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
100 #ifndef USDT2
101 HS_DTRACE_PROBE_DECL1(hotspot, thread__sleep__begin, long long);
102 HS_DTRACE_PROBE_DECL1(hotspot, thread__sleep__end, int);
103 HS_DTRACE_PROBE_DECL0(hotspot, thread__yield);
104 #endif /* !USDT2 */
105
106 /*
107 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
108 such ctors and calls MUST NOT come between an oop declaration/init and its
109 usage because if objects are move this may cause various memory stomps, bus
110 errors and segfaults. Here is a cookbook for causing so called "naked oop
111 failures":
112
113 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
114 JVMWrapper("JVM_GetClassDeclaredFields");
115
116 // Object address to be held directly in mirror & not visible to GC
117 oop mirror = JNIHandles::resolve_non_null(ofClass);
118
119 // If this ctor can hit a safepoint, moving objects around, then
120 ComplexConstructor foo;
121
122 // Boom! mirror may point to JUNK instead of the intended object
123 (some dereference of mirror)
124
125 // Here's another call that may block for GC, making mirror stale
126 MutexLocker ml(some_lock);
127
128 // And here's an initializer that can result in a stale oop
129 // all in one step.
130 oop o = call_that_can_throw_exception(TRAPS);
131
132
133 The solution is to keep the oop declaration BELOW the ctor or function
134 call that might cause a GC, do another resolve to reassign the oop, or
135 consider use of a Handle instead of an oop so there is immunity from object
136 motion. But note that the "QUICK" entries below do not have a handlemark
137 and thus can only support use of handles passed in.
138 */
139
140 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
141 ResourceMark rm;
142 int line_number = -1;
143 const char * source_file = NULL;
144 const char * trace = "explicit";
145 InstanceKlass* caller = NULL;
146 JavaThread* jthread = JavaThread::current();
147 if (jthread->has_last_Java_frame()) {
148 vframeStream vfst(jthread);
149
150 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
151 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController", CHECK);
152 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
153 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction", CHECK);
154 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
155
156 Method* last_caller = NULL;
157
158 while (!vfst.at_end()) {
159 Method* m = vfst.method();
160 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
161 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
162 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
163 break;
164 }
165 last_caller = m;
166 vfst.next();
167 }
168 // if this is called from Class.forName0 and that is called from Class.forName,
169 // then print the caller of Class.forName. If this is Class.loadClass, then print
170 // that caller, otherwise keep quiet since this should be picked up elsewhere.
171 bool found_it = false;
172 if (!vfst.at_end() &&
173 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
174 vfst.method()->name() == vmSymbols::forName0_name()) {
175 vfst.next();
176 if (!vfst.at_end() &&
177 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
178 vfst.method()->name() == vmSymbols::forName_name()) {
179 vfst.next();
180 found_it = true;
181 }
182 } else if (last_caller != NULL &&
183 last_caller->method_holder()->name() ==
184 vmSymbols::java_lang_ClassLoader() &&
185 (last_caller->name() == vmSymbols::loadClassInternal_name() ||
186 last_caller->name() == vmSymbols::loadClass_name())) {
187 found_it = true;
188 } else if (!vfst.at_end()) {
189 if (vfst.method()->is_native()) {
190 // JNI call
191 found_it = true;
192 }
193 }
194 if (found_it && !vfst.at_end()) {
195 // found the caller
196 caller = vfst.method()->method_holder();
197 line_number = vfst.method()->line_number_from_bci(vfst.bci());
198 if (line_number == -1) {
199 // show method name if it's a native method
200 trace = vfst.method()->name_and_sig_as_C_string();
201 }
202 Symbol* s = caller->source_file_name();
203 if (s != NULL) {
204 source_file = s->as_C_string();
205 }
206 }
207 }
208 if (caller != NULL) {
209 if (to_class != caller) {
210 const char * from = caller->external_name();
211 const char * to = to_class->external_name();
212 // print in a single call to reduce interleaving between threads
213 if (source_file != NULL) {
214 tty->print("RESOLVE %s %s %s:%d (%s)\n", from, to, source_file, line_number, trace);
215 } else {
216 tty->print("RESOLVE %s %s (%s)\n", from, to, trace);
217 }
218 }
219 }
220 }
221
222 void trace_class_resolution(Klass* to_class) {
223 EXCEPTION_MARK;
224 trace_class_resolution_impl(to_class, THREAD);
225 if (HAS_PENDING_EXCEPTION) {
226 CLEAR_PENDING_EXCEPTION;
227 }
228 }
229
230 // Wrapper to trace JVM functions
231
232 #ifdef ASSERT
233 class JVMTraceWrapper : public StackObj {
234 public:
235 JVMTraceWrapper(const char* format, ...) ATTRIBUTE_PRINTF(2, 3) {
236 if (TraceJVMCalls) {
237 va_list ap;
238 va_start(ap, format);
239 tty->print("JVM ");
240 tty->vprint_cr(format, ap);
241 va_end(ap);
242 }
243 }
244 };
245
246 Histogram* JVMHistogram;
247 volatile jint JVMHistogram_lock = 0;
248
249 class JVMHistogramElement : public HistogramElement {
250 public:
251 JVMHistogramElement(const char* name);
252 };
253
254 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
255 _name = elementName;
256 uintx count = 0;
257
258 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
259 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
260 count +=1;
261 if ( (WarnOnStalledSpinLock > 0)
262 && (count % WarnOnStalledSpinLock == 0)) {
263 warning("JVMHistogram_lock seems to be stalled");
264 }
265 }
266 }
267
268 if(JVMHistogram == NULL)
269 JVMHistogram = new Histogram("JVM Call Counts",100);
270
271 JVMHistogram->add_element(this);
272 Atomic::dec(&JVMHistogram_lock);
273 }
274
275 #define JVMCountWrapper(arg) \
276 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
277 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
278
279 #define JVMWrapper(arg1) JVMCountWrapper(arg1); JVMTraceWrapper(arg1)
280 #define JVMWrapper2(arg1, arg2) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2)
281 #define JVMWrapper3(arg1, arg2, arg3) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3)
282 #define JVMWrapper4(arg1, arg2, arg3, arg4) JVMCountWrapper(arg1); JVMTraceWrapper(arg1, arg2, arg3, arg4)
283 #else
284 #define JVMWrapper(arg1)
285 #define JVMWrapper2(arg1, arg2)
286 #define JVMWrapper3(arg1, arg2, arg3)
287 #define JVMWrapper4(arg1, arg2, arg3, arg4)
288 #endif
289
290
291 // Interface version /////////////////////////////////////////////////////////////////////
292
293
294 JVM_LEAF(jint, JVM_GetInterfaceVersion())
295 return JVM_INTERFACE_VERSION;
296 JVM_END
297
298
299 // java.lang.System //////////////////////////////////////////////////////////////////////
300
301
302 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
303 JVMWrapper("JVM_CurrentTimeMillis");
304 return os::javaTimeMillis();
305 JVM_END
306
307 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
308 JVMWrapper("JVM_NanoTime");
309 return os::javaTimeNanos();
310 JVM_END
311
312
313 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
314 jobject dst, jint dst_pos, jint length))
315 JVMWrapper("JVM_ArrayCopy");
316 // Check if we have null pointers
317 if (src == NULL || dst == NULL) {
318 THROW(vmSymbols::java_lang_NullPointerException());
319 }
320 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
321 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
322 assert(s->is_oop(), "JVM_ArrayCopy: src not an oop");
323 assert(d->is_oop(), "JVM_ArrayCopy: dst not an oop");
324 // Do copy
325 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
326 JVM_END
327
328
329 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
330 JavaValue r(T_OBJECT);
331 // public synchronized Object put(Object key, Object value);
332 HandleMark hm(THREAD);
333 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
334 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
335 JavaCalls::call_virtual(&r,
336 props,
337 KlassHandle(THREAD, SystemDictionary::Properties_klass()),
338 vmSymbols::put_name(),
339 vmSymbols::object_object_object_signature(),
340 key_str,
341 value_str,
342 THREAD);
343 }
344
345
346 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
347
348
349 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
350 JVMWrapper("JVM_InitProperties");
351 ResourceMark rm;
352
353 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
354
355 // System property list includes both user set via -D option and
356 // jvm system specific properties.
357 for (SystemProperty* p = Arguments::system_properties(); p != NULL; p = p->next()) {
358 PUTPROP(props, p->key(), p->value());
359 }
360
361 // Convert the -XX:MaxDirectMemorySize= command line flag
362 // to the sun.nio.MaxDirectMemorySize property.
363 // Do this after setting user properties to prevent people
364 // from setting the value with a -D option, as requested.
365 {
366 if (FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
367 PUTPROP(props, "sun.nio.MaxDirectMemorySize", "-1");
368 } else {
369 char as_chars[256];
370 jio_snprintf(as_chars, sizeof(as_chars), UINTX_FORMAT, MaxDirectMemorySize);
371 PUTPROP(props, "sun.nio.MaxDirectMemorySize", as_chars);
372 }
373 }
374
375 // JVM monitoring and management support
376 // Add the sun.management.compiler property for the compiler's name
377 {
378 #undef CSIZE
379 #if defined(_LP64) || defined(_WIN64)
380 #define CSIZE "64-Bit "
381 #else
382 #define CSIZE
383 #endif // 64bit
384
385 #ifdef TIERED
386 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
387 #else
388 #if defined(COMPILER1)
389 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
390 #elif defined(COMPILER2)
391 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
392 #else
393 const char* compiler_name = "";
394 #endif // compilers
395 #endif // TIERED
396
397 if (*compiler_name != '\0' &&
398 (Arguments::mode() != Arguments::_int)) {
399 PUTPROP(props, "sun.management.compiler", compiler_name);
400 }
401 }
402
403 const char* enableSharedLookupCache = "false";
404 #if INCLUDE_CDS
405 if (ClassLoaderExt::is_lookup_cache_enabled()) {
406 enableSharedLookupCache = "true";
407 }
408 #endif
409 PUTPROP(props, "sun.cds.enableSharedLookupCache", enableSharedLookupCache);
410
411 return properties;
412 JVM_END
413
414
415 /*
416 * Return the temporary directory that the VM uses for the attach
417 * and perf data files.
418 *
419 * It is important that this directory is well-known and the
420 * same for all VM instances. It cannot be affected by configuration
421 * variables such as java.io.tmpdir.
422 */
423 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
424 JVMWrapper("JVM_GetTemporaryDirectory");
425 HandleMark hm(THREAD);
426 const char* temp_dir = os::get_temp_directory();
427 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
428 return (jstring) JNIHandles::make_local(env, h());
429 JVM_END
430
431
432 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
433
434 extern volatile jint vm_created;
435
436 JVM_ENTRY_NO_ENV(void, JVM_Exit(jint code))
437 if (vm_created != 0 && (code == 0)) {
438 // The VM is about to exit. We call back into Java to check whether finalizers should be run
439 Universe::run_finalizers_on_exit();
440 }
441 before_exit(thread);
442 vm_exit(code);
443 JVM_END
444
445
446 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
447 JVMWrapper("JVM_BeforeHalt");
448 EventShutdown event;
449 if (event.should_commit()) {
450 event.set_reason("Shutdown requested from Java");
451 event.commit();
452 }
453 JVM_END
454
455
456 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
457 before_exit(thread);
458 vm_exit(code);
459 JVM_END
460
461
462 JVM_LEAF(void, JVM_OnExit(void (*func)(void)))
463 register_on_exit_function(func);
464 JVM_END
465
466
467 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
468 JVMWrapper("JVM_GC");
469 if (!DisableExplicitGC) {
470 Universe::heap()->collect(GCCause::_java_lang_system_gc);
471 }
472 JVM_END
473
474
475 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
476 JVMWrapper("JVM_MaxObjectInspectionAge");
477 return Universe::heap()->millis_since_last_gc();
478 JVM_END
479
480
481 JVM_LEAF(void, JVM_TraceInstructions(jboolean on))
482 if (PrintJVMWarnings) warning("JVM_TraceInstructions not supported");
483 JVM_END
484
485
486 JVM_LEAF(void, JVM_TraceMethodCalls(jboolean on))
487 if (PrintJVMWarnings) warning("JVM_TraceMethodCalls not supported");
488 JVM_END
489
490 static inline jlong convert_size_t_to_jlong(size_t val) {
491 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
492 NOT_LP64 (return (jlong)val;)
493 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
494 }
495
496 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
497 JVMWrapper("JVM_TotalMemory");
498 size_t n = Universe::heap()->capacity();
499 return convert_size_t_to_jlong(n);
500 JVM_END
501
502
503 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
504 JVMWrapper("JVM_FreeMemory");
505 CollectedHeap* ch = Universe::heap();
506 size_t n;
507 {
508 MutexLocker x(Heap_lock);
509 n = ch->capacity() - ch->used();
510 }
511 return convert_size_t_to_jlong(n);
512 JVM_END
513
514
515 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
516 JVMWrapper("JVM_MaxMemory");
517 size_t n = Universe::heap()->max_capacity();
518 return convert_size_t_to_jlong(n);
519 JVM_END
520
521
522 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
523 JVMWrapper("JVM_ActiveProcessorCount");
524 return os::active_processor_count();
525 JVM_END
526
527
528 JVM_ENTRY_NO_ENV(jboolean, JVM_IsUseContainerSupport(void))
529 JVMWrapper("JVM_IsUseContainerSupport");
530 #ifdef TARGET_OS_FAMILY_linux
531 if (UseContainerSupport) {
532 return JNI_TRUE;
533 }
534 #endif
535 return JNI_FALSE;
536 JVM_END
537
538
539
540 // java.lang.Throwable //////////////////////////////////////////////////////
541
542
543 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
544 JVMWrapper("JVM_FillInStackTrace");
545 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
546 java_lang_Throwable::fill_in_stack_trace(exception);
547 JVM_END
548
549
550 JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable))
551 JVMWrapper("JVM_GetStackTraceDepth");
552 oop exception = JNIHandles::resolve(throwable);
553 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD);
554 JVM_END
555
556
557 JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index))
558 JVMWrapper("JVM_GetStackTraceElement");
559 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC
560 oop exception = JNIHandles::resolve(throwable);
561 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL);
562 return JNIHandles::make_local(env, element);
563 JVM_END
564
565
566 // java.lang.Object ///////////////////////////////////////////////
567
568
569 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
570 JVMWrapper("JVM_IHashCode");
571 // as implemented in the classic virtual machine; return 0 if object is NULL
572 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
573 JVM_END
574
575
576 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
577 JVMWrapper("JVM_MonitorWait");
578 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
579 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
580 if (JvmtiExport::should_post_monitor_wait()) {
581 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
582
583 // The current thread already owns the monitor and it has not yet
584 // been added to the wait queue so the current thread cannot be
585 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
586 // event handler cannot accidentally consume an unpark() meant for
587 // the ParkEvent associated with this ObjectMonitor.
588 }
589 ObjectSynchronizer::wait(obj, ms, CHECK);
590 JVM_END
591
592
593 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
594 JVMWrapper("JVM_MonitorNotify");
595 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
596 ObjectSynchronizer::notify(obj, CHECK);
597 JVM_END
598
599
600 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
601 JVMWrapper("JVM_MonitorNotifyAll");
602 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
603 ObjectSynchronizer::notifyall(obj, CHECK);
604 JVM_END
605
606
607 static void fixup_cloned_reference(ReferenceType ref_type, oop src, oop clone) {
608 // If G1 is enabled then we need to register a non-null referent
609 // with the SATB barrier.
610 #if INCLUDE_ALL_GCS
611 if (UseG1GC) {
612 oop referent = java_lang_ref_Reference::referent(clone);
613 if (referent != NULL) {
614 G1SATBCardTableModRefBS::enqueue(referent);
615 }
616 }
617 #endif // INCLUDE_ALL_GCS
618 if ((java_lang_ref_Reference::next(clone) != NULL) ||
619 (java_lang_ref_Reference::queue(clone) == java_lang_ref_ReferenceQueue::ENQUEUED_queue())) {
620 // If the source has been enqueued or is being enqueued, don't
621 // register the clone with a queue.
622 java_lang_ref_Reference::set_queue(clone, java_lang_ref_ReferenceQueue::NULL_queue());
623 }
624 // discovered and next are list links; the clone is not in those lists.
625 java_lang_ref_Reference::set_discovered(clone, NULL);
626 java_lang_ref_Reference::set_next(clone, NULL);
627 }
628
629 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
630 JVMWrapper("JVM_Clone");
631 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
632 const KlassHandle klass (THREAD, obj->klass());
633 JvmtiVMObjectAllocEventCollector oam;
634
635 #ifdef ASSERT
636 // Just checking that the cloneable flag is set correct
637 if (obj->is_array()) {
638 guarantee(klass->is_cloneable(), "all arrays are cloneable");
639 } else {
640 guarantee(obj->is_instance(), "should be instanceOop");
641 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
642 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
643 }
644 #endif
645
646 // Check if class of obj supports the Cloneable interface.
647 // All arrays are considered to be cloneable (See JLS 20.1.5)
648 if (!klass->is_cloneable()) {
649 ResourceMark rm(THREAD);
650 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
651 }
652
653 // Make shallow object copy
654 ReferenceType ref_type = REF_NONE;
655 const int size = obj->size();
656 oop new_obj_oop = NULL;
657 if (obj->is_array()) {
658 const int length = ((arrayOop)obj())->length();
659 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
660 } else {
661 ref_type = InstanceKlass::cast(klass())->reference_type();
662 assert((ref_type == REF_NONE) ==
663 !klass->is_subclass_of(SystemDictionary::Reference_klass()),
664 "invariant");
665 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
666 }
667
668 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
669 // is modifying a reference field in the clonee, a non-oop-atomic copy might
670 // be suspended in the middle of copying the pointer and end up with parts
671 // of two different pointers in the field. Subsequent dereferences will crash.
672 // 4846409: an oop-copy of objects with long or double fields or arrays of same
673 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
674 // of oops. We know objects are aligned on a minimum of an jlong boundary.
675 // The same is true of StubRoutines::object_copy and the various oop_copy
676 // variants, and of the code generated by the inline_native_clone intrinsic.
677 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
678 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop,
679 (size_t)align_object_size(size) / HeapWordsPerLong);
680 // Clear the header
681 new_obj_oop->init_mark();
682
683 // Store check (mark entire object and let gc sort it out)
684 BarrierSet* bs = Universe::heap()->barrier_set();
685 assert(bs->has_write_region_opt(), "Barrier set does not have write_region");
686 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size));
687
688 // If cloning a Reference, set Reference fields to a safe state.
689 // Fixup must be completed before any safepoint.
690 if (ref_type != REF_NONE) {
691 fixup_cloned_reference(ref_type, obj(), new_obj_oop);
692 }
693
694 Handle new_obj(THREAD, new_obj_oop);
695 // Special handling for MemberNames. Since they contain Method* metadata, they
696 // must be registered so that RedefineClasses can fix metadata contained in them.
