1 /*
2 * Copyright (c) 1997, 2016, 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 "classfile/classFileStream.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/javaAssertions.hpp"
29 #include "classfile/javaClasses.inline.hpp"
30 #include "classfile/stringTable.hpp"
31 #include "classfile/systemDictionary.hpp"
32 #include "classfile/vmSymbols.hpp"
33 #include "gc/shared/barrierSet.inline.hpp"
34 #include "gc/shared/collectedHeap.inline.hpp"
35 #include "interpreter/bytecode.hpp"
36 #include "memory/oopFactory.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/fieldStreams.hpp"
39 #include "oops/instanceKlass.hpp"
40 #include "oops/method.hpp"
41 #include "oops/objArrayKlass.hpp"
42 #include "oops/objArrayOop.inline.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "prims/jvm.h"
45 #include "prims/jvm_misc.hpp"
46 #include "prims/jvmtiExport.hpp"
47 #include "prims/jvmtiThreadState.hpp"
48 #include "prims/nativeLookup.hpp"
49 #include "prims/privilegedStack.hpp"
50 #include "prims/stackwalk.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/atomic.inline.hpp"
53 #include "runtime/handles.inline.hpp"
54 #include "runtime/init.hpp"
55 #include "runtime/interfaceSupport.hpp"
56 #include "runtime/java.hpp"
57 #include "runtime/javaCalls.hpp"
58 #include "runtime/jfieldIDWorkaround.hpp"
59 #include "runtime/orderAccess.inline.hpp"
60 #include "runtime/os.inline.hpp"
61 #include "runtime/perfData.hpp"
62 #include "runtime/reflection.hpp"
63 #include "runtime/thread.inline.hpp"
64 #include "runtime/vframe.hpp"
65 #include "runtime/vm_operations.hpp"
66 #include "runtime/vm_version.hpp"
67 #include "services/attachListener.hpp"
68 #include "services/management.hpp"
69 #include "services/threadService.hpp"
70 #include "trace/tracing.hpp"
71 #include "utilities/copy.hpp"
72 #include "utilities/defaultStream.hpp"
73 #include "utilities/dtrace.hpp"
74 #include "utilities/events.hpp"
75 #include "utilities/histogram.hpp"
76 #include "utilities/macros.hpp"
77 #include "utilities/top.hpp"
78 #include "utilities/utf8.hpp"
79 #if INCLUDE_CDS
80 #include "classfile/sharedClassUtil.hpp"
81 #include "classfile/systemDictionaryShared.hpp"
82 #endif
83 #ifdef TARGET_OS_FAMILY_linux
84 # include "jvm_linux.h"
85 #endif
86 #ifdef TARGET_OS_FAMILY_solaris
87 # include "jvm_solaris.h"
88 #endif
89 #ifdef TARGET_OS_FAMILY_windows
90 # include "jvm_windows.h"
91 #endif
92 #ifdef TARGET_OS_FAMILY_aix
93 # include "jvm_aix.h"
94 #endif
95 #ifdef TARGET_OS_FAMILY_bsd
96 # include "jvm_bsd.h"
97 #endif
98
99 #include <errno.h>
100
101 /*
102 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
103 such ctors and calls MUST NOT come between an oop declaration/init and its
104 usage because if objects are move this may cause various memory stomps, bus
105 errors and segfaults. Here is a cookbook for causing so called "naked oop
106 failures":
107
108 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
109 JVMWrapper("JVM_GetClassDeclaredFields");
110
111 // Object address to be held directly in mirror & not visible to GC
112 oop mirror = JNIHandles::resolve_non_null(ofClass);
113
114 // If this ctor can hit a safepoint, moving objects around, then
115 ComplexConstructor foo;
116
117 // Boom! mirror may point to JUNK instead of the intended object
118 (some dereference of mirror)
119
120 // Here's another call that may block for GC, making mirror stale
121 MutexLocker ml(some_lock);
122
123 // And here's an initializer that can result in a stale oop
124 // all in one step.
125 oop o = call_that_can_throw_exception(TRAPS);
126
127
128 The solution is to keep the oop declaration BELOW the ctor or function
129 call that might cause a GC, do another resolve to reassign the oop, or
130 consider use of a Handle instead of an oop so there is immunity from object
131 motion. But note that the "QUICK" entries below do not have a handlemark
132 and thus can only support use of handles passed in.
133 */
134
135 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
136 ResourceMark rm;
137 int line_number = -1;
138 const char * source_file = NULL;
139 const char * trace = "explicit";
140 InstanceKlass* caller = NULL;
141 JavaThread* jthread = JavaThread::current();
142 if (jthread->has_last_Java_frame()) {
143 vframeStream vfst(jthread);
144
145 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
146 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
147 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
148 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
149 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
150
151 Method* last_caller = NULL;
152
153 while (!vfst.at_end()) {
154 Method* m = vfst.method();
155 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
156 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
157 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
158 break;
159 }
160 last_caller = m;
161 vfst.next();
162 }
163 // if this is called from Class.forName0 and that is called from Class.forName,
164 // then print the caller of Class.forName. If this is Class.loadClass, then print
165 // that caller, otherwise keep quiet since this should be picked up elsewhere.
166 bool found_it = false;
167 if (!vfst.at_end() &&
168 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
169 vfst.method()->name() == vmSymbols::forName0_name()) {
170 vfst.next();
171 if (!vfst.at_end() &&
172 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
173 vfst.method()->name() == vmSymbols::forName_name()) {
174 vfst.next();
175 found_it = true;
176 }
177 } else if (last_caller != NULL &&
178 last_caller->method_holder()->name() ==
179 vmSymbols::java_lang_ClassLoader() &&
180 (last_caller->name() == vmSymbols::loadClassInternal_name() ||
181 last_caller->name() == vmSymbols::loadClass_name())) {
182 found_it = true;
183 } else if (!vfst.at_end()) {
184 if (vfst.method()->is_native()) {
185 // JNI call
186 found_it = true;
187 }
188 }
189 if (found_it && !vfst.at_end()) {
190 // found the caller
191 caller = vfst.method()->method_holder();
192 line_number = vfst.method()->line_number_from_bci(vfst.bci());
193 if (line_number == -1) {
194 // show method name if it's a native method
195 trace = vfst.method()->name_and_sig_as_C_string();
196 }
197 Symbol* s = caller->source_file_name();
198 if (s != NULL) {
199 source_file = s->as_C_string();
200 }
201 }
202 }
203 if (caller != NULL) {
204 if (to_class != caller) {
205 const char * from = caller->external_name();
206 const char * to = to_class->external_name();
207 // print in a single call to reduce interleaving between threads
208 if (source_file != NULL) {
209 log_debug(classresolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
210 } else {
211 log_debug(classresolve)("%s %s (%s)", from, to, trace);
212 }
213 }
214 }
215 }
216
217 void trace_class_resolution(Klass* to_class) {
218 EXCEPTION_MARK;
219 trace_class_resolution_impl(to_class, THREAD);
220 if (HAS_PENDING_EXCEPTION) {
221 CLEAR_PENDING_EXCEPTION;
222 }
223 }
224
225 // Wrapper to trace JVM functions
226
227 #ifdef ASSERT
228 Histogram* JVMHistogram;
229 volatile jint JVMHistogram_lock = 0;
230
231 class JVMHistogramElement : public HistogramElement {
232 public:
233 JVMHistogramElement(const char* name);
234 };
235
236 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
237 _name = elementName;
238 uintx count = 0;
239
240 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
241 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
242 count +=1;
243 if ( (WarnOnStalledSpinLock > 0)
244 && (count % WarnOnStalledSpinLock == 0)) {
245 warning("JVMHistogram_lock seems to be stalled");
246 }
247 }
248 }
249
250 if(JVMHistogram == NULL)
251 JVMHistogram = new Histogram("JVM Call Counts",100);
252
253 JVMHistogram->add_element(this);
254 Atomic::dec(&JVMHistogram_lock);
255 }
256
257 #define JVMCountWrapper(arg) \
258 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
259 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
260
261 #define JVMWrapper(arg) JVMCountWrapper(arg);
262 #else
263 #define JVMWrapper(arg)
264 #endif
265
266
267 // Interface version /////////////////////////////////////////////////////////////////////
268
269
270 JVM_LEAF(jint, JVM_GetInterfaceVersion())
271 return JVM_INTERFACE_VERSION;
272 JVM_END
273
274
275 // java.lang.System //////////////////////////////////////////////////////////////////////
276
277
278 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
279 JVMWrapper("JVM_CurrentTimeMillis");
280 return os::javaTimeMillis();
281 JVM_END
282
283 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
284 JVMWrapper("JVM_NanoTime");
285 return os::javaTimeNanos();
286 JVM_END
287
288 // The function below is actually exposed by jdk.internal.misc.VM and not
289 // java.lang.System, but we choose to keep it here so that it stays next
290 // to JVM_CurrentTimeMillis and JVM_NanoTime
291
292 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
293 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
294
295 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
296 JVMWrapper("JVM_GetNanoTimeAdjustment");
297 jlong seconds;
298 jlong nanos;
299
300 os::javaTimeSystemUTC(seconds, nanos);
301
302 // We're going to verify that the result can fit in a long.
303 // For that we need the difference in seconds between 'seconds'
304 // and 'offset_secs' to be such that:
305 // |seconds - offset_secs| < (2^63/10^9)
306 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
307 // which makes |seconds - offset_secs| < 2^33
308 // and we will prefer +/- 2^32 as the maximum acceptable diff
309 // as 2^32 has a more natural feel than 2^33...
310 //
311 // So if |seconds - offset_secs| >= 2^32 - we return a special
312 // sentinel value (-1) which the caller should take as an
313 // exception value indicating that the offset given to us is
314 // too far from range of the current time - leading to too big
315 // a nano adjustment. The caller is expected to recover by
316 // computing a more accurate offset and calling this method
317 // again. (For the record 2^32 secs is ~136 years, so that
318 // should rarely happen)
319 //
320 jlong diff = seconds - offset_secs;
321 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
322 return -1; // sentinel value: the offset is too far off the target
323 }
324
325 // return the adjustment. If you compute a time by adding
326 // this number of nanoseconds along with the number of seconds
327 // in the offset you should get the current UTC time.
328 return (diff * (jlong)1000000000) + nanos;
329 JVM_END
330
331 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
332 jobject dst, jint dst_pos, jint length))
333 JVMWrapper("JVM_ArrayCopy");
334 // Check if we have null pointers
335 if (src == NULL || dst == NULL) {
336 THROW(vmSymbols::java_lang_NullPointerException());
337 }
338 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
339 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
340 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop");
341 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop");
342 // Do copy
343 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
344 JVM_END
345
346
347 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
348 JavaValue r(T_OBJECT);
349 // public synchronized Object put(Object key, Object value);
350 HandleMark hm(THREAD);
351 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
352 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
353 JavaCalls::call_virtual(&r,
354 props,
355 KlassHandle(THREAD, SystemDictionary::Properties_klass()),
356 vmSymbols::put_name(),
357 vmSymbols::object_object_object_signature(),
358 key_str,
359 value_str,
360 THREAD);
361 }
362
363
364 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
365
366
367 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
368 JVMWrapper("JVM_InitProperties");
369 ResourceMark rm;
370
371 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
372
373 // System property list includes both user set via -D option and
374 // jvm system specific properties.
375 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
376 PUTPROP(props, p->key(), p->value());
377 }
378
379 // Convert the -XX:MaxDirectMemorySize= command line flag
380 // to the sun.nio.MaxDirectMemorySize property.
381 // Do this after setting user properties to prevent people
382 // from setting the value with a -D option, as requested.
383 {
384 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
385 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
386 } else {
387 char as_chars[256];
388 jio_snprintf(as_chars, sizeof(as_chars), SIZE_FORMAT, MaxDirectMemorySize);
389 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
390 }
391 }
392
393 // JVM monitoring and management support
394 // Add the sun.management.compiler property for the compiler's name
395 {
396 #undef CSIZE
397 #if defined(_LP64) || defined(_WIN64)
398 #define CSIZE "64-Bit "
399 #else
400 #define CSIZE
401 #endif // 64bit
402
403 #ifdef TIERED
404 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
405 #else
406 #if defined(COMPILER1)
407 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
408 #elif defined(COMPILER2)
409 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
410 #elif INCLUDE_JVMCI
411 #error "INCLUDE_JVMCI should imply TIERED"
412 #else
413 const char* compiler_name = "";
414 #endif // compilers
415 #endif // TIERED
416
417 if (*compiler_name != '\0' &&
418 (Arguments::mode() != Arguments::_int)) {
419 PUTPROP(props, "sun.management.compiler", compiler_name);
420 }
421 }
422
423 return properties;
424 JVM_END
425
426
427 /*
428 * Return the temporary directory that the VM uses for the attach
429 * and perf data files.
430 *
431 * It is important that this directory is well-known and the
432 * same for all VM instances. It cannot be affected by configuration
433 * variables such as java.io.tmpdir.
