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(jclass, JVM_GetCallerClass(JNIEnv* env))
721 JVMWrapper("JVM_GetCallerClass");
722
723 // Getting the class of the caller frame.
724 //
725 // The call stack at this point looks something like this:
726 //
727 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
728 // [1] [ @CallerSensitive API.method ]
729 // [.] [ (skipped intermediate frames) ]
730 // [n] [ caller ]
731 vframeStream vfst(thread);
732 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
733 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
734 Method* m = vfst.method();
735 assert(m != NULL, "sanity");
736 switch (n) {
737 case 0:
738 // This must only be called from Reflection.getCallerClass
739 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
740 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
741 }
742 // fall-through
743 case 1:
744 // Frame 0 and 1 must be caller sensitive.
745 if (!m->caller_sensitive()) {
746 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
747 }
748 break;
749 default:
750 if (!m->is_ignored_by_security_stack_walk()) {
751 // We have reached the desired frame; return the holder class.
752 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
753 }
754 break;
755 }
756 }
757 return NULL;
758 JVM_END
759
760
761 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
762 JVMWrapper("JVM_FindPrimitiveClass");
763 oop mirror = NULL;
764 BasicType t = name2type(utf);
765 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
766 mirror = Universe::java_mirror(t);
767 }
768 if (mirror == NULL) {
769 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
770 } else {
771 return (jclass) JNIHandles::make_local(env, mirror);
772 }
773 JVM_END
774
775
776 // Returns a class loaded by the bootstrap class loader; or null
777 // if not found. ClassNotFoundException is not thrown.
778 // FindClassFromBootLoader is exported to the launcher for windows.
779 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
780 const char* name))
781 JVMWrapper("JVM_FindClassFromBootLoader");
782
783 // Java libraries should ensure that name is never null...
784 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
785 // It's impossible to create this class; the name cannot fit
786 // into the constant pool.
787 return NULL;
788 }
789
790 TempNewSymbol h_name = SymbolTable::new_symbol(name);
791 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
792 if (k == NULL) {
793 return NULL;
794 }
795
796 if (log_is_enabled(Debug, class, resolve)) {
797 trace_class_resolution(k);
798 }
799 return (jclass) JNIHandles::make_local(env, k->java_mirror());
800 JVM_END
801
802 // Find a class with this name in this loader, using the caller's protection domain.
803 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
804 jboolean init, jobject loader,
805 jclass caller))
806 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
807 // Java libraries should ensure that name is never null...
808 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
809 // It's impossible to create this class; the name cannot fit
810 // into the constant pool.
811 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
812 }
813
814 TempNewSymbol h_name = SymbolTable::new_symbol(name);
815
816 oop loader_oop = JNIHandles::resolve(loader);
817 oop from_class = JNIHandles::resolve(caller);
818 oop protection_domain = NULL;
819 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
820 // NPE. Put it in another way, the bootstrap class loader has all permission and
821 // thus no checkPackageAccess equivalence in the VM class loader.
822 // The caller is also passed as NULL by the java code if there is no security
823 // manager to avoid the performance cost of getting the calling class.
824 if (from_class != NULL && loader_oop != NULL) {
825 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
826 }
827
828 Handle h_loader(THREAD, loader_oop);
829 Handle h_prot(THREAD, protection_domain);
830 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
831 h_prot, false, THREAD);
832
833 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
834 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
835 }
836 return result;
837 JVM_END
838
839 // Currently only called from the old verifier.
840 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
841 jboolean init, jclass from))
842 JVMWrapper("JVM_FindClassFromClass");
843 if (name == NULL) {
844 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
845 }
846 if ((int)strlen(name) > Symbol::max_length()) {
847 // It's impossible to create this class; the name cannot fit
848 // into the constant pool.
849 Exceptions::fthrow(THREAD_AND_LOCATION,
850 vmSymbols::java_lang_NoClassDefFoundError(),
851 "Class name exceeds maximum length of %d: %s",
852 Symbol::max_length(),
853 name);
854 return 0;
855 }
856 TempNewSymbol h_name = SymbolTable::new_symbol(name);
857 oop from_class_oop = JNIHandles::resolve(from);
858 Klass* from_class = (from_class_oop == NULL)
859 ? (Klass*)NULL
860 : java_lang_Class::as_Klass(from_class_oop);
861 oop class_loader = NULL;
862 oop protection_domain = NULL;
863 if (from_class != NULL) {
864 class_loader = from_class->class_loader();
865 protection_domain = from_class->protection_domain();
866 }
867 Handle h_loader(THREAD, class_loader);
868 Handle h_prot (THREAD, protection_domain);
869 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
870 h_prot, true, thread);
871
872 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
873 // this function is generally only used for class loading during verification.
874 ResourceMark rm;
875 oop from_mirror = JNIHandles::resolve_non_null(from);
876 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
877 const char * from_name = from_class->external_name();
878
879 oop mirror = JNIHandles::resolve_non_null(result);
880 Klass* to_class = java_lang_Class::as_Klass(mirror);
881 const char * to = to_class->external_name();
882 log_debug(class, resolve)("%s %s (verification)", from_name, to);
883 }
884
885 return result;
886 JVM_END
887
888 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
889 if (loader.is_null()) {
890 return;
891 }
892
893 // check whether the current caller thread holds the lock or not.
894 // If not, increment the corresponding counter
895 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
896 ObjectSynchronizer::owner_self) {
897 counter->inc();
898 }
899 }
900
901 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
902 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
903 jobject loader, const jbyte *buf,
904 jsize len, jobject pd, const char *source,
905 TRAPS) {
906 if (source == NULL) source = "__JVM_DefineClass__";
907
908 assert(THREAD->is_Java_thread(), "must be a JavaThread");
909 JavaThread* jt = (JavaThread*) THREAD;
910
911 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
912 ClassLoader::perf_define_appclass_selftime(),
913 ClassLoader::perf_define_appclasses(),
914 jt->get_thread_stat()->perf_recursion_counts_addr(),
915 jt->get_thread_stat()->perf_timers_addr(),
916 PerfClassTraceTime::DEFINE_CLASS);
917
918 if (UsePerfData) {
919 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
920 }
921
922 // Since exceptions can be thrown, class initialization can take place
923 // if name is NULL no check for class name in .class stream has to be made.
924 TempNewSymbol class_name = NULL;
925 if (name != NULL) {
926 const int str_len = (int)strlen(name);
927 if (str_len > Symbol::max_length()) {
928 // It's impossible to create this class; the name cannot fit
929 // into the constant pool.
930 Exceptions::fthrow(THREAD_AND_LOCATION,
931 vmSymbols::java_lang_NoClassDefFoundError(),
932 "Class name exceeds maximum length of %d: %s",
933 Symbol::max_length(),
934 name);
935 return 0;
936 }
937 class_name = SymbolTable::new_symbol(name, str_len);
938 }
939
940 ResourceMark rm(THREAD);
941 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
942 Handle class_loader (THREAD, JNIHandles::resolve(loader));
943 if (UsePerfData) {
944 is_lock_held_by_thread(class_loader,
945 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
946 THREAD);
947 }
948 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
949 Klass* k = SystemDictionary::resolve_from_stream(class_name,
950 class_loader,
951 protection_domain,
952 &st,
953 CHECK_NULL);
954
955 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
956 trace_class_resolution(k);
957 }
958
959 return (jclass) JNIHandles::make_local(env, k->java_mirror());
960 }
961
962
963 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
964 JVMWrapper("JVM_DefineClass");
965
966 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
967 JVM_END
968
969
970 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
971 JVMWrapper("JVM_DefineClassWithSource");
972
973 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
974 JVM_END
975
976 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
977 JVMWrapper("JVM_FindLoadedClass");
978 ResourceMark rm(THREAD);
979
980 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
981 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
982
983 const char* str = java_lang_String::as_utf8_string(string());
984 // Sanity check, don't expect null
985 if (str == NULL) return NULL;
986
987 const int str_len = (int)strlen(str);
988 if (str_len > Symbol::max_length()) {
989 // It's impossible to create this class; the name cannot fit
990 // into the constant pool.
991 return NULL;
992 }
993 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
994
995 // Security Note:
996 // The Java level wrapper will perform the necessary security check allowing
997 // us to pass the NULL as the initiating class loader.
998 Handle h_loader(THREAD, JNIHandles::resolve(loader));
999 if (UsePerfData) {
1000 is_lock_held_by_thread(h_loader,
1001 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1002 THREAD);
1003 }
1004
1005 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1006 h_loader,
1007 Handle(),
1008 CHECK_NULL);
1009 #if INCLUDE_CDS
1010 if (k == NULL) {
1011 // If the class is not already loaded, try to see if it's in the shared
1012 // archive for the current classloader (h_loader).
1013 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1014 }
1015 #endif
1016 return (k == NULL) ? NULL :
1017 (jclass) JNIHandles::make_local(env, k->java_mirror());
1018 JVM_END
1019
1020 // Module support //////////////////////////////////////////////////////////////////////////////
1021
1022 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1023 jstring location, const char* const* packages, jsize num_packages))
1024 JVMWrapper("JVM_DefineModule");
1025 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1026 JVM_END
1027
1028 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1029 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1030 Modules::set_bootloader_unnamed_module(module, CHECK);
1031 JVM_END
1032
1033 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1034 JVMWrapper("JVM_AddModuleExports");
1035 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1036 JVM_END
1037
1038 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1039 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1040 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1041 JVM_END
1042
1043 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1044 JVMWrapper("JVM_AddModuleExportsToAll");
1045 Modules::add_module_exports(from_module, package, NULL, CHECK);
1046 JVM_END
1047
1048 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1049 JVMWrapper("JVM_AddReadsModule");
1050 Modules::add_reads_module(from_module, source_module, CHECK);
1051 JVM_END
1052
1053 // Reflection support //////////////////////////////////////////////////////////////////////////////
1054
1055 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1056 assert (cls != NULL, "illegal class");
1057 JVMWrapper("JVM_InitClassName");
1058 JvmtiVMObjectAllocEventCollector oam;
1059 ResourceMark rm(THREAD);
1060 HandleMark hm(THREAD);
1061 Handle java_class(THREAD, JNIHandles::resolve(cls));
1062 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1063 return (jstring) JNIHandles::make_local(env, result);
1064 JVM_END
1065
1066
1067 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1068 JVMWrapper("JVM_GetClassInterfaces");
1069 JvmtiVMObjectAllocEventCollector oam;
1070 oop mirror = JNIHandles::resolve_non_null(cls);
1071
1072 // Special handling for primitive objects
1073 if (java_lang_Class::is_primitive(mirror)) {
1074 // Primitive objects does not have any interfaces
1075 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1076 return (jobjectArray) JNIHandles::make_local(env, r);
1077 }
1078
1079 Klass* klass = java_lang_Class::as_Klass(mirror);
1080 // Figure size of result array
1081 int size;
1082 if (klass->is_instance_klass()) {
1083 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1084 } else {
1085 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1086 size = 2;
1087 }
1088
1089 // Allocate result array
1090 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1091 objArrayHandle result (THREAD, r);
1092 // Fill in result
1093 if (klass->is_instance_klass()) {
1094 // Regular instance klass, fill in all local interfaces
1095 for (int index = 0; index < size; index++) {
1096 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1097 result->obj_at_put(index, k->java_mirror());
1098 }
1099 } else {
1100 // All arrays implement java.lang.Cloneable and java.io.Serializable
1101 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1102 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1103 }
1104 return (jobjectArray) JNIHandles::make_local(env, result());
1105 JVM_END
1106
1107
1108 JVM_QUICK_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1109 JVMWrapper("JVM_IsInterface");
1110 oop mirror = JNIHandles::resolve_non_null(cls);
1111 if (java_lang_Class::is_primitive(mirror)) {
1112 return JNI_FALSE;
1113 }
1114 Klass* k = java_lang_Class::as_Klass(mirror);
1115 jboolean result = k->is_interface();
1116 assert(!result || k->is_instance_klass(),
1117 "all interfaces are instance types");
1118 // The compiler intrinsic for isInterface tests the
1119 // Klass::_access_flags bits in the same way.
