1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassInitializer.hpp"
26 #include "cds/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/os.inline.hpp"
90 #include "runtime/osThread.hpp"
91 #include "runtime/perfData.hpp"
92 #include "runtime/reflection.hpp"
93 #include "runtime/synchronizer.hpp"
94 #include "runtime/threadIdentifier.hpp"
95 #include "runtime/threadSMR.hpp"
96 #include "runtime/vframe.inline.hpp"
97 #include "runtime/vm_version.hpp"
98 #include "runtime/vmOperations.hpp"
99 #include "services/attachListener.hpp"
100 #include "services/management.hpp"
101 #include "services/threadService.hpp"
102 #include "utilities/checkedCast.hpp"
103 #include "utilities/copy.hpp"
104 #include "utilities/defaultStream.hpp"
105 #include "utilities/dtrace.hpp"
106 #include "utilities/events.hpp"
107 #include "utilities/macros.hpp"
108 #include "utilities/utf8.hpp"
109 #include "utilities/zipLibrary.hpp"
110 #if INCLUDE_CDS
111 #include "classfile/systemDictionaryShared.hpp"
112 #endif
113 #if INCLUDE_JFR
114 #include "jfr/jfr.hpp"
115 #endif
116 #if INCLUDE_MANAGEMENT
117 #include "services/finalizerService.hpp"
118 #endif
119 #ifdef LINUX
120 #include "osContainer_linux.hpp"
121 #endif
122
123 #include <errno.h>
124
125 /*
126 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
127 such ctors and calls MUST NOT come between an oop declaration/init and its
128 usage because if objects are move this may cause various memory stomps, bus
129 errors and segfaults. Here is a cookbook for causing so called "naked oop
130 failures":
131
132 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
133 // Object address to be held directly in mirror & not visible to GC
134 oop mirror = JNIHandles::resolve_non_null(ofClass);
135
136 // If this ctor can hit a safepoint, moving objects around, then
137 ComplexConstructor foo;
138
139 // Boom! mirror may point to JUNK instead of the intended object
140 (some dereference of mirror)
141
142 // Here's another call that may block for GC, making mirror stale
143 MutexLocker ml(some_lock);
144
145 // And here's an initializer that can result in a stale oop
146 // all in one step.
147 oop o = call_that_can_throw_exception(TRAPS);
148
149
150 The solution is to keep the oop declaration BELOW the ctor or function
151 call that might cause a GC, do another resolve to reassign the oop, or
152 consider use of a Handle instead of an oop so there is immunity from object
153 motion. But note that the "QUICK" entries below do not have a handlemark
154 and thus can only support use of handles passed in.
155 */
156
157 extern void trace_class_resolution(Klass* to_class) {
158 ResourceMark rm;
159 int line_number = -1;
160 const char * source_file = nullptr;
161 const char * trace = "explicit";
162 InstanceKlass* caller = nullptr;
163 JavaThread* jthread = JavaThread::current();
164 if (jthread->has_last_Java_frame()) {
165 vframeStream vfst(jthread);
166
167 // Scan up the stack skipping ClassLoader frames.
168 Method* last_caller = nullptr;
169
170 while (!vfst.at_end()) {
171 Method* m = vfst.method();
172 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
173 break;
174 }
175 last_caller = m;
176 vfst.next();
177 }
178 // if this is called from Class.forName0 and that is called from Class.forName,
179 // then print the caller of Class.forName. If this is Class.loadClass, then print
180 // that caller, otherwise keep quiet since this should be picked up elsewhere.
181 bool found_it = false;
182 if (!vfst.at_end() &&
183 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
184 vfst.method()->name() == vmSymbols::forName0_name()) {
185 vfst.next();
186 if (!vfst.at_end() &&
187 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
188 vfst.method()->name() == vmSymbols::forName_name()) {
189 vfst.next();
190 found_it = true;
191 }
192 } else if (last_caller != nullptr &&
193 last_caller->method_holder()->name() ==
194 vmSymbols::java_lang_ClassLoader() &&
195 last_caller->name() == vmSymbols::loadClass_name()) {
196 found_it = true;
197 } else if (!vfst.at_end()) {
198 if (vfst.method()->is_native()) {
199 // JNI call
200 found_it = true;
201 }
202 }
203 if (found_it && !vfst.at_end()) {
204 // found the caller
205 caller = vfst.method()->method_holder();
206 line_number = vfst.method()->line_number_from_bci(vfst.bci());
207 if (line_number == -1) {
208 // show method name if it's a native method
209 trace = vfst.method()->name_and_sig_as_C_string();
210 }
211 Symbol* s = caller->source_file_name();
212 if (s != nullptr) {
213 source_file = s->as_C_string();
214 }
215 }
216 }
217 if (caller != nullptr) {
218 if (to_class != caller) {
219 const char * from = caller->external_name();
220 const char * to = to_class->external_name();
221 // print in a single call to reduce interleaving between threads
222 if (source_file != nullptr) {
223 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
224 } else {
225 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
226 }
227 }
228 }
229 }
230
231 // java.lang.System //////////////////////////////////////////////////////////////////////
232
233
234 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
235 return os::javaTimeMillis();
236 JVM_END
237
238 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
239 return os::javaTimeNanos();
240 JVM_END
241
242 // The function below is actually exposed by jdk.internal.misc.VM and not
243 // java.lang.System, but we choose to keep it here so that it stays next
244 // to JVM_CurrentTimeMillis and JVM_NanoTime
245
246 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
247 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
248
249 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
250 jlong seconds;
251 jlong nanos;
252
253 os::javaTimeSystemUTC(seconds, nanos);
254
255 // We're going to verify that the result can fit in a long.
256 // For that we need the difference in seconds between 'seconds'
257 // and 'offset_secs' to be such that:
258 // |seconds - offset_secs| < (2^63/10^9)
259 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
260 // which makes |seconds - offset_secs| < 2^33
261 // and we will prefer +/- 2^32 as the maximum acceptable diff
262 // as 2^32 has a more natural feel than 2^33...
263 //
264 // So if |seconds - offset_secs| >= 2^32 - we return a special
265 // sentinel value (-1) which the caller should take as an
266 // exception value indicating that the offset given to us is
267 // too far from range of the current time - leading to too big
268 // a nano adjustment. The caller is expected to recover by
269 // computing a more accurate offset and calling this method
270 // again. (For the record 2^32 secs is ~136 years, so that
271 // should rarely happen)
272 //
273 jlong diff = seconds - offset_secs;
274 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
275 return -1; // sentinel value: the offset is too far off the target
276 }
277
278 // return the adjustment. If you compute a time by adding
279 // this number of nanoseconds along with the number of seconds
280 // in the offset you should get the current UTC time.
281 return (diff * (jlong)1000000000) + nanos;
282 JVM_END
283
284 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
285 jobject dst, jint dst_pos, jint length))
286 // Check if we have null pointers
287 if (src == nullptr || dst == nullptr) {
288 THROW(vmSymbols::java_lang_NullPointerException());
289 }
290 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
291 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
292 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
293 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
294 // Do copy
295 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
296 JVM_END
297
298
299 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
300 JavaValue r(T_OBJECT);
301 // public synchronized Object put(Object key, Object value);
302 HandleMark hm(THREAD);
303 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
304 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
305 JavaCalls::call_virtual(&r,
306 props,
307 vmClasses::Properties_klass(),
308 vmSymbols::put_name(),
309 vmSymbols::object_object_object_signature(),
310 key_str,
311 value_str,
312 THREAD);
313 }
314
315
316 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
317
318 /*
319 * Return all of the system properties in a Java String array with alternating
320 * names and values from the jvm SystemProperty.
321 * Which includes some internal and all commandline -D defined properties.
322 */
323 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
324 ResourceMark rm(THREAD);
325 HandleMark hm(THREAD);
326 int ndx = 0;
327 int fixedCount = 2;
328
329 SystemProperty* p = Arguments::system_properties();
330 int count = Arguments::PropertyList_count(p);
331
332 // Allocate result String array
333 InstanceKlass* ik = vmClasses::String_klass();
334 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
335 objArrayHandle result_h(THREAD, r);
336
337 while (p != nullptr) {
338 const char * key = p->key();
339 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
340 const char * value = p->value();
341 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
342 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
343 result_h->obj_at_put(ndx * 2, key_str());
344 result_h->obj_at_put(ndx * 2 + 1, value_str());
345 ndx++;
346 }
347 p = p->next();
348 }
349
350 // Convert the -XX:MaxDirectMemorySize= command line flag
351 // to the sun.nio.MaxDirectMemorySize property.
352 // Do this after setting user properties to prevent people
353 // from setting the value with a -D option, as requested.
354 // Leave empty if not supplied
355 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
356 char as_chars[256];
357 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
358 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
359 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
360 result_h->obj_at_put(ndx * 2, key_str());
361 result_h->obj_at_put(ndx * 2 + 1, value_str());
362 ndx++;
363 }
364
365 // JVM monitoring and management support
366 // Add the sun.management.compiler property for the compiler's name
367 {
368 #undef CSIZE
369 #if defined(_LP64)
370 #define CSIZE "64-Bit "
371 #else
372 #define CSIZE
373 #endif // 64bit
374
375 #if COMPILER1_AND_COMPILER2
376 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
377 #else
378 #if defined(COMPILER1)
379 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
380 #elif defined(COMPILER2)
381 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
382 #elif INCLUDE_JVMCI
383 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
384 #else
385 const char* compiler_name = "";
386 #endif // compilers
387 #endif // COMPILER1_AND_COMPILER2
388
389 if (*compiler_name != '\0' &&
390 (Arguments::mode() != Arguments::_int)) {
391 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
392 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
393 result_h->obj_at_put(ndx * 2, key_str());
394 result_h->obj_at_put(ndx * 2 + 1, value_str());
395 ndx++;
396 }
397 }
398
399 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
400 JVM_END
401
402
403 /*
404 * Return the temporary directory that the VM uses for the attach
405 * and perf data files.
406 *
407 * It is important that this directory is well-known and the
408 * same for all VM instances. It cannot be affected by configuration
409 * variables such as java.io.tmpdir.
