1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/modules.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/stringTable.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "gc/shared/collectedHeap.inline.hpp"
40 #include "interpreter/bytecode.hpp"
41 #include "jfr/jfrEvents.hpp"
42 #include "logging/log.hpp"
43 #include "memory/heapShared.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/referenceType.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "memory/universe.hpp"
48 #include "oops/access.inline.hpp"
49 #include "oops/constantPool.hpp"
50 #include "oops/fieldStreams.hpp"
51 #include "oops/instanceKlass.hpp"
52 #include "oops/method.hpp"
53 #include "oops/objArrayKlass.hpp"
54 #include "oops/objArrayOop.inline.hpp"
55 #include "oops/oop.inline.hpp"
56 #include "prims/jvm_misc.hpp"
57 #include "prims/jvmtiExport.hpp"
58 #include "prims/jvmtiThreadState.hpp"
59 #include "prims/nativeLookup.hpp"
60 #include "prims/stackwalk.hpp"
61 #include "runtime/arguments.hpp"
62 #include "runtime/atomic.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/init.hpp"
65 #include "runtime/interfaceSupport.inline.hpp"
66 #include "runtime/deoptimization.hpp"
67 #include "runtime/handshake.hpp"
68 #include "runtime/java.hpp"
69 #include "runtime/javaCalls.hpp"
70 #include "runtime/jfieldIDWorkaround.hpp"
71 #include "runtime/jniHandles.inline.hpp"
72 #include "runtime/orderAccess.hpp"
73 #include "runtime/os.inline.hpp"
74 #include "runtime/perfData.hpp"
75 #include "runtime/reflection.hpp"
76 #include "runtime/thread.inline.hpp"
77 #include "runtime/threadSMR.hpp"
78 #include "runtime/vframe.inline.hpp"
79 #include "runtime/vmOperations.hpp"
80 #include "runtime/vm_version.hpp"
81 #include "services/attachListener.hpp"
82 #include "services/management.hpp"
83 #include "services/threadService.hpp"
84 #include "utilities/copy.hpp"
85 #include "utilities/defaultStream.hpp"
86 #include "utilities/dtrace.hpp"
87 #include "utilities/events.hpp"
88 #include "utilities/histogram.hpp"
89 #include "utilities/macros.hpp"
90 #include "utilities/utf8.hpp"
91 #if INCLUDE_CDS
92 #include "classfile/systemDictionaryShared.hpp"
93 #endif
94
95 #include <errno.h>
96
97 /*
98 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
99 such ctors and calls MUST NOT come between an oop declaration/init and its
100 usage because if objects are move this may cause various memory stomps, bus
101 errors and segfaults. Here is a cookbook for causing so called "naked oop
102 failures":
103
104 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
105 JVMWrapper("JVM_GetClassDeclaredFields");
106
107 // Object address to be held directly in mirror & not visible to GC
108 oop mirror = JNIHandles::resolve_non_null(ofClass);
109
110 // If this ctor can hit a safepoint, moving objects around, then
111 ComplexConstructor foo;
112
113 // Boom! mirror may point to JUNK instead of the intended object
114 (some dereference of mirror)
115
116 // Here's another call that may block for GC, making mirror stale
117 MutexLocker ml(some_lock);
118
119 // And here's an initializer that can result in a stale oop
120 // all in one step.
121 oop o = call_that_can_throw_exception(TRAPS);
122
123
124 The solution is to keep the oop declaration BELOW the ctor or function
125 call that might cause a GC, do another resolve to reassign the oop, or
126 consider use of a Handle instead of an oop so there is immunity from object
127 motion. But note that the "QUICK" entries below do not have a handlemark
128 and thus can only support use of handles passed in.
129 */
130
131 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
132 ResourceMark rm;
133 int line_number = -1;
134 const char * source_file = NULL;
135 const char * trace = "explicit";
136 InstanceKlass* caller = NULL;
137 JavaThread* jthread = JavaThread::current();
138 if (jthread->has_last_Java_frame()) {
139 vframeStream vfst(jthread);
140
141 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
142 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
143 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
144 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
145 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
146
147 Method* last_caller = NULL;
148
149 while (!vfst.at_end()) {
150 Method* m = vfst.method();
151 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
152 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
153 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
154 break;
155 }
156 last_caller = m;
157 vfst.next();
158 }
159 // if this is called from Class.forName0 and that is called from Class.forName,
160 // then print the caller of Class.forName. If this is Class.loadClass, then print
161 // that caller, otherwise keep quiet since this should be picked up elsewhere.
162 bool found_it = false;
163 if (!vfst.at_end() &&
164 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
165 vfst.method()->name() == vmSymbols::forName0_name()) {
166 vfst.next();
167 if (!vfst.at_end() &&
168 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
169 vfst.method()->name() == vmSymbols::forName_name()) {
170 vfst.next();
171 found_it = true;
172 }
173 } else if (last_caller != NULL &&
174 last_caller->method_holder()->name() ==
175 vmSymbols::java_lang_ClassLoader() &&
176 last_caller->name() == vmSymbols::loadClass_name()) {
177 found_it = true;
178 } else if (!vfst.at_end()) {
179 if (vfst.method()->is_native()) {
180 // JNI call
181 found_it = true;
182 }
183 }
184 if (found_it && !vfst.at_end()) {
185 // found the caller
186 caller = vfst.method()->method_holder();
187 line_number = vfst.method()->line_number_from_bci(vfst.bci());
188 if (line_number == -1) {
189 // show method name if it's a native method
190 trace = vfst.method()->name_and_sig_as_C_string();
191 }
192 Symbol* s = caller->source_file_name();
193 if (s != NULL) {
194 source_file = s->as_C_string();
195 }
196 }
197 }
198 if (caller != NULL) {
199 if (to_class != caller) {
200 const char * from = caller->external_name();
201 const char * to = to_class->external_name();
202 // print in a single call to reduce interleaving between threads
203 if (source_file != NULL) {
204 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
205 } else {
206 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
207 }
208 }
209 }
210 }
211
212 void trace_class_resolution(Klass* to_class) {
213 EXCEPTION_MARK;
214 trace_class_resolution_impl(to_class, THREAD);
215 if (HAS_PENDING_EXCEPTION) {
216 CLEAR_PENDING_EXCEPTION;
217 }
218 }
219
220 // Wrapper to trace JVM functions
221
222 #ifdef ASSERT
223 Histogram* JVMHistogram;
224 volatile int JVMHistogram_lock = 0;
225
226 class JVMHistogramElement : public HistogramElement {
227 public:
228 JVMHistogramElement(const char* name);
229 };
230
231 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
232 _name = elementName;
233 uintx count = 0;
234
235 while (Atomic::cmpxchg(1, &JVMHistogram_lock, 0) != 0) {
236 while (OrderAccess::load_acquire(&JVMHistogram_lock) != 0) {
237 count +=1;
238 if ( (WarnOnStalledSpinLock > 0)
239 && (count % WarnOnStalledSpinLock == 0)) {
240 warning("JVMHistogram_lock seems to be stalled");
241 }
242 }
243 }
244
245 if(JVMHistogram == NULL)
246 JVMHistogram = new Histogram("JVM Call Counts",100);
247
248 JVMHistogram->add_element(this);
249 Atomic::dec(&JVMHistogram_lock);
250 }
251
252 #define JVMCountWrapper(arg) \
253 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
254 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
255
256 #define JVMWrapper(arg) JVMCountWrapper(arg);
257 #else
258 #define JVMWrapper(arg)
259 #endif
260
261
262 // Interface version /////////////////////////////////////////////////////////////////////
263
264
265 JVM_LEAF(jint, JVM_GetInterfaceVersion())
266 return JVM_INTERFACE_VERSION;
267 JVM_END
268
269
270 // java.lang.System //////////////////////////////////////////////////////////////////////
271
272
273 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
274 JVMWrapper("JVM_CurrentTimeMillis");
275 return os::javaTimeMillis();
276 JVM_END
277
278 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
279 JVMWrapper("JVM_NanoTime");
280 return os::javaTimeNanos();
281 JVM_END
282
283 // The function below is actually exposed by jdk.internal.misc.VM and not
284 // java.lang.System, but we choose to keep it here so that it stays next
285 // to JVM_CurrentTimeMillis and JVM_NanoTime
286
287 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
288 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
289
290 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
291 JVMWrapper("JVM_GetNanoTimeAdjustment");
292 jlong seconds;
293 jlong nanos;
294
295 os::javaTimeSystemUTC(seconds, nanos);
296
297 // We're going to verify that the result can fit in a long.
298 // For that we need the difference in seconds between 'seconds'
299 // and 'offset_secs' to be such that:
300 // |seconds - offset_secs| < (2^63/10^9)
301 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
302 // which makes |seconds - offset_secs| < 2^33
303 // and we will prefer +/- 2^32 as the maximum acceptable diff
304 // as 2^32 has a more natural feel than 2^33...
305 //
306 // So if |seconds - offset_secs| >= 2^32 - we return a special
307 // sentinel value (-1) which the caller should take as an
308 // exception value indicating that the offset given to us is
309 // too far from range of the current time - leading to too big
310 // a nano adjustment. The caller is expected to recover by
311 // computing a more accurate offset and calling this method
312 // again. (For the record 2^32 secs is ~136 years, so that
313 // should rarely happen)
314 //
315 jlong diff = seconds - offset_secs;
316 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
317 return -1; // sentinel value: the offset is too far off the target
318 }
319
320 // return the adjustment. If you compute a time by adding
321 // this number of nanoseconds along with the number of seconds
322 // in the offset you should get the current UTC time.
323 return (diff * (jlong)1000000000) + nanos;
324 JVM_END
325
326 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
327 jobject dst, jint dst_pos, jint length))
328 JVMWrapper("JVM_ArrayCopy");
329 // Check if we have null pointers
330 if (src == NULL || dst == NULL) {
331 THROW(vmSymbols::java_lang_NullPointerException());
332 }
333 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
334 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
335 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
336 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
337 // Do copy
338 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
339 JVM_END
340
341
342 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
343 JavaValue r(T_OBJECT);
344 // public synchronized Object put(Object key, Object value);
345 HandleMark hm(THREAD);
346 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
347 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
348 JavaCalls::call_virtual(&r,
349 props,
350 SystemDictionary::Properties_klass(),
351 vmSymbols::put_name(),
352 vmSymbols::object_object_object_signature(),
353 key_str,
354 value_str,
355 THREAD);
356 }
357
358
359 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
360
361 /*
362 * Return all of the system properties in a Java String array with alternating
363 * names and values from the jvm SystemProperty.
364 * Which includes some internal and all commandline -D defined properties.
365 */
366 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
367 JVMWrapper("JVM_GetProperties");
368 ResourceMark rm(THREAD);
369 HandleMark hm(THREAD);
370 int ndx = 0;
371 int fixedCount = 2;
372
373 SystemProperty* p = Arguments::system_properties();
374 int count = Arguments::PropertyList_count(p);
375
376 // Allocate result String array
377 InstanceKlass* ik = SystemDictionary::String_klass();
378 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
379 objArrayHandle result_h(THREAD, r);
380
381 while (p != NULL) {
382 const char * key = p->key();
383 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
384 const char * value = p->value();
385 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
386 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
387 result_h->obj_at_put(ndx * 2, key_str());
388 result_h->obj_at_put(ndx * 2 + 1, value_str());
389 ndx++;
390 }
391 p = p->next();
392 }
393
394 // Convert the -XX:MaxDirectMemorySize= command line flag
395 // to the sun.nio.MaxDirectMemorySize property.
396 // Do this after setting user properties to prevent people
397 // from setting the value with a -D option, as requested.
398 // Leave empty if not supplied
399 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
400 char as_chars[256];
401 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
402 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
403 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
404 result_h->obj_at_put(ndx * 2, key_str());
405 result_h->obj_at_put(ndx * 2 + 1, value_str());
406 ndx++;
407 }
408
409 // JVM monitoring and management support
410 // Add the sun.management.compiler property for the compiler's name
411 {
412 #undef CSIZE
413 #if defined(_LP64) || defined(_WIN64)
414 #define CSIZE "64-Bit "
415 #else
416 #define CSIZE
417 #endif // 64bit
418
419 #ifdef TIERED
420 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
421 #else
422 #if defined(COMPILER1)
423 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
424 #elif defined(COMPILER2)
425 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
426 #elif INCLUDE_JVMCI
427 #error "INCLUDE_JVMCI should imply TIERED"
428 #else
429 const char* compiler_name = "";
430 #endif // compilers
431 #endif // TIERED
432
433 if (*compiler_name != '\0' &&
434 (Arguments::mode() != Arguments::_int)) {
435 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
436 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
437 result_h->obj_at_put(ndx * 2, key_str());
438 result_h->obj_at_put(ndx * 2 + 1, value_str());
439 ndx++;
440 }
441 }
442
443 return (jobjectArray) JNIHandles::make_local(env, result_h());
444 JVM_END
445
446
447 /*
448 * Return the temporary directory that the VM uses for the attach
449 * and perf data files.
450 *
451 * It is important that this directory is well-known and the
452 * same for all VM instances. It cannot be affected by configuration
453 * variables such as java.io.tmpdir.