1120 return result;
1121 JVM_END
1122
1123
1124 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1125 JVMWrapper("JVM_GetClassSigners");
1126 JvmtiVMObjectAllocEventCollector oam;
1127 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1128 // There are no signers for primitive types
1129 return NULL;
1130 }
1131
1132 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1133
1134 // If there are no signers set in the class, or if the class
1135 // is an array, return NULL.
1136 if (signers == NULL) return NULL;
1137
1138 // copy of the signers array
1139 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1140 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1141 for (int index = 0; index < signers->length(); index++) {
1142 signers_copy->obj_at_put(index, signers->obj_at(index));
1143 }
1144
1145 // return the copy
1146 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1147 JVM_END
1148
1149
1150 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1151 JVMWrapper("JVM_SetClassSigners");
1152 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1153 // This call is ignored for primitive types and arrays.
1154 // Signers are only set once, ClassLoader.java, and thus shouldn't
1155 // be called with an array. Only the bootstrap loader creates arrays.
1156 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1157 if (k->is_instance_klass()) {
1158 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1159 }
1160 }
1161 JVM_END
1162
1163
1164 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1165 JVMWrapper("JVM_GetProtectionDomain");
1166 if (JNIHandles::resolve(cls) == NULL) {
1167 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1168 }
1169
1170 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1171 // Primitive types does not have a protection domain.
1172 return NULL;
1173 }
1174
1175 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1176 return (jobject) JNIHandles::make_local(env, pd);
1177 JVM_END
1178
1179
1180 // Returns the inherited_access_control_context field of the running thread.
1181 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1182 JVMWrapper("JVM_GetInheritedAccessControlContext");
1183 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1184 return JNIHandles::make_local(env, result);
1185 JVM_END
1186
1187 class RegisterArrayForGC {
1188 private:
1189 JavaThread *_thread;
1190 public:
1191 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1192 _thread = thread;
1193 _thread->register_array_for_gc(array);
1194 }
1195
1196 ~RegisterArrayForGC() {
1197 _thread->register_array_for_gc(NULL);
1198 }
1199 };
1200
1201
1202 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1203 JVMWrapper("JVM_GetStackAccessControlContext");
1204 if (!UsePrivilegedStack) return NULL;
1205
1206 ResourceMark rm(THREAD);
1207 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1208 JvmtiVMObjectAllocEventCollector oam;
1209
1210 // count the protection domains on the execution stack. We collapse
1211 // duplicate consecutive protection domains into a single one, as
1212 // well as stopping when we hit a privileged frame.
1213
1214 oop previous_protection_domain = NULL;
1215 Handle privileged_context(thread, NULL);
1216 bool is_privileged = false;
1217 oop protection_domain = NULL;
1218
1219 // Iterate through Java frames
1220 vframeStream vfst(thread);
1221 for(; !vfst.at_end(); vfst.next()) {
1222 // get method of frame
1223 Method* method = vfst.method();
1224
1225 // stop at the first privileged frame
1226 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1227 method->name() == vmSymbols::executePrivileged_name())
1228 {
1229 // this frame is privileged
1230 is_privileged = true;
1231
1232 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1233
1234 StackValueCollection* locals = priv->locals();
1235 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1236 StackValue* clr_sv = locals->at(2); // Class<?> caller
1237 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1238 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1239 privileged_context = ctx_sv->get_obj();
1240 Handle caller = clr_sv->get_obj();
1241
1242 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1243 protection_domain = caller_klass->protection_domain();
1244 } else {
1245 protection_domain = method->method_holder()->protection_domain();
1246 }
1247
1248 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) {
1249 local_array->push(protection_domain);
1250 previous_protection_domain = protection_domain;
1251 }
1252
1253 if (is_privileged) break;
1254 }
1255
1256
1257 // either all the domains on the stack were system domains, or
1258 // we had a privileged system domain
1259 if (local_array->is_empty()) {
1260 if (is_privileged && privileged_context.is_null()) return NULL;
1261
1262 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1263 return JNIHandles::make_local(env, result);
1264 }
1265
1266 // the resource area must be registered in case of a gc
1267 RegisterArrayForGC ragc(thread, local_array);
1268 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1269 local_array->length(), CHECK_NULL);
1270 objArrayHandle h_context(thread, context);
1271 for (int index = 0; index < local_array->length(); index++) {
1272 h_context->obj_at_put(index, local_array->at(index));
1273 }
1274
1275 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1276
1277 return JNIHandles::make_local(env, result);
1278 JVM_END
1279
1280
1281 JVM_QUICK_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1282 JVMWrapper("JVM_IsArrayClass");
1283 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1284 return (k != NULL) && k->is_array_klass() ? true : false;
1285 JVM_END
1286
1287
1288 JVM_QUICK_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1289 JVMWrapper("JVM_IsPrimitiveClass");
1290 oop mirror = JNIHandles::resolve_non_null(cls);
1291 return (jboolean) java_lang_Class::is_primitive(mirror);
1292 JVM_END
1293
1294
1295 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1296 JVMWrapper("JVM_GetClassModifiers");
1297 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1298 // Primitive type
1299 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1300 }
1301
1302 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1303 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1304 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1305 return k->modifier_flags();
1306 JVM_END
1307
1308
1309 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1310
1311 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1312 JvmtiVMObjectAllocEventCollector oam;
1313 // ofClass is a reference to a java_lang_Class object. The mirror object
1314 // of an InstanceKlass
1315
1316 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1317 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1318 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1319 return (jobjectArray)JNIHandles::make_local(env, result);
1320 }
1321
1322 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1323 InnerClassesIterator iter(k);
1324
1325 if (iter.length() == 0) {
1326 // Neither an inner nor outer class
1327 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1328 return (jobjectArray)JNIHandles::make_local(env, result);
1329 }
1330
1331 // find inner class info
1332 constantPoolHandle cp(thread, k->constants());
1333 int length = iter.length();
1334
1335 // Allocate temp. result array
1336 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1337 objArrayHandle result (THREAD, r);
1338 int members = 0;
1339
1340 for (; !iter.done(); iter.next()) {
1341 int ioff = iter.inner_class_info_index();
1342 int ooff = iter.outer_class_info_index();
1343
1344 if (ioff != 0 && ooff != 0) {
1345 // Check to see if the name matches the class we're looking for
1346 // before attempting to find the class.
1347 if (cp->klass_name_at_matches(k, ooff)) {
1348 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1349 if (outer_klass == k) {
1350 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1351 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1352
1353 // Throws an exception if outer klass has not declared k as
1354 // an inner klass
1355 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1356
1357 result->obj_at_put(members, inner_klass->java_mirror());
1358 members++;
1359 }
1360 }
1361 }
1362 }
1363
1364 if (members != length) {
1365 // Return array of right length
1366 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1367 for(int i = 0; i < members; i++) {
1368 res->obj_at_put(i, result->obj_at(i));
1369 }
1370 return (jobjectArray)JNIHandles::make_local(env, res);
1371 }
1372
1373 return (jobjectArray)JNIHandles::make_local(env, result());
1374 JVM_END
1375
1376
1377 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1378 {
1379 // ofClass is a reference to a java_lang_Class object.
