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 NULL, // dynamic_nest_host
936 CHECK_NULL);
937
938 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
939 trace_class_resolution(k);
940 }
941
942 return (jclass) JNIHandles::make_local(env, k->java_mirror());
943 }
944
945 enum {
946 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
947 NONFINDABLE_CLASS = java_lang_invoke_MemberName::MN_NONFINDABLE_CLASS,
948 WEAK_CLASS = java_lang_invoke_MemberName::MN_WEAK_CLASS,
949 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
950 };
951
952 /*
953 * Define a class with the specified flags that indicates if it's a nestmate,
954 * not findable, or weakly reachable from class loader.
955 *
956 * Same class may be defined by multiple threads at the same time.
957 * Should the VM keep the classData (the one successfully defined the class)
958 * as if a private static field is declared in the class?
959 */
960 static jclass jvm_lookup_define_class(JNIEnv *env, jclass lookup, const char *name,
961 jobject loader, const jbyte *buf, jsize len, jobject pd,
962 int flags, jobject classData, TRAPS) {
963 assert(THREAD->is_Java_thread(), "must be a JavaThread");
964 JavaThread* jt = (JavaThread*) THREAD;
965 ResourceMark rm(THREAD);
966
967 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
968 // Lookup class must be a non-null instance
969 if (k == NULL) {
970 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
971 }
972 assert(k->is_instance_klass(), "Lookup class must be an instance klass");
973
974 jboolean is_nestmate = (flags & NESTMATE) == NESTMATE;
975 jboolean is_nonfindable = (flags & NONFINDABLE_CLASS) == NONFINDABLE_CLASS;
976 jboolean is_weak = (flags & WEAK_CLASS) == WEAK_CLASS;
977 jboolean vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
978
979 InstanceKlass* host_class = NULL;
980 if (is_nestmate) {
981 // we need to find the true nest-host of the lookup class,
982 // so any exceptions in nest validation must be thrown
983 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
984 host_class = InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
985 }
986
987 // classData (constant pool patching replacement) is only applicable for nonfindable classes
988 if (classData != NULL && !is_nonfindable) {
989 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for nonfindable classes");
990 }
991
992 // vm_annotations only allowed for nonfindable classes
993 if (vm_annotations && !is_nonfindable) {
994 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for weak nonfindable classes");
995 }
996
997 if (log_is_enabled(Info, class, nestmates)) {
998 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
999 name,
1000 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1001 is_nestmate ? host_class->external_name() : "",
1002 is_nonfindable ? "non-findable" : "findable",
1003 is_weak ? "weak" : "strong",
1004 vm_annotations ? "with vm annotations" : "without vm annotation");
1005 }
1006
1007 // Since exceptions can be thrown, class initialization can take place
1008 // if name is NULL no check for class name in .class stream has to be made.
1009 TempNewSymbol class_name = NULL;
1010 if (name != NULL) {
1011 const int str_len = (int)strlen(name);
1012 if (str_len > Symbol::max_length()) {
1013 // It's impossible to create this class; the name cannot fit
1014 // into the constant pool.
1015 Exceptions::fthrow(THREAD_AND_LOCATION,
1016 vmSymbols::java_lang_NoClassDefFoundError(),
1017 "Class name exceeds maximum length of %d: %s",
1018 Symbol::max_length(),
1019 name);
1020 return 0;
1021 }
1022 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
1023 }
1024
1025 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1026 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1027 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1028 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1029
1030 if (!is_nonfindable) {
1031 k = SystemDictionary::resolve_from_stream(class_name,
1032 class_loader,
1033 protection_domain,
1034 &st,
1035 host_class,
1036 CHECK_NULL);
1037
1038 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
1039 trace_class_resolution(k);
1040 }
1041 } else { //nonfindable
1042 k = SystemDictionary::parse_stream(class_name,
1043 class_loader,
1044 protection_domain,
1045 &st,
1046 NULL, // unsafe_anonymous_host
1047 NULL, // cp_patches
1048 is_nonfindable,
1049 true, // is_weak - workaround to allow access to VM annotations
1050 host_class,
1051 CHECK_NULL);
1052 if (k == NULL) {
1053 THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a nonfindable class");
1054 }
1055
1056 // The nonfindable class loader data has been artificially been kept alive to
1057 // this point. The mirror and any instances of this class have to keep
1058 // it alive afterwards.
1059 InstanceKlass::cast(k)->class_loader_data()->dec_keep_alive();
1060 }
1061
1062 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1063 InstanceKlass* ik = InstanceKlass::cast(k);
1064 ModuleEntry* module = ik->module();
1065 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1066 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1067 module_name,
1068 ik->external_name(),
1069 host_class->external_name(),
1070 ik->is_nonfindable() ? "is non-findable" : "is findable");
1071 }
1072
1073 return (jclass) JNIHandles::make_local(env, k->java_mirror());
1074 }
1075
1076 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1077 JVMWrapper("JVM_DefineClass");
1078
1079 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
1080 JVM_END
1081
1082 /*
1083 * Define a class with the specified lookup class.
1084 * lookup: Lookup class
1085 * name: the name of the class
1086 * loader: defining class loader
1087 * buf: class bytes
1088 * len: length of class bytes
1089 * pd: protection domain
1090 * flags: properties of the class
1091 * classData: private static pre-initialized field
1092 */
1093 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, jobject loader,
1094 const jbyte *buf, jsize len, jobject pd, int flags, jobject classData))
1095 JVMWrapper("JVM_LookupDefineClass");
1096
1097 if (lookup == NULL) {
1098 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1099 }
1100
1101 assert(buf != NULL, "buf must not be NULL");
1102
1103 return jvm_lookup_define_class(env, lookup, name, loader, buf, len, pd, flags, classData, THREAD);
1104 JVM_END
1105
1106 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1107 JVMWrapper("JVM_DefineClassWithSource");
1108
1109 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
1110 JVM_END
1111
1112 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1113 JVMWrapper("JVM_FindLoadedClass");
1114 ResourceMark rm(THREAD);
1115
1116 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1117 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
1118
1119 const char* str = java_lang_String::as_utf8_string(string());
1120 // Sanity check, don't expect null
1121 if (str == NULL) return NULL;
1122
1123 const int str_len = (int)strlen(str);
1124 if (str_len > Symbol::max_length()) {
1125 // It's impossible to create this class; the name cannot fit
1126 // into the constant pool.
1127 return NULL;
1128 }
1129 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
1130
1131 // Security Note:
1132 // The Java level wrapper will perform the necessary security check allowing
1133 // us to pass the NULL as the initiating class loader.
1134 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1135 if (UsePerfData) {
1136 is_lock_held_by_thread(h_loader,
1137 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1138 THREAD);
1139 }
1140
1141 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1142 h_loader,
1143 Handle(),
1144 CHECK_NULL);
1145 #if INCLUDE_CDS
1146 if (k == NULL) {
1147 // If the class is not already loaded, try to see if it's in the shared
1148 // archive for the current classloader (h_loader).
1149 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1150 }
1151 #endif
1152 return (k == NULL) ? NULL :
1153 (jclass) JNIHandles::make_local(env, k->java_mirror());
1154 JVM_END
1155
1156 // Module support //////////////////////////////////////////////////////////////////////////////
1157
1158 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1159 jstring location, const char* const* packages, jsize num_packages))
1160 JVMWrapper("JVM_DefineModule");
1161 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1162 JVM_END
1163
1164 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1165 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1166 Modules::set_bootloader_unnamed_module(module, CHECK);
1167 JVM_END
1168
1169 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1170 JVMWrapper("JVM_AddModuleExports");
1171 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1172 JVM_END
1173
1174 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1175 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1176 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1177 JVM_END
1178
1179 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1180 JVMWrapper("JVM_AddModuleExportsToAll");
1181 Modules::add_module_exports(from_module, package, NULL, CHECK);
1182 JVM_END
1183
1184 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1185 JVMWrapper("JVM_AddReadsModule");
1186 Modules::add_reads_module(from_module, source_module, CHECK);
1187 JVM_END
1188
1189 // Reflection support //////////////////////////////////////////////////////////////////////////////
1190
1191 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1192 assert (cls != NULL, "illegal class");
1193 JVMWrapper("JVM_GetClassName");
1194 JvmtiVMObjectAllocEventCollector oam;
1195 ResourceMark rm(THREAD);
1196 const char* name;
1197 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1198 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1199 } else {
1200 // Consider caching interned string in Klass
1201 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1202 assert(k->is_klass(), "just checking");
1203 name = k->external_name();
1204 }
1205 oop result = StringTable::intern((char*) name, CHECK_NULL);
1206 return (jstring) JNIHandles::make_local(env, result);
1207 JVM_END
1208
1209
1210 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1211 JVMWrapper("JVM_GetClassInterfaces");
1212 JvmtiVMObjectAllocEventCollector oam;
1213 oop mirror = JNIHandles::resolve_non_null(cls);
1214
1215 // Special handling for primitive objects
1216 if (java_lang_Class::is_primitive(mirror)) {
1217 // Primitive objects does not have any interfaces
1218 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1219 return (jobjectArray) JNIHandles::make_local(env, r);
1220 }
1221
1222 Klass* klass = java_lang_Class::as_Klass(mirror);
1223 // Figure size of result array
1224 int size;
1225 if (klass->is_instance_klass()) {
1226 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1227 } else {
1228 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1229 size = 2;
1230 }
1231
1232 // Allocate result array
1233 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1234 objArrayHandle result (THREAD, r);
1235 // Fill in result
1236 if (klass->is_instance_klass()) {
1237 // Regular instance klass, fill in all local interfaces
1238 for (int index = 0; index < size; index++) {
1239 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1240 result->obj_at_put(index, k->java_mirror());
1241 }
1242 } else {
1243 // All arrays implement java.lang.Cloneable and java.io.Serializable
1244 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1245 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1246 }
1247 return (jobjectArray) JNIHandles::make_local(env, result());
1248 JVM_END
1249
1250
1251 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1252 JVMWrapper("JVM_IsInterface");
1253 oop mirror = JNIHandles::resolve_non_null(cls);
1254 if (java_lang_Class::is_primitive(mirror)) {
1255 return JNI_FALSE;
1256 }
1257 Klass* k = java_lang_Class::as_Klass(mirror);
1258 jboolean result = k->is_interface();
1259 assert(!result || k->is_instance_klass(),
1260 "all interfaces are instance types");
1261 // The compiler intrinsic for isInterface tests the
1262 // Klass::_access_flags bits in the same way.
1263 return result;
1264 JVM_END
1265
1266
1267 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1268 JVMWrapper("JVM_GetClassSigners");
1269 JvmtiVMObjectAllocEventCollector oam;
1270 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1271 // There are no signers for primitive types
1272 return NULL;
1273 }
1274
1275 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1276
1277 // If there are no signers set in the class, or if the class
1278 // is an array, return NULL.
