1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/javaAssertions.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/modules.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/stringTable.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "gc/shared/collectedHeap.inline.hpp"
41 #include "interpreter/bytecode.hpp"
42 #include "interpreter/bytecodeUtils.hpp"
43 #include "jfr/jfrEvents.hpp"
44 #include "logging/log.hpp"
45 #include "memory/dynamicArchive.hpp"
46 #include "memory/heapShared.hpp"
47 #include "memory/lambdaFormInvokers.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/referenceType.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "oops/access.inline.hpp"
53 #include "oops/constantPool.hpp"
54 #include "oops/fieldStreams.inline.hpp"
55 #include "oops/instanceKlass.hpp"
56 #include "oops/method.hpp"
57 #include "oops/recordComponent.hpp"
58 #include "oops/objArrayKlass.hpp"
59 #include "oops/objArrayOop.inline.hpp"
60 #include "oops/oop.inline.hpp"
61 #include "prims/jvm_misc.hpp"
62 #include "prims/jvmtiExport.hpp"
63 #include "prims/jvmtiThreadState.hpp"
64 #include "prims/nativeLookup.hpp"
65 #include "prims/stackwalk.hpp"
66 #include "runtime/arguments.hpp"
67 #include "runtime/atomic.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/init.hpp"
70 #include "runtime/interfaceSupport.inline.hpp"
71 #include "runtime/deoptimization.hpp"
72 #include "runtime/handshake.hpp"
73 #include "runtime/java.hpp"
74 #include "runtime/javaCalls.hpp"
75 #include "runtime/jfieldIDWorkaround.hpp"
76 #include "runtime/jniHandles.inline.hpp"
77 #include "runtime/os.inline.hpp"
78 #include "runtime/perfData.hpp"
79 #include "runtime/reflection.hpp"
80 #include "runtime/synchronizer.hpp"
81 #include "runtime/thread.inline.hpp"
82 #include "runtime/threadSMR.hpp"
83 #include "runtime/vframe.inline.hpp"
84 #include "runtime/vmOperations.hpp"
85 #include "runtime/vm_version.hpp"
86 #include "services/attachListener.hpp"
87 #include "services/management.hpp"
88 #include "services/threadService.hpp"
89 #include "utilities/copy.hpp"
90 #include "utilities/defaultStream.hpp"
91 #include "utilities/dtrace.hpp"
92 #include "utilities/events.hpp"
93 #include "utilities/histogram.hpp"
94 #include "utilities/macros.hpp"
95 #include "utilities/utf8.hpp"
96 #if INCLUDE_CDS
97 #include "classfile/systemDictionaryShared.hpp"
98 #endif
99 #if INCLUDE_JFR
100 #include "jfr/jfr.hpp"
101 #endif
102
103 #include <errno.h>
104
105 /*
106 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
107 such ctors and calls MUST NOT come between an oop declaration/init and its
108 usage because if objects are move this may cause various memory stomps, bus
109 errors and segfaults. Here is a cookbook for causing so called "naked oop
110 failures":
111
112 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
113 JVMWrapper("JVM_GetClassDeclaredFields");
114
115 // Object address to be held directly in mirror & not visible to GC
116 oop mirror = JNIHandles::resolve_non_null(ofClass);
117
118 // If this ctor can hit a safepoint, moving objects around, then
119 ComplexConstructor foo;
120
121 // Boom! mirror may point to JUNK instead of the intended object
122 (some dereference of mirror)
123
124 // Here's another call that may block for GC, making mirror stale
125 MutexLocker ml(some_lock);
126
127 // And here's an initializer that can result in a stale oop
128 // all in one step.
129 oop o = call_that_can_throw_exception(TRAPS);
130
131
132 The solution is to keep the oop declaration BELOW the ctor or function
133 call that might cause a GC, do another resolve to reassign the oop, or
134 consider use of a Handle instead of an oop so there is immunity from object
135 motion. But note that the "QUICK" entries below do not have a handlemark
136 and thus can only support use of handles passed in.
137 */
138
139 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
140 ResourceMark rm;
141 int line_number = -1;
142 const char * source_file = NULL;
143 const char * trace = "explicit";
144 InstanceKlass* caller = NULL;
145 JavaThread* jthread = (JavaThread*) THREAD;
146 if (jthread->has_last_Java_frame()) {
147 vframeStream vfst(jthread);
148
149 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
150 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
151 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
152 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
153 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
154
155 Method* last_caller = NULL;
156
157 while (!vfst.at_end()) {
158 Method* m = vfst.method();
159 if (!vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass())&&
160 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
161 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
162 break;
163 }
164 last_caller = m;
165 vfst.next();
166 }
167 // if this is called from Class.forName0 and that is called from Class.forName,
168 // then print the caller of Class.forName. If this is Class.loadClass, then print
169 // that caller, otherwise keep quiet since this should be picked up elsewhere.
170 bool found_it = false;
171 if (!vfst.at_end() &&
172 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
173 vfst.method()->name() == vmSymbols::forName0_name()) {
174 vfst.next();
175 if (!vfst.at_end() &&
176 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
177 vfst.method()->name() == vmSymbols::forName_name()) {
178 vfst.next();
179 found_it = true;
180 }
181 } else if (last_caller != NULL &&
182 last_caller->method_holder()->name() ==
183 vmSymbols::java_lang_ClassLoader() &&
184 last_caller->name() == vmSymbols::loadClass_name()) {
185 found_it = true;
186 } else if (!vfst.at_end()) {
187 if (vfst.method()->is_native()) {
188 // JNI call
189 found_it = true;
190 }
191 }
192 if (found_it && !vfst.at_end()) {
193 // found the caller
194 caller = vfst.method()->method_holder();
195 line_number = vfst.method()->line_number_from_bci(vfst.bci());
196 if (line_number == -1) {
197 // show method name if it's a native method
198 trace = vfst.method()->name_and_sig_as_C_string();
199 }
200 Symbol* s = caller->source_file_name();
201 if (s != NULL) {
202 source_file = s->as_C_string();
203 }
204 }
205 }
206 if (caller != NULL) {
207 if (to_class != caller) {
208 const char * from = caller->external_name();
209 const char * to = to_class->external_name();
210 // print in a single call to reduce interleaving between threads
211 if (source_file != NULL) {
212 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
213 } else {
214 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
215 }
216 }
217 }
218 }
219
220 void trace_class_resolution(Klass* to_class) {
221 EXCEPTION_MARK;
222 trace_class_resolution_impl(to_class, THREAD);
223 if (HAS_PENDING_EXCEPTION) {
224 CLEAR_PENDING_EXCEPTION;
225 }
226 }
227
228 // Wrapper to trace JVM functions
229
230 #ifdef ASSERT
231 Histogram* JVMHistogram;
232 volatile int JVMHistogram_lock = 0;
233
234 class JVMHistogramElement : public HistogramElement {
235 public:
236 JVMHistogramElement(const char* name);
237 };
238
239 JVMHistogramElement::JVMHistogramElement(const char* elementName) {
240 _name = elementName;
241 uintx count = 0;
242
243 while (Atomic::cmpxchg(&JVMHistogram_lock, 0, 1) != 0) {
244 while (Atomic::load_acquire(&JVMHistogram_lock) != 0) {
245 count +=1;
246 if ( (WarnOnStalledSpinLock > 0)
247 && (count % WarnOnStalledSpinLock == 0)) {
248 warning("JVMHistogram_lock seems to be stalled");
249 }
250 }
251 }
252
253 if(JVMHistogram == NULL)
254 JVMHistogram = new Histogram("JVM Call Counts",100);
255
256 JVMHistogram->add_element(this);
257 Atomic::dec(&JVMHistogram_lock);
258 }
259
260 #define JVMCountWrapper(arg) \
261 static JVMHistogramElement* e = new JVMHistogramElement(arg); \
262 if (e != NULL) e->increment_count(); // Due to bug in VC++, we need a NULL check here eventhough it should never happen!
263
264 #define JVMWrapper(arg) JVMCountWrapper(arg);
265 #else
266 #define JVMWrapper(arg)
267 #endif
268
269
270 // Interface version /////////////////////////////////////////////////////////////////////
271
272
273 JVM_LEAF(jint, JVM_GetInterfaceVersion())
274 return JVM_INTERFACE_VERSION;
275 JVM_END
276
277
278 // java.lang.System //////////////////////////////////////////////////////////////////////
279
280
281 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
282 JVMWrapper("JVM_CurrentTimeMillis");
283 return os::javaTimeMillis();
284 JVM_END
285
286 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
287 JVMWrapper("JVM_NanoTime");
288 return os::javaTimeNanos();
289 JVM_END
290
291 // The function below is actually exposed by jdk.internal.misc.VM and not
292 // java.lang.System, but we choose to keep it here so that it stays next
293 // to JVM_CurrentTimeMillis and JVM_NanoTime
294
295 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
296 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
297
298 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
299 JVMWrapper("JVM_GetNanoTimeAdjustment");
300 jlong seconds;
301 jlong nanos;
302
303 os::javaTimeSystemUTC(seconds, nanos);
304
305 // We're going to verify that the result can fit in a long.
306 // For that we need the difference in seconds between 'seconds'
307 // and 'offset_secs' to be such that:
308 // |seconds - offset_secs| < (2^63/10^9)
309 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
310 // which makes |seconds - offset_secs| < 2^33
311 // and we will prefer +/- 2^32 as the maximum acceptable diff
312 // as 2^32 has a more natural feel than 2^33...
313 //
314 // So if |seconds - offset_secs| >= 2^32 - we return a special
315 // sentinel value (-1) which the caller should take as an
316 // exception value indicating that the offset given to us is
317 // too far from range of the current time - leading to too big
318 // a nano adjustment. The caller is expected to recover by
319 // computing a more accurate offset and calling this method
320 // again. (For the record 2^32 secs is ~136 years, so that
321 // should rarely happen)
322 //
323 jlong diff = seconds - offset_secs;
324 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
325 return -1; // sentinel value: the offset is too far off the target
326 }
327
328 // return the adjustment. If you compute a time by adding
329 // this number of nanoseconds along with the number of seconds
330 // in the offset you should get the current UTC time.
331 return (diff * (jlong)1000000000) + nanos;
332 JVM_END
333
334 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
335 jobject dst, jint dst_pos, jint length))
336 JVMWrapper("JVM_ArrayCopy");
337 // Check if we have null pointers
338 if (src == NULL || dst == NULL) {
339 THROW(vmSymbols::java_lang_NullPointerException());
340 }
341 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
342 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
343 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
344 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
345 // Do copy
346 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
347 JVM_END
348
349
350 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
351 JavaValue r(T_OBJECT);
352 // public synchronized Object put(Object key, Object value);
353 HandleMark hm(THREAD);
354 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
355 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
356 JavaCalls::call_virtual(&r,
357 props,
358 SystemDictionary::Properties_klass(),
359 vmSymbols::put_name(),
360 vmSymbols::object_object_object_signature(),
361 key_str,
362 value_str,
363 THREAD);
364 }
365
366
367 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
368
369 /*
370 * Return all of the system properties in a Java String array with alternating
371 * names and values from the jvm SystemProperty.
372 * Which includes some internal and all commandline -D defined properties.
373 */
374 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
375 JVMWrapper("JVM_GetProperties");
376 ResourceMark rm(THREAD);
377 HandleMark hm(THREAD);
378 int ndx = 0;
379 int fixedCount = 2;
380
381 SystemProperty* p = Arguments::system_properties();
382 int count = Arguments::PropertyList_count(p);
383
384 // Allocate result String array
385 InstanceKlass* ik = SystemDictionary::String_klass();
386 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
387 objArrayHandle result_h(THREAD, r);
388
389 while (p != NULL) {
390 const char * key = p->key();
391 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
392 const char * value = p->value();
393 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
394 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
395 result_h->obj_at_put(ndx * 2, key_str());
396 result_h->obj_at_put(ndx * 2 + 1, value_str());
397 ndx++;
398 }
399 p = p->next();
400 }
401
402 // Convert the -XX:MaxDirectMemorySize= command line flag
403 // to the sun.nio.MaxDirectMemorySize property.
404 // Do this after setting user properties to prevent people
405 // from setting the value with a -D option, as requested.
406 // Leave empty if not supplied
407 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
408 char as_chars[256];
409 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
410 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
411 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
412 result_h->obj_at_put(ndx * 2, key_str());
413 result_h->obj_at_put(ndx * 2 + 1, value_str());
414 ndx++;
415 }
416
417 // JVM monitoring and management support
418 // Add the sun.management.compiler property for the compiler's name
419 {
420 #undef CSIZE
421 #if defined(_LP64) || defined(_WIN64)
422 #define CSIZE "64-Bit "
423 #else
424 #define CSIZE
425 #endif // 64bit
426
427 #ifdef TIERED
428 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
429 #else
430 #if defined(COMPILER1)
431 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
432 #elif defined(COMPILER2)
433 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
434 #elif INCLUDE_JVMCI
435 #error "INCLUDE_JVMCI should imply TIERED"
436 #else
437 const char* compiler_name = "";
438 #endif // compilers
439 #endif // TIERED
440
441 if (*compiler_name != '\0' &&
442 (Arguments::mode() != Arguments::_int)) {
443 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
444 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
445 result_h->obj_at_put(ndx * 2, key_str());
446 result_h->obj_at_put(ndx * 2 + 1, value_str());
447 ndx++;
448 }
449 }
450
451 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
452 JVM_END
453
454
455 /*
456 * Return the temporary directory that the VM uses for the attach
457 * and perf data files.
458 *
459 * It is important that this directory is well-known and the
460 * same for all VM instances. It cannot be affected by configuration
461 * variables such as java.io.tmpdir.
462 */
463 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
464 JVMWrapper("JVM_GetTemporaryDirectory");
465 HandleMark hm(THREAD);
466 const char* temp_dir = os::get_temp_directory();
467 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
468 return (jstring) JNIHandles::make_local(THREAD, h());
469 JVM_END
470
471
472 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
473
474 extern volatile jint vm_created;
475
476 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
477 JVMWrapper("JVM_BeforeHalt");
478 // Link all classes for dynamic CDS dumping before vm exit.
