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 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1308 // There are no signers for primitive types
1309 return NULL;
1310 }
1311
1312 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1313
1314 // If there are no signers set in the class, or if the class
1315 // is an array, return NULL.
1316 if (signers == NULL) return NULL;
1317
1318 // copy of the signers array
1319 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1320 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1321 for (int index = 0; index < signers->length(); index++) {
1322 signers_copy->obj_at_put(index, signers->obj_at(index));
1323 }
1324
1325 // return the copy
1326 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1327 JVM_END
1328
1329
1330 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1331 JVMWrapper("JVM_SetClassSigners");
1332 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1333 // This call is ignored for primitive types and arrays.
1334 // Signers are only set once, ClassLoader.java, and thus shouldn't
1335 // be called with an array. Only the bootstrap loader creates arrays.
1336 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1337 if (k->is_instance_klass()) {
1338 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1339 }
1340 }
1341 JVM_END
1342
1343
1344 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1345 JVMWrapper("JVM_GetProtectionDomain");
1346 if (JNIHandles::resolve(cls) == NULL) {
1347 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1348 }
1349
1350 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1351 // Primitive types does not have a protection domain.
1352 return NULL;
1353 }
1354
1355 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1356 return (jobject) JNIHandles::make_local(THREAD, pd);
1357 JVM_END
1358
1359
1360 // Returns the inherited_access_control_context field of the running thread.
1361 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1362 JVMWrapper("JVM_GetInheritedAccessControlContext");
1363 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1364 return JNIHandles::make_local(THREAD, result);
1365 JVM_END
1366
1367 class RegisterArrayForGC {
1368 private:
1369 JavaThread *_thread;
1370 public:
1371 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1372 _thread = thread;
1373 _thread->register_array_for_gc(array);
1374 }
1375
1376 ~RegisterArrayForGC() {
1377 _thread->register_array_for_gc(NULL);
1378 }
1379 };
1380
1381
1382 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1383 JVMWrapper("JVM_GetStackAccessControlContext");
1384 if (!UsePrivilegedStack) return NULL;
1385
1386 ResourceMark rm(THREAD);
1387 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1388 JvmtiVMObjectAllocEventCollector oam;
1389
1390 // count the protection domains on the execution stack. We collapse
1391 // duplicate consecutive protection domains into a single one, as
1392 // well as stopping when we hit a privileged frame.
1393
1394 oop previous_protection_domain = NULL;
1395 Handle privileged_context(thread, NULL);
1396 bool is_privileged = false;
1397 oop protection_domain = NULL;
1398
1399 // Iterate through Java frames
1400 vframeStream vfst(thread);
1401 for(; !vfst.at_end(); vfst.next()) {
1402 // get method of frame
1403 Method* method = vfst.method();
1404
1405 // stop at the first privileged frame
1406 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1407 method->name() == vmSymbols::executePrivileged_name())
1408 {
1409 // this frame is privileged
1410 is_privileged = true;
1411
1412 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1413
1414 StackValueCollection* locals = priv->locals();
1415 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1416 StackValue* clr_sv = locals->at(2); // Class<?> caller
1417 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1418 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1419 privileged_context = ctx_sv->get_obj();
1420 Handle caller = clr_sv->get_obj();
1421
1422 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1423 protection_domain = caller_klass->protection_domain();
1424 } else {
1425 protection_domain = method->method_holder()->protection_domain();
1426 }
1427
1428 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1429 local_array->push(protection_domain);
1430 previous_protection_domain = protection_domain;
1431 }
1432
1433 if (is_privileged) break;
1434 }
1435
1436
1437 // either all the domains on the stack were system domains, or
1438 // we had a privileged system domain
1439 if (local_array->is_empty()) {
1440 if (is_privileged && privileged_context.is_null()) return NULL;
1441
1442 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1443 return JNIHandles::make_local(THREAD, result);
1444 }
1445
1446 // the resource area must be registered in case of a gc
1447 RegisterArrayForGC ragc(thread, local_array);
1448 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1449 local_array->length(), CHECK_NULL);
1450 objArrayHandle h_context(thread, context);
1451 for (int index = 0; index < local_array->length(); index++) {
1452 h_context->obj_at_put(index, local_array->at(index));
1453 }
1454
1455 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1456
1457 return JNIHandles::make_local(THREAD, result);
1458 JVM_END
1459
1460
1461 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1462 JVMWrapper("JVM_IsArrayClass");
1463 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1464 return (k != NULL) && k->is_array_klass() ? true : false;
1465 JVM_END
1466
1467
1468 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1469 JVMWrapper("JVM_IsPrimitiveClass");
1470 oop mirror = JNIHandles::resolve_non_null(cls);
1471 return (jboolean) java_lang_Class::is_primitive(mirror);
1472 JVM_END
1473
1474
1475 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1476 JVMWrapper("JVM_GetClassModifiers");
1477 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1478 // Primitive type
1479 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1480 }
1481
1482 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1483 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1484 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1485 return k->modifier_flags();
1486 JVM_END
1487
1488
1489 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1490
1491 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1492 JvmtiVMObjectAllocEventCollector oam;
1493 // ofClass is a reference to a java_lang_Class object. The mirror object
1494 // of an InstanceKlass
1495
1496 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1497 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1498 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1499 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1500 }
1501
1502 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1503 InnerClassesIterator iter(k);
1504
1505 if (iter.length() == 0) {
1506 // Neither an inner nor outer class
1507 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1508 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1509 }
1510
1511 // find inner class info
1512 constantPoolHandle cp(thread, k->constants());
1513 int length = iter.length();
1514
1515 // Allocate temp. result array
1516 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1517 objArrayHandle result (THREAD, r);
1518 int members = 0;
1519
1520 for (; !iter.done(); iter.next()) {
1521 int ioff = iter.inner_class_info_index();
1522 int ooff = iter.outer_class_info_index();
1523
1524 if (ioff != 0 && ooff != 0) {
1525 // Check to see if the name matches the class we're looking for
1526 // before attempting to find the class.
1527 if (cp->klass_name_at_matches(k, ooff)) {
1528 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1529 if (outer_klass == k) {
1530 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1531 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1532
1533 // Throws an exception if outer klass has not declared k as
1534 // an inner klass
1535 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1536
1537 result->obj_at_put(members, inner_klass->java_mirror());
1538 members++;
1539 }
1540 }
1541 }
1542 }
1543
1544 if (members != length) {
1545 // Return array of right length
1546 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1547 for(int i = 0; i < members; i++) {
1548 res->obj_at_put(i, result->obj_at(i));
1549 }
1550 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1551 }
1552
1553 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1554 JVM_END
1555
1556
1557 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1558 {
1559 // ofClass is a reference to a java_lang_Class object.
1560 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1561 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1562 return NULL;
1563 }
1564
1565 bool inner_is_member = false;
1566 Klass* outer_klass
1567 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1568 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1569 if (outer_klass == NULL) return NULL; // already a top-level class
1570 if (!inner_is_member) return NULL; // a hidden or unsafe anonymous class (inside a method)
1571 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1572 }
1573 JVM_END
1574
1575 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1576 {
1577 oop mirror = JNIHandles::resolve_non_null(cls);
1578 if (java_lang_Class::is_primitive(mirror) ||
1579 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1580 return NULL;
1581 }
1582 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1583 int ooff = 0, noff = 0;
1584 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1585 if (noff != 0) {
1586 constantPoolHandle i_cp(thread, k->constants());
1587 Symbol* name = i_cp->symbol_at(noff);
1588 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1589 return (jstring) JNIHandles::make_local(THREAD, str());
1590 }
1591 }
1592 return NULL;
1593 }
1594 JVM_END
1595
1596 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1597 assert (cls != NULL, "illegal class");
1598 JVMWrapper("JVM_GetClassSignature");
1599 JvmtiVMObjectAllocEventCollector oam;
1600 ResourceMark rm(THREAD);
1601 // Return null for arrays and primatives
1602 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1603 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1604 if (k->is_instance_klass()) {
1605 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1606 if (sym == NULL) return NULL;
1607 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1608 return (jstring) JNIHandles::make_local(THREAD, str());
1609 }
1610 }
1611 return NULL;
1612 JVM_END
1613
1614
1615 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1616 assert (cls != NULL, "illegal class");
1617 JVMWrapper("JVM_GetClassAnnotations");
1618
1619 // Return null for arrays and primitives
1620 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1621 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1622 if (k->is_instance_klass()) {
1623 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1624 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1625 }
1626 }
1627 return NULL;
1628 JVM_END
1629
1630
1631 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1632 // some of this code was adapted from from jni_FromReflectedField
1633
1634 oop reflected = JNIHandles::resolve_non_null(field);
1635 oop mirror = java_lang_reflect_Field::clazz(reflected);
1636 Klass* k = java_lang_Class::as_Klass(mirror);
1637 int slot = java_lang_reflect_Field::slot(reflected);
1638 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1639
1640 InstanceKlass* ik = InstanceKlass::cast(k);
1641 intptr_t offset = ik->field_offset(slot);
1642
1643 if (modifiers & JVM_ACC_STATIC) {
1644 // for static fields we only look in the current class
1645 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1646 assert(false, "cannot find static field");
1647 return false;
1648 }
1649 } else {
1650 // for instance fields we start with the current class and work
1651 // our way up through the superclass chain
1652 if (!ik->find_field_from_offset(offset, false, &fd)) {
1653 assert(false, "cannot find instance field");
1654 return false;
1655 }
1656 }
1657 return true;
1658 }
1659
1660 static Method* jvm_get_method_common(jobject method) {
1661 // some of this code was adapted from from jni_FromReflectedMethod
1662
1663 oop reflected = JNIHandles::resolve_non_null(method);
1664 oop mirror = NULL;
1665 int slot = 0;
1666
1667 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1668 mirror = java_lang_reflect_Constructor::clazz(reflected);
1669 slot = java_lang_reflect_Constructor::slot(reflected);
1670 } else {
1671 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1672 "wrong type");
1673 mirror = java_lang_reflect_Method::clazz(reflected);
1674 slot = java_lang_reflect_Method::slot(reflected);
1675 }
1676 Klass* k = java_lang_Class::as_Klass(mirror);
1677
1678 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1679 assert(m != NULL, "cannot find method");
1680 return m; // caller has to deal with NULL in product mode
1681 }
1682
1683 /* Type use annotations support (JDK 1.8) */
1684
1685 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1686 assert (cls != NULL, "illegal class");
1687 JVMWrapper("JVM_GetClassTypeAnnotations");
1688 ResourceMark rm(THREAD);
1689 // Return null for arrays and primitives
1690 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1691 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1692 if (k->is_instance_klass()) {
1693 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1694 if (type_annotations != NULL) {
1695 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1696 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1697 }
1698 }
1699 }
1700 return NULL;
1701 JVM_END
1702
1703 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1704 assert (method != NULL, "illegal method");
1705 JVMWrapper("JVM_GetMethodTypeAnnotations");
1706
1707 // method is a handle to a java.lang.reflect.Method object
1708 Method* m = jvm_get_method_common(method);
1709 if (m == NULL) {
1710 return NULL;
1711 }
1712
1713 AnnotationArray* type_annotations = m->type_annotations();
1714 if (type_annotations != NULL) {
1715 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1716 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1717 }
1718
1719 return NULL;
1720 JVM_END
1721
1722 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1723 assert (field != NULL, "illegal field");
1724 JVMWrapper("JVM_GetFieldTypeAnnotations");
1725
1726 fieldDescriptor fd;
1727 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1728 if (!gotFd) {
1729 return NULL;
1730 }
1731
1732 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1733 JVM_END
1734
1735 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1736 if (!cp->is_within_bounds(index)) {
1737 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1738 }
1739 }
1740
1741 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1742 {
1743 JVMWrapper("JVM_GetMethodParameters");
1744 // method is a handle to a java.lang.reflect.Method object
1745 Method* method_ptr = jvm_get_method_common(method);
1746 methodHandle mh (THREAD, method_ptr);
1747 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1748 const int num_params = mh->method_parameters_length();
1749
1750 if (num_params < 0) {
1751 // A -1 return value from method_parameters_length means there is no
1752 // parameter data. Return null to indicate this to the reflection
1753 // API.
