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/instanceKlass.hpp"
60 #include "oops/klass.inline.hpp"
61 #include "oops/method.hpp"
62 #include "oops/recordComponent.hpp"
63 #include "oops/objArrayKlass.hpp"
64 #include "oops/objArrayOop.inline.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "prims/jvm_misc.hpp"
67 #include "prims/jvmtiExport.hpp"
68 #include "prims/jvmtiThreadState.inline.hpp"
69 #include "prims/stackwalk.hpp"
70 #include "runtime/arguments.hpp"
71 #include "runtime/atomic.hpp"
72 #include "runtime/continuation.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/javaThread.hpp"
82 #include "runtime/jfieldIDWorkaround.hpp"
83 #include "runtime/jniHandles.inline.hpp"
84 #include "runtime/os.inline.hpp"
85 #include "runtime/osThread.hpp"
86 #include "runtime/perfData.hpp"
87 #include "runtime/reflection.hpp"
88 #include "runtime/synchronizer.hpp"
89 #include "runtime/threadIdentifier.hpp"
90 #include "runtime/threadSMR.hpp"
91 #include "runtime/vframe.inline.hpp"
92 #include "runtime/vmOperations.hpp"
93 #include "runtime/vm_version.hpp"
94 #include "services/attachListener.hpp"
95 #include "services/management.hpp"
96 #include "services/threadService.hpp"
97 #include "utilities/copy.hpp"
98 #include "utilities/defaultStream.hpp"
99 #include "utilities/dtrace.hpp"
100 #include "utilities/events.hpp"
101 #include "utilities/macros.hpp"
102 #include "utilities/utf8.hpp"
103 #if INCLUDE_CDS
104 #include "classfile/systemDictionaryShared.hpp"
105 #endif
106 #if INCLUDE_JFR
107 #include "jfr/jfr.hpp"
108 #endif
109 #if INCLUDE_MANAGEMENT
110 #include "services/finalizerService.hpp"
111 #endif
112
113 #include <errno.h>
114
115 /*
116 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
117 such ctors and calls MUST NOT come between an oop declaration/init and its
118 usage because if objects are move this may cause various memory stomps, bus
119 errors and segfaults. Here is a cookbook for causing so called "naked oop
120 failures":
121
122 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
123 // Object address to be held directly in mirror & not visible to GC
124 oop mirror = JNIHandles::resolve_non_null(ofClass);
125
126 // If this ctor can hit a safepoint, moving objects around, then
127 ComplexConstructor foo;
128
129 // Boom! mirror may point to JUNK instead of the intended object
130 (some dereference of mirror)
131
132 // Here's another call that may block for GC, making mirror stale
133 MutexLocker ml(some_lock);
134
135 // And here's an initializer that can result in a stale oop
136 // all in one step.
137 oop o = call_that_can_throw_exception(TRAPS);
138
139
140 The solution is to keep the oop declaration BELOW the ctor or function
141 call that might cause a GC, do another resolve to reassign the oop, or
142 consider use of a Handle instead of an oop so there is immunity from object
143 motion. But note that the "QUICK" entries below do not have a handlemark
144 and thus can only support use of handles passed in.
145 */
146
147 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
148 ResourceMark rm;
149 int line_number = -1;
150 const char * source_file = NULL;
151 const char * trace = "explicit";
152 InstanceKlass* caller = NULL;
153 JavaThread* jthread = THREAD;
154 if (jthread->has_last_Java_frame()) {
155 vframeStream vfst(jthread);
156
157 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
158 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
159 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
160 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
161 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
162
163 Method* last_caller = NULL;
164
165 while (!vfst.at_end()) {
166 Method* m = vfst.method();
167 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
168 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
169 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
170 break;
171 }
172 last_caller = m;
173 vfst.next();
174 }
175 // if this is called from Class.forName0 and that is called from Class.forName,
176 // then print the caller of Class.forName. If this is Class.loadClass, then print
177 // that caller, otherwise keep quiet since this should be picked up elsewhere.
178 bool found_it = false;
179 if (!vfst.at_end() &&
180 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
181 vfst.method()->name() == vmSymbols::forName0_name()) {
182 vfst.next();
183 if (!vfst.at_end() &&
184 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
185 vfst.method()->name() == vmSymbols::forName_name()) {
186 vfst.next();
187 found_it = true;
188 }
189 } else if (last_caller != NULL &&
190 last_caller->method_holder()->name() ==
191 vmSymbols::java_lang_ClassLoader() &&
192 last_caller->name() == vmSymbols::loadClass_name()) {
193 found_it = true;
194 } else if (!vfst.at_end()) {
195 if (vfst.method()->is_native()) {
196 // JNI call
197 found_it = true;
198 }
199 }
200 if (found_it && !vfst.at_end()) {
201 // found the caller
202 caller = vfst.method()->method_holder();
203 line_number = vfst.method()->line_number_from_bci(vfst.bci());
204 if (line_number == -1) {
205 // show method name if it's a native method
206 trace = vfst.method()->name_and_sig_as_C_string();
207 }
208 Symbol* s = caller->source_file_name();
209 if (s != NULL) {
210 source_file = s->as_C_string();
211 }
212 }
213 }
214 if (caller != NULL) {
215 if (to_class != caller) {
216 const char * from = caller->external_name();
217 const char * to = to_class->external_name();
218 // print in a single call to reduce interleaving between threads
219 if (source_file != NULL) {
220 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
221 } else {
222 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
223 }
224 }
225 }
226 }
227
228 void trace_class_resolution(Klass* to_class) {
229 EXCEPTION_MARK;
230 trace_class_resolution_impl(to_class, THREAD);
231 if (HAS_PENDING_EXCEPTION) {
232 CLEAR_PENDING_EXCEPTION;
233 }
234 }
235
236 // java.lang.System //////////////////////////////////////////////////////////////////////
237
238
239 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
240 return os::javaTimeMillis();
241 JVM_END
242
243 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
244 return os::javaTimeNanos();
245 JVM_END
246
247 // The function below is actually exposed by jdk.internal.misc.VM and not
248 // java.lang.System, but we choose to keep it here so that it stays next
249 // to JVM_CurrentTimeMillis and JVM_NanoTime
250
251 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
252 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
253
254 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
255 jlong seconds;
256 jlong nanos;
257
258 os::javaTimeSystemUTC(seconds, nanos);
259
260 // We're going to verify that the result can fit in a long.
261 // For that we need the difference in seconds between 'seconds'
262 // and 'offset_secs' to be such that:
263 // |seconds - offset_secs| < (2^63/10^9)
264 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
265 // which makes |seconds - offset_secs| < 2^33
266 // and we will prefer +/- 2^32 as the maximum acceptable diff
267 // as 2^32 has a more natural feel than 2^33...
268 //
269 // So if |seconds - offset_secs| >= 2^32 - we return a special
270 // sentinel value (-1) which the caller should take as an
271 // exception value indicating that the offset given to us is
272 // too far from range of the current time - leading to too big
273 // a nano adjustment. The caller is expected to recover by
274 // computing a more accurate offset and calling this method
275 // again. (For the record 2^32 secs is ~136 years, so that
276 // should rarely happen)
277 //
278 jlong diff = seconds - offset_secs;
279 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
280 return -1; // sentinel value: the offset is too far off the target
281 }
282
283 // return the adjustment. If you compute a time by adding
284 // this number of nanoseconds along with the number of seconds
285 // in the offset you should get the current UTC time.
286 return (diff * (jlong)1000000000) + nanos;
287 JVM_END
288
289 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
290 jobject dst, jint dst_pos, jint length))
291 // Check if we have null pointers
292 if (src == NULL || dst == NULL) {
293 THROW(vmSymbols::java_lang_NullPointerException());
294 }
295 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
296 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
297 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
298 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
299 // Do copy
300 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
301 JVM_END
302
303
304 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
305 JavaValue r(T_OBJECT);
306 // public synchronized Object put(Object key, Object value);
307 HandleMark hm(THREAD);
308 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
309 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
310 JavaCalls::call_virtual(&r,
311 props,
312 vmClasses::Properties_klass(),
313 vmSymbols::put_name(),
314 vmSymbols::object_object_object_signature(),
315 key_str,
316 value_str,
317 THREAD);
318 }
319
320
321 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
322
323 /*
324 * Return all of the system properties in a Java String array with alternating
325 * names and values from the jvm SystemProperty.
326 * Which includes some internal and all commandline -D defined properties.
327 */
328 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
329 ResourceMark rm(THREAD);
330 HandleMark hm(THREAD);
331 int ndx = 0;
332 int fixedCount = 2;
333
334 SystemProperty* p = Arguments::system_properties();
335 int count = Arguments::PropertyList_count(p);
336
337 // Allocate result String array
338 InstanceKlass* ik = vmClasses::String_klass();
339 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
340 objArrayHandle result_h(THREAD, r);
341
342 while (p != NULL) {
343 const char * key = p->key();
344 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
345 const char * value = p->value();
346 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
347 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
348 result_h->obj_at_put(ndx * 2, key_str());
349 result_h->obj_at_put(ndx * 2 + 1, value_str());
350 ndx++;
351 }
352 p = p->next();
353 }
354
355 // Convert the -XX:MaxDirectMemorySize= command line flag
356 // to the sun.nio.MaxDirectMemorySize property.
357 // Do this after setting user properties to prevent people
358 // from setting the value with a -D option, as requested.
359 // Leave empty if not supplied
360 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
361 char as_chars[256];
362 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
363 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
364 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
365 result_h->obj_at_put(ndx * 2, key_str());
366 result_h->obj_at_put(ndx * 2 + 1, value_str());
367 ndx++;
368 }
369
370 // JVM monitoring and management support
371 // Add the sun.management.compiler property for the compiler's name
372 {
373 #undef CSIZE
374 #if defined(_LP64) || defined(_WIN64)
375 #define CSIZE "64-Bit "
376 #else
377 #define CSIZE
378 #endif // 64bit
379
380 #if COMPILER1_AND_COMPILER2
381 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
382 #else
383 #if defined(COMPILER1)
384 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
385 #elif defined(COMPILER2)
386 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
387 #elif INCLUDE_JVMCI
388 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
389 #else
390 const char* compiler_name = "";
391 #endif // compilers
392 #endif // COMPILER1_AND_COMPILER2
393
394 if (*compiler_name != '\0' &&
395 (Arguments::mode() != Arguments::_int)) {
396 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
397 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
398 result_h->obj_at_put(ndx * 2, key_str());
399 result_h->obj_at_put(ndx * 2 + 1, value_str());
400 ndx++;
401 }
402 }
403
404 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
405 JVM_END
406
407
408 /*
409 * Return the temporary directory that the VM uses for the attach
410 * and perf data files.
411 *
412 * It is important that this directory is well-known and the
413 * same for all VM instances. It cannot be affected by configuration
414 * variables such as java.io.tmpdir.
415 */
416 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
417 HandleMark hm(THREAD);
418 const char* temp_dir = os::get_temp_directory();
419 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
420 return (jstring) JNIHandles::make_local(THREAD, h());
421 JVM_END
422
423
424 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
425
426 extern volatile jint vm_created;
427
428 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
429 #if INCLUDE_CDS
430 // Link all classes for dynamic CDS dumping before vm exit.
431 if (DynamicArchive::should_dump_at_vm_exit()) {
432 DynamicArchive::prepare_for_dump_at_exit();
433 }
434 #endif
435 EventShutdown event;
436 if (event.should_commit()) {
437 event.set_reason("Shutdown requested from Java");
438 event.commit();
439 }
440 JVM_END
441
442
443 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
444 before_exit(thread, true);
445 vm_exit(code);
446 JVM_END
447
448
449 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
450 if (!DisableExplicitGC) {
451 EventSystemGC event;
452 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
453 Universe::heap()->collect(GCCause::_java_lang_system_gc);
454 event.commit();
455 }
456 JVM_END
457
458
459 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
460 return Universe::heap()->millis_since_last_whole_heap_examined();
461 JVM_END
462
463
464 static inline jlong convert_size_t_to_jlong(size_t val) {
465 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
466 NOT_LP64 (return (jlong)val;)
467 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
468 }
469
470 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
471 size_t n = Universe::heap()->capacity();
472 return convert_size_t_to_jlong(n);
473 JVM_END
474
475
476 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
477 size_t n = Universe::heap()->unused();
478 return convert_size_t_to_jlong(n);
479 JVM_END
480
481
482 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
483 size_t n = Universe::heap()->max_capacity();
484 return convert_size_t_to_jlong(n);
485 JVM_END
486
487
488 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
489 return os::active_processor_count();
490 JVM_END
491
492 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
493 #ifdef LINUX
494 if (UseContainerSupport) {
495 return JNI_TRUE;
496 }
497 #endif
498 return JNI_FALSE;
499 JVM_END
500
501 // java.lang.Throwable //////////////////////////////////////////////////////
502
503 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
504 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
505 java_lang_Throwable::fill_in_stack_trace(exception);
506 JVM_END
507
508 // java.lang.NullPointerException ///////////////////////////////////////////
509
510 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
511 if (!ShowCodeDetailsInExceptionMessages) return NULL;
512
513 oop exc = JNIHandles::resolve_non_null(throwable);
514
515 Method* method;
516 int bci;
517 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
518 return NULL;
519 }
520 if (method->is_native()) {
521 return NULL;
522 }
523
524 stringStream ss;
525 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
526 if (ok) {
527 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
528 return (jstring) JNIHandles::make_local(THREAD, result);
529 } else {
530 return NULL;
531 }
532 JVM_END
533
534 // java.lang.StackTraceElement //////////////////////////////////////////////
535
536
537 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
538 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
539 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
540 objArrayHandle stack_trace(THREAD, st);
541 // Fill in the allocated stack trace
542 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
543 JVM_END
544
545
546 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
547 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
548 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
549 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
550 JVM_END
551
552
553 // java.lang.StackWalker //////////////////////////////////////////////////////
554
555
556 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
557 jint skip_frames, jobject contScope, jobject cont,
558 jint frame_count, jint start_index, jobjectArray frames))
559 if (!thread->has_last_Java_frame()) {
560 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
561 }
562
563 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
564 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
565 Handle cont_h(THREAD, JNIHandles::resolve(cont));
566 // frames array is a Class<?>[] array when only getting caller reference,
567 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
568 // be null.
