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) || defined(_WIN64)
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_0(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_0(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, (int)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, ClassFileStream::verify);
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_0(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_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
983 }
984 if (is_nestmate) {
985 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
986 }
987 if (!is_strong) {
988 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
989 }
990 if (vm_annotations) {
991 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
992 }
993 if (flags != STRONG_LOADER_LINK) {
994 THROW_MSG_0(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, ClassFileStream::verify);
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();
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_0(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_0(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 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1256 JvmtiVMObjectAllocEventCollector oam;
1257 oop mirror = JNIHandles::resolve_non_null(cls);
1258 if (java_lang_Class::is_primitive(mirror)) {
1259 // There are no signers for primitive types
1260 return nullptr;
1261 }
1262
1263 objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1264
1265 // If there are no signers set in the class, or if the class
1266 // is an array, return null.
1267 if (signers == nullptr) return nullptr;
1268
1269 // copy of the signers array
1270 Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1271 objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1272 for (int index = 0; index < signers->length(); index++) {
1273 signers_copy->obj_at_put(index, signers->obj_at(index));
1274 }
1275
1276 // return the copy
1277 return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1278 JVM_END
1279
1280
1281 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1282 oop mirror = JNIHandles::resolve_non_null(cls);
1283 if (!java_lang_Class::is_primitive(mirror)) {
1284 // This call is ignored for primitive types and arrays.
1285 // Signers are only set once, ClassLoader.java, and thus shouldn't
1286 // be called with an array. Only the bootstrap loader creates arrays.
1287 Klass* k = java_lang_Class::as_Klass(mirror);
1288 if (k->is_instance_klass()) {
1289 java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1290 }
1291 }
1292 JVM_END
1293
1294
1295 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1296 oop mirror = JNIHandles::resolve_non_null(cls);
1297 if (mirror == nullptr) {
1298 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
1299 }
1300
1301 if (java_lang_Class::is_primitive(mirror)) {
1302 // Primitive types does not have a protection domain.
1303 return nullptr;
1304 }
1305
1306 oop pd = java_lang_Class::protection_domain(mirror);
1307 return (jobject) JNIHandles::make_local(THREAD, pd);
1308 JVM_END
1309
1310
1311 // Returns the inherited_access_control_context field of the running thread.
1312 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1313 oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1314 return JNIHandles::make_local(THREAD, result);
1315 JVM_END
1316
1317 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1318 if (!UsePrivilegedStack) return nullptr;
1319
1320 ResourceMark rm(THREAD);
1321 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1322 JvmtiVMObjectAllocEventCollector oam;
1323
1324 // count the protection domains on the execution stack. We collapse
1325 // duplicate consecutive protection domains into a single one, as
1326 // well as stopping when we hit a privileged frame.
1327
1328 oop previous_protection_domain = nullptr;
1329 Handle privileged_context(thread, nullptr);
1330 bool is_privileged = false;
1331 oop protection_domain = nullptr;
1332
1333 // Iterate through Java frames
1334 vframeStream vfst(thread);
1335 for(; !vfst.at_end(); vfst.next()) {
1336 // get method of frame
1337 Method* method = vfst.method();
1338
1339 // stop at the first privileged frame
1340 if (method->method_holder() == vmClasses::AccessController_klass() &&
1341 method->name() == vmSymbols::executePrivileged_name())
1342 {
1343 // this frame is privileged
1344 is_privileged = true;
1345
1346 javaVFrame *priv = vfst.asJavaVFrame(); // executePrivileged
1347
1348 StackValueCollection* locals = priv->locals();
1349 StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1350 StackValue* clr_sv = locals->at(2); // Class<?> caller
1351 assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1352 assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1353 privileged_context = ctx_sv->get_obj();
1354 Handle caller = clr_sv->get_obj();
1355
1356 Klass *caller_klass = java_lang_Class::as_Klass(caller());
1357 protection_domain = caller_klass->protection_domain();
1358 } else {
1359 protection_domain = method->method_holder()->protection_domain();
1360 }
1361
1362 if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) {
1363 local_array->push(Handle(thread, protection_domain));
1364 previous_protection_domain = protection_domain;
1365 }
1366
1367 if (is_privileged) break;
1368 }
1369
1370
1371 // either all the domains on the stack were system domains, or
1372 // we had a privileged system domain
1373 if (local_array->is_empty()) {
1374 if (is_privileged && privileged_context.is_null()) return nullptr;
1375
1376 oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1377 return JNIHandles::make_local(THREAD, result);
1378 }
1379
1380 objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1381 local_array->length(), CHECK_NULL);
1382 objArrayHandle h_context(thread, context);
1383 for (int index = 0; index < local_array->length(); index++) {
1384 h_context->obj_at_put(index, local_array->at(index)());
1385 }
1386
1387 oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1388
1389 return JNIHandles::make_local(THREAD, result);
1390 JVM_END
1391
1392 class ScopedValueBindingsResolver {
1393 public:
1394 InstanceKlass* Carrier_klass;
1395 ScopedValueBindingsResolver(JavaThread* THREAD) {
1396 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1397 Carrier_klass = InstanceKlass::cast(k);
1398 }
1399 };
1400
1401 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1402 ResourceMark rm(THREAD);
1403 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1404 JvmtiVMObjectAllocEventCollector oam;
1405
1406 static ScopedValueBindingsResolver resolver(THREAD);
1407
1408 // Iterate through Java frames
1409 vframeStream vfst(thread);
1410 for(; !vfst.at_end(); vfst.next()) {
1411 int loc = -1;
1412 // get method of frame
1413 Method* method = vfst.method();
1414
1415 Symbol *name = method->name();
1416
1417 InstanceKlass* holder = method->method_holder();
1418 if (name == vmSymbols::runWith_method_name()) {
1419 if (holder == vmClasses::Thread_klass()
1420 || holder == resolver.Carrier_klass) {
1421 loc = 1;
1422 }
1423 }
1424
1425 if (loc != -1) {
1426 javaVFrame *frame = vfst.asJavaVFrame();
1427 StackValueCollection* locals = frame->locals();
1428 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1429 Handle result = head_sv->get_obj();
1430 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1431 if (result() != nullptr) {
1432 return JNIHandles::make_local(THREAD, result());
1433 }
1434 }
1435 }
1436
1437 return nullptr;
1438 JVM_END
1439
1440 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1441 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1442 return (k != nullptr) && k->is_array_klass() ? true : false;
1443 JVM_END
1444
1445
1446 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1447 oop mirror = JNIHandles::resolve_non_null(cls);
1448 return (jboolean) java_lang_Class::is_primitive(mirror);
1449 JVM_END
1450
1451
1452 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1453 oop mirror = JNIHandles::resolve_non_null(cls);
1454 if (java_lang_Class::is_primitive(mirror)) {
1455 // Primitive type
1456 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1457 }
1458
1459 Klass* k = java_lang_Class::as_Klass(mirror);
1460 debug_only(int computed_modifiers = k->compute_modifier_flags());
1461 assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1462 return k->modifier_flags();
1463 JVM_END
1464
1465
1466 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1467
1468 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1469 JvmtiVMObjectAllocEventCollector oam;
1470 // ofClass is a reference to a java_lang_Class object. The mirror object
1471 // of an InstanceKlass
1472 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1473 if (java_lang_Class::is_primitive(ofMirror) ||
1474 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1475 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1476 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1477 }
1478
1479 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1480 InnerClassesIterator iter(k);
1481
1482 if (iter.length() == 0) {
1483 // Neither an inner nor outer class
1484 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1485 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1486 }
1487
1488 // find inner class info
1489 constantPoolHandle cp(thread, k->constants());
1490 int length = iter.length();
1491
1492 // Allocate temp. result array
1493 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1494 objArrayHandle result (THREAD, r);
1495 int members = 0;
1496
1497 for (; !iter.done(); iter.next()) {
1498 int ioff = iter.inner_class_info_index();
1499 int ooff = iter.outer_class_info_index();
1500
1501 if (ioff != 0 && ooff != 0) {
1502 // Check to see if the name matches the class we're looking for
1503 // before attempting to find the class.
1504 if (cp->klass_name_at_matches(k, ooff)) {
1505 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1506 if (outer_klass == k) {
1507 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1508 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1509
1510 // Throws an exception if outer klass has not declared k as
1511 // an inner klass
1512 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1513
1514 result->obj_at_put(members, inner_klass->java_mirror());
1515 members++;
1516 }
1517 }
1518 }
1519 }
1520
1521 if (members != length) {
1522 // Return array of right length
1523 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1524 for(int i = 0; i < members; i++) {
1525 res->obj_at_put(i, result->obj_at(i));
1526 }
1527 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1528 }
1529
1530 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1531 JVM_END
1532
1533
1534 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1535 {
1536 // ofClass is a reference to a java_lang_Class object.
