1 /*
2 * Copyright (c) 1997, 2018, 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/systemDictionary.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "gc/shared/collectedHeap.inline.hpp"
39 #include "interpreter/bytecode.hpp"
40 #include "jfr/jfrEvents.hpp"
41 #include "logging/log.hpp"
42 #include "memory/heapShared.hpp"
43 #include "memory/oopFactory.hpp"
44 #include "memory/referenceType.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "memory/universe.hpp"
47 #include "oops/access.inline.hpp"
48 #include "oops/fieldStreams.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/method.hpp"
51 #include "oops/objArrayKlass.hpp"
52 #include "oops/objArrayOop.inline.hpp"
53 #include "oops/oop.inline.hpp"
54 #include "prims/jvm_misc.hpp"
55 #include "prims/jvmtiExport.hpp"
56 #include "prims/jvmtiThreadState.hpp"
57 #include "prims/nativeLookup.hpp"
58 #include "prims/privilegedStack.hpp"
59 #include "prims/stackwalk.hpp"
60 #include "runtime/arguments.hpp"
61 #include "runtime/atomic.hpp"
62 #include "runtime/handles.inline.hpp"
63 #include "runtime/init.hpp"
64 #include "runtime/interfaceSupport.inline.hpp"
65 #include "runtime/java.hpp"
66 #include "runtime/javaCalls.hpp"
67 #include "runtime/jfieldIDWorkaround.hpp"
68 #include "runtime/jniHandles.inline.hpp"
69 #include "runtime/orderAccess.hpp"
70 #include "runtime/os.inline.hpp"
71 #include "runtime/perfData.hpp"
72 #include "runtime/reflection.hpp"
73 #include "runtime/thread.inline.hpp"
74 #include "runtime/threadSMR.hpp"
75 #include "runtime/vframe.inline.hpp"
76 #include "runtime/vm_operations.hpp"
77 #include "runtime/vm_version.hpp"
78 #include "services/attachListener.hpp"
79 #include "services/management.hpp"
80 #include "services/threadService.hpp"
81 #include "utilities/copy.hpp"
82 #include "utilities/defaultStream.hpp"
83 #include "utilities/dtrace.hpp"
84 #include "utilities/events.hpp"
85 #include "utilities/histogram.hpp"
86 #include "utilities/macros.hpp"
87 #include "utilities/utf8.hpp"
88 #if INCLUDE_CDS
89 #include "classfile/systemDictionaryShared.hpp"
90 #endif
91
92 #include <errno.h>
93
94 /*
95 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
96 such ctors and calls MUST NOT come between an oop declaration/init and its
97 usage because if objects are move this may cause various memory stomps, bus
98 errors and segfaults. Here is a cookbook for causing so called "naked oop
99 failures":
100
101 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
102 JVMWrapper("JVM_GetClassDeclaredFields");
103
104 // Object address to be held directly in mirror & not visible to GC
105 oop mirror = JNIHandles::resolve_non_null(ofClass);
106
107 // If this ctor can hit a safepoint, moving objects around, then
108 ComplexConstructor foo;
109
110 // Boom! mirror may point to JUNK instead of the intended object
111 (some dereference of mirror)
112
113 // Here's another call that may block for GC, making mirror stale
114 MutexLocker ml(some_lock);
115
116 // And here's an initializer that can result in a stale oop
117 // all in one step.
118 oop o = call_that_can_throw_exception(TRAPS);
119
120
121 The solution is to keep the oop declaration BELOW the ctor or function
122 call that might cause a GC, do another resolve to reassign the oop, or
123 consider use of a Handle instead of an oop so there is immunity from object
124 motion. But note that the "QUICK" entries below do not have a handlemark
125 and thus can only support use of handles passed in.
126 */
127
128 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
129 ResourceMark rm;
130 int line_number = -1;
131 const char * source_file = NULL;
132 const char * trace = "explicit";
133 InstanceKlass* caller = NULL;
134 JavaThread* jthread = JavaThread::current();
135 if (jthread->has_last_Java_frame()) {
136 vframeStream vfst(jthread);
137
138 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
139 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
140 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
141 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
142 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
143
144 Method* last_caller = NULL;
145
146 while (!vfst.at_end()) {
147 Method* m = vfst.method();
148 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
149 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
150 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
151 break;
152 }
153 last_caller = m;
154 vfst.next();
155 }
156 // if this is called from Class.forName0 and that is called from Class.forName,
157 // then print the caller of Class.forName. If this is Class.loadClass, then print
158 // that caller, otherwise keep quiet since this should be picked up elsewhere.
159 bool found_it = false;
160 if (!vfst.at_end() &&
161 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
162 vfst.method()->name() == vmSymbols::forName0_name()) {
163 vfst.next();
164 if (!vfst.at_end() &&
165 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
166 vfst.method()->name() == vmSymbols::forName_name()) {
167 vfst.next();
168 found_it = true;
169 }
170 } else if (last_caller != NULL &&
171 last_caller->method_holder()->name() ==
172 vmSymbols::java_lang_ClassLoader() &&
173 last_caller->name() == vmSymbols::loadClass_name()) {
174 found_it = true;
175 } else if (!vfst.at_end()) {
176 if (vfst.method()->is_native()) {
177 // JNI call
178 found_it = true;
179 }
180 }
181 if (found_it && !vfst.at_end()) {
182 // found the caller
183 caller = vfst.method()->method_holder();
184 line_number = vfst.method()->line_number_from_bci(vfst.bci());
185 if (line_number == -1) {
186 // show method name if it's a native method
187 trace = vfst.method()->name_and_sig_as_C_string();
188 }
189 Symbol* s = caller->source_file_name();
190 if (s != NULL) {
191 source_file = s->as_C_string();
192 }
193 }
194 }
195 if (caller != NULL) {
196 if (to_class != caller) {
197 const char * from = caller->external_name();
198 const char * to = to_class->external_name();
199 // print in a single call to reduce interleaving between threads
200 if (source_file != NULL) {
201 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
202 } else {
203 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
204 }
205 }
206 }
207 }
208
209 void trace_class_resolution(Klass* to_class) {
210 EXCEPTION_MARK;
211 trace_class_resolution_impl(to_class, THREAD);
212 if (HAS_PENDING_EXCEPTION) {
213 CLEAR_PENDING_EXCEPTION;
214 }
215 }
216
217 // Wrapper to trace JVM functions
218
219 #ifdef ASSERT
220 Histogram* JVMHistogram;
221 volatile int JVMHistogram_lock = 0;
222
223 class JVMHistogramElement : public HistogramElement {
224 public:
225 JVMHistogramElement(const char* name);
226 };
227
228 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
229 _name = elementName;
230 uintx count = 0;
231
232 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
233 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
234 count +=1;
235 if ( (WarnOnStalledSpinLock > 0)
236 && (count % WarnOnStalledSpinLock == 0)) {
237 warning("JVMHistogram_lock seems to be stalled");
238 }
239 }
240 }
241
242 if(JVMHistogram == NULL)
243 JVMHistogram = new Histogram("JVM Call Counts",100);
244
245 JVMHistogram->add_element(this);
246 Atomic::dec(&JVMHistogram_lock);
247 }
248
249 #define JVMCountWrapper(arg) \
250 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
251 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
252
253 #define JVMWrapper(arg) JVMCountWrapper(arg);
254 #else
255 #define JVMWrapper(arg)
256 #endif
257
258
259 // Interface version /////////////////////////////////////////////////////////////////////
260
261
262 JVM_LEAF(jint, JVM_GetInterfaceVersion())
263 return JVM_INTERFACE_VERSION;
264 JVM_END
265
266
267 // java.lang.System //////////////////////////////////////////////////////////////////////
268
269
270 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
271 JVMWrapper("JVM_CurrentTimeMillis");
272 return os::javaTimeMillis();
273 JVM_END
274
275 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
276 JVMWrapper("JVM_NanoTime");
277 return os::javaTimeNanos();
278 JVM_END
279
280 // The function below is actually exposed by jdk.internal.misc.VM and not
281 // java.lang.System, but we choose to keep it here so that it stays next
282 // to JVM_CurrentTimeMillis and JVM_NanoTime
283
284 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
285 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
286
287 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
288 JVMWrapper("JVM_GetNanoTimeAdjustment");
289 jlong seconds;
290 jlong nanos;
291
292 os::javaTimeSystemUTC(seconds, nanos);
293
294 // We're going to verify that the result can fit in a long.
295 // For that we need the difference in seconds between 'seconds'
296 // and 'offset_secs' to be such that:
297 // |seconds - offset_secs| < (2^63/10^9)
298 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
299 // which makes |seconds - offset_secs| < 2^33
300 // and we will prefer +/- 2^32 as the maximum acceptable diff
301 // as 2^32 has a more natural feel than 2^33...
302 //
303 // So if |seconds - offset_secs| >= 2^32 - we return a special
304 // sentinel value (-1) which the caller should take as an
305 // exception value indicating that the offset given to us is
306 // too far from range of the current time - leading to too big
307 // a nano adjustment. The caller is expected to recover by
308 // computing a more accurate offset and calling this method
309 // again. (For the record 2^32 secs is ~136 years, so that
310 // should rarely happen)
311 //
312 jlong diff = seconds - offset_secs;
313 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
314 return -1; // sentinel value: the offset is too far off the target
315 }
316
317 // return the adjustment. If you compute a time by adding
318 // this number of nanoseconds along with the number of seconds
319 // in the offset you should get the current UTC time.
320 return (diff * (jlong)1000000000) + nanos;
321 JVM_END
322
323 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
324 jobject dst, jint dst_pos, jint length))
325 JVMWrapper("JVM_ArrayCopy");
326 // Check if we have null pointers
327 if (src == NULL || dst == NULL) {
328 THROW(vmSymbols::java_lang_NullPointerException());
329 }
330 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
331 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
332 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
333 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
334 // Do copy
335 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
336 JVM_END
337
338
339 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
340 JavaValue r(T_OBJECT);
341 // public synchronized Object put(Object key, Object value);
342 HandleMark hm(THREAD);
343 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
344 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
345 JavaCalls::call_virtual(&r,
346 props,
347 SystemDictionary::Properties_klass(),
348 vmSymbols::put_name(),
349 vmSymbols::object_object_object_signature(),
350 key_str,
351 value_str,
352 THREAD);
353 }
354
355
356 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
357
358
359 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
360 JVMWrapper("JVM_InitProperties");
361 ResourceMark rm;
362
363 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
364
365 // System property list includes both user set via -D option and
366 // jvm system specific properties.
367 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
368 PUTPROP(props, p->key(), p->value());
369 }
370
371 // Convert the -XX:MaxDirectMemorySize= command line flag
372 // to the sun.nio.MaxDirectMemorySize property.
373 // Do this after setting user properties to prevent people
374 // from setting the value with a -D option, as requested.
375 {
376 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
377 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
378 } else {
379 char as_chars[256];
380 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
381 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
382 }
383 }
384
385 // JVM monitoring and management support
386 // Add the sun.management.compiler property for the compiler's name
387 {
388 #undef CSIZE
389 #if defined(_LP64) || defined(_WIN64)
390 #define CSIZE "64-Bit "
391 #else
392 #define CSIZE
393 #endif // 64bit
394
395 #ifdef TIERED
396 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
397 #else
398 #if defined(COMPILER1)
399 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
400 #elif defined(COMPILER2)
401 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
402 #elif INCLUDE_JVMCI
403 #error "INCLUDE_JVMCI should imply TIERED"
404 #else
405 const char* compiler_name = "";
406 #endif // compilers
407 #endif // TIERED
408
409 if (*compiler_name != '\0' &&
410 (Arguments::mode() != Arguments::_int)) {
411 PUTPROP(props, "sun.management.compiler", compiler_name);
412 }
413 }
414
415 return properties;
416 JVM_END
417
418
419 /*
420 * Return the temporary directory that the VM uses for the attach
421 * and perf data files.
422 *
423 * It is important that this directory is well-known and the
424 * same for all VM instances. It cannot be affected by configuration
425 * variables such as java.io.tmpdir.
