1 /*
2 * Copyright (c) 1997, 2020, 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/recordComponent.hpp"
55 #include "oops/objArrayKlass.hpp"
56 #include "oops/objArrayOop.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "prims/jvm_misc.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "prims/jvmtiThreadState.hpp"
61 #include "prims/nativeLookup.hpp"
62 #include "prims/stackwalk.hpp"
63 #include "runtime/arguments.hpp"
64 #include "runtime/atomic.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/init.hpp"
67 #include "runtime/interfaceSupport.inline.hpp"
68 #include "runtime/deoptimization.hpp"
69 #include "runtime/handshake.hpp"
70 #include "runtime/java.hpp"
71 #include "runtime/javaCalls.hpp"
72 #include "runtime/jfieldIDWorkaround.hpp"
73 #include "runtime/jniHandles.inline.hpp"
74 #include "runtime/os.inline.hpp"
75 #include "runtime/perfData.hpp"
76 #include "runtime/reflection.hpp"
77 #include "runtime/synchronizer.hpp"
78 #include "runtime/thread.inline.hpp"
79 #include "runtime/threadSMR.hpp"
80 #include "runtime/vframe.inline.hpp"
81 #include "runtime/vmOperations.hpp"
82 #include "runtime/vm_version.hpp"
83 #include "services/attachListener.hpp"
84 #include "services/management.hpp"
85 #include "services/threadService.hpp"
86 #include "utilities/copy.hpp"
87 #include "utilities/defaultStream.hpp"
88 #include "utilities/dtrace.hpp"
89 #include "utilities/events.hpp"
90 #include "utilities/histogram.hpp"
91 #include "utilities/macros.hpp"
92 #include "utilities/utf8.hpp"
93 #if INCLUDE_CDS
94 #include "classfile/systemDictionaryShared.hpp"
95 #endif
96
97 #include <errno.h>
98 #include <jfr/recorder/jfrRecorder.hpp>
99
100 /*
101 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
102 such ctors and calls MUST NOT come between an oop declaration/init and its
103 usage because if objects are move this may cause various memory stomps, bus
104 errors and segfaults. Here is a cookbook for causing so called "naked oop
105 failures":
106
107 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
108 JVMWrapper("JVM_GetClassDeclaredFields");
109
110 // Object address to be held directly in mirror & not visible to GC
111 oop mirror = JNIHandles::resolve_non_null(ofClass);
112
113 // If this ctor can hit a safepoint, moving objects around, then
114 ComplexConstructor foo;
115
116 // Boom! mirror may point to JUNK instead of the intended object
117 (some dereference of mirror)
118
119 // Here's another call that may block for GC, making mirror stale
120 MutexLocker ml(some_lock);
121
122 // And here's an initializer that can result in a stale oop
123 // all in one step.
124 oop o = call_that_can_throw_exception(TRAPS);
125
126
127 The solution is to keep the oop declaration BELOW the ctor or function
128 call that might cause a GC, do another resolve to reassign the oop, or
129 consider use of a Handle instead of an oop so there is immunity from object
130 motion. But note that the "QUICK" entries below do not have a handlemark
131 and thus can only support use of handles passed in.
132 */
133
134 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
135 ResourceMark rm;
136 int line_number = -1;
137 const char * source_file = NULL;
138 const char * trace = "explicit";
139 InstanceKlass* caller = NULL;
140 JavaThread* jthread = JavaThread::current();
141 if (jthread->has_last_Java_frame()) {
142 vframeStream vfst(jthread);
143
144 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
145 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
146 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
147 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
148 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
149
150 Method* last_caller = NULL;
151
152 while (!vfst.at_end()) {
153 Method* m = vfst.method();
154 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
155 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
156 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
157 break;
158 }
159 last_caller = m;
160 vfst.next();
161 }
162 // if this is called from Class.forName0 and that is called from Class.forName,
163 // then print the caller of Class.forName. If this is Class.loadClass, then print
164 // that caller, otherwise keep quiet since this should be picked up elsewhere.
165 bool found_it = false;
166 if (!vfst.at_end() &&
167 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
168 vfst.method()->name() == vmSymbols::forName0_name()) {
169 vfst.next();
170 if (!vfst.at_end() &&
171 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
172 vfst.method()->name() == vmSymbols::forName_name()) {
173 vfst.next();
174 found_it = true;
175 }
176 } else if (last_caller != NULL &&
177 last_caller->method_holder()->name() ==
178 vmSymbols::java_lang_ClassLoader() &&
179 last_caller->name() == vmSymbols::loadClass_name()) {
180 found_it = true;
181 } else if (!vfst.at_end()) {
182 if (vfst.method()->is_native()) {
183 // JNI call
184 found_it = true;
185 }
186 }
187 if (found_it && !vfst.at_end()) {
188 // found the caller
189 caller = vfst.method()->method_holder();
190 line_number = vfst.method()->line_number_from_bci(vfst.bci());
191 if (line_number == -1) {
192 // show method name if it's a native method
193 trace = vfst.method()->name_and_sig_as_C_string();
194 }
195 Symbol* s = caller->source_file_name();
196 if (s != NULL) {
197 source_file = s->as_C_string();
198 }
199 }
200 }
201 if (caller != NULL) {
202 if (to_class != caller) {
203 const char * from = caller->external_name();
204 const char * to = to_class->external_name();
205 // print in a single call to reduce interleaving between threads
206 if (source_file != NULL) {
207 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
208 } else {
209 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
210 }
211 }
212 }
213 }
214
215 void trace_class_resolution(Klass* to_class) {
216 EXCEPTION_MARK;
217 trace_class_resolution_impl(to_class, THREAD);
218 if (HAS_PENDING_EXCEPTION) {
219 CLEAR_PENDING_EXCEPTION;
220 }
221 }
222
223 // Wrapper to trace JVM functions
224
225 #ifdef ASSERT
226 Histogram* JVMHistogram;
227 volatile int JVMHistogram_lock = 0;
228
229 class JVMHistogramElement : public HistogramElement {
230 public:
231 JVMHistogramElement(const char* name);
232 };
233
234 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
235 _name = elementName;
236 uintx count = 0;
237
238 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) {
239 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) {
240 count +=1;
241 if ( (WarnOnStalledSpinLock > 0)
242 && (count % WarnOnStalledSpinLock == 0)) {
243 warning("JVMHistogram_lock seems to be stalled");
244 }
245 }
246 }
247
248 if(JVMHistogram == NULL)
249 JVMHistogram = new Histogram("JVM Call Counts",100);
250
251 JVMHistogram->add_element(this);
252 Atomic::dec(&JVMHistogram_lock);
253 }
254
255 #define JVMCountWrapper(arg) \
256 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
257 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
258
259 #define JVMWrapper(arg) JVMCountWrapper(arg);
260 #else
261 #define JVMWrapper(arg)
262 #endif
263
264
265 // Interface version /////////////////////////////////////////////////////////////////////
266
267
268 JVM_LEAF(jint, JVM_GetInterfaceVersion())
269 return JVM_INTERFACE_VERSION;
270 JVM_END
271
272
273 // java.lang.System //////////////////////////////////////////////////////////////////////
274
275
276 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
277 JVMWrapper("JVM_CurrentTimeMillis");
278 return os::javaTimeMillis();
279 JVM_END
280
281 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
282 JVMWrapper("JVM_NanoTime");
283 return os::javaTimeNanos();
284 JVM_END
285
286 // The function below is actually exposed by jdk.internal.misc.VM and not
287 // java.lang.System, but we choose to keep it here so that it stays next
288 // to JVM_CurrentTimeMillis and JVM_NanoTime
289
290 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
291 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
292
293 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
294 JVMWrapper("JVM_GetNanoTimeAdjustment");
295 jlong seconds;
296 jlong nanos;
297
298 os::javaTimeSystemUTC(seconds, nanos);
299
300 // We're going to verify that the result can fit in a long.
301 // For that we need the difference in seconds between 'seconds'
302 // and 'offset_secs' to be such that:
303 // |seconds - offset_secs| < (2^63/10^9)
304 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
305 // which makes |seconds - offset_secs| < 2^33
306 // and we will prefer +/- 2^32 as the maximum acceptable diff
307 // as 2^32 has a more natural feel than 2^33...
308 //
309 // So if |seconds - offset_secs| >= 2^32 - we return a special
310 // sentinel value (-1) which the caller should take as an
311 // exception value indicating that the offset given to us is
312 // too far from range of the current time - leading to too big
313 // a nano adjustment. The caller is expected to recover by
314 // computing a more accurate offset and calling this method
315 // again. (For the record 2^32 secs is ~136 years, so that
316 // should rarely happen)
317 //
318 jlong diff = seconds - offset_secs;
319 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
320 return -1; // sentinel value: the offset is too far off the target
321 }
322
323 // return the adjustment. If you compute a time by adding
324 // this number of nanoseconds along with the number of seconds
325 // in the offset you should get the current UTC time.
326 return (diff * (jlong)1000000000) + nanos;
327 JVM_END
328
329 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
330 jobject dst, jint dst_pos, jint length))
331 JVMWrapper("JVM_ArrayCopy");
332 // Check if we have null pointers
333 if (src == NULL || dst == NULL) {
334 THROW(vmSymbols::java_lang_NullPointerException());
335 }
336 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
337 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
338 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
339 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
340 // Do copy
341 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
342 JVM_END
343
344
345 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
346 JavaValue r(T_OBJECT);
347 // public synchronized Object put(Object key, Object value);
348 HandleMark hm(THREAD);
349 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
350 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
351 JavaCalls::call_virtual(&r,
352 props,
353 SystemDictionary::Properties_klass(),
354 vmSymbols::put_name(),
355 vmSymbols::object_object_object_signature(),
356 key_str,
357 value_str,
358 THREAD);
359 }
360
361
362 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
363
364 /*
365 * Return all of the system properties in a Java String array with alternating
366 * names and values from the jvm SystemProperty.
367 * Which includes some internal and all commandline -D defined properties.
368 */
369 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
370 JVMWrapper("JVM_GetProperties");
371 ResourceMark rm(THREAD);
372 HandleMark hm(THREAD);
373 int ndx = 0;
374 int fixedCount = 2;
375
376 SystemProperty* p = Arguments::system_properties();
377 int count = Arguments::PropertyList_count(p);
378
379 // Allocate result String array
380 InstanceKlass* ik = SystemDictionary::String_klass();
381 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
382 objArrayHandle result_h(THREAD, r);
383
384 while (p != NULL) {
385 const char * key = p->key();
386 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
387 const char * value = p->value();
388 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
389 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
390 result_h->obj_at_put(ndx * 2, key_str());
391 result_h->obj_at_put(ndx * 2 + 1, value_str());
392 ndx++;
393 }
394 p = p->next();
395 }
396
397 // Convert the -XX:MaxDirectMemorySize= command line flag
398 // to the sun.nio.MaxDirectMemorySize property.
399 // Do this after setting user properties to prevent people
400 // from setting the value with a -D option, as requested.
401 // Leave empty if not supplied
402 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
403 char as_chars[256];
404 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
405 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
406 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
407 result_h->obj_at_put(ndx * 2, key_str());
408 result_h->obj_at_put(ndx * 2 + 1, value_str());
409 ndx++;
410 }
411
412 // JVM monitoring and management support
413 // Add the sun.management.compiler property for the compiler's name
414 {
415 #undef CSIZE
416 #if defined(_LP64) || defined(_WIN64)
417 #define CSIZE "64-Bit "
418 #else
419 #define CSIZE
420 #endif // 64bit
421
422 #ifdef TIERED
423 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
424 #else
425 #if defined(COMPILER1)
426 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
427 #elif defined(COMPILER2)
428 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
429 #elif INCLUDE_JVMCI
430 #error "INCLUDE_JVMCI should imply TIERED"
431 #else
432 const char* compiler_name = "";
433 #endif // compilers
434 #endif // TIERED
435
436 if (*compiler_name != '\0' &&
437 (Arguments::mode() != Arguments::_int)) {
438 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
439 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
440 result_h->obj_at_put(ndx * 2, key_str());
441 result_h->obj_at_put(ndx * 2 + 1, value_str());
442 ndx++;
443 }
444 }
445
446 return (jobjectArray) JNIHandles::make_local(env, result_h());
447 JVM_END
448
449
450 /*
451 * Return the temporary directory that the VM uses for the attach
452 * and perf data files.
453 *
454 * It is important that this directory is well-known and the
455 * same for all VM instances. It cannot be affected by configuration
456 * variables such as java.io.tmpdir.
457 */
458 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
459 JVMWrapper("JVM_GetTemporaryDirectory");
460 HandleMark hm(THREAD);
461 const char* temp_dir = os::get_temp_directory();
462 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
463 return (jstring) JNIHandles::make_local(env, h());
464 JVM_END
465
466
467 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
468
469 extern volatile jint vm_created;
470
471 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
472 JVMWrapper("JVM_BeforeHalt");
473 // Link all classes for dynamic CDS dumping before vm exit.
474 if (DynamicDumpSharedSpaces) {
475 MetaspaceShared::link_and_cleanup_shared_classes(THREAD);
476 }
477 EventShutdown event;
478 if (event.should_commit()) {
479 event.set_reason("Shutdown requested from Java");
480 event.commit();
481 }
482 JVM_END
483
484
485 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
486 before_exit(thread);
487 vm_exit(code);
488 JVM_END
489
490
491 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
492 JVMWrapper("JVM_GC");
493 if (!DisableExplicitGC) {
494 if (AsyncDeflateIdleMonitors) {
495 // AsyncDeflateIdleMonitors needs to know when System.gc() is
496 // called so any special deflation can be done at a safepoint.
