1 /*
2 * Copyright (c) 1997, 2014, 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/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #if INCLUDE_CDS
32 #include "classfile/sharedClassUtil.hpp"
33 #include "classfile/systemDictionaryShared.hpp"
34 #endif
35 #include "classfile/vmSymbols.hpp"
36 #include "gc_interface/collectedHeap.inline.hpp"
37 #include "interpreter/bytecode.hpp"
38 #include "memory/oopFactory.hpp"
39 #include "memory/universe.inline.hpp"
40 #include "oops/fieldStreams.hpp"
41 #include "oops/instanceKlass.hpp"
42 #include "oops/objArrayKlass.hpp"
43 #include "oops/method.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 "runtime/arguments.hpp"
51 #include "runtime/atomic.inline.hpp"
52 #include "runtime/dtraceJSDT.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/top.hpp"
77 #include "utilities/utf8.hpp"
78 #ifdef TARGET_OS_FAMILY_linux
79 # include "jvm_linux.h"
80 #endif
81 #ifdef TARGET_OS_FAMILY_solaris
82 # include "jvm_solaris.h"
83 #endif
84 #ifdef TARGET_OS_FAMILY_windows
85 # include "jvm_windows.h"
86 #endif
87 #ifdef TARGET_OS_FAMILY_aix
88 # include "jvm_aix.h"
89 #endif
90 #ifdef TARGET_OS_FAMILY_bsd
91 # include "jvm_bsd.h"
92 #endif
93
94 #include <errno.h>
95
96 /*
97 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
98 such ctors and calls MUST NOT come between an oop declaration/init and its
99 usage because if objects are move this may cause various memory stomps, bus
100 errors and segfaults. Here is a cookbook for causing so called "naked oop
101 failures":
102
103 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
104 JVMWrapper("JVM_GetClassDeclaredFields");
105
106 // Object address to be held directly in mirror & not visible to GC
107 oop mirror = JNIHandles::resolve_non_null(ofClass);
108
109 // If this ctor can hit a safepoint, moving objects around, then
110 ComplexConstructor foo;
111
112 // Boom! mirror may point to JUNK instead of the intended object
113 (some dereference of mirror)
114
115 // Here's another call that may block for GC, making mirror stale
116 MutexLocker ml(some_lock);
117
118 // And here's an initializer that can result in a stale oop
119 // all in one step.
120 oop o = call_that_can_throw_exception(TRAPS);
121
122
123 The solution is to keep the oop declaration BELOW the ctor or function
124 call that might cause a GC, do another resolve to reassign the oop, or
125 consider use of a Handle instead of an oop so there is immunity from object
126 motion. But note that the "QUICK" entries below do not have a handlemark
127 and thus can only support use of handles passed in.
128 */
129
130 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
131 ResourceMark rm;
132 int line_number = -1;
133 const char * source_file = NULL;
134 const char * trace = "explicit";
135 InstanceKlass* caller = NULL;
136 JavaThread* jthread = JavaThread::current();
137 if (jthread->has_last_Java_frame()) {
138 vframeStream vfst(jthread);
139
140 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
141 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
142 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
143 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
144 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
145
146 Method* last_caller = NULL;
147
148 while (!vfst.at_end()) {
149 Method* m = vfst.method();
150 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
151 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
152 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
153 break;
154 }
155 last_caller = m;
156 vfst.next();
157 }
158 // if this is called from Class.forName0 and that is called from Class.forName,
159 // then print the caller of Class.forName. If this is Class.loadClass, then print
160 // that caller, otherwise keep quiet since this should be picked up elsewhere.
161 bool found_it = false;
162 if (!vfst.at_end() &&
163 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
164 vfst.method()->name() == vmSymbols::forName0_name()) {
165 vfst.next();
166 if (!vfst.at_end() &&
167 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
168 vfst.method()->name() == vmSymbols::forName_name()) {
169 vfst.next();
170 found_it = true;
171 }
172 } else if (last_caller != NULL &&
173 last_caller->method_holder()->name() ==
174 vmSymbols::java_lang_ClassLoader() &&
175 (last_caller->name() == vmSymbols::loadClassInternal_name() ||
176 last_caller->name() == vmSymbols::loadClass_name())) {
177 found_it = true;
178 } else if (!vfst.at_end()) {
179 if (vfst.method()->is_native()) {
180 // JNI call
181 found_it = true;
182 }
183 }
184 if (found_it && !vfst.at_end()) {
185 // found the caller
186 caller = vfst.method()->method_holder();
187 line_number = vfst.method()->line_number_from_bci(vfst.bci());
188 if (line_number == -1) {
189 // show method name if it's a native method
190 trace = vfst.method()->name_and_sig_as_C_string();
191 }
192 Symbol* s = caller->source_file_name();
193 if (s != NULL) {
194 source_file = s->as_C_string();
195 }
196 }
197 }
198 if (caller != NULL) {
199 if (to_class != caller) {
200 const char * from = caller->external_name();
201 const char * to = to_class->external_name();
202 // print in a single call to reduce interleaving between threads
203 if (source_file != NULL) {
204 tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace);
205 } else {
206 tty->print("RESOLVE %s %s (%s)\n", from, to, trace);
207 }
208 }
209 }
210 }
211
212 void trace_class_resolution(Klass* to_class) {
213 EXCEPTION_MARK;
214 trace_class_resolution_impl(to_class, THREAD);
215 if (HAS_PENDING_EXCEPTION) {
216 CLEAR_PENDING_EXCEPTION;
217 }
218 }
219
220 // Wrapper to trace JVM functions
221
222 #ifdef ASSERT
223 class JVMTraceWrapper : public StackObj {
224 public:
225 JVMTraceWrapper(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) {
226 if (TraceJVMCalls) {
227 va_list ap;
228 va_start(ap, format);
229 tty->print("JVM ");
230 tty->vprint_cr(format, ap);
231 va_end(ap);
232 }
233 }
234 };
235
236 Histogram* JVMHistogram;
237 volatile jint JVMHistogram_lock = 0;
238
239 class JVMHistogramElement : public HistogramElement {
240 public:
241 JVMHistogramElement(const char* name);
242 };
243
244 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
245 _name = elementName;
246 uintx count = 0;
247
248 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
249 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
250 count +=1;
251 if ( (WarnOnStalledSpinLock > 0)
252 && (count % WarnOnStalledSpinLock == 0)) {
253 warning("JVMHistogram_lock seems to be stalled");
254 }
255 }
256 }
257
258 if(JVMHistogram == NULL)
259 JVMHistogram = new Histogram("JVM Call Counts",100);
260
261 JVMHistogram->add_element(this);
262 Atomic::dec(&JVMHistogram_lock);
263 }
264
265 #define JVMCountWrapper(arg) \
266 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
267 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
268
269 #define JVMWrapper(arg1) JVMCountWrapper(arg1); JVMTraceWrapper(arg1)
270 #define JVMWrapper2(arg1, arg2) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2)
271 #define JVMWrapper3(arg1, arg2, arg3) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3)
272 #define JVMWrapper4(arg1, arg2, arg3, arg4) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3, arg4)
273 #else
274 #define JVMWrapper(arg1)
275 #define JVMWrapper2(arg1, arg2)
276 #define JVMWrapper3(arg1, arg2, arg3)
277 #define JVMWrapper4(arg1, arg2, arg3, arg4)
278 #endif
279
280
281 // Interface version /////////////////////////////////////////////////////////////////////
282
283
284 JVM_LEAF(jint, JVM_GetInterfaceVersion())
285 return JVM_INTERFACE_VERSION;
286 JVM_END
287
288
289 // java.lang.System //////////////////////////////////////////////////////////////////////
290
291
292 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
293 JVMWrapper("JVM_CurrentTimeMillis");
294 return os::javaTimeMillis();
295 JVM_END
296
297 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
298 JVMWrapper("JVM_NanoTime");
299 return os::javaTimeNanos();
300 JVM_END
301
302
303 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
304 jobject dst, jint dst_pos, jint length))
305 JVMWrapper("JVM_ArrayCopy");
306 // Check if we have null pointers
307 if (src == NULL || dst == NULL) {
308 THROW(vmSymbols::java_lang_NullPointerException());
309 }
310 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
311 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
312 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop");
313 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop");
314 // Do copy
315 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
316 JVM_END
317
318
319 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
320 JavaValue r(T_OBJECT);
321 // public synchronized Object put(Object key, Object value);
322 HandleMark hm(THREAD);
323 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
324 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
325 JavaCalls::call_virtual(&r,
326 props,
327 KlassHandle(THREAD, SystemDictionary::Properties_klass()),
328 vmSymbols::put_name(),
329 vmSymbols::object_object_object_signature(),
330 key_str,
331 value_str,
332 THREAD);
333 }
334
335
336 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
337
338
339 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
340 JVMWrapper("JVM_InitProperties");
341 ResourceMark rm;
342
343 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
344
345 // System property list includes both user set via -D option and
346 // jvm system specific properties.
347 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
348 PUTPROP(props, p->key(), p->value());
349 }
350
351 // Convert the -XX:MaxDirectMemorySize= command line flag
352 // to the sun.nio.MaxDirectMemorySize property.
353 // Do this after setting user properties to prevent people
354 // from setting the value with a -D option, as requested.
355 {
356 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
357 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
358 } else {
359 char as_chars[256];
360 jio_snprintf(as_chars, sizeof(as_chars), UINTX_FORMAT, MaxDirectMemorySize);
361 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
362 }
363 }
364
365 // JVM monitoring and management support
366 // Add the sun.management.compiler property for the compiler's name
367 {
368 #undef CSIZE
369 #if defined(_LP64) || defined(_WIN64)
370 #define CSIZE "64-Bit "
371 #else
372 #define CSIZE
373 #endif // 64bit
374
375 #ifdef TIERED
376 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
377 #else
378 #if defined(COMPILER1)
379 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
380 #elif defined(COMPILER2)
381 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
382 #else
383 const char* compiler_name = "";
384 #endif // compilers
385 #endif // TIERED
386
387 if (*compiler_name != '\0' &&
388 (Arguments::mode() != Arguments::_int)) {
389 PUTPROP(props, "sun.management.compiler", compiler_name);
390 }
391 }
392
393 return properties;
394 JVM_END
395
396
397 /*
398 * Return the temporary directory that the VM uses for the attach
399 * and perf data files.
400 *
401 * It is important that this directory is well-known and the
402 * same for all VM instances. It cannot be affected by configuration
403 * variables such as java.io.tmpdir.
404 */
405 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
406 JVMWrapper("JVM_GetTemporaryDirectory");
407 HandleMark hm(THREAD);
408 const char* temp_dir = os::get_temp_directory();
409 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
410 return (jstring) JNIHandles::make_local(env, h());
411 JVM_END
412
413
414 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
415
416 extern volatile jint vm_created;
417
418 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
419 before_exit(thread);
420 vm_exit(code);
421 JVM_END
422
423
424 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
425 JVMWrapper("JVM_GC");
426 if (!DisableExplicitGC) {
427 Universe::heap()->collect(GCCause::_java_lang_system_gc);
428 }
429 JVM_END
430
431
432 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
433 JVMWrapper("JVM_MaxObjectInspectionAge");
434 return Universe::heap()->millis_since_last_gc();
435 JVM_END
436
437
438 static inline jlong convert_size_t_to_jlong(size_t val) {
439 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
440 NOT_LP64 (return (jlong)val;)
441 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
442 }
443
444 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
445 JVMWrapper("JVM_TotalMemory");
446 size_t n = Universe::heap()->capacity();
447 return convert_size_t_to_jlong(n);
448 JVM_END
449
450
451 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
452 JVMWrapper("JVM_FreeMemory");
453 CollectedHeap* ch = Universe::heap();
454 size_t n;
455 {
456 MutexLocker x(Heap_lock);
457 n = ch->capacity() - ch->used();
458 }
459 return convert_size_t_to_jlong(n);
460 JVM_END
461
462
463 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
464 JVMWrapper("JVM_MaxMemory");
465 size_t n = Universe::heap()->max_capacity();
466 return convert_size_t_to_jlong(n);
467 JVM_END
468
469
470 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
471 JVMWrapper("JVM_ActiveProcessorCount");
472 return os::active_processor_count();
473 JVM_END
474
475
476
477 // java.lang.Throwable //////////////////////////////////////////////////////
478
479
480 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
481 JVMWrapper("JVM_FillInStackTrace");
482 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
483 java_lang_Throwable::fill_in_stack_trace(exception);
484 JVM_END
485
486
487 JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable))
488 JVMWrapper("JVM_GetStackTraceDepth");
489 oop exception = JNIHandles::resolve(throwable);
490 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD);
491 JVM_END
492
493
494 JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index))
495 JVMWrapper("JVM_GetStackTraceElement");
496 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC
497 oop exception = JNIHandles::resolve(throwable);
498 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL);
499 return JNIHandles::make_local(env, element);
500 JVM_END
501
502
503 // java.lang.Object ///////////////////////////////////////////////
504
505
506 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
507 JVMWrapper("JVM_IHashCode");
508 // as implemented in the classic virtual machine; return 0 if object is NULL
509 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
510 JVM_END
511
512
513 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
514 JVMWrapper("JVM_MonitorWait");
515 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
516 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
517 if (JvmtiExport::should_post_monitor_wait()) {
518 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
519
520 // The current thread already owns the monitor and it has not yet
521 // been added to the wait queue so the current thread cannot be
522 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
523 // event handler cannot accidentally consume an unpark() meant for
524 // the ParkEvent associated with this ObjectMonitor.
