Mon, 03 Dec 2018 07:29:54 -0500
8141491: Unaligned memory access in Bits.c
Summary: Introduce alignment-safe Copy::conjoint_swap and JVM_CopySwapMemory
Reviewed-by: mikael, dholmes
1 /*
2 * Copyright (c) 1997, 2018, 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 */
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 "memory/oopFactory.hpp"
41 #include "memory/referenceType.hpp"
42 #include "memory/universe.inline.hpp"
43 #include "oops/fieldStreams.hpp"
44 #include "oops/instanceKlass.hpp"
45 #include "oops/objArrayKlass.hpp"
46 #include "oops/method.hpp"
47 #include "prims/jvm.h"
48 #include "prims/jvm_misc.hpp"
49 #include "prims/jvmtiExport.hpp"
50 #include "prims/jvmtiThreadState.hpp"
51 #include "prims/nativeLookup.hpp"
52 #include "prims/privilegedStack.hpp"
53 #include "runtime/arguments.hpp"
54 #include "runtime/dtraceJSDT.hpp"
55 #include "runtime/handles.inline.hpp"
56 #include "runtime/init.hpp"
57 #include "runtime/interfaceSupport.hpp"
58 #include "runtime/java.hpp"
59 #include "runtime/javaCalls.hpp"
60 #include "runtime/jfieldIDWorkaround.hpp"
61 #include "runtime/orderAccess.inline.hpp"
62 #include "runtime/os.hpp"
63 #include "runtime/perfData.hpp"
64 #include "runtime/reflection.hpp"
65 #include "runtime/vframe.hpp"
66 #include "runtime/vm_operations.hpp"
67 #include "services/attachListener.hpp"
68 #include "services/management.hpp"
69 #include "services/threadService.hpp"
70 #include "trace/tracing.hpp"
71 #include "utilities/copy.hpp"
72 #include "utilities/defaultStream.hpp"
73 #include "utilities/dtrace.hpp"
74 #include "utilities/events.hpp"
75 #include "utilities/histogram.hpp"
76 #include "utilities/top.hpp"
77 #include "utilities/utf8.hpp"
78 #ifdef TARGET_OS_FAMILY_linux
79 # include "jvm_linux.h"
80 #endif
81 #ifdef TARGET_OS_FAMILY_solaris
82 # include "jvm_solaris.h"
83 #endif
84 #ifdef TARGET_OS_FAMILY_windows
85 # include "jvm_windows.h"
86 #endif
87 #ifdef TARGET_OS_FAMILY_aix
88 # include "jvm_aix.h"
89 #endif
90 #ifdef TARGET_OS_FAMILY_bsd
91 # include "jvm_bsd.h"
92 #endif
94 #if INCLUDE_ALL_GCS
95 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
96 #endif // INCLUDE_ALL_GCS
98 #include <errno.h>
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 */
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":
113 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
114 JVMWrapper("JVM_GetClassDeclaredFields");
116 // Object address to be held directly in mirror & not visible to GC
117 oop mirror = JNIHandles::resolve_non_null(ofClass);
119 // If this ctor can hit a safepoint, moving objects around, then
120 ComplexConstructor foo;
122 // Boom! mirror may point to JUNK instead of the intended object
123 (some dereference of mirror)
125 // Here's another call that may block for GC, making mirror stale
126 MutexLocker ml(some_lock);
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);
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 */
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);
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);
156 Method* last_caller = NULL;
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 }
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 }
230 // Wrapper to trace JVM functions
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 };
246 Histogram* JVMHistogram;
247 volatile jint JVMHistogram_lock = 0;
249 class JVMHistogramElement : public HistogramElement {
250 public:
251 JVMHistogramElement(const char* name);
252 };
254 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
255 _name = elementName;
256 uintx count = 0;
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 }
268 if(JVMHistogram == NULL)
269 JVMHistogram = new Histogram("JVM Call Counts",100);
271 JVMHistogram->add_element(this);
272 Atomic::dec(&JVMHistogram_lock);
273 }
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!
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
291 // Interface version /////////////////////////////////////////////////////////////////////
294 JVM_LEAF(jint, JVM_GetInterfaceVersion())
295 return JVM_INTERFACE_VERSION;
296 JVM_END
299 // java.lang.System //////////////////////////////////////////////////////////////////////
302 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
303 JVMWrapper("JVM_CurrentTimeMillis");
304 return os::javaTimeMillis();
305 JVM_END
307 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
308 JVMWrapper("JVM_NanoTime");
309 return os::javaTimeNanos();
310 JVM_END
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
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 }
346 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
349 JVM_ENTRY(jobject, JVM_InitProperties(JNIEnv *env, jobject properties))
350 JVMWrapper("JVM_InitProperties");
351 ResourceMark rm;
353 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
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 }
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 }
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
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
397 if (*compiler_name != '\0' &&
398 (Arguments::mode() != Arguments::_int)) {
399 PUTPROP(props, "sun.management.compiler", compiler_name);
400 }
401 }
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);
411 return properties;
412 JVM_END
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
432 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
434 extern volatile jint vm_created;
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
446 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
447 before_exit(thread);
448 vm_exit(code);
449 JVM_END
452 JVM_LEAF(void, JVM_OnExit(void (*func)(void)))
453 register_on_exit_function(func);
454 JVM_END
457 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
458 JVMWrapper("JVM_GC");
459 if (!DisableExplicitGC) {
460 Universe::heap()->collect(GCCause::_java_lang_system_gc);
461 }
462 JVM_END
465 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
466 JVMWrapper("JVM_MaxObjectInspectionAge");
467 return Universe::heap()->millis_since_last_gc();
468 JVM_END
471 JVM_LEAF(void, JVM_TraceInstructions(jboolean on))
472 if (PrintJVMWarnings) warning("JVM_TraceInstructions not supported");
473 JVM_END
476 JVM_LEAF(void, JVM_TraceMethodCalls(jboolean on))
477 if (PrintJVMWarnings) warning("JVM_TraceMethodCalls not supported");
478 JVM_END
480 static inline jlong convert_size_t_to_jlong(size_t val) {
481 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
482 NOT_LP64 (return (jlong)val;)
483 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
484 }
486 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
487 JVMWrapper("JVM_TotalMemory");
488 size_t n = Universe::heap()->capacity();
489 return convert_size_t_to_jlong(n);
490 JVM_END
493 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
494 JVMWrapper("JVM_FreeMemory");
495 CollectedHeap* ch = Universe::heap();
496 size_t n;
497 {
498 MutexLocker x(Heap_lock);
499 n = ch->capacity() - ch->used();
500 }
501 return convert_size_t_to_jlong(n);
502 JVM_END
505 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
506 JVMWrapper("JVM_MaxMemory");
507 size_t n = Universe::heap()->max_capacity();
508 return convert_size_t_to_jlong(n);
509 JVM_END
512 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
513 JVMWrapper("JVM_ActiveProcessorCount");
514 return os::active_processor_count();
515 JVM_END
519 // java.lang.Throwable //////////////////////////////////////////////////////
522 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
523 JVMWrapper("JVM_FillInStackTrace");
524 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
525 java_lang_Throwable::fill_in_stack_trace(exception);
526 JVM_END
529 JVM_ENTRY(jint, JVM_GetStackTraceDepth(JNIEnv *env, jobject throwable))
530 JVMWrapper("JVM_GetStackTraceDepth");
531 oop exception = JNIHandles::resolve(throwable);
532 return java_lang_Throwable::get_stack_trace_depth(exception, THREAD);
533 JVM_END
536 JVM_ENTRY(jobject, JVM_GetStackTraceElement(JNIEnv *env, jobject throwable, jint index))
537 JVMWrapper("JVM_GetStackTraceElement");
538 JvmtiVMObjectAllocEventCollector oam; // This ctor (throughout this module) may trigger a safepoint/GC
539 oop exception = JNIHandles::resolve(throwable);
540 oop element = java_lang_Throwable::get_stack_trace_element(exception, index, CHECK_NULL);
541 return JNIHandles::make_local(env, element);
542 JVM_END
545 // java.lang.Object ///////////////////////////////////////////////
548 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
549 JVMWrapper("JVM_IHashCode");
550 // as implemented in the classic virtual machine; return 0 if object is NULL
551 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
552 JVM_END
555 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
556 JVMWrapper("JVM_MonitorWait");
557 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
558 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
559 if (JvmtiExport::should_post_monitor_wait()) {
560 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
562 // The current thread already owns the monitor and it has not yet
563 // been added to the wait queue so the current thread cannot be
564 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
565 // event handler cannot accidentally consume an unpark() meant for
566 // the ParkEvent associated with this ObjectMonitor.
567 }
568 ObjectSynchronizer::wait(obj, ms, CHECK);
569 JVM_END
572 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
573 JVMWrapper("JVM_MonitorNotify");
574 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
575 ObjectSynchronizer::notify(obj, CHECK);
576 JVM_END
579 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
580 JVMWrapper("JVM_MonitorNotifyAll");
581 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
582 ObjectSynchronizer::notifyall(obj, CHECK);
583 JVM_END
586 static void fixup_cloned_reference(ReferenceType ref_type, oop src, oop clone) {
587 // If G1 is enabled then we need to register a non-null referent
588 // with the SATB barrier.
589 #if INCLUDE_ALL_GCS
590 if (UseG1GC) {
591 oop referent = java_lang_ref_Reference::referent(clone);
592 if (referent != NULL) {
593 G1SATBCardTableModRefBS::enqueue(referent);
594 }
595 }
596 #endif // INCLUDE_ALL_GCS
597 if ((java_lang_ref_Reference::next(clone) != NULL) ||
598 (java_lang_ref_Reference::queue(clone) == java_lang_ref_ReferenceQueue::ENQUEUED_queue())) {
599 // If the source has been enqueued or is being enqueued, don't
600 // register the clone with a queue.
601 java_lang_ref_Reference::set_queue(clone, java_lang_ref_ReferenceQueue::NULL_queue());
602 }
603 // discovered and next are list links; the clone is not in those lists.
604 java_lang_ref_Reference::set_discovered(clone, NULL);
605 java_lang_ref_Reference::set_next(clone, NULL);
606 }
608 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
609 JVMWrapper("JVM_Clone");
610 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
611 const KlassHandle klass (THREAD, obj->klass());
612 JvmtiVMObjectAllocEventCollector oam;
614 #ifdef ASSERT
615 // Just checking that the cloneable flag is set correct
616 if (obj->is_array()) {
617 guarantee(klass->is_cloneable(), "all arrays are cloneable");
618 } else {
619 guarantee(obj->is_instance(), "should be instanceOop");
620 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
621 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
622 }
623 #endif
625 // Check if class of obj supports the Cloneable interface.
626 // All arrays are considered to be cloneable (See JLS 20.1.5)
627 if (!klass->is_cloneable()) {
628 ResourceMark rm(THREAD);
629 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
630 }
632 // Make shallow object copy
633 ReferenceType ref_type = REF_NONE;
634 const int size = obj->size();
635 oop new_obj_oop = NULL;
636 if (obj->is_array()) {
637 const int length = ((arrayOop)obj())->length();
638 new_obj_oop = CollectedHeap::array_allocate(klass, size, length, CHECK_NULL);
639 } else {
640 ref_type = InstanceKlass::cast(klass())->reference_type();
641 assert((ref_type == REF_NONE) ==
642 !klass->is_subclass_of(SystemDictionary::Reference_klass()),
643 "invariant");
644 new_obj_oop = CollectedHeap::obj_allocate(klass, size, CHECK_NULL);
645 }
647 // 4839641 (4840070): We must do an oop-atomic copy, because if another thread
648 // is modifying a reference field in the clonee, a non-oop-atomic copy might
649 // be suspended in the middle of copying the pointer and end up with parts
650 // of two different pointers in the field. Subsequent dereferences will crash.
651 // 4846409: an oop-copy of objects with long or double fields or arrays of same
652 // won't copy the longs/doubles atomically in 32-bit vm's, so we copy jlongs instead
653 // of oops. We know objects are aligned on a minimum of an jlong boundary.
654 // The same is true of StubRoutines::object_copy and the various oop_copy
655 // variants, and of the code generated by the inline_native_clone intrinsic.
656 assert(MinObjAlignmentInBytes >= BytesPerLong, "objects misaligned");
657 Copy::conjoint_jlongs_atomic((jlong*)obj(), (jlong*)new_obj_oop,
658 (size_t)align_object_size(size) / HeapWordsPerLong);
659 // Clear the header
660 new_obj_oop->init_mark();
662 // Store check (mark entire object and let gc sort it out)
663 BarrierSet* bs = Universe::heap()->barrier_set();
664 assert(bs->has_write_region_opt(), "Barrier set does not have write_region");
665 bs->write_region(MemRegion((HeapWord*)new_obj_oop, size));
667 // If cloning a Reference, set Reference fields to a safe state.
668 // Fixup must be completed before any safepoint.
669 if (ref_type != REF_NONE) {
670 fixup_cloned_reference(ref_type, obj(), new_obj_oop);
671 }
673 Handle new_obj(THREAD, new_obj_oop);
674 // Special handling for MemberNames. Since they contain Method* metadata, they
675 // must be registered so that RedefineClasses can fix metadata contained in them.
676 if (java_lang_invoke_MemberName::is_instance(new_obj()) &&
677 java_lang_invoke_MemberName::is_method(new_obj())) {
678 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(new_obj());
679 // MemberName may be unresolved, so doesn't need registration until resolved.
680 if (method != NULL) {
681 methodHandle m(THREAD, method);
682 // This can safepoint and redefine method, so need both new_obj and method
683 // in a handle, for two different reasons. new_obj can move, method can be
684 // deleted if nothing is using it on the stack.
685 m->method_holder()->add_member_name(new_obj(), false);
686 }
687 }
689 // Caution: this involves a java upcall, so the clone should be
690 // "gc-robust" by this stage.
691 if (klass->has_finalizer()) {
692 assert(obj->is_instance(), "should be instanceOop");
693 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
694 new_obj = Handle(THREAD, new_obj_oop);
695 }
697 return JNIHandles::make_local(env, new_obj());
698 JVM_END
700 // java.lang.Compiler ////////////////////////////////////////////////////
702 // The initial cuts of the HotSpot VM will not support JITs, and all existing
703 // JITs would need extensive changes to work with HotSpot. The JIT-related JVM
704 // functions are all silently ignored unless JVM warnings are printed.
706 JVM_LEAF(void, JVM_InitializeCompiler (JNIEnv *env, jclass compCls))
707 if (PrintJVMWarnings) warning("JVM_InitializeCompiler not supported");
708 JVM_END
711 JVM_LEAF(jboolean, JVM_IsSilentCompiler(JNIEnv *env, jclass compCls))
712 if (PrintJVMWarnings) warning("JVM_IsSilentCompiler not supported");
713 return JNI_FALSE;
714 JVM_END
717 JVM_LEAF(jboolean, JVM_CompileClass(JNIEnv *env, jclass compCls, jclass cls))
718 if (PrintJVMWarnings) warning("JVM_CompileClass not supported");
719 return JNI_FALSE;
720 JVM_END
723 JVM_LEAF(jboolean, JVM_CompileClasses(JNIEnv *env, jclass cls, jstring jname))
724 if (PrintJVMWarnings) warning("JVM_CompileClasses not supported");
725 return JNI_FALSE;
726 JVM_END
729 JVM_LEAF(jobject, JVM_CompilerCommand(JNIEnv *env, jclass compCls, jobject arg))
730 if (PrintJVMWarnings) warning("JVM_CompilerCommand not supported");
731 return NULL;
732 JVM_END
735 JVM_LEAF(void, JVM_EnableCompiler(JNIEnv *env, jclass compCls))
736 if (PrintJVMWarnings) warning("JVM_EnableCompiler not supported");
737 JVM_END
740 JVM_LEAF(void, JVM_DisableCompiler(JNIEnv *env, jclass compCls))
741 if (PrintJVMWarnings) warning("JVM_DisableCompiler not supported");
742 JVM_END
746 // Error message support //////////////////////////////////////////////////////
748 JVM_LEAF(jint, JVM_GetLastErrorString(char *buf, int len))
749 JVMWrapper("JVM_GetLastErrorString");
750 return (jint)os::lasterror(buf, len);
751 JVM_END
754 // java.io.File ///////////////////////////////////////////////////////////////
756 JVM_LEAF(char*, JVM_NativePath(char* path))
757 JVMWrapper2("JVM_NativePath (%s)", path);
758 return os::native_path(path);
759 JVM_END
762 // java.nio.Bits ///////////////////////////////////////////////////////////////
764 #define MAX_OBJECT_SIZE \
765 ( arrayOopDesc::header_size(T_DOUBLE) * HeapWordSize \
766 + ((julong)max_jint * sizeof(double)) )
768 static inline jlong field_offset_to_byte_offset(jlong field_offset) {
769 return field_offset;
770 }
772 static inline void assert_field_offset_sane(oop p, jlong field_offset) {
773 #ifdef ASSERT
774 jlong byte_offset = field_offset_to_byte_offset(field_offset);
776 if (p != NULL) {
777 assert(byte_offset >= 0 && byte_offset <= (jlong)MAX_OBJECT_SIZE, "sane offset");
778 if (byte_offset == (jint)byte_offset) {
779 void* ptr_plus_disp = (address)p + byte_offset;
780 assert((void*)p->obj_field_addr<oop>((jint)byte_offset) == ptr_plus_disp,
781 "raw [ptr+disp] must be consistent with oop::field_base");
782 }
783 jlong p_size = HeapWordSize * (jlong)(p->size());
784 assert(byte_offset < p_size, err_msg("Unsafe access: offset " INT64_FORMAT
785 " > object's size " INT64_FORMAT,
786 (int64_t)byte_offset, (int64_t)p_size));
787 }
788 #endif
789 }
791 static inline void* index_oop_from_field_offset_long(oop p, jlong field_offset) {
792 assert_field_offset_sane(p, field_offset);
793 jlong byte_offset = field_offset_to_byte_offset(field_offset);
795 if (sizeof(char*) == sizeof(jint)) { // (this constant folds!)
796 return (address)p + (jint) byte_offset;
797 } else {
798 return (address)p + byte_offset;
799 }
800 }
802 // This function is a leaf since if the source and destination are both in native memory
803 // the copy may potentially be very large, and we don't want to disable GC if we can avoid it.
