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/stackwalk.hpp"
59 #include "runtime/arguments.hpp"
60 #include "runtime/atomic.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/init.hpp"
63 #include "runtime/interfaceSupport.inline.hpp"
64 #include "runtime/java.hpp"
65 #include "runtime/javaCalls.hpp"
66 #include "runtime/jfieldIDWorkaround.hpp"
67 #include "runtime/jniHandles.inline.hpp"
68 #include "runtime/orderAccess.hpp"
69 #include "runtime/os.inline.hpp"
70 #include "runtime/perfData.hpp"
71 #include "runtime/reflection.hpp"
72 #include "runtime/thread.inline.hpp"
73 #include "runtime/threadSMR.hpp"
74 #include "runtime/vframe.inline.hpp"
75 #include "runtime/vm_operations.hpp"
76 #include "runtime/vm_version.hpp"
77 #include "services/attachListener.hpp"
78 #include "services/management.hpp"
79 #include "services/threadService.hpp"
80 #include "utilities/copy.hpp"
81 #include "utilities/defaultStream.hpp"
82 #include "utilities/dtrace.hpp"
83 #include "utilities/events.hpp"
84 #include "utilities/histogram.hpp"
85 #include "utilities/macros.hpp"
86 #include "utilities/utf8.hpp"
87 #if INCLUDE_CDS
88 #include "classfile/systemDictionaryShared.hpp"
89 #endif
90
91 #include <errno.h>
92
93 /*
94 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
95 such ctors and calls MUST NOT come between an oop declaration/init and its
96 usage because if objects are move this may cause various memory stomps, bus
97 errors and segfaults. Here is a cookbook for causing so called "naked oop
98 failures":
99
100 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
101 JVMWrapper("JVM_GetClassDeclaredFields");
102
103 // Object address to be held directly in mirror & not visible to GC
104 oop mirror = JNIHandles::resolve_non_null(ofClass);
105
106 // If this ctor can hit a safepoint, moving objects around, then
107 ComplexConstructor foo;
108
109 // Boom! mirror may point to JUNK instead of the intended object
110 (some dereference of mirror)
111
112 // Here's another call that may block for GC, making mirror stale
113 MutexLocker ml(some_lock);
114
115 // And here's an initializer that can result in a stale oop
116 // all in one step.
117 oop o = call_that_can_throw_exception(TRAPS);
118
119
120 The solution is to keep the oop declaration BELOW the ctor or function
121 call that might cause a GC, do another resolve to reassign the oop, or
122 consider use of a Handle instead of an oop so there is immunity from object
123 motion. But note that the "QUICK" entries below do not have a handlemark
124 and thus can only support use of handles passed in.
125 */
126
127 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
128 ResourceMark rm;
129 int line_number = -1;
130 const char * source_file = NULL;
131 const char * trace = "explicit";
132 InstanceKlass* caller = NULL;
133 JavaThread* jthread = JavaThread::current();
134 if (jthread->has_last_Java_frame()) {
135 vframeStream vfst(jthread);
136
137 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
138 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
139 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
140 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
141 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
142
143 Method* last_caller = NULL;
144
145 while (!vfst.at_end()) {
146 Method* m = vfst.method();
147 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
148 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
149 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
150 break;
151 }
152 last_caller = m;
153 vfst.next();
154 }
155 // if this is called from Class.forName0 and that is called from Class.forName,
156 // then print the caller of Class.forName. If this is Class.loadClass, then print
157 // that caller, otherwise keep quiet since this should be picked up elsewhere.
158 bool found_it = false;
159 if (!vfst.at_end() &&
160 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
161 vfst.method()->name() == vmSymbols::forName0_name()) {
162 vfst.next();
163 if (!vfst.at_end() &&
164 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
165 vfst.method()->name() == vmSymbols::forName_name()) {
166 vfst.next();
167 found_it = true;
168 }
169 } else if (last_caller != NULL &&
170 last_caller->method_holder()->name() ==
171 vmSymbols::java_lang_ClassLoader() &&
172 last_caller->name() == vmSymbols::loadClass_name()) {
173 found_it = true;
174 } else if (!vfst.at_end()) {
175 if (vfst.method()->is_native()) {
176 // JNI call
177 found_it = true;
178 }
179 }
180 if (found_it && !vfst.at_end()) {
181 // found the caller
182 caller = vfst.method()->method_holder();
183 line_number = vfst.method()->line_number_from_bci(vfst.bci());
184 if (line_number == -1) {
185 // show method name if it's a native method
186 trace = vfst.method()->name_and_sig_as_C_string();
187 }
188 Symbol* s = caller->source_file_name();
189 if (s != NULL) {
190 source_file = s->as_C_string();
191 }
192 }
193 }
194 if (caller != NULL) {
195 if (to_class != caller) {
196 const char * from = caller->external_name();
197 const char * to = to_class->external_name();
198 // print in a single call to reduce interleaving between threads
199 if (source_file != NULL) {
200 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
201 } else {
202 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
203 }
204 }
205 }
206 }
207
208 void trace_class_resolution(Klass* to_class) {
209 EXCEPTION_MARK;
210 trace_class_resolution_impl(to_class, THREAD);
211 if (HAS_PENDING_EXCEPTION) {
212 CLEAR_PENDING_EXCEPTION;
213 }
214 }
215
216 // Wrapper to trace JVM functions
217
218 #ifdef ASSERT
219 Histogram* JVMHistogram;
220 volatile int JVMHistogram_lock = 0;
221
222 class JVMHistogramElement : public HistogramElement {
223 public:
224 JVMHistogramElement(const char* name);
225 };
226
227 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
228 _name = elementName;
229 uintx count = 0;
230
231 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
232 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
233 count +=1;
234 if ( (WarnOnStalledSpinLock > 0)
235 && (count % WarnOnStalledSpinLock == 0)) {
236 warning("JVMHistogram_lock seems to be stalled");
237 }
238 }
239 }
240
241 if(JVMHistogram == NULL)
242 JVMHistogram = new Histogram("JVM Call Counts",100);
243
244 JVMHistogram->add_element(this);
245 Atomic::dec(&JVMHistogram_lock);
246 }
247
248 #define JVMCountWrapper(arg) \
249 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
250 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
251
252 #define JVMWrapper(arg) JVMCountWrapper(arg);
253 #else
254 #define JVMWrapper(arg)
255 #endif
256
257
258 // Interface version /////////////////////////////////////////////////////////////////////
259
260
261 JVM_LEAF(jint, JVM_GetInterfaceVersion())
262 return JVM_INTERFACE_VERSION;
263 JVM_END
264
265
266 // java.lang.System //////////////////////////////////////////////////////////////////////
267
268
269 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
270 JVMWrapper("JVM_CurrentTimeMillis");
271 return os::javaTimeMillis();
272 JVM_END
273
274 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
275 JVMWrapper("JVM_NanoTime");
276 return os::javaTimeNanos();
277 JVM_END
278
279 // The function below is actually exposed by jdk.internal.misc.VM and not
280 // java.lang.System, but we choose to keep it here so that it stays next
281 // to JVM_CurrentTimeMillis and JVM_NanoTime
282
283 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
284 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
285
286 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
287 JVMWrapper("JVM_GetNanoTimeAdjustment");
288 jlong seconds;
289 jlong nanos;
290
291 os::javaTimeSystemUTC(seconds, nanos);
292
293 // We're going to verify that the result can fit in a long.
294 // For that we need the difference in seconds between 'seconds'
295 // and 'offset_secs' to be such that:
296 // |seconds - offset_secs| < (2^63/10^9)
297 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
298 // which makes |seconds - offset_secs| < 2^33
299 // and we will prefer +/- 2^32 as the maximum acceptable diff
300 // as 2^32 has a more natural feel than 2^33...
301 //
302 // So if |seconds - offset_secs| >= 2^32 - we return a special
303 // sentinel value (-1) which the caller should take as an
304 // exception value indicating that the offset given to us is
305 // too far from range of the current time - leading to too big
306 // a nano adjustment. The caller is expected to recover by
307 // computing a more accurate offset and calling this method
308 // again. (For the record 2^32 secs is ~136 years, so that
309 // should rarely happen)
310 //
311 jlong diff = seconds - offset_secs;
312 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
313 return -1; // sentinel value: the offset is too far off the target
314 }
315
316 // return the adjustment. If you compute a time by adding
317 // this number of nanoseconds along with the number of seconds
318 // in the offset you should get the current UTC time.
319 return (diff * (jlong)1000000000) + nanos;
320 JVM_END
321
322 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
323 jobject dst, jint dst_pos, jint length))
324 JVMWrapper("JVM_ArrayCopy");
325 // Check if we have null pointers
326 if (src == NULL || dst == NULL) {
327 THROW(vmSymbols::java_lang_NullPointerException());
328 }
329 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
330 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
331 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
332 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
333 // Do copy
334 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
335 JVM_END
336
337
338 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
339 JavaValue r(T_OBJECT);
340 // public synchronized Object put(Object key, Object value);
341 HandleMark hm(THREAD);
342 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
343 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
344 JavaCalls::call_virtual(&r,
345 props,
346 SystemDictionary::Properties_klass(),
347 vmSymbols::put_name(),
348 vmSymbols::object_object_object_signature(),
349 key_str,
350 value_str,
351 THREAD);
352 }
353
354
355 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
356
357
358 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
359 JVMWrapper("JVM_InitProperties");
360 ResourceMark rm;
361
362 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
363
364 // System property list includes both user set via -D option and
365 // jvm system specific properties.
366 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
367 PUTPROP(props, p->key(), p->value());
368 }
369
370 // Convert the -XX:MaxDirectMemorySize= command line flag
371 // to the sun.nio.MaxDirectMemorySize property.
372 // Do this after setting user properties to prevent people
373 // from setting the value with a -D option, as requested.
374 {
375 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
376 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
377 } else {
378 char as_chars[256];
379 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
380 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
381 }
382 }
383
384 // JVM monitoring and management support
385 // Add the sun.management.compiler property for the compiler's name
386 {
387 #undef CSIZE
388 #if defined(_LP64) || defined(_WIN64)
389 #define CSIZE "64-Bit "
390 #else
391 #define CSIZE
392 #endif // 64bit
393
394 #ifdef TIERED
395 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
396 #else
397 #if defined(COMPILER1)
398 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
399 #elif defined(COMPILER2)
400 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
401 #elif INCLUDE_JVMCI
402 #error "INCLUDE_JVMCI should imply TIERED"
403 #else
404 const char* compiler_name = "";
405 #endif // compilers
406 #endif // TIERED
407
408 if (*compiler_name != '\0' &&
409 (Arguments::mode() != Arguments::_int)) {
410 PUTPROP(props, "sun.management.compiler", compiler_name);
411 }
412 }
413
414 return properties;
415 JVM_END
416
417
418 /*
419 * Return the temporary directory that the VM uses for the attach
420 * and perf data files.
421 *
422 * It is important that this directory is well-known and the
423 * same for all VM instances. It cannot be affected by configuration
424 * variables such as java.io.tmpdir.
425 */
426 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
427 JVMWrapper("JVM_GetTemporaryDirectory");
428 HandleMark hm(THREAD);
429 const char* temp_dir = os::get_temp_directory();
430 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
431 return (jstring) JNIHandles::make_local(env, h());
432 JVM_END
433
434
435 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
436
437 extern volatile jint vm_created;
438
439 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
440 JVMWrapper("JVM_BeforeHalt");
441 EventShutdown event;
442 if (event.should_commit()) {
443 event.set_reason("Shutdown requested from Java");
444 event.commit();
445 }
446 JVM_END
447
448
449 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
450 before_exit(thread);
451 vm_exit(code);
452 JVM_END
453
454
455 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
456 JVMWrapper("JVM_GC");
457 if (!DisableExplicitGC) {
458 Universe::heap()->collect(GCCause::_java_lang_system_gc);
459 }
460 JVM_END
461
462
463 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
464 JVMWrapper("JVM_MaxObjectInspectionAge");
465 return Universe::heap()->millis_since_last_gc();
466 JVM_END
467
468
469 static inline jlong convert_size_t_to_jlong(size_t val) {
470 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
471 NOT_LP64 (return (jlong)val;)
472 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
473 }
474
475 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
476 JVMWrapper("JVM_TotalMemory");
477 size_t n = Universe::heap()->capacity();
478 return convert_size_t_to_jlong(n);
479 JVM_END
480
481
482 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
483 JVMWrapper("JVM_FreeMemory");
484 CollectedHeap* ch = Universe::heap();
485 size_t n;
486 {
487 MutexLocker x(Heap_lock);
488 n = ch->capacity() - ch->used();
489 }
490 return convert_size_t_to_jlong(n);
491 JVM_END
492
493
494 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
495 JVMWrapper("JVM_MaxMemory");
496 size_t n = Universe::heap()->max_capacity();
497 return convert_size_t_to_jlong(n);
498 JVM_END
499
500
501 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
502 JVMWrapper("JVM_ActiveProcessorCount");
503 return os::active_processor_count();
504 JVM_END
505
506
507
508 // java.lang.Throwable //////////////////////////////////////////////////////
509
510
511 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
512 JVMWrapper("JVM_FillInStackTrace");
513 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
514 java_lang_Throwable::fill_in_stack_trace(exception);
515 JVM_END
516
517
518 // java.lang.StackTraceElement //////////////////////////////////////////////
519
520
521 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
522 JVMWrapper("JVM_InitStackTraceElementArray");
523 Handle exception(THREAD, JNIHandles::resolve(throwable));
524 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
525 objArrayHandle stack_trace(THREAD, st);
526 // Fill in the allocated stack trace
527 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
528 JVM_END
529
530
531 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
532 JVMWrapper("JVM_InitStackTraceElement");
533 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
534 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
535 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
536 JVM_END
537
538
539 // java.lang.StackWalker //////////////////////////////////////////////////////
540
541
542 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
543 jint skip_frames, jint frame_count, jint start_index,
544 jobjectArray frames))
545 JVMWrapper("JVM_CallStackWalk");
546 JavaThread* jt = (JavaThread*) THREAD;
547 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
548 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
549 }
550
551 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
552
553 // frames array is a Class<?>[] array when only getting caller reference,
554 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
555 // be null.
