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.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/javaAssertions.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/modules.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/stringTable.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "gc/shared/collectedHeap.inline.hpp"
41 #include "interpreter/bytecode.hpp"
42 #include "interpreter/bytecodeUtils.hpp"
43 #include "jfr/jfrEvents.hpp"
44 #include "logging/log.hpp"
45 #include "memory/dynamicArchive.hpp"
46 #include "memory/heapShared.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/referenceType.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/access.inline.hpp"
52 #include "oops/constantPool.hpp"
53 #include "oops/fieldStreams.inline.hpp"
54 #include "oops/instanceKlass.hpp"
55 #include "oops/method.hpp"
56 #include "oops/recordComponent.hpp"
57 #include "oops/objArrayKlass.hpp"
58 #include "oops/objArrayOop.inline.hpp"
59 #include "oops/oop.inline.hpp"
60 #include "prims/jvm_misc.hpp"
61 #include "prims/jvmtiExport.hpp"
62 #include "prims/jvmtiThreadState.hpp"
63 #include "prims/nativeLookup.hpp"
64 #include "prims/stackwalk.hpp"
65 #include "runtime/arguments.hpp"
66 #include "runtime/atomic.hpp"
67 #include "runtime/handles.inline.hpp"
68 #include "runtime/init.hpp"
69 #include "runtime/interfaceSupport.inline.hpp"
70 #include "runtime/deoptimization.hpp"
71 #include "runtime/handshake.hpp"
72 #include "runtime/java.hpp"
73 #include "runtime/javaCalls.hpp"
74 #include "runtime/jfieldIDWorkaround.hpp"
75 #include "runtime/jniHandles.inline.hpp"
76 #include "runtime/os.inline.hpp"
77 #include "runtime/perfData.hpp"
78 #include "runtime/reflection.hpp"
79 #include "runtime/synchronizer.hpp"
80 #include "runtime/thread.inline.hpp"
81 #include "runtime/threadSMR.hpp"
82 #include "runtime/vframe.inline.hpp"
83 #include "runtime/vmOperations.hpp"
84 #include "runtime/vm_version.hpp"
85 #include "services/attachListener.hpp"
86 #include "services/management.hpp"
87 #include "services/threadService.hpp"
88 #include "utilities/copy.hpp"
89 #include "utilities/defaultStream.hpp"
90 #include "utilities/dtrace.hpp"
91 #include "utilities/events.hpp"
92 #include "utilities/histogram.hpp"
93 #include "utilities/macros.hpp"
94 #include "utilities/utf8.hpp"
95 #if INCLUDE_CDS
96 #include "classfile/systemDictionaryShared.hpp"
97 #endif
98 #if INCLUDE_JFR
99 #include "jfr/jfr.hpp"
100 #endif
101
102 #include <errno.h>
103
104 /*
105 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
106 such ctors and calls MUST NOT come between an oop declaration/init and its
107 usage because if objects are move this may cause various memory stomps, bus
108 errors and segfaults. Here is a cookbook for causing so called "naked oop
109 failures":
110
111 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
112 JVMWrapper("JVM_GetClassDeclaredFields");
113
114 // Object address to be held directly in mirror & not visible to GC
115 oop mirror = JNIHandles::resolve_non_null(ofClass);
116
117 // If this ctor can hit a safepoint, moving objects around, then
118 ComplexConstructor foo;
119
120 // Boom! mirror may point to JUNK instead of the intended object
121 (some dereference of mirror)
122
123 // Here's another call that may block for GC, making mirror stale
124 MutexLocker ml(some_lock);
125
126 // And here's an initializer that can result in a stale oop
127 // all in one step.
128 oop o = call_that_can_throw_exception(TRAPS);
129
130
131 The solution is to keep the oop declaration BELOW the ctor or function
132 call that might cause a GC, do another resolve to reassign the oop, or
133 consider use of a Handle instead of an oop so there is immunity from object
134 motion. But note that the "QUICK" entries below do not have a handlemark
135 and thus can only support use of handles passed in.
136 */
137
138 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
139 ResourceMark rm;
140 int line_number = -1;
141 const char * source_file = NULL;
142 const char * trace = "explicit";
143 InstanceKlass* caller = NULL;
144 JavaThread* jthread = (JavaThread*) THREAD;
145 if (jthread->has_last_Java_frame()) {
146 vframeStream vfst(jthread);
147
148 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
149 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
150 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
151 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
152 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
153
154 Method* last_caller = NULL;
155
156 while (!vfst.at_end()) {
157 Method* m = vfst.method();
158 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
159 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
160 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
161 break;
162 }
163 last_caller = m;
164 vfst.next();
165 }
166 // if this is called from Class.forName0 and that is called from Class.forName,
167 // then print the caller of Class.forName. If this is Class.loadClass, then print
168 // that caller, otherwise keep quiet since this should be picked up elsewhere.
169 bool found_it = false;
170 if (!vfst.at_end() &&
171 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
172 vfst.method()->name() == vmSymbols::forName0_name()) {
173 vfst.next();
174 if (!vfst.at_end() &&
175 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
176 vfst.method()->name() == vmSymbols::forName_name()) {
177 vfst.next();
178 found_it = true;
179 }
180 } else if (last_caller != NULL &&
181 last_caller->method_holder()->name() ==
182 vmSymbols::java_lang_ClassLoader() &&
183 last_caller->name() == vmSymbols::loadClass_name()) {
184 found_it = true;
185 } else if (!vfst.at_end()) {
186 if (vfst.method()->is_native()) {
187 // JNI call
188 found_it = true;
189 }
190 }
191 if (found_it && !vfst.at_end()) {
192 // found the caller
193 caller = vfst.method()->method_holder();
194 line_number = vfst.method()->line_number_from_bci(vfst.bci());
195 if (line_number == -1) {
196 // show method name if it's a native method
197 trace = vfst.method()->name_and_sig_as_C_string();
198 }
199 Symbol* s = caller->source_file_name();
200 if (s != NULL) {
201 source_file = s->as_C_string();
202 }
203 }
204 }
205 if (caller != NULL) {
206 if (to_class != caller) {
207 const char * from = caller->external_name();
208 const char * to = to_class->external_name();
209 // print in a single call to reduce interleaving between threads
210 if (source_file != NULL) {
211 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
212 } else {
213 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
214 }
215 }
216 }
217 }
218
219 void trace_class_resolution(Klass* to_class) {
220 EXCEPTION_MARK;
221 trace_class_resolution_impl(to_class, THREAD);
222 if (HAS_PENDING_EXCEPTION) {
223 CLEAR_PENDING_EXCEPTION;
224 }
225 }
226
227 // Wrapper to trace JVM functions
228
229 #ifdef ASSERT
230 Histogram* JVMHistogram;
231 volatile int JVMHistogram_lock = 0;
232
233 class JVMHistogramElement : public HistogramElement {
234 public:
235 JVMHistogramElement(const char* name);
236 };
237
238 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
239 _name = elementName;
240 uintx count = 0;
241
242 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) {
243 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) {
244 count +=1;
245 if ( (WarnOnStalledSpinLock > 0)
246 && (count % WarnOnStalledSpinLock == 0)) {
247 warning("JVMHistogram_lock seems to be stalled");
248 }
249 }
250 }
251
252 if(JVMHistogram == NULL)
253 JVMHistogram = new Histogram("JVM Call Counts",100);
254
255 JVMHistogram->add_element(this);
256 Atomic::dec(&JVMHistogram_lock);
257 }
258
259 #define JVMCountWrapper(arg) \
260 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
261 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
262
263 #define JVMWrapper(arg) JVMCountWrapper(arg);
264 #else
265 #define JVMWrapper(arg)
266 #endif
267
268
269 // Interface version /////////////////////////////////////////////////////////////////////
270
271
272 JVM_LEAF(jint, JVM_GetInterfaceVersion())
273 return JVM_INTERFACE_VERSION;
274 JVM_END
275
276
277 // java.lang.System //////////////////////////////////////////////////////////////////////
278
279
280 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
281 JVMWrapper("JVM_CurrentTimeMillis");
282 return os::javaTimeMillis();
283 JVM_END
284
285 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
286 JVMWrapper("JVM_NanoTime");
287 return os::javaTimeNanos();
288 JVM_END
289
290 // The function below is actually exposed by jdk.internal.misc.VM and not
291 // java.lang.System, but we choose to keep it here so that it stays next
292 // to JVM_CurrentTimeMillis and JVM_NanoTime
293
294 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
295 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
296
297 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
298 JVMWrapper("JVM_GetNanoTimeAdjustment");
299 jlong seconds;
300 jlong nanos;
301
302 os::javaTimeSystemUTC(seconds, nanos);
303
304 // We're going to verify that the result can fit in a long.
305 // For that we need the difference in seconds between 'seconds'
306 // and 'offset_secs' to be such that:
307 // |seconds - offset_secs| < (2^63/10^9)
308 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
309 // which makes |seconds - offset_secs| < 2^33
310 // and we will prefer +/- 2^32 as the maximum acceptable diff
311 // as 2^32 has a more natural feel than 2^33...
312 //
313 // So if |seconds - offset_secs| >= 2^32 - we return a special
314 // sentinel value (-1) which the caller should take as an
315 // exception value indicating that the offset given to us is
316 // too far from range of the current time - leading to too big
317 // a nano adjustment. The caller is expected to recover by
318 // computing a more accurate offset and calling this method
319 // again. (For the record 2^32 secs is ~136 years, so that
320 // should rarely happen)
321 //
322 jlong diff = seconds - offset_secs;
323 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
324 return -1; // sentinel value: the offset is too far off the target
325 }
326
327 // return the adjustment. If you compute a time by adding
328 // this number of nanoseconds along with the number of seconds
329 // in the offset you should get the current UTC time.
330 return (diff * (jlong)1000000000) + nanos;
331 JVM_END
332
333 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
334 jobject dst, jint dst_pos, jint length))
335 JVMWrapper("JVM_ArrayCopy");
336 // Check if we have null pointers
337 if (src == NULL || dst == NULL) {
338 THROW(vmSymbols::java_lang_NullPointerException());
339 }
340 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
341 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
342 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
343 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
344 // Do copy
345 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
346 JVM_END
347
348
349 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
350 JavaValue r(T_OBJECT);
351 // public synchronized Object put(Object key, Object value);
352 HandleMark hm(THREAD);
353 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
354 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
355 JavaCalls::call_virtual(&r,
356 props,
357 SystemDictionary::Properties_klass(),
358 vmSymbols::put_name(),
359 vmSymbols::object_object_object_signature(),
360 key_str,
361 value_str,
362 THREAD);
363 }
364
365
366 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
367
368 /*
369 * Return all of the system properties in a Java String array with alternating
370 * names and values from the jvm SystemProperty.
371 * Which includes some internal and all commandline -D defined properties.
372 */
373 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
374 JVMWrapper("JVM_GetProperties");
375 ResourceMark rm(THREAD);
376 HandleMark hm(THREAD);
377 int ndx = 0;
378 int fixedCount = 2;
379
380 SystemProperty* p = Arguments::system_properties();
381 int count = Arguments::PropertyList_count(p);
382
383 // Allocate result String array
384 InstanceKlass* ik = SystemDictionary::String_klass();
385 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
386 objArrayHandle result_h(THREAD, r);
387
388 while (p != NULL) {
389 const char * key = p->key();
390 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
391 const char * value = p->value();
392 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
393 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
394 result_h->obj_at_put(ndx * 2, key_str());
395 result_h->obj_at_put(ndx * 2 + 1, value_str());
396 ndx++;
397 }
398 p = p->next();
399 }
400
401 // Convert the -XX:MaxDirectMemorySize= command line flag
402 // to the sun.nio.MaxDirectMemorySize property.
403 // Do this after setting user properties to prevent people
404 // from setting the value with a -D option, as requested.
405 // Leave empty if not supplied
406 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
407 char as_chars[256];
408 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
409 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
410 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
411 result_h->obj_at_put(ndx * 2, key_str());
412 result_h->obj_at_put(ndx * 2 + 1, value_str());
413 ndx++;
414 }
415
416 // JVM monitoring and management support
417 // Add the sun.management.compiler property for the compiler's name
418 {
419 #undef CSIZE
420 #if defined(_LP64) || defined(_WIN64)
421 #define CSIZE "64-Bit "
422 #else
423 #define CSIZE
424 #endif // 64bit
425
426 #ifdef TIERED
427 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
428 #else
429 #if defined(COMPILER1)
430 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
431 #elif defined(COMPILER2)
432 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
433 #elif INCLUDE_JVMCI
434 #error "INCLUDE_JVMCI should imply TIERED"
435 #else
436 const char* compiler_name = "";
437 #endif // compilers
438 #endif // TIERED
439
440 if (*compiler_name != '\0' &&
441 (Arguments::mode() != Arguments::_int)) {
442 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
443 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
444 result_h->obj_at_put(ndx * 2, key_str());
445 result_h->obj_at_put(ndx * 2 + 1, value_str());
446 ndx++;
447 }
448 }
449
450 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
451 JVM_END
452
453
454 /*
455 * Return the temporary directory that the VM uses for the attach
456 * and perf data files.
457 *
458 * It is important that this directory is well-known and the
459 * same for all VM instances. It cannot be affected by configuration
460 * variables such as java.io.tmpdir.
461 */
462 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
463 JVMWrapper("JVM_GetTemporaryDirectory");
464 HandleMark hm(THREAD);
465 const char* temp_dir = os::get_temp_directory();
466 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
467 return (jstring) JNIHandles::make_local(THREAD, h());
468 JVM_END
469
470
471 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
472
473 extern volatile jint vm_created;
474
475 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
476 JVMWrapper("JVM_BeforeHalt");
477 // Link all classes for dynamic CDS dumping before vm exit.