1754 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1755 return (jobjectArray)NULL;
1756 } else {
1757 // Otherwise, we return something up to reflection, even if it is
1758 // a zero-length array. Why? Because in some cases this can
1759 // trigger a MalformedParametersException.
1760
1761 // make sure all the symbols are properly formatted
1762 for (int i = 0; i < num_params; i++) {
1763 MethodParametersElement* params = mh->method_parameters_start();
1764 int index = params[i].name_cp_index;
1765 constantPoolHandle cp(THREAD, mh->constants());
1766 bounds_check(cp, index, CHECK_NULL);
1767
1768 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1769 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1770 "Wrong type at constant pool index");
1771 }
1772
1773 }
1774
1775 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1776 objArrayHandle result (THREAD, result_oop);
1777
1778 for (int i = 0; i < num_params; i++) {
1779 MethodParametersElement* params = mh->method_parameters_start();
1780 // For a 0 index, give a NULL symbol
1781 Symbol* sym = 0 != params[i].name_cp_index ?
1782 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1783 int flags = params[i].flags;
1784 oop param = Reflection::new_parameter(reflected_method, i, sym,
1785 flags, CHECK_NULL);
1786 result->obj_at_put(i, param);
1787 }
1788 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1789 }
1790 }
1791 JVM_END
1792
1793 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1794
1795 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1796 {
1797 JVMWrapper("JVM_GetClassDeclaredFields");
1798 JvmtiVMObjectAllocEventCollector oam;
1799
1800 // Exclude primitive types and array types
1801 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1802 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1803 // Return empty array
1804 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1805 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1806 }
1807
1808 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1809 constantPoolHandle cp(THREAD, k->constants());
1810
1811 // Ensure class is linked
1812 k->link_class(CHECK_NULL);
1813
1814 // Allocate result
1815 int num_fields;
1816
1817 if (publicOnly) {
1818 num_fields = 0;
1819 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1820 if (fs.access_flags().is_public()) ++num_fields;
1821 }
1822 } else {
1823 num_fields = k->java_fields_count();
1824 }
1825
1826 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1827 objArrayHandle result (THREAD, r);
1828
1829 int out_idx = 0;
1830 fieldDescriptor fd;
1831 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1832 if (!publicOnly || fs.access_flags().is_public()) {
1833 fd.reinitialize(k, fs.index());
1834 oop field = Reflection::new_field(&fd, CHECK_NULL);
1835 result->obj_at_put(out_idx, field);
1836 ++out_idx;
1837 }
1838 }
1839 assert(out_idx == num_fields, "just checking");
1840 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1841 }
1842 JVM_END
1843
1844 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1845 {
1846 JVMWrapper("JVM_IsRecord");
1847 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1848 if (k != NULL && k->is_instance_klass()) {
1849 InstanceKlass* ik = InstanceKlass::cast(k);
1850 return ik->is_record();
1851 } else {
1852 return false;
1853 }
1854 }
1855 JVM_END
1856
1857 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1858 {
1859 JVMWrapper("JVM_GetRecordComponents");
1860 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1861 assert(c->is_instance_klass(), "must be");
1862 InstanceKlass* ik = InstanceKlass::cast(c);
1863
1864 if (ik->is_record()) {
1865 Array<RecordComponent*>* components = ik->record_components();
1866 assert(components != NULL, "components should not be NULL");
1867 {
1868 JvmtiVMObjectAllocEventCollector oam;
1869 constantPoolHandle cp(THREAD, ik->constants());
1870 int length = components->length();
1871 assert(length >= 0, "unexpected record_components length");
1872 objArrayOop record_components =
1873 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL);
1874 objArrayHandle components_h (THREAD, record_components);
1875
1876 for (int x = 0; x < length; x++) {
1877 RecordComponent* component = components->at(x);
1878 assert(component != NULL, "unexpected NULL record component");
1879 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1880 components_h->obj_at_put(x, component_oop);
1881 }
1882 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1883 }
1884 }
1885
1886 // Return empty array if ofClass is not a record.
1887 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL);
1888 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1889 }
1890 JVM_END
1891
1892 static bool select_method(const methodHandle& method, bool want_constructor) {
1893 if (want_constructor) {
1894 return (method->is_initializer() && !method->is_static());
1895 } else {
1896 return (!method->is_initializer() && !method->is_overpass());
1897 }
1898 }
1899
1900 static jobjectArray get_class_declared_methods_helper(
1901 JNIEnv *env,
1902 jclass ofClass, jboolean publicOnly,
1903 bool want_constructor,
1904 Klass* klass, TRAPS) {
1905
1906 JvmtiVMObjectAllocEventCollector oam;
1907
1908 // Exclude primitive types and array types
1909 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1910 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1911 // Return empty array
1912 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1913 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1914 }
1915
1916 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1917
1918 // Ensure class is linked
1919 k->link_class(CHECK_NULL);
1920
1921 Array<Method*>* methods = k->methods();
1922 int methods_length = methods->length();
1923
1924 // Save original method_idnum in case of redefinition, which can change
1925 // the idnum of obsolete methods. The new method will have the same idnum
1926 // but if we refresh the methods array, the counts will be wrong.
1927 ResourceMark rm(THREAD);
1928 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1929 int num_methods = 0;
1930
1931 for (int i = 0; i < methods_length; i++) {
1932 methodHandle method(THREAD, methods->at(i));
1933 if (select_method(method, want_constructor)) {
1934 if (!publicOnly || method->is_public()) {
1935 idnums->push(method->method_idnum());
1936 ++num_methods;
1937 }
1938 }
1939 }
1940
1941 // Allocate result
1942 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1943 objArrayHandle result (THREAD, r);
1944
1945 // Now just put the methods that we selected above, but go by their idnum
1946 // in case of redefinition. The methods can be redefined at any safepoint,
1947 // so above when allocating the oop array and below when creating reflect
1948 // objects.