434 */
435 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
436 JVMWrapper("JVM_GetTemporaryDirectory");
437 HandleMark hm(THREAD);
438 const char* temp_dir = os::get_temp_directory();
439 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
440 return (jstring) JNIHandles::make_local(env, h());
441 JVM_END
442
443
444 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
445
446 extern volatile jint vm_created;
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 JVM_ENTRY(void, JVM_GetStackTraceElements(JNIEnv *env, jobject throwable, jobjectArray stackTrace))
518 JVMWrapper("JVM_GetStackTraceElements");
519 Handle exception(THREAD, JNIHandles::resolve(throwable));
520 objArrayOop st = objArrayOop(JNIHandles::resolve(stackTrace));
521 objArrayHandle stack_trace(THREAD, st);
522 // Fill in the allocated stack trace
523 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
524 JVM_END
525
526
527 // java.lang.StackWalker //////////////////////////////////////////////////////
528
529
530 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
531 jint skip_frames, jint frame_count, jint start_index,
532 jobjectArray classes,
533 jobjectArray frames))
534 JVMWrapper("JVM_CallStackWalk");
535 JavaThread* jt = (JavaThread*) THREAD;
536 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
537 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
538 }
539
540 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
541 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(classes));
542 objArrayHandle classes_array_h(THREAD, ca);
543
544 // frames array is null when only getting caller reference
545 objArrayOop fa = objArrayOop(JNIHandles::resolve(frames));
546 objArrayHandle frames_array_h(THREAD, fa);
547
548 int limit = start_index + frame_count;
549 if (classes_array_h->length() < limit) {
550 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
551 }
552
553 Handle result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
554 start_index, classes_array_h,
555 frames_array_h, CHECK_NULL);
556 return JNIHandles::make_local(env, result());
557 JVM_END
558
559
560 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
561 jint frame_count, jint start_index,
562 jobjectArray classes,
563 jobjectArray frames))
564 JVMWrapper("JVM_MoreStackWalk");
565 JavaThread* jt = (JavaThread*) THREAD;
566 objArrayOop ca = objArrayOop(JNIHandles::resolve_non_null(classes));
567 objArrayHandle classes_array_h(THREAD, ca);
568
569 // frames array is null when only getting caller reference
570 objArrayOop fa = objArrayOop(JNIHandles::resolve(frames));
571 objArrayHandle frames_array_h(THREAD, fa);
572
573 int limit = start_index+frame_count;
574 if (classes_array_h->length() < limit) {
575 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
576 }
577
578 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
579 return StackWalk::moreFrames(stackStream_h, mode, anchor, frame_count,
580 start_index, classes_array_h,
581 frames_array_h, THREAD);
582 JVM_END
583
584 JVM_ENTRY(void, JVM_FillStackFrames(JNIEnv *env, jclass stackStream,
585 jint start_index,
586 jobjectArray frames,
587 jint from_index, jint to_index))
588 JVMWrapper("JVM_FillStackFrames");
589 if (TraceStackWalk) {
590 tty->print("JVM_FillStackFrames() start_index=%d from_index=%d to_index=%d\n",
591 start_index, from_index, to_index);
592 }
593
594 JavaThread* jt = (JavaThread*) THREAD;
595
596 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
597 objArrayHandle frames_array_h(THREAD, fa);
598
599 if (frames_array_h->length() < to_index) {
600 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "array length not matched");
601 }
602
603 for (int i = from_index; i < to_index; i++) {
604 Handle stackFrame(THREAD, frames_array_h->obj_at(i));
605 java_lang_StackFrameInfo::fill_methodInfo(stackFrame, CHECK);
606 }
607 JVM_END
608
609 JVM_ENTRY(void, JVM_SetMethodInfo(JNIEnv *env, jobject frame))
610 JVMWrapper("JVM_SetMethodInfo");
611 Handle stackFrame(THREAD, JNIHandles::resolve(frame));
612 java_lang_StackFrameInfo::fill_methodInfo(stackFrame, THREAD);
613 JVM_END
614
615 // java.lang.Object ///////////////////////////////////////////////
616
617
618 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
619 JVMWrapper("JVM_IHashCode");
620 // as implemented in the classic virtual machine; return 0 if object is NULL
621 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
622 JVM_END
623
624
625 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
626 JVMWrapper("JVM_MonitorWait");
627 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
628 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
629 if (JvmtiExport::should_post_monitor_wait()) {
630 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
631
632 // The current thread already owns the monitor and it has not yet
633 // been added to the wait queue so the current thread cannot be
634 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
635 // event handler cannot accidentally consume an unpark() meant for
636 // the ParkEvent associated with this ObjectMonitor.
637 }
638 ObjectSynchronizer::wait(obj, ms, CHECK);
639 JVM_END
640
641
642 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
643 JVMWrapper("JVM_MonitorNotify");
644 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
645 ObjectSynchronizer::notify(obj, CHECK);
646 JVM_END
647
648
649 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
650 JVMWrapper("JVM_MonitorNotifyAll");
651 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
652 ObjectSynchronizer::notifyall(obj, CHECK);
653 JVM_END
654
655
656 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
657 JVMWrapper("JVM_Clone");
658 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
659 const KlassHandle klass (THREAD, obj->klass());
660 JvmtiVMObjectAllocEventCollector oam;
661
662 #ifdef ASSERT
663 // Just checking that the cloneable flag is set correct
664 if (obj->is_array()) {
665 guarantee(klass->is_cloneable(), "all arrays are cloneable");
666 } else {
667 guarantee(obj->is_instance(), "should be instanceOop");
668 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
669 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
670 }
671 #endif
672
673 // Check if class of obj supports the Cloneable interface.
674 // All arrays are considered to be cloneable (See JLS 20.1.5)
675 if (!klass->is_cloneable()) {
676 ResourceMark rm(THREAD);
677 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
678 }
679
680 // Make shallow object copy
681 const int size = obj->size();
682 oop new_obj_oop = NULL;
683 if (obj->is_array()) {
684 const int length = ((arrayOop)obj())->length();
685 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
686 } else {
687 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
688 }
689
690 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
691 // is modifying a reference field in the clonee, a non-oop-atomic copy might
692 // be suspended in the middle of copying the pointer and end up with parts
693 // of two different pointers in the field. Subsequent dereferences will crash.
694 // 4846409: an oop-copy of objects with long or double fields or arrays of same
695 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
696 // of oops. We know objects are aligned on a minimum of an jlong boundary.
697 // The same is true of StubRoutines::object_copy and the various oop_copy
698 // variants, and of the code generated by the inline_native_clone intrinsic.
699 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
700 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop,
701 (size_t)align_object_size(size) / HeapWordsPerLong);
702 // Clear the header
703 new_obj_oop->init_mark();
704
705 // Store check (mark entire object and let gc sort it out)
706 BarrierSet* bs = Universe::heap()->barrier_set();
707 assert(bs->has_write_region_opt(), "Barrier set does not have write_region");
708 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size));
709
710 Handle new_obj(THREAD, new_obj_oop);
711 // Special handling for MemberNames. Since they contain Method* metadata, they
712 // must be registered so that RedefineClasses can fix metadata contained in them.
713 if (java_lang_invoke_MemberName::is_instance(new_obj()) &&
714 java_lang_invoke_MemberName::is_method(new_obj())) {
715 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj());
716 // MemberName may be unresolved, so doesn't need registration until resolved.
717 if (method != NULL) {
718 methodHandle m(THREAD, method);
719 // This can safepoint and redefine method, so need both new_obj and method
720 // in a handle, for two different reasons. new_obj can move, method can be
721 // deleted if nothing is using it on the stack.
722 m->method_holder()->add_member_name(new_obj());
723 }
724 }
725
726 // Caution: this involves a java upcall, so the clone should be
727 // "gc-robust" by this stage.
728 if (klass->has_finalizer()) {
729 assert(obj->is_instance(), "should be instanceOop");
730 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
731 new_obj = Handle(THREAD, new_obj_oop);
732 }
733
734 return JNIHandles::make_local(env, new_obj());
735 JVM_END
736
737 // java.io.File ///////////////////////////////////////////////////////////////
738
739 JVM_LEAF(char*, JVM_NativePath(char* path))
740 JVMWrapper("JVM_NativePath");
741 return os::native_path(path);
742 JVM_END
743
744
745 // Misc. class handling ///////////////////////////////////////////////////////////
746
747
748 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
749 JVMWrapper("JVM_GetCallerClass");
750
751 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
752 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
753 // temporarily for existing code to use until a replacement API is defined.
754 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
755 Klass* k = thread->security_get_caller_class(depth);
756 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
757 }
758
759 // Getting the class of the caller frame.
760 //
761 // The call stack at this point looks something like this:
762 //
763 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
764 // [1] [ @CallerSensitive API.method ]
765 // [.] [ (skipped intermediate frames) ]
766 // [n] [ caller ]
767 vframeStream vfst(thread);
768 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
769 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
770 Method* m = vfst.method();
771 assert(m != NULL, "sanity");
772 switch (n) {
773 case 0:
774 // This must only be called from Reflection.getCallerClass
775 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
776 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
777 }
778 // fall-through
779 case 1:
780 // Frame 0 and 1 must be caller sensitive.
781 if (!m->caller_sensitive()) {
782 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
783 }
784 break;
785 default:
786 if (!m->is_ignored_by_security_stack_walk()) {
787 // We have reached the desired frame; return the holder class.
788 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
789 }
790 break;
791 }
792 }
793 return NULL;
794 JVM_END
795
796
797 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
798 JVMWrapper("JVM_FindPrimitiveClass");
799 oop mirror = NULL;
800 BasicType t = name2type(utf);
801 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
802 mirror = Universe::java_mirror(t);
803 }
804 if (mirror == NULL) {
805 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
806 } else {
807 return (jclass) JNIHandles::make_local(env, mirror);
808 }
809 JVM_END
810
811
812 // Returns a class loaded by the bootstrap class loader; or null
813 // if not found. ClassNotFoundException is not thrown.
814 // FindClassFromBootLoader is exported to the launcher for windows.
815 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
816 const char* name))
817 JVMWrapper("JVM_FindClassFromBootLoader");
818
819 // Java libraries should ensure that name is never null...
820 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
821 // It's impossible to create this class; the name cannot fit
822 // into the constant pool.
823 return NULL;
824 }
825
826 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
827 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
828 if (k == NULL) {
829 return NULL;
830 }
831
832 if (log_is_enabled(Debug, classresolve)) {
833 trace_class_resolution(k);
834 }
835 return (jclass) JNIHandles::make_local(env, k->java_mirror());
836 JVM_END
837
838 // Find a class with this name in this loader, using the caller's protection domain.
839 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
840 jboolean init, jobject loader,
841 jclass caller))
842 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
843 // Java libraries should ensure that name is never null...
844 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
845 // It's impossible to create this class; the name cannot fit
846 // into the constant pool.
847 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
848 }
849
850 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
851
852 oop loader_oop = JNIHandles::resolve(loader);
853 oop from_class = JNIHandles::resolve(caller);
854 oop protection_domain = NULL;
855 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
856 // NPE. Put it in another way, the bootstrap class loader has all permission and
857 // thus no checkPackageAccess equivalence in the VM class loader.
858 // The caller is also passed as NULL by the java code if there is no security
859 // manager to avoid the performance cost of getting the calling class.
860 if (from_class != NULL && loader_oop != NULL) {
861 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
862 }
863
864 Handle h_loader(THREAD, loader_oop);
865 Handle h_prot(THREAD, protection_domain);
866 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
867 h_prot, false, THREAD);
868
869 if (log_is_enabled(Debug, classresolve) && result != NULL) {
870 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
871 }
872 return result;
873 JVM_END
874
875 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
876 jboolean init, jclass from))
877 JVMWrapper("JVM_FindClassFromClass");
878 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
879 // It's impossible to create this class; the name cannot fit
880 // into the constant pool.
881 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
882 }
883 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
884 oop from_class_oop = JNIHandles::resolve(from);
885 Klass* from_class = (from_class_oop == NULL)
886 ? (Klass*)NULL
887 : java_lang_Class::as_Klass(from_class_oop);
888 oop class_loader = NULL;
889 oop protection_domain = NULL;
890 if (from_class != NULL) {
891 class_loader = from_class->class_loader();
892 protection_domain = from_class->protection_domain();
893 }
894 Handle h_loader(THREAD, class_loader);
895 Handle h_prot (THREAD, protection_domain);
896 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
897 h_prot, true, thread);
898
899 if (log_is_enabled(Debug, classresolve) && result != NULL) {
900 // this function is generally only used for class loading during verification.
901 ResourceMark rm;
902 oop from_mirror = JNIHandles::resolve_non_null(from);
903 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
904 const char * from_name = from_class->external_name();
905
906 oop mirror = JNIHandles::resolve_non_null(result);
907 Klass* to_class = java_lang_Class::as_Klass(mirror);
908 const char * to = to_class->external_name();
909 log_debug(classresolve)("%s %s (verification)", from_name, to);
910 }
911
912 return result;
913 JVM_END
914
915 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
916 if (loader.is_null()) {
917 return;
918 }
919
920 // check whether the current caller thread holds the lock or not.
921 // If not, increment the corresponding counter
922 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
923 ObjectSynchronizer::owner_self) {
924 counter->inc();
925 }
926 }
927
928 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
929 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
930 jobject loader, const jbyte *buf,
931 jsize len, jobject pd, const char *source,
932 TRAPS) {
933 if (source == NULL) source = "__JVM_DefineClass__";
934
935 assert(THREAD->is_Java_thread(), "must be a JavaThread");
936 JavaThread* jt = (JavaThread*) THREAD;
937
938 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
939 ClassLoader::perf_define_appclass_selftime(),
940 ClassLoader::perf_define_appclasses(),
941 jt->get_thread_stat()->perf_recursion_counts_addr(),
942 jt->get_thread_stat()->perf_timers_addr(),
943 PerfClassTraceTime::DEFINE_CLASS);
944
945 if (UsePerfData) {
946 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
947 }
948
949 // Since exceptions can be thrown, class initialization can take place
950 // if name is NULL no check for class name in .class stream has to be made.
951 TempNewSymbol class_name = NULL;
952 if (name != NULL) {
953 const int str_len = (int)strlen(name);
954 if (str_len > Symbol::max_length()) {
955 // It's impossible to create this class; the name cannot fit
956 // into the constant pool.
