1 /*
2 * Copyright (c) 1997, 2015, 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.inline.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "gc/shared/barrierSet.inline.hpp"
33 #include "gc/shared/collectedHeap.inline.hpp"
34 #include "interpreter/bytecode.hpp"
35 #include "memory/oopFactory.hpp"
36 #include "memory/universe.inline.hpp"
37 #include "oops/fieldStreams.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/method.hpp"
40 #include "oops/objArrayKlass.hpp"
41 #include "oops/objArrayOop.inline.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvm.h"
44 #include "prims/jvm_misc.hpp"
45 #include "prims/jvmtiExport.hpp"
46 #include "prims/jvmtiThreadState.hpp"
47 #include "prims/nativeLookup.hpp"
48 #include "prims/privilegedStack.hpp"
49 #include "runtime/arguments.hpp"
50 #include "runtime/atomic.inline.hpp"
51 #include "runtime/handles.inline.hpp"
52 #include "runtime/init.hpp"
53 #include "runtime/interfaceSupport.hpp"
54 #include "runtime/java.hpp"
55 #include "runtime/javaCalls.hpp"
56 #include "runtime/jfieldIDWorkaround.hpp"
57 #include "runtime/orderAccess.inline.hpp"
58 #include "runtime/os.inline.hpp"
59 #include "runtime/perfData.hpp"
60 #include "runtime/reflection.hpp"
61 #include "runtime/thread.inline.hpp"
62 #include "runtime/vframe.hpp"
63 #include "runtime/vm_operations.hpp"
64 #include "runtime/vm_version.hpp"
65 #include "services/attachListener.hpp"
66 #include "services/management.hpp"
67 #include "services/threadService.hpp"
68 #include "trace/tracing.hpp"
69 #include "utilities/copy.hpp"
70 #include "utilities/defaultStream.hpp"
71 #include "utilities/dtrace.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/histogram.hpp"
74 #include "utilities/macros.hpp"
75 #include "utilities/top.hpp"
76 #include "utilities/utf8.hpp"
77 #if INCLUDE_CDS
78 #include "classfile/sharedClassUtil.hpp"
79 #include "classfile/systemDictionaryShared.hpp"
80 #endif
81 #ifdef TARGET_OS_FAMILY_linux
82 # include "jvm_linux.h"
83 #endif
84 #ifdef TARGET_OS_FAMILY_solaris
85 # include "jvm_solaris.h"
86 #endif
87 #ifdef TARGET_OS_FAMILY_windows
88 # include "jvm_windows.h"
89 #endif
90 #ifdef TARGET_OS_FAMILY_aix
91 # include "jvm_aix.h"
92 #endif
93 #ifdef TARGET_OS_FAMILY_bsd
94 # include "jvm_bsd.h"
95 #endif
96
97 #include <errno.h>
98
99 /*
100 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
101 such ctors and calls MUST NOT come between an oop declaration/init and its
102 usage because if objects are move this may cause various memory stomps, bus
103 errors and segfaults. Here is a cookbook for causing so called "naked oop
104 failures":
105
106 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
107 JVMWrapper("JVM_GetClassDeclaredFields");
108
109 // Object address to be held directly in mirror & not visible to GC
110 oop mirror = JNIHandles::resolve_non_null(ofClass);
111
112 // If this ctor can hit a safepoint, moving objects around, then
113 ComplexConstructor foo;
114
115 // Boom! mirror may point to JUNK instead of the intended object
116 (some dereference of mirror)
117
118 // Here's another call that may block for GC, making mirror stale
119 MutexLocker ml(some_lock);
120
121 // And here's an initializer that can result in a stale oop
122 // all in one step.
123 oop o = call_that_can_throw_exception(TRAPS);
124
125
126 The solution is to keep the oop declaration BELOW the ctor or function
127 call that might cause a GC, do another resolve to reassign the oop, or
128 consider use of a Handle instead of an oop so there is immunity from object
129 motion. But note that the "QUICK" entries below do not have a handlemark
130 and thus can only support use of handles passed in.
131 */
132
133 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
134 ResourceMark rm;
135 int line_number = -1;
136 const char * source_file = NULL;
137 const char * trace = "explicit";
138 InstanceKlass* caller = NULL;
139 JavaThread* jthread = JavaThread::current();
140 if (jthread->has_last_Java_frame()) {
141 vframeStream vfst(jthread);
142
143 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
144 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
145 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
146 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
147 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
148
149 Method* last_caller = NULL;
150
151 while (!vfst.at_end()) {
152 Method* m = vfst.method();
153 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
154 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
155 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
156 break;
157 }
158 last_caller = m;
159 vfst.next();
160 }
161 // if this is called from Class.forName0 and that is called from Class.forName,
162 // then print the caller of Class.forName. If this is Class.loadClass, then print
163 // that caller, otherwise keep quiet since this should be picked up elsewhere.
164 bool found_it = false;
165 if (!vfst.at_end() &&
166 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
167 vfst.method()->name() == vmSymbols::forName0_name()) {
168 vfst.next();
169 if (!vfst.at_end() &&
170 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
171 vfst.method()->name() == vmSymbols::forName_name()) {
172 vfst.next();
173 found_it = true;
174 }
175 } else if (last_caller != NULL &&
176 last_caller->method_holder()->name() ==
177 vmSymbols::java_lang_ClassLoader() &&
178 (last_caller->name() == vmSymbols::loadClassInternal_name() ||
179 last_caller->name() == vmSymbols::loadClass_name())) {
180 found_it = true;
181 } else if (!vfst.at_end()) {
182 if (vfst.method()->is_native()) {
183 // JNI call
184 found_it = true;
185 }
186 }
187 if (found_it && !vfst.at_end()) {
188 // found the caller
189 caller = vfst.method()->method_holder();
190 line_number = vfst.method()->line_number_from_bci(vfst.bci());
191 if (line_number == -1) {
192 // show method name if it's a native method
193 trace = vfst.method()->name_and_sig_as_C_string();
194 }
195 Symbol* s = caller->source_file_name();
196 if (s != NULL) {
197 source_file = s->as_C_string();
198 }
199 }
200 }
201 if (caller != NULL) {
202 if (to_class != caller) {
203 const char * from = caller->external_name();
204 const char * to = to_class->external_name();
205 // print in a single call to reduce interleaving between threads
206 if (source_file != NULL) {
207 tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace);
208 } else {
209 tty->print("RESOLVE %s %s (%s)\n", from, to, trace);
210 }
211 }
212 }
213 }
214
215 void trace_class_resolution(Klass* to_class) {
216 EXCEPTION_MARK;
217 trace_class_resolution_impl(to_class, THREAD);
218 if (HAS_PENDING_EXCEPTION) {
219 CLEAR_PENDING_EXCEPTION;
220 }
221 }
222
223 // Wrapper to trace JVM functions
224
225 #ifdef ASSERT
226 class JVMTraceWrapper : public StackObj {
227 public:
228 JVMTraceWrapper(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) {
229 if (TraceJVMCalls) {
230 va_list ap;
231 va_start(ap, format);
232 tty->print("JVM ");
233 tty->vprint_cr(format, ap);
234 va_end(ap);
235 }
236 }
237 };
238
239 Histogram* JVMHistogram;
240 volatile jint JVMHistogram_lock = 0;
241
242 class JVMHistogramElement : public HistogramElement {
243 public:
244 JVMHistogramElement(const char* name);
245 };
246
247 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
248 _name = elementName;
249 uintx count = 0;
250
251 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
252 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
253 count +=1;
254 if ( (WarnOnStalledSpinLock > 0)
255 && (count % WarnOnStalledSpinLock == 0)) {
256 warning("JVMHistogram_lock seems to be stalled");
257 }
258 }
259 }
260
261 if(JVMHistogram == NULL)
262 JVMHistogram = new Histogram("JVM Call Counts",100);
263
264 JVMHistogram->add_element(this);
265 Atomic::dec(&JVMHistogram_lock);
266 }
267
268 #define JVMCountWrapper(arg) \
269 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
270 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
271
272 #define JVMWrapper(arg1) JVMCountWrapper(arg1); JVMTraceWrapper(arg1)
273 #define JVMWrapper2(arg1, arg2) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2)
274 #define JVMWrapper3(arg1, arg2, arg3) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3)
275 #define JVMWrapper4(arg1, arg2, arg3, arg4) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3, arg4)
276 #else
277 #define JVMWrapper(arg1)
278 #define JVMWrapper2(arg1, arg2)
279 #define JVMWrapper3(arg1, arg2, arg3)
280 #define JVMWrapper4(arg1, arg2, arg3, arg4)
281 #endif
282
283
284 // Interface version /////////////////////////////////////////////////////////////////////
285
286
287 JVM_LEAF(jint, JVM_GetInterfaceVersion())
288 return JVM_INTERFACE_VERSION;
289 JVM_END
290
291
292 // java.lang.System //////////////////////////////////////////////////////////////////////
293
294
295 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
296 JVMWrapper("JVM_CurrentTimeMillis");
297 return os::javaTimeMillis();
298 JVM_END
299
300 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
301 JVMWrapper("JVM_NanoTime");
302 return os::javaTimeNanos();
303 JVM_END
304
305 // The function below is actually exposed by sun.misc.VM and not
306 // java.lang.System, but we choose to keep it here so that it stays next
307 // to JVM_CurrentTimeMillis and JVM_NanoTime
308
309 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
310 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
311
312 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
313 JVMWrapper("JVM_GetNanoTimeAdjustment");
314 jlong seconds;
315 jlong nanos;
316
317 os::javaTimeSystemUTC(seconds, nanos);
318
319 // We're going to verify that the result can fit in a long.
320 // For that we need the difference in seconds between 'seconds'
321 // and 'offset_secs' to be such that:
322 // |seconds - offset_secs| < (2^63/10^9)
323 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
324 // which makes |seconds - offset_secs| < 2^33
325 // and we will prefer +/- 2^32 as the maximum acceptable diff
326 // as 2^32 has a more natural feel than 2^33...
327 //
328 // So if |seconds - offset_secs| >= 2^32 - we return a special
329 // sentinel value (-1) which the caller should take as an
330 // exception value indicating that the offset given to us is
331 // too far from range of the current time - leading to too big
332 // a nano adjustment. The caller is expected to recover by
333 // computing a more accurate offset and calling this method
334 // again. (For the record 2^32 secs is ~136 years, so that
335 // should rarely happen)
336 //
337 jlong diff = seconds - offset_secs;
338 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
339 return -1; // sentinel value: the offset is too far off the target
340 }
341
342 // return the adjustment. If you compute a time by adding
343 // this number of nanoseconds along with the number of seconds
344 // in the offset you should get the current UTC time.
345 return (diff * (jlong)1000000000) + nanos;
346 JVM_END
347
348 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
349 jobject dst, jint dst_pos, jint length))
350 JVMWrapper("JVM_ArrayCopy");
351 // Check if we have null pointers
352 if (src == NULL || dst == NULL) {
353 THROW(vmSymbols::java_lang_NullPointerException());
354 }
355 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
356 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
357 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop");
358 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop");
359 // Do copy
360 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
361 JVM_END
362
363
364 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
365 JavaValue r(T_OBJECT);
366 // public synchronized Object put(Object key, Object value);
367 HandleMark hm(THREAD);
368 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
369 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
370 JavaCalls::call_virtual(&r,
371 props,
372 KlassHandle(THREAD, SystemDictionary::Properties_klass()),
373 vmSymbols::put_name(),
374 vmSymbols::object_object_object_signature(),
375 key_str,
376 value_str,
377 THREAD);
378 }
379
380
381 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
382
383
384 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
385 JVMWrapper("JVM_InitProperties");
386 ResourceMark rm;
387
388 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
389
390 // System property list includes both user set via -D option and
391 // jvm system specific properties.
392 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
393 PUTPROP(props, p->key(), p->value());
394 }
395
396 // Convert the -XX:MaxDirectMemorySize= command line flag
397 // to the sun.nio.MaxDirectMemorySize property.
398 // Do this after setting user properties to prevent people
399 // from setting the value with a -D option, as requested.
400 {
401 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
402 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
403 } else {
404 char as_chars[256];
405 jio_snprintf(as_chars, sizeof(as_chars), SIZE_FORMAT, MaxDirectMemorySize);
406 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
407 }
408 }
409
410 // JVM monitoring and management support
411 // Add the sun.management.compiler property for the compiler's name
412 {
413 #undef CSIZE
414 #if defined(_LP64) || defined(_WIN64)
415 #define CSIZE "64-Bit "
416 #else
417 #define CSIZE
418 #endif // 64bit
419
420 #ifdef TIERED
421 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
422 #else
423 #if defined(COMPILER1)
424 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
425 #elif defined(COMPILER2)
426 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
427 #elif INCLUDE_JVMCI
428 #error "INCLUDE_JVMCI should imply TIERED"
429 #else
430 const char* compiler_name = "";
431 #endif // compilers
432 #endif // TIERED
433
434 if (*compiler_name != '\0' &&
435 (Arguments::mode() != Arguments::_int)) {
436 PUTPROP(props, "sun.management.compiler", compiler_name);
437 }
438 }
439
440 return properties;
441 JVM_END
442
443
444 /*
445 * Return the temporary directory that the VM uses for the attach
446 * and perf data files.