410 */
411 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
412 HandleMark hm(THREAD);
413 const char* temp_dir = os::get_temp_directory();
414 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
415 return (jstring) JNIHandles::make_local(THREAD, h());
416 JVM_END
417
418 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
419 if (len < 0) {
420 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
421 }
422 elmClass->initialize(CHECK);
423 if (elmClass->is_array_klass() || elmClass->is_identity_class()) {
424 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
425 }
426 if (elmClass->is_abstract()) {
427 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
428 }
429 }
430
431 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
432 oop o = JNIHandles::resolve_non_null(orig);
433 assert(o->is_array(), "Must be");
434 oop array = nullptr;
435 arrayOop org = (arrayOop)o;
436 arrayHandle oh(THREAD, org);
437 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass());
438 InlineKlass* vk = InlineKlass::cast(ak->element_klass());
439 int len = to - from; // length of the new array
440 if (ak->is_null_free_array_klass()) {
441 if ((len != 0) && (from >= org->length() || to > org->length())) {
442 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
443 }
444 }
445 if (org->is_flatArray()) {
446 FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass());
447 LayoutKind lk = fak->layout_kind();
448 ArrayKlass::ArrayProperties props = ArrayKlass::ArrayProperties::DEFAULT;
449 switch(lk) {
450 case LayoutKind::ATOMIC_FLAT:
451 props = ArrayKlass::ArrayProperties::NULL_RESTRICTED;
452 break;
453 case LayoutKind::NON_ATOMIC_FLAT:
454 props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED | ArrayKlass::ArrayProperties::NON_ATOMIC);
455 break;
456 case LayoutKind::NULLABLE_ATOMIC_FLAT:
457 props = ArrayKlass::ArrayProperties::NON_ATOMIC;
458 break;
459 default:
460 ShouldNotReachHere();
461 }
462 array = oopFactory::new_flatArray(vk, len, props, lk, CHECK_NULL);
463 arrayHandle ah(THREAD, (arrayOop)array);
464 int end = to < oh()->length() ? to : oh()->length();
465 for (int i = from; i < end; i++) {
466 void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper());
467 void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper());
468 vk->copy_payload_to_addr(src, dst, lk, false);
469 }
470 array = ah();
471 } else {
472 ArrayKlass::ArrayProperties props = org->is_null_free_array() ? ArrayKlass::ArrayProperties::NULL_RESTRICTED : ArrayKlass::ArrayProperties::DEFAULT;
473 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL);
474 int end = to < oh()->length() ? to : oh()->length();
475 for (int i = from; i < end; i++) {
476 if (i < ((objArrayOop)oh())->length()) {
477 ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i));
478 } else {
479 assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
480 ((objArrayOop)array)->obj_at_put(i - from, nullptr);
481 }
482 }
483 }
484 return (jarray) JNIHandles::make_local(THREAD, array);
485 JVM_END
486
487 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
488 oop mirror = JNIHandles::resolve_non_null(elmClass);
489 oop init = JNIHandles::resolve(initVal);
490 if (init == nullptr) {
491 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
492 }
493 Handle init_h(THREAD, init);
494 Klass* klass = java_lang_Class::as_Klass(mirror);
495 if (klass != init_h()->klass()) {
496 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
497 }
498 validate_array_arguments(klass, len, CHECK_NULL);
499 InlineKlass* vk = InlineKlass::cast(klass);
500 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NON_ATOMIC | ArrayKlass::ArrayProperties::NULL_RESTRICTED);
501 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
502 for (int i = 0; i < len; i++) {
503 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
504 }
505 return (jarray) JNIHandles::make_local(THREAD, array);
506 JVM_END
507
508 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
509 oop mirror = JNIHandles::resolve_non_null(elmClass);
510 oop init = JNIHandles::resolve(initVal);
511 if (init == nullptr) {
512 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
513 }
514 Handle init_h(THREAD, init);
515 Klass* klass = java_lang_Class::as_Klass(mirror);
516 if (klass != init_h()->klass()) {
517 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
518 }
519 validate_array_arguments(klass, len, CHECK_NULL);
520 InlineKlass* vk = InlineKlass::cast(klass);
521 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED);
522 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
523 for (int i = 0; i < len; i++) {
524 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
525 }
526 return (jarray) JNIHandles::make_local(THREAD, array);
527 JVM_END
528
529 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
530 oop mirror = JNIHandles::resolve_non_null(elmClass);
531 Klass* klass = java_lang_Class::as_Klass(mirror);
532 klass->initialize(CHECK_NULL);
533 validate_array_arguments(klass, len, CHECK_NULL);
534 InlineKlass* vk = InlineKlass::cast(klass);
535 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::DEFAULT);
536 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
537 return (jarray) JNIHandles::make_local(THREAD, array);
538 JVM_END
539
540 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
541 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
542 return oop->is_flatArray();
543 JVM_END
544
545 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
546 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
547 return oop->is_null_free_array();
548 JVM_END
549
550 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
551 // There are multiple cases where an array can/must support atomic access:
552 // - the array is a reference array
553 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or ATOMIC_FLAT
554 // - the array is flat and its component type is naturally atomic
555 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
556 if (oop->is_refArray()) return true;
557 if (oop->is_flatArray()) {
558 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
559 if (fak->layout_kind() == LayoutKind::ATOMIC_FLAT || fak->layout_kind() == LayoutKind::NULLABLE_ATOMIC_FLAT) {
560 return true;
561 }
562 if (fak->element_klass()->is_naturally_atomic()) return true;
563 }
564 return false;
565 JVM_END
566
567 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
568
569 extern volatile jint vm_created;
570
571 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
572 EventShutdown event;
573 if (event.should_commit()) {
574 event.set_reason("Shutdown requested from Java");
575 event.commit();
576 }
577 JVM_END
578
579
580 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
581 before_exit(thread, true);
582 vm_exit(code);
583 JVM_END
584
585
586 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
587 if (!DisableExplicitGC) {
588 EventSystemGC event;
589 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
590 Universe::heap()->collect(GCCause::_java_lang_system_gc);
591 event.commit();
592 }
593 JVM_END
594
595
596 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
597 return Universe::heap()->millis_since_last_whole_heap_examined();
598 JVM_END
599
600
601 static inline jlong convert_size_t_to_jlong(size_t val) {
602 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
603 NOT_LP64 (return (jlong)val;)
604 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
605 }
606
607 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
608 size_t n = Universe::heap()->capacity();
609 return convert_size_t_to_jlong(n);
610 JVM_END
611
612
613 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
614 size_t n = Universe::heap()->unused();
615 return convert_size_t_to_jlong(n);
616 JVM_END
617
618
619 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
620 size_t n = Universe::heap()->max_capacity();
621 return convert_size_t_to_jlong(n);
622 JVM_END
623
624
625 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
626 return os::active_processor_count();
627 JVM_END
628
629 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
630 #ifdef LINUX
631 if (UseContainerSupport) {
632 return JNI_TRUE;
633 }
634 #endif
635 return JNI_FALSE;
636 JVM_END
637
638 JVM_LEAF(jboolean, JVM_IsContainerized(void))
639 #ifdef LINUX
640 if (OSContainer::is_containerized()) {
641 return JNI_TRUE;
642 }
643 #endif
644 return JNI_FALSE;
645 JVM_END
646
647 // java.lang.Throwable //////////////////////////////////////////////////////
648
649 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
650 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
651 java_lang_Throwable::fill_in_stack_trace(exception);
652 JVM_END
653
654 // java.lang.NullPointerException ///////////////////////////////////////////
655
656 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
657 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
658
659 oop exc = JNIHandles::resolve_non_null(throwable);
660
661 Method* method;
662 int bci;
663 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
664 return nullptr;
665 }
666 if (method->is_native()) {
667 return nullptr;
668 }
669
670 stringStream ss;
671 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
672 if (ok) {
673 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
674 return (jstring) JNIHandles::make_local(THREAD, result);
675 } else {
676 return nullptr;
677 }
678 JVM_END
679
680 // java.lang.StackTraceElement //////////////////////////////////////////////
681
682
683 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
684 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
685 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
686 objArrayHandle stack_trace(THREAD, st);
687 // Fill in the allocated stack trace
688 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
689 JVM_END
690
691
692 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
693 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
694 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
695 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
696 JVM_END
697
698
699 // java.lang.StackWalker //////////////////////////////////////////////////////
700 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
701 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
702
703 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
704 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
705 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
706 if (!have_name) {
707 oop name = StringTable::intern(method->name(), CHECK);
708 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
709 }
710 if (!have_type) {
711 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
712 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
713 }
714 JVM_END
715
716 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
717 jint skip_frames, jobject contScope, jobject cont,
718 jint buffer_size, jint start_index, jobjectArray frames))
719 if (!thread->has_last_Java_frame()) {
720 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
721 }
722
723 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
724 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
725 Handle cont_h(THREAD, JNIHandles::resolve(cont));
726 // frames array is a ClassFrameInfo[] array when only getting caller reference,
727 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
728 // be null.
729 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
730 objArrayHandle frames_array_h(THREAD, fa);
731
732 if (frames_array_h->length() < buffer_size) {
733 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
734 }
735
736 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
737 buffer_size, start_index, frames_array_h, CHECK_NULL);
738 return JNIHandles::make_local(THREAD, result);
739 JVM_END
740
741
742 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
743 jint last_batch_count, jint buffer_size, jint start_index,
744 jobjectArray frames))
745 // frames array is a ClassFrameInfo[] array when only getting caller reference,
746 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
747 // be null.
748 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
749 objArrayHandle frames_array_h(THREAD, fa);
750
751 if (frames_array_h->length() < buffer_size) {
752 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
753 }
754
755 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
756 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
757 start_index, frames_array_h, THREAD);
758 JVM_END
759
760 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
761 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
762 objArrayHandle frames_array_h(THREAD, fa);
763 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
764 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
765
766 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
767 JVM_END
768
769 // java.lang.Object ///////////////////////////////////////////////
770
771
772 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
773 // as implemented in the classic virtual machine; return 0 if object is null
774 if (handle == nullptr) {
775 return 0;
776 }
777 oop obj = JNIHandles::resolve_non_null(handle);
778 if (EnableValhalla && obj->klass()->is_inline_klass()) {
779 JavaValue result(T_INT);
780 JavaCallArguments args;
781 Handle ho(THREAD, obj);
782 args.push_oop(ho);
783 methodHandle method(THREAD, Universe::value_object_hash_code_method());
784 JavaCalls::call(&result, method, &args, THREAD);
785 if (HAS_PENDING_EXCEPTION) {
786 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
787 Handle e(THREAD, PENDING_EXCEPTION);
788 CLEAR_PENDING_EXCEPTION;
789 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
790 }
791 }
792 return result.get_jint();
793 } else {
794 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
795 }
796 JVM_END
797
798
799 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
800 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
801 ObjectSynchronizer::wait(obj, ms, CHECK);
802 JVM_END
803
804
805 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
806 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
807 ObjectSynchronizer::notify(obj, CHECK);
808 JVM_END
809
810
811 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
812 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
813 ObjectSynchronizer::notifyall(obj, CHECK);
814 JVM_END
815
816
817 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
818 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
819 Klass* klass = obj->klass();
820 JvmtiVMObjectAllocEventCollector oam;
821
822 #ifdef ASSERT
823 // Just checking that the cloneable flag is set correct
824 if (obj->is_array()) {
825 guarantee(klass->is_cloneable(), "all arrays are cloneable");
826 } else {
827 guarantee(obj->is_instance(), "should be instanceOop");
828 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
829 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
830 }
831 #endif
832
833 // Check if class of obj supports the Cloneable interface.
834 // All arrays are considered to be cloneable (See JLS 20.1.5).
835 // All j.l.r.Reference classes are considered non-cloneable.
836 if (!klass->is_cloneable() ||
837 (klass->is_instance_klass() &&
838 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
839 ResourceMark rm(THREAD);
840 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
841 }
842
843 if (klass->is_inline_klass()) {
844 // Value instances have no identity, so return the current instance instead of allocating a new one
845 // Value classes cannot have finalizers, so the method can return immediately
846 return JNIHandles::make_local(THREAD, obj());
847 }
848
849 // Make shallow object copy
850 const size_t size = obj->size();
851 oop new_obj_oop = nullptr;
852 if (obj->is_array()) {
853 const int length = ((arrayOop)obj())->length();
854 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
855 /* do_zero */ true, CHECK_NULL);
856 } else {
857 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
858 }
859
860 HeapAccess<>::clone(obj(), new_obj_oop, size);
861
862 Handle new_obj(THREAD, new_obj_oop);
863 // Caution: this involves a java upcall, so the clone should be
864 // "gc-robust" by this stage.
865 if (klass->has_finalizer()) {
866 assert(obj->is_instance(), "should be instanceOop");
867 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
868 new_obj = Handle(THREAD, new_obj_oop);
869 }
870
871 return JNIHandles::make_local(THREAD, new_obj());
872 JVM_END
873
874 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
875
876 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
877 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
878 JVM_END
879
880 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
881 return InstanceKlass::is_finalization_enabled();
882 JVM_END
883
884 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
885
886 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
887 CONT_RegisterNativeMethods(env, cls);
888 JVM_END
889
890 // java.io.File ///////////////////////////////////////////////////////////////
891
892 JVM_LEAF(char*, JVM_NativePath(char* path))
893 return os::native_path(path);
894 JVM_END
895
896
897 // Misc. class handling ///////////////////////////////////////////////////////////
898
899
900 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
901 // Getting the class of the caller frame.
902 //
903 // The call stack at this point looks something like this:
904 //
905 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
906 // [1] [ @CallerSensitive API.method ]
907 // [.] [ (skipped intermediate frames) ]
908 // [n] [ caller ]
909 vframeStream vfst(thread);
910 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
911 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
912 Method* m = vfst.method();
913 assert(m != nullptr, "sanity");
914 switch (n) {
915 case 0:
916 // This must only be called from Reflection.getCallerClass
917 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
918 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
919 }
920 // fall-through
921 case 1:
922 // Frame 0 and 1 must be caller sensitive.
923 if (!m->caller_sensitive()) {
924 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
925 }
926 break;
927 default:
928 if (!m->is_ignored_by_security_stack_walk()) {
929 // We have reached the desired frame; return the holder class.
930 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
931 }
932 break;
933 }
934 }
935 return nullptr;
936 JVM_END
937
938
939 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
940 oop mirror = nullptr;
941 BasicType t = name2type(utf);
942 if (t != T_ILLEGAL && !is_reference_type(t)) {
943 mirror = Universe::java_mirror(t);
944 }
945 if (mirror == nullptr) {
946 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
947 } else {
948 return (jclass) JNIHandles::make_local(THREAD, mirror);
949 }
950 JVM_END
951
952
953 // Returns a class loaded by the bootstrap class loader; or null
954 // if not found. ClassNotFoundException is not thrown.
955 // FindClassFromBootLoader is exported to the launcher for windows.
956 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
957 const char* name))
958 // Java libraries should ensure that name is never null or illegal.
959 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
960 // It's impossible to create this class; the name cannot fit
961 // into the constant pool.
962 return nullptr;
963 }
964 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
965
966 TempNewSymbol h_name = SymbolTable::new_symbol(name);
967 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
968 if (k == nullptr) {
969 return nullptr;
970 }
971
972 if (log_is_enabled(Debug, class, resolve)) {
973 trace_class_resolution(k);
974 }
975 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
976 JVM_END
977
978 // Find a class with this name in this loader, using the caller's protection domain.
979 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
980 jboolean init, jobject loader,
981 jclass caller))
982 TempNewSymbol h_name =
983 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
984 CHECK_NULL);
985
986 oop loader_oop = JNIHandles::resolve(loader);
987 oop from_class = JNIHandles::resolve(caller);
988 Handle h_loader(THREAD, loader_oop);
989
990 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
991 false, THREAD);
992
993 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
994 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
995 }
996 return result;
997 JVM_END
998
999 // Currently only called from the old verifier.
1000 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1001 jboolean init, jclass from))
1002 TempNewSymbol h_name =
1003 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1004 CHECK_NULL);
1005 oop from_class_oop = JNIHandles::resolve(from);
1006 Klass* from_class = (from_class_oop == nullptr)
1007 ? (Klass*)nullptr
1008 : java_lang_Class::as_Klass(from_class_oop);
1009 oop class_loader = nullptr;
1010 if (from_class != nullptr) {
1011 class_loader = from_class->class_loader();
1012 }
1013 Handle h_loader(THREAD, class_loader);
1014 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1015
1016 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1017 // this function is generally only used for class loading during verification.
