1 /*
2 * Copyright (c) 1997, 2025, 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 "cds/aotClassInitializer.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 "cds/lambdaProxyClassDictionary.hpp"
33 #include "classfile/classFileStream.hpp"
34 #include "classfile/classLoader.inline.hpp"
35 #include "classfile/classLoaderData.hpp"
36 #include "classfile/classLoaderData.inline.hpp"
37 #include "classfile/classLoadInfo.hpp"
38 #include "classfile/javaAssertions.hpp"
39 #include "classfile/javaClasses.inline.hpp"
40 #include "classfile/moduleEntry.hpp"
41 #include "classfile/modules.hpp"
42 #include "classfile/packageEntry.hpp"
43 #include "classfile/stringTable.hpp"
44 #include "classfile/symbolTable.hpp"
45 #include "classfile/systemDictionary.hpp"
46 #include "classfile/vmClasses.hpp"
47 #include "classfile/vmSymbols.hpp"
48 #include "gc/shared/collectedHeap.inline.hpp"
49 #include "interpreter/bytecode.hpp"
50 #include "interpreter/bytecodeUtils.hpp"
51 #include "jfr/jfrEvents.hpp"
52 #include "jvm.h"
53 #include "logging/log.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/referenceType.hpp"
56 #include "memory/resourceArea.hpp"
57 #include "memory/universe.hpp"
58 #include "oops/access.inline.hpp"
59 #include "oops/constantPool.hpp"
60 #include "oops/fieldStreams.inline.hpp"
61 #include "oops/flatArrayKlass.hpp"
62 #include "oops/instanceKlass.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/method.hpp"
65 #include "oops/recordComponent.hpp"
66 #include "oops/objArrayKlass.hpp"
67 #include "oops/objArrayOop.inline.hpp"
68 #include "oops/oop.inline.hpp"
69 #include "prims/foreignGlobals.hpp"
70 #include "prims/jvm_misc.hpp"
71 #include "prims/jvmtiExport.hpp"
72 #include "prims/jvmtiThreadState.inline.hpp"
73 #include "prims/stackwalk.hpp"
74 #include "runtime/arguments.hpp"
75 #include "runtime/atomic.hpp"
76 #include "runtime/continuation.hpp"
77 #include "runtime/globals_extension.hpp"
78 #include "runtime/handles.inline.hpp"
79 #include "runtime/init.hpp"
80 #include "runtime/interfaceSupport.inline.hpp"
81 #include "runtime/deoptimization.hpp"
82 #include "runtime/handshake.hpp"
83 #include "runtime/java.hpp"
84 #include "runtime/javaCalls.hpp"
85 #include "runtime/javaThread.hpp"
86 #include "runtime/jfieldIDWorkaround.hpp"
87 #include "runtime/jniHandles.inline.hpp"
88 #include "runtime/os.inline.hpp"
89 #include "runtime/osThread.hpp"
90 #include "runtime/perfData.hpp"
91 #include "runtime/reflection.hpp"
92 #include "runtime/synchronizer.hpp"
93 #include "runtime/threadIdentifier.hpp"
94 #include "runtime/threadSMR.hpp"
95 #include "runtime/vframe.inline.hpp"
96 #include "runtime/vmOperations.hpp"
97 #include "runtime/vm_version.hpp"
98 #include "services/attachListener.hpp"
99 #include "services/management.hpp"
100 #include "services/threadService.hpp"
101 #include "utilities/checkedCast.hpp"
102 #include "utilities/copy.hpp"
103 #include "utilities/defaultStream.hpp"
104 #include "utilities/dtrace.hpp"
105 #include "utilities/events.hpp"
106 #include "utilities/macros.hpp"
107 #include "utilities/utf8.hpp"
108 #include "utilities/zipLibrary.hpp"
109 #if INCLUDE_CDS
110 #include "classfile/systemDictionaryShared.hpp"
111 #endif
112 #if INCLUDE_JFR
113 #include "jfr/jfr.hpp"
114 #endif
115 #if INCLUDE_MANAGEMENT
116 #include "services/finalizerService.hpp"
117 #endif
118 #ifdef LINUX
119 #include "osContainer_linux.hpp"
120 #endif
121
122 #include <errno.h>
123
124 /*
125 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
126 such ctors and calls MUST NOT come between an oop declaration/init and its
127 usage because if objects are move this may cause various memory stomps, bus
128 errors and segfaults. Here is a cookbook for causing so called "naked oop
129 failures":
130
131 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
132 // Object address to be held directly in mirror & not visible to GC
133 oop mirror = JNIHandles::resolve_non_null(ofClass);
134
135 // If this ctor can hit a safepoint, moving objects around, then
136 ComplexConstructor foo;
137
138 // Boom! mirror may point to JUNK instead of the intended object
139 (some dereference of mirror)
140
141 // Here's another call that may block for GC, making mirror stale
142 MutexLocker ml(some_lock);
143
144 // And here's an initializer that can result in a stale oop
145 // all in one step.
146 oop o = call_that_can_throw_exception(TRAPS);
147
148
149 The solution is to keep the oop declaration BELOW the ctor or function
150 call that might cause a GC, do another resolve to reassign the oop, or
151 consider use of a Handle instead of an oop so there is immunity from object
152 motion. But note that the "QUICK" entries below do not have a handlemark
153 and thus can only support use of handles passed in.
154 */
155
156 extern void trace_class_resolution(Klass* to_class) {
157 ResourceMark rm;
158 int line_number = -1;
159 const char * source_file = nullptr;
160 const char * trace = "explicit";
161 InstanceKlass* caller = nullptr;
162 JavaThread* jthread = JavaThread::current();
163 if (jthread->has_last_Java_frame()) {
164 vframeStream vfst(jthread);
165
166 // Scan up the stack skipping ClassLoader frames.
167 Method* last_caller = nullptr;
168
169 while (!vfst.at_end()) {
170 Method* m = vfst.method();
171 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
172 break;
173 }
174 last_caller = m;
175 vfst.next();
176 }
177 // if this is called from Class.forName0 and that is called from Class.forName,
178 // then print the caller of Class.forName. If this is Class.loadClass, then print
179 // that caller, otherwise keep quiet since this should be picked up elsewhere.
180 bool found_it = false;
181 if (!vfst.at_end() &&
182 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
183 vfst.method()->name() == vmSymbols::forName0_name()) {
184 vfst.next();
185 if (!vfst.at_end() &&
186 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
187 vfst.method()->name() == vmSymbols::forName_name()) {
188 vfst.next();
189 found_it = true;
190 }
191 } else if (last_caller != nullptr &&
192 last_caller->method_holder()->name() ==
193 vmSymbols::java_lang_ClassLoader() &&
194 last_caller->name() == vmSymbols::loadClass_name()) {
195 found_it = true;
196 } else if (!vfst.at_end()) {
197 if (vfst.method()->is_native()) {
198 // JNI call
199 found_it = true;
200 }
201 }
202 if (found_it && !vfst.at_end()) {
203 // found the caller
204 caller = vfst.method()->method_holder();
205 line_number = vfst.method()->line_number_from_bci(vfst.bci());
206 if (line_number == -1) {
207 // show method name if it's a native method
208 trace = vfst.method()->name_and_sig_as_C_string();
209 }
210 Symbol* s = caller->source_file_name();
211 if (s != nullptr) {
212 source_file = s->as_C_string();
213 }
214 }
215 }
216 if (caller != nullptr) {
217 if (to_class != caller) {
218 const char * from = caller->external_name();
219 const char * to = to_class->external_name();
220 // print in a single call to reduce interleaving between threads
221 if (source_file != nullptr) {
222 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
223 } else {
224 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
225 }
226 }
227 }
228 }
229
230 // java.lang.System //////////////////////////////////////////////////////////////////////
231
232
233 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
234 return os::javaTimeMillis();
235 JVM_END
236
237 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
238 return os::javaTimeNanos();
239 JVM_END
240
241 // The function below is actually exposed by jdk.internal.misc.VM and not
242 // java.lang.System, but we choose to keep it here so that it stays next
243 // to JVM_CurrentTimeMillis and JVM_NanoTime
244
245 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
246 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
247
248 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
249 jlong seconds;
250 jlong nanos;
251
252 os::javaTimeSystemUTC(seconds, nanos);
253
254 // We're going to verify that the result can fit in a long.
255 // For that we need the difference in seconds between 'seconds'
256 // and 'offset_secs' to be such that:
257 // |seconds - offset_secs| < (2^63/10^9)
258 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
259 // which makes |seconds - offset_secs| < 2^33
260 // and we will prefer +/- 2^32 as the maximum acceptable diff
261 // as 2^32 has a more natural feel than 2^33...
262 //
263 // So if |seconds - offset_secs| >= 2^32 - we return a special
264 // sentinel value (-1) which the caller should take as an
265 // exception value indicating that the offset given to us is
266 // too far from range of the current time - leading to too big
267 // a nano adjustment. The caller is expected to recover by
268 // computing a more accurate offset and calling this method
269 // again. (For the record 2^32 secs is ~136 years, so that
270 // should rarely happen)
271 //
272 jlong diff = seconds - offset_secs;
273 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
274 return -1; // sentinel value: the offset is too far off the target
275 }
276
277 // return the adjustment. If you compute a time by adding
278 // this number of nanoseconds along with the number of seconds
279 // in the offset you should get the current UTC time.
280 return (diff * (jlong)1000000000) + nanos;
281 JVM_END
282
283 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
284 jobject dst, jint dst_pos, jint length))
285 // Check if we have null pointers
286 if (src == nullptr || dst == nullptr) {
287 THROW(vmSymbols::java_lang_NullPointerException());
288 }
289 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
290 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
291 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
292 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
293 // Do copy
294 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
295 JVM_END
296
297
298 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
299 JavaValue r(T_OBJECT);
300 // public synchronized Object put(Object key, Object value);
301 HandleMark hm(THREAD);
302 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
303 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
304 JavaCalls::call_virtual(&r,
305 props,
306 vmClasses::Properties_klass(),
307 vmSymbols::put_name(),
308 vmSymbols::object_object_object_signature(),
309 key_str,
310 value_str,
311 THREAD);
312 }
313
314
315 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
316
317 /*
318 * Return all of the system properties in a Java String array with alternating
319 * names and values from the jvm SystemProperty.
320 * Which includes some internal and all commandline -D defined properties.
321 */
322 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
323 ResourceMark rm(THREAD);
324 HandleMark hm(THREAD);
325 int ndx = 0;
326 int fixedCount = 2;
327
328 SystemProperty* p = Arguments::system_properties();
329 int count = Arguments::PropertyList_count(p);
330
331 // Allocate result String array
332 InstanceKlass* ik = vmClasses::String_klass();
333 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
334 objArrayHandle result_h(THREAD, r);
335
336 while (p != nullptr) {
337 const char * key = p->key();
338 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
339 const char * value = p->value();
340 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
341 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
342 result_h->obj_at_put(ndx * 2, key_str());
343 result_h->obj_at_put(ndx * 2 + 1, value_str());
344 ndx++;
345 }
346 p = p->next();
347 }
348
349 // Convert the -XX:MaxDirectMemorySize= command line flag
350 // to the sun.nio.MaxDirectMemorySize property.
351 // Do this after setting user properties to prevent people
352 // from setting the value with a -D option, as requested.
353 // Leave empty if not supplied
354 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
355 char as_chars[256];
356 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
357 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
358 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
359 result_h->obj_at_put(ndx * 2, key_str());
360 result_h->obj_at_put(ndx * 2 + 1, value_str());
361 ndx++;
362 }
363
364 // JVM monitoring and management support
365 // Add the sun.management.compiler property for the compiler's name
366 {
367 #undef CSIZE
368 #if defined(_LP64)
369 #define CSIZE "64-Bit "
370 #else
371 #define CSIZE
372 #endif // 64bit
373
374 #if COMPILER1_AND_COMPILER2
375 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
376 #else
377 #if defined(COMPILER1)
378 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
379 #elif defined(COMPILER2)
380 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
381 #elif INCLUDE_JVMCI
382 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
383 #else
384 const char* compiler_name = "";
385 #endif // compilers
386 #endif // COMPILER1_AND_COMPILER2
387
388 if (*compiler_name != '\0' &&
389 (Arguments::mode() != Arguments::_int)) {
390 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
391 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
392 result_h->obj_at_put(ndx * 2, key_str());
393 result_h->obj_at_put(ndx * 2 + 1, value_str());
394 ndx++;
395 }
396 }
397
398 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
399 JVM_END
400
401
402 /*
403 * Return the temporary directory that the VM uses for the attach
404 * and perf data files.
405 *
406 * It is important that this directory is well-known and the
407 * same for all VM instances. It cannot be affected by configuration
408 * variables such as java.io.tmpdir.
