1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/modules.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/stringTable.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "gc/shared/collectedHeap.inline.hpp"
40 #include "interpreter/bytecode.hpp"
41 #include "interpreter/bytecodeUtils.hpp"
42 #include "jfr/jfrEvents.hpp"
43 #include "logging/log.hpp"
44 #include "memory/heapShared.hpp"
45 #include "memory/oopFactory.hpp"
46 #include "memory/referenceType.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/access.inline.hpp"
50 #include "oops/constantPool.hpp"
51 #include "oops/fieldStreams.inline.hpp"
52 #include "oops/instanceKlass.hpp"
53 #include "oops/method.hpp"
54 #include "oops/recordComponent.hpp"
55 #include "oops/objArrayKlass.hpp"
56 #include "oops/objArrayOop.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "prims/jvm_misc.hpp"
59 #include "prims/jvmtiExport.hpp"
60 #include "prims/jvmtiThreadState.hpp"
61 #include "prims/nativeLookup.hpp"
62 #include "prims/stackwalk.hpp"
63 #include "runtime/arguments.hpp"
64 #include "runtime/atomic.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/init.hpp"
67 #include "runtime/interfaceSupport.inline.hpp"
68 #include "runtime/deoptimization.hpp"
69 #include "runtime/handshake.hpp"
70 #include "runtime/java.hpp"
71 #include "runtime/javaCalls.hpp"
72 #include "runtime/jfieldIDWorkaround.hpp"
73 #include "runtime/jniHandles.inline.hpp"
74 #include "runtime/os.inline.hpp"
75 #include "runtime/perfData.hpp"
76 #include "runtime/reflection.hpp"
77 #include "runtime/thread.inline.hpp"
78 #include "runtime/threadSMR.hpp"
79 #include "runtime/vframe.inline.hpp"
80 #include "runtime/vmOperations.hpp"
81 #include "runtime/vm_version.hpp"
82 #include "services/attachListener.hpp"
83 #include "services/management.hpp"
84 #include "services/threadService.hpp"
85 #include "utilities/copy.hpp"
86 #include "utilities/defaultStream.hpp"
87 #include "utilities/dtrace.hpp"
88 #include "utilities/events.hpp"
89 #include "utilities/histogram.hpp"
90 #include "utilities/macros.hpp"
91 #include "utilities/utf8.hpp"
92 #if INCLUDE_CDS
93 #include "classfile/systemDictionaryShared.hpp"
94 #endif
95
96 #include <errno.h>
97 #include <jfr/recorder/jfrRecorder.hpp>
98
99 /*
100 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
101 such ctors and calls MUST NOT come between an oop declaration/init and its
102 usage because if objects are move this may cause various memory stomps, bus
103 errors and segfaults. Here is a cookbook for causing so called "naked oop
104 failures":
105
106 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
107 JVMWrapper("JVM_GetClassDeclaredFields");
108
109 // Object address to be held directly in mirror & not visible to GC
110 oop mirror = JNIHandles::resolve_non_null(ofClass);
111
112 // If this ctor can hit a safepoint, moving objects around, then
113 ComplexConstructor foo;
114
115 // Boom! mirror may point to JUNK instead of the intended object
116 (some dereference of mirror)
117
118 // Here's another call that may block for GC, making mirror stale
119 MutexLocker ml(some_lock);
120
121 // And here's an initializer that can result in a stale oop
122 // all in one step.
123 oop o = call_that_can_throw_exception(TRAPS);
124
125
126 The solution is to keep the oop declaration BELOW the ctor or function
127 call that might cause a GC, do another resolve to reassign the oop, or
128 consider use of a Handle instead of an oop so there is immunity from object
129 motion. But note that the "QUICK" entries below do not have a handlemark
130 and thus can only support use of handles passed in.
131 */
132
133 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
134 ResourceMark rm;
135 int line_number = -1;
136 const char * source_file = NULL;
137 const char * trace = "explicit";
138 InstanceKlass* caller = NULL;
139 JavaThread* jthread = JavaThread::current();
140 if (jthread->has_last_Java_frame()) {
141 vframeStream vfst(jthread);
142
143 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
144 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
145 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
146 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
147 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
148
149 Method* last_caller = NULL;
150
151 while (!vfst.at_end()) {
152 Method* m = vfst.method();
153 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
154 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
155 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
156 break;
157 }
158 last_caller = m;
159 vfst.next();
160 }
161 // if this is called from Class.forName0 and that is called from Class.forName,
162 // then print the caller of Class.forName. If this is Class.loadClass, then print
163 // that caller, otherwise keep quiet since this should be picked up elsewhere.
164 bool found_it = false;
165 if (!vfst.at_end() &&
166 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
167 vfst.method()->name() == vmSymbols::forName0_name()) {
168 vfst.next();
169 if (!vfst.at_end() &&
170 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
171 vfst.method()->name() == vmSymbols::forName_name()) {
172 vfst.next();
173 found_it = true;
174 }
175 } else if (last_caller != NULL &&
176 last_caller->method_holder()->name() ==
177 vmSymbols::java_lang_ClassLoader() &&
178 last_caller->name() == vmSymbols::loadClass_name()) {
179 found_it = true;
180 } else if (!vfst.at_end()) {
181 if (vfst.method()->is_native()) {
182 // JNI call
183 found_it = true;
184 }
185 }
186 if (found_it && !vfst.at_end()) {
187 // found the caller
188 caller = vfst.method()->method_holder();
189 line_number = vfst.method()->line_number_from_bci(vfst.bci());
190 if (line_number == -1) {
191 // show method name if it's a native method
192 trace = vfst.method()->name_and_sig_as_C_string();
193 }
194 Symbol* s = caller->source_file_name();
195 if (s != NULL) {
196 source_file = s->as_C_string();
197 }
198 }
199 }
200 if (caller != NULL) {
201 if (to_class != caller) {
202 const char * from = caller->external_name();
203 const char * to = to_class->external_name();
204 // print in a single call to reduce interleaving between threads
205 if (source_file != NULL) {
206 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
207 } else {
208 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
209 }
210 }
211 }
212 }
213
214 void trace_class_resolution(Klass* to_class) {
215 EXCEPTION_MARK;
216 trace_class_resolution_impl(to_class, THREAD);
217 if (HAS_PENDING_EXCEPTION) {
218 CLEAR_PENDING_EXCEPTION;
219 }
220 }
221
222 // Wrapper to trace JVM functions
223
224 #ifdef ASSERT
225 Histogram* JVMHistogram;
226 volatile int JVMHistogram_lock = 0;
227
228 class JVMHistogramElement : public HistogramElement {
229 public:
230 JVMHistogramElement(const char* name);
231 };
232
233 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
234 _name = elementName;
235 uintx count = 0;
236
237 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) {
238 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) {
239 count +=1;
240 if ( (WarnOnStalledSpinLock > 0)
241 && (count % WarnOnStalledSpinLock == 0)) {
242 warning("JVMHistogram_lock seems to be stalled");
243 }
244 }
245 }
246
247 if(JVMHistogram == NULL)
248 JVMHistogram = new Histogram("JVM Call Counts",100);
249
250 JVMHistogram->add_element(this);
251 Atomic::dec(&JVMHistogram_lock);
252 }
253
254 #define JVMCountWrapper(arg) \
255 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
256 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
257
258 #define JVMWrapper(arg) JVMCountWrapper(arg);
259 #else
260 #define JVMWrapper(arg)
261 #endif
262
263
264 // Interface version /////////////////////////////////////////////////////////////////////
265
266
267 JVM_LEAF(jint, JVM_GetInterfaceVersion())
268 return JVM_INTERFACE_VERSION;
269 JVM_END
270
271
272 // java.lang.System //////////////////////////////////////////////////////////////////////
273
274
275 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
276 JVMWrapper("JVM_CurrentTimeMillis");
277 return os::javaTimeMillis();
278 JVM_END
279
280 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
281 JVMWrapper("JVM_NanoTime");
282 return os::javaTimeNanos();
283 JVM_END
284
285 // The function below is actually exposed by jdk.internal.misc.VM and not
286 // java.lang.System, but we choose to keep it here so that it stays next
287 // to JVM_CurrentTimeMillis and JVM_NanoTime
288
289 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
290 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
291
292 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
293 JVMWrapper("JVM_GetNanoTimeAdjustment");
294 jlong seconds;
295 jlong nanos;
296
297 os::javaTimeSystemUTC(seconds, nanos);
298
299 // We're going to verify that the result can fit in a long.
300 // For that we need the difference in seconds between 'seconds'
301 // and 'offset_secs' to be such that:
302 // |seconds - offset_secs| < (2^63/10^9)
303 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
304 // which makes |seconds - offset_secs| < 2^33
305 // and we will prefer +/- 2^32 as the maximum acceptable diff
306 // as 2^32 has a more natural feel than 2^33...
307 //
308 // So if |seconds - offset_secs| >= 2^32 - we return a special
309 // sentinel value (-1) which the caller should take as an
310 // exception value indicating that the offset given to us is
311 // too far from range of the current time - leading to too big
312 // a nano adjustment. The caller is expected to recover by
313 // computing a more accurate offset and calling this method
314 // again. (For the record 2^32 secs is ~136 years, so that
315 // should rarely happen)
316 //
317 jlong diff = seconds - offset_secs;
318 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
319 return -1; // sentinel value: the offset is too far off the target
320 }
321
322 // return the adjustment. If you compute a time by adding
323 // this number of nanoseconds along with the number of seconds
324 // in the offset you should get the current UTC time.
325 return (diff * (jlong)1000000000) + nanos;
326 JVM_END
327
328 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
329 jobject dst, jint dst_pos, jint length))
330 JVMWrapper("JVM_ArrayCopy");
331 // Check if we have null pointers
332 if (src == NULL || dst == NULL) {
333 THROW(vmSymbols::java_lang_NullPointerException());
334 }
335 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
336 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
337 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
338 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
339 // Do copy
340 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
341 JVM_END
342
343
344 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
345 JavaValue r(T_OBJECT);
346 // public synchronized Object put(Object key, Object value);
347 HandleMark hm(THREAD);
348 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
349 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
350 JavaCalls::call_virtual(&r,
351 props,
352 SystemDictionary::Properties_klass(),
353 vmSymbols::put_name(),
354 vmSymbols::object_object_object_signature(),
355 key_str,
356 value_str,
357 THREAD);
358 }
359
360
361 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
362
363 /*
364 * Return all of the system properties in a Java String array with alternating
365 * names and values from the jvm SystemProperty.
366 * Which includes some internal and all commandline -D defined properties.
367 */
368 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
369 JVMWrapper("JVM_GetProperties");
370 ResourceMark rm(THREAD);
371 HandleMark hm(THREAD);
372 int ndx = 0;
373 int fixedCount = 2;
374
375 SystemProperty* p = Arguments::system_properties();
376 int count = Arguments::PropertyList_count(p);
377
378 // Allocate result String array
379 InstanceKlass* ik = SystemDictionary::String_klass();
380 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
381 objArrayHandle result_h(THREAD, r);
382
383 while (p != NULL) {
384 const char * key = p->key();
385 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
386 const char * value = p->value();
387 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
388 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
389 result_h->obj_at_put(ndx * 2, key_str());
390 result_h->obj_at_put(ndx * 2 + 1, value_str());
391 ndx++;
392 }
393 p = p->next();
394 }
395
396 // Convert the -XX:MaxDirectMemorySize= command line flag
397 // to the sun.nio.MaxDirectMemorySize property.
398 // Do this after setting user properties to prevent people
399 // from setting the value with a -D option, as requested.
400 // Leave empty if not supplied
401 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
402 char as_chars[256];
403 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
404 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
405 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
406 result_h->obj_at_put(ndx * 2, key_str());
407 result_h->obj_at_put(ndx * 2 + 1, value_str());
408 ndx++;
409 }
410
411 // JVM monitoring and management support
412 // Add the sun.management.compiler property for the compiler's name
413 {
414 #undef CSIZE
415 #if defined(_LP64) || defined(_WIN64)
416 #define CSIZE "64-Bit "
417 #else
418 #define CSIZE
419 #endif // 64bit
420
421 #ifdef TIERED
422 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
423 #else
424 #if defined(COMPILER1)
425 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
426 #elif defined(COMPILER2)
427 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
428 #elif INCLUDE_JVMCI
429 #error "INCLUDE_JVMCI should imply TIERED"
430 #else
431 const char* compiler_name = "";
432 #endif // compilers
433 #endif // TIERED
434
435 if (*compiler_name != '\0' &&
436 (Arguments::mode() != Arguments::_int)) {
437 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
438 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
439 result_h->obj_at_put(ndx * 2, key_str());
440 result_h->obj_at_put(ndx * 2 + 1, value_str());
441 ndx++;
442 }
443 }
444
445 return (jobjectArray) JNIHandles::make_local(env, result_h());
446 JVM_END
447
448
449 /*
450 * Return the temporary directory that the VM uses for the attach
451 * and perf data files.
452 *
453 * It is important that this directory is well-known and the
454 * same for all VM instances. It cannot be affected by configuration
455 * variables such as java.io.tmpdir.
456 */
457 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
458 JVMWrapper("JVM_GetTemporaryDirectory");
459 HandleMark hm(THREAD);
460 const char* temp_dir = os::get_temp_directory();
461 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
462 return (jstring) JNIHandles::make_local(env, h());
463 JVM_END
464
465
466 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
467
468 extern volatile jint vm_created;
469
470 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
471 JVMWrapper("JVM_BeforeHalt");
472 // Link all classes for dynamic CDS dumping before vm exit.
