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::array_properties_from_layout(lk);
449 array = oopFactory::new_flatArray(vk, len, props, lk, CHECK_NULL);
450 arrayHandle ah(THREAD, (arrayOop)array);
451 int end = to < oh()->length() ? to : oh()->length();
452 for (int i = from; i < end; i++) {
453 void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper());
454 void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper());
455 vk->copy_payload_to_addr(src, dst, lk, false);
456 }
457 array = ah();
458 } else {
459 ArrayKlass::ArrayProperties props = org->is_null_free_array() ? ArrayKlass::ArrayProperties::NULL_RESTRICTED : ArrayKlass::ArrayProperties::DEFAULT;
460 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL);
461 int end = to < oh()->length() ? to : oh()->length();
462 for (int i = from; i < end; i++) {
463 if (i < ((objArrayOop)oh())->length()) {
464 ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i));
465 } else {
466 assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
467 ((objArrayOop)array)->obj_at_put(i - from, nullptr);
468 }
469 }
470 }
471 return (jarray) JNIHandles::make_local(THREAD, array);
472 JVM_END
473
474 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
475 oop mirror = JNIHandles::resolve_non_null(elmClass);
476 oop init = JNIHandles::resolve(initVal);
477 if (init == nullptr) {
478 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
479 }
480 Handle init_h(THREAD, init);
481 Klass* klass = java_lang_Class::as_Klass(mirror);
482 if (klass != init_h()->klass()) {
483 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
484 }
485 validate_array_arguments(klass, len, CHECK_NULL);
486 InlineKlass* vk = InlineKlass::cast(klass);
487 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NON_ATOMIC | ArrayKlass::ArrayProperties::NULL_RESTRICTED);
488 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
489 for (int i = 0; i < len; i++) {
490 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
491 }
492 return (jarray) JNIHandles::make_local(THREAD, array);
493 JVM_END
494
495 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
496 oop mirror = JNIHandles::resolve_non_null(elmClass);
497 oop init = JNIHandles::resolve(initVal);
498 if (init == nullptr) {
499 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
500 }
501 Handle init_h(THREAD, init);
502 Klass* klass = java_lang_Class::as_Klass(mirror);
503 if (klass != init_h()->klass()) {
504 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
505 }
506 validate_array_arguments(klass, len, CHECK_NULL);
507 InlineKlass* vk = InlineKlass::cast(klass);
508 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED);
509 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
510 for (int i = 0; i < len; i++) {
511 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
512 }
513 return (jarray) JNIHandles::make_local(THREAD, array);
514 JVM_END
515
516 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
517 oop mirror = JNIHandles::resolve_non_null(elmClass);
518 Klass* klass = java_lang_Class::as_Klass(mirror);
519 klass->initialize(CHECK_NULL);
520 validate_array_arguments(klass, len, CHECK_NULL);
521 InlineKlass* vk = InlineKlass::cast(klass);
522 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::DEFAULT);
523 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
524 return (jarray) JNIHandles::make_local(THREAD, array);
525 JVM_END
526
527 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
528 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
529 return oop->is_flatArray();
530 JVM_END
531
532 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
533 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
534 return oop->is_null_free_array();
535 JVM_END
536
537 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
538 // There are multiple cases where an array can/must support atomic access:
539 // - the array is a reference array
540 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or ATOMIC_FLAT
541 // - the array is flat and its component type is naturally atomic
542 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
543 if (oop->is_refArray()) return true;
544 if (oop->is_flatArray()) {
545 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
546 if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) return true;
547 if (fak->element_klass()->is_naturally_atomic()) return true;
548 }
549 return false;
550 JVM_END
551
552 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
553
554 extern volatile jint vm_created;
555
556 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
557 EventShutdown event;
558 if (event.should_commit()) {
559 event.set_reason("Shutdown requested from Java");
560 event.commit();
561 }
562 JVM_END
563
564
565 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
566 before_exit(thread, true);
567 vm_exit(code);
568 JVM_END
569
570
571 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
572 if (!DisableExplicitGC) {
573 EventSystemGC event;
574 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
575 Universe::heap()->collect(GCCause::_java_lang_system_gc);
576 event.commit();
577 }
578 JVM_END
579
580
581 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
582 return Universe::heap()->millis_since_last_whole_heap_examined();
583 JVM_END
584
585
586 static inline jlong convert_size_t_to_jlong(size_t val) {
587 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
588 NOT_LP64 (return (jlong)val;)
589 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
590 }
591
592 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
593 size_t n = Universe::heap()->capacity();
594 return convert_size_t_to_jlong(n);
595 JVM_END
596
597
598 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
599 size_t n = Universe::heap()->unused();
600 return convert_size_t_to_jlong(n);
601 JVM_END
602
603
604 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
605 size_t n = Universe::heap()->max_capacity();
606 return convert_size_t_to_jlong(n);
607 JVM_END
608
609
610 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
611 return os::active_processor_count();
612 JVM_END
613
614 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
615 #ifdef LINUX
616 if (UseContainerSupport) {
617 return JNI_TRUE;
618 }
619 #endif
620 return JNI_FALSE;
621 JVM_END
622
623 JVM_LEAF(jboolean, JVM_IsContainerized(void))
624 #ifdef LINUX
625 if (OSContainer::is_containerized()) {
626 return JNI_TRUE;
627 }
628 #endif
629 return JNI_FALSE;
630 JVM_END
631
632 // java.lang.Throwable //////////////////////////////////////////////////////
633
634 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
635 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
636 java_lang_Throwable::fill_in_stack_trace(exception);
637 JVM_END
638
639 // java.lang.NullPointerException ///////////////////////////////////////////
640
641 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
642 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
643
644 oop exc = JNIHandles::resolve_non_null(throwable);
645
646 Method* method;
647 int bci;
648 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
649 return nullptr;
650 }
651 if (method->is_native()) {
652 return nullptr;
653 }
654
655 stringStream ss;
656 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
657 if (ok) {
658 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
659 return (jstring) JNIHandles::make_local(THREAD, result);
660 } else {
661 return nullptr;
662 }
663 JVM_END
664
665 // java.lang.StackTraceElement //////////////////////////////////////////////
666
667
668 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
669 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
670 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
671 objArrayHandle stack_trace(THREAD, st);
672 // Fill in the allocated stack trace
673 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
674 JVM_END
675
676
677 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
678 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
679 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
680 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
681 JVM_END
682
683
684 // java.lang.StackWalker //////////////////////////////////////////////////////
685 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
686 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
687
688 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
689 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
690 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
691 if (!have_name) {
692 oop name = StringTable::intern(method->name(), CHECK);
693 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
694 }
695 if (!have_type) {
696 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
697 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
698 }
699 JVM_END
700
701 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
702 jint skip_frames, jobject contScope, jobject cont,
703 jint buffer_size, jint start_index, jobjectArray frames))
704 if (!thread->has_last_Java_frame()) {
705 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
706 }
707
708 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
709 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
710 Handle cont_h(THREAD, JNIHandles::resolve(cont));
711 // frames array is a ClassFrameInfo[] array when only getting caller reference,
712 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
713 // be null.
714 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
715 objArrayHandle frames_array_h(THREAD, fa);
716
717 if (frames_array_h->length() < buffer_size) {
718 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
719 }
720
721 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
722 buffer_size, start_index, frames_array_h, CHECK_NULL);
723 return JNIHandles::make_local(THREAD, result);
724 JVM_END
725
726
727 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
728 jint last_batch_count, jint buffer_size, jint start_index,
729 jobjectArray frames))
730 // frames array is a ClassFrameInfo[] array when only getting caller reference,
731 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
732 // be null.
733 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
734 objArrayHandle frames_array_h(THREAD, fa);
735
736 if (frames_array_h->length() < buffer_size) {
737 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
738 }
739
740 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
741 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
742 start_index, frames_array_h, THREAD);
743 JVM_END
744
745 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
746 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
747 objArrayHandle frames_array_h(THREAD, fa);
748 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
749 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
750
751 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
752 JVM_END
753
754 // java.lang.Object ///////////////////////////////////////////////
755
756
757 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
758 // as implemented in the classic virtual machine; return 0 if object is null
759 if (handle == nullptr) {
760 return 0;
761 }
762 oop obj = JNIHandles::resolve_non_null(handle);
763 if (EnableValhalla && obj->klass()->is_inline_klass()) {
764 JavaValue result(T_INT);
765 JavaCallArguments args;
766 Handle ho(THREAD, obj);
767 args.push_oop(ho);
768 methodHandle method(THREAD, UseAltSubstitutabilityMethod
769 ? Universe::value_object_hash_codeAlt_method() : Universe::value_object_hash_code_method());
770 JavaCalls::call(&result, method, &args, THREAD);
771 if (HAS_PENDING_EXCEPTION) {
772 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
773 Handle e(THREAD, PENDING_EXCEPTION);
774 CLEAR_PENDING_EXCEPTION;
775 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
776 }
777 }
778 return result.get_jint();
779 } else {
780 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
781 }
782 JVM_END
783
784
785 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
786 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
787 ObjectSynchronizer::wait(obj, ms, CHECK);
788 JVM_END
789
790
791 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
792 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
793 ObjectSynchronizer::notify(obj, CHECK);
794 JVM_END
795
796
797 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
798 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
799 ObjectSynchronizer::notifyall(obj, CHECK);
800 JVM_END
801
802
803 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
804 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
805 Klass* klass = obj->klass();
806 JvmtiVMObjectAllocEventCollector oam;
807
808 #ifdef ASSERT
809 // Just checking that the cloneable flag is set correct
810 if (obj->is_array()) {
811 guarantee(klass->is_cloneable(), "all arrays are cloneable");
812 } else {
813 guarantee(obj->is_instance(), "should be instanceOop");
814 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
815 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
816 }
817 #endif
818
819 // Check if class of obj supports the Cloneable interface.
820 // All arrays are considered to be cloneable (See JLS 20.1.5).
821 // All j.l.r.Reference classes are considered non-cloneable.
822 if (!klass->is_cloneable() ||
823 (klass->is_instance_klass() &&
824 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
825 ResourceMark rm(THREAD);
826 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
827 }
828
829 if (klass->is_inline_klass()) {
830 // Value instances have no identity, so return the current instance instead of allocating a new one
831 // Value classes cannot have finalizers, so the method can return immediately
832 return JNIHandles::make_local(THREAD, obj());
833 }
834
835 // Make shallow object copy
836 const size_t size = obj->size();
837 oop new_obj_oop = nullptr;
838 if (obj->is_array()) {
839 const int length = ((arrayOop)obj())->length();
840 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
841 /* do_zero */ true, CHECK_NULL);
842 } else {
843 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
844 }
845
846 HeapAccess<>::clone(obj(), new_obj_oop, size);
847
848 Handle new_obj(THREAD, new_obj_oop);
849 // Caution: this involves a java upcall, so the clone should be
850 // "gc-robust" by this stage.
851 if (klass->has_finalizer()) {
852 assert(obj->is_instance(), "should be instanceOop");
853 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
854 new_obj = Handle(THREAD, new_obj_oop);
855 }
856
857 return JNIHandles::make_local(THREAD, new_obj());
858 JVM_END
859
860 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
861
862 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
863 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
864 JVM_END
865
866 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
867 return InstanceKlass::is_finalization_enabled();
868 JVM_END
869
870 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
871
872 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
873 CONT_RegisterNativeMethods(env, cls);
874 JVM_END
875
876 // java.io.File ///////////////////////////////////////////////////////////////
877
878 JVM_LEAF(char*, JVM_NativePath(char* path))
879 return os::native_path(path);
880 JVM_END
881
882
883 // Misc. class handling ///////////////////////////////////////////////////////////
884
885
886 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
887 // Getting the class of the caller frame.
888 //
889 // The call stack at this point looks something like this:
890 //
891 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
892 // [1] [ @CallerSensitive API.method ]
893 // [.] [ (skipped intermediate frames) ]
894 // [n] [ caller ]
895 vframeStream vfst(thread);
896 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
897 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
898 Method* m = vfst.method();
899 assert(m != nullptr, "sanity");
900 switch (n) {
901 case 0:
902 // This must only be called from Reflection.getCallerClass
903 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
904 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
905 }
906 // fall-through
907 case 1:
908 // Frame 0 and 1 must be caller sensitive.