426 */
427 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
428 JVMWrapper("JVM_GetTemporaryDirectory");
429 HandleMark hm(THREAD);
430 const char* temp_dir = os::get_temp_directory();
431 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
432 return (jstring) JNIHandles::make_local(env, h());
433 JVM_END
434
435
436 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
437
438 extern volatile jint vm_created;
439
440 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
441 JVMWrapper("JVM_BeforeHalt");
442 EventShutdown event;
443 if (event.should_commit()) {
444 event.set_reason("Shutdown requested from Java");
445 event.commit();
446 }
447 JVM_END
448
449
450 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
451 before_exit(thread);
452 vm_exit(code);
453 JVM_END
454
455
456 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
457 JVMWrapper("JVM_GC");
458 if (!DisableExplicitGC) {
459 Universe::heap()->collect(GCCause::_java_lang_system_gc);
460 }
461 JVM_END
462
463
464 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
465 JVMWrapper("JVM_MaxObjectInspectionAge");
466 return Universe::heap()->millis_since_last_gc();
467 JVM_END
468
469
470 static inline jlong convert_size_t_to_jlong(size_t val) {
471 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
472 NOT_LP64 (return (jlong)val;)
473 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
474 }
475
476 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
477 JVMWrapper("JVM_TotalMemory");
478 size_t n = Universe::heap()->capacity();
479 return convert_size_t_to_jlong(n);
480 JVM_END
481
482
483 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
484 JVMWrapper("JVM_FreeMemory");
485 CollectedHeap* ch = Universe::heap();
486 size_t n;
487 {
488 MutexLocker x(Heap_lock);
489 n = ch->capacity() - ch->used();
490 }
491 return convert_size_t_to_jlong(n);
492 JVM_END
493
494
495 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
496 JVMWrapper("JVM_MaxMemory");
497 size_t n = Universe::heap()->max_capacity();
498 return convert_size_t_to_jlong(n);
499 JVM_END
500
501
502 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
503 JVMWrapper("JVM_ActiveProcessorCount");
504 return os::active_processor_count();
505 JVM_END
506
507
508
509 // java.lang.Throwable //////////////////////////////////////////////////////
510
511
512 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
513 JVMWrapper("JVM_FillInStackTrace");
514 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
515 java_lang_Throwable::fill_in_stack_trace(exception);
516 JVM_END
517
518
519 // java.lang.StackTraceElement //////////////////////////////////////////////
520
521
522 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
523 JVMWrapper("JVM_InitStackTraceElementArray");
524 Handle exception(THREAD, JNIHandles::resolve(throwable));
525 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
526 objArrayHandle stack_trace(THREAD, st);
527 // Fill in the allocated stack trace
528 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
529 JVM_END
530
531
532 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
533 JVMWrapper("JVM_InitStackTraceElement");
534 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
535 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
536 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
537 JVM_END
538
539
540 // java.lang.StackWalker //////////////////////////////////////////////////////
541
542
543 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
544 jint skip_frames, jint frame_count, jint start_index,
545 jobjectArray frames))
546 JVMWrapper("JVM_CallStackWalk");
547 JavaThread* jt = (JavaThread*) THREAD;
548 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
549 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
550 }
551
552 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
553
554 // frames array is a Class<?>[] array when only getting caller reference,
555 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
556 // be null.
557 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
558 objArrayHandle frames_array_h(THREAD, fa);
559
560 int limit = start_index + frame_count;
561 if (frames_array_h->length() < limit) {
562 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
563 }
564
565 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
566 start_index, frames_array_h, CHECK_NULL);
567 return JNIHandles::make_local(env, result);
568 JVM_END
569
570
571 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
572 jint frame_count, jint start_index,
573 jobjectArray frames))
574 JVMWrapper("JVM_MoreStackWalk");
575 JavaThread* jt = (JavaThread*) THREAD;
576
577 // frames array is a Class<?>[] array when only getting caller reference,
578 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
579 // be null.
580 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
581 objArrayHandle frames_array_h(THREAD, fa);
582
583 int limit = start_index+frame_count;
584 if (frames_array_h->length() < limit) {
585 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
586 }
587
588 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
589 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
590 start_index, frames_array_h, THREAD);
591 JVM_END
592
593 // java.lang.Object ///////////////////////////////////////////////
594
595
596 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
597 JVMWrapper("JVM_IHashCode");
598 // as implemented in the classic virtual machine; return 0 if object is NULL
599 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
600 JVM_END
601
602
603 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
604 JVMWrapper("JVM_MonitorWait");
605 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
606 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
607 if (JvmtiExport::should_post_monitor_wait()) {
608 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
609
610 // The current thread already owns the monitor and it has not yet
611 // been added to the wait queue so the current thread cannot be
612 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
613 // event handler cannot accidentally consume an unpark() meant for
614 // the ParkEvent associated with this ObjectMonitor.
615 }
616 ObjectSynchronizer::wait(obj, ms, CHECK);
617 JVM_END
618
619
620 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
621 JVMWrapper("JVM_MonitorNotify");
622 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
623 ObjectSynchronizer::notify(obj, CHECK);
624 JVM_END
625
626
627 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
628 JVMWrapper("JVM_MonitorNotifyAll");
629 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
630 ObjectSynchronizer::notifyall(obj, CHECK);
631 JVM_END
632
633
634 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
635 JVMWrapper("JVM_Clone");
636 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
637 Klass* klass = obj->klass();
638 JvmtiVMObjectAllocEventCollector oam;
639
640 #ifdef ASSERT
641 // Just checking that the cloneable flag is set correct
642 if (obj->is_array()) {
643 guarantee(klass->is_cloneable(), "all arrays are cloneable");
644 } else {
645 guarantee(obj->is_instance(), "should be instanceOop");
646 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
647 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
648 }
649 #endif
650
651 // Check if class of obj supports the Cloneable interface.
652 // All arrays are considered to be cloneable (See JLS 20.1.5).
653 // All j.l.r.Reference classes are considered non-cloneable.
654 if (!klass->is_cloneable() ||
655 (klass->is_instance_klass() &&
656 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
657 ResourceMark rm(THREAD);
658 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
659 }
660
661 // Make shallow object copy
662 const int size = obj->size();
663 oop new_obj_oop = NULL;
664 if (obj->is_array()) {
665 const int length = ((arrayOop)obj())->length();
666 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
667 /* do_zero */ true, CHECK_NULL);
668 } else {
669 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
670 }
671
672 HeapAccess<>::clone(obj(), new_obj_oop, size);
673
674 Handle new_obj(THREAD, new_obj_oop);
675 // Caution: this involves a java upcall, so the clone should be
676 // "gc-robust" by this stage.
677 if (klass->has_finalizer()) {
678 assert(obj->is_instance(), "should be instanceOop");
679 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
680 new_obj = Handle(THREAD, new_obj_oop);
681 }
682
683 return JNIHandles::make_local(env, new_obj());
684 JVM_END
685
686 // java.io.File ///////////////////////////////////////////////////////////////
687
688 JVM_LEAF(char*, JVM_NativePath(char* path))
689 JVMWrapper("JVM_NativePath");
690 return os::native_path(path);
691 JVM_END
692
693
694 // Misc. class handling ///////////////////////////////////////////////////////////
695
696
697 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
698 JVMWrapper("JVM_GetCallerClass");
699
700 // Getting the class of the caller frame.
701 //
702 // The call stack at this point looks something like this:
703 //
704 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
705 // [1] [ @CallerSensitive API.method ]
706 // [.] [ (skipped intermediate frames) ]
707 // [n] [ caller ]
708 vframeStream vfst(thread);
709 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
710 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
711 Method* m = vfst.method();
712 assert(m != NULL, "sanity");
713 switch (n) {
714 case 0:
715 // This must only be called from Reflection.getCallerClass
716 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
717 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
718 }
719 // fall-through
720 case 1:
721 // Frame 0 and 1 must be caller sensitive.
722 if (!m->caller_sensitive()) {
723 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
724 }
725 break;
726 default:
727 if (!m->is_ignored_by_security_stack_walk()) {
728 // We have reached the desired frame; return the holder class.
729 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
730 }
731 break;
732 }
733 }
734 return NULL;
735 JVM_END
736
737
738 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
739 JVMWrapper("JVM_FindPrimitiveClass");
740 oop mirror = NULL;
741 BasicType t = name2type(utf);
742 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
743 mirror = Universe::java_mirror(t);
744 }
745 if (mirror == NULL) {
746 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
747 } else {
748 return (jclass) JNIHandles::make_local(env, mirror);
749 }
750 JVM_END
751
752
753 // Returns a class loaded by the bootstrap class loader; or null
754 // if not found. ClassNotFoundException is not thrown.
755 // FindClassFromBootLoader is exported to the launcher for windows.
756 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
757 const char* name))
758 JVMWrapper("JVM_FindClassFromBootLoader");
759
760 // Java libraries should ensure that name is never null...
761 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
762 // It's impossible to create this class; the name cannot fit
763 // into the constant pool.
764 return NULL;
765 }
766
767 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
768 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
769 if (k == NULL) {
770 return NULL;
771 }
772
773 if (log_is_enabled(Debug, class, resolve)) {
774 trace_class_resolution(k);
775 }
776 return (jclass) JNIHandles::make_local(env, k->java_mirror());
777 JVM_END
778
779 // Find a class with this name in this loader, using the caller's protection domain.
780 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
781 jboolean init, jobject loader,
782 jclass caller))
783 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
784 // Java libraries should ensure that name is never null...
785 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
786 // It's impossible to create this class; the name cannot fit
787 // into the constant pool.
788 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
789 }
790
791 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
792
793 oop loader_oop = JNIHandles::resolve(loader);
794 oop from_class = JNIHandles::resolve(caller);
795 oop protection_domain = NULL;
796 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
797 // NPE. Put it in another way, the bootstrap class loader has all permission and
798 // thus no checkPackageAccess equivalence in the VM class loader.
799 // The caller is also passed as NULL by the java code if there is no security
800 // manager to avoid the performance cost of getting the calling class.
801 if (from_class != NULL && loader_oop != NULL) {
802 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
803 }
804
805 Handle h_loader(THREAD, loader_oop);
806 Handle h_prot(THREAD, protection_domain);
807 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
808 h_prot, false, THREAD);
809
810 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
811 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
812 }
813 return result;
814 JVM_END
815
816 // Currently only called from the old verifier.
817 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
818 jboolean init, jclass from))
819 JVMWrapper("JVM_FindClassFromClass");
820 if (name == NULL) {
821 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
822 }
823 if ((int)strlen(name) > Symbol::max_length()) {
824 // It's impossible to create this class; the name cannot fit
825 // into the constant pool.
826 Exceptions::fthrow(THREAD_AND_LOCATION,
827 vmSymbols::java_lang_NoClassDefFoundError(),
828 "Class name exceeds maximum length of %d: %s",
829 Symbol::max_length(),
830 name);
831 return 0;
832 }
833 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
834 oop from_class_oop = JNIHandles::resolve(from);
835 Klass* from_class = (from_class_oop == NULL)
836 ? (Klass*)NULL
837 : java_lang_Class::as_Klass(from_class_oop);
838 oop class_loader = NULL;
839 oop protection_domain = NULL;
840 if (from_class != NULL) {
841 class_loader = from_class->class_loader();
842 protection_domain = from_class->protection_domain();
843 }
844 Handle h_loader(THREAD, class_loader);
845 Handle h_prot (THREAD, protection_domain);
846 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
847 h_prot, true, thread);
848 if (result != NULL) {
849 oop mirror = JNIHandles::resolve_non_null(result);
850 Klass* to_class = java_lang_Class::as_Klass(mirror);
851 ClassLoaderData::class_loader_data(h_loader())->record_dependency(to_class);
852 }
853
854 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
855 // this function is generally only used for class loading during verification.
856 ResourceMark rm;
857 oop from_mirror = JNIHandles::resolve_non_null(from);
858 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
859 const char * from_name = from_class->external_name();
860
861 oop mirror = JNIHandles::resolve_non_null(result);
862 Klass* to_class = java_lang_Class::as_Klass(mirror);
863 const char * to = to_class->external_name();
864 log_debug(class, resolve)("%s %s (verification)", from_name, to);
865 }
866
867 return result;
868 JVM_END
869
870 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
871 if (loader.is_null()) {
872 return;
873 }
874
875 // check whether the current caller thread holds the lock or not.
876 // If not, increment the corresponding counter
877 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
878 ObjectSynchronizer::owner_self) {
879 counter->inc();
880 }
881 }
882
883 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
884 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
885 jobject loader, const jbyte *buf,
886 jsize len, jobject pd, const char *source,
887 TRAPS) {
888 if (source == NULL) source = "__JVM_DefineClass__";
889
890 assert(THREAD->is_Java_thread(), "must be a JavaThread");
891 JavaThread* jt = (JavaThread*) THREAD;
892
893 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
894 ClassLoader::perf_define_appclass_selftime(),
895 ClassLoader::perf_define_appclasses(),
896 jt->get_thread_stat()->perf_recursion_counts_addr(),
897 jt->get_thread_stat()->perf_timers_addr(),
898 PerfClassTraceTime::DEFINE_CLASS);
899
900 if (UsePerfData) {
901 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
902 }
903
904 // Since exceptions can be thrown, class initialization can take place
905 // if name is NULL no check for class name in .class stream has to be made.
906 TempNewSymbol class_name = NULL;
907 if (name != NULL) {
908 const int str_len = (int)strlen(name);
909 if (str_len > Symbol::max_length()) {
910 // It's impossible to create this class; the name cannot fit
911 // into the constant pool.
912 Exceptions::fthrow(THREAD_AND_LOCATION,
913 vmSymbols::java_lang_NoClassDefFoundError(),
914 "Class name exceeds maximum length of %d: %s",
915 Symbol::max_length(),
916 name);
917 return 0;
918 }
919 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
920 }
921
922 ResourceMark rm(THREAD);
923 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
924 Handle class_loader (THREAD, JNIHandles::resolve(loader));
925 if (UsePerfData) {
926 is_lock_held_by_thread(class_loader,
927 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
928 THREAD);
929 }
930 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
931 Klass* k = SystemDictionary::resolve_from_stream(class_name,
932 class_loader,
933 protection_domain,
934 &st,
935 CHECK_NULL);
936
937 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
938 trace_class_resolution(k);
939 }
940
941 return (jclass) JNIHandles::make_local(env, k->java_mirror());
942 }
943
944
945 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
946 JVMWrapper("JVM_DefineClass");
947
948 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
949 JVM_END
950
951
952 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
953 JVMWrapper("JVM_DefineClassWithSource");
954
955 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
956 JVM_END
957
958 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
959 JVMWrapper("JVM_FindLoadedClass");
960 ResourceMark rm(THREAD);
961
962 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
963 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
964
965 const char* str = java_lang_String::as_utf8_string(string());
966 // Sanity check, don't expect null
967 if (str == NULL) return NULL;
968
969 const int str_len = (int)strlen(str);
970 if (str_len > Symbol::max_length()) {
971 // It's impossible to create this class; the name cannot fit
972 // into the constant pool.