525 }
526 ObjectSynchronizer::wait(obj, ms, CHECK);
527 JVM_END
528
529
530 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
531 JVMWrapper("JVM_MonitorNotify");
532 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
533 ObjectSynchronizer::notify(obj, CHECK);
534 JVM_END
535
536
537 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
538 JVMWrapper("JVM_MonitorNotifyAll");
539 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
540 ObjectSynchronizer::notifyall(obj, CHECK);
541 JVM_END
542
543
544 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
545 JVMWrapper("JVM_Clone");
546 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
547 const KlassHandle klass (THREAD, obj->klass());
548 JvmtiVMObjectAllocEventCollector oam;
549
550 #ifdef ASSERT
551 // Just checking that the cloneable flag is set correct
552 if (obj->is_array()) {
553 guarantee(klass->is_cloneable(), "all arrays are cloneable");
554 } else {
555 guarantee(obj->is_instance(), "should be instanceOop");
556 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
557 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
558 }
559 #endif
560
561 // Check if class of obj supports the Cloneable interface.
562 // All arrays are considered to be cloneable (See JLS 20.1.5)
563 if (!klass->is_cloneable()) {
564 ResourceMark rm(THREAD);
565 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
566 }
567
568 // Make shallow object copy
569 const int size = obj->size();
570 oop new_obj = NULL;
571 if (obj->is_array()) {
572 const int length = ((arrayOop)obj())->length();
573 new_obj = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
574 } else {
575 new_obj = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
576 }
577 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
578 // is modifying a reference field in the clonee, a non-oop-atomic copy might
579 // be suspended in the middle of copying the pointer and end up with parts
580 // of two different pointers in the field. Subsequent dereferences will crash.
581 // 4846409: an oop-copy of objects with long or double fields or arrays of same
582 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
583 // of oops. We know objects are aligned on a minimum of an jlong boundary.
584 // The same is true of StubRoutines::object_copy and the various oop_copy
585 // variants, and of the code generated by the inline_native_clone intrinsic.
586 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
587 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj,
588 (size_t)align_object_size(size) / HeapWordsPerLong);
589 // Clear the header
590 new_obj->init_mark();
591
592 // Store check (mark entire object and let gc sort it out)
593 BarrierSet* bs = Universe::heap()->barrier_set();
594 assert(bs->has_write_region_opt(), "Barrier set does not have write_region");
595 bs->write_region(MemRegion((HeapWord*)new_obj, size));
596
597 // Caution: this involves a java upcall, so the clone should be
598 // "gc-robust" by this stage.
599 if (klass->has_finalizer()) {
600 assert(obj->is_instance(), "should be instanceOop");
601 new_obj = InstanceKlass::register_finalizer(instanceOop(new_obj), CHECK_NULL);
602 }
603
604 return JNIHandles::make_local(env, oop(new_obj));
605 JVM_END
606
607 // java.io.File ///////////////////////////////////////////////////////////////
608
609 JVM_LEAF(char*, JVM_NativePath(char* path))
610 JVMWrapper2("JVM_NativePath (%s)", path);
611 return os::native_path(path);
612 JVM_END
613
614
615 // Misc. class handling ///////////////////////////////////////////////////////////
616
617
618 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
619 JVMWrapper("JVM_GetCallerClass");
620
621 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
622 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
623 // temporarily for existing code to use until a replacement API is defined.
624 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
625 Klass* k = thread->security_get_caller_class(depth);
626 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
627 }
628
629 // Getting the class of the caller frame.
630 //
631 // The call stack at this point looks something like this:
632 //
633 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
634 // [1] [ @CallerSensitive API.method ]
635 // [.] [ (skipped intermediate frames) ]
636 // [n] [ caller ]
637 vframeStream vfst(thread);
638 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
639 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
640 Method* m = vfst.method();
641 assert(m != NULL, "sanity");
642 switch (n) {
643 case 0:
644 // This must only be called from Reflection.getCallerClass
645 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
646 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
647 }
648 // fall-through
649 case 1:
650 // Frame 0 and 1 must be caller sensitive.
651 if (!m->caller_sensitive()) {
652 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
653 }
654 break;
655 default:
656 if (!m->is_ignored_by_security_stack_walk()) {
657 // We have reached the desired frame; return the holder class.
658 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
659 }
660 break;
661 }
662 }
663 return NULL;
664 JVM_END
665
666
667 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
668 JVMWrapper("JVM_FindPrimitiveClass");
669 oop mirror = NULL;
670 BasicType t = name2type(utf);
671 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
672 mirror = Universe::java_mirror(t);
673 }
674 if (mirror == NULL) {
675 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
676 } else {
677 return (jclass) JNIHandles::make_local(env, mirror);
678 }
679 JVM_END
680
681
682 // Returns a class loaded by the bootstrap class loader; or null
683 // if not found. ClassNotFoundException is not thrown.
684 //
685 // Rationale behind JVM_FindClassFromBootLoader
686 // a> JVM_FindClassFromClassLoader was never exported in the export tables.
687 // b> because of (a) java.dll has a direct dependecy on the unexported
688 // private symbol "_JVM_FindClassFromClassLoader@20".
689 // c> the launcher cannot use the private symbol as it dynamically opens
690 // the entry point, so if something changes, the launcher will fail
691 // unexpectedly at runtime, it is safest for the launcher to dlopen a
692 // stable exported interface.
693 // d> re-exporting JVM_FindClassFromClassLoader as public, will cause its
694 // signature to change from _JVM_FindClassFromClassLoader@20 to
695 // JVM_FindClassFromClassLoader and will not be backward compatible
696 // with older JDKs.
697 // Thus a public/stable exported entry point is the right solution,
698 // public here means public in linker semantics, and is exported only
699 // to the JDK, and is not intended to be a public API.
700
701 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
702 const char* name))
703 JVMWrapper2("JVM_FindClassFromBootLoader %s", name);
704
705 // Java libraries should ensure that name is never null...
706 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
707 // It's impossible to create this class; the name cannot fit
708 // into the constant pool.
709 return NULL;
710 }
711
712 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
713 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
714 if (k == NULL) {
715 return NULL;
716 }
717
718 if (TraceClassResolution) {
719 trace_class_resolution(k);
720 }
721 return (jclass) JNIHandles::make_local(env, k->java_mirror());
722 JVM_END
723
724 JVM_ENTRY(jclass, JVM_FindClassFromClassLoader(JNIEnv* env, const char* name,
725 jboolean init, jobject loader,
726 jboolean throwError))
727 JVMWrapper3("JVM_FindClassFromClassLoader %s throw %s", name,
728 throwError ? "error" : "exception");
729 // Java libraries should ensure that name is never null...
730 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
731 // It's impossible to create this class; the name cannot fit
732 // into the constant pool.
733 if (throwError) {
734 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
735 } else {
736 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
737 }
738 }
739 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
740 Handle h_loader(THREAD, JNIHandles::resolve(loader));
741 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
742 Handle(), throwError, THREAD);
743
744 if (TraceClassResolution && result != NULL) {
745 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
746 }
747 return result;
748 JVM_END
749
750
751 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
752 jboolean init, jclass from))
753 JVMWrapper2("JVM_FindClassFromClass %s", name);
754 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
755 // It's impossible to create this class; the name cannot fit
756 // into the constant pool.
757 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
758 }
759 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
760 oop from_class_oop = JNIHandles::resolve(from);
761 Klass* from_class = (from_class_oop == NULL)
762 ? (Klass*)NULL
763 : java_lang_Class::as_Klass(from_class_oop);
764 oop class_loader = NULL;
765 oop protection_domain = NULL;
766 if (from_class != NULL) {
767 class_loader = from_class->class_loader();
768 protection_domain = from_class->protection_domain();
769 }
770 Handle h_loader(THREAD, class_loader);
771 Handle h_prot (THREAD, protection_domain);
772 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
773 h_prot, true, thread);
774
775 if (TraceClassResolution && result != NULL) {
776 // this function is generally only used for class loading during verification.
777 ResourceMark rm;
778 oop from_mirror = JNIHandles::resolve_non_null(from);
779 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
780 const char * from_name = from_class->external_name();
781
782 oop mirror = JNIHandles::resolve_non_null(result);
783 Klass* to_class = java_lang_Class::as_Klass(mirror);
784 const char * to = to_class->external_name();
785 tty->print("RESOLVE %s %s (verification)\n", from_name, to);
786 }
787
788 return result;
789 JVM_END
790
791 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
792 if (loader.is_null()) {
793 return;
794 }
795
796 // check whether the current caller thread holds the lock or not.
797 // If not, increment the corresponding counter
798 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
799 ObjectSynchronizer::owner_self) {
800 counter->inc();
801 }
802 }
803
804 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
805 // and JVM_DefineClassWithSourceCond()
806 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
807 jobject loader, const jbyte *buf,
808 jsize len, jobject pd, const char *source,
809 jboolean verify, TRAPS) {
810 if (source == NULL) source = "__JVM_DefineClass__";
811
812 assert(THREAD->is_Java_thread(), "must be a JavaThread");
813 JavaThread* jt = (JavaThread*) THREAD;
814
815 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
816 ClassLoader::perf_define_appclass_selftime(),
817 ClassLoader::perf_define_appclasses(),
818 jt->get_thread_stat()->perf_recursion_counts_addr(),
819 jt->get_thread_stat()->perf_timers_addr(),
820 PerfClassTraceTime::DEFINE_CLASS);
821
822 if (UsePerfData) {
823 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
824 }
825
826 // Since exceptions can be thrown, class initialization can take place
827 // if name is NULL no check for class name in .class stream has to be made.
828 TempNewSymbol class_name = NULL;
829 if (name != NULL) {
830 const int str_len = (int)strlen(name);
831 if (str_len > Symbol::max_length()) {
832 // It's impossible to create this class; the name cannot fit
833 // into the constant pool.
834 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
835 }
836 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
837 }
838
839 ResourceMark rm(THREAD);
840 ClassFileStream st((u1*) buf, len, (char *)source);
841 Handle class_loader (THREAD, JNIHandles::resolve(loader));
842 if (UsePerfData) {
843 is_lock_held_by_thread(class_loader,
844 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
845 THREAD);
846 }
847 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
848 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader,
849 protection_domain, &st,
850 verify != 0,
851 CHECK_NULL);
852
853 if (TraceClassResolution && k != NULL) {
854 trace_class_resolution(k);
855 }
856
857 return (jclass) JNIHandles::make_local(env, k->java_mirror());
858 }
859
860
861 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
862 JVMWrapper2("JVM_DefineClass %s", name);
863
864 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD);
865 JVM_END
866
867
868 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
869 JVMWrapper2("JVM_DefineClassWithSource %s", name);
870
871 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD);
872 JVM_END
873
874 JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name,
875 jobject loader, const jbyte *buf,
876 jsize len, jobject pd,
877 const char *source, jboolean verify))
878 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name);
879
880 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD);
881 JVM_END
882
883 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
884 JVMWrapper("JVM_FindLoadedClass");
885 ResourceMark rm(THREAD);
886
887 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
888 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
889
890 const char* str = java_lang_String::as_utf8_string(string());
891 // Sanity check, don't expect null
892 if (str == NULL) return NULL;
893
894 const int str_len = (int)strlen(str);
895 if (str_len > Symbol::max_length()) {
896 // It's impossible to create this class; the name cannot fit
897 // into the constant pool.
898 return NULL;
899 }
900 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
901
902 // Security Note:
903 // The Java level wrapper will perform the necessary security check allowing
904 // us to pass the NULL as the initiating class loader.
905 Handle h_loader(THREAD, JNIHandles::resolve(loader));
906 if (UsePerfData) {
907 is_lock_held_by_thread(h_loader,
908 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
909 THREAD);
910 }
911
912 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
913 h_loader,
914 Handle(),
915 CHECK_NULL);
916 #if INCLUDE_CDS
917 if (k == NULL) {
918 // If the class is not already loaded, try to see if it's in the shared
919 // archive for the current classloader (h_loader).