409 */
410 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
411 HandleMark hm(THREAD);
412 const char* temp_dir = os::get_temp_directory();
413 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
414 return (jstring) JNIHandles::make_local(THREAD, h());
415 JVM_END
416
417 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
418 if (len < 0) {
419 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
420 }
421 elmClass->initialize(CHECK);
422 if (elmClass->is_array_klass() || elmClass->is_identity_class()) {
423 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
424 }
425 if (elmClass->is_abstract()) {
426 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
427 }
428 }
429
430 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
431 oop o = JNIHandles::resolve_non_null(orig);
432 assert(o->is_array(), "Must be");
433 oop array = nullptr;
434 arrayOop org = (arrayOop)o;
435 arrayHandle oh(THREAD, org);
436 ArrayKlass* ak = ArrayKlass::cast(org->klass());
437 InlineKlass* vk = InlineKlass::cast(ak->element_klass());
438 int len = to - from; // length of the new array
439 if (ak->is_null_free_array_klass()) {
440 if (from >= org->length() || to > org->length()) {
441 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
442 }
443 }
444 if (org->is_flatArray()) {
445 FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass());
446 LayoutKind lk = fak->layout_kind();
447 array = oopFactory::new_flatArray(vk, len, lk, CHECK_NULL);
448 arrayHandle ah(THREAD, (arrayOop)array);
449 int end = to < oh()->length() ? to : oh()->length();
450 for (int i = from; i < end; i++) {
451 void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper());
452 void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper());
453 vk->copy_payload_to_addr(src, dst, lk, false);
454 }
455 array = ah();
456 } else {
457 if (org->is_null_free_array()) {
458 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL);
459 } else {
460 array = oopFactory::new_objArray(vk, len, CHECK_NULL);
461 }
462 int end = to < oh()->length() ? to : oh()->length();
463 for (int i = from; i < end; i++) {
464 if (i < ((objArrayOop)oh())->length()) {
465 ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i));
466 } else {
467 assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
468 ((objArrayOop)array)->obj_at_put(i - from, nullptr);
469 }
470 }
471 }
472 return (jarray) JNIHandles::make_local(THREAD, array);
473 JVM_END
474
475 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
476 oop mirror = JNIHandles::resolve_non_null(elmClass);
477 oop init = JNIHandles::resolve(initVal);
478 if (init == nullptr) {
479 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
480 }
481 Handle init_h(THREAD, init);
482 Klass* klass = java_lang_Class::as_Klass(mirror);
483 if (klass != init_h()->klass()) {
484 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
485 }
486 validate_array_arguments(klass, len, CHECK_NULL);
487 InlineKlass* vk = InlineKlass::cast(klass);
488 oop array = nullptr;
489 if (vk->maybe_flat_in_array() && vk->has_non_atomic_layout()) {
490 array = oopFactory::new_flatArray(vk, len, LayoutKind::NON_ATOMIC_FLAT, CHECK_NULL);
491 for (int i = 0; i < len; i++) {
492 ((flatArrayOop)array)->write_value_to_flat_array(init_h(), i, CHECK_NULL);
493 }
494 } else {
495 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL);
496 for (int i = 0; i < len; i++) {
497 ((objArrayOop)array)->obj_at_put(i, init_h());
498 }
499 }
500 return (jarray) JNIHandles::make_local(THREAD, array);
501 JVM_END
502
503 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
504 oop mirror = JNIHandles::resolve_non_null(elmClass);
505 oop init = JNIHandles::resolve(initVal);
506 if (init == nullptr) {
507 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
508 }
509 Handle init_h(THREAD, init);
510 Klass* klass = java_lang_Class::as_Klass(mirror);
511 if (klass != init_h()->klass()) {
512 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
513 }
514 validate_array_arguments(klass, len, CHECK_NULL);
515 InlineKlass* vk = InlineKlass::cast(klass);
516 oop array = nullptr;
517 if (vk->maybe_flat_in_array() && vk->is_naturally_atomic() && vk->has_non_atomic_layout()) {
518 array = oopFactory::new_flatArray(vk, len, LayoutKind::NON_ATOMIC_FLAT, CHECK_NULL);
519 for (int i = 0; i < len; i++) {
520 ((flatArrayOop)array)->write_value_to_flat_array(init_h(), i, CHECK_NULL);
521 }
522 } else if (vk->maybe_flat_in_array() && vk->has_atomic_layout()) {
523 array = oopFactory::new_flatArray(vk, len, LayoutKind::ATOMIC_FLAT, CHECK_NULL);
524 for (int i = 0; i < len; i++) {
525 ((flatArrayOop)array)->write_value_to_flat_array(init_h(), i, CHECK_NULL);
526 }
527 } else {
528 array = oopFactory::new_null_free_objArray(vk, len, CHECK_NULL);
529 for (int i = 0; i < len; i++) {
530 // need a type check here
531
532 ((objArrayOop)array)->obj_at_put(i, init_h());
533 }
534 }
535 return (jarray) JNIHandles::make_local(THREAD, array);
536 JVM_END
537
538 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
539 oop mirror = JNIHandles::resolve_non_null(elmClass);
540 Klass* klass = java_lang_Class::as_Klass(mirror);
541 klass->initialize(CHECK_NULL);
542 validate_array_arguments(klass, len, CHECK_NULL);
543 InlineKlass* vk = InlineKlass::cast(klass);
544 oop array = nullptr;
545 if (vk->maybe_flat_in_array() && vk->has_nullable_atomic_layout()) {
546 array = oopFactory::new_flatArray(vk, len, LayoutKind::NULLABLE_ATOMIC_FLAT, CHECK_NULL);
547 } else {
548 array = oopFactory::new_objArray(vk, len, CHECK_NULL);
549 }
550 return (jarray) JNIHandles::make_local(THREAD, array);
551 JVM_END
552
553 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
554 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
555 return oop->is_flatArray();
556 JVM_END
557
558 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
559 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
560 return oop->is_null_free_array();
561 JVM_END
562
563 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
564 // There are multiple cases where an array can/must support atomic access:
565 // - the array is a reference array
566 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or ATOMIC_FLAT
567 // - the array is flat and its component type is naturally atomic
568 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
569 if (oop->is_objArray()) return true;
570 if (oop->is_flatArray()) {
571 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
572 if (fak->layout_kind() == LayoutKind::ATOMIC_FLAT || fak->layout_kind() == LayoutKind::NULLABLE_ATOMIC_FLAT) {
573 return true;
574 }
575 if (fak->element_klass()->is_naturally_atomic()) return true;
576 }
577 return false;
578 JVM_END
579
580 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
581
582 extern volatile jint vm_created;
583
584 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
585 EventShutdown event;
586 if (event.should_commit()) {
587 event.set_reason("Shutdown requested from Java");
588 event.commit();
589 }
590 JVM_END
591
592
593 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
594 before_exit(thread, true);
595 vm_exit(code);
596 JVM_END
597
598
599 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
600 if (!DisableExplicitGC) {
601 EventSystemGC event;
602 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
603 Universe::heap()->collect(GCCause::_java_lang_system_gc);
604 event.commit();
605 }
606 JVM_END
607
608
609 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
610 return Universe::heap()->millis_since_last_whole_heap_examined();
611 JVM_END
612
613
614 static inline jlong convert_size_t_to_jlong(size_t val) {
615 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
616 NOT_LP64 (return (jlong)val;)
617 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
618 }
619
620 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
621 size_t n = Universe::heap()->capacity();
622 return convert_size_t_to_jlong(n);
623 JVM_END
624
625
626 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
627 size_t n = Universe::heap()->unused();
628 return convert_size_t_to_jlong(n);
629 JVM_END
630
631
632 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
633 size_t n = Universe::heap()->max_capacity();
634 return convert_size_t_to_jlong(n);
635 JVM_END
636
637
638 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
639 return os::active_processor_count();
640 JVM_END
641
642 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
643 #ifdef LINUX
644 if (UseContainerSupport) {
645 return JNI_TRUE;
646 }
647 #endif
648 return JNI_FALSE;
649 JVM_END
650
651 JVM_LEAF(jboolean, JVM_IsContainerized(void))
652 #ifdef LINUX
653 if (OSContainer::is_containerized()) {
654 return JNI_TRUE;
655 }
656 #endif
657 return JNI_FALSE;
658 JVM_END
659
660 // java.lang.Throwable //////////////////////////////////////////////////////
661
662 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
663 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
664 java_lang_Throwable::fill_in_stack_trace(exception);
665 JVM_END
666
667 // java.lang.NullPointerException ///////////////////////////////////////////
668
669 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
670 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
671
672 oop exc = JNIHandles::resolve_non_null(throwable);
673
674 Method* method;
675 int bci;
676 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
677 return nullptr;
678 }
679 if (method->is_native()) {
680 return nullptr;
681 }
682
683 stringStream ss;
684 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
685 if (ok) {
686 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
687 return (jstring) JNIHandles::make_local(THREAD, result);
688 } else {
689 return nullptr;
690 }
691 JVM_END
692
693 // java.lang.StackTraceElement //////////////////////////////////////////////
694
695
696 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
697 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
698 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
699 objArrayHandle stack_trace(THREAD, st);
700 // Fill in the allocated stack trace
701 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
702 JVM_END
703
704
705 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
706 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
707 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
708 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
709 JVM_END
710
711
712 // java.lang.StackWalker //////////////////////////////////////////////////////
713 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
714 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
715
716 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
717 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
718 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
719 if (!have_name) {
720 oop name = StringTable::intern(method->name(), CHECK);
721 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
722 }
723 if (!have_type) {
724 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
725 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
726 }
727 JVM_END
728
729 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
730 jint skip_frames, jobject contScope, jobject cont,
731 jint buffer_size, jint start_index, jobjectArray frames))
732 if (!thread->has_last_Java_frame()) {
733 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
734 }
735
736 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
737 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
738 Handle cont_h(THREAD, JNIHandles::resolve(cont));
739 // frames array is a ClassFrameInfo[] array when only getting caller reference,
740 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
741 // be null.
742 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
743 objArrayHandle frames_array_h(THREAD, fa);
744
745 if (frames_array_h->length() < buffer_size) {
746 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
747 }
748
749 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
750 buffer_size, start_index, frames_array_h, CHECK_NULL);
751 return JNIHandles::make_local(THREAD, result);
752 JVM_END
753
754
755 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
756 jint last_batch_count, jint buffer_size, jint start_index,
757 jobjectArray frames))
758 // frames array is a ClassFrameInfo[] array when only getting caller reference,
759 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
760 // be null.
761 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
762 objArrayHandle frames_array_h(THREAD, fa);
763
764 if (frames_array_h->length() < buffer_size) {
765 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
766 }
767
768 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
769 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
770 start_index, frames_array_h, THREAD);
771 JVM_END
772
773 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
774 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
775 objArrayHandle frames_array_h(THREAD, fa);
776 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
777 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
778
779 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
780 JVM_END
781
782 // java.lang.Object ///////////////////////////////////////////////
783
784
785 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
786 // as implemented in the classic virtual machine; return 0 if object is null
787 if (handle == nullptr) {
788 return 0;
789 }
790 oop obj = JNIHandles::resolve_non_null(handle);
791 if (EnableValhalla && obj->klass()->is_inline_klass()) {
792 JavaValue result(T_INT);
793 JavaCallArguments args;
794 Handle ho(THREAD, obj);
795 args.push_oop(ho);
796 methodHandle method(THREAD, Universe::value_object_hash_code_method());
797 JavaCalls::call(&result, method, &args, THREAD);
798 if (HAS_PENDING_EXCEPTION) {
799 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
800 Handle e(THREAD, PENDING_EXCEPTION);
801 CLEAR_PENDING_EXCEPTION;
802 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
803 }
804 }
805 return result.get_jint();
806 } else {
807 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
808 }
809 JVM_END
810
811
812 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
813 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
814 ObjectSynchronizer::wait(obj, ms, CHECK);
815 JVM_END
816
817
818 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
819 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
820 ObjectSynchronizer::notify(obj, CHECK);
821 JVM_END
822
823
824 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
825 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
826 ObjectSynchronizer::notifyall(obj, CHECK);
827 JVM_END
828
829
830 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
831 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
832 Klass* klass = obj->klass();
833 JvmtiVMObjectAllocEventCollector oam;
834
835 #ifdef ASSERT
836 // Just checking that the cloneable flag is set correct
837 if (obj->is_array()) {
838 guarantee(klass->is_cloneable(), "all arrays are cloneable");
839 } else {
840 guarantee(obj->is_instance(), "should be instanceOop");
841 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
842 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
843 }
844 #endif
845
846 // Check if class of obj supports the Cloneable interface.
847 // All arrays are considered to be cloneable (See JLS 20.1.5).
848 // All j.l.r.Reference classes are considered non-cloneable.
849 if (!klass->is_cloneable() ||
850 (klass->is_instance_klass() &&
851 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
852 ResourceMark rm(THREAD);
853 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
854 }
855
856 if (klass->is_inline_klass()) {
857 // Value instances have no identity, so return the current instance instead of allocating a new one
858 // Value classes cannot have finalizers, so the method can return immediately
859 return JNIHandles::make_local(THREAD, obj());
860 }
861
862 // Make shallow object copy
863 const size_t size = obj->size();
864 oop new_obj_oop = nullptr;
865 if (obj->is_array()) {
866 const int length = ((arrayOop)obj())->length();
867 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
868 /* do_zero */ true, CHECK_NULL);
869 } else {
870 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
871 }
872
873 HeapAccess<>::clone(obj(), new_obj_oop, size);
874
875 Handle new_obj(THREAD, new_obj_oop);
876 // Caution: this involves a java upcall, so the clone should be
877 // "gc-robust" by this stage.
878 if (klass->has_finalizer()) {
879 assert(obj->is_instance(), "should be instanceOop");
880 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
881 new_obj = Handle(THREAD, new_obj_oop);
882 }
883
884 return JNIHandles::make_local(THREAD, new_obj());
885 JVM_END
886
887 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
888
889 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
890 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
891 JVM_END
892
893 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
894 return InstanceKlass::is_finalization_enabled();
895 JVM_END
896
897 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
898
899 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
900 CONT_RegisterNativeMethods(env, cls);
901 JVM_END
902
903 // java.io.File ///////////////////////////////////////////////////////////////
904
905 JVM_LEAF(char*, JVM_NativePath(char* path))
906 return os::native_path(path);
907 JVM_END
908
909
910 // Misc. class handling ///////////////////////////////////////////////////////////
911
912
913 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
914 // Getting the class of the caller frame.
915 //
916 // The call stack at this point looks something like this:
917 //
918 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
919 // [1] [ @CallerSensitive API.method ]
920 // [.] [ (skipped intermediate frames) ]
921 // [n] [ caller ]
922 vframeStream vfst(thread);
923 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
924 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
925 Method* m = vfst.method();
926 assert(m != nullptr, "sanity");
927 switch (n) {
928 case 0:
929 // This must only be called from Reflection.getCallerClass
930 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
931 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
932 }
933 // fall-through
934 case 1:
935 // Frame 0 and 1 must be caller sensitive.
