1 /*
2 * Copyright (c) 1997, 2022, 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 "cds/classListParser.hpp"
28 #include "cds/classListWriter.hpp"
29 #include "cds/dynamicArchive.hpp"
30 #include "cds/heapShared.hpp"
31 #include "cds/lambdaFormInvokers.hpp"
32 #include "classfile/classFileStream.hpp"
33 #include "classfile/classLoader.inline.hpp"
34 #include "classfile/classLoaderData.hpp"
35 #include "classfile/classLoaderData.inline.hpp"
36 #include "classfile/classLoadInfo.hpp"
37 #include "classfile/javaAssertions.hpp"
38 #include "classfile/javaClasses.inline.hpp"
39 #include "classfile/moduleEntry.hpp"
40 #include "classfile/modules.hpp"
41 #include "classfile/packageEntry.hpp"
42 #include "classfile/stringTable.hpp"
43 #include "classfile/symbolTable.hpp"
44 #include "classfile/systemDictionary.hpp"
45 #include "classfile/vmClasses.hpp"
46 #include "classfile/vmSymbols.hpp"
47 #include "gc/shared/collectedHeap.inline.hpp"
48 #include "interpreter/bytecode.hpp"
49 #include "interpreter/bytecodeUtils.hpp"
50 #include "jfr/jfrEvents.hpp"
51 #include "logging/log.hpp"
52 #include "memory/oopFactory.hpp"
53 #include "memory/referenceType.hpp"
54 #include "memory/resourceArea.hpp"
55 #include "memory/universe.hpp"
56 #include "oops/access.inline.hpp"
57 #include "oops/constantPool.hpp"
58 #include "oops/fieldStreams.inline.hpp"
59 #include "oops/flatArrayKlass.hpp"
60 #include "oops/instanceKlass.hpp"
61 #include "oops/klass.inline.hpp"
62 #include "oops/method.hpp"
63 #include "oops/recordComponent.hpp"
64 #include "oops/objArrayKlass.hpp"
65 #include "oops/objArrayOop.inline.hpp"
66 #include "oops/oop.inline.hpp"
67 #include "prims/jvm_misc.hpp"
68 #include "prims/jvmtiExport.hpp"
69 #include "prims/jvmtiThreadState.hpp"
70 #include "prims/stackwalk.hpp"
71 #include "runtime/arguments.hpp"
72 #include "runtime/atomic.hpp"
73 #include "runtime/globals_extension.hpp"
74 #include "runtime/handles.inline.hpp"
75 #include "runtime/init.hpp"
76 #include "runtime/interfaceSupport.inline.hpp"
77 #include "runtime/deoptimization.hpp"
78 #include "runtime/handshake.hpp"
79 #include "runtime/java.hpp"
80 #include "runtime/javaCalls.hpp"
81 #include "runtime/jfieldIDWorkaround.hpp"
82 #include "runtime/jniHandles.inline.hpp"
83 #include "runtime/os.inline.hpp"
84 #include "runtime/osThread.hpp"
85 #include "runtime/perfData.hpp"
86 #include "runtime/reflection.hpp"
87 #include "runtime/synchronizer.hpp"
88 #include "runtime/thread.inline.hpp"
89 #include "runtime/threadSMR.hpp"
90 #include "runtime/vframe.inline.hpp"
91 #include "runtime/vmOperations.hpp"
92 #include "runtime/vm_version.hpp"
93 #include "services/attachListener.hpp"
94 #include "services/management.hpp"
95 #include "services/threadService.hpp"
96 #include "utilities/copy.hpp"
97 #include "utilities/defaultStream.hpp"
98 #include "utilities/dtrace.hpp"
99 #include "utilities/events.hpp"
100 #include "utilities/macros.hpp"
101 #include "utilities/utf8.hpp"
102 #if INCLUDE_CDS
103 #include "classfile/systemDictionaryShared.hpp"
104 #endif
105 #if INCLUDE_JFR
106 #include "jfr/jfr.hpp"
107 #endif
108 #if INCLUDE_MANAGEMENT
109 #include "services/finalizerService.hpp"
110 #endif
111
112 #include <errno.h>
113
114 /*
115 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
116 such ctors and calls MUST NOT come between an oop declaration/init and its
117 usage because if objects are move this may cause various memory stomps, bus
118 errors and segfaults. Here is a cookbook for causing so called "naked oop
119 failures":
120
121 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
122 // Object address to be held directly in mirror & not visible to GC
123 oop mirror = JNIHandles::resolve_non_null(ofClass);
124
125 // If this ctor can hit a safepoint, moving objects around, then
126 ComplexConstructor foo;
127
128 // Boom! mirror may point to JUNK instead of the intended object
129 (some dereference of mirror)
130
131 // Here's another call that may block for GC, making mirror stale
132 MutexLocker ml(some_lock);
133
134 // And here's an initializer that can result in a stale oop
135 // all in one step.
136 oop o = call_that_can_throw_exception(TRAPS);
137
138
139 The solution is to keep the oop declaration BELOW the ctor or function
140 call that might cause a GC, do another resolve to reassign the oop, or
141 consider use of a Handle instead of an oop so there is immunity from object
142 motion. But note that the "QUICK" entries below do not have a handlemark
143 and thus can only support use of handles passed in.
144 */
145
146 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
147 ResourceMark rm;
148 int line_number = -1;
149 const char * source_file = NULL;
150 const char * trace = "explicit";
151 InstanceKlass* caller = NULL;
152 JavaThread* jthread = THREAD;
153 if (jthread->has_last_Java_frame()) {
154 vframeStream vfst(jthread);
155
156 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
157 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
158 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
159 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
160 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
161
162 Method* last_caller = NULL;
163
164 while (!vfst.at_end()) {
165 Method* m = vfst.method();
166 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
167 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
168 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
169 break;
170 }
171 last_caller = m;
172 vfst.next();
173 }
174 // if this is called from Class.forName0 and that is called from Class.forName,
175 // then print the caller of Class.forName. If this is Class.loadClass, then print
176 // that caller, otherwise keep quiet since this should be picked up elsewhere.
177 bool found_it = false;
178 if (!vfst.at_end() &&
179 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
180 vfst.method()->name() == vmSymbols::forName0_name()) {
181 vfst.next();
182 if (!vfst.at_end() &&
183 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
184 vfst.method()->name() == vmSymbols::forName_name()) {
185 vfst.next();
186 found_it = true;
187 }
188 } else if (last_caller != NULL &&
189 last_caller->method_holder()->name() ==
190 vmSymbols::java_lang_ClassLoader() &&
191 last_caller->name() == vmSymbols::loadClass_name()) {
192 found_it = true;
193 } else if (!vfst.at_end()) {
194 if (vfst.method()->is_native()) {
195 // JNI call
196 found_it = true;
197 }
198 }
199 if (found_it && !vfst.at_end()) {
200 // found the caller
201 caller = vfst.method()->method_holder();
202 line_number = vfst.method()->line_number_from_bci(vfst.bci());
203 if (line_number == -1) {
204 // show method name if it's a native method
205 trace = vfst.method()->name_and_sig_as_C_string();
206 }
207 Symbol* s = caller->source_file_name();
208 if (s != NULL) {
209 source_file = s->as_C_string();
210 }
211 }
212 }
213 if (caller != NULL) {
214 if (to_class != caller) {
215 const char * from = caller->external_name();
216 const char * to = to_class->external_name();
217 // print in a single call to reduce interleaving between threads
218 if (source_file != NULL) {
219 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
220 } else {
221 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
222 }
223 }
224 }
225 }
226
227 void trace_class_resolution(Klass* to_class) {
228 EXCEPTION_MARK;
229 trace_class_resolution_impl(to_class, THREAD);
230 if (HAS_PENDING_EXCEPTION) {
231 CLEAR_PENDING_EXCEPTION;
232 }
233 }
234
235 // java.lang.System //////////////////////////////////////////////////////////////////////
236
237
238 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
239 return os::javaTimeMillis();
240 JVM_END
241
242 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
243 return os::javaTimeNanos();
244 JVM_END
245
246 // The function below is actually exposed by jdk.internal.misc.VM and not
247 // java.lang.System, but we choose to keep it here so that it stays next
248 // to JVM_CurrentTimeMillis and JVM_NanoTime
249
250 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
251 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
252
253 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
254 jlong seconds;
255 jlong nanos;
256
257 os::javaTimeSystemUTC(seconds, nanos);
258
259 // We're going to verify that the result can fit in a long.
260 // For that we need the difference in seconds between 'seconds'
261 // and 'offset_secs' to be such that:
262 // |seconds - offset_secs| < (2^63/10^9)
263 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
264 // which makes |seconds - offset_secs| < 2^33
265 // and we will prefer +/- 2^32 as the maximum acceptable diff
266 // as 2^32 has a more natural feel than 2^33...
267 //
268 // So if |seconds - offset_secs| >= 2^32 - we return a special
269 // sentinel value (-1) which the caller should take as an
270 // exception value indicating that the offset given to us is
271 // too far from range of the current time - leading to too big
272 // a nano adjustment. The caller is expected to recover by
273 // computing a more accurate offset and calling this method
274 // again. (For the record 2^32 secs is ~136 years, so that
275 // should rarely happen)
276 //
277 jlong diff = seconds - offset_secs;
278 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
279 return -1; // sentinel value: the offset is too far off the target
280 }
281
282 // return the adjustment. If you compute a time by adding
283 // this number of nanoseconds along with the number of seconds
284 // in the offset you should get the current UTC time.
285 return (diff * (jlong)1000000000) + nanos;
286 JVM_END
287
288 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
289 jobject dst, jint dst_pos, jint length))
290 // Check if we have null pointers
291 if (src == NULL || dst == NULL) {
292 THROW(vmSymbols::java_lang_NullPointerException());
293 }
294 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
295 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
296 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
297 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
298 // Do copy
299 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
300 JVM_END
301
302
303 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
304 JavaValue r(T_OBJECT);
305 // public synchronized Object put(Object key, Object value);
306 HandleMark hm(THREAD);
307 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
308 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
309 JavaCalls::call_virtual(&r,
310 props,
311 vmClasses::Properties_klass(),
312 vmSymbols::put_name(),
313 vmSymbols::object_object_object_signature(),
314 key_str,
315 value_str,
316 THREAD);
317 }
318
319
320 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
321
322 /*
323 * Return all of the system properties in a Java String array with alternating
324 * names and values from the jvm SystemProperty.
325 * Which includes some internal and all commandline -D defined properties.
326 */
327 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
328 ResourceMark rm(THREAD);
329 HandleMark hm(THREAD);
330 int ndx = 0;
331 int fixedCount = 2;
332
333 SystemProperty* p = Arguments::system_properties();
334 int count = Arguments::PropertyList_count(p);
335
336 // Allocate result String array
337 InstanceKlass* ik = vmClasses::String_klass();
338 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
339 objArrayHandle result_h(THREAD, r);
340
341 while (p != NULL) {
342 const char * key = p->key();
343 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
344 const char * value = p->value();
345 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
346 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
347 result_h->obj_at_put(ndx * 2, key_str());
348 result_h->obj_at_put(ndx * 2 + 1, value_str());
349 ndx++;
350 }
351 p = p->next();
352 }
353
354 // Convert the -XX:MaxDirectMemorySize= command line flag
355 // to the sun.nio.MaxDirectMemorySize property.
356 // Do this after setting user properties to prevent people
357 // from setting the value with a -D option, as requested.
358 // Leave empty if not supplied
359 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
360 char as_chars[256];
361 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
362 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
363 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
364 result_h->obj_at_put(ndx * 2, key_str());
365 result_h->obj_at_put(ndx * 2 + 1, value_str());
366 ndx++;
367 }
368
369 // JVM monitoring and management support
370 // Add the sun.management.compiler property for the compiler's name
371 {
372 #undef CSIZE
373 #if defined(_LP64) || defined(_WIN64)
374 #define CSIZE "64-Bit "
375 #else
376 #define CSIZE
377 #endif // 64bit
378
379 #if COMPILER1_AND_COMPILER2
380 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
381 #else
382 #if defined(COMPILER1)
383 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
384 #elif defined(COMPILER2)
385 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
386 #elif INCLUDE_JVMCI
387 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
388 #else
389 const char* compiler_name = "";
390 #endif // compilers
391 #endif // COMPILER1_AND_COMPILER2
392
393 if (*compiler_name != '\0' &&
394 (Arguments::mode() != Arguments::_int)) {
395 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
396 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
397 result_h->obj_at_put(ndx * 2, key_str());
398 result_h->obj_at_put(ndx * 2 + 1, value_str());
399 ndx++;
400 }
401 }
402
403 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
404 JVM_END
405
406
407 /*
408 * Return the temporary directory that the VM uses for the attach
409 * and perf data files.
410 *
411 * It is important that this directory is well-known and the
412 * same for all VM instances. It cannot be affected by configuration
413 * variables such as java.io.tmpdir.
414 */
415 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
416 HandleMark hm(THREAD);
417 const char* temp_dir = os::get_temp_directory();
418 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
419 return (jstring) JNIHandles::make_local(THREAD, h());
420 JVM_END
421
422
423 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
424
425 extern volatile jint vm_created;
426
427 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
428 #if INCLUDE_CDS
429 // Link all classes for dynamic CDS dumping before vm exit.
