1 /*
2 * Copyright (c) 1997, 2026, 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/aotMetaspace.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/classListParser.hpp"
29 #include "cds/classListWriter.hpp"
30 #include "cds/dynamicArchive.hpp"
31 #include "cds/heapShared.hpp"
32 #include "cds/lambdaFormInvokers.hpp"
33 #include "cds/lambdaProxyClassDictionary.hpp"
34 #include "classfile/classFileStream.hpp"
35 #include "classfile/classLoader.inline.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/objArrayKlass.hpp"
66 #include "oops/objArrayOop.inline.hpp"
67 #include "oops/oop.inline.hpp"
68 #include "oops/recordComponent.hpp"
69 #include "oops/refArrayOop.inline.hpp"
70 #include "prims/foreignGlobals.hpp"
71 #include "prims/jvm_misc.hpp"
72 #include "prims/jvmtiExport.hpp"
73 #include "prims/jvmtiThreadState.inline.hpp"
74 #include "prims/stackwalk.hpp"
75 #include "runtime/arguments.hpp"
76 #include "runtime/atomicAccess.hpp"
77 #include "runtime/continuation.hpp"
78 #include "runtime/deoptimization.hpp"
79 #include "runtime/globals_extension.hpp"
80 #include "runtime/handles.inline.hpp"
81 #include "runtime/handshake.hpp"
82 #include "runtime/init.hpp"
83 #include "runtime/interfaceSupport.inline.hpp"
84 #include "runtime/java.hpp"
85 #include "runtime/javaCalls.hpp"
86 #include "runtime/javaThread.hpp"
87 #include "runtime/jfieldIDWorkaround.hpp"
88 #include "runtime/jniHandles.inline.hpp"
89 #include "runtime/mountUnmountDisabler.hpp"
90 #include "runtime/os.inline.hpp"
91 #include "runtime/osThread.hpp"
92 #include "runtime/perfData.hpp"
93 #include "runtime/reflection.hpp"
94 #include "runtime/synchronizer.hpp"
95 #include "runtime/threadIdentifier.hpp"
96 #include "runtime/threadSMR.hpp"
97 #include "runtime/vframe.inline.hpp"
98 #include "runtime/vm_version.hpp"
99 #include "runtime/vmOperations.hpp"
100 #include "services/attachListener.hpp"
101 #include "services/management.hpp"
102 #include "services/threadService.hpp"
103 #include "utilities/checkedCast.hpp"
104 #include "utilities/copy.hpp"
105 #include "utilities/defaultStream.hpp"
106 #include "utilities/dtrace.hpp"
107 #include "utilities/events.hpp"
108 #include "utilities/macros.hpp"
109 #include "utilities/utf8.hpp"
110 #include "utilities/zipLibrary.hpp"
111 #if INCLUDE_CDS
112 #include "classfile/systemDictionaryShared.hpp"
113 #endif
114 #if INCLUDE_JFR
115 #include "jfr/jfr.hpp"
116 #endif
117 #if INCLUDE_MANAGEMENT
118 #include "services/finalizerService.hpp"
119 #endif
120 #ifdef LINUX
121 #include "osContainer_linux.hpp"
122 #endif
123
124 #include <errno.h>
125
126 /*
127 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
128 such ctors and calls MUST NOT come between an oop declaration/init and its
129 usage because if objects are move this may cause various memory stomps, bus
130 errors and segfaults. Here is a cookbook for causing so called "naked oop
131 failures":
132
133 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
134 // Object address to be held directly in mirror & not visible to GC
135 oop mirror = JNIHandles::resolve_non_null(ofClass);
136
137 // If this ctor can hit a safepoint, moving objects around, then
138 ComplexConstructor foo;
139
140 // Boom! mirror may point to JUNK instead of the intended object
141 (some dereference of mirror)
142
143 // Here's another call that may block for GC, making mirror stale
144 MutexLocker ml(some_lock);
145
146 // And here's an initializer that can result in a stale oop
147 // all in one step.
148 oop o = call_that_can_throw_exception(TRAPS);
149
150
151 The solution is to keep the oop declaration BELOW the ctor or function
152 call that might cause a GC, do another resolve to reassign the oop, or
153 consider use of a Handle instead of an oop so there is immunity from object
154 motion. But note that the "QUICK" entries below do not have a handlemark
155 and thus can only support use of handles passed in.
156 */
157
158 extern void trace_class_resolution(Klass* to_class) {
159 ResourceMark rm;
160 int line_number = -1;
161 const char * source_file = nullptr;
162 const char * trace = "explicit";
163 InstanceKlass* caller = nullptr;
164 JavaThread* jthread = JavaThread::current();
165 if (jthread->has_last_Java_frame()) {
166 vframeStream vfst(jthread);
167
168 // Scan up the stack skipping ClassLoader frames.
169 Method* last_caller = nullptr;
170
171 while (!vfst.at_end()) {
172 Method* m = vfst.method();
173 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
174 break;
175 }
176 last_caller = m;
177 vfst.next();
178 }
179 // if this is called from Class.forName0 and that is called from Class.forName,
180 // then print the caller of Class.forName. If this is Class.loadClass, then print
181 // that caller, otherwise keep quiet since this should be picked up elsewhere.
182 bool found_it = false;
183 if (!vfst.at_end() &&
184 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
185 vfst.method()->name() == vmSymbols::forName0_name()) {
186 vfst.next();
187 if (!vfst.at_end() &&
188 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
189 vfst.method()->name() == vmSymbols::forName_name()) {
190 vfst.next();
191 found_it = true;
192 }
193 } else if (last_caller != nullptr &&
194 last_caller->method_holder()->name() ==
195 vmSymbols::java_lang_ClassLoader() &&
196 last_caller->name() == vmSymbols::loadClass_name()) {
197 found_it = true;
198 } else if (!vfst.at_end()) {
199 if (vfst.method()->is_native()) {
200 // JNI call
201 found_it = true;
202 }
203 }
204 if (found_it && !vfst.at_end()) {
205 // found the caller
206 caller = vfst.method()->method_holder();
207 line_number = vfst.method()->line_number_from_bci(vfst.bci());
208 if (line_number == -1) {
209 // show method name if it's a native method
210 trace = vfst.method()->name_and_sig_as_C_string();
211 }
212 Symbol* s = caller->source_file_name();
213 if (s != nullptr) {
214 source_file = s->as_C_string();
215 }
216 }
217 }
218 if (caller != nullptr) {
219 if (to_class != caller) {
220 const char * from = caller->external_name();
221 const char * to = to_class->external_name();
222 // print in a single call to reduce interleaving between threads
223 if (source_file != nullptr) {
224 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
225 } else {
226 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
227 }
228 }
229 }
230 }
231
232 // java.lang.System //////////////////////////////////////////////////////////////////////
233
234 JVM_ENTRY(jboolean, JVM_AOTEndRecording(JNIEnv *env))
235 #if INCLUDE_CDS
236 if (CDSConfig::is_dumping_preimage_static_archive()) {
237 if (!AOTMetaspace::preimage_static_archive_dumped()) {
238 AOTMetaspace::dump_static_archive(THREAD);
239 return JNI_TRUE;
240 }
241 }
242 return JNI_FALSE;
243 #else
244 return JNI_FALSE;
245 #endif // INCLUDE_CDS
246 JVM_END
247
248 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
249 return os::javaTimeMillis();
250 JVM_END
251
252 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
253 return os::javaTimeNanos();
254 JVM_END
255
256 // The function below is actually exposed by jdk.internal.misc.VM and not
257 // java.lang.System, but we choose to keep it here so that it stays next
258 // to JVM_CurrentTimeMillis and JVM_NanoTime
259
260 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
261 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
262
263 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
264 jlong seconds;
265 jlong nanos;
266
267 os::javaTimeSystemUTC(seconds, nanos);
268
269 // We're going to verify that the result can fit in a long.
270 // For that we need the difference in seconds between 'seconds'
271 // and 'offset_secs' to be such that:
272 // |seconds - offset_secs| < (2^63/10^9)
273 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
274 // which makes |seconds - offset_secs| < 2^33
275 // and we will prefer +/- 2^32 as the maximum acceptable diff
276 // as 2^32 has a more natural feel than 2^33...
277 //
278 // So if |seconds - offset_secs| >= 2^32 - we return a special
279 // sentinel value (-1) which the caller should take as an
280 // exception value indicating that the offset given to us is
281 // too far from range of the current time - leading to too big
282 // a nano adjustment. The caller is expected to recover by
283 // computing a more accurate offset and calling this method
284 // again. (For the record 2^32 secs is ~136 years, so that
285 // should rarely happen)
286 //
287 jlong diff = seconds - offset_secs;
288 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
289 return -1; // sentinel value: the offset is too far off the target
290 }
291
292 // return the adjustment. If you compute a time by adding
293 // this number of nanoseconds along with the number of seconds
294 // in the offset you should get the current UTC time.
295 return (diff * (jlong)1000000000) + nanos;
296 JVM_END
297
298 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
299 jobject dst, jint dst_pos, jint length))
300 // Check if we have null pointers
301 if (src == nullptr || dst == nullptr) {
302 THROW(vmSymbols::java_lang_NullPointerException());
303 }
304 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
305 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
306 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
307 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
308 // Do copy
309 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
310 JVM_END
311
312
313 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
314 JavaValue r(T_OBJECT);
315 // public synchronized Object put(Object key, Object value);
316 HandleMark hm(THREAD);
317 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
318 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
319 JavaCalls::call_virtual(&r,
320 props,
321 vmClasses::Properties_klass(),
322 vmSymbols::put_name(),
323 vmSymbols::object_object_object_signature(),
324 key_str,
325 value_str,
326 THREAD);
327 }
328
329
330 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
331
332 /*
333 * Return all of the system properties in a Java String array with alternating
334 * names and values from the jvm SystemProperty.
335 * Which includes some internal and all commandline -D defined properties.
336 */
337 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
338 ResourceMark rm(THREAD);
339 HandleMark hm(THREAD);
340 int ndx = 0;
341 int fixedCount = 2;
342
343 SystemProperty* p = Arguments::system_properties();
344 int count = Arguments::PropertyList_count(p);
345
346 // Allocate result String array
347 InstanceKlass* ik = vmClasses::String_klass();
348 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
349 objArrayHandle result_h(THREAD, r);
350
351 while (p != nullptr) {
352 const char * key = p->key();
353 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
354 const char * value = p->value();
355 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
356 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
357 result_h->obj_at_put(ndx * 2, key_str());
358 result_h->obj_at_put(ndx * 2 + 1, value_str());
359 ndx++;
360 }
361 p = p->next();
362 }
363
364 // Convert the -XX:MaxDirectMemorySize= command line flag
365 // to the sun.nio.MaxDirectMemorySize property.
366 // Do this after setting user properties to prevent people
367 // from setting the value with a -D option, as requested.
368 // Leave empty if not supplied
369 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
370 char as_chars[256];
371 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
372 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
373 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
374 result_h->obj_at_put(ndx * 2, key_str());
375 result_h->obj_at_put(ndx * 2 + 1, value_str());
376 ndx++;
377 }
378
379 // JVM monitoring and management support
380 // Add the sun.management.compiler property for the compiler's name
381 {
382 #undef CSIZE
383 #if defined(_LP64)
384 #define CSIZE "64-Bit "
385 #else
386 #define CSIZE
387 #endif // 64bit
388
389 #if COMPILER1_AND_COMPILER2
390 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
391 #else
392 #if defined(COMPILER1)
393 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
394 #elif defined(COMPILER2)
395 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
396 #elif INCLUDE_JVMCI
397 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
398 #else
399 const char* compiler_name = "";
400 #endif // compilers
401 #endif // COMPILER1_AND_COMPILER2
402
403 if (*compiler_name != '\0' &&
404 (Arguments::mode() != Arguments::_int)) {
405 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
406 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
407 result_h->obj_at_put(ndx * 2, key_str());
408 result_h->obj_at_put(ndx * 2 + 1, value_str());
409 ndx++;
410 }
411 }
412
413 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
414 JVM_END
415
416
417 /*
418 * Return the temporary directory that the VM uses for the attach
419 * and perf data files.
420 *
421 * It is important that this directory is well-known and the
422 * same for all VM instances. It cannot be affected by configuration
423 * variables such as java.io.tmpdir.