497 ObjectSynchronizer::set_is_special_deflation_requested(true);
498 }
499 Universe::heap()->collect(GCCause::_java_lang_system_gc);
500 }
501 JVM_END
502
503
504 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
505 JVMWrapper("JVM_MaxObjectInspectionAge");
506 return Universe::heap()->millis_since_last_gc();
507 JVM_END
508
509
510 static inline jlong convert_size_t_to_jlong(size_t val) {
511 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
512 NOT_LP64 (return (jlong)val;)
513 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
514 }
515
516 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
517 JVMWrapper("JVM_TotalMemory");
518 size_t n = Universe::heap()->capacity();
519 return convert_size_t_to_jlong(n);
520 JVM_END
521
522
523 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
524 JVMWrapper("JVM_FreeMemory");
525 size_t n = Universe::heap()->unused();
526 return convert_size_t_to_jlong(n);
527 JVM_END
528
529
530 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
531 JVMWrapper("JVM_MaxMemory");
532 size_t n = Universe::heap()->max_capacity();
533 return convert_size_t_to_jlong(n);
534 JVM_END
535
536
537 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
538 JVMWrapper("JVM_ActiveProcessorCount");
539 return os::active_processor_count();
540 JVM_END
541
542
543
544 // java.lang.Throwable //////////////////////////////////////////////////////
545
546 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
547 JVMWrapper("JVM_FillInStackTrace");
548 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
549 java_lang_Throwable::fill_in_stack_trace(exception);
550 JVM_END
551
552 // java.lang.NullPointerException ///////////////////////////////////////////
553
554 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
555 if (!ShowCodeDetailsInExceptionMessages) return NULL;
556
557 oop exc = JNIHandles::resolve_non_null(throwable);
558
559 Method* method;
560 int bci;
561 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
562 return NULL;
563 }
564 if (method->is_native()) {
565 return NULL;
566 }
567
568 stringStream ss;
569 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
570 if (ok) {
571 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
572 return (jstring) JNIHandles::make_local(env, result);
573 } else {
574 return NULL;
575 }
576 JVM_END
577
578 // java.lang.StackTraceElement //////////////////////////////////////////////
579
580
581 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
582 JVMWrapper("JVM_InitStackTraceElementArray");
583 Handle exception(THREAD, JNIHandles::resolve(throwable));
584 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
585 objArrayHandle stack_trace(THREAD, st);
586 // Fill in the allocated stack trace
587 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
588 JVM_END
589
590
591 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
592 JVMWrapper("JVM_InitStackTraceElement");
593 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
594 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
595 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
596 JVM_END
597
598
599 // java.lang.StackWalker //////////////////////////////////////////////////////
600
601
602 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
603 jint skip_frames, jint frame_count, jint start_index,
604 jobjectArray frames))
605 JVMWrapper("JVM_CallStackWalk");
606 JavaThread* jt = (JavaThread*) THREAD;
607 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
608 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
609 }
610
611 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
612
613 // frames array is a Class<?>[] array when only getting caller reference,
614 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
615 // be null.
616 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
617 objArrayHandle frames_array_h(THREAD, fa);
618
619 int limit = start_index + frame_count;
620 if (frames_array_h->length() < limit) {
621 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
622 }
623
624 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
625 start_index, frames_array_h, CHECK_NULL);
626 return JNIHandles::make_local(env, result);
627 JVM_END
628
629
630 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
631 jint frame_count, jint start_index,
632 jobjectArray frames))
633 JVMWrapper("JVM_MoreStackWalk");
634 JavaThread* jt = (JavaThread*) THREAD;
635
636 // frames array is a Class<?>[] array when only getting caller reference,
637 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
638 // be null.
639 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
640 objArrayHandle frames_array_h(THREAD, fa);
641
642 int limit = start_index+frame_count;
643 if (frames_array_h->length() < limit) {
644 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
645 }
646
647 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
648 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
649 start_index, frames_array_h, THREAD);
650 JVM_END
651
652 // java.lang.Object ///////////////////////////////////////////////
653
654
655 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
656 JVMWrapper("JVM_IHashCode");
657 // as implemented in the classic virtual machine; return 0 if object is NULL
658 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
659 JVM_END
660
661
662 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
663 JVMWrapper("JVM_MonitorWait");
664 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
665 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
666 if (JvmtiExport::should_post_monitor_wait()) {
667 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
668
669 // The current thread already owns the monitor and it has not yet
670 // been added to the wait queue so the current thread cannot be
671 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
672 // event handler cannot accidentally consume an unpark() meant for
673 // the ParkEvent associated with this ObjectMonitor.
674 }
675 ObjectSynchronizer::wait(obj, ms, CHECK);
676 JVM_END
677
678
679 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
680 JVMWrapper("JVM_MonitorNotify");
681 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
682 ObjectSynchronizer::notify(obj, CHECK);
683 JVM_END
684
685
686 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
687 JVMWrapper("JVM_MonitorNotifyAll");
688 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
689 ObjectSynchronizer::notifyall(obj, CHECK);
690 JVM_END
691
692
693 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
694 JVMWrapper("JVM_Clone");
695 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
696 Klass* klass = obj->klass();
697 JvmtiVMObjectAllocEventCollector oam;
698
699 #ifdef ASSERT
700 // Just checking that the cloneable flag is set correct
701 if (obj->is_array()) {
702 guarantee(klass->is_cloneable(), "all arrays are cloneable");
703 } else {
704 guarantee(obj->is_instance(), "should be instanceOop");
705 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
706 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
707 }
708 #endif
709
710 // Check if class of obj supports the Cloneable interface.
711 // All arrays are considered to be cloneable (See JLS 20.1.5).
712 // All j.l.r.Reference classes are considered non-cloneable.
713 if (!klass->is_cloneable() ||
714 (klass->is_instance_klass() &&
715 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
716 ResourceMark rm(THREAD);
717 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
718 }
719
720 // Make shallow object copy
721 const int size = obj->size();
722 oop new_obj_oop = NULL;
723 if (obj->is_array()) {
724 const int length = ((arrayOop)obj())->length();
725 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
726 /* do_zero */ true, CHECK_NULL);
727 } else {
728 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
729 }
730
731 HeapAccess<>::clone(obj(), new_obj_oop, size);
732
733 Handle new_obj(THREAD, new_obj_oop);
734 // Caution: this involves a java upcall, so the clone should be
735 // "gc-robust" by this stage.
736 if (klass->has_finalizer()) {
737 assert(obj->is_instance(), "should be instanceOop");
738 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
739 new_obj = Handle(THREAD, new_obj_oop);
740 }
741
742 return JNIHandles::make_local(env, new_obj());
743 JVM_END
744
745 // java.io.File ///////////////////////////////////////////////////////////////
746
747 JVM_LEAF(char*, JVM_NativePath(char* path))
748 JVMWrapper("JVM_NativePath");
749 return os::native_path(path);
750 JVM_END
751
752
753 // Misc. class handling ///////////////////////////////////////////////////////////
754
755
756 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
757 JVMWrapper("JVM_GetCallerClass");
758
759 // Getting the class of the caller frame.
760 //
761 // The call stack at this point looks something like this:
762 //
763 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
764 // [1] [ @CallerSensitive API.method ]
765 // [.] [ (skipped intermediate frames) ]
766 // [n] [ caller ]
767 vframeStream vfst(thread);
768 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
769 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
770 Method* m = vfst.method();
771 assert(m != NULL, "sanity");
772 switch (n) {
773 case 0:
774 // This must only be called from Reflection.getCallerClass
775 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
776 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
777 }
778 // fall-through
779 case 1:
780 // Frame 0 and 1 must be caller sensitive.
781 if (!m->caller_sensitive()) {
782 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
783 }
784 break;
785 default:
786 if (!m->is_ignored_by_security_stack_walk()) {
787 // We have reached the desired frame; return the holder class.
788 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
789 }
790 break;
791 }
792 }
793 return NULL;
794 JVM_END
795
796
797 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
798 JVMWrapper("JVM_FindPrimitiveClass");
799 oop mirror = NULL;
800 BasicType t = name2type(utf);
801 if (t != T_ILLEGAL && !is_reference_type(t)) {
802 mirror = Universe::java_mirror(t);
803 }
804 if (mirror == NULL) {
805 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
806 } else {
807 return (jclass) JNIHandles::make_local(env, mirror);
808 }
809 JVM_END
810
811
812 // Returns a class loaded by the bootstrap class loader; or null
813 // if not found. ClassNotFoundException is not thrown.
814 // FindClassFromBootLoader is exported to the launcher for windows.
815 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
816 const char* name))
817 JVMWrapper("JVM_FindClassFromBootLoader");
818
819 // Java libraries should ensure that name is never null or illegal.
820 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
821 // It's impossible to create this class; the name cannot fit
822 // into the constant pool.
823 return NULL;
824 }
825 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
826
827 TempNewSymbol h_name = SymbolTable::new_symbol(name);
828 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
829 if (k == NULL) {
830 return NULL;
831 }
832
833 if (log_is_enabled(Debug, class, resolve)) {
834 trace_class_resolution(k);
835 }
836 return (jclass) JNIHandles::make_local(env, k->java_mirror());
837 JVM_END
838
839 // Find a class with this name in this loader, using the caller's protection domain.
840 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
841 jboolean init, jobject loader,
842 jclass caller))
843 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
844
845 TempNewSymbol h_name =
846 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
847 CHECK_NULL);
848
849 oop loader_oop = JNIHandles::resolve(loader);
850 oop from_class = JNIHandles::resolve(caller);
851 oop protection_domain = NULL;
852 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
853 // NPE. Put it in another way, the bootstrap class loader has all permission and
854 // thus no checkPackageAccess equivalence in the VM class loader.
855 // The caller is also passed as NULL by the java code if there is no security
856 // manager to avoid the performance cost of getting the calling class.
857 if (from_class != NULL && loader_oop != NULL) {
858 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
859 }
860
861 Handle h_loader(THREAD, loader_oop);
862 Handle h_prot(THREAD, protection_domain);
863 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
864 h_prot, false, THREAD);
865
866 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
867 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
868 }
869 return result;
870 JVM_END
871
872 // Currently only called from the old verifier.
873 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
874 jboolean init, jclass from))
875 JVMWrapper("JVM_FindClassFromClass");
876 TempNewSymbol h_name =
877 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
878 CHECK_NULL);
879 oop from_class_oop = JNIHandles::resolve(from);
880 Klass* from_class = (from_class_oop == NULL)
881 ? (Klass*)NULL
882 : java_lang_Class::as_Klass(from_class_oop);
883 oop class_loader = NULL;
884 oop protection_domain = NULL;
885 if (from_class != NULL) {
886 class_loader = from_class->class_loader();
887 protection_domain = from_class->protection_domain();
888 }
889 Handle h_loader(THREAD, class_loader);
890 Handle h_prot (THREAD, protection_domain);
891 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
892 h_prot, true, thread);
893
894 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
895 // this function is generally only used for class loading during verification.
896 ResourceMark rm;
897 oop from_mirror = JNIHandles::resolve_non_null(from);
898 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
899 const char * from_name = from_class->external_name();
900
901 oop mirror = JNIHandles::resolve_non_null(result);
902 Klass* to_class = java_lang_Class::as_Klass(mirror);
903 const char * to = to_class->external_name();
904 log_debug(class, resolve)("%s %s (verification)", from_name, to);
905 }
906
907 return result;
908 JVM_END
909
910 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
911 if (loader.is_null()) {
912 return;
913 }
914
915 // check whether the current caller thread holds the lock or not.
916 // If not, increment the corresponding counter
917 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
918 ObjectSynchronizer::owner_self) {
919 counter->inc();
920 }
921 }
922
923 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
924 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
925 jobject loader, const jbyte *buf,
926 jsize len, jobject pd, const char *source,
927 TRAPS) {
928 if (source == NULL) source = "__JVM_DefineClass__";
929
930 assert(THREAD->is_Java_thread(), "must be a JavaThread");
931 JavaThread* jt = (JavaThread*) THREAD;
932
933 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
934 ClassLoader::perf_define_appclass_selftime(),
935 ClassLoader::perf_define_appclasses(),
936 jt->get_thread_stat()->perf_recursion_counts_addr(),
937 jt->get_thread_stat()->perf_timers_addr(),
938 PerfClassTraceTime::DEFINE_CLASS);
939
940 if (UsePerfData) {
941 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
942 }
943
944 // Class resolution will get the class name from the .class stream if the name is null.
945 TempNewSymbol class_name = name == NULL ? NULL :
946 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
947 CHECK_NULL);
948
949 ResourceMark rm(THREAD);
950 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
951 Handle class_loader (THREAD, JNIHandles::resolve(loader));
952 if (UsePerfData) {
953 is_lock_held_by_thread(class_loader,
954 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
955 THREAD);
956 }
957 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
958 Klass* k = SystemDictionary::resolve_from_stream(class_name,
959 class_loader,
960 protection_domain,
961 &st,
962 CHECK_NULL);
963
964 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
965 trace_class_resolution(k);
966 }
967
968 return (jclass) JNIHandles::make_local(env, k->java_mirror());
969 }
970
971 enum {
972 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
973 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
974 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
975 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
976 };
977
978 /*
979 * Define a class with the specified flags that indicates if it's a nestmate,
980 * hidden, or strongly referenced from class loader.
981 */
982 static jclass jvm_lookup_define_class(JNIEnv *env, jclass lookup, const char *name,
983 const jbyte *buf, jsize len, jobject pd,
984 jboolean init, int flags, jobject classData, TRAPS) {
985 assert(THREAD->is_Java_thread(), "must be a JavaThread");
986 JavaThread* jt = (JavaThread*) THREAD;
987 ResourceMark rm(THREAD);
988
989 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
990 // Lookup class must be a non-null instance
991 if (lookup_k == NULL) {
992 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
993 }
994 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
995
996 Handle class_loader (THREAD, lookup_k->class_loader());
997
998 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
999 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1000 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1001 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1002
1003 InstanceKlass* host_class = NULL;
1004 if (is_nestmate) {
1005 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1006 }
1007
1008 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1009 name,
1010 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1011 is_nestmate ? host_class->external_name() : "",
1012 is_hidden ? "hidden" : "not hidden",
1013 is_strong ? "strong" : "weak",
1014 vm_annotations ? "with vm annotations" : "without vm annotation");
1015
1016 if (!is_hidden) {
1017 // classData is only applicable for hidden classes
1018 if (classData != NULL) {
1019 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1020 }
1021 if (is_nestmate) {
1022 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1023 }
1024 if (!is_strong) {
1025 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1026 }
1027 if (vm_annotations) {
1028 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1029 }
1030 if (flags != STRONG_LOADER_LINK) {
1031 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1032 err_msg("invalid flag 0x%x", flags));
1033 }
1034 }
1035
1036 // Class resolution will get the class name from the .class stream if the name is null.