1279 if (signers == NULL) return NULL;
1280
1281 // copy of the signers array
1282 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1283 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1284 for (int index = 0; index < signers->length(); index++) {
1285 signers_copy->obj_at_put(index, signers->obj_at(index));
1286 }
1287
1288 // return the copy
1289 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1290 JVM_END
1291
1292
1293 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1294 JVMWrapper("JVM_SetClassSigners");
1295 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1296 // This call is ignored for primitive types and arrays.
1297 // Signers are only set once, ClassLoader.java, and thus shouldn't
1298 // be called with an array. Only the bootstrap loader creates arrays.
1299 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1300 if (k->is_instance_klass()) {
1301 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1302 }
1303 }
1304 JVM_END
1305
1306
1307 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1308 JVMWrapper("JVM_GetProtectionDomain");
1309 if (JNIHandles::resolve(cls) == NULL) {
1310 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1311 }
1312
1313 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1314 // Primitive types does not have a protection domain.
1315 return NULL;
1316 }
1317
1318 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1319 return (jobject) JNIHandles::make_local(env, pd);
1320 JVM_END
1321
1322
1323 static bool is_authorized(Handle context, InstanceKlass* klass, TRAPS) {
1324 // If there is a security manager and protection domain, check the access
1325 // in the protection domain, otherwise it is authorized.
1326 if (java_lang_System::has_security_manager()) {
1327
1328 // For bootstrapping, if pd implies method isn't in the JDK, allow
1329 // this context to revert to older behavior.
1330 // In this case the isAuthorized field in AccessControlContext is also not
1331 // present.
1332 if (Universe::protection_domain_implies_method() == NULL) {
1333 return true;
1334 }
1335
1336 // Whitelist certain access control contexts
1337 if (java_security_AccessControlContext::is_authorized(context)) {
1338 return true;
1339 }
1340
1341 oop prot = klass->protection_domain();
1342 if (prot != NULL) {
1343 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1344 // in the new wrapper.
1345 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1346 Handle h_prot(THREAD, prot);
1347 JavaValue result(T_BOOLEAN);
1348 JavaCallArguments args(h_prot);
1349 JavaCalls::call(&result, m, &args, CHECK_false);
1350 return (result.get_jboolean() != 0);
1351 }
1352 }
1353 return true;
1354 }
1355
1356 // Create an AccessControlContext with a protection domain with null codesource
1357 // and null permissions - which gives no permissions.
1358 oop create_dummy_access_control_context(TRAPS) {
1359 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1360 // Call constructor ProtectionDomain(null, null);
1361 Handle obj = JavaCalls::construct_new_instance(pd_klass,
1362 vmSymbols::codesource_permissioncollection_signature(),
1363 Handle(), Handle(), CHECK_NULL);
1364
1365 // new ProtectionDomain[] {pd};
1366 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1367 context->obj_at_put(0, obj());
1368
1369 // new AccessControlContext(new ProtectionDomain[] {pd})
1370 objArrayHandle h_context(THREAD, context);
1371 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1372 return acc;
1373 }
1374
1375 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1376 JVMWrapper("JVM_DoPrivileged");
1377
1378 if (action == NULL) {
1379 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1380 }
1381
1382 // Compute the frame initiating the do privileged operation and setup the privileged stack
1383 vframeStream vfst(thread);
1384 vfst.security_get_caller_frame(1);
1385
1386 if (vfst.at_end()) {
1387 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1388 }
1389
1390 Method* method = vfst.method();
1391 InstanceKlass* klass = method->method_holder();
1392
1393 // Check that action object understands "Object run()"
1394 Handle h_context;
1395 if (context != NULL) {
1396 h_context = Handle(THREAD, JNIHandles::resolve(context));
1397 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1398 if (!authorized) {
1399 // Create an unprivileged access control object and call it's run function
1400 // instead.
1401 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1402 h_context = Handle(THREAD, noprivs);
1403 }
1404 }
1405
1406 // Check that action object understands "Object run()"
1407 Handle object (THREAD, JNIHandles::resolve(action));
1408
1409 // get run() method
1410 Method* m_oop = object->klass()->uncached_lookup_method(
1411 vmSymbols::run_method_name(),
1412 vmSymbols::void_object_signature(),
1413 Klass::find_overpass);
1414
1415 // See if there is a default method for "Object run()".
1416 if (m_oop == NULL && object->klass()->is_instance_klass()) {
1417 InstanceKlass* iklass = InstanceKlass::cast(object->klass());
1418 m_oop = iklass->lookup_method_in_ordered_interfaces(
1419 vmSymbols::run_method_name(),
1420 vmSymbols::void_object_signature());
1421 }
1422
1423 methodHandle m (THREAD, m_oop);
1424 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static() || m()->is_abstract()) {
1425 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1426 }
1427
1428 // Stack allocated list of privileged stack elements
1429 PrivilegedElement pi;
1430 if (!vfst.at_end()) {
1431 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1432 thread->set_privileged_stack_top(&pi);
1433 }
1434
1435
1436 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1437 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1438 Handle pending_exception;
1439 JavaValue result(T_OBJECT);
1440 JavaCallArguments args(object);
1441 JavaCalls::call(&result, m, &args, THREAD);
1442
1443 // done with action, remove ourselves from the list
1444 if (!vfst.at_end()) {
1445 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1446 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1447 }
1448
1449 if (HAS_PENDING_EXCEPTION) {
1450 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1451 CLEAR_PENDING_EXCEPTION;
1452 // JVMTI has already reported the pending exception
1453 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1454 if (THREAD->is_Java_thread()) {
1455 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1456 }
1457 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1458 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1459 // Throw a java.security.PrivilegedActionException(Exception e) exception
1460 JavaCallArguments args(pending_exception);
1461 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1462 vmSymbols::exception_void_signature(),
1463 &args);
1464 }
1465 }
1466
1467 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1468 return JNIHandles::make_local(env, (oop) result.get_jobject());
1469 JVM_END
1470
1471
1472 // Returns the inherited_access_control_context field of the running thread.
1473 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1474 JVMWrapper("JVM_GetInheritedAccessControlContext");
1475 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1476 return JNIHandles::make_local(env, result);
1477 JVM_END
1478
1479 class RegisterArrayForGC {
1480 private:
1481 JavaThread *_thread;
1482 public:
1483 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1484 _thread = thread;
1485 _thread->register_array_for_gc(array);
1486 }
1487
1488 ~RegisterArrayForGC() {
1489 _thread->register_array_for_gc(NULL);
1490 }
1491 };
1492
1493
1494 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1495 JVMWrapper("JVM_GetStackAccessControlContext");
1496 if (!UsePrivilegedStack) return NULL;
1497
1498 ResourceMark rm(THREAD);
1499 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1500 JvmtiVMObjectAllocEventCollector oam;
1501
1502 // count the protection domains on the execution stack. We collapse
1503 // duplicate consecutive protection domains into a single one, as
1504 // well as stopping when we hit a privileged frame.
1505
1506 // Use vframeStream to iterate through Java frames
1507 vframeStream vfst(thread);
1508
1509 oop previous_protection_domain = NULL;
1510 Handle privileged_context(thread, NULL);
1511 bool is_privileged = false;
1512 oop protection_domain = NULL;
1513
1514 for(; !vfst.at_end(); vfst.next()) {
1515 // get method of frame
1516 Method* method = vfst.method();
1517 intptr_t* frame_id = vfst.frame_id();
1518
1519 // check the privileged frames to see if we have a match
1520 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1521 // this frame is privileged
1522 is_privileged = true;
1523 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1524 protection_domain = thread->privileged_stack_top()->protection_domain();
1525 } else {
1526 protection_domain = method->method_holder()->protection_domain();
1527 }
1528
1529 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) {
1530 local_array->push(protection_domain);
1531 previous_protection_domain = protection_domain;
1532 }
1533
1534 if (is_privileged) break;
1535 }
1536
1537
1538 // either all the domains on the stack were system domains, or
1539 // we had a privileged system domain
1540 if (local_array->is_empty()) {
1541 if (is_privileged && privileged_context.is_null()) return NULL;
1542
1543 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1544 return JNIHandles::make_local(env, result);
1545 }
1546
1547 // the resource area must be registered in case of a gc
1548 RegisterArrayForGC ragc(thread, local_array);
1549 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1550 local_array->length(), CHECK_NULL);
1551 objArrayHandle h_context(thread, context);
1552 for (int index = 0; index < local_array->length(); index++) {
1553 h_context->obj_at_put(index, local_array->at(index));
1554 }
1555
1556 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1557
1558 return JNIHandles::make_local(env, result);
1559 JVM_END
1560
1561
1562 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1563 JVMWrapper("JVM_IsArrayClass");
1564 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1565 return (k != NULL) && k->is_array_klass() ? true : false;
1566 JVM_END
1567
1568
1569 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1570 JVMWrapper("JVM_IsPrimitiveClass");
1571 oop mirror = JNIHandles::resolve_non_null(cls);
1572 return (jboolean) java_lang_Class::is_primitive(mirror);
1573 JVM_END
1574
1575
1576 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1577 JVMWrapper("JVM_GetClassModifiers");
1578 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1579 // Primitive type
1580 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1581 }
1582
1583 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1584 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1585 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1586 return k->modifier_flags();
1587 JVM_END
1588
1589
1590 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1591
1592 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1593 JvmtiVMObjectAllocEventCollector oam;
1594 // ofClass is a reference to a java_lang_Class object. The mirror object
1595 // of an InstanceKlass
1596
1597 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1598 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1599 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1600 return (jobjectArray)JNIHandles::make_local(env, result);
1601 }
1602
1603 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1604 InnerClassesIterator iter(k);
1605
1606 if (iter.length() == 0) {
1607 // Neither an inner nor outer class
1608 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1609 return (jobjectArray)JNIHandles::make_local(env, result);
1610 }
1611
1612 // find inner class info
1613 constantPoolHandle cp(thread, k->constants());
1614 int length = iter.length();
1615
1616 // Allocate temp. result array
1617 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1618 objArrayHandle result (THREAD, r);
1619 int members = 0;
1620
1621 for (; !iter.done(); iter.next()) {
1622 int ioff = iter.inner_class_info_index();
1623 int ooff = iter.outer_class_info_index();
1624
1625 if (ioff != 0 && ooff != 0) {
1626 // Check to see if the name matches the class we're looking for
1627 // before attempting to find the class.
1628 if (cp->klass_name_at_matches(k, ooff)) {
1629 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1630 if (outer_klass == k) {
1631 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1632 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1633
1634 // Throws an exception if outer klass has not declared k as
1635 // an inner klass
1636 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1637
1638 result->obj_at_put(members, inner_klass->java_mirror());
1639 members++;
1640 }
1641 }
1642 }
1643 }
1644
1645 if (members != length) {
1646 // Return array of right length
1647 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1648 for(int i = 0; i < members; i++) {
1649 res->obj_at_put(i, result->obj_at(i));
1650 }
1651 return (jobjectArray)JNIHandles::make_local(env, res);
1652 }
1653
1654 return (jobjectArray)JNIHandles::make_local(env, result());
1655 JVM_END
1656
1657
1658 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1659 {
1660 // ofClass is a reference to a java_lang_Class object.