569 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
570 objArrayHandle frames_array_h(THREAD, fa);
571
572 int limit = start_index + frame_count;
573 if (frames_array_h->length() < limit) {
574 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
575 }
576
577 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
578 frame_count, start_index, frames_array_h, CHECK_NULL);
579 return JNIHandles::make_local(THREAD, result);
580 JVM_END
581
582
583 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
584 jint frame_count, jint start_index,
585 jobjectArray frames))
586 // frames array is a Class<?>[] array when only getting caller reference,
587 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
588 // be null.
589 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
590 objArrayHandle frames_array_h(THREAD, fa);
591
592 int limit = start_index+frame_count;
593 if (frames_array_h->length() < limit) {
594 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
595 }
596
597 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
598 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
599 start_index, frames_array_h, THREAD);
600 JVM_END
601
602 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
603 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
604 objArrayHandle frames_array_h(THREAD, fa);
605 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
606 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
607
608 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
609 JVM_END
610
611 // java.lang.Object ///////////////////////////////////////////////
612
613
614 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
615 // as implemented in the classic virtual machine; return 0 if object is NULL
616 return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
617 JVM_END
618
619
620 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
621 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
622 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
623 if (JvmtiExport::should_post_monitor_wait()) {
624 JvmtiExport::post_monitor_wait(thread, obj(), ms);
625
626 // The current thread already owns the monitor and it has not yet
627 // been added to the wait queue so the current thread cannot be
628 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
629 // event handler cannot accidentally consume an unpark() meant for
630 // the ParkEvent associated with this ObjectMonitor.
631 }
632 ObjectSynchronizer::wait(obj, ms, CHECK);
633 JVM_END
634
635
636 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
637 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
638 ObjectSynchronizer::notify(obj, CHECK);
639 JVM_END
640
641
642 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
643 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
644 ObjectSynchronizer::notifyall(obj, CHECK);
645 JVM_END
646
647
648 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
649 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
650 Klass* klass = obj->klass();
651 JvmtiVMObjectAllocEventCollector oam;
652
653 #ifdef ASSERT
654 // Just checking that the cloneable flag is set correct
655 if (obj->is_array()) {
656 guarantee(klass->is_cloneable(), "all arrays are cloneable");
657 } else {
658 guarantee(obj->is_instance(), "should be instanceOop");
659 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
660 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
661 }
662 #endif
663
664 // Check if class of obj supports the Cloneable interface.
665 // All arrays are considered to be cloneable (See JLS 20.1.5).
666 // All j.l.r.Reference classes are considered non-cloneable.
667 if (!klass->is_cloneable() ||
668 (klass->is_instance_klass() &&
669 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
670 ResourceMark rm(THREAD);
671 THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
672 }
673
674 // Make shallow object copy
675 const size_t size = obj->size();
676 oop new_obj_oop = NULL;
677 if (obj->is_array()) {
678 const int length = ((arrayOop)obj())->length();
679 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
680 /* do_zero */ true, CHECK_NULL);
681 } else {
682 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
683 }
684
685 HeapAccess<>::clone(obj(), new_obj_oop, size);
686
687 Handle new_obj(THREAD, new_obj_oop);
688 // Caution: this involves a java upcall, so the clone should be
689 // "gc-robust" by this stage.
690 if (klass->has_finalizer()) {
691 assert(obj->is_instance(), "should be instanceOop");
692 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
693 new_obj = Handle(THREAD, new_obj_oop);
694 }
695
696 return JNIHandles::make_local(THREAD, new_obj());
697 JVM_END
698
699 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
700
701 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
702 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
703 JVM_END
704
705 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
706 return InstanceKlass::is_finalization_enabled();
707 JVM_END
708
709 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
710
711 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
712 CONT_RegisterNativeMethods(env, cls);
713 JVM_END
714
715 // java.io.File ///////////////////////////////////////////////////////////////
716
717 JVM_LEAF(char*, JVM_NativePath(char* path))
718 return os::native_path(path);
719 JVM_END
720
721
722 // Misc. class handling ///////////////////////////////////////////////////////////
723
724
725 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
726 // Getting the class of the caller frame.
727 //
728 // The call stack at this point looks something like this:
729 //
730 // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
731 // [1] [ @CallerSensitive API.method ]
732 // [.] [ (skipped intermediate frames) ]
733 // [n] [ caller ]
734 vframeStream vfst(thread);
735 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
736 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
737 Method* m = vfst.method();
738 assert(m != NULL, "sanity");
739 switch (n) {
740 case 0:
741 // This must only be called from Reflection.getCallerClass
742 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
743 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
744 }
745 // fall-through
746 case 1:
747 // Frame 0 and 1 must be caller sensitive.
748 if (!m->caller_sensitive()) {
749 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
750 }
751 break;
752 default:
753 if (!m->is_ignored_by_security_stack_walk()) {
754 // We have reached the desired frame; return the holder class.
755 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
756 }
757 break;
758 }
759 }
760 return NULL;
761 JVM_END
762
763
764 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
765 oop mirror = NULL;
766 BasicType t = name2type(utf);
767 if (t != T_ILLEGAL && !is_reference_type(t)) {
768 mirror = Universe::java_mirror(t);
769 }
770 if (mirror == NULL) {
771 THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
772 } else {
773 return (jclass) JNIHandles::make_local(THREAD, mirror);
774 }
775 JVM_END
776
777
778 // Returns a class loaded by the bootstrap class loader; or null
779 // if not found. ClassNotFoundException is not thrown.
780 // FindClassFromBootLoader is exported to the launcher for windows.
781 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
782 const char* name))
783 // Java libraries should ensure that name is never null or illegal.
784 if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
785 // It's impossible to create this class; the name cannot fit
786 // into the constant pool.
787 return NULL;
788 }
789 assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
790
791 TempNewSymbol h_name = SymbolTable::new_symbol(name);
792 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
793 if (k == NULL) {
794 return NULL;
795 }
796
797 if (log_is_enabled(Debug, class, resolve)) {
798 trace_class_resolution(k);
799 }
800 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
801 JVM_END
802
803 // Find a class with this name in this loader, using the caller's protection domain.
804 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
805 jboolean init, jobject loader,
806 jclass caller))
807 TempNewSymbol h_name =
808 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
809 CHECK_NULL);
810
811 oop loader_oop = JNIHandles::resolve(loader);
812 oop from_class = JNIHandles::resolve(caller);
813 oop protection_domain = NULL;
814 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
815 // NPE. Put it in another way, the bootstrap class loader has all permission and
816 // thus no checkPackageAccess equivalence in the VM class loader.
817 // The caller is also passed as NULL by the java code if there is no security
818 // manager to avoid the performance cost of getting the calling class.
819 if (from_class != NULL && loader_oop != NULL) {
820 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
821 }
822
823 Handle h_loader(THREAD, loader_oop);
824 Handle h_prot(THREAD, protection_domain);
825 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
826 h_prot, false, THREAD);
827
828 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
829 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
830 }
831 return result;
832 JVM_END
833
834 // Currently only called from the old verifier.
835 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
836 jboolean init, jclass from))
837 TempNewSymbol h_name =
838 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
839 CHECK_NULL);
840 oop from_class_oop = JNIHandles::resolve(from);
841 Klass* from_class = (from_class_oop == NULL)
842 ? (Klass*)NULL
843 : java_lang_Class::as_Klass(from_class_oop);
844 oop class_loader = NULL;
845 oop protection_domain = NULL;
846 if (from_class != NULL) {
847 class_loader = from_class->class_loader();
848 protection_domain = from_class->protection_domain();
849 }
850 Handle h_loader(THREAD, class_loader);
851 Handle h_prot (THREAD, protection_domain);
852 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
853 h_prot, true, thread);
854
855 if (log_is_enabled(Debug, class, resolve) && result != NULL) {
856 // this function is generally only used for class loading during verification.
857 ResourceMark rm;
858 oop from_mirror = JNIHandles::resolve_non_null(from);
859 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
860 const char * from_name = from_class->external_name();
861
862 oop mirror = JNIHandles::resolve_non_null(result);
863 Klass* to_class = java_lang_Class::as_Klass(mirror);
864 const char * to = to_class->external_name();
865 log_debug(class, resolve)("%s %s (verification)", from_name, to);
866 }
867
868 return result;
869 JVM_END
870
871 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
872 static jclass jvm_define_class_common(const char *name,
873 jobject loader, const jbyte *buf,
874 jsize len, jobject pd, const char *source,
875 TRAPS) {
876 if (source == NULL) source = "__JVM_DefineClass__";
877
878 JavaThread* jt = THREAD;
879
880 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
881 ClassLoader::perf_define_appclass_selftime(),
882 ClassLoader::perf_define_appclasses(),
883 jt->get_thread_stat()->perf_recursion_counts_addr(),
884 jt->get_thread_stat()->perf_timers_addr(),
885 PerfClassTraceTime::DEFINE_CLASS);
886
887 if (UsePerfData) {
888 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
889 }
890
891 // Class resolution will get the class name from the .class stream if the name is null.
892 TempNewSymbol class_name = name == NULL ? NULL :
893 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
894 CHECK_NULL);
895
896 ResourceMark rm(THREAD);
897 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
898 Handle class_loader (THREAD, JNIHandles::resolve(loader));
899 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
900 ClassLoadInfo cl_info(protection_domain);
901 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
902 class_loader,
903 cl_info,
904 CHECK_NULL);
905
906 if (log_is_enabled(Debug, class, resolve)) {
907 trace_class_resolution(k);
908 }
909
910 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
911 }
912
913 enum {
914 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
915 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
916 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
917 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
918 };
919
920 /*
921 * Define a class with the specified flags that indicates if it's a nestmate,
922 * hidden, or strongly referenced from class loader.
923 */
924 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
925 const jbyte *buf, jsize len, jobject pd,
926 jboolean init, int flags, jobject classData, TRAPS) {
927 ResourceMark rm(THREAD);
928
929 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
930 // Lookup class must be a non-null instance
931 if (lookup_k == NULL) {
932 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
933 }
934 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
935
936 Handle class_loader (THREAD, lookup_k->class_loader());
937
938 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
939 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
940 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
941 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
942
943 InstanceKlass* host_class = NULL;
944 if (is_nestmate) {
945 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
946 }
947
948 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
949 name,
950 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
951 is_nestmate ? host_class->external_name() : "",
952 is_hidden ? "hidden" : "not hidden",
953 is_strong ? "strong" : "weak",
954 vm_annotations ? "with vm annotations" : "without vm annotation");
955
956 if (!is_hidden) {
957 // classData is only applicable for hidden classes
958 if (classData != NULL) {
959 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
960 }
961 if (is_nestmate) {
962 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
963 }
964 if (!is_strong) {
965 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
966 }
967 if (vm_annotations) {
968 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
969 }
970 if (flags != STRONG_LOADER_LINK) {
971 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
972 err_msg("invalid flag 0x%x", flags));
973 }
974 }
975
976 // Class resolution will get the class name from the .class stream if the name is null.
977 TempNewSymbol class_name = name == NULL ? NULL :
978 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
979 CHECK_NULL);
980
981 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
982 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
983 ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
984
985 InstanceKlass* ik = NULL;
986 if (!is_hidden) {
987 ClassLoadInfo cl_info(protection_domain);
988 ik = SystemDictionary::resolve_from_stream(&st, class_name,
989 class_loader,
990 cl_info,
991 CHECK_NULL);
992
993 if (log_is_enabled(Debug, class, resolve)) {
994 trace_class_resolution(ik);
995 }
996 } else { // hidden
997 Handle classData_h(THREAD, JNIHandles::resolve(classData));
998 ClassLoadInfo cl_info(protection_domain,
999 host_class,
1000 classData_h,
1001 is_hidden,
1002 is_strong,
1003 vm_annotations);
1004 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1005 class_loader,
1006 cl_info,
1007 CHECK_NULL);
1008
1009 // The hidden class loader data has been artificially been kept alive to
1010 // this point. The mirror and any instances of this class have to keep
1011 // it alive afterwards.
1012 ik->class_loader_data()->dec_keep_alive();
1013
1014 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1015 ModuleEntry* module = ik->module();
1016 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1017 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1018 module_name,
1019 ik->external_name(),
1020 host_class->external_name(),
1021 ik->is_hidden() ? "is hidden" : "is not hidden");
1022 }
1023 }
1024 assert(Reflection::is_same_class_package(lookup_k, ik),
1025 "lookup class and defined class are in different packages");
1026
1027 if (init) {
1028 ik->initialize(CHECK_NULL);
1029 } else {
1030 ik->link_class(CHECK_NULL);
1031 }
1032
1033 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1034 }
1035
1036 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1037 return jvm_define_class_common(name, loader, buf, len, pd, NULL, THREAD);
1038 JVM_END
1039
1040 /*
1041 * Define a class with the specified lookup class.
1042 * lookup: Lookup class
1043 * name: the name of the class
1044 * buf: class bytes
1045 * len: length of class bytes
1046 * pd: protection domain
1047 * init: initialize the class
1048 * flags: properties of the class
1049 * classData: private static pre-initialized field
1050 */
1051 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1052 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1053
1054 if (lookup == NULL) {
1055 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1056 }
1057
1058 assert(buf != NULL, "buf must not be NULL");
1059
1060 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1061 JVM_END
1062
1063 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1064
1065 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1066 JVM_END
1067
1068 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1069 ResourceMark rm(THREAD);
1070
1071 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1072 char* str = java_lang_String::as_utf8_string(h_name());
1073
1074 // Sanity check, don't expect null
1075 if (str == NULL) return NULL;
1076
1077 // Internalize the string, converting '.' to '/' in string.
