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 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
865 jobject loader, const jbyte *buf,
866 jsize len, jobject pd, const char *source,
867 TRAPS) {
868 if (source == NULL) source = "__JVM_DefineClass__";
869
870 assert(THREAD->is_Java_thread(), "must be a JavaThread");
871 JavaThread* jt = (JavaThread*) THREAD;
872
873 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
874 ClassLoader::perf_define_appclass_selftime(),
875 ClassLoader::perf_define_appclasses(),
876 jt->get_thread_stat()->perf_recursion_counts_addr(),
877 jt->get_thread_stat()->perf_timers_addr(),
878 PerfClassTraceTime::DEFINE_CLASS);
879
880 if (UsePerfData) {
881 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
882 }
883
884 // Since exceptions can be thrown, class initialization can take place
885 // if name is NULL no check for class name in .class stream has to be made.
886 TempNewSymbol class_name = NULL;
887 if (name != NULL) {
888 const int str_len = (int)strlen(name);
889 if (str_len > Symbol::max_length()) {
890 // It's impossible to create this class; the name cannot fit
891 // into the constant pool.
892 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
893 }
894 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
895 }
896
897 ResourceMark rm(THREAD);
898 ClassFileStream st((u1*) buf, len, (char *)source);
899 Handle class_loader (THREAD, JNIHandles::resolve(loader));
900 if (UsePerfData) {
901 is_lock_held_by_thread(class_loader,
902 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
903 THREAD);
904 }
905 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
906 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader,
907 protection_domain, &st,
908 true, CHECK_NULL);
909
910 if (TraceClassResolution && k != NULL) {
911 trace_class_resolution(k);
912 }
913
914 return (jclass) JNIHandles::make_local(env, k->java_mirror());
915 }
916
917
918 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
919 JVMWrapper2("JVM_DefineClass %s", name);
920
921 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
922 JVM_END
923
924
925 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
926 JVMWrapper2("JVM_DefineClassWithSource %s", name);
927
928 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
929 JVM_END
930
931 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
932 JVMWrapper("JVM_FindLoadedClass");
933 ResourceMark rm(THREAD);
934
935 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
936 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
937
938 const char* str = java_lang_String::as_utf8_string(string());
939 // Sanity check, don't expect null
940 if (str == NULL) return NULL;
941
942 const int str_len = (int)strlen(str);
943 if (str_len > Symbol::max_length()) {
944 // It's impossible to create this class; the name cannot fit
945 // into the constant pool.
946 return NULL;
947 }
948 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
949
950 // Security Note:
951 // The Java level wrapper will perform the necessary security check allowing
952 // us to pass the NULL as the initiating class loader.
953 Handle h_loader(THREAD, JNIHandles::resolve(loader));
954 if (UsePerfData) {
955 is_lock_held_by_thread(h_loader,
956 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
957 THREAD);
958 }
959
960 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
961 h_loader,
962 Handle(),
963 CHECK_NULL);
964 #if INCLUDE_CDS
965 if (k == NULL) {
966 // If the class is not already loaded, try to see if it's in the shared
967 // archive for the current classloader (h_loader).
968 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
969 klass_name, h_loader, CHECK_NULL);
970 k = ik();
971 }
972 #endif
973 return (k == NULL) ? NULL :
974 (jclass) JNIHandles::make_local(env, k->java_mirror());
975 JVM_END
976
977
978 // Reflection support //////////////////////////////////////////////////////////////////////////////
979
980 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
981 assert (cls != NULL, "illegal class");
982 JVMWrapper("JVM_GetClassName");
983 JvmtiVMObjectAllocEventCollector oam;
984 ResourceMark rm(THREAD);
985 const char* name;
986 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
987 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
988 } else {
989 // Consider caching interned string in Klass
990 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
991 assert(k->is_klass(), "just checking");
992 name = k->external_name();
993 }
994 oop result = StringTable::intern((char*) name, CHECK_NULL);
995 return (jstring) JNIHandles::make_local(env, result);
996 JVM_END
997
998
999 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1000 JVMWrapper("JVM_GetClassInterfaces");
1001 JvmtiVMObjectAllocEventCollector oam;
1002 oop mirror = JNIHandles::resolve_non_null(cls);
1003
1004 // Special handling for primitive objects
1005 if (java_lang_Class::is_primitive(mirror)) {
1006 // Primitive objects does not have any interfaces
1007 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1008 return (jobjectArray) JNIHandles::make_local(env, r);
1009 }
1010
1011 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
1012 // Figure size of result array
1013 int size;
1014 if (klass->is_instance_klass()) {
1015 size = InstanceKlass::cast(klass())->local_interfaces()->length();
1016 } else {
1017 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1018 size = 2;
1019 }
1020
1021 // Allocate result array
1022 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1023 objArrayHandle result (THREAD, r);
1024 // Fill in result
1025 if (klass->is_instance_klass()) {
1026 // Regular instance klass, fill in all local interfaces
1027 for (int index = 0; index < size; index++) {
1028 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
1029 result->obj_at_put(index, k->java_mirror());
1030 }
1031 } else {
1032 // All arrays implement java.lang.Cloneable and java.io.Serializable
1033 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1034 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1035 }
1036 return (jobjectArray) JNIHandles::make_local(env, result());
1037 JVM_END
1038
1039
1040 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1041 JVMWrapper("JVM_IsInterface");
1042 oop mirror = JNIHandles::resolve_non_null(cls);
1043 if (java_lang_Class::is_primitive(mirror)) {
1044 return JNI_FALSE;
1045 }
1046 Klass* k = java_lang_Class::as_Klass(mirror);
1047 jboolean result = k->is_interface();
1048 assert(!result || k->is_instance_klass(),
1049 "all interfaces are instance types");
1050 // The compiler intrinsic for isInterface tests the
1051 // Klass::_access_flags bits in the same way.
1052 return result;
1053 JVM_END
1054
1055
1056 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1057 JVMWrapper("JVM_GetClassSigners");
1058 JvmtiVMObjectAllocEventCollector oam;
1059 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1060 // There are no signers for primitive types
1061 return NULL;
1062 }
1063
1064 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1065
1066 // If there are no signers set in the class, or if the class
1067 // is an array, return NULL.
1068 if (signers == NULL) return NULL;
1069
1070 // copy of the signers array
1071 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1072 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1073 for (int index = 0; index < signers->length(); index++) {
1074 signers_copy->obj_at_put(index, signers->obj_at(index));
1075 }
1076
1077 // return the copy
1078 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1079 JVM_END
1080
1081
1082 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1083 JVMWrapper("JVM_SetClassSigners");
1084 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1085 // This call is ignored for primitive types and arrays.
1086 // Signers are only set once, ClassLoader.java, and thus shouldn't
1087 // be called with an array. Only the bootstrap loader creates arrays.
1088 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1089 if (k->is_instance_klass()) {
1090 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1091 }
1092 }
1093 JVM_END
1094
1095
1096 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1097 JVMWrapper("JVM_GetProtectionDomain");
1098 if (JNIHandles::resolve(cls) == NULL) {
1099 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1100 }
1101
1102 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1103 // Primitive types does not have a protection domain.
1104 return NULL;
1105 }
1106
1107 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1108 return (jobject) JNIHandles::make_local(env, pd);
1109 JVM_END
1110
1111
1112 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1113 // If there is a security manager and protection domain, check the access
1114 // in the protection domain, otherwise it is authorized.
1115 if (java_lang_System::has_security_manager()) {
1116
1117 // For bootstrapping, if pd implies method isn't in the JDK, allow
1118 // this context to revert to older behavior.
1119 // In this case the isAuthorized field in AccessControlContext is also not
1120 // present.
1121 if (Universe::protection_domain_implies_method() == NULL) {
1122 return true;
1123 }
1124
1125 // Whitelist certain access control contexts
1126 if (java_security_AccessControlContext::is_authorized(context)) {
1127 return true;
1128 }
1129
1130 oop prot = klass->protection_domain();
1131 if (prot != NULL) {
1132 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1133 // in the new wrapper.
1134 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1135 Handle h_prot(THREAD, prot);
1136 JavaValue result(T_BOOLEAN);
1137 JavaCallArguments args(h_prot);
1138 JavaCalls::call(&result, m, &args, CHECK_false);
1139 return (result.get_jboolean() != 0);
1140 }
1141 }
1142 return true;
1143 }
1144
1145 // Create an AccessControlContext with a protection domain with null codesource
1146 // and null permissions - which gives no permissions.
1147 oop create_dummy_access_control_context(TRAPS) {
1148 InstanceKlass* pd_klass = SystemDictionary::ProtectionDomain_klass();
1149 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1150 // Call constructor ProtectionDomain(null, null);
1151 JavaValue result(T_VOID);
1152 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1153 vmSymbols::object_initializer_name(),
1154 vmSymbols::codesource_permissioncollection_signature(),
1155 Handle(), Handle(), CHECK_NULL);
1156
1157 // new ProtectionDomain[] {pd};
1158 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1159 context->obj_at_put(0, obj());
1160
1161 // new AccessControlContext(new ProtectionDomain[] {pd})
1162 objArrayHandle h_context(THREAD, context);
1163 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1164 return acc;
1165 }
1166
1167 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1168 JVMWrapper("JVM_DoPrivileged");
1169
1170 if (action == NULL) {
1171 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1172 }
1173
1174 // Compute the frame initiating the do privileged operation and setup the privileged stack
1175 vframeStream vfst(thread);
1176 vfst.security_get_caller_frame(1);
1177
1178 if (vfst.at_end()) {
1179 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1180 }
1181
1182 Method* method = vfst.method();
1183 instanceKlassHandle klass (THREAD, method->method_holder());
1184
1185 // Check that action object understands "Object run()"
1186 Handle h_context;
1187 if (context != NULL) {
1188 h_context = Handle(THREAD, JNIHandles::resolve(context));
1189 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1190 if (!authorized) {
1191 // Create an unprivileged access control object and call it's run function
1192 // instead.