424 */
425 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
426 HandleMark hm(THREAD);
427 const char* temp_dir = os::get_temp_directory();
428 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
429 return (jstring) JNIHandles::make_local(THREAD, h());
430 JVM_END
431
432 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
433 if (len < 0) {
434 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
435 }
436 elmClass->initialize(CHECK);
437 if (elmClass->is_array_klass() || elmClass->is_identity_class()) {
438 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
439 }
440 if (elmClass->is_abstract()) {
441 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
442 }
443 }
444
445 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
446 oop o = JNIHandles::resolve_non_null(orig);
447 assert(o->is_array(), "Must be");
448 oop array = nullptr;
449 arrayOop org = (arrayOop)o;
450 arrayHandle oh(THREAD, org);
451 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass());
452 InlineKlass* vk = InlineKlass::cast(ak->element_klass());
453 int len = to - from; // length of the new array
454 if (ak->is_null_free_array_klass()) {
455 if ((len != 0) && (from >= org->length() || to > org->length())) {
456 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
457 }
458 }
459 if (org->is_flatArray()) {
460 FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass());
461 LayoutKind lk = fak->layout_kind();
462 ArrayKlass::ArrayProperties props = ArrayKlass::array_properties_from_layout(lk);
463 array = oopFactory::new_flatArray(vk, len, props, lk, CHECK_NULL);
464 arrayHandle ah(THREAD, (arrayOop)array);
465 int end = to < oh()->length() ? to : oh()->length();
466 for (int i = from; i < end; i++) {
467 void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper());
468 void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper());
469 vk->copy_payload_to_addr(src, dst, lk, false);
470 }
471 array = ah();
472 } else {
473 ArrayKlass::ArrayProperties props = org->is_null_free_array() ? ArrayKlass::ArrayProperties::NULL_RESTRICTED : ArrayKlass::ArrayProperties::DEFAULT;
474 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL);
475 int end = to < oh()->length() ? to : oh()->length();
476 for (int i = from; i < end; i++) {
477 if (i < ((objArrayOop)oh())->length()) {
478 ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i));
479 } else {
480 assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
481 ((objArrayOop)array)->obj_at_put(i - from, nullptr);
482 }
483 }
484 }
485 return (jarray) JNIHandles::make_local(THREAD, array);
486 JVM_END
487
488 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
489 oop mirror = JNIHandles::resolve_non_null(elmClass);
490 oop init = JNIHandles::resolve(initVal);
491 if (init == nullptr) {
492 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
493 }
494 Handle init_h(THREAD, init);
495 Klass* klass = java_lang_Class::as_Klass(mirror);
496 if (klass != init_h()->klass()) {
497 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
498 }
499 validate_array_arguments(klass, len, CHECK_NULL);
500 InlineKlass* vk = InlineKlass::cast(klass);
501 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NON_ATOMIC | ArrayKlass::ArrayProperties::NULL_RESTRICTED);
502 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
503 for (int i = 0; i < len; i++) {
504 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
505 }
506 return (jarray) JNIHandles::make_local(THREAD, array);
507 JVM_END
508
509 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
510 oop mirror = JNIHandles::resolve_non_null(elmClass);
511 oop init = JNIHandles::resolve(initVal);
512 if (init == nullptr) {
513 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
514 }
515 Handle init_h(THREAD, init);
516 Klass* klass = java_lang_Class::as_Klass(mirror);
517 if (klass != init_h()->klass()) {
518 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
519 }
520 validate_array_arguments(klass, len, CHECK_NULL);
521 InlineKlass* vk = InlineKlass::cast(klass);
522 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED);
523 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
524 for (int i = 0; i < len; i++) {
525 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
526 }
527 return (jarray) JNIHandles::make_local(THREAD, array);
528 JVM_END
529
530 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
531 oop mirror = JNIHandles::resolve_non_null(elmClass);
532 Klass* klass = java_lang_Class::as_Klass(mirror);
533 klass->initialize(CHECK_NULL);
534 validate_array_arguments(klass, len, CHECK_NULL);
535 InlineKlass* vk = InlineKlass::cast(klass);
536 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::DEFAULT);
537 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
538 return (jarray) JNIHandles::make_local(THREAD, array);
539 JVM_END
540
541 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
542 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
543 return oop->is_flatArray();
544 JVM_END
545
546 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
547 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
548 return oop->is_null_free_array();
549 JVM_END
550
551 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
552 // There are multiple cases where an array can/must support atomic access:
553 // - the array is a reference array
554 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or NULL_FREE_ATOMIC_FLAT
555 // - the array is flat and its component type is naturally atomic
556 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
557 if (oop->is_refArray()) return true;
558 if (oop->is_flatArray()) {
559 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
560 if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) return true;
561 if (fak->element_klass()->is_naturally_atomic()) return true;
562 }
563 return false;
564 JVM_END
565
566 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
567
568 extern volatile jint vm_created;
569
570 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
571 EventShutdown event;
572 if (event.should_commit()) {
573 event.set_reason("Shutdown requested from Java");
574 event.commit();
575 }
576 JVM_END
577
578
579 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
580 before_exit(thread, true);
581 vm_exit(code);
582 JVM_END
583
584
585 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
586 if (!DisableExplicitGC) {
587 EventSystemGC event;
588 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
589 Universe::heap()->collect(GCCause::_java_lang_system_gc);
590 event.commit();
591 }
592 JVM_END
593
594
595 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
596 return Universe::heap()->millis_since_last_whole_heap_examined();
597 JVM_END
598
599
600 static inline jlong convert_size_t_to_jlong(size_t val) {
601 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
602 NOT_LP64 (return (jlong)val;)
603 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
604 }
605
606 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
607 size_t n = Universe::heap()->capacity();
608 return convert_size_t_to_jlong(n);
609 JVM_END
610
611
612 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
613 size_t n = Universe::heap()->unused();
614 return convert_size_t_to_jlong(n);
615 JVM_END
616
617
618 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
619 size_t n = Universe::heap()->max_capacity();
620 return convert_size_t_to_jlong(n);
621 JVM_END
622
623
624 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
625 return os::active_processor_count();
626 JVM_END
627
628 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
629 #ifdef LINUX
630 if (UseContainerSupport) {
631 return JNI_TRUE;
632 }
633 #endif
634 return JNI_FALSE;
635 JVM_END
636
637 JVM_LEAF(jboolean, JVM_IsContainerized(void))
638 #ifdef LINUX
639 if (OSContainer::is_containerized()) {
640 return JNI_TRUE;
641 }
642 #endif
643 return JNI_FALSE;
644 JVM_END
645
646 // java.lang.Throwable //////////////////////////////////////////////////////
647
648 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
649 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
650 java_lang_Throwable::fill_in_stack_trace(exception);
651 JVM_END
652
653 // java.lang.NullPointerException ///////////////////////////////////////////
654
655 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
656 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
657
658 oop exc = JNIHandles::resolve_non_null(throwable);
659
660 Method* method;
661 int bci;
662 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
663 return nullptr;
664 }
665 if (method->is_native()) {
666 return nullptr;
667 }
668
669 stringStream ss;
670 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
671 if (ok) {
672 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
673 return (jstring) JNIHandles::make_local(THREAD, result);
674 } else {
675 return nullptr;
676 }
677 JVM_END
678
679 // java.lang.StackTraceElement //////////////////////////////////////////////
680
681
682 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
683 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
684 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
685 objArrayHandle stack_trace(THREAD, st);
686 // Fill in the allocated stack trace
687 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
688 JVM_END
689
690
691 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
692 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
693 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
694 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
695 JVM_END
696
697
698 // java.lang.StackWalker //////////////////////////////////////////////////////
699 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
700 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
701
702 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
703 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
704 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
705 if (!have_name) {
706 oop name = StringTable::intern(method->name(), CHECK);
707 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
708 }
709 if (!have_type) {
710 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
711 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
712 }
713 JVM_END
714
715 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
716 jint skip_frames, jobject contScope, jobject cont,
717 jint buffer_size, jint start_index, jobjectArray frames))
718 if (!thread->has_last_Java_frame()) {
719 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
720 }
721
722 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
723 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
724 Handle cont_h(THREAD, JNIHandles::resolve(cont));
725 // frames array is a ClassFrameInfo[] array when only getting caller reference,
726 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
727 // be null.
728 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
729 objArrayHandle frames_array_h(THREAD, fa);
730
731 if (frames_array_h->length() < buffer_size) {
732 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
733 }
734
735 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
736 buffer_size, start_index, frames_array_h, CHECK_NULL);
737 return JNIHandles::make_local(THREAD, result);
738 JVM_END
739
740
741 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
742 jint last_batch_count, jint buffer_size, jint start_index,
743 jobjectArray frames))
744 // frames array is a ClassFrameInfo[] array when only getting caller reference,
745 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
746 // be null.
747 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
748 objArrayHandle frames_array_h(THREAD, fa);
749
750 if (frames_array_h->length() < buffer_size) {
751 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
752 }
753
754 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
755 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
756 start_index, frames_array_h, THREAD);
757 JVM_END
758
759 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
760 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
761 objArrayHandle frames_array_h(THREAD, fa);
762 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
763 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
764
765 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
766 JVM_END
767
768 // java.lang.Object ///////////////////////////////////////////////
769
770
771 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
772 // as implemented in the classic virtual machine; return 0 if object is null
773 if (handle == nullptr) {
774 return 0;
775 }
776 oop obj = JNIHandles::resolve_non_null(handle);
777 if (Arguments::is_valhalla_enabled() && obj->klass()->is_inline_klass()) {
778 // Check if mark word contains hash code already
779 intptr_t hash = obj->mark().hash();
780 if (hash != markWord::no_hash) {
781 return checked_cast<jint>(hash);
782 }
783
784 // Compute hash by calling ValueObjectMethods.valueObjectHashCode
785 JavaValue result(T_INT);
786 JavaCallArguments args;
787 Handle ho(THREAD, obj);
788 args.push_oop(ho);
789 methodHandle method(THREAD, UseAltSubstitutabilityMethod
790 ? Universe::value_object_hash_codeAlt_method() : Universe::value_object_hash_code_method());
791 JavaCalls::call(&result, method, &args, THREAD);
792 if (HAS_PENDING_EXCEPTION) {
793 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
794 Handle e(THREAD, PENDING_EXCEPTION);
795 CLEAR_PENDING_EXCEPTION;
796 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
797 }
798 }
799 hash = result.get_jint();
800
801 // Store hash in the mark word
802 markWord old_mark, new_mark, test;
803 do {
804 old_mark = ho->mark();
805 new_mark = old_mark.copy_set_hash(hash);
806 test = ho->cas_set_mark(new_mark, old_mark);
807 } while (test != old_mark);
808
809 return checked_cast<jint>(new_mark.hash());
810 } else {
811 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
812 }
813 JVM_END
814
815
816 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
817 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
818 ObjectSynchronizer::wait(obj, ms, CHECK);
819 JVM_END
820
821
822 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
823 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
824 ObjectSynchronizer::notify(obj, CHECK);
825 JVM_END
826
827
828 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
829 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
830 ObjectSynchronizer::notifyall(obj, CHECK);
831 JVM_END
832
833
834 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
835 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
836 Klass* klass = obj->klass();
837 JvmtiVMObjectAllocEventCollector oam;
838
839 #ifdef ASSERT
840 // Just checking that the cloneable flag is set correct
841 if (obj->is_array()) {
842 guarantee(klass->is_cloneable(), "all arrays are cloneable");
843 } else {
844 guarantee(obj->is_instance(), "should be instanceOop");
845 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
846 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
847 }
848 #endif
849
850 // Check if class of obj supports the Cloneable interface.
851 // All arrays are considered to be cloneable (See JLS 20.1.5).
852 // All j.l.r.Reference classes are considered non-cloneable.
853 if (!klass->is_cloneable() ||
854 (klass->is_instance_klass() &&
855 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
856 ResourceMark rm(THREAD);
857 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
858 }
859
860 if (klass->is_inline_klass()) {
861 // Value instances have no identity, so return the current instance instead of allocating a new one
862 // Value classes cannot have finalizers, so the method can return immediately
863 return JNIHandles::make_local(THREAD, obj());
864 }
865
866 // Make shallow object copy
867 const size_t size = obj->size();
868 oop new_obj_oop = nullptr;
869 if (obj->is_array()) {
870 const int length = ((arrayOop)obj())->length();
871 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
872 /* do_zero */ true, CHECK_NULL);
873 } else {
874 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
875 }
876
877 HeapAccess<>::clone(obj(), new_obj_oop, size);
878
879 Handle new_obj(THREAD, new_obj_oop);
880 // Caution: this involves a java upcall, so the clone should be
881 // "gc-robust" by this stage.
882 if (klass->has_finalizer()) {
883 assert(obj->is_instance(), "should be instanceOop");
884 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
885 new_obj = Handle(THREAD, new_obj_oop);
886 }
887
888 return JNIHandles::make_local(THREAD, new_obj());
889 JVM_END
890
891 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
892
893 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
894 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
895 JVM_END
896
897 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
898 return InstanceKlass::is_finalization_enabled();
899 JVM_END
900
901 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
902
903 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
904 CONT_RegisterNativeMethods(env, cls);
905 JVM_END
906
907 // java.io.File ///////////////////////////////////////////////////////////////
908
909 JVM_LEAF(char*, JVM_NativePath(char* path))
910 return os::native_path(path);
911 JVM_END
912
913
914 // Misc. class handling ///////////////////////////////////////////////////////////
915
916
917 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
918 // Getting the class of the caller frame.
919 //
920 // The call stack at this point looks something like this:
921 //
922 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
923 // [1] [ @CallerSensitive API.method ]
924 // [.] [ (skipped intermediate frames) ]
925 // [n] [ caller ]
926 vframeStream vfst(thread);
927 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
928 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
929 Method* m = vfst.method();
930 assert(m != nullptr, "sanity");
931 switch (n) {
932 case 0:
933 // This must only be called from Reflection.getCallerClass
934 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
935 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
936 }
937 // fall-through
938 case 1:
939 // Frame 0 and 1 must be caller sensitive.
940 if (!m->caller_sensitive()) {
941 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
942 }
943 break;
944 default:
945 if (!m->is_ignored_by_security_stack_walk()) {
946 // We have reached the desired frame; return the holder class.
947 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
948 }
949 break;
950 }
951 }
952 return nullptr;
953 JVM_END
954
955
956 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
957 oop mirror = nullptr;
958 BasicType t = name2type(utf);
959 if (t != T_ILLEGAL && !is_reference_type(t)) {
960 mirror = Universe::java_mirror(t);
961 }
962 if (mirror == nullptr) {
963 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
964 } else {
965 return (jclass) JNIHandles::make_local(THREAD, mirror);
966 }
967 JVM_END
968
969
970 // Returns a class loaded by the bootstrap class loader; or null
971 // if not found. ClassNotFoundException is not thrown.
972 // FindClassFromBootLoader is exported to the launcher for windows.
973 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
974 const char* name))
975 // Java libraries should ensure that name is never null or illegal.
976 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
977 // It's impossible to create this class; the name cannot fit
978 // into the constant pool.