909 if (!m->caller_sensitive()) {
910 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
911 }
912 break;
913 default:
914 if (!m->is_ignored_by_security_stack_walk()) {
915 // We have reached the desired frame; return the holder class.
916 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
917 }
918 break;
919 }
920 }
921 return nullptr;
922 JVM_END
923
924
925 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
926 oop mirror = nullptr;
927 BasicType t = name2type(utf);
928 if (t != T_ILLEGAL && !is_reference_type(t)) {
929 mirror = Universe::java_mirror(t);
930 }
931 if (mirror == nullptr) {
932 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
933 } else {
934 return (jclass) JNIHandles::make_local(THREAD, mirror);
935 }
936 JVM_END
937
938
939 // Returns a class loaded by the bootstrap class loader; or null
940 // if not found. ClassNotFoundException is not thrown.
941 // FindClassFromBootLoader is exported to the launcher for windows.
942 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
943 const char* name))
944 // Java libraries should ensure that name is never null or illegal.
945 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
946 // It's impossible to create this class; the name cannot fit
947 // into the constant pool.
948 return nullptr;
949 }
950 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
951
952 TempNewSymbol h_name = SymbolTable::new_symbol(name);
953 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
954 if (k == nullptr) {
955 return nullptr;
956 }
957
958 if (log_is_enabled(Debug, class, resolve)) {
959 trace_class_resolution(k);
960 }
961 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
962 JVM_END
963
964 // Find a class with this name in this loader.
965 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
966 jboolean init, jobject loader))
967 TempNewSymbol h_name =
968 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
969 CHECK_NULL);
970
971 oop loader_oop = JNIHandles::resolve(loader);
972 Handle h_loader(THREAD, loader_oop);
973
974 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
975 false, THREAD);
976
977 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
978 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
979 }
980 return result;
981 JVM_END
982
983 // Currently only called from the old verifier.
984 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
985 jboolean init, jclass from))
986 TempNewSymbol h_name =
987 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
988 CHECK_NULL);
989 oop from_class_oop = JNIHandles::resolve(from);
990 assert(from_class_oop != nullptr, "must be");
991 Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
992 assert(from_class != nullptr, "must be");
993 oop class_loader = from_class->class_loader();
994
995 Handle h_loader(THREAD, class_loader);
996 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
997
998 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
999 // this function is generally only used for class loading during verification.
1000 ResourceMark rm;
1001 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1002 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1003 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1004 }
1005
1006 #if INCLUDE_CDS
1007 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1008 InstanceKlass* ik = InstanceKlass::cast(from_class);
1009 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1010 }
1011 #endif
1012
1013 return result;
1014 JVM_END
1015
1016 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1017 static jclass jvm_define_class_common(const char *name,
1018 jobject loader, const jbyte *buf,
1019 jsize len, jobject pd, const char *source,
1020 TRAPS) {
1021 if (source == nullptr) source = "__JVM_DefineClass__";
1022
1023 JavaThread* jt = THREAD;
1024
1025 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1026 ClassLoader::perf_define_appclass_selftime(),
1027 ClassLoader::perf_define_appclasses(),
1028 jt->get_thread_stat()->perf_recursion_counts_addr(),
1029 jt->get_thread_stat()->perf_timers_addr(),
1030 PerfClassTraceTime::DEFINE_CLASS);
1031
1032 if (UsePerfData) {
1033 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1034 }
1035
1036 // Class resolution will get the class name from the .class stream if the name is null.
1037 TempNewSymbol class_name = name == nullptr ? nullptr :
1038 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1039 CHECK_NULL);
1040
1041 ResourceMark rm(THREAD);
1042 ClassFileStream st((u1*)buf, len, source);
1043 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1044 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1045 ClassLoadInfo cl_info(protection_domain);
1046 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1047 class_loader,
1048 cl_info,
1049 CHECK_NULL);
1050
1051 if (log_is_enabled(Debug, class, resolve)) {
1052 trace_class_resolution(k);
1053 }
1054
1055 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1056 }
1057
1058 enum {
1059 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1060 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1061 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1062 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1063 };
1064
1065 /*
1066 * Define a class with the specified flags that indicates if it's a nestmate,
1067 * hidden, or strongly referenced from class loader.
1068 */
1069 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1070 const jbyte *buf, jsize len, jobject pd,
1071 jboolean init, int flags, jobject classData, TRAPS) {
1072 ResourceMark rm(THREAD);
1073
1074 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1075 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1076 if (lookup_k == nullptr) {
1077 // The error message is wrong. We come here only if lookup is a primitive class
1078 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1079 }
1080
1081 Handle class_loader (THREAD, lookup_k->class_loader());
1082
1083 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1084 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1085 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1086 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1087
1088 InstanceKlass* host_class = nullptr;
1089 if (is_nestmate) {
1090 host_class = lookup_k->nest_host(CHECK_NULL);
1091 }
1092
1093 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1094 name,
1095 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1096 is_nestmate ? host_class->external_name() : "",
1097 is_hidden ? "hidden" : "not hidden",
1098 is_strong ? "strong" : "weak",
1099 vm_annotations ? "with vm annotations" : "without vm annotation");
1100
1101 if (!is_hidden) {
1102 // classData is only applicable for hidden classes
1103 if (classData != nullptr) {
1104 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1105 }
1106 if (is_nestmate) {
1107 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1108 }
1109 if (!is_strong) {
1110 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1111 }
1112 if (vm_annotations) {
1113 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1114 }
1115 if (flags != STRONG_LOADER_LINK) {
1116 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1117 err_msg("invalid flag 0x%x", flags));
1118 }
1119 }
1120
1121 // Class resolution will get the class name from the .class stream if the name is null.
1122 TempNewSymbol class_name = name == nullptr ? nullptr :
1123 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1124 CHECK_NULL);
1125
1126 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1127 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1128 ClassFileStream st((u1*)buf, len, source);
1129
1130 InstanceKlass* ik = nullptr;
1131 if (!is_hidden) {
1132 ClassLoadInfo cl_info(protection_domain);
1133 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1134 class_loader,
1135 cl_info,
1136 CHECK_NULL);
1137
1138 if (log_is_enabled(Debug, class, resolve)) {
1139 trace_class_resolution(ik);
1140 }
1141 } else { // hidden
1142 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1143 ClassLoadInfo cl_info(protection_domain,
1144 host_class,
1145 classData_h,
1146 is_hidden,
1147 is_strong,
1148 vm_annotations);
1149 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1150 class_loader,
1151 cl_info,
1152 CHECK_NULL);
1153
1154 // The hidden class loader data has been artificially been kept alive to
1155 // this point. The mirror and any instances of this class have to keep
1156 // it alive afterwards.
1157 ik->class_loader_data()->dec_keep_alive_ref_count();
1158
1159 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1160 ModuleEntry* module = ik->module();
1161 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1162 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1163 module_name,
1164 ik->external_name(),
1165 host_class->external_name(),
1166 ik->is_hidden() ? "is hidden" : "is not hidden");
1167 }
1168 }
1169
1170 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1171 // non-hidden class or nestmate class must be in the same package as the Lookup class
1172 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1173 }
1174
1175 if (init) {
1176 ik->initialize(CHECK_NULL);
1177 } else {
1178 ik->link_class(CHECK_NULL);
1179 }
1180
1181 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1182 }
1183
1184 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1185 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1186 JVM_END
1187
1188 /*
1189 * Define a class with the specified lookup class.
1190 * lookup: Lookup class
1191 * name: the name of the class
1192 * buf: class bytes
1193 * len: length of class bytes
1194 * pd: protection domain
1195 * init: initialize the class
1196 * flags: properties of the class
1197 * classData: private static pre-initialized field
1198 */
1199 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1200 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1201
1202 if (lookup == nullptr) {
1203 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1204 }
1205
1206 assert(buf != nullptr, "buf must not be null");
1207
1208 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1209 JVM_END
1210
1211 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1212
1213 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1214 JVM_END
1215
1216 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1217 ResourceMark rm(THREAD);
1218
1219 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1220 char* str = java_lang_String::as_utf8_string(h_name());
1221
1222 // Sanity check, don't expect null
1223 if (str == nullptr) return nullptr;
1224
1225 // Internalize the string, converting '.' to '/' in string.
1226 char* p = (char*)str;
1227 while (*p != '\0') {
1228 if (*p == '.') {
1229 *p = '/';
1230 }
1231 p++;
1232 }
1233
1234 const int str_len = (int)(p - str);
1235 if (str_len > Symbol::max_length()) {
1236 // It's impossible to create this class; the name cannot fit
1237 // into the constant pool.
1238 return nullptr;
1239 }
1240 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1241
1242 // Security Note:
1243 // The Java level wrapper will perform the necessary security check allowing
1244 // us to pass the null as the initiating class loader.
1245 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1246 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1247 #if INCLUDE_CDS
1248 if (k == nullptr) {
1249 // If the class is not already loaded, try to see if it's in the shared
1250 // archive for the current classloader (h_loader).
1251 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1252 }
1253 #endif
1254 return (k == nullptr) ? nullptr :
1255 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1256 JVM_END
1257
1258 // Module support //////////////////////////////////////////////////////////////////////////////
1259
1260 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1261 jstring location, jobjectArray packages))
1262 Handle h_module (THREAD, JNIHandles::resolve(module));
1263 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1264 JVM_END
1265
1266 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1267 Handle h_module (THREAD, JNIHandles::resolve(module));
1268 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1269 JVM_END
1270
1271 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1272 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1273 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1274 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1275 JVM_END
1276
1277 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1278 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1279 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1280 JVM_END
1281
1282 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1283 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1284 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1285 JVM_END
1286
1287 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1288 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1289 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1290 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1291 JVM_END
1292
1293 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1294 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1295 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1296 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1297 JVM_END
1298
1299 // Reflection support //////////////////////////////////////////////////////////////////////////////
1300
1301 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1302 assert (cls != nullptr, "illegal class");
1303 JvmtiVMObjectAllocEventCollector oam;
1304 ResourceMark rm(THREAD);
1305 HandleMark hm(THREAD);
1306 Handle java_class(THREAD, JNIHandles::resolve(cls));
1307 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1308 return (jstring) JNIHandles::make_local(THREAD, result);
1309 JVM_END
1310
1311
1312 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1313 JvmtiVMObjectAllocEventCollector oam;
1314 oop mirror = JNIHandles::resolve_non_null(cls);
1315
1316 // Special handling for primitive objects
1317 if (java_lang_Class::is_primitive(mirror)) {
1318 // Primitive objects does not have any interfaces
1319 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1320 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1321 }
1322
1323 Klass* klass = java_lang_Class::as_Klass(mirror);
1324 // Figure size of result array
1325 int size;
1326 if (klass->is_instance_klass()) {
1327 InstanceKlass* ik = InstanceKlass::cast(klass);
1328 size = ik->local_interfaces()->length();
1329 } else {
1330 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1331 size = 2;
1332 }
1333
1334 // Allocate result array
1335 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1336 objArrayHandle result (THREAD, r);
1337 // Fill in result
1338 if (klass->is_instance_klass()) {
1339 // Regular instance klass, fill in all local interfaces
1340 for (int index = 0; index < size; index++) {
1341 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1342 result->obj_at_put(index, k->java_mirror());
1343 }
1344 } else {
1345 // All arrays implement java.lang.Cloneable and java.io.Serializable
1346 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1347 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1348 }
1349 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1350 JVM_END
1351
1352
1353 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1354 oop mirror = JNIHandles::resolve_non_null(cls);
1355 if (java_lang_Class::is_primitive(mirror)) {
1356 return JNI_FALSE;
1357 }
1358 Klass* k = java_lang_Class::as_Klass(mirror);
1359 return k->is_hidden();
1360 JVM_END
1361
1362 class ScopedValueBindingsResolver {
1363 public:
1364 InstanceKlass* Carrier_klass;
1365 ScopedValueBindingsResolver(JavaThread* THREAD) {
1366 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1367 Carrier_klass = InstanceKlass::cast(k);
1368 }
1369 };
1370
1371 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1372 ResourceMark rm(THREAD);
1373 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1374 JvmtiVMObjectAllocEventCollector oam;
1375
1376 static ScopedValueBindingsResolver resolver(THREAD);
1377
1378 // Iterate through Java frames
1379 vframeStream vfst(thread);
1380 for(; !vfst.at_end(); vfst.next()) {
1381 int loc = -1;
1382 // get method of frame
1383 Method* method = vfst.method();
1384
1385 Symbol *name = method->name();
1386
1387 InstanceKlass* holder = method->method_holder();
1388 if (name == vmSymbols::runWith_method_name()) {
1389 if (holder == vmClasses::Thread_klass()
1390 || holder == resolver.Carrier_klass) {
1391 loc = 1;
1392 }
1393 }
1394
1395 if (loc != -1) {
1396 javaVFrame *frame = vfst.asJavaVFrame();
1397 StackValueCollection* locals = frame->locals();
1398 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1399 Handle result = head_sv->get_obj();
1400 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1401 if (result() != nullptr) {
1402 return JNIHandles::make_local(THREAD, result());
1403 }
1404 }
1405 }
1406
1407 return nullptr;
1408 JVM_END
1409
1410 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1411 JvmtiVMObjectAllocEventCollector oam;
1412 // ofClass is a reference to a java_lang_Class object. The mirror object
1413 // of an InstanceKlass
1414 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1415 if (java_lang_Class::is_primitive(ofMirror) ||
1416 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1417 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1418 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1419 }
1420
1421 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1422 InnerClassesIterator iter(k);
1423
1424 if (iter.length() == 0) {
1425 // Neither an inner nor outer class
1426 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1427 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1428 }
1429
1430 // find inner class info
1431 constantPoolHandle cp(thread, k->constants());
1432 int length = iter.length();
1433
1434 // Allocate temp. result array
1435 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1436 objArrayHandle result (THREAD, r);
1437 int members = 0;
1438
1439 for (; !iter.done(); iter.next()) {
1440 int ioff = iter.inner_class_info_index();
1441 int ooff = iter.outer_class_info_index();
1442
1443 if (ioff != 0 && ooff != 0) {
1444 // Check to see if the name matches the class we're looking for
1445 // before attempting to find the class.