920 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
921 klass_name, h_loader, CHECK_NULL);
922 k = ik();
923 }
924 #endif
925 return (k == NULL) ? NULL :
926 (jclass) JNIHandles::make_local(env, k->java_mirror());
927 JVM_END
928
929
930 // Reflection support //////////////////////////////////////////////////////////////////////////////
931
932 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
933 assert (cls != NULL, "illegal class");
934 JVMWrapper("JVM_GetClassName");
935 JvmtiVMObjectAllocEventCollector oam;
936 ResourceMark rm(THREAD);
937 const char* name;
938 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
939 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
940 } else {
941 // Consider caching interned string in Klass
942 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
943 assert(k->is_klass(), "just checking");
944 name = k->external_name();
945 }
946 oop result = StringTable::intern((char*) name, CHECK_NULL);
947 return (jstring) JNIHandles::make_local(env, result);
948 JVM_END
949
950
951 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
952 JVMWrapper("JVM_GetClassInterfaces");
953 JvmtiVMObjectAllocEventCollector oam;
954 oop mirror = JNIHandles::resolve_non_null(cls);
955
956 // Special handling for primitive objects
957 if (java_lang_Class::is_primitive(mirror)) {
958 // Primitive objects does not have any interfaces
959 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
960 return (jobjectArray) JNIHandles::make_local(env, r);
961 }
962
963 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
964 // Figure size of result array
965 int size;
966 if (klass->oop_is_instance()) {
967 size = InstanceKlass::cast(klass())->local_interfaces()->length();
968 } else {
969 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass");
970 size = 2;
971 }
972
973 // Allocate result array
974 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
975 objArrayHandle result (THREAD, r);
976 // Fill in result
977 if (klass->oop_is_instance()) {
978 // Regular instance klass, fill in all local interfaces
979 for (int index = 0; index < size; index++) {
980 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
981 result->obj_at_put(index, k->java_mirror());
982 }
983 } else {
984 // All arrays implement java.lang.Cloneable and java.io.Serializable
985 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
986 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
987 }
988 return (jobjectArray) JNIHandles::make_local(env, result());
989 JVM_END
990
991
992 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
993 JVMWrapper("JVM_IsInterface");
994 oop mirror = JNIHandles::resolve_non_null(cls);
995 if (java_lang_Class::is_primitive(mirror)) {
996 return JNI_FALSE;
997 }
998 Klass* k = java_lang_Class::as_Klass(mirror);
999 jboolean result = k->is_interface();
1000 assert(!result || k->oop_is_instance(),
1001 "all interfaces are instance types");
1002 // The compiler intrinsic for isInterface tests the
1003 // Klass::_access_flags bits in the same way.
1004 return result;
1005 JVM_END
1006
1007
1008 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1009 JVMWrapper("JVM_GetClassSigners");
1010 JvmtiVMObjectAllocEventCollector oam;
1011 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1012 // There are no signers for primitive types
1013 return NULL;
1014 }
1015
1016 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1017
1018 // If there are no signers set in the class, or if the class
1019 // is an array, return NULL.
1020 if (signers == NULL) return NULL;
1021
1022 // copy of the signers array
1023 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1024 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1025 for (int index = 0; index < signers->length(); index++) {
1026 signers_copy->obj_at_put(index, signers->obj_at(index));
1027 }
1028
1029 // return the copy
1030 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1031 JVM_END
1032
1033
1034 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1035 JVMWrapper("JVM_SetClassSigners");
1036 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1037 // This call is ignored for primitive types and arrays.
1038 // Signers are only set once, ClassLoader.java, and thus shouldn't
1039 // be called with an array. Only the bootstrap loader creates arrays.
1040 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1041 if (k->oop_is_instance()) {
1042 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1043 }
1044 }
1045 JVM_END
1046
1047
1048 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1049 JVMWrapper("JVM_GetProtectionDomain");
1050 if (JNIHandles::resolve(cls) == NULL) {
1051 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1052 }
1053
1054 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1055 // Primitive types does not have a protection domain.
1056 return NULL;
1057 }
1058
1059 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1060 return (jobject) JNIHandles::make_local(env, pd);
1061 JVM_END
1062
1063
1064 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1065 // If there is a security manager and protection domain, check the access
1066 // in the protection domain, otherwise it is authorized.
1067 if (java_lang_System::has_security_manager()) {
1068
1069 // For bootstrapping, if pd implies method isn't in the JDK, allow
1070 // this context to revert to older behavior.
1071 // In this case the isAuthorized field in AccessControlContext is also not
1072 // present.
1073 if (Universe::protection_domain_implies_method() == NULL) {
1074 return true;
1075 }
1076
1077 // Whitelist certain access control contexts
1078 if (java_security_AccessControlContext::is_authorized(context)) {
1079 return true;
1080 }
1081
1082 oop prot = klass->protection_domain();
1083 if (prot != NULL) {
1084 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1085 // in the new wrapper.
1086 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1087 Handle h_prot(THREAD, prot);
1088 JavaValue result(T_BOOLEAN);
1089 JavaCallArguments args(h_prot);
1090 JavaCalls::call(&result, m, &args, CHECK_false);
1091 return (result.get_jboolean() != 0);
1092 }
1093 }
1094 return true;
1095 }
1096
1097 // Create an AccessControlContext with a protection domain with null codesource
1098 // and null permissions - which gives no permissions.
1099 oop create_dummy_access_control_context(TRAPS) {
1100 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass());
1101 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1102 // Call constructor ProtectionDomain(null, null);
1103 JavaValue result(T_VOID);
1104 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1105 vmSymbols::object_initializer_name(),
1106 vmSymbols::codesource_permissioncollection_signature(),
1107 Handle(), Handle(), CHECK_NULL);
1108
1109 // new ProtectionDomain[] {pd};
1110 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1111 context->obj_at_put(0, obj());
1112
1113 // new AccessControlContext(new ProtectionDomain[] {pd})
1114 objArrayHandle h_context(THREAD, context);
1115 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1116 return acc;
1117 }
1118
1119 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1120 JVMWrapper("JVM_DoPrivileged");
1121
1122 if (action == NULL) {
1123 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1124 }
1125
1126 // Compute the frame initiating the do privileged operation and setup the privileged stack
1127 vframeStream vfst(thread);
1128 vfst.security_get_caller_frame(1);
1129
1130 if (vfst.at_end()) {
1131 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1132 }
1133
1134 Method* method = vfst.method();
1135 instanceKlassHandle klass (THREAD, method->method_holder());
1136
1137 // Check that action object understands "Object run()"
1138 Handle h_context;
1139 if (context != NULL) {
1140 h_context = Handle(THREAD, JNIHandles::resolve(context));
1141 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1142 if (!authorized) {
1143 // Create an unprivileged access control object and call it's run function
1144 // instead.
1145 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1146 h_context = Handle(THREAD, noprivs);
1147 }
1148 }
1149
1150 // Check that action object understands "Object run()"
1151 Handle object (THREAD, JNIHandles::resolve(action));
1152
1153 // get run() method
1154 Method* m_oop = object->klass()->uncached_lookup_method(
1155 vmSymbols::run_method_name(),
1156 vmSymbols::void_object_signature(),
1157 Klass::normal);
1158 methodHandle m (THREAD, m_oop);
1159 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1160 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1161 }
1162
1163 // Stack allocated list of privileged stack elements
1164 PrivilegedElement pi;
1165 if (!vfst.at_end()) {
1166 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1167 thread->set_privileged_stack_top(&pi);
1168 }
1169
1170
1171 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1172 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1173 Handle pending_exception;
1174 JavaValue result(T_OBJECT);
1175 JavaCallArguments args(object);
1176 JavaCalls::call(&result, m, &args, THREAD);
1177
1178 // done with action, remove ourselves from the list
1179 if (!vfst.at_end()) {
1180 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1181 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1182 }
1183
1184 if (HAS_PENDING_EXCEPTION) {
1185 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1186 CLEAR_PENDING_EXCEPTION;
1187 // JVMTI has already reported the pending exception
1188 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1189 if (THREAD->is_Java_thread()) {
1190 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1191 }
1192 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1193 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1194 // Throw a java.security.PrivilegedActionException(Exception e) exception
1195 JavaCallArguments args(pending_exception);
1196 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1197 vmSymbols::exception_void_signature(),
1198 &args);
1199 }
1200 }
1201
1202 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1203 return JNIHandles::make_local(env, (oop) result.get_jobject());
1204 JVM_END
1205
1206
1207 // Returns the inherited_access_control_context field of the running thread.
1208 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1209 JVMWrapper("JVM_GetInheritedAccessControlContext");
1210 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1211 return JNIHandles::make_local(env, result);
1212 JVM_END
1213
1214 class RegisterArrayForGC {
1215 private:
1216 JavaThread *_thread;
1217 public:
1218 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1219 _thread = thread;
1220 _thread->register_array_for_gc(array);
1221 }
1222
1223 ~RegisterArrayForGC() {
1224 _thread->register_array_for_gc(NULL);
1225 }
1226 };
1227
1228
1229 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1230 JVMWrapper("JVM_GetStackAccessControlContext");
1231 if (!UsePrivilegedStack) return NULL;
1232
1233 ResourceMark rm(THREAD);
1234 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1235 JvmtiVMObjectAllocEventCollector oam;
1236
1237 // count the protection domains on the execution stack. We collapse
1238 // duplicate consecutive protection domains into a single one, as
1239 // well as stopping when we hit a privileged frame.
1240
1241 // Use vframeStream to iterate through Java frames
1242 vframeStream vfst(thread);
1243
1244 oop previous_protection_domain = NULL;
1245 Handle privileged_context(thread, NULL);
1246 bool is_privileged = false;
1247 oop protection_domain = NULL;
1248
1249 for(; !vfst.at_end(); vfst.next()) {
1250 // get method of frame
1251 Method* method = vfst.method();
1252 intptr_t* frame_id = vfst.frame_id();
1253
1254 // check the privileged frames to see if we have a match
1255 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1256 // this frame is privileged
1257 is_privileged = true;
1258 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1259 protection_domain = thread->privileged_stack_top()->protection_domain();
1260 } else {
1261 protection_domain = method->method_holder()->protection_domain();
1262 }
1263
1264 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1265 local_array->push(protection_domain);
1266 previous_protection_domain = protection_domain;
1267 }
1268
1269 if (is_privileged) break;
1270 }
1271
1272
1273 // either all the domains on the stack were system domains, or
1274 // we had a privileged system domain
1275 if (local_array->is_empty()) {
1276 if (is_privileged && privileged_context.is_null()) return NULL;
1277
1278 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1279 return JNIHandles::make_local(env, result);
1280 }
1281
1282 // the resource area must be registered in case of a gc
1283 RegisterArrayForGC ragc(thread, local_array);
1284 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1285 local_array->length(), CHECK_NULL);
1286 objArrayHandle h_context(thread, context);
1287 for (int index = 0; index < local_array->length(); index++) {
1288 h_context->obj_at_put(index, local_array->at(index));
1289 }
1290
1291 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1292
1293 return JNIHandles::make_local(env, result);
1294 JVM_END
1295
1296
1297 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1298 JVMWrapper("JVM_IsArrayClass");
1299 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1300 return (k != NULL) && k->oop_is_array() ? true : false;
1301 JVM_END
1302
1303
1304 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1305 JVMWrapper("JVM_IsPrimitiveClass");
1306 oop mirror = JNIHandles::resolve_non_null(cls);
1307 return (jboolean) java_lang_Class::is_primitive(mirror);
1308 JVM_END
1309
1310
1311 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1312 JVMWrapper("JVM_GetClassModifiers");
1313 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1314 // Primitive type
1315 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1316 }
1317
1318 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1319 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1320 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1321 return k->modifier_flags();
1322 JVM_END
1323
1324
1325 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1326
1327 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1328 JvmtiVMObjectAllocEventCollector oam;
1329 // ofClass is a reference to a java_lang_Class object. The mirror object
1330 // of an InstanceKlass
1331
1332 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1333 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1334 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1335 return (jobjectArray)JNIHandles::make_local(env, result);
1336 }
1337
1338 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1339 InnerClassesIterator iter(k);
1340
1341 if (iter.length() == 0) {
1342 // Neither an inner nor outer class
1343 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1344 return (jobjectArray)JNIHandles::make_local(env, result);
1345 }
1346
1347 // find inner class info
1348 constantPoolHandle cp(thread, k->constants());
1349 int length = iter.length();
1350
1351 // Allocate temp. result array
1352 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1353 objArrayHandle result (THREAD, r);
1354 int members = 0;
1355
1356 for (; !iter.done(); iter.next()) {
1357 int ioff = iter.inner_class_info_index();
1358 int ooff = iter.outer_class_info_index();
1359
1360 if (ioff != 0 && ooff != 0) {
1361 // Check to see if the name matches the class we're looking for
1362 // before attempting to find the class.
1363 if (cp->klass_name_at_matches(k, ooff)) {
1364 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1365 if (outer_klass == k()) {
1366 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1367 instanceKlassHandle inner_klass (THREAD, ik);
1368
1369 // Throws an exception if outer klass has not declared k as
1370 // an inner klass
1371 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1372
1373 result->obj_at_put(members, inner_klass->java_mirror());
1374 members++;
1375 }
1376 }
1377 }
1378 }
1379
1380 if (members != length) {
1381 // Return array of right length
1382 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1383 for(int i = 0; i < members; i++) {
1384 res->obj_at_put(i, result->obj_at(i));
1385 }
1386 return (jobjectArray)JNIHandles::make_local(env, res);
1387 }
1388
1389 return (jobjectArray)JNIHandles::make_local(env, result());
1390 JVM_END
1391
1392
1393 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1394 {
1395 // ofClass is a reference to a java_lang_Class object.