454 */
455 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
456 JVMWrapper("JVM_GetTemporaryDirectory");
457 HandleMark hm(THREAD);
458 const char* temp_dir = os::get_temp_directory();
459 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
460 return (jstring) JNIHandles::make_local(env, h());
461 JVM_END
462
463
464 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
465
466 extern volatile jint vm_created;
467
468 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
469 JVMWrapper("JVM_BeforeHalt");
470 EventShutdown event;
471 if (event.should_commit()) {
472 event.set_reason("Shutdown requested from Java");
473 event.commit();
474 }
475 JVM_END
476
477
478 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
479 before_exit(thread);
480 vm_exit(code);
481 JVM_END
482
483
484 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
485 JVMWrapper("JVM_GC");
486 if (!DisableExplicitGC) {
487 Universe::heap()->collect(GCCause::_java_lang_system_gc);
488 }
489 JVM_END
490
491
492 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
493 JVMWrapper("JVM_MaxObjectInspectionAge");
494 return Universe::heap()->millis_since_last_gc();
495 JVM_END
496
497
498 static inline jlong convert_size_t_to_jlong(size_t val) {
499 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
500 NOT_LP64 (return (jlong)val;)
501 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
502 }
503
504 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
505 JVMWrapper("JVM_TotalMemory");
506 size_t n = Universe::heap()->capacity();
507 return convert_size_t_to_jlong(n);
508 JVM_END
509
510
511 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
512 JVMWrapper("JVM_FreeMemory");
513 size_t n = Universe::heap()->unused();
514 return convert_size_t_to_jlong(n);
515 JVM_END
516
517
518 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
519 JVMWrapper("JVM_MaxMemory");
520 size_t n = Universe::heap()->max_capacity();
521 return convert_size_t_to_jlong(n);
522 JVM_END
523
524
525 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
526 JVMWrapper("JVM_ActiveProcessorCount");
527 return os::active_processor_count();
528 JVM_END
529
530
531
532 // java.lang.Throwable //////////////////////////////////////////////////////
533
534
535 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
536 JVMWrapper("JVM_FillInStackTrace");
537 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
538 java_lang_Throwable::fill_in_stack_trace(exception);
539 JVM_END
540
541
542 // java.lang.StackTraceElement //////////////////////////////////////////////
543
544
545 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
546 JVMWrapper("JVM_InitStackTraceElementArray");
547 Handle exception(THREAD, JNIHandles::resolve(throwable));
548 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
549 objArrayHandle stack_trace(THREAD, st);
550 // Fill in the allocated stack trace
551 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
552 JVM_END
553
554
555 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
556 JVMWrapper("JVM_InitStackTraceElement");
557 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
558 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
559 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
560 JVM_END
561
562
563 // java.lang.StackWalker //////////////////////////////////////////////////////
564
565
566 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
567 jint skip_frames, jint frame_count, jint start_index,
568 jobjectArray frames))
569 JVMWrapper("JVM_CallStackWalk");
570 JavaThread* jt = (JavaThread*) THREAD;
571 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
572 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
573 }
574
575 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
576
577 // frames array is a Class<?>[] array when only getting caller reference,
578 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
579 // be null.
580 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
581 objArrayHandle frames_array_h(THREAD, fa);
582
583 int limit = start_index + frame_count;
584 if (frames_array_h->length() < limit) {
585 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
586 }
587
588 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
589 start_index, frames_array_h, CHECK_NULL);
590 return JNIHandles::make_local(env, result);
591 JVM_END
592
593
594 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
595 jint frame_count, jint start_index,
596 jobjectArray frames))
597 JVMWrapper("JVM_MoreStackWalk");
598 JavaThread* jt = (JavaThread*) THREAD;
599
600 // frames array is a Class<?>[] array when only getting caller reference,
601 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
602 // be null.
603 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
604 objArrayHandle frames_array_h(THREAD, fa);
605
606 int limit = start_index+frame_count;
607 if (frames_array_h->length() < limit) {
608 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
609 }
610
611 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
612 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
613 start_index, frames_array_h, THREAD);
614 JVM_END
615
616 // java.lang.Object ///////////////////////////////////////////////
617
618
619 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
620 JVMWrapper("JVM_IHashCode");
621 // as implemented in the classic virtual machine; return 0 if object is NULL
622 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
623 JVM_END
624
625
626 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
627 JVMWrapper("JVM_MonitorWait");
628 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
629 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
630 if (JvmtiExport::should_post_monitor_wait()) {
631 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
632
633 // The current thread already owns the monitor and it has not yet
634 // been added to the wait queue so the current thread cannot be
635 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
636 // event handler cannot accidentally consume an unpark() meant for
637 // the ParkEvent associated with this ObjectMonitor.
638 }
639 ObjectSynchronizer::wait(obj, ms, CHECK);
640 JVM_END
641
642
643 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
644 JVMWrapper("JVM_MonitorNotify");
645 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
646 ObjectSynchronizer::notify(obj, CHECK);
647 JVM_END
648
649
650 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
651 JVMWrapper("JVM_MonitorNotifyAll");
652 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
653 ObjectSynchronizer::notifyall(obj, CHECK);
654 JVM_END
655
656
657 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
658 JVMWrapper("JVM_Clone");
659 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
660 Klass* klass = obj->klass();
661 JvmtiVMObjectAllocEventCollector oam;
662
663 #ifdef ASSERT
664 // Just checking that the cloneable flag is set correct
665 if (obj->is_array()) {
666 guarantee(klass->is_cloneable(), "all arrays are cloneable");
667 } else {
668 guarantee(obj->is_instance(), "should be instanceOop");
669 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
670 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
671 }
672 #endif
673
674 // Check if class of obj supports the Cloneable interface.
675 // All arrays are considered to be cloneable (See JLS 20.1.5).
676 // All j.l.r.Reference classes are considered non-cloneable.
677 if (!klass->is_cloneable() ||
678 (klass->is_instance_klass() &&
679 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
680 ResourceMark rm(THREAD);
681 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
682 }
683
684 // Make shallow object copy
685 const int size = obj->size();
686 oop new_obj_oop = NULL;
687 if (obj->is_array()) {
688 const int length = ((arrayOop)obj())->length();
689 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
690 /* do_zero */ true, CHECK_NULL);
691 } else {
692 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
693 }
694
695 HeapAccess<>::clone(obj(), new_obj_oop, size);
696
697 Handle new_obj(THREAD, new_obj_oop);
698 // Caution: this involves a java upcall, so the clone should be
699 // "gc-robust" by this stage.
700 if (klass->has_finalizer()) {
701 assert(obj->is_instance(), "should be instanceOop");
702 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
703 new_obj = Handle(THREAD, new_obj_oop);
704 }
705
706 return JNIHandles::make_local(env, new_obj());
707 JVM_END
708
709 // java.io.File ///////////////////////////////////////////////////////////////
710
711 JVM_LEAF(char*, JVM_NativePath(char* path))
712 JVMWrapper("JVM_NativePath");
713 return os::native_path(path);
714 JVM_END
715
716
717 // Misc. class handling ///////////////////////////////////////////////////////////
718
719
720 JVM_ENTRY(void, JVM_LinkClass(JNIEnv* env, jclass classClass, jclass arg))
721 JVMWrapper("JVM_LinkClass");
722
723 oop r = JNIHandles::resolve(arg);
724 Klass* klass = java_lang_Class::as_Klass(r);
725
726 if (!ClassForNameDeferLinking && klass->is_instance_klass()) {
727 InstanceKlass::cast(klass)->link_class(CHECK);
728 }
729 JVM_END
730
731 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
732 JVMWrapper("JVM_GetCallerClass");
733
734 // Getting the class of the caller frame.
735 //
736 // The call stack at this point looks something like this:
737 //
738 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
739 // [1] [ @CallerSensitive API.method ]
740 // [.] [ (skipped intermediate frames) ]
741 // [n] [ caller ]
742 vframeStream vfst(thread);
743 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
744 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
745 Method* m = vfst.method();
746 assert(m != NULL, "sanity");
747 switch (n) {
748 case 0:
749 // This must only be called from Reflection.getCallerClass
750 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
751 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
752 }
753 // fall-through
754 case 1:
755 // Frame 0 and 1 must be caller sensitive.
756 if (!m->caller_sensitive()) {
757 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
758 }
759 break;
760 default:
761 if (!m->is_ignored_by_security_stack_walk()) {
762 // We have reached the desired frame; return the holder class.
763 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
764 }
765 break;
766 }
767 }
768 return NULL;
769 JVM_END
770
771
772 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
773 JVMWrapper("JVM_FindPrimitiveClass");
774 oop mirror = NULL;
775 BasicType t = name2type(utf);
776 if (t != T_ILLEGAL && t != T_OBJECT && t != T_ARRAY) {
777 mirror = Universe::java_mirror(t);
778 }
779 if (mirror == NULL) {
780 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
781 } else {
782 return (jclass) JNIHandles::make_local(env, mirror);
783 }
784 JVM_END
785
786
787 // Returns a class loaded by the bootstrap class loader; or null
788 // if not found. ClassNotFoundException is not thrown.
789 // FindClassFromBootLoader is exported to the launcher for windows.
790 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
791 const char* name))
792 JVMWrapper("JVM_FindClassFromBootLoader");
793
794 // Java libraries should ensure that name is never null...
795 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
796 // It's impossible to create this class; the name cannot fit
797 // into the constant pool.
798 return NULL;
799 }
800
801 TempNewSymbol h_name = SymbolTable::new_symbol(name);
802 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
803 if (k == NULL) {
804 return NULL;
805 }
806
807 if (log_is_enabled(Debug, class, resolve)) {
808 trace_class_resolution(k);
809 }
810 return (jclass) JNIHandles::make_local(env, k->java_mirror());
811 JVM_END
812
813 // Find a class with this name in this loader, using the caller's protection domain.
814 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
815 jboolean init, jobject loader,
816 jclass caller))
817 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
818 // Java libraries should ensure that name is never null...
819 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
820 // It's impossible to create this class; the name cannot fit
821 // into the constant pool.
822 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), name);
823 }
824
825 TempNewSymbol h_name = SymbolTable::new_symbol(name);
826
827 oop loader_oop = JNIHandles::resolve(loader);
828 oop from_class = JNIHandles::resolve(caller);
829 oop protection_domain = NULL;
830 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
831 // NPE. Put it in another way, the bootstrap class loader has all permission and
832 // thus no checkPackageAccess equivalence in the VM class loader.
833 // The caller is also passed as NULL by the java code if there is no security
834 // manager to avoid the performance cost of getting the calling class.
835 if (from_class != NULL && loader_oop != NULL) {
836 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
837 }
838
839 Handle h_loader(THREAD, loader_oop);
840 Handle h_prot(THREAD, protection_domain);
841
842 jboolean link = !ClassForNameDeferLinking;
843 jclass result = find_class_from_class_loader(env, h_name, init, link, h_loader,
844 h_prot, false, THREAD);
845 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
846 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
847 }
848 return result;
849 JVM_END
850
851 // Currently only called from the old verifier.
852 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
853 jboolean init, jclass from))
854 JVMWrapper("JVM_FindClassFromClass");
855 if (name == NULL) {
856 THROW_MSG_0(vmSymbols::java_lang_NoClassDefFoundError(), "No class name given");
857 }
858 if ((int)strlen(name) > Symbol::max_length()) {
859 // It's impossible to create this class; the name cannot fit
860 // into the constant pool.
861 Exceptions::fthrow(THREAD_AND_LOCATION,
862 vmSymbols::java_lang_NoClassDefFoundError(),
863 "Class name exceeds maximum length of %d: %s",
864 Symbol::max_length(),
865 name);
866 return 0;
867 }
868 TempNewSymbol h_name = SymbolTable::new_symbol(name);
869 oop from_class_oop = JNIHandles::resolve(from);
870 Klass* from_class = (from_class_oop == NULL)
871 ? (Klass*)NULL
872 : java_lang_Class::as_Klass(from_class_oop);
873 oop class_loader = NULL;
874 oop protection_domain = NULL;
875 if (from_class != NULL) {
876 class_loader = from_class->class_loader();
877 protection_domain = from_class->protection_domain();
878 }
879 Handle h_loader(THREAD, class_loader);
880 Handle h_prot (THREAD, protection_domain);
881 jclass result = find_class_from_class_loader(env, h_name, init, false, h_loader,
882 h_prot, true, thread);
883
884 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
885 // this function is generally only used for class loading during verification.
886 ResourceMark rm;
887 oop from_mirror = JNIHandles::resolve_non_null(from);
888 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
889 const char * from_name = from_class->external_name();
890
891 oop mirror = JNIHandles::resolve_non_null(result);
892 Klass* to_class = java_lang_Class::as_Klass(mirror);
893 const char * to = to_class->external_name();
894 log_debug(class, resolve)("%s %s (verification)", from_name, to);
895 }
896
897 return result;
898 JVM_END
899
900 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
901 if (loader.is_null()) {
902 return;
903 }
904
905 // check whether the current caller thread holds the lock or not.
906 // If not, increment the corresponding counter
907 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
908 ObjectSynchronizer::owner_self) {
909 counter->inc();
910 }
911 }
912
913 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
914 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
915 jobject loader, const jbyte *buf,
916 jsize len, jobject pd, const char *source,
917 TRAPS) {
918 if (source == NULL) source = "__JVM_DefineClass__";
919
920 assert(THREAD->is_Java_thread(), "must be a JavaThread");
921 JavaThread* jt = (JavaThread*) THREAD;
922
923 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
924 ClassLoader::perf_define_appclass_selftime(),
925 ClassLoader::perf_define_appclasses(),
926 jt->get_thread_stat()->perf_recursion_counts_addr(),
927 jt->get_thread_stat()->perf_timers_addr(),
928 PerfClassTraceTime::DEFINE_CLASS);
929
930 if (UsePerfData) {
931 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
932 }
933
934 // Since exceptions can be thrown, class initialization can take place
935 // if name is NULL no check for class name in .class stream has to be made.
