1 /*
2 * Copyright (c) 1997, 2024, 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 "cds/cdsConfig.hpp"
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 "jvm.h"
52 #include "logging/log.hpp"
53 #include "memory/oopFactory.hpp"
54 #include "memory/referenceType.hpp"
55 #include "memory/resourceArea.hpp"
56 #include "memory/universe.hpp"
57 #include "oops/access.inline.hpp"
58 #include "oops/constantPool.hpp"
59 #include "oops/fieldStreams.inline.hpp"
60 #include "oops/instanceKlass.hpp"
61 #include "oops/klass.inline.hpp"
62 #include "oops/method.hpp"
63 #include "oops/recordComponent.hpp"
64 #include "oops/objArrayKlass.hpp"
65 #include "oops/objArrayOop.inline.hpp"
66 #include "oops/oop.inline.hpp"
67 #include "prims/foreignGlobals.hpp"
68 #include "prims/jvm_misc.hpp"
69 #include "prims/jvmtiExport.hpp"
70 #include "prims/jvmtiThreadState.inline.hpp"
71 #include "prims/stackwalk.hpp"
72 #include "runtime/arguments.hpp"
73 #include "runtime/atomic.hpp"
74 #include "runtime/continuation.hpp"
75 #include "runtime/globals_extension.hpp"
76 #include "runtime/handles.inline.hpp"
77 #include "runtime/init.hpp"
78 #include "runtime/interfaceSupport.inline.hpp"
79 #include "runtime/deoptimization.hpp"
80 #include "runtime/handshake.hpp"
81 #include "runtime/java.hpp"
82 #include "runtime/javaCalls.hpp"
83 #include "runtime/javaThread.hpp"
84 #include "runtime/jfieldIDWorkaround.hpp"
85 #include "runtime/jniHandles.inline.hpp"
86 #include "runtime/os.inline.hpp"
87 #include "runtime/osThread.hpp"
88 #include "runtime/perfData.hpp"
89 #include "runtime/reflection.hpp"
90 #include "runtime/synchronizer.hpp"
91 #include "runtime/threadIdentifier.hpp"
92 #include "runtime/threadSMR.hpp"
93 #include "runtime/vframe.inline.hpp"
94 #include "runtime/vmOperations.hpp"
95 #include "runtime/vm_version.hpp"
96 #include "services/attachListener.hpp"
97 #include "services/management.hpp"
98 #include "services/threadService.hpp"
99 #include "utilities/checkedCast.hpp"
100 #include "utilities/copy.hpp"
101 #include "utilities/defaultStream.hpp"
102 #include "utilities/dtrace.hpp"
103 #include "utilities/events.hpp"
104 #include "utilities/macros.hpp"
105 #include "utilities/utf8.hpp"
106 #include "utilities/zipLibrary.hpp"
107 #if INCLUDE_CDS
108 #include "classfile/systemDictionaryShared.hpp"
109 #endif
110 #if INCLUDE_JFR
111 #include "jfr/jfr.hpp"
112 #endif
113 #if INCLUDE_MANAGEMENT
114 #include "services/finalizerService.hpp"
115 #endif
116 #ifdef LINUX
117 #include "osContainer_linux.hpp"
118 #endif
119
120 #include <errno.h>
121
122 /*
123 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
124 such ctors and calls MUST NOT come between an oop declaration/init and its
125 usage because if objects are move this may cause various memory stomps, bus
126 errors and segfaults. Here is a cookbook for causing so called "naked oop
127 failures":
128
129 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
130 // Object address to be held directly in mirror & not visible to GC
131 oop mirror = JNIHandles::resolve_non_null(ofClass);
132
133 // If this ctor can hit a safepoint, moving objects around, then
134 ComplexConstructor foo;
135
136 // Boom! mirror may point to JUNK instead of the intended object
137 (some dereference of mirror)
138
139 // Here's another call that may block for GC, making mirror stale
140 MutexLocker ml(some_lock);
141
142 // And here's an initializer that can result in a stale oop
143 // all in one step.
144 oop o = call_that_can_throw_exception(TRAPS);
145
146
147 The solution is to keep the oop declaration BELOW the ctor or function
148 call that might cause a GC, do another resolve to reassign the oop, or
149 consider use of a Handle instead of an oop so there is immunity from object
150 motion. But note that the "QUICK" entries below do not have a handlemark
151 and thus can only support use of handles passed in.
152 */
153
154 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
155 ResourceMark rm;
156 int line_number = -1;
157 const char * source_file = nullptr;
158 const char * trace = "explicit";
159 InstanceKlass* caller = nullptr;
160 JavaThread* jthread = THREAD;
161 if (jthread->has_last_Java_frame()) {
162 vframeStream vfst(jthread);
163
164 // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
165 TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
166 Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
167 TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
168 Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
169
170 Method* last_caller = nullptr;
171
172 while (!vfst.at_end()) {
173 Method* m = vfst.method();
174 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
175 !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
176 !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
177 break;
178 }
179 last_caller = m;
180 vfst.next();
181 }
182 // if this is called from Class.forName0 and that is called from Class.forName,
183 // then print the caller of Class.forName. If this is Class.loadClass, then print
184 // that caller, otherwise keep quiet since this should be picked up elsewhere.
185 bool found_it = false;
186 if (!vfst.at_end() &&
187 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
188 vfst.method()->name() == vmSymbols::forName0_name()) {
189 vfst.next();
190 if (!vfst.at_end() &&
191 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
192 vfst.method()->name() == vmSymbols::forName_name()) {
193 vfst.next();
194 found_it = true;
195 }
196 } else if (last_caller != nullptr &&
197 last_caller->method_holder()->name() ==
198 vmSymbols::java_lang_ClassLoader() &&
199 last_caller->name() == vmSymbols::loadClass_name()) {
200 found_it = true;
201 } else if (!vfst.at_end()) {
202 if (vfst.method()->is_native()) {
203 // JNI call
204 found_it = true;
205 }
206 }
207 if (found_it && !vfst.at_end()) {
208 // found the caller
209 caller = vfst.method()->method_holder();
210 line_number = vfst.method()->line_number_from_bci(vfst.bci());
211 if (line_number == -1) {
212 // show method name if it's a native method
213 trace = vfst.method()->name_and_sig_as_C_string();
214 }
215 Symbol* s = caller->source_file_name();
216 if (s != nullptr) {
217 source_file = s->as_C_string();
218 }
219 }
220 }
221 if (caller != nullptr) {
222 if (to_class != caller) {
223 const char * from = caller->external_name();
224 const char * to = to_class->external_name();
225 // print in a single call to reduce interleaving between threads
226 if (source_file != nullptr) {
227 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
228 } else {
229 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
230 }
231 }
232 }
233 }
234
235 void trace_class_resolution(Klass* to_class) {
236 EXCEPTION_MARK;
237 trace_class_resolution_impl(to_class, THREAD);
238 if (HAS_PENDING_EXCEPTION) {
239 CLEAR_PENDING_EXCEPTION;
240 }
241 }
242
243 // java.lang.System //////////////////////////////////////////////////////////////////////
244
245
246 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
247 return os::javaTimeMillis();
248 JVM_END
249
250 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
251 return os::javaTimeNanos();
252 JVM_END
253
254 // The function below is actually exposed by jdk.internal.misc.VM and not
255 // java.lang.System, but we choose to keep it here so that it stays next
256 // to JVM_CurrentTimeMillis and JVM_NanoTime
257
258 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
259 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
260
261 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
262 jlong seconds;
263 jlong nanos;
264
265 os::javaTimeSystemUTC(seconds, nanos);
266
267 // We're going to verify that the result can fit in a long.
268 // For that we need the difference in seconds between 'seconds'
269 // and 'offset_secs' to be such that:
270 // |seconds - offset_secs| < (2^63/10^9)
271 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
272 // which makes |seconds - offset_secs| < 2^33
273 // and we will prefer +/- 2^32 as the maximum acceptable diff
274 // as 2^32 has a more natural feel than 2^33...
275 //
276 // So if |seconds - offset_secs| >= 2^32 - we return a special
277 // sentinel value (-1) which the caller should take as an
278 // exception value indicating that the offset given to us is
279 // too far from range of the current time - leading to too big
280 // a nano adjustment. The caller is expected to recover by
281 // computing a more accurate offset and calling this method
282 // again. (For the record 2^32 secs is ~136 years, so that
283 // should rarely happen)
284 //
285 jlong diff = seconds - offset_secs;
286 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
287 return -1; // sentinel value: the offset is too far off the target
288 }
289
290 // return the adjustment. If you compute a time by adding
291 // this number of nanoseconds along with the number of seconds
292 // in the offset you should get the current UTC time.
293 return (diff * (jlong)1000000000) + nanos;
294 JVM_END
295
296 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
297 jobject dst, jint dst_pos, jint length))
298 // Check if we have null pointers
299 if (src == nullptr || dst == nullptr) {
300 THROW(vmSymbols::java_lang_NullPointerException());
301 }
302 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
303 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
304 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
305 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
306 // Do copy
307 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
308 JVM_END
309
310
311 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
312 JavaValue r(T_OBJECT);
313 // public synchronized Object put(Object key, Object value);
314 HandleMark hm(THREAD);
315 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
316 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
317 JavaCalls::call_virtual(&r,
318 props,
319 vmClasses::Properties_klass(),
320 vmSymbols::put_name(),
321 vmSymbols::object_object_object_signature(),
322 key_str,
323 value_str,
324 THREAD);
325 }
326
327
328 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
329
330 /*
331 * Return all of the system properties in a Java String array with alternating
332 * names and values from the jvm SystemProperty.
333 * Which includes some internal and all commandline -D defined properties.
334 */
335 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
336 ResourceMark rm(THREAD);
337 HandleMark hm(THREAD);
338 int ndx = 0;
339 int fixedCount = 2;
340
341 SystemProperty* p = Arguments::system_properties();
342 int count = Arguments::PropertyList_count(p);
343
344 // Allocate result String array
345 InstanceKlass* ik = vmClasses::String_klass();
346 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
347 objArrayHandle result_h(THREAD, r);
348
349 while (p != nullptr) {
350 const char * key = p->key();
351 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
352 const char * value = p->value();
353 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
354 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
355 result_h->obj_at_put(ndx * 2, key_str());
356 result_h->obj_at_put(ndx * 2 + 1, value_str());
357 ndx++;
358 }
359 p = p->next();
360 }
361
362 // Convert the -XX:MaxDirectMemorySize= command line flag
363 // to the sun.nio.MaxDirectMemorySize property.
364 // Do this after setting user properties to prevent people
365 // from setting the value with a -D option, as requested.
366 // Leave empty if not supplied
367 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
368 char as_chars[256];
369 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
370 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
371 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
372 result_h->obj_at_put(ndx * 2, key_str());
373 result_h->obj_at_put(ndx * 2 + 1, value_str());
374 ndx++;
375 }
376
377 // JVM monitoring and management support
378 // Add the sun.management.compiler property for the compiler's name
379 {
380 #undef CSIZE
381 #if defined(_LP64)
382 #define CSIZE "64-Bit "
383 #else
384 #define CSIZE
385 #endif // 64bit
386
387 #if COMPILER1_AND_COMPILER2
388 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
389 #else
390 #if defined(COMPILER1)
391 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
392 #elif defined(COMPILER2)
393 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
394 #elif INCLUDE_JVMCI
395 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
396 #else
397 const char* compiler_name = "";
398 #endif // compilers
399 #endif // COMPILER1_AND_COMPILER2
400
401 if (*compiler_name != '\0' &&
402 (Arguments::mode() != Arguments::_int)) {
403 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
404 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
405 result_h->obj_at_put(ndx * 2, key_str());
406 result_h->obj_at_put(ndx * 2 + 1, value_str());
407 ndx++;
408 }
409 }
410
411 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
412 JVM_END
413
414
415 /*
416 * Return the temporary directory that the VM uses for the attach
417 * and perf data files.
418 *
419 * It is important that this directory is well-known and the
420 * same for all VM instances. It cannot be affected by configuration
421 * variables such as java.io.tmpdir.