1396 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1397 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1398 return NULL;
1399 }
1400
1401 bool inner_is_member = false;
1402 Klass* outer_klass
1403 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1404 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1405 if (outer_klass == NULL) return NULL; // already a top-level class
1406 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1407 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1408 }
1409 JVM_END
1410
1411 // should be in InstanceKlass.cpp, but is here for historical reasons
1412 Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle k,
1413 bool* inner_is_member,
1414 TRAPS) {
1415 Thread* thread = THREAD;
1416 InnerClassesIterator iter(k);
1417 if (iter.length() == 0) {
1418 // No inner class info => no declaring class
1419 return NULL;
1420 }
1421
1422 constantPoolHandle i_cp(thread, k->constants());
1423
1424 bool found = false;
1425 Klass* ok;
1426 instanceKlassHandle outer_klass;
1427 *inner_is_member = false;
1428
1429 // Find inner_klass attribute
1430 for (; !iter.done() && !found; iter.next()) {
1431 int ioff = iter.inner_class_info_index();
1432 int ooff = iter.outer_class_info_index();
1433 int noff = iter.inner_name_index();
1434 if (ioff != 0) {
1435 // Check to see if the name matches the class we're looking for
1436 // before attempting to find the class.
1437 if (i_cp->klass_name_at_matches(k, ioff)) {
1438 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_NULL);
1439 found = (k() == inner_klass);
1440 if (found && ooff != 0) {
1441 ok = i_cp->klass_at(ooff, CHECK_NULL);
1442 outer_klass = instanceKlassHandle(thread, ok);
1443 *inner_is_member = true;
1444 }
1445 }
1446 }
1447 }
1448
1449 if (found && outer_klass.is_null()) {
1450 // It may be anonymous; try for that.
1451 int encl_method_class_idx = k->enclosing_method_class_index();
1452 if (encl_method_class_idx != 0) {
1453 ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
1454 outer_klass = instanceKlassHandle(thread, ok);
1455 *inner_is_member = false;
1456 }
1457 }
1458
1459 // If no inner class attribute found for this class.
1460 if (outer_klass.is_null()) return NULL;
1461
1462 // Throws an exception if outer klass has not declared k as an inner klass
1463 // We need evidence that each klass knows about the other, or else
1464 // the system could allow a spoof of an inner class to gain access rights.
1465 Reflection::check_for_inner_class(outer_klass, k, *inner_is_member, CHECK_NULL);
1466 return outer_klass();
1467 }
1468
1469 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1470 assert (cls != NULL, "illegal class");
1471 JVMWrapper("JVM_GetClassSignature");
1472 JvmtiVMObjectAllocEventCollector oam;
1473 ResourceMark rm(THREAD);
1474 // Return null for arrays and primatives
1475 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1476 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1477 if (k->oop_is_instance()) {
1478 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1479 if (sym == NULL) return NULL;
1480 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1481 return (jstring) JNIHandles::make_local(env, str());
1482 }
1483 }
1484 return NULL;
1485 JVM_END
1486
1487
1488 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1489 assert (cls != NULL, "illegal class");
1490 JVMWrapper("JVM_GetClassAnnotations");
1491
1492 // Return null for arrays and primitives
1493 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1494 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1495 if (k->oop_is_instance()) {
1496 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1497 return (jbyteArray) JNIHandles::make_local(env, a);
1498 }
1499 }
1500 return NULL;
1501 JVM_END
1502
1503
1504 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1505 // some of this code was adapted from from jni_FromReflectedField
1506
1507 oop reflected = JNIHandles::resolve_non_null(field);
1508 oop mirror = java_lang_reflect_Field::clazz(reflected);
1509 Klass* k = java_lang_Class::as_Klass(mirror);
1510 int slot = java_lang_reflect_Field::slot(reflected);
1511 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1512
1513 KlassHandle kh(THREAD, k);
1514 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1515
1516 if (modifiers & JVM_ACC_STATIC) {
1517 // for static fields we only look in the current class
1518 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1519 assert(false, "cannot find static field");
1520 return false;
1521 }
1522 } else {
1523 // for instance fields we start with the current class and work
1524 // our way up through the superclass chain
1525 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1526 assert(false, "cannot find instance field");
1527 return false;
1528 }
1529 }
1530 return true;
1531 }
1532
1533 static Method* jvm_get_method_common(jobject method) {
1534 // some of this code was adapted from from jni_FromReflectedMethod
1535
1536 oop reflected = JNIHandles::resolve_non_null(method);
1537 oop mirror = NULL;
1538 int slot = 0;
1539
1540 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1541 mirror = java_lang_reflect_Constructor::clazz(reflected);
1542 slot = java_lang_reflect_Constructor::slot(reflected);
1543 } else {
1544 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1545 "wrong type");
1546 mirror = java_lang_reflect_Method::clazz(reflected);
1547 slot = java_lang_reflect_Method::slot(reflected);
1548 }
1549 Klass* k = java_lang_Class::as_Klass(mirror);
1550
1551 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1552 assert(m != NULL, "cannot find method");
1553 return m; // caller has to deal with NULL in product mode
1554 }
1555
1556 /* Type use annotations support (JDK 1.8) */
1557
1558 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1559 assert (cls != NULL, "illegal class");
1560 JVMWrapper("JVM_GetClassTypeAnnotations");
1561 ResourceMark rm(THREAD);
1562 // Return null for arrays and primitives
1563 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1564 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1565 if (k->oop_is_instance()) {
1566 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1567 if (type_annotations != NULL) {
1568 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1569 return (jbyteArray) JNIHandles::make_local(env, a);
1570 }
1571 }
1572 }
1573 return NULL;
1574 JVM_END
1575
1576 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1577 assert (method != NULL, "illegal method");
1578 JVMWrapper("JVM_GetMethodTypeAnnotations");
1579
1580 // method is a handle to a java.lang.reflect.Method object
1581 Method* m = jvm_get_method_common(method);
1582 if (m == NULL) {
1583 return NULL;
1584 }
1585
1586 AnnotationArray* type_annotations = m->type_annotations();
1587 if (type_annotations != NULL) {
1588 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1589 return (jbyteArray) JNIHandles::make_local(env, a);
1590 }
1591
1592 return NULL;
1593 JVM_END
1594
1595 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1596 assert (field != NULL, "illegal field");
1597 JVMWrapper("JVM_GetFieldTypeAnnotations");
1598
1599 fieldDescriptor fd;
1600 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1601 if (!gotFd) {
1602 return NULL;
1603 }
1604
1605 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1606 JVM_END
1607
1608 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1609 if (!cp->is_within_bounds(index)) {
1610 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1611 }
1612 }
1613
1614 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1615 {
1616 JVMWrapper("JVM_GetMethodParameters");
1617 // method is a handle to a java.lang.reflect.Method object
1618 Method* method_ptr = jvm_get_method_common(method);
1619 methodHandle mh (THREAD, method_ptr);
1620 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1621 const int num_params = mh->method_parameters_length();
1622
1623 if (0 != num_params) {
1624 // make sure all the symbols are properly formatted
1625 for (int i = 0; i < num_params; i++) {
1626 MethodParametersElement* params = mh->method_parameters_start();
1627 int index = params[i].name_cp_index;
1628 bounds_check(mh->constants(), index, CHECK_NULL);
1629
1630 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1631 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1632 "Wrong type at constant pool index");
1633 }
1634
1635 }
1636
1637 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1638 objArrayHandle result (THREAD, result_oop);
1639
1640 for (int i = 0; i < num_params; i++) {
1641 MethodParametersElement* params = mh->method_parameters_start();
1642 // For a 0 index, give a NULL symbol
1643 Symbol* sym = 0 != params[i].name_cp_index ?
1644 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1645 int flags = params[i].flags;
1646 oop param = Reflection::new_parameter(reflected_method, i, sym,
1647 flags, CHECK_NULL);
1648 result->obj_at_put(i, param);
1649 }
1650 return (jobjectArray)JNIHandles::make_local(env, result());
1651 } else {
1652 return (jobjectArray)NULL;
1653 }
1654 }
1655 JVM_END
1656
1657 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1658
1659 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1660 {
1661 JVMWrapper("JVM_GetClassDeclaredFields");
1662 JvmtiVMObjectAllocEventCollector oam;
1663
1664 // Exclude primitive types and array types
1665 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1666 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
1667 // Return empty array
1668 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1669 return (jobjectArray) JNIHandles::make_local(env, res);
1670 }
1671
1672 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1673 constantPoolHandle cp(THREAD, k->constants());
1674
1675 // Ensure class is linked
1676 k->link_class(CHECK_NULL);
1677
1678 // 4496456 We need to filter out java.lang.Throwable.backtrace
1679 bool skip_backtrace = false;
1680
1681 // Allocate result
1682 int num_fields;
1683
1684 if (publicOnly) {
1685 num_fields = 0;
1686 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
1687 if (fs.access_flags().is_public()) ++num_fields;
1688 }
1689 } else {
1690 num_fields = k->java_fields_count();
1691
1692 if (k() == SystemDictionary::Throwable_klass()) {
1693 num_fields--;
1694 skip_backtrace = true;
1695 }
1696 }
1697
1698 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1699 objArrayHandle result (THREAD, r);
1700
1701 int out_idx = 0;
1702 fieldDescriptor fd;
1703 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1704 if (skip_backtrace) {
1705 // 4496456 skip java.lang.Throwable.backtrace
1706 int offset = fs.offset();
1707 if (offset == java_lang_Throwable::get_backtrace_offset()) continue;
1708 }
1709
1710 if (!publicOnly || fs.access_flags().is_public()) {
1711 fd.reinitialize(k(), fs.index());
1712 oop field = Reflection::new_field(&fd, CHECK_NULL);
1713 result->obj_at_put(out_idx, field);
1714 ++out_idx;
1715 }
1716 }
1717 assert(out_idx == num_fields, "just checking");
1718 return (jobjectArray) JNIHandles::make_local(env, result());
1719 }
1720 JVM_END
1721
1722 static bool select_method(methodHandle method, bool want_constructor) {
1723 if (want_constructor) {
1724 return (method->is_initializer() && !method->is_static());
1725 } else {
1726 return (!method->is_initializer() && !method->is_overpass());
1727 }
1728 }
1729
1730 static jobjectArray get_class_declared_methods_helper(
1731 JNIEnv *env,
1732 jclass ofClass, jboolean publicOnly,
1733 bool want_constructor,
1734 Klass* klass, TRAPS) {
1735
1736 JvmtiVMObjectAllocEventCollector oam;
1737
1738 // Exclude primitive types and array types
1739 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1740 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
1741 // Return empty array
1742 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1743 return (jobjectArray) JNIHandles::make_local(env, res);
1744 }
1745
1746 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1747
1748 // Ensure class is linked
1749 k->link_class(CHECK_NULL);
1750
1751 Array<Method*>* methods = k->methods();
1752 int methods_length = methods->length();
1753
1754 // Save original method_idnum in case of redefinition, which can change
1755 // the idnum of obsolete methods. The new method will have the same idnum
1756 // but if we refresh the methods array, the counts will be wrong.
1757 ResourceMark rm(THREAD);
1758 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1759 int num_methods = 0;
1760
1761 for (int i = 0; i < methods_length; i++) {
1762 methodHandle method(THREAD, methods->at(i));
1763 if (select_method(method, want_constructor)) {
1764 if (!publicOnly || method->is_public()) {
1765 idnums->push(method->method_idnum());
1766 ++num_methods;
1767 }
1768 }
1769 }
1770
1771 // Allocate result
1772 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1773 objArrayHandle result (THREAD, r);
1774
1775 // Now just put the methods that we selected above, but go by their idnum
1776 // in case of redefinition. The methods can be redefined at any safepoint,
1777 // so above when allocating the oop array and below when creating reflect
1778 // objects.