473 if (DynamicDumpSharedSpaces) {
474 MetaspaceShared::link_and_cleanup_shared_classes(THREAD);
475 }
476 EventShutdown event;
477 if (event.should_commit()) {
478 event.set_reason("Shutdown requested from Java");
479 event.commit();
480 }
481 JVM_END
482
483
484 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
485 before_exit(thread);
486 vm_exit(code);
487 JVM_END
488
489
490 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
491 JVMWrapper("JVM_GC");
492 if (!DisableExplicitGC) {
493 Universe::heap()->collect(GCCause::_java_lang_system_gc);
494 }
495 JVM_END
496
497
498 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
499 JVMWrapper("JVM_MaxObjectInspectionAge");
500 return Universe::heap()->millis_since_last_gc();
501 JVM_END
502
503
504 static inline jlong convert_size_t_to_jlong(size_t val) {
505 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
506 NOT_LP64 (return (jlong)val;)
507 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
508 }
509
510 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
511 JVMWrapper("JVM_TotalMemory");
512 size_t n = Universe::heap()->capacity();
513 return convert_size_t_to_jlong(n);
514 JVM_END
515
516
517 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
518 JVMWrapper("JVM_FreeMemory");
519 size_t n = Universe::heap()->unused();
520 return convert_size_t_to_jlong(n);
521 JVM_END
522
523
524 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
525 JVMWrapper("JVM_MaxMemory");
526 size_t n = Universe::heap()->max_capacity();
527 return convert_size_t_to_jlong(n);
528 JVM_END
529
530
531 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
532 JVMWrapper("JVM_ActiveProcessorCount");
533 return os::active_processor_count();
534 JVM_END
535
536
537
538 // java.lang.Throwable //////////////////////////////////////////////////////
539
540 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
541 JVMWrapper("JVM_FillInStackTrace");
542 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
543 java_lang_Throwable::fill_in_stack_trace(exception);
544 JVM_END
545
546 // java.lang.NullPointerException ///////////////////////////////////////////
547
548 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
549 if (!ShowCodeDetailsInExceptionMessages) return NULL;
550
551 oop exc = JNIHandles::resolve_non_null(throwable);
552
553 Method* method;
554 int bci;
555 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
556 return NULL;
557 }
558 if (method->is_native()) {
559 return NULL;
560 }
561
562 stringStream ss;
563 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
564 if (ok) {
565 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
566 return (jstring) JNIHandles::make_local(env, result);
567 } else {
568 return NULL;
569 }
570 JVM_END
571
572 // java.lang.StackTraceElement //////////////////////////////////////////////
573
574
575 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
576 JVMWrapper("JVM_InitStackTraceElementArray");
577 Handle exception(THREAD, JNIHandles::resolve(throwable));
578 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
579 objArrayHandle stack_trace(THREAD, st);
580 // Fill in the allocated stack trace
581 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
582 JVM_END
583
584
585 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
586 JVMWrapper("JVM_InitStackTraceElement");
587 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
588 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
589 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
590 JVM_END
591
592
593 // java.lang.StackWalker //////////////////////////////////////////////////////
594
595
596 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
597 jint skip_frames, jint frame_count, jint start_index,
598 jobjectArray frames))
599 JVMWrapper("JVM_CallStackWalk");
600 JavaThread* jt = (JavaThread*) THREAD;
601 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
602 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
603 }
604
605 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
606
607 // frames array is a Class<?>[] array when only getting caller reference,
608 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
609 // be null.
610 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
611 objArrayHandle frames_array_h(THREAD, fa);
612
613 int limit = start_index + frame_count;
614 if (frames_array_h->length() < limit) {
615 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
616 }
617
618 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
619 start_index, frames_array_h, CHECK_NULL);
620 return JNIHandles::make_local(env, result);
621 JVM_END
622
623
624 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
625 jint frame_count, jint start_index,
626 jobjectArray frames))
627 JVMWrapper("JVM_MoreStackWalk");
628 JavaThread* jt = (JavaThread*) THREAD;
629
630 // frames array is a Class<?>[] array when only getting caller reference,
631 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
632 // be null.
633 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
634 objArrayHandle frames_array_h(THREAD, fa);
635
636 int limit = start_index+frame_count;
637 if (frames_array_h->length() < limit) {
638 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
639 }
640
641 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
642 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
643 start_index, frames_array_h, THREAD);
644 JVM_END
645
646 // java.lang.Object ///////////////////////////////////////////////
647
648
649 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
650 JVMWrapper("JVM_IHashCode");
651 // as implemented in the classic virtual machine; return 0 if object is NULL
652 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
653 JVM_END
654
655
656 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
657 JVMWrapper("JVM_MonitorWait");
658 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
659 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
660 if (JvmtiExport::should_post_monitor_wait()) {
661 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
662
663 // The current thread already owns the monitor and it has not yet
664 // been added to the wait queue so the current thread cannot be
665 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
666 // event handler cannot accidentally consume an unpark() meant for
667 // the ParkEvent associated with this ObjectMonitor.
668 }
669 ObjectSynchronizer::wait(obj, ms, CHECK);
670 JVM_END
671
672
673 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
674 JVMWrapper("JVM_MonitorNotify");
675 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
676 ObjectSynchronizer::notify(obj, CHECK);
677 JVM_END
678
679
680 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
681 JVMWrapper("JVM_MonitorNotifyAll");
682 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
683 ObjectSynchronizer::notifyall(obj, CHECK);
684 JVM_END
685
686
687 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
688 JVMWrapper("JVM_Clone");
689 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
690 Klass* klass = obj->klass();
691 JvmtiVMObjectAllocEventCollector oam;
692
693 #ifdef ASSERT
694 // Just checking that the cloneable flag is set correct
695 if (obj->is_array()) {
696 guarantee(klass->is_cloneable(), "all arrays are cloneable");
697 } else {
698 guarantee(obj->is_instance(), "should be instanceOop");
699 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
700 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
701 }
702 #endif
703
704 // Check if class of obj supports the Cloneable interface.
705 // All arrays are considered to be cloneable (See JLS 20.1.5).
706 // All j.l.r.Reference classes are considered non-cloneable.
707 if (!klass->is_cloneable() ||
708 (klass->is_instance_klass() &&
709 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
710 ResourceMark rm(THREAD);
711 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
712 }
713
714 // Make shallow object copy
715 const int size = obj->size();
716 oop new_obj_oop = NULL;
717 if (obj->is_array()) {
718 const int length = ((arrayOop)obj())->length();
719 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
720 /* do_zero */ true, CHECK_NULL);
721 } else {
722 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
723 }
724
725 HeapAccess<>::clone(obj(), new_obj_oop, size);
726
727 Handle new_obj(THREAD, new_obj_oop);
728 // Caution: this involves a java upcall, so the clone should be
729 // "gc-robust" by this stage.
730 if (klass->has_finalizer()) {
731 assert(obj->is_instance(), "should be instanceOop");
732 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
733 new_obj = Handle(THREAD, new_obj_oop);
734 }
735
736 return JNIHandles::make_local(env, new_obj());
737 JVM_END
738
739 // java.io.File ///////////////////////////////////////////////////////////////
740
741 JVM_LEAF(char*, JVM_NativePath(char* path))
742 JVMWrapper("JVM_NativePath");
743 return os::native_path(path);
744 JVM_END
745
746
747 // Misc. class handling ///////////////////////////////////////////////////////////
748
749
750 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
751 JVMWrapper("JVM_GetCallerClass");
752
753 // Getting the class of the caller frame.
754 //
755 // The call stack at this point looks something like this:
756 //
757 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
758 // [1] [ @CallerSensitive API.method ]
759 // [.] [ (skipped intermediate frames) ]
760 // [n] [ caller ]
761 vframeStream vfst(thread);
762 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
763 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
764 Method* m = vfst.method();
765 assert(m != NULL, "sanity");
766 switch (n) {
767 case 0:
768 // This must only be called from Reflection.getCallerClass
769 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
770 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
771 }
772 // fall-through
773 case 1:
774 // Frame 0 and 1 must be caller sensitive.
775 if (!m->caller_sensitive()) {
776 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
777 }
778 break;
779 default:
780 if (!m->is_ignored_by_security_stack_walk()) {
781 // We have reached the desired frame; return the holder class.
782 return (jclass) JNIHandles::make_local(env, m->method_holder()->java_mirror());
783 }
784 break;
785 }
786 }
787 return NULL;
788 JVM_END
789
790
791 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
792 JVMWrapper("JVM_FindPrimitiveClass");
793 oop mirror = NULL;
794 BasicType t = name2type(utf);
795 if (t != T_ILLEGAL && !is_reference_type(t)) {
796 mirror = Universe::java_mirror(t);
797 }
798 if (mirror == NULL) {
799 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
800 } else {
801 return (jclass) JNIHandles::make_local(env, mirror);
802 }
803 JVM_END
804
805
806 // Returns a class loaded by the bootstrap class loader; or null
807 // if not found. ClassNotFoundException is not thrown.
808 // FindClassFromBootLoader is exported to the launcher for windows.
809 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
810 const char* name))
811 JVMWrapper("JVM_FindClassFromBootLoader");
812
813 // Java libraries should ensure that name is never null or illegal.
814 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
815 // It's impossible to create this class; the name cannot fit
816 // into the constant pool.
817 return NULL;
818 }
819 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
820
821 TempNewSymbol h_name = SymbolTable::new_symbol(name);
822 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
823 if (k == NULL) {
824 return NULL;
825 }
826
827 if (log_is_enabled(Debug, class, resolve)) {
828 trace_class_resolution(k);
829 }
830 return (jclass) JNIHandles::make_local(env, k->java_mirror());
831 JVM_END
832
833 // Find a class with this name in this loader, using the caller's protection domain.
834 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
835 jboolean init, jobject loader,
836 jclass caller))
837 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
838
839 TempNewSymbol h_name =
840 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
841 CHECK_NULL);
842
843 oop loader_oop = JNIHandles::resolve(loader);
844 oop from_class = JNIHandles::resolve(caller);
845 oop protection_domain = NULL;
846 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
847 // NPE. Put it in another way, the bootstrap class loader has all permission and
848 // thus no checkPackageAccess equivalence in the VM class loader.
849 // The caller is also passed as NULL by the java code if there is no security
850 // manager to avoid the performance cost of getting the calling class.
851 if (from_class != NULL && loader_oop != NULL) {
852 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
853 }
854
855 Handle h_loader(THREAD, loader_oop);
856 Handle h_prot(THREAD, protection_domain);
857 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
858 h_prot, false, THREAD);
859
860 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
861 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
862 }
863 return result;
864 JVM_END
865
866 // Currently only called from the old verifier.
867 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
868 jboolean init, jclass from))
869 JVMWrapper("JVM_FindClassFromClass");
870 TempNewSymbol h_name =
871 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
872 CHECK_NULL);
873 oop from_class_oop = JNIHandles::resolve(from);
874 Klass* from_class = (from_class_oop == NULL)
875 ? (Klass*)NULL
876 : java_lang_Class::as_Klass(from_class_oop);
877 oop class_loader = NULL;
878 oop protection_domain = NULL;
879 if (from_class != NULL) {
880 class_loader = from_class->class_loader();
881 protection_domain = from_class->protection_domain();
882 }
883 Handle h_loader(THREAD, class_loader);
884 Handle h_prot (THREAD, protection_domain);
885 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
886 h_prot, true, thread);
887
888 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
889 // this function is generally only used for class loading during verification.
890 ResourceMark rm;
891 oop from_mirror = JNIHandles::resolve_non_null(from);
892 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
893 const char * from_name = from_class->external_name();
894
895 oop mirror = JNIHandles::resolve_non_null(result);
896 Klass* to_class = java_lang_Class::as_Klass(mirror);
897 const char * to = to_class->external_name();
898 log_debug(class, resolve)("%s %s (verification)", from_name, to);
899 }
900
901 return result;
902 JVM_END
903
904 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
905 if (loader.is_null()) {
906 return;
907 }
908
909 // check whether the current caller thread holds the lock or not.
910 // If not, increment the corresponding counter
911 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
912 ObjectSynchronizer::owner_self) {
913 counter->inc();
914 }
915 }
916
917 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
918 static jclass jvm_define_class_common(JNIEnv *env, const char *name,
919 jobject loader, const jbyte *buf,
920 jsize len, jobject pd, const char *source,
921 TRAPS) {
922 if (source == NULL) source = "__JVM_DefineClass__";
923
924 assert(THREAD->is_Java_thread(), "must be a JavaThread");
925 JavaThread* jt = (JavaThread*) THREAD;
926
927 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
928 ClassLoader::perf_define_appclass_selftime(),
929 ClassLoader::perf_define_appclasses(),
930 jt->get_thread_stat()->perf_recursion_counts_addr(),
931 jt->get_thread_stat()->perf_timers_addr(),
932 PerfClassTraceTime::DEFINE_CLASS);
933
934 if (UsePerfData) {
935 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
936 }
937
938 // Class resolution will get the class name from the .class stream if the name is null.
939 TempNewSymbol class_name = name == NULL ? NULL :
940 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
941 CHECK_NULL);
942
943 ResourceMark rm(THREAD);
944 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
945 Handle class_loader (THREAD, JNIHandles::resolve(loader));
946 if (UsePerfData) {
947 is_lock_held_by_thread(class_loader,
948 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
949 THREAD);
950 }
951 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
952 Klass* k = SystemDictionary::resolve_from_stream(class_name,
953 class_loader,
954 protection_domain,
955 &st,
956 CHECK_NULL);
957
958 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
959 trace_class_resolution(k);
960 }
961
962 return (jclass) JNIHandles::make_local(env, k->java_mirror());
963 }
964
965 enum {
966 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
967 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
968 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
969 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
970 };
971
972 /*
973 * Define a class with the specified flags that indicates if it's a nestmate,
974 * hidden, or strongly referenced from class loader.
975 */
976 static jclass jvm_lookup_define_class(JNIEnv *env, jclass lookup, const char *name,
977 const jbyte *buf, jsize len, jobject pd,
978 jboolean init, int flags, jobject classData, TRAPS) {
979 assert(THREAD->is_Java_thread(), "must be a JavaThread");
980 JavaThread* jt = (JavaThread*) THREAD;
981 ResourceMark rm(THREAD);
982
983 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
984 // Lookup class must be a non-null instance
985 if (lookup_k == NULL) {
986 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
987 }
988 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
989
990 Handle class_loader (THREAD, lookup_k->class_loader());
991
992 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
993 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
994 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
995 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
996
997 InstanceKlass* host_class = NULL;
998 if (is_nestmate) {
999 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1000 }
1001
1002 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1003 name,
1004 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1005 is_nestmate ? host_class->external_name() : "",
1006 is_hidden ? "hidden" : "not hidden",
1007 is_strong ? "strong" : "weak",
1008 vm_annotations ? "with vm annotations" : "without vm annotation");
1009
1010 if (!is_hidden) {
1011 // classData is only applicable for hidden classes
1012 if (classData != NULL) {
1013 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1014 }
1015 if (is_nestmate) {
1016 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1017 }
1018 if (!is_strong) {
1019 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1020 }
1021 if (vm_annotations) {
1022 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1023 }
1024 if (flags != STRONG_LOADER_LINK) {
1025 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1026 err_msg("invalid flag 0x%x", flags));
1027 }
1028 }
1029
1030 // Class resolution will get the class name from the .class stream if the name is null.
