1 /*
2 * Copyright (c) 1997, 2020, 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/classLoaderData.inline.hpp"
28 #include "classfile/classLoaderExt.hpp"
29 #include "classfile/javaAssertions.hpp"
30 #include "classfile/javaClasses.hpp"
31 #include "classfile/symbolTable.hpp"
32 #include "classfile/systemDictionary.hpp"
33 #if INCLUDE_CDS
34 #include "classfile/sharedClassUtil.hpp"
35 #include "classfile/systemDictionaryShared.hpp"
36 #endif
37 #include "classfile/vmSymbols.hpp"
38 #include "gc_interface/collectedHeap.inline.hpp"
39 #include "interpreter/bytecode.hpp"
40 #include "jfr/jfrEvents.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/referenceType.hpp"
43 #include "memory/universe.inline.hpp"
44 #include "oops/fieldStreams.hpp"
45 #include "oops/instanceKlass.hpp"
46 #include "oops/objArrayKlass.hpp"
47 #include "oops/method.hpp"
48 #include "prims/jvm.h"
49 #include "prims/jvm_misc.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "prims/jvmtiThreadState.hpp"
52 #include "prims/nativeLookup.hpp"
53 #include "prims/privilegedStack.hpp"
54 #include "runtime/arguments.hpp"
55 #include "runtime/dtraceJSDT.hpp"
56 #include "runtime/handles.inline.hpp"
57 #include "runtime/init.hpp"
58 #include "runtime/interfaceSupport.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/javaCalls.hpp"
61 #include "runtime/jfieldIDWorkaround.hpp"
62 #include "runtime/orderAccess.inline.hpp"
63 #include "runtime/os.hpp"
64 #include "runtime/perfData.hpp"
65 #include "runtime/reflection.hpp"
66 #include "runtime/vframe.hpp"
67 #include "runtime/vm_operations.hpp"
68 #include "services/attachListener.hpp"
69 #include "services/management.hpp"
70 #include "services/threadService.hpp"
71 #include "utilities/copy.hpp"
72 #include "utilities/defaultStream.hpp"
73 #include "utilities/dtrace.hpp"
74 #include "utilities/events.hpp"
75 #include "utilities/histogram.hpp"
76 #include "utilities/top.hpp"
77 #include "utilities/utf8.hpp"
78 #ifdef TARGET_OS_FAMILY_linux
79 # include "jvm_linux.h"
80 #endif
81 #ifdef TARGET_OS_FAMILY_solaris
82 # include "jvm_solaris.h"
83 #endif
84 #ifdef TARGET_OS_FAMILY_windows
85 # include "jvm_windows.h"
86 #endif
87 #ifdef TARGET_OS_FAMILY_aix
88 # include "jvm_aix.h"
89 #endif
90 #ifdef TARGET_OS_FAMILY_bsd
91 # include "jvm_bsd.h"
92 #endif
93
94 #if INCLUDE_ALL_GCS
95 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
96 #endif // INCLUDE_ALL_GCS
97
98 #include <errno.h>
99 #include <jfr/recorder/jfrRecorder.hpp>
100
101 #ifndef USDT2
102 HS_DTRACE_PROBE_DECL1(hotspot, thread__sleep__begin, long long);
103 HS_DTRACE_PROBE_DECL1(hotspot, thread__sleep__end, int);
104 HS_DTRACE_PROBE_DECL0(hotspot, thread__yield);
105 #endif /* !USDT2 */
106
107 /*
108 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
109 such ctors and calls MUST NOT come between an oop declaration/init and its
110 usage because if objects are move this may cause various memory stomps, bus
111 errors and segfaults. Here is a cookbook for causing so called "naked oop
112 failures":
113
114 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
115 JVMWrapper("JVM_GetClassDeclaredFields");
116
117 // Object address to be held directly in mirror & not visible to GC
118 oop mirror = JNIHandles::resolve_non_null(ofClass);
119
120 // If this ctor can hit a safepoint, moving objects around, then
121 ComplexConstructor foo;
122
123 // Boom! mirror may point to JUNK instead of the intended object
124 (some dereference of mirror)
125
126 // Here's another call that may block for GC, making mirror stale
127 MutexLocker ml(some_lock);
128
129 // And here's an initializer that can result in a stale oop
130 // all in one step.
131 oop o = call_that_can_throw_exception(TRAPS);
132
133
134 The solution is to keep the oop declaration BELOW the ctor or function
135 call that might cause a GC, do another resolve to reassign the oop, or
136 consider use of a Handle instead of an oop so there is immunity from object
137 motion. But note that the "QUICK" entries below do not have a handlemark
138 and thus can only support use of handles passed in.
139 */
140
141 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
142 ResourceMark rm;
143 int line_number = -1;
144 const char * source_file = NULL;
145 const char * trace = "explicit";
146 InstanceKlass* caller = NULL;
147 JavaThread* jthread = JavaThread::current();
148 if (jthread->has_last_Java_frame()) {
149 vframeStream vfst(jthread);
150
151 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
152 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
153 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
154 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
155 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
156
157 Method* last_caller = NULL;
158
159 while (!vfst.at_end()) {
160 Method* m = vfst.method();
161 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
162 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
163 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
164 break;
165 }
166 last_caller = m;
167 vfst.next();
168 }
169 // if this is called from Class.forName0 and that is called from Class.forName,
170 // then print the caller of Class.forName. If this is Class.loadClass, then print
171 // that caller, otherwise keep quiet since this should be picked up elsewhere.
172 bool found_it = false;
173 if (!vfst.at_end() &&
174 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
175 vfst.method()->name() == vmSymbols::forName0_name()) {
176 vfst.next();
177 if (!vfst.at_end() &&
178 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
179 vfst.method()->name() == vmSymbols::forName_name()) {
180 vfst.next();
181 found_it = true;
182 }
183 } else if (last_caller != NULL &&
184 last_caller->method_holder()->name() ==
185 vmSymbols::java_lang_ClassLoader() &&
186 (last_caller->name() == vmSymbols::loadClassInternal_name() ||
187 last_caller->name() == vmSymbols::loadClass_name())) {
188 found_it = true;
189 } else if (!vfst.at_end()) {
190 if (vfst.method()->is_native()) {
191 // JNI call
192 found_it = true;
193 }
194 }
195 if (found_it && !vfst.at_end()) {
196 // found the caller
197 caller = vfst.method()->method_holder();
198 line_number = vfst.method()->line_number_from_bci(vfst.bci());
199 if (line_number == -1) {
200 // show method name if it's a native method
201 trace = vfst.method()->name_and_sig_as_C_string();
202 }
203 Symbol* s = caller->source_file_name();
204 if (s != NULL) {
205 source_file = s->as_C_string();
206 }
207 }
208 }
209 if (caller != NULL) {
210 if (to_class != caller) {
211 const char * from = caller->external_name();
212 const char * to = to_class->external_name();
213 // print in a single call to reduce interleaving between threads
214 if (source_file != NULL) {
215 tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace);
216 } else {
217 tty->print("RESOLVE %s %s (%s)\n", from, to, trace);
218 }
219 }
220 }
221 }
222
223 void trace_class_resolution(Klass* to_class) {
224 EXCEPTION_MARK;
225 trace_class_resolution_impl(to_class, THREAD);
226 if (HAS_PENDING_EXCEPTION) {
227 CLEAR_PENDING_EXCEPTION;
228 }
229 }
230
231 // Wrapper to trace JVM functions
232
233 #ifdef ASSERT
234 class JVMTraceWrapper : public StackObj {
235 public:
236 JVMTraceWrapper(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) {
237 if (TraceJVMCalls) {
238 va_list ap;
239 va_start(ap, format);
240 tty->print("JVM ");
241 tty->vprint_cr(format, ap);
242 va_end(ap);
243 }
244 }
245 };
246
247 Histogram* JVMHistogram;
248 volatile jint JVMHistogram_lock = 0;
249
250 class JVMHistogramElement : public HistogramElement {
251 public:
252 JVMHistogramElement(const char* name);
253 };
254
255 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
256 _name = elementName;
257 uintx count = 0;
258
259 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
260 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
261 count +=1;
262 if ( (WarnOnStalledSpinLock > 0)
263 && (count % WarnOnStalledSpinLock == 0)) {
264 warning("JVMHistogram_lock seems to be stalled");
265 }
266 }
267 }
268
269 if(JVMHistogram == NULL)
270 JVMHistogram = new Histogram("JVM Call Counts",100);
271
272 JVMHistogram->add_element(this);
273 Atomic::dec(&JVMHistogram_lock);
274 }
275
276 #define JVMCountWrapper(arg) \
277 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
278 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
279
280 #define JVMWrapper(arg1) JVMCountWrapper(arg1); JVMTraceWrapper(arg1)
281 #define JVMWrapper2(arg1, arg2) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2)
282 #define JVMWrapper3(arg1, arg2, arg3) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3)
283 #define JVMWrapper4(arg1, arg2, arg3, arg4) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3, arg4)
284 #else
285 #define JVMWrapper(arg1)
286 #define JVMWrapper2(arg1, arg2)
287 #define JVMWrapper3(arg1, arg2, arg3)
288 #define JVMWrapper4(arg1, arg2, arg3, arg4)
289 #endif
290
291
292 // Interface version /////////////////////////////////////////////////////////////////////
293
294
295 JVM_LEAF(jint, JVM_GetInterfaceVersion())
296 return JVM_INTERFACE_VERSION;
297 JVM_END
298
299
300 // java.lang.System //////////////////////////////////////////////////////////////////////
301
302
303 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
304 JVMWrapper("JVM_CurrentTimeMillis");
305 return os::javaTimeMillis();
306 JVM_END
307
308 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
309 JVMWrapper("JVM_NanoTime");
310 return os::javaTimeNanos();
311 JVM_END
312
313
314 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
315 jobject dst, jint dst_pos, jint length))
316 JVMWrapper("JVM_ArrayCopy");
317 // Check if we have null pointers
318 if (src == NULL || dst == NULL) {
319 THROW(vmSymbols::java_lang_NullPointerException());
320 }
321 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
322 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
323 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop");
324 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop");
325 // Do copy
326 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
327 JVM_END
328
329
330 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
331 JavaValue r(T_OBJECT);
332 // public synchronized Object put(Object key, Object value);
333 HandleMark hm(THREAD);
334 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
335 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
336 JavaCalls::call_virtual(&r,
337 props,
338 KlassHandle(THREAD, SystemDictionary::Properties_klass()),
339 vmSymbols::put_name(),
340 vmSymbols::object_object_object_signature(),
341 key_str,
342 value_str,
343 THREAD);
344 }
345
346
347 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
348
349
350 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
351 JVMWrapper("JVM_InitProperties");
352 ResourceMark rm;
353
354 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
355
356 // System property list includes both user set via -D option and
357 // jvm system specific properties.
358 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
359 PUTPROP(props, p->key(), p->value());
360 }
361
362 // Convert the -XX:MaxDirectMemorySize= command line flag
363 // to the sun.nio.MaxDirectMemorySize property.
364 // Do this after setting user properties to prevent people
365 // from setting the value with a -D option, as requested.
366 {
367 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
368 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
369 } else {
370 char as_chars[256];
371 jio_snprintf(as_chars, sizeof(as_chars), UINTX_FORMAT, MaxDirectMemorySize);
372 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
373 }
374 }
375
376 // JVM monitoring and management support
377 // Add the sun.management.compiler property for the compiler's name
378 {
379 #undef CSIZE
380 #if defined(_LP64) || defined(_WIN64)
381 #define CSIZE "64-Bit "
382 #else
383 #define CSIZE
384 #endif // 64bit
385
386 #ifdef TIERED
387 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
388 #else
389 #if defined(COMPILER1)
390 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
391 #elif defined(COMPILER2)
392 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
393 #else
394 const char* compiler_name = "";
395 #endif // compilers
396 #endif // TIERED
397
398 if (*compiler_name != '\0' &&
399 (Arguments::mode() != Arguments::_int)) {
400 PUTPROP(props, "sun.management.compiler", compiler_name);
401 }
402 }
403
404 const char* enableSharedLookupCache = "false";
405 #if INCLUDE_CDS
406 if (ClassLoaderExt::is_lookup_cache_enabled()) {
407 enableSharedLookupCache = "true";
408 }
409 #endif
410 PUTPROP(props, "sun.cds.enableSharedLookupCache", enableSharedLookupCache);
411
412 return properties;
413 JVM_END
414
415
416 /*
417 * Return the temporary directory that the VM uses for the attach
418 * and perf data files.
419 *
420 * It is important that this directory is well-known and the
421 * same for all VM instances. It cannot be affected by configuration
422 * variables such as java.io.tmpdir.
423 */
424 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
425 JVMWrapper("JVM_GetTemporaryDirectory");
426 HandleMark hm(THREAD);
427 const char* temp_dir = os::get_temp_directory();
428 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
429 return (jstring) JNIHandles::make_local(env, h());
430 JVM_END
431
432
433 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
434
435 extern volatile jint vm_created;
436
437 JVM_ENTRY_NO_ENV(void, JVM_Exit(jint code))
438 if (vm_created != 0 && (code == 0)) {
439 // The VM is about to exit. We call back into Java to check whether finalizers should be run
440 Universe::run_finalizers_on_exit();
441 }
442 before_exit(thread);
443 vm_exit(code);
444 JVM_END
445
446
447 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
448 JVMWrapper("JVM_BeforeHalt");
449 EventShutdown event;
450 if (event.should_commit()) {
451 event.set_reason("Shutdown requested from Java");
452 event.commit();
453 }
454 JVM_END
455
456
457 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
458 before_exit(thread);
459 vm_exit(code);
460 JVM_END
461
462
463 JVM_LEAF(void, JVM_OnExit(void (*func)(void)))
464 register_on_exit_function(func);
465 JVM_END
466
467
468 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
469 JVMWrapper("JVM_GC");
470 if (!DisableExplicitGC) {
471 Universe::heap()->collect(GCCause::_java_lang_system_gc);
472 }
473 JVM_END
474
475
476 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
477 JVMWrapper("JVM_MaxObjectInspectionAge");
478 return Universe::heap()->millis_since_last_gc();
479 JVM_END
480
481
482 JVM_LEAF(void, JVM_TraceInstructions(jboolean on))
483 if (PrintJVMWarnings) warning("JVM_TraceInstructions not supported");
484 JVM_END
485
486
487 JVM_LEAF(void, JVM_TraceMethodCalls(jboolean on))
488 if (PrintJVMWarnings) warning("JVM_TraceMethodCalls not supported");
489 JVM_END
490
491 static inline jlong convert_size_t_to_jlong(size_t val) {
492 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
493 NOT_LP64 (return (jlong)val;)
494 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
495 }
496
497 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
498 JVMWrapper("JVM_TotalMemory");
499 size_t n = Universe::heap()->capacity();
500 return convert_size_t_to_jlong(n);
501 JVM_END
502
503
504 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
505 JVMWrapper("JVM_FreeMemory");
506 CollectedHeap* ch = Universe::heap();
507 size_t n;
508 {
509 MutexLocker x(Heap_lock);
510 n = ch->capacity() - ch->used();
511 }
512 return convert_size_t_to_jlong(n);
513 JVM_END
514
515
516 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
517 JVMWrapper("JVM_MaxMemory");
518 size_t n = Universe::heap()->max_capacity();
519 return convert_size_t_to_jlong(n);
520 JVM_END
521
522
523 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
524 JVMWrapper("JVM_ActiveProcessorCount");
525 return os::active_processor_count();
526 JVM_END
527
528
529 JVM_ENTRY_NO_ENV(jboolean, JVM_IsUseContainerSupport(void))
530 JVMWrapper("JVM_IsUseContainerSupport");
531 #ifdef TARGET_OS_FAMILY_linux
532 if (UseContainerSupport) {
533 return JNI_TRUE;
534 }
535 #endif
536 return JNI_FALSE;
537 JVM_END
538
539
540
541 // java.lang.Throwable //////////////////////////////////////////////////////
542
543
544 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
545 JVMWrapper("JVM_FillInStackTrace");
546 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
547 java_lang_Throwable::fill_in_stack_trace(exception);
548 JVM_END
549
550
551 JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable))
552 JVMWrapper("JVM_GetStackTraceDepth");
553 oop exception = JNIHandles::resolve(throwable);
554 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD);
555 JVM_END
556
557
558 JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index))
559 JVMWrapper("JVM_GetStackTraceElement");
560 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC
561 oop exception = JNIHandles::resolve(throwable);
562 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL);
563 return JNIHandles::make_local(env, element);
564 JVM_END
565
566
567 // java.lang.Object ///////////////////////////////////////////////
568
569
570 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
571 JVMWrapper("JVM_IHashCode");
572 // as implemented in the classic virtual machine; return 0 if object is NULL
573 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
574 JVM_END
575
576
577 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
578 JVMWrapper("JVM_MonitorWait");
579 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
580 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
581 if (JvmtiExport::should_post_monitor_wait()) {
582 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
583
584 // The current thread already owns the monitor and it has not yet
585 // been added to the wait queue so the current thread cannot be
586 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
587 // event handler cannot accidentally consume an unpark() meant for
588 // the ParkEvent associated with this ObjectMonitor.
589 }
590 ObjectSynchronizer::wait(obj, ms, CHECK);
591 JVM_END
592
593
594 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
595 JVMWrapper("JVM_MonitorNotify");
596 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
597 ObjectSynchronizer::notify(obj, CHECK);
598 JVM_END
599
600
601 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
602 JVMWrapper("JVM_MonitorNotifyAll");
603 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
604 ObjectSynchronizer::notifyall(obj, CHECK);
605 JVM_END
606
607
608 static void fixup_cloned_reference(ReferenceType ref_type, oop src, oop clone) {
609 // If G1 is enabled then we need to register a non-null referent
610 // with the SATB barrier.
611 #if INCLUDE_ALL_GCS
612 if (UseG1GC) {
613 oop referent = java_lang_ref_Reference::referent(clone);
614 if (referent != NULL) {
615 G1SATBCardTableModRefBS::enqueue(referent);
616 }
617 }
618 #endif // INCLUDE_ALL_GCS
619 if ((java_lang_ref_Reference::next(clone) != NULL) ||
620 (java_lang_ref_Reference::queue(clone) == java_lang_ref_ReferenceQueue::ENQUEUED_queue())) {
621 // If the source has been enqueued or is being enqueued, don't
622 // register the clone with a queue.
623 java_lang_ref_Reference::set_queue(clone, java_lang_ref_ReferenceQueue::NULL_queue());
624 }
625 // discovered and next are list links; the clone is not in those lists.
626 java_lang_ref_Reference::set_discovered(clone, NULL);
627 java_lang_ref_Reference::set_next(clone, NULL);
628 }
629
630 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
631 JVMWrapper("JVM_Clone");
632 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
633 const KlassHandle klass (THREAD, obj->klass());
634 JvmtiVMObjectAllocEventCollector oam;
635
636 #ifdef ASSERT
637 // Just checking that the cloneable flag is set correct
638 if (obj->is_array()) {
639 guarantee(klass->is_cloneable(), "all arrays are cloneable");
640 } else {
641 guarantee(obj->is_instance(), "should be instanceOop");
642 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
643 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
644 }
645 #endif
646
647 // Check if class of obj supports the Cloneable interface.
