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 enum {
945 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
946 NONFINDABLE_CLASS = java_lang_invoke_MemberName::MN_NONFINDABLE_CLASS,
947 WEAK_CLASS = java_lang_invoke_MemberName::MN_WEAK_CLASS,
948 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
949 };
950
951 /*
952 * Define a class with the specified flags that indicates if it's a nestmate,
953 * not findable, or weakly reachable from class loader.
954 *
955 * Same class may be defined by multiple threads at the same time.
956 * Should the VM keep the classData (the one successfully defined the class)
957 * as if a private static field is declared in the class?
958 */
959 static jclass jvm_lookup_define_class(JNIEnv *env, jclass lookup, const char *name,
960 jobject loader, const jbyte *buf, jsize len, jobject pd,
961 int flags, jobject classData, TRAPS) {
962 assert(THREAD->is_Java_thread(), "must be a JavaThread");
963 JavaThread* jt = (JavaThread*) THREAD;
964 ResourceMark rm(THREAD);
965
966 const Klass* lookup_class = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
967 jboolean is_nestmate = (flags & NESTMATE) == NESTMATE;
968 jboolean is_nonfindable = (flags & NONFINDABLE_CLASS) == NONFINDABLE_CLASS;
969 jboolean is_weak = (flags & WEAK_CLASS) == WEAK_CLASS;
970 jboolean vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
971
972 // Lookup class must be a non-null instance
973 if (lookup_class == NULL) {
974 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
975 }
976 assert(lookup_class->is_instance_klass(), "Lookup class must be an instance klass");
977
978 // classData (constant pool patching replacement) is only applicable for nonfindable classes
979 if (classData != NULL && !is_nonfindable) {
980 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for nonfindable classes");
981 }
982
983 // vm_annotations only allowed for nonfindable classes
984 if (vm_annotations && !is_nonfindable) {
985 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for weak nonfindable classes");
986 }
987
988 if (log_is_enabled(Info, class, nestmates)) {
989 log_info(class, nestmates)("Lookup define class %s is_nestmate %d is_nonfindable %d is_weak %d vm annotations %d name %s",
990 lookup_class->external_name(), is_nestmate, is_nonfindable, is_weak, vm_annotations, name);
991 }
992
993 // Since exceptions can be thrown, class initialization can take place
994 // if name is NULL no check for class name in .class stream has to be made.
995 TempNewSymbol class_name = NULL;
996 if (name != NULL) {
997 const int str_len = (int)strlen(name);
998 if (str_len > Symbol::max_length()) {
999 // It's impossible to create this class; the name cannot fit
1000 // into the constant pool.
1001 Exceptions::fthrow(THREAD_AND_LOCATION,
1002 vmSymbols::java_lang_NoClassDefFoundError(),
1003 "Class name exceeds maximum length of %d: %s",
1004 Symbol::max_length(),
1005 name);
1006 return 0;
1007 }
1008 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
1009 }
1010
1011 Klass* k;
1012 const InstanceKlass* nest_host = InstanceKlass::cast(lookup_class);
1013 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1014 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1015 const char* source = is_nestmate ? nest_host->external_name() : "__JVM_LookupDefineClass__";
1016 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1017
1018 if (!is_nonfindable) {
1019 k = SystemDictionary::resolve_from_stream(class_name,
1020 class_loader,
1021 protection_domain,
1022 &st,
1023 CHECK_NULL);
1024
1025 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
1026 trace_class_resolution(k);
1027 }
1028 } else { //nonfindable
1029 k = SystemDictionary::parse_stream(class_name,
1030 class_loader,
1031 protection_domain,
1032 &st,
1033 NULL, // unsafe_anonymous_host
1034 NULL, // cp_patches
1035 is_nonfindable,
1036 is_weak,
1037 vm_annotations,
1038 CHECK_NULL);
1039 if (k == NULL) {
1040 THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a nonfindable class");
1041 }
1042
1043 // The nonfindable class loader data has been artificially been kept alive to
1044 // this point. The mirror and any instances of this class have to keep
1045 // it alive afterwards.
1046 InstanceKlass::cast(k)->class_loader_data()->dec_keep_alive();
1047 }
1048
1049 // set nest host
1050 if (is_nestmate) {
1051 InstanceKlass* ik = InstanceKlass::cast(k);
1052 ik->set_nest_host((InstanceKlass*)nest_host);
1053 if (log_is_enabled(Debug, class, nestmates)) {
1054 ModuleEntry* module = ik->module();
1055 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1056 log_debug(class, nestmates)("Dynamic nestmate: %s/%s nest_host %s is_nonfindable %s",
1057 module_name, ik->external_name(), nest_host->external_name(),
1058 ik->is_nonfindable() ? "true" : "false");
1059 }
1060 }
1061
1062 return (jclass) JNIHandles::make_local(env, k->java_mirror());
1063 }
1064
1065 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1066 JVMWrapper("JVM_DefineClass");
1067
1068 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
1069 JVM_END
1070
1071 /*
1072 * Define a class with the specified lookup class.
1073 * lookup: Lookup class
1074 * name: the name of the class
1075 * loader: defining class loader
1076 * buf: class bytes
1077 * len: length of class bytes
1078 * pd: protection domain
1079 * flags: properties of the class
1080 * classData: private static pre-initialized field
1081 */
1082 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, jobject loader,
1083 const jbyte *buf, jsize len, jobject pd, int flags, jobject classData))
1084 JVMWrapper("JVM_LookupDefineClass");
1085
1086 if (lookup == NULL) {
1087 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1088 }
1089
1090 assert(buf != NULL, "buf must not be NULL");
1091
1092 return jvm_lookup_define_class(env, lookup, name, loader, buf, len, pd, flags, classData, THREAD);
1093 JVM_END
1094
1095 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1096 JVMWrapper("JVM_DefineClassWithSource");
1097
1098 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
1099 JVM_END
1100
1101 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1102 JVMWrapper("JVM_FindLoadedClass");
1103 ResourceMark rm(THREAD);
1104
1105 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1106 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
1107
1108 const char* str = java_lang_String::as_utf8_string(string());
1109 // Sanity check, don't expect null
1110 if (str == NULL) return NULL;
1111
1112 const int str_len = (int)strlen(str);
1113 if (str_len > Symbol::max_length()) {
1114 // It's impossible to create this class; the name cannot fit
1115 // into the constant pool.
1116 return NULL;
1117 }
1118 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
1119
1120 // Security Note:
1121 // The Java level wrapper will perform the necessary security check allowing
1122 // us to pass the NULL as the initiating class loader.
1123 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1124 if (UsePerfData) {
1125 is_lock_held_by_thread(h_loader,
1126 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1127 THREAD);
1128 }
1129
1130 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1131 h_loader,
1132 Handle(),
1133 CHECK_NULL);
1134 #if INCLUDE_CDS
1135 if (k == NULL) {
1136 // If the class is not already loaded, try to see if it's in the shared
1137 // archive for the current classloader (h_loader).
1138 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1139 }
1140 #endif
1141 return (k == NULL) ? NULL :
1142 (jclass) JNIHandles::make_local(env, k->java_mirror());
1143 JVM_END
1144
1145 // Module support //////////////////////////////////////////////////////////////////////////////
1146
1147 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1148 jstring location, const char* const* packages, jsize num_packages))
1149 JVMWrapper("JVM_DefineModule");
1150 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1151 JVM_END
1152
1153 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1154 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1155 Modules::set_bootloader_unnamed_module(module, CHECK);
1156 JVM_END
1157
1158 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1159 JVMWrapper("JVM_AddModuleExports");
1160 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1161 JVM_END
1162
1163 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1164 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1165 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1166 JVM_END
1167
1168 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1169 JVMWrapper("JVM_AddModuleExportsToAll");
1170 Modules::add_module_exports(from_module, package, NULL, CHECK);
1171 JVM_END
1172
1173 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1174 JVMWrapper("JVM_AddReadsModule");
1175 Modules::add_reads_module(from_module, source_module, CHECK);
1176 JVM_END
1177
1178 // Reflection support //////////////////////////////////////////////////////////////////////////////
1179
1180 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1181 assert (cls != NULL, "illegal class");
1182 JVMWrapper("JVM_GetClassName");
1183 JvmtiVMObjectAllocEventCollector oam;
1184 ResourceMark rm(THREAD);
1185 const char* name;
1186 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1187 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1188 } else {
1189 // Consider caching interned string in Klass
1190 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1191 assert(k->is_klass(), "just checking");
1192 name = k->external_name();
1193 }
1194 oop result = StringTable::intern((char*) name, CHECK_NULL);
1195 return (jstring) JNIHandles::make_local(env, result);
1196 JVM_END
1197
1198
1199 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1200 JVMWrapper("JVM_GetClassInterfaces");
1201 JvmtiVMObjectAllocEventCollector oam;
1202 oop mirror = JNIHandles::resolve_non_null(cls);
1203
1204 // Special handling for primitive objects
1205 if (java_lang_Class::is_primitive(mirror)) {
1206 // Primitive objects does not have any interfaces
1207 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1208 return (jobjectArray) JNIHandles::make_local(env, r);
1209 }
1210
1211 Klass* klass = java_lang_Class::as_Klass(mirror);
1212 // Figure size of result array
1213 int size;
1214 if (klass->is_instance_klass()) {
1215 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1216 } else {
1217 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1218 size = 2;
1219 }
1220
1221 // Allocate result array
1222 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1223 objArrayHandle result (THREAD, r);
1224 // Fill in result
1225 if (klass->is_instance_klass()) {
1226 // Regular instance klass, fill in all local interfaces
1227 for (int index = 0; index < size; index++) {
1228 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1229 result->obj_at_put(index, k->java_mirror());
1230 }
1231 } else {
1232 // All arrays implement java.lang.Cloneable and java.io.Serializable
1233 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1234 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1235 }
1236 return (jobjectArray) JNIHandles::make_local(env, result());
1237 JVM_END
1238
1239
1240 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1241 JVMWrapper("JVM_IsInterface");
1242 oop mirror = JNIHandles::resolve_non_null(cls);
1243 if (java_lang_Class::is_primitive(mirror)) {
1244 return JNI_FALSE;
1245 }
1246 Klass* k = java_lang_Class::as_Klass(mirror);
1247 jboolean result = k->is_interface();
1248 assert(!result || k->is_instance_klass(),
1249 "all interfaces are instance types");
1250 // The compiler intrinsic for isInterface tests the
1251 // Klass::_access_flags bits in the same way.
1252 return result;
1253 JVM_END
1254
1255
1256 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1257 JVMWrapper("JVM_GetClassSigners");
1258 JvmtiVMObjectAllocEventCollector oam;
1259 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1260 // There are no signers for primitive types
1261 return NULL;
1262 }
1263
1264 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1265
1266 // If there are no signers set in the class, or if the class
1267 // is an array, return NULL.