697 if (java_lang_invoke_MemberName::is_instance(new_obj()) &&
698 java_lang_invoke_MemberName::is_method(new_obj())) {
699 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj());
700 // MemberName may be unresolved, so doesn't need registration until resolved.
701 if (method != NULL) {
702 methodHandle m(THREAD, method);
703 // This can safepoint and redefine method, so need both new_obj and method
704 // in a handle, for two different reasons. new_obj can move, method can be
705 // deleted if nothing is using it on the stack.
706 m->method_holder()->add_member_name(new_obj(), false);
707 }
708 }
709
710 // Caution: this involves a java upcall, so the clone should be
711 // "gc-robust" by this stage.
712 if (klass->has_finalizer()) {
713 assert(obj->is_instance(), "should be instanceOop");
714 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
715 new_obj = Handle(THREAD, new_obj_oop);
716 }
717
718 return JNIHandles::make_local(env, new_obj());
719 JVM_END
720
721 // java.lang.Compiler ////////////////////////////////////////////////////
722
723 // The initial cuts of the HotSpot VM will not support JITs, and all existing
724 // JITs would need extensive changes to work with HotSpot. The JIT-related JVM
725 // functions are all silently ignored unless JVM warnings are printed.
726
727 JVM_LEAF(void, JVM_InitializeCompiler (JNIEnv *env, jclass compCls))
728 if (PrintJVMWarnings) warning("JVM_InitializeCompiler not supported");
729 JVM_END
730
731
732 JVM_LEAF(jboolean, JVM_IsSilentCompiler(JNIEnv *env, jclass compCls))
733 if (PrintJVMWarnings) warning("JVM_IsSilentCompiler not supported");
734 return JNI_FALSE;
735 JVM_END
736
737
738 JVM_LEAF(jboolean, JVM_CompileClass(JNIEnv *env, jclass compCls, jclass cls))
739 if (PrintJVMWarnings) warning("JVM_CompileClass not supported");
740 return JNI_FALSE;
741 JVM_END
742
743
744 JVM_LEAF(jboolean, JVM_CompileClasses(JNIEnv *env, jclass cls, jstring jname))
745 if (PrintJVMWarnings) warning("JVM_CompileClasses not supported");
746 return JNI_FALSE;
747 JVM_END
748
749
750 JVM_LEAF(jobject, JVM_CompilerCommand(JNIEnv *env, jclass compCls, jobject arg))
751 if (PrintJVMWarnings) warning("JVM_CompilerCommand not supported");
752 return NULL;
753 JVM_END
754
755
756 JVM_LEAF(void, JVM_EnableCompiler(JNIEnv *env, jclass compCls))
757 if (PrintJVMWarnings) warning("JVM_EnableCompiler not supported");
758 JVM_END
759
760
761 JVM_LEAF(void, JVM_DisableCompiler(JNIEnv *env, jclass compCls))
762 if (PrintJVMWarnings) warning("JVM_DisableCompiler not supported");
763 JVM_END
764
765
766
767 // Error message support //////////////////////////////////////////////////////
768
769 JVM_LEAF(jint, JVM_GetLastErrorString(char *buf, int len))
770 JVMWrapper("JVM_GetLastErrorString");
771 return (jint)os::lasterror(buf, len);
772 JVM_END
773
774
775 // java.io.File ///////////////////////////////////////////////////////////////
776
777 JVM_LEAF(char*, JVM_NativePath(char* path))
778 JVMWrapper2("JVM_NativePath (%s)", path);
779 return os::native_path(path);
780 JVM_END
781
782
783 // java.nio.Bits ///////////////////////////////////////////////////////////////
784
785 #define MAX_OBJECT_SIZE \
786 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
787 + ((julong)max_jint * sizeof(double)) )
788
789 static inline jlong field_offset_to_byte_offset(jlong field_offset) {
790 return field_offset;
791 }
792
793 static inline void assert_field_offset_sane(oop p, jlong field_offset) {
794 #ifdef ASSERT
795 jlong byte_offset = field_offset_to_byte_offset(field_offset);
796
797 if (p != NULL) {
798 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
799 if (byte_offset == (jint)byte_offset) {
800 void* ptr_plus_disp = (address)p + byte_offset;
801 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
802 "raw [ptr+disp] must be consistent with oop::field_base");
803 }
804 jlong p_size = HeapWordSize * (jlong)(p->size());
805 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT
806 " > object's size " INT64_FORMAT,
807 (int64_t)byte_offset, (int64_t)p_size));
808 }
809 #endif
810 }
811
812 static inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
813 assert_field_offset_sane(p, field_offset);
814 jlong byte_offset = field_offset_to_byte_offset(field_offset);
815
816 if (sizeof(char*) == sizeof(jint)) { // (this constant folds!)
817 return (address)p + (jint) byte_offset;
818 } else {
819 return (address)p + byte_offset;
820 }
821 }
822
823 // This function is a leaf since if the source and destination are both in native memory
824 // the copy may potentially be very large, and we don't want to disable GC if we can avoid it.
825 // If either source or destination (or both) are on the heap, the function will enter VM using
826 // JVM_ENTRY_FROM_LEAF
827 JVM_LEAF(void, JVM_CopySwapMemory(JNIEnv *env, jobject srcObj, jlong srcOffset,
828 jobject dstObj, jlong dstOffset, jlong size,
829 jlong elemSize)) {
830
831 size_t sz = (size_t)size;
832 size_t esz = (size_t)elemSize;
833
834 if (srcObj == NULL && dstObj == NULL) {
835 // Both src & dst are in native memory
836 address src = (address)srcOffset;
837 address dst = (address)dstOffset;
838
839 Copy::conjoint_swap(src, dst, sz, esz);
840 } else {
841 // At least one of src/dst are on heap, transition to VM to access raw pointers
842
843 JVM_ENTRY_FROM_LEAF(env, void, JVM_CopySwapMemory) {
844 oop srcp = JNIHandles::resolve(srcObj);
845 oop dstp = JNIHandles::resolve(dstObj);
846
847 address src = (address)index_oop_from_field_offset_long(srcp, srcOffset);
848 address dst = (address)index_oop_from_field_offset_long(dstp, dstOffset);
849
850 Copy::conjoint_swap(src, dst, sz, esz);
851 } JVM_END
852 }
853 } JVM_END
854
855
856 // Misc. class handling ///////////////////////////////////////////////////////////
857
858
859 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
860 JVMWrapper("JVM_GetCallerClass");
861
862 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
863 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
864 // temporarily for existing code to use until a replacement API is defined.
865 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
866 Klass* k = thread->security_get_caller_class(depth);
867 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
868 }
869
870 // Getting the class of the caller frame.
871 //
872 // The call stack at this point looks something like this:
873 //
874 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
875 // [1] [ @CallerSensitive API.method ]
876 // [.] [ (skipped intermediate frames) ]
877 // [n] [ caller ]
878 vframeStream vfst(thread);
879 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
880 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
881 Method* m = vfst.method();
882 assert(m != NULL, "sanity");
883 switch (n) {
884 case 0:
885 // This must only be called from Reflection.getCallerClass
886 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
887 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
888 }
889 // fall-through
890 case 1:
891 // Frame 0 and 1 must be caller sensitive.
892 if (!m->caller_sensitive()) {
893 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
894 }
895 break;
896 default:
897 if (!m->is_ignored_by_security_stack_walk()) {
898 // We have reached the desired frame; return the holder class.
899 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
900 }
901 break;
902 }
903 }
904 return NULL;
905 JVM_END
906
907
908 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
909 JVMWrapper("JVM_FindPrimitiveClass");
910 oop mirror = NULL;
911 BasicType t = name2type(utf);
912 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
913 mirror = Universe::java_mirror(t);
914 }
915 if (mirror == NULL) {
916 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
917 } else {
918 return (jclass) JNIHandles::make_local(env, mirror);
919 }
920 JVM_END
921
922
923 JVM_ENTRY(void, JVM_ResolveClass(JNIEnv* env, jclass cls))
924 JVMWrapper("JVM_ResolveClass");
925 if (PrintJVMWarnings) warning("JVM_ResolveClass not implemented");
926 JVM_END
927
928
929 JVM_ENTRY(jboolean, JVM_KnownToNotExist(JNIEnv *env, jobject loader, const char *classname))
930 JVMWrapper("JVM_KnownToNotExist");
931 #if INCLUDE_CDS
932 return ClassLoaderExt::known_to_not_exist(env, loader, classname, THREAD);
933 #else
934 return false;
935 #endif
936 JVM_END
937
938
939 JVM_ENTRY(jobjectArray, JVM_GetResourceLookupCacheURLs(JNIEnv *env, jobject loader))
940 JVMWrapper("JVM_GetResourceLookupCacheURLs");
941 #if INCLUDE_CDS
942 return ClassLoaderExt::get_lookup_cache_urls(env, loader, THREAD);
943 #else
944 return NULL;
945 #endif
946 JVM_END
947
948
949 JVM_ENTRY(jintArray, JVM_GetResourceLookupCache(JNIEnv *env, jobject loader, const char *resource_name))
950 JVMWrapper("JVM_GetResourceLookupCache");
951 #if INCLUDE_CDS
952 return ClassLoaderExt::get_lookup_cache(env, loader, resource_name, THREAD);
953 #else
954 return NULL;
955 #endif
956 JVM_END
957
958
959 // Returns a class loaded by the bootstrap class loader; or null
960 // if not found. ClassNotFoundException is not thrown.
961 //
962 // Rationale behind JVM_FindClassFromBootLoader
963 // a> JVM_FindClassFromClassLoader was never exported in the export tables.
964 // b> because of (a) java.dll has a direct dependecy on the unexported
965 // private symbol "_JVM_FindClassFromClassLoader@20".
966 // c> the launcher cannot use the private symbol as it dynamically opens
967 // the entry point, so if something changes, the launcher will fail
968 // unexpectedly at runtime, it is safest for the launcher to dlopen a
969 // stable exported interface.
970 // d> re-exporting JVM_FindClassFromClassLoader as public, will cause its
971 // signature to change from _JVM_FindClassFromClassLoader@20 to
972 // JVM_FindClassFromClassLoader and will not be backward compatible
973 // with older JDKs.
974 // Thus a public/stable exported entry point is the right solution,
975 // public here means public in linker semantics, and is exported only
976 // to the JDK, and is not intended to be a public API.
977
978 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
979 const char* name))
980 JVMWrapper2("JVM_FindClassFromBootLoader %s", name);
981
982 // Java libraries should ensure that name is never null...
983 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
984 // It's impossible to create this class; the name cannot fit
985 // into the constant pool.
986 return NULL;
987 }
988
989 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
990 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
991 if (k == NULL) {
992 return NULL;
993 }
994
995 if (TraceClassResolution) {
996 trace_class_resolution(k);
997 }
998 return (jclass) JNIHandles::make_local(env, k->java_mirror());
999 JVM_END
1000
1001 // Not used; JVM_FindClassFromCaller replaces this.
1002 JVM_ENTRY(jclass, JVM_FindClassFromClassLoader(JNIEnv* env, const char* name,
1003 jboolean init, jobject loader,
1004 jboolean throwError))
1005 JVMWrapper3("JVM_FindClassFromClassLoader %s throw %s", name,
1006 throwError ? "error" : "exception");
1007 // Java libraries should ensure that name is never null...
1008 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
1009 // It's impossible to create this class; the name cannot fit
1010 // into the constant pool.
1011 if (throwError) {
1012 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
1013 } else {
1014 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
1015 }
1016 }
1017 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
1018 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1019 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1020 Handle(), throwError, THREAD);
1021
1022 if (TraceClassResolution && result != NULL) {
1023 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1024 }
1025 return result;
1026 JVM_END
1027
1028 // Find a class with this name in this loader, using the caller's protection domain.
1029 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
1030 jboolean init, jobject loader,
1031 jclass caller))
1032 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name);
1033 // Java libraries should ensure that name is never null...
1034 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
1035 // It's impossible to create this class; the name cannot fit
1036 // into the constant pool.
1037 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
1038 }
1039
1040 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
1041
1042 oop loader_oop = JNIHandles::resolve(loader);
1043 oop from_class = JNIHandles::resolve(caller);
1044 oop protection_domain = NULL;
1045 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
1046 // NPE. Put it in another way, the bootstrap class loader has all permission and
1047 // thus no checkPackageAccess equivalence in the VM class loader.
1048 // The caller is also passed as NULL by the java code if there is no security
1049 // manager to avoid the performance cost of getting the calling class.
1050 if (from_class != NULL && loader_oop != NULL) {
1051 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
1052 }
1053
1054 Handle h_loader(THREAD, loader_oop);
1055 Handle h_prot(THREAD, protection_domain);
1056 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1057 h_prot, false, THREAD);
1058
1059 if (TraceClassResolution && result != NULL) {
1060 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1061 }
1062 return result;
1063 JVM_END
1064
1065 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1066 jboolean init, jclass from))
1067 JVMWrapper2("JVM_FindClassFromClass %s", name);
1068 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
1069 // It's impossible to create this class; the name cannot fit
1070 // into the constant pool.
1071 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
1072 }
1073 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
1074 oop from_class_oop = JNIHandles::resolve(from);
1075 Klass* from_class = (from_class_oop == NULL)
1076 ? (Klass*)NULL
1077 : java_lang_Class::as_Klass(from_class_oop);
1078 oop class_loader = NULL;
1079 oop protection_domain = NULL;
1080 if (from_class != NULL) {
1081 class_loader = from_class->class_loader();
1082 protection_domain = from_class->protection_domain();
1083 }
1084 Handle h_loader(THREAD, class_loader);
1085 Handle h_prot (THREAD, protection_domain);
1086 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1087 h_prot, true, thread);
1088
1089 if (TraceClassResolution && result != NULL) {
1090 // this function is generally only used for class loading during verification.
1091 ResourceMark rm;
1092 oop from_mirror = JNIHandles::resolve_non_null(from);
1093 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
1094 const char * from_name = from_class->external_name();
1095
1096 oop mirror = JNIHandles::resolve_non_null(result);
1097 Klass* to_class = java_lang_Class::as_Klass(mirror);
1098 const char * to = to_class->external_name();
1099 tty->print("RESOLVE %s %s (verification)\n", from_name, to);
1100 }
1101
1102 return result;
1103 JVM_END
1104
1105 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
1106 if (loader.is_null()) {
1107 return;
1108 }
1109
1110 // check whether the current caller thread holds the lock or not.
1111 // If not, increment the corresponding counter
1112 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
1113 ObjectSynchronizer::owner_self) {
1114 counter->inc();
1115 }
1116 }
1117
1118 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1119 // and JVM_DefineClassWithSourceCond()
1120 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
1121 jobject loader, const jbyte *buf,
1122 jsize len, jobject pd, const char *source,
1123 jboolean verify, TRAPS) {
1124 if (source == NULL) source = "__JVM_DefineClass__";
1125
1126 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1127 JavaThread* jt = (JavaThread*) THREAD;
1128
1129 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1130 ClassLoader::perf_define_appclass_selftime(),
1131 ClassLoader::perf_define_appclasses(),
1132 jt->get_thread_stat()->perf_recursion_counts_addr(),
1133 jt->get_thread_stat()->perf_timers_addr(),
1134 PerfClassTraceTime::DEFINE_CLASS);
1135
1136 if (UsePerfData) {
1137 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1138 }
1139
1140 // Since exceptions can be thrown, class initialization can take place
1141 // if name is NULL no check for class name in .class stream has to be made.
1142 TempNewSymbol class_name = NULL;
1143 if (name != NULL) {
1144 const int str_len = (int)strlen(name);
1145 if (str_len > Symbol::max_length()) {
1146 // It's impossible to create this class; the name cannot fit
1147 // into the constant pool.
1148 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
1149 }
1150 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
1151 }
1152
1153 ResourceMark rm(THREAD);
1154 ClassFileStream st((u1*) buf, len, (char *)source);
1155 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1156 if (UsePerfData) {
1157 is_lock_held_by_thread(class_loader,
1158 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
1159 THREAD);
1160 }
1161 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1162 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader,
1163 protection_domain, &st,
1164 verify != 0,
1165 CHECK_NULL);
1166
1167 if (TraceClassResolution && k != NULL) {
1168 trace_class_resolution(k);
1169 }
1170
1171 return (jclass) JNIHandles::make_local(env, k->java_mirror());
1172 }
1173
1174
1175 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1176 JVMWrapper2("JVM_DefineClass %s", name);
1177
1178 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD);
1179 JVM_END
1180
1181
1182 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1183 JVMWrapper2("JVM_DefineClassWithSource %s", name);
1184
1185 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD);
1186 JVM_END
1187
1188 JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name,
1189 jobject loader, const jbyte *buf,
1190 jsize len, jobject pd,
1191 const char *source, jboolean verify))
1192 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name);
1193
1194 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD);
1195 JVM_END
1196
1197 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1198 JVMWrapper("JVM_FindLoadedClass");
1199 ResourceMark rm(THREAD);
1200
1201 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1202 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
1203
1204 const char* str = java_lang_String::as_utf8_string(string());
1205 // Sanity check, don't expect null
1206 if (str == NULL) return NULL;
1207
1208 const int str_len = (int)strlen(str);
1209 if (str_len > Symbol::max_length()) {
1210 // It's impossible to create this class; the name cannot fit
1211 // into the constant pool.
1212 return NULL;
1213 }
1214 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
1215
1216 // Security Note:
1217 // The Java level wrapper will perform the necessary security check allowing
1218 // us to pass the NULL as the initiating class loader.
1219 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1220 if (UsePerfData) {
1221 is_lock_held_by_thread(h_loader,
1222 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1223 THREAD);
1224 }
1225
1226 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1227 h_loader,
1228 Handle(),
1229 CHECK_NULL);
1230 #if INCLUDE_CDS
1231 if (k == NULL) {
1232 // If the class is not already loaded, try to see if it's in the shared
1233 // archive for the current classloader (h_loader).