1537 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1538 if (java_lang_Class::is_primitive(ofMirror)) {
1539 return nullptr;
1540 }
1541 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1542 if (!klass->is_instance_klass()) {
1543 return nullptr;
1544 }
1545
1546 bool inner_is_member = false;
1547 Klass* outer_klass
1548 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1549 if (outer_klass == nullptr) return nullptr; // already a top-level class
1550 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1551 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1552 }
1553 JVM_END
1554
1555 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1556 {
1557 oop mirror = JNIHandles::resolve_non_null(cls);
1558 if (java_lang_Class::is_primitive(mirror)) {
1559 return nullptr;
1560 }
1561 Klass* klass = java_lang_Class::as_Klass(mirror);
1562 if (!klass->is_instance_klass()) {
1563 return nullptr;
1564 }
1565 InstanceKlass* k = InstanceKlass::cast(klass);
1566 int ooff = 0, noff = 0;
1567 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1568 if (noff != 0) {
1569 constantPoolHandle i_cp(thread, k->constants());
1570 Symbol* name = i_cp->symbol_at(noff);
1571 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1572 return (jstring) JNIHandles::make_local(THREAD, str());
1573 }
1574 }
1575 return nullptr;
1576 }
1577 JVM_END
1578
1579 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1580 assert (cls != nullptr, "illegal class");
1581 JvmtiVMObjectAllocEventCollector oam;
1582 ResourceMark rm(THREAD);
1583 oop mirror = JNIHandles::resolve_non_null(cls);
1584 // Return null for arrays and primitives
1585 if (!java_lang_Class::is_primitive(mirror)) {
1586 Klass* k = java_lang_Class::as_Klass(mirror);
1587 if (k->is_instance_klass()) {
1588 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1589 if (sym == nullptr) return nullptr;
1590 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1591 return (jstring) JNIHandles::make_local(THREAD, str());
1592 }
1593 }
1594 return nullptr;
1595 JVM_END
1596
1597
1598 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1599 assert (cls != nullptr, "illegal class");
1600 oop mirror = JNIHandles::resolve_non_null(cls);
1601 // Return null for arrays and primitives
1602 if (!java_lang_Class::is_primitive(mirror)) {
1603 Klass* k = java_lang_Class::as_Klass(mirror);
1604 if (k->is_instance_klass()) {
1605 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1606 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1607 }
1608 }
1609 return nullptr;
1610 JVM_END
1611
1612
1613 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1614 // some of this code was adapted from from jni_FromReflectedField
1615
1616 oop reflected = JNIHandles::resolve_non_null(field);
1617 oop mirror = java_lang_reflect_Field::clazz(reflected);
1618 Klass* k = java_lang_Class::as_Klass(mirror);
1619 int slot = java_lang_reflect_Field::slot(reflected);
1620 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1621
1622 InstanceKlass* ik = InstanceKlass::cast(k);
1623 int offset = ik->field_offset(slot);
1624
1625 if (modifiers & JVM_ACC_STATIC) {
1626 // for static fields we only look in the current class
1627 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1628 assert(false, "cannot find static field");
1629 return false;
1630 }
1631 } else {
1632 // for instance fields we start with the current class and work
1633 // our way up through the superclass chain
1634 if (!ik->find_field_from_offset(offset, false, &fd)) {
1635 assert(false, "cannot find instance field");
1636 return false;
1637 }
1638 }
1639 return true;
1640 }
1641
1642 static Method* jvm_get_method_common(jobject method) {
1643 // some of this code was adapted from from jni_FromReflectedMethod
1644
1645 oop reflected = JNIHandles::resolve_non_null(method);
1646 oop mirror = nullptr;
1647 int slot = 0;
1648
1649 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1650 mirror = java_lang_reflect_Constructor::clazz(reflected);
1651 slot = java_lang_reflect_Constructor::slot(reflected);
1652 } else {
1653 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1654 "wrong type");
1655 mirror = java_lang_reflect_Method::clazz(reflected);
1656 slot = java_lang_reflect_Method::slot(reflected);
1657 }
1658 Klass* k = java_lang_Class::as_Klass(mirror);
1659
1660 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1661 assert(m != nullptr, "cannot find method");
1662 return m; // caller has to deal with null in product mode
1663 }
1664
1665 /* Type use annotations support (JDK 1.8) */
1666
1667 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1668 assert (cls != nullptr, "illegal class");
1669 ResourceMark rm(THREAD);
1670 // Return null for arrays and primitives
1671 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1672 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1673 if (k->is_instance_klass()) {
1674 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1675 if (type_annotations != nullptr) {
1676 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1677 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1678 }
1679 }
1680 }
1681 return nullptr;
1682 JVM_END
1683
1684 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1685 assert (method != nullptr, "illegal method");
1686 // method is a handle to a java.lang.reflect.Method object
1687 Method* m = jvm_get_method_common(method);
1688 if (m == nullptr) {
1689 return nullptr;
1690 }
1691
1692 AnnotationArray* type_annotations = m->type_annotations();
1693 if (type_annotations != nullptr) {
1694 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1695 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1696 }
1697
1698 return nullptr;
1699 JVM_END
1700
1701 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1702 assert (field != nullptr, "illegal field");
1703 fieldDescriptor fd;
1704 bool gotFd = jvm_get_field_common(field, fd);
1705 if (!gotFd) {
1706 return nullptr;
1707 }
1708
1709 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1710 JVM_END
1711
1712 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1713 if (!cp->is_within_bounds(index)) {
1714 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1715 }
1716 }
1717
1718 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1719 {
1720 // method is a handle to a java.lang.reflect.Method object
1721 Method* method_ptr = jvm_get_method_common(method);
1722 methodHandle mh (THREAD, method_ptr);
1723 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1724 const int num_params = mh->method_parameters_length();
1725
1726 if (num_params < 0) {
1727 // A -1 return value from method_parameters_length means there is no
1728 // parameter data. Return null to indicate this to the reflection
1729 // API.
1730 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1731 return (jobjectArray)nullptr;
1732 } else {
1733 // Otherwise, we return something up to reflection, even if it is
1734 // a zero-length array. Why? Because in some cases this can
1735 // trigger a MalformedParametersException.
1736
1737 // make sure all the symbols are properly formatted
1738 for (int i = 0; i < num_params; i++) {
1739 MethodParametersElement* params = mh->method_parameters_start();
1740 int index = params[i].name_cp_index;
1741 constantPoolHandle cp(THREAD, mh->constants());
1742 bounds_check(cp, index, CHECK_NULL);
1743
1744 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1745 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1746 "Wrong type at constant pool index");
1747 }
1748
1749 }
1750
1751 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1752 objArrayHandle result (THREAD, result_oop);
1753
1754 for (int i = 0; i < num_params; i++) {
1755 MethodParametersElement* params = mh->method_parameters_start();
1756 // For a 0 index, give a null symbol
1757 Symbol* sym = 0 != params[i].name_cp_index ?
1758 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1759 int flags = params[i].flags;
1760 oop param = Reflection::new_parameter(reflected_method, i, sym,
1761 flags, CHECK_NULL);
1762 result->obj_at_put(i, param);
1763 }
1764 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1765 }
1766 }
1767 JVM_END
1768
1769 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1770
1771 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1772 {
1773 JvmtiVMObjectAllocEventCollector oam;
1774
1775 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1776 // Exclude primitive types and array types
1777 if (java_lang_Class::is_primitive(ofMirror) ||
1778 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1779 // Return empty array
1780 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1781 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1782 }
1783
1784 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1785 constantPoolHandle cp(THREAD, k->constants());
1786
1787 // Ensure class is linked
1788 k->link_class(CHECK_NULL);
1789
1790 // Allocate result
1791 int num_fields;
1792
1793 if (publicOnly) {
1794 num_fields = 0;
1795 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1796 if (fs.access_flags().is_public()) ++num_fields;
1797 }
1798 } else {
1799 num_fields = k->java_fields_count();
1800 }
1801
1802 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1803 objArrayHandle result (THREAD, r);
1804
1805 int out_idx = 0;
1806 fieldDescriptor fd;
1807 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1808 if (!publicOnly || fs.access_flags().is_public()) {
1809 fd.reinitialize(k, fs.index());
1810 oop field = Reflection::new_field(&fd, CHECK_NULL);
1811 result->obj_at_put(out_idx, field);
1812 ++out_idx;
1813 }
1814 }
1815 assert(out_idx == num_fields, "just checking");
1816 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1817 }
1818 JVM_END
1819
1820 // A class is a record if and only if it is final and a direct subclass of
1821 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1822 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1823 {
1824 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1825 if (k != nullptr && k->is_instance_klass()) {
1826 InstanceKlass* ik = InstanceKlass::cast(k);
1827 return ik->is_record();
1828 } else {
1829 return false;
1830 }
1831 }
1832 JVM_END
1833
1834 // Returns an array containing the components of the Record attribute,
1835 // or null if the attribute is not present.
1836 //
1837 // Note that this function returns the components of the Record attribute
1838 // even if the class is not a record.
1839 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1840 {
1841 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1842 assert(c->is_instance_klass(), "must be");
1843 InstanceKlass* ik = InstanceKlass::cast(c);
1844
1845 Array<RecordComponent*>* components = ik->record_components();
1846 if (components != nullptr) {
1847 JvmtiVMObjectAllocEventCollector oam;
1848 constantPoolHandle cp(THREAD, ik->constants());
1849 int length = components->length();
1850 assert(length >= 0, "unexpected record_components length");
1851 objArrayOop record_components =
1852 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1853 objArrayHandle components_h (THREAD, record_components);
1854
1855 for (int x = 0; x < length; x++) {
1856 RecordComponent* component = components->at(x);
1857 assert(component != nullptr, "unexpected null record component");
1858 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1859 components_h->obj_at_put(x, component_oop);
1860 }
1861 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1862 }
1863
1864 return nullptr;
1865 }
1866 JVM_END
1867
1868 static bool select_method(const methodHandle& method, bool want_constructor) {
1869 if (want_constructor) {
1870 return (method->is_initializer() && !method->is_static());
1871 } else {
1872 return (!method->is_initializer() && !method->is_overpass());
1873 }
1874 }
1875
1876 static jobjectArray get_class_declared_methods_helper(
1877 JNIEnv *env,
1878 jclass ofClass, jboolean publicOnly,
1879 bool want_constructor,
1880 Klass* klass, TRAPS) {
1881
1882 JvmtiVMObjectAllocEventCollector oam;
1883
1884 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1885 // Exclude primitive types and array types
1886 if (java_lang_Class::is_primitive(ofMirror)
1887 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1888 // Return empty array
1889 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1890 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1891 }
1892
1893 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1894
1895 // Ensure class is linked
1896 k->link_class(CHECK_NULL);
1897
1898 Array<Method*>* methods = k->methods();
1899 int methods_length = methods->length();
1900
1901 // Save original method_idnum in case of redefinition, which can change
1902 // the idnum of obsolete methods. The new method will have the same idnum
1903 // but if we refresh the methods array, the counts will be wrong.