804 // If either source or destination (or both) are on the heap, the function will enter VM using
805 // JVM_ENTRY_FROM_LEAF
806 JVM_LEAF(void, JVM_CopySwapMemory(JNIEnv *env, jobject srcObj, jlong srcOffset,
807 jobject dstObj, jlong dstOffset, jlong size,
808 jlong elemSize)) {
810 size_t sz = (size_t)size;
811 size_t esz = (size_t)elemSize;
813 if (srcObj == NULL && dstObj == NULL) {
814 // Both src & dst are in native memory
815 address src = (address)srcOffset;
816 address dst = (address)dstOffset;
818 Copy::conjoint_swap(src, dst, sz, esz);
819 } else {
820 // At least one of src/dst are on heap, transition to VM to access raw pointers
822 JVM_ENTRY_FROM_LEAF(env, void, JVM_CopySwapMemory) {
823 oop srcp = JNIHandles::resolve(srcObj);
824 oop dstp = JNIHandles::resolve(dstObj);
826 address src = (address)index_oop_from_field_offset_long(srcp, srcOffset);
827 address dst = (address)index_oop_from_field_offset_long(dstp, dstOffset);
829 Copy::conjoint_swap(src, dst, sz, esz);
830 } JVM_END
831 }
832 } JVM_END
835 // Misc. class handling ///////////////////////////////////////////////////////////
838 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env, int depth))
839 JVMWrapper("JVM_GetCallerClass");
841 // Pre-JDK 8 and early builds of JDK 8 don't have a CallerSensitive annotation; or
842 // sun.reflect.Reflection.getCallerClass with a depth parameter is provided
843 // temporarily for existing code to use until a replacement API is defined.
844 if (SystemDictionary::reflect_CallerSensitive_klass() == NULL || depth != JVM_CALLER_DEPTH) {
845 Klass* k = thread->security_get_caller_class(depth);
846 return (k == NULL) ? NULL : (jclass) JNIHandles::make_local(env, k->java_mirror());
847 }
849 // Getting the class of the caller frame.
850 //
851 // The call stack at this point looks something like this:
852 //
853 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
854 // [1] [ @CallerSensitive API.method ]
855 // [.] [ (skipped intermediate frames) ]
856 // [n] [ caller ]
857 vframeStream vfst(thread);
858 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
859 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
860 Method* m = vfst.method();
861 assert(m != NULL, "sanity");
862 switch (n) {
863 case 0:
864 // This must only be called from Reflection.getCallerClass
865 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
866 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
867 }
868 // fall-through
869 case 1:
870 // Frame 0 and 1 must be caller sensitive.
871 if (!m->caller_sensitive()) {
872 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
873 }
874 break;
875 default:
876 if (!m->is_ignored_by_security_stack_walk()) {
877 // We have reached the desired frame; return the holder class.
878 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
879 }
880 break;
881 }
882 }
883 return NULL;
884 JVM_END
887 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
888 JVMWrapper("JVM_FindPrimitiveClass");
889 oop mirror = NULL;
890 BasicType t = name2type(utf);
891 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
892 mirror = Universe::java_mirror(t);
893 }
894 if (mirror == NULL) {
895 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
896 } else {
897 return (jclass) JNIHandles::make_local(env, mirror);
898 }
899 JVM_END
902 JVM_ENTRY(void, JVM_ResolveClass(JNIEnv* env, jclass cls))
903 JVMWrapper("JVM_ResolveClass");
904 if (PrintJVMWarnings) warning("JVM_ResolveClass not implemented");
905 JVM_END
908 JVM_ENTRY(jboolean, JVM_KnownToNotExist(JNIEnv *env, jobject loader, const char *classname))
909 JVMWrapper("JVM_KnownToNotExist");
910 #if INCLUDE_CDS
911 return ClassLoaderExt::known_to_not_exist(env, loader, classname, CHECK_(false));
912 #else
913 return false;
914 #endif
915 JVM_END
918 JVM_ENTRY(jobjectArray, JVM_GetResourceLookupCacheURLs(JNIEnv *env, jobject loader))
919 JVMWrapper("JVM_GetResourceLookupCacheURLs");
920 #if INCLUDE_CDS
921 return ClassLoaderExt::get_lookup_cache_urls(env, loader, CHECK_NULL);
922 #else
923 return NULL;
924 #endif
925 JVM_END
928 JVM_ENTRY(jintArray, JVM_GetResourceLookupCache(JNIEnv *env, jobject loader, const char *resource_name))
929 JVMWrapper("JVM_GetResourceLookupCache");
930 #if INCLUDE_CDS
931 return ClassLoaderExt::get_lookup_cache(env, loader, resource_name, CHECK_NULL);
932 #else
933 return NULL;
934 #endif
935 JVM_END
938 // Returns a class loaded by the bootstrap class loader; or null
939 // if not found. ClassNotFoundException is not thrown.
940 //
941 // Rationale behind JVM_FindClassFromBootLoader
942 // a> JVM_FindClassFromClassLoader was never exported in the export tables.
943 // b> because of (a) java.dll has a direct dependecy on the unexported
944 // private symbol "_JVM_FindClassFromClassLoader@20".
945 // c> the launcher cannot use the private symbol as it dynamically opens
946 // the entry point, so if something changes, the launcher will fail
947 // unexpectedly at runtime, it is safest for the launcher to dlopen a
948 // stable exported interface.
949 // d> re-exporting JVM_FindClassFromClassLoader as public, will cause its
950 // signature to change from _JVM_FindClassFromClassLoader@20 to
951 // JVM_FindClassFromClassLoader and will not be backward compatible
952 // with older JDKs.
953 // Thus a public/stable exported entry point is the right solution,
954 // public here means public in linker semantics, and is exported only
955 // to the JDK, and is not intended to be a public API.
957 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
958 const char* name))
959 JVMWrapper2("JVM_FindClassFromBootLoader %s", name);
961 // Java libraries should ensure that name is never null...
962 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
963 // It's impossible to create this class; the name cannot fit
964 // into the constant pool.
965 return NULL;
966 }
968 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
969 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
970 if (k == NULL) {
971 return NULL;
972 }
974 if (TraceClassResolution) {
975 trace_class_resolution(k);
976 }
977 return (jclass) JNIHandles::make_local(env, k->java_mirror());
978 JVM_END
980 // Not used; JVM_FindClassFromCaller replaces this.
981 JVM_ENTRY(jclass, JVM_FindClassFromClassLoader(JNIEnv* env, const char* name,
982 jboolean init, jobject loader,
983 jboolean throwError))
984 JVMWrapper3("JVM_FindClassFromClassLoader %s throw %s", name,
985 throwError ? "error" : "exception");
986 // Java libraries should ensure that name is never null...
987 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
988 // It's impossible to create this class; the name cannot fit
989 // into the constant pool.
990 if (throwError) {
991 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
992 } else {
993 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
994 }
995 }
996 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
997 Handle h_loader(THREAD, JNIHandles::resolve(loader));
998 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
999 Handle(), throwError, THREAD);
1001 if (TraceClassResolution && result != NULL) {
1002 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1003 }
1004 return result;
1005 JVM_END
1007 // Find a class with this name in this loader, using the caller's protection domain.
1008 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
1009 jboolean init, jobject loader,
1010 jclass caller))
1011 JVMWrapper2("JVM_FindClassFromCaller %s throws ClassNotFoundException", name);
1012 // Java libraries should ensure that name is never null...
1013 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
1014 // It's impossible to create this class; the name cannot fit
1015 // into the constant pool.
1016 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
1017 }
1019 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
1021 oop loader_oop = JNIHandles::resolve(loader);
1022 oop from_class = JNIHandles::resolve(caller);
1023 oop protection_domain = NULL;
1024 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
1025 // NPE. Put it in another way, the bootstrap class loader has all permission and
1026 // thus no checkPackageAccess equivalence in the VM class loader.
1027 // The caller is also passed as NULL by the java code if there is no security
1028 // manager to avoid the performance cost of getting the calling class.
1029 if (from_class != NULL && loader_oop != NULL) {
1030 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
1031 }
1033 Handle h_loader(THREAD, loader_oop);
1034 Handle h_prot(THREAD, protection_domain);
1035 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1036 h_prot, false, THREAD);
1038 if (TraceClassResolution && result != NULL) {
1039 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1040 }
1041 return result;
1042 JVM_END
1044 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1045 jboolean init, jclass from))
1046 JVMWrapper2("JVM_FindClassFromClass %s", name);
1047 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
1048 // It's impossible to create this class; the name cannot fit
1049 // into the constant pool.
1050 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
1051 }
1052 TempNewSymbol h_name = SymbolTable::new_symbol(name, CHECK_NULL);
1053 oop from_class_oop = JNIHandles::resolve(from);
1054 Klass* from_class = (from_class_oop == NULL)
1055 ? (Klass*)NULL
1056 : java_lang_Class::as_Klass(from_class_oop);
1057 oop class_loader = NULL;
1058 oop protection_domain = NULL;
1059 if (from_class != NULL) {
1060 class_loader = from_class->class_loader();
1061 protection_domain = from_class->protection_domain();
1062 }
1063 Handle h_loader(THREAD, class_loader);
1064 Handle h_prot (THREAD, protection_domain);
1065 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1066 h_prot, true, thread);
1068 if (TraceClassResolution && result != NULL) {
1069 // this function is generally only used for class loading during verification.
1070 ResourceMark rm;
1071 oop from_mirror = JNIHandles::resolve_non_null(from);
1072 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
1073 const char * from_name = from_class->external_name();
1075 oop mirror = JNIHandles::resolve_non_null(result);
1076 Klass* to_class = java_lang_Class::as_Klass(mirror);
1077 const char * to = to_class->external_name();
1078 tty->print("RESOLVE %s %s (verification)\n", from_name, to);
1079 }
1081 return result;
1082 JVM_END
1084 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
1085 if (loader.is_null()) {
1086 return;
1087 }
1089 // check whether the current caller thread holds the lock or not.
1090 // If not, increment the corresponding counter
1091 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
1092 ObjectSynchronizer::owner_self) {
1093 counter->inc();
1094 }
1095 }
1097 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1098 // and JVM_DefineClassWithSourceCond()
1099 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
1100 jobject loader, const jbyte *buf,
1101 jsize len, jobject pd, const char *source,
1102 jboolean verify, TRAPS) {
1103 if (source == NULL) source = "__JVM_DefineClass__";
1105 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1106 JavaThread* jt = (JavaThread*) THREAD;
1108 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1109 ClassLoader::perf_define_appclass_selftime(),
1110 ClassLoader::perf_define_appclasses(),
1111 jt->get_thread_stat()->perf_recursion_counts_addr(),
1112 jt->get_thread_stat()->perf_timers_addr(),
1113 PerfClassTraceTime::DEFINE_CLASS);
1115 if (UsePerfData) {
1116 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1117 }
1119 // Since exceptions can be thrown, class initialization can take place
1120 // if name is NULL no check for class name in .class stream has to be made.
1121 TempNewSymbol class_name = NULL;
1122 if (name != NULL) {
1123 const int str_len = (int)strlen(name);
1124 if (str_len > Symbol::max_length()) {
1125 // It's impossible to create this class; the name cannot fit
1126 // into the constant pool.
1127 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), name);
1128 }
1129 class_name = SymbolTable::new_symbol(name, str_len, CHECK_NULL);
1130 }
1132 ResourceMark rm(THREAD);
1133 ClassFileStream st((u1*) buf, len, (char *)source);
1134 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1135 if (UsePerfData) {
1136 is_lock_held_by_thread(class_loader,
1137 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
1138 THREAD);
1139 }
1140 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1141 Klass* k = SystemDictionary::resolve_from_stream(class_name, class_loader,
1142 protection_domain, &st,
1143 verify != 0,
1144 CHECK_NULL);
1146 if (TraceClassResolution && k != NULL) {
1147 trace_class_resolution(k);
1148 }
1150 return (jclass) JNIHandles::make_local(env, k->java_mirror());
1151 }
1154 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1155 JVMWrapper2("JVM_DefineClass %s", name);
1157 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, true, THREAD);
1158 JVM_END
1161 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1162 JVMWrapper2("JVM_DefineClassWithSource %s", name);
1164 return jvm_define_class_common(env, name, loader, buf, len, pd, source, true, THREAD);
1165 JVM_END
1167 JVM_ENTRY(jclass, JVM_DefineClassWithSourceCond(JNIEnv *env, const char *name,
1168 jobject loader, const jbyte *buf,
1169 jsize len, jobject pd,
1170 const char *source, jboolean verify))
1171 JVMWrapper2("JVM_DefineClassWithSourceCond %s", name);
1173 return jvm_define_class_common(env, name, loader, buf, len, pd, source, verify, THREAD);
1174 JVM_END
1176 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1177 JVMWrapper("JVM_FindLoadedClass");
1178 ResourceMark rm(THREAD);
1180 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1181 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
1183 const char* str = java_lang_String::as_utf8_string(string());
1184 // Sanity check, don't expect null
1185 if (str == NULL) return NULL;
1187 const int str_len = (int)strlen(str);
1188 if (str_len > Symbol::max_length()) {
1189 // It's impossible to create this class; the name cannot fit
1190 // into the constant pool.
1191 return NULL;
1192 }
1193 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len, CHECK_NULL);
1195 // Security Note:
1196 // The Java level wrapper will perform the necessary security check allowing
1197 // us to pass the NULL as the initiating class loader.
1198 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1199 if (UsePerfData) {
1200 is_lock_held_by_thread(h_loader,
1201 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1202 THREAD);
1203 }
1205 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1206 h_loader,
1207 Handle(),
1208 CHECK_NULL);
1209 #if INCLUDE_CDS
1210 if (k == NULL) {
1211 // If the class is not already loaded, try to see if it's in the shared
1212 // archive for the current classloader (h_loader).
1213 instanceKlassHandle ik = SystemDictionaryShared::find_or_load_shared_class(
1214 klass_name, h_loader, CHECK_NULL);
1215 k = ik();
1216 }
1217 #endif
1218 return (k == NULL) ? NULL :
1219 (jclass) JNIHandles::make_local(env, k->java_mirror());
1220 JVM_END
1223 // Reflection support //////////////////////////////////////////////////////////////////////////////
1225 JVM_ENTRY(jstring, JVM_GetClassName(JNIEnv *env, jclass cls))
1226 assert (cls != NULL, "illegal class");
1227 JVMWrapper("JVM_GetClassName");
1228 JvmtiVMObjectAllocEventCollector oam;
1229 ResourceMark rm(THREAD);
1230 const char* name;
1231 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1232 name = type2name(java_lang_Class::primitive_type(JNIHandles::resolve(cls)));
1233 } else {
1234 // Consider caching interned string in Klass
1235 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1236 assert(k->is_klass(), "just checking");
1237 name = k->external_name();
1238 }
1239 oop result = StringTable::intern((char*) name, CHECK_NULL);
1240 return (jstring) JNIHandles::make_local(env, result);
1241 JVM_END
1244 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1245 JVMWrapper("JVM_GetClassInterfaces");
1246 JvmtiVMObjectAllocEventCollector oam;
1247 oop mirror = JNIHandles::resolve_non_null(cls);
1249 // Special handling for primitive objects
1250 if (java_lang_Class::is_primitive(mirror)) {
1251 // Primitive objects does not have any interfaces
1252 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1253 return (jobjectArray) JNIHandles::make_local(env, r);
1254 }
1256 KlassHandle klass(thread, java_lang_Class::as_Klass(mirror));
1257 // Figure size of result array
1258 int size;
1259 if (klass->oop_is_instance()) {
1260 size = InstanceKlass::cast(klass())->local_interfaces()->length();
1261 } else {
1262 assert(klass->oop_is_objArray() || klass->oop_is_typeArray(), "Illegal mirror klass");
1263 size = 2;
1264 }
1266 // Allocate result array
1267 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1268 objArrayHandle result (THREAD, r);
1269 // Fill in result
1270 if (klass->oop_is_instance()) {
1271 // Regular instance klass, fill in all local interfaces
1272 for (int index = 0; index < size; index++) {
1273 Klass* k = InstanceKlass::cast(klass())->local_interfaces()->at(index);
1274 result->obj_at_put(index, k->java_mirror());
1275 }
1276 } else {
1277 // All arrays implement java.lang.Cloneable and java.io.Serializable
1278 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1279 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1280 }
1281 return (jobjectArray) JNIHandles::make_local(env, result());
1282 JVM_END
1285 JVM_ENTRY(jobject, JVM_GetClassLoader(JNIEnv *env, jclass cls))
1286 JVMWrapper("JVM_GetClassLoader");
1287 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1288 return NULL;
1289 }
1290 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1291 oop loader = k->class_loader();
1292 return JNIHandles::make_local(env, loader);
1293 JVM_END
1296 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1297 JVMWrapper("JVM_IsInterface");
1298 oop mirror = JNIHandles::resolve_non_null(cls);
1299 if (java_lang_Class::is_primitive(mirror)) {
1300 return JNI_FALSE;
1301 }
1302 Klass* k = java_lang_Class::as_Klass(mirror);
1303 jboolean result = k->is_interface();
1304 assert(!result || k->oop_is_instance(),
1305 "all interfaces are instance types");
1306 // The compiler intrinsic for isInterface tests the
1307 // Klass::_access_flags bits in the same way.
1308 return result;
1309 JVM_END
1312 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1313 JVMWrapper("JVM_GetClassSigners");
1314 JvmtiVMObjectAllocEventCollector oam;
1315 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1316 // There are no signers for primitive types
1317 return NULL;
1318 }
1320 objArrayOop signers = java_lang_Class::signers(JNIHandles::resolve_non_null(cls));
1322 // If there are no signers set in the class, or if the class
1323 // is an array, return NULL.
1324 if (signers == NULL) return NULL;
1326 // copy of the signers array
1327 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1328 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1329 for (int index = 0; index < signers->length(); index++) {
1330 signers_copy->obj_at_put(index, signers->obj_at(index));
1331 }
1333 // return the copy
1334 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1335 JVM_END
1338 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1339 JVMWrapper("JVM_SetClassSigners");
1340 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1341 // This call is ignored for primitive types and arrays.
1342 // Signers are only set once, ClassLoader.java, and thus shouldn't
1343 // be called with an array. Only the bootstrap loader creates arrays.
1344 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1345 if (k->oop_is_instance()) {
1346 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1347 }
1348 }
1349 JVM_END
1352 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1353 JVMWrapper("JVM_GetProtectionDomain");
1354 if (JNIHandles::resolve(cls) == NULL) {
1355 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1356 }
1358 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1359 // Primitive types does not have a protection domain.