1949 for (int i = 0; i < num_methods; i++) {
1950 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1951 if (method.is_null()) {
1952 // Method may have been deleted and seems this API can handle null
1953 // Otherwise should probably put a method that throws NSME
1954 result->obj_at_put(i, NULL);
1955 } else {
1956 oop m;
1957 if (want_constructor) {
1958 m = Reflection::new_constructor(method, CHECK_NULL);
1959 } else {
1960 m = Reflection::new_method(method, false, CHECK_NULL);
1961 }
1962 result->obj_at_put(i, m);
1963 }
1964 }
1965
1966 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1967 }
1968
1969 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1970 {
1971 JVMWrapper("JVM_GetClassDeclaredMethods");
1972 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1973 /*want_constructor*/ false,
1974 SystemDictionary::reflect_Method_klass(), THREAD);
1975 }
1976 JVM_END
1977
1978 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1979 {
1980 JVMWrapper("JVM_GetClassDeclaredConstructors");
1981 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1982 /*want_constructor*/ true,
1983 SystemDictionary::reflect_Constructor_klass(), THREAD);
1984 }
1985 JVM_END
1986
1987 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1988 {
1989 JVMWrapper("JVM_GetClassAccessFlags");
1990 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1991 // Primitive type
1992 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1993 }
1994
1995 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1996 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1997 }
1998 JVM_END
1999
2000 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
2001 {
2002 JVMWrapper("JVM_AreNestMates");
2003 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2004 assert(c->is_instance_klass(), "must be");
2005 InstanceKlass* ck = InstanceKlass::cast(c);
2006 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2007 assert(m->is_instance_klass(), "must be");
2008 InstanceKlass* mk = InstanceKlass::cast(m);
2009 return ck->has_nestmate_access_to(mk, THREAD);
2010 }
2011 JVM_END
2012
2013 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2014 {
2015 // current is not a primitive or array class
2016 JVMWrapper("JVM_GetNestHost");
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 InstanceKlass* host = ck->nest_host(THREAD);
2021 return (jclass) (host == NULL ? NULL :
2022 JNIHandles::make_local(THREAD, host->java_mirror()));
2023 }
2024 JVM_END
2025
2026 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2027 {
2028 // current is not a primitive or array class
2029 JVMWrapper("JVM_GetNestMembers");
2030 ResourceMark rm(THREAD);
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
2036 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2037 ck->external_name(), host->external_name());
2038 {
2039 JvmtiVMObjectAllocEventCollector oam;
2040 Array<u2>* members = host->nest_members();
2041 int length = members == NULL ? 0 : members->length();
2042
2043 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2044
2045 // nest host is first in the array so make it one bigger
2046 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2047 length + 1, CHECK_NULL);
2048 objArrayHandle result(THREAD, r);
2049 result->obj_at_put(0, host->java_mirror());
2050 if (length != 0) {
2051 int count = 0;
2052 for (int i = 0; i < length; i++) {
2053 int cp_index = members->at(i);
2054 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2055 if (HAS_PENDING_EXCEPTION) {
2056 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) {
2057 return NULL; // propagate VMEs
2058 }
2059 if (log_is_enabled(Trace, class, nestmates)) {
2060 stringStream ss;
2061 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2062 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2063 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2064 log_trace(class, nestmates)("%s", ss.as_string());
2065 }
2066 CLEAR_PENDING_EXCEPTION;
2067 continue;
2068 }
2069 if (k->is_instance_klass()) {
2070 InstanceKlass* ik = InstanceKlass::cast(k);
2071 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2072 if (nest_host_k == host) {
2073 result->obj_at_put(count+1, k->java_mirror());
2074 count++;
2075 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2076 } else {
2077 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2078 ik->external_name(), nest_host_k->external_name());
2079 }
2080 } else {
2081 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2082 k->external_name());
2083 }
2084 }
2085 if (count < length) {
2086 // we had invalid entries so we need to compact the array
2087 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2088 length + 1, count + 1);
2089
2090 objArrayOop r2 = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2091 count + 1, CHECK_NULL);
2092 objArrayHandle result2(THREAD, r2);
2093 for (int i = 0; i < count + 1; i++) {
2094 result2->obj_at_put(i, result->obj_at(i));
2095 }
2096 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2097 }
2098 }
2099 else {
2100 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2101 }
2102 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2103 }
2104 }
2105 JVM_END
2106
2107 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2108 {
2109 JVMWrapper("JVM_GetPermittedSubclasses");
2110 assert(!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(current)), "should not be");
2111 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2112 assert(c->is_instance_klass(), "must be");
2113 InstanceKlass* ik = InstanceKlass::cast(c);
2114 {
2115 JvmtiVMObjectAllocEventCollector oam;
2116 Array<u2>* subclasses = ik->permitted_subclasses();
2117 int length = subclasses == NULL ? 0 : subclasses->length();
2118 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
2119 length, CHECK_NULL);
2120 objArrayHandle result(THREAD, r);
2121 for (int i = 0; i < length; i++) {
2122 int cp_index = subclasses->at(i);
2123 // This returns <package-name>/<class-name>.
2124 Symbol* klass_name = ik->constants()->klass_name_at(cp_index);
2125 assert(klass_name != NULL, "Unexpected null klass_name");
2126 Handle perm_subtype_h = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2127 result->obj_at_put(i, perm_subtype_h());
2128 }
2129 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2130 }
2131 }
2132 JVM_END
2133
2134 // Constant pool access //////////////////////////////////////////////////////////
2135
2136 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2137 {
2138 JVMWrapper("JVM_GetClassConstantPool");
2139 JvmtiVMObjectAllocEventCollector oam;
2140
2141 // Return null for primitives and arrays
2142 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2143 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2144 if (k->is_instance_klass()) {
2145 InstanceKlass* k_h = InstanceKlass::cast(k);
2146 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2147 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2148 return JNIHandles::make_local(THREAD, jcp());
2149 }
2150 }
2151 return NULL;
2152 }
2153 JVM_END
2154
2155
2156 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2157 {
2158 JVMWrapper("JVM_ConstantPoolGetSize");
2159 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2160 return cp->length();
2161 }
2162 JVM_END
2163
2164
2165 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2166 {
2167 JVMWrapper("JVM_ConstantPoolGetClassAt");
2168 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2169 bounds_check(cp, index, CHECK_NULL);
2170 constantTag tag = cp->tag_at(index);
2171 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2172 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2173 }
2174 Klass* k = cp->klass_at(index, CHECK_NULL);
2175 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2176 }
2177 JVM_END
2178
2179 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2180 {
2181 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2182 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2183 bounds_check(cp, index, CHECK_NULL);
2184 constantTag tag = cp->tag_at(index);
2185 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2186 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2187 }
2188 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2189 if (k == NULL) return NULL;
2190 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2191 }
2192 JVM_END
2193
2194 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2195 constantTag tag = cp->tag_at(index);
2196 if (!tag.is_method() && !tag.is_interface_method()) {
2197 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2198 }
2199 int klass_ref = cp->uncached_klass_ref_index_at(index);
2200 Klass* k_o;
2201 if (force_resolution) {
2202 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2203 } else {
2204 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2205 if (k_o == NULL) return NULL;
2206 }
2207 InstanceKlass* k = InstanceKlass::cast(k_o);
2208 Symbol* name = cp->uncached_name_ref_at(index);
2209 Symbol* sig = cp->uncached_signature_ref_at(index);
2210 methodHandle m (THREAD, k->find_method(name, sig));
2211 if (m.is_null()) {
2212 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2213 }
2214 oop method;
2215 if (!m->is_initializer() || m->is_static()) {
2216 method = Reflection::new_method(m, true, CHECK_NULL);
2217 } else {
2218 method = Reflection::new_constructor(m, CHECK_NULL);
2219 }
2220 return JNIHandles::make_local(THREAD, method);
2221 }
2222
2223 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2224 {
2225 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2226 JvmtiVMObjectAllocEventCollector oam;
2227 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2228 bounds_check(cp, index, CHECK_NULL);
2229 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2230 return res;
2231 }
2232 JVM_END
2233
2234 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2235 {
2236 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2237 JvmtiVMObjectAllocEventCollector oam;
2238 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2239 bounds_check(cp, index, CHECK_NULL);
2240 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2241 return res;
2242 }
2243 JVM_END
2244
2245 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2246 constantTag tag = cp->tag_at(index);
2247 if (!tag.is_field()) {
2248 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2249 }
2250 int klass_ref = cp->uncached_klass_ref_index_at(index);
2251 Klass* k_o;
2252 if (force_resolution) {
2253 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2254 } else {
2255 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2256 if (k_o == NULL) return NULL;
2257 }
2258 InstanceKlass* k = InstanceKlass::cast(k_o);
2259 Symbol* name = cp->uncached_name_ref_at(index);
2260 Symbol* sig = cp->uncached_signature_ref_at(index);
2261 fieldDescriptor fd;
2262 Klass* target_klass = k->find_field(name, sig, &fd);
2263 if (target_klass == NULL) {
2264 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2265 }
2266 oop field = Reflection::new_field(&fd, CHECK_NULL);
2267 return JNIHandles::make_local(THREAD, field);
2268 }
2269
2270 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2271 {
2272 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2273 JvmtiVMObjectAllocEventCollector oam;
2274 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2275 bounds_check(cp, index, CHECK_NULL);
2276 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2277 return res;
2278 }
2279 JVM_END
2280
2281 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2282 {
2283 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2284 JvmtiVMObjectAllocEventCollector oam;
2285 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2286 bounds_check(cp, index, CHECK_NULL);
2287 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2288 return res;
2289 }
2290 JVM_END
2291
2292 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2293 {
2294 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2295 JvmtiVMObjectAllocEventCollector oam;
2296 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2297 bounds_check(cp, index, CHECK_NULL);
2298 constantTag tag = cp->tag_at(index);
2299 if (!tag.is_field_or_method()) {
2300 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2301 }
2302 int klass_ref = cp->uncached_klass_ref_index_at(index);
2303 Symbol* klass_name = cp->klass_name_at(klass_ref);
2304 Symbol* member_name = cp->uncached_name_ref_at(index);
2305 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2306 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2307 objArrayHandle dest(THREAD, dest_o);
2308 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2309 dest->obj_at_put(0, str());
2310 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2311 dest->obj_at_put(1, str());
2312 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2313 dest->obj_at_put(2, str());
2314 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2315 }
2316 JVM_END
2317
2318 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2319 {
2320 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2321 JvmtiVMObjectAllocEventCollector oam;
2322 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2323 bounds_check(cp, index, CHECK_0);
2324 constantTag tag = cp->tag_at(index);
2325 if (!tag.is_field_or_method()) {
2326 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2327 }
2328 return (jint) cp->uncached_klass_ref_index_at(index);
2329 }
2330 JVM_END
2331
2332 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2333 {
2334 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2335 JvmtiVMObjectAllocEventCollector oam;
2336 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2337 bounds_check(cp, index, CHECK_0);
2338 constantTag tag = cp->tag_at(index);
2339 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2340 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2341 }
2342 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2343 }
2344 JVM_END
2345
2346 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2347 {
2348 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2349 JvmtiVMObjectAllocEventCollector oam;
2350 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2351 bounds_check(cp, index, CHECK_NULL);