422 */
423 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
424 HandleMark hm(THREAD);
425 const char* temp_dir = os::get_temp_directory();
426 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
427 return (jstring) JNIHandles::make_local(THREAD, h());
428 JVM_END
429
430
431 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
432
433 extern volatile jint vm_created;
434
435 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
436 EventShutdown event;
437 if (event.should_commit()) {
438 event.set_reason("Shutdown requested from Java");
439 event.commit();
440 }
441 JVM_END
442
443
444 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
445 before_exit(thread, true);
446 vm_exit(code);
447 JVM_END
448
449
450 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
451 if (!DisableExplicitGC) {
452 EventSystemGC event;
453 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
454 Universe::heap()->collect(GCCause::_java_lang_system_gc);
455 event.commit();
456 }
457 JVM_END
458
459
460 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
461 return Universe::heap()->millis_since_last_whole_heap_examined();
462 JVM_END
463
464
465 static inline jlong convert_size_t_to_jlong(size_t val) {
466 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
467 NOT_LP64 (return (jlong)val;)
468 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
469 }
470
471 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
472 size_t n = Universe::heap()->capacity();
473 return convert_size_t_to_jlong(n);
474 JVM_END
475
476
477 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
478 size_t n = Universe::heap()->unused();
479 return convert_size_t_to_jlong(n);
480 JVM_END
481
482
483 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
484 size_t n = Universe::heap()->max_capacity();
485 return convert_size_t_to_jlong(n);
486 JVM_END
487
488
489 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
490 return os::active_processor_count();
491 JVM_END
492
493 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
494 #ifdef LINUX
495 if (UseContainerSupport) {
496 return JNI_TRUE;
497 }
498 #endif
499 return JNI_FALSE;
500 JVM_END
501
502 JVM_LEAF(jboolean, JVM_IsContainerized(void))
503 #ifdef LINUX
504 if (OSContainer::is_containerized()) {
505 return JNI_TRUE;
506 }
507 #endif
508 return JNI_FALSE;
509 JVM_END
510
511 // java.lang.Throwable //////////////////////////////////////////////////////
512
513 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
514 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
515 java_lang_Throwable::fill_in_stack_trace(exception);
516 JVM_END
517
518 // java.lang.NullPointerException ///////////////////////////////////////////
519
520 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
521 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
522
523 oop exc = JNIHandles::resolve_non_null(throwable);
524
525 Method* method;
526 int bci;
527 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
528 return nullptr;
529 }
530 if (method->is_native()) {
531 return nullptr;
532 }
533
534 stringStream ss;
535 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
536 if (ok) {
537 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
538 return (jstring) JNIHandles::make_local(THREAD, result);
539 } else {
540 return nullptr;
541 }
542 JVM_END
543
544 // java.lang.StackTraceElement //////////////////////////////////////////////
545
546
547 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
548 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
549 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
550 objArrayHandle stack_trace(THREAD, st);
551 // Fill in the allocated stack trace
552 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
553 JVM_END
554
555
556 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
557 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
558 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
559 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
560 JVM_END
561
562
563 // java.lang.StackWalker //////////////////////////////////////////////////////
564 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
565 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
566
567 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
568 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
569 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
570 if (!have_name) {
571 oop name = StringTable::intern(method->name(), CHECK);
572 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
573 }
574 if (!have_type) {
575 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
576 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
577 }
578 JVM_END
579
580 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
581 jint skip_frames, jobject contScope, jobject cont,
582 jint buffer_size, jint start_index, jobjectArray frames))
583 if (!thread->has_last_Java_frame()) {
584 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
585 }
586
587 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
588 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
589 Handle cont_h(THREAD, JNIHandles::resolve(cont));
590 // frames array is a ClassFrameInfo[] array when only getting caller reference,
591 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
592 // be null.
593 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
594 objArrayHandle frames_array_h(THREAD, fa);
595
596 if (frames_array_h->length() < buffer_size) {
597 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
598 }
599
600 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
601 buffer_size, start_index, frames_array_h, CHECK_NULL);
602 return JNIHandles::make_local(THREAD, result);
603 JVM_END
604
605
606 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
607 jint last_batch_count, jint buffer_size, jint start_index,
608 jobjectArray frames))
609 // frames array is a ClassFrameInfo[] array when only getting caller reference,
610 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
611 // be null.
612 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
613 objArrayHandle frames_array_h(THREAD, fa);
614
615 if (frames_array_h->length() < buffer_size) {
616 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
617 }
618
619 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
620 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
621 start_index, frames_array_h, THREAD);
622 JVM_END
623
624 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
625 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
626 objArrayHandle frames_array_h(THREAD, fa);
627 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
628 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
629
630 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
631 JVM_END
632
633 // java.lang.Object ///////////////////////////////////////////////
634
635
636 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
637 // as implemented in the classic virtual machine; return 0 if object is null
638 return handle == nullptr ? 0 :
639 checked_cast<jint>(ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)));
640 JVM_END
641
642
643 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
644 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
645 JavaThreadInObjectWaitState jtiows(thread, ms != 0);
646 if (JvmtiExport::should_post_monitor_wait()) {
647 JvmtiExport::post_monitor_wait(thread, obj(), ms);
648
649 // The current thread already owns the monitor and it has not yet
650 // been added to the wait queue so the current thread cannot be
651 // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
652 // event handler cannot accidentally consume an unpark() meant for
653 // the ParkEvent associated with this ObjectMonitor.
654 }
655 ObjectSynchronizer::wait(obj, ms, CHECK);
656 JVM_END
657
658
659 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
660 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
661 ObjectSynchronizer::notify(obj, CHECK);
662 JVM_END
663
664
665 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
666 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
667 ObjectSynchronizer::notifyall(obj, CHECK);
668 JVM_END
669
670
671 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
672 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
673 Klass* klass = obj->klass();
674 JvmtiVMObjectAllocEventCollector oam;
675
676 #ifdef ASSERT
677 // Just checking that the cloneable flag is set correct
678 if (obj->is_array()) {
679 guarantee(klass->is_cloneable(), "all arrays are cloneable");
680 } else {
681 guarantee(obj->is_instance(), "should be instanceOop");
682 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
683 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
684 }
685 #endif
686
687 // Check if class of obj supports the Cloneable interface.
688 // All arrays are considered to be cloneable (See JLS 20.1.5).
689 // All j.l.r.Reference classes are considered non-cloneable.
690 if (!klass->is_cloneable() ||
691 (klass->is_instance_klass() &&
692 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
693 ResourceMark rm(THREAD);
694 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
695 }
696
697 // Make shallow object copy
698 const size_t size = obj->size();
699 oop new_obj_oop = nullptr;
700 if (obj->is_array()) {
701 const int length = ((arrayOop)obj())->length();
702 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
703 /* do_zero */ true, CHECK_NULL);
704 } else {
705 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
706 }
707
708 HeapAccess<>::clone(obj(), new_obj_oop, size);
709
710 Handle new_obj(THREAD, new_obj_oop);
711 // Caution: this involves a java upcall, so the clone should be
712 // "gc-robust" by this stage.
713 if (klass->has_finalizer()) {
714 assert(obj->is_instance(), "should be instanceOop");
715 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
716 new_obj = Handle(THREAD, new_obj_oop);
717 }
718
719 return JNIHandles::make_local(THREAD, new_obj());
720 JVM_END
721
722 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
723
724 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
725 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
726 JVM_END
727
728 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
729 return InstanceKlass::is_finalization_enabled();
730 JVM_END
731
732 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
733
734 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
735 CONT_RegisterNativeMethods(env, cls);
736 JVM_END
737
738 // java.io.File ///////////////////////////////////////////////////////////////
739
740 JVM_LEAF(char*, JVM_NativePath(char* path))
741 return os::native_path(path);
742 JVM_END
743
744
745 // Misc. class handling ///////////////////////////////////////////////////////////
746
747
748 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
749 // Getting the class of the caller frame.
750 //
751 // The call stack at this point looks something like this:
752 //
753 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
754 // [1] [ @CallerSensitive API.method ]
755 // [.] [ (skipped intermediate frames) ]
756 // [n] [ caller ]
757 vframeStream vfst(thread);
758 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
759 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
760 Method* m = vfst.method();
761 assert(m != nullptr, "sanity");
762 switch (n) {
763 case 0:
764 // This must only be called from Reflection.getCallerClass
765 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
766 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
767 }
768 // fall-through
769 case 1:
770 // Frame 0 and 1 must be caller sensitive.
771 if (!m->caller_sensitive()) {
772 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
773 }
774 break;
775 default:
776 if (!m->is_ignored_by_security_stack_walk()) {
777 // We have reached the desired frame; return the holder class.
778 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
779 }
780 break;
781 }
782 }
783 return nullptr;
784 JVM_END
785
786
787 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
788 oop mirror = nullptr;
789 BasicType t = name2type(utf);
790 if (t != T_ILLEGAL && !is_reference_type(t)) {
791 mirror = Universe::java_mirror(t);
792 }
793 if (mirror == nullptr) {
794 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
795 } else {
796 return (jclass) JNIHandles::make_local(THREAD, mirror);
797 }
798 JVM_END
799
800
801 // Returns a class loaded by the bootstrap class loader; or null
802 // if not found. ClassNotFoundException is not thrown.
803 // FindClassFromBootLoader is exported to the launcher for windows.
804 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
805 const char* name))
806 // Java libraries should ensure that name is never null or illegal.
807 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
808 // It's impossible to create this class; the name cannot fit
809 // into the constant pool.
810 return nullptr;
811 }
812 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
813
814 TempNewSymbol h_name = SymbolTable::new_symbol(name);
815 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
816 if (k == nullptr) {
817 return nullptr;
818 }
819
820 if (log_is_enabled(Debug, class, resolve)) {
821 trace_class_resolution(k);
822 }
823 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
824 JVM_END
825
826 // Find a class with this name in this loader, using the caller's protection domain.
827 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
828 jboolean init, jobject loader,
829 jclass caller))
830 TempNewSymbol h_name =
831 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
832 CHECK_NULL);
833
834 oop loader_oop = JNIHandles::resolve(loader);
835 oop from_class = JNIHandles::resolve(caller);
836 oop protection_domain = nullptr;
837 // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
838 // NPE. Put it in another way, the bootstrap class loader has all permission and
839 // thus no checkPackageAccess equivalence in the VM class loader.
840 // The caller is also passed as null by the java code if there is no security
841 // manager to avoid the performance cost of getting the calling class.
842 if (from_class != nullptr && loader_oop != nullptr) {
843 protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
844 }
845
846 Handle h_loader(THREAD, loader_oop);
847 Handle h_prot(THREAD, protection_domain);
848 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
849 h_prot, false, THREAD);
850
851 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
852 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
853 }
854 return result;
855 JVM_END
856
857 // Currently only called from the old verifier.
858 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
859 jboolean init, jclass from))
860 TempNewSymbol h_name =
861 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
862 CHECK_NULL);
863 oop from_class_oop = JNIHandles::resolve(from);
864 Klass* from_class = (from_class_oop == nullptr)
865 ? (Klass*)nullptr
866 : java_lang_Class::as_Klass(from_class_oop);
867 oop class_loader = nullptr;
868 oop protection_domain = nullptr;
869 if (from_class != nullptr) {
870 class_loader = from_class->class_loader();
871 protection_domain = from_class->protection_domain();
872 }
873 Handle h_loader(THREAD, class_loader);
874 Handle h_prot (THREAD, protection_domain);
875 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
876 h_prot, true, thread);
877
878 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
879 // this function is generally only used for class loading during verification.
880 ResourceMark rm;
881 oop from_mirror = JNIHandles::resolve_non_null(from);
882 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
883 const char * from_name = from_class->external_name();
884
885 oop mirror = JNIHandles::resolve_non_null(result);
886 Klass* to_class = java_lang_Class::as_Klass(mirror);
887 const char * to = to_class->external_name();
888 log_debug(class, resolve)("%s %s (verification)", from_name, to);
889 }
890
891 return result;
892 JVM_END
893
894 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
895 static jclass jvm_define_class_common(const char *name,
896 jobject loader, const jbyte *buf,
897 jsize len, jobject pd, const char *source,
898 TRAPS) {
899 if (source == nullptr) source = "__JVM_DefineClass__";
900
901 JavaThread* jt = THREAD;
902
903 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
904 ClassLoader::perf_define_appclass_selftime(),
905 ClassLoader::perf_define_appclasses(),
906 jt->get_thread_stat()->perf_recursion_counts_addr(),
907 jt->get_thread_stat()->perf_timers_addr(),
908 PerfClassTraceTime::DEFINE_CLASS);
909
910 if (UsePerfData) {
911 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
912 }
913
914 // Class resolution will get the class name from the .class stream if the name is null.
915 TempNewSymbol class_name = name == nullptr ? nullptr :
916 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
917 CHECK_NULL);
918
919 ResourceMark rm(THREAD);
920 ClassFileStream st((u1*)buf, len, source);
921 Handle class_loader (THREAD, JNIHandles::resolve(loader));
922 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
923 ClassLoadInfo cl_info(protection_domain);
924 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
925 class_loader,
926 cl_info,
927 CHECK_NULL);
928
929 if (log_is_enabled(Debug, class, resolve)) {
930 trace_class_resolution(k);
931 }
932
933 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
934 }
935
936 enum {
937 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
938 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
939 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
940 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
941 };
942
943 /*
944 * Define a class with the specified flags that indicates if it's a nestmate,
945 * hidden, or strongly referenced from class loader.
946 */
947 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
948 const jbyte *buf, jsize len, jobject pd,
949 jboolean init, int flags, jobject classData, TRAPS) {
950 ResourceMark rm(THREAD);
951
952 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
953 // Lookup class must be a non-null instance
954 if (lookup_k == nullptr) {
955 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
956 }
957 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
958
959 Handle class_loader (THREAD, lookup_k->class_loader());
960
961 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
962 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
963 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
964 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
965
966 InstanceKlass* host_class = nullptr;
967 if (is_nestmate) {
968 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
969 }
970
971 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
972 name,
973 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
974 is_nestmate ? host_class->external_name() : "",
975 is_hidden ? "hidden" : "not hidden",
976 is_strong ? "strong" : "weak",
977 vm_annotations ? "with vm annotations" : "without vm annotation");
978
979 if (!is_hidden) {
980 // classData is only applicable for hidden classes
981 if (classData != nullptr) {
982 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
983 }
984 if (is_nestmate) {
985 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
986 }
987 if (!is_strong) {
988 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
989 }
990 if (vm_annotations) {
991 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
992 }
993 if (flags != STRONG_LOADER_LINK) {
994 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
995 err_msg("invalid flag 0x%x", flags));
996 }
997 }
998
999 // Class resolution will get the class name from the .class stream if the name is null.