1779 for (int i = 0; i < num_methods; i++) {
1780 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1781 if (method.is_null()) {
1782 // Method may have been deleted and seems this API can handle null
1783 // Otherwise should probably put a method that throws NSME
1784 result->obj_at_put(i, NULL);
1785 } else {
1786 oop m;
1787 if (want_constructor) {
1788 m = Reflection::new_constructor(method, CHECK_NULL);
1789 } else {
1790 m = Reflection::new_method(method, false, CHECK_NULL);
1791 }
1792 result->obj_at_put(i, m);
1793 }
1794 }
1795
1796 return (jobjectArray) JNIHandles::make_local(env, result());
1797 }
1798
1799 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1800 {
1801 JVMWrapper("JVM_GetClassDeclaredMethods");
1802 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1803 /*want_constructor*/ false,
1804 SystemDictionary::reflect_Method_klass(), THREAD);
1805 }
1806 JVM_END
1807
1808 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1809 {
1810 JVMWrapper("JVM_GetClassDeclaredConstructors");
1811 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1812 /*want_constructor*/ true,
1813 SystemDictionary::reflect_Constructor_klass(), THREAD);
1814 }
1815 JVM_END
1816
1817 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1818 {
1819 JVMWrapper("JVM_GetClassAccessFlags");
1820 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1821 // Primitive type
1822 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1823 }
1824
1825 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1826 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1827 }
1828 JVM_END
1829
1830
1831 // Constant pool access //////////////////////////////////////////////////////////
1832
1833 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1834 {
1835 JVMWrapper("JVM_GetClassConstantPool");
1836 JvmtiVMObjectAllocEventCollector oam;
1837
1838 // Return null for primitives and arrays
1839 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1840 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1841 if (k->oop_is_instance()) {
1842 instanceKlassHandle k_h(THREAD, k);
1843 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL);
1844 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1845 return JNIHandles::make_local(jcp());
1846 }
1847 }
1848 return NULL;
1849 }
1850 JVM_END
1851
1852
1853 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1854 {
1855 JVMWrapper("JVM_ConstantPoolGetSize");
1856 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1857 return cp->length();
1858 }
1859 JVM_END
1860
1861
1862 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1863 {
1864 JVMWrapper("JVM_ConstantPoolGetClassAt");
1865 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1866 bounds_check(cp, index, CHECK_NULL);
1867 constantTag tag = cp->tag_at(index);
1868 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1869 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1870 }
1871 Klass* k = cp->klass_at(index, CHECK_NULL);
1872 return (jclass) JNIHandles::make_local(k->java_mirror());
1873 }
1874 JVM_END
1875
1876 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1877 {
1878 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1879 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1880 bounds_check(cp, index, CHECK_NULL);
1881 constantTag tag = cp->tag_at(index);
1882 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1883 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1884 }
1885 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1886 if (k == NULL) return NULL;
1887 return (jclass) JNIHandles::make_local(k->java_mirror());
1888 }
1889 JVM_END
1890
1891 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1892 constantTag tag = cp->tag_at(index);
1893 if (!tag.is_method() && !tag.is_interface_method()) {
1894 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1895 }
1896 int klass_ref = cp->uncached_klass_ref_index_at(index);
1897 Klass* k_o;
1898 if (force_resolution) {
1899 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1900 } else {
1901 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1902 if (k_o == NULL) return NULL;
1903 }
1904 instanceKlassHandle k(THREAD, k_o);
1905 Symbol* name = cp->uncached_name_ref_at(index);
1906 Symbol* sig = cp->uncached_signature_ref_at(index);
1907 methodHandle m (THREAD, k->find_method(name, sig));
1908 if (m.is_null()) {
1909 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1910 }
1911 oop method;
1912 if (!m->is_initializer() || m->is_static()) {
1913 method = Reflection::new_method(m, true, CHECK_NULL);
1914 } else {
1915 method = Reflection::new_constructor(m, CHECK_NULL);
1916 }
1917 return JNIHandles::make_local(method);
1918 }
1919
1920 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1921 {
1922 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1923 JvmtiVMObjectAllocEventCollector oam;
1924 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1925 bounds_check(cp, index, CHECK_NULL);
1926 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1927 return res;
1928 }
1929 JVM_END
1930
1931 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1932 {
1933 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1934 JvmtiVMObjectAllocEventCollector oam;
1935 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1936 bounds_check(cp, index, CHECK_NULL);
1937 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1938 return res;
1939 }
1940 JVM_END
1941
1942 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1943 constantTag tag = cp->tag_at(index);
1944 if (!tag.is_field()) {
1945 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1946 }
1947 int klass_ref = cp->uncached_klass_ref_index_at(index);
1948 Klass* k_o;
1949 if (force_resolution) {
1950 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1951 } else {
1952 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1953 if (k_o == NULL) return NULL;
1954 }
1955 instanceKlassHandle k(THREAD, k_o);
1956 Symbol* name = cp->uncached_name_ref_at(index);
1957 Symbol* sig = cp->uncached_signature_ref_at(index);
1958 fieldDescriptor fd;
1959 Klass* target_klass = k->find_field(name, sig, &fd);
1960 if (target_klass == NULL) {
1961 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
1962 }
1963 oop field = Reflection::new_field(&fd, CHECK_NULL);
1964 return JNIHandles::make_local(field);
1965 }
1966
1967 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
1968 {
1969 JVMWrapper("JVM_ConstantPoolGetFieldAt");
1970 JvmtiVMObjectAllocEventCollector oam;
1971 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1972 bounds_check(cp, index, CHECK_NULL);
1973 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
1974 return res;
1975 }
1976 JVM_END
1977
1978 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1979 {
1980 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
1981 JvmtiVMObjectAllocEventCollector oam;
1982 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1983 bounds_check(cp, index, CHECK_NULL);
1984 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
1985 return res;
1986 }
1987 JVM_END
1988
1989 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1990 {
1991 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
1992 JvmtiVMObjectAllocEventCollector oam;
1993 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1994 bounds_check(cp, index, CHECK_NULL);
1995 constantTag tag = cp->tag_at(index);
1996 if (!tag.is_field_or_method()) {
1997 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1998 }
1999 int klass_ref = cp->uncached_klass_ref_index_at(index);
2000 Symbol* klass_name = cp->klass_name_at(klass_ref);
2001 Symbol* member_name = cp->uncached_name_ref_at(index);
2002 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2003 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2004 objArrayHandle dest(THREAD, dest_o);
2005 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2006 dest->obj_at_put(0, str());
2007 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2008 dest->obj_at_put(1, str());
2009 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2010 dest->obj_at_put(2, str());
2011 return (jobjectArray) JNIHandles::make_local(dest());
2012 }
2013 JVM_END
2014
2015 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2016 {
2017 JVMWrapper("JVM_ConstantPoolGetIntAt");
2018 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2019 bounds_check(cp, index, CHECK_0);
2020 constantTag tag = cp->tag_at(index);
2021 if (!tag.is_int()) {
2022 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2023 }
2024 return cp->int_at(index);
2025 }
2026 JVM_END
2027
2028 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2029 {
2030 JVMWrapper("JVM_ConstantPoolGetLongAt");
2031 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2032 bounds_check(cp, index, CHECK_(0L));
2033 constantTag tag = cp->tag_at(index);
2034 if (!tag.is_long()) {
2035 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2036 }
2037 return cp->long_at(index);
2038 }
2039 JVM_END
2040
2041 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2042 {
2043 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2044 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2045 bounds_check(cp, index, CHECK_(0.0f));
2046 constantTag tag = cp->tag_at(index);
2047 if (!tag.is_float()) {
2048 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2049 }
2050 return cp->float_at(index);
2051 }
2052 JVM_END
2053
2054 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2055 {
2056 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2057 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2058 bounds_check(cp, index, CHECK_(0.0));
2059 constantTag tag = cp->tag_at(index);
2060 if (!tag.is_double()) {
2061 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2062 }
2063 return cp->double_at(index);
2064 }
2065 JVM_END
2066
2067 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2068 {
2069 JVMWrapper("JVM_ConstantPoolGetStringAt");
2070 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2071 bounds_check(cp, index, CHECK_NULL);
2072 constantTag tag = cp->tag_at(index);
2073 if (!tag.is_string()) {
2074 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2075 }
2076 oop str = cp->string_at(index, CHECK_NULL);
2077 return (jstring) JNIHandles::make_local(str);
2078 }
2079 JVM_END
2080
2081 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2082 {
2083 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2084 JvmtiVMObjectAllocEventCollector oam;
2085 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2086 bounds_check(cp, index, CHECK_NULL);
2087 constantTag tag = cp->tag_at(index);
2088 if (!tag.is_symbol()) {
2089 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2090 }
2091 Symbol* sym = cp->symbol_at(index);
2092 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2093 return (jstring) JNIHandles::make_local(str());
2094 }
2095 JVM_END
2096
2097
2098 // Assertion support. //////////////////////////////////////////////////////////
2099
2100 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2101 JVMWrapper("JVM_DesiredAssertionStatus");
2102 assert(cls != NULL, "bad class");
2103
2104 oop r = JNIHandles::resolve(cls);
2105 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2106 if (java_lang_Class::is_primitive(r)) return false;
2107
2108 Klass* k = java_lang_Class::as_Klass(r);
2109 assert(k->oop_is_instance(), "must be an instance klass");
2110 if (! k->oop_is_instance()) return false;
2111
2112 ResourceMark rm(THREAD);
2113 const char* name = k->name()->as_C_string();
2114 bool system_class = k->class_loader() == NULL;
2115 return JavaAssertions::enabled(name, system_class);
2116
2117 JVM_END
2118
2119
2120 // Return a new AssertionStatusDirectives object with the fields filled in with
2121 // command-line assertion arguments (i.e., -ea, -da).
2122 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2123 JVMWrapper("JVM_AssertionStatusDirectives");
2124 JvmtiVMObjectAllocEventCollector oam;
2125 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2126 return JNIHandles::make_local(env, asd);
2127 JVM_END
2128
2129 // Verification ////////////////////////////////////////////////////////////////////////////////
2130
2131 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2132
2133 // RedefineClasses support: bug 6214132 caused verification to fail.
2134 // All functions from this section should call the jvmtiThreadSate function:
2135 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2136 // The function returns a Klass* of the _scratch_class if the verifier
2137 // was invoked in the middle of the class redefinition.
2138 // Otherwise it returns its argument value which is the _the_class Klass*.
2139 // Please, refer to the description in the jvmtiThreadSate.hpp.
2140
2141 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2142 JVMWrapper("JVM_GetClassNameUTF");
2143 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2144 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2145 return k->name()->as_utf8();
2146 JVM_END
2147
2148
2149 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2150 JVMWrapper("JVM_GetClassCPTypes");
2151 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2152 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2153 // types will have length zero if this is not an InstanceKlass
2154 // (length is determined by call to JVM_GetClassCPEntriesCount)
2155 if (k->oop_is_instance()) {
2156 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2157 for (int index = cp->length() - 1; index >= 0; index--) {
2158 constantTag tag = cp->tag_at(index);
2159 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2160 }
2161 }
2162 JVM_END
2163
2164
2165 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2166 JVMWrapper("JVM_GetClassCPEntriesCount");
2167 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2168 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2169 if (!k->oop_is_instance())
2170 return 0;
2171 return InstanceKlass::cast(k)->constants()->length();
2172 JVM_END
2173
2174
2175 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2176 JVMWrapper("JVM_GetClassFieldsCount");
2177 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2178 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2179 if (!k->oop_is_instance())
2180 return 0;
2181 return InstanceKlass::cast(k)->java_fields_count();
2182 JVM_END
2183
2184
2185 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2186 JVMWrapper("JVM_GetClassMethodsCount");
2187 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2188 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2189 if (!k->oop_is_instance())
2190 return 0;
2191 return InstanceKlass::cast(k)->methods()->length();
2192 JVM_END
2193
2194
2195 // The following methods, used for the verifier, are never called with
2196 // array klasses, so a direct cast to InstanceKlass is safe.
2197 // Typically, these methods are called in a loop with bounds determined
2198 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2199 // zero for arrays.
2200 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2201 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2202 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2203 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2204 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2205 int length = method->checked_exceptions_length();
2206 if (length > 0) {
2207 CheckedExceptionElement* table= method->checked_exceptions_start();
2208 for (int i = 0; i < length; i++) {
2209 exceptions[i] = table[i].class_cp_index;
2210 }
2211 }
2212 JVM_END
2213
2214
2215 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2216 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2217 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2218 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2219 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2220 return method->checked_exceptions_length();
2221 JVM_END
2222
2223
2224 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2225 JVMWrapper("JVM_GetMethodIxByteCode");
2226 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2227 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2228 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2229 memcpy(code, method->code_base(), method->code_size());
2230 JVM_END
2231
2232
2233 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2234 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2235 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2236 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2237 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2238 return method->code_size();
2239 JVM_END
2240
2241
2242 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2243 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2244 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2245 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2246 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2247 ExceptionTable extable(method);
2248 entry->start_pc = extable.start_pc(entry_index);
2249 entry->end_pc = extable.end_pc(entry_index);
2250 entry->handler_pc = extable.handler_pc(entry_index);
2251 entry->catchType = extable.catch_type_index(entry_index);
2252 JVM_END
2253
2254
2255 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2256 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2257 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2258 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2259 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2260 return method->exception_table_length();
2261 JVM_END
2262
2263
2264 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2265 JVMWrapper("JVM_GetMethodIxModifiers");
2266 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2267 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2268 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2269 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2270 JVM_END
2271
2272
2273 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2274 JVMWrapper("JVM_GetFieldIxModifiers");
2275 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2276 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2277 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2278 JVM_END
2279
2280
2281 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2282 JVMWrapper("JVM_GetMethodIxLocalsCount");
2283 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2284 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2285 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2286 return method->max_locals();
2287 JVM_END
2288
2289
2290 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2291 JVMWrapper("JVM_GetMethodIxArgsSize");
2292 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2293 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2294 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2295 return method->size_of_parameters();
2296 JVM_END
2297
2298
2299 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2300 JVMWrapper("JVM_GetMethodIxMaxStack");
2301 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2302 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2303 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2304 return method->verifier_max_stack();
2305 JVM_END
2306
2307
2308 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2309 JVMWrapper("JVM_IsConstructorIx");
2310 ResourceMark rm(THREAD);
2311 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2312 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2313 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2314 return method->name() == vmSymbols::object_initializer_name();
2315 JVM_END
2316
2317
2318 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2319 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2320 ResourceMark rm(THREAD);
2321 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2322 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2323 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2324 return method->is_overpass();
2325 JVM_END
2326
2327 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2328 JVMWrapper("JVM_GetMethodIxIxUTF");
2329 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2330 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2331 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2332 return method->name()->as_utf8();
2333 JVM_END
2334
2335
2336 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2337 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2338 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2339 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2340 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2341 return method->signature()->as_utf8();
2342 JVM_END
2343
2344 /**
2345 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2346 * read entries in the constant pool. Since the old verifier always
2347 * works on a copy of the code, it will not see any rewriting that
2348 * may possibly occur in the middle of verification. So it is important
2349 * that nothing it calls tries to use the cpCache instead of the raw
2350 * constant pool, so we must use cp->uncached_x methods when appropriate.
