1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/modules.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/stringTable.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "gc/shared/collectedHeap.inline.hpp"
40 #include "interpreter/bytecode.hpp"
41 #include "interpreter/bytecodeUtils.hpp"
42 #include "jfr/jfrEvents.hpp"
43 #include "logging/log.hpp"
44 #include "memory/heapShared.hpp"
45 #include "memory/oopFactory.hpp"
46 #include "memory/referenceType.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/access.inline.hpp"
50 #include "oops/constantPool.hpp"
51 #include "oops/fieldStreams.inline.hpp"
52 #include "oops/instanceKlass.hpp"
53 #include "oops/method.hpp"
54 #include "oops/objArrayKlass.hpp"
55 #include "oops/objArrayOop.inline.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "prims/jvm_misc.hpp"
58 #include "prims/jvmtiExport.hpp"
59 #include "prims/jvmtiThreadState.hpp"
60 #include "prims/nativeLookup.hpp"
61 #include "prims/stackwalk.hpp"
62 #include "runtime/arguments.hpp"
63 #include "runtime/atomic.hpp"
64 #include "runtime/handles.inline.hpp"
65 #include "runtime/init.hpp"
66 #include "runtime/interfaceSupport.inline.hpp"
67 #include "runtime/deoptimization.hpp"
68 #include "runtime/handshake.hpp"
69 #include "runtime/java.hpp"
70 #include "runtime/javaCalls.hpp"
71 #include "runtime/jfieldIDWorkaround.hpp"
72 #include "runtime/jniHandles.inline.hpp"
73 #include "runtime/os.inline.hpp"
74 #include "runtime/perfData.hpp"
75 #include "runtime/reflection.hpp"
76 #include "runtime/synchronizer.hpp"
77 #include "runtime/thread.inline.hpp"
78 #include "runtime/threadSMR.hpp"
79 #include "runtime/vframe.inline.hpp"
80 #include "runtime/vmOperations.hpp"
81 #include "runtime/vm_version.hpp"
82 #include "services/attachListener.hpp"
83 #include "services/management.hpp"
84 #include "services/threadService.hpp"
85 #include "utilities/copy.hpp"
86 #include "utilities/defaultStream.hpp"
87 #include "utilities/dtrace.hpp"
88 #include "utilities/events.hpp"
89 #include "utilities/histogram.hpp"
90 #include "utilities/macros.hpp"
91 #include "utilities/utf8.hpp"
92 #if INCLUDE_CDS
93 #include "classfile/systemDictionaryShared.hpp"
94 #endif
95
96 #include <errno.h>
97
98 /*
99 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
100 such ctors and calls MUST NOT come between an oop declaration/init and its
101 usage because if objects are move this may cause various memory stomps, bus
102 errors and segfaults. Here is a cookbook for causing so called "naked oop
103 failures":
104
105 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
106 JVMWrapper("JVM_GetClassDeclaredFields");
107
108 // Object address to be held directly in mirror & not visible to GC
109 oop mirror = JNIHandles::resolve_non_null(ofClass);
110
111 // If this ctor can hit a safepoint, moving objects around, then
112 ComplexConstructor foo;
113
114 // Boom! mirror may point to JUNK instead of the intended object
115 (some dereference of mirror)
116
117 // Here's another call that may block for GC, making mirror stale
118 MutexLocker ml(some_lock);
119
120 // And here's an initializer that can result in a stale oop
121 // all in one step.
122 oop o = call_that_can_throw_exception(TRAPS);
123
124
125 The solution is to keep the oop declaration BELOW the ctor or function
126 call that might cause a GC, do another resolve to reassign the oop, or
127 consider use of a Handle instead of an oop so there is immunity from object
128 motion. But note that the "QUICK" entries below do not have a handlemark
129 and thus can only support use of handles passed in.
130 */
131
132 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
133 ResourceMark rm;
134 int line_number = -1;
135 const char * source_file = NULL;
136 const char * trace = "explicit";
137 InstanceKlass* caller = NULL;
138 JavaThread* jthread = JavaThread::current();
139 if (jthread->has_last_Java_frame()) {
140 vframeStream vfst(jthread);
141
142 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
143 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
144 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
145 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
146 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
147
148 Method* last_caller = NULL;
149
150 while (!vfst.at_end()) {
151 Method* m = vfst.method();
152 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
153 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
154 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
155 break;
156 }
157 last_caller = m;
158 vfst.next();
159 }
160 // if this is called from Class.forName0 and that is called from Class.forName,
161 // then print the caller of Class.forName. If this is Class.loadClass, then print
162 // that caller, otherwise keep quiet since this should be picked up elsewhere.
163 bool found_it = false;
164 if (!vfst.at_end() &&
165 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
166 vfst.method()->name() == vmSymbols::forName0_name()) {
167 vfst.next();
168 if (!vfst.at_end() &&
169 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
170 vfst.method()->name() == vmSymbols::forName_name()) {
171 vfst.next();
172 found_it = true;
173 }
174 } else if (last_caller != NULL &&
175 last_caller->method_holder()->name() ==
176 vmSymbols::java_lang_ClassLoader() &&
177 last_caller->name() == vmSymbols::loadClass_name()) {
178 found_it = true;
179 } else if (!vfst.at_end()) {
180 if (vfst.method()->is_native()) {
181 // JNI call
182 found_it = true;
183 }
184 }
185 if (found_it && !vfst.at_end()) {
186 // found the caller
187 caller = vfst.method()->method_holder();
188 line_number = vfst.method()->line_number_from_bci(vfst.bci());
189 if (line_number == -1) {
190 // show method name if it's a native method
191 trace = vfst.method()->name_and_sig_as_C_string();
192 }
193 Symbol* s = caller->source_file_name();
194 if (s != NULL) {
195 source_file = s->as_C_string();
196 }
197 }
198 }
199 if (caller != NULL) {
200 if (to_class != caller) {
201 const char * from = caller->external_name();
202 const char * to = to_class->external_name();
203 // print in a single call to reduce interleaving between threads
204 if (source_file != NULL) {
205 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
206 } else {
207 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
208 }
209 }
210 }
211 }
212
213 void trace_class_resolution(Klass* to_class) {
214 EXCEPTION_MARK;
215 trace_class_resolution_impl(to_class, THREAD);
216 if (HAS_PENDING_EXCEPTION) {
217 CLEAR_PENDING_EXCEPTION;
218 }
219 }
220
221 // Wrapper to trace JVM functions
222
223 #ifdef ASSERT
224 Histogram* JVMHistogram;
225 volatile int JVMHistogram_lock = 0;
226
227 class JVMHistogramElement : public HistogramElement {
228 public:
229 JVMHistogramElement(const char* name);
230 };
231
232 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
233 _name = elementName;
234 uintx count = 0;
235
236 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) {
237 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) {
238 count +=1;
239 if ( (WarnOnStalledSpinLock > 0)
240 && (count % WarnOnStalledSpinLock == 0)) {
241 warning("JVMHistogram_lock seems to be stalled");
242 }
243 }
244 }
245
246 if(JVMHistogram == NULL)
247 JVMHistogram = new Histogram("JVM Call Counts",100);
248
249 JVMHistogram->add_element(this);
250 Atomic::dec(&JVMHistogram_lock);
251 }
252
253 #define JVMCountWrapper(arg) \
254 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
255 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
256
257 #define JVMWrapper(arg) JVMCountWrapper(arg);
258 #else
259 #define JVMWrapper(arg)
260 #endif
261
262
263 // Interface version /////////////////////////////////////////////////////////////////////
264
265
266 JVM_LEAF(jint, JVM_GetInterfaceVersion())
267 return JVM_INTERFACE_VERSION;
268 JVM_END
269
270
271 // java.lang.System //////////////////////////////////////////////////////////////////////
272
273
274 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
275 JVMWrapper("JVM_CurrentTimeMillis");
276 return os::javaTimeMillis();
277 JVM_END
278
279 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
280 JVMWrapper("JVM_NanoTime");
281 return os::javaTimeNanos();
282 JVM_END
283
284 // The function below is actually exposed by jdk.internal.misc.VM and not
285 // java.lang.System, but we choose to keep it here so that it stays next
286 // to JVM_CurrentTimeMillis and JVM_NanoTime
287
288 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
289 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
290
291 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
292 JVMWrapper("JVM_GetNanoTimeAdjustment");
293 jlong seconds;
294 jlong nanos;
295
296 os::javaTimeSystemUTC(seconds, nanos);
297
298 // We're going to verify that the result can fit in a long.
299 // For that we need the difference in seconds between 'seconds'
300 // and 'offset_secs' to be such that:
301 // |seconds - offset_secs| < (2^63/10^9)
302 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
303 // which makes |seconds - offset_secs| < 2^33
304 // and we will prefer +/- 2^32 as the maximum acceptable diff
305 // as 2^32 has a more natural feel than 2^33...
306 //
307 // So if |seconds - offset_secs| >= 2^32 - we return a special
308 // sentinel value (-1) which the caller should take as an
309 // exception value indicating that the offset given to us is
310 // too far from range of the current time - leading to too big
311 // a nano adjustment. The caller is expected to recover by
312 // computing a more accurate offset and calling this method
313 // again. (For the record 2^32 secs is ~136 years, so that
314 // should rarely happen)
315 //
316 jlong diff = seconds - offset_secs;
317 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
318 return -1; // sentinel value: the offset is too far off the target
319 }
320
321 // return the adjustment. If you compute a time by adding
322 // this number of nanoseconds along with the number of seconds
323 // in the offset you should get the current UTC time.
324 return (diff * (jlong)1000000000) + nanos;
325 JVM_END
326
327 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
328 jobject dst, jint dst_pos, jint length))
329 JVMWrapper("JVM_ArrayCopy");
330 // Check if we have null pointers
331 if (src == NULL || dst == NULL) {
332 THROW(vmSymbols::java_lang_NullPointerException());
333 }
334 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
335 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
336 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
337 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
338 // Do copy
339 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
340 JVM_END
341
342
343 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
344 JavaValue r(T_OBJECT);
345 // public synchronized Object put(Object key, Object value);
346 HandleMark hm(THREAD);
347 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
348 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
349 JavaCalls::call_virtual(&r,
350 props,
351 SystemDictionary::Properties_klass(),
352 vmSymbols::put_name(),
353 vmSymbols::object_object_object_signature(),
354 key_str,
355 value_str,
356 THREAD);
357 }
358
359
360 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
361
362 /*
363 * Return all of the system properties in a Java String array with alternating
364 * names and values from the jvm SystemProperty.
365 * Which includes some internal and all commandline -D defined properties.
366 */
367 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
368 JVMWrapper("JVM_GetProperties");
369 ResourceMark rm(THREAD);
370 HandleMark hm(THREAD);
371 int ndx = 0;
372 int fixedCount = 2;
373
374 SystemProperty* p = Arguments::system_properties();
375 int count = Arguments::PropertyList_count(p);
376
377 // Allocate result String array
378 InstanceKlass* ik = SystemDictionary::String_klass();
379 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
380 objArrayHandle result_h(THREAD, r);
381
382 while (p != NULL) {
383 const char * key = p->key();
384 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
385 const char * value = p->value();
386 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
387 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
388 result_h->obj_at_put(ndx * 2, key_str());
389 result_h->obj_at_put(ndx * 2 + 1, value_str());
390 ndx++;
391 }
392 p = p->next();
393 }
394
395 // Convert the -XX:MaxDirectMemorySize= command line flag
396 // to the sun.nio.MaxDirectMemorySize property.
397 // Do this after setting user properties to prevent people
398 // from setting the value with a -D option, as requested.
399 // Leave empty if not supplied
400 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
401 char as_chars[256];
402 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
403 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
404 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
405 result_h->obj_at_put(ndx * 2, key_str());
406 result_h->obj_at_put(ndx * 2 + 1, value_str());
407 ndx++;
408 }
409
410 // JVM monitoring and management support
411 // Add the sun.management.compiler property for the compiler's name
412 {
413 #undef CSIZE
414 #if defined(_LP64) || defined(_WIN64)
415 #define CSIZE "64-Bit "
416 #else
417 #define CSIZE
418 #endif // 64bit
419
420 #ifdef TIERED
421 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
422 #else
423 #if defined(COMPILER1)
424 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
425 #elif defined(COMPILER2)
426 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
427 #elif INCLUDE_JVMCI
428 #error "INCLUDE_JVMCI should imply TIERED"
429 #else
430 const char* compiler_name = "";
431 #endif // compilers
432 #endif // TIERED
433
434 if (*compiler_name != '\0' &&
435 (Arguments::mode() != Arguments::_int)) {
436 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
437 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
438 result_h->obj_at_put(ndx * 2, key_str());
439 result_h->obj_at_put(ndx * 2 + 1, value_str());
440 ndx++;
441 }
442 }
443
444 return (jobjectArray) JNIHandles::make_local(env, result_h());
445 JVM_END
446
447
448 /*
449 * Return the temporary directory that the VM uses for the attach
450 * and perf data files.
451 *
452 * It is important that this directory is well-known and the
453 * same for all VM instances. It cannot be affected by configuration
454 * variables such as java.io.tmpdir.