447 *
448 * It is important that this directory is well-known and the
449 * same for all VM instances. It cannot be affected by configuration
450 * variables such as java.io.tmpdir.
451 */
452 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
453 JVMWrapper("JVM_GetTemporaryDirectory");
454 HandleMark hm(THREAD);
455 const char* temp_dir = os::get_temp_directory();
456 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
457 return (jstring) JNIHandles::make_local(env, h());
458 JVM_END
459
460
461 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
462
463 extern volatile jint vm_created;
464
465 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
466 before_exit(thread);
467 vm_exit(code);
468 JVM_END
469
470
471 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
472 JVMWrapper("JVM_GC");
473 if (!DisableExplicitGC) {
474 Universe::heap()->collect(GCCause::_java_lang_system_gc);
475 }
476 JVM_END
477
478
479 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
480 JVMWrapper("JVM_MaxObjectInspectionAge");
481 return Universe::heap()->millis_since_last_gc();
482 JVM_END
483
484
485 static inline jlong convert_size_t_to_jlong(size_t val) {
486 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
487 NOT_LP64 (return (jlong)val;)
488 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
489 }
490
491 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
492 JVMWrapper("JVM_TotalMemory");
493 size_t n = Universe::heap()->capacity();
494 return convert_size_t_to_jlong(n);
495 JVM_END
496
497
498 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
499 JVMWrapper("JVM_FreeMemory");
500 CollectedHeap* ch = Universe::heap();
501 size_t n;
502 {
503 MutexLocker x(Heap_lock);
504 n = ch->capacity() - ch->used();
505 }
506 return convert_size_t_to_jlong(n);
507 JVM_END
508
509
510 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
511 JVMWrapper("JVM_MaxMemory");
512 size_t n = Universe::heap()->max_capacity();
513 return convert_size_t_to_jlong(n);
514 JVM_END
515
516
517 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
518 JVMWrapper("JVM_ActiveProcessorCount");
519 return os::active_processor_count();
520 JVM_END
521
522
523
524 // java.lang.Throwable //////////////////////////////////////////////////////
525
526
527 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
528 JVMWrapper("JVM_FillInStackTrace");
529 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
530 java_lang_Throwable::fill_in_stack_trace(exception);
531 JVM_END
532
533
534 JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable))
535 JVMWrapper("JVM_GetStackTraceDepth");
536 oop exception = JNIHandles::resolve(throwable);
537 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD);
538 JVM_END
539
540
541 JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index))
542 JVMWrapper("JVM_GetStackTraceElement");
543 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC
544 oop exception = JNIHandles::resolve(throwable);
545 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL);
546 return JNIHandles::make_local(env, element);
547 JVM_END
548
549
550 // java.lang.Object ///////////////////////////////////////////////
551
552
553 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
554 JVMWrapper("JVM_IHashCode");
555 // as implemented in the classic virtual machine; return 0 if object is NULL
556 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
557 JVM_END
558
559
560 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
561 JVMWrapper("JVM_MonitorWait");
562 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
563 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
564 if (JvmtiExport::should_post_monitor_wait()) {
565 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
566
567 // The current thread already owns the monitor and it has not yet
568 // been added to the wait queue so the current thread cannot be
569 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
570 // event handler cannot accidentally consume an unpark() meant for
571 // the ParkEvent associated with this ObjectMonitor.
572 }
573 ObjectSynchronizer::wait(obj, ms, CHECK);
574 JVM_END
575
576
577 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
578 JVMWrapper("JVM_MonitorNotify");
579 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
580 ObjectSynchronizer::notify(obj, CHECK);
581 JVM_END
582
583
584 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
585 JVMWrapper("JVM_MonitorNotifyAll");
586 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
587 ObjectSynchronizer::notifyall(obj, CHECK);
588 JVM_END
589
590
591 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
592 JVMWrapper("JVM_Clone");
593 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
594 const KlassHandle klass (THREAD, obj->klass());
595 JvmtiVMObjectAllocEventCollector oam;
596
597 #ifdef ASSERT
598 // Just checking that the cloneable flag is set correct
599 if (obj->is_array()) {
600 guarantee(klass->is_cloneable(), "all arrays are cloneable");
601 } else {
602 guarantee(obj->is_instance(), "should be instanceOop");
603 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
604 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
605 }
606 #endif
607
608 // Check if class of obj supports the Cloneable interface.
609 // All arrays are considered to be cloneable (See JLS 20.1.5)
610 if (!klass->is_cloneable()) {
611 ResourceMark rm(THREAD);
612 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
613 }
614
615 // Make shallow object copy
616 const int size = obj->size();
617 oop new_obj_oop = NULL;
618 if (obj->is_array()) {
619 const int length = ((arrayOop)obj())->length();
620 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
621 } else {
622 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
623 }
624
625 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
626 // is modifying a reference field in the clonee, a non-oop-atomic copy might
627 // be suspended in the middle of copying the pointer and end up with parts
628 // of two different pointers in the field. Subsequent dereferences will crash.
629 // 4846409: an oop-copy of objects with long or double fields or arrays of same
630 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
631 // of oops. We know objects are aligned on a minimum of an jlong boundary.
632 // The same is true of StubRoutines::object_copy and the various oop_copy
633 // variants, and of the code generated by the inline_native_clone intrinsic.
634 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
635 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop,
636 (size_t)align_object_size(size) / HeapWordsPerLong);
637 // Clear the header
638 new_obj_oop->init_mark();
639
640 // Store check (mark entire object and let gc sort it out)
641 BarrierSet* bs = Universe::heap()->barrier_set();
642 assert(bs->has_write_region_opt(), "Barrier set does not have write_region");
643 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size));
644
645 Handle new_obj(THREAD, new_obj_oop);
646 // Special handling for MemberNames. Since they contain Method* metadata, they
647 // must be registered so that RedefineClasses can fix metadata contained in them.
648 if (java_lang_invoke_MemberName::is_instance(new_obj()) &&
649 java_lang_invoke_MemberName::is_method(new_obj())) {
650 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj());
651 // MemberName may be unresolved, so doesn't need registration until resolved.
652 if (method != NULL) {
653 methodHandle m(THREAD, method);
654 // This can safepoint and redefine method, so need both new_obj and method
655 // in a handle, for two different reasons. new_obj can move, method can be
656 // deleted if nothing is using it on the stack.
657 m->method_holder()->add_member_name(new_obj());
658 }
659 }
660
661 // Caution: this involves a java upcall, so the clone should be
662 // "gc-robust" by this stage.
663 if (klass->has_finalizer()) {
664 assert(obj->is_instance(), "should be instanceOop");
665 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
666 new_obj = Handle(THREAD, new_obj_oop);
667 }
668
669 return JNIHandles::make_local(env, new_obj());
670 JVM_END
671
672 // java.io.File ///////////////////////////////////////////////////////////////
673
674 JVM_LEAF(char*, JVM_NativePath(char* path))
675 JVMWrapper2("JVM_NativePath (%s)", path);
676 return os::native_path(path);
677 JVM_END
678
679
680 // Misc. class handling ///////////////////////////////////////////////////////////
681
682
683 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
684 JVMWrapper("JVM_GetCallerClass");
685
686 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
687 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
688 // temporarily for existing code to use until a replacement API is defined.
689 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
690 Klass* k = thread->security_get_caller_class(depth);
691 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
692 }
693
694 // Getting the class of the caller frame.
695 //
696 // The call stack at this point looks something like this:
697 //
698 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
699 // [1] [ @CallerSensitive API.method ]
700 // [.] [ (skipped intermediate frames) ]
701 // [n] [ caller ]
702 vframeStream vfst(thread);
703 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
704 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
705 Method* m = vfst.method();
706 assert(m != NULL, "sanity");
707 switch (n) {
708 case 0:
709 // This must only be called from Reflection.getCallerClass
710 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
711 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
712 }
713 // fall-through
714 case 1:
715 // Frame 0 and 1 must be caller sensitive.
716 if (!m->caller_sensitive()) {
717 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
718 }
719 break;
720 default:
721 if (!m->is_ignored_by_security_stack_walk()) {
722 // We have reached the desired frame; return the holder class.
723 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
724 }
725 break;
726 }
727 }
728 return NULL;
729 JVM_END
730
731
732 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
733 JVMWrapper("JVM_FindPrimitiveClass");
734 oop mirror = NULL;
735 BasicType t = name2type(utf);
736 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
737 mirror = Universe::java_mirror(t);
738 }
739 if (mirror == NULL) {
740 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
741 } else {
742 return (jclass) JNIHandles::make_local(env, mirror);
743 }
744 JVM_END
745
746
747 // Returns a class loaded by the bootstrap class loader; or null
748 // if not found. ClassNotFoundException is not thrown.
749 // FindClassFromBootLoader is exported to the launcher for windows.
750 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
751 const char* name))
752 JVMWrapper2("JVM_FindClassFromBootLoader %s", name);
753
754 // Java libraries should ensure that name is never null...
755 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
756 // It's impossible to create this class; the name cannot fit
757 // into the constant pool.
758 return NULL;
759 }
760
761 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
762 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
763 if (k == NULL) {
764 return NULL;
765 }
766
767 if (TraceClassResolution) {
768 trace_class_resolution(k);
769 }
770 return (jclass) JNIHandles::make_local(env, k->java_mirror());
771 JVM_END
772
773 // Find a class with this name in this loader, using the caller's protection domain.
774 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
775 jboolean init, jobject loader,
776 jclass caller))
777 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name);
778 // Java libraries should ensure that name is never null...
779 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
780 // It's impossible to create this class; the name cannot fit
781 // into the constant pool.
782 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
783 }
784
785 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
786
787 oop loader_oop = JNIHandles::resolve(loader);
788 oop from_class = JNIHandles::resolve(caller);
789 oop protection_domain = NULL;
790 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
791 // NPE. Put it in another way, the bootstrap class loader has all permission and
792 // thus no checkPackageAccess equivalence in the VM class loader.
793 // The caller is also passed as NULL by the java code if there is no security
794 // manager to avoid the performance cost of getting the calling class.
795 if (from_class != NULL && loader_oop != NULL) {
796 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
797 }
798
799 Handle h_loader(THREAD, loader_oop);
800 Handle h_prot(THREAD, protection_domain);
801 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
802 h_prot, false, THREAD);
803
804 if (TraceClassResolution && result != NULL) {
805 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
806 }
807 return result;
808 JVM_END
809
810 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
811 jboolean init, jclass from))
812 JVMWrapper2("JVM_FindClassFromClass %s", name);
813 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
814 // It's impossible to create this class; the name cannot fit
815 // into the constant pool.
816 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
817 }
818 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
819 oop from_class_oop = JNIHandles::resolve(from);
820 Klass* from_class = (from_class_oop == NULL)
821 ? (Klass*)NULL
822 : java_lang_Class::as_Klass(from_class_oop);
823 oop class_loader = NULL;
824 oop protection_domain = NULL;
825 if (from_class != NULL) {
826 class_loader = from_class->class_loader();
827 protection_domain = from_class->protection_domain();
828 }
829 Handle h_loader(THREAD, class_loader);
830 Handle h_prot (THREAD, protection_domain);
831 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
832 h_prot, true, thread);
833
834 if (TraceClassResolution && result != NULL) {
835 // this function is generally only used for class loading during verification.
836 ResourceMark rm;
837 oop from_mirror = JNIHandles::resolve_non_null(from);
838 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
839 const char * from_name = from_class->external_name();
840
841 oop mirror = JNIHandles::resolve_non_null(result);
842 Klass* to_class = java_lang_Class::as_Klass(mirror);
843 const char * to = to_class->external_name();
844 tty->print("RESOLVE %s %s (verification)\n", from_name, to);
845 }
846
847 return result;
848 JVM_END
849
850 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
851 if (loader.is_null()) {
852 return;
853 }
854
855 // check whether the current caller thread holds the lock or not.
856 // If not, increment the corresponding counter
857 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
858 ObjectSynchronizer::owner_self) {
859 counter->inc();
860 }
861 }
862
863 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
864 // and JVM_DefineClassWithSourceCond()
865 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
866 jobject loader, const jbyte *buf,
867 jsize len, jobject pd, const char *source,
868 jboolean verify, TRAPS) {
869 if (source == NULL) source = "__JVM_DefineClass__";
870
871 assert(THREAD->is_Java_thread(), "must be a JavaThread");
872 JavaThread* jt = (JavaThread*) THREAD;
873
874 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
875 ClassLoader::perf_define_appclass_selftime(),
876 ClassLoader::perf_define_appclasses(),
877 jt->get_thread_stat()->perf_recursion_counts_addr(),
878 jt->get_thread_stat()->perf_timers_addr(),
879 PerfClassTraceTime::DEFINE_CLASS);
880
881 if (UsePerfData) {
882 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
883 }
884
885 // Since exceptions can be thrown, class initialization can take place
886 // if name is NULL no check for class name in .class stream has to be made.
887 TempNewSymbol class_name = NULL;
888 if (name != NULL) {
889 const int str_len = (int)strlen(name);
890 if (str_len > Symbol::max_length()) {
891 // It's impossible to create this class; the name cannot fit
892 // into the constant pool.