936 if (!m->caller_sensitive()) {
937 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
938 }
939 break;
940 default:
941 if (!m->is_ignored_by_security_stack_walk()) {
942 // We have reached the desired frame; return the holder class.
943 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
944 }
945 break;
946 }
947 }
948 return nullptr;
949 JVM_END
950
951
952 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
953 oop mirror = nullptr;
954 BasicType t = name2type(utf);
955 if (t != T_ILLEGAL && !is_reference_type(t)) {
956 mirror = Universe::java_mirror(t);
957 }
958 if (mirror == nullptr) {
959 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
960 } else {
961 return (jclass) JNIHandles::make_local(THREAD, mirror);
962 }
963 JVM_END
964
965
966 // Returns a class loaded by the bootstrap class loader; or null
967 // if not found. ClassNotFoundException is not thrown.
968 // FindClassFromBootLoader is exported to the launcher for windows.
969 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
970 const char* name))
971 // Java libraries should ensure that name is never null or illegal.
972 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
973 // It's impossible to create this class; the name cannot fit
974 // into the constant pool.
975 return nullptr;
976 }
977 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
978
979 TempNewSymbol h_name = SymbolTable::new_symbol(name);
980 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
981 if (k == nullptr) {
982 return nullptr;
983 }
984
985 if (log_is_enabled(Debug, class, resolve)) {
986 trace_class_resolution(k);
987 }
988 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
989 JVM_END
990
991 // Find a class with this name in this loader, using the caller's protection domain.
992 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
993 jboolean init, jobject loader,
994 jclass caller))
995 TempNewSymbol h_name =
996 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
997 CHECK_NULL);
998
999 oop loader_oop = JNIHandles::resolve(loader);
1000 oop from_class = JNIHandles::resolve(caller);
1001 Handle h_loader(THREAD, loader_oop);
1002
1003 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1004 false, THREAD);
1005
1006 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1007 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1008 }
1009 return result;
1010 JVM_END
1011
1012 // Currently only called from the old verifier.
1013 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1014 jboolean init, jclass from))
1015 TempNewSymbol h_name =
1016 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1017 CHECK_NULL);
1018 oop from_class_oop = JNIHandles::resolve(from);
1019 Klass* from_class = (from_class_oop == nullptr)
1020 ? (Klass*)nullptr
1021 : java_lang_Class::as_Klass(from_class_oop);
1022 oop class_loader = nullptr;
1023 if (from_class != nullptr) {
1024 class_loader = from_class->class_loader();
1025 }
1026 Handle h_loader(THREAD, class_loader);
1027 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1028
1029 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1030 // this function is generally only used for class loading during verification.
1031 ResourceMark rm;
1032 oop from_mirror = JNIHandles::resolve_non_null(from);
1033 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
1034 const char * from_name = from_class->external_name();
1035
1036 oop mirror = JNIHandles::resolve_non_null(result);
1037 Klass* to_class = java_lang_Class::as_Klass(mirror);
1038 const char * to = to_class->external_name();
1039 log_debug(class, resolve)("%s %s (verification)", from_name, to);
1040 }
1041
1042 return result;
1043 JVM_END
1044
1045 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1046 static jclass jvm_define_class_common(const char *name,
1047 jobject loader, const jbyte *buf,
1048 jsize len, jobject pd, const char *source,
1049 TRAPS) {
1050 if (source == nullptr) source = "__JVM_DefineClass__";
1051
1052 JavaThread* jt = THREAD;
1053
1054 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1055 ClassLoader::perf_define_appclass_selftime(),
1056 ClassLoader::perf_define_appclasses(),
1057 jt->get_thread_stat()->perf_recursion_counts_addr(),
1058 jt->get_thread_stat()->perf_timers_addr(),
1059 PerfClassTraceTime::DEFINE_CLASS);
1060
1061 if (UsePerfData) {
1062 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1063 }
1064
1065 // Class resolution will get the class name from the .class stream if the name is null.
1066 TempNewSymbol class_name = name == nullptr ? nullptr :
1067 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1068 CHECK_NULL);
1069
1070 ResourceMark rm(THREAD);
1071 ClassFileStream st((u1*)buf, len, source);
1072 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1073 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1074 ClassLoadInfo cl_info(protection_domain);
1075 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1076 class_loader,
1077 cl_info,
1078 CHECK_NULL);
1079
1080 if (log_is_enabled(Debug, class, resolve)) {
1081 trace_class_resolution(k);
1082 }
1083
1084 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1085 }
1086
1087 enum {
1088 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1089 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1090 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1091 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1092 };
1093
1094 /*
1095 * Define a class with the specified flags that indicates if it's a nestmate,
1096 * hidden, or strongly referenced from class loader.
1097 */
1098 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1099 const jbyte *buf, jsize len, jobject pd,
1100 jboolean init, int flags, jobject classData, TRAPS) {
1101 ResourceMark rm(THREAD);
1102
1103 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
1104 // Lookup class must be a non-null instance
1105 if (lookup_k == nullptr) {
1106 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1107 }
1108 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
1109
1110 Handle class_loader (THREAD, lookup_k->class_loader());
1111
1112 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1113 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1114 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1115 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1116
1117 InstanceKlass* host_class = nullptr;
1118 if (is_nestmate) {
1119 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1120 }
1121
1122 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1123 name,
1124 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1125 is_nestmate ? host_class->external_name() : "",
1126 is_hidden ? "hidden" : "not hidden",
1127 is_strong ? "strong" : "weak",
1128 vm_annotations ? "with vm annotations" : "without vm annotation");
1129
1130 if (!is_hidden) {
1131 // classData is only applicable for hidden classes
1132 if (classData != nullptr) {
1133 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1134 }
1135 if (is_nestmate) {
1136 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1137 }
1138 if (!is_strong) {
1139 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1140 }
1141 if (vm_annotations) {
1142 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1143 }
1144 if (flags != STRONG_LOADER_LINK) {
1145 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1146 err_msg("invalid flag 0x%x", flags));
1147 }
1148 }
1149
1150 // Class resolution will get the class name from the .class stream if the name is null.
1151 TempNewSymbol class_name = name == nullptr ? nullptr :
1152 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1153 CHECK_NULL);
1154
1155 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1156 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1157 ClassFileStream st((u1*)buf, len, source);
1158
1159 InstanceKlass* ik = nullptr;
1160 if (!is_hidden) {
1161 ClassLoadInfo cl_info(protection_domain);
1162 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1163 class_loader,
1164 cl_info,
1165 CHECK_NULL);
1166
1167 if (log_is_enabled(Debug, class, resolve)) {
1168 trace_class_resolution(ik);
1169 }
1170 } else { // hidden
1171 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1172 ClassLoadInfo cl_info(protection_domain,
1173 host_class,
1174 classData_h,
1175 is_hidden,
1176 is_strong,
1177 vm_annotations);
1178 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1179 class_loader,
1180 cl_info,
1181 CHECK_NULL);
1182
1183 // The hidden class loader data has been artificially been kept alive to
1184 // this point. The mirror and any instances of this class have to keep
1185 // it alive afterwards.
1186 ik->class_loader_data()->dec_keep_alive_ref_count();
1187
1188 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1189 ModuleEntry* module = ik->module();
1190 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1191 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1192 module_name,
1193 ik->external_name(),
1194 host_class->external_name(),
1195 ik->is_hidden() ? "is hidden" : "is not hidden");
1196 }
1197 }
1198
1199 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1200 // non-hidden class or nestmate class must be in the same package as the Lookup class
1201 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1202 }
1203
1204 if (init) {
1205 ik->initialize(CHECK_NULL);
1206 } else {
1207 ik->link_class(CHECK_NULL);
1208 }
1209
1210 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1211 }
1212
1213 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1214 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1215 JVM_END
1216
1217 /*
1218 * Define a class with the specified lookup class.
1219 * lookup: Lookup class
1220 * name: the name of the class
1221 * buf: class bytes
1222 * len: length of class bytes
1223 * pd: protection domain
1224 * init: initialize the class
1225 * flags: properties of the class
1226 * classData: private static pre-initialized field
1227 */
1228 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1229 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1230
1231 if (lookup == nullptr) {
1232 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1233 }
1234
1235 assert(buf != nullptr, "buf must not be null");
1236
1237 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1238 JVM_END
1239
1240 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1241
1242 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1243 JVM_END
1244
1245 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1246 ResourceMark rm(THREAD);
1247
1248 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1249 char* str = java_lang_String::as_utf8_string(h_name());
1250
1251 // Sanity check, don't expect null
1252 if (str == nullptr) return nullptr;
1253
1254 // Internalize the string, converting '.' to '/' in string.
1255 char* p = (char*)str;
1256 while (*p != '\0') {
1257 if (*p == '.') {
1258 *p = '/';
1259 }
1260 p++;
1261 }
1262
1263 const int str_len = (int)(p - str);
1264 if (str_len > Symbol::max_length()) {
1265 // It's impossible to create this class; the name cannot fit
1266 // into the constant pool.
1267 return nullptr;
1268 }
1269 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1270
1271 // Security Note:
1272 // The Java level wrapper will perform the necessary security check allowing
1273 // us to pass the null as the initiating class loader.
1274 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1275 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1276 #if INCLUDE_CDS
1277 if (k == nullptr) {
1278 // If the class is not already loaded, try to see if it's in the shared
1279 // archive for the current classloader (h_loader).
1280 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1281 }
1282 #endif
1283 return (k == nullptr) ? nullptr :
1284 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1285 JVM_END
1286
1287 // Module support //////////////////////////////////////////////////////////////////////////////
1288
1289 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1290 jstring location, jobjectArray packages))
1291 Handle h_module (THREAD, JNIHandles::resolve(module));
1292 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1293 JVM_END
1294
1295 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1296 Handle h_module (THREAD, JNIHandles::resolve(module));
1297 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1298 JVM_END
1299
1300 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1301 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1302 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1303 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1304 JVM_END
1305
1306 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1307 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1308 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1309 JVM_END
1310
1311 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1312 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1313 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1314 JVM_END
1315
1316 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1317 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1318 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1319 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1320 JVM_END
1321
1322 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1323 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1324 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1325 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1326 JVM_END
1327
1328 // Reflection support //////////////////////////////////////////////////////////////////////////////
1329
1330 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1331 assert (cls != nullptr, "illegal class");
1332 JvmtiVMObjectAllocEventCollector oam;
1333 ResourceMark rm(THREAD);
1334 HandleMark hm(THREAD);
1335 Handle java_class(THREAD, JNIHandles::resolve(cls));
1336 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1337 return (jstring) JNIHandles::make_local(THREAD, result);
1338 JVM_END
1339
1340
1341 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1342 JvmtiVMObjectAllocEventCollector oam;
1343 oop mirror = JNIHandles::resolve_non_null(cls);
1344
1345 // Special handling for primitive objects
1346 if (java_lang_Class::is_primitive(mirror)) {
1347 // Primitive objects does not have any interfaces
1348 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1349 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1350 }
1351
1352 Klass* klass = java_lang_Class::as_Klass(mirror);
1353 // Figure size of result array
1354 int size;
1355 if (klass->is_instance_klass()) {
1356 InstanceKlass* ik = InstanceKlass::cast(klass);
1357 size = ik->local_interfaces()->length();
1358 } else {
1359 assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass");
1360 size = 2;
1361 }
1362
1363 // Allocate result array
1364 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1365 objArrayHandle result (THREAD, r);
1366 // Fill in result
1367 if (klass->is_instance_klass()) {
1368 // Regular instance klass, fill in all local interfaces
1369 for (int index = 0; index < size; index++) {
1370 InstanceKlass* ik = InstanceKlass::cast(klass);
1371 Klass* k = ik->local_interfaces()->at(index);
1372 result->obj_at_put(index, k->java_mirror());
1373 }
1374 } else {
1375 // All arrays implement java.lang.Cloneable and java.io.Serializable
1376 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1377 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1378 }
1379 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1380 JVM_END
1381
1382
1383 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1384 oop mirror = JNIHandles::resolve_non_null(cls);
1385 if (java_lang_Class::is_primitive(mirror)) {
1386 return JNI_FALSE;
1387 }
1388 Klass* k = java_lang_Class::as_Klass(mirror);
1389 return k->is_hidden();
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(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1441 JvmtiVMObjectAllocEventCollector oam;
1442 // ofClass is a reference to a java_lang_Class object. The mirror object
1443 // of an InstanceKlass
1444 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1445 if (java_lang_Class::is_primitive(ofMirror) ||
1446 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1447 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1448 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1449 }
1450
1451 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1452 InnerClassesIterator iter(k);
1453
1454 if (iter.length() == 0) {
1455 // Neither an inner nor outer class
1456 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1457 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1458 }
1459
1460 // find inner class info
1461 constantPoolHandle cp(thread, k->constants());
1462 int length = iter.length();
1463
1464 // Allocate temp. result array
1465 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1466 objArrayHandle result (THREAD, r);
1467 int members = 0;
1468
1469 for (; !iter.done(); iter.next()) {
1470 int ioff = iter.inner_class_info_index();
1471 int ooff = iter.outer_class_info_index();
1472
1473 if (ioff != 0 && ooff != 0) {
1474 // Check to see if the name matches the class we're looking for
1475 // before attempting to find the class.
1476 if (cp->klass_name_at_matches(k, ooff)) {
1477 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1478 if (outer_klass == k) {
1479 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1480 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1481
1482 // Throws an exception if outer klass has not declared k as
1483 // an inner klass
1484 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1485
1486 result->obj_at_put(members, inner_klass->java_mirror());
1487 members++;
1488 }
1489 }
1490 }
1491 }
1492
1493 if (members != length) {
1494 // Return array of right length
1495 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1496 for(int i = 0; i < members; i++) {
1497 res->obj_at_put(i, result->obj_at(i));
1498 }
1499 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1500 }
1501
1502 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1503 JVM_END
1504
1505
1506 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1507 {
1508 // ofClass is a reference to a java_lang_Class object.