1380 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1381 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1382 return NULL;
1383 }
1384
1385 bool inner_is_member = false;
1386 Klass* outer_klass
1387 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1388 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1389 if (outer_klass == NULL) return NULL; // already a top-level class
1390 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1391 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1392 }
1393 JVM_END
1394
1395 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1396 {
1397 oop mirror = JNIHandles::resolve_non_null(cls);
1398 if (java_lang_Class::is_primitive(mirror) ||
1399 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1400 return NULL;
1401 }
1402 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1403 int ooff = 0, noff = 0;
1404 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1405 if (noff != 0) {
1406 constantPoolHandle i_cp(thread, k->constants());
1407 Symbol* name = i_cp->symbol_at(noff);
1408 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1409 return (jstring) JNIHandles::make_local(env, str());
1410 }
1411 }
1412 return NULL;
1413 }
1414 JVM_END
1415
1416 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1417 assert (cls != NULL, "illegal class");
1418 JVMWrapper("JVM_GetClassSignature");
1419 JvmtiVMObjectAllocEventCollector oam;
1420 ResourceMark rm(THREAD);
1421 // Return null for arrays and primatives
1422 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1423 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1424 if (k->is_instance_klass()) {
1425 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1426 if (sym == NULL) return NULL;
1427 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1428 return (jstring) JNIHandles::make_local(env, str());
1429 }
1430 }
1431 return NULL;
1432 JVM_END
1433
1434
1435 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1436 assert (cls != NULL, "illegal class");
1437 JVMWrapper("JVM_GetClassAnnotations");
1438
1439 // Return null for arrays and primitives
1440 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1441 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1442 if (k->is_instance_klass()) {
1443 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1444 return (jbyteArray) JNIHandles::make_local(env, a);
1445 }
1446 }
1447 return NULL;
1448 JVM_END
1449
1450
1451 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1452 // some of this code was adapted from from jni_FromReflectedField
1453
1454 oop reflected = JNIHandles::resolve_non_null(field);
1455 oop mirror = java_lang_reflect_Field::clazz(reflected);
1456 Klass* k = java_lang_Class::as_Klass(mirror);
1457 int slot = java_lang_reflect_Field::slot(reflected);
1458 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1459
1460 InstanceKlass* ik = InstanceKlass::cast(k);
1461 intptr_t offset = ik->field_offset(slot);
1462
1463 if (modifiers & JVM_ACC_STATIC) {
1464 // for static fields we only look in the current class
1465 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1466 assert(false, "cannot find static field");
1467 return false;
1468 }
1469 } else {
1470 // for instance fields we start with the current class and work
1471 // our way up through the superclass chain
1472 if (!ik->find_field_from_offset(offset, false, &fd)) {
1473 assert(false, "cannot find instance field");
1474 return false;
1475 }
1476 }
1477 return true;
1478 }
1479
1480 static Method* jvm_get_method_common(jobject method) {
1481 // some of this code was adapted from from jni_FromReflectedMethod
1482
1483 oop reflected = JNIHandles::resolve_non_null(method);
1484 oop mirror = NULL;
1485 int slot = 0;
1486
1487 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1488 mirror = java_lang_reflect_Constructor::clazz(reflected);
1489 slot = java_lang_reflect_Constructor::slot(reflected);
1490 } else {
1491 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1492 "wrong type");
1493 mirror = java_lang_reflect_Method::clazz(reflected);
1494 slot = java_lang_reflect_Method::slot(reflected);
1495 }
1496 Klass* k = java_lang_Class::as_Klass(mirror);
1497
1498 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1499 assert(m != NULL, "cannot find method");
1500 return m; // caller has to deal with NULL in product mode
1501 }
1502
1503 /* Type use annotations support (JDK 1.8) */
1504
1505 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1506 assert (cls != NULL, "illegal class");
1507 JVMWrapper("JVM_GetClassTypeAnnotations");
1508 ResourceMark rm(THREAD);
1509 // Return null for arrays and primitives
1510 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1511 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1512 if (k->is_instance_klass()) {
1513 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1514 if (type_annotations != NULL) {
1515 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1516 return (jbyteArray) JNIHandles::make_local(env, a);
1517 }
1518 }
1519 }
1520 return NULL;
1521 JVM_END
1522
1523 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1524 assert (method != NULL, "illegal method");
1525 JVMWrapper("JVM_GetMethodTypeAnnotations");
1526
1527 // method is a handle to a java.lang.reflect.Method object
1528 Method* m = jvm_get_method_common(method);
1529 if (m == NULL) {
1530 return NULL;
1531 }
1532
1533 AnnotationArray* type_annotations = m->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 return NULL;
1540 JVM_END
1541
1542 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1543 assert (field != NULL, "illegal field");
1544 JVMWrapper("JVM_GetFieldTypeAnnotations");
1545
1546 fieldDescriptor fd;
1547 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1548 if (!gotFd) {
1549 return NULL;
1550 }
1551
1552 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1553 JVM_END
1554
1555 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1556 if (!cp->is_within_bounds(index)) {
1557 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1558 }
1559 }
1560
1561 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1562 {
1563 JVMWrapper("JVM_GetMethodParameters");
1564 // method is a handle to a java.lang.reflect.Method object
1565 Method* method_ptr = jvm_get_method_common(method);
1566 methodHandle mh (THREAD, method_ptr);
1567 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1568 const int num_params = mh->method_parameters_length();
1569
1570 if (num_params < 0) {
1571 // A -1 return value from method_parameters_length means there is no
1572 // parameter data. Return null to indicate this to the reflection
1573 // API.
1574 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1575 return (jobjectArray)NULL;
1576 } else {
1577 // Otherwise, we return something up to reflection, even if it is
1578 // a zero-length array. Why? Because in some cases this can
1579 // trigger a MalformedParametersException.
1580
1581 // make sure all the symbols are properly formatted
1582 for (int i = 0; i < num_params; i++) {
1583 MethodParametersElement* params = mh->method_parameters_start();
1584 int index = params[i].name_cp_index;
1585 bounds_check(mh->constants(), index, CHECK_NULL);
1586
1587 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1588 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1589 "Wrong type at constant pool index");
1590 }
1591
1592 }
1593
1594 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1595 objArrayHandle result (THREAD, result_oop);
1596
1597 for (int i = 0; i < num_params; i++) {
1598 MethodParametersElement* params = mh->method_parameters_start();
1599 // For a 0 index, give a NULL symbol
1600 Symbol* sym = 0 != params[i].name_cp_index ?
1601 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1602 int flags = params[i].flags;
1603 oop param = Reflection::new_parameter(reflected_method, i, sym,
1604 flags, CHECK_NULL);
1605 result->obj_at_put(i, param);
1606 }
1607 return (jobjectArray)JNIHandles::make_local(env, result());
1608 }
1609 }
1610 JVM_END
1611
1612 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1613
1614 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1615 {
1616 JVMWrapper("JVM_GetClassDeclaredFields");
1617 JvmtiVMObjectAllocEventCollector oam;
1618
1619 // Exclude primitive types and array types
1620 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1621 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1622 // Return empty array
1623 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1624 return (jobjectArray) JNIHandles::make_local(env, res);
1625 }
1626
1627 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1628 constantPoolHandle cp(THREAD, k->constants());
1629
1630 // Ensure class is linked
1631 k->link_class(CHECK_NULL);
1632
1633 // Allocate result
1634 int num_fields;
1635
1636 if (publicOnly) {
1637 num_fields = 0;
1638 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1639 if (fs.access_flags().is_public()) ++num_fields;
1640 }
1641 } else {
1642 num_fields = k->java_fields_count();
1643 }
1644
1645 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1646 objArrayHandle result (THREAD, r);
1647
1648 int out_idx = 0;
1649 fieldDescriptor fd;
1650 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1651 if (!publicOnly || fs.access_flags().is_public()) {
1652 fd.reinitialize(k, fs.index());
1653 oop field = Reflection::new_field(&fd, CHECK_NULL);
1654 result->obj_at_put(out_idx, field);
1655 ++out_idx;
1656 }
1657 }
1658 assert(out_idx == num_fields, "just checking");
1659 return (jobjectArray) JNIHandles::make_local(env, result());
1660 }
1661 JVM_END
1662
1663 static bool select_method(const methodHandle& method, bool want_constructor) {
1664 if (want_constructor) {
1665 return (method->is_initializer() && !method->is_static());
1666 } else {
1667 return (!method->is_initializer() && !method->is_overpass());
1668 }
1669 }
1670
1671 static jobjectArray get_class_declared_methods_helper(
1672 JNIEnv *env,
1673 jclass ofClass, jboolean publicOnly,
1674 bool want_constructor,
1675 Klass* klass, TRAPS) {
1676
1677 JvmtiVMObjectAllocEventCollector oam;
1678
1679 // Exclude primitive types and array types
1680 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1681 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1682 // Return empty array
1683 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1684 return (jobjectArray) JNIHandles::make_local(env, res);
1685 }
1686
1687 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1688
1689 // Ensure class is linked
1690 k->link_class(CHECK_NULL);
1691
1692 Array<Method*>* methods = k->methods();
1693 int methods_length = methods->length();
1694
1695 // Save original method_idnum in case of redefinition, which can change
1696 // the idnum of obsolete methods. The new method will have the same idnum
1697 // but if we refresh the methods array, the counts will be wrong.
1698 ResourceMark rm(THREAD);
1699 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1700 int num_methods = 0;
1701
1702 for (int i = 0; i < methods_length; i++) {
1703 methodHandle method(THREAD, methods->at(i));
1704 if (select_method(method, want_constructor)) {
1705 if (!publicOnly || method->is_public()) {
1706 idnums->push(method->method_idnum());
1707 ++num_methods;
1708 }
1709 }
1710 }
1711
1712 // Allocate result
1713 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1714 objArrayHandle result (THREAD, r);
1715
1716 // Now just put the methods that we selected above, but go by their idnum
1717 // in case of redefinition. The methods can be redefined at any safepoint,
1718 // so above when allocating the oop array and below when creating reflect
1719 // objects.
