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 WEAK_CLASS = java_lang_invoke_MemberName::MN_WEAK_CLASS,
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 weakly 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_weak = (flags & WEAK_CLASS) == WEAK_CLASS;
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(THREAD);
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_weak ? "weak" : "strong",
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_weak) {
1042 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "weak class is only applicable for hidden classes");
1043 }
1044 if (vm_annotations) {
1045 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1046 }
1047 if (flags) {
1048 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1049 err_msg("flag 0x%x can only be set for hidden classes", 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_weak,
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 assert(host != NULL, "host should never be NULL");
2056 return (jclass) 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 (doLog) {
2098 ResourceMark rm(THREAD);
2099 stringStream ss;
2100 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2101 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2102 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2103 log_trace(class, nestmates)("%s", ss.as_string());
2104 }
2105 CLEAR_PENDING_EXCEPTION;
2106 continue;
2107 }
2108 if (k->is_instance_klass()) {
2109 InstanceKlass* ik = InstanceKlass::cast(k);
2110 InstanceKlass* nest_host_k = ik->nest_host(THREAD);
2111 if (nest_host_k == host) {
2112 result->obj_at_put(count+1, k->java_mirror());
2113 count++;
2114 if (doLog) {
2115 ResourceMark rm(THREAD);
2116 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2117 }
2118 } else {
2119 if (doLog) {
2120 ResourceMark rm(THREAD);
2121 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2122 ik->external_name(), nest_host_k->external_name());
2123 }
2124 }
2125 } else {
2126 if (doLog) {
2127 ResourceMark rm(THREAD);
2128 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2129 k->external_name());
2130 }
2131 }
2132 }
2133 if (count < length) {
2134 // we had invalid entries so we need to compact the array
2135 if (doLog) {
2136 ResourceMark rm(THREAD);
2137 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2138 length + 1, count + 1);
2139 }
2140 objArrayOop r2 = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2141 count + 1, CHECK_NULL);
2142 objArrayHandle result2(THREAD, r2);
2143 for (int i = 0; i < count + 1; i++) {
2144 result2->obj_at_put(i, result->obj_at(i));
2145 }
2146 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2147 }
2148 }
2149 else {
2150 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2151 }
2152 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2153 }
2154 }
2155 JVM_END
2156
2157 // Constant pool access //////////////////////////////////////////////////////////
2158
2159 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2160 {
2161 JVMWrapper("JVM_GetClassConstantPool");
2162 JvmtiVMObjectAllocEventCollector oam;
2163
2164 // Return null for primitives and arrays
2165 if (!java_lang_Class::is_primitive(JNIHandles::resolve_non_null(cls))) {
2166 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2167 if (k->is_instance_klass()) {
2168 InstanceKlass* k_h = InstanceKlass::cast(k);
2169 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2170 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2171 return JNIHandles::make_local(jcp());
2172 }
2173 }
2174 return NULL;
2175 }
2176 JVM_END
2177
2178
2179 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2180 {
2181 JVMWrapper("JVM_ConstantPoolGetSize");
2182 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2183 return cp->length();
2184 }
2185 JVM_END
2186
2187
2188 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2189 {
2190 JVMWrapper("JVM_ConstantPoolGetClassAt");
2191 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2192 bounds_check(cp, index, CHECK_NULL);
2193 constantTag tag = cp->tag_at(index);
2194 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2195 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2196 }
2197 Klass* k = cp->klass_at(index, CHECK_NULL);
2198 return (jclass) JNIHandles::make_local(k->java_mirror());
2199 }
2200 JVM_END
2201
2202 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2203 {
2204 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2205 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2206 bounds_check(cp, index, CHECK_NULL);
2207 constantTag tag = cp->tag_at(index);
2208 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2209 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2210 }
2211 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2212 if (k == NULL) return NULL;
2213 return (jclass) JNIHandles::make_local(k->java_mirror());
2214 }
2215 JVM_END
2216
2217 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2218 constantTag tag = cp->tag_at(index);
2219 if (!tag.is_method() && !tag.is_interface_method()) {
2220 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2221 }
2222 int klass_ref = cp->uncached_klass_ref_index_at(index);
2223 Klass* k_o;
2224 if (force_resolution) {
2225 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2226 } else {
2227 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2228 if (k_o == NULL) return NULL;
2229 }
2230 InstanceKlass* k = InstanceKlass::cast(k_o);
2231 Symbol* name = cp->uncached_name_ref_at(index);
2232 Symbol* sig = cp->uncached_signature_ref_at(index);
2233 methodHandle m (THREAD, k->find_method(name, sig));
2234 if (m.is_null()) {
2235 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2236 }
2237 oop method;
2238 if (!m->is_initializer() || m->is_static()) {
2239 method = Reflection::new_method(m, true, CHECK_NULL);
2240 } else {
2241 method = Reflection::new_constructor(m, CHECK_NULL);
2242 }
2243 return JNIHandles::make_local(method);
2244 }
2245
2246 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2247 {
2248 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2249 JvmtiVMObjectAllocEventCollector oam;
2250 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2251 bounds_check(cp, index, CHECK_NULL);
2252 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2253 return res;
2254 }
2255 JVM_END
2256
2257 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2258 {
2259 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2260 JvmtiVMObjectAllocEventCollector oam;
2261 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2262 bounds_check(cp, index, CHECK_NULL);
2263 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2264 return res;
2265 }
2266 JVM_END
2267
2268 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2269 constantTag tag = cp->tag_at(index);
2270 if (!tag.is_field()) {
2271 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2272 }
2273 int klass_ref = cp->uncached_klass_ref_index_at(index);
2274 Klass* k_o;
2275 if (force_resolution) {
2276 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2277 } else {
2278 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2279 if (k_o == NULL) return NULL;
2280 }
2281 InstanceKlass* k = InstanceKlass::cast(k_o);
2282 Symbol* name = cp->uncached_name_ref_at(index);
2283 Symbol* sig = cp->uncached_signature_ref_at(index);
2284 fieldDescriptor fd;
2285 Klass* target_klass = k->find_field(name, sig, &fd);
2286 if (target_klass == NULL) {
2287 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2288 }
2289 oop field = Reflection::new_field(&fd, CHECK_NULL);
2290 return JNIHandles::make_local(field);
2291 }
2292
2293 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2294 {
2295 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2296 JvmtiVMObjectAllocEventCollector oam;
2297 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2298 bounds_check(cp, index, CHECK_NULL);
2299 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2300 return res;
2301 }
2302 JVM_END
2303
2304 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2305 {
2306 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2307 JvmtiVMObjectAllocEventCollector oam;
2308 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2309 bounds_check(cp, index, CHECK_NULL);
2310 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2311 return res;
2312 }
2313 JVM_END
2314