1268 if (signers == NULL) return NULL;
1269
1270 // copy of the signers array
1271 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1272 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1273 for (int index = 0; index < signers->length(); index++) {
1274 signers_copy->obj_at_put(index, signers->obj_at(index));
1275 }
1276
1277 // return the copy
1278 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1279 JVM_END
1280
1281
1282 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1283 JVMWrapper("JVM_SetClassSigners");
1284 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1285 // This call is ignored for primitive types and arrays.
1286 // Signers are only set once, ClassLoader.java, and thus shouldn't
1287 // be called with an array. Only the bootstrap loader creates arrays.
1288 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1289 if (k->is_instance_klass()) {
1290 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1291 }
1292 }
1293 JVM_END
1294
1295
1296 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1297 JVMWrapper("JVM_GetProtectionDomain");
1298 if (JNIHandles::resolve(cls) == NULL) {
1299 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1300 }
1301
1302 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1303 // Primitive types does not have a protection domain.
1304 return NULL;
1305 }
1306
1307 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1308 return (jobject) JNIHandles::make_local(env, pd);
1309 JVM_END
1310
1311
1312 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) {
1313 // If there is a security manager and protection domain, check the access
1314 // in the protection domain, otherwise it is authorized.
1315 if (java_lang_System::has_security_manager()) {
1316
1317 // For bootstrapping, if pd implies method isn't in the JDK, allow
1318 // this context to revert to older behavior.
1319 // In this case the isAuthorized field in AccessControlContext is also not
1320 // present.
1321 if (Universe::protection_domain_implies_method() == NULL) {
1322 return true;
1323 }
1324
1325 // Whitelist certain access control contexts
1326 if (java_security_AccessControlContext::is_authorized(context)) {
1327 return true;
1328 }
1329
1330 oop prot = klass->protection_domain();
1331 if (prot != NULL) {
1332 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1333 // in the new wrapper.
1334 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1335 Handle h_prot(THREAD, prot);
1336 JavaValue result(T_BOOLEAN);
1337 JavaCallArguments args(h_prot);
1338 JavaCalls::call(&result, m, &args, CHECK_false);
1339 return (result.get_jboolean() != 0);
1340 }
1341 }
1342 return true;
1343 }
1344
1345 // Create an AccessControlContext with a protection domain with null codesource
1346 // and null permissions - which gives no permissions.
1347 oop create_dummy_access_control_context(TRAPS) {
1348 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1349 // Call constructor ProtectionDomain(null, null);
1350 Handle obj = JavaCalls::construct_new_instance(pd_klass,
1351 vmSymbols::codesource_permissioncollection_signature(),
1352 Handle(), Handle(), CHECK_NULL);
1353
1354 // new ProtectionDomain[] {pd};
1355 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1356 context->obj_at_put(0, obj());
1357
1358 // new AccessControlContext(new ProtectionDomain[] {pd})
1359 objArrayHandle h_context(THREAD, context);
1360 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1361 return acc;
1362 }
1363
1364 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1365 JVMWrapper("JVM_DoPrivileged");
1366
1367 if (action == NULL) {
1368 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1369 }
1370
1371 // Compute the frame initiating the do privileged operation and setup the privileged stack
1372 vframeStream vfst(thread);
1373 vfst.security_get_caller_frame(1);
1374
1375 if (vfst.at_end()) {
1376 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1377 }
1378
1379 Method* method = vfst.method();
1380 InstanceKlass* klass = method->method_holder();
1381
1382 // Check that action object understands "Object run()"
1383 Handle h_context;
1384 if (context != NULL) {
1385 h_context = Handle(THREAD, JNIHandles::resolve(context));
1386 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1387 if (!authorized) {
1388 // Create an unprivileged access control object and call it's run function
1389 // instead.
1390 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1391 h_context = Handle(THREAD, noprivs);
1392 }
1393 }
1394
1395 // Check that action object understands "Object run()"
1396 Handle object (THREAD, JNIHandles::resolve(action));
1397
1398 // get run() method
1399 Method* m_oop = object->klass()->uncached_lookup_method(
1400 vmSymbols::run_method_name(),
1401 vmSymbols::void_object_signature(),
1402 Klass::find_overpass);
1403
1404 // See if there is a default method for "Object run()".
1405 if (m_oop == NULL && object->klass()->is_instance_klass()) {
1406 InstanceKlass* iklass = InstanceKlass::cast(object->klass());
1407 m_oop = iklass->lookup_method_in_ordered_interfaces(
1408 vmSymbols::run_method_name(),
1409 vmSymbols::void_object_signature());
1410 }
1411
1412 methodHandle m (THREAD, m_oop);
1413 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) {
1414 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1415 }
1416
1417 // Stack allocated list of privileged stack elements
1418 PrivilegedElement pi;
1419 if (!vfst.at_end()) {
1420 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1421 thread->set_privileged_stack_top(&pi);
1422 }
1423
1424
1425 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1426 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1427 Handle pending_exception;
1428 JavaValue result(T_OBJECT);
1429 JavaCallArguments args(object);
1430 JavaCalls::call(&result, m, &args, THREAD);
1431
1432 // done with action, remove ourselves from the list
1433 if (!vfst.at_end()) {
1434 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1435 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1436 }
1437
1438 if (HAS_PENDING_EXCEPTION) {
1439 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1440 CLEAR_PENDING_EXCEPTION;
1441 // JVMTI has already reported the pending exception
1442 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1443 if (THREAD->is_Java_thread()) {
1444 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1445 }
1446 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1447 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1448 // Throw a java.security.PrivilegedActionException(Exception e) exception
1449 JavaCallArguments args(pending_exception);
1450 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1451 vmSymbols::exception_void_signature(),
1452 &args);
1453 }
1454 }
1455
1456 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1457 return JNIHandles::make_local(env, (oop) result.get_jobject());
1458 JVM_END
1459
1460
1461 // Returns the inherited_access_control_context field of the running thread.
1462 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1463 JVMWrapper("JVM_GetInheritedAccessControlContext");
1464 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1465 return JNIHandles::make_local(env, result);
1466 JVM_END
1467
1468 class RegisterArrayForGC {
1469 private:
1470 JavaThread *_thread;
1471 public:
1472 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1473 _thread = thread;
1474 _thread->register_array_for_gc(array);
1475 }
1476
1477 ~RegisterArrayForGC() {
1478 _thread->register_array_for_gc(NULL);
1479 }
1480 };
1481
1482
1483 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1484 JVMWrapper("JVM_GetStackAccessControlContext");
1485 if (!UsePrivilegedStack) return NULL;
1486
1487 ResourceMark rm(THREAD);
1488 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1489 JvmtiVMObjectAllocEventCollector oam;
1490
1491 // count the protection domains on the execution stack. We collapse
1492 // duplicate consecutive protection domains into a single one, as
1493 // well as stopping when we hit a privileged frame.
1494
1495 // Use vframeStream to iterate through Java frames
1496 vframeStream vfst(thread);
1497
1498 oop previous_protection_domain = NULL;
1499 Handle privileged_context(thread, NULL);
1500 bool is_privileged = false;
1501 oop protection_domain = NULL;
1502
1503 for(; !vfst.at_end(); vfst.next()) {
1504 // get method of frame
1505 Method* method = vfst.method();
1506 intptr_t* frame_id = vfst.frame_id();
1507
1508 // check the privileged frames to see if we have a match
1509 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1510 // this frame is privileged
1511 is_privileged = true;
1512 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1513 protection_domain = thread->privileged_stack_top()->protection_domain();
1514 } else {
1515 protection_domain = method->method_holder()->protection_domain();
1516 }
1517
1518 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) {
1519 local_array->push(protection_domain);
1520 previous_protection_domain = protection_domain;
1521 }
1522
1523 if (is_privileged) break;
1524 }
1525
1526
1527 // either all the domains on the stack were system domains, or
1528 // we had a privileged system domain
1529 if (local_array->is_empty()) {
1530 if (is_privileged && privileged_context.is_null()) return NULL;
1531
1532 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1533 return JNIHandles::make_local(env, result);
1534 }
1535
1536 // the resource area must be registered in case of a gc
1537 RegisterArrayForGC ragc(thread, local_array);
1538 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1539 local_array->length(), CHECK_NULL);
1540 objArrayHandle h_context(thread, context);
1541 for (int index = 0; index < local_array->length(); index++) {
1542 h_context->obj_at_put(index, local_array->at(index));
1543 }
1544
1545 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1546
1547 return JNIHandles::make_local(env, result);
1548 JVM_END
1549
1550
1551 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1552 JVMWrapper("JVM_IsArrayClass");
1553 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1554 return (k != NULL) && k->is_array_klass() ? true : false;
1555 JVM_END
1556
1557
1558 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1559 JVMWrapper("JVM_IsPrimitiveClass");
1560 oop mirror = JNIHandles::resolve_non_null(cls);
1561 return (jboolean) java_lang_Class::is_primitive(mirror);
1562 JVM_END
1563
1564
1565 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1566 JVMWrapper("JVM_GetClassModifiers");
1567 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1568 // Primitive type
1569 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1570 }
1571
1572 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1573 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1574 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1575 return k->modifier_flags();
1576 JVM_END
1577
1578
1579 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1580
1581 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1582 JvmtiVMObjectAllocEventCollector oam;
1583 // ofClass is a reference to a java_lang_Class object. The mirror object
1584 // of an InstanceKlass
1585
1586 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1587 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1588 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1589 return (jobjectArray)JNIHandles::make_local(env, result);
1590 }
1591
1592 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1593 InnerClassesIterator iter(k);
1594
1595 if (iter.length() == 0) {
1596 // Neither an inner nor outer class
1597 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1598 return (jobjectArray)JNIHandles::make_local(env, result);
1599 }
1600
1601 // find inner class info
1602 constantPoolHandle cp(thread, k->constants());
1603 int length = iter.length();
1604
1605 // Allocate temp. result array
1606 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1607 objArrayHandle result (THREAD, r);
1608 int members = 0;
1609
1610 for (; !iter.done(); iter.next()) {
1611 int ioff = iter.inner_class_info_index();
1612 int ooff = iter.outer_class_info_index();
1613
1614 if (ioff != 0 && ooff != 0) {
1615 // Check to see if the name matches the class we're looking for
1616 // before attempting to find the class.
1617 if (cp->klass_name_at_matches(k, ooff)) {
1618 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1619 if (outer_klass == k) {
1620 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1621 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1622
1623 // Throws an exception if outer klass has not declared k as
1624 // an inner klass
1625 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1626
1627 result->obj_at_put(members, inner_klass->java_mirror());
1628 members++;
1629 }
1630 }
1631 }
1632 }
1633
1634 if (members != length) {
1635 // Return array of right length
1636 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1637 for(int i = 0; i < members; i++) {
1638 res->obj_at_put(i, result->obj_at(i));
1639 }
1640 return (jobjectArray)JNIHandles::make_local(env, res);
1641 }
1642
1643 return (jobjectArray)JNIHandles::make_local(env, result());
1644 JVM_END
1645
1646
1647 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1648 {
1649 // ofClass is a reference to a java_lang_Class object.