1031 TempNewSymbol class_name = name == NULL ? NULL :
1032 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1033 CHECK_NULL);
1034
1035 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1036 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1037 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1038
1039 Klass* defined_k;
1040 InstanceKlass* ik = NULL;
1041 if (!is_hidden) {
1042 defined_k = SystemDictionary::resolve_from_stream(class_name,
1043 class_loader,
1044 protection_domain,
1045 &st,
1046 CHECK_NULL);
1047
1048 if (log_is_enabled(Debug, class, resolve) && defined_k != NULL) {
1049 trace_class_resolution(defined_k);
1050 }
1051 ik = InstanceKlass::cast(defined_k);
1052 } else { // hidden
1053 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1054 ClassLoadInfo cl_info(protection_domain,
1055 NULL, // unsafe_anonymous_host
1056 NULL, // cp_patches
1057 host_class,
1058 classData_h,
1059 is_hidden,
1060 is_strong,
1061 vm_annotations);
1062 defined_k = SystemDictionary::parse_stream(class_name,
1063 class_loader,
1064 &st,
1065 cl_info,
1066 CHECK_NULL);
1067 if (defined_k == NULL) {
1068 THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a hidden class");
1069 }
1070
1071 ik = InstanceKlass::cast(defined_k);
1072
1073 // The hidden class loader data has been artificially been kept alive to
1074 // this point. The mirror and any instances of this class have to keep
1075 // it alive afterwards.
1076 ik->class_loader_data()->dec_keep_alive();
1077
1078 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1079 ModuleEntry* module = ik->module();
1080 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1081 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1082 module_name,
1083 ik->external_name(),
1084 host_class->external_name(),
1085 ik->is_hidden() ? "is hidden" : "is not hidden");
1086 }
1087 }
1088 assert(Reflection::is_same_class_package(lookup_k, defined_k),
1089 "lookup class and defined class are in different packages");
1090
1091 if (init) {
1092 ik->initialize(CHECK_NULL);
1093 } else {
1094 ik->link_class(CHECK_NULL);
1095 }
1096
1097 return (jclass) JNIHandles::make_local(env, defined_k->java_mirror());
1098 }
1099
1100 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1101 JVMWrapper("JVM_DefineClass");
1102
1103 return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
1104 JVM_END
1105
1106 /*
1107 * Define a class with the specified lookup class.
1108 * lookup: Lookup class
1109 * name: the name of the class
1110 * buf: class bytes
1111 * len: length of class bytes
1112 * pd: protection domain
1113 * init: initialize the class
1114 * flags: properties of the class
1115 * classData: private static pre-initialized field
1116 */
1117 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1118 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1119 JVMWrapper("JVM_LookupDefineClass");
1120
1121 if (lookup == NULL) {
1122 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1123 }
1124
1125 assert(buf != NULL, "buf must not be NULL");
1126
1127 return jvm_lookup_define_class(env, lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1128 JVM_END
1129
1130 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1131 JVMWrapper("JVM_DefineClassWithSource");
1132
1133 return jvm_define_class_common(env, name, loader, buf, len, pd, source, THREAD);
1134 JVM_END
1135
1136 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1137 JVMWrapper("JVM_FindLoadedClass");
1138 ResourceMark rm(THREAD);
1139
1140 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1141 char* str = java_lang_String::as_utf8_string(h_name());
1142
1143 // Sanity check, don't expect null
1144 if (str == NULL) return NULL;
1145
1146 // Internalize the string, converting '.' to '/' in string.
1147 char* p = (char*)str;
1148 while (*p != '\0') {
1149 if (*p == '.') {
1150 *p = '/';
1151 }
1152 p++;
1153 }
1154
1155 const int str_len = (int)(p - str);
1156 if (str_len > Symbol::max_length()) {
1157 // It's impossible to create this class; the name cannot fit
1158 // into the constant pool.
1159 return NULL;
1160 }
1161 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1162
1163 // Security Note:
1164 // The Java level wrapper will perform the necessary security check allowing
1165 // us to pass the NULL as the initiating class loader.
1166 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1167 if (UsePerfData) {
1168 is_lock_held_by_thread(h_loader,
1169 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1170 THREAD);
1171 }
1172
1173 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1174 h_loader,
1175 Handle(),
1176 CHECK_NULL);
1177 #if INCLUDE_CDS
1178 if (k == NULL) {
1179 // If the class is not already loaded, try to see if it's in the shared
1180 // archive for the current classloader (h_loader).
1181 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1182 }
1183 #endif
1184 return (k == NULL) ? NULL :
1185 (jclass) JNIHandles::make_local(env, k->java_mirror());
1186 JVM_END
1187
1188 // Module support //////////////////////////////////////////////////////////////////////////////
1189
1190 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1191 jstring location, jobjectArray packages))
1192 JVMWrapper("JVM_DefineModule");
1193 Modules::define_module(module, is_open, version, location, packages, CHECK);
1194 JVM_END
1195
1196 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1197 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1198 Modules::set_bootloader_unnamed_module(module, CHECK);
1199 JVM_END
1200
1201 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1202 JVMWrapper("JVM_AddModuleExports");
1203 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1204 JVM_END
1205
1206 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1207 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1208 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1209 JVM_END
1210
1211 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1212 JVMWrapper("JVM_AddModuleExportsToAll");
1213 Modules::add_module_exports(from_module, package, NULL, CHECK);
1214 JVM_END
1215
1216 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1217 JVMWrapper("JVM_AddReadsModule");
1218 Modules::add_reads_module(from_module, source_module, CHECK);
1219 JVM_END
1220
1221 // Reflection support //////////////////////////////////////////////////////////////////////////////
1222
1223 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1224 assert (cls != NULL, "illegal class");
1225 JVMWrapper("JVM_InitClassName");
1226 JvmtiVMObjectAllocEventCollector oam;
1227 ResourceMark rm(THREAD);
1228 HandleMark hm(THREAD);
1229 Handle java_class(THREAD, JNIHandles::resolve(cls));
1230 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1231 return (jstring) JNIHandles::make_local(env, result);
1232 JVM_END
1233
1234
1235 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1236 JVMWrapper("JVM_GetClassInterfaces");
1237 JvmtiVMObjectAllocEventCollector oam;
1238 oop mirror = JNIHandles::resolve_non_null(cls);
1239
1240 // Special handling for primitive objects
1241 if (java_lang_Class::is_primitive(mirror)) {
1242 // Primitive objects does not have any interfaces
1243 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1244 return (jobjectArray) JNIHandles::make_local(env, r);
1245 }
1246
1247 Klass* klass = java_lang_Class::as_Klass(mirror);
1248 // Figure size of result array
1249 int size;
1250 if (klass->is_instance_klass()) {
1251 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1252 } else {
1253 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1254 size = 2;
1255 }
1256
1257 // Allocate result array
1258 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1259 objArrayHandle result (THREAD, r);
1260 // Fill in result
1261 if (klass->is_instance_klass()) {
1262 // Regular instance klass, fill in all local interfaces
1263 for (int index = 0; index < size; index++) {
1264 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1265 result->obj_at_put(index, k->java_mirror());
1266 }
1267 } else {
1268 // All arrays implement java.lang.Cloneable and java.io.Serializable
1269 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1270 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1271 }
1272 return (jobjectArray) JNIHandles::make_local(env, result());
1273 JVM_END
1274
1275
1276 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1277 JVMWrapper("JVM_IsInterface");
1278 oop mirror = JNIHandles::resolve_non_null(cls);
1279 if (java_lang_Class::is_primitive(mirror)) {
1280 return JNI_FALSE;
1281 }
1282 Klass* k = java_lang_Class::as_Klass(mirror);
1283 jboolean result = k->is_interface();
1284 assert(!result || k->is_instance_klass(),
1285 "all interfaces are instance types");
1286 // The compiler intrinsic for isInterface tests the
1287 // Klass::_access_flags bits in the same way.
1288 return result;
1289 JVM_END
1290
1291 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1292 JVMWrapper("JVM_IsHiddenClass");
1293 oop mirror = JNIHandles::resolve_non_null(cls);
1294 if (java_lang_Class::is_primitive(mirror)) {
1295 return JNI_FALSE;
1296 }
1297 Klass* k = java_lang_Class::as_Klass(mirror);
1298 return k->is_hidden();
1299 JVM_END
1300
1301 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1302 JVMWrapper("JVM_GetClassSigners");
1303 JvmtiVMObjectAllocEventCollector oam;
1304 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1305 // There are no signers for primitive types
1306 return NULL;
1307 }
1308
1309 objArrayHandle signers(THREAD, java_lang_Class::signers(JNIHandles::resolve_non_null(cls)));
1310
1311 // If there are no signers set in the class, or if the class
1312 // is an array, return NULL.
1313 if (signers == NULL) return NULL;
1314
1315 // copy of the signers array
1316 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1317 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1318 for (int index = 0; index < signers->length(); index++) {
1319 signers_copy->obj_at_put(index, signers->obj_at(index));
1320 }
1321
1322 // return the copy
1323 return (jobjectArray) JNIHandles::make_local(env, signers_copy);
1324 JVM_END
1325
1326
1327 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1328 JVMWrapper("JVM_SetClassSigners");
1329 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1330 // This call is ignored for primitive types and arrays.
1331 // Signers are only set once, ClassLoader.java, and thus shouldn't
1332 // be called with an array. Only the bootstrap loader creates arrays.
1333 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1334 if (k->is_instance_klass()) {
1335 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1336 }
1337 }
1338 JVM_END
1339
1340
1341 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1342 JVMWrapper("JVM_GetProtectionDomain");
1343 if (JNIHandles::resolve(cls) == NULL) {
1344 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1345 }
1346
1347 if (java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1348 // Primitive types does not have a protection domain.
1349 return NULL;
1350 }
1351
1352 oop pd = java_lang_Class::protection_domain(JNIHandles::resolve(cls));
1353 return (jobject) JNIHandles::make_local(env, pd);
1354 JVM_END
1355
1356
1357 // Returns the inherited_access_control_context field of the running thread.
1358 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1359 JVMWrapper("JVM_GetInheritedAccessControlContext");
1360 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1361 return JNIHandles::make_local(env, result);
1362 JVM_END
1363
1364 class RegisterArrayForGC {
1365 private:
1366 JavaThread *_thread;
1367 public:
1368 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1369 _thread = thread;
1370 _thread->register_array_for_gc(array);
1371 }
1372
1373 ~RegisterArrayForGC() {
1374 _thread->register_array_for_gc(NULL);
1375 }
1376 };
1377
1378
1379 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1380 JVMWrapper("JVM_GetStackAccessControlContext");
1381 if (!UsePrivilegedStack) return NULL;
1382
1383 ResourceMark rm(THREAD);
1384 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1385 JvmtiVMObjectAllocEventCollector oam;
1386
1387 // count the protection domains on the execution stack. We collapse
1388 // duplicate consecutive protection domains into a single one, as
1389 // well as stopping when we hit a privileged frame.
1390
1391 oop previous_protection_domain = NULL;
1392 Handle privileged_context(thread, NULL);
1393 bool is_privileged = false;
1394 oop protection_domain = NULL;
1395
1396 // Iterate through Java frames
1397 vframeStream vfst(thread);
1398 for(; !vfst.at_end(); vfst.next()) {
1399 // get method of frame
1400 Method* method = vfst.method();
1401
1402 // stop at the first privileged frame
1403 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1404 method->name() == vmSymbols::executePrivileged_name())
1405 {
1406 // this frame is privileged
1407 is_privileged = true;
1408
1409 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1410
1411 StackValueCollection* locals = priv->locals();
1412 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1413 StackValue* clr_sv = locals->at(2); // Class<?> caller
1414 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1415 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1416 privileged_context = ctx_sv->get_obj();
1417 Handle caller = clr_sv->get_obj();
1418
1419 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1420 protection_domain = caller_klass->protection_domain();
1421 } else {
1422 protection_domain = method->method_holder()->protection_domain();
1423 }
1424
1425 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1426 local_array->push(protection_domain);
1427 previous_protection_domain = protection_domain;
1428 }
1429
1430 if (is_privileged) break;
1431 }
1432
1433
1434 // either all the domains on the stack were system domains, or
1435 // we had a privileged system domain
1436 if (local_array->is_empty()) {
1437 if (is_privileged && privileged_context.is_null()) return NULL;
1438
1439 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1440 return JNIHandles::make_local(env, result);
1441 }
1442
1443 // the resource area must be registered in case of a gc
1444 RegisterArrayForGC ragc(thread, local_array);
1445 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1446 local_array->length(), CHECK_NULL);
1447 objArrayHandle h_context(thread, context);
1448 for (int index = 0; index < local_array->length(); index++) {
1449 h_context->obj_at_put(index, local_array->at(index));
1450 }
1451
1452 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1453
1454 return JNIHandles::make_local(env, result);
1455 JVM_END
1456
1457
1458 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1459 JVMWrapper("JVM_IsArrayClass");
1460 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1461 return (k != NULL) && k->is_array_klass() ? true : false;
1462 JVM_END
1463
1464
1465 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1466 JVMWrapper("JVM_IsPrimitiveClass");
1467 oop mirror = JNIHandles::resolve_non_null(cls);
1468 return (jboolean) java_lang_Class::is_primitive(mirror);
1469 JVM_END
1470
1471
1472 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1473 JVMWrapper("JVM_GetClassModifiers");
1474 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1475 // Primitive type
1476 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1477 }
1478
1479 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1480 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1481 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1482 return k->modifier_flags();
1483 JVM_END
1484
1485
1486 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1487
1488 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1489 JvmtiVMObjectAllocEventCollector oam;
1490 // ofClass is a reference to a java_lang_Class object. The mirror object
1491 // of an InstanceKlass
1492
1493 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1494 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1495 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1496 return (jobjectArray)JNIHandles::make_local(env, result);
1497 }
1498
1499 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1500 InnerClassesIterator iter(k);
1501
1502 if (iter.length() == 0) {
1503 // Neither an inner nor outer class
1504 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1505 return (jobjectArray)JNIHandles::make_local(env, result);
1506 }
1507
1508 // find inner class info
1509 constantPoolHandle cp(thread, k->constants());
1510 int length = iter.length();
1511
1512 // Allocate temp. result array
1513 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1514 objArrayHandle result (THREAD, r);
1515 int members = 0;
1516
1517 for (; !iter.done(); iter.next()) {
1518 int ioff = iter.inner_class_info_index();
1519 int ooff = iter.outer_class_info_index();
1520
1521 if (ioff != 0 && ooff != 0) {
1522 // Check to see if the name matches the class we're looking for
1523 // before attempting to find the class.