2315 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2316 {
2317 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2318 JvmtiVMObjectAllocEventCollector oam;
2319 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2320 bounds_check(cp, index, CHECK_NULL);
2321 constantTag tag = cp->tag_at(index);
2322 if (!tag.is_field_or_method()) {
2323 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2324 }
2325 int klass_ref = cp->uncached_klass_ref_index_at(index);
2326 Symbol* klass_name = cp->klass_name_at(klass_ref);
2327 Symbol* member_name = cp->uncached_name_ref_at(index);
2328 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2329 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2330 objArrayHandle dest(THREAD, dest_o);
2331 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2332 dest->obj_at_put(0, str());
2333 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2334 dest->obj_at_put(1, str());
2335 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2336 dest->obj_at_put(2, str());
2337 return (jobjectArray) JNIHandles::make_local(dest());
2338 }
2339 JVM_END
2340
2341 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2342 {
2343 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2344 JvmtiVMObjectAllocEventCollector oam;
2345 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2346 bounds_check(cp, index, CHECK_0);
2347 constantTag tag = cp->tag_at(index);
2348 if (!tag.is_field_or_method()) {
2349 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2350 }
2351 return (jint) cp->uncached_klass_ref_index_at(index);
2352 }
2353 JVM_END
2354
2355 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2356 {
2357 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2358 JvmtiVMObjectAllocEventCollector oam;
2359 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2360 bounds_check(cp, index, CHECK_0);
2361 constantTag tag = cp->tag_at(index);
2362 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2363 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2364 }
2365 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2366 }
2367 JVM_END
2368
2369 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2370 {
2371 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2372 JvmtiVMObjectAllocEventCollector oam;
2373 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2374 bounds_check(cp, index, CHECK_NULL);
2375 constantTag tag = cp->tag_at(index);
2376 if (!tag.is_name_and_type()) {
2377 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2378 }
2379 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2380 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2381 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2382 objArrayHandle dest(THREAD, dest_o);
2383 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2384 dest->obj_at_put(0, str());
2385 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2386 dest->obj_at_put(1, str());
2387 return (jobjectArray) JNIHandles::make_local(dest());
2388 }
2389 JVM_END
2390
2391 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2392 {
2393 JVMWrapper("JVM_ConstantPoolGetIntAt");
2394 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2395 bounds_check(cp, index, CHECK_0);
2396 constantTag tag = cp->tag_at(index);
2397 if (!tag.is_int()) {
2398 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2399 }
2400 return cp->int_at(index);
2401 }
2402 JVM_END
2403
2404 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2405 {
2406 JVMWrapper("JVM_ConstantPoolGetLongAt");
2407 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2408 bounds_check(cp, index, CHECK_(0L));
2409 constantTag tag = cp->tag_at(index);
2410 if (!tag.is_long()) {
2411 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2412 }
2413 return cp->long_at(index);
2414 }
2415 JVM_END
2416
2417 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2418 {
2419 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2420 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2421 bounds_check(cp, index, CHECK_(0.0f));
2422 constantTag tag = cp->tag_at(index);
2423 if (!tag.is_float()) {
2424 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2425 }
2426 return cp->float_at(index);
2427 }
2428 JVM_END
2429
2430 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2431 {
2432 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2433 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2434 bounds_check(cp, index, CHECK_(0.0));
2435 constantTag tag = cp->tag_at(index);
2436 if (!tag.is_double()) {
2437 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2438 }
2439 return cp->double_at(index);
2440 }
2441 JVM_END
2442
2443 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2444 {
2445 JVMWrapper("JVM_ConstantPoolGetStringAt");
2446 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2447 bounds_check(cp, index, CHECK_NULL);
2448 constantTag tag = cp->tag_at(index);
2449 if (!tag.is_string()) {
2450 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2451 }
2452 oop str = cp->string_at(index, CHECK_NULL);
2453 return (jstring) JNIHandles::make_local(str);
2454 }
2455 JVM_END
2456
2457 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2458 {
2459 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2460 JvmtiVMObjectAllocEventCollector oam;
2461 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2462 bounds_check(cp, index, CHECK_NULL);
2463 constantTag tag = cp->tag_at(index);
2464 if (!tag.is_symbol()) {
2465 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2466 }
2467 Symbol* sym = cp->symbol_at(index);
2468 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2469 return (jstring) JNIHandles::make_local(str());
2470 }
2471 JVM_END
2472
2473 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2474 {
2475 JVMWrapper("JVM_ConstantPoolGetTagAt");
2476 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2477 bounds_check(cp, index, CHECK_0);
2478 constantTag tag = cp->tag_at(index);
2479 jbyte result = tag.value();
2480 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2481 // they are changed to the corresponding tags from the JVM spec, so that java code in
2482 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2483 if (tag.is_klass_or_reference()) {
2484 result = JVM_CONSTANT_Class;
2485 } else if (tag.is_string_index()) {
2486 result = JVM_CONSTANT_String;
2487 } else if (tag.is_method_type_in_error()) {
2488 result = JVM_CONSTANT_MethodType;
2489 } else if (tag.is_method_handle_in_error()) {
2490 result = JVM_CONSTANT_MethodHandle;
2491 } else if (tag.is_dynamic_constant_in_error()) {
2492 result = JVM_CONSTANT_Dynamic;
2493 }
2494 return result;
2495 }
2496 JVM_END
2497
2498 // Assertion support. //////////////////////////////////////////////////////////
2499
2500 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2501 JVMWrapper("JVM_DesiredAssertionStatus");
2502 assert(cls != NULL, "bad class");
2503
2504 oop r = JNIHandles::resolve(cls);
2505 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2506 if (java_lang_Class::is_primitive(r)) return false;
2507
2508 Klass* k = java_lang_Class::as_Klass(r);
2509 assert(k->is_instance_klass(), "must be an instance klass");
2510 if (!k->is_instance_klass()) return false;
2511
2512 ResourceMark rm(THREAD);
2513 const char* name = k->name()->as_C_string();
2514 bool system_class = k->class_loader() == NULL;
2515 return JavaAssertions::enabled(name, system_class);
2516
2517 JVM_END
2518
2519
2520 // Return a new AssertionStatusDirectives object with the fields filled in with
2521 // command-line assertion arguments (i.e., -ea, -da).
2522 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2523 JVMWrapper("JVM_AssertionStatusDirectives");
2524 JvmtiVMObjectAllocEventCollector oam;
2525 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2526 return JNIHandles::make_local(env, asd);
2527 JVM_END
2528
2529 // Verification ////////////////////////////////////////////////////////////////////////////////
2530
2531 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2532
2533 // RedefineClasses support: bug 6214132 caused verification to fail.
2534 // All functions from this section should call the jvmtiThreadSate function:
2535 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2536 // The function returns a Klass* of the _scratch_class if the verifier
2537 // was invoked in the middle of the class redefinition.