430 if (DynamicArchive::should_dump_at_vm_exit()) {
431 DynamicArchive::prepare_for_dump_at_exit();
432 }
433 #endif
434 EventShutdown event;
435 if (event.should_commit()) {
436 event.set_reason("Shutdown requested from Java");
437 event.commit();
438 }
439 JVM_END
440
441
442 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
443 before_exit(thread);
444 vm_exit(code);
445 JVM_END
446
447
448 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
449 if (!DisableExplicitGC) {
450 EventSystemGC event;
451 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
452 Universe::heap()->collect(GCCause::_java_lang_system_gc);
453 event.commit();
454 }
455 JVM_END
456
457
458 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
459 return Universe::heap()->millis_since_last_whole_heap_examined();
460 JVM_END
461
462
463 static inline jlong convert_size_t_to_jlong(size_t val) {
464 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
465 NOT_LP64 (return (jlong)val;)
466 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
467 }
468
469 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
470 size_t n = Universe::heap()->capacity();
471 return convert_size_t_to_jlong(n);
472 JVM_END
473
474
475 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
476 size_t n = Universe::heap()->unused();
477 return convert_size_t_to_jlong(n);
478 JVM_END
479
480
481 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
482 size_t n = Universe::heap()->max_capacity();
483 return convert_size_t_to_jlong(n);
484 JVM_END
485
486
487 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
488 return os::active_processor_count();
489 JVM_END
490
491 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
492 #ifdef LINUX
493 if (UseContainerSupport) {
494 return JNI_TRUE;
495 }
496 #endif
497 return JNI_FALSE;
498 JVM_END
499
500 // java.lang.Throwable //////////////////////////////////////////////////////
501
502 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
503 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
504 java_lang_Throwable::fill_in_stack_trace(exception);
505 JVM_END
506
507 // java.lang.NullPointerException ///////////////////////////////////////////
508
509 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
510 if (!ShowCodeDetailsInExceptionMessages) return NULL;
511
512 oop exc = JNIHandles::resolve_non_null(throwable);
513
514 Method* method;
515 int bci;
516 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
517 return NULL;
518 }
519 if (method->is_native()) {
520 return NULL;
521 }
522
523 stringStream ss;
524 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
525 if (ok) {
526 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
527 return (jstring) JNIHandles::make_local(THREAD, result);
528 } else {
529 return NULL;
530 }
531 JVM_END
532
533 // java.lang.StackTraceElement //////////////////////////////////////////////
534
535
536 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject throwable))
537 Handle exception(THREAD, JNIHandles::resolve(throwable));
538 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
539 objArrayHandle stack_trace(THREAD, st);
540 // Fill in the allocated stack trace
541 java_lang_Throwable::get_stack_trace_elements(exception, stack_trace, CHECK);
542 JVM_END
543
544
545 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
546 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
547 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
548 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
549 JVM_END
550
551
552 // java.lang.StackWalker //////////////////////////////////////////////////////
553
554
555 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
556 jint skip_frames, jint frame_count, jint start_index,
557 jobjectArray frames))
558 if (!thread->has_last_Java_frame()) {
559 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
560 }
561
562 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
563
564 // frames array is a Class<?>[] array when only getting caller reference,
565 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
566 // be null.
567 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
568 objArrayHandle frames_array_h(THREAD, fa);
569
570 int limit = start_index + frame_count;
571 if (frames_array_h->length() < limit) {
572 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
573 }
574
575 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, frame_count,
576 start_index, frames_array_h, CHECK_NULL);
577 return JNIHandles::make_local(THREAD, result);
578 JVM_END
579
580
581 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
582 jint frame_count, jint start_index,
583 jobjectArray frames))
584 // frames array is a Class<?>[] array when only getting caller reference,
585 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
586 // be null.
587 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
588 objArrayHandle frames_array_h(THREAD, fa);
589
590 int limit = start_index+frame_count;
591 if (frames_array_h->length() < limit) {
592 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
593 }
594
595 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
596 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
597 start_index, frames_array_h, THREAD);
598 JVM_END
599
600 // java.lang.Object ///////////////////////////////////////////////
601
602
603 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
604 // as implemented in the classic virtual machine; return 0 if object is NULL
605 if (handle == NULL) {
606 return 0;
607 }
608 oop obj = JNIHandles::resolve_non_null(handle);
609 if (EnableValhalla && obj->klass()->is_inline_klass()) {
610 JavaValue result(T_INT);
611 JavaCallArguments args;
612 Handle ho(THREAD, obj);
613 args.push_oop(ho);
614 methodHandle method(THREAD, Universe::primitive_type_hash_code_method());
615 JavaCalls::call(&result, method, &args, THREAD);
616 if (HAS_PENDING_EXCEPTION) {
617 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
618 Handle e(THREAD, PENDING_EXCEPTION);
619 CLEAR_PENDING_EXCEPTION;
620 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
621 }
622 }
623 return result.get_jint();
624 } else {
625 return ObjectSynchronizer::FastHashCode(THREAD, obj);
626 }
627 JVM_END
628
629
630 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
631 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
632 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
633 if (JvmtiExport::should_post_monitor_wait()) {
634 JvmtiExport::post_monitor_wait(thread, obj(), ms);
635
636 // The current thread already owns the monitor and it has not yet
637 // been added to the wait queue so the current thread cannot be
638 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
639 // event handler cannot accidentally consume an unpark() meant for
640 // the ParkEvent associated with this ObjectMonitor.
641 }
642 ObjectSynchronizer::wait(obj, ms, CHECK);
643 JVM_END
644
645
646 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
647 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
648 ObjectSynchronizer::notify(obj, CHECK);
649 JVM_END
650
651
652 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
653 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
654 ObjectSynchronizer::notifyall(obj, CHECK);
655 JVM_END
656
657
658 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
659 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
660 Klass* klass = obj->klass();
661 JvmtiVMObjectAllocEventCollector oam;
662
663 #ifdef ASSERT
664 // Just checking that the cloneable flag is set correct
665 if (obj->is_array()) {
666 guarantee(klass->is_cloneable(), "all arrays are cloneable");
667 } else {
668 guarantee(obj->is_instance(), "should be instanceOop");
669 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
670 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
671 }
672 #endif
673
674 // Check if class of obj supports the Cloneable interface.
675 // All arrays are considered to be cloneable (See JLS 20.1.5).
676 // All j.l.r.Reference classes are considered non-cloneable.
677 if (!klass->is_cloneable() ||
678 klass->is_inline_klass() ||
679 (klass->is_instance_klass() &&
680 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
681 ResourceMark rm(THREAD);
682 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
683 }
684
685 // Make shallow object copy
686 const size_t size = obj->size();
687 oop new_obj_oop = NULL;
688 if (obj->is_array()) {
689 const int length = ((arrayOop)obj())->length();
690 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
691 /* do_zero */ true, CHECK_NULL);
692 } else {
693 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
694 }
695
696 HeapAccess<>::clone(obj(), new_obj_oop, size);
697
698 Handle new_obj(THREAD, new_obj_oop);
699 // Caution: this involves a java upcall, so the clone should be
700 // "gc-robust" by this stage.
701 if (klass->has_finalizer()) {
702 assert(obj->is_instance(), "should be instanceOop");
703 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
704 new_obj = Handle(THREAD, new_obj_oop);
705 }
706
707 return JNIHandles::make_local(THREAD, new_obj());
708 JVM_END
709
710 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
711
712 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
713 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
714 JVM_END
715
716 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
717 return InstanceKlass::is_finalization_enabled();
718 JVM_END
719
720 // java.io.File ///////////////////////////////////////////////////////////////
721
722 JVM_LEAF(char*, JVM_NativePath(char* path))
723 return os::native_path(path);
724 JVM_END
725
726
727 // Misc. class handling ///////////////////////////////////////////////////////////
728
729
730 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
731 // Getting the class of the caller frame.
732 //
733 // The call stack at this point looks something like this:
734 //
735 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
736 // [1] [ @CallerSensitive API.method ]
737 // [.] [ (skipped intermediate frames) ]
738 // [n] [ caller ]
739 vframeStream vfst(thread);
740 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
741 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
742 Method* m = vfst.method();
743 assert(m != NULL, "sanity");
744 switch (n) {
745 case 0:
746 // This must only be called from Reflection.getCallerClass
747 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
748 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
749 }
750 // fall-through
751 case 1:
752 // Frame 0 and 1 must be caller sensitive.
753 if (!m->caller_sensitive()) {
754 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
755 }
756 break;
757 default:
758 if (!m->is_ignored_by_security_stack_walk()) {
759 // We have reached the desired frame; return the holder class.
760 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
761 }
762 break;
763 }
764 }
765 return NULL;
766 JVM_END
767
768
769 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
770 oop mirror = NULL;
771 BasicType t = name2type(utf);
772 if (t != T_ILLEGAL && !is_reference_type(t)) {
773 mirror = Universe::java_mirror(t);
774 }
775 if (mirror == NULL) {
776 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
777 } else {
778 return (jclass) JNIHandles::make_local(THREAD, mirror);
779 }
780 JVM_END
781
782
783 // Returns a class loaded by the bootstrap class loader; or null
784 // if not found. ClassNotFoundException is not thrown.
785 // FindClassFromBootLoader is exported to the launcher for windows.
786 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
787 const char* name))
788 // Java libraries should ensure that name is never null or illegal.
789 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
790 // It's impossible to create this class; the name cannot fit
791 // into the constant pool.
792 return NULL;
793 }
794 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
795
796 TempNewSymbol h_name = SymbolTable::new_symbol(name);
797 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
798 if (k == NULL) {
799 return NULL;
800 }
801
802 if (log_is_enabled(Debug, class, resolve)) {
803 trace_class_resolution(k);
804 }
805 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
806 JVM_END
807
808 // Find a class with this name in this loader, using the caller's protection domain.
809 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
810 jboolean init, jobject loader,
811 jclass caller))
812 TempNewSymbol h_name =
813 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
814 CHECK_NULL);
815
816 oop loader_oop = JNIHandles::resolve(loader);
817 oop from_class = JNIHandles::resolve(caller);
818 oop protection_domain = NULL;
819 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
820 // NPE. Put it in another way, the bootstrap class loader has all permission and
821 // thus no checkPackageAccess equivalence in the VM class loader.
822 // The caller is also passed as NULL by the java code if there is no security
823 // manager to avoid the performance cost of getting the calling class.
824 if (from_class != NULL && loader_oop != NULL) {
825 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
826 }
827
828 Handle h_loader(THREAD, loader_oop);
829 Handle h_prot(THREAD, protection_domain);
830 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
831 h_prot, false, THREAD);
832
833 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
834 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
835 }
836 return result;
837 JVM_END
838
839 // Currently only called from the old verifier.
840 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
841 jboolean init, jclass from))
842 TempNewSymbol h_name =
843 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
844 CHECK_NULL);
845 oop from_class_oop = JNIHandles::resolve(from);
846 Klass* from_class = (from_class_oop == NULL)
847 ? (Klass*)NULL
848 : java_lang_Class::as_Klass(from_class_oop);
849 oop class_loader = NULL;
850 oop protection_domain = NULL;
851 if (from_class != NULL) {
852 class_loader = from_class->class_loader();
853 protection_domain = from_class->protection_domain();
854 }
855 Handle h_loader(THREAD, class_loader);
856 Handle h_prot (THREAD, protection_domain);
857 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
858 h_prot, true, thread);
859
860 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
861 // this function is generally only used for class loading during verification.
862 ResourceMark rm;
863 oop from_mirror = JNIHandles::resolve_non_null(from);
864 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
865 const char * from_name = from_class->external_name();
866
867 oop mirror = JNIHandles::resolve_non_null(result);
868 Klass* to_class = java_lang_Class::as_Klass(mirror);
869 const char * to = to_class->external_name();
870 log_debug(class, resolve)("%s %s (verification)", from_name, to);
871 }
872
873 return result;
874 JVM_END
875
876 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
877 static jclass jvm_define_class_common(const char *name,
878 jobject loader, const jbyte *buf,
879 jsize len, jobject pd, const char *source,
880 TRAPS) {
881 if (source == NULL) source = "__JVM_DefineClass__";
882
883 JavaThread* jt = THREAD;
884
885 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
886 ClassLoader::perf_define_appclass_selftime(),
887 ClassLoader::perf_define_appclasses(),
888 jt->get_thread_stat()->perf_recursion_counts_addr(),
889 jt->get_thread_stat()->perf_timers_addr(),
890 PerfClassTraceTime::DEFINE_CLASS);
891
892 if (UsePerfData) {
893 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
894 }
895
896 // Class resolution will get the class name from the .class stream if the name is null.
897 TempNewSymbol class_name = name == NULL ? NULL :
898 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
899 CHECK_NULL);
900
901 ResourceMark rm(THREAD);
902 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
903 Handle class_loader (THREAD, JNIHandles::resolve(loader));
904 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
905 ClassLoadInfo cl_info(protection_domain);
906 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
907 class_loader,
908 cl_info,
909 CHECK_NULL);
910
911 if (log_is_enabled(Debug, class, resolve)) {
912 trace_class_resolution(k);
913 }
914
915 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
916 }
917
918 enum {
919 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
920 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
921 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
922 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
923 };
924
925 /*
926 * Define a class with the specified flags that indicates if it's a nestmate,
927 * hidden, or strongly referenced from class loader.
928 */
929 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
930 const jbyte *buf, jsize len, jobject pd,
931 jboolean init, int flags, jobject classData, TRAPS) {
932 ResourceMark rm(THREAD);
933
934 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
935 // Lookup class must be a non-null instance
936 if (lookup_k == NULL) {
937 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
938 }
939 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
940
941 Handle class_loader (THREAD, lookup_k->class_loader());
942
943 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
944 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
945 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
946 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
947
948 InstanceKlass* host_class = NULL;
949 if (is_nestmate) {
950 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
951 }
952
953 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
954 name,
955 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
956 is_nestmate ? host_class->external_name() : "",
957 is_hidden ? "hidden" : "not hidden",
958 is_strong ? "strong" : "weak",
959 vm_annotations ? "with vm annotations" : "without vm annotation");
960
961 if (!is_hidden) {
962 // classData is only applicable for hidden classes
963 if (classData != NULL) {
964 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
965 }
966 if (is_nestmate) {
967 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
968 }
969 if (!is_strong) {
970 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
971 }
972 if (vm_annotations) {
973 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
974 }
975 if (flags != STRONG_LOADER_LINK) {
976 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
977 err_msg("invalid flag 0x%x", flags));
978 }
979 }
980
981 // Class resolution will get the class name from the .class stream if the name is null.