2352 constantTag tag = cp->tag_at(index);
2353 if (!tag.is_name_and_type()) {
2354 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2355 }
2356 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2357 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2358 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2359 objArrayHandle dest(THREAD, dest_o);
2360 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2361 dest->obj_at_put(0, str());
2362 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2363 dest->obj_at_put(1, str());
2364 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2365 }
2366 JVM_END
2367
2368 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2369 {
2370 JVMWrapper("JVM_ConstantPoolGetIntAt");
2371 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2372 bounds_check(cp, index, CHECK_0);
2373 constantTag tag = cp->tag_at(index);
2374 if (!tag.is_int()) {
2375 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2376 }
2377 return cp->int_at(index);
2378 }
2379 JVM_END
2380
2381 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2382 {
2383 JVMWrapper("JVM_ConstantPoolGetLongAt");
2384 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2385 bounds_check(cp, index, CHECK_(0L));
2386 constantTag tag = cp->tag_at(index);
2387 if (!tag.is_long()) {
2388 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2389 }
2390 return cp->long_at(index);
2391 }
2392 JVM_END
2393
2394 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2395 {
2396 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2397 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2398 bounds_check(cp, index, CHECK_(0.0f));
2399 constantTag tag = cp->tag_at(index);
2400 if (!tag.is_float()) {
2401 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2402 }
2403 return cp->float_at(index);
2404 }
2405 JVM_END
2406
2407 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2408 {
2409 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2410 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2411 bounds_check(cp, index, CHECK_(0.0));
2412 constantTag tag = cp->tag_at(index);
2413 if (!tag.is_double()) {
2414 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2415 }
2416 return cp->double_at(index);
2417 }
2418 JVM_END
2419
2420 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2421 {
2422 JVMWrapper("JVM_ConstantPoolGetStringAt");
2423 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2424 bounds_check(cp, index, CHECK_NULL);
2425 constantTag tag = cp->tag_at(index);
2426 if (!tag.is_string()) {
2427 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2428 }
2429 oop str = cp->string_at(index, CHECK_NULL);
2430 return (jstring) JNIHandles::make_local(THREAD, str);
2431 }
2432 JVM_END
2433
2434 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2435 {
2436 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2437 JvmtiVMObjectAllocEventCollector oam;
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_symbol()) {
2442 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2443 }
2444 Symbol* sym = cp->symbol_at(index);
2445 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2446 return (jstring) JNIHandles::make_local(THREAD, str());
2447 }
2448 JVM_END
2449
2450 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2451 {
2452 JVMWrapper("JVM_ConstantPoolGetTagAt");
2453 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2454 bounds_check(cp, index, CHECK_0);
2455 constantTag tag = cp->tag_at(index);
2456 jbyte result = tag.value();
2457 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2458 // they are changed to the corresponding tags from the JVM spec, so that java code in
2459 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2460 if (tag.is_klass_or_reference()) {
2461 result = JVM_CONSTANT_Class;
2462 } else if (tag.is_string_index()) {
2463 result = JVM_CONSTANT_String;
2464 } else if (tag.is_method_type_in_error()) {
2465 result = JVM_CONSTANT_MethodType;
2466 } else if (tag.is_method_handle_in_error()) {
2467 result = JVM_CONSTANT_MethodHandle;
2468 } else if (tag.is_dynamic_constant_in_error()) {
2469 result = JVM_CONSTANT_Dynamic;
2470 }
2471 return result;
2472 }
2473 JVM_END
2474
2475 // Assertion support. //////////////////////////////////////////////////////////
2476
2477 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2478 JVMWrapper("JVM_DesiredAssertionStatus");
2479 assert(cls != NULL, "bad class");
2480
2481 oop r = JNIHandles::resolve(cls);
2482 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2483 if (java_lang_Class::is_primitive(r)) return false;
2484
2485 Klass* k = java_lang_Class::as_Klass(r);
2486 assert(k->is_instance_klass(), "must be an instance klass");
2487 if (!k->is_instance_klass()) return false;
2488
2489 ResourceMark rm(THREAD);
2490 const char* name = k->name()->as_C_string();
2491 bool system_class = k->class_loader() == NULL;
2492 return JavaAssertions::enabled(name, system_class);
2493
2494 JVM_END
2495
2496
2497 // Return a new AssertionStatusDirectives object with the fields filled in with
2498 // command-line assertion arguments (i.e., -ea, -da).
2499 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2500 JVMWrapper("JVM_AssertionStatusDirectives");
2501 JvmtiVMObjectAllocEventCollector oam;
2502 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2503 return JNIHandles::make_local(THREAD, asd);
2504 JVM_END
2505
2506 // Verification ////////////////////////////////////////////////////////////////////////////////
2507
2508 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2509
2510 // RedefineClasses support: bug 6214132 caused verification to fail.
2511 // All functions from this section should call the jvmtiThreadSate function:
2512 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2513 // The function returns a Klass* of the _scratch_class if the verifier
2514 // was invoked in the middle of the class redefinition.
2515 // Otherwise it returns its argument value which is the _the_class Klass*.
2516 // Please, refer to the description in the jvmtiThreadSate.hpp.
2517
2518 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2519 JVMWrapper("JVM_GetClassNameUTF");
2520 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2521 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2522 return k->name()->as_utf8();
2523 JVM_END
2524
2525
2526 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2527 JVMWrapper("JVM_GetClassCPTypes");
2528 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2529 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2530 // types will have length zero if this is not an InstanceKlass
2531 // (length is determined by call to JVM_GetClassCPEntriesCount)
2532 if (k->is_instance_klass()) {
2533 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2534 for (int index = cp->length() - 1; index >= 0; index--) {
2535 constantTag tag = cp->tag_at(index);
2536 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2537 }
2538 }
2539 JVM_END
2540
2541
2542 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2543 JVMWrapper("JVM_GetClassCPEntriesCount");
2544 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2545 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2546 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2547 JVM_END
2548
2549
2550 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2551 JVMWrapper("JVM_GetClassFieldsCount");
2552 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2553 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2554 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2555 JVM_END
2556
2557
2558 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2559 JVMWrapper("JVM_GetClassMethodsCount");
2560 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2561 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2562 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2563 JVM_END
2564
2565
2566 // The following methods, used for the verifier, are never called with
2567 // array klasses, so a direct cast to InstanceKlass is safe.
2568 // Typically, these methods are called in a loop with bounds determined
2569 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2570 // zero for arrays.
2571 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2572 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2573 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2574 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2575 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2576 int length = method->checked_exceptions_length();
2577 if (length > 0) {
2578 CheckedExceptionElement* table= method->checked_exceptions_start();
2579 for (int i = 0; i < length; i++) {
2580 exceptions[i] = table[i].class_cp_index;
2581 }
2582 }
2583 JVM_END
2584
2585
2586 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2587 JVMWrapper("JVM_GetMethodIxExceptionsCount");
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 return method->checked_exceptions_length();
2592 JVM_END
2593
2594
2595 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2596 JVMWrapper("JVM_GetMethodIxByteCode");
2597 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2598 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2599 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2600 memcpy(code, method->code_base(), method->code_size());
2601 JVM_END
2602
2603
2604 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2605 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2606 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2607 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2608 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2609 return method->code_size();
2610 JVM_END
2611
2612
2613 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2614 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2615 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2616 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2617 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2618 ExceptionTable extable(method);
2619 entry->start_pc = extable.start_pc(entry_index);
2620 entry->end_pc = extable.end_pc(entry_index);
2621 entry->handler_pc = extable.handler_pc(entry_index);
2622 entry->catchType = extable.catch_type_index(entry_index);
2623 JVM_END
2624
2625
2626 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2627 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2628 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2629 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2630 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2631 return method->exception_table_length();
2632 JVM_END
2633
2634
2635 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2636 JVMWrapper("JVM_GetMethodIxModifiers");
2637 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2638 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2639 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2640 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2641 JVM_END
2642
2643
2644 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2645 JVMWrapper("JVM_GetFieldIxModifiers");
2646 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2647 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2648 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2649 JVM_END
2650
2651
2652 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2653 JVMWrapper("JVM_GetMethodIxLocalsCount");
2654 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2655 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2656 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2657 return method->max_locals();
2658 JVM_END
2659
2660
2661 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2662 JVMWrapper("JVM_GetMethodIxArgsSize");
2663 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2664 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2665 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2666 return method->size_of_parameters();
2667 JVM_END
2668
2669
2670 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2671 JVMWrapper("JVM_GetMethodIxMaxStack");
2672 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2673 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2674 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2675 return method->verifier_max_stack();
2676 JVM_END
2677
2678
2679 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2680 JVMWrapper("JVM_IsConstructorIx");
2681 ResourceMark rm(THREAD);
2682 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2683 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2684 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2685 return method->name() == vmSymbols::object_initializer_name();
2686 JVM_END
2687
2688
2689 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2690 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2691 ResourceMark rm(THREAD);
2692 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2693 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2694 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2695 return method->is_overpass();
2696 JVM_END
2697
2698 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2699 JVMWrapper("JVM_GetMethodIxIxUTF");
2700 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2701 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2702 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2703 return method->name()->as_utf8();
2704 JVM_END
2705
2706
2707 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2708 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2709 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2710 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2711 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2712 return method->signature()->as_utf8();
2713 JVM_END
2714
2715 /**
2716 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2717 * read entries in the constant pool. Since the old verifier always
2718 * works on a copy of the code, it will not see any rewriting that
2719 * may possibly occur in the middle of verification. So it is important
2720 * that nothing it calls tries to use the cpCache instead of the raw
2721 * constant pool, so we must use cp->uncached_x methods when appropriate.
