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