1904 ResourceMark rm(THREAD);
1905 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1906 int num_methods = 0;
1907
1908 for (int i = 0; i < methods_length; i++) {
1909 methodHandle method(THREAD, methods->at(i));
1910 if (select_method(method, want_constructor)) {
1911 if (!publicOnly || method->is_public()) {
1912 idnums->push(method->method_idnum());
1913 ++num_methods;
1914 }
1915 }
1916 }
1917
1918 // Allocate result
1919 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1920 objArrayHandle result (THREAD, r);
1921
1922 // Now just put the methods that we selected above, but go by their idnum
1923 // in case of redefinition. The methods can be redefined at any safepoint,
1924 // so above when allocating the oop array and below when creating reflect
1925 // objects.
1926 for (int i = 0; i < num_methods; i++) {
1927 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1928 if (method.is_null()) {
1929 // Method may have been deleted and seems this API can handle null
1930 // Otherwise should probably put a method that throws NSME
1931 result->obj_at_put(i, nullptr);
1932 } else {
1933 oop m;
1934 if (want_constructor) {
1935 m = Reflection::new_constructor(method, CHECK_NULL);
1936 } else {
1937 m = Reflection::new_method(method, false, CHECK_NULL);
1938 }
1939 result->obj_at_put(i, m);
1940 }
1941 }
1942
1943 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1944 }
1945
1946 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1947 {
1948 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1949 /*want_constructor*/ false,
1950 vmClasses::reflect_Method_klass(), THREAD);
1951 }
1952 JVM_END
1953
1954 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1955 {
1956 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1957 /*want_constructor*/ true,
1958 vmClasses::reflect_Constructor_klass(), THREAD);
1959 }
1960 JVM_END
1961
1962 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1963 {
1964 oop mirror = JNIHandles::resolve_non_null(cls);
1965 if (java_lang_Class::is_primitive(mirror)) {
1966 // Primitive type
1967 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1968 }
1969
1970 Klass* k = java_lang_Class::as_Klass(mirror);
1971 return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1972 }
1973 JVM_END
1974
1975 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1976 {
1977 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1978 assert(c->is_instance_klass(), "must be");
1979 InstanceKlass* ck = InstanceKlass::cast(c);
1980 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1981 assert(m->is_instance_klass(), "must be");
1982 InstanceKlass* mk = InstanceKlass::cast(m);
1983 return ck->has_nestmate_access_to(mk, THREAD);
1984 }
1985 JVM_END
1986
1987 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1988 {
1989 // current is not a primitive or array class
1990 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1991 assert(c->is_instance_klass(), "must be");
1992 InstanceKlass* ck = InstanceKlass::cast(c);
1993 InstanceKlass* host = ck->nest_host(THREAD);
1994 return (jclass) (host == nullptr ? nullptr :
1995 JNIHandles::make_local(THREAD, host->java_mirror()));
1996 }
1997 JVM_END
1998
1999 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
2000 {
2001 // current is not a primitive or array class
2002 ResourceMark rm(THREAD);
2003 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
2004 assert(c->is_instance_klass(), "must be");
2005 InstanceKlass* ck = InstanceKlass::cast(c);
2006 InstanceKlass* host = ck->nest_host(THREAD);
2007
2008 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2009 ck->external_name(), host->external_name());
2010 {
2011 JvmtiVMObjectAllocEventCollector oam;
2012 Array<u2>* members = host->nest_members();
2013 int length = members == nullptr ? 0 : members->length();
2014
2015 log_trace(class, nestmates)(" - host has %d listed nest members", length);
2016
2017 // nest host is first in the array so make it one bigger
2018 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2019 length + 1, CHECK_NULL);
2020 objArrayHandle result(THREAD, r);
2021 result->obj_at_put(0, host->java_mirror());
2022 if (length != 0) {
2023 int count = 0;
2024 for (int i = 0; i < length; i++) {
2025 int cp_index = members->at(i);
2026 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2027 if (HAS_PENDING_EXCEPTION) {
2028 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2029 return nullptr; // propagate VMEs
2030 }
2031 if (log_is_enabled(Trace, class, nestmates)) {
2032 stringStream ss;
2033 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2034 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2035 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2036 log_trace(class, nestmates)("%s", ss.as_string());
2037 }
2038 CLEAR_PENDING_EXCEPTION;
2039 continue;
2040 }
2041 if (k->is_instance_klass()) {
2042 InstanceKlass* ik = InstanceKlass::cast(k);
2043 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2044 if (nest_host_k == host) {
2045 result->obj_at_put(count+1, k->java_mirror());
2046 count++;
2047 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2048 } else {
2049 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2050 ik->external_name(), nest_host_k->external_name());
2051 }
2052 } else {
2053 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2054 k->external_name());
2055 }
2056 }
2057 if (count < length) {
2058 // we had invalid entries so we need to compact the array
2059 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2060 length + 1, count + 1);
2061
2062 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2063 count + 1, CHECK_NULL);
2064 objArrayHandle result2(THREAD, r2);
2065 for (int i = 0; i < count + 1; i++) {
2066 result2->obj_at_put(i, result->obj_at(i));
2067 }
2068 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2069 }
2070 }
2071 else {
2072 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2073 }
2074 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2075 }
2076 }
2077 JVM_END
2078
2079 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2080 {
2081 oop mirror = JNIHandles::resolve_non_null(current);
2082 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2083 Klass* c = java_lang_Class::as_Klass(mirror);
2084 assert(c->is_instance_klass(), "must be");
2085 InstanceKlass* ik = InstanceKlass::cast(c);
2086 ResourceMark rm(THREAD);
2087 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2088 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2089 if (ik->is_sealed()) {
2090 JvmtiVMObjectAllocEventCollector oam;
2091 Array<u2>* subclasses = ik->permitted_subclasses();
2092 int length = subclasses->length();
2093
2094 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2095
2096 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2097 length, CHECK_NULL);
2098 objArrayHandle result(THREAD, r);
2099 int count = 0;
2100 for (int i = 0; i < length; i++) {
2101 int cp_index = subclasses->at(i);
2102 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2103 if (HAS_PENDING_EXCEPTION) {
2104 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2105 return nullptr; // propagate VMEs
2106 }
2107 if (log_is_enabled(Trace, class, sealed)) {
2108 stringStream ss;
2109 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2110 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2111 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2112 log_trace(class, sealed)("%s", ss.as_string());
2113 }
2114
2115 CLEAR_PENDING_EXCEPTION;
2116 continue;
2117 }
2118 if (k->is_instance_klass()) {
2119 result->obj_at_put(count++, k->java_mirror());
2120 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2121 }
2122 }
2123 if (count < length) {
2124 // we had invalid entries so we need to compact the array
2125 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2126 count, CHECK_NULL);
2127 objArrayHandle result2(THREAD, r2);
2128 for (int i = 0; i < count; i++) {
2129 result2->obj_at_put(i, result->obj_at(i));
2130 }
2131 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2132 }
2133 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2134 } else {
2135 return nullptr;
2136 }
2137 }
2138 JVM_END
2139
2140 // Constant pool access //////////////////////////////////////////////////////////
2141
2142 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2143 {
2144 JvmtiVMObjectAllocEventCollector oam;
2145 oop mirror = JNIHandles::resolve_non_null(cls);
2146 // Return null for primitives and arrays
2147 if (!java_lang_Class::is_primitive(mirror)) {
2148 Klass* k = java_lang_Class::as_Klass(mirror);
2149 if (k->is_instance_klass()) {
2150 InstanceKlass* k_h = InstanceKlass::cast(k);
2151 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2152 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2153 return JNIHandles::make_local(THREAD, jcp());
2154 }
2155 }
2156 return nullptr;
2157 }
2158 JVM_END
2159
2160
2161 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2162 {
2163 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2164 return cp->length();
2165 }
2166 JVM_END
2167
2168
2169 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2170 {
2171 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2172 bounds_check(cp, index, CHECK_NULL);
2173 constantTag tag = cp->tag_at(index);
2174 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2175 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2176 }
2177 Klass* k = cp->klass_at(index, CHECK_NULL);
2178 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2179 }
2180 JVM_END
2181
2182 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2183 {
2184 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2185 bounds_check(cp, index, CHECK_NULL);
2186 constantTag tag = cp->tag_at(index);
2187 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2188 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2189 }
2190 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2191 if (k == nullptr) return nullptr;
2192 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2193 }
2194 JVM_END
2195
2196 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2197 constantTag tag = cp->tag_at(index);
2198 if (!tag.is_method() && !tag.is_interface_method()) {
2199 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2200 }
2201 int klass_ref = cp->uncached_klass_ref_index_at(index);
2202 Klass* k_o;
2203 if (force_resolution) {
2204 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2205 } else {
2206 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2207 if (k_o == nullptr) return nullptr;
2208 }
2209 InstanceKlass* k = InstanceKlass::cast(k_o);
2210 Symbol* name = cp->uncached_name_ref_at(index);
2211 Symbol* sig = cp->uncached_signature_ref_at(index);
2212 methodHandle m (THREAD, k->find_method(name, sig));
2213 if (m.is_null()) {
2214 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2215 }
2216 oop method;
2217 if (!m->is_initializer() || m->is_static()) {
2218 method = Reflection::new_method(m, true, CHECK_NULL);
2219 } else {
2220 method = Reflection::new_constructor(m, CHECK_NULL);
2221 }
2222 return JNIHandles::make_local(THREAD, method);
2223 }
2224
2225 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2226 {
2227 JvmtiVMObjectAllocEventCollector oam;
2228 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2229 bounds_check(cp, index, CHECK_NULL);
2230 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2231 return res;
2232 }
2233 JVM_END
2234
2235 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2236 {
2237 JvmtiVMObjectAllocEventCollector oam;
2238 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2239 bounds_check(cp, index, CHECK_NULL);
2240 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2241 return res;
2242 }
2243 JVM_END
2244
2245 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2246 constantTag tag = cp->tag_at(index);
2247 if (!tag.is_field()) {
2248 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2249 }
2250 int klass_ref = cp->uncached_klass_ref_index_at(index);
2251 Klass* k_o;
2252 if (force_resolution) {
2253 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2254 } else {
2255 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2256 if (k_o == nullptr) return nullptr;
2257 }
2258 InstanceKlass* k = InstanceKlass::cast(k_o);
2259 Symbol* name = cp->uncached_name_ref_at(index);
2260 Symbol* sig = cp->uncached_signature_ref_at(index);
2261 fieldDescriptor fd;
2262 Klass* target_klass = k->find_field(name, sig, &fd);
2263 if (target_klass == nullptr) {
2264 THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2265 }
2266 oop field = Reflection::new_field(&fd, CHECK_NULL);
2267 return JNIHandles::make_local(THREAD, field);
2268 }
2269
2270 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2271 {
2272 JvmtiVMObjectAllocEventCollector oam;
2273 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2274 bounds_check(cp, index, CHECK_NULL);
2275 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2276 return res;
2277 }
2278 JVM_END
2279
2280 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2281 {
2282 JvmtiVMObjectAllocEventCollector oam;
2283 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2284 bounds_check(cp, index, CHECK_NULL);
2285 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2286 return res;
2287 }
2288 JVM_END
2289
2290 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2291 {
2292 JvmtiVMObjectAllocEventCollector oam;
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_field_or_method()) {
2297 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2298 }
2299 int klass_ref = cp->uncached_klass_ref_index_at(index);
2300 Symbol* klass_name = cp->klass_name_at(klass_ref);
2301 Symbol* member_name = cp->uncached_name_ref_at(index);
2302 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2303 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2304 objArrayHandle dest(THREAD, dest_o);
2305 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2306 dest->obj_at_put(0, str());
2307 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2308 dest->obj_at_put(1, str());
2309 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2310 dest->obj_at_put(2, str());