2722 */
2723 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2724 JVMWrapper("JVM_GetCPFieldNameUTF");
2725 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2726 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2727 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2728 switch (cp->tag_at(cp_index).value()) {
2729 case JVM_CONSTANT_Fieldref:
2730 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2731 default:
2732 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2733 }
2734 ShouldNotReachHere();
2735 return NULL;
2736 JVM_END
2737
2738
2739 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2740 JVMWrapper("JVM_GetCPMethodNameUTF");
2741 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2742 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2743 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2744 switch (cp->tag_at(cp_index).value()) {
2745 case JVM_CONSTANT_InterfaceMethodref:
2746 case JVM_CONSTANT_Methodref:
2747 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2748 default:
2749 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2750 }
2751 ShouldNotReachHere();
2752 return NULL;
2753 JVM_END
2754
2755
2756 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2757 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2758 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2759 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2760 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2761 switch (cp->tag_at(cp_index).value()) {
2762 case JVM_CONSTANT_InterfaceMethodref:
2763 case JVM_CONSTANT_Methodref:
2764 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2765 default:
2766 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2767 }
2768 ShouldNotReachHere();
2769 return NULL;
2770 JVM_END
2771
2772
2773 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2774 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2775 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2776 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2777 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2778 switch (cp->tag_at(cp_index).value()) {
2779 case JVM_CONSTANT_Fieldref:
2780 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2781 default:
2782 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2783 }
2784 ShouldNotReachHere();
2785 return NULL;
2786 JVM_END
2787
2788
2789 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2790 JVMWrapper("JVM_GetCPClassNameUTF");
2791 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2792 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2793 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2794 Symbol* classname = cp->klass_name_at(cp_index);
2795 return classname->as_utf8();
2796 JVM_END
2797
2798
2799 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2800 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2801 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2802 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2803 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2804 switch (cp->tag_at(cp_index).value()) {
2805 case JVM_CONSTANT_Fieldref: {
2806 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2807 Symbol* classname = cp->klass_name_at(class_index);
2808 return classname->as_utf8();
2809 }
2810 default:
2811 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2812 }
2813 ShouldNotReachHere();
2814 return NULL;
2815 JVM_END
2816
2817
2818 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2819 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2820 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2821 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2822 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2823 switch (cp->tag_at(cp_index).value()) {
2824 case JVM_CONSTANT_Methodref:
2825 case JVM_CONSTANT_InterfaceMethodref: {
2826 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2827 Symbol* classname = cp->klass_name_at(class_index);
2828 return classname->as_utf8();
2829 }
2830 default:
2831 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2832 }
2833 ShouldNotReachHere();
2834 return NULL;
2835 JVM_END
2836
2837
2838 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2839 JVMWrapper("JVM_GetCPFieldModifiers");
2840 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2841 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2842 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2843 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2844 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2845 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2846 switch (cp->tag_at(cp_index).value()) {
2847 case JVM_CONSTANT_Fieldref: {
2848 Symbol* name = cp->uncached_name_ref_at(cp_index);
2849 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2850 InstanceKlass* ik = InstanceKlass::cast(k_called);
2851 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2852 if (fs.name() == name && fs.signature() == signature) {
2853 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2854 }
2855 }
2856 return -1;
2857 }
2858 default:
2859 fatal("JVM_GetCPFieldModifiers: illegal constant");
2860 }
2861 ShouldNotReachHere();
2862 return 0;
2863 JVM_END
2864
2865
2866 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2867 JVMWrapper("JVM_GetCPMethodModifiers");
2868 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2869 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2870 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2871 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2872 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2873 switch (cp->tag_at(cp_index).value()) {
2874 case JVM_CONSTANT_Methodref:
2875 case JVM_CONSTANT_InterfaceMethodref: {
2876 Symbol* name = cp->uncached_name_ref_at(cp_index);
2877 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2878 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2879 int methods_count = methods->length();
2880 for (int i = 0; i < methods_count; i++) {
2881 Method* method = methods->at(i);
2882 if (method->name() == name && method->signature() == signature) {
2883 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2884 }
2885 }
2886 return -1;
2887 }
2888 default:
2889 fatal("JVM_GetCPMethodModifiers: illegal constant");
2890 }
2891 ShouldNotReachHere();
2892 return 0;
2893 JVM_END
2894
2895
2896 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2897
2898 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2899 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2900 JVM_END
2901
2902
2903 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2904 JVMWrapper("JVM_IsSameClassPackage");
2905 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2906 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2907 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2908 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2909 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2910 JVM_END
2911
2912 // Printing support //////////////////////////////////////////////////
2913 extern "C" {
2914
2915 ATTRIBUTE_PRINTF(3, 0)
2916 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2917 // Reject count values that are negative signed values converted to
2918 // unsigned; see bug 4399518, 4417214
2919 if ((intptr_t)count <= 0) return -1;
2920
2921 int result = os::vsnprintf(str, count, fmt, args);
2922 if (result > 0 && (size_t)result >= count) {
2923 result = -1;
2924 }
2925
2926 return result;
2927 }
2928
2929 ATTRIBUTE_PRINTF(3, 4)
2930 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2931 va_list args;
2932 int len;
2933 va_start(args, fmt);
2934 len = jio_vsnprintf(str, count, fmt, args);
2935 va_end(args);
2936 return len;
2937 }
2938
2939 ATTRIBUTE_PRINTF(2, 3)
2940 int jio_fprintf(FILE* f, const char *fmt, ...) {
2941 int len;
2942 va_list args;
2943 va_start(args, fmt);
2944 len = jio_vfprintf(f, fmt, args);
2945 va_end(args);
2946 return len;
2947 }
2948
2949 ATTRIBUTE_PRINTF(2, 0)
2950 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2951 if (Arguments::vfprintf_hook() != NULL) {
2952 return Arguments::vfprintf_hook()(f, fmt, args);
2953 } else {
2954 return vfprintf(f, fmt, args);
2955 }
2956 }
2957
2958 ATTRIBUTE_PRINTF(1, 2)
2959 JNIEXPORT int jio_printf(const char *fmt, ...) {
2960 int len;
2961 va_list args;
2962 va_start(args, fmt);
2963 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2964 va_end(args);
2965 return len;
2966 }
2967
2968 // HotSpot specific jio method
2969 void jio_print(const char* s, size_t len) {
2970 // Try to make this function as atomic as possible.
2971 if (Arguments::vfprintf_hook() != NULL) {
2972 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2973 } else {
2974 // Make an unused local variable to avoid warning from gcc compiler.
2975 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2976 }
2977 }
2978
2979 } // Extern C
2980
2981 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2982
2983 // In most of the JVM thread support functions we need to access the
2984 // thread through a ThreadsListHandle to prevent it from exiting and
2985 // being reclaimed while we try to operate on it. The exceptions to this
2986 // rule are when operating on the current thread, or if the monitor of
2987 // the target java.lang.Thread is locked at the Java level - in both
2988 // cases the target cannot exit.
2989
2990 static void thread_entry(JavaThread* thread, TRAPS) {
2991 HandleMark hm(THREAD);
2992 Handle obj(THREAD, thread->threadObj());
2993 JavaValue result(T_VOID);
2994 JavaCalls::call_virtual(&result,
2995 obj,
2996 SystemDictionary::Thread_klass(),
2997 vmSymbols::run_method_name(),
2998 vmSymbols::void_method_signature(),
2999 THREAD);
3000 }
3001
3002
3003 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3004 JVMWrapper("JVM_StartThread");
3005 JavaThread *native_thread = NULL;
3006
3007 // We cannot hold the Threads_lock when we throw an exception,
3008 // due to rank ordering issues. Example: we might need to grab the
3009 // Heap_lock while we construct the exception.
3010 bool throw_illegal_thread_state = false;
3011
3012 // We must release the Threads_lock before we can post a jvmti event
3013 // in Thread::start.
3014 {
3015 // Ensure that the C++ Thread and OSThread structures aren't freed before
3016 // we operate.
3017 MutexLocker mu(Threads_lock);
3018
3019 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3020 // re-starting an already started thread, so we should usually find
3021 // that the JavaThread is null. However for a JNI attached thread
3022 // there is a small window between the Thread object being created
3023 // (with its JavaThread set) and the update to its threadStatus, so we
3024 // have to check for this
3025 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
3026 throw_illegal_thread_state = true;
3027 } else {
3028 // We could also check the stillborn flag to see if this thread was already stopped, but
3029 // for historical reasons we let the thread detect that itself when it starts running
3030
3031 jlong size =
3032 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3033 // Allocate the C++ Thread structure and create the native thread. The
3034 // stack size retrieved from java is 64-bit signed, but the constructor takes
3035 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3036 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3037 // - Avoid passing negative values which would result in really large stacks.
3038 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3039 size_t sz = size > 0 ? (size_t) size : 0;
3040 native_thread = new JavaThread(&thread_entry, sz);
3041
3042 // At this point it may be possible that no osthread was created for the
3043 // JavaThread due to lack of memory. Check for this situation and throw
3044 // an exception if necessary. Eventually we may want to change this so
3045 // that we only grab the lock if the thread was created successfully -
3046 // then we can also do this check and throw the exception in the
3047 // JavaThread constructor.
3048 if (native_thread->osthread() != NULL) {
3049 // Note: the current thread is not being used within "prepare".
3050 native_thread->prepare(jthread);
3051 }
3052 }
3053 }
3054
3055 if (throw_illegal_thread_state) {
3056 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3057 }
3058
3059 assert(native_thread != NULL, "Starting null thread?");
3060
3061 if (native_thread->osthread() == NULL) {
3062 // No one should hold a reference to the 'native_thread'.
3063 native_thread->smr_delete();
3064 if (JvmtiExport::should_post_resource_exhausted()) {
3065 JvmtiExport::post_resource_exhausted(
3066 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3067 os::native_thread_creation_failed_msg());
3068 }
3069 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3070 os::native_thread_creation_failed_msg());
3071 }
3072
3073 #if INCLUDE_JFR
3074 if (Jfr::is_recording() && EventThreadStart::is_enabled() &&
3075 EventThreadStart::is_stacktrace_enabled()) {
3076 JfrThreadLocal* tl = native_thread->jfr_thread_local();
3077 // skip Thread.start() and Thread.start0()
3078 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2));
3079 }
3080 #endif
3081
3082 Thread::start(native_thread);
3083
3084 JVM_END
3085
3086
3087 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3088 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
3089 // but is thought to be reliable and simple. In the case, where the receiver is the
3090 // same thread as the sender, no VM_Operation is needed.
3091 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3092 JVMWrapper("JVM_StopThread");
3093
3094 // A nested ThreadsListHandle will grab the Threads_lock so create
3095 // tlh before we resolve throwable.