478 if (DynamicDumpSharedSpaces) {
479 MetaspaceShared::link_and_cleanup_shared_classes(THREAD);
480 }
481 EventShutdown event;
482 if (event.should_commit()) {
483 event.set_reason("Shutdown requested from Java");
484 event.commit();
485 }
486 JVM_END
487
488
489 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
490 before_exit(thread);
491 vm_exit(code);
492 JVM_END
493
494
495 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
496 JVMWrapper("JVM_GC");
497 if (!DisableExplicitGC) {
498 Universe::heap()->collect(GCCause::_java_lang_system_gc);
499 }
500 JVM_END
501
502
503 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
504 JVMWrapper("JVM_MaxObjectInspectionAge");
505 return Universe::heap()->millis_since_last_gc();
506 JVM_END
507
508
509 static inline jlong convert_size_t_to_jlong(size_t val) {
510 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
511 NOT_LP64 (return (jlong)val;)
512 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
513 }
514
515 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
516 JVMWrapper("JVM_TotalMemory");
517 size_t n = Universe::heap()->capacity();
518 return convert_size_t_to_jlong(n);
519 JVM_END
520
521
522 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
523 JVMWrapper("JVM_FreeMemory");
524 size_t n = Universe::heap()->unused();
525 return convert_size_t_to_jlong(n);
526 JVM_END
527
528
529 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
530 JVMWrapper("JVM_MaxMemory");
531 size_t n = Universe::heap()->max_capacity();
532 return convert_size_t_to_jlong(n);
533 JVM_END
534
535
536 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
537 JVMWrapper("JVM_ActiveProcessorCount");
538 return os::active_processor_count();
539 JVM_END
540
541
542
543 // java.lang.Throwable //////////////////////////////////////////////////////
544
545 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
546 JVMWrapper("JVM_FillInStackTrace");
547 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
548 java_lang_Throwable::fill_in_stack_trace(exception);
549 JVM_END
550
551 // java.lang.NullPointerException ///////////////////////////////////////////
552
553 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
554 if (!ShowCodeDetailsInExceptionMessages) return NULL;
555
556 oop exc = JNIHandles::resolve_non_null(throwable);
557
558 Method* method;
559 int bci;
560 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
561 return NULL;
562 }
563 if (method->is_native()) {
564 return NULL;
565 }
566
567 stringStream ss;
568 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
569 if (ok) {
570 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
571 return (jstring) JNIHandles::make_local(THREAD, result);
572 } else {
573 return NULL;
574 }
575 JVM_END
576
577 // java.lang.StackTraceElement //////////////////////////////////////////////
578
579
580 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
581 JVMWrapper("JVM_InitStackTraceElementArray");
582 Handle exception(THREAD, JNIHandles::resolve(throwable));
583 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
584 objArrayHandle stack_trace(THREAD, st);
585 // Fill in the allocated stack trace
586 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
587 JVM_END
588
589
590 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
591 JVMWrapper("JVM_InitStackTraceElement");
592 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
593 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
594 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
595 JVM_END
596
597
598 // java.lang.StackWalker //////////////////////////////////////////////////////
599
600
601 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
602 jint skip_frames, jint frame_count, jint start_index,
603 jobjectArray frames))
604 JVMWrapper("JVM_CallStackWalk");
605 JavaThread* jt = (JavaThread*) THREAD;
606 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
607 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
608 }
609
610 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
611
612 // frames array is a Class<?>[] array when only getting caller reference,
613 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
614 // be null.
615 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
616 objArrayHandle frames_array_h(THREAD, fa);
617
618 int limit = start_index + frame_count;
619 if (frames_array_h->length() < limit) {
620 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
621 }
622
623 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
624 start_index, frames_array_h, CHECK_NULL);
625 return JNIHandles::make_local(THREAD, result);
626 JVM_END
627
628
629 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
630 jint frame_count, jint start_index,
631 jobjectArray frames))
632 JVMWrapper("JVM_MoreStackWalk");
633
634 // frames array is a Class<?>[] array when only getting caller reference,
635 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
636 // be null.
637 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
638 objArrayHandle frames_array_h(THREAD, fa);
639
640 int limit = start_index+frame_count;
641 if (frames_array_h->length() < limit) {
642 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
643 }
644
645 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
646 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
647 start_index, frames_array_h, THREAD);
648 JVM_END
649
650 // java.lang.Object ///////////////////////////////////////////////
651
652
653 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
654 JVMWrapper("JVM_IHashCode");
655 // as implemented in the classic virtual machine; return 0 if object is NULL
656 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
657 JVM_END
658
659
660 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
661 JVMWrapper("JVM_MonitorWait");
662 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
663 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
664 if (JvmtiExport::should_post_monitor_wait()) {
665 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
666
667 // The current thread already owns the monitor and it has not yet
668 // been added to the wait queue so the current thread cannot be
669 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
670 // event handler cannot accidentally consume an unpark() meant for
671 // the ParkEvent associated with this ObjectMonitor.
672 }
673 ObjectSynchronizer::wait(obj, ms, CHECK);
674 JVM_END
675
676
677 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
678 JVMWrapper("JVM_MonitorNotify");
679 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
680 ObjectSynchronizer::notify(obj, CHECK);
681 JVM_END
682
683
684 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
685 JVMWrapper("JVM_MonitorNotifyAll");
686 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
687 ObjectSynchronizer::notifyall(obj, CHECK);
688 JVM_END
689
690
691 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
692 JVMWrapper("JVM_Clone");
693 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
694 Klass* klass = obj->klass();
695 JvmtiVMObjectAllocEventCollector oam;
696
697 #ifdef ASSERT
698 // Just checking that the cloneable flag is set correct
699 if (obj->is_array()) {
700 guarantee(klass->is_cloneable(), "all arrays are cloneable");
701 } else {
702 guarantee(obj->is_instance(), "should be instanceOop");
703 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
704 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
705 }
706 #endif
707
708 // Check if class of obj supports the Cloneable interface.
709 // All arrays are considered to be cloneable (See JLS 20.1.5).
710 // All j.l.r.Reference classes are considered non-cloneable.
711 if (!klass->is_cloneable() ||
712 (klass->is_instance_klass() &&
713 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
714 ResourceMark rm(THREAD);
715 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
716 }
717
718 // Make shallow object copy
719 const int size = obj->size();
720 oop new_obj_oop = NULL;
721 if (obj->is_array()) {
722 const int length = ((arrayOop)obj())->length();
723 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
724 /* do_zero */ true, CHECK_NULL);
725 } else {
726 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
727 }
728
729 HeapAccess<>::clone(obj(), new_obj_oop, size);
730
731 Handle new_obj(THREAD, new_obj_oop);
732 // Caution: this involves a java upcall, so the clone should be
733 // "gc-robust" by this stage.
734 if (klass->has_finalizer()) {
735 assert(obj->is_instance(), "should be instanceOop");
736 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
737 new_obj = Handle(THREAD, new_obj_oop);
738 }
739
740 return JNIHandles::make_local(THREAD, new_obj());
741 JVM_END
742
743 // java.io.File ///////////////////////////////////////////////////////////////
744
745 JVM_LEAF(char*, JVM_NativePath(char* path))
746 JVMWrapper("JVM_NativePath");
747 return os::native_path(path);
748 JVM_END
749
750
751 // Misc. class handling ///////////////////////////////////////////////////////////
752
753
754 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
755 JVMWrapper("JVM_GetCallerClass");
756
757 // Getting the class of the caller frame.
758 //
759 // The call stack at this point looks something like this:
760 //
761 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
762 // [1] [ @CallerSensitive API.method ]
763 // [.] [ (skipped intermediate frames) ]
764 // [n] [ caller ]
765 vframeStream vfst(thread);
766 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
767 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
768 Method* m = vfst.method();
769 assert(m != NULL, "sanity");
770 switch (n) {
771 case 0:
772 // This must only be called from Reflection.getCallerClass
773 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
774 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
775 }
776 // fall-through
777 case 1:
778 // Frame 0 and 1 must be caller sensitive.
779 if (!m->caller_sensitive()) {
780 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
781 }
782 break;
783 default:
784 if (!m->is_ignored_by_security_stack_walk()) {
785 // We have reached the desired frame; return the holder class.
786 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
787 }
788 break;
789 }
790 }
791 return NULL;
792 JVM_END
793
794
795 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
796 JVMWrapper("JVM_FindPrimitiveClass");
797 oop mirror = NULL;
798 BasicType t = name2type(utf);
799 if (t != T_ILLEGAL && !is_reference_type(t)) {
800 mirror = Universe::java_mirror(t);
801 }
802 if (mirror == NULL) {
803 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
804 } else {
805 return (jclass) JNIHandles::make_local(THREAD, mirror);
806 }
807 JVM_END
808
809
810 // Returns a class loaded by the bootstrap class loader; or null
811 // if not found. ClassNotFoundException is not thrown.
812 // FindClassFromBootLoader is exported to the launcher for windows.
813 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
814 const char* name))
815 JVMWrapper("JVM_FindClassFromBootLoader");
816
817 // Java libraries should ensure that name is never null or illegal.
818 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
819 // It's impossible to create this class; the name cannot fit
820 // into the constant pool.
821 return NULL;
822 }
823 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
824
825 TempNewSymbol h_name = SymbolTable::new_symbol(name);
826 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
827 if (k == NULL) {
828 return NULL;
829 }
830
831 if (log_is_enabled(Debug, class, resolve)) {
832 trace_class_resolution(k);
833 }
834 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
835 JVM_END
836
837 // Find a class with this name in this loader, using the caller's protection domain.
838 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
839 jboolean init, jobject loader,
840 jclass caller))
841 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
842
843 TempNewSymbol h_name =
844 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
845 CHECK_NULL);
846
847 oop loader_oop = JNIHandles::resolve(loader);
848 oop from_class = JNIHandles::resolve(caller);
849 oop protection_domain = NULL;
850 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
851 // NPE. Put it in another way, the bootstrap class loader has all permission and
852 // thus no checkPackageAccess equivalence in the VM class loader.
853 // The caller is also passed as NULL by the java code if there is no security
854 // manager to avoid the performance cost of getting the calling class.
855 if (from_class != NULL && loader_oop != NULL) {
856 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
857 }
858
859 Handle h_loader(THREAD, loader_oop);
860 Handle h_prot(THREAD, protection_domain);
861 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
862 h_prot, false, THREAD);
863
864 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
865 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
866 }
867 return result;
868 JVM_END
869
870 // Currently only called from the old verifier.
871 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
872 jboolean init, jclass from))
873 JVMWrapper("JVM_FindClassFromClass");
874 TempNewSymbol h_name =
875 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
876 CHECK_NULL);
877 oop from_class_oop = JNIHandles::resolve(from);
878 Klass* from_class = (from_class_oop == NULL)
879 ? (Klass*)NULL
880 : java_lang_Class::as_Klass(from_class_oop);
881 oop class_loader = NULL;
882 oop protection_domain = NULL;
883 if (from_class != NULL) {
884 class_loader = from_class->class_loader();
885 protection_domain = from_class->protection_domain();
886 }
887 Handle h_loader(THREAD, class_loader);
888 Handle h_prot (THREAD, protection_domain);
889 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
890 h_prot, true, thread);
891
892 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
893 // this function is generally only used for class loading during verification.
894 ResourceMark rm;
895 oop from_mirror = JNIHandles::resolve_non_null(from);
896 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
897 const char * from_name = from_class->external_name();
898
899 oop mirror = JNIHandles::resolve_non_null(result);
900 Klass* to_class = java_lang_Class::as_Klass(mirror);
901 const char * to = to_class->external_name();
902 log_debug(class, resolve)("%s %s (verification)", from_name, to);
903 }
904
905 return result;
906 JVM_END
907
908 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
909 if (loader.is_null()) {
910 return;
911 }
912
913 // check whether the current caller thread holds the lock or not.
914 // If not, increment the corresponding counter
915 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
916 ObjectSynchronizer::owner_self) {
917 counter->inc();
918 }
919 }
920
921 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
922 static jclass jvm_define_class_common(const char *name,
923 jobject loader, const jbyte *buf,
924 jsize len, jobject pd, const char *source,
925 TRAPS) {
926 if (source == NULL) source = "__JVM_DefineClass__";
927
928 assert(THREAD->is_Java_thread(), "must be a JavaThread");
929 JavaThread* jt = (JavaThread*) THREAD;
930
931 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
932 ClassLoader::perf_define_appclass_selftime(),
933 ClassLoader::perf_define_appclasses(),
934 jt->get_thread_stat()->perf_recursion_counts_addr(),
935 jt->get_thread_stat()->perf_timers_addr(),
936 PerfClassTraceTime::DEFINE_CLASS);
937
938 if (UsePerfData) {
939 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
940 }
941
942 // Class resolution will get the class name from the .class stream if the name is null.
943 TempNewSymbol class_name = name == NULL ? NULL :
944 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
945 CHECK_NULL);
946
947 ResourceMark rm(THREAD);
948 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
949 Handle class_loader (THREAD, JNIHandles::resolve(loader));
950 if (UsePerfData) {
951 is_lock_held_by_thread(class_loader,
952 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
953 THREAD);
954 }
955 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
956 Klass* k = SystemDictionary::resolve_from_stream(class_name,
957 class_loader,
958 protection_domain,
959 &st,
960 CHECK_NULL);
961
962 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
963 trace_class_resolution(k);
964 }
965
966 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
967 }
968
969 enum {
970 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
971 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
972 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
973 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
974 };
975
976 /*
977 * Define a class with the specified flags that indicates if it's a nestmate,
978 * hidden, or strongly referenced from class loader.
979 */
980 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
981 const jbyte *buf, jsize len, jobject pd,
982 jboolean init, int flags, jobject classData, TRAPS) {
983 assert(THREAD->is_Java_thread(), "must be a JavaThread");
984 ResourceMark rm(THREAD);
985
986 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
987 // Lookup class must be a non-null instance
988 if (lookup_k == NULL) {
989 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
990 }
991 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
992
993 Handle class_loader (THREAD, lookup_k->class_loader());
994
995 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
996 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
997 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
998 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
999
1000 InstanceKlass* host_class = NULL;
1001 if (is_nestmate) {
1002 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1003 }
1004
1005 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1006 name,
1007 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1008 is_nestmate ? host_class->external_name() : "",
1009 is_hidden ? "hidden" : "not hidden",
1010 is_strong ? "strong" : "weak",
1011 vm_annotations ? "with vm annotations" : "without vm annotation");
1012
1013 if (!is_hidden) {
1014 // classData is only applicable for hidden classes
1015 if (classData != NULL) {
1016 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1017 }
1018 if (is_nestmate) {
1019 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1020 }
1021 if (!is_strong) {
1022 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1023 }
1024 if (vm_annotations) {
1025 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1026 }
1027 if (flags != STRONG_LOADER_LINK) {
1028 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1029 err_msg("invalid flag 0x%x", flags));
1030 }
1031 }
1032
1033 // Class resolution will get the class name from the .class stream if the name is null.