1360 return NULL;
1361 }
1363 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1364 return (jobject) JNIHandles::make_local(env, pd);
1365 JVM_END
1368 static bool is_authorized(Handle context, instanceKlassHandle klass, TRAPS) {
1369 // If there is a security manager and protection domain, check the access
1370 // in the protection domain, otherwise it is authorized.
1371 if (java_lang_System::has_security_manager()) {
1373 // For bootstrapping, if pd implies method isn't in the JDK, allow
1374 // this context to revert to older behavior.
1375 // In this case the isAuthorized field in AccessControlContext is also not
1376 // present.
1377 if (Universe::protection_domain_implies_method() == NULL) {
1378 return true;
1379 }
1381 // Whitelist certain access control contexts
1382 if (java_security_AccessControlContext::is_authorized(context)) {
1383 return true;
1384 }
1386 oop prot = klass->protection_domain();
1387 if (prot != NULL) {
1388 // Call pd.implies(new SecurityPermission("createAccessControlContext"))
1389 // in the new wrapper.
1390 methodHandle m(THREAD, Universe::protection_domain_implies_method());
1391 Handle h_prot(THREAD, prot);
1392 JavaValue result(T_BOOLEAN);
1393 JavaCallArguments args(h_prot);
1394 JavaCalls::call(&result, m, &args, CHECK_false);
1395 return (result.get_jboolean() != 0);
1396 }
1397 }
1398 return true;
1399 }
1401 // Create an AccessControlContext with a protection domain with null codesource
1402 // and null permissions - which gives no permissions.
1403 oop create_dummy_access_control_context(TRAPS) {
1404 InstanceKlass* pd_klass = InstanceKlass::cast(SystemDictionary::ProtectionDomain_klass());
1405 Handle obj = pd_klass->allocate_instance_handle(CHECK_NULL);
1406 // Call constructor ProtectionDomain(null, null);
1407 JavaValue result(T_VOID);
1408 JavaCalls::call_special(&result, obj, KlassHandle(THREAD, pd_klass),
1409 vmSymbols::object_initializer_name(),
1410 vmSymbols::codesource_permissioncollection_signature(),
1411 Handle(), Handle(), CHECK_NULL);
1413 // new ProtectionDomain[] {pd};
1414 objArrayOop context = oopFactory::new_objArray(pd_klass, 1, CHECK_NULL);
1415 context->obj_at_put(0, obj());
1417 // new AccessControlContext(new ProtectionDomain[] {pd})
1418 objArrayHandle h_context(THREAD, context);
1419 oop acc = java_security_AccessControlContext::create(h_context, false, Handle(), CHECK_NULL);
1420 return acc;
1421 }
1423 JVM_ENTRY(jobject, JVM_DoPrivileged(JNIEnv *env, jclass cls, jobject action, jobject context, jboolean wrapException))
1424 JVMWrapper("JVM_DoPrivileged");
1426 if (action == NULL) {
1427 THROW_MSG_0(vmSymbols::java_lang_NullPointerException(), "Null action");
1428 }
1430 // Compute the frame initiating the do privileged operation and setup the privileged stack
1431 vframeStream vfst(thread);
1432 vfst.security_get_caller_frame(1);
1434 if (vfst.at_end()) {
1435 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "no caller?");
1436 }
1438 Method* method = vfst.method();
1439 instanceKlassHandle klass (THREAD, method->method_holder());
1441 // Check that action object understands "Object run()"
1442 Handle h_context;
1443 if (context != NULL) {
1444 h_context = Handle(THREAD, JNIHandles::resolve(context));
1445 bool authorized = is_authorized(h_context, klass, CHECK_NULL);
1446 if (!authorized) {
1447 // Create an unprivileged access control object and call it's run function
1448 // instead.
1449 oop noprivs = create_dummy_access_control_context(CHECK_NULL);
1450 h_context = Handle(THREAD, noprivs);
1451 }
1452 }
1454 // Check that action object understands "Object run()"
1455 Handle object (THREAD, JNIHandles::resolve(action));
1457 // get run() method
1458 Method* m_oop = object->klass()->uncached_lookup_method(
1459 vmSymbols::run_method_name(),
1460 vmSymbols::void_object_signature(),
1461 Klass::find_overpass);
1462 methodHandle m (THREAD, m_oop);
1463 if (m.is_null() || !m->is_method() || !m()->is_public() || m()->is_static()) {
1464 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "No run method");
1465 }
1467 // Stack allocated list of privileged stack elements
1468 PrivilegedElement pi;
1469 if (!vfst.at_end()) {
1470 pi.initialize(&vfst, h_context(), thread->privileged_stack_top(), CHECK_NULL);
1471 thread->set_privileged_stack_top(&pi);
1472 }
1475 // invoke the Object run() in the action object. We cannot use call_interface here, since the static type
1476 // is not really known - it is either java.security.PrivilegedAction or java.security.PrivilegedExceptionAction
1477 Handle pending_exception;
1478 JavaValue result(T_OBJECT);
1479 JavaCallArguments args(object);
1480 JavaCalls::call(&result, m, &args, THREAD);
1482 // done with action, remove ourselves from the list
1483 if (!vfst.at_end()) {
1484 assert(thread->privileged_stack_top() != NULL && thread->privileged_stack_top() == &pi, "wrong top element");
1485 thread->set_privileged_stack_top(thread->privileged_stack_top()->next());
1486 }
1488 if (HAS_PENDING_EXCEPTION) {
1489 pending_exception = Handle(THREAD, PENDING_EXCEPTION);
1490 CLEAR_PENDING_EXCEPTION;
1491 // JVMTI has already reported the pending exception
1492 // JVMTI internal flag reset is needed in order to report PrivilegedActionException
1493 if (THREAD->is_Java_thread()) {
1494 JvmtiExport::clear_detected_exception((JavaThread*) THREAD);
1495 }
1496 if ( pending_exception->is_a(SystemDictionary::Exception_klass()) &&
1497 !pending_exception->is_a(SystemDictionary::RuntimeException_klass())) {
1498 // Throw a java.security.PrivilegedActionException(Exception e) exception
1499 JavaCallArguments args(pending_exception);
1500 THROW_ARG_0(vmSymbols::java_security_PrivilegedActionException(),
1501 vmSymbols::exception_void_signature(),
1502 &args);
1503 }
1504 }
1506 if (pending_exception.not_null()) THROW_OOP_0(pending_exception());
1507 return JNIHandles::make_local(env, (oop) result.get_jobject());
1508 JVM_END
1511 // Returns the inherited_access_control_context field of the running thread.
1512 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1513 JVMWrapper("JVM_GetInheritedAccessControlContext");
1514 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1515 return JNIHandles::make_local(env, result);
1516 JVM_END
1518 class RegisterArrayForGC {
1519 private:
1520 JavaThread *_thread;
1521 public:
1522 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1523 _thread = thread;
1524 _thread->register_array_for_gc(array);
1525 }
1527 ~RegisterArrayForGC() {
1528 _thread->register_array_for_gc(NULL);
1529 }
1530 };
1533 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1534 JVMWrapper("JVM_GetStackAccessControlContext");
1535 if (!UsePrivilegedStack) return NULL;
1537 ResourceMark rm(THREAD);
1538 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1539 JvmtiVMObjectAllocEventCollector oam;
1541 // count the protection domains on the execution stack. We collapse
1542 // duplicate consecutive protection domains into a single one, as
1543 // well as stopping when we hit a privileged frame.
1545 // Use vframeStream to iterate through Java frames
1546 vframeStream vfst(thread);
1548 oop previous_protection_domain = NULL;
1549 Handle privileged_context(thread, NULL);
1550 bool is_privileged = false;
1551 oop protection_domain = NULL;
1553 for(; !vfst.at_end(); vfst.next()) {
1554 // get method of frame
1555 Method* method = vfst.method();
1556 intptr_t* frame_id = vfst.frame_id();
1558 // check the privileged frames to see if we have a match
1559 if (thread->privileged_stack_top() && thread->privileged_stack_top()->frame_id() == frame_id) {
1560 // this frame is privileged
1561 is_privileged = true;
1562 privileged_context = Handle(thread, thread->privileged_stack_top()->privileged_context());
1563 protection_domain = thread->privileged_stack_top()->protection_domain();
1564 } else {
1565 protection_domain = method->method_holder()->protection_domain();
1566 }
1568 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1569 local_array->push(protection_domain);
1570 previous_protection_domain = protection_domain;
1571 }
1573 if (is_privileged) break;
1574 }
1577 // either all the domains on the stack were system domains, or
1578 // we had a privileged system domain
1579 if (local_array->is_empty()) {
1580 if (is_privileged && privileged_context.is_null()) return NULL;
1582 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1583 return JNIHandles::make_local(env, result);
1584 }
1586 // the resource area must be registered in case of a gc
1587 RegisterArrayForGC ragc(thread, local_array);
1588 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1589 local_array->length(), CHECK_NULL);
1590 objArrayHandle h_context(thread, context);
1591 for (int index = 0; index < local_array->length(); index++) {
1592 h_context->obj_at_put(index, local_array->at(index));
1593 }
1595 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1597 return JNIHandles::make_local(env, result);
1598 JVM_END
1601 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1602 JVMWrapper("JVM_IsArrayClass");
1603 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1604 return (k != NULL) && k->oop_is_array() ? true : false;
1605 JVM_END
1608 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1609 JVMWrapper("JVM_IsPrimitiveClass");
1610 oop mirror = JNIHandles::resolve_non_null(cls);
1611 return (jboolean) java_lang_Class::is_primitive(mirror);
1612 JVM_END
1615 JVM_ENTRY(jclass, JVM_GetComponentType(JNIEnv *env, jclass cls))
1616 JVMWrapper("JVM_GetComponentType");
1617 oop mirror = JNIHandles::resolve_non_null(cls);
1618 oop result = Reflection::array_component_type(mirror, CHECK_NULL);
1619 return (jclass) JNIHandles::make_local(env, result);
1620 JVM_END
1623 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1624 JVMWrapper("JVM_GetClassModifiers");
1625 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1626 // Primitive type
1627 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1628 }
1630 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1631 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1632 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1633 return k->modifier_flags();
1634 JVM_END
1637 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1639 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1640 JvmtiVMObjectAllocEventCollector oam;
1641 // ofClass is a reference to a java_lang_Class object. The mirror object
1642 // of an InstanceKlass
1644 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1645 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1646 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1647 return (jobjectArray)JNIHandles::make_local(env, result);
1648 }
1650 instanceKlassHandle k(thread, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1651 InnerClassesIterator iter(k);
1653 if (iter.length() == 0) {
1654 // Neither an inner nor outer class
1655 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1656 return (jobjectArray)JNIHandles::make_local(env, result);
1657 }
1659 // find inner class info
1660 constantPoolHandle cp(thread, k->constants());
1661 int length = iter.length();
1663 // Allocate temp. result array
1664 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1665 objArrayHandle result (THREAD, r);
1666 int members = 0;
1668 for (; !iter.done(); iter.next()) {
1669 int ioff = iter.inner_class_info_index();
1670 int ooff = iter.outer_class_info_index();
1672 if (ioff != 0 && ooff != 0) {
1673 // Check to see if the name matches the class we're looking for
1674 // before attempting to find the class.
1675 if (cp->klass_name_at_matches(k, ooff)) {
1676 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1677 if (outer_klass == k()) {
1678 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1679 instanceKlassHandle inner_klass (THREAD, ik);
1681 // Throws an exception if outer klass has not declared k as
1682 // an inner klass
1683 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1685 result->obj_at_put(members, inner_klass->java_mirror());
1686 members++;
1687 }
1688 }
1689 }
1690 }
1692 if (members != length) {
1693 // Return array of right length
1694 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1695 for(int i = 0; i < members; i++) {
1696 res->obj_at_put(i, result->obj_at(i));
1697 }
1698 return (jobjectArray)JNIHandles::make_local(env, res);
1699 }
1701 return (jobjectArray)JNIHandles::make_local(env, result());
1702 JVM_END
1705 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1706 {
1707 // ofClass is a reference to a java_lang_Class object.
1708 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1709 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_instance()) {
1710 return NULL;
1711 }
1713 bool inner_is_member = false;
1714 Klass* outer_klass
1715 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1716 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1717 if (outer_klass == NULL) return NULL; // already a top-level class
1718 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1719 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1720 }
1721 JVM_END
1723 // should be in InstanceKlass.cpp, but is here for historical reasons
1724 Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle k,
1725 bool* inner_is_member,
1726 TRAPS) {
1727 Thread* thread = THREAD;
1728 InnerClassesIterator iter(k);
1729 if (iter.length() == 0) {
1730 // No inner class info => no declaring class
1731 return NULL;
1732 }
1734 constantPoolHandle i_cp(thread, k->constants());
1736 bool found = false;
1737 Klass* ok;
1738 instanceKlassHandle outer_klass;
1739 *inner_is_member = false;
1741 // Find inner_klass attribute
1742 for (; !iter.done() && !found; iter.next()) {
1743 int ioff = iter.inner_class_info_index();
1744 int ooff = iter.outer_class_info_index();
1745 int noff = iter.inner_name_index();
1746 if (ioff != 0) {
1747 // Check to see if the name matches the class we're looking for
1748 // before attempting to find the class.
1749 if (i_cp->klass_name_at_matches(k, ioff)) {
1750 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_NULL);
1751 found = (k() == inner_klass);
1752 if (found && ooff != 0) {
1753 ok = i_cp->klass_at(ooff, CHECK_NULL);
1754 outer_klass = instanceKlassHandle(thread, ok);
1755 *inner_is_member = true;
1756 }
1757 }
1758 }
1759 }
1761 if (found && outer_klass.is_null()) {
1762 // It may be anonymous; try for that.
1763 int encl_method_class_idx = k->enclosing_method_class_index();
1764 if (encl_method_class_idx != 0) {
1765 ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
1766 outer_klass = instanceKlassHandle(thread, ok);
1767 *inner_is_member = false;
1768 }
1769 }
1771 // If no inner class attribute found for this class.
1772 if (outer_klass.is_null()) return NULL;
1774 // Throws an exception if outer klass has not declared k as an inner klass
1775 // We need evidence that each klass knows about the other, or else
1776 // the system could allow a spoof of an inner class to gain access rights.
1777 Reflection::check_for_inner_class(outer_klass, k, *inner_is_member, CHECK_NULL);
1778 return outer_klass();
1779 }
1781 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1782 assert (cls != NULL, "illegal class");
1783 JVMWrapper("JVM_GetClassSignature");
1784 JvmtiVMObjectAllocEventCollector oam;
1785 ResourceMark rm(THREAD);
1786 // Return null for arrays and primatives
1787 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1788 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1789 if (k->oop_is_instance()) {
1790 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1791 if (sym == NULL) return NULL;
1792 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1793 return (jstring) JNIHandles::make_local(env, str());
1794 }
1795 }
1796 return NULL;
1797 JVM_END
1800 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1801 assert (cls != NULL, "illegal class");
1802 JVMWrapper("JVM_GetClassAnnotations");
1804 // Return null for arrays and primitives
1805 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1806 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1807 if (k->oop_is_instance()) {
1808 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1809 return (jbyteArray) JNIHandles::make_local(env, a);
1810 }
1811 }
1812 return NULL;
1813 JVM_END
1816 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1817 // some of this code was adapted from from jni_FromReflectedField
1819 oop reflected = JNIHandles::resolve_non_null(field);
1820 oop mirror = java_lang_reflect_Field::clazz(reflected);
1821 Klass* k = java_lang_Class::as_Klass(mirror);
1822 int slot = java_lang_reflect_Field::slot(reflected);
1823 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1825 KlassHandle kh(THREAD, k);
1826 intptr_t offset = InstanceKlass::cast(kh())->field_offset(slot);
1828 if (modifiers & JVM_ACC_STATIC) {
1829 // for static fields we only look in the current class
1830 if (!InstanceKlass::cast(kh())->find_local_field_from_offset(offset, true, &fd)) {
1831 assert(false, "cannot find static field");
1832 return false;
1833 }
1834 } else {
1835 // for instance fields we start with the current class and work
1836 // our way up through the superclass chain
1837 if (!InstanceKlass::cast(kh())->find_field_from_offset(offset, false, &fd)) {
1838 assert(false, "cannot find instance field");
1839 return false;
1840 }
1841 }
1842 return true;
1843 }
1845 JVM_ENTRY(jbyteArray, JVM_GetFieldAnnotations(JNIEnv *env, jobject field))
1846 // field is a handle to a java.lang.reflect.Field object
1847 assert(field != NULL, "illegal field");
1848 JVMWrapper("JVM_GetFieldAnnotations");
1850 fieldDescriptor fd;
1851 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1852 if (!gotFd) {
1853 return NULL;
1854 }
1856 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.annotations(), THREAD));
1857 JVM_END
1860 static Method* jvm_get_method_common(jobject method) {
1861 // some of this code was adapted from from jni_FromReflectedMethod
1863 oop reflected = JNIHandles::resolve_non_null(method);
1864 oop mirror = NULL;
1865 int slot = 0;
1867 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1868 mirror = java_lang_reflect_Constructor::clazz(reflected);
1869 slot = java_lang_reflect_Constructor::slot(reflected);
1870 } else {
1871 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1872 "wrong type");
1873 mirror = java_lang_reflect_Method::clazz(reflected);
1874 slot = java_lang_reflect_Method::slot(reflected);
1875 }
1876 Klass* k = java_lang_Class::as_Klass(mirror);
1878 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1879 assert(m != NULL, "cannot find method");
1880 return m; // caller has to deal with NULL in product mode
1881 }
1884 JVM_ENTRY(jbyteArray, JVM_GetMethodAnnotations(JNIEnv *env, jobject method))
1885 JVMWrapper("JVM_GetMethodAnnotations");
1887 // method is a handle to a java.lang.reflect.Method object
1888 Method* m = jvm_get_method_common(method);
1889 if (m == NULL) {
1890 return NULL;
1891 }
1893 return (jbyteArray) JNIHandles::make_local(env,
1894 Annotations::make_java_array(m->annotations(), THREAD));
1895 JVM_END
1898 JVM_ENTRY(jbyteArray, JVM_GetMethodDefaultAnnotationValue(JNIEnv *env, jobject method))
1899 JVMWrapper("JVM_GetMethodDefaultAnnotationValue");
1901 // method is a handle to a java.lang.reflect.Method object
1902 Method* m = jvm_get_method_common(method);
1903 if (m == NULL) {
1904 return NULL;
1905 }
1907 return (jbyteArray) JNIHandles::make_local(env,
1908 Annotations::make_java_array(m->annotation_default(), THREAD));
1909 JVM_END
1912 JVM_ENTRY(jbyteArray, JVM_GetMethodParameterAnnotations(JNIEnv *env, jobject method))
1913 JVMWrapper("JVM_GetMethodParameterAnnotations");
1915 // method is a handle to a java.lang.reflect.Method object
1916 Method* m = jvm_get_method_common(method);
1917 if (m == NULL) {
1918 return NULL;
1919 }
1921 return (jbyteArray) JNIHandles::make_local(env,
1922 Annotations::make_java_array(m->parameter_annotations(), THREAD));
1923 JVM_END
1925 /* Type use annotations support (JDK 1.8) */
1927 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1928 assert (cls != NULL, "illegal class");
1929 JVMWrapper("JVM_GetClassTypeAnnotations");
1930 ResourceMark rm(THREAD);
1931 // Return null for arrays and primitives
1932 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1933 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1934 if (k->oop_is_instance()) {
1935 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1936 if (type_annotations != NULL) {
1937 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1938 return (jbyteArray) JNIHandles::make_local(env, a);
1939 }
1940 }
1941 }
1942 return NULL;
1943 JVM_END
1945 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1946 assert (method != NULL, "illegal method");
1947 JVMWrapper("JVM_GetMethodTypeAnnotations");
1949 // method is a handle to a java.lang.reflect.Method object
1950 Method* m = jvm_get_method_common(method);
1951 if (m == NULL) {
1952 return NULL;
1953 }
1955 AnnotationArray* type_annotations = m->type_annotations();
1956 if (type_annotations != NULL) {
1957 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1958 return (jbyteArray) JNIHandles::make_local(env, a);
1959 }
1961 return NULL;
1962 JVM_END
1964 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1965 assert (field != NULL, "illegal field");
1966 JVMWrapper("JVM_GetFieldTypeAnnotations");
1968 fieldDescriptor fd;
1969 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1970 if (!gotFd) {
1971 return NULL;
1972 }
1974 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1975 JVM_END
1977 static void bounds_check(constantPoolHandle cp, jint index, TRAPS) {
1978 if (!cp->is_within_bounds(index)) {
1979 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1980 }
1981 }
1983 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1984 {
1985 JVMWrapper("JVM_GetMethodParameters");
1986 // method is a handle to a java.lang.reflect.Method object
1987 Method* method_ptr = jvm_get_method_common(method);
1988 methodHandle mh (THREAD, method_ptr);
1989 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1990 const int num_params = mh->method_parameters_length();
1992 if (0 != num_params) {
1993 // make sure all the symbols are properly formatted
1994 for (int i = 0; i < num_params; i++) {
1995 MethodParametersElement* params = mh->method_parameters_start();
1996 int index = params[i].name_cp_index;
1997 bounds_check(mh->constants(), index, CHECK_NULL);
1999 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
2000 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
2001 "Wrong type at constant pool index");
2002 }
2004 }
2006 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
2007 objArrayHandle result (THREAD, result_oop);