2351 */
2352 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2353 JVMWrapper("JVM_GetCPFieldNameUTF");
2354 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2355 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2356 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2357 switch (cp->tag_at(cp_index).value()) {
2358 case JVM_CONSTANT_Fieldref:
2359 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2360 default:
2361 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2362 }
2363 ShouldNotReachHere();
2364 return NULL;
2365 JVM_END
2366
2367
2368 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2369 JVMWrapper("JVM_GetCPMethodNameUTF");
2370 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2371 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2372 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2373 switch (cp->tag_at(cp_index).value()) {
2374 case JVM_CONSTANT_InterfaceMethodref:
2375 case JVM_CONSTANT_Methodref:
2376 case JVM_CONSTANT_NameAndType: // for invokedynamic
2377 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2378 default:
2379 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2380 }
2381 ShouldNotReachHere();
2382 return NULL;
2383 JVM_END
2384
2385
2386 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2387 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2388 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2389 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2390 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2391 switch (cp->tag_at(cp_index).value()) {
2392 case JVM_CONSTANT_InterfaceMethodref:
2393 case JVM_CONSTANT_Methodref:
2394 case JVM_CONSTANT_NameAndType: // for invokedynamic
2395 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2396 default:
2397 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2398 }
2399 ShouldNotReachHere();
2400 return NULL;
2401 JVM_END
2402
2403
2404 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2405 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2406 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2407 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2408 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2409 switch (cp->tag_at(cp_index).value()) {
2410 case JVM_CONSTANT_Fieldref:
2411 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2412 default:
2413 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2414 }
2415 ShouldNotReachHere();
2416 return NULL;
2417 JVM_END
2418
2419
2420 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2421 JVMWrapper("JVM_GetCPClassNameUTF");
2422 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2423 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2424 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2425 Symbol* classname = cp->klass_name_at(cp_index);
2426 return classname->as_utf8();
2427 JVM_END
2428
2429
2430 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2431 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2432 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2433 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2434 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2435 switch (cp->tag_at(cp_index).value()) {
2436 case JVM_CONSTANT_Fieldref: {
2437 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2438 Symbol* classname = cp->klass_name_at(class_index);
2439 return classname->as_utf8();
2440 }
2441 default:
2442 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2443 }
2444 ShouldNotReachHere();
2445 return NULL;
2446 JVM_END
2447
2448
2449 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2450 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2451 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2452 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2453 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2454 switch (cp->tag_at(cp_index).value()) {
2455 case JVM_CONSTANT_Methodref:
2456 case JVM_CONSTANT_InterfaceMethodref: {
2457 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2458 Symbol* classname = cp->klass_name_at(class_index);
2459 return classname->as_utf8();
2460 }
2461 default:
2462 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2463 }
2464 ShouldNotReachHere();
2465 return NULL;
2466 JVM_END
2467
2468
2469 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2470 JVMWrapper("JVM_GetCPFieldModifiers");
2471 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2472 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2473 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2474 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2475 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2476 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2477 switch (cp->tag_at(cp_index).value()) {
2478 case JVM_CONSTANT_Fieldref: {
2479 Symbol* name = cp->uncached_name_ref_at(cp_index);
2480 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2481 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2482 if (fs.name() == name && fs.signature() == signature) {
2483 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2484 }
2485 }
2486 return -1;
2487 }
2488 default:
2489 fatal("JVM_GetCPFieldModifiers: illegal constant");
2490 }
2491 ShouldNotReachHere();
2492 return 0;
2493 JVM_END
2494
2495
2496 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2497 JVMWrapper("JVM_GetCPMethodModifiers");
2498 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2499 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2500 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2501 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2502 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2503 switch (cp->tag_at(cp_index).value()) {
2504 case JVM_CONSTANT_Methodref:
2505 case JVM_CONSTANT_InterfaceMethodref: {
2506 Symbol* name = cp->uncached_name_ref_at(cp_index);
2507 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2508 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2509 int methods_count = methods->length();
2510 for (int i = 0; i < methods_count; i++) {
2511 Method* method = methods->at(i);
2512 if (method->name() == name && method->signature() == signature) {
2513 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2514 }
2515 }
2516 return -1;
2517 }
2518 default:
2519 fatal("JVM_GetCPMethodModifiers: illegal constant");
2520 }
2521 ShouldNotReachHere();
2522 return 0;
2523 JVM_END
2524
2525
2526 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2527
2528 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2529 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2530 JVM_END
2531
2532
2533 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2534 JVMWrapper("JVM_IsSameClassPackage");
2535 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2536 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2537 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2538 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2539 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2540 JVM_END
2541
2542 // Printing support //////////////////////////////////////////////////
2543 extern "C" {
2544
2545 ATTRIBUTE_PRINTF(3, 0)
2546 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2547 // see bug 4399518, 4417214
2548 if ((intptr_t)count <= 0) return -1;
2549 return vsnprintf(str, count, fmt, args);
2550 }
2551
2552 ATTRIBUTE_PRINTF(3, 0)
2553 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2554 va_list args;
2555 int len;
2556 va_start(args, fmt);
2557 len = jio_vsnprintf(str, count, fmt, args);
2558 va_end(args);
2559 return len;
2560 }
2561
2562 ATTRIBUTE_PRINTF(2,3)
2563 int jio_fprintf(FILE* f, const char *fmt, ...) {
2564 int len;
2565 va_list args;
2566 va_start(args, fmt);
2567 len = jio_vfprintf(f, fmt, args);
2568 va_end(args);
2569 return len;
2570 }
2571
2572 ATTRIBUTE_PRINTF(2, 0)
2573 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2574 if (Arguments::vfprintf_hook() != NULL) {
2575 return Arguments::vfprintf_hook()(f, fmt, args);
2576 } else {
2577 return vfprintf(f, fmt, args);
2578 }
2579 }
2580
2581 ATTRIBUTE_PRINTF(1, 2)
2582 JNIEXPORT int jio_printf(const char *fmt, ...) {
2583 int len;
2584 va_list args;
2585 va_start(args, fmt);
2586 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2587 va_end(args);
2588 return len;
2589 }
2590
2591
2592 // HotSpot specific jio method
2593 void jio_print(const char* s) {
2594 // Try to make this function as atomic as possible.
2595 if (Arguments::vfprintf_hook() != NULL) {
2596 jio_fprintf(defaultStream::output_stream(), "%s", s);
2597 } else {
2598 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2599 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2600 }
2601 }
2602
2603 } // Extern C
2604
2605 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2606
2607 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2608 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2609 // OSThread objects. The exception to this rule is when the target object is the thread
2610 // doing the operation, in which case we know that the thread won't exit until the
2611 // operation is done (all exits being voluntary). There are a few cases where it is
2612 // rather silly to do operations on yourself, like resuming yourself or asking whether
2613 // you are alive. While these can still happen, they are not subject to deadlocks if
2614 // the lock is held while the operation occurs (this is not the case for suspend, for
2615 // instance), and are very unlikely. Because IsAlive needs to be fast and its
2616 // implementation is local to this file, we always lock Threads_lock for that one.
2617
2618 static void thread_entry(JavaThread* thread, TRAPS) {
2619 HandleMark hm(THREAD);
2620 Handle obj(THREAD, thread->threadObj());
2621 JavaValue result(T_VOID);
2622 JavaCalls::call_virtual(&result,
2623 obj,
2624 KlassHandle(THREAD, SystemDictionary::Thread_klass()),
2625 vmSymbols::run_method_name(),
2626 vmSymbols::void_method_signature(),
2627 THREAD);
2628 }
2629
2630
2631 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2632 JVMWrapper("JVM_StartThread");
2633 JavaThread *native_thread = NULL;
2634
2635 // We cannot hold the Threads_lock when we throw an exception,
2636 // due to rank ordering issues. Example: we might need to grab the
2637 // Heap_lock while we construct the exception.
2638 bool throw_illegal_thread_state = false;
2639
2640 // We must release the Threads_lock before we can post a jvmti event
2641 // in Thread::start.
2642 {
2643 // Ensure that the C++ Thread and OSThread structures aren't freed before
2644 // we operate.
2645 MutexLocker mu(Threads_lock);
2646
2647 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2648 // re-starting an already started thread, so we should usually find
2649 // that the JavaThread is null. However for a JNI attached thread
2650 // there is a small window between the Thread object being created
2651 // (with its JavaThread set) and the update to its threadStatus, so we
2652 // have to check for this
2653 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2654 throw_illegal_thread_state = true;
2655 } else {
2656 // We could also check the stillborn flag to see if this thread was already stopped, but
2657 // for historical reasons we let the thread detect that itself when it starts running
2658
2659 jlong size =
2660 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2661 // Allocate the C++ Thread structure and create the native thread. The
2662 // stack size retrieved from java is signed, but the constructor takes
2663 // size_t (an unsigned type), so avoid passing negative values which would
2664 // result in really large stacks.
2665 size_t sz = size > 0 ? (size_t) size : 0;
2666 native_thread = new JavaThread(&thread_entry, sz);
2667
2668 // At this point it may be possible that no osthread was created for the
2669 // JavaThread due to lack of memory. Check for this situation and throw
2670 // an exception if necessary. Eventually we may want to change this so
2671 // that we only grab the lock if the thread was created successfully -
2672 // then we can also do this check and throw the exception in the
2673 // JavaThread constructor.
2674 if (native_thread->osthread() != NULL) {
2675 // Note: the current thread is not being used within "prepare".
2676 native_thread->prepare(jthread);
2677 }
2678 }
2679 }
2680
2681 if (throw_illegal_thread_state) {
2682 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2683 }
2684
2685 assert(native_thread != NULL, "Starting null thread?");
2686
2687 if (native_thread->osthread() == NULL) {
2688 // No one should hold a reference to the 'native_thread'.
2689 delete native_thread;
2690 if (JvmtiExport::should_post_resource_exhausted()) {
2691 JvmtiExport::post_resource_exhausted(
2692 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2693 os::native_thread_creation_failed_msg());
2694 }
2695 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2696 os::native_thread_creation_failed_msg());
2697 }
2698
2699 Thread::start(native_thread);
2700
2701 JVM_END
2702
2703 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2704 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2705 // but is thought to be reliable and simple. In the case, where the receiver is the
2706 // same thread as the sender, no safepoint is needed.
2707 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2708 JVMWrapper("JVM_StopThread");
2709
2710 oop java_throwable = JNIHandles::resolve(throwable);
2711 if (java_throwable == NULL) {
2712 THROW(vmSymbols::java_lang_NullPointerException());
2713 }
2714 oop java_thread = JNIHandles::resolve_non_null(jthread);
2715 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2716 Events::log_exception(JavaThread::current(),
2717 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2718 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2719 // First check if thread is alive
2720 if (receiver != NULL) {
2721 // Check if exception is getting thrown at self (use oop equality, since the
2722 // target object might exit)
2723 if (java_thread == thread->threadObj()) {
2724 THROW_OOP(java_throwable);
2725 } else {
2726 // Enques a VM_Operation to stop all threads and then deliver the exception...
2727 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2728 }
2729 }
2730 else {
2731 // Either:
2732 // - target thread has not been started before being stopped, or
2733 // - target thread already terminated
2734 // We could read the threadStatus to determine which case it is
2735 // but that is overkill as it doesn't matter. We must set the
2736 // stillborn flag for the first case, and if the thread has already
2737 // exited setting this flag has no affect
2738 java_lang_Thread::set_stillborn(java_thread);
2739 }
2740 JVM_END
2741
2742
2743 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2744 JVMWrapper("JVM_IsThreadAlive");
2745
2746 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2747 return java_lang_Thread::is_alive(thread_oop);
2748 JVM_END
2749
2750
2751 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2752 JVMWrapper("JVM_SuspendThread");
2753 oop java_thread = JNIHandles::resolve_non_null(jthread);
2754 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2755
2756 if (receiver != NULL) {
2757 // thread has run and has not exited (still on threads list)
2758
2759 {
2760 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2761 if (receiver->is_external_suspend()) {
2762 // Don't allow nested external suspend requests. We can't return
2763 // an error from this interface so just ignore the problem.
2764 return;
2765 }
2766 if (receiver->is_exiting()) { // thread is in the process of exiting
2767 return;
2768 }
2769 receiver->set_external_suspend();
2770 }
2771
2772 // java_suspend() will catch threads in the process of exiting
2773 // and will ignore them.
2774 receiver->java_suspend();
2775
2776 // It would be nice to have the following assertion in all the
2777 // time, but it is possible for a racing resume request to have
2778 // resumed this thread right after we suspended it. Temporarily
2779 // enable this assertion if you are chasing a different kind of
2780 // bug.
2781 //
2782 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2783 // receiver->is_being_ext_suspended(), "thread is not suspended");
2784 }
2785 JVM_END
2786
2787
2788 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2789 JVMWrapper("JVM_ResumeThread");
2790 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2791 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2792 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2793 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2794 // looks at it.