1018 ResourceMark rm;
1019 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1020 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1021 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1022 }
1023
1024 #if INCLUDE_CDS
1025 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1026 InstanceKlass* ik = InstanceKlass::cast(from_class);
1027 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1028 }
1029 #endif
1030
1031 return result;
1032 JVM_END
1033
1034 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1035 static jclass jvm_define_class_common(const char *name,
1036 jobject loader, const jbyte *buf,
1037 jsize len, jobject pd, const char *source,
1038 TRAPS) {
1039 if (source == nullptr) source = "__JVM_DefineClass__";
1040
1041 JavaThread* jt = THREAD;
1042
1043 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1044 ClassLoader::perf_define_appclass_selftime(),
1045 ClassLoader::perf_define_appclasses(),
1046 jt->get_thread_stat()->perf_recursion_counts_addr(),
1047 jt->get_thread_stat()->perf_timers_addr(),
1048 PerfClassTraceTime::DEFINE_CLASS);
1049
1050 if (UsePerfData) {
1051 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1052 }
1053
1054 // Class resolution will get the class name from the .class stream if the name is null.
1055 TempNewSymbol class_name = name == nullptr ? nullptr :
1056 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1057 CHECK_NULL);
1058
1059 ResourceMark rm(THREAD);
1060 ClassFileStream st((u1*)buf, len, source);
1061 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1062 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1063 ClassLoadInfo cl_info(protection_domain);
1064 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1065 class_loader,
1066 cl_info,
1067 CHECK_NULL);
1068
1069 if (log_is_enabled(Debug, class, resolve)) {
1070 trace_class_resolution(k);
1071 }
1072
1073 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1074 }
1075
1076 enum {
1077 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1078 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1079 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1080 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1081 };
1082
1083 /*
1084 * Define a class with the specified flags that indicates if it's a nestmate,
1085 * hidden, or strongly referenced from class loader.
1086 */
1087 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1088 const jbyte *buf, jsize len, jobject pd,
1089 jboolean init, int flags, jobject classData, TRAPS) {
1090 ResourceMark rm(THREAD);
1091
1092 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1093 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1094 if (lookup_k == nullptr) {
1095 // The error message is wrong. We come here only if lookup is a primitive class
1096 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1097 }
1098
1099 Handle class_loader (THREAD, lookup_k->class_loader());
1100
1101 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1102 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1103 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1104 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1105
1106 InstanceKlass* host_class = nullptr;
1107 if (is_nestmate) {
1108 host_class = lookup_k->nest_host(CHECK_NULL);
1109 }
1110
1111 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1112 name,
1113 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1114 is_nestmate ? host_class->external_name() : "",
1115 is_hidden ? "hidden" : "not hidden",
1116 is_strong ? "strong" : "weak",
1117 vm_annotations ? "with vm annotations" : "without vm annotation");
1118
1119 if (!is_hidden) {
1120 // classData is only applicable for hidden classes
1121 if (classData != nullptr) {
1122 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1123 }
1124 if (is_nestmate) {
1125 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1126 }
1127 if (!is_strong) {
1128 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1129 }
1130 if (vm_annotations) {
1131 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1132 }
1133 if (flags != STRONG_LOADER_LINK) {
1134 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1135 err_msg("invalid flag 0x%x", flags));
1136 }
1137 }
1138
1139 // Class resolution will get the class name from the .class stream if the name is null.
1140 TempNewSymbol class_name = name == nullptr ? nullptr :
1141 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1142 CHECK_NULL);
1143
1144 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1145 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1146 ClassFileStream st((u1*)buf, len, source);
1147
1148 InstanceKlass* ik = nullptr;
1149 if (!is_hidden) {
1150 ClassLoadInfo cl_info(protection_domain);
1151 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1152 class_loader,
1153 cl_info,
1154 CHECK_NULL);
1155
1156 if (log_is_enabled(Debug, class, resolve)) {
1157 trace_class_resolution(ik);
1158 }
1159 } else { // hidden
1160 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1161 ClassLoadInfo cl_info(protection_domain,
1162 host_class,
1163 classData_h,
1164 is_hidden,
1165 is_strong,
1166 vm_annotations);
1167 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1168 class_loader,
1169 cl_info,
1170 CHECK_NULL);
1171
1172 // The hidden class loader data has been artificially been kept alive to
1173 // this point. The mirror and any instances of this class have to keep
1174 // it alive afterwards.
1175 ik->class_loader_data()->dec_keep_alive_ref_count();
1176
1177 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1178 ModuleEntry* module = ik->module();
1179 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1180 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1181 module_name,
1182 ik->external_name(),
1183 host_class->external_name(),
1184 ik->is_hidden() ? "is hidden" : "is not hidden");
1185 }
1186 }
1187
1188 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1189 // non-hidden class or nestmate class must be in the same package as the Lookup class
1190 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1191 }
1192
1193 if (init) {
1194 ik->initialize(CHECK_NULL);
1195 } else {
1196 ik->link_class(CHECK_NULL);
1197 }
1198
1199 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1200 }
1201
1202 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1203 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1204 JVM_END
1205
1206 /*
1207 * Define a class with the specified lookup class.
1208 * lookup: Lookup class
1209 * name: the name of the class
1210 * buf: class bytes
1211 * len: length of class bytes
1212 * pd: protection domain
1213 * init: initialize the class
1214 * flags: properties of the class
1215 * classData: private static pre-initialized field
1216 */
1217 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1218 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1219
1220 if (lookup == nullptr) {
1221 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1222 }
1223
1224 assert(buf != nullptr, "buf must not be null");
1225
1226 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1227 JVM_END
1228
1229 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1230
1231 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1232 JVM_END
1233
1234 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1235 ResourceMark rm(THREAD);
1236
1237 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1238 char* str = java_lang_String::as_utf8_string(h_name());
1239
1240 // Sanity check, don't expect null
1241 if (str == nullptr) return nullptr;
1242
1243 // Internalize the string, converting '.' to '/' in string.
1244 char* p = (char*)str;
1245 while (*p != '\0') {
1246 if (*p == '.') {
1247 *p = '/';
1248 }
1249 p++;
1250 }
1251
1252 const int str_len = (int)(p - str);
1253 if (str_len > Symbol::max_length()) {
1254 // It's impossible to create this class; the name cannot fit
1255 // into the constant pool.
1256 return nullptr;
1257 }
1258 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1259
1260 // Security Note:
1261 // The Java level wrapper will perform the necessary security check allowing
1262 // us to pass the null as the initiating class loader.
1263 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1264 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1265 #if INCLUDE_CDS
1266 if (k == nullptr) {
1267 // If the class is not already loaded, try to see if it's in the shared
1268 // archive for the current classloader (h_loader).
1269 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1270 }
1271 #endif
1272 return (k == nullptr) ? nullptr :
1273 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1274 JVM_END
1275
1276 // Module support //////////////////////////////////////////////////////////////////////////////
1277
1278 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1279 jstring location, jobjectArray packages))
1280 Handle h_module (THREAD, JNIHandles::resolve(module));
1281 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1282 JVM_END
1283
1284 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1285 Handle h_module (THREAD, JNIHandles::resolve(module));
1286 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1287 JVM_END
1288
1289 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1290 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1291 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1292 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1293 JVM_END
1294
1295 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1296 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1297 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1298 JVM_END
1299
1300 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1301 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1302 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1303 JVM_END
1304
1305 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1306 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1307 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1308 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1309 JVM_END
1310
1311 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1312 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1313 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1314 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1315 JVM_END
1316
1317 // Reflection support //////////////////////////////////////////////////////////////////////////////
1318
1319 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1320 assert (cls != nullptr, "illegal class");
1321 JvmtiVMObjectAllocEventCollector oam;
1322 ResourceMark rm(THREAD);
1323 HandleMark hm(THREAD);
1324 Handle java_class(THREAD, JNIHandles::resolve(cls));
1325 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1326 return (jstring) JNIHandles::make_local(THREAD, result);
1327 JVM_END
1328
1329
1330 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1331 JvmtiVMObjectAllocEventCollector oam;
1332 oop mirror = JNIHandles::resolve_non_null(cls);
1333
1334 // Special handling for primitive objects
1335 if (java_lang_Class::is_primitive(mirror)) {
1336 // Primitive objects does not have any interfaces
1337 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1338 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1339 }
1340
1341 Klass* klass = java_lang_Class::as_Klass(mirror);
1342 // Figure size of result array
1343 int size;
1344 if (klass->is_instance_klass()) {
1345 InstanceKlass* ik = InstanceKlass::cast(klass);
1346 size = ik->local_interfaces()->length();
1347 } else {
1348 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1349 size = 2;
1350 }
1351
1352 // Allocate result array
1353 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1354 objArrayHandle result (THREAD, r);
1355 // Fill in result
1356 if (klass->is_instance_klass()) {
1357 // Regular instance klass, fill in all local interfaces
1358 for (int index = 0; index < size; index++) {
1359 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1360 result->obj_at_put(index, k->java_mirror());
1361 }
1362 } else {
1363 // All arrays implement java.lang.Cloneable and java.io.Serializable
1364 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1365 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1366 }
1367 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1368 JVM_END
1369
1370
1371 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1372 oop mirror = JNIHandles::resolve_non_null(cls);
1373 if (java_lang_Class::is_primitive(mirror)) {
1374 return JNI_FALSE;
1375 }
1376 Klass* k = java_lang_Class::as_Klass(mirror);
1377 return k->is_hidden();
1378 JVM_END
1379
1380 class ScopedValueBindingsResolver {
1381 public:
1382 InstanceKlass* Carrier_klass;
1383 ScopedValueBindingsResolver(JavaThread* THREAD) {
1384 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1385 Carrier_klass = InstanceKlass::cast(k);
1386 }
1387 };
1388
1389 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1390 ResourceMark rm(THREAD);
1391 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1392 JvmtiVMObjectAllocEventCollector oam;
1393
1394 static ScopedValueBindingsResolver resolver(THREAD);
1395
1396 // Iterate through Java frames
1397 vframeStream vfst(thread);
1398 for(; !vfst.at_end(); vfst.next()) {
1399 int loc = -1;
1400 // get method of frame
1401 Method* method = vfst.method();
1402
1403 Symbol *name = method->name();
1404
1405 InstanceKlass* holder = method->method_holder();
1406 if (name == vmSymbols::runWith_method_name()) {
1407 if (holder == vmClasses::Thread_klass()
1408 || holder == resolver.Carrier_klass) {
1409 loc = 1;
1410 }
1411 }
1412
1413 if (loc != -1) {
1414 javaVFrame *frame = vfst.asJavaVFrame();
1415 StackValueCollection* locals = frame->locals();
1416 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1417 Handle result = head_sv->get_obj();
1418 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1419 if (result() != nullptr) {
1420 return JNIHandles::make_local(THREAD, result());
1421 }
1422 }
1423 }
1424
1425 return nullptr;
1426 JVM_END
1427
1428 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1429 JvmtiVMObjectAllocEventCollector oam;
1430 // ofClass is a reference to a java_lang_Class object. The mirror object
1431 // of an InstanceKlass
1432 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1433 if (java_lang_Class::is_primitive(ofMirror) ||
1434 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1435 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1436 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1437 }
1438
1439 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1440 InnerClassesIterator iter(k);
1441
1442 if (iter.length() == 0) {
1443 // Neither an inner nor outer class
1444 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1445 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1446 }
1447
1448 // find inner class info
1449 constantPoolHandle cp(thread, k->constants());
1450 int length = iter.length();
1451
1452 // Allocate temp. result array
1453 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1454 objArrayHandle result (THREAD, r);
1455 int members = 0;
1456
1457 for (; !iter.done(); iter.next()) {
1458 int ioff = iter.inner_class_info_index();
1459 int ooff = iter.outer_class_info_index();
1460
1461 if (ioff != 0 && ooff != 0) {
1462 // Check to see if the name matches the class we're looking for
1463 // before attempting to find the class.
1464 if (cp->klass_name_at_matches(k, ooff)) {
1465 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1466 if (outer_klass == k) {
1467 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1468 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1469
1470 // Throws an exception if outer klass has not declared k as
1471 // an inner klass
1472 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1473
1474 result->obj_at_put(members, inner_klass->java_mirror());
1475 members++;
1476 }
1477 }
1478 }
1479 }
1480
1481 if (members != length) {
1482 // Return array of right length
1483 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1484 for(int i = 0; i < members; i++) {
1485 res->obj_at_put(i, result->obj_at(i));
1486 }
1487 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1488 }
1489
1490 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1491 JVM_END
1492
1493
1494 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1495 {
1496 // ofClass is a reference to a java_lang_Class object.