957 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
958 }
959 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
960 }
961
962 ResourceMark rm(THREAD);
963 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
964 Handle class_loader (THREAD, JNIHandles::resolve(loader));
965 if (UsePerfData) {
966 is_lock_held_by_thread(class_loader,
967 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
968 THREAD);
969 }
970 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
971 Klass* k = SystemDictionary::resolve_from_stream(class_name,
972 class_loader,
973 protection_domain,
974 &st,
975 CHECK_NULL);
976
977 if (log_is_enabled(Debug, classresolve) && k != NULL) {
978 trace_class_resolution(k);
979 }
980
981 return (jclass) JNIHandles::make_local(env, k->java_mirror());
982 }
983
984
985 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
986 JVMWrapper("JVM_DefineClass");
987
988 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
989 JVM_END
990
991
992 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
993 JVMWrapper("JVM_DefineClassWithSource");
994
995 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
996 JVM_END
997
998 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
999 JVMWrapper("JVM_FindLoadedClass");
1000 ResourceMark rm(THREAD);
1001
1002 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1003 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
1004
1005 const char* str = java_lang_String::as_utf8_string(string());
1006 // Sanity check, don't expect null
1007 if (str == NULL) return NULL;
1008
1009 const int str_len = (int)strlen(str);
1010 if (str_len > Symbol::max_length()) {
1011 // It's impossible to create this class; the name cannot fit
1012 // into the constant pool.
1013 return NULL;
1014 }
1015 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
1016
1017 // Security Note:
1018 // The Java level wrapper will perform the necessary security check allowing
1019 // us to pass the NULL as the initiating class loader.
1020 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1021 if (UsePerfData) {
1022 is_lock_held_by_thread(h_loader,
1023 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1024 THREAD);
1025 }
1026
1027 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1028 h_loader,
1029 Handle(),
1030 CHECK_NULL);
1031 #if INCLUDE_CDS
1032 if (k == NULL) {
1033 // If the class is not already loaded, try to see if it's in the shared
1034 // archive for the current classloader (h_loader).
1035 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
1036 klass_name, h_loader, CHECK_NULL);
1037 k = ik();
1038 }
1039 #endif
1040 return (k == NULL) ? NULL :
1041 (jclass) JNIHandles::make_local(env, k->java_mirror());
1042 JVM_END
1043
1044
1045 // Reflection support //////////////////////////////////////////////////////////////////////////////
1046
1047 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1048 assert (cls != NULL, "illegal class");
1049 JVMWrapper("JVM_GetClassName");
1050 JvmtiVMObjectAllocEventCollector oam;
1051 ResourceMark rm(THREAD);
1052 const char* name;
1053 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1054 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1055 } else {
1056 // Consider caching interned string in Klass
1057 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1058 assert(k->is_klass(), "just checking");
1059 name = k->external_name();
1060 }
1061 oop result = StringTable::intern((char*) name, CHECK_NULL);
1062 return (jstring) JNIHandles::make_local(env, result);
1063 JVM_END
1064
1065
1066 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1067 JVMWrapper("JVM_GetClassInterfaces");
1068 JvmtiVMObjectAllocEventCollector oam;
1069 oop mirror = JNIHandles::resolve_non_null(cls);
1070
1071 // Special handling for primitive objects
1072 if (java_lang_Class::is_primitive(mirror)) {
1073 // Primitive objects does not have any interfaces
1074 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1075 return (jobjectArray) JNIHandles::make_local(env, r);
1076 }
1077
1078 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
1079 // Figure size of result array
1080 int size;
1081 if (klass->is_instance_klass()) {
1082 size = InstanceKlass::cast(klass())->local_interfaces()->length();
1083 } else {
1084 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1085 size = 2;
1086 }
1087
1088 // Allocate result array
1089 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1090 objArrayHandle result (THREAD, r);
1091 // Fill in result
1092 if (klass->is_instance_klass()) {
1093 // Regular instance klass, fill in all local interfaces
1094 for (int index = 0; index < size; index++) {
1095 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
1096 result->obj_at_put(index, k->java_mirror());
1097 }
1098 } else {
1099 // All arrays implement java.lang.Cloneable and java.io.Serializable
1100 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1101 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1102 }
1103 return (jobjectArray) JNIHandles::make_local(env, result());
1104 JVM_END
1105
1106
1107 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1108 JVMWrapper("JVM_IsInterface");
1109 oop mirror = JNIHandles::resolve_non_null(cls);
1110 if (java_lang_Class::is_primitive(mirror)) {
1111 return JNI_FALSE;
1112 }
1113 Klass* k = java_lang_Class::as_Klass(mirror);
1114 jboolean result = k->is_interface();
1115 assert(!result || k->is_instance_klass(),
1116 "all interfaces are instance types");
1117 // The compiler intrinsic for isInterface tests the
1118 // Klass::_access_flags bits in the same way.
1119 return result;
1120 JVM_END
1121
1122
1123 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1124 JVMWrapper("JVM_GetClassSigners");
1125 JvmtiVMObjectAllocEventCollector oam;
1126 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1127 // There are no signers for primitive types
1128 return NULL;
1129 }
1130
1131 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1132
1133 // If there are no signers set in the class, or if the class
1134 // is an array, return NULL.
1135 if (signers == NULL) return NULL;
1136
1137 // copy of the signers array
1138 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1139 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1140 for (int index = 0; index < signers->length(); index++) {
1141 signers_copy->obj_at_put(index, signers->obj_at(index));
1142 }
1143
1144 // return the copy
1145 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1146 JVM_END
1147
1148
1149 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1150 JVMWrapper("JVM_SetClassSigners");
1151 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1152 // This call is ignored for primitive types and arrays.
1153 // Signers are only set once, ClassLoader.java, and thus shouldn't
1154 // be called with an array. Only the bootstrap loader creates arrays.
1155 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1156 if (k->is_instance_klass()) {
1157 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1158 }
1159 }
1160 JVM_END
1161
1162
1163 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1164 JVMWrapper("JVM_GetProtectionDomain");
1165 if (JNIHandles::resolve(cls) == NULL) {
1166 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1167 }
1168
1169 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1170 // Primitive types does not have a protection domain.
1171 return NULL;
1172 }
1173
1174 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1175 return (jobject) JNIHandles::make_local(env, pd);
1176 JVM_END
1177
1178
1179 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1180 // If there is a security manager and protection domain, check the access
1181 // in the protection domain, otherwise it is authorized.
1182 if (java_lang_System::has_security_manager()) {
1183
1184 // For bootstrapping, if pd implies method isn't in the JDK, allow
1185 // this context to revert to older behavior.
1186 // In this case the isAuthorized field in AccessControlContext is also not
1187 // present.
1188 if (Universe::protection_domain_implies_method() == NULL) {
1189 return true;
1190 }
1191
1192 // Whitelist certain access control contexts
1193 if (java_security_AccessControlContext::is_authorized(context)) {
1194 return true;
1195 }
1196
1197 oop prot = klass->protection_domain();
1198 if (prot != NULL) {
1199 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1200 // in the new wrapper.
1201 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1202 Handle h_prot(THREAD, prot);
1203 JavaValue result(T_BOOLEAN);
1204 JavaCallArguments args(h_prot);
1205 JavaCalls::call(&result, m, &args, CHECK_false);
1206 return (result.get_jboolean() != 0);
1207 }
1208 }
1209 return true;
1210 }
1211
1212 // Create an AccessControlContext with a protection domain with null codesource
1213 // and null permissions - which gives no permissions.
1214 oop create_dummy_access_control_context(TRAPS) {
1215 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1216 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1217 // Call constructor ProtectionDomain(null, null);
1218 JavaValue result(T_VOID);
1219 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1220 vmSymbols::object_initializer_name(),
1221 vmSymbols::codesource_permissioncollection_signature(),
1222 Handle(), Handle(), CHECK_NULL);
1223
1224 // new ProtectionDomain[] {pd};
1225 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1226 context->obj_at_put(0, obj());
1227
1228 // new AccessControlContext(new ProtectionDomain[] {pd})
1229 objArrayHandle h_context(THREAD, context);
1230 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1231 return acc;
1232 }
1233
1234 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1235 JVMWrapper("JVM_DoPrivileged");
1236
1237 if (action == NULL) {
1238 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1239 }
1240
1241 // Compute the frame initiating the do privileged operation and setup the privileged stack
1242 vframeStream vfst(thread);
1243 vfst.security_get_caller_frame(1);
1244
1245 if (vfst.at_end()) {
1246 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1247 }
1248
1249 Method* method = vfst.method();
1250 instanceKlassHandle klass (THREAD, method->method_holder());
1251
1252 // Check that action object understands "Object run()"
1253 Handle h_context;
1254 if (context != NULL) {
1255 h_context = Handle(THREAD, JNIHandles::resolve(context));
1256 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1257 if (!authorized) {
1258 // Create an unprivileged access control object and call it's run function
1259 // instead.
1260 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1261 h_context = Handle(THREAD, noprivs);
1262 }
1263 }
1264
1265 // Check that action object understands "Object run()"
1266 Handle object (THREAD, JNIHandles::resolve(action));
1267
1268 // get run() method
1269 Method* m_oop = object->klass()->uncached_lookup_method(
1270 vmSymbols::run_method_name(),
1271 vmSymbols::void_object_signature(),
1272 Klass::find_overpass);
1273 methodHandle m (THREAD, m_oop);
1274 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1275 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1276 }
1277
1278 // Stack allocated list of privileged stack elements
1279 PrivilegedElement pi;
1280 if (!vfst.at_end()) {
1281 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1282 thread->set_privileged_stack_top(&pi);
1283 }
1284
1285
1286 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1287 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1288 Handle pending_exception;
1289 JavaValue result(T_OBJECT);
1290 JavaCallArguments args(object);
1291 JavaCalls::call(&result, m, &args, THREAD);
1292
1293 // done with action, remove ourselves from the list
1294 if (!vfst.at_end()) {
1295 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1296 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1297 }
1298
1299 if (HAS_PENDING_EXCEPTION) {
1300 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1301 CLEAR_PENDING_EXCEPTION;
1302 // JVMTI has already reported the pending exception
1303 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1304 if (THREAD->is_Java_thread()) {
1305 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1306 }
1307 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1308 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1309 // Throw a java.security.PrivilegedActionException(Exception e) exception
1310 JavaCallArguments args(pending_exception);
1311 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1312 vmSymbols::exception_void_signature(),
1313 &args);
1314 }
1315 }
1316
1317 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1318 return JNIHandles::make_local(env, (oop) result.get_jobject());
1319 JVM_END
1320
1321
1322 // Returns the inherited_access_control_context field of the running thread.
1323 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1324 JVMWrapper("JVM_GetInheritedAccessControlContext");
1325 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1326 return JNIHandles::make_local(env, result);
1327 JVM_END
1328
1329 class RegisterArrayForGC {
1330 private:
1331 JavaThread *_thread;
1332 public:
1333 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1334 _thread = thread;
1335 _thread->register_array_for_gc(array);
1336 }
1337
1338 ~RegisterArrayForGC() {
1339 _thread->register_array_for_gc(NULL);
1340 }
1341 };
1342
1343
1344 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1345 JVMWrapper("JVM_GetStackAccessControlContext");
1346 if (!UsePrivilegedStack) return NULL;
1347
1348 ResourceMark rm(THREAD);
1349 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1350 JvmtiVMObjectAllocEventCollector oam;
1351
1352 // count the protection domains on the execution stack. We collapse
1353 // duplicate consecutive protection domains into a single one, as
1354 // well as stopping when we hit a privileged frame.
1355
1356 // Use vframeStream to iterate through Java frames
1357 vframeStream vfst(thread);
1358
1359 oop previous_protection_domain = NULL;
1360 Handle privileged_context(thread, NULL);
1361 bool is_privileged = false;
1362 oop protection_domain = NULL;
1363
1364 for(; !vfst.at_end(); vfst.next()) {
1365 // get method of frame
1366 Method* method = vfst.method();
1367 intptr_t* frame_id = vfst.frame_id();
1368
1369 // check the privileged frames to see if we have a match
1370 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1371 // this frame is privileged
1372 is_privileged = true;
1373 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1374 protection_domain = thread->privileged_stack_top()->protection_domain();
1375 } else {
1376 protection_domain = method->method_holder()->protection_domain();
1377 }
1378
1379 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1380 local_array->push(protection_domain);
1381 previous_protection_domain = protection_domain;
1382 }
1383
1384 if (is_privileged) break;
1385 }
1386
1387
1388 // either all the domains on the stack were system domains, or
1389 // we had a privileged system domain
1390 if (local_array->is_empty()) {
1391 if (is_privileged && privileged_context.is_null()) return NULL;
1392
1393 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1394 return JNIHandles::make_local(env, result);
1395 }
1396
1397 // the resource area must be registered in case of a gc
1398 RegisterArrayForGC ragc(thread, local_array);
1399 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1400 local_array->length(), CHECK_NULL);
1401 objArrayHandle h_context(thread, context);
1402 for (int index = 0; index < local_array->length(); index++) {
1403 h_context->obj_at_put(index, local_array->at(index));
1404 }
1405
1406 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1407
1408 return JNIHandles::make_local(env, result);
1409 JVM_END
1410
1411
1412 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1413 JVMWrapper("JVM_IsArrayClass");
1414 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1415 return (k != NULL) && k->is_array_klass() ? true : false;
1416 JVM_END
1417
1418
1419 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1420 JVMWrapper("JVM_IsPrimitiveClass");
1421 oop mirror = JNIHandles::resolve_non_null(cls);
1422 return (jboolean) java_lang_Class::is_primitive(mirror);
1423 JVM_END
1424
1425
1426 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1427 JVMWrapper("JVM_GetClassModifiers");
1428 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1429 // Primitive type
1430 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1431 }
1432
1433 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1434 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1435 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1436 return k->modifier_flags();
1437 JVM_END
1438
1439
1440 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1441
1442 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1443 JvmtiVMObjectAllocEventCollector oam;
1444 // ofClass is a reference to a java_lang_Class object. The mirror object
1445 // of an InstanceKlass
1446
1447 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1448 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1449 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1450 return (jobjectArray)JNIHandles::make_local(env, result);
1451 }
1452
1453 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1454 InnerClassesIterator iter(k);
1455
1456 if (iter.length() == 0) {
1457 // Neither an inner nor outer class
1458 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1459 return (jobjectArray)JNIHandles::make_local(env, result);
1460 }
1461
1462 // find inner class info
1463 constantPoolHandle cp(thread, k->constants());
1464 int length = iter.length();
1465
1466 // Allocate temp. result array
1467 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1468 objArrayHandle result (THREAD, r);
1469 int members = 0;
1470
1471 for (; !iter.done(); iter.next()) {
1472 int ioff = iter.inner_class_info_index();
1473 int ooff = iter.outer_class_info_index();
1474
1475 if (ioff != 0 && ooff != 0) {
1476 // Check to see if the name matches the class we're looking for
1477 // before attempting to find the class.