1193 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1194 h_context = Handle(THREAD, noprivs);
1195 }
1196 }
1197
1198 // Check that action object understands "Object run()"
1199 Handle object (THREAD, JNIHandles::resolve(action));
1200
1201 // get run() method
1202 Method* m_oop = object->klass()->uncached_lookup_method(
1203 vmSymbols::run_method_name(),
1204 vmSymbols::void_object_signature(),
1205 Klass::find_overpass);
1206 methodHandle m (THREAD, m_oop);
1207 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1208 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1209 }
1210
1211 // Stack allocated list of privileged stack elements
1212 PrivilegedElement pi;
1213 if (!vfst.at_end()) {
1214 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1215 thread->set_privileged_stack_top(&pi);
1216 }
1217
1218
1219 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1220 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1221 Handle pending_exception;
1222 JavaValue result(T_OBJECT);
1223 JavaCallArguments args(object);
1224 JavaCalls::call(&result, m, &args, THREAD);
1225
1226 // done with action, remove ourselves from the list
1227 if (!vfst.at_end()) {
1228 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1229 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1230 }
1231
1232 if (HAS_PENDING_EXCEPTION) {
1233 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1234 CLEAR_PENDING_EXCEPTION;
1235 // JVMTI has already reported the pending exception
1236 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1237 if (THREAD->is_Java_thread()) {
1238 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1239 }
1240 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1241 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1242 // Throw a java.security.PrivilegedActionException(Exception e) exception
1243 JavaCallArguments args(pending_exception);
1244 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1245 vmSymbols::exception_void_signature(),
1246 &args);
1247 }
1248 }
1249
1250 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1251 return JNIHandles::make_local(env, (oop) result.get_jobject());
1252 JVM_END
1253
1254
1255 // Returns the inherited_access_control_context field of the running thread.
1256 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1257 JVMWrapper("JVM_GetInheritedAccessControlContext");
1258 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1259 return JNIHandles::make_local(env, result);
1260 JVM_END
1261
1262 class RegisterArrayForGC {
1263 private:
1264 JavaThread *_thread;
1265 public:
1266 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1267 _thread = thread;
1268 _thread->register_array_for_gc(array);
1269 }
1270
1271 ~RegisterArrayForGC() {
1272 _thread->register_array_for_gc(NULL);
1273 }
1274 };
1275
1276
1277 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1278 JVMWrapper("JVM_GetStackAccessControlContext");
1279 if (!UsePrivilegedStack) return NULL;
1280
1281 ResourceMark rm(THREAD);
1282 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1283 JvmtiVMObjectAllocEventCollector oam;
1284
1285 // count the protection domains on the execution stack. We collapse
1286 // duplicate consecutive protection domains into a single one, as
1287 // well as stopping when we hit a privileged frame.
1288
1289 // Use vframeStream to iterate through Java frames
1290 vframeStream vfst(thread);
1291
1292 oop previous_protection_domain = NULL;
1293 Handle privileged_context(thread, NULL);
1294 bool is_privileged = false;
1295 oop protection_domain = NULL;
1296
1297 for(; !vfst.at_end(); vfst.next()) {
1298 // get method of frame
1299 Method* method = vfst.method();
1300 intptr_t* frame_id = vfst.frame_id();
1301
1302 // check the privileged frames to see if we have a match
1303 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1304 // this frame is privileged
1305 is_privileged = true;
1306 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1307 protection_domain = thread->privileged_stack_top()->protection_domain();
1308 } else {
1309 protection_domain = method->method_holder()->protection_domain();
1310 }
1311
1312 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1313 local_array->push(protection_domain);
1314 previous_protection_domain = protection_domain;
1315 }
1316
1317 if (is_privileged) break;
1318 }
1319
1320
1321 // either all the domains on the stack were system domains, or
1322 // we had a privileged system domain
1323 if (local_array->is_empty()) {
1324 if (is_privileged && privileged_context.is_null()) return NULL;
1325
1326 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1327 return JNIHandles::make_local(env, result);
1328 }
1329
1330 // the resource area must be registered in case of a gc
1331 RegisterArrayForGC ragc(thread, local_array);
1332 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1333 local_array->length(), CHECK_NULL);
1334 objArrayHandle h_context(thread, context);
1335 for (int index = 0; index < local_array->length(); index++) {
1336 h_context->obj_at_put(index, local_array->at(index));
1337 }
1338
1339 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1340
1341 return JNIHandles::make_local(env, result);
1342 JVM_END
1343
1344
1345 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1346 JVMWrapper("JVM_IsArrayClass");
1347 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1348 return (k != NULL) && k->is_array_klass() ? true : false;
1349 JVM_END
1350
1351
1352 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1353 JVMWrapper("JVM_IsPrimitiveClass");
1354 oop mirror = JNIHandles::resolve_non_null(cls);
1355 return (jboolean) java_lang_Class::is_primitive(mirror);
1356 JVM_END
1357
1358
1359 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1360 JVMWrapper("JVM_GetClassModifiers");
1361 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1362 // Primitive type
1363 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1364 }
1365
1366 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1367 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1368 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1369 return k->modifier_flags();
1370 JVM_END
1371
1372
1373 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1374
1375 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1376 JvmtiVMObjectAllocEventCollector oam;
1377 // ofClass is a reference to a java_lang_Class object. The mirror object
1378 // of an InstanceKlass
1379
1380 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1381 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1382 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1383 return (jobjectArray)JNIHandles::make_local(env, result);
1384 }
1385
1386 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1387 InnerClassesIterator iter(k);
1388
1389 if (iter.length() == 0) {
1390 // Neither an inner nor outer class
1391 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1392 return (jobjectArray)JNIHandles::make_local(env, result);
1393 }
1394
1395 // find inner class info
1396 constantPoolHandle cp(thread, k->constants());
1397 int length = iter.length();
1398
1399 // Allocate temp. result array
1400 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1401 objArrayHandle result (THREAD, r);
1402 int members = 0;
1403
1404 for (; !iter.done(); iter.next()) {
1405 int ioff = iter.inner_class_info_index();
1406 int ooff = iter.outer_class_info_index();
1407
1408 if (ioff != 0 && ooff != 0) {
1409 // Check to see if the name matches the class we're looking for
1410 // before attempting to find the class.
1411 if (cp->klass_name_at_matches(k, ooff)) {
1412 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1413 if (outer_klass == k()) {
1414 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1415 instanceKlassHandle inner_klass (THREAD, ik);
1416
1417 // Throws an exception if outer klass has not declared k as
1418 // an inner klass
1419 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1420
1421 result->obj_at_put(members, inner_klass->java_mirror());
1422 members++;
1423 }
1424 }
1425 }
1426 }
1427
1428 if (members != length) {
1429 // Return array of right length
1430 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1431 for(int i = 0; i < members; i++) {
1432 res->obj_at_put(i, result->obj_at(i));
1433 }
1434 return (jobjectArray)JNIHandles::make_local(env, res);
1435 }
1436
1437 return (jobjectArray)JNIHandles::make_local(env, result());
1438 JVM_END
1439
1440
1441 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1442 {
1443 // ofClass is a reference to a java_lang_Class object.
1444 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1445 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1446 return NULL;
1447 }
1448
1449 bool inner_is_member = false;
1450 Klass* outer_klass
1451 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1452 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1453 if (outer_klass == NULL) return NULL; // already a top-level class
1454 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1455 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1456 }
1457 JVM_END
1458
1459 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1460 {
1461 oop mirror = JNIHandles::resolve_non_null(cls);
1462 if (java_lang_Class::is_primitive(mirror) ||
1463 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1464 return NULL;
1465 }
1466 instanceKlassHandle k(THREAD, InstanceKlass::cast(java_lang_Class::as_Klass(mirror)));
1467 int ooff = 0, noff = 0;
1468 if (InstanceKlass::find_inner_classes_attr(k, &ooff, &noff, THREAD)) {
1469 if (noff != 0) {
1470 constantPoolHandle i_cp(thread, k->constants());
1471 Symbol* name = i_cp->symbol_at(noff);
1472 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1473 return (jstring) JNIHandles::make_local(env, str());
1474 }
1475 }
1476 return NULL;
1477 }
1478 JVM_END
1479
1480 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1481 assert (cls != NULL, "illegal class");
1482 JVMWrapper("JVM_GetClassSignature");
1483 JvmtiVMObjectAllocEventCollector oam;
1484 ResourceMark rm(THREAD);
1485 // Return null for arrays and primatives
1486 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1487 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1488 if (k->is_instance_klass()) {
1489 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1490 if (sym == NULL) return NULL;
1491 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1492 return (jstring) JNIHandles::make_local(env, str());
1493 }
1494 }
1495 return NULL;
1496 JVM_END
1497
1498
1499 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1500 assert (cls != NULL, "illegal class");
1501 JVMWrapper("JVM_GetClassAnnotations");
1502
1503 // Return null for arrays and primitives
1504 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1505 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1506 if (k->is_instance_klass()) {
1507 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1508 return (jbyteArray) JNIHandles::make_local(env, a);
1509 }
1510 }
1511 return NULL;
1512 JVM_END
1513
1514
1515 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1516 // some of this code was adapted from from jni_FromReflectedField
1517
1518 oop reflected = JNIHandles::resolve_non_null(field);
1519 oop mirror = java_lang_reflect_Field::clazz(reflected);
1520 Klass* k = java_lang_Class::as_Klass(mirror);
1521 int slot = java_lang_reflect_Field::slot(reflected);
1522 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1523
1524 KlassHandle kh(THREAD, k);
1525 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1526
1527 if (modifiers & JVM_ACC_STATIC) {
1528 // for static fields we only look in the current class
1529 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1530 assert(false, "cannot find static field");
1531 return false;
1532 }
1533 } else {
1534 // for instance fields we start with the current class and work
1535 // our way up through the superclass chain
1536 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1537 assert(false, "cannot find instance field");
1538 return false;
1539 }
1540 }
1541 return true;
1542 }
1543
1544 static Method* jvm_get_method_common(jobject method) {
1545 // some of this code was adapted from from jni_FromReflectedMethod
1546
1547 oop reflected = JNIHandles::resolve_non_null(method);
1548 oop mirror = NULL;
1549 int slot = 0;
1550
1551 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1552 mirror = java_lang_reflect_Constructor::clazz(reflected);
1553 slot = java_lang_reflect_Constructor::slot(reflected);
1554 } else {
1555 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1556 "wrong type");
1557 mirror = java_lang_reflect_Method::clazz(reflected);
1558 slot = java_lang_reflect_Method::slot(reflected);
1559 }
1560 Klass* k = java_lang_Class::as_Klass(mirror);
1561
1562 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1563 assert(m != NULL, "cannot find method");
1564 return m; // caller has to deal with NULL in product mode
1565 }
1566
1567 /* Type use annotations support (JDK 1.8) */
1568
1569 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1570 assert (cls != NULL, "illegal class");
1571 JVMWrapper("JVM_GetClassTypeAnnotations");
1572 ResourceMark rm(THREAD);
1573 // Return null for arrays and primitives
1574 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1575 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1576 if (k->is_instance_klass()) {
1577 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1578 if (type_annotations != NULL) {
1579 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1580 return (jbyteArray) JNIHandles::make_local(env, a);
1581 }
1582 }
1583 }
1584 return NULL;
1585 JVM_END
1586
1587 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1588 assert (method != NULL, "illegal method");
1589 JVMWrapper("JVM_GetMethodTypeAnnotations");
1590
1591 // method is a handle to a java.lang.reflect.Method object
1592 Method* m = jvm_get_method_common(method);
1593 if (m == NULL) {
1594 return NULL;
1595 }
1596
1597 AnnotationArray* type_annotations = m->type_annotations();
1598 if (type_annotations != NULL) {
1599 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1600 return (jbyteArray) JNIHandles::make_local(env, a);
1601 }
1602
1603 return NULL;
1604 JVM_END
1605
1606 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1607 assert (field != NULL, "illegal field");
1608 JVMWrapper("JVM_GetFieldTypeAnnotations");
1609
1610 fieldDescriptor fd;
1611 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1612 if (!gotFd) {
1613 return NULL;
1614 }
1615
1616 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1617 JVM_END
1618
1619 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1620 if (!cp->is_within_bounds(index)) {
1621 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1622 }
1623 }
1624
1625 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1626 {
1627 JVMWrapper("JVM_GetMethodParameters");
1628 // method is a handle to a java.lang.reflect.Method object
1629 Method* method_ptr = jvm_get_method_common(method);
1630 methodHandle mh (THREAD, method_ptr);
1631 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1632 const int num_params = mh->method_parameters_length();
1633
1634 if (num_params < 0) {
1635 // A -1 return value from method_parameters_length means there is no
1636 // parameter data. Return null to indicate this to the reflection
1637 // API.
