1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassInitializer.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "cds/classListParser.hpp"
28 #include "cds/classListWriter.hpp"
29 #include "cds/dynamicArchive.hpp"
30 #include "cds/heapShared.hpp"
31 #include "cds/lambdaFormInvokers.hpp"
32 #include "cds/lambdaProxyClassDictionary.hpp"
33 #include "classfile/classFileStream.hpp"
34 #include "classfile/classLoader.inline.hpp"
35 #include "classfile/classLoaderData.hpp"
36 #include "classfile/classLoaderData.inline.hpp"
37 #include "classfile/classLoadInfo.hpp"
38 #include "classfile/javaAssertions.hpp"
39 #include "classfile/javaClasses.inline.hpp"
40 #include "classfile/moduleEntry.hpp"
41 #include "classfile/modules.hpp"
42 #include "classfile/packageEntry.hpp"
43 #include "classfile/stringTable.hpp"
44 #include "classfile/symbolTable.hpp"
45 #include "classfile/systemDictionary.hpp"
46 #include "classfile/vmClasses.hpp"
47 #include "classfile/vmSymbols.hpp"
48 #include "gc/shared/collectedHeap.inline.hpp"
49 #include "interpreter/bytecode.hpp"
50 #include "interpreter/bytecodeUtils.hpp"
51 #include "jfr/jfrEvents.hpp"
52 #include "jvm.h"
53 #include "logging/log.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/referenceType.hpp"
56 #include "memory/resourceArea.hpp"
57 #include "memory/universe.hpp"
58 #include "oops/access.inline.hpp"
59 #include "oops/constantPool.hpp"
60 #include "oops/fieldStreams.inline.hpp"
61 #include "oops/flatArrayKlass.hpp"
62 #include "oops/instanceKlass.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/method.hpp"
65 #include "oops/recordComponent.hpp"
66 #include "oops/objArrayKlass.hpp"
67 #include "oops/objArrayOop.inline.hpp"
68 #include "oops/oop.inline.hpp"
69 #include "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/atomic.hpp"
77 #include "runtime/continuation.hpp"
78 #include "runtime/globals_extension.hpp"
79 #include "runtime/handles.inline.hpp"
80 #include "runtime/init.hpp"
81 #include "runtime/interfaceSupport.inline.hpp"
82 #include "runtime/deoptimization.hpp"
83 #include "runtime/handshake.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/vmOperations.hpp"
98 #include "runtime/vm_version.hpp"
99 #include "services/attachListener.hpp"
100 #include "services/management.hpp"
101 #include "services/threadService.hpp"
102 #include "utilities/checkedCast.hpp"
103 #include "utilities/copy.hpp"
104 #include "utilities/defaultStream.hpp"
105 #include "utilities/dtrace.hpp"
106 #include "utilities/events.hpp"
107 #include "utilities/macros.hpp"
108 #include "utilities/utf8.hpp"
109 #include "utilities/zipLibrary.hpp"
110 #if INCLUDE_CDS
111 #include "classfile/systemDictionaryShared.hpp"
112 #endif
113 #if INCLUDE_JFR
114 #include "jfr/jfr.hpp"
115 #endif
116 #if INCLUDE_MANAGEMENT
117 #include "services/finalizerService.hpp"
118 #endif
119 #ifdef LINUX
120 #include "osContainer_linux.hpp"
121 #endif
122
123 #include <errno.h>
124
125 /*
126 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
127 such ctors and calls MUST NOT come between an oop declaration/init and its
128 usage because if objects are move this may cause various memory stomps, bus
129 errors and segfaults. Here is a cookbook for causing so called "naked oop
130 failures":
131
132 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
133 // Object address to be held directly in mirror & not visible to GC
134 oop mirror = JNIHandles::resolve_non_null(ofClass);
135
136 // If this ctor can hit a safepoint, moving objects around, then
137 ComplexConstructor foo;
138
139 // Boom! mirror may point to JUNK instead of the intended object
140 (some dereference of mirror)
141
142 // Here's another call that may block for GC, making mirror stale
143 MutexLocker ml(some_lock);
144
145 // And here's an initializer that can result in a stale oop
146 // all in one step.