1650 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1651 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1652 return NULL;
1653 }
1654
1655 bool inner_is_member = false;
1656 Klass* outer_klass
1657 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1658 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1659 if (outer_klass == NULL) return NULL; // already a top-level class
1660 if (!inner_is_member) return NULL; // a nonfindable or unsafe anonymous class (inside a method)
1661 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1662 }
1663 JVM_END
1664
1665 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1666 {
1667 oop mirror = JNIHandles::resolve_non_null(cls);
1668 if (java_lang_Class::is_primitive(mirror) ||
1669 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1670 return NULL;
1671 }
1672 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1673 int ooff = 0, noff = 0;
1674 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1675 if (noff != 0) {
1676 constantPoolHandle i_cp(thread, k->constants());
1677 Symbol* name = i_cp->symbol_at(noff);
1678 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1679 return (jstring) JNIHandles::make_local(env, str());
1680 }
1681 }
1682 return NULL;
1683 }
1684 JVM_END
1685
1686 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1687 assert (cls != NULL, "illegal class");
1688 JVMWrapper("JVM_GetClassSignature");
1689 JvmtiVMObjectAllocEventCollector oam;
1690 ResourceMark rm(THREAD);
1691 // Return null for arrays and primatives
1692 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1693 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1694 if (k->is_instance_klass()) {
1695 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1696 if (sym == NULL) return NULL;
1697 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1698 return (jstring) JNIHandles::make_local(env, str());
1699 }
1700 }
1701 return NULL;
1702 JVM_END
1703
1704
1705 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1706 assert (cls != NULL, "illegal class");
1707 JVMWrapper("JVM_GetClassAnnotations");
1708
1709 // Return null for arrays and primitives
1710 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1711 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1712 if (k->is_instance_klass()) {
1713 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1714 return (jbyteArray) JNIHandles::make_local(env, a);
1715 }
1716 }
1717 return NULL;
1718 JVM_END
1719
1720
1721 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1722 // some of this code was adapted from from jni_FromReflectedField
1723
1724 oop reflected = JNIHandles::resolve_non_null(field);
1725 oop mirror = java_lang_reflect_Field::clazz(reflected);
1726 Klass* k = java_lang_Class::as_Klass(mirror);
1727 int slot = java_lang_reflect_Field::slot(reflected);
1728 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1729
1730 InstanceKlass* ik = InstanceKlass::cast(k);
1731 intptr_t offset = ik->field_offset(slot);
1732
1733 if (modifiers & JVM_ACC_STATIC) {
1734 // for static fields we only look in the current class
1735 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1736 assert(false, "cannot find static field");
1737 return false;
1738 }
1739 } else {
1740 // for instance fields we start with the current class and work
1741 // our way up through the superclass chain
1742 if (!ik->find_field_from_offset(offset, false, &fd)) {
1743 assert(false, "cannot find instance field");
1744 return false;
1745 }
1746 }
1747 return true;
1748 }
1749
1750 static Method* jvm_get_method_common(jobject method) {
1751 // some of this code was adapted from from jni_FromReflectedMethod
1752
1753 oop reflected = JNIHandles::resolve_non_null(method);
1754 oop mirror = NULL;
1755 int slot = 0;
1756
1757 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1758 mirror = java_lang_reflect_Constructor::clazz(reflected);
1759 slot = java_lang_reflect_Constructor::slot(reflected);
1760 } else {
1761 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1762 "wrong type");
1763 mirror = java_lang_reflect_Method::clazz(reflected);
1764 slot = java_lang_reflect_Method::slot(reflected);
1765 }
1766 Klass* k = java_lang_Class::as_Klass(mirror);
1767
1768 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1769 assert(m != NULL, "cannot find method");
1770 return m; // caller has to deal with NULL in product mode
1771 }
1772
1773 /* Type use annotations support (JDK 1.8) */
1774
1775 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1776 assert (cls != NULL, "illegal class");
1777 JVMWrapper("JVM_GetClassTypeAnnotations");
1778 ResourceMark rm(THREAD);
1779 // Return null for arrays and primitives
1780 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1781 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1782 if (k->is_instance_klass()) {
1783 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1784 if (type_annotations != NULL) {
1785 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1786 return (jbyteArray) JNIHandles::make_local(env, a);
1787 }
1788 }
1789 }
1790 return NULL;
1791 JVM_END
1792
1793 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1794 assert (method != NULL, "illegal method");
1795 JVMWrapper("JVM_GetMethodTypeAnnotations");
1796
1797 // method is a handle to a java.lang.reflect.Method object
1798 Method* m = jvm_get_method_common(method);
1799 if (m == NULL) {
1800 return NULL;
1801 }
1802
1803 AnnotationArray* type_annotations = m->type_annotations();
1804 if (type_annotations != NULL) {
1805 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1806 return (jbyteArray) JNIHandles::make_local(env, a);
1807 }
1808
1809 return NULL;
1810 JVM_END
1811
1812 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1813 assert (field != NULL, "illegal field");
1814 JVMWrapper("JVM_GetFieldTypeAnnotations");
1815
1816 fieldDescriptor fd;
1817 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1818 if (!gotFd) {
1819 return NULL;
1820 }
1821
1822 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1823 JVM_END
1824
1825 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1826 if (!cp->is_within_bounds(index)) {
1827 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1828 }
1829 }
1830
1831 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1832 {
1833 JVMWrapper("JVM_GetMethodParameters");
1834 // method is a handle to a java.lang.reflect.Method object
1835 Method* method_ptr = jvm_get_method_common(method);
1836 methodHandle mh (THREAD, method_ptr);
1837 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1838 const int num_params = mh->method_parameters_length();
1839
1840 if (num_params < 0) {
1841 // A -1 return value from method_parameters_length means there is no
1842 // parameter data. Return null to indicate this to the reflection
1843 // API.
1844 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1845 return (jobjectArray)NULL;
1846 } else {
1847 // Otherwise, we return something up to reflection, even if it is
1848 // a zero-length array. Why? Because in some cases this can
1849 // trigger a MalformedParametersException.
1850
1851 // make sure all the symbols are properly formatted
1852 for (int i = 0; i < num_params; i++) {
1853 MethodParametersElement* params = mh->method_parameters_start();
1854 int index = params[i].name_cp_index;
1855 bounds_check(mh->constants(), index, CHECK_NULL);
1856
1857 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1858 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1859 "Wrong type at constant pool index");
1860 }
1861
1862 }
1863
1864 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1865 objArrayHandle result (THREAD, result_oop);
1866
1867 for (int i = 0; i < num_params; i++) {
1868 MethodParametersElement* params = mh->method_parameters_start();
1869 // For a 0 index, give a NULL symbol
1870 Symbol* sym = 0 != params[i].name_cp_index ?
1871 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1872 int flags = params[i].flags;
1873 oop param = Reflection::new_parameter(reflected_method, i, sym,
1874 flags, CHECK_NULL);
1875 result->obj_at_put(i, param);
1876 }
1877 return (jobjectArray)JNIHandles::make_local(env, result());
1878 }
1879 }
1880 JVM_END
1881
1882 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1883
1884 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1885 {
1886 JVMWrapper("JVM_GetClassDeclaredFields");
1887 JvmtiVMObjectAllocEventCollector oam;
1888
1889 // Exclude primitive types and array types
1890 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1891 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1892 // Return empty array
1893 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1894 return (jobjectArray) JNIHandles::make_local(env, res);
1895 }
1896
1897 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1898 constantPoolHandle cp(THREAD, k->constants());
1899
1900 // Ensure class is linked
1901 k->link_class(CHECK_NULL);
1902
1903 // Allocate result
1904 int num_fields;
1905
1906 if (publicOnly) {
1907 num_fields = 0;
1908 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1909 if (fs.access_flags().is_public()) ++num_fields;
1910 }
1911 } else {
1912 num_fields = k->java_fields_count();
1913 }
1914
1915 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1916 objArrayHandle result (THREAD, r);
1917
1918 int out_idx = 0;
1919 fieldDescriptor fd;
1920 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1921 if (!publicOnly || fs.access_flags().is_public()) {
1922 fd.reinitialize(k, fs.index());
1923 oop field = Reflection::new_field(&fd, CHECK_NULL);
1924 result->obj_at_put(out_idx, field);
1925 ++out_idx;
1926 }
1927 }
1928 assert(out_idx == num_fields, "just checking");
1929 return (jobjectArray) JNIHandles::make_local(env, result());
1930 }
1931 JVM_END
1932
1933 static bool select_method(const methodHandle& method, bool want_constructor) {
1934 if (want_constructor) {
1935 return (method->is_initializer() && !method->is_static());
1936 } else {
1937 return (!method->is_initializer() && !method->is_overpass());
1938 }
1939 }
1940
1941 static jobjectArray get_class_declared_methods_helper(
1942 JNIEnv *env,
1943 jclass ofClass, jboolean publicOnly,
1944 bool want_constructor,
1945 Klass* klass, TRAPS) {
1946
1947 JvmtiVMObjectAllocEventCollector oam;
1948
1949 // Exclude primitive types and array types
1950 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1951 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1952 // Return empty array
1953 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1954 return (jobjectArray) JNIHandles::make_local(env, res);
1955 }
1956
1957 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1958
1959 // Ensure class is linked
1960 k->link_class(CHECK_NULL);
1961
1962 Array<Method*>* methods = k->methods();
1963 int methods_length = methods->length();
1964
1965 // Save original method_idnum in case of redefinition, which can change
1966 // the idnum of obsolete methods. The new method will have the same idnum
1967 // but if we refresh the methods array, the counts will be wrong.
1968 ResourceMark rm(THREAD);
1969 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1970 int num_methods = 0;
1971
1972 for (int i = 0; i < methods_length; i++) {
1973 methodHandle method(THREAD, methods->at(i));
1974 if (select_method(method, want_constructor)) {
1975 if (!publicOnly || method->is_public()) {
1976 idnums->push(method->method_idnum());
1977 ++num_methods;
1978 }
1979 }
1980 }
1981
1982 // Allocate result
1983 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1984 objArrayHandle result (THREAD, r);
1985
1986 // Now just put the methods that we selected above, but go by their idnum
1987 // in case of redefinition. The methods can be redefined at any safepoint,
1988 // so above when allocating the oop array and below when creating reflect
1989 // objects.