1037 TempNewSymbol class_name = name == NULL ? NULL :
1038 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1039 CHECK_NULL);
1040
1041 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1042 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1043 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1044
1045 Klass* defined_k;
1046 InstanceKlass* ik = NULL;
1047 if (!is_hidden) {
1048 defined_k = SystemDictionary::resolve_from_stream(class_name,
1049 class_loader,
1050 protection_domain,
1051 &st,
1052 CHECK_NULL);
1053
1054 if (log_is_enabled(Debug, class, resolve) && defined_k != NULL) {
1055 trace_class_resolution(defined_k);
1056 }
1057 ik = InstanceKlass::cast(defined_k);
1058 } else { // hidden
1059 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1060 ClassLoadInfo cl_info(protection_domain,
1061 NULL, // unsafe_anonymous_host
1062 NULL, // cp_patches
1063 host_class,
1064 classData_h,
1065 is_hidden,
1066 is_strong,
1067 vm_annotations);
1068 defined_k = SystemDictionary::parse_stream(class_name,
1069 class_loader,
1070 &st,
1071 cl_info,
1072 CHECK_NULL);
1073 if (defined_k == NULL) {
1074 THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a hidden class");
1075 }
1076
1077 ik = InstanceKlass::cast(defined_k);
1078
1079 // The hidden class loader data has been artificially been kept alive to
1080 // this point. The mirror and any instances of this class have to keep
1081 // it alive afterwards.
1082 ik->class_loader_data()->dec_keep_alive();
1083
1084 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1085 ModuleEntry* module = ik->module();
1086 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1087 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1088 module_name,
1089 ik->external_name(),
1090 host_class->external_name(),
1091 ik->is_hidden() ? "is hidden" : "is not hidden");
1092 }
1093 }
1094 assert(Reflection::is_same_class_package(lookup_k, defined_k),
1095 "lookup class and defined class are in different packages");
1096
1097 if (init) {
1098 ik->initialize(CHECK_NULL);
1099 } else {
1100 ik->link_class(CHECK_NULL);
1101 }
1102
1103 return (jclass) JNIHandles::make_local(env, defined_k->java_mirror());
1104 }
1105
1106 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1107 JVMWrapper("JVM_DefineClass");
1108
1109 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
1110 JVM_END
1111
1112 /*
1113 * Define a class with the specified lookup class.
1114 * lookup: Lookup class
1115 * name: the name of the class
1116 * buf: class bytes
1117 * len: length of class bytes
1118 * pd: protection domain
1119 * init: initialize the class
1120 * flags: properties of the class
1121 * classData: private static pre-initialized field
1122 */
1123 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1124 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1125 JVMWrapper("JVM_LookupDefineClass");
1126
1127 if (lookup == NULL) {
1128 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1129 }
1130
1131 assert(buf != NULL, "buf must not be NULL");
1132
1133 return jvm_lookup_define_class(env, lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1134 JVM_END
1135
1136 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1137 JVMWrapper("JVM_DefineClassWithSource");
1138
1139 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
1140 JVM_END
1141
1142 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1143 JVMWrapper("JVM_FindLoadedClass");
1144 ResourceMark rm(THREAD);
1145
1146 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1147 char* str = java_lang_String::as_utf8_string(h_name());
1148
1149 // Sanity check, don't expect null
1150 if (str == NULL) return NULL;
1151
1152 // Internalize the string, converting '.' to '/' in string.
1153 char* p = (char*)str;
1154 while (*p != '\0') {
1155 if (*p == '.') {
1156 *p = '/';
1157 }
1158 p++;
1159 }
1160
1161 const int str_len = (int)(p - str);
1162 if (str_len > Symbol::max_length()) {
1163 // It's impossible to create this class; the name cannot fit
1164 // into the constant pool.
1165 return NULL;
1166 }
1167 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1168
1169 // Security Note:
1170 // The Java level wrapper will perform the necessary security check allowing
1171 // us to pass the NULL as the initiating class loader.
1172 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1173 if (UsePerfData) {
1174 is_lock_held_by_thread(h_loader,
1175 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1176 THREAD);
1177 }
1178
1179 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1180 h_loader,
1181 Handle(),
1182 CHECK_NULL);
1183 #if INCLUDE_CDS
1184 if (k == NULL) {
1185 // If the class is not already loaded, try to see if it's in the shared
1186 // archive for the current classloader (h_loader).
1187 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1188 }
1189 #endif
1190 return (k == NULL) ? NULL :
1191 (jclass) JNIHandles::make_local(env, k->java_mirror());
1192 JVM_END
1193
1194 // Module support //////////////////////////////////////////////////////////////////////////////
1195
1196 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1197 jstring location, jobjectArray packages))
1198 JVMWrapper("JVM_DefineModule");
1199 Modules::define_module(module, is_open, version, location, packages, CHECK);
1200 JVM_END
1201
1202 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1203 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1204 Modules::set_bootloader_unnamed_module(module, CHECK);
1205 JVM_END
1206
1207 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1208 JVMWrapper("JVM_AddModuleExports");
1209 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1210 JVM_END
1211
1212 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1213 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1214 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1215 JVM_END
1216
1217 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1218 JVMWrapper("JVM_AddModuleExportsToAll");
1219 Modules::add_module_exports(from_module, package, NULL, CHECK);
1220 JVM_END
1221
1222 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1223 JVMWrapper("JVM_AddReadsModule");
1224 Modules::add_reads_module(from_module, source_module, CHECK);
1225 JVM_END
1226
1227 // Reflection support //////////////////////////////////////////////////////////////////////////////
1228
1229 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1230 assert (cls != NULL, "illegal class");
1231 JVMWrapper("JVM_InitClassName");
1232 JvmtiVMObjectAllocEventCollector oam;
1233 ResourceMark rm(THREAD);
1234 HandleMark hm(THREAD);
1235 Handle java_class(THREAD, JNIHandles::resolve(cls));
1236 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1237 return (jstring) JNIHandles::make_local(env, result);
1238 JVM_END
1239
1240
1241 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1242 JVMWrapper("JVM_GetClassInterfaces");
1243 JvmtiVMObjectAllocEventCollector oam;
1244 oop mirror = JNIHandles::resolve_non_null(cls);
1245
1246 // Special handling for primitive objects
1247 if (java_lang_Class::is_primitive(mirror)) {
1248 // Primitive objects does not have any interfaces
1249 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1250 return (jobjectArray) JNIHandles::make_local(env, r);
1251 }
1252
1253 Klass* klass = java_lang_Class::as_Klass(mirror);
1254 // Figure size of result array
1255 int size;
1256 if (klass->is_instance_klass()) {
1257 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1258 } else {
1259 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1260 size = 2;
1261 }
1262
1263 // Allocate result array
1264 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1265 objArrayHandle result (THREAD, r);
1266 // Fill in result
1267 if (klass->is_instance_klass()) {
1268 // Regular instance klass, fill in all local interfaces
1269 for (int index = 0; index < size; index++) {
1270 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1271 result->obj_at_put(index, k->java_mirror());
1272 }
1273 } else {
1274 // All arrays implement java.lang.Cloneable and java.io.Serializable
1275 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1276 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1277 }
1278 return (jobjectArray) JNIHandles::make_local(env, result());
1279 JVM_END
1280
1281
1282 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1283 JVMWrapper("JVM_IsInterface");
1284 oop mirror = JNIHandles::resolve_non_null(cls);
1285 if (java_lang_Class::is_primitive(mirror)) {
1286 return JNI_FALSE;
1287 }
1288 Klass* k = java_lang_Class::as_Klass(mirror);
1289 jboolean result = k->is_interface();
1290 assert(!result || k->is_instance_klass(),
1291 "all interfaces are instance types");
1292 // The compiler intrinsic for isInterface tests the
1293 // Klass::_access_flags bits in the same way.
1294 return result;
1295 JVM_END
1296
1297 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1298 JVMWrapper("JVM_IsHiddenClass");
1299 oop mirror = JNIHandles::resolve_non_null(cls);
1300 if (java_lang_Class::is_primitive(mirror)) {
1301 return JNI_FALSE;
1302 }
1303 Klass* k = java_lang_Class::as_Klass(mirror);
1304 return k->is_hidden();
1305 JVM_END
1306
1307 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1308 JVMWrapper("JVM_GetClassSigners");
1309 JvmtiVMObjectAllocEventCollector oam;
1310 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1311 // There are no signers for primitive types
1312 return NULL;
1313 }
1314
1315 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1316
1317 // If there are no signers set in the class, or if the class
1318 // is an array, return NULL.
1319 if (signers == NULL) return NULL;
1320
1321 // copy of the signers array
1322 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1323 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1324 for (int index = 0; index < signers->length(); index++) {
1325 signers_copy->obj_at_put(index, signers->obj_at(index));
1326 }
1327
1328 // return the copy
1329 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1330 JVM_END
1331
1332
1333 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1334 JVMWrapper("JVM_SetClassSigners");
1335 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1336 // This call is ignored for primitive types and arrays.
1337 // Signers are only set once, ClassLoader.java, and thus shouldn't
1338 // be called with an array. Only the bootstrap loader creates arrays.
1339 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1340 if (k->is_instance_klass()) {
1341 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1342 }
1343 }
1344 JVM_END
1345
1346
1347 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1348 JVMWrapper("JVM_GetProtectionDomain");
1349 if (JNIHandles::resolve(cls) == NULL) {
1350 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1351 }
1352
1353 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1354 // Primitive types does not have a protection domain.
1355 return NULL;
1356 }
1357
1358 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1359 return (jobject) JNIHandles::make_local(env, pd);
1360 JVM_END
1361
1362
1363 // Returns the inherited_access_control_context field of the running thread.
1364 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1365 JVMWrapper("JVM_GetInheritedAccessControlContext");
1366 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1367 return JNIHandles::make_local(env, result);
1368 JVM_END
1369
1370 class RegisterArrayForGC {
1371 private:
1372 JavaThread *_thread;
1373 public:
1374 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1375 _thread = thread;
1376 _thread->register_array_for_gc(array);
1377 }
1378
1379 ~RegisterArrayForGC() {
1380 _thread->register_array_for_gc(NULL);
1381 }
1382 };
1383
1384
1385 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1386 JVMWrapper("JVM_GetStackAccessControlContext");
1387 if (!UsePrivilegedStack) return NULL;
1388
1389 ResourceMark rm(THREAD);
1390 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1391 JvmtiVMObjectAllocEventCollector oam;
1392
1393 // count the protection domains on the execution stack. We collapse
1394 // duplicate consecutive protection domains into a single one, as
1395 // well as stopping when we hit a privileged frame.
1396
1397 oop previous_protection_domain = NULL;
1398 Handle privileged_context(thread, NULL);
1399 bool is_privileged = false;
1400 oop protection_domain = NULL;
1401
1402 // Iterate through Java frames
1403 vframeStream vfst(thread);
1404 for(; !vfst.at_end(); vfst.next()) {
1405 // get method of frame
1406 Method* method = vfst.method();
1407
1408 // stop at the first privileged frame
1409 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1410 method->name() == vmSymbols::executePrivileged_name())
1411 {
1412 // this frame is privileged
1413 is_privileged = true;
1414
1415 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1416
1417 StackValueCollection* locals = priv->locals();
1418 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1419 StackValue* clr_sv = locals->at(2); // Class<?> caller
1420 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1421 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1422 privileged_context = ctx_sv->get_obj();
1423 Handle caller = clr_sv->get_obj();
1424
1425 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1426 protection_domain = caller_klass->protection_domain();
1427 } else {
1428 protection_domain = method->method_holder()->protection_domain();
1429 }
1430
1431 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1432 local_array->push(protection_domain);
1433 previous_protection_domain = protection_domain;
1434 }
1435
1436 if (is_privileged) break;
1437 }
1438
1439
1440 // either all the domains on the stack were system domains, or
1441 // we had a privileged system domain
1442 if (local_array->is_empty()) {
1443 if (is_privileged && privileged_context.is_null()) return NULL;
1444
1445 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1446 return JNIHandles::make_local(env, result);
1447 }
1448
1449 // the resource area must be registered in case of a gc
1450 RegisterArrayForGC ragc(thread, local_array);
1451 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1452 local_array->length(), CHECK_NULL);
1453 objArrayHandle h_context(thread, context);
1454 for (int index = 0; index < local_array->length(); index++) {
1455 h_context->obj_at_put(index, local_array->at(index));
1456 }
1457
1458 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1459
1460 return JNIHandles::make_local(env, result);
1461 JVM_END
1462
1463
1464 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1465 JVMWrapper("JVM_IsArrayClass");
1466 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1467 return (k != NULL) && k->is_array_klass() ? true : false;
1468 JVM_END
1469
1470
1471 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1472 JVMWrapper("JVM_IsPrimitiveClass");
1473 oop mirror = JNIHandles::resolve_non_null(cls);
1474 return (jboolean) java_lang_Class::is_primitive(mirror);
1475 JVM_END
1476
1477
1478 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1479 JVMWrapper("JVM_GetClassModifiers");
1480 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1481 // Primitive type
1482 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1483 }
1484
1485 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1486 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1487 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1488 return k->modifier_flags();
1489 JVM_END
1490
1491
1492 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1493
1494 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1495 JvmtiVMObjectAllocEventCollector oam;
1496 // ofClass is a reference to a java_lang_Class object. The mirror object
1497 // of an InstanceKlass
1498
1499 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1500 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1501 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1502 return (jobjectArray)JNIHandles::make_local(env, result);
1503 }
1504
1505 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1506 InnerClassesIterator iter(k);
1507
1508 if (iter.length() == 0) {
1509 // Neither an inner nor outer class
1510 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1511 return (jobjectArray)JNIHandles::make_local(env, result);
1512 }
1513
1514 // find inner class info
1515 constantPoolHandle cp(thread, k->constants());
1516 int length = iter.length();
1517
1518 // Allocate temp. result array
1519 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1520 objArrayHandle result (THREAD, r);
1521 int members = 0;
1522
1523 for (; !iter.done(); iter.next()) {
1524 int ioff = iter.inner_class_info_index();
1525 int ooff = iter.outer_class_info_index();
1526
1527 if (ioff != 0 && ooff != 0) {
1528 // Check to see if the name matches the class we're looking for
1529 // before attempting to find the class.