1000 TempNewSymbol class_name = name == nullptr ? nullptr :
1001 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1002 CHECK_NULL);
1003
1004 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1005 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1006 ClassFileStream st((u1*)buf, len, source);
1007
1008 InstanceKlass* ik = nullptr;
1009 if (!is_hidden) {
1010 ClassLoadInfo cl_info(protection_domain);
1011 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1012 class_loader,
1013 cl_info,
1014 CHECK_NULL);
1015
1016 if (log_is_enabled(Debug, class, resolve)) {
1017 trace_class_resolution(ik);
1018 }
1019 } else { // hidden
1020 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1021 ClassLoadInfo cl_info(protection_domain,
1022 host_class,
1023 classData_h,
1024 is_hidden,
1025 is_strong,
1026 vm_annotations);
1027 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1028 class_loader,
1029 cl_info,
1030 CHECK_NULL);
1031
1032 // The hidden class loader data has been artificially been kept alive to
1033 // this point. The mirror and any instances of this class have to keep
1034 // it alive afterwards.
1035 ik->class_loader_data()->dec_keep_alive_ref_count();
1036
1037 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1038 ModuleEntry* module = ik->module();
1039 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1040 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1041 module_name,
1042 ik->external_name(),
1043 host_class->external_name(),
1044 ik->is_hidden() ? "is hidden" : "is not hidden");
1045 }
1046 }
1047
1048 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1049 // non-hidden class or nestmate class must be in the same package as the Lookup class
1050 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1051 }
1052
1053 if (init) {
1054 ik->initialize(CHECK_NULL);
1055 } else {
1056 ik->link_class(CHECK_NULL);
1057 }
1058
1059 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1060 }
1061
1062 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1063 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1064 JVM_END
1065
1066 /*
1067 * Define a class with the specified lookup class.
1068 * lookup: Lookup class
1069 * name: the name of the class
1070 * buf: class bytes
1071 * len: length of class bytes
1072 * pd: protection domain
1073 * init: initialize the class
1074 * flags: properties of the class
1075 * classData: private static pre-initialized field
1076 */
1077 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1078 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1079
1080 if (lookup == nullptr) {
1081 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1082 }
1083
1084 assert(buf != nullptr, "buf must not be null");
1085
1086 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1087 JVM_END
1088
1089 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1090
1091 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1092 JVM_END
1093
1094 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1095 ResourceMark rm(THREAD);
1096
1097 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1098 char* str = java_lang_String::as_utf8_string(h_name());
1099
1100 // Sanity check, don't expect null
1101 if (str == nullptr) return nullptr;
1102
1103 // Internalize the string, converting '.' to '/' in string.
1104 char* p = (char*)str;
1105 while (*p != '\0') {
1106 if (*p == '.') {
1107 *p = '/';
1108 }
1109 p++;
1110 }
1111
1112 const int str_len = (int)(p - str);
1113 if (str_len > Symbol::max_length()) {
1114 // It's impossible to create this class; the name cannot fit
1115 // into the constant pool.
1116 return nullptr;
1117 }
1118 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1119
1120 // Security Note:
1121 // The Java level wrapper will perform the necessary security check allowing
1122 // us to pass the null as the initiating class loader.
1123 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1124 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1125 h_loader,
1126 Handle());
1127 #if INCLUDE_CDS
1128 if (k == nullptr) {
1129 // If the class is not already loaded, try to see if it's in the shared
1130 // archive for the current classloader (h_loader).
1131 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1132 }
1133 #endif
1134 return (k == nullptr) ? nullptr :
1135 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1136 JVM_END
1137
1138 // Module support //////////////////////////////////////////////////////////////////////////////
1139
1140 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1141 jstring location, jobjectArray packages))
1142 Handle h_module (THREAD, JNIHandles::resolve(module));
1143 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1144 JVM_END
1145
1146 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1147 Handle h_module (THREAD, JNIHandles::resolve(module));
1148 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1149 JVM_END
1150
1151 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1152 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1153 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1154 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1155 JVM_END
1156
1157 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1158 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1159 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1160 JVM_END
1161
1162 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1163 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1164 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1165 JVM_END
1166
1167 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1168 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1169 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1170 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1171 JVM_END
1172
1173 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1174 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1175 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1176 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1177 JVM_END
1178
1179 // Reflection support //////////////////////////////////////////////////////////////////////////////
1180
1181 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1182 assert (cls != nullptr, "illegal class");
1183 JvmtiVMObjectAllocEventCollector oam;
1184 ResourceMark rm(THREAD);
1185 HandleMark hm(THREAD);
1186 Handle java_class(THREAD, JNIHandles::resolve(cls));
1187 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1188 return (jstring) JNIHandles::make_local(THREAD, result);
1189 JVM_END
1190
1191
1192 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1193 JvmtiVMObjectAllocEventCollector oam;
1194 oop mirror = JNIHandles::resolve_non_null(cls);
1195
1196 // Special handling for primitive objects
1197 if (java_lang_Class::is_primitive(mirror)) {
1198 // Primitive objects does not have any interfaces
1199 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1200 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1201 }
1202
1203 Klass* klass = java_lang_Class::as_Klass(mirror);
1204 // Figure size of result array
1205 int size;
1206 if (klass->is_instance_klass()) {
1207 size = InstanceKlass::cast(klass)->local_interfaces()->length();
1208 } else {
1209 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1210 size = 2;
1211 }
1212
1213 // Allocate result array
1214 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1215 objArrayHandle result (THREAD, r);
1216 // Fill in result
1217 if (klass->is_instance_klass()) {
1218 // Regular instance klass, fill in all local interfaces
1219 for (int index = 0; index < size; index++) {
1220 Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1221 result->obj_at_put(index, k->java_mirror());
1222 }
1223 } else {
1224 // All arrays implement java.lang.Cloneable and java.io.Serializable
1225 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1226 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1227 }
1228 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1229 JVM_END
1230
1231
1232 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1233 oop mirror = JNIHandles::resolve_non_null(cls);
1234 if (java_lang_Class::is_primitive(mirror)) {
1235 return JNI_FALSE;
1236 }
1237 Klass* k = java_lang_Class::as_Klass(mirror);
1238 jboolean result = k->is_interface();
1239 assert(!result || k->is_instance_klass(),
1240 "all interfaces are instance types");
1241 // The compiler intrinsic for isInterface tests the
1242 // Klass::_access_flags bits in the same way.
1243 return result;
1244 JVM_END
1245
1246 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1247 oop mirror = JNIHandles::resolve_non_null(cls);
1248 if (java_lang_Class::is_primitive(mirror)) {
1249 return JNI_FALSE;
1250 }
1251 Klass* k = java_lang_Class::as_Klass(mirror);
1252 return k->is_hidden();
1253 JVM_END
1254
1255
1256 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1257 oop mirror = JNIHandles::resolve_non_null(cls);
1258 if (mirror == nullptr) {
1259 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
1260 }
1261
1262 if (java_lang_Class::is_primitive(mirror)) {
1263 // Primitive types does not have a protection domain.
1264 return nullptr;
1265 }
1266
1267 oop pd = java_lang_Class::protection_domain(mirror);
1268 return (jobject) JNIHandles::make_local(THREAD, pd);
1269 JVM_END
1270
1271
1272 class ScopedValueBindingsResolver {
1273 public:
1274 InstanceKlass* Carrier_klass;
1275 ScopedValueBindingsResolver(JavaThread* THREAD) {
1276 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1277 Carrier_klass = InstanceKlass::cast(k);
1278 }
1279 };
1280
1281 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1282 ResourceMark rm(THREAD);
1283 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1284 JvmtiVMObjectAllocEventCollector oam;
1285
1286 static ScopedValueBindingsResolver resolver(THREAD);
1287
1288 // Iterate through Java frames
1289 vframeStream vfst(thread);
1290 for(; !vfst.at_end(); vfst.next()) {
1291 int loc = -1;
1292 // get method of frame
1293 Method* method = vfst.method();
1294
1295 Symbol *name = method->name();
1296
1297 InstanceKlass* holder = method->method_holder();
1298 if (name == vmSymbols::runWith_method_name()) {
1299 if (holder == vmClasses::Thread_klass()
1300 || holder == resolver.Carrier_klass) {
1301 loc = 1;
1302 }
1303 }
1304
1305 if (loc != -1) {
1306 javaVFrame *frame = vfst.asJavaVFrame();
1307 StackValueCollection* locals = frame->locals();
1308 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1309 Handle result = head_sv->get_obj();
1310 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1311 if (result() != nullptr) {
1312 return JNIHandles::make_local(THREAD, result());
1313 }
1314 }
1315 }
1316
1317 return nullptr;
1318 JVM_END
1319
1320 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1321 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1322 return (k != nullptr) && k->is_array_klass() ? true : false;
1323 JVM_END
1324
1325
1326 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1327 oop mirror = JNIHandles::resolve_non_null(cls);
1328 return (jboolean) java_lang_Class::is_primitive(mirror);
1329 JVM_END
1330
1331
1332 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1333 oop mirror = JNIHandles::resolve_non_null(cls);
1334 if (java_lang_Class::is_primitive(mirror)) {
1335 // Primitive type
1336 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1337 }
1338
1339 Klass* k = java_lang_Class::as_Klass(mirror);
1340 debug_only(int computed_modifiers = k->compute_modifier_flags());
1341 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1342 return k->modifier_flags();
1343 JVM_END
1344
1345
1346 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1347
1348 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1349 JvmtiVMObjectAllocEventCollector oam;
1350 // ofClass is a reference to a java_lang_Class object. The mirror object
1351 // of an InstanceKlass
1352 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1353 if (java_lang_Class::is_primitive(ofMirror) ||
1354 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1355 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1356 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1357 }
1358
1359 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1360 InnerClassesIterator iter(k);
1361
1362 if (iter.length() == 0) {
1363 // Neither an inner nor outer class
1364 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1365 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1366 }
1367
1368 // find inner class info
1369 constantPoolHandle cp(thread, k->constants());
1370 int length = iter.length();
1371
1372 // Allocate temp. result array
1373 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1374 objArrayHandle result (THREAD, r);
1375 int members = 0;
1376
1377 for (; !iter.done(); iter.next()) {
1378 int ioff = iter.inner_class_info_index();
1379 int ooff = iter.outer_class_info_index();
1380
1381 if (ioff != 0 && ooff != 0) {
1382 // Check to see if the name matches the class we're looking for
1383 // before attempting to find the class.
1384 if (cp->klass_name_at_matches(k, ooff)) {
1385 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1386 if (outer_klass == k) {
1387 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1388 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1389
1390 // Throws an exception if outer klass has not declared k as
1391 // an inner klass
1392 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1393
1394 result->obj_at_put(members, inner_klass->java_mirror());
1395 members++;
1396 }
1397 }
1398 }
1399 }
1400
1401 if (members != length) {
1402 // Return array of right length
1403 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1404 for(int i = 0; i < members; i++) {
1405 res->obj_at_put(i, result->obj_at(i));
1406 }
1407 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1408 }
1409
1410 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1411 JVM_END
1412
1413
1414 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1415 {
1416 // ofClass is a reference to a java_lang_Class object.