1234 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
1235 klass_name, h_loader, CHECK_NULL);
1236 k = ik();
1237 }
1238 #endif
1239 return (k == NULL) ? NULL :
1240 (jclass) JNIHandles::make_local(env, k->java_mirror());
1241 JVM_END
1242
1243
1244 // Reflection support //////////////////////////////////////////////////////////////////////////////
1245
1246 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1247 assert (cls != NULL, "illegal class");
1248 JVMWrapper("JVM_GetClassName");
1249 JvmtiVMObjectAllocEventCollector oam;
1250 ResourceMark rm(THREAD);
1251 const char* name;
1252 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1253 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1254 } else {
1255 // Consider caching interned string in Klass
1256 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1257 assert(k->is_klass(), "just checking");
1258 name = k->external_name();
1259 }
1260 oop result = StringTable::intern((char*) name, CHECK_NULL);
1261 return (jstring) JNIHandles::make_local(env, result);
1262 JVM_END
1263
1264
1265 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1266 JVMWrapper("JVM_GetClassInterfaces");
1267 JvmtiVMObjectAllocEventCollector oam;
1268 oop mirror = JNIHandles::resolve_non_null(cls);
1269
1270 // Special handling for primitive objects
1271 if (java_lang_Class::is_primitive(mirror)) {
1272 // Primitive objects does not have any interfaces
1273 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1274 return (jobjectArray) JNIHandles::make_local(env, r);
1275 }
1276
1277 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
1278 // Figure size of result array
1279 int size;
1280 if (klass->oop_is_instance()) {
1281 size = InstanceKlass::cast(klass())->local_interfaces()->length();
1282 } else {
1283 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass");
1284 size = 2;
1285 }
1286
1287 // Allocate result array
1288 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1289 objArrayHandle result (THREAD, r);
1290 // Fill in result
1291 if (klass->oop_is_instance()) {
1292 // Regular instance klass, fill in all local interfaces
1293 for (int index = 0; index < size; index++) {
1294 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
1295 result->obj_at_put(index, k->java_mirror());
1296 }
1297 } else {
1298 // All arrays implement java.lang.Cloneable and java.io.Serializable
1299 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1300 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1301 }
1302 return (jobjectArray) JNIHandles::make_local(env, result());
1303 JVM_END
1304
1305
1306 JVM_ENTRY(jobject, JVM_GetClassLoader(JNIEnv *env, jclass cls))
1307 JVMWrapper("JVM_GetClassLoader");
1308 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1309 return NULL;
1310 }
1311 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1312 oop loader = k->class_loader();
1313 return JNIHandles::make_local(env, loader);
1314 JVM_END
1315
1316
1317 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1318 JVMWrapper("JVM_IsInterface");
1319 oop mirror = JNIHandles::resolve_non_null(cls);
1320 if (java_lang_Class::is_primitive(mirror)) {
1321 return JNI_FALSE;
1322 }
1323 Klass* k = java_lang_Class::as_Klass(mirror);
1324 jboolean result = k->is_interface();
1325 assert(!result || k->oop_is_instance(),
1326 "all interfaces are instance types");
1327 // The compiler intrinsic for isInterface tests the
1328 // Klass::_access_flags bits in the same way.
1329 return result;
1330 JVM_END
1331
1332
1333 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1334 JVMWrapper("JVM_GetClassSigners");
1335 JvmtiVMObjectAllocEventCollector oam;
1336 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1337 // There are no signers for primitive types
1338 return NULL;
1339 }
1340
1341 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1342
1343 // If there are no signers set in the class, or if the class
1344 // is an array, return NULL.
1345 if (signers == NULL) return NULL;
1346
1347 // copy of the signers array
1348 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1349 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1350 for (int index = 0; index < signers->length(); index++) {
1351 signers_copy->obj_at_put(index, signers->obj_at(index));
1352 }
1353
1354 // return the copy
1355 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1356 JVM_END
1357
1358
1359 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1360 JVMWrapper("JVM_SetClassSigners");
1361 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1362 // This call is ignored for primitive types and arrays.
1363 // Signers are only set once, ClassLoader.java, and thus shouldn't
1364 // be called with an array. Only the bootstrap loader creates arrays.
1365 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1366 if (k->oop_is_instance()) {
1367 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1368 }
1369 }
1370 JVM_END
1371
1372
1373 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1374 JVMWrapper("JVM_GetProtectionDomain");
1375 if (JNIHandles::resolve(cls) == NULL) {
1376 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1377 }
1378
1379 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1380 // Primitive types does not have a protection domain.
1381 return NULL;
1382 }
1383
1384 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1385 return (jobject) JNIHandles::make_local(env, pd);
1386 JVM_END
1387
1388
1389 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1390 // If there is a security manager and protection domain, check the access
1391 // in the protection domain, otherwise it is authorized.
1392 if (java_lang_System::has_security_manager()) {
1393
1394 // For bootstrapping, if pd implies method isn't in the JDK, allow
1395 // this context to revert to older behavior.
1396 // In this case the isAuthorized field in AccessControlContext is also not
1397 // present.
1398 if (Universe::protection_domain_implies_method() == NULL) {
1399 return true;
1400 }
1401
1402 // Whitelist certain access control contexts
1403 if (java_security_AccessControlContext::is_authorized(context)) {
1404 return true;
1405 }
1406
1407 oop prot = klass->protection_domain();
1408 if (prot != NULL) {
1409 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1410 // in the new wrapper.
1411 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1412 Handle h_prot(THREAD, prot);
1413 JavaValue result(T_BOOLEAN);
1414 JavaCallArguments args(h_prot);
1415 JavaCalls::call(&result, m, &args, CHECK_false);
1416 return (result.get_jboolean() != 0);
1417 }
1418 }
1419 return true;
1420 }
1421
1422 // Create an AccessControlContext with a protection domain with null codesource
1423 // and null permissions - which gives no permissions.
1424 oop create_dummy_access_control_context(TRAPS) {
1425 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass());
1426 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1427 // Call constructor ProtectionDomain(null, null);
1428 JavaValue result(T_VOID);
1429 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1430 vmSymbols::object_initializer_name(),
1431 vmSymbols::codesource_permissioncollection_signature(),
1432 Handle(), Handle(), CHECK_NULL);
1433
1434 // new ProtectionDomain[] {pd};
1435 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1436 context->obj_at_put(0, obj());
1437
1438 // new AccessControlContext(new ProtectionDomain[] {pd})
1439 objArrayHandle h_context(THREAD, context);
1440 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1441 return acc;
1442 }
1443
1444 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1445 JVMWrapper("JVM_DoPrivileged");
1446
1447 if (action == NULL) {
1448 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1449 }
1450
1451 // Compute the frame initiating the do privileged operation and setup the privileged stack
1452 vframeStream vfst(thread);
1453 vfst.security_get_caller_frame(1);
1454
1455 if (vfst.at_end()) {
1456 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1457 }
1458
1459 Method* method = vfst.method();
1460 instanceKlassHandle klass (THREAD, method->method_holder());
1461
1462 // Check that action object understands "Object run()"
1463 Handle h_context;
1464 if (context != NULL) {
1465 h_context = Handle(THREAD, JNIHandles::resolve(context));
1466 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1467 if (!authorized) {
1468 // Create an unprivileged access control object and call it's run function
1469 // instead.
1470 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1471 h_context = Handle(THREAD, noprivs);
1472 }
1473 }
1474
1475 // Check that action object understands "Object run()"
1476 Handle object (THREAD, JNIHandles::resolve(action));
1477
1478 // get run() method
1479 Method* m_oop = object->klass()->uncached_lookup_method(
1480 vmSymbols::run_method_name(),
1481 vmSymbols::void_object_signature(),
1482 Klass::find_overpass);
1483 methodHandle m (THREAD, m_oop);
1484 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1485 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1486 }
1487
1488 // Stack allocated list of privileged stack elements
1489 PrivilegedElement pi;
1490 if (!vfst.at_end()) {
1491 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1492 thread->set_privileged_stack_top(&pi);
1493 }
1494
1495
1496 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1497 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1498 Handle pending_exception;
1499 JavaValue result(T_OBJECT);
1500 JavaCallArguments args(object);
1501 JavaCalls::call(&result, m, &args, THREAD);
1502
1503 // done with action, remove ourselves from the list
1504 if (!vfst.at_end()) {
1505 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1506 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1507 }
1508
1509 if (HAS_PENDING_EXCEPTION) {
1510 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1511 CLEAR_PENDING_EXCEPTION;
1512 // JVMTI has already reported the pending exception
1513 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1514 if (THREAD->is_Java_thread()) {
1515 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1516 }
1517 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1518 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1519 // Throw a java.security.PrivilegedActionException(Exception e) exception
1520 JavaCallArguments args(pending_exception);
1521 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1522 vmSymbols::exception_void_signature(),
1523 &args);
1524 }
1525 }
1526
1527 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1528 return JNIHandles::make_local(env, (oop) result.get_jobject());
1529 JVM_END
1530
1531
1532 // Returns the inherited_access_control_context field of the running thread.
1533 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1534 JVMWrapper("JVM_GetInheritedAccessControlContext");
1535 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1536 return JNIHandles::make_local(env, result);
1537 JVM_END
1538
1539 class RegisterArrayForGC {
1540 private:
1541 JavaThread *_thread;
1542 public:
1543 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1544 _thread = thread;
1545 _thread->register_array_for_gc(array);
1546 }
1547
1548 ~RegisterArrayForGC() {
1549 _thread->register_array_for_gc(NULL);
1550 }
1551 };
1552
1553
1554 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1555 JVMWrapper("JVM_GetStackAccessControlContext");
1556 if (!UsePrivilegedStack) return NULL;
1557
1558 ResourceMark rm(THREAD);
1559 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1560 JvmtiVMObjectAllocEventCollector oam;
1561
1562 // count the protection domains on the execution stack. We collapse
1563 // duplicate consecutive protection domains into a single one, as
1564 // well as stopping when we hit a privileged frame.
1565
1566 // Use vframeStream to iterate through Java frames
1567 vframeStream vfst(thread);
1568
1569 oop previous_protection_domain = NULL;
1570 Handle privileged_context(thread, NULL);
1571 bool is_privileged = false;
1572 oop protection_domain = NULL;
1573
1574 for(; !vfst.at_end(); vfst.next()) {
1575 // get method of frame
1576 Method* method = vfst.method();
1577 intptr_t* frame_id = vfst.frame_id();
1578
1579 // check the privileged frames to see if we have a match
1580 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1581 // this frame is privileged
1582 is_privileged = true;
1583 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1584 protection_domain = thread->privileged_stack_top()->protection_domain();
1585 } else {
1586 protection_domain = method->method_holder()->protection_domain();
1587 }
1588
1589 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1590 local_array->push(protection_domain);
1591 previous_protection_domain = protection_domain;
1592 }
1593
1594 if (is_privileged) break;
1595 }
1596
1597
1598 // either all the domains on the stack were system domains, or
1599 // we had a privileged system domain
1600 if (local_array->is_empty()) {
1601 if (is_privileged && privileged_context.is_null()) return NULL;
1602
1603 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1604 return JNIHandles::make_local(env, result);
1605 }
1606
1607 // the resource area must be registered in case of a gc
1608 RegisterArrayForGC ragc(thread, local_array);
1609 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1610 local_array->length(), CHECK_NULL);
1611 objArrayHandle h_context(thread, context);
1612 for (int index = 0; index < local_array->length(); index++) {
1613 h_context->obj_at_put(index, local_array->at(index));
1614 }
1615
1616 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1617
1618 return JNIHandles::make_local(env, result);
1619 JVM_END
1620
1621
1622 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1623 JVMWrapper("JVM_IsArrayClass");
1624 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1625 return (k != NULL) && k->oop_is_array() ? true : false;
1626 JVM_END
1627
1628
1629 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1630 JVMWrapper("JVM_IsPrimitiveClass");
1631 oop mirror = JNIHandles::resolve_non_null(cls);
1632 return (jboolean) java_lang_Class::is_primitive(mirror);
1633 JVM_END
1634
1635
1636 JVM_ENTRY(jclass, JVM_GetComponentType(JNIEnv *env, jclass cls))
1637 JVMWrapper("JVM_GetComponentType");
1638 oop mirror = JNIHandles::resolve_non_null(cls);
1639 oop result = Reflection::array_component_type(mirror, CHECK_NULL);
1640 return (jclass) JNIHandles::make_local(env, result);
1641 JVM_END
1642
1643
1644 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1645 JVMWrapper("JVM_GetClassModifiers");
1646 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1647 // Primitive type
1648 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1649 }
1650
1651 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1652 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1653 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1654 return k->modifier_flags();
1655 JVM_END
1656
1657
1658 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1659
1660 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1661 JvmtiVMObjectAllocEventCollector oam;
1662 // ofClass is a reference to a java_lang_Class object. The mirror object
1663 // of an InstanceKlass
1664
1665 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1666 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1667 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1668 return (jobjectArray)JNIHandles::make_local(env, result);
1669 }
1670
1671 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1672 InnerClassesIterator iter(k);
1673
1674 if (iter.length() == 0) {
1675 // Neither an inner nor outer class
1676 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1677 return (jobjectArray)JNIHandles::make_local(env, result);
1678 }
1679
1680 // find inner class info
1681 constantPoolHandle cp(thread, k->constants());
1682 int length = iter.length();
1683
1684 // Allocate temp. result array
1685 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1686 objArrayHandle result (THREAD, r);
1687 int members = 0;
1688
1689 for (; !iter.done(); iter.next()) {
1690 int ioff = iter.inner_class_info_index();
1691 int ooff = iter.outer_class_info_index();
1692
1693 if (ioff != 0 && ooff != 0) {
1694 // Check to see if the name matches the class we're looking for
1695 // before attempting to find the class.
1696 if (cp->klass_name_at_matches(k, ooff)) {
1697 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1698 if (outer_klass == k()) {
1699 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1700 instanceKlassHandle inner_klass (THREAD, ik);
1701
1702 // Throws an exception if outer klass has not declared k as
1703 // an inner klass
1704 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1705
1706 result->obj_at_put(members, inner_klass->java_mirror());
1707 members++;
1708 }
1709 }
1710 }
1711 }
1712
1713 if (members != length) {
1714 // Return array of right length
1715 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1716 for(int i = 0; i < members; i++) {
1717 res->obj_at_put(i, result->obj_at(i));
1718 }
1719 return (jobjectArray)JNIHandles::make_local(env, res);
1720 }
1721
1722 return (jobjectArray)JNIHandles::make_local(env, result());
1723 JVM_END
1724
1725
1726 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1727 {
1728 // ofClass is a reference to a java_lang_Class object.
1729 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1730 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1731 return NULL;
1732 }
1733
1734 bool inner_is_member = false;
1735 Klass* outer_klass
1736 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1737 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1738 if (outer_klass == NULL) return NULL; // already a top-level class
1739 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1740 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1741 }
1742 JVM_END
1743
1744 // should be in InstanceKlass.cpp, but is here for historical reasons
1745 Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle k,
1746 bool* inner_is_member,
1747 TRAPS) {
1748 Thread* thread = THREAD;
1749 InnerClassesIterator iter(k);
1750 if (iter.length() == 0) {
1751 // No inner class info => no declaring class
1752 return NULL;
1753 }
1754
1755 constantPoolHandle i_cp(thread, k->constants());
1756
1757 bool found = false;
1758 Klass* ok;
1759 instanceKlassHandle outer_klass;
1760 *inner_is_member = false;
1761
1762 // Find inner_klass attribute
1763 for (; !iter.done() && !found; iter.next()) {
1764 int ioff = iter.inner_class_info_index();
1765 int ooff = iter.outer_class_info_index();
1766 int noff = iter.inner_name_index();
1767 if (ioff != 0) {
1768 // Check to see if the name matches the class we're looking for
1769 // before attempting to find the class.
1770 if (i_cp->klass_name_at_matches(k, ioff)) {
1771 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_NULL);
1772 found = (k() == inner_klass);
1773 if (found && ooff != 0) {
1774 ok = i_cp->klass_at(ooff, CHECK_NULL);
1775 if (!ok->oop_is_instance()) {
1776 // If the outer class is not an instance klass then it cannot have
1777 // declared any inner classes.
1778 ResourceMark rm(THREAD);
1779 Exceptions::fthrow(
1780 THREAD_AND_LOCATION,
1781 vmSymbols::java_lang_IncompatibleClassChangeError(),
1782 "%s and %s disagree on InnerClasses attribute",
1783 ok->external_name(),
1784 k->external_name());
1785 return NULL;
1786 }
1787 outer_klass = instanceKlassHandle(thread, ok);
1788 *inner_is_member = true;
1789 }
1790 }
1791 }
1792 }
1793
1794 if (found && outer_klass.is_null()) {
1795 // It may be anonymous; try for that.
1796 int encl_method_class_idx = k->enclosing_method_class_index();
1797 if (encl_method_class_idx != 0) {
1798 ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
1799 outer_klass = instanceKlassHandle(thread, ok);
1800 *inner_is_member = false;
1801 }
1802 }
1803
1804 // If no inner class attribute found for this class.
1805 if (outer_klass.is_null()) return NULL;
1806
1807 // Throws an exception if outer klass has not declared k as an inner klass
1808 // We need evidence that each klass knows about the other, or else
1809 // the system could allow a spoof of an inner class to gain access rights.