1530 if (cp->klass_name_at_matches(k, ooff)) {
1531 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1532 if (outer_klass == k) {
1533 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1534 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1535
1536 // Throws an exception if outer klass has not declared k as
1537 // an inner klass
1538 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1539
1540 result->obj_at_put(members, inner_klass->java_mirror());
1541 members++;
1542 }
1543 }
1544 }
1545 }
1546
1547 if (members != length) {
1548 // Return array of right length
1549 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1550 for(int i = 0; i < members; i++) {
1551 res->obj_at_put(i, result->obj_at(i));
1552 }
1553 return (jobjectArray)JNIHandles::make_local(env, res);
1554 }
1555
1556 return (jobjectArray)JNIHandles::make_local(env, result());
1557 JVM_END
1558
1559
1560 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1561 {
1562 // ofClass is a reference to a java_lang_Class object.
1563 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1564 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1565 return NULL;
1566 }
1567
1568 bool inner_is_member = false;
1569 Klass* outer_klass
1570 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1571 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1572 if (outer_klass == NULL) return NULL; // already a top-level class
1573 if (!inner_is_member) return NULL; // a hidden or unsafe anonymous class (inside a method)
1574 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1575 }
1576 JVM_END
1577
1578 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1579 {
1580 oop mirror = JNIHandles::resolve_non_null(cls);
1581 if (java_lang_Class::is_primitive(mirror) ||
1582 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1583 return NULL;
1584 }
1585 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1586 int ooff = 0, noff = 0;
1587 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1588 if (noff != 0) {
1589 constantPoolHandle i_cp(thread, k->constants());
1590 Symbol* name = i_cp->symbol_at(noff);
1591 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1592 return (jstring) JNIHandles::make_local(env, str());
1593 }
1594 }
1595 return NULL;
1596 }
1597 JVM_END
1598
1599 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1600 assert (cls != NULL, "illegal class");
1601 JVMWrapper("JVM_GetClassSignature");
1602 JvmtiVMObjectAllocEventCollector oam;
1603 ResourceMark rm(THREAD);
1604 // Return null for arrays and primatives
1605 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1606 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1607 if (k->is_instance_klass()) {
1608 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1609 if (sym == NULL) return NULL;
1610 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1611 return (jstring) JNIHandles::make_local(env, str());
1612 }
1613 }
1614 return NULL;
1615 JVM_END
1616
1617
1618 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1619 assert (cls != NULL, "illegal class");
1620 JVMWrapper("JVM_GetClassAnnotations");
1621
1622 // Return null for arrays and primitives
1623 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1624 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1625 if (k->is_instance_klass()) {
1626 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1627 return (jbyteArray) JNIHandles::make_local(env, a);
1628 }
1629 }
1630 return NULL;
1631 JVM_END
1632
1633
1634 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1635 // some of this code was adapted from from jni_FromReflectedField
1636
1637 oop reflected = JNIHandles::resolve_non_null(field);
1638 oop mirror = java_lang_reflect_Field::clazz(reflected);
1639 Klass* k = java_lang_Class::as_Klass(mirror);
1640 int slot = java_lang_reflect_Field::slot(reflected);
1641 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1642
1643 InstanceKlass* ik = InstanceKlass::cast(k);
1644 intptr_t offset = ik->field_offset(slot);
1645
1646 if (modifiers & JVM_ACC_STATIC) {
1647 // for static fields we only look in the current class
1648 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1649 assert(false, "cannot find static field");
1650 return false;
1651 }
1652 } else {
1653 // for instance fields we start with the current class and work
1654 // our way up through the superclass chain
1655 if (!ik->find_field_from_offset(offset, false, &fd)) {
1656 assert(false, "cannot find instance field");
1657 return false;
1658 }
1659 }
1660 return true;
1661 }
1662
1663 static Method* jvm_get_method_common(jobject method) {
1664 // some of this code was adapted from from jni_FromReflectedMethod
1665
1666 oop reflected = JNIHandles::resolve_non_null(method);
1667 oop mirror = NULL;
1668 int slot = 0;
1669
1670 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1671 mirror = java_lang_reflect_Constructor::clazz(reflected);
1672 slot = java_lang_reflect_Constructor::slot(reflected);
1673 } else {
1674 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1675 "wrong type");
1676 mirror = java_lang_reflect_Method::clazz(reflected);
1677 slot = java_lang_reflect_Method::slot(reflected);
1678 }
1679 Klass* k = java_lang_Class::as_Klass(mirror);
1680
1681 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1682 assert(m != NULL, "cannot find method");
1683 return m; // caller has to deal with NULL in product mode
1684 }
1685
1686 /* Type use annotations support (JDK 1.8) */
1687
1688 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1689 assert (cls != NULL, "illegal class");
1690 JVMWrapper("JVM_GetClassTypeAnnotations");
1691 ResourceMark rm(THREAD);
1692 // Return null for arrays and primitives
1693 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1694 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1695 if (k->is_instance_klass()) {
1696 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1697 if (type_annotations != NULL) {
1698 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1699 return (jbyteArray) JNIHandles::make_local(env, a);
1700 }
1701 }
1702 }
1703 return NULL;
1704 JVM_END
1705
1706 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1707 assert (method != NULL, "illegal method");
1708 JVMWrapper("JVM_GetMethodTypeAnnotations");
1709
1710 // method is a handle to a java.lang.reflect.Method object
1711 Method* m = jvm_get_method_common(method);
1712 if (m == NULL) {
1713 return NULL;
1714 }
1715
1716 AnnotationArray* type_annotations = m->type_annotations();
1717 if (type_annotations != NULL) {
1718 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1719 return (jbyteArray) JNIHandles::make_local(env, a);
1720 }
1721
1722 return NULL;
1723 JVM_END
1724
1725 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1726 assert (field != NULL, "illegal field");
1727 JVMWrapper("JVM_GetFieldTypeAnnotations");
1728
1729 fieldDescriptor fd;
1730 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1731 if (!gotFd) {
1732 return NULL;
1733 }
1734
1735 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1736 JVM_END
1737
1738 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1739 if (!cp->is_within_bounds(index)) {
1740 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1741 }
1742 }
1743
1744 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1745 {
1746 JVMWrapper("JVM_GetMethodParameters");
1747 // method is a handle to a java.lang.reflect.Method object
1748 Method* method_ptr = jvm_get_method_common(method);
1749 methodHandle mh (THREAD, method_ptr);
1750 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1751 const int num_params = mh->method_parameters_length();
1752
1753 if (num_params < 0) {
1754 // A -1 return value from method_parameters_length means there is no
1755 // parameter data. Return null to indicate this to the reflection
1756 // API.
1757 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1758 return (jobjectArray)NULL;
1759 } else {
1760 // Otherwise, we return something up to reflection, even if it is
1761 // a zero-length array. Why? Because in some cases this can
1762 // trigger a MalformedParametersException.
1763
1764 // make sure all the symbols are properly formatted
1765 for (int i = 0; i < num_params; i++) {
1766 MethodParametersElement* params = mh->method_parameters_start();
1767 int index = params[i].name_cp_index;
1768 constantPoolHandle cp(THREAD, mh->constants());
1769 bounds_check(cp, index, CHECK_NULL);
1770
1771 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1772 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1773 "Wrong type at constant pool index");
1774 }
1775
1776 }
1777
1778 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1779 objArrayHandle result (THREAD, result_oop);
1780
1781 for (int i = 0; i < num_params; i++) {
1782 MethodParametersElement* params = mh->method_parameters_start();
1783 // For a 0 index, give a NULL symbol
1784 Symbol* sym = 0 != params[i].name_cp_index ?
1785 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1786 int flags = params[i].flags;
1787 oop param = Reflection::new_parameter(reflected_method, i, sym,
1788 flags, CHECK_NULL);
1789 result->obj_at_put(i, param);
1790 }
1791 return (jobjectArray)JNIHandles::make_local(env, result());
1792 }
1793 }
1794 JVM_END
1795
1796 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1797
1798 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1799 {
1800 JVMWrapper("JVM_GetClassDeclaredFields");
1801 JvmtiVMObjectAllocEventCollector oam;
1802
1803 // Exclude primitive types and array types
1804 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1805 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1806 // Return empty array
1807 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1808 return (jobjectArray) JNIHandles::make_local(env, res);
1809 }
1810
1811 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1812 constantPoolHandle cp(THREAD, k->constants());
1813
1814 // Ensure class is linked
1815 k->link_class(CHECK_NULL);
1816
1817 // Allocate result
1818 int num_fields;
1819
1820 if (publicOnly) {
1821 num_fields = 0;
1822 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1823 if (fs.access_flags().is_public()) ++num_fields;
1824 }
1825 } else {
1826 num_fields = k->java_fields_count();
1827 }
1828
1829 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1830 objArrayHandle result (THREAD, r);
1831
1832 int out_idx = 0;
1833 fieldDescriptor fd;
1834 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1835 if (!publicOnly || fs.access_flags().is_public()) {
1836 fd.reinitialize(k, fs.index());
1837 oop field = Reflection::new_field(&fd, CHECK_NULL);
1838 result->obj_at_put(out_idx, field);
1839 ++out_idx;
1840 }
1841 }
1842 assert(out_idx == num_fields, "just checking");
1843 return (jobjectArray) JNIHandles::make_local(env, result());
1844 }
1845 JVM_END
1846
1847 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1848 {
1849 JVMWrapper("JVM_IsRecord");
1850 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1851 if (k != NULL && k->is_instance_klass()) {
1852 InstanceKlass* ik = InstanceKlass::cast(k);
1853 return ik->is_record();
1854 } else {
1855 return false;
1856 }
1857 }
1858 JVM_END
1859
1860 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1861 {
1862 JVMWrapper("JVM_GetRecordComponents");
1863 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1864 assert(c->is_instance_klass(), "must be");
1865 InstanceKlass* ik = InstanceKlass::cast(c);
1866
1867 if (ik->is_record()) {
1868 Array<RecordComponent*>* components = ik->record_components();
1869 assert(components != NULL, "components should not be NULL");
1870 {
1871 JvmtiVMObjectAllocEventCollector oam;
1872 constantPoolHandle cp(THREAD, ik->constants());
1873 int length = components->length();
1874 assert(length >= 0, "unexpected record_components length");
1875 objArrayOop record_components =
1876 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL);
1877 objArrayHandle components_h (THREAD, record_components);
1878
1879 for (int x = 0; x < length; x++) {
1880 RecordComponent* component = components->at(x);
1881 assert(component != NULL, "unexpected NULL record component");
1882 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1883 components_h->obj_at_put(x, component_oop);
1884 }
1885 return (jobjectArray)JNIHandles::make_local(components_h());
1886 }
1887 }
1888
1889 // Return empty array if ofClass is not a record.
1890 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL);
1891 return (jobjectArray)JNIHandles::make_local(env, result);
1892 }
1893 JVM_END
1894
1895 static bool select_method(const methodHandle& method, bool want_constructor) {
1896 if (want_constructor) {
1897 return (method->is_initializer() && !method->is_static());
1898 } else {
1899 return (!method->is_initializer() && !method->is_overpass());
1900 }
1901 }
1902
1903 static jobjectArray get_class_declared_methods_helper(
1904 JNIEnv *env,
1905 jclass ofClass, jboolean publicOnly,
1906 bool want_constructor,
1907 Klass* klass, TRAPS) {
1908
1909 JvmtiVMObjectAllocEventCollector oam;
1910
1911 // Exclude primitive types and array types
1912 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1913 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1914 // Return empty array
1915 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1916 return (jobjectArray) JNIHandles::make_local(env, res);
1917 }
1918
1919 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1920
1921 // Ensure class is linked
1922 k->link_class(CHECK_NULL);
1923
1924 Array<Method*>* methods = k->methods();
1925 int methods_length = methods->length();
1926
1927 // Save original method_idnum in case of redefinition, which can change
1928 // the idnum of obsolete methods. The new method will have the same idnum
1929 // but if we refresh the methods array, the counts will be wrong.
1930 ResourceMark rm(THREAD);
1931 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1932 int num_methods = 0;
1933
1934 for (int i = 0; i < methods_length; i++) {
1935 methodHandle method(THREAD, methods->at(i));
1936 if (select_method(method, want_constructor)) {
1937 if (!publicOnly || method->is_public()) {
1938 idnums->push(method->method_idnum());
1939 ++num_methods;
1940 }
1941 }
1942 }
1943
1944 // Allocate result
1945 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1946 objArrayHandle result (THREAD, r);
1947
1948 // Now just put the methods that we selected above, but go by their idnum
1949 // in case of redefinition. The methods can be redefined at any safepoint,
1950 // so above when allocating the oop array and below when creating reflect
1951 // objects.