479 if (DynamicDumpSharedSpaces) {
480 MetaspaceShared::link_and_cleanup_shared_classes(THREAD);
481 }
482 EventShutdown event;
483 if (event.should_commit()) {
484 event.set_reason("Shutdown requested from Java");
485 event.commit();
486 }
487 JVM_END
488
489
490 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
491 before_exit(thread);
492 vm_exit(code);
493 JVM_END
494
495
496 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
497 JVMWrapper("JVM_GC");
498 if (!DisableExplicitGC) {
499 Universe::heap()->collect(GCCause::_java_lang_system_gc);
500 }
501 JVM_END
502
503
504 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
505 JVMWrapper("JVM_MaxObjectInspectionAge");
506 return Universe::heap()->millis_since_last_whole_heap_examined();
507 JVM_END
508
509
510 static inline jlong convert_size_t_to_jlong(size_t val) {
511 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
512 NOT_LP64 (return (jlong)val;)
513 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
514 }
515
516 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
517 JVMWrapper("JVM_TotalMemory");
518 size_t n = Universe::heap()->capacity();
519 return convert_size_t_to_jlong(n);
520 JVM_END
521
522
523 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
524 JVMWrapper("JVM_FreeMemory");
525 size_t n = Universe::heap()->unused();
526 return convert_size_t_to_jlong(n);
527 JVM_END
528
529
530 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
531 JVMWrapper("JVM_MaxMemory");
532 size_t n = Universe::heap()->max_capacity();
533 return convert_size_t_to_jlong(n);
534 JVM_END
535
536
537 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
538 JVMWrapper("JVM_ActiveProcessorCount");
539 return os::active_processor_count();
540 JVM_END
541
542 JVM_ENTRY_NO_ENV(jboolean, JVM_IsUseContainerSupport(void))
543 JVMWrapper("JVM_IsUseContainerSupport");
544 #ifdef LINUX
545 if (UseContainerSupport) {
546 return JNI_TRUE;
547 }
548 #endif
549 return JNI_FALSE;
550 JVM_END
551
552 // java.lang.Throwable //////////////////////////////////////////////////////
553
554 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
555 JVMWrapper("JVM_FillInStackTrace");
556 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
557 java_lang_Throwable::fill_in_stack_trace(exception);
558 JVM_END
559
560 // java.lang.NullPointerException ///////////////////////////////////////////
561
562 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
563 if (!ShowCodeDetailsInExceptionMessages) return NULL;
564
565 oop exc = JNIHandles::resolve_non_null(throwable);
566
567 Method* method;
568 int bci;
569 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
570 return NULL;
571 }
572 if (method->is_native()) {
573 return NULL;
574 }
575
576 stringStream ss;
577 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
578 if (ok) {
579 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
580 return (jstring) JNIHandles::make_local(THREAD, result);
581 } else {
582 return NULL;
583 }
584 JVM_END
585
586 // java.lang.StackTraceElement //////////////////////////////////////////////
587
588
589 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
590 JVMWrapper("JVM_InitStackTraceElementArray");
591 Handle exception(THREAD, JNIHandles::resolve(throwable));
592 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
593 objArrayHandle stack_trace(THREAD, st);
594 // Fill in the allocated stack trace
595 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
596 JVM_END
597
598
599 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
600 JVMWrapper("JVM_InitStackTraceElement");
601 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
602 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
603 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
604 JVM_END
605
606
607 // java.lang.StackWalker //////////////////////////////////////////////////////
608
609
610 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
611 jint skip_frames, jint frame_count, jint start_index,
612 jobjectArray frames))
613 JVMWrapper("JVM_CallStackWalk");
614 JavaThread* jt = (JavaThread*) THREAD;
615 if (!jt->is_Java_thread() || !jt->has_last_Java_frame()) {
616 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
617 }
618
619 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
620
621 // frames array is a Class<?>[] array when only getting caller reference,
622 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
623 // be null.
624 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
625 objArrayHandle frames_array_h(THREAD, fa);
626
627 int limit = start_index + frame_count;
628 if (frames_array_h->length() < limit) {
629 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
630 }
631
632 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
633 start_index, frames_array_h, CHECK_NULL);
634 return JNIHandles::make_local(THREAD, result);
635 JVM_END
636
637
638 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
639 jint frame_count, jint start_index,
640 jobjectArray frames))
641 JVMWrapper("JVM_MoreStackWalk");
642
643 // frames array is a Class<?>[] array when only getting caller reference,
644 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
645 // be null.
646 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
647 objArrayHandle frames_array_h(THREAD, fa);
648
649 int limit = start_index+frame_count;
650 if (frames_array_h->length() < limit) {
651 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
652 }
653
654 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
655 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
656 start_index, frames_array_h, THREAD);
657 JVM_END
658
659 // java.lang.Object ///////////////////////////////////////////////
660
661
662 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
663 JVMWrapper("JVM_IHashCode");
664 // as implemented in the classic virtual machine; return 0 if object is NULL
665 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
666 JVM_END
667
668
669 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
670 JVMWrapper("JVM_MonitorWait");
671 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
672 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
673 if (JvmtiExport::should_post_monitor_wait()) {
674 JvmtiExport::post_monitor_wait((JavaThread *)THREAD, (oop)obj(), ms);
675
676 // The current thread already owns the monitor and it has not yet
677 // been added to the wait queue so the current thread cannot be
678 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
679 // event handler cannot accidentally consume an unpark() meant for
680 // the ParkEvent associated with this ObjectMonitor.
681 }
682 ObjectSynchronizer::wait(obj, ms, CHECK);
683 JVM_END
684
685
686 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
687 JVMWrapper("JVM_MonitorNotify");
688 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
689 ObjectSynchronizer::notify(obj, CHECK);
690 JVM_END
691
692
693 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
694 JVMWrapper("JVM_MonitorNotifyAll");
695 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
696 ObjectSynchronizer::notifyall(obj, CHECK);
697 JVM_END
698
699
700 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
701 JVMWrapper("JVM_Clone");
702 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
703 Klass* klass = obj->klass();
704 JvmtiVMObjectAllocEventCollector oam;
705
706 #ifdef ASSERT
707 // Just checking that the cloneable flag is set correct
708 if (obj->is_array()) {
709 guarantee(klass->is_cloneable(), "all arrays are cloneable");
710 } else {
711 guarantee(obj->is_instance(), "should be instanceOop");
712 bool cloneable = klass->is_subtype_of(SystemDictionary::Cloneable_klass());
713 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
714 }
715 #endif
716
717 // Check if class of obj supports the Cloneable interface.
718 // All arrays are considered to be cloneable (See JLS 20.1.5).
719 // All j.l.r.Reference classes are considered non-cloneable.
720 if (!klass->is_cloneable() ||
721 (klass->is_instance_klass() &&
722 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
723 ResourceMark rm(THREAD);
724 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
725 }
726
727 // Make shallow object copy
728 const int size = obj->size();
729 oop new_obj_oop = NULL;
730 if (obj->is_array()) {
731 const int length = ((arrayOop)obj())->length();
732 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
733 /* do_zero */ true, CHECK_NULL);
734 } else {
735 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
736 }
737
738 HeapAccess<>::clone(obj(), new_obj_oop, size);
739
740 Handle new_obj(THREAD, new_obj_oop);
741 // Caution: this involves a java upcall, so the clone should be
742 // "gc-robust" by this stage.
743 if (klass->has_finalizer()) {
744 assert(obj->is_instance(), "should be instanceOop");
745 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
746 new_obj = Handle(THREAD, new_obj_oop);
747 }
748
749 return JNIHandles::make_local(THREAD, new_obj());
750 JVM_END
751
752 // java.io.File ///////////////////////////////////////////////////////////////
753
754 JVM_LEAF(char*, JVM_NativePath(char* path))
755 JVMWrapper("JVM_NativePath");
756 return os::native_path(path);
757 JVM_END
758
759
760 // Misc. class handling ///////////////////////////////////////////////////////////
761
762
763 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
764 JVMWrapper("JVM_GetCallerClass");
765
766 // Getting the class of the caller frame.
767 //
768 // The call stack at this point looks something like this:
769 //
770 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
771 // [1] [ @CallerSensitive API.method ]
772 // [.] [ (skipped intermediate frames) ]
773 // [n] [ caller ]
774 vframeStream vfst(thread);
775 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
776 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
777 Method* m = vfst.method();
778 assert(m != NULL, "sanity");
779 switch (n) {
780 case 0:
781 // This must only be called from Reflection.getCallerClass
782 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
783 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
784 }
785 // fall-through
786 case 1:
787 // Frame 0 and 1 must be caller sensitive.
788 if (!m->caller_sensitive()) {
789 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
790 }
791 break;
792 default:
793 if (!m->is_ignored_by_security_stack_walk()) {
794 // We have reached the desired frame; return the holder class.
795 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
796 }
797 break;
798 }
799 }
800 return NULL;
801 JVM_END
802
803
804 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
805 JVMWrapper("JVM_FindPrimitiveClass");
806 oop mirror = NULL;
807 BasicType t = name2type(utf);
808 if (t != T_ILLEGAL && !is_reference_type(t)) {
809 mirror = Universe::java_mirror(t);
810 }
811 if (mirror == NULL) {
812 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
813 } else {
814 return (jclass) JNIHandles::make_local(THREAD, mirror);
815 }
816 JVM_END
817
818
819 // Returns a class loaded by the bootstrap class loader; or null
820 // if not found. ClassNotFoundException is not thrown.
821 // FindClassFromBootLoader is exported to the launcher for windows.
822 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
823 const char* name))
824 JVMWrapper("JVM_FindClassFromBootLoader");
825
826 // Java libraries should ensure that name is never null or illegal.
827 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
828 // It's impossible to create this class; the name cannot fit
829 // into the constant pool.
830 return NULL;
831 }
832 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
833
834 TempNewSymbol h_name = SymbolTable::new_symbol(name);
835 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
836 if (k == NULL) {
837 return NULL;
838 }
839
840 if (log_is_enabled(Debug, class, resolve)) {
841 trace_class_resolution(k);
842 }
843 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
844 JVM_END
845
846 // Find a class with this name in this loader, using the caller's protection domain.
847 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
848 jboolean init, jobject loader,
849 jclass caller))
850 JVMWrapper("JVM_FindClassFromCaller throws ClassNotFoundException");
851
852 TempNewSymbol h_name =
853 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
854 CHECK_NULL);
855
856 oop loader_oop = JNIHandles::resolve(loader);
857 oop from_class = JNIHandles::resolve(caller);
858 oop protection_domain = NULL;
859 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
860 // NPE. Put it in another way, the bootstrap class loader has all permission and
861 // thus no checkPackageAccess equivalence in the VM class loader.
862 // The caller is also passed as NULL by the java code if there is no security
863 // manager to avoid the performance cost of getting the calling class.
864 if (from_class != NULL && loader_oop != NULL) {
865 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
866 }
867
868 Handle h_loader(THREAD, loader_oop);
869 Handle h_prot(THREAD, protection_domain);
870 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
871 h_prot, false, THREAD);
872
873 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
874 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
875 }
876 return result;
877 JVM_END
878
879 // Currently only called from the old verifier.
880 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
881 jboolean init, jclass from))
882 JVMWrapper("JVM_FindClassFromClass");
883 TempNewSymbol h_name =
884 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
885 CHECK_NULL);
886 oop from_class_oop = JNIHandles::resolve(from);
887 Klass* from_class = (from_class_oop == NULL)
888 ? (Klass*)NULL
889 : java_lang_Class::as_Klass(from_class_oop);
890 oop class_loader = NULL;
891 oop protection_domain = NULL;
892 if (from_class != NULL) {
893 class_loader = from_class->class_loader();
894 protection_domain = from_class->protection_domain();
895 }
896 Handle h_loader(THREAD, class_loader);
897 Handle h_prot (THREAD, protection_domain);
898 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
899 h_prot, true, thread);
900
901 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
902 // this function is generally only used for class loading during verification.
903 ResourceMark rm;
904 oop from_mirror = JNIHandles::resolve_non_null(from);
905 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
906 const char * from_name = from_class->external_name();
907
908 oop mirror = JNIHandles::resolve_non_null(result);
909 Klass* to_class = java_lang_Class::as_Klass(mirror);
910 const char * to = to_class->external_name();
911 log_debug(class, resolve)("%s %s (verification)", from_name, to);
912 }
913
914 return result;
915 JVM_END
916
917 static void is_lock_held_by_thread(Handle loader, PerfCounter* counter, TRAPS) {
918 if (loader.is_null()) {
919 return;
920 }
921
922 // check whether the current caller thread holds the lock or not.
923 // If not, increment the corresponding counter
924 if (ObjectSynchronizer::query_lock_ownership((JavaThread*)THREAD, loader) !=
925 ObjectSynchronizer::owner_self) {
926 counter->inc();
927 }
928 }
929
930 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
931 static jclass jvm_define_class_common(const char *name,
932 jobject loader, const jbyte *buf,
933 jsize len, jobject pd, const char *source,
934 TRAPS) {
935 if (source == NULL) source = "__JVM_DefineClass__";
936
937 assert(THREAD->is_Java_thread(), "must be a JavaThread");
938 JavaThread* jt = (JavaThread*) THREAD;
939
940 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
941 ClassLoader::perf_define_appclass_selftime(),
942 ClassLoader::perf_define_appclasses(),
943 jt->get_thread_stat()->perf_recursion_counts_addr(),
944 jt->get_thread_stat()->perf_timers_addr(),
945 PerfClassTraceTime::DEFINE_CLASS);
946
947 if (UsePerfData) {
948 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
949 }
950
951 // Class resolution will get the class name from the .class stream if the name is null.
952 TempNewSymbol class_name = name == NULL ? NULL :
953 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
954 CHECK_NULL);
955
956 ResourceMark rm(THREAD);
957 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
958 Handle class_loader (THREAD, JNIHandles::resolve(loader));
959 if (UsePerfData) {
960 is_lock_held_by_thread(class_loader,
961 ClassLoader::sync_JVMDefineClassLockFreeCounter(),
962 THREAD);
963 }
964 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
965 Klass* k = SystemDictionary::resolve_from_stream(class_name,
966 class_loader,
967 protection_domain,
968 &st,
969 CHECK_NULL);
970
971 if (log_is_enabled(Debug, class, resolve) && k != NULL) {
972 trace_class_resolution(k);
973 }
974
975 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
976 }
977
978 enum {
979 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
980 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
981 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
982 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
983 };
984
985 /*
986 * Define a class with the specified flags that indicates if it's a nestmate,
987 * hidden, or strongly referenced from class loader.
988 */
989 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
990 const jbyte *buf, jsize len, jobject pd,
991 jboolean init, int flags, jobject classData, TRAPS) {
992 assert(THREAD->is_Java_thread(), "must be a JavaThread");
993 ResourceMark rm(THREAD);
994
995 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
996 // Lookup class must be a non-null instance
997 if (lookup_k == NULL) {
998 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
999 }
1000 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
1001
1002 Handle class_loader (THREAD, lookup_k->class_loader());
1003
1004 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1005 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1006 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1007 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1008
1009 InstanceKlass* host_class = NULL;
1010 if (is_nestmate) {
1011 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1012 }
1013
1014 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1015 name,
1016 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1017 is_nestmate ? host_class->external_name() : "",
1018 is_hidden ? "hidden" : "not hidden",
1019 is_strong ? "strong" : "weak",
1020 vm_annotations ? "with vm annotations" : "without vm annotation");
1021
1022 if (!is_hidden) {
1023 // classData is only applicable for hidden classes
1024 if (classData != NULL) {
1025 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1026 }
1027 if (is_nestmate) {
1028 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1029 }
1030 if (!is_strong) {
1031 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1032 }
1033 if (vm_annotations) {
1034 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1035 }
1036 if (flags != STRONG_LOADER_LINK) {
1037 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1038 err_msg("invalid flag 0x%x", flags));
1039 }
1040 }
1041
1042 // Class resolution will get the class name from the .class stream if the name is null.
1043 TempNewSymbol class_name = name == NULL ? NULL :
1044 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1045 CHECK_NULL);
1046
1047 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1048 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1049 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1050
1051 Klass* defined_k;
1052 InstanceKlass* ik = NULL;
1053 if (!is_hidden) {
1054 defined_k = SystemDictionary::resolve_from_stream(class_name,
1055 class_loader,
1056 protection_domain,
1057 &st,
1058 CHECK_NULL);
1059
1060 if (log_is_enabled(Debug, class, resolve) && defined_k != NULL) {
1061 trace_class_resolution(defined_k);
1062 }
1063 ik = InstanceKlass::cast(defined_k);
1064 } else { // hidden
1065 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1066 ClassLoadInfo cl_info(protection_domain,
1067 NULL, // unsafe_anonymous_host
1068 NULL, // cp_patches
1069 host_class,
1070 classData_h,
1071 is_hidden,
1072 is_strong,
1073 vm_annotations);
1074 defined_k = SystemDictionary::parse_stream(class_name,
1075 class_loader,
1076 &st,
1077 cl_info,
1078 CHECK_NULL);
1079 if (defined_k == NULL) {
1080 THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a hidden class");
1081 }
1082
1083 ik = InstanceKlass::cast(defined_k);
1084
1085 // The hidden class loader data has been artificially been kept alive to
1086 // this point. The mirror and any instances of this class have to keep
1087 // it alive afterwards.