982 TempNewSymbol class_name = name == NULL ? NULL :
983 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
984 CHECK_NULL);
985
986 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
987 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
988 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
989
990 InstanceKlass* ik = NULL;
991 if (!is_hidden) {
992 ClassLoadInfo cl_info(protection_domain);
993 ik = SystemDictionary::resolve_from_stream(&st, class_name,
994 class_loader,
995 cl_info,
996 CHECK_NULL);
997
998 if (log_is_enabled(Debug, class, resolve)) {
999 trace_class_resolution(ik);
1000 }
1001 } else { // hidden
1002 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1003 ClassLoadInfo cl_info(protection_domain,
1004 host_class,
1005 classData_h,
1006 is_hidden,
1007 is_strong,
1008 vm_annotations);
1009 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1010 class_loader,
1011 cl_info,
1012 CHECK_NULL);
1013
1014 // The hidden class loader data has been artificially been kept alive to
1015 // this point. The mirror and any instances of this class have to keep
1016 // it alive afterwards.
1017 ik->class_loader_data()->dec_keep_alive();
1018
1019 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1020 ModuleEntry* module = ik->module();
1021 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1022 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1023 module_name,
1024 ik->external_name(),
1025 host_class->external_name(),
1026 ik->is_hidden() ? "is hidden" : "is not hidden");
1027 }
1028 }
1029 assert(Reflection::is_same_class_package(lookup_k, ik),
1030 "lookup class and defined class are in different packages");
1031
1032 if (init) {
1033 ik->initialize(CHECK_NULL);
1034 } else {
1035 ik->link_class(CHECK_NULL);
1036 }
1037
1038 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1039 }
1040
1041 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1042 return jvm_define_class_common(name, loader, buf, len, pd, NULL, THREAD);
1043 JVM_END
1044
1045 /*
1046 * Define a class with the specified lookup class.
1047 * lookup: Lookup class
1048 * name: the name of the class
1049 * buf: class bytes
1050 * len: length of class bytes
1051 * pd: protection domain
1052 * init: initialize the class
1053 * flags: properties of the class
1054 * classData: private static pre-initialized field
1055 */
1056 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1057 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1058
1059 if (lookup == NULL) {
1060 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1061 }
1062
1063 assert(buf != NULL, "buf must not be NULL");
1064
1065 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1066 JVM_END
1067
1068 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1069
1070 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1071 JVM_END
1072
1073 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1074 ResourceMark rm(THREAD);
1075
1076 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1077 char* str = java_lang_String::as_utf8_string(h_name());
1078
1079 // Sanity check, don't expect null
1080 if (str == NULL) return NULL;
1081
1082 // Internalize the string, converting '.' to '/' in string.
1083 char* p = (char*)str;
1084 while (*p != '\0') {
1085 if (*p == '.') {
1086 *p = '/';
1087 }
1088 p++;
1089 }
1090
1091 const int str_len = (int)(p - str);
1092 if (str_len > Symbol::max_length()) {
1093 // It's impossible to create this class; the name cannot fit
1094 // into the constant pool.
1095 return NULL;
1096 }
1097 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1098
1099 // Security Note:
1100 // The Java level wrapper will perform the necessary security check allowing
1101 // us to pass the NULL as the initiating class loader.
1102 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1103 Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1104 h_loader,
1105 Handle());
1106 #if INCLUDE_CDS
1107 if (k == NULL) {
1108 // If the class is not already loaded, try to see if it's in the shared
1109 // archive for the current classloader (h_loader).
1110 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1111 }
1112 #endif
1113 return (k == NULL) ? NULL :
1114 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1115 JVM_END
1116
1117 // Module support //////////////////////////////////////////////////////////////////////////////
1118
1119 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1120 jstring location, jobjectArray packages))
1121 Handle h_module (THREAD, JNIHandles::resolve(module));
1122 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1123 JVM_END
1124
1125 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1126 Handle h_module (THREAD, JNIHandles::resolve(module));
1127 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1128 JVM_END
1129
1130 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1131 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1132 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1133 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1134 JVM_END
1135
1136 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1137 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1138 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1139 JVM_END
1140
1141 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1142 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1143 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1144 JVM_END
1145
1146 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1147 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1148 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1149 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1150 JVM_END
1151
1152 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1153 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1154 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1155 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1156 JVM_END
1157
1158 // Reflection support //////////////////////////////////////////////////////////////////////////////
1159
1160 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1161 assert (cls != NULL, "illegal class");
1162 JvmtiVMObjectAllocEventCollector oam;
1163 ResourceMark rm(THREAD);
1164 HandleMark hm(THREAD);
1165 Handle java_class(THREAD, JNIHandles::resolve(cls));
1166 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1167 return (jstring) JNIHandles::make_local(THREAD, result);
1168 JVM_END
1169
1170
1171 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1172 JvmtiVMObjectAllocEventCollector oam;
1173 oop mirror = JNIHandles::resolve_non_null(cls);
1174
1175 // Special handling for primitive objects
1176 if (java_lang_Class::is_primitive(mirror)) {
1177 // Primitive objects does not have any interfaces
1178 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1179 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1180 }
1181
1182 Klass* klass = java_lang_Class::as_Klass(mirror);
1183 // Figure size of result array
1184 int size;
1185 if (klass->is_instance_klass()) {
1186 InstanceKlass* ik = InstanceKlass::cast(klass);
1187 size = ik->local_interfaces()->length();
1188 } else {
1189 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass");
1190 size = 2;
1191 }
1192
1193 // Allocate result array
1194 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1195 objArrayHandle result (THREAD, r);
1196 // Fill in result
1197 if (klass->is_instance_klass()) {
1198 // Regular instance klass, fill in all local interfaces
1199 for (int index = 0; index < size; index++) {
1200 InstanceKlass* ik = InstanceKlass::cast(klass);
1201 Klass* k = ik->local_interfaces()->at(index);
1202 result->obj_at_put(index, k->java_mirror());
1203 }
1204 } else {
1205 // All arrays implement java.lang.Cloneable and java.io.Serializable
1206 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1207 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1208 }
1209 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1210 JVM_END
1211
1212
1213 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1214 oop mirror = JNIHandles::resolve_non_null(cls);
1215 if (java_lang_Class::is_primitive(mirror)) {
1216 return JNI_FALSE;
1217 }
1218 Klass* k = java_lang_Class::as_Klass(mirror);
1219 jboolean result = k->is_interface();
1220 assert(!result || k->is_instance_klass(),
1221 "all interfaces are instance types");
1222 // The compiler intrinsic for isInterface tests the
1223 // Klass::_access_flags bits in the same way.
1224 return result;
1225 JVM_END
1226
1227 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1228 oop mirror = JNIHandles::resolve_non_null(cls);
1229 if (java_lang_Class::is_primitive(mirror)) {
1230 return JNI_FALSE;
1231 }
1232 Klass* k = java_lang_Class::as_Klass(mirror);
1233 return k->is_hidden();
1234 JVM_END
1235
1236 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1237 JvmtiVMObjectAllocEventCollector oam;
1238 oop mirror = JNIHandles::resolve_non_null(cls);
1239 if (java_lang_Class::is_primitive(mirror)) {
1240 // There are no signers for primitive types
1241 return NULL;
1242 }
1243
1244 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1245
1246 // If there are no signers set in the class, or if the class
1247 // is an array, return NULL.
1248 if (signers == NULL) return NULL;
1249
1250 // copy of the signers array
1251 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1252 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1253 for (int index = 0; index < signers->length(); index++) {
1254 signers_copy->obj_at_put(index, signers->obj_at(index));
1255 }
1256
1257 // return the copy
1258 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1259 JVM_END
1260
1261
1262 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1263 oop mirror = JNIHandles::resolve_non_null(cls);
1264 if (!java_lang_Class::is_primitive(mirror)) {
1265 // This call is ignored for primitive types and arrays.
1266 // Signers are only set once, ClassLoader.java, and thus shouldn't
1267 // be called with an array. Only the bootstrap loader creates arrays.
1268 Klass* k = java_lang_Class::as_Klass(mirror);
1269 if (k->is_instance_klass()) {
1270 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1271 }
1272 }
1273 JVM_END
1274
1275
1276 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1277 oop mirror = JNIHandles::resolve_non_null(cls);
1278 if (mirror == NULL) {
1279 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1280 }
1281
1282 if (java_lang_Class::is_primitive(mirror)) {
1283 // Primitive types does not have a protection domain.
1284 return NULL;
1285 }
1286
1287 oop pd = java_lang_Class::protection_domain(mirror);
1288 return (jobject) JNIHandles::make_local(THREAD, pd);
1289 JVM_END
1290
1291
1292 // Returns the inherited_access_control_context field of the running thread.
1293 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1294 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1295 return JNIHandles::make_local(THREAD, result);
1296 JVM_END
1297
1298 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1299 if (!UsePrivilegedStack) return NULL;
1300
1301 ResourceMark rm(THREAD);
1302 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1303 JvmtiVMObjectAllocEventCollector oam;
1304
1305 // count the protection domains on the execution stack. We collapse
1306 // duplicate consecutive protection domains into a single one, as
1307 // well as stopping when we hit a privileged frame.
1308
1309 oop previous_protection_domain = NULL;
1310 Handle privileged_context(thread, NULL);
1311 bool is_privileged = false;
1312 oop protection_domain = NULL;
1313
1314 // Iterate through Java frames
1315 vframeStream vfst(thread);
1316 for(; !vfst.at_end(); vfst.next()) {
1317 // get method of frame
1318 Method* method = vfst.method();
1319
1320 // stop at the first privileged frame
1321 if (method->method_holder() == vmClasses::AccessController_klass() &&
1322 method->name() == vmSymbols::executePrivileged_name())
1323 {
1324 // this frame is privileged
1325 is_privileged = true;
1326
1327 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1328
1329 StackValueCollection* locals = priv->locals();
1330 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1331 StackValue* clr_sv = locals->at(2); // Class<?> caller
1332 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1333 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1334 privileged_context = ctx_sv->get_obj();
1335 Handle caller = clr_sv->get_obj();
1336
1337 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1338 protection_domain = caller_klass->protection_domain();
1339 } else {
1340 protection_domain = method->method_holder()->protection_domain();
1341 }
1342
1343 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1344 local_array->push(Handle(thread, protection_domain));
1345 previous_protection_domain = protection_domain;
1346 }
1347
1348 if (is_privileged) break;
1349 }
1350
1351
1352 // either all the domains on the stack were system domains, or
1353 // we had a privileged system domain
1354 if (local_array->is_empty()) {
1355 if (is_privileged && privileged_context.is_null()) return NULL;
1356
1357 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1358 return JNIHandles::make_local(THREAD, result);
1359 }
1360
1361 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1362 local_array->length(), CHECK_NULL);
1363 objArrayHandle h_context(thread, context);
1364 for (int index = 0; index < local_array->length(); index++) {
1365 h_context->obj_at_put(index, local_array->at(index)());
1366 }
1367
1368 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1369
1370 return JNIHandles::make_local(THREAD, result);
1371 JVM_END
1372
1373
1374 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1375 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1376 return (k != NULL) && k->is_array_klass() ? true : false;
1377 JVM_END
1378
1379
1380 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1381 oop mirror = JNIHandles::resolve_non_null(cls);
1382 return (jboolean) java_lang_Class::is_primitive(mirror);
1383 JVM_END
1384
1385
1386 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1387 oop mirror = JNIHandles::resolve_non_null(cls);
1388 if (java_lang_Class::is_primitive(mirror)) {
1389 // Primitive type
1390 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1391 }
1392
1393 Klass* k = java_lang_Class::as_Klass(mirror);
1394 debug_only(int computed_modifiers = k->compute_modifier_flags());
1395 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1396 return k->modifier_flags();
1397 JVM_END
1398
1399
1400 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1401
1402 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1403 JvmtiVMObjectAllocEventCollector oam;
1404 // ofClass is a reference to a java_lang_Class object. The mirror object
1405 // of an InstanceKlass
1406 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1407 if (java_lang_Class::is_primitive(ofMirror) ||
1408 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1409 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1410 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1411 }
1412
1413 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1414 InnerClassesIterator iter(k);
1415
1416 if (iter.length() == 0) {
1417 // Neither an inner nor outer class
1418 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1419 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1420 }
1421
1422 // find inner class info
1423 constantPoolHandle cp(thread, k->constants());
1424 int length = iter.length();
1425
1426 // Allocate temp. result array
1427 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1428 objArrayHandle result (THREAD, r);
1429 int members = 0;
1430
1431 for (; !iter.done(); iter.next()) {
1432 int ioff = iter.inner_class_info_index();
1433 int ooff = iter.outer_class_info_index();
1434
1435 if (ioff != 0 && ooff != 0) {
1436 // Check to see if the name matches the class we're looking for
1437 // before attempting to find the class.
1438 if (cp->klass_name_at_matches(k, ooff)) {
1439 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1440 if (outer_klass == k) {
1441 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1442 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1443
1444 // Throws an exception if outer klass has not declared k as
1445 // an inner klass
1446 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1447
1448 result->obj_at_put(members, inner_klass->java_mirror());
1449 members++;
1450 }
1451 }
1452 }
1453 }
1454
1455 if (members != length) {
1456 // Return array of right length
1457 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1458 for(int i = 0; i < members; i++) {
1459 res->obj_at_put(i, result->obj_at(i));
1460 }
1461 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1462 }
1463
1464 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1465 JVM_END
1466
1467
1468 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1469 {
1470 // ofClass is a reference to a java_lang_Class object.