1524 if (cp->klass_name_at_matches(k, ooff)) {
1525 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1526 if (outer_klass == k) {
1527 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1528 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1529
1530 // Throws an exception if outer klass has not declared k as
1531 // an inner klass
1532 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1533
1534 result->obj_at_put(members, inner_klass->java_mirror());
1535 members++;
1536 }
1537 }
1538 }
1539 }
1540
1541 if (members != length) {
1542 // Return array of right length
1543 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1544 for(int i = 0; i < members; i++) {
1545 res->obj_at_put(i, result->obj_at(i));
1546 }
1547 return (jobjectArray)JNIHandles::make_local(env, res);
1548 }
1549
1550 return (jobjectArray)JNIHandles::make_local(env, result());
1551 JVM_END
1552
1553
1554 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1555 {
1556 // ofClass is a reference to a java_lang_Class object.
1557 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1558 ! java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_instance_klass()) {
1559 return NULL;
1560 }
1561
1562 bool inner_is_member = false;
1563 Klass* outer_klass
1564 = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))
1565 )->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1566 if (outer_klass == NULL) return NULL; // already a top-level class
1567 if (!inner_is_member) return NULL; // a hidden or unsafe anonymous class (inside a method)
1568 return (jclass) JNIHandles::make_local(env, outer_klass->java_mirror());
1569 }
1570 JVM_END
1571
1572 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1573 {
1574 oop mirror = JNIHandles::resolve_non_null(cls);
1575 if (java_lang_Class::is_primitive(mirror) ||
1576 !java_lang_Class::as_Klass(mirror)->is_instance_klass()) {
1577 return NULL;
1578 }
1579 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(mirror));
1580 int ooff = 0, noff = 0;
1581 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1582 if (noff != 0) {
1583 constantPoolHandle i_cp(thread, k->constants());
1584 Symbol* name = i_cp->symbol_at(noff);
1585 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1586 return (jstring) JNIHandles::make_local(env, str());
1587 }
1588 }
1589 return NULL;
1590 }
1591 JVM_END
1592
1593 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1594 assert (cls != NULL, "illegal class");
1595 JVMWrapper("JVM_GetClassSignature");
1596 JvmtiVMObjectAllocEventCollector oam;
1597 ResourceMark rm(THREAD);
1598 // Return null for arrays and primatives
1599 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1600 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1601 if (k->is_instance_klass()) {
1602 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1603 if (sym == NULL) return NULL;
1604 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1605 return (jstring) JNIHandles::make_local(env, str());
1606 }
1607 }
1608 return NULL;
1609 JVM_END
1610
1611
1612 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1613 assert (cls != NULL, "illegal class");
1614 JVMWrapper("JVM_GetClassAnnotations");
1615
1616 // Return null for arrays and primitives
1617 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1618 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1619 if (k->is_instance_klass()) {
1620 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1621 return (jbyteArray) JNIHandles::make_local(env, a);
1622 }
1623 }
1624 return NULL;
1625 JVM_END
1626
1627
1628 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1629 // some of this code was adapted from from jni_FromReflectedField
1630
1631 oop reflected = JNIHandles::resolve_non_null(field);
1632 oop mirror = java_lang_reflect_Field::clazz(reflected);
1633 Klass* k = java_lang_Class::as_Klass(mirror);
1634 int slot = java_lang_reflect_Field::slot(reflected);
1635 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1636
1637 InstanceKlass* ik = InstanceKlass::cast(k);
1638 intptr_t offset = ik->field_offset(slot);
1639
1640 if (modifiers & JVM_ACC_STATIC) {
1641 // for static fields we only look in the current class
1642 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1643 assert(false, "cannot find static field");
1644 return false;
1645 }
1646 } else {
1647 // for instance fields we start with the current class and work
1648 // our way up through the superclass chain
1649 if (!ik->find_field_from_offset(offset, false, &fd)) {
1650 assert(false, "cannot find instance field");
1651 return false;
1652 }
1653 }
1654 return true;
1655 }
1656
1657 static Method* jvm_get_method_common(jobject method) {
1658 // some of this code was adapted from from jni_FromReflectedMethod
1659
1660 oop reflected = JNIHandles::resolve_non_null(method);
1661 oop mirror = NULL;
1662 int slot = 0;
1663
1664 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1665 mirror = java_lang_reflect_Constructor::clazz(reflected);
1666 slot = java_lang_reflect_Constructor::slot(reflected);
1667 } else {
1668 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1669 "wrong type");
1670 mirror = java_lang_reflect_Method::clazz(reflected);
1671 slot = java_lang_reflect_Method::slot(reflected);
1672 }
1673 Klass* k = java_lang_Class::as_Klass(mirror);
1674
1675 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1676 assert(m != NULL, "cannot find method");
1677 return m; // caller has to deal with NULL in product mode
1678 }
1679
1680 /* Type use annotations support (JDK 1.8) */
1681
1682 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1683 assert (cls != NULL, "illegal class");
1684 JVMWrapper("JVM_GetClassTypeAnnotations");
1685 ResourceMark rm(THREAD);
1686 // Return null for arrays and primitives
1687 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1688 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1689 if (k->is_instance_klass()) {
1690 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1691 if (type_annotations != NULL) {
1692 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1693 return (jbyteArray) JNIHandles::make_local(env, a);
1694 }
1695 }
1696 }
1697 return NULL;
1698 JVM_END
1699
1700 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1701 assert (method != NULL, "illegal method");
1702 JVMWrapper("JVM_GetMethodTypeAnnotations");
1703
1704 // method is a handle to a java.lang.reflect.Method object
1705 Method* m = jvm_get_method_common(method);
1706 if (m == NULL) {
1707 return NULL;
1708 }
1709
1710 AnnotationArray* type_annotations = m->type_annotations();
1711 if (type_annotations != NULL) {
1712 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1713 return (jbyteArray) JNIHandles::make_local(env, a);
1714 }
1715
1716 return NULL;
1717 JVM_END
1718
1719 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1720 assert (field != NULL, "illegal field");
1721 JVMWrapper("JVM_GetFieldTypeAnnotations");
1722
1723 fieldDescriptor fd;
1724 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1725 if (!gotFd) {
1726 return NULL;
1727 }
1728
1729 return (jbyteArray) JNIHandles::make_local(env, Annotations::make_java_array(fd.type_annotations(), THREAD));
1730 JVM_END
1731
1732 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1733 if (!cp->is_within_bounds(index)) {
1734 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1735 }
1736 }
1737
1738 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1739 {
1740 JVMWrapper("JVM_GetMethodParameters");
1741 // method is a handle to a java.lang.reflect.Method object
1742 Method* method_ptr = jvm_get_method_common(method);
1743 methodHandle mh (THREAD, method_ptr);
1744 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1745 const int num_params = mh->method_parameters_length();
1746
1747 if (num_params < 0) {
1748 // A -1 return value from method_parameters_length means there is no
1749 // parameter data. Return null to indicate this to the reflection
1750 // API.
1751 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1752 return (jobjectArray)NULL;
1753 } else {
1754 // Otherwise, we return something up to reflection, even if it is
1755 // a zero-length array. Why? Because in some cases this can
1756 // trigger a MalformedParametersException.
1757
1758 // make sure all the symbols are properly formatted
1759 for (int i = 0; i < num_params; i++) {
1760 MethodParametersElement* params = mh->method_parameters_start();
1761 int index = params[i].name_cp_index;
1762 constantPoolHandle cp(THREAD, mh->constants());
1763 bounds_check(cp, index, CHECK_NULL);
1764
1765 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1766 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1767 "Wrong type at constant pool index");
1768 }
1769
1770 }
1771
1772 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1773 objArrayHandle result (THREAD, result_oop);
1774
1775 for (int i = 0; i < num_params; i++) {
1776 MethodParametersElement* params = mh->method_parameters_start();
1777 // For a 0 index, give a NULL symbol
1778 Symbol* sym = 0 != params[i].name_cp_index ?
1779 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1780 int flags = params[i].flags;
1781 oop param = Reflection::new_parameter(reflected_method, i, sym,
1782 flags, CHECK_NULL);
1783 result->obj_at_put(i, param);
1784 }
1785 return (jobjectArray)JNIHandles::make_local(env, result());
1786 }
1787 }
1788 JVM_END
1789
1790 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1791
1792 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1793 {
1794 JVMWrapper("JVM_GetClassDeclaredFields");
1795 JvmtiVMObjectAllocEventCollector oam;
1796
1797 // Exclude primitive types and array types
1798 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass)) ||
1799 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1800 // Return empty array
1801 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1802 return (jobjectArray) JNIHandles::make_local(env, res);
1803 }
1804
1805 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1806 constantPoolHandle cp(THREAD, k->constants());
1807
1808 // Ensure class is linked
1809 k->link_class(CHECK_NULL);
1810
1811 // Allocate result
1812 int num_fields;
1813
1814 if (publicOnly) {
1815 num_fields = 0;
1816 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1817 if (fs.access_flags().is_public()) ++num_fields;
1818 }
1819 } else {
1820 num_fields = k->java_fields_count();
1821 }
1822
1823 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1824 objArrayHandle result (THREAD, r);
1825
1826 int out_idx = 0;
1827 fieldDescriptor fd;
1828 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1829 if (!publicOnly || fs.access_flags().is_public()) {
1830 fd.reinitialize(k, fs.index());
1831 oop field = Reflection::new_field(&fd, CHECK_NULL);
1832 result->obj_at_put(out_idx, field);
1833 ++out_idx;
1834 }
1835 }
1836 assert(out_idx == num_fields, "just checking");
1837 return (jobjectArray) JNIHandles::make_local(env, result());
1838 }
1839 JVM_END
1840
1841 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1842 {
1843 JVMWrapper("JVM_IsRecord");
1844 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1845 if (k != NULL && k->is_instance_klass()) {
1846 InstanceKlass* ik = InstanceKlass::cast(k);
1847 return ik->is_record();
1848 } else {
1849 return false;
1850 }
1851 }
1852 JVM_END
1853
1854 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1855 {
1856 JVMWrapper("JVM_GetRecordComponents");
1857 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1858 assert(c->is_instance_klass(), "must be");
1859 InstanceKlass* ik = InstanceKlass::cast(c);
1860
1861 if (ik->is_record()) {
1862 Array<RecordComponent*>* components = ik->record_components();
1863 assert(components != NULL, "components should not be NULL");
1864 {
1865 JvmtiVMObjectAllocEventCollector oam;
1866 constantPoolHandle cp(THREAD, ik->constants());
1867 int length = components->length();
1868 assert(length >= 0, "unexpected record_components length");
1869 objArrayOop record_components =
1870 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL);
1871 objArrayHandle components_h (THREAD, record_components);
1872
1873 for (int x = 0; x < length; x++) {
1874 RecordComponent* component = components->at(x);
1875 assert(component != NULL, "unexpected NULL record component");
1876 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1877 components_h->obj_at_put(x, component_oop);
1878 }
1879 return (jobjectArray)JNIHandles::make_local(components_h());
1880 }
1881 }
1882
1883 // Return empty array if ofClass is not a record.
1884 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL);
1885 return (jobjectArray)JNIHandles::make_local(env, result);
1886 }
1887 JVM_END
1888
1889 static bool select_method(const methodHandle& method, bool want_constructor) {
1890 if (want_constructor) {
1891 return (method->is_initializer() && !method->is_static());
1892 } else {
1893 return (!method->is_initializer() && !method->is_overpass());
1894 }
1895 }
1896
1897 static jobjectArray get_class_declared_methods_helper(
1898 JNIEnv *env,
1899 jclass ofClass, jboolean publicOnly,
1900 bool want_constructor,
1901 Klass* klass, TRAPS) {
1902
1903 JvmtiVMObjectAllocEventCollector oam;
1904
1905 // Exclude primitive types and array types
1906 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(ofClass))
1907 || java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass))->is_array_klass()) {
1908 // Return empty array
1909 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1910 return (jobjectArray) JNIHandles::make_local(env, res);
1911 }
1912
1913 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass)));
1914
1915 // Ensure class is linked
1916 k->link_class(CHECK_NULL);
1917
1918 Array<Method*>* methods = k->methods();
1919 int methods_length = methods->length();
1920
1921 // Save original method_idnum in case of redefinition, which can change
1922 // the idnum of obsolete methods. The new method will have the same idnum
1923 // but if we refresh the methods array, the counts will be wrong.
1924 ResourceMark rm(THREAD);
1925 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1926 int num_methods = 0;
1927
1928 for (int i = 0; i < methods_length; i++) {
1929 methodHandle method(THREAD, methods->at(i));
1930 if (select_method(method, want_constructor)) {
1931 if (!publicOnly || method->is_public()) {
1932 idnums->push(method->method_idnum());
1933 ++num_methods;
1934 }
1935 }
1936 }
1937
1938 // Allocate result
1939 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1940 objArrayHandle result (THREAD, r);
1941
1942 // Now just put the methods that we selected above, but go by their idnum
1943 // in case of redefinition. The methods can be redefined at any safepoint,
1944 // so above when allocating the oop array and below when creating reflect
1945 // objects.