979 return nullptr;
980 }
981 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
982
983 TempNewSymbol h_name = SymbolTable::new_symbol(name);
984 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
985 if (k == nullptr) {
986 return nullptr;
987 }
988
989 if (log_is_enabled(Debug, class, resolve)) {
990 trace_class_resolution(k);
991 }
992 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
993 JVM_END
994
995 // Find a class with this name in this loader.
996 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
997 jboolean init, jobject loader))
998 TempNewSymbol h_name =
999 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1000 CHECK_NULL);
1001
1002 oop loader_oop = JNIHandles::resolve(loader);
1003 Handle h_loader(THREAD, loader_oop);
1004
1005 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1006 false, THREAD);
1007
1008 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1009 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1010 }
1011 return result;
1012 JVM_END
1013
1014 // Currently only called from the old verifier.
1015 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1016 jboolean init, jclass from))
1017 TempNewSymbol h_name =
1018 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1019 CHECK_NULL);
1020 oop from_class_oop = JNIHandles::resolve(from);
1021 assert(from_class_oop != nullptr, "must be");
1022 Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
1023 assert(from_class != nullptr, "must be");
1024 oop 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 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1033 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1034 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1035 }
1036
1037 #if INCLUDE_CDS
1038 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1039 InstanceKlass* ik = InstanceKlass::cast(from_class);
1040 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1041 }
1042 #endif
1043
1044 return result;
1045 JVM_END
1046
1047 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1048 static jclass jvm_define_class_common(const char *name,
1049 jobject loader, const jbyte *buf,
1050 jsize len, jobject pd, const char *source,
1051 TRAPS) {
1052 if (source == nullptr) source = "__JVM_DefineClass__";
1053
1054 JavaThread* jt = THREAD;
1055
1056 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1057 ClassLoader::perf_define_appclass_selftime(),
1058 ClassLoader::perf_define_appclasses(),
1059 jt->get_thread_stat()->perf_recursion_counts_addr(),
1060 jt->get_thread_stat()->perf_timers_addr(),
1061 PerfClassTraceTime::DEFINE_CLASS);
1062
1063 if (UsePerfData) {
1064 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1065 }
1066
1067 // Class resolution will get the class name from the .class stream if the name is null.
1068 TempNewSymbol class_name = name == nullptr ? nullptr :
1069 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1070 CHECK_NULL);
1071
1072 ResourceMark rm(THREAD);
1073 ClassFileStream st((u1*)buf, len, source);
1074 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1075 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1076 ClassLoadInfo cl_info(protection_domain);
1077 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1078 class_loader,
1079 cl_info,
1080 CHECK_NULL);
1081
1082 if (log_is_enabled(Debug, class, resolve)) {
1083 trace_class_resolution(k);
1084 }
1085
1086 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1087 }
1088
1089 enum {
1090 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1091 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1092 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1093 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1094 };
1095
1096 /*
1097 * Define a class with the specified flags that indicates if it's a nestmate,
1098 * hidden, or strongly referenced from class loader.
1099 */
1100 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1101 const jbyte *buf, jsize len, jobject pd,
1102 jboolean init, int flags, jobject classData, TRAPS) {
1103 ResourceMark rm(THREAD);
1104
1105 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1106 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1107 if (lookup_k == nullptr) {
1108 // The error message is wrong. We come here only if lookup is a primitive class
1109 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1110 }
1111
1112 Handle class_loader (THREAD, lookup_k->class_loader());
1113
1114 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1115 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1116 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1117 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1118
1119 InstanceKlass* host_class = nullptr;
1120 if (is_nestmate) {
1121 host_class = lookup_k->nest_host(CHECK_NULL);
1122 }
1123
1124 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1125 name,
1126 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1127 is_nestmate ? host_class->external_name() : "",
1128 is_hidden ? "hidden" : "not hidden",
1129 is_strong ? "strong" : "weak",
1130 vm_annotations ? "with vm annotations" : "without vm annotation");
1131
1132 if (!is_hidden) {
1133 // classData is only applicable for hidden classes
1134 if (classData != nullptr) {
1135 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1136 }
1137 if (is_nestmate) {
1138 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1139 }
1140 if (!is_strong) {
1141 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1142 }
1143 if (vm_annotations) {
1144 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1145 }
1146 if (flags != STRONG_LOADER_LINK) {
1147 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1148 err_msg("invalid flag 0x%x", flags));
1149 }
1150 }
1151
1152 // Class resolution will get the class name from the .class stream if the name is null.
1153 TempNewSymbol class_name = name == nullptr ? nullptr :
1154 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1155 CHECK_NULL);
1156
1157 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1158 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1159 ClassFileStream st((u1*)buf, len, source);
1160
1161 InstanceKlass* ik = nullptr;
1162 if (!is_hidden) {
1163 ClassLoadInfo cl_info(protection_domain);
1164 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1165 class_loader,
1166 cl_info,
1167 CHECK_NULL);
1168
1169 if (log_is_enabled(Debug, class, resolve)) {
1170 trace_class_resolution(ik);
1171 }
1172 } else { // hidden
1173 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1174 ClassLoadInfo cl_info(protection_domain,
1175 host_class,
1176 classData_h,
1177 is_hidden,
1178 is_strong,
1179 vm_annotations);
1180 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1181 class_loader,
1182 cl_info,
1183 CHECK_NULL);
1184
1185 // The hidden class loader data has been artificially been kept alive to
1186 // this point. The mirror and any instances of this class have to keep
1187 // it alive afterwards.
1188 ik->class_loader_data()->dec_keep_alive_ref_count();
1189
1190 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1191 ModuleEntry* module = ik->module();
1192 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1193 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1194 module_name,
1195 ik->external_name(),
1196 host_class->external_name(),
1197 ik->is_hidden() ? "is hidden" : "is not hidden");
1198 }
1199 }
1200
1201 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1202 // non-hidden class or nestmate class must be in the same package as the Lookup class
1203 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1204 }
1205
1206 if (init) {
1207 ik->initialize(CHECK_NULL);
1208 } else {
1209 ik->link_class(CHECK_NULL);
1210 }
1211
1212 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1213 }
1214
1215 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1216 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1217 JVM_END
1218
1219 /*
1220 * Define a class with the specified lookup class.
1221 * lookup: Lookup class
1222 * name: the name of the class
1223 * buf: class bytes
1224 * len: length of class bytes
1225 * pd: protection domain
1226 * init: initialize the class
1227 * flags: properties of the class
1228 * classData: private static pre-initialized field
1229 */
1230 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1231 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1232
1233 if (lookup == nullptr) {
1234 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1235 }
1236
1237 assert(buf != nullptr, "buf must not be null");
1238
1239 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1240 JVM_END
1241
1242 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1243
1244 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1245 JVM_END
1246
1247 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1248 ResourceMark rm(THREAD);
1249
1250 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1251 char* str = java_lang_String::as_utf8_string(h_name());
1252
1253 // Sanity check, don't expect null
1254 if (str == nullptr) return nullptr;
1255
1256 // Internalize the string, converting '.' to '/' in string.
1257 char* p = (char*)str;
1258 while (*p != '\0') {
1259 if (*p == '.') {
1260 *p = '/';
1261 }
1262 p++;
1263 }
1264
1265 const int str_len = (int)(p - str);
1266 if (str_len > Symbol::max_length()) {
1267 // It's impossible to create this class; the name cannot fit
1268 // into the constant pool.
1269 return nullptr;
1270 }
1271 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1272
1273 // Security Note:
1274 // The Java level wrapper will perform the necessary security check allowing
1275 // us to pass the null as the initiating class loader.
1276 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1277 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1278 #if INCLUDE_CDS
1279 if (k == nullptr) {
1280 // If the class is not already loaded, try to see if it's in the shared
1281 // archive for the current classloader (h_loader).
1282 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1283 }
1284 #endif
1285 return (k == nullptr) ? nullptr :
1286 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1287 JVM_END
1288
1289 // Module support //////////////////////////////////////////////////////////////////////////////
1290
1291 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1292 jstring location, jobjectArray packages))
1293 Handle h_module (THREAD, JNIHandles::resolve(module));
1294 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1295 JVM_END
1296
1297 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1298 Handle h_module (THREAD, JNIHandles::resolve(module));
1299 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1300 JVM_END
1301
1302 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1303 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1304 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1305 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1306 JVM_END
1307
1308 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1309 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1310 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1311 JVM_END
1312
1313 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1314 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1315 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1316 JVM_END
1317
1318 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1319 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1320 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1321 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1322 JVM_END
1323
1324 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1325 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1326 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1327 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1328 JVM_END
1329
1330 // Reflection support //////////////////////////////////////////////////////////////////////////////
1331
1332 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1333 assert (cls != nullptr, "illegal class");
1334 JvmtiVMObjectAllocEventCollector oam;
1335 ResourceMark rm(THREAD);
1336 HandleMark hm(THREAD);
1337 Handle java_class(THREAD, JNIHandles::resolve(cls));
1338 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1339 return (jstring) JNIHandles::make_local(THREAD, result);
1340 JVM_END
1341
1342
1343 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1344 JvmtiVMObjectAllocEventCollector oam;
1345 oop mirror = JNIHandles::resolve_non_null(cls);
1346
1347 // Special handling for primitive objects
1348 if (java_lang_Class::is_primitive(mirror)) {
1349 // Primitive objects does not have any interfaces
1350 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1351 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1352 }
1353
1354 Klass* klass = java_lang_Class::as_Klass(mirror);
1355 // Figure size of result array
1356 int size;
1357 if (klass->is_instance_klass()) {
1358 InstanceKlass* ik = InstanceKlass::cast(klass);
1359 size = ik->local_interfaces()->length();
1360 } else {
1361 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1362 size = 2;
1363 }
1364
1365 // Allocate result array
1366 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1367 objArrayHandle result (THREAD, r);
1368 // Fill in result
1369 if (klass->is_instance_klass()) {
1370 // Regular instance klass, fill in all local interfaces
1371 for (int index = 0; index < size; index++) {
1372 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1373 result->obj_at_put(index, k->java_mirror());
1374 }
1375 } else {
1376 // All arrays implement java.lang.Cloneable and java.io.Serializable
1377 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1378 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1379 }
1380 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1381 JVM_END
1382
1383
1384 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1385 oop mirror = JNIHandles::resolve_non_null(cls);
1386 if (java_lang_Class::is_primitive(mirror)) {
1387 return JNI_FALSE;
1388 }
1389 Klass* k = java_lang_Class::as_Klass(mirror);
1390 return k->is_hidden();
1391 JVM_END
1392
1393
1394 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1395 ResourceMark rm(THREAD);
1396 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1397 JvmtiVMObjectAllocEventCollector oam;
1398
1399 // Iterate through Java frames
1400 vframeStream vfst(thread);
1401 for(; !vfst.at_end(); vfst.next()) {
1402 int loc = -1;
1403 // get method of frame
1404 Method* method = vfst.method();
1405
1406 Symbol *name = method->name();
1407
1408 InstanceKlass* holder = method->method_holder();
1409 if (name == vmSymbols::runWith_method_name()) {
1410 if (holder == vmClasses::Thread_klass()
1411 || holder == vmClasses::ScopedValue_Carrier_klass()) {
1412 loc = 1;
1413 }
1414 }
1415
1416 if (loc != -1) {
1417 javaVFrame *frame = vfst.asJavaVFrame();
1418 StackValueCollection* locals = frame->locals();
1419 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1420 Handle result = head_sv->get_obj();
1421 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1422 if (result() != nullptr) {
1423 return JNIHandles::make_local(THREAD, result());
1424 }
1425 }
1426 }
1427
1428 return nullptr;
1429 JVM_END
1430
1431 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1432 JvmtiVMObjectAllocEventCollector oam;
1433 // ofClass is a reference to a java_lang_Class object. The mirror object
1434 // of an InstanceKlass
1435 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1436 if (java_lang_Class::is_primitive(ofMirror) ||
1437 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1438 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1439 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1440 }
1441
1442 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1443 InnerClassesIterator iter(k);
1444
1445 if (iter.length() == 0) {
1446 // Neither an inner nor outer class
1447 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1448 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1449 }
1450
1451 // find inner class info
1452 constantPoolHandle cp(thread, k->constants());
1453 int length = iter.length();
1454
1455 // Allocate temp. result array
1456 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1457 objArrayHandle result (THREAD, r);
1458 int members = 0;
1459
1460 for (; !iter.done(); iter.next()) {
1461 int ioff = iter.inner_class_info_index();
1462 int ooff = iter.outer_class_info_index();
1463
1464 if (ioff != 0 && ooff != 0) {
1465 // Check to see if the name matches the class we're looking for
1466 // before attempting to find the class.
1467 if (cp->klass_name_at_matches(k, ooff)) {
1468 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1469 if (outer_klass == k) {
1470 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1471 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1472
1473 // Throws an exception if outer klass has not declared k as
1474 // an inner klass
1475 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1476
1477 result->obj_at_put(members, inner_klass->java_mirror());
1478 members++;
1479 }
1480 }
1481 }
1482 }
1483
1484 if (members != length) {
1485 // Return array of right length
1486 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1487 for(int i = 0; i < members; i++) {
1488 res->obj_at_put(i, result->obj_at(i));
1489 }
1490 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1491 }
1492
1493 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1494 JVM_END
1495
1496
1497 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1498 {
1499 // ofClass is a reference to a java_lang_Class object.