1478 if (cp->klass_name_at_matches(k, ooff)) {
1479 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1480 if (outer_klass == k()) {
1481 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1482 instanceKlassHandle inner_klass (THREAD, ik);
1483
1484 // Throws an exception if outer klass has not declared k as
1485 // an inner klass
1486 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1487
1488 result->obj_at_put(members, inner_klass->java_mirror());
1489 members++;
1490 }
1491 }
1492 }
1493 }
1494
1495 if (members != length) {
1496 // Return array of right length
1497 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1498 for(int i = 0; i < members; i++) {
1499 res->obj_at_put(i, result->obj_at(i));
1500 }
1501 return (jobjectArray)JNIHandles::make_local(env, res);
1502 }
1503
1504 return (jobjectArray)JNIHandles::make_local(env, result());
1505 JVM_END
1506
1507
1508 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1509 {
1510 // ofClass is a reference to a java_lang_Class object.
1511 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1512 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1513 return NULL;
1514 }
1515
1516 bool inner_is_member = false;
1517 Klass* outer_klass
1518 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1519 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1520 if (outer_klass == NULL) return NULL; // already a top-level class
1521 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1522 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1523 }
1524 JVM_END
1525
1526 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1527 {
1528 oop mirror = JNIHandles::resolve_non_null(cls);
1529 if (java_lang_Class::is_primitive(mirror) ||
1530 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1531 return NULL;
1532 }
1533 instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror)));
1534 int ooff = 0, noff = 0;
1535 if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) {
1536 if (noff != 0) {
1537 constantPoolHandle i_cp(thread, k->constants());
1538 Symbol* name = i_cp->symbol_at(noff);
1539 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1540 return (jstring) JNIHandles::make_local(env, str());
1541 }
1542 }
1543 return NULL;
1544 }
1545 JVM_END
1546
1547 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1548 assert (cls != NULL, "illegal class");
1549 JVMWrapper("JVM_GetClassSignature");
1550 JvmtiVMObjectAllocEventCollector oam;
1551 ResourceMark rm(THREAD);
1552 // Return null for arrays and primatives
1553 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1554 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1555 if (k->is_instance_klass()) {
1556 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1557 if (sym == NULL) return NULL;
1558 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1559 return (jstring) JNIHandles::make_local(env, str());
1560 }
1561 }
1562 return NULL;
1563 JVM_END
1564
1565
1566 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1567 assert (cls != NULL, "illegal class");
1568 JVMWrapper("JVM_GetClassAnnotations");
1569
1570 // Return null for arrays and primitives
1571 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1572 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1573 if (k->is_instance_klass()) {
1574 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1575 return (jbyteArray) JNIHandles::make_local(env, a);
1576 }
1577 }
1578 return NULL;
1579 JVM_END
1580
1581
1582 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1583 // some of this code was adapted from from jni_FromReflectedField
1584
1585 oop reflected = JNIHandles::resolve_non_null(field);
1586 oop mirror = java_lang_reflect_Field::clazz(reflected);
1587 Klass* k = java_lang_Class::as_Klass(mirror);
1588 int slot = java_lang_reflect_Field::slot(reflected);
1589 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1590
1591 KlassHandle kh(THREAD, k);
1592 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1593
1594 if (modifiers & JVM_ACC_STATIC) {
1595 // for static fields we only look in the current class
1596 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1597 assert(false, "cannot find static field");
1598 return false;
1599 }
1600 } else {
1601 // for instance fields we start with the current class and work
1602 // our way up through the superclass chain
1603 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1604 assert(false, "cannot find instance field");
1605 return false;
1606 }
1607 }
1608 return true;
1609 }
1610
1611 static Method* jvm_get_method_common(jobject method) {
1612 // some of this code was adapted from from jni_FromReflectedMethod
1613
1614 oop reflected = JNIHandles::resolve_non_null(method);
1615 oop mirror = NULL;
1616 int slot = 0;
1617
1618 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1619 mirror = java_lang_reflect_Constructor::clazz(reflected);
1620 slot = java_lang_reflect_Constructor::slot(reflected);
1621 } else {
1622 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1623 "wrong type");
1624 mirror = java_lang_reflect_Method::clazz(reflected);
1625 slot = java_lang_reflect_Method::slot(reflected);
1626 }
1627 Klass* k = java_lang_Class::as_Klass(mirror);
1628
1629 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1630 assert(m != NULL, "cannot find method");
1631 return m; // caller has to deal with NULL in product mode
1632 }
1633
1634 /* Type use annotations support (JDK 1.8) */
1635
1636 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1637 assert (cls != NULL, "illegal class");
1638 JVMWrapper("JVM_GetClassTypeAnnotations");
1639 ResourceMark rm(THREAD);
1640 // Return null for arrays and primitives
1641 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1642 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1643 if (k->is_instance_klass()) {
1644 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1645 if (type_annotations != NULL) {
1646 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1647 return (jbyteArray) JNIHandles::make_local(env, a);
1648 }
1649 }
1650 }
1651 return NULL;
1652 JVM_END
1653
1654 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1655 assert (method != NULL, "illegal method");
1656 JVMWrapper("JVM_GetMethodTypeAnnotations");
1657
1658 // method is a handle to a java.lang.reflect.Method object
1659 Method* m = jvm_get_method_common(method);
1660 if (m == NULL) {
1661 return NULL;
1662 }
1663
1664 AnnotationArray* type_annotations = m->type_annotations();
1665 if (type_annotations != NULL) {
1666 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1667 return (jbyteArray) JNIHandles::make_local(env, a);
1668 }
1669
1670 return NULL;
1671 JVM_END
1672
1673 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1674 assert (field != NULL, "illegal field");
1675 JVMWrapper("JVM_GetFieldTypeAnnotations");
1676
1677 fieldDescriptor fd;
1678 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1679 if (!gotFd) {
1680 return NULL;
1681 }
1682
1683 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1684 JVM_END
1685
1686 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1687 if (!cp->is_within_bounds(index)) {
1688 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1689 }
1690 }
1691
1692 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1693 {
1694 JVMWrapper("JVM_GetMethodParameters");
1695 // method is a handle to a java.lang.reflect.Method object
1696 Method* method_ptr = jvm_get_method_common(method);
1697 methodHandle mh (THREAD, method_ptr);
1698 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1699 const int num_params = mh->method_parameters_length();
1700
1701 if (num_params < 0) {
1702 // A -1 return value from method_parameters_length means there is no
1703 // parameter data. Return null to indicate this to the reflection
1704 // API.
1705 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1706 return (jobjectArray)NULL;
1707 } else {
1708 // Otherwise, we return something up to reflection, even if it is
1709 // a zero-length array. Why? Because in some cases this can
1710 // trigger a MalformedParametersException.
1711
1712 // make sure all the symbols are properly formatted
1713 for (int i = 0; i < num_params; i++) {
1714 MethodParametersElement* params = mh->method_parameters_start();
1715 int index = params[i].name_cp_index;
1716 bounds_check(mh->constants(), index, CHECK_NULL);
1717
1718 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1719 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1720 "Wrong type at constant pool index");
1721 }
1722
1723 }
1724
1725 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1726 objArrayHandle result (THREAD, result_oop);
1727
1728 for (int i = 0; i < num_params; i++) {
1729 MethodParametersElement* params = mh->method_parameters_start();
1730 // For a 0 index, give a NULL symbol
1731 Symbol* sym = 0 != params[i].name_cp_index ?
1732 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1733 int flags = params[i].flags;
1734 oop param = Reflection::new_parameter(reflected_method, i, sym,
1735 flags, CHECK_NULL);
1736 result->obj_at_put(i, param);
1737 }
1738 return (jobjectArray)JNIHandles::make_local(env, result());
1739 }
1740 }
1741 JVM_END
1742
1743 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1744
1745 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1746 {
1747 JVMWrapper("JVM_GetClassDeclaredFields");
1748 JvmtiVMObjectAllocEventCollector oam;
1749
1750 // Exclude primitive types and array types
1751 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1752 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1753 // Return empty array
1754 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1755 return (jobjectArray) JNIHandles::make_local(env, res);
1756 }
1757
1758 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1759 constantPoolHandle cp(THREAD, k->constants());
1760
1761 // Ensure class is linked
1762 k->link_class(CHECK_NULL);
1763
1764 // 4496456 We need to filter out java.lang.Throwable.backtrace
1765 bool skip_backtrace = false;
1766
1767 // Allocate result
1768 int num_fields;
1769
1770 if (publicOnly) {
1771 num_fields = 0;
1772 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
1773 if (fs.access_flags().is_public()) ++num_fields;
1774 }
1775 } else {
1776 num_fields = k->java_fields_count();
1777
1778 if (k() == SystemDictionary::Throwable_klass()) {
1779 num_fields--;
1780 skip_backtrace = true;
1781 }
1782 }
1783
1784 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1785 objArrayHandle result (THREAD, r);
1786
1787 int out_idx = 0;
1788 fieldDescriptor fd;
1789 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1790 if (skip_backtrace) {
1791 // 4496456 skip java.lang.Throwable.backtrace
1792 int offset = fs.offset();
1793 if (offset == java_lang_Throwable::get_backtrace_offset()) continue;
1794 }
1795
1796 if (!publicOnly || fs.access_flags().is_public()) {
1797 fd.reinitialize(k(), fs.index());
1798 oop field = Reflection::new_field(&fd, CHECK_NULL);
1799 result->obj_at_put(out_idx, field);
1800 ++out_idx;
1801 }
1802 }
1803 assert(out_idx == num_fields, "just checking");
1804 return (jobjectArray) JNIHandles::make_local(env, result());
1805 }
1806 JVM_END
1807
1808 static bool select_method(methodHandle method, bool want_constructor) {
1809 if (want_constructor) {
1810 return (method->is_initializer() && !method->is_static());
1811 } else {
1812 return (!method->is_initializer() && !method->is_overpass());
1813 }
1814 }
1815
1816 static jobjectArray get_class_declared_methods_helper(
1817 JNIEnv *env,
1818 jclass ofClass, jboolean publicOnly,
1819 bool want_constructor,
1820 Klass* klass, TRAPS) {
1821
1822 JvmtiVMObjectAllocEventCollector oam;
1823
1824 // Exclude primitive types and array types
1825 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1826 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1827 // Return empty array
1828 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1829 return (jobjectArray) JNIHandles::make_local(env, res);
1830 }
1831
1832 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1833
1834 // Ensure class is linked
1835 k->link_class(CHECK_NULL);
1836
1837 Array<Method*>* methods = k->methods();
1838 int methods_length = methods->length();
1839
1840 // Save original method_idnum in case of redefinition, which can change
1841 // the idnum of obsolete methods. The new method will have the same idnum
1842 // but if we refresh the methods array, the counts will be wrong.
1843 ResourceMark rm(THREAD);
1844 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1845 int num_methods = 0;
1846
1847 for (int i = 0; i < methods_length; i++) {
1848 methodHandle method(THREAD, methods->at(i));
1849 if (select_method(method, want_constructor)) {
1850 if (!publicOnly || method->is_public()) {
1851 idnums->push(method->method_idnum());
1852 ++num_methods;
1853 }
1854 }
1855 }
1856
1857 // Allocate result
1858 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1859 objArrayHandle result (THREAD, r);
1860
1861 // Now just put the methods that we selected above, but go by their idnum
1862 // in case of redefinition. The methods can be redefined at any safepoint,
1863 // so above when allocating the oop array and below when creating reflect
1864 // objects.