1952 for (int i = 0; i < num_methods; i++) {
1953 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1954 if (method.is_null()) {
1955 // Method may have been deleted and seems this API can handle null
1956 // Otherwise should probably put a method that throws NSME
1957 result->obj_at_put(i, NULL);
1958 } else {
1959 oop m;
1960 if (want_constructor) {
1961 m = Reflection::new_constructor(method, CHECK_NULL);
1962 } else {
1963 m = Reflection::new_method(method, false, CHECK_NULL);
1964 }
1965 result->obj_at_put(i, m);
1966 }
1967 }
1968
1969 return (jobjectArray) JNIHandles::make_local(env, result());
1970 }
1971
1972 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1973 {
1974 JVMWrapper("JVM_GetClassDeclaredMethods");
1975 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1976 /*want_constructor*/ false,
1977 SystemDictionary::reflect_Method_klass(), THREAD);
1978 }
1979 JVM_END
1980
1981 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1982 {
1983 JVMWrapper("JVM_GetClassDeclaredConstructors");
1984 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1985 /*want_constructor*/ true,
1986 SystemDictionary::reflect_Constructor_klass(), THREAD);
1987 }
1988 JVM_END
1989
1990 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1991 {
1992 JVMWrapper("JVM_GetClassAccessFlags");
1993 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1994 // Primitive type
1995 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1996 }
1997
1998 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1999 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
2000 }
2001 JVM_END
2002
2003 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
2004 {
2005 JVMWrapper("JVM_AreNestMates");
2006 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2007 assert(c->is_instance_klass(), "must be");
2008 InstanceKlass* ck = InstanceKlass::cast(c);
2009 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2010 assert(m->is_instance_klass(), "must be");
2011 InstanceKlass* mk = InstanceKlass::cast(m);
2012 return ck->has_nestmate_access_to(mk, THREAD);
2013 }
2014 JVM_END
2015
2016 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2017 {
2018 // current is not a primitive or array class
2019 JVMWrapper("JVM_GetNestHost");
2020 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2021 assert(c->is_instance_klass(), "must be");
2022 InstanceKlass* ck = InstanceKlass::cast(c);
2023 InstanceKlass* host = ck->nest_host(THREAD);
2024 return (jclass) (host == NULL ? NULL :
2025 JNIHandles::make_local(THREAD, host->java_mirror()));
2026 }
2027 JVM_END
2028
2029 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2030 {
2031 // current is not a primitive or array class
2032 JVMWrapper("JVM_GetNestMembers");
2033 ResourceMark rm(THREAD);
2034 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2035 assert(c->is_instance_klass(), "must be");
2036 InstanceKlass* ck = InstanceKlass::cast(c);
2037 InstanceKlass* host = ck->nest_host(THREAD);
2038
2039 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2040 ck->external_name(), host->external_name());
2041 {
2042 JvmtiVMObjectAllocEventCollector oam;
2043 Array<u2>* members = host->nest_members();
2044 int length = members == NULL ? 0 : members->length();
2045
2046 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2047
2048 // nest host is first in the array so make it one bigger
2049 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2050 length + 1, CHECK_NULL);
2051 objArrayHandle result(THREAD, r);
2052 result->obj_at_put(0, host->java_mirror());
2053 if (length != 0) {
2054 int count = 0;
2055 for (int i = 0; i < length; i++) {
2056 int cp_index = members->at(i);
2057 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2058 if (HAS_PENDING_EXCEPTION) {
2059 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) {
2060 return NULL; // propagate VMEs
2061 }
2062 if (log_is_enabled(Trace, class, nestmates)) {
2063 stringStream ss;
2064 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2065 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2066 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2067 log_trace(class, nestmates)("%s", ss.as_string());
2068 }
2069 CLEAR_PENDING_EXCEPTION;
2070 continue;
2071 }
2072 if (k->is_instance_klass()) {
2073 InstanceKlass* ik = InstanceKlass::cast(k);
2074 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2075 if (nest_host_k == host) {
2076 result->obj_at_put(count+1, k->java_mirror());
2077 count++;
2078 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2079 } else {
2080 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2081 ik->external_name(), nest_host_k->external_name());
2082 }
2083 } else {
2084 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2085 k->external_name());
2086 }
2087 }
2088 if (count < length) {
2089 // we had invalid entries so we need to compact the array
2090 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2091 length + 1, count + 1);
2092
2093 objArrayOop r2 = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2094 count + 1, CHECK_NULL);
2095 objArrayHandle result2(THREAD, r2);
2096 for (int i = 0; i < count + 1; i++) {
2097 result2->obj_at_put(i, result->obj_at(i));
2098 }
2099 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2100 }
2101 }
2102 else {
2103 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2104 }
2105 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2106 }
2107 }
2108 JVM_END
2109
2110 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2111 {
2112 JVMWrapper("JVM_GetPermittedSubclasses");
2113 assert(!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(current)), "should not be");
2114 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2115 assert(c->is_instance_klass(), "must be");
2116 InstanceKlass* ik = InstanceKlass::cast(c);
2117 {
2118 JvmtiVMObjectAllocEventCollector oam;
2119 Array<u2>* subclasses = ik->permitted_subclasses();
2120 int length = subclasses == NULL ? 0 : subclasses->length();
2121 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
2122 length, CHECK_NULL);
2123 objArrayHandle result(THREAD, r);
2124 for (int i = 0; i < length; i++) {
2125 int cp_index = subclasses->at(i);
2126 // This returns <package-name>/<class-name>.
2127 Symbol* klass_name = ik->constants()->klass_name_at(cp_index);
2128 assert(klass_name != NULL, "Unexpected null klass_name");
2129 Handle perm_subtype_h = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2130 result->obj_at_put(i, perm_subtype_h());
2131 }
2132 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2133 }
2134 }
2135 JVM_END
2136
2137 // Constant pool access //////////////////////////////////////////////////////////
2138
2139 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2140 {
2141 JVMWrapper("JVM_GetClassConstantPool");
2142 JvmtiVMObjectAllocEventCollector oam;
2143
2144 // Return null for primitives and arrays
2145 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2146 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2147 if (k->is_instance_klass()) {
2148 InstanceKlass* k_h = InstanceKlass::cast(k);
2149 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2150 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2151 return JNIHandles::make_local(jcp());
2152 }
2153 }
2154 return NULL;
2155 }
2156 JVM_END
2157
2158
2159 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2160 {
2161 JVMWrapper("JVM_ConstantPoolGetSize");
2162 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2163 return cp->length();
2164 }
2165 JVM_END
2166
2167
2168 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2169 {
2170 JVMWrapper("JVM_ConstantPoolGetClassAt");
2171 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2172 bounds_check(cp, index, CHECK_NULL);
2173 constantTag tag = cp->tag_at(index);
2174 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2175 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2176 }
2177 Klass* k = cp->klass_at(index, CHECK_NULL);
2178 return (jclass) JNIHandles::make_local(k->java_mirror());
2179 }
2180 JVM_END
2181
2182 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2183 {
2184 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2185 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2186 bounds_check(cp, index, CHECK_NULL);
2187 constantTag tag = cp->tag_at(index);
2188 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2189 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2190 }
2191 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2192 if (k == NULL) return NULL;
2193 return (jclass) JNIHandles::make_local(k->java_mirror());
2194 }
2195 JVM_END
2196
2197 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2198 constantTag tag = cp->tag_at(index);
2199 if (!tag.is_method() && !tag.is_interface_method()) {
2200 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2201 }
2202 int klass_ref = cp->uncached_klass_ref_index_at(index);
2203 Klass* k_o;
2204 if (force_resolution) {
2205 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2206 } else {
2207 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2208 if (k_o == NULL) return NULL;
2209 }
2210 InstanceKlass* k = InstanceKlass::cast(k_o);
2211 Symbol* name = cp->uncached_name_ref_at(index);
2212 Symbol* sig = cp->uncached_signature_ref_at(index);
2213 methodHandle m (THREAD, k->find_method(name, sig));
2214 if (m.is_null()) {
2215 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2216 }
2217 oop method;
2218 if (!m->is_initializer() || m->is_static()) {
2219 method = Reflection::new_method(m, true, CHECK_NULL);
2220 } else {
2221 method = Reflection::new_constructor(m, CHECK_NULL);
2222 }
2223 return JNIHandles::make_local(method);
2224 }
2225
2226 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2227 {
2228 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2229 JvmtiVMObjectAllocEventCollector oam;
2230 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2231 bounds_check(cp, index, CHECK_NULL);
2232 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2233 return res;
2234 }
2235 JVM_END
2236
2237 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2238 {
2239 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2240 JvmtiVMObjectAllocEventCollector oam;
2241 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2242 bounds_check(cp, index, CHECK_NULL);
2243 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2244 return res;
2245 }
2246 JVM_END
2247
2248 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2249 constantTag tag = cp->tag_at(index);
2250 if (!tag.is_field()) {
2251 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2252 }
2253 int klass_ref = cp->uncached_klass_ref_index_at(index);
2254 Klass* k_o;
2255 if (force_resolution) {
2256 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2257 } else {
2258 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2259 if (k_o == NULL) return NULL;
2260 }
2261 InstanceKlass* k = InstanceKlass::cast(k_o);
2262 Symbol* name = cp->uncached_name_ref_at(index);
2263 Symbol* sig = cp->uncached_signature_ref_at(index);
2264 fieldDescriptor fd;
2265 Klass* target_klass = k->find_field(name, sig, &fd);
2266 if (target_klass == NULL) {
2267 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2268 }
2269 oop field = Reflection::new_field(&fd, CHECK_NULL);
2270 return JNIHandles::make_local(field);
2271 }
2272
2273 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2274 {
2275 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2276 JvmtiVMObjectAllocEventCollector oam;
2277 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2278 bounds_check(cp, index, CHECK_NULL);
2279 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2280 return res;
2281 }
2282 JVM_END
2283
2284 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2285 {
2286 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2287 JvmtiVMObjectAllocEventCollector oam;
2288 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2289 bounds_check(cp, index, CHECK_NULL);
2290 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2291 return res;
2292 }
2293 JVM_END
2294
2295 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2296 {
2297 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2298 JvmtiVMObjectAllocEventCollector oam;
2299 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2300 bounds_check(cp, index, CHECK_NULL);
2301 constantTag tag = cp->tag_at(index);
2302 if (!tag.is_field_or_method()) {
2303 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2304 }
2305 int klass_ref = cp->uncached_klass_ref_index_at(index);
2306 Symbol* klass_name = cp->klass_name_at(klass_ref);
2307 Symbol* member_name = cp->uncached_name_ref_at(index);
2308 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2309 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2310 objArrayHandle dest(THREAD, dest_o);
2311 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2312 dest->obj_at_put(0, str());
2313 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2314 dest->obj_at_put(1, str());
2315 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2316 dest->obj_at_put(2, str());
2317 return (jobjectArray) JNIHandles::make_local(dest());
2318 }
2319 JVM_END
2320
2321 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2322 {
2323 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2324 JvmtiVMObjectAllocEventCollector oam;
2325 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2326 bounds_check(cp, index, CHECK_0);
2327 constantTag tag = cp->tag_at(index);
2328 if (!tag.is_field_or_method()) {
2329 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2330 }
2331 return (jint) cp->uncached_klass_ref_index_at(index);
2332 }
2333 JVM_END
2334
2335 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2336 {
2337 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2338 JvmtiVMObjectAllocEventCollector oam;
2339 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2340 bounds_check(cp, index, CHECK_0);
2341 constantTag tag = cp->tag_at(index);
2342 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2343 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2344 }
2345 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2346 }
2347 JVM_END
2348
2349 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2350 {
2351 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2352 JvmtiVMObjectAllocEventCollector oam;
2353 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2354 bounds_check(cp, index, CHECK_NULL);
2355 constantTag tag = cp->tag_at(index);
2356 if (!tag.is_name_and_type()) {
2357 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2358 }
2359 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2360 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2361 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2362 objArrayHandle dest(THREAD, dest_o);
2363 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2364 dest->obj_at_put(0, str());
2365 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2366 dest->obj_at_put(1, str());
2367 return (jobjectArray) JNIHandles::make_local(dest());
2368 }
2369 JVM_END
2370
2371 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2372 {
2373 JVMWrapper("JVM_ConstantPoolGetIntAt");
2374 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2375 bounds_check(cp, index, CHECK_0);
2376 constantTag tag = cp->tag_at(index);
2377 if (!tag.is_int()) {
2378 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2379 }
2380 return cp->int_at(index);
2381 }
2382 JVM_END
2383
2384 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2385 {
2386 JVMWrapper("JVM_ConstantPoolGetLongAt");
2387 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2388 bounds_check(cp, index, CHECK_(0L));
2389 constantTag tag = cp->tag_at(index);
2390 if (!tag.is_long()) {
2391 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2392 }
2393 return cp->long_at(index);
2394 }
2395 JVM_END
2396
2397 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2398 {
2399 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2400 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2401 bounds_check(cp, index, CHECK_(0.0f));
2402 constantTag tag = cp->tag_at(index);
2403 if (!tag.is_float()) {
2404 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2405 }
2406 return cp->float_at(index);
2407 }
2408 JVM_END
2409
2410 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2411 {
2412 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2413 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2414 bounds_check(cp, index, CHECK_(0.0));
2415 constantTag tag = cp->tag_at(index);
2416 if (!tag.is_double()) {
2417 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2418 }
2419 return cp->double_at(index);
2420 }
2421 JVM_END
2422
2423 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2424 {
2425 JVMWrapper("JVM_ConstantPoolGetStringAt");
2426 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2427 bounds_check(cp, index, CHECK_NULL);
2428 constantTag tag = cp->tag_at(index);
2429 if (!tag.is_string()) {
2430 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2431 }
2432 oop str = cp->string_at(index, CHECK_NULL);
2433 return (jstring) JNIHandles::make_local(str);
2434 }
2435 JVM_END
2436
2437 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2438 {
2439 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2440 JvmtiVMObjectAllocEventCollector oam;
2441 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2442 bounds_check(cp, index, CHECK_NULL);
2443 constantTag tag = cp->tag_at(index);
2444 if (!tag.is_symbol()) {
2445 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2446 }
2447 Symbol* sym = cp->symbol_at(index);
2448 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2449 return (jstring) JNIHandles::make_local(str());
2450 }
2451 JVM_END
2452
2453 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2454 {
2455 JVMWrapper("JVM_ConstantPoolGetTagAt");
2456 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2457 bounds_check(cp, index, CHECK_0);
2458 constantTag tag = cp->tag_at(index);
2459 jbyte result = tag.value();
2460 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2461 // they are changed to the corresponding tags from the JVM spec, so that java code in
2462 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2463 if (tag.is_klass_or_reference()) {
2464 result = JVM_CONSTANT_Class;
2465 } else if (tag.is_string_index()) {
2466 result = JVM_CONSTANT_String;
2467 } else if (tag.is_method_type_in_error()) {
2468 result = JVM_CONSTANT_MethodType;
2469 } else if (tag.is_method_handle_in_error()) {
2470 result = JVM_CONSTANT_MethodHandle;
2471 } else if (tag.is_dynamic_constant_in_error()) {
2472 result = JVM_CONSTANT_Dynamic;
2473 }
2474 return result;
2475 }
2476 JVM_END
2477
2478 // Assertion support. //////////////////////////////////////////////////////////
2479
2480 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2481 JVMWrapper("JVM_DesiredAssertionStatus");
2482 assert(cls != NULL, "bad class");
2483
2484 oop r = JNIHandles::resolve(cls);
2485 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2486 if (java_lang_Class::is_primitive(r)) return false;
2487
2488 Klass* k = java_lang_Class::as_Klass(r);
2489 assert(k->is_instance_klass(), "must be an instance klass");
2490 if (!k->is_instance_klass()) return false;
2491
2492 ResourceMark rm(THREAD);
2493 const char* name = k->name()->as_C_string();
2494 bool system_class = k->class_loader() == NULL;
2495 return JavaAssertions::enabled(name, system_class);
2496
2497 JVM_END
2498
2499
2500 // Return a new AssertionStatusDirectives object with the fields filled in with
2501 // command-line assertion arguments (i.e., -ea, -da).