1810 Reflection::check_for_inner_class(outer_klass, k, *inner_is_member, CHECK_NULL);
1811 return outer_klass();
1812 }
1813
1814 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1815 assert (cls != NULL, "illegal class");
1816 JVMWrapper("JVM_GetClassSignature");
1817 JvmtiVMObjectAllocEventCollector oam;
1818 ResourceMark rm(THREAD);
1819 // Return null for arrays and primatives
1820 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1821 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1822 if (k->oop_is_instance()) {
1823 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1824 if (sym == NULL) return NULL;
1825 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1826 return (jstring) JNIHandles::make_local(env, str());
1827 }
1828 }
1829 return NULL;
1830 JVM_END
1831
1832
1833 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1834 assert (cls != NULL, "illegal class");
1835 JVMWrapper("JVM_GetClassAnnotations");
1836
1837 // Return null for arrays and primitives
1838 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1839 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1840 if (k->oop_is_instance()) {
1841 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1842 return (jbyteArray) JNIHandles::make_local(env, a);
1843 }
1844 }
1845 return NULL;
1846 JVM_END
1847
1848
1849 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1850 // some of this code was adapted from from jni_FromReflectedField
1851
1852 oop reflected = JNIHandles::resolve_non_null(field);
1853 oop mirror = java_lang_reflect_Field::clazz(reflected);
1854 Klass* k = java_lang_Class::as_Klass(mirror);
1855 int slot = java_lang_reflect_Field::slot(reflected);
1856 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1857
1858 KlassHandle kh(THREAD, k);
1859 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1860
1861 if (modifiers & JVM_ACC_STATIC) {
1862 // for static fields we only look in the current class
1863 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1864 assert(false, "cannot find static field");
1865 return false;
1866 }
1867 } else {
1868 // for instance fields we start with the current class and work
1869 // our way up through the superclass chain
1870 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1871 assert(false, "cannot find instance field");
1872 return false;
1873 }
1874 }
1875 return true;
1876 }
1877
1878 JVM_ENTRY(jbyteArray, JVM_GetFieldAnnotations(JNIEnv *env, jobject field))
1879 // field is a handle to a java.lang.reflect.Field object
1880 assert(field != NULL, "illegal field");
1881 JVMWrapper("JVM_GetFieldAnnotations");
1882
1883 fieldDescriptor fd;
1884 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1885 if (!gotFd) {
1886 return NULL;
1887 }
1888
1889 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.annotations(), THREAD));
1890 JVM_END
1891
1892
1893 static Method* jvm_get_method_common(jobject method) {
1894 // some of this code was adapted from from jni_FromReflectedMethod
1895
1896 oop reflected = JNIHandles::resolve_non_null(method);
1897 oop mirror = NULL;
1898 int slot = 0;
1899
1900 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1901 mirror = java_lang_reflect_Constructor::clazz(reflected);
1902 slot = java_lang_reflect_Constructor::slot(reflected);
1903 } else {
1904 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1905 "wrong type");
1906 mirror = java_lang_reflect_Method::clazz(reflected);
1907 slot = java_lang_reflect_Method::slot(reflected);
1908 }
1909 Klass* k = java_lang_Class::as_Klass(mirror);
1910
1911 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1912 assert(m != NULL, "cannot find method");
1913 return m; // caller has to deal with NULL in product mode
1914 }
1915
1916
1917 JVM_ENTRY(jbyteArray, JVM_GetMethodAnnotations(JNIEnv *env, jobject method))
1918 JVMWrapper("JVM_GetMethodAnnotations");
1919
1920 // method is a handle to a java.lang.reflect.Method object
1921 Method* m = jvm_get_method_common(method);
1922 if (m == NULL) {
1923 return NULL;
1924 }
1925
1926 return (jbyteArray) JNIHandles::make_local(env,
1927 Annotations::make_java_array(m->annotations(), THREAD));
1928 JVM_END
1929
1930
1931 JVM_ENTRY(jbyteArray, JVM_GetMethodDefaultAnnotationValue(JNIEnv *env, jobject method))
1932 JVMWrapper("JVM_GetMethodDefaultAnnotationValue");
1933
1934 // method is a handle to a java.lang.reflect.Method object
1935 Method* m = jvm_get_method_common(method);
1936 if (m == NULL) {
1937 return NULL;
1938 }
1939
1940 return (jbyteArray) JNIHandles::make_local(env,
1941 Annotations::make_java_array(m->annotation_default(), THREAD));
1942 JVM_END
1943
1944
1945 JVM_ENTRY(jbyteArray, JVM_GetMethodParameterAnnotations(JNIEnv *env, jobject method))
1946 JVMWrapper("JVM_GetMethodParameterAnnotations");
1947
1948 // method is a handle to a java.lang.reflect.Method object
1949 Method* m = jvm_get_method_common(method);
1950 if (m == NULL) {
1951 return NULL;
1952 }
1953
1954 return (jbyteArray) JNIHandles::make_local(env,
1955 Annotations::make_java_array(m->parameter_annotations(), THREAD));
1956 JVM_END
1957
1958 /* Type use annotations support (JDK 1.8) */
1959
1960 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1961 assert (cls != NULL, "illegal class");
1962 JVMWrapper("JVM_GetClassTypeAnnotations");
1963 ResourceMark rm(THREAD);
1964 // Return null for arrays and primitives
1965 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1966 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1967 if (k->oop_is_instance()) {
1968 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1969 if (type_annotations != NULL) {
1970 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1971 return (jbyteArray) JNIHandles::make_local(env, a);
1972 }
1973 }
1974 }
1975 return NULL;
1976 JVM_END
1977
1978 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1979 assert (method != NULL, "illegal method");
1980 JVMWrapper("JVM_GetMethodTypeAnnotations");
1981
1982 // method is a handle to a java.lang.reflect.Method object
1983 Method* m = jvm_get_method_common(method);
1984 if (m == NULL) {
1985 return NULL;
1986 }
1987
1988 AnnotationArray* type_annotations = m->type_annotations();
1989 if (type_annotations != NULL) {
1990 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1991 return (jbyteArray) JNIHandles::make_local(env, a);
1992 }
1993
1994 return NULL;
1995 JVM_END
1996
1997 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1998 assert (field != NULL, "illegal field");
1999 JVMWrapper("JVM_GetFieldTypeAnnotations");
2000
2001 fieldDescriptor fd;
2002 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
2003 if (!gotFd) {
2004 return NULL;
2005 }
2006
2007 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
2008 JVM_END
2009
2010 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
2011 if (!cp->is_within_bounds(index)) {
2012 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
2013 }
2014 }
2015
2016 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
2017 {
2018 JVMWrapper("JVM_GetMethodParameters");
2019 // method is a handle to a java.lang.reflect.Method object
2020 Method* method_ptr = jvm_get_method_common(method);
2021 methodHandle mh (THREAD, method_ptr);
2022 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
2023 const int num_params = mh->method_parameters_length();
2024
2025 if (0 != num_params) {
2026 // make sure all the symbols are properly formatted
2027 for (int i = 0; i < num_params; i++) {
2028 MethodParametersElement* params = mh->method_parameters_start();
2029 int index = params[i].name_cp_index;
2030 bounds_check(mh->constants(), index, CHECK_NULL);
2031
2032 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
2033 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
2034 "Wrong type at constant pool index");
2035 }
2036
2037 }
2038
2039 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
2040 objArrayHandle result (THREAD, result_oop);
2041
2042 for (int i = 0; i < num_params; i++) {
2043 MethodParametersElement* params = mh->method_parameters_start();
2044 // For a 0 index, give a NULL symbol
2045 Symbol* sym = 0 != params[i].name_cp_index ?
2046 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
2047 int flags = params[i].flags;
2048 oop param = Reflection::new_parameter(reflected_method, i, sym,
2049 flags, CHECK_NULL);
2050 result->obj_at_put(i, param);
2051 }
2052 return (jobjectArray)JNIHandles::make_local(env, result());
2053 } else {
2054 return (jobjectArray)NULL;
2055 }
2056 }
2057 JVM_END
2058
2059 // New (JDK 1.4) reflection implementation /////////////////////////////////////
2060
2061 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2062 {
2063 JVMWrapper("JVM_GetClassDeclaredFields");
2064 JvmtiVMObjectAllocEventCollector oam;
2065
2066 // Exclude primitive types and array types
2067 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
2068 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
2069 // Return empty array
2070 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
2071 return (jobjectArray) JNIHandles::make_local(env, res);
2072 }
2073
2074 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
2075 constantPoolHandle cp(THREAD, k->constants());
2076
2077 // Ensure class is linked
2078 k->link_class(CHECK_NULL);
2079
2080 // 4496456 We need to filter out java.lang.Throwable.backtrace
2081 bool skip_backtrace = false;
2082
2083 // Allocate result
2084 int num_fields;
2085
2086 if (publicOnly) {
2087 num_fields = 0;
2088 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
2089 if (fs.access_flags().is_public()) ++num_fields;
2090 }
2091 } else {
2092 num_fields = k->java_fields_count();
2093
2094 if (k() == SystemDictionary::Throwable_klass()) {
2095 num_fields--;
2096 skip_backtrace = true;
2097 }
2098 }
2099
2100 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
2101 objArrayHandle result (THREAD, r);
2102
2103 int out_idx = 0;
2104 fieldDescriptor fd;
2105 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
2106 if (skip_backtrace) {
2107 // 4496456 skip java.lang.Throwable.backtrace
2108 int offset = fs.offset();
2109 if (offset == java_lang_Throwable::get_backtrace_offset()) continue;
2110 }
2111
2112 if (!publicOnly || fs.access_flags().is_public()) {
2113 fd.reinitialize(k(), fs.index());
2114 oop field = Reflection::new_field(&fd, UseNewReflection, CHECK_NULL);
2115 result->obj_at_put(out_idx, field);
2116 ++out_idx;
2117 }
2118 }
2119 assert(out_idx == num_fields, "just checking");
2120 return (jobjectArray) JNIHandles::make_local(env, result());
2121 }
2122 JVM_END
2123
2124 static bool select_method(methodHandle method, bool want_constructor) {
2125 if (want_constructor) {
2126 return (method->is_initializer() && !method->is_static());
2127 } else {
2128 return (!method->is_initializer() && !method->is_overpass());
2129 }
2130 }
2131
2132 static jobjectArray get_class_declared_methods_helper(
2133 JNIEnv *env,
2134 jclass ofClass, jboolean publicOnly,
2135 bool want_constructor,
2136 Klass* klass, TRAPS) {
2137
2138 JvmtiVMObjectAllocEventCollector oam;
2139
2140 // Exclude primitive types and array types
2141 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
2142 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
2143 // Return empty array
2144 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
2145 return (jobjectArray) JNIHandles::make_local(env, res);
2146 }
2147
2148 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
2149
2150 // Ensure class is linked
2151 k->link_class(CHECK_NULL);
2152
2153 Array<Method*>* methods = k->methods();
2154 int methods_length = methods->length();
2155
2156 // Save original method_idnum in case of redefinition, which can change
2157 // the idnum of obsolete methods. The new method will have the same idnum
2158 // but if we refresh the methods array, the counts will be wrong.
2159 ResourceMark rm(THREAD);
2160 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
2161 int num_methods = 0;
2162
2163 for (int i = 0; i < methods_length; i++) {
2164 methodHandle method(THREAD, methods->at(i));
2165 if (select_method(method, want_constructor)) {
2166 if (!publicOnly || method->is_public()) {
2167 idnums->push(method->method_idnum());
2168 ++num_methods;
2169 }
2170 }
2171 }
2172
2173 // Allocate result
2174 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
2175 objArrayHandle result (THREAD, r);
2176
2177 // Now just put the methods that we selected above, but go by their idnum
2178 // in case of redefinition. The methods can be redefined at any safepoint,
2179 // so above when allocating the oop array and below when creating reflect
2180 // objects.
2181 for (int i = 0; i < num_methods; i++) {
2182 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
2183 if (method.is_null()) {
2184 // Method may have been deleted and seems this API can handle null
2185 // Otherwise should probably put a method that throws NSME
2186 result->obj_at_put(i, NULL);
2187 } else {
2188 oop m;
2189 if (want_constructor) {
2190 m = Reflection::new_constructor(method, CHECK_NULL);
2191 } else {
2192 m = Reflection::new_method(method, UseNewReflection, false, CHECK_NULL);
2193 }
2194 result->obj_at_put(i, m);
2195 }
2196 }
2197
2198 return (jobjectArray) JNIHandles::make_local(env, result());
2199 }
2200
2201 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2202 {
2203 JVMWrapper("JVM_GetClassDeclaredMethods");
2204 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2205 /*want_constructor*/ false,
2206 SystemDictionary::reflect_Method_klass(), THREAD);
2207 }
2208 JVM_END
2209
2210 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2211 {
2212 JVMWrapper("JVM_GetClassDeclaredConstructors");
2213 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2214 /*want_constructor*/ true,
2215 SystemDictionary::reflect_Constructor_klass(), THREAD);
2216 }
2217 JVM_END
2218
2219 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
2220 {
2221 JVMWrapper("JVM_GetClassAccessFlags");
2222 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2223 // Primitive type
2224 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
2225 }
2226
2227 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2228 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
2229 }
2230 JVM_END
2231
2232
2233 // Constant pool access //////////////////////////////////////////////////////////
2234
2235 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2236 {
2237 JVMWrapper("JVM_GetClassConstantPool");
2238 JvmtiVMObjectAllocEventCollector oam;
2239
2240 // Return null for primitives and arrays
2241 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2242 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2243 if (k->oop_is_instance()) {
2244 instanceKlassHandle k_h(THREAD, k);
2245 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL);
2246 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2247 return JNIHandles::make_local(jcp());
2248 }
2249 }
2250 return NULL;
2251 }
2252 JVM_END
2253
2254
2255 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2256 {
2257 JVMWrapper("JVM_ConstantPoolGetSize");
2258 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2259 return cp->length();
2260 }
2261 JVM_END
2262
2263
2264 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2265 {
2266 JVMWrapper("JVM_ConstantPoolGetClassAt");
2267 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2268 bounds_check(cp, index, CHECK_NULL);
2269 constantTag tag = cp->tag_at(index);
2270 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2271 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2272 }
2273 Klass* k = cp->klass_at(index, CHECK_NULL);
2274 return (jclass) JNIHandles::make_local(k->java_mirror());
2275 }
2276 JVM_END
2277
2278 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2279 {
2280 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2281 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2282 bounds_check(cp, index, CHECK_NULL);
2283 constantTag tag = cp->tag_at(index);
2284 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2285 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2286 }
2287 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2288 if (k == NULL) return NULL;
2289 return (jclass) JNIHandles::make_local(k->java_mirror());
2290 }
2291 JVM_END
2292
2293 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2294 constantTag tag = cp->tag_at(index);
2295 if (!tag.is_method() && !tag.is_interface_method()) {
2296 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2297 }
2298 int klass_ref = cp->uncached_klass_ref_index_at(index);
2299 Klass* k_o;
2300 if (force_resolution) {
2301 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2302 } else {
2303 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2304 if (k_o == NULL) return NULL;
2305 }
2306 instanceKlassHandle k(THREAD, k_o);
2307 Symbol* name = cp->uncached_name_ref_at(index);
2308 Symbol* sig = cp->uncached_signature_ref_at(index);
2309 methodHandle m (THREAD, k->find_method(name, sig));
2310 if (m.is_null()) {
2311 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2312 }
2313 oop method;
2314 if (!m->is_initializer() || m->is_static()) {
2315 method = Reflection::new_method(m, true, true, CHECK_NULL);
2316 } else {
2317 method = Reflection::new_constructor(m, CHECK_NULL);
2318 }
2319 return JNIHandles::make_local(method);
2320 }
2321
2322 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2323 {
2324 JVMWrapper("JVM_ConstantPoolGetMethodAt");
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, true, CHECK_NULL);
2329 return res;
2330 }
2331 JVM_END
2332
2333 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2334 {
2335 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2336 JvmtiVMObjectAllocEventCollector oam;
2337 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2338 bounds_check(cp, index, CHECK_NULL);
2339 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2340 return res;
2341 }
2342 JVM_END
2343
2344 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2345 constantTag tag = cp->tag_at(index);
2346 if (!tag.is_field()) {
2347 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2348 }
2349 int klass_ref = cp->uncached_klass_ref_index_at(index);
2350 Klass* k_o;
2351 if (force_resolution) {
2352 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2353 } else {
2354 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2355 if (k_o == NULL) return NULL;
2356 }
2357 instanceKlassHandle k(THREAD, k_o);
2358 Symbol* name = cp->uncached_name_ref_at(index);
2359 Symbol* sig = cp->uncached_signature_ref_at(index);
2360 fieldDescriptor fd;
2361 Klass* target_klass = k->find_field(name, sig, &fd);
2362 if (target_klass == NULL) {
2363 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2364 }
2365 oop field = Reflection::new_field(&fd, true, CHECK_NULL);
2366 return JNIHandles::make_local(field);
2367 }
2368
2369 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2370 {
2371 JVMWrapper("JVM_ConstantPoolGetFieldAt");
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, true, CHECK_NULL);
2376 return res;
2377 }
2378 JVM_END
2379
2380 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2381 {
2382 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
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 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2387 return res;
2388 }
2389 JVM_END
2390
2391 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2392 {
2393 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2394 JvmtiVMObjectAllocEventCollector oam;
2395 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2396 bounds_check(cp, index, CHECK_NULL);
2397 constantTag tag = cp->tag_at(index);
2398 if (!tag.is_field_or_method()) {
2399 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2400 }
2401 int klass_ref = cp->uncached_klass_ref_index_at(index);
2402 Symbol* klass_name = cp->klass_name_at(klass_ref);
2403 Symbol* member_name = cp->uncached_name_ref_at(index);
2404 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2405 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2406 objArrayHandle dest(THREAD, dest_o);
2407 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2408 dest->obj_at_put(0, str());
2409 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2410 dest->obj_at_put(1, str());
2411 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2412 dest->obj_at_put(2, str());
2413 return (jobjectArray) JNIHandles::make_local(dest());
2414 }
2415 JVM_END
2416
2417 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2418 {
2419 JVMWrapper("JVM_ConstantPoolGetIntAt");
2420 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2421 bounds_check(cp, index, CHECK_0);
2422 constantTag tag = cp->tag_at(index);
2423 if (!tag.is_int()) {
2424 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2425 }
2426 return cp->int_at(index);
2427 }
2428 JVM_END
2429
2430 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2431 {
2432 JVMWrapper("JVM_ConstantPoolGetLongAt");
2433 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2434 bounds_check(cp, index, CHECK_(0L));
2435 constantTag tag = cp->tag_at(index);
2436 if (!tag.is_long()) {
2437 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2438 }
2439 return cp->long_at(index);
2440 }
2441 JVM_END
2442
2443 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2444 {
2445 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2446 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2447 bounds_check(cp, index, CHECK_(0.0f));
2448 constantTag tag = cp->tag_at(index);
2449 if (!tag.is_float()) {
2450 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2451 }
2452 return cp->float_at(index);
2453 }
2454 JVM_END
2455
2456 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2457 {
2458 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2459 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2460 bounds_check(cp, index, CHECK_(0.0));
2461 constantTag tag = cp->tag_at(index);
2462 if (!tag.is_double()) {
2463 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2464 }
2465 return cp->double_at(index);
2466 }
2467 JVM_END
2468
2469 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2470 {
2471 JVMWrapper("JVM_ConstantPoolGetStringAt");
2472 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2473 bounds_check(cp, index, CHECK_NULL);
2474 constantTag tag = cp->tag_at(index);
2475 if (!tag.is_string()) {
2476 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2477 }
2478 oop str = cp->string_at(index, CHECK_NULL);
2479 return (jstring) JNIHandles::make_local(str);
2480 }
2481 JVM_END
2482
2483 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2484 {
2485 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2486 JvmtiVMObjectAllocEventCollector oam;
2487 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2488 bounds_check(cp, index, CHECK_NULL);
2489 constantTag tag = cp->tag_at(index);
2490 if (!tag.is_symbol()) {
2491 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2492 }
2493 Symbol* sym = cp->symbol_at(index);
2494 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2495 return (jstring) JNIHandles::make_local(str());
2496 }
2497 JVM_END
2498
2499
2500 // Assertion support. //////////////////////////////////////////////////////////
2501
2502 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2503 JVMWrapper("JVM_DesiredAssertionStatus");
2504 assert(cls != NULL, "bad class");
2505
2506 oop r = JNIHandles::resolve(cls);
2507 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2508 if (java_lang_Class::is_primitive(r)) return false;
2509
2510 Klass* k = java_lang_Class::as_Klass(r);
2511 assert(k->oop_is_instance(), "must be an instance klass");
2512 if (! k->oop_is_instance()) return false;
2513
2514 ResourceMark rm(THREAD);
2515 const char* name = k->name()->as_C_string();
2516 bool system_class = k->class_loader() == NULL;
2517 return JavaAssertions::enabled(name, system_class);
2518
2519 JVM_END
2520
2521
2522 // Return a new AssertionStatusDirectives object with the fields filled in with
2523 // command-line assertion arguments (i.e., -ea, -da).