1417 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1418 if (java_lang_Class::is_primitive(ofMirror)) {
1419 return nullptr;
1420 }
1421 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1422 if (!klass->is_instance_klass()) {
1423 return nullptr;
1424 }
1425
1426 bool inner_is_member = false;
1427 Klass* outer_klass
1428 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1429 if (outer_klass == nullptr) return nullptr; // already a top-level class
1430 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1431 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1432 }
1433 JVM_END
1434
1435 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1436 {
1437 oop mirror = JNIHandles::resolve_non_null(cls);
1438 if (java_lang_Class::is_primitive(mirror)) {
1439 return nullptr;
1440 }
1441 Klass* klass = java_lang_Class::as_Klass(mirror);
1442 if (!klass->is_instance_klass()) {
1443 return nullptr;
1444 }
1445 InstanceKlass* k = InstanceKlass::cast(klass);
1446 int ooff = 0, noff = 0;
1447 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1448 if (noff != 0) {
1449 constantPoolHandle i_cp(thread, k->constants());
1450 Symbol* name = i_cp->symbol_at(noff);
1451 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1452 return (jstring) JNIHandles::make_local(THREAD, str());
1453 }
1454 }
1455 return nullptr;
1456 }
1457 JVM_END
1458
1459 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1460 assert (cls != nullptr, "illegal class");
1461 JvmtiVMObjectAllocEventCollector oam;
1462 ResourceMark rm(THREAD);
1463 oop mirror = JNIHandles::resolve_non_null(cls);
1464 // Return null for arrays and primitives
1465 if (!java_lang_Class::is_primitive(mirror)) {
1466 Klass* k = java_lang_Class::as_Klass(mirror);
1467 if (k->is_instance_klass()) {
1468 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1469 if (sym == nullptr) return nullptr;
1470 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1471 return (jstring) JNIHandles::make_local(THREAD, str());
1472 }
1473 }
1474 return nullptr;
1475 JVM_END
1476
1477
1478 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1479 assert (cls != nullptr, "illegal class");
1480 oop mirror = JNIHandles::resolve_non_null(cls);
1481 // Return null for arrays and primitives
1482 if (!java_lang_Class::is_primitive(mirror)) {
1483 Klass* k = java_lang_Class::as_Klass(mirror);
1484 if (k->is_instance_klass()) {
1485 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1486 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1487 }
1488 }
1489 return nullptr;
1490 JVM_END
1491
1492
1493 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1494 // some of this code was adapted from from jni_FromReflectedField
1495
1496 oop reflected = JNIHandles::resolve_non_null(field);
1497 oop mirror = java_lang_reflect_Field::clazz(reflected);
1498 Klass* k = java_lang_Class::as_Klass(mirror);
1499 int slot = java_lang_reflect_Field::slot(reflected);
1500 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1501
1502 InstanceKlass* ik = InstanceKlass::cast(k);
1503 int offset = ik->field_offset(slot);
1504
1505 if (modifiers & JVM_ACC_STATIC) {
1506 // for static fields we only look in the current class
1507 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1508 assert(false, "cannot find static field");
1509 return false;
1510 }
1511 } else {
1512 // for instance fields we start with the current class and work
1513 // our way up through the superclass chain
1514 if (!ik->find_field_from_offset(offset, false, &fd)) {
1515 assert(false, "cannot find instance field");
1516 return false;
1517 }
1518 }
1519 return true;
1520 }
1521
1522 static Method* jvm_get_method_common(jobject method) {
1523 // some of this code was adapted from from jni_FromReflectedMethod
1524
1525 oop reflected = JNIHandles::resolve_non_null(method);
1526 oop mirror = nullptr;
1527 int slot = 0;
1528
1529 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1530 mirror = java_lang_reflect_Constructor::clazz(reflected);
1531 slot = java_lang_reflect_Constructor::slot(reflected);
1532 } else {
1533 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1534 "wrong type");
1535 mirror = java_lang_reflect_Method::clazz(reflected);
1536 slot = java_lang_reflect_Method::slot(reflected);
1537 }
1538 Klass* k = java_lang_Class::as_Klass(mirror);
1539
1540 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1541 assert(m != nullptr, "cannot find method");
1542 return m; // caller has to deal with null in product mode
1543 }
1544
1545 /* Type use annotations support (JDK 1.8) */
1546
1547 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1548 assert (cls != nullptr, "illegal class");
1549 ResourceMark rm(THREAD);
1550 // Return null for arrays and primitives
1551 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1552 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1553 if (k->is_instance_klass()) {
1554 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1555 if (type_annotations != nullptr) {
1556 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1557 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1558 }
1559 }
1560 }
1561 return nullptr;
1562 JVM_END
1563
1564 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1565 assert (method != nullptr, "illegal method");
1566 // method is a handle to a java.lang.reflect.Method object
1567 Method* m = jvm_get_method_common(method);
1568 if (m == nullptr) {
1569 return nullptr;
1570 }
1571
1572 AnnotationArray* type_annotations = m->type_annotations();
1573 if (type_annotations != nullptr) {
1574 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1575 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1576 }
1577
1578 return nullptr;
1579 JVM_END
1580
1581 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1582 assert (field != nullptr, "illegal field");
1583 fieldDescriptor fd;
1584 bool gotFd = jvm_get_field_common(field, fd);
1585 if (!gotFd) {
1586 return nullptr;
1587 }
1588
1589 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1590 JVM_END
1591
1592 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1593 if (!cp->is_within_bounds(index)) {
1594 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1595 }
1596 }
1597
1598 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1599 {
1600 // method is a handle to a java.lang.reflect.Method object
1601 Method* method_ptr = jvm_get_method_common(method);
1602 methodHandle mh (THREAD, method_ptr);
1603 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1604 const int num_params = mh->method_parameters_length();
1605
1606 if (num_params < 0) {
1607 // A -1 return value from method_parameters_length means there is no
1608 // parameter data. Return null to indicate this to the reflection
1609 // API.
1610 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1611 return (jobjectArray)nullptr;
1612 } else {
1613 // Otherwise, we return something up to reflection, even if it is
1614 // a zero-length array. Why? Because in some cases this can
1615 // trigger a MalformedParametersException.
1616
1617 // make sure all the symbols are properly formatted
1618 for (int i = 0; i < num_params; i++) {
1619 MethodParametersElement* params = mh->method_parameters_start();
1620 int index = params[i].name_cp_index;
1621 constantPoolHandle cp(THREAD, mh->constants());
1622 bounds_check(cp, index, CHECK_NULL);
1623
1624 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1625 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1626 "Wrong type at constant pool index");
1627 }
1628
1629 }
1630
1631 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1632 objArrayHandle result (THREAD, result_oop);
1633
1634 for (int i = 0; i < num_params; i++) {
1635 MethodParametersElement* params = mh->method_parameters_start();
1636 // For a 0 index, give a null symbol
1637 Symbol* sym = 0 != params[i].name_cp_index ?
1638 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1639 int flags = params[i].flags;
1640 oop param = Reflection::new_parameter(reflected_method, i, sym,
1641 flags, CHECK_NULL);
1642 result->obj_at_put(i, param);
1643 }
1644 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1645 }
1646 }
1647 JVM_END
1648
1649 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1650
1651 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1652 {
1653 JvmtiVMObjectAllocEventCollector oam;
1654
1655 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1656 // Exclude primitive types and array types
1657 if (java_lang_Class::is_primitive(ofMirror) ||
1658 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1659 // Return empty array
1660 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1661 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1662 }
1663
1664 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1665 constantPoolHandle cp(THREAD, k->constants());
1666
1667 // Ensure class is linked
1668 k->link_class(CHECK_NULL);
1669
1670 // Allocate result
1671 int num_fields;
1672
1673 if (publicOnly) {
1674 num_fields = 0;
1675 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1676 if (fs.access_flags().is_public()) ++num_fields;
1677 }
1678 } else {
1679 num_fields = k->java_fields_count();
1680 }
1681
1682 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1683 objArrayHandle result (THREAD, r);
1684
1685 int out_idx = 0;
1686 fieldDescriptor fd;
1687 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1688 if (!publicOnly || fs.access_flags().is_public()) {
1689 fd.reinitialize(k, fs.index());
1690 oop field = Reflection::new_field(&fd, CHECK_NULL);
1691 result->obj_at_put(out_idx, field);
1692 ++out_idx;
1693 }
1694 }
1695 assert(out_idx == num_fields, "just checking");
1696 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1697 }
1698 JVM_END
1699
1700 // A class is a record if and only if it is final and a direct subclass of
1701 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1702 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1703 {
1704 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1705 if (k != nullptr && k->is_instance_klass()) {
1706 InstanceKlass* ik = InstanceKlass::cast(k);
1707 return ik->is_record();
1708 } else {
1709 return false;
1710 }
1711 }
1712 JVM_END
1713
1714 // Returns an array containing the components of the Record attribute,
1715 // or null if the attribute is not present.
1716 //
1717 // Note that this function returns the components of the Record attribute
1718 // even if the class is not a record.
1719 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1720 {
1721 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1722 assert(c->is_instance_klass(), "must be");
1723 InstanceKlass* ik = InstanceKlass::cast(c);
1724
1725 Array<RecordComponent*>* components = ik->record_components();
1726 if (components != nullptr) {
1727 JvmtiVMObjectAllocEventCollector oam;
1728 constantPoolHandle cp(THREAD, ik->constants());
1729 int length = components->length();
1730 assert(length >= 0, "unexpected record_components length");
1731 objArrayOop record_components =
1732 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1733 objArrayHandle components_h (THREAD, record_components);
1734
1735 for (int x = 0; x < length; x++) {
1736 RecordComponent* component = components->at(x);
1737 assert(component != nullptr, "unexpected null record component");
1738 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1739 components_h->obj_at_put(x, component_oop);
1740 }
1741 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1742 }
1743
1744 return nullptr;
1745 }
1746 JVM_END
1747
1748 static jobjectArray get_class_declared_methods_helper(
1749 JNIEnv *env,
1750 jclass ofClass, jboolean publicOnly,
1751 bool want_constructor,
1752 Klass* klass, TRAPS) {
1753
1754 JvmtiVMObjectAllocEventCollector oam;
1755
1756 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1757 // Exclude primitive types and array types
1758 if (java_lang_Class::is_primitive(ofMirror)
1759 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1760 // Return empty array
1761 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1762 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1763 }
1764
1765 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1766
1767 // Ensure class is linked
1768 k->link_class(CHECK_NULL);
1769
1770 Array<Method*>* methods = k->methods();
1771 int methods_length = methods->length();
1772
1773 // Save original method_idnum in case of redefinition, which can change
1774 // the idnum of obsolete methods. The new method will have the same idnum
1775 // but if we refresh the methods array, the counts will be wrong.
1776 ResourceMark rm(THREAD);
1777 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1778 int num_methods = 0;
1779
1780 // Select methods matching the criteria.
1781 for (int i = 0; i < methods_length; i++) {
1782 Method* method = methods->at(i);
1783 if (want_constructor && !method->is_object_initializer()) {
1784 continue;
1785 }
1786 if (!want_constructor &&
1787 (method->is_object_initializer() || method->is_static_initializer() ||
1788 method->is_overpass())) {
1789 continue;
1790 }
1791 if (publicOnly && !method->is_public()) {
1792 continue;
1793 }
1794 idnums->push(method->method_idnum());
1795 ++num_methods;
1796 }
1797
1798 // Allocate result
1799 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1800 objArrayHandle result (THREAD, r);
1801
1802 // Now just put the methods that we selected above, but go by their idnum
1803 // in case of redefinition. The methods can be redefined at any safepoint,
1804 // so above when allocating the oop array and below when creating reflect
1805 // objects.
1806 for (int i = 0; i < num_methods; i++) {
1807 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1808 if (method.is_null()) {
1809 // Method may have been deleted and seems this API can handle null
1810 // Otherwise should probably put a method that throws NSME
1811 result->obj_at_put(i, nullptr);
1812 } else {
1813 oop m;
1814 if (want_constructor) {
1815 m = Reflection::new_constructor(method, CHECK_NULL);
1816 } else {
1817 m = Reflection::new_method(method, false, CHECK_NULL);
1818 }
1819 result->obj_at_put(i, m);
1820 }
1821 }
1822
1823 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1824 }
1825
1826 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1827 {
1828 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1829 /*want_constructor*/ false,
1830 vmClasses::reflect_Method_klass(), THREAD);
1831 }
1832 JVM_END
1833
1834 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1835 {
1836 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1837 /*want_constructor*/ true,
1838 vmClasses::reflect_Constructor_klass(), THREAD);
1839 }
1840 JVM_END
1841
1842 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1843 {
1844 oop mirror = JNIHandles::resolve_non_null(cls);
1845 if (java_lang_Class::is_primitive(mirror)) {
1846 // Primitive type
1847 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1848 }
1849
1850 Klass* k = java_lang_Class::as_Klass(mirror);
1851 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1852 }
1853 JVM_END
1854
1855 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1856 {
1857 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1858 assert(c->is_instance_klass(), "must be");
1859 InstanceKlass* ck = InstanceKlass::cast(c);
1860 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1861 assert(m->is_instance_klass(), "must be");
1862 InstanceKlass* mk = InstanceKlass::cast(m);
1863 return ck->has_nestmate_access_to(mk, THREAD);
1864 }
1865 JVM_END
1866
1867 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1868 {
1869 // current is not a primitive or array class
1870 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1871 assert(c->is_instance_klass(), "must be");
1872 InstanceKlass* ck = InstanceKlass::cast(c);
1873 InstanceKlass* host = ck->nest_host(THREAD);
1874 return (jclass) (host == nullptr ? nullptr :
1875 JNIHandles::make_local(THREAD, host->java_mirror()));
1876 }
1877 JVM_END
1878
1879 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1880 {
1881 // current is not a primitive or array class
1882 ResourceMark rm(THREAD);
1883 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1884 assert(c->is_instance_klass(), "must be");
1885 InstanceKlass* ck = InstanceKlass::cast(c);
1886 InstanceKlass* host = ck->nest_host(THREAD);
1887
1888 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1889 ck->external_name(), host->external_name());
1890 {
1891 JvmtiVMObjectAllocEventCollector oam;
1892 Array<u2>* members = host->nest_members();
1893 int length = members == nullptr ? 0 : members->length();
1894
1895 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1896
1897 // nest host is first in the array so make it one bigger
1898 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1899 length + 1, CHECK_NULL);
1900 objArrayHandle result(THREAD, r);
1901 result->obj_at_put(0, host->java_mirror());
1902 if (length != 0) {
1903 int count = 0;
1904 for (int i = 0; i < length; i++) {
1905 int cp_index = members->at(i);
1906 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1907 if (HAS_PENDING_EXCEPTION) {
1908 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1909 return nullptr; // propagate VMEs
1910 }
1911 if (log_is_enabled(Trace, class, nestmates)) {
1912 stringStream ss;
1913 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1914 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1915 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1916 log_trace(class, nestmates)("%s", ss.as_string());
1917 }
1918 CLEAR_PENDING_EXCEPTION;
1919 continue;
1920 }
1921 if (k->is_instance_klass()) {
1922 InstanceKlass* ik = InstanceKlass::cast(k);
1923 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1924 if (nest_host_k == host) {
1925 result->obj_at_put(count+1, k->java_mirror());
1926 count++;
1927 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1928 } else {