893 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
894 }
895 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
896 }
897
898 ResourceMark rm(THREAD);
899 ClassFileStream st((u1*) buf, len, (char *)source);
900 Handle class_loader (THREAD, JNIHandles::resolve(loader));
901 if (UsePerfData) {
902 is_lock_held_by_thread(class_loader,
903 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
904 THREAD);
905 }
906 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
907 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader,
908 protection_domain, &st,
909 verify != 0,
910 CHECK_NULL);
911
912 if (TraceClassResolution && k != NULL) {
913 trace_class_resolution(k);
914 }
915
916 return (jclass) JNIHandles::make_local(env, k->java_mirror());
917 }
918
919
920 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
921 JVMWrapper2("JVM_DefineClass %s", name);
922
923 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD);
924 JVM_END
925
926
927 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
928 JVMWrapper2("JVM_DefineClassWithSource %s", name);
929
930 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD);
931 JVM_END
932
933 JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name,
934 jobject loader, const jbyte *buf,
935 jsize len, jobject pd,
936 const char *source, jboolean verify))
937 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name);
938
939 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD);
940 JVM_END
941
942 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
943 JVMWrapper("JVM_FindLoadedClass");
944 ResourceMark rm(THREAD);
945
946 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
947 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
948
949 const char* str = java_lang_String::as_utf8_string(string());
950 // Sanity check, don't expect null
951 if (str == NULL) return NULL;
952
953 const int str_len = (int)strlen(str);
954 if (str_len > Symbol::max_length()) {
955 // It's impossible to create this class; the name cannot fit
956 // into the constant pool.
957 return NULL;
958 }
959 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
960
961 // Security Note:
962 // The Java level wrapper will perform the necessary security check allowing
963 // us to pass the NULL as the initiating class loader.
964 Handle h_loader(THREAD, JNIHandles::resolve(loader));
965 if (UsePerfData) {
966 is_lock_held_by_thread(h_loader,
967 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
968 THREAD);
969 }
970
971 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
972 h_loader,
973 Handle(),
974 CHECK_NULL);
975 #if INCLUDE_CDS
976 if (k == NULL) {
977 // If the class is not already loaded, try to see if it's in the shared
978 // archive for the current classloader (h_loader).
979 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
980 klass_name, h_loader, CHECK_NULL);
981 k = ik();
982 }
983 #endif
984 return (k == NULL) ? NULL :
985 (jclass) JNIHandles::make_local(env, k->java_mirror());
986 JVM_END
987
988
989 // Reflection support //////////////////////////////////////////////////////////////////////////////
990
991 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
992 assert (cls != NULL, "illegal class");
993 JVMWrapper("JVM_GetClassName");
994 JvmtiVMObjectAllocEventCollector oam;
995 ResourceMark rm(THREAD);
996 const char* name;
997 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
998 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
999 } else {
1000 // Consider caching interned string in Klass
1001 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1002 assert(k->is_klass(), "just checking");
1003 name = k->external_name();
1004 }
1005 oop result = StringTable::intern((char*) name, CHECK_NULL);
1006 return (jstring) JNIHandles::make_local(env, result);
1007 JVM_END
1008
1009
1010 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1011 JVMWrapper("JVM_GetClassInterfaces");
1012 JvmtiVMObjectAllocEventCollector oam;
1013 oop mirror = JNIHandles::resolve_non_null(cls);
1014
1015 // Special handling for primitive objects
1016 if (java_lang_Class::is_primitive(mirror)) {
1017 // Primitive objects does not have any interfaces
1018 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1019 return (jobjectArray) JNIHandles::make_local(env, r);
1020 }
1021
1022 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
1023 // Figure size of result array
1024 int size;
1025 if (klass->oop_is_instance()) {
1026 size = InstanceKlass::cast(klass())->local_interfaces()->length();
1027 } else {
1028 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass");
1029 size = 2;
1030 }
1031
1032 // Allocate result array
1033 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1034 objArrayHandle result (THREAD, r);
1035 // Fill in result
1036 if (klass->oop_is_instance()) {
1037 // Regular instance klass, fill in all local interfaces
1038 for (int index = 0; index < size; index++) {
1039 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
1040 result->obj_at_put(index, k->java_mirror());
1041 }
1042 } else {
1043 // All arrays implement java.lang.Cloneable and java.io.Serializable
1044 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1045 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1046 }
1047 return (jobjectArray) JNIHandles::make_local(env, result());
1048 JVM_END
1049
1050
1051 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1052 JVMWrapper("JVM_IsInterface");
1053 oop mirror = JNIHandles::resolve_non_null(cls);
1054 if (java_lang_Class::is_primitive(mirror)) {
1055 return JNI_FALSE;
1056 }
1057 Klass* k = java_lang_Class::as_Klass(mirror);
1058 jboolean result = k->is_interface();
1059 assert(!result || k->oop_is_instance(),
1060 "all interfaces are instance types");
1061 // The compiler intrinsic for isInterface tests the
1062 // Klass::_access_flags bits in the same way.
1063 return result;
1064 JVM_END
1065
1066
1067 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1068 JVMWrapper("JVM_GetClassSigners");
1069 JvmtiVMObjectAllocEventCollector oam;
1070 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1071 // There are no signers for primitive types
1072 return NULL;
1073 }
1074
1075 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1076
1077 // If there are no signers set in the class, or if the class
1078 // is an array, return NULL.
1079 if (signers == NULL) return NULL;
1080
1081 // copy of the signers array
1082 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1083 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1084 for (int index = 0; index < signers->length(); index++) {
1085 signers_copy->obj_at_put(index, signers->obj_at(index));
1086 }
1087
1088 // return the copy
1089 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1090 JVM_END
1091
1092
1093 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1094 JVMWrapper("JVM_SetClassSigners");
1095 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1096 // This call is ignored for primitive types and arrays.
1097 // Signers are only set once, ClassLoader.java, and thus shouldn't
1098 // be called with an array. Only the bootstrap loader creates arrays.
1099 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1100 if (k->oop_is_instance()) {
1101 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1102 }
1103 }
1104 JVM_END
1105
1106
1107 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1108 JVMWrapper("JVM_GetProtectionDomain");
1109 if (JNIHandles::resolve(cls) == NULL) {
1110 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1111 }
1112
1113 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1114 // Primitive types does not have a protection domain.
1115 return NULL;
1116 }
1117
1118 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1119 return (jobject) JNIHandles::make_local(env, pd);
1120 JVM_END
1121
1122
1123 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1124 // If there is a security manager and protection domain, check the access
1125 // in the protection domain, otherwise it is authorized.
1126 if (java_lang_System::has_security_manager()) {
1127
1128 // For bootstrapping, if pd implies method isn't in the JDK, allow
1129 // this context to revert to older behavior.
1130 // In this case the isAuthorized field in AccessControlContext is also not
1131 // present.
1132 if (Universe::protection_domain_implies_method() == NULL) {
1133 return true;
1134 }
1135
1136 // Whitelist certain access control contexts
1137 if (java_security_AccessControlContext::is_authorized(context)) {
1138 return true;
1139 }
1140
1141 oop prot = klass->protection_domain();
1142 if (prot != NULL) {
1143 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1144 // in the new wrapper.
1145 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1146 Handle h_prot(THREAD, prot);
1147 JavaValue result(T_BOOLEAN);
1148 JavaCallArguments args(h_prot);
1149 JavaCalls::call(&result, m, &args, CHECK_false);
1150 return (result.get_jboolean() != 0);
1151 }
1152 }
1153 return true;
1154 }
1155
1156 // Create an AccessControlContext with a protection domain with null codesource
1157 // and null permissions - which gives no permissions.
1158 oop create_dummy_access_control_context(TRAPS) {
1159 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass());
1160 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1161 // Call constructor ProtectionDomain(null, null);
1162 JavaValue result(T_VOID);
1163 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1164 vmSymbols::object_initializer_name(),
1165 vmSymbols::codesource_permissioncollection_signature(),
1166 Handle(), Handle(), CHECK_NULL);
1167
1168 // new ProtectionDomain[] {pd};
1169 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1170 context->obj_at_put(0, obj());
1171
1172 // new AccessControlContext(new ProtectionDomain[] {pd})
1173 objArrayHandle h_context(THREAD, context);
1174 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1175 return acc;
1176 }
1177
1178 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1179 JVMWrapper("JVM_DoPrivileged");
1180
1181 if (action == NULL) {
1182 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1183 }
1184
1185 // Compute the frame initiating the do privileged operation and setup the privileged stack
1186 vframeStream vfst(thread);
1187 vfst.security_get_caller_frame(1);
1188
1189 if (vfst.at_end()) {
1190 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1191 }
1192
1193 Method* method = vfst.method();
1194 instanceKlassHandle klass (THREAD, method->method_holder());
1195
1196 // Check that action object understands "Object run()"
1197 Handle h_context;
1198 if (context != NULL) {
1199 h_context = Handle(THREAD, JNIHandles::resolve(context));
1200 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1201 if (!authorized) {
1202 // Create an unprivileged access control object and call it's run function
1203 // instead.
1204 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1205 h_context = Handle(THREAD, noprivs);
1206 }
1207 }
1208
1209 // Check that action object understands "Object run()"
1210 Handle object (THREAD, JNIHandles::resolve(action));
1211
1212 // get run() method
1213 Method* m_oop = object->klass()->uncached_lookup_method(
1214 vmSymbols::run_method_name(),
1215 vmSymbols::void_object_signature(),
1216 Klass::find_overpass);
1217 methodHandle m (THREAD, m_oop);
1218 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1219 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1220 }
1221
1222 // Stack allocated list of privileged stack elements
1223 PrivilegedElement pi;
1224 if (!vfst.at_end()) {
1225 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1226 thread->set_privileged_stack_top(&pi);
1227 }
1228
1229
1230 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1231 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1232 Handle pending_exception;
1233 JavaValue result(T_OBJECT);
1234 JavaCallArguments args(object);
1235 JavaCalls::call(&result, m, &args, THREAD);
1236
1237 // done with action, remove ourselves from the list
1238 if (!vfst.at_end()) {
1239 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1240 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1241 }
1242
1243 if (HAS_PENDING_EXCEPTION) {
1244 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1245 CLEAR_PENDING_EXCEPTION;
1246 // JVMTI has already reported the pending exception
1247 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1248 if (THREAD->is_Java_thread()) {
1249 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1250 }
1251 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1252 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1253 // Throw a java.security.PrivilegedActionException(Exception e) exception
1254 JavaCallArguments args(pending_exception);
1255 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1256 vmSymbols::exception_void_signature(),
1257 &args);
1258 }
1259 }
1260
1261 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1262 return JNIHandles::make_local(env, (oop) result.get_jobject());
1263 JVM_END
1264
1265
1266 // Returns the inherited_access_control_context field of the running thread.
1267 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1268 JVMWrapper("JVM_GetInheritedAccessControlContext");
1269 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1270 return JNIHandles::make_local(env, result);
1271 JVM_END
1272
1273 class RegisterArrayForGC {
1274 private:
1275 JavaThread *_thread;
1276 public:
1277 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1278 _thread = thread;
1279 _thread->register_array_for_gc(array);
1280 }
1281
1282 ~RegisterArrayForGC() {
1283 _thread->register_array_for_gc(NULL);
1284 }
1285 };
1286
1287
1288 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1289 JVMWrapper("JVM_GetStackAccessControlContext");
1290 if (!UsePrivilegedStack) return NULL;
1291
1292 ResourceMark rm(THREAD);
1293 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1294 JvmtiVMObjectAllocEventCollector oam;
1295
1296 // count the protection domains on the execution stack. We collapse
1297 // duplicate consecutive protection domains into a single one, as
1298 // well as stopping when we hit a privileged frame.
1299
1300 // Use vframeStream to iterate through Java frames
1301 vframeStream vfst(thread);
1302
1303 oop previous_protection_domain = NULL;
1304 Handle privileged_context(thread, NULL);
1305 bool is_privileged = false;
1306 oop protection_domain = NULL;
1307
1308 for(; !vfst.at_end(); vfst.next()) {
1309 // get method of frame
1310 Method* method = vfst.method();
1311 intptr_t* frame_id = vfst.frame_id();
1312
1313 // check the privileged frames to see if we have a match
1314 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1315 // this frame is privileged
1316 is_privileged = true;
1317 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1318 protection_domain = thread->privileged_stack_top()->protection_domain();
1319 } else {
1320 protection_domain = method->method_holder()->protection_domain();
1321 }
1322
1323 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1324 local_array->push(protection_domain);
1325 previous_protection_domain = protection_domain;
1326 }
1327
1328 if (is_privileged) break;
1329 }
1330
1331
1332 // either all the domains on the stack were system domains, or
1333 // we had a privileged system domain
1334 if (local_array->is_empty()) {
1335 if (is_privileged && privileged_context.is_null()) return NULL;
1336
1337 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1338 return JNIHandles::make_local(env, result);
1339 }
1340
1341 // the resource area must be registered in case of a gc
1342 RegisterArrayForGC ragc(thread, local_array);
1343 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1344 local_array->length(), CHECK_NULL);
1345 objArrayHandle h_context(thread, context);
1346 for (int index = 0; index < local_array->length(); index++) {
1347 h_context->obj_at_put(index, local_array->at(index));
1348 }
1349
1350 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1351
1352 return JNIHandles::make_local(env, result);
1353 JVM_END
1354
1355
1356 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1357 JVMWrapper("JVM_IsArrayClass");
1358 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1359 return (k != NULL) && k->oop_is_array() ? true : false;
1360 JVM_END
1361
1362
1363 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1364 JVMWrapper("JVM_IsPrimitiveClass");
1365 oop mirror = JNIHandles::resolve_non_null(cls);
1366 return (jboolean) java_lang_Class::is_primitive(mirror);
1367 JVM_END
1368
1369
1370 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1371 JVMWrapper("JVM_GetClassModifiers");
1372 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1373 // Primitive type
1374 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1375 }
1376
1377 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1378 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1379 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1380 return k->modifier_flags();
1381 JVM_END
1382
1383
1384 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1385
1386 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1387 JvmtiVMObjectAllocEventCollector oam;
1388 // ofClass is a reference to a java_lang_Class object. The mirror object
1389 // of an InstanceKlass
1390
1391 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1392 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1393 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1394 return (jobjectArray)JNIHandles::make_local(env, result);
1395 }
1396
1397 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1398 InnerClassesIterator iter(k);
1399
1400 if (iter.length() == 0) {
1401 // Neither an inner nor outer class
1402 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1403 return (jobjectArray)JNIHandles::make_local(env, result);
1404 }
1405
1406 // find inner class info
1407 constantPoolHandle cp(thread, k->constants());
1408 int length = iter.length();
1409
1410 // Allocate temp. result array
1411 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1412 objArrayHandle result (THREAD, r);
1413 int members = 0;
1414
1415 for (; !iter.done(); iter.next()) {
1416 int ioff = iter.inner_class_info_index();
1417 int ooff = iter.outer_class_info_index();
1418
1419 if (ioff != 0 && ooff != 0) {
1420 // Check to see if the name matches the class we're looking for
1421 // before attempting to find the class.