2524 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2525 JVMWrapper("JVM_AssertionStatusDirectives");
2526 JvmtiVMObjectAllocEventCollector oam;
2527 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2528 return JNIHandles::make_local(env, asd);
2529 JVM_END
2530
2531 // Verification ////////////////////////////////////////////////////////////////////////////////
2532
2533 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2534
2535 // RedefineClasses support: bug 6214132 caused verification to fail.
2536 // All functions from this section should call the jvmtiThreadSate function:
2537 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2538 // The function returns a Klass* of the _scratch_class if the verifier
2539 // was invoked in the middle of the class redefinition.
2540 // Otherwise it returns its argument value which is the _the_class Klass*.
2541 // Please, refer to the description in the jvmtiThreadSate.hpp.
2542
2543 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2544 JVMWrapper("JVM_GetClassNameUTF");
2545 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2546 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2547 return k->name()->as_utf8();
2548 JVM_END
2549
2550
2551 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2552 JVMWrapper("JVM_GetClassCPTypes");
2553 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2554 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2555 // types will have length zero if this is not an InstanceKlass
2556 // (length is determined by call to JVM_GetClassCPEntriesCount)
2557 if (k->oop_is_instance()) {
2558 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2559 for (int index = cp->length() - 1; index >= 0; index--) {
2560 constantTag tag = cp->tag_at(index);
2561 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2562 }
2563 }
2564 JVM_END
2565
2566
2567 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2568 JVMWrapper("JVM_GetClassCPEntriesCount");
2569 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2570 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2571 if (!k->oop_is_instance())
2572 return 0;
2573 return InstanceKlass::cast(k)->constants()->length();
2574 JVM_END
2575
2576
2577 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2578 JVMWrapper("JVM_GetClassFieldsCount");
2579 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2580 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2581 if (!k->oop_is_instance())
2582 return 0;
2583 return InstanceKlass::cast(k)->java_fields_count();
2584 JVM_END
2585
2586
2587 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2588 JVMWrapper("JVM_GetClassMethodsCount");
2589 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2590 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2591 if (!k->oop_is_instance())
2592 return 0;
2593 return InstanceKlass::cast(k)->methods()->length();
2594 JVM_END
2595
2596
2597 // The following methods, used for the verifier, are never called with
2598 // array klasses, so a direct cast to InstanceKlass is safe.
2599 // Typically, these methods are called in a loop with bounds determined
2600 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2601 // zero for arrays.
2602 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2603 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2604 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2605 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2606 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2607 int length = method->checked_exceptions_length();
2608 if (length > 0) {
2609 CheckedExceptionElement* table= method->checked_exceptions_start();
2610 for (int i = 0; i < length; i++) {
2611 exceptions[i] = table[i].class_cp_index;
2612 }
2613 }
2614 JVM_END
2615
2616
2617 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2618 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2619 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2620 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2621 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2622 return method->checked_exceptions_length();
2623 JVM_END
2624
2625
2626 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2627 JVMWrapper("JVM_GetMethodIxByteCode");
2628 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2629 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2630 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2631 memcpy(code, method->code_base(), method->code_size());
2632 JVM_END
2633
2634
2635 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2636 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2637 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2638 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2639 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2640 return method->code_size();
2641 JVM_END
2642
2643
2644 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2645 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2646 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2647 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2648 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2649 ExceptionTable extable(method);
2650 entry->start_pc = extable.start_pc(entry_index);
2651 entry->end_pc = extable.end_pc(entry_index);
2652 entry->handler_pc = extable.handler_pc(entry_index);
2653 entry->catchType = extable.catch_type_index(entry_index);
2654 JVM_END
2655
2656
2657 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2658 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2659 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2660 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2661 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2662 return method->exception_table_length();
2663 JVM_END
2664
2665
2666 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2667 JVMWrapper("JVM_GetMethodIxModifiers");
2668 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2669 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2670 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2671 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2672 JVM_END
2673
2674
2675 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2676 JVMWrapper("JVM_GetFieldIxModifiers");
2677 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2678 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2679 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2680 JVM_END
2681
2682
2683 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2684 JVMWrapper("JVM_GetMethodIxLocalsCount");
2685 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2686 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2687 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2688 return method->max_locals();
2689 JVM_END
2690
2691
2692 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2693 JVMWrapper("JVM_GetMethodIxArgsSize");
2694 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2695 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2696 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2697 return method->size_of_parameters();
2698 JVM_END
2699
2700
2701 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2702 JVMWrapper("JVM_GetMethodIxMaxStack");
2703 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2704 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2705 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2706 return method->verifier_max_stack();
2707 JVM_END
2708
2709
2710 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2711 JVMWrapper("JVM_IsConstructorIx");
2712 ResourceMark rm(THREAD);
2713 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2714 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2715 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2716 return method->name() == vmSymbols::object_initializer_name();
2717 JVM_END
2718
2719
2720 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2721 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2722 ResourceMark rm(THREAD);
2723 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2724 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2725 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2726 return method->is_overpass();
2727 JVM_END
2728
2729 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2730 JVMWrapper("JVM_GetMethodIxIxUTF");
2731 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2732 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2733 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2734 return method->name()->as_utf8();
2735 JVM_END
2736
2737
2738 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2739 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2740 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2741 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2742 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2743 return method->signature()->as_utf8();
2744 JVM_END
2745
2746 /**
2747 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2748 * read entries in the constant pool. Since the old verifier always
2749 * works on a copy of the code, it will not see any rewriting that
2750 * may possibly occur in the middle of verification. So it is important
2751 * that nothing it calls tries to use the cpCache instead of the raw
2752 * constant pool, so we must use cp->uncached_x methods when appropriate.
2753 */
2754 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2755 JVMWrapper("JVM_GetCPFieldNameUTF");
2756 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2757 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2758 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2759 switch (cp->tag_at(cp_index).value()) {
2760 case JVM_CONSTANT_Fieldref:
2761 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2762 default:
2763 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2764 }
2765 ShouldNotReachHere();
2766 return NULL;
2767 JVM_END
2768
2769
2770 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2771 JVMWrapper("JVM_GetCPMethodNameUTF");
2772 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2773 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2774 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2775 switch (cp->tag_at(cp_index).value()) {
2776 case JVM_CONSTANT_InterfaceMethodref:
2777 case JVM_CONSTANT_Methodref:
2778 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2779 default:
2780 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2781 }
2782 ShouldNotReachHere();
2783 return NULL;
2784 JVM_END
2785
2786
2787 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2788 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2789 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2790 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2791 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2792 switch (cp->tag_at(cp_index).value()) {
2793 case JVM_CONSTANT_InterfaceMethodref:
2794 case JVM_CONSTANT_Methodref:
2795 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2796 default:
2797 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2798 }
2799 ShouldNotReachHere();
2800 return NULL;
2801 JVM_END
2802
2803
2804 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2805 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2806 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2807 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2808 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2809 switch (cp->tag_at(cp_index).value()) {
2810 case JVM_CONSTANT_Fieldref:
2811 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2812 default:
2813 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2814 }
2815 ShouldNotReachHere();
2816 return NULL;
2817 JVM_END
2818
2819
2820 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2821 JVMWrapper("JVM_GetCPClassNameUTF");
2822 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2823 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2824 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2825 Symbol* classname = cp->klass_name_at(cp_index);
2826 return classname->as_utf8();
2827 JVM_END
2828
2829
2830 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2831 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2832 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2833 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2834 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2835 switch (cp->tag_at(cp_index).value()) {
2836 case JVM_CONSTANT_Fieldref: {
2837 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2838 Symbol* classname = cp->klass_name_at(class_index);
2839 return classname->as_utf8();
2840 }
2841 default:
2842 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2843 }
2844 ShouldNotReachHere();
2845 return NULL;
2846 JVM_END
2847
2848
2849 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2850 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2851 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2852 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2853 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2854 switch (cp->tag_at(cp_index).value()) {
2855 case JVM_CONSTANT_Methodref:
2856 case JVM_CONSTANT_InterfaceMethodref: {
2857 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2858 Symbol* classname = cp->klass_name_at(class_index);
2859 return classname->as_utf8();
2860 }
2861 default:
2862 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2863 }
2864 ShouldNotReachHere();
2865 return NULL;
2866 JVM_END
2867
2868
2869 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2870 JVMWrapper("JVM_GetCPFieldModifiers");
2871 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2872 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2873 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2874 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2875 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2876 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2877 switch (cp->tag_at(cp_index).value()) {
2878 case JVM_CONSTANT_Fieldref: {
2879 Symbol* name = cp->uncached_name_ref_at(cp_index);
2880 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2881 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2882 if (fs.name() == name && fs.signature() == signature) {
2883 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2884 }
2885 }
2886 return -1;
2887 }
2888 default:
2889 fatal("JVM_GetCPFieldModifiers: illegal constant");
2890 }
2891 ShouldNotReachHere();
2892 return 0;
2893 JVM_END
2894
2895
2896 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2897 JVMWrapper("JVM_GetCPMethodModifiers");
2898 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2899 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2900 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2901 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2902 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2903 switch (cp->tag_at(cp_index).value()) {
2904 case JVM_CONSTANT_Methodref:
2905 case JVM_CONSTANT_InterfaceMethodref: {
2906 Symbol* name = cp->uncached_name_ref_at(cp_index);
2907 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2908 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2909 int methods_count = methods->length();
2910 for (int i = 0; i < methods_count; i++) {
2911 Method* method = methods->at(i);
2912 if (method->name() == name && method->signature() == signature) {
2913 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2914 }
2915 }
2916 return -1;
2917 }
2918 default:
2919 fatal("JVM_GetCPMethodModifiers: illegal constant");
2920 }
2921 ShouldNotReachHere();
2922 return 0;
2923 JVM_END
2924
2925
2926 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2927
2928 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2929 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2930 JVM_END
2931
2932
2933 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2934 JVMWrapper("JVM_IsSameClassPackage");
2935 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2936 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2937 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2938 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2939 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2940 JVM_END
2941
2942
2943 // IO functions ////////////////////////////////////////////////////////////////////////////////////////
2944
2945 JVM_LEAF(jint, JVM_Open(const char *fname, jint flags, jint mode))
2946 JVMWrapper2("JVM_Open (%s)", fname);
2947
2948 //%note jvm_r6
2949 int result = os::open(fname, flags, mode);
2950 if (result >= 0) {
2951 return result;
2952 } else {
2953 switch(errno) {
2954 case EEXIST:
2955 return JVM_EEXIST;
2956 default:
2957 return -1;
2958 }
2959 }
2960 JVM_END
2961
2962
2963 JVM_LEAF(jint, JVM_Close(jint fd))
2964 JVMWrapper2("JVM_Close (0x%x)", fd);
2965 //%note jvm_r6
2966 return os::close(fd);
2967 JVM_END
2968
2969
2970 JVM_LEAF(jint, JVM_Read(jint fd, char *buf, jint nbytes))
2971 JVMWrapper2("JVM_Read (0x%x)", fd);
2972
2973 //%note jvm_r6
2974 return (jint)os::restartable_read(fd, buf, nbytes);
2975 JVM_END
2976
2977
2978 JVM_LEAF(jint, JVM_Write(jint fd, char *buf, jint nbytes))
2979 JVMWrapper2("JVM_Write (0x%x)", fd);
2980
2981 //%note jvm_r6
2982 return (jint)os::write(fd, buf, nbytes);
2983 JVM_END
2984
2985
2986 JVM_LEAF(jint, JVM_Available(jint fd, jlong *pbytes))
2987 JVMWrapper2("JVM_Available (0x%x)", fd);
2988 //%note jvm_r6
2989 return os::available(fd, pbytes);
2990 JVM_END
2991
2992
2993 JVM_LEAF(jlong, JVM_Lseek(jint fd, jlong offset, jint whence))
2994 JVMWrapper4("JVM_Lseek (0x%x, " INT64_FORMAT ", %d)", fd, (int64_t) offset, whence);
2995 //%note jvm_r6
2996 return os::lseek(fd, offset, whence);
2997 JVM_END
2998
2999
3000 JVM_LEAF(jint, JVM_SetLength(jint fd, jlong length))
3001 JVMWrapper3("JVM_SetLength (0x%x, " INT64_FORMAT ")", fd, (int64_t) length);
3002 return os::ftruncate(fd, length);
3003 JVM_END
3004
3005
3006 JVM_LEAF(jint, JVM_Sync(jint fd))
3007 JVMWrapper2("JVM_Sync (0x%x)", fd);
3008 //%note jvm_r6
3009 return os::fsync(fd);
3010 JVM_END
3011
3012
3013 // Printing support //////////////////////////////////////////////////
3014 extern "C" {
3015
3016 ATTRIBUTE_PRINTF(3, 0)
3017 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
3018 // Reject count values that are negative signed values converted to
3019 // unsigned; see bug 4399518, 4417214
3020 if ((intptr_t)count <= 0) return -1;
3021
3022 int result = os::vsnprintf(str, count, fmt, args);
3023 if (result > 0 && (size_t)result >= count) {
3024 result = -1;
3025 }
3026
3027 return result;
3028 }
3029
3030 ATTRIBUTE_PRINTF(3, 0)
3031 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
3032 va_list args;
3033 int len;
3034 va_start(args, fmt);
3035 len = jio_vsnprintf(str, count, fmt, args);
3036 va_end(args);
3037 return len;
3038 }
3039
3040 ATTRIBUTE_PRINTF(2,3)
3041 int jio_fprintf(FILE* f, const char *fmt, ...) {
3042 int len;
3043 va_list args;
3044 va_start(args, fmt);
3045 len = jio_vfprintf(f, fmt, args);
3046 va_end(args);
3047 return len;
3048 }
3049
3050 ATTRIBUTE_PRINTF(2, 0)
3051 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
3052 if (Arguments::vfprintf_hook() != NULL) {
3053 return Arguments::vfprintf_hook()(f, fmt, args);
3054 } else {
3055 return vfprintf(f, fmt, args);
3056 }
3057 }
3058
3059 ATTRIBUTE_PRINTF(1, 2)
3060 JNIEXPORT int jio_printf(const char *fmt, ...) {
3061 int len;
3062 va_list args;
3063 va_start(args, fmt);
3064 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
3065 va_end(args);
3066 return len;
3067 }
3068
3069
3070 // HotSpot specific jio method
3071 void jio_print(const char* s) {
3072 // Try to make this function as atomic as possible.
3073 if (Arguments::vfprintf_hook() != NULL) {
3074 jio_fprintf(defaultStream::output_stream(), "%s", s);
3075 } else {
3076 // Make an unused local variable to avoid warning from gcc 4.x compiler.
3077 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
3078 }
3079 }
3080
3081 } // Extern C
3082
3083 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
3084
3085 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
3086 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
3087 // OSThread objects. The exception to this rule is when the target object is the thread
3088 // doing the operation, in which case we know that the thread won't exit until the
3089 // operation is done (all exits being voluntary). There are a few cases where it is
3090 // rather silly to do operations on yourself, like resuming yourself or asking whether
3091 // you are alive. While these can still happen, they are not subject to deadlocks if
3092 // the lock is held while the operation occurs (this is not the case for suspend, for
3093 // instance), and are very unlikely. Because IsAlive needs to be fast and its
3094 // implementation is local to this file, we always lock Threads_lock for that one.
3095
3096 static void thread_entry(JavaThread* thread, TRAPS) {
3097 HandleMark hm(THREAD);
3098 Handle obj(THREAD, thread->threadObj());
3099 JavaValue result(T_VOID);
3100 JavaCalls::call_virtual(&result,
3101 obj,
3102 KlassHandle(THREAD, SystemDictionary::Thread_klass()),
3103 vmSymbols::run_method_name(),
3104 vmSymbols::void_method_signature(),
3105 THREAD);
3106 }
3107
3108
3109 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3110 JVMWrapper("JVM_StartThread");
3111 JavaThread *native_thread = NULL;
3112
3113 // We cannot hold the Threads_lock when we throw an exception,
3114 // due to rank ordering issues. Example: we might need to grab the
3115 // Heap_lock while we construct the exception.
3116 bool throw_illegal_thread_state = false;
3117
3118 // We must release the Threads_lock before we can post a jvmti event
3119 // in Thread::start.
3120 {
3121 // Ensure that the C++ Thread and OSThread structures aren't freed before
3122 // we operate.
3123 MutexLocker mu(Threads_lock);
3124
3125 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3126 // re-starting an already started thread, so we should usually find
3127 // that the JavaThread is null. However for a JNI attached thread
3128 // there is a small window between the Thread object being created
3129 // (with its JavaThread set) and the update to its threadStatus, so we
3130 // have to check for this
3131 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
3132 throw_illegal_thread_state = true;
3133 } else {
3134 // We could also check the stillborn flag to see if this thread was already stopped, but
3135 // for historical reasons we let the thread detect that itself when it starts running
3136
3137 jlong size =
3138 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3139 // Allocate the C++ Thread structure and create the native thread. The
3140 // stack size retrieved from java is signed, but the constructor takes
3141 // size_t (an unsigned type), so avoid passing negative values which would
3142 // result in really large stacks.
3143 size_t sz = size > 0 ? (size_t) size : 0;
3144 native_thread = new JavaThread(&thread_entry, sz);
3145
3146 // At this point it may be possible that no osthread was created for the
3147 // JavaThread due to lack of memory. Check for this situation and throw
3148 // an exception if necessary. Eventually we may want to change this so
3149 // that we only grab the lock if the thread was created successfully -
3150 // then we can also do this check and throw the exception in the
3151 // JavaThread constructor.
3152 if (native_thread->osthread() != NULL) {
3153 // Note: the current thread is not being used within "prepare".
3154 native_thread->prepare(jthread);
3155 }
3156 }
3157 }
3158
3159 if (throw_illegal_thread_state) {
3160 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3161 }
3162
3163 assert(native_thread != NULL, "Starting null thread?");
3164
3165 if (native_thread->osthread() == NULL) {
3166 // No one should hold a reference to the 'native_thread'.
3167 delete native_thread;
3168 if (JvmtiExport::should_post_resource_exhausted()) {
3169 JvmtiExport::post_resource_exhausted(
3170 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3171 "unable to create new native thread");
3172 }
3173 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3174 "unable to create new native thread");
3175 }
3176
3177 Thread::start(native_thread);
3178
3179 JVM_END
3180
3181 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3182 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
3183 // but is thought to be reliable and simple. In the case, where the receiver is the
3184 // same thread as the sender, no safepoint is needed.