2009 for (int i = 0; i < num_params; i++) {
2010 MethodParametersElement* params = mh->method_parameters_start();
2011 // For a 0 index, give a NULL symbol
2012 Symbol* sym = 0 != params[i].name_cp_index ?
2013 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
2014 int flags = params[i].flags;
2015 oop param = Reflection::new_parameter(reflected_method, i, sym,
2016 flags, CHECK_NULL);
2017 result->obj_at_put(i, param);
2018 }
2019 return (jobjectArray)JNIHandles::make_local(env, result());
2020 } else {
2021 return (jobjectArray)NULL;
2022 }
2023 }
2024 JVM_END
2026 // New (JDK 1.4) reflection implementation /////////////////////////////////////
2028 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2029 {
2030 JVMWrapper("JVM_GetClassDeclaredFields");
2031 JvmtiVMObjectAllocEventCollector oam;
2033 // Exclude primitive types and array types
2034 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
2035 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
2036 // Return empty array
2037 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
2038 return (jobjectArray) JNIHandles::make_local(env, res);
2039 }
2041 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
2042 constantPoolHandle cp(THREAD, k->constants());
2044 // Ensure class is linked
2045 k->link_class(CHECK_NULL);
2047 // 4496456 We need to filter out java.lang.Throwable.backtrace
2048 bool skip_backtrace = false;
2050 // Allocate result
2051 int num_fields;
2053 if (publicOnly) {
2054 num_fields = 0;
2055 for (JavaFieldStream fs(k()); !fs.done(); fs.next()) {
2056 if (fs.access_flags().is_public()) ++num_fields;
2057 }
2058 } else {
2059 num_fields = k->java_fields_count();
2061 if (k() == SystemDictionary::Throwable_klass()) {
2062 num_fields--;
2063 skip_backtrace = true;
2064 }
2065 }
2067 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
2068 objArrayHandle result (THREAD, r);
2070 int out_idx = 0;
2071 fieldDescriptor fd;
2072 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
2073 if (skip_backtrace) {
2074 // 4496456 skip java.lang.Throwable.backtrace
2075 int offset = fs.offset();
2076 if (offset == java_lang_Throwable::get_backtrace_offset()) continue;
2077 }
2079 if (!publicOnly || fs.access_flags().is_public()) {
2080 fd.reinitialize(k(), fs.index());
2081 oop field = Reflection::new_field(&fd, UseNewReflection, CHECK_NULL);
2082 result->obj_at_put(out_idx, field);
2083 ++out_idx;
2084 }
2085 }
2086 assert(out_idx == num_fields, "just checking");
2087 return (jobjectArray) JNIHandles::make_local(env, result());
2088 }
2089 JVM_END
2091 static bool select_method(methodHandle method, bool want_constructor) {
2092 if (want_constructor) {
2093 return (method->is_initializer() && !method->is_static());
2094 } else {
2095 return (!method->is_initializer() && !method->is_overpass());
2096 }
2097 }
2099 static jobjectArray get_class_declared_methods_helper(
2100 JNIEnv *env,
2101 jclass ofClass, jboolean publicOnly,
2102 bool want_constructor,
2103 Klass* klass, TRAPS) {
2105 JvmtiVMObjectAllocEventCollector oam;
2107 // Exclude primitive types and array types
2108 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
2109 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->oop_is_array()) {
2110 // Return empty array
2111 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
2112 return (jobjectArray) JNIHandles::make_local(env, res);
2113 }
2115 instanceKlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
2117 // Ensure class is linked
2118 k->link_class(CHECK_NULL);
2120 Array<Method*>* methods = k->methods();
2121 int methods_length = methods->length();
2123 // Save original method_idnum in case of redefinition, which can change
2124 // the idnum of obsolete methods. The new method will have the same idnum
2125 // but if we refresh the methods array, the counts will be wrong.
2126 ResourceMark rm(THREAD);
2127 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
2128 int num_methods = 0;
2130 for (int i = 0; i < methods_length; i++) {
2131 methodHandle method(THREAD, methods->at(i));
2132 if (select_method(method, want_constructor)) {
2133 if (!publicOnly || method->is_public()) {
2134 idnums->push(method->method_idnum());
2135 ++num_methods;
2136 }
2137 }
2138 }
2140 // Allocate result
2141 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
2142 objArrayHandle result (THREAD, r);
2144 // Now just put the methods that we selected above, but go by their idnum
2145 // in case of redefinition. The methods can be redefined at any safepoint,
2146 // so above when allocating the oop array and below when creating reflect
2147 // objects.
2148 for (int i = 0; i < num_methods; i++) {
2149 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
2150 if (method.is_null()) {
2151 // Method may have been deleted and seems this API can handle null
2152 // Otherwise should probably put a method that throws NSME
2153 result->obj_at_put(i, NULL);
2154 } else {
2155 oop m;
2156 if (want_constructor) {
2157 m = Reflection::new_constructor(method, CHECK_NULL);
2158 } else {
2159 m = Reflection::new_method(method, UseNewReflection, false, CHECK_NULL);
2160 }
2161 result->obj_at_put(i, m);
2162 }
2163 }
2165 return (jobjectArray) JNIHandles::make_local(env, result());
2166 }
2168 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2169 {
2170 JVMWrapper("JVM_GetClassDeclaredMethods");
2171 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2172 /*want_constructor*/ false,
2173 SystemDictionary::reflect_Method_klass(), THREAD);
2174 }
2175 JVM_END
2177 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2178 {
2179 JVMWrapper("JVM_GetClassDeclaredConstructors");
2180 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2181 /*want_constructor*/ true,
2182 SystemDictionary::reflect_Constructor_klass(), THREAD);
2183 }
2184 JVM_END
2186 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
2187 {
2188 JVMWrapper("JVM_GetClassAccessFlags");
2189 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2190 // Primitive type
2191 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
2192 }
2194 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2195 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
2196 }
2197 JVM_END
2200 // Constant pool access //////////////////////////////////////////////////////////
2202 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2203 {
2204 JVMWrapper("JVM_GetClassConstantPool");
2205 JvmtiVMObjectAllocEventCollector oam;
2207 // Return null for primitives and arrays
2208 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2209 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2210 if (k->oop_is_instance()) {
2211 instanceKlassHandle k_h(THREAD, k);
2212 Handle jcp = sun_reflect_ConstantPool::create(CHECK_NULL);
2213 sun_reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2214 return JNIHandles::make_local(jcp());
2215 }
2216 }
2217 return NULL;
2218 }
2219 JVM_END
2222 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2223 {
2224 JVMWrapper("JVM_ConstantPoolGetSize");
2225 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2226 return cp->length();
2227 }
2228 JVM_END
2231 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2232 {
2233 JVMWrapper("JVM_ConstantPoolGetClassAt");
2234 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2235 bounds_check(cp, index, CHECK_NULL);
2236 constantTag tag = cp->tag_at(index);
2237 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2238 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2239 }
2240 Klass* k = cp->klass_at(index, CHECK_NULL);
2241 return (jclass) JNIHandles::make_local(k->java_mirror());
2242 }
2243 JVM_END
2245 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2246 {
2247 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2248 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2249 bounds_check(cp, index, CHECK_NULL);
2250 constantTag tag = cp->tag_at(index);
2251 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2252 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2253 }
2254 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2255 if (k == NULL) return NULL;
2256 return (jclass) JNIHandles::make_local(k->java_mirror());
2257 }
2258 JVM_END
2260 static jobject get_method_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2261 constantTag tag = cp->tag_at(index);
2262 if (!tag.is_method() && !tag.is_interface_method()) {
2263 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2264 }
2265 int klass_ref = cp->uncached_klass_ref_index_at(index);
2266 Klass* k_o;
2267 if (force_resolution) {
2268 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2269 } else {
2270 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2271 if (k_o == NULL) return NULL;
2272 }
2273 instanceKlassHandle k(THREAD, k_o);
2274 Symbol* name = cp->uncached_name_ref_at(index);
2275 Symbol* sig = cp->uncached_signature_ref_at(index);
2276 methodHandle m (THREAD, k->find_method(name, sig));
2277 if (m.is_null()) {
2278 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2279 }
2280 oop method;
2281 if (!m->is_initializer() || m->is_static()) {
2282 method = Reflection::new_method(m, true, true, CHECK_NULL);
2283 } else {
2284 method = Reflection::new_constructor(m, CHECK_NULL);
2285 }
2286 return JNIHandles::make_local(method);
2287 }
2289 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2290 {
2291 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2292 JvmtiVMObjectAllocEventCollector oam;
2293 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2294 bounds_check(cp, index, CHECK_NULL);
2295 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2296 return res;
2297 }
2298 JVM_END
2300 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2301 {
2302 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2303 JvmtiVMObjectAllocEventCollector oam;
2304 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2305 bounds_check(cp, index, CHECK_NULL);
2306 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2307 return res;
2308 }
2309 JVM_END
2311 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2312 constantTag tag = cp->tag_at(index);
2313 if (!tag.is_field()) {
2314 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2315 }
2316 int klass_ref = cp->uncached_klass_ref_index_at(index);
2317 Klass* k_o;
2318 if (force_resolution) {
2319 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2320 } else {
2321 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2322 if (k_o == NULL) return NULL;
2323 }
2324 instanceKlassHandle k(THREAD, k_o);
2325 Symbol* name = cp->uncached_name_ref_at(index);
2326 Symbol* sig = cp->uncached_signature_ref_at(index);
2327 fieldDescriptor fd;
2328 Klass* target_klass = k->find_field(name, sig, &fd);
2329 if (target_klass == NULL) {
2330 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2331 }
2332 oop field = Reflection::new_field(&fd, true, CHECK_NULL);
2333 return JNIHandles::make_local(field);
2334 }
2336 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2337 {
2338 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2339 JvmtiVMObjectAllocEventCollector oam;
2340 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2341 bounds_check(cp, index, CHECK_NULL);
2342 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2343 return res;
2344 }
2345 JVM_END
2347 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2348 {
2349 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2350 JvmtiVMObjectAllocEventCollector oam;
2351 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2352 bounds_check(cp, index, CHECK_NULL);
2353 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2354 return res;
2355 }
2356 JVM_END
2358 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2359 {
2360 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2361 JvmtiVMObjectAllocEventCollector oam;
2362 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2363 bounds_check(cp, index, CHECK_NULL);
2364 constantTag tag = cp->tag_at(index);
2365 if (!tag.is_field_or_method()) {
2366 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2367 }
2368 int klass_ref = cp->uncached_klass_ref_index_at(index);
2369 Symbol* klass_name = cp->klass_name_at(klass_ref);
2370 Symbol* member_name = cp->uncached_name_ref_at(index);
2371 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2372 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2373 objArrayHandle dest(THREAD, dest_o);
2374 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2375 dest->obj_at_put(0, str());
2376 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2377 dest->obj_at_put(1, str());
2378 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2379 dest->obj_at_put(2, str());
2380 return (jobjectArray) JNIHandles::make_local(dest());
2381 }
2382 JVM_END
2384 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2385 {
2386 JVMWrapper("JVM_ConstantPoolGetIntAt");
2387 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2388 bounds_check(cp, index, CHECK_0);
2389 constantTag tag = cp->tag_at(index);
2390 if (!tag.is_int()) {
2391 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2392 }
2393 return cp->int_at(index);
2394 }
2395 JVM_END
2397 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2398 {
2399 JVMWrapper("JVM_ConstantPoolGetLongAt");
2400 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2401 bounds_check(cp, index, CHECK_(0L));
2402 constantTag tag = cp->tag_at(index);
2403 if (!tag.is_long()) {
2404 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2405 }
2406 return cp->long_at(index);
2407 }
2408 JVM_END
2410 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2411 {
2412 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2413 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2414 bounds_check(cp, index, CHECK_(0.0f));
2415 constantTag tag = cp->tag_at(index);
2416 if (!tag.is_float()) {
2417 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2418 }
2419 return cp->float_at(index);
2420 }
2421 JVM_END
2423 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2424 {
2425 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2426 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2427 bounds_check(cp, index, CHECK_(0.0));
2428 constantTag tag = cp->tag_at(index);
2429 if (!tag.is_double()) {
2430 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2431 }
2432 return cp->double_at(index);
2433 }
2434 JVM_END
2436 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2437 {
2438 JVMWrapper("JVM_ConstantPoolGetStringAt");
2439 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2440 bounds_check(cp, index, CHECK_NULL);
2441 constantTag tag = cp->tag_at(index);
2442 if (!tag.is_string()) {
2443 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2444 }
2445 oop str = cp->string_at(index, CHECK_NULL);
2446 return (jstring) JNIHandles::make_local(str);
2447 }
2448 JVM_END
2450 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2451 {
2452 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2453 JvmtiVMObjectAllocEventCollector oam;
2454 constantPoolHandle cp = constantPoolHandle(THREAD, sun_reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2455 bounds_check(cp, index, CHECK_NULL);
2456 constantTag tag = cp->tag_at(index);
2457 if (!tag.is_symbol()) {
2458 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2459 }
2460 Symbol* sym = cp->symbol_at(index);
2461 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2462 return (jstring) JNIHandles::make_local(str());
2463 }
2464 JVM_END
2467 // Assertion support. //////////////////////////////////////////////////////////
2469 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2470 JVMWrapper("JVM_DesiredAssertionStatus");
2471 assert(cls != NULL, "bad class");
2473 oop r = JNIHandles::resolve(cls);
2474 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2475 if (java_lang_Class::is_primitive(r)) return false;
2477 Klass* k = java_lang_Class::as_Klass(r);
2478 assert(k->oop_is_instance(), "must be an instance klass");
2479 if (! k->oop_is_instance()) return false;
2481 ResourceMark rm(THREAD);
2482 const char* name = k->name()->as_C_string();
2483 bool system_class = k->class_loader() == NULL;
2484 return JavaAssertions::enabled(name, system_class);
2486 JVM_END
2489 // Return a new AssertionStatusDirectives object with the fields filled in with
2490 // command-line assertion arguments (i.e., -ea, -da).
2491 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2492 JVMWrapper("JVM_AssertionStatusDirectives");
2493 JvmtiVMObjectAllocEventCollector oam;
2494 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2495 return JNIHandles::make_local(env, asd);
2496 JVM_END
2498 // Verification ////////////////////////////////////////////////////////////////////////////////
2500 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2502 // RedefineClasses support: bug 6214132 caused verification to fail.
2503 // All functions from this section should call the jvmtiThreadSate function:
2504 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2505 // The function returns a Klass* of the _scratch_class if the verifier
2506 // was invoked in the middle of the class redefinition.
2507 // Otherwise it returns its argument value which is the _the_class Klass*.
2508 // Please, refer to the description in the jvmtiThreadSate.hpp.
2510 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2511 JVMWrapper("JVM_GetClassNameUTF");
2512 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2513 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2514 return k->name()->as_utf8();
2515 JVM_END
2518 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2519 JVMWrapper("JVM_GetClassCPTypes");
2520 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2521 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2522 // types will have length zero if this is not an InstanceKlass
2523 // (length is determined by call to JVM_GetClassCPEntriesCount)
2524 if (k->oop_is_instance()) {
2525 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2526 for (int index = cp->length() - 1; index >= 0; index--) {
2527 constantTag tag = cp->tag_at(index);
2528 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2529 }
2530 }
2531 JVM_END
2534 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2535 JVMWrapper("JVM_GetClassCPEntriesCount");
2536 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2537 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2538 if (!k->oop_is_instance())
2539 return 0;
2540 return InstanceKlass::cast(k)->constants()->length();
2541 JVM_END
2544 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2545 JVMWrapper("JVM_GetClassFieldsCount");
2546 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2547 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2548 if (!k->oop_is_instance())
2549 return 0;
2550 return InstanceKlass::cast(k)->java_fields_count();
2551 JVM_END
2554 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2555 JVMWrapper("JVM_GetClassMethodsCount");
2556 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2557 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2558 if (!k->oop_is_instance())
2559 return 0;
2560 return InstanceKlass::cast(k)->methods()->length();
2561 JVM_END
2564 // The following methods, used for the verifier, are never called with
2565 // array klasses, so a direct cast to InstanceKlass is safe.