1422 if (cp->klass_name_at_matches(k, ooff)) {
1423 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1424 if (outer_klass == k()) {
1425 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1426 instanceKlassHandle inner_klass (THREAD, ik);
1427
1428 // Throws an exception if outer klass has not declared k as
1429 // an inner klass
1430 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1431
1432 result->obj_at_put(members, inner_klass->java_mirror());
1433 members++;
1434 }
1435 }
1436 }
1437 }
1438
1439 if (members != length) {
1440 // Return array of right length
1441 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1442 for(int i = 0; i < members; i++) {
1443 res->obj_at_put(i, result->obj_at(i));
1444 }
1445 return (jobjectArray)JNIHandles::make_local(env, res);
1446 }
1447
1448 return (jobjectArray)JNIHandles::make_local(env, result());
1449 JVM_END
1450
1451
1452 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1453 {
1454 // ofClass is a reference to a java_lang_Class object.
1455 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1456 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1457 return NULL;
1458 }
1459
1460 bool inner_is_member = false;
1461 Klass* outer_klass
1462 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1463 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1464 if (outer_klass == NULL) return NULL; // already a top-level class
1465 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1466 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1467 }
1468 JVM_END
1469
1470 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1471 {
1472 oop mirror = JNIHandles::resolve_non_null(cls);
1473 if (java_lang_Class::is_primitive(mirror) ||
1474 !java_lang_Class::as_Klass(mirror)->oop_is_instance()) {
1475 return NULL;
1476 }
1477 instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror)));
1478 int ooff = 0, noff = 0;
1479 if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) {
1480 if (noff != 0) {
1481 constantPoolHandle i_cp(thread, k->constants());
1482 Symbol* name = i_cp->symbol_at(noff);
1483 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1484 return (jstring) JNIHandles::make_local(env, str());
1485 }
1486 }
1487 return NULL;
1488 }
1489 JVM_END
1490
1491 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1492 assert (cls != NULL, "illegal class");
1493 JVMWrapper("JVM_GetClassSignature");
1494 JvmtiVMObjectAllocEventCollector oam;
1495 ResourceMark rm(THREAD);
1496 // Return null for arrays and primatives
1497 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1498 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1499 if (k->oop_is_instance()) {
1500 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1501 if (sym == NULL) return NULL;
1502 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1503 return (jstring) JNIHandles::make_local(env, str());
1504 }
1505 }
1506 return NULL;
1507 JVM_END
1508
1509
1510 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1511 assert (cls != NULL, "illegal class");
1512 JVMWrapper("JVM_GetClassAnnotations");
1513
1514 // Return null for arrays and primitives
1515 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1516 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1517 if (k->oop_is_instance()) {
1518 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1519 return (jbyteArray) JNIHandles::make_local(env, a);
1520 }
1521 }
1522 return NULL;
1523 JVM_END
1524
1525
1526 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1527 // some of this code was adapted from from jni_FromReflectedField
1528
1529 oop reflected = JNIHandles::resolve_non_null(field);
1530 oop mirror = java_lang_reflect_Field::clazz(reflected);
1531 Klass* k = java_lang_Class::as_Klass(mirror);
1532 int slot = java_lang_reflect_Field::slot(reflected);
1533 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1534
1535 KlassHandle kh(THREAD, k);
1536 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1537
1538 if (modifiers & JVM_ACC_STATIC) {
1539 // for static fields we only look in the current class
1540 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1541 assert(false, "cannot find static field");
1542 return false;
1543 }
1544 } else {
1545 // for instance fields we start with the current class and work
1546 // our way up through the superclass chain
1547 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1548 assert(false, "cannot find instance field");
1549 return false;
1550 }
1551 }
1552 return true;
1553 }
1554
1555 static Method* jvm_get_method_common(jobject method) {
1556 // some of this code was adapted from from jni_FromReflectedMethod
1557
1558 oop reflected = JNIHandles::resolve_non_null(method);
1559 oop mirror = NULL;
1560 int slot = 0;
1561
1562 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1563 mirror = java_lang_reflect_Constructor::clazz(reflected);
1564 slot = java_lang_reflect_Constructor::slot(reflected);
1565 } else {
1566 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1567 "wrong type");
1568 mirror = java_lang_reflect_Method::clazz(reflected);
1569 slot = java_lang_reflect_Method::slot(reflected);
1570 }
1571 Klass* k = java_lang_Class::as_Klass(mirror);
1572
1573 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1574 assert(m != NULL, "cannot find method");
1575 return m; // caller has to deal with NULL in product mode
1576 }
1577
1578 /* Type use annotations support (JDK 1.8) */
1579
1580 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1581 assert (cls != NULL, "illegal class");
1582 JVMWrapper("JVM_GetClassTypeAnnotations");
1583 ResourceMark rm(THREAD);
1584 // Return null for arrays and primitives
1585 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1586 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1587 if (k->oop_is_instance()) {
1588 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1589 if (type_annotations != NULL) {
1590 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1591 return (jbyteArray) JNIHandles::make_local(env, a);
1592 }
1593 }
1594 }
1595 return NULL;
1596 JVM_END
1597
1598 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1599 assert (method != NULL, "illegal method");
1600 JVMWrapper("JVM_GetMethodTypeAnnotations");
1601
1602 // method is a handle to a java.lang.reflect.Method object
1603 Method* m = jvm_get_method_common(method);
1604 if (m == NULL) {
1605 return NULL;
1606 }
1607
1608 AnnotationArray* type_annotations = m->type_annotations();
1609 if (type_annotations != NULL) {
1610 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1611 return (jbyteArray) JNIHandles::make_local(env, a);
1612 }
1613
1614 return NULL;
1615 JVM_END
1616
1617 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1618 assert (field != NULL, "illegal field");
1619 JVMWrapper("JVM_GetFieldTypeAnnotations");
1620
1621 fieldDescriptor fd;
1622 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1623 if (!gotFd) {
1624 return NULL;
1625 }
1626
1627 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1628 JVM_END
1629
1630 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1631 if (!cp->is_within_bounds(index)) {
1632 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1633 }
1634 }
1635
1636 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1637 {
1638 JVMWrapper("JVM_GetMethodParameters");
1639 // method is a handle to a java.lang.reflect.Method object
1640 Method* method_ptr = jvm_get_method_common(method);
1641 methodHandle mh (THREAD, method_ptr);
1642 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1643 const int num_params = mh->method_parameters_length();
1644
1645 if (num_params < 0) {
1646 // A -1 return value from method_parameters_length means there is no
1647 // parameter data. Return null to indicate this to the reflection
1648 // API.
1649 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1650 return (jobjectArray)NULL;
1651 } else {
1652 // Otherwise, we return something up to reflection, even if it is
1653 // a zero-length array. Why? Because in some cases this can
1654 // trigger a MalformedParametersException.
1655
1656 // make sure all the symbols are properly formatted
1657 for (int i = 0; i < num_params; i++) {
1658 MethodParametersElement* params = mh->method_parameters_start();
1659 int index = params[i].name_cp_index;
1660 bounds_check(mh->constants(), index, CHECK_NULL);
1661
1662 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1663 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1664 "Wrong type at constant pool index");
1665 }
1666
1667 }
1668
1669 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1670 objArrayHandle result (THREAD, result_oop);
1671
1672 for (int i = 0; i < num_params; i++) {
1673 MethodParametersElement* params = mh->method_parameters_start();
1674 // For a 0 index, give a NULL symbol
1675 Symbol* sym = 0 != params[i].name_cp_index ?
1676 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1677 int flags = params[i].flags;
1678 oop param = Reflection::new_parameter(reflected_method, i, sym,
1679 flags, CHECK_NULL);
1680 result->obj_at_put(i, param);
1681 }
1682 return (jobjectArray)JNIHandles::make_local(env, result());
1683 }
1684 }
1685 JVM_END
1686
1687 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1688
1689 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1690 {
1691 JVMWrapper("JVM_GetClassDeclaredFields");
1692 JvmtiVMObjectAllocEventCollector oam;
1693
1694 // Exclude primitive types and array types
1695 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1696 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
1697 // Return empty array
1698 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1699 return (jobjectArray) JNIHandles::make_local(env, res);
1700 }
1701
1702 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1703 constantPoolHandle cp(THREAD, k->constants());
1704
1705 // Ensure class is linked
1706 k->link_class(CHECK_NULL);
1707
1708 // 4496456 We need to filter out java.lang.Throwable.backtrace
1709 bool skip_backtrace = false;
1710
1711 // Allocate result
1712 int num_fields;
1713
1714 if (publicOnly) {
1715 num_fields = 0;
1716 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
1717 if (fs.access_flags().is_public()) ++num_fields;
1718 }
1719 } else {
1720 num_fields = k->java_fields_count();
1721
1722 if (k() == SystemDictionary::Throwable_klass()) {
1723 num_fields--;
1724 skip_backtrace = true;
1725 }
1726 }
1727
1728 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1729 objArrayHandle result (THREAD, r);
1730
1731 int out_idx = 0;
1732 fieldDescriptor fd;
1733 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1734 if (skip_backtrace) {
1735 // 4496456 skip java.lang.Throwable.backtrace
1736 int offset = fs.offset();
1737 if (offset == java_lang_Throwable::get_backtrace_offset()) continue;
1738 }
1739
1740 if (!publicOnly || fs.access_flags().is_public()) {
1741 fd.reinitialize(k(), fs.index());
1742 oop field = Reflection::new_field(&fd, CHECK_NULL);
1743 result->obj_at_put(out_idx, field);
1744 ++out_idx;
1745 }
1746 }
1747 assert(out_idx == num_fields, "just checking");
1748 return (jobjectArray) JNIHandles::make_local(env, result());
1749 }
1750 JVM_END
1751
1752 static bool select_method(methodHandle method, bool want_constructor) {
1753 if (want_constructor) {
1754 return (method->is_initializer() && !method->is_static());
1755 } else {
1756 return (!method->is_initializer() && !method->is_overpass());
1757 }
1758 }
1759
1760 static jobjectArray get_class_declared_methods_helper(
1761 JNIEnv *env,
1762 jclass ofClass, jboolean publicOnly,
1763 bool want_constructor,
1764 Klass* klass, TRAPS) {
1765
1766 JvmtiVMObjectAllocEventCollector oam;
1767
1768 // Exclude primitive types and array types
1769 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1770 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
1771 // Return empty array
1772 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1773 return (jobjectArray) JNIHandles::make_local(env, res);
1774 }
1775
1776 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1777
1778 // Ensure class is linked
1779 k->link_class(CHECK_NULL);
1780
1781 Array<Method*>* methods = k->methods();
1782 int methods_length = methods->length();
1783
1784 // Save original method_idnum in case of redefinition, which can change
1785 // the idnum of obsolete methods. The new method will have the same idnum
1786 // but if we refresh the methods array, the counts will be wrong.
1787 ResourceMark rm(THREAD);
1788 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1789 int num_methods = 0;
1790
1791 for (int i = 0; i < methods_length; i++) {
1792 methodHandle method(THREAD, methods->at(i));
1793 if (select_method(method, want_constructor)) {
1794 if (!publicOnly || method->is_public()) {
1795 idnums->push(method->method_idnum());
1796 ++num_methods;
1797 }
1798 }
1799 }
1800
1801 // Allocate result
1802 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1803 objArrayHandle result (THREAD, r);
1804
1805 // Now just put the methods that we selected above, but go by their idnum
1806 // in case of redefinition. The methods can be redefined at any safepoint,
1807 // so above when allocating the oop array and below when creating reflect
1808 // objects.