648 // All arrays are considered to be cloneable (See JLS 20.1.5)
649 if (!klass->is_cloneable()) {
650 ResourceMark rm(THREAD);
651 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
652 }
653
654 // Make shallow object copy
655 ReferenceType ref_type = REF_NONE;
656 const int size = obj->size();
657 oop new_obj_oop = NULL;
658 if (obj->is_array()) {
659 const int length = ((arrayOop)obj())->length();
660 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
661 } else {
662 ref_type = InstanceKlass::cast(klass())->reference_type();
663 assert((ref_type == REF_NONE) ==
664 !klass->is_subclass_of(SystemDictionary::Reference_klass()),
665 "invariant");
666 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
667 }
668
669 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
670 // is modifying a reference field in the clonee, a non-oop-atomic copy might
671 // be suspended in the middle of copying the pointer and end up with parts
672 // of two different pointers in the field. Subsequent dereferences will crash.
673 // 4846409: an oop-copy of objects with long or double fields or arrays of same
674 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
675 // of oops. We know objects are aligned on a minimum of an jlong boundary.
676 // The same is true of StubRoutines::object_copy and the various oop_copy
677 // variants, and of the code generated by the inline_native_clone intrinsic.
678 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
679 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop,
680 (size_t)align_object_size(size) / HeapWordsPerLong);
681 // Clear the header
682 new_obj_oop->init_mark();
683
684 // Store check (mark entire object and let gc sort it out)
685 BarrierSet* bs = Universe::heap()->barrier_set();
686 assert(bs->has_write_region_opt(), "Barrier set does not have write_region");
687 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size));
688
689 // If cloning a Reference, set Reference fields to a safe state.
690 // Fixup must be completed before any safepoint.
691 if (ref_type != REF_NONE) {
692 fixup_cloned_reference(ref_type, obj(), new_obj_oop);
693 }
694
695 Handle new_obj(THREAD, new_obj_oop);
696 // Special handling for MemberNames. Since they contain Method* metadata, they
697 // must be registered so that RedefineClasses can fix metadata contained in them.
698 if (java_lang_invoke_MemberName::is_instance(new_obj()) &&
699 java_lang_invoke_MemberName::is_method(new_obj())) {
700 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj());
701 // MemberName may be unresolved, so doesn't need registration until resolved.
702 if (method != NULL) {
703 methodHandle m(THREAD, method);
704 // This can safepoint and redefine method, so need both new_obj and method
705 // in a handle, for two different reasons. new_obj can move, method can be
706 // deleted if nothing is using it on the stack.
707 m->method_holder()->add_member_name(new_obj(), false);
708 }
709 }
710
711 // Caution: this involves a java upcall, so the clone should be
712 // "gc-robust" by this stage.
713 if (klass->has_finalizer()) {
714 assert(obj->is_instance(), "should be instanceOop");
715 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
716 new_obj = Handle(THREAD, new_obj_oop);
717 }
718
719 return JNIHandles::make_local(env, new_obj());
720 JVM_END
721
722 // java.lang.Compiler ////////////////////////////////////////////////////
723
724 // The initial cuts of the HotSpot VM will not support JITs, and all existing
725 // JITs would need extensive changes to work with HotSpot. The JIT-related JVM
726 // functions are all silently ignored unless JVM warnings are printed.
727
728 JVM_LEAF(void, JVM_InitializeCompiler (JNIEnv *env, jclass compCls))
729 if (PrintJVMWarnings) warning("JVM_InitializeCompiler not supported");
730 JVM_END
731
732
733 JVM_LEAF(jboolean, JVM_IsSilentCompiler(JNIEnv *env, jclass compCls))
734 if (PrintJVMWarnings) warning("JVM_IsSilentCompiler not supported");
735 return JNI_FALSE;
736 JVM_END
737
738
739 JVM_LEAF(jboolean, JVM_CompileClass(JNIEnv *env, jclass compCls, jclass cls))
740 if (PrintJVMWarnings) warning("JVM_CompileClass not supported");
741 return JNI_FALSE;
742 JVM_END
743
744
745 JVM_LEAF(jboolean, JVM_CompileClasses(JNIEnv *env, jclass cls, jstring jname))
746 if (PrintJVMWarnings) warning("JVM_CompileClasses not supported");
747 return JNI_FALSE;
748 JVM_END
749
750
751 JVM_LEAF(jobject, JVM_CompilerCommand(JNIEnv *env, jclass compCls, jobject arg))
752 if (PrintJVMWarnings) warning("JVM_CompilerCommand not supported");
753 return NULL;
754 JVM_END
755
756
757 JVM_LEAF(void, JVM_EnableCompiler(JNIEnv *env, jclass compCls))
758 if (PrintJVMWarnings) warning("JVM_EnableCompiler not supported");
759 JVM_END
760
761
762 JVM_LEAF(void, JVM_DisableCompiler(JNIEnv *env, jclass compCls))
763 if (PrintJVMWarnings) warning("JVM_DisableCompiler not supported");
764 JVM_END
765
766
767
768 // Error message support //////////////////////////////////////////////////////
769
770 JVM_LEAF(jint, JVM_GetLastErrorString(char *buf, int len))
771 JVMWrapper("JVM_GetLastErrorString");
772 return (jint)os::lasterror(buf, len);
773 JVM_END
774
775
776 // java.io.File ///////////////////////////////////////////////////////////////
777
778 JVM_LEAF(char*, JVM_NativePath(char* path))
779 JVMWrapper2("JVM_NativePath (%s)", path);
780 return os::native_path(path);
781 JVM_END
782
783
784 // java.nio.Bits ///////////////////////////////////////////////////////////////
785
786 #define MAX_OBJECT_SIZE \
787 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
788 + ((julong)max_jint * sizeof(double)) )
789
790 static inline jlong field_offset_to_byte_offset(jlong field_offset) {
791 return field_offset;
792 }
793
794 static inline void assert_field_offset_sane(oop p, jlong field_offset) {
795 #ifdef ASSERT
796 jlong byte_offset = field_offset_to_byte_offset(field_offset);
797
798 if (p != NULL) {
799 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
800 if (byte_offset == (jint)byte_offset) {
801 void* ptr_plus_disp = (address)p + byte_offset;
802 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
803 "raw [ptr+disp] must be consistent with oop::field_base");
804 }
805 jlong p_size = HeapWordSize * (jlong)(p->size());
806 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT
807 " > object's size " INT64_FORMAT,
808 (int64_t)byte_offset, (int64_t)p_size));
809 }
810 #endif
811 }
812
813 static inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
814 assert_field_offset_sane(p, field_offset);
815 jlong byte_offset = field_offset_to_byte_offset(field_offset);
816
817 if (sizeof(char*) == sizeof(jint)) { // (this constant folds!)
818 return (address)p + (jint) byte_offset;
819 } else {
820 return (address)p + byte_offset;
821 }
822 }
823
824 // This function is a leaf since if the source and destination are both in native memory
825 // the copy may potentially be very large, and we don't want to disable GC if we can avoid it.
826 // If either source or destination (or both) are on the heap, the function will enter VM using
827 // JVM_ENTRY_FROM_LEAF
828 JVM_LEAF(void, JVM_CopySwapMemory(JNIEnv *env, jobject srcObj, jlong srcOffset,
829 jobject dstObj, jlong dstOffset, jlong size,
830 jlong elemSize)) {
831
832 size_t sz = (size_t)size;
833 size_t esz = (size_t)elemSize;
834
835 if (srcObj == NULL && dstObj == NULL) {
836 // Both src & dst are in native memory
837 address src = (address)srcOffset;
838 address dst = (address)dstOffset;
839
840 Copy::conjoint_swap(src, dst, sz, esz);
841 } else {
842 // At least one of src/dst are on heap, transition to VM to access raw pointers
843
844 JVM_ENTRY_FROM_LEAF(env, void, JVM_CopySwapMemory) {
845 oop srcp = JNIHandles::resolve(srcObj);
846 oop dstp = JNIHandles::resolve(dstObj);
847
848 address src = (address)index_oop_from_field_offset_long(srcp, srcOffset);
849 address dst = (address)index_oop_from_field_offset_long(dstp, dstOffset);
850
851 Copy::conjoint_swap(src, dst, sz, esz);
852 } JVM_END
853 }
854 } JVM_END
855
856
857 // Misc. class handling ///////////////////////////////////////////////////////////
858
859
860 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
861 JVMWrapper("JVM_GetCallerClass");
862
863 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
864 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
865 // temporarily for existing code to use until a replacement API is defined.
866 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
867 Klass* k = thread->security_get_caller_class(depth);
868 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
869 }
870
871 // Getting the class of the caller frame.
872 //
873 // The call stack at this point looks something like this:
874 //
875 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
876 // [1] [ @CallerSensitive API.method ]
877 // [.] [ (skipped intermediate frames) ]
878 // [n] [ caller ]
879 vframeStream vfst(thread);
880 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
881 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
882 Method* m = vfst.method();
883 assert(m != NULL, "sanity");
884 switch (n) {
885 case 0:
886 // This must only be called from Reflection.getCallerClass
887 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
888 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
889 }
890 // fall-through
891 case 1:
892 // Frame 0 and 1 must be caller sensitive.
893 if (!m->caller_sensitive()) {
894 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
895 }
896 break;
897 default:
898 if (!m->is_ignored_by_security_stack_walk()) {
899 // We have reached the desired frame; return the holder class.
900 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
901 }
902 break;
903 }
904 }
905 return NULL;
906 JVM_END
907
908
909 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
910 JVMWrapper("JVM_FindPrimitiveClass");
911 oop mirror = NULL;
912 BasicType t = name2type(utf);
913 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
914 mirror = Universe::java_mirror(t);
915 }
916 if (mirror == NULL) {
917 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
918 } else {
919 return (jclass) JNIHandles::make_local(env, mirror);
920 }
921 JVM_END
922
923
924 JVM_ENTRY(void, JVM_ResolveClass(JNIEnv* env, jclass cls))
925 JVMWrapper("JVM_ResolveClass");
926 if (PrintJVMWarnings) warning("JVM_ResolveClass not implemented");
927 JVM_END
928
929
930 JVM_ENTRY(jboolean, JVM_KnownToNotExist(JNIEnv *env, jobject loader, const char *classname))
931 JVMWrapper("JVM_KnownToNotExist");
932 #if INCLUDE_CDS
933 return ClassLoaderExt::known_to_not_exist(env, loader, classname, THREAD);
934 #else
935 return false;
936 #endif
937 JVM_END
938
939
940 JVM_ENTRY(jobjectArray, JVM_GetResourceLookupCacheURLs(JNIEnv *env, jobject loader))
941 JVMWrapper("JVM_GetResourceLookupCacheURLs");
942 #if INCLUDE_CDS
943 return ClassLoaderExt::get_lookup_cache_urls(env, loader, THREAD);
944 #else
945 return NULL;
946 #endif
947 JVM_END
948
949
950 JVM_ENTRY(jintArray, JVM_GetResourceLookupCache(JNIEnv *env, jobject loader, const char *resource_name))
951 JVMWrapper("JVM_GetResourceLookupCache");
952 #if INCLUDE_CDS
953 return ClassLoaderExt::get_lookup_cache(env, loader, resource_name, THREAD);
954 #else
955 return NULL;
956 #endif
957 JVM_END
958
959
960 // Returns a class loaded by the bootstrap class loader; or null
961 // if not found. ClassNotFoundException is not thrown.
962 //
963 // Rationale behind JVM_FindClassFromBootLoader
964 // a> JVM_FindClassFromClassLoader was never exported in the export tables.
965 // b> because of (a) java.dll has a direct dependecy on the unexported
966 // private symbol "_JVM_FindClassFromClassLoader@20".
967 // c> the launcher cannot use the private symbol as it dynamically opens
968 // the entry point, so if something changes, the launcher will fail
969 // unexpectedly at runtime, it is safest for the launcher to dlopen a
970 // stable exported interface.
971 // d> re-exporting JVM_FindClassFromClassLoader as public, will cause its
972 // signature to change from _JVM_FindClassFromClassLoader@20 to
973 // JVM_FindClassFromClassLoader and will not be backward compatible
974 // with older JDKs.
975 // Thus a public/stable exported entry point is the right solution,
976 // public here means public in linker semantics, and is exported only
977 // to the JDK, and is not intended to be a public API.
978
979 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
980 const char* name))
981 JVMWrapper2("JVM_FindClassFromBootLoader %s", name);
982
983 // Java libraries should ensure that name is never null...
984 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
985 // It's impossible to create this class; the name cannot fit
986 // into the constant pool.
987 return NULL;
988 }
989
990 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
991 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
992 if (k == NULL) {
993 return NULL;
994 }
995
996 if (TraceClassResolution) {
997 trace_class_resolution(k);
998 }
999 return (jclass) JNIHandles::make_local(env, k->java_mirror());
1000 JVM_END
1001
1002 // Not used; JVM_FindClassFromCaller replaces this.
1003 JVM_ENTRY(jclass, JVM_FindClassFromClassLoader(JNIEnv* env, const char* name,
1004 jboolean init, jobject loader,
1005 jboolean throwError))
1006 JVMWrapper3("JVM_FindClassFromClassLoader %s throw %s", name,
1007 throwError ? "error" : "exception");
1008 // Java libraries should ensure that name is never null...
1009 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
1010 // It's impossible to create this class; the name cannot fit
1011 // into the constant pool.
1012 if (throwError) {
1013 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
1014 } else {
1015 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
1016 }
1017 }
1018 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
1019 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1020 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1021 Handle(), throwError, THREAD);
1022
1023 if (TraceClassResolution && result != NULL) {
1024 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1025 }
1026 return result;
1027 JVM_END
1028
1029 // Find a class with this name in this loader, using the caller's protection domain.
1030 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
1031 jboolean init, jobject loader,
1032 jclass caller))
1033 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name);
1034 // Java libraries should ensure that name is never null...
1035 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
1036 // It's impossible to create this class; the name cannot fit
1037 // into the constant pool.
1038 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
1039 }
1040
1041 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
1042
1043 oop loader_oop = JNIHandles::resolve(loader);
1044 oop from_class = JNIHandles::resolve(caller);
1045 oop protection_domain = NULL;
1046 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
1047 // NPE. Put it in another way, the bootstrap class loader has all permission and
1048 // thus no checkPackageAccess equivalence in the VM class loader.
1049 // The caller is also passed as NULL by the java code if there is no security
1050 // manager to avoid the performance cost of getting the calling class.
1051 if (from_class != NULL && loader_oop != NULL) {
1052 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
1053 }
1054
1055 Handle h_loader(THREAD, loader_oop);
1056 Handle h_prot(THREAD, protection_domain);
1057 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1058 h_prot, false, THREAD);
1059
1060 if (TraceClassResolution && result != NULL) {
1061 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1062 }
1063 return result;
1064 JVM_END
1065
1066 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1067 jboolean init, jclass from))
1068 JVMWrapper2("JVM_FindClassFromClass %s", name);
1069 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
1070 // It's impossible to create this class; the name cannot fit
1071 // into the constant pool.
1072 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
1073 }
1074 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
1075 oop from_class_oop = JNIHandles::resolve(from);
1076 Klass* from_class = (from_class_oop == NULL)
1077 ? (Klass*)NULL
1078 : java_lang_Class::as_Klass(from_class_oop);
1079 oop class_loader = NULL;
1080 oop protection_domain = NULL;
1081 if (from_class != NULL) {
1082 class_loader = from_class->class_loader();
1083 protection_domain = from_class->protection_domain();
1084 }
1085 Handle h_loader(THREAD, class_loader);
1086 Handle h_prot (THREAD, protection_domain);
1087 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1088 h_prot, true, thread);
1089
1090 if (TraceClassResolution && result != NULL) {
1091 // this function is generally only used for class loading during verification.
1092 ResourceMark rm;
1093 oop from_mirror = JNIHandles::resolve_non_null(from);
1094 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
1095 const char * from_name = from_class->external_name();
1096
1097 oop mirror = JNIHandles::resolve_non_null(result);
1098 Klass* to_class = java_lang_Class::as_Klass(mirror);
1099 const char * to = to_class->external_name();
1100 tty->print("RESOLVE %s %s (verification)\n", from_name, to);
1101 }
1102
1103 return result;
1104 JVM_END
1105
1106 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
1107 if (loader.is_null()) {
1108 return;
1109 }
1110
1111 // check whether the current caller thread holds the lock or not.
1112 // If not, increment the corresponding counter
1113 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
1114 ObjectSynchronizer::owner_self) {
1115 counter->inc();
1116 }
1117 }
1118
1119 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1120 // and JVM_DefineClassWithSourceCond()
1121 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
1122 jobject loader, const jbyte *buf,
1123 jsize len, jobject pd, const char *source,
1124 jboolean verify, TRAPS) {
1125 if (source == NULL) source = "__JVM_DefineClass__";
1126
1127 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1128 JavaThread* jt = (JavaThread*) THREAD;
1129
1130 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1131 ClassLoader::perf_define_appclass_selftime(),
1132 ClassLoader::perf_define_appclasses(),
1133 jt->get_thread_stat()->perf_recursion_counts_addr(),
1134 jt->get_thread_stat()->perf_timers_addr(),
1135 PerfClassTraceTime::DEFINE_CLASS);
1136
1137 if (UsePerfData) {
1138 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1139 }
1140
1141 // Since exceptions can be thrown, class initialization can take place
1142 // if name is NULL no check for class name in .class stream has to be made.
1143 TempNewSymbol class_name = NULL;
1144 if (name != NULL) {
1145 const int str_len = (int)strlen(name);
1146 if (str_len > Symbol::max_length()) {
1147 // It's impossible to create this class; the name cannot fit
1148 // into the constant pool.
1149 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
1150 }
1151 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
1152 }
1153
1154 ResourceMark rm(THREAD);
1155 ClassFileStream st((u1*) buf, len, (char *)source);
1156 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1157 if (UsePerfData) {
1158 is_lock_held_by_thread(class_loader,
1159 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
1160 THREAD);
1161 }
1162 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1163 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader,
1164 protection_domain, &st,
1165 verify != 0,
1166 CHECK_NULL);
1167
1168 if (TraceClassResolution && k != NULL) {
1169 trace_class_resolution(k);
1170 }
1171
1172 return (jclass) JNIHandles::make_local(env, k->java_mirror());
1173 }
1174
1175
1176 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1177 JVMWrapper2("JVM_DefineClass %s", name);
1178
1179 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD);
1180 JVM_END
1181
1182
1183 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1184 JVMWrapper2("JVM_DefineClassWithSource %s", name);
1185
1186 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD);
1187 JVM_END
1188
1189 JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name,
1190 jobject loader, const jbyte *buf,
1191 jsize len, jobject pd,
1192 const char *source, jboolean verify))
1193 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name);
1194
1195 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD);
1196 JVM_END
1197
1198 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1199 JVMWrapper("JVM_FindLoadedClass");
1200 ResourceMark rm(THREAD);
1201
1202 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1203 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
1204
1205 const char* str = java_lang_String::as_utf8_string(string());
1206 // Sanity check, don't expect null
1207 if (str == NULL) return NULL;
1208
1209 const int str_len = (int)strlen(str);
1210 if (str_len > Symbol::max_length()) {
1211 // It's impossible to create this class; the name cannot fit
1212 // into the constant pool.