2311 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2312 }
2313 JVM_END
2314
2315 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2316 {
2317 JvmtiVMObjectAllocEventCollector oam;
2318 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2319 bounds_check(cp, index, CHECK_0);
2320 constantTag tag = cp->tag_at(index);
2321 if (!tag.is_field_or_method()) {
2322 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2323 }
2324 return (jint) cp->uncached_klass_ref_index_at(index);
2325 }
2326 JVM_END
2327
2328 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2329 {
2330 JvmtiVMObjectAllocEventCollector oam;
2331 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2332 bounds_check(cp, index, CHECK_0);
2333 constantTag tag = cp->tag_at(index);
2334 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2335 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2336 }
2337 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2338 }
2339 JVM_END
2340
2341 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2342 {
2343 JvmtiVMObjectAllocEventCollector oam;
2344 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2345 bounds_check(cp, index, CHECK_NULL);
2346 constantTag tag = cp->tag_at(index);
2347 if (!tag.is_name_and_type()) {
2348 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2349 }
2350 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2351 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2352 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2353 objArrayHandle dest(THREAD, dest_o);
2354 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2355 dest->obj_at_put(0, str());
2356 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2357 dest->obj_at_put(1, str());
2358 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2359 }
2360 JVM_END
2361
2362 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2363 {
2364 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2365 bounds_check(cp, index, CHECK_0);
2366 constantTag tag = cp->tag_at(index);
2367 if (!tag.is_int()) {
2368 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2369 }
2370 return cp->int_at(index);
2371 }
2372 JVM_END
2373
2374 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2375 {
2376 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2377 bounds_check(cp, index, CHECK_(0L));
2378 constantTag tag = cp->tag_at(index);
2379 if (!tag.is_long()) {
2380 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2381 }
2382 return cp->long_at(index);
2383 }
2384 JVM_END
2385
2386 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2387 {
2388 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2389 bounds_check(cp, index, CHECK_(0.0f));
2390 constantTag tag = cp->tag_at(index);
2391 if (!tag.is_float()) {
2392 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2393 }
2394 return cp->float_at(index);
2395 }
2396 JVM_END
2397
2398 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2399 {
2400 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2401 bounds_check(cp, index, CHECK_(0.0));
2402 constantTag tag = cp->tag_at(index);
2403 if (!tag.is_double()) {
2404 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2405 }
2406 return cp->double_at(index);
2407 }
2408 JVM_END
2409
2410 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2411 {
2412 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2413 bounds_check(cp, index, CHECK_NULL);
2414 constantTag tag = cp->tag_at(index);
2415 if (!tag.is_string()) {
2416 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2417 }
2418 oop str = cp->string_at(index, CHECK_NULL);
2419 return (jstring) JNIHandles::make_local(THREAD, str);
2420 }
2421 JVM_END
2422
2423 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2424 {
2425 JvmtiVMObjectAllocEventCollector oam;
2426 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2427 bounds_check(cp, index, CHECK_NULL);
2428 constantTag tag = cp->tag_at(index);
2429 if (!tag.is_symbol()) {
2430 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2431 }
2432 Symbol* sym = cp->symbol_at(index);
2433 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2434 return (jstring) JNIHandles::make_local(THREAD, str());
2435 }
2436 JVM_END
2437
2438 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2439 {
2440 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2441 bounds_check(cp, index, CHECK_0);
2442 constantTag tag = cp->tag_at(index);
2443 jbyte result = tag.value();
2444 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2445 // they are changed to the corresponding tags from the JVM spec, so that java code in
2446 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2447 if (tag.is_klass_or_reference()) {
2448 result = JVM_CONSTANT_Class;
2449 } else if (tag.is_string_index()) {
2450 result = JVM_CONSTANT_String;
2451 } else if (tag.is_method_type_in_error()) {
2452 result = JVM_CONSTANT_MethodType;
2453 } else if (tag.is_method_handle_in_error()) {
2454 result = JVM_CONSTANT_MethodHandle;
2455 } else if (tag.is_dynamic_constant_in_error()) {
2456 result = JVM_CONSTANT_Dynamic;
2457 }
2458 return result;
2459 }
2460 JVM_END
2461
2462 // Assertion support. //////////////////////////////////////////////////////////
2463
2464 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2465 assert(cls != nullptr, "bad class");
2466
2467 oop r = JNIHandles::resolve(cls);
2468 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2469 if (java_lang_Class::is_primitive(r)) return false;
2470
2471 Klass* k = java_lang_Class::as_Klass(r);
2472 assert(k->is_instance_klass(), "must be an instance klass");
2473 if (!k->is_instance_klass()) return false;
2474
2475 ResourceMark rm(THREAD);
2476 const char* name = k->name()->as_C_string();
2477 bool system_class = k->class_loader() == nullptr;
2478 return JavaAssertions::enabled(name, system_class);
2479
2480 JVM_END
2481
2482
2483 // Return a new AssertionStatusDirectives object with the fields filled in with
2484 // command-line assertion arguments (i.e., -ea, -da).
2485 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2486 JvmtiVMObjectAllocEventCollector oam;
2487 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2488 return JNIHandles::make_local(THREAD, asd);
2489 JVM_END
2490
2491 // Verification ////////////////////////////////////////////////////////////////////////////////
2492
2493 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2494
2495 // RedefineClasses support: bug 6214132 caused verification to fail.
2496 // All functions from this section should call the jvmtiThreadSate function:
2497 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2498 // The function returns a Klass* of the _scratch_class if the verifier
2499 // was invoked in the middle of the class redefinition.
2500 // Otherwise it returns its argument value which is the _the_class Klass*.
2501 // Please, refer to the description in the jvmtiThreadSate.hpp.
2502
2503 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2504 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2505 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2506 return k->name()->as_utf8();
2507 JVM_END
2508
2509
2510 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2511 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2512 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2513 // types will have length zero if this is not an InstanceKlass
2514 // (length is determined by call to JVM_GetClassCPEntriesCount)
2515 if (k->is_instance_klass()) {
2516 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2517 for (int index = cp->length() - 1; index >= 0; index--) {
2518 constantTag tag = cp->tag_at(index);
2519 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2520 }
2521 }
2522 JVM_END
2523
2524
2525 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2526 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2527 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2528 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2529 JVM_END
2530
2531
2532 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2533 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2534 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2535 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2536 JVM_END
2537
2538
2539 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2540 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2541 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2542 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2543 JVM_END
2544
2545
2546 // The following methods, used for the verifier, are never called with
2547 // array klasses, so a direct cast to InstanceKlass is safe.
2548 // Typically, these methods are called in a loop with bounds determined
2549 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2550 // zero for arrays.
2551 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2552 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2553 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2554 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2555 int length = method->checked_exceptions_length();
2556 if (length > 0) {
2557 CheckedExceptionElement* table= method->checked_exceptions_start();
2558 for (int i = 0; i < length; i++) {
2559 exceptions[i] = table[i].class_cp_index;
2560 }
2561 }
2562 JVM_END
2563
2564
2565 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2566 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2567 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2568 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2569 return method->checked_exceptions_length();
2570 JVM_END
2571
2572
2573 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2574 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2575 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2576 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2577 memcpy(code, method->code_base(), method->code_size());
2578 JVM_END
2579
2580
2581 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2582 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2583 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2584 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2585 return method->code_size();
2586 JVM_END
2587
2588
2589 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2590 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2591 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2592 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2593 ExceptionTable extable(method);
2594 entry->start_pc = extable.start_pc(entry_index);
2595 entry->end_pc = extable.end_pc(entry_index);
2596 entry->handler_pc = extable.handler_pc(entry_index);
2597 entry->catchType = extable.catch_type_index(entry_index);
2598 JVM_END
2599
2600
2601 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2603 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2604 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2605 return method->exception_table_length();
2606 JVM_END
2607
2608
2609 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2610 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2611 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2612 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2613 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2614 JVM_END
2615
2616
2617 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2618 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2619 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2620 return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2621 JVM_END
2622
2623
2624 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2625 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2626 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2627 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2628 return method->max_locals();
2629 JVM_END
2630
2631
2632 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2633 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2634 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2635 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2636 return method->size_of_parameters();
2637 JVM_END
2638
2639
2640 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_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 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2644 return method->verifier_max_stack();
2645 JVM_END
2646
2647
2648 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2649 ResourceMark rm(THREAD);
2650 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2651 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2652 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2653 return method->name() == vmSymbols::object_initializer_name();
2654 JVM_END
2655
2656
2657 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2658 ResourceMark rm(THREAD);
2659 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2660 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2661 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2662 return method->is_overpass();
2663 JVM_END
2664
2665 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2666 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2667 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2668 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2669 return method->name()->as_utf8();
2670 JVM_END
2671
2672
2673 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2674 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2675 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2676 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2677 return method->signature()->as_utf8();
2678 JVM_END
2679
2680 /**
2681 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2682 * read entries in the constant pool. Since the old verifier always
2683 * works on a copy of the code, it will not see any rewriting that
2684 * may possibly occur in the middle of verification. So it is important
2685 * that nothing it calls tries to use the cpCache instead of the raw
2686 * constant pool, so we must use cp->uncached_x methods when appropriate.