1500 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1501 if (java_lang_Class::is_primitive(ofMirror)) {
1502 return nullptr;
1503 }
1504 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1505 if (!klass->is_instance_klass()) {
1506 return nullptr;
1507 }
1508
1509 bool inner_is_member = false;
1510 Klass* outer_klass
1511 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1512 if (outer_klass == nullptr) return nullptr; // already a top-level class
1513 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1514 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1515 }
1516 JVM_END
1517
1518 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1519 {
1520 oop mirror = JNIHandles::resolve_non_null(cls);
1521 if (java_lang_Class::is_primitive(mirror)) {
1522 return nullptr;
1523 }
1524 Klass* klass = java_lang_Class::as_Klass(mirror);
1525 if (!klass->is_instance_klass()) {
1526 return nullptr;
1527 }
1528 InstanceKlass* k = InstanceKlass::cast(klass);
1529 int ooff = 0, noff = 0;
1530 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1531 if (noff != 0) {
1532 constantPoolHandle i_cp(thread, k->constants());
1533 Symbol* name = i_cp->symbol_at(noff);
1534 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1535 return (jstring) JNIHandles::make_local(THREAD, str());
1536 }
1537 }
1538 return nullptr;
1539 }
1540 JVM_END
1541
1542 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1543 assert (cls != nullptr, "illegal class");
1544 JvmtiVMObjectAllocEventCollector oam;
1545 ResourceMark rm(THREAD);
1546 oop mirror = JNIHandles::resolve_non_null(cls);
1547 // Return null for arrays and primitives
1548 if (!java_lang_Class::is_primitive(mirror)) {
1549 Klass* k = java_lang_Class::as_Klass(mirror);
1550 if (k->is_instance_klass()) {
1551 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1552 if (sym == nullptr) return nullptr;
1553 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1554 return (jstring) JNIHandles::make_local(THREAD, str());
1555 }
1556 }
1557 return nullptr;
1558 JVM_END
1559
1560
1561 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1562 assert (cls != nullptr, "illegal class");
1563 oop mirror = JNIHandles::resolve_non_null(cls);
1564 // Return null for arrays and primitives
1565 if (!java_lang_Class::is_primitive(mirror)) {
1566 Klass* k = java_lang_Class::as_Klass(mirror);
1567 if (k->is_instance_klass()) {
1568 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1569 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1570 }
1571 }
1572 return nullptr;
1573 JVM_END
1574
1575
1576 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1577 // some of this code was adapted from from jni_FromReflectedField
1578
1579 oop reflected = JNIHandles::resolve_non_null(field);
1580 oop mirror = java_lang_reflect_Field::clazz(reflected);
1581 int slot = java_lang_reflect_Field::slot(reflected);
1582 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1583
1584 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1585 int offset = ik->field_offset(slot);
1586
1587 if (modifiers & JVM_ACC_STATIC) {
1588 // for static fields we only look in the current class
1589 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1590 assert(false, "cannot find static field");
1591 return false;
1592 }
1593 } else {
1594 // for instance fields we start with the current class and work
1595 // our way up through the superclass chain
1596 if (!ik->find_field_from_offset(offset, false, &fd)) {
1597 assert(false, "cannot find instance field");
1598 return false;
1599 }
1600 }
1601 return true;
1602 }
1603
1604 static Method* jvm_get_method_common(jobject method) {
1605 // some of this code was adapted from from jni_FromReflectedMethod
1606
1607 oop reflected = JNIHandles::resolve_non_null(method);
1608 oop mirror = nullptr;
1609 int slot = 0;
1610
1611 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1612 mirror = java_lang_reflect_Constructor::clazz(reflected);
1613 slot = java_lang_reflect_Constructor::slot(reflected);
1614 } else {
1615 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1616 "wrong type");
1617 mirror = java_lang_reflect_Method::clazz(reflected);
1618 slot = java_lang_reflect_Method::slot(reflected);
1619 }
1620 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1621
1622 Method* m = ik->method_with_idnum(slot);
1623 assert(m != nullptr, "cannot find method");
1624 return m; // caller has to deal with null in product mode
1625 }
1626
1627 /* Type use annotations support (JDK 1.8) */
1628
1629 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1630 assert (cls != nullptr, "illegal class");
1631 ResourceMark rm(THREAD);
1632 // Return null for arrays and primitives
1633 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1634 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1635 if (k->is_instance_klass()) {
1636 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1637 if (type_annotations != nullptr) {
1638 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1639 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1640 }
1641 }
1642 }
1643 return nullptr;
1644 JVM_END
1645
1646 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1647 assert (method != nullptr, "illegal method");
1648 // method is a handle to a java.lang.reflect.Method object
1649 Method* m = jvm_get_method_common(method);
1650 if (m == nullptr) {
1651 return nullptr;
1652 }
1653
1654 AnnotationArray* type_annotations = m->type_annotations();
1655 if (type_annotations != nullptr) {
1656 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1657 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1658 }
1659
1660 return nullptr;
1661 JVM_END
1662
1663 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1664 assert (field != nullptr, "illegal field");
1665 fieldDescriptor fd;
1666 bool gotFd = jvm_get_field_common(field, fd);
1667 if (!gotFd) {
1668 return nullptr;
1669 }
1670
1671 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1672 JVM_END
1673
1674 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1675 if (!cp->is_within_bounds(index)) {
1676 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1677 }
1678 }
1679
1680 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1681 {
1682 // method is a handle to a java.lang.reflect.Method object
1683 Method* method_ptr = jvm_get_method_common(method);
1684 methodHandle mh (THREAD, method_ptr);
1685 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1686 const int num_params = mh->method_parameters_length();
1687
1688 if (num_params < 0) {
1689 // A -1 return value from method_parameters_length means there is no
1690 // parameter data. Return null to indicate this to the reflection
1691 // API.
1692 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1693 return (jobjectArray)nullptr;
1694 } else {
1695 // Otherwise, we return something up to reflection, even if it is
1696 // a zero-length array. Why? Because in some cases this can
1697 // trigger a MalformedParametersException.
1698
1699 // make sure all the symbols are properly formatted
1700 for (int i = 0; i < num_params; i++) {
1701 MethodParametersElement* params = mh->method_parameters_start();
1702 int index = params[i].name_cp_index;
1703 constantPoolHandle cp(THREAD, mh->constants());
1704 bounds_check(cp, index, CHECK_NULL);
1705
1706 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1707 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1708 "Wrong type at constant pool index");
1709 }
1710
1711 }
1712
1713 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1714 objArrayHandle result (THREAD, result_oop);
1715
1716 for (int i = 0; i < num_params; i++) {
1717 MethodParametersElement* params = mh->method_parameters_start();
1718 // For a 0 index, give a null symbol
1719 Symbol* sym = 0 != params[i].name_cp_index ?
1720 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1721 int flags = params[i].flags;
1722 oop param = Reflection::new_parameter(reflected_method, i, sym,
1723 flags, CHECK_NULL);
1724 result->obj_at_put(i, param);
1725 }
1726 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1727 }
1728 }
1729 JVM_END
1730
1731 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1732
1733 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1734 {
1735 JvmtiVMObjectAllocEventCollector oam;
1736
1737 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1738 // Exclude primitive types and array types
1739 if (java_lang_Class::is_primitive(ofMirror) ||
1740 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1741 // Return empty array
1742 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1743 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1744 }
1745
1746 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1747 constantPoolHandle cp(THREAD, k->constants());
1748
1749 // Ensure class is linked
1750 k->link_class(CHECK_NULL);
1751
1752 // Allocate result
1753 int num_fields;
1754
1755 if (publicOnly) {
1756 num_fields = 0;
1757 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1758 if (fs.access_flags().is_public()) ++num_fields;
1759 }
1760 } else {
1761 num_fields = k->java_fields_count();
1762 }
1763
1764 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1765 objArrayHandle result (THREAD, r);
1766
1767 int out_idx = 0;
1768 fieldDescriptor fd;
1769 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1770 if (!publicOnly || fs.access_flags().is_public()) {
1771 fd.reinitialize(k, fs.to_FieldInfo());
1772 oop field = Reflection::new_field(&fd, CHECK_NULL);
1773 result->obj_at_put(out_idx, field);
1774 ++out_idx;
1775 }
1776 }
1777 assert(out_idx == num_fields, "just checking");
1778 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1779 }
1780 JVM_END
1781
1782 // A class is a record if and only if it is final and a direct subclass of
1783 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1784 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1785 {
1786 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1787 if (k != nullptr && k->is_instance_klass()) {
1788 InstanceKlass* ik = InstanceKlass::cast(k);
1789 return ik->is_record();
1790 } else {
1791 return false;
1792 }
1793 }
1794 JVM_END
1795
1796 // Returns an array containing the components of the Record attribute,
1797 // or null if the attribute is not present.
1798 //
1799 // Note that this function returns the components of the Record attribute
1800 // even if the class is not a record.
1801 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1802 {
1803 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1804
1805 Array<RecordComponent*>* components = ik->record_components();
1806 if (components != nullptr) {
1807 JvmtiVMObjectAllocEventCollector oam;
1808 constantPoolHandle cp(THREAD, ik->constants());
1809 int length = components->length();
1810 assert(length >= 0, "unexpected record_components length");
1811 objArrayOop record_components =
1812 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1813 objArrayHandle components_h (THREAD, record_components);
1814
1815 for (int x = 0; x < length; x++) {
1816 RecordComponent* component = components->at(x);
1817 assert(component != nullptr, "unexpected null record component");
1818 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1819 components_h->obj_at_put(x, component_oop);
1820 }
1821 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1822 }
1823
1824 return nullptr;
1825 }
1826 JVM_END
1827
1828 static jobjectArray get_class_declared_methods_helper(
1829 JNIEnv *env,
1830 jclass ofClass, jboolean publicOnly,
1831 bool want_constructor,
1832 Klass* klass, TRAPS) {
1833
1834 JvmtiVMObjectAllocEventCollector oam;
1835
1836 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1837 // Exclude primitive types and array types
1838 if (java_lang_Class::is_primitive(ofMirror)
1839 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1840 // Return empty array
1841 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1842 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1843 }
1844
1845 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1846
1847 // Ensure class is linked
1848 k->link_class(CHECK_NULL);
1849
1850 Array<Method*>* methods = k->methods();
1851 int methods_length = methods->length();
1852
1853 // Save original method_idnum in case of redefinition, which can change
1854 // the idnum of obsolete methods. The new method will have the same idnum
1855 // but if we refresh the methods array, the counts will be wrong.
1856 ResourceMark rm(THREAD);
1857 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1858 int num_methods = 0;
1859
1860 // Select methods matching the criteria.
1861 for (int i = 0; i < methods_length; i++) {
1862 Method* method = methods->at(i);
1863 if (want_constructor && !method->is_object_constructor()) {
1864 continue;
1865 }
1866 if (!want_constructor &&
1867 (method->is_object_constructor() || method->is_class_initializer() ||
1868 method->is_overpass())) {
1869 continue;
1870 }
1871 if (publicOnly && !method->is_public()) {
1872 continue;
1873 }
1874 idnums->push(method->method_idnum());
1875 ++num_methods;
1876 }
1877
1878 // Allocate result
1879 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1880 objArrayHandle result (THREAD, r);
1881
1882 // Now just put the methods that we selected above, but go by their idnum
1883 // in case of redefinition. The methods can be redefined at any safepoint,
1884 // so above when allocating the oop array and below when creating reflect
1885 // objects.
