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 "jfr/jfrEvents.hpp"
42 #include "logging/log.hpp"
43 #include "memory/heapShared.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/referenceType.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "memory/universe.hpp"
48 #include "oops/access.inline.hpp"
49 #include "oops/constantPool.hpp"
50 #include "oops/fieldStreams.hpp"
51 #include "oops/instanceKlass.hpp"
52 #include "oops/method.hpp"
53 #include "oops/objArrayKlass.hpp"
54 #include "oops/objArrayOop.inline.hpp"
55 #include "oops/oop.inline.hpp"
56 #include "prims/jvm_misc.hpp"
57 #include "prims/jvmtiExport.hpp"
58 #include "prims/jvmtiThreadState.hpp"
59 #include "prims/nativeLookup.hpp"
60 #include "prims/stackwalk.hpp"
61 #include "runtime/arguments.hpp"
62 #include "runtime/atomic.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/init.hpp"
65 #include "runtime/interfaceSupport.inline.hpp"
66 #include "runtime/deoptimization.hpp"
67 #include "runtime/handshake.hpp"
68 #include "runtime/java.hpp"
69 #include "runtime/javaCalls.hpp"
70 #include "runtime/jfieldIDWorkaround.hpp"
71 #include "runtime/jniHandles.inline.hpp"
72 #include "runtime/orderAccess.hpp"
73 #include "runtime/os.inline.hpp"
74 #include "runtime/perfData.hpp"
75 #include "runtime/reflection.hpp"
76 #include "runtime/thread.inline.hpp"
77 #include "runtime/threadSMR.hpp"
78 #include "runtime/vframe.inline.hpp"
79 #include "runtime/vmOperations.hpp"
80 #include "runtime/vm_version.hpp"
81 #include "services/attachListener.hpp"
82 #include "services/management.hpp"
83 #include "services/threadService.hpp"
84 #include "utilities/copy.hpp"
85 #include "utilities/defaultStream.hpp"
86 #include "utilities/dtrace.hpp"
87 #include "utilities/events.hpp"
88 #include "utilities/histogram.hpp"
89 #include "utilities/macros.hpp"
90 #include "utilities/utf8.hpp"
91 #if INCLUDE_CDS
92 #include "classfile/systemDictionaryShared.hpp"
93 #endif
94
95 #include <errno.h>
96
97 /*
98 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
99 such ctors and calls MUST NOT come between an oop declaration/init and its
100 usage because if objects are move this may cause various memory stomps, bus
101 errors and segfaults. Here is a cookbook for causing so called "naked oop
102 failures":
103
104 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
105 JVMWrapper("JVM_GetClassDeclaredFields");
106
107 // Object address to be held directly in mirror & not visible to GC
108 oop mirror = JNIHandles::resolve_non_null(ofClass);
109
110 // If this ctor can hit a safepoint, moving objects around, then
111 ComplexConstructor foo;
112
113 // Boom! mirror may point to JUNK instead of the intended object
114 (some dereference of mirror)
115
116 // Here's another call that may block for GC, making mirror stale
117 MutexLocker ml(some_lock);
118
119 // And here's an initializer that can result in a stale oop
120 // all in one step.
121 oop o = call_that_can_throw_exception(TRAPS);
122
123
124 The solution is to keep the oop declaration BELOW the ctor or function
125 call that might cause a GC, do another resolve to reassign the oop, or
126 consider use of a Handle instead of an oop so there is immunity from object
127 motion. But note that the "QUICK" entries below do not have a handlemark
128 and thus can only support use of handles passed in.
129 */
130
131 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
132 ResourceMark rm;
133 int line_number = -1;
134 const char * source_file = NULL;
135 const char * trace = "explicit";
136 InstanceKlass* caller = NULL;
137 JavaThread* jthread = JavaThread::current();
138 if (jthread->has_last_Java_frame()) {
139 vframeStream vfst(jthread);
140
141 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
142 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
143 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
144 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
145 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
146
147 Method* last_caller = NULL;
148
149 while (!vfst.at_end()) {
150 Method* m = vfst.method();
151 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
152 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
153 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
154 break;
155 }
156 last_caller = m;
157 vfst.next();
158 }
159 // if this is called from Class.forName0 and that is called from Class.forName,
160 // then print the caller of Class.forName. If this is Class.loadClass, then print
161 // that caller, otherwise keep quiet since this should be picked up elsewhere.
162 bool found_it = false;
163 if (!vfst.at_end() &&
164 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
165 vfst.method()->name() == vmSymbols::forName0_name()) {
166 vfst.next();
167 if (!vfst.at_end() &&
168 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
169 vfst.method()->name() == vmSymbols::forName_name()) {
170 vfst.next();
171 found_it = true;
172 }
173 } else if (last_caller != NULL &&
174 last_caller->method_holder()->name() ==
175 vmSymbols::java_lang_ClassLoader() &&
176 last_caller->name() == vmSymbols::loadClass_name()) {
177 found_it = true;
178 } else if (!vfst.at_end()) {
179 if (vfst.method()->is_native()) {
180 // JNI call
181 found_it = true;
182 }
183 }
184 if (found_it && !vfst.at_end()) {
185 // found the caller
186 caller = vfst.method()->method_holder();
187 line_number = vfst.method()->line_number_from_bci(vfst.bci());
188 if (line_number == -1) {
189 // show method name if it's a native method
190 trace = vfst.method()->name_and_sig_as_C_string();
191 }
192 Symbol* s = caller->source_file_name();
193 if (s != NULL) {
194 source_file = s->as_C_string();
195 }
196 }
197 }
198 if (caller != NULL) {
199 if (to_class != caller) {
200 const char * from = caller->external_name();
201 const char * to = to_class->external_name();
202 // print in a single call to reduce interleaving between threads
203 if (source_file != NULL) {
204 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
205 } else {
206 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
207 }
208 }
209 }
210 }
211
212 void trace_class_resolution(Klass* to_class) {
213 EXCEPTION_MARK;
214 trace_class_resolution_impl(to_class, THREAD);
215 if (HAS_PENDING_EXCEPTION) {
216 CLEAR_PENDING_EXCEPTION;
217 }
218 }
219
220 // Wrapper to trace JVM functions
221
222 #ifdef ASSERT
223 Histogram* JVMHistogram;
224 volatile int JVMHistogram_lock = 0;
225
226 class JVMHistogramElement : public HistogramElement {
227 public:
228 JVMHistogramElement(const char* name);
229 };
230
231 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
232 _name = elementName;
233 uintx count = 0;
234
235 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
236 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
237 count +=1;
238 if ( (WarnOnStalledSpinLock > 0)
239 && (count % WarnOnStalledSpinLock == 0)) {
240 warning("JVMHistogram_lock seems to be stalled");
241 }
242 }
243 }
244
245 if(JVMHistogram == NULL)
246 JVMHistogram = new Histogram("JVM Call Counts",100);
247
248 JVMHistogram->add_element(this);
249 Atomic::dec(&JVMHistogram_lock);
250 }
251
252 #define JVMCountWrapper(arg) \
253 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
254 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
255
256 #define JVMWrapper(arg) JVMCountWrapper(arg);
257 #else
258 #define JVMWrapper(arg)
259 #endif
260
261
262 // Interface version /////////////////////////////////////////////////////////////////////
263
264
265 JVM_LEAF(jint, JVM_GetInterfaceVersion())
266 return JVM_INTERFACE_VERSION;
267 JVM_END
268
269
270 // java.lang.System //////////////////////////////////////////////////////////////////////
271
272
273 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
274 JVMWrapper("JVM_CurrentTimeMillis");
275 return os::javaTimeMillis();
276 JVM_END
277
278 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
279 JVMWrapper("JVM_NanoTime");
280 return os::javaTimeNanos();
281 JVM_END
282
283 // The function below is actually exposed by jdk.internal.misc.VM and not
284 // java.lang.System, but we choose to keep it here so that it stays next
285 // to JVM_CurrentTimeMillis and JVM_NanoTime
286
287 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
288 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
289
290 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
291 JVMWrapper("JVM_GetNanoTimeAdjustment");
292 jlong seconds;
293 jlong nanos;
294
295 os::javaTimeSystemUTC(seconds, nanos);
296
297 // We're going to verify that the result can fit in a long.
298 // For that we need the difference in seconds between 'seconds'
299 // and 'offset_secs' to be such that:
300 // |seconds - offset_secs| < (2^63/10^9)
301 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
302 // which makes |seconds - offset_secs| < 2^33
303 // and we will prefer +/- 2^32 as the maximum acceptable diff
304 // as 2^32 has a more natural feel than 2^33...
305 //
306 // So if |seconds - offset_secs| >= 2^32 - we return a special
307 // sentinel value (-1) which the caller should take as an
308 // exception value indicating that the offset given to us is
309 // too far from range of the current time - leading to too big
310 // a nano adjustment. The caller is expected to recover by
311 // computing a more accurate offset and calling this method
312 // again. (For the record 2^32 secs is ~136 years, so that
313 // should rarely happen)
314 //
315 jlong diff = seconds - offset_secs;
316 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
317 return -1; // sentinel value: the offset is too far off the target
318 }
319
320 // return the adjustment. If you compute a time by adding
321 // this number of nanoseconds along with the number of seconds
322 // in the offset you should get the current UTC time.
323 return (diff * (jlong)1000000000) + nanos;
324 JVM_END
325
326 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
327 jobject dst, jint dst_pos, jint length))
328 JVMWrapper("JVM_ArrayCopy");
329 // Check if we have null pointers
330 if (src == NULL || dst == NULL) {
331 THROW(vmSymbols::java_lang_NullPointerException());
332 }
333 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
334 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
335 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
336 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
337 // Do copy
338 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
339 JVM_END
340
341
342 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
343 JavaValue r(T_OBJECT);
344 // public synchronized Object put(Object key, Object value);
345 HandleMark hm(THREAD);
346 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
347 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
348 JavaCalls::call_virtual(&r,
349 props,
350 SystemDictionary::Properties_klass(),
351 vmSymbols::put_name(),
352 vmSymbols::object_object_object_signature(),
353 key_str,
354 value_str,
355 THREAD);
356 }
357
358
359 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
360
361 /*
362 * Return all of the system properties in a Java String array with alternating
363 * names and values from the jvm SystemProperty.
364 * Which includes some internal and all commandline -D defined properties.
365 */
366 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
367 JVMWrapper("JVM_GetProperties");
368 ResourceMark rm(THREAD);
369 HandleMark hm(THREAD);
370 int ndx = 0;
371 int fixedCount = 2;
372
373 SystemProperty* p = Arguments::system_properties();
374 int count = Arguments::PropertyList_count(p);
375
376 // Allocate result String array
377 InstanceKlass* ik = SystemDictionary::String_klass();
378 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
379 objArrayHandle result_h(THREAD, r);
380
381 while (p != NULL) {
382 const char * key = p->key();
383 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
384 const char * value = p->value();
385 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
386 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
387 result_h->obj_at_put(ndx * 2, key_str());
388 result_h->obj_at_put(ndx * 2 + 1, value_str());
389 ndx++;
390 }
391 p = p->next();
392 }
393
394 // Convert the -XX:MaxDirectMemorySize= command line flag
395 // to the sun.nio.MaxDirectMemorySize property.
396 // Do this after setting user properties to prevent people
397 // from setting the value with a -D option, as requested.
398 // Leave empty if not supplied
399 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
400 char as_chars[256];
401 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
402 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
403 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
404 result_h->obj_at_put(ndx * 2, key_str());
405 result_h->obj_at_put(ndx * 2 + 1, value_str());
406 ndx++;
407 }
408
409 // JVM monitoring and management support
410 // Add the sun.management.compiler property for the compiler's name
411 {
412 #undef CSIZE
413 #if defined(_LP64) || defined(_WIN64)
414 #define CSIZE "64-Bit "
415 #else
416 #define CSIZE
417 #endif // 64bit
418
419 #ifdef TIERED
420 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
421 #else
422 #if defined(COMPILER1)
423 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
424 #elif defined(COMPILER2)
425 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
426 #elif INCLUDE_JVMCI
427 #error "INCLUDE_JVMCI should imply TIERED"
428 #else
429 const char* compiler_name = "";
430 #endif // compilers
431 #endif // TIERED
432
433 if (*compiler_name != '\0' &&
434 (Arguments::mode() != Arguments::_int)) {
435 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
436 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
437 result_h->obj_at_put(ndx * 2, key_str());
438 result_h->obj_at_put(ndx * 2 + 1, value_str());
439 ndx++;
440 }
441 }
442
443 return (jobjectArray) JNIHandles::make_local(env, result_h());
444 JVM_END
445
446
447 /*
448 * Return the temporary directory that the VM uses for the attach
449 * and perf data files.
450 *
451 * It is important that this directory is well-known and the
452 * same for all VM instances. It cannot be affected by configuration
453 * variables such as java.io.tmpdir.