2566 // Typically, these methods are called in a loop with bounds determined
2567 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2568 // zero for arrays.
2569 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2570 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2572 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2573 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2574 int length = method->checked_exceptions_length();
2575 if (length > 0) {
2576 CheckedExceptionElement* table= method->checked_exceptions_start();
2577 for (int i = 0; i < length; i++) {
2578 exceptions[i] = table[i].class_cp_index;
2579 }
2580 }
2581 JVM_END
2584 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2585 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2586 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2587 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2588 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2589 return method->checked_exceptions_length();
2590 JVM_END
2593 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2594 JVMWrapper("JVM_GetMethodIxByteCode");
2595 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2596 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2597 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2598 memcpy(code, method->code_base(), method->code_size());
2599 JVM_END
2602 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2603 JVMWrapper("JVM_GetMethodIxByteCodeLength");
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 return method->code_size();
2608 JVM_END
2611 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2612 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2613 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2614 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2615 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2616 ExceptionTable extable(method);
2617 entry->start_pc = extable.start_pc(entry_index);
2618 entry->end_pc = extable.end_pc(entry_index);
2619 entry->handler_pc = extable.handler_pc(entry_index);
2620 entry->catchType = extable.catch_type_index(entry_index);
2621 JVM_END
2624 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2625 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2626 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2627 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2628 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2629 return method->exception_table_length();
2630 JVM_END
2633 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2634 JVMWrapper("JVM_GetMethodIxModifiers");
2635 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2636 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2637 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2638 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2639 JVM_END
2642 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2643 JVMWrapper("JVM_GetFieldIxModifiers");
2644 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2645 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2646 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2647 JVM_END
2650 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2651 JVMWrapper("JVM_GetMethodIxLocalsCount");
2652 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2653 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2654 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2655 return method->max_locals();
2656 JVM_END
2659 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2660 JVMWrapper("JVM_GetMethodIxArgsSize");
2661 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2662 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2663 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2664 return method->size_of_parameters();
2665 JVM_END
2668 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2669 JVMWrapper("JVM_GetMethodIxMaxStack");
2670 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2671 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2672 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2673 return method->verifier_max_stack();
2674 JVM_END
2677 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2678 JVMWrapper("JVM_IsConstructorIx");
2679 ResourceMark rm(THREAD);
2680 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2681 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2682 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2683 return method->name() == vmSymbols::object_initializer_name();
2684 JVM_END
2687 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2688 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2689 ResourceMark rm(THREAD);
2690 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2691 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2692 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2693 return method->is_overpass();
2694 JVM_END
2696 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2697 JVMWrapper("JVM_GetMethodIxIxUTF");
2698 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2699 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2700 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2701 return method->name()->as_utf8();
2702 JVM_END
2705 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2706 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2707 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2708 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2709 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2710 return method->signature()->as_utf8();
2711 JVM_END
2713 /**
2714 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2715 * read entries in the constant pool. Since the old verifier always
2716 * works on a copy of the code, it will not see any rewriting that
2717 * may possibly occur in the middle of verification. So it is important
2718 * that nothing it calls tries to use the cpCache instead of the raw
2719 * constant pool, so we must use cp->uncached_x methods when appropriate.
2720 */
2721 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2722 JVMWrapper("JVM_GetCPFieldNameUTF");
2723 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2724 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2725 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2726 switch (cp->tag_at(cp_index).value()) {
2727 case JVM_CONSTANT_Fieldref:
2728 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2729 default:
2730 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2731 }
2732 ShouldNotReachHere();
2733 return NULL;
2734 JVM_END
2737 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2738 JVMWrapper("JVM_GetCPMethodNameUTF");
2739 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2740 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2741 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2742 switch (cp->tag_at(cp_index).value()) {
2743 case JVM_CONSTANT_InterfaceMethodref:
2744 case JVM_CONSTANT_Methodref:
2745 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2746 default:
2747 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2748 }
2749 ShouldNotReachHere();
2750 return NULL;
2751 JVM_END
2754 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2755 JVMWrapper("JVM_GetCPMethodSignatureUTF");
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_InterfaceMethodref:
2761 case JVM_CONSTANT_Methodref:
2762 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2763 default:
2764 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2765 }
2766 ShouldNotReachHere();
2767 return NULL;
2768 JVM_END
2771 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2772 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2773 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2774 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2775 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2776 switch (cp->tag_at(cp_index).value()) {
2777 case JVM_CONSTANT_Fieldref:
2778 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2779 default:
2780 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2781 }
2782 ShouldNotReachHere();
2783 return NULL;
2784 JVM_END
2787 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2788 JVMWrapper("JVM_GetCPClassNameUTF");
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 Symbol* classname = cp->klass_name_at(cp_index);
2793 return classname->as_utf8();
2794 JVM_END
2797 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2798 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2799 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2800 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2801 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2802 switch (cp->tag_at(cp_index).value()) {
2803 case JVM_CONSTANT_Fieldref: {
2804 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2805 Symbol* classname = cp->klass_name_at(class_index);
2806 return classname->as_utf8();
2807 }
2808 default:
2809 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2810 }
2811 ShouldNotReachHere();
2812 return NULL;
2813 JVM_END
2816 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2817 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2818 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2819 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2820 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2821 switch (cp->tag_at(cp_index).value()) {
2822 case JVM_CONSTANT_Methodref:
2823 case JVM_CONSTANT_InterfaceMethodref: {
2824 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2825 Symbol* classname = cp->klass_name_at(class_index);
2826 return classname->as_utf8();
2827 }
2828 default:
2829 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2830 }
2831 ShouldNotReachHere();
2832 return NULL;
2833 JVM_END
2836 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2837 JVMWrapper("JVM_GetCPFieldModifiers");
2838 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2839 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2840 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2841 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2842 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2843 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2844 switch (cp->tag_at(cp_index).value()) {
2845 case JVM_CONSTANT_Fieldref: {
2846 Symbol* name = cp->uncached_name_ref_at(cp_index);
2847 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2848 for (JavaFieldStream fs(k_called); !fs.done(); fs.next()) {
2849 if (fs.name() == name && fs.signature() == signature) {
2850 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2851 }
2852 }
2853 return -1;
2854 }
2855 default:
2856 fatal("JVM_GetCPFieldModifiers: illegal constant");
2857 }
2858 ShouldNotReachHere();
2859 return 0;
2860 JVM_END
2863 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2864 JVMWrapper("JVM_GetCPMethodModifiers");
2865 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2866 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2867 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2868 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2869 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2870 switch (cp->tag_at(cp_index).value()) {
2871 case JVM_CONSTANT_Methodref:
2872 case JVM_CONSTANT_InterfaceMethodref: {
2873 Symbol* name = cp->uncached_name_ref_at(cp_index);
2874 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2875 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2876 int methods_count = methods->length();
2877 for (int i = 0; i < methods_count; i++) {
2878 Method* method = methods->at(i);
2879 if (method->name() == name && method->signature() == signature) {
2880 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2881 }
2882 }
2883 return -1;
2884 }
2885 default:
2886 fatal("JVM_GetCPMethodModifiers: illegal constant");
2887 }
2888 ShouldNotReachHere();
2889 return 0;
2890 JVM_END
2893 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2895 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2896 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2897 JVM_END
2900 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2901 JVMWrapper("JVM_IsSameClassPackage");
2902 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2903 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2904 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2905 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2906 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2907 JVM_END
2910 // IO functions ////////////////////////////////////////////////////////////////////////////////////////
2912 JVM_LEAF(jint, JVM_Open(const char *fname, jint flags, jint mode))
2913 JVMWrapper2("JVM_Open (%s)", fname);
2915 //%note jvm_r6
2916 int result = os::open(fname, flags, mode);
2917 if (result >= 0) {
2918 return result;
2919 } else {
2920 switch(errno) {
2921 case EEXIST:
2922 return JVM_EEXIST;
2923 default:
2924 return -1;
2925 }
2926 }
2927 JVM_END
2930 JVM_LEAF(jint, JVM_Close(jint fd))
2931 JVMWrapper2("JVM_Close (0x%x)", fd);
2932 //%note jvm_r6
2933 return os::close(fd);
2934 JVM_END
2937 JVM_LEAF(jint, JVM_Read(jint fd, char *buf, jint nbytes))
2938 JVMWrapper2("JVM_Read (0x%x)", fd);
2940 //%note jvm_r6
2941 return (jint)os::restartable_read(fd, buf, nbytes);
2942 JVM_END
2945 JVM_LEAF(jint, JVM_Write(jint fd, char *buf, jint nbytes))
2946 JVMWrapper2("JVM_Write (0x%x)", fd);
2948 //%note jvm_r6
2949 return (jint)os::write(fd, buf, nbytes);
2950 JVM_END
2953 JVM_LEAF(jint, JVM_Available(jint fd, jlong *pbytes))
2954 JVMWrapper2("JVM_Available (0x%x)", fd);
2955 //%note jvm_r6
2956 return os::available(fd, pbytes);
2957 JVM_END
2960 JVM_LEAF(jlong, JVM_Lseek(jint fd, jlong offset, jint whence))
2961 JVMWrapper4("JVM_Lseek (0x%x, " INT64_FORMAT ", %d)", fd, (int64_t) offset, whence);
2962 //%note jvm_r6
2963 return os::lseek(fd, offset, whence);
2964 JVM_END
2967 JVM_LEAF(jint, JVM_SetLength(jint fd, jlong length))
2968 JVMWrapper3("JVM_SetLength (0x%x, " INT64_FORMAT ")", fd, (int64_t) length);
2969 return os::ftruncate(fd, length);
2970 JVM_END
2973 JVM_LEAF(jint, JVM_Sync(jint fd))
2974 JVMWrapper2("JVM_Sync (0x%x)", fd);
2975 //%note jvm_r6
2976 return os::fsync(fd);
2977 JVM_END
2980 // Printing support //////////////////////////////////////////////////
2981 extern "C" {
2983 ATTRIBUTE_PRINTF(3, 0)
2984 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2985 // see bug 4399518, 4417214
2986 if ((intptr_t)count <= 0) return -1;
2988 int result = vsnprintf(str, count, fmt, args);
2989 // Note: on truncation vsnprintf(3) on Unix returns number of
2990 // characters which would have been written had the buffer been large
2991 // enough; on Windows, it returns -1. We handle both cases here and
2992 // always return -1, and perform null termination.
2993 if ((result > 0 && (size_t)result >= count) || result == -1) {
2994 str[count - 1] = '\0';
2995 result = -1;
2996 }
2998 return result;
2999 }
3001 ATTRIBUTE_PRINTF(3, 0)
3002 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
3003 va_list args;
3004 int len;
3005 va_start(args, fmt);
3006 len = jio_vsnprintf(str, count, fmt, args);
3007 va_end(args);
3008 return len;
3009 }
3011 ATTRIBUTE_PRINTF(2,3)
3012 int jio_fprintf(FILE* f, const char *fmt, ...) {
3013 int len;
3014 va_list args;
3015 va_start(args, fmt);
3016 len = jio_vfprintf(f, fmt, args);
3017 va_end(args);
3018 return len;
3019 }
3021 ATTRIBUTE_PRINTF(2, 0)
3022 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
3023 if (Arguments::vfprintf_hook() != NULL) {
3024 return Arguments::vfprintf_hook()(f, fmt, args);
3025 } else {
3026 return vfprintf(f, fmt, args);
3027 }
3028 }
3030 ATTRIBUTE_PRINTF(1, 2)
3031 JNIEXPORT int jio_printf(const char *fmt, ...) {
3032 int len;
3033 va_list args;
3034 va_start(args, fmt);
3035 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
3036 va_end(args);
3037 return len;
3038 }
3041 // HotSpot specific jio method
3042 void jio_print(const char* s) {
3043 // Try to make this function as atomic as possible.
3044 if (Arguments::vfprintf_hook() != NULL) {
3045 jio_fprintf(defaultStream::output_stream(), "%s", s);
3046 } else {
3047 // Make an unused local variable to avoid warning from gcc 4.x compiler.
3048 size_t count = ::write(defaultStream::output_fd(), s, (int)strlen(s));
3049 }
3050 }
3052 } // Extern C
3054 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
3056 // In most of the JVM Thread support functions we need to be sure to lock the Threads_lock
3057 // to prevent the target thread from exiting after we have a pointer to the C++ Thread or
3058 // OSThread objects. The exception to this rule is when the target object is the thread
3059 // doing the operation, in which case we know that the thread won't exit until the
3060 // operation is done (all exits being voluntary). There are a few cases where it is
3061 // rather silly to do operations on yourself, like resuming yourself or asking whether
3062 // you are alive. While these can still happen, they are not subject to deadlocks if
3063 // the lock is held while the operation occurs (this is not the case for suspend, for
3064 // instance), and are very unlikely. Because IsAlive needs to be fast and its
3065 // implementation is local to this file, we always lock Threads_lock for that one.
3067 static void thread_entry(JavaThread* thread, TRAPS) {
3068 HandleMark hm(THREAD);
3069 Handle obj(THREAD, thread->threadObj());
3070 JavaValue result(T_VOID);
3071 JavaCalls::call_virtual(&result,
3072 obj,
3073 KlassHandle(THREAD, SystemDictionary::Thread_klass()),
3074 vmSymbols::run_method_name(),
3075 vmSymbols::void_method_signature(),
3076 THREAD);
3077 }
3080 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3081 JVMWrapper("JVM_StartThread");
3082 JavaThread *native_thread = NULL;
3084 // We cannot hold the Threads_lock when we throw an exception,
3085 // due to rank ordering issues. Example: we might need to grab the
3086 // Heap_lock while we construct the exception.
3087 bool throw_illegal_thread_state = false;
3089 // We must release the Threads_lock before we can post a jvmti event
3090 // in Thread::start.
3091 {
3092 // Ensure that the C++ Thread and OSThread structures aren't freed before
3093 // we operate.
3094 MutexLocker mu(Threads_lock);
3096 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3097 // re-starting an already started thread, so we should usually find
3098 // that the JavaThread is null. However for a JNI attached thread
3099 // there is a small window between the Thread object being created
3100 // (with its JavaThread set) and the update to its threadStatus, so we
3101 // have to check for this
3102 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
3103 throw_illegal_thread_state = true;
3104 } else {
3105 // We could also check the stillborn flag to see if this thread was already stopped, but
3106 // for historical reasons we let the thread detect that itself when it starts running
3108 jlong size =
3109 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3110 // Allocate the C++ Thread structure and create the native thread. The
3111 // stack size retrieved from java is signed, but the constructor takes
3112 // size_t (an unsigned type), so avoid passing negative values which would
3113 // result in really large stacks.
3114 size_t sz = size > 0 ? (size_t) size : 0;
3115 native_thread = new JavaThread(&thread_entry, sz);
3117 // At this point it may be possible that no osthread was created for the
3118 // JavaThread due to lack of memory. Check for this situation and throw
3119 // an exception if necessary. Eventually we may want to change this so
3120 // that we only grab the lock if the thread was created successfully -
3121 // then we can also do this check and throw the exception in the
3122 // JavaThread constructor.
3123 if (native_thread->osthread() != NULL) {
3124 // Note: the current thread is not being used within "prepare".
3125 native_thread->prepare(jthread);
3126 }
3127 }
3128 }
3130 if (throw_illegal_thread_state) {
3131 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3132 }
3134 assert(native_thread != NULL, "Starting null thread?");
3136 if (native_thread->osthread() == NULL) {
3137 // No one should hold a reference to the 'native_thread'.
3138 delete native_thread;
3139 if (JvmtiExport::should_post_resource_exhausted()) {
3140 JvmtiExport::post_resource_exhausted(
3141 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3142 "unable to create new native thread");
3143 }
3144 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3145 "unable to create new native thread");
3146 }
3148 Thread::start(native_thread);
3150 JVM_END
3152 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3153 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
3154 // but is thought to be reliable and simple. In the case, where the receiver is the
3155 // same thread as the sender, no safepoint is needed.
3156 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3157 JVMWrapper("JVM_StopThread");
3159 oop java_throwable = JNIHandles::resolve(throwable);
3160 if (java_throwable == NULL) {
3161 THROW(vmSymbols::java_lang_NullPointerException());
3162 }
3163 oop java_thread = JNIHandles::resolve_non_null(jthread);
3164 JavaThread* receiver = java_lang_Thread::thread(java_thread);
3165 Events::log_exception(JavaThread::current(),
3166 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3167 p2i(receiver), p2i((address)java_thread), p2i(throwable));
3168 // First check if thread is alive
3169 if (receiver != NULL) {
3170 // Check if exception is getting thrown at self (use oop equality, since the
3171 // target object might exit)
3172 if (java_thread == thread->threadObj()) {
3173 THROW_OOP(java_throwable);
3174 } else {
3175 // Enques a VM_Operation to stop all threads and then deliver the exception...
3176 Thread::send_async_exception(java_thread, JNIHandles::resolve(throwable));
3177 }
3178 }
3179 else {
3180 // Either:
3181 // - target thread has not been started before being stopped, or
3182 // - target thread already terminated
3183 // We could read the threadStatus to determine which case it is
3184 // but that is overkill as it doesn't matter. We must set the
3185 // stillborn flag for the first case, and if the thread has already
3186 // exited setting this flag has no affect
3187 java_lang_Thread::set_stillborn(java_thread);
3188 }
3189 JVM_END
3192 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3193 JVMWrapper("JVM_IsThreadAlive");
3195 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3196 return java_lang_Thread::is_alive(thread_oop);
3197 JVM_END
3200 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3201 JVMWrapper("JVM_SuspendThread");
3202 oop java_thread = JNIHandles::resolve_non_null(jthread);
3203 JavaThread* receiver = java_lang_Thread::thread(java_thread);
3205 if (receiver != NULL) {
3206 // thread has run and has not exited (still on threads list)
3208 {
3209 MutexLockerEx ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3210 if (receiver->is_external_suspend()) {
3211 // Don't allow nested external suspend requests. We can't return
3212 // an error from this interface so just ignore the problem.