1471 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1472 if (java_lang_Class::is_primitive(ofMirror)) {
1473 return NULL;
1474 }
1475 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1476 if (!klass->is_instance_klass()) {
1477 return NULL;
1478 }
1479
1480 bool inner_is_member = false;
1481 Klass* outer_klass
1482 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1483 if (outer_klass == NULL) return NULL; // already a top-level class
1484 if (!inner_is_member) return NULL; // a hidden class (inside a method)
1485 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1486 }
1487 JVM_END
1488
1489 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1490 {
1491 oop mirror = JNIHandles::resolve_non_null(cls);
1492 if (java_lang_Class::is_primitive(mirror)) {
1493 return NULL;
1494 }
1495 Klass* klass = java_lang_Class::as_Klass(mirror);
1496 if (!klass->is_instance_klass()) {
1497 return NULL;
1498 }
1499 InstanceKlass* k = InstanceKlass::cast(klass);
1500 int ooff = 0, noff = 0;
1501 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1502 if (noff != 0) {
1503 constantPoolHandle i_cp(thread, k->constants());
1504 Symbol* name = i_cp->symbol_at(noff);
1505 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1506 return (jstring) JNIHandles::make_local(THREAD, str());
1507 }
1508 }
1509 return NULL;
1510 }
1511 JVM_END
1512
1513 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1514 assert (cls != NULL, "illegal class");
1515 JvmtiVMObjectAllocEventCollector oam;
1516 ResourceMark rm(THREAD);
1517 oop mirror = JNIHandles::resolve_non_null(cls);
1518 // Return null for arrays and primatives
1519 if (!java_lang_Class::is_primitive(mirror)) {
1520 Klass* k = java_lang_Class::as_Klass(mirror);
1521 if (k->is_instance_klass()) {
1522 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1523 if (sym == NULL) return NULL;
1524 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1525 return (jstring) JNIHandles::make_local(THREAD, str());
1526 }
1527 }
1528 return NULL;
1529 JVM_END
1530
1531
1532 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1533 assert (cls != NULL, "illegal class");
1534 oop mirror = JNIHandles::resolve_non_null(cls);
1535 // Return null for arrays and primitives
1536 if (!java_lang_Class::is_primitive(mirror)) {
1537 Klass* k = java_lang_Class::as_Klass(mirror);
1538 if (k->is_instance_klass()) {
1539 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1540 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1541 }
1542 }
1543 return NULL;
1544 JVM_END
1545
1546
1547 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1548 // some of this code was adapted from from jni_FromReflectedField
1549
1550 oop reflected = JNIHandles::resolve_non_null(field);
1551 oop mirror = java_lang_reflect_Field::clazz(reflected);
1552 Klass* k = java_lang_Class::as_Klass(mirror);
1553 int slot = java_lang_reflect_Field::slot(reflected);
1554 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1555
1556 InstanceKlass* ik = InstanceKlass::cast(k);
1557 intptr_t offset = ik->field_offset(slot);
1558
1559 if (modifiers & JVM_ACC_STATIC) {
1560 // for static fields we only look in the current class
1561 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1562 assert(false, "cannot find static field");
1563 return false;
1564 }
1565 } else {
1566 // for instance fields we start with the current class and work
1567 // our way up through the superclass chain
1568 if (!ik->find_field_from_offset(offset, false, &fd)) {
1569 assert(false, "cannot find instance field");
1570 return false;
1571 }
1572 }
1573 return true;
1574 }
1575
1576 static Method* jvm_get_method_common(jobject method) {
1577 // some of this code was adapted from from jni_FromReflectedMethod
1578
1579 oop reflected = JNIHandles::resolve_non_null(method);
1580 oop mirror = NULL;
1581 int slot = 0;
1582
1583 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1584 mirror = java_lang_reflect_Constructor::clazz(reflected);
1585 slot = java_lang_reflect_Constructor::slot(reflected);
1586 } else {
1587 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1588 "wrong type");
1589 mirror = java_lang_reflect_Method::clazz(reflected);
1590 slot = java_lang_reflect_Method::slot(reflected);
1591 }
1592 Klass* k = java_lang_Class::as_Klass(mirror);
1593
1594 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1595 assert(m != NULL, "cannot find method");
1596 return m; // caller has to deal with NULL in product mode
1597 }
1598
1599 /* Type use annotations support (JDK 1.8) */
1600
1601 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1602 assert (cls != NULL, "illegal class");
1603 ResourceMark rm(THREAD);
1604 // Return null for arrays and primitives
1605 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1606 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1607 if (k->is_instance_klass()) {
1608 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1609 if (type_annotations != NULL) {
1610 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1611 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1612 }
1613 }
1614 }
1615 return NULL;
1616 JVM_END
1617
1618 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1619 assert (method != NULL, "illegal method");
1620 // method is a handle to a java.lang.reflect.Method object
1621 Method* m = jvm_get_method_common(method);
1622 if (m == NULL) {
1623 return NULL;
1624 }
1625
1626 AnnotationArray* type_annotations = m->type_annotations();
1627 if (type_annotations != NULL) {
1628 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1629 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1630 }
1631
1632 return NULL;
1633 JVM_END
1634
1635 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1636 assert (field != NULL, "illegal field");
1637 fieldDescriptor fd;
1638 bool gotFd = jvm_get_field_common(field, fd);
1639 if (!gotFd) {
1640 return NULL;
1641 }
1642
1643 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1644 JVM_END
1645
1646 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1647 if (!cp->is_within_bounds(index)) {
1648 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1649 }
1650 }
1651
1652 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1653 {
1654 // method is a handle to a java.lang.reflect.Method object
1655 Method* method_ptr = jvm_get_method_common(method);
1656 methodHandle mh (THREAD, method_ptr);
1657 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1658 const int num_params = mh->method_parameters_length();
1659
1660 if (num_params < 0) {
1661 // A -1 return value from method_parameters_length means there is no
1662 // parameter data. Return null to indicate this to the reflection
1663 // API.
1664 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1665 return (jobjectArray)NULL;
1666 } else {
1667 // Otherwise, we return something up to reflection, even if it is
1668 // a zero-length array. Why? Because in some cases this can
1669 // trigger a MalformedParametersException.
1670
1671 // make sure all the symbols are properly formatted
1672 for (int i = 0; i < num_params; i++) {
1673 MethodParametersElement* params = mh->method_parameters_start();
1674 int index = params[i].name_cp_index;
1675 constantPoolHandle cp(THREAD, mh->constants());
1676 bounds_check(cp, index, CHECK_NULL);
1677
1678 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1679 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1680 "Wrong type at constant pool index");
1681 }
1682
1683 }
1684
1685 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1686 objArrayHandle result (THREAD, result_oop);
1687
1688 for (int i = 0; i < num_params; i++) {
1689 MethodParametersElement* params = mh->method_parameters_start();
1690 // For a 0 index, give a NULL symbol
1691 Symbol* sym = 0 != params[i].name_cp_index ?
1692 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1693 int flags = params[i].flags;
1694 oop param = Reflection::new_parameter(reflected_method, i, sym,
1695 flags, CHECK_NULL);
1696 result->obj_at_put(i, param);
1697 }
1698 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1699 }
1700 }
1701 JVM_END
1702
1703 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1704
1705 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1706 {
1707 JvmtiVMObjectAllocEventCollector oam;
1708
1709 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1710 // Exclude primitive types and array types
1711 if (java_lang_Class::is_primitive(ofMirror) ||
1712 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1713 // Return empty array
1714 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1715 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1716 }
1717
1718 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1719 constantPoolHandle cp(THREAD, k->constants());
1720
1721 // Ensure class is linked
1722 k->link_class(CHECK_NULL);
1723
1724 // Allocate result
1725 int num_fields;
1726
1727 if (publicOnly) {
1728 num_fields = 0;
1729 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1730 if (fs.access_flags().is_public()) ++num_fields;
1731 }
1732 } else {
1733 num_fields = k->java_fields_count();
1734 }
1735
1736 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1737 objArrayHandle result (THREAD, r);
1738
1739 int out_idx = 0;
1740 fieldDescriptor fd;
1741 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1742 if (!publicOnly || fs.access_flags().is_public()) {
1743 fd.reinitialize(k, fs.index());
1744 oop field = Reflection::new_field(&fd, CHECK_NULL);
1745 result->obj_at_put(out_idx, field);
1746 ++out_idx;
1747 }
1748 }
1749 assert(out_idx == num_fields, "just checking");
1750 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1751 }
1752 JVM_END
1753
1754 // A class is a record if and only if it is final and a direct subclass of
1755 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1756 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1757 {
1758 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1759 if (k != NULL && k->is_instance_klass()) {
1760 InstanceKlass* ik = InstanceKlass::cast(k);
1761 return ik->is_record();
1762 } else {
1763 return false;
1764 }
1765 }
1766 JVM_END
1767
1768 // Returns an array containing the components of the Record attribute,
1769 // or NULL if the attribute is not present.
1770 //
1771 // Note that this function returns the components of the Record attribute
1772 // even if the class is not a record.
1773 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1774 {
1775 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1776 assert(c->is_instance_klass(), "must be");
1777 InstanceKlass* ik = InstanceKlass::cast(c);
1778
1779 Array<RecordComponent*>* components = ik->record_components();
1780 if (components != NULL) {
1781 JvmtiVMObjectAllocEventCollector oam;
1782 constantPoolHandle cp(THREAD, ik->constants());
1783 int length = components->length();
1784 assert(length >= 0, "unexpected record_components length");
1785 objArrayOop record_components =
1786 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1787 objArrayHandle components_h (THREAD, record_components);
1788
1789 for (int x = 0; x < length; x++) {
1790 RecordComponent* component = components->at(x);
1791 assert(component != NULL, "unexpected NULL record component");
1792 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1793 components_h->obj_at_put(x, component_oop);
1794 }
1795 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1796 }
1797
1798 return NULL;
1799 }
1800 JVM_END
1801
1802 static bool select_method(const methodHandle& method, bool want_constructor) {
1803 bool is_ctor = (method->is_object_constructor() ||
1804 method->is_static_init_factory());
1805 if (want_constructor) {
1806 return is_ctor;
1807 } else {
1808 return (!is_ctor &&
1809 !method->is_class_initializer() &&
1810 !method->is_overpass());
1811 }
1812 }
1813
1814 static jobjectArray get_class_declared_methods_helper(
1815 JNIEnv *env,
1816 jclass ofClass, jboolean publicOnly,
1817 bool want_constructor,
1818 Klass* klass, TRAPS) {
1819
1820 JvmtiVMObjectAllocEventCollector oam;
1821
1822 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1823 // Exclude primitive types and array types
1824 if (java_lang_Class::is_primitive(ofMirror)
1825 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1826 // Return empty array
1827 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1828 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1829 }
1830
1831 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1832
1833 // Ensure class is linked
1834 k->link_class(CHECK_NULL);
1835
1836 Array<Method*>* methods = k->methods();
1837 int methods_length = methods->length();
1838
1839 // Save original method_idnum in case of redefinition, which can change
1840 // the idnum of obsolete methods. The new method will have the same idnum
1841 // but if we refresh the methods array, the counts will be wrong.
1842 ResourceMark rm(THREAD);
1843 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1844 int num_methods = 0;
1845
1846 for (int i = 0; i < methods_length; i++) {
1847 methodHandle method(THREAD, methods->at(i));
1848 if (select_method(method, want_constructor)) {
1849 if (!publicOnly || method->is_public()) {
1850 idnums->push(method->method_idnum());
1851 ++num_methods;
1852 }
1853 }
1854 }
1855
1856 // Allocate result
1857 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1858 objArrayHandle result (THREAD, r);
1859
1860 // Now just put the methods that we selected above, but go by their idnum
1861 // in case of redefinition. The methods can be redefined at any safepoint,
1862 // so above when allocating the oop array and below when creating reflect
1863 // objects.