1078 char* p = (char*)str;
1079 while (*p != '\0') {
1080 if (*p == '.') {
1081 *p = '/';
1082 }
1083 p++;
1084 }
1085
1086 const int str_len = (int)(p - str);
1087 if (str_len > Symbol::max_length()) {
1088 // It's impossible to create this class; the name cannot fit
1089 // into the constant pool.
1090 return NULL;
1091 }
1092 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1093
1094 // Security Note:
1095 // The Java level wrapper will perform the necessary security check allowing
1096 // us to pass the NULL as the initiating class loader.
1097 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1098 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1099 h_loader,
1100 Handle());
1101 #if INCLUDE_CDS
1102 if (k == NULL) {
1103 // If the class is not already loaded, try to see if it's in the shared
1104 // archive for the current classloader (h_loader).
1105 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1106 }
1107 #endif
1108 return (k == NULL) ? NULL :
1109 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1110 JVM_END
1111
1112 // Module support //////////////////////////////////////////////////////////////////////////////
1113
1114 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1115 jstring location, jobjectArray packages))
1116 Handle h_module (THREAD, JNIHandles::resolve(module));
1117 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1118 JVM_END
1119
1120 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1121 Handle h_module (THREAD, JNIHandles::resolve(module));
1122 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1123 JVM_END
1124
1125 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1126 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1127 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1128 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1129 JVM_END
1130
1131 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1132 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1133 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1134 JVM_END
1135
1136 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1137 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1138 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1139 JVM_END
1140
1141 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1142 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1143 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1144 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1145 JVM_END
1146
1147 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1148 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1149 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1150 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1151 JVM_END
1152
1153 // Reflection support //////////////////////////////////////////////////////////////////////////////
1154
1155 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1156 assert (cls != NULL, "illegal class");
1157 JvmtiVMObjectAllocEventCollector oam;
1158 ResourceMark rm(THREAD);
1159 HandleMark hm(THREAD);
1160 Handle java_class(THREAD, JNIHandles::resolve(cls));
1161 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1162 return (jstring) JNIHandles::make_local(THREAD, result);
1163 JVM_END
1164
1165
1166 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1167 JvmtiVMObjectAllocEventCollector oam;
1168 oop mirror = JNIHandles::resolve_non_null(cls);
1169
1170 // Special handling for primitive objects
1171 if (java_lang_Class::is_primitive(mirror)) {
1172 // Primitive objects does not have any interfaces
1173 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1174 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1175 }
1176
1177 Klass* klass = java_lang_Class::as_Klass(mirror);
1178 // Figure size of result array
1179 int size;
1180 if (klass->is_instance_klass()) {
1181 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1182 } else {
1183 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1184 size = 2;
1185 }
1186
1187 // Allocate result array
1188 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1189 objArrayHandle result (THREAD, r);
1190 // Fill in result
1191 if (klass->is_instance_klass()) {
1192 // Regular instance klass, fill in all local interfaces
1193 for (int index = 0; index < size; index++) {
1194 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1195 result->obj_at_put(index, k->java_mirror());
1196 }
1197 } else {
1198 // All arrays implement java.lang.Cloneable and java.io.Serializable
1199 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1200 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1201 }
1202 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1203 JVM_END
1204
1205
1206 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1207 oop mirror = JNIHandles::resolve_non_null(cls);
1208 if (java_lang_Class::is_primitive(mirror)) {
1209 return JNI_FALSE;
1210 }
1211 Klass* k = java_lang_Class::as_Klass(mirror);
1212 jboolean result = k->is_interface();
1213 assert(!result || k->is_instance_klass(),
1214 "all interfaces are instance types");
1215 // The compiler intrinsic for isInterface tests the
1216 // Klass::_access_flags bits in the same way.
1217 return result;
1218 JVM_END
1219
1220 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1221 oop mirror = JNIHandles::resolve_non_null(cls);
1222 if (java_lang_Class::is_primitive(mirror)) {
1223 return JNI_FALSE;
1224 }
1225 Klass* k = java_lang_Class::as_Klass(mirror);
1226 return k->is_hidden();
1227 JVM_END
1228
1229 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1230 JvmtiVMObjectAllocEventCollector oam;
1231 oop mirror = JNIHandles::resolve_non_null(cls);
1232 if (java_lang_Class::is_primitive(mirror)) {
1233 // There are no signers for primitive types
1234 return NULL;
1235 }
1236
1237 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1238
1239 // If there are no signers set in the class, or if the class
1240 // is an array, return NULL.
1241 if (signers == NULL) return NULL;
1242
1243 // copy of the signers array
1244 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1245 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1246 for (int index = 0; index < signers->length(); index++) {
1247 signers_copy->obj_at_put(index, signers->obj_at(index));
1248 }
1249
1250 // return the copy
1251 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1252 JVM_END
1253
1254
1255 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1256 oop mirror = JNIHandles::resolve_non_null(cls);
1257 if (!java_lang_Class::is_primitive(mirror)) {
1258 // This call is ignored for primitive types and arrays.
1259 // Signers are only set once, ClassLoader.java, and thus shouldn't
1260 // be called with an array. Only the bootstrap loader creates arrays.
1261 Klass* k = java_lang_Class::as_Klass(mirror);
1262 if (k->is_instance_klass()) {
1263 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1264 }
1265 }
1266 JVM_END
1267
1268
1269 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1270 oop mirror = JNIHandles::resolve_non_null(cls);
1271 if (mirror == NULL) {
1272 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1273 }
1274
1275 if (java_lang_Class::is_primitive(mirror)) {
1276 // Primitive types does not have a protection domain.
1277 return NULL;
1278 }
1279
1280 oop pd = java_lang_Class::protection_domain(mirror);
1281 return (jobject) JNIHandles::make_local(THREAD, pd);
1282 JVM_END
1283
1284
1285 // Returns the inherited_access_control_context field of the running thread.
1286 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1287 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1288 return JNIHandles::make_local(THREAD, result);
1289 JVM_END
1290
1291 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1292 if (!UsePrivilegedStack) return NULL;
1293
1294 ResourceMark rm(THREAD);
1295 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1296 JvmtiVMObjectAllocEventCollector oam;
1297
1298 // count the protection domains on the execution stack. We collapse
1299 // duplicate consecutive protection domains into a single one, as
1300 // well as stopping when we hit a privileged frame.
1301
1302 oop previous_protection_domain = NULL;
1303 Handle privileged_context(thread, NULL);
1304 bool is_privileged = false;
1305 oop protection_domain = NULL;
1306
1307 // Iterate through Java frames
1308 vframeStream vfst(thread);
1309 for(; !vfst.at_end(); vfst.next()) {
1310 // get method of frame
1311 Method* method = vfst.method();
1312
1313 // stop at the first privileged frame
1314 if (method->method_holder() == vmClasses::AccessController_klass() &&
1315 method->name() == vmSymbols::executePrivileged_name())
1316 {
1317 // this frame is privileged
1318 is_privileged = true;
1319
1320 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1321
1322 StackValueCollection* locals = priv->locals();
1323 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1324 StackValue* clr_sv = locals->at(2); // Class<?> caller
1325 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1326 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1327 privileged_context = ctx_sv->get_obj();
1328 Handle caller = clr_sv->get_obj();
1329
1330 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1331 protection_domain = caller_klass->protection_domain();
1332 } else {
1333 protection_domain = method->method_holder()->protection_domain();
1334 }
1335
1336 if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1337 local_array->push(Handle(thread, protection_domain));
1338 previous_protection_domain = protection_domain;
1339 }
1340
1341 if (is_privileged) break;
1342 }
1343
1344
1345 // either all the domains on the stack were system domains, or
1346 // we had a privileged system domain
1347 if (local_array->is_empty()) {
1348 if (is_privileged && privileged_context.is_null()) return NULL;
1349
1350 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1351 return JNIHandles::make_local(THREAD, result);
1352 }
1353
1354 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1355 local_array->length(), CHECK_NULL);
1356 objArrayHandle h_context(thread, context);
1357 for (int index = 0; index < local_array->length(); index++) {
1358 h_context->obj_at_put(index, local_array->at(index)());
1359 }
1360
1361 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1362
1363 return JNIHandles::make_local(THREAD, result);
1364 JVM_END
1365
1366
1367 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1368 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1369 return (k != NULL) && k->is_array_klass() ? true : false;
1370 JVM_END
1371
1372
1373 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1374 oop mirror = JNIHandles::resolve_non_null(cls);
1375 return (jboolean) java_lang_Class::is_primitive(mirror);
1376 JVM_END
1377
1378
1379 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1380 oop mirror = JNIHandles::resolve_non_null(cls);
1381 if (java_lang_Class::is_primitive(mirror)) {
1382 // Primitive type
1383 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1384 }
1385
1386 Klass* k = java_lang_Class::as_Klass(mirror);
1387 debug_only(int computed_modifiers = k->compute_modifier_flags());
1388 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1389 return k->modifier_flags();
1390 JVM_END
1391
1392
1393 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1394
1395 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1396 JvmtiVMObjectAllocEventCollector oam;
1397 // ofClass is a reference to a java_lang_Class object. The mirror object
1398 // of an InstanceKlass
1399 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1400 if (java_lang_Class::is_primitive(ofMirror) ||
1401 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1402 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1403 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1404 }
1405
1406 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1407 InnerClassesIterator iter(k);
1408
1409 if (iter.length() == 0) {
1410 // Neither an inner nor outer class
1411 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1412 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1413 }
1414
1415 // find inner class info
1416 constantPoolHandle cp(thread, k->constants());
1417 int length = iter.length();
1418
1419 // Allocate temp. result array
1420 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1421 objArrayHandle result (THREAD, r);
1422 int members = 0;
1423
1424 for (; !iter.done(); iter.next()) {
1425 int ioff = iter.inner_class_info_index();
1426 int ooff = iter.outer_class_info_index();
1427
1428 if (ioff != 0 && ooff != 0) {
1429 // Check to see if the name matches the class we're looking for
1430 // before attempting to find the class.
1431 if (cp->klass_name_at_matches(k, ooff)) {
1432 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1433 if (outer_klass == k) {
1434 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1435 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1436
1437 // Throws an exception if outer klass has not declared k as
1438 // an inner klass
1439 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1440
1441 result->obj_at_put(members, inner_klass->java_mirror());
1442 members++;
1443 }
1444 }
1445 }
1446 }
1447
1448 if (members != length) {
1449 // Return array of right length
1450 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1451 for(int i = 0; i < members; i++) {
1452 res->obj_at_put(i, result->obj_at(i));
1453 }
1454 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1455 }
1456
1457 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1458 JVM_END
1459
1460
1461 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1462 {
1463 // ofClass is a reference to a java_lang_Class object.
1464 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1465 if (java_lang_Class::is_primitive(ofMirror)) {
1466 return NULL;
1467 }
1468 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1469 if (!klass->is_instance_klass()) {
1470 return NULL;
1471 }
1472
1473 bool inner_is_member = false;
1474 Klass* outer_klass
1475 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1476 if (outer_klass == NULL) return NULL; // already a top-level class
1477 if (!inner_is_member) return NULL; // a hidden class (inside a method)
1478 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1479 }
1480 JVM_END
1481
1482 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1483 {
1484 oop mirror = JNIHandles::resolve_non_null(cls);
1485 if (java_lang_Class::is_primitive(mirror)) {
1486 return NULL;
1487 }
1488 Klass* klass = java_lang_Class::as_Klass(mirror);
1489 if (!klass->is_instance_klass()) {
1490 return NULL;
1491 }
1492 InstanceKlass* k = InstanceKlass::cast(klass);
1493 int ooff = 0, noff = 0;
1494 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1495 if (noff != 0) {
1496 constantPoolHandle i_cp(thread, k->constants());
1497 Symbol* name = i_cp->symbol_at(noff);
1498 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1499 return (jstring) JNIHandles::make_local(THREAD, str());
1500 }
1501 }
1502 return NULL;
1503 }
1504 JVM_END
1505
1506 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1507 assert (cls != NULL, "illegal class");
1508 JvmtiVMObjectAllocEventCollector oam;
1509 ResourceMark rm(THREAD);
1510 oop mirror = JNIHandles::resolve_non_null(cls);
1511 // Return null for arrays and primitives
1512 if (!java_lang_Class::is_primitive(mirror)) {
1513 Klass* k = java_lang_Class::as_Klass(mirror);
1514 if (k->is_instance_klass()) {
1515 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1516 if (sym == NULL) return NULL;
1517 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1518 return (jstring) JNIHandles::make_local(THREAD, str());
1519 }
1520 }
1521 return NULL;
1522 JVM_END
1523
1524
1525 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1526 assert (cls != NULL, "illegal class");
1527 oop mirror = JNIHandles::resolve_non_null(cls);
1528 // Return null for arrays and primitives
1529 if (!java_lang_Class::is_primitive(mirror)) {
1530 Klass* k = java_lang_Class::as_Klass(mirror);
1531 if (k->is_instance_klass()) {
1532 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1533 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1534 }
1535 }
1536 return NULL;
1537 JVM_END
1538
1539
1540 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1541 // some of this code was adapted from from jni_FromReflectedField
1542
1543 oop reflected = JNIHandles::resolve_non_null(field);
1544 oop mirror = java_lang_reflect_Field::clazz(reflected);
1545 Klass* k = java_lang_Class::as_Klass(mirror);
1546 int slot = java_lang_reflect_Field::slot(reflected);
1547 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1548
1549 InstanceKlass* ik = InstanceKlass::cast(k);
1550 intptr_t offset = ik->field_offset(slot);
1551
1552 if (modifiers & JVM_ACC_STATIC) {
1553 // for static fields we only look in the current class
1554 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1555 assert(false, "cannot find static field");
1556 return false;
1557 }
1558 } else {
1559 // for instance fields we start with the current class and work
1560 // our way up through the superclass chain
1561 if (!ik->find_field_from_offset(offset, false, &fd)) {
1562 assert(false, "cannot find instance field");
1563 return false;
1564 }
1565 }
1566 return true;
1567 }
1568
1569 static Method* jvm_get_method_common(jobject method) {
1570 // some of this code was adapted from from jni_FromReflectedMethod
1571
1572 oop reflected = JNIHandles::resolve_non_null(method);
1573 oop mirror = NULL;
1574 int slot = 0;
1575
1576 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1577 mirror = java_lang_reflect_Constructor::clazz(reflected);
1578 slot = java_lang_reflect_Constructor::slot(reflected);
1579 } else {
1580 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1581 "wrong type");
1582 mirror = java_lang_reflect_Method::clazz(reflected);
1583 slot = java_lang_reflect_Method::slot(reflected);
1584 }
1585 Klass* k = java_lang_Class::as_Klass(mirror);
1586
1587 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1588 assert(m != NULL, "cannot find method");
1589 return m; // caller has to deal with NULL in product mode
1590 }
1591
1592 /* Type use annotations support (JDK 1.8) */
1593
1594 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1595 assert (cls != NULL, "illegal class");
1596 ResourceMark rm(THREAD);
1597 // Return null for arrays and primitives
1598 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1599 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1600 if (k->is_instance_klass()) {
1601 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1602 if (type_annotations != NULL) {
1603 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1604 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1605 }
1606 }
1607 }
1608 return NULL;
1609 JVM_END
1610
1611 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1612 assert (method != NULL, "illegal method");
1613 // method is a handle to a java.lang.reflect.Method object
1614 Method* m = jvm_get_method_common(method);
1615 if (m == NULL) {
1616 return NULL;
1617 }
1618
1619 AnnotationArray* type_annotations = m->type_annotations();
1620 if (type_annotations != NULL) {
1621 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1622 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1623 }
1624
1625 return NULL;
1626 JVM_END
1627
1628 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1629 assert (field != NULL, "illegal field");
1630 fieldDescriptor fd;
1631 bool gotFd = jvm_get_field_common(field, fd);
1632 if (!gotFd) {
1633 return NULL;
1634 }
1635
1636 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1637 JVM_END
1638
1639 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1640 if (!cp->is_within_bounds(index)) {
1641 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1642 }
1643 }
1644
1645 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1646 {
1647 // method is a handle to a java.lang.reflect.Method object
1648 Method* method_ptr = jvm_get_method_common(method);
1649 methodHandle mh (THREAD, method_ptr);
1650 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1651 const int num_params = mh->method_parameters_length();
1652
1653 if (num_params < 0) {
1654 // A -1 return value from method_parameters_length means there is no
1655 // parameter data. Return null to indicate this to the reflection
1656 // API.