1088 ik->class_loader_data()->dec_keep_alive();
1089
1090 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1091 ModuleEntry* module = ik->module();
1092 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1093 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1094 module_name,
1095 ik->external_name(),
1096 host_class->external_name(),
1097 ik->is_hidden() ? "is hidden" : "is not hidden");
1098 }
1099 }
1100 assert(Reflection::is_same_class_package(lookup_k, defined_k),
1101 "lookup class and defined class are in different packages");
1102
1103 if (init) {
1104 ik->initialize(CHECK_NULL);
1105 } else {
1106 ik->link_class(CHECK_NULL);
1107 }
1108
1109 return (jclass) JNIHandles::make_local(THREAD, defined_k->java_mirror());
1110 }
1111
1112 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1113 JVMWrapper("JVM_DefineClass");
1114
1115 return jvm_define_class_common(name, loader, buf, len, pd, NULL, THREAD);
1116 JVM_END
1117
1118 /*
1119 * Define a class with the specified lookup class.
1120 * lookup: Lookup class
1121 * name: the name of the class
1122 * buf: class bytes
1123 * len: length of class bytes
1124 * pd: protection domain
1125 * init: initialize the class
1126 * flags: properties of the class
1127 * classData: private static pre-initialized field
1128 */
1129 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1130 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1131 JVMWrapper("JVM_LookupDefineClass");
1132
1133 if (lookup == NULL) {
1134 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1135 }
1136
1137 assert(buf != NULL, "buf must not be NULL");
1138
1139 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1140 JVM_END
1141
1142 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1143 JVMWrapper("JVM_DefineClassWithSource");
1144
1145 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1146 JVM_END
1147
1148 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1149 JVMWrapper("JVM_FindLoadedClass");
1150 ResourceMark rm(THREAD);
1151
1152 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1153 char* str = java_lang_String::as_utf8_string(h_name());
1154
1155 // Sanity check, don't expect null
1156 if (str == NULL) return NULL;
1157
1158 // Internalize the string, converting '.' to '/' in string.
1159 char* p = (char*)str;
1160 while (*p != '\0') {
1161 if (*p == '.') {
1162 *p = '/';
1163 }
1164 p++;
1165 }
1166
1167 const int str_len = (int)(p - str);
1168 if (str_len > Symbol::max_length()) {
1169 // It's impossible to create this class; the name cannot fit
1170 // into the constant pool.
1171 return NULL;
1172 }
1173 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1174
1175 // Security Note:
1176 // The Java level wrapper will perform the necessary security check allowing
1177 // us to pass the NULL as the initiating class loader.
1178 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1179 if (UsePerfData) {
1180 is_lock_held_by_thread(h_loader,
1181 ClassLoader::sync_JVMFindLoadedClassLockFreeCounter(),
1182 THREAD);
1183 }
1184
1185 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1186 h_loader,
1187 Handle(),
1188 CHECK_NULL);
1189 #if INCLUDE_CDS
1190 if (k == NULL) {
1191 // If the class is not already loaded, try to see if it's in the shared
1192 // archive for the current classloader (h_loader).
1193 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1194 }
1195 #endif
1196 return (k == NULL) ? NULL :
1197 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1198 JVM_END
1199
1200 // Module support //////////////////////////////////////////////////////////////////////////////
1201
1202 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1203 jstring location, jobjectArray packages))
1204 JVMWrapper("JVM_DefineModule");
1205 Modules::define_module(module, is_open, version, location, packages, CHECK);
1206 JVM_END
1207
1208 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1209 JVMWrapper("JVM_SetBootLoaderUnnamedModule");
1210 Modules::set_bootloader_unnamed_module(module, CHECK);
1211 JVM_END
1212
1213 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1214 JVMWrapper("JVM_AddModuleExports");
1215 Modules::add_module_exports_qualified(from_module, package, to_module, CHECK);
1216 JVM_END
1217
1218 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1219 JVMWrapper("JVM_AddModuleExportsToAllUnnamed");
1220 Modules::add_module_exports_to_all_unnamed(from_module, package, CHECK);
1221 JVM_END
1222
1223 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1224 JVMWrapper("JVM_AddModuleExportsToAll");
1225 Modules::add_module_exports(from_module, package, NULL, CHECK);
1226 JVM_END
1227
1228 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1229 JVMWrapper("JVM_AddReadsModule");
1230 Modules::add_reads_module(from_module, source_module, CHECK);
1231 JVM_END
1232
1233 // Reflection support //////////////////////////////////////////////////////////////////////////////
1234
1235 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1236 assert (cls != NULL, "illegal class");
1237 JVMWrapper("JVM_InitClassName");
1238 JvmtiVMObjectAllocEventCollector oam;
1239 ResourceMark rm(THREAD);
1240 HandleMark hm(THREAD);
1241 Handle java_class(THREAD, JNIHandles::resolve(cls));
1242 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1243 return (jstring) JNIHandles::make_local(THREAD, result);
1244 JVM_END
1245
1246
1247 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1248 JVMWrapper("JVM_GetClassInterfaces");
1249 JvmtiVMObjectAllocEventCollector oam;
1250 oop mirror = JNIHandles::resolve_non_null(cls);
1251
1252 // Special handling for primitive objects
1253 if (java_lang_Class::is_primitive(mirror)) {
1254 // Primitive objects does not have any interfaces
1255 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1256 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1257 }
1258
1259 Klass* klass = java_lang_Class::as_Klass(mirror);
1260 // Figure size of result array
1261 int size;
1262 if (klass->is_instance_klass()) {
1263 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1264 } else {
1265 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1266 size = 2;
1267 }
1268
1269 // Allocate result array
1270 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), size, CHECK_NULL);
1271 objArrayHandle result (THREAD, r);
1272 // Fill in result
1273 if (klass->is_instance_klass()) {
1274 // Regular instance klass, fill in all local interfaces
1275 for (int index = 0; index < size; index++) {
1276 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1277 result->obj_at_put(index, k->java_mirror());
1278 }
1279 } else {
1280 // All arrays implement java.lang.Cloneable and java.io.Serializable
1281 result->obj_at_put(0, SystemDictionary::Cloneable_klass()->java_mirror());
1282 result->obj_at_put(1, SystemDictionary::Serializable_klass()->java_mirror());
1283 }
1284 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1285 JVM_END
1286
1287
1288 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1289 JVMWrapper("JVM_IsInterface");
1290 oop mirror = JNIHandles::resolve_non_null(cls);
1291 if (java_lang_Class::is_primitive(mirror)) {
1292 return JNI_FALSE;
1293 }
1294 Klass* k = java_lang_Class::as_Klass(mirror);
1295 jboolean result = k->is_interface();
1296 assert(!result || k->is_instance_klass(),
1297 "all interfaces are instance types");
1298 // The compiler intrinsic for isInterface tests the
1299 // Klass::_access_flags bits in the same way.
1300 return result;
1301 JVM_END
1302
1303 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1304 JVMWrapper("JVM_IsHiddenClass");
1305 oop mirror = JNIHandles::resolve_non_null(cls);
1306 if (java_lang_Class::is_primitive(mirror)) {
1307 return JNI_FALSE;
1308 }
1309 Klass* k = java_lang_Class::as_Klass(mirror);
1310 return k->is_hidden();
1311 JVM_END
1312
1313 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1314 JVMWrapper("JVM_GetClassSigners");
1315 JvmtiVMObjectAllocEventCollector oam;
1316 oop mirror = JNIHandles::resolve_non_null(cls);
1317 if (java_lang_Class::is_primitive(mirror)) {
1318 // There are no signers for primitive types
1319 return NULL;
1320 }
1321
1322 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1323
1324 // If there are no signers set in the class, or if the class
1325 // is an array, return NULL.
1326 if (signers == NULL) return NULL;
1327
1328 // copy of the signers array
1329 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1330 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1331 for (int index = 0; index < signers->length(); index++) {
1332 signers_copy->obj_at_put(index, signers->obj_at(index));
1333 }
1334
1335 // return the copy
1336 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1337 JVM_END
1338
1339
1340 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1341 JVMWrapper("JVM_SetClassSigners");
1342 oop mirror = JNIHandles::resolve_non_null(cls);
1343 if (!java_lang_Class::is_primitive(mirror)) {
1344 // This call is ignored for primitive types and arrays.
1345 // Signers are only set once, ClassLoader.java, and thus shouldn't
1346 // be called with an array. Only the bootstrap loader creates arrays.
1347 Klass* k = java_lang_Class::as_Klass(mirror);
1348 if (k->is_instance_klass()) {
1349 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1350 }
1351 }
1352 JVM_END
1353
1354
1355 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1356 JVMWrapper("JVM_GetProtectionDomain");
1357 oop mirror = JNIHandles::resolve_non_null(cls);
1358 if (mirror == NULL) {
1359 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1360 }
1361
1362 if (java_lang_Class::is_primitive(mirror)) {
1363 // Primitive types does not have a protection domain.
1364 return NULL;
1365 }
1366
1367 oop pd = java_lang_Class::protection_domain(mirror);
1368 return (jobject) JNIHandles::make_local(THREAD, pd);
1369 JVM_END
1370
1371
1372 // Returns the inherited_access_control_context field of the running thread.
1373 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1374 JVMWrapper("JVM_GetInheritedAccessControlContext");
1375 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1376 return JNIHandles::make_local(THREAD, result);
1377 JVM_END
1378
1379 class RegisterArrayForGC {
1380 private:
1381 JavaThread *_thread;
1382 public:
1383 RegisterArrayForGC(JavaThread *thread, GrowableArray<oop>* array) {
1384 _thread = thread;
1385 _thread->register_array_for_gc(array);
1386 }
1387
1388 ~RegisterArrayForGC() {
1389 _thread->register_array_for_gc(NULL);
1390 }
1391 };
1392
1393
1394 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1395 JVMWrapper("JVM_GetStackAccessControlContext");
1396 if (!UsePrivilegedStack) return NULL;
1397
1398 ResourceMark rm(THREAD);
1399 GrowableArray<oop>* local_array = new GrowableArray<oop>(12);
1400 JvmtiVMObjectAllocEventCollector oam;
1401
1402 // count the protection domains on the execution stack. We collapse
1403 // duplicate consecutive protection domains into a single one, as
1404 // well as stopping when we hit a privileged frame.
1405
1406 oop previous_protection_domain = NULL;
1407 Handle privileged_context(thread, NULL);
1408 bool is_privileged = false;
1409 oop protection_domain = NULL;
1410
1411 // Iterate through Java frames
1412 vframeStream vfst(thread);
1413 for(; !vfst.at_end(); vfst.next()) {
1414 // get method of frame
1415 Method* method = vfst.method();
1416
1417 // stop at the first privileged frame
1418 if (method->method_holder() == SystemDictionary::AccessController_klass() &&
1419 method->name() == vmSymbols::executePrivileged_name())
1420 {
1421 // this frame is privileged
1422 is_privileged = true;
1423
1424 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1425
1426 StackValueCollection* locals = priv->locals();
1427 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1428 StackValue* clr_sv = locals->at(2); // Class<?> caller
1429 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1430 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1431 privileged_context = ctx_sv->get_obj();
1432 Handle caller = clr_sv->get_obj();
1433
1434 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1435 protection_domain = caller_klass->protection_domain();
1436 } else {
1437 protection_domain = method->method_holder()->protection_domain();
1438 }
1439
1440 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1441 local_array->push(protection_domain);
1442 previous_protection_domain = protection_domain;
1443 }
1444
1445 if (is_privileged) break;
1446 }
1447
1448
1449 // either all the domains on the stack were system domains, or
1450 // we had a privileged system domain
1451 if (local_array->is_empty()) {
1452 if (is_privileged && privileged_context.is_null()) return NULL;
1453
1454 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1455 return JNIHandles::make_local(THREAD, result);
1456 }
1457
1458 // the resource area must be registered in case of a gc
1459 RegisterArrayForGC ragc(thread, local_array);
1460 objArrayOop context = oopFactory::new_objArray(SystemDictionary::ProtectionDomain_klass(),
1461 local_array->length(), CHECK_NULL);
1462 objArrayHandle h_context(thread, context);
1463 for (int index = 0; index < local_array->length(); index++) {
1464 h_context->obj_at_put(index, local_array->at(index));
1465 }
1466
1467 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1468
1469 return JNIHandles::make_local(THREAD, result);
1470 JVM_END
1471
1472
1473 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1474 JVMWrapper("JVM_IsArrayClass");
1475 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1476 return (k != NULL) && k->is_array_klass() ? true : false;
1477 JVM_END
1478
1479
1480 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1481 JVMWrapper("JVM_IsPrimitiveClass");
1482 oop mirror = JNIHandles::resolve_non_null(cls);
1483 return (jboolean) java_lang_Class::is_primitive(mirror);
1484 JVM_END
1485
1486
1487 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1488 JVMWrapper("JVM_GetClassModifiers");
1489 oop mirror = JNIHandles::resolve_non_null(cls);
1490 if (java_lang_Class::is_primitive(mirror)) {
1491 // Primitive type
1492 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1493 }
1494
1495 Klass* k = java_lang_Class::as_Klass(mirror);
1496 debug_only(int computed_modifiers = k->compute_modifier_flags(CHECK_0));
1497 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1498 return k->modifier_flags();
1499 JVM_END
1500
1501
1502 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1503
1504 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1505 JvmtiVMObjectAllocEventCollector oam;
1506 // ofClass is a reference to a java_lang_Class object. The mirror object
1507 // of an InstanceKlass
1508 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1509 if (java_lang_Class::is_primitive(ofMirror) ||
1510 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1511 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1512 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1513 }
1514
1515 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1516 InnerClassesIterator iter(k);
1517
1518 if (iter.length() == 0) {
1519 // Neither an inner nor outer class
1520 oop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_NULL);
1521 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1522 }
1523
1524 // find inner class info
1525 constantPoolHandle cp(thread, k->constants());
1526 int length = iter.length();
1527
1528 // Allocate temp. result array
1529 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(), length/4, CHECK_NULL);
1530 objArrayHandle result (THREAD, r);
1531 int members = 0;
1532
1533 for (; !iter.done(); iter.next()) {
1534 int ioff = iter.inner_class_info_index();
1535 int ooff = iter.outer_class_info_index();
1536
1537 if (ioff != 0 && ooff != 0) {
1538 // Check to see if the name matches the class we're looking for
1539 // before attempting to find the class.
1540 if (cp->klass_name_at_matches(k, ooff)) {
1541 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1542 if (outer_klass == k) {
1543 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1544 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1545
1546 // Throws an exception if outer klass has not declared k as
1547 // an inner klass
1548 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1549
1550 result->obj_at_put(members, inner_klass->java_mirror());
1551 members++;
1552 }
1553 }
1554 }
1555 }
1556
1557 if (members != length) {
1558 // Return array of right length
1559 objArrayOop res = oopFactory::new_objArray(SystemDictionary::Class_klass(), members, CHECK_NULL);
1560 for(int i = 0; i < members; i++) {
1561 res->obj_at_put(i, result->obj_at(i));
1562 }
1563 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1564 }
1565
1566 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1567 JVM_END
1568
1569
1570 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1571 {
1572 // ofClass is a reference to a java_lang_Class object.