454 */
455 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
456 JVMWrapper("JVM_GetTemporaryDirectory");
457 HandleMark hm(THREAD);
458 const char* temp_dir = os::get_temp_directory();
459 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
460 return (jstring) JNIHandles::make_local(env, h());
461 JVM_END
462
463
464 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
465
466 extern volatile jint vm_created;
467
468 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
469 JVMWrapper("JVM_BeforeHalt");
470 EventShutdown event;
471 if (event.should_commit()) {
472 event.set_reason("Shutdown requested from Java");
473 event.commit();
474 }
475 JVM_END
476
477
478 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
479 before_exit(thread);
480 vm_exit(code);
481 JVM_END
482
483
484 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
485 JVMWrapper("JVM_GC");
486 if (!DisableExplicitGC) {
487 Universe::heap()->collect(GCCause::_java_lang_system_gc);
488 }
489 JVM_END
490
491
492 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
493 JVMWrapper("JVM_MaxObjectInspectionAge");
494 return Universe::heap()->millis_since_last_gc();
495 JVM_END
496
497
498 static inline jlong convert_size_t_to_jlong(size_t val) {
499 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
500 NOT_LP64 (return (jlong)val;)
501 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
502 }
503
504 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
505 JVMWrapper("JVM_TotalMemory");
506 size_t n = Universe::heap()->capacity();
507 return convert_size_t_to_jlong(n);
508 JVM_END
509
510
511 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
512 JVMWrapper("JVM_FreeMemory");
513 size_t n = Universe::heap()->unused();
514 return convert_size_t_to_jlong(n);
515 JVM_END
516
517
518 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
519 JVMWrapper("JVM_MaxMemory");
520 size_t n = Universe::heap()->max_capacity();
521 return convert_size_t_to_jlong(n);
522 JVM_END
523
524
525 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
526 JVMWrapper("JVM_ActiveProcessorCount");
527 return os::active_processor_count();
528 JVM_END
529
530
531
532 // java.lang.Throwable //////////////////////////////////////////////////////
533
534
535 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
536 JVMWrapper("JVM_FillInStackTrace");
537 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
538 java_lang_Throwable::fill_in_stack_trace(exception);
539 JVM_END
540
541
542 // java.lang.StackTraceElement //////////////////////////////////////////////
543
544
545 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
546 JVMWrapper("JVM_InitStackTraceElementArray");
547 Handle exception(THREAD, JNIHandles::resolve(throwable));
548 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
549 objArrayHandle stack_trace(THREAD, st);
550 // Fill in the allocated stack trace
551 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
552 JVM_END
553
554
555 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
556 JVMWrapper("JVM_InitStackTraceElement");
557 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
558 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
559 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
560 JVM_END
561
562
563 // java.lang.StackWalker //////////////////////////////////////////////////////
564
565
566 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
567 jint skip_frames, jint frame_count, jint start_index,
568 jobjectArray frames))
569 JVMWrapper("JVM_CallStackWalk");
570 JavaThread* jt = (JavaThread*) THREAD;
571 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
572 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
573 }
574
575 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
576
577 // frames array is a Class<?>[] array when only getting caller reference,
578 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
579 // be null.
580 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
581 objArrayHandle frames_array_h(THREAD, fa);
582
583 int limit = start_index + frame_count;
584 if (frames_array_h->length() < limit) {
585 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
586 }
587
588 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
589 start_index, frames_array_h, CHECK_NULL);
590 return JNIHandles::make_local(env, result);
591 JVM_END
592
593
594 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
595 jint frame_count, jint start_index,
596 jobjectArray frames))
597 JVMWrapper("JVM_MoreStackWalk");
598 JavaThread* jt = (JavaThread*) THREAD;
599
600 // frames array is a Class<?>[] array when only getting caller reference,
601 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
602 // be null.
603 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
604 objArrayHandle frames_array_h(THREAD, fa);
605
606 int limit = start_index+frame_count;
607 if (frames_array_h->length() < limit) {
608 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
609 }
610
611 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
612 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
613 start_index, frames_array_h, THREAD);
614 JVM_END
615
616 // java.lang.Object ///////////////////////////////////////////////
617
618
619 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
620 JVMWrapper("JVM_IHashCode");
621 // as implemented in the classic virtual machine; return 0 if object is NULL
622 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
623 JVM_END
624
625
626 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
627 JVMWrapper("JVM_MonitorWait");
628 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
629 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
630 if (JvmtiExport::should_post_monitor_wait()) {
631 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
632
633 // The current thread already owns the monitor and it has not yet
634 // been added to the wait queue so the current thread cannot be
635 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
636 // event handler cannot accidentally consume an unpark() meant for
637 // the ParkEvent associated with this ObjectMonitor.
638 }
639 ObjectSynchronizer::wait(obj, ms, CHECK);
640 JVM_END
641
642
643 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
644 JVMWrapper("JVM_MonitorNotify");
645 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
646 ObjectSynchronizer::notify(obj, CHECK);
647 JVM_END
648
649
650 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
651 JVMWrapper("JVM_MonitorNotifyAll");
652 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
653 ObjectSynchronizer::notifyall(obj, CHECK);
654 JVM_END
655
656
657 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
658 JVMWrapper("JVM_Clone");
659 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
660 Klass* klass = obj->klass();
661 JvmtiVMObjectAllocEventCollector oam;
662
663 #ifdef ASSERT
664 // Just checking that the cloneable flag is set correct
665 if (obj->is_array()) {
666 guarantee(klass->is_cloneable(), "all arrays are cloneable");
667 } else {
668 guarantee(obj->is_instance(), "should be instanceOop");
669 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
670 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
671 }
672 #endif
673
674 // Check if class of obj supports the Cloneable interface.
675 // All arrays are considered to be cloneable (See JLS 20.1.5).
676 // All j.l.r.Reference classes are considered non-cloneable.
677 if (!klass->is_cloneable() ||
678 (klass->is_instance_klass() &&
679 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
680 ResourceMark rm(THREAD);
681 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
682 }
683
684 // Make shallow object copy
685 const int size = obj->size();
686 oop new_obj_oop = NULL;
687 if (obj->is_array()) {
688 const int length = ((arrayOop)obj())->length();
689 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
690 /* do_zero */ true, CHECK_NULL);
691 } else {
692 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
693 }
694
695 HeapAccess<>::clone(obj(), new_obj_oop, size);
696
697 Handle new_obj(THREAD, new_obj_oop);
698 // Caution: this involves a java upcall, so the clone should be
699 // "gc-robust" by this stage.
700 if (klass->has_finalizer()) {
701 assert(obj->is_instance(), "should be instanceOop");
702 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
703 new_obj = Handle(THREAD, new_obj_oop);
704 }
705
706 return JNIHandles::make_local(env, new_obj());
707 JVM_END
708
709 // java.io.File ///////////////////////////////////////////////////////////////
710
711 JVM_LEAF(char*, JVM_NativePath(char* path))
712 JVMWrapper("JVM_NativePath");
713 return os::native_path(path);
714 JVM_END
715
716
717 // Misc. class handling ///////////////////////////////////////////////////////////
718
719
720 JVM_ENTRY(void, JVM_LinkClass(JNIEnv* env, jclass classClass, jclass arg))
721 JVMWrapper("JVM_LinkClass");
722
723 oop r = JNIHandles::resolve(arg);
724 Klass* klass = java_lang_Class::as_Klass(r);
725
726 if (!ClassForNameDeferLinking && klass->is_instance_klass()) {
727 InstanceKlass::cast(klass)->link_class(CHECK);
728 }
729 JVM_END
730
731 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
732 JVMWrapper("JVM_GetCallerClass");
733
734 // Getting the class of the caller frame.
735 //
736 // The call stack at this point looks something like this:
737 //
738 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
739 // [1] [ @CallerSensitive API.method ]
740 // [.] [ (skipped intermediate frames) ]
741 // [n] [ caller ]
742 vframeStream vfst(thread);
743 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
744 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
745 Method* m = vfst.method();
746 assert(m != NULL, "sanity");
747 switch (n) {
748 case 0:
749 // This must only be called from Reflection.getCallerClass
750 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
751 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
752 }
753 // fall-through
754 case 1:
755 // Frame 0 and 1 must be caller sensitive.
756 if (!m->caller_sensitive()) {
757 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
758 }
759 break;
760 default:
761 if (!m->is_ignored_by_security_stack_walk()) {
762 // We have reached the desired frame; return the holder class.
763 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
764 }
765 break;
766 }
767 }
768 return NULL;
769 JVM_END
770
771
772 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
773 JVMWrapper("JVM_FindPrimitiveClass");
774 oop mirror = NULL;
775 BasicType t = name2type(utf);
776 if (t != T_ILLEGAL && !is_reference_type(t)) {
777 mirror = Universe::java_mirror(t);
778 }
779 if (mirror == NULL) {
780 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
781 } else {
782 return (jclass) JNIHandles::make_local(env, mirror);
783 }
784 JVM_END
785
786
787 // Returns a class loaded by the bootstrap class loader; or null
788 // if not found. ClassNotFoundException is not thrown.
789 // FindClassFromBootLoader is exported to the launcher for windows.
790 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
791 const char* name))
792 JVMWrapper("JVM_FindClassFromBootLoader");
793
794 // Java libraries should ensure that name is never null...
795 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
796 // It's impossible to create this class; the name cannot fit
797 // into the constant pool.
798 return NULL;
799 }
800
801 TempNewSymbol h_name = SymbolTable::new_symbol(name);
802 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
803 if (k == NULL) {
804 return NULL;
805 }
806
807 if (log_is_enabled(Debug, class, resolve)) {
808 trace_class_resolution(k);
809 }
810 return (jclass) JNIHandles::make_local(env, k->java_mirror());
811 JVM_END
812
813 // Find a class with this name in this loader, using the caller's protection domain.
814 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
815 jboolean init, jobject loader,
816 jclass caller))
817 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
818 // Java libraries should ensure that name is never null...
819 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
820 // It's impossible to create this class; the name cannot fit
821 // into the constant pool.
822 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
823 }
824
825 TempNewSymbol h_name = SymbolTable::new_symbol(name);
826
827 oop loader_oop = JNIHandles::resolve(loader);
828 oop from_class = JNIHandles::resolve(caller);
829 oop protection_domain = NULL;
830 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
831 // NPE. Put it in another way, the bootstrap class loader has all permission and
832 // thus no checkPackageAccess equivalence in the VM class loader.
833 // The caller is also passed as NULL by the java code if there is no security
834 // manager to avoid the performance cost of getting the calling class.
835 if (from_class != NULL && loader_oop != NULL) {
836 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
837 }
838
839 Handle h_loader(THREAD, loader_oop);
840 Handle h_prot(THREAD, protection_domain);
841
842 jboolean link = !ClassForNameDeferLinking;
843 jclass result = find_class_from_class_loader(env, h_name, init, link, h_loader,
844 h_prot, false, THREAD);
845 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
846 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
847 }
848 return result;
849 JVM_END
850
851 // Currently only called from the old verifier.
852 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
853 jboolean init, jclass from))
854 JVMWrapper("JVM_FindClassFromClass");
855 if (name == NULL) {
856 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
857 }
858 if ((int)strlen(name) > Symbol::max_length()) {
859 // It's impossible to create this class; the name cannot fit
860 // into the constant pool.
861 Exceptions::fthrow(THREAD_AND_LOCATION,
862 vmSymbols::java_lang_NoClassDefFoundError(),
863 "Class name exceeds maximum length of %d: %s",
864 Symbol::max_length(),
865 name);
866 return 0;
867 }
868 TempNewSymbol h_name = SymbolTable::new_symbol(name);
869 oop from_class_oop = JNIHandles::resolve(from);
870 Klass* from_class = (from_class_oop == NULL)
871 ? (Klass*)NULL
872 : java_lang_Class::as_Klass(from_class_oop);
873 oop class_loader = NULL;
874 oop protection_domain = NULL;
875 if (from_class != NULL) {
876 class_loader = from_class->class_loader();
877 protection_domain = from_class->protection_domain();
878 }
879 Handle h_loader(THREAD, class_loader);
880 Handle h_prot (THREAD, protection_domain);
881 jclass result = find_class_from_class_loader(env, h_name, init, false, h_loader,
882 h_prot, true, thread);
883
884 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
885 // this function is generally only used for class loading during verification.
886 ResourceMark rm;
887 oop from_mirror = JNIHandles::resolve_non_null(from);
888 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
889 const char * from_name = from_class->external_name();
890
891 oop mirror = JNIHandles::resolve_non_null(result);
892 Klass* to_class = java_lang_Class::as_Klass(mirror);
893 const char * to = to_class->external_name();
894 log_debug(class, resolve)("%s %s (verification)", from_name, to);
895 }
896
897 return result;
898 JVM_END
899
900 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
901 if (loader.is_null()) {
902 return;
903 }
904
905 // check whether the current caller thread holds the lock or not.
906 // If not, increment the corresponding counter
907 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
908 ObjectSynchronizer::owner_self) {
909 counter->inc();
910 }
911 }
912
913 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
914 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
915 jobject loader, const jbyte *buf,
916 jsize len, jobject pd, const char *source,
917 TRAPS) {
918 if (source == NULL) source = "__JVM_DefineClass__";
919
920 assert(THREAD->is_Java_thread(), "must be a JavaThread");
921 JavaThread* jt = (JavaThread*) THREAD;
922
923 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
924 ClassLoader::perf_define_appclass_selftime(),
925 ClassLoader::perf_define_appclasses(),
926 jt->get_thread_stat()->perf_recursion_counts_addr(),
927 jt->get_thread_stat()->perf_timers_addr(),
928 PerfClassTraceTime::DEFINE_CLASS);
929
930 if (UsePerfData) {
931 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
932 }
933
934 // Since exceptions can be thrown, class initialization can take place
935 // if name is NULL no check for class name in .class stream has to be made.