556 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
557 objArrayHandle frames_array_h(THREAD, fa);
558
559 int limit = start_index + frame_count;
560 if (frames_array_h->length() < limit) {
561 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
562 }
563
564 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
565 start_index, frames_array_h, CHECK_NULL);
566 return JNIHandles::make_local(env, result);
567 JVM_END
568
569
570 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
571 jint frame_count, jint start_index,
572 jobjectArray frames))
573 JVMWrapper("JVM_MoreStackWalk");
574 JavaThread* jt = (JavaThread*) THREAD;
575
576 // frames array is a Class<?>[] array when only getting caller reference,
577 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
578 // be null.
579 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
580 objArrayHandle frames_array_h(THREAD, fa);
581
582 int limit = start_index+frame_count;
583 if (frames_array_h->length() < limit) {
584 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
585 }
586
587 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
588 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
589 start_index, frames_array_h, THREAD);
590 JVM_END
591
592 // java.lang.Object ///////////////////////////////////////////////
593
594
595 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
596 JVMWrapper("JVM_IHashCode");
597 // as implemented in the classic virtual machine; return 0 if object is NULL
598 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
599 JVM_END
600
601
602 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
603 JVMWrapper("JVM_MonitorWait");
604 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
605 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
606 if (JvmtiExport::should_post_monitor_wait()) {
607 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
608
609 // The current thread already owns the monitor and it has not yet
610 // been added to the wait queue so the current thread cannot be
611 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
612 // event handler cannot accidentally consume an unpark() meant for
613 // the ParkEvent associated with this ObjectMonitor.
614 }
615 ObjectSynchronizer::wait(obj, ms, CHECK);
616 JVM_END
617
618
619 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
620 JVMWrapper("JVM_MonitorNotify");
621 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
622 ObjectSynchronizer::notify(obj, CHECK);
623 JVM_END
624
625
626 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
627 JVMWrapper("JVM_MonitorNotifyAll");
628 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
629 ObjectSynchronizer::notifyall(obj, CHECK);
630 JVM_END
631
632
633 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
634 JVMWrapper("JVM_Clone");
635 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
636 Klass* klass = obj->klass();
637 JvmtiVMObjectAllocEventCollector oam;
638
639 #ifdef ASSERT
640 // Just checking that the cloneable flag is set correct
641 if (obj->is_array()) {
642 guarantee(klass->is_cloneable(), "all arrays are cloneable");
643 } else {
644 guarantee(obj->is_instance(), "should be instanceOop");
645 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
646 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
647 }
648 #endif
649
650 // Check if class of obj supports the Cloneable interface.
651 // All arrays are considered to be cloneable (See JLS 20.1.5).
652 // All j.l.r.Reference classes are considered non-cloneable.
653 if (!klass->is_cloneable() ||
654 (klass->is_instance_klass() &&
655 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
656 ResourceMark rm(THREAD);
657 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
658 }
659
660 // Make shallow object copy
661 const int size = obj->size();
662 oop new_obj_oop = NULL;
663 if (obj->is_array()) {
664 const int length = ((arrayOop)obj())->length();
665 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
666 /* do_zero */ true, CHECK_NULL);
667 } else {
668 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
669 }
670
671 HeapAccess<>::clone(obj(), new_obj_oop, size);
672
673 Handle new_obj(THREAD, new_obj_oop);
674 // Caution: this involves a java upcall, so the clone should be
675 // "gc-robust" by this stage.
676 if (klass->has_finalizer()) {
677 assert(obj->is_instance(), "should be instanceOop");
678 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
679 new_obj = Handle(THREAD, new_obj_oop);
680 }
681
682 return JNIHandles::make_local(env, new_obj());
683 JVM_END
684
685 // java.io.File ///////////////////////////////////////////////////////////////
686
687 JVM_LEAF(char*, JVM_NativePath(char* path))
688 JVMWrapper("JVM_NativePath");
689 return os::native_path(path);
690 JVM_END
691
692
693 // Misc. class handling ///////////////////////////////////////////////////////////
694
695
696 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
697 JVMWrapper("JVM_GetCallerClass");
698
699 // Getting the class of the caller frame.
700 //
701 // The call stack at this point looks something like this:
702 //
703 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
704 // [1] [ @CallerSensitive API.method ]
705 // [.] [ (skipped intermediate frames) ]
706 // [n] [ caller ]
707 vframeStream vfst(thread);
708 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
709 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
710 Method* m = vfst.method();
711 assert(m != NULL, "sanity");
712 switch (n) {
713 case 0:
714 // This must only be called from Reflection.getCallerClass
715 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
716 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
717 }
718 // fall-through
719 case 1:
720 // Frame 0 and 1 must be caller sensitive.
721 if (!m->caller_sensitive()) {
722 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
723 }
724 break;
725 default:
726 if (!m->is_ignored_by_security_stack_walk()) {
727 // We have reached the desired frame; return the holder class.
728 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
729 }
730 break;
731 }
732 }
733 return NULL;
734 JVM_END
735
736
737 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
738 JVMWrapper("JVM_FindPrimitiveClass");
739 oop mirror = NULL;
740 BasicType t = name2type(utf);
741 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
742 mirror = Universe::java_mirror(t);
743 }
744 if (mirror == NULL) {
745 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
746 } else {
747 return (jclass) JNIHandles::make_local(env, mirror);
748 }
749 JVM_END
750
751
752 // Returns a class loaded by the bootstrap class loader; or null
753 // if not found. ClassNotFoundException is not thrown.
754 // FindClassFromBootLoader is exported to the launcher for windows.
755 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
756 const char* name))
757 JVMWrapper("JVM_FindClassFromBootLoader");
758
759 // Java libraries should ensure that name is never null...
760 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
761 // It's impossible to create this class; the name cannot fit
762 // into the constant pool.
763 return NULL;
764 }
765
766 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
767 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
768 if (k == NULL) {
769 return NULL;
770 }
771
772 if (log_is_enabled(Debug, class, resolve)) {
773 trace_class_resolution(k);
774 }
775 return (jclass) JNIHandles::make_local(env, k->java_mirror());
776 JVM_END
777
778 // Find a class with this name in this loader, using the caller's protection domain.
779 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
780 jboolean init, jobject loader,
781 jclass caller))
782 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
783 // Java libraries should ensure that name is never null...
784 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
785 // It's impossible to create this class; the name cannot fit
786 // into the constant pool.
787 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
788 }
789
790 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
791
792 oop loader_oop = JNIHandles::resolve(loader);
793 oop from_class = JNIHandles::resolve(caller);
794 oop protection_domain = NULL;
795 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
796 // NPE. Put it in another way, the bootstrap class loader has all permission and
797 // thus no checkPackageAccess equivalence in the VM class loader.
798 // The caller is also passed as NULL by the java code if there is no security
799 // manager to avoid the performance cost of getting the calling class.
800 if (from_class != NULL && loader_oop != NULL) {
801 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
802 }
803
804 Handle h_loader(THREAD, loader_oop);
805 Handle h_prot(THREAD, protection_domain);
806 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
807 h_prot, false, THREAD);
808
809 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
810 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
811 }
812 return result;
813 JVM_END
814
815 // Currently only called from the old verifier.
816 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
817 jboolean init, jclass from))
818 JVMWrapper("JVM_FindClassFromClass");
819 if (name == NULL) {
820 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
821 }
822 if ((int)strlen(name) > Symbol::max_length()) {
823 // It's impossible to create this class; the name cannot fit
824 // into the constant pool.
825 Exceptions::fthrow(THREAD_AND_LOCATION,
826 vmSymbols::java_lang_NoClassDefFoundError(),
827 "Class name exceeds maximum length of %d: %s",
828 Symbol::max_length(),
829 name);
830 return 0;
831 }
832 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
833 oop from_class_oop = JNIHandles::resolve(from);
834 Klass* from_class = (from_class_oop == NULL)
835 ? (Klass*)NULL
836 : java_lang_Class::as_Klass(from_class_oop);
837 oop class_loader = NULL;
838 oop protection_domain = NULL;
839 if (from_class != NULL) {
840 class_loader = from_class->class_loader();
841 protection_domain = from_class->protection_domain();
842 }
843 Handle h_loader(THREAD, class_loader);
844 Handle h_prot (THREAD, protection_domain);
845 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
846 h_prot, true, thread);
847 if (result != NULL) {
848 oop mirror = JNIHandles::resolve_non_null(result);
849 Klass* to_class = java_lang_Class::as_Klass(mirror);
850 ClassLoaderData::class_loader_data(h_loader())->record_dependency(to_class);
851 }
852
853 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
854 // this function is generally only used for class loading during verification.
855 ResourceMark rm;
856 oop from_mirror = JNIHandles::resolve_non_null(from);
857 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
858 const char * from_name = from_class->external_name();
859
860 oop mirror = JNIHandles::resolve_non_null(result);
861 Klass* to_class = java_lang_Class::as_Klass(mirror);
862 const char * to = to_class->external_name();
863 log_debug(class, resolve)("%s %s (verification)", from_name, to);
864 }
865
866 return result;
867 JVM_END
868
869 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
870 if (loader.is_null()) {
871 return;
872 }
873
874 // check whether the current caller thread holds the lock or not.
875 // If not, increment the corresponding counter
876 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
877 ObjectSynchronizer::owner_self) {
878 counter->inc();
879 }
880 }
881
882 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
883 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
884 jobject loader, const jbyte *buf,
885 jsize len, jobject pd, const char *source,
886 TRAPS) {
887 if (source == NULL) source = "__JVM_DefineClass__";
888
889 assert(THREAD->is_Java_thread(), "must be a JavaThread");
890 JavaThread* jt = (JavaThread*) THREAD;
891
892 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
893 ClassLoader::perf_define_appclass_selftime(),
894 ClassLoader::perf_define_appclasses(),
895 jt->get_thread_stat()->perf_recursion_counts_addr(),
896 jt->get_thread_stat()->perf_timers_addr(),
897 PerfClassTraceTime::DEFINE_CLASS);
898
899 if (UsePerfData) {
900 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
901 }
902
903 // Since exceptions can be thrown, class initialization can take place
904 // if name is NULL no check for class name in .class stream has to be made.
905 TempNewSymbol class_name = NULL;
906 if (name != NULL) {
907 const int str_len = (int)strlen(name);
908 if (str_len > Symbol::max_length()) {
909 // It's impossible to create this class; the name cannot fit
910 // into the constant pool.
911 Exceptions::fthrow(THREAD_AND_LOCATION,
912 vmSymbols::java_lang_NoClassDefFoundError(),
913 "Class name exceeds maximum length of %d: %s",
914 Symbol::max_length(),
915 name);
916 return 0;
917 }
918 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
919 }
920
921 ResourceMark rm(THREAD);
922 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
923 Handle class_loader (THREAD, JNIHandles::resolve(loader));
924 if (UsePerfData) {
925 is_lock_held_by_thread(class_loader,
926 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
927 THREAD);
928 }
929 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
930 Klass* k = SystemDictionary::resolve_from_stream(class_name,
931 class_loader,
932 protection_domain,
933 &st,
934 CHECK_NULL);
935
936 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
937 trace_class_resolution(k);
938 }
939
940 return (jclass) JNIHandles::make_local(env, k->java_mirror());
941 }
942
943
944 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
945 JVMWrapper("JVM_DefineClass");
946
947 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
948 JVM_END
949
950
951 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
952 JVMWrapper("JVM_DefineClassWithSource");
953
954 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
955 JVM_END
956
957 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
958 JVMWrapper("JVM_FindLoadedClass");
959 ResourceMark rm(THREAD);
960
961 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
962 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
963
964 const char* str = java_lang_String::as_utf8_string(string());
965 // Sanity check, don't expect null
966 if (str == NULL) return NULL;
967
968 const int str_len = (int)strlen(str);
969 if (str_len > Symbol::max_length()) {
970 // It's impossible to create this class; the name cannot fit
971 // into the constant pool.