147 oop o = call_that_can_throw_exception(TRAPS);
148
149
150 The solution is to keep the oop declaration BELOW the ctor or function
151 call that might cause a GC, do another resolve to reassign the oop, or
152 consider use of a Handle instead of an oop so there is immunity from object
153 motion. But note that the "QUICK" entries below do not have a handlemark
154 and thus can only support use of handles passed in.
155 */
156
157 extern void trace_class_resolution(Klass* to_class) {
158 ResourceMark rm;
159 int line_number = -1;
160 const char * source_file = nullptr;
161 const char * trace = "explicit";
162 InstanceKlass* caller = nullptr;
163 JavaThread* jthread = JavaThread::current();
164 if (jthread->has_last_Java_frame()) {
165 vframeStream vfst(jthread);
166
167 // Scan up the stack skipping ClassLoader frames.
168 Method* last_caller = nullptr;
169
170 while (!vfst.at_end()) {
171 Method* m = vfst.method();
172 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
173 break;
174 }
175 last_caller = m;
176 vfst.next();
177 }
178 // if this is called from Class.forName0 and that is called from Class.forName,
179 // then print the caller of Class.forName. If this is Class.loadClass, then print
180 // that caller, otherwise keep quiet since this should be picked up elsewhere.
181 bool found_it = false;
182 if (!vfst.at_end() &&
183 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
184 vfst.method()->name() == vmSymbols::forName0_name()) {
185 vfst.next();
186 if (!vfst.at_end() &&
187 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
188 vfst.method()->name() == vmSymbols::forName_name()) {
189 vfst.next();
190 found_it = true;
191 }
192 } else if (last_caller != nullptr &&
193 last_caller->method_holder()->name() ==
194 vmSymbols::java_lang_ClassLoader() &&
195 last_caller->name() == vmSymbols::loadClass_name()) {
196 found_it = true;
197 } else if (!vfst.at_end()) {
198 if (vfst.method()->is_native()) {
199 // JNI call
200 found_it = true;
201 }
202 }
203 if (found_it && !vfst.at_end()) {
204 // found the caller
205 caller = vfst.method()->method_holder();
206 line_number = vfst.method()->line_number_from_bci(vfst.bci());
207 if (line_number == -1) {
208 // show method name if it's a native method
209 trace = vfst.method()->name_and_sig_as_C_string();
210 }
211 Symbol* s = caller->source_file_name();
212 if (s != nullptr) {
213 source_file = s->as_C_string();
214 }
215 }
216 }
217 if (caller != nullptr) {
218 if (to_class != caller) {
219 const char * from = caller->external_name();
220 const char * to = to_class->external_name();
221 // print in a single call to reduce interleaving between threads
222 if (source_file != nullptr) {
223 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
224 } else {
225 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
226 }
227 }
228 }
229 }
230
231 // java.lang.System //////////////////////////////////////////////////////////////////////
232
233
234 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
235 return os::javaTimeMillis();
236 JVM_END
237
238 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
239 return os::javaTimeNanos();
240 JVM_END
241
242 // The function below is actually exposed by jdk.internal.misc.VM and not
243 // java.lang.System, but we choose to keep it here so that it stays next
244 // to JVM_CurrentTimeMillis and JVM_NanoTime
245
246 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
247 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
248
249 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
250 jlong seconds;
251 jlong nanos;
252
253 os::javaTimeSystemUTC(seconds, nanos);
254
255 // We're going to verify that the result can fit in a long.
256 // For that we need the difference in seconds between 'seconds'
257 // and 'offset_secs' to be such that:
258 // |seconds - offset_secs| < (2^63/10^9)
259 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
260 // which makes |seconds - offset_secs| < 2^33
261 // and we will prefer +/- 2^32 as the maximum acceptable diff
262 // as 2^32 has a more natural feel than 2^33...