2538 // Otherwise it returns its argument value which is the _the_class Klass*.
2539 // Please, refer to the description in the jvmtiThreadSate.hpp.
2540
2541 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2542 JVMWrapper("JVM_GetClassNameUTF");
2543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2544 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2545 return k->name()->as_utf8();
2546 JVM_END
2547
2548
2549 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2550 JVMWrapper("JVM_GetClassCPTypes");
2551 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2552 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2553 // types will have length zero if this is not an InstanceKlass
2554 // (length is determined by call to JVM_GetClassCPEntriesCount)
2555 if (k->is_instance_klass()) {
2556 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2557 for (int index = cp->length() - 1; index >= 0; index--) {
2558 constantTag tag = cp->tag_at(index);
2559 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2560 }
2561 }
2562 JVM_END
2563
2564
2565 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2566 JVMWrapper("JVM_GetClassCPEntriesCount");
2567 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2568 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2569 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2570 JVM_END
2571
2572
2573 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2574 JVMWrapper("JVM_GetClassFieldsCount");
2575 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2576 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2577 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2578 JVM_END
2579
2580
2581 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2582 JVMWrapper("JVM_GetClassMethodsCount");
2583 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2584 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2585 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2586 JVM_END
2587
2588
2589 // The following methods, used for the verifier, are never called with
2590 // array klasses, so a direct cast to InstanceKlass is safe.
2591 // Typically, these methods are called in a loop with bounds determined
2592 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2593 // zero for arrays.
2594 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2595 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2596 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2597 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2598 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2599 int length = method->checked_exceptions_length();
2600 if (length > 0) {
2601 CheckedExceptionElement* table= method->checked_exceptions_start();
2602 for (int i = 0; i < length; i++) {
2603 exceptions[i] = table[i].class_cp_index;
2604 }
2605 }
2606 JVM_END
2607
2608
2609 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2610 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2611 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2612 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2613 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2614 return method->checked_exceptions_length();
2615 JVM_END
2616
2617
2618 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2619 JVMWrapper("JVM_GetMethodIxByteCode");
2620 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2621 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2622 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2623 memcpy(code, method->code_base(), method->code_size());
2624 JVM_END
2625
2626
2627 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2628 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2629 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2630 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2631 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2632 return method->code_size();
2633 JVM_END
2634
2635
2636 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2637 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2638 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2639 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2640 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2641 ExceptionTable extable(method);
2642 entry->start_pc = extable.start_pc(entry_index);
2643 entry->end_pc = extable.end_pc(entry_index);
2644 entry->handler_pc = extable.handler_pc(entry_index);
2645 entry->catchType = extable.catch_type_index(entry_index);
2646 JVM_END
2647
2648
2649 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2650 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2651 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2652 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2653 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2654 return method->exception_table_length();
2655 JVM_END
2656
2657
2658 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2659 JVMWrapper("JVM_GetMethodIxModifiers");
2660 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2661 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2662 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2663 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2664 JVM_END
2665
2666
2667 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2668 JVMWrapper("JVM_GetFieldIxModifiers");
2669 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2670 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2671 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2672 JVM_END
2673
2674
2675 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2676 JVMWrapper("JVM_GetMethodIxLocalsCount");
2677 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2678 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2679 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2680 return method->max_locals();
2681 JVM_END
2682
2683
2684 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2685 JVMWrapper("JVM_GetMethodIxArgsSize");
2686 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2687 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2688 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2689 return method->size_of_parameters();
2690 JVM_END
2691
2692
2693 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2694 JVMWrapper("JVM_GetMethodIxMaxStack");
2695 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2696 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2697 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2698 return method->verifier_max_stack();
2699 JVM_END
2700
2701
2702 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2703 JVMWrapper("JVM_IsConstructorIx");
2704 ResourceMark rm(THREAD);
2705 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2706 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2707 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2708 return method->name() == vmSymbols::object_initializer_name();
2709 JVM_END
2710
2711
2712 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2713 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2714 ResourceMark rm(THREAD);
2715 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2716 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2717 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2718 return method->is_overpass();
2719 JVM_END
2720
2721 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2722 JVMWrapper("JVM_GetMethodIxIxUTF");
2723 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2724 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2725 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2726 return method->name()->as_utf8();
2727 JVM_END
2728
2729
2730 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2731 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2732 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2733 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2734 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2735 return method->signature()->as_utf8();
2736 JVM_END
2737
2738 /**
2739 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2740 * read entries in the constant pool. Since the old verifier always
2741 * works on a copy of the code, it will not see any rewriting that
2742 * may possibly occur in the middle of verification. So it is important
2743 * that nothing it calls tries to use the cpCache instead of the raw
2744 * constant pool, so we must use cp->uncached_x methods when appropriate.