1657 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1658 return (jobjectArray)NULL;
1659 } else {
1660 // Otherwise, we return something up to reflection, even if it is
1661 // a zero-length array. Why? Because in some cases this can
1662 // trigger a MalformedParametersException.
1663
1664 // make sure all the symbols are properly formatted
1665 for (int i = 0; i < num_params; i++) {
1666 MethodParametersElement* params = mh->method_parameters_start();
1667 int index = params[i].name_cp_index;
1668 constantPoolHandle cp(THREAD, mh->constants());
1669 bounds_check(cp, index, CHECK_NULL);
1670
1671 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1672 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1673 "Wrong type at constant pool index");
1674 }
1675
1676 }
1677
1678 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1679 objArrayHandle result (THREAD, result_oop);
1680
1681 for (int i = 0; i < num_params; i++) {
1682 MethodParametersElement* params = mh->method_parameters_start();
1683 // For a 0 index, give a NULL symbol
1684 Symbol* sym = 0 != params[i].name_cp_index ?
1685 mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1686 int flags = params[i].flags;
1687 oop param = Reflection::new_parameter(reflected_method, i, sym,
1688 flags, CHECK_NULL);
1689 result->obj_at_put(i, param);
1690 }
1691 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1692 }
1693 }
1694 JVM_END
1695
1696 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1697
1698 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1699 {
1700 JvmtiVMObjectAllocEventCollector oam;
1701
1702 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1703 // Exclude primitive types and array types
1704 if (java_lang_Class::is_primitive(ofMirror) ||
1705 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1706 // Return empty array
1707 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1708 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1709 }
1710
1711 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1712 constantPoolHandle cp(THREAD, k->constants());
1713
1714 // Ensure class is linked
1715 k->link_class(CHECK_NULL);
1716
1717 // Allocate result
1718 int num_fields;
1719
1720 if (publicOnly) {
1721 num_fields = 0;
1722 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1723 if (fs.access_flags().is_public()) ++num_fields;
1724 }
1725 } else {
1726 num_fields = k->java_fields_count();
1727 }
1728
1729 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1730 objArrayHandle result (THREAD, r);
1731
1732 int out_idx = 0;
1733 fieldDescriptor fd;
1734 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1735 if (!publicOnly || fs.access_flags().is_public()) {
1736 fd.reinitialize(k, fs.index());
1737 oop field = Reflection::new_field(&fd, CHECK_NULL);
1738 result->obj_at_put(out_idx, field);
1739 ++out_idx;
1740 }
1741 }
1742 assert(out_idx == num_fields, "just checking");
1743 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1744 }
1745 JVM_END
1746
1747 // A class is a record if and only if it is final and a direct subclass of
1748 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1749 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1750 {
1751 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1752 if (k != NULL && k->is_instance_klass()) {
1753 InstanceKlass* ik = InstanceKlass::cast(k);
1754 return ik->is_record();
1755 } else {
1756 return false;
1757 }
1758 }
1759 JVM_END
1760
1761 // Returns an array containing the components of the Record attribute,
1762 // or NULL if the attribute is not present.
1763 //
1764 // Note that this function returns the components of the Record attribute
1765 // even if the class is not a record.
1766 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1767 {
1768 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1769 assert(c->is_instance_klass(), "must be");
1770 InstanceKlass* ik = InstanceKlass::cast(c);
1771
1772 Array<RecordComponent*>* components = ik->record_components();
1773 if (components != NULL) {
1774 JvmtiVMObjectAllocEventCollector oam;
1775 constantPoolHandle cp(THREAD, ik->constants());
1776 int length = components->length();
1777 assert(length >= 0, "unexpected record_components length");
1778 objArrayOop record_components =
1779 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1780 objArrayHandle components_h (THREAD, record_components);
1781
1782 for (int x = 0; x < length; x++) {
1783 RecordComponent* component = components->at(x);
1784 assert(component != NULL, "unexpected NULL record component");
1785 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1786 components_h->obj_at_put(x, component_oop);
1787 }
1788 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1789 }
1790
1791 return NULL;
1792 }
1793 JVM_END
1794
1795 static bool select_method(const methodHandle& method, bool want_constructor) {
1796 if (want_constructor) {
1797 return (method->is_initializer() && !method->is_static());
1798 } else {
1799 return (!method->is_initializer() && !method->is_overpass());
1800 }
1801 }
1802
1803 static jobjectArray get_class_declared_methods_helper(
1804 JNIEnv *env,
1805 jclass ofClass, jboolean publicOnly,
1806 bool want_constructor,
1807 Klass* klass, TRAPS) {
1808
1809 JvmtiVMObjectAllocEventCollector oam;
1810
1811 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1812 // Exclude primitive types and array types
1813 if (java_lang_Class::is_primitive(ofMirror)
1814 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1815 // Return empty array
1816 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1817 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1818 }
1819
1820 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1821
1822 // Ensure class is linked
1823 k->link_class(CHECK_NULL);
1824
1825 Array<Method*>* methods = k->methods();
1826 int methods_length = methods->length();
1827
1828 // Save original method_idnum in case of redefinition, which can change
1829 // the idnum of obsolete methods. The new method will have the same idnum
1830 // but if we refresh the methods array, the counts will be wrong.
1831 ResourceMark rm(THREAD);
1832 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1833 int num_methods = 0;
1834
1835 for (int i = 0; i < methods_length; i++) {
1836 methodHandle method(THREAD, methods->at(i));
1837 if (select_method(method, want_constructor)) {
1838 if (!publicOnly || method->is_public()) {
1839 idnums->push(method->method_idnum());
1840 ++num_methods;
1841 }
1842 }
1843 }
1844
1845 // Allocate result
1846 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1847 objArrayHandle result (THREAD, r);
1848
1849 // Now just put the methods that we selected above, but go by their idnum
1850 // in case of redefinition. The methods can be redefined at any safepoint,
1851 // so above when allocating the oop array and below when creating reflect
1852 // objects.
1853 for (int i = 0; i < num_methods; i++) {
1854 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1855 if (method.is_null()) {
1856 // Method may have been deleted and seems this API can handle null
1857 // Otherwise should probably put a method that throws NSME
1858 result->obj_at_put(i, NULL);
1859 } else {
1860 oop m;
1861 if (want_constructor) {
1862 m = Reflection::new_constructor(method, CHECK_NULL);
1863 } else {
1864 m = Reflection::new_method(method, false, CHECK_NULL);
1865 }
1866 result->obj_at_put(i, m);
1867 }
1868 }
1869
1870 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1871 }
1872
1873 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1874 {
1875 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1876 /*want_constructor*/ false,
1877 vmClasses::reflect_Method_klass(), THREAD);
1878 }
1879 JVM_END
1880
1881 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1882 {
1883 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1884 /*want_constructor*/ true,
1885 vmClasses::reflect_Constructor_klass(), THREAD);
1886 }
1887 JVM_END
1888
1889 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1890 {
1891 oop mirror = JNIHandles::resolve_non_null(cls);
1892 if (java_lang_Class::is_primitive(mirror)) {
1893 // Primitive type
1894 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1895 }
1896
1897 Klass* k = java_lang_Class::as_Klass(mirror);
1898 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1899 }
1900 JVM_END
1901
1902 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1903 {
1904 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1905 assert(c->is_instance_klass(), "must be");
1906 InstanceKlass* ck = InstanceKlass::cast(c);
1907 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1908 assert(m->is_instance_klass(), "must be");
1909 InstanceKlass* mk = InstanceKlass::cast(m);
1910 return ck->has_nestmate_access_to(mk, THREAD);
1911 }
1912 JVM_END
1913
1914 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1915 {
1916 // current is not a primitive or array class
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 InstanceKlass* host = ck->nest_host(THREAD);
1921 return (jclass) (host == NULL ? NULL :
1922 JNIHandles::make_local(THREAD, host->java_mirror()));
1923 }
1924 JVM_END
1925
1926 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1927 {
1928 // current is not a primitive or array class
1929 ResourceMark rm(THREAD);
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
1935 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1936 ck->external_name(), host->external_name());
1937 {
1938 JvmtiVMObjectAllocEventCollector oam;
1939 Array<u2>* members = host->nest_members();
1940 int length = members == NULL ? 0 : members->length();
1941
1942 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1943
1944 // nest host is first in the array so make it one bigger
1945 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1946 length + 1, CHECK_NULL);
1947 objArrayHandle result(THREAD, r);
1948 result->obj_at_put(0, host->java_mirror());
1949 if (length != 0) {
1950 int count = 0;
1951 for (int i = 0; i < length; i++) {
1952 int cp_index = members->at(i);
1953 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1954 if (HAS_PENDING_EXCEPTION) {
1955 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1956 return NULL; // propagate VMEs
1957 }
1958 if (log_is_enabled(Trace, class, nestmates)) {
1959 stringStream ss;
1960 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1961 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1962 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1963 log_trace(class, nestmates)("%s", ss.as_string());
1964 }
1965 CLEAR_PENDING_EXCEPTION;
1966 continue;
1967 }
1968 if (k->is_instance_klass()) {
1969 InstanceKlass* ik = InstanceKlass::cast(k);
1970 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1971 if (nest_host_k == host) {
1972 result->obj_at_put(count+1, k->java_mirror());
1973 count++;
1974 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1975 } else {
1976 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1977 ik->external_name(), nest_host_k->external_name());
1978 }
1979 } else {
1980 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1981 k->external_name());
1982 }
1983 }
1984 if (count < length) {
1985 // we had invalid entries so we need to compact the array
1986 log_trace(class, nestmates)(" - compacting array from length %d to %d",
1987 length + 1, count + 1);
1988
1989 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1990 count + 1, CHECK_NULL);
1991 objArrayHandle result2(THREAD, r2);
1992 for (int i = 0; i < count + 1; i++) {
1993 result2->obj_at_put(i, result->obj_at(i));
1994 }
1995 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1996 }
1997 }
1998 else {
1999 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2000 }
2001 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2002 }
2003 }
2004 JVM_END
2005
2006 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2007 {
2008 oop mirror = JNIHandles::resolve_non_null(current);
2009 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2010 Klass* c = java_lang_Class::as_Klass(mirror);
2011 assert(c->is_instance_klass(), "must be");
2012 InstanceKlass* ik = InstanceKlass::cast(c);
2013 ResourceMark rm(THREAD);
2014 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2015 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2016 if (ik->is_sealed()) {
2017 JvmtiVMObjectAllocEventCollector oam;
2018 Array<u2>* subclasses = ik->permitted_subclasses();
2019 int length = subclasses->length();
2020
2021 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2022
2023 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2024 length, CHECK_NULL);
2025 objArrayHandle result(THREAD, r);
2026 int count = 0;
2027 for (int i = 0; i < length; i++) {
2028 int cp_index = subclasses->at(i);
2029 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2030 if (HAS_PENDING_EXCEPTION) {
2031 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2032 return NULL; // propagate VMEs
2033 }
2034 if (log_is_enabled(Trace, class, sealed)) {
2035 stringStream ss;
2036 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2037 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2038 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2039 log_trace(class, sealed)("%s", ss.as_string());
2040 }
2041
2042 CLEAR_PENDING_EXCEPTION;
2043 continue;
2044 }
2045 if (k->is_instance_klass()) {
2046 result->obj_at_put(count++, k->java_mirror());
2047 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2048 }
2049 }
2050 if (count < length) {
2051 // we had invalid entries so we need to compact the array
2052 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2053 count, CHECK_NULL);
2054 objArrayHandle result2(THREAD, r2);
2055 for (int i = 0; i < count; i++) {
2056 result2->obj_at_put(i, result->obj_at(i));
2057 }
2058 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2059 }
2060 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2061 } else {
2062 return NULL;
2063 }
2064 }
2065 JVM_END
2066
2067 // Constant pool access //////////////////////////////////////////////////////////
2068
2069 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2070 {
2071 JvmtiVMObjectAllocEventCollector oam;
2072 oop mirror = JNIHandles::resolve_non_null(cls);
2073 // Return null for primitives and arrays
2074 if (!java_lang_Class::is_primitive(mirror)) {
2075 Klass* k = java_lang_Class::as_Klass(mirror);
2076 if (k->is_instance_klass()) {
2077 InstanceKlass* k_h = InstanceKlass::cast(k);
2078 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2079 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2080 return JNIHandles::make_local(THREAD, jcp());
2081 }
2082 }
2083 return NULL;
2084 }
2085 JVM_END
2086
2087
2088 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2089 {
2090 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2091 return cp->length();
2092 }
2093 JVM_END
2094
2095
2096 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2097 {
2098 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2099 bounds_check(cp, index, CHECK_NULL);
2100 constantTag tag = cp->tag_at(index);
2101 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2102 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2103 }
2104 Klass* k = cp->klass_at(index, CHECK_NULL);
2105 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2106 }
2107 JVM_END
2108
2109 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(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 = ConstantPool::klass_at_if_loaded(cp, index);
2118 if (k == NULL) return NULL;
2119 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2120 }
2121 JVM_END
2122
2123 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2124 constantTag tag = cp->tag_at(index);
2125 if (!tag.is_method() && !tag.is_interface_method()) {
2126 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2127 }
2128 int klass_ref = cp->uncached_klass_ref_index_at(index);
2129 Klass* k_o;
2130 if (force_resolution) {
2131 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2132 } else {
2133 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2134 if (k_o == NULL) return NULL;
2135 }
2136 InstanceKlass* k = InstanceKlass::cast(k_o);
2137 Symbol* name = cp->uncached_name_ref_at(index);
2138 Symbol* sig = cp->uncached_signature_ref_at(index);
2139 methodHandle m (THREAD, k->find_method(name, sig));
2140 if (m.is_null()) {
2141 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2142 }
2143 oop method;
2144 if (!m->is_initializer() || m->is_static()) {
2145 method = Reflection::new_method(m, true, CHECK_NULL);
2146 } else {
2147 method = Reflection::new_constructor(m, CHECK_NULL);
2148 }
2149 return JNIHandles::make_local(THREAD, method);
2150 }
2151
2152 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2153 {
2154 JvmtiVMObjectAllocEventCollector oam;