1213 return NULL;
1214 }
1215 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
1216
1217 // Security Note:
1218 // The Java level wrapper will perform the necessary security check allowing
1219 // us to pass the NULL as the initiating class loader.
1220 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1221 if (UsePerfData) {
1222 is_lock_held_by_thread(h_loader,
1223 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1224 THREAD);
1225 }
1226
1227 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1228 h_loader,
1229 Handle(),
1230 CHECK_NULL);
1231 #if INCLUDE_CDS
1232 if (k == NULL) {
1233 // If the class is not already loaded, try to see if it's in the shared
1234 // archive for the current classloader (h_loader).
1235 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
1236 klass_name, h_loader, CHECK_NULL);
1237 k = ik();
1238 }
1239 #endif
1240 return (k == NULL) ? NULL :
1241 (jclass) JNIHandles::make_local(env, k->java_mirror());
1242 JVM_END
1243
1244
1245 // Reflection support //////////////////////////////////////////////////////////////////////////////
1246
1247 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1248 assert (cls != NULL, "illegal class");
1249 JVMWrapper("JVM_GetClassName");
1250 JvmtiVMObjectAllocEventCollector oam;
1251 ResourceMark rm(THREAD);
1252 const char* name;
1253 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1254 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1255 } else {
1256 // Consider caching interned string in Klass
1257 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1258 assert(k->is_klass(), "just checking");
1259 name = k->external_name();
1260 }
1261 oop result = StringTable::intern((char*) name, CHECK_NULL);
1262 return (jstring) JNIHandles::make_local(env, result);
1263 JVM_END
1264
1265
1266 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1267 JVMWrapper("JVM_GetClassInterfaces");
1268 JvmtiVMObjectAllocEventCollector oam;
1269 oop mirror = JNIHandles::resolve_non_null(cls);
1270
1271 // Special handling for primitive objects
1272 if (java_lang_Class::is_primitive(mirror)) {
1273 // Primitive objects does not have any interfaces
1274 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1275 return (jobjectArray) JNIHandles::make_local(env, r);
1276 }
1277
1278 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
1279 // Figure size of result array
1280 int size;
1281 if (klass->oop_is_instance()) {
1282 size = InstanceKlass::cast(klass())->local_interfaces()->length();
1283 } else {
1284 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass");
1285 size = 2;
1286 }
1287
1288 // Allocate result array
1289 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1290 objArrayHandle result (THREAD, r);
1291 // Fill in result
1292 if (klass->oop_is_instance()) {
1293 // Regular instance klass, fill in all local interfaces
1294 for (int index = 0; index < size; index++) {
1295 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
1296 result->obj_at_put(index, k->java_mirror());
1297 }
1298 } else {
1299 // All arrays implement java.lang.Cloneable and java.io.Serializable
1300 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1301 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1302 }
1303 return (jobjectArray) JNIHandles::make_local(env, result());
1304 JVM_END
1305
1306
1307 JVM_ENTRY(jobject, JVM_GetClassLoader(JNIEnv *env, jclass cls))
1308 JVMWrapper("JVM_GetClassLoader");
1309 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1310 return NULL;
1311 }
1312 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1313 oop loader = k->class_loader();
1314 return JNIHandles::make_local(env, loader);
1315 JVM_END
1316
1317
1318 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1319 JVMWrapper("JVM_IsInterface");
1320 oop mirror = JNIHandles::resolve_non_null(cls);
1321 if (java_lang_Class::is_primitive(mirror)) {
1322 return JNI_FALSE;
1323 }
1324 Klass* k = java_lang_Class::as_Klass(mirror);
1325 jboolean result = k->is_interface();
1326 assert(!result || k->oop_is_instance(),
1327 "all interfaces are instance types");
1328 // The compiler intrinsic for isInterface tests the
1329 // Klass::_access_flags bits in the same way.
1330 return result;
1331 JVM_END
1332
1333
1334 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1335 JVMWrapper("JVM_GetClassSigners");
1336 JvmtiVMObjectAllocEventCollector oam;
1337 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1338 // There are no signers for primitive types
1339 return NULL;
1340 }
1341
1342 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1343
1344 // If there are no signers set in the class, or if the class
1345 // is an array, return NULL.
1346 if (signers == NULL) return NULL;
1347
1348 // copy of the signers array
1349 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1350 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1351 for (int index = 0; index < signers->length(); index++) {
1352 signers_copy->obj_at_put(index, signers->obj_at(index));
1353 }
1354
1355 // return the copy
1356 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1357 JVM_END
1358
1359
1360 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1361 JVMWrapper("JVM_SetClassSigners");
1362 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1363 // This call is ignored for primitive types and arrays.
1364 // Signers are only set once, ClassLoader.java, and thus shouldn't
1365 // be called with an array. Only the bootstrap loader creates arrays.
1366 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1367 if (k->oop_is_instance()) {
1368 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1369 }
1370 }
1371 JVM_END
1372
1373
1374 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1375 JVMWrapper("JVM_GetProtectionDomain");
1376 if (JNIHandles::resolve(cls) == NULL) {
1377 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1378 }
1379
1380 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1381 // Primitive types does not have a protection domain.
1382 return NULL;
1383 }
1384
1385 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1386 return (jobject) JNIHandles::make_local(env, pd);
1387 JVM_END
1388
1389
1390 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1391 // If there is a security manager and protection domain, check the access
1392 // in the protection domain, otherwise it is authorized.
1393 if (java_lang_System::has_security_manager()) {
1394
1395 // For bootstrapping, if pd implies method isn't in the JDK, allow
1396 // this context to revert to older behavior.
1397 // In this case the isAuthorized field in AccessControlContext is also not
1398 // present.
1399 if (Universe::protection_domain_implies_method() == NULL) {
1400 return true;
1401 }
1402
1403 // Whitelist certain access control contexts
1404 if (java_security_AccessControlContext::is_authorized(context)) {
1405 return true;
1406 }
1407
1408 oop prot = klass->protection_domain();
1409 if (prot != NULL) {
1410 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1411 // in the new wrapper.
1412 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1413 Handle h_prot(THREAD, prot);
1414 JavaValue result(T_BOOLEAN);
1415 JavaCallArguments args(h_prot);
1416 JavaCalls::call(&result, m, &args, CHECK_false);
1417 return (result.get_jboolean() != 0);
1418 }
1419 }
1420 return true;
1421 }
1422
1423 // Create an AccessControlContext with a protection domain with null codesource
1424 // and null permissions - which gives no permissions.
1425 oop create_dummy_access_control_context(TRAPS) {
1426 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass());
1427 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1428 // Call constructor ProtectionDomain(null, null);
1429 JavaValue result(T_VOID);
1430 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1431 vmSymbols::object_initializer_name(),
1432 vmSymbols::codesource_permissioncollection_signature(),
1433 Handle(), Handle(), CHECK_NULL);
1434
1435 // new ProtectionDomain[] {pd};
1436 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1437 context->obj_at_put(0, obj());
1438
1439 // new AccessControlContext(new ProtectionDomain[] {pd})
1440 objArrayHandle h_context(THREAD, context);
1441 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1442 return acc;
1443 }
1444
1445 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1446 JVMWrapper("JVM_DoPrivileged");
1447
1448 if (action == NULL) {
1449 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1450 }
1451
1452 // Compute the frame initiating the do privileged operation and setup the privileged stack
1453 vframeStream vfst(thread);
1454 vfst.security_get_caller_frame(1);
1455
1456 if (vfst.at_end()) {
1457 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1458 }
1459
1460 Method* method = vfst.method();
1461 instanceKlassHandle klass (THREAD, method->method_holder());
1462
1463 // Check that action object understands "Object run()"
1464 Handle h_context;
1465 if (context != NULL) {
1466 h_context = Handle(THREAD, JNIHandles::resolve(context));
1467 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1468 if (!authorized) {
1469 // Create an unprivileged access control object and call it's run function
1470 // instead.
1471 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1472 h_context = Handle(THREAD, noprivs);
1473 }
1474 }
1475
1476 // Check that action object understands "Object run()"
1477 Handle object (THREAD, JNIHandles::resolve(action));
1478
1479 // get run() method
1480 Method* m_oop = object->klass()->uncached_lookup_method(
1481 vmSymbols::run_method_name(),
1482 vmSymbols::void_object_signature(),
1483 Klass::find_overpass);
1484 methodHandle m (THREAD, m_oop);
1485 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1486 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1487 }
1488
1489 // Stack allocated list of privileged stack elements
1490 PrivilegedElement pi;
1491 if (!vfst.at_end()) {
1492 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1493 thread->set_privileged_stack_top(&pi);
1494 }
1495
1496
1497 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1498 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1499 Handle pending_exception;
1500 JavaValue result(T_OBJECT);
1501 JavaCallArguments args(object);
1502 JavaCalls::call(&result, m, &args, THREAD);
1503
1504 // done with action, remove ourselves from the list
1505 if (!vfst.at_end()) {
1506 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1507 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1508 }
1509
1510 if (HAS_PENDING_EXCEPTION) {
1511 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1512 CLEAR_PENDING_EXCEPTION;
1513 // JVMTI has already reported the pending exception
1514 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1515 if (THREAD->is_Java_thread()) {
1516 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1517 }
1518 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1519 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1520 // Throw a java.security.PrivilegedActionException(Exception e) exception
1521 JavaCallArguments args(pending_exception);
1522 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1523 vmSymbols::exception_void_signature(),
1524 &args);
1525 }
1526 }
1527
1528 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1529 return JNIHandles::make_local(env, (oop) result.get_jobject());
1530 JVM_END
1531
1532
1533 // Returns the inherited_access_control_context field of the running thread.
1534 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1535 JVMWrapper("JVM_GetInheritedAccessControlContext");
1536 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1537 return JNIHandles::make_local(env, result);
1538 JVM_END
1539
1540 class RegisterArrayForGC {
1541 private:
1542 JavaThread *_thread;
1543 public:
1544 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1545 _thread = thread;
1546 _thread->register_array_for_gc(array);
1547 }
1548
1549 ~RegisterArrayForGC() {
1550 _thread->register_array_for_gc(NULL);
1551 }
1552 };
1553
1554
1555 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1556 JVMWrapper("JVM_GetStackAccessControlContext");
1557 if (!UsePrivilegedStack) return NULL;
1558
1559 ResourceMark rm(THREAD);
1560 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1561 JvmtiVMObjectAllocEventCollector oam;
1562
1563 // count the protection domains on the execution stack. We collapse
1564 // duplicate consecutive protection domains into a single one, as
1565 // well as stopping when we hit a privileged frame.
1566
1567 // Use vframeStream to iterate through Java frames
1568 vframeStream vfst(thread);
1569
1570 oop previous_protection_domain = NULL;
1571 Handle privileged_context(thread, NULL);
1572 bool is_privileged = false;
1573 oop protection_domain = NULL;
1574
1575 for(; !vfst.at_end(); vfst.next()) {
1576 // get method of frame
1577 Method* method = vfst.method();
1578 intptr_t* frame_id = vfst.frame_id();
1579
1580 // check the privileged frames to see if we have a match
1581 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1582 // this frame is privileged
1583 is_privileged = true;
1584 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1585 protection_domain = thread->privileged_stack_top()->protection_domain();
1586 } else {
1587 protection_domain = method->method_holder()->protection_domain();
1588 }
1589
1590 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1591 local_array->push(protection_domain);
1592 previous_protection_domain = protection_domain;
1593 }
1594
1595 if (is_privileged) break;
1596 }
1597
1598
1599 // either all the domains on the stack were system domains, or
1600 // we had a privileged system domain
1601 if (local_array->is_empty()) {
1602 if (is_privileged && privileged_context.is_null()) return NULL;
1603
1604 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1605 return JNIHandles::make_local(env, result);
1606 }
1607
1608 // the resource area must be registered in case of a gc
1609 RegisterArrayForGC ragc(thread, local_array);
1610 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1611 local_array->length(), CHECK_NULL);
1612 objArrayHandle h_context(thread, context);
1613 for (int index = 0; index < local_array->length(); index++) {
1614 h_context->obj_at_put(index, local_array->at(index));
1615 }
1616
1617 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1618
1619 return JNIHandles::make_local(env, result);
1620 JVM_END
1621
1622
1623 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1624 JVMWrapper("JVM_IsArrayClass");
1625 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1626 return (k != NULL) && k->oop_is_array() ? true : false;
1627 JVM_END
1628
1629
1630 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1631 JVMWrapper("JVM_IsPrimitiveClass");
1632 oop mirror = JNIHandles::resolve_non_null(cls);
1633 return (jboolean) java_lang_Class::is_primitive(mirror);
1634 JVM_END
1635
1636
1637 JVM_ENTRY(jclass, JVM_GetComponentType(JNIEnv *env, jclass cls))
1638 JVMWrapper("JVM_GetComponentType");
1639 oop mirror = JNIHandles::resolve_non_null(cls);
1640 oop result = Reflection::array_component_type(mirror, CHECK_NULL);
1641 return (jclass) JNIHandles::make_local(env, result);
1642 JVM_END
1643
1644
1645 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1646 JVMWrapper("JVM_GetClassModifiers");
1647 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1648 // Primitive type
1649 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1650 }
1651
1652 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1653 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1654 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1655 return k->modifier_flags();
1656 JVM_END
1657
1658
1659 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1660
1661 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1662 JvmtiVMObjectAllocEventCollector oam;
1663 // ofClass is a reference to a java_lang_Class object. The mirror object
1664 // of an InstanceKlass
1665
1666 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1667 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1668 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1669 return (jobjectArray)JNIHandles::make_local(env, result);
1670 }
1671
1672 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1673 InnerClassesIterator iter(k);
1674
1675 if (iter.length() == 0) {
1676 // Neither an inner nor outer class
1677 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1678 return (jobjectArray)JNIHandles::make_local(env, result);
1679 }
1680
1681 // find inner class info
1682 constantPoolHandle cp(thread, k->constants());
1683 int length = iter.length();
1684
1685 // Allocate temp. result array
1686 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1687 objArrayHandle result (THREAD, r);
1688 int members = 0;
1689
1690 for (; !iter.done(); iter.next()) {
1691 int ioff = iter.inner_class_info_index();
1692 int ooff = iter.outer_class_info_index();
1693
1694 if (ioff != 0 && ooff != 0) {
1695 // Check to see if the name matches the class we're looking for
1696 // before attempting to find the class.
1697 if (cp->klass_name_at_matches(k, ooff)) {
1698 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1699 if (outer_klass == k()) {
1700 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1701 instanceKlassHandle inner_klass (THREAD, ik);
1702
1703 // Throws an exception if outer klass has not declared k as
1704 // an inner klass
1705 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1706
1707 result->obj_at_put(members, inner_klass->java_mirror());
1708 members++;
1709 }
1710 }
1711 }
1712 }
1713
1714 if (members != length) {
1715 // Return array of right length
1716 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1717 for(int i = 0; i < members; i++) {
1718 res->obj_at_put(i, result->obj_at(i));
1719 }
1720 return (jobjectArray)JNIHandles::make_local(env, res);
1721 }
1722
1723 return (jobjectArray)JNIHandles::make_local(env, result());
1724 JVM_END
1725
1726
1727 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1728 {
1729 // ofClass is a reference to a java_lang_Class object.
1730 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1731 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1732 return NULL;
1733 }
1734
1735 bool inner_is_member = false;
1736 Klass* outer_klass
1737 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1738 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1739 if (outer_klass == NULL) return NULL; // already a top-level class
1740 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1741 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1742 }
1743 JVM_END
1744
1745 // should be in InstanceKlass.cpp, but is here for historical reasons
1746 Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle k,
1747 bool* inner_is_member,
1748 TRAPS) {
1749 Thread* thread = THREAD;
1750 InnerClassesIterator iter(k);
1751 if (iter.length() == 0) {
1752 // No inner class info => no declaring class
1753 return NULL;
1754 }
1755
1756 constantPoolHandle i_cp(thread, k->constants());
1757
1758 bool found = false;
1759 Klass* ok;
1760 instanceKlassHandle outer_klass;
1761 *inner_is_member = false;
1762
1763 // Find inner_klass attribute
1764 for (; !iter.done() && !found; iter.next()) {
1765 int ioff = iter.inner_class_info_index();
1766 int ooff = iter.outer_class_info_index();
1767 int noff = iter.inner_name_index();
1768 if (ioff != 0) {
1769 // Check to see if the name matches the class we're looking for
1770 // before attempting to find the class.
1771 if (i_cp->klass_name_at_matches(k, ioff)) {
1772 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_NULL);
1773 found = (k() == inner_klass);
1774 if (found && ooff != 0) {
1775 ok = i_cp->klass_at(ooff, CHECK_NULL);
1776 outer_klass = instanceKlassHandle(thread, ok);
1777 *inner_is_member = true;
1778 }
1779 }
1780 }
1781 }
1782
1783 if (found && outer_klass.is_null()) {
1784 // It may be anonymous; try for that.
1785 int encl_method_class_idx = k->enclosing_method_class_index();
1786 if (encl_method_class_idx != 0) {
1787 ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
1788 outer_klass = instanceKlassHandle(thread, ok);
1789 *inner_is_member = false;
1790 }
1791 }
1792
1793 // If no inner class attribute found for this class.
1794 if (outer_klass.is_null()) return NULL;
1795
1796 // Throws an exception if outer klass has not declared k as an inner klass
1797 // We need evidence that each klass knows about the other, or else
1798 // the system could allow a spoof of an inner class to gain access rights.