1990 for (int i = 0; i < num_methods; i++) {
1991 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1992 if (method.is_null()) {
1993 // Method may have been deleted and seems this API can handle null
1994 // Otherwise should probably put a method that throws NSME
1995 result->obj_at_put(i, NULL);
1996 } else {
1997 oop m;
1998 if (want_constructor) {
1999 m = Reflection::new_constructor(method, CHECK_NULL);
2000 } else {
2001 m = Reflection::new_method(method, false, CHECK_NULL);
2002 }
2003 result->obj_at_put(i, m);
2004 }
2005 }
2006
2007 return (jobjectArray) JNIHandles::make_local(env, result());
2008 }
2009
2010 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2011 {
2012 JVMWrapper("JVM_GetClassDeclaredMethods");
2013 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2014 /*want_constructor*/ false,
2015 SystemDictionary::reflect_Method_klass(), THREAD);
2016 }
2017 JVM_END
2018
2019 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2020 {
2021 JVMWrapper("JVM_GetClassDeclaredConstructors");
2022 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2023 /*want_constructor*/ true,
2024 SystemDictionary::reflect_Constructor_klass(), THREAD);
2025 }
2026 JVM_END
2027
2028 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
2029 {
2030 JVMWrapper("JVM_GetClassAccessFlags");
2031 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2032 // Primitive type
2033 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
2034 }
2035
2036 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2037 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
2038 }
2039 JVM_END
2040
2041 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
2042 {
2043 JVMWrapper("JVM_AreNestMates");
2044 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2045 assert(c->is_instance_klass(), "must be");
2046 InstanceKlass* ck = InstanceKlass::cast(c);
2047 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2048 assert(m->is_instance_klass(), "must be");
2049 InstanceKlass* mk = InstanceKlass::cast(m);
2050 return ck->has_nestmate_access_to(mk, THREAD);
2051 }
2052 JVM_END
2053
2054 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2055 {
2056 // current is not a primitive or array class
2057 JVMWrapper("JVM_GetNestHost");
2058 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2059 assert(c->is_instance_klass(), "must be");
2060 InstanceKlass* ck = InstanceKlass::cast(c);
2061 // Don't post exceptions if validation fails
2062 InstanceKlass* host = ck->nest_host(NULL, THREAD);
2063 return (jclass) (host == NULL ? NULL :
2064 JNIHandles::make_local(THREAD, host->java_mirror()));
2065 }
2066 JVM_END
2067
2068 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2069 {
2070 // current is not a primitive or array class
2071 JVMWrapper("JVM_GetNestMembers");
2072 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2073 assert(c->is_instance_klass(), "must be");
2074 InstanceKlass* ck = InstanceKlass::cast(c);
2075 // Get the nest host for this nest - throw ICCE if validation fails
2076 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
2077 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
2078
2079 {
2080 JvmtiVMObjectAllocEventCollector oam;
2081 Array<u2>* members = host->nest_members();
2082 int length = members == NULL ? 0 : members->length();
2083 // nest host is first in the array so make it one bigger
2084 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2085 length + 1, CHECK_NULL);
2086 objArrayHandle result (THREAD, r);
2087 result->obj_at_put(0, host->java_mirror());
2088 if (length != 0) {
2089 int i;
2090 for (i = 0; i < length; i++) {
2091 int cp_index = members->at(i);
2092 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
2093 if (k->is_instance_klass()) {
2094 InstanceKlass* nest_host_k =
2095 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
2096 if (nest_host_k == host) {
2097 result->obj_at_put(i+1, k->java_mirror());
2098 }
2099 else {
2100 // k's nest host is legal but it isn't our host so
2101 // throw ICCE
2102 ResourceMark rm(THREAD);
2103 Exceptions::fthrow(THREAD_AND_LOCATION,
2104 icce,
2105 "Nest member %s in %s declares a different nest host of %s",
2106 k->external_name(),
2107 host->external_name(),
2108 nest_host_k->external_name()
2109 );
2110 return NULL;
2111 }
2112 }
2113 else {
2114 // we have a bad nest member entry - throw ICCE
2115 ResourceMark rm(THREAD);
2116 Exceptions::fthrow(THREAD_AND_LOCATION,
2117 icce,
2118 "Class %s can not be a nest member of %s",
2119 k->external_name(),
2120 host->external_name()
2121 );
2122 return NULL;
2123 }
2124 }
2125 }
2126 else {
2127 assert(host == ck, "must be singleton nest");
2128 }
2129 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2130 }
2131 }
2132 JVM_END
2133
2134 // Constant pool access //////////////////////////////////////////////////////////
2135
2136 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2137 {
2138 JVMWrapper("JVM_GetClassConstantPool");
2139 JvmtiVMObjectAllocEventCollector oam;
2140
2141 // Return null for primitives and arrays
2142 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2143 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2144 if (k->is_instance_klass()) {
2145 InstanceKlass* k_h = InstanceKlass::cast(k);
2146 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2147 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2148 return JNIHandles::make_local(jcp());
2149 }
2150 }
2151 return NULL;
2152 }
2153 JVM_END
2154
2155
2156 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2157 {
2158 JVMWrapper("JVM_ConstantPoolGetSize");
2159 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2160 return cp->length();
2161 }
2162 JVM_END
2163
2164
2165 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2166 {
2167 JVMWrapper("JVM_ConstantPoolGetClassAt");
2168 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2169 bounds_check(cp, index, CHECK_NULL);
2170 constantTag tag = cp->tag_at(index);
2171 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2172 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2173 }
2174 Klass* k = cp->klass_at(index, CHECK_NULL);
2175 return (jclass) JNIHandles::make_local(k->java_mirror());
2176 }
2177 JVM_END
2178
2179 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2180 {
2181 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2182 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2183 bounds_check(cp, index, CHECK_NULL);
2184 constantTag tag = cp->tag_at(index);
2185 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2186 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2187 }
2188 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2189 if (k == NULL) return NULL;
2190 return (jclass) JNIHandles::make_local(k->java_mirror());
2191 }
2192 JVM_END
2193
2194 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2195 constantTag tag = cp->tag_at(index);
2196 if (!tag.is_method() && !tag.is_interface_method()) {
2197 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2198 }
2199 int klass_ref = cp->uncached_klass_ref_index_at(index);
2200 Klass* k_o;
2201 if (force_resolution) {
2202 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2203 } else {
2204 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2205 if (k_o == NULL) return NULL;
2206 }
2207 InstanceKlass* k = InstanceKlass::cast(k_o);
2208 Symbol* name = cp->uncached_name_ref_at(index);
2209 Symbol* sig = cp->uncached_signature_ref_at(index);
2210 methodHandle m (THREAD, k->find_method(name, sig));
2211 if (m.is_null()) {
2212 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2213 }
2214 oop method;
2215 if (!m->is_initializer() || m->is_static()) {
2216 method = Reflection::new_method(m, true, CHECK_NULL);
2217 } else {
2218 method = Reflection::new_constructor(m, CHECK_NULL);
2219 }
2220 return JNIHandles::make_local(method);
2221 }
2222
2223 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2224 {
2225 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2226 JvmtiVMObjectAllocEventCollector oam;
2227 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2228 bounds_check(cp, index, CHECK_NULL);
2229 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2230 return res;
2231 }
2232 JVM_END
2233
2234 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2235 {
2236 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2237 JvmtiVMObjectAllocEventCollector oam;
2238 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2239 bounds_check(cp, index, CHECK_NULL);
2240 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2241 return res;
2242 }
2243 JVM_END
2244
2245 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2246 constantTag tag = cp->tag_at(index);
2247 if (!tag.is_field()) {
2248 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2249 }
2250 int klass_ref = cp->uncached_klass_ref_index_at(index);
2251 Klass* k_o;
2252 if (force_resolution) {
2253 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2254 } else {
2255 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2256 if (k_o == NULL) return NULL;
2257 }
2258 InstanceKlass* k = InstanceKlass::cast(k_o);
2259 Symbol* name = cp->uncached_name_ref_at(index);
2260 Symbol* sig = cp->uncached_signature_ref_at(index);
2261 fieldDescriptor fd;
2262 Klass* target_klass = k->find_field(name, sig, &fd);
2263 if (target_klass == NULL) {
2264 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2265 }
2266 oop field = Reflection::new_field(&fd, CHECK_NULL);
2267 return JNIHandles::make_local(field);
2268 }
2269
2270 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2271 {
2272 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2273 JvmtiVMObjectAllocEventCollector oam;
2274 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2275 bounds_check(cp, index, CHECK_NULL);
2276 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2277 return res;
2278 }
2279 JVM_END
2280
2281 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2282 {
2283 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2284 JvmtiVMObjectAllocEventCollector oam;
2285 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2286 bounds_check(cp, index, CHECK_NULL);
2287 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2288 return res;
2289 }
2290 JVM_END
2291
2292 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2293 {
2294 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2295 JvmtiVMObjectAllocEventCollector oam;
2296 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2297 bounds_check(cp, index, CHECK_NULL);
2298 constantTag tag = cp->tag_at(index);
2299 if (!tag.is_field_or_method()) {
2300 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2301 }
2302 int klass_ref = cp->uncached_klass_ref_index_at(index);
2303 Symbol* klass_name = cp->klass_name_at(klass_ref);
2304 Symbol* member_name = cp->uncached_name_ref_at(index);
2305 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2306 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2307 objArrayHandle dest(THREAD, dest_o);
2308 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2309 dest->obj_at_put(0, str());
2310 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2311 dest->obj_at_put(1, str());
2312 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2313 dest->obj_at_put(2, str());
2314 return (jobjectArray) JNIHandles::make_local(dest());
2315 }
2316 JVM_END
2317
2318 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2319 {
2320 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2321 JvmtiVMObjectAllocEventCollector oam;
2322 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2323 bounds_check(cp, index, CHECK_0);
2324 constantTag tag = cp->tag_at(index);
2325 if (!tag.is_field_or_method()) {
2326 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2327 }
2328 return (jint) cp->uncached_klass_ref_index_at(index);
2329 }
2330 JVM_END
2331
2332 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2333 {
2334 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2335 JvmtiVMObjectAllocEventCollector oam;
2336 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2337 bounds_check(cp, index, CHECK_0);
2338 constantTag tag = cp->tag_at(index);
2339 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2340 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2341 }
2342 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2343 }
2344 JVM_END
2345
2346 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2347 {
2348 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2349 JvmtiVMObjectAllocEventCollector oam;
2350 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2351 bounds_check(cp, index, CHECK_NULL);
2352 constantTag tag = cp->tag_at(index);
2353 if (!tag.is_name_and_type()) {
2354 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2355 }
2356 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2357 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2358 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2359 objArrayHandle dest(THREAD, dest_o);
2360 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2361 dest->obj_at_put(0, str());
2362 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2363 dest->obj_at_put(1, str());
2364 return (jobjectArray) JNIHandles::make_local(dest());
2365 }
2366 JVM_END
2367
2368 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2369 {
2370 JVMWrapper("JVM_ConstantPoolGetIntAt");
2371 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2372 bounds_check(cp, index, CHECK_0);
2373 constantTag tag = cp->tag_at(index);
2374 if (!tag.is_int()) {
2375 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2376 }
2377 return cp->int_at(index);
2378 }
2379 JVM_END
2380
2381 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2382 {
2383 JVMWrapper("JVM_ConstantPoolGetLongAt");
2384 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2385 bounds_check(cp, index, CHECK_(0L));
2386 constantTag tag = cp->tag_at(index);
2387 if (!tag.is_long()) {
2388 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2389 }
2390 return cp->long_at(index);
2391 }
2392 JVM_END
2393
2394 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2395 {
2396 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2397 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2398 bounds_check(cp, index, CHECK_(0.0f));
2399 constantTag tag = cp->tag_at(index);
2400 if (!tag.is_float()) {
2401 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2402 }
2403 return cp->float_at(index);
2404 }
2405 JVM_END
2406
2407 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2408 {
2409 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2410 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2411 bounds_check(cp, index, CHECK_(0.0));
2412 constantTag tag = cp->tag_at(index);
2413 if (!tag.is_double()) {
2414 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2415 }
2416 return cp->double_at(index);
2417 }
2418 JVM_END
2419
2420 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2421 {
2422 JVMWrapper("JVM_ConstantPoolGetStringAt");
2423 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2424 bounds_check(cp, index, CHECK_NULL);
2425 constantTag tag = cp->tag_at(index);
2426 if (!tag.is_string()) {
2427 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2428 }
2429 oop str = cp->string_at(index, CHECK_NULL);
2430 return (jstring) JNIHandles::make_local(str);
2431 }
2432 JVM_END
2433
2434 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2435 {
2436 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2437 JvmtiVMObjectAllocEventCollector oam;
2438 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2439 bounds_check(cp, index, CHECK_NULL);
2440 constantTag tag = cp->tag_at(index);
2441 if (!tag.is_symbol()) {
2442 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2443 }
2444 Symbol* sym = cp->symbol_at(index);
2445 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2446 return (jstring) JNIHandles::make_local(str());
2447 }
2448 JVM_END
2449
2450 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2451 {
2452 JVMWrapper("JVM_ConstantPoolGetTagAt");
2453 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2454 bounds_check(cp, index, CHECK_0);
2455 constantTag tag = cp->tag_at(index);
2456 jbyte result = tag.value();
2457 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2458 // they are changed to the corresponding tags from the JVM spec, so that java code in
2459 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2460 if (tag.is_klass_or_reference()) {
2461 result = JVM_CONSTANT_Class;
2462 } else if (tag.is_string_index()) {
2463 result = JVM_CONSTANT_String;
2464 } else if (tag.is_method_type_in_error()) {
2465 result = JVM_CONSTANT_MethodType;
2466 } else if (tag.is_method_handle_in_error()) {
2467 result = JVM_CONSTANT_MethodHandle;
2468 } else if (tag.is_dynamic_constant_in_error()) {
2469 result = JVM_CONSTANT_Dynamic;
2470 }
2471 return result;
2472 }
2473 JVM_END
2474
2475 // Assertion support. //////////////////////////////////////////////////////////
2476
2477 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2478 JVMWrapper("JVM_DesiredAssertionStatus");
2479 assert(cls != NULL, "bad class");
2480
2481 oop r = JNIHandles::resolve(cls);
2482 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2483 if (java_lang_Class::is_primitive(r)) return false;
2484
2485 Klass* k = java_lang_Class::as_Klass(r);
2486 assert(k->is_instance_klass(), "must be an instance klass");
2487 if (!k->is_instance_klass()) return false;
2488
2489 ResourceMark rm(THREAD);
2490 const char* name = k->name()->as_C_string();
2491 bool system_class = k->class_loader() == NULL;
2492 return JavaAssertions::enabled(name, system_class);
2493
2494 JVM_END
2495
2496
2497 // Return a new AssertionStatusDirectives object with the fields filled in with
2498 // command-line assertion arguments (i.e., -ea, -da).