1946 for (int i = 0; i < num_methods; i++) {
1947 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1948 if (method.is_null()) {
1949 // Method may have been deleted and seems this API can handle null
1950 // Otherwise should probably put a method that throws NSME
1951 result->obj_at_put(i, NULL);
1952 } else {
1953 oop m;
1954 if (want_constructor) {
1955 m = Reflection::new_constructor(method, CHECK_NULL);
1956 } else {
1957 m = Reflection::new_method(method, false, CHECK_NULL);
1958 }
1959 result->obj_at_put(i, m);
1960 }
1961 }
1962
1963 return (jobjectArray) JNIHandles::make_local(env, result());
1964 }
1965
1966 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1967 {
1968 JVMWrapper("JVM_GetClassDeclaredMethods");
1969 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1970 /*want_constructor*/ false,
1971 SystemDictionary::reflect_Method_klass(), THREAD);
1972 }
1973 JVM_END
1974
1975 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1976 {
1977 JVMWrapper("JVM_GetClassDeclaredConstructors");
1978 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1979 /*want_constructor*/ true,
1980 SystemDictionary::reflect_Constructor_klass(), THREAD);
1981 }
1982 JVM_END
1983
1984 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1985 {
1986 JVMWrapper("JVM_GetClassAccessFlags");
1987 if (java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
1988 // Primitive type
1989 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1990 }
1991
1992 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1993 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1994 }
1995 JVM_END
1996
1997 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1998 {
1999 JVMWrapper("JVM_AreNestMates");
2000 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2001 assert(c->is_instance_klass(), "must be");
2002 InstanceKlass* ck = InstanceKlass::cast(c);
2003 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2004 assert(m->is_instance_klass(), "must be");
2005 InstanceKlass* mk = InstanceKlass::cast(m);
2006 return ck->has_nestmate_access_to(mk, THREAD);
2007 }
2008 JVM_END
2009
2010 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2011 {
2012 // current is not a primitive or array class
2013 JVMWrapper("JVM_GetNestHost");
2014 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2015 assert(c->is_instance_klass(), "must be");
2016 InstanceKlass* ck = InstanceKlass::cast(c);
2017 InstanceKlass* host = ck->nest_host(THREAD);
2018 return (jclass) (host == NULL ? NULL :
2019 JNIHandles::make_local(THREAD, host->java_mirror()));
2020 }
2021 JVM_END
2022
2023 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2024 {
2025 // current is not a primitive or array class
2026 JVMWrapper("JVM_GetNestMembers");
2027 ResourceMark rm(THREAD);
2028 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2029 assert(c->is_instance_klass(), "must be");
2030 InstanceKlass* ck = InstanceKlass::cast(c);
2031 InstanceKlass* host = ck->nest_host(THREAD);
2032
2033 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2034 ck->external_name(), host->external_name());
2035 {
2036 JvmtiVMObjectAllocEventCollector oam;
2037 Array<u2>* members = host->nest_members();
2038 int length = members == NULL ? 0 : members->length();
2039
2040 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2041
2042 // nest host is first in the array so make it one bigger
2043 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2044 length + 1, CHECK_NULL);
2045 objArrayHandle result(THREAD, r);
2046 result->obj_at_put(0, host->java_mirror());
2047 if (length != 0) {
2048 int count = 0;
2049 for (int i = 0; i < length; i++) {
2050 int cp_index = members->at(i);
2051 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2052 if (HAS_PENDING_EXCEPTION) {
2053 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) {
2054 return NULL; // propagate VMEs
2055 }
2056 if (log_is_enabled(Trace, class, nestmates)) {
2057 stringStream ss;
2058 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2059 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2060 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2061 log_trace(class, nestmates)("%s", ss.as_string());
2062 }
2063 CLEAR_PENDING_EXCEPTION;
2064 continue;
2065 }
2066 if (k->is_instance_klass()) {
2067 InstanceKlass* ik = InstanceKlass::cast(k);
2068 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2069 if (nest_host_k == host) {
2070 result->obj_at_put(count+1, k->java_mirror());
2071 count++;
2072 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2073 } else {
2074 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2075 ik->external_name(), nest_host_k->external_name());
2076 }
2077 } else {
2078 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2079 k->external_name());
2080 }
2081 }
2082 if (count < length) {
2083 // we had invalid entries so we need to compact the array
2084 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2085 length + 1, count + 1);
2086
2087 objArrayOop r2 = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2088 count + 1, CHECK_NULL);
2089 objArrayHandle result2(THREAD, r2);
2090 for (int i = 0; i < count + 1; i++) {
2091 result2->obj_at_put(i, result->obj_at(i));
2092 }
2093 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2094 }
2095 }
2096 else {
2097 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2098 }
2099 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2100 }
2101 }
2102 JVM_END
2103
2104 // Constant pool access //////////////////////////////////////////////////////////
2105
2106 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2107 {
2108 JVMWrapper("JVM_GetClassConstantPool");
2109 JvmtiVMObjectAllocEventCollector oam;
2110
2111 // Return null for primitives and arrays
2112 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2113 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2114 if (k->is_instance_klass()) {
2115 InstanceKlass* k_h = InstanceKlass::cast(k);
2116 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2117 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2118 return JNIHandles::make_local(jcp());
2119 }
2120 }
2121 return NULL;
2122 }
2123 JVM_END
2124
2125
2126 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2127 {
2128 JVMWrapper("JVM_ConstantPoolGetSize");
2129 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2130 return cp->length();
2131 }
2132 JVM_END
2133
2134
2135 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2136 {
2137 JVMWrapper("JVM_ConstantPoolGetClassAt");
2138 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2139 bounds_check(cp, index, CHECK_NULL);
2140 constantTag tag = cp->tag_at(index);
2141 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2142 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2143 }
2144 Klass* k = cp->klass_at(index, CHECK_NULL);
2145 return (jclass) JNIHandles::make_local(k->java_mirror());
2146 }
2147 JVM_END
2148
2149 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2150 {
2151 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2152 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2153 bounds_check(cp, index, CHECK_NULL);
2154 constantTag tag = cp->tag_at(index);
2155 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2156 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2157 }
2158 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2159 if (k == NULL) return NULL;
2160 return (jclass) JNIHandles::make_local(k->java_mirror());
2161 }
2162 JVM_END
2163
2164 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2165 constantTag tag = cp->tag_at(index);
2166 if (!tag.is_method() && !tag.is_interface_method()) {
2167 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2168 }
2169 int klass_ref = cp->uncached_klass_ref_index_at(index);
2170 Klass* k_o;
2171 if (force_resolution) {
2172 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2173 } else {
2174 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2175 if (k_o == NULL) return NULL;
2176 }
2177 InstanceKlass* k = InstanceKlass::cast(k_o);
2178 Symbol* name = cp->uncached_name_ref_at(index);
2179 Symbol* sig = cp->uncached_signature_ref_at(index);
2180 methodHandle m (THREAD, k->find_method(name, sig));
2181 if (m.is_null()) {
2182 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2183 }
2184 oop method;
2185 if (!m->is_initializer() || m->is_static()) {
2186 method = Reflection::new_method(m, true, CHECK_NULL);
2187 } else {
2188 method = Reflection::new_constructor(m, CHECK_NULL);
2189 }
2190 return JNIHandles::make_local(method);
2191 }
2192
2193 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2194 {
2195 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2196 JvmtiVMObjectAllocEventCollector oam;
2197 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2198 bounds_check(cp, index, CHECK_NULL);
2199 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2200 return res;
2201 }
2202 JVM_END
2203
2204 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2205 {
2206 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2207 JvmtiVMObjectAllocEventCollector oam;
2208 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2209 bounds_check(cp, index, CHECK_NULL);
2210 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2211 return res;
2212 }
2213 JVM_END
2214
2215 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2216 constantTag tag = cp->tag_at(index);
2217 if (!tag.is_field()) {
2218 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2219 }
2220 int klass_ref = cp->uncached_klass_ref_index_at(index);
2221 Klass* k_o;
2222 if (force_resolution) {
2223 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2224 } else {
2225 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2226 if (k_o == NULL) return NULL;
2227 }
2228 InstanceKlass* k = InstanceKlass::cast(k_o);
2229 Symbol* name = cp->uncached_name_ref_at(index);
2230 Symbol* sig = cp->uncached_signature_ref_at(index);
2231 fieldDescriptor fd;
2232 Klass* target_klass = k->find_field(name, sig, &fd);
2233 if (target_klass == NULL) {
2234 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2235 }
2236 oop field = Reflection::new_field(&fd, CHECK_NULL);
2237 return JNIHandles::make_local(field);
2238 }
2239
2240 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2241 {
2242 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2243 JvmtiVMObjectAllocEventCollector oam;
2244 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2245 bounds_check(cp, index, CHECK_NULL);
2246 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2247 return res;
2248 }
2249 JVM_END
2250
2251 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2252 {
2253 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2254 JvmtiVMObjectAllocEventCollector oam;
2255 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2256 bounds_check(cp, index, CHECK_NULL);
2257 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2258 return res;
2259 }
2260 JVM_END
2261
2262 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2263 {
2264 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2265 JvmtiVMObjectAllocEventCollector oam;
2266 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2267 bounds_check(cp, index, CHECK_NULL);
2268 constantTag tag = cp->tag_at(index);
2269 if (!tag.is_field_or_method()) {
2270 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2271 }
2272 int klass_ref = cp->uncached_klass_ref_index_at(index);
2273 Symbol* klass_name = cp->klass_name_at(klass_ref);
2274 Symbol* member_name = cp->uncached_name_ref_at(index);
2275 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2276 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2277 objArrayHandle dest(THREAD, dest_o);
2278 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2279 dest->obj_at_put(0, str());
2280 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2281 dest->obj_at_put(1, str());
2282 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2283 dest->obj_at_put(2, str());
2284 return (jobjectArray) JNIHandles::make_local(dest());
2285 }
2286 JVM_END
2287
2288 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2289 {
2290 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2291 JvmtiVMObjectAllocEventCollector oam;
2292 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2293 bounds_check(cp, index, CHECK_0);
2294 constantTag tag = cp->tag_at(index);
2295 if (!tag.is_field_or_method()) {
2296 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2297 }
2298 return (jint) cp->uncached_klass_ref_index_at(index);
2299 }
2300 JVM_END
2301
2302 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2303 {
2304 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2305 JvmtiVMObjectAllocEventCollector oam;
2306 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2307 bounds_check(cp, index, CHECK_0);
2308 constantTag tag = cp->tag_at(index);
2309 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2310 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2311 }
2312 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2313 }
2314 JVM_END
2315
2316 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2317 {
2318 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2319 JvmtiVMObjectAllocEventCollector oam;
2320 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2321 bounds_check(cp, index, CHECK_NULL);
2322 constantTag tag = cp->tag_at(index);
2323 if (!tag.is_name_and_type()) {
2324 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2325 }
2326 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2327 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2328 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2329 objArrayHandle dest(THREAD, dest_o);
2330 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2331 dest->obj_at_put(0, str());
2332 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2333 dest->obj_at_put(1, str());
2334 return (jobjectArray) JNIHandles::make_local(dest());
2335 }
2336 JVM_END
2337
2338 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2339 {
2340 JVMWrapper("JVM_ConstantPoolGetIntAt");
2341 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2342 bounds_check(cp, index, CHECK_0);
2343 constantTag tag = cp->tag_at(index);
2344 if (!tag.is_int()) {
2345 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2346 }
2347 return cp->int_at(index);
2348 }
2349 JVM_END
2350
2351 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2352 {
2353 JVMWrapper("JVM_ConstantPoolGetLongAt");
2354 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2355 bounds_check(cp, index, CHECK_(0L));
2356 constantTag tag = cp->tag_at(index);
2357 if (!tag.is_long()) {
2358 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2359 }
2360 return cp->long_at(index);
2361 }
2362 JVM_END
2363
2364 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2365 {
2366 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2367 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2368 bounds_check(cp, index, CHECK_(0.0f));
2369 constantTag tag = cp->tag_at(index);
2370 if (!tag.is_float()) {
2371 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2372 }
2373 return cp->float_at(index);
2374 }
2375 JVM_END
2376
2377 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2378 {
2379 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2380 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2381 bounds_check(cp, index, CHECK_(0.0));
2382 constantTag tag = cp->tag_at(index);
2383 if (!tag.is_double()) {
2384 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2385 }
2386 return cp->double_at(index);
2387 }
2388 JVM_END
2389
2390 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2391 {
2392 JVMWrapper("JVM_ConstantPoolGetStringAt");
2393 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2394 bounds_check(cp, index, CHECK_NULL);
2395 constantTag tag = cp->tag_at(index);
2396 if (!tag.is_string()) {
2397 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2398 }
2399 oop str = cp->string_at(index, CHECK_NULL);
2400 return (jstring) JNIHandles::make_local(str);
2401 }
2402 JVM_END
2403
2404 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2405 {
2406 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2407 JvmtiVMObjectAllocEventCollector oam;
2408 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2409 bounds_check(cp, index, CHECK_NULL);
2410 constantTag tag = cp->tag_at(index);
2411 if (!tag.is_symbol()) {
2412 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2413 }
2414 Symbol* sym = cp->symbol_at(index);
2415 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2416 return (jstring) JNIHandles::make_local(str());
2417 }
2418 JVM_END
2419
2420 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2421 {
2422 JVMWrapper("JVM_ConstantPoolGetTagAt");
2423 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2424 bounds_check(cp, index, CHECK_0);
2425 constantTag tag = cp->tag_at(index);
2426 jbyte result = tag.value();
2427 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2428 // they are changed to the corresponding tags from the JVM spec, so that java code in
2429 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2430 if (tag.is_klass_or_reference()) {
2431 result = JVM_CONSTANT_Class;
2432 } else if (tag.is_string_index()) {
2433 result = JVM_CONSTANT_String;
2434 } else if (tag.is_method_type_in_error()) {
2435 result = JVM_CONSTANT_MethodType;
2436 } else if (tag.is_method_handle_in_error()) {
2437 result = JVM_CONSTANT_MethodHandle;
2438 } else if (tag.is_dynamic_constant_in_error()) {
2439 result = JVM_CONSTANT_Dynamic;
2440 }
2441 return result;
2442 }
2443 JVM_END
2444
2445 // Assertion support. //////////////////////////////////////////////////////////
2446
2447 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2448 JVMWrapper("JVM_DesiredAssertionStatus");
2449 assert(cls != NULL, "bad class");
2450
2451 oop r = JNIHandles::resolve(cls);
2452 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2453 if (java_lang_Class::is_primitive(r)) return false;
2454
2455 Klass* k = java_lang_Class::as_Klass(r);
2456 assert(k->is_instance_klass(), "must be an instance klass");
2457 if (!k->is_instance_klass()) return false;
2458
2459 ResourceMark rm(THREAD);
2460 const char* name = k->name()->as_C_string();
2461 bool system_class = k->class_loader() == NULL;
2462 return JavaAssertions::enabled(name, system_class);
2463
2464 JVM_END
2465
2466
2467 // Return a new AssertionStatusDirectives object with the fields filled in with
2468 // command-line assertion arguments (i.e., -ea, -da).