3213 return;
3214 }
3215 if (receiver->is_exiting()) { // thread is in the process of exiting
3216 return;
3217 }
3218 receiver->set_external_suspend();
3219 }
3221 // java_suspend() will catch threads in the process of exiting
3222 // and will ignore them.
3223 receiver->java_suspend();
3225 // It would be nice to have the following assertion in all the
3226 // time, but it is possible for a racing resume request to have
3227 // resumed this thread right after we suspended it. Temporarily
3228 // enable this assertion if you are chasing a different kind of
3229 // bug.
3230 //
3231 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3232 // receiver->is_being_ext_suspended(), "thread is not suspended");
3233 }
3234 JVM_END
3237 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3238 JVMWrapper("JVM_ResumeThread");
3239 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate.
3240 // We need to *always* get the threads lock here, since this operation cannot be allowed during
3241 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3242 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3243 // looks at it.
3244 MutexLocker ml(Threads_lock);
3245 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3246 if (thr != NULL) {
3247 // the thread has run and is not in the process of exiting
3248 thr->java_resume();
3249 }
3250 JVM_END
3253 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3254 JVMWrapper("JVM_SetThreadPriority");
3255 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3256 MutexLocker ml(Threads_lock);
3257 oop java_thread = JNIHandles::resolve_non_null(jthread);
3258 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3259 JavaThread* thr = java_lang_Thread::thread(java_thread);
3260 if (thr != NULL) { // Thread not yet started; priority pushed down when it is
3261 Thread::set_priority(thr, (ThreadPriority)prio);
3262 }
3263 JVM_END
3266 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3267 JVMWrapper("JVM_Yield");
3268 if (os::dont_yield()) return;
3269 #ifndef USDT2
3270 HS_DTRACE_PROBE0(hotspot, thread__yield);
3271 #else /* USDT2 */
3272 HOTSPOT_THREAD_YIELD();
3273 #endif /* USDT2 */
3274 // When ConvertYieldToSleep is off (default), this matches the classic VM use of yield.
3275 // Critical for similar threading behaviour
3276 if (ConvertYieldToSleep) {
3277 os::sleep(thread, MinSleepInterval, false);
3278 } else {
3279 os::yield();
3280 }
3281 JVM_END
3284 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3285 JVMWrapper("JVM_Sleep");
3287 if (millis < 0) {
3288 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3289 }
3291 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
3292 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3293 }
3295 // Save current thread state and restore it at the end of this block.
3296 // And set new thread state to SLEEPING.
3297 JavaThreadSleepState jtss(thread);
3299 #ifndef USDT2
3300 HS_DTRACE_PROBE1(hotspot, thread__sleep__begin, millis);
3301 #else /* USDT2 */
3302 HOTSPOT_THREAD_SLEEP_BEGIN(
3303 millis);
3304 #endif /* USDT2 */
3306 EventThreadSleep event;
3308 if (millis == 0) {
3309 // When ConvertSleepToYield is on, this matches the classic VM implementation of
3310 // JVM_Sleep. Critical for similar threading behaviour (Win32)
3311 // It appears that in certain GUI contexts, it may be beneficial to do a short sleep
3312 // for SOLARIS
3313 if (ConvertSleepToYield) {
3314 os::yield();
3315 } else {
3316 ThreadState old_state = thread->osthread()->get_state();
3317 thread->osthread()->set_state(SLEEPING);
3318 os::sleep(thread, MinSleepInterval, false);
3319 thread->osthread()->set_state(old_state);
3320 }
3321 } else {
3322 ThreadState old_state = thread->osthread()->get_state();
3323 thread->osthread()->set_state(SLEEPING);
3324 if (os::sleep(thread, millis, true) == OS_INTRPT) {
3325 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3326 // us while we were sleeping. We do not overwrite those.
3327 if (!HAS_PENDING_EXCEPTION) {
3328 if (event.should_commit()) {
3329 event.set_time(millis);
3330 event.commit();
3331 }
3332 #ifndef USDT2
3333 HS_DTRACE_PROBE1(hotspot, thread__sleep__end,1);
3334 #else /* USDT2 */
3335 HOTSPOT_THREAD_SLEEP_END(
3336 1);
3337 #endif /* USDT2 */
3338 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3339 // to properly restore the thread state. That's likely wrong.
3340 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3341 }
3342 }
3343 thread->osthread()->set_state(old_state);
3344 }
3345 if (event.should_commit()) {
3346 event.set_time(millis);
3347 event.commit();
3348 }
3349 #ifndef USDT2
3350 HS_DTRACE_PROBE1(hotspot, thread__sleep__end,0);
3351 #else /* USDT2 */
3352 HOTSPOT_THREAD_SLEEP_END(
3353 0);
3354 #endif /* USDT2 */
3355 JVM_END
3357 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3358 JVMWrapper("JVM_CurrentThread");
3359 oop jthread = thread->threadObj();
3360 assert (thread != NULL, "no current thread!");
3361 return JNIHandles::make_local(env, jthread);
3362 JVM_END
3365 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3366 JVMWrapper("JVM_CountStackFrames");
3368 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3369 oop java_thread = JNIHandles::resolve_non_null(jthread);
3370 bool throw_illegal_thread_state = false;
3371 int count = 0;
3373 {
3374 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3375 // We need to re-resolve the java_thread, since a GC might have happened during the
3376 // acquire of the lock
3377 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3379 if (thr == NULL) {
3380 // do nothing
3381 } else if(! thr->is_external_suspend() || ! thr->frame_anchor()->walkable()) {
3382 // Check whether this java thread has been suspended already. If not, throws
3383 // IllegalThreadStateException. We defer to throw that exception until
3384 // Threads_lock is released since loading exception class has to leave VM.
3385 // The correct way to test a thread is actually suspended is
3386 // wait_for_ext_suspend_completion(), but we can't call that while holding
3387 // the Threads_lock. The above tests are sufficient for our purposes
3388 // provided the walkability of the stack is stable - which it isn't
3389 // 100% but close enough for most practical purposes.
3390 throw_illegal_thread_state = true;
3391 } else {
3392 // Count all java activation, i.e., number of vframes
3393 for(vframeStream vfst(thr); !vfst.at_end(); vfst.next()) {
3394 // Native frames are not counted
3395 if (!vfst.method()->is_native()) count++;
3396 }
3397 }
3398 }
3400 if (throw_illegal_thread_state) {
3401 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3402 "this thread is not suspended");
3403 }
3404 return count;
3405 JVM_END
3407 // Consider: A better way to implement JVM_Interrupt() is to acquire
3408 // Threads_lock to resolve the jthread into a Thread pointer, fetch
3409 // Thread->platformevent, Thread->native_thr, Thread->parker, etc.,
3410 // drop Threads_lock, and the perform the unpark() and thr_kill() operations
3411 // outside the critical section. Threads_lock is hot so we want to minimize
3412 // the hold-time. A cleaner interface would be to decompose interrupt into
3413 // two steps. The 1st phase, performed under Threads_lock, would return
3414 // a closure that'd be invoked after Threads_lock was dropped.
3415 // This tactic is safe as PlatformEvent and Parkers are type-stable (TSM) and
3416 // admit spurious wakeups.
3418 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3419 JVMWrapper("JVM_Interrupt");
3421 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3422 oop java_thread = JNIHandles::resolve_non_null(jthread);
3423 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3424 // We need to re-resolve the java_thread, since a GC might have happened during the
3425 // acquire of the lock
3426 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3427 if (thr != NULL) {
3428 Thread::interrupt(thr);
3429 }
3430 JVM_END
3433 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3434 JVMWrapper("JVM_IsInterrupted");
3436 // Ensure that the C++ Thread and OSThread structures aren't freed before we operate
3437 oop java_thread = JNIHandles::resolve_non_null(jthread);
3438 MutexLockerEx ml(thread->threadObj() == java_thread ? NULL : Threads_lock);
3439 // We need to re-resolve the java_thread, since a GC might have happened during the
3440 // acquire of the lock
3441 JavaThread* thr = java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread));
3442 if (thr == NULL) {
3443 return JNI_FALSE;
3444 } else {
3445 return (jboolean) Thread::is_interrupted(thr, clear_interrupted != 0);
3446 }
3447 JVM_END
3450 // Return true iff the current thread has locked the object passed in
3452 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3453 JVMWrapper("JVM_HoldsLock");
3454 assert(THREAD->is_Java_thread(), "sanity check");
3455 if (obj == NULL) {
3456 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3457 }
3458 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3459 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3460 JVM_END
3463 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3464 JVMWrapper("JVM_DumpAllStacks");
3465 VM_PrintThreads op;
3466 VMThread::execute(&op);
3467 if (JvmtiExport::should_post_data_dump()) {
3468 JvmtiExport::post_data_dump();
3469 }
3470 JVM_END
3472 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3473 JVMWrapper("JVM_SetNativeThreadName");
3474 ResourceMark rm(THREAD);
3475 oop java_thread = JNIHandles::resolve_non_null(jthread);
3476 JavaThread* thr = java_lang_Thread::thread(java_thread);
3477 // Thread naming only supported for the current thread, doesn't work for
3478 // target threads.
3479 if (Thread::current() == thr && !thr->has_attached_via_jni()) {
3480 // we don't set the name of an attached thread to avoid stepping
3481 // on other programs
3482 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3483 os::set_native_thread_name(thread_name);
3484 }
3485 JVM_END
3487 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3489 static bool is_trusted_frame(JavaThread* jthread, vframeStream* vfst) {
3490 assert(jthread->is_Java_thread(), "must be a Java thread");
3491 if (jthread->privileged_stack_top() == NULL) return false;
3492 if (jthread->privileged_stack_top()->frame_id() == vfst->frame_id()) {
3493 oop loader = jthread->privileged_stack_top()->class_loader();
3494 if (loader == NULL) return true;
3495 bool trusted = java_lang_ClassLoader::is_trusted_loader(loader);
3496 if (trusted) return true;
3497 }
3498 return false;
3499 }
3501 JVM_ENTRY(jclass, JVM_CurrentLoadedClass(JNIEnv *env))
3502 JVMWrapper("JVM_CurrentLoadedClass");
3503 ResourceMark rm(THREAD);
3505 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3506 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3507 bool trusted = is_trusted_frame(thread, &vfst);
3508 if (trusted) return NULL;
3510 Method* m = vfst.method();
3511 if (!m->is_native()) {
3512 InstanceKlass* holder = m->method_holder();
3513 oop loader = holder->class_loader();
3514 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3515 return (jclass) JNIHandles::make_local(env, holder->java_mirror());
3516 }
3517 }
3518 }
3519 return NULL;
3520 JVM_END
3523 JVM_ENTRY(jobject, JVM_CurrentClassLoader(JNIEnv *env))
3524 JVMWrapper("JVM_CurrentClassLoader");
3525 ResourceMark rm(THREAD);
3527 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3529 // if a method in a class in a trusted loader is in a doPrivileged, return NULL
3530 bool trusted = is_trusted_frame(thread, &vfst);
3531 if (trusted) return NULL;
3533 Method* m = vfst.method();
3534 if (!m->is_native()) {
3535 InstanceKlass* holder = m->method_holder();
3536 assert(holder->is_klass(), "just checking");
3537 oop loader = holder->class_loader();
3538 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3539 return JNIHandles::make_local(env, loader);
3540 }
3541 }
3542 }
3543 return NULL;
3544 JVM_END
3547 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3548 JVMWrapper("JVM_GetClassContext");
3549 ResourceMark rm(THREAD);
3550 JvmtiVMObjectAllocEventCollector oam;
3551 vframeStream vfst(thread);
3553 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3554 // This must only be called from SecurityManager.getClassContext
3555 Method* m = vfst.method();
3556 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3557 m->name() == vmSymbols::getClassContext_name() &&
3558 m->signature() == vmSymbols::void_class_array_signature())) {
3559 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3560 }
3561 }
3563 // Collect method holders
3564 GrowableArray<KlassHandle>* klass_array = new GrowableArray<KlassHandle>();
3565 for (; !vfst.at_end(); vfst.security_next()) {
3566 Method* m = vfst.method();
3567 // Native frames are not returned
3568 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3569 Klass* holder = m->method_holder();
3570 assert(holder->is_klass(), "just checking");
3571 klass_array->append(holder);
3572 }
3573 }
3575 // Create result array of type [Ljava/lang/Class;
3576 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3577 // Fill in mirrors corresponding to method holders
3578 for (int i = 0; i < klass_array->length(); i++) {
3579 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3580 }
3582 return (jobjectArray) JNIHandles::make_local(env, result);
3583 JVM_END
3586 JVM_ENTRY(jint, JVM_ClassDepth(JNIEnv *env, jstring name))
3587 JVMWrapper("JVM_ClassDepth");
3588 ResourceMark rm(THREAD);
3589 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
3590 Handle class_name_str = java_lang_String::internalize_classname(h_name, CHECK_0);
3592 const char* str = java_lang_String::as_utf8_string(class_name_str());
3593 TempNewSymbol class_name_sym = SymbolTable::probe(str, (int)strlen(str));
3594 if (class_name_sym == NULL) {
3595 return -1;
3596 }
3598 int depth = 0;
3600 for(vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3601 if (!vfst.method()->is_native()) {
3602 InstanceKlass* holder = vfst.method()->method_holder();
3603 assert(holder->is_klass(), "just checking");
3604 if (holder->name() == class_name_sym) {
3605 return depth;
3606 }
3607 depth++;
3608 }
3609 }
3610 return -1;
3611 JVM_END
3614 JVM_ENTRY(jint, JVM_ClassLoaderDepth(JNIEnv *env))
3615 JVMWrapper("JVM_ClassLoaderDepth");
3616 ResourceMark rm(THREAD);
3617 int depth = 0;
3618 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3619 // if a method in a class in a trusted loader is in a doPrivileged, return -1
3620 bool trusted = is_trusted_frame(thread, &vfst);
3621 if (trusted) return -1;
3623 Method* m = vfst.method();
3624 if (!m->is_native()) {
3625 InstanceKlass* holder = m->method_holder();
3626 assert(holder->is_klass(), "just checking");
3627 oop loader = holder->class_loader();
3628 if (loader != NULL && !java_lang_ClassLoader::is_trusted_loader(loader)) {
3629 return depth;
3630 }
3631 depth++;
3632 }
3633 }
3634 return -1;
3635 JVM_END
3638 // java.lang.Package ////////////////////////////////////////////////////////////////
3641 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3642 JVMWrapper("JVM_GetSystemPackage");
3643 ResourceMark rm(THREAD);
3644 JvmtiVMObjectAllocEventCollector oam;
3645 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3646 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3647 return (jstring) JNIHandles::make_local(result);
3648 JVM_END
3651 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3652 JVMWrapper("JVM_GetSystemPackages");
3653 JvmtiVMObjectAllocEventCollector oam;
3654 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3655 return (jobjectArray) JNIHandles::make_local(result);
3656 JVM_END
3659 // ObjectInputStream ///////////////////////////////////////////////////////////////
3661 bool force_verify_field_access(Klass* current_class, Klass* field_class, AccessFlags access, bool classloader_only) {
3662 if (current_class == NULL) {
3663 return true;
3664 }
3665 if ((current_class == field_class) || access.is_public()) {
3666 return true;
3667 }
3669 if (access.is_protected()) {
3670 // See if current_class is a subclass of field_class
3671 if (current_class->is_subclass_of(field_class)) {
3672 return true;
3673 }
3674 }
3676 return (!access.is_private() && InstanceKlass::cast(current_class)->is_same_class_package(field_class));
3677 }
3680 // JVM_AllocateNewObject and JVM_AllocateNewArray are unused as of 1.4
3681 JVM_ENTRY(jobject, JVM_AllocateNewObject(JNIEnv *env, jobject receiver, jclass currClass, jclass initClass))
3682 JVMWrapper("JVM_AllocateNewObject");
3683 JvmtiVMObjectAllocEventCollector oam;
3684 // Receiver is not used
3685 oop curr_mirror = JNIHandles::resolve_non_null(currClass);
3686 oop init_mirror = JNIHandles::resolve_non_null(initClass);
3688 // Cannot instantiate primitive types
3689 if (java_lang_Class::is_primitive(curr_mirror) || java_lang_Class::is_primitive(init_mirror)) {
3690 ResourceMark rm(THREAD);
3691 THROW_0(vmSymbols::java_lang_InvalidClassException());
3692 }
3694 // Arrays not allowed here, must use JVM_AllocateNewArray
3695 if (java_lang_Class::as_Klass(curr_mirror)->oop_is_array() ||
3696 java_lang_Class::as_Klass(init_mirror)->oop_is_array()) {
3697 ResourceMark rm(THREAD);
3698 THROW_0(vmSymbols::java_lang_InvalidClassException());
3699 }
3701 instanceKlassHandle curr_klass (THREAD, java_lang_Class::as_Klass(curr_mirror));
3702 instanceKlassHandle init_klass (THREAD, java_lang_Class::as_Klass(init_mirror));
3704 assert(curr_klass->is_subclass_of(init_klass()), "just checking");
3706 // Interfaces, abstract classes, and java.lang.Class classes cannot be instantiated directly.
3707 curr_klass->check_valid_for_instantiation(false, CHECK_NULL);
3709 // Make sure klass is initialized, since we are about to instantiate one of them.
3710 curr_klass->initialize(CHECK_NULL);
3712 methodHandle m (THREAD,
3713 init_klass->find_method(vmSymbols::object_initializer_name(),
3714 vmSymbols::void_method_signature()));
3715 if (m.is_null()) {
3716 ResourceMark rm(THREAD);
3717 THROW_MSG_0(vmSymbols::java_lang_NoSuchMethodError(),
3718 Method::name_and_sig_as_C_string(init_klass(),
3719 vmSymbols::object_initializer_name(),
3720 vmSymbols::void_method_signature()));
3721 }
3723 if (curr_klass == init_klass && !m->is_public()) {
3724 // Calling the constructor for class 'curr_klass'.
3725 // Only allow calls to a public no-arg constructor.
3726 // This path corresponds to creating an Externalizable object.