1799 Reflection::check_for_inner_class(outer_klass, k, *inner_is_member, CHECK_NULL);
1800 return outer_klass();
1801 }
1802
1803 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1804 assert (cls != NULL, "illegal class");
1805 JVMWrapper("JVM_GetClassSignature");
1806 JvmtiVMObjectAllocEventCollector oam;
1807 ResourceMark rm(THREAD);
1808 // Return null for arrays and primatives
1809 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1810 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1811 if (k->oop_is_instance()) {
1812 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1813 if (sym == NULL) return NULL;
1814 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1815 return (jstring) JNIHandles::make_local(env, str());
1816 }
1817 }
1818 return NULL;
1819 JVM_END
1820
1821
1822 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1823 assert (cls != NULL, "illegal class");
1824 JVMWrapper("JVM_GetClassAnnotations");
1825
1826 // Return null for arrays and primitives
1827 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1828 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1829 if (k->oop_is_instance()) {
1830 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1831 return (jbyteArray) JNIHandles::make_local(env, a);
1832 }
1833 }
1834 return NULL;
1835 JVM_END
1836
1837
1838 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1839 // some of this code was adapted from from jni_FromReflectedField
1840
1841 oop reflected = JNIHandles::resolve_non_null(field);
1842 oop mirror = java_lang_reflect_Field::clazz(reflected);
1843 Klass* k = java_lang_Class::as_Klass(mirror);
1844 int slot = java_lang_reflect_Field::slot(reflected);
1845 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1846
1847 KlassHandle kh(THREAD, k);
1848 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1849
1850 if (modifiers & JVM_ACC_STATIC) {
1851 // for static fields we only look in the current class
1852 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1853 assert(false, "cannot find static field");
1854 return false;
1855 }
1856 } else {
1857 // for instance fields we start with the current class and work
1858 // our way up through the superclass chain
1859 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1860 assert(false, "cannot find instance field");
1861 return false;
1862 }
1863 }
1864 return true;
1865 }
1866
1867 JVM_ENTRY(jbyteArray, JVM_GetFieldAnnotations(JNIEnv *env, jobject field))
1868 // field is a handle to a java.lang.reflect.Field object
1869 assert(field != NULL, "illegal field");
1870 JVMWrapper("JVM_GetFieldAnnotations");
1871
1872 fieldDescriptor fd;
1873 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1874 if (!gotFd) {
1875 return NULL;
1876 }
1877
1878 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.annotations(), THREAD));
1879 JVM_END
1880
1881
1882 static Method* jvm_get_method_common(jobject method) {
1883 // some of this code was adapted from from jni_FromReflectedMethod
1884
1885 oop reflected = JNIHandles::resolve_non_null(method);
1886 oop mirror = NULL;
1887 int slot = 0;
1888
1889 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1890 mirror = java_lang_reflect_Constructor::clazz(reflected);
1891 slot = java_lang_reflect_Constructor::slot(reflected);
1892 } else {
1893 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1894 "wrong type");
1895 mirror = java_lang_reflect_Method::clazz(reflected);
1896 slot = java_lang_reflect_Method::slot(reflected);
1897 }
1898 Klass* k = java_lang_Class::as_Klass(mirror);
1899
1900 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1901 assert(m != NULL, "cannot find method");
1902 return m; // caller has to deal with NULL in product mode
1903 }
1904
1905
1906 JVM_ENTRY(jbyteArray, JVM_GetMethodAnnotations(JNIEnv *env, jobject method))
1907 JVMWrapper("JVM_GetMethodAnnotations");
1908
1909 // method is a handle to a java.lang.reflect.Method object
1910 Method* m = jvm_get_method_common(method);
1911 if (m == NULL) {
1912 return NULL;
1913 }
1914
1915 return (jbyteArray) JNIHandles::make_local(env,
1916 Annotations::make_java_array(m->annotations(), THREAD));
1917 JVM_END
1918
1919
1920 JVM_ENTRY(jbyteArray, JVM_GetMethodDefaultAnnotationValue(JNIEnv *env, jobject method))
1921 JVMWrapper("JVM_GetMethodDefaultAnnotationValue");
1922
1923 // method is a handle to a java.lang.reflect.Method object
1924 Method* m = jvm_get_method_common(method);
1925 if (m == NULL) {
1926 return NULL;
1927 }
1928
1929 return (jbyteArray) JNIHandles::make_local(env,
1930 Annotations::make_java_array(m->annotation_default(), THREAD));
1931 JVM_END
1932
1933
1934 JVM_ENTRY(jbyteArray, JVM_GetMethodParameterAnnotations(JNIEnv *env, jobject method))
1935 JVMWrapper("JVM_GetMethodParameterAnnotations");
1936
1937 // method is a handle to a java.lang.reflect.Method object
1938 Method* m = jvm_get_method_common(method);
1939 if (m == NULL) {
1940 return NULL;
1941 }
1942
1943 return (jbyteArray) JNIHandles::make_local(env,
1944 Annotations::make_java_array(m->parameter_annotations(), THREAD));
1945 JVM_END
1946
1947 /* Type use annotations support (JDK 1.8) */
1948
1949 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1950 assert (cls != NULL, "illegal class");
1951 JVMWrapper("JVM_GetClassTypeAnnotations");
1952 ResourceMark rm(THREAD);
1953 // Return null for arrays and primitives
1954 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1955 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1956 if (k->oop_is_instance()) {
1957 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1958 if (type_annotations != NULL) {
1959 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1960 return (jbyteArray) JNIHandles::make_local(env, a);
1961 }
1962 }
1963 }
1964 return NULL;
1965 JVM_END
1966
1967 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1968 assert (method != NULL, "illegal method");
1969 JVMWrapper("JVM_GetMethodTypeAnnotations");
1970
1971 // method is a handle to a java.lang.reflect.Method object
1972 Method* m = jvm_get_method_common(method);
1973 if (m == NULL) {
1974 return NULL;
1975 }
1976
1977 AnnotationArray* type_annotations = m->type_annotations();
1978 if (type_annotations != NULL) {
1979 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1980 return (jbyteArray) JNIHandles::make_local(env, a);
1981 }
1982
1983 return NULL;
1984 JVM_END
1985
1986 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1987 assert (field != NULL, "illegal field");
1988 JVMWrapper("JVM_GetFieldTypeAnnotations");
1989
1990 fieldDescriptor fd;
1991 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1992 if (!gotFd) {
1993 return NULL;
1994 }
1995
1996 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1997 JVM_END
1998
1999 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
2000 if (!cp->is_within_bounds(index)) {
2001 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
2002 }
2003 }
2004
2005 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
2006 {
2007 JVMWrapper("JVM_GetMethodParameters");
2008 // method is a handle to a java.lang.reflect.Method object
2009 Method* method_ptr = jvm_get_method_common(method);
2010 methodHandle mh (THREAD, method_ptr);
2011 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
2012 const int num_params = mh->method_parameters_length();
2013
2014 if (0 != num_params) {
2015 // make sure all the symbols are properly formatted
2016 for (int i = 0; i < num_params; i++) {
2017 MethodParametersElement* params = mh->method_parameters_start();
2018 int index = params[i].name_cp_index;
2019 bounds_check(mh->constants(), index, CHECK_NULL);
2020
2021 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
2022 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
2023 "Wrong type at constant pool index");
2024 }
2025
2026 }
2027
2028 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
2029 objArrayHandle result (THREAD, result_oop);
2030
2031 for (int i = 0; i < num_params; i++) {
2032 MethodParametersElement* params = mh->method_parameters_start();
2033 // For a 0 index, give a NULL symbol
2034 Symbol* sym = 0 != params[i].name_cp_index ?
2035 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
2036 int flags = params[i].flags;
2037 oop param = Reflection::new_parameter(reflected_method, i, sym,
2038 flags, CHECK_NULL);
2039 result->obj_at_put(i, param);
2040 }
2041 return (jobjectArray)JNIHandles::make_local(env, result());
2042 } else {
2043 return (jobjectArray)NULL;
2044 }
2045 }
2046 JVM_END
2047
2048 // New (JDK 1.4) reflection implementation /////////////////////////////////////
2049
2050 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2051 {
2052 JVMWrapper("JVM_GetClassDeclaredFields");
2053 JvmtiVMObjectAllocEventCollector oam;
2054
2055 // Exclude primitive types and array types
2056 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
2057 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
2058 // Return empty array
2059 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
2060 return (jobjectArray) JNIHandles::make_local(env, res);
2061 }
2062
2063 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
2064 constantPoolHandle cp(THREAD, k->constants());
2065
2066 // Ensure class is linked
2067 k->link_class(CHECK_NULL);
2068
2069 // 4496456 We need to filter out java.lang.Throwable.backtrace
2070 bool skip_backtrace = false;
2071
2072 // Allocate result
2073 int num_fields;
2074
2075 if (publicOnly) {
2076 num_fields = 0;
2077 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
2078 if (fs.access_flags().is_public()) ++num_fields;
2079 }
2080 } else {
2081 num_fields = k->java_fields_count();
2082
2083 if (k() == SystemDictionary::Throwable_klass()) {
2084 num_fields--;
2085 skip_backtrace = true;
2086 }
2087 }
2088
2089 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
2090 objArrayHandle result (THREAD, r);
2091
2092 int out_idx = 0;
2093 fieldDescriptor fd;
2094 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
2095 if (skip_backtrace) {
2096 // 4496456 skip java.lang.Throwable.backtrace
2097 int offset = fs.offset();
2098 if (offset == java_lang_Throwable::get_backtrace_offset()) continue;
2099 }
2100
2101 if (!publicOnly || fs.access_flags().is_public()) {
2102 fd.reinitialize(k(), fs.index());
2103 oop field = Reflection::new_field(&fd, UseNewReflection, CHECK_NULL);
2104 result->obj_at_put(out_idx, field);
2105 ++out_idx;
2106 }
2107 }
2108 assert(out_idx == num_fields, "just checking");
2109 return (jobjectArray) JNIHandles::make_local(env, result());
2110 }
2111 JVM_END
2112
2113 static bool select_method(methodHandle method, bool want_constructor) {
2114 if (want_constructor) {
2115 return (method->is_initializer() && !method->is_static());
2116 } else {
2117 return (!method->is_initializer() && !method->is_overpass());
2118 }
2119 }
2120
2121 static jobjectArray get_class_declared_methods_helper(
2122 JNIEnv *env,
2123 jclass ofClass, jboolean publicOnly,
2124 bool want_constructor,
2125 Klass* klass, TRAPS) {
2126
2127 JvmtiVMObjectAllocEventCollector oam;
2128
2129 // Exclude primitive types and array types
2130 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
2131 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
2132 // Return empty array
2133 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
2134 return (jobjectArray) JNIHandles::make_local(env, res);
2135 }
2136
2137 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
2138
2139 // Ensure class is linked
2140 k->link_class(CHECK_NULL);
2141
2142 Array<Method*>* methods = k->methods();
2143 int methods_length = methods->length();
2144
2145 // Save original method_idnum in case of redefinition, which can change
2146 // the idnum of obsolete methods. The new method will have the same idnum
2147 // but if we refresh the methods array, the counts will be wrong.
2148 ResourceMark rm(THREAD);
2149 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
2150 int num_methods = 0;
2151
2152 for (int i = 0; i < methods_length; i++) {
2153 methodHandle method(THREAD, methods->at(i));
2154 if (select_method(method, want_constructor)) {
2155 if (!publicOnly || method->is_public()) {
2156 idnums->push(method->method_idnum());
2157 ++num_methods;
2158 }
2159 }
2160 }
2161
2162 // Allocate result
2163 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
2164 objArrayHandle result (THREAD, r);
2165
2166 // Now just put the methods that we selected above, but go by their idnum
2167 // in case of redefinition. The methods can be redefined at any safepoint,
2168 // so above when allocating the oop array and below when creating reflect
2169 // objects.
2170 for (int i = 0; i < num_methods; i++) {
2171 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
2172 if (method.is_null()) {
2173 // Method may have been deleted and seems this API can handle null
2174 // Otherwise should probably put a method that throws NSME
2175 result->obj_at_put(i, NULL);
2176 } else {
2177 oop m;
2178 if (want_constructor) {
2179 m = Reflection::new_constructor(method, CHECK_NULL);
2180 } else {
2181 m = Reflection::new_method(method, UseNewReflection, false, CHECK_NULL);
2182 }
2183 result->obj_at_put(i, m);
2184 }
2185 }
2186
2187 return (jobjectArray) JNIHandles::make_local(env, result());
2188 }
2189
2190 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2191 {
2192 JVMWrapper("JVM_GetClassDeclaredMethods");
2193 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2194 /*want_constructor*/ false,
2195 SystemDictionary::reflect_Method_klass(), THREAD);
2196 }
2197 JVM_END
2198
2199 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2200 {
2201 JVMWrapper("JVM_GetClassDeclaredConstructors");
2202 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2203 /*want_constructor*/ true,
2204 SystemDictionary::reflect_Constructor_klass(), THREAD);
2205 }
2206 JVM_END
2207
2208 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
2209 {
2210 JVMWrapper("JVM_GetClassAccessFlags");
2211 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2212 // Primitive type
2213 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
2214 }
2215
2216 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2217 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
2218 }
2219 JVM_END
2220
2221
2222 // Constant pool access //////////////////////////////////////////////////////////
2223
2224 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2225 {
2226 JVMWrapper("JVM_GetClassConstantPool");
2227 JvmtiVMObjectAllocEventCollector oam;
2228
2229 // Return null for primitives and arrays
2230 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2231 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2232 if (k->oop_is_instance()) {
2233 instanceKlassHandle k_h(THREAD, k);
2234 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL);
2235 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2236 return JNIHandles::make_local(jcp());
2237 }
2238 }
2239 return NULL;
2240 }
2241 JVM_END
2242
2243
2244 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2245 {
2246 JVMWrapper("JVM_ConstantPoolGetSize");
2247 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2248 return cp->length();
2249 }
2250 JVM_END
2251
2252
2253 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2254 {
2255 JVMWrapper("JVM_ConstantPoolGetClassAt");
2256 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2257 bounds_check(cp, index, CHECK_NULL);
2258 constantTag tag = cp->tag_at(index);
2259 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2260 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2261 }
2262 Klass* k = cp->klass_at(index, CHECK_NULL);
2263 return (jclass) JNIHandles::make_local(k->java_mirror());
2264 }
2265 JVM_END
2266
2267 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2268 {
2269 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2270 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2271 bounds_check(cp, index, CHECK_NULL);
2272 constantTag tag = cp->tag_at(index);
2273 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2274 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2275 }
2276 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2277 if (k == NULL) return NULL;
2278 return (jclass) JNIHandles::make_local(k->java_mirror());
2279 }
2280 JVM_END
2281
2282 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2283 constantTag tag = cp->tag_at(index);
2284 if (!tag.is_method() && !tag.is_interface_method()) {
2285 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2286 }
2287 int klass_ref = cp->uncached_klass_ref_index_at(index);
2288 Klass* k_o;
2289 if (force_resolution) {
2290 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2291 } else {
2292 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2293 if (k_o == NULL) return NULL;
2294 }
2295 instanceKlassHandle k(THREAD, k_o);
2296 Symbol* name = cp->uncached_name_ref_at(index);
2297 Symbol* sig = cp->uncached_signature_ref_at(index);
2298 methodHandle m (THREAD, k->find_method(name, sig));
2299 if (m.is_null()) {
2300 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2301 }
2302 oop method;
2303 if (!m->is_initializer() || m->is_static()) {
2304 method = Reflection::new_method(m, true, true, CHECK_NULL);
2305 } else {
2306 method = Reflection::new_constructor(m, CHECK_NULL);
2307 }
2308 return JNIHandles::make_local(method);
2309 }
2310
2311 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2312 {
2313 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2314 JvmtiVMObjectAllocEventCollector oam;
2315 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2316 bounds_check(cp, index, CHECK_NULL);
2317 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2318 return res;
2319 }
2320 JVM_END
2321
2322 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2323 {
2324 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2325 JvmtiVMObjectAllocEventCollector oam;
2326 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2327 bounds_check(cp, index, CHECK_NULL);
2328 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2329 return res;
2330 }
2331 JVM_END
2332
2333 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2334 constantTag tag = cp->tag_at(index);
2335 if (!tag.is_field()) {
2336 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2337 }
2338 int klass_ref = cp->uncached_klass_ref_index_at(index);
2339 Klass* k_o;
2340 if (force_resolution) {
2341 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2342 } else {
2343 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2344 if (k_o == NULL) return NULL;
2345 }
2346 instanceKlassHandle k(THREAD, k_o);
2347 Symbol* name = cp->uncached_name_ref_at(index);
2348 Symbol* sig = cp->uncached_signature_ref_at(index);
2349 fieldDescriptor fd;
2350 Klass* target_klass = k->find_field(name, sig, &fd);
2351 if (target_klass == NULL) {
2352 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2353 }
2354 oop field = Reflection::new_field(&fd, true, CHECK_NULL);
2355 return JNIHandles::make_local(field);
2356 }
2357
2358 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2359 {
2360 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2361 JvmtiVMObjectAllocEventCollector oam;
2362 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2363 bounds_check(cp, index, CHECK_NULL);
2364 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2365 return res;
2366 }
2367 JVM_END
2368
2369 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2370 {
2371 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2372 JvmtiVMObjectAllocEventCollector oam;
2373 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2374 bounds_check(cp, index, CHECK_NULL);
2375 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2376 return res;
2377 }
2378 JVM_END
2379
2380 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2381 {
2382 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2383 JvmtiVMObjectAllocEventCollector oam;
2384 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2385 bounds_check(cp, index, CHECK_NULL);
2386 constantTag tag = cp->tag_at(index);
2387 if (!tag.is_field_or_method()) {
2388 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2389 }
2390 int klass_ref = cp->uncached_klass_ref_index_at(index);
2391 Symbol* klass_name = cp->klass_name_at(klass_ref);
2392 Symbol* member_name = cp->uncached_name_ref_at(index);
2393 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2394 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2395 objArrayHandle dest(THREAD, dest_o);
2396 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2397 dest->obj_at_put(0, str());
2398 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2399 dest->obj_at_put(1, str());
2400 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2401 dest->obj_at_put(2, str());
2402 return (jobjectArray) JNIHandles::make_local(dest());
2403 }
2404 JVM_END
2405
2406 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2407 {
2408 JVMWrapper("JVM_ConstantPoolGetIntAt");
2409 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2410 bounds_check(cp, index, CHECK_0);
2411 constantTag tag = cp->tag_at(index);
2412 if (!tag.is_int()) {
2413 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2414 }
2415 return cp->int_at(index);
2416 }
2417 JVM_END
2418
2419 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2420 {
2421 JVMWrapper("JVM_ConstantPoolGetLongAt");
2422 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2423 bounds_check(cp, index, CHECK_(0L));
2424 constantTag tag = cp->tag_at(index);
2425 if (!tag.is_long()) {
2426 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2427 }
2428 return cp->long_at(index);
2429 }
2430 JVM_END
2431
2432 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2433 {
2434 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2435 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2436 bounds_check(cp, index, CHECK_(0.0f));
2437 constantTag tag = cp->tag_at(index);
2438 if (!tag.is_float()) {
2439 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2440 }
2441 return cp->float_at(index);
2442 }
2443 JVM_END
2444
2445 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2446 {
2447 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2448 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2449 bounds_check(cp, index, CHECK_(0.0));
2450 constantTag tag = cp->tag_at(index);
2451 if (!tag.is_double()) {
2452 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2453 }
2454 return cp->double_at(index);
2455 }
2456 JVM_END
2457
2458 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2459 {
2460 JVMWrapper("JVM_ConstantPoolGetStringAt");
2461 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2462 bounds_check(cp, index, CHECK_NULL);
2463 constantTag tag = cp->tag_at(index);
2464 if (!tag.is_string()) {
2465 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2466 }
2467 oop str = cp->string_at(index, CHECK_NULL);
2468 return (jstring) JNIHandles::make_local(str);
2469 }
2470 JVM_END
2471
2472 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2473 {
2474 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2475 JvmtiVMObjectAllocEventCollector oam;
2476 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2477 bounds_check(cp, index, CHECK_NULL);
2478 constantTag tag = cp->tag_at(index);
2479 if (!tag.is_symbol()) {
2480 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2481 }
2482 Symbol* sym = cp->symbol_at(index);
2483 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2484 return (jstring) JNIHandles::make_local(str());
2485 }
2486 JVM_END
2487
2488
2489 // Assertion support. //////////////////////////////////////////////////////////
2490
2491 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2492 JVMWrapper("JVM_DesiredAssertionStatus");
2493 assert(cls != NULL, "bad class");
2494
2495 oop r = JNIHandles::resolve(cls);
2496 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2497 if (java_lang_Class::is_primitive(r)) return false;
2498
2499 Klass* k = java_lang_Class::as_Klass(r);
2500 assert(k->oop_is_instance(), "must be an instance klass");
2501 if (! k->oop_is_instance()) return false;
2502
2503 ResourceMark rm(THREAD);
2504 const char* name = k->name()->as_C_string();
2505 bool system_class = k->class_loader() == NULL;
2506 return JavaAssertions::enabled(name, system_class);
2507
2508 JVM_END
2509
2510
2511 // Return a new AssertionStatusDirectives object with the fields filled in with
2512 // command-line assertion arguments (i.e., -ea, -da).