1864 for (int i = 0; i < num_methods; i++) {
1865 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1866 if (method.is_null()) {
1867 // Method may have been deleted and seems this API can handle null
1868 // Otherwise should probably put a method that throws NSME
1869 result->obj_at_put(i, NULL);
1870 } else {
1871 oop m;
1872 if (want_constructor) {
1873 assert(method->is_object_constructor() ||
1874 method->is_static_init_factory(), "must be");
1875 m = Reflection::new_constructor(method, CHECK_NULL);
1876 } else {
1877 m = Reflection::new_method(method, false, CHECK_NULL);
1878 }
1879 result->obj_at_put(i, m);
1880 }
1881 }
1882
1883 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1884 }
1885
1886 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1887 {
1888 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1889 /*want_constructor*/ false,
1890 vmClasses::reflect_Method_klass(), THREAD);
1891 }
1892 JVM_END
1893
1894 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1895 {
1896 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1897 /*want_constructor*/ true,
1898 vmClasses::reflect_Constructor_klass(), THREAD);
1899 }
1900 JVM_END
1901
1902 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1903 {
1904 oop mirror = JNIHandles::resolve_non_null(cls);
1905 if (java_lang_Class::is_primitive(mirror)) {
1906 // Primitive type
1907 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1908 }
1909
1910 Klass* k = java_lang_Class::as_Klass(mirror);
1911 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1912 }
1913 JVM_END
1914
1915 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1916 {
1917 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1918 assert(c->is_instance_klass(), "must be");
1919 InstanceKlass* ck = InstanceKlass::cast(c);
1920 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1921 assert(m->is_instance_klass(), "must be");
1922 InstanceKlass* mk = InstanceKlass::cast(m);
1923 return ck->has_nestmate_access_to(mk, THREAD);
1924 }
1925 JVM_END
1926
1927 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1928 {
1929 // current is not a primitive or array class
1930 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1931 assert(c->is_instance_klass(), "must be");
1932 InstanceKlass* ck = InstanceKlass::cast(c);
1933 InstanceKlass* host = ck->nest_host(THREAD);
1934 return (jclass) (host == NULL ? NULL :
1935 JNIHandles::make_local(THREAD, host->java_mirror()));
1936 }
1937 JVM_END
1938
1939 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1940 {
1941 // current is not a primitive or array class
1942 ResourceMark rm(THREAD);
1943 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1944 assert(c->is_instance_klass(), "must be");
1945 InstanceKlass* ck = InstanceKlass::cast(c);
1946 InstanceKlass* host = ck->nest_host(THREAD);
1947
1948 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1949 ck->external_name(), host->external_name());
1950 {
1951 JvmtiVMObjectAllocEventCollector oam;
1952 Array<u2>* members = host->nest_members();
1953 int length = members == NULL ? 0 : members->length();
1954
1955 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1956
1957 // nest host is first in the array so make it one bigger
1958 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1959 length + 1, CHECK_NULL);
1960 objArrayHandle result(THREAD, r);
1961 result->obj_at_put(0, host->java_mirror());
1962 if (length != 0) {
1963 int count = 0;
1964 for (int i = 0; i < length; i++) {
1965 int cp_index = members->at(i);
1966 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1967 if (HAS_PENDING_EXCEPTION) {
1968 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1969 return NULL; // propagate VMEs
1970 }
1971 if (log_is_enabled(Trace, class, nestmates)) {
1972 stringStream ss;
1973 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1974 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1975 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1976 log_trace(class, nestmates)("%s", ss.as_string());
1977 }
1978 CLEAR_PENDING_EXCEPTION;
1979 continue;
1980 }
1981 if (k->is_instance_klass()) {
1982 InstanceKlass* ik = InstanceKlass::cast(k);
1983 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1984 if (nest_host_k == host) {
1985 result->obj_at_put(count+1, k->java_mirror());
1986 count++;
1987 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1988 } else {
1989 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1990 ik->external_name(), nest_host_k->external_name());
1991 }
1992 } else {
1993 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1994 k->external_name());
1995 }
1996 }
1997 if (count < length) {
1998 // we had invalid entries so we need to compact the array
1999 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2000 length + 1, count + 1);
2001
2002 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2003 count + 1, CHECK_NULL);
2004 objArrayHandle result2(THREAD, r2);
2005 for (int i = 0; i < count + 1; i++) {
2006 result2->obj_at_put(i, result->obj_at(i));
2007 }
2008 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2009 }
2010 }
2011 else {
2012 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2013 }
2014 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2015 }
2016 }
2017 JVM_END
2018
2019 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2020 {
2021 oop mirror = JNIHandles::resolve_non_null(current);
2022 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2023 Klass* c = java_lang_Class::as_Klass(mirror);
2024 assert(c->is_instance_klass(), "must be");
2025 InstanceKlass* ik = InstanceKlass::cast(c);
2026 ResourceMark rm(THREAD);
2027 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2028 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2029 if (ik->is_sealed()) {
2030 JvmtiVMObjectAllocEventCollector oam;
2031 Array<u2>* subclasses = ik->permitted_subclasses();
2032 int length = subclasses->length();
2033
2034 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2035
2036 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2037 length, CHECK_NULL);
2038 objArrayHandle result(THREAD, r);
2039 int count = 0;
2040 for (int i = 0; i < length; i++) {
2041 int cp_index = subclasses->at(i);
2042 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2043 if (HAS_PENDING_EXCEPTION) {
2044 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2045 return NULL; // propagate VMEs
2046 }
2047 if (log_is_enabled(Trace, class, sealed)) {
2048 stringStream ss;
2049 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2050 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2051 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2052 log_trace(class, sealed)("%s", ss.as_string());
2053 }
2054
2055 CLEAR_PENDING_EXCEPTION;
2056 continue;
2057 }
2058 if (k->is_instance_klass()) {
2059 result->obj_at_put(count++, k->java_mirror());
2060 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2061 }
2062 }
2063 if (count < length) {
2064 // we had invalid entries so we need to compact the array
2065 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2066 count, CHECK_NULL);
2067 objArrayHandle result2(THREAD, r2);
2068 for (int i = 0; i < count; i++) {
2069 result2->obj_at_put(i, result->obj_at(i));
2070 }
2071 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2072 }
2073 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2074 } else {
2075 return NULL;
2076 }
2077 }
2078 JVM_END
2079
2080 // Constant pool access //////////////////////////////////////////////////////////
2081
2082 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2083 {
2084 JvmtiVMObjectAllocEventCollector oam;
2085 oop mirror = JNIHandles::resolve_non_null(cls);
2086 // Return null for primitives and arrays
2087 if (!java_lang_Class::is_primitive(mirror)) {
2088 Klass* k = java_lang_Class::as_Klass(mirror);
2089 if (k->is_instance_klass()) {
2090 InstanceKlass* k_h = InstanceKlass::cast(k);
2091 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2092 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2093 return JNIHandles::make_local(THREAD, jcp());
2094 }
2095 }
2096 return NULL;
2097 }
2098 JVM_END
2099
2100
2101 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2102 {
2103 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2104 return cp->length();
2105 }
2106 JVM_END
2107
2108
2109 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2110 {
2111 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2112 bounds_check(cp, index, CHECK_NULL);
2113 constantTag tag = cp->tag_at(index);
2114 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2115 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2116 }
2117 Klass* k = cp->klass_at(index, CHECK_NULL);
2118 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2119 }
2120 JVM_END
2121
2122 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2123 {
2124 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2125 bounds_check(cp, index, CHECK_NULL);
2126 constantTag tag = cp->tag_at(index);
2127 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2128 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2129 }
2130 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2131 if (k == NULL) return NULL;
2132 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2133 }
2134 JVM_END
2135
2136 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2137 constantTag tag = cp->tag_at(index);
2138 if (!tag.is_method() && !tag.is_interface_method()) {
2139 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2140 }
2141 int klass_ref = cp->uncached_klass_ref_index_at(index);
2142 Klass* k_o;
2143 if (force_resolution) {
2144 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2145 } else {
2146 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2147 if (k_o == NULL) return NULL;
2148 }
2149 InstanceKlass* k = InstanceKlass::cast(k_o);
2150 Symbol* name = cp->uncached_name_ref_at(index);
2151 Symbol* sig = cp->uncached_signature_ref_at(index);
2152 methodHandle m (THREAD, k->find_method(name, sig));
2153 if (m.is_null()) {
2154 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2155 }
2156 oop method;
2157 if (m->is_object_constructor() || m->is_static_init_factory()) {
2158 method = Reflection::new_constructor(m, CHECK_NULL);
2159 } else {
2160 method = Reflection::new_method(m, true, CHECK_NULL);
2161 }
2162 return JNIHandles::make_local(THREAD, method);
2163 }
2164
2165 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2166 {
2167 JvmtiVMObjectAllocEventCollector oam;
2168 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2169 bounds_check(cp, index, CHECK_NULL);
2170 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2171 return res;
2172 }
2173 JVM_END
2174
2175 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2176 {
2177 JvmtiVMObjectAllocEventCollector oam;
2178 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2179 bounds_check(cp, index, CHECK_NULL);
2180 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2181 return res;
2182 }
2183 JVM_END
2184
2185 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2186 constantTag tag = cp->tag_at(index);
2187 if (!tag.is_field()) {
2188 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2189 }
2190 int klass_ref = cp->uncached_klass_ref_index_at(index);
2191 Klass* k_o;
2192 if (force_resolution) {
2193 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2194 } else {
2195 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2196 if (k_o == NULL) return NULL;
2197 }
2198 InstanceKlass* k = InstanceKlass::cast(k_o);
2199 Symbol* name = cp->uncached_name_ref_at(index);
2200 Symbol* sig = cp->uncached_signature_ref_at(index);
2201 fieldDescriptor fd;
2202 Klass* target_klass = k->find_field(name, sig, &fd);
2203 if (target_klass == NULL) {
2204 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2205 }
2206 oop field = Reflection::new_field(&fd, CHECK_NULL);
2207 return JNIHandles::make_local(THREAD, field);
2208 }
2209
2210 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2211 {
2212 JvmtiVMObjectAllocEventCollector oam;
2213 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2214 bounds_check(cp, index, CHECK_NULL);
2215 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2216 return res;
2217 }
2218 JVM_END
2219
2220 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2221 {
2222 JvmtiVMObjectAllocEventCollector oam;
2223 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2224 bounds_check(cp, index, CHECK_NULL);
2225 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2226 return res;
2227 }
2228 JVM_END
2229
2230 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2231 {
2232 JvmtiVMObjectAllocEventCollector oam;
2233 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2234 bounds_check(cp, index, CHECK_NULL);
2235 constantTag tag = cp->tag_at(index);
2236 if (!tag.is_field_or_method()) {
2237 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2238 }
2239 int klass_ref = cp->uncached_klass_ref_index_at(index);
2240 Symbol* klass_name = cp->klass_name_at(klass_ref);
2241 Symbol* member_name = cp->uncached_name_ref_at(index);
2242 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2243 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2244 objArrayHandle dest(THREAD, dest_o);
2245 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2246 dest->obj_at_put(0, str());
2247 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2248 dest->obj_at_put(1, str());
2249 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2250 dest->obj_at_put(2, str());
2251 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2252 }
2253 JVM_END
2254
2255 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2256 {
2257 JvmtiVMObjectAllocEventCollector oam;
2258 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2259 bounds_check(cp, index, CHECK_0);
2260 constantTag tag = cp->tag_at(index);
2261 if (!tag.is_field_or_method()) {
2262 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2263 }
2264 return (jint) cp->uncached_klass_ref_index_at(index);
2265 }
2266 JVM_END
2267
2268 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2269 {
2270 JvmtiVMObjectAllocEventCollector oam;
2271 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2272 bounds_check(cp, index, CHECK_0);
2273 constantTag tag = cp->tag_at(index);
2274 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2275 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2276 }
2277 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2278 }
2279 JVM_END
2280
2281 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2282 {
2283 JvmtiVMObjectAllocEventCollector oam;
2284 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2285 bounds_check(cp, index, CHECK_NULL);
2286 constantTag tag = cp->tag_at(index);
2287 if (!tag.is_name_and_type()) {
2288 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2289 }
2290 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2291 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2292 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2293 objArrayHandle dest(THREAD, dest_o);
2294 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2295 dest->obj_at_put(0, str());
2296 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2297 dest->obj_at_put(1, str());
2298 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2299 }
2300 JVM_END
2301
2302 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2303 {
2304 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2305 bounds_check(cp, index, CHECK_0);
2306 constantTag tag = cp->tag_at(index);
2307 if (!tag.is_int()) {
2308 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2309 }
2310 return cp->int_at(index);
2311 }
2312 JVM_END
2313
2314 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2315 {
2316 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2317 bounds_check(cp, index, CHECK_(0L));
2318 constantTag tag = cp->tag_at(index);
2319 if (!tag.is_long()) {
2320 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2321 }
2322 return cp->long_at(index);
2323 }
2324 JVM_END
2325
2326 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2327 {
2328 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2329 bounds_check(cp, index, CHECK_(0.0f));
2330 constantTag tag = cp->tag_at(index);
2331 if (!tag.is_float()) {
2332 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2333 }
2334 return cp->float_at(index);
2335 }
2336 JVM_END
2337
2338 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2339 {
2340 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2341 bounds_check(cp, index, CHECK_(0.0));
2342 constantTag tag = cp->tag_at(index);
2343 if (!tag.is_double()) {
2344 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2345 }
2346 return cp->double_at(index);
2347 }
2348 JVM_END
2349
2350 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2351 {
2352 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2353 bounds_check(cp, index, CHECK_NULL);
2354 constantTag tag = cp->tag_at(index);
2355 if (!tag.is_string()) {
2356 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2357 }
2358 oop str = cp->string_at(index, CHECK_NULL);
2359 return (jstring) JNIHandles::make_local(THREAD, str);
2360 }
2361 JVM_END
2362
2363 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2364 {
2365 JvmtiVMObjectAllocEventCollector oam;
2366 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2367 bounds_check(cp, index, CHECK_NULL);
2368 constantTag tag = cp->tag_at(index);
2369 if (!tag.is_symbol()) {
2370 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2371 }
2372 Symbol* sym = cp->symbol_at(index);
2373 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2374 return (jstring) JNIHandles::make_local(THREAD, str());
2375 }
2376 JVM_END
2377
2378 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2379 {
2380 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2381 bounds_check(cp, index, CHECK_0);
2382 constantTag tag = cp->tag_at(index);
2383 jbyte result = tag.value();
2384 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2385 // they are changed to the corresponding tags from the JVM spec, so that java code in
2386 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2387 if (tag.is_klass_or_reference()) {
2388 result = JVM_CONSTANT_Class;
2389 } else if (tag.is_string_index()) {
2390 result = JVM_CONSTANT_String;
2391 } else if (tag.is_method_type_in_error()) {
2392 result = JVM_CONSTANT_MethodType;
2393 } else if (tag.is_method_handle_in_error()) {
2394 result = JVM_CONSTANT_MethodHandle;
2395 } else if (tag.is_dynamic_constant_in_error()) {
2396 result = JVM_CONSTANT_Dynamic;
2397 }
2398 return result;
2399 }
2400 JVM_END
2401
2402 // Assertion support. //////////////////////////////////////////////////////////
2403
2404 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2405 assert(cls != NULL, "bad class");
2406
2407 oop r = JNIHandles::resolve(cls);
2408 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2409 if (java_lang_Class::is_primitive(r)) return false;
2410
2411 Klass* k = java_lang_Class::as_Klass(r);
2412 assert(k->is_instance_klass(), "must be an instance klass");
2413 if (!k->is_instance_klass()) return false;
2414
2415 ResourceMark rm(THREAD);
2416 const char* name = k->name()->as_C_string();
2417 bool system_class = k->class_loader() == NULL;
2418 return JavaAssertions::enabled(name, system_class);
2419
2420 JVM_END
2421
2422
2423 // Return a new AssertionStatusDirectives object with the fields filled in with
2424 // command-line assertion arguments (i.e., -ea, -da).
2425 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2426 JvmtiVMObjectAllocEventCollector oam;
2427 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2428 return JNIHandles::make_local(THREAD, asd);
2429 JVM_END
2430
2431 // Arrays support /////////////////////////////////////////////////////////////
2432
2433 JVM_ENTRY(jboolean, JVM_ArrayIsAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2434 oop o = JNIHandles::resolve(array);
2435 Klass* k = o->klass();
2436 if ((o == NULL) || (!k->is_array_klass())) {
2437 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2438 }
2439 return ArrayKlass::cast(k)->element_access_is_atomic();
2440 JVM_END
2441
2442 JVM_ENTRY(jobject, JVM_ArrayEnsureAccessAtomic(JNIEnv *env, jclass unused, jobject array))
2443 oop o = JNIHandles::resolve(array);
2444 Klass* k = o->klass();
2445 if ((o == NULL) || (!k->is_array_klass())) {
2446 THROW_0(vmSymbols::java_lang_IllegalArgumentException());
2447 }
2448 if (k->is_flatArray_klass()) {
2449 FlatArrayKlass* vk = FlatArrayKlass::cast(k);
2450 if (!vk->element_access_is_atomic()) {
2451 /**
2452 * Need to decide how to implement:
2453 *
2454 * 1) Change to objArrayOop layout, therefore oop->klass() differs so
2455 * then "<atomic>[Qfoo;" klass needs to subclass "[Qfoo;" to pass through
2456 * "checkcast" & "instanceof"
2457 *
2458 * 2) Use extra header in the flatArrayOop to flag atomicity required and
2459 * possibly per instance lock structure. Said info, could be placed in
2460 * "trailer" rather than disturb the current arrayOop
2461 */
2462 Unimplemented();
2463 }
2464 }
2465 return array;
2466 JVM_END
2467
2468 // Verification ////////////////////////////////////////////////////////////////////////////////
2469
2470 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2471
2472 // RedefineClasses support: bug 6214132 caused verification to fail.