455 */
456 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
457 JVMWrapper("JVM_GetTemporaryDirectory");
458 HandleMark hm(THREAD);
459 const char* temp_dir = os::get_temp_directory();
460 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
461 return (jstring) JNIHandles::make_local(env, h());
462 JVM_END
463
464
465 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
466
467 extern volatile jint vm_created;
468
469 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
470 JVMWrapper("JVM_BeforeHalt");
471 EventShutdown event;
472 if (event.should_commit()) {
473 event.set_reason("Shutdown requested from Java");
474 event.commit();
475 }
476 JVM_END
477
478
479 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
480 before_exit(thread);
481 vm_exit(code);
482 JVM_END
483
484
485 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
486 JVMWrapper("JVM_GC");
487 if (!DisableExplicitGC) {
488 if (AsyncDeflateIdleMonitors) {
489 // AsyncDeflateIdleMonitors needs to know when System.gc() is
490 // called so any special deflation can be done at a safepoint.
491 ObjectSynchronizer::set_is_special_deflation_requested(true);
492 }
493 Universe::heap()->collect(GCCause::_java_lang_system_gc);
494 }
495 JVM_END
496
497
498 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
499 JVMWrapper("JVM_MaxObjectInspectionAge");
500 return Universe::heap()->millis_since_last_gc();
501 JVM_END
502
503
504 static inline jlong convert_size_t_to_jlong(size_t val) {
505 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
506 NOT_LP64 (return (jlong)val;)
507 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
508 }
509
510 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
511 JVMWrapper("JVM_TotalMemory");
512 size_t n = Universe::heap()->capacity();
513 return convert_size_t_to_jlong(n);
514 JVM_END
515
516
517 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
518 JVMWrapper("JVM_FreeMemory");
519 size_t n = Universe::heap()->unused();
520 return convert_size_t_to_jlong(n);
521 JVM_END
522
523
524 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
525 JVMWrapper("JVM_MaxMemory");
526 size_t n = Universe::heap()->max_capacity();
527 return convert_size_t_to_jlong(n);
528 JVM_END
529
530
531 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
532 JVMWrapper("JVM_ActiveProcessorCount");
533 return os::active_processor_count();
534 JVM_END
535
536
537
538 // java.lang.Throwable //////////////////////////////////////////////////////
539
540 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
541 JVMWrapper("JVM_FillInStackTrace");
542 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
543 java_lang_Throwable::fill_in_stack_trace(exception);
544 JVM_END
545
546 // java.lang.NullPointerException ///////////////////////////////////////////
547
548 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
549 if (!ShowCodeDetailsInExceptionMessages) return NULL;
550
551 oop exc = JNIHandles::resolve_non_null(throwable);
552
553 Method* method;
554 int bci;
555 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
556 return NULL;
557 }
558 if (method->is_native()) {
559 return NULL;
560 }
561
562 stringStream ss;
563 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
564 if (ok) {
565 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_0);
566 return (jstring) JNIHandles::make_local(env, result);
567 } else {
568 return NULL;
569 }
570 JVM_END
571
572 // java.lang.StackTraceElement //////////////////////////////////////////////
573
574
575 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
576 JVMWrapper("JVM_InitStackTraceElementArray");
577 Handle exception(THREAD, JNIHandles::resolve(throwable));
578 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
579 objArrayHandle stack_trace(THREAD, st);
580 // Fill in the allocated stack trace
581 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
582 JVM_END
583
584
585 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
586 JVMWrapper("JVM_InitStackTraceElement");
587 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
588 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
589 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
590 JVM_END
591
592
593 // java.lang.StackWalker //////////////////////////////////////////////////////
594
595
596 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
597 jint skip_frames, jint frame_count, jint start_index,
598 jobjectArray frames))
599 JVMWrapper("JVM_CallStackWalk");
600 JavaThread* jt = (JavaThread*) THREAD;
601 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
602 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
603 }
604
605 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
606
607 // frames array is a Class<?>[] array when only getting caller reference,
608 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
609 // be null.
610 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
611 objArrayHandle frames_array_h(THREAD, fa);
612
613 int limit = start_index + frame_count;
614 if (frames_array_h->length() < limit) {
615 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
616 }
617
618 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
619 start_index, frames_array_h, CHECK_NULL);
620 return JNIHandles::make_local(env, result);
621 JVM_END
622
623
624 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
625 jint frame_count, jint start_index,
626 jobjectArray frames))
627 JVMWrapper("JVM_MoreStackWalk");
628 JavaThread* jt = (JavaThread*) THREAD;
629
630 // frames array is a Class<?>[] array when only getting caller reference,
631 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
632 // be null.
633 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
634 objArrayHandle frames_array_h(THREAD, fa);
635
636 int limit = start_index+frame_count;
637 if (frames_array_h->length() < limit) {
638 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
639 }
640
641 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
642 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
643 start_index, frames_array_h, THREAD);
644 JVM_END
645
646 // java.lang.Object ///////////////////////////////////////////////
647
648
649 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
650 JVMWrapper("JVM_IHashCode");
651 // as implemented in the classic virtual machine; return 0 if object is NULL
652 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
653 JVM_END
654
655
656 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
657 JVMWrapper("JVM_MonitorWait");
658 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
659 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
660 if (JvmtiExport::should_post_monitor_wait()) {
661 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
662
663 // The current thread already owns the monitor and it has not yet
664 // been added to the wait queue so the current thread cannot be
665 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
666 // event handler cannot accidentally consume an unpark() meant for
667 // the ParkEvent associated with this ObjectMonitor.
668 }
669 ObjectSynchronizer::wait(obj, ms, CHECK);
670 JVM_END
671
672
673 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
674 JVMWrapper("JVM_MonitorNotify");
675 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
676 ObjectSynchronizer::notify(obj, CHECK);
677 JVM_END
678
679
680 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
681 JVMWrapper("JVM_MonitorNotifyAll");
682 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
683 ObjectSynchronizer::notifyall(obj, CHECK);
684 JVM_END
685
686
687 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
688 JVMWrapper("JVM_Clone");
689 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
690 Klass* klass = obj->klass();
691 JvmtiVMObjectAllocEventCollector oam;
692
693 #ifdef ASSERT
694 // Just checking that the cloneable flag is set correct
695 if (obj->is_array()) {
696 guarantee(klass->is_cloneable(), "all arrays are cloneable");
697 } else {
698 guarantee(obj->is_instance(), "should be instanceOop");
699 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
700 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
701 }
702 #endif
703
704 // Check if class of obj supports the Cloneable interface.
705 // All arrays are considered to be cloneable (See JLS 20.1.5).
706 // All j.l.r.Reference classes are considered non-cloneable.
707 if (!klass->is_cloneable() ||
708 (klass->is_instance_klass() &&
709 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
710 ResourceMark rm(THREAD);
711 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
712 }
713
714 // Make shallow object copy
715 const int size = obj->size();
716 oop new_obj_oop = NULL;
717 if (obj->is_array()) {
718 const int length = ((arrayOop)obj())->length();
719 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
720 /* do_zero */ true, CHECK_NULL);
721 } else {
722 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
723 }
724
725 HeapAccess<>::clone(obj(), new_obj_oop, size);
726
727 Handle new_obj(THREAD, new_obj_oop);
728 // Caution: this involves a java upcall, so the clone should be
729 // "gc-robust" by this stage.
730 if (klass->has_finalizer()) {
731 assert(obj->is_instance(), "should be instanceOop");
732 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
733 new_obj = Handle(THREAD, new_obj_oop);
734 }
735
736 return JNIHandles::make_local(env, new_obj());
737 JVM_END
738
739 // java.io.File ///////////////////////////////////////////////////////////////
740
741 JVM_LEAF(char*, JVM_NativePath(char* path))
742 JVMWrapper("JVM_NativePath");
743 return os::native_path(path);
744 JVM_END
745
746
747 // Misc. class handling ///////////////////////////////////////////////////////////
748
749
750 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
751 JVMWrapper("JVM_GetCallerClass");
752
753 // Getting the class of the caller frame.
754 //
755 // The call stack at this point looks something like this:
756 //
757 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
758 // [1] [ @CallerSensitive API.method ]
759 // [.] [ (skipped intermediate frames) ]
760 // [n] [ caller ]
761 vframeStream vfst(thread);
762 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
763 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
764 Method* m = vfst.method();
765 assert(m != NULL, "sanity");
766 switch (n) {
767 case 0:
768 // This must only be called from Reflection.getCallerClass
769 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
770 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
771 }
772 // fall-through
773 case 1:
774 // Frame 0 and 1 must be caller sensitive.
775 if (!m->caller_sensitive()) {
776 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
777 }
778 break;
779 default:
780 if (!m->is_ignored_by_security_stack_walk()) {
781 // We have reached the desired frame; return the holder class.
782 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
783 }
784 break;
785 }
786 }
787 return NULL;
788 JVM_END
789
790
791 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
792 JVMWrapper("JVM_FindPrimitiveClass");
793 oop mirror = NULL;
794 BasicType t = name2type(utf);
795 if (t != T_ILLEGAL && !is_reference_type(t)) {
796 mirror = Universe::java_mirror(t);
797 }
798 if (mirror == NULL) {
799 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
800 } else {
801 return (jclass) JNIHandles::make_local(env, mirror);
802 }
803 JVM_END
804
805
806 // Returns a class loaded by the bootstrap class loader; or null
807 // if not found. ClassNotFoundException is not thrown.
808 // FindClassFromBootLoader is exported to the launcher for windows.
809 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
810 const char* name))
811 JVMWrapper("JVM_FindClassFromBootLoader");
812
813 // Java libraries should ensure that name is never null...
814 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
815 // It's impossible to create this class; the name cannot fit
816 // into the constant pool.
817 return NULL;
818 }
819
820 TempNewSymbol h_name = SymbolTable::new_symbol(name);
821 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
822 if (k == NULL) {
823 return NULL;
824 }
825
826 if (log_is_enabled(Debug, class, resolve)) {
827 trace_class_resolution(k);
828 }
829 return (jclass) JNIHandles::make_local(env, k->java_mirror());
830 JVM_END
831
832 // Find a class with this name in this loader, using the caller's protection domain.
833 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
834 jboolean init, jobject loader,
835 jclass caller))
836 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
837 // Java libraries should ensure that name is never null...
838 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
839 // It's impossible to create this class; the name cannot fit
840 // into the constant pool.
841 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
842 }
843
844 TempNewSymbol h_name = SymbolTable::new_symbol(name);
845
846 oop loader_oop = JNIHandles::resolve(loader);
847 oop from_class = JNIHandles::resolve(caller);
848 oop protection_domain = NULL;
849 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
850 // NPE. Put it in another way, the bootstrap class loader has all permission and
851 // thus no checkPackageAccess equivalence in the VM class loader.
852 // The caller is also passed as NULL by the java code if there is no security
853 // manager to avoid the performance cost of getting the calling class.
854 if (from_class != NULL && loader_oop != NULL) {
855 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
856 }
857
858 Handle h_loader(THREAD, loader_oop);
859 Handle h_prot(THREAD, protection_domain);
860 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
861 h_prot, false, THREAD);
862
863 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
864 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
865 }
866 return result;
867 JVM_END
868
869 // Currently only called from the old verifier.
870 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
871 jboolean init, jclass from))
872 JVMWrapper("JVM_FindClassFromClass");
873 if (name == NULL) {
874 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
875 }
876 if ((int)strlen(name) > Symbol::max_length()) {
877 // It's impossible to create this class; the name cannot fit
878 // into the constant pool.
879 Exceptions::fthrow(THREAD_AND_LOCATION,
880 vmSymbols::java_lang_NoClassDefFoundError(),
881 "Class name exceeds maximum length of %d: %s",
882 Symbol::max_length(),
883 name);
884 return 0;
885 }
886 TempNewSymbol h_name = SymbolTable::new_symbol(name);
887 oop from_class_oop = JNIHandles::resolve(from);
888 Klass* from_class = (from_class_oop == NULL)
889 ? (Klass*)NULL
890 : java_lang_Class::as_Klass(from_class_oop);
891 oop class_loader = NULL;
892 oop protection_domain = NULL;
893 if (from_class != NULL) {
894 class_loader = from_class->class_loader();
895 protection_domain = from_class->protection_domain();
896 }
897 Handle h_loader(THREAD, class_loader);
898 Handle h_prot (THREAD, protection_domain);
899 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
900 h_prot, true, thread);
901
902 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
903 // this function is generally only used for class loading during verification.
904 ResourceMark rm;
905 oop from_mirror = JNIHandles::resolve_non_null(from);
906 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
907 const char * from_name = from_class->external_name();
908
909 oop mirror = JNIHandles::resolve_non_null(result);
910 Klass* to_class = java_lang_Class::as_Klass(mirror);
911 const char * to = to_class->external_name();
912 log_debug(class, resolve)("%s %s (verification)", from_name, to);
913 }
914
915 return result;
916 JVM_END
917
918 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
919 if (loader.is_null()) {
920 return;
921 }
922
923 // check whether the current caller thread holds the lock or not.