2795 MutexLocker ml(Threads_lock);
2796 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2797 if (thr != NULL) {
2798 // the thread has run and is not in the process of exiting
2799 thr->java_resume();
2800 }
2801 JVM_END
2802
2803
2804 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2805 JVMWrapper("JVM_SetThreadPriority");
2806 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2807 MutexLocker ml(Threads_lock);
2808 oop java_thread = JNIHandles::resolve_non_null(jthread);
2809 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2810 JavaThread* thr = java_lang_Thread::thread(java_thread);
2811 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
2812 Thread::set_priority(thr, (ThreadPriority)prio);
2813 }
2814 JVM_END
2815
2816
2817 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2818 JVMWrapper("JVM_Yield");
2819 if (os::dont_yield()) return;
2820 HOTSPOT_THREAD_YIELD();
2821
2822 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
2823 // Critical for similar threading behaviour
2824 if (ConvertYieldToSleep) {
2825 os::sleep(thread, MinSleepInterval, false);
2826 } else {
2827 os::naked_yield();
2828 }
2829 JVM_END
2830
2831
2832 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2833 JVMWrapper("JVM_Sleep");
2834
2835 if (millis < 0) {
2836 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2837 }
2838
2839 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2840 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2841 }
2842
2843 // Save current thread state and restore it at the end of this block.
2844 // And set new thread state to SLEEPING.
2845 JavaThreadSleepState jtss(thread);
2846
2847 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2848
2849 EventThreadSleep event;
2850
2851 if (millis == 0) {
2852 // When ConvertSleepToYield is on, this matches the classic VM implementation of
2853 // JVM_Sleep. Critical for similar threading behaviour (Win32)
2854 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
2855 // for SOLARIS
2856 if (ConvertSleepToYield) {
2857 os::naked_yield();
2858 } else {
2859 ThreadState old_state = thread->osthread()->get_state();
2860 thread->osthread()->set_state(SLEEPING);
2861 os::sleep(thread, MinSleepInterval, false);
2862 thread->osthread()->set_state(old_state);
2863 }
2864 } else {
2865 ThreadState old_state = thread->osthread()->get_state();
2866 thread->osthread()->set_state(SLEEPING);
2867 if (os::sleep(thread, millis, true) == OS_INTRPT) {
2868 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
2869 // us while we were sleeping. We do not overwrite those.
2870 if (!HAS_PENDING_EXCEPTION) {
2871 if (event.should_commit()) {
2872 event.set_time(millis);
2873 event.commit();
2874 }
2875 HOTSPOT_THREAD_SLEEP_END(1);
2876
2877 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2878 // to properly restore the thread state. That's likely wrong.
2879 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2880 }
2881 }
2882 thread->osthread()->set_state(old_state);
2883 }
2884 if (event.should_commit()) {
2885 event.set_time(millis);
2886 event.commit();
2887 }
2888 HOTSPOT_THREAD_SLEEP_END(0);
2889 JVM_END
2890
2891 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
2892 JVMWrapper("JVM_CurrentThread");
2893 oop jthread = thread->threadObj();
2894 assert (thread != NULL, "no current thread!");
2895 return JNIHandles::make_local(env, jthread);
2896 JVM_END
2897
2898
2899 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
2900 JVMWrapper("JVM_CountStackFrames");
2901
2902 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2903 oop java_thread = JNIHandles::resolve_non_null(jthread);
2904 bool throw_illegal_thread_state = false;
2905 int count = 0;
2906
2907 {
2908 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
2909 // We need to re-resolve the java_thread, since a GC might have happened during the
2910 // acquire of the lock
2911 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2912
2913 if (thr == NULL) {
2914 // do nothing
2915 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
2916 // Check whether this java thread has been suspended already. If not, throws
2917 // IllegalThreadStateException. We defer to throw that exception until
2918 // Threads_lock is released since loading exception class has to leave VM.
2919 // The correct way to test a thread is actually suspended is
2920 // wait_for_ext_suspend_completion(), but we can't call that while holding
2921 // the Threads_lock. The above tests are sufficient for our purposes
2922 // provided the walkability of the stack is stable - which it isn't
2923 // 100% but close enough for most practical purposes.
2924 throw_illegal_thread_state = true;
2925 } else {
2926 // Count all java activation, i.e., number of vframes
2927 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
2928 // Native frames are not counted
2929 if (!vfst.method()->is_native()) count++;
2930 }
2931 }
2932 }
2933
2934 if (throw_illegal_thread_state) {
2935 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
2936 "this thread is not suspended");
2937 }
2938 return count;
2939 JVM_END
2940
2941 // Consider: A better way to implement JVM_Interrupt() is to acquire
2942 // Threads_lock to resolve the jthread into a Thread pointer, fetch
2943 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
2944 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
2945 // outside the critical section. Threads_lock is hot so we want to minimize
2946 // the hold-time. A cleaner interface would be to decompose interrupt into
2947 // two steps. The 1st phase, performed under Threads_lock, would return
2948 // a closure that'd be invoked after Threads_lock was dropped.
2949 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
2950 // admit spurious wakeups.
2951
2952 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
2953 JVMWrapper("JVM_Interrupt");
2954
2955 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2956 oop java_thread = JNIHandles::resolve_non_null(jthread);
2957 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
2958 // We need to re-resolve the java_thread, since a GC might have happened during the
2959 // acquire of the lock
2960 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2961 if (thr != NULL) {
2962 Thread::interrupt(thr);
2963 }
2964 JVM_END
2965
2966
2967 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
2968 JVMWrapper("JVM_IsInterrupted");
2969
2970 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2971 oop java_thread = JNIHandles::resolve_non_null(jthread);
2972 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
2973 // We need to re-resolve the java_thread, since a GC might have happened during the
2974 // acquire of the lock
2975 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2976 if (thr == NULL) {
2977 return JNI_FALSE;
2978 } else {
2979 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
2980 }
2981 JVM_END
2982
2983
2984 // Return true iff the current thread has locked the object passed in
2985
2986 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
2987 JVMWrapper("JVM_HoldsLock");
2988 assert(THREAD->is_Java_thread(), "sanity check");
2989 if (obj == NULL) {
2990 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
2991 }
2992 Handle h_obj(THREAD, JNIHandles::resolve(obj));
2993 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
2994 JVM_END
2995
2996
2997 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
2998 JVMWrapper("JVM_DumpAllStacks");
2999 VM_PrintThreads op;
3000 VMThread::execute(&op);
3001 if (JvmtiExport::should_post_data_dump()) {
3002 JvmtiExport::post_data_dump();
3003 }
3004 JVM_END
3005
3006 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3007 JVMWrapper("JVM_SetNativeThreadName");
3008 ResourceMark rm(THREAD);
3009 oop java_thread = JNIHandles::resolve_non_null(jthread);
3010 JavaThread* thr = java_lang_Thread::thread(java_thread);
3011 // Thread naming only supported for the current thread, doesn't work for
3012 // target threads.
3013 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3014 // we don't set the name of an attached thread to avoid stepping
3015 // on other programs
3016 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3017 os::set_native_thread_name(thread_name);
3018 }
3019 JVM_END
3020
3021 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3022
3023 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3024 assert(jthread->is_Java_thread(), "must be a Java thread");
3025 if (jthread->privileged_stack_top() == NULL) return false;
3026 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3027 oop loader = jthread->privileged_stack_top()->class_loader();
3028 if (loader == NULL) return true;
3029 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3030 if (trusted) return true;
3031 }
3032 return false;
3033 }
3034
3035 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3036 JVMWrapper("JVM_CurrentLoadedClass");
3037 ResourceMark rm(THREAD);
3038
3039 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3040 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3041 bool trusted = is_trusted_frame(thread, &vfst);
3042 if (trusted) return NULL;
3043
3044 Method* m = vfst.method();
3045 if (!m->is_native()) {
3046 InstanceKlass* holder = m->method_holder();
3047 oop loader = holder->class_loader();
3048 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3049 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3050 }
3051 }
3052 }
3053 return NULL;
3054 JVM_END
3055
3056
3057 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3058 JVMWrapper("JVM_CurrentClassLoader");
3059 ResourceMark rm(THREAD);
3060
3061 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3062
3063 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3064 bool trusted = is_trusted_frame(thread, &vfst);
3065 if (trusted) return NULL;
3066
3067 Method* m = vfst.method();
3068 if (!m->is_native()) {
3069 InstanceKlass* holder = m->method_holder();
3070 assert(holder->is_klass(), "just checking");
3071 oop loader = holder->class_loader();
3072 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3073 return JNIHandles::make_local(env, loader);
3074 }
3075 }
3076 }
3077 return NULL;
3078 JVM_END
3079
3080
3081 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3082 JVMWrapper("JVM_GetClassContext");
3083 ResourceMark rm(THREAD);
3084 JvmtiVMObjectAllocEventCollector oam;
3085 vframeStream vfst(thread);
3086
3087 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3088 // This must only be called from SecurityManager.getClassContext
3089 Method* m = vfst.method();
3090 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3091 m->name() == vmSymbols::getClassContext_name() &&
3092 m->signature() == vmSymbols::void_class_array_signature())) {
3093 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3094 }
3095 }
3096
3097 // Collect method holders
3098 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3099 for (; !vfst.at_end(); vfst.security_next()) {
3100 Method* m = vfst.method();
3101 // Native frames are not returned
3102 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3103 Klass* holder = m->method_holder();
3104 assert(holder->is_klass(), "just checking");
3105 klass_array->append(holder);
3106 }
3107 }
3108
3109 // Create result array of type [Ljava/lang/Class;
3110 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3111 // Fill in mirrors corresponding to method holders
3112 for (int i = 0; i < klass_array->length(); i++) {
3113 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3114 }
3115
3116 return (jobjectArray) JNIHandles::make_local(env, result);
3117 JVM_END
3118
3119
3120 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3121 JVMWrapper("JVM_ClassDepth");
3122 ResourceMark rm(THREAD);
3123 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3124 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3125
3126 const char* str = java_lang_String::as_utf8_string(class_name_str());
3127 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3128 if (class_name_sym == NULL) {
3129 return -1;
3130 }
3131
3132 int depth = 0;
3133
3134 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3135 if (!vfst.method()->is_native()) {
3136 InstanceKlass* holder = vfst.method()->method_holder();
3137 assert(holder->is_klass(), "just checking");
3138 if (holder->name() == class_name_sym) {
3139 return depth;
3140 }
3141 depth++;
3142 }
3143 }
3144 return -1;
3145 JVM_END
3146
3147
3148 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3149 JVMWrapper("JVM_ClassLoaderDepth");
3150 ResourceMark rm(THREAD);
3151 int depth = 0;
3152 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3153 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3154 bool trusted = is_trusted_frame(thread, &vfst);
3155 if (trusted) return -1;
3156
3157 Method* m = vfst.method();
3158 if (!m->is_native()) {
3159 InstanceKlass* holder = m->method_holder();
3160 assert(holder->is_klass(), "just checking");
3161 oop loader = holder->class_loader();
3162 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3163 return depth;
3164 }
3165 depth++;
3166 }
3167 }
3168 return -1;
3169 JVM_END
3170
3171
3172 // java.lang.Package ////////////////////////////////////////////////////////////////
3173
3174
3175 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3176 JVMWrapper("JVM_GetSystemPackage");
3177 ResourceMark rm(THREAD);
3178 JvmtiVMObjectAllocEventCollector oam;
3179 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3180 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3181 return (jstring) JNIHandles::make_local(result);
3182 JVM_END
3183
3184
3185 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3186 JVMWrapper("JVM_GetSystemPackages");
3187 JvmtiVMObjectAllocEventCollector oam;
3188 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3189 return (jobjectArray) JNIHandles::make_local(result);
3190 JVM_END
3191
3192
3193 // ObjectInputStream ///////////////////////////////////////////////////////////////
3194
3195 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3196 if (current_class == NULL) {
3197 return true;
3198 }
3199 if ((current_class == field_class) || access.is_public()) {
3200 return true;
3201 }
3202
3203 if (access.is_protected()) {
3204 // See if current_class is a subclass of field_class
3205 if (current_class->is_subclass_of(field_class)) {
3206 return true;
3207 }
3208 }
3209
3210 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3211 }
3212
3213 // Return the first non-null class loader up the execution stack, or null
3214 // if only code from the null class loader is on the stack.