1497 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1498 if (java_lang_Class::is_primitive(ofMirror)) {
1499 return nullptr;
1500 }
1501 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1502 if (!klass->is_instance_klass()) {
1503 return nullptr;
1504 }
1505
1506 bool inner_is_member = false;
1507 Klass* outer_klass
1508 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1509 if (outer_klass == nullptr) return nullptr; // already a top-level class
1510 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1511 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1512 }
1513 JVM_END
1514
1515 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1516 {
1517 oop mirror = JNIHandles::resolve_non_null(cls);
1518 if (java_lang_Class::is_primitive(mirror)) {
1519 return nullptr;
1520 }
1521 Klass* klass = java_lang_Class::as_Klass(mirror);
1522 if (!klass->is_instance_klass()) {
1523 return nullptr;
1524 }
1525 InstanceKlass* k = InstanceKlass::cast(klass);
1526 int ooff = 0, noff = 0;
1527 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1528 if (noff != 0) {
1529 constantPoolHandle i_cp(thread, k->constants());
1530 Symbol* name = i_cp->symbol_at(noff);
1531 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1532 return (jstring) JNIHandles::make_local(THREAD, str());
1533 }
1534 }
1535 return nullptr;
1536 }
1537 JVM_END
1538
1539 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1540 assert (cls != nullptr, "illegal class");
1541 JvmtiVMObjectAllocEventCollector oam;
1542 ResourceMark rm(THREAD);
1543 oop mirror = JNIHandles::resolve_non_null(cls);
1544 // Return null for arrays and primitives
1545 if (!java_lang_Class::is_primitive(mirror)) {
1546 Klass* k = java_lang_Class::as_Klass(mirror);
1547 if (k->is_instance_klass()) {
1548 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1549 if (sym == nullptr) return nullptr;
1550 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1551 return (jstring) JNIHandles::make_local(THREAD, str());
1552 }
1553 }
1554 return nullptr;
1555 JVM_END
1556
1557
1558 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1559 assert (cls != nullptr, "illegal class");
1560 oop mirror = JNIHandles::resolve_non_null(cls);
1561 // Return null for arrays and primitives
1562 if (!java_lang_Class::is_primitive(mirror)) {
1563 Klass* k = java_lang_Class::as_Klass(mirror);
1564 if (k->is_instance_klass()) {
1565 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1566 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1567 }
1568 }
1569 return nullptr;
1570 JVM_END
1571
1572
1573 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1574 // some of this code was adapted from from jni_FromReflectedField
1575
1576 oop reflected = JNIHandles::resolve_non_null(field);
1577 oop mirror = java_lang_reflect_Field::clazz(reflected);
1578 int slot = java_lang_reflect_Field::slot(reflected);
1579 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1580
1581 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1582 int offset = ik->field_offset(slot);
1583
1584 if (modifiers & JVM_ACC_STATIC) {
1585 // for static fields we only look in the current class
1586 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1587 assert(false, "cannot find static field");
1588 return false;
1589 }
1590 } else {
1591 // for instance fields we start with the current class and work
1592 // our way up through the superclass chain
1593 if (!ik->find_field_from_offset(offset, false, &fd)) {
1594 assert(false, "cannot find instance field");
1595 return false;
1596 }
1597 }
1598 return true;
1599 }
1600
1601 static Method* jvm_get_method_common(jobject method) {
1602 // some of this code was adapted from from jni_FromReflectedMethod
1603
1604 oop reflected = JNIHandles::resolve_non_null(method);
1605 oop mirror = nullptr;
1606 int slot = 0;
1607
1608 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1609 mirror = java_lang_reflect_Constructor::clazz(reflected);
1610 slot = java_lang_reflect_Constructor::slot(reflected);
1611 } else {
1612 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1613 "wrong type");
1614 mirror = java_lang_reflect_Method::clazz(reflected);
1615 slot = java_lang_reflect_Method::slot(reflected);
1616 }
1617 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1618
1619 Method* m = ik->method_with_idnum(slot);
1620 assert(m != nullptr, "cannot find method");
1621 return m; // caller has to deal with null in product mode
1622 }
1623
1624 /* Type use annotations support (JDK 1.8) */
1625
1626 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1627 assert (cls != nullptr, "illegal class");
1628 ResourceMark rm(THREAD);
1629 // Return null for arrays and primitives
1630 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1631 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1632 if (k->is_instance_klass()) {
1633 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1634 if (type_annotations != nullptr) {
1635 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1636 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1637 }
1638 }
1639 }
1640 return nullptr;
1641 JVM_END
1642
1643 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1644 assert (method != nullptr, "illegal method");
1645 // method is a handle to a java.lang.reflect.Method object
1646 Method* m = jvm_get_method_common(method);
1647 if (m == nullptr) {
1648 return nullptr;
1649 }
1650
1651 AnnotationArray* type_annotations = m->type_annotations();
1652 if (type_annotations != nullptr) {
1653 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1654 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1655 }
1656
1657 return nullptr;
1658 JVM_END
1659
1660 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1661 assert (field != nullptr, "illegal field");
1662 fieldDescriptor fd;
1663 bool gotFd = jvm_get_field_common(field, fd);
1664 if (!gotFd) {
1665 return nullptr;
1666 }
1667
1668 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1669 JVM_END
1670
1671 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1672 if (!cp->is_within_bounds(index)) {
1673 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1674 }
1675 }
1676
1677 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1678 {
1679 // method is a handle to a java.lang.reflect.Method object
1680 Method* method_ptr = jvm_get_method_common(method);
1681 methodHandle mh (THREAD, method_ptr);
1682 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1683 const int num_params = mh->method_parameters_length();
1684
1685 if (num_params < 0) {
1686 // A -1 return value from method_parameters_length means there is no
1687 // parameter data. Return null to indicate this to the reflection
1688 // API.
1689 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1690 return (jobjectArray)nullptr;
1691 } else {
1692 // Otherwise, we return something up to reflection, even if it is
1693 // a zero-length array. Why? Because in some cases this can
1694 // trigger a MalformedParametersException.
1695
1696 // make sure all the symbols are properly formatted
1697 for (int i = 0; i < num_params; i++) {
1698 MethodParametersElement* params = mh->method_parameters_start();
1699 int index = params[i].name_cp_index;
1700 constantPoolHandle cp(THREAD, mh->constants());
1701 bounds_check(cp, index, CHECK_NULL);
1702
1703 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1704 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1705 "Wrong type at constant pool index");
1706 }
1707
1708 }
1709
1710 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1711 objArrayHandle result (THREAD, result_oop);
1712
1713 for (int i = 0; i < num_params; i++) {
1714 MethodParametersElement* params = mh->method_parameters_start();
1715 // For a 0 index, give a null symbol
1716 Symbol* sym = 0 != params[i].name_cp_index ?
1717 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1718 int flags = params[i].flags;
1719 oop param = Reflection::new_parameter(reflected_method, i, sym,
1720 flags, CHECK_NULL);
1721 result->obj_at_put(i, param);
1722 }
1723 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1724 }
1725 }
1726 JVM_END
1727
1728 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1729
1730 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1731 {
1732 JvmtiVMObjectAllocEventCollector oam;
1733
1734 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1735 // Exclude primitive types and array types
1736 if (java_lang_Class::is_primitive(ofMirror) ||
1737 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1738 // Return empty array
1739 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1740 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1741 }
1742
1743 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1744 constantPoolHandle cp(THREAD, k->constants());
1745
1746 // Ensure class is linked
1747 k->link_class(CHECK_NULL);
1748
1749 // Allocate result
1750 int num_fields;
1751
1752 if (publicOnly) {
1753 num_fields = 0;
1754 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1755 if (fs.access_flags().is_public()) ++num_fields;
1756 }
1757 } else {
1758 num_fields = k->java_fields_count();
1759 }
1760
1761 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1762 objArrayHandle result (THREAD, r);
1763
1764 int out_idx = 0;
1765 fieldDescriptor fd;
1766 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1767 if (!publicOnly || fs.access_flags().is_public()) {
1768 fd.reinitialize(k, fs.to_FieldInfo());
1769 oop field = Reflection::new_field(&fd, CHECK_NULL);
1770 result->obj_at_put(out_idx, field);
1771 ++out_idx;
1772 }
1773 }
1774 assert(out_idx == num_fields, "just checking");
1775 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1776 }
1777 JVM_END
1778
1779 // A class is a record if and only if it is final and a direct subclass of
1780 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1781 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1782 {
1783 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1784 if (k != nullptr && k->is_instance_klass()) {
1785 InstanceKlass* ik = InstanceKlass::cast(k);
1786 return ik->is_record();
1787 } else {
1788 return false;
1789 }
1790 }
1791 JVM_END
1792
1793 // Returns an array containing the components of the Record attribute,
1794 // or null if the attribute is not present.
1795 //
1796 // Note that this function returns the components of the Record attribute
1797 // even if the class is not a record.
1798 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1799 {
1800 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1801
1802 Array<RecordComponent*>* components = ik->record_components();
1803 if (components != nullptr) {
1804 JvmtiVMObjectAllocEventCollector oam;
1805 constantPoolHandle cp(THREAD, ik->constants());
1806 int length = components->length();
1807 assert(length >= 0, "unexpected record_components length");
1808 objArrayOop record_components =
1809 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1810 objArrayHandle components_h (THREAD, record_components);
1811
1812 for (int x = 0; x < length; x++) {
1813 RecordComponent* component = components->at(x);
1814 assert(component != nullptr, "unexpected null record component");
1815 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1816 components_h->obj_at_put(x, component_oop);
1817 }
1818 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1819 }
1820
1821 return nullptr;
1822 }
1823 JVM_END
1824
1825 static jobjectArray get_class_declared_methods_helper(
1826 JNIEnv *env,
1827 jclass ofClass, jboolean publicOnly,
1828 bool want_constructor,
1829 Klass* klass, TRAPS) {
1830
1831 JvmtiVMObjectAllocEventCollector oam;
1832
1833 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1834 // Exclude primitive types and array types
1835 if (java_lang_Class::is_primitive(ofMirror)
1836 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1837 // Return empty array
1838 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1839 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1840 }
1841
1842 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1843
1844 // Ensure class is linked
1845 k->link_class(CHECK_NULL);
1846
1847 Array<Method*>* methods = k->methods();
1848 int methods_length = methods->length();
1849
1850 // Save original method_idnum in case of redefinition, which can change
1851 // the idnum of obsolete methods. The new method will have the same idnum
1852 // but if we refresh the methods array, the counts will be wrong.
1853 ResourceMark rm(THREAD);
1854 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1855 int num_methods = 0;
1856
1857 // Select methods matching the criteria.
1858 for (int i = 0; i < methods_length; i++) {
1859 Method* method = methods->at(i);
1860 if (want_constructor && !method->is_object_constructor()) {
1861 continue;
1862 }
1863 if (!want_constructor &&
1864 (method->is_object_constructor() || method->is_class_initializer() ||
1865 method->is_overpass())) {
1866 continue;
1867 }
1868 if (publicOnly && !method->is_public()) {
1869 continue;
1870 }
1871 idnums->push(method->method_idnum());
1872 ++num_methods;
1873 }
1874
1875 // Allocate result
1876 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1877 objArrayHandle result (THREAD, r);
1878
1879 // Now just put the methods that we selected above, but go by their idnum
1880 // in case of redefinition. The methods can be redefined at any safepoint,
1881 // so above when allocating the oop array and below when creating reflect
1882 // objects.