936 TempNewSymbol class_name = NULL;
937 if (name != NULL) {
938 const int str_len = (int)strlen(name);
939 if (str_len > Symbol::max_length()) {
940 // It's impossible to create this class; the name cannot fit
941 // into the constant pool.
942 Exceptions::fthrow(THREAD_AND_LOCATION,
943 vmSymbols::java_lang_NoClassDefFoundError(),
944 "Class name exceeds maximum length of %d: %s",
945 Symbol::max_length(),
946 name);
947 return 0;
948 }
949 class_name = SymbolTable::new_symbol(name, str_len);
950 }
951
952 ResourceMark rm(THREAD);
953 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
954 Handle class_loader (THREAD, JNIHandles::resolve(loader));
955 if (UsePerfData) {
956 is_lock_held_by_thread(class_loader,
957 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
958 THREAD);
959 }
960 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
961 Klass* k = SystemDictionary::resolve_from_stream(class_name,
962 class_loader,
963 protection_domain,
964 &st,
965 CHECK_NULL);
966
967 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
968 trace_class_resolution(k);
969 }
970
971 return (jclass) JNIHandles::make_local(env, k->java_mirror());
972 }
973
974
975 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
976 JVMWrapper("JVM_DefineClass");
977
978 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
979 JVM_END
980
981
982 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
983 JVMWrapper("JVM_DefineClassWithSource");
984
985 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
986 JVM_END
987
988 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
989 JVMWrapper("JVM_FindLoadedClass");
990 ResourceMark rm(THREAD);
991
992 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
993 Handle string = java_lang_String::internalize_classname(h_name, CHECK_NULL);
994
995 const char* str = java_lang_String::as_utf8_string(string());
996 // Sanity check, don't expect null
997 if (str == NULL) return NULL;
998
999 const int str_len = (int)strlen(str);
1000 if (str_len > Symbol::max_length()) {
1001 // It's impossible to create this class; the name cannot fit
1002 // into the constant pool.
1003 return NULL;
1004 }
1005 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1006
1007 // Security Note:
1008 // The Java level wrapper will perform the necessary security check allowing
1009 // us to pass the NULL as the initiating class loader.
1010 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1011 if (UsePerfData) {
1012 is_lock_held_by_thread(h_loader,
1013 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1014 THREAD);
1015 }
1016
1017 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1018 h_loader,
1019 Handle(),
1020 CHECK_NULL);
1021 #if INCLUDE_CDS
1022 if (k == NULL) {
1023 // If the class is not already loaded, try to see if it's in the shared
1024 // archive for the current classloader (h_loader).
1025 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1026 }
1027 #endif
1028 return (k == NULL) ? NULL :
1029 (jclass) JNIHandles::make_local(env, k->java_mirror());
1030 JVM_END
1031
1032 // Module support //////////////////////////////////////////////////////////////////////////////
1033
1034 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1035 jstring location, const char* const* packages, jsize num_packages))
1036 JVMWrapper("JVM_DefineModule");
1037 Modules::define_module(module, is_open, version, location, packages, num_packages, CHECK);
1038 JVM_END
1039
1040 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1041 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1042 Modules::set_bootloader_unnamed_module(module, CHECK);
1043 JVM_END
1044
1045 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, const char* package, jobject to_module))
1046 JVMWrapper("JVM_AddModuleExports");
1047 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1048 JVM_END
1049
1050 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, const char* package))
1051 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1052 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1053 JVM_END
1054
1055 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, const char* package))
1056 JVMWrapper("JVM_AddModuleExportsToAll");
1057 Modules::add_module_exports(from_module, package, NULL, CHECK);
1058 JVM_END
1059
1060 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1061 JVMWrapper("JVM_AddReadsModule");
1062 Modules::add_reads_module(from_module, source_module, CHECK);
1063 JVM_END
1064
1065 // Reflection support //////////////////////////////////////////////////////////////////////////////
1066
1067 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1068 assert (cls != NULL, "illegal class");
1069 JVMWrapper("JVM_InitClassName");
1070 JvmtiVMObjectAllocEventCollector oam;
1071 ResourceMark rm(THREAD);
1072 HandleMark hm(THREAD);
1073 Handle java_class(THREAD, JNIHandles::resolve(cls));
1074 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1075 return (jstring) JNIHandles::make_local(env, result);
1076 JVM_END
1077
1078
1079 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1080 JVMWrapper("JVM_GetClassInterfaces");
1081 JvmtiVMObjectAllocEventCollector oam;
1082 oop mirror = JNIHandles::resolve_non_null(cls);
1083
1084 // Special handling for primitive objects
1085 if (java_lang_Class::is_primitive(mirror)) {
1086 // Primitive objects does not have any interfaces
1087 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1088 return (jobjectArray) JNIHandles::make_local(env, r);
1089 }
1090
1091 Klass* klass = java_lang_Class::as_Klass(mirror);
1092 // Figure size of result array
1093 int size;
1094 if (klass->is_instance_klass()) {
1095 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1096 } else {
1097 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1098 size = 2;
1099 }
1100
1101 // Allocate result array
1102 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1103 objArrayHandle result (THREAD, r);
1104 // Fill in result
1105 if (klass->is_instance_klass()) {
1106 // Regular instance klass, fill in all local interfaces
1107 for (int index = 0; index < size; index++) {
1108 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1109 result->obj_at_put(index, k->java_mirror());
1110 }
1111 } else {
1112 // All arrays implement java.lang.Cloneable and java.io.Serializable
1113 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1114 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1115 }
1116 return (jobjectArray) JNIHandles::make_local(env, result());
1117 JVM_END
1118
1119
1120 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1121 JVMWrapper("JVM_IsInterface");
1122 oop mirror = JNIHandles::resolve_non_null(cls);
1123 if (java_lang_Class::is_primitive(mirror)) {
1124 return JNI_FALSE;
1125 }
1126 Klass* k = java_lang_Class::as_Klass(mirror);
1127 jboolean result = k->is_interface();
1128 assert(!result || k->is_instance_klass(),
1129 "all interfaces are instance types");
1130 // The compiler intrinsic for isInterface tests the
1131 // Klass::_access_flags bits in the same way.
1132 return result;
1133 JVM_END
1134
1135
1136 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1137 JVMWrapper("JVM_GetClassSigners");
1138 JvmtiVMObjectAllocEventCollector oam;
1139 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1140 // There are no signers for primitive types
1141 return NULL;
1142 }
1143
1144 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1145
1146 // If there are no signers set in the class, or if the class
1147 // is an array, return NULL.
1148 if (signers == NULL) return NULL;
1149
1150 // copy of the signers array
1151 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1152 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1153 for (int index = 0; index < signers->length(); index++) {
1154 signers_copy->obj_at_put(index, signers->obj_at(index));
1155 }
1156
1157 // return the copy
1158 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1159 JVM_END
1160
1161
1162 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1163 JVMWrapper("JVM_SetClassSigners");
1164 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1165 // This call is ignored for primitive types and arrays.
1166 // Signers are only set once, ClassLoader.java, and thus shouldn't
1167 // be called with an array. Only the bootstrap loader creates arrays.
1168 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1169 if (k->is_instance_klass()) {
1170 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1171 }
1172 }
1173 JVM_END
1174
1175
1176 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1177 JVMWrapper("JVM_GetProtectionDomain");
1178 if (JNIHandles::resolve(cls) == NULL) {
1179 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1180 }
1181
1182 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1183 // Primitive types does not have a protection domain.
1184 return NULL;
1185 }
1186
1187 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1188 return (jobject) JNIHandles::make_local(env, pd);
1189 JVM_END
1190
1191
1192 // Returns the inherited_access_control_context field of the running thread.
1193 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1194 JVMWrapper("JVM_GetInheritedAccessControlContext");
1195 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1196 return JNIHandles::make_local(env, result);
1197 JVM_END
1198
1199 class RegisterArrayForGC {
1200 private:
1201 JavaThread *_thread;
1202 public:
1203 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1204 _thread = thread;
1205 _thread->register_array_for_gc(array);
1206 }
1207
1208 ~RegisterArrayForGC() {
1209 _thread->register_array_for_gc(NULL);
1210 }
1211 };
1212
1213
1214 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1215 JVMWrapper("JVM_GetStackAccessControlContext");
1216 if (!UsePrivilegedStack) return NULL;
1217
1218 ResourceMark rm(THREAD);
1219 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1220 JvmtiVMObjectAllocEventCollector oam;
1221
1222 // count the protection domains on the execution stack. We collapse
1223 // duplicate consecutive protection domains into a single one, as
1224 // well as stopping when we hit a privileged frame.
1225
1226 oop previous_protection_domain = NULL;
1227 Handle privileged_context(thread, NULL);
1228 bool is_privileged = false;
1229 oop protection_domain = NULL;
1230
1231 // Iterate through Java frames
1232 vframeStream vfst(thread);
1233 for(; !vfst.at_end(); vfst.next()) {
1234 // get method of frame
1235 Method* method = vfst.method();
1236
1237 // stop at the first privileged frame
1238 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1239 method->name() == vmSymbols::executePrivileged_name())
1240 {
1241 // this frame is privileged
1242 is_privileged = true;
1243
1244 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1245
1246 StackValueCollection* locals = priv->locals();
1247 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1248 StackValue* clr_sv = locals->at(2); // Class<?> caller
1249 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1250 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1251 privileged_context = ctx_sv->get_obj();
1252 Handle caller = clr_sv->get_obj();
1253
1254 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1255 protection_domain = caller_klass->protection_domain();
1256 } else {
1257 protection_domain = method->method_holder()->protection_domain();
1258 }
1259
1260 if ((!oopDesc::equals(previous_protection_domain, protection_domain)) && (protection_domain != NULL)) {
1261 local_array->push(protection_domain);
1262 previous_protection_domain = protection_domain;
1263 }
1264
1265 if (is_privileged) break;
1266 }
1267
1268
1269 // either all the domains on the stack were system domains, or
1270 // we had a privileged system domain
1271 if (local_array->is_empty()) {
1272 if (is_privileged && privileged_context.is_null()) return NULL;
1273
1274 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1275 return JNIHandles::make_local(env, result);
1276 }
1277
1278 // the resource area must be registered in case of a gc
1279 RegisterArrayForGC ragc(thread, local_array);
1280 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1281 local_array->length(), CHECK_NULL);
1282 objArrayHandle h_context(thread, context);
1283 for (int index = 0; index < local_array->length(); index++) {
1284 h_context->obj_at_put(index, local_array->at(index));
1285 }
1286
1287 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1288
1289 return JNIHandles::make_local(env, result);
1290 JVM_END
1291
1292
1293 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1294 JVMWrapper("JVM_IsArrayClass");
1295 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1296 return (k != NULL) && k->is_array_klass() ? true : false;
1297 JVM_END
1298
1299
1300 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1301 JVMWrapper("JVM_IsPrimitiveClass");
1302 oop mirror = JNIHandles::resolve_non_null(cls);
1303 return (jboolean) java_lang_Class::is_primitive(mirror);
1304 JVM_END
1305
1306
1307 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1308 JVMWrapper("JVM_GetClassModifiers");
1309 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1310 // Primitive type
1311 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1312 }
1313
1314 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1315 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1316 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1317 return k->modifier_flags();
1318 JVM_END
1319
1320
1321 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1322
1323 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1324 JvmtiVMObjectAllocEventCollector oam;
1325 // ofClass is a reference to a java_lang_Class object. The mirror object
1326 // of an InstanceKlass
1327
1328 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1329 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1330 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1331 return (jobjectArray)JNIHandles::make_local(env, result);
1332 }
1333
1334 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1335 InnerClassesIterator iter(k);
1336
1337 if (iter.length() == 0) {
1338 // Neither an inner nor outer class
1339 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1340 return (jobjectArray)JNIHandles::make_local(env, result);
1341 }
1342
1343 // find inner class info
1344 constantPoolHandle cp(thread, k->constants());
1345 int length = iter.length();
1346
1347 // Allocate temp. result array
1348 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1349 objArrayHandle result (THREAD, r);
1350 int members = 0;
1351
1352 for (; !iter.done(); iter.next()) {
1353 int ioff = iter.inner_class_info_index();
1354 int ooff = iter.outer_class_info_index();
1355
1356 if (ioff != 0 && ooff != 0) {
1357 // Check to see if the name matches the class we're looking for
1358 // before attempting to find the class.
1359 if (cp->klass_name_at_matches(k, ooff)) {
1360 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1361 if (outer_klass == k) {
1362 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1363 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1364
1365 // Throws an exception if outer klass has not declared k as
1366 // an inner klass
1367 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1368
1369 result->obj_at_put(members, inner_klass->java_mirror());
1370 members++;
1371 }
1372 }
1373 }
1374 }
1375
1376 if (members != length) {
1377 // Return array of right length
1378 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1379 for(int i = 0; i < members; i++) {
1380 res->obj_at_put(i, result->obj_at(i));
1381 }
1382 return (jobjectArray)JNIHandles::make_local(env, res);
1383 }
1384
1385 return (jobjectArray)JNIHandles::make_local(env, result());
1386 JVM_END
1387
1388
1389 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1390 {
1391 // ofClass is a reference to a java_lang_Class object.