936 TempNewSymbol class_name = NULL;
937 if (name != NULL) {
938 const int str_len = (int)strlen(name);
939 if (str_len > Symbol::max_length()) {
940 // It's impossible to create this class; the name cannot fit
941 // into the constant pool.
942 Exceptions::fthrow(THREAD_AND_LOCATION,
943 vmSymbols::java_lang_NoClassDefFoundError(),
944 "Class name exceeds maximum length of %d: %s",
945 Symbol::max_length(),
946 name);
947 return 0;
948 }
949 class_name = SymbolTable::new_symbol(name, str_len);
950 }
951
952 ResourceMark rm(THREAD);
953 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
954 Handle class_loader (THREAD, JNIHandles::resolve(loader));
955 if (UsePerfData) {
956 is_lock_held_by_thread(class_loader,
957 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
958 THREAD);
959 }
960 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
961 Klass* k = SystemDictionary::resolve_from_stream(class_name,
962 class_loader,
963 protection_domain,
964 &st,
965 CHECK_NULL);
966
967 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
968 trace_class_resolution(k);
969 }
970
971 return (jclass) JNIHandles::make_local(env, k->java_mirror());
972 }
973
974
975 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
976 JVMWrapper("JVM_DefineClass");
977
978 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
979 JVM_END
980
981
982 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
983 JVMWrapper("JVM_DefineClassWithSource");
984
985 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
986 JVM_END
987
988 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
989 JVMWrapper("JVM_FindLoadedClass");
990 ResourceMark rm(THREAD);
991
992 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
993 char* str = java_lang_String::as_utf8_string(h_name());
994
995 // Sanity check, don't expect null
996 if (str == NULL) return NULL;
997
998 // Internalize the string, converting '.' to '/' in string.
999 char* p = (char*)str;
1000 while (*p != '\0') {
1001 if (*p == '.') {
1002 *p = '/';
1003 }
1004 p++;
1005 }
1006
1007 const int str_len = (int)(p - str);
1008 if (str_len > Symbol::max_length()) {
1009 // It's impossible to create this class; the name cannot fit
1010 // into the constant pool.
1011 return NULL;
1012 }
1013 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1014
1015 // Security Note:
1016 // The Java level wrapper will perform the necessary security check allowing
1017 // us to pass the NULL as the initiating class loader.
1018 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1019 if (UsePerfData) {
1020 is_lock_held_by_thread(h_loader,
1021 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1022 THREAD);
1023 }
1024
1025 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1026 h_loader,
1027 Handle(),
1028 CHECK_NULL);
1029 #if INCLUDE_CDS
1030 if (k == NULL) {
1031 // If the class is not already loaded, try to see if it's in the shared
1032 // archive for the current classloader (h_loader).
1033 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1034 }
1035 #endif
1036 return (k == NULL) ? NULL :
1037 (jclass) JNIHandles::make_local(env, k->java_mirror());
1038 JVM_END
1039
1040 // Module support //////////////////////////////////////////////////////////////////////////////
1041
1042 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1043 jstring location, const char* const* packages, jsize num_packages))
1044 JVMWrapper("JVM_DefineModule");
1045 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1046 JVM_END
1047
1048 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1049 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1050 Modules::set_bootloader_unnamed_module(module, CHECK);
1051 JVM_END
1052
1053 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1054 JVMWrapper("JVM_AddModuleExports");
1055 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1056 JVM_END
1057
1058 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1059 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1060 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1061 JVM_END
1062
1063 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1064 JVMWrapper("JVM_AddModuleExportsToAll");
1065 Modules::add_module_exports(from_module, package, NULL, CHECK);
1066 JVM_END
1067
1068 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1069 JVMWrapper("JVM_AddReadsModule");
1070 Modules::add_reads_module(from_module, source_module, CHECK);
1071 JVM_END
1072
1073 // Reflection support //////////////////////////////////////////////////////////////////////////////
1074
1075 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1076 assert (cls != NULL, "illegal class");
1077 JVMWrapper("JVM_InitClassName");
1078 JvmtiVMObjectAllocEventCollector oam;
1079 ResourceMark rm(THREAD);
1080 HandleMark hm(THREAD);
1081 Handle java_class(THREAD, JNIHandles::resolve(cls));
1082 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1083 return (jstring) JNIHandles::make_local(env, result);
1084 JVM_END
1085
1086
1087 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1088 JVMWrapper("JVM_GetClassInterfaces");
1089 JvmtiVMObjectAllocEventCollector oam;
1090 oop mirror = JNIHandles::resolve_non_null(cls);
1091
1092 // Special handling for primitive objects
1093 if (java_lang_Class::is_primitive(mirror)) {
1094 // Primitive objects does not have any interfaces
1095 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1096 return (jobjectArray) JNIHandles::make_local(env, r);
1097 }
1098
1099 Klass* klass = java_lang_Class::as_Klass(mirror);
1100 // Figure size of result array
1101 int size;
1102 if (klass->is_instance_klass()) {
1103 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1104 } else {
1105 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1106 size = 2;
1107 }
1108
1109 // Allocate result array
1110 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1111 objArrayHandle result (THREAD, r);
1112 // Fill in result
1113 if (klass->is_instance_klass()) {
1114 // Regular instance klass, fill in all local interfaces
1115 for (int index = 0; index < size; index++) {
1116 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1117 result->obj_at_put(index, k->java_mirror());
1118 }
1119 } else {
1120 // All arrays implement java.lang.Cloneable and java.io.Serializable
1121 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1122 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1123 }
1124 return (jobjectArray) JNIHandles::make_local(env, result());
1125 JVM_END
1126
1127
1128 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1129 JVMWrapper("JVM_IsInterface");
1130 oop mirror = JNIHandles::resolve_non_null(cls);
1131 if (java_lang_Class::is_primitive(mirror)) {
1132 return JNI_FALSE;
1133 }
1134 Klass* k = java_lang_Class::as_Klass(mirror);
1135 jboolean result = k->is_interface();
1136 assert(!result || k->is_instance_klass(),
1137 "all interfaces are instance types");
1138 // The compiler intrinsic for isInterface tests the
1139 // Klass::_access_flags bits in the same way.
1140 return result;
1141 JVM_END
1142
1143
1144 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1145 JVMWrapper("JVM_GetClassSigners");
1146 JvmtiVMObjectAllocEventCollector oam;
1147 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1148 // There are no signers for primitive types
1149 return NULL;
1150 }
1151
1152 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1153
1154 // If there are no signers set in the class, or if the class
1155 // is an array, return NULL.
1156 if (signers == NULL) return NULL;
1157
1158 // copy of the signers array
1159 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1160 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1161 for (int index = 0; index < signers->length(); index++) {
1162 signers_copy->obj_at_put(index, signers->obj_at(index));
1163 }
1164
1165 // return the copy
1166 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1167 JVM_END
1168
1169
1170 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1171 JVMWrapper("JVM_SetClassSigners");
1172 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1173 // This call is ignored for primitive types and arrays.
1174 // Signers are only set once, ClassLoader.java, and thus shouldn't
1175 // be called with an array. Only the bootstrap loader creates arrays.
1176 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1177 if (k->is_instance_klass()) {
1178 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1179 }
1180 }
1181 JVM_END
1182
1183
1184 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1185 JVMWrapper("JVM_GetProtectionDomain");
1186 if (JNIHandles::resolve(cls) == NULL) {
1187 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1188 }
1189
1190 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1191 // Primitive types does not have a protection domain.
1192 return NULL;
1193 }
1194
1195 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1196 return (jobject) JNIHandles::make_local(env, pd);
1197 JVM_END
1198
1199
1200 // Returns the inherited_access_control_context field of the running thread.
1201 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1202 JVMWrapper("JVM_GetInheritedAccessControlContext");
1203 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1204 return JNIHandles::make_local(env, result);
1205 JVM_END
1206
1207 class RegisterArrayForGC {
1208 private:
1209 JavaThread *_thread;
1210 public:
1211 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1212 _thread = thread;
1213 _thread->register_array_for_gc(array);
1214 }
1215
1216 ~RegisterArrayForGC() {
1217 _thread->register_array_for_gc(NULL);
1218 }
1219 };
1220
1221
1222 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1223 JVMWrapper("JVM_GetStackAccessControlContext");
1224 if (!UsePrivilegedStack) return NULL;
1225
1226 ResourceMark rm(THREAD);
1227 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1228 JvmtiVMObjectAllocEventCollector oam;
1229
1230 // count the protection domains on the execution stack. We collapse
1231 // duplicate consecutive protection domains into a single one, as
1232 // well as stopping when we hit a privileged frame.
1233
1234 oop previous_protection_domain = NULL;
1235 Handle privileged_context(thread, NULL);
1236 bool is_privileged = false;
1237 oop protection_domain = NULL;
1238
1239 // Iterate through Java frames
1240 vframeStream vfst(thread);
1241 for(; !vfst.at_end(); vfst.next()) {
1242 // get method of frame
1243 Method* method = vfst.method();
1244
1245 // stop at the first privileged frame
1246 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1247 method->name() == vmSymbols::executePrivileged_name())
1248 {
1249 // this frame is privileged
1250 is_privileged = true;
1251
1252 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1253
1254 StackValueCollection* locals = priv->locals();
1255 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1256 StackValue* clr_sv = locals->at(2); // Class<?> caller
1257 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1258 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1259 privileged_context = ctx_sv->get_obj();
1260 Handle caller = clr_sv->get_obj();
1261
1262 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1263 protection_domain = caller_klass->protection_domain();
1264 } else {
1265 protection_domain = method->method_holder()->protection_domain();
1266 }
1267
1268 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1269 local_array->push(protection_domain);
1270 previous_protection_domain = protection_domain;
1271 }
1272
1273 if (is_privileged) break;
1274 }
1275
1276
1277 // either all the domains on the stack were system domains, or
1278 // we had a privileged system domain
1279 if (local_array->is_empty()) {
1280 if (is_privileged && privileged_context.is_null()) return NULL;
1281
1282 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1283 return JNIHandles::make_local(env, result);
1284 }
1285
1286 // the resource area must be registered in case of a gc
1287 RegisterArrayForGC ragc(thread, local_array);
1288 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1289 local_array->length(), CHECK_NULL);
1290 objArrayHandle h_context(thread, context);
1291 for (int index = 0; index < local_array->length(); index++) {
1292 h_context->obj_at_put(index, local_array->at(index));
1293 }
1294
1295 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1296
1297 return JNIHandles::make_local(env, result);
1298 JVM_END
1299
1300
1301 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1302 JVMWrapper("JVM_IsArrayClass");
1303 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1304 return (k != NULL) && k->is_array_klass() ? true : false;
1305 JVM_END
1306
1307
1308 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1309 JVMWrapper("JVM_IsPrimitiveClass");
1310 oop mirror = JNIHandles::resolve_non_null(cls);
1311 return (jboolean) java_lang_Class::is_primitive(mirror);
1312 JVM_END
1313
1314
1315 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1316 JVMWrapper("JVM_GetClassModifiers");
1317 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1318 // Primitive type
1319 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1320 }
1321
1322 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1323 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1324 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1325 return k->modifier_flags();
1326 JVM_END
1327
1328
1329 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1330
1331 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1332 JvmtiVMObjectAllocEventCollector oam;
1333 // ofClass is a reference to a java_lang_Class object. The mirror object
1334 // of an InstanceKlass
1335
1336 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1337 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1338 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1339 return (jobjectArray)JNIHandles::make_local(env, result);
1340 }
1341
1342 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1343 InnerClassesIterator iter(k);
1344
1345 if (iter.length() == 0) {
1346 // Neither an inner nor outer class
1347 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1348 return (jobjectArray)JNIHandles::make_local(env, result);
1349 }
1350
1351 // find inner class info
1352 constantPoolHandle cp(thread, k->constants());
1353 int length = iter.length();
1354
1355 // Allocate temp. result array
1356 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1357 objArrayHandle result (THREAD, r);
1358 int members = 0;
1359
1360 for (; !iter.done(); iter.next()) {
1361 int ioff = iter.inner_class_info_index();
1362 int ooff = iter.outer_class_info_index();
1363
1364 if (ioff != 0 && ooff != 0) {
1365 // Check to see if the name matches the class we're looking for
1366 // before attempting to find the class.
1367 if (cp->klass_name_at_matches(k, ooff)) {
1368 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1369 if (outer_klass == k) {
1370 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1371 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1372
1373 // Throws an exception if outer klass has not declared k as
1374 // an inner klass
1375 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1376
1377 result->obj_at_put(members, inner_klass->java_mirror());
1378 members++;
1379 }
1380 }
1381 }
1382 }
1383
1384 if (members != length) {
1385 // Return array of right length
1386 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1387 for(int i = 0; i < members; i++) {
1388 res->obj_at_put(i, result->obj_at(i));
1389 }
1390 return (jobjectArray)JNIHandles::make_local(env, res);
1391 }
1392
1393 return (jobjectArray)JNIHandles::make_local(env, result());
1394 JVM_END
1395
1396
1397 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1398 {
1399 // ofClass is a reference to a java_lang_Class object.