973 return NULL;
974 }
975 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
976
977 // Security Note:
978 // The Java level wrapper will perform the necessary security check allowing
979 // us to pass the NULL as the initiating class loader.
980 Handle h_loader(THREAD, JNIHandles::resolve(loader));
981 if (UsePerfData) {
982 is_lock_held_by_thread(h_loader,
983 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
984 THREAD);
985 }
986
987 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
988 h_loader,
989 Handle(),
990 CHECK_NULL);
991 #if INCLUDE_CDS
992 if (k == NULL) {
993 // If the class is not already loaded, try to see if it's in the shared
994 // archive for the current classloader (h_loader).
995 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
996 }
997 #endif
998 return (k == NULL) ? NULL :
999 (jclass) JNIHandles::make_local(env, k->java_mirror());
1000 JVM_END
1001
1002 // Module support //////////////////////////////////////////////////////////////////////////////
1003
1004 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1005 jstring location, const char* const* packages, jsize num_packages))
1006 JVMWrapper("JVM_DefineModule");
1007 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1008 JVM_END
1009
1010 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1011 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1012 Modules::set_bootloader_unnamed_module(module, CHECK);
1013 JVM_END
1014
1015 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1016 JVMWrapper("JVM_AddModuleExports");
1017 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1018 JVM_END
1019
1020 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1021 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1022 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1023 JVM_END
1024
1025 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1026 JVMWrapper("JVM_AddModuleExportsToAll");
1027 Modules::add_module_exports(from_module, package, NULL, CHECK);
1028 JVM_END
1029
1030 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1031 JVMWrapper("JVM_AddReadsModule");
1032 Modules::add_reads_module(from_module, source_module, CHECK);
1033 JVM_END
1034
1035 // Reflection support //////////////////////////////////////////////////////////////////////////////
1036
1037 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1038 assert (cls != NULL, "illegal class");
1039 JVMWrapper("JVM_GetClassName");
1040 JvmtiVMObjectAllocEventCollector oam;
1041 ResourceMark rm(THREAD);
1042 const char* name;
1043 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1044 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1045 } else {
1046 // Consider caching interned string in Klass
1047 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1048 assert(k->is_klass(), "just checking");
1049 name = k->external_name();
1050 }
1051 oop result = StringTable::intern((char*) name, CHECK_NULL);
1052 return (jstring) JNIHandles::make_local(env, result);
1053 JVM_END
1054
1055
1056 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1057 JVMWrapper("JVM_GetClassInterfaces");
1058 JvmtiVMObjectAllocEventCollector oam;
1059 oop mirror = JNIHandles::resolve_non_null(cls);
1060
1061 // Special handling for primitive objects
1062 if (java_lang_Class::is_primitive(mirror)) {
1063 // Primitive objects does not have any interfaces
1064 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1065 return (jobjectArray) JNIHandles::make_local(env, r);
1066 }
1067
1068 Klass* klass = java_lang_Class::as_Klass(mirror);
1069 // Figure size of result array
1070 int size;
1071 if (klass->is_instance_klass()) {
1072 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1073 } else {
1074 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1075 size = 2;
1076 }
1077
1078 // Allocate result array
1079 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1080 objArrayHandle result (THREAD, r);
1081 // Fill in result
1082 if (klass->is_instance_klass()) {
1083 // Regular instance klass, fill in all local interfaces
1084 for (int index = 0; index < size; index++) {
1085 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1086 result->obj_at_put(index, k->java_mirror());
1087 }
1088 } else {
1089 // All arrays implement java.lang.Cloneable and java.io.Serializable
1090 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1091 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1092 }
1093 return (jobjectArray) JNIHandles::make_local(env, result());
1094 JVM_END
1095
1096
1097 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1098 JVMWrapper("JVM_IsInterface");
1099 oop mirror = JNIHandles::resolve_non_null(cls);
1100 if (java_lang_Class::is_primitive(mirror)) {
1101 return JNI_FALSE;
1102 }
1103 Klass* k = java_lang_Class::as_Klass(mirror);
1104 jboolean result = k->is_interface();
1105 assert(!result || k->is_instance_klass(),
1106 "all interfaces are instance types");
1107 // The compiler intrinsic for isInterface tests the
1108 // Klass::_access_flags bits in the same way.
1109 return result;
1110 JVM_END
1111
1112
1113 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1114 JVMWrapper("JVM_GetClassSigners");
1115 JvmtiVMObjectAllocEventCollector oam;
1116 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1117 // There are no signers for primitive types
1118 return NULL;
1119 }
1120
1121 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1122
1123 // If there are no signers set in the class, or if the class
1124 // is an array, return NULL.
1125 if (signers == NULL) return NULL;
1126
1127 // copy of the signers array
1128 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1129 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1130 for (int index = 0; index < signers->length(); index++) {
1131 signers_copy->obj_at_put(index, signers->obj_at(index));
1132 }
1133
1134 // return the copy
1135 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1136 JVM_END
1137
1138
1139 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1140 JVMWrapper("JVM_SetClassSigners");
1141 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1142 // This call is ignored for primitive types and arrays.
1143 // Signers are only set once, ClassLoader.java, and thus shouldn't
1144 // be called with an array. Only the bootstrap loader creates arrays.
1145 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1146 if (k->is_instance_klass()) {
1147 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1148 }
1149 }
1150 JVM_END
1151
1152
1153 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1154 JVMWrapper("JVM_GetProtectionDomain");
1155 if (JNIHandles::resolve(cls) == NULL) {
1156 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1157 }
1158
1159 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1160 // Primitive types does not have a protection domain.
1161 return NULL;
1162 }
1163
1164 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1165 return (jobject) JNIHandles::make_local(env, pd);
1166 JVM_END
1167
1168
1169 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) {
1170 // If there is a security manager and protection domain, check the access
1171 // in the protection domain, otherwise it is authorized.
1172 if (java_lang_System::has_security_manager()) {
1173
1174 // For bootstrapping, if pd implies method isn't in the JDK, allow
1175 // this context to revert to older behavior.
1176 // In this case the isAuthorized field in AccessControlContext is also not
1177 // present.
1178 if (Universe::protection_domain_implies_method() == NULL) {
1179 return true;
1180 }
1181
1182 // Whitelist certain access control contexts
1183 if (java_security_AccessControlContext::is_authorized(context)) {
1184 return true;
1185 }
1186
1187 oop prot = klass->protection_domain();
1188 if (prot != NULL) {
1189 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1190 // in the new wrapper.
1191 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1192 Handle h_prot(THREAD, prot);
1193 JavaValue result(T_BOOLEAN);
1194 JavaCallArguments args(h_prot);
1195 JavaCalls::call(&result, m, &args, CHECK_false);
1196 return (result.get_jboolean() != 0);
1197 }
1198 }
1199 return true;
1200 }
1201
1202 // Create an AccessControlContext with a protection domain with null codesource
1203 // and null permissions - which gives no permissions.
1204 oop create_dummy_access_control_context(TRAPS) {
1205 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1206 // Call constructor ProtectionDomain(null, null);
1207 Handle obj = JavaCalls::construct_new_instance(pd_klass,
1208 vmSymbols::codesource_permissioncollection_signature(),
1209 Handle(), Handle(), CHECK_NULL);
1210
1211 // new ProtectionDomain[] {pd};
1212 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1213 context->obj_at_put(0, obj());
1214
1215 // new AccessControlContext(new ProtectionDomain[] {pd})
1216 objArrayHandle h_context(THREAD, context);
1217 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1218 return acc;
1219 }
1220
1221 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1222 JVMWrapper("JVM_DoPrivileged");
1223
1224 if (action == NULL) {
1225 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1226 }
1227
1228 // Compute the frame initiating the do privileged operation and setup the privileged stack
1229 vframeStream vfst(thread);
1230 vfst.security_get_caller_frame(1);
1231
1232 if (vfst.at_end()) {
1233 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1234 }
1235
1236 Method* method = vfst.method();
1237 InstanceKlass* klass = method->method_holder();
1238
1239 // Check that action object understands "Object run()"
1240 Handle h_context;
1241 if (context != NULL) {
1242 h_context = Handle(THREAD, JNIHandles::resolve(context));
1243 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1244 if (!authorized) {
1245 // Create an unprivileged access control object and call it's run function
1246 // instead.
1247 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1248 h_context = Handle(THREAD, noprivs);
1249 }
1250 }
1251
1252 // Check that action object understands "Object run()"
1253 Handle object (THREAD, JNIHandles::resolve(action));
1254
1255 // get run() method
1256 Method* m_oop = object->klass()->uncached_lookup_method(
1257 vmSymbols::run_method_name(),
1258 vmSymbols::void_object_signature(),
1259 Klass::find_overpass);
1260
1261 // See if there is a default method for "Object run()".
1262 if (m_oop == NULL && object->klass()->is_instance_klass()) {
1263 InstanceKlass* iklass = InstanceKlass::cast(object->klass());
1264 m_oop = iklass->lookup_method_in_ordered_interfaces(
1265 vmSymbols::run_method_name(),
1266 vmSymbols::void_object_signature());
1267 }
1268
1269 methodHandle m (THREAD, m_oop);
1270 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) {
1271 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1272 }
1273
1274 // Stack allocated list of privileged stack elements
1275 PrivilegedElement pi;
1276 if (!vfst.at_end()) {
1277 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1278 thread->set_privileged_stack_top(&pi);
1279 }
1280
1281
1282 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1283 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1284 Handle pending_exception;
1285 JavaValue result(T_OBJECT);
1286 JavaCallArguments args(object);
1287 JavaCalls::call(&result, m, &args, THREAD);
1288
1289 // done with action, remove ourselves from the list
1290 if (!vfst.at_end()) {
1291 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1292 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1293 }
1294
1295 if (HAS_PENDING_EXCEPTION) {
1296 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1297 CLEAR_PENDING_EXCEPTION;
1298 // JVMTI has already reported the pending exception
1299 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1300 if (THREAD->is_Java_thread()) {
1301 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1302 }
1303 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1304 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1305 // Throw a java.security.PrivilegedActionException(Exception e) exception
1306 JavaCallArguments args(pending_exception);
1307 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1308 vmSymbols::exception_void_signature(),
1309 &args);
1310 }
1311 }
1312
1313 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1314 return JNIHandles::make_local(env, (oop) result.get_jobject());
1315 JVM_END
1316
1317
1318 // Returns the inherited_access_control_context field of the running thread.
1319 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1320 JVMWrapper("JVM_GetInheritedAccessControlContext");
1321 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1322 return JNIHandles::make_local(env, result);
1323 JVM_END
1324
1325 class RegisterArrayForGC {
1326 private:
1327 JavaThread *_thread;
1328 public:
1329 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1330 _thread = thread;
1331 _thread->register_array_for_gc(array);
1332 }
1333
1334 ~RegisterArrayForGC() {
1335 _thread->register_array_for_gc(NULL);
1336 }
1337 };
1338
1339
1340 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1341 JVMWrapper("JVM_GetStackAccessControlContext");
1342 if (!UsePrivilegedStack) return NULL;
1343
1344 ResourceMark rm(THREAD);
1345 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1346 JvmtiVMObjectAllocEventCollector oam;
1347
1348 // count the protection domains on the execution stack. We collapse
1349 // duplicate consecutive protection domains into a single one, as
1350 // well as stopping when we hit a privileged frame.
1351
1352 // Use vframeStream to iterate through Java frames
1353 vframeStream vfst(thread);
1354
1355 oop previous_protection_domain = NULL;
1356 Handle privileged_context(thread, NULL);
1357 bool is_privileged = false;
1358 oop protection_domain = NULL;
1359
1360 for(; !vfst.at_end(); vfst.next()) {
1361 // get method of frame
1362 Method* method = vfst.method();
1363 intptr_t* frame_id = vfst.frame_id();
1364
1365 // check the privileged frames to see if we have a match
1366 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1367 // this frame is privileged
1368 is_privileged = true;
1369 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1370 protection_domain = thread->privileged_stack_top()->protection_domain();
1371 } else {
1372 protection_domain = method->method_holder()->protection_domain();
1373 }
1374
1375 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) {
1376 local_array->push(protection_domain);
1377 previous_protection_domain = protection_domain;
1378 }
1379
1380 if (is_privileged) break;
1381 }
1382
1383
1384 // either all the domains on the stack were system domains, or
1385 // we had a privileged system domain
1386 if (local_array->is_empty()) {
1387 if (is_privileged && privileged_context.is_null()) return NULL;
1388
1389 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1390 return JNIHandles::make_local(env, result);
1391 }
1392
1393 // the resource area must be registered in case of a gc
1394 RegisterArrayForGC ragc(thread, local_array);
1395 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1396 local_array->length(), CHECK_NULL);
1397 objArrayHandle h_context(thread, context);
1398 for (int index = 0; index < local_array->length(); index++) {
1399 h_context->obj_at_put(index, local_array->at(index));
1400 }
1401
1402 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1403
1404 return JNIHandles::make_local(env, result);
1405 JVM_END
1406
1407
1408 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1409 JVMWrapper("JVM_IsArrayClass");
1410 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1411 return (k != NULL) && k->is_array_klass() ? true : false;
1412 JVM_END
1413
1414
1415 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1416 JVMWrapper("JVM_IsPrimitiveClass");
1417 oop mirror = JNIHandles::resolve_non_null(cls);
1418 return (jboolean) java_lang_Class::is_primitive(mirror);
1419 JVM_END
1420
1421
1422 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1423 JVMWrapper("JVM_GetClassModifiers");
1424 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1425 // Primitive type
1426 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1427 }
1428
1429 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1430 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1431 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1432 return k->modifier_flags();
1433 JVM_END
1434
1435
1436 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1437
1438 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1439 JvmtiVMObjectAllocEventCollector oam;
1440 // ofClass is a reference to a java_lang_Class object. The mirror object
1441 // of an InstanceKlass
1442
1443 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1444 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1445 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1446 return (jobjectArray)JNIHandles::make_local(env, result);
1447 }
1448
1449 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1450 InnerClassesIterator iter(k);
1451
1452 if (iter.length() == 0) {
1453 // Neither an inner nor outer class
1454 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1455 return (jobjectArray)JNIHandles::make_local(env, result);
1456 }
1457
1458 // find inner class info
1459 constantPoolHandle cp(thread, k->constants());
1460 int length = iter.length();
1461
1462 // Allocate temp. result array
1463 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1464 objArrayHandle result (THREAD, r);
1465 int members = 0;
1466
1467 for (; !iter.done(); iter.next()) {
1468 int ioff = iter.inner_class_info_index();
1469 int ooff = iter.outer_class_info_index();
1470
1471 if (ioff != 0 && ooff != 0) {
1472 // Check to see if the name matches the class we're looking for
1473 // before attempting to find the class.