1573 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1574 if (java_lang_Class::is_primitive(ofMirror)) {
1575 return NULL;
1576 }
1577 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1578 if (!klass->is_instance_klass()) {
1579 return NULL;
1580 }
1581
1582 bool inner_is_member = false;
1583 Klass* outer_klass
1584 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1585 if (outer_klass == NULL) return NULL; // already a top-level class
1586 if (!inner_is_member) return NULL; // a hidden or unsafe anonymous class (inside a method)
1587 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1588 }
1589 JVM_END
1590
1591 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1592 {
1593 oop mirror = JNIHandles::resolve_non_null(cls);
1594 if (java_lang_Class::is_primitive(mirror)) {
1595 return NULL;
1596 }
1597 Klass* klass = java_lang_Class::as_Klass(mirror);
1598 if (!klass->is_instance_klass()) {
1599 return NULL;
1600 }
1601 InstanceKlass* k = InstanceKlass::cast(klass);
1602 int ooff = 0, noff = 0;
1603 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1604 if (noff != 0) {
1605 constantPoolHandle i_cp(thread, k->constants());
1606 Symbol* name = i_cp->symbol_at(noff);
1607 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1608 return (jstring) JNIHandles::make_local(THREAD, str());
1609 }
1610 }
1611 return NULL;
1612 }
1613 JVM_END
1614
1615 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1616 assert (cls != NULL, "illegal class");
1617 JVMWrapper("JVM_GetClassSignature");
1618 JvmtiVMObjectAllocEventCollector oam;
1619 ResourceMark rm(THREAD);
1620 oop mirror = JNIHandles::resolve_non_null(cls);
1621 // Return null for arrays and primatives
1622 if (!java_lang_Class::is_primitive(mirror)) {
1623 Klass* k = java_lang_Class::as_Klass(mirror);
1624 if (k->is_instance_klass()) {
1625 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1626 if (sym == NULL) return NULL;
1627 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1628 return (jstring) JNIHandles::make_local(THREAD, str());
1629 }
1630 }
1631 return NULL;
1632 JVM_END
1633
1634
1635 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1636 assert (cls != NULL, "illegal class");
1637 JVMWrapper("JVM_GetClassAnnotations");
1638 oop mirror = JNIHandles::resolve_non_null(cls);
1639 // Return null for arrays and primitives
1640 if (!java_lang_Class::is_primitive(mirror)) {
1641 Klass* k = java_lang_Class::as_Klass(mirror);
1642 if (k->is_instance_klass()) {
1643 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1644 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1645 }
1646 }
1647 return NULL;
1648 JVM_END
1649
1650
1651 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd, TRAPS) {
1652 // some of this code was adapted from from jni_FromReflectedField
1653
1654 oop reflected = JNIHandles::resolve_non_null(field);
1655 oop mirror = java_lang_reflect_Field::clazz(reflected);
1656 Klass* k = java_lang_Class::as_Klass(mirror);
1657 int slot = java_lang_reflect_Field::slot(reflected);
1658 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1659
1660 InstanceKlass* ik = InstanceKlass::cast(k);
1661 intptr_t offset = ik->field_offset(slot);
1662
1663 if (modifiers & JVM_ACC_STATIC) {
1664 // for static fields we only look in the current class
1665 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1666 assert(false, "cannot find static field");
1667 return false;
1668 }
1669 } else {
1670 // for instance fields we start with the current class and work
1671 // our way up through the superclass chain
1672 if (!ik->find_field_from_offset(offset, false, &fd)) {
1673 assert(false, "cannot find instance field");
1674 return false;
1675 }
1676 }
1677 return true;
1678 }
1679
1680 static Method* jvm_get_method_common(jobject method) {
1681 // some of this code was adapted from from jni_FromReflectedMethod
1682
1683 oop reflected = JNIHandles::resolve_non_null(method);
1684 oop mirror = NULL;
1685 int slot = 0;
1686
1687 if (reflected->klass() == SystemDictionary::reflect_Constructor_klass()) {
1688 mirror = java_lang_reflect_Constructor::clazz(reflected);
1689 slot = java_lang_reflect_Constructor::slot(reflected);
1690 } else {
1691 assert(reflected->klass() == SystemDictionary::reflect_Method_klass(),
1692 "wrong type");
1693 mirror = java_lang_reflect_Method::clazz(reflected);
1694 slot = java_lang_reflect_Method::slot(reflected);
1695 }
1696 Klass* k = java_lang_Class::as_Klass(mirror);
1697
1698 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1699 assert(m != NULL, "cannot find method");
1700 return m; // caller has to deal with NULL in product mode
1701 }
1702
1703 /* Type use annotations support (JDK 1.8) */
1704
1705 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1706 assert (cls != NULL, "illegal class");
1707 JVMWrapper("JVM_GetClassTypeAnnotations");
1708 ResourceMark rm(THREAD);
1709 // Return null for arrays and primitives
1710 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1711 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1712 if (k->is_instance_klass()) {
1713 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1714 if (type_annotations != NULL) {
1715 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1716 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1717 }
1718 }
1719 }
1720 return NULL;
1721 JVM_END
1722
1723 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1724 assert (method != NULL, "illegal method");
1725 JVMWrapper("JVM_GetMethodTypeAnnotations");
1726
1727 // method is a handle to a java.lang.reflect.Method object
1728 Method* m = jvm_get_method_common(method);
1729 if (m == NULL) {
1730 return NULL;
1731 }
1732
1733 AnnotationArray* type_annotations = m->type_annotations();
1734 if (type_annotations != NULL) {
1735 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1736 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1737 }
1738
1739 return NULL;
1740 JVM_END
1741
1742 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1743 assert (field != NULL, "illegal field");
1744 JVMWrapper("JVM_GetFieldTypeAnnotations");
1745
1746 fieldDescriptor fd;
1747 bool gotFd = jvm_get_field_common(field, fd, CHECK_NULL);
1748 if (!gotFd) {
1749 return NULL;
1750 }
1751
1752 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1753 JVM_END
1754
1755 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1756 if (!cp->is_within_bounds(index)) {
1757 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1758 }
1759 }
1760
1761 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1762 {
1763 JVMWrapper("JVM_GetMethodParameters");
1764 // method is a handle to a java.lang.reflect.Method object
1765 Method* method_ptr = jvm_get_method_common(method);
1766 methodHandle mh (THREAD, method_ptr);
1767 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1768 const int num_params = mh->method_parameters_length();
1769
1770 if (num_params < 0) {
1771 // A -1 return value from method_parameters_length means there is no
1772 // parameter data. Return null to indicate this to the reflection
1773 // API.
1774 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1775 return (jobjectArray)NULL;
1776 } else {
1777 // Otherwise, we return something up to reflection, even if it is
1778 // a zero-length array. Why? Because in some cases this can
1779 // trigger a MalformedParametersException.
1780
1781 // make sure all the symbols are properly formatted
1782 for (int i = 0; i < num_params; i++) {
1783 MethodParametersElement* params = mh->method_parameters_start();
1784 int index = params[i].name_cp_index;
1785 constantPoolHandle cp(THREAD, mh->constants());
1786 bounds_check(cp, index, CHECK_NULL);
1787
1788 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1789 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1790 "Wrong type at constant pool index");
1791 }
1792
1793 }
1794
1795 objArrayOop result_oop = oopFactory::new_objArray(SystemDictionary::reflect_Parameter_klass(), num_params, CHECK_NULL);
1796 objArrayHandle result (THREAD, result_oop);
1797
1798 for (int i = 0; i < num_params; i++) {
1799 MethodParametersElement* params = mh->method_parameters_start();
1800 // For a 0 index, give a NULL symbol
1801 Symbol* sym = 0 != params[i].name_cp_index ?
1802 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1803 int flags = params[i].flags;
1804 oop param = Reflection::new_parameter(reflected_method, i, sym,
1805 flags, CHECK_NULL);
1806 result->obj_at_put(i, param);
1807 }
1808 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1809 }
1810 }
1811 JVM_END
1812
1813 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1814
1815 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1816 {
1817 JVMWrapper("JVM_GetClassDeclaredFields");
1818 JvmtiVMObjectAllocEventCollector oam;
1819
1820 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1821 // Exclude primitive types and array types
1822 if (java_lang_Class::is_primitive(ofMirror) ||
1823 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1824 // Return empty array
1825 oop res = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), 0, CHECK_NULL);
1826 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1827 }
1828
1829 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1830 constantPoolHandle cp(THREAD, k->constants());
1831
1832 // Ensure class is linked
1833 k->link_class(CHECK_NULL);
1834
1835 // Allocate result
1836 int num_fields;
1837
1838 if (publicOnly) {
1839 num_fields = 0;
1840 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1841 if (fs.access_flags().is_public()) ++num_fields;
1842 }
1843 } else {
1844 num_fields = k->java_fields_count();
1845 }
1846
1847 objArrayOop r = oopFactory::new_objArray(SystemDictionary::reflect_Field_klass(), num_fields, CHECK_NULL);
1848 objArrayHandle result (THREAD, r);
1849
1850 int out_idx = 0;
1851 fieldDescriptor fd;
1852 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1853 if (!publicOnly || fs.access_flags().is_public()) {
1854 fd.reinitialize(k, fs.index());
1855 oop field = Reflection::new_field(&fd, CHECK_NULL);
1856 result->obj_at_put(out_idx, field);
1857 ++out_idx;
1858 }
1859 }
1860 assert(out_idx == num_fields, "just checking");
1861 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1862 }
1863 JVM_END
1864
1865 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1866 {
1867 JVMWrapper("JVM_IsRecord");
1868 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1869 if (k != NULL && k->is_instance_klass()) {
1870 InstanceKlass* ik = InstanceKlass::cast(k);
1871 return ik->is_record();
1872 } else {
1873 return false;
1874 }
1875 }
1876 JVM_END
1877
1878 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1879 {
1880 JVMWrapper("JVM_GetRecordComponents");
1881 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1882 assert(c->is_instance_klass(), "must be");
1883 InstanceKlass* ik = InstanceKlass::cast(c);
1884
1885 if (ik->is_record()) {
1886 Array<RecordComponent*>* components = ik->record_components();
1887 assert(components != NULL, "components should not be NULL");
1888 {
1889 JvmtiVMObjectAllocEventCollector oam;
1890 constantPoolHandle cp(THREAD, ik->constants());
1891 int length = components->length();
1892 assert(length >= 0, "unexpected record_components length");
1893 objArrayOop record_components =
1894 oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), length, CHECK_NULL);
1895 objArrayHandle components_h (THREAD, record_components);
1896
1897 for (int x = 0; x < length; x++) {
1898 RecordComponent* component = components->at(x);
1899 assert(component != NULL, "unexpected NULL record component");
1900 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1901 components_h->obj_at_put(x, component_oop);
1902 }
1903 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1904 }
1905 }
1906
1907 // Return empty array if ofClass is not a record.
1908 objArrayOop result = oopFactory::new_objArray(SystemDictionary::RecordComponent_klass(), 0, CHECK_NULL);
1909 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1910 }
1911 JVM_END
1912
1913 static bool select_method(const methodHandle& method, bool want_constructor) {
1914 if (want_constructor) {
1915 return (method->is_initializer() && !method->is_static());
1916 } else {
1917 return (!method->is_initializer() && !method->is_overpass());
1918 }
1919 }
1920
1921 static jobjectArray get_class_declared_methods_helper(
1922 JNIEnv *env,
1923 jclass ofClass, jboolean publicOnly,
1924 bool want_constructor,
1925 Klass* klass, TRAPS) {
1926
1927 JvmtiVMObjectAllocEventCollector oam;
1928
1929 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1930 // Exclude primitive types and array types
1931 if (java_lang_Class::is_primitive(ofMirror)
1932 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1933 // Return empty array
1934 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1935 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1936 }
1937
1938 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1939
1940 // Ensure class is linked
1941 k->link_class(CHECK_NULL);
1942
1943 Array<Method*>* methods = k->methods();
1944 int methods_length = methods->length();
1945
1946 // Save original method_idnum in case of redefinition, which can change
1947 // the idnum of obsolete methods. The new method will have the same idnum
1948 // but if we refresh the methods array, the counts will be wrong.
1949 ResourceMark rm(THREAD);
1950 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1951 int num_methods = 0;
1952
1953 for (int i = 0; i < methods_length; i++) {
1954 methodHandle method(THREAD, methods->at(i));
1955 if (select_method(method, want_constructor)) {
1956 if (!publicOnly || method->is_public()) {
1957 idnums->push(method->method_idnum());
1958 ++num_methods;
1959 }
1960 }
1961 }
1962
1963 // Allocate result
1964 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1965 objArrayHandle result (THREAD, r);
1966
1967 // Now just put the methods that we selected above, but go by their idnum
1968 // in case of redefinition. The methods can be redefined at any safepoint,
1969 // so above when allocating the oop array and below when creating reflect
1970 // objects.
1971 for (int i = 0; i < num_methods; i++) {
1972 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1973 if (method.is_null()) {
1974 // Method may have been deleted and seems this API can handle null
1975 // Otherwise should probably put a method that throws NSME
1976 result->obj_at_put(i, NULL);
1977 } else {
1978 oop m;
1979 if (want_constructor) {
1980 m = Reflection::new_constructor(method, CHECK_NULL);
1981 } else {
1982 m = Reflection::new_method(method, false, CHECK_NULL);
1983 }
1984 result->obj_at_put(i, m);
1985 }
1986 }
1987
1988 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1989 }
1990
1991 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1992 {
1993 JVMWrapper("JVM_GetClassDeclaredMethods");
1994 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1995 /*want_constructor*/ false,
1996 SystemDictionary::reflect_Method_klass(), THREAD);
1997 }
1998 JVM_END
1999
2000 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
2001 {
2002 JVMWrapper("JVM_GetClassDeclaredConstructors");
2003 return get_class_declared_methods_helper(env, ofClass, publicOnly,
2004 /*want_constructor*/ true,
2005 SystemDictionary::reflect_Constructor_klass(), THREAD);
2006 }
2007 JVM_END
2008
2009 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
2010 {
2011 JVMWrapper("JVM_GetClassAccessFlags");
2012 oop mirror = JNIHandles::resolve_non_null(cls);
2013 if (java_lang_Class::is_primitive(mirror)) {
2014 // Primitive type
2015 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
2016 }
2017
2018 Klass* k = java_lang_Class::as_Klass(mirror);
2019 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
2020 }
2021 JVM_END
2022
2023 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
2024 {
2025 JVMWrapper("JVM_AreNestMates");
2026 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2027 assert(c->is_instance_klass(), "must be");
2028 InstanceKlass* ck = InstanceKlass::cast(c);
2029 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
2030 assert(m->is_instance_klass(), "must be");
2031 InstanceKlass* mk = InstanceKlass::cast(m);
2032 return ck->has_nestmate_access_to(mk, THREAD);
2033 }
2034 JVM_END
2035
2036 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
2037 {
2038 // current is not a primitive or array class
2039 JVMWrapper("JVM_GetNestHost");
2040 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2041 assert(c->is_instance_klass(), "must be");
2042 InstanceKlass* ck = InstanceKlass::cast(c);
2043 InstanceKlass* host = ck->nest_host(THREAD);
2044 return (jclass) (host == NULL ? NULL :
2045 JNIHandles::make_local(THREAD, host->java_mirror()));
2046 }
2047 JVM_END
2048
2049 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2050 {
2051 // current is not a primitive or array class
2052 JVMWrapper("JVM_GetNestMembers");
2053 ResourceMark rm(THREAD);
2054 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2055 assert(c->is_instance_klass(), "must be");
2056 InstanceKlass* ck = InstanceKlass::cast(c);
2057 InstanceKlass* host = ck->nest_host(THREAD);
2058
2059 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2060 ck->external_name(), host->external_name());
2061 {
2062 JvmtiVMObjectAllocEventCollector oam;
2063 Array<u2>* members = host->nest_members();
2064 int length = members == NULL ? 0 : members->length();
2065
2066 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2067
2068 // nest host is first in the array so make it one bigger
2069 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2070 length + 1, CHECK_NULL);
2071 objArrayHandle result(THREAD, r);
2072 result->obj_at_put(0, host->java_mirror());
2073 if (length != 0) {
2074 int count = 0;
2075 for (int i = 0; i < length; i++) {
2076 int cp_index = members->at(i);
2077 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2078 if (HAS_PENDING_EXCEPTION) {
2079 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) {
2080 return NULL; // propagate VMEs
2081 }
2082 if (log_is_enabled(Trace, class, nestmates)) {
2083 stringStream ss;
2084 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2085 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2086 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2087 log_trace(class, nestmates)("%s", ss.as_string());
2088 }
2089 CLEAR_PENDING_EXCEPTION;
2090 continue;
2091 }
2092 if (k->is_instance_klass()) {
2093 InstanceKlass* ik = InstanceKlass::cast(k);
2094 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2095 if (nest_host_k == host) {
2096 result->obj_at_put(count+1, k->java_mirror());
2097 count++;
2098 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2099 } else {
2100 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2101 ik->external_name(), nest_host_k->external_name());
2102 }
2103 } else {
2104 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2105 k->external_name());
2106 }
2107 }
2108 if (count < length) {
2109 // we had invalid entries so we need to compact the array
2110 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2111 length + 1, count + 1);
2112
2113 objArrayOop r2 = oopFactory::new_objArray(SystemDictionary::Class_klass(),
2114 count + 1, CHECK_NULL);
2115 objArrayHandle result2(THREAD, r2);
2116 for (int i = 0; i < count + 1; i++) {
2117 result2->obj_at_put(i, result->obj_at(i));
2118 }
2119 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2120 }
2121 }
2122 else {
2123 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2124 }
2125 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2126 }
2127 }
2128 JVM_END
2129
2130 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2131 {
2132 JVMWrapper("JVM_GetPermittedSubclasses");
2133 oop mirror = JNIHandles::resolve_non_null(current);
2134 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2135 Klass* c = java_lang_Class::as_Klass(mirror);
2136 assert(c->is_instance_klass(), "must be");
2137 InstanceKlass* ik = InstanceKlass::cast(c);
2138 {
2139 JvmtiVMObjectAllocEventCollector oam;
2140 Array<u2>* subclasses = ik->permitted_subclasses();
2141 int length = subclasses == NULL ? 0 : subclasses->length();
2142 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
2143 length, CHECK_NULL);
2144 objArrayHandle result(THREAD, r);
2145 for (int i = 0; i < length; i++) {
2146 int cp_index = subclasses->at(i);
2147 // This returns <package-name>/<class-name>.