2687 */
2688 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2689 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2690 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2691 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2692 switch (cp->tag_at(cp_index).value()) {
2693 case JVM_CONSTANT_Fieldref:
2694 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2695 default:
2696 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2697 }
2698 ShouldNotReachHere();
2699 return nullptr;
2700 JVM_END
2701
2702
2703 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2704 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2705 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2706 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2707 switch (cp->tag_at(cp_index).value()) {
2708 case JVM_CONSTANT_InterfaceMethodref:
2709 case JVM_CONSTANT_Methodref:
2710 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2711 default:
2712 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2713 }
2714 ShouldNotReachHere();
2715 return nullptr;
2716 JVM_END
2717
2718
2719 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2720 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2721 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2722 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2723 switch (cp->tag_at(cp_index).value()) {
2724 case JVM_CONSTANT_InterfaceMethodref:
2725 case JVM_CONSTANT_Methodref:
2726 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2727 default:
2728 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2729 }
2730 ShouldNotReachHere();
2731 return nullptr;
2732 JVM_END
2733
2734
2735 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2736 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2737 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2738 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2739 switch (cp->tag_at(cp_index).value()) {
2740 case JVM_CONSTANT_Fieldref:
2741 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2742 default:
2743 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2744 }
2745 ShouldNotReachHere();
2746 return nullptr;
2747 JVM_END
2748
2749
2750 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2751 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2752 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2753 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2754 Symbol* classname = cp->klass_name_at(cp_index);
2755 return classname->as_utf8();
2756 JVM_END
2757
2758
2759 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2760 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2761 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2762 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2763 switch (cp->tag_at(cp_index).value()) {
2764 case JVM_CONSTANT_Fieldref: {
2765 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2766 Symbol* classname = cp->klass_name_at(class_index);
2767 return classname->as_utf8();
2768 }
2769 default:
2770 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2771 }
2772 ShouldNotReachHere();
2773 return nullptr;
2774 JVM_END
2775
2776
2777 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2778 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2779 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2780 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2781 switch (cp->tag_at(cp_index).value()) {
2782 case JVM_CONSTANT_Methodref:
2783 case JVM_CONSTANT_InterfaceMethodref: {
2784 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2785 Symbol* classname = cp->klass_name_at(class_index);
2786 return classname->as_utf8();
2787 }
2788 default:
2789 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2790 }
2791 ShouldNotReachHere();
2792 return nullptr;
2793 JVM_END
2794
2795
2796 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2797 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2798 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2799 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2800 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2801 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2802 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2803 switch (cp->tag_at(cp_index).value()) {
2804 case JVM_CONSTANT_Fieldref: {
2805 Symbol* name = cp->uncached_name_ref_at(cp_index);
2806 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2807 InstanceKlass* ik = InstanceKlass::cast(k_called);
2808 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2809 if (fs.name() == name && fs.signature() == signature) {
2810 return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2811 }
2812 }
2813 return -1;
2814 }
2815 default:
2816 fatal("JVM_GetCPFieldModifiers: illegal constant");
2817 }
2818 ShouldNotReachHere();
2819 return 0;
2820 JVM_END
2821
2822
2823 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2824 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2825 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2826 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2827 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2828 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2829 switch (cp->tag_at(cp_index).value()) {
2830 case JVM_CONSTANT_Methodref:
2831 case JVM_CONSTANT_InterfaceMethodref: {
2832 Symbol* name = cp->uncached_name_ref_at(cp_index);
2833 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2834 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2835 int methods_count = methods->length();
2836 for (int i = 0; i < methods_count; i++) {
2837 Method* method = methods->at(i);
2838 if (method->name() == name && method->signature() == signature) {
2839 return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2840 }
2841 }
2842 return -1;
2843 }
2844 default:
2845 fatal("JVM_GetCPMethodModifiers: illegal constant");
2846 }
2847 ShouldNotReachHere();
2848 return 0;
2849 JVM_END
2850
2851
2852 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2853
2854 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2855 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2856 JVM_END
2857
2858
2859 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2860 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2861 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2862 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2863 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2864 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2865 JVM_END
2866
2867 // Printing support //////////////////////////////////////////////////
2868 extern "C" {
2869
2870 ATTRIBUTE_PRINTF(3, 0)
2871 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2872 // Reject count values that are negative signed values converted to
2873 // unsigned; see bug 4399518, 4417214
2874 if ((intptr_t)count <= 0) return -1;
2875
2876 int result = os::vsnprintf(str, count, fmt, args);
2877 if (result > 0 && (size_t)result >= count) {
2878 result = -1;
2879 }
2880
2881 return result;
2882 }
2883
2884 ATTRIBUTE_PRINTF(3, 4)
2885 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2886 va_list args;
2887 int len;
2888 va_start(args, fmt);
2889 len = jio_vsnprintf(str, count, fmt, args);
2890 va_end(args);
2891 return len;
2892 }
2893
2894 ATTRIBUTE_PRINTF(2, 3)
2895 int jio_fprintf(FILE* f, const char *fmt, ...) {
2896 int len;
2897 va_list args;
2898 va_start(args, fmt);
2899 len = jio_vfprintf(f, fmt, args);
2900 va_end(args);
2901 return len;
2902 }
2903
2904 ATTRIBUTE_PRINTF(2, 0)
2905 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2906 if (Arguments::vfprintf_hook() != nullptr) {
2907 return Arguments::vfprintf_hook()(f, fmt, args);
2908 } else {
2909 return vfprintf(f, fmt, args);
2910 }
2911 }
2912
2913 ATTRIBUTE_PRINTF(1, 2)
2914 JNIEXPORT int jio_printf(const char *fmt, ...) {
2915 int len;
2916 va_list args;
2917 va_start(args, fmt);
2918 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2919 va_end(args);
2920 return len;
2921 }
2922
2923 // HotSpot specific jio method
2924 void jio_print(const char* s, size_t len) {
2925 // Try to make this function as atomic as possible.
2926 if (Arguments::vfprintf_hook() != nullptr) {
2927 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2928 } else {
2929 // Make an unused local variable to avoid warning from gcc compiler.
2930 bool dummy = os::write(defaultStream::output_fd(), s, len);
2931 }
2932 }
2933
2934 } // Extern C
2935
2936 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2937
2938 // In most of the JVM thread support functions we need to access the
2939 // thread through a ThreadsListHandle to prevent it from exiting and
2940 // being reclaimed while we try to operate on it. The exceptions to this
2941 // rule are when operating on the current thread, or if the monitor of
2942 // the target java.lang.Thread is locked at the Java level - in both
2943 // cases the target cannot exit.
2944
2945 static void thread_entry(JavaThread* thread, TRAPS) {
2946 HandleMark hm(THREAD);
2947 Handle obj(THREAD, thread->threadObj());
2948 JavaValue result(T_VOID);
2949 JavaCalls::call_virtual(&result,
2950 obj,
2951 vmClasses::Thread_klass(),
2952 vmSymbols::run_method_name(),
2953 vmSymbols::void_method_signature(),
2954 THREAD);
2955 }
2956
2957
2958 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2959 #if INCLUDE_CDS
2960 if (CDSConfig::is_dumping_static_archive()) {
2961 // During java -Xshare:dump, if we allow multiple Java threads to
2962 // execute in parallel, symbols and classes may be loaded in
2963 // random orders which will make the resulting CDS archive
2964 // non-deterministic.
2965 //
2966 // Lucikly, during java -Xshare:dump, it's important to run only
2967 // the code in the main Java thread (which is NOT started here) that
2968 // creates the module graph, etc. It's safe to not start the other
2969 // threads which are launched by class static initializers
2970 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2971 if (log_is_enabled(Info, cds)) {
2972 ResourceMark rm;
2973 oop t = JNIHandles::resolve_non_null(jthread);
2974 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2975 }
2976 return;
2977 }
2978 #endif
2979 JavaThread *native_thread = nullptr;
2980
2981 // We cannot hold the Threads_lock when we throw an exception,
2982 // due to rank ordering issues. Example: we might need to grab the
2983 // Heap_lock while we construct the exception.
2984 bool throw_illegal_thread_state = false;
2985
2986 // We must release the Threads_lock before we can post a jvmti event
2987 // in Thread::start.
2988 {
2989 // Ensure that the C++ Thread and OSThread structures aren't freed before
2990 // we operate.
2991 MutexLocker mu(Threads_lock);
2992
2993 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2994 // re-starting an already started thread, so we should usually find
2995 // that the JavaThread is null. However for a JNI attached thread
2996 // there is a small window between the Thread object being created
2997 // (with its JavaThread set) and the update to its threadStatus, so we
2998 // have to check for this
2999 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
3000 throw_illegal_thread_state = true;
3001 } else {
3002 jlong size =
3003 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
3004 // Allocate the C++ Thread structure and create the native thread. The
3005 // stack size retrieved from java is 64-bit signed, but the constructor takes
3006 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
3007 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
3008 // - Avoid passing negative values which would result in really large stacks.