924 // If not, increment the corresponding counter
925 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
926 ObjectSynchronizer::owner_self) {
927 counter->inc();
928 }
929 }
930
931 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
932 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
933 jobject loader, const jbyte *buf,
934 jsize len, jobject pd, const char *source,
935 TRAPS) {
936 if (source == NULL) source = "__JVM_DefineClass__";
937
938 assert(THREAD->is_Java_thread(), "must be a JavaThread");
939 JavaThread* jt = (JavaThread*) THREAD;
940
941 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
942 ClassLoader::perf_define_appclass_selftime(),
943 ClassLoader::perf_define_appclasses(),
944 jt->get_thread_stat()->perf_recursion_counts_addr(),
945 jt->get_thread_stat()->perf_timers_addr(),
946 PerfClassTraceTime::DEFINE_CLASS);
947
948 if (UsePerfData) {
949 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
950 }
951
952 // Since exceptions can be thrown, class initialization can take place
953 // if name is NULL no check for class name in .class stream has to be made.
954 TempNewSymbol class_name = NULL;
955 if (name != NULL) {
956 const int str_len = (int)strlen(name);
957 if (str_len > Symbol::max_length()) {
958 // It's impossible to create this class; the name cannot fit
959 // into the constant pool.
960 Exceptions::fthrow(THREAD_AND_LOCATION,
961 vmSymbols::java_lang_NoClassDefFoundError(),
962 "Class name exceeds maximum length of %d: %s",
963 Symbol::max_length(),
964 name);
965 return 0;
966 }
967 class_name = SymbolTable::new_symbol(name, str_len);
968 }
969
970 ResourceMark rm(THREAD);
971 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
972 Handle class_loader (THREAD, JNIHandles::resolve(loader));
973 if (UsePerfData) {
974 is_lock_held_by_thread(class_loader,
975 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
976 THREAD);
977 }
978 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
979 Klass* k = SystemDictionary::resolve_from_stream(class_name,
980 class_loader,
981 protection_domain,
982 &st,
983 CHECK_NULL);
984
985 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
986 trace_class_resolution(k);
987 }
988
989 return (jclass) JNIHandles::make_local(env, k->java_mirror());
990 }
991
992
993 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
994 JVMWrapper("JVM_DefineClass");
995
996 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
997 JVM_END
998
999
1000 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1001 JVMWrapper("JVM_DefineClassWithSource");
1002
1003 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
1004 JVM_END
1005
1006 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1007 JVMWrapper("JVM_FindLoadedClass");
1008 ResourceMark rm(THREAD);
1009
1010 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1011 char* str = java_lang_String::as_utf8_string(h_name());
1012
1013 // Sanity check, don't expect null
1014 if (str == NULL) return NULL;
1015
1016 // Internalize the string, converting '.' to '/' in string.
1017 char* p = (char*)str;
1018 while (*p != '\0') {
1019 if (*p == '.') {
1020 *p = '/';
1021 }
1022 p++;
1023 }
1024
1025 const int str_len = (int)(p - str);
1026 if (str_len > Symbol::max_length()) {
1027 // It's impossible to create this class; the name cannot fit
1028 // into the constant pool.
1029 return NULL;
1030 }
1031 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1032
1033 // Security Note:
1034 // The Java level wrapper will perform the necessary security check allowing
1035 // us to pass the NULL as the initiating class loader.
1036 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1037 if (UsePerfData) {
1038 is_lock_held_by_thread(h_loader,
1039 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1040 THREAD);
1041 }
1042
1043 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1044 h_loader,
1045 Handle(),
1046 CHECK_NULL);
1047 #if INCLUDE_CDS
1048 if (k == NULL) {
1049 // If the class is not already loaded, try to see if it's in the shared
1050 // archive for the current classloader (h_loader).
1051 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1052 }
1053 #endif
1054 return (k == NULL) ? NULL :
1055 (jclass) JNIHandles::make_local(env, k->java_mirror());
1056 JVM_END
1057
1058 // Module support //////////////////////////////////////////////////////////////////////////////
1059
1060 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1061 jstring location, const char* const* packages, jsize num_packages))
1062 JVMWrapper("JVM_DefineModule");
1063 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1064 JVM_END
1065
1066 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1067 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1068 Modules::set_bootloader_unnamed_module(module, CHECK);
1069 JVM_END
1070
1071 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1072 JVMWrapper("JVM_AddModuleExports");
1073 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1074 JVM_END
1075
1076 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1077 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1078 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1079 JVM_END
1080
1081 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1082 JVMWrapper("JVM_AddModuleExportsToAll");
1083 Modules::add_module_exports(from_module, package, NULL, CHECK);
1084 JVM_END
1085
1086 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1087 JVMWrapper("JVM_AddReadsModule");
1088 Modules::add_reads_module(from_module, source_module, CHECK);
1089 JVM_END
1090
1091 // Reflection support //////////////////////////////////////////////////////////////////////////////
1092
1093 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1094 assert (cls != NULL, "illegal class");
1095 JVMWrapper("JVM_InitClassName");
1096 JvmtiVMObjectAllocEventCollector oam;
1097 ResourceMark rm(THREAD);
1098 HandleMark hm(THREAD);
1099 Handle java_class(THREAD, JNIHandles::resolve(cls));
1100 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1101 return (jstring) JNIHandles::make_local(env, result);
1102 JVM_END
1103
1104
1105 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1106 JVMWrapper("JVM_GetClassInterfaces");
1107 JvmtiVMObjectAllocEventCollector oam;
1108 oop mirror = JNIHandles::resolve_non_null(cls);
1109
1110 // Special handling for primitive objects
1111 if (java_lang_Class::is_primitive(mirror)) {
1112 // Primitive objects does not have any interfaces
1113 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1114 return (jobjectArray) JNIHandles::make_local(env, r);
1115 }
1116
1117 Klass* klass = java_lang_Class::as_Klass(mirror);
1118 // Figure size of result array
1119 int size;
1120 if (klass->is_instance_klass()) {
1121 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1122 } else {
1123 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1124 size = 2;
1125 }
1126
1127 // Allocate result array
1128 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1129 objArrayHandle result (THREAD, r);
1130 // Fill in result
1131 if (klass->is_instance_klass()) {
1132 // Regular instance klass, fill in all local interfaces
1133 for (int index = 0; index < size; index++) {
1134 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1135 result->obj_at_put(index, k->java_mirror());
1136 }
1137 } else {
1138 // All arrays implement java.lang.Cloneable and java.io.Serializable
1139 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1140 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1141 }
1142 return (jobjectArray) JNIHandles::make_local(env, result());
1143 JVM_END
1144
1145
1146 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1147 JVMWrapper("JVM_IsInterface");
1148 oop mirror = JNIHandles::resolve_non_null(cls);
1149 if (java_lang_Class::is_primitive(mirror)) {
1150 return JNI_FALSE;
1151 }
1152 Klass* k = java_lang_Class::as_Klass(mirror);
1153 jboolean result = k->is_interface();
1154 assert(!result || k->is_instance_klass(),
1155 "all interfaces are instance types");
1156 // The compiler intrinsic for isInterface tests the
1157 // Klass::_access_flags bits in the same way.
1158 return result;
1159 JVM_END
1160
1161
1162 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1163 JVMWrapper("JVM_GetClassSigners");
1164 JvmtiVMObjectAllocEventCollector oam;
1165 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1166 // There are no signers for primitive types
1167 return NULL;
1168 }
1169
1170 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1171
1172 // If there are no signers set in the class, or if the class
1173 // is an array, return NULL.
1174 if (signers == NULL) return NULL;
1175
1176 // copy of the signers array
1177 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1178 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1179 for (int index = 0; index < signers->length(); index++) {
1180 signers_copy->obj_at_put(index, signers->obj_at(index));
1181 }
1182
1183 // return the copy
1184 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1185 JVM_END
1186
1187
1188 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1189 JVMWrapper("JVM_SetClassSigners");
1190 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1191 // This call is ignored for primitive types and arrays.
1192 // Signers are only set once, ClassLoader.java, and thus shouldn't
1193 // be called with an array. Only the bootstrap loader creates arrays.
1194 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1195 if (k->is_instance_klass()) {
1196 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1197 }
1198 }
1199 JVM_END
1200
1201
1202 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1203 JVMWrapper("JVM_GetProtectionDomain");
1204 if (JNIHandles::resolve(cls) == NULL) {
1205 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1206 }
1207
1208 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1209 // Primitive types does not have a protection domain.
1210 return NULL;
1211 }
1212
1213 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1214 return (jobject) JNIHandles::make_local(env, pd);
1215 JVM_END
1216
1217
1218 // Returns the inherited_access_control_context field of the running thread.
1219 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1220 JVMWrapper("JVM_GetInheritedAccessControlContext");
1221 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1222 return JNIHandles::make_local(env, result);
1223 JVM_END
1224
1225 class RegisterArrayForGC {
1226 private:
1227 JavaThread *_thread;
1228 public:
1229 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1230 _thread = thread;
1231 _thread->register_array_for_gc(array);
1232 }
1233
1234 ~RegisterArrayForGC() {
1235 _thread->register_array_for_gc(NULL);
1236 }
1237 };
1238
1239
1240 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1241 JVMWrapper("JVM_GetStackAccessControlContext");
1242 if (!UsePrivilegedStack) return NULL;
1243
1244 ResourceMark rm(THREAD);
1245 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1246 JvmtiVMObjectAllocEventCollector oam;
1247
1248 // count the protection domains on the execution stack. We collapse
1249 // duplicate consecutive protection domains into a single one, as
1250 // well as stopping when we hit a privileged frame.
1251
1252 oop previous_protection_domain = NULL;
1253 Handle privileged_context(thread, NULL);
1254 bool is_privileged = false;
1255 oop protection_domain = NULL;
1256
1257 // Iterate through Java frames
1258 vframeStream vfst(thread);
1259 for(; !vfst.at_end(); vfst.next()) {
1260 // get method of frame
1261 Method* method = vfst.method();
1262
1263 // stop at the first privileged frame
1264 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1265 method->name() == vmSymbols::executePrivileged_name())
1266 {
1267 // this frame is privileged
1268 is_privileged = true;
1269
1270 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1271
1272 StackValueCollection* locals = priv->locals();
1273 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1274 StackValue* clr_sv = locals->at(2); // Class<?> caller
1275 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1276 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1277 privileged_context = ctx_sv->get_obj();
1278 Handle caller = clr_sv->get_obj();
1279
1280 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1281 protection_domain = caller_klass->protection_domain();
1282 } else {
1283 protection_domain = method->method_holder()->protection_domain();
1284 }
1285
1286 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1287 local_array->push(protection_domain);
1288 previous_protection_domain = protection_domain;
1289 }
1290
1291 if (is_privileged) break;
1292 }
1293
1294
1295 // either all the domains on the stack were system domains, or
1296 // we had a privileged system domain
1297 if (local_array->is_empty()) {
1298 if (is_privileged && privileged_context.is_null()) return NULL;
1299
1300 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1301 return JNIHandles::make_local(env, result);
1302 }
1303
1304 // the resource area must be registered in case of a gc
1305 RegisterArrayForGC ragc(thread, local_array);
1306 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1307 local_array->length(), CHECK_NULL);
1308 objArrayHandle h_context(thread, context);
1309 for (int index = 0; index < local_array->length(); index++) {
1310 h_context->obj_at_put(index, local_array->at(index));
1311 }
1312
1313 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1314
1315 return JNIHandles::make_local(env, result);
1316 JVM_END
1317
1318
1319 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1320 JVMWrapper("JVM_IsArrayClass");
1321 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1322 return (k != NULL) && k->is_array_klass() ? true : false;
1323 JVM_END
1324
1325
1326 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1327 JVMWrapper("JVM_IsPrimitiveClass");
1328 oop mirror = JNIHandles::resolve_non_null(cls);
1329 return (jboolean) java_lang_Class::is_primitive(mirror);
1330 JVM_END
1331
1332
1333 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1334 JVMWrapper("JVM_GetClassModifiers");
1335 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1336 // Primitive type
1337 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1338 }
1339
1340 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1341 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1342 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1343 return k->modifier_flags();
1344 JVM_END
1345
1346
1347 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1348
1349 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1350 JvmtiVMObjectAllocEventCollector oam;
1351 // ofClass is a reference to a java_lang_Class object. The mirror object
1352 // of an InstanceKlass
1353
1354 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1355 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1356 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1357 return (jobjectArray)JNIHandles::make_local(env, result);
1358 }
1359
1360 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1361 InnerClassesIterator iter(k);
1362
1363 if (iter.length() == 0) {
1364 // Neither an inner nor outer class
1365 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1366 return (jobjectArray)JNIHandles::make_local(env, result);
1367 }
1368
1369 // find inner class info
1370 constantPoolHandle cp(thread, k->constants());
1371 int length = iter.length();
1372
1373 // Allocate temp. result array
1374 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1375 objArrayHandle result (THREAD, r);
1376 int members = 0;
1377
1378 for (; !iter.done(); iter.next()) {
1379 int ioff = iter.inner_class_info_index();
1380 int ooff = iter.outer_class_info_index();
1381
1382 if (ioff != 0 && ooff != 0) {
1383 // Check to see if the name matches the class we're looking for
1384 // before attempting to find the class.