1661 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1662 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1663 return NULL;
1664 }
1665
1666 bool inner_is_member = false;
1667 Klass* outer_klass
1668 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1669 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1670 if (outer_klass == NULL) return NULL; // already a top-level class
1671 if (!inner_is_member) return NULL; // a nonfindable or unsafe anonymous class (inside a method)
1672 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1673 }
1674 JVM_END
1675
1676 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1677 {
1678 oop mirror = JNIHandles::resolve_non_null(cls);
1679 if (java_lang_Class::is_primitive(mirror) ||
1680 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1681 return NULL;
1682 }
1683 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1684 int ooff = 0, noff = 0;
1685 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1686 if (noff != 0) {
1687 constantPoolHandle i_cp(thread, k->constants());
1688 Symbol* name = i_cp->symbol_at(noff);
1689 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1690 return (jstring) JNIHandles::make_local(env, str());
1691 }
1692 }
1693 return NULL;
1694 }
1695 JVM_END
1696
1697 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1698 assert (cls != NULL, "illegal class");
1699 JVMWrapper("JVM_GetClassSignature");
1700 JvmtiVMObjectAllocEventCollector oam;
1701 ResourceMark rm(THREAD);
1702 // Return null for arrays and primatives
1703 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1704 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1705 if (k->is_instance_klass()) {
1706 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1707 if (sym == NULL) return NULL;
1708 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1709 return (jstring) JNIHandles::make_local(env, str());
1710 }
1711 }
1712 return NULL;
1713 JVM_END
1714
1715
1716 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1717 assert (cls != NULL, "illegal class");
1718 JVMWrapper("JVM_GetClassAnnotations");
1719
1720 // Return null for arrays and primitives
1721 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1722 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1723 if (k->is_instance_klass()) {
1724 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1725 return (jbyteArray) JNIHandles::make_local(env, a);
1726 }
1727 }
1728 return NULL;
1729 JVM_END
1730
1731
1732 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1733 // some of this code was adapted from from jni_FromReflectedField
1734
1735 oop reflected = JNIHandles::resolve_non_null(field);
1736 oop mirror = java_lang_reflect_Field::clazz(reflected);
1737 Klass* k = java_lang_Class::as_Klass(mirror);
1738 int slot = java_lang_reflect_Field::slot(reflected);
1739 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1740
1741 InstanceKlass* ik = InstanceKlass::cast(k);
1742 intptr_t offset = ik->field_offset(slot);
1743
1744 if (modifiers & JVM_ACC_STATIC) {
1745 // for static fields we only look in the current class
1746 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1747 assert(false, "cannot find static field");
1748 return false;
1749 }
1750 } else {
1751 // for instance fields we start with the current class and work
1752 // our way up through the superclass chain
1753 if (!ik->find_field_from_offset(offset, false, &fd)) {
1754 assert(false, "cannot find instance field");
1755 return false;
1756 }
1757 }
1758 return true;
1759 }
1760
1761 static Method* jvm_get_method_common(jobject method) {
1762 // some of this code was adapted from from jni_FromReflectedMethod
1763
1764 oop reflected = JNIHandles::resolve_non_null(method);
1765 oop mirror = NULL;
1766 int slot = 0;
1767
1768 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1769 mirror = java_lang_reflect_Constructor::clazz(reflected);
1770 slot = java_lang_reflect_Constructor::slot(reflected);
1771 } else {
1772 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1773 "wrong type");
1774 mirror = java_lang_reflect_Method::clazz(reflected);
1775 slot = java_lang_reflect_Method::slot(reflected);
1776 }
1777 Klass* k = java_lang_Class::as_Klass(mirror);
1778
1779 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1780 assert(m != NULL, "cannot find method");
1781 return m; // caller has to deal with NULL in product mode
1782 }
1783
1784 /* Type use annotations support (JDK 1.8) */
1785
1786 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1787 assert (cls != NULL, "illegal class");
1788 JVMWrapper("JVM_GetClassTypeAnnotations");
1789 ResourceMark rm(THREAD);
1790 // Return null for arrays and primitives
1791 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1792 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1793 if (k->is_instance_klass()) {
1794 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1795 if (type_annotations != NULL) {
1796 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1797 return (jbyteArray) JNIHandles::make_local(env, a);
1798 }
1799 }
1800 }
1801 return NULL;
1802 JVM_END
1803
1804 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1805 assert (method != NULL, "illegal method");
1806 JVMWrapper("JVM_GetMethodTypeAnnotations");
1807
1808 // method is a handle to a java.lang.reflect.Method object
1809 Method* m = jvm_get_method_common(method);
1810 if (m == NULL) {
1811 return NULL;
1812 }
1813
1814 AnnotationArray* type_annotations = m->type_annotations();
1815 if (type_annotations != NULL) {
1816 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1817 return (jbyteArray) JNIHandles::make_local(env, a);
1818 }
1819
1820 return NULL;
1821 JVM_END
1822
1823 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1824 assert (field != NULL, "illegal field");
1825 JVMWrapper("JVM_GetFieldTypeAnnotations");
1826
1827 fieldDescriptor fd;
1828 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1829 if (!gotFd) {
1830 return NULL;
1831 }
1832
1833 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1834 JVM_END
1835
1836 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1837 if (!cp->is_within_bounds(index)) {
1838 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1839 }
1840 }
1841
1842 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1843 {
1844 JVMWrapper("JVM_GetMethodParameters");
1845 // method is a handle to a java.lang.reflect.Method object
1846 Method* method_ptr = jvm_get_method_common(method);
1847 methodHandle mh (THREAD, method_ptr);
1848 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1849 const int num_params = mh->method_parameters_length();
1850
1851 if (num_params < 0) {
1852 // A -1 return value from method_parameters_length means there is no
1853 // parameter data. Return null to indicate this to the reflection
1854 // API.
1855 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1856 return (jobjectArray)NULL;
1857 } else {
1858 // Otherwise, we return something up to reflection, even if it is
1859 // a zero-length array. Why? Because in some cases this can
1860 // trigger a MalformedParametersException.
1861
1862 // make sure all the symbols are properly formatted
1863 for (int i = 0; i < num_params; i++) {
1864 MethodParametersElement* params = mh->method_parameters_start();
1865 int index = params[i].name_cp_index;
1866 bounds_check(mh->constants(), index, CHECK_NULL);
1867
1868 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1869 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1870 "Wrong type at constant pool index");
1871 }
1872
1873 }
1874
1875 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1876 objArrayHandle result (THREAD, result_oop);
1877
1878 for (int i = 0; i < num_params; i++) {
1879 MethodParametersElement* params = mh->method_parameters_start();
1880 // For a 0 index, give a NULL symbol
1881 Symbol* sym = 0 != params[i].name_cp_index ?
1882 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1883 int flags = params[i].flags;
1884 oop param = Reflection::new_parameter(reflected_method, i, sym,
1885 flags, CHECK_NULL);
1886 result->obj_at_put(i, param);
1887 }
1888 return (jobjectArray)JNIHandles::make_local(env, result());
1889 }
1890 }
1891 JVM_END
1892
1893 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1894
1895 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1896 {
1897 JVMWrapper("JVM_GetClassDeclaredFields");
1898 JvmtiVMObjectAllocEventCollector oam;
1899
1900 // Exclude primitive types and array types
1901 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1902 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1903 // Return empty array
1904 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1905 return (jobjectArray) JNIHandles::make_local(env, res);
1906 }
1907
1908 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1909 constantPoolHandle cp(THREAD, k->constants());
1910
1911 // Ensure class is linked
1912 k->link_class(CHECK_NULL);
1913
1914 // Allocate result
1915 int num_fields;
1916
1917 if (publicOnly) {
1918 num_fields = 0;
1919 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1920 if (fs.access_flags().is_public()) ++num_fields;
1921 }
1922 } else {
1923 num_fields = k->java_fields_count();
1924 }
1925
1926 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1927 objArrayHandle result (THREAD, r);
1928
1929 int out_idx = 0;
1930 fieldDescriptor fd;
1931 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1932 if (!publicOnly || fs.access_flags().is_public()) {
1933 fd.reinitialize(k, fs.index());
1934 oop field = Reflection::new_field(&fd, CHECK_NULL);
1935 result->obj_at_put(out_idx, field);
1936 ++out_idx;
1937 }
1938 }
1939 assert(out_idx == num_fields, "just checking");
1940 return (jobjectArray) JNIHandles::make_local(env, result());
1941 }
1942 JVM_END
1943
1944 static bool select_method(const methodHandle& method, bool want_constructor) {
1945 if (want_constructor) {
1946 return (method->is_initializer() && !method->is_static());
1947 } else {
1948 return (!method->is_initializer() && !method->is_overpass());
1949 }
1950 }
1951
1952 static jobjectArray get_class_declared_methods_helper(
1953 JNIEnv *env,
1954 jclass ofClass, jboolean publicOnly,
1955 bool want_constructor,
1956 Klass* klass, TRAPS) {
1957
1958 JvmtiVMObjectAllocEventCollector oam;
1959
1960 // Exclude primitive types and array types
1961 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1962 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1963 // Return empty array
1964 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1965 return (jobjectArray) JNIHandles::make_local(env, res);
1966 }
1967
1968 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1969
1970 // Ensure class is linked
1971 k->link_class(CHECK_NULL);
1972
1973 Array<Method*>* methods = k->methods();
1974 int methods_length = methods->length();
1975
1976 // Save original method_idnum in case of redefinition, which can change
1977 // the idnum of obsolete methods. The new method will have the same idnum
1978 // but if we refresh the methods array, the counts will be wrong.
1979 ResourceMark rm(THREAD);
1980 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1981 int num_methods = 0;
1982
1983 for (int i = 0; i < methods_length; i++) {
1984 methodHandle method(THREAD, methods->at(i));
1985 if (select_method(method, want_constructor)) {
1986 if (!publicOnly || method->is_public()) {
1987 idnums->push(method->method_idnum());
1988 ++num_methods;
1989 }
1990 }
1991 }
1992
1993 // Allocate result
1994 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1995 objArrayHandle result (THREAD, r);
1996
1997 // Now just put the methods that we selected above, but go by their idnum
1998 // in case of redefinition. The methods can be redefined at any safepoint,
1999 // so above when allocating the oop array and below when creating reflect
2000 // objects.