2155 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2156 bounds_check(cp, index, CHECK_NULL);
2157 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2158 return res;
2159 }
2160 JVM_END
2161
2162 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2163 {
2164 JvmtiVMObjectAllocEventCollector oam;
2165 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2166 bounds_check(cp, index, CHECK_NULL);
2167 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2168 return res;
2169 }
2170 JVM_END
2171
2172 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2173 constantTag tag = cp->tag_at(index);
2174 if (!tag.is_field()) {
2175 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2176 }
2177 int klass_ref = cp->uncached_klass_ref_index_at(index);
2178 Klass* k_o;
2179 if (force_resolution) {
2180 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2181 } else {
2182 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2183 if (k_o == NULL) return NULL;
2184 }
2185 InstanceKlass* k = InstanceKlass::cast(k_o);
2186 Symbol* name = cp->uncached_name_ref_at(index);
2187 Symbol* sig = cp->uncached_signature_ref_at(index);
2188 fieldDescriptor fd;
2189 Klass* target_klass = k->find_field(name, sig, &fd);
2190 if (target_klass == NULL) {
2191 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2192 }
2193 oop field = Reflection::new_field(&fd, CHECK_NULL);
2194 return JNIHandles::make_local(THREAD, field);
2195 }
2196
2197 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2198 {
2199 JvmtiVMObjectAllocEventCollector oam;
2200 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2201 bounds_check(cp, index, CHECK_NULL);
2202 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2203 return res;
2204 }
2205 JVM_END
2206
2207 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2208 {
2209 JvmtiVMObjectAllocEventCollector oam;
2210 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2211 bounds_check(cp, index, CHECK_NULL);
2212 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2213 return res;
2214 }
2215 JVM_END
2216
2217 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2218 {
2219 JvmtiVMObjectAllocEventCollector oam;
2220 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2221 bounds_check(cp, index, CHECK_NULL);
2222 constantTag tag = cp->tag_at(index);
2223 if (!tag.is_field_or_method()) {
2224 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2225 }
2226 int klass_ref = cp->uncached_klass_ref_index_at(index);
2227 Symbol* klass_name = cp->klass_name_at(klass_ref);
2228 Symbol* member_name = cp->uncached_name_ref_at(index);
2229 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2230 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2231 objArrayHandle dest(THREAD, dest_o);
2232 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2233 dest->obj_at_put(0, str());
2234 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2235 dest->obj_at_put(1, str());
2236 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2237 dest->obj_at_put(2, str());
2238 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2239 }
2240 JVM_END
2241
2242 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2243 {
2244 JvmtiVMObjectAllocEventCollector oam;
2245 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2246 bounds_check(cp, index, CHECK_0);
2247 constantTag tag = cp->tag_at(index);
2248 if (!tag.is_field_or_method()) {
2249 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2250 }
2251 return (jint) cp->uncached_klass_ref_index_at(index);
2252 }
2253 JVM_END
2254
2255 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(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_invoke_dynamic() && !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_name_and_type_ref_index_at(index);
2265 }
2266 JVM_END
2267
2268 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(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_NULL);
2273 constantTag tag = cp->tag_at(index);
2274 if (!tag.is_name_and_type()) {
2275 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2276 }
2277 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2278 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2279 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2280 objArrayHandle dest(THREAD, dest_o);
2281 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2282 dest->obj_at_put(0, str());
2283 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2284 dest->obj_at_put(1, str());
2285 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2286 }
2287 JVM_END
2288
2289 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2290 {
2291 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2292 bounds_check(cp, index, CHECK_0);
2293 constantTag tag = cp->tag_at(index);
2294 if (!tag.is_int()) {
2295 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2296 }
2297 return cp->int_at(index);
2298 }
2299 JVM_END
2300
2301 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2302 {
2303 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2304 bounds_check(cp, index, CHECK_(0L));
2305 constantTag tag = cp->tag_at(index);
2306 if (!tag.is_long()) {
2307 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2308 }
2309 return cp->long_at(index);
2310 }
2311 JVM_END
2312
2313 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2314 {
2315 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2316 bounds_check(cp, index, CHECK_(0.0f));
2317 constantTag tag = cp->tag_at(index);
2318 if (!tag.is_float()) {
2319 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2320 }
2321 return cp->float_at(index);
2322 }
2323 JVM_END
2324
2325 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2326 {
2327 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2328 bounds_check(cp, index, CHECK_(0.0));
2329 constantTag tag = cp->tag_at(index);
2330 if (!tag.is_double()) {
2331 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2332 }
2333 return cp->double_at(index);
2334 }
2335 JVM_END
2336
2337 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2338 {
2339 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2340 bounds_check(cp, index, CHECK_NULL);
2341 constantTag tag = cp->tag_at(index);
2342 if (!tag.is_string()) {
2343 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2344 }
2345 oop str = cp->string_at(index, CHECK_NULL);
2346 return (jstring) JNIHandles::make_local(THREAD, str);
2347 }
2348 JVM_END
2349
2350 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2351 {
2352 JvmtiVMObjectAllocEventCollector oam;
2353 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2354 bounds_check(cp, index, CHECK_NULL);
2355 constantTag tag = cp->tag_at(index);
2356 if (!tag.is_symbol()) {
2357 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2358 }
2359 Symbol* sym = cp->symbol_at(index);
2360 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2361 return (jstring) JNIHandles::make_local(THREAD, str());
2362 }
2363 JVM_END
2364
2365 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2366 {
2367 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2368 bounds_check(cp, index, CHECK_0);
2369 constantTag tag = cp->tag_at(index);
2370 jbyte result = tag.value();
2371 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2372 // they are changed to the corresponding tags from the JVM spec, so that java code in
2373 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2374 if (tag.is_klass_or_reference()) {
2375 result = JVM_CONSTANT_Class;
2376 } else if (tag.is_string_index()) {
2377 result = JVM_CONSTANT_String;
2378 } else if (tag.is_method_type_in_error()) {
2379 result = JVM_CONSTANT_MethodType;
2380 } else if (tag.is_method_handle_in_error()) {
2381 result = JVM_CONSTANT_MethodHandle;
2382 } else if (tag.is_dynamic_constant_in_error()) {
2383 result = JVM_CONSTANT_Dynamic;
2384 }
2385 return result;
2386 }
2387 JVM_END
2388
2389 // Assertion support. //////////////////////////////////////////////////////////
2390
2391 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2392 assert(cls != NULL, "bad class");
2393
2394 oop r = JNIHandles::resolve(cls);
2395 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2396 if (java_lang_Class::is_primitive(r)) return false;
2397
2398 Klass* k = java_lang_Class::as_Klass(r);
2399 assert(k->is_instance_klass(), "must be an instance klass");
2400 if (!k->is_instance_klass()) return false;
2401
2402 ResourceMark rm(THREAD);
2403 const char* name = k->name()->as_C_string();
2404 bool system_class = k->class_loader() == NULL;
2405 return JavaAssertions::enabled(name, system_class);
2406
2407 JVM_END
2408
2409
2410 // Return a new AssertionStatusDirectives object with the fields filled in with
2411 // command-line assertion arguments (i.e., -ea, -da).
2412 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2413 JvmtiVMObjectAllocEventCollector oam;
2414 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2415 return JNIHandles::make_local(THREAD, asd);
2416 JVM_END
2417
2418 // Verification ////////////////////////////////////////////////////////////////////////////////
2419
2420 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2421
2422 // RedefineClasses support: bug 6214132 caused verification to fail.
2423 // All functions from this section should call the jvmtiThreadSate function:
2424 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2425 // The function returns a Klass* of the _scratch_class if the verifier
2426 // was invoked in the middle of the class redefinition.
2427 // Otherwise it returns its argument value which is the _the_class Klass*.
2428 // Please, refer to the description in the jvmtiThreadSate.hpp.
2429
2430 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2431 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2432 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2433 return k->name()->as_utf8();
2434 JVM_END
2435
2436
2437 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2438 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2439 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2440 // types will have length zero if this is not an InstanceKlass
2441 // (length is determined by call to JVM_GetClassCPEntriesCount)
2442 if (k->is_instance_klass()) {
2443 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2444 for (int index = cp->length() - 1; index >= 0; index--) {
2445 constantTag tag = cp->tag_at(index);
2446 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2447 }
2448 }
2449 JVM_END
2450
2451
2452 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2453 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2454 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2455 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2456 JVM_END
2457
2458
2459 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2460 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2461 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2462 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2463 JVM_END
2464
2465
2466 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2467 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2468 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2469 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2470 JVM_END
2471
2472
2473 // The following methods, used for the verifier, are never called with
2474 // array klasses, so a direct cast to InstanceKlass is safe.
2475 // Typically, these methods are called in a loop with bounds determined
2476 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2477 // zero for arrays.
2478 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2479 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2480 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2481 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2482 int length = method->checked_exceptions_length();
2483 if (length > 0) {
2484 CheckedExceptionElement* table= method->checked_exceptions_start();
2485 for (int i = 0; i < length; i++) {
2486 exceptions[i] = table[i].class_cp_index;
2487 }
2488 }
2489 JVM_END
2490
2491
2492 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2493 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2494 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2495 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2496 return method->checked_exceptions_length();
2497 JVM_END
2498
2499
2500 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2501 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2502 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2503 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2504 memcpy(code, method->code_base(), method->code_size());
2505 JVM_END
2506
2507
2508 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2509 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2510 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2511 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2512 return method->code_size();
2513 JVM_END
2514
2515
2516 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2517 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2518 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2519 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2520 ExceptionTable extable(method);
2521 entry->start_pc = extable.start_pc(entry_index);
2522 entry->end_pc = extable.end_pc(entry_index);
2523 entry->handler_pc = extable.handler_pc(entry_index);
2524 entry->catchType = extable.catch_type_index(entry_index);
2525 JVM_END
2526
2527
2528 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
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 return method->exception_table_length();
2533 JVM_END
2534
2535
2536 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2537 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2538 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2539 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2540 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2541 JVM_END
2542
2543
2544 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2545 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2546 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2547 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2548 JVM_END
2549
2550
2551 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2552 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2553 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2554 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2555 return method->max_locals();
2556 JVM_END
2557
2558
2559 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2560 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2561 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2562 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2563 return method->size_of_parameters();
2564 JVM_END
2565
2566
2567 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2568 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2569 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2570 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2571 return method->verifier_max_stack();
2572 JVM_END
2573
2574
2575 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2576 ResourceMark rm(THREAD);
2577 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2578 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2579 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2580 return method->name() == vmSymbols::object_initializer_name();
2581 JVM_END
2582
2583
2584 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2585 ResourceMark rm(THREAD);
2586 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2587 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2588 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2589 return method->is_overpass();
2590 JVM_END
2591
2592 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2593 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2594 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2595 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2596 return method->name()->as_utf8();
2597 JVM_END
2598
2599
2600 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2601 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2602 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2603 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2604 return method->signature()->as_utf8();
2605 JVM_END
2606
2607 /**
2608 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2609 * read entries in the constant pool. Since the old verifier always
2610 * works on a copy of the code, it will not see any rewriting that
2611 * may possibly occur in the middle of verification. So it is important
2612 * that nothing it calls tries to use the cpCache instead of the raw
2613 * constant pool, so we must use cp->uncached_x methods when appropriate.