3215
3216 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3217 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3218 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3219 oop loader = vfst.method()->method_holder()->class_loader();
3220 if (loader != NULL) {
3221 return JNIHandles::make_local(env, loader);
3222 }
3223 }
3224 return NULL;
3225 JVM_END
3226
3227
3228 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3229
3230
3231 // resolve array handle and check arguments
3232 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3233 if (arr == NULL) {
3234 THROW_0(vmSymbols::java_lang_NullPointerException());
3235 }
3236 oop a = JNIHandles::resolve_non_null(arr);
3237 if (!a->is_array() || (type_array_only && !a->is_typeArray())) {
3238 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3239 }
3240 return arrayOop(a);
3241 }
3242
3243
3244 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3245 JVMWrapper("JVM_GetArrayLength");
3246 arrayOop a = check_array(env, arr, false, CHECK_0);
3247 return a->length();
3248 JVM_END
3249
3250
3251 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3252 JVMWrapper("JVM_Array_Get");
3253 JvmtiVMObjectAllocEventCollector oam;
3254 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3255 jvalue value;
3256 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3257 oop box = Reflection::box(&value, type, CHECK_NULL);
3258 return JNIHandles::make_local(env, box);
3259 JVM_END
3260
3261
3262 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3263 JVMWrapper("JVM_GetPrimitiveArrayElement");
3264 jvalue value;
3265 value.i = 0; // to initialize value before getting used in CHECK
3266 arrayOop a = check_array(env, arr, true, CHECK_(value));
3267 assert(a->is_typeArray(), "just checking");
3268 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3269 BasicType wide_type = (BasicType) wCode;
3270 if (type != wide_type) {
3271 Reflection::widen(&value, type, wide_type, CHECK_(value));
3272 }
3273 return value;
3274 JVM_END
3275
3276
3277 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3278 JVMWrapper("JVM_SetArrayElement");
3279 arrayOop a = check_array(env, arr, false, CHECK);
3280 oop box = JNIHandles::resolve(val);
3281 jvalue value;
3282 value.i = 0; // to initialize value before getting used in CHECK
3283 BasicType value_type;
3284 if (a->is_objArray()) {
3285 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3286 value_type = Reflection::unbox_for_regular_object(box, &value);
3287 } else {
3288 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3289 }
3290 Reflection::array_set(&value, a, index, value_type, CHECK);
3291 JVM_END
3292
3293
3294 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3295 JVMWrapper("JVM_SetPrimitiveArrayElement");
3296 arrayOop a = check_array(env, arr, true, CHECK);
3297 assert(a->is_typeArray(), "just checking");
3298 BasicType value_type = (BasicType) vCode;
3299 Reflection::array_set(&v, a, index, value_type, CHECK);
3300 JVM_END
3301
3302
3303 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3304 JVMWrapper("JVM_NewArray");
3305 JvmtiVMObjectAllocEventCollector oam;
3306 oop element_mirror = JNIHandles::resolve(eltClass);
3307 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3308 return JNIHandles::make_local(env, result);
3309 JVM_END
3310
3311
3312 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3313 JVMWrapper("JVM_NewMultiArray");
3314 JvmtiVMObjectAllocEventCollector oam;
3315 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3316 oop element_mirror = JNIHandles::resolve(eltClass);
3317 assert(dim_array->is_typeArray(), "just checking");
3318 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3319 return JNIHandles::make_local(env, result);
3320 JVM_END
3321
3322
3323 // Library support ///////////////////////////////////////////////////////////////////////////
3324
3325 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3326 //%note jvm_ct
3327 JVMWrapper2("JVM_LoadLibrary (%s)", name);
3328 char ebuf[1024];
3329 void *load_result;
3330 {
3331 ThreadToNativeFromVM ttnfvm(thread);
3332 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3333 }
3334 if (load_result == NULL) {
3335 char msg[1024];
3336 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3337 // Since 'ebuf' may contain a string encoded using
3338 // platform encoding scheme, we need to pass
3339 // Exceptions::unsafe_to_utf8 to the new_exception method
3340 // as the last argument. See bug 6367357.
3341 Handle h_exception =
3342 Exceptions::new_exception(thread,
3343 vmSymbols::java_lang_UnsatisfiedLinkError(),
3344 msg, Exceptions::unsafe_to_utf8);
3345
3346 THROW_HANDLE_0(h_exception);
3347 }
3348 return load_result;
3349 JVM_END
3350
3351
3352 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3353 JVMWrapper("JVM_UnloadLibrary");
3354 os::dll_unload(handle);
3355 JVM_END
3356
3357
3358 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3359 JVMWrapper2("JVM_FindLibraryEntry (%s)", name);
3360 return os::dll_lookup(handle, name);
3361 JVM_END
3362
3363
3364 // JNI version ///////////////////////////////////////////////////////////////////////////////
3365
3366 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3367 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version);
3368 return Threads::is_supported_jni_version_including_1_1(version);
3369 JVM_END
3370
3371
3372 // String support ///////////////////////////////////////////////////////////////////////////
3373
3374 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3375 JVMWrapper("JVM_InternString");
3376 JvmtiVMObjectAllocEventCollector oam;
3377 if (str == NULL) return NULL;
3378 oop string = JNIHandles::resolve_non_null(str);
3379 oop result = StringTable::intern(string, CHECK_NULL);
3380 return (jstring) JNIHandles::make_local(env, result);
3381 JVM_END
3382
3383
3384 // Raw monitor support //////////////////////////////////////////////////////////////////////
3385
3386 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3387 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3388 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3389 // that only works with java threads.
3390
3391
3392 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3393 VM_Exit::block_if_vm_exited();
3394 JVMWrapper("JVM_RawMonitorCreate");
3395 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3396 }
3397
3398
3399 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3400 VM_Exit::block_if_vm_exited();
3401 JVMWrapper("JVM_RawMonitorDestroy");
3402 delete ((Mutex*) mon);
3403 }
3404
3405
3406 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3407 VM_Exit::block_if_vm_exited();
3408 JVMWrapper("JVM_RawMonitorEnter");
3409 ((Mutex*) mon)->jvm_raw_lock();
3410 return 0;
3411 }
3412
3413
3414 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3415 VM_Exit::block_if_vm_exited();
3416 JVMWrapper("JVM_RawMonitorExit");
3417 ((Mutex*) mon)->jvm_raw_unlock();
3418 }
3419
3420
3421 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3422
3423 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, Handle loader, Handle protection_domain, jboolean throwError, TRAPS) {
3424 // Security Note:
3425 // The Java level wrapper will perform the necessary security check allowing
3426 // us to pass the NULL as the initiating class loader.
3427 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3428
3429 KlassHandle klass_handle(THREAD, klass);
3430 // Check if we should initialize the class
3431 if (init && klass_handle->oop_is_instance()) {
3432 klass_handle->initialize(CHECK_NULL);
3433 }
3434 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
3435 }
3436
3437
3438 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3439
3440 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3441 JVMWrapper("JVM_InvokeMethod");
3442 Handle method_handle;
3443 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3444 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3445 Handle receiver(THREAD, JNIHandles::resolve(obj));
3446 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3447 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3448 jobject res = JNIHandles::make_local(env, result);
3449 if (JvmtiExport::should_post_vm_object_alloc()) {
3450 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3451 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3452 if (java_lang_Class::is_primitive(ret_type)) {
3453 // Only for primitive type vm allocates memory for java object.
3454 // See box() method.
3455 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3456 }
3457 }
3458 return res;
3459 } else {
3460 THROW_0(vmSymbols::java_lang_StackOverflowError());
3461 }
3462 JVM_END
3463
3464
3465 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3466 JVMWrapper("JVM_NewInstanceFromConstructor");
3467 oop constructor_mirror = JNIHandles::resolve(c);
3468 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3469 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3470 jobject res = JNIHandles::make_local(env, result);
3471 if (JvmtiExport::should_post_vm_object_alloc()) {
3472 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3473 }
3474 return res;
3475 JVM_END
3476
3477 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3478
3479 JVM_LEAF(jboolean, JVM_SupportsCX8())
3480 JVMWrapper("JVM_SupportsCX8");
3481 return VM_Version::supports_cx8();
3482 JVM_END
3483
3484 // DTrace ///////////////////////////////////////////////////////////////////
3485
3486 JVM_ENTRY(jint, JVM_DTraceGetVersion(JNIEnv* env))
3487 JVMWrapper("JVM_DTraceGetVersion");
3488 return (jint)JVM_TRACING_DTRACE_VERSION;
3489 JVM_END
3490
3491 JVM_ENTRY(jlong,JVM_DTraceActivate(
3492 JNIEnv* env, jint version, jstring module_name, jint providers_count,
3493 JVM_DTraceProvider* providers))
3494 JVMWrapper("JVM_DTraceActivate");
3495 return DTraceJSDT::activate(
3496 version, module_name, providers_count, providers, CHECK_0);
3497 JVM_END
3498
3499 JVM_ENTRY(jboolean,JVM_DTraceIsProbeEnabled(JNIEnv* env, jmethodID method))
3500 JVMWrapper("JVM_DTraceIsProbeEnabled");
3501 return DTraceJSDT::is_probe_enabled(method);
3502 JVM_END
3503
3504 JVM_ENTRY(void,JVM_DTraceDispose(JNIEnv* env, jlong handle))
3505 JVMWrapper("JVM_DTraceDispose");
3506 DTraceJSDT::dispose(handle);
3507 JVM_END
3508
3509 JVM_ENTRY(jboolean,JVM_DTraceIsSupported(JNIEnv* env))
3510 JVMWrapper("JVM_DTraceIsSupported");
3511 return DTraceJSDT::is_supported();
3512 JVM_END
3513
3514 // Returns an array of all live Thread objects (VM internal JavaThreads,
3515 // jvmti agent threads, and JNI attaching threads are skipped)
3516 // See CR 6404306 regarding JNI attaching threads
3517 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3518 ResourceMark rm(THREAD);
3519 ThreadsListEnumerator tle(THREAD, false, false);
3520 JvmtiVMObjectAllocEventCollector oam;
3521
3522 int num_threads = tle.num_threads();
3523 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3524 objArrayHandle threads_ah(THREAD, r);
3525
3526 for (int i = 0; i < num_threads; i++) {
3527 Handle h = tle.get_threadObj(i);
3528 threads_ah->obj_at_put(i, h());
3529 }
3530
3531 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3532 JVM_END
3533
3534
3535 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3536 // Return StackTraceElement[][], each element is the stack trace of a thread in
3537 // the corresponding entry in the given threads array
3538 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3539 JVMWrapper("JVM_DumpThreads");
3540 JvmtiVMObjectAllocEventCollector oam;
3541
3542 // Check if threads is null
3543 if (threads == NULL) {
3544 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3545 }
3546
3547 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3548 objArrayHandle ah(THREAD, a);
3549 int num_threads = ah->length();
3550 // check if threads is non-empty array
3551 if (num_threads == 0) {
3552 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3553 }
3554
3555 // check if threads is not an array of objects of Thread class
3556 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3557 if (k != SystemDictionary::Thread_klass()) {
3558 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3559 }
3560
3561 ResourceMark rm(THREAD);
3562
3563 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3564 for (int i = 0; i < num_threads; i++) {
3565 oop thread_obj = ah->obj_at(i);
3566 instanceHandle h(THREAD, (instanceOop) thread_obj);
3567 thread_handle_array->append(h);
3568 }
3569
3570 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3571 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3572
3573 JVM_END
3574
3575 // JVM monitoring and management support
3576 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3577 return Management::get_jmm_interface(version);
3578 JVM_END
3579
3580 // com.sun.tools.attach.VirtualMachine agent properties support
3581 //
3582 // Initialize the agent properties with the properties maintained in the VM
3583 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3584 JVMWrapper("JVM_InitAgentProperties");
3585 ResourceMark rm;
3586
3587 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3588
3589 PUTPROP(props, "sun.java.command", Arguments::java_command());
3590 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3591 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3592 return properties;
3593 JVM_END
3594
3595 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3596 {
3597 JVMWrapper("JVM_GetEnclosingMethodInfo");
3598 JvmtiVMObjectAllocEventCollector oam;
3599
3600 if (ofClass == NULL) {
3601 return NULL;
3602 }
3603 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3604 // Special handling for primitive objects
3605 if (java_lang_Class::is_primitive(mirror())) {
3606 return NULL;
3607 }
3608 Klass* k = java_lang_Class::as_Klass(mirror());
3609 if (!k->oop_is_instance()) {
3610 return NULL;
3611 }
3612 instanceKlassHandle ik_h(THREAD, k);
3613 int encl_method_class_idx = ik_h->enclosing_method_class_index();
3614 if (encl_method_class_idx == 0) {
3615 return NULL;
3616 }
3617 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3618 objArrayHandle dest(THREAD, dest_o);
3619 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3620 dest->obj_at_put(0, enc_k->java_mirror());
3621 int encl_method_method_idx = ik_h->enclosing_method_method_index();
3622 if (encl_method_method_idx != 0) {
3623 Symbol* sym = ik_h->constants()->symbol_at(
3624 extract_low_short_from_int(
3625 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3626 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3627 dest->obj_at_put(1, str());
3628 sym = ik_h->constants()->symbol_at(
3629 extract_high_short_from_int(
3630 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3631 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3632 dest->obj_at_put(2, str());
3633 }
3634 return (jobjectArray) JNIHandles::make_local(dest());
3635 }
3636 JVM_END
3637
3638 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3639 {
3640 memset(info, 0, info_size);
3641
3642 info->jvm_version = Abstract_VM_Version::jvm_version();
3643 info->update_version = 0; /* 0 in HotSpot Express VM */
3644 info->special_update_version = 0; /* 0 in HotSpot Express VM */
3645
3646 // when we add a new capability in the jvm_version_info struct, we should also
3647 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3648 // counter defined in runtimeService.cpp.
3649 info->is_attachable = AttachListener::is_attach_supported();
3650 }
3651 JVM_END