3185 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3186 JVMWrapper("JVM_StopThread");
3187
3188 oop java_throwable = JNIHandles::resolve(throwable);
3189 if (java_throwable == NULL) {
3190 THROW(vmSymbols::java_lang_NullPointerException());
3191 }
3192 oop java_thread = JNIHandles::resolve_non_null(jthread);
3193 JavaThread* receiver = java_lang_Thread::thread(java_thread);
3194 Events::log_exception(JavaThread::current(),
3195 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3196 p2i(receiver), p2i((address)java_thread), p2i(throwable));
3197 // First check if thread is alive
3198 if (receiver != NULL) {
3199 // Check if exception is getting thrown at self (use oop equality, since the
3200 // target object might exit)
3201 if (java_thread == thread->threadObj()) {
3202 THROW_OOP(java_throwable);
3203 } else {
3204 // Enques a VM_Operation to stop all threads and then deliver the exception...
3205 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
3206 }
3207 }
3208 else {
3209 // Either:
3210 // - target thread has not been started before being stopped, or
3211 // - target thread already terminated
3212 // We could read the threadStatus to determine which case it is
3213 // but that is overkill as it doesn't matter. We must set the
3214 // stillborn flag for the first case, and if the thread has already
3215 // exited setting this flag has no affect
3216 java_lang_Thread::set_stillborn(java_thread);
3217 }
3218 JVM_END
3219
3220
3221 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3222 JVMWrapper("JVM_IsThreadAlive");
3223
3224 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3225 return java_lang_Thread::is_alive(thread_oop);
3226 JVM_END
3227
3228
3229 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3230 JVMWrapper("JVM_SuspendThread");
3231 oop java_thread = JNIHandles::resolve_non_null(jthread);
3232 JavaThread* receiver = java_lang_Thread::thread(java_thread);
3233
3234 if (receiver != NULL) {
3235 // thread has run and has not exited (still on threads list)
3236
3237 {
3238 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3239 if (receiver->is_external_suspend()) {
3240 // Don't allow nested external suspend requests. We can't return
3241 // an error from this interface so just ignore the problem.
3242 return;
3243 }
3244 if (receiver->is_exiting()) { // thread is in the process of exiting
3245 return;
3246 }
3247 receiver->set_external_suspend();
3248 }
3249
3250 // java_suspend() will catch threads in the process of exiting
3251 // and will ignore them.
3252 receiver->java_suspend();
3253
3254 // It would be nice to have the following assertion in all the
3255 // time, but it is possible for a racing resume request to have
3256 // resumed this thread right after we suspended it. Temporarily
3257 // enable this assertion if you are chasing a different kind of
3258 // bug.
3259 //
3260 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3261 // receiver->is_being_ext_suspended(), "thread is not suspended");
3262 }
3263 JVM_END
3264
3265
3266 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3267 JVMWrapper("JVM_ResumeThread");
3268 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
3269 // We need to *always* get the threads lock here, since this operation cannot be allowed during
3270 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3271 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3272 // looks at it.
3273 MutexLocker ml(Threads_lock);
3274 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3275 if (thr != NULL) {
3276 // the thread has run and is not in the process of exiting
3277 thr->java_resume();
3278 }
3279 JVM_END
3280
3281
3282 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3283 JVMWrapper("JVM_SetThreadPriority");
3284 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3285 MutexLocker ml(Threads_lock);
3286 oop java_thread = JNIHandles::resolve_non_null(jthread);
3287 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3288 JavaThread* thr = java_lang_Thread::thread(java_thread);
3289 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
3290 Thread::set_priority(thr, (ThreadPriority)prio);
3291 }
3292 JVM_END
3293
3294
3295 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3296 JVMWrapper("JVM_Yield");
3297 if (os::dont_yield()) return;
3298 #ifndef USDT2
3299 HS_DTRACE_PROBE0(hotspot, thread__yield);
3300 #else /* USDT2 */
3301 HOTSPOT_THREAD_YIELD();
3302 #endif /* USDT2 */
3303 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
3304 // Critical for similar threading behaviour
3305 if (ConvertYieldToSleep) {
3306 os::sleep(thread, MinSleepInterval, false);
3307 } else {
3308 os::yield();
3309 }
3310 JVM_END
3311
3312 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3313 assert(event != NULL, "invariant");
3314 assert(event->should_commit(), "invariant");
3315 event->set_time(millis);
3316 event->commit();
3317 }
3318
3319 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3320 JVMWrapper("JVM_Sleep");
3321
3322 if (millis < 0) {
3323 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3324 }
3325
3326 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3327 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3328 }
3329
3330 // Save current thread state and restore it at the end of this block.
3331 // And set new thread state to SLEEPING.
3332 JavaThreadSleepState jtss(thread);
3333
3334 #ifndef USDT2
3335 HS_DTRACE_PROBE1(hotspot, thread__sleep__begin, millis);
3336 #else /* USDT2 */
3337 HOTSPOT_THREAD_SLEEP_BEGIN(
3338 millis);
3339 #endif /* USDT2 */
3340
3341 EventThreadSleep event;
3342
3343 if (millis == 0) {
3344 // When ConvertSleepToYield is on, this matches the classic VM implementation of
3345 // JVM_Sleep. Critical for similar threading behaviour (Win32)
3346 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
3347 // for SOLARIS
3348 if (ConvertSleepToYield) {
3349 os::yield();
3350 } else {
3351 ThreadState old_state = thread->osthread()->get_state();
3352 thread->osthread()->set_state(SLEEPING);
3353 os::sleep(thread, MinSleepInterval, false);
3354 thread->osthread()->set_state(old_state);
3355 }
3356 } else {
3357 ThreadState old_state = thread->osthread()->get_state();
3358 thread->osthread()->set_state(SLEEPING);
3359 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3360 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3361 // us while we were sleeping. We do not overwrite those.
3362 if (!HAS_PENDING_EXCEPTION) {
3363 if (event.should_commit()) {
3364 post_thread_sleep_event(&event, millis);
3365 }
3366 #ifndef USDT2
3367 HS_DTRACE_PROBE1(hotspot, thread__sleep__end,1);
3368 #else /* USDT2 */
3369 HOTSPOT_THREAD_SLEEP_END(
3370 1);
3371 #endif /* USDT2 */
3372 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3373 // to properly restore the thread state. That's likely wrong.
3374 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3375 }
3376 }
3377 thread->osthread()->set_state(old_state);
3378 }
3379 if (event.should_commit()) {
3380 post_thread_sleep_event(&event, millis);
3381 }
3382 #ifndef USDT2
3383 HS_DTRACE_PROBE1(hotspot, thread__sleep__end,0);
3384 #else /* USDT2 */
3385 HOTSPOT_THREAD_SLEEP_END(
3386 0);
3387 #endif /* USDT2 */
3388 JVM_END
3389
3390 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3391 JVMWrapper("JVM_CurrentThread");
3392 oop jthread = thread->threadObj();
3393 assert (thread != NULL, "no current thread!");
3394 return JNIHandles::make_local(env, jthread);
3395 JVM_END
3396
3397
3398 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3399 JVMWrapper("JVM_CountStackFrames");
3400
3401 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3402 oop java_thread = JNIHandles::resolve_non_null(jthread);
3403 bool throw_illegal_thread_state = false;
3404 int count = 0;
3405
3406 {
3407 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3408 // We need to re-resolve the java_thread, since a GC might have happened during the
3409 // acquire of the lock
3410 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3411
3412 if (thr == NULL) {
3413 // do nothing
3414 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
3415 // Check whether this java thread has been suspended already. If not, throws
3416 // IllegalThreadStateException. We defer to throw that exception until
3417 // Threads_lock is released since loading exception class has to leave VM.
3418 // The correct way to test a thread is actually suspended is
3419 // wait_for_ext_suspend_completion(), but we can't call that while holding
3420 // the Threads_lock. The above tests are sufficient for our purposes
3421 // provided the walkability of the stack is stable - which it isn't
3422 // 100% but close enough for most practical purposes.
3423 throw_illegal_thread_state = true;
3424 } else {
3425 // Count all java activation, i.e., number of vframes
3426 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
3427 // Native frames are not counted
3428 if (!vfst.method()->is_native()) count++;
3429 }
3430 }
3431 }
3432
3433 if (throw_illegal_thread_state) {
3434 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3435 "this thread is not suspended");
3436 }
3437 return count;
3438 JVM_END
3439
3440 // Consider: A better way to implement JVM_Interrupt() is to acquire
3441 // Threads_lock to resolve the jthread into a Thread pointer, fetch
3442 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
3443 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
3444 // outside the critical section. Threads_lock is hot so we want to minimize
3445 // the hold-time. A cleaner interface would be to decompose interrupt into
3446 // two steps. The 1st phase, performed under Threads_lock, would return
3447 // a closure that'd be invoked after Threads_lock was dropped.
3448 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
3449 // admit spurious wakeups.
3450
3451 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3452 JVMWrapper("JVM_Interrupt");
3453
3454 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3455 oop java_thread = JNIHandles::resolve_non_null(jthread);
3456 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3457 // We need to re-resolve the java_thread, since a GC might have happened during the
3458 // acquire of the lock
3459 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3460 if (thr != NULL) {
3461 Thread::interrupt(thr);
3462 }
3463 JVM_END
3464
3465
3466 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3467 JVMWrapper("JVM_IsInterrupted");
3468
3469 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3470 oop java_thread = JNIHandles::resolve_non_null(jthread);
3471 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3472 // We need to re-resolve the java_thread, since a GC might have happened during the
3473 // acquire of the lock
3474 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3475 if (thr == NULL) {
3476 return JNI_FALSE;
3477 } else {
3478 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3479 }
3480 JVM_END
3481
3482
3483 // Return true iff the current thread has locked the object passed in
3484
3485 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3486 JVMWrapper("JVM_HoldsLock");
3487 assert(THREAD->is_Java_thread(), "sanity check");
3488 if (obj == NULL) {
3489 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3490 }
3491 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3492 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3493 JVM_END
3494
3495
3496 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3497 JVMWrapper("JVM_DumpAllStacks");
3498 VM_PrintThreads op;
3499 VMThread::execute(&op);
3500 if (JvmtiExport::should_post_data_dump()) {
3501 JvmtiExport::post_data_dump();
3502 }
3503 JVM_END
3504
3505 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3506 JVMWrapper("JVM_SetNativeThreadName");
3507 ResourceMark rm(THREAD);
3508 oop java_thread = JNIHandles::resolve_non_null(jthread);
3509 JavaThread* thr = java_lang_Thread::thread(java_thread);
3510 // Thread naming only supported for the current thread, doesn't work for
3511 // target threads.
3512 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3513 // we don't set the name of an attached thread to avoid stepping
3514 // on other programs
3515 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3516 os::set_native_thread_name(thread_name);
3517 }
3518 JVM_END
3519
3520 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3521
3522 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3523 assert(jthread->is_Java_thread(), "must be a Java thread");
3524 if (jthread->privileged_stack_top() == NULL) return false;
3525 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3526 oop loader = jthread->privileged_stack_top()->class_loader();
3527 if (loader == NULL) return true;
3528 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3529 if (trusted) return true;
3530 }
3531 return false;
3532 }
3533
3534 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3535 JVMWrapper("JVM_CurrentLoadedClass");
3536 ResourceMark rm(THREAD);
3537
3538 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3539 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3540 bool trusted = is_trusted_frame(thread, &vfst);
3541 if (trusted) return NULL;
3542
3543 Method* m = vfst.method();
3544 if (!m->is_native()) {
3545 InstanceKlass* holder = m->method_holder();
3546 oop loader = holder->class_loader();
3547 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3548 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3549 }
3550 }
3551 }
3552 return NULL;
3553 JVM_END
3554
3555
3556 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3557 JVMWrapper("JVM_CurrentClassLoader");
3558 ResourceMark rm(THREAD);
3559
3560 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3561
3562 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3563 bool trusted = is_trusted_frame(thread, &vfst);
3564 if (trusted) return NULL;
3565
3566 Method* m = vfst.method();
3567 if (!m->is_native()) {
3568 InstanceKlass* holder = m->method_holder();
3569 assert(holder->is_klass(), "just checking");
3570 oop loader = holder->class_loader();
3571 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3572 return JNIHandles::make_local(env, loader);
3573 }
3574 }
3575 }
3576 return NULL;
3577 JVM_END
3578
3579
3580 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3581 JVMWrapper("JVM_GetClassContext");
3582 ResourceMark rm(THREAD);
3583 JvmtiVMObjectAllocEventCollector oam;
3584 vframeStream vfst(thread);
3585
3586 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3587 // This must only be called from SecurityManager.getClassContext
3588 Method* m = vfst.method();
3589 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3590 m->name() == vmSymbols::getClassContext_name() &&
3591 m->signature() == vmSymbols::void_class_array_signature())) {
3592 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3593 }
3594 }
3595
3596 // Collect method holders
3597 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3598 for (; !vfst.at_end(); vfst.security_next()) {
3599 Method* m = vfst.method();
3600 // Native frames are not returned
3601 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3602 Klass* holder = m->method_holder();
3603 assert(holder->is_klass(), "just checking");
3604 klass_array->append(holder);
3605 }
3606 }
3607
3608 // Create result array of type [Ljava/lang/Class;
3609 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3610 // Fill in mirrors corresponding to method holders
3611 for (int i = 0; i < klass_array->length(); i++) {
3612 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3613 }
3614
3615 return (jobjectArray) JNIHandles::make_local(env, result);
3616 JVM_END
3617
3618
3619 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3620 JVMWrapper("JVM_ClassDepth");
3621 ResourceMark rm(THREAD);
3622 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3623 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3624
3625 const char* str = java_lang_String::as_utf8_string(class_name_str());
3626 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3627 if (class_name_sym == NULL) {
3628 return -1;
3629 }
3630
3631 int depth = 0;
3632
3633 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3634 if (!vfst.method()->is_native()) {
3635 InstanceKlass* holder = vfst.method()->method_holder();
3636 assert(holder->is_klass(), "just checking");
3637 if (holder->name() == class_name_sym) {
3638 return depth;
3639 }
3640 depth++;
3641 }
3642 }
3643 return -1;
3644 JVM_END
3645
3646
3647 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3648 JVMWrapper("JVM_ClassLoaderDepth");
3649 ResourceMark rm(THREAD);
3650 int depth = 0;
3651 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3652 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3653 bool trusted = is_trusted_frame(thread, &vfst);
3654 if (trusted) return -1;
3655
3656 Method* m = vfst.method();
3657 if (!m->is_native()) {
3658 InstanceKlass* holder = m->method_holder();
3659 assert(holder->is_klass(), "just checking");
3660 oop loader = holder->class_loader();
3661 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3662 return depth;
3663 }
3664 depth++;
3665 }
3666 }
3667 return -1;
3668 JVM_END
3669
3670
3671 // java.lang.Package ////////////////////////////////////////////////////////////////
3672
3673
3674 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3675 JVMWrapper("JVM_GetSystemPackage");
3676 ResourceMark rm(THREAD);
3677 JvmtiVMObjectAllocEventCollector oam;
3678 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3679 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3680 return (jstring) JNIHandles::make_local(result);
3681 JVM_END
3682
3683
3684 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3685 JVMWrapper("JVM_GetSystemPackages");
3686 JvmtiVMObjectAllocEventCollector oam;
3687 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3688 return (jobjectArray) JNIHandles::make_local(result);
3689 JVM_END
3690
3691
3692 // ObjectInputStream ///////////////////////////////////////////////////////////////
3693
3694 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3695 if (current_class == NULL) {
3696 return true;
3697 }
3698 if ((current_class == field_class) || access.is_public()) {
3699 return true;
3700 }
3701
3702 if (access.is_protected()) {
3703 // See if current_class is a subclass of field_class
3704 if (current_class->is_subclass_of(field_class)) {
3705 return true;
3706 }
3707 }
3708
3709 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3710 }
3711
3712
3713 // JVM_AllocateNewObject and JVM_AllocateNewArray are unused as of 1.4
3714 JVM_ENTRY(jobject, JVM_AllocateNewObject(JNIEnv *env, jobject receiver, jclass currClass, jclass initClass))
3715 JVMWrapper("JVM_AllocateNewObject");
3716 JvmtiVMObjectAllocEventCollector oam;
3717 // Receiver is not used
3718 oop curr_mirror = JNIHandles::resolve_non_null(currClass);
3719 oop init_mirror = JNIHandles::resolve_non_null(initClass);
3720
3721 // Cannot instantiate primitive types
3722 if (java_lang_Class::is_primitive(curr_mirror) || java_lang_Class::is_primitive(init_mirror)) {
3723 ResourceMark rm(THREAD);
3724 THROW_0(vmSymbols::java_lang_InvalidClassException());
3725 }
3726
3727 // Arrays not allowed here, must use JVM_AllocateNewArray
3728 if (java_lang_Class::as_Klass(curr_mirror)->oop_is_array() ||
3729 java_lang_Class::as_Klass(init_mirror)->oop_is_array()) {
3730 ResourceMark rm(THREAD);
3731 THROW_0(vmSymbols::java_lang_InvalidClassException());
3732 }
3733
3734 instanceKlassHandle curr_klass (THREAD, java_lang_Class::as_Klass(curr_mirror));
3735 instanceKlassHandle init_klass (THREAD, java_lang_Class::as_Klass(init_mirror));
3736
3737 assert(curr_klass->is_subclass_of(init_klass()), "just checking");
3738
3739 // Interfaces, abstract classes, and java.lang.Class classes cannot be instantiated directly.
3740 curr_klass->check_valid_for_instantiation(false, CHECK_NULL);
3741
3742 // Make sure klass is initialized, since we are about to instantiate one of them.
3743 curr_klass->initialize(CHECK_NULL);
3744
3745 methodHandle m (THREAD,
3746 init_klass->find_method(vmSymbols::object_initializer_name(),
3747 vmSymbols::void_method_signature()));
3748 if (m.is_null()) {
3749 ResourceMark rm(THREAD);
3750 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(),
3751 Method::name_and_sig_as_C_string(init_klass(),
3752 vmSymbols::object_initializer_name(),
3753 vmSymbols::void_method_signature()));
3754 }
3755
3756 if (curr_klass == init_klass && !m->is_public()) {
3757 // Calling the constructor for class 'curr_klass'.
3758 // Only allow calls to a public no-arg constructor.
3759 // This path corresponds to creating an Externalizable object.