1474 if (cp->klass_name_at_matches(k, ooff)) {
1475 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1476 if (outer_klass == k) {
1477 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1478 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1479
1480 // Throws an exception if outer klass has not declared k as
1481 // an inner klass
1482 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1483
1484 result->obj_at_put(members, inner_klass->java_mirror());
1485 members++;
1486 }
1487 }
1488 }
1489 }
1490
1491 if (members != length) {
1492 // Return array of right length
1493 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1494 for(int i = 0; i < members; i++) {
1495 res->obj_at_put(i, result->obj_at(i));
1496 }
1497 return (jobjectArray)JNIHandles::make_local(env, res);
1498 }
1499
1500 return (jobjectArray)JNIHandles::make_local(env, result());
1501 JVM_END
1502
1503
1504 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1505 {
1506 // ofClass is a reference to a java_lang_Class object.
1507 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1508 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1509 return NULL;
1510 }
1511
1512 bool inner_is_member = false;
1513 Klass* outer_klass
1514 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1515 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1516 if (outer_klass == NULL) return NULL; // already a top-level class
1517 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1518 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1519 }
1520 JVM_END
1521
1522 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1523 {
1524 oop mirror = JNIHandles::resolve_non_null(cls);
1525 if (java_lang_Class::is_primitive(mirror) ||
1526 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1527 return NULL;
1528 }
1529 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1530 int ooff = 0, noff = 0;
1531 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1532 if (noff != 0) {
1533 constantPoolHandle i_cp(thread, k->constants());
1534 Symbol* name = i_cp->symbol_at(noff);
1535 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1536 return (jstring) JNIHandles::make_local(env, str());
1537 }
1538 }
1539 return NULL;
1540 }
1541 JVM_END
1542
1543 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1544 assert (cls != NULL, "illegal class");
1545 JVMWrapper("JVM_GetClassSignature");
1546 JvmtiVMObjectAllocEventCollector oam;
1547 ResourceMark rm(THREAD);
1548 // Return null for arrays and primatives
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 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1553 if (sym == NULL) return NULL;
1554 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1555 return (jstring) JNIHandles::make_local(env, str());
1556 }
1557 }
1558 return NULL;
1559 JVM_END
1560
1561
1562 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1563 assert (cls != NULL, "illegal class");
1564 JVMWrapper("JVM_GetClassAnnotations");
1565
1566 // Return null for arrays and primitives
1567 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1568 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1569 if (k->is_instance_klass()) {
1570 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1571 return (jbyteArray) JNIHandles::make_local(env, a);
1572 }
1573 }
1574 return NULL;
1575 JVM_END
1576
1577
1578 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1579 // some of this code was adapted from from jni_FromReflectedField
1580
1581 oop reflected = JNIHandles::resolve_non_null(field);
1582 oop mirror = java_lang_reflect_Field::clazz(reflected);
1583 Klass* k = java_lang_Class::as_Klass(mirror);
1584 int slot = java_lang_reflect_Field::slot(reflected);
1585 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1586
1587 InstanceKlass* ik = InstanceKlass::cast(k);
1588 intptr_t offset = ik->field_offset(slot);
1589
1590 if (modifiers & JVM_ACC_STATIC) {
1591 // for static fields we only look in the current class
1592 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1593 assert(false, "cannot find static field");
1594 return false;
1595 }
1596 } else {
1597 // for instance fields we start with the current class and work
1598 // our way up through the superclass chain
1599 if (!ik->find_field_from_offset(offset, false, &fd)) {
1600 assert(false, "cannot find instance field");
1601 return false;
1602 }
1603 }
1604 return true;
1605 }
1606
1607 static Method* jvm_get_method_common(jobject method) {
1608 // some of this code was adapted from from jni_FromReflectedMethod
1609
1610 oop reflected = JNIHandles::resolve_non_null(method);
1611 oop mirror = NULL;
1612 int slot = 0;
1613
1614 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1615 mirror = java_lang_reflect_Constructor::clazz(reflected);
1616 slot = java_lang_reflect_Constructor::slot(reflected);
1617 } else {
1618 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1619 "wrong type");
1620 mirror = java_lang_reflect_Method::clazz(reflected);
1621 slot = java_lang_reflect_Method::slot(reflected);
1622 }
1623 Klass* k = java_lang_Class::as_Klass(mirror);
1624
1625 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1626 assert(m != NULL, "cannot find method");
1627 return m; // caller has to deal with NULL in product mode
1628 }
1629
1630 /* Type use annotations support (JDK 1.8) */
1631
1632 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1633 assert (cls != NULL, "illegal class");
1634 JVMWrapper("JVM_GetClassTypeAnnotations");
1635 ResourceMark rm(THREAD);
1636 // Return null for arrays and primitives
1637 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1638 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1639 if (k->is_instance_klass()) {
1640 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1641 if (type_annotations != NULL) {
1642 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1643 return (jbyteArray) JNIHandles::make_local(env, a);
1644 }
1645 }
1646 }
1647 return NULL;
1648 JVM_END
1649
1650 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1651 assert (method != NULL, "illegal method");
1652 JVMWrapper("JVM_GetMethodTypeAnnotations");
1653
1654 // method is a handle to a java.lang.reflect.Method object
1655 Method* m = jvm_get_method_common(method);
1656 if (m == NULL) {
1657 return NULL;
1658 }
1659
1660 AnnotationArray* type_annotations = m->type_annotations();
1661 if (type_annotations != NULL) {
1662 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1663 return (jbyteArray) JNIHandles::make_local(env, a);
1664 }
1665
1666 return NULL;
1667 JVM_END
1668
1669 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1670 assert (field != NULL, "illegal field");
1671 JVMWrapper("JVM_GetFieldTypeAnnotations");
1672
1673 fieldDescriptor fd;
1674 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1675 if (!gotFd) {
1676 return NULL;
1677 }
1678
1679 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1680 JVM_END
1681
1682 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1683 if (!cp->is_within_bounds(index)) {
1684 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1685 }
1686 }
1687
1688 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1689 {
1690 JVMWrapper("JVM_GetMethodParameters");
1691 // method is a handle to a java.lang.reflect.Method object
1692 Method* method_ptr = jvm_get_method_common(method);
1693 methodHandle mh (THREAD, method_ptr);
1694 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1695 const int num_params = mh->method_parameters_length();
1696
1697 if (num_params < 0) {
1698 // A -1 return value from method_parameters_length means there is no
1699 // parameter data. Return null to indicate this to the reflection
1700 // API.
1701 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1702 return (jobjectArray)NULL;
1703 } else {
1704 // Otherwise, we return something up to reflection, even if it is
1705 // a zero-length array. Why? Because in some cases this can
1706 // trigger a MalformedParametersException.
1707
1708 // make sure all the symbols are properly formatted
1709 for (int i = 0; i < num_params; i++) {
1710 MethodParametersElement* params = mh->method_parameters_start();
1711 int index = params[i].name_cp_index;
1712 bounds_check(mh->constants(), index, CHECK_NULL);
1713
1714 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1715 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1716 "Wrong type at constant pool index");
1717 }
1718
1719 }
1720
1721 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1722 objArrayHandle result (THREAD, result_oop);
1723
1724 for (int i = 0; i < num_params; i++) {
1725 MethodParametersElement* params = mh->method_parameters_start();
1726 // For a 0 index, give a NULL symbol
1727 Symbol* sym = 0 != params[i].name_cp_index ?
1728 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1729 int flags = params[i].flags;
1730 oop param = Reflection::new_parameter(reflected_method, i, sym,
1731 flags, CHECK_NULL);
1732 result->obj_at_put(i, param);
1733 }
1734 return (jobjectArray)JNIHandles::make_local(env, result());
1735 }
1736 }
1737 JVM_END
1738
1739 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1740
1741 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1742 {
1743 JVMWrapper("JVM_GetClassDeclaredFields");
1744 JvmtiVMObjectAllocEventCollector oam;
1745
1746 // Exclude primitive types and array types
1747 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1748 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1749 // Return empty array
1750 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1751 return (jobjectArray) JNIHandles::make_local(env, res);
1752 }
1753
1754 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1755 constantPoolHandle cp(THREAD, k->constants());
1756
1757 // Ensure class is linked
1758 k->link_class(CHECK_NULL);
1759
1760 // Allocate result
1761 int num_fields;
1762
1763 if (publicOnly) {
1764 num_fields = 0;
1765 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1766 if (fs.access_flags().is_public()) ++num_fields;
1767 }
1768 } else {
1769 num_fields = k->java_fields_count();
1770 }
1771
1772 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1773 objArrayHandle result (THREAD, r);
1774
1775 int out_idx = 0;
1776 fieldDescriptor fd;
1777 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1778 if (!publicOnly || fs.access_flags().is_public()) {
1779 fd.reinitialize(k, fs.index());
1780 oop field = Reflection::new_field(&fd, CHECK_NULL);
1781 result->obj_at_put(out_idx, field);
1782 ++out_idx;
1783 }
1784 }
1785 assert(out_idx == num_fields, "just checking");
1786 return (jobjectArray) JNIHandles::make_local(env, result());
1787 }
1788 JVM_END
1789
1790 static bool select_method(const methodHandle& method, bool want_constructor) {
1791 if (want_constructor) {
1792 return (method->is_initializer() && !method->is_static());
1793 } else {
1794 return (!method->is_initializer() && !method->is_overpass());
1795 }
1796 }
1797
1798 static jobjectArray get_class_declared_methods_helper(
1799 JNIEnv *env,
1800 jclass ofClass, jboolean publicOnly,
1801 bool want_constructor,
1802 Klass* klass, TRAPS) {
1803
1804 JvmtiVMObjectAllocEventCollector oam;
1805
1806 // Exclude primitive types and array types
1807 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1808 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1809 // Return empty array
1810 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1811 return (jobjectArray) JNIHandles::make_local(env, res);
1812 }
1813
1814 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1815
1816 // Ensure class is linked
1817 k->link_class(CHECK_NULL);
1818
1819 Array<Method*>* methods = k->methods();
1820 int methods_length = methods->length();
1821
1822 // Save original method_idnum in case of redefinition, which can change
1823 // the idnum of obsolete methods. The new method will have the same idnum
1824 // but if we refresh the methods array, the counts will be wrong.
1825 ResourceMark rm(THREAD);
1826 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1827 int num_methods = 0;
1828
1829 for (int i = 0; i < methods_length; i++) {
1830 methodHandle method(THREAD, methods->at(i));
1831 if (select_method(method, want_constructor)) {
1832 if (!publicOnly || method->is_public()) {
1833 idnums->push(method->method_idnum());
1834 ++num_methods;
1835 }
1836 }
1837 }
1838
1839 // Allocate result
1840 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1841 objArrayHandle result (THREAD, r);
1842
1843 // Now just put the methods that we selected above, but go by their idnum
1844 // in case of redefinition. The methods can be redefined at any safepoint,
1845 // so above when allocating the oop array and below when creating reflect
1846 // objects.