1446 if (cp->klass_name_at_matches(k, ooff)) {
1447 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1448 if (outer_klass == k) {
1449 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1450 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1451
1452 // Throws an exception if outer klass has not declared k as
1453 // an inner klass
1454 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1455
1456 result->obj_at_put(members, inner_klass->java_mirror());
1457 members++;
1458 }
1459 }
1460 }
1461 }
1462
1463 if (members != length) {
1464 // Return array of right length
1465 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1466 for(int i = 0; i < members; i++) {
1467 res->obj_at_put(i, result->obj_at(i));
1468 }
1469 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1470 }
1471
1472 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1473 JVM_END
1474
1475
1476 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1477 {
1478 // ofClass is a reference to a java_lang_Class object.
1479 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1480 if (java_lang_Class::is_primitive(ofMirror)) {
1481 return nullptr;
1482 }
1483 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1484 if (!klass->is_instance_klass()) {
1485 return nullptr;
1486 }
1487
1488 bool inner_is_member = false;
1489 Klass* outer_klass
1490 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1491 if (outer_klass == nullptr) return nullptr; // already a top-level class
1492 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1493 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1494 }
1495 JVM_END
1496
1497 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1498 {
1499 oop mirror = JNIHandles::resolve_non_null(cls);
1500 if (java_lang_Class::is_primitive(mirror)) {
1501 return nullptr;
1502 }
1503 Klass* klass = java_lang_Class::as_Klass(mirror);
1504 if (!klass->is_instance_klass()) {
1505 return nullptr;
1506 }
1507 InstanceKlass* k = InstanceKlass::cast(klass);
1508 int ooff = 0, noff = 0;
1509 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1510 if (noff != 0) {
1511 constantPoolHandle i_cp(thread, k->constants());
1512 Symbol* name = i_cp->symbol_at(noff);
1513 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1514 return (jstring) JNIHandles::make_local(THREAD, str());
1515 }
1516 }
1517 return nullptr;
1518 }
1519 JVM_END
1520
1521 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1522 assert (cls != nullptr, "illegal class");
1523 JvmtiVMObjectAllocEventCollector oam;
1524 ResourceMark rm(THREAD);
1525 oop mirror = JNIHandles::resolve_non_null(cls);
1526 // Return null for arrays and primitives
1527 if (!java_lang_Class::is_primitive(mirror)) {
1528 Klass* k = java_lang_Class::as_Klass(mirror);
1529 if (k->is_instance_klass()) {
1530 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1531 if (sym == nullptr) return nullptr;
1532 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1533 return (jstring) JNIHandles::make_local(THREAD, str());
1534 }
1535 }
1536 return nullptr;
1537 JVM_END
1538
1539
1540 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1541 assert (cls != nullptr, "illegal class");
1542 oop mirror = JNIHandles::resolve_non_null(cls);
1543 // Return null for arrays and primitives
1544 if (!java_lang_Class::is_primitive(mirror)) {
1545 Klass* k = java_lang_Class::as_Klass(mirror);
1546 if (k->is_instance_klass()) {
1547 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1548 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1549 }
1550 }
1551 return nullptr;
1552 JVM_END
1553
1554
1555 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1556 // some of this code was adapted from from jni_FromReflectedField
1557
1558 oop reflected = JNIHandles::resolve_non_null(field);
1559 oop mirror = java_lang_reflect_Field::clazz(reflected);
1560 int slot = java_lang_reflect_Field::slot(reflected);
1561 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1562
1563 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1564 int offset = ik->field_offset(slot);
1565
1566 if (modifiers & JVM_ACC_STATIC) {
1567 // for static fields we only look in the current class
1568 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1569 assert(false, "cannot find static field");
1570 return false;
1571 }
1572 } else {
1573 // for instance fields we start with the current class and work
1574 // our way up through the superclass chain
1575 if (!ik->find_field_from_offset(offset, false, &fd)) {
1576 assert(false, "cannot find instance field");
1577 return false;
1578 }
1579 }
1580 return true;
1581 }
1582
1583 static Method* jvm_get_method_common(jobject method) {
1584 // some of this code was adapted from from jni_FromReflectedMethod
1585
1586 oop reflected = JNIHandles::resolve_non_null(method);
1587 oop mirror = nullptr;
1588 int slot = 0;
1589
1590 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1591 mirror = java_lang_reflect_Constructor::clazz(reflected);
1592 slot = java_lang_reflect_Constructor::slot(reflected);
1593 } else {
1594 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1595 "wrong type");
1596 mirror = java_lang_reflect_Method::clazz(reflected);
1597 slot = java_lang_reflect_Method::slot(reflected);
1598 }
1599 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1600
1601 Method* m = ik->method_with_idnum(slot);
1602 assert(m != nullptr, "cannot find method");
1603 return m; // caller has to deal with null in product mode
1604 }
1605
1606 /* Type use annotations support (JDK 1.8) */
1607
1608 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1609 assert (cls != nullptr, "illegal class");
1610 ResourceMark rm(THREAD);
1611 // Return null for arrays and primitives
1612 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1613 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1614 if (k->is_instance_klass()) {
1615 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1616 if (type_annotations != nullptr) {
1617 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1618 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1619 }
1620 }
1621 }
1622 return nullptr;
1623 JVM_END
1624
1625 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1626 assert (method != nullptr, "illegal method");
1627 // method is a handle to a java.lang.reflect.Method object
1628 Method* m = jvm_get_method_common(method);
1629 if (m == nullptr) {
1630 return nullptr;
1631 }
1632
1633 AnnotationArray* type_annotations = m->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 return nullptr;
1640 JVM_END
1641
1642 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1643 assert (field != nullptr, "illegal field");
1644 fieldDescriptor fd;
1645 bool gotFd = jvm_get_field_common(field, fd);
1646 if (!gotFd) {
1647 return nullptr;
1648 }
1649
1650 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1651 JVM_END
1652
1653 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1654 if (!cp->is_within_bounds(index)) {
1655 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1656 }
1657 }
1658
1659 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1660 {
1661 // method is a handle to a java.lang.reflect.Method object
1662 Method* method_ptr = jvm_get_method_common(method);
1663 methodHandle mh (THREAD, method_ptr);
1664 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1665 const int num_params = mh->method_parameters_length();
1666
1667 if (num_params < 0) {
1668 // A -1 return value from method_parameters_length means there is no
1669 // parameter data. Return null to indicate this to the reflection
1670 // API.
1671 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1672 return (jobjectArray)nullptr;
1673 } else {
1674 // Otherwise, we return something up to reflection, even if it is
1675 // a zero-length array. Why? Because in some cases this can
1676 // trigger a MalformedParametersException.
1677
1678 // make sure all the symbols are properly formatted
1679 for (int i = 0; i < num_params; i++) {
1680 MethodParametersElement* params = mh->method_parameters_start();
1681 int index = params[i].name_cp_index;
1682 constantPoolHandle cp(THREAD, mh->constants());
1683 bounds_check(cp, index, CHECK_NULL);
1684
1685 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1686 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1687 "Wrong type at constant pool index");
1688 }
1689
1690 }
1691
1692 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1693 objArrayHandle result (THREAD, result_oop);
1694
1695 for (int i = 0; i < num_params; i++) {
1696 MethodParametersElement* params = mh->method_parameters_start();
1697 // For a 0 index, give a null symbol
1698 Symbol* sym = 0 != params[i].name_cp_index ?
1699 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1700 int flags = params[i].flags;
1701 oop param = Reflection::new_parameter(reflected_method, i, sym,
1702 flags, CHECK_NULL);
1703 result->obj_at_put(i, param);
1704 }
1705 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1706 }
1707 }
1708 JVM_END
1709
1710 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1711
1712 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1713 {
1714 JvmtiVMObjectAllocEventCollector oam;
1715
1716 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1717 // Exclude primitive types and array types
1718 if (java_lang_Class::is_primitive(ofMirror) ||
1719 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1720 // Return empty array
1721 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1722 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1723 }
1724
1725 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1726 constantPoolHandle cp(THREAD, k->constants());
1727
1728 // Ensure class is linked
1729 k->link_class(CHECK_NULL);
1730
1731 // Allocate result
1732 int num_fields;
1733
1734 if (publicOnly) {
1735 num_fields = 0;
1736 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1737 if (fs.access_flags().is_public()) ++num_fields;
1738 }
1739 } else {
1740 num_fields = k->java_fields_count();
1741 }
1742
1743 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1744 objArrayHandle result (THREAD, r);
1745
1746 int out_idx = 0;
1747 fieldDescriptor fd;
1748 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1749 if (!publicOnly || fs.access_flags().is_public()) {
1750 fd.reinitialize(k, fs.to_FieldInfo());
1751 oop field = Reflection::new_field(&fd, CHECK_NULL);
1752 result->obj_at_put(out_idx, field);
1753 ++out_idx;
1754 }
1755 }
1756 assert(out_idx == num_fields, "just checking");
1757 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1758 }
1759 JVM_END
1760
1761 // A class is a record if and only if it is final and a direct subclass of
1762 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1763 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1764 {
1765 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1766 if (k != nullptr && k->is_instance_klass()) {
1767 InstanceKlass* ik = InstanceKlass::cast(k);
1768 return ik->is_record();
1769 } else {
1770 return false;
1771 }
1772 }
1773 JVM_END
1774
1775 // Returns an array containing the components of the Record attribute,
1776 // or null if the attribute is not present.
1777 //
1778 // Note that this function returns the components of the Record attribute
1779 // even if the class is not a record.