1929 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1930 ik->external_name(), nest_host_k->external_name());
1931 }
1932 } else {
1933 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1934 k->external_name());
1935 }
1936 }
1937 if (count < length) {
1938 // we had invalid entries so we need to compact the array
1939 log_trace(class, nestmates)(" - compacting array from length %d to %d",
1940 length + 1, count + 1);
1941
1942 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1943 count + 1, CHECK_NULL);
1944 objArrayHandle result2(THREAD, r2);
1945 for (int i = 0; i < count + 1; i++) {
1946 result2->obj_at_put(i, result->obj_at(i));
1947 }
1948 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1949 }
1950 }
1951 else {
1952 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
1953 }
1954 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1955 }
1956 }
1957 JVM_END
1958
1959 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
1960 {
1961 oop mirror = JNIHandles::resolve_non_null(current);
1962 assert(!java_lang_Class::is_primitive(mirror), "should not be");
1963 Klass* c = java_lang_Class::as_Klass(mirror);
1964 assert(c->is_instance_klass(), "must be");
1965 InstanceKlass* ik = InstanceKlass::cast(c);
1966 ResourceMark rm(THREAD);
1967 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
1968 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
1969 if (ik->is_sealed()) {
1970 JvmtiVMObjectAllocEventCollector oam;
1971 Array<u2>* subclasses = ik->permitted_subclasses();
1972 int length = subclasses->length();
1973
1974 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
1975
1976 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1977 length, CHECK_NULL);
1978 objArrayHandle result(THREAD, r);
1979 int count = 0;
1980 for (int i = 0; i < length; i++) {
1981 int cp_index = subclasses->at(i);
1982 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
1983 if (HAS_PENDING_EXCEPTION) {
1984 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1985 return nullptr; // propagate VMEs
1986 }
1987 if (log_is_enabled(Trace, class, sealed)) {
1988 stringStream ss;
1989 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
1990 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
1991 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1992 log_trace(class, sealed)("%s", ss.as_string());
1993 }
1994
1995 CLEAR_PENDING_EXCEPTION;
1996 continue;
1997 }
1998 if (k->is_instance_klass()) {
1999 result->obj_at_put(count++, k->java_mirror());
2000 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2001 }
2002 }
2003 if (count < length) {
2004 // we had invalid entries so we need to compact the array
2005 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2006 count, CHECK_NULL);
2007 objArrayHandle result2(THREAD, r2);
2008 for (int i = 0; i < count; i++) {
2009 result2->obj_at_put(i, result->obj_at(i));
2010 }
2011 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2012 }
2013 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2014 } else {
2015 return nullptr;
2016 }
2017 }
2018 JVM_END
2019
2020 // Constant pool access //////////////////////////////////////////////////////////
2021
2022 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2023 {
2024 JvmtiVMObjectAllocEventCollector oam;
2025 oop mirror = JNIHandles::resolve_non_null(cls);
2026 // Return null for primitives and arrays
2027 if (!java_lang_Class::is_primitive(mirror)) {
2028 Klass* k = java_lang_Class::as_Klass(mirror);
2029 if (k->is_instance_klass()) {
2030 InstanceKlass* k_h = InstanceKlass::cast(k);
2031 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2032 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2033 return JNIHandles::make_local(THREAD, jcp());
2034 }
2035 }
2036 return nullptr;
2037 }
2038 JVM_END
2039
2040
2041 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2042 {
2043 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2044 return cp->length();
2045 }
2046 JVM_END
2047
2048
2049 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2050 {
2051 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2052 bounds_check(cp, index, CHECK_NULL);
2053 constantTag tag = cp->tag_at(index);
2054 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2055 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2056 }
2057 Klass* k = cp->klass_at(index, CHECK_NULL);
2058 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2059 }
2060 JVM_END
2061
2062 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2063 {
2064 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2065 bounds_check(cp, index, CHECK_NULL);
2066 constantTag tag = cp->tag_at(index);
2067 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2068 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2069 }
2070 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2071 if (k == nullptr) return nullptr;
2072 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2073 }
2074 JVM_END
2075
2076 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2077 constantTag tag = cp->tag_at(index);
2078 if (!tag.is_method() && !tag.is_interface_method()) {
2079 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2080 }
2081 int klass_ref = cp->uncached_klass_ref_index_at(index);
2082 Klass* k_o;
2083 if (force_resolution) {
2084 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2085 } else {
2086 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2087 if (k_o == nullptr) return nullptr;
2088 }
2089 InstanceKlass* k = InstanceKlass::cast(k_o);
2090 Symbol* name = cp->uncached_name_ref_at(index);
2091 Symbol* sig = cp->uncached_signature_ref_at(index);
2092 methodHandle m (THREAD, k->find_method(name, sig));
2093 if (m.is_null()) {
2094 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2095 }
2096 oop method;
2097 if (m->is_object_initializer()) {
2098 method = Reflection::new_constructor(m, CHECK_NULL);
2099 } else {
2100 // new_method accepts <clinit> as Method here
2101 method = Reflection::new_method(m, true, CHECK_NULL);
2102 }
2103 return JNIHandles::make_local(THREAD, method);
2104 }
2105
2106 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2107 {
2108 JvmtiVMObjectAllocEventCollector oam;
2109 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2110 bounds_check(cp, index, CHECK_NULL);
2111 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2112 return res;
2113 }
2114 JVM_END
2115
2116 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2117 {
2118 JvmtiVMObjectAllocEventCollector oam;
2119 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2120 bounds_check(cp, index, CHECK_NULL);
2121 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2122 return res;
2123 }
2124 JVM_END
2125
2126 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2127 constantTag tag = cp->tag_at(index);
2128 if (!tag.is_field()) {
2129 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2130 }
2131 int klass_ref = cp->uncached_klass_ref_index_at(index);
2132 Klass* k_o;
2133 if (force_resolution) {
2134 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2135 } else {
2136 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2137 if (k_o == nullptr) return nullptr;
2138 }
2139 InstanceKlass* k = InstanceKlass::cast(k_o);
2140 Symbol* name = cp->uncached_name_ref_at(index);
2141 Symbol* sig = cp->uncached_signature_ref_at(index);
2142 fieldDescriptor fd;
2143 Klass* target_klass = k->find_field(name, sig, &fd);
2144 if (target_klass == nullptr) {
2145 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2146 }
2147 oop field = Reflection::new_field(&fd, CHECK_NULL);
2148 return JNIHandles::make_local(THREAD, field);
2149 }
2150
2151 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2152 {
2153 JvmtiVMObjectAllocEventCollector oam;
2154 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2155 bounds_check(cp, index, CHECK_NULL);
2156 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2157 return res;
2158 }
2159 JVM_END
2160
2161 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2162 {
2163 JvmtiVMObjectAllocEventCollector oam;
2164 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2165 bounds_check(cp, index, CHECK_NULL);
2166 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2167 return res;
2168 }
2169 JVM_END
2170
2171 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2172 {
2173 JvmtiVMObjectAllocEventCollector oam;
2174 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2175 bounds_check(cp, index, CHECK_NULL);
2176 constantTag tag = cp->tag_at(index);
2177 if (!tag.is_field_or_method()) {
2178 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2179 }
2180 int klass_ref = cp->uncached_klass_ref_index_at(index);
2181 Symbol* klass_name = cp->klass_name_at(klass_ref);
2182 Symbol* member_name = cp->uncached_name_ref_at(index);
2183 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2184 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2185 objArrayHandle dest(THREAD, dest_o);
2186 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2187 dest->obj_at_put(0, str());
2188 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2189 dest->obj_at_put(1, str());
2190 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2191 dest->obj_at_put(2, str());
2192 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2193 }
2194 JVM_END
2195
2196 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2197 {
2198 JvmtiVMObjectAllocEventCollector oam;
2199 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2200 bounds_check(cp, index, CHECK_0);
2201 constantTag tag = cp->tag_at(index);
2202 if (!tag.is_field_or_method()) {
2203 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2204 }
2205 return (jint) cp->uncached_klass_ref_index_at(index);
2206 }
2207 JVM_END
2208
2209 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2210 {
2211 JvmtiVMObjectAllocEventCollector oam;
2212 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2213 bounds_check(cp, index, CHECK_0);
2214 constantTag tag = cp->tag_at(index);
2215 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2216 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2217 }
2218 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2219 }
2220 JVM_END
2221
2222 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2223 {
2224 JvmtiVMObjectAllocEventCollector oam;
2225 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2226 bounds_check(cp, index, CHECK_NULL);
2227 constantTag tag = cp->tag_at(index);
2228 if (!tag.is_name_and_type()) {
2229 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2230 }
2231 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2232 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2233 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2234 objArrayHandle dest(THREAD, dest_o);
2235 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2236 dest->obj_at_put(0, str());
2237 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2238 dest->obj_at_put(1, str());
2239 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2240 }
2241 JVM_END
2242
2243 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2244 {
2245 constantPoolHandle cp = constantPoolHandle(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_int()) {
2249 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2250 }
2251 return cp->int_at(index);
2252 }
2253 JVM_END
2254
2255 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2256 {
2257 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2258 bounds_check(cp, index, CHECK_(0L));
2259 constantTag tag = cp->tag_at(index);
2260 if (!tag.is_long()) {
2261 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2262 }
2263 return cp->long_at(index);
2264 }
2265 JVM_END
2266
2267 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2268 {
2269 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2270 bounds_check(cp, index, CHECK_(0.0f));
2271 constantTag tag = cp->tag_at(index);
2272 if (!tag.is_float()) {
2273 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2274 }
2275 return cp->float_at(index);
2276 }
2277 JVM_END
2278
2279 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2280 {
2281 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2282 bounds_check(cp, index, CHECK_(0.0));
2283 constantTag tag = cp->tag_at(index);
2284 if (!tag.is_double()) {
2285 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2286 }
2287 return cp->double_at(index);
2288 }
2289 JVM_END
2290
2291 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2292 {
2293 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2294 bounds_check(cp, index, CHECK_NULL);
2295 constantTag tag = cp->tag_at(index);
2296 if (!tag.is_string()) {
2297 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2298 }
2299 oop str = cp->string_at(index, CHECK_NULL);
2300 return (jstring) JNIHandles::make_local(THREAD, str);
2301 }
2302 JVM_END
2303
2304 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2305 {
2306 JvmtiVMObjectAllocEventCollector oam;
2307 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2308 bounds_check(cp, index, CHECK_NULL);
2309 constantTag tag = cp->tag_at(index);
2310 if (!tag.is_symbol()) {
2311 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2312 }
2313 Symbol* sym = cp->symbol_at(index);
2314 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2315 return (jstring) JNIHandles::make_local(THREAD, str());
2316 }
2317 JVM_END
2318
2319 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2320 {
2321 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2322 bounds_check(cp, index, CHECK_0);
2323 constantTag tag = cp->tag_at(index);
2324 jbyte result = tag.value();
2325 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2326 // they are changed to the corresponding tags from the JVM spec, so that java code in
2327 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2328 if (tag.is_klass_or_reference()) {
2329 result = JVM_CONSTANT_Class;
2330 } else if (tag.is_string_index()) {
2331 result = JVM_CONSTANT_String;
2332 } else if (tag.is_method_type_in_error()) {
2333 result = JVM_CONSTANT_MethodType;
2334 } else if (tag.is_method_handle_in_error()) {
2335 result = JVM_CONSTANT_MethodHandle;
2336 } else if (tag.is_dynamic_constant_in_error()) {
2337 result = JVM_CONSTANT_Dynamic;
2338 }
2339 return result;
2340 }
2341 JVM_END
2342
2343 // Assertion support. //////////////////////////////////////////////////////////
2344
2345 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2346 assert(cls != nullptr, "bad class");
2347
2348 oop r = JNIHandles::resolve(cls);
2349 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2350 if (java_lang_Class::is_primitive(r)) return false;
2351
2352 Klass* k = java_lang_Class::as_Klass(r);
2353 assert(k->is_instance_klass(), "must be an instance klass");
2354 if (!k->is_instance_klass()) return false;
2355
2356 ResourceMark rm(THREAD);
2357 const char* name = k->name()->as_C_string();
2358 bool system_class = k->class_loader() == nullptr;
2359 return JavaAssertions::enabled(name, system_class);
2360
2361 JVM_END
2362
2363
2364 // Return a new AssertionStatusDirectives object with the fields filled in with
2365 // command-line assertion arguments (i.e., -ea, -da).
2366 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2367 JvmtiVMObjectAllocEventCollector oam;
2368 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2369 return JNIHandles::make_local(THREAD, asd);
2370 JVM_END
2371
2372 // Verification ////////////////////////////////////////////////////////////////////////////////
2373
2374 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2375
2376 // RedefineClasses support: bug 6214132 caused verification to fail.
2377 // All functions from this section should call the jvmtiThreadSate function:
2378 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2379 // The function returns a Klass* of the _scratch_class if the verifier
2380 // was invoked in the middle of the class redefinition.
2381 // Otherwise it returns its argument value which is the _the_class Klass*.
2382 // Please, refer to the description in the jvmtiThreadSate.hpp.
2383
2384 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2385 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2386 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2387 return k->name()->as_utf8();
2388 JVM_END
2389
2390
2391 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2392 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2393 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2394 // types will have length zero if this is not an InstanceKlass
2395 // (length is determined by call to JVM_GetClassCPEntriesCount)
2396 if (k->is_instance_klass()) {
2397 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2398 for (int index = cp->length() - 1; index >= 0; index--) {
2399 constantTag tag = cp->tag_at(index);
2400 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2401 }
2402 }
2403 JVM_END
2404
2405
2406 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2407 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2408 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2409 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2410 JVM_END
2411
2412
2413 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2414 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2415 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2416 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2417 JVM_END
2418
2419
2420 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2421 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2422 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2423 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2424 JVM_END
2425
2426
2427 // The following methods, used for the verifier, are never called with
2428 // array klasses, so a direct cast to InstanceKlass is safe.
2429 // Typically, these methods are called in a loop with bounds determined
2430 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2431 // zero for arrays.