1509 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1510 if (java_lang_Class::is_primitive(ofMirror)) {
1511 return nullptr;
1512 }
1513 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1514 if (!klass->is_instance_klass()) {
1515 return nullptr;
1516 }
1517
1518 bool inner_is_member = false;
1519 Klass* outer_klass
1520 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1521 if (outer_klass == nullptr) return nullptr; // already a top-level class
1522 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1523 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1524 }
1525 JVM_END
1526
1527 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1528 {
1529 oop mirror = JNIHandles::resolve_non_null(cls);
1530 if (java_lang_Class::is_primitive(mirror)) {
1531 return nullptr;
1532 }
1533 Klass* klass = java_lang_Class::as_Klass(mirror);
1534 if (!klass->is_instance_klass()) {
1535 return nullptr;
1536 }
1537 InstanceKlass* k = InstanceKlass::cast(klass);
1538 int ooff = 0, noff = 0;
1539 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1540 if (noff != 0) {
1541 constantPoolHandle i_cp(thread, k->constants());
1542 Symbol* name = i_cp->symbol_at(noff);
1543 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1544 return (jstring) JNIHandles::make_local(THREAD, str());
1545 }
1546 }
1547 return nullptr;
1548 }
1549 JVM_END
1550
1551 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1552 assert (cls != nullptr, "illegal class");
1553 JvmtiVMObjectAllocEventCollector oam;
1554 ResourceMark rm(THREAD);
1555 oop mirror = JNIHandles::resolve_non_null(cls);
1556 // Return null for arrays and primitives
1557 if (!java_lang_Class::is_primitive(mirror)) {
1558 Klass* k = java_lang_Class::as_Klass(mirror);
1559 if (k->is_instance_klass()) {
1560 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1561 if (sym == nullptr) return nullptr;
1562 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1563 return (jstring) JNIHandles::make_local(THREAD, str());
1564 }
1565 }
1566 return nullptr;
1567 JVM_END
1568
1569
1570 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1571 assert (cls != nullptr, "illegal class");
1572 oop mirror = JNIHandles::resolve_non_null(cls);
1573 // Return null for arrays and primitives
1574 if (!java_lang_Class::is_primitive(mirror)) {
1575 Klass* k = java_lang_Class::as_Klass(mirror);
1576 if (k->is_instance_klass()) {
1577 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1578 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1579 }
1580 }
1581 return nullptr;
1582 JVM_END
1583
1584
1585 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1586 // some of this code was adapted from from jni_FromReflectedField
1587
1588 oop reflected = JNIHandles::resolve_non_null(field);
1589 oop mirror = java_lang_reflect_Field::clazz(reflected);
1590 Klass* k = java_lang_Class::as_Klass(mirror);
1591 int slot = java_lang_reflect_Field::slot(reflected);
1592 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1593
1594 InstanceKlass* ik = InstanceKlass::cast(k);
1595 int offset = ik->field_offset(slot);
1596
1597 if (modifiers & JVM_ACC_STATIC) {
1598 // for static fields we only look in the current class
1599 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1600 assert(false, "cannot find static field");
1601 return false;
1602 }
1603 } else {
1604 // for instance fields we start with the current class and work
1605 // our way up through the superclass chain
1606 if (!ik->find_field_from_offset(offset, false, &fd)) {
1607 assert(false, "cannot find instance field");
1608 return false;
1609 }
1610 }
1611 return true;
1612 }
1613
1614 static Method* jvm_get_method_common(jobject method) {
1615 // some of this code was adapted from from jni_FromReflectedMethod
1616
1617 oop reflected = JNIHandles::resolve_non_null(method);
1618 oop mirror = nullptr;
1619 int slot = 0;
1620
1621 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1622 mirror = java_lang_reflect_Constructor::clazz(reflected);
1623 slot = java_lang_reflect_Constructor::slot(reflected);
1624 } else {
1625 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1626 "wrong type");
1627 mirror = java_lang_reflect_Method::clazz(reflected);
1628 slot = java_lang_reflect_Method::slot(reflected);
1629 }
1630 Klass* k = java_lang_Class::as_Klass(mirror);
1631
1632 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1633 assert(m != nullptr, "cannot find method");
1634 return m; // caller has to deal with null in product mode
1635 }
1636
1637 /* Type use annotations support (JDK 1.8) */
1638
1639 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1640 assert (cls != nullptr, "illegal class");
1641 ResourceMark rm(THREAD);
1642 // Return null for arrays and primitives
1643 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1644 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1645 if (k->is_instance_klass()) {
1646 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1647 if (type_annotations != nullptr) {
1648 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1649 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1650 }
1651 }
1652 }
1653 return nullptr;
1654 JVM_END
1655
1656 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1657 assert (method != nullptr, "illegal method");
1658 // method is a handle to a java.lang.reflect.Method object
1659 Method* m = jvm_get_method_common(method);
1660 if (m == nullptr) {
1661 return nullptr;
1662 }
1663
1664 AnnotationArray* type_annotations = m->type_annotations();
1665 if (type_annotations != nullptr) {
1666 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1667 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1668 }
1669
1670 return nullptr;
1671 JVM_END
1672
1673 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1674 assert (field != nullptr, "illegal field");
1675 fieldDescriptor fd;
1676 bool gotFd = jvm_get_field_common(field, fd);
1677 if (!gotFd) {
1678 return nullptr;
1679 }
1680
1681 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1682 JVM_END
1683
1684 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1685 if (!cp->is_within_bounds(index)) {
1686 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1687 }
1688 }
1689
1690 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1691 {
1692 // method is a handle to a java.lang.reflect.Method object
1693 Method* method_ptr = jvm_get_method_common(method);
1694 methodHandle mh (THREAD, method_ptr);
1695 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1696 const int num_params = mh->method_parameters_length();
1697
1698 if (num_params < 0) {
1699 // A -1 return value from method_parameters_length means there is no
1700 // parameter data. Return null to indicate this to the reflection
1701 // API.
1702 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1703 return (jobjectArray)nullptr;
1704 } else {
1705 // Otherwise, we return something up to reflection, even if it is
1706 // a zero-length array. Why? Because in some cases this can
1707 // trigger a MalformedParametersException.
1708
1709 // make sure all the symbols are properly formatted
1710 for (int i = 0; i < num_params; i++) {
1711 MethodParametersElement* params = mh->method_parameters_start();
1712 int index = params[i].name_cp_index;
1713 constantPoolHandle cp(THREAD, mh->constants());
1714 bounds_check(cp, index, CHECK_NULL);
1715
1716 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1717 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1718 "Wrong type at constant pool index");
1719 }
1720
1721 }
1722
1723 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1724 objArrayHandle result (THREAD, result_oop);
1725
1726 for (int i = 0; i < num_params; i++) {
1727 MethodParametersElement* params = mh->method_parameters_start();
1728 // For a 0 index, give a null symbol
1729 Symbol* sym = 0 != params[i].name_cp_index ?
1730 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1731 int flags = params[i].flags;
1732 oop param = Reflection::new_parameter(reflected_method, i, sym,
1733 flags, CHECK_NULL);
1734 result->obj_at_put(i, param);
1735 }
1736 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1737 }
1738 }
1739 JVM_END
1740
1741 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1742
1743 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1744 {
1745 JvmtiVMObjectAllocEventCollector oam;
1746
1747 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1748 // Exclude primitive types and array types
1749 if (java_lang_Class::is_primitive(ofMirror) ||
1750 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1751 // Return empty array
1752 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1753 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1754 }
1755
1756 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1757 constantPoolHandle cp(THREAD, k->constants());
1758
1759 // Ensure class is linked
1760 k->link_class(CHECK_NULL);
1761
1762 // Allocate result
1763 int num_fields;
1764
1765 if (publicOnly) {
1766 num_fields = 0;
1767 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1768 if (fs.access_flags().is_public()) ++num_fields;
1769 }
1770 } else {
1771 num_fields = k->java_fields_count();
1772 }
1773
1774 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1775 objArrayHandle result (THREAD, r);
1776
1777 int out_idx = 0;
1778 fieldDescriptor fd;
1779 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1780 if (!publicOnly || fs.access_flags().is_public()) {
1781 fd.reinitialize(k, fs.to_FieldInfo());
1782 oop field = Reflection::new_field(&fd, CHECK_NULL);
1783 result->obj_at_put(out_idx, field);
1784 ++out_idx;
1785 }
1786 }
1787 assert(out_idx == num_fields, "just checking");
1788 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1789 }
1790 JVM_END
1791
1792 // A class is a record if and only if it is final and a direct subclass of
1793 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1794 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1795 {
1796 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1797 if (k != nullptr && k->is_instance_klass()) {
1798 InstanceKlass* ik = InstanceKlass::cast(k);
1799 return ik->is_record();
1800 } else {
1801 return false;
1802 }
1803 }
1804 JVM_END
1805
1806 // Returns an array containing the components of the Record attribute,
1807 // or null if the attribute is not present.
1808 //
1809 // Note that this function returns the components of the Record attribute
1810 // even if the class is not a record.
1811 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1812 {
1813 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1814 assert(c->is_instance_klass(), "must be");
1815 InstanceKlass* ik = InstanceKlass::cast(c);
1816
1817 Array<RecordComponent*>* components = ik->record_components();
1818 if (components != nullptr) {
1819 JvmtiVMObjectAllocEventCollector oam;
1820 constantPoolHandle cp(THREAD, ik->constants());
1821 int length = components->length();
1822 assert(length >= 0, "unexpected record_components length");
1823 objArrayOop record_components =
1824 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1825 objArrayHandle components_h (THREAD, record_components);
1826
1827 for (int x = 0; x < length; x++) {
1828 RecordComponent* component = components->at(x);
1829 assert(component != nullptr, "unexpected null record component");
1830 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1831 components_h->obj_at_put(x, component_oop);
1832 }
1833 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1834 }
1835
1836 return nullptr;
1837 }
1838 JVM_END
1839
1840 static jobjectArray get_class_declared_methods_helper(
1841 JNIEnv *env,
1842 jclass ofClass, jboolean publicOnly,
1843 bool want_constructor,
1844 Klass* klass, TRAPS) {
1845
1846 JvmtiVMObjectAllocEventCollector oam;
1847
1848 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1849 // Exclude primitive types and array types
1850 if (java_lang_Class::is_primitive(ofMirror)
1851 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1852 // Return empty array
1853 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1854 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1855 }
1856
1857 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1858
1859 // Ensure class is linked
1860 k->link_class(CHECK_NULL);
1861
1862 Array<Method*>* methods = k->methods();
1863 int methods_length = methods->length();
1864
1865 // Save original method_idnum in case of redefinition, which can change
1866 // the idnum of obsolete methods. The new method will have the same idnum
1867 // but if we refresh the methods array, the counts will be wrong.
1868 ResourceMark rm(THREAD);
1869 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1870 int num_methods = 0;
1871
1872 // Select methods matching the criteria.
1873 for (int i = 0; i < methods_length; i++) {
1874 Method* method = methods->at(i);
1875 if (want_constructor && !method->is_object_constructor()) {
1876 continue;
1877 }
1878 if (!want_constructor &&
1879 (method->is_object_constructor() || method->is_class_initializer() ||
1880 method->is_overpass())) {
1881 continue;
1882 }
1883 if (publicOnly && !method->is_public()) {
1884 continue;
1885 }
1886 idnums->push(method->method_idnum());
1887 ++num_methods;
1888 }
1889
1890 // Allocate result
1891 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1892 objArrayHandle result (THREAD, r);
1893
1894 // Now just put the methods that we selected above, but go by their idnum
1895 // in case of redefinition. The methods can be redefined at any safepoint,
1896 // so above when allocating the oop array and below when creating reflect
1897 // objects.