263 //
264 // So if |seconds - offset_secs| >= 2^32 - we return a special
265 // sentinel value (-1) which the caller should take as an
266 // exception value indicating that the offset given to us is
267 // too far from range of the current time - leading to too big
268 // a nano adjustment. The caller is expected to recover by
269 // computing a more accurate offset and calling this method
270 // again. (For the record 2^32 secs is ~136 years, so that
271 // should rarely happen)
272 //
273 jlong diff = seconds - offset_secs;
274 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
275 return -1; // sentinel value: the offset is too far off the target
276 }
277
278 // return the adjustment. If you compute a time by adding
279 // this number of nanoseconds along with the number of seconds
280 // in the offset you should get the current UTC time.
281 return (diff * (jlong)1000000000) + nanos;
282 JVM_END
283
284 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
285 jobject dst, jint dst_pos, jint length))
286 // Check if we have null pointers
287 if (src == nullptr || dst == nullptr) {
288 THROW(vmSymbols::java_lang_NullPointerException());
289 }
290 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
291 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
292 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
293 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
294 // Do copy
295 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
296 JVM_END
297
298
299 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
300 JavaValue r(T_OBJECT);
301 // public synchronized Object put(Object key, Object value);
302 HandleMark hm(THREAD);
303 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
304 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
305 JavaCalls::call_virtual(&r,
306 props,
307 vmClasses::Properties_klass(),
308 vmSymbols::put_name(),
309 vmSymbols::object_object_object_signature(),
310 key_str,
311 value_str,
312 THREAD);
313 }
314
315
316 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
317
318 /*
319 * Return all of the system properties in a Java String array with alternating
320 * names and values from the jvm SystemProperty.
321 * Which includes some internal and all commandline -D defined properties.
322 */
323 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
324 ResourceMark rm(THREAD);
325 HandleMark hm(THREAD);
326 int ndx = 0;
327 int fixedCount = 2;
328
329 SystemProperty* p = Arguments::system_properties();
330 int count = Arguments::PropertyList_count(p);
331
332 // Allocate result String array
333 InstanceKlass* ik = vmClasses::String_klass();
334 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
335 objArrayHandle result_h(THREAD, r);
336
337 while (p != nullptr) {
338 const char * key = p->key();
339 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
340 const char * value = p->value();
341 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
342 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
343 result_h->obj_at_put(ndx * 2, key_str());
344 result_h->obj_at_put(ndx * 2 + 1, value_str());
345 ndx++;
346 }
347 p = p->next();
348 }
349
350 // Convert the -XX:MaxDirectMemorySize= command line flag
351 // to the sun.nio.MaxDirectMemorySize property.
352 // Do this after setting user properties to prevent people
353 // from setting the value with a -D option, as requested.
354 // Leave empty if not supplied
355 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
356 char as_chars[256];
357 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
358 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
359 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
360 result_h->obj_at_put(ndx * 2, key_str());
361 result_h->obj_at_put(ndx * 2 + 1, value_str());
362 ndx++;
363 }
364
365 // JVM monitoring and management support
366 // Add the sun.management.compiler property for the compiler's name
367 {
368 #undef CSIZE
369 #if defined(_LP64)
370 #define CSIZE "64-Bit "
371 #else
372 #define CSIZE
373 #endif // 64bit
374
375 #if COMPILER1_AND_COMPILER2
376 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
377 #else
378 #if defined(COMPILER1)
379 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
380 #elif defined(COMPILER2)
381 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
382 #elif INCLUDE_JVMCI
383 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
384 #else
385 const char* compiler_name = "";
386 #endif // compilers
387 #endif // COMPILER1_AND_COMPILER2
388
389 if (*compiler_name != '\0' &&
390 (Arguments::mode() != Arguments::_int)) {
391 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
392 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
393 result_h->obj_at_put(ndx * 2, key_str());
394 result_h->obj_at_put(ndx * 2 + 1, value_str());
395 ndx++;
396 }
397 }
398
399 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
400 JVM_END
401
402
403 /*
404 * Return the temporary directory that the VM uses for the attach
405 * and perf data files.
406 *
407 * It is important that this directory is well-known and the
408 * same for all VM instances. It cannot be affected by configuration
409 * variables such as java.io.tmpdir.