1034 TempNewSymbol class_name = name == NULL ? NULL :
1035 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1036 CHECK_NULL);
1037
1038 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1039 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1040 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1041
1042 Klass* defined_k;
1043 InstanceKlass* ik = NULL;
1044 if (!is_hidden) {
1045 defined_k = SystemDictionary::resolve_from_stream(class_name,
1046 class_loader,
1047 protection_domain,
1048 &st,
1049 CHECK_NULL);
1050
1051 if (log_is_enabled(Debug, class, resolve) && defined_k != NULL) {
1052 trace_class_resolution(defined_k);
1053 }
1054 ik = InstanceKlass::cast(defined_k);
1055 } else { // hidden
1056 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1057 ClassLoadInfo cl_info(protection_domain,
1058 NULL, // unsafe_anonymous_host
1059 NULL, // cp_patches
1060 host_class,
1061 classData_h,
1062 is_hidden,
1063 is_strong,
1064 vm_annotations);
1065 defined_k = SystemDictionary::parse_stream(class_name,
1066 class_loader,
1067 &st,
1068 cl_info,
1069 CHECK_NULL);
1070 if (defined_k == NULL) {
1071 THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a hidden class");
1072 }
1073
1074 ik = InstanceKlass::cast(defined_k);
1075
1076 // The hidden class loader data has been artificially been kept alive to
1077 // this point. The mirror and any instances of this class have to keep
1078 // it alive afterwards.
1079 ik->class_loader_data()->dec_keep_alive();
1080
1081 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1082 ModuleEntry* module = ik->module();
1083 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1084 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1085 module_name,
1086 ik->external_name(),
1087 host_class->external_name(),
1088 ik->is_hidden() ? "is hidden" : "is not hidden");
1089 }
1090 }
1091 assert(Reflection::is_same_class_package(lookup_k, defined_k),
1092 "lookup class and defined class are in different packages");
1093
1094 if (init) {
1095 ik->initialize(CHECK_NULL);
1096 } else {
1097 ik->link_class(CHECK_NULL);
1098 }
1099
1100 return (jclass) JNIHandles::make_local(THREAD, defined_k->java_mirror());
1101 }
1102
1103 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1104 JVMWrapper("JVM_DefineClass");
1105
1106 return jvm_define_class_common(name, loader, buf, len, pd, NULL, THREAD);
1107 JVM_END
1108
1109 /*
1110 * Define a class with the specified lookup class.
1111 * lookup: Lookup class
1112 * name: the name of the class
1113 * buf: class bytes
1114 * len: length of class bytes
1115 * pd: protection domain
1116 * init: initialize the class
1117 * flags: properties of the class
1118 * classData: private static pre-initialized field
1119 */
1120 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1121 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1122 JVMWrapper("JVM_LookupDefineClass");
1123
1124 if (lookup == NULL) {
1125 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1126 }
1127
1128 assert(buf != NULL, "buf must not be NULL");
1129
1130 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1131 JVM_END
1132
1133 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1134 JVMWrapper("JVM_DefineClassWithSource");
1135
1136 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1137 JVM_END
1138
1139 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1140 JVMWrapper("JVM_FindLoadedClass");
1141 ResourceMark rm(THREAD);
1142
1143 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1144 char* str = java_lang_String::as_utf8_string(h_name());
1145
1146 // Sanity check, don't expect null
1147 if (str == NULL) return NULL;
1148
1149 // Internalize the string, converting '.' to '/' in string.
1150 char* p = (char*)str;
1151 while (*p != '\0') {
1152 if (*p == '.') {
1153 *p = '/';
1154 }
1155 p++;
1156 }
1157
1158 const int str_len = (int)(p - str);
1159 if (str_len > Symbol::max_length()) {
1160 // It's impossible to create this class; the name cannot fit
1161 // into the constant pool.
1162 return NULL;
1163 }
1164 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1165
1166 // Security Note:
1167 // The Java level wrapper will perform the necessary security check allowing
1168 // us to pass the NULL as the initiating class loader.
1169 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1170 if (UsePerfData) {
1171 is_lock_held_by_thread(h_loader,
1172 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1173 THREAD);
1174 }
1175
1176 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1177 h_loader,
1178 Handle(),
1179 CHECK_NULL);
1180 #if INCLUDE_CDS
1181 if (k == NULL) {
1182 // If the class is not already loaded, try to see if it's in the shared
1183 // archive for the current classloader (h_loader).
1184 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1185 }
1186 #endif
1187 return (k == NULL) ? NULL :
1188 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1189 JVM_END
1190
1191 // Module support //////////////////////////////////////////////////////////////////////////////
1192
1193 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1194 jstring location, jobjectArray packages))
1195 JVMWrapper("JVM_DefineModule");
1196 Modules::define_module(module, is_open, version, location, packages, CHECK);
1197 JVM_END
1198
1199 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1200 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1201 Modules::set_bootloader_unnamed_module(module, CHECK);
1202 JVM_END
1203
1204 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1205 JVMWrapper("JVM_AddModuleExports");
1206 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1207 JVM_END
1208
1209 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1210 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1211 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1212 JVM_END
1213
1214 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1215 JVMWrapper("JVM_AddModuleExportsToAll");
1216 Modules::add_module_exports(from_module, package, NULL, CHECK);
1217 JVM_END
1218
1219 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1220 JVMWrapper("JVM_AddReadsModule");
1221 Modules::add_reads_module(from_module, source_module, CHECK);
1222 JVM_END
1223
1224 // Reflection support //////////////////////////////////////////////////////////////////////////////
1225
1226 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1227 assert (cls != NULL, "illegal class");
1228 JVMWrapper("JVM_InitClassName");
1229 JvmtiVMObjectAllocEventCollector oam;
1230 ResourceMark rm(THREAD);
1231 HandleMark hm(THREAD);
1232 Handle java_class(THREAD, JNIHandles::resolve(cls));
1233 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1234 return (jstring) JNIHandles::make_local(THREAD, result);
1235 JVM_END
1236
1237
1238 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1239 JVMWrapper("JVM_GetClassInterfaces");
1240 JvmtiVMObjectAllocEventCollector oam;
1241 oop mirror = JNIHandles::resolve_non_null(cls);
1242
1243 // Special handling for primitive objects
1244 if (java_lang_Class::is_primitive(mirror)) {
1245 // Primitive objects does not have any interfaces
1246 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1247 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1248 }
1249
1250 Klass* klass = java_lang_Class::as_Klass(mirror);
1251 // Figure size of result array
1252 int size;
1253 if (klass->is_instance_klass()) {
1254 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1255 } else {
1256 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1257 size = 2;
1258 }
1259
1260 // Allocate result array
1261 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1262 objArrayHandle result (THREAD, r);
1263 // Fill in result
1264 if (klass->is_instance_klass()) {
1265 // Regular instance klass, fill in all local interfaces
1266 for (int index = 0; index < size; index++) {
1267 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1268 result->obj_at_put(index, k->java_mirror());
1269 }
1270 } else {
1271 // All arrays implement java.lang.Cloneable and java.io.Serializable
1272 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1273 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1274 }
1275 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1276 JVM_END
1277
1278
1279 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1280 JVMWrapper("JVM_IsInterface");
1281 oop mirror = JNIHandles::resolve_non_null(cls);
1282 if (java_lang_Class::is_primitive(mirror)) {
1283 return JNI_FALSE;
1284 }
1285 Klass* k = java_lang_Class::as_Klass(mirror);
1286 jboolean result = k->is_interface();
1287 assert(!result || k->is_instance_klass(),
1288 "all interfaces are instance types");
1289 // The compiler intrinsic for isInterface tests the
1290 // Klass::_access_flags bits in the same way.
1291 return result;
1292 JVM_END
1293
1294 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1295 JVMWrapper("JVM_IsHiddenClass");
1296 oop mirror = JNIHandles::resolve_non_null(cls);
1297 if (java_lang_Class::is_primitive(mirror)) {
1298 return JNI_FALSE;
1299 }
1300 Klass* k = java_lang_Class::as_Klass(mirror);
1301 return k->is_hidden();
1302 JVM_END
1303
1304 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1305 JVMWrapper("JVM_GetClassSigners");
1306 JvmtiVMObjectAllocEventCollector oam;
1307 oop mirror = JNIHandles::resolve_non_null(cls);
1308 if (java_lang_Class::is_primitive(mirror)) {
1309 // There are no signers for primitive types
1310 return NULL;
1311 }
1312
1313 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1314
1315 // If there are no signers set in the class, or if the class
1316 // is an array, return NULL.
1317 if (signers == NULL) return NULL;
1318
1319 // copy of the signers array
1320 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1321 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1322 for (int index = 0; index < signers->length(); index++) {
1323 signers_copy->obj_at_put(index, signers->obj_at(index));
1324 }
1325
1326 // return the copy
1327 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1328 JVM_END
1329
1330
1331 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1332 JVMWrapper("JVM_SetClassSigners");
1333 oop mirror = JNIHandles::resolve_non_null(cls);
1334 if (!java_lang_Class::is_primitive(mirror)) {
1335 // This call is ignored for primitive types and arrays.
1336 // Signers are only set once, ClassLoader.java, and thus shouldn't
1337 // be called with an array. Only the bootstrap loader creates arrays.
1338 Klass* k = java_lang_Class::as_Klass(mirror);
1339 if (k->is_instance_klass()) {
1340 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1341 }
1342 }
1343 JVM_END
1344
1345
1346 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1347 JVMWrapper("JVM_GetProtectionDomain");
1348 oop mirror = JNIHandles::resolve_non_null(cls);
1349 if (mirror == NULL) {
1350 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1351 }
1352
1353 if (java_lang_Class::is_primitive(mirror)) {
1354 // Primitive types does not have a protection domain.
1355 return NULL;
1356 }
1357
1358 oop pd = java_lang_Class::protection_domain(mirror);
1359 return (jobject) JNIHandles::make_local(THREAD, 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(THREAD, 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(THREAD, 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(THREAD, 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 oop mirror = JNIHandles::resolve_non_null(cls);
1481 if (java_lang_Class::is_primitive(mirror)) {
1482 // Primitive type
1483 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1484 }
1485
1486 Klass* k = java_lang_Class::as_Klass(mirror);
1487 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1488 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1489 return k->modifier_flags();
1490 JVM_END
1491
1492
1493 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1494
1495 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1496 JvmtiVMObjectAllocEventCollector oam;
1497 // ofClass is a reference to a java_lang_Class object. The mirror object
1498 // of an InstanceKlass
1499 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1500 if (java_lang_Class::is_primitive(ofMirror) ||
1501 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1502 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1503 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1504 }
1505
1506 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1507 InnerClassesIterator iter(k);
1508
1509 if (iter.length() == 0) {
1510 // Neither an inner nor outer class
1511 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1512 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1513 }
1514
1515 // find inner class info
1516 constantPoolHandle cp(thread, k->constants());
1517 int length = iter.length();
1518
1519 // Allocate temp. result array
1520 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1521 objArrayHandle result (THREAD, r);
1522 int members = 0;
1523
1524 for (; !iter.done(); iter.next()) {
1525 int ioff = iter.inner_class_info_index();
1526 int ooff = iter.outer_class_info_index();
1527
1528 if (ioff != 0 && ooff != 0) {
1529 // Check to see if the name matches the class we're looking for
1530 // before attempting to find the class.
1531 if (cp->klass_name_at_matches(k, ooff)) {
1532 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1533 if (outer_klass == k) {
1534 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1535 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1536
1537 // Throws an exception if outer klass has not declared k as
1538 // an inner klass
1539 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1540
1541 result->obj_at_put(members, inner_klass->java_mirror());
1542 members++;
1543 }
1544 }
1545 }
1546 }
1547
1548 if (members != length) {
1549 // Return array of right length
1550 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1551 for(int i = 0; i < members; i++) {
1552 res->obj_at_put(i, result->obj_at(i));
1553 }
1554 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1555 }
1556
1557 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1558 JVM_END
1559
1560
1561 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1562 {
1563 // ofClass is a reference to a java_lang_Class object.