1385 if (cp->klass_name_at_matches(k, ooff)) {
1386 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1387 if (outer_klass == k) {
1388 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1389 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1390
1391 // Throws an exception if outer klass has not declared k as
1392 // an inner klass
1393 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1394
1395 result->obj_at_put(members, inner_klass->java_mirror());
1396 members++;
1397 }
1398 }
1399 }
1400 }
1401
1402 if (members != length) {
1403 // Return array of right length
1404 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1405 for(int i = 0; i < members; i++) {
1406 res->obj_at_put(i, result->obj_at(i));
1407 }
1408 return (jobjectArray)JNIHandles::make_local(env, res);
1409 }
1410
1411 return (jobjectArray)JNIHandles::make_local(env, result());
1412 JVM_END
1413
1414
1415 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1416 {
1417 // ofClass is a reference to a java_lang_Class object.
1418 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1419 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1420 return NULL;
1421 }
1422
1423 bool inner_is_member = false;
1424 Klass* outer_klass
1425 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1426 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1427 if (outer_klass == NULL) return NULL; // already a top-level class
1428 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1429 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1430 }
1431 JVM_END
1432
1433 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1434 {
1435 oop mirror = JNIHandles::resolve_non_null(cls);
1436 if (java_lang_Class::is_primitive(mirror) ||
1437 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1438 return NULL;
1439 }
1440 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1441 int ooff = 0, noff = 0;
1442 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1443 if (noff != 0) {
1444 constantPoolHandle i_cp(thread, k->constants());
1445 Symbol* name = i_cp->symbol_at(noff);
1446 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1447 return (jstring) JNIHandles::make_local(env, str());
1448 }
1449 }
1450 return NULL;
1451 }
1452 JVM_END
1453
1454 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1455 assert (cls != NULL, "illegal class");
1456 JVMWrapper("JVM_GetClassSignature");
1457 JvmtiVMObjectAllocEventCollector oam;
1458 ResourceMark rm(THREAD);
1459 // Return null for arrays and primatives
1460 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1461 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1462 if (k->is_instance_klass()) {
1463 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1464 if (sym == NULL) return NULL;
1465 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1466 return (jstring) JNIHandles::make_local(env, str());
1467 }
1468 }
1469 return NULL;
1470 JVM_END
1471
1472
1473 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1474 assert (cls != NULL, "illegal class");
1475 JVMWrapper("JVM_GetClassAnnotations");
1476
1477 // Return null for arrays and primitives
1478 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1479 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1480 if (k->is_instance_klass()) {
1481 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1482 return (jbyteArray) JNIHandles::make_local(env, a);
1483 }
1484 }
1485 return NULL;
1486 JVM_END
1487
1488
1489 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1490 // some of this code was adapted from from jni_FromReflectedField
1491
1492 oop reflected = JNIHandles::resolve_non_null(field);
1493 oop mirror = java_lang_reflect_Field::clazz(reflected);
1494 Klass* k = java_lang_Class::as_Klass(mirror);
1495 int slot = java_lang_reflect_Field::slot(reflected);
1496 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1497
1498 InstanceKlass* ik = InstanceKlass::cast(k);
1499 intptr_t offset = ik->field_offset(slot);
1500
1501 if (modifiers & JVM_ACC_STATIC) {
1502 // for static fields we only look in the current class
1503 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1504 assert(false, "cannot find static field");
1505 return false;
1506 }
1507 } else {
1508 // for instance fields we start with the current class and work
1509 // our way up through the superclass chain
1510 if (!ik->find_field_from_offset(offset, false, &fd)) {
1511 assert(false, "cannot find instance field");
1512 return false;
1513 }
1514 }
1515 return true;
1516 }
1517
1518 static Method* jvm_get_method_common(jobject method) {
1519 // some of this code was adapted from from jni_FromReflectedMethod
1520
1521 oop reflected = JNIHandles::resolve_non_null(method);
1522 oop mirror = NULL;
1523 int slot = 0;
1524
1525 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1526 mirror = java_lang_reflect_Constructor::clazz(reflected);
1527 slot = java_lang_reflect_Constructor::slot(reflected);
1528 } else {
1529 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1530 "wrong type");
1531 mirror = java_lang_reflect_Method::clazz(reflected);
1532 slot = java_lang_reflect_Method::slot(reflected);
1533 }
1534 Klass* k = java_lang_Class::as_Klass(mirror);
1535
1536 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1537 assert(m != NULL, "cannot find method");
1538 return m; // caller has to deal with NULL in product mode
1539 }
1540
1541 /* Type use annotations support (JDK 1.8) */
1542
1543 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1544 assert (cls != NULL, "illegal class");
1545 JVMWrapper("JVM_GetClassTypeAnnotations");
1546 ResourceMark rm(THREAD);
1547 // Return null for arrays and primitives
1548 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1549 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1550 if (k->is_instance_klass()) {
1551 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1552 if (type_annotations != NULL) {
1553 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1554 return (jbyteArray) JNIHandles::make_local(env, a);
1555 }
1556 }
1557 }
1558 return NULL;
1559 JVM_END
1560
1561 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1562 assert (method != NULL, "illegal method");
1563 JVMWrapper("JVM_GetMethodTypeAnnotations");
1564
1565 // method is a handle to a java.lang.reflect.Method object
1566 Method* m = jvm_get_method_common(method);
1567 if (m == NULL) {
1568 return NULL;
1569 }
1570
1571 AnnotationArray* type_annotations = m->type_annotations();
1572 if (type_annotations != NULL) {
1573 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1574 return (jbyteArray) JNIHandles::make_local(env, a);
1575 }
1576
1577 return NULL;
1578 JVM_END
1579
1580 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1581 assert (field != NULL, "illegal field");
1582 JVMWrapper("JVM_GetFieldTypeAnnotations");
1583
1584 fieldDescriptor fd;
1585 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1586 if (!gotFd) {
1587 return NULL;
1588 }
1589
1590 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1591 JVM_END
1592
1593 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1594 if (!cp->is_within_bounds(index)) {
1595 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1596 }
1597 }
1598
1599 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1600 {
1601 JVMWrapper("JVM_GetMethodParameters");
1602 // method is a handle to a java.lang.reflect.Method object
1603 Method* method_ptr = jvm_get_method_common(method);
1604 methodHandle mh (THREAD, method_ptr);
1605 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1606 const int num_params = mh->method_parameters_length();
1607
1608 if (num_params < 0) {
1609 // A -1 return value from method_parameters_length means there is no
1610 // parameter data. Return null to indicate this to the reflection
1611 // API.
1612 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1613 return (jobjectArray)NULL;
1614 } else {
1615 // Otherwise, we return something up to reflection, even if it is
1616 // a zero-length array. Why? Because in some cases this can
1617 // trigger a MalformedParametersException.
1618
1619 // make sure all the symbols are properly formatted
1620 for (int i = 0; i < num_params; i++) {
1621 MethodParametersElement* params = mh->method_parameters_start();
1622 int index = params[i].name_cp_index;
1623 constantPoolHandle cp(THREAD, mh->constants());
1624 bounds_check(cp, index, CHECK_NULL);
1625
1626 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1627 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1628 "Wrong type at constant pool index");
1629 }
1630
1631 }
1632
1633 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1634 objArrayHandle result (THREAD, result_oop);
1635
1636 for (int i = 0; i < num_params; i++) {
1637 MethodParametersElement* params = mh->method_parameters_start();
1638 // For a 0 index, give a NULL symbol
1639 Symbol* sym = 0 != params[i].name_cp_index ?
1640 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1641 int flags = params[i].flags;
1642 oop param = Reflection::new_parameter(reflected_method, i, sym,
1643 flags, CHECK_NULL);
1644 result->obj_at_put(i, param);
1645 }
1646 return (jobjectArray)JNIHandles::make_local(env, result());
1647 }
1648 }
1649 JVM_END
1650
1651 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1652
1653 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1654 {
1655 JVMWrapper("JVM_GetClassDeclaredFields");
1656 JvmtiVMObjectAllocEventCollector oam;
1657
1658 // Exclude primitive types and array types
1659 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1660 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1661 // Return empty array
1662 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1663 return (jobjectArray) JNIHandles::make_local(env, res);
1664 }
1665
1666 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1667 constantPoolHandle cp(THREAD, k->constants());
1668
1669 // Ensure class is linked
1670 k->link_class(CHECK_NULL);
1671
1672 // Allocate result
1673 int num_fields;
1674
1675 if (publicOnly) {
1676 num_fields = 0;
1677 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1678 if (fs.access_flags().is_public()) ++num_fields;
1679 }
1680 } else {
1681 num_fields = k->java_fields_count();
1682 }
1683
1684 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1685 objArrayHandle result (THREAD, r);
1686
1687 int out_idx = 0;
1688 fieldDescriptor fd;
1689 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1690 if (!publicOnly || fs.access_flags().is_public()) {
1691 fd.reinitialize(k, fs.index());
1692 oop field = Reflection::new_field(&fd, CHECK_NULL);
1693 result->obj_at_put(out_idx, field);
1694 ++out_idx;
1695 }
1696 }
1697 assert(out_idx == num_fields, "just checking");
1698 return (jobjectArray) JNIHandles::make_local(env, result());
1699 }
1700 JVM_END
1701
1702 static bool select_method(const methodHandle& method, bool want_constructor) {
1703 if (want_constructor) {
1704 return (method->is_initializer() && !method->is_static());
1705 } else {
1706 return (!method->is_initializer() && !method->is_overpass());
1707 }
1708 }
1709
1710 static jobjectArray get_class_declared_methods_helper(
1711 JNIEnv *env,
1712 jclass ofClass, jboolean publicOnly,
1713 bool want_constructor,
1714 Klass* klass, TRAPS) {
1715
1716 JvmtiVMObjectAllocEventCollector oam;
1717
1718 // Exclude primitive types and array types
1719 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1720 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1721 // Return empty array
1722 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1723 return (jobjectArray) JNIHandles::make_local(env, res);
1724 }
1725
1726 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1727
1728 // Ensure class is linked
1729 k->link_class(CHECK_NULL);
1730
1731 Array<Method*>* methods = k->methods();
1732 int methods_length = methods->length();
1733
1734 // Save original method_idnum in case of redefinition, which can change
1735 // the idnum of obsolete methods. The new method will have the same idnum
1736 // but if we refresh the methods array, the counts will be wrong.
1737 ResourceMark rm(THREAD);
1738 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1739 int num_methods = 0;
1740
1741 for (int i = 0; i < methods_length; i++) {
1742 methodHandle method(THREAD, methods->at(i));
1743 if (select_method(method, want_constructor)) {
1744 if (!publicOnly || method->is_public()) {
1745 idnums->push(method->method_idnum());
1746 ++num_methods;
1747 }
1748 }
1749 }
1750
1751 // Allocate result
1752 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1753 objArrayHandle result (THREAD, r);
1754
1755 // Now just put the methods that we selected above, but go by their idnum
1756 // in case of redefinition. The methods can be redefined at any safepoint,
1757 // so above when allocating the oop array and below when creating reflect
1758 // objects.