2469 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2470 JVMWrapper("JVM_AssertionStatusDirectives");
2471 JvmtiVMObjectAllocEventCollector oam;
2472 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2473 return JNIHandles::make_local(env, asd);
2474 JVM_END
2475
2476 // Verification ////////////////////////////////////////////////////////////////////////////////
2477
2478 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2479
2480 // RedefineClasses support: bug 6214132 caused verification to fail.
2481 // All functions from this section should call the jvmtiThreadSate function:
2482 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2483 // The function returns a Klass* of the _scratch_class if the verifier
2484 // was invoked in the middle of the class redefinition.
2485 // Otherwise it returns its argument value which is the _the_class Klass*.
2486 // Please, refer to the description in the jvmtiThreadSate.hpp.
2487
2488 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2489 JVMWrapper("JVM_GetClassNameUTF");
2490 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2491 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2492 return k->name()->as_utf8();
2493 JVM_END
2494
2495
2496 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2497 JVMWrapper("JVM_GetClassCPTypes");
2498 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2499 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2500 // types will have length zero if this is not an InstanceKlass
2501 // (length is determined by call to JVM_GetClassCPEntriesCount)
2502 if (k->is_instance_klass()) {
2503 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2504 for (int index = cp->length() - 1; index >= 0; index--) {
2505 constantTag tag = cp->tag_at(index);
2506 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2507 }
2508 }
2509 JVM_END
2510
2511
2512 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2513 JVMWrapper("JVM_GetClassCPEntriesCount");
2514 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2515 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2516 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2517 JVM_END
2518
2519
2520 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2521 JVMWrapper("JVM_GetClassFieldsCount");
2522 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2523 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2524 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2525 JVM_END
2526
2527
2528 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2529 JVMWrapper("JVM_GetClassMethodsCount");
2530 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2531 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2532 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2533 JVM_END
2534
2535
2536 // The following methods, used for the verifier, are never called with
2537 // array klasses, so a direct cast to InstanceKlass is safe.
2538 // Typically, these methods are called in a loop with bounds determined
2539 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2540 // zero for arrays.
2541 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2542 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2544 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2545 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2546 int length = method->checked_exceptions_length();
2547 if (length > 0) {
2548 CheckedExceptionElement* table= method->checked_exceptions_start();
2549 for (int i = 0; i < length; i++) {
2550 exceptions[i] = table[i].class_cp_index;
2551 }
2552 }
2553 JVM_END
2554
2555
2556 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2557 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2558 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2559 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2560 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2561 return method->checked_exceptions_length();
2562 JVM_END
2563
2564
2565 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2566 JVMWrapper("JVM_GetMethodIxByteCode");
2567 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2568 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2569 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2570 memcpy(code, method->code_base(), method->code_size());
2571 JVM_END
2572
2573
2574 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2575 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2576 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2577 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2578 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2579 return method->code_size();
2580 JVM_END
2581
2582
2583 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2584 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2585 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2586 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2587 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2588 ExceptionTable extable(method);
2589 entry->start_pc = extable.start_pc(entry_index);
2590 entry->end_pc = extable.end_pc(entry_index);
2591 entry->handler_pc = extable.handler_pc(entry_index);
2592 entry->catchType = extable.catch_type_index(entry_index);
2593 JVM_END
2594
2595
2596 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2597 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2598 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2599 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2600 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2601 return method->exception_table_length();
2602 JVM_END
2603
2604
2605 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2606 JVMWrapper("JVM_GetMethodIxModifiers");
2607 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2608 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2609 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2610 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2611 JVM_END
2612
2613
2614 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2615 JVMWrapper("JVM_GetFieldIxModifiers");
2616 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2617 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2618 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2619 JVM_END
2620
2621
2622 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2623 JVMWrapper("JVM_GetMethodIxLocalsCount");
2624 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2625 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2626 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2627 return method->max_locals();
2628 JVM_END
2629
2630
2631 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2632 JVMWrapper("JVM_GetMethodIxArgsSize");
2633 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2634 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2635 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2636 return method->size_of_parameters();
2637 JVM_END
2638
2639
2640 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2641 JVMWrapper("JVM_GetMethodIxMaxStack");
2642 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2643 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2644 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2645 return method->verifier_max_stack();
2646 JVM_END
2647
2648
2649 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2650 JVMWrapper("JVM_IsConstructorIx");
2651 ResourceMark rm(THREAD);
2652 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2653 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2654 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2655 return method->name() == vmSymbols::object_initializer_name();
2656 JVM_END
2657
2658
2659 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2660 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2661 ResourceMark rm(THREAD);
2662 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2663 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2664 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2665 return method->is_overpass();
2666 JVM_END
2667
2668 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2669 JVMWrapper("JVM_GetMethodIxIxUTF");
2670 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2671 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2672 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2673 return method->name()->as_utf8();
2674 JVM_END
2675
2676
2677 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2678 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2679 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2680 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2681 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2682 return method->signature()->as_utf8();
2683 JVM_END
2684
2685 /**
2686 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2687 * read entries in the constant pool. Since the old verifier always
2688 * works on a copy of the code, it will not see any rewriting that
2689 * may possibly occur in the middle of verification. So it is important
2690 * that nothing it calls tries to use the cpCache instead of the raw
2691 * constant pool, so we must use cp->uncached_x methods when appropriate.
2692 */
2693 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2694 JVMWrapper("JVM_GetCPFieldNameUTF");
2695 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2696 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2697 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2698 switch (cp->tag_at(cp_index).value()) {
2699 case JVM_CONSTANT_Fieldref:
2700 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2701 default:
2702 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2703 }
2704 ShouldNotReachHere();
2705 return NULL;
2706 JVM_END
2707
2708
2709 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2710 JVMWrapper("JVM_GetCPMethodNameUTF");
2711 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2712 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2713 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2714 switch (cp->tag_at(cp_index).value()) {
2715 case JVM_CONSTANT_InterfaceMethodref:
2716 case JVM_CONSTANT_Methodref:
2717 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2718 default:
2719 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2720 }
2721 ShouldNotReachHere();
2722 return NULL;
2723 JVM_END
2724
2725
2726 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2727 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2728 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2729 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2730 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2731 switch (cp->tag_at(cp_index).value()) {
2732 case JVM_CONSTANT_InterfaceMethodref:
2733 case JVM_CONSTANT_Methodref:
2734 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2735 default:
2736 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2737 }
2738 ShouldNotReachHere();
2739 return NULL;
2740 JVM_END
2741
2742
2743 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2744 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2745 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2746 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2747 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2748 switch (cp->tag_at(cp_index).value()) {
2749 case JVM_CONSTANT_Fieldref:
2750 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2751 default:
2752 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2753 }
2754 ShouldNotReachHere();
2755 return NULL;
2756 JVM_END
2757
2758
2759 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2760 JVMWrapper("JVM_GetCPClassNameUTF");
2761 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2762 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2763 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2764 Symbol* classname = cp->klass_name_at(cp_index);
2765 return classname->as_utf8();
2766 JVM_END
2767
2768
2769 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2770 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2771 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2772 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2773 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2774 switch (cp->tag_at(cp_index).value()) {
2775 case JVM_CONSTANT_Fieldref: {
2776 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2777 Symbol* classname = cp->klass_name_at(class_index);
2778 return classname->as_utf8();
2779 }
2780 default:
2781 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2782 }
2783 ShouldNotReachHere();
2784 return NULL;
2785 JVM_END
2786
2787
2788 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2789 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2790 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2791 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2792 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2793 switch (cp->tag_at(cp_index).value()) {
2794 case JVM_CONSTANT_Methodref:
2795 case JVM_CONSTANT_InterfaceMethodref: {
2796 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2797 Symbol* classname = cp->klass_name_at(class_index);
2798 return classname->as_utf8();
2799 }
2800 default:
2801 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2802 }
2803 ShouldNotReachHere();
2804 return NULL;
2805 JVM_END
2806
2807
2808 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2809 JVMWrapper("JVM_GetCPFieldModifiers");
2810 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2811 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2812 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2813 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2814 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2815 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2816 switch (cp->tag_at(cp_index).value()) {
2817 case JVM_CONSTANT_Fieldref: {
2818 Symbol* name = cp->uncached_name_ref_at(cp_index);
2819 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2820 InstanceKlass* ik = InstanceKlass::cast(k_called);
2821 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2822 if (fs.name() == name && fs.signature() == signature) {
2823 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2824 }
2825 }
2826 return -1;
2827 }
2828 default:
2829 fatal("JVM_GetCPFieldModifiers: illegal constant");
2830 }
2831 ShouldNotReachHere();
2832 return 0;
2833 JVM_END
2834
2835
2836 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2837 JVMWrapper("JVM_GetCPMethodModifiers");
2838 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2839 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2840 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2841 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2842 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2843 switch (cp->tag_at(cp_index).value()) {
2844 case JVM_CONSTANT_Methodref:
2845 case JVM_CONSTANT_InterfaceMethodref: {
2846 Symbol* name = cp->uncached_name_ref_at(cp_index);
2847 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2848 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2849 int methods_count = methods->length();
2850 for (int i = 0; i < methods_count; i++) {
2851 Method* method = methods->at(i);
2852 if (method->name() == name && method->signature() == signature) {
2853 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2854 }
2855 }
2856 return -1;
2857 }
2858 default:
2859 fatal("JVM_GetCPMethodModifiers: illegal constant");
2860 }
2861 ShouldNotReachHere();
2862 return 0;
2863 JVM_END
2864
2865
2866 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2867
2868 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2869 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2870 JVM_END
2871
2872
2873 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2874 JVMWrapper("JVM_IsSameClassPackage");
2875 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2876 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2877 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2878 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2879 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2880 JVM_END
2881
2882 // Printing support //////////////////////////////////////////////////
2883 extern "C" {
2884
2885 ATTRIBUTE_PRINTF(3, 0)
2886 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2887 // Reject count values that are negative signed values converted to
2888 // unsigned; see bug 4399518, 4417214
2889 if ((intptr_t)count <= 0) return -1;
2890
2891 int result = os::vsnprintf(str, count, fmt, args);
2892 if (result > 0 && (size_t)result >= count) {
2893 result = -1;
2894 }
2895
2896 return result;
2897 }
2898
2899 ATTRIBUTE_PRINTF(3, 4)
2900 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2901 va_list args;
2902 int len;
2903 va_start(args, fmt);
2904 len = jio_vsnprintf(str, count, fmt, args);
2905 va_end(args);
2906 return len;
2907 }
2908
2909 ATTRIBUTE_PRINTF(2, 3)
2910 int jio_fprintf(FILE* f, const char *fmt, ...) {
2911 int len;
2912 va_list args;
2913 va_start(args, fmt);
2914 len = jio_vfprintf(f, fmt, args);
2915 va_end(args);
2916 return len;
2917 }
2918
2919 ATTRIBUTE_PRINTF(2, 0)
2920 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2921 if (Arguments::vfprintf_hook() != NULL) {
2922 return Arguments::vfprintf_hook()(f, fmt, args);
2923 } else {
2924 return vfprintf(f, fmt, args);
2925 }
2926 }
2927
2928 ATTRIBUTE_PRINTF(1, 2)
2929 JNIEXPORT int jio_printf(const char *fmt, ...) {
2930 int len;
2931 va_list args;
2932 va_start(args, fmt);
2933 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2934 va_end(args);
2935 return len;
2936 }
2937
2938 // HotSpot specific jio method
2939 void jio_print(const char* s, size_t len) {
2940 // Try to make this function as atomic as possible.
2941 if (Arguments::vfprintf_hook() != NULL) {
2942 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2943 } else {
2944 // Make an unused local variable to avoid warning from gcc compiler.
2945 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2946 }
2947 }
2948
2949 } // Extern C
2950
2951 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2952
2953 // In most of the JVM thread support functions we need to access the
2954 // thread through a ThreadsListHandle to prevent it from exiting and
2955 // being reclaimed while we try to operate on it. The exceptions to this
2956 // rule are when operating on the current thread, or if the monitor of
2957 // the target java.lang.Thread is locked at the Java level - in both
2958 // cases the target cannot exit.
2959
2960 static void thread_entry(JavaThread* thread, TRAPS) {
2961 HandleMark hm(THREAD);
2962 Handle obj(THREAD, thread->threadObj());
2963 JavaValue result(T_VOID);
2964 JavaCalls::call_virtual(&result,
2965 obj,
2966 SystemDictionary::Thread_klass(),
2967 vmSymbols::run_method_name(),
2968 vmSymbols::void_method_signature(),
2969 THREAD);
2970 }
2971
2972
2973 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2974 JVMWrapper("JVM_StartThread");
2975 JavaThread *native_thread = NULL;
2976
2977 // We cannot hold the Threads_lock when we throw an exception,
2978 // due to rank ordering issues. Example: we might need to grab the
2979 // Heap_lock while we construct the exception.