1400 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1401 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1402 return NULL;
1403 }
1404
1405 bool inner_is_member = false;
1406 Klass* outer_klass
1407 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1408 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1409 if (outer_klass == NULL) return NULL; // already a top-level class
1410 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1411 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1412 }
1413 JVM_END
1414
1415 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1416 {
1417 oop mirror = JNIHandles::resolve_non_null(cls);
1418 if (java_lang_Class::is_primitive(mirror) ||
1419 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1420 return NULL;
1421 }
1422 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1423 int ooff = 0, noff = 0;
1424 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1425 if (noff != 0) {
1426 constantPoolHandle i_cp(thread, k->constants());
1427 Symbol* name = i_cp->symbol_at(noff);
1428 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1429 return (jstring) JNIHandles::make_local(env, str());
1430 }
1431 }
1432 return NULL;
1433 }
1434 JVM_END
1435
1436 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1437 assert (cls != NULL, "illegal class");
1438 JVMWrapper("JVM_GetClassSignature");
1439 JvmtiVMObjectAllocEventCollector oam;
1440 ResourceMark rm(THREAD);
1441 // Return null for arrays and primatives
1442 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1443 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1444 if (k->is_instance_klass()) {
1445 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1446 if (sym == NULL) return NULL;
1447 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1448 return (jstring) JNIHandles::make_local(env, str());
1449 }
1450 }
1451 return NULL;
1452 JVM_END
1453
1454
1455 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1456 assert (cls != NULL, "illegal class");
1457 JVMWrapper("JVM_GetClassAnnotations");
1458
1459 // Return null for arrays and primitives
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 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1464 return (jbyteArray) JNIHandles::make_local(env, a);
1465 }
1466 }
1467 return NULL;
1468 JVM_END
1469
1470
1471 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1472 // some of this code was adapted from from jni_FromReflectedField
1473
1474 oop reflected = JNIHandles::resolve_non_null(field);
1475 oop mirror = java_lang_reflect_Field::clazz(reflected);
1476 Klass* k = java_lang_Class::as_Klass(mirror);
1477 int slot = java_lang_reflect_Field::slot(reflected);
1478 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1479
1480 InstanceKlass* ik = InstanceKlass::cast(k);
1481 intptr_t offset = ik->field_offset(slot);
1482
1483 if (modifiers & JVM_ACC_STATIC) {
1484 // for static fields we only look in the current class
1485 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1486 assert(false, "cannot find static field");
1487 return false;
1488 }
1489 } else {
1490 // for instance fields we start with the current class and work
1491 // our way up through the superclass chain
1492 if (!ik->find_field_from_offset(offset, false, &fd)) {
1493 assert(false, "cannot find instance field");
1494 return false;
1495 }
1496 }
1497 return true;
1498 }
1499
1500 static Method* jvm_get_method_common(jobject method) {
1501 // some of this code was adapted from from jni_FromReflectedMethod
1502
1503 oop reflected = JNIHandles::resolve_non_null(method);
1504 oop mirror = NULL;
1505 int slot = 0;
1506
1507 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1508 mirror = java_lang_reflect_Constructor::clazz(reflected);
1509 slot = java_lang_reflect_Constructor::slot(reflected);
1510 } else {
1511 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1512 "wrong type");
1513 mirror = java_lang_reflect_Method::clazz(reflected);
1514 slot = java_lang_reflect_Method::slot(reflected);
1515 }
1516 Klass* k = java_lang_Class::as_Klass(mirror);
1517
1518 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1519 assert(m != NULL, "cannot find method");
1520 return m; // caller has to deal with NULL in product mode
1521 }
1522
1523 /* Type use annotations support (JDK 1.8) */
1524
1525 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1526 assert (cls != NULL, "illegal class");
1527 JVMWrapper("JVM_GetClassTypeAnnotations");
1528 ResourceMark rm(THREAD);
1529 // Return null for arrays and primitives
1530 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1531 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1532 if (k->is_instance_klass()) {
1533 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1534 if (type_annotations != NULL) {
1535 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1536 return (jbyteArray) JNIHandles::make_local(env, a);
1537 }
1538 }
1539 }
1540 return NULL;
1541 JVM_END
1542
1543 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1544 assert (method != NULL, "illegal method");
1545 JVMWrapper("JVM_GetMethodTypeAnnotations");
1546
1547 // method is a handle to a java.lang.reflect.Method object
1548 Method* m = jvm_get_method_common(method);
1549 if (m == NULL) {
1550 return NULL;
1551 }
1552
1553 AnnotationArray* type_annotations = m->type_annotations();
1554 if (type_annotations != NULL) {
1555 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1556 return (jbyteArray) JNIHandles::make_local(env, a);
1557 }
1558
1559 return NULL;
1560 JVM_END
1561
1562 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1563 assert (field != NULL, "illegal field");
1564 JVMWrapper("JVM_GetFieldTypeAnnotations");
1565
1566 fieldDescriptor fd;
1567 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1568 if (!gotFd) {
1569 return NULL;
1570 }
1571
1572 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1573 JVM_END
1574
1575 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1576 if (!cp->is_within_bounds(index)) {
1577 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1578 }
1579 }
1580
1581 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1582 {
1583 JVMWrapper("JVM_GetMethodParameters");
1584 // method is a handle to a java.lang.reflect.Method object
1585 Method* method_ptr = jvm_get_method_common(method);
1586 methodHandle mh (THREAD, method_ptr);
1587 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1588 const int num_params = mh->method_parameters_length();
1589
1590 if (num_params < 0) {
1591 // A -1 return value from method_parameters_length means there is no
1592 // parameter data. Return null to indicate this to the reflection
1593 // API.
1594 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1595 return (jobjectArray)NULL;
1596 } else {
1597 // Otherwise, we return something up to reflection, even if it is
1598 // a zero-length array. Why? Because in some cases this can
1599 // trigger a MalformedParametersException.
1600
1601 // make sure all the symbols are properly formatted
1602 for (int i = 0; i < num_params; i++) {
1603 MethodParametersElement* params = mh->method_parameters_start();
1604 int index = params[i].name_cp_index;
1605 bounds_check(mh->constants(), index, CHECK_NULL);
1606
1607 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1608 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1609 "Wrong type at constant pool index");
1610 }
1611
1612 }
1613
1614 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1615 objArrayHandle result (THREAD, result_oop);
1616
1617 for (int i = 0; i < num_params; i++) {
1618 MethodParametersElement* params = mh->method_parameters_start();
1619 // For a 0 index, give a NULL symbol
1620 Symbol* sym = 0 != params[i].name_cp_index ?
1621 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1622 int flags = params[i].flags;
1623 oop param = Reflection::new_parameter(reflected_method, i, sym,
1624 flags, CHECK_NULL);
1625 result->obj_at_put(i, param);
1626 }
1627 return (jobjectArray)JNIHandles::make_local(env, result());
1628 }
1629 }
1630 JVM_END
1631
1632 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1633
1634 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1635 {
1636 JVMWrapper("JVM_GetClassDeclaredFields");
1637 JvmtiVMObjectAllocEventCollector oam;
1638
1639 // Exclude primitive types and array types
1640 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1641 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1642 // Return empty array
1643 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1644 return (jobjectArray) JNIHandles::make_local(env, res);
1645 }
1646
1647 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1648 constantPoolHandle cp(THREAD, k->constants());
1649
1650 // Ensure class is linked
1651 k->link_class(CHECK_NULL);
1652
1653 // Allocate result
1654 int num_fields;
1655
1656 if (publicOnly) {
1657 num_fields = 0;
1658 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1659 if (fs.access_flags().is_public()) ++num_fields;
1660 }
1661 } else {
1662 num_fields = k->java_fields_count();
1663 }
1664
1665 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1666 objArrayHandle result (THREAD, r);
1667
1668 int out_idx = 0;
1669 fieldDescriptor fd;
1670 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1671 if (!publicOnly || fs.access_flags().is_public()) {
1672 fd.reinitialize(k, fs.index());
1673 oop field = Reflection::new_field(&fd, CHECK_NULL);
1674 result->obj_at_put(out_idx, field);
1675 ++out_idx;
1676 }
1677 }
1678 assert(out_idx == num_fields, "just checking");
1679 return (jobjectArray) JNIHandles::make_local(env, result());
1680 }
1681 JVM_END
1682
1683 static bool select_method(const methodHandle& method, bool want_constructor) {
1684 if (want_constructor) {
1685 return (method->is_initializer() && !method->is_static());
1686 } else {
1687 return (!method->is_initializer() && !method->is_overpass());
1688 }
1689 }
1690
1691 static jobjectArray get_class_declared_methods_helper(
1692 JNIEnv *env,
1693 jclass ofClass, jboolean publicOnly,
1694 bool want_constructor,
1695 Klass* klass, TRAPS) {
1696
1697 JvmtiVMObjectAllocEventCollector oam;
1698
1699 // Exclude primitive types and array types
1700 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1701 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1702 // Return empty array
1703 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1704 return (jobjectArray) JNIHandles::make_local(env, res);
1705 }
1706
1707 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1708
1709 // Ensure class is linked
1710 k->link_class(CHECK_NULL);
1711
1712 Array<Method*>* methods = k->methods();
1713 int methods_length = methods->length();
1714
1715 // Save original method_idnum in case of redefinition, which can change
1716 // the idnum of obsolete methods. The new method will have the same idnum
1717 // but if we refresh the methods array, the counts will be wrong.
1718 ResourceMark rm(THREAD);
1719 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1720 int num_methods = 0;
1721
1722 for (int i = 0; i < methods_length; i++) {
1723 methodHandle method(THREAD, methods->at(i));
1724 if (select_method(method, want_constructor)) {
1725 if (!publicOnly || method->is_public()) {
1726 idnums->push(method->method_idnum());
1727 ++num_methods;
1728 }
1729 }
1730 }
1731
1732 // Allocate result
1733 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1734 objArrayHandle result (THREAD, r);
1735
1736 // Now just put the methods that we selected above, but go by their idnum
1737 // in case of redefinition. The methods can be redefined at any safepoint,
1738 // so above when allocating the oop array and below when creating reflect
1739 // objects.