1780 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1781 {
1782 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1783
1784 Array<RecordComponent*>* components = ik->record_components();
1785 if (components != nullptr) {
1786 JvmtiVMObjectAllocEventCollector oam;
1787 constantPoolHandle cp(THREAD, ik->constants());
1788 int length = components->length();
1789 assert(length >= 0, "unexpected record_components length");
1790 objArrayOop record_components =
1791 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1792 objArrayHandle components_h (THREAD, record_components);
1793
1794 for (int x = 0; x < length; x++) {
1795 RecordComponent* component = components->at(x);
1796 assert(component != nullptr, "unexpected null record component");
1797 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1798 components_h->obj_at_put(x, component_oop);
1799 }
1800 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1801 }
1802
1803 return nullptr;
1804 }
1805 JVM_END
1806
1807 static jobjectArray get_class_declared_methods_helper(
1808 JNIEnv *env,
1809 jclass ofClass, jboolean publicOnly,
1810 bool want_constructor,
1811 Klass* klass, TRAPS) {
1812
1813 JvmtiVMObjectAllocEventCollector oam;
1814
1815 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1816 // Exclude primitive types and array types
1817 if (java_lang_Class::is_primitive(ofMirror)
1818 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1819 // Return empty array
1820 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1821 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1822 }
1823
1824 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1825
1826 // Ensure class is linked
1827 k->link_class(CHECK_NULL);
1828
1829 Array<Method*>* methods = k->methods();
1830 int methods_length = methods->length();
1831
1832 // Save original method_idnum in case of redefinition, which can change
1833 // the idnum of obsolete methods. The new method will have the same idnum
1834 // but if we refresh the methods array, the counts will be wrong.
1835 ResourceMark rm(THREAD);
1836 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1837 int num_methods = 0;
1838
1839 // Select methods matching the criteria.
1840 for (int i = 0; i < methods_length; i++) {
1841 Method* method = methods->at(i);
1842 if (want_constructor && !method->is_object_constructor()) {
1843 continue;
1844 }
1845 if (!want_constructor &&
1846 (method->is_object_constructor() || method->is_class_initializer() ||
1847 method->is_overpass())) {
1848 continue;
1849 }
1850 if (publicOnly && !method->is_public()) {
1851 continue;
1852 }
1853 idnums->push(method->method_idnum());
1854 ++num_methods;
1855 }
1856
1857 // Allocate result
1858 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1859 objArrayHandle result (THREAD, r);
1860
1861 // Now just put the methods that we selected above, but go by their idnum
1862 // in case of redefinition. The methods can be redefined at any safepoint,
1863 // so above when allocating the oop array and below when creating reflect
1864 // objects.
1865 for (int i = 0; i < num_methods; i++) {
1866 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1867 if (method.is_null()) {
1868 // Method may have been deleted and seems this API can handle null
1869 // Otherwise should probably put a method that throws NSME
1870 result->obj_at_put(i, nullptr);
1871 } else {
1872 oop m;
1873 if (want_constructor) {
1874 assert(method->is_object_constructor(), "must be");
1875 m = Reflection::new_constructor(method, CHECK_NULL);
1876 } else {
1877 m = Reflection::new_method(method, false, CHECK_NULL);
1878 }
1879 result->obj_at_put(i, m);
1880 }
1881 }
1882
1883 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1884 }
1885
1886 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1887 {
1888 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1889 /*want_constructor*/ false,
1890 vmClasses::reflect_Method_klass(), THREAD);
1891 }
1892 JVM_END
1893
1894 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1895 {
1896 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1897 /*want_constructor*/ true,
1898 vmClasses::reflect_Constructor_klass(), THREAD);
1899 }
1900 JVM_END
1901
1902 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1903 {
1904 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1905 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1906 return c->has_nestmate_access_to(m, THREAD);
1907 }
1908 JVM_END
1909
1910 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1911 {
1912 // current is not a primitive or array class
1913 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1914 InstanceKlass* host = c->nest_host(THREAD);
1915 return (jclass) (host == nullptr ? nullptr :
1916 JNIHandles::make_local(THREAD, host->java_mirror()));
1917 }
1918 JVM_END
1919
1920 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1921 {
1922 // current is not a primitive or array class
1923 ResourceMark rm(THREAD);
1924 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1925 InstanceKlass* host = c->nest_host(THREAD);
1926
1927 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1928 c->external_name(), host->external_name());
1929 {
1930 JvmtiVMObjectAllocEventCollector oam;
1931 Array<u2>* members = host->nest_members();
1932 int length = members == nullptr ? 0 : members->length();
1933
1934 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1935
1936 // nest host is first in the array so make it one bigger
1937 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1938 length + 1, CHECK_NULL);
1939 objArrayHandle result(THREAD, r);
1940 result->obj_at_put(0, host->java_mirror());
1941 if (length != 0) {
1942 int count = 0;
1943 for (int i = 0; i < length; i++) {
1944 int cp_index = members->at(i);
1945 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1946 if (HAS_PENDING_EXCEPTION) {
1947 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1948 return nullptr; // propagate VMEs
1949 }
1950 if (log_is_enabled(Trace, class, nestmates)) {
1951 stringStream ss;
1952 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1953 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1954 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1955 log_trace(class, nestmates)("%s", ss.as_string());
1956 }
1957 CLEAR_PENDING_EXCEPTION;
1958 continue;
1959 }
1960 if (k->is_instance_klass()) {
1961 InstanceKlass* ik = InstanceKlass::cast(k);
1962 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1963 if (nest_host_k == host) {
1964 result->obj_at_put(count+1, k->java_mirror());
1965 count++;
1966 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1967 } else {
1968 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1969 ik->external_name(), nest_host_k->external_name());
1970 }
1971 } else {
1972 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1973 k->external_name());
1974 }
1975 }
1976 if (count < length) {
1977 // we had invalid entries so we need to compact the array
1978 log_trace(class, nestmates)(" - compacting array from length %d to %d",
1979 length + 1, count + 1);
1980
1981 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1982 count + 1, CHECK_NULL);
1983 objArrayHandle result2(THREAD, r2);
1984 for (int i = 0; i < count + 1; i++) {
1985 result2->obj_at_put(i, result->obj_at(i));
1986 }
1987 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1988 }
1989 }
1990 else {
1991 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
1992 }
1993 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1994 }
1995 }
1996 JVM_END
1997
1998 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
1999 {
2000 oop mirror = JNIHandles::resolve_non_null(current);
2001 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2002 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2003
2004 ResourceMark rm(THREAD);
2005 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2006 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2007 if (ik->is_sealed()) {
2008 JvmtiVMObjectAllocEventCollector oam;
2009 Array<u2>* subclasses = ik->permitted_subclasses();
2010 int length = subclasses->length();
2011
2012 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2013
2014 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2015 length, CHECK_NULL);
2016 objArrayHandle result(THREAD, r);
2017 int count = 0;
2018 for (int i = 0; i < length; i++) {
2019 int cp_index = subclasses->at(i);
2020 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2021 if (HAS_PENDING_EXCEPTION) {
2022 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2023 return nullptr; // propagate VMEs
2024 }
2025 if (log_is_enabled(Trace, class, sealed)) {
2026 stringStream ss;
2027 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2028 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2029 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2030 log_trace(class, sealed)("%s", ss.as_string());
2031 }
2032
2033 CLEAR_PENDING_EXCEPTION;
2034 continue;
2035 }
2036 if (k->is_instance_klass()) {
2037 result->obj_at_put(count++, k->java_mirror());
2038 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2039 }
2040 }
2041 if (count < length) {
2042 // we had invalid entries so we need to compact the array
2043 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2044 count, CHECK_NULL);
2045 objArrayHandle result2(THREAD, r2);
2046 for (int i = 0; i < count; i++) {
2047 result2->obj_at_put(i, result->obj_at(i));
2048 }
2049 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2050 }
2051 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2052 } else {
2053 return nullptr;
2054 }
2055 }
2056 JVM_END
2057
2058 // Constant pool access //////////////////////////////////////////////////////////
2059
2060 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2061 {
2062 JvmtiVMObjectAllocEventCollector oam;
2063 oop mirror = JNIHandles::resolve_non_null(cls);
2064 // Return null for primitives and arrays
2065 if (!java_lang_Class::is_primitive(mirror)) {
2066 Klass* k = java_lang_Class::as_Klass(mirror);
2067 if (k->is_instance_klass()) {
2068 InstanceKlass* k_h = InstanceKlass::cast(k);
2069 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2070 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2071 return JNIHandles::make_local(THREAD, jcp());
2072 }
2073 }
2074 return nullptr;
2075 }
2076 JVM_END
2077
2078
2079 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2080 {
2081 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2082 return cp->length();
2083 }
2084 JVM_END
2085
2086
2087 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2088 {
2089 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2090 bounds_check(cp, index, CHECK_NULL);
2091 constantTag tag = cp->tag_at(index);
2092 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2093 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2094 }
2095 Klass* k = cp->klass_at(index, CHECK_NULL);
2096 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2097 }
2098 JVM_END
2099
2100 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2101 {
2102 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2103 bounds_check(cp, index, CHECK_NULL);
2104 constantTag tag = cp->tag_at(index);
2105 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2106 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2107 }
2108 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2109 if (k == nullptr) return nullptr;
2110 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2111 }
2112 JVM_END
2113
2114 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2115 constantTag tag = cp->tag_at(index);
2116 if (!tag.is_method() && !tag.is_interface_method()) {
2117 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2118 }
2119 int klass_ref = cp->uncached_klass_ref_index_at(index);
2120 Klass* k_o;
2121 if (force_resolution) {
2122 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2123 } else {
2124 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2125 if (k_o == nullptr) return nullptr;
2126 }
2127 InstanceKlass* k = InstanceKlass::cast(k_o);
2128 Symbol* name = cp->uncached_name_ref_at(index);
2129 Symbol* sig = cp->uncached_signature_ref_at(index);
2130 methodHandle m (THREAD, k->find_method(name, sig));
2131 if (m.is_null()) {
2132 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2133 }
2134 oop method;
2135 if (m->is_object_constructor()) {
2136 method = Reflection::new_constructor(m, CHECK_NULL);
2137 } else {
2138 method = Reflection::new_method(m, true, CHECK_NULL);
2139 }
2140 return JNIHandles::make_local(THREAD, method);
2141 }
2142
2143 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2144 {
2145 JvmtiVMObjectAllocEventCollector oam;
2146 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2147 bounds_check(cp, index, CHECK_NULL);
2148 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2149 return res;
2150 }
2151 JVM_END
2152
2153 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2154 {
2155 JvmtiVMObjectAllocEventCollector oam;
2156 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2157 bounds_check(cp, index, CHECK_NULL);
2158 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2159 return res;
2160 }
2161 JVM_END
2162
2163 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2164 constantTag tag = cp->tag_at(index);
2165 if (!tag.is_field()) {
2166 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2167 }
2168 int klass_ref = cp->uncached_klass_ref_index_at(index);
2169 Klass* k_o;
2170 if (force_resolution) {
2171 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2172 } else {
2173 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2174 if (k_o == nullptr) return nullptr;
2175 }
2176 InstanceKlass* k = InstanceKlass::cast(k_o);
2177 Symbol* name = cp->uncached_name_ref_at(index);
2178 Symbol* sig = cp->uncached_signature_ref_at(index);
2179 fieldDescriptor fd;
2180 Klass* target_klass = k->find_field(name, sig, &fd);
2181 if (target_klass == nullptr) {
2182 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2183 }
2184 oop field = Reflection::new_field(&fd, CHECK_NULL);
2185 return JNIHandles::make_local(THREAD, field);
2186 }
2187
2188 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2189 {
2190 JvmtiVMObjectAllocEventCollector oam;
2191 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2192 bounds_check(cp, index, CHECK_NULL);
2193 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2194 return res;
2195 }
2196 JVM_END
2197
2198 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2199 {
2200 JvmtiVMObjectAllocEventCollector oam;
2201 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2202 bounds_check(cp, index, CHECK_NULL);
2203 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2204 return res;
2205 }
2206 JVM_END
2207
2208 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2209 {
2210 JvmtiVMObjectAllocEventCollector oam;