3009 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3010 size_t sz = size > 0 ? (size_t) size : 0;
3011 native_thread = new JavaThread(&thread_entry, sz);
3012
3013 // At this point it may be possible that no osthread was created for the
3014 // JavaThread due to lack of memory. Check for this situation and throw
3015 // an exception if necessary. Eventually we may want to change this so
3016 // that we only grab the lock if the thread was created successfully -
3017 // then we can also do this check and throw the exception in the
3018 // JavaThread constructor.
3019 if (native_thread->osthread() != nullptr) {
3020 // Note: the current thread is not being used within "prepare".
3021 native_thread->prepare(jthread);
3022 }
3023 }
3024 }
3025
3026 if (throw_illegal_thread_state) {
3027 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3028 }
3029
3030 assert(native_thread != nullptr, "Starting null thread?");
3031
3032 if (native_thread->osthread() == nullptr) {
3033 ResourceMark rm(thread);
3034 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3035 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3036 // No one should hold a reference to the 'native_thread'.
3037 native_thread->smr_delete();
3038 if (JvmtiExport::should_post_resource_exhausted()) {
3039 JvmtiExport::post_resource_exhausted(
3040 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3041 os::native_thread_creation_failed_msg());
3042 }
3043 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3044 os::native_thread_creation_failed_msg());
3045 }
3046
3047 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3048
3049 Thread::start(native_thread);
3050
3051 JVM_END
3052
3053
3054 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3055 ThreadsListHandle tlh(thread);
3056 oop java_thread = nullptr;
3057 JavaThread* receiver = nullptr;
3058 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3059 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3060
3061 if (is_alive) {
3062 // jthread refers to a live JavaThread.
3063 Thread::set_priority(receiver, (ThreadPriority)prio);
3064 }
3065 // Implied else: If the JavaThread hasn't started yet, then the
3066 // priority set in the java.lang.Thread object above will be pushed
3067 // down when it does start.
3068 JVM_END
3069
3070
3071 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3072 if (os::dont_yield()) return;
3073 HOTSPOT_THREAD_YIELD();
3074 os::naked_yield();
3075 JVM_END
3076
3077 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3078 if (nanos < 0) {
3079 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3080 }
3081
3082 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3083 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3084 }
3085
3086 // Save current thread state and restore it at the end of this block.
3087 // And set new thread state to SLEEPING.
3088 JavaThreadSleepState jtss(thread);
3089
3090 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3091
3092 if (nanos == 0) {
3093 os::naked_yield();
3094 } else {
3095 ThreadState old_state = thread->osthread()->get_state();
3096 thread->osthread()->set_state(SLEEPING);
3097 if (!thread->sleep_nanos(nanos)) { // interrupted
3098 // An asynchronous exception could have been thrown on
3099 // us while we were sleeping. We do not overwrite those.
3100 if (!HAS_PENDING_EXCEPTION) {
3101 HOTSPOT_THREAD_SLEEP_END(1);
3102
3103 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3104 // to properly restore the thread state. That's likely wrong.
3105 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3106 }
3107 }
3108 thread->osthread()->set_state(old_state);
3109 }
3110 HOTSPOT_THREAD_SLEEP_END(0);
3111 JVM_END
3112
3113 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3114 oop jthread = thread->threadObj();
3115 assert(jthread != nullptr, "no current carrier thread!");
3116 return JNIHandles::make_local(THREAD, jthread);
3117 JVM_END
3118
3119 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3120 oop theThread = thread->vthread();
3121 assert(theThread != (oop)nullptr, "no current thread!");
3122 return JNIHandles::make_local(THREAD, theThread);
3123 JVM_END
3124
3125 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3126 jobject theThread))
3127 oop threadObj = JNIHandles::resolve(theThread);
3128 thread->set_vthread(threadObj);
3129 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3130 JVM_END
3131
3132 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3133 return ThreadIdentifier::unsafe_offset();
3134 JVM_END
3135
3136 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3137 ThreadsListHandle tlh(thread);
3138 JavaThread* receiver = nullptr;
3139 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3140 if (is_alive) {
3141 // jthread refers to a live JavaThread.
3142 receiver->interrupt();
3143 }
3144 JVM_END
3145
3146 // Return true iff the current thread has locked the object passed in
3147
3148 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3149 if (obj == nullptr) {
3150 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3151 }
3152 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3153 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3154 JVM_END
3155
3156 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3157 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3158 return JNIHandles::make_local(THREAD, trace);
3159 JVM_END
3160
3161 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3162 VM_PrintThreads op;
3163 VMThread::execute(&op);
3164 if (JvmtiExport::should_post_data_dump()) {
3165 JvmtiExport::post_data_dump();
3166 }
3167 JVM_END
3168
3169 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3170 // We don't use a ThreadsListHandle here because the current thread
3171 // must be alive.
3172 oop java_thread = JNIHandles::resolve_non_null(jthread);
3173 JavaThread* thr = java_lang_Thread::thread(java_thread);
3174 if (thread == thr && !thr->has_attached_via_jni()) {
3175 // Thread naming is only supported for the current thread and
3176 // we don't set the name of an attached thread to avoid stepping
3177 // on other programs.
3178 ResourceMark rm(thread);
3179 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3180 os::set_native_thread_name(thread_name);
3181 }
3182 JVM_END
3183
3184 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3185 oop theCache = thread->scopedValueCache();
3186 return JNIHandles::make_local(THREAD, theCache);
3187 JVM_END
3188
3189 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3190 jobject theCache))
3191 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3192 thread->set_scopedValueCache(objs);
3193 JVM_END
3194
3195 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3196
3197 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3198 ResourceMark rm(THREAD);
3199 JvmtiVMObjectAllocEventCollector oam;
3200 vframeStream vfst(thread);
3201
3202 if (vmClasses::reflect_CallerSensitive_klass() != nullptr) {
3203 // This must only be called from SecurityManager.getClassContext
3204 Method* m = vfst.method();
3205 if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3206 m->name() == vmSymbols::getClassContext_name() &&
3207 m->signature() == vmSymbols::void_class_array_signature())) {
3208 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3209 }
3210 }
3211
3212 // Collect method holders
3213 GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3214 for (; !vfst.at_end(); vfst.security_next()) {
3215 Method* m = vfst.method();
3216 // Native frames are not returned
3217 if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3218 Klass* holder = m->method_holder();
3219 assert(holder->is_klass(), "just checking");
3220 klass_array->append(holder);
3221 }
3222 }
3223
3224 // Create result array of type [Ljava/lang/Class;
3225 objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3226 // Fill in mirrors corresponding to method holders
3227 for (int i = 0; i < klass_array->length(); i++) {
3228 result->obj_at_put(i, klass_array->at(i)->java_mirror());
3229 }
3230
3231 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3232 JVM_END
3233
3234
3235 // java.lang.Package ////////////////////////////////////////////////////////////////
3236
3237
3238 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3239 ResourceMark rm(THREAD);
3240 JvmtiVMObjectAllocEventCollector oam;
3241 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3242 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3243 return (jstring) JNIHandles::make_local(THREAD, result);
3244 JVM_END
3245
3246
3247 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3248 JvmtiVMObjectAllocEventCollector oam;
3249 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3250 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3251 JVM_END
3252
3253
3254 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3255
3256
3257 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3258 MonitorLocker ml(Heap_lock);
3259 oop ref = Universe::reference_pending_list();
3260 if (ref != nullptr) {
3261 Universe::clear_reference_pending_list();
3262 }
3263 return JNIHandles::make_local(THREAD, ref);
3264 JVM_END
3265
3266 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3267 MonitorLocker ml(Heap_lock);
3268 return Universe::has_reference_pending_list();
3269 JVM_END
3270
3271 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3272 MonitorLocker ml(Heap_lock);
3273 while (!Universe::has_reference_pending_list()) {
3274 ml.wait();
3275 }
3276 JVM_END
3277
3278 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3279 oop ref_oop = JNIHandles::resolve_non_null(ref);
3280 // PhantomReference has it's own implementation of refersTo().
3281 // See: JVM_PhantomReferenceRefersTo
3282 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3283 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3284 return referent == JNIHandles::resolve(o);
3285 JVM_END
3286
3287 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3288 oop ref_oop = JNIHandles::resolve_non_null(ref);
3289 // FinalReference has it's own implementation of clear().
3290 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3291 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3292 // If the referent has already been cleared then done.
3293 // However, if the referent is dead but has not yet been cleared by
3294 // concurrent reference processing, it should NOT be cleared here.
3295 // Instead, clearing should be left to the GC. Clearing it here could
3296 // detectably lose an expected notification, which is impossible with
3297 // STW reference processing. The clearing in enqueue() doesn't have
3298 // this problem, since the enqueue covers the notification, but it's not
3299 // worth the effort to handle that case specially.
3300 return;
3301 }
3302 java_lang_ref_Reference::clear_referent(ref_oop);
3303 JVM_END
3304
3305
3306 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3307
3308
3309 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3310 oop ref_oop = JNIHandles::resolve_non_null(ref);
3311 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3312 return referent == JNIHandles::resolve(o);
3313 JVM_END
3314
3315
3316 // ObjectInputStream ///////////////////////////////////////////////////////////////
3317
3318 // Return the first user-defined class loader up the execution stack, or null
3319 // if only code from the bootstrap or platform class loader is on the stack.