2614 */
2615 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2616 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2617 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2618 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2619 switch (cp->tag_at(cp_index).value()) {
2620 case JVM_CONSTANT_Fieldref:
2621 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2622 default:
2623 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2624 }
2625 ShouldNotReachHere();
2626 return NULL;
2627 JVM_END
2628
2629
2630 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2631 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2632 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2633 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2634 switch (cp->tag_at(cp_index).value()) {
2635 case JVM_CONSTANT_InterfaceMethodref:
2636 case JVM_CONSTANT_Methodref:
2637 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2638 default:
2639 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2640 }
2641 ShouldNotReachHere();
2642 return NULL;
2643 JVM_END
2644
2645
2646 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2647 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2648 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2649 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2650 switch (cp->tag_at(cp_index).value()) {
2651 case JVM_CONSTANT_InterfaceMethodref:
2652 case JVM_CONSTANT_Methodref:
2653 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2654 default:
2655 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2656 }
2657 ShouldNotReachHere();
2658 return NULL;
2659 JVM_END
2660
2661
2662 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2663 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2664 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2665 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2666 switch (cp->tag_at(cp_index).value()) {
2667 case JVM_CONSTANT_Fieldref:
2668 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2669 default:
2670 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2671 }
2672 ShouldNotReachHere();
2673 return NULL;
2674 JVM_END
2675
2676
2677 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2678 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2679 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2680 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2681 Symbol* classname = cp->klass_name_at(cp_index);
2682 return classname->as_utf8();
2683 JVM_END
2684
2685
2686 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2687 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2688 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2689 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2690 switch (cp->tag_at(cp_index).value()) {
2691 case JVM_CONSTANT_Fieldref: {
2692 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2693 Symbol* classname = cp->klass_name_at(class_index);
2694 return classname->as_utf8();
2695 }
2696 default:
2697 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2698 }
2699 ShouldNotReachHere();
2700 return NULL;
2701 JVM_END
2702
2703
2704 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2705 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2706 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2707 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2708 switch (cp->tag_at(cp_index).value()) {
2709 case JVM_CONSTANT_Methodref:
2710 case JVM_CONSTANT_InterfaceMethodref: {
2711 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2712 Symbol* classname = cp->klass_name_at(class_index);
2713 return classname->as_utf8();
2714 }
2715 default:
2716 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2717 }
2718 ShouldNotReachHere();
2719 return NULL;
2720 JVM_END
2721
2722
2723 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2724 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2725 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2726 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2727 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2728 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2729 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2730 switch (cp->tag_at(cp_index).value()) {
2731 case JVM_CONSTANT_Fieldref: {
2732 Symbol* name = cp->uncached_name_ref_at(cp_index);
2733 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2734 InstanceKlass* ik = InstanceKlass::cast(k_called);
2735 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2736 if (fs.name() == name && fs.signature() == signature) {
2737 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2738 }
2739 }
2740 return -1;
2741 }
2742 default:
2743 fatal("JVM_GetCPFieldModifiers: illegal constant");
2744 }
2745 ShouldNotReachHere();
2746 return 0;
2747 JVM_END
2748
2749
2750 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2751 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2752 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2753 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2754 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2755 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2756 switch (cp->tag_at(cp_index).value()) {
2757 case JVM_CONSTANT_Methodref:
2758 case JVM_CONSTANT_InterfaceMethodref: {
2759 Symbol* name = cp->uncached_name_ref_at(cp_index);
2760 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2761 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2762 int methods_count = methods->length();
2763 for (int i = 0; i < methods_count; i++) {
2764 Method* method = methods->at(i);
2765 if (method->name() == name && method->signature() == signature) {
2766 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2767 }
2768 }
2769 return -1;
2770 }
2771 default:
2772 fatal("JVM_GetCPMethodModifiers: illegal constant");
2773 }
2774 ShouldNotReachHere();
2775 return 0;
2776 JVM_END
2777
2778
2779 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2780
2781 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2782 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2783 JVM_END
2784
2785
2786 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2787 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2788 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2789 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2790 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2791 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2792 JVM_END
2793
2794 // Printing support //////////////////////////////////////////////////
2795 extern "C" {
2796
2797 ATTRIBUTE_PRINTF(3, 0)
2798 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2799 // Reject count values that are negative signed values converted to
2800 // unsigned; see bug 4399518, 4417214
2801 if ((intptr_t)count <= 0) return -1;
2802
2803 int result = os::vsnprintf(str, count, fmt, args);
2804 if (result > 0 && (size_t)result >= count) {
2805 result = -1;
2806 }
2807
2808 return result;
2809 }
2810
2811 ATTRIBUTE_PRINTF(3, 4)
2812 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2813 va_list args;
2814 int len;
2815 va_start(args, fmt);
2816 len = jio_vsnprintf(str, count, fmt, args);
2817 va_end(args);
2818 return len;
2819 }
2820
2821 ATTRIBUTE_PRINTF(2, 3)
2822 int jio_fprintf(FILE* f, const char *fmt, ...) {
2823 int len;
2824 va_list args;
2825 va_start(args, fmt);
2826 len = jio_vfprintf(f, fmt, args);
2827 va_end(args);
2828 return len;
2829 }
2830
2831 ATTRIBUTE_PRINTF(2, 0)
2832 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2833 if (Arguments::vfprintf_hook() != NULL) {
2834 return Arguments::vfprintf_hook()(f, fmt, args);
2835 } else {
2836 return vfprintf(f, fmt, args);
2837 }
2838 }
2839
2840 ATTRIBUTE_PRINTF(1, 2)
2841 JNIEXPORT int jio_printf(const char *fmt, ...) {
2842 int len;
2843 va_list args;
2844 va_start(args, fmt);
2845 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2846 va_end(args);
2847 return len;
2848 }
2849
2850 // HotSpot specific jio method
2851 void jio_print(const char* s, size_t len) {
2852 // Try to make this function as atomic as possible.
2853 if (Arguments::vfprintf_hook() != NULL) {
2854 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2855 } else {
2856 // Make an unused local variable to avoid warning from gcc compiler.
2857 ssize_t count = os::write(defaultStream::output_fd(), s, (int)len);
2858 }
2859 }
2860
2861 } // Extern C
2862
2863 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2864
2865 // In most of the JVM thread support functions we need to access the
2866 // thread through a ThreadsListHandle to prevent it from exiting and
2867 // being reclaimed while we try to operate on it. The exceptions to this
2868 // rule are when operating on the current thread, or if the monitor of
2869 // the target java.lang.Thread is locked at the Java level - in both
2870 // cases the target cannot exit.
2871
2872 static void thread_entry(JavaThread* thread, TRAPS) {
2873 HandleMark hm(THREAD);
2874 Handle obj(THREAD, thread->threadObj());
2875 JavaValue result(T_VOID);
2876 JavaCalls::call_virtual(&result,
2877 obj,
2878 vmClasses::Thread_klass(),
2879 vmSymbols::run_method_name(),
2880 vmSymbols::void_method_signature(),
2881 THREAD);
2882 }
2883
2884
2885 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2886 #if INCLUDE_CDS
2887 if (DumpSharedSpaces) {
2888 // During java -Xshare:dump, if we allow multiple Java threads to
2889 // execute in parallel, symbols and classes may be loaded in
2890 // random orders which will make the resulting CDS archive
2891 // non-deterministic.
2892 //
2893 // Lucikly, during java -Xshare:dump, it's important to run only
2894 // the code in the main Java thread (which is NOT started here) that
2895 // creates the module graph, etc. It's safe to not start the other
2896 // threads which are launched by class static initializers
2897 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2898 if (log_is_enabled(Info, cds)) {
2899 ResourceMark rm;
2900 oop t = JNIHandles::resolve_non_null(jthread);
2901 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2902 }
2903 return;
2904 }
2905 #endif
2906 JavaThread *native_thread = NULL;
2907
2908 // We cannot hold the Threads_lock when we throw an exception,
2909 // due to rank ordering issues. Example: we might need to grab the
2910 // Heap_lock while we construct the exception.
2911 bool throw_illegal_thread_state = false;
2912
2913 // We must release the Threads_lock before we can post a jvmti event
2914 // in Thread::start.
2915 {
2916 // Ensure that the C++ Thread and OSThread structures aren't freed before
2917 // we operate.
2918 MutexLocker mu(Threads_lock);
2919
2920 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2921 // re-starting an already started thread, so we should usually find
2922 // that the JavaThread is null. However for a JNI attached thread
2923 // there is a small window between the Thread object being created
2924 // (with its JavaThread set) and the update to its threadStatus, so we
2925 // have to check for this
2926 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2927 throw_illegal_thread_state = true;
2928 } else {
2929 jlong size =
2930 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2931 // Allocate the C++ Thread structure and create the native thread. The
2932 // stack size retrieved from java is 64-bit signed, but the constructor takes
2933 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2934 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2935 // - Avoid passing negative values which would result in really large stacks.
2936 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2937 size_t sz = size > 0 ? (size_t) size : 0;
2938 native_thread = new JavaThread(&thread_entry, sz);
2939
2940 // At this point it may be possible that no osthread was created for the
2941 // JavaThread due to lack of memory. Check for this situation and throw
2942 // an exception if necessary. Eventually we may want to change this so
2943 // that we only grab the lock if the thread was created successfully -
2944 // then we can also do this check and throw the exception in the
2945 // JavaThread constructor.
2946 if (native_thread->osthread() != NULL) {
2947 // Note: the current thread is not being used within "prepare".
2948 native_thread->prepare(jthread);
2949 }
2950 }
2951 }
2952
2953 if (throw_illegal_thread_state) {
2954 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2955 }
2956
2957 assert(native_thread != NULL, "Starting null thread?");
2958
2959 if (native_thread->osthread() == NULL) {
2960 ResourceMark rm(thread);
2961 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2962 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2963 // No one should hold a reference to the 'native_thread'.
2964 native_thread->smr_delete();
2965 if (JvmtiExport::should_post_resource_exhausted()) {
2966 JvmtiExport::post_resource_exhausted(
2967 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2968 os::native_thread_creation_failed_msg());
2969 }
2970 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2971 os::native_thread_creation_failed_msg());
2972 }
2973
2974 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2975
2976 Thread::start(native_thread);
2977
2978 JVM_END
2979
2980
2981 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
2982 oop thread_oop = JNIHandles::resolve_non_null(jthread);
2983 return java_lang_Thread::is_alive(thread_oop);
2984 JVM_END
2985
2986
2987 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2988 ThreadsListHandle tlh(thread);
2989 oop java_thread = NULL;
2990 JavaThread* receiver = NULL;
2991 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2992 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2993
2994 if (is_alive) {
2995 // jthread refers to a live JavaThread.
2996 Thread::set_priority(receiver, (ThreadPriority)prio);
2997 }
2998 // Implied else: If the JavaThread hasn't started yet, then the
2999 // priority set in the java.lang.Thread object above will be pushed
3000 // down when it does start.
3001 JVM_END
3002
3003
3004 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3005 if (os::dont_yield()) return;
3006 HOTSPOT_THREAD_YIELD();
3007 os::naked_yield();
3008 JVM_END
3009
3010 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3011 if (millis < 0) {
3012 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3013 }
3014
3015 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3016 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3017 }
3018
3019 // Save current thread state and restore it at the end of this block.
3020 // And set new thread state to SLEEPING.
3021 JavaThreadSleepState jtss(thread);
3022
3023 HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3024
3025 if (millis == 0) {
3026 os::naked_yield();
3027 } else {
3028 ThreadState old_state = thread->osthread()->get_state();
3029 thread->osthread()->set_state(SLEEPING);
3030 if (!thread->sleep(millis)) { // interrupted
3031 // An asynchronous exception could have been thrown on
3032 // us while we were sleeping. We do not overwrite those.
3033 if (!HAS_PENDING_EXCEPTION) {
3034 HOTSPOT_THREAD_SLEEP_END(1);
3035
3036 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3037 // to properly restore the thread state. That's likely wrong.
3038 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3039 }
3040 }
3041 thread->osthread()->set_state(old_state);
3042 }
3043 HOTSPOT_THREAD_SLEEP_END(0);
3044 JVM_END
3045
3046 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3047 oop jthread = thread->threadObj();
3048 assert(jthread != NULL, "no current carrier thread!");
3049 return JNIHandles::make_local(THREAD, jthread);
3050 JVM_END
3051
3052 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3053 oop theThread = thread->vthread();
3054 assert(theThread != (oop)NULL, "no current thread!");
3055 return JNIHandles::make_local(THREAD, theThread);
3056 JVM_END
3057
3058 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3059 jobject theThread))
3060 oop threadObj = JNIHandles::resolve(theThread);
3061 thread->set_vthread(threadObj);
3062 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3063 JVM_END
3064
3065 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3066 return ThreadIdentifier::unsafe_offset();
3067 JVM_END
3068
3069 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3070 ThreadsListHandle tlh(thread);
3071 JavaThread* receiver = NULL;
3072 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3073 if (is_alive) {
3074 // jthread refers to a live JavaThread.
3075 receiver->interrupt();
3076 }
3077 JVM_END
3078
3079 // Return true iff the current thread has locked the object passed in
3080
3081 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3082 if (obj == NULL) {
3083 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3084 }
3085 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3086 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3087 JVM_END
3088
3089 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3090 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3091 return JNIHandles::make_local(THREAD, trace);
3092 JVM_END
3093
3094 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3095 VM_PrintThreads op;
3096 VMThread::execute(&op);
3097 if (JvmtiExport::should_post_data_dump()) {
3098 JvmtiExport::post_data_dump();
3099 }
3100 JVM_END
3101
3102 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3103 // We don't use a ThreadsListHandle here because the current thread
3104 // must be alive.
3105 oop java_thread = JNIHandles::resolve_non_null(jthread);
3106 JavaThread* thr = java_lang_Thread::thread(java_thread);
3107 if (thread == thr && !thr->has_attached_via_jni()) {
3108 // Thread naming is only supported for the current thread and
3109 // we don't set the name of an attached thread to avoid stepping
3110 // on other programs.