2745 */
2746 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2747 JVMWrapper("JVM_GetCPFieldNameUTF");
2748 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2749 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2750 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2751 switch (cp->tag_at(cp_index).value()) {
2752 case JVM_CONSTANT_Fieldref:
2753 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2754 default:
2755 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2756 }
2757 ShouldNotReachHere();
2758 return NULL;
2759 JVM_END
2760
2761
2762 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2763 JVMWrapper("JVM_GetCPMethodNameUTF");
2764 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2765 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2766 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2767 switch (cp->tag_at(cp_index).value()) {
2768 case JVM_CONSTANT_InterfaceMethodref:
2769 case JVM_CONSTANT_Methodref:
2770 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2771 default:
2772 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2773 }
2774 ShouldNotReachHere();
2775 return NULL;
2776 JVM_END
2777
2778
2779 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2780 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2781 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2782 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2783 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2784 switch (cp->tag_at(cp_index).value()) {
2785 case JVM_CONSTANT_InterfaceMethodref:
2786 case JVM_CONSTANT_Methodref:
2787 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2788 default:
2789 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2790 }
2791 ShouldNotReachHere();
2792 return NULL;
2793 JVM_END
2794
2795
2796 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2797 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2798 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2799 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2800 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2801 switch (cp->tag_at(cp_index).value()) {
2802 case JVM_CONSTANT_Fieldref:
2803 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2804 default:
2805 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2806 }
2807 ShouldNotReachHere();
2808 return NULL;
2809 JVM_END
2810
2811
2812 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2813 JVMWrapper("JVM_GetCPClassNameUTF");
2814 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2815 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2816 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2817 Symbol* classname = cp->klass_name_at(cp_index);
2818 return classname->as_utf8();
2819 JVM_END
2820
2821
2822 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2823 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2824 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2825 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2826 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2827 switch (cp->tag_at(cp_index).value()) {
2828 case JVM_CONSTANT_Fieldref: {
2829 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2830 Symbol* classname = cp->klass_name_at(class_index);
2831 return classname->as_utf8();
2832 }
2833 default:
2834 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2835 }
2836 ShouldNotReachHere();
2837 return NULL;
2838 JVM_END
2839
2840
2841 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2842 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2843 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2844 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2845 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2846 switch (cp->tag_at(cp_index).value()) {
2847 case JVM_CONSTANT_Methodref:
2848 case JVM_CONSTANT_InterfaceMethodref: {
2849 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2850 Symbol* classname = cp->klass_name_at(class_index);
2851 return classname->as_utf8();
2852 }
2853 default:
2854 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2855 }
2856 ShouldNotReachHere();
2857 return NULL;
2858 JVM_END
2859
2860
2861 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2862 JVMWrapper("JVM_GetCPFieldModifiers");
2863 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2864 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2865 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2866 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2867 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2868 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2869 switch (cp->tag_at(cp_index).value()) {
2870 case JVM_CONSTANT_Fieldref: {
2871 Symbol* name = cp->uncached_name_ref_at(cp_index);
2872 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2873 InstanceKlass* ik = InstanceKlass::cast(k_called);
2874 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2875 if (fs.name() == name && fs.signature() == signature) {
2876 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2877 }
2878 }
2879 return -1;
2880 }
2881 default:
2882 fatal("JVM_GetCPFieldModifiers: illegal constant");
2883 }
2884 ShouldNotReachHere();
2885 return 0;
2886 JVM_END
2887
2888
2889 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2890 JVMWrapper("JVM_GetCPMethodModifiers");
2891 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2892 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2893 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2894 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2895 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2896 switch (cp->tag_at(cp_index).value()) {
2897 case JVM_CONSTANT_Methodref:
2898 case JVM_CONSTANT_InterfaceMethodref: {
2899 Symbol* name = cp->uncached_name_ref_at(cp_index);
2900 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2901 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2902 int methods_count = methods->length();
2903 for (int i = 0; i < methods_count; i++) {
2904 Method* method = methods->at(i);
2905 if (method->name() == name && method->signature() == signature) {
2906 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2907 }
2908 }
2909 return -1;
2910 }
2911 default:
2912 fatal("JVM_GetCPMethodModifiers: illegal constant");
2913 }
2914 ShouldNotReachHere();
2915 return 0;
2916 JVM_END
2917
2918
2919 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2920
2921 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2922 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2923 JVM_END
2924
2925
2926 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2927 JVMWrapper("JVM_IsSameClassPackage");
2928 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2929 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2930 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2931 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2932 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2933 JVM_END
2934
2935 // Printing support //////////////////////////////////////////////////
2936 extern "C" {
2937
2938 ATTRIBUTE_PRINTF(3, 0)
2939 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2940 // Reject count values that are negative signed values converted to
2941 // unsigned; see bug 4399518, 4417214
2942 if ((intptr_t)count <= 0) return -1;
2943
2944 int result = os::vsnprintf(str, count, fmt, args);
2945 if (result > 0 && (size_t)result >= count) {
2946 result = -1;
2947 }
2948
2949 return result;
2950 }
2951
2952 ATTRIBUTE_PRINTF(3, 4)
2953 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2954 va_list args;
2955 int len;
2956 va_start(args, fmt);
2957 len = jio_vsnprintf(str, count, fmt, args);
2958 va_end(args);
2959 return len;
2960 }
2961
2962 ATTRIBUTE_PRINTF(2, 3)
2963 int jio_fprintf(FILE* f, const char *fmt, ...) {
2964 int len;
2965 va_list args;
2966 va_start(args, fmt);
2967 len = jio_vfprintf(f, fmt, args);
2968 va_end(args);
2969 return len;
2970 }
2971
2972 ATTRIBUTE_PRINTF(2, 0)
2973 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2974 if (Arguments::vfprintf_hook() != NULL) {
2975 return Arguments::vfprintf_hook()(f, fmt, args);
2976 } else {
2977 return vfprintf(f, fmt, args);
2978 }
2979 }
2980
2981 ATTRIBUTE_PRINTF(1, 2)
2982 JNIEXPORT int jio_printf(const char *fmt, ...) {
2983 int len;
2984 va_list args;
2985 va_start(args, fmt);
2986 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2987 va_end(args);
2988 return len;
2989 }
2990
2991 // HotSpot specific jio method
2992 void jio_print(const char* s, size_t len) {
2993 // Try to make this function as atomic as possible.
2994 if (Arguments::vfprintf_hook() != NULL) {
2995 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2996 } else {
2997 // Make an unused local variable to avoid warning from gcc compiler.
2998 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
2999 }
3000 }
3001
3002 } // Extern C
3003
3004 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
3005
3006 // In most of the JVM thread support functions we need to access the
3007 // thread through a ThreadsListHandle to prevent it from exiting and
3008 // being reclaimed while we try to operate on it. The exceptions to this
3009 // rule are when operating on the current thread, or if the monitor of
3010 // the target java.lang.Thread is locked at the Java level - in both
3011 // cases the target cannot exit.
3012
3013 static void thread_entry(JavaThread* thread, TRAPS) {
3014 HandleMark hm(THREAD);
3015 Handle obj(THREAD, thread->threadObj());
3016 JavaValue result(T_VOID);
3017 JavaCalls::call_virtual(&result,
3018 obj,
3019 SystemDictionary::Thread_klass(),
3020 vmSymbols::run_method_name(),
3021 vmSymbols::void_method_signature(),
3022 THREAD);
3023 }
3024
3025
3026 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3027 JVMWrapper("JVM_StartThread");
3028 JavaThread *native_thread = NULL;
3029
3030 // We cannot hold the Threads_lock when we throw an exception,
3031 // due to rank ordering issues. Example: we might need to grab the
3032 // Heap_lock while we construct the exception.
3033 bool throw_illegal_thread_state = false;
3034
3035 // We must release the Threads_lock before we can post a jvmti event
3036 // in Thread::start.
3037 {
3038 // Ensure that the C++ Thread and OSThread structures aren't freed before
3039 // we operate.
3040 MutexLocker mu(Threads_lock);
3041
3042 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3043 // re-starting an already started thread, so we should usually find
3044 // that the JavaThread is null. However for a JNI attached thread
3045 // there is a small window between the Thread object being created
3046 // (with its JavaThread set) and the update to its threadStatus, so we
3047 // have to check for this
3048 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
3049 throw_illegal_thread_state = true;
3050 } else {
3051 // We could also check the stillborn flag to see if this thread was already stopped, but
3052 // for historical reasons we let the thread detect that itself when it starts running
3053
3054 jlong size =
3055 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3056 // Allocate the C++ Thread structure and create the native thread. The
3057 // stack size retrieved from java is 64-bit signed, but the constructor takes
3058 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3059 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3060 // - Avoid passing negative values which would result in really large stacks.