1898 for (int i = 0; i < num_methods; i++) {
1899 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1900 if (method.is_null()) {
1901 // Method may have been deleted and seems this API can handle null
1902 // Otherwise should probably put a method that throws NSME
1903 result->obj_at_put(i, nullptr);
1904 } else {
1905 oop m;
1906 if (want_constructor) {
1907 assert(method->is_object_constructor(), "must be");
1908 m = Reflection::new_constructor(method, CHECK_NULL);
1909 } else {
1910 m = Reflection::new_method(method, false, CHECK_NULL);
1911 }
1912 result->obj_at_put(i, m);
1913 }
1914 }
1915
1916 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1917 }
1918
1919 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1920 {
1921 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1922 /*want_constructor*/ false,
1923 vmClasses::reflect_Method_klass(), THREAD);
1924 }
1925 JVM_END
1926
1927 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1928 {
1929 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1930 /*want_constructor*/ true,
1931 vmClasses::reflect_Constructor_klass(), THREAD);
1932 }
1933 JVM_END
1934
1935 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1936 {
1937 oop mirror = JNIHandles::resolve_non_null(cls);
1938 if (java_lang_Class::is_primitive(mirror)) {
1939 // Primitive type
1940 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1941 }
1942
1943 Klass* k = java_lang_Class::as_Klass(mirror);
1944 return k->access_flags().as_class_flags();
1945 }
1946 JVM_END
1947
1948 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1949 {
1950 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1951 assert(c->is_instance_klass(), "must be");
1952 InstanceKlass* ck = InstanceKlass::cast(c);
1953 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1954 assert(m->is_instance_klass(), "must be");
1955 InstanceKlass* mk = InstanceKlass::cast(m);
1956 return ck->has_nestmate_access_to(mk, THREAD);
1957 }
1958 JVM_END
1959
1960 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1961 {
1962 // current is not a primitive or array class
1963 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1964 assert(c->is_instance_klass(), "must be");
1965 InstanceKlass* ck = InstanceKlass::cast(c);
1966 InstanceKlass* host = ck->nest_host(THREAD);
1967 return (jclass) (host == nullptr ? nullptr :
1968 JNIHandles::make_local(THREAD, host->java_mirror()));
1969 }
1970 JVM_END
1971
1972 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1973 {
1974 // current is not a primitive or array class
1975 ResourceMark rm(THREAD);
1976 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1977 assert(c->is_instance_klass(), "must be");
1978 InstanceKlass* ck = InstanceKlass::cast(c);
1979 InstanceKlass* host = ck->nest_host(THREAD);
1980
1981 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1982 ck->external_name(), host->external_name());
1983 {
1984 JvmtiVMObjectAllocEventCollector oam;
1985 Array<u2>* members = host->nest_members();
1986 int length = members == nullptr ? 0 : members->length();
1987
1988 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1989
1990 // nest host is first in the array so make it one bigger
1991 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1992 length + 1, CHECK_NULL);
1993 objArrayHandle result(THREAD, r);
1994 result->obj_at_put(0, host->java_mirror());
1995 if (length != 0) {
1996 int count = 0;
1997 for (int i = 0; i < length; i++) {
1998 int cp_index = members->at(i);
1999 Klass* k = host->constants()->klass_at(cp_index, THREAD);
2000 if (HAS_PENDING_EXCEPTION) {
2001 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2002 return nullptr; // propagate VMEs
2003 }
2004 if (log_is_enabled(Trace, class, nestmates)) {
2005 stringStream ss;
2006 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2007 ss.print(" - resolution of nest member %s failed: ", target_member_class);
2008 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2009 log_trace(class, nestmates)("%s", ss.as_string());
2010 }
2011 CLEAR_PENDING_EXCEPTION;
2012 continue;
2013 }
2014 if (k->is_instance_klass()) {
2015 InstanceKlass* ik = InstanceKlass::cast(k);
2016 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2017 if (nest_host_k == host) {
2018 result->obj_at_put(count+1, k->java_mirror());
2019 count++;
2020 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2021 } else {
2022 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2023 ik->external_name(), nest_host_k->external_name());
2024 }
2025 } else {
2026 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2027 k->external_name());
2028 }
2029 }
2030 if (count < length) {
2031 // we had invalid entries so we need to compact the array
2032 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2033 length + 1, count + 1);
2034
2035 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2036 count + 1, CHECK_NULL);
2037 objArrayHandle result2(THREAD, r2);
2038 for (int i = 0; i < count + 1; i++) {
2039 result2->obj_at_put(i, result->obj_at(i));
2040 }
2041 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2042 }
2043 }
2044 else {
2045 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2046 }
2047 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2048 }
2049 }
2050 JVM_END
2051
2052 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2053 {
2054 oop mirror = JNIHandles::resolve_non_null(current);
2055 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2056 Klass* c = java_lang_Class::as_Klass(mirror);
2057 assert(c->is_instance_klass(), "must be");
2058 InstanceKlass* ik = InstanceKlass::cast(c);
2059 ResourceMark rm(THREAD);
2060 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2061 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2062 if (ik->is_sealed()) {
2063 JvmtiVMObjectAllocEventCollector oam;
2064 Array<u2>* subclasses = ik->permitted_subclasses();
2065 int length = subclasses->length();
2066
2067 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2068
2069 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2070 length, CHECK_NULL);
2071 objArrayHandle result(THREAD, r);
2072 int count = 0;
2073 for (int i = 0; i < length; i++) {
2074 int cp_index = subclasses->at(i);
2075 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2076 if (HAS_PENDING_EXCEPTION) {
2077 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2078 return nullptr; // propagate VMEs
2079 }
2080 if (log_is_enabled(Trace, class, sealed)) {
2081 stringStream ss;
2082 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2083 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2084 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2085 log_trace(class, sealed)("%s", ss.as_string());
2086 }
2087
2088 CLEAR_PENDING_EXCEPTION;
2089 continue;
2090 }
2091 if (k->is_instance_klass()) {
2092 result->obj_at_put(count++, k->java_mirror());
2093 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2094 }
2095 }
2096 if (count < length) {
2097 // we had invalid entries so we need to compact the array
2098 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2099 count, CHECK_NULL);
2100 objArrayHandle result2(THREAD, r2);
2101 for (int i = 0; i < count; i++) {
2102 result2->obj_at_put(i, result->obj_at(i));
2103 }
2104 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2105 }
2106 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2107 } else {
2108 return nullptr;
2109 }
2110 }
2111 JVM_END
2112
2113 // Constant pool access //////////////////////////////////////////////////////////
2114
2115 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2116 {
2117 JvmtiVMObjectAllocEventCollector oam;
2118 oop mirror = JNIHandles::resolve_non_null(cls);
2119 // Return null for primitives and arrays
2120 if (!java_lang_Class::is_primitive(mirror)) {
2121 Klass* k = java_lang_Class::as_Klass(mirror);
2122 if (k->is_instance_klass()) {
2123 InstanceKlass* k_h = InstanceKlass::cast(k);
2124 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2125 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2126 return JNIHandles::make_local(THREAD, jcp());
2127 }
2128 }
2129 return nullptr;
2130 }
2131 JVM_END
2132
2133
2134 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2135 {
2136 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2137 return cp->length();
2138 }
2139 JVM_END
2140
2141
2142 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2143 {
2144 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2145 bounds_check(cp, index, CHECK_NULL);
2146 constantTag tag = cp->tag_at(index);
2147 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2148 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2149 }
2150 Klass* k = cp->klass_at(index, CHECK_NULL);
2151 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2152 }
2153 JVM_END
2154
2155 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2156 {
2157 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2158 bounds_check(cp, index, CHECK_NULL);
2159 constantTag tag = cp->tag_at(index);
2160 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2161 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2162 }
2163 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2164 if (k == nullptr) return nullptr;
2165 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2166 }
2167 JVM_END
2168
2169 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2170 constantTag tag = cp->tag_at(index);
2171 if (!tag.is_method() && !tag.is_interface_method()) {
2172 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2173 }
2174 int klass_ref = cp->uncached_klass_ref_index_at(index);
2175 Klass* k_o;
2176 if (force_resolution) {
2177 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2178 } else {
2179 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2180 if (k_o == nullptr) return nullptr;
2181 }
2182 InstanceKlass* k = InstanceKlass::cast(k_o);
2183 Symbol* name = cp->uncached_name_ref_at(index);
2184 Symbol* sig = cp->uncached_signature_ref_at(index);
2185 methodHandle m (THREAD, k->find_method(name, sig));
2186 if (m.is_null()) {
2187 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2188 }
2189 oop method;
2190 if (m->is_object_constructor()) {
2191 method = Reflection::new_constructor(m, CHECK_NULL);
2192 } else {
2193 method = Reflection::new_method(m, true, CHECK_NULL);
2194 }
2195 return JNIHandles::make_local(THREAD, method);
2196 }
2197
2198 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2199 {
2200 JvmtiVMObjectAllocEventCollector oam;
2201 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2202 bounds_check(cp, index, CHECK_NULL);
2203 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2204 return res;
2205 }
2206 JVM_END
2207
2208 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2209 {
2210 JvmtiVMObjectAllocEventCollector oam;
2211 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2212 bounds_check(cp, index, CHECK_NULL);
2213 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2214 return res;
2215 }
2216 JVM_END
2217
2218 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2219 constantTag tag = cp->tag_at(index);
2220 if (!tag.is_field()) {
2221 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2222 }
2223 int klass_ref = cp->uncached_klass_ref_index_at(index);
2224 Klass* k_o;
2225 if (force_resolution) {
2226 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2227 } else {
2228 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2229 if (k_o == nullptr) return nullptr;
2230 }
2231 InstanceKlass* k = InstanceKlass::cast(k_o);
2232 Symbol* name = cp->uncached_name_ref_at(index);
2233 Symbol* sig = cp->uncached_signature_ref_at(index);
2234 fieldDescriptor fd;
2235 Klass* target_klass = k->find_field(name, sig, &fd);
2236 if (target_klass == nullptr) {
2237 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2238 }
2239 oop field = Reflection::new_field(&fd, CHECK_NULL);
2240 return JNIHandles::make_local(THREAD, field);
2241 }
2242
2243 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2244 {
2245 JvmtiVMObjectAllocEventCollector oam;
2246 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2247 bounds_check(cp, index, CHECK_NULL);
2248 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2249 return res;
2250 }
2251 JVM_END
2252
2253 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2254 {
2255 JvmtiVMObjectAllocEventCollector oam;
2256 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2257 bounds_check(cp, index, CHECK_NULL);
2258 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2259 return res;
2260 }
2261 JVM_END
2262
2263 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2264 {
2265 JvmtiVMObjectAllocEventCollector oam;
2266 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2267 bounds_check(cp, index, CHECK_NULL);
2268 constantTag tag = cp->tag_at(index);
2269 if (!tag.is_field_or_method()) {
2270 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2271 }
2272 int klass_ref = cp->uncached_klass_ref_index_at(index);
2273 Symbol* klass_name = cp->klass_name_at(klass_ref);
2274 Symbol* member_name = cp->uncached_name_ref_at(index);
2275 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2276 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2277 objArrayHandle dest(THREAD, dest_o);
2278 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2279 dest->obj_at_put(0, str());
2280 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2281 dest->obj_at_put(1, str());
2282 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2283 dest->obj_at_put(2, str());
2284 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2285 }
2286 JVM_END
2287
2288 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2289 {
2290 JvmtiVMObjectAllocEventCollector oam;
2291 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2292 bounds_check(cp, index, CHECK_0);
2293 constantTag tag = cp->tag_at(index);
2294 if (!tag.is_field_or_method()) {
2295 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2296 }
2297 return (jint) cp->uncached_klass_ref_index_at(index);
2298 }
2299 JVM_END
2300
2301 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2302 {
2303 JvmtiVMObjectAllocEventCollector oam;
2304 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2305 bounds_check(cp, index, CHECK_0);
2306 constantTag tag = cp->tag_at(index);
2307 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2308 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2309 }
2310 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2311 }
2312 JVM_END
2313
2314 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2315 {
2316 JvmtiVMObjectAllocEventCollector oam;
2317 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2318 bounds_check(cp, index, CHECK_NULL);
2319 constantTag tag = cp->tag_at(index);
2320 if (!tag.is_name_and_type()) {
2321 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2322 }
2323 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2324 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2325 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2326 objArrayHandle dest(THREAD, dest_o);
2327 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2328 dest->obj_at_put(0, str());
2329 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2330 dest->obj_at_put(1, str());
2331 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2332 }
2333 JVM_END
2334
2335 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2336 {
2337 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2338 bounds_check(cp, index, CHECK_0);
2339 constantTag tag = cp->tag_at(index);
2340 if (!tag.is_int()) {
2341 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2342 }
2343 return cp->int_at(index);
2344 }
2345 JVM_END
2346
2347 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2348 {
2349 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2350 bounds_check(cp, index, CHECK_(0L));
2351 constantTag tag = cp->tag_at(index);
2352 if (!tag.is_long()) {
2353 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2354 }
2355 return cp->long_at(index);
2356 }
2357 JVM_END
2358
2359 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2360 {
2361 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2362 bounds_check(cp, index, CHECK_(0.0f));
2363 constantTag tag = cp->tag_at(index);
2364 if (!tag.is_float()) {
2365 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2366 }
2367 return cp->float_at(index);
2368 }
2369 JVM_END
2370
2371 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2372 {
2373 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2374 bounds_check(cp, index, CHECK_(0.0));
2375 constantTag tag = cp->tag_at(index);
2376 if (!tag.is_double()) {
2377 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2378 }
2379 return cp->double_at(index);
2380 }
2381 JVM_END
2382
2383 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2384 {
2385 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2386 bounds_check(cp, index, CHECK_NULL);
2387 constantTag tag = cp->tag_at(index);
2388 if (!tag.is_string()) {
2389 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2390 }
2391 oop str = cp->string_at(index, CHECK_NULL);
2392 return (jstring) JNIHandles::make_local(THREAD, str);
2393 }
2394 JVM_END
2395
2396 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2397 {
2398 JvmtiVMObjectAllocEventCollector oam;
2399 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2400 bounds_check(cp, index, CHECK_NULL);
2401 constantTag tag = cp->tag_at(index);
2402 if (!tag.is_symbol()) {
2403 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2404 }
2405 Symbol* sym = cp->symbol_at(index);
2406 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2407 return (jstring) JNIHandles::make_local(THREAD, str());
2408 }
2409 JVM_END
2410
2411 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2412 {
2413 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2414 bounds_check(cp, index, CHECK_0);
2415 constantTag tag = cp->tag_at(index);
2416 jbyte result = tag.value();
2417 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2418 // they are changed to the corresponding tags from the JVM spec, so that java code in
2419 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2420 if (tag.is_klass_or_reference()) {
2421 result = JVM_CONSTANT_Class;
2422 } else if (tag.is_string_index()) {
2423 result = JVM_CONSTANT_String;
2424 } else if (tag.is_method_type_in_error()) {
2425 result = JVM_CONSTANT_MethodType;
2426 } else if (tag.is_method_handle_in_error()) {
2427 result = JVM_CONSTANT_MethodHandle;
2428 } else if (tag.is_dynamic_constant_in_error()) {
2429 result = JVM_CONSTANT_Dynamic;
2430 }
2431 return result;
2432 }
2433 JVM_END
2434
2435 // Assertion support. //////////////////////////////////////////////////////////
2436
2437 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2438 assert(cls != nullptr, "bad class");
2439
2440 oop r = JNIHandles::resolve(cls);
2441 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2442 if (java_lang_Class::is_primitive(r)) return false;
2443
2444 Klass* k = java_lang_Class::as_Klass(r);
2445 assert(k->is_instance_klass(), "must be an instance klass");
2446 if (!k->is_instance_klass()) return false;
2447
2448 ResourceMark rm(THREAD);
2449 const char* name = k->name()->as_C_string();
2450 bool system_class = k->class_loader() == nullptr;
2451 return JavaAssertions::enabled(name, system_class);
2452
2453 JVM_END
2454
2455
2456 // Return a new AssertionStatusDirectives object with the fields filled in with
2457 // command-line assertion arguments (i.e., -ea, -da).