1638 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1639 return (jobjectArray)NULL;
1640 } else {
1641 // Otherwise, we return something up to reflection, even if it is
1642 // a zero-length array. Why? Because in some cases this can
1643 // trigger a MalformedParametersException.
1644
1645 // make sure all the symbols are properly formatted
1646 for (int i = 0; i < num_params; i++) {
1647 MethodParametersElement* params = mh->method_parameters_start();
1648 int index = params[i].name_cp_index;
1649 bounds_check(mh->constants(), index, CHECK_NULL);
1650
1651 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1652 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1653 "Wrong type at constant pool index");
1654 }
1655
1656 }
1657
1658 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1659 objArrayHandle result (THREAD, result_oop);
1660
1661 for (int i = 0; i < num_params; i++) {
1662 MethodParametersElement* params = mh->method_parameters_start();
1663 // For a 0 index, give a NULL symbol
1664 Symbol* sym = 0 != params[i].name_cp_index ?
1665 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1666 int flags = params[i].flags;
1667 oop param = Reflection::new_parameter(reflected_method, i, sym,
1668 flags, CHECK_NULL);
1669 result->obj_at_put(i, param);
1670 }
1671 return (jobjectArray)JNIHandles::make_local(env, result());
1672 }
1673 }
1674 JVM_END
1675
1676 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1677
1678 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1679 {
1680 JVMWrapper("JVM_GetClassDeclaredFields");
1681 JvmtiVMObjectAllocEventCollector oam;
1682
1683 // Exclude primitive types and array types
1684 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1685 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1686 // Return empty array
1687 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1688 return (jobjectArray) JNIHandles::make_local(env, res);
1689 }
1690
1691 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1692 constantPoolHandle cp(THREAD, k->constants());
1693
1694 // Ensure class is linked
1695 k->link_class(CHECK_NULL);
1696
1697 // 4496456 We need to filter out java.lang.Throwable.backtrace
1698 bool skip_backtrace = false;
1699
1700 // Allocate result
1701 int num_fields;
1702
1703 if (publicOnly) {
1704 num_fields = 0;
1705 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
1706 if (fs.access_flags().is_public()) ++num_fields;
1707 }
1708 } else {
1709 num_fields = k->java_fields_count();
1710
1711 if (k() == SystemDictionary::Throwable_klass()) {
1712 num_fields--;
1713 skip_backtrace = true;
1714 }
1715 }
1716
1717 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1718 objArrayHandle result (THREAD, r);
1719
1720 int out_idx = 0;
1721 fieldDescriptor fd;
1722 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1723 if (skip_backtrace) {
1724 // 4496456 skip java.lang.Throwable.backtrace
1725 int offset = fs.offset();
1726 if (offset == java_lang_Throwable::get_backtrace_offset()) continue;
1727 }
1728
1729 if (!publicOnly || fs.access_flags().is_public()) {
1730 fd.reinitialize(k(), fs.index());
1731 oop field = Reflection::new_field(&fd, CHECK_NULL);
1732 result->obj_at_put(out_idx, field);
1733 ++out_idx;
1734 }
1735 }
1736 assert(out_idx == num_fields, "just checking");
1737 return (jobjectArray) JNIHandles::make_local(env, result());
1738 }
1739 JVM_END
1740
1741 static bool select_method(methodHandle method, bool want_constructor) {
1742 if (want_constructor) {
1743 return (method->is_initializer() && !method->is_static());
1744 } else {
1745 return (!method->is_initializer() && !method->is_overpass());
1746 }
1747 }
1748
1749 static jobjectArray get_class_declared_methods_helper(
1750 JNIEnv *env,
1751 jclass ofClass, jboolean publicOnly,
1752 bool want_constructor,
1753 Klass* klass, TRAPS) {
1754
1755 JvmtiVMObjectAllocEventCollector oam;
1756
1757 // Exclude primitive types and array types
1758 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1759 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1760 // Return empty array
1761 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1762 return (jobjectArray) JNIHandles::make_local(env, res);
1763 }
1764
1765 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1766
1767 // Ensure class is linked
1768 k->link_class(CHECK_NULL);
1769
1770 Array<Method*>* methods = k->methods();
1771 int methods_length = methods->length();
1772
1773 // Save original method_idnum in case of redefinition, which can change
1774 // the idnum of obsolete methods. The new method will have the same idnum
1775 // but if we refresh the methods array, the counts will be wrong.
1776 ResourceMark rm(THREAD);
1777 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1778 int num_methods = 0;
1779
1780 for (int i = 0; i < methods_length; i++) {
1781 methodHandle method(THREAD, methods->at(i));
1782 if (select_method(method, want_constructor)) {
1783 if (!publicOnly || method->is_public()) {
1784 idnums->push(method->method_idnum());
1785 ++num_methods;
1786 }
1787 }
1788 }
1789
1790 // Allocate result
1791 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1792 objArrayHandle result (THREAD, r);
1793
1794 // Now just put the methods that we selected above, but go by their idnum
1795 // in case of redefinition. The methods can be redefined at any safepoint,
1796 // so above when allocating the oop array and below when creating reflect
1797 // objects.