972 return NULL;
973 }
974 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
975
976 // Security Note:
977 // The Java level wrapper will perform the necessary security check allowing
978 // us to pass the NULL as the initiating class loader.
979 Handle h_loader(THREAD, JNIHandles::resolve(loader));
980 if (UsePerfData) {
981 is_lock_held_by_thread(h_loader,
982 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
983 THREAD);
984 }
985
986 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
987 h_loader,
988 Handle(),
989 CHECK_NULL);
990 #if INCLUDE_CDS
991 if (k == NULL) {
992 // If the class is not already loaded, try to see if it's in the shared
993 // archive for the current classloader (h_loader).
994 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
995 }
996 #endif
997 return (k == NULL) ? NULL :
998 (jclass) JNIHandles::make_local(env, k->java_mirror());
999 JVM_END
1000
1001 // Module support //////////////////////////////////////////////////////////////////////////////
1002
1003 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1004 jstring location, const char* const* packages, jsize num_packages))
1005 JVMWrapper("JVM_DefineModule");
1006 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1007 JVM_END
1008
1009 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1010 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1011 Modules::set_bootloader_unnamed_module(module, CHECK);
1012 JVM_END
1013
1014 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1015 JVMWrapper("JVM_AddModuleExports");
1016 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1017 JVM_END
1018
1019 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1020 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1021 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1022 JVM_END
1023
1024 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1025 JVMWrapper("JVM_AddModuleExportsToAll");
1026 Modules::add_module_exports(from_module, package, NULL, CHECK);
1027 JVM_END
1028
1029 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1030 JVMWrapper("JVM_AddReadsModule");
1031 Modules::add_reads_module(from_module, source_module, CHECK);
1032 JVM_END
1033
1034 // Reflection support //////////////////////////////////////////////////////////////////////////////
1035
1036 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1037 assert (cls != NULL, "illegal class");
1038 JVMWrapper("JVM_GetClassName");
1039 JvmtiVMObjectAllocEventCollector oam;
1040 ResourceMark rm(THREAD);
1041 const char* name;
1042 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1043 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1044 } else {
1045 // Consider caching interned string in Klass
1046 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1047 assert(k->is_klass(), "just checking");
1048 name = k->external_name();
1049 }
1050 oop result = StringTable::intern((char*) name, CHECK_NULL);
1051 return (jstring) JNIHandles::make_local(env, result);
1052 JVM_END
1053
1054
1055 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1056 JVMWrapper("JVM_GetClassInterfaces");
1057 JvmtiVMObjectAllocEventCollector oam;
1058 oop mirror = JNIHandles::resolve_non_null(cls);
1059
1060 // Special handling for primitive objects
1061 if (java_lang_Class::is_primitive(mirror)) {
1062 // Primitive objects does not have any interfaces
1063 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1064 return (jobjectArray) JNIHandles::make_local(env, r);
1065 }
1066
1067 Klass* klass = java_lang_Class::as_Klass(mirror);
1068 // Figure size of result array
1069 int size;
1070 if (klass->is_instance_klass()) {
1071 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1072 } else {
1073 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1074 size = 2;
1075 }
1076
1077 // Allocate result array
1078 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1079 objArrayHandle result (THREAD, r);
1080 // Fill in result
1081 if (klass->is_instance_klass()) {
1082 // Regular instance klass, fill in all local interfaces
1083 for (int index = 0; index < size; index++) {
1084 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1085 result->obj_at_put(index, k->java_mirror());
1086 }
1087 } else {
1088 // All arrays implement java.lang.Cloneable and java.io.Serializable
1089 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1090 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1091 }
1092 return (jobjectArray) JNIHandles::make_local(env, result());
1093 JVM_END
1094
1095
1096 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1097 JVMWrapper("JVM_IsInterface");
1098 oop mirror = JNIHandles::resolve_non_null(cls);
1099 if (java_lang_Class::is_primitive(mirror)) {
1100 return JNI_FALSE;
1101 }
1102 Klass* k = java_lang_Class::as_Klass(mirror);
1103 jboolean result = k->is_interface();
1104 assert(!result || k->is_instance_klass(),
1105 "all interfaces are instance types");
1106 // The compiler intrinsic for isInterface tests the
1107 // Klass::_access_flags bits in the same way.
1108 return result;
1109 JVM_END
1110
1111
1112 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1113 JVMWrapper("JVM_GetClassSigners");
1114 JvmtiVMObjectAllocEventCollector oam;
1115 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1116 // There are no signers for primitive types
1117 return NULL;
1118 }
1119
1120 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1121
1122 // If there are no signers set in the class, or if the class
1123 // is an array, return NULL.
1124 if (signers == NULL) return NULL;
1125
1126 // copy of the signers array
1127 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1128 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1129 for (int index = 0; index < signers->length(); index++) {
1130 signers_copy->obj_at_put(index, signers->obj_at(index));
1131 }
1132
1133 // return the copy
1134 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1135 JVM_END
1136
1137
1138 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1139 JVMWrapper("JVM_SetClassSigners");
1140 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1141 // This call is ignored for primitive types and arrays.
1142 // Signers are only set once, ClassLoader.java, and thus shouldn't
1143 // be called with an array. Only the bootstrap loader creates arrays.
1144 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1145 if (k->is_instance_klass()) {
1146 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1147 }
1148 }
1149 JVM_END
1150
1151
1152 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1153 JVMWrapper("JVM_GetProtectionDomain");
1154 if (JNIHandles::resolve(cls) == NULL) {
1155 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1156 }
1157
1158 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1159 // Primitive types does not have a protection domain.
1160 return NULL;
1161 }
1162
1163 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1164 return (jobject) JNIHandles::make_local(env, pd);
1165 JVM_END
1166
1167
1168 // Returns the inherited_access_control_context field of the running thread.
1169 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1170 JVMWrapper("JVM_GetInheritedAccessControlContext");
1171 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1172 return JNIHandles::make_local(env, result);
1173 JVM_END
1174
1175 class RegisterArrayForGC {
1176 private:
1177 JavaThread *_thread;
1178 public:
1179 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1180 _thread = thread;
1181 _thread->register_array_for_gc(array);
1182 }
1183
1184 ~RegisterArrayForGC() {
1185 _thread->register_array_for_gc(NULL);
1186 }
1187 };
1188
1189
1190 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1191 JVMWrapper("JVM_GetStackAccessControlContext");
1192 if (!UsePrivilegedStack) return NULL;
1193
1194 ResourceMark rm(THREAD);
1195 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1196 JvmtiVMObjectAllocEventCollector oam;
1197
1198 // count the protection domains on the execution stack. We collapse
1199 // duplicate consecutive protection domains into a single one, as
1200 // well as stopping when we hit a privileged frame.
1201
1202 oop previous_protection_domain = NULL;
1203 Handle privileged_context(thread, NULL);
1204 bool is_privileged = false;
1205 oop protection_domain = NULL;
1206
1207 // Iterate through Java frames
1208 RegisterMap reg_map(thread);
1209 javaVFrame *vf = thread->last_java_vframe(®_map);
1210 for (; vf != NULL; vf = vf->java_sender()) {
1211 // get method of frame
1212 Method* method = vf->method();
1213
1214 // stop at the first privileged frame
1215 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1216 method->name() == vmSymbols::executePrivileged_name())
1217 {
1218 // this frame is privileged
1219 is_privileged = true;
1220
1221 javaVFrame *priv = vf; // executePrivileged
1222 javaVFrame *caller_fr = priv->java_sender(); // doPrivileged
1223 caller_fr = caller_fr->java_sender(); // caller
1224
1225 StackValueCollection* locals = priv->locals();
1226 privileged_context = locals->obj_at(1);
1227 Handle caller = locals->obj_at(2);
1228
1229 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1230 protection_domain = caller_klass->protection_domain();
1231 } else {
1232 protection_domain = method->method_holder()->protection_domain();
1233 }
1234
1235 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) {
1236 local_array->push(protection_domain);
1237 previous_protection_domain = protection_domain;
1238 }
1239
1240 if (is_privileged) break;
1241 }
1242
1243
1244 // either all the domains on the stack were system domains, or
1245 // we had a privileged system domain
1246 if (local_array->is_empty()) {
1247 if (is_privileged && privileged_context.is_null()) return NULL;
1248
1249 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1250 return JNIHandles::make_local(env, result);
1251 }
1252
1253 // the resource area must be registered in case of a gc
1254 RegisterArrayForGC ragc(thread, local_array);
1255 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1256 local_array->length(), CHECK_NULL);
1257 objArrayHandle h_context(thread, context);
1258 for (int index = 0; index < local_array->length(); index++) {
1259 h_context->obj_at_put(index, local_array->at(index));
1260 }
1261
1262 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1263
1264 return JNIHandles::make_local(env, result);
1265 JVM_END
1266
1267
1268 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1269 JVMWrapper("JVM_IsArrayClass");
1270 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1271 return (k != NULL) && k->is_array_klass() ? true : false;
1272 JVM_END
1273
1274
1275 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1276 JVMWrapper("JVM_IsPrimitiveClass");
1277 oop mirror = JNIHandles::resolve_non_null(cls);
1278 return (jboolean) java_lang_Class::is_primitive(mirror);
1279 JVM_END
1280
1281
1282 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1283 JVMWrapper("JVM_GetClassModifiers");
1284 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1285 // Primitive type
1286 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1287 }
1288
1289 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1290 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1291 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1292 return k->modifier_flags();
1293 JVM_END
1294
1295
1296 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1297
1298 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1299 JvmtiVMObjectAllocEventCollector oam;
1300 // ofClass is a reference to a java_lang_Class object. The mirror object
1301 // of an InstanceKlass
1302
1303 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1304 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1305 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1306 return (jobjectArray)JNIHandles::make_local(env, result);
1307 }
1308
1309 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1310 InnerClassesIterator iter(k);
1311
1312 if (iter.length() == 0) {
1313 // Neither an inner nor outer class
1314 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1315 return (jobjectArray)JNIHandles::make_local(env, result);
1316 }
1317
1318 // find inner class info
1319 constantPoolHandle cp(thread, k->constants());
1320 int length = iter.length();
1321
1322 // Allocate temp. result array
1323 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1324 objArrayHandle result (THREAD, r);
1325 int members = 0;
1326
1327 for (; !iter.done(); iter.next()) {
1328 int ioff = iter.inner_class_info_index();
1329 int ooff = iter.outer_class_info_index();
1330
1331 if (ioff != 0 && ooff != 0) {
1332 // Check to see if the name matches the class we're looking for
1333 // before attempting to find the class.
1334 if (cp->klass_name_at_matches(k, ooff)) {
1335 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1336 if (outer_klass == k) {
1337 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1338 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1339
1340 // Throws an exception if outer klass has not declared k as
1341 // an inner klass
1342 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1343
1344 result->obj_at_put(members, inner_klass->java_mirror());
1345 members++;
1346 }
1347 }
1348 }
1349 }
1350
1351 if (members != length) {
1352 // Return array of right length
1353 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1354 for(int i = 0; i < members; i++) {
1355 res->obj_at_put(i, result->obj_at(i));
1356 }
1357 return (jobjectArray)JNIHandles::make_local(env, res);
1358 }
1359
1360 return (jobjectArray)JNIHandles::make_local(env, result());
1361 JVM_END
1362
1363
1364 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1365 {
1366 // ofClass is a reference to a java_lang_Class object.