1883 for (int i = 0; i < num_methods; i++) {
1884 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1885 if (method.is_null()) {
1886 // Method may have been deleted and seems this API can handle null
1887 // Otherwise should probably put a method that throws NSME
1888 result->obj_at_put(i, nullptr);
1889 } else {
1890 oop m;
1891 if (want_constructor) {
1892 assert(method->is_object_constructor(), "must be");
1893 m = Reflection::new_constructor(method, CHECK_NULL);
1894 } else {
1895 m = Reflection::new_method(method, false, CHECK_NULL);
1896 }
1897 result->obj_at_put(i, m);
1898 }
1899 }
1900
1901 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1902 }
1903
1904 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1905 {
1906 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1907 /*want_constructor*/ false,
1908 vmClasses::reflect_Method_klass(), THREAD);
1909 }
1910 JVM_END
1911
1912 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1913 {
1914 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1915 /*want_constructor*/ true,
1916 vmClasses::reflect_Constructor_klass(), THREAD);
1917 }
1918 JVM_END
1919
1920 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1921 {
1922 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1923 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1924 return c->has_nestmate_access_to(m, THREAD);
1925 }
1926 JVM_END
1927
1928 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1929 {
1930 // current is not a primitive or array class
1931 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1932 InstanceKlass* host = c->nest_host(THREAD);
1933 return (jclass) (host == nullptr ? nullptr :
1934 JNIHandles::make_local(THREAD, host->java_mirror()));
1935 }
1936 JVM_END
1937
1938 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1939 {
1940 // current is not a primitive or array class
1941 ResourceMark rm(THREAD);
1942 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1943 InstanceKlass* host = c->nest_host(THREAD);
1944
1945 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1946 c->external_name(), host->external_name());
1947 {
1948 JvmtiVMObjectAllocEventCollector oam;
1949 Array<u2>* members = host->nest_members();
1950 int length = members == nullptr ? 0 : members->length();
1951
1952 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1953
1954 // nest host is first in the array so make it one bigger
1955 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1956 length + 1, CHECK_NULL);
1957 objArrayHandle result(THREAD, r);
1958 result->obj_at_put(0, host->java_mirror());
1959 if (length != 0) {
1960 int count = 0;
1961 for (int i = 0; i < length; i++) {
1962 int cp_index = members->at(i);
1963 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1964 if (HAS_PENDING_EXCEPTION) {
1965 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1966 return nullptr; // propagate VMEs
1967 }
1968 if (log_is_enabled(Trace, class, nestmates)) {
1969 stringStream ss;
1970 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1971 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1972 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1973 log_trace(class, nestmates)("%s", ss.as_string());
1974 }
1975 CLEAR_PENDING_EXCEPTION;
1976 continue;
1977 }
1978 if (k->is_instance_klass()) {
1979 InstanceKlass* ik = InstanceKlass::cast(k);
1980 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1981 if (nest_host_k == host) {
1982 result->obj_at_put(count+1, k->java_mirror());
1983 count++;
1984 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1985 } else {
1986 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1987 ik->external_name(), nest_host_k->external_name());
1988 }
1989 } else {
1990 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1991 k->external_name());
1992 }
1993 }
1994 if (count < length) {
1995 // we had invalid entries so we need to compact the array
1996 log_trace(class, nestmates)(" - compacting array from length %d to %d",
1997 length + 1, count + 1);
1998
1999 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2000 count + 1, CHECK_NULL);
2001 objArrayHandle result2(THREAD, r2);
2002 for (int i = 0; i < count + 1; i++) {
2003 result2->obj_at_put(i, result->obj_at(i));
2004 }
2005 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2006 }
2007 }
2008 else {
2009 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
2010 }
2011 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2012 }
2013 }
2014 JVM_END
2015
2016 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2017 {
2018 oop mirror = JNIHandles::resolve_non_null(current);
2019 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2020 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2021
2022 ResourceMark rm(THREAD);
2023 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2024 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2025 if (ik->is_sealed()) {
2026 JvmtiVMObjectAllocEventCollector oam;
2027 Array<u2>* subclasses = ik->permitted_subclasses();
2028 int length = subclasses->length();
2029
2030 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2031
2032 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2033 length, CHECK_NULL);
2034 objArrayHandle result(THREAD, r);
2035 int count = 0;
2036 for (int i = 0; i < length; i++) {
2037 int cp_index = subclasses->at(i);
2038 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2039 if (HAS_PENDING_EXCEPTION) {
2040 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2041 return nullptr; // propagate VMEs
2042 }
2043 if (log_is_enabled(Trace, class, sealed)) {
2044 stringStream ss;
2045 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2046 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2047 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2048 log_trace(class, sealed)("%s", ss.as_string());
2049 }
2050
2051 CLEAR_PENDING_EXCEPTION;
2052 continue;
2053 }
2054 if (k->is_instance_klass()) {
2055 result->obj_at_put(count++, k->java_mirror());
2056 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2057 }
2058 }
2059 if (count < length) {
2060 // we had invalid entries so we need to compact the array
2061 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2062 count, CHECK_NULL);
2063 objArrayHandle result2(THREAD, r2);
2064 for (int i = 0; i < count; i++) {
2065 result2->obj_at_put(i, result->obj_at(i));
2066 }
2067 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2068 }
2069 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2070 } else {
2071 return nullptr;
2072 }
2073 }
2074 JVM_END
2075
2076 // Constant pool access //////////////////////////////////////////////////////////
2077
2078 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2079 {
2080 JvmtiVMObjectAllocEventCollector oam;
2081 oop mirror = JNIHandles::resolve_non_null(cls);
2082 // Return null for primitives and arrays
2083 if (!java_lang_Class::is_primitive(mirror)) {
2084 Klass* k = java_lang_Class::as_Klass(mirror);
2085 if (k->is_instance_klass()) {
2086 InstanceKlass* k_h = InstanceKlass::cast(k);
2087 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2088 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2089 return JNIHandles::make_local(THREAD, jcp());
2090 }
2091 }
2092 return nullptr;
2093 }
2094 JVM_END
2095
2096
2097 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2098 {
2099 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2100 return cp->length();
2101 }
2102 JVM_END
2103
2104
2105 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2106 {
2107 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2108 bounds_check(cp, index, CHECK_NULL);
2109 constantTag tag = cp->tag_at(index);
2110 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2111 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2112 }
2113 Klass* k = cp->klass_at(index, CHECK_NULL);
2114 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2115 }
2116 JVM_END
2117
2118 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2119 {
2120 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2121 bounds_check(cp, index, CHECK_NULL);
2122 constantTag tag = cp->tag_at(index);
2123 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2124 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2125 }
2126 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2127 if (k == nullptr) return nullptr;
2128 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2129 }
2130 JVM_END
2131
2132 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2133 constantTag tag = cp->tag_at(index);
2134 if (!tag.is_method() && !tag.is_interface_method()) {
2135 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2136 }
2137 int klass_ref = cp->uncached_klass_ref_index_at(index);
2138 Klass* k_o;
2139 if (force_resolution) {
2140 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2141 } else {
2142 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2143 if (k_o == nullptr) return nullptr;
2144 }
2145 InstanceKlass* k = InstanceKlass::cast(k_o);
2146 Symbol* name = cp->uncached_name_ref_at(index);
2147 Symbol* sig = cp->uncached_signature_ref_at(index);
2148 methodHandle m (THREAD, k->find_method(name, sig));
2149 if (m.is_null()) {
2150 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2151 }
2152 oop method;
2153 if (m->is_object_constructor()) {
2154 method = Reflection::new_constructor(m, CHECK_NULL);
2155 } else {
2156 method = Reflection::new_method(m, true, CHECK_NULL);
2157 }
2158 return JNIHandles::make_local(THREAD, method);
2159 }
2160
2161 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2162 {
2163 JvmtiVMObjectAllocEventCollector oam;
2164 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2165 bounds_check(cp, index, CHECK_NULL);
2166 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2167 return res;
2168 }
2169 JVM_END
2170
2171 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2172 {
2173 JvmtiVMObjectAllocEventCollector oam;
2174 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2175 bounds_check(cp, index, CHECK_NULL);
2176 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2177 return res;
2178 }
2179 JVM_END
2180
2181 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2182 constantTag tag = cp->tag_at(index);
2183 if (!tag.is_field()) {
2184 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2185 }
2186 int klass_ref = cp->uncached_klass_ref_index_at(index);
2187 Klass* k_o;
2188 if (force_resolution) {
2189 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2190 } else {
2191 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2192 if (k_o == nullptr) return nullptr;
2193 }
2194 InstanceKlass* k = InstanceKlass::cast(k_o);
2195 Symbol* name = cp->uncached_name_ref_at(index);
2196 Symbol* sig = cp->uncached_signature_ref_at(index);
2197 fieldDescriptor fd;
2198 Klass* target_klass = k->find_field(name, sig, &fd);
2199 if (target_klass == nullptr) {
2200 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2201 }
2202 oop field = Reflection::new_field(&fd, CHECK_NULL);
2203 return JNIHandles::make_local(THREAD, field);
2204 }
2205
2206 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2207 {
2208 JvmtiVMObjectAllocEventCollector oam;
2209 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2210 bounds_check(cp, index, CHECK_NULL);
2211 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2212 return res;
2213 }
2214 JVM_END
2215
2216 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2217 {
2218 JvmtiVMObjectAllocEventCollector oam;
2219 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2220 bounds_check(cp, index, CHECK_NULL);
2221 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2222 return res;
2223 }
2224 JVM_END
2225
2226 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2227 {
2228 JvmtiVMObjectAllocEventCollector oam;
2229 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2230 bounds_check(cp, index, CHECK_NULL);
2231 constantTag tag = cp->tag_at(index);
2232 if (!tag.is_field_or_method()) {
2233 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2234 }
2235 int klass_ref = cp->uncached_klass_ref_index_at(index);
2236 Symbol* klass_name = cp->klass_name_at(klass_ref);
2237 Symbol* member_name = cp->uncached_name_ref_at(index);
2238 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2239 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2240 objArrayHandle dest(THREAD, dest_o);
2241 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2242 dest->obj_at_put(0, str());
2243 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2244 dest->obj_at_put(1, str());
2245 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2246 dest->obj_at_put(2, str());
2247 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2248 }
2249 JVM_END
2250
2251 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2252 {
2253 JvmtiVMObjectAllocEventCollector oam;
2254 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2255 bounds_check(cp, index, CHECK_0);
2256 constantTag tag = cp->tag_at(index);
2257 if (!tag.is_field_or_method()) {
2258 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2259 }
2260 return (jint) cp->uncached_klass_ref_index_at(index);
2261 }
2262 JVM_END
2263
2264 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2265 {
2266 JvmtiVMObjectAllocEventCollector oam;
2267 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2268 bounds_check(cp, index, CHECK_0);
2269 constantTag tag = cp->tag_at(index);
2270 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2271 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2272 }
2273 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2274 }
2275 JVM_END
2276
2277 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2278 {
2279 JvmtiVMObjectAllocEventCollector oam;
2280 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2281 bounds_check(cp, index, CHECK_NULL);
2282 constantTag tag = cp->tag_at(index);
2283 if (!tag.is_name_and_type()) {
2284 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2285 }
2286 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2287 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2288 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2289 objArrayHandle dest(THREAD, dest_o);
2290 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2291 dest->obj_at_put(0, str());
2292 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2293 dest->obj_at_put(1, str());
2294 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2295 }
2296 JVM_END
2297
2298 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2299 {
2300 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2301 bounds_check(cp, index, CHECK_0);
2302 constantTag tag = cp->tag_at(index);
2303 if (!tag.is_int()) {
2304 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2305 }
2306 return cp->int_at(index);
2307 }
2308 JVM_END
2309
2310 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2311 {
2312 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2313 bounds_check(cp, index, CHECK_(0L));
2314 constantTag tag = cp->tag_at(index);
2315 if (!tag.is_long()) {
2316 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2317 }
2318 return cp->long_at(index);
2319 }
2320 JVM_END
2321
2322 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2323 {
2324 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2325 bounds_check(cp, index, CHECK_(0.0f));
2326 constantTag tag = cp->tag_at(index);
2327 if (!tag.is_float()) {
2328 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2329 }
2330 return cp->float_at(index);
2331 }
2332 JVM_END
2333
2334 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2335 {
2336 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2337 bounds_check(cp, index, CHECK_(0.0));
2338 constantTag tag = cp->tag_at(index);
2339 if (!tag.is_double()) {
2340 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2341 }
2342 return cp->double_at(index);
2343 }
2344 JVM_END
2345
2346 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2347 {
2348 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2349 bounds_check(cp, index, CHECK_NULL);
2350 constantTag tag = cp->tag_at(index);
2351 if (!tag.is_string()) {
2352 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2353 }
2354 oop str = cp->string_at(index, CHECK_NULL);
2355 return (jstring) JNIHandles::make_local(THREAD, str);
2356 }
2357 JVM_END
2358
2359 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2360 {
2361 JvmtiVMObjectAllocEventCollector oam;
2362 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2363 bounds_check(cp, index, CHECK_NULL);
2364 constantTag tag = cp->tag_at(index);
2365 if (!tag.is_symbol()) {
2366 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2367 }
2368 Symbol* sym = cp->symbol_at(index);
2369 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2370 return (jstring) JNIHandles::make_local(THREAD, str());
2371 }
2372 JVM_END
2373
2374 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2375 {
2376 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2377 bounds_check(cp, index, CHECK_0);
2378 constantTag tag = cp->tag_at(index);
2379 jbyte result = tag.value();
2380 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2381 // they are changed to the corresponding tags from the JVM spec, so that java code in
2382 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2383 if (tag.is_klass_or_reference()) {
2384 result = JVM_CONSTANT_Class;
2385 } else if (tag.is_string_index()) {
2386 result = JVM_CONSTANT_String;
2387 } else if (tag.is_method_type_in_error()) {
2388 result = JVM_CONSTANT_MethodType;
2389 } else if (tag.is_method_handle_in_error()) {
2390 result = JVM_CONSTANT_MethodHandle;
2391 } else if (tag.is_dynamic_constant_in_error()) {
2392 result = JVM_CONSTANT_Dynamic;
2393 }
2394 return result;
2395 }
2396 JVM_END
2397
2398 // Assertion support. //////////////////////////////////////////////////////////
2399
2400 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2401 assert(cls != nullptr, "bad class");
2402
2403 oop r = JNIHandles::resolve(cls);
2404 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2405 if (java_lang_Class::is_primitive(r)) return false;
2406
2407 Klass* k = java_lang_Class::as_Klass(r);
2408 assert(k->is_instance_klass(), "must be an instance klass");
2409 if (!k->is_instance_klass()) return false;
2410
2411 ResourceMark rm(THREAD);
2412 const char* name = k->name()->as_C_string();
2413 bool system_class = k->class_loader() == nullptr;
2414 return JavaAssertions::enabled(name, system_class);
2415
2416 JVM_END
2417
2418
2419 // Return a new AssertionStatusDirectives object with the fields filled in with
2420 // command-line assertion arguments (i.e., -ea, -da).
2421 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2422 JvmtiVMObjectAllocEventCollector oam;
2423 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2424 return JNIHandles::make_local(THREAD, asd);
2425 JVM_END
2426
2427 // Verification ////////////////////////////////////////////////////////////////////////////////
2428
2429 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2430
2431 // RedefineClasses support: bug 6214132 caused verification to fail.
2432 // All functions from this section should call the jvmtiThreadSate function:
2433 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2434 // The function returns a Klass* of the _scratch_class if the verifier
2435 // was invoked in the middle of the class redefinition.
2436 // Otherwise it returns its argument value which is the _the_class Klass*.
2437 // Please, refer to the description in the jvmtiThreadState.hpp.
2438
2439 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2440 oop mirror = JNIHandles::resolve_non_null(cls);
2441 if (java_lang_Class::is_primitive(mirror)) {
2442 return JNI_FALSE;
2443 }
2444 Klass* k = java_lang_Class::as_Klass(mirror);
2445 // This isn't necessary since answer is the same since redefinition
2446 // has already checked this matches for the scratch class.
2447 // k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2448 jboolean result = k->is_interface();
2449 assert(!result || k->is_instance_klass(),
2450 "all interfaces are instance types");
2451 return result;
2452 JVM_END
2453
2454
2455 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2456 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2457 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2458 return k->name()->as_utf8();
2459 JVM_END
2460
2461
2462 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2463 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2464 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2465 // types will have length zero if this is not an InstanceKlass
2466 // (length is determined by call to JVM_GetClassCPEntriesCount)
2467 if (k->is_instance_klass()) {
2468 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2469 for (int index = cp->length() - 1; index >= 0; index--) {
2470 constantTag tag = cp->tag_at(index);
2471 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2472 }
2473 }
2474 JVM_END
2475
2476
2477 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2478 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2479 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2480 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2481 JVM_END
2482
2483
2484 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2485 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2486 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2487 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2488 JVM_END
2489
2490
2491 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2492 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2493 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2494 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2495 JVM_END
2496
2497
2498 // The following methods, used for the verifier, are never called with
2499 // array klasses, so a direct cast to InstanceKlass is safe.