1798 for (int i = 0; i < num_methods; i++) {
1799 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1800 if (method.is_null()) {
1801 // Method may have been deleted and seems this API can handle null
1802 // Otherwise should probably put a method that throws NSME
1803 result->obj_at_put(i, NULL);
1804 } else {
1805 oop m;
1806 if (want_constructor) {
1807 m = Reflection::new_constructor(method, CHECK_NULL);
1808 } else {
1809 m = Reflection::new_method(method, false, CHECK_NULL);
1810 }
1811 result->obj_at_put(i, m);
1812 }
1813 }
1814
1815 return (jobjectArray) JNIHandles::make_local(env, result());
1816 }
1817
1818 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1819 {
1820 JVMWrapper("JVM_GetClassDeclaredMethods");
1821 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1822 /*want_constructor*/ false,
1823 SystemDictionary::reflect_Method_klass(), THREAD);
1824 }
1825 JVM_END
1826
1827 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1828 {
1829 JVMWrapper("JVM_GetClassDeclaredConstructors");
1830 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1831 /*want_constructor*/ true,
1832 SystemDictionary::reflect_Constructor_klass(), THREAD);
1833 }
1834 JVM_END
1835
1836 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1837 {
1838 JVMWrapper("JVM_GetClassAccessFlags");
1839 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1840 // Primitive type
1841 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1842 }
1843
1844 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1845 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1846 }
1847 JVM_END
1848
1849
1850 // Constant pool access //////////////////////////////////////////////////////////
1851
1852 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1853 {
1854 JVMWrapper("JVM_GetClassConstantPool");
1855 JvmtiVMObjectAllocEventCollector oam;
1856
1857 // Return null for primitives and arrays
1858 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1859 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1860 if (k->is_instance_klass()) {
1861 instanceKlassHandle k_h(THREAD, k);
1862 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL);
1863 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1864 return JNIHandles::make_local(jcp());
1865 }
1866 }
1867 return NULL;
1868 }
1869 JVM_END
1870
1871
1872 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1873 {
1874 JVMWrapper("JVM_ConstantPoolGetSize");
1875 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1876 return cp->length();
1877 }
1878 JVM_END
1879
1880
1881 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1882 {
1883 JVMWrapper("JVM_ConstantPoolGetClassAt");
1884 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1885 bounds_check(cp, index, CHECK_NULL);
1886 constantTag tag = cp->tag_at(index);
1887 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1888 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1889 }
1890 Klass* k = cp->klass_at(index, CHECK_NULL);
1891 return (jclass) JNIHandles::make_local(k->java_mirror());
1892 }
1893 JVM_END
1894
1895 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1896 {
1897 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1898 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1899 bounds_check(cp, index, CHECK_NULL);
1900 constantTag tag = cp->tag_at(index);
1901 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1902 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1903 }
1904 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1905 if (k == NULL) return NULL;
1906 return (jclass) JNIHandles::make_local(k->java_mirror());
1907 }
1908 JVM_END
1909
1910 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1911 constantTag tag = cp->tag_at(index);
1912 if (!tag.is_method() && !tag.is_interface_method()) {
1913 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1914 }
1915 int klass_ref = cp->uncached_klass_ref_index_at(index);
1916 Klass* k_o;
1917 if (force_resolution) {
1918 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1919 } else {
1920 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1921 if (k_o == NULL) return NULL;
1922 }
1923 instanceKlassHandle k(THREAD, k_o);
1924 Symbol* name = cp->uncached_name_ref_at(index);
1925 Symbol* sig = cp->uncached_signature_ref_at(index);
1926 methodHandle m (THREAD, k->find_method(name, sig));
1927 if (m.is_null()) {
1928 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1929 }
1930 oop method;
1931 if (!m->is_initializer() || m->is_static()) {
1932 method = Reflection::new_method(m, true, CHECK_NULL);
1933 } else {
1934 method = Reflection::new_constructor(m, CHECK_NULL);
1935 }
1936 return JNIHandles::make_local(method);
1937 }
1938
1939 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1940 {
1941 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1942 JvmtiVMObjectAllocEventCollector oam;
1943 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1944 bounds_check(cp, index, CHECK_NULL);
1945 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1946 return res;
1947 }
1948 JVM_END
1949
1950 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1951 {
1952 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1953 JvmtiVMObjectAllocEventCollector oam;
1954 constantPoolHandle cp = constantPoolHandle(THREAD, 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, false, CHECK_NULL);
1957 return res;
1958 }
1959 JVM_END
1960
1961 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1962 constantTag tag = cp->tag_at(index);
1963 if (!tag.is_field()) {
1964 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1965 }
1966 int klass_ref = cp->uncached_klass_ref_index_at(index);
1967 Klass* k_o;
1968 if (force_resolution) {
1969 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1970 } else {
1971 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1972 if (k_o == NULL) return NULL;
1973 }
1974 instanceKlassHandle k(THREAD, k_o);
1975 Symbol* name = cp->uncached_name_ref_at(index);
1976 Symbol* sig = cp->uncached_signature_ref_at(index);
1977 fieldDescriptor fd;
1978 Klass* target_klass = k->find_field(name, sig, &fd);
1979 if (target_klass == NULL) {
1980 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
1981 }
1982 oop field = Reflection::new_field(&fd, CHECK_NULL);
1983 return JNIHandles::make_local(field);
1984 }
1985
1986 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
1987 {
1988 JVMWrapper("JVM_ConstantPoolGetFieldAt");
1989 JvmtiVMObjectAllocEventCollector oam;
1990 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1991 bounds_check(cp, index, CHECK_NULL);
1992 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
1993 return res;
1994 }
1995 JVM_END
1996
1997 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1998 {
1999 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2000 JvmtiVMObjectAllocEventCollector oam;
2001 constantPoolHandle cp = constantPoolHandle(THREAD, 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, false, CHECK_NULL);
2004 return res;
2005 }
2006 JVM_END
2007
2008 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2009 {
2010 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2011 JvmtiVMObjectAllocEventCollector oam;
2012 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2013 bounds_check(cp, index, CHECK_NULL);
2014 constantTag tag = cp->tag_at(index);
2015 if (!tag.is_field_or_method()) {
2016 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2017 }
2018 int klass_ref = cp->uncached_klass_ref_index_at(index);
2019 Symbol* klass_name = cp->klass_name_at(klass_ref);
2020 Symbol* member_name = cp->uncached_name_ref_at(index);
2021 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2022 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2023 objArrayHandle dest(THREAD, dest_o);
2024 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2025 dest->obj_at_put(0, str());
2026 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2027 dest->obj_at_put(1, str());
2028 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2029 dest->obj_at_put(2, str());
2030 return (jobjectArray) JNIHandles::make_local(dest());
2031 }
2032 JVM_END
2033
2034 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2035 {
2036 JVMWrapper("JVM_ConstantPoolGetIntAt");
2037 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2038 bounds_check(cp, index, CHECK_0);
2039 constantTag tag = cp->tag_at(index);
2040 if (!tag.is_int()) {
2041 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2042 }
2043 return cp->int_at(index);
2044 }
2045 JVM_END
2046
2047 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2048 {
2049 JVMWrapper("JVM_ConstantPoolGetLongAt");
2050 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2051 bounds_check(cp, index, CHECK_(0L));
2052 constantTag tag = cp->tag_at(index);
2053 if (!tag.is_long()) {
2054 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2055 }
2056 return cp->long_at(index);
2057 }
2058 JVM_END
2059
2060 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2061 {
2062 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2063 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2064 bounds_check(cp, index, CHECK_(0.0f));
2065 constantTag tag = cp->tag_at(index);
2066 if (!tag.is_float()) {
2067 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2068 }
2069 return cp->float_at(index);
2070 }
2071 JVM_END
2072
2073 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2074 {
2075 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2076 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2077 bounds_check(cp, index, CHECK_(0.0));
2078 constantTag tag = cp->tag_at(index);
2079 if (!tag.is_double()) {
2080 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2081 }
2082 return cp->double_at(index);
2083 }
2084 JVM_END
2085
2086 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2087 {
2088 JVMWrapper("JVM_ConstantPoolGetStringAt");
2089 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2090 bounds_check(cp, index, CHECK_NULL);
2091 constantTag tag = cp->tag_at(index);
2092 if (!tag.is_string()) {
2093 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2094 }
2095 oop str = cp->string_at(index, CHECK_NULL);
2096 return (jstring) JNIHandles::make_local(str);
2097 }
2098 JVM_END
2099
2100 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2101 {
2102 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2103 JvmtiVMObjectAllocEventCollector oam;
2104 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2105 bounds_check(cp, index, CHECK_NULL);
2106 constantTag tag = cp->tag_at(index);
2107 if (!tag.is_symbol()) {
2108 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2109 }
2110 Symbol* sym = cp->symbol_at(index);
2111 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2112 return (jstring) JNIHandles::make_local(str());
2113 }
2114 JVM_END
2115
2116
2117 // Assertion support. //////////////////////////////////////////////////////////
2118
2119 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2120 JVMWrapper("JVM_DesiredAssertionStatus");
2121 assert(cls != NULL, "bad class");
2122
2123 oop r = JNIHandles::resolve(cls);
2124 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2125 if (java_lang_Class::is_primitive(r)) return false;
2126
2127 Klass* k = java_lang_Class::as_Klass(r);
2128 assert(k->is_instance_klass(), "must be an instance klass");
2129 if (!k->is_instance_klass()) return false;
2130
2131 ResourceMark rm(THREAD);
2132 const char* name = k->name()->as_C_string();
2133 bool system_class = k->class_loader() == NULL;
2134 return JavaAssertions::enabled(name, system_class);
2135
2136 JVM_END
2137
2138
2139 // Return a new AssertionStatusDirectives object with the fields filled in with
2140 // command-line assertion arguments (i.e., -ea, -da).
2141 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2142 JVMWrapper("JVM_AssertionStatusDirectives");
2143 JvmtiVMObjectAllocEventCollector oam;
2144 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2145 return JNIHandles::make_local(env, asd);
2146 JVM_END
2147
2148 // Verification ////////////////////////////////////////////////////////////////////////////////
2149
2150 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2151
2152 // RedefineClasses support: bug 6214132 caused verification to fail.
2153 // All functions from this section should call the jvmtiThreadSate function:
2154 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2155 // The function returns a Klass* of the _scratch_class if the verifier
2156 // was invoked in the middle of the class redefinition.
2157 // Otherwise it returns its argument value which is the _the_class Klass*.
2158 // Please, refer to the description in the jvmtiThreadSate.hpp.
2159
2160 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2161 JVMWrapper("JVM_GetClassNameUTF");
2162 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2163 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2164 return k->name()->as_utf8();
2165 JVM_END
2166
2167
2168 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2169 JVMWrapper("JVM_GetClassCPTypes");
2170 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2171 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2172 // types will have length zero if this is not an InstanceKlass
2173 // (length is determined by call to JVM_GetClassCPEntriesCount)
2174 if (k->is_instance_klass()) {
2175 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2176 for (int index = cp->length() - 1; index >= 0; index--) {
2177 constantTag tag = cp->tag_at(index);
2178 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2179 }
2180 }
2181 JVM_END
2182
2183
2184 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2185 JVMWrapper("JVM_GetClassCPEntriesCount");
2186 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2187 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2188 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2189 JVM_END
2190
2191
2192 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2193 JVMWrapper("JVM_GetClassFieldsCount");
2194 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2195 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2196 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2197 JVM_END
2198
2199
2200 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2201 JVMWrapper("JVM_GetClassMethodsCount");
2202 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2203 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2204 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2205 JVM_END
2206
2207
2208 // The following methods, used for the verifier, are never called with
2209 // array klasses, so a direct cast to InstanceKlass is safe.
2210 // Typically, these methods are called in a loop with bounds determined
2211 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2212 // zero for arrays.
