM_InitAgentProperties");
3601 ResourceMark rm;
3602
3603 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3604
3605 PUTPROP(props, "sun.java.command", Arguments::java_command());
3606 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3607 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3608 return properties;
3609 JVM_END
3610
3611 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3612 {
3613 JVMWrapper("JVM_GetEnclosingMethodInfo");
3614 JvmtiVMObjectAllocEventCollector oam;
3615
3616 if (ofClass == NULL) {
3617 return NULL;
3618 }
3619 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3620 // Special handling for primitive objects
3621 if (java_lang_Class::is_primitive(mirror())) {
3622 return NULL;
3623 }
3624 Klass* k = java_lang_Class::as_Klass(mirror());
3625 if (!k->is_instance_klass()) {
3626 return NULL;
3627 }
3628 InstanceKlass* ik = InstanceKlass::cast(k);
3629 int encl_method_class_idx = ik->enclosing_method_class_index();
3630 if (encl_method_class_idx == 0) {
3631 return NULL;
3632 }
3633 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3634 objArrayHandle dest(THREAD, dest_o);
3635 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3636 dest->obj_at_put(0, enc_k->java_mirror());
3637 int encl_method_method_idx = ik->enclosing_method_method_index();
3638 if (encl_method_method_idx != 0) {
3639 Symbol* sym = ik->constants()->symbol_at(
3640 extract_low_short_from_int(
3641 ik->constants()->name_and_type_at(encl_method_method_idx)));
3642 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3643 dest->obj_at_put(1, str());
3644 sym = ik->constants()->symbol_at(
3645 extract_high_short_from_int(
3646 ik->constants()->name_and_type_at(encl_method_method_idx)));
3647 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3648 dest->obj_at_put(2, str());
3649 }
3650 return (jobjectArray) JNIHandles::make_local(dest());
3651 }
3652 JVM_END
3653
3654 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3655 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3656 ResourceMark rm(THREAD);
3657
3658 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3659 return NULL;
3660 }
3661
3662 char** vm_flags = Arguments::jvm_flags_array();
3663 char** vm_args = Arguments::jvm_args_array();
3664 int num_flags = Arguments::num_jvm_flags();
3665 int num_args = Arguments::num_jvm_args();
3666
3667 InstanceKlass* ik = SystemDictionary::String_klass();
3668 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3669 objArrayHandle result_h(THREAD, r);
3670
3671 int index = 0;
3672 for (int j = 0; j < num_flags; j++, index++) {
3673 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3674 result_h->obj_at_put(index, h());
3675 }
3676 for (int i = 0; i < num_args; i++, index++) {
3677 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3678 result_h->obj_at_put(index, h());
3679 }
3680 return (jobjectArray) JNIHandles::make_local(env, result_h());
3681 JVM_END
3682
3683 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3684 return os::get_signal_number(name);
3685 JVM_END