1809 for (int i = 0; i < num_methods; i++) {
1810 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1811 if (method.is_null()) {
1812 // Method may have been deleted and seems this API can handle null
1813 // Otherwise should probably put a method that throws NSME
1814 result->obj_at_put(i, NULL);
1815 } else {
1816 oop m;
1817 if (want_constructor) {
1818 m = Reflection::new_constructor(method, CHECK_NULL);
1819 } else {
1820 m = Reflection::new_method(method, false, CHECK_NULL);
1821 }
1822 result->obj_at_put(i, m);
1823 }
1824 }
1825
1826 return (jobjectArray) JNIHandles::make_local(env, result());
1827 }
1828
1829 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1830 {
1831 JVMWrapper("JVM_GetClassDeclaredMethods");
1832 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1833 /*want_constructor*/ false,
1834 SystemDictionary::reflect_Method_klass(), THREAD);
1835 }
1836 JVM_END
1837
1838 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1839 {
1840 JVMWrapper("JVM_GetClassDeclaredConstructors");
1841 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1842 /*want_constructor*/ true,
1843 SystemDictionary::reflect_Constructor_klass(), THREAD);
1844 }
1845 JVM_END
1846
1847 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1848 {
1849 JVMWrapper("JVM_GetClassAccessFlags");
1850 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1851 // Primitive type
1852 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1853 }
1854
1855 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1856 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1857 }
1858 JVM_END
1859
1860
1861 // Constant pool access //////////////////////////////////////////////////////////
1862
1863 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1864 {
1865 JVMWrapper("JVM_GetClassConstantPool");
1866 JvmtiVMObjectAllocEventCollector oam;
1867
1868 // Return null for primitives and arrays
1869 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1870 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1871 if (k->oop_is_instance()) {
1872 instanceKlassHandle k_h(THREAD, k);
1873 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL);
1874 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1875 return JNIHandles::make_local(jcp());
1876 }
1877 }
1878 return NULL;
1879 }
1880 JVM_END
1881
1882
1883 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1884 {
1885 JVMWrapper("JVM_ConstantPoolGetSize");
1886 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1887 return cp->length();
1888 }
1889 JVM_END
1890
1891
1892 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1893 {
1894 JVMWrapper("JVM_ConstantPoolGetClassAt");
1895 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1896 bounds_check(cp, index, CHECK_NULL);
1897 constantTag tag = cp->tag_at(index);
1898 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1899 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1900 }
1901 Klass* k = cp->klass_at(index, CHECK_NULL);
1902 return (jclass) JNIHandles::make_local(k->java_mirror());
1903 }
1904 JVM_END
1905
1906 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1907 {
1908 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1909 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1910 bounds_check(cp, index, CHECK_NULL);
1911 constantTag tag = cp->tag_at(index);
1912 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1913 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1914 }
1915 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1916 if (k == NULL) return NULL;
1917 return (jclass) JNIHandles::make_local(k->java_mirror());
1918 }
1919 JVM_END
1920
1921 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1922 constantTag tag = cp->tag_at(index);
1923 if (!tag.is_method() && !tag.is_interface_method()) {
1924 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1925 }
1926 int klass_ref = cp->uncached_klass_ref_index_at(index);
1927 Klass* k_o;
1928 if (force_resolution) {
1929 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1930 } else {
1931 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1932 if (k_o == NULL) return NULL;
1933 }
1934 instanceKlassHandle k(THREAD, k_o);
1935 Symbol* name = cp->uncached_name_ref_at(index);
1936 Symbol* sig = cp->uncached_signature_ref_at(index);
1937 methodHandle m (THREAD, k->find_method(name, sig));
1938 if (m.is_null()) {
1939 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1940 }
1941 oop method;
1942 if (!m->is_initializer() || m->is_static()) {
1943 method = Reflection::new_method(m, true, CHECK_NULL);
1944 } else {
1945 method = Reflection::new_constructor(m, CHECK_NULL);
1946 }
1947 return JNIHandles::make_local(method);
1948 }
1949
1950 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1951 {
1952 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1953 JvmtiVMObjectAllocEventCollector oam;
1954 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1955 bounds_check(cp, index, CHECK_NULL);
1956 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1957 return res;
1958 }
1959 JVM_END
1960
1961 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1962 {
1963 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1964 JvmtiVMObjectAllocEventCollector oam;
1965 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1966 bounds_check(cp, index, CHECK_NULL);
1967 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1968 return res;
1969 }
1970 JVM_END
1971
1972 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1973 constantTag tag = cp->tag_at(index);
1974 if (!tag.is_field()) {
1975 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1976 }
1977 int klass_ref = cp->uncached_klass_ref_index_at(index);
1978 Klass* k_o;
1979 if (force_resolution) {
1980 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1981 } else {
1982 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1983 if (k_o == NULL) return NULL;
1984 }
1985 instanceKlassHandle k(THREAD, k_o);
1986 Symbol* name = cp->uncached_name_ref_at(index);
1987 Symbol* sig = cp->uncached_signature_ref_at(index);
1988 fieldDescriptor fd;
1989 Klass* target_klass = k->find_field(name, sig, &fd);
1990 if (target_klass == NULL) {
1991 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
1992 }
1993 oop field = Reflection::new_field(&fd, CHECK_NULL);
1994 return JNIHandles::make_local(field);
1995 }
1996
1997 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
1998 {
1999 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2000 JvmtiVMObjectAllocEventCollector oam;
2001 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2002 bounds_check(cp, index, CHECK_NULL);
2003 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2004 return res;
2005 }
2006 JVM_END
2007
2008 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2009 {
2010 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2011 JvmtiVMObjectAllocEventCollector oam;
2012 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2013 bounds_check(cp, index, CHECK_NULL);
2014 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2015 return res;
2016 }
2017 JVM_END
2018
2019 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2020 {
2021 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2022 JvmtiVMObjectAllocEventCollector oam;
2023 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2024 bounds_check(cp, index, CHECK_NULL);
2025 constantTag tag = cp->tag_at(index);
2026 if (!tag.is_field_or_method()) {
2027 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2028 }
2029 int klass_ref = cp->uncached_klass_ref_index_at(index);
2030 Symbol* klass_name = cp->klass_name_at(klass_ref);
2031 Symbol* member_name = cp->uncached_name_ref_at(index);
2032 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2033 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2034 objArrayHandle dest(THREAD, dest_o);
2035 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2036 dest->obj_at_put(0, str());
2037 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2038 dest->obj_at_put(1, str());
2039 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2040 dest->obj_at_put(2, str());
2041 return (jobjectArray) JNIHandles::make_local(dest());
2042 }
2043 JVM_END
2044
2045 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2046 {
2047 JVMWrapper("JVM_ConstantPoolGetIntAt");
2048 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2049 bounds_check(cp, index, CHECK_0);
2050 constantTag tag = cp->tag_at(index);
2051 if (!tag.is_int()) {
2052 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2053 }
2054 return cp->int_at(index);
2055 }
2056 JVM_END
2057
2058 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2059 {
2060 JVMWrapper("JVM_ConstantPoolGetLongAt");
2061 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2062 bounds_check(cp, index, CHECK_(0L));
2063 constantTag tag = cp->tag_at(index);
2064 if (!tag.is_long()) {
2065 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2066 }
2067 return cp->long_at(index);
2068 }
2069 JVM_END
2070
2071 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2072 {
2073 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2074 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2075 bounds_check(cp, index, CHECK_(0.0f));
2076 constantTag tag = cp->tag_at(index);
2077 if (!tag.is_float()) {
2078 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2079 }
2080 return cp->float_at(index);
2081 }
2082 JVM_END
2083
2084 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2085 {
2086 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2087 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2088 bounds_check(cp, index, CHECK_(0.0));
2089 constantTag tag = cp->tag_at(index);
2090 if (!tag.is_double()) {
2091 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2092 }
2093 return cp->double_at(index);
2094 }
2095 JVM_END
2096
2097 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2098 {
2099 JVMWrapper("JVM_ConstantPoolGetStringAt");
2100 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2101 bounds_check(cp, index, CHECK_NULL);
2102 constantTag tag = cp->tag_at(index);
2103 if (!tag.is_string()) {
2104 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2105 }
2106 oop str = cp->string_at(index, CHECK_NULL);
2107 return (jstring) JNIHandles::make_local(str);
2108 }
2109 JVM_END
2110
2111 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2112 {
2113 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2114 JvmtiVMObjectAllocEventCollector oam;
2115 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2116 bounds_check(cp, index, CHECK_NULL);
2117 constantTag tag = cp->tag_at(index);
2118 if (!tag.is_symbol()) {
2119 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2120 }
2121 Symbol* sym = cp->symbol_at(index);
2122 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2123 return (jstring) JNIHandles::make_local(str());
2124 }
2125 JVM_END
2126
2127
2128 // Assertion support. //////////////////////////////////////////////////////////
2129
2130 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2131 JVMWrapper("JVM_DesiredAssertionStatus");
2132 assert(cls != NULL, "bad class");
2133
2134 oop r = JNIHandles::resolve(cls);
2135 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2136 if (java_lang_Class::is_primitive(r)) return false;
2137
2138 Klass* k = java_lang_Class::as_Klass(r);
2139 assert(k->oop_is_instance(), "must be an instance klass");
2140 if (! k->oop_is_instance()) return false;
2141
2142 ResourceMark rm(THREAD);
2143 const char* name = k->name()->as_C_string();
2144 bool system_class = k->class_loader() == NULL;
2145 return JavaAssertions::enabled(name, system_class);
2146
2147 JVM_END
2148
2149
2150 // Return a new AssertionStatusDirectives object with the fields filled in with
2151 // command-line assertion arguments (i.e., -ea, -da).
2152 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2153 JVMWrapper("JVM_AssertionStatusDirectives");
2154 JvmtiVMObjectAllocEventCollector oam;
2155 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2156 return JNIHandles::make_local(env, asd);
2157 JVM_END
2158
2159 // Verification ////////////////////////////////////////////////////////////////////////////////
2160
2161 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2162
2163 // RedefineClasses support: bug 6214132 caused verification to fail.
2164 // All functions from this section should call the jvmtiThreadSate function:
2165 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2166 // The function returns a Klass* of the _scratch_class if the verifier
2167 // was invoked in the middle of the class redefinition.
2168 // Otherwise it returns its argument value which is the _the_class Klass*.
2169 // Please, refer to the description in the jvmtiThreadSate.hpp.
2170
2171 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2172 JVMWrapper("JVM_GetClassNameUTF");
2173 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2174 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2175 return k->name()->as_utf8();
2176 JVM_END
2177
2178
2179 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2180 JVMWrapper("JVM_GetClassCPTypes");
2181 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2182 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2183 // types will have length zero if this is not an InstanceKlass
2184 // (length is determined by call to JVM_GetClassCPEntriesCount)
2185 if (k->oop_is_instance()) {
2186 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2187 for (int index = cp->length() - 1; index >= 0; index--) {
2188 constantTag tag = cp->tag_at(index);
2189 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2190 }
2191 }
2192 JVM_END
2193
2194
2195 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2196 JVMWrapper("JVM_GetClassCPEntriesCount");
2197 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2198 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2199 if (!k->oop_is_instance())
2200 return 0;
2201 return InstanceKlass::cast(k)->constants()->length();
2202 JVM_END
2203
2204
2205 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2206 JVMWrapper("JVM_GetClassFieldsCount");
2207 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2208 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2209 if (!k->oop_is_instance())
2210 return 0;
2211 return InstanceKlass::cast(k)->java_fields_count();
2212 JVM_END
2213
2214
2215 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2216 JVMWrapper("JVM_GetClassMethodsCount");
2217 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2218 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2219 if (!k->oop_is_instance())
2220 return 0;
2221 return InstanceKlass::cast(k)->methods()->length();
2222 JVM_END
2223
2224
2225 // The following methods, used for the verifier, are never called with
2226 // array klasses, so a direct cast to InstanceKlass is safe.
2227 // Typically, these methods are called in a loop with bounds determined
2228 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2229 // zero for arrays.