3320
3321 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3322 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3323 InstanceKlass* ik = vfst.method()->method_holder();
3324 oop loader = ik->class_loader();
3325 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3326 // Skip reflection related frames
3327 if (!ik->is_subclass_of(vmClasses::reflect_SerializationConstructorAccessorImpl_klass())) {
3328 return JNIHandles::make_local(THREAD, loader);
3329 }
3330 }
3331 }
3332 return nullptr;
3333 JVM_END
3334
3335
3336 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3337
3338
3339 // resolve array handle and check arguments
3340 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3341 if (arr == nullptr) {
3342 THROW_0(vmSymbols::java_lang_NullPointerException());
3343 }
3344 oop a = JNIHandles::resolve_non_null(arr);
3345 if (!a->is_array()) {
3346 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3347 } else if (type_array_only && !a->is_typeArray()) {
3348 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3349 }
3350 return arrayOop(a);
3351 }
3352
3353
3354 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3355 arrayOop a = check_array(env, arr, false, CHECK_0);
3356 return a->length();
3357 JVM_END
3358
3359
3360 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3361 JvmtiVMObjectAllocEventCollector oam;
3362 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3363 jvalue value;
3364 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3365 oop box = Reflection::box(&value, type, CHECK_NULL);
3366 return JNIHandles::make_local(THREAD, box);
3367 JVM_END
3368
3369
3370 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3371 jvalue value;
3372 value.i = 0; // to initialize value before getting used in CHECK
3373 arrayOop a = check_array(env, arr, true, CHECK_(value));
3374 assert(a->is_typeArray(), "just checking");
3375 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3376 BasicType wide_type = (BasicType) wCode;
3377 if (type != wide_type) {
3378 Reflection::widen(&value, type, wide_type, CHECK_(value));
3379 }
3380 return value;
3381 JVM_END
3382
3383
3384 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3385 arrayOop a = check_array(env, arr, false, CHECK);
3386 oop box = JNIHandles::resolve(val);
3387 jvalue value;
3388 value.i = 0; // to initialize value before getting used in CHECK
3389 BasicType value_type;
3390 if (a->is_objArray()) {
3391 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3392 value_type = Reflection::unbox_for_regular_object(box, &value);
3393 } else {
3394 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3395 }
3396 Reflection::array_set(&value, a, index, value_type, CHECK);
3397 JVM_END
3398
3399
3400 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3401 arrayOop a = check_array(env, arr, true, CHECK);
3402 assert(a->is_typeArray(), "just checking");
3403 BasicType value_type = (BasicType) vCode;
3404 Reflection::array_set(&v, a, index, value_type, CHECK);
3405 JVM_END
3406
3407
3408 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3409 JvmtiVMObjectAllocEventCollector oam;
3410 oop element_mirror = JNIHandles::resolve(eltClass);
3411 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3412 return JNIHandles::make_local(THREAD, result);
3413 JVM_END
3414
3415
3416 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3417 JvmtiVMObjectAllocEventCollector oam;
3418 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3419 oop element_mirror = JNIHandles::resolve(eltClass);
3420 assert(dim_array->is_typeArray(), "just checking");
3421 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3422 return JNIHandles::make_local(THREAD, result);
3423 JVM_END
3424
3425
3426 // Library support ///////////////////////////////////////////////////////////////////////////
3427
3428 JVM_LEAF(void*, JVM_LoadZipLibrary())
3429 return ZipLibrary::handle();
3430 JVM_END
3431
3432 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3433 //%note jvm_ct
3434 char ebuf[1024];
3435 void *load_result;
3436 {
3437 ThreadToNativeFromVM ttnfvm(thread);
3438 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3439 }
3440 if (load_result == nullptr) {
3441 if (throwException) {
3442 char msg[1024];
3443 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3444 // Since 'ebuf' may contain a string encoded using
3445 // platform encoding scheme, we need to pass
3446 // Exceptions::unsafe_to_utf8 to the new_exception method
3447 // as the last argument. See bug 6367357.
3448 Handle h_exception =
3449 Exceptions::new_exception(thread,
3450 vmSymbols::java_lang_UnsatisfiedLinkError(),
3451 msg, Exceptions::unsafe_to_utf8);
3452
3453 THROW_HANDLE_0(h_exception);
3454 } else {
3455 log_info(library)("Failed to load library %s", name);
3456 return load_result;
3457 }
3458 }
3459 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3460 return load_result;
3461 JVM_END
3462
3463
3464 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3465 os::dll_unload(handle);
3466 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3467 JVM_END
3468
3469
3470 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3471 void* find_result = os::dll_lookup(handle, name);
3472 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3473 find_result != nullptr ? "Found" : "Failed to find",
3474 name, p2i(handle));
3475 return find_result;
3476 JVM_END
3477
3478
3479 // JNI version ///////////////////////////////////////////////////////////////////////////////
3480
3481 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3482 return Threads::is_supported_jni_version_including_1_1(version);
3483 JVM_END
3484
3485
3486 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3487 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3488 JVM_END
3489
3490 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3491 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3492 JVM_END
3493
3494 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3495 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3496 JVM_END
3497
3498 // String support ///////////////////////////////////////////////////////////////////////////
3499
3500 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3501 JvmtiVMObjectAllocEventCollector oam;
3502 if (str == nullptr) return nullptr;
3503 oop string = JNIHandles::resolve_non_null(str);
3504 oop result = StringTable::intern(string, CHECK_NULL);
3505 return (jstring) JNIHandles::make_local(THREAD, result);
3506 JVM_END
3507
3508
3509 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3510
3511 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3512 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3513 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3514 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3515 // nature. JavaThreads will be "in native" when using this API from JDK code.
3516
3517
3518 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3519 VM_Exit::block_if_vm_exited();
3520 return new PlatformMutex();
3521 }
3522
3523
3524 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3525 VM_Exit::block_if_vm_exited();
3526 delete ((PlatformMutex*) mon);
3527 }
3528
3529
3530 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3531 VM_Exit::block_if_vm_exited();
3532 ((PlatformMutex*) mon)->lock();
3533 return 0;
3534 }
3535
3536
3537 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3538 VM_Exit::block_if_vm_exited();
3539 ((PlatformMutex*) mon)->unlock();
3540 }
3541
3542
3543 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3544
3545 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3546 Handle loader, Handle protection_domain,
3547 jboolean throwError, TRAPS) {
3548 // Security Note:
3549 // The Java level wrapper will perform the necessary security check allowing
3550 // us to pass the null as the initiating class loader. The VM is responsible for
3551 // the checkPackageAccess relative to the initiating class loader via the
3552 // protection_domain. The protection_domain is passed as null by the java code
3553 // if there is no security manager in 3-arg Class.forName().
3554 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3555
3556 // Check if we should initialize the class
3557 if (init && klass->is_instance_klass()) {
3558 klass->initialize(CHECK_NULL);
3559 }
3560 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3561 }
3562
3563
3564 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3565
3566 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3567 Handle method_handle;
3568 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3569 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3570 Handle receiver(THREAD, JNIHandles::resolve(obj));
3571 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3572 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3573 jobject res = JNIHandles::make_local(THREAD, result);
3574 if (JvmtiExport::should_post_vm_object_alloc()) {
3575 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3576 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3577 if (java_lang_Class::is_primitive(ret_type)) {
3578 // Only for primitive type vm allocates memory for java object.
3579 // See box() method.
3580 JvmtiExport::post_vm_object_alloc(thread, result);
3581 }
3582 }
3583 return res;
3584 } else {
3585 THROW_0(vmSymbols::java_lang_StackOverflowError());
3586 }
3587 JVM_END
3588
3589
3590 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3591 oop constructor_mirror = JNIHandles::resolve(c);
3592 objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3593 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3594 jobject res = JNIHandles::make_local(THREAD, result);
3595 if (JvmtiExport::should_post_vm_object_alloc()) {
3596 JvmtiExport::post_vm_object_alloc(thread, result);
3597 }
3598 return res;
3599 JVM_END
3600
3601 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3603 assert(k->is_klass(), "just checking");
3604 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3605 JVM_END
3606
3607 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3608 jclass caller,
3609 jstring interfaceMethodName,
3610 jobject factoryType,
3611 jobject interfaceMethodType,
3612 jobject implementationMember,
3613 jobject dynamicMethodType,
3614 jclass lambdaProxyClass))
3615 #if INCLUDE_CDS
3616 if (!CDSConfig::is_dumping_archive()) {
3617 return;
3618 }
3619
3620 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3621 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3622 if (caller_ik->is_hidden()) {
3623 // Hidden classes not of type lambda proxy classes are currently not being archived.
3624 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3625 // registered for archiving.
3626 return;
3627 }
3628 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3629 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3630 assert(lambda_ik->is_hidden(), "must be a hidden class");
3631 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3632
3633 Symbol* interface_method_name = nullptr;
3634 if (interfaceMethodName != nullptr) {
3635 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3636 }
3637 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3638 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3639
3640 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3641 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3642
3643 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3644 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3645 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3646
3647 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3648 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3649
3650 SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3651 interface_method_type, m, dynamic_method_type, THREAD);
3652 #endif // INCLUDE_CDS
3653 JVM_END
3654
3655 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3656 jclass caller,
3657 jstring interfaceMethodName,
3658 jobject factoryType,
3659 jobject interfaceMethodType,
3660 jobject implementationMember,
3661 jobject dynamicMethodType))
3662 #if INCLUDE_CDS
3663
3664 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3665 implementationMember == nullptr || dynamicMethodType == nullptr) {
3666 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3667 }
3668
3669 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3670 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3671 if (!caller_ik->is_shared()) {
3672 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3673 return nullptr;
3674 }
3675
3676 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3677 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3678 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3679
3680 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3681 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3682
3683 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3684 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3685 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3686
3687 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3688 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3689
3690 InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3691 interface_method_type, m, dynamic_method_type);
3692 jclass jcls = nullptr;
3693 if (lambda_ik != nullptr) {
3694 InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3695 jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3696 }
3697 return jcls;
3698 #else
3699 return nullptr;
3700 #endif // INCLUDE_CDS
3701 JVM_END
3702
3703 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3704 if (CDSConfig::is_dumping_static_archive()) {
3705 // We do this so that the default CDS archive can be deterministic.