1367 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1368 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1369 return NULL;
1370 }
1371
1372 bool inner_is_member = false;
1373 Klass* outer_klass
1374 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1375 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1376 if (outer_klass == NULL) return NULL; // already a top-level class
1377 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1378 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1379 }
1380 JVM_END
1381
1382 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1383 {
1384 oop mirror = JNIHandles::resolve_non_null(cls);
1385 if (java_lang_Class::is_primitive(mirror) ||
1386 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1387 return NULL;
1388 }
1389 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1390 int ooff = 0, noff = 0;
1391 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1392 if (noff != 0) {
1393 constantPoolHandle i_cp(thread, k->constants());
1394 Symbol* name = i_cp->symbol_at(noff);
1395 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1396 return (jstring) JNIHandles::make_local(env, str());
1397 }
1398 }
1399 return NULL;
1400 }
1401 JVM_END
1402
1403 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1404 assert (cls != NULL, "illegal class");
1405 JVMWrapper("JVM_GetClassSignature");
1406 JvmtiVMObjectAllocEventCollector oam;
1407 ResourceMark rm(THREAD);
1408 // Return null for arrays and primatives
1409 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1410 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1411 if (k->is_instance_klass()) {
1412 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1413 if (sym == NULL) return NULL;
1414 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1415 return (jstring) JNIHandles::make_local(env, str());
1416 }
1417 }
1418 return NULL;
1419 JVM_END
1420
1421
1422 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1423 assert (cls != NULL, "illegal class");
1424 JVMWrapper("JVM_GetClassAnnotations");
1425
1426 // Return null for arrays and primitives
1427 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1428 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1429 if (k->is_instance_klass()) {
1430 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1431 return (jbyteArray) JNIHandles::make_local(env, a);
1432 }
1433 }
1434 return NULL;
1435 JVM_END
1436
1437
1438 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1439 // some of this code was adapted from from jni_FromReflectedField
1440
1441 oop reflected = JNIHandles::resolve_non_null(field);
1442 oop mirror = java_lang_reflect_Field::clazz(reflected);
1443 Klass* k = java_lang_Class::as_Klass(mirror);
1444 int slot = java_lang_reflect_Field::slot(reflected);
1445 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1446
1447 InstanceKlass* ik = InstanceKlass::cast(k);
1448 intptr_t offset = ik->field_offset(slot);
1449
1450 if (modifiers & JVM_ACC_STATIC) {
1451 // for static fields we only look in the current class
1452 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1453 assert(false, "cannot find static field");
1454 return false;
1455 }
1456 } else {
1457 // for instance fields we start with the current class and work
1458 // our way up through the superclass chain
1459 if (!ik->find_field_from_offset(offset, false, &fd)) {
1460 assert(false, "cannot find instance field");
1461 return false;
1462 }
1463 }
1464 return true;
1465 }
1466
1467 static Method* jvm_get_method_common(jobject method) {
1468 // some of this code was adapted from from jni_FromReflectedMethod
1469
1470 oop reflected = JNIHandles::resolve_non_null(method);
1471 oop mirror = NULL;
1472 int slot = 0;
1473
1474 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1475 mirror = java_lang_reflect_Constructor::clazz(reflected);
1476 slot = java_lang_reflect_Constructor::slot(reflected);
1477 } else {
1478 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1479 "wrong type");
1480 mirror = java_lang_reflect_Method::clazz(reflected);
1481 slot = java_lang_reflect_Method::slot(reflected);
1482 }
1483 Klass* k = java_lang_Class::as_Klass(mirror);
1484
1485 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1486 assert(m != NULL, "cannot find method");
1487 return m; // caller has to deal with NULL in product mode
1488 }
1489
1490 /* Type use annotations support (JDK 1.8) */
1491
1492 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1493 assert (cls != NULL, "illegal class");
1494 JVMWrapper("JVM_GetClassTypeAnnotations");
1495 ResourceMark rm(THREAD);
1496 // Return null for arrays and primitives
1497 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1498 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1499 if (k->is_instance_klass()) {
1500 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1501 if (type_annotations != NULL) {
1502 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1503 return (jbyteArray) JNIHandles::make_local(env, a);
1504 }
1505 }
1506 }
1507 return NULL;
1508 JVM_END
1509
1510 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1511 assert (method != NULL, "illegal method");
1512 JVMWrapper("JVM_GetMethodTypeAnnotations");
1513
1514 // method is a handle to a java.lang.reflect.Method object
1515 Method* m = jvm_get_method_common(method);
1516 if (m == NULL) {
1517 return NULL;
1518 }
1519
1520 AnnotationArray* type_annotations = m->type_annotations();
1521 if (type_annotations != NULL) {
1522 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1523 return (jbyteArray) JNIHandles::make_local(env, a);
1524 }
1525
1526 return NULL;
1527 JVM_END
1528
1529 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1530 assert (field != NULL, "illegal field");
1531 JVMWrapper("JVM_GetFieldTypeAnnotations");
1532
1533 fieldDescriptor fd;
1534 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1535 if (!gotFd) {
1536 return NULL;
1537 }
1538
1539 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1540 JVM_END
1541
1542 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1543 if (!cp->is_within_bounds(index)) {
1544 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1545 }
1546 }
1547
1548 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1549 {
1550 JVMWrapper("JVM_GetMethodParameters");
1551 // method is a handle to a java.lang.reflect.Method object
1552 Method* method_ptr = jvm_get_method_common(method);
1553 methodHandle mh (THREAD, method_ptr);
1554 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1555 const int num_params = mh->method_parameters_length();
1556
1557 if (num_params < 0) {
1558 // A -1 return value from method_parameters_length means there is no
1559 // parameter data. Return null to indicate this to the reflection
1560 // API.
1561 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1562 return (jobjectArray)NULL;
1563 } else {
1564 // Otherwise, we return something up to reflection, even if it is
1565 // a zero-length array. Why? Because in some cases this can
1566 // trigger a MalformedParametersException.
1567
1568 // make sure all the symbols are properly formatted
1569 for (int i = 0; i < num_params; i++) {
1570 MethodParametersElement* params = mh->method_parameters_start();
1571 int index = params[i].name_cp_index;
1572 bounds_check(mh->constants(), index, CHECK_NULL);
1573
1574 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1575 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1576 "Wrong type at constant pool index");
1577 }
1578
1579 }
1580
1581 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1582 objArrayHandle result (THREAD, result_oop);
1583
1584 for (int i = 0; i < num_params; i++) {
1585 MethodParametersElement* params = mh->method_parameters_start();
1586 // For a 0 index, give a NULL symbol
1587 Symbol* sym = 0 != params[i].name_cp_index ?
1588 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1589 int flags = params[i].flags;
1590 oop param = Reflection::new_parameter(reflected_method, i, sym,
1591 flags, CHECK_NULL);
1592 result->obj_at_put(i, param);
1593 }
1594 return (jobjectArray)JNIHandles::make_local(env, result());
1595 }
1596 }
1597 JVM_END
1598
1599 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1600
1601 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1602 {
1603 JVMWrapper("JVM_GetClassDeclaredFields");
1604 JvmtiVMObjectAllocEventCollector oam;
1605
1606 // Exclude primitive types and array types
1607 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1608 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1609 // Return empty array
1610 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1611 return (jobjectArray) JNIHandles::make_local(env, res);
1612 }
1613
1614 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1615 constantPoolHandle cp(THREAD, k->constants());
1616
1617 // Ensure class is linked
1618 k->link_class(CHECK_NULL);
1619
1620 // Allocate result
1621 int num_fields;
1622
1623 if (publicOnly) {
1624 num_fields = 0;
1625 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1626 if (fs.access_flags().is_public()) ++num_fields;
1627 }
1628 } else {
1629 num_fields = k->java_fields_count();
1630 }
1631
1632 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1633 objArrayHandle result (THREAD, r);
1634
1635 int out_idx = 0;
1636 fieldDescriptor fd;
1637 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1638 if (!publicOnly || fs.access_flags().is_public()) {
1639 fd.reinitialize(k, fs.index());
1640 oop field = Reflection::new_field(&fd, CHECK_NULL);
1641 result->obj_at_put(out_idx, field);
1642 ++out_idx;
1643 }
1644 }
1645 assert(out_idx == num_fields, "just checking");
1646 return (jobjectArray) JNIHandles::make_local(env, result());
1647 }
1648 JVM_END
1649
1650 static bool select_method(const methodHandle& method, bool want_constructor) {
1651 if (want_constructor) {
1652 return (method->is_initializer() && !method->is_static());
1653 } else {
1654 return (!method->is_initializer() && !method->is_overpass());
1655 }
1656 }
1657
1658 static jobjectArray get_class_declared_methods_helper(
1659 JNIEnv *env,
1660 jclass ofClass, jboolean publicOnly,
1661 bool want_constructor,
1662 Klass* klass, TRAPS) {
1663
1664 JvmtiVMObjectAllocEventCollector oam;
1665
1666 // Exclude primitive types and array types
1667 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1668 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1669 // Return empty array
1670 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1671 return (jobjectArray) JNIHandles::make_local(env, res);
1672 }
1673
1674 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1675
1676 // Ensure class is linked
1677 k->link_class(CHECK_NULL);
1678
1679 Array<Method*>* methods = k->methods();
1680 int methods_length = methods->length();
1681
1682 // Save original method_idnum in case of redefinition, which can change
1683 // the idnum of obsolete methods. The new method will have the same idnum
1684 // but if we refresh the methods array, the counts will be wrong.
1685 ResourceMark rm(THREAD);
1686 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1687 int num_methods = 0;
1688
1689 for (int i = 0; i < methods_length; i++) {
1690 methodHandle method(THREAD, methods->at(i));
1691 if (select_method(method, want_constructor)) {
1692 if (!publicOnly || method->is_public()) {
1693 idnums->push(method->method_idnum());
1694 ++num_methods;
1695 }
1696 }
1697 }
1698
1699 // Allocate result
1700 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1701 objArrayHandle result (THREAD, r);
1702
1703 // Now just put the methods that we selected above, but go by their idnum
1704 // in case of redefinition. The methods can be redefined at any safepoint,
1705 // so above when allocating the oop array and below when creating reflect
1706 // objects.
1707 for (int i = 0; i < num_methods; i++) {
1708 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1709 if (method.is_null()) {
1710 // Method may have been deleted and seems this API can handle null
1711 // Otherwise should probably put a method that throws NSME
1712 result->obj_at_put(i, NULL);
1713 } else {
1714 oop m;
1715 if (want_constructor) {
1716 m = Reflection::new_constructor(method, CHECK_NULL);
1717 } else {
1718 m = Reflection::new_method(method, false, CHECK_NULL);
1719 }
1720 result->obj_at_put(i, m);
1721 }
1722 }
1723
1724 return (jobjectArray) JNIHandles::make_local(env, result());
1725 }
1726
1727 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1728 {
1729 JVMWrapper("JVM_GetClassDeclaredMethods");
1730 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1731 /*want_constructor*/ false,
1732 SystemDictionary::reflect_Method_klass(), THREAD);
1733 }
1734 JVM_END
1735
1736 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1737 {
1738 JVMWrapper("JVM_GetClassDeclaredConstructors");
1739 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1740 /*want_constructor*/ true,
1741 SystemDictionary::reflect_Constructor_klass(), THREAD);
1742 }
1743 JVM_END
1744
1745 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1746 {
1747 JVMWrapper("JVM_GetClassAccessFlags");
1748 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1749 // Primitive type
1750 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1751 }
1752
1753 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1754 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1755 }
1756 JVM_END
1757
1758 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1759 {
1760 JVMWrapper("JVM_AreNestMates");
1761 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1762 assert(c->is_instance_klass(), "must be");
1763 InstanceKlass* ck = InstanceKlass::cast(c);
1764 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1765 assert(m->is_instance_klass(), "must be");
1766 InstanceKlass* mk = InstanceKlass::cast(m);
1767 return ck->has_nestmate_access_to(mk, THREAD);
1768 }
1769 JVM_END
1770
1771 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1772 {
1773 // current is not a primitive or array class
1774 JVMWrapper("JVM_GetNestHost");
1775 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1776 assert(c->is_instance_klass(), "must be");
1777 InstanceKlass* ck = InstanceKlass::cast(c);
1778 // Don't post exceptions if validation fails
1779 InstanceKlass* host = ck->nest_host(NULL, THREAD);
1780 return (jclass) (host == NULL ? NULL :
1781 JNIHandles::make_local(THREAD, host->java_mirror()));
1782 }
1783 JVM_END
1784
1785 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1786 {
1787 // current is not a primitive or array class
1788 JVMWrapper("JVM_GetNestMembers");
1789 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1790 assert(c->is_instance_klass(), "must be");
1791 InstanceKlass* ck = InstanceKlass::cast(c);
1792 // Get the nest host for this nest - throw ICCE if validation fails
1793 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
1794 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
1795
1796 {
1797 JvmtiVMObjectAllocEventCollector oam;
1798 Array<u2>* members = host->nest_members();
1799 int length = members == NULL ? 0 : members->length();
1800 // nest host is first in the array so make it one bigger
1801 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
1802 length + 1, CHECK_NULL);
1803 objArrayHandle result (THREAD, r);
1804 result->obj_at_put(0, host->java_mirror());
1805 if (length != 0) {
1806 int i;
1807 for (i = 0; i < length; i++) {
1808 int cp_index = members->at(i);
1809 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
1810 if (k->is_instance_klass()) {
1811 InstanceKlass* nest_host_k =
1812 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
1813 if (nest_host_k == host) {
1814 result->obj_at_put(i+1, k->java_mirror());
1815 }
1816 else {
1817 // k's nest host is legal but it isn't our host so
1818 // throw ICCE
1819 ResourceMark rm(THREAD);
1820 Exceptions::fthrow(THREAD_AND_LOCATION,
1821 icce,
1822 "Nest member %s in %s declares a different nest host of %s",
1823 k->external_name(),
1824 host->external_name(),
1825 nest_host_k->external_name()
1826 );
1827 return NULL;
1828 }
1829 }
1830 else {
1831 // we have a bad nest member entry - throw ICCE
1832 ResourceMark rm(THREAD);
1833 Exceptions::fthrow(THREAD_AND_LOCATION,
1834 icce,
1835 "Class %s can not be a nest member of %s",
1836 k->external_name(),
1837 host->external_name()