2148 Symbol* klass_name = ik->constants()->klass_name_at(cp_index);
2149 assert(klass_name != NULL, "Unexpected null klass_name");
2150 Handle perm_subtype_h = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2151 result->obj_at_put(i, perm_subtype_h());
2152 }
2153 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2154 }
2155 }
2156 JVM_END
2157
2158 // Constant pool access //////////////////////////////////////////////////////////
2159
2160 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2161 {
2162 JVMWrapper("JVM_GetClassConstantPool");
2163 JvmtiVMObjectAllocEventCollector oam;
2164 oop mirror = JNIHandles::resolve_non_null(cls);
2165 // Return null for primitives and arrays
2166 if (!java_lang_Class::is_primitive(mirror)) {
2167 Klass* k = java_lang_Class::as_Klass(mirror);
2168 if (k->is_instance_klass()) {
2169 InstanceKlass* k_h = InstanceKlass::cast(k);
2170 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2171 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2172 return JNIHandles::make_local(THREAD, jcp());
2173 }
2174 }
2175 return NULL;
2176 }
2177 JVM_END
2178
2179
2180 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2181 {
2182 JVMWrapper("JVM_ConstantPoolGetSize");
2183 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2184 return cp->length();
2185 }
2186 JVM_END
2187
2188
2189 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2190 {
2191 JVMWrapper("JVM_ConstantPoolGetClassAt");
2192 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2193 bounds_check(cp, index, CHECK_NULL);
2194 constantTag tag = cp->tag_at(index);
2195 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2196 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2197 }
2198 Klass* k = cp->klass_at(index, CHECK_NULL);
2199 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2200 }
2201 JVM_END
2202
2203 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2204 {
2205 JVMWrapper("JVM_ConstantPoolGetClassAtIfLoaded");
2206 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2207 bounds_check(cp, index, CHECK_NULL);
2208 constantTag tag = cp->tag_at(index);
2209 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2210 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2211 }
2212 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2213 if (k == NULL) return NULL;
2214 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2215 }
2216 JVM_END
2217
2218 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2219 constantTag tag = cp->tag_at(index);
2220 if (!tag.is_method() && !tag.is_interface_method()) {
2221 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2222 }
2223 int klass_ref = cp->uncached_klass_ref_index_at(index);
2224 Klass* k_o;
2225 if (force_resolution) {
2226 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2227 } else {
2228 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2229 if (k_o == NULL) return NULL;
2230 }
2231 InstanceKlass* k = InstanceKlass::cast(k_o);
2232 Symbol* name = cp->uncached_name_ref_at(index);
2233 Symbol* sig = cp->uncached_signature_ref_at(index);
2234 methodHandle m (THREAD, k->find_method(name, sig));
2235 if (m.is_null()) {
2236 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2237 }
2238 oop method;
2239 if (!m->is_initializer() || m->is_static()) {
2240 method = Reflection::new_method(m, true, CHECK_NULL);
2241 } else {
2242 method = Reflection::new_constructor(m, CHECK_NULL);
2243 }
2244 return JNIHandles::make_local(THREAD, method);
2245 }
2246
2247 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2248 {
2249 JVMWrapper("JVM_ConstantPoolGetMethodAt");
2250 JvmtiVMObjectAllocEventCollector oam;
2251 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2252 bounds_check(cp, index, CHECK_NULL);
2253 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2254 return res;
2255 }
2256 JVM_END
2257
2258 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2259 {
2260 JVMWrapper("JVM_ConstantPoolGetMethodAtIfLoaded");
2261 JvmtiVMObjectAllocEventCollector oam;
2262 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2263 bounds_check(cp, index, CHECK_NULL);
2264 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2265 return res;
2266 }
2267 JVM_END
2268
2269 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2270 constantTag tag = cp->tag_at(index);
2271 if (!tag.is_field()) {
2272 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2273 }
2274 int klass_ref = cp->uncached_klass_ref_index_at(index);
2275 Klass* k_o;
2276 if (force_resolution) {
2277 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2278 } else {
2279 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2280 if (k_o == NULL) return NULL;
2281 }
2282 InstanceKlass* k = InstanceKlass::cast(k_o);
2283 Symbol* name = cp->uncached_name_ref_at(index);
2284 Symbol* sig = cp->uncached_signature_ref_at(index);
2285 fieldDescriptor fd;
2286 Klass* target_klass = k->find_field(name, sig, &fd);
2287 if (target_klass == NULL) {
2288 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2289 }
2290 oop field = Reflection::new_field(&fd, CHECK_NULL);
2291 return JNIHandles::make_local(THREAD, field);
2292 }
2293
2294 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2295 {
2296 JVMWrapper("JVM_ConstantPoolGetFieldAt");
2297 JvmtiVMObjectAllocEventCollector oam;
2298 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2299 bounds_check(cp, index, CHECK_NULL);
2300 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2301 return res;
2302 }
2303 JVM_END
2304
2305 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2306 {
2307 JVMWrapper("JVM_ConstantPoolGetFieldAtIfLoaded");
2308 JvmtiVMObjectAllocEventCollector oam;
2309 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2310 bounds_check(cp, index, CHECK_NULL);
2311 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2312 return res;
2313 }
2314 JVM_END
2315
2316 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2317 {
2318 JVMWrapper("JVM_ConstantPoolGetMemberRefInfoAt");
2319 JvmtiVMObjectAllocEventCollector oam;
2320 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2321 bounds_check(cp, index, CHECK_NULL);
2322 constantTag tag = cp->tag_at(index);
2323 if (!tag.is_field_or_method()) {
2324 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2325 }
2326 int klass_ref = cp->uncached_klass_ref_index_at(index);
2327 Symbol* klass_name = cp->klass_name_at(klass_ref);
2328 Symbol* member_name = cp->uncached_name_ref_at(index);
2329 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2330 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 3, CHECK_NULL);
2331 objArrayHandle dest(THREAD, dest_o);
2332 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2333 dest->obj_at_put(0, str());
2334 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2335 dest->obj_at_put(1, str());
2336 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2337 dest->obj_at_put(2, str());
2338 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2339 }
2340 JVM_END
2341
2342 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2343 {
2344 JVMWrapper("JVM_ConstantPoolGetClassRefIndexAt");
2345 JvmtiVMObjectAllocEventCollector oam;
2346 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2347 bounds_check(cp, index, CHECK_0);
2348 constantTag tag = cp->tag_at(index);
2349 if (!tag.is_field_or_method()) {
2350 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2351 }
2352 return (jint) cp->uncached_klass_ref_index_at(index);
2353 }
2354 JVM_END
2355
2356 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2357 {
2358 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefIndexAt");
2359 JvmtiVMObjectAllocEventCollector oam;
2360 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2361 bounds_check(cp, index, CHECK_0);
2362 constantTag tag = cp->tag_at(index);
2363 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2364 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2365 }
2366 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2367 }
2368 JVM_END
2369
2370 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2371 {
2372 JVMWrapper("JVM_ConstantPoolGetNameAndTypeRefInfoAt");
2373 JvmtiVMObjectAllocEventCollector oam;
2374 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2375 bounds_check(cp, index, CHECK_NULL);
2376 constantTag tag = cp->tag_at(index);
2377 if (!tag.is_name_and_type()) {
2378 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2379 }
2380 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2381 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2382 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::String_klass(), 2, CHECK_NULL);
2383 objArrayHandle dest(THREAD, dest_o);
2384 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2385 dest->obj_at_put(0, str());
2386 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2387 dest->obj_at_put(1, str());
2388 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2389 }
2390 JVM_END
2391
2392 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2393 {
2394 JVMWrapper("JVM_ConstantPoolGetIntAt");
2395 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2396 bounds_check(cp, index, CHECK_0);
2397 constantTag tag = cp->tag_at(index);
2398 if (!tag.is_int()) {
2399 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2400 }
2401 return cp->int_at(index);
2402 }
2403 JVM_END
2404
2405 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2406 {
2407 JVMWrapper("JVM_ConstantPoolGetLongAt");
2408 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2409 bounds_check(cp, index, CHECK_(0L));
2410 constantTag tag = cp->tag_at(index);
2411 if (!tag.is_long()) {
2412 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2413 }
2414 return cp->long_at(index);
2415 }
2416 JVM_END
2417
2418 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2419 {
2420 JVMWrapper("JVM_ConstantPoolGetFloatAt");
2421 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2422 bounds_check(cp, index, CHECK_(0.0f));
2423 constantTag tag = cp->tag_at(index);
2424 if (!tag.is_float()) {
2425 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2426 }
2427 return cp->float_at(index);
2428 }
2429 JVM_END
2430
2431 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2432 {
2433 JVMWrapper("JVM_ConstantPoolGetDoubleAt");
2434 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2435 bounds_check(cp, index, CHECK_(0.0));
2436 constantTag tag = cp->tag_at(index);
2437 if (!tag.is_double()) {
2438 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2439 }
2440 return cp->double_at(index);
2441 }
2442 JVM_END
2443
2444 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2445 {
2446 JVMWrapper("JVM_ConstantPoolGetStringAt");
2447 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2448 bounds_check(cp, index, CHECK_NULL);
2449 constantTag tag = cp->tag_at(index);
2450 if (!tag.is_string()) {
2451 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2452 }
2453 oop str = cp->string_at(index, CHECK_NULL);
2454 return (jstring) JNIHandles::make_local(THREAD, str);
2455 }
2456 JVM_END
2457
2458 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2459 {
2460 JVMWrapper("JVM_ConstantPoolGetUTF8At");
2461 JvmtiVMObjectAllocEventCollector oam;
2462 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2463 bounds_check(cp, index, CHECK_NULL);
2464 constantTag tag = cp->tag_at(index);
2465 if (!tag.is_symbol()) {
2466 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2467 }
2468 Symbol* sym = cp->symbol_at(index);
2469 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2470 return (jstring) JNIHandles::make_local(THREAD, str());
2471 }
2472 JVM_END
2473
2474 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2475 {
2476 JVMWrapper("JVM_ConstantPoolGetTagAt");
2477 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2478 bounds_check(cp, index, CHECK_0);
2479 constantTag tag = cp->tag_at(index);
2480 jbyte result = tag.value();
2481 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2482 // they are changed to the corresponding tags from the JVM spec, so that java code in
2483 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2484 if (tag.is_klass_or_reference()) {
2485 result = JVM_CONSTANT_Class;
2486 } else if (tag.is_string_index()) {
2487 result = JVM_CONSTANT_String;
2488 } else if (tag.is_method_type_in_error()) {
2489 result = JVM_CONSTANT_MethodType;
2490 } else if (tag.is_method_handle_in_error()) {
2491 result = JVM_CONSTANT_MethodHandle;
2492 } else if (tag.is_dynamic_constant_in_error()) {
2493 result = JVM_CONSTANT_Dynamic;
2494 }
2495 return result;
2496 }
2497 JVM_END
2498
2499 // Assertion support. //////////////////////////////////////////////////////////
2500
2501 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2502 JVMWrapper("JVM_DesiredAssertionStatus");
2503 assert(cls != NULL, "bad class");
2504
2505 oop r = JNIHandles::resolve(cls);
2506 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2507 if (java_lang_Class::is_primitive(r)) return false;
2508
2509 Klass* k = java_lang_Class::as_Klass(r);
2510 assert(k->is_instance_klass(), "must be an instance klass");
2511 if (!k->is_instance_klass()) return false;
2512
2513 ResourceMark rm(THREAD);
2514 const char* name = k->name()->as_C_string();
2515 bool system_class = k->class_loader() == NULL;
2516 return JavaAssertions::enabled(name, system_class);
2517
2518 JVM_END
2519
2520
2521 // Return a new AssertionStatusDirectives object with the fields filled in with
2522 // command-line assertion arguments (i.e., -ea, -da).
2523 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2524 JVMWrapper("JVM_AssertionStatusDirectives");
2525 JvmtiVMObjectAllocEventCollector oam;
2526 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2527 return JNIHandles::make_local(THREAD, asd);
2528 JVM_END
2529
2530 // Verification ////////////////////////////////////////////////////////////////////////////////
2531
2532 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2533
2534 // RedefineClasses support: bug 6214132 caused verification to fail.
2535 // All functions from this section should call the jvmtiThreadSate function:
2536 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2537 // The function returns a Klass* of the _scratch_class if the verifier
2538 // was invoked in the middle of the class redefinition.
2539 // Otherwise it returns its argument value which is the _the_class Klass*.
2540 // Please, refer to the description in the jvmtiThreadSate.hpp.
