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