1392 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1393 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1394 return NULL;
1395 }
1396
1397 bool inner_is_member = false;
1398 Klass* outer_klass
1399 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1400 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1401 if (outer_klass == NULL) return NULL; // already a top-level class
1402 if (!inner_is_member) return NULL; // an anonymous class (inside a method)
1403 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1404 }
1405 JVM_END
1406
1407 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1408 {
1409 oop mirror = JNIHandles::resolve_non_null(cls);
1410 if (java_lang_Class::is_primitive(mirror) ||
1411 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1412 return NULL;
1413 }
1414 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1415 int ooff = 0, noff = 0;
1416 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1417 if (noff != 0) {
1418 constantPoolHandle i_cp(thread, k->constants());
1419 Symbol* name = i_cp->symbol_at(noff);
1420 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1421 return (jstring) JNIHandles::make_local(env, str());
1422 }
1423 }
1424 return NULL;
1425 }
1426 JVM_END
1427
1428 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1429 assert (cls != NULL, "illegal class");
1430 JVMWrapper("JVM_GetClassSignature");
1431 JvmtiVMObjectAllocEventCollector oam;
1432 ResourceMark rm(THREAD);
1433 // Return null for arrays and primatives
1434 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1435 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1436 if (k->is_instance_klass()) {
1437 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1438 if (sym == NULL) return NULL;
1439 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1440 return (jstring) JNIHandles::make_local(env, str());
1441 }
1442 }
1443 return NULL;
1444 JVM_END
1445
1446
1447 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1448 assert (cls != NULL, "illegal class");
1449 JVMWrapper("JVM_GetClassAnnotations");
1450
1451 // Return null for arrays and primitives
1452 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1453 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1454 if (k->is_instance_klass()) {
1455 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1456 return (jbyteArray) JNIHandles::make_local(env, a);
1457 }
1458 }
1459 return NULL;
1460 JVM_END
1461
1462
1463 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1464 // some of this code was adapted from from jni_FromReflectedField
1465
1466 oop reflected = JNIHandles::resolve_non_null(field);
1467 oop mirror = java_lang_reflect_Field::clazz(reflected);
1468 Klass* k = java_lang_Class::as_Klass(mirror);
1469 int slot = java_lang_reflect_Field::slot(reflected);
1470 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1471
1472 InstanceKlass* ik = InstanceKlass::cast(k);
1473 intptr_t offset = ik->field_offset(slot);
1474
1475 if (modifiers & JVM_ACC_STATIC) {
1476 // for static fields we only look in the current class
1477 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1478 assert(false, "cannot find static field");
1479 return false;
1480 }
1481 } else {
1482 // for instance fields we start with the current class and work
1483 // our way up through the superclass chain
1484 if (!ik->find_field_from_offset(offset, false, &fd)) {
1485 assert(false, "cannot find instance field");
1486 return false;
1487 }
1488 }
1489 return true;
1490 }
1491
1492 static Method* jvm_get_method_common(jobject method) {
1493 // some of this code was adapted from from jni_FromReflectedMethod
1494
1495 oop reflected = JNIHandles::resolve_non_null(method);
1496 oop mirror = NULL;
1497 int slot = 0;
1498
1499 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1500 mirror = java_lang_reflect_Constructor::clazz(reflected);
1501 slot = java_lang_reflect_Constructor::slot(reflected);
1502 } else {
1503 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1504 "wrong type");
1505 mirror = java_lang_reflect_Method::clazz(reflected);
1506 slot = java_lang_reflect_Method::slot(reflected);
1507 }
1508 Klass* k = java_lang_Class::as_Klass(mirror);
1509
1510 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1511 assert(m != NULL, "cannot find method");
1512 return m; // caller has to deal with NULL in product mode
1513 }
1514
1515 /* Type use annotations support (JDK 1.8) */
1516
1517 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1518 assert (cls != NULL, "illegal class");
1519 JVMWrapper("JVM_GetClassTypeAnnotations");
1520 ResourceMark rm(THREAD);
1521 // Return null for arrays and primitives
1522 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1523 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1524 if (k->is_instance_klass()) {
1525 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1526 if (type_annotations != NULL) {
1527 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1528 return (jbyteArray) JNIHandles::make_local(env, a);
1529 }
1530 }
1531 }
1532 return NULL;
1533 JVM_END
1534
1535 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1536 assert (method != NULL, "illegal method");
1537 JVMWrapper("JVM_GetMethodTypeAnnotations");
1538
1539 // method is a handle to a java.lang.reflect.Method object
1540 Method* m = jvm_get_method_common(method);
1541 if (m == NULL) {
1542 return NULL;
1543 }
1544
1545 AnnotationArray* type_annotations = m->type_annotations();
1546 if (type_annotations != NULL) {
1547 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1548 return (jbyteArray) JNIHandles::make_local(env, a);
1549 }
1550
1551 return NULL;
1552 JVM_END
1553
1554 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1555 assert (field != NULL, "illegal field");
1556 JVMWrapper("JVM_GetFieldTypeAnnotations");
1557
1558 fieldDescriptor fd;
1559 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1560 if (!gotFd) {
1561 return NULL;
1562 }
1563
1564 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1565 JVM_END
1566
1567 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1568 if (!cp->is_within_bounds(index)) {
1569 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1570 }
1571 }
1572
1573 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1574 {
1575 JVMWrapper("JVM_GetMethodParameters");
1576 // method is a handle to a java.lang.reflect.Method object
1577 Method* method_ptr = jvm_get_method_common(method);
1578 methodHandle mh (THREAD, method_ptr);
1579 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1580 const int num_params = mh->method_parameters_length();
1581
1582 if (num_params < 0) {
1583 // A -1 return value from method_parameters_length means there is no
1584 // parameter data. Return null to indicate this to the reflection
1585 // API.
1586 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1587 return (jobjectArray)NULL;
1588 } else {
1589 // Otherwise, we return something up to reflection, even if it is
1590 // a zero-length array. Why? Because in some cases this can
1591 // trigger a MalformedParametersException.
1592
1593 // make sure all the symbols are properly formatted
1594 for (int i = 0; i < num_params; i++) {
1595 MethodParametersElement* params = mh->method_parameters_start();
1596 int index = params[i].name_cp_index;
1597 bounds_check(mh->constants(), index, CHECK_NULL);
1598
1599 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1600 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1601 "Wrong type at constant pool index");
1602 }
1603
1604 }
1605
1606 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1607 objArrayHandle result (THREAD, result_oop);
1608
1609 for (int i = 0; i < num_params; i++) {
1610 MethodParametersElement* params = mh->method_parameters_start();
1611 // For a 0 index, give a NULL symbol
1612 Symbol* sym = 0 != params[i].name_cp_index ?
1613 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1614 int flags = params[i].flags;
1615 oop param = Reflection::new_parameter(reflected_method, i, sym,
1616 flags, CHECK_NULL);
1617 result->obj_at_put(i, param);
1618 }
1619 return (jobjectArray)JNIHandles::make_local(env, result());
1620 }
1621 }
1622 JVM_END
1623
1624 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1625
1626 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1627 {
1628 JVMWrapper("JVM_GetClassDeclaredFields");
1629 JvmtiVMObjectAllocEventCollector oam;
1630
1631 // Exclude primitive types and array types
1632 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1633 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1634 // Return empty array
1635 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1636 return (jobjectArray) JNIHandles::make_local(env, res);
1637 }
1638
1639 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1640 constantPoolHandle cp(THREAD, k->constants());
1641
1642 // Ensure class is linked
1643 k->link_class(CHECK_NULL);
1644
1645 // Allocate result
1646 int num_fields;
1647
1648 if (publicOnly) {
1649 num_fields = 0;
1650 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1651 if (fs.access_flags().is_public()) ++num_fields;
1652 }
1653 } else {
1654 num_fields = k->java_fields_count();
1655 }
1656
1657 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1658 objArrayHandle result (THREAD, r);
1659
1660 int out_idx = 0;
1661 fieldDescriptor fd;
1662 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1663 if (!publicOnly || fs.access_flags().is_public()) {
1664 fd.reinitialize(k, fs.index());
1665 oop field = Reflection::new_field(&fd, CHECK_NULL);
1666 result->obj_at_put(out_idx, field);
1667 ++out_idx;
1668 }
1669 }
1670 assert(out_idx == num_fields, "just checking");
1671 return (jobjectArray) JNIHandles::make_local(env, result());
1672 }
1673 JVM_END
1674
1675 static bool select_method(const methodHandle& method, bool want_constructor) {
1676 if (want_constructor) {
1677 return (method->is_initializer() && !method->is_static());
1678 } else {
1679 return (!method->is_initializer() && !method->is_overpass());
1680 }
1681 }
1682
1683 static jobjectArray get_class_declared_methods_helper(
1684 JNIEnv *env,
1685 jclass ofClass, jboolean publicOnly,
1686 bool want_constructor,
1687 Klass* klass, TRAPS) {
1688
1689 JvmtiVMObjectAllocEventCollector oam;
1690
1691 // Exclude primitive types and array types
1692 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1693 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1694 // Return empty array
1695 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1696 return (jobjectArray) JNIHandles::make_local(env, res);
1697 }
1698
1699 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1700
1701 // Ensure class is linked
1702 k->link_class(CHECK_NULL);
1703
1704 Array<Method*>* methods = k->methods();
1705 int methods_length = methods->length();
1706
1707 // Save original method_idnum in case of redefinition, which can change
1708 // the idnum of obsolete methods. The new method will have the same idnum
1709 // but if we refresh the methods array, the counts will be wrong.
1710 ResourceMark rm(THREAD);
1711 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1712 int num_methods = 0;
1713
1714 for (int i = 0; i < methods_length; i++) {
1715 methodHandle method(THREAD, methods->at(i));
1716 if (select_method(method, want_constructor)) {
1717 if (!publicOnly || method->is_public()) {
1718 idnums->push(method->method_idnum());
1719 ++num_methods;
1720 }
1721 }
1722 }
1723
1724 // Allocate result
1725 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1726 objArrayHandle result (THREAD, r);
1727
1728 // Now just put the methods that we selected above, but go by their idnum
1729 // in case of redefinition. The methods can be redefined at any safepoint,
1730 // so above when allocating the oop array and below when creating reflect
1731 // objects.