1865 for (int i = 0; i < num_methods; i++) {
1866 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1867 if (method.is_null()) {
1868 // Method may have been deleted and seems this API can handle null
1869 // Otherwise should probably put a method that throws NSME
1870 result->obj_at_put(i, NULL);
1871 } else {
1872 oop m;
1873 if (want_constructor) {
1874 m = Reflection::new_constructor(method, CHECK_NULL);
1875 } else {
1876 m = Reflection::new_method(method, false, CHECK_NULL);
1877 }
1878 result->obj_at_put(i, m);
1879 }
1880 }
1881
1882 return (jobjectArray) JNIHandles::make_local(env, result());
1883 }
1884
1885 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1886 {
1887 JVMWrapper("JVM_GetClassDeclaredMethods");
1888 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1889 /*want_constructor*/ false,
1890 SystemDictionary::reflect_Method_klass(), THREAD);
1891 }
1892 JVM_END
1893
1894 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1895 {
1896 JVMWrapper("JVM_GetClassDeclaredConstructors");
1897 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1898 /*want_constructor*/ true,
1899 SystemDictionary::reflect_Constructor_klass(), THREAD);
1900 }
1901 JVM_END
1902
1903 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1904 {
1905 JVMWrapper("JVM_GetClassAccessFlags");
1906 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1907 // Primitive type
1908 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1909 }
1910
1911 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1912 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1913 }
1914 JVM_END
1915
1916
1917 // Constant pool access //////////////////////////////////////////////////////////
1918
1919 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1920 {
1921 JVMWrapper("JVM_GetClassConstantPool");
1922 JvmtiVMObjectAllocEventCollector oam;
1923
1924 // Return null for primitives and arrays
1925 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1926 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1927 if (k->is_instance_klass()) {
1928 instanceKlassHandle k_h(THREAD, k);
1929 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL);
1930 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1931 return JNIHandles::make_local(jcp());
1932 }
1933 }
1934 return NULL;
1935 }
1936 JVM_END
1937
1938
1939 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1940 {
1941 JVMWrapper("JVM_ConstantPoolGetSize");
1942 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1943 return cp->length();
1944 }
1945 JVM_END
1946
1947
1948 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1949 {
1950 JVMWrapper("JVM_ConstantPoolGetClassAt");
1951 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1952 bounds_check(cp, index, CHECK_NULL);
1953 constantTag tag = cp->tag_at(index);
1954 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1955 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1956 }
1957 Klass* k = cp->klass_at(index, CHECK_NULL);
1958 return (jclass) JNIHandles::make_local(k->java_mirror());
1959 }
1960 JVM_END
1961
1962 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1963 {
1964 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1965 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1966 bounds_check(cp, index, CHECK_NULL);
1967 constantTag tag = cp->tag_at(index);
1968 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1969 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1970 }
1971 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1972 if (k == NULL) return NULL;
1973 return (jclass) JNIHandles::make_local(k->java_mirror());
1974 }
1975 JVM_END
1976
1977 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1978 constantTag tag = cp->tag_at(index);
1979 if (!tag.is_method() && !tag.is_interface_method()) {
1980 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1981 }
1982 int klass_ref = cp->uncached_klass_ref_index_at(index);
1983 Klass* k_o;
1984 if (force_resolution) {
1985 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1986 } else {
1987 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1988 if (k_o == NULL) return NULL;
1989 }
1990 instanceKlassHandle k(THREAD, k_o);
1991 Symbol* name = cp->uncached_name_ref_at(index);
1992 Symbol* sig = cp->uncached_signature_ref_at(index);
1993 methodHandle m (THREAD, k->find_method(name, sig));
1994 if (m.is_null()) {
1995 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1996 }
1997 oop method;
1998 if (!m->is_initializer() || m->is_static()) {
1999 method = Reflection::new_method(m, true, CHECK_NULL);
2000 } else {
2001 method = Reflection::new_constructor(m, CHECK_NULL);
2002 }
2003 return JNIHandles::make_local(method);
2004 }
2005
2006 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2007 {
2008 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2009 JvmtiVMObjectAllocEventCollector oam;
2010 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2011 bounds_check(cp, index, CHECK_NULL);
2012 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2013 return res;
2014 }
2015 JVM_END
2016
2017 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2018 {
2019 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2020 JvmtiVMObjectAllocEventCollector oam;
2021 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2022 bounds_check(cp, index, CHECK_NULL);
2023 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2024 return res;
2025 }
2026 JVM_END
2027
2028 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2029 constantTag tag = cp->tag_at(index);
2030 if (!tag.is_field()) {
2031 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2032 }
2033 int klass_ref = cp->uncached_klass_ref_index_at(index);
2034 Klass* k_o;
2035 if (force_resolution) {
2036 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2037 } else {
2038 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2039 if (k_o == NULL) return NULL;
2040 }
2041 instanceKlassHandle k(THREAD, k_o);
2042 Symbol* name = cp->uncached_name_ref_at(index);
2043 Symbol* sig = cp->uncached_signature_ref_at(index);
2044 fieldDescriptor fd;
2045 Klass* target_klass = k->find_field(name, sig, &fd);
2046 if (target_klass == NULL) {
2047 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2048 }
2049 oop field = Reflection::new_field(&fd, CHECK_NULL);
2050 return JNIHandles::make_local(field);
2051 }
2052
2053 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2054 {
2055 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2056 JvmtiVMObjectAllocEventCollector oam;
2057 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2058 bounds_check(cp, index, CHECK_NULL);
2059 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2060 return res;
2061 }
2062 JVM_END
2063
2064 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2065 {
2066 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2067 JvmtiVMObjectAllocEventCollector oam;
2068 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2069 bounds_check(cp, index, CHECK_NULL);
2070 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2071 return res;
2072 }
2073 JVM_END
2074
2075 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2076 {
2077 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2078 JvmtiVMObjectAllocEventCollector oam;
2079 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2080 bounds_check(cp, index, CHECK_NULL);
2081 constantTag tag = cp->tag_at(index);
2082 if (!tag.is_field_or_method()) {
2083 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2084 }
2085 int klass_ref = cp->uncached_klass_ref_index_at(index);
2086 Symbol* klass_name = cp->klass_name_at(klass_ref);
2087 Symbol* member_name = cp->uncached_name_ref_at(index);
2088 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2089 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2090 objArrayHandle dest(THREAD, dest_o);
2091 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2092 dest->obj_at_put(0, str());
2093 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2094 dest->obj_at_put(1, str());
2095 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2096 dest->obj_at_put(2, str());
2097 return (jobjectArray) JNIHandles::make_local(dest());
2098 }
2099 JVM_END
2100
2101 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2102 {
2103 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2104 JvmtiVMObjectAllocEventCollector oam;
2105 constantPoolHandle cp(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2106 bounds_check(cp, index, CHECK_0);
2107 constantTag tag = cp->tag_at(index);
2108 if (!tag.is_field_or_method()) {
2109 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2110 }
2111 return (jint) cp->uncached_klass_ref_index_at(index);
2112 }
2113 JVM_END
2114
2115 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2116 {
2117 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2118 JvmtiVMObjectAllocEventCollector oam;
2119 constantPoolHandle cp(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2120 bounds_check(cp, index, CHECK_0);
2121 constantTag tag = cp->tag_at(index);
2122 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2123 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2124 }
2125 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2126 }
2127 JVM_END
2128
2129 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2130 {
2131 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2132 JvmtiVMObjectAllocEventCollector oam;
2133 constantPoolHandle cp(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2134 bounds_check(cp, index, CHECK_NULL);
2135 constantTag tag = cp->tag_at(index);
2136 if (!tag.is_name_and_type()) {
2137 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2138 }
2139 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2140 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2141 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2142 objArrayHandle dest(THREAD, dest_o);
2143 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2144 dest->obj_at_put(0, str());
2145 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2146 dest->obj_at_put(1, str());
2147 return (jobjectArray) JNIHandles::make_local(dest());
2148 }
2149 JVM_END
2150
2151 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2152 {
2153 JVMWrapper("JVM_ConstantPoolGetIntAt");
2154 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2155 bounds_check(cp, index, CHECK_0);
2156 constantTag tag = cp->tag_at(index);
2157 if (!tag.is_int()) {
2158 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2159 }
2160 return cp->int_at(index);
2161 }
2162 JVM_END
2163
2164 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2165 {
2166 JVMWrapper("JVM_ConstantPoolGetLongAt");
2167 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2168 bounds_check(cp, index, CHECK_(0L));
2169 constantTag tag = cp->tag_at(index);
2170 if (!tag.is_long()) {
2171 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2172 }
2173 return cp->long_at(index);
2174 }
2175 JVM_END
2176
2177 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2178 {
2179 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2180 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2181 bounds_check(cp, index, CHECK_(0.0f));
2182 constantTag tag = cp->tag_at(index);
2183 if (!tag.is_float()) {
2184 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2185 }
2186 return cp->float_at(index);
2187 }
2188 JVM_END
2189
2190 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2191 {
2192 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2193 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2194 bounds_check(cp, index, CHECK_(0.0));
2195 constantTag tag = cp->tag_at(index);
2196 if (!tag.is_double()) {
2197 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2198 }
2199 return cp->double_at(index);
2200 }
2201 JVM_END
2202
2203 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2204 {
2205 JVMWrapper("JVM_ConstantPoolGetStringAt");
2206 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2207 bounds_check(cp, index, CHECK_NULL);
2208 constantTag tag = cp->tag_at(index);
2209 if (!tag.is_string()) {
2210 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2211 }
2212 oop str = cp->string_at(index, CHECK_NULL);
2213 return (jstring) JNIHandles::make_local(str);
2214 }
2215 JVM_END
2216
2217 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2218 {
2219 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2220 JvmtiVMObjectAllocEventCollector oam;
2221 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2222 bounds_check(cp, index, CHECK_NULL);
2223 constantTag tag = cp->tag_at(index);
2224 if (!tag.is_symbol()) {
2225 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2226 }
2227 Symbol* sym = cp->symbol_at(index);
2228 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2229 return (jstring) JNIHandles::make_local(str());
2230 }
2231 JVM_END
2232
2233 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2234 {
2235 JVMWrapper("JVM_ConstantPoolGetTagAt");
2236 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2237 bounds_check(cp, index, CHECK_0);
2238 constantTag tag = cp->tag_at(index);
2239 jbyte result = tag.value();
2240 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2241 // they are changed to the corresponding tags from the JVM spec, so that java code in
2242 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2243 if (tag.is_klass_or_reference()) {
2244 result = JVM_CONSTANT_Class;
2245 } else if (tag.is_string_index()) {
2246 result = JVM_CONSTANT_String;
2247 } else if (tag.is_method_type_in_error()) {
2248 result = JVM_CONSTANT_MethodType;
2249 } else if (tag.is_method_handle_in_error()) {
2250 result = JVM_CONSTANT_MethodHandle;
2251 }
2252 return result;
2253 }
2254 JVM_END
2255
2256 // Assertion support. //////////////////////////////////////////////////////////
2257
2258 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2259 JVMWrapper("JVM_DesiredAssertionStatus");
2260 assert(cls != NULL, "bad class");
2261
2262 oop r = JNIHandles::resolve(cls);
2263 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2264 if (java_lang_Class::is_primitive(r)) return false;
2265
2266 Klass* k = java_lang_Class::as_Klass(r);
2267 assert(k->is_instance_klass(), "must be an instance klass");
2268 if (!k->is_instance_klass()) return false;
2269
2270 ResourceMark rm(THREAD);
2271 const char* name = k->name()->as_C_string();
2272 bool system_class = k->class_loader() == NULL;
2273 return JavaAssertions::enabled(name, system_class);
2274
2275 JVM_END
2276
2277
2278 // Return a new AssertionStatusDirectives object with the fields filled in with
2279 // command-line assertion arguments (i.e., -ea, -da).
2280 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2281 JVMWrapper("JVM_AssertionStatusDirectives");
2282 JvmtiVMObjectAllocEventCollector oam;
2283 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2284 return JNIHandles::make_local(env, asd);
2285 JVM_END
2286
2287 // Verification ////////////////////////////////////////////////////////////////////////////////
2288
2289 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2290
2291 // RedefineClasses support: bug 6214132 caused verification to fail.
2292 // All functions from this section should call the jvmtiThreadSate function:
2293 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2294 // The function returns a Klass* of the _scratch_class if the verifier
2295 // was invoked in the middle of the class redefinition.
2296 // Otherwise it returns its argument value which is the _the_class Klass*.
2297 // Please, refer to the description in the jvmtiThreadSate.hpp.
2298
2299 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2300 JVMWrapper("JVM_GetClassNameUTF");
2301 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2302 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2303 return k->name()->as_utf8();
2304 JVM_END
2305
2306
2307 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2308 JVMWrapper("JVM_GetClassCPTypes");
2309 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2310 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2311 // types will have length zero if this is not an InstanceKlass
2312 // (length is determined by call to JVM_GetClassCPEntriesCount)
2313 if (k->is_instance_klass()) {
2314 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2315 for (int index = cp->length() - 1; index >= 0; index--) {
2316 constantTag tag = cp->tag_at(index);
2317 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2318 }
2319 }
2320 JVM_END
2321
2322
2323 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2324 JVMWrapper("JVM_GetClassCPEntriesCount");
2325 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2326 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2327 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2328 JVM_END
2329
2330
2331 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2332 JVMWrapper("JVM_GetClassFieldsCount");
2333 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2334 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2335 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2336 JVM_END
2337
2338
2339 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2340 JVMWrapper("JVM_GetClassMethodsCount");
2341 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2342 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2343 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2344 JVM_END
2345
2346
2347 // The following methods, used for the verifier, are never called with
2348 // array klasses, so a direct cast to InstanceKlass is safe.
2349 // Typically, these methods are called in a loop with bounds determined
2350 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2351 // zero for arrays.