1564 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1565 if (java_lang_Class::is_primitive(ofMirror)) {
1566 return NULL;
1567 }
1568 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1569 if (!klass->is_instance_klass()) {
1570 return NULL;
1571 }
1572
1573 bool inner_is_member = false;
1574 Klass* outer_klass
1575 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1576 if (outer_klass == NULL) return NULL; // already a top-level class
1577 if (!inner_is_member) return NULL; // a hidden or unsafe anonymous class (inside a method)
1578 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1579 }
1580 JVM_END
1581
1582 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1583 {
1584 oop mirror = JNIHandles::resolve_non_null(cls);
1585 if (java_lang_Class::is_primitive(mirror)) {
1586 return NULL;
1587 }
1588 Klass* klass = java_lang_Class::as_Klass(mirror);
1589 if (!klass->is_instance_klass()) {
1590 return NULL;
1591 }
1592 InstanceKlass* k = InstanceKlass::cast(klass);
1593 int ooff = 0, noff = 0;
1594 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1595 if (noff != 0) {
1596 constantPoolHandle i_cp(thread, k->constants());
1597 Symbol* name = i_cp->symbol_at(noff);
1598 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1599 return (jstring) JNIHandles::make_local(THREAD, str());
1600 }
1601 }
1602 return NULL;
1603 }
1604 JVM_END
1605
1606 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1607 assert (cls != NULL, "illegal class");
1608 JVMWrapper("JVM_GetClassSignature");
1609 JvmtiVMObjectAllocEventCollector oam;
1610 ResourceMark rm(THREAD);
1611 oop mirror = JNIHandles::resolve_non_null(cls);
1612 // Return null for arrays and primatives
1613 if (!java_lang_Class::is_primitive(mirror)) {
1614 Klass* k = java_lang_Class::as_Klass(mirror);
1615 if (k->is_instance_klass()) {
1616 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1617 if (sym == NULL) return NULL;
1618 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1619 return (jstring) JNIHandles::make_local(THREAD, str());
1620 }
1621 }
1622 return NULL;
1623 JVM_END
1624
1625
1626 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1627 assert (cls != NULL, "illegal class");
1628 JVMWrapper("JVM_GetClassAnnotations");
1629 oop mirror = JNIHandles::resolve_non_null(cls);
1630 // Return null for arrays and primitives
1631 if (!java_lang_Class::is_primitive(mirror)) {
1632 Klass* k = java_lang_Class::as_Klass(mirror);
1633 if (k->is_instance_klass()) {
1634 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1635 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1636 }
1637 }
1638 return NULL;
1639 JVM_END
1640
1641
1642 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1643 // some of this code was adapted from from jni_FromReflectedField
1644
1645 oop reflected = JNIHandles::resolve_non_null(field);
1646 oop mirror = java_lang_reflect_Field::clazz(reflected);
1647 Klass* k = java_lang_Class::as_Klass(mirror);
1648 int slot = java_lang_reflect_Field::slot(reflected);
1649 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1650
1651 InstanceKlass* ik = InstanceKlass::cast(k);
1652 intptr_t offset = ik->field_offset(slot);
1653
1654 if (modifiers & JVM_ACC_STATIC) {
1655 // for static fields we only look in the current class
1656 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1657 assert(false, "cannot find static field");
1658 return false;
1659 }
1660 } else {
1661 // for instance fields we start with the current class and work
1662 // our way up through the superclass chain
1663 if (!ik->find_field_from_offset(offset, false, &fd)) {
1664 assert(false, "cannot find instance field");
1665 return false;
1666 }
1667 }
1668 return true;
1669 }
1670
1671 static Method* jvm_get_method_common(jobject method) {
1672 // some of this code was adapted from from jni_FromReflectedMethod
1673
1674 oop reflected = JNIHandles::resolve_non_null(method);
1675 oop mirror = NULL;
1676 int slot = 0;
1677
1678 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1679 mirror = java_lang_reflect_Constructor::clazz(reflected);
1680 slot = java_lang_reflect_Constructor::slot(reflected);
1681 } else {
1682 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1683 "wrong type");
1684 mirror = java_lang_reflect_Method::clazz(reflected);
1685 slot = java_lang_reflect_Method::slot(reflected);
1686 }
1687 Klass* k = java_lang_Class::as_Klass(mirror);
1688
1689 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1690 assert(m != NULL, "cannot find method");
1691 return m; // caller has to deal with NULL in product mode
1692 }
1693
1694 /* Type use annotations support (JDK 1.8) */
1695
1696 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1697 assert (cls != NULL, "illegal class");
1698 JVMWrapper("JVM_GetClassTypeAnnotations");
1699 ResourceMark rm(THREAD);
1700 // Return null for arrays and primitives
1701 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1702 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1703 if (k->is_instance_klass()) {
1704 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1705 if (type_annotations != NULL) {
1706 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1707 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1708 }
1709 }
1710 }
1711 return NULL;
1712 JVM_END
1713
1714 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1715 assert (method != NULL, "illegal method");
1716 JVMWrapper("JVM_GetMethodTypeAnnotations");
1717
1718 // method is a handle to a java.lang.reflect.Method object
1719 Method* m = jvm_get_method_common(method);
1720 if (m == NULL) {
1721 return NULL;
1722 }
1723
1724 AnnotationArray* type_annotations = m->type_annotations();
1725 if (type_annotations != NULL) {
1726 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1727 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1728 }
1729
1730 return NULL;
1731 JVM_END
1732
1733 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1734 assert (field != NULL, "illegal field");
1735 JVMWrapper("JVM_GetFieldTypeAnnotations");
1736
1737 fieldDescriptor fd;
1738 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1739 if (!gotFd) {
1740 return NULL;
1741 }
1742
1743 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1744 JVM_END
1745
1746 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1747 if (!cp->is_within_bounds(index)) {
1748 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1749 }
1750 }
1751
1752 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1753 {
1754 JVMWrapper("JVM_GetMethodParameters");
1755 // method is a handle to a java.lang.reflect.Method object
1756 Method* method_ptr = jvm_get_method_common(method);
1757 methodHandle mh (THREAD, method_ptr);
1758 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1759 const int num_params = mh->method_parameters_length();
1760
1761 if (num_params < 0) {
1762 // A -1 return value from method_parameters_length means there is no
1763 // parameter data. Return null to indicate this to the reflection
1764 // API.
1765 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1766 return (jobjectArray)NULL;
1767 } else {
1768 // Otherwise, we return something up to reflection, even if it is
1769 // a zero-length array. Why? Because in some cases this can
1770 // trigger a MalformedParametersException.
1771
1772 // make sure all the symbols are properly formatted
1773 for (int i = 0; i < num_params; i++) {
1774 MethodParametersElement* params = mh->method_parameters_start();
1775 int index = params[i].name_cp_index;
1776 constantPoolHandle cp(THREAD, mh->constants());
1777 bounds_check(cp, index, CHECK_NULL);
1778
1779 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1780 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1781 "Wrong type at constant pool index");
1782 }
1783
1784 }
1785
1786 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1787 objArrayHandle result (THREAD, result_oop);
1788
1789 for (int i = 0; i < num_params; i++) {
1790 MethodParametersElement* params = mh->method_parameters_start();
1791 // For a 0 index, give a NULL symbol
1792 Symbol* sym = 0 != params[i].name_cp_index ?
1793 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1794 int flags = params[i].flags;
1795 oop param = Reflection::new_parameter(reflected_method, i, sym,
1796 flags, CHECK_NULL);
1797 result->obj_at_put(i, param);
1798 }
1799 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1800 }
1801 }
1802 JVM_END
1803
1804 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1805
1806 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1807 {
1808 JVMWrapper("JVM_GetClassDeclaredFields");
1809 JvmtiVMObjectAllocEventCollector oam;
1810
1811 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1812 // Exclude primitive types and array types
1813 if (java_lang_Class::is_primitive(ofMirror) ||
1814 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1815 // Return empty array
1816 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1817 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1818 }
1819
1820 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1821 constantPoolHandle cp(THREAD, k->constants());
1822
1823 // Ensure class is linked
1824 k->link_class(CHECK_NULL);
1825
1826 // Allocate result
1827 int num_fields;
1828
1829 if (publicOnly) {
1830 num_fields = 0;
1831 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1832 if (fs.access_flags().is_public()) ++num_fields;
1833 }
1834 } else {
1835 num_fields = k->java_fields_count();
1836 }
1837
1838 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1839 objArrayHandle result (THREAD, r);
1840
1841 int out_idx = 0;
1842 fieldDescriptor fd;
1843 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1844 if (!publicOnly || fs.access_flags().is_public()) {
1845 fd.reinitialize(k, fs.index());
1846 oop field = Reflection::new_field(&fd, CHECK_NULL);
1847 result->obj_at_put(out_idx, field);
1848 ++out_idx;
1849 }
1850 }
1851 assert(out_idx == num_fields, "just checking");
1852 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1853 }
1854 JVM_END
1855
1856 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1857 {
1858 JVMWrapper("JVM_IsRecord");
1859 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1860 if (k != NULL && k->is_instance_klass()) {
1861 InstanceKlass* ik = InstanceKlass::cast(k);
1862 return ik->is_record();
1863 } else {
1864 return false;
1865 }
1866 }
1867 JVM_END
1868
1869 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1870 {
1871 JVMWrapper("JVM_GetRecordComponents");
1872 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1873 assert(c->is_instance_klass(), "must be");
1874 InstanceKlass* ik = InstanceKlass::cast(c);
1875
1876 if (ik->is_record()) {
1877 Array<RecordComponent*>* components = ik->record_components();
1878 assert(components != NULL, "components should not be NULL");
1879 {
1880 JvmtiVMObjectAllocEventCollector oam;
1881 constantPoolHandle cp(THREAD, ik->constants());
1882 int length = components->length();
1883 assert(length >= 0, "unexpected record_components length");
1884 objArrayOop record_components =
1885 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL);
1886 objArrayHandle components_h (THREAD, record_components);
1887
1888 for (int x = 0; x < length; x++) {
1889 RecordComponent* component = components->at(x);
1890 assert(component != NULL, "unexpected NULL record component");
1891 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1892 components_h->obj_at_put(x, component_oop);
1893 }
1894 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1895 }
1896 }
1897
1898 // Return empty array if ofClass is not a record.
1899 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL);
1900 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1901 }
1902 JVM_END
1903
1904 static bool select_method(const methodHandle& method, bool want_constructor) {
1905 if (want_constructor) {
1906 return (method->is_initializer() && !method->is_static());
1907 } else {
1908 return (!method->is_initializer() && !method->is_overpass());
1909 }
1910 }
1911
1912 static jobjectArray get_class_declared_methods_helper(
1913 JNIEnv *env,
1914 jclass ofClass, jboolean publicOnly,
1915 bool want_constructor,
1916 Klass* klass, TRAPS) {
1917
1918 JvmtiVMObjectAllocEventCollector oam;
1919
1920 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1921 // Exclude primitive types and array types
1922 if (java_lang_Class::is_primitive(ofMirror)
1923 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1924 // Return empty array
1925 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1926 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1927 }
1928
1929 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1930
1931 // Ensure class is linked
1932 k->link_class(CHECK_NULL);
1933
1934 Array<Method*>* methods = k->methods();
1935 int methods_length = methods->length();
1936
1937 // Save original method_idnum in case of redefinition, which can change
1938 // the idnum of obsolete methods. The new method will have the same idnum
1939 // but if we refresh the methods array, the counts will be wrong.
1940 ResourceMark rm(THREAD);
1941 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1942 int num_methods = 0;
1943
1944 for (int i = 0; i < methods_length; i++) {
1945 methodHandle method(THREAD, methods->at(i));
1946 if (select_method(method, want_constructor)) {
1947 if (!publicOnly || method->is_public()) {
1948 idnums->push(method->method_idnum());
1949 ++num_methods;
1950 }
1951 }
1952 }
1953
1954 // Allocate result
1955 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1956 objArrayHandle result (THREAD, r);
1957
1958 // Now just put the methods that we selected above, but go by their idnum
1959 // in case of redefinition. The methods can be redefined at any safepoint,
1960 // so above when allocating the oop array and below when creating reflect
1961 // objects.
1962 for (int i = 0; i < num_methods; i++) {
1963 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1964 if (method.is_null()) {
1965 // Method may have been deleted and seems this API can handle null
1966 // Otherwise should probably put a method that throws NSME
1967 result->obj_at_put(i, NULL);
1968 } else {
1969 oop m;
1970 if (want_constructor) {
1971 m = Reflection::new_constructor(method, CHECK_NULL);
1972 } else {
1973 m = Reflection::new_method(method, false, CHECK_NULL);
1974 }
1975 result->obj_at_put(i, m);
1976 }
1977 }
1978
1979 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1980 }
1981
1982 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1983 {
1984 JVMWrapper("JVM_GetClassDeclaredMethods");
1985 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1986 /*want_constructor*/ false,
1987 SystemDictionary::reflect_Method_klass(), THREAD);
1988 }
1989 JVM_END
1990
1991 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1992 {
1993 JVMWrapper("JVM_GetClassDeclaredConstructors");
1994 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1995 /*want_constructor*/ true,
1996 SystemDictionary::reflect_Constructor_klass(), THREAD);
1997 }
1998 JVM_END
1999
2000 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
2001 {
2002 JVMWrapper("JVM_GetClassAccessFlags");
2003 oop mirror = JNIHandles::resolve_non_null(cls);
2004 if (java_lang_Class::is_primitive(mirror)) {
2005 // Primitive type
2006 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
2007 }
2008
2009 Klass* k = java_lang_Class::as_Klass(mirror);
2010 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
2011 }
2012 JVM_END
2013
2014 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
2015 {
2016 JVMWrapper("JVM_AreNestMates");
2017 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2018 assert(c->is_instance_klass(), "must be");
2019 InstanceKlass* ck = InstanceKlass::cast(c);
2020 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2021 assert(m->is_instance_klass(), "must be");
2022 InstanceKlass* mk = InstanceKlass::cast(m);
2023 return ck->has_nestmate_access_to(mk, THREAD);
2024 }
2025 JVM_END
2026
2027 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2028 {
2029 // current is not a primitive or array class
2030 JVMWrapper("JVM_GetNestHost");
2031 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2032 assert(c->is_instance_klass(), "must be");
2033 InstanceKlass* ck = InstanceKlass::cast(c);
2034 InstanceKlass* host = ck->nest_host(THREAD);
2035 return (jclass) (host == NULL ? NULL :
2036 JNIHandles::make_local(THREAD, host->java_mirror()));
2037 }
2038 JVM_END
2039
2040 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2041 {
2042 // current is not a primitive or array class
2043 JVMWrapper("JVM_GetNestMembers");
2044 ResourceMark rm(THREAD);
2045 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2046 assert(c->is_instance_klass(), "must be");
2047 InstanceKlass* ck = InstanceKlass::cast(c);
2048 InstanceKlass* host = ck->nest_host(THREAD);
2049
2050 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2051 ck->external_name(), host->external_name());
2052 {
2053 JvmtiVMObjectAllocEventCollector oam;
2054 Array<u2>* members = host->nest_members();
2055 int length = members == NULL ? 0 : members->length();
2056
2057 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2058
2059 // nest host is first in the array so make it one bigger
2060 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2061 length + 1, CHECK_NULL);
2062 objArrayHandle result(THREAD, r);
2063 result->obj_at_put(0, host->java_mirror());
2064 if (length != 0) {
2065 int count = 0;
2066 for (int i = 0; i < length; i++) {
2067 int cp_index = members->at(i);
2068 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2069 if (HAS_PENDING_EXCEPTION) {
2070 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) {
2071 return NULL; // propagate VMEs
2072 }
2073 if (log_is_enabled(Trace, class, nestmates)) {
2074 stringStream ss;
2075 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2076 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2077 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2078 log_trace(class, nestmates)("%s", ss.as_string());
2079 }
2080 CLEAR_PENDING_EXCEPTION;
2081 continue;
2082 }
2083 if (k->is_instance_klass()) {
2084 InstanceKlass* ik = InstanceKlass::cast(k);
2085 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2086 if (nest_host_k == host) {
2087 result->obj_at_put(count+1, k->java_mirror());
2088 count++;
2089 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2090 } else {
2091 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2092 ik->external_name(), nest_host_k->external_name());
2093 }
2094 } else {
2095 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2096 k->external_name());
2097 }
2098 }
2099 if (count < length) {
2100 // we had invalid entries so we need to compact the array
2101 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2102 length + 1, count + 1);
2103
2104 objArrayOop r2 = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2105 count + 1, CHECK_NULL);
2106 objArrayHandle result2(THREAD, r2);
2107 for (int i = 0; i < count + 1; i++) {
2108 result2->obj_at_put(i, result->obj_at(i));
2109 }
2110 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2111 }
2112 }
2113 else {
2114 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2115 }
2116 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2117 }
2118 }
2119 JVM_END
2120
2121 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2122 {
2123 JVMWrapper("JVM_GetPermittedSubclasses");
2124 oop mirror = JNIHandles::resolve_non_null(current);
2125 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2126 Klass* c = java_lang_Class::as_Klass(mirror);
2127 assert(c->is_instance_klass(), "must be");
2128 InstanceKlass* ik = InstanceKlass::cast(c);
2129 {
2130 JvmtiVMObjectAllocEventCollector oam;
2131 Array<u2>* subclasses = ik->permitted_subclasses();
2132 int length = subclasses == NULL ? 0 : subclasses->length();
2133 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
2134 length, CHECK_NULL);
2135 objArrayHandle result(THREAD, r);
2136 for (int i = 0; i < length; i++) {
2137 int cp_index = subclasses->at(i);
2138 // This returns <package-name>/<class-name>.
