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