2980 bool throw_illegal_thread_state = false;
2981
2982 // We must release the Threads_lock before we can post a jvmti event
2983 // in Thread::start.
2984 {
2985 // Ensure that the C++ Thread and OSThread structures aren't freed before
2986 // we operate.
2987 MutexLocker mu(Threads_lock);
2988
2989 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2990 // re-starting an already started thread, so we should usually find
2991 // that the JavaThread is null. However for a JNI attached thread
2992 // there is a small window between the Thread object being created
2993 // (with its JavaThread set) and the update to its threadStatus, so we
2994 // have to check for this
2995 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2996 throw_illegal_thread_state = true;
2997 } else {
2998 // We could also check the stillborn flag to see if this thread was already stopped, but
2999 // for historical reasons we let the thread detect that itself when it starts running
3000
3001 jlong size =
3002 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3003 // Allocate the C++ Thread structure and create the native thread. The
3004 // stack size retrieved from java is 64-bit signed, but the constructor takes
3005 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3006 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3007 // - Avoid passing negative values which would result in really large stacks.
3008 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3009 size_t sz = size > 0 ? (size_t) size : 0;
3010 native_thread = new JavaThread(&thread_entry, sz);
3011
3012 // At this point it may be possible that no osthread was created for the
3013 // JavaThread due to lack of memory. Check for this situation and throw
3014 // an exception if necessary. Eventually we may want to change this so
3015 // that we only grab the lock if the thread was created successfully -
3016 // then we can also do this check and throw the exception in the
3017 // JavaThread constructor.
3018 if (native_thread->osthread() != NULL) {
3019 // Note: the current thread is not being used within "prepare".
3020 native_thread->prepare(jthread);
3021 }
3022 }
3023 }
3024
3025 if (throw_illegal_thread_state) {
3026 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3027 }
3028
3029 assert(native_thread != NULL, "Starting null thread?");
3030
3031 if (native_thread->osthread() == NULL) {
3032 // No one should hold a reference to the 'native_thread'.
3033 native_thread->smr_delete();
3034 if (JvmtiExport::should_post_resource_exhausted()) {
3035 JvmtiExport::post_resource_exhausted(
3036 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3037 os::native_thread_creation_failed_msg());
3038 }
3039 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3040 os::native_thread_creation_failed_msg());
3041 }
3042
3043 #if INCLUDE_JFR
3044 if (JfrRecorder::is_recording() && EventThreadStart::is_enabled() &&
3045 EventThreadStart::is_stacktrace_enabled()) {
3046 JfrThreadLocal* tl = native_thread->jfr_thread_local();
3047 // skip Thread.start() and Thread.start0()
3048 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2));
3049 }
3050 #endif
3051
3052 Thread::start(native_thread);
3053
3054 JVM_END
3055
3056
3057 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3058 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
3059 // but is thought to be reliable and simple. In the case, where the receiver is the
3060 // same thread as the sender, no VM_Operation is needed.
3061 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3062 JVMWrapper("JVM_StopThread");
3063
3064 // A nested ThreadsListHandle will grab the Threads_lock so create
3065 // tlh before we resolve throwable.
3066 ThreadsListHandle tlh(thread);
3067 oop java_throwable = JNIHandles::resolve(throwable);
3068 if (java_throwable == NULL) {
3069 THROW(vmSymbols::java_lang_NullPointerException());
3070 }
3071 oop java_thread = NULL;
3072 JavaThread* receiver = NULL;
3073 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3074 Events::log_exception(thread,
3075 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3076 p2i(receiver), p2i(java_thread), p2i(throwable));
3077
3078 if (is_alive) {
3079 // jthread refers to a live JavaThread.
3080 if (thread == receiver) {
3081 // Exception is getting thrown at self so no VM_Operation needed.
3082 THROW_OOP(java_throwable);
3083 } else {
3084 // Use a VM_Operation to throw the exception.
3085 Thread::send_async_exception(java_thread, java_throwable);
3086 }
3087 } else {
3088 // Either:
3089 // - target thread has not been started before being stopped, or
3090 // - target thread already terminated
3091 // We could read the threadStatus to determine which case it is
3092 // but that is overkill as it doesn't matter. We must set the
3093 // stillborn flag for the first case, and if the thread has already
3094 // exited setting this flag has no effect.
3095 java_lang_Thread::set_stillborn(java_thread);
3096 }
3097 JVM_END
3098
3099
3100 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3101 JVMWrapper("JVM_IsThreadAlive");
3102
3103 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3104 return java_lang_Thread::is_alive(thread_oop);
3105 JVM_END
3106
3107
3108 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3109 JVMWrapper("JVM_SuspendThread");
3110
3111 ThreadsListHandle tlh(thread);
3112 JavaThread* receiver = NULL;
3113 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3114 if (is_alive) {
3115 // jthread refers to a live JavaThread.
3116 {
3117 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3118 if (receiver->is_external_suspend()) {
3119 // Don't allow nested external suspend requests. We can't return
3120 // an error from this interface so just ignore the problem.
3121 return;
3122 }
3123 if (receiver->is_exiting()) { // thread is in the process of exiting
3124 return;
3125 }
3126 receiver->set_external_suspend();
3127 }
3128
3129 // java_suspend() will catch threads in the process of exiting
3130 // and will ignore them.
3131 receiver->java_suspend();
3132
3133 // It would be nice to have the following assertion in all the
3134 // time, but it is possible for a racing resume request to have
3135 // resumed this thread right after we suspended it. Temporarily
3136 // enable this assertion if you are chasing a different kind of
3137 // bug.
3138 //
3139 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3140 // receiver->is_being_ext_suspended(), "thread is not suspended");
3141 }
3142 JVM_END
3143
3144
3145 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3146 JVMWrapper("JVM_ResumeThread");
3147
3148 ThreadsListHandle tlh(thread);
3149 JavaThread* receiver = NULL;
3150 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3151 if (is_alive) {
3152 // jthread refers to a live JavaThread.
3153
3154 // This is the original comment for this Threads_lock grab:
3155 // We need to *always* get the threads lock here, since this operation cannot be allowed during
3156 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3157 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3158 // looks at it.
3159 //
3160 // The above comment dates back to when we had both internal and
3161 // external suspend APIs that shared a common underlying mechanism.
3162 // External suspend is now entirely cooperative and doesn't share
3163 // anything with internal suspend. That said, there are some
3164 // assumptions in the VM that an external resume grabs the
3165 // Threads_lock. We can't drop the Threads_lock grab here until we
3166 // resolve the assumptions that exist elsewhere.
3167 //
3168 MutexLocker ml(Threads_lock);
3169 receiver->java_resume();
3170 }
3171 JVM_END
3172
3173
3174 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3175 JVMWrapper("JVM_SetThreadPriority");
3176
3177 ThreadsListHandle tlh(thread);
3178 oop java_thread = NULL;
3179 JavaThread* receiver = NULL;
3180 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3181 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3182
3183 if (is_alive) {
3184 // jthread refers to a live JavaThread.
3185 Thread::set_priority(receiver, (ThreadPriority)prio);
3186 }
3187 // Implied else: If the JavaThread hasn't started yet, then the
3188 // priority set in the java.lang.Thread object above will be pushed
3189 // down when it does start.
3190 JVM_END
3191
3192
3193 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3194 JVMWrapper("JVM_Yield");
3195 if (os::dont_yield()) return;
3196 HOTSPOT_THREAD_YIELD();
3197 os::naked_yield();
3198 JVM_END
3199
3200 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3201 assert(event != NULL, "invariant");
3202 assert(event->should_commit(), "invariant");
3203 event->set_time(millis);
3204 event->commit();
3205 }
3206
3207 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3208 JVMWrapper("JVM_Sleep");
3209
3210 if (millis < 0) {
3211 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3212 }
3213
3214 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3215 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3216 }
3217
3218 // Save current thread state and restore it at the end of this block.
3219 // And set new thread state to SLEEPING.
3220 JavaThreadSleepState jtss(thread);
3221
3222 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3223 EventThreadSleep event;
3224
3225 if (millis == 0) {
3226 os::naked_yield();
3227 } else {
3228 ThreadState old_state = thread->osthread()->get_state();
3229 thread->osthread()->set_state(SLEEPING);
3230 if (!thread->sleep(millis)) { // interrupted
3231 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3232 // us while we were sleeping. We do not overwrite those.
3233 if (!HAS_PENDING_EXCEPTION) {
3234 if (event.should_commit()) {
3235 post_thread_sleep_event(&event, millis);
3236 }
3237 HOTSPOT_THREAD_SLEEP_END(1);
3238
3239 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3240 // to properly restore the thread state. That's likely wrong.
3241 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3242 }
3243 }
3244 thread->osthread()->set_state(old_state);
3245 }
3246 if (event.should_commit()) {
3247 post_thread_sleep_event(&event, millis);
3248 }
3249 HOTSPOT_THREAD_SLEEP_END(0);
3250 JVM_END
3251
3252 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3253 JVMWrapper("JVM_CurrentThread");
3254 oop jthread = thread->threadObj();
3255 assert (thread != NULL, "no current thread!");
3256 return JNIHandles::make_local(env, jthread);
3257 JVM_END
3258
3259 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3260 JVMWrapper("JVM_Interrupt");
3261
3262 ThreadsListHandle tlh(thread);
3263 JavaThread* receiver = NULL;
3264 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3265 if (is_alive) {
3266 // jthread refers to a live JavaThread.
3267 receiver->interrupt();
3268 }
3269 JVM_END
3270
3271
3272 // Return true iff the current thread has locked the object passed in
3273
3274 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3275 JVMWrapper("JVM_HoldsLock");
3276 assert(THREAD->is_Java_thread(), "sanity check");
3277 if (obj == NULL) {
3278 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3279 }
3280 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3281 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3282 JVM_END
3283
3284
3285 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3286 JVMWrapper("JVM_DumpAllStacks");
3287 VM_PrintThreads op;
3288 VMThread::execute(&op);
3289 if (JvmtiExport::should_post_data_dump()) {
3290 JvmtiExport::post_data_dump();
3291 }
3292 JVM_END
3293
3294 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3295 JVMWrapper("JVM_SetNativeThreadName");
3296
3297 // We don't use a ThreadsListHandle here because the current thread
3298 // must be alive.
3299 oop java_thread = JNIHandles::resolve_non_null(jthread);
3300 JavaThread* thr = java_lang_Thread::thread(java_thread);
3301 if (thread == thr && !thr->has_attached_via_jni()) {
3302 // Thread naming is only supported for the current thread and
3303 // we don't set the name of an attached thread to avoid stepping
3304 // on other programs.
3305 ResourceMark rm(thread);
3306 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3307 os::set_native_thread_name(thread_name);
3308 }
3309 JVM_END
3310
3311 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3312
3313 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3314 JVMWrapper("JVM_GetClassContext");
3315 ResourceMark rm(THREAD);
3316 JvmtiVMObjectAllocEventCollector oam;
3317 vframeStream vfst(thread);
3318
3319 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3320 // This must only be called from SecurityManager.getClassContext
3321 Method* m = vfst.method();
3322 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3323 m->name() == vmSymbols::getClassContext_name() &&
3324 m->signature() == vmSymbols::void_class_array_signature())) {
3325 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3326 }
3327 }
3328
3329 // Collect method holders
3330 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3331 for (; !vfst.at_end(); vfst.security_next()) {
3332 Method* m = vfst.method();
3333 // Native frames are not returned
3334 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3335 Klass* holder = m->method_holder();
3336 assert(holder->is_klass(), "just checking");
3337 klass_array->append(holder);
3338 }
3339 }
3340
3341 // Create result array of type [Ljava/lang/Class;
3342 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3343 // Fill in mirrors corresponding to method holders
3344 for (int i = 0; i < klass_array->length(); i++) {
3345 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3346 }
3347
3348 return (jobjectArray) JNIHandles::make_local(env, result);
3349 JVM_END
3350
3351
3352 // java.lang.Package ////////////////////////////////////////////////////////////////
3353
3354
3355 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3356 JVMWrapper("JVM_GetSystemPackage");
3357 ResourceMark rm(THREAD);
3358 JvmtiVMObjectAllocEventCollector oam;
3359 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3360 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3361 return (jstring) JNIHandles::make_local(result);
3362 JVM_END
3363
3364
3365 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3366 JVMWrapper("JVM_GetSystemPackages");
3367 JvmtiVMObjectAllocEventCollector oam;
3368 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3369 return (jobjectArray) JNIHandles::make_local(result);
3370 JVM_END
3371
3372
3373 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3374
3375
3376 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3377 JVMWrapper("JVM_GetAndClearReferencePendingList");
3378
3379 MonitorLocker ml(Heap_lock);
3380 oop ref = Universe::reference_pending_list();
3381 if (ref != NULL) {
3382 Universe::set_reference_pending_list(NULL);
3383 }
3384 return JNIHandles::make_local(env, ref);
3385 JVM_END
3386
3387 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3388 JVMWrapper("JVM_HasReferencePendingList");
3389 MonitorLocker ml(Heap_lock);
3390 return Universe::has_reference_pending_list();
3391 JVM_END
3392
3393 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3394 JVMWrapper("JVM_WaitForReferencePendingList");
3395 MonitorLocker ml(Heap_lock);
3396 while (!Universe::has_reference_pending_list()) {
3397 ml.wait();
3398 }
3399 JVM_END
3400
3401
3402 // ObjectInputStream ///////////////////////////////////////////////////////////////
3403
3404 // Return the first user-defined class loader up the execution stack, or null
3405 // if only code from the bootstrap or platform class loader is on the stack.