1740 for (int i = 0; i < num_methods; i++) {
1741 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1742 if (method.is_null()) {
1743 // Method may have been deleted and seems this API can handle null
1744 // Otherwise should probably put a method that throws NSME
1745 result->obj_at_put(i, NULL);
1746 } else {
1747 oop m;
1748 if (want_constructor) {
1749 m = Reflection::new_constructor(method, CHECK_NULL);
1750 } else {
1751 m = Reflection::new_method(method, false, CHECK_NULL);
1752 }
1753 result->obj_at_put(i, m);
1754 }
1755 }
1756
1757 return (jobjectArray) JNIHandles::make_local(env, result());
1758 }
1759
1760 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1761 {
1762 JVMWrapper("JVM_GetClassDeclaredMethods");
1763 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1764 /*want_constructor*/ false,
1765 SystemDictionary::reflect_Method_klass(), THREAD);
1766 }
1767 JVM_END
1768
1769 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1770 {
1771 JVMWrapper("JVM_GetClassDeclaredConstructors");
1772 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1773 /*want_constructor*/ true,
1774 SystemDictionary::reflect_Constructor_klass(), THREAD);
1775 }
1776 JVM_END
1777
1778 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1779 {
1780 JVMWrapper("JVM_GetClassAccessFlags");
1781 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1782 // Primitive type
1783 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1784 }
1785
1786 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1787 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1788 }
1789 JVM_END
1790
1791 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1792 {
1793 JVMWrapper("JVM_AreNestMates");
1794 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1795 assert(c->is_instance_klass(), "must be");
1796 InstanceKlass* ck = InstanceKlass::cast(c);
1797 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1798 assert(m->is_instance_klass(), "must be");
1799 InstanceKlass* mk = InstanceKlass::cast(m);
1800 return ck->has_nestmate_access_to(mk, THREAD);
1801 }
1802 JVM_END
1803
1804 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1805 {
1806 // current is not a primitive or array class
1807 JVMWrapper("JVM_GetNestHost");
1808 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1809 assert(c->is_instance_klass(), "must be");
1810 InstanceKlass* ck = InstanceKlass::cast(c);
1811 // Don't post exceptions if validation fails
1812 InstanceKlass* host = ck->nest_host(NULL, THREAD);
1813 return (jclass) (host == NULL ? NULL :
1814 JNIHandles::make_local(THREAD, host->java_mirror()));
1815 }
1816 JVM_END
1817
1818 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1819 {
1820 // current is not a primitive or array class
1821 JVMWrapper("JVM_GetNestMembers");
1822 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1823 assert(c->is_instance_klass(), "must be");
1824 InstanceKlass* ck = InstanceKlass::cast(c);
1825 // Get the nest host for this nest - throw ICCE if validation fails
1826 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
1827 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
1828
1829 {
1830 JvmtiVMObjectAllocEventCollector oam;
1831 Array<u2>* members = host->nest_members();
1832 int length = members == NULL ? 0 : members->length();
1833 // nest host is first in the array so make it one bigger
1834 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
1835 length + 1, CHECK_NULL);
1836 objArrayHandle result (THREAD, r);
1837 result->obj_at_put(0, host->java_mirror());
1838 if (length != 0) {
1839 int i;
1840 for (i = 0; i < length; i++) {
1841 int cp_index = members->at(i);
1842 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
1843 if (k->is_instance_klass()) {
1844 InstanceKlass* nest_host_k =
1845 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
1846 if (nest_host_k == host) {
1847 result->obj_at_put(i+1, k->java_mirror());
1848 }
1849 else {
1850 // k's nest host is legal but it isn't our host so
1851 // throw ICCE
1852 ResourceMark rm(THREAD);
1853 Exceptions::fthrow(THREAD_AND_LOCATION,
1854 icce,
1855 "Nest member %s in %s declares a different nest host of %s",
1856 k->external_name(),
1857 host->external_name(),
1858 nest_host_k->external_name()
1859 );
1860 return NULL;
1861 }
1862 }
1863 else {
1864 // we have a bad nest member entry - throw ICCE
1865 ResourceMark rm(THREAD);
1866 Exceptions::fthrow(THREAD_AND_LOCATION,
1867 icce,
1868 "Class %s can not be a nest member of %s",
1869 k->external_name(),
1870 host->external_name()
1871 );
1872 return NULL;
1873 }
1874 }
1875 }
1876 else {
1877 assert(host == ck, "must be singleton nest");
1878 }
1879 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1880 }
1881 }
1882 JVM_END
1883
1884 // Constant pool access //////////////////////////////////////////////////////////
1885
1886 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1887 {
1888 JVMWrapper("JVM_GetClassConstantPool");
1889 JvmtiVMObjectAllocEventCollector oam;
1890
1891 // Return null for primitives and arrays
1892 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1893 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1894 if (k->is_instance_klass()) {
1895 InstanceKlass* k_h = InstanceKlass::cast(k);
1896 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1897 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1898 return JNIHandles::make_local(jcp());
1899 }
1900 }
1901 return NULL;
1902 }
1903 JVM_END
1904
1905
1906 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1907 {
1908 JVMWrapper("JVM_ConstantPoolGetSize");
1909 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1910 return cp->length();
1911 }
1912 JVM_END
1913
1914
1915 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1916 {
1917 JVMWrapper("JVM_ConstantPoolGetClassAt");
1918 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1919 bounds_check(cp, index, CHECK_NULL);
1920 constantTag tag = cp->tag_at(index);
1921 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1922 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1923 }
1924 Klass* k = cp->klass_at(index, CHECK_NULL);
1925 return (jclass) JNIHandles::make_local(k->java_mirror());
1926 }
1927 JVM_END
1928
1929 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1930 {
1931 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1932 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1933 bounds_check(cp, index, CHECK_NULL);
1934 constantTag tag = cp->tag_at(index);
1935 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1936 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1937 }
1938 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1939 if (k == NULL) return NULL;
1940 return (jclass) JNIHandles::make_local(k->java_mirror());
1941 }
1942 JVM_END
1943
1944 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1945 constantTag tag = cp->tag_at(index);
1946 if (!tag.is_method() && !tag.is_interface_method()) {
1947 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1948 }
1949 int klass_ref = cp->uncached_klass_ref_index_at(index);
1950 Klass* k_o;
1951 if (force_resolution) {
1952 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1953 } else {
1954 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1955 if (k_o == NULL) return NULL;
1956 }
1957 InstanceKlass* k = InstanceKlass::cast(k_o);
1958 Symbol* name = cp->uncached_name_ref_at(index);
1959 Symbol* sig = cp->uncached_signature_ref_at(index);
1960 methodHandle m (THREAD, k->find_method(name, sig));
1961 if (m.is_null()) {
1962 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1963 }
1964 oop method;
1965 if (!m->is_initializer() || m->is_static()) {
1966 method = Reflection::new_method(m, true, CHECK_NULL);
1967 } else {
1968 method = Reflection::new_constructor(m, CHECK_NULL);
1969 }
1970 return JNIHandles::make_local(method);
1971 }
1972
1973 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1974 {
1975 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1976 JvmtiVMObjectAllocEventCollector oam;
1977 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1978 bounds_check(cp, index, CHECK_NULL);
1979 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1980 return res;
1981 }
1982 JVM_END
1983
1984 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1985 {
1986 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1987 JvmtiVMObjectAllocEventCollector oam;
1988 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1989 bounds_check(cp, index, CHECK_NULL);
1990 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1991 return res;
1992 }
1993 JVM_END
1994
1995 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1996 constantTag tag = cp->tag_at(index);
1997 if (!tag.is_field()) {
1998 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1999 }
2000 int klass_ref = cp->uncached_klass_ref_index_at(index);
2001 Klass* k_o;
2002 if (force_resolution) {
2003 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2004 } else {
2005 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2006 if (k_o == NULL) return NULL;
2007 }
2008 InstanceKlass* k = InstanceKlass::cast(k_o);
2009 Symbol* name = cp->uncached_name_ref_at(index);
2010 Symbol* sig = cp->uncached_signature_ref_at(index);
2011 fieldDescriptor fd;
2012 Klass* target_klass = k->find_field(name, sig, &fd);
2013 if (target_klass == NULL) {
2014 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2015 }
2016 oop field = Reflection::new_field(&fd, CHECK_NULL);
2017 return JNIHandles::make_local(field);
2018 }
2019
2020 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2021 {
2022 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2023 JvmtiVMObjectAllocEventCollector oam;
2024 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2025 bounds_check(cp, index, CHECK_NULL);
2026 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2027 return res;
2028 }
2029 JVM_END
2030
2031 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2032 {
2033 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2034 JvmtiVMObjectAllocEventCollector oam;
2035 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2036 bounds_check(cp, index, CHECK_NULL);
2037 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2038 return res;
2039 }
2040 JVM_END
2041
2042 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2043 {
2044 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2045 JvmtiVMObjectAllocEventCollector oam;
2046 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2047 bounds_check(cp, index, CHECK_NULL);
2048 constantTag tag = cp->tag_at(index);
2049 if (!tag.is_field_or_method()) {
2050 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2051 }
2052 int klass_ref = cp->uncached_klass_ref_index_at(index);
2053 Symbol* klass_name = cp->klass_name_at(klass_ref);
2054 Symbol* member_name = cp->uncached_name_ref_at(index);
2055 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2056 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2057 objArrayHandle dest(THREAD, dest_o);
2058 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2059 dest->obj_at_put(0, str());
2060 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2061 dest->obj_at_put(1, str());
2062 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2063 dest->obj_at_put(2, str());
2064 return (jobjectArray) JNIHandles::make_local(dest());
2065 }
2066 JVM_END
2067
2068 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2069 {
2070 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2071 JvmtiVMObjectAllocEventCollector oam;
2072 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2073 bounds_check(cp, index, CHECK_0);
2074 constantTag tag = cp->tag_at(index);
2075 if (!tag.is_field_or_method()) {
2076 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2077 }
2078 return (jint) cp->uncached_klass_ref_index_at(index);
2079 }
2080 JVM_END
2081
2082 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2083 {
2084 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2085 JvmtiVMObjectAllocEventCollector oam;
2086 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2087 bounds_check(cp, index, CHECK_0);
2088 constantTag tag = cp->tag_at(index);
2089 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2090 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2091 }
2092 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2093 }
2094 JVM_END
2095
2096 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2097 {
2098 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2099 JvmtiVMObjectAllocEventCollector oam;
2100 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2101 bounds_check(cp, index, CHECK_NULL);
2102 constantTag tag = cp->tag_at(index);
2103 if (!tag.is_name_and_type()) {
2104 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2105 }
2106 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2107 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2108 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2109 objArrayHandle dest(THREAD, dest_o);
2110 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2111 dest->obj_at_put(0, str());
2112 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2113 dest->obj_at_put(1, str());
2114 return (jobjectArray) JNIHandles::make_local(dest());
2115 }
2116 JVM_END
2117
2118 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2119 {
2120 JVMWrapper("JVM_ConstantPoolGetIntAt");
2121 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2122 bounds_check(cp, index, CHECK_0);
2123 constantTag tag = cp->tag_at(index);
2124 if (!tag.is_int()) {
2125 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2126 }
2127 return cp->int_at(index);
2128 }
2129 JVM_END
2130
2131 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2132 {
2133 JVMWrapper("JVM_ConstantPoolGetLongAt");
2134 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2135 bounds_check(cp, index, CHECK_(0L));
2136 constantTag tag = cp->tag_at(index);
2137 if (!tag.is_long()) {
2138 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2139 }
2140 return cp->long_at(index);
2141 }
2142 JVM_END
2143
2144 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2145 {
2146 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2147 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2148 bounds_check(cp, index, CHECK_(0.0f));
2149 constantTag tag = cp->tag_at(index);
2150 if (!tag.is_float()) {
2151 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2152 }
2153 return cp->float_at(index);
2154 }
2155 JVM_END
2156
2157 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2158 {
2159 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2160 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2161 bounds_check(cp, index, CHECK_(0.0));
2162 constantTag tag = cp->tag_at(index);
2163 if (!tag.is_double()) {
2164 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2165 }
2166 return cp->double_at(index);
2167 }
2168 JVM_END
2169
2170 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2171 {
2172 JVMWrapper("JVM_ConstantPoolGetStringAt");
2173 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2174 bounds_check(cp, index, CHECK_NULL);
2175 constantTag tag = cp->tag_at(index);
2176 if (!tag.is_string()) {
2177 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2178 }
2179 oop str = cp->string_at(index, CHECK_NULL);
2180 return (jstring) JNIHandles::make_local(str);
2181 }
2182 JVM_END
2183
2184 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2185 {
2186 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2187 JvmtiVMObjectAllocEventCollector oam;
2188 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2189 bounds_check(cp, index, CHECK_NULL);
2190 constantTag tag = cp->tag_at(index);
2191 if (!tag.is_symbol()) {
2192 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2193 }
2194 Symbol* sym = cp->symbol_at(index);
2195 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2196 return (jstring) JNIHandles::make_local(str());
2197 }
2198 JVM_END
2199
2200 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2201 {
2202 JVMWrapper("JVM_ConstantPoolGetTagAt");
2203 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2204 bounds_check(cp, index, CHECK_0);
2205 constantTag tag = cp->tag_at(index);
2206 jbyte result = tag.value();
2207 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2208 // they are changed to the corresponding tags from the JVM spec, so that java code in
2209 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2210 if (tag.is_klass_or_reference()) {
2211 result = JVM_CONSTANT_Class;
2212 } else if (tag.is_string_index()) {
2213 result = JVM_CONSTANT_String;
2214 } else if (tag.is_method_type_in_error()) {
2215 result = JVM_CONSTANT_MethodType;
2216 } else if (tag.is_method_handle_in_error()) {
2217 result = JVM_CONSTANT_MethodHandle;
2218 } else if (tag.is_dynamic_constant_in_error()) {
2219 result = JVM_CONSTANT_Dynamic;
2220 }
2221 return result;
2222 }
2223 JVM_END
2224
2225 // Assertion support. //////////////////////////////////////////////////////////
2226
2227 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2228 JVMWrapper("JVM_DesiredAssertionStatus");
2229 assert(cls != NULL, "bad class");
2230
2231 oop r = JNIHandles::resolve(cls);
2232 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2233 if (java_lang_Class::is_primitive(r)) return false;
2234
2235 Klass* k = java_lang_Class::as_Klass(r);
2236 assert(k->is_instance_klass(), "must be an instance klass");
2237 if (!k->is_instance_klass()) return false;
2238
2239 ResourceMark rm(THREAD);
2240 const char* name = k->name()->as_C_string();
2241 bool system_class = k->class_loader() == NULL;
2242 return JavaAssertions::enabled(name, system_class);
2243
2244 JVM_END
2245
2246
2247 // Return a new AssertionStatusDirectives object with the fields filled in with
2248 // command-line assertion arguments (i.e., -ea, -da).
2249 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2250 JVMWrapper("JVM_AssertionStatusDirectives");
2251 JvmtiVMObjectAllocEventCollector oam;
2252 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2253 return JNIHandles::make_local(env, asd);
2254 JVM_END
2255
2256 // Verification ////////////////////////////////////////////////////////////////////////////////
2257
2258 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2259
2260 // RedefineClasses support: bug 6214132 caused verification to fail.
2261 // All functions from this section should call the jvmtiThreadSate function:
2262 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2263 // The function returns a Klass* of the _scratch_class if the verifier
2264 // was invoked in the middle of the class redefinition.
2265 // Otherwise it returns its argument value which is the _the_class Klass*.
2266 // Please, refer to the description in the jvmtiThreadSate.hpp.
2267
2268 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2269 JVMWrapper("JVM_GetClassNameUTF");
2270 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2271 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2272 return k->name()->as_utf8();
2273 JVM_END
2274
2275
2276 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2277 JVMWrapper("JVM_GetClassCPTypes");
2278 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2279 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2280 // types will have length zero if this is not an InstanceKlass
2281 // (length is determined by call to JVM_GetClassCPEntriesCount)
2282 if (k->is_instance_klass()) {
2283 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2284 for (int index = cp->length() - 1; index >= 0; index--) {
2285 constantTag tag = cp->tag_at(index);
2286 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2287 }
2288 }
2289 JVM_END
2290
2291
2292 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2293 JVMWrapper("JVM_GetClassCPEntriesCount");
2294 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2295 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2296 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2297 JVM_END
2298
2299
2300 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2301 JVMWrapper("JVM_GetClassFieldsCount");
2302 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2303 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2304 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2305 JVM_END
2306
2307
2308 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2309 JVMWrapper("JVM_GetClassMethodsCount");
2310 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2311 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2312 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2313 JVM_END
2314
2315
2316 // The following methods, used for the verifier, are never called with
2317 // array klasses, so a direct cast to InstanceKlass is safe.