3061 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3062 size_t sz = size > 0 ? (size_t) size : 0;
3063 native_thread = new JavaThread(&thread_entry, sz);
3064
3065 // At this point it may be possible that no osthread was created for the
3066 // JavaThread due to lack of memory. Check for this situation and throw
3067 // an exception if necessary. Eventually we may want to change this so
3068 // that we only grab the lock if the thread was created successfully -
3069 // then we can also do this check and throw the exception in the
3070 // JavaThread constructor.
3071 if (native_thread->osthread() != NULL) {
3072 // Note: the current thread is not being used within "prepare".
3073 native_thread->prepare(jthread);
3074 }
3075 }
3076 }
3077
3078 if (throw_illegal_thread_state) {
3079 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3080 }
3081
3082 assert(native_thread != NULL, "Starting null thread?");
3083
3084 if (native_thread->osthread() == NULL) {
3085 // No one should hold a reference to the 'native_thread'.
3086 native_thread->smr_delete();
3087 if (JvmtiExport::should_post_resource_exhausted()) {
3088 JvmtiExport::post_resource_exhausted(
3089 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3090 os::native_thread_creation_failed_msg());
3091 }
3092 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3093 os::native_thread_creation_failed_msg());
3094 }
3095
3096 #if INCLUDE_JFR
3097 if (JfrRecorder::is_recording() && EventThreadStart::is_enabled() &&
3098 EventThreadStart::is_stacktrace_enabled()) {
3099 JfrThreadLocal* tl = native_thread->jfr_thread_local();
3100 // skip Thread.start() and Thread.start0()
3101 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2));
3102 }
3103 #endif
3104
3105 Thread::start(native_thread);
3106
3107 JVM_END
3108
3109
3110 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3111 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
3112 // but is thought to be reliable and simple. In the case, where the receiver is the
3113 // same thread as the sender, no VM_Operation is needed.
3114 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3115 JVMWrapper("JVM_StopThread");
3116
3117 // A nested ThreadsListHandle will grab the Threads_lock so create
3118 // tlh before we resolve throwable.
3119 ThreadsListHandle tlh(thread);
3120 oop java_throwable = JNIHandles::resolve(throwable);
3121 if (java_throwable == NULL) {
3122 THROW(vmSymbols::java_lang_NullPointerException());
3123 }
3124 oop java_thread = NULL;
3125 JavaThread* receiver = NULL;
3126 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3127 Events::log_exception(thread,
3128 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3129 p2i(receiver), p2i(java_thread), p2i(throwable));
3130
3131 if (is_alive) {
3132 // jthread refers to a live JavaThread.
3133 if (thread == receiver) {
3134 // Exception is getting thrown at self so no VM_Operation needed.
3135 THROW_OOP(java_throwable);
3136 } else {
3137 // Use a VM_Operation to throw the exception.
3138 Thread::send_async_exception(java_thread, java_throwable);
3139 }
3140 } else {
3141 // Either:
3142 // - target thread has not been started before being stopped, or
3143 // - target thread already terminated
3144 // We could read the threadStatus to determine which case it is
3145 // but that is overkill as it doesn't matter. We must set the
3146 // stillborn flag for the first case, and if the thread has already
3147 // exited setting this flag has no effect.
3148 java_lang_Thread::set_stillborn(java_thread);
3149 }
3150 JVM_END
3151
3152
3153 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3154 JVMWrapper("JVM_IsThreadAlive");
3155
3156 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3157 return java_lang_Thread::is_alive(thread_oop);
3158 JVM_END
3159
3160
3161 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3162 JVMWrapper("JVM_SuspendThread");
3163
3164 ThreadsListHandle tlh(thread);
3165 JavaThread* receiver = NULL;
3166 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3167 if (is_alive) {
3168 // jthread refers to a live JavaThread.
3169 {
3170 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3171 if (receiver->is_external_suspend()) {
3172 // Don't allow nested external suspend requests. We can't return
3173 // an error from this interface so just ignore the problem.
3174 return;
3175 }
3176 if (receiver->is_exiting()) { // thread is in the process of exiting
3177 return;
3178 }
3179 receiver->set_external_suspend();
3180 }
3181
3182 // java_suspend() will catch threads in the process of exiting
3183 // and will ignore them.
3184 receiver->java_suspend();
3185
3186 // It would be nice to have the following assertion in all the
3187 // time, but it is possible for a racing resume request to have
3188 // resumed this thread right after we suspended it. Temporarily
3189 // enable this assertion if you are chasing a different kind of
3190 // bug.
3191 //
3192 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3193 // receiver->is_being_ext_suspended(), "thread is not suspended");
3194 }
3195 JVM_END
3196
3197
3198 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3199 JVMWrapper("JVM_ResumeThread");
3200
3201 ThreadsListHandle tlh(thread);
3202 JavaThread* receiver = NULL;
3203 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3204 if (is_alive) {
3205 // jthread refers to a live JavaThread.
3206
3207 // This is the original comment for this Threads_lock grab:
3208 // We need to *always* get the threads lock here, since this operation cannot be allowed during
3209 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3210 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3211 // looks at it.
3212 //
3213 // The above comment dates back to when we had both internal and
3214 // external suspend APIs that shared a common underlying mechanism.
3215 // External suspend is now entirely cooperative and doesn't share
3216 // anything with internal suspend. That said, there are some
3217 // assumptions in the VM that an external resume grabs the
3218 // Threads_lock. We can't drop the Threads_lock grab here until we
3219 // resolve the assumptions that exist elsewhere.
3220 //
3221 MutexLocker ml(Threads_lock);
3222 receiver->java_resume();
3223 }
3224 JVM_END
3225
3226
3227 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3228 JVMWrapper("JVM_SetThreadPriority");
3229
3230 ThreadsListHandle tlh(thread);
3231 oop java_thread = NULL;
3232 JavaThread* receiver = NULL;
3233 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3234 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3235
3236 if (is_alive) {
3237 // jthread refers to a live JavaThread.
3238 Thread::set_priority(receiver, (ThreadPriority)prio);
3239 }
3240 // Implied else: If the JavaThread hasn't started yet, then the
3241 // priority set in the java.lang.Thread object above will be pushed
3242 // down when it does start.
3243 JVM_END
3244
3245
3246 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3247 JVMWrapper("JVM_Yield");
3248 if (os::dont_yield()) return;
3249 HOTSPOT_THREAD_YIELD();
3250 os::naked_yield();
3251 JVM_END
3252
3253 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3254 assert(event != NULL, "invariant");
3255 assert(event->should_commit(), "invariant");
3256 event->set_time(millis);
3257 event->commit();
3258 }
3259
3260 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3261 JVMWrapper("JVM_Sleep");
3262
3263 if (millis < 0) {
3264 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3265 }
3266
3267 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3268 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3269 }
3270
3271 // Save current thread state and restore it at the end of this block.