1720 for (int i = 0; i < num_methods; i++) {
1721 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1722 if (method.is_null()) {
1723 // Method may have been deleted and seems this API can handle null
1724 // Otherwise should probably put a method that throws NSME
1725 result->obj_at_put(i, NULL);
1726 } else {
1727 oop m;
1728 if (want_constructor) {
1729 m = Reflection::new_constructor(method, CHECK_NULL);
1730 } else {
1731 m = Reflection::new_method(method, false, CHECK_NULL);
1732 }
1733 result->obj_at_put(i, m);
1734 }
1735 }
1736
1737 return (jobjectArray) JNIHandles::make_local(env, result());
1738 }
1739
1740 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1741 {
1742 JVMWrapper("JVM_GetClassDeclaredMethods");
1743 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1744 /*want_constructor*/ false,
1745 SystemDictionary::reflect_Method_klass(), THREAD);
1746 }
1747 JVM_END
1748
1749 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1750 {
1751 JVMWrapper("JVM_GetClassDeclaredConstructors");
1752 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1753 /*want_constructor*/ true,
1754 SystemDictionary::reflect_Constructor_klass(), THREAD);
1755 }
1756 JVM_END
1757
1758 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1759 {
1760 JVMWrapper("JVM_GetClassAccessFlags");
1761 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1762 // Primitive type
1763 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1764 }
1765
1766 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1767 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1768 }
1769 JVM_END
1770
1771 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1772 {
1773 JVMWrapper("JVM_AreNestMates");
1774 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1775 assert(c->is_instance_klass(), "must be");
1776 InstanceKlass* ck = InstanceKlass::cast(c);
1777 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1778 assert(m->is_instance_klass(), "must be");
1779 InstanceKlass* mk = InstanceKlass::cast(m);
1780 return ck->has_nestmate_access_to(mk, THREAD);
1781 }
1782 JVM_END
1783
1784 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1785 {
1786 // current is not a primitive or array class
1787 JVMWrapper("JVM_GetNestHost");
1788 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1789 assert(c->is_instance_klass(), "must be");
1790 InstanceKlass* ck = InstanceKlass::cast(c);
1791 // Don't post exceptions if validation fails
1792 InstanceKlass* host = ck->nest_host(NULL, THREAD);
1793 return (jclass) (host == NULL ? NULL :
1794 JNIHandles::make_local(THREAD, host->java_mirror()));
1795 }
1796 JVM_END
1797
1798 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1799 {
1800 // current is not a primitive or array class
1801 JVMWrapper("JVM_GetNestMembers");
1802 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1803 assert(c->is_instance_klass(), "must be");
1804 InstanceKlass* ck = InstanceKlass::cast(c);
1805 // Get the nest host for this nest - throw ICCE if validation fails
1806 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
1807 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
1808
1809 {
1810 JvmtiVMObjectAllocEventCollector oam;
1811 Array<u2>* members = host->nest_members();
1812 int length = members == NULL ? 0 : members->length();
1813 // nest host is first in the array so make it one bigger
1814 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
1815 length + 1, CHECK_NULL);
1816 objArrayHandle result (THREAD, r);
1817 result->obj_at_put(0, host->java_mirror());
1818 if (length != 0) {
1819 int i;
1820 for (i = 0; i < length; i++) {
1821 int cp_index = members->at(i);
1822 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
1823 if (k->is_instance_klass()) {
1824 InstanceKlass* nest_host_k =
1825 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
1826 if (nest_host_k == host) {
1827 result->obj_at_put(i+1, k->java_mirror());
1828 }
1829 else {
1830 // k's nest host is legal but it isn't our host so
1831 // throw ICCE
1832 ResourceMark rm(THREAD);
1833 Exceptions::fthrow(THREAD_AND_LOCATION,
1834 icce,
1835 "Nest member %s in %s declares a different nest host of %s",
1836 k->external_name(),
1837 host->external_name(),
1838 nest_host_k->external_name()
1839 );
1840 return NULL;
1841 }
1842 }
1843 else {
1844 // we have a bad nest member entry - throw ICCE
1845 ResourceMark rm(THREAD);
1846 Exceptions::fthrow(THREAD_AND_LOCATION,
1847 icce,
1848 "Class %s can not be a nest member of %s",
1849 k->external_name(),
1850 host->external_name()
1851 );
1852 return NULL;
1853 }
1854 }
1855 }
1856 else {
1857 assert(host == ck, "must be singleton nest");
1858 }
1859 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1860 }
1861 }
1862 JVM_END
1863
1864 // Constant pool access //////////////////////////////////////////////////////////
1865
1866 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1867 {
1868 JVMWrapper("JVM_GetClassConstantPool");
1869 JvmtiVMObjectAllocEventCollector oam;
1870
1871 // Return null for primitives and arrays
1872 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1873 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1874 if (k->is_instance_klass()) {
1875 InstanceKlass* k_h = InstanceKlass::cast(k);
1876 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1877 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1878 return JNIHandles::make_local(jcp());
1879 }
1880 }
1881 return NULL;
1882 }
1883 JVM_END
1884
1885
1886 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1887 {
1888 JVMWrapper("JVM_ConstantPoolGetSize");
1889 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1890 return cp->length();
1891 }
1892 JVM_END
1893
1894
1895 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1896 {
1897 JVMWrapper("JVM_ConstantPoolGetClassAt");
1898 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1899 bounds_check(cp, index, CHECK_NULL);
1900 constantTag tag = cp->tag_at(index);
1901 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1902 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1903 }
1904 Klass* k = cp->klass_at(index, CHECK_NULL);
1905 return (jclass) JNIHandles::make_local(k->java_mirror());
1906 }
1907 JVM_END
1908
1909 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1910 {
1911 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1912 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1913 bounds_check(cp, index, CHECK_NULL);
1914 constantTag tag = cp->tag_at(index);
1915 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1916 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1917 }
1918 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1919 if (k == NULL) return NULL;
1920 return (jclass) JNIHandles::make_local(k->java_mirror());
1921 }
1922 JVM_END
1923
1924 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1925 constantTag tag = cp->tag_at(index);
1926 if (!tag.is_method() && !tag.is_interface_method()) {
1927 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1928 }
1929 int klass_ref = cp->uncached_klass_ref_index_at(index);
1930 Klass* k_o;
1931 if (force_resolution) {
1932 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1933 } else {
1934 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1935 if (k_o == NULL) return NULL;
1936 }
1937 InstanceKlass* k = InstanceKlass::cast(k_o);
1938 Symbol* name = cp->uncached_name_ref_at(index);
1939 Symbol* sig = cp->uncached_signature_ref_at(index);
1940 methodHandle m (THREAD, k->find_method(name, sig));
1941 if (m.is_null()) {
1942 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1943 }
1944 oop method;
1945 if (!m->is_initializer() || m->is_static()) {
1946 method = Reflection::new_method(m, true, CHECK_NULL);
1947 } else {
1948 method = Reflection::new_constructor(m, CHECK_NULL);
1949 }
1950 return JNIHandles::make_local(method);
1951 }
1952
1953 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1954 {
1955 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1956 JvmtiVMObjectAllocEventCollector oam;
1957 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1958 bounds_check(cp, index, CHECK_NULL);
1959 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1960 return res;
1961 }
1962 JVM_END
1963
1964 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1965 {
1966 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1967 JvmtiVMObjectAllocEventCollector oam;
1968 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1969 bounds_check(cp, index, CHECK_NULL);
1970 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1971 return res;
1972 }
1973 JVM_END
1974
1975 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1976 constantTag tag = cp->tag_at(index);
1977 if (!tag.is_field()) {
1978 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1979 }
1980 int klass_ref = cp->uncached_klass_ref_index_at(index);
1981 Klass* k_o;
1982 if (force_resolution) {
1983 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1984 } else {
1985 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1986 if (k_o == NULL) return NULL;
1987 }
1988 InstanceKlass* k = InstanceKlass::cast(k_o);
1989 Symbol* name = cp->uncached_name_ref_at(index);
1990 Symbol* sig = cp->uncached_signature_ref_at(index);
1991 fieldDescriptor fd;
1992 Klass* target_klass = k->find_field(name, sig, &fd);
1993 if (target_klass == NULL) {
1994 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
1995 }
1996 oop field = Reflection::new_field(&fd, CHECK_NULL);
1997 return JNIHandles::make_local(field);
1998 }
1999
2000 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2001 {
2002 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2003 JvmtiVMObjectAllocEventCollector oam;
2004 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2005 bounds_check(cp, index, CHECK_NULL);
2006 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2007 return res;
2008 }
2009 JVM_END
2010
2011 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2012 {
2013 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2014 JvmtiVMObjectAllocEventCollector oam;
2015 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2016 bounds_check(cp, index, CHECK_NULL);
2017 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2018 return res;
2019 }
2020 JVM_END
2021
2022 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2023 {
2024 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2025 JvmtiVMObjectAllocEventCollector oam;
2026 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2027 bounds_check(cp, index, CHECK_NULL);
2028 constantTag tag = cp->tag_at(index);
2029 if (!tag.is_field_or_method()) {
2030 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2031 }
2032 int klass_ref = cp->uncached_klass_ref_index_at(index);
2033 Symbol* klass_name = cp->klass_name_at(klass_ref);
2034 Symbol* member_name = cp->uncached_name_ref_at(index);
2035 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2036 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2037 objArrayHandle dest(THREAD, dest_o);
2038 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2039 dest->obj_at_put(0, str());
2040 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2041 dest->obj_at_put(1, str());
2042 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2043 dest->obj_at_put(2, str());
2044 return (jobjectArray) JNIHandles::make_local(dest());
2045 }
2046 JVM_END
2047
2048 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2049 {
2050 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2051 JvmtiVMObjectAllocEventCollector oam;
2052 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2053 bounds_check(cp, index, CHECK_0);
2054 constantTag tag = cp->tag_at(index);
2055 if (!tag.is_field_or_method()) {
2056 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2057 }
2058 return (jint) cp->uncached_klass_ref_index_at(index);
2059 }
2060 JVM_END
2061
2062 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2063 {
2064 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2065 JvmtiVMObjectAllocEventCollector oam;
2066 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2067 bounds_check(cp, index, CHECK_0);
2068 constantTag tag = cp->tag_at(index);
2069 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2070 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2071 }
2072 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2073 }
2074 JVM_END
2075
2076 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2077 {
2078 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2079 JvmtiVMObjectAllocEventCollector oam;
2080 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2081 bounds_check(cp, index, CHECK_NULL);
2082 constantTag tag = cp->tag_at(index);
2083 if (!tag.is_name_and_type()) {
2084 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2085 }
2086 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2087 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2088 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2089 objArrayHandle dest(THREAD, dest_o);
2090 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2091 dest->obj_at_put(0, str());
2092 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2093 dest->obj_at_put(1, str());
2094 return (jobjectArray) JNIHandles::make_local(dest());
2095 }
2096 JVM_END
2097
2098 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2099 {
2100 JVMWrapper("JVM_ConstantPoolGetIntAt");
2101 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2102 bounds_check(cp, index, CHECK_0);
2103 constantTag tag = cp->tag_at(index);
2104 if (!tag.is_int()) {
2105 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2106 }
2107 return cp->int_at(index);
2108 }
2109 JVM_END
2110
2111 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2112 {
2113 JVMWrapper("JVM_ConstantPoolGetLongAt");
2114 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2115 bounds_check(cp, index, CHECK_(0L));
2116 constantTag tag = cp->tag_at(index);
2117 if (!tag.is_long()) {
2118 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2119 }
2120 return cp->long_at(index);
2121 }
2122 JVM_END
2123
2124 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2125 {
2126 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2127 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2128 bounds_check(cp, index, CHECK_(0.0f));
2129 constantTag tag = cp->tag_at(index);
2130 if (!tag.is_float()) {
2131 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2132 }
2133 return cp->float_at(index);
2134 }
2135 JVM_END
2136
2137 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2138 {
2139 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2140 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2141 bounds_check(cp, index, CHECK_(0.0));
2142 constantTag tag = cp->tag_at(index);
2143 if (!tag.is_double()) {
2144 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2145 }
2146 return cp->double_at(index);
2147 }
2148 JVM_END
2149
2150 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2151 {
2152 JVMWrapper("JVM_ConstantPoolGetStringAt");
2153 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2154 bounds_check(cp, index, CHECK_NULL);
2155 constantTag tag = cp->tag_at(index);
2156 if (!tag.is_string()) {
2157 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2158 }
2159 oop str = cp->string_at(index, CHECK_NULL);
2160 return (jstring) JNIHandles::make_local(str);
2161 }
2162 JVM_END
2163
2164 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2165 {
2166 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2167 JvmtiVMObjectAllocEventCollector oam;
2168 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2169 bounds_check(cp, index, CHECK_NULL);
2170 constantTag tag = cp->tag_at(index);
2171 if (!tag.is_symbol()) {
2172 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2173 }
2174 Symbol* sym = cp->symbol_at(index);
2175 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2176 return (jstring) JNIHandles::make_local(str());
2177 }
2178 JVM_END
2179
2180 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2181 {
2182 JVMWrapper("JVM_ConstantPoolGetTagAt");
2183 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2184 bounds_check(cp, index, CHECK_0);
2185 constantTag tag = cp->tag_at(index);
2186 jbyte result = tag.value();
2187 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2188 // they are changed to the corresponding tags from the JVM spec, so that java code in
2189 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2190 if (tag.is_klass_or_reference()) {
2191 result = JVM_CONSTANT_Class;
2192 } else if (tag.is_string_index()) {
2193 result = JVM_CONSTANT_String;
2194 } else if (tag.is_method_type_in_error()) {
2195 result = JVM_CONSTANT_MethodType;
2196 } else if (tag.is_method_handle_in_error()) {
2197 result = JVM_CONSTANT_MethodHandle;
2198 } else if (tag.is_dynamic_constant_in_error()) {
2199 result = JVM_CONSTANT_Dynamic;
2200 }
2201 return result;
2202 }
2203 JVM_END
2204
2205 // Assertion support. //////////////////////////////////////////////////////////
2206
2207 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2208 JVMWrapper("JVM_DesiredAssertionStatus");
2209 assert(cls != NULL, "bad class");
2210
2211 oop r = JNIHandles::resolve(cls);
2212 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2213 if (java_lang_Class::is_primitive(r)) return false;
2214
2215 Klass* k = java_lang_Class::as_Klass(r);
2216 assert(k->is_instance_klass(), "must be an instance klass");
2217 if (!k->is_instance_klass()) return false;
2218
2219 ResourceMark rm(THREAD);
2220 const char* name = k->name()->as_C_string();
2221 bool system_class = k->class_loader() == NULL;
2222 return JavaAssertions::enabled(name, system_class);
2223
2224 JVM_END
2225
2226
2227 // Return a new AssertionStatusDirectives object with the fields filled in with
2228 // command-line assertion arguments (i.e., -ea, -da).