2352 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2353 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2354 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2355 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2356 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2357 int length = method->checked_exceptions_length();
2358 if (length > 0) {
2359 CheckedExceptionElement* table= method->checked_exceptions_start();
2360 for (int i = 0; i < length; i++) {
2361 exceptions[i] = table[i].class_cp_index;
2362 }
2363 }
2364 JVM_END
2365
2366
2367 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2368 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2369 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2370 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2371 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2372 return method->checked_exceptions_length();
2373 JVM_END
2374
2375
2376 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2377 JVMWrapper("JVM_GetMethodIxByteCode");
2378 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2379 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2380 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2381 memcpy(code, method->code_base(), method->code_size());
2382 JVM_END
2383
2384
2385 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2386 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2387 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2388 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2389 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2390 return method->code_size();
2391 JVM_END
2392
2393
2394 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2395 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2396 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2397 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2398 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2399 ExceptionTable extable(method);
2400 entry->start_pc = extable.start_pc(entry_index);
2401 entry->end_pc = extable.end_pc(entry_index);
2402 entry->handler_pc = extable.handler_pc(entry_index);
2403 entry->catchType = extable.catch_type_index(entry_index);
2404 JVM_END
2405
2406
2407 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2408 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2409 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2410 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2411 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2412 return method->exception_table_length();
2413 JVM_END
2414
2415
2416 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2417 JVMWrapper("JVM_GetMethodIxModifiers");
2418 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2419 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2420 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2421 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2422 JVM_END
2423
2424
2425 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2426 JVMWrapper("JVM_GetFieldIxModifiers");
2427 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2428 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2429 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2430 JVM_END
2431
2432
2433 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2434 JVMWrapper("JVM_GetMethodIxLocalsCount");
2435 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2436 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2437 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2438 return method->max_locals();
2439 JVM_END
2440
2441
2442 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2443 JVMWrapper("JVM_GetMethodIxArgsSize");
2444 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2445 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2446 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2447 return method->size_of_parameters();
2448 JVM_END
2449
2450
2451 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2452 JVMWrapper("JVM_GetMethodIxMaxStack");
2453 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2454 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2455 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2456 return method->verifier_max_stack();
2457 JVM_END
2458
2459
2460 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2461 JVMWrapper("JVM_IsConstructorIx");
2462 ResourceMark rm(THREAD);
2463 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2464 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2465 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2466 return method->name() == vmSymbols::object_initializer_name();
2467 JVM_END
2468
2469
2470 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2471 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2472 ResourceMark rm(THREAD);
2473 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2474 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2475 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2476 return method->is_overpass();
2477 JVM_END
2478
2479 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2480 JVMWrapper("JVM_GetMethodIxIxUTF");
2481 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2482 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2483 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2484 return method->name()->as_utf8();
2485 JVM_END
2486
2487
2488 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2489 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2490 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2491 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2492 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2493 return method->signature()->as_utf8();
2494 JVM_END
2495
2496 /**
2497 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2498 * read entries in the constant pool. Since the old verifier always
2499 * works on a copy of the code, it will not see any rewriting that
2500 * may possibly occur in the middle of verification. So it is important
2501 * that nothing it calls tries to use the cpCache instead of the raw
2502 * constant pool, so we must use cp->uncached_x methods when appropriate.
2503 */
2504 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2505 JVMWrapper("JVM_GetCPFieldNameUTF");
2506 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2507 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2508 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2509 switch (cp->tag_at(cp_index).value()) {
2510 case JVM_CONSTANT_Fieldref:
2511 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2512 default:
2513 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2514 }
2515 ShouldNotReachHere();
2516 return NULL;
2517 JVM_END
2518
2519
2520 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2521 JVMWrapper("JVM_GetCPMethodNameUTF");
2522 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2523 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2524 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2525 switch (cp->tag_at(cp_index).value()) {
2526 case JVM_CONSTANT_InterfaceMethodref:
2527 case JVM_CONSTANT_Methodref:
2528 case JVM_CONSTANT_NameAndType: // for invokedynamic
2529 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2530 default:
2531 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2532 }
2533 ShouldNotReachHere();
2534 return NULL;
2535 JVM_END
2536
2537
2538 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2539 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2540 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2541 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2542 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2543 switch (cp->tag_at(cp_index).value()) {
2544 case JVM_CONSTANT_InterfaceMethodref:
2545 case JVM_CONSTANT_Methodref:
2546 case JVM_CONSTANT_NameAndType: // for invokedynamic
2547 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2548 default:
2549 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2550 }
2551 ShouldNotReachHere();
2552 return NULL;
2553 JVM_END
2554
2555
2556 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2557 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2558 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2559 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2560 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2561 switch (cp->tag_at(cp_index).value()) {
2562 case JVM_CONSTANT_Fieldref:
2563 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2564 default:
2565 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2566 }
2567 ShouldNotReachHere();
2568 return NULL;
2569 JVM_END
2570
2571
2572 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2573 JVMWrapper("JVM_GetCPClassNameUTF");
2574 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2575 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2576 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2577 Symbol* classname = cp->klass_name_at(cp_index);
2578 return classname->as_utf8();
2579 JVM_END
2580
2581
2582 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2583 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2584 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2585 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2586 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2587 switch (cp->tag_at(cp_index).value()) {
2588 case JVM_CONSTANT_Fieldref: {
2589 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2590 Symbol* classname = cp->klass_name_at(class_index);
2591 return classname->as_utf8();
2592 }
2593 default:
2594 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2595 }
2596 ShouldNotReachHere();
2597 return NULL;
2598 JVM_END
2599
2600
2601 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2602 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2603 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2604 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2605 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2606 switch (cp->tag_at(cp_index).value()) {
2607 case JVM_CONSTANT_Methodref:
2608 case JVM_CONSTANT_InterfaceMethodref: {
2609 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2610 Symbol* classname = cp->klass_name_at(class_index);
2611 return classname->as_utf8();
2612 }
2613 default:
2614 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2615 }
2616 ShouldNotReachHere();
2617 return NULL;
2618 JVM_END
2619
2620
2621 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2622 JVMWrapper("JVM_GetCPFieldModifiers");
2623 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2624 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2625 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2626 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2627 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2628 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2629 switch (cp->tag_at(cp_index).value()) {
2630 case JVM_CONSTANT_Fieldref: {
2631 Symbol* name = cp->uncached_name_ref_at(cp_index);
2632 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2633 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2634 if (fs.name() == name && fs.signature() == signature) {
2635 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2636 }
2637 }
2638 return -1;
2639 }
2640 default:
2641 fatal("JVM_GetCPFieldModifiers: illegal constant");
2642 }
2643 ShouldNotReachHere();
2644 return 0;
2645 JVM_END
2646
2647
2648 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2649 JVMWrapper("JVM_GetCPMethodModifiers");
2650 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2651 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2652 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2653 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2654 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2655 switch (cp->tag_at(cp_index).value()) {
2656 case JVM_CONSTANT_Methodref:
2657 case JVM_CONSTANT_InterfaceMethodref: {
2658 Symbol* name = cp->uncached_name_ref_at(cp_index);
2659 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2660 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2661 int methods_count = methods->length();
2662 for (int i = 0; i < methods_count; i++) {
2663 Method* method = methods->at(i);
2664 if (method->name() == name && method->signature() == signature) {
2665 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2666 }
2667 }
2668 return -1;
2669 }
2670 default:
2671 fatal("JVM_GetCPMethodModifiers: illegal constant");
2672 }
2673 ShouldNotReachHere();
2674 return 0;
2675 JVM_END
2676
2677
2678 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2679
2680 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2681 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2682 JVM_END
2683
2684
2685 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2686 JVMWrapper("JVM_IsSameClassPackage");
2687 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2688 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2689 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2690 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2691 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2692 JVM_END
2693
2694 // Printing support //////////////////////////////////////////////////
2695 extern "C" {
2696
2697 ATTRIBUTE_PRINTF(3, 0)
2698 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2699 // see bug 4399518, 4417214
2700 if ((intptr_t)count <= 0) return -1;
2701
2702 int result = vsnprintf(str, count, fmt, args);
2703 // Note: on truncation vsnprintf(3) on Unix returns numbers of
2704 // characters which would have been written had the buffer been large
2705 // enough; on Windows, it returns -1. We handle both cases here and
2706 // always return -1, and perform null termination.
2707 if ((result > 0 && (size_t)result >= count) || result == -1) {
2708 str[count - 1] = '\0';
2709 result = -1;
2710 }
2711
2712 return result;
2713 }
2714
2715 ATTRIBUTE_PRINTF(3, 0)
2716 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2717 va_list args;
2718 int len;
2719 va_start(args, fmt);
2720 len = jio_vsnprintf(str, count, fmt, args);
2721 va_end(args);
2722 return len;
2723 }
2724
2725 ATTRIBUTE_PRINTF(2,3)
2726 int jio_fprintf(FILE* f, const char *fmt, ...) {
2727 int len;
2728 va_list args;
2729 va_start(args, fmt);
2730 len = jio_vfprintf(f, fmt, args);
2731 va_end(args);
2732 return len;
2733 }
2734
2735 ATTRIBUTE_PRINTF(2, 0)
2736 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2737 if (Arguments::vfprintf_hook() != NULL) {
2738 return Arguments::vfprintf_hook()(f, fmt, args);
2739 } else {
2740 return vfprintf(f, fmt, args);
2741 }
2742 }
2743
2744 ATTRIBUTE_PRINTF(1, 2)
2745 JNIEXPORT int jio_printf(const char *fmt, ...) {
2746 int len;
2747 va_list args;
2748 va_start(args, fmt);
2749 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2750 va_end(args);
2751 return len;
2752 }
2753
2754
2755 // HotSpot specific jio method
2756 void jio_print(const char* s) {
2757 // Try to make this function as atomic as possible.
2758 if (Arguments::vfprintf_hook() != NULL) {
2759 jio_fprintf(defaultStream::output_stream(), "%s", s);
2760 } else {
2761 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2762 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2763 }
2764 }
2765
2766 } // Extern C
2767
2768 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2769
2770 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2771 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2772 // OSThread objects. The exception to this rule is when the target object is the thread
2773 // doing the operation, in which case we know that the thread won't exit until the
2774 // operation is done (all exits being voluntary). There are a few cases where it is
2775 // rather silly to do operations on yourself, like resuming yourself or asking whether
2776 // you are alive. While these can still happen, they are not subject to deadlocks if
2777 // the lock is held while the operation occurs (this is not the case for suspend, for
2778 // instance), and are very unlikely. Because IsAlive needs to be fast and its
2779 // implementation is local to this file, we always lock Threads_lock for that one.
2780
2781 static void thread_entry(JavaThread* thread, TRAPS) {
2782 HandleMark hm(THREAD);
2783 Handle obj(THREAD, thread->threadObj());
2784 JavaValue result(T_VOID);
2785 JavaCalls::call_virtual(&result,
2786 obj,
2787 KlassHandle(THREAD, SystemDictionary::Thread_klass()),
2788 vmSymbols::run_method_name(),
2789 vmSymbols::void_method_signature(),
2790 THREAD);
2791 }
2792
2793
2794 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2795 JVMWrapper("JVM_StartThread");
2796 JavaThread *native_thread = NULL;
2797
2798 // We cannot hold the Threads_lock when we throw an exception,
2799 // due to rank ordering issues. Example: we might need to grab the
2800 // Heap_lock while we construct the exception.
2801 bool throw_illegal_thread_state = false;
2802
2803 // We must release the Threads_lock before we can post a jvmti event
2804 // in Thread::start.
2805 {
2806 // Ensure that the C++ Thread and OSThread structures aren't freed before
2807 // we operate.
2808 MutexLocker mu(Threads_lock);
2809
2810 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2811 // re-starting an already started thread, so we should usually find
2812 // that the JavaThread is null. However for a JNI attached thread
2813 // there is a small window between the Thread object being created
2814 // (with its JavaThread set) and the update to its threadStatus, so we
2815 // have to check for this
2816 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2817 throw_illegal_thread_state = true;
2818 } else {
2819 // We could also check the stillborn flag to see if this thread was already stopped, but
2820 // for historical reasons we let the thread detect that itself when it starts running
2821
2822 jlong size =
2823 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2824 // Allocate the C++ Thread structure and create the native thread. The
2825 // stack size retrieved from java is signed, but the constructor takes
2826 // size_t (an unsigned type), so avoid passing negative values which would
2827 // result in really large stacks.
2828 size_t sz = size > 0 ? (size_t) size : 0;
2829 native_thread = new JavaThread(&thread_entry, sz);
2830
2831 // At this point it may be possible that no osthread was created for the
2832 // JavaThread due to lack of memory. Check for this situation and throw
2833 // an exception if necessary. Eventually we may want to change this so
2834 // that we only grab the lock if the thread was created successfully -
2835 // then we can also do this check and throw the exception in the
2836 // JavaThread constructor.
2837 if (native_thread->osthread() != NULL) {
2838 // Note: the current thread is not being used within "prepare".
2839 native_thread->prepare(jthread);
2840 }
2841 }
2842 }
2843
2844 if (throw_illegal_thread_state) {
2845 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2846 }
2847
2848 assert(native_thread != NULL, "Starting null thread?");
2849
2850 if (native_thread->osthread() == NULL) {
2851 // No one should hold a reference to the 'native_thread'.
2852 delete native_thread;
2853 if (JvmtiExport::should_post_resource_exhausted()) {
2854 JvmtiExport::post_resource_exhausted(
2855 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2856 os::native_thread_creation_failed_msg());
2857 }
2858 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2859 os::native_thread_creation_failed_msg());
2860 }
2861
2862 Thread::start(native_thread);
2863
2864 JVM_END
2865
2866 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2867 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2868 // but is thought to be reliable and simple. In the case, where the receiver is the
2869 // same thread as the sender, no safepoint is needed.
2870 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2871 JVMWrapper("JVM_StopThread");
2872
2873 oop java_throwable = JNIHandles::resolve(throwable);
2874 if (java_throwable == NULL) {
2875 THROW(vmSymbols::java_lang_NullPointerException());
2876 }
2877 oop java_thread = JNIHandles::resolve_non_null(jthread);
2878 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2879 Events::log_exception(JavaThread::current(),
2880 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2881 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2882 // First check if thread is alive
2883 if (receiver != NULL) {
2884 // Check if exception is getting thrown at self (use oop equality, since the
2885 // target object might exit)
2886 if (java_thread == thread->threadObj()) {
2887 THROW_OOP(java_throwable);
2888 } else {
2889 // Enques a VM_Operation to stop all threads and then deliver the exception...