3272 // And set new thread state to SLEEPING.
3273 JavaThreadSleepState jtss(thread);
3274
3275 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3276 EventThreadSleep event;
3277
3278 if (millis == 0) {
3279 os::naked_yield();
3280 } else {
3281 ThreadState old_state = thread->osthread()->get_state();
3282 thread->osthread()->set_state(SLEEPING);
3283 if (!thread->sleep(millis)) { // interrupted
3284 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3285 // us while we were sleeping. We do not overwrite those.
3286 if (!HAS_PENDING_EXCEPTION) {
3287 if (event.should_commit()) {
3288 post_thread_sleep_event(&event, millis);
3289 }
3290 HOTSPOT_THREAD_SLEEP_END(1);
3291
3292 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3293 // to properly restore the thread state. That's likely wrong.
3294 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3295 }
3296 }
3297 thread->osthread()->set_state(old_state);
3298 }
3299 if (event.should_commit()) {
3300 post_thread_sleep_event(&event, millis);
3301 }
3302 HOTSPOT_THREAD_SLEEP_END(0);
3303 JVM_END
3304
3305 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3306 JVMWrapper("JVM_CurrentThread");
3307 oop jthread = thread->threadObj();
3308 assert (thread != NULL, "no current thread!");
3309 return JNIHandles::make_local(env, jthread);
3310 JVM_END
3311
3312 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3313 JVMWrapper("JVM_Interrupt");
3314
3315 ThreadsListHandle tlh(thread);
3316 JavaThread* receiver = NULL;
3317 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3318 if (is_alive) {
3319 // jthread refers to a live JavaThread.
3320 receiver->interrupt();
3321 }
3322 JVM_END
3323
3324
3325 // Return true iff the current thread has locked the object passed in
3326
3327 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3328 JVMWrapper("JVM_HoldsLock");
3329 assert(THREAD->is_Java_thread(), "sanity check");
3330 if (obj == NULL) {
3331 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3332 }
3333 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3334 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3335 JVM_END
3336
3337
3338 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3339 JVMWrapper("JVM_DumpAllStacks");
3340 VM_PrintThreads op;
3341 VMThread::execute(&op);
3342 if (JvmtiExport::should_post_data_dump()) {
3343 JvmtiExport::post_data_dump();
3344 }
3345 JVM_END
3346
3347 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3348 JVMWrapper("JVM_SetNativeThreadName");
3349
3350 // We don't use a ThreadsListHandle here because the current thread
3351 // must be alive.
3352 oop java_thread = JNIHandles::resolve_non_null(jthread);
3353 JavaThread* thr = java_lang_Thread::thread(java_thread);
3354 if (thread == thr && !thr->has_attached_via_jni()) {
3355 // Thread naming is only supported for the current thread and
3356 // we don't set the name of an attached thread to avoid stepping
3357 // on other programs.
3358 ResourceMark rm(thread);
3359 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3360 os::set_native_thread_name(thread_name);
3361 }
3362 JVM_END
3363
3364 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3365
3366 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3367 JVMWrapper("JVM_GetClassContext");
3368 ResourceMark rm(THREAD);
3369 JvmtiVMObjectAllocEventCollector oam;
3370 vframeStream vfst(thread);
3371
3372 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3373 // This must only be called from SecurityManager.getClassContext
3374 Method* m = vfst.method();
3375 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3376 m->name() == vmSymbols::getClassContext_name() &&
3377 m->signature() == vmSymbols::void_class_array_signature())) {
3378 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3379 }
3380 }
3381
3382 // Collect method holders
3383 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3384 for (; !vfst.at_end(); vfst.security_next()) {
3385 Method* m = vfst.method();
3386 // Native frames are not returned
3387 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3388 Klass* holder = m->method_holder();
3389 assert(holder->is_klass(), "just checking");
3390 klass_array->append(holder);
3391 }
3392 }
3393
3394 // Create result array of type [Ljava/lang/Class;
3395 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3396 // Fill in mirrors corresponding to method holders
3397 for (int i = 0; i < klass_array->length(); i++) {
3398 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3399 }
3400
3401 return (jobjectArray) JNIHandles::make_local(env, result);
3402 JVM_END
3403
3404
3405 // java.lang.Package ////////////////////////////////////////////////////////////////
3406
3407
3408 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3409 JVMWrapper("JVM_GetSystemPackage");
3410 ResourceMark rm(THREAD);
3411 JvmtiVMObjectAllocEventCollector oam;
3412 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3413 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3414 return (jstring) JNIHandles::make_local(result);
3415 JVM_END
3416
3417
3418 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3419 JVMWrapper("JVM_GetSystemPackages");
3420 JvmtiVMObjectAllocEventCollector oam;
3421 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3422 return (jobjectArray) JNIHandles::make_local(result);
3423 JVM_END
3424
3425
3426 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3427
3428
3429 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3430 JVMWrapper("JVM_GetAndClearReferencePendingList");
3431
3432 MonitorLocker ml(Heap_lock);
3433 oop ref = Universe::reference_pending_list();
3434 if (ref != NULL) {
3435 Universe::set_reference_pending_list(NULL);
3436 }
3437 return JNIHandles::make_local(env, ref);
3438 JVM_END
3439
3440 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3441 JVMWrapper("JVM_HasReferencePendingList");
3442 MonitorLocker ml(Heap_lock);
3443 return Universe::has_reference_pending_list();
3444 JVM_END
3445
3446 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3447 JVMWrapper("JVM_WaitForReferencePendingList");
3448 MonitorLocker ml(Heap_lock);
3449 while (!Universe::has_reference_pending_list()) {
3450 ml.wait();
3451 }
3452 JVM_END
3453
3454
3455 // ObjectInputStream ///////////////////////////////////////////////////////////////
3456
3457 // Return the first user-defined class loader up the execution stack, or null
3458 // if only code from the bootstrap or platform class loader is on the stack.