2139 Symbol* klass_name = ik->constants()->klass_name_at(cp_index);
2140 assert(klass_name != NULL, "Unexpected null klass_name");
2141 Handle perm_subtype_h = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2142 result->obj_at_put(i, perm_subtype_h());
2143 }
2144 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2145 }
2146 }
2147 JVM_END
2148
2149 // Constant pool access //////////////////////////////////////////////////////////
2150
2151 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2152 {
2153 JVMWrapper("JVM_GetClassConstantPool");
2154 JvmtiVMObjectAllocEventCollector oam;
2155 oop mirror = JNIHandles::resolve_non_null(cls);
2156 // Return null for primitives and arrays
2157 if (!java_lang_Class::is_primitive(mirror)) {
2158 Klass* k = java_lang_Class::as_Klass(mirror);
2159 if (k->is_instance_klass()) {
2160 InstanceKlass* k_h = InstanceKlass::cast(k);
2161 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2162 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2163 return JNIHandles::make_local(THREAD, jcp());
2164 }
2165 }
2166 return NULL;
2167 }
2168 JVM_END
2169
2170
2171 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2172 {
2173 JVMWrapper("JVM_ConstantPoolGetSize");
2174 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2175 return cp->length();
2176 }
2177 JVM_END
2178
2179
2180 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2181 {
2182 JVMWrapper("JVM_ConstantPoolGetClassAt");
2183 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2184 bounds_check(cp, index, CHECK_NULL);
2185 constantTag tag = cp->tag_at(index);
2186 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2187 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2188 }
2189 Klass* k = cp->klass_at(index, CHECK_NULL);
2190 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2191 }
2192 JVM_END
2193
2194 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2195 {
2196 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2197 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2198 bounds_check(cp, index, CHECK_NULL);
2199 constantTag tag = cp->tag_at(index);
2200 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2201 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2202 }
2203 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2204 if (k == NULL) return NULL;
2205 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2206 }
2207 JVM_END
2208
2209 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2210 constantTag tag = cp->tag_at(index);
2211 if (!tag.is_method() && !tag.is_interface_method()) {
2212 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2213 }
2214 int klass_ref = cp->uncached_klass_ref_index_at(index);
2215 Klass* k_o;
2216 if (force_resolution) {
2217 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2218 } else {
2219 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2220 if (k_o == NULL) return NULL;
2221 }
2222 InstanceKlass* k = InstanceKlass::cast(k_o);
2223 Symbol* name = cp->uncached_name_ref_at(index);
2224 Symbol* sig = cp->uncached_signature_ref_at(index);
2225 methodHandle m (THREAD, k->find_method(name, sig));
2226 if (m.is_null()) {
2227 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2228 }
2229 oop method;
2230 if (!m->is_initializer() || m->is_static()) {
2231 method = Reflection::new_method(m, true, CHECK_NULL);
2232 } else {
2233 method = Reflection::new_constructor(m, CHECK_NULL);
2234 }
2235 return JNIHandles::make_local(THREAD, method);
2236 }
2237
2238 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2239 {
2240 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2241 JvmtiVMObjectAllocEventCollector oam;
2242 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2243 bounds_check(cp, index, CHECK_NULL);
2244 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2245 return res;
2246 }
2247 JVM_END
2248
2249 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2250 {
2251 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2252 JvmtiVMObjectAllocEventCollector oam;
2253 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2254 bounds_check(cp, index, CHECK_NULL);
2255 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2256 return res;
2257 }
2258 JVM_END
2259
2260 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2261 constantTag tag = cp->tag_at(index);
2262 if (!tag.is_field()) {
2263 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2264 }
2265 int klass_ref = cp->uncached_klass_ref_index_at(index);
2266 Klass* k_o;
2267 if (force_resolution) {
2268 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2269 } else {
2270 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2271 if (k_o == NULL) return NULL;
2272 }
2273 InstanceKlass* k = InstanceKlass::cast(k_o);
2274 Symbol* name = cp->uncached_name_ref_at(index);
2275 Symbol* sig = cp->uncached_signature_ref_at(index);
2276 fieldDescriptor fd;
2277 Klass* target_klass = k->find_field(name, sig, &fd);
2278 if (target_klass == NULL) {
2279 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2280 }
2281 oop field = Reflection::new_field(&fd, CHECK_NULL);
2282 return JNIHandles::make_local(THREAD, field);
2283 }
2284
2285 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2286 {
2287 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2288 JvmtiVMObjectAllocEventCollector oam;
2289 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2290 bounds_check(cp, index, CHECK_NULL);
2291 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2292 return res;
2293 }
2294 JVM_END
2295
2296 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2297 {
2298 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2299 JvmtiVMObjectAllocEventCollector oam;
2300 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2301 bounds_check(cp, index, CHECK_NULL);
2302 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2303 return res;
2304 }
2305 JVM_END
2306
2307 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2308 {
2309 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2310 JvmtiVMObjectAllocEventCollector oam;
2311 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2312 bounds_check(cp, index, CHECK_NULL);
2313 constantTag tag = cp->tag_at(index);
2314 if (!tag.is_field_or_method()) {
2315 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2316 }
2317 int klass_ref = cp->uncached_klass_ref_index_at(index);
2318 Symbol* klass_name = cp->klass_name_at(klass_ref);
2319 Symbol* member_name = cp->uncached_name_ref_at(index);
2320 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2321 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2322 objArrayHandle dest(THREAD, dest_o);
2323 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2324 dest->obj_at_put(0, str());
2325 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2326 dest->obj_at_put(1, str());
2327 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2328 dest->obj_at_put(2, str());
2329 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2330 }
2331 JVM_END
2332
2333 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2334 {
2335 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2336 JvmtiVMObjectAllocEventCollector oam;
2337 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2338 bounds_check(cp, index, CHECK_0);
2339 constantTag tag = cp->tag_at(index);
2340 if (!tag.is_field_or_method()) {
2341 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2342 }
2343 return (jint) cp->uncached_klass_ref_index_at(index);
2344 }
2345 JVM_END
2346
2347 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2348 {
2349 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2350 JvmtiVMObjectAllocEventCollector oam;
2351 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2352 bounds_check(cp, index, CHECK_0);
2353 constantTag tag = cp->tag_at(index);
2354 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2355 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2356 }
2357 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2358 }
2359 JVM_END
2360
2361 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2362 {
2363 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2364 JvmtiVMObjectAllocEventCollector oam;
2365 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2366 bounds_check(cp, index, CHECK_NULL);
2367 constantTag tag = cp->tag_at(index);
2368 if (!tag.is_name_and_type()) {
2369 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2370 }
2371 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2372 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2373 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2374 objArrayHandle dest(THREAD, dest_o);
2375 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2376 dest->obj_at_put(0, str());
2377 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2378 dest->obj_at_put(1, str());
2379 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2380 }
2381 JVM_END
2382
2383 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2384 {
2385 JVMWrapper("JVM_ConstantPoolGetIntAt");
2386 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2387 bounds_check(cp, index, CHECK_0);
2388 constantTag tag = cp->tag_at(index);
2389 if (!tag.is_int()) {
2390 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2391 }
2392 return cp->int_at(index);
2393 }
2394 JVM_END
2395
2396 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2397 {
2398 JVMWrapper("JVM_ConstantPoolGetLongAt");
2399 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2400 bounds_check(cp, index, CHECK_(0L));
2401 constantTag tag = cp->tag_at(index);
2402 if (!tag.is_long()) {
2403 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2404 }
2405 return cp->long_at(index);
2406 }
2407 JVM_END
2408
2409 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2410 {
2411 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2412 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2413 bounds_check(cp, index, CHECK_(0.0f));
2414 constantTag tag = cp->tag_at(index);
2415 if (!tag.is_float()) {
2416 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2417 }
2418 return cp->float_at(index);
2419 }
2420 JVM_END
2421
2422 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2423 {
2424 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2425 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2426 bounds_check(cp, index, CHECK_(0.0));
2427 constantTag tag = cp->tag_at(index);
2428 if (!tag.is_double()) {
2429 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2430 }
2431 return cp->double_at(index);
2432 }
2433 JVM_END
2434
2435 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2436 {
2437 JVMWrapper("JVM_ConstantPoolGetStringAt");
2438 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2439 bounds_check(cp, index, CHECK_NULL);
2440 constantTag tag = cp->tag_at(index);
2441 if (!tag.is_string()) {
2442 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2443 }
2444 oop str = cp->string_at(index, CHECK_NULL);
2445 return (jstring) JNIHandles::make_local(THREAD, str);
2446 }
2447 JVM_END
2448
2449 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2450 {
2451 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2452 JvmtiVMObjectAllocEventCollector oam;
2453 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2454 bounds_check(cp, index, CHECK_NULL);
2455 constantTag tag = cp->tag_at(index);
2456 if (!tag.is_symbol()) {
2457 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2458 }
2459 Symbol* sym = cp->symbol_at(index);
2460 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2461 return (jstring) JNIHandles::make_local(THREAD, str());
2462 }
2463 JVM_END
2464
2465 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2466 {
2467 JVMWrapper("JVM_ConstantPoolGetTagAt");
2468 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2469 bounds_check(cp, index, CHECK_0);
2470 constantTag tag = cp->tag_at(index);
2471 jbyte result = tag.value();
2472 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2473 // they are changed to the corresponding tags from the JVM spec, so that java code in
2474 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2475 if (tag.is_klass_or_reference()) {
2476 result = JVM_CONSTANT_Class;
2477 } else if (tag.is_string_index()) {
2478 result = JVM_CONSTANT_String;
2479 } else if (tag.is_method_type_in_error()) {
2480 result = JVM_CONSTANT_MethodType;
2481 } else if (tag.is_method_handle_in_error()) {
2482 result = JVM_CONSTANT_MethodHandle;
2483 } else if (tag.is_dynamic_constant_in_error()) {
2484 result = JVM_CONSTANT_Dynamic;
2485 }
2486 return result;
2487 }
2488 JVM_END
2489
2490 // Assertion support. //////////////////////////////////////////////////////////
2491
2492 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2493 JVMWrapper("JVM_DesiredAssertionStatus");
2494 assert(cls != NULL, "bad class");
2495
2496 oop r = JNIHandles::resolve(cls);
2497 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2498 if (java_lang_Class::is_primitive(r)) return false;
2499
2500 Klass* k = java_lang_Class::as_Klass(r);
2501 assert(k->is_instance_klass(), "must be an instance klass");
2502 if (!k->is_instance_klass()) return false;
2503
2504 ResourceMark rm(THREAD);
2505 const char* name = k->name()->as_C_string();
2506 bool system_class = k->class_loader() == NULL;
2507 return JavaAssertions::enabled(name, system_class);
2508
2509 JVM_END
2510
2511
2512 // Return a new AssertionStatusDirectives object with the fields filled in with
2513 // command-line assertion arguments (i.e., -ea, -da).
2514 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2515 JVMWrapper("JVM_AssertionStatusDirectives");
2516 JvmtiVMObjectAllocEventCollector oam;
2517 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2518 return JNIHandles::make_local(THREAD, asd);
2519 JVM_END
2520
2521 // Verification ////////////////////////////////////////////////////////////////////////////////
2522
2523 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2524
2525 // RedefineClasses support: bug 6214132 caused verification to fail.
2526 // All functions from this section should call the jvmtiThreadSate function:
2527 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2528 // The function returns a Klass* of the _scratch_class if the verifier
2529 // was invoked in the middle of the class redefinition.
2530 // Otherwise it returns its argument value which is the _the_class Klass*.
2531 // Please, refer to the description in the jvmtiThreadSate.hpp.
2532
2533 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2534 JVMWrapper("JVM_GetClassNameUTF");
2535 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2536 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2537 return k->name()->as_utf8();
2538 JVM_END
2539
2540
2541 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2542 JVMWrapper("JVM_GetClassCPTypes");
2543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2544 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2545 // types will have length zero if this is not an InstanceKlass
2546 // (length is determined by call to JVM_GetClassCPEntriesCount)
2547 if (k->is_instance_klass()) {
2548 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2549 for (int index = cp->length() - 1; index >= 0; index--) {
2550 constantTag tag = cp->tag_at(index);
2551 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2552 }
2553 }
2554 JVM_END
2555
2556
2557 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2558 JVMWrapper("JVM_GetClassCPEntriesCount");
2559 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2560 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2561 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2562 JVM_END
2563
2564
2565 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2566 JVMWrapper("JVM_GetClassFieldsCount");
2567 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2568 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2569 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2570 JVM_END
2571
2572
2573 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2574 JVMWrapper("JVM_GetClassMethodsCount");
2575 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2576 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2577 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2578 JVM_END
2579
2580
2581 // The following methods, used for the verifier, are never called with
2582 // array klasses, so a direct cast to InstanceKlass is safe.
2583 // Typically, these methods are called in a loop with bounds determined
2584 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2585 // zero for arrays.