2213 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2214 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2215 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2216 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2217 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2218 int length = method->checked_exceptions_length();
2219 if (length > 0) {
2220 CheckedExceptionElement* table= method->checked_exceptions_start();
2221 for (int i = 0; i < length; i++) {
2222 exceptions[i] = table[i].class_cp_index;
2223 }
2224 }
2225 JVM_END
2226
2227
2228 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2229 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2230 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2231 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2232 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2233 return method->checked_exceptions_length();
2234 JVM_END
2235
2236
2237 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2238 JVMWrapper("JVM_GetMethodIxByteCode");
2239 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2240 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2241 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2242 memcpy(code, method->code_base(), method->code_size());
2243 JVM_END
2244
2245
2246 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2247 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2248 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2249 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2250 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2251 return method->code_size();
2252 JVM_END
2253
2254
2255 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2256 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2257 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2258 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2259 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2260 ExceptionTable extable(method);
2261 entry->start_pc = extable.start_pc(entry_index);
2262 entry->end_pc = extable.end_pc(entry_index);
2263 entry->handler_pc = extable.handler_pc(entry_index);
2264 entry->catchType = extable.catch_type_index(entry_index);
2265 JVM_END
2266
2267
2268 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2269 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2270 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2271 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2272 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2273 return method->exception_table_length();
2274 JVM_END
2275
2276
2277 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2278 JVMWrapper("JVM_GetMethodIxModifiers");
2279 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2280 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2281 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2282 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2283 JVM_END
2284
2285
2286 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2287 JVMWrapper("JVM_GetFieldIxModifiers");
2288 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2289 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2290 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2291 JVM_END
2292
2293
2294 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2295 JVMWrapper("JVM_GetMethodIxLocalsCount");
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->max_locals();
2300 JVM_END
2301
2302
2303 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2304 JVMWrapper("JVM_GetMethodIxArgsSize");
2305 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2306 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2307 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2308 return method->size_of_parameters();
2309 JVM_END
2310
2311
2312 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2313 JVMWrapper("JVM_GetMethodIxMaxStack");
2314 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2315 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2316 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2317 return method->verifier_max_stack();
2318 JVM_END
2319
2320
2321 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2322 JVMWrapper("JVM_IsConstructorIx");
2323 ResourceMark rm(THREAD);
2324 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2325 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2326 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2327 return method->name() == vmSymbols::object_initializer_name();
2328 JVM_END
2329
2330
2331 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2332 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2333 ResourceMark rm(THREAD);
2334 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2335 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2336 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2337 return method->is_overpass();
2338 JVM_END
2339
2340 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2341 JVMWrapper("JVM_GetMethodIxIxUTF");
2342 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2343 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2344 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2345 return method->name()->as_utf8();
2346 JVM_END
2347
2348
2349 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2350 JVMWrapper("JVM_GetMethodIxSignatureUTF");
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->signature()->as_utf8();
2355 JVM_END
2356
2357 /**
2358 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2359 * read entries in the constant pool. Since the old verifier always
2360 * works on a copy of the code, it will not see any rewriting that
2361 * may possibly occur in the middle of verification. So it is important
2362 * that nothing it calls tries to use the cpCache instead of the raw
2363 * constant pool, so we must use cp->uncached_x methods when appropriate.
2364 */
2365 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2366 JVMWrapper("JVM_GetCPFieldNameUTF");
2367 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2368 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2369 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2370 switch (cp->tag_at(cp_index).value()) {
2371 case JVM_CONSTANT_Fieldref:
2372 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2373 default:
2374 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2375 }
2376 ShouldNotReachHere();
2377 return NULL;
2378 JVM_END
2379
2380
2381 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2382 JVMWrapper("JVM_GetCPMethodNameUTF");
2383 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2384 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2385 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2386 switch (cp->tag_at(cp_index).value()) {
2387 case JVM_CONSTANT_InterfaceMethodref:
2388 case JVM_CONSTANT_Methodref:
2389 case JVM_CONSTANT_NameAndType: // for invokedynamic
2390 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2391 default:
2392 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2393 }
2394 ShouldNotReachHere();
2395 return NULL;
2396 JVM_END
2397
2398
2399 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2400 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2401 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2402 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2403 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2404 switch (cp->tag_at(cp_index).value()) {
2405 case JVM_CONSTANT_InterfaceMethodref:
2406 case JVM_CONSTANT_Methodref:
2407 case JVM_CONSTANT_NameAndType: // for invokedynamic
2408 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2409 default:
2410 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2411 }
2412 ShouldNotReachHere();
2413 return NULL;
2414 JVM_END
2415
2416
2417 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2418 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2419 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2420 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2421 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2422 switch (cp->tag_at(cp_index).value()) {
2423 case JVM_CONSTANT_Fieldref:
2424 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2425 default:
2426 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2427 }
2428 ShouldNotReachHere();
2429 return NULL;
2430 JVM_END
2431
2432
2433 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2434 JVMWrapper("JVM_GetCPClassNameUTF");
2435 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2436 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2437 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2438 Symbol* classname = cp->klass_name_at(cp_index);
2439 return classname->as_utf8();
2440 JVM_END
2441
2442
2443 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2444 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2445 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2446 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2447 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2448 switch (cp->tag_at(cp_index).value()) {
2449 case JVM_CONSTANT_Fieldref: {
2450 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2451 Symbol* classname = cp->klass_name_at(class_index);
2452 return classname->as_utf8();
2453 }
2454 default:
2455 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2456 }
2457 ShouldNotReachHere();
2458 return NULL;
2459 JVM_END
2460
2461
2462 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2463 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2464 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2465 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2466 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2467 switch (cp->tag_at(cp_index).value()) {
2468 case JVM_CONSTANT_Methodref:
2469 case JVM_CONSTANT_InterfaceMethodref: {
2470 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2471 Symbol* classname = cp->klass_name_at(class_index);
2472 return classname->as_utf8();
2473 }
2474 default:
2475 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2476 }
2477 ShouldNotReachHere();
2478 return NULL;
2479 JVM_END
2480
2481
2482 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2483 JVMWrapper("JVM_GetCPFieldModifiers");
2484 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2485 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2486 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2487 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2488 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2489 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2490 switch (cp->tag_at(cp_index).value()) {
2491 case JVM_CONSTANT_Fieldref: {
2492 Symbol* name = cp->uncached_name_ref_at(cp_index);
2493 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2494 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2495 if (fs.name() == name && fs.signature() == signature) {
2496 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2497 }
2498 }
2499 return -1;
2500 }
2501 default:
2502 fatal("JVM_GetCPFieldModifiers: illegal constant");
2503 }
2504 ShouldNotReachHere();
2505 return 0;
2506 JVM_END
2507
2508
2509 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2510 JVMWrapper("JVM_GetCPMethodModifiers");
2511 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2512 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2513 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2514 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2515 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2516 switch (cp->tag_at(cp_index).value()) {
2517 case JVM_CONSTANT_Methodref:
2518 case JVM_CONSTANT_InterfaceMethodref: {
2519 Symbol* name = cp->uncached_name_ref_at(cp_index);
2520 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2521 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2522 int methods_count = methods->length();
2523 for (int i = 0; i < methods_count; i++) {
2524 Method* method = methods->at(i);
2525 if (method->name() == name && method->signature() == signature) {
2526 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2527 }
2528 }
2529 return -1;
2530 }
2531 default:
2532 fatal("JVM_GetCPMethodModifiers: illegal constant");
2533 }
2534 ShouldNotReachHere();
2535 return 0;
2536 JVM_END
2537
2538
2539 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2540
2541 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2542 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2543 JVM_END
2544
2545
2546 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2547 JVMWrapper("JVM_IsSameClassPackage");
2548 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2549 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2550 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2551 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2552 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2553 JVM_END
2554
2555 // Printing support //////////////////////////////////////////////////
2556 extern "C" {
2557
2558 ATTRIBUTE_PRINTF(3, 0)
2559 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2560 // see bug 4399518, 4417214
2561 if ((intptr_t)count <= 0) return -1;
2562
2563 int result = vsnprintf(str, count, fmt, args);
2564 // Note: on truncation vsnprintf(3) on Unix returns numbers of
2565 // characters which would have been written had the buffer been large
2566 // enough; on Windows, it returns -1. We handle both cases here and
2567 // always return -1, and perform null termination.
2568 if ((result > 0 && (size_t)result >= count) || result == -1) {
2569 str[count - 1] = '\0';
2570 result = -1;
2571 }
2572
2573 return result;
2574 }
2575
2576 ATTRIBUTE_PRINTF(3, 0)
2577 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2578 va_list args;
2579 int len;
2580 va_start(args, fmt);
2581 len = jio_vsnprintf(str, count, fmt, args);
2582 va_end(args);
2583 return len;
2584 }
2585
2586 ATTRIBUTE_PRINTF(2,3)
2587 int jio_fprintf(FILE* f, const char *fmt, ...) {
2588 int len;
2589 va_list args;
2590 va_start(args, fmt);
2591 len = jio_vfprintf(f, fmt, args);
2592 va_end(args);
2593 return len;
2594 }
2595
2596 ATTRIBUTE_PRINTF(2, 0)
2597 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2598 if (Arguments::vfprintf_hook() != NULL) {
2599 return Arguments::vfprintf_hook()(f, fmt, args);
2600 } else {
2601 return vfprintf(f, fmt, args);
2602 }
2603 }
2604
2605 ATTRIBUTE_PRINTF(1, 2)
2606 JNIEXPORT int jio_printf(const char *fmt, ...) {
2607 int len;
2608 va_list args;
2609 va_start(args, fmt);
2610 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2611 va_end(args);
2612 return len;
2613 }
2614
2615
2616 // HotSpot specific jio method
2617 void jio_print(const char* s) {
2618 // Try to make this function as atomic as possible.
2619 if (Arguments::vfprintf_hook() != NULL) {
2620 jio_fprintf(defaultStream::output_stream(), "%s", s);
2621 } else {
2622 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2623 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
2624 }
2625 }
2626
2627 } // Extern C
2628
2629 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2630
2631 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
2632 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
2633 // OSThread objects. The exception to this rule is when the target object is the thread
2634 // doing the operation, in which case we know that the thread won't exit until the
2635 // operation is done (all exits being voluntary). There are a few cases where it is
2636 // rather silly to do operations on yourself, like resuming yourself or asking whether
2637 // you are alive. While these can still happen, they are not subject to deadlocks if
2638 // the lock is held while the operation occurs (this is not the case for suspend, for
2639 // instance), and are very unlikely. Because IsAlive needs to be fast and its
2640 // implementation is local to this file, we always lock Threads_lock for that one.
2641
2642 static void thread_entry(JavaThread* thread, TRAPS) {
2643 HandleMark hm(THREAD);
2644 Handle obj(THREAD, thread->threadObj());
2645 JavaValue result(T_VOID);
2646 JavaCalls::call_virtual(&result,
2647 obj,
2648 KlassHandle(THREAD, SystemDictionary::Thread_klass()),
2649 vmSymbols::run_method_name(),
2650 vmSymbols::void_method_signature(),
2651 THREAD);
2652 }
2653
2654
2655 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2656 JVMWrapper("JVM_StartThread");
2657 JavaThread *native_thread = NULL;
2658
2659 // We cannot hold the Threads_lock when we throw an exception,
2660 // due to rank ordering issues. Example: we might need to grab the
2661 // Heap_lock while we construct the exception.