3760 THROW_0(vmSymbols::java_lang_IllegalAccessException());
3761 }
3762
3763 if (!force_verify_field_access(curr_klass(), init_klass(), m->access_flags(), false)) {
3764 // subclass 'curr_klass' does not have access to no-arg constructor of 'initcb'
3765 THROW_0(vmSymbols::java_lang_IllegalAccessException());
3766 }
3767
3768 Handle obj = curr_klass->allocate_instance_handle(CHECK_NULL);
3769 // Call constructor m. This might call a constructor higher up in the hierachy
3770 JavaCalls::call_default_constructor(thread, m, obj, CHECK_NULL);
3771
3772 return JNIHandles::make_local(obj());
3773 JVM_END
3774
3775
3776 JVM_ENTRY(jobject, JVM_AllocateNewArray(JNIEnv *env, jobject obj, jclass currClass, jint length))
3777 JVMWrapper("JVM_AllocateNewArray");
3778 JvmtiVMObjectAllocEventCollector oam;
3779 oop mirror = JNIHandles::resolve_non_null(currClass);
3780
3781 if (java_lang_Class::is_primitive(mirror)) {
3782 THROW_0(vmSymbols::java_lang_InvalidClassException());
3783 }
3784 Klass* k = java_lang_Class::as_Klass(mirror);
3785 oop result;
3786
3787 if (k->oop_is_typeArray()) {
3788 // typeArray
3789 result = TypeArrayKlass::cast(k)->allocate(length, CHECK_NULL);
3790 } else if (k->oop_is_objArray()) {
3791 // objArray
3792 ObjArrayKlass* oak = ObjArrayKlass::cast(k);
3793 oak->initialize(CHECK_NULL); // make sure class is initialized (matches Classic VM behavior)
3794 result = oak->allocate(length, CHECK_NULL);
3795 } else {
3796 THROW_0(vmSymbols::java_lang_InvalidClassException());
3797 }
3798 return JNIHandles::make_local(env, result);
3799 JVM_END
3800
3801
3802 // Returns first non-privileged class loader on the stack (excluding reflection
3803 // generated frames) or null if only classes loaded by the boot class loader
3804 // and extension class loader are found on the stack.
3805
3806 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3807 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3808 // UseNewReflection
3809 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3810 oop loader = vfst.method()->method_holder()->class_loader();
3811 if (loader != NULL && !SystemDictionary::is_ext_class_loader(loader)) {
3812 return JNIHandles::make_local(env, loader);
3813 }
3814 }
3815 return NULL;
3816 JVM_END
3817
3818
3819 // Load a class relative to the most recent class on the stack with a non-null
3820 // classloader.
3821 // This function has been deprecated and should not be considered part of the
3822 // specified JVM interface.
3823
3824 JVM_ENTRY(jclass, JVM_LoadClass0(JNIEnv *env, jobject receiver,
3825 jclass currClass, jstring currClassName))
3826 JVMWrapper("JVM_LoadClass0");
3827 // Receiver is not used
3828 ResourceMark rm(THREAD);
3829
3830 // Class name argument is not guaranteed to be in internal format
3831 Handle classname (THREAD, JNIHandles::resolve_non_null(currClassName));
3832 Handle string = java_lang_String::internalize_classname(classname, CHECK_NULL);
3833
3834 const char* str = java_lang_String::as_utf8_string(string());
3835
3836 if (str == NULL || (int)strlen(str) > Symbol::max_length()) {
3837 // It's impossible to create this class; the name cannot fit
3838 // into the constant pool.
3839 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), str);
3840 }
3841
3842 TempNewSymbol name = SymbolTable::new_symbol(str, CHECK_NULL);
3843 Handle curr_klass (THREAD, JNIHandles::resolve(currClass));
3844 // Find the most recent class on the stack with a non-null classloader
3845 oop loader = NULL;
3846 oop protection_domain = NULL;
3847 if (curr_klass.is_null()) {
3848 for (vframeStream vfst(thread);
3849 !vfst.at_end() && loader == NULL;
3850 vfst.next()) {
3851 if (!vfst.method()->is_native()) {
3852 InstanceKlass* holder = vfst.method()->method_holder();
3853 loader = holder->class_loader();
3854 protection_domain = holder->protection_domain();
3855 }
3856 }
3857 } else {
3858 Klass* curr_klass_oop = java_lang_Class::as_Klass(curr_klass());
3859 loader = InstanceKlass::cast(curr_klass_oop)->class_loader();
3860 protection_domain = InstanceKlass::cast(curr_klass_oop)->protection_domain();
3861 }
3862 Handle h_loader(THREAD, loader);
3863 Handle h_prot (THREAD, protection_domain);
3864 jclass result = find_class_from_class_loader(env, name, true, h_loader, h_prot,
3865 false, thread);
3866 if (TraceClassResolution && result != NULL) {
3867 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
3868 }
3869 return result;
3870 JVM_END
3871
3872
3873 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3874
3875
3876 // resolve array handle and check arguments
3877 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3878 if (arr == NULL) {
3879 THROW_0(vmSymbols::java_lang_NullPointerException());
3880 }
3881 oop a = JNIHandles::resolve_non_null(arr);
3882 if (!a->is_array() || (type_array_only && !a->is_typeArray())) {
3883 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3884 }
3885 return arrayOop(a);
3886 }
3887
3888
3889 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3890 JVMWrapper("JVM_GetArrayLength");
3891 arrayOop a = check_array(env, arr, false, CHECK_0);
3892 return a->length();
3893 JVM_END
3894
3895
3896 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3897 JVMWrapper("JVM_Array_Get");
3898 JvmtiVMObjectAllocEventCollector oam;
3899 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3900 jvalue value;
3901 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3902 oop box = Reflection::box(&value, type, CHECK_NULL);
3903 return JNIHandles::make_local(env, box);
3904 JVM_END
3905
3906
3907 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3908 JVMWrapper("JVM_GetPrimitiveArrayElement");
3909 jvalue value;
3910 value.i = 0; // to initialize value before getting used in CHECK
3911 arrayOop a = check_array(env, arr, true, CHECK_(value));
3912 assert(a->is_typeArray(), "just checking");
3913 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3914 BasicType wide_type = (BasicType) wCode;
3915 if (type != wide_type) {
3916 Reflection::widen(&value, type, wide_type, CHECK_(value));
3917 }
3918 return value;
3919 JVM_END
3920
3921
3922 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3923 JVMWrapper("JVM_SetArrayElement");
3924 arrayOop a = check_array(env, arr, false, CHECK);
3925 oop box = JNIHandles::resolve(val);
3926 jvalue value;
3927 value.i = 0; // to initialize value before getting used in CHECK
3928 BasicType value_type;
3929 if (a->is_objArray()) {
3930 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3931 value_type = Reflection::unbox_for_regular_object(box, &value);
3932 } else {
3933 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3934 }
3935 Reflection::array_set(&value, a, index, value_type, CHECK);
3936 JVM_END
3937
3938
3939 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3940 JVMWrapper("JVM_SetPrimitiveArrayElement");
3941 arrayOop a = check_array(env, arr, true, CHECK);
3942 assert(a->is_typeArray(), "just checking");
3943 BasicType value_type = (BasicType) vCode;
3944 Reflection::array_set(&v, a, index, value_type, CHECK);
3945 JVM_END
3946
3947
3948 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3949 JVMWrapper("JVM_NewArray");
3950 JvmtiVMObjectAllocEventCollector oam;
3951 oop element_mirror = JNIHandles::resolve(eltClass);
3952 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3953 return JNIHandles::make_local(env, result);
3954 JVM_END
3955
3956
3957 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3958 JVMWrapper("JVM_NewMultiArray");
3959 JvmtiVMObjectAllocEventCollector oam;
3960 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3961 oop element_mirror = JNIHandles::resolve(eltClass);
3962 assert(dim_array->is_typeArray(), "just checking");
3963 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3964 return JNIHandles::make_local(env, result);
3965 JVM_END
3966
3967
3968 // Networking library support ////////////////////////////////////////////////////////////////////
3969
3970 JVM_LEAF(jint, JVM_InitializeSocketLibrary())
3971 JVMWrapper("JVM_InitializeSocketLibrary");
3972 return 0;
3973 JVM_END
3974
3975
3976 JVM_LEAF(jint, JVM_Socket(jint domain, jint type, jint protocol))
3977 JVMWrapper("JVM_Socket");
3978 return os::socket(domain, type, protocol);
3979 JVM_END
3980
3981
3982 JVM_LEAF(jint, JVM_SocketClose(jint fd))
3983 JVMWrapper2("JVM_SocketClose (0x%x)", fd);
3984 //%note jvm_r6
3985 return os::socket_close(fd);
3986 JVM_END
3987
3988
3989 JVM_LEAF(jint, JVM_SocketShutdown(jint fd, jint howto))
3990 JVMWrapper2("JVM_SocketShutdown (0x%x)", fd);
3991 //%note jvm_r6
3992 return os::socket_shutdown(fd, howto);
3993 JVM_END
3994
3995
3996 JVM_LEAF(jint, JVM_Recv(jint fd, char *buf, jint nBytes, jint flags))
3997 JVMWrapper2("JVM_Recv (0x%x)", fd);
3998 //%note jvm_r6
3999 return os::recv(fd, buf, (size_t)nBytes, (uint)flags);
4000 JVM_END
4001
4002
4003 JVM_LEAF(jint, JVM_Send(jint fd, char *buf, jint nBytes, jint flags))
4004 JVMWrapper2("JVM_Send (0x%x)", fd);
4005 //%note jvm_r6
4006 return os::send(fd, buf, (size_t)nBytes, (uint)flags);
4007 JVM_END
4008
4009
4010 JVM_LEAF(jint, JVM_Timeout(int fd, long timeout))
4011 JVMWrapper2("JVM_Timeout (0x%x)", fd);
4012 //%note jvm_r6
4013 return os::timeout(fd, timeout);
4014 JVM_END
4015
4016
4017 JVM_LEAF(jint, JVM_Listen(jint fd, jint count))
4018 JVMWrapper2("JVM_Listen (0x%x)", fd);
4019 //%note jvm_r6
4020 return os::listen(fd, count);
4021 JVM_END
4022
4023
4024 JVM_LEAF(jint, JVM_Connect(jint fd, struct sockaddr *him, jint len))
4025 JVMWrapper2("JVM_Connect (0x%x)", fd);
4026 //%note jvm_r6
4027 return os::connect(fd, him, (socklen_t)len);
4028 JVM_END
4029
4030
4031 JVM_LEAF(jint, JVM_Bind(jint fd, struct sockaddr *him, jint len))
4032 JVMWrapper2("JVM_Bind (0x%x)", fd);
4033 //%note jvm_r6
4034 return os::bind(fd, him, (socklen_t)len);
4035 JVM_END
4036
4037
4038 JVM_LEAF(jint, JVM_Accept(jint fd, struct sockaddr *him, jint *len))
4039 JVMWrapper2("JVM_Accept (0x%x)", fd);
4040 //%note jvm_r6
4041 socklen_t socklen = (socklen_t)(*len);
4042 jint result = os::accept(fd, him, &socklen);
4043 *len = (jint)socklen;
4044 return result;
4045 JVM_END
4046
4047
4048 JVM_LEAF(jint, JVM_RecvFrom(jint fd, char *buf, int nBytes, int flags, struct sockaddr *from, int *fromlen))
4049 JVMWrapper2("JVM_RecvFrom (0x%x)", fd);
4050 //%note jvm_r6
4051 socklen_t socklen = (socklen_t)(*fromlen);
4052 jint result = os::recvfrom(fd, buf, (size_t)nBytes, (uint)flags, from, &socklen);
4053 *fromlen = (int)socklen;
4054 return result;
4055 JVM_END
4056
4057
4058 JVM_LEAF(jint, JVM_GetSockName(jint fd, struct sockaddr *him, int *len))
4059 JVMWrapper2("JVM_GetSockName (0x%x)", fd);
4060 //%note jvm_r6
4061 socklen_t socklen = (socklen_t)(*len);
4062 jint result = os::get_sock_name(fd, him, &socklen);
4063 *len = (int)socklen;
4064 return result;
4065 JVM_END
4066
4067
4068 JVM_LEAF(jint, JVM_SendTo(jint fd, char *buf, int len, int flags, struct sockaddr *to, int tolen))
4069 JVMWrapper2("JVM_SendTo (0x%x)", fd);
4070 //%note jvm_r6
4071 return os::sendto(fd, buf, (size_t)len, (uint)flags, to, (socklen_t)tolen);
4072 JVM_END
4073
4074
4075 JVM_LEAF(jint, JVM_SocketAvailable(jint fd, jint *pbytes))
4076 JVMWrapper2("JVM_SocketAvailable (0x%x)", fd);
4077 //%note jvm_r6
4078 return os::socket_available(fd, pbytes);
4079 JVM_END
4080
4081
4082 JVM_LEAF(jint, JVM_GetSockOpt(jint fd, int level, int optname, char *optval, int *optlen))
4083 JVMWrapper2("JVM_GetSockOpt (0x%x)", fd);
4084 //%note jvm_r6
4085 socklen_t socklen = (socklen_t)(*optlen);
4086 jint result = os::get_sock_opt(fd, level, optname, optval, &socklen);
4087 *optlen = (int)socklen;
4088 return result;
4089 JVM_END
4090
4091
4092 JVM_LEAF(jint, JVM_SetSockOpt(jint fd, int level, int optname, const char *optval, int optlen))
4093 JVMWrapper2("JVM_GetSockOpt (0x%x)", fd);
4094 //%note jvm_r6
4095 return os::set_sock_opt(fd, level, optname, optval, (socklen_t)optlen);
4096 JVM_END
4097
4098
4099 JVM_LEAF(int, JVM_GetHostName(char* name, int namelen))
4100 JVMWrapper("JVM_GetHostName");
4101 return os::get_host_name(name, namelen);
4102 JVM_END
4103
4104
4105 // Library support ///////////////////////////////////////////////////////////////////////////
4106
4107 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
4108 //%note jvm_ct
4109 JVMWrapper2("JVM_LoadLibrary (%s)", name);
4110 char ebuf[1024];
4111 void *load_result;
4112 {
4113 ThreadToNativeFromVM ttnfvm(thread);
4114 load_result = os::dll_load(name, ebuf, sizeof ebuf);
4115 }
4116 if (load_result == NULL) {
4117 char msg[1024];
4118 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
4119 // Since 'ebuf' may contain a string encoded using
4120 // platform encoding scheme, we need to pass
4121 // Exceptions::unsafe_to_utf8 to the new_exception method
4122 // as the last argument. See bug 6367357.
4123 Handle h_exception =
4124 Exceptions::new_exception(thread,
4125 vmSymbols::java_lang_UnsatisfiedLinkError(),
4126 msg, Exceptions::unsafe_to_utf8);
4127
4128 THROW_HANDLE_0(h_exception);
4129 }
4130 return load_result;
4131 JVM_END
4132
4133
4134 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
4135 JVMWrapper("JVM_UnloadLibrary");
4136 os::dll_unload(handle);
4137 JVM_END
4138
4139
4140 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
4141 JVMWrapper2("JVM_FindLibraryEntry (%s)", name);
4142 return os::dll_lookup(handle, name);
4143 JVM_END
4144
4145
4146 // Floating point support ////////////////////////////////////////////////////////////////////
4147
4148 JVM_LEAF(jboolean, JVM_IsNaN(jdouble a))
4149 JVMWrapper("JVM_IsNaN");
4150 return g_isnan(a);
4151 JVM_END
4152
4153
4154 // JNI version ///////////////////////////////////////////////////////////////////////////////
4155
4156 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
4157 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version);
4158 return Threads::is_supported_jni_version_including_1_1(version);
4159 JVM_END
4160
4161
4162 // String support ///////////////////////////////////////////////////////////////////////////
4163
4164 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
4165 JVMWrapper("JVM_InternString");
4166 JvmtiVMObjectAllocEventCollector oam;
4167 if (str == NULL) return NULL;
4168 oop string = JNIHandles::resolve_non_null(str);
4169 oop result = StringTable::intern(string, CHECK_NULL);
4170 return (jstring) JNIHandles::make_local(env, result);
4171 JVM_END
4172
4173
4174 // Raw monitor support //////////////////////////////////////////////////////////////////////
4175
4176 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
4177 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
4178 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
4179 // that only works with java threads.
4180
4181
4182 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
4183 VM_Exit::block_if_vm_exited();
4184 JVMWrapper("JVM_RawMonitorCreate");
4185 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
4186 }
4187
4188
4189 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
4190 VM_Exit::block_if_vm_exited();
4191 JVMWrapper("JVM_RawMonitorDestroy");
4192 delete ((Mutex*) mon);
4193 }
4194
4195
4196 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
4197 VM_Exit::block_if_vm_exited();
4198 JVMWrapper("JVM_RawMonitorEnter");
4199 ((Mutex*) mon)->jvm_raw_lock();
4200 return 0;
4201 }
4202
4203
4204 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
4205 VM_Exit::block_if_vm_exited();
4206 JVMWrapper("JVM_RawMonitorExit");
4207 ((Mutex*) mon)->jvm_raw_unlock();
4208 }
4209
4210
4211 // Support for Serialization
4212
4213 typedef jfloat (JNICALL *IntBitsToFloatFn )(JNIEnv* env, jclass cb, jint value);
4214 typedef jdouble (JNICALL *LongBitsToDoubleFn)(JNIEnv* env, jclass cb, jlong value);
4215 typedef jint (JNICALL *FloatToIntBitsFn )(JNIEnv* env, jclass cb, jfloat value);
4216 typedef jlong (JNICALL *DoubleToLongBitsFn)(JNIEnv* env, jclass cb, jdouble value);
4217
4218 static IntBitsToFloatFn int_bits_to_float_fn = NULL;
4219 static LongBitsToDoubleFn long_bits_to_double_fn = NULL;
4220 static FloatToIntBitsFn float_to_int_bits_fn = NULL;
4221 static DoubleToLongBitsFn double_to_long_bits_fn = NULL;
4222
4223
4224 void initialize_converter_functions() {
4225 if (JDK_Version::is_gte_jdk14x_version()) {
4226 // These functions only exist for compatibility with 1.3.1 and earlier
4227 return;
4228 }
4229
4230 // called from universe_post_init()
4231 assert(
4232 int_bits_to_float_fn == NULL &&
4233 long_bits_to_double_fn == NULL &&
4234 float_to_int_bits_fn == NULL &&
4235 double_to_long_bits_fn == NULL ,
4236 "initialization done twice"
4237 );
4238 // initialize
4239 int_bits_to_float_fn = CAST_TO_FN_PTR(IntBitsToFloatFn , NativeLookup::base_library_lookup("java/lang/Float" , "intBitsToFloat" , "(I)F"));
4240 long_bits_to_double_fn = CAST_TO_FN_PTR(LongBitsToDoubleFn, NativeLookup::base_library_lookup("java/lang/Double", "longBitsToDouble", "(J)D"));
4241 float_to_int_bits_fn = CAST_TO_FN_PTR(FloatToIntBitsFn , NativeLookup::base_library_lookup("java/lang/Float" , "floatToIntBits" , "(F)I"));
4242 double_to_long_bits_fn = CAST_TO_FN_PTR(DoubleToLongBitsFn, NativeLookup::base_library_lookup("java/lang/Double", "doubleToLongBits", "(D)J"));
4243 // verify
4244 assert(
4245 int_bits_to_float_fn != NULL &&
4246 long_bits_to_double_fn != NULL &&
4247 float_to_int_bits_fn != NULL &&
4248 double_to_long_bits_fn != NULL ,
4249 "initialization failed"
4250 );
4251 }
4252
4253
4254
4255 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
4256
4257 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
4258 Handle loader, Handle protection_domain,
4259 jboolean throwError, TRAPS) {
4260 // Security Note:
4261 // The Java level wrapper will perform the necessary security check allowing
4262 // us to pass the NULL as the initiating class loader. The VM is responsible for
4263 // the checkPackageAccess relative to the initiating class loader via the
4264 // protection_domain. The protection_domain is passed as NULL by the java code
4265 // if there is no security manager in 3-arg Class.forName().