2586 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2587 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2588 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2589 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2590 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2591 int length = method->checked_exceptions_length();
2592 if (length > 0) {
2593 CheckedExceptionElement* table= method->checked_exceptions_start();
2594 for (int i = 0; i < length; i++) {
2595 exceptions[i] = table[i].class_cp_index;
2596 }
2597 }
2598 JVM_END
2599
2600
2601 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2602 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2603 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2604 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2605 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2606 return method->checked_exceptions_length();
2607 JVM_END
2608
2609
2610 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2611 JVMWrapper("JVM_GetMethodIxByteCode");
2612 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2613 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2614 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2615 memcpy(code, method->code_base(), method->code_size());
2616 JVM_END
2617
2618
2619 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2620 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2621 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2622 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2623 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2624 return method->code_size();
2625 JVM_END
2626
2627
2628 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2629 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2630 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2631 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2632 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2633 ExceptionTable extable(method);
2634 entry->start_pc = extable.start_pc(entry_index);
2635 entry->end_pc = extable.end_pc(entry_index);
2636 entry->handler_pc = extable.handler_pc(entry_index);
2637 entry->catchType = extable.catch_type_index(entry_index);
2638 JVM_END
2639
2640
2641 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2642 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2643 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2644 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2645 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2646 return method->exception_table_length();
2647 JVM_END
2648
2649
2650 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2651 JVMWrapper("JVM_GetMethodIxModifiers");
2652 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2653 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2654 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2655 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2656 JVM_END
2657
2658
2659 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2660 JVMWrapper("JVM_GetFieldIxModifiers");
2661 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2662 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2663 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2664 JVM_END
2665
2666
2667 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2668 JVMWrapper("JVM_GetMethodIxLocalsCount");
2669 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2670 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2671 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2672 return method->max_locals();
2673 JVM_END
2674
2675
2676 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2677 JVMWrapper("JVM_GetMethodIxArgsSize");
2678 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2679 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2680 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2681 return method->size_of_parameters();
2682 JVM_END
2683
2684
2685 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2686 JVMWrapper("JVM_GetMethodIxMaxStack");
2687 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2688 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2689 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2690 return method->verifier_max_stack();
2691 JVM_END
2692
2693
2694 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2695 JVMWrapper("JVM_IsConstructorIx");
2696 ResourceMark rm(THREAD);
2697 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2698 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2699 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2700 return method->name() == vmSymbols::object_initializer_name();
2701 JVM_END
2702
2703
2704 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2705 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2706 ResourceMark rm(THREAD);
2707 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2708 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2709 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2710 return method->is_overpass();
2711 JVM_END
2712
2713 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2714 JVMWrapper("JVM_GetMethodIxIxUTF");
2715 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2716 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2717 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2718 return method->name()->as_utf8();
2719 JVM_END
2720
2721
2722 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2723 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2724 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2725 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2726 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2727 return method->signature()->as_utf8();
2728 JVM_END
2729
2730 /**
2731 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2732 * read entries in the constant pool. Since the old verifier always
2733 * works on a copy of the code, it will not see any rewriting that
2734 * may possibly occur in the middle of verification. So it is important
2735 * that nothing it calls tries to use the cpCache instead of the raw
2736 * constant pool, so we must use cp->uncached_x methods when appropriate.
2737 */
2738 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2739 JVMWrapper("JVM_GetCPFieldNameUTF");
2740 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2741 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2742 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2743 switch (cp->tag_at(cp_index).value()) {
2744 case JVM_CONSTANT_Fieldref:
2745 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2746 default:
2747 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2748 }
2749 ShouldNotReachHere();
2750 return NULL;
2751 JVM_END
2752
2753
2754 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2755 JVMWrapper("JVM_GetCPMethodNameUTF");
2756 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2757 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2758 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2759 switch (cp->tag_at(cp_index).value()) {
2760 case JVM_CONSTANT_InterfaceMethodref:
2761 case JVM_CONSTANT_Methodref:
2762 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2763 default:
2764 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2765 }
2766 ShouldNotReachHere();
2767 return NULL;
2768 JVM_END
2769
2770
2771 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2772 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2773 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2774 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2775 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2776 switch (cp->tag_at(cp_index).value()) {
2777 case JVM_CONSTANT_InterfaceMethodref:
2778 case JVM_CONSTANT_Methodref:
2779 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2780 default:
2781 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2782 }
2783 ShouldNotReachHere();
2784 return NULL;
2785 JVM_END
2786
2787
2788 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2789 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2790 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2791 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2792 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2793 switch (cp->tag_at(cp_index).value()) {
2794 case JVM_CONSTANT_Fieldref:
2795 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2796 default:
2797 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2798 }
2799 ShouldNotReachHere();
2800 return NULL;
2801 JVM_END
2802
2803
2804 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2805 JVMWrapper("JVM_GetCPClassNameUTF");
2806 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2807 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2808 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2809 Symbol* classname = cp->klass_name_at(cp_index);
2810 return classname->as_utf8();
2811 JVM_END
2812
2813
2814 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2815 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2816 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2817 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2818 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2819 switch (cp->tag_at(cp_index).value()) {
2820 case JVM_CONSTANT_Fieldref: {
2821 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2822 Symbol* classname = cp->klass_name_at(class_index);
2823 return classname->as_utf8();
2824 }
2825 default:
2826 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2827 }
2828 ShouldNotReachHere();
2829 return NULL;
2830 JVM_END
2831
2832
2833 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2834 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2835 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2836 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2837 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2838 switch (cp->tag_at(cp_index).value()) {
2839 case JVM_CONSTANT_Methodref:
2840 case JVM_CONSTANT_InterfaceMethodref: {
2841 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2842 Symbol* classname = cp->klass_name_at(class_index);
2843 return classname->as_utf8();
2844 }
2845 default:
2846 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2847 }
2848 ShouldNotReachHere();
2849 return NULL;
2850 JVM_END
2851
2852
2853 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2854 JVMWrapper("JVM_GetCPFieldModifiers");
2855 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2856 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2857 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2858 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2859 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2860 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2861 switch (cp->tag_at(cp_index).value()) {
2862 case JVM_CONSTANT_Fieldref: {
2863 Symbol* name = cp->uncached_name_ref_at(cp_index);
2864 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2865 InstanceKlass* ik = InstanceKlass::cast(k_called);
2866 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2867 if (fs.name() == name && fs.signature() == signature) {
2868 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2869 }
2870 }
2871 return -1;
2872 }
2873 default:
2874 fatal("JVM_GetCPFieldModifiers: illegal constant");
2875 }
2876 ShouldNotReachHere();
2877 return 0;
2878 JVM_END
2879
2880
2881 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2882 JVMWrapper("JVM_GetCPMethodModifiers");
2883 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2884 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2885 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2886 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2887 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2888 switch (cp->tag_at(cp_index).value()) {
2889 case JVM_CONSTANT_Methodref:
2890 case JVM_CONSTANT_InterfaceMethodref: {
2891 Symbol* name = cp->uncached_name_ref_at(cp_index);
2892 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2893 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2894 int methods_count = methods->length();
2895 for (int i = 0; i < methods_count; i++) {
2896 Method* method = methods->at(i);
2897 if (method->name() == name && method->signature() == signature) {
2898 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2899 }
2900 }
2901 return -1;
2902 }
2903 default:
2904 fatal("JVM_GetCPMethodModifiers: illegal constant");
2905 }
2906 ShouldNotReachHere();
2907 return 0;
2908 JVM_END
2909
2910
2911 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2912
2913 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2914 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2915 JVM_END
2916
2917
2918 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2919 JVMWrapper("JVM_IsSameClassPackage");
2920 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2921 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2922 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2923 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2924 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2925 JVM_END
2926
2927 // Printing support //////////////////////////////////////////////////
2928 extern "C" {
2929
2930 ATTRIBUTE_PRINTF(3, 0)
2931 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2932 // Reject count values that are negative signed values converted to
2933 // unsigned; see bug 4399518, 4417214
2934 if ((intptr_t)count <= 0) return -1;
2935
2936 int result = os::vsnprintf(str, count, fmt, args);
2937 if (result > 0 && (size_t)result >= count) {
2938 result = -1;
2939 }
2940
2941 return result;
2942 }
2943
2944 ATTRIBUTE_PRINTF(3, 4)
2945 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2946 va_list args;
2947 int len;
2948 va_start(args, fmt);
2949 len = jio_vsnprintf(str, count, fmt, args);
2950 va_end(args);
2951 return len;
2952 }
2953
2954 ATTRIBUTE_PRINTF(2, 3)
2955 int jio_fprintf(FILE* f, const char *fmt, ...) {
2956 int len;
2957 va_list args;
2958 va_start(args, fmt);
2959 len = jio_vfprintf(f, fmt, args);
2960 va_end(args);
2961 return len;
2962 }
2963
2964 ATTRIBUTE_PRINTF(2, 0)
2965 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2966 if (Arguments::vfprintf_hook() != NULL) {
2967 return Arguments::vfprintf_hook()(f, fmt, args);
2968 } else {
2969 return vfprintf(f, fmt, args);
2970 }
2971 }
2972
2973 ATTRIBUTE_PRINTF(1, 2)
2974 JNIEXPORT int jio_printf(const char *fmt, ...) {
2975 int len;
2976 va_list args;
2977 va_start(args, fmt);
2978 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2979 va_end(args);
2980 return len;
2981 }
2982
2983 // HotSpot specific jio method
2984 void jio_print(const char* s, size_t len) {
2985 // Try to make this function as atomic as possible.
2986 if (Arguments::vfprintf_hook() != NULL) {
2987 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2988 } else {
2989 // Make an unused local variable to avoid warning from gcc compiler.
2990 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2991 }
2992 }
2993
2994 } // Extern C
2995
2996 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2997
2998 // In most of the JVM thread support functions we need to access the
2999 // thread through a ThreadsListHandle to prevent it from exiting and
3000 // being reclaimed while we try to operate on it. The exceptions to this
3001 // rule are when operating on the current thread, or if the monitor of
3002 // the target java.lang.Thread is locked at the Java level - in both
3003 // cases the target cannot exit.
3004
3005 static void thread_entry(JavaThread* thread, TRAPS) {
3006 HandleMark hm(THREAD);
3007 Handle obj(THREAD, thread->threadObj());
3008 JavaValue result(T_VOID);
3009 JavaCalls::call_virtual(&result,
3010 obj,
3011 SystemDictionary::Thread_klass(),
3012 vmSymbols::run_method_name(),
3013 vmSymbols::void_method_signature(),
3014 THREAD);
3015 }
3016
3017
3018 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3019 JVMWrapper("JVM_StartThread");
3020 JavaThread *native_thread = NULL;
3021
3022 // We cannot hold the Threads_lock when we throw an exception,
3023 // due to rank ordering issues. Example: we might need to grab the
3024 // Heap_lock while we construct the exception.
3025 bool throw_illegal_thread_state = false;
3026
3027 // We must release the Threads_lock before we can post a jvmti event
3028 // in Thread::start.
3029 {
3030 // Ensure that the C++ Thread and OSThread structures aren't freed before
3031 // we operate.
3032 MutexLocker mu(Threads_lock);
3033
3034 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3035 // re-starting an already started thread, so we should usually find
3036 // that the JavaThread is null. However for a JNI attached thread
3037 // there is a small window between the Thread object being created
3038 // (with its JavaThread set) and the update to its threadStatus, so we
3039 // have to check for this
3040 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
3041 throw_illegal_thread_state = true;
3042 } else {
3043 // We could also check the stillborn flag to see if this thread was already stopped, but
3044 // for historical reasons we let the thread detect that itself when it starts running
3045
3046 jlong size =
3047 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3048 // Allocate the C++ Thread structure and create the native thread. The
3049 // stack size retrieved from java is 64-bit signed, but the constructor takes
3050 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3051 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3052 // - Avoid passing negative values which would result in really large stacks.
3053 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3054 size_t sz = size > 0 ? (size_t) size : 0;
3055 native_thread = new JavaThread(&thread_entry, sz);
3056
3057 // At this point it may be possible that no osthread was created for the
3058 // JavaThread due to lack of memory. Check for this situation and throw
3059 // an exception if necessary. Eventually we may want to change this so
3060 // that we only grab the lock if the thread was created successfully -
3061 // then we can also do this check and throw the exception in the
3062 // JavaThread constructor.
3063 if (native_thread->osthread() != NULL) {
3064 // Note: the current thread is not being used within "prepare".
3065 native_thread->prepare(jthread);
3066 }
3067 }
3068 }
3069
3070 if (throw_illegal_thread_state) {
3071 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3072 }
3073
3074 assert(native_thread != NULL, "Starting null thread?");
3075
3076 if (native_thread->osthread() == NULL) {
3077 // No one should hold a reference to the 'native_thread'.
3078 native_thread->smr_delete();
3079 if (JvmtiExport::should_post_resource_exhausted()) {
3080 JvmtiExport::post_resource_exhausted(
3081 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3082 os::native_thread_creation_failed_msg());
3083 }
3084 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3085 os::native_thread_creation_failed_msg());
3086 }
3087
3088 #if INCLUDE_JFR
3089 if (Jfr::is_recording() && EventThreadStart::is_enabled() &&
3090 EventThreadStart::is_stacktrace_enabled()) {
3091 JfrThreadLocal* tl = native_thread->jfr_thread_local();
3092 // skip Thread.start() and Thread.start0()
3093 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2));
3094 }
3095 #endif
3096
3097 Thread::start(native_thread);
3098
3099 JVM_END
3100
3101
3102 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3103 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
3104 // but is thought to be reliable and simple. In the case, where the receiver is the
3105 // same thread as the sender, no VM_Operation is needed.
3106 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3107 JVMWrapper("JVM_StopThread");
3108
3109 // A nested ThreadsListHandle will grab the Threads_lock so create
3110 // tlh before we resolve throwable.
3111 ThreadsListHandle tlh(thread);
3112 oop java_throwable = JNIHandles::resolve(throwable);
3113 if (java_throwable == NULL) {
3114 THROW(vmSymbols::java_lang_NullPointerException());
3115 }
3116 oop java_thread = NULL;
3117 JavaThread* receiver = NULL;
3118 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3119 Events::log_exception(thread,
3120 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3121 p2i(receiver), p2i(java_thread), p2i(throwable));
3122
3123 if (is_alive) {
3124 // jthread refers to a live JavaThread.
3125 if (thread == receiver) {
3126 // Exception is getting thrown at self so no VM_Operation needed.
3127 THROW_OOP(java_throwable);
3128 } else {
3129 // Use a VM_Operation to throw the exception.
3130 Thread::send_async_exception(java_thread, java_throwable);
3131 }
3132 } else {
3133 // Either:
3134 // - target thread has not been started before being stopped, or
3135 // - target thread already terminated
3136 // We could read the threadStatus to determine which case it is
3137 // but that is overkill as it doesn't matter. We must set the
3138 // stillborn flag for the first case, and if the thread has already
3139 // exited setting this flag has no effect.