2432 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2433 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2434 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2435 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2436 int length = method->checked_exceptions_length();
2437 if (length > 0) {
2438 CheckedExceptionElement* table= method->checked_exceptions_start();
2439 for (int i = 0; i < length; i++) {
2440 exceptions[i] = table[i].class_cp_index;
2441 }
2442 }
2443 JVM_END
2444
2445
2446 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2447 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2448 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2449 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2450 return method->checked_exceptions_length();
2451 JVM_END
2452
2453
2454 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2455 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2456 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2457 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2458 memcpy(code, method->code_base(), method->code_size());
2459 JVM_END
2460
2461
2462 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2463 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2464 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2465 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2466 return method->code_size();
2467 JVM_END
2468
2469
2470 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2471 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2472 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2473 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2474 ExceptionTable extable(method);
2475 entry->start_pc = extable.start_pc(entry_index);
2476 entry->end_pc = extable.end_pc(entry_index);
2477 entry->handler_pc = extable.handler_pc(entry_index);
2478 entry->catchType = extable.catch_type_index(entry_index);
2479 JVM_END
2480
2481
2482 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2483 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2484 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2485 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2486 return method->exception_table_length();
2487 JVM_END
2488
2489
2490 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2491 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2492 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2493 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2494 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2495 JVM_END
2496
2497
2498 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2499 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2500 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2501 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2502 JVM_END
2503
2504
2505 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2506 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2507 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2508 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2509 return method->max_locals();
2510 JVM_END
2511
2512
2513 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2514 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2515 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2516 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2517 return method->size_of_parameters();
2518 JVM_END
2519
2520
2521 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2522 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2523 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2524 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2525 return method->verifier_max_stack();
2526 JVM_END
2527
2528
2529 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2530 ResourceMark rm(THREAD);
2531 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2532 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2533 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2534 return method->name() == vmSymbols::object_initializer_name();
2535 JVM_END
2536
2537
2538 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2539 ResourceMark rm(THREAD);
2540 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2541 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2542 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2543 return method->is_overpass();
2544 JVM_END
2545
2546 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2547 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2548 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2549 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2550 return method->name()->as_utf8();
2551 JVM_END
2552
2553
2554 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2555 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2556 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2557 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2558 return method->signature()->as_utf8();
2559 JVM_END
2560
2561 /**
2562 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2563 * read entries in the constant pool. Since the old verifier always
2564 * works on a copy of the code, it will not see any rewriting that
2565 * may possibly occur in the middle of verification. So it is important
2566 * that nothing it calls tries to use the cpCache instead of the raw
2567 * constant pool, so we must use cp->uncached_x methods when appropriate.
2568 */
2569 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2570 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2571 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2572 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2573 switch (cp->tag_at(cp_index).value()) {
2574 case JVM_CONSTANT_Fieldref:
2575 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2576 default:
2577 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2578 }
2579 ShouldNotReachHere();
2580 return nullptr;
2581 JVM_END
2582
2583
2584 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2585 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2586 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2587 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2588 switch (cp->tag_at(cp_index).value()) {
2589 case JVM_CONSTANT_InterfaceMethodref:
2590 case JVM_CONSTANT_Methodref:
2591 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2592 default:
2593 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2594 }
2595 ShouldNotReachHere();
2596 return nullptr;
2597 JVM_END
2598
2599
2600 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_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 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2604 switch (cp->tag_at(cp_index).value()) {
2605 case JVM_CONSTANT_InterfaceMethodref:
2606 case JVM_CONSTANT_Methodref:
2607 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2608 default:
2609 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2610 }
2611 ShouldNotReachHere();
2612 return nullptr;
2613 JVM_END
2614
2615
2616 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2617 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2618 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2619 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2620 switch (cp->tag_at(cp_index).value()) {
2621 case JVM_CONSTANT_Fieldref:
2622 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2623 default:
2624 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2625 }
2626 ShouldNotReachHere();
2627 return nullptr;
2628 JVM_END
2629
2630
2631 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2632 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2633 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2634 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2635 Symbol* classname = cp->klass_name_at(cp_index);
2636 return classname->as_utf8();
2637 JVM_END
2638
2639
2640 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2641 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2642 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2643 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2644 switch (cp->tag_at(cp_index).value()) {
2645 case JVM_CONSTANT_Fieldref: {
2646 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2647 Symbol* classname = cp->klass_name_at(class_index);
2648 return classname->as_utf8();
2649 }
2650 default:
2651 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2652 }
2653 ShouldNotReachHere();
2654 return nullptr;
2655 JVM_END
2656
2657
2658 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2659 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2660 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2661 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2662 switch (cp->tag_at(cp_index).value()) {
2663 case JVM_CONSTANT_Methodref:
2664 case JVM_CONSTANT_InterfaceMethodref: {
2665 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2666 Symbol* classname = cp->klass_name_at(class_index);
2667 return classname->as_utf8();
2668 }
2669 default:
2670 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2671 }
2672 ShouldNotReachHere();
2673 return nullptr;
2674 JVM_END
2675
2676
2677 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2678 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2679 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2680 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2681 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2682 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2683 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2684 switch (cp->tag_at(cp_index).value()) {
2685 case JVM_CONSTANT_Fieldref: {
2686 Symbol* name = cp->uncached_name_ref_at(cp_index);
2687 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2688 InstanceKlass* ik = InstanceKlass::cast(k_called);
2689 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2690 if (fs.name() == name && fs.signature() == signature) {
2691 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2692 }
2693 }
2694 return -1;
2695 }
2696 default:
2697 fatal("JVM_GetCPFieldModifiers: illegal constant");
2698 }
2699 ShouldNotReachHere();
2700 return 0;
2701 JVM_END
2702
2703
2704 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2705 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2706 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2707 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2708 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2709 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2710 switch (cp->tag_at(cp_index).value()) {
2711 case JVM_CONSTANT_Methodref:
2712 case JVM_CONSTANT_InterfaceMethodref: {
2713 Symbol* name = cp->uncached_name_ref_at(cp_index);
2714 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2715 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2716 int methods_count = methods->length();
2717 for (int i = 0; i < methods_count; i++) {
2718 Method* method = methods->at(i);
2719 if (method->name() == name && method->signature() == signature) {
2720 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2721 }
2722 }
2723 return -1;
2724 }
2725 default:
2726 fatal("JVM_GetCPMethodModifiers: illegal constant");
2727 }
2728 ShouldNotReachHere();
2729 return 0;
2730 JVM_END
2731
2732
2733 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2734
2735 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2736 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2737 JVM_END
2738
2739
2740 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2741 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2742 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2743 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2744 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2745 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2746 JVM_END
2747
2748 // Printing support //////////////////////////////////////////////////
2749 extern "C" {
2750
2751 ATTRIBUTE_PRINTF(3, 0)
2752 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2753 // Reject count values that are negative signed values converted to
2754 // unsigned; see bug 4399518, 4417214
2755 if ((intptr_t)count <= 0) return -1;
2756
2757 int result = os::vsnprintf(str, count, fmt, args);
2758 if (result > 0 && (size_t)result >= count) {
2759 result = -1;
2760 }
2761
2762 return result;
2763 }
2764
2765 ATTRIBUTE_PRINTF(3, 4)
2766 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2767 va_list args;
2768 int len;
2769 va_start(args, fmt);
2770 len = jio_vsnprintf(str, count, fmt, args);
2771 va_end(args);
2772 return len;
2773 }
2774
2775 ATTRIBUTE_PRINTF(2, 3)
2776 int jio_fprintf(FILE* f, const char *fmt, ...) {
2777 int len;
2778 va_list args;
2779 va_start(args, fmt);
2780 len = jio_vfprintf(f, fmt, args);
2781 va_end(args);
2782 return len;
2783 }
2784
2785 ATTRIBUTE_PRINTF(2, 0)
2786 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2787 if (Arguments::vfprintf_hook() != nullptr) {
2788 return Arguments::vfprintf_hook()(f, fmt, args);
2789 } else {
2790 return vfprintf(f, fmt, args);
2791 }
2792 }
2793
2794 ATTRIBUTE_PRINTF(1, 2)
2795 JNIEXPORT int jio_printf(const char *fmt, ...) {
2796 int len;
2797 va_list args;
2798 va_start(args, fmt);
2799 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2800 va_end(args);
2801 return len;
2802 }
2803
2804 // HotSpot specific jio method
2805 void jio_print(const char* s, size_t len) {
2806 // Try to make this function as atomic as possible.
2807 if (Arguments::vfprintf_hook() != nullptr) {
2808 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2809 } else {
2810 // Make an unused local variable to avoid warning from gcc compiler.
2811 bool dummy = os::write(defaultStream::output_fd(), s, len);
2812 }
2813 }
2814
2815 } // Extern C
2816
2817 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2818
2819 // In most of the JVM thread support functions we need to access the
2820 // thread through a ThreadsListHandle to prevent it from exiting and
2821 // being reclaimed while we try to operate on it. The exceptions to this
2822 // rule are when operating on the current thread, or if the monitor of
2823 // the target java.lang.Thread is locked at the Java level - in both
2824 // cases the target cannot exit.
2825
2826 static void thread_entry(JavaThread* thread, TRAPS) {
2827 HandleMark hm(THREAD);
2828 Handle obj(THREAD, thread->threadObj());
2829 JavaValue result(T_VOID);
2830 JavaCalls::call_virtual(&result,
2831 obj,
2832 vmClasses::Thread_klass(),
2833 vmSymbols::run_method_name(),
2834 vmSymbols::void_method_signature(),
2835 THREAD);
2836 }
2837
2838
2839 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2840 #if INCLUDE_CDS
2841 if (CDSConfig::allow_only_single_java_thread()) {
2842 // During java -Xshare:dump, if we allow multiple Java threads to
2843 // execute in parallel, symbols and classes may be loaded in
2844 // random orders which will make the resulting CDS archive
2845 // non-deterministic.
2846 //
2847 // Lucikly, during java -Xshare:dump, it's important to run only
2848 // the code in the main Java thread (which is NOT started here) that
2849 // creates the module graph, etc. It's safe to not start the other
2850 // threads which are launched by class static initializers
2851 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2852 if (log_is_enabled(Info, cds)) {
2853 ResourceMark rm;
2854 oop t = JNIHandles::resolve_non_null(jthread);
2855 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2856 }
2857 return;
2858 }
2859 #endif
2860 JavaThread *native_thread = nullptr;
2861
2862 // We cannot hold the Threads_lock when we throw an exception,
2863 // due to rank ordering issues. Example: we might need to grab the
2864 // Heap_lock while we construct the exception.
2865 bool throw_illegal_thread_state = false;
2866
2867 // We must release the Threads_lock before we can post a jvmti event
2868 // in Thread::start.
2869 {
2870 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2871 // Ensure that the C++ Thread and OSThread structures aren't freed before
2872 // we operate.
2873 MutexLocker ml(Threads_lock);
2874
2875 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2876 // re-starting an already started thread, so we should usually find
2877 // that the JavaThread is null. However for a JNI attached thread
2878 // there is a small window between the Thread object being created
2879 // (with its JavaThread set) and the update to its threadStatus, so we
2880 // have to check for this
2881 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2882 throw_illegal_thread_state = true;
2883 } else {
2884 jlong size =
2885 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2886 // Allocate the C++ Thread structure and create the native thread. The
2887 // stack size retrieved from java is 64-bit signed, but the constructor takes
2888 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2889 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2890 // - Avoid passing negative values which would result in really large stacks.
2891 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2892 size_t sz = size > 0 ? (size_t) size : 0;
2893 native_thread = new JavaThread(&thread_entry, sz);
2894
2895 // At this point it may be possible that no osthread was created for the
2896 // JavaThread due to lack of memory. Check for this situation and throw
2897 // an exception if necessary. Eventually we may want to change this so
2898 // that we only grab the lock if the thread was created successfully -
2899 // then we can also do this check and throw the exception in the
2900 // JavaThread constructor.
2901 if (native_thread->osthread() != nullptr) {
2902 // Note: the current thread is not being used within "prepare".
2903 native_thread->prepare(jthread);
2904 }
2905 }
2906 }
2907
2908 if (throw_illegal_thread_state) {
2909 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2910 }
2911
2912 assert(native_thread != nullptr, "Starting null thread?");
2913
2914 if (native_thread->osthread() == nullptr) {
2915 ResourceMark rm(thread);
2916 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2917 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2918 // No one should hold a reference to the 'native_thread'.
2919 native_thread->smr_delete();
2920 if (JvmtiExport::should_post_resource_exhausted()) {
2921 JvmtiExport::post_resource_exhausted(
2922 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2923 os::native_thread_creation_failed_msg());
2924 }
2925 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2926 os::native_thread_creation_failed_msg());
2927 }
2928
2929 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2930
2931 Thread::start(native_thread);
2932
2933 JVM_END
2934
2935
2936 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2937 ThreadsListHandle tlh(thread);
2938 oop java_thread = nullptr;
2939 JavaThread* receiver = nullptr;
2940 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2941 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2942
2943 if (is_alive) {
2944 // jthread refers to a live JavaThread.
2945 Thread::set_priority(receiver, (ThreadPriority)prio);
2946 }
2947 // Implied else: If the JavaThread hasn't started yet, then the
2948 // priority set in the java.lang.Thread object above will be pushed
2949 // down when it does start.
2950 JVM_END
2951
2952
2953 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2954 HOTSPOT_THREAD_YIELD();
2955 os::naked_yield();
2956 JVM_END
2957
2958 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
2959 if (nanos < 0) {
2960 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
2961 }
2962
2963 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
2964 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2965 }
2966
2967 // Save current thread state and restore it at the end of this block.
2968 // And set new thread state to SLEEPING.