2229 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2230 JVMWrapper("JVM_AssertionStatusDirectives");
2231 JvmtiVMObjectAllocEventCollector oam;
2232 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2233 return JNIHandles::make_local(env, asd);
2234 JVM_END
2235
2236 // Verification ////////////////////////////////////////////////////////////////////////////////
2237
2238 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2239
2240 // RedefineClasses support: bug 6214132 caused verification to fail.
2241 // All functions from this section should call the jvmtiThreadSate function:
2242 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2243 // The function returns a Klass* of the _scratch_class if the verifier
2244 // was invoked in the middle of the class redefinition.
2245 // Otherwise it returns its argument value which is the _the_class Klass*.
2246 // Please, refer to the description in the jvmtiThreadSate.hpp.
2247
2248 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2249 JVMWrapper("JVM_GetClassNameUTF");
2250 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2251 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2252 return k->name()->as_utf8();
2253 JVM_END
2254
2255
2256 JVM_QUICK_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2257 JVMWrapper("JVM_GetClassCPTypes");
2258 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2259 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2260 // types will have length zero if this is not an InstanceKlass
2261 // (length is determined by call to JVM_GetClassCPEntriesCount)
2262 if (k->is_instance_klass()) {
2263 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2264 for (int index = cp->length() - 1; index >= 0; index--) {
2265 constantTag tag = cp->tag_at(index);
2266 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2267 }
2268 }
2269 JVM_END
2270
2271
2272 JVM_QUICK_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2273 JVMWrapper("JVM_GetClassCPEntriesCount");
2274 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2275 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2276 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2277 JVM_END
2278
2279
2280 JVM_QUICK_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2281 JVMWrapper("JVM_GetClassFieldsCount");
2282 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2283 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2284 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2285 JVM_END
2286
2287
2288 JVM_QUICK_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2289 JVMWrapper("JVM_GetClassMethodsCount");
2290 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2291 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2292 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2293 JVM_END
2294
2295
2296 // The following methods, used for the verifier, are never called with
2297 // array klasses, so a direct cast to InstanceKlass is safe.
2298 // Typically, these methods are called in a loop with bounds determined
2299 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2300 // zero for arrays.
2301 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2302 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2303 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2304 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2305 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2306 int length = method->checked_exceptions_length();
2307 if (length > 0) {
2308 CheckedExceptionElement* table= method->checked_exceptions_start();
2309 for (int i = 0; i < length; i++) {
2310 exceptions[i] = table[i].class_cp_index;
2311 }
2312 }
2313 JVM_END
2314
2315
2316 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2317 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2318 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2319 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2320 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2321 return method->checked_exceptions_length();
2322 JVM_END
2323
2324
2325 JVM_QUICK_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2326 JVMWrapper("JVM_GetMethodIxByteCode");
2327 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2328 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2329 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2330 memcpy(code, method->code_base(), method->code_size());
2331 JVM_END
2332
2333
2334 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2335 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2336 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2337 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2338 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2339 return method->code_size();
2340 JVM_END
2341
2342
2343 JVM_QUICK_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2344 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2345 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2346 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2347 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2348 ExceptionTable extable(method);
2349 entry->start_pc = extable.start_pc(entry_index);
2350 entry->end_pc = extable.end_pc(entry_index);
2351 entry->handler_pc = extable.handler_pc(entry_index);
2352 entry->catchType = extable.catch_type_index(entry_index);
2353 JVM_END
2354
2355
2356 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2357 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2358 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2359 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2360 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2361 return method->exception_table_length();
2362 JVM_END
2363
2364
2365 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2366 JVMWrapper("JVM_GetMethodIxModifiers");
2367 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2368 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2369 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2370 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2371 JVM_END
2372
2373
2374 JVM_QUICK_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2375 JVMWrapper("JVM_GetFieldIxModifiers");
2376 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2377 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2378 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2379 JVM_END
2380
2381
2382 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2383 JVMWrapper("JVM_GetMethodIxLocalsCount");
2384 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2385 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2386 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2387 return method->max_locals();
2388 JVM_END
2389
2390
2391 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2392 JVMWrapper("JVM_GetMethodIxArgsSize");
2393 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2394 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2395 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2396 return method->size_of_parameters();
2397 JVM_END
2398
2399
2400 JVM_QUICK_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2401 JVMWrapper("JVM_GetMethodIxMaxStack");
2402 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2403 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2404 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2405 return method->verifier_max_stack();
2406 JVM_END
2407
2408
2409 JVM_QUICK_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2410 JVMWrapper("JVM_IsConstructorIx");
2411 ResourceMark rm(THREAD);
2412 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2413 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2414 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2415 return method->name() == vmSymbols::object_initializer_name();
2416 JVM_END
2417
2418
2419 JVM_QUICK_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2420 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2421 ResourceMark rm(THREAD);
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->is_overpass();
2426 JVM_END
2427
2428 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2429 JVMWrapper("JVM_GetMethodIxIxUTF");
2430 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2431 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2432 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2433 return method->name()->as_utf8();
2434 JVM_END
2435
2436
2437 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2438 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2439 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2440 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2441 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2442 return method->signature()->as_utf8();
2443 JVM_END
2444
2445 /**
2446 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2447 * read entries in the constant pool. Since the old verifier always
2448 * works on a copy of the code, it will not see any rewriting that
2449 * may possibly occur in the middle of verification. So it is important
2450 * that nothing it calls tries to use the cpCache instead of the raw
2451 * constant pool, so we must use cp->uncached_x methods when appropriate.
2452 */
2453 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2454 JVMWrapper("JVM_GetCPFieldNameUTF");
2455 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2456 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2457 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2458 switch (cp->tag_at(cp_index).value()) {
2459 case JVM_CONSTANT_Fieldref:
2460 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2461 default:
2462 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2463 }
2464 ShouldNotReachHere();
2465 return NULL;
2466 JVM_END
2467
2468
2469 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2470 JVMWrapper("JVM_GetCPMethodNameUTF");
2471 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2472 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2473 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2474 switch (cp->tag_at(cp_index).value()) {
2475 case JVM_CONSTANT_InterfaceMethodref:
2476 case JVM_CONSTANT_Methodref:
2477 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2478 default:
2479 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2480 }
2481 ShouldNotReachHere();
2482 return NULL;
2483 JVM_END
2484
2485
2486 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2487 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2488 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2489 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2490 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2491 switch (cp->tag_at(cp_index).value()) {
2492 case JVM_CONSTANT_InterfaceMethodref:
2493 case JVM_CONSTANT_Methodref:
2494 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2495 default:
2496 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2497 }
2498 ShouldNotReachHere();
2499 return NULL;
2500 JVM_END
2501
2502
2503 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2504 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2505 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2506 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2507 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2508 switch (cp->tag_at(cp_index).value()) {
2509 case JVM_CONSTANT_Fieldref:
2510 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2511 default:
2512 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2513 }
2514 ShouldNotReachHere();
2515 return NULL;
2516 JVM_END
2517
2518
2519 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2520 JVMWrapper("JVM_GetCPClassNameUTF");
2521 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2522 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2523 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2524 Symbol* classname = cp->klass_name_at(cp_index);
2525 return classname->as_utf8();
2526 JVM_END
2527
2528
2529 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2530 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2531 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2532 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2533 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2534 switch (cp->tag_at(cp_index).value()) {
2535 case JVM_CONSTANT_Fieldref: {
2536 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2537 Symbol* classname = cp->klass_name_at(class_index);
2538 return classname->as_utf8();
2539 }
2540 default:
2541 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2542 }
2543 ShouldNotReachHere();
2544 return NULL;
2545 JVM_END
2546
2547
2548 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2549 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2550 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2551 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2552 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2553 switch (cp->tag_at(cp_index).value()) {
2554 case JVM_CONSTANT_Methodref:
2555 case JVM_CONSTANT_InterfaceMethodref: {
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_GetCPMethodClassNameUTF: illegal constant");
2562 }
2563 ShouldNotReachHere();
2564 return NULL;
2565 JVM_END
2566
2567
2568 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2569 JVMWrapper("JVM_GetCPFieldModifiers");
2570 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2571 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2572 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2573 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2574 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2575 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2576 switch (cp->tag_at(cp_index).value()) {
2577 case JVM_CONSTANT_Fieldref: {
2578 Symbol* name = cp->uncached_name_ref_at(cp_index);
2579 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2580 InstanceKlass* ik = InstanceKlass::cast(k_called);
2581 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2582 if (fs.name() == name && fs.signature() == signature) {
2583 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2584 }
2585 }
2586 return -1;
2587 }
2588 default:
2589 fatal("JVM_GetCPFieldModifiers: illegal constant");
2590 }
2591 ShouldNotReachHere();
2592 return 0;
2593 JVM_END
2594
2595
2596 JVM_QUICK_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2597 JVMWrapper("JVM_GetCPMethodModifiers");
2598 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2599 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2600 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2601 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2602 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2603 switch (cp->tag_at(cp_index).value()) {
2604 case JVM_CONSTANT_Methodref:
2605 case JVM_CONSTANT_InterfaceMethodref: {
2606 Symbol* name = cp->uncached_name_ref_at(cp_index);
2607 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2608 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2609 int methods_count = methods->length();
2610 for (int i = 0; i < methods_count; i++) {
2611 Method* method = methods->at(i);
2612 if (method->name() == name && method->signature() == signature) {
2613 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2614 }
2615 }
2616 return -1;
2617 }
2618 default:
2619 fatal("JVM_GetCPMethodModifiers: illegal constant");
2620 }
2621 ShouldNotReachHere();
2622 return 0;
2623 JVM_END
2624
2625
2626 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2627
2628 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2629 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2630 JVM_END
2631
2632
2633 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2634 JVMWrapper("JVM_IsSameClassPackage");
2635 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2636 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2637 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2638 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2639 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2640 JVM_END
2641
2642 // Printing support //////////////////////////////////////////////////
2643 extern "C" {
2644
2645 ATTRIBUTE_PRINTF(3, 0)
2646 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2647 // Reject count values that are negative signed values converted to
2648 // unsigned; see bug 4399518, 4417214
2649 if ((intptr_t)count <= 0) return -1;
2650
2651 int result = os::vsnprintf(str, count, fmt, args);
2652 if (result > 0 && (size_t)result >= count) {
2653 result = -1;
2654 }
2655
2656 return result;
2657 }
2658
2659 ATTRIBUTE_PRINTF(3, 4)
2660 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2661 va_list args;
2662 int len;
2663 va_start(args, fmt);
2664 len = jio_vsnprintf(str, count, fmt, args);
2665 va_end(args);
2666 return len;
2667 }
2668
2669 ATTRIBUTE_PRINTF(2, 3)
2670 int jio_fprintf(FILE* f, const char *fmt, ...) {
2671 int len;
2672 va_list args;
2673 va_start(args, fmt);
2674 len = jio_vfprintf(f, fmt, args);
2675 va_end(args);
2676 return len;
2677 }
2678
2679 ATTRIBUTE_PRINTF(2, 0)
2680 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2681 if (Arguments::vfprintf_hook() != NULL) {
2682 return Arguments::vfprintf_hook()(f, fmt, args);
2683 } else {
2684 return vfprintf(f, fmt, args);
2685 }
2686 }
2687
2688 ATTRIBUTE_PRINTF(1, 2)
2689 JNIEXPORT int jio_printf(const char *fmt, ...) {
2690 int len;
2691 va_list args;
2692 va_start(args, fmt);
2693 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2694 va_end(args);
2695 return len;
2696 }
2697
2698 // HotSpot specific jio method
2699 void jio_print(const char* s, size_t len) {
2700 // Try to make this function as atomic as possible.