1759 for (int i = 0; i < num_methods; i++) {
1760 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1761 if (method.is_null()) {
1762 // Method may have been deleted and seems this API can handle null
1763 // Otherwise should probably put a method that throws NSME
1764 result->obj_at_put(i, NULL);
1765 } else {
1766 oop m;
1767 if (want_constructor) {
1768 m = Reflection::new_constructor(method, CHECK_NULL);
1769 } else {
1770 m = Reflection::new_method(method, false, CHECK_NULL);
1771 }
1772 result->obj_at_put(i, m);
1773 }
1774 }
1775
1776 return (jobjectArray) JNIHandles::make_local(env, result());
1777 }
1778
1779 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1780 {
1781 JVMWrapper("JVM_GetClassDeclaredMethods");
1782 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1783 /*want_constructor*/ false,
1784 SystemDictionary::reflect_Method_klass(), THREAD);
1785 }
1786 JVM_END
1787
1788 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1789 {
1790 JVMWrapper("JVM_GetClassDeclaredConstructors");
1791 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1792 /*want_constructor*/ true,
1793 SystemDictionary::reflect_Constructor_klass(), THREAD);
1794 }
1795 JVM_END
1796
1797 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1798 {
1799 JVMWrapper("JVM_GetClassAccessFlags");
1800 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1801 // Primitive type
1802 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1803 }
1804
1805 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1806 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1807 }
1808 JVM_END
1809
1810 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1811 {
1812 JVMWrapper("JVM_AreNestMates");
1813 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1814 assert(c->is_instance_klass(), "must be");
1815 InstanceKlass* ck = InstanceKlass::cast(c);
1816 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1817 assert(m->is_instance_klass(), "must be");
1818 InstanceKlass* mk = InstanceKlass::cast(m);
1819 return ck->has_nestmate_access_to(mk, THREAD);
1820 }
1821 JVM_END
1822
1823 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1824 {
1825 // current is not a primitive or array class
1826 JVMWrapper("JVM_GetNestHost");
1827 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1828 assert(c->is_instance_klass(), "must be");
1829 InstanceKlass* ck = InstanceKlass::cast(c);
1830 // Don't post exceptions if validation fails
1831 InstanceKlass* host = ck->nest_host(NULL, THREAD);
1832 return (jclass) (host == NULL ? NULL :
1833 JNIHandles::make_local(THREAD, host->java_mirror()));
1834 }
1835 JVM_END
1836
1837 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1838 {
1839 // current is not a primitive or array class
1840 JVMWrapper("JVM_GetNestMembers");
1841 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1842 assert(c->is_instance_klass(), "must be");
1843 InstanceKlass* ck = InstanceKlass::cast(c);
1844 // Get the nest host for this nest - throw ICCE if validation fails
1845 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
1846 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
1847
1848 {
1849 JvmtiVMObjectAllocEventCollector oam;
1850 Array<u2>* members = host->nest_members();
1851 int length = members == NULL ? 0 : members->length();
1852 // nest host is first in the array so make it one bigger
1853 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
1854 length + 1, CHECK_NULL);
1855 objArrayHandle result (THREAD, r);
1856 result->obj_at_put(0, host->java_mirror());
1857 if (length != 0) {
1858 int i;
1859 for (i = 0; i < length; i++) {
1860 int cp_index = members->at(i);
1861 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
1862 if (k->is_instance_klass()) {
1863 InstanceKlass* nest_host_k =
1864 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
1865 if (nest_host_k == host) {
1866 result->obj_at_put(i+1, k->java_mirror());
1867 }
1868 else {
1869 // k's nest host is legal but it isn't our host so
1870 // throw ICCE
1871 ResourceMark rm(THREAD);
1872 Exceptions::fthrow(THREAD_AND_LOCATION,
1873 icce,
1874 "Nest member %s in %s declares a different nest host of %s",
1875 k->external_name(),
1876 host->external_name(),
1877 nest_host_k->external_name()
1878 );
1879 return NULL;
1880 }
1881 }
1882 else {
1883 // we have a bad nest member entry - throw ICCE
1884 ResourceMark rm(THREAD);
1885 Exceptions::fthrow(THREAD_AND_LOCATION,
1886 icce,
1887 "Class %s can not be a nest member of %s",
1888 k->external_name(),
1889 host->external_name()
1890 );
1891 return NULL;
1892 }
1893 }
1894 }
1895 else {
1896 assert(host == ck, "must be singleton nest");
1897 }
1898 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1899 }
1900 }
1901 JVM_END
1902
1903 // Constant pool access //////////////////////////////////////////////////////////
1904
1905 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1906 {
1907 JVMWrapper("JVM_GetClassConstantPool");
1908 JvmtiVMObjectAllocEventCollector oam;
1909
1910 // Return null for primitives and arrays
1911 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1912 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1913 if (k->is_instance_klass()) {
1914 InstanceKlass* k_h = InstanceKlass::cast(k);
1915 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1916 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1917 return JNIHandles::make_local(jcp());
1918 }
1919 }
1920 return NULL;
1921 }
1922 JVM_END
1923
1924
1925 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1926 {
1927 JVMWrapper("JVM_ConstantPoolGetSize");
1928 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1929 return cp->length();
1930 }
1931 JVM_END
1932
1933
1934 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1935 {
1936 JVMWrapper("JVM_ConstantPoolGetClassAt");
1937 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1938 bounds_check(cp, index, CHECK_NULL);
1939 constantTag tag = cp->tag_at(index);
1940 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1941 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1942 }
1943 Klass* k = cp->klass_at(index, CHECK_NULL);
1944 return (jclass) JNIHandles::make_local(k->java_mirror());
1945 }
1946 JVM_END
1947
1948 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1949 {
1950 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1951 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1952 bounds_check(cp, index, CHECK_NULL);
1953 constantTag tag = cp->tag_at(index);
1954 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1955 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1956 }
1957 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1958 if (k == NULL) return NULL;
1959 return (jclass) JNIHandles::make_local(k->java_mirror());
1960 }
1961 JVM_END
1962
1963 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1964 constantTag tag = cp->tag_at(index);
1965 if (!tag.is_method() && !tag.is_interface_method()) {
1966 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1967 }
1968 int klass_ref = cp->uncached_klass_ref_index_at(index);
1969 Klass* k_o;
1970 if (force_resolution) {
1971 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1972 } else {
1973 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1974 if (k_o == NULL) return NULL;
1975 }
1976 InstanceKlass* k = InstanceKlass::cast(k_o);
1977 Symbol* name = cp->uncached_name_ref_at(index);
1978 Symbol* sig = cp->uncached_signature_ref_at(index);
1979 methodHandle m (THREAD, k->find_method(name, sig));
1980 if (m.is_null()) {
1981 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1982 }
1983 oop method;
1984 if (!m->is_initializer() || m->is_static()) {
1985 method = Reflection::new_method(m, true, CHECK_NULL);
1986 } else {
1987 method = Reflection::new_constructor(m, CHECK_NULL);
1988 }
1989 return JNIHandles::make_local(method);
1990 }
1991
1992 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1993 {
1994 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1995 JvmtiVMObjectAllocEventCollector oam;
1996 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1997 bounds_check(cp, index, CHECK_NULL);
1998 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1999 return res;
2000 }
2001 JVM_END
2002
2003 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2004 {
2005 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2006 JvmtiVMObjectAllocEventCollector oam;
2007 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2008 bounds_check(cp, index, CHECK_NULL);
2009 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2010 return res;
2011 }
2012 JVM_END
2013
2014 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2015 constantTag tag = cp->tag_at(index);
2016 if (!tag.is_field()) {
2017 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2018 }
2019 int klass_ref = cp->uncached_klass_ref_index_at(index);
2020 Klass* k_o;
2021 if (force_resolution) {
2022 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2023 } else {
2024 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2025 if (k_o == NULL) return NULL;
2026 }
2027 InstanceKlass* k = InstanceKlass::cast(k_o);
2028 Symbol* name = cp->uncached_name_ref_at(index);
2029 Symbol* sig = cp->uncached_signature_ref_at(index);
2030 fieldDescriptor fd;
2031 Klass* target_klass = k->find_field(name, sig, &fd);
2032 if (target_klass == NULL) {
2033 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2034 }
2035 oop field = Reflection::new_field(&fd, CHECK_NULL);
2036 return JNIHandles::make_local(field);
2037 }
2038
2039 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2040 {
2041 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2042 JvmtiVMObjectAllocEventCollector oam;
2043 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2044 bounds_check(cp, index, CHECK_NULL);
2045 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2046 return res;
2047 }
2048 JVM_END
2049
2050 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2051 {
2052 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2053 JvmtiVMObjectAllocEventCollector oam;
2054 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2055 bounds_check(cp, index, CHECK_NULL);
2056 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2057 return res;
2058 }
2059 JVM_END
2060
2061 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2062 {
2063 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2064 JvmtiVMObjectAllocEventCollector oam;
2065 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2066 bounds_check(cp, index, CHECK_NULL);
2067 constantTag tag = cp->tag_at(index);
2068 if (!tag.is_field_or_method()) {
2069 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2070 }
2071 int klass_ref = cp->uncached_klass_ref_index_at(index);
2072 Symbol* klass_name = cp->klass_name_at(klass_ref);
2073 Symbol* member_name = cp->uncached_name_ref_at(index);
2074 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2075 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2076 objArrayHandle dest(THREAD, dest_o);
2077 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2078 dest->obj_at_put(0, str());
2079 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2080 dest->obj_at_put(1, str());
2081 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2082 dest->obj_at_put(2, str());
2083 return (jobjectArray) JNIHandles::make_local(dest());
2084 }
2085 JVM_END
2086
2087 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2088 {
2089 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2090 JvmtiVMObjectAllocEventCollector oam;
2091 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2092 bounds_check(cp, index, CHECK_0);
2093 constantTag tag = cp->tag_at(index);
2094 if (!tag.is_field_or_method()) {
2095 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2096 }
2097 return (jint) cp->uncached_klass_ref_index_at(index);
2098 }
2099 JVM_END
2100
2101 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2102 {
2103 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2104 JvmtiVMObjectAllocEventCollector oam;
2105 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2106 bounds_check(cp, index, CHECK_0);
2107 constantTag tag = cp->tag_at(index);
2108 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2109 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2110 }
2111 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2112 }
2113 JVM_END
2114
2115 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2116 {
2117 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2118 JvmtiVMObjectAllocEventCollector oam;
2119 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2120 bounds_check(cp, index, CHECK_NULL);
2121 constantTag tag = cp->tag_at(index);
2122 if (!tag.is_name_and_type()) {
2123 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2124 }
2125 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2126 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2127 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2128 objArrayHandle dest(THREAD, dest_o);
2129 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2130 dest->obj_at_put(0, str());
2131 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2132 dest->obj_at_put(1, str());
2133 return (jobjectArray) JNIHandles::make_local(dest());
2134 }
2135 JVM_END
2136
2137 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2138 {
2139 JVMWrapper("JVM_ConstantPoolGetIntAt");
2140 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2141 bounds_check(cp, index, CHECK_0);
2142 constantTag tag = cp->tag_at(index);
2143 if (!tag.is_int()) {
2144 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2145 }
2146 return cp->int_at(index);
2147 }
2148 JVM_END
2149
2150 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2151 {
2152 JVMWrapper("JVM_ConstantPoolGetLongAt");
2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2154 bounds_check(cp, index, CHECK_(0L));
2155 constantTag tag = cp->tag_at(index);
2156 if (!tag.is_long()) {
2157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2158 }
2159 return cp->long_at(index);
2160 }
2161 JVM_END
2162
2163 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2164 {
2165 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2166 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2167 bounds_check(cp, index, CHECK_(0.0f));
2168 constantTag tag = cp->tag_at(index);
2169 if (!tag.is_float()) {
2170 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2171 }
2172 return cp->float_at(index);
2173 }
2174 JVM_END
2175
2176 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2177 {
2178 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2179 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2180 bounds_check(cp, index, CHECK_(0.0));
2181 constantTag tag = cp->tag_at(index);
2182 if (!tag.is_double()) {
2183 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2184 }
2185 return cp->double_at(index);
2186 }
2187 JVM_END
2188
2189 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2190 {
2191 JVMWrapper("JVM_ConstantPoolGetStringAt");
2192 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2193 bounds_check(cp, index, CHECK_NULL);
2194 constantTag tag = cp->tag_at(index);
2195 if (!tag.is_string()) {
2196 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2197 }
2198 oop str = cp->string_at(index, CHECK_NULL);
2199 return (jstring) JNIHandles::make_local(str);
2200 }
2201 JVM_END
2202
2203 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2204 {
2205 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2206 JvmtiVMObjectAllocEventCollector oam;
2207 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2208 bounds_check(cp, index, CHECK_NULL);
2209 constantTag tag = cp->tag_at(index);
2210 if (!tag.is_symbol()) {
2211 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2212 }
2213 Symbol* sym = cp->symbol_at(index);
2214 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2215 return (jstring) JNIHandles::make_local(str());
2216 }
2217 JVM_END
2218
2219 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2220 {
2221 JVMWrapper("JVM_ConstantPoolGetTagAt");
2222 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2223 bounds_check(cp, index, CHECK_0);
2224 constantTag tag = cp->tag_at(index);
2225 jbyte result = tag.value();
2226 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2227 // they are changed to the corresponding tags from the JVM spec, so that java code in
2228 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2229 if (tag.is_klass_or_reference()) {
2230 result = JVM_CONSTANT_Class;
2231 } else if (tag.is_string_index()) {
2232 result = JVM_CONSTANT_String;
2233 } else if (tag.is_method_type_in_error()) {
2234 result = JVM_CONSTANT_MethodType;
2235 } else if (tag.is_method_handle_in_error()) {
2236 result = JVM_CONSTANT_MethodHandle;
2237 } else if (tag.is_dynamic_constant_in_error()) {
2238 result = JVM_CONSTANT_Dynamic;
2239 }
2240 return result;
2241 }
2242 JVM_END
2243
2244 // Assertion support. //////////////////////////////////////////////////////////
2245
2246 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2247 JVMWrapper("JVM_DesiredAssertionStatus");
2248 assert(cls != NULL, "bad class");
2249
2250 oop r = JNIHandles::resolve(cls);
2251 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2252 if (java_lang_Class::is_primitive(r)) return false;
2253
2254 Klass* k = java_lang_Class::as_Klass(r);
2255 assert(k->is_instance_klass(), "must be an instance klass");
2256 if (!k->is_instance_klass()) return false;
2257
2258 ResourceMark rm(THREAD);
2259 const char* name = k->name()->as_C_string();
2260 bool system_class = k->class_loader() == NULL;
2261 return JavaAssertions::enabled(name, system_class);
2262
2263 JVM_END
2264
2265
2266 // Return a new AssertionStatusDirectives object with the fields filled in with
2267 // command-line assertion arguments (i.e., -ea, -da).
2268 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2269 JVMWrapper("JVM_AssertionStatusDirectives");
2270 JvmtiVMObjectAllocEventCollector oam;
2271 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2272 return JNIHandles::make_local(env, asd);
2273 JVM_END
2274
2275 // Verification ////////////////////////////////////////////////////////////////////////////////
2276
2277 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2278
2279 // RedefineClasses support: bug 6214132 caused verification to fail.