3706 const char* release = VM_Version::vm_release();
3707 const char* dbg_level = VM_Version::jdk_debug_level();
3708 const char* version = VM_Version::internal_vm_info_string();
3709 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3710 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3711 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3712 seed += (jlong)VM_Version::vm_major_version();
3713 seed += (jlong)VM_Version::vm_minor_version();
3714 seed += (jlong)VM_Version::vm_security_version();
3715 seed += (jlong)VM_Version::vm_patch_version();
3716 if (seed == 0) { // don't let this ever be zero.
3717 seed = 0x87654321;
3718 }
3719 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3720 return seed;
3721 } else {
3722 return 0;
3723 }
3724 JVM_END
3725
3726 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3727 return CDSConfig::get_status();
3728 JVM_END
3729
3730 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3731 #if INCLUDE_CDS
3732 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3733 if (line != nullptr) {
3734 ResourceMark rm(THREAD);
3735 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3736 char* c_line = java_lang_String::as_utf8_string(h_line());
3737 if (CDSConfig::is_dumping_dynamic_archive()) {
3738 // Note: LambdaFormInvokers::append take same format which is not
3739 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3740 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3741 }
3742 if (ClassListWriter::is_enabled()) {
3743 ClassListWriter w;
3744 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3745 }
3746 }
3747 #endif // INCLUDE_CDS
3748 JVM_END
3749
3750 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3751 #if INCLUDE_CDS
3752 ResourceMark rm(THREAD);
3753 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3754 char* file_name = java_lang_String::as_utf8_string(file_handle());
3755 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3756 #endif // INCLUDE_CDS
3757 JVM_END
3758
3759 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3760 #if INCLUDE_CDS
3761 ResourceMark rm(THREAD);
3762 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3763 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3764 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3765 #endif // INCLUDE_CDS
3766 JVM_END
3767
3768 // Returns an array of all live Thread objects (VM internal JavaThreads,
3769 // jvmti agent threads, and JNI attaching threads are skipped)
3770 // See CR 6404306 regarding JNI attaching threads
3771 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3772 ResourceMark rm(THREAD);
3773 ThreadsListEnumerator tle(THREAD, false, false);
3774 JvmtiVMObjectAllocEventCollector oam;
3775
3776 int num_threads = tle.num_threads();
3777 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3778 objArrayHandle threads_ah(THREAD, r);
3779
3780 for (int i = 0; i < num_threads; i++) {
3781 Handle h = tle.get_threadObj(i);
3782 threads_ah->obj_at_put(i, h());
3783 }
3784
3785 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3786 JVM_END
3787
3788
3789 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3790 // Return StackTraceElement[][], each element is the stack trace of a thread in
3791 // the corresponding entry in the given threads array
3792 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3793 JvmtiVMObjectAllocEventCollector oam;
3794
3795 // Check if threads is null
3796 if (threads == nullptr) {
3797 THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3798 }
3799
3800 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3801 objArrayHandle ah(THREAD, a);
3802 int num_threads = ah->length();
3803 // check if threads is non-empty array
3804 if (num_threads == 0) {
3805 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3806 }
3807
3808 // check if threads is not an array of objects of Thread class
3809 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3810 if (k != vmClasses::Thread_klass()) {
3811 THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3812 }
3813
3814 ResourceMark rm(THREAD);
3815
3816 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3817 for (int i = 0; i < num_threads; i++) {
3818 oop thread_obj = ah->obj_at(i);
3819 instanceHandle h(THREAD, (instanceOop) thread_obj);
3820 thread_handle_array->append(h);
3821 }
3822
3823 // The JavaThread references in thread_handle_array are validated
3824 // in VM_ThreadDump::doit().
3825 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3826 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3827
3828 JVM_END
3829
3830 // JVM monitoring and management support
3831 JVM_LEAF(void*, JVM_GetManagement(jint version))
3832 return Management::get_jmm_interface(version);
3833 JVM_END
3834
3835 // com.sun.tools.attach.VirtualMachine agent properties support
3836 //
3837 // Initialize the agent properties with the properties maintained in the VM
3838 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3839 ResourceMark rm;
3840
3841 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3842
3843 PUTPROP(props, "sun.java.command", Arguments::java_command());
3844 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3845 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3846 return properties;
3847 JVM_END
3848
3849 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3850 {
3851 JvmtiVMObjectAllocEventCollector oam;
3852
3853 if (ofClass == nullptr) {
3854 return nullptr;
3855 }
3856 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3857 // Special handling for primitive objects
3858 if (java_lang_Class::is_primitive(mirror())) {
3859 return nullptr;
3860 }
3861 Klass* k = java_lang_Class::as_Klass(mirror());
3862 if (!k->is_instance_klass()) {
3863 return nullptr;
3864 }
3865 InstanceKlass* ik = InstanceKlass::cast(k);
3866 int encl_method_class_idx = ik->enclosing_method_class_index();
3867 if (encl_method_class_idx == 0) {
3868 return nullptr;
3869 }
3870 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3871 objArrayHandle dest(THREAD, dest_o);
3872 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3873 dest->obj_at_put(0, enc_k->java_mirror());
3874 int encl_method_method_idx = ik->enclosing_method_method_index();
3875 if (encl_method_method_idx != 0) {
3876 Symbol* sym = ik->constants()->symbol_at(
3877 extract_low_short_from_int(
3878 ik->constants()->name_and_type_at(encl_method_method_idx)));
3879 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3880 dest->obj_at_put(1, str());
3881 sym = ik->constants()->symbol_at(
3882 extract_high_short_from_int(
3883 ik->constants()->name_and_type_at(encl_method_method_idx)));
3884 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3885 dest->obj_at_put(2, str());
3886 }
3887 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3888 }
3889 JVM_END
3890
3891 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3892 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3893 ResourceMark rm(THREAD);
3894
3895 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3896 return nullptr;
3897 }
3898
3899 char** vm_flags = Arguments::jvm_flags_array();
3900 char** vm_args = Arguments::jvm_args_array();
3901 int num_flags = Arguments::num_jvm_flags();
3902 int num_args = Arguments::num_jvm_args();
3903
3904 InstanceKlass* ik = vmClasses::String_klass();
3905 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3906 objArrayHandle result_h(THREAD, r);
3907
3908 int index = 0;
3909 for (int j = 0; j < num_flags; j++, index++) {
3910 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3911 result_h->obj_at_put(index, h());
3912 }
3913 for (int i = 0; i < num_args; i++, index++) {
3914 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3915 result_h->obj_at_put(index, h());
3916 }
3917 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3918 JVM_END
3919
3920 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3921 return os::get_signal_number(name);
3922 JVM_END
3923
3924 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3925 #if INCLUDE_JVMTI
3926 if (!DoJVMTIVirtualThreadTransitions) {
3927 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3928 return;
3929 }
3930 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3931 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3932 } else {
3933 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3934 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3935 }
3936 #endif
3937 JVM_END
3938
3939 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3940 #if INCLUDE_JVMTI
3941 if (!DoJVMTIVirtualThreadTransitions) {
3942 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3943 return;
3944 }
3945 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3946 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3947 } else {
3948 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3949 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3950 }
3951 #endif
3952 JVM_END
3953
3954 // If notifications are disabled then just update the VTMS transition bit and return.
3955 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3956 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3957 #if INCLUDE_JVMTI
3958 if (!DoJVMTIVirtualThreadTransitions) {
3959 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3960 return;
3961 }
3962 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3963 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3964 } else {
3965 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3966 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3967 }
3968 #endif
3969 JVM_END
3970
3971 // If notifications are disabled then just update the VTMS transition bit and return.
3972 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3973 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3974 #if INCLUDE_JVMTI
3975 if (!DoJVMTIVirtualThreadTransitions) {
3976 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3977 return;
3978 }
3979 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3980 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3981 } else {
3982 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3983 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3984 }
3985 #endif
3986 JVM_END
3987
3988 // Always update the temporary VTMS transition bit.
3989 JVM_ENTRY(void, JVM_VirtualThreadHideFrames(JNIEnv* env, jclass clazz, jboolean hide))
3990 #if INCLUDE_JVMTI
3991 if (!DoJVMTIVirtualThreadTransitions) {
3992 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3993 return;
3994 }
3995 assert(!thread->is_in_VTMS_transition(), "sanity check");
3996 assert(thread->is_in_tmp_VTMS_transition() != (bool)hide, "sanity check");
3997 thread->toggle_is_in_tmp_VTMS_transition();
3998 #endif
3999 JVM_END
4000
4001 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
4002 // Needed to avoid deadlocks with JVMTI suspend mechanism.
4003 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
4004 #if INCLUDE_JVMTI
4005 if (!DoJVMTIVirtualThreadTransitions) {
4006 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4007 return;
4008 }
4009 assert(thread->is_disable_suspend() != (bool)enter,
4010 "nested or unbalanced monitor enter/exit is not allowed");
4011 thread->toggle_is_disable_suspend();
4012 #endif
4013 JVM_END
4014
4015 /*
4016 * Return the current class's class file version. The low order 16 bits of the
4017 * returned jint contain the class's major version. The high order 16 bits
4018 * contain the class's minor version.
4019 */
4020 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4021 oop mirror = JNIHandles::resolve_non_null(current);
4022 if (java_lang_Class::is_primitive(mirror)) {
4023 // return latest major version and minor version of 0.
4024 return JVM_CLASSFILE_MAJOR_VERSION;
4025 }
4026 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4027
4028 Klass* c = java_lang_Class::as_Klass(mirror);
4029 assert(c->is_instance_klass(), "must be");
4030 InstanceKlass* ik = InstanceKlass::cast(c);
4031 return (ik->minor_version() << 16) | ik->major_version();
4032 JVM_END
4033
4034 /*
4035 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4036 * get the value will see a materialized value and not a scalar-replaced
4037 * null value.
4038 */
4039 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4040 JVM_EnsureMaterializedForStackWalk(env, value);
4041 JVM_END
4042
4043 /*
4044 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4045 */
4046 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4047 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4048 JVM_END