2502 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2503 JVMWrapper("JVM_AssertionStatusDirectives");
2504 JvmtiVMObjectAllocEventCollector oam;
2505 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2506 return JNIHandles::make_local(env, asd);
2507 JVM_END
2508
2509 // Verification ////////////////////////////////////////////////////////////////////////////////
2510
2511 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2512
2513 // RedefineClasses support: bug 6214132 caused verification to fail.
2514 // All functions from this section should call the jvmtiThreadSate function:
2515 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2516 // The function returns a Klass* of the _scratch_class if the verifier
2517 // was invoked in the middle of the class redefinition.
2518 // Otherwise it returns its argument value which is the _the_class Klass*.
2519 // Please, refer to the description in the jvmtiThreadSate.hpp.
2520
2521 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2522 JVMWrapper("JVM_GetClassNameUTF");
2523 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2524 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2525 return k->name()->as_utf8();
2526 JVM_END
2527
2528
2529 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2530 JVMWrapper("JVM_GetClassCPTypes");
2531 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2532 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2533 // types will have length zero if this is not an InstanceKlass
2534 // (length is determined by call to JVM_GetClassCPEntriesCount)
2535 if (k->is_instance_klass()) {
2536 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2537 for (int index = cp->length() - 1; index >= 0; index--) {
2538 constantTag tag = cp->tag_at(index);
2539 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2540 }
2541 }
2542 JVM_END
2543
2544
2545 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2546 JVMWrapper("JVM_GetClassCPEntriesCount");
2547 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2548 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2549 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2550 JVM_END
2551
2552
2553 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2554 JVMWrapper("JVM_GetClassFieldsCount");
2555 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2556 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2557 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2558 JVM_END
2559
2560
2561 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2562 JVMWrapper("JVM_GetClassMethodsCount");
2563 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2564 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2565 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2566 JVM_END
2567
2568
2569 // The following methods, used for the verifier, are never called with
2570 // array klasses, so a direct cast to InstanceKlass is safe.
2571 // Typically, these methods are called in a loop with bounds determined
2572 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2573 // zero for arrays.
2574 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2575 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2576 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2577 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2578 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2579 int length = method->checked_exceptions_length();
2580 if (length > 0) {
2581 CheckedExceptionElement* table= method->checked_exceptions_start();
2582 for (int i = 0; i < length; i++) {
2583 exceptions[i] = table[i].class_cp_index;
2584 }
2585 }
2586 JVM_END
2587
2588
2589 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2590 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2591 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2592 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2593 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2594 return method->checked_exceptions_length();
2595 JVM_END
2596
2597
2598 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2599 JVMWrapper("JVM_GetMethodIxByteCode");
2600 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2601 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2602 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2603 memcpy(code, method->code_base(), method->code_size());
2604 JVM_END
2605
2606
2607 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2608 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2609 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2610 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2611 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2612 return method->code_size();
2613 JVM_END
2614
2615
2616 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2617 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2618 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2619 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2620 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2621 ExceptionTable extable(method);
2622 entry->start_pc = extable.start_pc(entry_index);
2623 entry->end_pc = extable.end_pc(entry_index);
2624 entry->handler_pc = extable.handler_pc(entry_index);
2625 entry->catchType = extable.catch_type_index(entry_index);
2626 JVM_END
2627
2628
2629 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2630 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2631 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2632 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2633 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2634 return method->exception_table_length();
2635 JVM_END
2636
2637
2638 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2639 JVMWrapper("JVM_GetMethodIxModifiers");
2640 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2641 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2642 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2643 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2644 JVM_END
2645
2646
2647 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2648 JVMWrapper("JVM_GetFieldIxModifiers");
2649 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2650 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2651 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2652 JVM_END
2653
2654
2655 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2656 JVMWrapper("JVM_GetMethodIxLocalsCount");
2657 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2658 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2659 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2660 return method->max_locals();
2661 JVM_END
2662
2663
2664 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2665 JVMWrapper("JVM_GetMethodIxArgsSize");
2666 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2667 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2668 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2669 return method->size_of_parameters();
2670 JVM_END
2671
2672
2673 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2674 JVMWrapper("JVM_GetMethodIxMaxStack");
2675 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2676 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2677 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2678 return method->verifier_max_stack();
2679 JVM_END
2680
2681
2682 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2683 JVMWrapper("JVM_IsConstructorIx");
2684 ResourceMark rm(THREAD);
2685 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2686 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2687 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2688 return method->name() == vmSymbols::object_initializer_name();
2689 JVM_END
2690
2691
2692 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2693 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2694 ResourceMark rm(THREAD);
2695 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2696 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2697 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2698 return method->is_overpass();
2699 JVM_END
2700
2701 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2702 JVMWrapper("JVM_GetMethodIxIxUTF");
2703 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2704 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2705 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2706 return method->name()->as_utf8();
2707 JVM_END
2708
2709
2710 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2711 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2712 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2713 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2714 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2715 return method->signature()->as_utf8();
2716 JVM_END
2717
2718 /**
2719 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2720 * read entries in the constant pool. Since the old verifier always
2721 * works on a copy of the code, it will not see any rewriting that
2722 * may possibly occur in the middle of verification. So it is important
2723 * that nothing it calls tries to use the cpCache instead of the raw
2724 * constant pool, so we must use cp->uncached_x methods when appropriate.
2725 */
2726 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2727 JVMWrapper("JVM_GetCPFieldNameUTF");
2728 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2729 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2730 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2731 switch (cp->tag_at(cp_index).value()) {
2732 case JVM_CONSTANT_Fieldref:
2733 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2734 default:
2735 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2736 }
2737 ShouldNotReachHere();
2738 return NULL;
2739 JVM_END
2740
2741
2742 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2743 JVMWrapper("JVM_GetCPMethodNameUTF");
2744 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2745 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2746 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2747 switch (cp->tag_at(cp_index).value()) {
2748 case JVM_CONSTANT_InterfaceMethodref:
2749 case JVM_CONSTANT_Methodref:
2750 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2751 default:
2752 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2753 }
2754 ShouldNotReachHere();
2755 return NULL;
2756 JVM_END
2757
2758
2759 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2760 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2761 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2762 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2763 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2764 switch (cp->tag_at(cp_index).value()) {
2765 case JVM_CONSTANT_InterfaceMethodref:
2766 case JVM_CONSTANT_Methodref:
2767 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2768 default:
2769 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2770 }
2771 ShouldNotReachHere();
2772 return NULL;
2773 JVM_END
2774
2775
2776 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2777 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2778 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2779 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2780 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2781 switch (cp->tag_at(cp_index).value()) {
2782 case JVM_CONSTANT_Fieldref:
2783 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2784 default:
2785 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2786 }
2787 ShouldNotReachHere();
2788 return NULL;
2789 JVM_END
2790
2791
2792 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2793 JVMWrapper("JVM_GetCPClassNameUTF");
2794 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2795 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2796 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2797 Symbol* classname = cp->klass_name_at(cp_index);
2798 return classname->as_utf8();
2799 JVM_END
2800
2801
2802 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2803 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2804 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2805 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2806 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2807 switch (cp->tag_at(cp_index).value()) {
2808 case JVM_CONSTANT_Fieldref: {
2809 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2810 Symbol* classname = cp->klass_name_at(class_index);
2811 return classname->as_utf8();
2812 }
2813 default:
2814 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2815 }
2816 ShouldNotReachHere();
2817 return NULL;
2818 JVM_END
2819
2820
2821 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2822 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2823 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2824 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2825 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2826 switch (cp->tag_at(cp_index).value()) {
2827 case JVM_CONSTANT_Methodref:
2828 case JVM_CONSTANT_InterfaceMethodref: {
2829 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2830 Symbol* classname = cp->klass_name_at(class_index);
2831 return classname->as_utf8();
2832 }
2833 default:
2834 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2835 }
2836 ShouldNotReachHere();
2837 return NULL;
2838 JVM_END
2839
2840
2841 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2842 JVMWrapper("JVM_GetCPFieldModifiers");
2843 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2844 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2845 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2846 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2847 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2848 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2849 switch (cp->tag_at(cp_index).value()) {
2850 case JVM_CONSTANT_Fieldref: {
2851 Symbol* name = cp->uncached_name_ref_at(cp_index);
2852 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2853 InstanceKlass* ik = InstanceKlass::cast(k_called);
2854 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2855 if (fs.name() == name && fs.signature() == signature) {
2856 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2857 }
2858 }
2859 return -1;
2860 }
2861 default:
2862 fatal("JVM_GetCPFieldModifiers: illegal constant");
2863 }
2864 ShouldNotReachHere();
2865 return 0;
2866 JVM_END
2867
2868
2869 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2870 JVMWrapper("JVM_GetCPMethodModifiers");
2871 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2872 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2873 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2874 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2875 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2876 switch (cp->tag_at(cp_index).value()) {
2877 case JVM_CONSTANT_Methodref:
2878 case JVM_CONSTANT_InterfaceMethodref: {
2879 Symbol* name = cp->uncached_name_ref_at(cp_index);
2880 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2881 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2882 int methods_count = methods->length();
2883 for (int i = 0; i < methods_count; i++) {
2884 Method* method = methods->at(i);
2885 if (method->name() == name && method->signature() == signature) {
2886 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2887 }
2888 }
2889 return -1;
2890 }
2891 default:
2892 fatal("JVM_GetCPMethodModifiers: illegal constant");
2893 }
2894 ShouldNotReachHere();
2895 return 0;
2896 JVM_END
2897
2898
2899 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2900
2901 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2902 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2903 JVM_END
2904
2905
2906 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2907 JVMWrapper("JVM_IsSameClassPackage");
2908 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2909 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2910 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2911 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2912 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2913 JVM_END
2914
2915 // Printing support //////////////////////////////////////////////////
2916 extern "C" {
2917
2918 ATTRIBUTE_PRINTF(3, 0)
2919 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2920 // Reject count values that are negative signed values converted to
2921 // unsigned; see bug 4399518, 4417214
2922 if ((intptr_t)count <= 0) return -1;
2923
2924 int result = os::vsnprintf(str, count, fmt, args);
2925 if (result > 0 && (size_t)result >= count) {
2926 result = -1;
2927 }
2928
2929 return result;
2930 }
2931
2932 ATTRIBUTE_PRINTF(3, 4)
2933 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2934 va_list args;
2935 int len;
2936 va_start(args, fmt);
2937 len = jio_vsnprintf(str, count, fmt, args);
2938 va_end(args);
2939 return len;
2940 }
2941
2942 ATTRIBUTE_PRINTF(2, 3)
2943 int jio_fprintf(FILE* f, const char *fmt, ...) {
2944 int len;
2945 va_list args;
2946 va_start(args, fmt);
2947 len = jio_vfprintf(f, fmt, args);
2948 va_end(args);
2949 return len;
2950 }
2951
2952 ATTRIBUTE_PRINTF(2, 0)
2953 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2954 if (Arguments::vfprintf_hook() != NULL) {
2955 return Arguments::vfprintf_hook()(f, fmt, args);
2956 } else {
2957 return vfprintf(f, fmt, args);
2958 }
2959 }
2960
2961 ATTRIBUTE_PRINTF(1, 2)
2962 JNIEXPORT int jio_printf(const char *fmt, ...) {
2963 int len;
2964 va_list args;
2965 va_start(args, fmt);
2966 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2967 va_end(args);
2968 return len;
2969 }
2970
2971 // HotSpot specific jio method
2972 void jio_print(const char* s, size_t len) {
2973 // Try to make this function as atomic as possible.
2974 if (Arguments::vfprintf_hook() != NULL) {
2975 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2976 } else {
2977 // Make an unused local variable to avoid warning from gcc compiler.
2978 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2979 }
2980 }
2981
2982 } // Extern C
2983
2984 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2985
2986 // In most of the JVM thread support functions we need to access the
2987 // thread through a ThreadsListHandle to prevent it from exiting and
2988 // being reclaimed while we try to operate on it. The exceptions to this
2989 // rule are when operating on the current thread, or if the monitor of
2990 // the target java.lang.Thread is locked at the Java level - in both
2991 // cases the target cannot exit.
2992
2993 static void thread_entry(JavaThread* thread, TRAPS) {
2994 HandleMark hm(THREAD);
2995 Handle obj(THREAD, thread->threadObj());
2996 JavaValue result(T_VOID);
2997 JavaCalls::call_virtual(&result,
2998 obj,
2999 SystemDictionary::Thread_klass(),
3000 vmSymbols::run_method_name(),
3001 vmSymbols::void_method_signature(),
3002 THREAD);
3003 }
3004
3005
3006 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3007 JVMWrapper("JVM_StartThread");
3008 JavaThread *native_thread = NULL;
3009
3010 // We cannot hold the Threads_lock when we throw an exception,
3011 // due to rank ordering issues. Example: we might need to grab the
3012 // Heap_lock while we construct the exception.