2500 // Typically, these methods are called in a loop with bounds determined
2501 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2502 // zero for arrays.
2503 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2504 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2505 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2506 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2507 int length = method->checked_exceptions_length();
2508 if (length > 0) {
2509 CheckedExceptionElement* table= method->checked_exceptions_start();
2510 for (int i = 0; i < length; i++) {
2511 exceptions[i] = table[i].class_cp_index;
2512 }
2513 }
2514 JVM_END
2515
2516
2517 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2518 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2519 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2520 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2521 return method->checked_exceptions_length();
2522 JVM_END
2523
2524
2525 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2526 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2527 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2528 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2529 memcpy(code, method->code_base(), method->code_size());
2530 JVM_END
2531
2532
2533 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2534 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2535 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2536 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2537 return method->code_size();
2538 JVM_END
2539
2540
2541 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2542 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2543 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2544 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2545 ExceptionTable extable(method);
2546 entry->start_pc = extable.start_pc(entry_index);
2547 entry->end_pc = extable.end_pc(entry_index);
2548 entry->handler_pc = extable.handler_pc(entry_index);
2549 entry->catchType = extable.catch_type_index(entry_index);
2550 JVM_END
2551
2552
2553 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2554 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2555 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2556 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2557 return method->exception_table_length();
2558 JVM_END
2559
2560
2561 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2562 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2563 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2564 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2565 return method->access_flags().as_method_flags();
2566 JVM_END
2567
2568
2569 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2570 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2571 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2572 return InstanceKlass::cast(k)->field_access_flags(field_index);
2573 JVM_END
2574
2575
2576 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2577 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2578 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2579 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2580 return method->max_locals();
2581 JVM_END
2582
2583
2584 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2585 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2586 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2587 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2588 return method->size_of_parameters();
2589 JVM_END
2590
2591
2592 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2593 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2594 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2595 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2596 return method->verifier_max_stack();
2597 JVM_END
2598
2599
2600 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2601 ResourceMark rm(THREAD);
2602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2603 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2604 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2605 return method->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 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2612 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2613 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2614 return method->is_overpass();
2615 JVM_END
2616
2617 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2618 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2619 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2620 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2621 return method->name()->as_utf8();
2622 JVM_END
2623
2624
2625 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2626 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2627 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2628 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2629 return method->signature()->as_utf8();
2630 JVM_END
2631
2632 /**
2633 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2634 * read entries in the constant pool. Since the old verifier always
2635 * works on a copy of the code, it will not see any rewriting that
2636 * may possibly occur in the middle of verification. So it is important
2637 * that nothing it calls tries to use the cpCache instead of the raw
2638 * constant pool, so we must use cp->uncached_x methods when appropriate.
2639 */
2640 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2641 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2642 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2643 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2644 switch (cp->tag_at(cp_index).value()) {
2645 case JVM_CONSTANT_Fieldref:
2646 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2647 default:
2648 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2649 }
2650 ShouldNotReachHere();
2651 return nullptr;
2652 JVM_END
2653
2654
2655 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2656 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2657 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2658 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2659 switch (cp->tag_at(cp_index).value()) {
2660 case JVM_CONSTANT_InterfaceMethodref:
2661 case JVM_CONSTANT_Methodref:
2662 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2663 default:
2664 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2665 }
2666 ShouldNotReachHere();
2667 return nullptr;
2668 JVM_END
2669
2670
2671 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2672 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2673 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2674 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2675 switch (cp->tag_at(cp_index).value()) {
2676 case JVM_CONSTANT_InterfaceMethodref:
2677 case JVM_CONSTANT_Methodref:
2678 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2679 default:
2680 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2681 }
2682 ShouldNotReachHere();
2683 return nullptr;
2684 JVM_END
2685
2686
2687 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2688 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2689 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2690 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2691 switch (cp->tag_at(cp_index).value()) {
2692 case JVM_CONSTANT_Fieldref:
2693 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2694 default:
2695 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2696 }
2697 ShouldNotReachHere();
2698 return nullptr;
2699 JVM_END
2700
2701
2702 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2703 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2704 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2705 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2706 Symbol* classname = cp->klass_name_at(cp_index);
2707 return classname->as_utf8();
2708 JVM_END
2709
2710
2711 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2712 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2713 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2714 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2715 switch (cp->tag_at(cp_index).value()) {
2716 case JVM_CONSTANT_Fieldref: {
2717 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2718 Symbol* classname = cp->klass_name_at(class_index);
2719 return classname->as_utf8();
2720 }
2721 default:
2722 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2723 }
2724 ShouldNotReachHere();
2725 return nullptr;
2726 JVM_END
2727
2728
2729 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2730 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2731 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2732 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2733 switch (cp->tag_at(cp_index).value()) {
2734 case JVM_CONSTANT_Methodref:
2735 case JVM_CONSTANT_InterfaceMethodref: {
2736 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2737 Symbol* classname = cp->klass_name_at(class_index);
2738 return classname->as_utf8();
2739 }
2740 default:
2741 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2742 }
2743 ShouldNotReachHere();
2744 return nullptr;
2745 JVM_END
2746
2747
2748 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2749 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2750 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2751 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2752 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2753 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2754 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2755 switch (cp->tag_at(cp_index).value()) {
2756 case JVM_CONSTANT_Fieldref: {
2757 Symbol* name = cp->uncached_name_ref_at(cp_index);
2758 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2759 InstanceKlass* ik = InstanceKlass::cast(k_called);
2760 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2761 if (fs.name() == name && fs.signature() == signature) {
2762 return fs.access_flags().as_field_flags();
2763 }
2764 }
2765 return -1;
2766 }
2767 default:
2768 fatal("JVM_GetCPFieldModifiers: illegal constant");
2769 }
2770 ShouldNotReachHere();
2771 return 0;
2772 JVM_END
2773
2774
2775 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2776 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2777 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2778 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2779 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2780 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2781 switch (cp->tag_at(cp_index).value()) {
2782 case JVM_CONSTANT_Methodref:
2783 case JVM_CONSTANT_InterfaceMethodref: {
2784 Symbol* name = cp->uncached_name_ref_at(cp_index);
2785 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2786 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2787 int methods_count = methods->length();
2788 for (int i = 0; i < methods_count; i++) {
2789 Method* method = methods->at(i);
2790 if (method->name() == name && method->signature() == signature) {
2791 return method->access_flags().as_method_flags();
2792 }
2793 }
2794 return -1;
2795 }
2796 default:
2797 fatal("JVM_GetCPMethodModifiers: illegal constant");
2798 }
2799 ShouldNotReachHere();
2800 return 0;
2801 JVM_END
2802
2803
2804 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2805
2806 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2807 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2808 JVM_END
2809
2810
2811 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2812 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2813 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2814 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2815 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2816 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2817 JVM_END
2818
2819 // Printing support //////////////////////////////////////////////////
2820 extern "C" {
2821
2822 ATTRIBUTE_PRINTF(3, 0)
2823 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2824 // Reject count values that are negative signed values converted to
2825 // unsigned; see bug 4399518, 4417214
2826 if ((intptr_t)count <= 0) return -1;
2827
2828 int result = os::vsnprintf(str, count, fmt, args);
2829 if (result > 0 && (size_t)result >= count) {
2830 result = -1;
2831 }
2832
2833 return result;
2834 }
2835
2836 ATTRIBUTE_PRINTF(3, 4)
2837 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2838 va_list args;
2839 int len;
2840 va_start(args, fmt);
2841 len = jio_vsnprintf(str, count, fmt, args);
2842 va_end(args);
2843 return len;
2844 }
2845
2846 ATTRIBUTE_PRINTF(2, 3)
2847 int jio_fprintf(FILE* f, const char *fmt, ...) {
2848 int len;
2849 va_list args;
2850 va_start(args, fmt);
2851 len = jio_vfprintf(f, fmt, args);
2852 va_end(args);
2853 return len;
2854 }
2855
2856 ATTRIBUTE_PRINTF(2, 0)
2857 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2858 if (Arguments::vfprintf_hook() != nullptr) {
2859 return Arguments::vfprintf_hook()(f, fmt, args);
2860 } else {
2861 return vfprintf(f, fmt, args);
2862 }
2863 }
2864
2865 ATTRIBUTE_PRINTF(1, 2)
2866 JNIEXPORT int jio_printf(const char *fmt, ...) {
2867 int len;
2868 va_list args;
2869 va_start(args, fmt);
2870 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2871 va_end(args);
2872 return len;
2873 }
2874
2875 // HotSpot specific jio method
2876 void jio_print(const char* s, size_t len) {
2877 // Try to make this function as atomic as possible.
2878 if (Arguments::vfprintf_hook() != nullptr) {
2879 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2880 } else {
2881 // Make an unused local variable to avoid warning from gcc compiler.
2882 bool dummy = os::write(defaultStream::output_fd(), s, len);
2883 }
2884 }
2885
2886 } // Extern C
2887
2888 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2889
2890 // In most of the JVM thread support functions we need to access the
2891 // thread through a ThreadsListHandle to prevent it from exiting and
2892 // being reclaimed while we try to operate on it. The exceptions to this
2893 // rule are when operating on the current thread, or if the monitor of
2894 // the target java.lang.Thread is locked at the Java level - in both
2895 // cases the target cannot exit.
2896
2897 static void thread_entry(JavaThread* thread, TRAPS) {
2898 HandleMark hm(THREAD);
2899 Handle obj(THREAD, thread->threadObj());
2900 JavaValue result(T_VOID);
2901 JavaCalls::call_virtual(&result,
2902 obj,
2903 vmClasses::Thread_klass(),
2904 vmSymbols::run_method_name(),
2905 vmSymbols::void_method_signature(),
2906 THREAD);
2907 }
2908
2909
2910 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2911 #if INCLUDE_CDS
2912 if (CDSConfig::allow_only_single_java_thread()) {
2913 // During java -Xshare:dump, if we allow multiple Java threads to
2914 // execute in parallel, symbols and classes may be loaded in
2915 // random orders which will make the resulting CDS archive
2916 // non-deterministic.
2917 //
2918 // Lucikly, during java -Xshare:dump, it's important to run only
2919 // the code in the main Java thread (which is NOT started here) that
2920 // creates the module graph, etc. It's safe to not start the other
2921 // threads which are launched by class static initializers
2922 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2923 if (log_is_enabled(Info, aot)) {
2924 ResourceMark rm;
2925 oop t = JNIHandles::resolve_non_null(jthread);
2926 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2927 }
2928 return;
2929 }
2930 #endif
2931 JavaThread *native_thread = nullptr;
2932
2933 // We cannot hold the Threads_lock when we throw an exception,
2934 // due to rank ordering issues. Example: we might need to grab the
2935 // Heap_lock while we construct the exception.
2936 bool throw_illegal_thread_state = false;
2937
2938 // We must release the Threads_lock before we can post a jvmti event
2939 // in Thread::start.
2940 {
2941 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2942 // Ensure that the C++ Thread and OSThread structures aren't freed before
2943 // we operate.
2944 MutexLocker ml(Threads_lock);
2945
2946 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2947 // re-starting an already started thread, so we should usually find
2948 // that the JavaThread is null. However for a JNI attached thread
2949 // there is a small window between the Thread object being created
2950 // (with its JavaThread set) and the update to its threadStatus, so we
2951 // have to check for this
2952 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2953 throw_illegal_thread_state = true;
2954 } else {
2955 jlong size =
2956 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2957 // Allocate the C++ Thread structure and create the native thread. The
2958 // stack size retrieved from java is 64-bit signed, but the constructor takes
2959 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2960 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2961 // - Avoid passing negative values which would result in really large stacks.
2962 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2963 size_t sz = size > 0 ? (size_t) size : 0;
2964 native_thread = new JavaThread(&thread_entry, sz);
2965
2966 // At this point it may be possible that no osthread was created for the
2967 // JavaThread due to lack of memory. Check for this situation and throw
2968 // an exception if necessary. Eventually we may want to change this so
2969 // that we only grab the lock if the thread was created successfully -
2970 // then we can also do this check and throw the exception in the
2971 // JavaThread constructor.
2972 if (native_thread->osthread() != nullptr) {
2973 // Note: the current thread is not being used within "prepare".
2974 native_thread->prepare(jthread);
2975 }
2976 }
2977 }
2978
2979 if (throw_illegal_thread_state) {
2980 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2981 }
2982
2983 assert(native_thread != nullptr, "Starting null thread?");
2984
2985 if (native_thread->osthread() == nullptr) {
2986 ResourceMark rm(thread);
2987 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2988 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2989 // No one should hold a reference to the 'native_thread'.
2990 native_thread->smr_delete();
2991 if (JvmtiExport::should_post_resource_exhausted()) {
2992 JvmtiExport::post_resource_exhausted(
2993 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2994 os::native_thread_creation_failed_msg());
2995 }
2996 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2997 os::native_thread_creation_failed_msg());
2998 }
2999
3000 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3001
3002 Thread::start(native_thread);
3003
3004 JVM_END
3005
3006
3007 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3008 ThreadsListHandle tlh(thread);
3009 oop java_thread = nullptr;
3010 JavaThread* receiver = nullptr;
3011 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3012 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3013
3014 if (is_alive) {
3015 // jthread refers to a live JavaThread.