1886 for (int i = 0; i < num_methods; i++) {
1887 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1888 if (method.is_null()) {
1889 // Method may have been deleted and seems this API can handle null
1890 // Otherwise should probably put a method that throws NSME
1891 result->obj_at_put(i, nullptr);
1892 } else {
1893 oop m;
1894 if (want_constructor) {
1895 assert(method->is_object_constructor(), "must be");
1896 m = Reflection::new_constructor(method, CHECK_NULL);
1897 } else {
1898 m = Reflection::new_method(method, false, CHECK_NULL);
1899 }
1900 result->obj_at_put(i, m);
1901 }
1902 }
1903
1904 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1905 }
1906
1907 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1908 {
1909 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1910 /*want_constructor*/ false,
1911 vmClasses::reflect_Method_klass(), THREAD);
1912 }
1913 JVM_END
1914
1915 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1916 {
1917 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1918 /*want_constructor*/ true,
1919 vmClasses::reflect_Constructor_klass(), THREAD);
1920 }
1921 JVM_END
1922
1923 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1924 {
1925 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1926 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1927 return c->has_nestmate_access_to(m, THREAD);
1928 }
1929 JVM_END
1930
1931 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1932 {
1933 // current is not a primitive or array class
1934 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1935 InstanceKlass* host = c->nest_host(THREAD);
1936 return (jclass) (host == nullptr ? nullptr :
1937 JNIHandles::make_local(THREAD, host->java_mirror()));
1938 }
1939 JVM_END
1940
1941 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1942 {
1943 // current is not a primitive or array class
1944 ResourceMark rm(THREAD);
1945 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1946 InstanceKlass* host = c->nest_host(THREAD);
1947
1948 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1949 c->external_name(), host->external_name());
1950 {
1951 JvmtiVMObjectAllocEventCollector oam;
1952 Array<u2>* members = host->nest_members();
1953 int length = members == nullptr ? 0 : members->length();
1954
1955 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1956
1957 // nest host is first in the array so make it one bigger
1958 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1959 length + 1, CHECK_NULL);
1960 objArrayHandle result(THREAD, r);
1961 result->obj_at_put(0, host->java_mirror());
1962 if (length != 0) {
1963 int count = 0;
1964 for (int i = 0; i < length; i++) {
1965 int cp_index = members->at(i);
1966 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1967 if (HAS_PENDING_EXCEPTION) {
1968 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1969 return nullptr; // propagate VMEs
1970 }
1971 if (log_is_enabled(Trace, class, nestmates)) {
1972 stringStream ss;
1973 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1974 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1975 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1976 log_trace(class, nestmates)("%s", ss.as_string());
1977 }
1978 CLEAR_PENDING_EXCEPTION;
1979 continue;
1980 }
1981 if (k->is_instance_klass()) {
1982 InstanceKlass* ik = InstanceKlass::cast(k);
1983 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1984 if (nest_host_k == host) {
1985 result->obj_at_put(count+1, k->java_mirror());
1986 count++;
1987 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1988 } else {
1989 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1990 ik->external_name(), nest_host_k->external_name());
1991 }
1992 } else {
1993 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1994 k->external_name());
1995 }
1996 }
1997 if (count < length) {
1998 // we had invalid entries so we need to compact the array
1999 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2000 length + 1, count + 1);
2001
2002 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2003 count + 1, CHECK_NULL);
2004 objArrayHandle result2(THREAD, r2);
2005 for (int i = 0; i < count + 1; i++) {
2006 result2->obj_at_put(i, result->obj_at(i));
2007 }
2008 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2009 }
2010 }
2011 else {
2012 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
2013 }
2014 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2015 }
2016 }
2017 JVM_END
2018
2019 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2020 {
2021 oop mirror = JNIHandles::resolve_non_null(current);
2022 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2023 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2024
2025 ResourceMark rm(THREAD);
2026 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2027 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2028 if (ik->is_sealed()) {
2029 JvmtiVMObjectAllocEventCollector oam;
2030 Array<u2>* subclasses = ik->permitted_subclasses();
2031 int length = subclasses->length();
2032
2033 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2034
2035 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2036 length, CHECK_NULL);
2037 objArrayHandle result(THREAD, r);
2038 int count = 0;
2039 for (int i = 0; i < length; i++) {
2040 int cp_index = subclasses->at(i);
2041 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2042 if (HAS_PENDING_EXCEPTION) {
2043 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2044 return nullptr; // propagate VMEs
2045 }
2046 if (log_is_enabled(Trace, class, sealed)) {
2047 stringStream ss;
2048 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2049 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2050 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2051 log_trace(class, sealed)("%s", ss.as_string());
2052 }
2053
2054 CLEAR_PENDING_EXCEPTION;
2055 continue;
2056 }
2057 if (k->is_instance_klass()) {
2058 result->obj_at_put(count++, k->java_mirror());
2059 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2060 }
2061 }
2062 if (count < length) {
2063 // we had invalid entries so we need to compact the array
2064 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2065 count, CHECK_NULL);
2066 objArrayHandle result2(THREAD, r2);
2067 for (int i = 0; i < count; i++) {
2068 result2->obj_at_put(i, result->obj_at(i));
2069 }
2070 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2071 }
2072 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2073 } else {
2074 return nullptr;
2075 }
2076 }
2077 JVM_END
2078
2079 // Constant pool access //////////////////////////////////////////////////////////
2080
2081 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2082 {
2083 JvmtiVMObjectAllocEventCollector oam;
2084 oop mirror = JNIHandles::resolve_non_null(cls);
2085 // Return null for primitives and arrays
2086 if (!java_lang_Class::is_primitive(mirror)) {
2087 Klass* k = java_lang_Class::as_Klass(mirror);
2088 if (k->is_instance_klass()) {
2089 InstanceKlass* k_h = InstanceKlass::cast(k);
2090 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2091 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2092 return JNIHandles::make_local(THREAD, jcp());
2093 }
2094 }
2095 return nullptr;
2096 }
2097 JVM_END
2098
2099
2100 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2101 {
2102 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2103 return cp->length();
2104 }
2105 JVM_END
2106
2107
2108 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2109 {
2110 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2111 bounds_check(cp, index, CHECK_NULL);
2112 constantTag tag = cp->tag_at(index);
2113 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2114 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2115 }
2116 Klass* k = cp->klass_at(index, CHECK_NULL);
2117 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2118 }
2119 JVM_END
2120
2121 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2122 {
2123 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2124 bounds_check(cp, index, CHECK_NULL);
2125 constantTag tag = cp->tag_at(index);
2126 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2127 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2128 }
2129 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2130 if (k == nullptr) return nullptr;
2131 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2132 }
2133 JVM_END
2134
2135 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2136 constantTag tag = cp->tag_at(index);
2137 if (!tag.is_method() && !tag.is_interface_method()) {
2138 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2139 }
2140 int klass_ref = cp->uncached_klass_ref_index_at(index);
2141 Klass* k_o;
2142 if (force_resolution) {
2143 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2144 } else {
2145 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2146 if (k_o == nullptr) return nullptr;
2147 }
2148 InstanceKlass* k = InstanceKlass::cast(k_o);
2149 Symbol* name = cp->uncached_name_ref_at(index);
2150 Symbol* sig = cp->uncached_signature_ref_at(index);
2151 methodHandle m (THREAD, k->find_method(name, sig));
2152 if (m.is_null()) {
2153 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2154 }
2155 oop method;
2156 if (m->is_object_constructor()) {
2157 method = Reflection::new_constructor(m, CHECK_NULL);
2158 } else {
2159 method = Reflection::new_method(m, true, CHECK_NULL);
2160 }
2161 return JNIHandles::make_local(THREAD, method);
2162 }
2163
2164 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2165 {
2166 JvmtiVMObjectAllocEventCollector oam;
2167 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2168 bounds_check(cp, index, CHECK_NULL);
2169 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2170 return res;
2171 }
2172 JVM_END
2173
2174 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2175 {
2176 JvmtiVMObjectAllocEventCollector oam;
2177 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2178 bounds_check(cp, index, CHECK_NULL);
2179 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2180 return res;
2181 }
2182 JVM_END
2183
2184 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2185 constantTag tag = cp->tag_at(index);
2186 if (!tag.is_field()) {
2187 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2188 }
2189 int klass_ref = cp->uncached_klass_ref_index_at(index);
2190 Klass* k_o;
2191 if (force_resolution) {
2192 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2193 } else {
2194 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2195 if (k_o == nullptr) return nullptr;
2196 }
2197 InstanceKlass* k = InstanceKlass::cast(k_o);
2198 Symbol* name = cp->uncached_name_ref_at(index);
2199 Symbol* sig = cp->uncached_signature_ref_at(index);
2200 fieldDescriptor fd;
2201 Klass* target_klass = k->find_field(name, sig, &fd);
2202 if (target_klass == nullptr) {
2203 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2204 }
2205 oop field = Reflection::new_field(&fd, CHECK_NULL);
2206 return JNIHandles::make_local(THREAD, field);
2207 }
2208
2209 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2210 {
2211 JvmtiVMObjectAllocEventCollector oam;
2212 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2213 bounds_check(cp, index, CHECK_NULL);
2214 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2215 return res;
2216 }
2217 JVM_END
2218
2219 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2220 {
2221 JvmtiVMObjectAllocEventCollector oam;
2222 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2223 bounds_check(cp, index, CHECK_NULL);
2224 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2225 return res;
2226 }
2227 JVM_END
2228
2229 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2230 {
2231 JvmtiVMObjectAllocEventCollector oam;
2232 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2233 bounds_check(cp, index, CHECK_NULL);
2234 constantTag tag = cp->tag_at(index);
2235 if (!tag.is_field_or_method()) {
2236 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2237 }
2238 int klass_ref = cp->uncached_klass_ref_index_at(index);
2239 Symbol* klass_name = cp->klass_name_at(klass_ref);
2240 Symbol* member_name = cp->uncached_name_ref_at(index);
2241 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2242 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2243 objArrayHandle dest(THREAD, dest_o);
2244 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2245 dest->obj_at_put(0, str());
2246 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2247 dest->obj_at_put(1, str());
2248 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2249 dest->obj_at_put(2, str());
2250 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2251 }
2252 JVM_END
2253
2254 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2255 {
2256 JvmtiVMObjectAllocEventCollector oam;
2257 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2258 bounds_check(cp, index, CHECK_0);
2259 constantTag tag = cp->tag_at(index);
2260 if (!tag.is_field_or_method()) {
2261 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2262 }
2263 return (jint) cp->uncached_klass_ref_index_at(index);
2264 }
2265 JVM_END
2266
2267 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2268 {
2269 JvmtiVMObjectAllocEventCollector oam;
2270 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2271 bounds_check(cp, index, CHECK_0);
2272 constantTag tag = cp->tag_at(index);
2273 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2274 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2275 }
2276 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2277 }
2278 JVM_END
2279
2280 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2281 {
2282 JvmtiVMObjectAllocEventCollector oam;
2283 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2284 bounds_check(cp, index, CHECK_NULL);
2285 constantTag tag = cp->tag_at(index);
2286 if (!tag.is_name_and_type()) {
2287 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2288 }
2289 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2290 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2291 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2292 objArrayHandle dest(THREAD, dest_o);
2293 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2294 dest->obj_at_put(0, str());
2295 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2296 dest->obj_at_put(1, str());
2297 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2298 }
2299 JVM_END
2300
2301 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2302 {
2303 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2304 bounds_check(cp, index, CHECK_0);
2305 constantTag tag = cp->tag_at(index);
2306 if (!tag.is_int()) {
2307 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2308 }
2309 return cp->int_at(index);
2310 }
2311 JVM_END
2312
2313 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2314 {
2315 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2316 bounds_check(cp, index, CHECK_(0L));
2317 constantTag tag = cp->tag_at(index);
2318 if (!tag.is_long()) {
2319 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2320 }
2321 return cp->long_at(index);
2322 }
2323 JVM_END
2324
2325 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2326 {
2327 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2328 bounds_check(cp, index, CHECK_(0.0f));
2329 constantTag tag = cp->tag_at(index);
2330 if (!tag.is_float()) {
2331 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2332 }
2333 return cp->float_at(index);
2334 }
2335 JVM_END
2336
2337 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2338 {
2339 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2340 bounds_check(cp, index, CHECK_(0.0));
2341 constantTag tag = cp->tag_at(index);
2342 if (!tag.is_double()) {
2343 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2344 }
2345 return cp->double_at(index);
2346 }
2347 JVM_END
2348
2349 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2350 {
2351 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2352 bounds_check(cp, index, CHECK_NULL);
2353 constantTag tag = cp->tag_at(index);
2354 if (!tag.is_string()) {
2355 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2356 }
2357 oop str = cp->string_at(index, CHECK_NULL);
2358 return (jstring) JNIHandles::make_local(THREAD, str);
2359 }
2360 JVM_END
2361
2362 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2363 {
2364 JvmtiVMObjectAllocEventCollector oam;
2365 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2366 bounds_check(cp, index, CHECK_NULL);
2367 constantTag tag = cp->tag_at(index);
2368 if (!tag.is_symbol()) {
2369 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2370 }
2371 Symbol* sym = cp->symbol_at(index);
2372 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2373 return (jstring) JNIHandles::make_local(THREAD, str());
2374 }
2375 JVM_END
2376
2377 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2378 {
2379 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2380 bounds_check(cp, index, CHECK_0);
2381 constantTag tag = cp->tag_at(index);
2382 jbyte result = tag.value();
2383 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2384 // they are changed to the corresponding tags from the JVM spec, so that java code in
2385 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2386 if (tag.is_klass_or_reference()) {
2387 result = JVM_CONSTANT_Class;
2388 } else if (tag.is_string_index()) {
2389 result = JVM_CONSTANT_String;
2390 } else if (tag.is_method_type_in_error()) {
2391 result = JVM_CONSTANT_MethodType;
2392 } else if (tag.is_method_handle_in_error()) {
2393 result = JVM_CONSTANT_MethodHandle;
2394 } else if (tag.is_dynamic_constant_in_error()) {
2395 result = JVM_CONSTANT_Dynamic;
2396 }
2397 return result;
2398 }
2399 JVM_END
2400
2401 // Assertion support. //////////////////////////////////////////////////////////
2402
2403 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2404 assert(cls != nullptr, "bad class");
2405
2406 oop r = JNIHandles::resolve(cls);
2407 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2408 if (java_lang_Class::is_primitive(r)) return false;
2409
2410 Klass* k = java_lang_Class::as_Klass(r);
2411 assert(k->is_instance_klass(), "must be an instance klass");
2412 if (!k->is_instance_klass()) return false;
2413
2414 ResourceMark rm(THREAD);
2415 const char* name = k->name()->as_C_string();
2416 bool system_class = k->class_loader() == nullptr;
2417 return JavaAssertions::enabled(name, system_class);
2418
2419 JVM_END
2420
2421
2422 // Return a new AssertionStatusDirectives object with the fields filled in with
2423 // command-line assertion arguments (i.e., -ea, -da).
2424 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2425 JvmtiVMObjectAllocEventCollector oam;
2426 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2427 return JNIHandles::make_local(THREAD, asd);
2428 JVM_END
2429
2430 // Verification ////////////////////////////////////////////////////////////////////////////////
2431
2432 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2433
2434 // RedefineClasses support: bug 6214132 caused verification to fail.
2435 // All functions from this section, unless noted otherwise, should call the functions
2436 // get_klass_considering_redefinition(), or
2437 // get_instance_klass_considering_redefinition()
2438 // These functions return JvmtiThreadState::_scratch_class if the verifier
2439 // was invoked in the middle of the redefinition of cls.
2440 // See jvmtiThreadState.hpp for details.
2441
2442 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2443 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2444 if (k->is_instance_klass()) {
2445 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2446 } else {
2447 return k;
2448 }
2449 }
2450
2451 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2452 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2453 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2454 }
2455
2456 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2457 oop mirror = JNIHandles::resolve_non_null(cls);
2458 if (java_lang_Class::is_primitive(mirror)) {
2459 return JNI_FALSE;
2460 }
2461 Klass* k = java_lang_Class::as_Klass(mirror);
2462 // This isn't necessary since answer is the same because redefinition
2463 // has already checked this matches for the scratch class.