3727 THROW_0(vmSymbols::java_lang_IllegalAccessException());
3728 }
3730 if (!force_verify_field_access(curr_klass(), init_klass(), m->access_flags(), false)) {
3731 // subclass 'curr_klass' does not have access to no-arg constructor of 'initcb'
3732 THROW_0(vmSymbols::java_lang_IllegalAccessException());
3733 }
3735 Handle obj = curr_klass->allocate_instance_handle(CHECK_NULL);
3736 // Call constructor m. This might call a constructor higher up in the hierachy
3737 JavaCalls::call_default_constructor(thread, m, obj, CHECK_NULL);
3739 return JNIHandles::make_local(obj());
3740 JVM_END
3743 JVM_ENTRY(jobject, JVM_AllocateNewArray(JNIEnv *env, jobject obj, jclass currClass, jint length))
3744 JVMWrapper("JVM_AllocateNewArray");
3745 JvmtiVMObjectAllocEventCollector oam;
3746 oop mirror = JNIHandles::resolve_non_null(currClass);
3748 if (java_lang_Class::is_primitive(mirror)) {
3749 THROW_0(vmSymbols::java_lang_InvalidClassException());
3750 }
3751 Klass* k = java_lang_Class::as_Klass(mirror);
3752 oop result;
3754 if (k->oop_is_typeArray()) {
3755 // typeArray
3756 result = TypeArrayKlass::cast(k)->allocate(length, CHECK_NULL);
3757 } else if (k->oop_is_objArray()) {
3758 // objArray
3759 ObjArrayKlass* oak = ObjArrayKlass::cast(k);
3760 oak->initialize(CHECK_NULL); // make sure class is initialized (matches Classic VM behavior)
3761 result = oak->allocate(length, CHECK_NULL);
3762 } else {
3763 THROW_0(vmSymbols::java_lang_InvalidClassException());
3764 }
3765 return JNIHandles::make_local(env, result);
3766 JVM_END
3769 // Returns first non-privileged class loader on the stack (excluding reflection
3770 // generated frames) or null if only classes loaded by the boot class loader
3771 // and extension class loader are found on the stack.
3773 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3774 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3775 // UseNewReflection
3776 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3777 oop loader = vfst.method()->method_holder()->class_loader();
3778 if (loader != NULL && !SystemDictionary::is_ext_class_loader(loader)) {
3779 return JNIHandles::make_local(env, loader);
3780 }
3781 }
3782 return NULL;
3783 JVM_END
3786 // Load a class relative to the most recent class on the stack with a non-null
3787 // classloader.
3788 // This function has been deprecated and should not be considered part of the
3789 // specified JVM interface.
3791 JVM_ENTRY(jclass, JVM_LoadClass0(JNIEnv *env, jobject receiver,
3792 jclass currClass, jstring currClassName))
3793 JVMWrapper("JVM_LoadClass0");
3794 // Receiver is not used
3795 ResourceMark rm(THREAD);
3797 // Class name argument is not guaranteed to be in internal format
3798 Handle classname (THREAD, JNIHandles::resolve_non_null(currClassName));
3799 Handle string = java_lang_String::internalize_classname(classname, CHECK_NULL);
3801 const char* str = java_lang_String::as_utf8_string(string());
3803 if (str == NULL || (int)strlen(str) > Symbol::max_length()) {
3804 // It's impossible to create this class; the name cannot fit
3805 // into the constant pool.
3806 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), str);
3807 }
3809 TempNewSymbol name = SymbolTable::new_symbol(str, CHECK_NULL);
3810 Handle curr_klass (THREAD, JNIHandles::resolve(currClass));
3811 // Find the most recent class on the stack with a non-null classloader
3812 oop loader = NULL;
3813 oop protection_domain = NULL;
3814 if (curr_klass.is_null()) {
3815 for (vframeStream vfst(thread);
3816 !vfst.at_end() && loader == NULL;
3817 vfst.next()) {
3818 if (!vfst.method()->is_native()) {
3819 InstanceKlass* holder = vfst.method()->method_holder();
3820 loader = holder->class_loader();
3821 protection_domain = holder->protection_domain();
3822 }
3823 }
3824 } else {
3825 Klass* curr_klass_oop = java_lang_Class::as_Klass(curr_klass());
3826 loader = InstanceKlass::cast(curr_klass_oop)->class_loader();
3827 protection_domain = InstanceKlass::cast(curr_klass_oop)->protection_domain();
3828 }
3829 Handle h_loader(THREAD, loader);
3830 Handle h_prot (THREAD, protection_domain);
3831 jclass result = find_class_from_class_loader(env, name, true, h_loader, h_prot,
3832 false, thread);
3833 if (TraceClassResolution && result != NULL) {
3834 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
3835 }
3836 return result;
3837 JVM_END
3840 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3843 // resolve array handle and check arguments
3844 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3845 if (arr == NULL) {
3846 THROW_0(vmSymbols::java_lang_NullPointerException());
3847 }
3848 oop a = JNIHandles::resolve_non_null(arr);
3849 if (!a->is_array() || (type_array_only && !a->is_typeArray())) {
3850 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3851 }
3852 return arrayOop(a);
3853 }
3856 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3857 JVMWrapper("JVM_GetArrayLength");
3858 arrayOop a = check_array(env, arr, false, CHECK_0);
3859 return a->length();
3860 JVM_END
3863 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3864 JVMWrapper("JVM_Array_Get");
3865 JvmtiVMObjectAllocEventCollector oam;
3866 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3867 jvalue value;
3868 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3869 oop box = Reflection::box(&value, type, CHECK_NULL);
3870 return JNIHandles::make_local(env, box);
3871 JVM_END
3874 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3875 JVMWrapper("JVM_GetPrimitiveArrayElement");
3876 jvalue value;
3877 value.i = 0; // to initialize value before getting used in CHECK
3878 arrayOop a = check_array(env, arr, true, CHECK_(value));
3879 assert(a->is_typeArray(), "just checking");
3880 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3881 BasicType wide_type = (BasicType) wCode;
3882 if (type != wide_type) {
3883 Reflection::widen(&value, type, wide_type, CHECK_(value));
3884 }
3885 return value;
3886 JVM_END
3889 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3890 JVMWrapper("JVM_SetArrayElement");
3891 arrayOop a = check_array(env, arr, false, CHECK);
3892 oop box = JNIHandles::resolve(val);
3893 jvalue value;
3894 value.i = 0; // to initialize value before getting used in CHECK
3895 BasicType value_type;
3896 if (a->is_objArray()) {
3897 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3898 value_type = Reflection::unbox_for_regular_object(box, &value);
3899 } else {
3900 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3901 }
3902 Reflection::array_set(&value, a, index, value_type, CHECK);
3903 JVM_END
3906 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3907 JVMWrapper("JVM_SetPrimitiveArrayElement");
3908 arrayOop a = check_array(env, arr, true, CHECK);
3909 assert(a->is_typeArray(), "just checking");
3910 BasicType value_type = (BasicType) vCode;
3911 Reflection::array_set(&v, a, index, value_type, CHECK);
3912 JVM_END
3915 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3916 JVMWrapper("JVM_NewArray");
3917 JvmtiVMObjectAllocEventCollector oam;
3918 oop element_mirror = JNIHandles::resolve(eltClass);
3919 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3920 return JNIHandles::make_local(env, result);
3921 JVM_END
3924 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3925 JVMWrapper("JVM_NewMultiArray");
3926 JvmtiVMObjectAllocEventCollector oam;
3927 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3928 oop element_mirror = JNIHandles::resolve(eltClass);
3929 assert(dim_array->is_typeArray(), "just checking");
3930 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3931 return JNIHandles::make_local(env, result);
3932 JVM_END
3935 // Networking library support ////////////////////////////////////////////////////////////////////
3937 JVM_LEAF(jint, JVM_InitializeSocketLibrary())
3938 JVMWrapper("JVM_InitializeSocketLibrary");
3939 return 0;
3940 JVM_END
3943 JVM_LEAF(jint, JVM_Socket(jint domain, jint type, jint protocol))
3944 JVMWrapper("JVM_Socket");
3945 return os::socket(domain, type, protocol);
3946 JVM_END
3949 JVM_LEAF(jint, JVM_SocketClose(jint fd))
3950 JVMWrapper2("JVM_SocketClose (0x%x)", fd);
3951 //%note jvm_r6
3952 return os::socket_close(fd);
3953 JVM_END
3956 JVM_LEAF(jint, JVM_SocketShutdown(jint fd, jint howto))
3957 JVMWrapper2("JVM_SocketShutdown (0x%x)", fd);
3958 //%note jvm_r6
3959 return os::socket_shutdown(fd, howto);
3960 JVM_END
3963 JVM_LEAF(jint, JVM_Recv(jint fd, char *buf, jint nBytes, jint flags))
3964 JVMWrapper2("JVM_Recv (0x%x)", fd);
3965 //%note jvm_r6
3966 return os::recv(fd, buf, (size_t)nBytes, (uint)flags);
3967 JVM_END
3970 JVM_LEAF(jint, JVM_Send(jint fd, char *buf, jint nBytes, jint flags))
3971 JVMWrapper2("JVM_Send (0x%x)", fd);
3972 //%note jvm_r6
3973 return os::send(fd, buf, (size_t)nBytes, (uint)flags);
3974 JVM_END
3977 JVM_LEAF(jint, JVM_Timeout(int fd, long timeout))
3978 JVMWrapper2("JVM_Timeout (0x%x)", fd);
3979 //%note jvm_r6
3980 return os::timeout(fd, timeout);
3981 JVM_END
3984 JVM_LEAF(jint, JVM_Listen(jint fd, jint count))
3985 JVMWrapper2("JVM_Listen (0x%x)", fd);
3986 //%note jvm_r6
3987 return os::listen(fd, count);
3988 JVM_END
3991 JVM_LEAF(jint, JVM_Connect(jint fd, struct sockaddr *him, jint len))
3992 JVMWrapper2("JVM_Connect (0x%x)", fd);
3993 //%note jvm_r6
3994 return os::connect(fd, him, (socklen_t)len);
3995 JVM_END
3998 JVM_LEAF(jint, JVM_Bind(jint fd, struct sockaddr *him, jint len))
3999 JVMWrapper2("JVM_Bind (0x%x)", fd);
4000 //%note jvm_r6
4001 return os::bind(fd, him, (socklen_t)len);
4002 JVM_END
4005 JVM_LEAF(jint, JVM_Accept(jint fd, struct sockaddr *him, jint *len))
4006 JVMWrapper2("JVM_Accept (0x%x)", fd);
4007 //%note jvm_r6
4008 socklen_t socklen = (socklen_t)(*len);
4009 jint result = os::accept(fd, him, &socklen);
4010 *len = (jint)socklen;
4011 return result;
4012 JVM_END
4015 JVM_LEAF(jint, JVM_RecvFrom(jint fd, char *buf, int nBytes, int flags, struct sockaddr *from, int *fromlen))
4016 JVMWrapper2("JVM_RecvFrom (0x%x)", fd);
4017 //%note jvm_r6
4018 socklen_t socklen = (socklen_t)(*fromlen);
4019 jint result = os::recvfrom(fd, buf, (size_t)nBytes, (uint)flags, from, &socklen);
4020 *fromlen = (int)socklen;
4021 return result;
4022 JVM_END
4025 JVM_LEAF(jint, JVM_GetSockName(jint fd, struct sockaddr *him, int *len))
4026 JVMWrapper2("JVM_GetSockName (0x%x)", fd);
4027 //%note jvm_r6
4028 socklen_t socklen = (socklen_t)(*len);
4029 jint result = os::get_sock_name(fd, him, &socklen);
4030 *len = (int)socklen;
4031 return result;
4032 JVM_END
4035 JVM_LEAF(jint, JVM_SendTo(jint fd, char *buf, int len, int flags, struct sockaddr *to, int tolen))
4036 JVMWrapper2("JVM_SendTo (0x%x)", fd);
4037 //%note jvm_r6
4038 return os::sendto(fd, buf, (size_t)len, (uint)flags, to, (socklen_t)tolen);
4039 JVM_END
4042 JVM_LEAF(jint, JVM_SocketAvailable(jint fd, jint *pbytes))
4043 JVMWrapper2("JVM_SocketAvailable (0x%x)", fd);
4044 //%note jvm_r6
4045 return os::socket_available(fd, pbytes);
4046 JVM_END
4049 JVM_LEAF(jint, JVM_GetSockOpt(jint fd, int level, int optname, char *optval, int *optlen))
4050 JVMWrapper2("JVM_GetSockOpt (0x%x)", fd);
4051 //%note jvm_r6
4052 socklen_t socklen = (socklen_t)(*optlen);
4053 jint result = os::get_sock_opt(fd, level, optname, optval, &socklen);
4054 *optlen = (int)socklen;
4055 return result;
4056 JVM_END
4059 JVM_LEAF(jint, JVM_SetSockOpt(jint fd, int level, int optname, const char *optval, int optlen))
4060 JVMWrapper2("JVM_GetSockOpt (0x%x)", fd);
4061 //%note jvm_r6
4062 return os::set_sock_opt(fd, level, optname, optval, (socklen_t)optlen);
4063 JVM_END
4066 JVM_LEAF(int, JVM_GetHostName(char* name, int namelen))
4067 JVMWrapper("JVM_GetHostName");
4068 return os::get_host_name(name, namelen);
4069 JVM_END
4072 // Library support ///////////////////////////////////////////////////////////////////////////
4074 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
4075 //%note jvm_ct
4076 JVMWrapper2("JVM_LoadLibrary (%s)", name);
4077 char ebuf[1024];
4078 void *load_result;
4079 {
4080 ThreadToNativeFromVM ttnfvm(thread);
4081 load_result = os::dll_load(name, ebuf, sizeof ebuf);
4082 }
4083 if (load_result == NULL) {
4084 char msg[1024];
4085 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
4086 // Since 'ebuf' may contain a string encoded using
4087 // platform encoding scheme, we need to pass
4088 // Exceptions::unsafe_to_utf8 to the new_exception method
4089 // as the last argument. See bug 6367357.
4090 Handle h_exception =
4091 Exceptions::new_exception(thread,
4092 vmSymbols::java_lang_UnsatisfiedLinkError(),
4093 msg, Exceptions::unsafe_to_utf8);
4095 THROW_HANDLE_0(h_exception);
4096 }
4097 return load_result;
4098 JVM_END
4101 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
4102 JVMWrapper("JVM_UnloadLibrary");
4103 os::dll_unload(handle);
4104 JVM_END
4107 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
4108 JVMWrapper2("JVM_FindLibraryEntry (%s)", name);
4109 return os::dll_lookup(handle, name);
4110 JVM_END
4113 // Floating point support ////////////////////////////////////////////////////////////////////
4115 JVM_LEAF(jboolean, JVM_IsNaN(jdouble a))
4116 JVMWrapper("JVM_IsNaN");
4117 return g_isnan(a);
4118 JVM_END
4121 // JNI version ///////////////////////////////////////////////////////////////////////////////
4123 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
4124 JVMWrapper2("JVM_IsSupportedJNIVersion (%d)", version);
4125 return Threads::is_supported_jni_version_including_1_1(version);
4126 JVM_END
4129 // String support ///////////////////////////////////////////////////////////////////////////
4131 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
4132 JVMWrapper("JVM_InternString");
4133 JvmtiVMObjectAllocEventCollector oam;
4134 if (str == NULL) return NULL;
4135 oop string = JNIHandles::resolve_non_null(str);
4136 oop result = StringTable::intern(string, CHECK_NULL);
4137 return (jstring) JNIHandles::make_local(env, result);
4138 JVM_END
4141 // Raw monitor support //////////////////////////////////////////////////////////////////////
4143 // The lock routine below calls lock_without_safepoint_check in order to get a raw lock
4144 // without interfering with the safepoint mechanism. The routines are not JVM_LEAF because
4145 // they might be called by non-java threads. The JVM_LEAF installs a NoHandleMark check
4146 // that only works with java threads.
4149 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
4150 VM_Exit::block_if_vm_exited();
4151 JVMWrapper("JVM_RawMonitorCreate");
4152 return new Mutex(Mutex::native, "JVM_RawMonitorCreate");
4153 }
4156 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
4157 VM_Exit::block_if_vm_exited();
4158 JVMWrapper("JVM_RawMonitorDestroy");
4159 delete ((Mutex*) mon);
4160 }
4163 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
4164 VM_Exit::block_if_vm_exited();
4165 JVMWrapper("JVM_RawMonitorEnter");
4166 ((Mutex*) mon)->jvm_raw_lock();
4167 return 0;
4168 }
4171 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
4172 VM_Exit::block_if_vm_exited();
4173 JVMWrapper("JVM_RawMonitorExit");
4174 ((Mutex*) mon)->jvm_raw_unlock();
4175 }
4178 // Support for Serialization
4180 typedef jfloat (JNICALL *IntBitsToFloatFn )(JNIEnv* env, jclass cb, jint value);
4181 typedef jdouble (JNICALL *LongBitsToDoubleFn)(JNIEnv* env, jclass cb, jlong value);
4182 typedef jint (JNICALL *FloatToIntBitsFn )(JNIEnv* env, jclass cb, jfloat value);
4183 typedef jlong (JNICALL *DoubleToLongBitsFn)(JNIEnv* env, jclass cb, jdouble value);
4185 static IntBitsToFloatFn int_bits_to_float_fn = NULL;
4186 static LongBitsToDoubleFn long_bits_to_double_fn = NULL;
4187 static FloatToIntBitsFn float_to_int_bits_fn = NULL;
4188 static DoubleToLongBitsFn double_to_long_bits_fn = NULL;
4191 void initialize_converter_functions() {
4192 if (JDK_Version::is_gte_jdk14x_version()) {
4193 // These functions only exist for compatibility with 1.3.1 and earlier
4194 return;
4195 }
4197 // called from universe_post_init()
4198 assert(
4199 int_bits_to_float_fn == NULL &&
4200 long_bits_to_double_fn == NULL &&
4201 float_to_int_bits_fn == NULL &&
4202 double_to_long_bits_fn == NULL ,
4203 "initialization done twice"
4204 );
4205 // initialize
4206 int_bits_to_float_fn = CAST_TO_FN_PTR(IntBitsToFloatFn , NativeLookup::base_library_lookup("java/lang/Float" , "intBitsToFloat" , "(I)F"));
4207 long_bits_to_double_fn = CAST_TO_FN_PTR(LongBitsToDoubleFn, NativeLookup::base_library_lookup("java/lang/Double", "longBitsToDouble", "(J)D"));
4208 float_to_int_bits_fn = CAST_TO_FN_PTR(FloatToIntBitsFn , NativeLookup::base_library_lookup("java/lang/Float" , "floatToIntBits" , "(F)I"));
4209 double_to_long_bits_fn = CAST_TO_FN_PTR(DoubleToLongBitsFn, NativeLookup::base_library_lookup("java/lang/Double", "doubleToLongBits", "(D)J"));
4210 // verify
4211 assert(
4212 int_bits_to_float_fn != NULL &&
4213 long_bits_to_double_fn != NULL &&
4214 float_to_int_bits_fn != NULL &&
4215 double_to_long_bits_fn != NULL ,
4216 "initialization failed"
4217 );
4218 }
4222 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
4224 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
4225 Handle loader, Handle protection_domain,
4226 jboolean throwError, TRAPS) {
4227 // Security Note:
4228 // The Java level wrapper will perform the necessary security check allowing
4229 // us to pass the NULL as the initiating class loader. The VM is responsible for
4230 // the checkPackageAccess relative to the initiating class loader via the
4231 // protection_domain. The protection_domain is passed as NULL by the java code
4232 // if there is no security manager in 3-arg Class.forName().