2230 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2231 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2232 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2233 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2234 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2235 int length = method->checked_exceptions_length();
2236 if (length > 0) {
2237 CheckedExceptionElement* table= method->checked_exceptions_start();
2238 for (int i = 0; i < length; i++) {
2239 exceptions[i] = table[i].class_cp_index;
2240 }
2241 }
2242 JVM_END
2243
2244
2245 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2246 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2247 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2248 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2249 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2250 return method->checked_exceptions_length();
2251 JVM_END
2252
2253
2254 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2255 JVMWrapper("JVM_GetMethodIxByteCode");
2256 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2257 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2258 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2259 memcpy(code, method->code_base(), method->code_size());
2260 JVM_END
2261
2262
2263 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2264 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2265 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2266 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2267 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2268 return method->code_size();
2269 JVM_END
2270
2271
2272 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2273 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2274 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2275 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2276 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2277 ExceptionTable extable(method);
2278 entry->start_pc = extable.start_pc(entry_index);
2279 entry->end_pc = extable.end_pc(entry_index);
2280 entry->handler_pc = extable.handler_pc(entry_index);
2281 entry->catchType = extable.catch_type_index(entry_index);
2282 JVM_END
2283
2284
2285 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2286 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2287 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2288 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2289 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2290 return method->exception_table_length();
2291 JVM_END
2292
2293
2294 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2295 JVMWrapper("JVM_GetMethodIxModifiers");
2296 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2297 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2298 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2299 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2300 JVM_END
2301
2302
2303 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2304 JVMWrapper("JVM_GetFieldIxModifiers");
2305 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2306 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2307 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2308 JVM_END
2309
2310
2311 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2312 JVMWrapper("JVM_GetMethodIxLocalsCount");
2313 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2314 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2315 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2316 return method->max_locals();
2317 JVM_END
2318
2319
2320 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2321 JVMWrapper("JVM_GetMethodIxArgsSize");
2322 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2323 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2324 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2325 return method->size_of_parameters();
2326 JVM_END
2327
2328
2329 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2330 JVMWrapper("JVM_GetMethodIxMaxStack");
2331 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2332 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2333 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2334 return method->verifier_max_stack();
2335 JVM_END
2336
2337
2338 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2339 JVMWrapper("JVM_IsConstructorIx");
2340 ResourceMark rm(THREAD);
2341 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2342 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2343 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2344 return method->name() == vmSymbols::object_initializer_name();
2345 JVM_END
2346
2347
2348 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2349 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2350 ResourceMark rm(THREAD);
2351 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2352 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2353 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2354 return method->is_overpass();
2355 JVM_END
2356
2357 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2358 JVMWrapper("JVM_GetMethodIxIxUTF");
2359 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2360 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2361 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2362 return method->name()->as_utf8();
2363 JVM_END
2364
2365
2366 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2367 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2368 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2369 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2370 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2371 return method->signature()->as_utf8();
2372 JVM_END
2373
2374 /**
2375 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2376 * read entries in the constant pool. Since the old verifier always
2377 * works on a copy of the code, it will not see any rewriting that
2378 * may possibly occur in the middle of verification. So it is important
2379 * that nothing it calls tries to use the cpCache instead of the raw
2380 * constant pool, so we must use cp->uncached_x methods when appropriate.
2381 */
2382 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2383 JVMWrapper("JVM_GetCPFieldNameUTF");
2384 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2385 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2386 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2387 switch (cp->tag_at(cp_index).value()) {
2388 case JVM_CONSTANT_Fieldref:
2389 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2390 default:
2391 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2392 }
2393 ShouldNotReachHere();
2394 return NULL;
2395 JVM_END
2396
2397
2398 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2399 JVMWrapper("JVM_GetCPMethodNameUTF");
2400 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2401 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2402 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2403 switch (cp->tag_at(cp_index).value()) {
2404 case JVM_CONSTANT_InterfaceMethodref:
2405 case JVM_CONSTANT_Methodref:
2406 case JVM_CONSTANT_NameAndType: // for invokedynamic
2407 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2408 default:
2409 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2410 }
2411 ShouldNotReachHere();
2412 return NULL;
2413 JVM_END
2414
2415
2416 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2417 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2418 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2419 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2420 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2421 switch (cp->tag_at(cp_index).value()) {
2422 case JVM_CONSTANT_InterfaceMethodref:
2423 case JVM_CONSTANT_Methodref:
2424 case JVM_CONSTANT_NameAndType: // for invokedynamic
2425 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2426 default:
2427 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2428 }
2429 ShouldNotReachHere();
2430 return NULL;
2431 JVM_END
2432
2433
2434 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2435 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2436 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2437 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2438 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2439 switch (cp->tag_at(cp_index).value()) {
2440 case JVM_CONSTANT_Fieldref:
2441 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2442 default:
2443 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2444 }
2445 ShouldNotReachHere();
2446 return NULL;
2447 JVM_END
2448
2449
2450 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2451 JVMWrapper("JVM_GetCPClassNameUTF");
2452 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2453 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2454 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2455 Symbol* classname = cp->klass_name_at(cp_index);
2456 return classname->as_utf8();
2457 JVM_END
2458
2459
2460 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2461 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2462 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2463 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2464 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2465 switch (cp->tag_at(cp_index).value()) {
2466 case JVM_CONSTANT_Fieldref: {
2467 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2468 Symbol* classname = cp->klass_name_at(class_index);
2469 return classname->as_utf8();
2470 }
2471 default:
2472 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2473 }
2474 ShouldNotReachHere();
2475 return NULL;
2476 JVM_END
2477
2478
2479 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2480 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2481 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2482 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2483 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2484 switch (cp->tag_at(cp_index).value()) {
2485 case JVM_CONSTANT_Methodref:
2486 case JVM_CONSTANT_InterfaceMethodref: {
2487 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2488 Symbol* classname = cp->klass_name_at(class_index);
2489 return classname->as_utf8();
2490 }
2491 default:
2492 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2493 }
2494 ShouldNotReachHere();
2495 return NULL;
2496 JVM_END
2497
2498
2499 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2500 JVMWrapper("JVM_GetCPFieldModifiers");
2501 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2502 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2503 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2504 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2505 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2506 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2507 switch (cp->tag_at(cp_index).value()) {
2508 case JVM_CONSTANT_Fieldref: {
2509 Symbol* name = cp->uncached_name_ref_at(cp_index);
2510 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2511 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2512 if (fs.name() == name && fs.signature() == signature) {
2513 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2514 }
2515 }
2516 return -1;
2517 }
2518 default:
2519 fatal("JVM_GetCPFieldModifiers: illegal constant");
2520 }
2521 ShouldNotReachHere();
2522 return 0;
2523 JVM_END
2524
2525
2526 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2527 JVMWrapper("JVM_GetCPMethodModifiers");
2528 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2529 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2530 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2531 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2532 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2533 switch (cp->tag_at(cp_index).value()) {
2534 case JVM_CONSTANT_Methodref:
2535 case JVM_CONSTANT_InterfaceMethodref: {
2536 Symbol* name = cp->uncached_name_ref_at(cp_index);
2537 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2538 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2539 int methods_count = methods->length();
2540 for (int i = 0; i < methods_count; i++) {
2541 Method* method = methods->at(i);
2542 if (method->name() == name && method->signature() == signature) {
2543 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2544 }
2545 }
2546 return -1;
2547 }
2548 default:
2549 fatal("JVM_GetCPMethodModifiers: illegal constant");
2550 }
2551 ShouldNotReachHere();
2552 return 0;
2553 JVM_END
2554
2555
2556 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2557
2558 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2559 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2560 JVM_END
2561
2562
2563 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2564 JVMWrapper("JVM_IsSameClassPackage");
2565 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2566 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2567 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2568 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2569 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2570 JVM_END
2571
2572 // Printing support //////////////////////////////////////////////////
2573 extern "C" {
2574
2575 ATTRIBUTE_PRINTF(3, 0)
2576 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2577 // see bug 4399518, 4417214
2578 if ((intptr_t)count <= 0) return -1;
2579
2580 int result = vsnprintf(str, count, fmt, args);
2581 // Note: on truncation vsnprintf(3) on Unix returns numbers of
2582 // characters which would have been written had the buffer been large
2583 // enough; on Windows, it returns -1. We handle both cases here and
2584 // always return -1, and perform null termination.
2585 if ((result > 0 && (size_t)result >= count) || result == -1) {
2586 str[count - 1] = '\0';
2587 result = -1;
2588 }
2589
2590 return result;
2591 }
2592
2593 ATTRIBUTE_PRINTF(3, 0)
2594 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2595 va_list args;
2596 int len;
2597 va_start(args, fmt);
2598 len = jio_vsnprintf(str, count, fmt, args);
2599 va_end(args);
2600 return len;
2601 }
2602
2603 ATTRIBUTE_PRINTF(2,3)
2604 int jio_fprintf(FILE* f, const char *fmt, ...) {
2605 int len;
2606 va_list args;
2607 va_start(args, fmt);
2608 len = jio_vfprintf(f, fmt, args);
2609 va_end(args);
2610 return len;
2611 }
2612
2613 ATTRIBUTE_PRINTF(2, 0)
2614 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2615 if (Arguments::vfprintf_hook() != NULL) {
2616 return Arguments::vfprintf_hook()(f, fmt, args);
2617 } else {
2618 return vfprintf(f, fmt, args);
2619 }
2620 }
2621
2622 ATTRIBUTE_PRINTF(1, 2)
2623 JNIEXPORT int jio_printf(const char *fmt, ...) {
2624 int len;
2625 va_list args;
2626 va_start(args, fmt);
2627 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2628 va_end(args);
2629 return len;
2630 }
2631
2632
2633 // HotSpot specific jio method
2634 void jio_print(const char* s) {
2635 // Try to make this function as atomic as possible.
2636 if (Arguments::vfprintf_hook() != NULL) {
2637 jio_fprintf(defaultStream::output_stream(), "%s", s);
2638 } else {
2639 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2640 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2641 }
2642 }
2643
2644 } // Extern C
2645
2646 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2647
2648 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2649 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2650 // OSThread objects. The exception to this rule is when the target object is the thread
2651 // doing the operation, in which case we know that the thread won't exit until the
2652 // operation is done (all exits being voluntary). There are a few cases where it is
2653 // rather silly to do operations on yourself, like resuming yourself or asking whether
2654 // you are alive. While these can still happen, they are not subject to deadlocks if
2655 // the lock is held while the operation occurs (this is not the case for suspend, for
2656 // instance), and are very unlikely. Because IsAlive needs to be fast and its
2657 // implementation is local to this file, we always lock Threads_lock for that one.
2658
2659 static void thread_entry(JavaThread* thread, TRAPS) {
2660 HandleMark hm(THREAD);
2661 Handle obj(THREAD, thread->threadObj());
2662 JavaValue result(T_VOID);
2663 JavaCalls::call_virtual(&result,
2664 obj,
2665 KlassHandle(THREAD, SystemDictionary::Thread_klass()),
2666 vmSymbols::run_method_name(),
2667 vmSymbols::void_method_signature(),
2668 THREAD);
2669 }
2670
2671
2672 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2673 JVMWrapper("JVM_StartThread");
2674 JavaThread *native_thread = NULL;
2675
2676 // We cannot hold the Threads_lock when we throw an exception,
2677 // due to rank ordering issues. Example: we might need to grab the
2678 // Heap_lock while we construct the exception.
2679 bool throw_illegal_thread_state = false;
2680
2681 // We must release the Threads_lock before we can post a jvmti event
2682 // in Thread::start.
2683 {
2684 // Ensure that the C++ Thread and OSThread structures aren't freed before
2685 // we operate.
2686 MutexLocker mu(Threads_lock);
2687
2688 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2689 // re-starting an already started thread, so we should usually find
2690 // that the JavaThread is null. However for a JNI attached thread
2691 // there is a small window between the Thread object being created
2692 // (with its JavaThread set) and the update to its threadStatus, so we
2693 // have to check for this
2694 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2695 throw_illegal_thread_state = true;
2696 } else {
2697 // We could also check the stillborn flag to see if this thread was already stopped, but
2698 // for historical reasons we let the thread detect that itself when it starts running
2699
2700 jlong size =
2701 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2702 // Allocate the C++ Thread structure and create the native thread. The
2703 // stack size retrieved from java is signed, but the constructor takes
2704 // size_t (an unsigned type), so avoid passing negative values which would
2705 // result in really large stacks.
2706 size_t sz = size > 0 ? (size_t) size : 0;
2707 native_thread = new JavaThread(&thread_entry, sz);
2708
2709 // At this point it may be possible that no osthread was created for the
2710 // JavaThread due to lack of memory. Check for this situation and throw
2711 // an exception if necessary. Eventually we may want to change this so
2712 // that we only grab the lock if the thread was created successfully -
2713 // then we can also do this check and throw the exception in the
2714 // JavaThread constructor.
2715 if (native_thread->osthread() != NULL) {
2716 // Note: the current thread is not being used within "prepare".
2717 native_thread->prepare(jthread);
2718 }
2719 }
2720 }
2721
2722 if (throw_illegal_thread_state) {
2723 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2724 }
2725
2726 assert(native_thread != NULL, "Starting null thread?");
2727
2728 if (native_thread->osthread() == NULL) {
2729 // No one should hold a reference to the 'native_thread'.
2730 delete native_thread;
2731 if (JvmtiExport::should_post_resource_exhausted()) {
2732 JvmtiExport::post_resource_exhausted(
2733 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2734 os::native_thread_creation_failed_msg());
2735 }
2736 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2737 os::native_thread_creation_failed_msg());
2738 }
2739
2740 Thread::start(native_thread);
2741
2742 JVM_END
2743
2744 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2745 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2746 // but is thought to be reliable and simple. In the case, where the receiver is the
2747 // same thread as the sender, no safepoint is needed.
2748 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2749 JVMWrapper("JVM_StopThread");
2750
2751 oop java_throwable = JNIHandles::resolve(throwable);
2752 if (java_throwable == NULL) {
2753 THROW(vmSymbols::java_lang_NullPointerException());
2754 }
2755 oop java_thread = JNIHandles::resolve_non_null(jthread);
2756 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2757 Events::log_exception(JavaThread::current(),
2758 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2759 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2760 // First check if thread is alive
2761 if (receiver != NULL) {
2762 // Check if exception is getting thrown at self (use oop equality, since the
2763 // target object might exit)
2764 if (java_thread == thread->threadObj()) {
2765 THROW_OOP(java_throwable);
2766 } else {
2767 // Enques a VM_Operation to stop all threads and then deliver the exception...