2473 // All functions from this section should call the jvmtiThreadSate function:
2474 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2475 // The function returns a Klass* of the _scratch_class if the verifier
2476 // was invoked in the middle of the class redefinition.
2477 // Otherwise it returns its argument value which is the _the_class Klass*.
2478 // Please, refer to the description in the jvmtiThreadSate.hpp.
2479
2480 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2481 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2482 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2483 return k->name()->as_utf8();
2484 JVM_END
2485
2486
2487 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2488 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2489 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2490 // types will have length zero if this is not an InstanceKlass
2491 // (length is determined by call to JVM_GetClassCPEntriesCount)
2492 if (k->is_instance_klass()) {
2493 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2494 for (int index = cp->length() - 1; index >= 0; index--) {
2495 constantTag tag = cp->tag_at(index);
2496 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2497 }
2498 }
2499 JVM_END
2500
2501
2502 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2503 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2504 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2505 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2506 JVM_END
2507
2508
2509 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2510 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2511 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2512 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2513 JVM_END
2514
2515
2516 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2517 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2518 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2519 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2520 JVM_END
2521
2522
2523 // The following methods, used for the verifier, are never called with
2524 // array klasses, so a direct cast to InstanceKlass is safe.
2525 // Typically, these methods are called in a loop with bounds determined
2526 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2527 // zero for arrays.
2528 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2529 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2530 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2531 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2532 int length = method->checked_exceptions_length();
2533 if (length > 0) {
2534 CheckedExceptionElement* table= method->checked_exceptions_start();
2535 for (int i = 0; i < length; i++) {
2536 exceptions[i] = table[i].class_cp_index;
2537 }
2538 }
2539 JVM_END
2540
2541
2542 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2544 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2545 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2546 return method->checked_exceptions_length();
2547 JVM_END
2548
2549
2550 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2551 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2552 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2553 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2554 memcpy(code, method->code_base(), method->code_size());
2555 JVM_END
2556
2557
2558 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2559 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2560 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2561 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2562 return method->code_size();
2563 JVM_END
2564
2565
2566 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2567 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2568 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2569 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2570 ExceptionTable extable(method);
2571 entry->start_pc = extable.start_pc(entry_index);
2572 entry->end_pc = extable.end_pc(entry_index);
2573 entry->handler_pc = extable.handler_pc(entry_index);
2574 entry->catchType = extable.catch_type_index(entry_index);
2575 JVM_END
2576
2577
2578 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2579 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2580 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2581 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2582 return method->exception_table_length();
2583 JVM_END
2584
2585
2586 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2587 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2588 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2589 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2590 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2591 JVM_END
2592
2593
2594 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2595 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2596 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2597 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2598 JVM_END
2599
2600
2601 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2603 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2604 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2605 return method->max_locals();
2606 JVM_END
2607
2608
2609 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2610 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2611 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2612 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2613 return method->size_of_parameters();
2614 JVM_END
2615
2616
2617 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2618 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2619 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2620 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2621 return method->verifier_max_stack();
2622 JVM_END
2623
2624
2625 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2626 ResourceMark rm(THREAD);
2627 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2628 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2629 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2630 return method->is_object_constructor();
2631 JVM_END
2632
2633
2634 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2635 ResourceMark rm(THREAD);
2636 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2637 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2638 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2639 return method->is_overpass();
2640 JVM_END
2641
2642 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2643 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2644 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2645 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2646 return method->name()->as_utf8();
2647 JVM_END
2648
2649
2650 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2651 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2652 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2653 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2654 return method->signature()->as_utf8();
2655 JVM_END
2656
2657 /**
2658 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2659 * read entries in the constant pool. Since the old verifier always
2660 * works on a copy of the code, it will not see any rewriting that
2661 * may possibly occur in the middle of verification. So it is important
2662 * that nothing it calls tries to use the cpCache instead of the raw
2663 * constant pool, so we must use cp->uncached_x methods when appropriate.
2664 */
2665 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2666 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2667 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2668 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2669 switch (cp->tag_at(cp_index).value()) {
2670 case JVM_CONSTANT_Fieldref:
2671 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2672 default:
2673 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2674 }
2675 ShouldNotReachHere();
2676 return NULL;
2677 JVM_END
2678
2679
2680 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2681 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2682 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2683 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2684 switch (cp->tag_at(cp_index).value()) {
2685 case JVM_CONSTANT_InterfaceMethodref:
2686 case JVM_CONSTANT_Methodref:
2687 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2688 default:
2689 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2690 }
2691 ShouldNotReachHere();
2692 return NULL;
2693 JVM_END
2694
2695
2696 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2697 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2698 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2699 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2700 switch (cp->tag_at(cp_index).value()) {
2701 case JVM_CONSTANT_InterfaceMethodref:
2702 case JVM_CONSTANT_Methodref:
2703 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2704 default:
2705 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2706 }
2707 ShouldNotReachHere();
2708 return NULL;
2709 JVM_END
2710
2711
2712 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2713 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2714 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2715 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2716 switch (cp->tag_at(cp_index).value()) {
2717 case JVM_CONSTANT_Fieldref:
2718 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2719 default:
2720 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2721 }
2722 ShouldNotReachHere();
2723 return NULL;
2724 JVM_END
2725
2726
2727 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2728 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2729 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2730 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2731 Symbol* classname = cp->klass_name_at(cp_index);
2732 return classname->as_utf8();
2733 JVM_END
2734
2735
2736 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2737 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2738 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2739 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2740 switch (cp->tag_at(cp_index).value()) {
2741 case JVM_CONSTANT_Fieldref: {
2742 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2743 Symbol* classname = cp->klass_name_at(class_index);
2744 return classname->as_utf8();
2745 }
2746 default:
2747 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2748 }
2749 ShouldNotReachHere();
2750 return NULL;
2751 JVM_END
2752
2753
2754 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2755 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2756 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2757 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2758 switch (cp->tag_at(cp_index).value()) {
2759 case JVM_CONSTANT_Methodref:
2760 case JVM_CONSTANT_InterfaceMethodref: {
2761 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2762 Symbol* classname = cp->klass_name_at(class_index);
2763 return classname->as_utf8();
2764 }
2765 default:
2766 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2767 }
2768 ShouldNotReachHere();
2769 return NULL;
2770 JVM_END
2771
2772
2773 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2774 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2775 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2776 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2777 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2778 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2779 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2780 switch (cp->tag_at(cp_index).value()) {
2781 case JVM_CONSTANT_Fieldref: {
2782 Symbol* name = cp->uncached_name_ref_at(cp_index);
2783 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2784 InstanceKlass* ik = InstanceKlass::cast(k_called);
2785 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2786 if (fs.name() == name && fs.signature() == signature) {
2787 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2788 }
2789 }
2790 return -1;
2791 }
2792 default:
2793 fatal("JVM_GetCPFieldModifiers: illegal constant");
2794 }
2795 ShouldNotReachHere();
2796 return 0;
2797 JVM_END
2798
2799
2800 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2801 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2802 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2803 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2804 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2805 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2806 switch (cp->tag_at(cp_index).value()) {
2807 case JVM_CONSTANT_Methodref:
2808 case JVM_CONSTANT_InterfaceMethodref: {
2809 Symbol* name = cp->uncached_name_ref_at(cp_index);
2810 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2811 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2812 int methods_count = methods->length();
2813 for (int i = 0; i < methods_count; i++) {
2814 Method* method = methods->at(i);
2815 if (method->name() == name && method->signature() == signature) {
2816 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2817 }
2818 }
2819 return -1;
2820 }
2821 default:
2822 fatal("JVM_GetCPMethodModifiers: illegal constant");
2823 }
2824 ShouldNotReachHere();
2825 return 0;
2826 JVM_END
2827
2828
2829 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2830
2831 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2832 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2833 JVM_END
2834
2835
2836 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2837 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2838 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2839 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2840 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2841 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2842 JVM_END
2843
2844 // Printing support //////////////////////////////////////////////////
2845 extern "C" {
2846
2847 ATTRIBUTE_PRINTF(3, 0)
2848 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2849 // Reject count values that are negative signed values converted to
2850 // unsigned; see bug 4399518, 4417214
2851 if ((intptr_t)count <= 0) return -1;
2852
2853 int result = os::vsnprintf(str, count, fmt, args);
2854 if (result > 0 && (size_t)result >= count) {
2855 result = -1;
2856 }
2857
2858 return result;
2859 }
2860
2861 ATTRIBUTE_PRINTF(3, 4)
2862 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2863 va_list args;
2864 int len;
2865 va_start(args, fmt);
2866 len = jio_vsnprintf(str, count, fmt, args);
2867 va_end(args);
2868 return len;
2869 }
2870
2871 ATTRIBUTE_PRINTF(2, 3)
2872 int jio_fprintf(FILE* f, const char *fmt, ...) {
2873 int len;
2874 va_list args;
2875 va_start(args, fmt);
2876 len = jio_vfprintf(f, fmt, args);
2877 va_end(args);
2878 return len;
2879 }
2880
2881 ATTRIBUTE_PRINTF(2, 0)
2882 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2883 if (Arguments::vfprintf_hook() != NULL) {
2884 return Arguments::vfprintf_hook()(f, fmt, args);
2885 } else {
2886 return vfprintf(f, fmt, args);
2887 }
2888 }
2889
2890 ATTRIBUTE_PRINTF(1, 2)
2891 JNIEXPORT int jio_printf(const char *fmt, ...) {
2892 int len;
2893 va_list args;
2894 va_start(args, fmt);
2895 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2896 va_end(args);
2897 return len;
2898 }
2899
2900 // HotSpot specific jio method
2901 void jio_print(const char* s, size_t len) {
2902 // Try to make this function as atomic as possible.
2903 if (Arguments::vfprintf_hook() != NULL) {
2904 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2905 } else {
2906 // Make an unused local variable to avoid warning from gcc compiler.
2907 ssize_t count = os::write(defaultStream::output_fd(), s, (int)len);
2908 }
2909 }
2910
2911 } // Extern C
2912
2913 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2914
2915 // In most of the JVM thread support functions we need to access the
2916 // thread through a ThreadsListHandle to prevent it from exiting and
2917 // being reclaimed while we try to operate on it. The exceptions to this
2918 // rule are when operating on the current thread, or if the monitor of
2919 // the target java.lang.Thread is locked at the Java level - in both
2920 // cases the target cannot exit.
2921
2922 static void thread_entry(JavaThread* thread, TRAPS) {
2923 HandleMark hm(THREAD);
2924 Handle obj(THREAD, thread->threadObj());
2925 JavaValue result(T_VOID);
2926 JavaCalls::call_virtual(&result,
2927 obj,
2928 vmClasses::Thread_klass(),
2929 vmSymbols::run_method_name(),
2930 vmSymbols::void_method_signature(),
2931 THREAD);
2932 }
2933
2934
2935 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2936 #if INCLUDE_CDS
2937 if (DumpSharedSpaces) {
2938 // During java -Xshare:dump, if we allow multiple Java threads to
2939 // execute in parallel, symbols and classes may be loaded in
2940 // random orders which will make the resulting CDS archive
2941 // non-deterministic.
2942 //
2943 // Lucikly, during java -Xshare:dump, it's important to run only
2944 // the code in the main Java thread (which is NOT started here) that
2945 // creates the module graph, etc. It's safe to not start the other
2946 // threads which are launched by class static initializers
2947 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2948 if (log_is_enabled(Info, cds)) {
2949 ResourceMark rm;
2950 oop t = JNIHandles::resolve_non_null(jthread);
2951 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2952 }
2953 return;
2954 }
2955 #endif
2956 JavaThread *native_thread = NULL;
2957
2958 // We cannot hold the Threads_lock when we throw an exception,
2959 // due to rank ordering issues. Example: we might need to grab the
2960 // Heap_lock while we construct the exception.
2961 bool throw_illegal_thread_state = false;
2962
2963 // We must release the Threads_lock before we can post a jvmti event
2964 // in Thread::start.
2965 {
2966 // Ensure that the C++ Thread and OSThread structures aren't freed before
2967 // we operate.
2968 MutexLocker mu(Threads_lock);
2969
2970 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2971 // re-starting an already started thread, so we should usually find
2972 // that the JavaThread is null. However for a JNI attached thread
2973 // there is a small window between the Thread object being created
2974 // (with its JavaThread set) and the update to its threadStatus, so we
2975 // have to check for this
2976 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2977 throw_illegal_thread_state = true;
2978 } else {
2979 // We could also check the stillborn flag to see if this thread was already stopped, but
2980 // for historical reasons we let the thread detect that itself when it starts running
2981
2982 jlong size =
2983 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2984 // Allocate the C++ Thread structure and create the native thread. The
2985 // stack size retrieved from java is 64-bit signed, but the constructor takes
2986 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2987 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2988 // - Avoid passing negative values which would result in really large stacks.
2989 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2990 size_t sz = size > 0 ? (size_t) size : 0;
2991 native_thread = new JavaThread(&thread_entry, sz);
2992
2993 // At this point it may be possible that no osthread was created for the
2994 // JavaThread due to lack of memory. Check for this situation and throw
2995 // an exception if necessary. Eventually we may want to change this so
2996 // that we only grab the lock if the thread was created successfully -
2997 // then we can also do this check and throw the exception in the
2998 // JavaThread constructor.
2999 if (native_thread->osthread() != NULL) {
3000 // Note: the current thread is not being used within "prepare".