3140 java_lang_Thread::set_stillborn(java_thread);
3141 }
3142 JVM_END
3143
3144
3145 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3146 JVMWrapper("JVM_IsThreadAlive");
3147
3148 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3149 return java_lang_Thread::is_alive(thread_oop);
3150 JVM_END
3151
3152
3153 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3154 JVMWrapper("JVM_SuspendThread");
3155
3156 ThreadsListHandle tlh(thread);
3157 JavaThread* receiver = NULL;
3158 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3159 if (is_alive) {
3160 // jthread refers to a live JavaThread.
3161 {
3162 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3163 if (receiver->is_external_suspend()) {
3164 // Don't allow nested external suspend requests. We can't return
3165 // an error from this interface so just ignore the problem.
3166 return;
3167 }
3168 if (receiver->is_exiting()) { // thread is in the process of exiting
3169 return;
3170 }
3171 receiver->set_external_suspend();
3172 }
3173
3174 // java_suspend() will catch threads in the process of exiting
3175 // and will ignore them.
3176 receiver->java_suspend();
3177
3178 // It would be nice to have the following assertion in all the
3179 // time, but it is possible for a racing resume request to have
3180 // resumed this thread right after we suspended it. Temporarily
3181 // enable this assertion if you are chasing a different kind of
3182 // bug.
3183 //
3184 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3185 // receiver->is_being_ext_suspended(), "thread is not suspended");
3186 }
3187 JVM_END
3188
3189
3190 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3191 JVMWrapper("JVM_ResumeThread");
3192
3193 ThreadsListHandle tlh(thread);
3194 JavaThread* receiver = NULL;
3195 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3196 if (is_alive) {
3197 // jthread refers to a live JavaThread.
3198
3199 // This is the original comment for this Threads_lock grab:
3200 // We need to *always* get the threads lock here, since this operation cannot be allowed during
3201 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3202 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3203 // looks at it.
3204 //
3205 // The above comment dates back to when we had both internal and
3206 // external suspend APIs that shared a common underlying mechanism.
3207 // External suspend is now entirely cooperative and doesn't share
3208 // anything with internal suspend. That said, there are some
3209 // assumptions in the VM that an external resume grabs the
3210 // Threads_lock. We can't drop the Threads_lock grab here until we
3211 // resolve the assumptions that exist elsewhere.
3212 //
3213 MutexLocker ml(Threads_lock);
3214 receiver->java_resume();
3215 }
3216 JVM_END
3217
3218
3219 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3220 JVMWrapper("JVM_SetThreadPriority");
3221
3222 ThreadsListHandle tlh(thread);
3223 oop java_thread = NULL;
3224 JavaThread* receiver = NULL;
3225 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3226 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3227
3228 if (is_alive) {
3229 // jthread refers to a live JavaThread.
3230 Thread::set_priority(receiver, (ThreadPriority)prio);
3231 }
3232 // Implied else: If the JavaThread hasn't started yet, then the
3233 // priority set in the java.lang.Thread object above will be pushed
3234 // down when it does start.
3235 JVM_END
3236
3237
3238 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3239 JVMWrapper("JVM_Yield");
3240 if (os::dont_yield()) return;
3241 HOTSPOT_THREAD_YIELD();
3242 os::naked_yield();
3243 JVM_END
3244
3245 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3246 assert(event != NULL, "invariant");
3247 assert(event->should_commit(), "invariant");
3248 event->set_time(millis);
3249 event->commit();
3250 }
3251
3252 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3253 JVMWrapper("JVM_Sleep");
3254
3255 if (millis < 0) {
3256 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3257 }
3258
3259 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3260 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3261 }
3262
3263 // Save current thread state and restore it at the end of this block.
3264 // And set new thread state to SLEEPING.
3265 JavaThreadSleepState jtss(thread);
3266
3267 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3268 EventThreadSleep event;
3269
3270 if (millis == 0) {
3271 os::naked_yield();
3272 } else {
3273 ThreadState old_state = thread->osthread()->get_state();
3274 thread->osthread()->set_state(SLEEPING);
3275 if (!thread->sleep(millis)) { // interrupted
3276 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3277 // us while we were sleeping. We do not overwrite those.
3278 if (!HAS_PENDING_EXCEPTION) {
3279 if (event.should_commit()) {
3280 post_thread_sleep_event(&event, millis);
3281 }
3282 HOTSPOT_THREAD_SLEEP_END(1);
3283
3284 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3285 // to properly restore the thread state. That's likely wrong.
3286 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3287 }
3288 }
3289 thread->osthread()->set_state(old_state);
3290 }
3291 if (event.should_commit()) {
3292 post_thread_sleep_event(&event, millis);
3293 }
3294 HOTSPOT_THREAD_SLEEP_END(0);
3295 JVM_END
3296
3297 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3298 JVMWrapper("JVM_CurrentThread");
3299 oop jthread = thread->threadObj();
3300 assert(jthread != NULL, "no current thread!");
3301 return JNIHandles::make_local(THREAD, jthread);
3302 JVM_END
3303
3304 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3305 JVMWrapper("JVM_Interrupt");
3306
3307 ThreadsListHandle tlh(thread);
3308 JavaThread* receiver = NULL;
3309 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3310 if (is_alive) {
3311 // jthread refers to a live JavaThread.
3312 receiver->interrupt();
3313 }
3314 JVM_END
3315
3316
3317 // Return true iff the current thread has locked the object passed in
3318
3319 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3320 JVMWrapper("JVM_HoldsLock");
3321 assert(THREAD->is_Java_thread(), "sanity check");
3322 if (obj == NULL) {
3323 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3324 }
3325 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3326 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3327 JVM_END
3328
3329
3330 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3331 JVMWrapper("JVM_DumpAllStacks");
3332 VM_PrintThreads op;
3333 VMThread::execute(&op);
3334 if (JvmtiExport::should_post_data_dump()) {
3335 JvmtiExport::post_data_dump();
3336 }
3337 JVM_END
3338
3339 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3340 JVMWrapper("JVM_SetNativeThreadName");
3341
3342 // We don't use a ThreadsListHandle here because the current thread
3343 // must be alive.
3344 oop java_thread = JNIHandles::resolve_non_null(jthread);
3345 JavaThread* thr = java_lang_Thread::thread(java_thread);
3346 if (thread == thr && !thr->has_attached_via_jni()) {
3347 // Thread naming is only supported for the current thread and
3348 // we don't set the name of an attached thread to avoid stepping
3349 // on other programs.
3350 ResourceMark rm(thread);
3351 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3352 os::set_native_thread_name(thread_name);
3353 }
3354 JVM_END
3355
3356 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3357
3358 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3359 JVMWrapper("JVM_GetClassContext");
3360 ResourceMark rm(THREAD);
3361 JvmtiVMObjectAllocEventCollector oam;
3362 vframeStream vfst(thread);
3363
3364 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3365 // This must only be called from SecurityManager.getClassContext
3366 Method* m = vfst.method();
3367 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3368 m->name() == vmSymbols::getClassContext_name() &&
3369 m->signature() == vmSymbols::void_class_array_signature())) {
3370 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3371 }
3372 }
3373
3374 // Collect method holders
3375 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3376 for (; !vfst.at_end(); vfst.security_next()) {
3377 Method* m = vfst.method();
3378 // Native frames are not returned
3379 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3380 Klass* holder = m->method_holder();
3381 assert(holder->is_klass(), "just checking");
3382 klass_array->append(holder);
3383 }
3384 }
3385
3386 // Create result array of type [Ljava/lang/Class;
3387 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3388 // Fill in mirrors corresponding to method holders
3389 for (int i = 0; i < klass_array->length(); i++) {
3390 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3391 }
3392
3393 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3394 JVM_END
3395
3396
3397 // java.lang.Package ////////////////////////////////////////////////////////////////
3398
3399
3400 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3401 JVMWrapper("JVM_GetSystemPackage");
3402 ResourceMark rm(THREAD);
3403 JvmtiVMObjectAllocEventCollector oam;
3404 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3405 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3406 return (jstring) JNIHandles::make_local(THREAD, result);
3407 JVM_END
3408
3409
3410 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3411 JVMWrapper("JVM_GetSystemPackages");
3412 JvmtiVMObjectAllocEventCollector oam;
3413 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3414 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3415 JVM_END
3416
3417
3418 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3419
3420
3421 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3422 JVMWrapper("JVM_GetAndClearReferencePendingList");
3423
3424 MonitorLocker ml(Heap_lock);
3425 oop ref = Universe::reference_pending_list();
3426 if (ref != NULL) {
3427 Universe::clear_reference_pending_list();
3428 }
3429 return JNIHandles::make_local(THREAD, ref);
3430 JVM_END
3431
3432 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3433 JVMWrapper("JVM_HasReferencePendingList");
3434 MonitorLocker ml(Heap_lock);
3435 return Universe::has_reference_pending_list();
3436 JVM_END
3437
3438 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3439 JVMWrapper("JVM_WaitForReferencePendingList");
3440 MonitorLocker ml(Heap_lock);
3441 while (!Universe::has_reference_pending_list()) {
3442 ml.wait();
3443 }
3444 JVM_END
3445
3446
3447 // ObjectInputStream ///////////////////////////////////////////////////////////////
3448
3449 // Return the first user-defined class loader up the execution stack, or null
3450 // if only code from the bootstrap or platform class loader is on the stack.
3451
3452 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3453 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3454 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3455 oop loader = vfst.method()->method_holder()->class_loader();
3456 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3457 return JNIHandles::make_local(THREAD, loader);
3458 }
3459 }
3460 return NULL;
3461 JVM_END
3462
3463
3464 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3465
3466
3467 // resolve array handle and check arguments
3468 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3469 if (arr == NULL) {
3470 THROW_0(vmSymbols::java_lang_NullPointerException());
3471 }
3472 oop a = JNIHandles::resolve_non_null(arr);
3473 if (!a->is_array()) {
3474 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3475 } else if (type_array_only && !a->is_typeArray()) {
3476 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3477 }
3478 return arrayOop(a);
3479 }
3480
3481
3482 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3483 JVMWrapper("JVM_GetArrayLength");
3484 arrayOop a = check_array(env, arr, false, CHECK_0);
3485 return a->length();
3486 JVM_END
3487
3488
3489 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3490 JVMWrapper("JVM_Array_Get");
3491 JvmtiVMObjectAllocEventCollector oam;
3492 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3493 jvalue value;
3494 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3495 oop box = Reflection::box(&value, type, CHECK_NULL);
3496 return JNIHandles::make_local(THREAD, box);
3497 JVM_END
3498
3499
3500 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3501 JVMWrapper("JVM_GetPrimitiveArrayElement");
3502 jvalue value;
3503 value.i = 0; // to initialize value before getting used in CHECK
3504 arrayOop a = check_array(env, arr, true, CHECK_(value));
3505 assert(a->is_typeArray(), "just checking");
3506 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3507 BasicType wide_type = (BasicType) wCode;
3508 if (type != wide_type) {
3509 Reflection::widen(&value, type, wide_type, CHECK_(value));
3510 }
3511 return value;
3512 JVM_END
3513
3514
3515 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3516 JVMWrapper("JVM_SetArrayElement");
3517 arrayOop a = check_array(env, arr, false, CHECK);
3518 oop box = JNIHandles::resolve(val);
3519 jvalue value;
3520 value.i = 0; // to initialize value before getting used in CHECK
3521 BasicType value_type;
3522 if (a->is_objArray()) {
3523 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3524 value_type = Reflection::unbox_for_regular_object(box, &value);
3525 } else {
3526 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3527 }
3528 Reflection::array_set(&value, a, index, value_type, CHECK);
3529 JVM_END
3530
3531
3532 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3533 JVMWrapper("JVM_SetPrimitiveArrayElement");
3534 arrayOop a = check_array(env, arr, true, CHECK);
3535 assert(a->is_typeArray(), "just checking");
3536 BasicType value_type = (BasicType) vCode;
3537 Reflection::array_set(&v, a, index, value_type, CHECK);
3538 JVM_END
3539
3540
3541 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3542 JVMWrapper("JVM_NewArray");
3543 JvmtiVMObjectAllocEventCollector oam;
3544 oop element_mirror = JNIHandles::resolve(eltClass);
3545 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3546 return JNIHandles::make_local(THREAD, result);
3547 JVM_END
3548
3549
3550 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3551 JVMWrapper("JVM_NewMultiArray");
3552 JvmtiVMObjectAllocEventCollector oam;
3553 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3554 oop element_mirror = JNIHandles::resolve(eltClass);
3555 assert(dim_array->is_typeArray(), "just checking");
3556 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3557 return JNIHandles::make_local(THREAD, result);
3558 JVM_END
3559
3560
3561 // Library support ///////////////////////////////////////////////////////////////////////////
3562
3563 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3564 //%note jvm_ct
3565 JVMWrapper("JVM_LoadLibrary");
3566 char ebuf[1024];
3567 void *load_result;
3568 {
3569 ThreadToNativeFromVM ttnfvm(thread);
3570 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3571 }
3572 if (load_result == NULL) {
3573 char msg[1024];
3574 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3575 // Since 'ebuf' may contain a string encoded using
3576 // platform encoding scheme, we need to pass
3577 // Exceptions::unsafe_to_utf8 to the new_exception method
3578 // as the last argument. See bug 6367357.
3579 Handle h_exception =
3580 Exceptions::new_exception(thread,
3581 vmSymbols::java_lang_UnsatisfiedLinkError(),
3582 msg, Exceptions::unsafe_to_utf8);
3583
3584 THROW_HANDLE_0(h_exception);
3585 }
3586 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3587 return load_result;
3588 JVM_END
3589
3590
3591 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3592 JVMWrapper("JVM_UnloadLibrary");
3593 os::dll_unload(handle);
3594 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3595 JVM_END
3596
3597
3598 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3599 JVMWrapper("JVM_FindLibraryEntry");
3600 void* find_result = os::dll_lookup(handle, name);
3601 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3602 find_result != NULL ? "Found" : "Failed to find",
3603 name, p2i(handle));
3604 return find_result;
3605 JVM_END
3606
3607
3608 // JNI version ///////////////////////////////////////////////////////////////////////////////
3609
3610 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3611 JVMWrapper("JVM_IsSupportedJNIVersion");
3612 return Threads::is_supported_jni_version_including_1_1(version);
3613 JVM_END
3614
3615
3616 // String support ///////////////////////////////////////////////////////////////////////////
3617
3618 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3619 JVMWrapper("JVM_InternString");
3620 JvmtiVMObjectAllocEventCollector oam;
3621 if (str == NULL) return NULL;
3622 oop string = JNIHandles::resolve_non_null(str);
3623 oop result = StringTable::intern(string, CHECK_NULL);
3624 return (jstring) JNIHandles::make_local(THREAD, result);
3625 JVM_END
3626
3627
3628 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3629
3630 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3631 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3632 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3633 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3634 // nature. JavaThreads will be "in native" when using this API from JDK code.