1732 for (int i = 0; i < num_methods; i++) {
1733 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1734 if (method.is_null()) {
1735 // Method may have been deleted and seems this API can handle null
1736 // Otherwise should probably put a method that throws NSME
1737 result->obj_at_put(i, NULL);
1738 } else {
1739 oop m;
1740 if (want_constructor) {
1741 m = Reflection::new_constructor(method, CHECK_NULL);
1742 } else {
1743 m = Reflection::new_method(method, false, CHECK_NULL);
1744 }
1745 result->obj_at_put(i, m);
1746 }
1747 }
1748
1749 return (jobjectArray) JNIHandles::make_local(env, result());
1750 }
1751
1752 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1753 {
1754 JVMWrapper("JVM_GetClassDeclaredMethods");
1755 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1756 /*want_constructor*/ false,
1757 SystemDictionary::reflect_Method_klass(), THREAD);
1758 }
1759 JVM_END
1760
1761 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1762 {
1763 JVMWrapper("JVM_GetClassDeclaredConstructors");
1764 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1765 /*want_constructor*/ true,
1766 SystemDictionary::reflect_Constructor_klass(), THREAD);
1767 }
1768 JVM_END
1769
1770 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1771 {
1772 JVMWrapper("JVM_GetClassAccessFlags");
1773 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1774 // Primitive type
1775 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1776 }
1777
1778 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1779 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1780 }
1781 JVM_END
1782
1783 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1784 {
1785 JVMWrapper("JVM_AreNestMates");
1786 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1787 assert(c->is_instance_klass(), "must be");
1788 InstanceKlass* ck = InstanceKlass::cast(c);
1789 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1790 assert(m->is_instance_klass(), "must be");
1791 InstanceKlass* mk = InstanceKlass::cast(m);
1792 return ck->has_nestmate_access_to(mk, THREAD);
1793 }
1794 JVM_END
1795
1796 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1797 {
1798 // current is not a primitive or array class
1799 JVMWrapper("JVM_GetNestHost");
1800 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1801 assert(c->is_instance_klass(), "must be");
1802 InstanceKlass* ck = InstanceKlass::cast(c);
1803 // Don't post exceptions if validation fails
1804 InstanceKlass* host = ck->nest_host(NULL, THREAD);
1805 return (jclass) (host == NULL ? NULL :
1806 JNIHandles::make_local(THREAD, host->java_mirror()));
1807 }
1808 JVM_END
1809
1810 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1811 {
1812 // current is not a primitive or array class
1813 JVMWrapper("JVM_GetNestMembers");
1814 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1815 assert(c->is_instance_klass(), "must be");
1816 InstanceKlass* ck = InstanceKlass::cast(c);
1817 // Get the nest host for this nest - throw ICCE if validation fails
1818 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
1819 InstanceKlass* host = ck->nest_host(icce, CHECK_NULL);
1820
1821 {
1822 JvmtiVMObjectAllocEventCollector oam;
1823 Array<u2>* members = host->nest_members();
1824 int length = members == NULL ? 0 : members->length();
1825 // nest host is first in the array so make it one bigger
1826 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
1827 length + 1, CHECK_NULL);
1828 objArrayHandle result (THREAD, r);
1829 result->obj_at_put(0, host->java_mirror());
1830 if (length != 0) {
1831 int i;
1832 for (i = 0; i < length; i++) {
1833 int cp_index = members->at(i);
1834 Klass* k = host->constants()->klass_at(cp_index, CHECK_NULL);
1835 if (k->is_instance_klass()) {
1836 InstanceKlass* nest_host_k =
1837 InstanceKlass::cast(k)->nest_host(icce, CHECK_NULL);
1838 if (nest_host_k == host) {
1839 result->obj_at_put(i+1, k->java_mirror());
1840 }
1841 else {
1842 // k's nest host is legal but it isn't our host so
1843 // throw ICCE
1844 ResourceMark rm(THREAD);
1845 Exceptions::fthrow(THREAD_AND_LOCATION,
1846 icce,
1847 "Nest member %s in %s declares a different nest host of %s",
1848 k->external_name(),
1849 host->external_name(),
1850 nest_host_k->external_name()
1851 );
1852 return NULL;
1853 }
1854 }
1855 else {
1856 // we have a bad nest member entry - throw ICCE
1857 ResourceMark rm(THREAD);
1858 Exceptions::fthrow(THREAD_AND_LOCATION,
1859 icce,
1860 "Class %s can not be a nest member of %s",
1861 k->external_name(),
1862 host->external_name()
1863 );
1864 return NULL;
1865 }
1866 }
1867 }
1868 else {
1869 assert(host == ck, "must be singleton nest");
1870 }
1871 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1872 }
1873 }
1874 JVM_END
1875
1876 // Constant pool access //////////////////////////////////////////////////////////
1877
1878 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
1879 {
1880 JVMWrapper("JVM_GetClassConstantPool");
1881 JvmtiVMObjectAllocEventCollector oam;
1882
1883 // Return null for primitives and arrays
1884 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1885 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1886 if (k->is_instance_klass()) {
1887 InstanceKlass* k_h = InstanceKlass::cast(k);
1888 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
1889 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
1890 return JNIHandles::make_local(jcp());
1891 }
1892 }
1893 return NULL;
1894 }
1895 JVM_END
1896
1897
1898 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
1899 {
1900 JVMWrapper("JVM_ConstantPoolGetSize");
1901 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1902 return cp->length();
1903 }
1904 JVM_END
1905
1906
1907 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1908 {
1909 JVMWrapper("JVM_ConstantPoolGetClassAt");
1910 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1911 bounds_check(cp, index, CHECK_NULL);
1912 constantTag tag = cp->tag_at(index);
1913 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1914 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1915 }
1916 Klass* k = cp->klass_at(index, CHECK_NULL);
1917 return (jclass) JNIHandles::make_local(k->java_mirror());
1918 }
1919 JVM_END
1920
1921 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1922 {
1923 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
1924 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1925 bounds_check(cp, index, CHECK_NULL);
1926 constantTag tag = cp->tag_at(index);
1927 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
1928 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1929 }
1930 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
1931 if (k == NULL) return NULL;
1932 return (jclass) JNIHandles::make_local(k->java_mirror());
1933 }
1934 JVM_END
1935
1936 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
1937 constantTag tag = cp->tag_at(index);
1938 if (!tag.is_method() && !tag.is_interface_method()) {
1939 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1940 }
1941 int klass_ref = cp->uncached_klass_ref_index_at(index);
1942 Klass* k_o;
1943 if (force_resolution) {
1944 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1945 } else {
1946 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1947 if (k_o == NULL) return NULL;
1948 }
1949 InstanceKlass* k = InstanceKlass::cast(k_o);
1950 Symbol* name = cp->uncached_name_ref_at(index);
1951 Symbol* sig = cp->uncached_signature_ref_at(index);
1952 methodHandle m (THREAD, k->find_method(name, sig));
1953 if (m.is_null()) {
1954 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
1955 }
1956 oop method;
1957 if (!m->is_initializer() || m->is_static()) {
1958 method = Reflection::new_method(m, true, CHECK_NULL);
1959 } else {
1960 method = Reflection::new_constructor(m, CHECK_NULL);
1961 }
1962 return JNIHandles::make_local(method);
1963 }
1964
1965 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
1966 {
1967 JVMWrapper("JVM_ConstantPoolGetMethodAt");
1968 JvmtiVMObjectAllocEventCollector oam;
1969 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1970 bounds_check(cp, index, CHECK_NULL);
1971 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
1972 return res;
1973 }
1974 JVM_END
1975
1976 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
1977 {
1978 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
1979 JvmtiVMObjectAllocEventCollector oam;
1980 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
1981 bounds_check(cp, index, CHECK_NULL);
1982 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
1983 return res;
1984 }
1985 JVM_END
1986
1987 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
1988 constantTag tag = cp->tag_at(index);
1989 if (!tag.is_field()) {
1990 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
1991 }
1992 int klass_ref = cp->uncached_klass_ref_index_at(index);
1993 Klass* k_o;
1994 if (force_resolution) {
1995 k_o = cp->klass_at(klass_ref, CHECK_NULL);
1996 } else {
1997 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
1998 if (k_o == NULL) return NULL;
1999 }
2000 InstanceKlass* k = InstanceKlass::cast(k_o);
2001 Symbol* name = cp->uncached_name_ref_at(index);
2002 Symbol* sig = cp->uncached_signature_ref_at(index);
2003 fieldDescriptor fd;
2004 Klass* target_klass = k->find_field(name, sig, &fd);
2005 if (target_klass == NULL) {
2006 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2007 }
2008 oop field = Reflection::new_field(&fd, CHECK_NULL);
2009 return JNIHandles::make_local(field);
2010 }
2011
2012 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2013 {
2014 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2015 JvmtiVMObjectAllocEventCollector oam;
2016 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2017 bounds_check(cp, index, CHECK_NULL);
2018 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2019 return res;
2020 }
2021 JVM_END
2022
2023 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2024 {
2025 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2026 JvmtiVMObjectAllocEventCollector oam;
2027 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2028 bounds_check(cp, index, CHECK_NULL);
2029 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2030 return res;
2031 }
2032 JVM_END
2033
2034 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2035 {
2036 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2037 JvmtiVMObjectAllocEventCollector oam;
2038 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2039 bounds_check(cp, index, CHECK_NULL);
2040 constantTag tag = cp->tag_at(index);
2041 if (!tag.is_field_or_method()) {
2042 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2043 }
2044 int klass_ref = cp->uncached_klass_ref_index_at(index);
2045 Symbol* klass_name = cp->klass_name_at(klass_ref);
2046 Symbol* member_name = cp->uncached_name_ref_at(index);
2047 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2048 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2049 objArrayHandle dest(THREAD, dest_o);
2050 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2051 dest->obj_at_put(0, str());
2052 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2053 dest->obj_at_put(1, str());
2054 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2055 dest->obj_at_put(2, str());
2056 return (jobjectArray) JNIHandles::make_local(dest());
2057 }
2058 JVM_END
2059
2060 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2061 {
2062 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2063 JvmtiVMObjectAllocEventCollector oam;
2064 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2065 bounds_check(cp, index, CHECK_0);
2066 constantTag tag = cp->tag_at(index);
2067 if (!tag.is_field_or_method()) {
2068 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2069 }
2070 return (jint) cp->uncached_klass_ref_index_at(index);
2071 }
2072 JVM_END
2073
2074 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2075 {
2076 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2077 JvmtiVMObjectAllocEventCollector oam;
2078 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2079 bounds_check(cp, index, CHECK_0);
2080 constantTag tag = cp->tag_at(index);
2081 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2082 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2083 }
2084 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2085 }
2086 JVM_END
2087
2088 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2089 {
2090 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2091 JvmtiVMObjectAllocEventCollector oam;
2092 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2093 bounds_check(cp, index, CHECK_NULL);
2094 constantTag tag = cp->tag_at(index);
2095 if (!tag.is_name_and_type()) {
2096 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2097 }
2098 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2099 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2100 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2101 objArrayHandle dest(THREAD, dest_o);
2102 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2103 dest->obj_at_put(0, str());
2104 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2105 dest->obj_at_put(1, str());
2106 return (jobjectArray) JNIHandles::make_local(dest());
2107 }
2108 JVM_END
2109
2110 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2111 {
2112 JVMWrapper("JVM_ConstantPoolGetIntAt");
2113 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2114 bounds_check(cp, index, CHECK_0);
2115 constantTag tag = cp->tag_at(index);
2116 if (!tag.is_int()) {
2117 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2118 }
2119 return cp->int_at(index);
2120 }
2121 JVM_END
2122
2123 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2124 {
2125 JVMWrapper("JVM_ConstantPoolGetLongAt");
2126 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2127 bounds_check(cp, index, CHECK_(0L));
2128 constantTag tag = cp->tag_at(index);
2129 if (!tag.is_long()) {
2130 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2131 }
2132 return cp->long_at(index);
2133 }
2134 JVM_END
2135
2136 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2137 {
2138 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2139 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2140 bounds_check(cp, index, CHECK_(0.0f));
2141 constantTag tag = cp->tag_at(index);
2142 if (!tag.is_float()) {
2143 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2144 }
2145 return cp->float_at(index);
2146 }
2147 JVM_END
2148
2149 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2150 {
2151 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2152 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2153 bounds_check(cp, index, CHECK_(0.0));
2154 constantTag tag = cp->tag_at(index);
2155 if (!tag.is_double()) {
2156 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2157 }
2158 return cp->double_at(index);
2159 }
2160 JVM_END
2161
2162 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2163 {
2164 JVMWrapper("JVM_ConstantPoolGetStringAt");
2165 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2166 bounds_check(cp, index, CHECK_NULL);
2167 constantTag tag = cp->tag_at(index);
2168 if (!tag.is_string()) {
2169 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2170 }
2171 oop str = cp->string_at(index, CHECK_NULL);
2172 return (jstring) JNIHandles::make_local(str);
2173 }
2174 JVM_END
2175
2176 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2177 {
2178 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2179 JvmtiVMObjectAllocEventCollector oam;
2180 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2181 bounds_check(cp, index, CHECK_NULL);
2182 constantTag tag = cp->tag_at(index);
2183 if (!tag.is_symbol()) {
2184 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2185 }
2186 Symbol* sym = cp->symbol_at(index);
2187 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2188 return (jstring) JNIHandles::make_local(str());
2189 }
2190 JVM_END
2191
2192 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2193 {
2194 JVMWrapper("JVM_ConstantPoolGetTagAt");
2195 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2196 bounds_check(cp, index, CHECK_0);
2197 constantTag tag = cp->tag_at(index);
2198 jbyte result = tag.value();
2199 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2200 // they are changed to the corresponding tags from the JVM spec, so that java code in
2201 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2202 if (tag.is_klass_or_reference()) {
2203 result = JVM_CONSTANT_Class;
2204 } else if (tag.is_string_index()) {
2205 result = JVM_CONSTANT_String;
2206 } else if (tag.is_method_type_in_error()) {
2207 result = JVM_CONSTANT_MethodType;
2208 } else if (tag.is_method_handle_in_error()) {
2209 result = JVM_CONSTANT_MethodHandle;
2210 } else if (tag.is_dynamic_constant_in_error()) {
2211 result = JVM_CONSTANT_Dynamic;
2212 }
2213 return result;
2214 }
2215 JVM_END
2216
2217 // Assertion support. //////////////////////////////////////////////////////////
2218
2219 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2220 JVMWrapper("JVM_DesiredAssertionStatus");
2221 assert(cls != NULL, "bad class");
2222
2223 oop r = JNIHandles::resolve(cls);
2224 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2225 if (java_lang_Class::is_primitive(r)) return false;
2226
2227 Klass* k = java_lang_Class::as_Klass(r);
2228 assert(k->is_instance_klass(), "must be an instance klass");
2229 if (!k->is_instance_klass()) return false;
2230
2231 ResourceMark rm(THREAD);
2232 const char* name = k->name()->as_C_string();
2233 bool system_class = k->class_loader() == NULL;
2234 return JavaAssertions::enabled(name, system_class);
2235
2236 JVM_END
2237
2238
2239 // Return a new AssertionStatusDirectives object with the fields filled in with
2240 // command-line assertion arguments (i.e., -ea, -da).
2241 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2242 JVMWrapper("JVM_AssertionStatusDirectives");
2243 JvmtiVMObjectAllocEventCollector oam;
2244 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2245 return JNIHandles::make_local(env, asd);
2246 JVM_END
2247
2248 // Verification ////////////////////////////////////////////////////////////////////////////////
2249
2250 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2251
2252 // RedefineClasses support: bug 6214132 caused verification to fail.
2253 // All functions from this section should call the jvmtiThreadSate function:
2254 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2255 // The function returns a Klass* of the _scratch_class if the verifier
2256 // was invoked in the middle of the class redefinition.
2257 // Otherwise it returns its argument value which is the _the_class Klass*.
2258 // Please, refer to the description in the jvmtiThreadSate.hpp.
2259
2260 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2261 JVMWrapper("JVM_GetClassNameUTF");
2262 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2263 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2264 return k->name()->as_utf8();
2265 JVM_END
2266
2267
2268 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2269 JVMWrapper("JVM_GetClassCPTypes");
2270 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2271 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2272 // types will have length zero if this is not an InstanceKlass
2273 // (length is determined by call to JVM_GetClassCPEntriesCount)
2274 if (k->is_instance_klass()) {
2275 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2276 for (int index = cp->length() - 1; index >= 0; index--) {
2277 constantTag tag = cp->tag_at(index);
2278 types[index] = (tag.is_unresolved_klass()) ? JVM_CONSTANT_Class : tag.value();
2279 }
2280 }
2281 JVM_END
2282
2283
2284 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2285 JVMWrapper("JVM_GetClassCPEntriesCount");
2286 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2287 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2288 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2289 JVM_END
2290
2291
2292 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2293 JVMWrapper("JVM_GetClassFieldsCount");
2294 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2295 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2296 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2297 JVM_END
2298
2299
2300 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2301 JVMWrapper("JVM_GetClassMethodsCount");
2302 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2303 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2304 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2305 JVM_END
2306
2307
2308 // The following methods, used for the verifier, are never called with
2309 // array klasses, so a direct cast to InstanceKlass is safe.
2310 // Typically, these methods are called in a loop with bounds determined
2311 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2312 // zero for arrays.