1838 );
1839 return NULL;
1840 }
1841 }
1842 }
1843 else {
1844 assert(host == ck, "must be singleton nest");
1845 }
1846 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1847 }
1848 }
1849 JVM_END
1850
1851 // Constant pool access //////////////////////////////////////////////////////////
1852
1853 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1854 {
1855 JVMWrapper("JVM_GetClassConstantPool");
1856 JvmtiVMObjectAllocEventCollector oam;
1857
1858 // Return null for primitives and arrays
1859 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1860 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1861 if (k->is_instance_klass()) {
1862 InstanceKlass* k_h = InstanceKlass::cast(k);
1863 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1864 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1865 return JNIHandles::make_local(jcp());
1866 }
1867 }
1868 return NULL;
1869 }
1870 JVM_END
1871
1872
1873 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1874 {
1875 JVMWrapper("JVM_ConstantPoolGetSize");
1876 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1877 return cp->length();
1878 }
1879 JVM_END
1880
1881
1882 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1883 {
1884 JVMWrapper("JVM_ConstantPoolGetClassAt");
1885 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1886 bounds_check(cp, index, CHECK_NULL);
1887 constantTag tag = cp->tag_at(index);
1888 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1889 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1890 }
1891 Klass* k = cp->klass_at(index, CHECK_NULL);
1892 return (jclass) JNIHandles::make_local(k->java_mirror());
1893 }
1894 JVM_END
1895
1896 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1897 {
1898 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1899 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1900 bounds_check(cp, index, CHECK_NULL);
1901 constantTag tag = cp->tag_at(index);
1902 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1903 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1904 }
1905 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1906 if (k == NULL) return NULL;
1907 return (jclass) JNIHandles::make_local(k->java_mirror());
1908 }
1909 JVM_END
1910
1911 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1912 constantTag tag = cp->tag_at(index);
1913 if (!tag.is_method() && !tag.is_interface_method()) {
1914 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1915 }
1916 int klass_ref = cp->uncached_klass_ref_index_at(index);
1917 Klass* k_o;
1918 if (force_resolution) {
1919 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1920 } else {
1921 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1922 if (k_o == NULL) return NULL;
1923 }
1924 InstanceKlass* k = InstanceKlass::cast(k_o);
1925 Symbol* name = cp->uncached_name_ref_at(index);
1926 Symbol* sig = cp->uncached_signature_ref_at(index);
1927 methodHandle m (THREAD, k->find_method(name, sig));
1928 if (m.is_null()) {
1929 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1930 }
1931 oop method;
1932 if (!m->is_initializer() || m->is_static()) {
1933 method = Reflection::new_method(m, true, CHECK_NULL);
1934 } else {
1935 method = Reflection::new_constructor(m, CHECK_NULL);
1936 }
1937 return JNIHandles::make_local(method);
1938 }
1939
1940 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1941 {
1942 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1943 JvmtiVMObjectAllocEventCollector oam;
1944 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1945 bounds_check(cp, index, CHECK_NULL);
1946 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1947 return res;
1948 }
1949 JVM_END
1950
1951 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1952 {
1953 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1954 JvmtiVMObjectAllocEventCollector oam;
1955 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1956 bounds_check(cp, index, CHECK_NULL);
1957 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1958 return res;
1959 }
1960 JVM_END
1961
1962 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1963 constantTag tag = cp->tag_at(index);
1964 if (!tag.is_field()) {
1965 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1966 }
1967 int klass_ref = cp->uncached_klass_ref_index_at(index);
1968 Klass* k_o;
1969 if (force_resolution) {
1970 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1971 } else {
1972 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1973 if (k_o == NULL) return NULL;
1974 }
1975 InstanceKlass* k = InstanceKlass::cast(k_o);
1976 Symbol* name = cp->uncached_name_ref_at(index);
1977 Symbol* sig = cp->uncached_signature_ref_at(index);
1978 fieldDescriptor fd;
1979 Klass* target_klass = k->find_field(name, sig, &fd);
1980 if (target_klass == NULL) {
1981 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
1982 }
1983 oop field = Reflection::new_field(&fd, CHECK_NULL);
1984 return JNIHandles::make_local(field);
1985 }
1986
1987 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
1988 {
1989 JVMWrapper("JVM_ConstantPoolGetFieldAt");
1990 JvmtiVMObjectAllocEventCollector oam;
1991 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1992 bounds_check(cp, index, CHECK_NULL);
1993 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
1994 return res;
1995 }
1996 JVM_END
1997
1998 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1999 {
2000 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2001 JvmtiVMObjectAllocEventCollector oam;
2002 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2003 bounds_check(cp, index, CHECK_NULL);
2004 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2005 return res;
2006 }
2007 JVM_END
2008
2009 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2010 {
2011 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2012 JvmtiVMObjectAllocEventCollector oam;
2013 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2014 bounds_check(cp, index, CHECK_NULL);
2015 constantTag tag = cp->tag_at(index);
2016 if (!tag.is_field_or_method()) {
2017 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2018 }
2019 int klass_ref = cp->uncached_klass_ref_index_at(index);
2020 Symbol* klass_name = cp->klass_name_at(klass_ref);
2021 Symbol* member_name = cp->uncached_name_ref_at(index);
2022 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2023 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2024 objArrayHandle dest(THREAD, dest_o);
2025 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2026 dest->obj_at_put(0, str());
2027 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2028 dest->obj_at_put(1, str());
2029 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2030 dest->obj_at_put(2, str());
2031 return (jobjectArray) JNIHandles::make_local(dest());
2032 }
2033 JVM_END
2034
2035 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2036 {
2037 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2038 JvmtiVMObjectAllocEventCollector oam;
2039 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2040 bounds_check(cp, index, CHECK_0);
2041 constantTag tag = cp->tag_at(index);
2042 if (!tag.is_field_or_method()) {
2043 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2044 }
2045 return (jint) cp->uncached_klass_ref_index_at(index);
2046 }
2047 JVM_END
2048
2049 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2050 {
2051 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2052 JvmtiVMObjectAllocEventCollector oam;
2053 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2054 bounds_check(cp, index, CHECK_0);
2055 constantTag tag = cp->tag_at(index);
2056 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2057 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2058 }
2059 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2060 }
2061 JVM_END
2062
2063 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2064 {
2065 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2066 JvmtiVMObjectAllocEventCollector oam;
2067 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2068 bounds_check(cp, index, CHECK_NULL);
2069 constantTag tag = cp->tag_at(index);
2070 if (!tag.is_name_and_type()) {
2071 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2072 }
2073 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2074 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2075 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2076 objArrayHandle dest(THREAD, dest_o);
2077 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2078 dest->obj_at_put(0, str());
2079 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2080 dest->obj_at_put(1, str());
2081 return (jobjectArray) JNIHandles::make_local(dest());
2082 }
2083 JVM_END
2084
2085 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2086 {
2087 JVMWrapper("JVM_ConstantPoolGetIntAt");
2088 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2089 bounds_check(cp, index, CHECK_0);
2090 constantTag tag = cp->tag_at(index);
2091 if (!tag.is_int()) {
2092 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2093 }
2094 return cp->int_at(index);
2095 }
2096 JVM_END
2097
2098 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2099 {
2100 JVMWrapper("JVM_ConstantPoolGetLongAt");
2101 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2102 bounds_check(cp, index, CHECK_(0L));
2103 constantTag tag = cp->tag_at(index);
2104 if (!tag.is_long()) {
2105 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2106 }
2107 return cp->long_at(index);
2108 }
2109 JVM_END
2110
2111 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2112 {
2113 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2114 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2115 bounds_check(cp, index, CHECK_(0.0f));
2116 constantTag tag = cp->tag_at(index);
2117 if (!tag.is_float()) {
2118 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2119 }
2120 return cp->float_at(index);
2121 }
2122 JVM_END
2123
2124 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2125 {
2126 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2127 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2128 bounds_check(cp, index, CHECK_(0.0));
2129 constantTag tag = cp->tag_at(index);
2130 if (!tag.is_double()) {
2131 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2132 }
2133 return cp->double_at(index);
2134 }
2135 JVM_END
2136
2137 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2138 {
2139 JVMWrapper("JVM_ConstantPoolGetStringAt");
2140 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2141 bounds_check(cp, index, CHECK_NULL);
2142 constantTag tag = cp->tag_at(index);
2143 if (!tag.is_string()) {
2144 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2145 }
2146 oop str = cp->string_at(index, CHECK_NULL);
2147 return (jstring) JNIHandles::make_local(str);
2148 }
2149 JVM_END
2150
2151 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2152 {
2153 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2154 JvmtiVMObjectAllocEventCollector oam;
2155 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2156 bounds_check(cp, index, CHECK_NULL);
2157 constantTag tag = cp->tag_at(index);
2158 if (!tag.is_symbol()) {
2159 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2160 }
2161 Symbol* sym = cp->symbol_at(index);
2162 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2163 return (jstring) JNIHandles::make_local(str());
2164 }
2165 JVM_END
2166
2167 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2168 {
2169 JVMWrapper("JVM_ConstantPoolGetTagAt");
2170 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2171 bounds_check(cp, index, CHECK_0);
2172 constantTag tag = cp->tag_at(index);
2173 jbyte result = tag.value();
2174 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2175 // they are changed to the corresponding tags from the JVM spec, so that java code in
2176 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2177 if (tag.is_klass_or_reference()) {
2178 result = JVM_CONSTANT_Class;
2179 } else if (tag.is_string_index()) {
2180 result = JVM_CONSTANT_String;
2181 } else if (tag.is_method_type_in_error()) {
2182 result = JVM_CONSTANT_MethodType;
2183 } else if (tag.is_method_handle_in_error()) {
2184 result = JVM_CONSTANT_MethodHandle;
2185 } else if (tag.is_dynamic_constant_in_error()) {
2186 result = JVM_CONSTANT_Dynamic;
2187 }
2188 return result;
2189 }
2190 JVM_END
2191
2192 // Assertion support. //////////////////////////////////////////////////////////
2193
2194 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2195 JVMWrapper("JVM_DesiredAssertionStatus");
2196 assert(cls != NULL, "bad class");
2197
2198 oop r = JNIHandles::resolve(cls);
2199 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2200 if (java_lang_Class::is_primitive(r)) return false;
2201
2202 Klass* k = java_lang_Class::as_Klass(r);
2203 assert(k->is_instance_klass(), "must be an instance klass");
2204 if (!k->is_instance_klass()) return false;
2205
2206 ResourceMark rm(THREAD);
2207 const char* name = k->name()->as_C_string();
2208 bool system_class = k->class_loader() == NULL;
2209 return JavaAssertions::enabled(name, system_class);
2210
2211 JVM_END
2212
2213
2214 // Return a new AssertionStatusDirectives object with the fields filled in with
2215 // command-line assertion arguments (i.e., -ea, -da).
2216 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2217 JVMWrapper("JVM_AssertionStatusDirectives");
2218 JvmtiVMObjectAllocEventCollector oam;
2219 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2220 return JNIHandles::make_local(env, asd);
2221 JVM_END
2222
2223 // Verification ////////////////////////////////////////////////////////////////////////////////
2224
2225 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2226
2227 // RedefineClasses support: bug 6214132 caused verification to fail.
2228 // All functions from this section should call the jvmtiThreadSate function:
2229 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2230 // The function returns a Klass* of the _scratch_class if the verifier
2231 // was invoked in the middle of the class redefinition.
2232 // Otherwise it returns its argument value which is the _the_class Klass*.
2233 // Please, refer to the description in the jvmtiThreadSate.hpp.
2234
2235 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2236 JVMWrapper("JVM_GetClassNameUTF");
2237 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2238 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2239 return k->name()->as_utf8();
2240 JVM_END
2241
2242
2243 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2244 JVMWrapper("JVM_GetClassCPTypes");
2245 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2246 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2247 // types will have length zero if this is not an InstanceKlass
2248 // (length is determined by call to JVM_GetClassCPEntriesCount)
2249 if (k->is_instance_klass()) {
2250 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2251 for (int index = cp->length() - 1; index >= 0; index--) {
2252 constantTag tag = cp->tag_at(index);
2253 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2254 }
2255 }
2256 JVM_END
2257
2258
2259 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2260 JVMWrapper("JVM_GetClassCPEntriesCount");
2261 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2262 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2263 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2264 JVM_END
2265
2266
2267 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2268 JVMWrapper("JVM_GetClassFieldsCount");
2269 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2270 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2271 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2272 JVM_END
2273
2274
2275 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2276 JVMWrapper("JVM_GetClassMethodsCount");
2277 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2278 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2279 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2280 JVM_END
2281
2282
2283 // The following methods, used for the verifier, are never called with
2284 // array klasses, so a direct cast to InstanceKlass is safe.
2285 // Typically, these methods are called in a loop with bounds determined
2286 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2287 // zero for arrays.