2513 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2514 JVMWrapper("JVM_AssertionStatusDirectives");
2515 JvmtiVMObjectAllocEventCollector oam;
2516 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2517 return JNIHandles::make_local(env, asd);
2518 JVM_END
2519
2520 // Verification ////////////////////////////////////////////////////////////////////////////////
2521
2522 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2523
2524 // RedefineClasses support: bug 6214132 caused verification to fail.
2525 // All functions from this section should call the jvmtiThreadSate function:
2526 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2527 // The function returns a Klass* of the _scratch_class if the verifier
2528 // was invoked in the middle of the class redefinition.
2529 // Otherwise it returns its argument value which is the _the_class Klass*.
2530 // Please, refer to the description in the jvmtiThreadSate.hpp.
2531
2532 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2533 JVMWrapper("JVM_GetClassNameUTF");
2534 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2535 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2536 return k->name()->as_utf8();
2537 JVM_END
2538
2539
2540 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2541 JVMWrapper("JVM_GetClassCPTypes");
2542 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2543 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2544 // types will have length zero if this is not an InstanceKlass
2545 // (length is determined by call to JVM_GetClassCPEntriesCount)
2546 if (k->oop_is_instance()) {
2547 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2548 for (int index = cp->length() - 1; index >= 0; index--) {
2549 constantTag tag = cp->tag_at(index);
2550 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2551 }
2552 }
2553 JVM_END
2554
2555
2556 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2557 JVMWrapper("JVM_GetClassCPEntriesCount");
2558 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2559 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2560 if (!k->oop_is_instance())
2561 return 0;
2562 return InstanceKlass::cast(k)->constants()->length();
2563 JVM_END
2564
2565
2566 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2567 JVMWrapper("JVM_GetClassFieldsCount");
2568 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2569 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2570 if (!k->oop_is_instance())
2571 return 0;
2572 return InstanceKlass::cast(k)->java_fields_count();
2573 JVM_END
2574
2575
2576 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2577 JVMWrapper("JVM_GetClassMethodsCount");
2578 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2579 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2580 if (!k->oop_is_instance())
2581 return 0;
2582 return InstanceKlass::cast(k)->methods()->length();
2583 JVM_END
2584
2585
2586 // The following methods, used for the verifier, are never called with
2587 // array klasses, so a direct cast to InstanceKlass is safe.
2588 // Typically, these methods are called in a loop with bounds determined
2589 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2590 // zero for arrays.
2591 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2592 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2593 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2594 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2595 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2596 int length = method->checked_exceptions_length();
2597 if (length > 0) {
2598 CheckedExceptionElement* table= method->checked_exceptions_start();
2599 for (int i = 0; i < length; i++) {
2600 exceptions[i] = table[i].class_cp_index;
2601 }
2602 }
2603 JVM_END
2604
2605
2606 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2607 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2608 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2609 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2610 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2611 return method->checked_exceptions_length();
2612 JVM_END
2613
2614
2615 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2616 JVMWrapper("JVM_GetMethodIxByteCode");
2617 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2618 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2619 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2620 memcpy(code, method->code_base(), method->code_size());
2621 JVM_END
2622
2623
2624 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2625 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2626 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2627 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2628 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2629 return method->code_size();
2630 JVM_END
2631
2632
2633 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2634 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2635 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2636 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2637 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2638 ExceptionTable extable(method);
2639 entry->start_pc = extable.start_pc(entry_index);
2640 entry->end_pc = extable.end_pc(entry_index);
2641 entry->handler_pc = extable.handler_pc(entry_index);
2642 entry->catchType = extable.catch_type_index(entry_index);
2643 JVM_END
2644
2645
2646 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2647 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2648 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2649 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2650 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2651 return method->exception_table_length();
2652 JVM_END
2653
2654
2655 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2656 JVMWrapper("JVM_GetMethodIxModifiers");
2657 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2658 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2659 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2660 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2661 JVM_END
2662
2663
2664 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2665 JVMWrapper("JVM_GetFieldIxModifiers");
2666 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2667 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2668 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2669 JVM_END
2670
2671
2672 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2673 JVMWrapper("JVM_GetMethodIxLocalsCount");
2674 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2675 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2676 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2677 return method->max_locals();
2678 JVM_END
2679
2680
2681 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2682 JVMWrapper("JVM_GetMethodIxArgsSize");
2683 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2684 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2685 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2686 return method->size_of_parameters();
2687 JVM_END
2688
2689
2690 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2691 JVMWrapper("JVM_GetMethodIxMaxStack");
2692 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2693 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2694 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2695 return method->verifier_max_stack();
2696 JVM_END
2697
2698
2699 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2700 JVMWrapper("JVM_IsConstructorIx");
2701 ResourceMark rm(THREAD);
2702 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2703 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2704 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2705 return method->name() == vmSymbols::object_initializer_name();
2706 JVM_END
2707
2708
2709 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2710 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2711 ResourceMark rm(THREAD);
2712 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2713 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2714 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2715 return method->is_overpass();
2716 JVM_END
2717
2718 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2719 JVMWrapper("JVM_GetMethodIxIxUTF");
2720 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2721 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2722 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2723 return method->name()->as_utf8();
2724 JVM_END
2725
2726
2727 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2728 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2729 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2730 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2731 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2732 return method->signature()->as_utf8();
2733 JVM_END
2734
2735 /**
2736 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2737 * read entries in the constant pool. Since the old verifier always
2738 * works on a copy of the code, it will not see any rewriting that
2739 * may possibly occur in the middle of verification. So it is important
2740 * that nothing it calls tries to use the cpCache instead of the raw
2741 * constant pool, so we must use cp->uncached_x methods when appropriate.
2742 */
2743 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2744 JVMWrapper("JVM_GetCPFieldNameUTF");
2745 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2746 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2747 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2748 switch (cp->tag_at(cp_index).value()) {
2749 case JVM_CONSTANT_Fieldref:
2750 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2751 default:
2752 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2753 }
2754 ShouldNotReachHere();
2755 return NULL;
2756 JVM_END
2757
2758
2759 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2760 JVMWrapper("JVM_GetCPMethodNameUTF");
2761 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2762 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2763 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2764 switch (cp->tag_at(cp_index).value()) {
2765 case JVM_CONSTANT_InterfaceMethodref:
2766 case JVM_CONSTANT_Methodref:
2767 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2768 default:
2769 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2770 }
2771 ShouldNotReachHere();
2772 return NULL;
2773 JVM_END
2774
2775
2776 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2777 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2778 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2779 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2780 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2781 switch (cp->tag_at(cp_index).value()) {
2782 case JVM_CONSTANT_InterfaceMethodref:
2783 case JVM_CONSTANT_Methodref:
2784 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2785 default:
2786 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2787 }
2788 ShouldNotReachHere();
2789 return NULL;
2790 JVM_END
2791
2792
2793 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2794 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2795 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2796 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2797 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2798 switch (cp->tag_at(cp_index).value()) {
2799 case JVM_CONSTANT_Fieldref:
2800 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2801 default:
2802 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2803 }
2804 ShouldNotReachHere();
2805 return NULL;
2806 JVM_END
2807
2808
2809 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2810 JVMWrapper("JVM_GetCPClassNameUTF");
2811 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2812 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2813 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2814 Symbol* classname = cp->klass_name_at(cp_index);
2815 return classname->as_utf8();
2816 JVM_END
2817
2818
2819 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2820 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2821 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2822 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2823 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2824 switch (cp->tag_at(cp_index).value()) {
2825 case JVM_CONSTANT_Fieldref: {
2826 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2827 Symbol* classname = cp->klass_name_at(class_index);
2828 return classname->as_utf8();
2829 }
2830 default:
2831 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2832 }
2833 ShouldNotReachHere();
2834 return NULL;
2835 JVM_END
2836
2837
2838 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2839 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2840 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2841 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2842 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2843 switch (cp->tag_at(cp_index).value()) {
2844 case JVM_CONSTANT_Methodref:
2845 case JVM_CONSTANT_InterfaceMethodref: {
2846 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2847 Symbol* classname = cp->klass_name_at(class_index);
2848 return classname->as_utf8();
2849 }
2850 default:
2851 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2852 }
2853 ShouldNotReachHere();
2854 return NULL;
2855 JVM_END
2856
2857
2858 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2859 JVMWrapper("JVM_GetCPFieldModifiers");
2860 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2861 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2862 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2863 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2864 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2865 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2866 switch (cp->tag_at(cp_index).value()) {
2867 case JVM_CONSTANT_Fieldref: {
2868 Symbol* name = cp->uncached_name_ref_at(cp_index);
2869 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2870 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2871 if (fs.name() == name && fs.signature() == signature) {
2872 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2873 }
2874 }
2875 return -1;
2876 }
2877 default:
2878 fatal("JVM_GetCPFieldModifiers: illegal constant");
2879 }
2880 ShouldNotReachHere();
2881 return 0;
2882 JVM_END
2883
2884
2885 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2886 JVMWrapper("JVM_GetCPMethodModifiers");
2887 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2888 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2889 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2890 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2891 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2892 switch (cp->tag_at(cp_index).value()) {
2893 case JVM_CONSTANT_Methodref:
2894 case JVM_CONSTANT_InterfaceMethodref: {
2895 Symbol* name = cp->uncached_name_ref_at(cp_index);
2896 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2897 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2898 int methods_count = methods->length();
2899 for (int i = 0; i < methods_count; i++) {
2900 Method* method = methods->at(i);
2901 if (method->name() == name && method->signature() == signature) {
2902 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2903 }
2904 }
2905 return -1;
2906 }
2907 default:
2908 fatal("JVM_GetCPMethodModifiers: illegal constant");
2909 }
2910 ShouldNotReachHere();
2911 return 0;
2912 JVM_END
2913
2914
2915 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2916
2917 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2918 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2919 JVM_END
2920
2921
2922 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2923 JVMWrapper("JVM_IsSameClassPackage");
2924 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2925 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2926 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2927 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2928 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2929 JVM_END
2930
2931
2932 // IO functions ////////////////////////////////////////////////////////////////////////////////////////
2933
2934 JVM_LEAF(jint, JVM_Open(const char *fname, jint flags, jint mode))
2935 JVMWrapper2("JVM_Open (%s)", fname);
2936
2937 //%note jvm_r6
2938 int result = os::open(fname, flags, mode);
2939 if (result >= 0) {
2940 return result;
2941 } else {
2942 switch(errno) {
2943 case EEXIST:
2944 return JVM_EEXIST;
2945 default:
2946 return -1;
2947 }
2948 }
2949 JVM_END
2950
2951
2952 JVM_LEAF(jint, JVM_Close(jint fd))
2953 JVMWrapper2("JVM_Close (0x%x)", fd);
2954 //%note jvm_r6
2955 return os::close(fd);
2956 JVM_END
2957
2958
2959 JVM_LEAF(jint, JVM_Read(jint fd, char *buf, jint nbytes))
2960 JVMWrapper2("JVM_Read (0x%x)", fd);
2961
2962 //%note jvm_r6
2963 return (jint)os::restartable_read(fd, buf, nbytes);
2964 JVM_END
2965
2966
2967 JVM_LEAF(jint, JVM_Write(jint fd, char *buf, jint nbytes))
2968 JVMWrapper2("JVM_Write (0x%x)", fd);
2969
2970 //%note jvm_r6
2971 return (jint)os::write(fd, buf, nbytes);
2972 JVM_END
2973
2974
2975 JVM_LEAF(jint, JVM_Available(jint fd, jlong *pbytes))
2976 JVMWrapper2("JVM_Available (0x%x)", fd);
2977 //%note jvm_r6
2978 return os::available(fd, pbytes);
2979 JVM_END
2980
2981
2982 JVM_LEAF(jlong, JVM_Lseek(jint fd, jlong offset, jint whence))
2983 JVMWrapper4("JVM_Lseek (0x%x, " INT64_FORMAT ", %d)", fd, (int64_t) offset, whence);
2984 //%note jvm_r6
2985 return os::lseek(fd, offset, whence);
2986 JVM_END
2987
2988
2989 JVM_LEAF(jint, JVM_SetLength(jint fd, jlong length))
2990 JVMWrapper3("JVM_SetLength (0x%x, " INT64_FORMAT ")", fd, (int64_t) length);
2991 return os::ftruncate(fd, length);
2992 JVM_END
2993
2994
2995 JVM_LEAF(jint, JVM_Sync(jint fd))
2996 JVMWrapper2("JVM_Sync (0x%x)", fd);
2997 //%note jvm_r6
2998 return os::fsync(fd);
2999 JVM_END
3000
3001
3002 // Printing support //////////////////////////////////////////////////
3003 extern "C" {
3004
3005 ATTRIBUTE_PRINTF(3, 0)
3006 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
3007 // Reject count values that are negative signed values converted to
3008 // unsigned; see bug 4399518, 4417214
3009 if ((intptr_t)count <= 0) return -1;
3010
3011 int result = os::vsnprintf(str, count, fmt, args);
3012 if (result > 0 && (size_t)result >= count) {
3013 result = -1;
3014 }
3015
3016 return result;
3017 }
3018
3019 ATTRIBUTE_PRINTF(3, 0)
3020 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
3021 va_list args;
3022 int len;
3023 va_start(args, fmt);
3024 len = jio_vsnprintf(str, count, fmt, args);
3025 va_end(args);
3026 return len;
3027 }
3028
3029 ATTRIBUTE_PRINTF(2,3)
3030 int jio_fprintf(FILE* f, const char *fmt, ...) {
3031 int len;
3032 va_list args;
3033 va_start(args, fmt);
3034 len = jio_vfprintf(f, fmt, args);
3035 va_end(args);
3036 return len;
3037 }
3038
3039 ATTRIBUTE_PRINTF(2, 0)
3040 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
3041 if (Arguments::vfprintf_hook() != NULL) {
3042 return Arguments::vfprintf_hook()(f, fmt, args);
3043 } else {
3044 return vfprintf(f, fmt, args);
3045 }
3046 }
3047
3048 ATTRIBUTE_PRINTF(1, 2)
3049 JNIEXPORT int jio_printf(const char *fmt, ...) {
3050 int len;
3051 va_list args;
3052 va_start(args, fmt);
3053 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
3054 va_end(args);
3055 return len;
3056 }
3057
3058
3059 // HotSpot specific jio method
3060 void jio_print(const char* s) {
3061 // Try to make this function as atomic as possible.
3062 if (Arguments::vfprintf_hook() != NULL) {
3063 jio_fprintf(defaultStream::output_stream(), "%s", s);
3064 } else {
3065 // Make an unused local variable to avoid warning from gcc 4.x compiler.
3066 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
3067 }
3068 }
3069
3070 } // Extern C
3071
3072 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
3073
3074 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
3075 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
3076 // OSThread objects. The exception to this rule is when the target object is the thread
3077 // doing the operation, in which case we know that the thread won't exit until the
3078 // operation is done (all exits being voluntary). There are a few cases where it is
3079 // rather silly to do operations on yourself, like resuming yourself or asking whether
3080 // you are alive. While these can still happen, they are not subject to deadlocks if
3081 // the lock is held while the operation occurs (this is not the case for suspend, for
3082 // instance), and are very unlikely. Because IsAlive needs to be fast and its
3083 // implementation is local to this file, we always lock Threads_lock for that one.
3084
3085 static void thread_entry(JavaThread* thread, TRAPS) {
3086 HandleMark hm(THREAD);
3087 Handle obj(THREAD, thread->threadObj());
3088 JavaValue result(T_VOID);
3089 JavaCalls::call_virtual(&result,
3090 obj,
3091 KlassHandle(THREAD, SystemDictionary::Thread_klass()),
3092 vmSymbols::run_method_name(),
3093 vmSymbols::void_method_signature(),
3094 THREAD);
3095 }
3096
3097
3098 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3099 JVMWrapper("JVM_StartThread");
3100 JavaThread *native_thread = NULL;
3101
3102 // We cannot hold the Threads_lock when we throw an exception,
3103 // due to rank ordering issues. Example: we might need to grab the
3104 // Heap_lock while we construct the exception.
3105 bool throw_illegal_thread_state = false;
3106
3107 // We must release the Threads_lock before we can post a jvmti event
3108 // in Thread::start.
3109 {
3110 // Ensure that the C++ Thread and OSThread structures aren't freed before
3111 // we operate.
3112 MutexLocker mu(Threads_lock);
3113
3114 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3115 // re-starting an already started thread, so we should usually find
3116 // that the JavaThread is null. However for a JNI attached thread
3117 // there is a small window between the Thread object being created
3118 // (with its JavaThread set) and the update to its threadStatus, so we
3119 // have to check for this
3120 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
3121 throw_illegal_thread_state = true;
3122 } else {
3123 // We could also check the stillborn flag to see if this thread was already stopped, but
3124 // for historical reasons we let the thread detect that itself when it starts running
3125
3126 jlong size =
3127 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3128 // Allocate the C++ Thread structure and create the native thread. The
3129 // stack size retrieved from java is signed, but the constructor takes
3130 // size_t (an unsigned type), so avoid passing negative values which would
3131 // result in really large stacks.
3132 size_t sz = size > 0 ? (size_t) size : 0;
3133 native_thread = new JavaThread(&thread_entry, sz);
3134
3135 // At this point it may be possible that no osthread was created for the
3136 // JavaThread due to lack of memory. Check for this situation and throw
3137 // an exception if necessary. Eventually we may want to change this so
3138 // that we only grab the lock if the thread was created successfully -
3139 // then we can also do this check and throw the exception in the
3140 // JavaThread constructor.
3141 if (native_thread->osthread() != NULL) {
3142 // Note: the current thread is not being used within "prepare".
3143 native_thread->prepare(jthread);
3144 }
3145 }
3146 }
3147
3148 if (throw_illegal_thread_state) {
3149 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3150 }
3151
3152 assert(native_thread != NULL, "Starting null thread?");
3153
3154 if (native_thread->osthread() == NULL) {
3155 // No one should hold a reference to the 'native_thread'.