2001 for (int i = 0; i < num_methods; i++) {
2002 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
2003 if (method.is_null()) {
2004 // Method may have been deleted and seems this API can handle null
2005 // Otherwise should probably put a method that throws NSME
2006 result->obj_at_put(i, NULL);
2007 } else {
2008 oop m;
2009 if (want_constructor) {
2010 m = Reflection::new_constructor(method, CHECK_NULL);
2011 } else {
2012 m = Reflection::new_method(method, false, CHECK_NULL);
2013 }
2014 result->obj_at_put(i, m);
2015 }
2016 }
2017
2018 return (jobjectArray) JNIHandles::make_local(env, result());
2019 }
2020
2021 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2022 {
2023 JVMWrapper("JVM_GetClassDeclaredMethods");
2024 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2025 /*want_constructor*/ false,
2026 SystemDictionary::reflect_Method_klass(), THREAD);
2027 }
2028 JVM_END
2029
2030 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2031 {
2032 JVMWrapper("JVM_GetClassDeclaredConstructors");
2033 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2034 /*want_constructor*/ true,
2035 SystemDictionary::reflect_Constructor_klass(), THREAD);
2036 }
2037 JVM_END
2038
2039 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
2040 {
2041 JVMWrapper("JVM_GetClassAccessFlags");
2042 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2043 // Primitive type
2044 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
2045 }
2046
2047 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2048 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
2049 }
2050 JVM_END
2051
2052 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
2053 {
2054 JVMWrapper("JVM_AreNestMates");
2055 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2056 assert(c->is_instance_klass(), "must be");
2057 InstanceKlass* ck = InstanceKlass::cast(c);
2058 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2059 assert(m->is_instance_klass(), "must be");
2060 InstanceKlass* mk = InstanceKlass::cast(m);
2061 return ck->has_nestmate_access_to(mk, THREAD);
2062 }
2063 JVM_END
2064
2065 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2066 {
2067 // current is not a primitive or array class
2068 JVMWrapper("JVM_GetNestHost");
2069 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2070 assert(c->is_instance_klass(), "must be");
2071 InstanceKlass* ck = InstanceKlass::cast(c);
2072 // Don't post exceptions if validation fails
2073 InstanceKlass* host = ck->nest_host(NULL, THREAD);
2074 return (jclass) (host == NULL ? NULL :
2075 JNIHandles::make_local(THREAD, host->java_mirror()));
2076 }
2077 JVM_END
2078
2079 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2080 {
2081 // current is not a primitive or array class
2082 JVMWrapper("JVM_GetNestMembers");
2083 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2084 assert(c->is_instance_klass(), "must be");
2085 InstanceKlass* ck = InstanceKlass::cast(c);
2086 // Get the nest host for this nest - throw ICCE if validation fails
2087 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
2088 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
2089
2090 {
2091 JvmtiVMObjectAllocEventCollector oam;
2092 Array<u2>* members = host->nest_members();
2093 int length = members == NULL ? 0 : members->length();
2094 // nest host is first in the array so make it one bigger
2095 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2096 length + 1, CHECK_NULL);
2097 objArrayHandle result (THREAD, r);
2098 result->obj_at_put(0, host->java_mirror());
2099 if (length != 0) {
2100 int i;
2101 for (i = 0; i < length; i++) {
2102 int cp_index = members->at(i);
2103 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
2104 if (k->is_instance_klass()) {
2105 InstanceKlass* nest_host_k =
2106 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
2107 if (nest_host_k == host) {
2108 result->obj_at_put(i+1, k->java_mirror());
2109 }
2110 else {
2111 // k's nest host is legal but it isn't our host so
2112 // throw ICCE
2113 ResourceMark rm(THREAD);
2114 Exceptions::fthrow(THREAD_AND_LOCATION,
2115 icce,
2116 "%s.getNestMembers: Nest member %s in %s declares a different nest host of %s",
2117 c->external_name(),
2118 k->external_name(),
2119 host->external_name(),
2120 nest_host_k->external_name()
2121 );
2122 return NULL;
2123 }
2124 }
2125 else {
2126 // we have a bad nest member entry - throw ICCE
2127 ResourceMark rm(THREAD);
2128 Exceptions::fthrow(THREAD_AND_LOCATION,
2129 icce,
2130 "Class %s can not be a nest member of %s",
2131 k->external_name(),
2132 host->external_name()
2133 );
2134 return NULL;
2135 }
2136 }
2137 }
2138 else {
2139 assert(host == ck, "must be singleton nest");
2140 }
2141 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2142 }
2143 }
2144 JVM_END
2145
2146 // Constant pool access //////////////////////////////////////////////////////////
2147
2148 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2149 {
2150 JVMWrapper("JVM_GetClassConstantPool");
2151 JvmtiVMObjectAllocEventCollector oam;
2152
2153 // Return null for primitives and arrays
2154 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2155 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2156 if (k->is_instance_klass()) {
2157 InstanceKlass* k_h = InstanceKlass::cast(k);
2158 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2159 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2160 return JNIHandles::make_local(jcp());
2161 }
2162 }
2163 return NULL;
2164 }
2165 JVM_END
2166
2167
2168 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2169 {
2170 JVMWrapper("JVM_ConstantPoolGetSize");
2171 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2172 return cp->length();
2173 }
2174 JVM_END
2175
2176
2177 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2178 {
2179 JVMWrapper("JVM_ConstantPoolGetClassAt");
2180 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2181 bounds_check(cp, index, CHECK_NULL);
2182 constantTag tag = cp->tag_at(index);
2183 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2184 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2185 }
2186 Klass* k = cp->klass_at(index, CHECK_NULL);
2187 return (jclass) JNIHandles::make_local(k->java_mirror());
2188 }
2189 JVM_END
2190
2191 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2192 {
2193 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2194 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2195 bounds_check(cp, index, CHECK_NULL);
2196 constantTag tag = cp->tag_at(index);
2197 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2198 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2199 }
2200 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2201 if (k == NULL) return NULL;
2202 return (jclass) JNIHandles::make_local(k->java_mirror());
2203 }
2204 JVM_END
2205
2206 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2207 constantTag tag = cp->tag_at(index);
2208 if (!tag.is_method() && !tag.is_interface_method()) {
2209 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2210 }
2211 int klass_ref = cp->uncached_klass_ref_index_at(index);
2212 Klass* k_o;
2213 if (force_resolution) {
2214 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2215 } else {
2216 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2217 if (k_o == NULL) return NULL;
2218 }
2219 InstanceKlass* k = InstanceKlass::cast(k_o);
2220 Symbol* name = cp->uncached_name_ref_at(index);
2221 Symbol* sig = cp->uncached_signature_ref_at(index);
2222 methodHandle m (THREAD, k->find_method(name, sig));
2223 if (m.is_null()) {
2224 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2225 }
2226 oop method;
2227 if (!m->is_initializer() || m->is_static()) {
2228 method = Reflection::new_method(m, true, CHECK_NULL);
2229 } else {
2230 method = Reflection::new_constructor(m, CHECK_NULL);
2231 }
2232 return JNIHandles::make_local(method);
2233 }
2234
2235 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2236 {
2237 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2238 JvmtiVMObjectAllocEventCollector oam;
2239 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2240 bounds_check(cp, index, CHECK_NULL);
2241 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2242 return res;
2243 }
2244 JVM_END
2245
2246 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2247 {
2248 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2249 JvmtiVMObjectAllocEventCollector oam;
2250 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2251 bounds_check(cp, index, CHECK_NULL);
2252 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2253 return res;
2254 }
2255 JVM_END
2256
2257 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2258 constantTag tag = cp->tag_at(index);
2259 if (!tag.is_field()) {
2260 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2261 }
2262 int klass_ref = cp->uncached_klass_ref_index_at(index);
2263 Klass* k_o;
2264 if (force_resolution) {
2265 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2266 } else {
2267 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2268 if (k_o == NULL) return NULL;
2269 }
2270 InstanceKlass* k = InstanceKlass::cast(k_o);
2271 Symbol* name = cp->uncached_name_ref_at(index);
2272 Symbol* sig = cp->uncached_signature_ref_at(index);
2273 fieldDescriptor fd;
2274 Klass* target_klass = k->find_field(name, sig, &fd);
2275 if (target_klass == NULL) {
2276 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2277 }
2278 oop field = Reflection::new_field(&fd, CHECK_NULL);
2279 return JNIHandles::make_local(field);
2280 }
2281
2282 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2283 {
2284 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2285 JvmtiVMObjectAllocEventCollector oam;
2286 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2287 bounds_check(cp, index, CHECK_NULL);
2288 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2289 return res;
2290 }
2291 JVM_END
2292
2293 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2294 {
2295 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2296 JvmtiVMObjectAllocEventCollector oam;
2297 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2298 bounds_check(cp, index, CHECK_NULL);
2299 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2300 return res;
2301 }
2302 JVM_END
2303
2304 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2305 {
2306 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2307 JvmtiVMObjectAllocEventCollector oam;
2308 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2309 bounds_check(cp, index, CHECK_NULL);
2310 constantTag tag = cp->tag_at(index);
2311 if (!tag.is_field_or_method()) {
2312 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2313 }
2314 int klass_ref = cp->uncached_klass_ref_index_at(index);
2315 Symbol* klass_name = cp->klass_name_at(klass_ref);
2316 Symbol* member_name = cp->uncached_name_ref_at(index);
2317 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2318 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2319 objArrayHandle dest(THREAD, dest_o);
2320 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2321 dest->obj_at_put(0, str());
2322 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2323 dest->obj_at_put(1, str());
2324 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2325 dest->obj_at_put(2, str());
2326 return (jobjectArray) JNIHandles::make_local(dest());
2327 }
2328 JVM_END
2329
2330 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2331 {
2332 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2333 JvmtiVMObjectAllocEventCollector oam;
2334 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2335 bounds_check(cp, index, CHECK_0);
2336 constantTag tag = cp->tag_at(index);
2337 if (!tag.is_field_or_method()) {
2338 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2339 }
2340 return (jint) cp->uncached_klass_ref_index_at(index);
2341 }
2342 JVM_END
2343
2344 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2345 {
2346 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2347 JvmtiVMObjectAllocEventCollector oam;
2348 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2349 bounds_check(cp, index, CHECK_0);
2350 constantTag tag = cp->tag_at(index);
2351 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2352 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2353 }
2354 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2355 }
2356 JVM_END
2357
2358 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2359 {
2360 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2361 JvmtiVMObjectAllocEventCollector oam;
2362 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2363 bounds_check(cp, index, CHECK_NULL);
2364 constantTag tag = cp->tag_at(index);
2365 if (!tag.is_name_and_type()) {
2366 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2367 }
2368 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2369 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2370 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2371 objArrayHandle dest(THREAD, dest_o);
2372 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2373 dest->obj_at_put(0, str());
2374 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2375 dest->obj_at_put(1, str());
2376 return (jobjectArray) JNIHandles::make_local(dest());
2377 }
2378 JVM_END
2379
2380 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2381 {
2382 JVMWrapper("JVM_ConstantPoolGetIntAt");
2383 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2384 bounds_check(cp, index, CHECK_0);
2385 constantTag tag = cp->tag_at(index);
2386 if (!tag.is_int()) {
2387 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2388 }
2389 return cp->int_at(index);
2390 }
2391 JVM_END
2392
2393 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2394 {
2395 JVMWrapper("JVM_ConstantPoolGetLongAt");
2396 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2397 bounds_check(cp, index, CHECK_(0L));
2398 constantTag tag = cp->tag_at(index);
2399 if (!tag.is_long()) {
2400 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2401 }
2402 return cp->long_at(index);
2403 }
2404 JVM_END
2405
2406 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2407 {
2408 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2409 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2410 bounds_check(cp, index, CHECK_(0.0f));
2411 constantTag tag = cp->tag_at(index);
2412 if (!tag.is_float()) {
2413 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2414 }
2415 return cp->float_at(index);
2416 }
2417 JVM_END
2418
2419 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2420 {
2421 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2422 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2423 bounds_check(cp, index, CHECK_(0.0));
2424 constantTag tag = cp->tag_at(index);
2425 if (!tag.is_double()) {
2426 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2427 }
2428 return cp->double_at(index);
2429 }
2430 JVM_END
2431
2432 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2433 {
2434 JVMWrapper("JVM_ConstantPoolGetStringAt");
2435 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2436 bounds_check(cp, index, CHECK_NULL);
2437 constantTag tag = cp->tag_at(index);
2438 if (!tag.is_string()) {
2439 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2440 }
2441 oop str = cp->string_at(index, CHECK_NULL);
2442 return (jstring) JNIHandles::make_local(str);
2443 }
2444 JVM_END
2445
2446 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2447 {
2448 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2449 JvmtiVMObjectAllocEventCollector oam;
2450 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2451 bounds_check(cp, index, CHECK_NULL);
2452 constantTag tag = cp->tag_at(index);
2453 if (!tag.is_symbol()) {
2454 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2455 }
2456 Symbol* sym = cp->symbol_at(index);
2457 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2458 return (jstring) JNIHandles::make_local(str());
2459 }
2460 JVM_END
2461
2462 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2463 {
2464 JVMWrapper("JVM_ConstantPoolGetTagAt");
2465 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2466 bounds_check(cp, index, CHECK_0);
2467 constantTag tag = cp->tag_at(index);
2468 jbyte result = tag.value();
2469 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2470 // they are changed to the corresponding tags from the JVM spec, so that java code in
2471 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2472 if (tag.is_klass_or_reference()) {
2473 result = JVM_CONSTANT_Class;
2474 } else if (tag.is_string_index()) {
2475 result = JVM_CONSTANT_String;
2476 } else if (tag.is_method_type_in_error()) {
2477 result = JVM_CONSTANT_MethodType;
2478 } else if (tag.is_method_handle_in_error()) {
2479 result = JVM_CONSTANT_MethodHandle;
2480 } else if (tag.is_dynamic_constant_in_error()) {
2481 result = JVM_CONSTANT_Dynamic;
2482 }
2483 return result;
2484 }
2485 JVM_END
2486
2487 // Assertion support. //////////////////////////////////////////////////////////
2488
2489 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2490 JVMWrapper("JVM_DesiredAssertionStatus");
2491 assert(cls != NULL, "bad class");
2492
2493 oop r = JNIHandles::resolve(cls);
2494 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2495 if (java_lang_Class::is_primitive(r)) return false;
2496
2497 Klass* k = java_lang_Class::as_Klass(r);
2498 assert(k->is_instance_klass(), "must be an instance klass");
2499 if (!k->is_instance_klass()) return false;
2500
2501 ResourceMark rm(THREAD);
2502 const char* name = k->name()->as_C_string();
2503 bool system_class = k->class_loader() == NULL;
2504 return JavaAssertions::enabled(name, system_class);
2505
2506 JVM_END
2507
2508
2509 // Return a new AssertionStatusDirectives object with the fields filled in with
2510 // command-line assertion arguments (i.e., -ea, -da).