2458 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2459 JvmtiVMObjectAllocEventCollector oam;
2460 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2461 return JNIHandles::make_local(THREAD, asd);
2462 JVM_END
2463
2464 // Verification ////////////////////////////////////////////////////////////////////////////////
2465
2466 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2467
2468 // RedefineClasses support: bug 6214132 caused verification to fail.
2469 // All functions from this section should call the jvmtiThreadSate function:
2470 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2471 // The function returns a Klass* of the _scratch_class if the verifier
2472 // was invoked in the middle of the class redefinition.
2473 // Otherwise it returns its argument value which is the _the_class Klass*.
2474 // Please, refer to the description in the jvmtiThreadState.hpp.
2475
2476 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2477 oop mirror = JNIHandles::resolve_non_null(cls);
2478 if (java_lang_Class::is_primitive(mirror)) {
2479 return JNI_FALSE;
2480 }
2481 Klass* k = java_lang_Class::as_Klass(mirror);
2482 // This isn't necessary since answer is the same since redefinition
2483 // has already checked this matches for the scratch class.
2484 // k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2485 jboolean result = k->is_interface();
2486 assert(!result || k->is_instance_klass(),
2487 "all interfaces are instance types");
2488 return result;
2489 JVM_END
2490
2491
2492 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2493 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2494 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2495 return k->name()->as_utf8();
2496 JVM_END
2497
2498
2499 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2500 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2501 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2502 // types will have length zero if this is not an InstanceKlass
2503 // (length is determined by call to JVM_GetClassCPEntriesCount)
2504 if (k->is_instance_klass()) {
2505 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2506 for (int index = cp->length() - 1; index >= 0; index--) {
2507 constantTag tag = cp->tag_at(index);
2508 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2509 }
2510 }
2511 JVM_END
2512
2513
2514 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2515 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2516 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2517 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2518 JVM_END
2519
2520
2521 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2522 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2523 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2524 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2525 JVM_END
2526
2527
2528 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2529 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2530 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2531 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2532 JVM_END
2533
2534
2535 // The following methods, used for the verifier, are never called with
2536 // array klasses, so a direct cast to InstanceKlass is safe.
2537 // Typically, these methods are called in a loop with bounds determined
2538 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2539 // zero for arrays.
2540 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2541 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2542 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2543 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2544 int length = method->checked_exceptions_length();
2545 if (length > 0) {
2546 CheckedExceptionElement* table= method->checked_exceptions_start();
2547 for (int i = 0; i < length; i++) {
2548 exceptions[i] = table[i].class_cp_index;
2549 }
2550 }
2551 JVM_END
2552
2553
2554 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2555 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2556 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2557 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2558 return method->checked_exceptions_length();
2559 JVM_END
2560
2561
2562 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2563 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2564 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2565 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2566 memcpy(code, method->code_base(), method->code_size());
2567 JVM_END
2568
2569
2570 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2572 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2573 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2574 return method->code_size();
2575 JVM_END
2576
2577
2578 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2579 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2580 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2581 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2582 ExceptionTable extable(method);
2583 entry->start_pc = extable.start_pc(entry_index);
2584 entry->end_pc = extable.end_pc(entry_index);
2585 entry->handler_pc = extable.handler_pc(entry_index);
2586 entry->catchType = extable.catch_type_index(entry_index);
2587 JVM_END
2588
2589
2590 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2591 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2592 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2593 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2594 return method->exception_table_length();
2595 JVM_END
2596
2597
2598 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2599 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2600 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2601 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2602 return method->access_flags().as_method_flags();
2603 JVM_END
2604
2605
2606 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2607 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2608 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2609 return InstanceKlass::cast(k)->field_access_flags(field_index);
2610 JVM_END
2611
2612
2613 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2614 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2615 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2616 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2617 return method->max_locals();
2618 JVM_END
2619
2620
2621 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2622 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2623 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2624 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2625 return method->size_of_parameters();
2626 JVM_END
2627
2628
2629 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2630 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2631 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2632 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2633 return method->verifier_max_stack();
2634 JVM_END
2635
2636
2637 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2638 ResourceMark rm(THREAD);
2639 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2640 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2641 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2642 return method->is_object_constructor();
2643 JVM_END
2644
2645
2646 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2647 ResourceMark rm(THREAD);
2648 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2649 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2650 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2651 return method->is_overpass();
2652 JVM_END
2653
2654 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2655 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2656 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2657 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2658 return method->name()->as_utf8();
2659 JVM_END
2660
2661
2662 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2663 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2664 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2665 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2666 return method->signature()->as_utf8();
2667 JVM_END
2668
2669 /**
2670 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2671 * read entries in the constant pool. Since the old verifier always
2672 * works on a copy of the code, it will not see any rewriting that
2673 * may possibly occur in the middle of verification. So it is important
2674 * that nothing it calls tries to use the cpCache instead of the raw
2675 * constant pool, so we must use cp->uncached_x methods when appropriate.
2676 */
2677 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2678 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2679 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2680 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2681 switch (cp->tag_at(cp_index).value()) {
2682 case JVM_CONSTANT_Fieldref:
2683 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2684 default:
2685 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2686 }
2687 ShouldNotReachHere();
2688 return nullptr;
2689 JVM_END
2690
2691
2692 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2693 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2694 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2695 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2696 switch (cp->tag_at(cp_index).value()) {
2697 case JVM_CONSTANT_InterfaceMethodref:
2698 case JVM_CONSTANT_Methodref:
2699 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2700 default:
2701 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2702 }
2703 ShouldNotReachHere();
2704 return nullptr;
2705 JVM_END
2706
2707
2708 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2709 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2710 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2711 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2712 switch (cp->tag_at(cp_index).value()) {
2713 case JVM_CONSTANT_InterfaceMethodref:
2714 case JVM_CONSTANT_Methodref:
2715 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2716 default:
2717 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2718 }
2719 ShouldNotReachHere();
2720 return nullptr;
2721 JVM_END
2722
2723
2724 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2725 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2726 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2727 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2728 switch (cp->tag_at(cp_index).value()) {
2729 case JVM_CONSTANT_Fieldref:
2730 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2731 default:
2732 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2733 }
2734 ShouldNotReachHere();
2735 return nullptr;
2736 JVM_END
2737
2738
2739 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2740 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2741 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2742 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2743 Symbol* classname = cp->klass_name_at(cp_index);
2744 return classname->as_utf8();
2745 JVM_END
2746
2747
2748 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2749 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2750 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2751 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2752 switch (cp->tag_at(cp_index).value()) {
2753 case JVM_CONSTANT_Fieldref: {
2754 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2755 Symbol* classname = cp->klass_name_at(class_index);
2756 return classname->as_utf8();
2757 }
2758 default:
2759 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2760 }
2761 ShouldNotReachHere();
2762 return nullptr;
2763 JVM_END
2764
2765
2766 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2767 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2768 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2769 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2770 switch (cp->tag_at(cp_index).value()) {
2771 case JVM_CONSTANT_Methodref:
2772 case JVM_CONSTANT_InterfaceMethodref: {
2773 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2774 Symbol* classname = cp->klass_name_at(class_index);
2775 return classname->as_utf8();
2776 }
2777 default:
2778 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2779 }
2780 ShouldNotReachHere();
2781 return nullptr;
2782 JVM_END
2783
2784
2785 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2786 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2787 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2788 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2789 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2790 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2791 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2792 switch (cp->tag_at(cp_index).value()) {
2793 case JVM_CONSTANT_Fieldref: {
2794 Symbol* name = cp->uncached_name_ref_at(cp_index);
2795 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2796 InstanceKlass* ik = InstanceKlass::cast(k_called);
2797 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2798 if (fs.name() == name && fs.signature() == signature) {
2799 return fs.access_flags().as_field_flags();
2800 }
2801 }
2802 return -1;
2803 }
2804 default:
2805 fatal("JVM_GetCPFieldModifiers: illegal constant");
2806 }
2807 ShouldNotReachHere();
2808 return 0;
2809 JVM_END
2810
2811
2812 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2813 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2814 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2815 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2816 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2817 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2818 switch (cp->tag_at(cp_index).value()) {
2819 case JVM_CONSTANT_Methodref:
2820 case JVM_CONSTANT_InterfaceMethodref: {
2821 Symbol* name = cp->uncached_name_ref_at(cp_index);
2822 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2823 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2824 int methods_count = methods->length();
2825 for (int i = 0; i < methods_count; i++) {
2826 Method* method = methods->at(i);
2827 if (method->name() == name && method->signature() == signature) {
2828 return method->access_flags().as_method_flags();
2829 }
2830 }
2831 return -1;
2832 }
2833 default:
2834 fatal("JVM_GetCPMethodModifiers: illegal constant");
2835 }
2836 ShouldNotReachHere();
2837 return 0;
2838 JVM_END
2839
2840
2841 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2842
2843 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2844 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2845 JVM_END
2846
2847
2848 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2849 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2850 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2851 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2852 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2853 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2854 JVM_END
2855
2856 // Printing support //////////////////////////////////////////////////
2857 extern "C" {
2858
2859 ATTRIBUTE_PRINTF(3, 0)
2860 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2861 // Reject count values that are negative signed values converted to
2862 // unsigned; see bug 4399518, 4417214
2863 if ((intptr_t)count <= 0) return -1;
2864
2865 int result = os::vsnprintf(str, count, fmt, args);
2866 if (result > 0 && (size_t)result >= count) {
2867 result = -1;
2868 }
2869
2870 return result;
2871 }
2872
2873 ATTRIBUTE_PRINTF(3, 4)
2874 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2875 va_list args;
2876 int len;
2877 va_start(args, fmt);
2878 len = jio_vsnprintf(str, count, fmt, args);
2879 va_end(args);
2880 return len;
2881 }
2882
2883 ATTRIBUTE_PRINTF(2, 3)
2884 int jio_fprintf(FILE* f, const char *fmt, ...) {
2885 int len;
2886 va_list args;
2887 va_start(args, fmt);
2888 len = jio_vfprintf(f, fmt, args);
2889 va_end(args);
2890 return len;
2891 }
2892
2893 ATTRIBUTE_PRINTF(2, 0)
2894 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2895 if (Arguments::vfprintf_hook() != nullptr) {
2896 return Arguments::vfprintf_hook()(f, fmt, args);
2897 } else {
2898 return vfprintf(f, fmt, args);
2899 }
2900 }
2901
2902 ATTRIBUTE_PRINTF(1, 2)
2903 JNIEXPORT int jio_printf(const char *fmt, ...) {
2904 int len;
2905 va_list args;
2906 va_start(args, fmt);
2907 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2908 va_end(args);
2909 return len;
2910 }
2911
2912 // HotSpot specific jio method
2913 void jio_print(const char* s, size_t len) {
2914 // Try to make this function as atomic as possible.
2915 if (Arguments::vfprintf_hook() != nullptr) {
2916 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2917 } else {
2918 // Make an unused local variable to avoid warning from gcc compiler.
2919 bool dummy = os::write(defaultStream::output_fd(), s, len);
2920 }
2921 }
2922
2923 } // Extern C
2924
2925 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2926
2927 // In most of the JVM thread support functions we need to access the
2928 // thread through a ThreadsListHandle to prevent it from exiting and
2929 // being reclaimed while we try to operate on it. The exceptions to this
2930 // rule are when operating on the current thread, or if the monitor of
2931 // the target java.lang.Thread is locked at the Java level - in both
2932 // cases the target cannot exit.
2933
2934 static void thread_entry(JavaThread* thread, TRAPS) {
2935 HandleMark hm(THREAD);
2936 Handle obj(THREAD, thread->threadObj());
2937 JavaValue result(T_VOID);
2938 JavaCalls::call_virtual(&result,
2939 obj,
2940 vmClasses::Thread_klass(),
2941 vmSymbols::run_method_name(),
2942 vmSymbols::void_method_signature(),
2943 THREAD);
2944 }
2945
2946
2947 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2948 #if INCLUDE_CDS
2949 if (CDSConfig::allow_only_single_java_thread()) {
2950 // During java -Xshare:dump, if we allow multiple Java threads to
2951 // execute in parallel, symbols and classes may be loaded in
2952 // random orders which will make the resulting CDS archive
2953 // non-deterministic.
2954 //
2955 // Lucikly, during java -Xshare:dump, it's important to run only
2956 // the code in the main Java thread (which is NOT started here) that
2957 // creates the module graph, etc. It's safe to not start the other
2958 // threads which are launched by class static initializers
2959 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2960 if (log_is_enabled(Info, cds)) {
2961 ResourceMark rm;
2962 oop t = JNIHandles::resolve_non_null(jthread);
2963 log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2964 }
2965 return;
2966 }
2967 #endif
2968 JavaThread *native_thread = nullptr;
2969
2970 // We cannot hold the Threads_lock when we throw an exception,
2971 // due to rank ordering issues. Example: we might need to grab the
2972 // Heap_lock while we construct the exception.
2973 bool throw_illegal_thread_state = false;
2974
2975 // We must release the Threads_lock before we can post a jvmti event
2976 // in Thread::start.
2977 {
2978 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2979 // Ensure that the C++ Thread and OSThread structures aren't freed before
2980 // we operate.
2981 MutexLocker ml(Threads_lock);
2982
2983 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2984 // re-starting an already started thread, so we should usually find
2985 // that the JavaThread is null. However for a JNI attached thread
2986 // there is a small window between the Thread object being created
2987 // (with its JavaThread set) and the update to its threadStatus, so we
2988 // have to check for this
2989 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2990 throw_illegal_thread_state = true;
2991 } else {
2992 jlong size =
2993 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2994 // Allocate the C++ Thread structure and create the native thread. The
2995 // stack size retrieved from java is 64-bit signed, but the constructor takes
2996 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2997 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2998 // - Avoid passing negative values which would result in really large stacks.
2999 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
3000 size_t sz = size > 0 ? (size_t) size : 0;
3001 native_thread = new JavaThread(&thread_entry, sz);
3002
3003 // At this point it may be possible that no osthread was created for the
3004 // JavaThread due to lack of memory. Check for this situation and throw
3005 // an exception if necessary. Eventually we may want to change this so
3006 // that we only grab the lock if the thread was created successfully -
3007 // then we can also do this check and throw the exception in the
3008 // JavaThread constructor.