3096 ThreadsListHandle tlh(thread);
3097 oop java_throwable = JNIHandles::resolve(throwable);
3098 if (java_throwable == NULL) {
3099 THROW(vmSymbols::java_lang_NullPointerException());
3100 }
3101 oop java_thread = NULL;
3102 JavaThread* receiver = NULL;
3103 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3104 Events::log_exception(thread,
3105 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3106 p2i(receiver), p2i(java_thread), p2i(throwable));
3107
3108 if (is_alive) {
3109 // jthread refers to a live JavaThread.
3110 if (thread == receiver) {
3111 // Exception is getting thrown at self so no VM_Operation needed.
3112 THROW_OOP(java_throwable);
3113 } else {
3114 // Use a VM_Operation to throw the exception.
3115 Thread::send_async_exception(java_thread, java_throwable);
3116 }
3117 } else {
3118 // Either:
3119 // - target thread has not been started before being stopped, or
3120 // - target thread already terminated
3121 // We could read the threadStatus to determine which case it is
3122 // but that is overkill as it doesn't matter. We must set the
3123 // stillborn flag for the first case, and if the thread has already
3124 // exited setting this flag has no effect.
3125 java_lang_Thread::set_stillborn(java_thread);
3126 }
3127 JVM_END
3128
3129
3130 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3131 JVMWrapper("JVM_IsThreadAlive");
3132
3133 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3134 return java_lang_Thread::is_alive(thread_oop);
3135 JVM_END
3136
3137
3138 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3139 JVMWrapper("JVM_SuspendThread");
3140
3141 ThreadsListHandle tlh(thread);
3142 JavaThread* receiver = NULL;
3143 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3144 if (is_alive) {
3145 // jthread refers to a live JavaThread.
3146 {
3147 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3148 if (receiver->is_external_suspend()) {
3149 // Don't allow nested external suspend requests. We can't return
3150 // an error from this interface so just ignore the problem.
3151 return;
3152 }
3153 if (receiver->is_exiting()) { // thread is in the process of exiting
3154 return;
3155 }
3156 receiver->set_external_suspend();
3157 }
3158
3159 // java_suspend() will catch threads in the process of exiting
3160 // and will ignore them.
3161 receiver->java_suspend();
3162
3163 // It would be nice to have the following assertion in all the
3164 // time, but it is possible for a racing resume request to have
3165 // resumed this thread right after we suspended it. Temporarily
3166 // enable this assertion if you are chasing a different kind of
3167 // bug.
3168 //
3169 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3170 // receiver->is_being_ext_suspended(), "thread is not suspended");
3171 }
3172 JVM_END
3173
3174
3175 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3176 JVMWrapper("JVM_ResumeThread");
3177
3178 ThreadsListHandle tlh(thread);
3179 JavaThread* receiver = NULL;
3180 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3181 if (is_alive) {
3182 // jthread refers to a live JavaThread.
3183
3184 // This is the original comment for this Threads_lock grab:
3185 // We need to *always* get the threads lock here, since this operation cannot be allowed during
3186 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3187 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3188 // looks at it.
3189 //
3190 // The above comment dates back to when we had both internal and
3191 // external suspend APIs that shared a common underlying mechanism.
3192 // External suspend is now entirely cooperative and doesn't share
3193 // anything with internal suspend. That said, there are some
3194 // assumptions in the VM that an external resume grabs the
3195 // Threads_lock. We can't drop the Threads_lock grab here until we
3196 // resolve the assumptions that exist elsewhere.
3197 //
3198 MutexLocker ml(Threads_lock);
3199 receiver->java_resume();
3200 }
3201 JVM_END
3202
3203
3204 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3205 JVMWrapper("JVM_SetThreadPriority");
3206
3207 ThreadsListHandle tlh(thread);
3208 oop java_thread = NULL;
3209 JavaThread* receiver = NULL;
3210 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3211 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3212
3213 if (is_alive) {
3214 // jthread refers to a live JavaThread.
3215 Thread::set_priority(receiver, (ThreadPriority)prio);
3216 }
3217 // Implied else: If the JavaThread hasn't started yet, then the
3218 // priority set in the java.lang.Thread object above will be pushed
3219 // down when it does start.
3220 JVM_END
3221
3222
3223 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3224 JVMWrapper("JVM_Yield");
3225 if (os::dont_yield()) return;
3226 HOTSPOT_THREAD_YIELD();
3227 os::naked_yield();
3228 JVM_END
3229
3230 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3231 assert(event != NULL, "invariant");
3232 assert(event->should_commit(), "invariant");
3233 event->set_time(millis);
3234 event->commit();
3235 }
3236
3237 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3238 JVMWrapper("JVM_Sleep");
3239
3240 if (millis < 0) {
3241 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3242 }
3243
3244 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3245 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3246 }
3247
3248 // Save current thread state and restore it at the end of this block.
3249 // And set new thread state to SLEEPING.
3250 JavaThreadSleepState jtss(thread);
3251
3252 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3253 EventThreadSleep event;
3254
3255 if (millis == 0) {
3256 os::naked_yield();
3257 } else {
3258 ThreadState old_state = thread->osthread()->get_state();
3259 thread->osthread()->set_state(SLEEPING);
3260 if (!thread->sleep(millis)) { // interrupted
3261 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3262 // us while we were sleeping. We do not overwrite those.
3263 if (!HAS_PENDING_EXCEPTION) {
3264 if (event.should_commit()) {
3265 post_thread_sleep_event(&event, millis);
3266 }
3267 HOTSPOT_THREAD_SLEEP_END(1);
3268
3269 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3270 // to properly restore the thread state. That's likely wrong.
3271 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3272 }
3273 }
3274 thread->osthread()->set_state(old_state);
3275 }
3276 if (event.should_commit()) {
3277 post_thread_sleep_event(&event, millis);
3278 }
3279 HOTSPOT_THREAD_SLEEP_END(0);
3280 JVM_END
3281
3282 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3283 JVMWrapper("JVM_CurrentThread");
3284 oop jthread = thread->threadObj();
3285 assert(jthread != NULL, "no current thread!");
3286 return JNIHandles::make_local(THREAD, jthread);
3287 JVM_END
3288
3289 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3290 JVMWrapper("JVM_Interrupt");
3291
3292 ThreadsListHandle tlh(thread);
3293 JavaThread* receiver = NULL;
3294 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3295 if (is_alive) {
3296 // jthread refers to a live JavaThread.
3297 receiver->interrupt();
3298 }
3299 JVM_END
3300
3301
3302 // Return true iff the current thread has locked the object passed in
3303
3304 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3305 JVMWrapper("JVM_HoldsLock");
3306 assert(THREAD->is_Java_thread(), "sanity check");
3307 if (obj == NULL) {
3308 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3309 }
3310 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3311 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3312 JVM_END
3313
3314
3315 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3316 JVMWrapper("JVM_DumpAllStacks");
3317 VM_PrintThreads op;
3318 VMThread::execute(&op);
3319 if (JvmtiExport::should_post_data_dump()) {
3320 JvmtiExport::post_data_dump();
3321 }
3322 JVM_END
3323
3324 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3325 JVMWrapper("JVM_SetNativeThreadName");
3326
3327 // We don't use a ThreadsListHandle here because the current thread
3328 // must be alive.
3329 oop java_thread = JNIHandles::resolve_non_null(jthread);
3330 JavaThread* thr = java_lang_Thread::thread(java_thread);
3331 if (thread == thr && !thr->has_attached_via_jni()) {
3332 // Thread naming is only supported for the current thread and
3333 // we don't set the name of an attached thread to avoid stepping
3334 // on other programs.
3335 ResourceMark rm(thread);
3336 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3337 os::set_native_thread_name(thread_name);
3338 }
3339 JVM_END
3340
3341 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3342
3343 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3344 JVMWrapper("JVM_GetClassContext");
3345 ResourceMark rm(THREAD);
3346 JvmtiVMObjectAllocEventCollector oam;
3347 vframeStream vfst(thread);
3348
3349 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3350 // This must only be called from SecurityManager.getClassContext
3351 Method* m = vfst.method();
3352 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3353 m->name() == vmSymbols::getClassContext_name() &&
3354 m->signature() == vmSymbols::void_class_array_signature())) {
3355 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3356 }
3357 }
3358
3359 // Collect method holders
3360 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3361 for (; !vfst.at_end(); vfst.security_next()) {
3362 Method* m = vfst.method();
3363 // Native frames are not returned
3364 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3365 Klass* holder = m->method_holder();
3366 assert(holder->is_klass(), "just checking");
3367 klass_array->append(holder);
3368 }
3369 }
3370
3371 // Create result array of type [Ljava/lang/Class;
3372 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3373 // Fill in mirrors corresponding to method holders
3374 for (int i = 0; i < klass_array->length(); i++) {
3375 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3376 }
3377
3378 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3379 JVM_END
3380
3381
3382 // java.lang.Package ////////////////////////////////////////////////////////////////
3383
3384
3385 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3386 JVMWrapper("JVM_GetSystemPackage");
3387 ResourceMark rm(THREAD);
3388 JvmtiVMObjectAllocEventCollector oam;
3389 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3390 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3391 return (jstring) JNIHandles::make_local(THREAD, result);
3392 JVM_END
3393
3394
3395 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3396 JVMWrapper("JVM_GetSystemPackages");
3397 JvmtiVMObjectAllocEventCollector oam;
3398 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3399 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3400 JVM_END
3401
3402
3403 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3404
3405
3406 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3407 JVMWrapper("JVM_GetAndClearReferencePendingList");
3408
3409 MonitorLocker ml(Heap_lock);
3410 oop ref = Universe::reference_pending_list();
3411 if (ref != NULL) {
3412 Universe::clear_reference_pending_list();
3413 }
3414 return JNIHandles::make_local(THREAD, ref);
3415 JVM_END
3416
3417 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3418 JVMWrapper("JVM_HasReferencePendingList");
3419 MonitorLocker ml(Heap_lock);
3420 return Universe::has_reference_pending_list();
3421 JVM_END
3422
3423 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3424 JVMWrapper("JVM_WaitForReferencePendingList");
3425 MonitorLocker ml(Heap_lock);
3426 while (!Universe::has_reference_pending_list()) {
3427 ml.wait();
3428 }
3429 JVM_END
3430
3431
3432 // ObjectInputStream ///////////////////////////////////////////////////////////////
3433
3434 // Return the first user-defined class loader up the execution stack, or null
3435 // if only code from the bootstrap or platform class loader is on the stack.