2768 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2769 }
2770 }
2771 else {
2772 // Either:
2773 // - target thread has not been started before being stopped, or
2774 // - target thread already terminated
2775 // We could read the threadStatus to determine which case it is
2776 // but that is overkill as it doesn't matter. We must set the
2777 // stillborn flag for the first case, and if the thread has already
2778 // exited setting this flag has no affect
2779 java_lang_Thread::set_stillborn(java_thread);
2780 }
2781 JVM_END
2782
2783
2784 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2785 JVMWrapper("JVM_IsThreadAlive");
2786
2787 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2788 return java_lang_Thread::is_alive(thread_oop);
2789 JVM_END
2790
2791
2792 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2793 JVMWrapper("JVM_SuspendThread");
2794 oop java_thread = JNIHandles::resolve_non_null(jthread);
2795 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2796
2797 if (receiver != NULL) {
2798 // thread has run and has not exited (still on threads list)
2799
2800 {
2801 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2802 if (receiver->is_external_suspend()) {
2803 // Don't allow nested external suspend requests. We can't return
2804 // an error from this interface so just ignore the problem.
2805 return;
2806 }
2807 if (receiver->is_exiting()) { // thread is in the process of exiting
2808 return;
2809 }
2810 receiver->set_external_suspend();
2811 }
2812
2813 // java_suspend() will catch threads in the process of exiting
2814 // and will ignore them.
2815 receiver->java_suspend();
2816
2817 // It would be nice to have the following assertion in all the
2818 // time, but it is possible for a racing resume request to have
2819 // resumed this thread right after we suspended it. Temporarily
2820 // enable this assertion if you are chasing a different kind of
2821 // bug.
2822 //
2823 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2824 // receiver->is_being_ext_suspended(), "thread is not suspended");
2825 }
2826 JVM_END
2827
2828
2829 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2830 JVMWrapper("JVM_ResumeThread");
2831 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2832 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2833 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2834 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2835 // looks at it.
2836 MutexLocker ml(Threads_lock);
2837 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2838 if (thr != NULL) {
2839 // the thread has run and is not in the process of exiting
2840 thr->java_resume();
2841 }
2842 JVM_END
2843
2844
2845 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2846 JVMWrapper("JVM_SetThreadPriority");
2847 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2848 MutexLocker ml(Threads_lock);
2849 oop java_thread = JNIHandles::resolve_non_null(jthread);
2850 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2851 JavaThread* thr = java_lang_Thread::thread(java_thread);
2852 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
2853 Thread::set_priority(thr, (ThreadPriority)prio);
2854 }
2855 JVM_END
2856
2857
2858 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2859 JVMWrapper("JVM_Yield");
2860 if (os::dont_yield()) return;
2861 HOTSPOT_THREAD_YIELD();
2862
2863 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
2864 // Critical for similar threading behaviour
2865 if (ConvertYieldToSleep) {
2866 os::sleep(thread, MinSleepInterval, false);
2867 } else {
2868 os::naked_yield();
2869 }
2870 JVM_END
2871
2872
2873 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2874 JVMWrapper("JVM_Sleep");
2875
2876 if (millis < 0) {
2877 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2878 }
2879
2880 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2881 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2882 }
2883
2884 // Save current thread state and restore it at the end of this block.
2885 // And set new thread state to SLEEPING.
2886 JavaThreadSleepState jtss(thread);
2887
2888 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2889
2890 EventThreadSleep event;
2891
2892 if (millis == 0) {
2893 // When ConvertSleepToYield is on, this matches the classic VM implementation of
2894 // JVM_Sleep. Critical for similar threading behaviour (Win32)
2895 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
2896 // for SOLARIS
2897 if (ConvertSleepToYield) {
2898 os::naked_yield();
2899 } else {
2900 ThreadState old_state = thread->osthread()->get_state();
2901 thread->osthread()->set_state(SLEEPING);
2902 os::sleep(thread, MinSleepInterval, false);
2903 thread->osthread()->set_state(old_state);
2904 }
2905 } else {
2906 ThreadState old_state = thread->osthread()->get_state();
2907 thread->osthread()->set_state(SLEEPING);
2908 if (os::sleep(thread, millis, true) == OS_INTRPT) {
2909 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
2910 // us while we were sleeping. We do not overwrite those.
2911 if (!HAS_PENDING_EXCEPTION) {
2912 if (event.should_commit()) {
2913 event.set_time(millis);
2914 event.commit();
2915 }
2916 HOTSPOT_THREAD_SLEEP_END(1);
2917
2918 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2919 // to properly restore the thread state. That's likely wrong.
2920 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2921 }
2922 }
2923 thread->osthread()->set_state(old_state);
2924 }
2925 if (event.should_commit()) {
2926 event.set_time(millis);
2927 event.commit();
2928 }
2929 HOTSPOT_THREAD_SLEEP_END(0);
2930 JVM_END
2931
2932 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
2933 JVMWrapper("JVM_CurrentThread");
2934 oop jthread = thread->threadObj();
2935 assert (thread != NULL, "no current thread!");
2936 return JNIHandles::make_local(env, jthread);
2937 JVM_END
2938
2939
2940 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
2941 JVMWrapper("JVM_CountStackFrames");
2942
2943 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2944 oop java_thread = JNIHandles::resolve_non_null(jthread);
2945 bool throw_illegal_thread_state = false;
2946 int count = 0;
2947
2948 {
2949 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
2950 // We need to re-resolve the java_thread, since a GC might have happened during the
2951 // acquire of the lock
2952 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2953
2954 if (thr == NULL) {
2955 // do nothing
2956 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
2957 // Check whether this java thread has been suspended already. If not, throws
2958 // IllegalThreadStateException. We defer to throw that exception until
2959 // Threads_lock is released since loading exception class has to leave VM.
2960 // The correct way to test a thread is actually suspended is
2961 // wait_for_ext_suspend_completion(), but we can't call that while holding
2962 // the Threads_lock. The above tests are sufficient for our purposes
2963 // provided the walkability of the stack is stable - which it isn't
2964 // 100% but close enough for most practical purposes.
2965 throw_illegal_thread_state = true;
2966 } else {
2967 // Count all java activation, i.e., number of vframes
2968 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
2969 // Native frames are not counted
2970 if (!vfst.method()->is_native()) count++;
2971 }
2972 }
2973 }
2974
2975 if (throw_illegal_thread_state) {
2976 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
2977 "this thread is not suspended");
2978 }
2979 return count;
2980 JVM_END
2981
2982 // Consider: A better way to implement JVM_Interrupt() is to acquire
2983 // Threads_lock to resolve the jthread into a Thread pointer, fetch
2984 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
2985 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
2986 // outside the critical section. Threads_lock is hot so we want to minimize
2987 // the hold-time. A cleaner interface would be to decompose interrupt into
2988 // two steps. The 1st phase, performed under Threads_lock, would return
2989 // a closure that'd be invoked after Threads_lock was dropped.
2990 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
2991 // admit spurious wakeups.
2992
2993 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
2994 JVMWrapper("JVM_Interrupt");
2995
2996 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2997 oop java_thread = JNIHandles::resolve_non_null(jthread);
2998 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
2999 // We need to re-resolve the java_thread, since a GC might have happened during the
3000 // acquire of the lock
3001 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3002 if (thr != NULL) {
3003 Thread::interrupt(thr);
3004 }
3005 JVM_END
3006
3007
3008 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3009 JVMWrapper("JVM_IsInterrupted");
3010
3011 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3012 oop java_thread = JNIHandles::resolve_non_null(jthread);
3013 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3014 // We need to re-resolve the java_thread, since a GC might have happened during the
3015 // acquire of the lock
3016 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3017 if (thr == NULL) {
3018 return JNI_FALSE;
3019 } else {
3020 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3021 }
3022 JVM_END
3023
3024
3025 // Return true iff the current thread has locked the object passed in
3026
3027 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3028 JVMWrapper("JVM_HoldsLock");
3029 assert(THREAD->is_Java_thread(), "sanity check");
3030 if (obj == NULL) {
3031 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3032 }
3033 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3034 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3035 JVM_END
3036
3037
3038 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3039 JVMWrapper("JVM_DumpAllStacks");
3040 VM_PrintThreads op;
3041 VMThread::execute(&op);
3042 if (JvmtiExport::should_post_data_dump()) {
3043 JvmtiExport::post_data_dump();
3044 }
3045 JVM_END
3046
3047 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3048 JVMWrapper("JVM_SetNativeThreadName");
3049 ResourceMark rm(THREAD);
3050 oop java_thread = JNIHandles::resolve_non_null(jthread);
3051 JavaThread* thr = java_lang_Thread::thread(java_thread);
3052 // Thread naming only supported for the current thread, doesn't work for
3053 // target threads.
3054 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3055 // we don't set the name of an attached thread to avoid stepping
3056 // on other programs
3057 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3058 os::set_native_thread_name(thread_name);
3059 }
3060 JVM_END
3061
3062 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3063
3064 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3065 assert(jthread->is_Java_thread(), "must be a Java thread");
3066 if (jthread->privileged_stack_top() == NULL) return false;
3067 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3068 oop loader = jthread->privileged_stack_top()->class_loader();
3069 if (loader == NULL) return true;
3070 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3071 if (trusted) return true;
3072 }
3073 return false;
3074 }
3075
3076 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3077 JVMWrapper("JVM_CurrentLoadedClass");
3078 ResourceMark rm(THREAD);
3079
3080 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3081 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3082 bool trusted = is_trusted_frame(thread, &vfst);
3083 if (trusted) return NULL;
3084
3085 Method* m = vfst.method();
3086 if (!m->is_native()) {
3087 InstanceKlass* holder = m->method_holder();
3088 oop loader = holder->class_loader();
3089 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3090 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3091 }
3092 }
3093 }
3094 return NULL;
3095 JVM_END
3096
3097
3098 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3099 JVMWrapper("JVM_CurrentClassLoader");
3100 ResourceMark rm(THREAD);
3101
3102 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3103
3104 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3105 bool trusted = is_trusted_frame(thread, &vfst);
3106 if (trusted) return NULL;
3107
3108 Method* m = vfst.method();
3109 if (!m->is_native()) {
3110 InstanceKlass* holder = m->method_holder();
3111 assert(holder->is_klass(), "just checking");
3112 oop loader = holder->class_loader();
3113 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3114 return JNIHandles::make_local(env, loader);
3115 }
3116 }
3117 }
3118 return NULL;
3119 JVM_END
3120
3121
3122 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3123 JVMWrapper("JVM_GetClassContext");
3124 ResourceMark rm(THREAD);
3125 JvmtiVMObjectAllocEventCollector oam;
3126 vframeStream vfst(thread);
3127
3128 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3129 // This must only be called from SecurityManager.getClassContext
3130 Method* m = vfst.method();
3131 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3132 m->name() == vmSymbols::getClassContext_name() &&
3133 m->signature() == vmSymbols::void_class_array_signature())) {
3134 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3135 }
3136 }
3137
3138 // Collect method holders
3139 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3140 for (; !vfst.at_end(); vfst.security_next()) {
3141 Method* m = vfst.method();
3142 // Native frames are not returned
3143 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3144 Klass* holder = m->method_holder();
3145 assert(holder->is_klass(), "just checking");
3146 klass_array->append(holder);
3147 }
3148 }
3149
3150 // Create result array of type [Ljava/lang/Class;
3151 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3152 // Fill in mirrors corresponding to method holders
3153 for (int i = 0; i < klass_array->length(); i++) {
3154 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3155 }
3156
3157 return (jobjectArray) JNIHandles::make_local(env, result);
3158 JVM_END
3159
3160
3161 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3162 JVMWrapper("JVM_ClassDepth");
3163 ResourceMark rm(THREAD);
3164 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3165 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3166
3167 const char* str = java_lang_String::as_utf8_string(class_name_str());
3168 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3169 if (class_name_sym == NULL) {
3170 return -1;
3171 }
3172
3173 int depth = 0;
3174
3175 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3176 if (!vfst.method()->is_native()) {
3177 InstanceKlass* holder = vfst.method()->method_holder();
3178 assert(holder->is_klass(), "just checking");
3179 if (holder->name() == class_name_sym) {
3180 return depth;
3181 }
3182 depth++;
3183 }
3184 }
3185 return -1;
3186 JVM_END
3187
3188
3189 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3190 JVMWrapper("JVM_ClassLoaderDepth");
3191 ResourceMark rm(THREAD);
3192 int depth = 0;
3193 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3194 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3195 bool trusted = is_trusted_frame(thread, &vfst);
3196 if (trusted) return -1;
3197
3198 Method* m = vfst.method();
3199 if (!m->is_native()) {
3200 InstanceKlass* holder = m->method_holder();
3201 assert(holder->is_klass(), "just checking");
3202 oop loader = holder->class_loader();
3203 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3204 return depth;
3205 }
3206 depth++;
3207 }
3208 }
3209 return -1;
3210 JVM_END
3211
3212
3213 // java.lang.Package ////////////////////////////////////////////////////////////////
3214
3215
3216 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3217 JVMWrapper("JVM_GetSystemPackage");
3218 ResourceMark rm(THREAD);
3219 JvmtiVMObjectAllocEventCollector oam;
3220 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3221 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3222 return (jstring) JNIHandles::make_local(result);
3223 JVM_END
3224
3225
3226 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3227 JVMWrapper("JVM_GetSystemPackages");
3228 JvmtiVMObjectAllocEventCollector oam;
3229 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3230 return (jobjectArray) JNIHandles::make_local(result);
3231 JVM_END
3232
3233
3234 // ObjectInputStream ///////////////////////////////////////////////////////////////
3235
3236 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3237 if (current_class == NULL) {
3238 return true;
3239 }
3240 if ((current_class == field_class) || access.is_public()) {
3241 return true;
3242 }
3243
3244 if (access.is_protected()) {
3245 // See if current_class is a subclass of field_class
3246 if (current_class->is_subclass_of(field_class)) {
3247 return true;
3248 }
3249 }
3250
3251 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3252 }
3253
3254 // Return the first non-null class loader up the execution stack, or null
3255 // if only code from the null class loader is on the stack.