3013 bool throw_illegal_thread_state = false;
3014
3015 // We must release the Threads_lock before we can post a jvmti event
3016 // in Thread::start.
3017 {
3018 // Ensure that the C++ Thread and OSThread structures aren't freed before
3019 // we operate.
3020 MutexLocker mu(Threads_lock);
3021
3022 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3023 // re-starting an already started thread, so we should usually find
3024 // that the JavaThread is null. However for a JNI attached thread
3025 // there is a small window between the Thread object being created
3026 // (with its JavaThread set) and the update to its threadStatus, so we
3027 // have to check for this
3028 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
3029 throw_illegal_thread_state = true;
3030 } else {
3031 // We could also check the stillborn flag to see if this thread was already stopped, but
3032 // for historical reasons we let the thread detect that itself when it starts running
3033
3034 jlong size =
3035 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3036 // Allocate the C++ Thread structure and create the native thread. The
3037 // stack size retrieved from java is 64-bit signed, but the constructor takes
3038 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3039 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3040 // - Avoid passing negative values which would result in really large stacks.
3041 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3042 size_t sz = size > 0 ? (size_t) size : 0;
3043 native_thread = new JavaThread(&thread_entry, sz);
3044
3045 // At this point it may be possible that no osthread was created for the
3046 // JavaThread due to lack of memory. Check for this situation and throw
3047 // an exception if necessary. Eventually we may want to change this so
3048 // that we only grab the lock if the thread was created successfully -
3049 // then we can also do this check and throw the exception in the
3050 // JavaThread constructor.
3051 if (native_thread->osthread() != NULL) {
3052 // Note: the current thread is not being used within "prepare".
3053 native_thread->prepare(jthread);
3054 }
3055 }
3056 }
3057
3058 if (throw_illegal_thread_state) {
3059 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3060 }
3061
3062 assert(native_thread != NULL, "Starting null thread?");
3063
3064 if (native_thread->osthread() == NULL) {
3065 // No one should hold a reference to the 'native_thread'.
3066 native_thread->smr_delete();
3067 if (JvmtiExport::should_post_resource_exhausted()) {
3068 JvmtiExport::post_resource_exhausted(
3069 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3070 os::native_thread_creation_failed_msg());
3071 }
3072 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3073 os::native_thread_creation_failed_msg());
3074 }
3075
3076 #if INCLUDE_JFR
3077 if (JfrRecorder::is_recording() && EventThreadStart::is_enabled() &&
3078 EventThreadStart::is_stacktrace_enabled()) {
3079 JfrThreadLocal* tl = native_thread->jfr_thread_local();
3080 // skip Thread.start() and Thread.start0()
3081 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2));
3082 }
3083 #endif
3084
3085 Thread::start(native_thread);
3086
3087 JVM_END
3088
3089
3090 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3091 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
3092 // but is thought to be reliable and simple. In the case, where the receiver is the
3093 // same thread as the sender, no VM_Operation is needed.
3094 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3095 JVMWrapper("JVM_StopThread");
3096
3097 // A nested ThreadsListHandle will grab the Threads_lock so create
3098 // tlh before we resolve throwable.
3099 ThreadsListHandle tlh(thread);
3100 oop java_throwable = JNIHandles::resolve(throwable);
3101 if (java_throwable == NULL) {
3102 THROW(vmSymbols::java_lang_NullPointerException());
3103 }
3104 oop java_thread = NULL;
3105 JavaThread* receiver = NULL;
3106 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3107 Events::log_exception(thread,
3108 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3109 p2i(receiver), p2i(java_thread), p2i(throwable));
3110
3111 if (is_alive) {
3112 // jthread refers to a live JavaThread.
3113 if (thread == receiver) {
3114 // Exception is getting thrown at self so no VM_Operation needed.
3115 THROW_OOP(java_throwable);
3116 } else {
3117 // Use a VM_Operation to throw the exception.
3118 Thread::send_async_exception(java_thread, java_throwable);
3119 }
3120 } else {
3121 // Either:
3122 // - target thread has not been started before being stopped, or
3123 // - target thread already terminated
3124 // We could read the threadStatus to determine which case it is
3125 // but that is overkill as it doesn't matter. We must set the
3126 // stillborn flag for the first case, and if the thread has already
3127 // exited setting this flag has no effect.
3128 java_lang_Thread::set_stillborn(java_thread);
3129 }
3130 JVM_END
3131
3132
3133 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3134 JVMWrapper("JVM_IsThreadAlive");
3135
3136 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3137 return java_lang_Thread::is_alive(thread_oop);
3138 JVM_END
3139
3140
3141 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3142 JVMWrapper("JVM_SuspendThread");
3143
3144 ThreadsListHandle tlh(thread);
3145 JavaThread* receiver = NULL;
3146 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3147 if (is_alive) {
3148 // jthread refers to a live JavaThread.
3149 {
3150 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3151 if (receiver->is_external_suspend()) {
3152 // Don't allow nested external suspend requests. We can't return
3153 // an error from this interface so just ignore the problem.
3154 return;
3155 }
3156 if (receiver->is_exiting()) { // thread is in the process of exiting
3157 return;
3158 }
3159 receiver->set_external_suspend();
3160 }
3161
3162 // java_suspend() will catch threads in the process of exiting
3163 // and will ignore them.
3164 receiver->java_suspend();
3165
3166 // It would be nice to have the following assertion in all the
3167 // time, but it is possible for a racing resume request to have
3168 // resumed this thread right after we suspended it. Temporarily
3169 // enable this assertion if you are chasing a different kind of
3170 // bug.
3171 //
3172 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3173 // receiver->is_being_ext_suspended(), "thread is not suspended");
3174 }
3175 JVM_END
3176
3177
3178 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3179 JVMWrapper("JVM_ResumeThread");
3180
3181 ThreadsListHandle tlh(thread);
3182 JavaThread* receiver = NULL;
3183 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3184 if (is_alive) {
3185 // jthread refers to a live JavaThread.
3186
3187 // This is the original comment for this Threads_lock grab:
3188 // We need to *always* get the threads lock here, since this operation cannot be allowed during
3189 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3190 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3191 // looks at it.
3192 //
3193 // The above comment dates back to when we had both internal and
3194 // external suspend APIs that shared a common underlying mechanism.
3195 // External suspend is now entirely cooperative and doesn't share
3196 // anything with internal suspend. That said, there are some
3197 // assumptions in the VM that an external resume grabs the
3198 // Threads_lock. We can't drop the Threads_lock grab here until we
3199 // resolve the assumptions that exist elsewhere.
3200 //
3201 MutexLocker ml(Threads_lock);
3202 receiver->java_resume();
3203 }
3204 JVM_END
3205
3206
3207 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3208 JVMWrapper("JVM_SetThreadPriority");
3209
3210 ThreadsListHandle tlh(thread);
3211 oop java_thread = NULL;
3212 JavaThread* receiver = NULL;
3213 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3214 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3215
3216 if (is_alive) {
3217 // jthread refers to a live JavaThread.
3218 Thread::set_priority(receiver, (ThreadPriority)prio);
3219 }
3220 // Implied else: If the JavaThread hasn't started yet, then the
3221 // priority set in the java.lang.Thread object above will be pushed
3222 // down when it does start.
3223 JVM_END
3224
3225
3226 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3227 JVMWrapper("JVM_Yield");
3228 if (os::dont_yield()) return;
3229 HOTSPOT_THREAD_YIELD();
3230 os::naked_yield();
3231 JVM_END
3232
3233 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3234 assert(event != NULL, "invariant");
3235 assert(event->should_commit(), "invariant");
3236 event->set_time(millis);
3237 event->commit();
3238 }
3239
3240 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3241 JVMWrapper("JVM_Sleep");
3242
3243 if (millis < 0) {
3244 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3245 }
3246
3247 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3248 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3249 }
3250
3251 // Save current thread state and restore it at the end of this block.
3252 // And set new thread state to SLEEPING.
3253 JavaThreadSleepState jtss(thread);
3254
3255 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3256 EventThreadSleep event;
3257
3258 if (millis == 0) {
3259 os::naked_yield();
3260 } else {
3261 ThreadState old_state = thread->osthread()->get_state();
3262 thread->osthread()->set_state(SLEEPING);
3263 if (!thread->sleep(millis)) { // interrupted
3264 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3265 // us while we were sleeping. We do not overwrite those.
3266 if (!HAS_PENDING_EXCEPTION) {
3267 if (event.should_commit()) {
3268 post_thread_sleep_event(&event, millis);
3269 }
3270 HOTSPOT_THREAD_SLEEP_END(1);
3271
3272 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3273 // to properly restore the thread state. That's likely wrong.
3274 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3275 }
3276 }
3277 thread->osthread()->set_state(old_state);
3278 }
3279 if (event.should_commit()) {
3280 post_thread_sleep_event(&event, millis);
3281 }
3282 HOTSPOT_THREAD_SLEEP_END(0);
3283 JVM_END
3284
3285 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3286 JVMWrapper("JVM_CurrentThread");
3287 oop jthread = thread->threadObj();
3288 assert (thread != NULL, "no current thread!");
3289 return JNIHandles::make_local(env, jthread);
3290 JVM_END
3291
3292 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3293 JVMWrapper("JVM_Interrupt");
3294
3295 ThreadsListHandle tlh(thread);
3296 JavaThread* receiver = NULL;
3297 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3298 if (is_alive) {
3299 // jthread refers to a live JavaThread.
3300 receiver->interrupt();
3301 }
3302 JVM_END
3303
3304
3305 // Return true iff the current thread has locked the object passed in
3306
3307 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3308 JVMWrapper("JVM_HoldsLock");
3309 assert(THREAD->is_Java_thread(), "sanity check");
3310 if (obj == NULL) {
3311 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3312 }
3313 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3314 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3315 JVM_END
3316
3317
3318 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3319 JVMWrapper("JVM_DumpAllStacks");
3320 VM_PrintThreads op;
3321 VMThread::execute(&op);
3322 if (JvmtiExport::should_post_data_dump()) {
3323 JvmtiExport::post_data_dump();
3324 }
3325 JVM_END
3326
3327 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3328 JVMWrapper("JVM_SetNativeThreadName");
3329
3330 // We don't use a ThreadsListHandle here because the current thread
3331 // must be alive.
3332 oop java_thread = JNIHandles::resolve_non_null(jthread);
3333 JavaThread* thr = java_lang_Thread::thread(java_thread);
3334 if (thread == thr && !thr->has_attached_via_jni()) {
3335 // Thread naming is only supported for the current thread and
3336 // we don't set the name of an attached thread to avoid stepping
3337 // on other programs.
3338 ResourceMark rm(thread);
3339 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3340 os::set_native_thread_name(thread_name);
3341 }
3342 JVM_END
3343
3344 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3345
3346 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3347 JVMWrapper("JVM_GetClassContext");
3348 ResourceMark rm(THREAD);
3349 JvmtiVMObjectAllocEventCollector oam;
3350 vframeStream vfst(thread);
3351
3352 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3353 // This must only be called from SecurityManager.getClassContext
3354 Method* m = vfst.method();
3355 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3356 m->name() == vmSymbols::getClassContext_name() &&
3357 m->signature() == vmSymbols::void_class_array_signature())) {
3358 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3359 }
3360 }
3361
3362 // Collect method holders
3363 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3364 for (; !vfst.at_end(); vfst.security_next()) {
3365 Method* m = vfst.method();
3366 // Native frames are not returned
3367 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3368 Klass* holder = m->method_holder();
3369 assert(holder->is_klass(), "just checking");
3370 klass_array->append(holder);
3371 }
3372 }
3373
3374 // Create result array of type [Ljava/lang/Class;
3375 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3376 // Fill in mirrors corresponding to method holders
3377 for (int i = 0; i < klass_array->length(); i++) {
3378 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3379 }
3380
3381 return (jobjectArray) JNIHandles::make_local(env, result);
3382 JVM_END
3383
3384
3385 // java.lang.Package ////////////////////////////////////////////////////////////////
3386
3387
3388 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3389 JVMWrapper("JVM_GetSystemPackage");
3390 ResourceMark rm(THREAD);
3391 JvmtiVMObjectAllocEventCollector oam;
3392 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3393 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3394 return (jstring) JNIHandles::make_local(result);
3395 JVM_END
3396
3397
3398 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3399 JVMWrapper("JVM_GetSystemPackages");
3400 JvmtiVMObjectAllocEventCollector oam;
3401 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3402 return (jobjectArray) JNIHandles::make_local(result);
3403 JVM_END
3404
3405
3406 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3407
3408
3409 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3410 JVMWrapper("JVM_GetAndClearReferencePendingList");
3411
3412 MonitorLocker ml(Heap_lock);
3413 oop ref = Universe::reference_pending_list();
3414 if (ref != NULL) {
3415 Universe::set_reference_pending_list(NULL);
3416 }
3417 return JNIHandles::make_local(env, ref);
3418 JVM_END
3419
3420 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3421 JVMWrapper("JVM_HasReferencePendingList");
3422 MonitorLocker ml(Heap_lock);
3423 return Universe::has_reference_pending_list();
3424 JVM_END
3425
3426 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3427 JVMWrapper("JVM_WaitForReferencePendingList");
3428 MonitorLocker ml(Heap_lock);
3429 while (!Universe::has_reference_pending_list()) {
3430 ml.wait();
3431 }
3432 JVM_END
3433
3434
3435 // ObjectInputStream ///////////////////////////////////////////////////////////////
3436
3437 // Return the first user-defined class loader up the execution stack, or null
3438 // if only code from the bootstrap or platform class loader is on the stack.