2499 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2500 JVMWrapper("JVM_AssertionStatusDirectives");
2501 JvmtiVMObjectAllocEventCollector oam;
2502 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2503 return JNIHandles::make_local(env, asd);
2504 JVM_END
2505
2506 // Verification ////////////////////////////////////////////////////////////////////////////////
2507
2508 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2509
2510 // RedefineClasses support: bug 6214132 caused verification to fail.
2511 // All functions from this section should call the jvmtiThreadSate function:
2512 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2513 // The function returns a Klass* of the _scratch_class if the verifier
2514 // was invoked in the middle of the class redefinition.
2515 // Otherwise it returns its argument value which is the _the_class Klass*.
2516 // Please, refer to the description in the jvmtiThreadSate.hpp.
2517
2518 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2519 JVMWrapper("JVM_GetClassNameUTF");
2520 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2521 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2522 return k->name()->as_utf8();
2523 JVM_END
2524
2525
2526 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2527 JVMWrapper("JVM_GetClassCPTypes");
2528 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2529 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2530 // types will have length zero if this is not an InstanceKlass
2531 // (length is determined by call to JVM_GetClassCPEntriesCount)
2532 if (k->is_instance_klass()) {
2533 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2534 for (int index = cp->length() - 1; index >= 0; index--) {
2535 constantTag tag = cp->tag_at(index);
2536 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2537 }
2538 }
2539 JVM_END
2540
2541
2542 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2543 JVMWrapper("JVM_GetClassCPEntriesCount");
2544 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2545 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2546 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2547 JVM_END
2548
2549
2550 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2551 JVMWrapper("JVM_GetClassFieldsCount");
2552 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2553 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2554 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2555 JVM_END
2556
2557
2558 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2559 JVMWrapper("JVM_GetClassMethodsCount");
2560 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2561 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2562 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2563 JVM_END
2564
2565
2566 // The following methods, used for the verifier, are never called with
2567 // array klasses, so a direct cast to InstanceKlass is safe.
2568 // Typically, these methods are called in a loop with bounds determined
2569 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2570 // zero for arrays.
2571 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2572 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2573 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2574 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2575 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2576 int length = method->checked_exceptions_length();
2577 if (length > 0) {
2578 CheckedExceptionElement* table= method->checked_exceptions_start();
2579 for (int i = 0; i < length; i++) {
2580 exceptions[i] = table[i].class_cp_index;
2581 }
2582 }
2583 JVM_END
2584
2585
2586 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2587 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2588 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2589 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2590 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2591 return method->checked_exceptions_length();
2592 JVM_END
2593
2594
2595 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2596 JVMWrapper("JVM_GetMethodIxByteCode");
2597 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2598 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2599 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2600 memcpy(code, method->code_base(), method->code_size());
2601 JVM_END
2602
2603
2604 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2605 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2606 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2607 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2608 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2609 return method->code_size();
2610 JVM_END
2611
2612
2613 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2614 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2615 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2616 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2617 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2618 ExceptionTable extable(method);
2619 entry->start_pc = extable.start_pc(entry_index);
2620 entry->end_pc = extable.end_pc(entry_index);
2621 entry->handler_pc = extable.handler_pc(entry_index);
2622 entry->catchType = extable.catch_type_index(entry_index);
2623 JVM_END
2624
2625
2626 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2627 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2628 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2629 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2630 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2631 return method->exception_table_length();
2632 JVM_END
2633
2634
2635 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2636 JVMWrapper("JVM_GetMethodIxModifiers");
2637 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2638 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2639 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2640 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2641 JVM_END
2642
2643
2644 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2645 JVMWrapper("JVM_GetFieldIxModifiers");
2646 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2647 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2648 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2649 JVM_END
2650
2651
2652 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2653 JVMWrapper("JVM_GetMethodIxLocalsCount");
2654 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2655 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2656 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2657 return method->max_locals();
2658 JVM_END
2659
2660
2661 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2662 JVMWrapper("JVM_GetMethodIxArgsSize");
2663 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2664 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2665 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2666 return method->size_of_parameters();
2667 JVM_END
2668
2669
2670 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2671 JVMWrapper("JVM_GetMethodIxMaxStack");
2672 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2673 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2674 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2675 return method->verifier_max_stack();
2676 JVM_END
2677
2678
2679 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2680 JVMWrapper("JVM_IsConstructorIx");
2681 ResourceMark rm(THREAD);
2682 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2683 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2684 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2685 return method->name() == vmSymbols::object_initializer_name();
2686 JVM_END
2687
2688
2689 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2690 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2691 ResourceMark rm(THREAD);
2692 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2693 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2694 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2695 return method->is_overpass();
2696 JVM_END
2697
2698 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2699 JVMWrapper("JVM_GetMethodIxIxUTF");
2700 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2701 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2702 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2703 return method->name()->as_utf8();
2704 JVM_END
2705
2706
2707 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2708 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2709 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2710 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2711 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2712 return method->signature()->as_utf8();
2713 JVM_END
2714
2715 /**
2716 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2717 * read entries in the constant pool. Since the old verifier always
2718 * works on a copy of the code, it will not see any rewriting that
2719 * may possibly occur in the middle of verification. So it is important
2720 * that nothing it calls tries to use the cpCache instead of the raw
2721 * constant pool, so we must use cp->uncached_x methods when appropriate.