2318 // Typically, these methods are called in a loop with bounds determined
2319 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2320 // zero for arrays.
2321 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2322 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2323 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2324 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2325 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2326 int length = method->checked_exceptions_length();
2327 if (length > 0) {
2328 CheckedExceptionElement* table= method->checked_exceptions_start();
2329 for (int i = 0; i < length; i++) {
2330 exceptions[i] = table[i].class_cp_index;
2331 }
2332 }
2333 JVM_END
2334
2335
2336 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2337 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2338 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2339 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2340 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2341 return method->checked_exceptions_length();
2342 JVM_END
2343
2344
2345 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2346 JVMWrapper("JVM_GetMethodIxByteCode");
2347 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2348 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2349 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2350 memcpy(code, method->code_base(), method->code_size());
2351 JVM_END
2352
2353
2354 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2355 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2356 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2357 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2358 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2359 return method->code_size();
2360 JVM_END
2361
2362
2363 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2364 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2365 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2366 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2367 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2368 ExceptionTable extable(method);
2369 entry->start_pc = extable.start_pc(entry_index);
2370 entry->end_pc = extable.end_pc(entry_index);
2371 entry->handler_pc = extable.handler_pc(entry_index);
2372 entry->catchType = extable.catch_type_index(entry_index);
2373 JVM_END
2374
2375
2376 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2377 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2378 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2379 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2380 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2381 return method->exception_table_length();
2382 JVM_END
2383
2384
2385 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2386 JVMWrapper("JVM_GetMethodIxModifiers");
2387 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2388 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2389 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2390 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2391 JVM_END
2392
2393
2394 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2395 JVMWrapper("JVM_GetFieldIxModifiers");
2396 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2397 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2398 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2399 JVM_END
2400
2401
2402 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2403 JVMWrapper("JVM_GetMethodIxLocalsCount");
2404 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2405 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2406 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2407 return method->max_locals();
2408 JVM_END
2409
2410
2411 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2412 JVMWrapper("JVM_GetMethodIxArgsSize");
2413 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2414 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2415 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2416 return method->size_of_parameters();
2417 JVM_END
2418
2419
2420 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2421 JVMWrapper("JVM_GetMethodIxMaxStack");
2422 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2423 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2424 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2425 return method->verifier_max_stack();
2426 JVM_END
2427
2428
2429 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2430 JVMWrapper("JVM_IsConstructorIx");
2431 ResourceMark rm(THREAD);
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->name() == vmSymbols::object_initializer_name();
2436 JVM_END
2437
2438
2439 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2440 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2441 ResourceMark rm(THREAD);
2442 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2443 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2444 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2445 return method->is_overpass();
2446 JVM_END
2447
2448 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2449 JVMWrapper("JVM_GetMethodIxIxUTF");
2450 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2451 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2452 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2453 return method->name()->as_utf8();
2454 JVM_END
2455
2456
2457 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2458 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2459 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2460 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2461 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2462 return method->signature()->as_utf8();
2463 JVM_END
2464
2465 /**
2466 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2467 * read entries in the constant pool. Since the old verifier always
2468 * works on a copy of the code, it will not see any rewriting that
2469 * may possibly occur in the middle of verification. So it is important
2470 * that nothing it calls tries to use the cpCache instead of the raw
2471 * constant pool, so we must use cp->uncached_x methods when appropriate.
2472 */
2473 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2474 JVMWrapper("JVM_GetCPFieldNameUTF");
2475 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2476 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2477 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2478 switch (cp->tag_at(cp_index).value()) {
2479 case JVM_CONSTANT_Fieldref:
2480 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2481 default:
2482 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2483 }
2484 ShouldNotReachHere();
2485 return NULL;
2486 JVM_END
2487
2488
2489 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2490 JVMWrapper("JVM_GetCPMethodNameUTF");
2491 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2492 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2493 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2494 switch (cp->tag_at(cp_index).value()) {
2495 case JVM_CONSTANT_InterfaceMethodref:
2496 case JVM_CONSTANT_Methodref:
2497 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2498 default:
2499 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2500 }
2501 ShouldNotReachHere();
2502 return NULL;
2503 JVM_END
2504
2505
2506 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2507 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2508 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2509 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2510 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2511 switch (cp->tag_at(cp_index).value()) {
2512 case JVM_CONSTANT_InterfaceMethodref:
2513 case JVM_CONSTANT_Methodref:
2514 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2515 default:
2516 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2517 }
2518 ShouldNotReachHere();
2519 return NULL;
2520 JVM_END
2521
2522
2523 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2524 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2525 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2526 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2527 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2528 switch (cp->tag_at(cp_index).value()) {
2529 case JVM_CONSTANT_Fieldref:
2530 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2531 default:
2532 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2533 }
2534 ShouldNotReachHere();
2535 return NULL;
2536 JVM_END
2537
2538
2539 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2540 JVMWrapper("JVM_GetCPClassNameUTF");
2541 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2542 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2543 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2544 Symbol* classname = cp->klass_name_at(cp_index);
2545 return classname->as_utf8();
2546 JVM_END
2547
2548
2549 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2550 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2551 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2552 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2553 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2554 switch (cp->tag_at(cp_index).value()) {
2555 case JVM_CONSTANT_Fieldref: {
2556 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2557 Symbol* classname = cp->klass_name_at(class_index);
2558 return classname->as_utf8();
2559 }
2560 default:
2561 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2562 }
2563 ShouldNotReachHere();
2564 return NULL;
2565 JVM_END
2566
2567
2568 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2569 JVMWrapper("JVM_GetCPMethodClassNameUTF");
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_Methodref:
2575 case JVM_CONSTANT_InterfaceMethodref: {
2576 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2577 Symbol* classname = cp->klass_name_at(class_index);
2578 return classname->as_utf8();
2579 }
2580 default:
2581 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2582 }
2583 ShouldNotReachHere();
2584 return NULL;
2585 JVM_END
2586
2587
2588 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2589 JVMWrapper("JVM_GetCPFieldModifiers");
2590 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2591 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2592 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2593 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2594 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2595 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2596 switch (cp->tag_at(cp_index).value()) {
2597 case JVM_CONSTANT_Fieldref: {
2598 Symbol* name = cp->uncached_name_ref_at(cp_index);
2599 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2600 InstanceKlass* ik = InstanceKlass::cast(k_called);
2601 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2602 if (fs.name() == name && fs.signature() == signature) {
2603 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2604 }
2605 }
2606 return -1;
2607 }
2608 default:
2609 fatal("JVM_GetCPFieldModifiers: illegal constant");
2610 }
2611 ShouldNotReachHere();
2612 return 0;
2613 JVM_END
2614
2615
2616 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2617 JVMWrapper("JVM_GetCPMethodModifiers");
2618 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2619 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2620 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2621 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2622 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2623 switch (cp->tag_at(cp_index).value()) {
2624 case JVM_CONSTANT_Methodref:
2625 case JVM_CONSTANT_InterfaceMethodref: {
2626 Symbol* name = cp->uncached_name_ref_at(cp_index);
2627 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2628 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2629 int methods_count = methods->length();
2630 for (int i = 0; i < methods_count; i++) {
2631 Method* method = methods->at(i);
2632 if (method->name() == name && method->signature() == signature) {
2633 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2634 }
2635 }
2636 return -1;
2637 }
2638 default:
2639 fatal("JVM_GetCPMethodModifiers: illegal constant");
2640 }
2641 ShouldNotReachHere();
2642 return 0;
2643 JVM_END
2644
2645
2646 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2647
2648 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2649 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2650 JVM_END
2651
2652
2653 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2654 JVMWrapper("JVM_IsSameClassPackage");
2655 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2656 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2657 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2658 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2659 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2660 JVM_END
2661
2662 // Printing support //////////////////////////////////////////////////
2663 extern "C" {
2664
2665 ATTRIBUTE_PRINTF(3, 0)
2666 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2667 // Reject count values that are negative signed values converted to
2668 // unsigned; see bug 4399518, 4417214
2669 if ((intptr_t)count <= 0) return -1;
2670
2671 int result = os::vsnprintf(str, count, fmt, args);
2672 if (result > 0 && (size_t)result >= count) {
2673 result = -1;
2674 }
2675
2676 return result;
2677 }
2678
2679 ATTRIBUTE_PRINTF(3, 4)
2680 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2681 va_list args;
2682 int len;
2683 va_start(args, fmt);
2684 len = jio_vsnprintf(str, count, fmt, args);
2685 va_end(args);
2686 return len;
2687 }
2688
2689 ATTRIBUTE_PRINTF(2, 3)
2690 int jio_fprintf(FILE* f, const char *fmt, ...) {
2691 int len;
2692 va_list args;
2693 va_start(args, fmt);
2694 len = jio_vfprintf(f, fmt, args);
2695 va_end(args);
2696 return len;
2697 }
2698
2699 ATTRIBUTE_PRINTF(2, 0)
2700 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2701 if (Arguments::vfprintf_hook() != NULL) {
2702 return Arguments::vfprintf_hook()(f, fmt, args);
2703 } else {
2704 return vfprintf(f, fmt, args);
2705 }
2706 }
2707
2708 ATTRIBUTE_PRINTF(1, 2)
2709 JNIEXPORT int jio_printf(const char *fmt, ...) {
2710 int len;
2711 va_list args;
2712 va_start(args, fmt);
2713 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2714 va_end(args);
2715 return len;
2716 }
2717
2718 // HotSpot specific jio method
2719 void jio_print(const char* s, size_t len) {
2720 // Try to make this function as atomic as possible.
2721 if (Arguments::vfprintf_hook() != NULL) {
2722 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2723 } else {
2724 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2725 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2726 }
2727 }
2728
2729 } // Extern C
2730
2731 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2732
2733 // In most of the JVM thread support functions we need to access the
2734 // thread through a ThreadsListHandle to prevent it from exiting and
2735 // being reclaimed while we try to operate on it. The exceptions to this
2736 // rule are when operating on the current thread, or if the monitor of
2737 // the target java.lang.Thread is locked at the Java level - in both
2738 // cases the target cannot exit.
2739
2740 static void thread_entry(JavaThread* thread, TRAPS) {
2741 HandleMark hm(THREAD);
2742 Handle obj(THREAD, thread->threadObj());
2743 JavaValue result(T_VOID);
2744 JavaCalls::call_virtual(&result,
2745 obj,
2746 SystemDictionary::Thread_klass(),
2747 vmSymbols::run_method_name(),
2748 vmSymbols::void_method_signature(),
2749 THREAD);
2750 }
2751
2752
2753 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2754 JVMWrapper("JVM_StartThread");
2755 JavaThread *native_thread = NULL;
2756
2757 // We cannot hold the Threads_lock when we throw an exception,
2758 // due to rank ordering issues. Example: we might need to grab the
2759 // Heap_lock while we construct the exception.
2760 bool throw_illegal_thread_state = false;
2761
2762 // We must release the Threads_lock before we can post a jvmti event
2763 // in Thread::start.
2764 {
2765 // Ensure that the C++ Thread and OSThread structures aren't freed before
2766 // we operate.
2767 MutexLocker mu(Threads_lock);
2768
2769 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2770 // re-starting an already started thread, so we should usually find
2771 // that the JavaThread is null. However for a JNI attached thread
2772 // there is a small window between the Thread object being created
2773 // (with its JavaThread set) and the update to its threadStatus, so we
2774 // have to check for this
2775 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2776 throw_illegal_thread_state = true;
2777 } else {
2778 // We could also check the stillborn flag to see if this thread was already stopped, but
2779 // for historical reasons we let the thread detect that itself when it starts running
2780
2781 jlong size =
2782 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2783 // Allocate the C++ Thread structure and create the native thread. The
2784 // stack size retrieved from java is 64-bit signed, but the constructor takes
2785 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2786 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2787 // - Avoid passing negative values which would result in really large stacks.
2788 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2789 size_t sz = size > 0 ? (size_t) size : 0;
2790 native_thread = new JavaThread(&thread_entry, sz);
2791
2792 // At this point it may be possible that no osthread was created for the
2793 // JavaThread due to lack of memory. Check for this situation and throw
2794 // an exception if necessary. Eventually we may want to change this so
2795 // that we only grab the lock if the thread was created successfully -
2796 // then we can also do this check and throw the exception in the
2797 // JavaThread constructor.
2798 if (native_thread->osthread() != NULL) {
2799 // Note: the current thread is not being used within "prepare".
2800 native_thread->prepare(jthread);
2801 }
2802 }
2803 }
2804
2805 if (throw_illegal_thread_state) {
2806 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2807 }
2808
2809 assert(native_thread != NULL, "Starting null thread?");
2810
2811 if (native_thread->osthread() == NULL) {
2812 // No one should hold a reference to the 'native_thread'.
2813 native_thread->smr_delete();
2814 if (JvmtiExport::should_post_resource_exhausted()) {
2815 JvmtiExport::post_resource_exhausted(
2816 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2817 os::native_thread_creation_failed_msg());
2818 }
2819 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2820 os::native_thread_creation_failed_msg());
2821 }
2822
2823 Thread::start(native_thread);
2824
2825 JVM_END
2826
2827
2828 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2829 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2830 // but is thought to be reliable and simple. In the case, where the receiver is the
2831 // same thread as the sender, no VM_Operation is needed.