2464 // k = get_klass_considering_redefinition(cls, thread)
2465 jboolean result = k->is_interface();
2466 assert(!result || k->is_instance_klass(),
2467 "all interfaces are instance types");
2468 return result;
2469 JVM_END
2470
2471 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2472 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2473 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2474 return k->name()->as_utf8();
2475 JVM_END
2476
2477
2478 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2479 Klass* k = get_klass_considering_redefinition(cls, thread);
2480 // types will have length zero if this is not an InstanceKlass
2481 // (length is determined by call to JVM_GetClassCPEntriesCount)
2482 if (k->is_instance_klass()) {
2483 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2484 for (int index = cp->length() - 1; index >= 0; index--) {
2485 constantTag tag = cp->tag_at(index);
2486 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2487 }
2488 }
2489 JVM_END
2490
2491
2492 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2493 Klass* k = get_klass_considering_redefinition(cls, thread);
2494 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2495 JVM_END
2496
2497
2498 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2499 Klass* k = get_klass_considering_redefinition(cls, thread);
2500 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2501 JVM_END
2502
2503
2504 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2505 Klass* k = get_klass_considering_redefinition(cls, thread);
2506 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2507 JVM_END
2508
2509
2510 // The following methods, used for the verifier, are never called with
2511 // array klasses, so a direct cast to InstanceKlass is safe.
2512 // Typically, these methods are called in a loop with bounds determined
2513 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2514 // zero for arrays.
2515 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2516 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2517 Method* method = ik->methods()->at(method_index);
2518 int length = method->checked_exceptions_length();
2519 if (length > 0) {
2520 CheckedExceptionElement* table= method->checked_exceptions_start();
2521 for (int i = 0; i < length; i++) {
2522 exceptions[i] = table[i].class_cp_index;
2523 }
2524 }
2525 JVM_END
2526
2527
2528 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2529 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2530 Method* method = ik->methods()->at(method_index);
2531 return method->checked_exceptions_length();
2532 JVM_END
2533
2534
2535 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2536 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2537 Method* method = ik->methods()->at(method_index);
2538 memcpy(code, method->code_base(), method->code_size());
2539 JVM_END
2540
2541
2542 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2543 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2544 Method* method = ik->methods()->at(method_index);
2545 return method->code_size();
2546 JVM_END
2547
2548
2549 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2550 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2551 Method* method = ik->methods()->at(method_index);
2552 ExceptionTable extable(method);
2553 entry->start_pc = extable.start_pc(entry_index);
2554 entry->end_pc = extable.end_pc(entry_index);
2555 entry->handler_pc = extable.handler_pc(entry_index);
2556 entry->catchType = extable.catch_type_index(entry_index);
2557 JVM_END
2558
2559
2560 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2561 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2562 Method* method = ik->methods()->at(method_index);
2563 return method->exception_table_length();
2564 JVM_END
2565
2566
2567 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2568 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2569 Method* method = ik->methods()->at(method_index);
2570 return method->access_flags().as_method_flags();
2571 JVM_END
2572
2573
2574 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2575 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2576 return ik->field_access_flags(field_index);
2577 JVM_END
2578
2579
2580 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2581 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2582 Method* method = ik->methods()->at(method_index);
2583 return method->max_locals();
2584 JVM_END
2585
2586
2587 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2588 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2589 Method* method = ik->methods()->at(method_index);
2590 return method->size_of_parameters();
2591 JVM_END
2592
2593
2594 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2595 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2596 Method* method = ik->methods()->at(method_index);
2597 return method->verifier_max_stack();
2598 JVM_END
2599
2600
2601 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2602 ResourceMark rm(THREAD);
2603 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2604 Method* method = ik->methods()->at(method_index);
2605 return method->is_object_constructor();
2606 JVM_END
2607
2608
2609 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2610 ResourceMark rm(THREAD);
2611 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2612 Method* method = ik->methods()->at(method_index);
2613 return method->is_overpass();
2614 JVM_END
2615
2616 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2617 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2618 Method* method = ik->methods()->at(method_index);
2619 return method->name()->as_utf8();
2620 JVM_END
2621
2622
2623 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2624 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2625 Method* method = ik->methods()->at(method_index);
2626 return method->signature()->as_utf8();
2627 JVM_END
2628
2629 /**
2630 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2631 * read entries in the constant pool. Since the old verifier always
2632 * works on a copy of the code, it will not see any rewriting that
2633 * may possibly occur in the middle of verification. So it is important
2634 * that nothing it calls tries to use the cpCache instead of the raw
2635 * constant pool, so we must use cp->uncached_x methods when appropriate.
2636 */
2637 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2638 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2639 ConstantPool* cp = ik->constants();
2640 switch (cp->tag_at(cp_index).value()) {
2641 case JVM_CONSTANT_Fieldref:
2642 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2643 default:
2644 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2645 }
2646 ShouldNotReachHere();
2647 return nullptr;
2648 JVM_END
2649
2650
2651 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2652 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2653 ConstantPool* cp = ik->constants();
2654 switch (cp->tag_at(cp_index).value()) {
2655 case JVM_CONSTANT_InterfaceMethodref:
2656 case JVM_CONSTANT_Methodref:
2657 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2658 default:
2659 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2660 }
2661 ShouldNotReachHere();
2662 return nullptr;
2663 JVM_END
2664
2665
2666 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2667 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2668 ConstantPool* cp = ik->constants();
2669 switch (cp->tag_at(cp_index).value()) {
2670 case JVM_CONSTANT_InterfaceMethodref:
2671 case JVM_CONSTANT_Methodref:
2672 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2673 default:
2674 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2675 }
2676 ShouldNotReachHere();
2677 return nullptr;
2678 JVM_END
2679
2680
2681 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2682 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2683 ConstantPool* cp = ik->constants();
2684 switch (cp->tag_at(cp_index).value()) {
2685 case JVM_CONSTANT_Fieldref:
2686 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2687 default:
2688 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2689 }
2690 ShouldNotReachHere();
2691 return nullptr;
2692 JVM_END
2693
2694
2695 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2696 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2697 ConstantPool* cp = ik->constants();
2698 Symbol* classname = cp->klass_name_at(cp_index);
2699 return classname->as_utf8();
2700 JVM_END
2701
2702
2703 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2704 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2705 ConstantPool* cp = ik->constants();
2706 switch (cp->tag_at(cp_index).value()) {
2707 case JVM_CONSTANT_Fieldref: {
2708 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2709 Symbol* classname = cp->klass_name_at(class_index);
2710 return classname->as_utf8();
2711 }
2712 default:
2713 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2714 }
2715 ShouldNotReachHere();
2716 return nullptr;
2717 JVM_END
2718
2719
2720 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2721 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2722 ConstantPool* cp = ik->constants();
2723 switch (cp->tag_at(cp_index).value()) {
2724 case JVM_CONSTANT_Methodref:
2725 case JVM_CONSTANT_InterfaceMethodref: {
2726 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2727 Symbol* classname = cp->klass_name_at(class_index);
2728 return classname->as_utf8();
2729 }
2730 default:
2731 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2732 }
2733 ShouldNotReachHere();
2734 return nullptr;
2735 JVM_END
2736
2737
2738 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2739 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2740 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2741 ConstantPool* cp = ik->constants();
2742 ConstantPool* cp_called = ik_called->constants();
2743 switch (cp->tag_at(cp_index).value()) {
2744 case JVM_CONSTANT_Fieldref: {
2745 Symbol* name = cp->uncached_name_ref_at(cp_index);
2746 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2747 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2748 if (fs.name() == name && fs.signature() == signature) {
2749 return fs.access_flags().as_field_flags();
2750 }
2751 }
2752 return -1;
2753 }
2754 default:
2755 fatal("JVM_GetCPFieldModifiers: illegal constant");
2756 }
2757 ShouldNotReachHere();
2758 return 0;
2759 JVM_END
2760
2761
2762 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2763 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2764 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2765 ConstantPool* cp = ik->constants();
2766 switch (cp->tag_at(cp_index).value()) {
2767 case JVM_CONSTANT_Methodref:
2768 case JVM_CONSTANT_InterfaceMethodref: {
2769 Symbol* name = cp->uncached_name_ref_at(cp_index);
2770 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2771 Array<Method*>* methods = ik_called->methods();
2772 int methods_count = methods->length();
2773 for (int i = 0; i < methods_count; i++) {
2774 Method* method = methods->at(i);
2775 if (method->name() == name && method->signature() == signature) {
2776 return method->access_flags().as_method_flags();
2777 }
2778 }
2779 return -1;
2780 }
2781 default:
2782 fatal("JVM_GetCPMethodModifiers: illegal constant");
2783 }
2784 ShouldNotReachHere();
2785 return 0;
2786 JVM_END
2787
2788
2789 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2790
2791 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2792 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2793 JVM_END
2794
2795
2796 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2797 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2798 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2799 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2800 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2801 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2802 JVM_END
2803
2804 // Printing support //////////////////////////////////////////////////
2805 extern "C" {
2806
2807 ATTRIBUTE_PRINTF(3, 0)
2808 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2809 // Reject count values that are negative signed values converted to
2810 // unsigned; see bug 4399518, 4417214
2811 if ((intptr_t)count <= 0) return -1;
2812
2813 int result = os::vsnprintf(str, count, fmt, args);
2814 if (result > 0 && (size_t)result >= count) {
2815 result = -1;
2816 }
2817
2818 return result;
2819 }
2820
2821 ATTRIBUTE_PRINTF(3, 4)
2822 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2823 va_list args;
2824 int len;
2825 va_start(args, fmt);
2826 len = jio_vsnprintf(str, count, fmt, args);
2827 va_end(args);
2828 return len;
2829 }
2830
2831 ATTRIBUTE_PRINTF(2, 3)
2832 int jio_fprintf(FILE* f, const char *fmt, ...) {
2833 int len;
2834 va_list args;
2835 va_start(args, fmt);
2836 len = jio_vfprintf(f, fmt, args);
2837 va_end(args);
2838 return len;
2839 }
2840
2841 ATTRIBUTE_PRINTF(2, 0)
2842 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2843 if (Arguments::vfprintf_hook() != nullptr) {
2844 return Arguments::vfprintf_hook()(f, fmt, args);
2845 } else {
2846 return vfprintf(f, fmt, args);
2847 }
2848 }
2849
2850 ATTRIBUTE_PRINTF(1, 2)
2851 JNIEXPORT int jio_printf(const char *fmt, ...) {
2852 int len;
2853 va_list args;
2854 va_start(args, fmt);
2855 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2856 va_end(args);
2857 return len;
2858 }
2859
2860 // HotSpot specific jio method
2861 void jio_print(const char* s, size_t len) {
2862 // Try to make this function as atomic as possible.
2863 if (Arguments::vfprintf_hook() != nullptr) {
2864 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2865 } else {
2866 // Make an unused local variable to avoid warning from gcc compiler.
2867 bool dummy = os::write(defaultStream::output_fd(), s, len);
2868 }
2869 }
2870
2871 } // Extern C
2872
2873 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2874
2875 // In most of the JVM thread support functions we need to access the
2876 // thread through a ThreadsListHandle to prevent it from exiting and
2877 // being reclaimed while we try to operate on it. The exceptions to this
2878 // rule are when operating on the current thread, or if the monitor of
2879 // the target java.lang.Thread is locked at the Java level - in both
2880 // cases the target cannot exit.
2881
2882 static void thread_entry(JavaThread* thread, TRAPS) {
2883 HandleMark hm(THREAD);
2884 Handle obj(THREAD, thread->threadObj());
2885 JavaValue result(T_VOID);
2886 JavaCalls::call_virtual(&result,
2887 obj,
2888 vmClasses::Thread_klass(),
2889 vmSymbols::run_method_name(),
2890 vmSymbols::void_method_signature(),
2891 THREAD);
2892 }
2893
2894
2895 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2896 #if INCLUDE_CDS
2897 if (CDSConfig::allow_only_single_java_thread()) {
2898 // During java -Xshare:dump, if we allow multiple Java threads to
2899 // execute in parallel, symbols and classes may be loaded in
2900 // random orders which will make the resulting CDS archive
2901 // non-deterministic.
2902 //
2903 // Lucikly, during java -Xshare:dump, it's important to run only
2904 // the code in the main Java thread (which is NOT started here) that
2905 // creates the module graph, etc. It's safe to not start the other
2906 // threads which are launched by class static initializers
2907 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2908 if (log_is_enabled(Info, aot)) {
2909 ResourceMark rm;
2910 oop t = JNIHandles::resolve_non_null(jthread);
2911 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2912 }
2913 return;
2914 }
2915 #endif
2916 JavaThread *native_thread = nullptr;
2917
2918 // We cannot hold the Threads_lock when we throw an exception,
2919 // due to rank ordering issues. Example: we might need to grab the
2920 // Heap_lock while we construct the exception.
2921 bool throw_illegal_thread_state = false;
2922
2923 // We must release the Threads_lock before we can post a jvmti event
2924 // in Thread::start.
2925 {
2926 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2927 // Ensure that the C++ Thread and OSThread structures aren't freed before
2928 // we operate.
2929 MutexLocker ml(Threads_lock);
2930
2931 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2932 // re-starting an already started thread, so we should usually find
2933 // that the JavaThread is null. However for a JNI attached thread
2934 // there is a small window between the Thread object being created
2935 // (with its JavaThread set) and the update to its threadStatus, so we
2936 // have to check for this
2937 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2938 throw_illegal_thread_state = true;
2939 } else {
2940 jlong size =
2941 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2942 // Allocate the C++ Thread structure and create the native thread. The
2943 // stack size retrieved from java is 64-bit signed, but the constructor takes
2944 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2945 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2946 // - Avoid passing negative values which would result in really large stacks.
2947 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2948 size_t sz = size > 0 ? (size_t) size : 0;
2949 native_thread = new JavaThread(&thread_entry, sz);
2950
2951 // At this point it may be possible that no osthread was created for the
2952 // JavaThread due to lack of memory. Check for this situation and throw
2953 // an exception if necessary. Eventually we may want to change this so
2954 // that we only grab the lock if the thread was created successfully -
2955 // then we can also do this check and throw the exception in the
2956 // JavaThread constructor.