2969 JavaThreadSleepState jtss(thread);
2970
2971 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
2972
2973 if (nanos == 0) {
2974 os::naked_yield();
2975 } else {
2976 ThreadState old_state = thread->osthread()->get_state();
2977 thread->osthread()->set_state(SLEEPING);
2978 if (!thread->sleep_nanos(nanos)) { // interrupted
2979 // An asynchronous exception could have been thrown on
2980 // us while we were sleeping. We do not overwrite those.
2981 if (!HAS_PENDING_EXCEPTION) {
2982 HOTSPOT_THREAD_SLEEP_END(1);
2983
2984 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
2985 // to properly restore the thread state. That's likely wrong.
2986 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2987 }
2988 }
2989 thread->osthread()->set_state(old_state);
2990 }
2991 HOTSPOT_THREAD_SLEEP_END(0);
2992 JVM_END
2993
2994 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
2995 oop jthread = thread->threadObj();
2996 assert(jthread != nullptr, "no current carrier thread!");
2997 return JNIHandles::make_local(THREAD, jthread);
2998 JVM_END
2999
3000 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3001 oop theThread = thread->vthread();
3002 assert(theThread != (oop)nullptr, "no current thread!");
3003 return JNIHandles::make_local(THREAD, theThread);
3004 JVM_END
3005
3006 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3007 jobject theThread))
3008 oop threadObj = JNIHandles::resolve(theThread);
3009 thread->set_vthread(threadObj);
3010
3011 // Set lock id of new current Thread
3012 thread->set_lock_id(java_lang_Thread::thread_id(threadObj));
3013
3014 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3015 JVM_END
3016
3017 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3018 return ThreadIdentifier::unsafe_offset();
3019 JVM_END
3020
3021 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3022 ThreadsListHandle tlh(thread);
3023 JavaThread* receiver = nullptr;
3024 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3025 if (is_alive) {
3026 // jthread refers to a live JavaThread.
3027 receiver->interrupt();
3028 }
3029 JVM_END
3030
3031 // Return true iff the current thread has locked the object passed in
3032
3033 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3034 if (obj == nullptr) {
3035 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3036 }
3037 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3038 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3039 JVM_END
3040
3041 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3042 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3043 return JNIHandles::make_local(THREAD, trace);
3044 JVM_END
3045
3046 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3047 // We don't use a ThreadsListHandle here because the current thread
3048 // must be alive.
3049 oop java_thread = JNIHandles::resolve_non_null(jthread);
3050 JavaThread* thr = java_lang_Thread::thread(java_thread);
3051 if (thread == thr && !thr->has_attached_via_jni()) {
3052 // Thread naming is only supported for the current thread and
3053 // we don't set the name of an attached thread to avoid stepping
3054 // on other programs.
3055 ResourceMark rm(thread);
3056 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3057 os::set_native_thread_name(thread_name);
3058 }
3059 JVM_END
3060
3061 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3062 oop theCache = thread->scopedValueCache();
3063 return JNIHandles::make_local(THREAD, theCache);
3064 JVM_END
3065
3066 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3067 jobject theCache))
3068 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3069 thread->set_scopedValueCache(objs);
3070 JVM_END
3071
3072 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3073
3074 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3075 ResourceMark rm(THREAD);
3076 JvmtiVMObjectAllocEventCollector oam;
3077 vframeStream vfst(thread);
3078
3079 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) {
3080 // This must only be called from SecurityManager.getClassContext
3081 Method* m = vfst.method();
3082 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3083 m->name() == vmSymbols::getClassContext_name() &&
3084 m->signature() == vmSymbols::void_class_array_signature())) {
3085 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3086 }
3087 }
3088
3089 // Collect method holders
3090 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3091 for (; !vfst.at_end(); vfst.security_next()) {
3092 Method* m = vfst.method();
3093 // Native frames are not returned
3094 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3095 Klass* holder = m->method_holder();
3096 assert(holder->is_klass(), "just checking");
3097 klass_array->append(holder);
3098 }
3099 }
3100
3101 // Create result array of type [Ljava/lang/Class;
3102 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3103 // Fill in mirrors corresponding to method holders
3104 for (int i = 0; i < klass_array->length(); i++) {
3105 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3106 }
3107
3108 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3109 JVM_END
3110
3111
3112 // java.lang.Package ////////////////////////////////////////////////////////////////
3113
3114
3115 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3116 ResourceMark rm(THREAD);
3117 JvmtiVMObjectAllocEventCollector oam;
3118 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3119 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3120 return (jstring) JNIHandles::make_local(THREAD, result);
3121 JVM_END
3122
3123
3124 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3125 JvmtiVMObjectAllocEventCollector oam;
3126 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3127 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3128 JVM_END
3129
3130
3131 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3132
3133
3134 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3135 MonitorLocker ml(Heap_lock);
3136 oop ref = Universe::reference_pending_list();
3137 if (ref != nullptr) {
3138 Universe::clear_reference_pending_list();
3139 }
3140 return JNIHandles::make_local(THREAD, ref);
3141 JVM_END
3142
3143 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3144 MonitorLocker ml(Heap_lock);
3145 return Universe::has_reference_pending_list();
3146 JVM_END
3147
3148 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3149 MonitorLocker ml(Heap_lock);
3150 while (!Universe::has_reference_pending_list()) {
3151 ml.wait();
3152 }
3153 JVM_END
3154
3155 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3156 oop ref_oop = JNIHandles::resolve_non_null(ref);
3157 // PhantomReference has it's own implementation of refersTo().
3158 // See: JVM_PhantomReferenceRefersTo
3159 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3160 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3161 return referent == JNIHandles::resolve(o);
3162 JVM_END
3163
3164 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3165 oop ref_oop = JNIHandles::resolve_non_null(ref);
3166 // FinalReference has it's own implementation of clear().
3167 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3168 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3169 // If the referent has already been cleared then done.
3170 // However, if the referent is dead but has not yet been cleared by
3171 // concurrent reference processing, it should NOT be cleared here.
3172 // Instead, clearing should be left to the GC. Clearing it here could
3173 // detectably lose an expected notification, which is impossible with
3174 // STW reference processing. The clearing in enqueue() doesn't have
3175 // this problem, since the enqueue covers the notification, but it's not
3176 // worth the effort to handle that case specially.
3177 return;
3178 }
3179 java_lang_ref_Reference::clear_referent(ref_oop);
3180 JVM_END
3181
3182
3183 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3184
3185
3186 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3187 oop ref_oop = JNIHandles::resolve_non_null(ref);
3188 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3189 return referent == JNIHandles::resolve(o);
3190 JVM_END
3191
3192
3193 // ObjectInputStream ///////////////////////////////////////////////////////////////
3194
3195 // Return the first user-defined class loader up the execution stack, or null
3196 // if only code from the bootstrap or platform class loader is on the stack.
3197
3198 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3199 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3200 InstanceKlass* ik = vfst.method()->method_holder();
3201 oop loader = ik->class_loader();
3202 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3203 return JNIHandles::make_local(THREAD, loader);
3204 }
3205 }
3206 return nullptr;
3207 JVM_END
3208
3209
3210 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3211
3212
3213 // resolve array handle and check arguments
3214 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3215 if (arr == nullptr) {
3216 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3217 }
3218 oop a = JNIHandles::resolve_non_null(arr);
3219 if (!a->is_array()) {
3220 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3221 } else if (type_array_only && !a->is_typeArray()) {
3222 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3223 }
3224 return arrayOop(a);
3225 }
3226
3227
3228 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3229 arrayOop a = check_array(env, arr, false, CHECK_0);
3230 return a->length();
3231 JVM_END
3232
3233
3234 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3235 JvmtiVMObjectAllocEventCollector oam;
3236 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3237 jvalue value;
3238 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3239 oop box = Reflection::box(&value, type, CHECK_NULL);
3240 return JNIHandles::make_local(THREAD, box);
3241 JVM_END
3242
3243
3244 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3245 jvalue value;
3246 value.i = 0; // to initialize value before getting used in CHECK
3247 arrayOop a = check_array(env, arr, true, CHECK_(value));
3248 assert(a->is_typeArray(), "just checking");
3249 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3250 BasicType wide_type = (BasicType) wCode;
3251 if (type != wide_type) {
3252 Reflection::widen(&value, type, wide_type, CHECK_(value));
3253 }
3254 return value;
3255 JVM_END
3256
3257
3258 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3259 arrayOop a = check_array(env, arr, false, CHECK);
3260 oop box = JNIHandles::resolve(val);
3261 jvalue value;
3262 value.i = 0; // to initialize value before getting used in CHECK
3263 BasicType value_type;
3264 if (a->is_objArray()) {
3265 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3266 value_type = Reflection::unbox_for_regular_object(box, &value);
3267 } else {
3268 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3269 }
3270 Reflection::array_set(&value, a, index, value_type, CHECK);
3271 JVM_END
3272
3273
3274 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3275 arrayOop a = check_array(env, arr, true, CHECK);
3276 assert(a->is_typeArray(), "just checking");
3277 BasicType value_type = (BasicType) vCode;
3278 Reflection::array_set(&v, a, index, value_type, CHECK);
3279 JVM_END
3280
3281
3282 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3283 JvmtiVMObjectAllocEventCollector oam;
3284 oop element_mirror = JNIHandles::resolve(eltClass);
3285 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3286 return JNIHandles::make_local(THREAD, result);
3287 JVM_END
3288
3289
3290 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3291 JvmtiVMObjectAllocEventCollector oam;
3292 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3293 oop element_mirror = JNIHandles::resolve(eltClass);
3294 assert(dim_array->is_typeArray(), "just checking");
3295 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3296 return JNIHandles::make_local(THREAD, result);
3297 JVM_END
3298
3299
3300 // Library support ///////////////////////////////////////////////////////////////////////////
3301
3302 JVM_LEAF(void*, JVM_LoadZipLibrary())
3303 return ZipLibrary::handle();
3304 JVM_END
3305
3306 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3307 //%note jvm_ct
3308 char ebuf[1024];
3309 void *load_result;
3310 {
3311 ThreadToNativeFromVM ttnfvm(thread);
3312 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3313 }
3314 if (load_result == nullptr) {
3315 if (throwException) {
3316 char msg[1024];
3317 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3318 // Since 'ebuf' may contain a string encoded using
3319 // platform encoding scheme, we need to pass
3320 // Exceptions::unsafe_to_utf8 to the new_exception method
3321 // as the last argument. See bug 6367357.
3322 Handle h_exception =
3323 Exceptions::new_exception(thread,
3324 vmSymbols::java_lang_UnsatisfiedLinkError(),
3325 msg, Exceptions::unsafe_to_utf8);
3326
3327 THROW_HANDLE_NULL(h_exception);
3328 } else {
3329 log_info(library)("Failed to load library %s", name);
3330 return load_result;
3331 }
3332 }
3333 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3334 return load_result;
3335 JVM_END
3336
3337
3338 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3339 os::dll_unload(handle);
3340 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3341 JVM_END
3342
3343
3344 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3345 void* find_result = os::dll_lookup(handle, name);
3346 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3347 find_result != nullptr ? "Found" : "Failed to find",
3348 name, p2i(handle));
3349 return find_result;
3350 JVM_END
3351
3352
3353 // JNI version ///////////////////////////////////////////////////////////////////////////////
3354
3355 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3356 return Threads::is_supported_jni_version_including_1_1(version);
3357 JVM_END
3358
3359
3360 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3361 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3362 JVM_END
3363
3364 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3365 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3366 JVM_END
3367
3368 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3369 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3370 JVM_END
3371
3372 JVM_ENTRY_NO_ENV(jboolean, JVM_IsStaticallyLinked(void))
3373 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3374 JVM_END
3375
3376 // String support ///////////////////////////////////////////////////////////////////////////
3377
3378 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3379 JvmtiVMObjectAllocEventCollector oam;
3380 if (str == nullptr) return nullptr;
3381 oop string = JNIHandles::resolve_non_null(str);
3382 oop result = StringTable::intern(string, CHECK_NULL);
3383 return (jstring) JNIHandles::make_local(THREAD, result);
3384 JVM_END
3385
3386
3387 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3388
3389 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3390 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3391 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3392 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3393 // nature. JavaThreads will be "in native" when using this API from JDK code.
3394
3395
3396 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3397 VM_Exit::block_if_vm_exited();
3398 return new PlatformMutex();
3399 }
3400
3401
3402 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3403 VM_Exit::block_if_vm_exited();
3404 delete ((PlatformMutex*) mon);
3405 }
3406
3407
3408 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3409 VM_Exit::block_if_vm_exited();
3410 ((PlatformMutex*) mon)->lock();
3411 return 0;
3412 }
3413
3414
3415 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3416 VM_Exit::block_if_vm_exited();
3417 ((PlatformMutex*) mon)->unlock();
3418 }
3419
3420
3421 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3422
3423 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3424 Handle loader, Handle protection_domain,
3425 jboolean throwError, TRAPS) {
3426 // Security Note:
3427 // The Java level wrapper will perform the necessary security check allowing
3428 // us to pass the null as the initiating class loader. The VM is responsible for
3429 // the checkPackageAccess relative to the initiating class loader via the
3430 // protection_domain. The protection_domain is passed as null by the java code
3431 // if there is no security manager in 3-arg Class.forName().
3432 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3433
3434 // Check if we should initialize the class
3435 if (init && klass->is_instance_klass()) {
3436 klass->initialize(CHECK_NULL);
3437 }
3438 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3439 }
3440
3441
3442 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3443
3444 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3445 Handle method_handle;
3446 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3447 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3448 Handle receiver(THREAD, JNIHandles::resolve(obj));
3449 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3450 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3451 jobject res = JNIHandles::make_local(THREAD, result);
3452 if (JvmtiExport::should_post_vm_object_alloc()) {
3453 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3454 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3455 if (java_lang_Class::is_primitive(ret_type)) {
3456 // Only for primitive type vm allocates memory for java object.