2722 */
2723 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2724 JVMWrapper("JVM_GetCPFieldNameUTF");
2725 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2726 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2727 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2728 switch (cp->tag_at(cp_index).value()) {
2729 case JVM_CONSTANT_Fieldref:
2730 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2731 default:
2732 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2733 }
2734 ShouldNotReachHere();
2735 return NULL;
2736 JVM_END
2737
2738
2739 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2740 JVMWrapper("JVM_GetCPMethodNameUTF");
2741 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2742 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2743 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2744 switch (cp->tag_at(cp_index).value()) {
2745 case JVM_CONSTANT_InterfaceMethodref:
2746 case JVM_CONSTANT_Methodref:
2747 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2748 default:
2749 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2750 }
2751 ShouldNotReachHere();
2752 return NULL;
2753 JVM_END
2754
2755
2756 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2757 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2758 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2759 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2760 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2761 switch (cp->tag_at(cp_index).value()) {
2762 case JVM_CONSTANT_InterfaceMethodref:
2763 case JVM_CONSTANT_Methodref:
2764 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2765 default:
2766 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2767 }
2768 ShouldNotReachHere();
2769 return NULL;
2770 JVM_END
2771
2772
2773 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2774 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2775 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2776 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2777 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2778 switch (cp->tag_at(cp_index).value()) {
2779 case JVM_CONSTANT_Fieldref:
2780 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2781 default:
2782 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2783 }
2784 ShouldNotReachHere();
2785 return NULL;
2786 JVM_END
2787
2788
2789 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2790 JVMWrapper("JVM_GetCPClassNameUTF");
2791 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2792 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2793 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2794 Symbol* classname = cp->klass_name_at(cp_index);
2795 return classname->as_utf8();
2796 JVM_END
2797
2798
2799 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2800 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2801 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2802 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2803 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2804 switch (cp->tag_at(cp_index).value()) {
2805 case JVM_CONSTANT_Fieldref: {
2806 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2807 Symbol* classname = cp->klass_name_at(class_index);
2808 return classname->as_utf8();
2809 }
2810 default:
2811 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2812 }
2813 ShouldNotReachHere();
2814 return NULL;
2815 JVM_END
2816
2817
2818 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2819 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2820 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2821 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2822 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2823 switch (cp->tag_at(cp_index).value()) {
2824 case JVM_CONSTANT_Methodref:
2825 case JVM_CONSTANT_InterfaceMethodref: {
2826 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2827 Symbol* classname = cp->klass_name_at(class_index);
2828 return classname->as_utf8();
2829 }
2830 default:
2831 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2832 }
2833 ShouldNotReachHere();
2834 return NULL;
2835 JVM_END
2836
2837
2838 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2839 JVMWrapper("JVM_GetCPFieldModifiers");
2840 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2841 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2842 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2843 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2844 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2845 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2846 switch (cp->tag_at(cp_index).value()) {
2847 case JVM_CONSTANT_Fieldref: {
2848 Symbol* name = cp->uncached_name_ref_at(cp_index);
2849 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2850 InstanceKlass* ik = InstanceKlass::cast(k_called);
2851 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2852 if (fs.name() == name && fs.signature() == signature) {
2853 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2854 }
2855 }
2856 return -1;
2857 }
2858 default:
2859 fatal("JVM_GetCPFieldModifiers: illegal constant");
2860 }
2861 ShouldNotReachHere();
2862 return 0;
2863 JVM_END
2864
2865
2866 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2867 JVMWrapper("JVM_GetCPMethodModifiers");
2868 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2869 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2870 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2871 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2872 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2873 switch (cp->tag_at(cp_index).value()) {
2874 case JVM_CONSTANT_Methodref:
2875 case JVM_CONSTANT_InterfaceMethodref: {
2876 Symbol* name = cp->uncached_name_ref_at(cp_index);
2877 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2878 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2879 int methods_count = methods->length();
2880 for (int i = 0; i < methods_count; i++) {
2881 Method* method = methods->at(i);
2882 if (method->name() == name && method->signature() == signature) {
2883 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2884 }
2885 }
2886 return -1;
2887 }
2888 default:
2889 fatal("JVM_GetCPMethodModifiers: illegal constant");
2890 }
2891 ShouldNotReachHere();
2892 return 0;
2893 JVM_END
2894
2895
2896 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2897
2898 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2899 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2900 JVM_END
2901
2902
2903 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2904 JVMWrapper("JVM_IsSameClassPackage");
2905 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2906 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2907 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2908 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2909 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2910 JVM_END
2911
2912 // Printing support //////////////////////////////////////////////////
2913 extern "C" {
2914
2915 ATTRIBUTE_PRINTF(3, 0)
2916 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2917 // Reject count values that are negative signed values converted to
2918 // unsigned; see bug 4399518, 4417214
2919 if ((intptr_t)count <= 0) return -1;
2920
2921 int result = os::vsnprintf(str, count, fmt, args);
2922 if (result > 0 && (size_t)result >= count) {
2923 result = -1;
2924 }
2925
2926 return result;
2927 }
2928
2929 ATTRIBUTE_PRINTF(3, 4)
2930 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2931 va_list args;
2932 int len;
2933 va_start(args, fmt);
2934 len = jio_vsnprintf(str, count, fmt, args);
2935 va_end(args);
2936 return len;
2937 }
2938
2939 ATTRIBUTE_PRINTF(2, 3)
2940 int jio_fprintf(FILE* f, const char *fmt, ...) {
2941 int len;
2942 va_list args;
2943 va_start(args, fmt);
2944 len = jio_vfprintf(f, fmt, args);
2945 va_end(args);
2946 return len;
2947 }
2948
2949 ATTRIBUTE_PRINTF(2, 0)
2950 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2951 if (Arguments::vfprintf_hook() != NULL) {
2952 return Arguments::vfprintf_hook()(f, fmt, args);
2953 } else {
2954 return vfprintf(f, fmt, args);
2955 }
2956 }
2957
2958 ATTRIBUTE_PRINTF(1, 2)
2959 JNIEXPORT int jio_printf(const char *fmt, ...) {
2960 int len;
2961 va_list args;
2962 va_start(args, fmt);
2963 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2964 va_end(args);
2965 return len;
2966 }
2967
2968 // HotSpot specific jio method
2969 void jio_print(const char* s, size_t len) {
2970 // Try to make this function as atomic as possible.
2971 if (Arguments::vfprintf_hook() != NULL) {
2972 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2973 } else {
2974 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2975 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2976 }
2977 }
2978
2979 } // Extern C
2980
2981 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2982
2983 // In most of the JVM thread support functions we need to access the
2984 // thread through a ThreadsListHandle to prevent it from exiting and
2985 // being reclaimed while we try to operate on it. The exceptions to this
2986 // rule are when operating on the current thread, or if the monitor of
2987 // the target java.lang.Thread is locked at the Java level - in both
2988 // cases the target cannot exit.
2989
2990 static void thread_entry(JavaThread* thread, TRAPS) {
2991 HandleMark hm(THREAD);
2992 Handle obj(THREAD, thread->threadObj());
2993 JavaValue result(T_VOID);
2994 JavaCalls::call_virtual(&result,
2995 obj,
2996 SystemDictionary::Thread_klass(),
2997 vmSymbols::run_method_name(),
2998 vmSymbols::void_method_signature(),
2999 THREAD);
3000 }
3001
3002
3003 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3004 JVMWrapper("JVM_StartThread");
3005 JavaThread *native_thread = NULL;
3006
3007 // We cannot hold the Threads_lock when we throw an exception,
3008 // due to rank ordering issues. Example: we might need to grab the
3009 // Heap_lock while we construct the exception.
3010 bool throw_illegal_thread_state = false;
3011
3012 // We must release the Threads_lock before we can post a jvmti event
3013 // in Thread::start.
3014 {
3015 // Ensure that the C++ Thread and OSThread structures aren't freed before
3016 // we operate.
3017 MutexLocker mu(Threads_lock);
3018
3019 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3020 // re-starting an already started thread, so we should usually find
3021 // that the JavaThread is null. However for a JNI attached thread
3022 // there is a small window between the Thread object being created
3023 // (with its JavaThread set) and the update to its threadStatus, so we
3024 // have to check for this
3025 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
3026 throw_illegal_thread_state = true;
3027 } else {
3028 // We could also check the stillborn flag to see if this thread was already stopped, but
3029 // for historical reasons we let the thread detect that itself when it starts running
3030
3031 jlong size =
3032 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3033 // Allocate the C++ Thread structure and create the native thread. The
3034 // stack size retrieved from java is 64-bit signed, but the constructor takes
3035 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3036 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3037 // - Avoid passing negative values which would result in really large stacks.
3038 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3039 size_t sz = size > 0 ? (size_t) size : 0;
3040 native_thread = new JavaThread(&thread_entry, sz);
3041
3042 // At this point it may be possible that no osthread was created for the
3043 // JavaThread due to lack of memory. Check for this situation and throw
3044 // an exception if necessary. Eventually we may want to change this so
3045 // that we only grab the lock if the thread was created successfully -
3046 // then we can also do this check and throw the exception in the
3047 // JavaThread constructor.
3048 if (native_thread->osthread() != NULL) {
3049 // Note: the current thread is not being used within "prepare".
3050 native_thread->prepare(jthread);
3051 }
3052 }
3053 }
3054
3055 if (throw_illegal_thread_state) {
3056 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3057 }
3058
3059 assert(native_thread != NULL, "Starting null thread?");
3060
3061 if (native_thread->osthread() == NULL) {
3062 // No one should hold a reference to the 'native_thread'.
3063 native_thread->smr_delete();
3064 if (JvmtiExport::should_post_resource_exhausted()) {
3065 JvmtiExport::post_resource_exhausted(
3066 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3067 os::native_thread_creation_failed_msg());
3068 }
3069 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3070 os::native_thread_creation_failed_msg());
3071 }
3072
3073 Thread::start(native_thread);
3074
3075 JVM_END
3076
3077
3078 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3079 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
3080 // but is thought to be reliable and simple. In the case, where the receiver is the
3081 // same thread as the sender, no VM_Operation is needed.
3082 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3083 JVMWrapper("JVM_StopThread");
3084
3085 // A nested ThreadsListHandle will grab the Threads_lock so create
3086 // tlh before we resolve throwable.
3087 ThreadsListHandle tlh(thread);
3088 oop java_throwable = JNIHandles::resolve(throwable);
3089 if (java_throwable == NULL) {
3090 THROW(vmSymbols::java_lang_NullPointerException());
3091 }
3092 oop java_thread = NULL;
3093 JavaThread* receiver = NULL;
3094 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3095 Events::log_exception(thread,
3096 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3097 p2i(receiver), p2i((address)java_thread), p2i(throwable));
3098
3099 if (is_alive) {
3100 // jthread refers to a live JavaThread.
3101 if (thread == receiver) {
3102 // Exception is getting thrown at self so no VM_Operation needed.
3103 THROW_OOP(java_throwable);
3104 } else {
3105 // Use a VM_Operation to throw the exception.
3106 Thread::send_async_exception(java_thread, java_throwable);
3107 }
3108 } else {
3109 // Either:
3110 // - target thread has not been started before being stopped, or
3111 // - target thread already terminated
3112 // We could read the threadStatus to determine which case it is
3113 // but that is overkill as it doesn't matter. We must set the
3114 // stillborn flag for the first case, and if the thread has already
3115 // exited setting this flag has no effect.
3116 java_lang_Thread::set_stillborn(java_thread);
3117 }
3118 JVM_END
3119
3120
3121 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3122 JVMWrapper("JVM_IsThreadAlive");
3123
3124 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3125 return java_lang_Thread::is_alive(thread_oop);
3126 JVM_END
3127
3128
3129 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3130 JVMWrapper("JVM_SuspendThread");
3131
3132 ThreadsListHandle tlh(thread);
3133 JavaThread* receiver = NULL;
3134 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3135 if (is_alive) {
3136 // jthread refers to a live JavaThread.
3137 {
3138 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3139 if (receiver->is_external_suspend()) {
3140 // Don't allow nested external suspend requests. We can't return
3141 // an error from this interface so just ignore the problem.
3142 return;
3143 }
3144 if (receiver->is_exiting()) { // thread is in the process of exiting
3145 return;
3146 }
3147 receiver->set_external_suspend();
3148 }
3149
3150 // java_suspend() will catch threads in the process of exiting
3151 // and will ignore them.
3152 receiver->java_suspend();
3153
3154 // It would be nice to have the following assertion in all the
3155 // time, but it is possible for a racing resume request to have
3156 // resumed this thread right after we suspended it. Temporarily
3157 // enable this assertion if you are chasing a different kind of
3158 // bug.
3159 //
3160 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3161 // receiver->is_being_ext_suspended(), "thread is not suspended");
3162 }
3163 JVM_END
3164
3165
3166 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3167 JVMWrapper("JVM_ResumeThread");
3168
3169 ThreadsListHandle tlh(thread);
3170 JavaThread* receiver = NULL;
3171 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3172 if (is_alive) {
3173 // jthread refers to a live JavaThread.
3174
3175 // This is the original comment for this Threads_lock grab:
3176 // We need to *always* get the threads lock here, since this operation cannot be allowed during
3177 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3178 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3179 // looks at it.
3180 //
3181 // The above comment dates back to when we had both internal and
3182 // external suspend APIs that shared a common underlying mechanism.
3183 // External suspend is now entirely cooperative and doesn't share
3184 // anything with internal suspend. That said, there are some
3185 // assumptions in the VM that an external resume grabs the
3186 // Threads_lock. We can't drop the Threads_lock grab here until we
3187 // resolve the assumptions that exist elsewhere.