2313 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2314 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2315 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2316 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2317 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2318 int length = method->checked_exceptions_length();
2319 if (length > 0) {
2320 CheckedExceptionElement* table= method->checked_exceptions_start();
2321 for (int i = 0; i < length; i++) {
2322 exceptions[i] = table[i].class_cp_index;
2323 }
2324 }
2325 JVM_END
2326
2327
2328 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2329 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2330 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2331 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2332 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2333 return method->checked_exceptions_length();
2334 JVM_END
2335
2336
2337 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2338 JVMWrapper("JVM_GetMethodIxByteCode");
2339 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2340 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2341 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2342 memcpy(code, method->code_base(), method->code_size());
2343 JVM_END
2344
2345
2346 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2347 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2348 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2349 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2350 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2351 return method->code_size();
2352 JVM_END
2353
2354
2355 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2356 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2357 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2358 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2359 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2360 ExceptionTable extable(method);
2361 entry->start_pc = extable.start_pc(entry_index);
2362 entry->end_pc = extable.end_pc(entry_index);
2363 entry->handler_pc = extable.handler_pc(entry_index);
2364 entry->catchType = extable.catch_type_index(entry_index);
2365 JVM_END
2366
2367
2368 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2369 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2370 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2371 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2372 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2373 return method->exception_table_length();
2374 JVM_END
2375
2376
2377 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2378 JVMWrapper("JVM_GetMethodIxModifiers");
2379 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2380 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2381 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2382 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2383 JVM_END
2384
2385
2386 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2387 JVMWrapper("JVM_GetFieldIxModifiers");
2388 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2389 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2390 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2391 JVM_END
2392
2393
2394 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2395 JVMWrapper("JVM_GetMethodIxLocalsCount");
2396 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2397 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2398 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2399 return method->max_locals();
2400 JVM_END
2401
2402
2403 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2404 JVMWrapper("JVM_GetMethodIxArgsSize");
2405 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2406 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2407 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2408 return method->size_of_parameters();
2409 JVM_END
2410
2411
2412 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2413 JVMWrapper("JVM_GetMethodIxMaxStack");
2414 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2415 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2416 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2417 return method->verifier_max_stack();
2418 JVM_END
2419
2420
2421 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2422 JVMWrapper("JVM_IsConstructorIx");
2423 ResourceMark rm(THREAD);
2424 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2425 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2426 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2427 return method->name() == vmSymbols::object_initializer_name();
2428 JVM_END
2429
2430
2431 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2432 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2433 ResourceMark rm(THREAD);
2434 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2435 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2436 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2437 return method->is_overpass();
2438 JVM_END
2439
2440 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2441 JVMWrapper("JVM_GetMethodIxIxUTF");
2442 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2443 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2444 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2445 return method->name()->as_utf8();
2446 JVM_END
2447
2448
2449 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2450 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2451 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2452 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2453 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2454 return method->signature()->as_utf8();
2455 JVM_END
2456
2457 /**
2458 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2459 * read entries in the constant pool. Since the old verifier always
2460 * works on a copy of the code, it will not see any rewriting that
2461 * may possibly occur in the middle of verification. So it is important
2462 * that nothing it calls tries to use the cpCache instead of the raw
2463 * constant pool, so we must use cp->uncached_x methods when appropriate.
2464 */
2465 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2466 JVMWrapper("JVM_GetCPFieldNameUTF");
2467 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2468 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2469 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2470 switch (cp->tag_at(cp_index).value()) {
2471 case JVM_CONSTANT_Fieldref:
2472 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2473 default:
2474 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2475 }
2476 ShouldNotReachHere();
2477 return NULL;
2478 JVM_END
2479
2480
2481 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2482 JVMWrapper("JVM_GetCPMethodNameUTF");
2483 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2484 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2485 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2486 switch (cp->tag_at(cp_index).value()) {
2487 case JVM_CONSTANT_InterfaceMethodref:
2488 case JVM_CONSTANT_Methodref:
2489 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2490 default:
2491 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2492 }
2493 ShouldNotReachHere();
2494 return NULL;
2495 JVM_END
2496
2497
2498 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2499 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2500 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2501 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2502 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2503 switch (cp->tag_at(cp_index).value()) {
2504 case JVM_CONSTANT_InterfaceMethodref:
2505 case JVM_CONSTANT_Methodref:
2506 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2507 default:
2508 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2509 }
2510 ShouldNotReachHere();
2511 return NULL;
2512 JVM_END
2513
2514
2515 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2516 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2517 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2518 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2519 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2520 switch (cp->tag_at(cp_index).value()) {
2521 case JVM_CONSTANT_Fieldref:
2522 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2523 default:
2524 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2525 }
2526 ShouldNotReachHere();
2527 return NULL;
2528 JVM_END
2529
2530
2531 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2532 JVMWrapper("JVM_GetCPClassNameUTF");
2533 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2534 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2535 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2536 Symbol* classname = cp->klass_name_at(cp_index);
2537 return classname->as_utf8();
2538 JVM_END
2539
2540
2541 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2542 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2544 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2545 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2546 switch (cp->tag_at(cp_index).value()) {
2547 case JVM_CONSTANT_Fieldref: {
2548 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2549 Symbol* classname = cp->klass_name_at(class_index);
2550 return classname->as_utf8();
2551 }
2552 default:
2553 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2554 }
2555 ShouldNotReachHere();
2556 return NULL;
2557 JVM_END
2558
2559
2560 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2561 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2562 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2563 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2564 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2565 switch (cp->tag_at(cp_index).value()) {
2566 case JVM_CONSTANT_Methodref:
2567 case JVM_CONSTANT_InterfaceMethodref: {
2568 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2569 Symbol* classname = cp->klass_name_at(class_index);
2570 return classname->as_utf8();
2571 }
2572 default:
2573 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2574 }
2575 ShouldNotReachHere();
2576 return NULL;
2577 JVM_END
2578
2579
2580 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2581 JVMWrapper("JVM_GetCPFieldModifiers");
2582 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2583 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2584 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2585 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2586 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2587 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2588 switch (cp->tag_at(cp_index).value()) {
2589 case JVM_CONSTANT_Fieldref: {
2590 Symbol* name = cp->uncached_name_ref_at(cp_index);
2591 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2592 InstanceKlass* ik = InstanceKlass::cast(k_called);
2593 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2594 if (fs.name() == name && fs.signature() == signature) {
2595 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2596 }
2597 }
2598 return -1;
2599 }
2600 default:
2601 fatal("JVM_GetCPFieldModifiers: illegal constant");
2602 }
2603 ShouldNotReachHere();
2604 return 0;
2605 JVM_END
2606
2607
2608 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2609 JVMWrapper("JVM_GetCPMethodModifiers");
2610 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2611 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2612 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2613 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2614 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2615 switch (cp->tag_at(cp_index).value()) {
2616 case JVM_CONSTANT_Methodref:
2617 case JVM_CONSTANT_InterfaceMethodref: {
2618 Symbol* name = cp->uncached_name_ref_at(cp_index);
2619 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2620 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2621 int methods_count = methods->length();
2622 for (int i = 0; i < methods_count; i++) {
2623 Method* method = methods->at(i);
2624 if (method->name() == name && method->signature() == signature) {
2625 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2626 }
2627 }
2628 return -1;
2629 }
2630 default:
2631 fatal("JVM_GetCPMethodModifiers: illegal constant");
2632 }
2633 ShouldNotReachHere();
2634 return 0;
2635 JVM_END
2636
2637
2638 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2639
2640 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2641 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2642 JVM_END
2643
2644
2645 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2646 JVMWrapper("JVM_IsSameClassPackage");
2647 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2648 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2649 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2650 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2651 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2652 JVM_END
2653
2654 // Printing support //////////////////////////////////////////////////
2655 extern "C" {
2656
2657 ATTRIBUTE_PRINTF(3, 0)
2658 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2659 // Reject count values that are negative signed values converted to
2660 // unsigned; see bug 4399518, 4417214
2661 if ((intptr_t)count <= 0) return -1;
2662
2663 int result = os::vsnprintf(str, count, fmt, args);
2664 if (result > 0 && (size_t)result >= count) {
2665 result = -1;
2666 }
2667
2668 return result;
2669 }
2670
2671 ATTRIBUTE_PRINTF(3, 4)
2672 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2673 va_list args;
2674 int len;
2675 va_start(args, fmt);
2676 len = jio_vsnprintf(str, count, fmt, args);
2677 va_end(args);
2678 return len;
2679 }
2680
2681 ATTRIBUTE_PRINTF(2, 3)
2682 int jio_fprintf(FILE* f, const char *fmt, ...) {
2683 int len;
2684 va_list args;
2685 va_start(args, fmt);
2686 len = jio_vfprintf(f, fmt, args);
2687 va_end(args);
2688 return len;
2689 }
2690
2691 ATTRIBUTE_PRINTF(2, 0)
2692 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2693 if (Arguments::vfprintf_hook() != NULL) {
2694 return Arguments::vfprintf_hook()(f, fmt, args);
2695 } else {
2696 return vfprintf(f, fmt, args);
2697 }
2698 }
2699
2700 ATTRIBUTE_PRINTF(1, 2)
2701 JNIEXPORT int jio_printf(const char *fmt, ...) {
2702 int len;
2703 va_list args;
2704 va_start(args, fmt);
2705 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2706 va_end(args);
2707 return len;
2708 }
2709
2710 // HotSpot specific jio method
2711 void jio_print(const char* s, size_t len) {
2712 // Try to make this function as atomic as possible.
2713 if (Arguments::vfprintf_hook() != NULL) {
2714 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2715 } else {
2716 // Make an unused local variable to avoid warning from gcc 4.x compiler.
2717 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2718 }
2719 }
2720
2721 } // Extern C
2722
2723 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2724
2725 // In most of the JVM thread support functions we need to access the
2726 // thread through a ThreadsListHandle to prevent it from exiting and
2727 // being reclaimed while we try to operate on it. The exceptions to this
2728 // rule are when operating on the current thread, or if the monitor of
2729 // the target java.lang.Thread is locked at the Java level - in both
2730 // cases the target cannot exit.
2731
2732 static void thread_entry(JavaThread* thread, TRAPS) {
2733 HandleMark hm(THREAD);
2734 Handle obj(THREAD, thread->threadObj());
2735 JavaValue result(T_VOID);
2736 JavaCalls::call_virtual(&result,
2737 obj,
2738 SystemDictionary::Thread_klass(),
2739 vmSymbols::run_method_name(),
2740 vmSymbols::void_method_signature(),
2741 THREAD);
2742 }
2743
2744
2745 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2746 JVMWrapper("JVM_StartThread");
2747 JavaThread *native_thread = NULL;
2748
2749 // We cannot hold the Threads_lock when we throw an exception,
2750 // due to rank ordering issues. Example: we might need to grab the
2751 // Heap_lock while we construct the exception.
2752 bool throw_illegal_thread_state = false;
2753
2754 // We must release the Threads_lock before we can post a jvmti event
2755 // in Thread::start.
2756 {
2757 // Ensure that the C++ Thread and OSThread structures aren't freed before
2758 // we operate.
2759 MutexLocker mu(Threads_lock);
2760
2761 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2762 // re-starting an already started thread, so we should usually find
2763 // that the JavaThread is null. However for a JNI attached thread
2764 // there is a small window between the Thread object being created
2765 // (with its JavaThread set) and the update to its threadStatus, so we
2766 // have to check for this
2767 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2768 throw_illegal_thread_state = true;
2769 } else {
2770 // We could also check the stillborn flag to see if this thread was already stopped, but
2771 // for historical reasons we let the thread detect that itself when it starts running
2772
2773 jlong size =
2774 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2775 // Allocate the C++ Thread structure and create the native thread. The
2776 // stack size retrieved from java is 64-bit signed, but the constructor takes
2777 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2778 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2779 // - Avoid passing negative values which would result in really large stacks.
2780 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2781 size_t sz = size > 0 ? (size_t) size : 0;
2782 native_thread = new JavaThread(&thread_entry, sz);
2783
2784 // At this point it may be possible that no osthread was created for the
2785 // JavaThread due to lack of memory. Check for this situation and throw
2786 // an exception if necessary. Eventually we may want to change this so
2787 // that we only grab the lock if the thread was created successfully -
2788 // then we can also do this check and throw the exception in the
2789 // JavaThread constructor.
2790 if (native_thread->osthread() != NULL) {
2791 // Note: the current thread is not being used within "prepare".
2792 native_thread->prepare(jthread);
2793 }
2794 }
2795 }
2796
2797 if (throw_illegal_thread_state) {
2798 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2799 }
2800
2801 assert(native_thread != NULL, "Starting null thread?");
2802
2803 if (native_thread->osthread() == NULL) {
2804 // No one should hold a reference to the 'native_thread'.
2805 native_thread->smr_delete();
2806 if (JvmtiExport::should_post_resource_exhausted()) {
2807 JvmtiExport::post_resource_exhausted(
2808 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2809 os::native_thread_creation_failed_msg());
2810 }
2811 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2812 os::native_thread_creation_failed_msg());
2813 }
2814
2815 Thread::start(native_thread);
2816
2817 JVM_END
2818
2819
2820 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2821 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
2822 // but is thought to be reliable and simple. In the case, where the receiver is the
2823 // same thread as the sender, no VM_Operation is needed.
2824 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2825 JVMWrapper("JVM_StopThread");
2826
2827 // A nested ThreadsListHandle will grab the Threads_lock so create
2828 // tlh before we resolve throwable.