2662 bool throw_illegal_thread_state = false;
2663
2664 // We must release the Threads_lock before we can post a jvmti event
2665 // in Thread::start.
2666 {
2667 // Ensure that the C++ Thread and OSThread structures aren't freed before
2668 // we operate.
2669 MutexLocker mu(Threads_lock);
2670
2671 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2672 // re-starting an already started thread, so we should usually find
2673 // that the JavaThread is null. However for a JNI attached thread
2674 // there is a small window between the Thread object being created
2675 // (with its JavaThread set) and the update to its threadStatus, so we
2676 // have to check for this
2677 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2678 throw_illegal_thread_state = true;
2679 } else {
2680 // We could also check the stillborn flag to see if this thread was already stopped, but
2681 // for historical reasons we let the thread detect that itself when it starts running
2682
2683 jlong size =
2684 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2685 // Allocate the C++ Thread structure and create the native thread. The
2686 // stack size retrieved from java is signed, but the constructor takes
2687 // size_t (an unsigned type), so avoid passing negative values which would
2688 // result in really large stacks.
2689 size_t sz = size > 0 ? (size_t) size : 0;
2690 native_thread = new JavaThread(&thread_entry, sz);
2691
2692 // At this point it may be possible that no osthread was created for the
2693 // JavaThread due to lack of memory. Check for this situation and throw
2694 // an exception if necessary. Eventually we may want to change this so
2695 // that we only grab the lock if the thread was created successfully -
2696 // then we can also do this check and throw the exception in the
2697 // JavaThread constructor.
2698 if (native_thread->osthread() != NULL) {
2699 // Note: the current thread is not being used within "prepare".
2700 native_thread->prepare(jthread);
2701 }
2702 }
2703 }
2704
2705 if (throw_illegal_thread_state) {
2706 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2707 }
2708
2709 assert(native_thread != NULL, "Starting null thread?");
2710
2711 if (native_thread->osthread() == NULL) {
2712 // No one should hold a reference to the 'native_thread'.
2713 delete native_thread;
2714 if (JvmtiExport::should_post_resource_exhausted()) {
2715 JvmtiExport::post_resource_exhausted(
2716 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2717 os::native_thread_creation_failed_msg());
2718 }
2719 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2720 os::native_thread_creation_failed_msg());
2721 }
2722
2723 Thread::start(native_thread);
2724
2725 JVM_END
2726
2727 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2728 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2729 // but is thought to be reliable and simple. In the case, where the receiver is the
2730 // same thread as the sender, no safepoint is needed.
2731 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2732 JVMWrapper("JVM_StopThread");
2733
2734 oop java_throwable = JNIHandles::resolve(throwable);
2735 if (java_throwable == NULL) {
2736 THROW(vmSymbols::java_lang_NullPointerException());
2737 }
2738 oop java_thread = JNIHandles::resolve_non_null(jthread);
2739 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2740 Events::log_exception(JavaThread::current(),
2741 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2742 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2743 // First check if thread is alive
2744 if (receiver != NULL) {
2745 // Check if exception is getting thrown at self (use oop equality, since the
2746 // target object might exit)
2747 if (java_thread == thread->threadObj()) {
2748 THROW_OOP(java_throwable);
2749 } else {
2750 // Enques a VM_Operation to stop all threads and then deliver the exception...
2751 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
2752 }
2753 }
2754 else {
2755 // Either:
2756 // - target thread has not been started before being stopped, or
2757 // - target thread already terminated
2758 // We could read the threadStatus to determine which case it is
2759 // but that is overkill as it doesn't matter. We must set the
2760 // stillborn flag for the first case, and if the thread has already
2761 // exited setting this flag has no affect
2762 java_lang_Thread::set_stillborn(java_thread);
2763 }
2764 JVM_END
2765
2766
2767 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2768 JVMWrapper("JVM_IsThreadAlive");
2769
2770 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2771 return java_lang_Thread::is_alive(thread_oop);
2772 JVM_END
2773
2774
2775 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2776 JVMWrapper("JVM_SuspendThread");
2777 oop java_thread = JNIHandles::resolve_non_null(jthread);
2778 JavaThread* receiver = java_lang_Thread::thread(java_thread);
2779
2780 if (receiver != NULL) {
2781 // thread has run and has not exited (still on threads list)
2782
2783 {
2784 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2785 if (receiver->is_external_suspend()) {
2786 // Don't allow nested external suspend requests. We can't return
2787 // an error from this interface so just ignore the problem.
2788 return;
2789 }
2790 if (receiver->is_exiting()) { // thread is in the process of exiting
2791 return;
2792 }
2793 receiver->set_external_suspend();
2794 }
2795
2796 // java_suspend() will catch threads in the process of exiting
2797 // and will ignore them.
2798 receiver->java_suspend();
2799
2800 // It would be nice to have the following assertion in all the
2801 // time, but it is possible for a racing resume request to have
2802 // resumed this thread right after we suspended it. Temporarily
2803 // enable this assertion if you are chasing a different kind of
2804 // bug.
2805 //
2806 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2807 // receiver->is_being_ext_suspended(), "thread is not suspended");
2808 }
2809 JVM_END
2810
2811
2812 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2813 JVMWrapper("JVM_ResumeThread");
2814 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
2815 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2816 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2817 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2818 // looks at it.
2819 MutexLocker ml(Threads_lock);
2820 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2821 if (thr != NULL) {
2822 // the thread has run and is not in the process of exiting
2823 thr->java_resume();
2824 }
2825 JVM_END
2826
2827
2828 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2829 JVMWrapper("JVM_SetThreadPriority");
2830 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2831 MutexLocker ml(Threads_lock);
2832 oop java_thread = JNIHandles::resolve_non_null(jthread);
2833 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2834 JavaThread* thr = java_lang_Thread::thread(java_thread);
2835 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
2836 Thread::set_priority(thr, (ThreadPriority)prio);
2837 }
2838 JVM_END
2839
2840
2841 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2842 JVMWrapper("JVM_Yield");
2843 if (os::dont_yield()) return;
2844 HOTSPOT_THREAD_YIELD();
2845
2846 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
2847 // Critical for similar threading behaviour
2848 if (ConvertYieldToSleep) {
2849 os::sleep(thread, MinSleepInterval, false);
2850 } else {
2851 os::naked_yield();
2852 }
2853 JVM_END
2854
2855
2856 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2857 JVMWrapper("JVM_Sleep");
2858
2859 if (millis < 0) {
2860 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2861 }
2862
2863 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2864 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2865 }
2866
2867 // Save current thread state and restore it at the end of this block.
2868 // And set new thread state to SLEEPING.
2869 JavaThreadSleepState jtss(thread);
2870
2871 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2872
2873 EventThreadSleep event;
2874
2875 if (millis == 0) {
2876 // When ConvertSleepToYield is on, this matches the classic VM implementation of
2877 // JVM_Sleep. Critical for similar threading behaviour (Win32)
2878 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
2879 // for SOLARIS
2880 if (ConvertSleepToYield) {
2881 os::naked_yield();
2882 } else {
2883 ThreadState old_state = thread->osthread()->get_state();
2884 thread->osthread()->set_state(SLEEPING);
2885 os::sleep(thread, MinSleepInterval, false);
2886 thread->osthread()->set_state(old_state);
2887 }
2888 } else {
2889 ThreadState old_state = thread->osthread()->get_state();
2890 thread->osthread()->set_state(SLEEPING);
2891 if (os::sleep(thread, millis, true) == OS_INTRPT) {
2892 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
2893 // us while we were sleeping. We do not overwrite those.
2894 if (!HAS_PENDING_EXCEPTION) {
2895 if (event.should_commit()) {
2896 event.set_time(millis);
2897 event.commit();
2898 }
2899 HOTSPOT_THREAD_SLEEP_END(1);
2900
2901 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2902 // to properly restore the thread state. That's likely wrong.
2903 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2904 }
2905 }
2906 thread->osthread()->set_state(old_state);
2907 }
2908 if (event.should_commit()) {
2909 event.set_time(millis);
2910 event.commit();
2911 }
2912 HOTSPOT_THREAD_SLEEP_END(0);
2913 JVM_END
2914
2915 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
2916 JVMWrapper("JVM_CurrentThread");
2917 oop jthread = thread->threadObj();
2918 assert (thread != NULL, "no current thread!");
2919 return JNIHandles::make_local(env, jthread);
2920 JVM_END
2921
2922
2923 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
2924 JVMWrapper("JVM_CountStackFrames");
2925
2926 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2927 oop java_thread = JNIHandles::resolve_non_null(jthread);
2928 bool throw_illegal_thread_state = false;
2929 int count = 0;
2930
2931 {
2932 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
2933 // We need to re-resolve the java_thread, since a GC might have happened during the
2934 // acquire of the lock
2935 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2936
2937 if (thr == NULL) {
2938 // do nothing
2939 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
2940 // Check whether this java thread has been suspended already. If not, throws
2941 // IllegalThreadStateException. We defer to throw that exception until
2942 // Threads_lock is released since loading exception class has to leave VM.
2943 // The correct way to test a thread is actually suspended is
2944 // wait_for_ext_suspend_completion(), but we can't call that while holding
2945 // the Threads_lock. The above tests are sufficient for our purposes
2946 // provided the walkability of the stack is stable - which it isn't
2947 // 100% but close enough for most practical purposes.
2948 throw_illegal_thread_state = true;
2949 } else {
2950 // Count all java activation, i.e., number of vframes
2951 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
2952 // Native frames are not counted
2953 if (!vfst.method()->is_native()) count++;
2954 }
2955 }
2956 }
2957
2958 if (throw_illegal_thread_state) {
2959 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
2960 "this thread is not suspended");
2961 }
2962 return count;
2963 JVM_END
2964
2965 // Consider: A better way to implement JVM_Interrupt() is to acquire
2966 // Threads_lock to resolve the jthread into a Thread pointer, fetch
2967 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
2968 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
2969 // outside the critical section. Threads_lock is hot so we want to minimize
2970 // the hold-time. A cleaner interface would be to decompose interrupt into
2971 // two steps. The 1st phase, performed under Threads_lock, would return
2972 // a closure that'd be invoked after Threads_lock was dropped.