3188 //
3189 MutexLocker ml(Threads_lock);
3190 receiver->java_resume();
3191 }
3192 JVM_END
3193
3194
3195 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3196 JVMWrapper("JVM_SetThreadPriority");
3197
3198 ThreadsListHandle tlh(thread);
3199 oop java_thread = NULL;
3200 JavaThread* receiver = NULL;
3201 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3202 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3203
3204 if (is_alive) {
3205 // jthread refers to a live JavaThread.
3206 Thread::set_priority(receiver, (ThreadPriority)prio);
3207 }
3208 // Implied else: If the JavaThread hasn't started yet, then the
3209 // priority set in the java.lang.Thread object above will be pushed
3210 // down when it does start.
3211 JVM_END
3212
3213
3214 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3215 JVMWrapper("JVM_Yield");
3216 if (os::dont_yield()) return;
3217 HOTSPOT_THREAD_YIELD();
3218 os::naked_yield();
3219 JVM_END
3220
3221 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3222 assert(event != NULL, "invariant");
3223 assert(event->should_commit(), "invariant");
3224 event->set_time(millis);
3225 event->commit();
3226 }
3227
3228 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3229 JVMWrapper("JVM_Sleep");
3230
3231 if (millis < 0) {
3232 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3233 }
3234
3235 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3236 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3237 }
3238
3239 // Save current thread state and restore it at the end of this block.
3240 // And set new thread state to SLEEPING.
3241 JavaThreadSleepState jtss(thread);
3242
3243 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3244 EventThreadSleep event;
3245
3246 if (millis == 0) {
3247 os::naked_yield();
3248 } else {
3249 ThreadState old_state = thread->osthread()->get_state();
3250 thread->osthread()->set_state(SLEEPING);
3251 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3252 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3253 // us while we were sleeping. We do not overwrite those.
3254 if (!HAS_PENDING_EXCEPTION) {
3255 if (event.should_commit()) {
3256 post_thread_sleep_event(&event, millis);
3257 }
3258 HOTSPOT_THREAD_SLEEP_END(1);
3259
3260 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3261 // to properly restore the thread state. That's likely wrong.
3262 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3263 }
3264 }
3265 thread->osthread()->set_state(old_state);
3266 }
3267 if (event.should_commit()) {
3268 post_thread_sleep_event(&event, millis);
3269 }
3270 HOTSPOT_THREAD_SLEEP_END(0);
3271 JVM_END
3272
3273 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3274 JVMWrapper("JVM_CurrentThread");
3275 oop jthread = thread->threadObj();
3276 assert (thread != NULL, "no current thread!");
3277 return JNIHandles::make_local(env, jthread);
3278 JVM_END
3279
3280
3281 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3282 JVMWrapper("JVM_CountStackFrames");
3283
3284 uint32_t debug_bits = 0;
3285 ThreadsListHandle tlh(thread);
3286 JavaThread* receiver = NULL;
3287 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3288 int count = 0;
3289 if (is_alive) {
3290 // jthread refers to a live JavaThread.
3291 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
3292 // Count all java activation, i.e., number of vframes.
3293 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) {
3294 // Native frames are not counted.
3295 if (!vfst.method()->is_native()) count++;
3296 }
3297 } else {
3298 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3299 "this thread is not suspended");
3300 }
3301 }
3302 // Implied else: if JavaThread is not alive simply return a count of 0.
3303
3304 return count;
3305 JVM_END
3306
3307
3308 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3309 JVMWrapper("JVM_Interrupt");
3310
3311 ThreadsListHandle tlh(thread);
3312 JavaThread* receiver = NULL;
3313 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3314 if (is_alive) {
3315 // jthread refers to a live JavaThread.
3316 Thread::interrupt(receiver);
3317 }
3318 JVM_END
3319
3320
3321 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3322 JVMWrapper("JVM_IsInterrupted");
3323
3324 ThreadsListHandle tlh(thread);
3325 JavaThread* receiver = NULL;
3326 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3327 if (is_alive) {
3328 // jthread refers to a live JavaThread.
3329 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3330 } else {
3331 return JNI_FALSE;
3332 }
3333 JVM_END
3334
3335
3336 // Return true iff the current thread has locked the object passed in
3337
3338 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3339 JVMWrapper("JVM_HoldsLock");
3340 assert(THREAD->is_Java_thread(), "sanity check");
3341 if (obj == NULL) {
3342 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3343 }
3344 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3345 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3346 JVM_END
3347
3348
3349 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3350 JVMWrapper("JVM_DumpAllStacks");
3351 VM_PrintThreads op;
3352 VMThread::execute(&op);
3353 if (JvmtiExport::should_post_data_dump()) {
3354 JvmtiExport::post_data_dump();
3355 }
3356 JVM_END
3357
3358 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3359 JVMWrapper("JVM_SetNativeThreadName");
3360
3361 // We don't use a ThreadsListHandle here because the current thread
3362 // must be alive.
3363 oop java_thread = JNIHandles::resolve_non_null(jthread);
3364 JavaThread* thr = java_lang_Thread::thread(java_thread);
3365 if (thread == thr && !thr->has_attached_via_jni()) {
3366 // Thread naming is only supported for the current thread and
3367 // we don't set the name of an attached thread to avoid stepping
3368 // on other programs.
3369 ResourceMark rm(thread);
3370 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3371 os::set_native_thread_name(thread_name);
3372 }
3373 JVM_END
3374
3375 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3376
3377 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3378 JVMWrapper("JVM_GetClassContext");
3379 ResourceMark rm(THREAD);
3380 JvmtiVMObjectAllocEventCollector oam;
3381 vframeStream vfst(thread);
3382
3383 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3384 // This must only be called from SecurityManager.getClassContext
3385 Method* m = vfst.method();
3386 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3387 m->name() == vmSymbols::getClassContext_name() &&
3388 m->signature() == vmSymbols::void_class_array_signature())) {
3389 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3390 }
3391 }
3392
3393 // Collect method holders
3394 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3395 for (; !vfst.at_end(); vfst.security_next()) {
3396 Method* m = vfst.method();
3397 // Native frames are not returned
3398 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3399 Klass* holder = m->method_holder();
3400 assert(holder->is_klass(), "just checking");
3401 klass_array->append(holder);
3402 }
3403 }
3404
3405 // Create result array of type [Ljava/lang/Class;
3406 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3407 // Fill in mirrors corresponding to method holders
3408 for (int i = 0; i < klass_array->length(); i++) {
3409 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3410 }
3411
3412 return (jobjectArray) JNIHandles::make_local(env, result);
3413 JVM_END
3414
3415
3416 // java.lang.Package ////////////////////////////////////////////////////////////////
3417
3418
3419 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3420 JVMWrapper("JVM_GetSystemPackage");
3421 ResourceMark rm(THREAD);
3422 JvmtiVMObjectAllocEventCollector oam;
3423 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3424 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3425 return (jstring) JNIHandles::make_local(result);
3426 JVM_END
3427
3428
3429 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3430 JVMWrapper("JVM_GetSystemPackages");
3431 JvmtiVMObjectAllocEventCollector oam;
3432 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3433 return (jobjectArray) JNIHandles::make_local(result);
3434 JVM_END
3435
3436
3437 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3438
3439
3440 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3441 JVMWrapper("JVM_GetAndClearReferencePendingList");
3442
3443 MonitorLockerEx ml(Heap_lock);
3444 oop ref = Universe::reference_pending_list();
3445 if (ref != NULL) {
3446 Universe::set_reference_pending_list(NULL);
3447 }
3448 return JNIHandles::make_local(env, ref);
3449 JVM_END
3450
3451 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3452 JVMWrapper("JVM_HasReferencePendingList");
3453 MonitorLockerEx ml(Heap_lock);
3454 return Universe::has_reference_pending_list();
3455 JVM_END
3456
3457 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3458 JVMWrapper("JVM_WaitForReferencePendingList");
3459 MonitorLockerEx ml(Heap_lock);
3460 while (!Universe::has_reference_pending_list()) {
3461 ml.wait();
3462 }
3463 JVM_END
3464
3465
3466 // ObjectInputStream ///////////////////////////////////////////////////////////////
3467
3468 // Return the first user-defined class loader up the execution stack, or null
3469 // if only code from the bootstrap or platform class loader is on the stack.
3470
3471 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3472 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3473 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3474 oop loader = vfst.method()->method_holder()->class_loader();
3475 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3476 return JNIHandles::make_local(env, loader);
3477 }
3478 }
3479 return NULL;
3480 JVM_END
3481
3482
3483 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3484
3485
3486 // resolve array handle and check arguments
3487 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3488 if (arr == NULL) {
3489 THROW_0(vmSymbols::java_lang_NullPointerException());
3490 }
3491 oop a = JNIHandles::resolve_non_null(arr);
3492 if (!a->is_array()) {
3493 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3494 } else if (type_array_only && !a->is_typeArray()) {
3495 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3496 }
3497 return arrayOop(a);
3498 }
3499
3500
3501 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3502 JVMWrapper("JVM_GetArrayLength");
3503 arrayOop a = check_array(env, arr, false, CHECK_0);
3504 return a->length();
3505 JVM_END
3506
3507
3508 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3509 JVMWrapper("JVM_Array_Get");
3510 JvmtiVMObjectAllocEventCollector oam;
3511 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3512 jvalue value;
3513 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3514 oop box = Reflection::box(&value, type, CHECK_NULL);
3515 return JNIHandles::make_local(env, box);
3516 JVM_END
3517
3518
3519 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3520 JVMWrapper("JVM_GetPrimitiveArrayElement");
3521 jvalue value;
3522 value.i = 0; // to initialize value before getting used in CHECK
3523 arrayOop a = check_array(env, arr, true, CHECK_(value));
3524 assert(a->is_typeArray(), "just checking");
3525 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3526 BasicType wide_type = (BasicType) wCode;
3527 if (type != wide_type) {
3528 Reflection::widen(&value, type, wide_type, CHECK_(value));
3529 }
3530 return value;
3531 JVM_END
3532
3533
3534 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3535 JVMWrapper("JVM_SetArrayElement");
3536 arrayOop a = check_array(env, arr, false, CHECK);
3537 oop box = JNIHandles::resolve(val);
3538 jvalue value;
3539 value.i = 0; // to initialize value before getting used in CHECK
3540 BasicType value_type;
3541 if (a->is_objArray()) {
3542 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3543 value_type = Reflection::unbox_for_regular_object(box, &value);
3544 } else {
3545 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3546 }
3547 Reflection::array_set(&value, a, index, value_type, CHECK);
3548 JVM_END
3549
3550
3551 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3552 JVMWrapper("JVM_SetPrimitiveArrayElement");
3553 arrayOop a = check_array(env, arr, true, CHECK);
3554 assert(a->is_typeArray(), "just checking");
3555 BasicType value_type = (BasicType) vCode;
3556 Reflection::array_set(&v, a, index, value_type, CHECK);
3557 JVM_END
3558
3559
3560 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3561 JVMWrapper("JVM_NewArray");
3562 JvmtiVMObjectAllocEventCollector oam;
3563 oop element_mirror = JNIHandles::resolve(eltClass);
3564 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3565 return JNIHandles::make_local(env, result);
3566 JVM_END
3567
3568
3569 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3570 JVMWrapper("JVM_NewMultiArray");
3571 JvmtiVMObjectAllocEventCollector oam;
3572 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3573 oop element_mirror = JNIHandles::resolve(eltClass);
3574 assert(dim_array->is_typeArray(), "just checking");
3575 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3576 return JNIHandles::make_local(env, result);
3577 JVM_END
3578
3579
3580 // Library support ///////////////////////////////////////////////////////////////////////////
3581
3582 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3583 //%note jvm_ct
3584 JVMWrapper("JVM_LoadLibrary");
3585 char ebuf[1024];
3586 void *load_result;
3587 {
3588 ThreadToNativeFromVM ttnfvm(thread);
3589 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3590 }
3591 if (load_result == NULL) {
3592 char msg[1024];
3593 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3594 // Since 'ebuf' may contain a string encoded using
3595 // platform encoding scheme, we need to pass
3596 // Exceptions::unsafe_to_utf8 to the new_exception method
3597 // as the last argument. See bug 6367357.