2829 ThreadsListHandle tlh(thread);
2830 oop java_throwable = JNIHandles::resolve(throwable);
2831 if (java_throwable == NULL) {
2832 THROW(vmSymbols::java_lang_NullPointerException());
2833 }
2834 oop java_thread = NULL;
2835 JavaThread* receiver = NULL;
2836 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2837 Events::log_exception(thread,
2838 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2839 p2i(receiver), p2i((address)java_thread), p2i(throwable));
2840
2841 if (is_alive) {
2842 // jthread refers to a live JavaThread.
2843 if (thread == receiver) {
2844 // Exception is getting thrown at self so no VM_Operation needed.
2845 THROW_OOP(java_throwable);
2846 } else {
2847 // Use a VM_Operation to throw the exception.
2848 Thread::send_async_exception(java_thread, java_throwable);
2849 }
2850 } else {
2851 // Either:
2852 // - target thread has not been started before being stopped, or
2853 // - target thread already terminated
2854 // We could read the threadStatus to determine which case it is
2855 // but that is overkill as it doesn't matter. We must set the
2856 // stillborn flag for the first case, and if the thread has already
2857 // exited setting this flag has no effect.
2858 java_lang_Thread::set_stillborn(java_thread);
2859 }
2860 JVM_END
2861
2862
2863 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2864 JVMWrapper("JVM_IsThreadAlive");
2865
2866 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2867 return java_lang_Thread::is_alive(thread_oop);
2868 JVM_END
2869
2870
2871 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
2872 JVMWrapper("JVM_SuspendThread");
2873
2874 ThreadsListHandle tlh(thread);
2875 JavaThread* receiver = NULL;
2876 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2877 if (is_alive) {
2878 // jthread refers to a live JavaThread.
2879 {
2880 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
2881 if (receiver->is_external_suspend()) {
2882 // Don't allow nested external suspend requests. We can't return
2883 // an error from this interface so just ignore the problem.
2884 return;
2885 }
2886 if (receiver->is_exiting()) { // thread is in the process of exiting
2887 return;
2888 }
2889 receiver->set_external_suspend();
2890 }
2891
2892 // java_suspend() will catch threads in the process of exiting
2893 // and will ignore them.
2894 receiver->java_suspend();
2895
2896 // It would be nice to have the following assertion in all the
2897 // time, but it is possible for a racing resume request to have
2898 // resumed this thread right after we suspended it. Temporarily
2899 // enable this assertion if you are chasing a different kind of
2900 // bug.
2901 //
2902 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
2903 // receiver->is_being_ext_suspended(), "thread is not suspended");
2904 }
2905 JVM_END
2906
2907
2908 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
2909 JVMWrapper("JVM_ResumeThread");
2910
2911 ThreadsListHandle tlh(thread);
2912 JavaThread* receiver = NULL;
2913 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
2914 if (is_alive) {
2915 // jthread refers to a live JavaThread.
2916
2917 // This is the original comment for this Threads_lock grab:
2918 // We need to *always* get the threads lock here, since this operation cannot be allowed during
2919 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
2920 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
2921 // looks at it.
2922 //
2923 // The above comment dates back to when we had both internal and
2924 // external suspend APIs that shared a common underlying mechanism.
2925 // External suspend is now entirely cooperative and doesn't share
2926 // anything with internal suspend. That said, there are some
2927 // assumptions in the VM that an external resume grabs the
2928 // Threads_lock. We can't drop the Threads_lock grab here until we
2929 // resolve the assumptions that exist elsewhere.
2930 //
2931 MutexLocker ml(Threads_lock);
2932 receiver->java_resume();
2933 }
2934 JVM_END
2935
2936
2937 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2938 JVMWrapper("JVM_SetThreadPriority");
2939
2940 ThreadsListHandle tlh(thread);
2941 oop java_thread = NULL;
2942 JavaThread* receiver = NULL;
2943 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2944 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2945
2946 if (is_alive) {
2947 // jthread refers to a live JavaThread.
2948 Thread::set_priority(receiver, (ThreadPriority)prio);
2949 }
2950 // Implied else: If the JavaThread hasn't started yet, then the
2951 // priority set in the java.lang.Thread object above will be pushed
2952 // down when it does start.
2953 JVM_END
2954
2955
2956 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2957 JVMWrapper("JVM_Yield");
2958 if (os::dont_yield()) return;
2959 HOTSPOT_THREAD_YIELD();
2960 os::naked_yield();
2961 JVM_END
2962
2963 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
2964 assert(event != NULL, "invariant");
2965 assert(event->should_commit(), "invariant");
2966 event->set_time(millis);
2967 event->commit();
2968 }
2969
2970 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
2971 JVMWrapper("JVM_Sleep");
2972
2973 if (millis < 0) {
2974 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
2975 }
2976
2977 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
2978 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2979 }
2980
2981 // Save current thread state and restore it at the end of this block.
2982 // And set new thread state to SLEEPING.
2983 JavaThreadSleepState jtss(thread);
2984
2985 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
2986 EventThreadSleep event;
2987
2988 if (millis == 0) {
2989 os::naked_yield();
2990 } else {
2991 ThreadState old_state = thread->osthread()->get_state();
2992 thread->osthread()->set_state(SLEEPING);
2993 if (!thread->sleep(millis)) { // interrupted
2994 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
2995 // us while we were sleeping. We do not overwrite those.
2996 if (!HAS_PENDING_EXCEPTION) {
2997 if (event.should_commit()) {
2998 post_thread_sleep_event(&event, millis);
2999 }
3000 HOTSPOT_THREAD_SLEEP_END(1);
3001
3002 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3003 // to properly restore the thread state. That's likely wrong.
3004 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3005 }
3006 }
3007 thread->osthread()->set_state(old_state);
3008 }
3009 if (event.should_commit()) {
3010 post_thread_sleep_event(&event, millis);
3011 }
3012 HOTSPOT_THREAD_SLEEP_END(0);
3013 JVM_END
3014
3015 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3016 JVMWrapper("JVM_CurrentThread");
3017 oop jthread = thread->threadObj();
3018 assert (thread != NULL, "no current thread!");
3019 return JNIHandles::make_local(env, jthread);
3020 JVM_END
3021
3022 class CountStackFramesTC : public ThreadClosure {
3023 int _count;
3024 bool _suspended;
3025 public:
3026 CountStackFramesTC() : _count(0), _suspended(false) {}
3027 virtual void do_thread(Thread* thread) {
3028 JavaThread* jt = (JavaThread*)thread;
3029 if (!jt->is_external_suspend()) {
3030 // To keep same behavior we fail this operation,
3031 // even if it would work perfectly.
3032 return;
3033 }
3034 _suspended = true;
3035 // Count all java activation, i.e., number of vframes.
3036 for (vframeStream vfst(jt); !vfst.at_end(); vfst.next()) {
3037 // Native frames are not counted.
3038 if (!vfst.method()->is_native()) _count++;
3039 }
3040 }
3041 int count() { return _count; }
3042 int suspended() { return _suspended; }
3043 };
3044
3045 JVM_ENTRY(jint, JVM_CountStackFrames(JNIEnv* env, jobject jthread))
3046 JVMWrapper("JVM_CountStackFrames");
3047
3048 ThreadsListHandle tlh(thread);
3049 JavaThread* receiver = NULL;
3050 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3051 if (is_alive) {
3052 // jthread refers to a live JavaThread.
3053 CountStackFramesTC csf;
3054 Handshake::execute(&csf, receiver);
3055 if (!csf.suspended()) {
3056 THROW_MSG_0(vmSymbols::java_lang_IllegalThreadStateException(),
3057 "this thread is not suspended");
3058 }
3059 return csf.count();
3060 }
3061 // Implied else: if JavaThread is not alive simply return a count of 0.
3062 return 0;
3063 JVM_END
3064
3065
3066 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3067 JVMWrapper("JVM_Interrupt");
3068
3069 ThreadsListHandle tlh(thread);
3070 JavaThread* receiver = NULL;
3071 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3072 if (is_alive) {
3073 // jthread refers to a live JavaThread.
3074 receiver->interrupt();
3075 }
3076 JVM_END
3077
3078
3079 JVM_ENTRY(jboolean, JVM_IsInterrupted(JNIEnv* env, jobject jthread, jboolean clear_interrupted))
3080 JVMWrapper("JVM_IsInterrupted");
3081
3082 ThreadsListHandle tlh(thread);
3083 JavaThread* receiver = NULL;
3084 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3085 if (is_alive) {
3086 // jthread refers to a live JavaThread.
3087 return (jboolean) receiver->is_interrupted(clear_interrupted != 0);
3088 } else {
3089 return JNI_FALSE;
3090 }
3091 JVM_END
3092
3093
3094 // Return true iff the current thread has locked the object passed in
3095
3096 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3097 JVMWrapper("JVM_HoldsLock");
3098 assert(THREAD->is_Java_thread(), "sanity check");
3099 if (obj == NULL) {
3100 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3101 }
3102 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3103 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3104 JVM_END
3105
3106
3107 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3108 JVMWrapper("JVM_DumpAllStacks");
3109 VM_PrintThreads op;
3110 VMThread::execute(&op);
3111 if (JvmtiExport::should_post_data_dump()) {
3112 JvmtiExport::post_data_dump();
3113 }
3114 JVM_END
3115
3116 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3117 JVMWrapper("JVM_SetNativeThreadName");
3118
3119 // We don't use a ThreadsListHandle here because the current thread
3120 // must be alive.
3121 oop java_thread = JNIHandles::resolve_non_null(jthread);
3122 JavaThread* thr = java_lang_Thread::thread(java_thread);
3123 if (thread == thr && !thr->has_attached_via_jni()) {
3124 // Thread naming is only supported for the current thread and
3125 // we don't set the name of an attached thread to avoid stepping
3126 // on other programs.
3127 ResourceMark rm(thread);
3128 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3129 os::set_native_thread_name(thread_name);
3130 }
3131 JVM_END
3132
3133 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3134
3135 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3136 JVMWrapper("JVM_GetClassContext");
3137 ResourceMark rm(THREAD);
3138 JvmtiVMObjectAllocEventCollector oam;
3139 vframeStream vfst(thread);
3140
3141 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3142 // This must only be called from SecurityManager.getClassContext
3143 Method* m = vfst.method();
3144 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3145 m->name() == vmSymbols::getClassContext_name() &&
3146 m->signature() == vmSymbols::void_class_array_signature())) {
3147 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3148 }
3149 }
3150
3151 // Collect method holders
3152 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3153 for (; !vfst.at_end(); vfst.security_next()) {
3154 Method* m = vfst.method();
3155 // Native frames are not returned
3156 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3157 Klass* holder = m->method_holder();
3158 assert(holder->is_klass(), "just checking");
3159 klass_array->append(holder);
3160 }
3161 }
3162
3163 // Create result array of type [Ljava/lang/Class;
3164 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3165 // Fill in mirrors corresponding to method holders
3166 for (int i = 0; i < klass_array->length(); i++) {
3167 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3168 }
3169
3170 return (jobjectArray) JNIHandles::make_local(env, result);
3171 JVM_END
3172
3173
3174 // java.lang.Package ////////////////////////////////////////////////////////////////
3175
3176
3177 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3178 JVMWrapper("JVM_GetSystemPackage");
3179 ResourceMark rm(THREAD);
3180 JvmtiVMObjectAllocEventCollector oam;
3181 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3182 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3183 return (jstring) JNIHandles::make_local(result);
3184 JVM_END
3185
3186
3187 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3188 JVMWrapper("JVM_GetSystemPackages");
3189 JvmtiVMObjectAllocEventCollector oam;
3190 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3191 return (jobjectArray) JNIHandles::make_local(result);
3192 JVM_END
3193
3194
3195 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3196
3197
3198 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3199 JVMWrapper("JVM_GetAndClearReferencePendingList");
3200
3201 MonitorLocker ml(Heap_lock);
3202 oop ref = Universe::reference_pending_list();
3203 if (ref != NULL) {
3204 Universe::set_reference_pending_list(NULL);
3205 }
3206 return JNIHandles::make_local(env, ref);
3207 JVM_END
3208
3209 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3210 JVMWrapper("JVM_HasReferencePendingList");
3211 MonitorLocker ml(Heap_lock);
3212 return Universe::has_reference_pending_list();
3213 JVM_END
3214
3215 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3216 JVMWrapper("JVM_WaitForReferencePendingList");
3217 MonitorLocker ml(Heap_lock);
3218 while (!Universe::has_reference_pending_list()) {
3219 ml.wait();
3220 }
3221 JVM_END
3222
3223
3224 // ObjectInputStream ///////////////////////////////////////////////////////////////
3225
3226 // Return the first user-defined class loader up the execution stack, or null
3227 // if only code from the bootstrap or platform class loader is on the stack.