2701 if (Arguments::vfprintf_hook() != NULL) {
2702 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2703 } else {
2704 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2705 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2706 }
2707 }
2708
2709 } // Extern C
2710
2711 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2712
2713 // In most of the JVM thread support functions we need to access the
2714 // thread through a ThreadsListHandle to prevent it from exiting and
2715 // being reclaimed while we try to operate on it. The exceptions to this
2716 // rule are when operating on the current thread, or if the monitor of
2717 // the target java.lang.Thread is locked at the Java level - in both
2718 // cases the target cannot exit.
2719
2720 static void thread_entry(JavaThread* thread, TRAPS) {
2721 HandleMark hm(THREAD);
2722 Handle obj(THREAD, thread->threadObj());
2723 JavaValue result(T_VOID);
2724 JavaCalls::call_virtual(&result,
2725 obj,
2726 SystemDictionary::Thread_klass(),
2727 vmSymbols::run_method_name(),
2728 vmSymbols::void_method_signature(),
2729 THREAD);
2730 }
2731
2732
2733 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2734 JVMWrapper("JVM_StartThread");
2735 JavaThread *native_thread = NULL;
2736
2737 // We cannot hold the Threads_lock when we throw an exception,
2738 // due to rank ordering issues. Example: we might need to grab the
2739 // Heap_lock while we construct the exception.
2740 bool throw_illegal_thread_state = false;
2741
2742 // We must release the Threads_lock before we can post a jvmti event
2743 // in Thread::start.
2744 {
2745 // Ensure that the C++ Thread and OSThread structures aren't freed before
2746 // we operate.
2747 MutexLocker mu(Threads_lock);
2748
2749 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2750 // re-starting an already started thread, so we should usually find
2751 // that the JavaThread is null. However for a JNI attached thread
2752 // there is a small window between the Thread object being created
2753 // (with its JavaThread set) and the update to its threadStatus, so we
2754 // have to check for this
2755 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2756 throw_illegal_thread_state = true;
2757 } else {
2758 // We could also check the stillborn flag to see if this thread was already stopped, but
2759 // for historical reasons we let the thread detect that itself when it starts running
2760
2761 jlong size =
2762 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2763 // Allocate the C++ Thread structure and create the native thread. The
2764 // stack size retrieved from java is 64-bit signed, but the constructor takes
2765 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2766 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2767 // - Avoid passing negative values which would result in really large stacks.
2768 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2769 size_t sz = size > 0 ? (size_t) size : 0;
2770 native_thread = new JavaThread(&thread_entry, sz);
2771
2772 // At this point it may be possible that no osthread was created for the
2773 // JavaThread due to lack of memory. Check for this situation and throw
2774 // an exception if necessary. Eventually we may want to change this so
2775 // that we only grab the lock if the thread was created successfully -
2776 // then we can also do this check and throw the exception in the
2777 // JavaThread constructor.
2778 if (native_thread->osthread() != NULL) {
2779 // Note: the current thread is not being used within "prepare".
2780 native_thread->prepare(jthread);
2781 }
2782 }
2783 }
2784
2785 if (throw_illegal_thread_state) {
2786 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2787 }
2788
2789 assert(native_thread != NULL, "Starting null thread?");
2790
2791 if (native_thread->osthread() == NULL) {
2792 // No one should hold a reference to the 'native_thread'.
2793 native_thread->smr_delete();
2794 if (JvmtiExport::should_post_resource_exhausted()) {
2795 JvmtiExport::post_resource_exhausted(
2796 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2797 os::native_thread_creation_failed_msg());
2798 }
2799 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2800 os::native_thread_creation_failed_msg());
2801 }
2802
2803 Thread::start(native_thread);
2804
2805 JVM_END
2806
2807
2808 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2809 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2810 // but is thought to be reliable and simple. In the case, where the receiver is the
2811 // same thread as the sender, no VM_Operation is needed.
2812 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2813 JVMWrapper("JVM_StopThread");
2814
2815 // A nested ThreadsListHandle will grab the Threads_lock so create
2816 // tlh before we resolve throwable.
2817 ThreadsListHandle tlh(thread);
2818 oop java_throwable = JNIHandles::resolve(throwable);
2819 if (java_throwable == NULL) {
2820 THROW(vmSymbols::java_lang_NullPointerException());
2821 }
2822 oop java_thread = NULL;
2823 JavaThread* receiver = NULL;
2824 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2825 Events::log_exception(thread,
2826 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2827 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2828
2829 if (is_alive) {
2830 // jthread refers to a live JavaThread.
2831 if (thread == receiver) {
2832 // Exception is getting thrown at self so no VM_Operation needed.
2833 THROW_OOP(java_throwable);
2834 } else {
2835 // Use a VM_Operation to throw the exception.
2836 Thread::send_async_exception(java_thread, java_throwable);
2837 }
2838 } else {
2839 // Either:
2840 // - target thread has not been started before being stopped, or
2841 // - target thread already terminated
2842 // We could read the threadStatus to determine which case it is
2843 // but that is overkill as it doesn't matter. We must set the
2844 // stillborn flag for the first case, and if the thread has already
2845 // exited setting this flag has no effect.
2846 java_lang_Thread::set_stillborn(java_thread);
2847 }
2848 JVM_END
2849
2850
2851 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2852 JVMWrapper("JVM_IsThreadAlive");
2853
2854 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2855 return java_lang_Thread::is_alive(thread_oop);
2856 JVM_END
2857
2858
2859 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2860 JVMWrapper("JVM_SuspendThread");
2861
2862 ThreadsListHandle tlh(thread);
2863 JavaThread* receiver = NULL;
2864 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2865 if (is_alive) {
2866 // jthread refers to a live JavaThread.
2867 {
2868 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2869 if (receiver->is_external_suspend()) {
2870 // Don't allow nested external suspend requests. We can't return
2871 // an error from this interface so just ignore the problem.
2872 return;
2873 }
2874 if (receiver->is_exiting()) { // thread is in the process of exiting
2875 return;
2876 }
2877 receiver->set_external_suspend();
2878 }
2879
2880 // java_suspend() will catch threads in the process of exiting
2881 // and will ignore them.
2882 receiver->java_suspend();
2883
2884 // It would be nice to have the following assertion in all the
2885 // time, but it is possible for a racing resume request to have
2886 // resumed this thread right after we suspended it. Temporarily
2887 // enable this assertion if you are chasing a different kind of
2888 // bug.
2889 //
2890 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2891 // receiver->is_being_ext_suspended(), "thread is not suspended");
2892 }
2893 JVM_END
2894
2895
2896 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2897 JVMWrapper("JVM_ResumeThread");
2898
2899 ThreadsListHandle tlh(thread);
2900 JavaThread* receiver = NULL;
2901 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2902 if (is_alive) {
2903 // jthread refers to a live JavaThread.
2904
2905 // This is the original comment for this Threads_lock grab:
2906 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2907 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2908 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2909 // looks at it.
2910 //
2911 // The above comment dates back to when we had both internal and
2912 // external suspend APIs that shared a common underlying mechanism.
2913 // External suspend is now entirely cooperative and doesn't share
2914 // anything with internal suspend. That said, there are some
2915 // assumptions in the VM that an external resume grabs the
2916 // Threads_lock. We can't drop the Threads_lock grab here until we
2917 // resolve the assumptions that exist elsewhere.
2918 //
2919 MutexLocker ml(Threads_lock);
2920 receiver->java_resume();
2921 }
2922 JVM_END
2923
2924
2925 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2926 JVMWrapper("JVM_SetThreadPriority");
2927
2928 ThreadsListHandle tlh(thread);
2929 oop java_thread = NULL;
2930 JavaThread* receiver = NULL;
2931 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2932 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2933
2934 if (is_alive) {
2935 // jthread refers to a live JavaThread.
2936 Thread::set_priority(receiver, (ThreadPriority)prio);
2937 }
2938 // Implied else: If the JavaThread hasn't started yet, then the
2939 // priority set in the java.lang.Thread object above will be pushed
2940 // down when it does start.
2941 JVM_END
2942
2943
2944 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2945 JVMWrapper("JVM_Yield");
2946 if (os::dont_yield()) return;
2947 HOTSPOT_THREAD_YIELD();
2948 os::naked_yield();
2949 JVM_END
2950
2951 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
2952 assert(event != NULL, "invariant");
2953 assert(event->should_commit(), "invariant");
2954 event->set_time(millis);
2955 event->commit();
2956 }
2957
2958 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2959 JVMWrapper("JVM_Sleep");
2960
2961 if (millis < 0) {
2962 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2963 }
2964
2965 if (Thread::is_interrupted (THREAD, true) && !HAS_PENDING_EXCEPTION) {
2966 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2967 }
2968
2969 // Save current thread state and restore it at the end of this block.
2970 // And set new thread state to SLEEPING.