3459
3460 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3461 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3462 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3463 oop loader = vfst.method()->method_holder()->class_loader();
3464 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3465 return JNIHandles::make_local(env, loader);
3466 }
3467 }
3468 return NULL;
3469 JVM_END
3470
3471
3472 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3473
3474
3475 // resolve array handle and check arguments
3476 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3477 if (arr == NULL) {
3478 THROW_0(vmSymbols::java_lang_NullPointerException());
3479 }
3480 oop a = JNIHandles::resolve_non_null(arr);
3481 if (!a->is_array()) {
3482 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3483 } else if (type_array_only && !a->is_typeArray()) {
3484 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3485 }
3486 return arrayOop(a);
3487 }
3488
3489
3490 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3491 JVMWrapper("JVM_GetArrayLength");
3492 arrayOop a = check_array(env, arr, false, CHECK_0);
3493 return a->length();
3494 JVM_END
3495
3496
3497 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3498 JVMWrapper("JVM_Array_Get");
3499 JvmtiVMObjectAllocEventCollector oam;
3500 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3501 jvalue value;
3502 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3503 oop box = Reflection::box(&value, type, CHECK_NULL);
3504 return JNIHandles::make_local(env, box);
3505 JVM_END
3506
3507
3508 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3509 JVMWrapper("JVM_GetPrimitiveArrayElement");
3510 jvalue value;
3511 value.i = 0; // to initialize value before getting used in CHECK
3512 arrayOop a = check_array(env, arr, true, CHECK_(value));
3513 assert(a->is_typeArray(), "just checking");
3514 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3515 BasicType wide_type = (BasicType) wCode;
3516 if (type != wide_type) {
3517 Reflection::widen(&value, type, wide_type, CHECK_(value));
3518 }
3519 return value;
3520 JVM_END
3521
3522
3523 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3524 JVMWrapper("JVM_SetArrayElement");
3525 arrayOop a = check_array(env, arr, false, CHECK);
3526 oop box = JNIHandles::resolve(val);
3527 jvalue value;
3528 value.i = 0; // to initialize value before getting used in CHECK
3529 BasicType value_type;
3530 if (a->is_objArray()) {
3531 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3532 value_type = Reflection::unbox_for_regular_object(box, &value);
3533 } else {
3534 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3535 }
3536 Reflection::array_set(&value, a, index, value_type, CHECK);
3537 JVM_END
3538
3539
3540 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3541 JVMWrapper("JVM_SetPrimitiveArrayElement");
3542 arrayOop a = check_array(env, arr, true, CHECK);
3543 assert(a->is_typeArray(), "just checking");
3544 BasicType value_type = (BasicType) vCode;
3545 Reflection::array_set(&v, a, index, value_type, CHECK);
3546 JVM_END
3547
3548
3549 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3550 JVMWrapper("JVM_NewArray");
3551 JvmtiVMObjectAllocEventCollector oam;
3552 oop element_mirror = JNIHandles::resolve(eltClass);
3553 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3554 return JNIHandles::make_local(env, result);
3555 JVM_END
3556
3557
3558 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3559 JVMWrapper("JVM_NewMultiArray");
3560 JvmtiVMObjectAllocEventCollector oam;
3561 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3562 oop element_mirror = JNIHandles::resolve(eltClass);
3563 assert(dim_array->is_typeArray(), "just checking");
3564 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3565 return JNIHandles::make_local(env, result);
3566 JVM_END
3567
3568
3569 // Library support ///////////////////////////////////////////////////////////////////////////
3570
3571 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3572 //%note jvm_ct
3573 JVMWrapper("JVM_LoadLibrary");
3574 char ebuf[1024];
3575 void *load_result;
3576 {
3577 ThreadToNativeFromVM ttnfvm(thread);
3578 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3579 }
3580 if (load_result == NULL) {
3581 char msg[1024];
3582 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3583 // Since 'ebuf' may contain a string encoded using
3584 // platform encoding scheme, we need to pass
3585 // Exceptions::unsafe_to_utf8 to the new_exception method
3586 // as the last argument. See bug 6367357.
3587 Handle h_exception =
3588 Exceptions::new_exception(thread,
3589 vmSymbols::java_lang_UnsatisfiedLinkError(),
3590 msg, Exceptions::unsafe_to_utf8);
3591
3592 THROW_HANDLE_0(h_exception);
3593 }
3594 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3595 return load_result;
3596 JVM_END
3597
3598
3599 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3600 JVMWrapper("JVM_UnloadLibrary");
3601 os::dll_unload(handle);
3602 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3603 JVM_END
3604
3605
3606 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3607 JVMWrapper("JVM_FindLibraryEntry");
3608 void* find_result = os::dll_lookup(handle, name);
3609 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3610 find_result != NULL ? "Found" : "Failed to find",
3611 name, p2i(handle));
3612 return find_result;
3613 JVM_END
3614
3615
3616 // JNI version ///////////////////////////////////////////////////////////////////////////////
3617
3618 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3619 JVMWrapper("JVM_IsSupportedJNIVersion");
3620 return Threads::is_supported_jni_version_including_1_1(version);
3621 JVM_END
3622
3623
3624 // String support ///////////////////////////////////////////////////////////////////////////
3625
3626 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3627 JVMWrapper("JVM_InternString");
3628 JvmtiVMObjectAllocEventCollector oam;
3629 if (str == NULL) return NULL;
3630 oop string = JNIHandles::resolve_non_null(str);
3631 oop result = StringTable::intern(string, CHECK_NULL);
3632 return (jstring) JNIHandles::make_local(env, result);
3633 JVM_END
3634
3635
3636 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3637
3638 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3639 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3640 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3641 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3642 // nature. JavaThreads will be "in native" when using this API from JDK code.
3643
3644
3645 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3646 VM_Exit::block_if_vm_exited();
3647 JVMWrapper("JVM_RawMonitorCreate");
3648 return new os::PlatformMutex();
3649 }
3650
3651
3652 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3653 VM_Exit::block_if_vm_exited();
3654 JVMWrapper("JVM_RawMonitorDestroy");
3655 delete ((os::PlatformMutex*) mon);
3656 }
3657
3658
3659 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3660 VM_Exit::block_if_vm_exited();
3661 JVMWrapper("JVM_RawMonitorEnter");
3662 ((os::PlatformMutex*) mon)->lock();
3663 return 0;
3664 }
3665
3666
3667 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3668 VM_Exit::block_if_vm_exited();
3669 JVMWrapper("JVM_RawMonitorExit");
3670 ((os::PlatformMutex*) mon)->unlock();
3671 }
3672
3673
3674 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3675
3676 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3677 Handle loader, Handle protection_domain,
3678 jboolean throwError, TRAPS) {
3679 // Security Note:
3680 // The Java level wrapper will perform the necessary security check allowing
3681 // us to pass the NULL as the initiating class loader. The VM is responsible for
3682 // the checkPackageAccess relative to the initiating class loader via the
3683 // protection_domain. The protection_domain is passed as NULL by the java code
3684 // if there is no security manager in 3-arg Class.forName().