2957 if (native_thread->osthread() != nullptr) {
2958 // Note: the current thread is not being used within "prepare".
2959 native_thread->prepare(jthread);
2960 }
2961 }
2962 }
2963
2964 if (throw_illegal_thread_state) {
2965 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2966 }
2967
2968 assert(native_thread != nullptr, "Starting null thread?");
2969
2970 if (native_thread->osthread() == nullptr) {
2971 ResourceMark rm(thread);
2972 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2973 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2974 // No one should hold a reference to the 'native_thread'.
2975 native_thread->smr_delete();
2976 if (JvmtiExport::should_post_resource_exhausted()) {
2977 JvmtiExport::post_resource_exhausted(
2978 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2979 os::native_thread_creation_failed_msg());
2980 }
2981 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2982 os::native_thread_creation_failed_msg());
2983 }
2984
2985 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2986
2987 Thread::start(native_thread);
2988
2989 JVM_END
2990
2991
2992 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2993 ThreadsListHandle tlh(thread);
2994 oop java_thread = nullptr;
2995 JavaThread* receiver = nullptr;
2996 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2997 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2998
2999 if (is_alive) {
3000 // jthread refers to a live JavaThread.
3001 Thread::set_priority(receiver, (ThreadPriority)prio);
3002 }
3003 // Implied else: If the JavaThread hasn't started yet, then the
3004 // priority set in the java.lang.Thread object above will be pushed
3005 // down when it does start.
3006 JVM_END
3007
3008
3009 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3010 HOTSPOT_THREAD_YIELD();
3011 os::naked_yield();
3012 JVM_END
3013
3014 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3015 if (nanos < 0) {
3016 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3017 }
3018
3019 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3020 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3021 }
3022
3023 // Save current thread state and restore it at the end of this block.
3024 // And set new thread state to SLEEPING.
3025 JavaThreadSleepState jtss(thread);
3026
3027 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3028
3029 if (nanos == 0) {
3030 os::naked_yield();
3031 } else {
3032 ThreadState old_state = thread->osthread()->get_state();
3033 thread->osthread()->set_state(SLEEPING);
3034 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3035 // An asynchronous exception could have been thrown on
3036 // us while we were sleeping. We do not overwrite those.
3037 if (!HAS_PENDING_EXCEPTION) {
3038 HOTSPOT_THREAD_SLEEP_END(1);
3039 if (!thread->has_async_exception_condition()) {
3040 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3041 // to properly restore the thread state. That's likely wrong.
3042 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3043 }
3044 }
3045 }
3046 thread->osthread()->set_state(old_state);
3047 }
3048 HOTSPOT_THREAD_SLEEP_END(0);
3049 JVM_END
3050
3051 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3052 oop jthread = thread->threadObj();
3053 assert(jthread != nullptr, "no current carrier thread!");
3054 return JNIHandles::make_local(THREAD, jthread);
3055 JVM_END
3056
3057 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3058 oop theThread = thread->vthread();
3059 assert(theThread != (oop)nullptr, "no current thread!");
3060 return JNIHandles::make_local(THREAD, theThread);
3061 JVM_END
3062
3063 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3064 jobject theThread))
3065 oop threadObj = JNIHandles::resolve(theThread);
3066 thread->set_vthread(threadObj);
3067
3068 // Set _monitor_owner_id of new current Thread
3069 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3070
3071 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3072 JVM_END
3073
3074 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3075 return ThreadIdentifier::unsafe_offset();
3076 JVM_END
3077
3078 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3079 ThreadsListHandle tlh(thread);
3080 JavaThread* receiver = nullptr;
3081 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3082 if (is_alive) {
3083 // jthread refers to a live JavaThread.
3084 receiver->interrupt();
3085 }
3086 JVM_END
3087
3088 // Return true iff the current thread has locked the object passed in
3089
3090 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3091 if (obj == nullptr) {
3092 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3093 }
3094 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3095 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3096 JVM_END
3097
3098 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3099 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3100 return JNIHandles::make_local(THREAD, trace);
3101 JVM_END
3102
3103 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3104 #if INCLUDE_JVMTI
3105 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3106 return JNIHandles::make_local(THREAD, snapshot);
3107 #else
3108 THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
3109 #endif
3110 JVM_END
3111
3112 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3113 // We don't use a ThreadsListHandle here because the current thread
3114 // must be alive.
3115 oop java_thread = JNIHandles::resolve_non_null(jthread);
3116 JavaThread* thr = java_lang_Thread::thread(java_thread);
3117 if (thread == thr && !thr->has_attached_via_jni()) {
3118 // Thread naming is only supported for the current thread and
3119 // we don't set the name of an attached thread to avoid stepping
3120 // on other programs.
3121 ResourceMark rm(thread);
3122 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3123 os::set_native_thread_name(thread_name);
3124 }
3125 JVM_END
3126
3127 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3128 oop theCache = thread->scopedValueCache();
3129 return JNIHandles::make_local(THREAD, theCache);
3130 JVM_END
3131
3132 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3133 jobject theCache))
3134 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3135 thread->set_scopedValueCache(objs);
3136 JVM_END
3137
3138
3139 // java.lang.Package ////////////////////////////////////////////////////////////////
3140
3141
3142 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3143 ResourceMark rm(THREAD);
3144 JvmtiVMObjectAllocEventCollector oam;
3145 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3146 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3147 return (jstring) JNIHandles::make_local(THREAD, result);
3148 JVM_END
3149
3150
3151 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3152 JvmtiVMObjectAllocEventCollector oam;
3153 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3154 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3155 JVM_END
3156
3157
3158 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3159
3160
3161 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3162 MonitorLocker ml(Heap_lock);
3163 oop ref = Universe::reference_pending_list();
3164 if (ref != nullptr) {
3165 Universe::clear_reference_pending_list();
3166 }
3167 return JNIHandles::make_local(THREAD, ref);
3168 JVM_END
3169
3170 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3171 MonitorLocker ml(Heap_lock);
3172 return Universe::has_reference_pending_list();
3173 JVM_END
3174
3175 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3176 MonitorLocker ml(Heap_lock);
3177 while (!Universe::has_reference_pending_list()) {
3178 ml.wait();
3179 }
3180 JVM_END
3181
3182 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3183 oop ref_oop = JNIHandles::resolve_non_null(ref);
3184 // PhantomReference has its own implementation of get().
3185 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3186 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3187 return JNIHandles::make_local(THREAD, referent);
3188 JVM_END
3189
3190 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3191 oop ref_oop = JNIHandles::resolve_non_null(ref);
3192 // PhantomReference has its own implementation of refersTo().
3193 // See: JVM_PhantomReferenceRefersTo
3194 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3195 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3196 return referent == JNIHandles::resolve(o);
3197 JVM_END
3198
3199 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3200 oop ref_oop = JNIHandles::resolve_non_null(ref);
3201 // FinalReference has it's own implementation of clear().
3202 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3203 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3204 // If the referent has already been cleared then done.
3205 // However, if the referent is dead but has not yet been cleared by
3206 // concurrent reference processing, it should NOT be cleared here.
3207 // Instead, clearing should be left to the GC. Clearing it here could
3208 // detectably lose an expected notification, which is impossible with
3209 // STW reference processing. The clearing in enqueue() doesn't have
3210 // this problem, since the enqueue covers the notification, but it's not
3211 // worth the effort to handle that case specially.
3212 return;
3213 }
3214 java_lang_ref_Reference::clear_referent(ref_oop);
3215 JVM_END
3216
3217
3218 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3219
3220
3221 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3222 oop ref_oop = JNIHandles::resolve_non_null(ref);
3223 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3224 return referent == JNIHandles::resolve(o);
3225 JVM_END
3226
3227
3228 // ObjectInputStream ///////////////////////////////////////////////////////////////
3229
3230 // Return the first user-defined class loader up the execution stack, or null
3231 // if only code from the bootstrap or platform class loader is on the stack.
3232
3233 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3234 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3235 InstanceKlass* ik = vfst.method()->method_holder();
3236 oop loader = ik->class_loader();
3237 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3238 return JNIHandles::make_local(THREAD, loader);
3239 }
3240 }
3241 return nullptr;
3242 JVM_END
3243
3244
3245 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3246
3247
3248 // resolve array handle and check arguments
3249 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3250 if (arr == nullptr) {
3251 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3252 }
3253 oop a = JNIHandles::resolve_non_null(arr);
3254 if (!a->is_array()) {
3255 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3256 } else if (type_array_only && !a->is_typeArray()) {
3257 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3258 }
3259 return arrayOop(a);
3260 }
3261
3262
3263 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3264 arrayOop a = check_array(env, arr, false, CHECK_0);
3265 return a->length();
3266 JVM_END
3267
3268
3269 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3270 JvmtiVMObjectAllocEventCollector oam;
3271 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3272 jvalue value;
3273 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3274 oop box = Reflection::box(&value, type, CHECK_NULL);
3275 return JNIHandles::make_local(THREAD, box);
3276 JVM_END
3277
3278
3279 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3280 jvalue value;
3281 value.i = 0; // to initialize value before getting used in CHECK
3282 arrayOop a = check_array(env, arr, true, CHECK_(value));
3283 assert(a->is_typeArray(), "just checking");
3284 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3285 BasicType wide_type = (BasicType) wCode;
3286 if (type != wide_type) {
3287 Reflection::widen(&value, type, wide_type, CHECK_(value));
3288 }
3289 return value;
3290 JVM_END
3291
3292
3293 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3294 arrayOop a = check_array(env, arr, false, CHECK);
3295 oop box = JNIHandles::resolve(val);
3296 jvalue value;
3297 value.i = 0; // to initialize value before getting used in CHECK
3298 BasicType value_type;
3299 if (a->is_objArray()) {
3300 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3301 value_type = Reflection::unbox_for_regular_object(box, &value);
3302 } else {
3303 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3304 }
3305 Reflection::array_set(&value, a, index, value_type, CHECK);
3306 JVM_END
3307
3308
3309 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3310 arrayOop a = check_array(env, arr, true, CHECK);
3311 assert(a->is_typeArray(), "just checking");
3312 BasicType value_type = (BasicType) vCode;
3313 Reflection::array_set(&v, a, index, value_type, CHECK);
3314 JVM_END
3315
3316
3317 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3318 JvmtiVMObjectAllocEventCollector oam;
3319 oop element_mirror = JNIHandles::resolve(eltClass);
3320 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3321 return JNIHandles::make_local(THREAD, result);
3322 JVM_END
3323
3324
3325 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3326 JvmtiVMObjectAllocEventCollector oam;
3327 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3328 oop element_mirror = JNIHandles::resolve(eltClass);
3329 assert(dim_array->is_typeArray(), "just checking");
3330 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3331 return JNIHandles::make_local(THREAD, result);
3332 JVM_END
3333
3334
3335 // Library support ///////////////////////////////////////////////////////////////////////////
3336
3337 JVM_LEAF(void*, JVM_LoadZipLibrary())
3338 return ZipLibrary::handle();
3339 JVM_END
3340
3341 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3342 //%note jvm_ct
3343 char ebuf[1024];
3344 void *load_result;
3345 {
3346 ThreadToNativeFromVM ttnfvm(thread);
3347 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3348 }
3349 if (load_result == nullptr) {
3350 if (throwException) {
3351 char msg[1024];
3352 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3353 // Since 'ebuf' may contain a string encoded using
3354 // platform encoding scheme, we need to pass
3355 // Exceptions::unsafe_to_utf8 to the new_exception method
3356 // as the last argument. See bug 6367357.
3357 Handle h_exception =
3358 Exceptions::new_exception(thread,
3359 vmSymbols::java_lang_UnsatisfiedLinkError(),
3360 msg, Exceptions::unsafe_to_utf8);
3361
3362 THROW_HANDLE_NULL(h_exception);
3363 } else {
3364 log_info(library)("Failed to load library %s", name);
3365 return load_result;
3366 }
3367 }
3368 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3369 return load_result;
3370 JVM_END
3371
3372
3373 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3374 os::dll_unload(handle);
3375 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3376 JVM_END
3377
3378
3379 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3380 void* find_result = os::dll_lookup(handle, name);
3381 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3382 find_result != nullptr ? "Found" : "Failed to find",
3383 name, p2i(handle));
3384 return find_result;
3385 JVM_END
3386
3387
3388 // JNI version ///////////////////////////////////////////////////////////////////////////////
3389
3390 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3391 return Threads::is_supported_jni_version_including_1_1(version);
3392 JVM_END
3393
3394
3395 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3396 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3397 JVM_END
3398
3399 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3400 return Arguments::is_valhalla_enabled() ? JNI_TRUE : JNI_FALSE;
3401 JVM_END
3402
3403 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3404 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3405 JVM_END
3406
3407 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3408 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3409 JVM_END
3410
3411 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3412 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3413 JVM_END
3414
3415 // String support ///////////////////////////////////////////////////////////////////////////
3416
3417 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3418 JvmtiVMObjectAllocEventCollector oam;
3419 if (str == nullptr) return nullptr;
3420 oop string = JNIHandles::resolve_non_null(str);
3421 oop result = StringTable::intern(string, CHECK_NULL);
3422 return (jstring) JNIHandles::make_local(THREAD, result);
3423 JVM_END
3424
3425
3426 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3427
3428 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3429 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3430 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3431 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3432 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3433 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3434
3435
3436 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3437 VM_Exit::block_if_vm_exited();
3438 return new PlatformMutex();
3439 }
3440
3441
3442 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3443 VM_Exit::block_if_vm_exited();
3444 delete ((PlatformMutex*) mon);
3445 }
3446
3447
3448 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3449 VM_Exit::block_if_vm_exited();
3450 ((PlatformMutex*) mon)->lock();
3451 return 0;
3452 }
3453
3454
3455 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3456 VM_Exit::block_if_vm_exited();
3457 ((PlatformMutex*) mon)->unlock();
3458 }
3459
3460
3461 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3462
3463 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3464 Handle loader, jboolean throwError, TRAPS) {
3465 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3466
3467 // Check if we should initialize the class
3468 if (init && klass->is_instance_klass()) {
3469 klass->initialize(CHECK_NULL);
3470 }
3471 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3472 }
3473
3474
3475 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3476
3477 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3478 Handle method_handle;
3479 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3480 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3481 Handle receiver(THREAD, JNIHandles::resolve(obj));
3482 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3483 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3484
3485 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3486 jobject res = JNIHandles::make_local(THREAD, result);
3487 if (JvmtiExport::should_post_vm_object_alloc()) {
3488 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3489 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3490 if (java_lang_Class::is_primitive(ret_type)) {
3491 // Only for primitive type vm allocates memory for java object.