3001 native_thread->prepare(jthread);
3002 }
3003 }
3004 }
3005
3006 if (throw_illegal_thread_state) {
3007 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3008 }
3009
3010 assert(native_thread != NULL, "Starting null thread?");
3011
3012 if (native_thread->osthread() == NULL) {
3013 ResourceMark rm(thread);
3014 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3015 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3016 // No one should hold a reference to the 'native_thread'.
3017 native_thread->smr_delete();
3018 if (JvmtiExport::should_post_resource_exhausted()) {
3019 JvmtiExport::post_resource_exhausted(
3020 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3021 os::native_thread_creation_failed_msg());
3022 }
3023 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3024 os::native_thread_creation_failed_msg());
3025 }
3026
3027 #if INCLUDE_JFR
3028 if (Jfr::is_recording() && EventThreadStart::is_enabled() &&
3029 EventThreadStart::is_stacktrace_enabled()) {
3030 JfrThreadLocal* tl = native_thread->jfr_thread_local();
3031 // skip Thread.start() and Thread.start0()
3032 tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(thread, 2));
3033 }
3034 #endif
3035
3036 Thread::start(native_thread);
3037
3038 JVM_END
3039
3040
3041 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
3042 // before the quasi-asynchronous exception is delivered. This is a little obtrusive,
3043 // but is thought to be reliable and simple. In the case, where the receiver is the
3044 // same thread as the sender, no VM_Operation is needed.
3045 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
3046 ThreadsListHandle tlh(thread);
3047 oop java_throwable = JNIHandles::resolve(throwable);
3048 if (java_throwable == NULL) {
3049 THROW(vmSymbols::java_lang_NullPointerException());
3050 }
3051 oop java_thread = NULL;
3052 JavaThread* receiver = NULL;
3053 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3054 Events::log_exception(thread,
3055 "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
3056 p2i(receiver), p2i(java_thread), p2i(throwable));
3057
3058 if (is_alive) {
3059 // jthread refers to a live JavaThread.
3060 if (thread == receiver) {
3061 // Exception is getting thrown at self so no VM_Operation needed.
3062 THROW_OOP(java_throwable);
3063 } else {
3064 // Use a VM_Operation to throw the exception.
3065 JavaThread::send_async_exception(receiver, java_throwable);
3066 }
3067 } else {
3068 // Either:
3069 // - target thread has not been started before being stopped, or
3070 // - target thread already terminated
3071 // We could read the threadStatus to determine which case it is
3072 // but that is overkill as it doesn't matter. We must set the
3073 // stillborn flag for the first case, and if the thread has already
3074 // exited setting this flag has no effect.
3075 java_lang_Thread::set_stillborn(java_thread);
3076 }
3077 JVM_END
3078
3079
3080 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3081 oop thread_oop = JNIHandles::resolve_non_null(jthread);
3082 return java_lang_Thread::is_alive(thread_oop);
3083 JVM_END
3084
3085
3086 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3087 ThreadsListHandle tlh(thread);
3088 JavaThread* receiver = NULL;
3089 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3090 if (is_alive) {
3091 // jthread refers to a live JavaThread, but java_suspend() will
3092 // detect a thread that has started to exit and will ignore it.
3093 receiver->java_suspend();
3094 }
3095 JVM_END
3096
3097
3098 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3099 ThreadsListHandle tlh(thread);
3100 JavaThread* receiver = NULL;
3101 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3102 if (is_alive) {
3103 // jthread refers to a live JavaThread.
3104 receiver->java_resume();
3105 }
3106 JVM_END
3107
3108
3109 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3110 ThreadsListHandle tlh(thread);
3111 oop java_thread = NULL;
3112 JavaThread* receiver = NULL;
3113 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3114 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3115
3116 if (is_alive) {
3117 // jthread refers to a live JavaThread.
3118 Thread::set_priority(receiver, (ThreadPriority)prio);
3119 }
3120 // Implied else: If the JavaThread hasn't started yet, then the
3121 // priority set in the java.lang.Thread object above will be pushed
3122 // down when it does start.
3123 JVM_END
3124
3125
3126 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3127 if (os::dont_yield()) return;
3128 HOTSPOT_THREAD_YIELD();
3129 os::naked_yield();
3130 JVM_END
3131
3132 static void post_thread_sleep_event(EventThreadSleep* event, jlong millis) {
3133 assert(event != NULL, "invariant");
3134 assert(event->should_commit(), "invariant");
3135 event->set_time(millis);
3136 event->commit();
3137 }
3138
3139 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3140 if (millis < 0) {
3141 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3142 }
3143
3144 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3145 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3146 }
3147
3148 // Save current thread state and restore it at the end of this block.
3149 // And set new thread state to SLEEPING.
3150 JavaThreadSleepState jtss(thread);
3151
3152 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3153 EventThreadSleep event;
3154
3155 if (millis == 0) {
3156 os::naked_yield();
3157 } else {
3158 ThreadState old_state = thread->osthread()->get_state();
3159 thread->osthread()->set_state(SLEEPING);
3160 if (!thread->sleep(millis)) { // interrupted
3161 // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3162 // us while we were sleeping. We do not overwrite those.
3163 if (!HAS_PENDING_EXCEPTION) {
3164 if (event.should_commit()) {
3165 post_thread_sleep_event(&event, millis);
3166 }
3167 HOTSPOT_THREAD_SLEEP_END(1);
3168
3169 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3170 // to properly restore the thread state. That's likely wrong.
3171 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3172 }
3173 }
3174 thread->osthread()->set_state(old_state);
3175 }
3176 if (event.should_commit()) {
3177 post_thread_sleep_event(&event, millis);
3178 }
3179 HOTSPOT_THREAD_SLEEP_END(0);
3180 JVM_END
3181
3182 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3183 oop jthread = thread->threadObj();
3184 assert(jthread != NULL, "no current thread!");
3185 return JNIHandles::make_local(THREAD, jthread);
3186 JVM_END
3187
3188 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3189 ThreadsListHandle tlh(thread);
3190 JavaThread* receiver = NULL;
3191 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3192 if (is_alive) {
3193 // jthread refers to a live JavaThread.
3194 receiver->interrupt();
3195 }
3196 JVM_END
3197
3198
3199 // Return true iff the current thread has locked the object passed in
3200
3201 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3202 if (obj == NULL) {
3203 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3204 }
3205 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3206 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3207 JVM_END
3208
3209
3210 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3211 VM_PrintThreads op;
3212 VMThread::execute(&op);
3213 if (JvmtiExport::should_post_data_dump()) {
3214 JvmtiExport::post_data_dump();
3215 }
3216 JVM_END
3217
3218 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3219 // We don't use a ThreadsListHandle here because the current thread
3220 // must be alive.
3221 oop java_thread = JNIHandles::resolve_non_null(jthread);
3222 JavaThread* thr = java_lang_Thread::thread(java_thread);
3223 if (thread == thr && !thr->has_attached_via_jni()) {
3224 // Thread naming is only supported for the current thread and
3225 // we don't set the name of an attached thread to avoid stepping
3226 // on other programs.
3227 ResourceMark rm(thread);
3228 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3229 os::set_native_thread_name(thread_name);
3230 }
3231 JVM_END
3232
3233 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3234
3235 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3236 ResourceMark rm(THREAD);
3237 JvmtiVMObjectAllocEventCollector oam;
3238 vframeStream vfst(thread);
3239
3240 if (vmClasses::reflect_CallerSensitive_klass() != NULL) {
3241 // This must only be called from SecurityManager.getClassContext
3242 Method* m = vfst.method();
3243 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3244 m->name() == vmSymbols::getClassContext_name() &&
3245 m->signature() == vmSymbols::void_class_array_signature())) {
3246 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3247 }
3248 }
3249
3250 // Collect method holders
3251 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3252 for (; !vfst.at_end(); vfst.security_next()) {
3253 Method* m = vfst.method();
3254 // Native frames are not returned
3255 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3256 Klass* holder = m->method_holder();
3257 assert(holder->is_klass(), "just checking");
3258 klass_array->append(holder);
3259 }
3260 }
3261
3262 // Create result array of type [Ljava/lang/Class;
3263 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3264 // Fill in mirrors corresponding to method holders
3265 for (int i = 0; i < klass_array->length(); i++) {
3266 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3267 }
3268
3269 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3270 JVM_END
3271
3272
3273 // java.lang.Package ////////////////////////////////////////////////////////////////
3274
3275
3276 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3277 ResourceMark rm(THREAD);
3278 JvmtiVMObjectAllocEventCollector oam;
3279 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3280 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3281 return (jstring) JNIHandles::make_local(THREAD, result);
3282 JVM_END
3283
3284
3285 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3286 JvmtiVMObjectAllocEventCollector oam;
3287 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3288 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3289 JVM_END
3290
3291
3292 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3293
3294
3295 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3296 MonitorLocker ml(Heap_lock);
3297 oop ref = Universe::reference_pending_list();
3298 if (ref != NULL) {
3299 Universe::clear_reference_pending_list();
3300 }
3301 return JNIHandles::make_local(THREAD, ref);
3302 JVM_END
3303
3304 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3305 MonitorLocker ml(Heap_lock);
3306 return Universe::has_reference_pending_list();
3307 JVM_END
3308
3309 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3310 MonitorLocker ml(Heap_lock);
3311 while (!Universe::has_reference_pending_list()) {
3312 ml.wait();
3313 }
3314 JVM_END
3315
3316 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3317 oop ref_oop = JNIHandles::resolve_non_null(ref);
3318 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3319 return referent == JNIHandles::resolve(o);
3320 JVM_END
3321
3322 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3323 oop ref_oop = JNIHandles::resolve_non_null(ref);
3324 // FinalReference has it's own implementation of clear().
3325 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3326 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == NULL) {
3327 // If the referent has already been cleared then done.
3328 // However, if the referent is dead but has not yet been cleared by
3329 // concurrent reference processing, it should NOT be cleared here.
3330 // Instead, clearing should be left to the GC. Clearing it here could
3331 // detectably lose an expected notification, which is impossible with
3332 // STW reference processing. The clearing in enqueue() doesn't have
3333 // this problem, since the enqueue covers the notification, but it's not
3334 // worth the effort to handle that case specially.
3335 return;
3336 }
3337 java_lang_ref_Reference::clear_referent(ref_oop);
3338 JVM_END
3339
3340
3341 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3342
3343
3344 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3345 oop ref_oop = JNIHandles::resolve_non_null(ref);
3346 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3347 return referent == JNIHandles::resolve(o);
3348 JVM_END
3349
3350
3351 // ObjectInputStream ///////////////////////////////////////////////////////////////
3352
3353 // Return the first user-defined class loader up the execution stack, or null
3354 // if only code from the bootstrap or platform class loader is on the stack.
3355
3356 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3357 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3358 InstanceKlass* ik = vfst.method()->method_holder();
3359 oop loader = ik->class_loader();
3360 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3361 // Skip reflection related frames
3362 if (!ik->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass()) &&
3363 !ik->is_subclass_of(vmClasses::reflect_ConstructorAccessorImpl_klass())) {
3364 return JNIHandles::make_local(THREAD, loader);
3365 }
3366 }
3367 }
3368 return NULL;
3369 JVM_END
3370
3371
3372 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3373
3374
3375 // resolve array handle and check arguments
3376 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3377 if (arr == NULL) {
3378 THROW_0(vmSymbols::java_lang_NullPointerException());
3379 }
3380 oop a = JNIHandles::resolve_non_null(arr);
3381 if (!a->is_array()) {
3382 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3383 } else if (type_array_only && !a->is_typeArray()) {
3384 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3385 }
3386 return arrayOop(a);
3387 }
3388
3389
3390 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3391 arrayOop a = check_array(env, arr, false, CHECK_0);
3392 return a->length();
3393 JVM_END
3394
3395
3396 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3397 JvmtiVMObjectAllocEventCollector oam;
3398 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3399 jvalue value;
3400 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3401 oop box = Reflection::box(&value, type, CHECK_NULL);
3402 return JNIHandles::make_local(THREAD, box);
3403 JVM_END
3404
3405
3406 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3407 jvalue value;
3408 value.i = 0; // to initialize value before getting used in CHECK
3409 arrayOop a = check_array(env, arr, true, CHECK_(value));
3410 assert(a->is_typeArray(), "just checking");
3411 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3412 BasicType wide_type = (BasicType) wCode;
3413 if (type != wide_type) {
3414 Reflection::widen(&value, type, wide_type, CHECK_(value));
3415 }
3416 return value;
3417 JVM_END
3418
3419
3420 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3421 arrayOop a = check_array(env, arr, false, CHECK);
3422 oop box = JNIHandles::resolve(val);
3423 jvalue value;
3424 value.i = 0; // to initialize value before getting used in CHECK
3425 BasicType value_type;
3426 if (a->is_objArray()) {
3427 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3428 value_type = Reflection::unbox_for_regular_object(box, &value);
3429 } else {
3430 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3431 }
3432 Reflection::array_set(&value, a, index, value_type, CHECK);
3433 JVM_END
3434
3435
3436 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3437 arrayOop a = check_array(env, arr, true, CHECK);
3438 assert(a->is_typeArray(), "just checking");
3439 BasicType value_type = (BasicType) vCode;
3440 Reflection::array_set(&v, a, index, value_type, CHECK);
3441 JVM_END
3442
3443
3444 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3445 JvmtiVMObjectAllocEventCollector oam;
3446 oop element_mirror = JNIHandles::resolve(eltClass);
3447 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3448 return JNIHandles::make_local(THREAD, result);
3449 JVM_END
3450
3451
3452 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3453 JvmtiVMObjectAllocEventCollector oam;
3454 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3455 oop element_mirror = JNIHandles::resolve(eltClass);
3456 assert(dim_array->is_typeArray(), "just checking");
3457 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3458 return JNIHandles::make_local(THREAD, result);
3459 JVM_END
3460
3461
3462 // Library support ///////////////////////////////////////////////////////////////////////////
3463
3464 JVM_LEAF(void*, JVM_LoadZipLibrary())
3465 ClassLoader::load_zip_library_if_needed();
3466 return ClassLoader::zip_library_handle();
3467 JVM_END
3468
3469 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3470 //%note jvm_ct
3471 char ebuf[1024];
3472 void *load_result;
3473 {
3474 ThreadToNativeFromVM ttnfvm(thread);
3475 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3476 }
3477 if (load_result == NULL) {
3478 if (throwException) {
3479 char msg[1024];
3480 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3481 // Since 'ebuf' may contain a string encoded using
3482 // platform encoding scheme, we need to pass
3483 // Exceptions::unsafe_to_utf8 to the new_exception method
3484 // as the last argument. See bug 6367357.