2971 JavaThreadSleepState jtss(thread);
2972
2973 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2974 EventThreadSleep event;
2975
2976 if (millis == 0) {
2977 os::naked_yield();
2978 } else {
2979 ThreadState old_state = thread->osthread()->get_state();
2980 thread->osthread()->set_state(SLEEPING);
2981 if (os::sleep(thread, millis, true) == OS_INTRPT) {
2982 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
2983 // us while we were sleeping. We do not overwrite those.
2984 if (!HAS_PENDING_EXCEPTION) {
2985 if (event.should_commit()) {
2986 post_thread_sleep_event(&event, millis);
2987 }
2988 HOTSPOT_THREAD_SLEEP_END(1);
2989
2990 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2991 // to properly restore the thread state. That's likely wrong.
2992 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2993 }
2994 }
2995 thread->osthread()->set_state(old_state);
2996 }
2997 if (event.should_commit()) {
2998 post_thread_sleep_event(&event, millis);
2999 }
3000 HOTSPOT_THREAD_SLEEP_END(0);
3001 JVM_END
3002
3003 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3004 JVMWrapper("JVM_CurrentThread");
3005 oop jthread = thread->threadObj();
3006 assert (thread != NULL, "no current thread!");
3007 return JNIHandles::make_local(env, jthread);
3008 JVM_END
3009
3010 class CountStackFramesTC : public ThreadClosure {
3011 int _count;
3012 bool _suspended;
3013 public:
3014 CountStackFramesTC() : _count(0), _suspended(false) {}
3015 virtual void do_thread(Thread* thread) {
3016 JavaThread* jt = (JavaThread*)thread;
3017 if (!jt->is_external_suspend()) {
3018 // To keep same behavior we fail this operation,
3019 // even if it would work perfectly.
3020 return;
3021 }
3022 _suspended = true;
3023 // Count all java activation, i.e., number of vframes.
3024 for (vframeStream vfst(jt); !vfst.at_end(); vfst.next()) {
3025 // Native frames are not counted.
3026 if (!vfst.method()->is_native()) _count++;
3027 }
3028 }
3029 int count() { return _count; }
3030 int suspended() { return _suspended; }
3031 };
3032
3033 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3034 JVMWrapper("JVM_CountStackFrames");
3035
3036 ThreadsListHandle tlh(thread);
3037 JavaThread* receiver = NULL;
3038 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3039 if (is_alive) {
3040 // jthread refers to a live JavaThread.
3041 CountStackFramesTC csf;
3042 Handshake::execute(&csf, receiver);
3043 if (!csf.suspended()) {
3044 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3045 "this thread is not suspended");
3046 }
3047 return csf.count();
3048 }
3049 // Implied else: if JavaThread is not alive simply return a count of 0.
3050 return 0;
3051 JVM_END
3052
3053
3054 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3055 JVMWrapper("JVM_Interrupt");
3056
3057 ThreadsListHandle tlh(thread);
3058 JavaThread* receiver = NULL;
3059 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3060 if (is_alive) {
3061 // jthread refers to a live JavaThread.
3062 Thread::interrupt(receiver);
3063 }
3064 JVM_END
3065
3066
3067 JVM_QUICK_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3068 JVMWrapper("JVM_IsInterrupted");
3069
3070 ThreadsListHandle tlh(thread);
3071 JavaThread* receiver = NULL;
3072 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3073 if (is_alive) {
3074 // jthread refers to a live JavaThread.
3075 return (jboolean) Thread::is_interrupted(receiver, clear_interrupted != 0);
3076 } else {
3077 return JNI_FALSE;
3078 }
3079 JVM_END
3080
3081
3082 // Return true iff the current thread has locked the object passed in
3083
3084 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3085 JVMWrapper("JVM_HoldsLock");
3086 assert(THREAD->is_Java_thread(), "sanity check");
3087 if (obj == NULL) {
3088 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3089 }
3090 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3091 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3092 JVM_END
3093
3094
3095 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3096 JVMWrapper("JVM_DumpAllStacks");
3097 VM_PrintThreads op;
3098 VMThread::execute(&op);
3099 if (JvmtiExport::should_post_data_dump()) {
3100 JvmtiExport::post_data_dump();
3101 }
3102 JVM_END
3103
3104 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3105 JVMWrapper("JVM_SetNativeThreadName");
3106
3107 // We don't use a ThreadsListHandle here because the current thread
3108 // must be alive.
3109 oop java_thread = JNIHandles::resolve_non_null(jthread);
3110 JavaThread* thr = java_lang_Thread::thread(java_thread);
3111 if (thread == thr && !thr->has_attached_via_jni()) {
3112 // Thread naming is only supported for the current thread and
3113 // we don't set the name of an attached thread to avoid stepping
3114 // on other programs.
3115 ResourceMark rm(thread);
3116 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3117 os::set_native_thread_name(thread_name);
3118 }
3119 JVM_END
3120
3121 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3122
3123 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3124 JVMWrapper("JVM_GetClassContext");
3125 ResourceMark rm(THREAD);
3126 JvmtiVMObjectAllocEventCollector oam;
3127 vframeStream vfst(thread);
3128
3129 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3130 // This must only be called from SecurityManager.getClassContext
3131 Method* m = vfst.method();
3132 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3133 m->name() == vmSymbols::getClassContext_name() &&
3134 m->signature() == vmSymbols::void_class_array_signature())) {
3135 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3136 }
3137 }
3138
3139 // Collect method holders
3140 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3141 for (; !vfst.at_end(); vfst.security_next()) {
3142 Method* m = vfst.method();
3143 // Native frames are not returned
3144 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3145 Klass* holder = m->method_holder();
3146 assert(holder->is_klass(), "just checking");
3147 klass_array->append(holder);
3148 }
3149 }
3150
3151 // Create result array of type [Ljava/lang/Class;
3152 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3153 // Fill in mirrors corresponding to method holders
3154 for (int i = 0; i < klass_array->length(); i++) {
3155 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3156 }
3157
3158 return (jobjectArray) JNIHandles::make_local(env, result);
3159 JVM_END
3160
3161
3162 // java.lang.Package ////////////////////////////////////////////////////////////////
3163
3164
3165 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3166 JVMWrapper("JVM_GetSystemPackage");
3167 ResourceMark rm(THREAD);
3168 JvmtiVMObjectAllocEventCollector oam;
3169 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3170 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3171 return (jstring) JNIHandles::make_local(result);
3172 JVM_END
3173
3174
3175 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3176 JVMWrapper("JVM_GetSystemPackages");
3177 JvmtiVMObjectAllocEventCollector oam;
3178 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3179 return (jobjectArray) JNIHandles::make_local(result);
3180 JVM_END
3181
3182
3183 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3184
3185
3186 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3187 JVMWrapper("JVM_GetAndClearReferencePendingList");
3188
3189 MonitorLocker ml(Heap_lock);
3190 oop ref = Universe::reference_pending_list();
3191 if (ref != NULL) {
3192 Universe::set_reference_pending_list(NULL);
3193 }
3194 return JNIHandles::make_local(env, ref);
3195 JVM_END
3196
3197 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3198 JVMWrapper("JVM_HasReferencePendingList");
3199 MonitorLocker ml(Heap_lock);
3200 return Universe::has_reference_pending_list();
3201 JVM_END
3202
3203 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3204 JVMWrapper("JVM_WaitForReferencePendingList");
3205 MonitorLocker ml(Heap_lock);
3206 while (!Universe::has_reference_pending_list()) {
3207 ml.wait();
3208 }
3209 JVM_END
3210
3211
3212 // ObjectInputStream ///////////////////////////////////////////////////////////////
3213
3214 // Return the first user-defined class loader up the execution stack, or null
3215 // if only code from the bootstrap or platform class loader is on the stack.
3216
3217 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3218 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3219 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3220 oop loader = vfst.method()->method_holder()->class_loader();
3221 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3222 return JNIHandles::make_local(env, loader);
3223 }
3224 }
3225 return NULL;
3226 JVM_END
3227
3228
3229 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3230
3231
3232 // resolve array handle and check arguments
3233 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3234 if (arr == NULL) {
3235 THROW_0(vmSymbols::java_lang_NullPointerException());
3236 }
3237 oop a = JNIHandles::resolve_non_null(arr);
3238 if (!a->is_array()) {
3239 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3240 } else if (type_array_only && !a->is_typeArray()) {
3241 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3242 }
3243 return arrayOop(a);
3244 }
3245
3246
3247 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3248 JVMWrapper("JVM_GetArrayLength");
3249 arrayOop a = check_array(env, arr, false, CHECK_0);
3250 return a->length();
3251 JVM_END
3252
3253
3254 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3255 JVMWrapper("JVM_Array_Get");
3256 JvmtiVMObjectAllocEventCollector oam;
3257 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3258 jvalue value;
3259 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3260 oop box = Reflection::box(&value, type, CHECK_NULL);
3261 return JNIHandles::make_local(env, box);
3262 JVM_END
3263
3264
3265 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3266 JVMWrapper("JVM_GetPrimitiveArrayElement");
3267 jvalue value;
3268 value.i = 0; // to initialize value before getting used in CHECK
3269 arrayOop a = check_array(env, arr, true, CHECK_(value));
3270 assert(a->is_typeArray(), "just checking");
3271 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3272 BasicType wide_type = (BasicType) wCode;
3273 if (type != wide_type) {
3274 Reflection::widen(&value, type, wide_type, CHECK_(value));
3275 }
3276 return value;
3277 JVM_END
3278
3279
3280 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3281 JVMWrapper("JVM_SetArrayElement");
3282 arrayOop a = check_array(env, arr, false, CHECK);
3283 oop box = JNIHandles::resolve(val);
3284 jvalue value;
3285 value.i = 0; // to initialize value before getting used in CHECK
3286 BasicType value_type;
3287 if (a->is_objArray()) {
3288 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3289 value_type = Reflection::unbox_for_regular_object(box, &value);
3290 } else {
3291 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3292 }
3293 Reflection::array_set(&value, a, index, value_type, CHECK);
3294 JVM_END
3295
3296
3297 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3298 JVMWrapper("JVM_SetPrimitiveArrayElement");
3299 arrayOop a = check_array(env, arr, true, CHECK);
3300 assert(a->is_typeArray(), "just checking");
3301 BasicType value_type = (BasicType) vCode;
3302 Reflection::array_set(&v, a, index, value_type, CHECK);
3303 JVM_END
3304
3305
3306 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3307 JVMWrapper("JVM_NewArray");
3308 JvmtiVMObjectAllocEventCollector oam;
3309 oop element_mirror = JNIHandles::resolve(eltClass);
3310 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3311 return JNIHandles::make_local(env, result);
3312 JVM_END
3313
3314
3315 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3316 JVMWrapper("JVM_NewMultiArray");
3317 JvmtiVMObjectAllocEventCollector oam;
3318 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3319 oop element_mirror = JNIHandles::resolve(eltClass);
3320 assert(dim_array->is_typeArray(), "just checking");
3321 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3322 return JNIHandles::make_local(env, result);
3323 JVM_END
3324
3325
3326 // Library support ///////////////////////////////////////////////////////////////////////////
3327
3328 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3329 //%note jvm_ct
3330 JVMWrapper("JVM_LoadLibrary");
3331 char ebuf[1024];
3332 void *load_result;
3333 {
3334 ThreadToNativeFromVM ttnfvm(thread);
3335 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3336 }
3337 if (load_result == NULL) {
3338 char msg[1024];
3339 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3340 // Since 'ebuf' may contain a string encoded using
3341 // platform encoding scheme, we need to pass
3342 // Exceptions::unsafe_to_utf8 to the new_exception method
3343 // as the last argument. See bug 6367357.