2280 // All functions from this section should call the jvmtiThreadSate function:
2281 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2282 // The function returns a Klass* of the _scratch_class if the verifier
2283 // was invoked in the middle of the class redefinition.
2284 // Otherwise it returns its argument value which is the _the_class Klass*.
2285 // Please, refer to the description in the jvmtiThreadSate.hpp.
2286
2287 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2288 JVMWrapper("JVM_GetClassNameUTF");
2289 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2290 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2291 return k->name()->as_utf8();
2292 JVM_END
2293
2294
2295 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2296 JVMWrapper("JVM_GetClassCPTypes");
2297 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2298 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2299 // types will have length zero if this is not an InstanceKlass
2300 // (length is determined by call to JVM_GetClassCPEntriesCount)
2301 if (k->is_instance_klass()) {
2302 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2303 for (int index = cp->length() - 1; index >= 0; index--) {
2304 constantTag tag = cp->tag_at(index);
2305 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2306 }
2307 }
2308 JVM_END
2309
2310
2311 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2312 JVMWrapper("JVM_GetClassCPEntriesCount");
2313 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2314 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2315 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2316 JVM_END
2317
2318
2319 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2320 JVMWrapper("JVM_GetClassFieldsCount");
2321 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2322 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2323 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2324 JVM_END
2325
2326
2327 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2328 JVMWrapper("JVM_GetClassMethodsCount");
2329 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2330 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2331 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2332 JVM_END
2333
2334
2335 // The following methods, used for the verifier, are never called with
2336 // array klasses, so a direct cast to InstanceKlass is safe.
2337 // Typically, these methods are called in a loop with bounds determined
2338 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2339 // zero for arrays.
2340 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2341 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2342 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2343 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2344 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2345 int length = method->checked_exceptions_length();
2346 if (length > 0) {
2347 CheckedExceptionElement* table= method->checked_exceptions_start();
2348 for (int i = 0; i < length; i++) {
2349 exceptions[i] = table[i].class_cp_index;
2350 }
2351 }
2352 JVM_END
2353
2354
2355 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2356 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2357 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2358 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2359 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2360 return method->checked_exceptions_length();
2361 JVM_END
2362
2363
2364 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2365 JVMWrapper("JVM_GetMethodIxByteCode");
2366 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2367 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2368 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2369 memcpy(code, method->code_base(), method->code_size());
2370 JVM_END
2371
2372
2373 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2374 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2375 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2376 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2377 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2378 return method->code_size();
2379 JVM_END
2380
2381
2382 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2383 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2384 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2385 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2386 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2387 ExceptionTable extable(method);
2388 entry->start_pc = extable.start_pc(entry_index);
2389 entry->end_pc = extable.end_pc(entry_index);
2390 entry->handler_pc = extable.handler_pc(entry_index);
2391 entry->catchType = extable.catch_type_index(entry_index);
2392 JVM_END
2393
2394
2395 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2396 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2397 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2398 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2399 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2400 return method->exception_table_length();
2401 JVM_END
2402
2403
2404 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2405 JVMWrapper("JVM_GetMethodIxModifiers");
2406 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2407 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2408 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2409 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2410 JVM_END
2411
2412
2413 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2414 JVMWrapper("JVM_GetFieldIxModifiers");
2415 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2416 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2417 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2418 JVM_END
2419
2420
2421 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2422 JVMWrapper("JVM_GetMethodIxLocalsCount");
2423 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2424 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2425 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2426 return method->max_locals();
2427 JVM_END
2428
2429
2430 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2431 JVMWrapper("JVM_GetMethodIxArgsSize");
2432 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2433 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2434 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2435 return method->size_of_parameters();
2436 JVM_END
2437
2438
2439 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2440 JVMWrapper("JVM_GetMethodIxMaxStack");
2441 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2442 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2443 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2444 return method->verifier_max_stack();
2445 JVM_END
2446
2447
2448 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2449 JVMWrapper("JVM_IsConstructorIx");
2450 ResourceMark rm(THREAD);
2451 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2452 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2453 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2454 return method->name() == vmSymbols::object_initializer_name();
2455 JVM_END
2456
2457
2458 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2459 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2460 ResourceMark rm(THREAD);
2461 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2462 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2463 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2464 return method->is_overpass();
2465 JVM_END
2466
2467 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2468 JVMWrapper("JVM_GetMethodIxIxUTF");
2469 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2470 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2471 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2472 return method->name()->as_utf8();
2473 JVM_END
2474
2475
2476 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2477 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2478 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2479 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2480 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2481 return method->signature()->as_utf8();
2482 JVM_END
2483
2484 /**
2485 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2486 * read entries in the constant pool. Since the old verifier always
2487 * works on a copy of the code, it will not see any rewriting that
2488 * may possibly occur in the middle of verification. So it is important
2489 * that nothing it calls tries to use the cpCache instead of the raw
2490 * constant pool, so we must use cp->uncached_x methods when appropriate.
2491 */
2492 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2493 JVMWrapper("JVM_GetCPFieldNameUTF");
2494 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2495 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2496 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2497 switch (cp->tag_at(cp_index).value()) {
2498 case JVM_CONSTANT_Fieldref:
2499 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2500 default:
2501 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2502 }
2503 ShouldNotReachHere();
2504 return NULL;
2505 JVM_END
2506
2507
2508 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2509 JVMWrapper("JVM_GetCPMethodNameUTF");
2510 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2511 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2512 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2513 switch (cp->tag_at(cp_index).value()) {
2514 case JVM_CONSTANT_InterfaceMethodref:
2515 case JVM_CONSTANT_Methodref:
2516 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2517 default:
2518 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2519 }
2520 ShouldNotReachHere();
2521 return NULL;
2522 JVM_END
2523
2524
2525 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2526 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2527 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2528 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2529 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2530 switch (cp->tag_at(cp_index).value()) {
2531 case JVM_CONSTANT_InterfaceMethodref:
2532 case JVM_CONSTANT_Methodref:
2533 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2534 default:
2535 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2536 }
2537 ShouldNotReachHere();
2538 return NULL;
2539 JVM_END
2540
2541
2542 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2543 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2544 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2545 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2546 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2547 switch (cp->tag_at(cp_index).value()) {
2548 case JVM_CONSTANT_Fieldref:
2549 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2550 default:
2551 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2552 }
2553 ShouldNotReachHere();
2554 return NULL;
2555 JVM_END
2556
2557
2558 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2559 JVMWrapper("JVM_GetCPClassNameUTF");
2560 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2561 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2562 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2563 Symbol* classname = cp->klass_name_at(cp_index);
2564 return classname->as_utf8();
2565 JVM_END
2566
2567
2568 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2569 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2570 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2571 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2572 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2573 switch (cp->tag_at(cp_index).value()) {
2574 case JVM_CONSTANT_Fieldref: {
2575 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2576 Symbol* classname = cp->klass_name_at(class_index);
2577 return classname->as_utf8();
2578 }
2579 default:
2580 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2581 }
2582 ShouldNotReachHere();
2583 return NULL;
2584 JVM_END
2585
2586
2587 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2588 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2589 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2590 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2591 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2592 switch (cp->tag_at(cp_index).value()) {
2593 case JVM_CONSTANT_Methodref:
2594 case JVM_CONSTANT_InterfaceMethodref: {
2595 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2596 Symbol* classname = cp->klass_name_at(class_index);
2597 return classname->as_utf8();
2598 }
2599 default:
2600 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2601 }
2602 ShouldNotReachHere();
2603 return NULL;
2604 JVM_END
2605
2606
2607 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2608 JVMWrapper("JVM_GetCPFieldModifiers");
2609 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2610 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2611 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2612 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2613 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2614 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2615 switch (cp->tag_at(cp_index).value()) {
2616 case JVM_CONSTANT_Fieldref: {
2617 Symbol* name = cp->uncached_name_ref_at(cp_index);
2618 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2619 InstanceKlass* ik = InstanceKlass::cast(k_called);
2620 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2621 if (fs.name() == name && fs.signature() == signature) {
2622 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2623 }
2624 }
2625 return -1;
2626 }
2627 default:
2628 fatal("JVM_GetCPFieldModifiers: illegal constant");
2629 }
2630 ShouldNotReachHere();
2631 return 0;
2632 JVM_END
2633
2634
2635 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2636 JVMWrapper("JVM_GetCPMethodModifiers");
2637 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2638 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2639 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2640 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2641 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2642 switch (cp->tag_at(cp_index).value()) {
2643 case JVM_CONSTANT_Methodref:
2644 case JVM_CONSTANT_InterfaceMethodref: {
2645 Symbol* name = cp->uncached_name_ref_at(cp_index);
2646 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2647 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2648 int methods_count = methods->length();
2649 for (int i = 0; i < methods_count; i++) {
2650 Method* method = methods->at(i);
2651 if (method->name() == name && method->signature() == signature) {
2652 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2653 }
2654 }
2655 return -1;
2656 }
2657 default:
2658 fatal("JVM_GetCPMethodModifiers: illegal constant");
2659 }
2660 ShouldNotReachHere();
2661 return 0;
2662 JVM_END
2663
2664
2665 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2666
2667 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2668 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2669 JVM_END
2670
2671
2672 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2673 JVMWrapper("JVM_IsSameClassPackage");
2674 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2675 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2676 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2677 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2678 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2679 JVM_END
2680
2681 // Printing support //////////////////////////////////////////////////
2682 extern "C" {
2683
2684 ATTRIBUTE_PRINTF(3, 0)
2685 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2686 // Reject count values that are negative signed values converted to
2687 // unsigned; see bug 4399518, 4417214
2688 if ((intptr_t)count <= 0) return -1;
2689
2690 int result = os::vsnprintf(str, count, fmt, args);
2691 if (result > 0 && (size_t)result >= count) {
2692 result = -1;
2693 }
2694
2695 return result;
2696 }
2697
2698 ATTRIBUTE_PRINTF(3, 4)
2699 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2700 va_list args;
2701 int len;
2702 va_start(args, fmt);
2703 len = jio_vsnprintf(str, count, fmt, args);
2704 va_end(args);
2705 return len;
2706 }
2707
2708 ATTRIBUTE_PRINTF(2, 3)
2709 int jio_fprintf(FILE* f, const char *fmt, ...) {
2710 int len;
2711 va_list args;
2712 va_start(args, fmt);
2713 len = jio_vfprintf(f, fmt, args);
2714 va_end(args);
2715 return len;
2716 }
2717
2718 ATTRIBUTE_PRINTF(2, 0)
2719 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2720 if (Arguments::vfprintf_hook() != NULL) {
2721 return Arguments::vfprintf_hook()(f, fmt, args);
2722 } else {
2723 return vfprintf(f, fmt, args);
2724 }
2725 }
2726
2727 ATTRIBUTE_PRINTF(1, 2)
2728 JNIEXPORT int jio_printf(const char *fmt, ...) {
2729 int len;
2730 va_list args;
2731 va_start(args, fmt);
2732 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2733 va_end(args);
2734 return len;
2735 }
2736
2737 // HotSpot specific jio method
2738 void jio_print(const char* s, size_t len) {
2739 // Try to make this function as atomic as possible.
2740 if (Arguments::vfprintf_hook() != NULL) {
2741 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2742 } else {
2743 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2744 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2745 }
2746 }
2747
2748 } // Extern C
2749
2750 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2751
2752 // In most of the JVM thread support functions we need to access the
2753 // thread through a ThreadsListHandle to prevent it from exiting and
2754 // being reclaimed while we try to operate on it. The exceptions to this
2755 // rule are when operating on the current thread, or if the monitor of
2756 // the target java.lang.Thread is locked at the Java level - in both
2757 // cases the target cannot exit.
2758
2759 static void thread_entry(JavaThread* thread, TRAPS) {
2760 HandleMark hm(THREAD);
2761 Handle obj(THREAD, thread->threadObj());
2762 JavaValue result(T_VOID);
2763 JavaCalls::call_virtual(&result,
2764 obj,
2765 SystemDictionary::Thread_klass(),
2766 vmSymbols::run_method_name(),
2767 vmSymbols::void_method_signature(),
2768 THREAD);
2769 }
2770
2771
2772 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2773 JVMWrapper("JVM_StartThread");
2774 JavaThread *native_thread = NULL;
2775
2776 // We cannot hold the Threads_lock when we throw an exception,
2777 // due to rank ordering issues. Example: we might need to grab the
2778 // Heap_lock while we construct the exception.
2779 bool throw_illegal_thread_state = false;
2780
2781 // We must release the Threads_lock before we can post a jvmti event
2782 // in Thread::start.
2783 {
2784 // Ensure that the C++ Thread and OSThread structures aren't freed before
2785 // we operate.
2786 MutexLocker mu(Threads_lock);
2787
2788 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2789 // re-starting an already started thread, so we should usually find
2790 // that the JavaThread is null. However for a JNI attached thread
2791 // there is a small window between the Thread object being created
2792 // (with its JavaThread set) and the update to its threadStatus, so we
2793 // have to check for this
2794 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2795 throw_illegal_thread_state = true;
2796 } else {
2797 // We could also check the stillborn flag to see if this thread was already stopped, but
2798 // for historical reasons we let the thread detect that itself when it starts running
2799
2800 jlong size =
2801 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2802 // Allocate the C++ Thread structure and create the native thread. The
2803 // stack size retrieved from java is 64-bit signed, but the constructor takes
2804 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2805 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2806 // - Avoid passing negative values which would result in really large stacks.