2511 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2512 JVMWrapper("JVM_AssertionStatusDirectives");
2513 JvmtiVMObjectAllocEventCollector oam;
2514 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2515 return JNIHandles::make_local(env, asd);
2516 JVM_END
2517
2518 // Verification ////////////////////////////////////////////////////////////////////////////////
2519
2520 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2521
2522 // RedefineClasses support: bug 6214132 caused verification to fail.
2523 // All functions from this section should call the jvmtiThreadSate function:
2524 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2525 // The function returns a Klass* of the _scratch_class if the verifier
2526 // was invoked in the middle of the class redefinition.
2527 // Otherwise it returns its argument value which is the _the_class Klass*.
2528 // Please, refer to the description in the jvmtiThreadSate.hpp.
2529
2530 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2531 JVMWrapper("JVM_GetClassNameUTF");
2532 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2533 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2534 return k->name()->as_utf8();
2535 JVM_END
2536
2537
2538 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2539 JVMWrapper("JVM_GetClassCPTypes");
2540 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2541 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2542 // types will have length zero if this is not an InstanceKlass
2543 // (length is determined by call to JVM_GetClassCPEntriesCount)
2544 if (k->is_instance_klass()) {
2545 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2546 for (int index = cp->length() - 1; index >= 0; index--) {
2547 constantTag tag = cp->tag_at(index);
2548 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2549 }
2550 }
2551 JVM_END
2552
2553
2554 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2555 JVMWrapper("JVM_GetClassCPEntriesCount");
2556 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2557 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2558 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2559 JVM_END
2560
2561
2562 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2563 JVMWrapper("JVM_GetClassFieldsCount");
2564 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2565 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2566 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2567 JVM_END
2568
2569
2570 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2571 JVMWrapper("JVM_GetClassMethodsCount");
2572 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2573 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2574 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2575 JVM_END
2576
2577
2578 // The following methods, used for the verifier, are never called with
2579 // array klasses, so a direct cast to InstanceKlass is safe.
2580 // Typically, these methods are called in a loop with bounds determined
2581 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2582 // zero for arrays.
2583 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2584 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2585 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2586 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2587 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2588 int length = method->checked_exceptions_length();
2589 if (length > 0) {
2590 CheckedExceptionElement* table= method->checked_exceptions_start();
2591 for (int i = 0; i < length; i++) {
2592 exceptions[i] = table[i].class_cp_index;
2593 }
2594 }
2595 JVM_END
2596
2597
2598 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2599 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2600 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2601 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2602 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2603 return method->checked_exceptions_length();
2604 JVM_END
2605
2606
2607 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2608 JVMWrapper("JVM_GetMethodIxByteCode");
2609 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2610 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2611 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2612 memcpy(code, method->code_base(), method->code_size());
2613 JVM_END
2614
2615
2616 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2617 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2618 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2619 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2620 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2621 return method->code_size();
2622 JVM_END
2623
2624
2625 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2626 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
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 ExceptionTable extable(method);
2631 entry->start_pc = extable.start_pc(entry_index);
2632 entry->end_pc = extable.end_pc(entry_index);
2633 entry->handler_pc = extable.handler_pc(entry_index);
2634 entry->catchType = extable.catch_type_index(entry_index);
2635 JVM_END
2636
2637
2638 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2639 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2640 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2641 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2642 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2643 return method->exception_table_length();
2644 JVM_END
2645
2646
2647 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2648 JVMWrapper("JVM_GetMethodIxModifiers");
2649 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2650 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2651 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2652 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2653 JVM_END
2654
2655
2656 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2657 JVMWrapper("JVM_GetFieldIxModifiers");
2658 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2659 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2660 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2661 JVM_END
2662
2663
2664 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2665 JVMWrapper("JVM_GetMethodIxLocalsCount");
2666 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2667 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2668 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2669 return method->max_locals();
2670 JVM_END
2671
2672
2673 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2674 JVMWrapper("JVM_GetMethodIxArgsSize");
2675 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2676 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2677 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2678 return method->size_of_parameters();
2679 JVM_END
2680
2681
2682 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2683 JVMWrapper("JVM_GetMethodIxMaxStack");
2684 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2685 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2686 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2687 return method->verifier_max_stack();
2688 JVM_END
2689
2690
2691 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2692 JVMWrapper("JVM_IsConstructorIx");
2693 ResourceMark rm(THREAD);
2694 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2695 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2696 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2697 return method->name() == vmSymbols::object_initializer_name();
2698 JVM_END
2699
2700
2701 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2702 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2703 ResourceMark rm(THREAD);
2704 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2705 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2706 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2707 return method->is_overpass();
2708 JVM_END
2709
2710 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2711 JVMWrapper("JVM_GetMethodIxIxUTF");
2712 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2713 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2714 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2715 return method->name()->as_utf8();
2716 JVM_END
2717
2718
2719 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2720 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2721 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2722 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2723 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2724 return method->signature()->as_utf8();
2725 JVM_END
2726
2727 /**
2728 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2729 * read entries in the constant pool. Since the old verifier always
2730 * works on a copy of the code, it will not see any rewriting that
2731 * may possibly occur in the middle of verification. So it is important
2732 * that nothing it calls tries to use the cpCache instead of the raw
2733 * constant pool, so we must use cp->uncached_x methods when appropriate.