4266 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
4267
4268 KlassHandle klass_handle(THREAD, klass);
4269 // Check if we should initialize the class
4270 if (init && klass_handle->oop_is_instance()) {
4271 klass_handle->initialize(CHECK_NULL);
4272 }
4273 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
4274 }
4275
4276
4277 // Internal SQE debugging support ///////////////////////////////////////////////////////////
4278
4279 #ifndef PRODUCT
4280
4281 extern "C" {
4282 JNIEXPORT jboolean JNICALL JVM_AccessVMBooleanFlag(const char* name, jboolean* value, jboolean is_get);
4283 JNIEXPORT jboolean JNICALL JVM_AccessVMIntFlag(const char* name, jint* value, jboolean is_get);
4284 JNIEXPORT void JNICALL JVM_VMBreakPoint(JNIEnv *env, jobject obj);
4285 }
4286
4287 JVM_LEAF(jboolean, JVM_AccessVMBooleanFlag(const char* name, jboolean* value, jboolean is_get))
4288 JVMWrapper("JVM_AccessBoolVMFlag");
4289 return is_get ? CommandLineFlags::boolAt((char*) name, (bool*) value) : CommandLineFlags::boolAtPut((char*) name, (bool*) value, Flag::INTERNAL);
4290 JVM_END
4291
4292 JVM_LEAF(jboolean, JVM_AccessVMIntFlag(const char* name, jint* value, jboolean is_get))
4293 JVMWrapper("JVM_AccessVMIntFlag");
4294 intx v;
4295 jboolean result = is_get ? CommandLineFlags::intxAt((char*) name, &v) : CommandLineFlags::intxAtPut((char*) name, &v, Flag::INTERNAL);
4296 *value = (jint)v;
4297 return result;
4298 JVM_END
4299
4300
4301 JVM_ENTRY(void, JVM_VMBreakPoint(JNIEnv *env, jobject obj))
4302 JVMWrapper("JVM_VMBreakPoint");
4303 oop the_obj = JNIHandles::resolve(obj);
4304 BREAKPOINT;
4305 JVM_END
4306
4307
4308 #endif
4309
4310
4311 // Method ///////////////////////////////////////////////////////////////////////////////////////////
4312
4313 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
4314 JVMWrapper("JVM_InvokeMethod");
4315 Handle method_handle;
4316 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
4317 method_handle = Handle(THREAD, JNIHandles::resolve(method));
4318 Handle receiver(THREAD, JNIHandles::resolve(obj));
4319 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
4320 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
4321 jobject res = JNIHandles::make_local(env, result);
4322 if (JvmtiExport::should_post_vm_object_alloc()) {
4323 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
4324 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
4325 if (java_lang_Class::is_primitive(ret_type)) {
4326 // Only for primitive type vm allocates memory for java object.
4327 // See box() method.
4328 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
4329 }
4330 }
4331 return res;
4332 } else {
4333 THROW_0(vmSymbols::java_lang_StackOverflowError());
4334 }
4335 JVM_END
4336
4337
4338 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
4339 JVMWrapper("JVM_NewInstanceFromConstructor");
4340 oop constructor_mirror = JNIHandles::resolve(c);
4341 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
4342 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
4343 jobject res = JNIHandles::make_local(env, result);
4344 if (JvmtiExport::should_post_vm_object_alloc()) {
4345 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
4346 }
4347 return res;
4348 JVM_END
4349
4350 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
4351
4352 JVM_LEAF(jboolean, JVM_SupportsCX8())
4353 JVMWrapper("JVM_SupportsCX8");
4354 return VM_Version::supports_cx8();
4355 JVM_END
4356
4357
4358 JVM_ENTRY(jboolean, JVM_CX8Field(JNIEnv *env, jobject obj, jfieldID fid, jlong oldVal, jlong newVal))
4359 JVMWrapper("JVM_CX8Field");
4360 jlong res;
4361 oop o = JNIHandles::resolve(obj);
4362 intptr_t fldOffs = jfieldIDWorkaround::from_instance_jfieldID(o->klass(), fid);
4363 volatile jlong* addr = (volatile jlong*)((address)o + fldOffs);
4364
4365 assert(VM_Version::supports_cx8(), "cx8 not supported");
4366 res = Atomic::cmpxchg(newVal, addr, oldVal);
4367
4368 return res == oldVal;
4369 JVM_END
4370
4371 // DTrace ///////////////////////////////////////////////////////////////////
4372
4373 JVM_ENTRY(jint, JVM_DTraceGetVersion(JNIEnv* env))
4374 JVMWrapper("JVM_DTraceGetVersion");
4375 return (jint)JVM_TRACING_DTRACE_VERSION;
4376 JVM_END
4377
4378 JVM_ENTRY(jlong,JVM_DTraceActivate(
4379 JNIEnv* env, jint version, jstring module_name, jint providers_count,
4380 JVM_DTraceProvider* providers))
4381 JVMWrapper("JVM_DTraceActivate");
4382 return DTraceJSDT::activate(
4383 version, module_name, providers_count, providers, THREAD);
4384 JVM_END
4385
4386 JVM_ENTRY(jboolean,JVM_DTraceIsProbeEnabled(JNIEnv* env, jmethodID method))
4387 JVMWrapper("JVM_DTraceIsProbeEnabled");
4388 return DTraceJSDT::is_probe_enabled(method);
4389 JVM_END
4390
4391 JVM_ENTRY(void,JVM_DTraceDispose(JNIEnv* env, jlong handle))
4392 JVMWrapper("JVM_DTraceDispose");
4393 DTraceJSDT::dispose(handle);
4394 JVM_END
4395
4396 JVM_ENTRY(jboolean,JVM_DTraceIsSupported(JNIEnv* env))
4397 JVMWrapper("JVM_DTraceIsSupported");
4398 return DTraceJSDT::is_supported();
4399 JVM_END
4400
4401 // Returns an array of all live Thread objects (VM internal JavaThreads,
4402 // jvmti agent threads, and JNI attaching threads are skipped)
4403 // See CR 6404306 regarding JNI attaching threads
4404 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
4405 ResourceMark rm(THREAD);
4406 ThreadsListEnumerator tle(THREAD, false, false);
4407 JvmtiVMObjectAllocEventCollector oam;
4408
4409 int num_threads = tle.num_threads();
4410 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
4411 objArrayHandle threads_ah(THREAD, r);
4412
4413 for (int i = 0; i < num_threads; i++) {
4414 Handle h = tle.get_threadObj(i);
4415 threads_ah->obj_at_put(i, h());
4416 }
4417
4418 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
4419 JVM_END
4420
4421
4422 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
4423 // Return StackTraceElement[][], each element is the stack trace of a thread in
4424 // the corresponding entry in the given threads array
4425 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
4426 JVMWrapper("JVM_DumpThreads");
4427 JvmtiVMObjectAllocEventCollector oam;
4428
4429 // Check if threads is null
4430 if (threads == NULL) {
4431 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
4432 }
4433
4434 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
4435 objArrayHandle ah(THREAD, a);
4436 int num_threads = ah->length();
4437 // check if threads is non-empty array
4438 if (num_threads == 0) {
4439 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
4440 }
4441
4442 // check if threads is not an array of objects of Thread class
4443 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
4444 if (k != SystemDictionary::Thread_klass()) {
4445 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
4446 }
4447
4448 ResourceMark rm(THREAD);
4449
4450 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
4451 for (int i = 0; i < num_threads; i++) {
4452 oop thread_obj = ah->obj_at(i);
4453 instanceHandle h(THREAD, (instanceOop) thread_obj);
4454 thread_handle_array->append(h);
4455 }
4456
4457 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
4458 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
4459
4460 JVM_END
4461
4462 // JVM monitoring and management support
4463 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
4464 return Management::get_jmm_interface(version);
4465 JVM_END
4466
4467 // com.sun.tools.attach.VirtualMachine agent properties support
4468 //
4469 // Initialize the agent properties with the properties maintained in the VM
4470 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
4471 JVMWrapper("JVM_InitAgentProperties");
4472 ResourceMark rm;
4473
4474 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
4475
4476 PUTPROP(props, "sun.java.command", Arguments::java_command());
4477 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
4478 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
4479 return properties;
4480 JVM_END
4481
4482 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
4483 {
4484 JVMWrapper("JVM_GetEnclosingMethodInfo");
4485 JvmtiVMObjectAllocEventCollector oam;
4486
4487 if (ofClass == NULL) {
4488 return NULL;
4489 }
4490 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
4491 // Special handling for primitive objects
4492 if (java_lang_Class::is_primitive(mirror())) {
4493 return NULL;
4494 }
4495 Klass* k = java_lang_Class::as_Klass(mirror());
4496 if (!k->oop_is_instance()) {
4497 return NULL;
4498 }
4499 instanceKlassHandle ik_h(THREAD, k);
4500 int encl_method_class_idx = ik_h->enclosing_method_class_index();
4501 if (encl_method_class_idx == 0) {
4502 return NULL;
4503 }
4504 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
4505 objArrayHandle dest(THREAD, dest_o);
4506 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
4507 dest->obj_at_put(0, enc_k->java_mirror());
4508 int encl_method_method_idx = ik_h->enclosing_method_method_index();
4509 if (encl_method_method_idx != 0) {
4510 Symbol* sym = ik_h->constants()->symbol_at(
4511 extract_low_short_from_int(
4512 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
4513 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
4514 dest->obj_at_put(1, str());
4515 sym = ik_h->constants()->symbol_at(
4516 extract_high_short_from_int(
4517 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
4518 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
4519 dest->obj_at_put(2, str());
4520 }
4521 return (jobjectArray) JNIHandles::make_local(dest());
4522 }
4523 JVM_END
4524
4525 JVM_ENTRY(jintArray, JVM_GetThreadStateValues(JNIEnv* env,
4526 jint javaThreadState))
4527 {
4528 // If new thread states are added in future JDK and VM versions,
4529 // this should check if the JDK version is compatible with thread
4530 // states supported by the VM. Return NULL if not compatible.
4531 //
4532 // This function must map the VM java_lang_Thread::ThreadStatus
4533 // to the Java thread state that the JDK supports.
4534 //
4535
4536 typeArrayHandle values_h;
4537 switch (javaThreadState) {
4538 case JAVA_THREAD_STATE_NEW : {
4539 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL);
4540 values_h = typeArrayHandle(THREAD, r);
4541 values_h->int_at_put(0, java_lang_Thread::NEW);
4542 break;
4543 }
4544 case JAVA_THREAD_STATE_RUNNABLE : {
4545 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL);
4546 values_h = typeArrayHandle(THREAD, r);
4547 values_h->int_at_put(0, java_lang_Thread::RUNNABLE);
4548 break;
4549 }
4550 case JAVA_THREAD_STATE_BLOCKED : {
4551 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL);
4552 values_h = typeArrayHandle(THREAD, r);
4553 values_h->int_at_put(0, java_lang_Thread::BLOCKED_ON_MONITOR_ENTER);
4554 break;
4555 }
4556 case JAVA_THREAD_STATE_WAITING : {
4557 typeArrayOop r = oopFactory::new_typeArray(T_INT, 2, CHECK_NULL);
4558 values_h = typeArrayHandle(THREAD, r);
4559 values_h->int_at_put(0, java_lang_Thread::IN_OBJECT_WAIT);
4560 values_h->int_at_put(1, java_lang_Thread::PARKED);
4561 break;
4562 }
4563 case JAVA_THREAD_STATE_TIMED_WAITING : {
4564 typeArrayOop r = oopFactory::new_typeArray(T_INT, 3, CHECK_NULL);
4565 values_h = typeArrayHandle(THREAD, r);
4566 values_h->int_at_put(0, java_lang_Thread::SLEEPING);
4567 values_h->int_at_put(1, java_lang_Thread::IN_OBJECT_WAIT_TIMED);
4568 values_h->int_at_put(2, java_lang_Thread::PARKED_TIMED);
4569 break;
4570 }
4571 case JAVA_THREAD_STATE_TERMINATED : {
4572 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL);
4573 values_h = typeArrayHandle(THREAD, r);
4574 values_h->int_at_put(0, java_lang_Thread::TERMINATED);
4575 break;
4576 }
4577 default:
4578 // Unknown state - probably incompatible JDK version
4579 return NULL;
4580 }
4581
4582 return (jintArray) JNIHandles::make_local(env, values_h());
4583 }
4584 JVM_END
4585
4586
4587 JVM_ENTRY(jobjectArray, JVM_GetThreadStateNames(JNIEnv* env,
4588 jint javaThreadState,
4589 jintArray values))
4590 {
4591 // If new thread states are added in future JDK and VM versions,
4592 // this should check if the JDK version is compatible with thread
4593 // states supported by the VM. Return NULL if not compatible.
4594 //
4595 // This function must map the VM java_lang_Thread::ThreadStatus
4596 // to the Java thread state that the JDK supports.
4597 //
4598
4599 ResourceMark rm;
4600
4601 // Check if threads is null
4602 if (values == NULL) {
4603 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
4604 }
4605
4606 typeArrayOop v = typeArrayOop(JNIHandles::resolve_non_null(values));
4607 typeArrayHandle values_h(THREAD, v);
4608
4609 objArrayHandle names_h;
4610 switch (javaThreadState) {
4611 case JAVA_THREAD_STATE_NEW : {
4612 assert(values_h->length() == 1 &&
4613 values_h->int_at(0) == java_lang_Thread::NEW,
4614 "Invalid threadStatus value");
4615
4616 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4617 1, /* only 1 substate */
4618 CHECK_NULL);
4619 names_h = objArrayHandle(THREAD, r);
4620 Handle name = java_lang_String::create_from_str("NEW", CHECK_NULL);
4621 names_h->obj_at_put(0, name());
4622 break;
4623 }
4624 case JAVA_THREAD_STATE_RUNNABLE : {
4625 assert(values_h->length() == 1 &&
4626 values_h->int_at(0) == java_lang_Thread::RUNNABLE,
4627 "Invalid threadStatus value");
4628
4629 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4630 1, /* only 1 substate */
4631 CHECK_NULL);
4632 names_h = objArrayHandle(THREAD, r);
4633 Handle name = java_lang_String::create_from_str("RUNNABLE", CHECK_NULL);
4634 names_h->obj_at_put(0, name());
4635 break;
4636 }
4637 case JAVA_THREAD_STATE_BLOCKED : {
4638 assert(values_h->length() == 1 &&
4639 values_h->int_at(0) == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER,
4640 "Invalid threadStatus value");
4641
4642 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4643 1, /* only 1 substate */
4644 CHECK_NULL);
4645 names_h = objArrayHandle(THREAD, r);
4646 Handle name = java_lang_String::create_from_str("BLOCKED", CHECK_NULL);
4647 names_h->obj_at_put(0, name());
4648 break;
4649 }
4650 case JAVA_THREAD_STATE_WAITING : {
4651 assert(values_h->length() == 2 &&
4652 values_h->int_at(0) == java_lang_Thread::IN_OBJECT_WAIT &&
4653 values_h->int_at(1) == java_lang_Thread::PARKED,
4654 "Invalid threadStatus value");
4655 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4656 2, /* number of substates */
4657 CHECK_NULL);
4658 names_h = objArrayHandle(THREAD, r);
4659 Handle name0 = java_lang_String::create_from_str("WAITING.OBJECT_WAIT",
4660 CHECK_NULL);
4661 Handle name1 = java_lang_String::create_from_str("WAITING.PARKED",
4662 CHECK_NULL);
4663 names_h->obj_at_put(0, name0());
4664 names_h->obj_at_put(1, name1());
4665 break;
4666 }
4667 case JAVA_THREAD_STATE_TIMED_WAITING : {
4668 assert(values_h->length() == 3 &&
4669 values_h->int_at(0) == java_lang_Thread::SLEEPING &&
4670 values_h->int_at(1) == java_lang_Thread::IN_OBJECT_WAIT_TIMED &&
4671 values_h->int_at(2) == java_lang_Thread::PARKED_TIMED,
4672 "Invalid threadStatus value");
4673 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4674 3, /* number of substates */
4675 CHECK_NULL);
4676 names_h = objArrayHandle(THREAD, r);
4677 Handle name0 = java_lang_String::create_from_str("TIMED_WAITING.SLEEPING",
4678 CHECK_NULL);
4679 Handle name1 = java_lang_String::create_from_str("TIMED_WAITING.OBJECT_WAIT",
4680 CHECK_NULL);
4681 Handle name2 = java_lang_String::create_from_str("TIMED_WAITING.PARKED",
4682 CHECK_NULL);
4683 names_h->obj_at_put(0, name0());
4684 names_h->obj_at_put(1, name1());
4685 names_h->obj_at_put(2, name2());
4686 break;
4687 }
4688 case JAVA_THREAD_STATE_TERMINATED : {
4689 assert(values_h->length() == 1 &&
4690 values_h->int_at(0) == java_lang_Thread::TERMINATED,
4691 "Invalid threadStatus value");
4692 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4693 1, /* only 1 substate */
4694 CHECK_NULL);
4695 names_h = objArrayHandle(THREAD, r);
4696 Handle name = java_lang_String::create_from_str("TERMINATED", CHECK_NULL);
4697 names_h->obj_at_put(0, name());
4698 break;
4699 }
4700 default:
4701 // Unknown state - probably incompatible JDK version
4702 return NULL;
4703 }
4704 return (jobjectArray) JNIHandles::make_local(env, names_h());
4705 }
4706 JVM_END
4707
4708 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
4709 {
4710 memset(info, 0, info_size);
4711
4712 info->jvm_version = Abstract_VM_Version::jvm_version();
4713 info->update_version = 0; /* 0 in HotSpot Express VM */
4714 info->special_update_version = 0; /* 0 in HotSpot Express VM */
4715
4716 // when we add a new capability in the jvm_version_info struct, we should also
4717 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
4718 // counter defined in runtimeService.cpp.
4719 info->is_attachable = AttachListener::is_attach_supported();
4720 }
4721 JVM_END