2541
2542 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2543 JVMWrapper("JVM_GetClassNameUTF");
2544 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2545 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2546 return k->name()->as_utf8();
2547 JVM_END
2548
2549
2550 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2551 JVMWrapper("JVM_GetClassCPTypes");
2552 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2553 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2554 // types will have length zero if this is not an InstanceKlass
2555 // (length is determined by call to JVM_GetClassCPEntriesCount)
2556 if (k->is_instance_klass()) {
2557 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2558 for (int index = cp->length() - 1; index >= 0; index--) {
2559 constantTag tag = cp->tag_at(index);
2560 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2561 }
2562 }
2563 JVM_END
2564
2565
2566 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2567 JVMWrapper("JVM_GetClassCPEntriesCount");
2568 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2569 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2570 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2571 JVM_END
2572
2573
2574 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2575 JVMWrapper("JVM_GetClassFieldsCount");
2576 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2577 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2578 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2579 JVM_END
2580
2581
2582 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2583 JVMWrapper("JVM_GetClassMethodsCount");
2584 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2585 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2586 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2587 JVM_END
2588
2589
2590 // The following methods, used for the verifier, are never called with
2591 // array klasses, so a direct cast to InstanceKlass is safe.
2592 // Typically, these methods are called in a loop with bounds determined
2593 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2594 // zero for arrays.
2595 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2596 JVMWrapper("JVM_GetMethodIxExceptionIndexes");
2597 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2598 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2599 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2600 int length = method->checked_exceptions_length();
2601 if (length > 0) {
2602 CheckedExceptionElement* table= method->checked_exceptions_start();
2603 for (int i = 0; i < length; i++) {
2604 exceptions[i] = table[i].class_cp_index;
2605 }
2606 }
2607 JVM_END
2608
2609
2610 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2611 JVMWrapper("JVM_GetMethodIxExceptionsCount");
2612 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2613 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2614 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2615 return method->checked_exceptions_length();
2616 JVM_END
2617
2618
2619 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2620 JVMWrapper("JVM_GetMethodIxByteCode");
2621 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2622 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2623 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2624 memcpy(code, method->code_base(), method->code_size());
2625 JVM_END
2626
2627
2628 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2629 JVMWrapper("JVM_GetMethodIxByteCodeLength");
2630 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2631 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2632 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2633 return method->code_size();
2634 JVM_END
2635
2636
2637 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2638 JVMWrapper("JVM_GetMethodIxExceptionTableEntry");
2639 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2640 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2641 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2642 ExceptionTable extable(method);
2643 entry->start_pc = extable.start_pc(entry_index);
2644 entry->end_pc = extable.end_pc(entry_index);
2645 entry->handler_pc = extable.handler_pc(entry_index);
2646 entry->catchType = extable.catch_type_index(entry_index);
2647 JVM_END
2648
2649
2650 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2651 JVMWrapper("JVM_GetMethodIxExceptionTableLength");
2652 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2653 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2654 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2655 return method->exception_table_length();
2656 JVM_END
2657
2658
2659 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2660 JVMWrapper("JVM_GetMethodIxModifiers");
2661 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2662 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2663 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2664 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2665 JVM_END
2666
2667
2668 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2669 JVMWrapper("JVM_GetFieldIxModifiers");
2670 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2671 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2672 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2673 JVM_END
2674
2675
2676 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2677 JVMWrapper("JVM_GetMethodIxLocalsCount");
2678 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2679 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2680 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2681 return method->max_locals();
2682 JVM_END
2683
2684
2685 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2686 JVMWrapper("JVM_GetMethodIxArgsSize");
2687 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2688 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2689 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2690 return method->size_of_parameters();
2691 JVM_END
2692
2693
2694 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2695 JVMWrapper("JVM_GetMethodIxMaxStack");
2696 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2697 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2698 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2699 return method->verifier_max_stack();
2700 JVM_END
2701
2702
2703 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2704 JVMWrapper("JVM_IsConstructorIx");
2705 ResourceMark rm(THREAD);
2706 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2707 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2708 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2709 return method->name() == vmSymbols::object_initializer_name();
2710 JVM_END
2711
2712
2713 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2714 JVMWrapper("JVM_IsVMGeneratedMethodIx");
2715 ResourceMark rm(THREAD);
2716 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2717 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2718 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2719 return method->is_overpass();
2720 JVM_END
2721
2722 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2723 JVMWrapper("JVM_GetMethodIxIxUTF");
2724 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2725 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2726 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2727 return method->name()->as_utf8();
2728 JVM_END
2729
2730
2731 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2732 JVMWrapper("JVM_GetMethodIxSignatureUTF");
2733 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2734 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2735 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2736 return method->signature()->as_utf8();
2737 JVM_END
2738
2739 /**
2740 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2741 * read entries in the constant pool. Since the old verifier always
2742 * works on a copy of the code, it will not see any rewriting that
2743 * may possibly occur in the middle of verification. So it is important
2744 * that nothing it calls tries to use the cpCache instead of the raw
2745 * constant pool, so we must use cp->uncached_x methods when appropriate.
2746 */
2747 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2748 JVMWrapper("JVM_GetCPFieldNameUTF");
2749 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2750 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2751 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2752 switch (cp->tag_at(cp_index).value()) {
2753 case JVM_CONSTANT_Fieldref:
2754 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2755 default:
2756 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2757 }
2758 ShouldNotReachHere();
2759 return NULL;
2760 JVM_END
2761
2762
2763 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2764 JVMWrapper("JVM_GetCPMethodNameUTF");
2765 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2766 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2767 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2768 switch (cp->tag_at(cp_index).value()) {
2769 case JVM_CONSTANT_InterfaceMethodref:
2770 case JVM_CONSTANT_Methodref:
2771 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2772 default:
2773 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2774 }
2775 ShouldNotReachHere();
2776 return NULL;
2777 JVM_END
2778
2779
2780 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2781 JVMWrapper("JVM_GetCPMethodSignatureUTF");
2782 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2783 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2784 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2785 switch (cp->tag_at(cp_index).value()) {
2786 case JVM_CONSTANT_InterfaceMethodref:
2787 case JVM_CONSTANT_Methodref:
2788 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2789 default:
2790 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2791 }
2792 ShouldNotReachHere();
2793 return NULL;
2794 JVM_END
2795
2796
2797 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2798 JVMWrapper("JVM_GetCPFieldSignatureUTF");
2799 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2800 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2801 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2802 switch (cp->tag_at(cp_index).value()) {
2803 case JVM_CONSTANT_Fieldref:
2804 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2805 default:
2806 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2807 }
2808 ShouldNotReachHere();
2809 return NULL;
2810 JVM_END
2811
2812
2813 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2814 JVMWrapper("JVM_GetCPClassNameUTF");
2815 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2816 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2817 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2818 Symbol* classname = cp->klass_name_at(cp_index);
2819 return classname->as_utf8();
2820 JVM_END
2821
2822
2823 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2824 JVMWrapper("JVM_GetCPFieldClassNameUTF");
2825 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2826 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2827 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2828 switch (cp->tag_at(cp_index).value()) {
2829 case JVM_CONSTANT_Fieldref: {
2830 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2831 Symbol* classname = cp->klass_name_at(class_index);
2832 return classname->as_utf8();
2833 }
2834 default:
2835 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2836 }
2837 ShouldNotReachHere();
2838 return NULL;
2839 JVM_END
2840
2841
2842 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2843 JVMWrapper("JVM_GetCPMethodClassNameUTF");
2844 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2845 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2846 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2847 switch (cp->tag_at(cp_index).value()) {
2848 case JVM_CONSTANT_Methodref:
2849 case JVM_CONSTANT_InterfaceMethodref: {
2850 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2851 Symbol* classname = cp->klass_name_at(class_index);
2852 return classname->as_utf8();
2853 }
2854 default:
2855 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2856 }
2857 ShouldNotReachHere();
2858 return NULL;
2859 JVM_END
2860
2861
2862 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2863 JVMWrapper("JVM_GetCPFieldModifiers");
2864 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2865 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2866 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2867 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2868 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2869 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2870 switch (cp->tag_at(cp_index).value()) {
2871 case JVM_CONSTANT_Fieldref: {
2872 Symbol* name = cp->uncached_name_ref_at(cp_index);
2873 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2874 InstanceKlass* ik = InstanceKlass::cast(k_called);
2875 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2876 if (fs.name() == name && fs.signature() == signature) {
2877 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2878 }
2879 }
2880 return -1;
2881 }
2882 default:
2883 fatal("JVM_GetCPFieldModifiers: illegal constant");
2884 }
2885 ShouldNotReachHere();
2886 return 0;
2887 JVM_END
2888
2889
2890 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2891 JVMWrapper("JVM_GetCPMethodModifiers");
2892 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2893 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2894 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2895 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2896 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2897 switch (cp->tag_at(cp_index).value()) {
2898 case JVM_CONSTANT_Methodref:
2899 case JVM_CONSTANT_InterfaceMethodref: {
2900 Symbol* name = cp->uncached_name_ref_at(cp_index);
2901 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2902 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2903 int methods_count = methods->length();
2904 for (int i = 0; i < methods_count; i++) {
2905 Method* method = methods->at(i);
2906 if (method->name() == name && method->signature() == signature) {
2907 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2908 }
2909 }
2910 return -1;
2911 }
2912 default:
2913 fatal("JVM_GetCPMethodModifiers: illegal constant");
2914 }
2915 ShouldNotReachHere();
2916 return 0;
2917 JVM_END
2918
2919
2920 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2921
2922 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2923 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2924 JVM_END
2925
2926
2927 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2928 JVMWrapper("JVM_IsSameClassPackage");
2929 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2930 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2931 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2932 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2933 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2934 JVM_END
2935
2936 // Printing support //////////////////////////////////////////////////
2937 extern "C" {
2938
2939 ATTRIBUTE_PRINTF(3, 0)
2940 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2941 // Reject count values that are negative signed values converted to
2942 // unsigned; see bug 4399518, 4417214
2943 if ((intptr_t)count <= 0) return -1;
2944
2945 int result = os::vsnprintf(str, count, fmt, args);
2946 if (result > 0 && (size_t)result >= count) {
2947 result = -1;
2948 }
2949
2950 return result;
2951 }
2952
2953 ATTRIBUTE_PRINTF(3, 4)
2954 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2955 va_list args;
2956 int len;
2957 va_start(args, fmt);
2958 len = jio_vsnprintf(str, count, fmt, args);
2959 va_end(args);
2960 return len;
2961 }
2962
2963 ATTRIBUTE_PRINTF(2, 3)
2964 int jio_fprintf(FILE* f, const char *fmt, ...) {
2965 int len;
2966 va_list args;
2967 va_start(args, fmt);
2968 len = jio_vfprintf(f, fmt, args);
2969 va_end(args);
2970 return len;
2971 }
2972
2973 ATTRIBUTE_PRINTF(2, 0)
2974 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2975 if (Arguments::vfprintf_hook() != NULL) {
2976 return Arguments::vfprintf_hook()(f, fmt, args);
2977 } else {
2978 return vfprintf(f, fmt, args);
2979 }
2980 }
2981
2982 ATTRIBUTE_PRINTF(1, 2)
2983 JNIEXPORT int jio_printf(const char *fmt, ...) {
2984 int len;
2985 va_list args;
2986 va_start(args, fmt);
2987 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2988 va_end(args);
2989 return len;
2990 }
2991
2992 // HotSpot specific jio method
2993 void jio_print(const char* s, size_t len) {
2994 // Try to make this function as atomic as possible.
2995 if (Arguments::vfprintf_hook() != NULL) {
2996 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2997 } else {
2998 // Make an unused local variable to avoid warning from gcc compiler.
2999 size_t count = ::write(defaultStream::output_fd(), s, (int)len);
3000 }
3001 }
3002
3003 } // Extern C
3004
3005 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
3006
3007 // In most of the JVM thread support functions we need to access the
3008 // thread through a ThreadsListHandle to prevent it from exiting and
3009 // being reclaimed while we try to operate on it. The exceptions to this
3010 // rule are when operating on the current thread, or if the monitor of
3011 // the target java.lang.Thread is locked at the Java level - in both
3012 // cases the target cannot exit.
3013
3014 static void thread_entry(JavaThread* thread, TRAPS) {
3015 HandleMark hm(THREAD);
3016 Handle obj(THREAD, thread->threadObj());
3017 JavaValue result(T_VOID);
3018 JavaCalls::call_virtual(&result,
3019 obj,
3020 SystemDictionary::Thread_klass(),
3021 vmSymbols::run_method_name(),
3022 vmSymbols::void_method_signature(),
3023 THREAD);
3024 }
3025
3026
3027 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
3028 JVMWrapper("JVM_StartThread");
3029 JavaThread *native_thread = NULL;
3030
3031 // We cannot hold the Threads_lock when we throw an exception,
3032 // due to rank ordering issues. Example: we might need to grab the
3033 // Heap_lock while we construct the exception.
3034 bool throw_illegal_thread_state = false;
3035
3036 // We must release the Threads_lock before we can post a jvmti event
3037 // in Thread::start.
3038 {
3039 // Ensure that the C++ Thread and OSThread structures aren't freed before
3040 // we operate.
3041 MutexLocker mu(Threads_lock);
3042
3043 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
3044 // re-starting an already started thread, so we should usually find
3045 // that the JavaThread is null. However for a JNI attached thread
3046 // there is a small window between the Thread object being created
3047 // (with its JavaThread set) and the update to its threadStatus, so we
3048 // have to check for this
3049 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
3050 throw_illegal_thread_state = true;
3051 } else {
3052 // We could also check the stillborn flag to see if this thread was already stopped, but
3053 // for historical reasons we let the thread detect that itself when it starts running
3054
3055 jlong size =
3056 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3057 // Allocate the C++ Thread structure and create the native thread. The
3058 // stack size retrieved from java is 64-bit signed, but the constructor takes
3059 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3060 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3061 // - Avoid passing negative values which would result in really large stacks.
3062 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3063 size_t sz = size > 0 ? (size_t) size : 0;
3064 native_thread = new JavaThread(&thread_entry, sz);
3065
3066 // At this point it may be possible that no osthread was created for the
3067 // JavaThread due to lack of memory. Check for this situation and throw
3068 // an exception if necessary. Eventually we may want to change this so
3069 // that we only grab the lock if the thread was created successfully -
3070 // then we can also do this check and throw the exception in the
3071 // JavaThread constructor.
3072 if (native_thread->osthread() != NULL) {
3073 // Note: the current thread is not being used within "prepare".
3074 native_thread->prepare(jthread);
3075 }
3076 }
3077 }
3078
3079 if (throw_illegal_thread_state) {
3080 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3081 }
3082
3083 assert(native_thread != NULL, "Starting null thread?");
3084
3085 if (native_thread->osthread() == NULL) {
3086 // No one should hold a reference to the 'native_thread'.
3087 native_thread->smr_delete();
3088 if (JvmtiExport::should_post_resource_exhausted()) {
3089 JvmtiExport::post_resource_exhausted(
3090 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3091 os::native_thread_creation_failed_msg());
3092 }
3093 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3094 os::native_thread_creation_failed_msg());
3095 }
3096
3097 #if INCLUDE_JFR
3098 if (Jfr::is_recording() && EventThreadStart::is_enabled() &&
3099 EventThreadStart::is_stacktrace_enabled()) {
3100 JfrThreadLocal* tl = native_thread->jfr_thread_local();
3101 // skip Thread.start() and Thread.start0()
3102 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2));
3103 }
3104 #endif
3105
3106 Thread::start(native_thread);
3107
3108 JVM_END
3109
3110
3111 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3112 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
3113 // but is thought to be reliable and simple. In the case, where the receiver is the
3114 // same thread as the sender, no VM_Operation is needed.
3115 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3116 JVMWrapper("JVM_StopThread");
3117
3118 // A nested ThreadsListHandle will grab the Threads_lock so create
3119 // tlh before we resolve throwable.
3120 ThreadsListHandle tlh(thread);
3121 oop java_throwable = JNIHandles::resolve(throwable);
3122 if (java_throwable == NULL) {
3123 THROW(vmSymbols::java_lang_NullPointerException());
3124 }
3125 oop java_thread = NULL;
3126 JavaThread* receiver = NULL;
3127 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3128 Events::log_exception(thread,
3129 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3130 p2i(receiver), p2i(java_thread), p2i(throwable));
3131
3132 if (is_alive) {
3133 // jthread refers to a live JavaThread.