3016 Thread::set_priority(receiver, (ThreadPriority)prio);
3017 }
3018 // Implied else: If the JavaThread hasn't started yet, then the
3019 // priority set in the java.lang.Thread object above will be pushed
3020 // down when it does start.
3021 JVM_END
3022
3023
3024 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3025 HOTSPOT_THREAD_YIELD();
3026 os::naked_yield();
3027 JVM_END
3028
3029 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3030 if (nanos < 0) {
3031 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3032 }
3033
3034 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3035 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3036 }
3037
3038 // Save current thread state and restore it at the end of this block.
3039 // And set new thread state to SLEEPING.
3040 JavaThreadSleepState jtss(thread);
3041
3042 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3043
3044 if (nanos == 0) {
3045 os::naked_yield();
3046 } else {
3047 ThreadState old_state = thread->osthread()->get_state();
3048 thread->osthread()->set_state(SLEEPING);
3049 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3050 // An asynchronous exception could have been thrown on
3051 // us while we were sleeping. We do not overwrite those.
3052 if (!HAS_PENDING_EXCEPTION) {
3053 HOTSPOT_THREAD_SLEEP_END(1);
3054 if (!thread->has_async_exception_condition()) {
3055 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3056 // to properly restore the thread state. That's likely wrong.
3057 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3058 }
3059 }
3060 }
3061 thread->osthread()->set_state(old_state);
3062 }
3063 HOTSPOT_THREAD_SLEEP_END(0);
3064 JVM_END
3065
3066 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3067 oop jthread = thread->threadObj();
3068 assert(jthread != nullptr, "no current carrier thread!");
3069 return JNIHandles::make_local(THREAD, jthread);
3070 JVM_END
3071
3072 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3073 oop theThread = thread->vthread();
3074 assert(theThread != (oop)nullptr, "no current thread!");
3075 return JNIHandles::make_local(THREAD, theThread);
3076 JVM_END
3077
3078 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3079 jobject theThread))
3080 oop threadObj = JNIHandles::resolve(theThread);
3081 thread->set_vthread(threadObj);
3082
3083 // Set _monitor_owner_id of new current Thread
3084 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3085
3086 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3087 JVM_END
3088
3089 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3090 return ThreadIdentifier::unsafe_offset();
3091 JVM_END
3092
3093 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3094 ThreadsListHandle tlh(thread);
3095 JavaThread* receiver = nullptr;
3096 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3097 if (is_alive) {
3098 // jthread refers to a live JavaThread.
3099 receiver->interrupt();
3100 }
3101 JVM_END
3102
3103 // Return true iff the current thread has locked the object passed in
3104
3105 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3106 if (obj == nullptr) {
3107 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3108 }
3109 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3110 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3111 JVM_END
3112
3113 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3114 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3115 return JNIHandles::make_local(THREAD, trace);
3116 JVM_END
3117
3118 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3119 #if INCLUDE_JVMTI
3120 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3121 return JNIHandles::make_local(THREAD, snapshot);
3122 #else
3123 THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
3124 #endif
3125 JVM_END
3126
3127 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3128 // We don't use a ThreadsListHandle here because the current thread
3129 // must be alive.
3130 oop java_thread = JNIHandles::resolve_non_null(jthread);
3131 JavaThread* thr = java_lang_Thread::thread(java_thread);
3132 if (thread == thr && !thr->has_attached_via_jni()) {
3133 // Thread naming is only supported for the current thread and
3134 // we don't set the name of an attached thread to avoid stepping
3135 // on other programs.
3136 ResourceMark rm(thread);
3137 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3138 os::set_native_thread_name(thread_name);
3139 }
3140 JVM_END
3141
3142 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3143 oop theCache = thread->scopedValueCache();
3144 return JNIHandles::make_local(THREAD, theCache);
3145 JVM_END
3146
3147 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3148 jobject theCache))
3149 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3150 thread->set_scopedValueCache(objs);
3151 JVM_END
3152
3153
3154 // java.lang.Package ////////////////////////////////////////////////////////////////
3155
3156
3157 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3158 ResourceMark rm(THREAD);
3159 JvmtiVMObjectAllocEventCollector oam;
3160 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3161 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3162 return (jstring) JNIHandles::make_local(THREAD, result);
3163 JVM_END
3164
3165
3166 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3167 JvmtiVMObjectAllocEventCollector oam;
3168 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3169 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3170 JVM_END
3171
3172
3173 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3174
3175
3176 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3177 MonitorLocker ml(Heap_lock);
3178 oop ref = Universe::reference_pending_list();
3179 if (ref != nullptr) {
3180 Universe::clear_reference_pending_list();
3181 }
3182 return JNIHandles::make_local(THREAD, ref);
3183 JVM_END
3184
3185 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3186 MonitorLocker ml(Heap_lock);
3187 return Universe::has_reference_pending_list();
3188 JVM_END
3189
3190 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3191 MonitorLocker ml(Heap_lock);
3192 while (!Universe::has_reference_pending_list()) {
3193 ml.wait();
3194 }
3195 JVM_END
3196
3197 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3198 oop ref_oop = JNIHandles::resolve_non_null(ref);
3199 // PhantomReference has its own implementation of get().
3200 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3201 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3202 return JNIHandles::make_local(THREAD, referent);
3203 JVM_END
3204
3205 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3206 oop ref_oop = JNIHandles::resolve_non_null(ref);
3207 // PhantomReference has its own implementation of refersTo().
3208 // See: JVM_PhantomReferenceRefersTo
3209 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3210 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3211 return referent == JNIHandles::resolve(o);
3212 JVM_END
3213
3214 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3215 oop ref_oop = JNIHandles::resolve_non_null(ref);
3216 // FinalReference has it's own implementation of clear().
3217 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3218 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3219 // If the referent has already been cleared then done.
3220 // However, if the referent is dead but has not yet been cleared by
3221 // concurrent reference processing, it should NOT be cleared here.
3222 // Instead, clearing should be left to the GC. Clearing it here could
3223 // detectably lose an expected notification, which is impossible with
3224 // STW reference processing. The clearing in enqueue() doesn't have
3225 // this problem, since the enqueue covers the notification, but it's not
3226 // worth the effort to handle that case specially.
3227 return;
3228 }
3229 java_lang_ref_Reference::clear_referent(ref_oop);
3230 JVM_END
3231
3232
3233 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3234
3235
3236 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3237 oop ref_oop = JNIHandles::resolve_non_null(ref);
3238 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3239 return referent == JNIHandles::resolve(o);
3240 JVM_END
3241
3242
3243 // ObjectInputStream ///////////////////////////////////////////////////////////////
3244
3245 // Return the first user-defined class loader up the execution stack, or null
3246 // if only code from the bootstrap or platform class loader is on the stack.
3247
3248 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3249 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3250 InstanceKlass* ik = vfst.method()->method_holder();
3251 oop loader = ik->class_loader();
3252 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3253 return JNIHandles::make_local(THREAD, loader);
3254 }
3255 }
3256 return nullptr;
3257 JVM_END
3258
3259
3260 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3261
3262
3263 // resolve array handle and check arguments
3264 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3265 if (arr == nullptr) {
3266 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3267 }
3268 oop a = JNIHandles::resolve_non_null(arr);
3269 if (!a->is_array()) {
3270 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3271 } else if (type_array_only && !a->is_typeArray()) {
3272 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3273 }
3274 return arrayOop(a);
3275 }
3276
3277
3278 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3279 arrayOop a = check_array(env, arr, false, CHECK_0);
3280 return a->length();
3281 JVM_END
3282
3283
3284 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3285 JvmtiVMObjectAllocEventCollector oam;
3286 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3287 jvalue value;
3288 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3289 oop box = Reflection::box(&value, type, CHECK_NULL);
3290 return JNIHandles::make_local(THREAD, box);
3291 JVM_END
3292
3293
3294 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3295 jvalue value;
3296 value.i = 0; // to initialize value before getting used in CHECK
3297 arrayOop a = check_array(env, arr, true, CHECK_(value));
3298 assert(a->is_typeArray(), "just checking");
3299 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3300 BasicType wide_type = (BasicType) wCode;
3301 if (type != wide_type) {
3302 Reflection::widen(&value, type, wide_type, CHECK_(value));
3303 }
3304 return value;
3305 JVM_END
3306
3307
3308 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3309 arrayOop a = check_array(env, arr, false, CHECK);
3310 oop box = JNIHandles::resolve(val);
3311 jvalue value;
3312 value.i = 0; // to initialize value before getting used in CHECK
3313 BasicType value_type;
3314 if (a->is_objArray()) {
3315 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3316 value_type = Reflection::unbox_for_regular_object(box, &value);
3317 } else {
3318 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3319 }
3320 Reflection::array_set(&value, a, index, value_type, CHECK);
3321 JVM_END
3322
3323
3324 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3325 arrayOop a = check_array(env, arr, true, CHECK);
3326 assert(a->is_typeArray(), "just checking");
3327 BasicType value_type = (BasicType) vCode;
3328 Reflection::array_set(&v, a, index, value_type, CHECK);
3329 JVM_END
3330
3331
3332 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3333 JvmtiVMObjectAllocEventCollector oam;
3334 oop element_mirror = JNIHandles::resolve(eltClass);
3335 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3336 return JNIHandles::make_local(THREAD, result);
3337 JVM_END
3338
3339
3340 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3341 JvmtiVMObjectAllocEventCollector oam;
3342 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3343 oop element_mirror = JNIHandles::resolve(eltClass);
3344 assert(dim_array->is_typeArray(), "just checking");
3345 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3346 return JNIHandles::make_local(THREAD, result);
3347 JVM_END
3348
3349
3350 // Library support ///////////////////////////////////////////////////////////////////////////
3351
3352 JVM_LEAF(void*, JVM_LoadZipLibrary())
3353 return ZipLibrary::handle();
3354 JVM_END
3355
3356 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3357 //%note jvm_ct
3358 char ebuf[1024];
3359 void *load_result;
3360 {
3361 ThreadToNativeFromVM ttnfvm(thread);
3362 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3363 }
3364 if (load_result == nullptr) {
3365 if (throwException) {
3366 char msg[1024];
3367 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3368 // Since 'ebuf' may contain a string encoded using
3369 // platform encoding scheme, we need to pass
3370 // Exceptions::unsafe_to_utf8 to the new_exception method
3371 // as the last argument. See bug 6367357.
3372 Handle h_exception =
3373 Exceptions::new_exception(thread,
3374 vmSymbols::java_lang_UnsatisfiedLinkError(),
3375 msg, Exceptions::unsafe_to_utf8);
3376
3377 THROW_HANDLE_NULL(h_exception);
3378 } else {
3379 log_info(library)("Failed to load library %s", name);
3380 return load_result;
3381 }
3382 }
3383 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3384 return load_result;
3385 JVM_END
3386
3387
3388 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3389 os::dll_unload(handle);
3390 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3391 JVM_END
3392
3393
3394 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3395 void* find_result = os::dll_lookup(handle, name);
3396 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3397 find_result != nullptr ? "Found" : "Failed to find",
3398 name, p2i(handle));
3399 return find_result;
3400 JVM_END
3401
3402
3403 // JNI version ///////////////////////////////////////////////////////////////////////////////
3404
3405 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3406 return Threads::is_supported_jni_version_including_1_1(version);
3407 JVM_END
3408
3409
3410 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3411 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3412 JVM_END
3413
3414 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3415 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3416 JVM_END
3417
3418 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3419 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3420 JVM_END
3421
3422 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3423 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3424 JVM_END
3425
3426 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3427 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3428 JVM_END
3429
3430 // String support ///////////////////////////////////////////////////////////////////////////
3431
3432 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3433 JvmtiVMObjectAllocEventCollector oam;
3434 if (str == nullptr) return nullptr;
3435 oop string = JNIHandles::resolve_non_null(str);
3436 oop result = StringTable::intern(string, CHECK_NULL);
3437 return (jstring) JNIHandles::make_local(THREAD, result);
3438 JVM_END
3439
3440
3441 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3442
3443 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3444 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3445 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3446 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3447 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3448 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3449
3450
3451 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3452 VM_Exit::block_if_vm_exited();
3453 return new PlatformMutex();
3454 }
3455
3456
3457 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3458 VM_Exit::block_if_vm_exited();
3459 delete ((PlatformMutex*) mon);
3460 }
3461
3462
3463 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3464 VM_Exit::block_if_vm_exited();
3465 ((PlatformMutex*) mon)->lock();
3466 return 0;
3467 }
3468
3469
3470 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3471 VM_Exit::block_if_vm_exited();
3472 ((PlatformMutex*) mon)->unlock();
3473 }
3474
3475
3476 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3477
3478 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3479 Handle loader, jboolean throwError, TRAPS) {
3480 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3481
3482 // Check if we should initialize the class
3483 if (init && klass->is_instance_klass()) {
3484 klass->initialize(CHECK_NULL);
3485 }
3486 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3487 }
3488
3489
3490 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3491
3492 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3493 Handle method_handle;
3494 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3495 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3496 Handle receiver(THREAD, JNIHandles::resolve(obj));
3497 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3498 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3499
3500 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3501 jobject res = JNIHandles::make_local(THREAD, result);
3502 if (JvmtiExport::should_post_vm_object_alloc()) {
3503 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3504 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3505 if (java_lang_Class::is_primitive(ret_type)) {
3506 // Only for primitive type vm allocates memory for java object.