3439
3440 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3441 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3442 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3443 oop loader = vfst.method()->method_holder()->class_loader();
3444 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3445 return JNIHandles::make_local(env, loader);
3446 }
3447 }
3448 return NULL;
3449 JVM_END
3450
3451
3452 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3453
3454
3455 // resolve array handle and check arguments
3456 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3457 if (arr == NULL) {
3458 THROW_0(vmSymbols::java_lang_NullPointerException());
3459 }
3460 oop a = JNIHandles::resolve_non_null(arr);
3461 if (!a->is_array()) {
3462 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3463 } else if (type_array_only && !a->is_typeArray()) {
3464 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3465 }
3466 return arrayOop(a);
3467 }
3468
3469
3470 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3471 JVMWrapper("JVM_GetArrayLength");
3472 arrayOop a = check_array(env, arr, false, CHECK_0);
3473 return a->length();
3474 JVM_END
3475
3476
3477 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3478 JVMWrapper("JVM_Array_Get");
3479 JvmtiVMObjectAllocEventCollector oam;
3480 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3481 jvalue value;
3482 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3483 oop box = Reflection::box(&value, type, CHECK_NULL);
3484 return JNIHandles::make_local(env, box);
3485 JVM_END
3486
3487
3488 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3489 JVMWrapper("JVM_GetPrimitiveArrayElement");
3490 jvalue value;
3491 value.i = 0; // to initialize value before getting used in CHECK
3492 arrayOop a = check_array(env, arr, true, CHECK_(value));
3493 assert(a->is_typeArray(), "just checking");
3494 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3495 BasicType wide_type = (BasicType) wCode;
3496 if (type != wide_type) {
3497 Reflection::widen(&value, type, wide_type, CHECK_(value));
3498 }
3499 return value;
3500 JVM_END
3501
3502
3503 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3504 JVMWrapper("JVM_SetArrayElement");
3505 arrayOop a = check_array(env, arr, false, CHECK);
3506 oop box = JNIHandles::resolve(val);
3507 jvalue value;
3508 value.i = 0; // to initialize value before getting used in CHECK
3509 BasicType value_type;
3510 if (a->is_objArray()) {
3511 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3512 value_type = Reflection::unbox_for_regular_object(box, &value);
3513 } else {
3514 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3515 }
3516 Reflection::array_set(&value, a, index, value_type, CHECK);
3517 JVM_END
3518
3519
3520 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3521 JVMWrapper("JVM_SetPrimitiveArrayElement");
3522 arrayOop a = check_array(env, arr, true, CHECK);
3523 assert(a->is_typeArray(), "just checking");
3524 BasicType value_type = (BasicType) vCode;
3525 Reflection::array_set(&v, a, index, value_type, CHECK);
3526 JVM_END
3527
3528
3529 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3530 JVMWrapper("JVM_NewArray");
3531 JvmtiVMObjectAllocEventCollector oam;
3532 oop element_mirror = JNIHandles::resolve(eltClass);
3533 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3534 return JNIHandles::make_local(env, result);
3535 JVM_END
3536
3537
3538 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3539 JVMWrapper("JVM_NewMultiArray");
3540 JvmtiVMObjectAllocEventCollector oam;
3541 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3542 oop element_mirror = JNIHandles::resolve(eltClass);
3543 assert(dim_array->is_typeArray(), "just checking");
3544 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3545 return JNIHandles::make_local(env, result);
3546 JVM_END
3547
3548
3549 // Library support ///////////////////////////////////////////////////////////////////////////
3550
3551 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3552 //%note jvm_ct
3553 JVMWrapper("JVM_LoadLibrary");
3554 char ebuf[1024];
3555 void *load_result;
3556 {
3557 ThreadToNativeFromVM ttnfvm(thread);
3558 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3559 }
3560 if (load_result == NULL) {
3561 char msg[1024];
3562 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3563 // Since 'ebuf' may contain a string encoded using
3564 // platform encoding scheme, we need to pass
3565 // Exceptions::unsafe_to_utf8 to the new_exception method
3566 // as the last argument. See bug 6367357.
3567 Handle h_exception =
3568 Exceptions::new_exception(thread,
3569 vmSymbols::java_lang_UnsatisfiedLinkError(),
3570 msg, Exceptions::unsafe_to_utf8);
3571
3572 THROW_HANDLE_0(h_exception);
3573 }
3574 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3575 return load_result;
3576 JVM_END
3577
3578
3579 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3580 JVMWrapper("JVM_UnloadLibrary");
3581 os::dll_unload(handle);
3582 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3583 JVM_END
3584
3585
3586 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3587 JVMWrapper("JVM_FindLibraryEntry");
3588 void* find_result = os::dll_lookup(handle, name);
3589 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3590 find_result != NULL ? "Found" : "Failed to find",
3591 name, p2i(handle));
3592 return find_result;
3593 JVM_END
3594
3595
3596 // JNI version ///////////////////////////////////////////////////////////////////////////////
3597
3598 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3599 JVMWrapper("JVM_IsSupportedJNIVersion");
3600 return Threads::is_supported_jni_version_including_1_1(version);
3601 JVM_END
3602
3603
3604 // String support ///////////////////////////////////////////////////////////////////////////
3605
3606 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3607 JVMWrapper("JVM_InternString");
3608 JvmtiVMObjectAllocEventCollector oam;
3609 if (str == NULL) return NULL;
3610 oop string = JNIHandles::resolve_non_null(str);
3611 oop result = StringTable::intern(string, CHECK_NULL);
3612 return (jstring) JNIHandles::make_local(env, result);
3613 JVM_END
3614
3615
3616 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3617
3618 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3619 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3620 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3621 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3622 // nature. JavaThreads will be "in native" when using this API from JDK code.
3623
3624
3625 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3626 VM_Exit::block_if_vm_exited();
3627 JVMWrapper("JVM_RawMonitorCreate");
3628 return new os::PlatformMutex();
3629 }
3630
3631
3632 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3633 VM_Exit::block_if_vm_exited();
3634 JVMWrapper("JVM_RawMonitorDestroy");
3635 delete ((os::PlatformMutex*) mon);
3636 }
3637
3638
3639 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3640 VM_Exit::block_if_vm_exited();
3641 JVMWrapper("JVM_RawMonitorEnter");
3642 ((os::PlatformMutex*) mon)->lock();
3643 return 0;
3644 }
3645
3646
3647 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3648 VM_Exit::block_if_vm_exited();
3649 JVMWrapper("JVM_RawMonitorExit");
3650 ((os::PlatformMutex*) mon)->unlock();
3651 }
3652
3653
3654 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3655
3656 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3657 Handle loader, Handle protection_domain,
3658 jboolean throwError, TRAPS) {
3659 // Security Note:
3660 // The Java level wrapper will perform the necessary security check allowing
3661 // us to pass the NULL as the initiating class loader. The VM is responsible for
3662 // the checkPackageAccess relative to the initiating class loader via the
3663 // protection_domain. The protection_domain is passed as NULL by the java code
3664 // if there is no security manager in 3-arg Class.forName().
3665 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3666
3667 // Check if we should initialize the class
3668 if (init && klass->is_instance_klass()) {
3669 klass->initialize(CHECK_NULL);
3670 }
3671 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3672 }
3673
3674
3675 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3676
3677 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3678 JVMWrapper("JVM_InvokeMethod");
3679 Handle method_handle;
3680 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3681 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3682 Handle receiver(THREAD, JNIHandles::resolve(obj));
3683 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3684 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3685 jobject res = JNIHandles::make_local(env, result);
3686 if (JvmtiExport::should_post_vm_object_alloc()) {
3687 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3688 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3689 if (java_lang_Class::is_primitive(ret_type)) {
3690 // Only for primitive type vm allocates memory for java object.
3691 // See box() method.
3692 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3693 }
3694 }
3695 return res;
3696 } else {
3697 THROW_0(vmSymbols::java_lang_StackOverflowError());
3698 }
3699 JVM_END
3700
3701
3702 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3703 JVMWrapper("JVM_NewInstanceFromConstructor");
3704 oop constructor_mirror = JNIHandles::resolve(c);
3705 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3706 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3707 jobject res = JNIHandles::make_local(env, result);
3708 if (JvmtiExport::should_post_vm_object_alloc()) {
3709 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3710 }
3711 return res;
3712 JVM_END
3713
3714 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3715
3716 JVM_LEAF(jboolean, JVM_SupportsCX8())
3717 JVMWrapper("JVM_SupportsCX8");
3718 return VM_Version::supports_cx8();
3719 JVM_END
3720
3721 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3722 JVMWrapper("JVM_InitializeFromArchive");
3723 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3724 assert(k->is_klass(), "just checking");
3725 HeapShared::initialize_from_archived_subgraph(k);
3726 JVM_END
3727
3728 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForCDSDump())
3729 JVMWrapper("JVM_GetRandomSeedForCDSDump");
3730 if (DumpSharedSpaces) {
3731 const char* release = Abstract_VM_Version::vm_release();
3732 const char* dbg_level = Abstract_VM_Version::jdk_debug_level();
3733 const char* version = VM_Version::internal_vm_info_string();
3734 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3735 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3736 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3737 seed += (jlong)Abstract_VM_Version::vm_major_version();
3738 seed += (jlong)Abstract_VM_Version::vm_minor_version();
3739 seed += (jlong)Abstract_VM_Version::vm_security_version();
3740 seed += (jlong)Abstract_VM_Version::vm_patch_version();
3741 if (seed == 0) { // don't let this ever be zero.
3742 seed = 0x87654321;
3743 }
3744 log_debug(cds)("JVM_GetRandomSeedForCDSDump() = " JLONG_FORMAT, seed);
3745 return seed;
3746 } else {
3747 return 0;
3748 }
3749 JVM_END
3750
3751 // Returns an array of all live Thread objects (VM internal JavaThreads,
3752 // jvmti agent threads, and JNI attaching threads are skipped)
3753 // See CR 6404306 regarding JNI attaching threads
3754 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3755 ResourceMark rm(THREAD);
3756 ThreadsListEnumerator tle(THREAD, false, false);
3757 JvmtiVMObjectAllocEventCollector oam;
3758
3759 int num_threads = tle.num_threads();
3760 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3761 objArrayHandle threads_ah(THREAD, r);
3762
3763 for (int i = 0; i < num_threads; i++) {
3764 Handle h = tle.get_threadObj(i);
3765 threads_ah->obj_at_put(i, h());
3766 }
3767
3768 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3769 JVM_END
3770
3771
3772 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3773 // Return StackTraceElement[][], each element is the stack trace of a thread in
3774 // the corresponding entry in the given threads array
3775 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3776 JVMWrapper("JVM_DumpThreads");
3777 JvmtiVMObjectAllocEventCollector oam;
3778
3779 // Check if threads is null
3780 if (threads == NULL) {
3781 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3782 }
3783
3784 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3785 objArrayHandle ah(THREAD, a);
3786 int num_threads = ah->length();
3787 // check if threads is non-empty array
3788 if (num_threads == 0) {
3789 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3790 }
3791
3792 // check if threads is not an array of objects of Thread class
3793 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3794 if (k != SystemDictionary::Thread_klass()) {
3795 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3796 }
3797
3798 ResourceMark rm(THREAD);
3799
3800 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3801 for (int i = 0; i < num_threads; i++) {
3802 oop thread_obj = ah->obj_at(i);
3803 instanceHandle h(THREAD, (instanceOop) thread_obj);
3804 thread_handle_array->append(h);
3805 }
3806
3807 // The JavaThread references in thread_handle_array are validated
3808 // in VM_ThreadDump::doit().
3809 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3810 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3811
3812 JVM_END
3813
3814 // JVM monitoring and management support
3815 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3816 return Management::get_jmm_interface(version);
3817 JVM_END
3818
3819 // com.sun.tools.attach.VirtualMachine agent properties support
3820 //
3821 // Initialize the agent properties with the properties maintained in the VM
3822 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3823 JVMWrapper("JVM_InitAgentProperties");
3824 ResourceMark rm;
3825
3826 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3827
3828 PUTPROP(props, "sun.java.command", Arguments::java_command());
3829 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3830 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3831 return properties;
3832 JVM_END
3833
3834 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3835 {
3836 JVMWrapper("JVM_GetEnclosingMethodInfo");
3837 JvmtiVMObjectAllocEventCollector oam;
3838
3839 if (ofClass == NULL) {
3840 return NULL;
3841 }
3842 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3843 // Special handling for primitive objects
3844 if (java_lang_Class::is_primitive(mirror())) {
3845 return NULL;
3846 }
3847 Klass* k = java_lang_Class::as_Klass(mirror());
3848 if (!k->is_instance_klass()) {
3849 return NULL;
3850 }
3851 InstanceKlass* ik = InstanceKlass::cast(k);
3852 int encl_method_class_idx = ik->enclosing_method_class_index();
3853 if (encl_method_class_idx == 0) {
3854 return NULL;
3855 }
3856 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3857 objArrayHandle dest(THREAD, dest_o);
3858 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3859 dest->obj_at_put(0, enc_k->java_mirror());
3860 int encl_method_method_idx = ik->enclosing_method_method_index();
3861 if (encl_method_method_idx != 0) {
3862 Symbol* sym = ik->constants()->symbol_at(
3863 extract_low_short_from_int(
3864 ik->constants()->name_and_type_at(encl_method_method_idx)));
3865 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3866 dest->obj_at_put(1, str());
3867 sym = ik->constants()->symbol_at(
3868 extract_high_short_from_int(
3869 ik->constants()->name_and_type_at(encl_method_method_idx)));
3870 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3871 dest->obj_at_put(2, str());
3872 }
3873 return (jobjectArray) JNIHandles::make_local(dest());
3874 }
3875 JVM_END
3876
3877 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3878 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3879 ResourceMark rm(THREAD);
3880
3881 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3882 return NULL;
3883 }
3884
3885 char** vm_flags = Arguments::jvm_flags_array();
3886 char** vm_args = Arguments::jvm_args_array();
3887 int num_flags = Arguments::num_jvm_flags();
3888 int num_args = Arguments::num_jvm_args();
3889
3890 InstanceKlass* ik = SystemDictionary::String_klass();
3891 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3892 objArrayHandle result_h(THREAD, r);
3893
3894 int index = 0;
3895 for (int j = 0; j < num_flags; j++, index++) {
3896 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3897 result_h->obj_at_put(index, h());
3898 }
3899 for (int i = 0; i < num_args; i++, index++) {
3900 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3901 result_h->obj_at_put(index, h());
3902 }
3903 return (jobjectArray) JNIHandles::make_local(env, result_h());
3904 JVM_END
3905
3906 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3907 return os::get_signal_number(name);
3908 JVM_END