3134 if (thread == receiver) {
3135 // Exception is getting thrown at self so no VM_Operation needed.
3136 THROW_OOP(java_throwable);
3137 } else {
3138 // Use a VM_Operation to throw the exception.
3139 Thread::send_async_exception(java_thread, java_throwable);
3140 }
3141 } else {
3142 // Either:
3143 // - target thread has not been started before being stopped, or
3144 // - target thread already terminated
3145 // We could read the threadStatus to determine which case it is
3146 // but that is overkill as it doesn't matter. We must set the
3147 // stillborn flag for the first case, and if the thread has already
3148 // exited setting this flag has no effect.
3149 java_lang_Thread::set_stillborn(java_thread);
3150 }
3151 JVM_END
3152
3153
3154 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3155 JVMWrapper("JVM_IsThreadAlive");
3156
3157 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3158 return java_lang_Thread::is_alive(thread_oop);
3159 JVM_END
3160
3161
3162 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3163 JVMWrapper("JVM_SuspendThread");
3164
3165 ThreadsListHandle tlh(thread);
3166 JavaThread* receiver = NULL;
3167 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3168 if (is_alive) {
3169 // jthread refers to a live JavaThread.
3170 {
3171 MutexLocker ml(receiver->SR_lock(), Mutex::_no_safepoint_check_flag);
3172 if (receiver->is_external_suspend()) {
3173 // Don't allow nested external suspend requests. We can't return
3174 // an error from this interface so just ignore the problem.
3175 return;
3176 }
3177 if (receiver->is_exiting()) { // thread is in the process of exiting
3178 return;
3179 }
3180 receiver->set_external_suspend();
3181 }
3182
3183 // java_suspend() will catch threads in the process of exiting
3184 // and will ignore them.
3185 receiver->java_suspend();
3186
3187 // It would be nice to have the following assertion in all the
3188 // time, but it is possible for a racing resume request to have
3189 // resumed this thread right after we suspended it. Temporarily
3190 // enable this assertion if you are chasing a different kind of
3191 // bug.
3192 //
3193 // assert(java_lang_Thread::thread(receiver->threadObj()) == NULL ||
3194 // receiver->is_being_ext_suspended(), "thread is not suspended");
3195 }
3196 JVM_END
3197
3198
3199 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3200 JVMWrapper("JVM_ResumeThread");
3201
3202 ThreadsListHandle tlh(thread);
3203 JavaThread* receiver = NULL;
3204 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3205 if (is_alive) {
3206 // jthread refers to a live JavaThread.
3207
3208 // This is the original comment for this Threads_lock grab:
3209 // We need to *always* get the threads lock here, since this operation cannot be allowed during
3210 // a safepoint. The safepoint code relies on suspending a thread to examine its state. If other
3211 // threads randomly resumes threads, then a thread might not be suspended when the safepoint code
3212 // looks at it.
3213 //
3214 // The above comment dates back to when we had both internal and
3215 // external suspend APIs that shared a common underlying mechanism.
3216 // External suspend is now entirely cooperative and doesn't share
3217 // anything with internal suspend. That said, there are some
3218 // assumptions in the VM that an external resume grabs the
3219 // Threads_lock. We can't drop the Threads_lock grab here until we
3220 // resolve the assumptions that exist elsewhere.
3221 //
3222 MutexLocker ml(Threads_lock);
3223 receiver->java_resume();
3224 }
3225 JVM_END
3226
3227
3228 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3229 JVMWrapper("JVM_SetThreadPriority");
3230
3231 ThreadsListHandle tlh(thread);
3232 oop java_thread = NULL;
3233 JavaThread* receiver = NULL;
3234 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3235 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3236
3237 if (is_alive) {
3238 // jthread refers to a live JavaThread.
3239 Thread::set_priority(receiver, (ThreadPriority)prio);
3240 }
3241 // Implied else: If the JavaThread hasn't started yet, then the
3242 // priority set in the java.lang.Thread object above will be pushed
3243 // down when it does start.
3244 JVM_END
3245
3246
3247 JVM_ENTRY(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3248 JVMWrapper("JVM_Yield");
3249 if (os::dont_yield()) return;
3250 HOTSPOT_THREAD_YIELD();
3251 os::naked_yield();
3252 JVM_END
3253
3254 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3255 assert(event != NULL, "invariant");
3256 assert(event->should_commit(), "invariant");
3257 event->set_time(millis);
3258 event->commit();
3259 }
3260
3261 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3262 JVMWrapper("JVM_Sleep");
3263
3264 if (millis < 0) {
3265 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3266 }
3267
3268 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3269 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3270 }
3271
3272 // Save current thread state and restore it at the end of this block.
3273 // And set new thread state to SLEEPING.
3274 JavaThreadSleepState jtss(thread);
3275
3276 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3277 EventThreadSleep event;
3278
3279 if (millis == 0) {
3280 os::naked_yield();
3281 } else {
3282 ThreadState old_state = thread->osthread()->get_state();
3283 thread->osthread()->set_state(SLEEPING);
3284 if (!thread->sleep(millis)) { // interrupted
3285 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3286 // us while we were sleeping. We do not overwrite those.
3287 if (!HAS_PENDING_EXCEPTION) {
3288 if (event.should_commit()) {
3289 post_thread_sleep_event(&event, millis);
3290 }
3291 HOTSPOT_THREAD_SLEEP_END(1);
3292
3293 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3294 // to properly restore the thread state. That's likely wrong.
3295 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3296 }
3297 }
3298 thread->osthread()->set_state(old_state);
3299 }
3300 if (event.should_commit()) {
3301 post_thread_sleep_event(&event, millis);
3302 }
3303 HOTSPOT_THREAD_SLEEP_END(0);
3304 JVM_END
3305
3306 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3307 JVMWrapper("JVM_CurrentThread");
3308 oop jthread = thread->threadObj();
3309 assert(jthread != NULL, "no current thread!");
3310 return JNIHandles::make_local(THREAD, jthread);
3311 JVM_END
3312
3313 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3314 JVMWrapper("JVM_Interrupt");
3315
3316 ThreadsListHandle tlh(thread);
3317 JavaThread* receiver = NULL;
3318 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3319 if (is_alive) {
3320 // jthread refers to a live JavaThread.
3321 receiver->interrupt();
3322 }
3323 JVM_END
3324
3325
3326 // Return true iff the current thread has locked the object passed in
3327
3328 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3329 JVMWrapper("JVM_HoldsLock");
3330 assert(THREAD->is_Java_thread(), "sanity check");
3331 if (obj == NULL) {
3332 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3333 }
3334 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3335 return ObjectSynchronizer::current_thread_holds_lock((JavaThread*)THREAD, h_obj);
3336 JVM_END
3337
3338
3339 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3340 JVMWrapper("JVM_DumpAllStacks");
3341 VM_PrintThreads op;
3342 VMThread::execute(&op);
3343 if (JvmtiExport::should_post_data_dump()) {
3344 JvmtiExport::post_data_dump();
3345 }
3346 JVM_END
3347
3348 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3349 JVMWrapper("JVM_SetNativeThreadName");
3350
3351 // We don't use a ThreadsListHandle here because the current thread
3352 // must be alive.
3353 oop java_thread = JNIHandles::resolve_non_null(jthread);
3354 JavaThread* thr = java_lang_Thread::thread(java_thread);
3355 if (thread == thr && !thr->has_attached_via_jni()) {
3356 // Thread naming is only supported for the current thread and
3357 // we don't set the name of an attached thread to avoid stepping
3358 // on other programs.
3359 ResourceMark rm(thread);
3360 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3361 os::set_native_thread_name(thread_name);
3362 }
3363 JVM_END
3364
3365 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3366
3367 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3368 JVMWrapper("JVM_GetClassContext");
3369 ResourceMark rm(THREAD);
3370 JvmtiVMObjectAllocEventCollector oam;
3371 vframeStream vfst(thread);
3372
3373 if (SystemDictionary::reflect_CallerSensitive_klass() != NULL) {
3374 // This must only be called from SecurityManager.getClassContext
3375 Method* m = vfst.method();
3376 if (!(m->method_holder() == SystemDictionary::SecurityManager_klass() &&
3377 m->name() == vmSymbols::getClassContext_name() &&
3378 m->signature() == vmSymbols::void_class_array_signature())) {
3379 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3380 }
3381 }
3382
3383 // Collect method holders
3384 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3385 for (; !vfst.at_end(); vfst.security_next()) {
3386 Method* m = vfst.method();
3387 // Native frames are not returned
3388 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3389 Klass* holder = m->method_holder();
3390 assert(holder->is_klass(), "just checking");
3391 klass_array->append(holder);
3392 }
3393 }
3394
3395 // Create result array of type [Ljava/lang/Class;
3396 objArrayOop result = oopFactory::new_objArray(SystemDictionary::Class_klass(), klass_array->length(), CHECK_NULL);
3397 // Fill in mirrors corresponding to method holders
3398 for (int i = 0; i < klass_array->length(); i++) {
3399 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3400 }
3401
3402 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3403 JVM_END
3404
3405
3406 // java.lang.Package ////////////////////////////////////////////////////////////////
3407
3408
3409 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3410 JVMWrapper("JVM_GetSystemPackage");
3411 ResourceMark rm(THREAD);
3412 JvmtiVMObjectAllocEventCollector oam;
3413 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3414 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3415 return (jstring) JNIHandles::make_local(THREAD, result);
3416 JVM_END
3417
3418
3419 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3420 JVMWrapper("JVM_GetSystemPackages");
3421 JvmtiVMObjectAllocEventCollector oam;
3422 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3423 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3424 JVM_END
3425
3426
3427 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3428
3429
3430 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3431 JVMWrapper("JVM_GetAndClearReferencePendingList");
3432
3433 MonitorLocker ml(Heap_lock);
3434 oop ref = Universe::reference_pending_list();
3435 if (ref != NULL) {
3436 Universe::clear_reference_pending_list();
3437 }
3438 return JNIHandles::make_local(THREAD, ref);
3439 JVM_END
3440
3441 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3442 JVMWrapper("JVM_HasReferencePendingList");
3443 MonitorLocker ml(Heap_lock);
3444 return Universe::has_reference_pending_list();
3445 JVM_END
3446
3447 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3448 JVMWrapper("JVM_WaitForReferencePendingList");
3449 MonitorLocker ml(Heap_lock);
3450 while (!Universe::has_reference_pending_list()) {
3451 ml.wait();
3452 }
3453 JVM_END
3454
3455
3456 // ObjectInputStream ///////////////////////////////////////////////////////////////
3457
3458 // Return the first user-defined class loader up the execution stack, or null
3459 // if only code from the bootstrap or platform class loader is on the stack.
3460
3461 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3462 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3463 vfst.skip_reflection_related_frames(); // Only needed for 1.4 reflection
3464 oop loader = vfst.method()->method_holder()->class_loader();
3465 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3466 return JNIHandles::make_local(THREAD, loader);
3467 }
3468 }
3469 return NULL;
3470 JVM_END
3471
3472
3473 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3474
3475
3476 // resolve array handle and check arguments
3477 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3478 if (arr == NULL) {
3479 THROW_0(vmSymbols::java_lang_NullPointerException());
3480 }
3481 oop a = JNIHandles::resolve_non_null(arr);
3482 if (!a->is_array()) {
3483 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3484 } else if (type_array_only && !a->is_typeArray()) {
3485 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3486 }
3487 return arrayOop(a);
3488 }
3489
3490
3491 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3492 JVMWrapper("JVM_GetArrayLength");
3493 arrayOop a = check_array(env, arr, false, CHECK_0);
3494 return a->length();
3495 JVM_END
3496
3497
3498 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3499 JVMWrapper("JVM_Array_Get");
3500 JvmtiVMObjectAllocEventCollector oam;
3501 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3502 jvalue value;
3503 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3504 oop box = Reflection::box(&value, type, CHECK_NULL);
3505 return JNIHandles::make_local(THREAD, box);
3506 JVM_END
3507
3508
3509 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3510 JVMWrapper("JVM_GetPrimitiveArrayElement");
3511 jvalue value;
3512 value.i = 0; // to initialize value before getting used in CHECK
3513 arrayOop a = check_array(env, arr, true, CHECK_(value));
3514 assert(a->is_typeArray(), "just checking");
3515 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3516 BasicType wide_type = (BasicType) wCode;
3517 if (type != wide_type) {
3518 Reflection::widen(&value, type, wide_type, CHECK_(value));
3519 }
3520 return value;
3521 JVM_END
3522
3523
3524 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3525 JVMWrapper("JVM_SetArrayElement");
3526 arrayOop a = check_array(env, arr, false, CHECK);
3527 oop box = JNIHandles::resolve(val);
3528 jvalue value;
3529 value.i = 0; // to initialize value before getting used in CHECK
3530 BasicType value_type;
3531 if (a->is_objArray()) {
3532 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3533 value_type = Reflection::unbox_for_regular_object(box, &value);
3534 } else {
3535 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3536 }
3537 Reflection::array_set(&value, a, index, value_type, CHECK);
3538 JVM_END
3539
3540
3541 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3542 JVMWrapper("JVM_SetPrimitiveArrayElement");
3543 arrayOop a = check_array(env, arr, true, CHECK);
3544 assert(a->is_typeArray(), "just checking");
3545 BasicType value_type = (BasicType) vCode;
3546 Reflection::array_set(&v, a, index, value_type, CHECK);
3547 JVM_END
3548
3549
3550 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3551 JVMWrapper("JVM_NewArray");
3552 JvmtiVMObjectAllocEventCollector oam;
3553 oop element_mirror = JNIHandles::resolve(eltClass);
3554 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3555 return JNIHandles::make_local(THREAD, result);
3556 JVM_END
3557
3558
3559 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3560 JVMWrapper("JVM_NewMultiArray");
3561 JvmtiVMObjectAllocEventCollector oam;
3562 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3563 oop element_mirror = JNIHandles::resolve(eltClass);
3564 assert(dim_array->is_typeArray(), "just checking");
3565 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3566 return JNIHandles::make_local(THREAD, result);
3567 JVM_END
3568
3569
3570 // Library support ///////////////////////////////////////////////////////////////////////////
3571
3572 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name))
3573 //%note jvm_ct
3574 JVMWrapper("JVM_LoadLibrary");
3575 char ebuf[1024];
3576 void *load_result;
3577 {
3578 ThreadToNativeFromVM ttnfvm(thread);
3579 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3580 }
3581 if (load_result == NULL) {
3582 char msg[1024];
3583 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3584 // Since 'ebuf' may contain a string encoded using
3585 // platform encoding scheme, we need to pass
3586 // Exceptions::unsafe_to_utf8 to the new_exception method
3587 // as the last argument. See bug 6367357.