2973 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
2974 // admit spurious wakeups.
2975
2976 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
2977 JVMWrapper("JVM_Interrupt");
2978
2979 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2980 oop java_thread = JNIHandles::resolve_non_null(jthread);
2981 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
2982 // We need to re-resolve the java_thread, since a GC might have happened during the
2983 // acquire of the lock
2984 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
2985 if (thr != NULL) {
2986 Thread::interrupt(thr);
2987 }
2988 JVM_END
2989
2990
2991 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
2992 JVMWrapper("JVM_IsInterrupted");
2993
2994 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
2995 oop java_thread = JNIHandles::resolve_non_null(jthread);
2996 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
2997 // We need to re-resolve the java_thread, since a GC might have happened during the
2998 // acquire of the lock
2999 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3000 if (thr == NULL) {
3001 return JNI_FALSE;
3002 } else {
3003 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3004 }
3005 JVM_END
3006
3007
3008 // Return true iff the current thread has locked the object passed in
3009
3010 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3011 JVMWrapper("JVM_HoldsLock");
3012 assert(THREAD->is_Java_thread(), "sanity check");
3013 if (obj == NULL) {
3014 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3015 }
3016 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3017 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3018 JVM_END
3019
3020
3021 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3022 JVMWrapper("JVM_DumpAllStacks");
3023 VM_PrintThreads op;
3024 VMThread::execute(&op);
3025 if (JvmtiExport::should_post_data_dump()) {
3026 JvmtiExport::post_data_dump();
3027 }
3028 JVM_END
3029
3030 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3031 JVMWrapper("JVM_SetNativeThreadName");
3032 ResourceMark rm(THREAD);
3033 oop java_thread = JNIHandles::resolve_non_null(jthread);
3034 JavaThread* thr = java_lang_Thread::thread(java_thread);
3035 // Thread naming only supported for the current thread, doesn't work for
3036 // target threads.
3037 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3038 // we don't set the name of an attached thread to avoid stepping
3039 // on other programs
3040 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3041 os::set_native_thread_name(thread_name);
3042 }
3043 JVM_END
3044
3045 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3046
3047 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3048 assert(jthread->is_Java_thread(), "must be a Java thread");
3049 if (jthread->privileged_stack_top() == NULL) return false;
3050 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3051 oop loader = jthread->privileged_stack_top()->class_loader();
3052 if (loader == NULL) return true;
3053 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3054 if (trusted) return true;
3055 }
3056 return false;
3057 }
3058
3059 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3060 JVMWrapper("JVM_CurrentLoadedClass");
3061 ResourceMark rm(THREAD);
3062
3063 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3064 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3065 bool trusted = is_trusted_frame(thread, &vfst);
3066 if (trusted) return NULL;
3067
3068 Method* m = vfst.method();
3069 if (!m->is_native()) {
3070 InstanceKlass* holder = m->method_holder();
3071 oop loader = holder->class_loader();
3072 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3073 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3074 }
3075 }
3076 }
3077 return NULL;
3078 JVM_END
3079
3080
3081 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3082 JVMWrapper("JVM_CurrentClassLoader");
3083 ResourceMark rm(THREAD);
3084
3085 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3086
3087 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3088 bool trusted = is_trusted_frame(thread, &vfst);
3089 if (trusted) return NULL;
3090
3091 Method* m = vfst.method();
3092 if (!m->is_native()) {
3093 InstanceKlass* holder = m->method_holder();
3094 assert(holder->is_klass(), "just checking");
3095 oop loader = holder->class_loader();
3096 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3097 return JNIHandles::make_local(env, loader);
3098 }
3099 }
3100 }
3101 return NULL;
3102 JVM_END
3103
3104
3105 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3106 JVMWrapper("JVM_GetClassContext");
3107 ResourceMark rm(THREAD);
3108 JvmtiVMObjectAllocEventCollector oam;
3109 vframeStream vfst(thread);
3110
3111 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3112 // This must only be called from SecurityManager.getClassContext
3113 Method* m = vfst.method();
3114 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3115 m->name() == vmSymbols::getClassContext_name() &&
3116 m->signature() == vmSymbols::void_class_array_signature())) {
3117 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3118 }
3119 }
3120
3121 // Collect method holders
3122 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3123 for (; !vfst.at_end(); vfst.security_next()) {
3124 Method* m = vfst.method();
3125 // Native frames are not returned
3126 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3127 Klass* holder = m->method_holder();
3128 assert(holder->is_klass(), "just checking");
3129 klass_array->append(holder);
3130 }
3131 }
3132
3133 // Create result array of type [Ljava/lang/Class;
3134 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3135 // Fill in mirrors corresponding to method holders
3136 for (int i = 0; i < klass_array->length(); i++) {
3137 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3138 }
3139
3140 return (jobjectArray) JNIHandles::make_local(env, result);
3141 JVM_END
3142
3143
3144 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3145 JVMWrapper("JVM_ClassDepth");
3146 ResourceMark rm(THREAD);
3147 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3148 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3149
3150 const char* str = java_lang_String::as_utf8_string(class_name_str());
3151 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3152 if (class_name_sym == NULL) {
3153 return -1;
3154 }
3155
3156 int depth = 0;
3157
3158 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3159 if (!vfst.method()->is_native()) {
3160 InstanceKlass* holder = vfst.method()->method_holder();
3161 assert(holder->is_klass(), "just checking");
3162 if (holder->name() == class_name_sym) {
3163 return depth;
3164 }
3165 depth++;
3166 }
3167 }
3168 return -1;
3169 JVM_END
3170
3171
3172 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3173 JVMWrapper("JVM_ClassLoaderDepth");
3174 ResourceMark rm(THREAD);
3175 int depth = 0;
3176 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3177 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3178 bool trusted = is_trusted_frame(thread, &vfst);
3179 if (trusted) return -1;
3180
3181 Method* m = vfst.method();
3182 if (!m->is_native()) {
3183 InstanceKlass* holder = m->method_holder();
3184 assert(holder->is_klass(), "just checking");
3185 oop loader = holder->class_loader();
3186 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3187 return depth;
3188 }
3189 depth++;
3190 }
3191 }
3192 return -1;
3193 JVM_END
3194
3195
3196 // java.lang.Package ////////////////////////////////////////////////////////////////
3197
3198
3199 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3200 JVMWrapper("JVM_GetSystemPackage");
3201 ResourceMark rm(THREAD);
3202 JvmtiVMObjectAllocEventCollector oam;
3203 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3204 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3205 return (jstring) JNIHandles::make_local(result);
3206 JVM_END
3207
3208
3209 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3210 JVMWrapper("JVM_GetSystemPackages");
3211 JvmtiVMObjectAllocEventCollector oam;
3212 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3213 return (jobjectArray) JNIHandles::make_local(result);
3214 JVM_END
3215
3216
3217 // ObjectInputStream ///////////////////////////////////////////////////////////////
3218
3219 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3220 if (current_class == NULL) {
3221 return true;
3222 }
3223 if ((current_class == field_class) || access.is_public()) {
3224 return true;
3225 }
3226
3227 if (access.is_protected()) {
3228 // See if current_class is a subclass of field_class
3229 if (current_class->is_subclass_of(field_class)) {
3230 return true;
3231 }
3232 }
3233
3234 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3235 }
3236
3237 // Return the first non-null class loader up the execution stack, or null
3238 // if only code from the null class loader is on the stack.
3239
3240 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3241 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3242 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3243 oop loader = vfst.method()->method_holder()->class_loader();
3244 if (loader != NULL) {
3245 return JNIHandles::make_local(env, loader);
3246 }
3247 }
3248 return NULL;
3249 JVM_END
3250
3251
3252 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3253
3254
3255 // resolve array handle and check arguments
3256 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3257 if (arr == NULL) {
3258 THROW_0(vmSymbols::java_lang_NullPointerException());
3259 }
3260 oop a = JNIHandles::resolve_non_null(arr);
3261 if (!a->is_array()) {
3262 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3263 } else if (type_array_only && !a->is_typeArray()) {
3264 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3265 }
3266 return arrayOop(a);
3267 }
3268
3269
3270 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3271 JVMWrapper("JVM_GetArrayLength");
3272 arrayOop a = check_array(env, arr, false, CHECK_0);
3273 return a->length();
3274 JVM_END
3275
3276
3277 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3278 JVMWrapper("JVM_Array_Get");
3279 JvmtiVMObjectAllocEventCollector oam;
3280 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3281 jvalue value;
3282 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3283 oop box = Reflection::box(&value, type, CHECK_NULL);
3284 return JNIHandles::make_local(env, box);
3285 JVM_END
3286
3287
3288 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3289 JVMWrapper("JVM_GetPrimitiveArrayElement");
3290 jvalue value;
3291 value.i = 0; // to initialize value before getting used in CHECK
3292 arrayOop a = check_array(env, arr, true, CHECK_(value));
3293 assert(a->is_typeArray(), "just checking");
3294 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3295 BasicType wide_type = (BasicType) wCode;
3296 if (type != wide_type) {
3297 Reflection::widen(&value, type, wide_type, CHECK_(value));
3298 }
3299 return value;
3300 JVM_END
3301
3302
3303 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3304 JVMWrapper("JVM_SetArrayElement");
3305 arrayOop a = check_array(env, arr, false, CHECK);
3306 oop box = JNIHandles::resolve(val);
3307 jvalue value;
3308 value.i = 0; // to initialize value before getting used in CHECK
3309 BasicType value_type;
3310 if (a->is_objArray()) {
3311 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3312 value_type = Reflection::unbox_for_regular_object(box, &value);
3313 } else {
3314 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3315 }
3316 Reflection::array_set(&value, a, index, value_type, CHECK);
3317 JVM_END
3318
3319
3320 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3321 JVMWrapper("JVM_SetPrimitiveArrayElement");
3322 arrayOop a = check_array(env, arr, true, CHECK);
3323 assert(a->is_typeArray(), "just checking");
3324 BasicType value_type = (BasicType) vCode;
3325 Reflection::array_set(&v, a, index, value_type, CHECK);
3326 JVM_END
3327
3328
3329 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3330 JVMWrapper("JVM_NewArray");
3331 JvmtiVMObjectAllocEventCollector oam;
3332 oop element_mirror = JNIHandles::resolve(eltClass);
3333 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3334 return JNIHandles::make_local(env, result);
3335 JVM_END
3336
3337
3338 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3339 JVMWrapper("JVM_NewMultiArray");
3340 JvmtiVMObjectAllocEventCollector oam;
3341 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3342 oop element_mirror = JNIHandles::resolve(eltClass);
3343 assert(dim_array->is_typeArray(), "just checking");
3344 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3345 return JNIHandles::make_local(env, result);
3346 JVM_END
3347
3348
3349 // Library support ///////////////////////////////////////////////////////////////////////////
3350
3351 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3352 //%note jvm_ct
3353 JVMWrapper2("JVM_LoadLibrary (%s)", name);
3354 char ebuf[1024];
3355 void *load_result;
3356 {
3357 ThreadToNativeFromVM ttnfvm(thread);
3358 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3359 }
3360 if (load_result == NULL) {
3361 char msg[1024];
3362 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3363 // Since 'ebuf' may contain a string encoded using
3364 // platform encoding scheme, we need to pass
3365 // Exceptions::unsafe_to_utf8 to the new_exception method
3366 // as the last argument. See bug 6367357.