1847 for (int i = 0; i < num_methods; i++) {
1848 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1849 if (method.is_null()) {
1850 // Method may have been deleted and seems this API can handle null
1851 // Otherwise should probably put a method that throws NSME
1852 result->obj_at_put(i, NULL);
1853 } else {
1854 oop m;
1855 if (want_constructor) {
1856 m = Reflection::new_constructor(method, CHECK_NULL);
1857 } else {
1858 m = Reflection::new_method(method, false, CHECK_NULL);
1859 }
1860 result->obj_at_put(i, m);
1861 }
1862 }
1863
1864 return (jobjectArray) JNIHandles::make_local(env, result());
1865 }
1866
1867 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1868 {
1869 JVMWrapper("JVM_GetClassDeclaredMethods");
1870 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1871 /*want_constructor*/ false,
1872 SystemDictionary::reflect_Method_klass(), THREAD);
1873 }
1874 JVM_END
1875
1876 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1877 {
1878 JVMWrapper("JVM_GetClassDeclaredConstructors");
1879 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1880 /*want_constructor*/ true,
1881 SystemDictionary::reflect_Constructor_klass(), THREAD);
1882 }
1883 JVM_END
1884
1885 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1886 {
1887 JVMWrapper("JVM_GetClassAccessFlags");
1888 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1889 // Primitive type
1890 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1891 }
1892
1893 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1894 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1895 }
1896 JVM_END
1897
1898 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1899 {
1900 JVMWrapper("JVM_AreNestMates");
1901 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1902 assert(c->is_instance_klass(), "must be");
1903 InstanceKlass* ck = InstanceKlass::cast(c);
1904 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1905 assert(m->is_instance_klass(), "must be");
1906 InstanceKlass* mk = InstanceKlass::cast(m);
1907 return ck->has_nestmate_access_to(mk, THREAD);
1908 }
1909 JVM_END
1910
1911 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1912 {
1913 // current is not a primitive or array class
1914 JVMWrapper("JVM_GetNestHost");
1915 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1916 assert(c->is_instance_klass(), "must be");
1917 InstanceKlass* ck = InstanceKlass::cast(c);
1918 // Don't post exceptions if validation fails
1919 InstanceKlass* host = ck->nest_host(NULL, THREAD);
1920 return (jclass) (host == NULL ? NULL :
1921 JNIHandles::make_local(THREAD, host->java_mirror()));
1922 }
1923 JVM_END
1924
1925 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1926 {
1927 // current is not a primitive or array class
1928 JVMWrapper("JVM_GetNestMembers");
1929 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1930 assert(c->is_instance_klass(), "must be");
1931 InstanceKlass* ck = InstanceKlass::cast(c);
1932 // Get the nest host for this nest - throw ICCE if validation fails
1933 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
1934 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
1935
1936 {
1937 JvmtiVMObjectAllocEventCollector oam;
1938 Array<u2>* members = host->nest_members();
1939 int length = members == NULL ? 0 : members->length();
1940 // nest host is first in the array so make it one bigger
1941 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
1942 length + 1, CHECK_NULL);
1943 objArrayHandle result (THREAD, r);
1944 result->obj_at_put(0, host->java_mirror());
1945 if (length != 0) {
1946 int i;
1947 for (i = 0; i < length; i++) {
1948 int cp_index = members->at(i);
1949 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
1950 if (k->is_instance_klass()) {
1951 InstanceKlass* nest_host_k =
1952 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
1953 if (nest_host_k == host) {
1954 result->obj_at_put(i+1, k->java_mirror());
1955 }
1956 else {
1957 // k's nest host is legal but it isn't our host so
1958 // throw ICCE
1959 ResourceMark rm(THREAD);
1960 Exceptions::fthrow(THREAD_AND_LOCATION,
1961 icce,
1962 "Nest member %s in %s declares a different nest host of %s",
1963 k->external_name(),
1964 host->external_name(),
1965 nest_host_k->external_name()
1966 );
1967 return NULL;
1968 }
1969 }
1970 else {
1971 // we have a bad nest member entry - throw ICCE
1972 ResourceMark rm(THREAD);
1973 Exceptions::fthrow(THREAD_AND_LOCATION,
1974 icce,
1975 "Class %s can not be a nest member of %s",
1976 k->external_name(),
1977 host->external_name()
1978 );
1979 return NULL;
1980 }
1981 }
1982 }
1983 else {
1984 assert(host == ck, "must be singleton nest");
1985 }
1986 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1987 }
1988 }
1989 JVM_END
1990
1991 // Constant pool access //////////////////////////////////////////////////////////
1992
1993 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1994 {
1995 JVMWrapper("JVM_GetClassConstantPool");
1996 JvmtiVMObjectAllocEventCollector oam;
1997
1998 // Return null for primitives and arrays
1999 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2000 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2001 if (k->is_instance_klass()) {
2002 InstanceKlass* k_h = InstanceKlass::cast(k);
2003 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2004 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2005 return JNIHandles::make_local(jcp());
2006 }
2007 }
2008 return NULL;
2009 }
2010 JVM_END
2011
2012
2013 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2014 {
2015 JVMWrapper("JVM_ConstantPoolGetSize");
2016 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2017 return cp->length();
2018 }
2019 JVM_END
2020
2021
2022 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2023 {
2024 JVMWrapper("JVM_ConstantPoolGetClassAt");
2025 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2026 bounds_check(cp, index, CHECK_NULL);
2027 constantTag tag = cp->tag_at(index);
2028 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2029 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2030 }
2031 Klass* k = cp->klass_at(index, CHECK_NULL);
2032 return (jclass) JNIHandles::make_local(k->java_mirror());
2033 }
2034 JVM_END
2035
2036 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2037 {
2038 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2039 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2040 bounds_check(cp, index, CHECK_NULL);
2041 constantTag tag = cp->tag_at(index);
2042 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2043 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2044 }
2045 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2046 if (k == NULL) return NULL;
2047 return (jclass) JNIHandles::make_local(k->java_mirror());
2048 }
2049 JVM_END
2050
2051 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2052 constantTag tag = cp->tag_at(index);
2053 if (!tag.is_method() && !tag.is_interface_method()) {
2054 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2055 }
2056 int klass_ref = cp->uncached_klass_ref_index_at(index);
2057 Klass* k_o;
2058 if (force_resolution) {
2059 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2060 } else {
2061 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2062 if (k_o == NULL) return NULL;
2063 }
2064 InstanceKlass* k = InstanceKlass::cast(k_o);
2065 Symbol* name = cp->uncached_name_ref_at(index);
2066 Symbol* sig = cp->uncached_signature_ref_at(index);
2067 methodHandle m (THREAD, k->find_method(name, sig));
2068 if (m.is_null()) {
2069 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2070 }
2071 oop method;
2072 if (!m->is_initializer() || m->is_static()) {
2073 method = Reflection::new_method(m, true, CHECK_NULL);
2074 } else {
2075 method = Reflection::new_constructor(m, CHECK_NULL);
2076 }
2077 return JNIHandles::make_local(method);
2078 }
2079
2080 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2081 {
2082 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2083 JvmtiVMObjectAllocEventCollector oam;
2084 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2085 bounds_check(cp, index, CHECK_NULL);
2086 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2087 return res;
2088 }
2089 JVM_END
2090
2091 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2092 {
2093 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2094 JvmtiVMObjectAllocEventCollector oam;
2095 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2096 bounds_check(cp, index, CHECK_NULL);
2097 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2098 return res;
2099 }
2100 JVM_END
2101
2102 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2103 constantTag tag = cp->tag_at(index);
2104 if (!tag.is_field()) {
2105 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2106 }
2107 int klass_ref = cp->uncached_klass_ref_index_at(index);
2108 Klass* k_o;
2109 if (force_resolution) {
2110 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2111 } else {
2112 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2113 if (k_o == NULL) return NULL;
2114 }
2115 InstanceKlass* k = InstanceKlass::cast(k_o);
2116 Symbol* name = cp->uncached_name_ref_at(index);
2117 Symbol* sig = cp->uncached_signature_ref_at(index);
2118 fieldDescriptor fd;
2119 Klass* target_klass = k->find_field(name, sig, &fd);
2120 if (target_klass == NULL) {
2121 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2122 }
2123 oop field = Reflection::new_field(&fd, CHECK_NULL);
2124 return JNIHandles::make_local(field);
2125 }
2126
2127 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2128 {
2129 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2130 JvmtiVMObjectAllocEventCollector oam;
2131 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2132 bounds_check(cp, index, CHECK_NULL);
2133 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2134 return res;
2135 }
2136 JVM_END
2137
2138 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2139 {
2140 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2141 JvmtiVMObjectAllocEventCollector oam;
2142 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2143 bounds_check(cp, index, CHECK_NULL);
2144 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2145 return res;
2146 }
2147 JVM_END
2148
2149 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2150 {
2151 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2152 JvmtiVMObjectAllocEventCollector oam;
2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2154 bounds_check(cp, index, CHECK_NULL);
2155 constantTag tag = cp->tag_at(index);
2156 if (!tag.is_field_or_method()) {
2157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2158 }
2159 int klass_ref = cp->uncached_klass_ref_index_at(index);
2160 Symbol* klass_name = cp->klass_name_at(klass_ref);
2161 Symbol* member_name = cp->uncached_name_ref_at(index);
2162 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2163 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2164 objArrayHandle dest(THREAD, dest_o);
2165 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2166 dest->obj_at_put(0, str());
2167 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2168 dest->obj_at_put(1, str());
2169 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2170 dest->obj_at_put(2, str());
2171 return (jobjectArray) JNIHandles::make_local(dest());
2172 }
2173 JVM_END
2174
2175 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2176 {
2177 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2178 JvmtiVMObjectAllocEventCollector oam;
2179 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2180 bounds_check(cp, index, CHECK_0);
2181 constantTag tag = cp->tag_at(index);
2182 if (!tag.is_field_or_method()) {
2183 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2184 }
2185 return (jint) cp->uncached_klass_ref_index_at(index);
2186 }
2187 JVM_END
2188
2189 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2190 {
2191 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2192 JvmtiVMObjectAllocEventCollector oam;
2193 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2194 bounds_check(cp, index, CHECK_0);
2195 constantTag tag = cp->tag_at(index);
2196 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2197 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2198 }
2199 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2200 }
2201 JVM_END
2202
2203 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2204 {
2205 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2206 JvmtiVMObjectAllocEventCollector oam;
2207 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2208 bounds_check(cp, index, CHECK_NULL);
2209 constantTag tag = cp->tag_at(index);
2210 if (!tag.is_name_and_type()) {
2211 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2212 }
2213 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2214 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2215 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2216 objArrayHandle dest(THREAD, dest_o);
2217 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2218 dest->obj_at_put(0, str());
2219 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2220 dest->obj_at_put(1, str());
2221 return (jobjectArray) JNIHandles::make_local(dest());
2222 }
2223 JVM_END
2224
2225 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2226 {
2227 JVMWrapper("JVM_ConstantPoolGetIntAt");
2228 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2229 bounds_check(cp, index, CHECK_0);
2230 constantTag tag = cp->tag_at(index);
2231 if (!tag.is_int()) {
2232 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2233 }
2234 return cp->int_at(index);
2235 }
2236 JVM_END
2237
2238 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2239 {
2240 JVMWrapper("JVM_ConstantPoolGetLongAt");
2241 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2242 bounds_check(cp, index, CHECK_(0L));
2243 constantTag tag = cp->tag_at(index);
2244 if (!tag.is_long()) {
2245 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2246 }
2247 return cp->long_at(index);
2248 }
2249 JVM_END
2250
2251 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2252 {
2253 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2254 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2255 bounds_check(cp, index, CHECK_(0.0f));
2256 constantTag tag = cp->tag_at(index);
2257 if (!tag.is_float()) {
2258 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2259 }
2260 return cp->float_at(index);
2261 }
2262 JVM_END
2263
2264 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2265 {
2266 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2267 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2268 bounds_check(cp, index, CHECK_(0.0));
2269 constantTag tag = cp->tag_at(index);
2270 if (!tag.is_double()) {
2271 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2272 }
2273 return cp->double_at(index);
2274 }
2275 JVM_END
2276
2277 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2278 {
2279 JVMWrapper("JVM_ConstantPoolGetStringAt");
2280 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2281 bounds_check(cp, index, CHECK_NULL);
2282 constantTag tag = cp->tag_at(index);
2283 if (!tag.is_string()) {
2284 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2285 }
2286 oop str = cp->string_at(index, CHECK_NULL);
2287 return (jstring) JNIHandles::make_local(str);
2288 }
2289 JVM_END
2290
2291 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2292 {
2293 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2294 JvmtiVMObjectAllocEventCollector oam;
2295 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2296 bounds_check(cp, index, CHECK_NULL);
2297 constantTag tag = cp->tag_at(index);
2298 if (!tag.is_symbol()) {
2299 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2300 }
2301 Symbol* sym = cp->symbol_at(index);
2302 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2303 return (jstring) JNIHandles::make_local(str());
2304 }
2305 JVM_END
2306
2307 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2308 {
2309 JVMWrapper("JVM_ConstantPoolGetTagAt");
2310 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2311 bounds_check(cp, index, CHECK_0);
2312 constantTag tag = cp->tag_at(index);
2313 jbyte result = tag.value();
2314 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2315 // they are changed to the corresponding tags from the JVM spec, so that java code in
2316 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2317 if (tag.is_klass_or_reference()) {
2318 result = JVM_CONSTANT_Class;
2319 } else if (tag.is_string_index()) {
2320 result = JVM_CONSTANT_String;
2321 } else if (tag.is_method_type_in_error()) {
2322 result = JVM_CONSTANT_MethodType;
2323 } else if (tag.is_method_handle_in_error()) {
2324 result = JVM_CONSTANT_MethodHandle;
2325 } else if (tag.is_dynamic_constant_in_error()) {
2326 result = JVM_CONSTANT_Dynamic;
2327 }
2328 return result;
2329 }
2330 JVM_END
2331
2332 // Assertion support. //////////////////////////////////////////////////////////
2333
2334 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2335 JVMWrapper("JVM_DesiredAssertionStatus");
2336 assert(cls != NULL, "bad class");
2337
2338 oop r = JNIHandles::resolve(cls);
2339 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2340 if (java_lang_Class::is_primitive(r)) return false;
2341
2342 Klass* k = java_lang_Class::as_Klass(r);
2343 assert(k->is_instance_klass(), "must be an instance klass");
2344 if (!k->is_instance_klass()) return false;
2345
2346 ResourceMark rm(THREAD);
2347 const char* name = k->name()->as_C_string();
2348 bool system_class = k->class_loader() == NULL;
2349 return JavaAssertions::enabled(name, system_class);
2350
2351 JVM_END
2352
2353
2354 // Return a new AssertionStatusDirectives object with the fields filled in with
2355 // command-line assertion arguments (i.e., -ea, -da).