3485 Handle h_exception =
3486 Exceptions::new_exception(thread,
3487 vmSymbols::java_lang_UnsatisfiedLinkError(),
3488 msg, Exceptions::unsafe_to_utf8);
3489
3490 THROW_HANDLE_0(h_exception);
3491 } else {
3492 log_info(library)("Failed to load library %s", name);
3493 return load_result;
3494 }
3495 }
3496 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3497 return load_result;
3498 JVM_END
3499
3500
3501 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3502 os::dll_unload(handle);
3503 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3504 JVM_END
3505
3506
3507 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3508 void* find_result = os::dll_lookup(handle, name);
3509 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3510 find_result != NULL ? "Found" : "Failed to find",
3511 name, p2i(handle));
3512 return find_result;
3513 JVM_END
3514
3515
3516 // JNI version ///////////////////////////////////////////////////////////////////////////////
3517
3518 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3519 return Threads::is_supported_jni_version_including_1_1(version);
3520 JVM_END
3521
3522
3523 // String support ///////////////////////////////////////////////////////////////////////////
3524
3525 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3526 JvmtiVMObjectAllocEventCollector oam;
3527 if (str == NULL) return NULL;
3528 oop string = JNIHandles::resolve_non_null(str);
3529 oop result = StringTable::intern(string, CHECK_NULL);
3530 return (jstring) JNIHandles::make_local(THREAD, result);
3531 JVM_END
3532
3533
3534 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3535
3536 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3537 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3538 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3539 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3540 // nature. JavaThreads will be "in native" when using this API from JDK code.
3541
3542
3543 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3544 VM_Exit::block_if_vm_exited();
3545 return new os::PlatformMutex();
3546 }
3547
3548
3549 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3550 VM_Exit::block_if_vm_exited();
3551 delete ((os::PlatformMutex*) mon);
3552 }
3553
3554
3555 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3556 VM_Exit::block_if_vm_exited();
3557 ((os::PlatformMutex*) mon)->lock();
3558 return 0;
3559 }
3560
3561
3562 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3563 VM_Exit::block_if_vm_exited();
3564 ((os::PlatformMutex*) mon)->unlock();
3565 }
3566
3567
3568 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3569
3570 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3571 Handle loader, Handle protection_domain,
3572 jboolean throwError, TRAPS) {
3573 // Security Note:
3574 // The Java level wrapper will perform the necessary security check allowing
3575 // us to pass the NULL as the initiating class loader. The VM is responsible for
3576 // the checkPackageAccess relative to the initiating class loader via the
3577 // protection_domain. The protection_domain is passed as NULL by the java code
3578 // if there is no security manager in 3-arg Class.forName().
3579 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3580
3581 // Check if we should initialize the class
3582 if (init && klass->is_instance_klass()) {
3583 klass->initialize(CHECK_NULL);
3584 }
3585 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3586 }
3587
3588
3589 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3590
3591 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3592 Handle method_handle;
3593 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3594 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3595 Handle receiver(THREAD, JNIHandles::resolve(obj));
3596 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3597 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3598 jobject res = JNIHandles::make_local(THREAD, result);
3599 if (JvmtiExport::should_post_vm_object_alloc()) {
3600 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3601 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3602 if (java_lang_Class::is_primitive(ret_type)) {
3603 // Only for primitive type vm allocates memory for java object.
3604 // See box() method.
3605 JvmtiExport::post_vm_object_alloc(thread, result);
3606 }
3607 }
3608 return res;
3609 } else {
3610 THROW_0(vmSymbols::java_lang_StackOverflowError());
3611 }
3612 JVM_END
3613
3614
3615 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3616 objArrayHandle args = oopFactory::ensure_objArray(JNIHandles::resolve(args0), CHECK_NULL);
3617 oop constructor_mirror = JNIHandles::resolve(c);
3618 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3619 jobject res = JNIHandles::make_local(THREAD, result);
3620 if (JvmtiExport::should_post_vm_object_alloc()) {
3621 JvmtiExport::post_vm_object_alloc(thread, result);
3622 }
3623 return res;
3624 JVM_END
3625
3626 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3627
3628 JVM_LEAF(jboolean, JVM_SupportsCX8())
3629 return VM_Version::supports_cx8();
3630 JVM_END
3631
3632 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3633 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3634 assert(k->is_klass(), "just checking");
3635 HeapShared::initialize_from_archived_subgraph(k, THREAD);
3636 JVM_END
3637
3638 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3639 jclass caller,
3640 jstring interfaceMethodName,
3641 jobject factoryType,
3642 jobject interfaceMethodType,
3643 jobject implementationMember,
3644 jobject dynamicMethodType,
3645 jclass lambdaProxyClass))
3646 #if INCLUDE_CDS
3647 if (!Arguments::is_dumping_archive()) {
3648 return;
3649 }
3650
3651 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3652 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3653 if (caller_ik->is_hidden()) {
3654 // Hidden classes not of type lambda proxy classes are currently not being archived.
3655 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3656 // registered for archiving.
3657 return;
3658 }
3659 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3660 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3661 assert(lambda_ik->is_hidden(), "must be a hidden class");
3662 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3663
3664 Symbol* interface_method_name = NULL;
3665 if (interfaceMethodName != NULL) {
3666 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3667 }
3668 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3669 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3670
3671 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3672 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3673
3674 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3675 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3676 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3677
3678 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3679 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3680
3681 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3682 interface_method_type, m, dynamic_method_type, THREAD);
3683 #endif // INCLUDE_CDS
3684 JVM_END
3685
3686 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3687 jclass caller,
3688 jstring interfaceMethodName,
3689 jobject factoryType,
3690 jobject interfaceMethodType,
3691 jobject implementationMember,
3692 jobject dynamicMethodType))
3693 #if INCLUDE_CDS
3694
3695 if (interfaceMethodName == NULL || factoryType == NULL || interfaceMethodType == NULL ||
3696 implementationMember == NULL || dynamicMethodType == NULL) {
3697 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
3698 }
3699
3700 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3701 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3702 if (!caller_ik->is_shared()) {
3703 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3704 return NULL;
3705 }
3706
3707 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3708 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3709 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3710
3711 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3712 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3713
3714 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3715 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3716 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3717
3718 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3719 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3720
3721 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3722 interface_method_type, m, dynamic_method_type);
3723 jclass jcls = NULL;
3724 if (lambda_ik != NULL) {
3725 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3726 jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3727 }
3728 return jcls;
3729 #else
3730 return NULL;
3731 #endif // INCLUDE_CDS
3732 JVM_END
3733
3734 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3735 return Arguments::is_dumping_archive();
3736 JVM_END
3737
3738 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env))
3739 return UseSharedSpaces;
3740 JVM_END
3741
3742 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3743 if (DumpSharedSpaces) {
3744 const char* release = VM_Version::vm_release();
3745 const char* dbg_level = VM_Version::jdk_debug_level();
3746 const char* version = VM_Version::internal_vm_info_string();
3747 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3748 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3749 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3750 seed += (jlong)VM_Version::vm_major_version();
3751 seed += (jlong)VM_Version::vm_minor_version();
3752 seed += (jlong)VM_Version::vm_security_version();
3753 seed += (jlong)VM_Version::vm_patch_version();
3754 if (seed == 0) { // don't let this ever be zero.
3755 seed = 0x87654321;
3756 }
3757 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3758 return seed;
3759 } else {
3760 return 0;
3761 }
3762 JVM_END
3763
3764 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env))
3765 #if INCLUDE_CDS
3766 return ClassListWriter::is_enabled() || DynamicDumpSharedSpaces;
3767 #else
3768 return false;
3769 #endif // INCLUDE_CDS
3770 JVM_END
3771
3772 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3773 #if INCLUDE_CDS
3774 assert(ClassListWriter::is_enabled() || DynamicDumpSharedSpaces, "Should be set and open or do dynamic dump");
3775 if (line != NULL) {
3776 ResourceMark rm(THREAD);
3777 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3778 char* c_line = java_lang_String::as_utf8_string(h_line());
3779 if (DynamicDumpSharedSpaces) {
3780 // Note: LambdaFormInvokers::append take same format which is not
3781 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3782 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3783 }
3784 if (ClassListWriter::is_enabled()) {
3785 ClassListWriter w;
3786 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line);
3787 }
3788 }
3789 #endif // INCLUDE_CDS
3790 JVM_END
3791
3792 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3793 #if INCLUDE_CDS
3794 ResourceMark rm(THREAD);
3795 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3796 char* file_name = java_lang_String::as_utf8_string(file_handle());
3797 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3798 #endif // INCLUDE_CDS
3799 JVM_END
3800
3801 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3802 #if INCLUDE_CDS
3803 ResourceMark rm(THREAD);
3804 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3805 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3806 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3807 #endif // INCLUDE_CDS
3808 JVM_END
3809
3810 // Returns an array of all live Thread objects (VM internal JavaThreads,
3811 // jvmti agent threads, and JNI attaching threads are skipped)
3812 // See CR 6404306 regarding JNI attaching threads
3813 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3814 ResourceMark rm(THREAD);
3815 ThreadsListEnumerator tle(THREAD, false, false);
3816 JvmtiVMObjectAllocEventCollector oam;
3817
3818 int num_threads = tle.num_threads();
3819 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3820 objArrayHandle threads_ah(THREAD, r);
3821
3822 for (int i = 0; i < num_threads; i++) {
3823 Handle h = tle.get_threadObj(i);
3824 threads_ah->obj_at_put(i, h());
3825 }
3826
3827 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3828 JVM_END
3829
3830
3831 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3832 // Return StackTraceElement[][], each element is the stack trace of a thread in
3833 // the corresponding entry in the given threads array
3834 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3835 JvmtiVMObjectAllocEventCollector oam;
3836
3837 // Check if threads is null
3838 if (threads == NULL) {
3839 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3840 }
3841
3842 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3843 objArrayHandle ah(THREAD, a);
3844 int num_threads = ah->length();
3845 // check if threads is non-empty array
3846 if (num_threads == 0) {
3847 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3848 }
3849
3850 // check if threads is not an array of objects of Thread class
3851 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3852 if (k != vmClasses::Thread_klass()) {
3853 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3854 }
3855
3856 ResourceMark rm(THREAD);
3857
3858 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3859 for (int i = 0; i < num_threads; i++) {
3860 oop thread_obj = ah->obj_at(i);
3861 instanceHandle h(THREAD, (instanceOop) thread_obj);
3862 thread_handle_array->append(h);
3863 }
3864
3865 // The JavaThread references in thread_handle_array are validated
3866 // in VM_ThreadDump::doit().
3867 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3868 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3869
3870 JVM_END
3871
3872 // JVM monitoring and management support
3873 JVM_LEAF(void*, JVM_GetManagement(jint version))
3874 return Management::get_jmm_interface(version);
3875 JVM_END
3876
3877 // com.sun.tools.attach.VirtualMachine agent properties support
3878 //
3879 // Initialize the agent properties with the properties maintained in the VM
3880 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3881 ResourceMark rm;
3882
3883 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3884
3885 PUTPROP(props, "sun.java.command", Arguments::java_command());
3886 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3887 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3888 return properties;
3889 JVM_END
3890
3891 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3892 {
3893 JvmtiVMObjectAllocEventCollector oam;
3894
3895 if (ofClass == NULL) {
3896 return NULL;
3897 }
3898 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3899 // Special handling for primitive objects
3900 if (java_lang_Class::is_primitive(mirror())) {
3901 return NULL;
3902 }
3903 Klass* k = java_lang_Class::as_Klass(mirror());
3904 if (!k->is_instance_klass()) {
3905 return NULL;
3906 }
3907 InstanceKlass* ik = InstanceKlass::cast(k);
3908 int encl_method_class_idx = ik->enclosing_method_class_index();
3909 if (encl_method_class_idx == 0) {
3910 return NULL;
3911 }
3912 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3913 objArrayHandle dest(THREAD, dest_o);
3914 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3915 dest->obj_at_put(0, enc_k->java_mirror());
3916 int encl_method_method_idx = ik->enclosing_method_method_index();
3917 if (encl_method_method_idx != 0) {
3918 Symbol* sym = ik->constants()->symbol_at(
3919 extract_low_short_from_int(
3920 ik->constants()->name_and_type_at(encl_method_method_idx)));
3921 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3922 dest->obj_at_put(1, str());
3923 sym = ik->constants()->symbol_at(
3924 extract_high_short_from_int(
3925 ik->constants()->name_and_type_at(encl_method_method_idx)));
3926 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3927 dest->obj_at_put(2, str());
3928 }
3929 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3930 }
3931 JVM_END
3932
3933 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3934 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3935 ResourceMark rm(THREAD);
3936
3937 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3938 return NULL;
3939 }
3940
3941 char** vm_flags = Arguments::jvm_flags_array();
3942 char** vm_args = Arguments::jvm_args_array();
3943 int num_flags = Arguments::num_jvm_flags();
3944 int num_args = Arguments::num_jvm_args();
3945
3946 InstanceKlass* ik = vmClasses::String_klass();
3947 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3948 objArrayHandle result_h(THREAD, r);
3949
3950 int index = 0;
3951 for (int j = 0; j < num_flags; j++, index++) {
3952 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3953 result_h->obj_at_put(index, h());
3954 }
3955 for (int i = 0; i < num_args; i++, index++) {
3956 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3957 result_h->obj_at_put(index, h());
3958 }
3959 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3960 JVM_END
3961
3962 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3963 return os::get_signal_number(name);
3964 JVM_END
3965