3598 Handle h_exception =
3599 Exceptions::new_exception(thread,
3600 vmSymbols::java_lang_UnsatisfiedLinkError(),
3601 msg, Exceptions::unsafe_to_utf8);
3602
3603 THROW_HANDLE_0(h_exception);
3604 }
3605 return load_result;
3606 JVM_END
3607
3608
3609 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3610 JVMWrapper("JVM_UnloadLibrary");
3611 os::dll_unload(handle);
3612 JVM_END
3613
3614
3615 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3616 JVMWrapper("JVM_FindLibraryEntry");
3617 return os::dll_lookup(handle, name);
3618 JVM_END
3619
3620
3621 // JNI version ///////////////////////////////////////////////////////////////////////////////
3622
3623 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3624 JVMWrapper("JVM_IsSupportedJNIVersion");
3625 return Threads::is_supported_jni_version_including_1_1(version);
3626 JVM_END
3627
3628
3629 // String support ///////////////////////////////////////////////////////////////////////////
3630
3631 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3632 JVMWrapper("JVM_InternString");
3633 JvmtiVMObjectAllocEventCollector oam;
3634 if (str == NULL) return NULL;
3635 oop string = JNIHandles::resolve_non_null(str);
3636 oop result = StringTable::intern(string, CHECK_NULL);
3637 return (jstring) JNIHandles::make_local(env, result);
3638 JVM_END
3639
3640
3641 // Raw monitor support //////////////////////////////////////////////////////////////////////
3642
3643 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3644 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3645 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3646 // that only works with java threads.
3647
3648
3649 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3650 VM_Exit::block_if_vm_exited();
3651 JVMWrapper("JVM_RawMonitorCreate");
3652 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3653 }
3654
3655
3656 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3657 VM_Exit::block_if_vm_exited();
3658 JVMWrapper("JVM_RawMonitorDestroy");
3659 delete ((Mutex*) mon);
3660 }
3661
3662
3663 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3664 VM_Exit::block_if_vm_exited();
3665 JVMWrapper("JVM_RawMonitorEnter");
3666 ((Mutex*) mon)->jvm_raw_lock();
3667 return 0;
3668 }
3669
3670
3671 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3672 VM_Exit::block_if_vm_exited();
3673 JVMWrapper("JVM_RawMonitorExit");
3674 ((Mutex*) mon)->jvm_raw_unlock();
3675 }
3676
3677
3678 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3679
3680 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3681 Handle loader, Handle protection_domain,
3682 jboolean throwError, TRAPS) {
3683 // Security Note:
3684 // The Java level wrapper will perform the necessary security check allowing
3685 // us to pass the NULL as the initiating class loader. The VM is responsible for
3686 // the checkPackageAccess relative to the initiating class loader via the
3687 // protection_domain. The protection_domain is passed as NULL by the java code
3688 // if there is no security manager in 3-arg Class.forName().
3689 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3690
3691 // Check if we should initialize the class
3692 if (init && klass->is_instance_klass()) {
3693 klass->initialize(CHECK_NULL);
3694 }
3695 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3696 }
3697
3698
3699 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3700
3701 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3702 JVMWrapper("JVM_InvokeMethod");
3703 Handle method_handle;
3704 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3705 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3706 Handle receiver(THREAD, JNIHandles::resolve(obj));
3707 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3708 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3709 jobject res = JNIHandles::make_local(env, result);
3710 if (JvmtiExport::should_post_vm_object_alloc()) {
3711 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3712 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3713 if (java_lang_Class::is_primitive(ret_type)) {
3714 // Only for primitive type vm allocates memory for java object.
3715 // See box() method.
3716 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3717 }
3718 }
3719 return res;
3720 } else {
3721 THROW_0(vmSymbols::java_lang_StackOverflowError());
3722 }
3723 JVM_END
3724
3725
3726 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3727 JVMWrapper("JVM_NewInstanceFromConstructor");
3728 oop constructor_mirror = JNIHandles::resolve(c);
3729 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3730 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3731 jobject res = JNIHandles::make_local(env, result);
3732 if (JvmtiExport::should_post_vm_object_alloc()) {
3733 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3734 }
3735 return res;
3736 JVM_END
3737
3738 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3739
3740 JVM_LEAF(jboolean, JVM_SupportsCX8())
3741 JVMWrapper("JVM_SupportsCX8");
3742 return VM_Version::supports_cx8();
3743 JVM_END
3744
3745 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3746 JVMWrapper("JVM_InitializeFromArchive");
3747 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3748 assert(k->is_klass(), "just checking");
3749 HeapShared::initialize_from_archived_subgraph(k);
3750 JVM_END
3751
3752 // Returns an array of all live Thread objects (VM internal JavaThreads,
3753 // jvmti agent threads, and JNI attaching threads are skipped)
3754 // See CR 6404306 regarding JNI attaching threads
3755 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3756 ResourceMark rm(THREAD);
3757 ThreadsListEnumerator tle(THREAD, false, false);
3758 JvmtiVMObjectAllocEventCollector oam;
3759
3760 int num_threads = tle.num_threads();
3761 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3762 objArrayHandle threads_ah(THREAD, r);
3763
3764 for (int i = 0; i < num_threads; i++) {
3765 Handle h = tle.get_threadObj(i);
3766 threads_ah->obj_at_put(i, h());
3767 }
3768
3769 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3770 JVM_END
3771
3772
3773 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3774 // Return StackTraceElement[][], each element is the stack trace of a thread in
3775 // the corresponding entry in the given threads array
3776 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3777 JVMWrapper("JVM_DumpThreads");
3778 JvmtiVMObjectAllocEventCollector oam;
3779
3780 // Check if threads is null
3781 if (threads == NULL) {
3782 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3783 }
3784
3785 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3786 objArrayHandle ah(THREAD, a);
3787 int num_threads = ah->length();
3788 // check if threads is non-empty array
3789 if (num_threads == 0) {
3790 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3791 }
3792
3793 // check if threads is not an array of objects of Thread class
3794 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3795 if (k != SystemDictionary::Thread_klass()) {
3796 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3797 }
3798
3799 ResourceMark rm(THREAD);
3800
3801 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3802 for (int i = 0; i < num_threads; i++) {
3803 oop thread_obj = ah->obj_at(i);
3804 instanceHandle h(THREAD, (instanceOop) thread_obj);
3805 thread_handle_array->append(h);
3806 }
3807
3808 // The JavaThread references in thread_handle_array are validated
3809 // in VM_ThreadDump::doit().
3810 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3811 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3812
3813 JVM_END
3814
3815 // JVM monitoring and management support
3816 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3817 return Management::get_jmm_interface(version);
3818 JVM_END
3819
3820 // com.sun.tools.attach.VirtualMachine agent properties support
3821 //
3822 // Initialize the agent properties with the properties maintained in the VM
3823 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3824 JVMWrapper("JVM_InitAgentProperties");
3825 ResourceMark rm;
3826
3827 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3828
3829 PUTPROP(props, "sun.java.command", Arguments::java_command());
3830 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3831 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3832 return properties;
3833 JVM_END
3834
3835 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3836 {
3837 JVMWrapper("JVM_GetEnclosingMethodInfo");
3838 JvmtiVMObjectAllocEventCollector oam;
3839
3840 if (ofClass == NULL) {
3841 return NULL;
3842 }
3843 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3844 // Special handling for primitive objects
3845 if (java_lang_Class::is_primitive(mirror())) {
3846 return NULL;
3847 }
3848 Klass* k = java_lang_Class::as_Klass(mirror());
3849 if (!k->is_instance_klass()) {
3850 return NULL;
3851 }
3852 InstanceKlass* ik = InstanceKlass::cast(k);
3853 int encl_method_class_idx = ik->enclosing_method_class_index();
3854 if (encl_method_class_idx == 0) {
3855 return NULL;
3856 }
3857 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3858 objArrayHandle dest(THREAD, dest_o);
3859 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3860 dest->obj_at_put(0, enc_k->java_mirror());
3861 int encl_method_method_idx = ik->enclosing_method_method_index();
3862 if (encl_method_method_idx != 0) {
3863 Symbol* sym = ik->constants()->symbol_at(
3864 extract_low_short_from_int(
3865 ik->constants()->name_and_type_at(encl_method_method_idx)));
3866 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3867 dest->obj_at_put(1, str());
3868 sym = ik->constants()->symbol_at(
3869 extract_high_short_from_int(
3870 ik->constants()->name_and_type_at(encl_method_method_idx)));
3871 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3872 dest->obj_at_put(2, str());
3873 }
3874 return (jobjectArray) JNIHandles::make_local(dest());
3875 }
3876 JVM_END
3877
3878 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3879 {
3880 memset(info, 0, info_size);
3881
3882 info->jvm_version = VM_Version::jvm_version();
3883 info->patch_version = VM_Version::vm_patch_version();
3884
3885 // when we add a new capability in the jvm_version_info struct, we should also
3886 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3887 // counter defined in runtimeService.cpp.
3888 info->is_attach_supported = AttachListener::is_attach_supported();
3889 }
3890 JVM_END
3891
3892 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3893 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3894 ResourceMark rm(THREAD);
3895
3896 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3897 return NULL;
3898 }
3899
3900 char** vm_flags = Arguments::jvm_flags_array();
3901 char** vm_args = Arguments::jvm_args_array();
3902 int num_flags = Arguments::num_jvm_flags();
3903 int num_args = Arguments::num_jvm_args();
3904
3905 InstanceKlass* ik = SystemDictionary::String_klass();
3906 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3907 objArrayHandle result_h(THREAD, r);
3908
3909 int index = 0;
3910 for (int j = 0; j < num_flags; j++, index++) {
3911 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3912 result_h->obj_at_put(index, h());
3913 }
3914 for (int i = 0; i < num_args; i++, index++) {
3915 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3916 result_h->obj_at_put(index, h());
3917 }
3918 return (jobjectArray) JNIHandles::make_local(env, result_h());
3919 JVM_END
3920
3921 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3922 return os::get_signal_number(name);
3923 JVM_END