2356 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2357 JVMWrapper("JVM_AssertionStatusDirectives");
2358 JvmtiVMObjectAllocEventCollector oam;
2359 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2360 return JNIHandles::make_local(env, asd);
2361 JVM_END
2362
2363 // Verification ////////////////////////////////////////////////////////////////////////////////
2364
2365 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2366
2367 // RedefineClasses support: bug 6214132 caused verification to fail.
2368 // All functions from this section should call the jvmtiThreadSate function:
2369 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2370 // The function returns a Klass* of the _scratch_class if the verifier
2371 // was invoked in the middle of the class redefinition.
2372 // Otherwise it returns its argument value which is the _the_class Klass*.
2373 // Please, refer to the description in the jvmtiThreadSate.hpp.
2374
2375 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2376 JVMWrapper("JVM_GetClassNameUTF");
2377 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2378 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2379 return k->name()->as_utf8();
2380 JVM_END
2381
2382
2383 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2384 JVMWrapper("JVM_GetClassCPTypes");
2385 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2386 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2387 // types will have length zero if this is not an InstanceKlass
2388 // (length is determined by call to JVM_GetClassCPEntriesCount)
2389 if (k->is_instance_klass()) {
2390 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2391 for (int index = cp->length() - 1; index >= 0; index--) {
2392 constantTag tag = cp->tag_at(index);
2393 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2394 }
2395 }
2396 JVM_END
2397
2398
2399 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2400 JVMWrapper("JVM_GetClassCPEntriesCount");
2401 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2402 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2403 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2404 JVM_END
2405
2406
2407 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2408 JVMWrapper("JVM_GetClassFieldsCount");
2409 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2410 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2411 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2412 JVM_END
2413
2414
2415 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2416 JVMWrapper("JVM_GetClassMethodsCount");
2417 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2418 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2419 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2420 JVM_END
2421
2422
2423 // The following methods, used for the verifier, are never called with
2424 // array klasses, so a direct cast to InstanceKlass is safe.
2425 // Typically, these methods are called in a loop with bounds determined
2426 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2427 // zero for arrays.
2428 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2429 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2430 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2431 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2432 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2433 int length = method->checked_exceptions_length();
2434 if (length > 0) {
2435 CheckedExceptionElement* table= method->checked_exceptions_start();
2436 for (int i = 0; i < length; i++) {
2437 exceptions[i] = table[i].class_cp_index;
2438 }
2439 }
2440 JVM_END
2441
2442
2443 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2444 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2445 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2446 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2447 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2448 return method->checked_exceptions_length();
2449 JVM_END
2450
2451
2452 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2453 JVMWrapper("JVM_GetMethodIxByteCode");
2454 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2455 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2456 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2457 memcpy(code, method->code_base(), method->code_size());
2458 JVM_END
2459
2460
2461 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2462 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2463 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2464 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2465 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2466 return method->code_size();
2467 JVM_END
2468
2469
2470 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2471 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
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 ExceptionTable extable(method);
2476 entry->start_pc = extable.start_pc(entry_index);
2477 entry->end_pc = extable.end_pc(entry_index);
2478 entry->handler_pc = extable.handler_pc(entry_index);
2479 entry->catchType = extable.catch_type_index(entry_index);
2480 JVM_END
2481
2482
2483 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2484 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2485 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2486 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2487 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2488 return method->exception_table_length();
2489 JVM_END
2490
2491
2492 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2493 JVMWrapper("JVM_GetMethodIxModifiers");
2494 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2495 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2496 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2497 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2498 JVM_END
2499
2500
2501 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2502 JVMWrapper("JVM_GetFieldIxModifiers");
2503 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2504 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2505 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2506 JVM_END
2507
2508
2509 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2510 JVMWrapper("JVM_GetMethodIxLocalsCount");
2511 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2512 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2513 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2514 return method->max_locals();
2515 JVM_END
2516
2517
2518 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2519 JVMWrapper("JVM_GetMethodIxArgsSize");
2520 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2521 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2522 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2523 return method->size_of_parameters();
2524 JVM_END
2525
2526
2527 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2528 JVMWrapper("JVM_GetMethodIxMaxStack");
2529 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2530 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2531 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2532 return method->verifier_max_stack();
2533 JVM_END
2534
2535
2536 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2537 JVMWrapper("JVM_IsConstructorIx");
2538 ResourceMark rm(THREAD);
2539 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2540 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2541 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2542 return method->name() == vmSymbols::object_initializer_name();
2543 JVM_END
2544
2545
2546 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2547 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2548 ResourceMark rm(THREAD);
2549 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2550 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2551 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2552 return method->is_overpass();
2553 JVM_END
2554
2555 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2556 JVMWrapper("JVM_GetMethodIxIxUTF");
2557 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2558 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2559 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2560 return method->name()->as_utf8();
2561 JVM_END
2562
2563
2564 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2565 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2566 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2567 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2568 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2569 return method->signature()->as_utf8();
2570 JVM_END
2571
2572 /**
2573 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2574 * read entries in the constant pool. Since the old verifier always
2575 * works on a copy of the code, it will not see any rewriting that
2576 * may possibly occur in the middle of verification. So it is important
2577 * that nothing it calls tries to use the cpCache instead of the raw
2578 * constant pool, so we must use cp->uncached_x methods when appropriate.
2579 */
2580 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2581 JVMWrapper("JVM_GetCPFieldNameUTF");
2582 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2583 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2584 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2585 switch (cp->tag_at(cp_index).value()) {
2586 case JVM_CONSTANT_Fieldref:
2587 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2588 default:
2589 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2590 }
2591 ShouldNotReachHere();
2592 return NULL;
2593 JVM_END
2594
2595
2596 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2597 JVMWrapper("JVM_GetCPMethodNameUTF");
2598 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2599 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2600 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2601 switch (cp->tag_at(cp_index).value()) {
2602 case JVM_CONSTANT_InterfaceMethodref:
2603 case JVM_CONSTANT_Methodref:
2604 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2605 default:
2606 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2607 }
2608 ShouldNotReachHere();
2609 return NULL;
2610 JVM_END
2611
2612
2613 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2614 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2615 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2616 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2617 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2618 switch (cp->tag_at(cp_index).value()) {
2619 case JVM_CONSTANT_InterfaceMethodref:
2620 case JVM_CONSTANT_Methodref:
2621 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2622 default:
2623 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2624 }
2625 ShouldNotReachHere();
2626 return NULL;
2627 JVM_END
2628
2629
2630 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2631 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2632 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2633 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2634 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2635 switch (cp->tag_at(cp_index).value()) {
2636 case JVM_CONSTANT_Fieldref:
2637 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2638 default:
2639 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2640 }
2641 ShouldNotReachHere();
2642 return NULL;
2643 JVM_END
2644
2645
2646 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2647 JVMWrapper("JVM_GetCPClassNameUTF");
2648 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2649 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2650 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2651 Symbol* classname = cp->klass_name_at(cp_index);
2652 return classname->as_utf8();
2653 JVM_END
2654
2655
2656 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2657 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2658 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2659 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2660 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2661 switch (cp->tag_at(cp_index).value()) {
2662 case JVM_CONSTANT_Fieldref: {
2663 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2664 Symbol* classname = cp->klass_name_at(class_index);
2665 return classname->as_utf8();
2666 }
2667 default:
2668 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2669 }
2670 ShouldNotReachHere();
2671 return NULL;
2672 JVM_END
2673
2674
2675 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2676 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2677 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2678 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2679 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2680 switch (cp->tag_at(cp_index).value()) {
2681 case JVM_CONSTANT_Methodref:
2682 case JVM_CONSTANT_InterfaceMethodref: {
2683 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2684 Symbol* classname = cp->klass_name_at(class_index);
2685 return classname->as_utf8();
2686 }
2687 default:
2688 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2689 }
2690 ShouldNotReachHere();
2691 return NULL;
2692 JVM_END
2693
2694
2695 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2696 JVMWrapper("JVM_GetCPFieldModifiers");
2697 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2698 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2699 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2700 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2701 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2702 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2703 switch (cp->tag_at(cp_index).value()) {
2704 case JVM_CONSTANT_Fieldref: {
2705 Symbol* name = cp->uncached_name_ref_at(cp_index);
2706 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2707 InstanceKlass* ik = InstanceKlass::cast(k_called);
2708 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2709 if (fs.name() == name && fs.signature() == signature) {
2710 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2711 }
2712 }
2713 return -1;
2714 }
2715 default:
2716 fatal("JVM_GetCPFieldModifiers: illegal constant");
2717 }
2718 ShouldNotReachHere();
2719 return 0;
2720 JVM_END
2721
2722
2723 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2724 JVMWrapper("JVM_GetCPMethodModifiers");
2725 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2726 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2727 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2728 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2729 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2730 switch (cp->tag_at(cp_index).value()) {
2731 case JVM_CONSTANT_Methodref:
2732 case JVM_CONSTANT_InterfaceMethodref: {
2733 Symbol* name = cp->uncached_name_ref_at(cp_index);
2734 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2735 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2736 int methods_count = methods->length();
2737 for (int i = 0; i < methods_count; i++) {
2738 Method* method = methods->at(i);
2739 if (method->name() == name && method->signature() == signature) {
2740 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2741 }
2742 }
2743 return -1;
2744 }
2745 default:
2746 fatal("JVM_GetCPMethodModifiers: illegal constant");
2747 }
2748 ShouldNotReachHere();
2749 return 0;
2750 JVM_END
2751
2752
2753 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2754
2755 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2756 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2757 JVM_END
2758
2759
2760 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2761 JVMWrapper("JVM_IsSameClassPackage");
2762 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2763 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2764 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2765 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2766 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2767 JVM_END
2768
2769 // Printing support //////////////////////////////////////////////////
2770 extern "C" {
2771
2772 ATTRIBUTE_PRINTF(3, 0)
2773 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2774 // Reject count values that are negative signed values converted to
2775 // unsigned; see bug 4399518, 4417214
2776 if ((intptr_t)count <= 0) return -1;
2777
2778 int result = os::vsnprintf(str, count, fmt, args);
2779 if (result > 0 && (size_t)result >= count) {
2780 result = -1;
2781 }
2782
2783 return result;
2784 }
2785
2786 ATTRIBUTE_PRINTF(3, 4)
2787 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2788 va_list args;
2789 int len;
2790 va_start(args, fmt);
2791 len = jio_vsnprintf(str, count, fmt, args);
2792 va_end(args);
2793 return len;
2794 }
2795
2796 ATTRIBUTE_PRINTF(2, 3)
2797 int jio_fprintf(FILE* f, const char *fmt, ...) {
2798 int len;
2799 va_list args;
2800 va_start(args, fmt);
2801 len = jio_vfprintf(f, fmt, args);
2802 va_end(args);
2803 return len;
2804 }
2805
2806 ATTRIBUTE_PRINTF(2, 0)
2807 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2808 if (Arguments::vfprintf_hook() != NULL) {
2809 return Arguments::vfprintf_hook()(f, fmt, args);
2810 } else {
2811 return vfprintf(f, fmt, args);
2812 }
2813 }
2814
2815 ATTRIBUTE_PRINTF(1, 2)
2816 JNIEXPORT int jio_printf(const char *fmt, ...) {
2817 int len;
2818 va_list args;
2819 va_start(args, fmt);
2820 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2821 va_end(args);
2822 return len;
2823 }
2824
2825 // HotSpot specific jio method
2826 void jio_print(const char* s, size_t len) {
2827 // Try to make this function as atomic as possible.
2828 if (Arguments::vfprintf_hook() != NULL) {
2829 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2830 } else {
2831 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2832 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2833 }
2834 }
2835
2836 } // Extern C
2837
2838 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2839
2840 // In most of the JVM thread support functions we need to access the
2841 // thread through a ThreadsListHandle to prevent it from exiting and
2842 // being reclaimed while we try to operate on it. The exceptions to this
2843 // rule are when operating on the current thread, or if the monitor of
2844 // the target java.lang.Thread is locked at the Java level - in both
2845 // cases the target cannot exit.
2846
2847 static void thread_entry(JavaThread* thread, TRAPS) {
2848 HandleMark hm(THREAD);
2849 Handle obj(THREAD, thread->threadObj());
2850 JavaValue result(T_VOID);
2851 JavaCalls::call_virtual(&result,
2852 obj,
2853 SystemDictionary::Thread_klass(),
2854 vmSymbols::run_method_name(),
2855 vmSymbols::void_method_signature(),
2856 THREAD);
2857 }
2858
2859
2860 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2861 JVMWrapper("JVM_StartThread");
2862 JavaThread *native_thread = NULL;
2863
2864 // We cannot hold the Threads_lock when we throw an exception,
2865 // due to rank ordering issues. Example: we might need to grab the
2866 // Heap_lock while we construct the exception.
2867 bool throw_illegal_thread_state = false;
2868
2869 // We must release the Threads_lock before we can post a jvmti event
2870 // in Thread::start.
2871 {
2872 // Ensure that the C++ Thread and OSThread structures aren't freed before
2873 // we operate.
2874 MutexLocker mu(Threads_lock);
2875
2876 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2877 // re-starting an already started thread, so we should usually find
2878 // that the JavaThread is null. However for a JNI attached thread
2879 // there is a small window between the Thread object being created
2880 // (with its JavaThread set) and the update to its threadStatus, so we
2881 // have to check for this
2882 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2883 throw_illegal_thread_state = true;
2884 } else {
2885 // We could also check the stillborn flag to see if this thread was already stopped, but
2886 // for historical reasons we let the thread detect that itself when it starts running
2887
2888 jlong size =
2889 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2890 // Allocate the C++ Thread structure and create the native thread. The
2891 // stack size retrieved from java is 64-bit signed, but the constructor takes
2892 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2893 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2894 // - Avoid passing negative values which would result in really large stacks.