3344 Handle h_exception =
3345 Exceptions::new_exception(thread,
3346 vmSymbols::java_lang_UnsatisfiedLinkError(),
3347 msg, Exceptions::unsafe_to_utf8);
3348
3349 THROW_HANDLE_0(h_exception);
3350 }
3351 return load_result;
3352 JVM_END
3353
3354
3355 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3356 JVMWrapper("JVM_UnloadLibrary");
3357 os::dll_unload(handle);
3358 JVM_END
3359
3360
3361 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3362 JVMWrapper("JVM_FindLibraryEntry");
3363 return os::dll_lookup(handle, name);
3364 JVM_END
3365
3366
3367 // JNI version ///////////////////////////////////////////////////////////////////////////////
3368
3369 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3370 JVMWrapper("JVM_IsSupportedJNIVersion");
3371 return Threads::is_supported_jni_version_including_1_1(version);
3372 JVM_END
3373
3374
3375 // String support ///////////////////////////////////////////////////////////////////////////
3376
3377 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3378 JVMWrapper("JVM_InternString");
3379 JvmtiVMObjectAllocEventCollector oam;
3380 if (str == NULL) return NULL;
3381 oop string = JNIHandles::resolve_non_null(str);
3382 oop result = StringTable::intern(string, CHECK_NULL);
3383 return (jstring) JNIHandles::make_local(env, result);
3384 JVM_END
3385
3386
3387 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3388
3389 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3390 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3391 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3392 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3393 // nature. JavaThreads will be "in native" when using this API from JDK code.
3394
3395
3396 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3397 VM_Exit::block_if_vm_exited();
3398 JVMWrapper("JVM_RawMonitorCreate");
3399 return new os::PlatformMutex();
3400 }
3401
3402
3403 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3404 VM_Exit::block_if_vm_exited();
3405 JVMWrapper("JVM_RawMonitorDestroy");
3406 delete ((os::PlatformMutex*) mon);
3407 }
3408
3409
3410 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3411 VM_Exit::block_if_vm_exited();
3412 JVMWrapper("JVM_RawMonitorEnter");
3413 ((os::PlatformMutex*) mon)->lock();
3414 return 0;
3415 }
3416
3417
3418 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3419 VM_Exit::block_if_vm_exited();
3420 JVMWrapper("JVM_RawMonitorExit");
3421 ((os::PlatformMutex*) mon)->unlock();
3422 }
3423
3424
3425 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3426
3427 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3428 Handle loader, Handle protection_domain,
3429 jboolean throwError, TRAPS) {
3430 // Security Note:
3431 // The Java level wrapper will perform the necessary security check allowing
3432 // us to pass the NULL as the initiating class loader. The VM is responsible for
3433 // the checkPackageAccess relative to the initiating class loader via the
3434 // protection_domain. The protection_domain is passed as NULL by the java code
3435 // if there is no security manager in 3-arg Class.forName().
3436 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3437
3438 // Check if we should initialize the class
3439 if (init && klass->is_instance_klass()) {
3440 klass->initialize(CHECK_NULL);
3441 }
3442 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3443 }
3444
3445
3446 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3447
3448 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3449 JVMWrapper("JVM_InvokeMethod");
3450 Handle method_handle;
3451 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3452 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3453 Handle receiver(THREAD, JNIHandles::resolve(obj));
3454 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3455 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3456 jobject res = JNIHandles::make_local(env, result);
3457 if (JvmtiExport::should_post_vm_object_alloc()) {
3458 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3459 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3460 if (java_lang_Class::is_primitive(ret_type)) {
3461 // Only for primitive type vm allocates memory for java object.
3462 // See box() method.
3463 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3464 }
3465 }
3466 return res;
3467 } else {
3468 THROW_0(vmSymbols::java_lang_StackOverflowError());
3469 }
3470 JVM_END
3471
3472
3473 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3474 JVMWrapper("JVM_NewInstanceFromConstructor");
3475 oop constructor_mirror = JNIHandles::resolve(c);
3476 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3477 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3478 jobject res = JNIHandles::make_local(env, result);
3479 if (JvmtiExport::should_post_vm_object_alloc()) {
3480 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3481 }
3482 return res;
3483 JVM_END
3484
3485 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3486
3487 JVM_LEAF(jboolean, JVM_SupportsCX8())
3488 JVMWrapper("JVM_SupportsCX8");
3489 return VM_Version::supports_cx8();
3490 JVM_END
3491
3492 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3493 JVMWrapper("JVM_InitializeFromArchive");
3494 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3495 assert(k->is_klass(), "just checking");
3496 HeapShared::initialize_from_archived_subgraph(k);
3497 JVM_END
3498
3499 // Returns an array of all live Thread objects (VM internal JavaThreads,
3500 // jvmti agent threads, and JNI attaching threads are skipped)
3501 // See CR 6404306 regarding JNI attaching threads
3502 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3503 ResourceMark rm(THREAD);
3504 ThreadsListEnumerator tle(THREAD, false, false);
3505 JvmtiVMObjectAllocEventCollector oam;
3506
3507 int num_threads = tle.num_threads();
3508 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3509 objArrayHandle threads_ah(THREAD, r);
3510
3511 for (int i = 0; i < num_threads; i++) {
3512 Handle h = tle.get_threadObj(i);
3513 threads_ah->obj_at_put(i, h());
3514 }
3515
3516 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3517 JVM_END
3518
3519
3520 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3521 // Return StackTraceElement[][], each element is the stack trace of a thread in
3522 // the corresponding entry in the given threads array
3523 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3524 JVMWrapper("JVM_DumpThreads");
3525 JvmtiVMObjectAllocEventCollector oam;
3526
3527 // Check if threads is null
3528 if (threads == NULL) {
3529 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3530 }
3531
3532 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3533 objArrayHandle ah(THREAD, a);
3534 int num_threads = ah->length();
3535 // check if threads is non-empty array
3536 if (num_threads == 0) {
3537 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3538 }
3539
3540 // check if threads is not an array of objects of Thread class
3541 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3542 if (k != SystemDictionary::Thread_klass()) {
3543 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3544 }
3545
3546 ResourceMark rm(THREAD);
3547
3548 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3549 for (int i = 0; i < num_threads; i++) {
3550 oop thread_obj = ah->obj_at(i);
3551 instanceHandle h(THREAD, (instanceOop) thread_obj);
3552 thread_handle_array->append(h);
3553 }
3554
3555 // The JavaThread references in thread_handle_array are validated
3556 // in VM_ThreadDump::doit().
3557 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3558 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3559
3560 JVM_END
3561
3562 // JVM monitoring and management support
3563 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3564 return Management::get_jmm_interface(version);
3565 JVM_END
3566
3567 // com.sun.tools.attach.VirtualMachine agent properties support
3568 //
3569 // Initialize the agent properties with the properties maintained in the VM
3570 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3571 JVMWrapper("JVM_InitAgentProperties");
3572 ResourceMark rm;
3573
3574 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3575
3576 PUTPROP(props, "sun.java.command", Arguments::java_command());
3577 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3578 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3579 return properties;
3580 JVM_END
3581
3582 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3583 {
3584 JVMWrapper("JVM_GetEnclosingMethodInfo");
3585 JvmtiVMObjectAllocEventCollector oam;
3586
3587 if (ofClass == NULL) {
3588 return NULL;
3589 }
3590 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3591 // Special handling for primitive objects
3592 if (java_lang_Class::is_primitive(mirror())) {
3593 return NULL;
3594 }
3595 Klass* k = java_lang_Class::as_Klass(mirror());
3596 if (!k->is_instance_klass()) {
3597 return NULL;
3598 }
3599 InstanceKlass* ik = InstanceKlass::cast(k);
3600 int encl_method_class_idx = ik->enclosing_method_class_index();
3601 if (encl_method_class_idx == 0) {
3602 return NULL;
3603 }
3604 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3605 objArrayHandle dest(THREAD, dest_o);
3606 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3607 dest->obj_at_put(0, enc_k->java_mirror());
3608 int encl_method_method_idx = ik->enclosing_method_method_index();
3609 if (encl_method_method_idx != 0) {
3610 Symbol* sym = ik->constants()->symbol_at(
3611 extract_low_short_from_int(
3612 ik->constants()->name_and_type_at(encl_method_method_idx)));
3613 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3614 dest->obj_at_put(1, str());
3615 sym = ik->constants()->symbol_at(
3616 extract_high_short_from_int(
3617 ik->constants()->name_and_type_at(encl_method_method_idx)));
3618 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3619 dest->obj_at_put(2, str());
3620 }
3621 return (jobjectArray) JNIHandles::make_local(dest());
3622 }
3623 JVM_END
3624
3625 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3626 {
3627 memset(info, 0, info_size);
3628
3629 info->jvm_version = VM_Version::jvm_version();
3630 info->patch_version = VM_Version::vm_patch_version();
3631
3632 // when we add a new capability in the jvm_version_info struct, we should also
3633 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3634 // counter defined in runtimeService.cpp.
3635 info->is_attach_supported = AttachListener::is_attach_supported();
3636 }
3637 JVM_END
3638
3639 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3640 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3641 ResourceMark rm(THREAD);
3642
3643 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3644 return NULL;
3645 }
3646
3647 char** vm_flags = Arguments::jvm_flags_array();
3648 char** vm_args = Arguments::jvm_args_array();
3649 int num_flags = Arguments::num_jvm_flags();
3650 int num_args = Arguments::num_jvm_args();
3651
3652 InstanceKlass* ik = SystemDictionary::String_klass();
3653 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3654 objArrayHandle result_h(THREAD, r);
3655
3656 int index = 0;
3657 for (int j = 0; j < num_flags; j++, index++) {
3658 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3659 result_h->obj_at_put(index, h());
3660 }
3661 for (int i = 0; i < num_args; i++, index++) {
3662 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3663 result_h->obj_at_put(index, h());
3664 }
3665 return (jobjectArray) JNIHandles::make_local(env, result_h());
3666 JVM_END
3667
3668 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3669 return os::get_signal_number(name);
3670 JVM_END