2890 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2891 }
2892 }
2893 else {
2894 // Either:
2895 // - target thread has not been started before being stopped, or
2896 // - target thread already terminated
2897 // We could read the threadStatus to determine which case it is
2898 // but that is overkill as it doesn't matter. We must set the
2899 // stillborn flag for the first case, and if the thread has already
2900 // exited setting this flag has no affect
2901 java_lang_Thread::set_stillborn(java_thread);
2902 }
2903 JVM_END
2904
2905
2906 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2907 JVMWrapper("JVM_IsThreadAlive");
2908
2909 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2910 return java_lang_Thread::is_alive(thread_oop);
2911 JVM_END
2912
2913
2914 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2915 JVMWrapper("JVM_SuspendThread");
2916 oop java_thread = JNIHandles::resolve_non_null(jthread);
2917 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2918
2919 if (receiver != NULL) {
2920 // thread has run and has not exited (still on threads list)
2921
2922 {
2923 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2924 if (receiver->is_external_suspend()) {
2925 // Don't allow nested external suspend requests. We can't return
2926 // an error from this interface so just ignore the problem.
2927 return;
2928 }
2929 if (receiver->is_exiting()) { // thread is in the process of exiting
2930 return;
2931 }
2932 receiver->set_external_suspend();
2933 }
2934
2935 // java_suspend() will catch threads in the process of exiting
2936 // and will ignore them.
2937 receiver->java_suspend();
2938
2939 // It would be nice to have the following assertion in all the
2940 // time, but it is possible for a racing resume request to have
2941 // resumed this thread right after we suspended it. Temporarily
2942 // enable this assertion if you are chasing a different kind of
2943 // bug.
2944 //
2945 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2946 // receiver->is_being_ext_suspended(), "thread is not suspended");
2947 }
2948 JVM_END
2949
2950
2951 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2952 JVMWrapper("JVM_ResumeThread");
2953 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2954 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2955 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2956 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2957 // looks at it.
2958 MutexLocker ml(Threads_lock);
2959 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2960 if (thr != NULL) {
2961 // the thread has run and is not in the process of exiting
2962 thr->java_resume();
2963 }
2964 JVM_END
2965
2966
2967 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2968 JVMWrapper("JVM_SetThreadPriority");
2969 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2970 MutexLocker ml(Threads_lock);
2971 oop java_thread = JNIHandles::resolve_non_null(jthread);
2972 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2973 JavaThread* thr = java_lang_Thread::thread(java_thread);
2974 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
2975 Thread::set_priority(thr, (ThreadPriority)prio);
2976 }
2977 JVM_END
2978
2979
2980 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2981 JVMWrapper("JVM_Yield");
2982 if (os::dont_yield()) return;
2983 HOTSPOT_THREAD_YIELD();
2984
2985 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
2986 // Critical for similar threading behaviour
2987 if (ConvertYieldToSleep) {
2988 os::sleep(thread, MinSleepInterval, false);
2989 } else {
2990 os::naked_yield();
2991 }
2992 JVM_END
2993
2994
2995 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2996 JVMWrapper("JVM_Sleep");
2997
2998 if (millis < 0) {
2999 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3000 }
3001
3002 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3003 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3004 }
3005
3006 // Save current thread state and restore it at the end of this block.
3007 // And set new thread state to SLEEPING.
3008 JavaThreadSleepState jtss(thread);
3009
3010 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3011
3012 EventThreadSleep event;
3013
3014 if (millis == 0) {
3015 // When ConvertSleepToYield is on, this matches the classic VM implementation of
3016 // JVM_Sleep. Critical for similar threading behaviour (Win32)
3017 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
3018 // for SOLARIS
3019 if (ConvertSleepToYield) {
3020 os::naked_yield();
3021 } else {
3022 ThreadState old_state = thread->osthread()->get_state();
3023 thread->osthread()->set_state(SLEEPING);
3024 os::sleep(thread, MinSleepInterval, false);
3025 thread->osthread()->set_state(old_state);
3026 }
3027 } else {
3028 ThreadState old_state = thread->osthread()->get_state();
3029 thread->osthread()->set_state(SLEEPING);
3030 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3031 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3032 // us while we were sleeping. We do not overwrite those.
3033 if (!HAS_PENDING_EXCEPTION) {
3034 if (event.should_commit()) {
3035 event.set_time(millis);
3036 event.commit();
3037 }
3038 HOTSPOT_THREAD_SLEEP_END(1);
3039
3040 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3041 // to properly restore the thread state. That's likely wrong.
3042 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3043 }
3044 }
3045 thread->osthread()->set_state(old_state);
3046 }
3047 if (event.should_commit()) {
3048 event.set_time(millis);
3049 event.commit();
3050 }
3051 HOTSPOT_THREAD_SLEEP_END(0);
3052 JVM_END
3053
3054 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3055 JVMWrapper("JVM_CurrentThread");
3056 oop jthread = thread->threadObj();
3057 assert (thread != NULL, "no current thread!");
3058 return JNIHandles::make_local(env, jthread);
3059 JVM_END
3060
3061
3062 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3063 JVMWrapper("JVM_CountStackFrames");
3064
3065 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3066 oop java_thread = JNIHandles::resolve_non_null(jthread);
3067 bool throw_illegal_thread_state = false;
3068 int count = 0;
3069
3070 {
3071 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3072 // We need to re-resolve the java_thread, since a GC might have happened during the
3073 // acquire of the lock
3074 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3075
3076 if (thr == NULL) {
3077 // do nothing
3078 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
3079 // Check whether this java thread has been suspended already. If not, throws
3080 // IllegalThreadStateException. We defer to throw that exception until
3081 // Threads_lock is released since loading exception class has to leave VM.
3082 // The correct way to test a thread is actually suspended is
3083 // wait_for_ext_suspend_completion(), but we can't call that while holding
3084 // the Threads_lock. The above tests are sufficient for our purposes
3085 // provided the walkability of the stack is stable - which it isn't
3086 // 100% but close enough for most practical purposes.
3087 throw_illegal_thread_state = true;
3088 } else {
3089 // Count all java activation, i.e., number of vframes
3090 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
3091 // Native frames are not counted
3092 if (!vfst.method()->is_native()) count++;
3093 }
3094 }
3095 }
3096
3097 if (throw_illegal_thread_state) {
3098 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3099 "this thread is not suspended");
3100 }
3101 return count;
3102 JVM_END
3103
3104 // Consider: A better way to implement JVM_Interrupt() is to acquire
3105 // Threads_lock to resolve the jthread into a Thread pointer, fetch
3106 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
3107 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
3108 // outside the critical section. Threads_lock is hot so we want to minimize
3109 // the hold-time. A cleaner interface would be to decompose interrupt into
3110 // two steps. The 1st phase, performed under Threads_lock, would return
3111 // a closure that'd be invoked after Threads_lock was dropped.
3112 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
3113 // admit spurious wakeups.
3114
3115 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3116 JVMWrapper("JVM_Interrupt");
3117
3118 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3119 oop java_thread = JNIHandles::resolve_non_null(jthread);
3120 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3121 // We need to re-resolve the java_thread, since a GC might have happened during the
3122 // acquire of the lock
3123 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3124 if (thr != NULL) {
3125 Thread::interrupt(thr);
3126 }
3127 JVM_END
3128
3129
3130 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3131 JVMWrapper("JVM_IsInterrupted");
3132
3133 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3134 oop java_thread = JNIHandles::resolve_non_null(jthread);
3135 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3136 // We need to re-resolve the java_thread, since a GC might have happened during the
3137 // acquire of the lock
3138 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3139 if (thr == NULL) {
3140 return JNI_FALSE;
3141 } else {
3142 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3143 }
3144 JVM_END
3145
3146
3147 // Return true iff the current thread has locked the object passed in
3148
3149 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3150 JVMWrapper("JVM_HoldsLock");
3151 assert(THREAD->is_Java_thread(), "sanity check");
3152 if (obj == NULL) {
3153 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3154 }
3155 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3156 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3157 JVM_END
3158
3159
3160 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3161 JVMWrapper("JVM_DumpAllStacks");
3162 VM_PrintThreads op;
3163 VMThread::execute(&op);
3164 if (JvmtiExport::should_post_data_dump()) {
3165 JvmtiExport::post_data_dump();
3166 }
3167 JVM_END
3168
3169 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3170 JVMWrapper("JVM_SetNativeThreadName");
3171 ResourceMark rm(THREAD);
3172 oop java_thread = JNIHandles::resolve_non_null(jthread);
3173 JavaThread* thr = java_lang_Thread::thread(java_thread);
3174 // Thread naming only supported for the current thread, doesn't work for
3175 // target threads.
3176 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3177 // we don't set the name of an attached thread to avoid stepping
3178 // on other programs
3179 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3180 os::set_native_thread_name(thread_name);
3181 }
3182 JVM_END
3183
3184 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3185
3186 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3187 assert(jthread->is_Java_thread(), "must be a Java thread");
3188 if (jthread->privileged_stack_top() == NULL) return false;
3189 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3190 oop loader = jthread->privileged_stack_top()->class_loader();
3191 if (loader == NULL) return true;
3192 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3193 if (trusted) return true;
3194 }
3195 return false;
3196 }
3197
3198 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3199 JVMWrapper("JVM_CurrentLoadedClass");
3200 ResourceMark rm(THREAD);
3201
3202 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3203 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3204 bool trusted = is_trusted_frame(thread, &vfst);
3205 if (trusted) return NULL;
3206
3207 Method* m = vfst.method();
3208 if (!m->is_native()) {
3209 InstanceKlass* holder = m->method_holder();
3210 oop loader = holder->class_loader();
3211 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3212 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3213 }
3214 }
3215 }
3216 return NULL;
3217 JVM_END
3218
3219
3220 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3221 JVMWrapper("JVM_CurrentClassLoader");
3222 ResourceMark rm(THREAD);
3223
3224 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3225
3226 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3227 bool trusted = is_trusted_frame(thread, &vfst);
3228 if (trusted) return NULL;
3229
3230 Method* m = vfst.method();
3231 if (!m->is_native()) {
3232 InstanceKlass* holder = m->method_holder();
3233 assert(holder->is_klass(), "just checking");
3234 oop loader = holder->class_loader();
3235 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3236 return JNIHandles::make_local(env, loader);
3237 }
3238 }
3239 }
3240 return NULL;
3241 JVM_END
3242
3243
3244 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3245 JVMWrapper("JVM_GetClassContext");
3246 ResourceMark rm(THREAD);
3247 JvmtiVMObjectAllocEventCollector oam;
3248 vframeStream vfst(thread);
3249
3250 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3251 // This must only be called from SecurityManager.getClassContext
3252 Method* m = vfst.method();
3253 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3254 m->name() == vmSymbols::getClassContext_name() &&
3255 m->signature() == vmSymbols::void_class_array_signature())) {
3256 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3257 }
3258 }
3259
3260 // Collect method holders
3261 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3262 for (; !vfst.at_end(); vfst.security_next()) {
3263 Method* m = vfst.method();
3264 // Native frames are not returned
3265 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3266 Klass* holder = m->method_holder();
3267 assert(holder->is_klass(), "just checking");
3268 klass_array->append(holder);
3269 }
3270 }
3271
3272 // Create result array of type [Ljava/lang/Class;
3273 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3274 // Fill in mirrors corresponding to method holders
3275 for (int i = 0; i < klass_array->length(); i++) {
3276 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3277 }
3278
3279 return (jobjectArray) JNIHandles::make_local(env, result);
3280 JVM_END
3281
3282
3283 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3284 JVMWrapper("JVM_ClassDepth");
3285 ResourceMark rm(THREAD);
3286 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3287 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3288
3289 const char* str = java_lang_String::as_utf8_string(class_name_str());
3290 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3291 if (class_name_sym == NULL) {
3292 return -1;
3293 }
3294
3295 int depth = 0;
3296
3297 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3298 if (!vfst.method()->is_native()) {
3299 InstanceKlass* holder = vfst.method()->method_holder();
3300 assert(holder->is_klass(), "just checking");
3301 if (holder->name() == class_name_sym) {
3302 return depth;
3303 }
3304 depth++;
3305 }
3306 }
3307 return -1;
3308 JVM_END
3309
3310
3311 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3312 JVMWrapper("JVM_ClassLoaderDepth");
3313 ResourceMark rm(THREAD);
3314 int depth = 0;
3315 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3316 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3317 bool trusted = is_trusted_frame(thread, &vfst);
3318 if (trusted) return -1;
3319
3320 Method* m = vfst.method();
3321 if (!m->is_native()) {
3322 InstanceKlass* holder = m->method_holder();
3323 assert(holder->is_klass(), "just checking");
3324 oop loader = holder->class_loader();
3325 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3326 return depth;
3327 }
3328 depth++;
3329 }
3330 }
3331 return -1;
3332 JVM_END
3333
3334
3335 // java.lang.Package ////////////////////////////////////////////////////////////////
3336
3337
3338 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3339 JVMWrapper("JVM_GetSystemPackage");
3340 ResourceMark rm(THREAD);
3341 JvmtiVMObjectAllocEventCollector oam;
3342 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3343 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3344 return (jstring) JNIHandles::make_local(result);
3345 JVM_END
3346
3347
3348 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3349 JVMWrapper("JVM_GetSystemPackages");
3350 JvmtiVMObjectAllocEventCollector oam;
3351 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3352 return (jobjectArray) JNIHandles::make_local(result);
3353 JVM_END
3354
3355
3356 // ObjectInputStream ///////////////////////////////////////////////////////////////
3357
3358 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3359 if (current_class == NULL) {
3360 return true;
3361 }
3362 if ((current_class == field_class) || access.is_public()) {
3363 return true;
3364 }
3365
3366 if (access.is_protected()) {
3367 // See if current_class is a subclass of field_class
3368 if (current_class->is_subclass_of(field_class)) {
3369 return true;
3370 }
3371 }
3372
3373 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3374 }
3375
3376 // Return the first non-null class loader up the execution stack, or null
3377 // if only code from the null class loader is on the stack.