3406
3407 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3408 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3409 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3410 oop loader = vfst.method()->method_holder()->class_loader();
3411 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3412 return JNIHandles::make_local(env, loader);
3413 }
3414 }
3415 return NULL;
3416 JVM_END
3417
3418
3419 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3420
3421
3422 // resolve array handle and check arguments
3423 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3424 if (arr == NULL) {
3425 THROW_0(vmSymbols::java_lang_NullPointerException());
3426 }
3427 oop a = JNIHandles::resolve_non_null(arr);
3428 if (!a->is_array()) {
3429 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3430 } else if (type_array_only && !a->is_typeArray()) {
3431 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3432 }
3433 return arrayOop(a);
3434 }
3435
3436
3437 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3438 JVMWrapper("JVM_GetArrayLength");
3439 arrayOop a = check_array(env, arr, false, CHECK_0);
3440 return a->length();
3441 JVM_END
3442
3443
3444 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3445 JVMWrapper("JVM_Array_Get");
3446 JvmtiVMObjectAllocEventCollector oam;
3447 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3448 jvalue value;
3449 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3450 oop box = Reflection::box(&value, type, CHECK_NULL);
3451 return JNIHandles::make_local(env, box);
3452 JVM_END
3453
3454
3455 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3456 JVMWrapper("JVM_GetPrimitiveArrayElement");
3457 jvalue value;
3458 value.i = 0; // to initialize value before getting used in CHECK
3459 arrayOop a = check_array(env, arr, true, CHECK_(value));
3460 assert(a->is_typeArray(), "just checking");
3461 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3462 BasicType wide_type = (BasicType) wCode;
3463 if (type != wide_type) {
3464 Reflection::widen(&value, type, wide_type, CHECK_(value));
3465 }
3466 return value;
3467 JVM_END
3468
3469
3470 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3471 JVMWrapper("JVM_SetArrayElement");
3472 arrayOop a = check_array(env, arr, false, CHECK);
3473 oop box = JNIHandles::resolve(val);
3474 jvalue value;
3475 value.i = 0; // to initialize value before getting used in CHECK
3476 BasicType value_type;
3477 if (a->is_objArray()) {
3478 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3479 value_type = Reflection::unbox_for_regular_object(box, &value);
3480 } else {
3481 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3482 }
3483 Reflection::array_set(&value, a, index, value_type, CHECK);
3484 JVM_END
3485
3486
3487 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3488 JVMWrapper("JVM_SetPrimitiveArrayElement");
3489 arrayOop a = check_array(env, arr, true, CHECK);
3490 assert(a->is_typeArray(), "just checking");
3491 BasicType value_type = (BasicType) vCode;
3492 Reflection::array_set(&v, a, index, value_type, CHECK);
3493 JVM_END
3494
3495
3496 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3497 JVMWrapper("JVM_NewArray");
3498 JvmtiVMObjectAllocEventCollector oam;
3499 oop element_mirror = JNIHandles::resolve(eltClass);
3500 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3501 return JNIHandles::make_local(env, result);
3502 JVM_END
3503
3504
3505 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3506 JVMWrapper("JVM_NewMultiArray");
3507 JvmtiVMObjectAllocEventCollector oam;
3508 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3509 oop element_mirror = JNIHandles::resolve(eltClass);
3510 assert(dim_array->is_typeArray(), "just checking");
3511 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3512 return JNIHandles::make_local(env, result);
3513 JVM_END
3514
3515
3516 // Library support ///////////////////////////////////////////////////////////////////////////
3517
3518 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3519 //%note jvm_ct
3520 JVMWrapper("JVM_LoadLibrary");
3521 char ebuf[1024];
3522 void *load_result;
3523 {
3524 ThreadToNativeFromVM ttnfvm(thread);
3525 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3526 }
3527 if (load_result == NULL) {
3528 char msg[1024];
3529 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3530 // Since 'ebuf' may contain a string encoded using
3531 // platform encoding scheme, we need to pass
3532 // Exceptions::unsafe_to_utf8 to the new_exception method
3533 // as the last argument. See bug 6367357.
3534 Handle h_exception =
3535 Exceptions::new_exception(thread,
3536 vmSymbols::java_lang_UnsatisfiedLinkError(),
3537 msg, Exceptions::unsafe_to_utf8);
3538
3539 THROW_HANDLE_0(h_exception);
3540 }
3541 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3542 return load_result;
3543 JVM_END
3544
3545
3546 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3547 JVMWrapper("JVM_UnloadLibrary");
3548 os::dll_unload(handle);
3549 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3550 JVM_END
3551
3552
3553 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3554 JVMWrapper("JVM_FindLibraryEntry");
3555 void* find_result = os::dll_lookup(handle, name);
3556 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3557 find_result != NULL ? "Found" : "Failed to find",
3558 name, p2i(handle));
3559 return find_result;
3560 JVM_END
3561
3562
3563 // JNI version ///////////////////////////////////////////////////////////////////////////////
3564
3565 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3566 JVMWrapper("JVM_IsSupportedJNIVersion");
3567 return Threads::is_supported_jni_version_including_1_1(version);
3568 JVM_END
3569
3570
3571 // String support ///////////////////////////////////////////////////////////////////////////
3572
3573 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3574 JVMWrapper("JVM_InternString");
3575 JvmtiVMObjectAllocEventCollector oam;
3576 if (str == NULL) return NULL;
3577 oop string = JNIHandles::resolve_non_null(str);
3578 oop result = StringTable::intern(string, CHECK_NULL);
3579 return (jstring) JNIHandles::make_local(env, result);
3580 JVM_END
3581
3582
3583 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3584
3585 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3586 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3587 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3588 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3589 // nature. JavaThreads will be "in native" when using this API from JDK code.
3590
3591
3592 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3593 VM_Exit::block_if_vm_exited();
3594 JVMWrapper("JVM_RawMonitorCreate");
3595 return new os::PlatformMutex();
3596 }
3597
3598
3599 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3600 VM_Exit::block_if_vm_exited();
3601 JVMWrapper("JVM_RawMonitorDestroy");
3602 delete ((os::PlatformMutex*) mon);
3603 }
3604
3605
3606 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3607 VM_Exit::block_if_vm_exited();
3608 JVMWrapper("JVM_RawMonitorEnter");
3609 ((os::PlatformMutex*) mon)->lock();
3610 return 0;
3611 }
3612
3613
3614 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3615 VM_Exit::block_if_vm_exited();
3616 JVMWrapper("JVM_RawMonitorExit");
3617 ((os::PlatformMutex*) mon)->unlock();
3618 }
3619
3620
3621 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3622
3623 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3624 Handle loader, Handle protection_domain,
3625 jboolean throwError, TRAPS) {
3626 // Security Note:
3627 // The Java level wrapper will perform the necessary security check allowing
3628 // us to pass the NULL as the initiating class loader. The VM is responsible for
3629 // the checkPackageAccess relative to the initiating class loader via the
3630 // protection_domain. The protection_domain is passed as NULL by the java code
3631 // if there is no security manager in 3-arg Class.forName().
3632 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3633
3634 // Check if we should initialize the class
3635 if (init && klass->is_instance_klass()) {
3636 klass->initialize(CHECK_NULL);
3637 }
3638 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3639 }
3640
3641
3642 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3643
3644 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3645 JVMWrapper("JVM_InvokeMethod");
3646 Handle method_handle;
3647 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3648 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3649 Handle receiver(THREAD, JNIHandles::resolve(obj));
3650 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3651 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3652 jobject res = JNIHandles::make_local(env, result);
3653 if (JvmtiExport::should_post_vm_object_alloc()) {
3654 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3655 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3656 if (java_lang_Class::is_primitive(ret_type)) {
3657 // Only for primitive type vm allocates memory for java object.
3658 // See box() method.
3659 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3660 }
3661 }
3662 return res;
3663 } else {
3664 THROW_0(vmSymbols::java_lang_StackOverflowError());
3665 }
3666 JVM_END
3667
3668
3669 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3670 JVMWrapper("JVM_NewInstanceFromConstructor");
3671 oop constructor_mirror = JNIHandles::resolve(c);
3672 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3673 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3674 jobject res = JNIHandles::make_local(env, result);
3675 if (JvmtiExport::should_post_vm_object_alloc()) {
3676 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3677 }
3678 return res;
3679 JVM_END
3680
3681 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3682
3683 JVM_LEAF(jboolean, JVM_SupportsCX8())
3684 JVMWrapper("JVM_SupportsCX8");
3685 return VM_Version::supports_cx8();
3686 JVM_END
3687
3688 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3689 JVMWrapper("JVM_InitializeFromArchive");
3690 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3691 assert(k->is_klass(), "just checking");
3692 HeapShared::initialize_from_archived_subgraph(k);
3693 JVM_END
3694
3695 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForCDSDump())
3696 JVMWrapper("JVM_GetRandomSeedForCDSDump");
3697 if (DumpSharedSpaces) {
3698 const char* release = Abstract_VM_Version::vm_release();
3699 const char* dbg_level = Abstract_VM_Version::jdk_debug_level();
3700 const char* version = VM_Version::internal_vm_info_string();
3701 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3702 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3703 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3704 seed += (jlong)Abstract_VM_Version::vm_major_version();
3705 seed += (jlong)Abstract_VM_Version::vm_minor_version();
3706 seed += (jlong)Abstract_VM_Version::vm_security_version();
3707 seed += (jlong)Abstract_VM_Version::vm_patch_version();
3708 if (seed == 0) { // don't let this ever be zero.
3709 seed = 0x87654321;
3710 }
3711 log_debug(cds)("JVM_GetRandomSeedForCDSDump() = " JLONG_FORMAT, seed);
3712 return seed;
3713 } else {
3714 return 0;
3715 }
3716 JVM_END
3717
3718 // Returns an array of all live Thread objects (VM internal JavaThreads,
3719 // jvmti agent threads, and JNI attaching threads are skipped)
3720 // See CR 6404306 regarding JNI attaching threads
3721 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3722 ResourceMark rm(THREAD);
3723 ThreadsListEnumerator tle(THREAD, false, false);
3724 JvmtiVMObjectAllocEventCollector oam;
3725
3726 int num_threads = tle.num_threads();
3727 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3728 objArrayHandle threads_ah(THREAD, r);
3729
3730 for (int i = 0; i < num_threads; i++) {
3731 Handle h = tle.get_threadObj(i);
3732 threads_ah->obj_at_put(i, h());
3733 }
3734
3735 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3736 JVM_END
3737
3738
3739 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3740 // Return StackTraceElement[][], each element is the stack trace of a thread in
3741 // the corresponding entry in the given threads array
3742 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3743 JVMWrapper("JVM_DumpThreads");
3744 JvmtiVMObjectAllocEventCollector oam;
3745
3746 // Check if threads is null
3747 if (threads == NULL) {
3748 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3749 }
3750
3751 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3752 objArrayHandle ah(THREAD, a);
3753 int num_threads = ah->length();
3754 // check if threads is non-empty array
3755 if (num_threads == 0) {
3756 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3757 }
3758
3759 // check if threads is not an array of objects of Thread class
3760 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3761 if (k != SystemDictionary::Thread_klass()) {
3762 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3763 }
3764
3765 ResourceMark rm(THREAD);
3766
3767 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3768 for (int i = 0; i < num_threads; i++) {
3769 oop thread_obj = ah->obj_at(i);
3770 instanceHandle h(THREAD, (instanceOop) thread_obj);
3771 thread_handle_array->append(h);
3772 }
3773
3774 // The JavaThread references in thread_handle_array are validated
3775 // in VM_ThreadDump::doit().
3776 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3777 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3778
3779 JVM_END
3780
3781 // JVM monitoring and management support
3782 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3783 return Management::get_jmm_interface(version);
3784 JVM_END
3785
3786 // com.sun.tools.attach.VirtualMachine agent properties support
3787 //
3788 // Initialize the agent properties with the properties maintained in the VM
3789 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3790 JVMWrapper("JVM_InitAgentProperties");
3791 ResourceMark rm;
3792
3793 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3794
3795 PUTPROP(props, "sun.java.command", Arguments::java_command());
3796 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3797 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3798 return properties;
3799 JVM_END
3800
3801 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3802 {
3803 JVMWrapper("JVM_GetEnclosingMethodInfo");
3804 JvmtiVMObjectAllocEventCollector oam;
3805
3806 if (ofClass == NULL) {
3807 return NULL;
3808 }
3809 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3810 // Special handling for primitive objects
3811 if (java_lang_Class::is_primitive(mirror())) {
3812 return NULL;
3813 }
3814 Klass* k = java_lang_Class::as_Klass(mirror());
3815 if (!k->is_instance_klass()) {
3816 return NULL;
3817 }
3818 InstanceKlass* ik = InstanceKlass::cast(k);
3819 int encl_method_class_idx = ik->enclosing_method_class_index();
3820 if (encl_method_class_idx == 0) {
3821 return NULL;
3822 }
3823 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3824 objArrayHandle dest(THREAD, dest_o);
3825 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3826 dest->obj_at_put(0, enc_k->java_mirror());
3827 int encl_method_method_idx = ik->enclosing_method_method_index();
3828 if (encl_method_method_idx != 0) {
3829 Symbol* sym = ik->constants()->symbol_at(
3830 extract_low_short_from_int(
3831 ik->constants()->name_and_type_at(encl_method_method_idx)));
3832 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3833 dest->obj_at_put(1, str());
3834 sym = ik->constants()->symbol_at(
3835 extract_high_short_from_int(
3836 ik->constants()->name_and_type_at(encl_method_method_idx)));
3837 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3838 dest->obj_at_put(2, str());
3839 }
3840 return (jobjectArray) JNIHandles::make_local(dest());
3841 }
3842 JVM_END
3843
3844 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3845 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3846 ResourceMark rm(THREAD);
3847
3848 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3849 return NULL;
3850 }
3851
3852 char** vm_flags = Arguments::jvm_flags_array();
3853 char** vm_args = Arguments::jvm_args_array();
3854 int num_flags = Arguments::num_jvm_flags();
3855 int num_args = Arguments::num_jvm_args();
3856
3857 InstanceKlass* ik = SystemDictionary::String_klass();
3858 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3859 objArrayHandle result_h(THREAD, r);
3860
3861 int index = 0;
3862 for (int j = 0; j < num_flags; j++, index++) {
3863 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3864 result_h->obj_at_put(index, h());
3865 }
3866 for (int i = 0; i < num_args; i++, index++) {
3867 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3868 result_h->obj_at_put(index, h());
3869 }
3870 return (jobjectArray) JNIHandles::make_local(env, result_h());
3871 JVM_END
3872
3873 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3874 return os::get_signal_number(name);
3875 JVM_END