3436
3437 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3438 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3439 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3440 oop loader = vfst.method()->method_holder()->class_loader();
3441 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3442 return JNIHandles::make_local(THREAD, loader);
3443 }
3444 }
3445 return NULL;
3446 JVM_END
3447
3448
3449 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3450
3451
3452 // resolve array handle and check arguments
3453 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3454 if (arr == NULL) {
3455 THROW_0(vmSymbols::java_lang_NullPointerException());
3456 }
3457 oop a = JNIHandles::resolve_non_null(arr);
3458 if (!a->is_array()) {
3459 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3460 } else if (type_array_only && !a->is_typeArray()) {
3461 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3462 }
3463 return arrayOop(a);
3464 }
3465
3466
3467 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3468 JVMWrapper("JVM_GetArrayLength");
3469 arrayOop a = check_array(env, arr, false, CHECK_0);
3470 return a->length();
3471 JVM_END
3472
3473
3474 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3475 JVMWrapper("JVM_Array_Get");
3476 JvmtiVMObjectAllocEventCollector oam;
3477 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3478 jvalue value;
3479 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3480 oop box = Reflection::box(&value, type, CHECK_NULL);
3481 return JNIHandles::make_local(THREAD, box);
3482 JVM_END
3483
3484
3485 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3486 JVMWrapper("JVM_GetPrimitiveArrayElement");
3487 jvalue value;
3488 value.i = 0; // to initialize value before getting used in CHECK
3489 arrayOop a = check_array(env, arr, true, CHECK_(value));
3490 assert(a->is_typeArray(), "just checking");
3491 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3492 BasicType wide_type = (BasicType) wCode;
3493 if (type != wide_type) {
3494 Reflection::widen(&value, type, wide_type, CHECK_(value));
3495 }
3496 return value;
3497 JVM_END
3498
3499
3500 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3501 JVMWrapper("JVM_SetArrayElement");
3502 arrayOop a = check_array(env, arr, false, CHECK);
3503 oop box = JNIHandles::resolve(val);
3504 jvalue value;
3505 value.i = 0; // to initialize value before getting used in CHECK
3506 BasicType value_type;
3507 if (a->is_objArray()) {
3508 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3509 value_type = Reflection::unbox_for_regular_object(box, &value);
3510 } else {
3511 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3512 }
3513 Reflection::array_set(&value, a, index, value_type, CHECK);
3514 JVM_END
3515
3516
3517 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3518 JVMWrapper("JVM_SetPrimitiveArrayElement");
3519 arrayOop a = check_array(env, arr, true, CHECK);
3520 assert(a->is_typeArray(), "just checking");
3521 BasicType value_type = (BasicType) vCode;
3522 Reflection::array_set(&v, a, index, value_type, CHECK);
3523 JVM_END
3524
3525
3526 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3527 JVMWrapper("JVM_NewArray");
3528 JvmtiVMObjectAllocEventCollector oam;
3529 oop element_mirror = JNIHandles::resolve(eltClass);
3530 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3531 return JNIHandles::make_local(THREAD, result);
3532 JVM_END
3533
3534
3535 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3536 JVMWrapper("JVM_NewMultiArray");
3537 JvmtiVMObjectAllocEventCollector oam;
3538 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3539 oop element_mirror = JNIHandles::resolve(eltClass);
3540 assert(dim_array->is_typeArray(), "just checking");
3541 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3542 return JNIHandles::make_local(THREAD, result);
3543 JVM_END
3544
3545
3546 // Library support ///////////////////////////////////////////////////////////////////////////
3547
3548 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3549 //%note jvm_ct
3550 JVMWrapper("JVM_LoadLibrary");
3551 char ebuf[1024];
3552 void *load_result;
3553 {
3554 ThreadToNativeFromVM ttnfvm(thread);
3555 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3556 }
3557 if (load_result == NULL) {
3558 char msg[1024];
3559 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3560 // Since 'ebuf' may contain a string encoded using
3561 // platform encoding scheme, we need to pass
3562 // Exceptions::unsafe_to_utf8 to the new_exception method
3563 // as the last argument. See bug 6367357.
3564 Handle h_exception =
3565 Exceptions::new_exception(thread,
3566 vmSymbols::java_lang_UnsatisfiedLinkError(),
3567 msg, Exceptions::unsafe_to_utf8);
3568
3569 THROW_HANDLE_0(h_exception);
3570 }
3571 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3572 return load_result;
3573 JVM_END
3574
3575
3576 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3577 JVMWrapper("JVM_UnloadLibrary");
3578 os::dll_unload(handle);
3579 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3580 JVM_END
3581
3582
3583 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3584 JVMWrapper("JVM_FindLibraryEntry");
3585 void* find_result = os::dll_lookup(handle, name);
3586 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3587 find_result != NULL ? "Found" : "Failed to find",
3588 name, p2i(handle));
3589 return find_result;
3590 JVM_END
3591
3592
3593 // JNI version ///////////////////////////////////////////////////////////////////////////////
3594
3595 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3596 JVMWrapper("JVM_IsSupportedJNIVersion");
3597 return Threads::is_supported_jni_version_including_1_1(version);
3598 JVM_END
3599
3600
3601 // String support ///////////////////////////////////////////////////////////////////////////
3602
3603 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3604 JVMWrapper("JVM_InternString");
3605 JvmtiVMObjectAllocEventCollector oam;
3606 if (str == NULL) return NULL;
3607 oop string = JNIHandles::resolve_non_null(str);
3608 oop result = StringTable::intern(string, CHECK_NULL);
3609 return (jstring) JNIHandles::make_local(THREAD, result);
3610 JVM_END
3611
3612
3613 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3614
3615 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3616 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3617 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3618 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3619 // nature. JavaThreads will be "in native" when using this API from JDK code.
3620
3621
3622 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3623 VM_Exit::block_if_vm_exited();
3624 JVMWrapper("JVM_RawMonitorCreate");
3625 return new os::PlatformMutex();
3626 }
3627
3628
3629 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3630 VM_Exit::block_if_vm_exited();
3631 JVMWrapper("JVM_RawMonitorDestroy");
3632 delete ((os::PlatformMutex*) mon);
3633 }
3634
3635
3636 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3637 VM_Exit::block_if_vm_exited();
3638 JVMWrapper("JVM_RawMonitorEnter");
3639 ((os::PlatformMutex*) mon)->lock();
3640 return 0;
3641 }
3642
3643
3644 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3645 VM_Exit::block_if_vm_exited();
3646 JVMWrapper("JVM_RawMonitorExit");
3647 ((os::PlatformMutex*) mon)->unlock();
3648 }
3649
3650
3651 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3652
3653 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3654 Handle loader, Handle protection_domain,
3655 jboolean throwError, TRAPS) {
3656 // Security Note:
3657 // The Java level wrapper will perform the necessary security check allowing
3658 // us to pass the NULL as the initiating class loader. The VM is responsible for
3659 // the checkPackageAccess relative to the initiating class loader via the
3660 // protection_domain. The protection_domain is passed as NULL by the java code
3661 // if there is no security manager in 3-arg Class.forName().
3662 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3663
3664 // Check if we should initialize the class
3665 if (init && klass->is_instance_klass()) {
3666 klass->initialize(CHECK_NULL);
3667 }
3668 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3669 }
3670
3671
3672 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3673
3674 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3675 JVMWrapper("JVM_InvokeMethod");
3676 Handle method_handle;
3677 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3678 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3679 Handle receiver(THREAD, JNIHandles::resolve(obj));
3680 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3681 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3682 jobject res = JNIHandles::make_local(THREAD, result);
3683 if (JvmtiExport::should_post_vm_object_alloc()) {
3684 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3685 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3686 if (java_lang_Class::is_primitive(ret_type)) {
3687 // Only for primitive type vm allocates memory for java object.
3688 // See box() method.
3689 JvmtiExport::post_vm_object_alloc(thread, result);
3690 }
3691 }
3692 return res;
3693 } else {
3694 THROW_0(vmSymbols::java_lang_StackOverflowError());
3695 }
3696 JVM_END
3697
3698
3699 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3700 JVMWrapper("JVM_NewInstanceFromConstructor");
3701 oop constructor_mirror = JNIHandles::resolve(c);
3702 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3703 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3704 jobject res = JNIHandles::make_local(THREAD, result);
3705 if (JvmtiExport::should_post_vm_object_alloc()) {
3706 JvmtiExport::post_vm_object_alloc(thread, result);
3707 }
3708 return res;
3709 JVM_END
3710
3711 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3712
3713 JVM_LEAF(jboolean, JVM_SupportsCX8())
3714 JVMWrapper("JVM_SupportsCX8");
3715 return VM_Version::supports_cx8();
3716 JVM_END
3717
3718 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3719 JVMWrapper("JVM_InitializeFromArchive");
3720 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3721 assert(k->is_klass(), "just checking");
3722 HeapShared::initialize_from_archived_subgraph(k);
3723 JVM_END
3724
3725 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3726 jclass caller,
3727 jstring invokedName,
3728 jobject invokedType,
3729 jobject methodType,
3730 jobject implMethodMember,
3731 jobject instantiatedMethodType,
3732 jclass lambdaProxyClass))
3733 JVMWrapper("JVM_RegisterLambdaProxyClassForArchiving");
3734 #if INCLUDE_CDS
3735 if (!DynamicDumpSharedSpaces) {
3736 return;
3737 }
3738
3739 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3740 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3741 if (caller_ik->is_hidden() || caller_ik->is_unsafe_anonymous()) {
3742 // VM anonymous classes and hidden classes not of type lambda proxy classes are currently not being archived.
3743 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3744 // registered for archiving.