2734 */
2735 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2736 JVMWrapper("JVM_GetCPFieldNameUTF");
2737 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2738 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2739 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2740 switch (cp->tag_at(cp_index).value()) {
2741 case JVM_CONSTANT_Fieldref:
2742 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2743 default:
2744 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2745 }
2746 ShouldNotReachHere();
2747 return NULL;
2748 JVM_END
2749
2750
2751 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2752 JVMWrapper("JVM_GetCPMethodNameUTF");
2753 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2754 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2755 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2756 switch (cp->tag_at(cp_index).value()) {
2757 case JVM_CONSTANT_InterfaceMethodref:
2758 case JVM_CONSTANT_Methodref:
2759 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2760 default:
2761 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2762 }
2763 ShouldNotReachHere();
2764 return NULL;
2765 JVM_END
2766
2767
2768 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2769 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2770 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2771 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2772 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2773 switch (cp->tag_at(cp_index).value()) {
2774 case JVM_CONSTANT_InterfaceMethodref:
2775 case JVM_CONSTANT_Methodref:
2776 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2777 default:
2778 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2779 }
2780 ShouldNotReachHere();
2781 return NULL;
2782 JVM_END
2783
2784
2785 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2786 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2787 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2788 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2789 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2790 switch (cp->tag_at(cp_index).value()) {
2791 case JVM_CONSTANT_Fieldref:
2792 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2793 default:
2794 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2795 }
2796 ShouldNotReachHere();
2797 return NULL;
2798 JVM_END
2799
2800
2801 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2802 JVMWrapper("JVM_GetCPClassNameUTF");
2803 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2804 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2805 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2806 Symbol* classname = cp->klass_name_at(cp_index);
2807 return classname->as_utf8();
2808 JVM_END
2809
2810
2811 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2812 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2813 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2814 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2815 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2816 switch (cp->tag_at(cp_index).value()) {
2817 case JVM_CONSTANT_Fieldref: {
2818 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2819 Symbol* classname = cp->klass_name_at(class_index);
2820 return classname->as_utf8();
2821 }
2822 default:
2823 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2824 }
2825 ShouldNotReachHere();
2826 return NULL;
2827 JVM_END
2828
2829
2830 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2831 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2832 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2833 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2834 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2835 switch (cp->tag_at(cp_index).value()) {
2836 case JVM_CONSTANT_Methodref:
2837 case JVM_CONSTANT_InterfaceMethodref: {
2838 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2839 Symbol* classname = cp->klass_name_at(class_index);
2840 return classname->as_utf8();
2841 }
2842 default:
2843 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2844 }
2845 ShouldNotReachHere();
2846 return NULL;
2847 JVM_END
2848
2849
2850 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2851 JVMWrapper("JVM_GetCPFieldModifiers");
2852 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2853 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2854 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2855 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2856 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2857 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2858 switch (cp->tag_at(cp_index).value()) {
2859 case JVM_CONSTANT_Fieldref: {
2860 Symbol* name = cp->uncached_name_ref_at(cp_index);
2861 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2862 InstanceKlass* ik = InstanceKlass::cast(k_called);
2863 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2864 if (fs.name() == name && fs.signature() == signature) {
2865 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2866 }
2867 }
2868 return -1;
2869 }
2870 default:
2871 fatal("JVM_GetCPFieldModifiers: illegal constant");
2872 }
2873 ShouldNotReachHere();
2874 return 0;
2875 JVM_END
2876
2877
2878 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2879 JVMWrapper("JVM_GetCPMethodModifiers");
2880 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2881 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2882 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2883 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2884 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2885 switch (cp->tag_at(cp_index).value()) {
2886 case JVM_CONSTANT_Methodref:
2887 case JVM_CONSTANT_InterfaceMethodref: {
2888 Symbol* name = cp->uncached_name_ref_at(cp_index);
2889 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2890 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2891 int methods_count = methods->length();
2892 for (int i = 0; i < methods_count; i++) {
2893 Method* method = methods->at(i);
2894 if (method->name() == name && method->signature() == signature) {
2895 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2896 }
2897 }
2898 return -1;
2899 }
2900 default:
2901 fatal("JVM_GetCPMethodModifiers: illegal constant");
2902 }
2903 ShouldNotReachHere();
2904 return 0;
2905 JVM_END
2906
2907
2908 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2909
2910 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2911 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2912 JVM_END
2913
2914
2915 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2916 JVMWrapper("JVM_IsSameClassPackage");
2917 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2918 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2919 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2920 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2921 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2922 JVM_END
2923
2924 // Printing support //////////////////////////////////////////////////
2925 extern "C" {
2926
2927 ATTRIBUTE_PRINTF(3, 0)
2928 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2929 // Reject count values that are negative signed values converted to
2930 // unsigned; see bug 4399518, 4417214
2931 if ((intptr_t)count <= 0) return -1;
2932
2933 int result = os::vsnprintf(str, count, fmt, args);
2934 if (result > 0 && (size_t)result >= count) {
2935 result = -1;
2936 }
2937
2938 return result;
2939 }
2940
2941 ATTRIBUTE_PRINTF(3, 4)
2942 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2943 va_list args;
2944 int len;
2945 va_start(args, fmt);
2946 len = jio_vsnprintf(str, count, fmt, args);
2947 va_end(args);
2948 return len;
2949 }
2950
2951 ATTRIBUTE_PRINTF(2, 3)
2952 int jio_fprintf(FILE* f, const char *fmt, ...) {
2953 int len;
2954 va_list args;
2955 va_start(args, fmt);
2956 len = jio_vfprintf(f, fmt, args);
2957 va_end(args);
2958 return len;
2959 }
2960
2961 ATTRIBUTE_PRINTF(2, 0)
2962 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2963 if (Arguments::vfprintf_hook() != NULL) {
2964 return Arguments::vfprintf_hook()(f, fmt, args);
2965 } else {
2966 return vfprintf(f, fmt, args);
2967 }
2968 }
2969
2970 ATTRIBUTE_PRINTF(1, 2)
2971 JNIEXPORT int jio_printf(const char *fmt, ...) {
2972 int len;
2973 va_list args;
2974 va_start(args, fmt);
2975 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2976 va_end(args);
2977 return len;
2978 }
2979
2980 // HotSpot specific jio method
2981 void jio_print(const char* s, size_t len) {
2982 // Try to make this function as atomic as possible.
2983 if (Arguments::vfprintf_hook() != NULL) {
2984 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2985 } else {
2986 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2987 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2988 }
2989 }
2990
2991 } // Extern C
2992
2993 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2994
2995 // In most of the JVM thread support functions we need to access the
2996 // thread through a ThreadsListHandle to prevent it from exiting and
2997 // being reclaimed while we try to operate on it. The exceptions to this
2998 // rule are when operating on the current thread, or if the monitor of
2999 // the target java.lang.Thread is locked at the Java level - in both
3000 // cases the target cannot exit.
3001
3002 static void thread_entry(JavaThread* thread, TRAPS) {
3003 HandleMark hm(THREAD);
3004 Handle obj(THREAD, thread->threadObj());
3005 JavaValue result(T_VOID);
3006 JavaCalls::call_virtual(&result,
3007 obj,
3008 SystemDictionary::Thread_klass(),
3009 vmSymbols::run_method_name(),
3010 vmSymbols::void_method_signature(),
3011 THREAD);
3012 }
3013
3014
3015 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3016 JVMWrapper("JVM_StartThread");
3017 JavaThread *native_thread = NULL;
3018
3019 // We cannot hold the Threads_lock when we throw an exception,
3020 // due to rank ordering issues. Example: we might need to grab the
3021 // Heap_lock while we construct the exception.
3022 bool throw_illegal_thread_state = false;
3023
3024 // We must release the Threads_lock before we can post a jvmti event
3025 // in Thread::start.
3026 {
3027 // Ensure that the C++ Thread and OSThread structures aren't freed before
3028 // we operate.
3029 MutexLocker mu(Threads_lock);
3030
3031 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3032 // re-starting an already started thread, so we should usually find
3033 // that the JavaThread is null. However for a JNI attached thread
3034 // there is a small window between the Thread object being created
3035 // (with its JavaThread set) and the update to its threadStatus, so we
3036 // have to check for this
3037 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
3038 throw_illegal_thread_state = true;
3039 } else {
3040 // We could also check the stillborn flag to see if this thread was already stopped, but
3041 // for historical reasons we let the thread detect that itself when it starts running
3042
3043 jlong size =
3044 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3045 // Allocate the C++ Thread structure and create the native thread. The
3046 // stack size retrieved from java is 64-bit signed, but the constructor takes
3047 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3048 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3049 // - Avoid passing negative values which would result in really large stacks.
3050 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3051 size_t sz = size > 0 ? (size_t) size : 0;
3052 native_thread = new JavaThread(&thread_entry, sz);
3053
3054 // At this point it may be possible that no osthread was created for the
3055 // JavaThread due to lack of memory. Check for this situation and throw
3056 // an exception if necessary. Eventually we may want to change this so
3057 // that we only grab the lock if the thread was created successfully -
3058 // then we can also do this check and throw the exception in the
3059 // JavaThread constructor.
3060 if (native_thread->osthread() != NULL) {
3061 // Note: the current thread is not being used within "prepare".
3062 native_thread->prepare(jthread);
3063 }
3064 }
3065 }
3066
3067 if (throw_illegal_thread_state) {
3068 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3069 }
3070
3071 assert(native_thread != NULL, "Starting null thread?");
3072
3073 if (native_thread->osthread() == NULL) {
3074 // No one should hold a reference to the 'native_thread'.
3075 native_thread->smr_delete();
3076 if (JvmtiExport::should_post_resource_exhausted()) {
3077 JvmtiExport::post_resource_exhausted(
3078 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3079 os::native_thread_creation_failed_msg());
3080 }
3081 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3082 os::native_thread_creation_failed_msg());
3083 }
3084
3085 Thread::start(native_thread);
3086
3087 JVM_END
3088
3089
3090 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3091 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
3092 // but is thought to be reliable and simple. In the case, where the receiver is the
3093 // same thread as the sender, no VM_Operation is needed.
3094 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3095 JVMWrapper("JVM_StopThread");
3096
3097 // A nested ThreadsListHandle will grab the Threads_lock so create
3098 // tlh before we resolve throwable.
3099 ThreadsListHandle tlh(thread);
3100 oop java_throwable = JNIHandles::resolve(throwable);
3101 if (java_throwable == NULL) {
3102 THROW(vmSymbols::java_lang_NullPointerException());
3103 }
3104 oop java_thread = NULL;
3105 JavaThread* receiver = NULL;
3106 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3107 Events::log_exception(thread,
3108 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3109 p2i(receiver), p2i((address)java_thread), p2i(throwable));
3110
3111 if (is_alive) {
3112 // jthread refers to a live JavaThread.
3113 if (thread == receiver) {
3114 // Exception is getting thrown at self so no VM_Operation needed.
3115 THROW_OOP(java_throwable);
3116 } else {
3117 // Use a VM_Operation to throw the exception.
3118 Thread::send_async_exception(java_thread, java_throwable);
3119 }
3120 } else {
3121 // Either:
3122 // - target thread has not been started before being stopped, or
3123 // - target thread already terminated
3124 // We could read the threadStatus to determine which case it is
3125 // but that is overkill as it doesn't matter. We must set the
3126 // stillborn flag for the first case, and if the thread has already
3127 // exited setting this flag has no effect.
3128 java_lang_Thread::set_stillborn(java_thread);
3129 }
3130 JVM_END
3131
3132
3133 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3134 JVMWrapper("JVM_IsThreadAlive");
3135
3136 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3137 return java_lang_Thread::is_alive(thread_oop);
3138 JVM_END
3139
3140
3141 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3142 JVMWrapper("JVM_SuspendThread");
3143
3144 ThreadsListHandle tlh(thread);
3145 JavaThread* receiver = NULL;
3146 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3147 if (is_alive) {
3148 // jthread refers to a live JavaThread.
3149 {
3150 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3151 if (receiver->is_external_suspend()) {
3152 // Don't allow nested external suspend requests. We can't return
3153 // an error from this interface so just ignore the problem.
3154 return;
3155 }
3156 if (receiver->is_exiting()) { // thread is in the process of exiting
3157 return;
3158 }
3159 receiver->set_external_suspend();
3160 }
3161
3162 // java_suspend() will catch threads in the process of exiting
3163 // and will ignore them.
3164 receiver->java_suspend();
3165
3166 // It would be nice to have the following assertion in all the
3167 // time, but it is possible for a racing resume request to have
3168 // resumed this thread right after we suspended it. Temporarily
3169 // enable this assertion if you are chasing a different kind of
3170 // bug.
3171 //
3172 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3173 // receiver->is_being_ext_suspended(), "thread is not suspended");
3174 }
3175 JVM_END
3176
3177
3178 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3179 JVMWrapper("JVM_ResumeThread");
3180
3181 ThreadsListHandle tlh(thread);
3182 JavaThread* receiver = NULL;
3183 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3184 if (is_alive) {
3185 // jthread refers to a live JavaThread.
3186
3187 // This is the original comment for this Threads_lock grab:
3188 // We need to *always* get the threads lock here, since this operation cannot be allowed during
3189 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3190 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3191 // looks at it.
3192 //
3193 // The above comment dates back to when we had both internal and
3194 // external suspend APIs that shared a common underlying mechanism.
3195 // External suspend is now entirely cooperative and doesn't share
3196 // anything with internal suspend. That said, there are some
3197 // assumptions in the VM that an external resume grabs the
3198 // Threads_lock. We can't drop the Threads_lock grab here until we
3199 // resolve the assumptions that exist elsewhere.