2807 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2808 size_t sz = size > 0 ? (size_t) size : 0;
2809 native_thread = new JavaThread(&thread_entry, sz);
2810
2811 // At this point it may be possible that no osthread was created for the
2812 // JavaThread due to lack of memory. Check for this situation and throw
2813 // an exception if necessary. Eventually we may want to change this so
2814 // that we only grab the lock if the thread was created successfully -
2815 // then we can also do this check and throw the exception in the
2816 // JavaThread constructor.
2817 if (native_thread->osthread() != NULL) {
2818 // Note: the current thread is not being used within "prepare".
2819 native_thread->prepare(jthread);
2820 }
2821 }
2822 }
2823
2824 if (throw_illegal_thread_state) {
2825 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2826 }
2827
2828 assert(native_thread != NULL, "Starting null thread?");
2829
2830 if (native_thread->osthread() == NULL) {
2831 // No one should hold a reference to the 'native_thread'.
2832 native_thread->smr_delete();
2833 if (JvmtiExport::should_post_resource_exhausted()) {
2834 JvmtiExport::post_resource_exhausted(
2835 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2836 os::native_thread_creation_failed_msg());
2837 }
2838 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2839 os::native_thread_creation_failed_msg());
2840 }
2841
2842 Thread::start(native_thread);
2843
2844 JVM_END
2845
2846
2847 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2848 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2849 // but is thought to be reliable and simple. In the case, where the receiver is the
2850 // same thread as the sender, no VM_Operation is needed.
2851 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2852 JVMWrapper("JVM_StopThread");
2853
2854 // A nested ThreadsListHandle will grab the Threads_lock so create
2855 // tlh before we resolve throwable.
2856 ThreadsListHandle tlh(thread);
2857 oop java_throwable = JNIHandles::resolve(throwable);
2858 if (java_throwable == NULL) {
2859 THROW(vmSymbols::java_lang_NullPointerException());
2860 }
2861 oop java_thread = NULL;
2862 JavaThread* receiver = NULL;
2863 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2864 Events::log_exception(thread,
2865 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2866 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2867
2868 if (is_alive) {
2869 // jthread refers to a live JavaThread.
2870 if (thread == receiver) {
2871 // Exception is getting thrown at self so no VM_Operation needed.
2872 THROW_OOP(java_throwable);
2873 } else {
2874 // Use a VM_Operation to throw the exception.
2875 Thread::send_async_exception(java_thread, java_throwable);
2876 }
2877 } else {
2878 // Either:
2879 // - target thread has not been started before being stopped, or
2880 // - target thread already terminated
2881 // We could read the threadStatus to determine which case it is
2882 // but that is overkill as it doesn't matter. We must set the
2883 // stillborn flag for the first case, and if the thread has already
2884 // exited setting this flag has no effect.
2885 java_lang_Thread::set_stillborn(java_thread);
2886 }
2887 JVM_END
2888
2889
2890 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2891 JVMWrapper("JVM_IsThreadAlive");
2892
2893 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2894 return java_lang_Thread::is_alive(thread_oop);
2895 JVM_END
2896
2897
2898 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2899 JVMWrapper("JVM_SuspendThread");
2900
2901 ThreadsListHandle tlh(thread);
2902 JavaThread* receiver = NULL;
2903 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2904 if (is_alive) {
2905 // jthread refers to a live JavaThread.
2906 {
2907 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2908 if (receiver->is_external_suspend()) {
2909 // Don't allow nested external suspend requests. We can't return
2910 // an error from this interface so just ignore the problem.
2911 return;
2912 }
2913 if (receiver->is_exiting()) { // thread is in the process of exiting
2914 return;
2915 }
2916 receiver->set_external_suspend();
2917 }
2918
2919 // java_suspend() will catch threads in the process of exiting
2920 // and will ignore them.
2921 receiver->java_suspend();
2922
2923 // It would be nice to have the following assertion in all the
2924 // time, but it is possible for a racing resume request to have
2925 // resumed this thread right after we suspended it. Temporarily
2926 // enable this assertion if you are chasing a different kind of
2927 // bug.
2928 //
2929 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2930 // receiver->is_being_ext_suspended(), "thread is not suspended");
2931 }
2932 JVM_END
2933
2934
2935 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2936 JVMWrapper("JVM_ResumeThread");
2937
2938 ThreadsListHandle tlh(thread);
2939 JavaThread* receiver = NULL;
2940 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2941 if (is_alive) {
2942 // jthread refers to a live JavaThread.
2943
2944 // This is the original comment for this Threads_lock grab:
2945 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2946 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2947 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2948 // looks at it.
2949 //
2950 // The above comment dates back to when we had both internal and
2951 // external suspend APIs that shared a common underlying mechanism.
2952 // External suspend is now entirely cooperative and doesn't share
2953 // anything with internal suspend. That said, there are some
2954 // assumptions in the VM that an external resume grabs the
2955 // Threads_lock. We can't drop the Threads_lock grab here until we
2956 // resolve the assumptions that exist elsewhere.
2957 //
2958 MutexLocker ml(Threads_lock);
2959 receiver->java_resume();
2960 }
2961 JVM_END
2962
2963
2964 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2965 JVMWrapper("JVM_SetThreadPriority");
2966
2967 ThreadsListHandle tlh(thread);
2968 oop java_thread = NULL;
2969 JavaThread* receiver = NULL;
2970 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2971 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2972
2973 if (is_alive) {
2974 // jthread refers to a live JavaThread.
2975 Thread::set_priority(receiver, (ThreadPriority)prio);
2976 }
2977 // Implied else: If the JavaThread hasn't started yet, then the
2978 // priority set in the java.lang.Thread object above will be pushed
2979 // down when it does start.
2980 JVM_END
2981
2982
2983 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2984 JVMWrapper("JVM_Yield");
2985 if (os::dont_yield()) return;
2986 HOTSPOT_THREAD_YIELD();
2987 os::naked_yield();
2988 JVM_END
2989
2990 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
2991 assert(event != NULL, "invariant");
2992 assert(event->should_commit(), "invariant");
2993 event->set_time(millis);
2994 event->commit();
2995 }
2996
2997 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2998 JVMWrapper("JVM_Sleep");
2999
3000 if (millis < 0) {
3001 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3002 }
3003
3004 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3005 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3006 }
3007
3008 // Save current thread state and restore it at the end of this block.
3009 // And set new thread state to SLEEPING.
3010 JavaThreadSleepState jtss(thread);
3011
3012 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3013 EventThreadSleep event;
3014
3015 if (millis == 0) {
3016 os::naked_yield();
3017 } else {
3018 ThreadState old_state = thread->osthread()->get_state();
3019 thread->osthread()->set_state(SLEEPING);
3020 if (!thread->sleep(millis)) { // interrupted
3021 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3022 // us while we were sleeping. We do not overwrite those.
3023 if (!HAS_PENDING_EXCEPTION) {
3024 if (event.should_commit()) {
3025 post_thread_sleep_event(&event, millis);
3026 }
3027 HOTSPOT_THREAD_SLEEP_END(1);
3028
3029 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3030 // to properly restore the thread state. That's likely wrong.
3031 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3032 }
3033 }
3034 thread->osthread()->set_state(old_state);
3035 }
3036 if (event.should_commit()) {
3037 post_thread_sleep_event(&event, millis);
3038 }
3039 HOTSPOT_THREAD_SLEEP_END(0);
3040 JVM_END
3041
3042 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3043 JVMWrapper("JVM_CurrentThread");
3044 oop jthread = thread->threadObj();
3045 assert (thread != NULL, "no current thread!");
3046 return JNIHandles::make_local(env, jthread);
3047 JVM_END
3048
3049 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3050 JVMWrapper("JVM_Interrupt");
3051
3052 ThreadsListHandle tlh(thread);
3053 JavaThread* receiver = NULL;
3054 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3055 if (is_alive) {
3056 // jthread refers to a live JavaThread.
3057 receiver->interrupt();
3058 }
3059 JVM_END
3060
3061
3062 // Return true iff the current thread has locked the object passed in
3063
3064 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3065 JVMWrapper("JVM_HoldsLock");
3066 assert(THREAD->is_Java_thread(), "sanity check");
3067 if (obj == NULL) {
3068 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3069 }
3070 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3071 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3072 JVM_END
3073
3074
3075 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3076 JVMWrapper("JVM_DumpAllStacks");
3077 VM_PrintThreads op;
3078 VMThread::execute(&op);
3079 if (JvmtiExport::should_post_data_dump()) {
3080 JvmtiExport::post_data_dump();
3081 }
3082 JVM_END
3083
3084 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3085 JVMWrapper("JVM_SetNativeThreadName");
3086
3087 // We don't use a ThreadsListHandle here because the current thread
3088 // must be alive.
3089 oop java_thread = JNIHandles::resolve_non_null(jthread);
3090 JavaThread* thr = java_lang_Thread::thread(java_thread);
3091 if (thread == thr && !thr->has_attached_via_jni()) {
3092 // Thread naming is only supported for the current thread and
3093 // we don't set the name of an attached thread to avoid stepping
3094 // on other programs.
3095 ResourceMark rm(thread);
3096 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3097 os::set_native_thread_name(thread_name);
3098 }
3099 JVM_END
3100
3101 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3102
3103 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3104 JVMWrapper("JVM_GetClassContext");
3105 ResourceMark rm(THREAD);
3106 JvmtiVMObjectAllocEventCollector oam;
3107 vframeStream vfst(thread);
3108
3109 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3110 // This must only be called from SecurityManager.getClassContext
3111 Method* m = vfst.method();
3112 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3113 m->name() == vmSymbols::getClassContext_name() &&
3114 m->signature() == vmSymbols::void_class_array_signature())) {
3115 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3116 }
3117 }
3118
3119 // Collect method holders
3120 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3121 for (; !vfst.at_end(); vfst.security_next()) {
3122 Method* m = vfst.method();
3123 // Native frames are not returned
3124 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3125 Klass* holder = m->method_holder();
3126 assert(holder->is_klass(), "just checking");
3127 klass_array->append(holder);
3128 }
3129 }
3130
3131 // Create result array of type [Ljava/lang/Class;
3132 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3133 // Fill in mirrors corresponding to method holders
3134 for (int i = 0; i < klass_array->length(); i++) {
3135 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3136 }
3137
3138 return (jobjectArray) JNIHandles::make_local(env, result);
3139 JVM_END
3140
3141
3142 // java.lang.Package ////////////////////////////////////////////////////////////////
3143
3144
3145 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3146 JVMWrapper("JVM_GetSystemPackage");
3147 ResourceMark rm(THREAD);
3148 JvmtiVMObjectAllocEventCollector oam;
3149 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3150 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3151 return (jstring) JNIHandles::make_local(result);
3152 JVM_END
3153
3154
3155 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3156 JVMWrapper("JVM_GetSystemPackages");
3157 JvmtiVMObjectAllocEventCollector oam;
3158 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3159 return (jobjectArray) JNIHandles::make_local(result);
3160 JVM_END
3161
3162
3163 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3164
3165
3166 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3167 JVMWrapper("JVM_GetAndClearReferencePendingList");
3168
3169 MonitorLocker ml(Heap_lock);
3170 oop ref = Universe::reference_pending_list();
3171 if (ref != NULL) {
3172 Universe::set_reference_pending_list(NULL);
3173 }
3174 return JNIHandles::make_local(env, ref);
3175 JVM_END
3176
3177 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3178 JVMWrapper("JVM_HasReferencePendingList");
3179 MonitorLocker ml(Heap_lock);
3180 return Universe::has_reference_pending_list();
3181 JVM_END
3182
3183 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3184 JVMWrapper("JVM_WaitForReferencePendingList");
3185 MonitorLocker ml(Heap_lock);
3186 while (!Universe::has_reference_pending_list()) {
3187 ml.wait();
3188 }
3189 JVM_END
3190
3191
3192 // ObjectInputStream ///////////////////////////////////////////////////////////////
3193
3194 // Return the first user-defined class loader up the execution stack, or null
3195 // if only code from the bootstrap or platform class loader is on the stack.