2211 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2212 bounds_check(cp, index, CHECK_NULL);
2213 constantTag tag = cp->tag_at(index);
2214 if (!tag.is_field_or_method()) {
2215 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2216 }
2217 int klass_ref = cp->uncached_klass_ref_index_at(index);
2218 Symbol* klass_name = cp->klass_name_at(klass_ref);
2219 Symbol* member_name = cp->uncached_name_ref_at(index);
2220 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2221 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2222 objArrayHandle dest(THREAD, dest_o);
2223 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2224 dest->obj_at_put(0, str());
2225 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2226 dest->obj_at_put(1, str());
2227 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2228 dest->obj_at_put(2, str());
2229 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2230 }
2231 JVM_END
2232
2233 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2234 {
2235 JvmtiVMObjectAllocEventCollector oam;
2236 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2237 bounds_check(cp, index, CHECK_0);
2238 constantTag tag = cp->tag_at(index);
2239 if (!tag.is_field_or_method()) {
2240 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2241 }
2242 return (jint) cp->uncached_klass_ref_index_at(index);
2243 }
2244 JVM_END
2245
2246 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2247 {
2248 JvmtiVMObjectAllocEventCollector oam;
2249 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2250 bounds_check(cp, index, CHECK_0);
2251 constantTag tag = cp->tag_at(index);
2252 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2253 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2254 }
2255 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2256 }
2257 JVM_END
2258
2259 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2260 {
2261 JvmtiVMObjectAllocEventCollector oam;
2262 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2263 bounds_check(cp, index, CHECK_NULL);
2264 constantTag tag = cp->tag_at(index);
2265 if (!tag.is_name_and_type()) {
2266 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2267 }
2268 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2269 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2270 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2271 objArrayHandle dest(THREAD, dest_o);
2272 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2273 dest->obj_at_put(0, str());
2274 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2275 dest->obj_at_put(1, str());
2276 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2277 }
2278 JVM_END
2279
2280 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2281 {
2282 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2283 bounds_check(cp, index, CHECK_0);
2284 constantTag tag = cp->tag_at(index);
2285 if (!tag.is_int()) {
2286 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2287 }
2288 return cp->int_at(index);
2289 }
2290 JVM_END
2291
2292 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2293 {
2294 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2295 bounds_check(cp, index, CHECK_(0L));
2296 constantTag tag = cp->tag_at(index);
2297 if (!tag.is_long()) {
2298 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2299 }
2300 return cp->long_at(index);
2301 }
2302 JVM_END
2303
2304 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2305 {
2306 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2307 bounds_check(cp, index, CHECK_(0.0f));
2308 constantTag tag = cp->tag_at(index);
2309 if (!tag.is_float()) {
2310 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2311 }
2312 return cp->float_at(index);
2313 }
2314 JVM_END
2315
2316 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2317 {
2318 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2319 bounds_check(cp, index, CHECK_(0.0));
2320 constantTag tag = cp->tag_at(index);
2321 if (!tag.is_double()) {
2322 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2323 }
2324 return cp->double_at(index);
2325 }
2326 JVM_END
2327
2328 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2329 {
2330 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2331 bounds_check(cp, index, CHECK_NULL);
2332 constantTag tag = cp->tag_at(index);
2333 if (!tag.is_string()) {
2334 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2335 }
2336 oop str = cp->string_at(index, CHECK_NULL);
2337 return (jstring) JNIHandles::make_local(THREAD, str);
2338 }
2339 JVM_END
2340
2341 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2342 {
2343 JvmtiVMObjectAllocEventCollector oam;
2344 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2345 bounds_check(cp, index, CHECK_NULL);
2346 constantTag tag = cp->tag_at(index);
2347 if (!tag.is_symbol()) {
2348 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2349 }
2350 Symbol* sym = cp->symbol_at(index);
2351 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2352 return (jstring) JNIHandles::make_local(THREAD, str());
2353 }
2354 JVM_END
2355
2356 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2357 {
2358 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2359 bounds_check(cp, index, CHECK_0);
2360 constantTag tag = cp->tag_at(index);
2361 jbyte result = tag.value();
2362 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2363 // they are changed to the corresponding tags from the JVM spec, so that java code in
2364 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2365 if (tag.is_klass_or_reference()) {
2366 result = JVM_CONSTANT_Class;
2367 } else if (tag.is_string_index()) {
2368 result = JVM_CONSTANT_String;
2369 } else if (tag.is_method_type_in_error()) {
2370 result = JVM_CONSTANT_MethodType;
2371 } else if (tag.is_method_handle_in_error()) {
2372 result = JVM_CONSTANT_MethodHandle;
2373 } else if (tag.is_dynamic_constant_in_error()) {
2374 result = JVM_CONSTANT_Dynamic;
2375 }
2376 return result;
2377 }
2378 JVM_END
2379
2380 // Assertion support. //////////////////////////////////////////////////////////
2381
2382 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2383 assert(cls != nullptr, "bad class");
2384
2385 oop r = JNIHandles::resolve(cls);
2386 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2387 if (java_lang_Class::is_primitive(r)) return false;
2388
2389 Klass* k = java_lang_Class::as_Klass(r);
2390 assert(k->is_instance_klass(), "must be an instance klass");
2391 if (!k->is_instance_klass()) return false;
2392
2393 ResourceMark rm(THREAD);
2394 const char* name = k->name()->as_C_string();
2395 bool system_class = k->class_loader() == nullptr;
2396 return JavaAssertions::enabled(name, system_class);
2397
2398 JVM_END
2399
2400
2401 // Return a new AssertionStatusDirectives object with the fields filled in with
2402 // command-line assertion arguments (i.e., -ea, -da).
2403 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2404 JvmtiVMObjectAllocEventCollector oam;
2405 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2406 return JNIHandles::make_local(THREAD, asd);
2407 JVM_END
2408
2409 // Verification ////////////////////////////////////////////////////////////////////////////////
2410
2411 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2412
2413 // RedefineClasses support: bug 6214132 caused verification to fail.
2414 // All functions from this section, unless noted otherwise, should call the functions
2415 // get_klass_considering_redefinition(), or
2416 // get_instance_klass_considering_redefinition()
2417 // These functions return JvmtiThreadState::_scratch_class if the verifier
2418 // was invoked in the middle of the redefinition of cls.
2419 // See jvmtiThreadState.hpp for details.
2420
2421 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2422 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2423 if (k->is_instance_klass()) {
2424 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2425 } else {
2426 return k;
2427 }
2428 }
2429
2430 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2431 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2432 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2433 }
2434
2435 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2436 oop mirror = JNIHandles::resolve_non_null(cls);
2437 if (java_lang_Class::is_primitive(mirror)) {
2438 return JNI_FALSE;
2439 }
2440 Klass* k = java_lang_Class::as_Klass(mirror);
2441 // This isn't necessary since answer is the same because redefinition
2442 // has already checked this matches for the scratch class.
2443 // k = get_klass_considering_redefinition(cls, thread)
2444 jboolean result = k->is_interface();
2445 assert(!result || k->is_instance_klass(),
2446 "all interfaces are instance types");
2447 return result;
2448 JVM_END
2449
2450 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2451 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2452 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2453 return k->name()->as_utf8();
2454 JVM_END
2455
2456
2457 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2458 Klass* k = get_klass_considering_redefinition(cls, thread);
2459 // types will have length zero if this is not an InstanceKlass
2460 // (length is determined by call to JVM_GetClassCPEntriesCount)
2461 if (k->is_instance_klass()) {
2462 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2463 for (int index = cp->length() - 1; index >= 0; index--) {
2464 constantTag tag = cp->tag_at(index);
2465 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2466 }
2467 }
2468 JVM_END
2469
2470
2471 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2472 Klass* k = get_klass_considering_redefinition(cls, thread);
2473 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2474 JVM_END
2475
2476
2477 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2478 Klass* k = get_klass_considering_redefinition(cls, thread);
2479 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2480 JVM_END
2481
2482
2483 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2484 Klass* k = get_klass_considering_redefinition(cls, thread);
2485 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2486 JVM_END
2487
2488
2489 // The following methods, used for the verifier, are never called with
2490 // array klasses, so a direct cast to InstanceKlass is safe.
2491 // Typically, these methods are called in a loop with bounds determined
2492 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2493 // zero for arrays.
2494 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2495 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2496 Method* method = ik->methods()->at(method_index);
2497 int length = method->checked_exceptions_length();
2498 if (length > 0) {
2499 CheckedExceptionElement* table= method->checked_exceptions_start();
2500 for (int i = 0; i < length; i++) {
2501 exceptions[i] = table[i].class_cp_index;
2502 }
2503 }
2504 JVM_END
2505
2506
2507 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2508 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2509 Method* method = ik->methods()->at(method_index);
2510 return method->checked_exceptions_length();
2511 JVM_END
2512
2513
2514 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2515 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2516 Method* method = ik->methods()->at(method_index);
2517 memcpy(code, method->code_base(), method->code_size());
2518 JVM_END
2519
2520
2521 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2522 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2523 Method* method = ik->methods()->at(method_index);
2524 return method->code_size();
2525 JVM_END
2526
2527
2528 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2529 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2530 Method* method = ik->methods()->at(method_index);
2531 ExceptionTable extable(method);
2532 entry->start_pc = extable.start_pc(entry_index);
2533 entry->end_pc = extable.end_pc(entry_index);
2534 entry->handler_pc = extable.handler_pc(entry_index);
2535 entry->catchType = extable.catch_type_index(entry_index);
2536 JVM_END
2537
2538
2539 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2540 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2541 Method* method = ik->methods()->at(method_index);
2542 return method->exception_table_length();
2543 JVM_END
2544
2545
2546 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2547 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2548 Method* method = ik->methods()->at(method_index);
2549 return method->access_flags().as_method_flags();
2550 JVM_END
2551
2552
2553 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2554 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2555 return ik->field_access_flags(field_index);
2556 JVM_END
2557
2558
2559 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2560 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2561 Method* method = ik->methods()->at(method_index);
2562 return method->max_locals();
2563 JVM_END
2564
2565
2566 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2567 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2568 Method* method = ik->methods()->at(method_index);
2569 return method->size_of_parameters();
2570 JVM_END
2571
2572
2573 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2574 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2575 Method* method = ik->methods()->at(method_index);
2576 return method->verifier_max_stack();
2577 JVM_END
2578
2579
2580 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2581 ResourceMark rm(THREAD);
2582 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2583 Method* method = ik->methods()->at(method_index);
2584 return method->is_object_constructor();
2585 JVM_END
2586
2587
2588 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2589 ResourceMark rm(THREAD);
2590 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2591 Method* method = ik->methods()->at(method_index);
2592 return method->is_overpass();
2593 JVM_END
2594
2595 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2596 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2597 Method* method = ik->methods()->at(method_index);
2598 return method->name()->as_utf8();
2599 JVM_END
2600
2601
2602 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2603 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2604 Method* method = ik->methods()->at(method_index);
2605 return method->signature()->as_utf8();
2606 JVM_END
2607
2608 /**
2609 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2610 * read entries in the constant pool. Since the old verifier always
2611 * works on a copy of the code, it will not see any rewriting that
2612 * may possibly occur in the middle of verification. So it is important
2613 * that nothing it calls tries to use the cpCache instead of the raw
2614 * constant pool, so we must use cp->uncached_x methods when appropriate.