3200 //
3201 MutexLocker ml(Threads_lock);
3202 receiver->java_resume();
3203 }
3204 JVM_END
3205
3206
3207 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3208 JVMWrapper("JVM_SetThreadPriority");
3209
3210 ThreadsListHandle tlh(thread);
3211 oop java_thread = NULL;
3212 JavaThread* receiver = NULL;
3213 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3214 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3215
3216 if (is_alive) {
3217 // jthread refers to a live JavaThread.
3218 Thread::set_priority(receiver, (ThreadPriority)prio);
3219 }
3220 // Implied else: If the JavaThread hasn't started yet, then the
3221 // priority set in the java.lang.Thread object above will be pushed
3222 // down when it does start.
3223 JVM_END
3224
3225
3226 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3227 JVMWrapper("JVM_Yield");
3228 if (os::dont_yield()) return;
3229 HOTSPOT_THREAD_YIELD();
3230 os::naked_yield();
3231 JVM_END
3232
3233 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3234 assert(event != NULL, "invariant");
3235 assert(event->should_commit(), "invariant");
3236 event->set_time(millis);
3237 event->commit();
3238 }
3239
3240 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3241 JVMWrapper("JVM_Sleep");
3242
3243 if (millis < 0) {
3244 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3245 }
3246
3247 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3248 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3249 }
3250
3251 // Save current thread state and restore it at the end of this block.
3252 // And set new thread state to SLEEPING.
3253 JavaThreadSleepState jtss(thread);
3254
3255 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3256 EventThreadSleep event;
3257
3258 if (millis == 0) {
3259 os::naked_yield();
3260 } else {
3261 ThreadState old_state = thread->osthread()->get_state();
3262 thread->osthread()->set_state(SLEEPING);
3263 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3264 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3265 // us while we were sleeping. We do not overwrite those.
3266 if (!HAS_PENDING_EXCEPTION) {
3267 if (event.should_commit()) {
3268 post_thread_sleep_event(&event, millis);
3269 }
3270 HOTSPOT_THREAD_SLEEP_END(1);
3271
3272 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3273 // to properly restore the thread state. That's likely wrong.
3274 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3275 }
3276 }
3277 thread->osthread()->set_state(old_state);
3278 }
3279 if (event.should_commit()) {
3280 post_thread_sleep_event(&event, millis);
3281 }
3282 HOTSPOT_THREAD_SLEEP_END(0);
3283 JVM_END
3284
3285 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3286 JVMWrapper("JVM_CurrentThread");
3287 oop jthread = thread->threadObj();
3288 assert (thread != NULL, "no current thread!");
3289 return JNIHandles::make_local(env, jthread);
3290 JVM_END
3291
3292
3293 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3294 JVMWrapper("JVM_CountStackFrames");
3295
3296 uint32_t debug_bits = 0;
3297 ThreadsListHandle tlh(thread);
3298 JavaThread* receiver = NULL;
3299 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3300 int count = 0;
3301 if (is_alive) {
3302 // jthread refers to a live JavaThread.
3303 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
3304 // Count all java activation, i.e., number of vframes.
3305 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) {
3306 // Native frames are not counted.
3307 if (!vfst.method()->is_native()) count++;
3308 }
3309 } else {
3310 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3311 "this thread is not suspended");
3312 }
3313 }
3314 // Implied else: if JavaThread is not alive simply return a count of 0.
3315
3316 return count;
3317 JVM_END
3318
3319
3320 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3321 JVMWrapper("JVM_Interrupt");
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 Thread::interrupt(receiver);
3329 }
3330 JVM_END
3331
3332
3333 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3334 JVMWrapper("JVM_IsInterrupted");
3335
3336 ThreadsListHandle tlh(thread);
3337 JavaThread* receiver = NULL;
3338 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3339 if (is_alive) {
3340 // jthread refers to a live JavaThread.
3341 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3342 } else {
3343 return JNI_FALSE;
3344 }
3345 JVM_END
3346
3347
3348 // Return true iff the current thread has locked the object passed in
3349
3350 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3351 JVMWrapper("JVM_HoldsLock");
3352 assert(THREAD->is_Java_thread(), "sanity check");
3353 if (obj == NULL) {
3354 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3355 }
3356 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3357 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3358 JVM_END
3359
3360
3361 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3362 JVMWrapper("JVM_DumpAllStacks");
3363 VM_PrintThreads op;
3364 VMThread::execute(&op);
3365 if (JvmtiExport::should_post_data_dump()) {
3366 JvmtiExport::post_data_dump();
3367 }
3368 JVM_END
3369
3370 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3371 JVMWrapper("JVM_SetNativeThreadName");
3372
3373 // We don't use a ThreadsListHandle here because the current thread
3374 // must be alive.
3375 oop java_thread = JNIHandles::resolve_non_null(jthread);
3376 JavaThread* thr = java_lang_Thread::thread(java_thread);
3377 if (thread == thr && !thr->has_attached_via_jni()) {
3378 // Thread naming is only supported for the current thread and
3379 // we don't set the name of an attached thread to avoid stepping
3380 // on other programs.
3381 ResourceMark rm(thread);
3382 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3383 os::set_native_thread_name(thread_name);
3384 }
3385 JVM_END
3386
3387 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3388
3389 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3390 JVMWrapper("JVM_GetClassContext");
3391 ResourceMark rm(THREAD);
3392 JvmtiVMObjectAllocEventCollector oam;
3393 vframeStream vfst(thread);
3394
3395 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3396 // This must only be called from SecurityManager.getClassContext
3397 Method* m = vfst.method();
3398 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3399 m->name() == vmSymbols::getClassContext_name() &&
3400 m->signature() == vmSymbols::void_class_array_signature())) {
3401 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3402 }
3403 }
3404
3405 // Collect method holders
3406 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3407 for (; !vfst.at_end(); vfst.security_next()) {
3408 Method* m = vfst.method();
3409 // Native frames are not returned
3410 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3411 Klass* holder = m->method_holder();
3412 assert(holder->is_klass(), "just checking");
3413 klass_array->append(holder);
3414 }
3415 }
3416
3417 // Create result array of type [Ljava/lang/Class;
3418 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3419 // Fill in mirrors corresponding to method holders
3420 for (int i = 0; i < klass_array->length(); i++) {
3421 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3422 }
3423
3424 return (jobjectArray) JNIHandles::make_local(env, result);
3425 JVM_END
3426
3427
3428 // java.lang.Package ////////////////////////////////////////////////////////////////
3429
3430
3431 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3432 JVMWrapper("JVM_GetSystemPackage");
3433 ResourceMark rm(THREAD);
3434 JvmtiVMObjectAllocEventCollector oam;
3435 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3436 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3437 return (jstring) JNIHandles::make_local(result);
3438 JVM_END
3439
3440
3441 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3442 JVMWrapper("JVM_GetSystemPackages");
3443 JvmtiVMObjectAllocEventCollector oam;
3444 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3445 return (jobjectArray) JNIHandles::make_local(result);
3446 JVM_END
3447
3448
3449 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3450
3451
3452 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3453 JVMWrapper("JVM_GetAndClearReferencePendingList");
3454
3455 MonitorLockerEx ml(Heap_lock);
3456 oop ref = Universe::reference_pending_list();
3457 if (ref != NULL) {
3458 Universe::set_reference_pending_list(NULL);
3459 }
3460 return JNIHandles::make_local(env, ref);
3461 JVM_END
3462
3463 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3464 JVMWrapper("JVM_HasReferencePendingList");
3465 MonitorLockerEx ml(Heap_lock);
3466 return Universe::has_reference_pending_list();
3467 JVM_END
3468
3469 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3470 JVMWrapper("JVM_WaitForReferencePendingList");
3471 MonitorLockerEx ml(Heap_lock);
3472 while (!Universe::has_reference_pending_list()) {
3473 ml.wait();
3474 }
3475 JVM_END
3476
3477
3478 // ObjectInputStream ///////////////////////////////////////////////////////////////
3479
3480 // Return the first user-defined class loader up the execution stack, or null
3481 // if only code from the bootstrap or platform class loader is on the stack.
3482
3483 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3484 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3485 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3486 oop loader = vfst.method()->method_holder()->class_loader();
3487 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3488 return JNIHandles::make_local(env, loader);
3489 }
3490 }
3491 return NULL;
3492 JVM_END
3493
3494
3495 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3496
3497
3498 // resolve array handle and check arguments
3499 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3500 if (arr == NULL) {
3501 THROW_0(vmSymbols::java_lang_NullPointerException());
3502 }
3503 oop a = JNIHandles::resolve_non_null(arr);
3504 if (!a->is_array()) {
3505 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3506 } else if (type_array_only && !a->is_typeArray()) {
3507 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3508 }
3509 return arrayOop(a);
3510 }
3511
3512
3513 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3514 JVMWrapper("JVM_GetArrayLength");
3515 arrayOop a = check_array(env, arr, false, CHECK_0);
3516 return a->length();
3517 JVM_END
3518
3519
3520 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3521 JVMWrapper("JVM_Array_Get");
3522 JvmtiVMObjectAllocEventCollector oam;
3523 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3524 jvalue value;
3525 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3526 oop box = Reflection::box(&value, type, CHECK_NULL);
3527 return JNIHandles::make_local(env, box);
3528 JVM_END
3529
3530
3531 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3532 JVMWrapper("JVM_GetPrimitiveArrayElement");
3533 jvalue value;
3534 value.i = 0; // to initialize value before getting used in CHECK
3535 arrayOop a = check_array(env, arr, true, CHECK_(value));
3536 assert(a->is_typeArray(), "just checking");
3537 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3538 BasicType wide_type = (BasicType) wCode;
3539 if (type != wide_type) {
3540 Reflection::widen(&value, type, wide_type, CHECK_(value));
3541 }
3542 return value;
3543 JVM_END
3544
3545
3546 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3547 JVMWrapper("JVM_SetArrayElement");
3548 arrayOop a = check_array(env, arr, false, CHECK);
3549 oop box = JNIHandles::resolve(val);
3550 jvalue value;
3551 value.i = 0; // to initialize value before getting used in CHECK
3552 BasicType value_type;
3553 if (a->is_objArray()) {
3554 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3555 value_type = Reflection::unbox_for_regular_object(box, &value);
3556 } else {
3557 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3558 }
3559 Reflection::array_set(&value, a, index, value_type, CHECK);
3560 JVM_END
3561
3562
3563 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3564 JVMWrapper("JVM_SetPrimitiveArrayElement");
3565 arrayOop a = check_array(env, arr, true, CHECK);
3566 assert(a->is_typeArray(), "just checking");
3567 BasicType value_type = (BasicType) vCode;
3568 Reflection::array_set(&v, a, index, value_type, CHECK);
3569 JVM_END
3570
3571
3572 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3573 JVMWrapper("JVM_NewArray");
3574 JvmtiVMObjectAllocEventCollector oam;
3575 oop element_mirror = JNIHandles::resolve(eltClass);
3576 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3577 return JNIHandles::make_local(env, result);
3578 JVM_END
3579
3580
3581 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3582 JVMWrapper("JVM_NewMultiArray");
3583 JvmtiVMObjectAllocEventCollector oam;
3584 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3585 oop element_mirror = JNIHandles::resolve(eltClass);
3586 assert(dim_array->is_typeArray(), "just checking");
3587 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3588 return JNIHandles::make_local(env, result);
3589 JVM_END
3590
3591
3592 // Library support ///////////////////////////////////////////////////////////////////////////
3593
3594 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3595 //%note jvm_ct
3596 JVMWrapper("JVM_LoadLibrary");
3597 char ebuf[1024];
3598 void *load_result;
3599 {
3600 ThreadToNativeFromVM ttnfvm(thread);
3601 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3602 }
3603 if (load_result == NULL) {
3604 char msg[1024];
3605 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3606 // Since 'ebuf' may contain a string encoded using
3607 // platform encoding scheme, we need to pass
3608 // Exceptions::unsafe_to_utf8 to the new_exception method
3609 // as the last argument. See bug 6367357.