2288 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2289 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2290 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2291 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2292 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2293 int length = method->checked_exceptions_length();
2294 if (length > 0) {
2295 CheckedExceptionElement* table= method->checked_exceptions_start();
2296 for (int i = 0; i < length; i++) {
2297 exceptions[i] = table[i].class_cp_index;
2298 }
2299 }
2300 JVM_END
2301
2302
2303 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2304 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2305 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2306 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2307 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2308 return method->checked_exceptions_length();
2309 JVM_END
2310
2311
2312 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2313 JVMWrapper("JVM_GetMethodIxByteCode");
2314 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2315 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2316 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2317 memcpy(code, method->code_base(), method->code_size());
2318 JVM_END
2319
2320
2321 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2322 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2323 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2324 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2325 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2326 return method->code_size();
2327 JVM_END
2328
2329
2330 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2331 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2332 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2333 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2334 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2335 ExceptionTable extable(method);
2336 entry->start_pc = extable.start_pc(entry_index);
2337 entry->end_pc = extable.end_pc(entry_index);
2338 entry->handler_pc = extable.handler_pc(entry_index);
2339 entry->catchType = extable.catch_type_index(entry_index);
2340 JVM_END
2341
2342
2343 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2344 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2345 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2346 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2347 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2348 return method->exception_table_length();
2349 JVM_END
2350
2351
2352 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2353 JVMWrapper("JVM_GetMethodIxModifiers");
2354 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2355 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2356 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2357 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2358 JVM_END
2359
2360
2361 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2362 JVMWrapper("JVM_GetFieldIxModifiers");
2363 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2364 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2365 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2366 JVM_END
2367
2368
2369 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2370 JVMWrapper("JVM_GetMethodIxLocalsCount");
2371 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2372 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2373 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2374 return method->max_locals();
2375 JVM_END
2376
2377
2378 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2379 JVMWrapper("JVM_GetMethodIxArgsSize");
2380 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2381 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2382 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2383 return method->size_of_parameters();
2384 JVM_END
2385
2386
2387 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2388 JVMWrapper("JVM_GetMethodIxMaxStack");
2389 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2390 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2391 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2392 return method->verifier_max_stack();
2393 JVM_END
2394
2395
2396 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2397 JVMWrapper("JVM_IsConstructorIx");
2398 ResourceMark rm(THREAD);
2399 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2400 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2401 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2402 return method->name() == vmSymbols::object_initializer_name();
2403 JVM_END
2404
2405
2406 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2407 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2408 ResourceMark rm(THREAD);
2409 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2410 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2411 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2412 return method->is_overpass();
2413 JVM_END
2414
2415 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2416 JVMWrapper("JVM_GetMethodIxIxUTF");
2417 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2418 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2419 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2420 return method->name()->as_utf8();
2421 JVM_END
2422
2423
2424 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2425 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2426 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2427 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2428 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2429 return method->signature()->as_utf8();
2430 JVM_END
2431
2432 /**
2433 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2434 * read entries in the constant pool. Since the old verifier always
2435 * works on a copy of the code, it will not see any rewriting that
2436 * may possibly occur in the middle of verification. So it is important
2437 * that nothing it calls tries to use the cpCache instead of the raw
2438 * constant pool, so we must use cp->uncached_x methods when appropriate.
2439 */
2440 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2441 JVMWrapper("JVM_GetCPFieldNameUTF");
2442 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2443 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2444 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2445 switch (cp->tag_at(cp_index).value()) {
2446 case JVM_CONSTANT_Fieldref:
2447 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2448 default:
2449 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2450 }
2451 ShouldNotReachHere();
2452 return NULL;
2453 JVM_END
2454
2455
2456 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2457 JVMWrapper("JVM_GetCPMethodNameUTF");
2458 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2459 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2460 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2461 switch (cp->tag_at(cp_index).value()) {
2462 case JVM_CONSTANT_InterfaceMethodref:
2463 case JVM_CONSTANT_Methodref:
2464 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2465 default:
2466 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2467 }
2468 ShouldNotReachHere();
2469 return NULL;
2470 JVM_END
2471
2472
2473 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2474 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2475 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2476 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2477 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2478 switch (cp->tag_at(cp_index).value()) {
2479 case JVM_CONSTANT_InterfaceMethodref:
2480 case JVM_CONSTANT_Methodref:
2481 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2482 default:
2483 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2484 }
2485 ShouldNotReachHere();
2486 return NULL;
2487 JVM_END
2488
2489
2490 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2491 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2492 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2493 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2494 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2495 switch (cp->tag_at(cp_index).value()) {
2496 case JVM_CONSTANT_Fieldref:
2497 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2498 default:
2499 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2500 }
2501 ShouldNotReachHere();
2502 return NULL;
2503 JVM_END
2504
2505
2506 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2507 JVMWrapper("JVM_GetCPClassNameUTF");
2508 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2509 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2510 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2511 Symbol* classname = cp->klass_name_at(cp_index);
2512 return classname->as_utf8();
2513 JVM_END
2514
2515
2516 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2517 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2518 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2519 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2520 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2521 switch (cp->tag_at(cp_index).value()) {
2522 case JVM_CONSTANT_Fieldref: {
2523 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2524 Symbol* classname = cp->klass_name_at(class_index);
2525 return classname->as_utf8();
2526 }
2527 default:
2528 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2529 }
2530 ShouldNotReachHere();
2531 return NULL;
2532 JVM_END
2533
2534
2535 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2536 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2537 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2538 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2539 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2540 switch (cp->tag_at(cp_index).value()) {
2541 case JVM_CONSTANT_Methodref:
2542 case JVM_CONSTANT_InterfaceMethodref: {
2543 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2544 Symbol* classname = cp->klass_name_at(class_index);
2545 return classname->as_utf8();
2546 }
2547 default:
2548 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2549 }
2550 ShouldNotReachHere();
2551 return NULL;
2552 JVM_END
2553
2554
2555 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2556 JVMWrapper("JVM_GetCPFieldModifiers");
2557 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2558 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2559 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2560 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2561 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2562 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2563 switch (cp->tag_at(cp_index).value()) {
2564 case JVM_CONSTANT_Fieldref: {
2565 Symbol* name = cp->uncached_name_ref_at(cp_index);
2566 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2567 InstanceKlass* ik = InstanceKlass::cast(k_called);
2568 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2569 if (fs.name() == name && fs.signature() == signature) {
2570 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2571 }
2572 }
2573 return -1;
2574 }
2575 default:
2576 fatal("JVM_GetCPFieldModifiers: illegal constant");
2577 }
2578 ShouldNotReachHere();
2579 return 0;
2580 JVM_END
2581
2582
2583 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2584 JVMWrapper("JVM_GetCPMethodModifiers");
2585 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2586 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2587 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2588 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2589 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2590 switch (cp->tag_at(cp_index).value()) {
2591 case JVM_CONSTANT_Methodref:
2592 case JVM_CONSTANT_InterfaceMethodref: {
2593 Symbol* name = cp->uncached_name_ref_at(cp_index);
2594 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2595 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2596 int methods_count = methods->length();
2597 for (int i = 0; i < methods_count; i++) {
2598 Method* method = methods->at(i);
2599 if (method->name() == name && method->signature() == signature) {
2600 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2601 }
2602 }
2603 return -1;
2604 }
2605 default:
2606 fatal("JVM_GetCPMethodModifiers: illegal constant");
2607 }
2608 ShouldNotReachHere();
2609 return 0;
2610 JVM_END
2611
2612
2613 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2614
2615 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2616 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2617 JVM_END
2618
2619
2620 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2621 JVMWrapper("JVM_IsSameClassPackage");
2622 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2623 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2624 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2625 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2626 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2627 JVM_END
2628
2629 // Printing support //////////////////////////////////////////////////
2630 extern "C" {
2631
2632 ATTRIBUTE_PRINTF(3, 0)
2633 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2634 // Reject count values that are negative signed values converted to
2635 // unsigned; see bug 4399518, 4417214
2636 if ((intptr_t)count <= 0) return -1;
2637
2638 int result = os::vsnprintf(str, count, fmt, args);
2639 if (result > 0 && (size_t)result >= count) {
2640 result = -1;
2641 }
2642
2643 return result;
2644 }
2645
2646 ATTRIBUTE_PRINTF(3, 4)
2647 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2648 va_list args;
2649 int len;
2650 va_start(args, fmt);
2651 len = jio_vsnprintf(str, count, fmt, args);
2652 va_end(args);
2653 return len;
2654 }
2655
2656 ATTRIBUTE_PRINTF(2, 3)
2657 int jio_fprintf(FILE* f, const char *fmt, ...) {
2658 int len;
2659 va_list args;
2660 va_start(args, fmt);
2661 len = jio_vfprintf(f, fmt, args);
2662 va_end(args);
2663 return len;
2664 }
2665
2666 ATTRIBUTE_PRINTF(2, 0)
2667 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2668 if (Arguments::vfprintf_hook() != NULL) {
2669 return Arguments::vfprintf_hook()(f, fmt, args);
2670 } else {
2671 return vfprintf(f, fmt, args);
2672 }
2673 }
2674
2675 ATTRIBUTE_PRINTF(1, 2)
2676 JNIEXPORT int jio_printf(const char *fmt, ...) {
2677 int len;
2678 va_list args;
2679 va_start(args, fmt);
2680 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2681 va_end(args);
2682 return len;
2683 }
2684
2685 // HotSpot specific jio method
2686 void jio_print(const char* s, size_t len) {
2687 // Try to make this function as atomic as possible.
2688 if (Arguments::vfprintf_hook() != NULL) {
2689 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2690 } else {
2691 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2692 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2693 }
2694 }
2695
2696 } // Extern C
2697
2698 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2699
2700 // In most of the JVM thread support functions we need to access the
2701 // thread through a ThreadsListHandle to prevent it from exiting and
2702 // being reclaimed while we try to operate on it. The exceptions to this
2703 // rule are when operating on the current thread, or if the monitor of
2704 // the target java.lang.Thread is locked at the Java level - in both
2705 // cases the target cannot exit.
2706
2707 static void thread_entry(JavaThread* thread, TRAPS) {
2708 HandleMark hm(THREAD);
2709 Handle obj(THREAD, thread->threadObj());
2710 JavaValue result(T_VOID);
2711 JavaCalls::call_virtual(&result,
2712 obj,
2713 SystemDictionary::Thread_klass(),
2714 vmSymbols::run_method_name(),
2715 vmSymbols::void_method_signature(),
2716 THREAD);
2717 }
2718
2719
2720 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2721 JVMWrapper("JVM_StartThread");
2722 JavaThread *native_thread = NULL;
2723
2724 // We cannot hold the Threads_lock when we throw an exception,
2725 // due to rank ordering issues. Example: we might need to grab the
2726 // Heap_lock while we construct the exception.
2727 bool throw_illegal_thread_state = false;
2728
2729 // We must release the Threads_lock before we can post a jvmti event
2730 // in Thread::start.
2731 {
2732 // Ensure that the C++ Thread and OSThread structures aren't freed before
2733 // we operate.
2734 MutexLocker mu(Threads_lock);
2735
2736 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2737 // re-starting an already started thread, so we should usually find
2738 // that the JavaThread is null. However for a JNI attached thread
2739 // there is a small window between the Thread object being created
2740 // (with its JavaThread set) and the update to its threadStatus, so we
2741 // have to check for this
2742 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2743 throw_illegal_thread_state = true;
2744 } else {
2745 // We could also check the stillborn flag to see if this thread was already stopped, but
2746 // for historical reasons we let the thread detect that itself when it starts running
2747
2748 jlong size =
2749 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2750 // Allocate the C++ Thread structure and create the native thread. The
2751 // stack size retrieved from java is 64-bit signed, but the constructor takes
2752 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2753 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2754 // - Avoid passing negative values which would result in really large stacks.
2755 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2756 size_t sz = size > 0 ? (size_t) size : 0;
2757 native_thread = new JavaThread(&thread_entry, sz);
2758
2759 // At this point it may be possible that no osthread was created for the
2760 // JavaThread due to lack of memory. Check for this situation and throw
2761 // an exception if necessary. Eventually we may want to change this so
2762 // that we only grab the lock if the thread was created successfully -
2763 // then we can also do this check and throw the exception in the
2764 // JavaThread constructor.
2765 if (native_thread->osthread() != NULL) {
2766 // Note: the current thread is not being used within "prepare".
2767 native_thread->prepare(jthread);
2768 }
2769 }
2770 }
2771
2772 if (throw_illegal_thread_state) {
2773 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2774 }
2775
2776 assert(native_thread != NULL, "Starting null thread?");
2777
2778 if (native_thread->osthread() == NULL) {
2779 // No one should hold a reference to the 'native_thread'.
2780 native_thread->smr_delete();
2781 if (JvmtiExport::should_post_resource_exhausted()) {
2782 JvmtiExport::post_resource_exhausted(
2783 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2784 os::native_thread_creation_failed_msg());
2785 }
2786 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2787 os::native_thread_creation_failed_msg());
2788 }
2789
2790 Thread::start(native_thread);
2791
2792 JVM_END
2793
2794
2795 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2796 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2797 // but is thought to be reliable and simple. In the case, where the receiver is the
2798 // same thread as the sender, no VM_Operation is needed.
