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