3196
3197 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3198 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3199 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3200 oop loader = vfst.method()->method_holder()->class_loader();
3201 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3202 return JNIHandles::make_local(env, loader);
3203 }
3204 }
3205 return NULL;
3206 JVM_END
3207
3208
3209 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3210
3211
3212 // resolve array handle and check arguments
3213 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3214 if (arr == NULL) {
3215 THROW_0(vmSymbols::java_lang_NullPointerException());
3216 }
3217 oop a = JNIHandles::resolve_non_null(arr);
3218 if (!a->is_array()) {
3219 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3220 } else if (type_array_only && !a->is_typeArray()) {
3221 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3222 }
3223 return arrayOop(a);
3224 }
3225
3226
3227 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3228 JVMWrapper("JVM_GetArrayLength");
3229 arrayOop a = check_array(env, arr, false, CHECK_0);
3230 return a->length();
3231 JVM_END
3232
3233
3234 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3235 JVMWrapper("JVM_Array_Get");
3236 JvmtiVMObjectAllocEventCollector oam;
3237 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3238 jvalue value;
3239 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3240 oop box = Reflection::box(&value, type, CHECK_NULL);
3241 return JNIHandles::make_local(env, box);
3242 JVM_END
3243
3244
3245 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3246 JVMWrapper("JVM_GetPrimitiveArrayElement");
3247 jvalue value;
3248 value.i = 0; // to initialize value before getting used in CHECK
3249 arrayOop a = check_array(env, arr, true, CHECK_(value));
3250 assert(a->is_typeArray(), "just checking");
3251 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3252 BasicType wide_type = (BasicType) wCode;
3253 if (type != wide_type) {
3254 Reflection::widen(&value, type, wide_type, CHECK_(value));
3255 }
3256 return value;
3257 JVM_END
3258
3259
3260 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3261 JVMWrapper("JVM_SetArrayElement");
3262 arrayOop a = check_array(env, arr, false, CHECK);
3263 oop box = JNIHandles::resolve(val);
3264 jvalue value;
3265 value.i = 0; // to initialize value before getting used in CHECK
3266 BasicType value_type;
3267 if (a->is_objArray()) {
3268 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3269 value_type = Reflection::unbox_for_regular_object(box, &value);
3270 } else {
3271 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3272 }
3273 Reflection::array_set(&value, a, index, value_type, CHECK);
3274 JVM_END
3275
3276
3277 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3278 JVMWrapper("JVM_SetPrimitiveArrayElement");
3279 arrayOop a = check_array(env, arr, true, CHECK);
3280 assert(a->is_typeArray(), "just checking");
3281 BasicType value_type = (BasicType) vCode;
3282 Reflection::array_set(&v, a, index, value_type, CHECK);
3283 JVM_END
3284
3285
3286 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3287 JVMWrapper("JVM_NewArray");
3288 JvmtiVMObjectAllocEventCollector oam;
3289 oop element_mirror = JNIHandles::resolve(eltClass);
3290 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3291 return JNIHandles::make_local(env, result);
3292 JVM_END
3293
3294
3295 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3296 JVMWrapper("JVM_NewMultiArray");
3297 JvmtiVMObjectAllocEventCollector oam;
3298 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3299 oop element_mirror = JNIHandles::resolve(eltClass);
3300 assert(dim_array->is_typeArray(), "just checking");
3301 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3302 return JNIHandles::make_local(env, result);
3303 JVM_END
3304
3305
3306 // Library support ///////////////////////////////////////////////////////////////////////////
3307
3308 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3309 //%note jvm_ct
3310 JVMWrapper("JVM_LoadLibrary");
3311 char ebuf[1024];
3312 void *load_result;
3313 {
3314 ThreadToNativeFromVM ttnfvm(thread);
3315 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3316 }
3317 if (load_result == NULL) {
3318 char msg[1024];
3319 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3320 // Since 'ebuf' may contain a string encoded using
3321 // platform encoding scheme, we need to pass
3322 // Exceptions::unsafe_to_utf8 to the new_exception method
3323 // as the last argument. See bug 6367357.
3324 Handle h_exception =
3325 Exceptions::new_exception(thread,
3326 vmSymbols::java_lang_UnsatisfiedLinkError(),
3327 msg, Exceptions::unsafe_to_utf8);
3328
3329 THROW_HANDLE_0(h_exception);
3330 }
3331 return load_result;
3332 JVM_END
3333
3334
3335 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3336 JVMWrapper("JVM_UnloadLibrary");
3337 os::dll_unload(handle);
3338 JVM_END
3339
3340
3341 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3342 JVMWrapper("JVM_FindLibraryEntry");
3343 return os::dll_lookup(handle, name);
3344 JVM_END
3345
3346
3347 // JNI version ///////////////////////////////////////////////////////////////////////////////
3348
3349 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3350 JVMWrapper("JVM_IsSupportedJNIVersion");
3351 return Threads::is_supported_jni_version_including_1_1(version);
3352 JVM_END
3353
3354
3355 // String support ///////////////////////////////////////////////////////////////////////////
3356
3357 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3358 JVMWrapper("JVM_InternString");
3359 JvmtiVMObjectAllocEventCollector oam;
3360 if (str == NULL) return NULL;
3361 oop string = JNIHandles::resolve_non_null(str);
3362 oop result = StringTable::intern(string, CHECK_NULL);
3363 return (jstring) JNIHandles::make_local(env, result);
3364 JVM_END
3365
3366
3367 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3368
3369 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3370 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3371 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3372 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3373 // nature. JavaThreads will be "in native" when using this API from JDK code.
3374
3375
3376 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3377 VM_Exit::block_if_vm_exited();
3378 JVMWrapper("JVM_RawMonitorCreate");
3379 return new os::PlatformMutex();
3380 }
3381
3382
3383 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3384 VM_Exit::block_if_vm_exited();
3385 JVMWrapper("JVM_RawMonitorDestroy");
3386 delete ((os::PlatformMutex*) mon);
3387 }
3388
3389
3390 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3391 VM_Exit::block_if_vm_exited();
3392 JVMWrapper("JVM_RawMonitorEnter");
3393 ((os::PlatformMutex*) mon)->lock();
3394 return 0;
3395 }
3396
3397
3398 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3399 VM_Exit::block_if_vm_exited();
3400 JVMWrapper("JVM_RawMonitorExit");
3401 ((os::PlatformMutex*) mon)->unlock();
3402 }
3403
3404
3405 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3406
3407 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3408 Handle loader, Handle protection_domain,
3409 jboolean throwError, TRAPS) {
3410 // Security Note:
3411 // The Java level wrapper will perform the necessary security check allowing
3412 // us to pass the NULL as the initiating class loader. The VM is responsible for
3413 // the checkPackageAccess relative to the initiating class loader via the
3414 // protection_domain. The protection_domain is passed as NULL by the java code
3415 // if there is no security manager in 3-arg Class.forName().
3416 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3417
3418 // Check if we should initialize the class
3419 if (init && klass->is_instance_klass()) {
3420 klass->initialize(CHECK_NULL);
3421 }
3422 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3423 }
3424
3425
3426 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3427
3428 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3429 JVMWrapper("JVM_InvokeMethod");
3430 Handle method_handle;
3431 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3432 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3433 Handle receiver(THREAD, JNIHandles::resolve(obj));
3434 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3435 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3436 jobject res = JNIHandles::make_local(env, result);
3437 if (JvmtiExport::should_post_vm_object_alloc()) {
3438 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3439 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3440 if (java_lang_Class::is_primitive(ret_type)) {
3441 // Only for primitive type vm allocates memory for java object.
3442 // See box() method.
3443 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3444 }
3445 }
3446 return res;
3447 } else {
3448 THROW_0(vmSymbols::java_lang_StackOverflowError());
3449 }
3450 JVM_END
3451
3452
3453 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3454 JVMWrapper("JVM_NewInstanceFromConstructor");
3455 oop constructor_mirror = JNIHandles::resolve(c);
3456 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3457 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3458 jobject res = JNIHandles::make_local(env, result);
3459 if (JvmtiExport::should_post_vm_object_alloc()) {
3460 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3461 }
3462 return res;
3463 JVM_END
3464
3465 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3466
3467 JVM_LEAF(jboolean, JVM_SupportsCX8())
3468 JVMWrapper("JVM_SupportsCX8");
3469 return VM_Version::supports_cx8();
3470 JVM_END
3471
3472 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3473 JVMWrapper("JVM_InitializeFromArchive");
3474 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3475 assert(k->is_klass(), "just checking");
3476 HeapShared::initialize_from_archived_subgraph(k);
3477 JVM_END
3478
3479 // Returns an array of all live Thread objects (VM internal JavaThreads,
3480 // jvmti agent threads, and JNI attaching threads are skipped)
3481 // See CR 6404306 regarding JNI attaching threads
3482 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3483 ResourceMark rm(THREAD);
3484 ThreadsListEnumerator tle(THREAD, false, false);
3485 JvmtiVMObjectAllocEventCollector oam;
3486
3487 int num_threads = tle.num_threads();
3488 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3489 objArrayHandle threads_ah(THREAD, r);
3490
3491 for (int i = 0; i < num_threads; i++) {
3492 Handle h = tle.get_threadObj(i);
3493 threads_ah->obj_at_put(i, h());
3494 }
3495
3496 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3497 JVM_END
3498
3499
3500 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3501 // Return StackTraceElement[][], each element is the stack trace of a thread in
3502 // the corresponding entry in the given threads array
3503 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3504 JVMWrapper("JVM_DumpThreads");
3505 JvmtiVMObjectAllocEventCollector oam;
3506
3507 // Check if threads is null
3508 if (threads == NULL) {
3509 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3510 }
3511
3512 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3513 objArrayHandle ah(THREAD, a);
3514 int num_threads = ah->length();
3515 // check if threads is non-empty array
3516 if (num_threads == 0) {
3517 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3518 }
3519
3520 // check if threads is not an array of objects of Thread class
3521 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3522 if (k != SystemDictionary::Thread_klass()) {
3523 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3524 }
3525
3526 ResourceMark rm(THREAD);
3527
3528 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3529 for (int i = 0; i < num_threads; i++) {
3530 oop thread_obj = ah->obj_at(i);
3531 instanceHandle h(THREAD, (instanceOop) thread_obj);
3532 thread_handle_array->append(h);
3533 }
3534
3535 // The JavaThread references in thread_handle_array are validated
3536 // in VM_ThreadDump::doit().
3537 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3538 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3539
3540 JVM_END
3541
3542 // JVM monitoring and management support
3543 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3544 return Management::get_jmm_interface(version);
3545 JVM_END
3546
3547 // com.sun.tools.attach.VirtualMachine agent properties support
3548 //
3549 // Initialize the agent properties with the properties maintained in the VM
3550 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3551 JVMWrapper("JVM_InitAgentProperties");
3552 ResourceMark rm;
3553
3554 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3555
3556 PUTPROP(props, "sun.java.command", Arguments::java_command());
3557 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3558 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3559 return properties;
3560 JVM_END
3561
3562 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3563 {
3564 JVMWrapper("JVM_GetEnclosingMethodInfo");
3565 JvmtiVMObjectAllocEventCollector oam;
3566
3567 if (ofClass == NULL) {
3568 return NULL;
3569 }
3570 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3571 // Special handling for primitive objects
3572 if (java_lang_Class::is_primitive(mirror())) {
3573 return NULL;
3574 }
3575 Klass* k = java_lang_Class::as_Klass(mirror());
3576 if (!k->is_instance_klass()) {
3577 return NULL;
3578 }
3579 InstanceKlass* ik = InstanceKlass::cast(k);
3580 int encl_method_class_idx = ik->enclosing_method_class_index();
3581 if (encl_method_class_idx == 0) {
3582 return NULL;
3583 }
3584 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3585 objArrayHandle dest(THREAD, dest_o);
3586 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3587 dest->obj_at_put(0, enc_k->java_mirror());
3588 int encl_method_method_idx = ik->enclosing_method_method_index();
3589 if (encl_method_method_idx != 0) {
3590 Symbol* sym = ik->constants()->symbol_at(
3591 extract_low_short_from_int(
3592 ik->constants()->name_and_type_at(encl_method_method_idx)));
3593 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3594 dest->obj_at_put(1, str());
3595 sym = ik->constants()->symbol_at(
3596 extract_high_short_from_int(
3597 ik->constants()->name_and_type_at(encl_method_method_idx)));
3598 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3599 dest->obj_at_put(2, str());
3600 }
3601 return (jobjectArray) JNIHandles::make_local(dest());
3602 }
3603 JVM_END
3604
3605 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3606 {
3607 memset(info, 0, info_size);
3608
3609 info->jvm_version = VM_Version::jvm_version();
3610 info->patch_version = VM_Version::vm_patch_version();
3611
3612 // when we add a new capability in the jvm_version_info struct, we should also
3613 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3614 // counter defined in runtimeService.cpp.
3615 info->is_attach_supported = AttachListener::is_attach_supported();
3616 }
3617 JVM_END
3618
3619 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3620 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3621 ResourceMark rm(THREAD);
3622
3623 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3624 return NULL;
3625 }
3626
3627 char** vm_flags = Arguments::jvm_flags_array();
3628 char** vm_args = Arguments::jvm_args_array();
3629 int num_flags = Arguments::num_jvm_flags();
3630 int num_args = Arguments::num_jvm_args();
3631
3632 InstanceKlass* ik = SystemDictionary::String_klass();
3633 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3634 objArrayHandle result_h(THREAD, r);
3635
3636 int index = 0;
3637 for (int j = 0; j < num_flags; j++, index++) {
3638 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3639 result_h->obj_at_put(index, h());
3640 }
3641 for (int i = 0; i < num_args; i++, index++) {
3642 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3643 result_h->obj_at_put(index, h());
3644 }
3645 return (jobjectArray) JNIHandles::make_local(env, result_h());
3646 JVM_END
3647
3648 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3649 return os::get_signal_number(name);
3650 JVM_END