3507 // See box() method.
3508 JvmtiExport::post_vm_object_alloc(thread, result);
3509 }
3510 }
3511 return res;
3512 } else {
3513 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3514 }
3515 JVM_END
3516
3517
3518 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3519 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3520 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3521 oop constructor_mirror = JNIHandles::resolve(c);
3522 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3523 jobject res = JNIHandles::make_local(THREAD, result);
3524 if (JvmtiExport::should_post_vm_object_alloc()) {
3525 JvmtiExport::post_vm_object_alloc(thread, result);
3526 }
3527 return res;
3528 JVM_END
3529
3530 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3531 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3532 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3533 JVM_END
3534
3535 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3536 jclass caller,
3537 jstring interfaceMethodName,
3538 jobject factoryType,
3539 jobject interfaceMethodType,
3540 jobject implementationMember,
3541 jobject dynamicMethodType,
3542 jclass lambdaProxyClass))
3543 #if INCLUDE_CDS
3544 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3545 return;
3546 }
3547
3548 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3549 if (caller_ik->is_hidden()) {
3550 // Hidden classes not of type lambda proxy classes are currently not being archived.
3551 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3552 // registered for archiving.
3553 return;
3554 }
3555 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3556 assert(lambda_ik->is_hidden(), "must be a hidden class");
3557 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3558
3559 Symbol* interface_method_name = nullptr;
3560 if (interfaceMethodName != nullptr) {
3561 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3562 }
3563 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3564 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3565
3566 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3567 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3568
3569 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3570 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3571 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3572
3573 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3574 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3575
3576 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3577 interface_method_type, m, dynamic_method_type, THREAD);
3578 #endif // INCLUDE_CDS
3579 JVM_END
3580
3581 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3582 jclass caller,
3583 jstring interfaceMethodName,
3584 jobject factoryType,
3585 jobject interfaceMethodType,
3586 jobject implementationMember,
3587 jobject dynamicMethodType))
3588 #if INCLUDE_CDS
3589
3590 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3591 implementationMember == nullptr || dynamicMethodType == nullptr) {
3592 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3593 }
3594
3595 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3596 if (!caller_ik->in_aot_cache()) {
3597 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3598 return nullptr;
3599 }
3600
3601 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3602 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3603 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3604
3605 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3606 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3607
3608 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3609 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3610 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3611
3612 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3613 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3614
3615 InstanceKlass* loaded_lambda =
3616 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3617 interface_method_type, m, dynamic_method_type,
3618 CHECK_(nullptr));
3619 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3620 #else
3621 return nullptr;
3622 #endif // INCLUDE_CDS
3623 JVM_END
3624
3625 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3626 if (CDSConfig::is_dumping_static_archive()) {
3627 // We do this so that the default CDS archive can be deterministic.
3628 const char* release = VM_Version::vm_release();
3629 const char* dbg_level = VM_Version::jdk_debug_level();
3630 const char* version = VM_Version::internal_vm_info_string();
3631 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3632 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3633 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3634 seed += (jlong)VM_Version::vm_major_version();
3635 seed += (jlong)VM_Version::vm_minor_version();
3636 seed += (jlong)VM_Version::vm_security_version();
3637 seed += (jlong)VM_Version::vm_patch_version();
3638 if (seed == 0) { // don't let this ever be zero.
3639 seed = 0x87654321;
3640 }
3641 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3642 return seed;
3643 } else {
3644 return 0;
3645 }
3646 JVM_END
3647
3648 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3649 return CDSConfig::get_status();
3650 JVM_END
3651
3652 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3653 #if INCLUDE_CDS
3654 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3655 if (line != nullptr) {
3656 ResourceMark rm(THREAD);
3657 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3658 char* c_line = java_lang_String::as_utf8_string(h_line());
3659 if (CDSConfig::is_dumping_dynamic_archive()) {
3660 // Note: LambdaFormInvokers::append take same format which is not
3661 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3662 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3663 }
3664 if (ClassListWriter::is_enabled()) {
3665 ClassListWriter w;
3666 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3667 }
3668 }
3669 #endif // INCLUDE_CDS
3670 JVM_END
3671
3672 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3673 #if INCLUDE_CDS
3674 ResourceMark rm(THREAD);
3675 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3676 char* file_name = java_lang_String::as_utf8_string(file_handle());
3677 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3678 #endif // INCLUDE_CDS
3679 JVM_END
3680
3681 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3682 #if INCLUDE_CDS
3683 ResourceMark rm(THREAD);
3684 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3685 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3686 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3687 #endif // INCLUDE_CDS
3688 JVM_END
3689
3690 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3691 #if INCLUDE_CDS
3692 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3693 if (!k->is_instance_klass()) {
3694 return false;
3695 } else {
3696 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3697 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3698 // This class will be cached in AOT-initialized state. No need for init barriers.
3699 return false;
3700 } else {
3701 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3702 // must emit barriers to ensure class initialization during production run.
3703 ResourceMark rm(THREAD);
3704 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3705 return true;
3706 }
3707 }
3708 #else
3709 return false;
3710 #endif // INCLUDE_CDS
3711 JVM_END
3712
3713 // Returns an array of all live Thread objects (VM internal JavaThreads,
3714 // jvmti agent threads, and JNI attaching threads are skipped)
3715 // See CR 6404306 regarding JNI attaching threads
3716 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3717 ResourceMark rm(THREAD);
3718 ThreadsListEnumerator tle(THREAD, false, false);
3719 JvmtiVMObjectAllocEventCollector oam;
3720
3721 int num_threads = tle.num_threads();
3722 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3723 objArrayHandle threads_ah(THREAD, r);
3724
3725 for (int i = 0; i < num_threads; i++) {
3726 Handle h = tle.get_threadObj(i);
3727 threads_ah->obj_at_put(i, h());
3728 }
3729
3730 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3731 JVM_END
3732
3733
3734 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3735 // Return StackTraceElement[][], each element is the stack trace of a thread in
3736 // the corresponding entry in the given threads array
3737 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3738 JvmtiVMObjectAllocEventCollector oam;
3739
3740 // Check if threads is null
3741 if (threads == nullptr) {
3742 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3743 }
3744
3745 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3746 objArrayHandle ah(THREAD, a);
3747 int num_threads = ah->length();
3748 // check if threads is non-empty array
3749 if (num_threads == 0) {
3750 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3751 }
3752
3753 // check if threads is not an array of objects of Thread class
3754 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3755 if (k != vmClasses::Thread_klass()) {
3756 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3757 }
3758 refArrayHandle rah(THREAD, (refArrayOop)ah()); // j.l.Thread is an identity class, arrays are always reference arrays
3759
3760 ResourceMark rm(THREAD);
3761
3762 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3763 for (int i = 0; i < num_threads; i++) {
3764 oop thread_obj = rah->obj_at(i);
3765 instanceHandle h(THREAD, (instanceOop) thread_obj);
3766 thread_handle_array->append(h);
3767 }
3768
3769 // The JavaThread references in thread_handle_array are validated
3770 // in VM_ThreadDump::doit().
3771 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3772 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3773
3774 JVM_END
3775
3776 // JVM monitoring and management support
3777 JVM_LEAF(void*, JVM_GetManagement(jint version))
3778 return Management::get_jmm_interface(version);
3779 JVM_END
3780
3781 // com.sun.tools.attach.VirtualMachine agent properties support
3782 //
3783 // Initialize the agent properties with the properties maintained in the VM
3784 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3785 ResourceMark rm;
3786
3787 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3788
3789 PUTPROP(props, "sun.java.command", Arguments::java_command());
3790 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3791 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3792 return properties;
3793 JVM_END
3794
3795 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3796 {
3797 JvmtiVMObjectAllocEventCollector oam;
3798
3799 if (ofClass == nullptr) {
3800 return nullptr;
3801 }
3802 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3803 // Special handling for primitive objects
3804 if (java_lang_Class::is_primitive(mirror())) {
3805 return nullptr;
3806 }
3807 Klass* k = java_lang_Class::as_Klass(mirror());
3808 if (!k->is_instance_klass()) {
3809 return nullptr;
3810 }
3811 InstanceKlass* ik = InstanceKlass::cast(k);
3812 int encl_method_class_idx = ik->enclosing_method_class_index();
3813 if (encl_method_class_idx == 0) {
3814 return nullptr;
3815 }
3816 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3817 objArrayHandle dest(THREAD, dest_o);
3818 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3819 dest->obj_at_put(0, enc_k->java_mirror());
3820 int encl_method_method_idx = ik->enclosing_method_method_index();
3821 if (encl_method_method_idx != 0) {
3822 Symbol* sym = ik->constants()->symbol_at(
3823 extract_low_short_from_int(
3824 ik->constants()->name_and_type_at(encl_method_method_idx)));
3825 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3826 dest->obj_at_put(1, str());
3827 sym = ik->constants()->symbol_at(
3828 extract_high_short_from_int(
3829 ik->constants()->name_and_type_at(encl_method_method_idx)));
3830 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3831 dest->obj_at_put(2, str());
3832 }
3833 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3834 }
3835 JVM_END
3836
3837 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3838 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3839 ResourceMark rm(THREAD);
3840
3841 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3842 return nullptr;
3843 }
3844
3845 char** vm_flags = Arguments::jvm_flags_array();
3846 char** vm_args = Arguments::jvm_args_array();
3847 int num_flags = Arguments::num_jvm_flags();
3848 int num_args = Arguments::num_jvm_args();
3849
3850 InstanceKlass* ik = vmClasses::String_klass();
3851 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3852 objArrayHandle result_h(THREAD, r);
3853
3854 int index = 0;
3855 for (int j = 0; j < num_flags; j++, index++) {
3856 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3857 result_h->obj_at_put(index, h());
3858 }
3859 for (int i = 0; i < num_args; i++, index++) {
3860 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3861 result_h->obj_at_put(index, h());
3862 }
3863 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3864 JVM_END
3865
3866 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3867 return os::get_signal_number(name);
3868 JVM_END
3869
3870 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3871 #if INCLUDE_JVMTI
3872 if (!DoJVMTIVirtualThreadTransitions) {
3873 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3874 return;
3875 }
3876 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3877 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3878 } else {
3879 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3880 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3881 }
3882 #endif
3883 JVM_END
3884
3885 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3886 #if INCLUDE_JVMTI
3887 if (!DoJVMTIVirtualThreadTransitions) {
3888 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3889 return;
3890 }
3891 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3892 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3893 } else {
3894 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3895 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3896 }
3897 #endif
3898 JVM_END
3899
3900 // If notifications are disabled then just update the VTMS transition bit and return.
3901 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3902 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3903 #if INCLUDE_JVMTI
3904 if (!DoJVMTIVirtualThreadTransitions) {
3905 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3906 return;
3907 }
3908 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3909 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3910 } else {
3911 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3912 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3913 }
3914 #endif
3915 JVM_END
3916
3917 // If notifications are disabled then just update the VTMS transition bit and return.
3918 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3919 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3920 #if INCLUDE_JVMTI
3921 if (!DoJVMTIVirtualThreadTransitions) {
3922 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3923 return;
3924 }
3925 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3926 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3927 } else {
3928 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3929 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3930 }
3931 #endif
3932 JVM_END
3933
3934 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3935 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3936 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3937 #if INCLUDE_JVMTI
3938 if (!DoJVMTIVirtualThreadTransitions) {
3939 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3940 return;
3941 }
3942 assert(thread->is_disable_suspend() != (bool)enter,
3943 "nested or unbalanced monitor enter/exit is not allowed");
3944 thread->toggle_is_disable_suspend();
3945 #endif
3946 JVM_END
3947
3948 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3949 #if INCLUDE_JFR
3950 freeze_result result = THREAD->last_freeze_fail_result();
3951 assert(result != freeze_ok, "sanity check");
3952 EventVirtualThreadPinned event(UNTIMED);
3953 event.set_starttime(THREAD->last_freeze_fail_time());
3954 if (event.should_commit()) {
3955 ResourceMark rm(THREAD);
3956 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3957 THREAD->post_vthread_pinned_event(&event, str, result);
3958 }
3959 #endif
3960 JVM_END
3961
3962 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3963 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3964 assert(parkEvent != nullptr, "not initialized");
3965
3966 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3967 oop vthread_head = nullptr;
3968 while (true) {
3969 if (list_head.peek() != nullptr) {
3970 for (;;) {
3971 oop head = list_head.resolve();
3972 if (list_head.cmpxchg(head, nullptr) == head) {
3973 return JNIHandles::make_local(THREAD, head);
3974 }
3975 }
3976 }
3977 ThreadBlockInVM tbivm(THREAD);
3978 parkEvent->park();
3979 }
3980 JVM_END
3981 /*
3982 * Return the current class's class file version. The low order 16 bits of the
3983 * returned jint contain the class's major version. The high order 16 bits
3984 * contain the class's minor version.
3985 */
3986 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3987 oop mirror = JNIHandles::resolve_non_null(current);
3988 if (java_lang_Class::is_primitive(mirror)) {
3989 // return latest major version and minor version of 0.
3990 return JVM_CLASSFILE_MAJOR_VERSION;
3991 }
3992 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3993 return (ik->minor_version() << 16) | ik->major_version();
3994 JVM_END
3995
3996 /*
3997 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3998 * get the value will see a materialized value and not a scalar-replaced
3999 * null value.
4000 */
4001 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4002 JVM_EnsureMaterializedForStackWalk(env, value);
4003 JVM_END
4004
4005 /*
4006 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4007 */
4008 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4009 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4010 JVM_END