3156 delete native_thread;
3157 if (JvmtiExport::should_post_resource_exhausted()) {
3158 JvmtiExport::post_resource_exhausted(
3159 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3160 "unable to create new native thread");
3161 }
3162 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3163 "unable to create new native thread");
3164 }
3165
3166 #if INCLUDE_JFR
3167 if (JfrRecorder::is_recording() && EventThreadStart::is_enabled() &&
3168 EventThreadStart::is_stacktrace_enabled()) {
3169 JfrThreadLocal* tl = native_thread->jfr_thread_local();
3170 // skip Thread.start() and Thread.start0()
3171 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2));
3172 }
3173 #endif
3174
3175 Thread::start(native_thread);
3176
3177 JVM_END
3178
3179 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3180 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
3181 // but is thought to be reliable and simple. In the case, where the receiver is the
3182 // same thread as the sender, no safepoint is needed.
3183 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3184 JVMWrapper("JVM_StopThread");
3185
3186 oop java_throwable = JNIHandles::resolve(throwable);
3187 if (java_throwable == NULL) {
3188 THROW(vmSymbols::java_lang_NullPointerException());
3189 }
3190 oop java_thread = JNIHandles::resolve_non_null(jthread);
3191 JavaThread* receiver = java_lang_Thread::thread(java_thread);
3192 Events::log_exception(JavaThread::current(),
3193 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3194 p2i(receiver), p2i((address)java_thread), p2i(throwable));
3195 // First check if thread is alive
3196 if (receiver != NULL) {
3197 // Check if exception is getting thrown at self (use oop equality, since the
3198 // target object might exit)
3199 if (java_thread == thread->threadObj()) {
3200 THROW_OOP(java_throwable);
3201 } else {
3202 // Enques a VM_Operation to stop all threads and then deliver the exception...
3203 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
3204 }
3205 }
3206 else {
3207 // Either:
3208 // - target thread has not been started before being stopped, or
3209 // - target thread already terminated
3210 // We could read the threadStatus to determine which case it is
3211 // but that is overkill as it doesn't matter. We must set the
3212 // stillborn flag for the first case, and if the thread has already
3213 // exited setting this flag has no affect
3214 java_lang_Thread::set_stillborn(java_thread);
3215 }
3216 JVM_END
3217
3218
3219 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3220 JVMWrapper("JVM_IsThreadAlive");
3221
3222 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3223 return java_lang_Thread::is_alive(thread_oop);
3224 JVM_END
3225
3226
3227 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3228 JVMWrapper("JVM_SuspendThread");
3229 oop java_thread = JNIHandles::resolve_non_null(jthread);
3230 JavaThread* receiver = java_lang_Thread::thread(java_thread);
3231
3232 if (receiver != NULL) {
3233 // thread has run and has not exited (still on threads list)
3234
3235 {
3236 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3237 if (receiver->is_external_suspend()) {
3238 // Don't allow nested external suspend requests. We can't return
3239 // an error from this interface so just ignore the problem.
3240 return;
3241 }
3242 if (receiver->is_exiting()) { // thread is in the process of exiting
3243 return;
3244 }
3245 receiver->set_external_suspend();
3246 }
3247
3248 // java_suspend() will catch threads in the process of exiting
3249 // and will ignore them.
3250 receiver->java_suspend();
3251
3252 // It would be nice to have the following assertion in all the
3253 // time, but it is possible for a racing resume request to have
3254 // resumed this thread right after we suspended it. Temporarily
3255 // enable this assertion if you are chasing a different kind of
3256 // bug.
3257 //
3258 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3259 // receiver->is_being_ext_suspended(), "thread is not suspended");
3260 }
3261 JVM_END
3262
3263
3264 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3265 JVMWrapper("JVM_ResumeThread");
3266 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
3267 // We need to *always* get the threads lock here, since this operation cannot be allowed during
3268 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3269 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3270 // looks at it.
3271 MutexLocker ml(Threads_lock);
3272 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3273 if (thr != NULL) {
3274 // the thread has run and is not in the process of exiting
3275 thr->java_resume();
3276 }
3277 JVM_END
3278
3279
3280 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3281 JVMWrapper("JVM_SetThreadPriority");
3282 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3283 MutexLocker ml(Threads_lock);
3284 oop java_thread = JNIHandles::resolve_non_null(jthread);
3285 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3286 JavaThread* thr = java_lang_Thread::thread(java_thread);
3287 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
3288 Thread::set_priority(thr, (ThreadPriority)prio);
3289 }
3290 JVM_END
3291
3292
3293 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3294 JVMWrapper("JVM_Yield");
3295 if (os::dont_yield()) return;
3296 #ifndef USDT2
3297 HS_DTRACE_PROBE0(hotspot, thread__yield);
3298 #else /* USDT2 */
3299 HOTSPOT_THREAD_YIELD();
3300 #endif /* USDT2 */
3301 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
3302 // Critical for similar threading behaviour
3303 if (ConvertYieldToSleep) {
3304 os::sleep(thread, MinSleepInterval, false);
3305 } else {
3306 os::yield();
3307 }
3308 JVM_END
3309
3310 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3311 assert(event != NULL, "invariant");
3312 assert(event->should_commit(), "invariant");
3313 event->set_time(millis);
3314 event->commit();
3315 }
3316
3317 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3318 JVMWrapper("JVM_Sleep");
3319
3320 if (millis < 0) {
3321 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3322 }
3323
3324 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3325 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3326 }
3327
3328 // Save current thread state and restore it at the end of this block.
3329 // And set new thread state to SLEEPING.
3330 JavaThreadSleepState jtss(thread);
3331
3332 #ifndef USDT2
3333 HS_DTRACE_PROBE1(hotspot, thread__sleep__begin, millis);
3334 #else /* USDT2 */
3335 HOTSPOT_THREAD_SLEEP_BEGIN(
3336 millis);
3337 #endif /* USDT2 */
3338
3339 EventThreadSleep event;
3340
3341 if (millis == 0) {
3342 // When ConvertSleepToYield is on, this matches the classic VM implementation of
3343 // JVM_Sleep. Critical for similar threading behaviour (Win32)
3344 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
3345 // for SOLARIS
3346 if (ConvertSleepToYield) {
3347 os::yield();
3348 } else {
3349 ThreadState old_state = thread->osthread()->get_state();
3350 thread->osthread()->set_state(SLEEPING);
3351 os::sleep(thread, MinSleepInterval, false);
3352 thread->osthread()->set_state(old_state);
3353 }
3354 } else {
3355 ThreadState old_state = thread->osthread()->get_state();
3356 thread->osthread()->set_state(SLEEPING);
3357 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3358 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3359 // us while we were sleeping. We do not overwrite those.
3360 if (!HAS_PENDING_EXCEPTION) {
3361 if (event.should_commit()) {
3362 post_thread_sleep_event(&event, millis);
3363 }
3364 #ifndef USDT2
3365 HS_DTRACE_PROBE1(hotspot, thread__sleep__end,1);
3366 #else /* USDT2 */
3367 HOTSPOT_THREAD_SLEEP_END(
3368 1);
3369 #endif /* USDT2 */
3370 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3371 // to properly restore the thread state. That's likely wrong.
3372 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3373 }
3374 }
3375 thread->osthread()->set_state(old_state);
3376 }
3377 if (event.should_commit()) {
3378 post_thread_sleep_event(&event, millis);
3379 }
3380 #ifndef USDT2
3381 HS_DTRACE_PROBE1(hotspot, thread__sleep__end,0);
3382 #else /* USDT2 */
3383 HOTSPOT_THREAD_SLEEP_END(
3384 0);
3385 #endif /* USDT2 */
3386 JVM_END
3387
3388 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3389 JVMWrapper("JVM_CurrentThread");
3390 oop jthread = thread->threadObj();
3391 assert (thread != NULL, "no current thread!");
3392 return JNIHandles::make_local(env, jthread);
3393 JVM_END
3394
3395
3396 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3397 JVMWrapper("JVM_CountStackFrames");
3398
3399 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3400 oop java_thread = JNIHandles::resolve_non_null(jthread);
3401 bool throw_illegal_thread_state = false;
3402 int count = 0;
3403
3404 {
3405 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3406 // We need to re-resolve the java_thread, since a GC might have happened during the
3407 // acquire of the lock
3408 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3409
3410 if (thr == NULL) {
3411 // do nothing
3412 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
3413 // Check whether this java thread has been suspended already. If not, throws
3414 // IllegalThreadStateException. We defer to throw that exception until
3415 // Threads_lock is released since loading exception class has to leave VM.
3416 // The correct way to test a thread is actually suspended is
3417 // wait_for_ext_suspend_completion(), but we can't call that while holding
3418 // the Threads_lock. The above tests are sufficient for our purposes
3419 // provided the walkability of the stack is stable - which it isn't
3420 // 100% but close enough for most practical purposes.
3421 throw_illegal_thread_state = true;
3422 } else {
3423 // Count all java activation, i.e., number of vframes
3424 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
3425 // Native frames are not counted
3426 if (!vfst.method()->is_native()) count++;
3427 }
3428 }
3429 }
3430
3431 if (throw_illegal_thread_state) {
3432 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3433 "this thread is not suspended");
3434 }
3435 return count;
3436 JVM_END
3437
3438 // Consider: A better way to implement JVM_Interrupt() is to acquire
3439 // Threads_lock to resolve the jthread into a Thread pointer, fetch
3440 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
3441 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
3442 // outside the critical section. Threads_lock is hot so we want to minimize
3443 // the hold-time. A cleaner interface would be to decompose interrupt into
3444 // two steps. The 1st phase, performed under Threads_lock, would return
3445 // a closure that'd be invoked after Threads_lock was dropped.
3446 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
3447 // admit spurious wakeups.
3448
3449 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3450 JVMWrapper("JVM_Interrupt");
3451
3452 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3453 oop java_thread = JNIHandles::resolve_non_null(jthread);
3454 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3455 // We need to re-resolve the java_thread, since a GC might have happened during the
3456 // acquire of the lock
3457 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3458 if (thr != NULL) {
3459 Thread::interrupt(thr);
3460 }
3461 JVM_END
3462
3463
3464 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3465 JVMWrapper("JVM_IsInterrupted");
3466
3467 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3468 oop java_thread = JNIHandles::resolve_non_null(jthread);
3469 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3470 // We need to re-resolve the java_thread, since a GC might have happened during the
3471 // acquire of the lock
3472 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3473 if (thr == NULL) {
3474 return JNI_FALSE;
3475 } else {
3476 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3477 }
3478 JVM_END
3479
3480
3481 // Return true iff the current thread has locked the object passed in
3482
3483 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3484 JVMWrapper("JVM_HoldsLock");
3485 assert(THREAD->is_Java_thread(), "sanity check");
3486 if (obj == NULL) {
3487 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3488 }
3489 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3490 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3491 JVM_END
3492
3493
3494 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3495 JVMWrapper("JVM_DumpAllStacks");
3496 VM_PrintThreads op;
3497 VMThread::execute(&op);
3498 if (JvmtiExport::should_post_data_dump()) {
3499 JvmtiExport::post_data_dump();
3500 }
3501 JVM_END
3502
3503 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3504 JVMWrapper("JVM_SetNativeThreadName");
3505 ResourceMark rm(THREAD);
3506 oop java_thread = JNIHandles::resolve_non_null(jthread);
3507 JavaThread* thr = java_lang_Thread::thread(java_thread);
3508 // Thread naming only supported for the current thread, doesn't work for
3509 // target threads.
3510 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3511 // we don't set the name of an attached thread to avoid stepping
3512 // on other programs
3513 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3514 os::set_native_thread_name(thread_name);
3515 }
3516 JVM_END
3517
3518 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3519
3520 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3521 assert(jthread->is_Java_thread(), "must be a Java thread");
3522 if (jthread->privileged_stack_top() == NULL) return false;
3523 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3524 oop loader = jthread->privileged_stack_top()->class_loader();
3525 if (loader == NULL) return true;
3526 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3527 if (trusted) return true;
3528 }
3529 return false;
3530 }
3531
3532 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3533 JVMWrapper("JVM_CurrentLoadedClass");
3534 ResourceMark rm(THREAD);
3535
3536 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3537 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3538 bool trusted = is_trusted_frame(thread, &vfst);
3539 if (trusted) return NULL;
3540
3541 Method* m = vfst.method();
3542 if (!m->is_native()) {
3543 InstanceKlass* holder = m->method_holder();
3544 oop loader = holder->class_loader();
3545 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3546 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3547 }
3548 }
3549 }
3550 return NULL;
3551 JVM_END
3552
3553
3554 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3555 JVMWrapper("JVM_CurrentClassLoader");
3556 ResourceMark rm(THREAD);
3557
3558 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3559
3560 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3561 bool trusted = is_trusted_frame(thread, &vfst);
3562 if (trusted) return NULL;
3563
3564 Method* m = vfst.method();
3565 if (!m->is_native()) {
3566 InstanceKlass* holder = m->method_holder();
3567 assert(holder->is_klass(), "just checking");
3568 oop loader = holder->class_loader();
3569 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3570 return JNIHandles::make_local(env, loader);
3571 }
3572 }
3573 }
3574 return NULL;
3575 JVM_END
3576
3577
3578 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3579 JVMWrapper("JVM_GetClassContext");
3580 ResourceMark rm(THREAD);
3581 JvmtiVMObjectAllocEventCollector oam;
3582 vframeStream vfst(thread);
3583
3584 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3585 // This must only be called from SecurityManager.getClassContext
3586 Method* m = vfst.method();
3587 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3588 m->name() == vmSymbols::getClassContext_name() &&
3589 m->signature() == vmSymbols::void_class_array_signature())) {
3590 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3591 }
3592 }
3593
3594 // Collect method holders
3595 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3596 for (; !vfst.at_end(); vfst.security_next()) {
3597 Method* m = vfst.method();
3598 // Native frames are not returned
3599 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3600 Klass* holder = m->method_holder();
3601 assert(holder->is_klass(), "just checking");
3602 klass_array->append(holder);
3603 }
3604 }
3605
3606 // Create result array of type [Ljava/lang/Class;
3607 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3608 // Fill in mirrors corresponding to method holders
3609 for (int i = 0; i < klass_array->length(); i++) {
3610 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3611 }
3612
3613 return (jobjectArray) JNIHandles::make_local(env, result);
3614 JVM_END
3615
3616
3617 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3618 JVMWrapper("JVM_ClassDepth");
3619 ResourceMark rm(THREAD);
3620 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3621 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3622
3623 const char* str = java_lang_String::as_utf8_string(class_name_str());
3624 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3625 if (class_name_sym == NULL) {
3626 return -1;
3627 }
3628
3629 int depth = 0;
3630
3631 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3632 if (!vfst.method()->is_native()) {
3633 InstanceKlass* holder = vfst.method()->method_holder();
3634 assert(holder->is_klass(), "just checking");
3635 if (holder->name() == class_name_sym) {
3636 return depth;
3637 }
3638 depth++;
3639 }
3640 }
3641 return -1;
3642 JVM_END
3643
3644
3645 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3646 JVMWrapper("JVM_ClassLoaderDepth");
3647 ResourceMark rm(THREAD);
3648 int depth = 0;
3649 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3650 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3651 bool trusted = is_trusted_frame(thread, &vfst);
3652 if (trusted) return -1;
3653
3654 Method* m = vfst.method();
3655 if (!m->is_native()) {
3656 InstanceKlass* holder = m->method_holder();
3657 assert(holder->is_klass(), "just checking");
3658 oop loader = holder->class_loader();
3659 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3660 return depth;
3661 }
3662 depth++;
3663 }
3664 }
3665 return -1;
3666 JVM_END
3667
3668
3669 // java.lang.Package ////////////////////////////////////////////////////////////////
3670
3671
3672 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3673 JVMWrapper("JVM_GetSystemPackage");
3674 ResourceMark rm(THREAD);
3675 JvmtiVMObjectAllocEventCollector oam;
3676 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3677 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3678 return (jstring) JNIHandles::make_local(result);
3679 JVM_END
3680
3681
3682 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3683 JVMWrapper("JVM_GetSystemPackages");
3684 JvmtiVMObjectAllocEventCollector oam;
3685 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3686 return (jobjectArray) JNIHandles::make_local(result);
3687 JVM_END
3688
3689
3690 // ObjectInputStream ///////////////////////////////////////////////////////////////
3691
3692 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3693 if (current_class == NULL) {
3694 return true;
3695 }
3696 if ((current_class == field_class) || access.is_public()) {
3697 return true;
3698 }
3699
3700 if (access.is_protected()) {
3701 // See if current_class is a subclass of field_class
3702 if (current_class->is_subclass_of(field_class)) {
3703 return true;
3704 }
3705 }
3706
3707 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3708 }
3709
3710
3711 // JVM_AllocateNewObject and JVM_AllocateNewArray are unused as of 1.4
3712 JVM_ENTRY(jobject, JVM_AllocateNewObject(JNIEnv *env, jobject receiver, jclass currClass, jclass initClass))
3713 JVMWrapper("JVM_AllocateNewObject");
3714 JvmtiVMObjectAllocEventCollector oam;
3715 // Receiver is not used
3716 oop curr_mirror = JNIHandles::resolve_non_null(currClass);
3717 oop init_mirror = JNIHandles::resolve_non_null(initClass);
3718
3719 // Cannot instantiate primitive types
3720 if (java_lang_Class::is_primitive(curr_mirror) || java_lang_Class::is_primitive(init_mirror)) {
3721 ResourceMark rm(THREAD);
3722 THROW_0(vmSymbols::java_lang_InvalidClassException());
3723 }
3724
3725 // Arrays not allowed here, must use JVM_AllocateNewArray
3726 if (java_lang_Class::as_Klass(curr_mirror)->oop_is_array() ||
3727 java_lang_Class::as_Klass(init_mirror)->oop_is_array()) {
3728 ResourceMark rm(THREAD);
3729 THROW_0(vmSymbols::java_lang_InvalidClassException());
3730 }
3731
3732 instanceKlassHandle curr_klass (THREAD, java_lang_Class::as_Klass(curr_mirror));
3733 instanceKlassHandle init_klass (THREAD, java_lang_Class::as_Klass(init_mirror));
3734
3735 assert(curr_klass->is_subclass_of(init_klass()), "just checking");
3736
3737 // Interfaces, abstract classes, and java.lang.Class classes cannot be instantiated directly.
3738 curr_klass->check_valid_for_instantiation(false, CHECK_NULL);
3739
3740 // Make sure klass is initialized, since we are about to instantiate one of them.
3741 curr_klass->initialize(CHECK_NULL);
3742
3743 methodHandle m (THREAD,
3744 init_klass->find_method(vmSymbols::object_initializer_name(),
3745 vmSymbols::void_method_signature()));
3746 if (m.is_null()) {
3747 ResourceMark rm(THREAD);
3748 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(),
3749 Method::name_and_sig_as_C_string(init_klass(),
3750 vmSymbols::object_initializer_name(),
3751 vmSymbols::void_method_signature()));
3752 }
3753
3754 if (curr_klass == init_klass && !m->is_public()) {
3755 // Calling the constructor for class 'curr_klass'.