3111 ResourceMark rm(thread);
3112 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3113 os::set_native_thread_name(thread_name);
3114 }
3115 JVM_END
3116
3117 JVM_ENTRY(jobject, JVM_ExtentLocalCache(JNIEnv* env, jclass threadClass))
3118 oop theCache = thread->extentLocalCache();
3119 if (theCache) {
3120 arrayOop objs = arrayOop(theCache);
3121 assert(objs->length() == ExtentLocalCacheSize * 2, "wrong length");
3122 }
3123 return JNIHandles::make_local(THREAD, theCache);
3124 JVM_END
3125
3126 JVM_ENTRY(void, JVM_SetExtentLocalCache(JNIEnv* env, jclass threadClass,
3127 jobject theCache))
3128 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3129 if (objs != NULL) {
3130 assert(objs->length() == ExtentLocalCacheSize * 2, "wrong length");
3131 }
3132 thread->set_extentLocalCache(objs);
3133 JVM_END
3134
3135 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3136
3137 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3138 ResourceMark rm(THREAD);
3139 JvmtiVMObjectAllocEventCollector oam;
3140 vframeStream vfst(thread);
3141
3142 if (vmClasses::reflect_CallerSensitive_klass() != NULL) {
3143 // This must only be called from SecurityManager.getClassContext
3144 Method* m = vfst.method();
3145 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3146 m->name() == vmSymbols::getClassContext_name() &&
3147 m->signature() == vmSymbols::void_class_array_signature())) {
3148 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3149 }
3150 }
3151
3152 // Collect method holders
3153 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3154 for (; !vfst.at_end(); vfst.security_next()) {
3155 Method* m = vfst.method();
3156 // Native frames are not returned
3157 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3158 Klass* holder = m->method_holder();
3159 assert(holder->is_klass(), "just checking");
3160 klass_array->append(holder);
3161 }
3162 }
3163
3164 // Create result array of type [Ljava/lang/Class;
3165 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3166 // Fill in mirrors corresponding to method holders
3167 for (int i = 0; i < klass_array->length(); i++) {
3168 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3169 }
3170
3171 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3172 JVM_END
3173
3174
3175 // java.lang.Package ////////////////////////////////////////////////////////////////
3176
3177
3178 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3179 ResourceMark rm(THREAD);
3180 JvmtiVMObjectAllocEventCollector oam;
3181 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3182 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3183 return (jstring) JNIHandles::make_local(THREAD, result);
3184 JVM_END
3185
3186
3187 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3188 JvmtiVMObjectAllocEventCollector oam;
3189 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3190 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3191 JVM_END
3192
3193
3194 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3195
3196
3197 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3198 MonitorLocker ml(Heap_lock);
3199 oop ref = Universe::reference_pending_list();
3200 if (ref != NULL) {
3201 Universe::clear_reference_pending_list();
3202 }
3203 return JNIHandles::make_local(THREAD, ref);
3204 JVM_END
3205
3206 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3207 MonitorLocker ml(Heap_lock);
3208 return Universe::has_reference_pending_list();
3209 JVM_END
3210
3211 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3212 MonitorLocker ml(Heap_lock);
3213 while (!Universe::has_reference_pending_list()) {
3214 ml.wait();
3215 }
3216 JVM_END
3217
3218 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3219 oop ref_oop = JNIHandles::resolve_non_null(ref);
3220 // PhantomReference has it's own implementation of refersTo().
3221 // See: JVM_PhantomReferenceRefersTo
3222 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3223 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3224 return referent == JNIHandles::resolve(o);
3225 JVM_END
3226
3227 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3228 oop ref_oop = JNIHandles::resolve_non_null(ref);
3229 // FinalReference has it's own implementation of clear().
3230 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3231 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == NULL) {
3232 // If the referent has already been cleared then done.
3233 // However, if the referent is dead but has not yet been cleared by
3234 // concurrent reference processing, it should NOT be cleared here.
3235 // Instead, clearing should be left to the GC. Clearing it here could
3236 // detectably lose an expected notification, which is impossible with
3237 // STW reference processing. The clearing in enqueue() doesn't have
3238 // this problem, since the enqueue covers the notification, but it's not
3239 // worth the effort to handle that case specially.
3240 return;
3241 }
3242 java_lang_ref_Reference::clear_referent(ref_oop);
3243 JVM_END
3244
3245
3246 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3247
3248
3249 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3250 oop ref_oop = JNIHandles::resolve_non_null(ref);
3251 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3252 return referent == JNIHandles::resolve(o);
3253 JVM_END
3254
3255
3256 // ObjectInputStream ///////////////////////////////////////////////////////////////
3257
3258 // Return the first user-defined class loader up the execution stack, or null
3259 // if only code from the bootstrap or platform class loader is on the stack.
3260
3261 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3262 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3263 InstanceKlass* ik = vfst.method()->method_holder();
3264 oop loader = ik->class_loader();
3265 if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3266 // Skip reflection related frames
3267 if (!ik->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass()) &&
3268 !ik->is_subclass_of(vmClasses::reflect_ConstructorAccessorImpl_klass())) {
3269 return JNIHandles::make_local(THREAD, loader);
3270 }
3271 }
3272 }
3273 return NULL;
3274 JVM_END
3275
3276
3277 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3278
3279
3280 // resolve array handle and check arguments
3281 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3282 if (arr == NULL) {
3283 THROW_0(vmSymbols::java_lang_NullPointerException());
3284 }
3285 oop a = JNIHandles::resolve_non_null(arr);
3286 if (!a->is_array()) {
3287 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3288 } else if (type_array_only && !a->is_typeArray()) {
3289 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3290 }
3291 return arrayOop(a);
3292 }
3293
3294
3295 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3296 arrayOop a = check_array(env, arr, false, CHECK_0);
3297 return a->length();
3298 JVM_END
3299
3300
3301 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3302 JvmtiVMObjectAllocEventCollector oam;
3303 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3304 jvalue value;
3305 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3306 oop box = Reflection::box(&value, type, CHECK_NULL);
3307 return JNIHandles::make_local(THREAD, box);
3308 JVM_END
3309
3310
3311 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3312 jvalue value;
3313 value.i = 0; // to initialize value before getting used in CHECK
3314 arrayOop a = check_array(env, arr, true, CHECK_(value));
3315 assert(a->is_typeArray(), "just checking");
3316 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3317 BasicType wide_type = (BasicType) wCode;
3318 if (type != wide_type) {
3319 Reflection::widen(&value, type, wide_type, CHECK_(value));
3320 }
3321 return value;
3322 JVM_END
3323
3324
3325 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3326 arrayOop a = check_array(env, arr, false, CHECK);
3327 oop box = JNIHandles::resolve(val);
3328 jvalue value;
3329 value.i = 0; // to initialize value before getting used in CHECK
3330 BasicType value_type;
3331 if (a->is_objArray()) {
3332 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3333 value_type = Reflection::unbox_for_regular_object(box, &value);
3334 } else {
3335 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3336 }
3337 Reflection::array_set(&value, a, index, value_type, CHECK);
3338 JVM_END
3339
3340
3341 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3342 arrayOop a = check_array(env, arr, true, CHECK);
3343 assert(a->is_typeArray(), "just checking");
3344 BasicType value_type = (BasicType) vCode;
3345 Reflection::array_set(&v, a, index, value_type, CHECK);
3346 JVM_END
3347
3348
3349 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3350 JvmtiVMObjectAllocEventCollector oam;
3351 oop element_mirror = JNIHandles::resolve(eltClass);
3352 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3353 return JNIHandles::make_local(THREAD, result);
3354 JVM_END
3355
3356
3357 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3358 JvmtiVMObjectAllocEventCollector oam;
3359 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3360 oop element_mirror = JNIHandles::resolve(eltClass);
3361 assert(dim_array->is_typeArray(), "just checking");
3362 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3363 return JNIHandles::make_local(THREAD, result);
3364 JVM_END
3365
3366
3367 // Library support ///////////////////////////////////////////////////////////////////////////
3368
3369 JVM_LEAF(void*, JVM_LoadZipLibrary())
3370 ClassLoader::load_zip_library_if_needed();
3371 return ClassLoader::zip_library_handle();
3372 JVM_END
3373
3374 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3375 //%note jvm_ct
3376 char ebuf[1024];
3377 void *load_result;
3378 {
3379 ThreadToNativeFromVM ttnfvm(thread);
3380 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3381 }
3382 if (load_result == NULL) {
3383 if (throwException) {
3384 char msg[1024];
3385 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3386 // Since 'ebuf' may contain a string encoded using
3387 // platform encoding scheme, we need to pass
3388 // Exceptions::unsafe_to_utf8 to the new_exception method
3389 // as the last argument. See bug 6367357.
3390 Handle h_exception =
3391 Exceptions::new_exception(thread,
3392 vmSymbols::java_lang_UnsatisfiedLinkError(),
3393 msg, Exceptions::unsafe_to_utf8);
3394
3395 THROW_HANDLE_0(h_exception);
3396 } else {
3397 log_info(library)("Failed to load library %s", name);
3398 return load_result;
3399 }
3400 }
3401 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3402 return load_result;
3403 JVM_END
3404
3405
3406 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3407 os::dll_unload(handle);
3408 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3409 JVM_END
3410
3411
3412 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3413 void* find_result = os::dll_lookup(handle, name);
3414 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3415 find_result != NULL ? "Found" : "Failed to find",
3416 name, p2i(handle));
3417 return find_result;
3418 JVM_END
3419
3420
3421 // JNI version ///////////////////////////////////////////////////////////////////////////////
3422
3423 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3424 return Threads::is_supported_jni_version_including_1_1(version);
3425 JVM_END
3426
3427
3428 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3429 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3430 JVM_END
3431
3432 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3433 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3434 JVM_END
3435
3436 // String support ///////////////////////////////////////////////////////////////////////////
3437
3438 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3439 JvmtiVMObjectAllocEventCollector oam;
3440 if (str == NULL) return NULL;
3441 oop string = JNIHandles::resolve_non_null(str);
3442 oop result = StringTable::intern(string, CHECK_NULL);
3443 return (jstring) JNIHandles::make_local(THREAD, result);
3444 JVM_END
3445
3446
3447 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3448
3449 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3450 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3451 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3452 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3453 // nature. JavaThreads will be "in native" when using this API from JDK code.
3454
3455
3456 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3457 VM_Exit::block_if_vm_exited();
3458 return new PlatformMutex();
3459 }
3460
3461
3462 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3463 VM_Exit::block_if_vm_exited();
3464 delete ((PlatformMutex*) mon);
3465 }
3466
3467
3468 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3469 VM_Exit::block_if_vm_exited();
3470 ((PlatformMutex*) mon)->lock();
3471 return 0;
3472 }
3473
3474
3475 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3476 VM_Exit::block_if_vm_exited();
3477 ((PlatformMutex*) mon)->unlock();
3478 }
3479
3480
3481 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3482
3483 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3484 Handle loader, Handle protection_domain,
3485 jboolean throwError, TRAPS) {
3486 // Security Note:
3487 // The Java level wrapper will perform the necessary security check allowing
3488 // us to pass the NULL as the initiating class loader. The VM is responsible for
3489 // the checkPackageAccess relative to the initiating class loader via the
3490 // protection_domain. The protection_domain is passed as NULL by the java code
3491 // if there is no security manager in 3-arg Class.forName().
3492 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3493
3494 // Check if we should initialize the class
3495 if (init && klass->is_instance_klass()) {
3496 klass->initialize(CHECK_NULL);
3497 }
3498 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3499 }
3500
3501
3502 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3503
3504 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3505 Handle method_handle;
3506 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3507 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3508 Handle receiver(THREAD, JNIHandles::resolve(obj));
3509 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3510 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3511 jobject res = JNIHandles::make_local(THREAD, result);
3512 if (JvmtiExport::should_post_vm_object_alloc()) {
3513 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3514 assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3515 if (java_lang_Class::is_primitive(ret_type)) {
3516 // Only for primitive type vm allocates memory for java object.
3517 // See box() method.
3518 JvmtiExport::post_vm_object_alloc(thread, result);
3519 }
3520 }
3521 return res;
3522 } else {
3523 THROW_0(vmSymbols::java_lang_StackOverflowError());
3524 }
3525 JVM_END
3526
3527
3528 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3529 oop constructor_mirror = JNIHandles::resolve(c);
3530 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3531 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3532 jobject res = JNIHandles::make_local(THREAD, result);
3533 if (JvmtiExport::should_post_vm_object_alloc()) {
3534 JvmtiExport::post_vm_object_alloc(thread, result);
3535 }
3536 return res;
3537 JVM_END
3538
3539 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3540
3541 JVM_LEAF(jboolean, JVM_SupportsCX8())
3542 return VM_Version::supports_cx8();
3543 JVM_END
3544
3545 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3546 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3547 assert(k->is_klass(), "just checking");
3548 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3549 JVM_END
3550
3551 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3552 jclass caller,
3553 jstring interfaceMethodName,
3554 jobject factoryType,
3555 jobject interfaceMethodType,
3556 jobject implementationMember,
3557 jobject dynamicMethodType,
3558 jclass lambdaProxyClass))
3559 #if INCLUDE_CDS
3560 if (!Arguments::is_dumping_archive()) {
3561 return;
3562 }
3563
3564 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3565 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3566 if (caller_ik->is_hidden()) {
3567 // Hidden classes not of type lambda proxy classes are currently not being archived.
3568 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3569 // registered for archiving.