2615 */
2616 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2617 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2618 ConstantPool* cp = ik->constants();
2619 switch (cp->tag_at(cp_index).value()) {
2620 case JVM_CONSTANT_Fieldref:
2621 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2622 default:
2623 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2624 }
2625 ShouldNotReachHere();
2626 return nullptr;
2627 JVM_END
2628
2629
2630 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2631 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2632 ConstantPool* cp = ik->constants();
2633 switch (cp->tag_at(cp_index).value()) {
2634 case JVM_CONSTANT_InterfaceMethodref:
2635 case JVM_CONSTANT_Methodref:
2636 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2637 default:
2638 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2639 }
2640 ShouldNotReachHere();
2641 return nullptr;
2642 JVM_END
2643
2644
2645 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2646 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2647 ConstantPool* cp = ik->constants();
2648 switch (cp->tag_at(cp_index).value()) {
2649 case JVM_CONSTANT_InterfaceMethodref:
2650 case JVM_CONSTANT_Methodref:
2651 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2652 default:
2653 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2654 }
2655 ShouldNotReachHere();
2656 return nullptr;
2657 JVM_END
2658
2659
2660 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2661 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2662 ConstantPool* cp = ik->constants();
2663 switch (cp->tag_at(cp_index).value()) {
2664 case JVM_CONSTANT_Fieldref:
2665 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2666 default:
2667 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2668 }
2669 ShouldNotReachHere();
2670 return nullptr;
2671 JVM_END
2672
2673
2674 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2675 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2676 ConstantPool* cp = ik->constants();
2677 Symbol* classname = cp->klass_name_at(cp_index);
2678 return classname->as_utf8();
2679 JVM_END
2680
2681
2682 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2683 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2684 ConstantPool* cp = ik->constants();
2685 switch (cp->tag_at(cp_index).value()) {
2686 case JVM_CONSTANT_Fieldref: {
2687 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2688 Symbol* classname = cp->klass_name_at(class_index);
2689 return classname->as_utf8();
2690 }
2691 default:
2692 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2693 }
2694 ShouldNotReachHere();
2695 return nullptr;
2696 JVM_END
2697
2698
2699 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2700 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2701 ConstantPool* cp = ik->constants();
2702 switch (cp->tag_at(cp_index).value()) {
2703 case JVM_CONSTANT_Methodref:
2704 case JVM_CONSTANT_InterfaceMethodref: {
2705 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2706 Symbol* classname = cp->klass_name_at(class_index);
2707 return classname->as_utf8();
2708 }
2709 default:
2710 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2711 }
2712 ShouldNotReachHere();
2713 return nullptr;
2714 JVM_END
2715
2716
2717 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2718 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2719 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2720 ConstantPool* cp = ik->constants();
2721 ConstantPool* cp_called = ik_called->constants();
2722 switch (cp->tag_at(cp_index).value()) {
2723 case JVM_CONSTANT_Fieldref: {
2724 Symbol* name = cp->uncached_name_ref_at(cp_index);
2725 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2726 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2727 if (fs.name() == name && fs.signature() == signature) {
2728 return fs.access_flags().as_field_flags();
2729 }
2730 }
2731 return -1;
2732 }
2733 default:
2734 fatal("JVM_GetCPFieldModifiers: illegal constant");
2735 }
2736 ShouldNotReachHere();
2737 return 0;
2738 JVM_END
2739
2740
2741 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2742 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2743 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2744 ConstantPool* cp = ik->constants();
2745 switch (cp->tag_at(cp_index).value()) {
2746 case JVM_CONSTANT_Methodref:
2747 case JVM_CONSTANT_InterfaceMethodref: {
2748 Symbol* name = cp->uncached_name_ref_at(cp_index);
2749 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2750 Array<Method*>* methods = ik_called->methods();
2751 int methods_count = methods->length();
2752 for (int i = 0; i < methods_count; i++) {
2753 Method* method = methods->at(i);
2754 if (method->name() == name && method->signature() == signature) {
2755 return method->access_flags().as_method_flags();
2756 }
2757 }
2758 return -1;
2759 }
2760 default:
2761 fatal("JVM_GetCPMethodModifiers: illegal constant");
2762 }
2763 ShouldNotReachHere();
2764 return 0;
2765 JVM_END
2766
2767
2768 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2769
2770 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2771 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2772 JVM_END
2773
2774
2775 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2776 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2777 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2778 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2779 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2780 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2781 JVM_END
2782
2783 // Printing support //////////////////////////////////////////////////
2784 extern "C" {
2785
2786 ATTRIBUTE_PRINTF(3, 0)
2787 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2788 // Reject count values that are negative signed values converted to
2789 // unsigned; see bug 4399518, 4417214
2790 if ((intptr_t)count <= 0) return -1;
2791
2792 int result = os::vsnprintf(str, count, fmt, args);
2793 if (result > 0 && (size_t)result >= count) {
2794 result = -1;
2795 }
2796
2797 return result;
2798 }
2799
2800 ATTRIBUTE_PRINTF(3, 4)
2801 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2802 va_list args;
2803 int len;
2804 va_start(args, fmt);
2805 len = jio_vsnprintf(str, count, fmt, args);
2806 va_end(args);
2807 return len;
2808 }
2809
2810 ATTRIBUTE_PRINTF(2, 3)
2811 int jio_fprintf(FILE* f, const char *fmt, ...) {
2812 int len;
2813 va_list args;
2814 va_start(args, fmt);
2815 len = jio_vfprintf(f, fmt, args);
2816 va_end(args);
2817 return len;
2818 }
2819
2820 ATTRIBUTE_PRINTF(2, 0)
2821 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2822 if (Arguments::vfprintf_hook() != nullptr) {
2823 return Arguments::vfprintf_hook()(f, fmt, args);
2824 } else {
2825 return vfprintf(f, fmt, args);
2826 }
2827 }
2828
2829 ATTRIBUTE_PRINTF(1, 2)
2830 JNIEXPORT int jio_printf(const char *fmt, ...) {
2831 int len;
2832 va_list args;
2833 va_start(args, fmt);
2834 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2835 va_end(args);
2836 return len;
2837 }
2838
2839 // HotSpot specific jio method
2840 void jio_print(const char* s, size_t len) {
2841 // Try to make this function as atomic as possible.
2842 if (Arguments::vfprintf_hook() != nullptr) {
2843 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2844 } else {
2845 // Make an unused local variable to avoid warning from gcc compiler.
2846 bool dummy = os::write(defaultStream::output_fd(), s, len);
2847 }
2848 }
2849
2850 } // Extern C
2851
2852 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2853
2854 // In most of the JVM thread support functions we need to access the
2855 // thread through a ThreadsListHandle to prevent it from exiting and
2856 // being reclaimed while we try to operate on it. The exceptions to this
2857 // rule are when operating on the current thread, or if the monitor of
2858 // the target java.lang.Thread is locked at the Java level - in both
2859 // cases the target cannot exit.
2860
2861 static void thread_entry(JavaThread* thread, TRAPS) {
2862 HandleMark hm(THREAD);
2863 Handle obj(THREAD, thread->threadObj());
2864 JavaValue result(T_VOID);
2865 JavaCalls::call_virtual(&result,
2866 obj,
2867 vmClasses::Thread_klass(),
2868 vmSymbols::run_method_name(),
2869 vmSymbols::void_method_signature(),
2870 THREAD);
2871 }
2872
2873
2874 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2875 #if INCLUDE_CDS
2876 if (CDSConfig::allow_only_single_java_thread()) {
2877 // During java -Xshare:dump, if we allow multiple Java threads to
2878 // execute in parallel, symbols and classes may be loaded in
2879 // random orders which will make the resulting CDS archive
2880 // non-deterministic.
2881 //
2882 // Lucikly, during java -Xshare:dump, it's important to run only
2883 // the code in the main Java thread (which is NOT started here) that
2884 // creates the module graph, etc. It's safe to not start the other
2885 // threads which are launched by class static initializers
2886 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2887 if (log_is_enabled(Info, aot)) {
2888 ResourceMark rm;
2889 oop t = JNIHandles::resolve_non_null(jthread);
2890 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2891 }
2892 return;
2893 }
2894 #endif
2895 JavaThread *native_thread = nullptr;
2896
2897 // We cannot hold the Threads_lock when we throw an exception,
2898 // due to rank ordering issues. Example: we might need to grab the
2899 // Heap_lock while we construct the exception.
2900 bool throw_illegal_thread_state = false;
2901
2902 // We must release the Threads_lock before we can post a jvmti event
2903 // in Thread::start.
2904 {
2905 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2906 // Ensure that the C++ Thread and OSThread structures aren't freed before
2907 // we operate.
2908 MutexLocker ml(Threads_lock);
2909
2910 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2911 // re-starting an already started thread, so we should usually find
2912 // that the JavaThread is null. However for a JNI attached thread
2913 // there is a small window between the Thread object being created
2914 // (with its JavaThread set) and the update to its threadStatus, so we
2915 // have to check for this
2916 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2917 throw_illegal_thread_state = true;
2918 } else {
2919 jlong size =
2920 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2921 // Allocate the C++ Thread structure and create the native thread. The
2922 // stack size retrieved from java is 64-bit signed, but the constructor takes
2923 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2924 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2925 // - Avoid passing negative values which would result in really large stacks.
2926 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2927 size_t sz = size > 0 ? (size_t) size : 0;
2928 native_thread = new JavaThread(&thread_entry, sz);
2929
2930 // At this point it may be possible that no osthread was created for the
2931 // JavaThread due to lack of memory. Check for this situation and throw
2932 // an exception if necessary. Eventually we may want to change this so
2933 // that we only grab the lock if the thread was created successfully -
2934 // then we can also do this check and throw the exception in the
2935 // JavaThread constructor.
2936 if (native_thread->osthread() != nullptr) {
2937 // Note: the current thread is not being used within "prepare".
2938 native_thread->prepare(jthread);
2939 }
2940 }
2941 }
2942
2943 if (throw_illegal_thread_state) {
2944 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2945 }
2946
2947 assert(native_thread != nullptr, "Starting null thread?");
2948
2949 if (native_thread->osthread() == nullptr) {
2950 ResourceMark rm(thread);
2951 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2952 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2953 // No one should hold a reference to the 'native_thread'.
2954 native_thread->smr_delete();
2955 if (JvmtiExport::should_post_resource_exhausted()) {
2956 JvmtiExport::post_resource_exhausted(
2957 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2958 os::native_thread_creation_failed_msg());
2959 }
2960 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2961 os::native_thread_creation_failed_msg());
2962 }
2963
2964 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2965
2966 Thread::start(native_thread);
2967
2968 JVM_END
2969
2970
2971 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2972 ThreadsListHandle tlh(thread);
2973 oop java_thread = nullptr;
2974 JavaThread* receiver = nullptr;
2975 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2976 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2977
2978 if (is_alive) {
2979 // jthread refers to a live JavaThread.
2980 Thread::set_priority(receiver, (ThreadPriority)prio);
2981 }
2982 // Implied else: If the JavaThread hasn't started yet, then the
2983 // priority set in the java.lang.Thread object above will be pushed
2984 // down when it does start.
2985 JVM_END
2986
2987
2988 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2989 HOTSPOT_THREAD_YIELD();
2990 os::naked_yield();
2991 JVM_END
2992
2993 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
2994 if (nanos < 0) {
2995 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
2996 }
2997
2998 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
2999 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3000 }
3001
3002 // Save current thread state and restore it at the end of this block.
3003 // And set new thread state to SLEEPING.
3004 JavaThreadSleepState jtss(thread);
3005
3006 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3007
3008 if (nanos == 0) {
3009 os::naked_yield();
3010 } else {
3011 ThreadState old_state = thread->osthread()->get_state();
3012 thread->osthread()->set_state(SLEEPING);
3013 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3014 // An asynchronous exception could have been thrown on
3015 // us while we were sleeping. We do not overwrite those.
3016 if (!HAS_PENDING_EXCEPTION) {
3017 HOTSPOT_THREAD_SLEEP_END(1);
3018 if (!thread->has_async_exception_condition()) {
3019 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3020 // to properly restore the thread state. That's likely wrong.
3021 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3022 }
3023 }
3024 }
3025 thread->osthread()->set_state(old_state);
3026 }
3027 HOTSPOT_THREAD_SLEEP_END(0);
3028 JVM_END
3029
3030 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3031 oop jthread = thread->threadObj();
3032 assert(jthread != nullptr, "no current carrier thread!");
3033 return JNIHandles::make_local(THREAD, jthread);
3034 JVM_END
3035
3036 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3037 oop theThread = thread->vthread();
3038 assert(theThread != (oop)nullptr, "no current thread!");
3039 return JNIHandles::make_local(THREAD, theThread);
3040 JVM_END
3041
3042 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3043 jobject theThread))
3044 oop threadObj = JNIHandles::resolve(theThread);
3045 thread->set_vthread(threadObj);
3046
3047 // Set _monitor_owner_id of new current Thread
3048 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3049
3050 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3051 JVM_END
3052
3053 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3054 return ThreadIdentifier::unsafe_offset();
3055 JVM_END
3056
3057 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3058 ThreadsListHandle tlh(thread);
3059 JavaThread* receiver = nullptr;
3060 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3061 if (is_alive) {
3062 // jthread refers to a live JavaThread.