3009 if (native_thread->osthread() != nullptr) {
3010 // Note: the current thread is not being used within "prepare".
3011 native_thread->prepare(jthread);
3012 }
3013 }
3014 }
3015
3016 if (throw_illegal_thread_state) {
3017 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3018 }
3019
3020 assert(native_thread != nullptr, "Starting null thread?");
3021
3022 if (native_thread->osthread() == nullptr) {
3023 ResourceMark rm(thread);
3024 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3025 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3026 // No one should hold a reference to the 'native_thread'.
3027 native_thread->smr_delete();
3028 if (JvmtiExport::should_post_resource_exhausted()) {
3029 JvmtiExport::post_resource_exhausted(
3030 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3031 os::native_thread_creation_failed_msg());
3032 }
3033 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3034 os::native_thread_creation_failed_msg());
3035 }
3036
3037 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3038
3039 Thread::start(native_thread);
3040
3041 JVM_END
3042
3043
3044 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3045 ThreadsListHandle tlh(thread);
3046 oop java_thread = nullptr;
3047 JavaThread* receiver = nullptr;
3048 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3049 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3050
3051 if (is_alive) {
3052 // jthread refers to a live JavaThread.
3053 Thread::set_priority(receiver, (ThreadPriority)prio);
3054 }
3055 // Implied else: If the JavaThread hasn't started yet, then the
3056 // priority set in the java.lang.Thread object above will be pushed
3057 // down when it does start.
3058 JVM_END
3059
3060
3061 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3062 HOTSPOT_THREAD_YIELD();
3063 os::naked_yield();
3064 JVM_END
3065
3066 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3067 if (nanos < 0) {
3068 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3069 }
3070
3071 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3072 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3073 }
3074
3075 // Save current thread state and restore it at the end of this block.
3076 // And set new thread state to SLEEPING.
3077 JavaThreadSleepState jtss(thread);
3078
3079 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3080
3081 if (nanos == 0) {
3082 os::naked_yield();
3083 } else {
3084 ThreadState old_state = thread->osthread()->get_state();
3085 thread->osthread()->set_state(SLEEPING);
3086 if (!thread->sleep_nanos(nanos)) { // interrupted
3087 // An asynchronous exception could have been thrown on
3088 // us while we were sleeping. We do not overwrite those.
3089 if (!HAS_PENDING_EXCEPTION) {
3090 HOTSPOT_THREAD_SLEEP_END(1);
3091
3092 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3093 // to properly restore the thread state. That's likely wrong.
3094 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3095 }
3096 }
3097 thread->osthread()->set_state(old_state);
3098 }
3099 HOTSPOT_THREAD_SLEEP_END(0);
3100 JVM_END
3101
3102 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3103 oop jthread = thread->threadObj();
3104 assert(jthread != nullptr, "no current carrier thread!");
3105 return JNIHandles::make_local(THREAD, jthread);
3106 JVM_END
3107
3108 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3109 oop theThread = thread->vthread();
3110 assert(theThread != (oop)nullptr, "no current thread!");
3111 return JNIHandles::make_local(THREAD, theThread);
3112 JVM_END
3113
3114 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3115 jobject theThread))
3116 oop threadObj = JNIHandles::resolve(theThread);
3117 thread->set_vthread(threadObj);
3118
3119 // Set _monitor_owner_id of new current Thread
3120 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3121
3122 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3123 JVM_END
3124
3125 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3126 return ThreadIdentifier::unsafe_offset();
3127 JVM_END
3128
3129 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3130 ThreadsListHandle tlh(thread);
3131 JavaThread* receiver = nullptr;
3132 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3133 if (is_alive) {
3134 // jthread refers to a live JavaThread.
3135 receiver->interrupt();
3136 }
3137 JVM_END
3138
3139 // Return true iff the current thread has locked the object passed in
3140
3141 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3142 if (obj == nullptr) {
3143 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3144 }
3145 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3146 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3147 JVM_END
3148
3149 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3150 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3151 return JNIHandles::make_local(THREAD, trace);
3152 JVM_END
3153
3154 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3155 // We don't use a ThreadsListHandle here because the current thread
3156 // must be alive.
3157 oop java_thread = JNIHandles::resolve_non_null(jthread);
3158 JavaThread* thr = java_lang_Thread::thread(java_thread);
3159 if (thread == thr && !thr->has_attached_via_jni()) {
3160 // Thread naming is only supported for the current thread and
3161 // we don't set the name of an attached thread to avoid stepping
3162 // on other programs.
3163 ResourceMark rm(thread);
3164 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3165 os::set_native_thread_name(thread_name);
3166 }
3167 JVM_END
3168
3169 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3170 oop theCache = thread->scopedValueCache();
3171 return JNIHandles::make_local(THREAD, theCache);
3172 JVM_END
3173
3174 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3175 jobject theCache))
3176 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3177 thread->set_scopedValueCache(objs);
3178 JVM_END
3179
3180
3181 // java.lang.Package ////////////////////////////////////////////////////////////////
3182
3183
3184 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3185 ResourceMark rm(THREAD);
3186 JvmtiVMObjectAllocEventCollector oam;
3187 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3188 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3189 return (jstring) JNIHandles::make_local(THREAD, result);
3190 JVM_END
3191
3192
3193 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3194 JvmtiVMObjectAllocEventCollector oam;
3195 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3196 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3197 JVM_END
3198
3199
3200 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3201
3202
3203 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3204 MonitorLocker ml(Heap_lock);
3205 oop ref = Universe::reference_pending_list();
3206 if (ref != nullptr) {
3207 Universe::clear_reference_pending_list();
3208 }
3209 return JNIHandles::make_local(THREAD, ref);
3210 JVM_END
3211
3212 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3213 MonitorLocker ml(Heap_lock);
3214 return Universe::has_reference_pending_list();
3215 JVM_END
3216
3217 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3218 MonitorLocker ml(Heap_lock);
3219 while (!Universe::has_reference_pending_list()) {
3220 ml.wait();
3221 }
3222 JVM_END
3223
3224 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3225 oop ref_oop = JNIHandles::resolve_non_null(ref);
3226 // PhantomReference has it's own implementation of refersTo().
3227 // See: JVM_PhantomReferenceRefersTo
3228 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3229 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3230 return referent == JNIHandles::resolve(o);
3231 JVM_END
3232
3233 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3234 oop ref_oop = JNIHandles::resolve_non_null(ref);
3235 // FinalReference has it's own implementation of clear().
3236 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3237 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3238 // If the referent has already been cleared then done.
3239 // However, if the referent is dead but has not yet been cleared by
3240 // concurrent reference processing, it should NOT be cleared here.
3241 // Instead, clearing should be left to the GC. Clearing it here could
3242 // detectably lose an expected notification, which is impossible with
3243 // STW reference processing. The clearing in enqueue() doesn't have
3244 // this problem, since the enqueue covers the notification, but it's not
3245 // worth the effort to handle that case specially.
3246 return;
3247 }
3248 java_lang_ref_Reference::clear_referent(ref_oop);
3249 JVM_END
3250
3251
3252 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3253
3254
3255 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3256 oop ref_oop = JNIHandles::resolve_non_null(ref);
3257 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3258 return referent == JNIHandles::resolve(o);
3259 JVM_END
3260
3261
3262 // ObjectInputStream ///////////////////////////////////////////////////////////////
3263
3264 // Return the first user-defined class loader up the execution stack, or null
3265 // if only code from the bootstrap or platform class loader is on the stack.
3266
3267 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3268 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3269 InstanceKlass* ik = vfst.method()->method_holder();
3270 oop loader = ik->class_loader();
3271 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3272 return JNIHandles::make_local(THREAD, loader);
3273 }
3274 }
3275 return nullptr;
3276 JVM_END
3277
3278
3279 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3280
3281
3282 // resolve array handle and check arguments
3283 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3284 if (arr == nullptr) {
3285 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3286 }
3287 oop a = JNIHandles::resolve_non_null(arr);
3288 if (!a->is_array()) {
3289 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3290 } else if (type_array_only && !a->is_typeArray()) {
3291 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3292 }
3293 return arrayOop(a);
3294 }
3295
3296
3297 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3298 arrayOop a = check_array(env, arr, false, CHECK_0);
3299 return a->length();
3300 JVM_END
3301
3302
3303 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3304 JvmtiVMObjectAllocEventCollector oam;
3305 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3306 jvalue value;
3307 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3308 oop box = Reflection::box(&value, type, CHECK_NULL);
3309 return JNIHandles::make_local(THREAD, box);
3310 JVM_END
3311
3312
3313 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3314 jvalue value;
3315 value.i = 0; // to initialize value before getting used in CHECK
3316 arrayOop a = check_array(env, arr, true, CHECK_(value));
3317 assert(a->is_typeArray(), "just checking");
3318 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3319 BasicType wide_type = (BasicType) wCode;
3320 if (type != wide_type) {
3321 Reflection::widen(&value, type, wide_type, CHECK_(value));
3322 }
3323 return value;
3324 JVM_END
3325
3326
3327 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3328 arrayOop a = check_array(env, arr, false, CHECK);
3329 oop box = JNIHandles::resolve(val);
3330 jvalue value;
3331 value.i = 0; // to initialize value before getting used in CHECK
3332 BasicType value_type;
3333 if (a->is_objArray()) {
3334 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3335 value_type = Reflection::unbox_for_regular_object(box, &value);
3336 } else {
3337 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3338 }
3339 Reflection::array_set(&value, a, index, value_type, CHECK);
3340 JVM_END
3341
3342
3343 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3344 arrayOop a = check_array(env, arr, true, CHECK);
3345 assert(a->is_typeArray(), "just checking");
3346 BasicType value_type = (BasicType) vCode;
3347 Reflection::array_set(&v, a, index, value_type, CHECK);
3348 JVM_END
3349
3350
3351 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3352 JvmtiVMObjectAllocEventCollector oam;
3353 oop element_mirror = JNIHandles::resolve(eltClass);
3354 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3355 return JNIHandles::make_local(THREAD, result);
3356 JVM_END
3357
3358
3359 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3360 JvmtiVMObjectAllocEventCollector oam;
3361 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3362 oop element_mirror = JNIHandles::resolve(eltClass);
3363 assert(dim_array->is_typeArray(), "just checking");
3364 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3365 return JNIHandles::make_local(THREAD, result);
3366 JVM_END
3367
3368
3369 // Library support ///////////////////////////////////////////////////////////////////////////
3370
3371 JVM_LEAF(void*, JVM_LoadZipLibrary())
3372 return ZipLibrary::handle();
3373 JVM_END
3374
3375 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3376 //%note jvm_ct
3377 char ebuf[1024];
3378 void *load_result;
3379 {
3380 ThreadToNativeFromVM ttnfvm(thread);
3381 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3382 }
3383 if (load_result == nullptr) {
3384 if (throwException) {
3385 char msg[1024];
3386 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3387 // Since 'ebuf' may contain a string encoded using
3388 // platform encoding scheme, we need to pass
3389 // Exceptions::unsafe_to_utf8 to the new_exception method
3390 // as the last argument. See bug 6367357.
3391 Handle h_exception =
3392 Exceptions::new_exception(thread,
3393 vmSymbols::java_lang_UnsatisfiedLinkError(),
3394 msg, Exceptions::unsafe_to_utf8);
3395
3396 THROW_HANDLE_NULL(h_exception);
3397 } else {
3398 log_info(library)("Failed to load library %s", name);
3399 return load_result;
3400 }
3401 }
3402 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3403 return load_result;
3404 JVM_END
3405
3406
3407 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3408 os::dll_unload(handle);
3409 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3410 JVM_END
3411
3412
3413 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3414 void* find_result = os::dll_lookup(handle, name);
3415 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3416 find_result != nullptr ? "Found" : "Failed to find",
3417 name, p2i(handle));
3418 return find_result;
3419 JVM_END
3420
3421
3422 // JNI version ///////////////////////////////////////////////////////////////////////////////
3423
3424 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3425 return Threads::is_supported_jni_version_including_1_1(version);
3426 JVM_END
3427
3428
3429 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3430 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3431 JVM_END
3432
3433 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3434 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3435 JVM_END
3436
3437 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3438 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3439 JVM_END
3440
3441 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3442 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3443 JVM_END
3444
3445 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3446 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3447 JVM_END
3448
3449 // String support ///////////////////////////////////////////////////////////////////////////
3450
3451 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3452 JvmtiVMObjectAllocEventCollector oam;
3453 if (str == nullptr) return nullptr;
3454 oop string = JNIHandles::resolve_non_null(str);
3455 oop result = StringTable::intern(string, CHECK_NULL);
3456 return (jstring) JNIHandles::make_local(THREAD, result);
3457 JVM_END
3458
3459
3460 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3461
3462 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3463 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3464 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3465 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3466 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3467 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3468
3469
3470 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3471 VM_Exit::block_if_vm_exited();
3472 return new PlatformMutex();
3473 }
3474
3475
3476 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3477 VM_Exit::block_if_vm_exited();
3478 delete ((PlatformMutex*) mon);
3479 }
3480
3481
3482 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3483 VM_Exit::block_if_vm_exited();
3484 ((PlatformMutex*) mon)->lock();
3485 return 0;
3486 }
3487
3488
3489 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3490 VM_Exit::block_if_vm_exited();
3491 ((PlatformMutex*) mon)->unlock();
3492 }
3493
3494
3495 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3496
3497 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3498 Handle loader, jboolean throwError, TRAPS) {
3499 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3500
3501 // Check if we should initialize the class
3502 if (init && klass->is_instance_klass()) {
3503 klass->initialize(CHECK_NULL);
3504 }
3505 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3506 }
3507
3508
3509 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3510
3511 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3512 Handle method_handle;
3513 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3514 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3515 Handle receiver(THREAD, JNIHandles::resolve(obj));
3516 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3517 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3518
3519 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3520 jobject res = JNIHandles::make_local(THREAD, result);
3521 if (JvmtiExport::should_post_vm_object_alloc()) {
3522 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3523 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3524 if (java_lang_Class::is_primitive(ret_type)) {
3525 // Only for primitive type vm allocates memory for java object.