3745 return;
3746 }
3747 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3748 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3749 assert(lambda_ik->is_hidden(), "must be a hidden class");
3750 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3751
3752 Symbol* invoked_name = NULL;
3753 if (invokedName != NULL) {
3754 invoked_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(invokedName));
3755 }
3756 Handle invoked_type_oop(THREAD, JNIHandles::resolve_non_null(invokedType));
3757 Symbol* invoked_type = java_lang_invoke_MethodType::as_signature(invoked_type_oop(), true);
3758
3759 Handle method_type_oop(THREAD, JNIHandles::resolve_non_null(methodType));
3760 Symbol* method_type = java_lang_invoke_MethodType::as_signature(method_type_oop(), true);
3761
3762 Handle impl_method_member_oop(THREAD, JNIHandles::resolve_non_null(implMethodMember));
3763 assert(java_lang_invoke_MemberName::is_method(impl_method_member_oop()), "must be");
3764 Method* m = java_lang_invoke_MemberName::vmtarget(impl_method_member_oop());
3765
3766 Handle instantiated_method_type_oop(THREAD, JNIHandles::resolve_non_null(instantiatedMethodType));
3767 Symbol* instantiated_method_type = java_lang_invoke_MethodType::as_signature(instantiated_method_type_oop(), true);
3768
3769 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, invoked_name, invoked_type,
3770 method_type, m, instantiated_method_type);
3771 #endif // INCLUDE_CDS
3772 JVM_END
3773
3774 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3775 jclass caller,
3776 jstring invokedName,
3777 jobject invokedType,
3778 jobject methodType,
3779 jobject implMethodMember,
3780 jobject instantiatedMethodType,
3781 jboolean initialize))
3782 JVMWrapper("JVM_LookupLambdaProxyClassFromArchive");
3783 #if INCLUDE_CDS
3784 if (!DynamicArchive::is_mapped()) {
3785 return NULL;
3786 }
3787
3788 if (invokedName == NULL || invokedType == NULL || methodType == NULL ||
3789 implMethodMember == NULL || instantiatedMethodType == NULL) {
3790 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
3791 }
3792
3793 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3794 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3795 if (!caller_ik->is_shared()) {
3796 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3797 return NULL;
3798 }
3799
3800 Symbol* invoked_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(invokedName));
3801 Handle invoked_type_oop(THREAD, JNIHandles::resolve_non_null(invokedType));
3802 Symbol* invoked_type = java_lang_invoke_MethodType::as_signature(invoked_type_oop(), true);
3803
3804 Handle method_type_oop(THREAD, JNIHandles::resolve_non_null(methodType));
3805 Symbol* method_type = java_lang_invoke_MethodType::as_signature(method_type_oop(), true);
3806
3807 Handle impl_method_member_oop(THREAD, JNIHandles::resolve_non_null(implMethodMember));
3808 assert(java_lang_invoke_MemberName::is_method(impl_method_member_oop()), "must be");
3809 Method* m = java_lang_invoke_MemberName::vmtarget(impl_method_member_oop());
3810
3811 Handle instantiated_method_type_oop(THREAD, JNIHandles::resolve_non_null(instantiatedMethodType));
3812 Symbol* instantiated_method_type = java_lang_invoke_MethodType::as_signature(instantiated_method_type_oop(), true);
3813
3814 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, invoked_name, invoked_type,
3815 method_type, m, instantiated_method_type);
3816 jclass jcls = NULL;
3817 if (lambda_ik != NULL) {
3818 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, initialize, THREAD);
3819 jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3820 }
3821 return jcls;
3822 #else
3823 return NULL;
3824 #endif // INCLUDE_CDS
3825 JVM_END
3826
3827 JVM_ENTRY(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3828 JVMWrapper("JVM_IsCDSDumpingEnable");
3829 return DynamicDumpSharedSpaces;
3830 JVM_END
3831
3832 JVM_ENTRY(jboolean, JVM_IsCDSSharingEnabled(JNIEnv* env))
3833 JVMWrapper("JVM_IsCDSSharingEnable");
3834 return UseSharedSpaces;
3835 JVM_END
3836
3837 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForCDSDump())
3838 JVMWrapper("JVM_GetRandomSeedForCDSDump");
3839 if (DumpSharedSpaces) {
3840 const char* release = Abstract_VM_Version::vm_release();
3841 const char* dbg_level = Abstract_VM_Version::jdk_debug_level();
3842 const char* version = VM_Version::internal_vm_info_string();
3843 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3844 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3845 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3846 seed += (jlong)Abstract_VM_Version::vm_major_version();
3847 seed += (jlong)Abstract_VM_Version::vm_minor_version();
3848 seed += (jlong)Abstract_VM_Version::vm_security_version();
3849 seed += (jlong)Abstract_VM_Version::vm_patch_version();
3850 if (seed == 0) { // don't let this ever be zero.
3851 seed = 0x87654321;
3852 }
3853 log_debug(cds)("JVM_GetRandomSeedForCDSDump() = " JLONG_FORMAT, seed);
3854 return seed;
3855 } else {
3856 return 0;
3857 }
3858 JVM_END
3859
3860 // Returns an array of all live Thread objects (VM internal JavaThreads,
3861 // jvmti agent threads, and JNI attaching threads are skipped)
3862 // See CR 6404306 regarding JNI attaching threads
3863 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3864 ResourceMark rm(THREAD);
3865 ThreadsListEnumerator tle(THREAD, false, false);
3866 JvmtiVMObjectAllocEventCollector oam;
3867
3868 int num_threads = tle.num_threads();
3869 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3870 objArrayHandle threads_ah(THREAD, r);
3871
3872 for (int i = 0; i < num_threads; i++) {
3873 Handle h = tle.get_threadObj(i);
3874 threads_ah->obj_at_put(i, h());
3875 }
3876
3877 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3878 JVM_END
3879
3880
3881 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3882 // Return StackTraceElement[][], each element is the stack trace of a thread in
3883 // the corresponding entry in the given threads array
3884 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3885 JVMWrapper("JVM_DumpThreads");
3886 JvmtiVMObjectAllocEventCollector oam;
3887
3888 // Check if threads is null
3889 if (threads == NULL) {
3890 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3891 }
3892
3893 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3894 objArrayHandle ah(THREAD, a);
3895 int num_threads = ah->length();
3896 // check if threads is non-empty array
3897 if (num_threads == 0) {
3898 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3899 }
3900
3901 // check if threads is not an array of objects of Thread class
3902 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3903 if (k != SystemDictionary::Thread_klass()) {
3904 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3905 }
3906
3907 ResourceMark rm(THREAD);
3908
3909 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3910 for (int i = 0; i < num_threads; i++) {
3911 oop thread_obj = ah->obj_at(i);
3912 instanceHandle h(THREAD, (instanceOop) thread_obj);
3913 thread_handle_array->append(h);
3914 }
3915
3916 // The JavaThread references in thread_handle_array are validated
3917 // in VM_ThreadDump::doit().
3918 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3919 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3920
3921 JVM_END
3922
3923 // JVM monitoring and management support
3924 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3925 return Management::get_jmm_interface(version);
3926 JVM_END
3927
3928 // com.sun.tools.attach.VirtualMachine agent properties support
3929 //
3930 // Initialize the agent properties with the properties maintained in the VM
3931 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3932 JVMWrapper("JVM_InitAgentProperties");
3933 ResourceMark rm;
3934
3935 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3936
3937 PUTPROP(props, "sun.java.command", Arguments::java_command());
3938 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3939 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3940 return properties;
3941 JVM_END
3942
3943 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3944 {
3945 JVMWrapper("JVM_GetEnclosingMethodInfo");
3946 JvmtiVMObjectAllocEventCollector oam;
3947
3948 if (ofClass == NULL) {
3949 return NULL;
3950 }
3951 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3952 // Special handling for primitive objects
3953 if (java_lang_Class::is_primitive(mirror())) {
3954 return NULL;
3955 }
3956 Klass* k = java_lang_Class::as_Klass(mirror());
3957 if (!k->is_instance_klass()) {
3958 return NULL;
3959 }
3960 InstanceKlass* ik = InstanceKlass::cast(k);
3961 int encl_method_class_idx = ik->enclosing_method_class_index();
3962 if (encl_method_class_idx == 0) {
3963 return NULL;
3964 }
3965 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3966 objArrayHandle dest(THREAD, dest_o);
3967 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3968 dest->obj_at_put(0, enc_k->java_mirror());
3969 int encl_method_method_idx = ik->enclosing_method_method_index();
3970 if (encl_method_method_idx != 0) {
3971 Symbol* sym = ik->constants()->symbol_at(
3972 extract_low_short_from_int(
3973 ik->constants()->name_and_type_at(encl_method_method_idx)));
3974 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3975 dest->obj_at_put(1, str());
3976 sym = ik->constants()->symbol_at(
3977 extract_high_short_from_int(
3978 ik->constants()->name_and_type_at(encl_method_method_idx)));
3979 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3980 dest->obj_at_put(2, str());
3981 }
3982 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3983 }
3984 JVM_END
3985
3986 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3987 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3988 ResourceMark rm(THREAD);
3989
3990 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3991 return NULL;
3992 }
3993
3994 char** vm_flags = Arguments::jvm_flags_array();
3995 char** vm_args = Arguments::jvm_args_array();
3996 int num_flags = Arguments::num_jvm_flags();
3997 int num_args = Arguments::num_jvm_args();
3998
3999 InstanceKlass* ik = SystemDictionary::String_klass();
4000 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
4001 objArrayHandle result_h(THREAD, r);
4002
4003 int index = 0;
4004 for (int j = 0; j < num_flags; j++, index++) {
4005 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
4006 result_h->obj_at_put(index, h());
4007 }
4008 for (int i = 0; i < num_args; i++, index++) {
4009 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
4010 result_h->obj_at_put(index, h());
4011 }
4012 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
4013 JVM_END
4014
4015 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
4016 return os::get_signal_number(name);
4017 JVM_END