2895 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2896 size_t sz = size > 0 ? (size_t) size : 0;
2897 native_thread = new JavaThread(&thread_entry, sz);
2898
2899 // At this point it may be possible that no osthread was created for the
2900 // JavaThread due to lack of memory. Check for this situation and throw
2901 // an exception if necessary. Eventually we may want to change this so
2902 // that we only grab the lock if the thread was created successfully -
2903 // then we can also do this check and throw the exception in the
2904 // JavaThread constructor.
2905 if (native_thread->osthread() != NULL) {
2906 // Note: the current thread is not being used within "prepare".
2907 native_thread->prepare(jthread);
2908 }
2909 }
2910 }
2911
2912 if (throw_illegal_thread_state) {
2913 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2914 }
2915
2916 assert(native_thread != NULL, "Starting null thread?");
2917
2918 if (native_thread->osthread() == NULL) {
2919 // No one should hold a reference to the 'native_thread'.
2920 native_thread->smr_delete();
2921 if (JvmtiExport::should_post_resource_exhausted()) {
2922 JvmtiExport::post_resource_exhausted(
2923 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2924 os::native_thread_creation_failed_msg());
2925 }
2926 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2927 os::native_thread_creation_failed_msg());
2928 }
2929
2930 Thread::start(native_thread);
2931
2932 JVM_END
2933
2934
2935 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2936 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2937 // but is thought to be reliable and simple. In the case, where the receiver is the
2938 // same thread as the sender, no VM_Operation is needed.
2939 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2940 JVMWrapper("JVM_StopThread");
2941
2942 // A nested ThreadsListHandle will grab the Threads_lock so create
2943 // tlh before we resolve throwable.
2944 ThreadsListHandle tlh(thread);
2945 oop java_throwable = JNIHandles::resolve(throwable);
2946 if (java_throwable == NULL) {
2947 THROW(vmSymbols::java_lang_NullPointerException());
2948 }
2949 oop java_thread = NULL;
2950 JavaThread* receiver = NULL;
2951 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2952 Events::log_exception(thread,
2953 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2954 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2955
2956 if (is_alive) {
2957 // jthread refers to a live JavaThread.
2958 if (thread == receiver) {
2959 // Exception is getting thrown at self so no VM_Operation needed.
2960 THROW_OOP(java_throwable);
2961 } else {
2962 // Use a VM_Operation to throw the exception.
2963 Thread::send_async_exception(java_thread, java_throwable);
2964 }
2965 } else {
2966 // Either:
2967 // - target thread has not been started before being stopped, or
2968 // - target thread already terminated
2969 // We could read the threadStatus to determine which case it is
2970 // but that is overkill as it doesn't matter. We must set the
2971 // stillborn flag for the first case, and if the thread has already
2972 // exited setting this flag has no effect.
2973 java_lang_Thread::set_stillborn(java_thread);
2974 }
2975 JVM_END
2976
2977
2978 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2979 JVMWrapper("JVM_IsThreadAlive");
2980
2981 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2982 return java_lang_Thread::is_alive(thread_oop);
2983 JVM_END
2984
2985
2986 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2987 JVMWrapper("JVM_SuspendThread");
2988
2989 ThreadsListHandle tlh(thread);
2990 JavaThread* receiver = NULL;
2991 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2992 if (is_alive) {
2993 // jthread refers to a live JavaThread.
2994 {
2995 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2996 if (receiver->is_external_suspend()) {
2997 // Don't allow nested external suspend requests. We can't return
2998 // an error from this interface so just ignore the problem.
2999 return;
3000 }
3001 if (receiver->is_exiting()) { // thread is in the process of exiting
3002 return;
3003 }
3004 receiver->set_external_suspend();
3005 }
3006
3007 // java_suspend() will catch threads in the process of exiting
3008 // and will ignore them.
3009 receiver->java_suspend();
3010
3011 // It would be nice to have the following assertion in all the
3012 // time, but it is possible for a racing resume request to have
3013 // resumed this thread right after we suspended it. Temporarily
3014 // enable this assertion if you are chasing a different kind of
3015 // bug.
3016 //
3017 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3018 // receiver->is_being_ext_suspended(), "thread is not suspended");
3019 }
3020 JVM_END
3021
3022
3023 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3024 JVMWrapper("JVM_ResumeThread");
3025
3026 ThreadsListHandle tlh(thread);
3027 JavaThread* receiver = NULL;
3028 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3029 if (is_alive) {
3030 // jthread refers to a live JavaThread.
3031
3032 // This is the original comment for this Threads_lock grab:
3033 // We need to *always* get the threads lock here, since this operation cannot be allowed during
3034 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3035 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3036 // looks at it.
3037 //
3038 // The above comment dates back to when we had both internal and
3039 // external suspend APIs that shared a common underlying mechanism.
3040 // External suspend is now entirely cooperative and doesn't share
3041 // anything with internal suspend. That said, there are some
3042 // assumptions in the VM that an external resume grabs the
3043 // Threads_lock. We can't drop the Threads_lock grab here until we
3044 // resolve the assumptions that exist elsewhere.
3045 //
3046 MutexLocker ml(Threads_lock);
3047 receiver->java_resume();
3048 }
3049 JVM_END
3050
3051
3052 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3053 JVMWrapper("JVM_SetThreadPriority");
3054
3055 ThreadsListHandle tlh(thread);
3056 oop java_thread = NULL;
3057 JavaThread* receiver = NULL;
3058 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3059 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3060
3061 if (is_alive) {
3062 // jthread refers to a live JavaThread.
3063 Thread::set_priority(receiver, (ThreadPriority)prio);
3064 }
3065 // Implied else: If the JavaThread hasn't started yet, then the
3066 // priority set in the java.lang.Thread object above will be pushed
3067 // down when it does start.
3068 JVM_END
3069
3070
3071 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3072 JVMWrapper("JVM_Yield");
3073 if (os::dont_yield()) return;
3074 HOTSPOT_THREAD_YIELD();
3075 os::naked_yield();
3076 JVM_END
3077
3078 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3079 assert(event != NULL, "invariant");
3080 assert(event->should_commit(), "invariant");
3081 event->set_time(millis);
3082 event->commit();
3083 }
3084
3085 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3086 JVMWrapper("JVM_Sleep");
3087
3088 if (millis < 0) {
3089 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3090 }
3091
3092 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3093 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3094 }
3095
3096 // Save current thread state and restore it at the end of this block.
3097 // And set new thread state to SLEEPING.
3098 JavaThreadSleepState jtss(thread);
3099
3100 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3101 EventThreadSleep event;
3102
3103 if (millis == 0) {
3104 os::naked_yield();
3105 } else {
3106 ThreadState old_state = thread->osthread()->get_state();
3107 thread->osthread()->set_state(SLEEPING);
3108 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3109 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3110 // us while we were sleeping. We do not overwrite those.
3111 if (!HAS_PENDING_EXCEPTION) {
3112 if (event.should_commit()) {
3113 post_thread_sleep_event(&event, millis);
3114 }
3115 HOTSPOT_THREAD_SLEEP_END(1);
3116
3117 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3118 // to properly restore the thread state. That's likely wrong.
3119 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3120 }
3121 }
3122 thread->osthread()->set_state(old_state);
3123 }
3124 if (event.should_commit()) {
3125 post_thread_sleep_event(&event, millis);
3126 }
3127 HOTSPOT_THREAD_SLEEP_END(0);
3128 JVM_END
3129
3130 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3131 JVMWrapper("JVM_CurrentThread");
3132 oop jthread = thread->threadObj();
3133 assert (thread != NULL, "no current thread!");
3134 return JNIHandles::make_local(env, jthread);
3135 JVM_END
3136
3137
3138 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3139 JVMWrapper("JVM_CountStackFrames");
3140
3141 uint32_t debug_bits = 0;
3142 ThreadsListHandle tlh(thread);
3143 JavaThread* receiver = NULL;
3144 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3145 int count = 0;
3146 if (is_alive) {
3147 // jthread refers to a live JavaThread.
3148 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
3149 // Count all java activation, i.e., number of vframes.
3150 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) {
3151 // Native frames are not counted.
3152 if (!vfst.method()->is_native()) count++;
3153 }
3154 } else {
3155 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3156 "this thread is not suspended");
3157 }
3158 }
3159 // Implied else: if JavaThread is not alive simply return a count of 0.
3160
3161 return count;
3162 JVM_END
3163
3164
3165 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3166 JVMWrapper("JVM_Interrupt");
3167
3168 ThreadsListHandle tlh(thread);
3169 JavaThread* receiver = NULL;
3170 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3171 if (is_alive) {
3172 // jthread refers to a live JavaThread.
3173 Thread::interrupt(receiver);
3174 }
3175 JVM_END
3176
3177
3178 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3179 JVMWrapper("JVM_IsInterrupted");
3180
3181 ThreadsListHandle tlh(thread);
3182 JavaThread* receiver = NULL;
3183 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3184 if (is_alive) {
3185 // jthread refers to a live JavaThread.
3186 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3187 } else {
3188 return JNI_FALSE;
3189 }
3190 JVM_END
3191
3192
3193 // Return true iff the current thread has locked the object passed in
3194
3195 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3196 JVMWrapper("JVM_HoldsLock");
3197 assert(THREAD->is_Java_thread(), "sanity check");
3198 if (obj == NULL) {
3199 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3200 }
3201 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3202 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3203 JVM_END
3204
3205
3206 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3207 JVMWrapper("JVM_DumpAllStacks");
3208 VM_PrintThreads op;
3209 VMThread::execute(&op);
3210 if (JvmtiExport::should_post_data_dump()) {
3211 JvmtiExport::post_data_dump();
3212 }
3213 JVM_END
3214
3215 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3216 JVMWrapper("JVM_SetNativeThreadName");
3217
3218 // We don't use a ThreadsListHandle here because the current thread
3219 // must be alive.
3220 oop java_thread = JNIHandles::resolve_non_null(jthread);
3221 JavaThread* thr = java_lang_Thread::thread(java_thread);
3222 if (thread == thr && !thr->has_attached_via_jni()) {
3223 // Thread naming is only supported for the current thread and
3224 // we don't set the name of an attached thread to avoid stepping
3225 // on other programs.
3226 ResourceMark rm(thread);
3227 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3228 os::set_native_thread_name(thread_name);
3229 }
3230 JVM_END
3231
3232 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3233
3234 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3235 JVMWrapper("JVM_GetClassContext");
3236 ResourceMark rm(THREAD);
3237 JvmtiVMObjectAllocEventCollector oam;
3238 vframeStream vfst(thread);
3239
3240 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3241 // This must only be called from SecurityManager.getClassContext
3242 Method* m = vfst.method();
3243 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3244 m->name() == vmSymbols::getClassContext_name() &&
3245 m->signature() == vmSymbols::void_class_array_signature())) {
3246 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3247 }
3248 }
3249
3250 // Collect method holders
3251 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3252 for (; !vfst.at_end(); vfst.security_next()) {
3253 Method* m = vfst.method();
3254 // Native frames are not returned
3255 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3256 Klass* holder = m->method_holder();
3257 assert(holder->is_klass(), "just checking");
3258 klass_array->append(holder);
3259 }
3260 }
3261
3262 // Create result array of type [Ljava/lang/Class;
3263 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3264 // Fill in mirrors corresponding to method holders
3265 for (int i = 0; i < klass_array->length(); i++) {
3266 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3267 }
3268
3269 return (jobjectArray) JNIHandles::make_local(env, result);
3270 JVM_END
3271
3272
3273 // java.lang.Package ////////////////////////////////////////////////////////////////
3274
3275
3276 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3277 JVMWrapper("JVM_GetSystemPackage");
3278 ResourceMark rm(THREAD);
3279 JvmtiVMObjectAllocEventCollector oam;
3280 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3281 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3282 return (jstring) JNIHandles::make_local(result);
3283 JVM_END
3284
3285
3286 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3287 JVMWrapper("JVM_GetSystemPackages");
3288 JvmtiVMObjectAllocEventCollector oam;
3289 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3290 return (jobjectArray) JNIHandles::make_local(result);
3291 JVM_END
3292
3293
3294 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3295
3296
3297 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3298 JVMWrapper("JVM_GetAndClearReferencePendingList");
3299
3300 MonitorLockerEx ml(Heap_lock);
3301 oop ref = Universe::reference_pending_list();
3302 if (ref != NULL) {
3303 Universe::set_reference_pending_list(NULL);
3304 }
3305 return JNIHandles::make_local(env, ref);
3306 JVM_END
3307
3308 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3309 JVMWrapper("JVM_HasReferencePendingList");
3310 MonitorLockerEx ml(Heap_lock);
3311 return Universe::has_reference_pending_list();
3312 JVM_END
3313
3314 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3315 JVMWrapper("JVM_WaitForReferencePendingList");
3316 MonitorLockerEx ml(Heap_lock);
3317 while (!Universe::has_reference_pending_list()) {
3318 ml.wait();
3319 }
3320 JVM_END
3321
3322
3323 // ObjectInputStream ///////////////////////////////////////////////////////////////
3324
3325 // Return the first user-defined class loader up the execution stack, or null
3326 // if only code from the bootstrap or platform class loader is on the stack.