2799 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2800 JVMWrapper("JVM_StopThread");
2801
2802 // A nested ThreadsListHandle will grab the Threads_lock so create
2803 // tlh before we resolve throwable.
2804 ThreadsListHandle tlh(thread);
2805 oop java_throwable = JNIHandles::resolve(throwable);
2806 if (java_throwable == NULL) {
2807 THROW(vmSymbols::java_lang_NullPointerException());
2808 }
2809 oop java_thread = NULL;
2810 JavaThread* receiver = NULL;
2811 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2812 Events::log_exception(thread,
2813 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2814 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2815
2816 if (is_alive) {
2817 // jthread refers to a live JavaThread.
2818 if (thread == receiver) {
2819 // Exception is getting thrown at self so no VM_Operation needed.
2820 THROW_OOP(java_throwable);
2821 } else {
2822 // Use a VM_Operation to throw the exception.
2823 Thread::send_async_exception(java_thread, java_throwable);
2824 }
2825 } else {
2826 // Either:
2827 // - target thread has not been started before being stopped, or
2828 // - target thread already terminated
2829 // We could read the threadStatus to determine which case it is
2830 // but that is overkill as it doesn't matter. We must set the
2831 // stillborn flag for the first case, and if the thread has already
2832 // exited setting this flag has no effect.
2833 java_lang_Thread::set_stillborn(java_thread);
2834 }
2835 JVM_END
2836
2837
2838 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2839 JVMWrapper("JVM_IsThreadAlive");
2840
2841 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2842 return java_lang_Thread::is_alive(thread_oop);
2843 JVM_END
2844
2845
2846 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2847 JVMWrapper("JVM_SuspendThread");
2848
2849 ThreadsListHandle tlh(thread);
2850 JavaThread* receiver = NULL;
2851 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2852 if (is_alive) {
2853 // jthread refers to a live JavaThread.
2854 {
2855 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2856 if (receiver->is_external_suspend()) {
2857 // Don't allow nested external suspend requests. We can't return
2858 // an error from this interface so just ignore the problem.
2859 return;
2860 }
2861 if (receiver->is_exiting()) { // thread is in the process of exiting
2862 return;
2863 }
2864 receiver->set_external_suspend();
2865 }
2866
2867 // java_suspend() will catch threads in the process of exiting
2868 // and will ignore them.
2869 receiver->java_suspend();
2870
2871 // It would be nice to have the following assertion in all the
2872 // time, but it is possible for a racing resume request to have
2873 // resumed this thread right after we suspended it. Temporarily
2874 // enable this assertion if you are chasing a different kind of
2875 // bug.
2876 //
2877 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2878 // receiver->is_being_ext_suspended(), "thread is not suspended");
2879 }
2880 JVM_END
2881
2882
2883 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2884 JVMWrapper("JVM_ResumeThread");
2885
2886 ThreadsListHandle tlh(thread);
2887 JavaThread* receiver = NULL;
2888 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2889 if (is_alive) {
2890 // jthread refers to a live JavaThread.
2891
2892 // This is the original comment for this Threads_lock grab:
2893 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2894 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2895 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2896 // looks at it.
2897 //
2898 // The above comment dates back to when we had both internal and
2899 // external suspend APIs that shared a common underlying mechanism.
2900 // External suspend is now entirely cooperative and doesn't share
2901 // anything with internal suspend. That said, there are some
2902 // assumptions in the VM that an external resume grabs the
2903 // Threads_lock. We can't drop the Threads_lock grab here until we
2904 // resolve the assumptions that exist elsewhere.
2905 //
2906 MutexLocker ml(Threads_lock);
2907 receiver->java_resume();
2908 }
2909 JVM_END
2910
2911
2912 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2913 JVMWrapper("JVM_SetThreadPriority");
2914
2915 ThreadsListHandle tlh(thread);
2916 oop java_thread = NULL;
2917 JavaThread* receiver = NULL;
2918 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2919 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2920
2921 if (is_alive) {
2922 // jthread refers to a live JavaThread.
2923 Thread::set_priority(receiver, (ThreadPriority)prio);
2924 }
2925 // Implied else: If the JavaThread hasn't started yet, then the
2926 // priority set in the java.lang.Thread object above will be pushed
2927 // down when it does start.
2928 JVM_END
2929
2930
2931 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2932 JVMWrapper("JVM_Yield");
2933 if (os::dont_yield()) return;
2934 HOTSPOT_THREAD_YIELD();
2935 os::naked_yield();
2936 JVM_END
2937
2938 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
2939 assert(event != NULL, "invariant");
2940 assert(event->should_commit(), "invariant");
2941 event->set_time(millis);
2942 event->commit();
2943 }
2944
2945 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2946 JVMWrapper("JVM_Sleep");
2947
2948 if (millis < 0) {
2949 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2950 }
2951
2952 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2953 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2954 }
2955
2956 // Save current thread state and restore it at the end of this block.
2957 // And set new thread state to SLEEPING.
2958 JavaThreadSleepState jtss(thread);
2959
2960 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2961 EventThreadSleep event;
2962
2963 if (millis == 0) {
2964 os::naked_yield();
2965 } else {
2966 ThreadState old_state = thread->osthread()->get_state();
2967 thread->osthread()->set_state(SLEEPING);
2968 if (os::sleep(thread, millis, true) == OS_INTRPT) {
2969 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
2970 // us while we were sleeping. We do not overwrite those.
2971 if (!HAS_PENDING_EXCEPTION) {
2972 if (event.should_commit()) {
2973 post_thread_sleep_event(&event, millis);
2974 }
2975 HOTSPOT_THREAD_SLEEP_END(1);
2976
2977 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2978 // to properly restore the thread state. That's likely wrong.
2979 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2980 }
2981 }
2982 thread->osthread()->set_state(old_state);
2983 }
2984 if (event.should_commit()) {
2985 post_thread_sleep_event(&event, millis);
2986 }
2987 HOTSPOT_THREAD_SLEEP_END(0);
2988 JVM_END
2989
2990 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
2991 JVMWrapper("JVM_CurrentThread");
2992 oop jthread = thread->threadObj();
2993 assert (thread != NULL, "no current thread!");
2994 return JNIHandles::make_local(env, jthread);
2995 JVM_END
2996
2997
2998 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
2999 JVMWrapper("JVM_CountStackFrames");
3000
3001 uint32_t debug_bits = 0;
3002 ThreadsListHandle tlh(thread);
3003 JavaThread* receiver = NULL;
3004 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3005 int count = 0;
3006 if (is_alive) {
3007 // jthread refers to a live JavaThread.
3008 if (receiver->is_thread_fully_suspended(true /* wait for suspend completion */, &debug_bits)) {
3009 // Count all java activation, i.e., number of vframes.
3010 for (vframeStream vfst(receiver); !vfst.at_end(); vfst.next()) {
3011 // Native frames are not counted.
3012 if (!vfst.method()->is_native()) count++;
3013 }
3014 } else {
3015 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3016 "this thread is not suspended");
3017 }
3018 }
3019 // Implied else: if JavaThread is not alive simply return a count of 0.
3020
3021 return count;
3022 JVM_END
3023
3024
3025 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3026 JVMWrapper("JVM_Interrupt");
3027
3028 ThreadsListHandle tlh(thread);
3029 JavaThread* receiver = NULL;
3030 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3031 if (is_alive) {
3032 // jthread refers to a live JavaThread.
3033 Thread::interrupt(receiver);
3034 }
3035 JVM_END
3036
3037
3038 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3039 JVMWrapper("JVM_IsInterrupted");
3040
3041 ThreadsListHandle tlh(thread);
3042 JavaThread* receiver = NULL;
3043 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3044 if (is_alive) {
3045 // jthread refers to a live JavaThread.
3046 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3047 } else {
3048 return JNI_FALSE;
3049 }
3050 JVM_END
3051
3052
3053 // Return true iff the current thread has locked the object passed in
3054
3055 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3056 JVMWrapper("JVM_HoldsLock");
3057 assert(THREAD->is_Java_thread(), "sanity check");
3058 if (obj == NULL) {
3059 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3060 }
3061 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3062 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3063 JVM_END
3064
3065
3066 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3067 JVMWrapper("JVM_DumpAllStacks");
3068 VM_PrintThreads op;
3069 VMThread::execute(&op);
3070 if (JvmtiExport::should_post_data_dump()) {
3071 JvmtiExport::post_data_dump();
3072 }
3073 JVM_END
3074
3075 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3076 JVMWrapper("JVM_SetNativeThreadName");
3077
3078 // We don't use a ThreadsListHandle here because the current thread
3079 // must be alive.
3080 oop java_thread = JNIHandles::resolve_non_null(jthread);
3081 JavaThread* thr = java_lang_Thread::thread(java_thread);
3082 if (thread == thr && !thr->has_attached_via_jni()) {
3083 // Thread naming is only supported for the current thread and
3084 // we don't set the name of an attached thread to avoid stepping
3085 // on other programs.
3086 ResourceMark rm(thread);
3087 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3088 os::set_native_thread_name(thread_name);
3089 }
3090 JVM_END
3091
3092 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3093
3094 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3095 JVMWrapper("JVM_GetClassContext");
3096 ResourceMark rm(THREAD);
3097 JvmtiVMObjectAllocEventCollector oam;
3098 vframeStream vfst(thread);
3099
3100 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3101 // This must only be called from SecurityManager.getClassContext
3102 Method* m = vfst.method();
3103 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3104 m->name() == vmSymbols::getClassContext_name() &&
3105 m->signature() == vmSymbols::void_class_array_signature())) {
3106 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3107 }
3108 }
3109
3110 // Collect method holders
3111 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3112 for (; !vfst.at_end(); vfst.security_next()) {
3113 Method* m = vfst.method();
3114 // Native frames are not returned
3115 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3116 Klass* holder = m->method_holder();
3117 assert(holder->is_klass(), "just checking");
3118 klass_array->append(holder);
3119 }
3120 }
3121
3122 // Create result array of type [Ljava/lang/Class;
3123 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3124 // Fill in mirrors corresponding to method holders
3125 for (int i = 0; i < klass_array->length(); i++) {
3126 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3127 }
3128
3129 return (jobjectArray) JNIHandles::make_local(env, result);
3130 JVM_END
3131
3132
3133 // java.lang.Package ////////////////////////////////////////////////////////////////
3134
3135
3136 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3137 JVMWrapper("JVM_GetSystemPackage");
3138 ResourceMark rm(THREAD);
3139 JvmtiVMObjectAllocEventCollector oam;
3140 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3141 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3142 return (jstring) JNIHandles::make_local(result);
3143 JVM_END
3144
3145
3146 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3147 JVMWrapper("JVM_GetSystemPackages");
3148 JvmtiVMObjectAllocEventCollector oam;
3149 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3150 return (jobjectArray) JNIHandles::make_local(result);
3151 JVM_END
3152
3153
3154 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3155
3156
3157 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3158 JVMWrapper("JVM_GetAndClearReferencePendingList");
3159
3160 MonitorLockerEx ml(Heap_lock);
3161 oop ref = Universe::reference_pending_list();
3162 if (ref != NULL) {
3163 Universe::set_reference_pending_list(NULL);
3164 }
3165 return JNIHandles::make_local(env, ref);
3166 JVM_END
3167
3168 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3169 JVMWrapper("JVM_HasReferencePendingList");
3170 MonitorLockerEx ml(Heap_lock);
3171 return Universe::has_reference_pending_list();
3172 JVM_END
3173
3174 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3175 JVMWrapper("JVM_WaitForReferencePendingList");
3176 MonitorLockerEx ml(Heap_lock);
3177 while (!Universe::has_reference_pending_list()) {
3178 ml.wait();
3179 }
3180 JVM_END
3181
3182
3183 // ObjectInputStream ///////////////////////////////////////////////////////////////
3184
3185 // Return the first user-defined class loader up the execution stack, or null
3186 // if only code from the bootstrap or platform class loader is on the stack.