3610 Handle h_exception =
3611 Exceptions::new_exception(thread,
3612 vmSymbols::java_lang_UnsatisfiedLinkError(),
3613 msg, Exceptions::unsafe_to_utf8);
3614
3615 THROW_HANDLE_0(h_exception);
3616 }
3617 return load_result;
3618 JVM_END
3619
3620
3621 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3622 JVMWrapper("JVM_UnloadLibrary");
3623 os::dll_unload(handle);
3624 JVM_END
3625
3626
3627 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3628 JVMWrapper("JVM_FindLibraryEntry");
3629 return os::dll_lookup(handle, name);
3630 JVM_END
3631
3632
3633 // JNI version ///////////////////////////////////////////////////////////////////////////////
3634
3635 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3636 JVMWrapper("JVM_IsSupportedJNIVersion");
3637 return Threads::is_supported_jni_version_including_1_1(version);
3638 JVM_END
3639
3640
3641 // String support ///////////////////////////////////////////////////////////////////////////
3642
3643 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3644 JVMWrapper("JVM_InternString");
3645 JvmtiVMObjectAllocEventCollector oam;
3646 if (str == NULL) return NULL;
3647 oop string = JNIHandles::resolve_non_null(str);
3648 oop result = StringTable::intern(string, CHECK_NULL);
3649 return (jstring) JNIHandles::make_local(env, result);
3650 JVM_END
3651
3652
3653 // Raw monitor support //////////////////////////////////////////////////////////////////////
3654
3655 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3656 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3657 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3658 // that only works with java threads.
3659
3660
3661 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3662 VM_Exit::block_if_vm_exited();
3663 JVMWrapper("JVM_RawMonitorCreate");
3664 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3665 }
3666
3667
3668 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3669 VM_Exit::block_if_vm_exited();
3670 JVMWrapper("JVM_RawMonitorDestroy");
3671 delete ((Mutex*) mon);
3672 }
3673
3674
3675 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3676 VM_Exit::block_if_vm_exited();
3677 JVMWrapper("JVM_RawMonitorEnter");
3678 ((Mutex*) mon)->jvm_raw_lock();
3679 return 0;
3680 }
3681
3682
3683 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3684 VM_Exit::block_if_vm_exited();
3685 JVMWrapper("JVM_RawMonitorExit");
3686 ((Mutex*) mon)->jvm_raw_unlock();
3687 }
3688
3689
3690 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3691
3692 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3693 Handle loader, Handle protection_domain,
3694 jboolean throwError, TRAPS) {
3695 // Security Note:
3696 // The Java level wrapper will perform the necessary security check allowing
3697 // us to pass the NULL as the initiating class loader. The VM is responsible for
3698 // the checkPackageAccess relative to the initiating class loader via the
3699 // protection_domain. The protection_domain is passed as NULL by the java code
3700 // if there is no security manager in 3-arg Class.forName().
3701 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3702
3703 // Check if we should initialize the class
3704 if (init && klass->is_instance_klass()) {
3705 klass->initialize(CHECK_NULL);
3706 }
3707 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3708 }
3709
3710
3711 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3712
3713 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3714 JVMWrapper("JVM_InvokeMethod");
3715 Handle method_handle;
3716 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3717 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3718 Handle receiver(THREAD, JNIHandles::resolve(obj));
3719 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3720 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3721 jobject res = JNIHandles::make_local(env, result);
3722 if (JvmtiExport::should_post_vm_object_alloc()) {
3723 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3724 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3725 if (java_lang_Class::is_primitive(ret_type)) {
3726 // Only for primitive type vm allocates memory for java object.
3727 // See box() method.
3728 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3729 }
3730 }
3731 return res;
3732 } else {
3733 THROW_0(vmSymbols::java_lang_StackOverflowError());
3734 }
3735 JVM_END
3736
3737
3738 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3739 JVMWrapper("JVM_NewInstanceFromConstructor");
3740 oop constructor_mirror = JNIHandles::resolve(c);
3741 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3742 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3743 jobject res = JNIHandles::make_local(env, result);
3744 if (JvmtiExport::should_post_vm_object_alloc()) {
3745 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3746 }
3747 return res;
3748 JVM_END
3749
3750 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3751
3752 JVM_LEAF(jboolean, JVM_SupportsCX8())
3753 JVMWrapper("JVM_SupportsCX8");
3754 return VM_Version::supports_cx8();
3755 JVM_END
3756
3757 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3758 JVMWrapper("JVM_InitializeFromArchive");
3759 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3760 assert(k->is_klass(), "just checking");
3761 HeapShared::initialize_from_archived_subgraph(k);
3762 JVM_END
3763
3764 // Returns an array of all live Thread objects (VM internal JavaThreads,
3765 // jvmti agent threads, and JNI attaching threads are skipped)
3766 // See CR 6404306 regarding JNI attaching threads
3767 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3768 ResourceMark rm(THREAD);
3769 ThreadsListEnumerator tle(THREAD, false, false);
3770 JvmtiVMObjectAllocEventCollector oam;
3771
3772 int num_threads = tle.num_threads();
3773 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3774 objArrayHandle threads_ah(THREAD, r);
3775
3776 for (int i = 0; i < num_threads; i++) {
3777 Handle h = tle.get_threadObj(i);
3778 threads_ah->obj_at_put(i, h());
3779 }
3780
3781 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3782 JVM_END
3783
3784
3785 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3786 // Return StackTraceElement[][], each element is the stack trace of a thread in
3787 // the corresponding entry in the given threads array
3788 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3789 JVMWrapper("JVM_DumpThreads");
3790 JvmtiVMObjectAllocEventCollector oam;
3791
3792 // Check if threads is null
3793 if (threads == NULL) {
3794 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3795 }
3796
3797 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3798 objArrayHandle ah(THREAD, a);
3799 int num_threads = ah->length();
3800 // check if threads is non-empty array
3801 if (num_threads == 0) {
3802 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3803 }
3804
3805 // check if threads is not an array of objects of Thread class
3806 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3807 if (k != SystemDictionary::Thread_klass()) {
3808 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3809 }
3810
3811 ResourceMark rm(THREAD);
3812
3813 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3814 for (int i = 0; i < num_threads; i++) {
3815 oop thread_obj = ah->obj_at(i);
3816 instanceHandle h(THREAD, (instanceOop) thread_obj);
3817 thread_handle_array->append(h);
3818 }
3819
3820 // The JavaThread references in thread_handle_array are validated
3821 // in VM_ThreadDump::doit().
3822 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3823 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3824
3825 JVM_END
3826
3827 // JVM monitoring and management support
3828 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3829 return Management::get_jmm_interface(version);
3830 JVM_END
3831
3832 // com.sun.tools.attach.VirtualMachine agent properties support
3833 //
3834 // Initialize the agent properties with the properties maintained in the VM
3835 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3836 JVMWrapper("JVM_InitAgentProperties");
3837 ResourceMark rm;
3838
3839 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3840
3841 PUTPROP(props, "sun.java.command", Arguments::java_command());
3842 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3843 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3844 return properties;
3845 JVM_END
3846
3847 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3848 {
3849 JVMWrapper("JVM_GetEnclosingMethodInfo");
3850 JvmtiVMObjectAllocEventCollector oam;
3851
3852 if (ofClass == NULL) {
3853 return NULL;
3854 }
3855 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3856 // Special handling for primitive objects
3857 if (java_lang_Class::is_primitive(mirror())) {
3858 return NULL;
3859 }
3860 Klass* k = java_lang_Class::as_Klass(mirror());
3861 if (!k->is_instance_klass()) {
3862 return NULL;
3863 }
3864 InstanceKlass* ik = InstanceKlass::cast(k);
3865 int encl_method_class_idx = ik->enclosing_method_class_index();
3866 if (encl_method_class_idx == 0) {
3867 return NULL;
3868 }
3869 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3870 objArrayHandle dest(THREAD, dest_o);
3871 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3872 dest->obj_at_put(0, enc_k->java_mirror());
3873 int encl_method_method_idx = ik->enclosing_method_method_index();
3874 if (encl_method_method_idx != 0) {
3875 Symbol* sym = ik->constants()->symbol_at(
3876 extract_low_short_from_int(
3877 ik->constants()->name_and_type_at(encl_method_method_idx)));
3878 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3879 dest->obj_at_put(1, str());
3880 sym = ik->constants()->symbol_at(
3881 extract_high_short_from_int(
3882 ik->constants()->name_and_type_at(encl_method_method_idx)));
3883 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3884 dest->obj_at_put(2, str());
3885 }
3886 return (jobjectArray) JNIHandles::make_local(dest());
3887 }
3888 JVM_END
3889
3890 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3891 {
3892 memset(info, 0, info_size);
3893
3894 info->jvm_version = VM_Version::jvm_version();
3895 info->patch_version = VM_Version::vm_patch_version();
3896
3897 // when we add a new capability in the jvm_version_info struct, we should also
3898 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3899 // counter defined in runtimeService.cpp.
3900 info->is_attach_supported = AttachListener::is_attach_supported();
3901 }
3902 JVM_END
3903
3904 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3905 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3906 ResourceMark rm(THREAD);
3907
3908 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3909 return NULL;
3910 }
3911
3912 char** vm_flags = Arguments::jvm_flags_array();
3913 char** vm_args = Arguments::jvm_args_array();
3914 int num_flags = Arguments::num_jvm_flags();
3915 int num_args = Arguments::num_jvm_args();
3916
3917 InstanceKlass* ik = SystemDictionary::String_klass();
3918 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3919 objArrayHandle result_h(THREAD, r);
3920
3921 int index = 0;
3922 for (int j = 0; j < num_flags; j++, index++) {
3923 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3924 result_h->obj_at_put(index, h());
3925 }
3926 for (int i = 0; i < num_args; i++, index++) {
3927 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3928 result_h->obj_at_put(index, h());
3929 }
3930 return (jobjectArray) JNIHandles::make_local(env, result_h());
3931 JVM_END
3932
3933 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3934 return os::get_signal_number(name);
3935 JVM_END