3588 Handle h_exception =
3589 Exceptions::new_exception(thread,
3590 vmSymbols::java_lang_UnsatisfiedLinkError(),
3591 msg, Exceptions::unsafe_to_utf8);
3592
3593 THROW_HANDLE_0(h_exception);
3594 }
3595 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3596 return load_result;
3597 JVM_END
3598
3599
3600 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3601 JVMWrapper("JVM_UnloadLibrary");
3602 os::dll_unload(handle);
3603 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3604 JVM_END
3605
3606
3607 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3608 JVMWrapper("JVM_FindLibraryEntry");
3609 void* find_result = os::dll_lookup(handle, name);
3610 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3611 find_result != NULL ? "Found" : "Failed to find",
3612 name, p2i(handle));
3613 return find_result;
3614 JVM_END
3615
3616
3617 // JNI version ///////////////////////////////////////////////////////////////////////////////
3618
3619 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3620 JVMWrapper("JVM_IsSupportedJNIVersion");
3621 return Threads::is_supported_jni_version_including_1_1(version);
3622 JVM_END
3623
3624
3625 // String support ///////////////////////////////////////////////////////////////////////////
3626
3627 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3628 JVMWrapper("JVM_InternString");
3629 JvmtiVMObjectAllocEventCollector oam;
3630 if (str == NULL) return NULL;
3631 oop string = JNIHandles::resolve_non_null(str);
3632 oop result = StringTable::intern(string, CHECK_NULL);
3633 return (jstring) JNIHandles::make_local(THREAD, result);
3634 JVM_END
3635
3636
3637 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3638
3639 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3640 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3641 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3642 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3643 // nature. JavaThreads will be "in native" when using this API from JDK code.
3644
3645
3646 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3647 VM_Exit::block_if_vm_exited();
3648 JVMWrapper("JVM_RawMonitorCreate");
3649 return new os::PlatformMutex();
3650 }
3651
3652
3653 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3654 VM_Exit::block_if_vm_exited();
3655 JVMWrapper("JVM_RawMonitorDestroy");
3656 delete ((os::PlatformMutex*) mon);
3657 }
3658
3659
3660 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3661 VM_Exit::block_if_vm_exited();
3662 JVMWrapper("JVM_RawMonitorEnter");
3663 ((os::PlatformMutex*) mon)->lock();
3664 return 0;
3665 }
3666
3667
3668 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3669 VM_Exit::block_if_vm_exited();
3670 JVMWrapper("JVM_RawMonitorExit");
3671 ((os::PlatformMutex*) mon)->unlock();
3672 }
3673
3674
3675 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3676
3677 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3678 Handle loader, Handle protection_domain,
3679 jboolean throwError, TRAPS) {
3680 // Security Note:
3681 // The Java level wrapper will perform the necessary security check allowing
3682 // us to pass the NULL as the initiating class loader. The VM is responsible for
3683 // the checkPackageAccess relative to the initiating class loader via the
3684 // protection_domain. The protection_domain is passed as NULL by the java code
3685 // if there is no security manager in 3-arg Class.forName().
3686 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3687
3688 // Check if we should initialize the class
3689 if (init && klass->is_instance_klass()) {
3690 klass->initialize(CHECK_NULL);
3691 }
3692 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3693 }
3694
3695
3696 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3697
3698 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3699 JVMWrapper("JVM_InvokeMethod");
3700 Handle method_handle;
3701 if (thread->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3702 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3703 Handle receiver(THREAD, JNIHandles::resolve(obj));
3704 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3705 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3706 jobject res = JNIHandles::make_local(THREAD, result);
3707 if (JvmtiExport::should_post_vm_object_alloc()) {
3708 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3709 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3710 if (java_lang_Class::is_primitive(ret_type)) {
3711 // Only for primitive type vm allocates memory for java object.
3712 // See box() method.
3713 JvmtiExport::post_vm_object_alloc(thread, result);
3714 }
3715 }
3716 return res;
3717 } else {
3718 THROW_0(vmSymbols::java_lang_StackOverflowError());
3719 }
3720 JVM_END
3721
3722
3723 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3724 JVMWrapper("JVM_NewInstanceFromConstructor");
3725 oop constructor_mirror = JNIHandles::resolve(c);
3726 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3727 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3728 jobject res = JNIHandles::make_local(THREAD, result);
3729 if (JvmtiExport::should_post_vm_object_alloc()) {
3730 JvmtiExport::post_vm_object_alloc(thread, result);
3731 }
3732 return res;
3733 JVM_END
3734
3735 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3736
3737 JVM_LEAF(jboolean, JVM_SupportsCX8())
3738 JVMWrapper("JVM_SupportsCX8");
3739 return VM_Version::supports_cx8();
3740 JVM_END
3741
3742 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3743 JVMWrapper("JVM_InitializeFromArchive");
3744 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3745 assert(k->is_klass(), "just checking");
3746 HeapShared::initialize_from_archived_subgraph(k);
3747 JVM_END
3748
3749 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3750 jclass caller,
3751 jstring invokedName,
3752 jobject invokedType,
3753 jobject methodType,
3754 jobject implMethodMember,
3755 jobject instantiatedMethodType,
3756 jclass lambdaProxyClass))
3757 JVMWrapper("JVM_RegisterLambdaProxyClassForArchiving");
3758 #if INCLUDE_CDS
3759 if (!DynamicDumpSharedSpaces) {
3760 return;
3761 }
3762
3763 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3764 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3765 if (caller_ik->is_hidden() || caller_ik->is_unsafe_anonymous()) {
3766 // VM anonymous classes and hidden classes not of type lambda proxy classes are currently not being archived.
3767 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3768 // registered for archiving.
3769 return;
3770 }
3771 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3772 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3773 assert(lambda_ik->is_hidden(), "must be a hidden class");
3774 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3775
3776 Symbol* invoked_name = NULL;
3777 if (invokedName != NULL) {
3778 invoked_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(invokedName));
3779 }
3780 Handle invoked_type_oop(THREAD, JNIHandles::resolve_non_null(invokedType));
3781 Symbol* invoked_type = java_lang_invoke_MethodType::as_signature(invoked_type_oop(), true);
3782
3783 Handle method_type_oop(THREAD, JNIHandles::resolve_non_null(methodType));
3784 Symbol* method_type = java_lang_invoke_MethodType::as_signature(method_type_oop(), true);
3785
3786 Handle impl_method_member_oop(THREAD, JNIHandles::resolve_non_null(implMethodMember));
3787 assert(java_lang_invoke_MemberName::is_method(impl_method_member_oop()), "must be");
3788 Method* m = java_lang_invoke_MemberName::vmtarget(impl_method_member_oop());
3789
3790 Handle instantiated_method_type_oop(THREAD, JNIHandles::resolve_non_null(instantiatedMethodType));
3791 Symbol* instantiated_method_type = java_lang_invoke_MethodType::as_signature(instantiated_method_type_oop(), true);
3792
3793 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, invoked_name, invoked_type,
3794 method_type, m, instantiated_method_type);
3795 #endif // INCLUDE_CDS
3796 JVM_END
3797
3798 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3799 jclass caller,
3800 jstring invokedName,
3801 jobject invokedType,
3802 jobject methodType,
3803 jobject implMethodMember,
3804 jobject instantiatedMethodType,
3805 jboolean initialize))
3806 JVMWrapper("JVM_LookupLambdaProxyClassFromArchive");
3807 #if INCLUDE_CDS
3808 if (!DynamicArchive::is_mapped()) {
3809 return NULL;
3810 }
3811
3812 if (invokedName == NULL || invokedType == NULL || methodType == NULL ||
3813 implMethodMember == NULL || instantiatedMethodType == NULL) {
3814 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
3815 }
3816
3817 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3818 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3819 if (!caller_ik->is_shared()) {
3820 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3821 return NULL;
3822 }
3823
3824 Symbol* invoked_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(invokedName));
3825 Handle invoked_type_oop(THREAD, JNIHandles::resolve_non_null(invokedType));
3826 Symbol* invoked_type = java_lang_invoke_MethodType::as_signature(invoked_type_oop(), true);
3827
3828 Handle method_type_oop(THREAD, JNIHandles::resolve_non_null(methodType));
3829 Symbol* method_type = java_lang_invoke_MethodType::as_signature(method_type_oop(), true);
3830
3831 Handle impl_method_member_oop(THREAD, JNIHandles::resolve_non_null(implMethodMember));
3832 assert(java_lang_invoke_MemberName::is_method(impl_method_member_oop()), "must be");
3833 Method* m = java_lang_invoke_MemberName::vmtarget(impl_method_member_oop());
3834
3835 Handle instantiated_method_type_oop(THREAD, JNIHandles::resolve_non_null(instantiatedMethodType));
3836 Symbol* instantiated_method_type = java_lang_invoke_MethodType::as_signature(instantiated_method_type_oop(), true);
3837
3838 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, invoked_name, invoked_type,
3839 method_type, m, instantiated_method_type);
3840 jclass jcls = NULL;
3841 if (lambda_ik != NULL) {
3842 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, initialize, THREAD);
3843 jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3844 }
3845 return jcls;
3846 #else
3847 return NULL;
3848 #endif // INCLUDE_CDS
3849 JVM_END
3850
3851 JVM_ENTRY(void, JVM_CDSTraceResolve(JNIEnv* env, jclass ignored, jstring line))
3852 #if INCLUDE_CDS
3853 if (line != NULL && DumpLoadedClassList != NULL && classlist_file->is_open()) {
3854 ResourceMark rm(THREAD);
3855 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3856 char* c_line = java_lang_String::as_utf8_string(h_line());
3857 classlist_file->print_cr("%s %s", LambdaFormInvokers::lambda_form_invoker_tag(), c_line);
3858 }
3859 #endif // INCLUDE_CDS
3860 JVM_END
3861
3862 JVM_ENTRY(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3863 JVMWrapper("JVM_IsCDSDumpingEnable");
3864 return DynamicDumpSharedSpaces;
3865 JVM_END
3866
3867 JVM_ENTRY(jboolean, JVM_IsCDSSharingEnabled(JNIEnv* env))
3868 JVMWrapper("JVM_IsCDSSharingEnable");
3869 return UseSharedSpaces;
3870 JVM_END
3871
3872 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForCDSDump())
3873 JVMWrapper("JVM_GetRandomSeedForCDSDump");
3874 if (DumpSharedSpaces) {
3875 const char* release = Abstract_VM_Version::vm_release();
3876 const char* dbg_level = Abstract_VM_Version::jdk_debug_level();
3877 const char* version = VM_Version::internal_vm_info_string();
3878 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3879 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3880 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3881 seed += (jlong)Abstract_VM_Version::vm_major_version();
3882 seed += (jlong)Abstract_VM_Version::vm_minor_version();
3883 seed += (jlong)Abstract_VM_Version::vm_security_version();
3884 seed += (jlong)Abstract_VM_Version::vm_patch_version();
3885 if (seed == 0) { // don't let this ever be zero.
3886 seed = 0x87654321;
3887 }
3888 log_debug(cds)("JVM_GetRandomSeedForCDSDump() = " JLONG_FORMAT, seed);
3889 return seed;
3890 } else {
3891 return 0;
3892 }
3893 JVM_END
3894
3895 // Returns an array of all live Thread objects (VM internal JavaThreads,
3896 // jvmti agent threads, and JNI attaching threads are skipped)
3897 // See CR 6404306 regarding JNI attaching threads
3898 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3899 ResourceMark rm(THREAD);
3900 ThreadsListEnumerator tle(THREAD, false, false);
3901 JvmtiVMObjectAllocEventCollector oam;
3902
3903 int num_threads = tle.num_threads();
3904 objArrayOop r = oopFactory::new_objArray(SystemDictionary::Thread_klass(), num_threads, CHECK_NULL);
3905 objArrayHandle threads_ah(THREAD, r);
3906
3907 for (int i = 0; i < num_threads; i++) {
3908 Handle h = tle.get_threadObj(i);
3909 threads_ah->obj_at_put(i, h());
3910 }
3911
3912 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3913 JVM_END
3914
3915
3916 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3917 // Return StackTraceElement[][], each element is the stack trace of a thread in
3918 // the corresponding entry in the given threads array
3919 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3920 JVMWrapper("JVM_DumpThreads");
3921 JvmtiVMObjectAllocEventCollector oam;
3922
3923 // Check if threads is null
3924 if (threads == NULL) {
3925 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3926 }
3927
3928 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3929 objArrayHandle ah(THREAD, a);
3930 int num_threads = ah->length();
3931 // check if threads is non-empty array
3932 if (num_threads == 0) {
3933 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3934 }
3935
3936 // check if threads is not an array of objects of Thread class
3937 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3938 if (k != SystemDictionary::Thread_klass()) {
3939 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3940 }
3941
3942 ResourceMark rm(THREAD);
3943
3944 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3945 for (int i = 0; i < num_threads; i++) {
3946 oop thread_obj = ah->obj_at(i);
3947 instanceHandle h(THREAD, (instanceOop) thread_obj);
3948 thread_handle_array->append(h);
3949 }
3950
3951 // The JavaThread references in thread_handle_array are validated
3952 // in VM_ThreadDump::doit().
3953 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3954 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3955
3956 JVM_END
3957
3958 // JVM monitoring and management support
3959 JVM_ENTRY_NO_ENV(void*, JVM_GetManagement(jint version))
3960 return Management::get_jmm_interface(version);
3961 JVM_END
3962
3963 // com.sun.tools.attach.VirtualMachine agent properties support
3964 //
3965 // Initialize the agent properties with the properties maintained in the VM
3966 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3967 JVMWrapper("JVM_InitAgentProperties");
3968 ResourceMark rm;
3969
3970 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3971
3972 PUTPROP(props, "sun.java.command", Arguments::java_command());
3973 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3974 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3975 return properties;
3976 JVM_END
3977
3978 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3979 {
3980 JVMWrapper("JVM_GetEnclosingMethodInfo");
3981 JvmtiVMObjectAllocEventCollector oam;
3982
3983 if (ofClass == NULL) {
3984 return NULL;
3985 }
3986 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3987 // Special handling for primitive objects
3988 if (java_lang_Class::is_primitive(mirror())) {
3989 return NULL;
3990 }
3991 Klass* k = java_lang_Class::as_Klass(mirror());
3992 if (!k->is_instance_klass()) {
3993 return NULL;
3994 }
3995 InstanceKlass* ik = InstanceKlass::cast(k);
3996 int encl_method_class_idx = ik->enclosing_method_class_index();
3997 if (encl_method_class_idx == 0) {
3998 return NULL;
3999 }
4000 objArrayOop dest_o = oopFactory::new_objArray(SystemDictionary::Object_klass(), 3, CHECK_NULL);
4001 objArrayHandle dest(THREAD, dest_o);
4002 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
4003 dest->obj_at_put(0, enc_k->java_mirror());
4004 int encl_method_method_idx = ik->enclosing_method_method_index();
4005 if (encl_method_method_idx != 0) {
4006 Symbol* sym = ik->constants()->symbol_at(
4007 extract_low_short_from_int(
4008 ik->constants()->name_and_type_at(encl_method_method_idx)));
4009 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
4010 dest->obj_at_put(1, str());
4011 sym = ik->constants()->symbol_at(
4012 extract_high_short_from_int(
4013 ik->constants()->name_and_type_at(encl_method_method_idx)));
4014 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
4015 dest->obj_at_put(2, str());
4016 }
4017 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
4018 }
4019 JVM_END
4020
4021 // Returns an array of java.lang.String objects containing the input arguments to the VM.
4022 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
4023 ResourceMark rm(THREAD);
4024
4025 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
4026 return NULL;
4027 }
4028
4029 char** vm_flags = Arguments::jvm_flags_array();
4030 char** vm_args = Arguments::jvm_args_array();
4031 int num_flags = Arguments::num_jvm_flags();
4032 int num_args = Arguments::num_jvm_args();
4033
4034 InstanceKlass* ik = SystemDictionary::String_klass();
4035 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
4036 objArrayHandle result_h(THREAD, r);
4037
4038 int index = 0;
4039 for (int j = 0; j < num_flags; j++, index++) {
4040 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
4041 result_h->obj_at_put(index, h());
4042 }
4043 for (int i = 0; i < num_args; i++, index++) {
4044 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
4045 result_h->obj_at_put(index, h());
4046 }
4047 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
4048 JVM_END
4049
4050 JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
4051 return os::get_signal_number(name);
4052 JVM_END