3378
3379 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3380 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3381 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3382 oop loader = vfst.method()->method_holder()->class_loader();
3383 if (loader != NULL) {
3384 return JNIHandles::make_local(env, loader);
3385 }
3386 }
3387 return NULL;
3388 JVM_END
3389
3390
3391 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3392
3393
3394 // resolve array handle and check arguments
3395 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3396 if (arr == NULL) {
3397 THROW_0(vmSymbols::java_lang_NullPointerException());
3398 }
3399 oop a = JNIHandles::resolve_non_null(arr);
3400 if (!a->is_array()) {
3401 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3402 } else if (type_array_only && !a->is_typeArray()) {
3403 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3404 }
3405 return arrayOop(a);
3406 }
3407
3408
3409 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3410 JVMWrapper("JVM_GetArrayLength");
3411 arrayOop a = check_array(env, arr, false, CHECK_0);
3412 return a->length();
3413 JVM_END
3414
3415
3416 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3417 JVMWrapper("JVM_Array_Get");
3418 JvmtiVMObjectAllocEventCollector oam;
3419 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3420 jvalue value;
3421 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3422 oop box = Reflection::box(&value, type, CHECK_NULL);
3423 return JNIHandles::make_local(env, box);
3424 JVM_END
3425
3426
3427 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3428 JVMWrapper("JVM_GetPrimitiveArrayElement");
3429 jvalue value;
3430 value.i = 0; // to initialize value before getting used in CHECK
3431 arrayOop a = check_array(env, arr, true, CHECK_(value));
3432 assert(a->is_typeArray(), "just checking");
3433 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3434 BasicType wide_type = (BasicType) wCode;
3435 if (type != wide_type) {
3436 Reflection::widen(&value, type, wide_type, CHECK_(value));
3437 }
3438 return value;
3439 JVM_END
3440
3441
3442 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3443 JVMWrapper("JVM_SetArrayElement");
3444 arrayOop a = check_array(env, arr, false, CHECK);
3445 oop box = JNIHandles::resolve(val);
3446 jvalue value;
3447 value.i = 0; // to initialize value before getting used in CHECK
3448 BasicType value_type;
3449 if (a->is_objArray()) {
3450 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3451 value_type = Reflection::unbox_for_regular_object(box, &value);
3452 } else {
3453 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3454 }
3455 Reflection::array_set(&value, a, index, value_type, CHECK);
3456 JVM_END
3457
3458
3459 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3460 JVMWrapper("JVM_SetPrimitiveArrayElement");
3461 arrayOop a = check_array(env, arr, true, CHECK);
3462 assert(a->is_typeArray(), "just checking");
3463 BasicType value_type = (BasicType) vCode;
3464 Reflection::array_set(&v, a, index, value_type, CHECK);
3465 JVM_END
3466
3467
3468 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3469 JVMWrapper("JVM_NewArray");
3470 JvmtiVMObjectAllocEventCollector oam;
3471 oop element_mirror = JNIHandles::resolve(eltClass);
3472 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3473 return JNIHandles::make_local(env, result);
3474 JVM_END
3475
3476
3477 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3478 JVMWrapper("JVM_NewMultiArray");
3479 JvmtiVMObjectAllocEventCollector oam;
3480 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3481 oop element_mirror = JNIHandles::resolve(eltClass);
3482 assert(dim_array->is_typeArray(), "just checking");
3483 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3484 return JNIHandles::make_local(env, result);
3485 JVM_END
3486
3487
3488 // Library support ///////////////////////////////////////////////////////////////////////////
3489
3490 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3491 //%note jvm_ct
3492 JVMWrapper("JVM_LoadLibrary");
3493 char ebuf[1024];
3494 void *load_result;
3495 {
3496 ThreadToNativeFromVM ttnfvm(thread);
3497 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3498 }
3499 if (load_result == NULL) {
3500 char msg[1024];
3501 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3502 // Since 'ebuf' may contain a string encoded using
3503 // platform encoding scheme, we need to pass
3504 // Exceptions::unsafe_to_utf8 to the new_exception method
3505 // as the last argument. See bug 6367357.
3506 Handle h_exception =
3507 Exceptions::new_exception(thread,
3508 vmSymbols::java_lang_UnsatisfiedLinkError(),
3509 msg, Exceptions::unsafe_to_utf8);
3510
3511 THROW_HANDLE_0(h_exception);
3512 }
3513 return load_result;
3514 JVM_END
3515
3516
3517 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3518 JVMWrapper("JVM_UnloadLibrary");
3519 os::dll_unload(handle);
3520 JVM_END
3521
3522
3523 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3524 JVMWrapper("JVM_FindLibraryEntry");
3525 return os::dll_lookup(handle, name);
3526 JVM_END
3527
3528
3529 // JNI version ///////////////////////////////////////////////////////////////////////////////
3530
3531 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3532 JVMWrapper("JVM_IsSupportedJNIVersion");
3533 return Threads::is_supported_jni_version_including_1_1(version);
3534 JVM_END
3535
3536
3537 // String support ///////////////////////////////////////////////////////////////////////////
3538
3539 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3540 JVMWrapper("JVM_InternString");
3541 JvmtiVMObjectAllocEventCollector oam;
3542 if (str == NULL) return NULL;
3543 oop string = JNIHandles::resolve_non_null(str);
3544 oop result = StringTable::intern(string, CHECK_NULL);
3545 return (jstring) JNIHandles::make_local(env, result);
3546 JVM_END
3547
3548
3549 // Raw monitor support //////////////////////////////////////////////////////////////////////
3550
3551 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3552 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3553 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3554 // that only works with java threads.
3555
3556
3557 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3558 VM_Exit::block_if_vm_exited();
3559 JVMWrapper("JVM_RawMonitorCreate");
3560 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3561 }
3562
3563
3564 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3565 VM_Exit::block_if_vm_exited();
3566 JVMWrapper("JVM_RawMonitorDestroy");
3567 delete ((Mutex*) mon);
3568 }
3569
3570
3571 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3572 VM_Exit::block_if_vm_exited();
3573 JVMWrapper("JVM_RawMonitorEnter");
3574 ((Mutex*) mon)->jvm_raw_lock();
3575 return 0;
3576 }
3577
3578
3579 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3580 VM_Exit::block_if_vm_exited();
3581 JVMWrapper("JVM_RawMonitorExit");
3582 ((Mutex*) mon)->jvm_raw_unlock();
3583 }
3584
3585
3586 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3587
3588 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3589 Handle loader, Handle protection_domain,
3590 jboolean throwError, TRAPS) {
3591 // Security Note:
3592 // The Java level wrapper will perform the necessary security check allowing
3593 // us to pass the NULL as the initiating class loader. The VM is responsible for
3594 // the checkPackageAccess relative to the initiating class loader via the
3595 // protection_domain. The protection_domain is passed as NULL by the java code
3596 // if there is no security manager in 3-arg Class.forName().
3597 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3598
3599 KlassHandle klass_handle(THREAD, klass);
3600 // Check if we should initialize the class
3601 if (init && klass_handle->is_instance_klass()) {
3602 klass_handle->initialize(CHECK_NULL);
3603 }
3604 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
3605 }
3606
3607
3608 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3609
3610 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3611 JVMWrapper("JVM_InvokeMethod");
3612 Handle method_handle;
3613 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3614 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3615 Handle receiver(THREAD, JNIHandles::resolve(obj));
3616 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3617 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3618 jobject res = JNIHandles::make_local(env, result);
3619 if (JvmtiExport::should_post_vm_object_alloc()) {
3620 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3621 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3622 if (java_lang_Class::is_primitive(ret_type)) {
3623 // Only for primitive type vm allocates memory for java object.
3624 // See box() method.
3625 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3626 }
3627 }
3628 return res;
3629 } else {
3630 THROW_0(vmSymbols::java_lang_StackOverflowError());
3631 }
3632 JVM_END
3633
3634
3635 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3636 JVMWrapper("JVM_NewInstanceFromConstructor");
3637 oop constructor_mirror = JNIHandles::resolve(c);
3638 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3639 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3640 jobject res = JNIHandles::make_local(env, result);
3641 if (JvmtiExport::should_post_vm_object_alloc()) {
3642 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3643 }
3644 return res;
3645 JVM_END
3646
3647 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3648
3649 JVM_LEAF(jboolean, JVM_SupportsCX8())
3650 JVMWrapper("JVM_SupportsCX8");
3651 return VM_Version::supports_cx8();
3652 JVM_END
3653
3654 // Returns an array of all live Thread objects (VM internal JavaThreads,
3655 // jvmti agent threads, and JNI attaching threads are skipped)
3656 // See CR 6404306 regarding JNI attaching threads
3657 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3658 ResourceMark rm(THREAD);
3659 ThreadsListEnumerator tle(THREAD, false, false);
3660 JvmtiVMObjectAllocEventCollector oam;
3661
3662 int num_threads = tle.num_threads();
3663 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3664 objArrayHandle threads_ah(THREAD, r);
3665
3666 for (int i = 0; i < num_threads; i++) {
3667 Handle h = tle.get_threadObj(i);
3668 threads_ah->obj_at_put(i, h());
3669 }
3670
3671 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3672 JVM_END
3673
3674
3675 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3676 // Return StackTraceElement[][], each element is the stack trace of a thread in
3677 // the corresponding entry in the given threads array
3678 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3679 JVMWrapper("JVM_DumpThreads");
3680 JvmtiVMObjectAllocEventCollector oam;
3681
3682 // Check if threads is null
3683 if (threads == NULL) {
3684 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3685 }
3686
3687 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3688 objArrayHandle ah(THREAD, a);
3689 int num_threads = ah->length();
3690 // check if threads is non-empty array
3691 if (num_threads == 0) {
3692 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3693 }
3694
3695 // check if threads is not an array of objects of Thread class
3696 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3697 if (k != SystemDictionary::Thread_klass()) {
3698 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3699 }
3700
3701 ResourceMark rm(THREAD);
3702
3703 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3704 for (int i = 0; i < num_threads; i++) {
3705 oop thread_obj = ah->obj_at(i);
3706 instanceHandle h(THREAD, (instanceOop) thread_obj);
3707 thread_handle_array->append(h);
3708 }
3709
3710 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3711 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3712
3713 JVM_END
3714
3715 // JVM monitoring and management support
3716 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3717 return Management::get_jmm_interface(version);
3718 JVM_END
3719
3720 // com.sun.tools.attach.VirtualMachine agent properties support
3721 //
3722 // Initialize the agent properties with the properties maintained in the VM
3723 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3724 JVMWrapper("JVM_InitAgentProperties");
3725 ResourceMark rm;
3726
3727 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3728
3729 PUTPROP(props, "sun.java.command", Arguments::java_command());
3730 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3731 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3732 return properties;
3733 JVM_END
3734
3735 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3736 {
3737 JVMWrapper("JVM_GetEnclosingMethodInfo");
3738 JvmtiVMObjectAllocEventCollector oam;
3739
3740 if (ofClass == NULL) {
3741 return NULL;
3742 }
3743 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3744 // Special handling for primitive objects
3745 if (java_lang_Class::is_primitive(mirror())) {
3746 return NULL;
3747 }
3748 Klass* k = java_lang_Class::as_Klass(mirror());
3749 if (!k->is_instance_klass()) {
3750 return NULL;
3751 }
3752 instanceKlassHandle ik_h(THREAD, k);
3753 int encl_method_class_idx = ik_h->enclosing_method_class_index();
3754 if (encl_method_class_idx == 0) {
3755 return NULL;
3756 }
3757 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3758 objArrayHandle dest(THREAD, dest_o);
3759 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3760 dest->obj_at_put(0, enc_k->java_mirror());
3761 int encl_method_method_idx = ik_h->enclosing_method_method_index();
3762 if (encl_method_method_idx != 0) {
3763 Symbol* sym = ik_h->constants()->symbol_at(
3764 extract_low_short_from_int(
3765 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3766 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3767 dest->obj_at_put(1, str());
3768 sym = ik_h->constants()->symbol_at(
3769 extract_high_short_from_int(
3770 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3771 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3772 dest->obj_at_put(2, str());
3773 }
3774 return (jobjectArray) JNIHandles::make_local(dest());
3775 }
3776 JVM_END
3777
3778 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3779 {
3780 memset(info, 0, info_size);
3781
3782 info->jvm_version = Abstract_VM_Version::jvm_version();
3783 info->patch_version = Abstract_VM_Version::vm_patch_version();
3784
3785 // when we add a new capability in the jvm_version_info struct, we should also
3786 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3787 // counter defined in runtimeService.cpp.
3788 info->is_attachable = AttachListener::is_attach_supported();
3789 }
3790 JVM_END
3791
3792 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3793 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3794 ResourceMark rm(THREAD);
3795
3796 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3797 return NULL;
3798 }
3799
3800 char** vm_flags = Arguments::jvm_flags_array();
3801 char** vm_args = Arguments::jvm_args_array();
3802 int num_flags = Arguments::num_jvm_flags();
3803 int num_args = Arguments::num_jvm_args();
3804
3805 instanceKlassHandle ik (THREAD, SystemDictionary::String_klass());
3806 objArrayOop r = oopFactory::new_objArray(ik(), num_args + num_flags, CHECK_NULL);
3807 objArrayHandle result_h(THREAD, r);
3808
3809 int index = 0;
3810 for (int j = 0; j < num_flags; j++, index++) {
3811 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3812 result_h->obj_at_put(index, h());
3813 }
3814 for (int i = 0; i < num_args; i++, index++) {
3815 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3816 result_h->obj_at_put(index, h());
3817 }
3818 return (jobjectArray) JNIHandles::make_local(env, result_h());
3819 JVM_END
3820
3821 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3822 return os::get_signal_number(name);
3823 JVM_END