3756 // Only allow calls to a public no-arg constructor.
3757 // This path corresponds to creating an Externalizable object.
3758 THROW_0(vmSymbols::java_lang_IllegalAccessException());
3759 }
3760
3761 if (!force_verify_field_access(curr_klass(), init_klass(), m->access_flags(), false)) {
3762 // subclass 'curr_klass' does not have access to no-arg constructor of 'initcb'
3763 THROW_0(vmSymbols::java_lang_IllegalAccessException());
3764 }
3765
3766 Handle obj = curr_klass->allocate_instance_handle(CHECK_NULL);
3767 // Call constructor m. This might call a constructor higher up in the hierachy
3768 JavaCalls::call_default_constructor(thread, m, obj, CHECK_NULL);
3769
3770 return JNIHandles::make_local(obj());
3771 JVM_END
3772
3773
3774 JVM_ENTRY(jobject, JVM_AllocateNewArray(JNIEnv *env, jobject obj, jclass currClass, jint length))
3775 JVMWrapper("JVM_AllocateNewArray");
3776 JvmtiVMObjectAllocEventCollector oam;
3777 oop mirror = JNIHandles::resolve_non_null(currClass);
3778
3779 if (java_lang_Class::is_primitive(mirror)) {
3780 THROW_0(vmSymbols::java_lang_InvalidClassException());
3781 }
3782 Klass* k = java_lang_Class::as_Klass(mirror);
3783 oop result;
3784
3785 if (k->oop_is_typeArray()) {
3786 // typeArray
3787 result = TypeArrayKlass::cast(k)->allocate(length, CHECK_NULL);
3788 } else if (k->oop_is_objArray()) {
3789 // objArray
3790 ObjArrayKlass* oak = ObjArrayKlass::cast(k);
3791 oak->initialize(CHECK_NULL); // make sure class is initialized (matches Classic VM behavior)
3792 result = oak->allocate(length, CHECK_NULL);
3793 } else {
3794 THROW_0(vmSymbols::java_lang_InvalidClassException());
3795 }
3796 return JNIHandles::make_local(env, result);
3797 JVM_END
3798
3799
3800 // Returns first non-privileged class loader on the stack (excluding reflection
3801 // generated frames) or null if only classes loaded by the boot class loader
3802 // and extension class loader are found on the stack.
3803
3804 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3805 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3806 // UseNewReflection
3807 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3808 oop loader = vfst.method()->method_holder()->class_loader();
3809 if (loader != NULL && !SystemDictionary::is_ext_class_loader(loader)) {
3810 return JNIHandles::make_local(env, loader);
3811 }
3812 }
3813 return NULL;
3814 JVM_END
3815
3816
3817 // Load a class relative to the most recent class on the stack with a non-null
3818 // classloader.
3819 // This function has been deprecated and should not be considered part of the
3820 // specified JVM interface.
3821
3822 JVM_ENTRY(jclass, JVM_LoadClass0(JNIEnv *env, jobject receiver,
3823 jclass currClass, jstring currClassName))
3824 JVMWrapper("JVM_LoadClass0");
3825 // Receiver is not used
3826 ResourceMark rm(THREAD);
3827
3828 // Class name argument is not guaranteed to be in internal format
3829 Handle classname (THREAD, JNIHandles::resolve_non_null(currClassName));
3830 Handle string = java_lang_String::internalize_classname(classname, CHECK_NULL);
3831
3832 const char* str = java_lang_String::as_utf8_string(string());
3833
3834 if (str == NULL || (int)strlen(str) > Symbol::max_length()) {
3835 // It's impossible to create this class; the name cannot fit
3836 // into the constant pool.
3837 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), str);
3838 }
3839
3840 TempNewSymbol name = SymbolTable::new_symbol(str, CHECK_NULL);
3841 Handle curr_klass (THREAD, JNIHandles::resolve(currClass));
3842 // Find the most recent class on the stack with a non-null classloader
3843 oop loader = NULL;
3844 oop protection_domain = NULL;
3845 if (curr_klass.is_null()) {
3846 for (vframeStream vfst(thread);
3847 !vfst.at_end() && loader == NULL;
3848 vfst.next()) {
3849 if (!vfst.method()->is_native()) {
3850 InstanceKlass* holder = vfst.method()->method_holder();
3851 loader = holder->class_loader();
3852 protection_domain = holder->protection_domain();
3853 }
3854 }
3855 } else {
3856 Klass* curr_klass_oop = java_lang_Class::as_Klass(curr_klass());
3857 loader = InstanceKlass::cast(curr_klass_oop)->class_loader();
3858 protection_domain = InstanceKlass::cast(curr_klass_oop)->protection_domain();
3859 }
3860 Handle h_loader(THREAD, loader);
3861 Handle h_prot (THREAD, protection_domain);
3862 jclass result = find_class_from_class_loader(env, name, true, h_loader, h_prot,
3863 false, thread);
3864 if (TraceClassResolution && result != NULL) {
3865 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
3866 }
3867 return result;
3868 JVM_END
3869
3870
3871 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3872
3873
3874 // resolve array handle and check arguments
3875 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3876 if (arr == NULL) {
3877 THROW_0(vmSymbols::java_lang_NullPointerException());
3878 }
3879 oop a = JNIHandles::resolve_non_null(arr);
3880 if (!a->is_array() || (type_array_only && !a->is_typeArray())) {
3881 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3882 }
3883 return arrayOop(a);
3884 }
3885
3886
3887 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3888 JVMWrapper("JVM_GetArrayLength");
3889 arrayOop a = check_array(env, arr, false, CHECK_0);
3890 return a->length();
3891 JVM_END
3892
3893
3894 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3895 JVMWrapper("JVM_Array_Get");
3896 JvmtiVMObjectAllocEventCollector oam;
3897 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3898 jvalue value;
3899 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3900 oop box = Reflection::box(&value, type, CHECK_NULL);
3901 return JNIHandles::make_local(env, box);
3902 JVM_END
3903
3904
3905 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3906 JVMWrapper("JVM_GetPrimitiveArrayElement");
3907 jvalue value;
3908 value.i = 0; // to initialize value before getting used in CHECK
3909 arrayOop a = check_array(env, arr, true, CHECK_(value));
3910 assert(a->is_typeArray(), "just checking");
3911 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3912 BasicType wide_type = (BasicType) wCode;
3913 if (type != wide_type) {
3914 Reflection::widen(&value, type, wide_type, CHECK_(value));
3915 }
3916 return value;
3917 JVM_END
3918
3919
3920 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3921 JVMWrapper("JVM_SetArrayElement");
3922 arrayOop a = check_array(env, arr, false, CHECK);
3923 oop box = JNIHandles::resolve(val);
3924 jvalue value;
3925 value.i = 0; // to initialize value before getting used in CHECK
3926 BasicType value_type;
3927 if (a->is_objArray()) {
3928 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3929 value_type = Reflection::unbox_for_regular_object(box, &value);
3930 } else {
3931 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3932 }
3933 Reflection::array_set(&value, a, index, value_type, CHECK);
3934 JVM_END
3935
3936
3937 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3938 JVMWrapper("JVM_SetPrimitiveArrayElement");
3939 arrayOop a = check_array(env, arr, true, CHECK);
3940 assert(a->is_typeArray(), "just checking");
3941 BasicType value_type = (BasicType) vCode;
3942 Reflection::array_set(&v, a, index, value_type, CHECK);
3943 JVM_END
3944
3945
3946 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3947 JVMWrapper("JVM_NewArray");
3948 JvmtiVMObjectAllocEventCollector oam;
3949 oop element_mirror = JNIHandles::resolve(eltClass);
3950 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3951 return JNIHandles::make_local(env, result);
3952 JVM_END
3953
3954
3955 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3956 JVMWrapper("JVM_NewMultiArray");
3957 JvmtiVMObjectAllocEventCollector oam;
3958 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3959 oop element_mirror = JNIHandles::resolve(eltClass);
3960 assert(dim_array->is_typeArray(), "just checking");
3961 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3962 return JNIHandles::make_local(env, result);
3963 JVM_END
3964
3965
3966 // Networking library support ////////////////////////////////////////////////////////////////////
3967
3968 JVM_LEAF(jint, JVM_InitializeSocketLibrary())
3969 JVMWrapper("JVM_InitializeSocketLibrary");
3970 return 0;
3971 JVM_END
3972
3973
3974 JVM_LEAF(jint, JVM_Socket(jint domain, jint type, jint protocol))
3975 JVMWrapper("JVM_Socket");
3976 return os::socket(domain, type, protocol);
3977 JVM_END
3978
3979
3980 JVM_LEAF(jint, JVM_SocketClose(jint fd))
3981 JVMWrapper2("JVM_SocketClose (0x%x)", fd);
3982 //%note jvm_r6
3983 return os::socket_close(fd);
3984 JVM_END
3985
3986
3987 JVM_LEAF(jint, JVM_SocketShutdown(jint fd, jint howto))
3988 JVMWrapper2("JVM_SocketShutdown (0x%x)", fd);
3989 //%note jvm_r6
3990 return os::socket_shutdown(fd, howto);
3991 JVM_END
3992
3993
3994 JVM_LEAF(jint, JVM_Recv(jint fd, char *buf, jint nBytes, jint flags))
3995 JVMWrapper2("JVM_Recv (0x%x)", fd);
3996 //%note jvm_r6
3997 return os::recv(fd, buf, (size_t)nBytes, (uint)flags);
3998 JVM_END
3999
4000
4001 JVM_LEAF(jint, JVM_Send(jint fd, char *buf, jint nBytes, jint flags))
4002 JVMWrapper2("JVM_Send (0x%x)", fd);
4003 //%note jvm_r6
4004 return os::send(fd, buf, (size_t)nBytes, (uint)flags);
4005 JVM_END
4006
4007
4008 JVM_LEAF(jint, JVM_Timeout(int fd, long timeout))
4009 JVMWrapper2("JVM_Timeout (0x%x)", fd);
4010 //%note jvm_r6
4011 return os::timeout(fd, timeout);
4012 JVM_END
4013
4014
4015 JVM_LEAF(jint, JVM_Listen(jint fd, jint count))
4016 JVMWrapper2("JVM_Listen (0x%x)", fd);
4017 //%note jvm_r6
4018 return os::listen(fd, count);
4019 JVM_END
4020
4021
4022 JVM_LEAF(jint, JVM_Connect(jint fd, struct sockaddr *him, jint len))
4023 JVMWrapper2("JVM_Connect (0x%x)", fd);
4024 //%note jvm_r6
4025 return os::connect(fd, him, (socklen_t)len);
4026 JVM_END
4027
4028
4029 JVM_LEAF(jint, JVM_Bind(jint fd, struct sockaddr *him, jint len))
4030 JVMWrapper2("JVM_Bind (0x%x)", fd);
4031 //%note jvm_r6
4032 return os::bind(fd, him, (socklen_t)len);
4033 JVM_END
4034
4035
4036 JVM_LEAF(jint, JVM_Accept(jint fd, struct sockaddr *him, jint *len))
4037 JVMWrapper2("JVM_Accept (0x%x)", fd);
4038 //%note jvm_r6
4039 socklen_t socklen = (socklen_t)(*len);
4040 jint result = os::accept(fd, him, &socklen);
4041 *len = (jint)socklen;
4042 return result;
4043 JVM_END
4044
4045
4046 JVM_LEAF(jint, JVM_RecvFrom(jint fd, char *buf, int nBytes, int flags, struct sockaddr *from, int *fromlen))
4047 JVMWrapper2("JVM_RecvFrom (0x%x)", fd);
4048 //%note jvm_r6
4049 socklen_t socklen = (socklen_t)(*fromlen);
4050 jint result = os::recvfrom(fd, buf, (size_t)nBytes, (uint)flags, from, &socklen);
4051 *fromlen = (int)socklen;
4052 return result;
4053 JVM_END
4054
4055
4056 JVM_LEAF(jint, JVM_GetSockName(jint fd, struct sockaddr *him, int *len))
4057 JVMWrapper2("JVM_GetSockName (0x%x)", fd);
4058 //%note jvm_r6
4059 socklen_t socklen = (socklen_t)(*len);
4060 jint result = os::get_sock_name(fd, him, &socklen);
4061 *len = (int)socklen;
4062 return result;
4063 JVM_END
4064
4065
4066 JVM_LEAF(jint, JVM_SendTo(jint fd, char *buf, int len, int flags, struct sockaddr *to, int tolen))
4067 JVMWrapper2("JVM_SendTo (0x%x)", fd);
4068 //%note jvm_r6
4069 return os::sendto(fd, buf, (size_t)len, (uint)flags, to, (socklen_t)tolen);
4070 JVM_END
4071
4072
4073 JVM_LEAF(jint, JVM_SocketAvailable(jint fd, jint *pbytes))
4074 JVMWrapper2("JVM_SocketAvailable (0x%x)", fd);
4075 //%note jvm_r6
4076 return os::socket_available(fd, pbytes);
4077 JVM_END
4078
4079
4080 JVM_LEAF(jint, JVM_GetSockOpt(jint fd, int level, int optname, char *optval, int *optlen))
4081 JVMWrapper2("JVM_GetSockOpt (0x%x)", fd);
4082 //%note jvm_r6
4083 socklen_t socklen = (socklen_t)(*optlen);
4084 jint result = os::get_sock_opt(fd, level, optname, optval, &socklen);
4085 *optlen = (int)socklen;
4086 return result;
4087 JVM_END
4088
4089
4090 JVM_LEAF(jint, JVM_SetSockOpt(jint fd, int level, int optname, const char *optval, int optlen))
4091 JVMWrapper2("JVM_GetSockOpt (0x%x)", fd);
4092 //%note jvm_r6
4093 return os::set_sock_opt(fd, level, optname, optval, (socklen_t)optlen);
4094 JVM_END
4095
4096
4097 JVM_LEAF(int, JVM_GetHostName(char* name, int namelen))
4098 JVMWrapper("JVM_GetHostName");
4099 return os::get_host_name(name, namelen);
4100 JVM_END
4101
4102
4103 // Library support ///////////////////////////////////////////////////////////////////////////
4104
4105 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
4106 //%note jvm_ct
4107 JVMWrapper2("JVM_LoadLibrary (%s)", name);
4108 char ebuf[1024];
4109 void *load_result;
4110 {
4111 ThreadToNativeFromVM ttnfvm(thread);
4112 load_result = os::dll_load(name, ebuf, sizeof ebuf);
4113 }
4114 if (load_result == NULL) {
4115 char msg[1024];
4116 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
4117 // Since 'ebuf' may contain a string encoded using
4118 // platform encoding scheme, we need to pass
4119 // Exceptions::unsafe_to_utf8 to the new_exception method
4120 // as the last argument. See bug 6367357.
4121 Handle h_exception =
4122 Exceptions::new_exception(thread,
4123 vmSymbols::java_lang_UnsatisfiedLinkError(),
4124 msg, Exceptions::unsafe_to_utf8);
4125
4126 THROW_HANDLE_0(h_exception);
4127 }
4128 return load_result;
4129 JVM_END
4130
4131
4132 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
4133 JVMWrapper("JVM_UnloadLibrary");
4134 os::dll_unload(handle);
4135 JVM_END
4136
4137
4138 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
4139 JVMWrapper2("JVM_FindLibraryEntry (%s)", name);
4140 return os::dll_lookup(handle, name);
4141 JVM_END
4142
4143
4144 // Floating point support ////////////////////////////////////////////////////////////////////
4145
4146 JVM_LEAF(jboolean, JVM_IsNaN(jdouble a))
4147 JVMWrapper("JVM_IsNaN");
4148 return g_isnan(a);
4149 JVM_END
4150
4151
4152 // JNI version ///////////////////////////////////////////////////////////////////////////////
4153
4154 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
4155 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version);
4156 return Threads::is_supported_jni_version_including_1_1(version);
4157 JVM_END
4158
4159
4160 // String support ///////////////////////////////////////////////////////////////////////////
4161
4162 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
4163 JVMWrapper("JVM_InternString");
4164 JvmtiVMObjectAllocEventCollector oam;
4165 if (str == NULL) return NULL;
4166 oop string = JNIHandles::resolve_non_null(str);
4167 oop result = StringTable::intern(string, CHECK_NULL);
4168 return (jstring) JNIHandles::make_local(env, result);
4169 JVM_END
4170
4171
4172 // Raw monitor support //////////////////////////////////////////////////////////////////////
4173
4174 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
4175 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
4176 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
4177 // that only works with java threads.
4178
4179
4180 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
4181 VM_Exit::block_if_vm_exited();
4182 JVMWrapper("JVM_RawMonitorCreate");
4183 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
4184 }
4185
4186
4187 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
4188 VM_Exit::block_if_vm_exited();
4189 JVMWrapper("JVM_RawMonitorDestroy");
4190 delete ((Mutex*) mon);
4191 }
4192
4193
4194 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
4195 VM_Exit::block_if_vm_exited();
4196 JVMWrapper("JVM_RawMonitorEnter");
4197 ((Mutex*) mon)->jvm_raw_lock();
4198 return 0;
4199 }
4200
4201
4202 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
4203 VM_Exit::block_if_vm_exited();
4204 JVMWrapper("JVM_RawMonitorExit");
4205 ((Mutex*) mon)->jvm_raw_unlock();
4206 }
4207
4208
4209 // Support for Serialization
4210
4211 typedef jfloat (JNICALL *IntBitsToFloatFn )(JNIEnv* env, jclass cb, jint value);
4212 typedef jdouble (JNICALL *LongBitsToDoubleFn)(JNIEnv* env, jclass cb, jlong value);
4213 typedef jint (JNICALL *FloatToIntBitsFn )(JNIEnv* env, jclass cb, jfloat value);
4214 typedef jlong (JNICALL *DoubleToLongBitsFn)(JNIEnv* env, jclass cb, jdouble value);
4215
4216 static IntBitsToFloatFn int_bits_to_float_fn = NULL;
4217 static LongBitsToDoubleFn long_bits_to_double_fn = NULL;
4218 static FloatToIntBitsFn float_to_int_bits_fn = NULL;
4219 static DoubleToLongBitsFn double_to_long_bits_fn = NULL;
4220
4221
4222 void initialize_converter_functions() {
4223 if (JDK_Version::is_gte_jdk14x_version()) {
4224 // These functions only exist for compatibility with 1.3.1 and earlier
4225 return;
4226 }
4227
4228 // called from universe_post_init()
4229 assert(
4230 int_bits_to_float_fn == NULL &&
4231 long_bits_to_double_fn == NULL &&
4232 float_to_int_bits_fn == NULL &&
4233 double_to_long_bits_fn == NULL ,
4234 "initialization done twice"
4235 );
4236 // initialize
4237 int_bits_to_float_fn = CAST_TO_FN_PTR(IntBitsToFloatFn , NativeLookup::base_library_lookup("java/lang/Float" , "intBitsToFloat" , "(I)F"));
4238 long_bits_to_double_fn = CAST_TO_FN_PTR(LongBitsToDoubleFn, NativeLookup::base_library_lookup("java/lang/Double", "longBitsToDouble", "(J)D"));
4239 float_to_int_bits_fn = CAST_TO_FN_PTR(FloatToIntBitsFn , NativeLookup::base_library_lookup("java/lang/Float" , "floatToIntBits" , "(F)I"));
4240 double_to_long_bits_fn = CAST_TO_FN_PTR(DoubleToLongBitsFn, NativeLookup::base_library_lookup("java/lang/Double", "doubleToLongBits", "(D)J"));
4241 // verify
4242 assert(
4243 int_bits_to_float_fn != NULL &&
4244 long_bits_to_double_fn != NULL &&
4245 float_to_int_bits_fn != NULL &&
4246 double_to_long_bits_fn != NULL ,
4247 "initialization failed"
4248 );
4249 }
4250
4251
4252
4253 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
4254
4255 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
4256 Handle loader, Handle protection_domain,
4257 jboolean throwError, TRAPS) {
4258 // Security Note:
4259 // The Java level wrapper will perform the necessary security check allowing
4260 // us to pass the NULL as the initiating class loader. The VM is responsible for
4261 // the checkPackageAccess relative to the initiating class loader via the
4262 // protection_domain. The protection_domain is passed as NULL by the java code
4263 // if there is no security manager in 3-arg Class.forName().