3570 return;
3571 }
3572 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3573 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3574 assert(lambda_ik->is_hidden(), "must be a hidden class");
3575 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3576
3577 Symbol* interface_method_name = NULL;
3578 if (interfaceMethodName != NULL) {
3579 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3580 }
3581 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3582 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3583
3584 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3585 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3586
3587 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3588 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3589 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3590
3591 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3592 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3593
3594 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3595 interface_method_type, m, dynamic_method_type, THREAD);
3596 #endif // INCLUDE_CDS
3597 JVM_END
3598
3599 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3600 jclass caller,
3601 jstring interfaceMethodName,
3602 jobject factoryType,
3603 jobject interfaceMethodType,
3604 jobject implementationMember,
3605 jobject dynamicMethodType))
3606 #if INCLUDE_CDS
3607
3608 if (interfaceMethodName == NULL || factoryType == NULL || interfaceMethodType == NULL ||
3609 implementationMember == NULL || dynamicMethodType == NULL) {
3610 THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
3611 }
3612
3613 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3614 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3615 if (!caller_ik->is_shared()) {
3616 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3617 return NULL;
3618 }
3619
3620 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3621 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3622 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3623
3624 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3625 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3626
3627 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3628 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3629 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3630
3631 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3632 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3633
3634 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3635 interface_method_type, m, dynamic_method_type);
3636 jclass jcls = NULL;
3637 if (lambda_ik != NULL) {
3638 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3639 jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3640 }
3641 return jcls;
3642 #else
3643 return NULL;
3644 #endif // INCLUDE_CDS
3645 JVM_END
3646
3647 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3648 return Arguments::is_dumping_archive();
3649 JVM_END
3650
3651 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env))
3652 return UseSharedSpaces;
3653 JVM_END
3654
3655 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3656 if (DumpSharedSpaces) {
3657 const char* release = VM_Version::vm_release();
3658 const char* dbg_level = VM_Version::jdk_debug_level();
3659 const char* version = VM_Version::internal_vm_info_string();
3660 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3661 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3662 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3663 seed += (jlong)VM_Version::vm_major_version();
3664 seed += (jlong)VM_Version::vm_minor_version();
3665 seed += (jlong)VM_Version::vm_security_version();
3666 seed += (jlong)VM_Version::vm_patch_version();
3667 if (seed == 0) { // don't let this ever be zero.
3668 seed = 0x87654321;
3669 }
3670 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3671 return seed;
3672 } else {
3673 return 0;
3674 }
3675 JVM_END
3676
3677 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env))
3678 #if INCLUDE_CDS
3679 return ClassListWriter::is_enabled() || DynamicDumpSharedSpaces;
3680 #else
3681 return false;
3682 #endif // INCLUDE_CDS
3683 JVM_END
3684
3685 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3686 #if INCLUDE_CDS
3687 assert(ClassListWriter::is_enabled() || DynamicDumpSharedSpaces, "Should be set and open or do dynamic dump");
3688 if (line != NULL) {
3689 ResourceMark rm(THREAD);
3690 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3691 char* c_line = java_lang_String::as_utf8_string(h_line());
3692 if (DynamicDumpSharedSpaces) {
3693 // Note: LambdaFormInvokers::append take same format which is not
3694 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3695 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3696 }
3697 if (ClassListWriter::is_enabled()) {
3698 ClassListWriter w;
3699 w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line);
3700 }
3701 }
3702 #endif // INCLUDE_CDS
3703 JVM_END
3704
3705 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3706 #if INCLUDE_CDS
3707 ResourceMark rm(THREAD);
3708 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3709 char* file_name = java_lang_String::as_utf8_string(file_handle());
3710 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3711 #endif // INCLUDE_CDS
3712 JVM_END
3713
3714 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3715 #if INCLUDE_CDS
3716 ResourceMark rm(THREAD);
3717 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3718 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3719 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3720 #endif // INCLUDE_CDS
3721 JVM_END
3722
3723 // Returns an array of all live Thread objects (VM internal JavaThreads,
3724 // jvmti agent threads, and JNI attaching threads are skipped)
3725 // See CR 6404306 regarding JNI attaching threads
3726 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3727 ResourceMark rm(THREAD);
3728 ThreadsListEnumerator tle(THREAD, false, false);
3729 JvmtiVMObjectAllocEventCollector oam;
3730
3731 int num_threads = tle.num_threads();
3732 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3733 objArrayHandle threads_ah(THREAD, r);
3734
3735 for (int i = 0; i < num_threads; i++) {
3736 Handle h = tle.get_threadObj(i);
3737 threads_ah->obj_at_put(i, h());
3738 }
3739
3740 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3741 JVM_END
3742
3743
3744 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3745 // Return StackTraceElement[][], each element is the stack trace of a thread in
3746 // the corresponding entry in the given threads array
3747 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3748 JvmtiVMObjectAllocEventCollector oam;
3749
3750 // Check if threads is null
3751 if (threads == NULL) {
3752 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3753 }
3754
3755 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3756 objArrayHandle ah(THREAD, a);
3757 int num_threads = ah->length();
3758 // check if threads is non-empty array
3759 if (num_threads == 0) {
3760 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3761 }
3762
3763 // check if threads is not an array of objects of Thread class
3764 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3765 if (k != vmClasses::Thread_klass()) {
3766 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3767 }
3768
3769 ResourceMark rm(THREAD);
3770
3771 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3772 for (int i = 0; i < num_threads; i++) {
3773 oop thread_obj = ah->obj_at(i);
3774 instanceHandle h(THREAD, (instanceOop) thread_obj);
3775 thread_handle_array->append(h);
3776 }
3777
3778 // The JavaThread references in thread_handle_array are validated
3779 // in VM_ThreadDump::doit().
3780 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3781 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3782
3783 JVM_END
3784
3785 // JVM monitoring and management support
3786 JVM_LEAF(void*, JVM_GetManagement(jint version))
3787 return Management::get_jmm_interface(version);
3788 JVM_END
3789
3790 // com.sun.tools.attach.VirtualMachine agent properties support
3791 //
3792 // Initialize the agent properties with the properties maintained in the VM
3793 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3794 ResourceMark rm;
3795
3796 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3797
3798 PUTPROP(props, "sun.java.command", Arguments::java_command());
3799 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3800 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3801 return properties;
3802 JVM_END
3803
3804 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3805 {
3806 JvmtiVMObjectAllocEventCollector oam;
3807
3808 if (ofClass == NULL) {
3809 return NULL;
3810 }
3811 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3812 // Special handling for primitive objects
3813 if (java_lang_Class::is_primitive(mirror())) {
3814 return NULL;
3815 }
3816 Klass* k = java_lang_Class::as_Klass(mirror());
3817 if (!k->is_instance_klass()) {
3818 return NULL;
3819 }
3820 InstanceKlass* ik = InstanceKlass::cast(k);
3821 int encl_method_class_idx = ik->enclosing_method_class_index();
3822 if (encl_method_class_idx == 0) {
3823 return NULL;
3824 }
3825 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3826 objArrayHandle dest(THREAD, dest_o);
3827 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3828 dest->obj_at_put(0, enc_k->java_mirror());
3829 int encl_method_method_idx = ik->enclosing_method_method_index();
3830 if (encl_method_method_idx != 0) {
3831 Symbol* sym = ik->constants()->symbol_at(
3832 extract_low_short_from_int(
3833 ik->constants()->name_and_type_at(encl_method_method_idx)));
3834 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3835 dest->obj_at_put(1, str());
3836 sym = ik->constants()->symbol_at(
3837 extract_high_short_from_int(
3838 ik->constants()->name_and_type_at(encl_method_method_idx)));
3839 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3840 dest->obj_at_put(2, str());
3841 }
3842 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3843 }
3844 JVM_END
3845
3846 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3847 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3848 ResourceMark rm(THREAD);
3849
3850 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3851 return NULL;
3852 }
3853
3854 char** vm_flags = Arguments::jvm_flags_array();
3855 char** vm_args = Arguments::jvm_args_array();
3856 int num_flags = Arguments::num_jvm_flags();
3857 int num_args = Arguments::num_jvm_args();
3858
3859 InstanceKlass* ik = vmClasses::String_klass();
3860 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3861 objArrayHandle result_h(THREAD, r);
3862
3863 int index = 0;
3864 for (int j = 0; j < num_flags; j++, index++) {
3865 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3866 result_h->obj_at_put(index, h());
3867 }
3868 for (int i = 0; i < num_args; i++, index++) {
3869 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3870 result_h->obj_at_put(index, h());
3871 }
3872 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3873 JVM_END
3874
3875 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3876 return os::get_signal_number(name);
3877 JVM_END
3878
3879 JVM_ENTRY(void, JVM_VirtualThreadMountBegin(JNIEnv* env, jobject vthread, jboolean first_mount))
3880 #if INCLUDE_JVMTI
3881 if (!DoJVMTIVirtualThreadTransitions) {
3882 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3883 return;
3884 }
3885 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
3886 assert(!thread->is_in_VTMS_transition(), "sanity check");
3887 JvmtiVTMSTransitionDisabler::start_VTMS_transition(vthread, /* is_mount */ true);
3888 #else
3889 fatal("Should only be called with JVMTI enabled");
3890 #endif
3891 JVM_END
3892
3893 JVM_ENTRY(void, JVM_VirtualThreadMountEnd(JNIEnv* env, jobject vthread, jboolean first_mount))
3894 #if INCLUDE_JVMTI
3895 if (!DoJVMTIVirtualThreadTransitions) {
3896 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3897 return;
3898 }
3899 oop vt = JNIHandles::resolve(vthread);
3900
3901 thread->rebind_to_jvmti_thread_state_of(vt);
3902
3903 {
3904 MutexLocker mu(JvmtiThreadState_lock);
3905 JvmtiThreadState* state = thread->jvmti_thread_state();
3906 if (state != NULL && state->is_pending_interp_only_mode()) {
3907 JvmtiEventController::enter_interp_only_mode();
3908 }
3909 }
3910 assert(thread->is_in_VTMS_transition(), "sanity check");
3911 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
3912 JvmtiVTMSTransitionDisabler::finish_VTMS_transition(vthread, /* is_mount */ true);
3913 if (first_mount) {
3914 // thread start
3915 if (JvmtiExport::can_support_virtual_threads()) {
3916 JvmtiEventController::thread_started(thread);
3917 if (JvmtiExport::should_post_vthread_start()) {
3918 JvmtiExport::post_vthread_start(vthread);
3919 }
3920 } else { // compatibility for vthread unaware agents: legacy thread_start
3921 if (PostVirtualThreadCompatibleLifecycleEvents &&
3922 JvmtiExport::should_post_thread_life()) {
3923 // JvmtiEventController::thread_started is called here
3924 JvmtiExport::post_thread_start(thread);
3925 }
3926 }
3927 }
3928 if (JvmtiExport::should_post_vthread_mount()) {
3929 JvmtiExport::post_vthread_mount(vthread);
3930 }
3931 #else
3932 fatal("Should only be called with JVMTI enabled");
3933 #endif
3934 JVM_END
3935
3936 JVM_ENTRY(void, JVM_VirtualThreadUnmountBegin(JNIEnv* env, jobject vthread, jboolean last_unmount))
3937 #if INCLUDE_JVMTI
3938 if (!DoJVMTIVirtualThreadTransitions) {
3939 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3940 return;
3941 }
3942 HandleMark hm(thread);
3943 Handle ct(thread, thread->threadObj());
3944
3945 if (JvmtiExport::should_post_vthread_unmount()) {
3946 JvmtiExport::post_vthread_unmount(vthread);
3947 }
3948 if (last_unmount) {
3949 if (JvmtiExport::can_support_virtual_threads()) {
3950 if (JvmtiExport::should_post_vthread_end()) {
3951 JvmtiExport::post_vthread_end(vthread);
3952 }
3953 } else { // compatibility for vthread unaware agents: legacy thread_end
3954 if (PostVirtualThreadCompatibleLifecycleEvents &&
3955 JvmtiExport::should_post_thread_life()) {
3956 JvmtiExport::post_thread_end(thread);
3957 }
3958 }
3959 }
3960 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
3961 assert(!thread->is_in_VTMS_transition(), "sanity check");
3962 JvmtiVTMSTransitionDisabler::start_VTMS_transition(vthread, /* is_mount */ false);
3963
3964 if (last_unmount && thread->jvmti_thread_state() != NULL) {
3965 JvmtiExport::cleanup_thread(thread);
3966 thread->set_jvmti_thread_state(NULL);
3967 oop vt = JNIHandles::resolve(vthread);
3968 java_lang_Thread::set_jvmti_thread_state(vt, NULL);
3969 }
3970 thread->rebind_to_jvmti_thread_state_of(ct());
3971 #else
3972 fatal("Should only be called with JVMTI enabled");
3973 #endif
3974 JVM_END
3975
3976 JVM_ENTRY(void, JVM_VirtualThreadUnmountEnd(JNIEnv* env, jobject vthread, jboolean last_unmount))
3977 #if INCLUDE_JVMTI
3978 if (!DoJVMTIVirtualThreadTransitions) {
3979 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3980 return;
3981 }
3982 assert(thread->is_in_VTMS_transition(), "sanity check");
3983 assert(!thread->is_in_tmp_VTMS_transition(), "sanity check");
3984 JvmtiVTMSTransitionDisabler::finish_VTMS_transition(vthread, /* is_mount */ false);
3985 #else
3986 fatal("Should only be called with JVMTI enabled");
3987 #endif
3988 JVM_END
3989
3990 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jobject vthread, jboolean hide))
3991 #if INCLUDE_JVMTI
3992 if (!DoJVMTIVirtualThreadTransitions) {
3993 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3994 return;
3995 }
3996 assert(!thread->is_in_VTMS_transition(), "sanity check");
3997 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check");
3998 thread->toggle_is_in_tmp_VTMS_transition();
3999 #else
4000 fatal("Should only be called with JVMTI enabled");
4001 #endif
4002 JVM_END
4003
4004 /*
4005 * Return the current class's class file version. The low order 16 bits of the
4006 * returned jint contain the class's major version. The high order 16 bits
4007 * contain the class's minor version.
4008 */
4009 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4010 oop mirror = JNIHandles::resolve_non_null(current);
4011 if (java_lang_Class::is_primitive(mirror)) {
4012 // return latest major version and minor version of 0.
4013 return JVM_CLASSFILE_MAJOR_VERSION;
4014 }
4015 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4016
4017 Klass* c = java_lang_Class::as_Klass(mirror);
4018 assert(c->is_instance_klass(), "must be");
4019 InstanceKlass* ik = InstanceKlass::cast(c);
4020 return (ik->minor_version() << 16) | ik->major_version();
4021 JVM_END