3526 // See box() method.
3527 JvmtiExport::post_vm_object_alloc(thread, result);
3528 }
3529 }
3530 return res;
3531 } else {
3532 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3533 }
3534 JVM_END
3535
3536
3537 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3538 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3539 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3540 oop constructor_mirror = JNIHandles::resolve(c);
3541 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3542 jobject res = JNIHandles::make_local(THREAD, result);
3543 if (JvmtiExport::should_post_vm_object_alloc()) {
3544 JvmtiExport::post_vm_object_alloc(thread, result);
3545 }
3546 return res;
3547 JVM_END
3548
3549 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3550 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3551 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3552 JVM_END
3553
3554 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3555 jclass caller,
3556 jstring interfaceMethodName,
3557 jobject factoryType,
3558 jobject interfaceMethodType,
3559 jobject implementationMember,
3560 jobject dynamicMethodType,
3561 jclass lambdaProxyClass))
3562 #if INCLUDE_CDS
3563 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3564 return;
3565 }
3566
3567 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3568 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3569 if (caller_ik->is_hidden()) {
3570 // Hidden classes not of type lambda proxy classes are currently not being archived.
3571 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3572 // registered for archiving.
3573 return;
3574 }
3575 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3576 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3577 assert(lambda_ik->is_hidden(), "must be a hidden class");
3578 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3579
3580 Symbol* interface_method_name = nullptr;
3581 if (interfaceMethodName != nullptr) {
3582 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3583 }
3584 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3585 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3586
3587 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3588 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3589
3590 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3591 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3592 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3593
3594 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3595 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3596
3597 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3598 interface_method_type, m, dynamic_method_type, THREAD);
3599 #endif // INCLUDE_CDS
3600 JVM_END
3601
3602 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3603 jclass caller,
3604 jstring interfaceMethodName,
3605 jobject factoryType,
3606 jobject interfaceMethodType,
3607 jobject implementationMember,
3608 jobject dynamicMethodType))
3609 #if INCLUDE_CDS
3610
3611 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3612 implementationMember == nullptr || dynamicMethodType == nullptr) {
3613 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3614 }
3615
3616 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3617 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3618 if (!caller_ik->is_shared()) {
3619 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3620 return nullptr;
3621 }
3622
3623 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3624 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3625 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3626
3627 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3628 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3629
3630 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3631 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3632 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3633
3634 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3635 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3636
3637 InstanceKlass* loaded_lambda =
3638 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3639 interface_method_type, m, dynamic_method_type,
3640 CHECK_(nullptr));
3641 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3642 #else
3643 return nullptr;
3644 #endif // INCLUDE_CDS
3645 JVM_END
3646
3647 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3648 if (CDSConfig::is_dumping_static_archive()) {
3649 // We do this so that the default CDS archive can be deterministic.
3650 const char* release = VM_Version::vm_release();
3651 const char* dbg_level = VM_Version::jdk_debug_level();
3652 const char* version = VM_Version::internal_vm_info_string();
3653 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3654 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3655 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3656 seed += (jlong)VM_Version::vm_major_version();
3657 seed += (jlong)VM_Version::vm_minor_version();
3658 seed += (jlong)VM_Version::vm_security_version();
3659 seed += (jlong)VM_Version::vm_patch_version();
3660 if (seed == 0) { // don't let this ever be zero.
3661 seed = 0x87654321;
3662 }
3663 log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3664 return seed;
3665 } else {
3666 return 0;
3667 }
3668 JVM_END
3669
3670 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3671 return CDSConfig::get_status();
3672 JVM_END
3673
3674 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3675 #if INCLUDE_CDS
3676 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3677 if (line != nullptr) {
3678 ResourceMark rm(THREAD);
3679 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3680 char* c_line = java_lang_String::as_utf8_string(h_line());
3681 if (CDSConfig::is_dumping_dynamic_archive()) {
3682 // Note: LambdaFormInvokers::append take same format which is not
3683 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3684 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3685 }
3686 if (ClassListWriter::is_enabled()) {
3687 ClassListWriter w;
3688 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3689 }
3690 }
3691 #endif // INCLUDE_CDS
3692 JVM_END
3693
3694 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3695 #if INCLUDE_CDS
3696 ResourceMark rm(THREAD);
3697 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3698 char* file_name = java_lang_String::as_utf8_string(file_handle());
3699 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3700 #endif // INCLUDE_CDS
3701 JVM_END
3702
3703 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3704 #if INCLUDE_CDS
3705 ResourceMark rm(THREAD);
3706 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3707 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3708 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3709 #endif // INCLUDE_CDS
3710 JVM_END
3711
3712 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3713 #if INCLUDE_CDS
3714 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3715 if (!k->is_instance_klass()) {
3716 return false;
3717 } else {
3718 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3719 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3720 // This class will be cached in AOT-initialized state. No need for init barriers.
3721 return false;
3722 } else {
3723 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3724 // must emit barriers to ensure class initialization during production run.
3725 ResourceMark rm(THREAD);
3726 log_debug(cds)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3727 return true;
3728 }
3729 }
3730 #else
3731 return false;
3732 #endif // INCLUDE_CDS
3733 JVM_END
3734
3735 // Returns an array of all live Thread objects (VM internal JavaThreads,
3736 // jvmti agent threads, and JNI attaching threads are skipped)
3737 // See CR 6404306 regarding JNI attaching threads
3738 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3739 ResourceMark rm(THREAD);
3740 ThreadsListEnumerator tle(THREAD, false, false);
3741 JvmtiVMObjectAllocEventCollector oam;
3742
3743 int num_threads = tle.num_threads();
3744 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3745 objArrayHandle threads_ah(THREAD, r);
3746
3747 for (int i = 0; i < num_threads; i++) {
3748 Handle h = tle.get_threadObj(i);
3749 threads_ah->obj_at_put(i, h());
3750 }
3751
3752 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3753 JVM_END
3754
3755
3756 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3757 // Return StackTraceElement[][], each element is the stack trace of a thread in
3758 // the corresponding entry in the given threads array
3759 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3760 JvmtiVMObjectAllocEventCollector oam;
3761
3762 // Check if threads is null
3763 if (threads == nullptr) {
3764 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3765 }
3766
3767 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3768 objArrayHandle ah(THREAD, a);
3769 int num_threads = ah->length();
3770 // check if threads is non-empty array
3771 if (num_threads == 0) {
3772 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3773 }
3774
3775 // check if threads is not an array of objects of Thread class
3776 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3777 if (k != vmClasses::Thread_klass()) {
3778 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3779 }
3780
3781 ResourceMark rm(THREAD);
3782
3783 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3784 for (int i = 0; i < num_threads; i++) {
3785 oop thread_obj = ah->obj_at(i);
3786 instanceHandle h(THREAD, (instanceOop) thread_obj);
3787 thread_handle_array->append(h);
3788 }
3789
3790 // The JavaThread references in thread_handle_array are validated
3791 // in VM_ThreadDump::doit().
3792 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3793 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3794
3795 JVM_END
3796
3797 // JVM monitoring and management support
3798 JVM_LEAF(void*, JVM_GetManagement(jint version))
3799 return Management::get_jmm_interface(version);
3800 JVM_END
3801
3802 // com.sun.tools.attach.VirtualMachine agent properties support
3803 //
3804 // Initialize the agent properties with the properties maintained in the VM
3805 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3806 ResourceMark rm;
3807
3808 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3809
3810 PUTPROP(props, "sun.java.command", Arguments::java_command());
3811 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3812 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3813 return properties;
3814 JVM_END
3815
3816 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3817 {
3818 JvmtiVMObjectAllocEventCollector oam;
3819
3820 if (ofClass == nullptr) {
3821 return nullptr;
3822 }
3823 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3824 // Special handling for primitive objects
3825 if (java_lang_Class::is_primitive(mirror())) {
3826 return nullptr;
3827 }
3828 Klass* k = java_lang_Class::as_Klass(mirror());
3829 if (!k->is_instance_klass()) {
3830 return nullptr;
3831 }
3832 InstanceKlass* ik = InstanceKlass::cast(k);
3833 int encl_method_class_idx = ik->enclosing_method_class_index();
3834 if (encl_method_class_idx == 0) {
3835 return nullptr;
3836 }
3837 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3838 objArrayHandle dest(THREAD, dest_o);
3839 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3840 dest->obj_at_put(0, enc_k->java_mirror());
3841 int encl_method_method_idx = ik->enclosing_method_method_index();
3842 if (encl_method_method_idx != 0) {
3843 Symbol* sym = ik->constants()->symbol_at(
3844 extract_low_short_from_int(
3845 ik->constants()->name_and_type_at(encl_method_method_idx)));
3846 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3847 dest->obj_at_put(1, str());
3848 sym = ik->constants()->symbol_at(
3849 extract_high_short_from_int(
3850 ik->constants()->name_and_type_at(encl_method_method_idx)));
3851 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3852 dest->obj_at_put(2, str());
3853 }
3854 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3855 }
3856 JVM_END
3857
3858 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3859 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3860 ResourceMark rm(THREAD);
3861
3862 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3863 return nullptr;
3864 }
3865
3866 char** vm_flags = Arguments::jvm_flags_array();
3867 char** vm_args = Arguments::jvm_args_array();
3868 int num_flags = Arguments::num_jvm_flags();
3869 int num_args = Arguments::num_jvm_args();
3870
3871 InstanceKlass* ik = vmClasses::String_klass();
3872 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3873 objArrayHandle result_h(THREAD, r);
3874
3875 int index = 0;
3876 for (int j = 0; j < num_flags; j++, index++) {
3877 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3878 result_h->obj_at_put(index, h());
3879 }
3880 for (int i = 0; i < num_args; i++, index++) {
3881 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3882 result_h->obj_at_put(index, h());
3883 }
3884 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3885 JVM_END
3886
3887 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3888 return os::get_signal_number(name);
3889 JVM_END
3890
3891 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3892 #if INCLUDE_JVMTI
3893 if (!DoJVMTIVirtualThreadTransitions) {
3894 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3895 return;
3896 }
3897 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3898 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3899 } else {
3900 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3901 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3902 }
3903 #endif
3904 JVM_END
3905
3906 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3907 #if INCLUDE_JVMTI
3908 if (!DoJVMTIVirtualThreadTransitions) {
3909 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3910 return;
3911 }
3912 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3913 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3914 } else {
3915 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3916 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3917 }
3918 #endif
3919 JVM_END
3920
3921 // If notifications are disabled then just update the VTMS transition bit and return.
3922 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3923 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3924 #if INCLUDE_JVMTI
3925 if (!DoJVMTIVirtualThreadTransitions) {
3926 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3927 return;
3928 }
3929 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3930 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3931 } else {
3932 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3933 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3934 }
3935 #endif
3936 JVM_END
3937
3938 // If notifications are disabled then just update the VTMS transition bit and return.
3939 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3940 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3941 #if INCLUDE_JVMTI
3942 if (!DoJVMTIVirtualThreadTransitions) {
3943 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3944 return;
3945 }
3946 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3947 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3948 } else {
3949 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3950 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3951 }
3952 #endif
3953 JVM_END
3954
3955 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3956 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3957 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3958 #if INCLUDE_JVMTI
3959 if (!DoJVMTIVirtualThreadTransitions) {
3960 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3961 return;
3962 }
3963 assert(thread->is_disable_suspend() != (bool)enter,
3964 "nested or unbalanced monitor enter/exit is not allowed");
3965 thread->toggle_is_disable_suspend();
3966 #endif
3967 JVM_END
3968
3969 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3970 #if INCLUDE_JFR
3971 freeze_result result = THREAD->last_freeze_fail_result();
3972 assert(result != freeze_ok, "sanity check");
3973 EventVirtualThreadPinned event(UNTIMED);
3974 event.set_starttime(THREAD->last_freeze_fail_time());
3975 if (event.should_commit()) {
3976 ResourceMark rm(THREAD);
3977 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3978 THREAD->post_vthread_pinned_event(&event, str, result);
3979 }
3980 #endif
3981 JVM_END
3982
3983 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3984 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3985 assert(parkEvent != nullptr, "not initialized");
3986
3987 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3988 oop vthread_head = nullptr;
3989 while (true) {
3990 if (list_head.peek() != nullptr) {
3991 for (;;) {
3992 oop head = list_head.resolve();
3993 if (list_head.cmpxchg(head, nullptr) == head) {
3994 return JNIHandles::make_local(THREAD, head);
3995 }
3996 }
3997 }
3998 ThreadBlockInVM tbivm(THREAD);
3999 parkEvent->park();
4000 }
4001 JVM_END
4002 /*
4003 * Return the current class's class file version. The low order 16 bits of the
4004 * returned jint contain the class's major version. The high order 16 bits
4005 * contain the class's minor version.
4006 */
4007 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4008 oop mirror = JNIHandles::resolve_non_null(current);
4009 if (java_lang_Class::is_primitive(mirror)) {
4010 // return latest major version and minor version of 0.
4011 return JVM_CLASSFILE_MAJOR_VERSION;
4012 }
4013 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4014
4015 Klass* c = java_lang_Class::as_Klass(mirror);
4016 assert(c->is_instance_klass(), "must be");
4017 InstanceKlass* ik = InstanceKlass::cast(c);
4018 return (ik->minor_version() << 16) | ik->major_version();
4019 JVM_END
4020
4021 /*
4022 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4023 * get the value will see a materialized value and not a scalar-replaced
4024 * null value.
4025 */
4026 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4027 JVM_EnsureMaterializedForStackWalk(env, value);
4028 JVM_END
4029
4030 /*
4031 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4032 */
4033 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4034 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4035 JVM_END