3228
3229 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3230 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3231 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3232 oop loader = vfst.method()->method_holder()->class_loader();
3233 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3234 return JNIHandles::make_local(env, loader);
3235 }
3236 }
3237 return NULL;
3238 JVM_END
3239
3240
3241 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3242
3243
3244 // resolve array handle and check arguments
3245 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3246 if (arr == NULL) {
3247 THROW_0(vmSymbols::java_lang_NullPointerException());
3248 }
3249 oop a = JNIHandles::resolve_non_null(arr);
3250 if (!a->is_array()) {
3251 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3252 } else if (type_array_only && !a->is_typeArray()) {
3253 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3254 }
3255 return arrayOop(a);
3256 }
3257
3258
3259 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3260 JVMWrapper("JVM_GetArrayLength");
3261 arrayOop a = check_array(env, arr, false, CHECK_0);
3262 return a->length();
3263 JVM_END
3264
3265
3266 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3267 JVMWrapper("JVM_Array_Get");
3268 JvmtiVMObjectAllocEventCollector oam;
3269 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3270 jvalue value;
3271 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3272 oop box = Reflection::box(&value, type, CHECK_NULL);
3273 return JNIHandles::make_local(env, box);
3274 JVM_END
3275
3276
3277 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3278 JVMWrapper("JVM_GetPrimitiveArrayElement");
3279 jvalue value;
3280 value.i = 0; // to initialize value before getting used in CHECK
3281 arrayOop a = check_array(env, arr, true, CHECK_(value));
3282 assert(a->is_typeArray(), "just checking");
3283 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3284 BasicType wide_type = (BasicType) wCode;
3285 if (type != wide_type) {
3286 Reflection::widen(&value, type, wide_type, CHECK_(value));
3287 }
3288 return value;
3289 JVM_END
3290
3291
3292 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3293 JVMWrapper("JVM_SetArrayElement");
3294 arrayOop a = check_array(env, arr, false, CHECK);
3295 oop box = JNIHandles::resolve(val);
3296 jvalue value;
3297 value.i = 0; // to initialize value before getting used in CHECK
3298 BasicType value_type;
3299 if (a->is_objArray()) {
3300 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3301 value_type = Reflection::unbox_for_regular_object(box, &value);
3302 } else {
3303 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3304 }
3305 Reflection::array_set(&value, a, index, value_type, CHECK);
3306 JVM_END
3307
3308
3309 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3310 JVMWrapper("JVM_SetPrimitiveArrayElement");
3311 arrayOop a = check_array(env, arr, true, CHECK);
3312 assert(a->is_typeArray(), "just checking");
3313 BasicType value_type = (BasicType) vCode;
3314 Reflection::array_set(&v, a, index, value_type, CHECK);
3315 JVM_END
3316
3317
3318 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3319 JVMWrapper("JVM_NewArray");
3320 JvmtiVMObjectAllocEventCollector oam;
3321 oop element_mirror = JNIHandles::resolve(eltClass);
3322 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3323 return JNIHandles::make_local(env, result);
3324 JVM_END
3325
3326
3327 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3328 JVMWrapper("JVM_NewMultiArray");
3329 JvmtiVMObjectAllocEventCollector oam;
3330 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3331 oop element_mirror = JNIHandles::resolve(eltClass);
3332 assert(dim_array->is_typeArray(), "just checking");
3333 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3334 return JNIHandles::make_local(env, result);
3335 JVM_END
3336
3337
3338 // Library support ///////////////////////////////////////////////////////////////////////////
3339
3340 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3341 //%note jvm_ct
3342 JVMWrapper("JVM_LoadLibrary");
3343 char ebuf[1024];
3344 void *load_result;
3345 {
3346 ThreadToNativeFromVM ttnfvm(thread);
3347 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3348 }
3349 if (load_result == NULL) {
3350 char msg[1024];
3351 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3352 // Since 'ebuf' may contain a string encoded using
3353 // platform encoding scheme, we need to pass
3354 // Exceptions::unsafe_to_utf8 to the new_exception method
3355 // as the last argument. See bug 6367357.
3356 Handle h_exception =
3357 Exceptions::new_exception(thread,
3358 vmSymbols::java_lang_UnsatisfiedLinkError(),
3359 msg, Exceptions::unsafe_to_utf8);
3360
3361 THROW_HANDLE_0(h_exception);
3362 }
3363 return load_result;
3364 JVM_END
3365
3366
3367 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3368 JVMWrapper("JVM_UnloadLibrary");
3369 os::dll_unload(handle);
3370 JVM_END
3371
3372
3373 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3374 JVMWrapper("JVM_FindLibraryEntry");
3375 return os::dll_lookup(handle, name);
3376 JVM_END
3377
3378
3379 // JNI version ///////////////////////////////////////////////////////////////////////////////
3380
3381 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3382 JVMWrapper("JVM_IsSupportedJNIVersion");
3383 return Threads::is_supported_jni_version_including_1_1(version);
3384 JVM_END
3385
3386
3387 // String support ///////////////////////////////////////////////////////////////////////////
3388
3389 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3390 JVMWrapper("JVM_InternString");
3391 JvmtiVMObjectAllocEventCollector oam;
3392 if (str == NULL) return NULL;
3393 oop string = JNIHandles::resolve_non_null(str);
3394 oop result = StringTable::intern(string, CHECK_NULL);
3395 return (jstring) JNIHandles::make_local(env, result);
3396 JVM_END
3397
3398
3399 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3400
3401 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3402 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3403 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3404 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3405 // nature. JavaThreads will be "in native" when using this API from JDK code.
3406
3407
3408 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3409 VM_Exit::block_if_vm_exited();
3410 JVMWrapper("JVM_RawMonitorCreate");
3411 return new os::PlatformMutex();
3412 }
3413
3414
3415 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3416 VM_Exit::block_if_vm_exited();
3417 JVMWrapper("JVM_RawMonitorDestroy");
3418 delete ((os::PlatformMutex*) mon);
3419 }
3420
3421
3422 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3423 VM_Exit::block_if_vm_exited();
3424 JVMWrapper("JVM_RawMonitorEnter");
3425 ((os::PlatformMutex*) mon)->lock();
3426 return 0;
3427 }
3428
3429
3430 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3431 VM_Exit::block_if_vm_exited();
3432 JVMWrapper("JVM_RawMonitorExit");
3433 ((os::PlatformMutex*) mon)->unlock();
3434 }
3435
3436
3437 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3438
3439 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init, jboolean link,
3440 Handle loader, Handle protection_domain,
3441 jboolean throwError, TRAPS) {
3442 // Initialization also implies linking - check for coherent args
3443 assert((init && link) || !init, "incorrect use of init/link arguments");
3444
3445 // Security Note:
3446 // The Java level wrapper will perform the necessary security check allowing
3447 // us to pass the NULL as the initiating class loader. The VM is responsible for
3448 // the checkPackageAccess relative to the initiating class loader via the
3449 // protection_domain. The protection_domain is passed as NULL by the java code
3450 // if there is no security manager in 3-arg Class.forName().
3451 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3452
3453 // Check if we should initialize the class (which implies linking), or just link it
3454 if (init && klass->is_instance_klass()) {
3455 klass->initialize(CHECK_NULL);
3456 } else if (link && klass->is_instance_klass()) {
3457 InstanceKlass::cast(klass)->link_class(CHECK_NULL);
3458 }
3459 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3460 }
3461
3462
3463 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3464
3465 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3466 JVMWrapper("JVM_InvokeMethod");
3467 Handle method_handle;
3468 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3469 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3470 Handle receiver(THREAD, JNIHandles::resolve(obj));
3471 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3472 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3473 jobject res = JNIHandles::make_local(env, result);
3474 if (JvmtiExport::should_post_vm_object_alloc()) {
3475 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3476 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3477 if (java_lang_Class::is_primitive(ret_type)) {
3478 // Only for primitive type vm allocates memory for java object.
3479 // See box() method.
3480 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3481 }
3482 }
3483 return res;
3484 } else {
3485 THROW_0(vmSymbols::java_lang_StackOverflowError());
3486 }
3487 JVM_END
3488
3489
3490 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3491 JVMWrapper("JVM_NewInstanceFromConstructor");
3492 oop constructor_mirror = JNIHandles::resolve(c);
3493 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3494 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3495 jobject res = JNIHandles::make_local(env, result);
3496 if (JvmtiExport::should_post_vm_object_alloc()) {
3497 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3498 }
3499 return res;
3500 JVM_END
3501
3502 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3503
3504 JVM_LEAF(jboolean, JVM_SupportsCX8())
3505 JVMWrapper("JVM_SupportsCX8");
3506 return VM_Version::supports_cx8();
3507 JVM_END
3508
3509 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3510 JVMWrapper("JVM_InitializeFromArchive");
3511 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3512 assert(k->is_klass(), "just checking");
3513 HeapShared::initialize_from_archived_subgraph(k);
3514 JVM_END
3515
3516 // Returns an array of all live Thread objects (VM internal JavaThreads,
3517 // jvmti agent threads, and JNI attaching threads are skipped)
3518 // See CR 6404306 regarding JNI attaching threads
3519 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3520 ResourceMark rm(THREAD);
3521 ThreadsListEnumerator tle(THREAD, false, false);
3522 JvmtiVMObjectAllocEventCollector oam;
3523
3524 int num_threads = tle.num_threads();
3525 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3526 objArrayHandle threads_ah(THREAD, r);
3527
3528 for (int i = 0; i < num_threads; i++) {
3529 Handle h = tle.get_threadObj(i);
3530 threads_ah->obj_at_put(i, h());
3531 }
3532
3533 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3534 JVM_END
3535
3536
3537 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3538 // Return StackTraceElement[][], each element is the stack trace of a thread in
3539 // the corresponding entry in the given threads array
3540 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3541 JVMWrapper("JVM_DumpThreads");
3542 JvmtiVMObjectAllocEventCollector oam;
3543
3544 // Check if threads is null
3545 if (threads == NULL) {
3546 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3547 }
3548
3549 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3550 objArrayHandle ah(THREAD, a);
3551 int num_threads = ah->length();
3552 // check if threads is non-empty array
3553 if (num_threads == 0) {
3554 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3555 }
3556
3557 // check if threads is not an array of objects of Thread class
3558 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3559 if (k != SystemDictionary::Thread_klass()) {
3560 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3561 }
3562
3563 ResourceMark rm(THREAD);
3564
3565 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3566 for (int i = 0; i < num_threads; i++) {
3567 oop thread_obj = ah->obj_at(i);
3568 instanceHandle h(THREAD, (instanceOop) thread_obj);
3569 thread_handle_array->append(h);
3570 }
3571
3572 // The JavaThread references in thread_handle_array are validated
3573 // in VM_ThreadDump::doit().
3574 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3575 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3576
3577 JVM_END
3578
3579 // JVM monitoring and management support
3580 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3581 return Management::get_jmm_interface(version);
3582 JVM_END
3583
3584 // com.sun.tools.attach.VirtualMachine agent properties support
3585 //
3586 // Initialize the agent properties with the properties maintained in the VM
3587 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3588 JVMWrapper("JVM_InitAgentProperties");
3589 ResourceMark rm;
3590
3591 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3592
3593 PUTPROP(props, "sun.java.command", Arguments::java_command());
3594 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3595 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3596 return properties;
3597 JVM_END
3598
3599 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3600 {
3601 JVMWrapper("JVM_GetEnclosingMethodInfo");
3602 JvmtiVMObjectAllocEventCollector oam;
3603
3604 if (ofClass == NULL) {
3605 return NULL;
3606 }
3607 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3608 // Special handling for primitive objects
3609 if (java_lang_Class::is_primitive(mirror())) {
3610 return NULL;
3611 }
3612 Klass* k = java_lang_Class::as_Klass(mirror());
3613 if (!k->is_instance_klass()) {
3614 return NULL;
3615 }
3616 InstanceKlass* ik = InstanceKlass::cast(k);
3617 int encl_method_class_idx = ik->enclosing_method_class_index();
3618 if (encl_method_class_idx == 0) {
3619 return NULL;
3620 }
3621 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3622 objArrayHandle dest(THREAD, dest_o);
3623 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3624 dest->obj_at_put(0, enc_k->java_mirror());
3625 int encl_method_method_idx = ik->enclosing_method_method_index();
3626 if (encl_method_method_idx != 0) {
3627 Symbol* sym = ik->constants()->symbol_at(
3628 extract_low_short_from_int(
3629 ik->constants()->name_and_type_at(encl_method_method_idx)));
3630 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3631 dest->obj_at_put(1, str());
3632 sym = ik->constants()->symbol_at(
3633 extract_high_short_from_int(
3634 ik->constants()->name_and_type_at(encl_method_method_idx)));
3635 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3636 dest->obj_at_put(2, str());
3637 }
3638 return (jobjectArray) JNIHandles::make_local(dest());
3639 }
3640 JVM_END
3641
3642 JVM_ENTRY(void, JVM_GetVersionInfo(JNIEnv* env, jvm_version_info* info, size_t info_size))
3643 {
3644 memset(info, 0, info_size);
3645
3646 info->jvm_version = VM_Version::jvm_version();
3647 info->patch_version = VM_Version::vm_patch_version();
3648
3649 // when we add a new capability in the jvm_version_info struct, we should also
3650 // consider to expose this new capability in the sun.rt.jvmCapabilities jvmstat
3651 // counter defined in runtimeService.cpp.
3652 info->is_attach_supported = AttachListener::is_attach_supported();
3653 }
3654 JVM_END
3655
3656 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3657 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3658 ResourceMark rm(THREAD);
3659
3660 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3661 return NULL;
3662 }
3663
3664 char** vm_flags = Arguments::jvm_flags_array();
3665 char** vm_args = Arguments::jvm_args_array();
3666 int num_flags = Arguments::num_jvm_flags();
3667 int num_args = Arguments::num_jvm_args();
3668
3669 InstanceKlass* ik = SystemDictionary::String_klass();
3670 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3671 objArrayHandle result_h(THREAD, r);
3672
3673 int index = 0;
3674 for (int j = 0; j < num_flags; j++, index++) {
3675 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3676 result_h->obj_at_put(index, h());
3677 }
3678 for (int i = 0; i < num_args; i++, index++) {
3679 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3680 result_h->obj_at_put(index, h());
3681 }
3682 return (jobjectArray) JNIHandles::make_local(env, result_h());
3683 JVM_END
3684
3685 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3686 return os::get_signal_number(name);
3687 JVM_END