3367 Handle h_exception =
3368 Exceptions::new_exception(thread,
3369 vmSymbols::java_lang_UnsatisfiedLinkError(),
3370 msg, Exceptions::unsafe_to_utf8);
3371
3372 THROW_HANDLE_0(h_exception);
3373 }
3374 return load_result;
3375 JVM_END
3376
3377
3378 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3379 JVMWrapper("JVM_UnloadLibrary");
3380 os::dll_unload(handle);
3381 JVM_END
3382
3383
3384 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3385 JVMWrapper2("JVM_FindLibraryEntry (%s)", name);
3386 return os::dll_lookup(handle, name);
3387 JVM_END
3388
3389
3390 // JNI version ///////////////////////////////////////////////////////////////////////////////
3391
3392 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3393 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version);
3394 return Threads::is_supported_jni_version_including_1_1(version);
3395 JVM_END
3396
3397
3398 // String support ///////////////////////////////////////////////////////////////////////////
3399
3400 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3401 JVMWrapper("JVM_InternString");
3402 JvmtiVMObjectAllocEventCollector oam;
3403 if (str == NULL) return NULL;
3404 oop string = JNIHandles::resolve_non_null(str);
3405 oop result = StringTable::intern(string, CHECK_NULL);
3406 return (jstring) JNIHandles::make_local(env, result);
3407 JVM_END
3408
3409
3410 // Raw monitor support //////////////////////////////////////////////////////////////////////
3411
3412 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
3413 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
3414 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
3415 // that only works with java threads.
3416
3417
3418 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3419 VM_Exit::block_if_vm_exited();
3420 JVMWrapper("JVM_RawMonitorCreate");
3421 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
3422 }
3423
3424
3425 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3426 VM_Exit::block_if_vm_exited();
3427 JVMWrapper("JVM_RawMonitorDestroy");
3428 delete ((Mutex*) mon);
3429 }
3430
3431
3432 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3433 VM_Exit::block_if_vm_exited();
3434 JVMWrapper("JVM_RawMonitorEnter");
3435 ((Mutex*) mon)->jvm_raw_lock();
3436 return 0;
3437 }
3438
3439
3440 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3441 VM_Exit::block_if_vm_exited();
3442 JVMWrapper("JVM_RawMonitorExit");
3443 ((Mutex*) mon)->jvm_raw_unlock();
3444 }
3445
3446
3447 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3448
3449 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3450 Handle loader, Handle protection_domain,
3451 jboolean throwError, TRAPS) {
3452 // Security Note:
3453 // The Java level wrapper will perform the necessary security check allowing
3454 // us to pass the NULL as the initiating class loader. The VM is responsible for
3455 // the checkPackageAccess relative to the initiating class loader via the
3456 // protection_domain. The protection_domain is passed as NULL by the java code
3457 // if there is no security manager in 3-arg Class.forName().
3458 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3459
3460 KlassHandle klass_handle(THREAD, klass);
3461 // Check if we should initialize the class
3462 if (init && klass_handle->is_instance_klass()) {
3463 klass_handle->initialize(CHECK_NULL);
3464 }
3465 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
3466 }
3467
3468
3469 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3470
3471 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3472 JVMWrapper("JVM_InvokeMethod");
3473 Handle method_handle;
3474 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3475 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3476 Handle receiver(THREAD, JNIHandles::resolve(obj));
3477 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3478 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3479 jobject res = JNIHandles::make_local(env, result);
3480 if (JvmtiExport::should_post_vm_object_alloc()) {
3481 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3482 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3483 if (java_lang_Class::is_primitive(ret_type)) {
3484 // Only for primitive type vm allocates memory for java object.
3485 // See box() method.
3486 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3487 }
3488 }
3489 return res;
3490 } else {
3491 THROW_0(vmSymbols::java_lang_StackOverflowError());
3492 }
3493 JVM_END
3494
3495
3496 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3497 JVMWrapper("JVM_NewInstanceFromConstructor");
3498 oop constructor_mirror = JNIHandles::resolve(c);
3499 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3500 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3501 jobject res = JNIHandles::make_local(env, result);
3502 if (JvmtiExport::should_post_vm_object_alloc()) {
3503 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3504 }
3505 return res;
3506 JVM_END
3507
3508 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3509
3510 JVM_LEAF(jboolean, JVM_SupportsCX8())
3511 JVMWrapper("JVM_SupportsCX8");
3512 return VM_Version::supports_cx8();
3513 JVM_END
3514
3515 // Returns an array of all live Thread objects (VM internal JavaThreads,
3516 // jvmti agent threads, and JNI attaching threads are skipped)
3517 // See CR 6404306 regarding JNI attaching threads
3518 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3519 ResourceMark rm(THREAD);
3520 ThreadsListEnumerator tle(THREAD, false, false);
3521 JvmtiVMObjectAllocEventCollector oam;
3522
3523 int num_threads = tle.num_threads();
3524 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3525 objArrayHandle threads_ah(THREAD, r);
3526
3527 for (int i = 0; i < num_threads; i++) {
3528 Handle h = tle.get_threadObj(i);
3529 threads_ah->obj_at_put(i, h());
3530 }
3531
3532 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3533 JVM_END
3534
3535
3536 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3537 // Return StackTraceElement[][], each element is the stack trace of a thread in
3538 // the corresponding entry in the given threads array
3539 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3540 JVMWrapper("JVM_DumpThreads");
3541 JvmtiVMObjectAllocEventCollector oam;
3542
3543 // Check if threads is null
3544 if (threads == NULL) {
3545 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3546 }
3547
3548 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3549 objArrayHandle ah(THREAD, a);
3550 int num_threads = ah->length();
3551 // check if threads is non-empty array
3552 if (num_threads == 0) {
3553 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3554 }
3555
3556 // check if threads is not an array of objects of Thread class
3557 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3558 if (k != SystemDictionary::Thread_klass()) {
3559 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3560 }
3561
3562 ResourceMark rm(THREAD);
3563
3564 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3565 for (int i = 0; i < num_threads; i++) {
3566 oop thread_obj = ah->obj_at(i);
3567 instanceHandle h(THREAD, (instanceOop) thread_obj);
3568 thread_handle_array->append(h);
3569 }
3570
3571 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3572 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3573
3574 JVM_END
3575
3576 // JVM monitoring and management support
3577 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3578 return Management::get_jmm_interface(version);
3579 JVM_END
3580
3581 // com.sun.tools.attach.VirtualMachine agent properties support
3582 //
3583 // Initialize the agent properties with the properties maintained in the VM
3584 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3585 JVMWrapper("JVM_InitAgentProperties");
3586 ResourceMark rm;
3587
3588 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3589
3590 PUTPROP(props, "sun.java.command", Arguments::java_command());
3591 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3592 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3593 return properties;
3594 JVM_END
3595
3596 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3597 {
3598 JVMWrapper("JVM_GetEnclosingMethodInfo");
3599 JvmtiVMObjectAllocEventCollector oam;
3600
3601 if (ofClass == NULL) {
3602 return NULL;
3603 }
3604 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3605 // Special handling for primitive objects
3606 if (java_lang_Class::is_primitive(mirror())) {
3607 return NULL;
3608 }
3609 Klass* k = java_lang_Class::as_Klass(mirror());
3610 if (!k->is_instance_klass()) {
3611 return NULL;
3612 }
3613 instanceKlassHandle ik_h(THREAD, k);
3614 int encl_method_class_idx = ik_h->enclosing_method_class_index();
3615 if (encl_method_class_idx == 0) {
3616 return NULL;
3617 }
3618 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3619 objArrayHandle dest(THREAD, dest_o);
3620 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3621 dest->obj_at_put(0, enc_k->java_mirror());
3622 int encl_method_method_idx = ik_h->enclosing_method_method_index();
3623 if (encl_method_method_idx != 0) {
3624 Symbol* sym = ik_h->constants()->symbol_at(
3625 extract_low_short_from_int(
3626 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3627 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3628 dest->obj_at_put(1, str());
3629 sym = ik_h->constants()->symbol_at(
3630 extract_high_short_from_int(
3631 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
3632 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3633 dest->obj_at_put(2, str());
3634 }
3635 return (jobjectArray) JNIHandles::make_local(dest());
3636 }
3637 JVM_END
3638
3639 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3640 {
3641 memset(info, 0, info_size);
3642
3643 info->jvm_version = Abstract_VM_Version::jvm_version();
3644 info->update_version = 0; /* 0 in HotSpot Express VM */
3645 info->special_update_version = 0; /* 0 in HotSpot Express VM */
3646
3647 // when we add a new capability in the jvm_version_info struct, we should also
3648 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3649 // counter defined in runtimeService.cpp.
3650 info->is_attachable = AttachListener::is_attach_supported();
3651 }
3652 JVM_END