3492 // See box() method.
3493 JvmtiExport::post_vm_object_alloc(thread, result);
3494 }
3495 }
3496 return res;
3497 } else {
3498 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3499 }
3500 JVM_END
3501
3502
3503 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3504 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3505 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3506 oop constructor_mirror = JNIHandles::resolve(c);
3507 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3508 jobject res = JNIHandles::make_local(THREAD, result);
3509 if (JvmtiExport::should_post_vm_object_alloc()) {
3510 JvmtiExport::post_vm_object_alloc(thread, result);
3511 }
3512 return res;
3513 JVM_END
3514
3515 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3516 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3517 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3518 JVM_END
3519
3520 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3521 jclass caller,
3522 jstring interfaceMethodName,
3523 jobject factoryType,
3524 jobject interfaceMethodType,
3525 jobject implementationMember,
3526 jobject dynamicMethodType,
3527 jclass lambdaProxyClass))
3528 #if INCLUDE_CDS
3529 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3530 return;
3531 }
3532
3533 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3534 if (caller_ik->is_hidden()) {
3535 // Hidden classes not of type lambda proxy classes are currently not being archived.
3536 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3537 // registered for archiving.
3538 return;
3539 }
3540 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3541 assert(lambda_ik->is_hidden(), "must be a hidden class");
3542 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3543
3544 Symbol* interface_method_name = nullptr;
3545 if (interfaceMethodName != nullptr) {
3546 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3547 }
3548 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3549 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3550
3551 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3552 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3553
3554 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3555 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3556 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3557
3558 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3559 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3560
3561 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3562 interface_method_type, m, dynamic_method_type, THREAD);
3563 #endif // INCLUDE_CDS
3564 JVM_END
3565
3566 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3567 jclass caller,
3568 jstring interfaceMethodName,
3569 jobject factoryType,
3570 jobject interfaceMethodType,
3571 jobject implementationMember,
3572 jobject dynamicMethodType))
3573 #if INCLUDE_CDS
3574
3575 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3576 implementationMember == nullptr || dynamicMethodType == nullptr) {
3577 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3578 }
3579
3580 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3581 if (!caller_ik->in_aot_cache()) {
3582 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3583 return nullptr;
3584 }
3585
3586 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3587 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3588 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3589
3590 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3591 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3592
3593 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3594 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3595 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3596
3597 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3598 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3599
3600 InstanceKlass* loaded_lambda =
3601 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3602 interface_method_type, m, dynamic_method_type,
3603 CHECK_(nullptr));
3604 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3605 #else
3606 return nullptr;
3607 #endif // INCLUDE_CDS
3608 JVM_END
3609
3610 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3611 if (CDSConfig::is_dumping_static_archive()) {
3612 // We do this so that the default CDS archive can be deterministic.
3613 const char* release = VM_Version::vm_release();
3614 const char* dbg_level = VM_Version::jdk_debug_level();
3615 const char* version = VM_Version::internal_vm_info_string();
3616 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3617 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3618 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3619 seed += (jlong)VM_Version::vm_major_version();
3620 seed += (jlong)VM_Version::vm_minor_version();
3621 seed += (jlong)VM_Version::vm_security_version();
3622 seed += (jlong)VM_Version::vm_patch_version();
3623 if (seed == 0) { // don't let this ever be zero.
3624 seed = 0x87654321;
3625 }
3626 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3627 return seed;
3628 } else {
3629 return 0;
3630 }
3631 JVM_END
3632
3633 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3634 return CDSConfig::get_status();
3635 JVM_END
3636
3637 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3638 #if INCLUDE_CDS
3639 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3640 if (line != nullptr) {
3641 ResourceMark rm(THREAD);
3642 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3643 char* c_line = java_lang_String::as_utf8_string(h_line());
3644 if (CDSConfig::is_dumping_dynamic_archive()) {
3645 // Note: LambdaFormInvokers::append take same format which is not
3646 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3647 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3648 }
3649 if (ClassListWriter::is_enabled()) {
3650 ClassListWriter w;
3651 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3652 }
3653 }
3654 #endif // INCLUDE_CDS
3655 JVM_END
3656
3657 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3658 #if INCLUDE_CDS
3659 ResourceMark rm(THREAD);
3660 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3661 char* file_name = java_lang_String::as_utf8_string(file_handle());
3662 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3663 #endif // INCLUDE_CDS
3664 JVM_END
3665
3666 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3667 #if INCLUDE_CDS
3668 ResourceMark rm(THREAD);
3669 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3670 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3671 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3672 #endif // INCLUDE_CDS
3673 JVM_END
3674
3675 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3676 #if INCLUDE_CDS
3677 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3678 if (!k->is_instance_klass()) {
3679 return false;
3680 } else {
3681 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3682 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3683 // This class will be cached in AOT-initialized state. No need for init barriers.
3684 return false;
3685 } else {
3686 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3687 // must emit barriers to ensure class initialization during production run.
3688 ResourceMark rm(THREAD);
3689 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3690 return true;
3691 }
3692 }
3693 #else
3694 return false;
3695 #endif // INCLUDE_CDS
3696 JVM_END
3697
3698 // Returns an array of all live Thread objects (VM internal JavaThreads,
3699 // jvmti agent threads, and JNI attaching threads are skipped)
3700 // See CR 6404306 regarding JNI attaching threads
3701 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3702 ResourceMark rm(THREAD);
3703 ThreadsListEnumerator tle(THREAD, false, false);
3704 JvmtiVMObjectAllocEventCollector oam;
3705
3706 int num_threads = tle.num_threads();
3707 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3708 objArrayHandle threads_ah(THREAD, r);
3709
3710 for (int i = 0; i < num_threads; i++) {
3711 Handle h = tle.get_threadObj(i);
3712 threads_ah->obj_at_put(i, h());
3713 }
3714
3715 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3716 JVM_END
3717
3718
3719 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3720 // Return StackTraceElement[][], each element is the stack trace of a thread in
3721 // the corresponding entry in the given threads array
3722 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3723 JvmtiVMObjectAllocEventCollector oam;
3724
3725 // Check if threads is null
3726 if (threads == nullptr) {
3727 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3728 }
3729
3730 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3731 objArrayHandle ah(THREAD, a);
3732 int num_threads = ah->length();
3733 // check if threads is non-empty array
3734 if (num_threads == 0) {
3735 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3736 }
3737
3738 // check if threads is not an array of objects of Thread class
3739 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3740 if (k != vmClasses::Thread_klass()) {
3741 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3742 }
3743 refArrayHandle rah(THREAD, (refArrayOop)ah()); // j.l.Thread is an identity class, arrays are always reference arrays
3744
3745 ResourceMark rm(THREAD);
3746
3747 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3748 for (int i = 0; i < num_threads; i++) {
3749 oop thread_obj = rah->obj_at(i);
3750 instanceHandle h(THREAD, (instanceOop) thread_obj);
3751 thread_handle_array->append(h);
3752 }
3753
3754 // The JavaThread references in thread_handle_array are validated
3755 // in VM_ThreadDump::doit().
3756 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3757 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3758
3759 JVM_END
3760
3761 // JVM monitoring and management support
3762 JVM_LEAF(void*, JVM_GetManagement(jint version))
3763 return Management::get_jmm_interface(version);
3764 JVM_END
3765
3766 // com.sun.tools.attach.VirtualMachine agent properties support
3767 //
3768 // Initialize the agent properties with the properties maintained in the VM
3769 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3770 ResourceMark rm;
3771
3772 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3773
3774 PUTPROP(props, "sun.java.command", Arguments::java_command());
3775 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3776 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3777 return properties;
3778 JVM_END
3779
3780 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3781 {
3782 JvmtiVMObjectAllocEventCollector oam;
3783
3784 if (ofClass == nullptr) {
3785 return nullptr;
3786 }
3787 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3788 // Special handling for primitive objects
3789 if (java_lang_Class::is_primitive(mirror())) {
3790 return nullptr;
3791 }
3792 Klass* k = java_lang_Class::as_Klass(mirror());
3793 if (!k->is_instance_klass()) {
3794 return nullptr;
3795 }
3796 InstanceKlass* ik = InstanceKlass::cast(k);
3797 int encl_method_class_idx = ik->enclosing_method_class_index();
3798 if (encl_method_class_idx == 0) {
3799 return nullptr;
3800 }
3801 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3802 objArrayHandle dest(THREAD, dest_o);
3803 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3804 dest->obj_at_put(0, enc_k->java_mirror());
3805 int encl_method_method_idx = ik->enclosing_method_method_index();
3806 if (encl_method_method_idx != 0) {
3807 Symbol* sym = ik->constants()->symbol_at(
3808 extract_low_short_from_int(
3809 ik->constants()->name_and_type_at(encl_method_method_idx)));
3810 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3811 dest->obj_at_put(1, str());
3812 sym = ik->constants()->symbol_at(
3813 extract_high_short_from_int(
3814 ik->constants()->name_and_type_at(encl_method_method_idx)));
3815 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3816 dest->obj_at_put(2, str());
3817 }
3818 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3819 }
3820 JVM_END
3821
3822 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3823 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3824 ResourceMark rm(THREAD);
3825
3826 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3827 return nullptr;
3828 }
3829
3830 char** vm_flags = Arguments::jvm_flags_array();
3831 char** vm_args = Arguments::jvm_args_array();
3832 int num_flags = Arguments::num_jvm_flags();
3833 int num_args = Arguments::num_jvm_args();
3834
3835 InstanceKlass* ik = vmClasses::String_klass();
3836 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3837 objArrayHandle result_h(THREAD, r);
3838
3839 int index = 0;
3840 for (int j = 0; j < num_flags; j++, index++) {
3841 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3842 result_h->obj_at_put(index, h());
3843 }
3844 for (int i = 0; i < num_args; i++, index++) {
3845 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3846 result_h->obj_at_put(index, h());
3847 }
3848 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3849 JVM_END
3850
3851 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3852 return os::get_signal_number(name);
3853 JVM_END
3854
3855 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread))
3856 oop vt = JNIHandles::resolve_external_guard(vthread);
3857 MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/);
3858 JVM_END
3859
3860 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread))
3861 oop vt = JNIHandles::resolve_external_guard(vthread);
3862 MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/);
3863 JVM_END
3864
3865 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3866 oop vt = JNIHandles::resolve_external_guard(vthread);
3867 MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/);
3868 JVM_END
3869
3870 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3871 oop vt = JNIHandles::resolve_external_guard(vthread);
3872 MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/);
3873 JVM_END
3874
3875 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3876 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3877 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3878 #if INCLUDE_JVMTI
3879 if (!DoJVMTIVirtualThreadTransitions) {
3880 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3881 return;
3882 }
3883 assert(thread->is_disable_suspend() != (bool)enter,
3884 "nested or unbalanced monitor enter/exit is not allowed");
3885 thread->toggle_is_disable_suspend();
3886 #endif
3887 JVM_END
3888
3889 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3890 #if INCLUDE_JFR
3891 freeze_result result = THREAD->last_freeze_fail_result();
3892 assert(result != freeze_ok, "sanity check");
3893 EventVirtualThreadPinned event(UNTIMED);
3894 event.set_starttime(THREAD->last_freeze_fail_time());
3895 if (event.should_commit()) {
3896 ResourceMark rm(THREAD);
3897 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3898 THREAD->post_vthread_pinned_event(&event, str, result);
3899 }
3900 #endif
3901 JVM_END
3902
3903 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3904 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3905 assert(parkEvent != nullptr, "not initialized");
3906
3907 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3908 oop vthread_head = nullptr;
3909 while (true) {
3910 if (list_head.peek() != nullptr) {
3911 for (;;) {
3912 oop head = list_head.resolve();
3913 if (list_head.cmpxchg(head, nullptr) == head) {
3914 return JNIHandles::make_local(THREAD, head);
3915 }
3916 }
3917 }
3918 ThreadBlockInVM tbivm(THREAD);
3919 parkEvent->park();
3920 }
3921 JVM_END
3922
3923 /*
3924 * Return the current class's class file version. The low order 16 bits of the
3925 * returned jint contain the class's major version. The high order 16 bits
3926 * contain the class's minor version.
3927 */
3928 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3929 oop mirror = JNIHandles::resolve_non_null(current);
3930 if (java_lang_Class::is_primitive(mirror)) {
3931 // return latest major version and minor version of 0.
3932 return JVM_CLASSFILE_MAJOR_VERSION;
3933 }
3934 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3935 return (ik->minor_version() << 16) | ik->major_version();
3936 JVM_END
3937
3938 /*
3939 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3940 * get the value will see a materialized value and not a scalar-replaced
3941 * null value.
3942 */
3943 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3944 JVM_EnsureMaterializedForStackWalk(env, value);
3945 JVM_END
3946
3947 /*
3948 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3949 */
3950 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3951 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3952 JVM_END