3635
3636
3637 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3638 VM_Exit::block_if_vm_exited();
3639 JVMWrapper("JVM_RawMonitorCreate");
3640 return new os::PlatformMutex();
3641 }
3642
3643
3644 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3645 VM_Exit::block_if_vm_exited();
3646 JVMWrapper("JVM_RawMonitorDestroy");
3647 delete ((os::PlatformMutex*) mon);
3648 }
3649
3650
3651 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3652 VM_Exit::block_if_vm_exited();
3653 JVMWrapper("JVM_RawMonitorEnter");
3654 ((os::PlatformMutex*) mon)->lock();
3655 return 0;
3656 }
3657
3658
3659 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3660 VM_Exit::block_if_vm_exited();
3661 JVMWrapper("JVM_RawMonitorExit");
3662 ((os::PlatformMutex*) mon)->unlock();
3663 }
3664
3665
3666 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3667
3668 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3669 Handle loader, Handle protection_domain,
3670 jboolean throwError, TRAPS) {
3671 // Security Note:
3672 // The Java level wrapper will perform the necessary security check allowing
3673 // us to pass the NULL as the initiating class loader. The VM is responsible for
3674 // the checkPackageAccess relative to the initiating class loader via the
3675 // protection_domain. The protection_domain is passed as NULL by the java code
3676 // if there is no security manager in 3-arg Class.forName().
3677 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3678
3679 // Check if we should initialize the class
3680 if (init && klass->is_instance_klass()) {
3681 klass->initialize(CHECK_NULL);
3682 }
3683 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3684 }
3685
3686
3687 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3688
3689 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3690 JVMWrapper("JVM_InvokeMethod");
3691 Handle method_handle;
3692 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3693 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3694 Handle receiver(THREAD, JNIHandles::resolve(obj));
3695 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3696 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3697 jobject res = JNIHandles::make_local(THREAD, result);
3698 if (JvmtiExport::should_post_vm_object_alloc()) {
3699 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3700 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3701 if (java_lang_Class::is_primitive(ret_type)) {
3702 // Only for primitive type vm allocates memory for java object.
3703 // See box() method.
3704 JvmtiExport::post_vm_object_alloc(thread, result);
3705 }
3706 }
3707 return res;
3708 } else {
3709 THROW_0(vmSymbols::java_lang_StackOverflowError());
3710 }
3711 JVM_END
3712
3713
3714 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3715 JVMWrapper("JVM_NewInstanceFromConstructor");
3716 oop constructor_mirror = JNIHandles::resolve(c);
3717 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3718 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3719 jobject res = JNIHandles::make_local(THREAD, result);
3720 if (JvmtiExport::should_post_vm_object_alloc()) {
3721 JvmtiExport::post_vm_object_alloc(thread, result);
3722 }
3723 return res;
3724 JVM_END
3725
3726 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3727
3728 JVM_LEAF(jboolean, JVM_SupportsCX8())
3729 JVMWrapper("JVM_SupportsCX8");
3730 return VM_Version::supports_cx8();
3731 JVM_END
3732
3733 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3734 JVMWrapper("JVM_InitializeFromArchive");
3735 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3736 assert(k->is_klass(), "just checking");
3737 HeapShared::initialize_from_archived_subgraph(k);
3738 JVM_END
3739
3740 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3741 jclass caller,
3742 jstring invokedName,
3743 jobject invokedType,
3744 jobject methodType,
3745 jobject implMethodMember,
3746 jobject instantiatedMethodType,
3747 jclass lambdaProxyClass))
3748 JVMWrapper("JVM_RegisterLambdaProxyClassForArchiving");
3749 #if INCLUDE_CDS
3750 if (!DynamicDumpSharedSpaces) {
3751 return;
3752 }
3753
3754 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3755 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3756 if (caller_ik->is_hidden() || caller_ik->is_unsafe_anonymous()) {
3757 // VM anonymous classes and hidden classes not of type lambda proxy classes are currently not being archived.
3758 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3759 // registered for archiving.
3760 return;
3761 }
3762 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3763 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3764 assert(lambda_ik->is_hidden(), "must be a hidden class");
3765 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3766
3767 Symbol* invoked_name = NULL;
3768 if (invokedName != NULL) {
3769 invoked_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(invokedName));
3770 }
3771 Handle invoked_type_oop(THREAD, JNIHandles::resolve_non_null(invokedType));
3772 Symbol* invoked_type = java_lang_invoke_MethodType::as_signature(invoked_type_oop(), true);
3773
3774 Handle method_type_oop(THREAD, JNIHandles::resolve_non_null(methodType));
3775 Symbol* method_type = java_lang_invoke_MethodType::as_signature(method_type_oop(), true);
3776
3777 Handle impl_method_member_oop(THREAD, JNIHandles::resolve_non_null(implMethodMember));
3778 assert(java_lang_invoke_MemberName::is_method(impl_method_member_oop()), "must be");
3779 Method* m = java_lang_invoke_MemberName::vmtarget(impl_method_member_oop());
3780
3781 Handle instantiated_method_type_oop(THREAD, JNIHandles::resolve_non_null(instantiatedMethodType));
3782 Symbol* instantiated_method_type = java_lang_invoke_MethodType::as_signature(instantiated_method_type_oop(), true);
3783
3784 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, invoked_name, invoked_type,
3785 method_type, m, instantiated_method_type);
3786 #endif // INCLUDE_CDS
3787 JVM_END
3788
3789 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3790 jclass caller,
3791 jstring invokedName,
3792 jobject invokedType,
3793 jobject methodType,
3794 jobject implMethodMember,
3795 jobject instantiatedMethodType,
3796 jboolean initialize))
3797 JVMWrapper("JVM_LookupLambdaProxyClassFromArchive");
3798 #if INCLUDE_CDS
3799 if (!DynamicArchive::is_mapped()) {
3800 return NULL;
3801 }
3802
3803 if (invokedName == NULL || invokedType == NULL || methodType == NULL ||
3804 implMethodMember == NULL || instantiatedMethodType == NULL) {
3805 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
3806 }
3807
3808 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3809 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3810 if (!caller_ik->is_shared()) {
3811 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3812 return NULL;
3813 }
3814
3815 Symbol* invoked_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(invokedName));
3816 Handle invoked_type_oop(THREAD, JNIHandles::resolve_non_null(invokedType));
3817 Symbol* invoked_type = java_lang_invoke_MethodType::as_signature(invoked_type_oop(), true);
3818
3819 Handle method_type_oop(THREAD, JNIHandles::resolve_non_null(methodType));
3820 Symbol* method_type = java_lang_invoke_MethodType::as_signature(method_type_oop(), true);
3821
3822 Handle impl_method_member_oop(THREAD, JNIHandles::resolve_non_null(implMethodMember));
3823 assert(java_lang_invoke_MemberName::is_method(impl_method_member_oop()), "must be");
3824 Method* m = java_lang_invoke_MemberName::vmtarget(impl_method_member_oop());
3825
3826 Handle instantiated_method_type_oop(THREAD, JNIHandles::resolve_non_null(instantiatedMethodType));
3827 Symbol* instantiated_method_type = java_lang_invoke_MethodType::as_signature(instantiated_method_type_oop(), true);
3828
3829 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, invoked_name, invoked_type,
3830 method_type, m, instantiated_method_type);
3831 jclass jcls = NULL;
3832 if (lambda_ik != NULL) {
3833 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, initialize, THREAD);
3834 jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3835 }
3836 return jcls;
3837 #else
3838 return NULL;
3839 #endif // INCLUDE_CDS
3840 JVM_END
3841
3842 JVM_ENTRY(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3843 JVMWrapper("JVM_IsCDSDumpingEnable");
3844 return DynamicDumpSharedSpaces;
3845 JVM_END
3846
3847 JVM_ENTRY(jboolean, JVM_IsCDSSharingEnabled(JNIEnv* env))
3848 JVMWrapper("JVM_IsCDSSharingEnable");
3849 return UseSharedSpaces;
3850 JVM_END
3851
3852 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForCDSDump())
3853 JVMWrapper("JVM_GetRandomSeedForCDSDump");
3854 if (DumpSharedSpaces) {
3855 const char* release = Abstract_VM_Version::vm_release();
3856 const char* dbg_level = Abstract_VM_Version::jdk_debug_level();
3857 const char* version = VM_Version::internal_vm_info_string();
3858 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3859 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3860 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3861 seed += (jlong)Abstract_VM_Version::vm_major_version();
3862 seed += (jlong)Abstract_VM_Version::vm_minor_version();
3863 seed += (jlong)Abstract_VM_Version::vm_security_version();
3864 seed += (jlong)Abstract_VM_Version::vm_patch_version();
3865 if (seed == 0) { // don't let this ever be zero.
3866 seed = 0x87654321;
3867 }
3868 log_debug(cds)("JVM_GetRandomSeedForCDSDump() = " JLONG_FORMAT, seed);
3869 return seed;
3870 } else {
3871 return 0;
3872 }
3873 JVM_END
3874
3875 // Returns an array of all live Thread objects (VM internal JavaThreads,
3876 // jvmti agent threads, and JNI attaching threads are skipped)
3877 // See CR 6404306 regarding JNI attaching threads
3878 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3879 ResourceMark rm(THREAD);
3880 ThreadsListEnumerator tle(THREAD, false, false);
3881 JvmtiVMObjectAllocEventCollector oam;
3882
3883 int num_threads = tle.num_threads();
3884 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3885 objArrayHandle threads_ah(THREAD, r);
3886
3887 for (int i = 0; i < num_threads; i++) {
3888 Handle h = tle.get_threadObj(i);
3889 threads_ah->obj_at_put(i, h());
3890 }
3891
3892 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3893 JVM_END
3894
3895
3896 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3897 // Return StackTraceElement[][], each element is the stack trace of a thread in
3898 // the corresponding entry in the given threads array
3899 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3900 JVMWrapper("JVM_DumpThreads");
3901 JvmtiVMObjectAllocEventCollector oam;
3902
3903 // Check if threads is null
3904 if (threads == NULL) {
3905 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3906 }
3907
3908 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3909 objArrayHandle ah(THREAD, a);
3910 int num_threads = ah->length();
3911 // check if threads is non-empty array
3912 if (num_threads == 0) {
3913 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3914 }
3915
3916 // check if threads is not an array of objects of Thread class
3917 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3918 if (k != SystemDictionary::Thread_klass()) {
3919 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3920 }
3921
3922 ResourceMark rm(THREAD);
3923
3924 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3925 for (int i = 0; i < num_threads; i++) {
3926 oop thread_obj = ah->obj_at(i);
3927 instanceHandle h(THREAD, (instanceOop) thread_obj);
3928 thread_handle_array->append(h);
3929 }
3930
3931 // The JavaThread references in thread_handle_array are validated
3932 // in VM_ThreadDump::doit().
3933 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3934 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3935
3936 JVM_END
3937
3938 // JVM monitoring and management support
3939 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3940 return Management::get_jmm_interface(version);
3941 JVM_END
3942
3943 // com.sun.tools.attach.VirtualMachine agent properties support
3944 //
3945 // Initialize the agent properties with the properties maintained in the VM
3946 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3947 JVMWrapper("JVM_InitAgentProperties");
3948 ResourceMark rm;
3949
3950 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3951
3952 PUTPROP(props, "sun.java.command", Arguments::java_command());
3953 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3954 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3955 return properties;
3956 JVM_END
3957
3958 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3959 {
3960 JVMWrapper("JVM_GetEnclosingMethodInfo");
3961 JvmtiVMObjectAllocEventCollector oam;
3962
3963 if (ofClass == NULL) {
3964 return NULL;
3965 }
3966 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3967 // Special handling for primitive objects
3968 if (java_lang_Class::is_primitive(mirror())) {
3969 return NULL;
3970 }
3971 Klass* k = java_lang_Class::as_Klass(mirror());
3972 if (!k->is_instance_klass()) {
3973 return NULL;
3974 }
3975 InstanceKlass* ik = InstanceKlass::cast(k);
3976 int encl_method_class_idx = ik->enclosing_method_class_index();
3977 if (encl_method_class_idx == 0) {
3978 return NULL;
3979 }
3980 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3981 objArrayHandle dest(THREAD, dest_o);
3982 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3983 dest->obj_at_put(0, enc_k->java_mirror());
3984 int encl_method_method_idx = ik->enclosing_method_method_index();
3985 if (encl_method_method_idx != 0) {
3986 Symbol* sym = ik->constants()->symbol_at(
3987 extract_low_short_from_int(
3988 ik->constants()->name_and_type_at(encl_method_method_idx)));
3989 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3990 dest->obj_at_put(1, str());
3991 sym = ik->constants()->symbol_at(
3992 extract_high_short_from_int(
3993 ik->constants()->name_and_type_at(encl_method_method_idx)));
3994 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3995 dest->obj_at_put(2, str());
3996 }
3997 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3998 }
3999 JVM_END
4000
4001 // Returns an array of java.lang.String objects containing the input arguments to the VM.
4002 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
4003 ResourceMark rm(THREAD);
4004
4005 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
4006 return NULL;
4007 }
4008
4009 char** vm_flags = Arguments::jvm_flags_array();
4010 char** vm_args = Arguments::jvm_args_array();
4011 int num_flags = Arguments::num_jvm_flags();
4012 int num_args = Arguments::num_jvm_args();
4013
4014 InstanceKlass* ik = SystemDictionary::String_klass();
4015 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
4016 objArrayHandle result_h(THREAD, r);
4017
4018 int index = 0;
4019 for (int j = 0; j < num_flags; j++, index++) {
4020 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
4021 result_h->obj_at_put(index, h());
4022 }
4023 for (int i = 0; i < num_args; i++, index++) {
4024 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
4025 result_h->obj_at_put(index, h());
4026 }
4027 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
4028 JVM_END
4029
4030 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
4031 return os::get_signal_number(name);
4032 JVM_END