4233 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
4235 KlassHandle klass_handle(THREAD, klass);
4236 // Check if we should initialize the class
4237 if (init && klass_handle->oop_is_instance()) {
4238 klass_handle->initialize(CHECK_NULL);
4239 }
4240 return (jclass) JNIHandles::make_local(env, klass_handle->java_mirror());
4241 }
4244 // Internal SQE debugging support ///////////////////////////////////////////////////////////
4246 #ifndef PRODUCT
4248 extern "C" {
4249 JNIEXPORT jboolean JNICALL JVM_AccessVMBooleanFlag(const char* name, jboolean* value, jboolean is_get);
4250 JNIEXPORT jboolean JNICALL JVM_AccessVMIntFlag(const char* name, jint* value, jboolean is_get);
4251 JNIEXPORT void JNICALL JVM_VMBreakPoint(JNIEnv *env, jobject obj);
4252 }
4254 JVM_LEAF(jboolean, JVM_AccessVMBooleanFlag(const char* name, jboolean* value, jboolean is_get))
4255 JVMWrapper("JVM_AccessBoolVMFlag");
4256 return is_get ? CommandLineFlags::boolAt((char*) name, (bool*) value) : CommandLineFlags::boolAtPut((char*) name, (bool*) value, Flag::INTERNAL);
4257 JVM_END
4259 JVM_LEAF(jboolean, JVM_AccessVMIntFlag(const char* name, jint* value, jboolean is_get))
4260 JVMWrapper("JVM_AccessVMIntFlag");
4261 intx v;
4262 jboolean result = is_get ? CommandLineFlags::intxAt((char*) name, &v) : CommandLineFlags::intxAtPut((char*) name, &v, Flag::INTERNAL);
4263 *value = (jint)v;
4264 return result;
4265 JVM_END
4268 JVM_ENTRY(void, JVM_VMBreakPoint(JNIEnv *env, jobject obj))
4269 JVMWrapper("JVM_VMBreakPoint");
4270 oop the_obj = JNIHandles::resolve(obj);
4271 BREAKPOINT;
4272 JVM_END
4275 #endif
4278 // Method ///////////////////////////////////////////////////////////////////////////////////////////
4280 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
4281 JVMWrapper("JVM_InvokeMethod");
4282 Handle method_handle;
4283 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
4284 method_handle = Handle(THREAD, JNIHandles::resolve(method));
4285 Handle receiver(THREAD, JNIHandles::resolve(obj));
4286 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
4287 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
4288 jobject res = JNIHandles::make_local(env, result);
4289 if (JvmtiExport::should_post_vm_object_alloc()) {
4290 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
4291 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
4292 if (java_lang_Class::is_primitive(ret_type)) {
4293 // Only for primitive type vm allocates memory for java object.
4294 // See box() method.
4295 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
4296 }
4297 }
4298 return res;
4299 } else {
4300 THROW_0(vmSymbols::java_lang_StackOverflowError());
4301 }
4302 JVM_END
4305 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
4306 JVMWrapper("JVM_NewInstanceFromConstructor");
4307 oop constructor_mirror = JNIHandles::resolve(c);
4308 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
4309 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
4310 jobject res = JNIHandles::make_local(env, result);
4311 if (JvmtiExport::should_post_vm_object_alloc()) {
4312 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
4313 }
4314 return res;
4315 JVM_END
4317 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
4319 JVM_LEAF(jboolean, JVM_SupportsCX8())
4320 JVMWrapper("JVM_SupportsCX8");
4321 return VM_Version::supports_cx8();
4322 JVM_END
4325 JVM_ENTRY(jboolean, JVM_CX8Field(JNIEnv *env, jobject obj, jfieldID fid, jlong oldVal, jlong newVal))
4326 JVMWrapper("JVM_CX8Field");
4327 jlong res;
4328 oop o = JNIHandles::resolve(obj);
4329 intptr_t fldOffs = jfieldIDWorkaround::from_instance_jfieldID(o->klass(), fid);
4330 volatile jlong* addr = (volatile jlong*)((address)o + fldOffs);
4332 assert(VM_Version::supports_cx8(), "cx8 not supported");
4333 res = Atomic::cmpxchg(newVal, addr, oldVal);
4335 return res == oldVal;
4336 JVM_END
4338 // DTrace ///////////////////////////////////////////////////////////////////
4340 JVM_ENTRY(jint, JVM_DTraceGetVersion(JNIEnv* env))
4341 JVMWrapper("JVM_DTraceGetVersion");
4342 return (jint)JVM_TRACING_DTRACE_VERSION;
4343 JVM_END
4345 JVM_ENTRY(jlong,JVM_DTraceActivate(
4346 JNIEnv* env, jint version, jstring module_name, jint providers_count,
4347 JVM_DTraceProvider* providers))
4348 JVMWrapper("JVM_DTraceActivate");
4349 return DTraceJSDT::activate(
4350 version, module_name, providers_count, providers, CHECK_0);
4351 JVM_END
4353 JVM_ENTRY(jboolean,JVM_DTraceIsProbeEnabled(JNIEnv* env, jmethodID method))
4354 JVMWrapper("JVM_DTraceIsProbeEnabled");
4355 return DTraceJSDT::is_probe_enabled(method);
4356 JVM_END
4358 JVM_ENTRY(void,JVM_DTraceDispose(JNIEnv* env, jlong handle))
4359 JVMWrapper("JVM_DTraceDispose");
4360 DTraceJSDT::dispose(handle);
4361 JVM_END
4363 JVM_ENTRY(jboolean,JVM_DTraceIsSupported(JNIEnv* env))
4364 JVMWrapper("JVM_DTraceIsSupported");
4365 return DTraceJSDT::is_supported();
4366 JVM_END
4368 // Returns an array of all live Thread objects (VM internal JavaThreads,
4369 // jvmti agent threads, and JNI attaching threads are skipped)
4370 // See CR 6404306 regarding JNI attaching threads
4371 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
4372 ResourceMark rm(THREAD);
4373 ThreadsListEnumerator tle(THREAD, false, false);
4374 JvmtiVMObjectAllocEventCollector oam;
4376 int num_threads = tle.num_threads();
4377 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
4378 objArrayHandle threads_ah(THREAD, r);
4380 for (int i = 0; i < num_threads; i++) {
4381 Handle h = tle.get_threadObj(i);
4382 threads_ah->obj_at_put(i, h());
4383 }
4385 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
4386 JVM_END
4389 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
4390 // Return StackTraceElement[][], each element is the stack trace of a thread in
4391 // the corresponding entry in the given threads array
4392 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
4393 JVMWrapper("JVM_DumpThreads");
4394 JvmtiVMObjectAllocEventCollector oam;
4396 // Check if threads is null
4397 if (threads == NULL) {
4398 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
4399 }
4401 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
4402 objArrayHandle ah(THREAD, a);
4403 int num_threads = ah->length();
4404 // check if threads is non-empty array
4405 if (num_threads == 0) {
4406 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
4407 }
4409 // check if threads is not an array of objects of Thread class
4410 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
4411 if (k != SystemDictionary::Thread_klass()) {
4412 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
4413 }
4415 ResourceMark rm(THREAD);
4417 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
4418 for (int i = 0; i < num_threads; i++) {
4419 oop thread_obj = ah->obj_at(i);
4420 instanceHandle h(THREAD, (instanceOop) thread_obj);
4421 thread_handle_array->append(h);
4422 }
4424 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
4425 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
4427 JVM_END
4429 // JVM monitoring and management support
4430 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
4431 return Management::get_jmm_interface(version);
4432 JVM_END
4434 // com.sun.tools.attach.VirtualMachine agent properties support
4435 //
4436 // Initialize the agent properties with the properties maintained in the VM
4437 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
4438 JVMWrapper("JVM_InitAgentProperties");
4439 ResourceMark rm;
4441 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
4443 PUTPROP(props, "sun.java.command", Arguments::java_command());
4444 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
4445 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
4446 return properties;
4447 JVM_END
4449 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
4450 {
4451 JVMWrapper("JVM_GetEnclosingMethodInfo");
4452 JvmtiVMObjectAllocEventCollector oam;
4454 if (ofClass == NULL) {
4455 return NULL;
4456 }
4457 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
4458 // Special handling for primitive objects
4459 if (java_lang_Class::is_primitive(mirror())) {
4460 return NULL;
4461 }
4462 Klass* k = java_lang_Class::as_Klass(mirror());
4463 if (!k->oop_is_instance()) {
4464 return NULL;
4465 }
4466 instanceKlassHandle ik_h(THREAD, k);
4467 int encl_method_class_idx = ik_h->enclosing_method_class_index();
4468 if (encl_method_class_idx == 0) {
4469 return NULL;
4470 }
4471 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
4472 objArrayHandle dest(THREAD, dest_o);
4473 Klass* enc_k = ik_h->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
4474 dest->obj_at_put(0, enc_k->java_mirror());
4475 int encl_method_method_idx = ik_h->enclosing_method_method_index();
4476 if (encl_method_method_idx != 0) {
4477 Symbol* sym = ik_h->constants()->symbol_at(
4478 extract_low_short_from_int(
4479 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
4480 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
4481 dest->obj_at_put(1, str());
4482 sym = ik_h->constants()->symbol_at(
4483 extract_high_short_from_int(
4484 ik_h->constants()->name_and_type_at(encl_method_method_idx)));
4485 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
4486 dest->obj_at_put(2, str());
4487 }
4488 return (jobjectArray) JNIHandles::make_local(dest());
4489 }
4490 JVM_END
4492 JVM_ENTRY(jintArray, JVM_GetThreadStateValues(JNIEnv* env,
4493 jint javaThreadState))
4494 {
4495 // If new thread states are added in future JDK and VM versions,
4496 // this should check if the JDK version is compatible with thread
4497 // states supported by the VM. Return NULL if not compatible.
4498 //
4499 // This function must map the VM java_lang_Thread::ThreadStatus
4500 // to the Java thread state that the JDK supports.
4501 //
4503 typeArrayHandle values_h;
4504 switch (javaThreadState) {
4505 case JAVA_THREAD_STATE_NEW : {
4506 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL);
4507 values_h = typeArrayHandle(THREAD, r);
4508 values_h->int_at_put(0, java_lang_Thread::NEW);
4509 break;
4510 }
4511 case JAVA_THREAD_STATE_RUNNABLE : {
4512 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL);
4513 values_h = typeArrayHandle(THREAD, r);
4514 values_h->int_at_put(0, java_lang_Thread::RUNNABLE);
4515 break;
4516 }
4517 case JAVA_THREAD_STATE_BLOCKED : {
4518 typeArrayOop r = oopFactory::new_typeArray(T_INT, 1, CHECK_NULL);
4519 values_h = typeArrayHandle(THREAD, r);
4520 values_h->int_at_put(0, java_lang_Thread::BLOCKED_ON_MONITOR_ENTER);
4521 break;
4522 }
4523 case JAVA_THREAD_STATE_WAITING : {
4524 typeArrayOop r = oopFactory::new_typeArray(T_INT, 2, CHECK_NULL);
4525 values_h = typeArrayHandle(THREAD, r);
4526 values_h->int_at_put(0, java_lang_Thread::IN_OBJECT_WAIT);
4527 values_h->int_at_put(1, java_lang_Thread::PARKED);
4528 break;
4529 }
4530 case JAVA_THREAD_STATE_TIMED_WAITING : {
4531 typeArrayOop r = oopFactory::new_typeArray(T_INT, 3, CHECK_NULL);
4532 values_h = typeArrayHandle(THREAD, r);
4533 values_h->int_at_put(0, java_lang_Thread::SLEEPING);
4534 values_h->int_at_put(1, java_lang_Thread::IN_OBJECT_WAIT_TIMED);
4535 values_h->int_at_put(2, java_lang_Thread::PARKED_TIMED);
4536 break;
4537 }
4538 case JAVA_THREAD_STATE_TERMINATED : {
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::TERMINATED);
4542 break;
4543 }
4544 default:
4545 // Unknown state - probably incompatible JDK version
4546 return NULL;
4547 }
4549 return (jintArray) JNIHandles::make_local(env, values_h());
4550 }
4551 JVM_END
4554 JVM_ENTRY(jobjectArray, JVM_GetThreadStateNames(JNIEnv* env,
4555 jint javaThreadState,
4556 jintArray values))
4557 {
4558 // If new thread states are added in future JDK and VM versions,
4559 // this should check if the JDK version is compatible with thread
4560 // states supported by the VM. Return NULL if not compatible.
4561 //
4562 // This function must map the VM java_lang_Thread::ThreadStatus
4563 // to the Java thread state that the JDK supports.
4564 //
4566 ResourceMark rm;
4568 // Check if threads is null
4569 if (values == NULL) {
4570 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
4571 }
4573 typeArrayOop v = typeArrayOop(JNIHandles::resolve_non_null(values));
4574 typeArrayHandle values_h(THREAD, v);
4576 objArrayHandle names_h;
4577 switch (javaThreadState) {
4578 case JAVA_THREAD_STATE_NEW : {
4579 assert(values_h->length() == 1 &&
4580 values_h->int_at(0) == java_lang_Thread::NEW,
4581 "Invalid threadStatus value");
4583 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4584 1, /* only 1 substate */
4585 CHECK_NULL);
4586 names_h = objArrayHandle(THREAD, r);
4587 Handle name = java_lang_String::create_from_str("NEW", CHECK_NULL);
4588 names_h->obj_at_put(0, name());
4589 break;
4590 }
4591 case JAVA_THREAD_STATE_RUNNABLE : {
4592 assert(values_h->length() == 1 &&
4593 values_h->int_at(0) == java_lang_Thread::RUNNABLE,
4594 "Invalid threadStatus value");
4596 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4597 1, /* only 1 substate */
4598 CHECK_NULL);
4599 names_h = objArrayHandle(THREAD, r);
4600 Handle name = java_lang_String::create_from_str("RUNNABLE", CHECK_NULL);
4601 names_h->obj_at_put(0, name());
4602 break;
4603 }
4604 case JAVA_THREAD_STATE_BLOCKED : {
4605 assert(values_h->length() == 1 &&
4606 values_h->int_at(0) == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER,
4607 "Invalid threadStatus value");
4609 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4610 1, /* only 1 substate */
4611 CHECK_NULL);
4612 names_h = objArrayHandle(THREAD, r);
4613 Handle name = java_lang_String::create_from_str("BLOCKED", CHECK_NULL);
4614 names_h->obj_at_put(0, name());
4615 break;
4616 }
4617 case JAVA_THREAD_STATE_WAITING : {
4618 assert(values_h->length() == 2 &&
4619 values_h->int_at(0) == java_lang_Thread::IN_OBJECT_WAIT &&
4620 values_h->int_at(1) == java_lang_Thread::PARKED,
4621 "Invalid threadStatus value");
4622 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4623 2, /* number of substates */
4624 CHECK_NULL);
4625 names_h = objArrayHandle(THREAD, r);
4626 Handle name0 = java_lang_String::create_from_str("WAITING.OBJECT_WAIT",
4627 CHECK_NULL);
4628 Handle name1 = java_lang_String::create_from_str("WAITING.PARKED",
4629 CHECK_NULL);
4630 names_h->obj_at_put(0, name0());
4631 names_h->obj_at_put(1, name1());
4632 break;
4633 }
4634 case JAVA_THREAD_STATE_TIMED_WAITING : {
4635 assert(values_h->length() == 3 &&
4636 values_h->int_at(0) == java_lang_Thread::SLEEPING &&
4637 values_h->int_at(1) == java_lang_Thread::IN_OBJECT_WAIT_TIMED &&
4638 values_h->int_at(2) == java_lang_Thread::PARKED_TIMED,
4639 "Invalid threadStatus value");
4640 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4641 3, /* number of substates */
4642 CHECK_NULL);
4643 names_h = objArrayHandle(THREAD, r);
4644 Handle name0 = java_lang_String::create_from_str("TIMED_WAITING.SLEEPING",
4645 CHECK_NULL);
4646 Handle name1 = java_lang_String::create_from_str("TIMED_WAITING.OBJECT_WAIT",
4647 CHECK_NULL);
4648 Handle name2 = java_lang_String::create_from_str("TIMED_WAITING.PARKED",
4649 CHECK_NULL);
4650 names_h->obj_at_put(0, name0());
4651 names_h->obj_at_put(1, name1());
4652 names_h->obj_at_put(2, name2());
4653 break;
4654 }
4655 case JAVA_THREAD_STATE_TERMINATED : {
4656 assert(values_h->length() == 1 &&
4657 values_h->int_at(0) == java_lang_Thread::TERMINATED,
4658 "Invalid threadStatus value");
4659 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
4660 1, /* only 1 substate */
4661 CHECK_NULL);
4662 names_h = objArrayHandle(THREAD, r);
4663 Handle name = java_lang_String::create_from_str("TERMINATED", CHECK_NULL);
4664 names_h->obj_at_put(0, name());
4665 break;
4666 }
4667 default:
4668 // Unknown state - probably incompatible JDK version
4669 return NULL;
4670 }
4671 return (jobjectArray) JNIHandles::make_local(env, names_h());
4672 }
4673 JVM_END
4675 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
4676 {
4677 memset(info, 0, info_size);
4679 info->jvm_version = Abstract_VM_Version::jvm_version();
4680 info->update_version = 0; /* 0 in HotSpot Express VM */
4681 info->special_update_version = 0; /* 0 in HotSpot Express VM */
4683 // when we add a new capability in the jvm_version_info struct, we should also
4684 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
4685 // counter defined in runtimeService.cpp.
4686 info->is_attachable = AttachListener::is_attach_supported();
4687 }
4688 JVM_END