3256
3257 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3258 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3259 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3260 oop loader = vfst.method()->method_holder()->class_loader();
3261 if (loader != NULL) {
3262 return JNIHandles::make_local(env, loader);
3263 }
3264 }
3265 return NULL;
3266 JVM_END
3267
3268
3269 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3270
3271
3272 // resolve array handle and check arguments
3273 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3274 if (arr == NULL) {
3275 THROW_0(vmSymbols::java_lang_NullPointerException());
3276 }
3277 oop a = JNIHandles::resolve_non_null(arr);
3278 if (!a->is_array()) {
3279 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3280 } else if (type_array_only && !a->is_typeArray()) {
3281 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3282 }
3283 return arrayOop(a);
3284 }
3285
3286
3287 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3288 JVMWrapper("JVM_GetArrayLength");
3289 arrayOop a = check_array(env, arr, false, CHECK_0);
3290 return a->length();
3291 JVM_END
3292
3293
3294 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3295 JVMWrapper("JVM_Array_Get");
3296 JvmtiVMObjectAllocEventCollector oam;
3297 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3298 jvalue value;
3299 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3300 oop box = Reflection::box(&value, type, CHECK_NULL);
3301 return JNIHandles::make_local(env, box);
3302 JVM_END
3303
3304
3305 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3306 JVMWrapper("JVM_GetPrimitiveArrayElement");
3307 jvalue value;
3308 value.i = 0; // to initialize value before getting used in CHECK
3309 arrayOop a = check_array(env, arr, true, CHECK_(value));
3310 assert(a->is_typeArray(), "just checking");
3311 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3312 BasicType wide_type = (BasicType) wCode;
3313 if (type != wide_type) {
3314 Reflection::widen(&value, type, wide_type, CHECK_(value));
3315 }
3316 return value;
3317 JVM_END
3318
3319
3320 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3321 JVMWrapper("JVM_SetArrayElement");
3322 arrayOop a = check_array(env, arr, false, CHECK);
3323 oop box = JNIHandles::resolve(val);
3324 jvalue value;
3325 value.i = 0; // to initialize value before getting used in CHECK
3326 BasicType value_type;
3327 if (a->is_objArray()) {
3328 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3329 value_type = Reflection::unbox_for_regular_object(box, &value);
3330 } else {
3331 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3332 }
3333 Reflection::array_set(&value, a, index, value_type, CHECK);
3334 JVM_END
3335
3336
3337 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3338 JVMWrapper("JVM_SetPrimitiveArrayElement");
3339 arrayOop a = check_array(env, arr, true, CHECK);
3340 assert(a->is_typeArray(), "just checking");
3341 BasicType value_type = (BasicType) vCode;
3342 Reflection::array_set(&v, a, index, value_type, CHECK);
3343 JVM_END
3344
3345
3346 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3347 JVMWrapper("JVM_NewArray");
3348 JvmtiVMObjectAllocEventCollector oam;
3349 oop element_mirror = JNIHandles::resolve(eltClass);
3350 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3351 return JNIHandles::make_local(env, result);
3352 JVM_END
3353
3354
3355 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3356 JVMWrapper("JVM_NewMultiArray");
3357 JvmtiVMObjectAllocEventCollector oam;
3358 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3359 oop element_mirror = JNIHandles::resolve(eltClass);
3360 assert(dim_array->is_typeArray(), "just checking");
3361 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3362 return JNIHandles::make_local(env, result);
3363 JVM_END
3364
3365
3366 // Library support ///////////////////////////////////////////////////////////////////////////
3367
3368 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3369 //%note jvm_ct
3370 JVMWrapper2("JVM_LoadLibrary (%s)", name);
3371 char ebuf[1024];
3372 void *load_result;
3373 {
3374 ThreadToNativeFromVM ttnfvm(thread);
3375 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3376 }
3377 if (load_result == NULL) {
3378 char msg[1024];
3379 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3380 // Since 'ebuf' may contain a string encoded using
3381 // platform encoding scheme, we need to pass
3382 // Exceptions::unsafe_to_utf8 to the new_exception method
3383 // as the last argument. See bug 6367357.
3384 Handle h_exception =
3385 Exceptions::new_exception(thread,
3386 vmSymbols::java_lang_UnsatisfiedLinkError(),
3387 msg, Exceptions::unsafe_to_utf8);
3388
3389 THROW_HANDLE_0(h_exception);
3390 }
3391 return load_result;
3392 JVM_END
3393
3394
3395 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3396 JVMWrapper("JVM_UnloadLibrary");
3397 os::dll_unload(handle);
3398 JVM_END
3399
3400
3401 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3402 JVMWrapper2("JVM_FindLibraryEntry (%s)", name);
3403 return os::dll_lookup(handle, name);
3404 JVM_END
3405
3406
3407 // JNI version ///////////////////////////////////////////////////////////////////////////////
3408
3409 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3410 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version);
3411 return Threads::is_supported_jni_version_including_1_1(version);
3412 JVM_END
3413
3414
3415 // String support ///////////////////////////////////////////////////////////////////////////
3416
3417 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3418 JVMWrapper("JVM_InternString");
3419 JvmtiVMObjectAllocEventCollector oam;
3420 if (str == NULL) return NULL;
3421 oop string = JNIHandles::resolve_non_null(str);
3422 oop result = StringTable::intern(string, CHECK_NULL);
3423 return (jstring) JNIHandles::make_local(env, result);
3424 JVM_END
3425
3426
3427 // Raw monitor support //////////////////////////////////////////////////////////////////////
3428
3429 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3430 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3431 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3432 // that only works with java threads.
3433
3434
3435 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3436 VM_Exit::block_if_vm_exited();
3437 JVMWrapper("JVM_RawMonitorCreate");
3438 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3439 }
3440
3441
3442 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3443 VM_Exit::block_if_vm_exited();
3444 JVMWrapper("JVM_RawMonitorDestroy");
3445 delete ((Mutex*) mon);
3446 }
3447
3448
3449 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3450 VM_Exit::block_if_vm_exited();
3451 JVMWrapper("JVM_RawMonitorEnter");
3452 ((Mutex*) mon)->jvm_raw_lock();
3453 return 0;
3454 }
3455
3456
3457 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3458 VM_Exit::block_if_vm_exited();
3459 JVMWrapper("JVM_RawMonitorExit");
3460 ((Mutex*) mon)->jvm_raw_unlock();
3461 }
3462
3463
3464 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3465
3466 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3467 Handle loader, Handle protection_domain,
3468 jboolean throwError, TRAPS) {
3469 // Security Note:
3470 // The Java level wrapper will perform the necessary security check allowing
3471 // us to pass the NULL as the initiating class loader. The VM is responsible for
3472 // the checkPackageAccess relative to the initiating class loader via the
3473 // protection_domain. The protection_domain is passed as NULL by the java code
3474 // if there is no security manager in 3-arg Class.forName().
3475 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3476
3477 KlassHandle klass_handle(THREAD, klass);
3478 // Check if we should initialize the class
3479 if (init && klass_handle->oop_is_instance()) {
3480 klass_handle->initialize(CHECK_NULL);
3481 }
3482 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
3483 }
3484
3485
3486 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3487
3488 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3489 JVMWrapper("JVM_InvokeMethod");
3490 Handle method_handle;
3491 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3492 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3493 Handle receiver(THREAD, JNIHandles::resolve(obj));
3494 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3495 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3496 jobject res = JNIHandles::make_local(env, result);
3497 if (JvmtiExport::should_post_vm_object_alloc()) {
3498 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3499 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3500 if (java_lang_Class::is_primitive(ret_type)) {
3501 // Only for primitive type vm allocates memory for java object.
3502 // See box() method.
3503 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3504 }
3505 }
3506 return res;
3507 } else {
3508 THROW_0(vmSymbols::java_lang_StackOverflowError());
3509 }
3510 JVM_END
3511
3512
3513 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3514 JVMWrapper("JVM_NewInstanceFromConstructor");
3515 oop constructor_mirror = JNIHandles::resolve(c);
3516 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3517 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3518 jobject res = JNIHandles::make_local(env, result);
3519 if (JvmtiExport::should_post_vm_object_alloc()) {
3520 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3521 }
3522 return res;
3523 JVM_END
3524
3525 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3526
3527 JVM_LEAF(jboolean, JVM_SupportsCX8())
3528 JVMWrapper("JVM_SupportsCX8");
3529 return VM_Version::supports_cx8();
3530 JVM_END
3531
3532 // Returns an array of all live Thread objects (VM internal JavaThreads,
3533 // jvmti agent threads, and JNI attaching threads are skipped)
3534 // See CR 6404306 regarding JNI attaching threads
3535 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3536 ResourceMark rm(THREAD);
3537 ThreadsListEnumerator tle(THREAD, false, false);
3538 JvmtiVMObjectAllocEventCollector oam;
3539
3540 int num_threads = tle.num_threads();
3541 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3542 objArrayHandle threads_ah(THREAD, r);
3543
3544 for (int i = 0; i < num_threads; i++) {
3545 Handle h = tle.get_threadObj(i);
3546 threads_ah->obj_at_put(i, h());
3547 }
3548
3549 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3550 JVM_END
3551
3552
3553 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3554 // Return StackTraceElement[][], each element is the stack trace of a thread in
3555 // the corresponding entry in the given threads array
3556 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3557 JVMWrapper("JVM_DumpThreads");
3558 JvmtiVMObjectAllocEventCollector oam;
3559
3560 // Check if threads is null
3561 if (threads == NULL) {
3562 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3563 }
3564
3565 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3566 objArrayHandle ah(THREAD, a);
3567 int num_threads = ah->length();
3568 // check if threads is non-empty array
3569 if (num_threads == 0) {
3570 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3571 }
3572
3573 // check if threads is not an array of objects of Thread class
3574 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3575 if (k != SystemDictionary::Thread_klass()) {
3576 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3577 }
3578
3579 ResourceMark rm(THREAD);
3580
3581 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3582 for (int i = 0; i < num_threads; i++) {
3583 oop thread_obj = ah->obj_at(i);
3584 instanceHandle h(THREAD, (instanceOop) thread_obj);
3585 thread_handle_array->append(h);
3586 }
3587
3588 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3589 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3590
3591 JVM_END
3592
3593 // JVM monitoring and management support
3594 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3595 return Management::get_jmm_interface(version);
3596 JVM_END
3597
3598 // com.sun.tools.attach.VirtualMachine agent properties support
3599 //
3600 // Initialize the agent properties with the properties maintained in the VM
3601 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3602 JVMWrapper("JVM_InitAgentProperties");
3603 ResourceMark rm;
3604
3605 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3606
3607 PUTPROP(props, "sun.java.command", Arguments::java_command());
3608 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3609 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3610 return properties;
3611 JVM_END
3612
3613 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3614 {
3615 JVMWrapper("JVM_GetEnclosingMethodInfo");
3616 JvmtiVMObjectAllocEventCollector oam;
3617
3618 if (ofClass == NULL) {
3619 return NULL;
3620 }
3621 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3622 // Special handling for primitive objects
3623 if (java_lang_Class::is_primitive(mirror())) {
3624 return NULL;
3625 }
3626 Klass* k = java_lang_Class::as_Klass(mirror());
3627 if (!k->oop_is_instance()) {
3628 return NULL;
3629 }
3630 instanceKlassHandle ik_h(THREAD, k);
3631 int encl_method_class_idx = ik_h->enclosing_method_class_index();
3632 if (encl_method_class_idx == 0) {
3633 return NULL;
3634 }
3635 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3636 objArrayHandle dest(THREAD, dest_o);
3637 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3638 dest->obj_at_put(0, enc_k->java_mirror());
3639 int encl_method_method_idx = ik_h->enclosing_method_method_index();
3640 if (encl_method_method_idx != 0) {
3641 Symbol* sym = ik_h->constants()->symbol_at(
3642 extract_low_short_from_int(
3643 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3644 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3645 dest->obj_at_put(1, str());
3646 sym = ik_h->constants()->symbol_at(
3647 extract_high_short_from_int(
3648 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3649 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3650 dest->obj_at_put(2, str());
3651 }
3652 return (jobjectArray) JNIHandles::make_local(dest());
3653 }
3654 JVM_END
3655
3656 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3657 {
3658 memset(info, 0, info_size);
3659
3660 info->jvm_version = Abstract_VM_Version::jvm_version();
3661 info->update_version = 0; /* 0 in HotSpot Express VM */
3662 info->special_update_version = 0; /* 0 in HotSpot Express VM */
3663
3664 // when we add a new capability in the jvm_version_info struct, we should also
3665 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3666 // counter defined in runtimeService.cpp.
3667 info->is_attachable = AttachListener::is_attach_supported();
3668 }
3669 JVM_END