2832 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2833 JVMWrapper("JVM_StopThread");
2834
2835 // A nested ThreadsListHandle will grab the Threads_lock so create
2836 // tlh before we resolve throwable.
2837 ThreadsListHandle tlh(thread);
2838 oop java_throwable = JNIHandles::resolve(throwable);
2839 if (java_throwable == NULL) {
2840 THROW(vmSymbols::java_lang_NullPointerException());
2841 }
2842 oop java_thread = NULL;
2843 JavaThread* receiver = NULL;
2844 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2845 Events::log_exception(thread,
2846 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2847 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2848
2849 if (is_alive) {
2850 // jthread refers to a live JavaThread.
2851 if (thread == receiver) {
2852 // Exception is getting thrown at self so no VM_Operation needed.
2853 THROW_OOP(java_throwable);
2854 } else {
2855 // Use a VM_Operation to throw the exception.
2856 Thread::send_async_exception(java_thread, java_throwable);
2857 }
2858 } else {
2859 // Either:
2860 // - target thread has not been started before being stopped, or
2861 // - target thread already terminated
2862 // We could read the threadStatus to determine which case it is
2863 // but that is overkill as it doesn't matter. We must set the
2864 // stillborn flag for the first case, and if the thread has already
2865 // exited setting this flag has no effect.
2866 java_lang_Thread::set_stillborn(java_thread);
2867 }
2868 JVM_END
2869
2870
2871 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2872 JVMWrapper("JVM_IsThreadAlive");
2873
2874 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2875 return java_lang_Thread::is_alive(thread_oop);
2876 JVM_END
2877
2878
2879 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2880 JVMWrapper("JVM_SuspendThread");
2881
2882 ThreadsListHandle tlh(thread);
2883 JavaThread* receiver = NULL;
2884 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2885 if (is_alive) {
2886 // jthread refers to a live JavaThread.
2887 {
2888 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2889 if (receiver->is_external_suspend()) {
2890 // Don't allow nested external suspend requests. We can't return
2891 // an error from this interface so just ignore the problem.
2892 return;
2893 }
2894 if (receiver->is_exiting()) { // thread is in the process of exiting
2895 return;
2896 }
2897 receiver->set_external_suspend();
2898 }
2899
2900 // java_suspend() will catch threads in the process of exiting
2901 // and will ignore them.
2902 receiver->java_suspend();
2903
2904 // It would be nice to have the following assertion in all the
2905 // time, but it is possible for a racing resume request to have
2906 // resumed this thread right after we suspended it. Temporarily
2907 // enable this assertion if you are chasing a different kind of
2908 // bug.
2909 //
2910 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2911 // receiver->is_being_ext_suspended(), "thread is not suspended");
2912 }
2913 JVM_END
2914
2915
2916 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2917 JVMWrapper("JVM_ResumeThread");
2918
2919 ThreadsListHandle tlh(thread);
2920 JavaThread* receiver = NULL;
2921 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2922 if (is_alive) {
2923 // jthread refers to a live JavaThread.
2924
2925 // This is the original comment for this Threads_lock grab:
2926 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2927 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2928 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2929 // looks at it.
2930 //
2931 // The above comment dates back to when we had both internal and
2932 // external suspend APIs that shared a common underlying mechanism.
2933 // External suspend is now entirely cooperative and doesn't share
2934 // anything with internal suspend. That said, there are some
2935 // assumptions in the VM that an external resume grabs the
2936 // Threads_lock. We can't drop the Threads_lock grab here until we
2937 // resolve the assumptions that exist elsewhere.
2938 //
2939 MutexLocker ml(Threads_lock);
2940 receiver->java_resume();
2941 }
2942 JVM_END
2943
2944
2945 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2946 JVMWrapper("JVM_SetThreadPriority");
2947
2948 ThreadsListHandle tlh(thread);
2949 oop java_thread = NULL;
2950 JavaThread* receiver = NULL;
2951 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2952 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2953
2954 if (is_alive) {
2955 // jthread refers to a live JavaThread.
2956 Thread::set_priority(receiver, (ThreadPriority)prio);
2957 }
2958 // Implied else: If the JavaThread hasn't started yet, then the
2959 // priority set in the java.lang.Thread object above will be pushed
2960 // down when it does start.
2961 JVM_END
2962
2963
2964 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2965 JVMWrapper("JVM_Yield");
2966 if (os::dont_yield()) return;
2967 HOTSPOT_THREAD_YIELD();
2968 os::naked_yield();
2969 JVM_END
2970
2971 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
2972 assert(event != NULL, "invariant");
2973 assert(event->should_commit(), "invariant");
2974 event->set_time(millis);
2975 event->commit();
2976 }
2977
2978 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2979 JVMWrapper("JVM_Sleep");
2980
2981 if (millis < 0) {
2982 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2983 }
2984
2985 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
2986 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2987 }
2988
2989 // Save current thread state and restore it at the end of this block.
2990 // And set new thread state to SLEEPING.
2991 JavaThreadSleepState jtss(thread);
2992
2993 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2994 EventThreadSleep event;
2995
2996 if (millis == 0) {
2997 os::naked_yield();
2998 } else {
2999 ThreadState old_state = thread->osthread()->get_state();
3000 thread->osthread()->set_state(SLEEPING);
3001 if (!thread->sleep(millis)) { // interrupted
3002 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3003 // us while we were sleeping. We do not overwrite those.
3004 if (!HAS_PENDING_EXCEPTION) {
3005 if (event.should_commit()) {
3006 post_thread_sleep_event(&event, millis);
3007 }
3008 HOTSPOT_THREAD_SLEEP_END(1);
3009
3010 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3011 // to properly restore the thread state. That's likely wrong.
3012 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3013 }
3014 }
3015 thread->osthread()->set_state(old_state);
3016 }
3017 if (event.should_commit()) {
3018 post_thread_sleep_event(&event, millis);
3019 }
3020 HOTSPOT_THREAD_SLEEP_END(0);
3021 JVM_END
3022
3023 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3024 JVMWrapper("JVM_CurrentThread");
3025 oop jthread = thread->threadObj();
3026 assert (thread != NULL, "no current thread!");
3027 return JNIHandles::make_local(env, jthread);
3028 JVM_END
3029
3030 class CountStackFramesTC : public ThreadClosure {
3031 int _count;
3032 bool _suspended;
3033 public:
3034 CountStackFramesTC() : _count(0), _suspended(false) {}
3035 virtual void do_thread(Thread* thread) {
3036 JavaThread* jt = (JavaThread*)thread;
3037 if (!jt->is_external_suspend()) {
3038 // To keep same behavior we fail this operation,
3039 // even if it would work perfectly.
3040 return;
3041 }
3042 _suspended = true;
3043 // Count all java activation, i.e., number of vframes.
3044 for (vframeStream vfst(jt); !vfst.at_end(); vfst.next()) {
3045 // Native frames are not counted.
3046 if (!vfst.method()->is_native()) _count++;
3047 }
3048 }
3049 int count() { return _count; }
3050 int suspended() { return _suspended; }
3051 };
3052
3053 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3054 JVMWrapper("JVM_CountStackFrames");
3055
3056 ThreadsListHandle tlh(thread);
3057 JavaThread* receiver = NULL;
3058 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3059 if (is_alive) {
3060 // jthread refers to a live JavaThread.
3061 CountStackFramesTC csf;
3062 Handshake::execute(&csf, receiver);
3063 if (!csf.suspended()) {
3064 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3065 "this thread is not suspended");
3066 }
3067 return csf.count();
3068 }
3069 // Implied else: if JavaThread is not alive simply return a count of 0.
3070 return 0;
3071 JVM_END
3072
3073
3074 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3075 JVMWrapper("JVM_Interrupt");
3076
3077 ThreadsListHandle tlh(thread);
3078 JavaThread* receiver = NULL;
3079 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3080 if (is_alive) {
3081 // jthread refers to a live JavaThread.
3082 receiver->interrupt();
3083 }
3084 JVM_END
3085
3086
3087 JVM_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3088 JVMWrapper("JVM_IsInterrupted");
3089
3090 ThreadsListHandle tlh(thread);
3091 JavaThread* receiver = NULL;
3092 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3093 if (is_alive) {
3094 // jthread refers to a live JavaThread.
3095 return (jboolean) receiver->is_interrupted(clear_interrupted != 0);
3096 } else {
3097 return JNI_FALSE;
3098 }
3099 JVM_END
3100
3101
3102 // Return true iff the current thread has locked the object passed in
3103
3104 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3105 JVMWrapper("JVM_HoldsLock");
3106 assert(THREAD->is_Java_thread(), "sanity check");
3107 if (obj == NULL) {
3108 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3109 }
3110 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3111 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3112 JVM_END
3113
3114
3115 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3116 JVMWrapper("JVM_DumpAllStacks");
3117 VM_PrintThreads op;
3118 VMThread::execute(&op);
3119 if (JvmtiExport::should_post_data_dump()) {
3120 JvmtiExport::post_data_dump();
3121 }
3122 JVM_END
3123
3124 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3125 JVMWrapper("JVM_SetNativeThreadName");
3126
3127 // We don't use a ThreadsListHandle here because the current thread
3128 // must be alive.
3129 oop java_thread = JNIHandles::resolve_non_null(jthread);
3130 JavaThread* thr = java_lang_Thread::thread(java_thread);
3131 if (thread == thr && !thr->has_attached_via_jni()) {
3132 // Thread naming is only supported for the current thread and
3133 // we don't set the name of an attached thread to avoid stepping
3134 // on other programs.
3135 ResourceMark rm(thread);
3136 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3137 os::set_native_thread_name(thread_name);
3138 }
3139 JVM_END
3140
3141 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3142
3143 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3144 JVMWrapper("JVM_GetClassContext");
3145 ResourceMark rm(THREAD);
3146 JvmtiVMObjectAllocEventCollector oam;
3147 vframeStream vfst(thread);
3148
3149 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3150 // This must only be called from SecurityManager.getClassContext
3151 Method* m = vfst.method();
3152 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3153 m->name() == vmSymbols::getClassContext_name() &&
3154 m->signature() == vmSymbols::void_class_array_signature())) {
3155 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3156 }
3157 }
3158
3159 // Collect method holders
3160 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3161 for (; !vfst.at_end(); vfst.security_next()) {
3162 Method* m = vfst.method();
3163 // Native frames are not returned
3164 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3165 Klass* holder = m->method_holder();
3166 assert(holder->is_klass(), "just checking");
3167 klass_array->append(holder);
3168 }
3169 }
3170
3171 // Create result array of type [Ljava/lang/Class;
3172 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3173 // Fill in mirrors corresponding to method holders
3174 for (int i = 0; i < klass_array->length(); i++) {
3175 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3176 }
3177
3178 return (jobjectArray) JNIHandles::make_local(env, result);
3179 JVM_END
3180
3181
3182 // java.lang.Package ////////////////////////////////////////////////////////////////
3183
3184
3185 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3186 JVMWrapper("JVM_GetSystemPackage");
3187 ResourceMark rm(THREAD);
3188 JvmtiVMObjectAllocEventCollector oam;
3189 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3190 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3191 return (jstring) JNIHandles::make_local(result);
3192 JVM_END
3193
3194
3195 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3196 JVMWrapper("JVM_GetSystemPackages");
3197 JvmtiVMObjectAllocEventCollector oam;
3198 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3199 return (jobjectArray) JNIHandles::make_local(result);
3200 JVM_END
3201
3202
3203 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3204
3205
3206 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3207 JVMWrapper("JVM_GetAndClearReferencePendingList");
3208
3209 MonitorLocker ml(Heap_lock);
3210 oop ref = Universe::reference_pending_list();
3211 if (ref != NULL) {
3212 Universe::set_reference_pending_list(NULL);
3213 }
3214 return JNIHandles::make_local(env, ref);
3215 JVM_END
3216
3217 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3218 JVMWrapper("JVM_HasReferencePendingList");
3219 MonitorLocker ml(Heap_lock);
3220 return Universe::has_reference_pending_list();
3221 JVM_END
3222
3223 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3224 JVMWrapper("JVM_WaitForReferencePendingList");
3225 MonitorLocker ml(Heap_lock);
3226 while (!Universe::has_reference_pending_list()) {
3227 ml.wait();
3228 }
3229 JVM_END
3230
3231
3232 // ObjectInputStream ///////////////////////////////////////////////////////////////
3233
3234 // Return the first user-defined class loader up the execution stack, or null
3235 // if only code from the bootstrap or platform class loader is on the stack.