3187
3188 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3189 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3190 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3191 oop loader = vfst.method()->method_holder()->class_loader();
3192 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3193 return JNIHandles::make_local(env, loader);
3194 }
3195 }
3196 return NULL;
3197 JVM_END
3198
3199
3200 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3201
3202
3203 // resolve array handle and check arguments
3204 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3205 if (arr == NULL) {
3206 THROW_0(vmSymbols::java_lang_NullPointerException());
3207 }
3208 oop a = JNIHandles::resolve_non_null(arr);
3209 if (!a->is_array()) {
3210 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3211 } else if (type_array_only && !a->is_typeArray()) {
3212 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3213 }
3214 return arrayOop(a);
3215 }
3216
3217
3218 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3219 JVMWrapper("JVM_GetArrayLength");
3220 arrayOop a = check_array(env, arr, false, CHECK_0);
3221 return a->length();
3222 JVM_END
3223
3224
3225 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3226 JVMWrapper("JVM_Array_Get");
3227 JvmtiVMObjectAllocEventCollector oam;
3228 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3229 jvalue value;
3230 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3231 oop box = Reflection::box(&value, type, CHECK_NULL);
3232 return JNIHandles::make_local(env, box);
3233 JVM_END
3234
3235
3236 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3237 JVMWrapper("JVM_GetPrimitiveArrayElement");
3238 jvalue value;
3239 value.i = 0; // to initialize value before getting used in CHECK
3240 arrayOop a = check_array(env, arr, true, CHECK_(value));
3241 assert(a->is_typeArray(), "just checking");
3242 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3243 BasicType wide_type = (BasicType) wCode;
3244 if (type != wide_type) {
3245 Reflection::widen(&value, type, wide_type, CHECK_(value));
3246 }
3247 return value;
3248 JVM_END
3249
3250
3251 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3252 JVMWrapper("JVM_SetArrayElement");
3253 arrayOop a = check_array(env, arr, false, CHECK);
3254 oop box = JNIHandles::resolve(val);
3255 jvalue value;
3256 value.i = 0; // to initialize value before getting used in CHECK
3257 BasicType value_type;
3258 if (a->is_objArray()) {
3259 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3260 value_type = Reflection::unbox_for_regular_object(box, &value);
3261 } else {
3262 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3263 }
3264 Reflection::array_set(&value, a, index, value_type, CHECK);
3265 JVM_END
3266
3267
3268 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3269 JVMWrapper("JVM_SetPrimitiveArrayElement");
3270 arrayOop a = check_array(env, arr, true, CHECK);
3271 assert(a->is_typeArray(), "just checking");
3272 BasicType value_type = (BasicType) vCode;
3273 Reflection::array_set(&v, a, index, value_type, CHECK);
3274 JVM_END
3275
3276
3277 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3278 JVMWrapper("JVM_NewArray");
3279 JvmtiVMObjectAllocEventCollector oam;
3280 oop element_mirror = JNIHandles::resolve(eltClass);
3281 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3282 return JNIHandles::make_local(env, result);
3283 JVM_END
3284
3285
3286 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3287 JVMWrapper("JVM_NewMultiArray");
3288 JvmtiVMObjectAllocEventCollector oam;
3289 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3290 oop element_mirror = JNIHandles::resolve(eltClass);
3291 assert(dim_array->is_typeArray(), "just checking");
3292 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3293 return JNIHandles::make_local(env, result);
3294 JVM_END
3295
3296
3297 // Library support ///////////////////////////////////////////////////////////////////////////
3298
3299 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3300 //%note jvm_ct
3301 JVMWrapper("JVM_LoadLibrary");
3302 char ebuf[1024];
3303 void *load_result;
3304 {
3305 ThreadToNativeFromVM ttnfvm(thread);
3306 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3307 }
3308 if (load_result == NULL) {
3309 char msg[1024];
3310 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3311 // Since 'ebuf' may contain a string encoded using
3312 // platform encoding scheme, we need to pass
3313 // Exceptions::unsafe_to_utf8 to the new_exception method
3314 // as the last argument. See bug 6367357.
3315 Handle h_exception =
3316 Exceptions::new_exception(thread,
3317 vmSymbols::java_lang_UnsatisfiedLinkError(),
3318 msg, Exceptions::unsafe_to_utf8);
3319
3320 THROW_HANDLE_0(h_exception);
3321 }
3322 return load_result;
3323 JVM_END
3324
3325
3326 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3327 JVMWrapper("JVM_UnloadLibrary");
3328 os::dll_unload(handle);
3329 JVM_END
3330
3331
3332 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3333 JVMWrapper("JVM_FindLibraryEntry");
3334 return os::dll_lookup(handle, name);
3335 JVM_END
3336
3337
3338 // JNI version ///////////////////////////////////////////////////////////////////////////////
3339
3340 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3341 JVMWrapper("JVM_IsSupportedJNIVersion");
3342 return Threads::is_supported_jni_version_including_1_1(version);
3343 JVM_END
3344
3345
3346 // String support ///////////////////////////////////////////////////////////////////////////
3347
3348 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3349 JVMWrapper("JVM_InternString");
3350 JvmtiVMObjectAllocEventCollector oam;
3351 if (str == NULL) return NULL;
3352 oop string = JNIHandles::resolve_non_null(str);
3353 oop result = StringTable::intern(string, CHECK_NULL);
3354 return (jstring) JNIHandles::make_local(env, result);
3355 JVM_END
3356
3357
3358 // Raw monitor support //////////////////////////////////////////////////////////////////////
3359
3360 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3361 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3362 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3363 // that only works with java threads.
3364
3365
3366 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3367 VM_Exit::block_if_vm_exited();
3368 JVMWrapper("JVM_RawMonitorCreate");
3369 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3370 }
3371
3372
3373 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3374 VM_Exit::block_if_vm_exited();
3375 JVMWrapper("JVM_RawMonitorDestroy");
3376 delete ((Mutex*) mon);
3377 }
3378
3379
3380 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3381 VM_Exit::block_if_vm_exited();
3382 JVMWrapper("JVM_RawMonitorEnter");
3383 ((Mutex*) mon)->jvm_raw_lock();
3384 return 0;
3385 }
3386
3387
3388 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3389 VM_Exit::block_if_vm_exited();
3390 JVMWrapper("JVM_RawMonitorExit");
3391 ((Mutex*) mon)->jvm_raw_unlock();
3392 }
3393
3394
3395 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3396
3397 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3398 Handle loader, Handle protection_domain,
3399 jboolean throwError, TRAPS) {
3400 // Security Note:
3401 // The Java level wrapper will perform the necessary security check allowing
3402 // us to pass the NULL as the initiating class loader. The VM is responsible for
3403 // the checkPackageAccess relative to the initiating class loader via the
3404 // protection_domain. The protection_domain is passed as NULL by the java code
3405 // if there is no security manager in 3-arg Class.forName().
3406 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3407
3408 // Check if we should initialize the class
3409 if (init && klass->is_instance_klass()) {
3410 klass->initialize(CHECK_NULL);
3411 }
3412 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3413 }
3414
3415
3416 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3417
3418 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3419 JVMWrapper("JVM_InvokeMethod");
3420 Handle method_handle;
3421 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3422 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3423 Handle receiver(THREAD, JNIHandles::resolve(obj));
3424 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3425 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3426 jobject res = JNIHandles::make_local(env, result);
3427 if (JvmtiExport::should_post_vm_object_alloc()) {
3428 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3429 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3430 if (java_lang_Class::is_primitive(ret_type)) {
3431 // Only for primitive type vm allocates memory for java object.
3432 // See box() method.
3433 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3434 }
3435 }
3436 return res;
3437 } else {
3438 THROW_0(vmSymbols::java_lang_StackOverflowError());
3439 }
3440 JVM_END
3441
3442
3443 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3444 JVMWrapper("JVM_NewInstanceFromConstructor");
3445 oop constructor_mirror = JNIHandles::resolve(c);
3446 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3447 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3448 jobject res = JNIHandles::make_local(env, result);
3449 if (JvmtiExport::should_post_vm_object_alloc()) {
3450 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3451 }
3452 return res;
3453 JVM_END
3454
3455 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3456
3457 JVM_LEAF(jboolean, JVM_SupportsCX8())
3458 JVMWrapper("JVM_SupportsCX8");
3459 return VM_Version::supports_cx8();
3460 JVM_END
3461
3462 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3463 JVMWrapper("JVM_InitializeFromArchive");
3464 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3465 assert(k->is_klass(), "just checking");
3466 HeapShared::initialize_from_archived_subgraph(k);
3467 JVM_END
3468
3469 // Returns an array of all live Thread objects (VM internal JavaThreads,
3470 // jvmti agent threads, and JNI attaching threads are skipped)
3471 // See CR 6404306 regarding JNI attaching threads
3472 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3473 ResourceMark rm(THREAD);
3474 ThreadsListEnumerator tle(THREAD, false, false);
3475 JvmtiVMObjectAllocEventCollector oam;
3476
3477 int num_threads = tle.num_threads();
3478 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3479 objArrayHandle threads_ah(THREAD, r);
3480
3481 for (int i = 0; i < num_threads; i++) {
3482 Handle h = tle.get_threadObj(i);
3483 threads_ah->obj_at_put(i, h());
3484 }
3485
3486 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3487 JVM_END
3488
3489
3490 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3491 // Return StackTraceElement[][], each element is the stack trace of a thread in
3492 // the corresponding entry in the given threads array
3493 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3494 JVMWrapper("JVM_DumpThreads");
3495 JvmtiVMObjectAllocEventCollector oam;
3496
3497 // Check if threads is null
3498 if (threads == NULL) {
3499 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3500 }
3501
3502 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3503 objArrayHandle ah(THREAD, a);
3504 int num_threads = ah->length();
3505 // check if threads is non-empty array
3506 if (num_threads == 0) {
3507 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3508 }
3509
3510 // check if threads is not an array of objects of Thread class
3511 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3512 if (k != SystemDictionary::Thread_klass()) {
3513 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3514 }
3515
3516 ResourceMark rm(THREAD);
3517
3518 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3519 for (int i = 0; i < num_threads; i++) {
3520 oop thread_obj = ah->obj_at(i);
3521 instanceHandle h(THREAD, (instanceOop) thread_obj);
3522 thread_handle_array->append(h);
3523 }
3524
3525 // The JavaThread references in thread_handle_array are validated
3526 // in VM_ThreadDump::doit().
3527 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3528 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3529
3530 JVM_END
3531
3532 // JVM monitoring and management support
3533 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3534 return Management::get_jmm_interface(version);
3535 JVM_END
3536
3537 // com.sun.tools.attach.VirtualMachine agent properties support
3538 //
3539 // Initialize the agent properties with the properties maintained in the VM
3540 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3541 JVMWrapper("JVM_InitAgentProperties");
3542 ResourceMark rm;
3543
3544 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3545
3546 PUTPROP(props, "sun.java.command", Arguments::java_command());
3547 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3548 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3549 return properties;
3550 JVM_END
3551
3552 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3553 {
3554 JVMWrapper("JVM_GetEnclosingMethodInfo");
3555 JvmtiVMObjectAllocEventCollector oam;
3556
3557 if (ofClass == NULL) {
3558 return NULL;
3559 }
3560 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3561 // Special handling for primitive objects
3562 if (java_lang_Class::is_primitive(mirror())) {
3563 return NULL;
3564 }
3565 Klass* k = java_lang_Class::as_Klass(mirror());
3566 if (!k->is_instance_klass()) {
3567 return NULL;
3568 }
3569 InstanceKlass* ik = InstanceKlass::cast(k);
3570 int encl_method_class_idx = ik->enclosing_method_class_index();
3571 if (encl_method_class_idx == 0) {
3572 return NULL;
3573 }
3574 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3575 objArrayHandle dest(THREAD, dest_o);
3576 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3577 dest->obj_at_put(0, enc_k->java_mirror());
3578 int encl_method_method_idx = ik->enclosing_method_method_index();
3579 if (encl_method_method_idx != 0) {
3580 Symbol* sym = ik->constants()->symbol_at(
3581 extract_low_short_from_int(
3582 ik->constants()->name_and_type_at(encl_method_method_idx)));
3583 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3584 dest->obj_at_put(1, str());
3585 sym = ik->constants()->symbol_at(
3586 extract_high_short_from_int(
3587 ik->constants()->name_and_type_at(encl_method_method_idx)));
3588 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3589 dest->obj_at_put(2, str());
3590 }
3591 return (jobjectArray) JNIHandles::make_local(dest());
3592 }
3593 JVM_END
3594
3595 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3596 {
3597 memset(info, 0, info_size);
3598
3599 info->jvm_version = VM_Version::jvm_version();
3600 info->patch_version = VM_Version::vm_patch_version();
3601
3602 // when we add a new capability in the jvm_version_info struct, we should also
3603 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3604 // counter defined in runtimeService.cpp.
3605 info->is_attach_supported = AttachListener::is_attach_supported();
3606 }
3607 JVM_END
3608
3609 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3610 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3611 ResourceMark rm(THREAD);
3612
3613 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3614 return NULL;
3615 }
3616
3617 char** vm_flags = Arguments::jvm_flags_array();
3618 char** vm_args = Arguments::jvm_args_array();
3619 int num_flags = Arguments::num_jvm_flags();
3620 int num_args = Arguments::num_jvm_args();
3621
3622 InstanceKlass* ik = SystemDictionary::String_klass();
3623 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3624 objArrayHandle result_h(THREAD, r);
3625
3626 int index = 0;
3627 for (int j = 0; j < num_flags; j++, index++) {
3628 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3629 result_h->obj_at_put(index, h());
3630 }
3631 for (int i = 0; i < num_args; i++, index++) {
3632 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3633 result_h->obj_at_put(index, h());
3634 }
3635 return (jobjectArray) JNIHandles::make_local(env, result_h());
3636 JVM_END
3637
3638 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3639 return os::get_signal_number(name);
3640 JVM_END