3457 // See box() method.
3458 JvmtiExport::post_vm_object_alloc(thread, result);
3459 }
3460 }
3461 return res;
3462 } else {
3463 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3464 }
3465 JVM_END
3466
3467
3468 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3469 oop constructor_mirror = JNIHandles::resolve(c);
3470 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3471 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3472 jobject res = JNIHandles::make_local(THREAD, result);
3473 if (JvmtiExport::should_post_vm_object_alloc()) {
3474 JvmtiExport::post_vm_object_alloc(thread, result);
3475 }
3476 return res;
3477 JVM_END
3478
3479 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3480 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3481 assert(k->is_klass(), "just checking");
3482 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3483 JVM_END
3484
3485 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3486 jclass caller,
3487 jstring interfaceMethodName,
3488 jobject factoryType,
3489 jobject interfaceMethodType,
3490 jobject implementationMember,
3491 jobject dynamicMethodType,
3492 jclass lambdaProxyClass))
3493 #if INCLUDE_CDS
3494 if (!CDSConfig::is_dumping_archive()) {
3495 return;
3496 }
3497
3498 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3499 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3500 if (caller_ik->is_hidden()) {
3501 // Hidden classes not of type lambda proxy classes are currently not being archived.
3502 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3503 // registered for archiving.
3504 return;
3505 }
3506 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3507 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3508 assert(lambda_ik->is_hidden(), "must be a hidden class");
3509 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3510
3511 Symbol* interface_method_name = nullptr;
3512 if (interfaceMethodName != nullptr) {
3513 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3514 }
3515 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3516 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3517
3518 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3519 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3520
3521 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3522 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3523 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3524
3525 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3526 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3527
3528 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3529 interface_method_type, m, dynamic_method_type, THREAD);
3530 #endif // INCLUDE_CDS
3531 JVM_END
3532
3533 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3534 jclass caller,
3535 jstring interfaceMethodName,
3536 jobject factoryType,
3537 jobject interfaceMethodType,
3538 jobject implementationMember,
3539 jobject dynamicMethodType))
3540 #if INCLUDE_CDS
3541
3542 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3543 implementationMember == nullptr || dynamicMethodType == nullptr) {
3544 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3545 }
3546
3547 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3548 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3549 if (!caller_ik->is_shared()) {
3550 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3551 return nullptr;
3552 }
3553
3554 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3555 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3556 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3557
3558 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3559 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3560
3561 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3562 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3563 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3564
3565 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3566 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3567
3568 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3569 interface_method_type, m, dynamic_method_type);
3570 jclass jcls = nullptr;
3571 if (lambda_ik != nullptr) {
3572 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3573 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3574 }
3575 return jcls;
3576 #else
3577 return nullptr;
3578 #endif // INCLUDE_CDS
3579 JVM_END
3580
3581 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3582 if (CDSConfig::is_dumping_static_archive()) {
3583 // We do this so that the default CDS archive can be deterministic.
3584 const char* release = VM_Version::vm_release();
3585 const char* dbg_level = VM_Version::jdk_debug_level();
3586 const char* version = VM_Version::internal_vm_info_string();
3587 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3588 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3589 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3590 seed += (jlong)VM_Version::vm_major_version();
3591 seed += (jlong)VM_Version::vm_minor_version();
3592 seed += (jlong)VM_Version::vm_security_version();
3593 seed += (jlong)VM_Version::vm_patch_version();
3594 if (seed == 0) { // don't let this ever be zero.
3595 seed = 0x87654321;
3596 }
3597 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3598 return seed;
3599 } else {
3600 return 0;
3601 }
3602 JVM_END
3603
3604 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3605 return CDSConfig::get_status();
3606 JVM_END
3607
3608 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3609 #if INCLUDE_CDS
3610 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3611 if (line != nullptr) {
3612 ResourceMark rm(THREAD);
3613 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3614 char* c_line = java_lang_String::as_utf8_string(h_line());
3615 if (CDSConfig::is_dumping_dynamic_archive()) {
3616 // Note: LambdaFormInvokers::append take same format which is not
3617 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3618 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3619 }
3620 if (ClassListWriter::is_enabled()) {
3621 ClassListWriter w;
3622 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3623 }
3624 }
3625 #endif // INCLUDE_CDS
3626 JVM_END
3627
3628 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3629 #if INCLUDE_CDS
3630 ResourceMark rm(THREAD);
3631 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3632 char* file_name = java_lang_String::as_utf8_string(file_handle());
3633 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3634 #endif // INCLUDE_CDS
3635 JVM_END
3636
3637 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3638 #if INCLUDE_CDS
3639 ResourceMark rm(THREAD);
3640 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3641 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3642 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3643 #endif // INCLUDE_CDS
3644 JVM_END
3645
3646 // Returns an array of all live Thread objects (VM internal JavaThreads,
3647 // jvmti agent threads, and JNI attaching threads are skipped)
3648 // See CR 6404306 regarding JNI attaching threads
3649 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3650 ResourceMark rm(THREAD);
3651 ThreadsListEnumerator tle(THREAD, false, false);
3652 JvmtiVMObjectAllocEventCollector oam;
3653
3654 int num_threads = tle.num_threads();
3655 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3656 objArrayHandle threads_ah(THREAD, r);
3657
3658 for (int i = 0; i < num_threads; i++) {
3659 Handle h = tle.get_threadObj(i);
3660 threads_ah->obj_at_put(i, h());
3661 }
3662
3663 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3664 JVM_END
3665
3666
3667 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3668 // Return StackTraceElement[][], each element is the stack trace of a thread in
3669 // the corresponding entry in the given threads array
3670 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3671 JvmtiVMObjectAllocEventCollector oam;
3672
3673 // Check if threads is null
3674 if (threads == nullptr) {
3675 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3676 }
3677
3678 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3679 objArrayHandle ah(THREAD, a);
3680 int num_threads = ah->length();
3681 // check if threads is non-empty array
3682 if (num_threads == 0) {
3683 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3684 }
3685
3686 // check if threads is not an array of objects of Thread class
3687 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3688 if (k != vmClasses::Thread_klass()) {
3689 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3690 }
3691
3692 ResourceMark rm(THREAD);
3693
3694 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3695 for (int i = 0; i < num_threads; i++) {
3696 oop thread_obj = ah->obj_at(i);
3697 instanceHandle h(THREAD, (instanceOop) thread_obj);
3698 thread_handle_array->append(h);
3699 }
3700
3701 // The JavaThread references in thread_handle_array are validated
3702 // in VM_ThreadDump::doit().
3703 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3704 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3705
3706 JVM_END
3707
3708 // JVM monitoring and management support
3709 JVM_LEAF(void*, JVM_GetManagement(jint version))
3710 return Management::get_jmm_interface(version);
3711 JVM_END
3712
3713 // com.sun.tools.attach.VirtualMachine agent properties support
3714 //
3715 // Initialize the agent properties with the properties maintained in the VM
3716 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3717 ResourceMark rm;
3718
3719 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3720
3721 PUTPROP(props, "sun.java.command", Arguments::java_command());
3722 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3723 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3724 return properties;
3725 JVM_END
3726
3727 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3728 {
3729 JvmtiVMObjectAllocEventCollector oam;
3730
3731 if (ofClass == nullptr) {
3732 return nullptr;
3733 }
3734 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3735 // Special handling for primitive objects
3736 if (java_lang_Class::is_primitive(mirror())) {
3737 return nullptr;
3738 }
3739 Klass* k = java_lang_Class::as_Klass(mirror());
3740 if (!k->is_instance_klass()) {
3741 return nullptr;
3742 }
3743 InstanceKlass* ik = InstanceKlass::cast(k);
3744 int encl_method_class_idx = ik->enclosing_method_class_index();
3745 if (encl_method_class_idx == 0) {
3746 return nullptr;
3747 }
3748 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3749 objArrayHandle dest(THREAD, dest_o);
3750 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3751 dest->obj_at_put(0, enc_k->java_mirror());
3752 int encl_method_method_idx = ik->enclosing_method_method_index();
3753 if (encl_method_method_idx != 0) {
3754 Symbol* sym = ik->constants()->symbol_at(
3755 extract_low_short_from_int(
3756 ik->constants()->name_and_type_at(encl_method_method_idx)));
3757 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3758 dest->obj_at_put(1, str());
3759 sym = ik->constants()->symbol_at(
3760 extract_high_short_from_int(
3761 ik->constants()->name_and_type_at(encl_method_method_idx)));
3762 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3763 dest->obj_at_put(2, str());
3764 }
3765 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3766 }
3767 JVM_END
3768
3769 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3770 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3771 ResourceMark rm(THREAD);
3772
3773 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3774 return nullptr;
3775 }
3776
3777 char** vm_flags = Arguments::jvm_flags_array();
3778 char** vm_args = Arguments::jvm_args_array();
3779 int num_flags = Arguments::num_jvm_flags();
3780 int num_args = Arguments::num_jvm_args();
3781
3782 InstanceKlass* ik = vmClasses::String_klass();
3783 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3784 objArrayHandle result_h(THREAD, r);
3785
3786 int index = 0;
3787 for (int j = 0; j < num_flags; j++, index++) {
3788 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3789 result_h->obj_at_put(index, h());
3790 }
3791 for (int i = 0; i < num_args; i++, index++) {
3792 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3793 result_h->obj_at_put(index, h());
3794 }
3795 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3796 JVM_END
3797
3798 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3799 return os::get_signal_number(name);
3800 JVM_END
3801
3802 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3803 #if INCLUDE_JVMTI
3804 if (!DoJVMTIVirtualThreadTransitions) {
3805 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3806 return;
3807 }
3808 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3809 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3810 } else {
3811 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3812 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3813 }
3814 #endif
3815 JVM_END
3816
3817 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3818 #if INCLUDE_JVMTI
3819 if (!DoJVMTIVirtualThreadTransitions) {
3820 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3821 return;
3822 }
3823 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3824 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3825 } else {
3826 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3827 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3828 }
3829 #endif
3830 JVM_END
3831
3832 // If notifications are disabled then just update the VTMS transition bit and return.
3833 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3834 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3835 #if INCLUDE_JVMTI
3836 if (!DoJVMTIVirtualThreadTransitions) {
3837 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3838 return;
3839 }
3840 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3841 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3842 } else {
3843 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3844 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3845 }
3846 #endif
3847 JVM_END
3848
3849 // If notifications are disabled then just update the VTMS transition bit and return.
3850 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3851 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3852 #if INCLUDE_JVMTI
3853 if (!DoJVMTIVirtualThreadTransitions) {
3854 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3855 return;
3856 }
3857 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3858 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3859 } else {
3860 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3861 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3862 }
3863 #endif
3864 JVM_END
3865
3866 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3867 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3868 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3869 #if INCLUDE_JVMTI
3870 if (!DoJVMTIVirtualThreadTransitions) {
3871 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3872 return;
3873 }
3874 assert(thread->is_disable_suspend() != (bool)enter,
3875 "nested or unbalanced monitor enter/exit is not allowed");
3876 thread->toggle_is_disable_suspend();
3877 #endif
3878 JVM_END
3879
3880 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3881 #if INCLUDE_JFR
3882 freeze_result result = THREAD->last_freeze_fail_result();
3883 assert(result != freeze_ok, "sanity check");
3884 EventVirtualThreadPinned event(UNTIMED);
3885 event.set_starttime(THREAD->last_freeze_fail_time());
3886 if (event.should_commit()) {
3887 ResourceMark rm(THREAD);
3888 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3889 THREAD->post_vthread_pinned_event(&event, str, result);
3890 }
3891 #endif
3892 JVM_END
3893
3894 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3895 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3896 assert(parkEvent != nullptr, "not initialized");
3897
3898 OopHandle& list_head = ObjectMonitor::vthread_cxq_head();
3899 oop vthread_head = nullptr;
3900 while (true) {
3901 if (list_head.peek() != nullptr) {
3902 for (;;) {
3903 oop head = list_head.resolve();
3904 if (list_head.cmpxchg(head, nullptr) == head) {
3905 return JNIHandles::make_local(THREAD, head);
3906 }
3907 }
3908 }
3909 ThreadBlockInVM tbivm(THREAD);
3910 parkEvent->park();
3911 }
3912 JVM_END
3913 /*
3914 * Return the current class's class file version. The low order 16 bits of the
3915 * returned jint contain the class's major version. The high order 16 bits
3916 * contain the class's minor version.
3917 */
3918 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3919 oop mirror = JNIHandles::resolve_non_null(current);
3920 if (java_lang_Class::is_primitive(mirror)) {
3921 // return latest major version and minor version of 0.
3922 return JVM_CLASSFILE_MAJOR_VERSION;
3923 }
3924 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
3925
3926 Klass* c = java_lang_Class::as_Klass(mirror);
3927 assert(c->is_instance_klass(), "must be");
3928 InstanceKlass* ik = InstanceKlass::cast(c);
3929 return (ik->minor_version() << 16) | ik->major_version();
3930 JVM_END
3931
3932 /*
3933 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3934 * get the value will see a materialized value and not a scalar-replaced
3935 * null value.
3936 */
3937 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3938 JVM_EnsureMaterializedForStackWalk(env, value);
3939 JVM_END
3940
3941 /*
3942 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3943 */
3944 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3945 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3946 JVM_END