3063 receiver->interrupt();
3064 }
3065 JVM_END
3066
3067 // Return true iff the current thread has locked the object passed in
3068
3069 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3070 if (obj == nullptr) {
3071 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3072 }
3073 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3074 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3075 JVM_END
3076
3077 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3078 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3079 return JNIHandles::make_local(THREAD, trace);
3080 JVM_END
3081
3082 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3083 #if INCLUDE_JVMTI
3084 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3085 return JNIHandles::make_local(THREAD, snapshot);
3086 #else
3087 THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
3088 #endif
3089 JVM_END
3090
3091 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3092 // We don't use a ThreadsListHandle here because the current thread
3093 // must be alive.
3094 oop java_thread = JNIHandles::resolve_non_null(jthread);
3095 JavaThread* thr = java_lang_Thread::thread(java_thread);
3096 if (thread == thr && !thr->has_attached_via_jni()) {
3097 // Thread naming is only supported for the current thread and
3098 // we don't set the name of an attached thread to avoid stepping
3099 // on other programs.
3100 ResourceMark rm(thread);
3101 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3102 os::set_native_thread_name(thread_name);
3103 }
3104 JVM_END
3105
3106 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3107 oop theCache = thread->scopedValueCache();
3108 return JNIHandles::make_local(THREAD, theCache);
3109 JVM_END
3110
3111 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3112 jobject theCache))
3113 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3114 thread->set_scopedValueCache(objs);
3115 JVM_END
3116
3117
3118 // java.lang.Package ////////////////////////////////////////////////////////////////
3119
3120
3121 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3122 ResourceMark rm(THREAD);
3123 JvmtiVMObjectAllocEventCollector oam;
3124 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3125 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3126 return (jstring) JNIHandles::make_local(THREAD, result);
3127 JVM_END
3128
3129
3130 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3131 JvmtiVMObjectAllocEventCollector oam;
3132 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3133 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3134 JVM_END
3135
3136
3137 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3138
3139
3140 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3141 MonitorLocker ml(Heap_lock);
3142 oop ref = Universe::reference_pending_list();
3143 if (ref != nullptr) {
3144 Universe::clear_reference_pending_list();
3145 }
3146 return JNIHandles::make_local(THREAD, ref);
3147 JVM_END
3148
3149 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3150 MonitorLocker ml(Heap_lock);
3151 return Universe::has_reference_pending_list();
3152 JVM_END
3153
3154 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3155 MonitorLocker ml(Heap_lock);
3156 while (!Universe::has_reference_pending_list()) {
3157 ml.wait();
3158 }
3159 JVM_END
3160
3161 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3162 oop ref_oop = JNIHandles::resolve_non_null(ref);
3163 // PhantomReference has its own implementation of get().
3164 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3165 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3166 return JNIHandles::make_local(THREAD, referent);
3167 JVM_END
3168
3169 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3170 oop ref_oop = JNIHandles::resolve_non_null(ref);
3171 // PhantomReference has its own implementation of refersTo().
3172 // See: JVM_PhantomReferenceRefersTo
3173 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3174 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3175 return referent == JNIHandles::resolve(o);
3176 JVM_END
3177
3178 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3179 oop ref_oop = JNIHandles::resolve_non_null(ref);
3180 // FinalReference has it's own implementation of clear().
3181 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3182 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3183 // If the referent has already been cleared then done.
3184 // However, if the referent is dead but has not yet been cleared by
3185 // concurrent reference processing, it should NOT be cleared here.
3186 // Instead, clearing should be left to the GC. Clearing it here could
3187 // detectably lose an expected notification, which is impossible with
3188 // STW reference processing. The clearing in enqueue() doesn't have
3189 // this problem, since the enqueue covers the notification, but it's not
3190 // worth the effort to handle that case specially.
3191 return;
3192 }
3193 java_lang_ref_Reference::clear_referent(ref_oop);
3194 JVM_END
3195
3196
3197 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3198
3199
3200 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3201 oop ref_oop = JNIHandles::resolve_non_null(ref);
3202 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3203 return referent == JNIHandles::resolve(o);
3204 JVM_END
3205
3206
3207 // ObjectInputStream ///////////////////////////////////////////////////////////////
3208
3209 // Return the first user-defined class loader up the execution stack, or null
3210 // if only code from the bootstrap or platform class loader is on the stack.
3211
3212 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3213 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3214 InstanceKlass* ik = vfst.method()->method_holder();
3215 oop loader = ik->class_loader();
3216 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3217 return JNIHandles::make_local(THREAD, loader);
3218 }
3219 }
3220 return nullptr;
3221 JVM_END
3222
3223
3224 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3225
3226
3227 // resolve array handle and check arguments
3228 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3229 if (arr == nullptr) {
3230 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3231 }
3232 oop a = JNIHandles::resolve_non_null(arr);
3233 if (!a->is_array()) {
3234 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3235 } else if (type_array_only && !a->is_typeArray()) {
3236 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3237 }
3238 return arrayOop(a);
3239 }
3240
3241
3242 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3243 arrayOop a = check_array(env, arr, false, CHECK_0);
3244 return a->length();
3245 JVM_END
3246
3247
3248 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3249 JvmtiVMObjectAllocEventCollector oam;
3250 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3251 jvalue value;
3252 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3253 oop box = Reflection::box(&value, type, CHECK_NULL);
3254 return JNIHandles::make_local(THREAD, box);
3255 JVM_END
3256
3257
3258 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3259 jvalue value;
3260 value.i = 0; // to initialize value before getting used in CHECK
3261 arrayOop a = check_array(env, arr, true, CHECK_(value));
3262 assert(a->is_typeArray(), "just checking");
3263 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3264 BasicType wide_type = (BasicType) wCode;
3265 if (type != wide_type) {
3266 Reflection::widen(&value, type, wide_type, CHECK_(value));
3267 }
3268 return value;
3269 JVM_END
3270
3271
3272 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3273 arrayOop a = check_array(env, arr, false, CHECK);
3274 oop box = JNIHandles::resolve(val);
3275 jvalue value;
3276 value.i = 0; // to initialize value before getting used in CHECK
3277 BasicType value_type;
3278 if (a->is_objArray()) {
3279 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3280 value_type = Reflection::unbox_for_regular_object(box, &value);
3281 } else {
3282 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3283 }
3284 Reflection::array_set(&value, a, index, value_type, CHECK);
3285 JVM_END
3286
3287
3288 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3289 arrayOop a = check_array(env, arr, true, CHECK);
3290 assert(a->is_typeArray(), "just checking");
3291 BasicType value_type = (BasicType) vCode;
3292 Reflection::array_set(&v, a, index, value_type, CHECK);
3293 JVM_END
3294
3295
3296 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3297 JvmtiVMObjectAllocEventCollector oam;
3298 oop element_mirror = JNIHandles::resolve(eltClass);
3299 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3300 return JNIHandles::make_local(THREAD, result);
3301 JVM_END
3302
3303
3304 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3305 JvmtiVMObjectAllocEventCollector oam;
3306 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3307 oop element_mirror = JNIHandles::resolve(eltClass);
3308 assert(dim_array->is_typeArray(), "just checking");
3309 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3310 return JNIHandles::make_local(THREAD, result);
3311 JVM_END
3312
3313
3314 // Library support ///////////////////////////////////////////////////////////////////////////
3315
3316 JVM_LEAF(void*, JVM_LoadZipLibrary())
3317 return ZipLibrary::handle();
3318 JVM_END
3319
3320 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3321 //%note jvm_ct
3322 char ebuf[1024];
3323 void *load_result;
3324 {
3325 ThreadToNativeFromVM ttnfvm(thread);
3326 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3327 }
3328 if (load_result == nullptr) {
3329 if (throwException) {
3330 char msg[1024];
3331 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3332 // Since 'ebuf' may contain a string encoded using
3333 // platform encoding scheme, we need to pass
3334 // Exceptions::unsafe_to_utf8 to the new_exception method
3335 // as the last argument. See bug 6367357.
3336 Handle h_exception =
3337 Exceptions::new_exception(thread,
3338 vmSymbols::java_lang_UnsatisfiedLinkError(),
3339 msg, Exceptions::unsafe_to_utf8);
3340
3341 THROW_HANDLE_NULL(h_exception);
3342 } else {
3343 log_info(library)("Failed to load library %s", name);
3344 return load_result;
3345 }
3346 }
3347 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3348 return load_result;
3349 JVM_END
3350
3351
3352 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3353 os::dll_unload(handle);
3354 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3355 JVM_END
3356
3357
3358 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3359 void* find_result = os::dll_lookup(handle, name);
3360 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3361 find_result != nullptr ? "Found" : "Failed to find",
3362 name, p2i(handle));
3363 return find_result;
3364 JVM_END
3365
3366
3367 // JNI version ///////////////////////////////////////////////////////////////////////////////
3368
3369 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3370 return Threads::is_supported_jni_version_including_1_1(version);
3371 JVM_END
3372
3373
3374 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3375 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3376 JVM_END
3377
3378 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3379 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3380 JVM_END
3381
3382 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3383 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3384 JVM_END
3385
3386 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3387 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3388 JVM_END
3389
3390 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3391 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3392 JVM_END
3393
3394 // String support ///////////////////////////////////////////////////////////////////////////
3395
3396 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3397 JvmtiVMObjectAllocEventCollector oam;
3398 if (str == nullptr) return nullptr;
3399 oop string = JNIHandles::resolve_non_null(str);
3400 oop result = StringTable::intern(string, CHECK_NULL);
3401 return (jstring) JNIHandles::make_local(THREAD, result);
3402 JVM_END
3403
3404
3405 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3406
3407 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3408 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3409 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3410 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3411 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3412 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3413
3414
3415 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3416 VM_Exit::block_if_vm_exited();
3417 return new PlatformMutex();
3418 }
3419
3420
3421 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3422 VM_Exit::block_if_vm_exited();
3423 delete ((PlatformMutex*) mon);
3424 }
3425
3426
3427 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3428 VM_Exit::block_if_vm_exited();
3429 ((PlatformMutex*) mon)->lock();
3430 return 0;
3431 }
3432
3433
3434 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3435 VM_Exit::block_if_vm_exited();
3436 ((PlatformMutex*) mon)->unlock();
3437 }
3438
3439
3440 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3441
3442 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3443 Handle loader, jboolean throwError, TRAPS) {
3444 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3445
3446 // Check if we should initialize the class
3447 if (init && klass->is_instance_klass()) {
3448 klass->initialize(CHECK_NULL);
3449 }
3450 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3451 }
3452
3453
3454 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3455
3456 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3457 Handle method_handle;
3458 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3459 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3460 Handle receiver(THREAD, JNIHandles::resolve(obj));
3461 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3462 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3463
3464 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3465 jobject res = JNIHandles::make_local(THREAD, result);
3466 if (JvmtiExport::should_post_vm_object_alloc()) {
3467 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3468 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3469 if (java_lang_Class::is_primitive(ret_type)) {
3470 // Only for primitive type vm allocates memory for java object.
3471 // See box() method.
3472 JvmtiExport::post_vm_object_alloc(thread, result);
3473 }
3474 }
3475 return res;
3476 } else {
3477 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3478 }
3479 JVM_END
3480
3481
3482 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3483 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3484 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3485 oop constructor_mirror = JNIHandles::resolve(c);
3486 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3487 jobject res = JNIHandles::make_local(THREAD, result);
3488 if (JvmtiExport::should_post_vm_object_alloc()) {
3489 JvmtiExport::post_vm_object_alloc(thread, result);
3490 }
3491 return res;
3492 JVM_END
3493
3494 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3495 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3496 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3497 JVM_END
3498
3499 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3500 jclass caller,
3501 jstring interfaceMethodName,
3502 jobject factoryType,
3503 jobject interfaceMethodType,
3504 jobject implementationMember,
3505 jobject dynamicMethodType,
3506 jclass lambdaProxyClass))
3507 #if INCLUDE_CDS
3508 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3509 return;
3510 }
3511
3512 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3513 if (caller_ik->is_hidden()) {
3514 // Hidden classes not of type lambda proxy classes are currently not being archived.
3515 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3516 // registered for archiving.