3236
3237 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3238 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3239 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3240 oop loader = vfst.method()->method_holder()->class_loader();
3241 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3242 return JNIHandles::make_local(env, loader);
3243 }
3244 }
3245 return NULL;
3246 JVM_END
3247
3248
3249 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3250
3251
3252 // resolve array handle and check arguments
3253 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3254 if (arr == NULL) {
3255 THROW_0(vmSymbols::java_lang_NullPointerException());
3256 }
3257 oop a = JNIHandles::resolve_non_null(arr);
3258 if (!a->is_array()) {
3259 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3260 } else if (type_array_only && !a->is_typeArray()) {
3261 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3262 }
3263 return arrayOop(a);
3264 }
3265
3266
3267 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3268 JVMWrapper("JVM_GetArrayLength");
3269 arrayOop a = check_array(env, arr, false, CHECK_0);
3270 return a->length();
3271 JVM_END
3272
3273
3274 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3275 JVMWrapper("JVM_Array_Get");
3276 JvmtiVMObjectAllocEventCollector oam;
3277 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3278 jvalue value;
3279 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3280 oop box = Reflection::box(&value, type, CHECK_NULL);
3281 return JNIHandles::make_local(env, box);
3282 JVM_END
3283
3284
3285 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3286 JVMWrapper("JVM_GetPrimitiveArrayElement");
3287 jvalue value;
3288 value.i = 0; // to initialize value before getting used in CHECK
3289 arrayOop a = check_array(env, arr, true, CHECK_(value));
3290 assert(a->is_typeArray(), "just checking");
3291 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3292 BasicType wide_type = (BasicType) wCode;
3293 if (type != wide_type) {
3294 Reflection::widen(&value, type, wide_type, CHECK_(value));
3295 }
3296 return value;
3297 JVM_END
3298
3299
3300 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3301 JVMWrapper("JVM_SetArrayElement");
3302 arrayOop a = check_array(env, arr, false, CHECK);
3303 oop box = JNIHandles::resolve(val);
3304 jvalue value;
3305 value.i = 0; // to initialize value before getting used in CHECK
3306 BasicType value_type;
3307 if (a->is_objArray()) {
3308 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3309 value_type = Reflection::unbox_for_regular_object(box, &value);
3310 } else {
3311 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3312 }
3313 Reflection::array_set(&value, a, index, value_type, CHECK);
3314 JVM_END
3315
3316
3317 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3318 JVMWrapper("JVM_SetPrimitiveArrayElement");
3319 arrayOop a = check_array(env, arr, true, CHECK);
3320 assert(a->is_typeArray(), "just checking");
3321 BasicType value_type = (BasicType) vCode;
3322 Reflection::array_set(&v, a, index, value_type, CHECK);
3323 JVM_END
3324
3325
3326 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3327 JVMWrapper("JVM_NewArray");
3328 JvmtiVMObjectAllocEventCollector oam;
3329 oop element_mirror = JNIHandles::resolve(eltClass);
3330 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3331 return JNIHandles::make_local(env, result);
3332 JVM_END
3333
3334
3335 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3336 JVMWrapper("JVM_NewMultiArray");
3337 JvmtiVMObjectAllocEventCollector oam;
3338 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3339 oop element_mirror = JNIHandles::resolve(eltClass);
3340 assert(dim_array->is_typeArray(), "just checking");
3341 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3342 return JNIHandles::make_local(env, result);
3343 JVM_END
3344
3345
3346 // Library support ///////////////////////////////////////////////////////////////////////////
3347
3348 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3349 //%note jvm_ct
3350 JVMWrapper("JVM_LoadLibrary");
3351 char ebuf[1024];
3352 void *load_result;
3353 {
3354 ThreadToNativeFromVM ttnfvm(thread);
3355 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3356 }
3357 if (load_result == NULL) {
3358 char msg[1024];
3359 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3360 // Since 'ebuf' may contain a string encoded using
3361 // platform encoding scheme, we need to pass
3362 // Exceptions::unsafe_to_utf8 to the new_exception method
3363 // as the last argument. See bug 6367357.
3364 Handle h_exception =
3365 Exceptions::new_exception(thread,
3366 vmSymbols::java_lang_UnsatisfiedLinkError(),
3367 msg, Exceptions::unsafe_to_utf8);
3368
3369 THROW_HANDLE_0(h_exception);
3370 }
3371 return load_result;
3372 JVM_END
3373
3374
3375 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3376 JVMWrapper("JVM_UnloadLibrary");
3377 os::dll_unload(handle);
3378 JVM_END
3379
3380
3381 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3382 JVMWrapper("JVM_FindLibraryEntry");
3383 return os::dll_lookup(handle, name);
3384 JVM_END
3385
3386
3387 // JNI version ///////////////////////////////////////////////////////////////////////////////
3388
3389 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3390 JVMWrapper("JVM_IsSupportedJNIVersion");
3391 return Threads::is_supported_jni_version_including_1_1(version);
3392 JVM_END
3393
3394
3395 // String support ///////////////////////////////////////////////////////////////////////////
3396
3397 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3398 JVMWrapper("JVM_InternString");
3399 JvmtiVMObjectAllocEventCollector oam;
3400 if (str == NULL) return NULL;
3401 oop string = JNIHandles::resolve_non_null(str);
3402 oop result = StringTable::intern(string, CHECK_NULL);
3403 return (jstring) JNIHandles::make_local(env, result);
3404 JVM_END
3405
3406
3407 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3408
3409 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3410 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3411 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3412 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3413 // nature. JavaThreads will be "in native" when using this API from JDK code.
3414
3415
3416 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3417 VM_Exit::block_if_vm_exited();
3418 JVMWrapper("JVM_RawMonitorCreate");
3419 return new os::PlatformMutex();
3420 }
3421
3422
3423 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3424 VM_Exit::block_if_vm_exited();
3425 JVMWrapper("JVM_RawMonitorDestroy");
3426 delete ((os::PlatformMutex*) mon);
3427 }
3428
3429
3430 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3431 VM_Exit::block_if_vm_exited();
3432 JVMWrapper("JVM_RawMonitorEnter");
3433 ((os::PlatformMutex*) mon)->lock();
3434 return 0;
3435 }
3436
3437
3438 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3439 VM_Exit::block_if_vm_exited();
3440 JVMWrapper("JVM_RawMonitorExit");
3441 ((os::PlatformMutex*) mon)->unlock();
3442 }
3443
3444
3445 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3446
3447 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, jboolean link,
3448 Handle loader, Handle protection_domain,
3449 jboolean throwError, TRAPS) {
3450 // Initialization also implies linking - check for coherent args
3451 assert((init && link) || !init, "incorrect use of init/link arguments");
3452
3453 // Security Note:
3454 // The Java level wrapper will perform the necessary security check allowing
3455 // us to pass the NULL as the initiating class loader. The VM is responsible for
3456 // the checkPackageAccess relative to the initiating class loader via the
3457 // protection_domain. The protection_domain is passed as NULL by the java code
3458 // if there is no security manager in 3-arg Class.forName().
3459 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3460
3461 // Check if we should initialize the class (which implies linking), or just link it
3462 if (init && klass->is_instance_klass()) {
3463 klass->initialize(CHECK_NULL);
3464 } else if (link && klass->is_instance_klass()) {
3465 InstanceKlass::cast(klass)->link_class(CHECK_NULL);
3466 }
3467 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3468 }
3469
3470
3471 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3472
3473 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3474 JVMWrapper("JVM_InvokeMethod");
3475 Handle method_handle;
3476 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3477 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3478 Handle receiver(THREAD, JNIHandles::resolve(obj));
3479 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3480 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3481 jobject res = JNIHandles::make_local(env, result);
3482 if (JvmtiExport::should_post_vm_object_alloc()) {
3483 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3484 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3485 if (java_lang_Class::is_primitive(ret_type)) {
3486 // Only for primitive type vm allocates memory for java object.
3487 // See box() method.
3488 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3489 }
3490 }
3491 return res;
3492 } else {
3493 THROW_0(vmSymbols::java_lang_StackOverflowError());
3494 }
3495 JVM_END
3496
3497
3498 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3499 JVMWrapper("JVM_NewInstanceFromConstructor");
3500 oop constructor_mirror = JNIHandles::resolve(c);
3501 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3502 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3503 jobject res = JNIHandles::make_local(env, result);
3504 if (JvmtiExport::should_post_vm_object_alloc()) {
3505 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3506 }
3507 return res;
3508 JVM_END
3509
3510 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3511
3512 JVM_LEAF(jboolean, JVM_SupportsCX8())
3513 JVMWrapper("JVM_SupportsCX8");
3514 return VM_Version::supports_cx8();
3515 JVM_END
3516
3517 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3518 JVMWrapper("JVM_InitializeFromArchive");
3519 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3520 assert(k->is_klass(), "just checking");
3521 HeapShared::initialize_from_archived_subgraph(k);
3522 JVM_END
3523
3524 // Returns an array of all live Thread objects (VM internal JavaThreads,
3525 // jvmti agent threads, and JNI attaching threads are skipped)
3526 // See CR 6404306 regarding JNI attaching threads
3527 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3528 ResourceMark rm(THREAD);
3529 ThreadsListEnumerator tle(THREAD, false, false);
3530 JvmtiVMObjectAllocEventCollector oam;
3531
3532 int num_threads = tle.num_threads();
3533 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3534 objArrayHandle threads_ah(THREAD, r);
3535
3536 for (int i = 0; i < num_threads; i++) {
3537 Handle h = tle.get_threadObj(i);
3538 threads_ah->obj_at_put(i, h());
3539 }
3540
3541 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3542 JVM_END
3543
3544
3545 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3546 // Return StackTraceElement[][], each element is the stack trace of a thread in
3547 // the corresponding entry in the given threads array
3548 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3549 JVMWrapper("JVM_DumpThreads");
3550 JvmtiVMObjectAllocEventCollector oam;
3551
3552 // Check if threads is null
3553 if (threads == NULL) {
3554 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3555 }
3556
3557 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3558 objArrayHandle ah(THREAD, a);
3559 int num_threads = ah->length();
3560 // check if threads is non-empty array
3561 if (num_threads == 0) {
3562 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3563 }
3564
3565 // check if threads is not an array of objects of Thread class
3566 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3567 if (k != SystemDictionary::Thread_klass()) {
3568 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3569 }
3570
3571 ResourceMark rm(THREAD);
3572
3573 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3574 for (int i = 0; i < num_threads; i++) {
3575 oop thread_obj = ah->obj_at(i);
3576 instanceHandle h(THREAD, (instanceOop) thread_obj);
3577 thread_handle_array->append(h);
3578 }
3579
3580 // The JavaThread references in thread_handle_array are validated
3581 // in VM_ThreadDump::doit().
3582 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3583 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3584
3585 JVM_END
3586
3587 // JVM monitoring and management support
3588 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3589 return Management::get_jmm_interface(version);
3590 JVM_END
3591
3592 // com.sun.tools.attach.VirtualMachine agent properties support
3593 //
3594 // Initialize the agent properties with the properties maintained in the VM
3595 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3596 JVMWrapper("JVM_InitAgentProperties");
3597 ResourceMark rm;
3598
3599 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3600
3601 PUTPROP(props, "sun.java.command", Arguments::java_command());
3602 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3603 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3604 return properties;
3605 JVM_END
3606
3607 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3608 {
3609 JVMWrapper("JVM_GetEnclosingMethodInfo");
3610 JvmtiVMObjectAllocEventCollector oam;
3611
3612 if (ofClass == NULL) {
3613 return NULL;
3614 }
3615 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3616 // Special handling for primitive objects
3617 if (java_lang_Class::is_primitive(mirror())) {
3618 return NULL;
3619 }
3620 Klass* k = java_lang_Class::as_Klass(mirror());
3621 if (!k->is_instance_klass()) {
3622 return NULL;
3623 }
3624 InstanceKlass* ik = InstanceKlass::cast(k);
3625 int encl_method_class_idx = ik->enclosing_method_class_index();
3626 if (encl_method_class_idx == 0) {
3627 return NULL;
3628 }
3629 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3630 objArrayHandle dest(THREAD, dest_o);
3631 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3632 dest->obj_at_put(0, enc_k->java_mirror());
3633 int encl_method_method_idx = ik->enclosing_method_method_index();
3634 if (encl_method_method_idx != 0) {
3635 Symbol* sym = ik->constants()->symbol_at(
3636 extract_low_short_from_int(
3637 ik->constants()->name_and_type_at(encl_method_method_idx)));
3638 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3639 dest->obj_at_put(1, str());
3640 sym = ik->constants()->symbol_at(
3641 extract_high_short_from_int(
3642 ik->constants()->name_and_type_at(encl_method_method_idx)));
3643 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3644 dest->obj_at_put(2, str());
3645 }
3646 return (jobjectArray) JNIHandles::make_local(dest());
3647 }
3648 JVM_END
3649
3650 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3651 {
3652 memset(info, 0, info_size);
3653
3654 info->jvm_version = VM_Version::jvm_version();
3655 info->patch_version = VM_Version::vm_patch_version();
3656
3657 // when we add a new capability in the jvm_version_info struct, we should also
3658 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3659 // counter defined in runtimeService.cpp.
3660 info->is_attach_supported = AttachListener::is_attach_supported();
3661 }
3662 JVM_END
3663
3664 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3665 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3666 ResourceMark rm(THREAD);
3667
3668 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3669 return NULL;
3670 }
3671
3672 char** vm_flags = Arguments::jvm_flags_array();
3673 char** vm_args = Arguments::jvm_args_array();
3674 int num_flags = Arguments::num_jvm_flags();
3675 int num_args = Arguments::num_jvm_args();
3676
3677 InstanceKlass* ik = SystemDictionary::String_klass();
3678 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3679 objArrayHandle result_h(THREAD, r);
3680
3681 int index = 0;
3682 for (int j = 0; j < num_flags; j++, index++) {
3683 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3684 result_h->obj_at_put(index, h());
3685 }
3686 for (int i = 0; i < num_args; i++, index++) {
3687 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3688 result_h->obj_at_put(index, h());
3689 }
3690 return (jobjectArray) JNIHandles::make_local(env, result_h());
3691 JVM_END
3692
3693 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3694 return os::get_signal_number(name);
3695 JVM_END