4264 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
4265
4266 KlassHandle klass_handle(THREAD, klass);
4267 // Check if we should initialize the class
4268 if (init && klass_handle->oop_is_instance()) {
4269 klass_handle->initialize(CHECK_NULL);
4270 }
4271 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
4272 }
4273
4274
4275 // Internal SQE debugging support ///////////////////////////////////////////////////////////
4276
4277 #ifndef PRODUCT
4278
4279 extern "C" {
4280 JNIEXPORT jboolean JNICALL JVM_AccessVMBooleanFlag(const char* name, jboolean* value, jboolean is_get);
4281 JNIEXPORT jboolean JNICALL JVM_AccessVMIntFlag(const char* name, jint* value, jboolean is_get);
4282 JNIEXPORT void JNICALL JVM_VMBreakPoint(JNIEnv *env, jobject obj);
4283 }
4284
4285 JVM_LEAF(jboolean, JVM_AccessVMBooleanFlag(const char* name, jboolean* value, jboolean is_get))
4286 JVMWrapper("JVM_AccessBoolVMFlag");
4287 return is_get ? CommandLineFlags::boolAt((char*) name, (bool*) value) : CommandLineFlags::boolAtPut((char*) name, (bool*) value, Flag::INTERNAL);
4288 JVM_END
4289
4290 JVM_LEAF(jboolean, JVM_AccessVMIntFlag(const char* name, jint* value, jboolean is_get))
4291 JVMWrapper("JVM_AccessVMIntFlag");
4292 intx v;
4293 jboolean result = is_get ? CommandLineFlags::intxAt((char*) name, &v) : CommandLineFlags::intxAtPut((char*) name, &v, Flag::INTERNAL);
4294 *value = (jint)v;
4295 return result;
4296 JVM_END
4297
4298
4299 JVM_ENTRY(void, JVM_VMBreakPoint(JNIEnv *env, jobject obj))
4300 JVMWrapper("JVM_VMBreakPoint");
4301 oop the_obj = JNIHandles::resolve(obj);
4302 BREAKPOINT;
4303 JVM_END
4304
4305
4306 #endif
4307
4308
4309 // Method ///////////////////////////////////////////////////////////////////////////////////////////
4310
4311 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
4312 JVMWrapper("JVM_InvokeMethod");
4313 Handle method_handle;
4314 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
4315 method_handle = Handle(THREAD, JNIHandles::resolve(method));
4316 Handle receiver(THREAD, JNIHandles::resolve(obj));
4317 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
4318 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
4319 jobject res = JNIHandles::make_local(env, result);
4320 if (JvmtiExport::should_post_vm_object_alloc()) {
4321 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
4322 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
4323 if (java_lang_Class::is_primitive(ret_type)) {
4324 // Only for primitive type vm allocates memory for java object.
4325 // See box() method.
4326 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
4327 }
4328 }
4329 return res;
4330 } else {
4331 THROW_0(vmSymbols::java_lang_StackOverflowError());
4332 }
4333 JVM_END
4334
4335
4336 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
4337 JVMWrapper("JVM_NewInstanceFromConstructor");
4338 oop constructor_mirror = JNIHandles::resolve(c);
4339 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
4340 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
4341 jobject res = JNIHandles::make_local(env, result);
4342 if (JvmtiExport::should_post_vm_object_alloc()) {
4343 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
4344 }
4345 return res;
4346 JVM_END
4347
4348 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
4349
4350 JVM_LEAF(jboolean, JVM_SupportsCX8())
4351 JVMWrapper("JVM_SupportsCX8");
4352 return VM_Version::supports_cx8();
4353 JVM_END
4354
4355
4356 JVM_ENTRY(jboolean, JVM_CX8Field(JNIEnv *env, jobject obj, jfieldID fid, jlong oldVal, jlong newVal))
4357 JVMWrapper("JVM_CX8Field");
4358 jlong res;
4359 oop o = JNIHandles::resolve(obj);
4360 intptr_t fldOffs = jfieldIDWorkaround::from_instance_jfieldID(o->klass(), fid);
4361 volatile jlong* addr = (volatile jlong*)((address)o + fldOffs);
4362
4363 assert(VM_Version::supports_cx8(), "cx8 not supported");
4364 res = Atomic::cmpxchg(newVal, addr, oldVal);
4365
4366 return res == oldVal;
4367 JVM_END
4368
4369 // DTrace ///////////////////////////////////////////////////////////////////
4370
4371 JVM_ENTRY(jint, JVM_DTraceGetVersion(JNIEnv* env))
4372 JVMWrapper("JVM_DTraceGetVersion");
4373 return (jint)JVM_TRACING_DTRACE_VERSION;
4374 JVM_END
4375
4376 JVM_ENTRY(jlong,JVM_DTraceActivate(
4377 JNIEnv* env, jint version, jstring module_name, jint providers_count,
4378 JVM_DTraceProvider* providers))
4379 JVMWrapper("JVM_DTraceActivate");
4380 return DTraceJSDT::activate(
4381 version, module_name, providers_count, providers, THREAD);
4382 JVM_END
4383
4384 JVM_ENTRY(jboolean,JVM_DTraceIsProbeEnabled(JNIEnv* env, jmethodID method))
4385 JVMWrapper("JVM_DTraceIsProbeEnabled");
4386 return DTraceJSDT::is_probe_enabled(method);
4387 JVM_END
4388
4389 JVM_ENTRY(void,JVM_DTraceDispose(JNIEnv* env, jlong handle))
4390 JVMWrapper("JVM_DTraceDispose");
4391 DTraceJSDT::dispose(handle);
4392 JVM_END
4393
4394 JVM_ENTRY(jboolean,JVM_DTraceIsSupported(JNIEnv* env))
4395 JVMWrapper("JVM_DTraceIsSupported");
4396 return DTraceJSDT::is_supported();
4397 JVM_END
4398
4399 // Returns an array of all live Thread objects (VM internal JavaThreads,
4400 // jvmti agent threads, and JNI attaching threads are skipped)
4401 // See CR 6404306 regarding JNI attaching threads
4402 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
4403 ResourceMark rm(THREAD);
4404 ThreadsListEnumerator tle(THREAD, false, false);
4405 JvmtiVMObjectAllocEventCollector oam;
4406
4407 int num_threads = tle.num_threads();
4408 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
4409 objArrayHandle threads_ah(THREAD, r);
4410
4411 for (int i = 0; i < num_threads; i++) {
4412 Handle h = tle.get_threadObj(i);
4413 threads_ah->obj_at_put(i, h());
4414 }
4415
4416 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
4417 JVM_END
4418
4419
4420 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
4421 // Return StackTraceElement[][], each element is the stack trace of a thread in
4422 // the corresponding entry in the given threads array
4423 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
4424 JVMWrapper("JVM_DumpThreads");
4425 JvmtiVMObjectAllocEventCollector oam;
4426
4427 // Check if threads is null
4428 if (threads == NULL) {
4429 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
4430 }
4431
4432 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
4433 objArrayHandle ah(THREAD, a);
4434 int num_threads = ah->length();
4435 // check if threads is non-empty array
4436 if (num_threads == 0) {
4437 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
4438 }
4439
4440 // check if threads is not an array of objects of Thread class
4441 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
4442 if (k != SystemDictionary::Thread_klass()) {
4443 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
4444 }
4445
4446 ResourceMark rm(THREAD);
4447
4448 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
4449 for (int i = 0; i < num_threads; i++) {
4450 oop thread_obj = ah->obj_at(i);
4451 instanceHandle h(THREAD, (instanceOop) thread_obj);
4452 thread_handle_array->append(h);
4453 }
4454
4455 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
4456 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
4457
4458 JVM_END
4459
4460 // JVM monitoring and management support
4461 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
4462 return Management::get_jmm_interface(version);
4463 JVM_END
4464
4465 // com.sun.tools.attach.VirtualMachine agent properties support
4466 //
4467 // Initialize the agent properties with the properties maintained in the VM
4468 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
4469 JVMWrapper("JVM_InitAgentProperties");
4470 ResourceMark rm;
4471
4472 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
4473
4474 PUTPROP(props, "sun.java.command", Arguments::java_command());
4475 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
4476 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
4477 return properties;
4478 JVM_END
4479
4480 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
4481 {
4482 JVMWrapper("JVM_GetEnclosingMethodInfo");
4483 JvmtiVMObjectAllocEventCollector oam;
4484
4485 if (ofClass == NULL) {
4486 return NULL;
4487 }
4488 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
4489 // Special handling for primitive objects
4490 if (java_lang_Class::is_primitive(mirror())) {
4491 return NULL;
4492 }
4493 Klass* k = java_lang_Class::as_Klass(mirror());
4494 if (!k->oop_is_instance()) {
4495 return NULL;
4496 }
4497 instanceKlassHandle ik_h(THREAD, k);
4498 int encl_method_class_idx = ik_h->enclosing_method_class_index();
4499 if (encl_method_class_idx == 0) {
4500 return NULL;
4501 }
4502 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
4503 objArrayHandle dest(THREAD, dest_o);
4504 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
4505 dest->obj_at_put(0, enc_k->java_mirror());
4506 int encl_method_method_idx = ik_h->enclosing_method_method_index();
4507 if (encl_method_method_idx != 0) {
4508 Symbol* sym = ik_h->constants()->symbol_at(
4509 extract_low_short_from_int(
4510 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
4511 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
4512 dest->obj_at_put(1, str());
4513 sym = ik_h->constants()->symbol_at(
4514 extract_high_short_from_int(
4515 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
4516 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
4517 dest->obj_at_put(2, str());
4518 }
4519 return (jobjectArray) JNIHandles::make_local(dest());
4520 }
4521 JVM_END
4522
4523 JVM_ENTRY(jintArray, JVM_GetThreadStateValues(JNIEnv* env,
4524 jint javaThreadState))
4525 {
4526 // If new thread states are added in future JDK and VM versions,
4527 // this should check if the JDK version is compatible with thread
4528 // states supported by the VM. Return NULL if not compatible.
4529 //
4530 // This function must map the VM java_lang_Thread::ThreadStatus
4531 // to the Java thread state that the JDK supports.
4532 //
4533
4534 typeArrayHandle values_h;
4535 switch (javaThreadState) {
4536 case JAVA_THREAD_STATE_NEW : {
4537 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL);
4538 values_h = typeArrayHandle(THREAD, r);
4539 values_h->int_at_put(0, java_lang_Thread::NEW);
4540 break;
4541 }
4542 case JAVA_THREAD_STATE_RUNNABLE : {
4543 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL);
4544 values_h = typeArrayHandle(THREAD, r);
4545 values_h->int_at_put(0, java_lang_Thread::RUNNABLE);
4546 break;
4547 }
4548 case JAVA_THREAD_STATE_BLOCKED : {
4549 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL);
4550 values_h = typeArrayHandle(THREAD, r);
4551 values_h->int_at_put(0, java_lang_Thread::BLOCKED_ON_MONITOR_ENTER);
4552 break;
4553 }
4554 case JAVA_THREAD_STATE_WAITING : {
4555 typeArrayOop r = oopFactory::new_typeArray(T_INT, 2, CHECK_NULL);
4556 values_h = typeArrayHandle(THREAD, r);
4557 values_h->int_at_put(0, java_lang_Thread::IN_OBJECT_WAIT);
4558 values_h->int_at_put(1, java_lang_Thread::PARKED);
4559 break;
4560 }
4561 case JAVA_THREAD_STATE_TIMED_WAITING : {
4562 typeArrayOop r = oopFactory::new_typeArray(T_INT, 3, CHECK_NULL);
4563 values_h = typeArrayHandle(THREAD, r);
4564 values_h->int_at_put(0, java_lang_Thread::SLEEPING);
4565 values_h->int_at_put(1, java_lang_Thread::IN_OBJECT_WAIT_TIMED);
4566 values_h->int_at_put(2, java_lang_Thread::PARKED_TIMED);
4567 break;
4568 }
4569 case JAVA_THREAD_STATE_TERMINATED : {
4570 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL);
4571 values_h = typeArrayHandle(THREAD, r);
4572 values_h->int_at_put(0, java_lang_Thread::TERMINATED);
4573 break;
4574 }
4575 default:
4576 // Unknown state - probably incompatible JDK version
4577 return NULL;
4578 }
4579
4580 return (jintArray) JNIHandles::make_local(env, values_h());
4581 }
4582 JVM_END
4583
4584
4585 JVM_ENTRY(jobjectArray, JVM_GetThreadStateNames(JNIEnv* env,
4586 jint javaThreadState,
4587 jintArray values))
4588 {
4589 // If new thread states are added in future JDK and VM versions,
4590 // this should check if the JDK version is compatible with thread
4591 // states supported by the VM. Return NULL if not compatible.
4592 //
4593 // This function must map the VM java_lang_Thread::ThreadStatus
4594 // to the Java thread state that the JDK supports.
4595 //
4596
4597 ResourceMark rm;
4598
4599 // Check if threads is null
4600 if (values == NULL) {
4601 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
4602 }
4603
4604 typeArrayOop v = typeArrayOop(JNIHandles::resolve_non_null(values));
4605 typeArrayHandle values_h(THREAD, v);
4606
4607 objArrayHandle names_h;
4608 switch (javaThreadState) {
4609 case JAVA_THREAD_STATE_NEW : {
4610 assert(values_h->length() == 1 &&
4611 values_h->int_at(0) == java_lang_Thread::NEW,
4612 "Invalid threadStatus value");
4613
4614 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4615 1, /* only 1 substate */
4616 CHECK_NULL);
4617 names_h = objArrayHandle(THREAD, r);
4618 Handle name = java_lang_String::create_from_str("NEW", CHECK_NULL);
4619 names_h->obj_at_put(0, name());
4620 break;
4621 }
4622 case JAVA_THREAD_STATE_RUNNABLE : {
4623 assert(values_h->length() == 1 &&
4624 values_h->int_at(0) == java_lang_Thread::RUNNABLE,
4625 "Invalid threadStatus value");
4626
4627 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4628 1, /* only 1 substate */
4629 CHECK_NULL);
4630 names_h = objArrayHandle(THREAD, r);
4631 Handle name = java_lang_String::create_from_str("RUNNABLE", CHECK_NULL);
4632 names_h->obj_at_put(0, name());
4633 break;
4634 }
4635 case JAVA_THREAD_STATE_BLOCKED : {
4636 assert(values_h->length() == 1 &&
4637 values_h->int_at(0) == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER,
4638 "Invalid threadStatus value");
4639
4640 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4641 1, /* only 1 substate */
4642 CHECK_NULL);
4643 names_h = objArrayHandle(THREAD, r);
4644 Handle name = java_lang_String::create_from_str("BLOCKED", CHECK_NULL);
4645 names_h->obj_at_put(0, name());
4646 break;
4647 }
4648 case JAVA_THREAD_STATE_WAITING : {
4649 assert(values_h->length() == 2 &&
4650 values_h->int_at(0) == java_lang_Thread::IN_OBJECT_WAIT &&
4651 values_h->int_at(1) == java_lang_Thread::PARKED,
4652 "Invalid threadStatus value");
4653 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4654 2, /* number of substates */
4655 CHECK_NULL);
4656 names_h = objArrayHandle(THREAD, r);
4657 Handle name0 = java_lang_String::create_from_str("WAITING.OBJECT_WAIT",
4658 CHECK_NULL);
4659 Handle name1 = java_lang_String::create_from_str("WAITING.PARKED",
4660 CHECK_NULL);
4661 names_h->obj_at_put(0, name0());
4662 names_h->obj_at_put(1, name1());
4663 break;
4664 }
4665 case JAVA_THREAD_STATE_TIMED_WAITING : {
4666 assert(values_h->length() == 3 &&
4667 values_h->int_at(0) == java_lang_Thread::SLEEPING &&
4668 values_h->int_at(1) == java_lang_Thread::IN_OBJECT_WAIT_TIMED &&
4669 values_h->int_at(2) == java_lang_Thread::PARKED_TIMED,
4670 "Invalid threadStatus value");
4671 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4672 3, /* number of substates */
4673 CHECK_NULL);
4674 names_h = objArrayHandle(THREAD, r);
4675 Handle name0 = java_lang_String::create_from_str("TIMED_WAITING.SLEEPING",
4676 CHECK_NULL);
4677 Handle name1 = java_lang_String::create_from_str("TIMED_WAITING.OBJECT_WAIT",
4678 CHECK_NULL);
4679 Handle name2 = java_lang_String::create_from_str("TIMED_WAITING.PARKED",
4680 CHECK_NULL);
4681 names_h->obj_at_put(0, name0());
4682 names_h->obj_at_put(1, name1());
4683 names_h->obj_at_put(2, name2());
4684 break;
4685 }
4686 case JAVA_THREAD_STATE_TERMINATED : {
4687 assert(values_h->length() == 1 &&
4688 values_h->int_at(0) == java_lang_Thread::TERMINATED,
4689 "Invalid threadStatus value");
4690 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4691 1, /* only 1 substate */
4692 CHECK_NULL);
4693 names_h = objArrayHandle(THREAD, r);
4694 Handle name = java_lang_String::create_from_str("TERMINATED", CHECK_NULL);
4695 names_h->obj_at_put(0, name());
4696 break;
4697 }
4698 default:
4699 // Unknown state - probably incompatible JDK version
4700 return NULL;
4701 }
4702 return (jobjectArray) JNIHandles::make_local(env, names_h());
4703 }
4704 JVM_END
4705
4706 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
4707 {
4708 memset(info, 0, info_size);
4709
4710 info->jvm_version = Abstract_VM_Version::jvm_version();
4711 info->update_version = 0; /* 0 in HotSpot Express VM */
4712 info->special_update_version = 0; /* 0 in HotSpot Express VM */
4713
4714 // when we add a new capability in the jvm_version_info struct, we should also
4715 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
4716 // counter defined in runtimeService.cpp.
4717 info->is_attachable = AttachListener::is_attach_supported();
4718 }
4719 JVM_END