3517 return;
3518 }
3519 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3520 assert(lambda_ik->is_hidden(), "must be a hidden class");
3521 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3522
3523 Symbol* interface_method_name = nullptr;
3524 if (interfaceMethodName != nullptr) {
3525 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3526 }
3527 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3528 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3529
3530 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3531 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3532
3533 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3534 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3535 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3536
3537 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3538 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3539
3540 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3541 interface_method_type, m, dynamic_method_type, THREAD);
3542 #endif // INCLUDE_CDS
3543 JVM_END
3544
3545 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3546 jclass caller,
3547 jstring interfaceMethodName,
3548 jobject factoryType,
3549 jobject interfaceMethodType,
3550 jobject implementationMember,
3551 jobject dynamicMethodType))
3552 #if INCLUDE_CDS
3553
3554 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3555 implementationMember == nullptr || dynamicMethodType == nullptr) {
3556 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3557 }
3558
3559 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3560 if (!caller_ik->in_aot_cache()) {
3561 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3562 return nullptr;
3563 }
3564
3565 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3566 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3567 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3568
3569 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3570 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3571
3572 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3573 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3574 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3575
3576 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3577 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3578
3579 InstanceKlass* loaded_lambda =
3580 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3581 interface_method_type, m, dynamic_method_type,
3582 CHECK_(nullptr));
3583 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3584 #else
3585 return nullptr;
3586 #endif // INCLUDE_CDS
3587 JVM_END
3588
3589 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3590 if (CDSConfig::is_dumping_static_archive()) {
3591 // We do this so that the default CDS archive can be deterministic.
3592 const char* release = VM_Version::vm_release();
3593 const char* dbg_level = VM_Version::jdk_debug_level();
3594 const char* version = VM_Version::internal_vm_info_string();
3595 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3596 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3597 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3598 seed += (jlong)VM_Version::vm_major_version();
3599 seed += (jlong)VM_Version::vm_minor_version();
3600 seed += (jlong)VM_Version::vm_security_version();
3601 seed += (jlong)VM_Version::vm_patch_version();
3602 if (seed == 0) { // don't let this ever be zero.
3603 seed = 0x87654321;
3604 }
3605 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3606 return seed;
3607 } else {
3608 return 0;
3609 }
3610 JVM_END
3611
3612 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3613 return CDSConfig::get_status();
3614 JVM_END
3615
3616 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3617 #if INCLUDE_CDS
3618 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3619 if (line != nullptr) {
3620 ResourceMark rm(THREAD);
3621 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3622 char* c_line = java_lang_String::as_utf8_string(h_line());
3623 if (CDSConfig::is_dumping_dynamic_archive()) {
3624 // Note: LambdaFormInvokers::append take same format which is not
3625 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3626 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3627 }
3628 if (ClassListWriter::is_enabled()) {
3629 ClassListWriter w;
3630 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3631 }
3632 }
3633 #endif // INCLUDE_CDS
3634 JVM_END
3635
3636 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3637 #if INCLUDE_CDS
3638 ResourceMark rm(THREAD);
3639 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3640 char* file_name = java_lang_String::as_utf8_string(file_handle());
3641 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3642 #endif // INCLUDE_CDS
3643 JVM_END
3644
3645 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3646 #if INCLUDE_CDS
3647 ResourceMark rm(THREAD);
3648 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3649 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3650 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3651 #endif // INCLUDE_CDS
3652 JVM_END
3653
3654 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3655 #if INCLUDE_CDS
3656 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3657 if (!k->is_instance_klass()) {
3658 return false;
3659 } else {
3660 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3661 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3662 // This class will be cached in AOT-initialized state. No need for init barriers.
3663 return false;
3664 } else {
3665 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3666 // must emit barriers to ensure class initialization during production run.
3667 ResourceMark rm(THREAD);
3668 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3669 return true;
3670 }
3671 }
3672 #else
3673 return false;
3674 #endif // INCLUDE_CDS
3675 JVM_END
3676
3677 // Returns an array of all live Thread objects (VM internal JavaThreads,
3678 // jvmti agent threads, and JNI attaching threads are skipped)
3679 // See CR 6404306 regarding JNI attaching threads
3680 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3681 ResourceMark rm(THREAD);
3682 ThreadsListEnumerator tle(THREAD, false, false);
3683 JvmtiVMObjectAllocEventCollector oam;
3684
3685 int num_threads = tle.num_threads();
3686 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3687 objArrayHandle threads_ah(THREAD, r);
3688
3689 for (int i = 0; i < num_threads; i++) {
3690 Handle h = tle.get_threadObj(i);
3691 threads_ah->obj_at_put(i, h());
3692 }
3693
3694 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3695 JVM_END
3696
3697
3698 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3699 // Return StackTraceElement[][], each element is the stack trace of a thread in
3700 // the corresponding entry in the given threads array
3701 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3702 JvmtiVMObjectAllocEventCollector oam;
3703
3704 // Check if threads is null
3705 if (threads == nullptr) {
3706 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3707 }
3708
3709 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3710 objArrayHandle ah(THREAD, a);
3711 int num_threads = ah->length();
3712 // check if threads is non-empty array
3713 if (num_threads == 0) {
3714 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3715 }
3716
3717 // check if threads is not an array of objects of Thread class
3718 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3719 if (k != vmClasses::Thread_klass()) {
3720 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3721 }
3722 refArrayHandle rah(THREAD, (refArrayOop)ah()); // j.l.Thread is an identity class, arrays are always reference arrays
3723
3724 ResourceMark rm(THREAD);
3725
3726 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3727 for (int i = 0; i < num_threads; i++) {
3728 oop thread_obj = rah->obj_at(i);
3729 instanceHandle h(THREAD, (instanceOop) thread_obj);
3730 thread_handle_array->append(h);
3731 }
3732
3733 // The JavaThread references in thread_handle_array are validated
3734 // in VM_ThreadDump::doit().
3735 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3736 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3737
3738 JVM_END
3739
3740 // JVM monitoring and management support
3741 JVM_LEAF(void*, JVM_GetManagement(jint version))
3742 return Management::get_jmm_interface(version);
3743 JVM_END
3744
3745 // com.sun.tools.attach.VirtualMachine agent properties support
3746 //
3747 // Initialize the agent properties with the properties maintained in the VM
3748 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3749 ResourceMark rm;
3750
3751 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3752
3753 PUTPROP(props, "sun.java.command", Arguments::java_command());
3754 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3755 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3756 return properties;
3757 JVM_END
3758
3759 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3760 {
3761 JvmtiVMObjectAllocEventCollector oam;
3762
3763 if (ofClass == nullptr) {
3764 return nullptr;
3765 }
3766 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3767 // Special handling for primitive objects
3768 if (java_lang_Class::is_primitive(mirror())) {
3769 return nullptr;
3770 }
3771 Klass* k = java_lang_Class::as_Klass(mirror());
3772 if (!k->is_instance_klass()) {
3773 return nullptr;
3774 }
3775 InstanceKlass* ik = InstanceKlass::cast(k);
3776 int encl_method_class_idx = ik->enclosing_method_class_index();
3777 if (encl_method_class_idx == 0) {
3778 return nullptr;
3779 }
3780 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3781 objArrayHandle dest(THREAD, dest_o);
3782 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3783 dest->obj_at_put(0, enc_k->java_mirror());
3784 int encl_method_method_idx = ik->enclosing_method_method_index();
3785 if (encl_method_method_idx != 0) {
3786 Symbol* sym = ik->constants()->symbol_at(
3787 extract_low_short_from_int(
3788 ik->constants()->name_and_type_at(encl_method_method_idx)));
3789 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3790 dest->obj_at_put(1, str());
3791 sym = ik->constants()->symbol_at(
3792 extract_high_short_from_int(
3793 ik->constants()->name_and_type_at(encl_method_method_idx)));
3794 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3795 dest->obj_at_put(2, str());
3796 }
3797 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3798 }
3799 JVM_END
3800
3801 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3802 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3803 ResourceMark rm(THREAD);
3804
3805 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3806 return nullptr;
3807 }
3808
3809 char** vm_flags = Arguments::jvm_flags_array();
3810 char** vm_args = Arguments::jvm_args_array();
3811 int num_flags = Arguments::num_jvm_flags();
3812 int num_args = Arguments::num_jvm_args();
3813
3814 InstanceKlass* ik = vmClasses::String_klass();
3815 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3816 objArrayHandle result_h(THREAD, r);
3817
3818 int index = 0;
3819 for (int j = 0; j < num_flags; j++, index++) {
3820 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3821 result_h->obj_at_put(index, h());
3822 }
3823 for (int i = 0; i < num_args; i++, index++) {
3824 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3825 result_h->obj_at_put(index, h());
3826 }
3827 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3828 JVM_END
3829
3830 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3831 return os::get_signal_number(name);
3832 JVM_END
3833
3834 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3835 #if INCLUDE_JVMTI
3836 if (!DoJVMTIVirtualThreadTransitions) {
3837 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3838 return;
3839 }
3840 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3841 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3842 } else {
3843 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3844 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3845 }
3846 #endif
3847 JVM_END
3848
3849 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3850 #if INCLUDE_JVMTI
3851 if (!DoJVMTIVirtualThreadTransitions) {
3852 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3853 return;
3854 }
3855 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3856 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3857 } else {
3858 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3859 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3860 }
3861 #endif
3862 JVM_END
3863
3864 // If notifications are disabled then just update the VTMS transition bit and return.
3865 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3866 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3867 #if INCLUDE_JVMTI
3868 if (!DoJVMTIVirtualThreadTransitions) {
3869 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3870 return;
3871 }
3872 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3873 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3874 } else {
3875 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3876 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3877 }
3878 #endif
3879 JVM_END
3880
3881 // If notifications are disabled then just update the VTMS transition bit and return.
3882 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3883 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3884 #if INCLUDE_JVMTI
3885 if (!DoJVMTIVirtualThreadTransitions) {
3886 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3887 return;
3888 }
3889 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3890 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3891 } else {
3892 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3893 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3894 }
3895 #endif
3896 JVM_END
3897
3898 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3899 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3900 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3901 #if INCLUDE_JVMTI
3902 if (!DoJVMTIVirtualThreadTransitions) {
3903 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3904 return;
3905 }
3906 assert(thread->is_disable_suspend() != (bool)enter,
3907 "nested or unbalanced monitor enter/exit is not allowed");
3908 thread->toggle_is_disable_suspend();
3909 #endif
3910 JVM_END
3911
3912 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3913 #if INCLUDE_JFR
3914 freeze_result result = THREAD->last_freeze_fail_result();
3915 assert(result != freeze_ok, "sanity check");
3916 EventVirtualThreadPinned event(UNTIMED);
3917 event.set_starttime(THREAD->last_freeze_fail_time());
3918 if (event.should_commit()) {
3919 ResourceMark rm(THREAD);
3920 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3921 THREAD->post_vthread_pinned_event(&event, str, result);
3922 }
3923 #endif
3924 JVM_END
3925
3926 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3927 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3928 assert(parkEvent != nullptr, "not initialized");
3929
3930 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3931 oop vthread_head = nullptr;
3932 while (true) {
3933 if (list_head.peek() != nullptr) {
3934 for (;;) {
3935 oop head = list_head.resolve();
3936 if (list_head.cmpxchg(head, nullptr) == head) {
3937 return JNIHandles::make_local(THREAD, head);
3938 }
3939 }
3940 }
3941 ThreadBlockInVM tbivm(THREAD);
3942 parkEvent->park();
3943 }
3944 JVM_END
3945 /*
3946 * Return the current class's class file version. The low order 16 bits of the
3947 * returned jint contain the class's major version. The high order 16 bits
3948 * contain the class's minor version.
3949 */
3950 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3951 oop mirror = JNIHandles::resolve_non_null(current);
3952 if (java_lang_Class::is_primitive(mirror)) {
3953 // return latest major version and minor version of 0.
3954 return JVM_CLASSFILE_MAJOR_VERSION;
3955 }
3956 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3957 return (ik->minor_version() << 16) | ik->major_version();
3958 JVM_END
3959
3960 /*
3961 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3962 * get the value will see a materialized value and not a scalar-replaced
3963 * null value.
3964 */
3965 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3966 JVM_EnsureMaterializedForStackWalk(env, value);
3967 JVM_END
3968
3969 /*
3970 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3971 */
3972 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3973 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3974 JVM_END