3685 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3686
3687 // Check if we should initialize the class
3688 if (init && klass->is_instance_klass()) {
3689 klass->initialize(CHECK_NULL);
3690 }
3691 return (jclass) JNIHandles::make_local(env, klass->java_mirror());
3692 }
3693
3694
3695 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3696
3697 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3698 JVMWrapper("JVM_InvokeMethod");
3699 Handle method_handle;
3700 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3701 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3702 Handle receiver(THREAD, JNIHandles::resolve(obj));
3703 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3704 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3705 jobject res = JNIHandles::make_local(env, result);
3706 if (JvmtiExport::should_post_vm_object_alloc()) {
3707 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3708 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3709 if (java_lang_Class::is_primitive(ret_type)) {
3710 // Only for primitive type vm allocates memory for java object.
3711 // See box() method.
3712 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3713 }
3714 }
3715 return res;
3716 } else {
3717 THROW_0(vmSymbols::java_lang_StackOverflowError());
3718 }
3719 JVM_END
3720
3721
3722 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3723 JVMWrapper("JVM_NewInstanceFromConstructor");
3724 oop constructor_mirror = JNIHandles::resolve(c);
3725 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3726 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3727 jobject res = JNIHandles::make_local(env, result);
3728 if (JvmtiExport::should_post_vm_object_alloc()) {
3729 JvmtiExport::post_vm_object_alloc(JavaThread::current(), result);
3730 }
3731 return res;
3732 JVM_END
3733
3734 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3735
3736 JVM_LEAF(jboolean, JVM_SupportsCX8())
3737 JVMWrapper("JVM_SupportsCX8");
3738 return VM_Version::supports_cx8();
3739 JVM_END
3740
3741 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3742 JVMWrapper("JVM_InitializeFromArchive");
3743 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3744 assert(k->is_klass(), "just checking");
3745 HeapShared::initialize_from_archived_subgraph(k);
3746 JVM_END
3747
3748 // Returns an array of all live Thread objects (VM internal JavaThreads,
3749 // jvmti agent threads, and JNI attaching threads are skipped)
3750 // See CR 6404306 regarding JNI attaching threads
3751 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3752 ResourceMark rm(THREAD);
3753 ThreadsListEnumerator tle(THREAD, false, false);
3754 JvmtiVMObjectAllocEventCollector oam;
3755
3756 int num_threads = tle.num_threads();
3757 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3758 objArrayHandle threads_ah(THREAD, r);
3759
3760 for (int i = 0; i < num_threads; i++) {
3761 Handle h = tle.get_threadObj(i);
3762 threads_ah->obj_at_put(i, h());
3763 }
3764
3765 return (jobjectArray) JNIHandles::make_local(env, threads_ah());
3766 JVM_END
3767
3768
3769 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3770 // Return StackTraceElement[][], each element is the stack trace of a thread in
3771 // the corresponding entry in the given threads array
3772 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3773 JVMWrapper("JVM_DumpThreads");
3774 JvmtiVMObjectAllocEventCollector oam;
3775
3776 // Check if threads is null
3777 if (threads == NULL) {
3778 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3779 }
3780
3781 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3782 objArrayHandle ah(THREAD, a);
3783 int num_threads = ah->length();
3784 // check if threads is non-empty array
3785 if (num_threads == 0) {
3786 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3787 }
3788
3789 // check if threads is not an array of objects of Thread class
3790 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3791 if (k != SystemDictionary::Thread_klass()) {
3792 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3793 }
3794
3795 ResourceMark rm(THREAD);
3796
3797 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3798 for (int i = 0; i < num_threads; i++) {
3799 oop thread_obj = ah->obj_at(i);
3800 instanceHandle h(THREAD, (instanceOop) thread_obj);
3801 thread_handle_array->append(h);
3802 }
3803
3804 // The JavaThread references in thread_handle_array are validated
3805 // in VM_ThreadDump::doit().
3806 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3807 return (jobjectArray)JNIHandles::make_local(env, stacktraces());
3808
3809 JVM_END
3810
3811 // JVM monitoring and management support
3812 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3813 return Management::get_jmm_interface(version);
3814 JVM_END
3815
3816 // com.sun.tools.attach.VirtualMachine agent properties support
3817 //
3818 // Initialize the agent properties with the properties maintained in the VM
3819 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3820 JVMWrapper("JVM_InitAgentProperties");
3821 ResourceMark rm;
3822
3823 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3824
3825 PUTPROP(props, "sun.java.command", Arguments::java_command());
3826 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3827 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3828 return properties;
3829 JVM_END
3830
3831 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3832 {
3833 JVMWrapper("JVM_GetEnclosingMethodInfo");
3834 JvmtiVMObjectAllocEventCollector oam;
3835
3836 if (ofClass == NULL) {
3837 return NULL;
3838 }
3839 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3840 // Special handling for primitive objects
3841 if (java_lang_Class::is_primitive(mirror())) {
3842 return NULL;
3843 }
3844 Klass* k = java_lang_Class::as_Klass(mirror());
3845 if (!k->is_instance_klass()) {
3846 return NULL;
3847 }
3848 InstanceKlass* ik = InstanceKlass::cast(k);
3849 int encl_method_class_idx = ik->enclosing_method_class_index();
3850 if (encl_method_class_idx == 0) {
3851 return NULL;
3852 }
3853 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
3854 objArrayHandle dest(THREAD, dest_o);
3855 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3856 dest->obj_at_put(0, enc_k->java_mirror());
3857 int encl_method_method_idx = ik->enclosing_method_method_index();
3858 if (encl_method_method_idx != 0) {
3859 Symbol* sym = ik->constants()->symbol_at(
3860 extract_low_short_from_int(
3861 ik->constants()->name_and_type_at(encl_method_method_idx)));
3862 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3863 dest->obj_at_put(1, str());
3864 sym = ik->constants()->symbol_at(
3865 extract_high_short_from_int(
3866 ik->constants()->name_and_type_at(encl_method_method_idx)));
3867 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3868 dest->obj_at_put(2, str());
3869 }
3870 return (jobjectArray) JNIHandles::make_local(dest());
3871 }
3872 JVM_END
3873
3874 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3875 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3876 ResourceMark rm(THREAD);
3877
3878 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3879 return NULL;
3880 }
3881
3882 char** vm_flags = Arguments::jvm_flags_array();
3883 char** vm_args = Arguments::jvm_args_array();
3884 int num_flags = Arguments::num_jvm_flags();
3885 int num_args = Arguments::num_jvm_args();
3886
3887 InstanceKlass* ik = SystemDictionary::String_klass();
3888 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3889 objArrayHandle result_h(THREAD, r);
3890
3891 int index = 0;
3892 for (int j = 0; j < num_flags; j++, index++) {
3893 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3894 result_h->obj_at_put(index, h());
3895 }
3896 for (int i = 0; i < num_args; i++, index++) {
3897 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3898 result_h->obj_at_put(index, h());
3899 }
3900 return (jobjectArray) JNIHandles::make_local(env, result_h());
3901 JVM_END
3902
3903 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
3904 return os::get_signal_number(name);
3905 JVM_END