3327
3328 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3329 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3330 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3331 oop loader = vfst.method()->method_holder()->class_loader();
3332 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3333 return JNIHandles::make_local(env, loader);
3334 }
3335 }
3336 return NULL;
3337 JVM_END
3338
3339
3340 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3341
3342
3343 // resolve array handle and check arguments
3344 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3345 if (arr == NULL) {
3346 THROW_0(vmSymbols::java_lang_NullPointerException());
3347 }
3348 oop a = JNIHandles::resolve_non_null(arr);
3349 if (!a->is_array()) {
3350 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3351 } else if (type_array_only && !a->is_typeArray()) {
3352 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3353 }
3354 return arrayOop(a);
3355 }
3356
3357
3358 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3359 JVMWrapper("JVM_GetArrayLength");
3360 arrayOop a = check_array(env, arr, false, CHECK_0);
3361 return a->length();
3362 JVM_END
3363
3364
3365 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3366 JVMWrapper("JVM_Array_Get");
3367 JvmtiVMObjectAllocEventCollector oam;
3368 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3369 jvalue value;
3370 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3371 oop box = Reflection::box(&value, type, CHECK_NULL);
3372 return JNIHandles::make_local(env, box);
3373 JVM_END
3374
3375
3376 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3377 JVMWrapper("JVM_GetPrimitiveArrayElement");
3378 jvalue value;
3379 value.i = 0; // to initialize value before getting used in CHECK
3380 arrayOop a = check_array(env, arr, true, CHECK_(value));
3381 assert(a->is_typeArray(), "just checking");
3382 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3383 BasicType wide_type = (BasicType) wCode;
3384 if (type != wide_type) {
3385 Reflection::widen(&value, type, wide_type, CHECK_(value));
3386 }
3387 return value;
3388 JVM_END
3389
3390
3391 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3392 JVMWrapper("JVM_SetArrayElement");
3393 arrayOop a = check_array(env, arr, false, CHECK);
3394 oop box = JNIHandles::resolve(val);
3395 jvalue value;
3396 value.i = 0; // to initialize value before getting used in CHECK
3397 BasicType value_type;
3398 if (a->is_objArray()) {
3399 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3400 value_type = Reflection::unbox_for_regular_object(box, &value);
3401 } else {
3402 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3403 }
3404 Reflection::array_set(&value, a, index, value_type, CHECK);
3405 JVM_END
3406
3407
3408 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3409 JVMWrapper("JVM_SetPrimitiveArrayElement");
3410 arrayOop a = check_array(env, arr, true, CHECK);
3411 assert(a->is_typeArray(), "just checking");
3412 BasicType value_type = (BasicType) vCode;
3413 Reflection::array_set(&v, a, index, value_type, CHECK);
3414 JVM_END
3415
3416
3417 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3418 JVMWrapper("JVM_NewArray");
3419 JvmtiVMObjectAllocEventCollector oam;
3420 oop element_mirror = JNIHandles::resolve(eltClass);
3421 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3422 return JNIHandles::make_local(env, result);
3423 JVM_END
3424
3425
3426 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3427 JVMWrapper("JVM_NewMultiArray");
3428 JvmtiVMObjectAllocEventCollector oam;
3429 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3430 oop element_mirror = JNIHandles::resolve(eltClass);
3431 assert(dim_array->is_typeArray(), "just checking");
3432 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3433 return JNIHandles::make_local(env, result);
3434 JVM_END
3435
3436
3437 // Library support ///////////////////////////////////////////////////////////////////////////
3438
3439 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3440 //%note jvm_ct
3441 JVMWrapper("JVM_LoadLibrary");
3442 char ebuf[1024];
3443 void *load_result;
3444 {
3445 ThreadToNativeFromVM ttnfvm(thread);
3446 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3447 }
3448 if (load_result == NULL) {
3449 char msg[1024];
3450 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3451 // Since 'ebuf' may contain a string encoded using
3452 // platform encoding scheme, we need to pass
3453 // Exceptions::unsafe_to_utf8 to the new_exception method
3454 // as the last argument. See bug 6367357.
3455 Handle h_exception =
3456 Exceptions::new_exception(thread,
3457 vmSymbols::java_lang_UnsatisfiedLinkError(),
3458 msg, Exceptions::unsafe_to_utf8);
3459
3460 THROW_HANDLE_0(h_exception);
3461 }
3462 return load_result;
3463 JVM_END
3464
3465
3466 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3467 JVMWrapper("JVM_UnloadLibrary");
3468 os::dll_unload(handle);
3469 JVM_END
3470
3471
3472 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3473 JVMWrapper("JVM_FindLibraryEntry");
3474 return os::dll_lookup(handle, name);
3475 JVM_END
3476
3477
3478 // JNI version ///////////////////////////////////////////////////////////////////////////////
3479
3480 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3481 JVMWrapper("JVM_IsSupportedJNIVersion");
3482 return Threads::is_supported_jni_version_including_1_1(version);
3483 JVM_END
3484
3485
3486 // String support ///////////////////////////////////////////////////////////////////////////
3487
3488 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3489 JVMWrapper("JVM_InternString");
3490 JvmtiVMObjectAllocEventCollector oam;
3491 if (str == NULL) return NULL;
3492 oop string = JNIHandles::resolve_non_null(str);
3493 oop result = StringTable::intern(string, CHECK_NULL);
3494 return (jstring) JNIHandles::make_local(env, result);
3495 JVM_END
3496
3497
3498 // Raw monitor support //////////////////////////////////////////////////////////////////////
3499
3500 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3501 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3502 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3503 // that only works with java threads.
3504
3505
3506 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3507 VM_Exit::block_if_vm_exited();
3508 JVMWrapper("JVM_RawMonitorCreate");
3509 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3510 }
3511
3512
3513 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3514 VM_Exit::block_if_vm_exited();
3515 JVMWrapper("JVM_RawMonitorDestroy");
3516 delete ((Mutex*) mon);
3517 }
3518
3519
3520 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3521 VM_Exit::block_if_vm_exited();
3522 JVMWrapper("JVM_RawMonitorEnter");
3523 ((Mutex*) mon)->jvm_raw_lock();
3524 return 0;
3525 }
3526
3527
3528 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3529 VM_Exit::block_if_vm_exited();
3530 JVMWrapper("JVM_RawMonitorExit");
3531 ((Mutex*) mon)->jvm_raw_unlock();
3532 }
3533
3534
3535 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3536
3537 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3538 Handle loader, Handle protection_domain,
3539 jboolean throwError, TRAPS) {
3540 // Security Note:
3541 // The Java level wrapper will perform the necessary security check allowing
3542 // us to pass the NULL as the initiating class loader. The VM is responsible for
3543 // the checkPackageAccess relative to the initiating class loader via the
3544 // protection_domain. The protection_domain is passed as NULL by the java code
3545 // if there is no security manager in 3-arg Class.forName().
3546 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3547
3548 // Check if we should initialize the class
3549 if (init && klass->is_instance_klass()) {
3550 klass->initialize(CHECK_NULL);
3551 }
3552 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3553 }
3554
3555
3556 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3557
3558 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3559 JVMWrapper("JVM_InvokeMethod");
3560 Handle method_handle;
3561 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3562 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3563 Handle receiver(THREAD, JNIHandles::resolve(obj));
3564 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3565 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3566 jobject res = JNIHandles::make_local(env, result);
3567 if (JvmtiExport::should_post_vm_object_alloc()) {
3568 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3569 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3570 if (java_lang_Class::is_primitive(ret_type)) {
3571 // Only for primitive type vm allocates memory for java object.
3572 // See box() method.
3573 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3574 }
3575 }
3576 return res;
3577 } else {
3578 THROW_0(vmSymbols::java_lang_StackOverflowError());
3579 }
3580 JVM_END
3581
3582
3583 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3584 JVMWrapper("JVM_NewInstanceFromConstructor");
3585 oop constructor_mirror = JNIHandles::resolve(c);
3586 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3587 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3588 jobject res = JNIHandles::make_local(env, result);
3589 if (JvmtiExport::should_post_vm_object_alloc()) {
3590 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3591 }
3592 return res;
3593 JVM_END
3594
3595 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3596
3597 JVM_LEAF(jboolean, JVM_SupportsCX8())
3598 JVMWrapper("JVM_SupportsCX8");
3599 return VM_Version::supports_cx8();
3600 JVM_END
3601
3602 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3603 JVMWrapper("JVM_InitializeFromArchive");
3604 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3605 assert(k->is_klass(), "just checking");
3606 HeapShared::initialize_from_archived_subgraph(k);
3607 JVM_END
3608
3609 // Returns an array of all live Thread objects (VM internal JavaThreads,
3610 // jvmti agent threads, and JNI attaching threads are skipped)
3611 // See CR 6404306 regarding JNI attaching threads
3612 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3613 ResourceMark rm(THREAD);
3614 ThreadsListEnumerator tle(THREAD, false, false);
3615 JvmtiVMObjectAllocEventCollector oam;
3616
3617 int num_threads = tle.num_threads();
3618 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3619 objArrayHandle threads_ah(THREAD, r);
3620
3621 for (int i = 0; i < num_threads; i++) {
3622 Handle h = tle.get_threadObj(i);
3623 threads_ah->obj_at_put(i, h());
3624 }
3625
3626 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3627 JVM_END
3628
3629
3630 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3631 // Return StackTraceElement[][], each element is the stack trace of a thread in
3632 // the corresponding entry in the given threads array
3633 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3634 JVMWrapper("JVM_DumpThreads");
3635 JvmtiVMObjectAllocEventCollector oam;
3636
3637 // Check if threads is null
3638 if (threads == NULL) {
3639 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3640 }
3641
3642 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3643 objArrayHandle ah(THREAD, a);
3644 int num_threads = ah->length();
3645 // check if threads is non-empty array
3646 if (num_threads == 0) {
3647 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3648 }
3649
3650 // check if threads is not an array of objects of Thread class
3651 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3652 if (k != SystemDictionary::Thread_klass()) {
3653 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3654 }
3655
3656 ResourceMark rm(THREAD);
3657
3658 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3659 for (int i = 0; i < num_threads; i++) {
3660 oop thread_obj = ah->obj_at(i);
3661 instanceHandle h(THREAD, (instanceOop) thread_obj);
3662 thread_handle_array->append(h);
3663 }
3664
3665 // The JavaThread references in thread_handle_array are validated
3666 // in VM_ThreadDump::doit().
3667 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3668 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3669
3670 JVM_END
3671
3672 // JVM monitoring and management support
3673 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3674 return Management::get_jmm_interface(version);
3675 JVM_END
3676
3677 // com.sun.tools.attach.VirtualMachine agent properties support
3678 //
3679 // Initialize the agent properties with the properties maintained in the VM
3680 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3681 JVMWrapper("JVM_InitAgentProperties");
3682 ResourceMark rm;
3683
3684 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3685
3686 PUTPROP(props, "sun.java.command", Arguments::java_command());
3687 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3688 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3689 return properties;
3690 JVM_END
3691
3692 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3693 {
3694 JVMWrapper("JVM_GetEnclosingMethodInfo");
3695 JvmtiVMObjectAllocEventCollector oam;
3696
3697 if (ofClass == NULL) {
3698 return NULL;
3699 }
3700 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3701 // Special handling for primitive objects
3702 if (java_lang_Class::is_primitive(mirror())) {
3703 return NULL;
3704 }
3705 Klass* k = java_lang_Class::as_Klass(mirror());
3706 if (!k->is_instance_klass()) {
3707 return NULL;
3708 }
3709 InstanceKlass* ik = InstanceKlass::cast(k);
3710 int encl_method_class_idx = ik->enclosing_method_class_index();
3711 if (encl_method_class_idx == 0) {
3712 return NULL;
3713 }
3714 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3715 objArrayHandle dest(THREAD, dest_o);
3716 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3717 dest->obj_at_put(0, enc_k->java_mirror());
3718 int encl_method_method_idx = ik->enclosing_method_method_index();
3719 if (encl_method_method_idx != 0) {
3720 Symbol* sym = ik->constants()->symbol_at(
3721 extract_low_short_from_int(
3722 ik->constants()->name_and_type_at(encl_method_method_idx)));
3723 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3724 dest->obj_at_put(1, str());
3725 sym = ik->constants()->symbol_at(
3726 extract_high_short_from_int(
3727 ik->constants()->name_and_type_at(encl_method_method_idx)));
3728 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3729 dest->obj_at_put(2, str());
3730 }
3731 return (jobjectArray) JNIHandles::make_local(dest());
3732 }
3733 JVM_END
3734
3735 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3736 {
3737 memset(info, 0, info_size);
3738
3739 info->jvm_version = VM_Version::jvm_version();
3740 info->patch_version = VM_Version::vm_patch_version();
3741
3742 // when we add a new capability in the jvm_version_info struct, we should also
3743 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3744 // counter defined in runtimeService.cpp.
3745 info->is_attach_supported = AttachListener::is_attach_supported();
3746 }
3747 JVM_END
3748
3749 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3750 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3751 ResourceMark rm(THREAD);
3752
3753 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3754 return NULL;
3755 }
3756
3757 char** vm_flags = Arguments::jvm_flags_array();
3758 char** vm_args = Arguments::jvm_args_array();
3759 int num_flags = Arguments::num_jvm_flags();
3760 int num_args = Arguments::num_jvm_args();
3761
3762 InstanceKlass* ik = SystemDictionary::String_klass();
3763 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3764 objArrayHandle result_h(THREAD, r);
3765
3766 int index = 0;
3767 for (int j = 0; j < num_flags; j++, index++) {
3768 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3769 result_h->obj_at_put(index, h());
3770 }
3771 for (int i = 0; i < num_args; i++, index++) {
3772 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3773 result_h->obj_at_put(index, h());
3774 }
3775 return (jobjectArray) JNIHandles::make_local(env, result_h());
3776 JVM_END
3777
3778 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3779 return os::get_signal_number(name);
3780 JVM_END