410 */
411 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
412 HandleMark hm(THREAD);
413 const char* temp_dir = os::get_temp_directory();
414 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
415 return (jstring) JNIHandles::make_local(THREAD, h());
416 JVM_END
417
418 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
419 if (len < 0) {
420 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
421 }
422 elmClass->initialize(CHECK);
423 if (elmClass->is_array_klass() || elmClass->is_identity_class()) {
424 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
425 }
426 if (elmClass->is_abstract()) {
427 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
428 }
429 }
430
431 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
432 oop o = JNIHandles::resolve_non_null(orig);
433 assert(o->is_array(), "Must be");
434 oop array = nullptr;
435 arrayOop org = (arrayOop)o;
436 arrayHandle oh(THREAD, org);
437 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass());
438 InlineKlass* vk = InlineKlass::cast(ak->element_klass());
439 int len = to - from; // length of the new array
440 if (ak->is_null_free_array_klass()) {
441 if ((len != 0) && (from >= org->length() || to > org->length())) {
442 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
443 }
444 }
445 if (org->is_flatArray()) {
446 FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass());
447 LayoutKind lk = fak->layout_kind();
448 ArrayKlass::ArrayProperties props = ArrayKlass::ArrayProperties::DEFAULT;
449 switch(lk) {
450 case LayoutKind::ATOMIC_FLAT:
451 props = ArrayKlass::ArrayProperties::NULL_RESTRICTED;
452 break;
453 case LayoutKind::NON_ATOMIC_FLAT:
454 props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED | ArrayKlass::ArrayProperties::NON_ATOMIC);
455 break;
456 case LayoutKind::NULLABLE_ATOMIC_FLAT:
457 props = ArrayKlass::ArrayProperties::NON_ATOMIC;
458 break;
459 default:
460 ShouldNotReachHere();
461 }
462 array = oopFactory::new_flatArray(vk, len, props, lk, CHECK_NULL);
463 arrayHandle ah(THREAD, (arrayOop)array);
464 int end = to < oh()->length() ? to : oh()->length();
465 for (int i = from; i < end; i++) {
466 void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper());
467 void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper());
468 vk->copy_payload_to_addr(src, dst, lk, false);
469 }
470 array = ah();
471 } else {
472 ArrayKlass::ArrayProperties props = org->is_null_free_array() ? ArrayKlass::ArrayProperties::NULL_RESTRICTED : ArrayKlass::ArrayProperties::DEFAULT;
473 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL);
474 int end = to < oh()->length() ? to : oh()->length();
475 for (int i = from; i < end; i++) {
476 if (i < ((objArrayOop)oh())->length()) {
477 ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i));
478 } else {
479 assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
480 ((objArrayOop)array)->obj_at_put(i - from, nullptr);
481 }
482 }
483 }
484 return (jarray) JNIHandles::make_local(THREAD, array);
485 JVM_END
486
487 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
488 oop mirror = JNIHandles::resolve_non_null(elmClass);
489 oop init = JNIHandles::resolve(initVal);
490 if (init == nullptr) {
491 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
492 }
493 Handle init_h(THREAD, init);
494 Klass* klass = java_lang_Class::as_Klass(mirror);
495 if (klass != init_h()->klass()) {
496 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
497 }
498 validate_array_arguments(klass, len, CHECK_NULL);
499 InlineKlass* vk = InlineKlass::cast(klass);
500 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NON_ATOMIC | ArrayKlass::ArrayProperties::NULL_RESTRICTED);
501 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
502 for (int i = 0; i < len; i++) {
503 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
504 }
505 return (jarray) JNIHandles::make_local(THREAD, array);
506 JVM_END
507
508 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
509 oop mirror = JNIHandles::resolve_non_null(elmClass);
510 oop init = JNIHandles::resolve(initVal);
511 if (init == nullptr) {
512 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
513 }
514 Handle init_h(THREAD, init);
515 Klass* klass = java_lang_Class::as_Klass(mirror);
516 if (klass != init_h()->klass()) {
517 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
518 }
519 validate_array_arguments(klass, len, CHECK_NULL);
520 InlineKlass* vk = InlineKlass::cast(klass);
521 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED);
522 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
523 for (int i = 0; i < len; i++) {
524 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
525 }
526 return (jarray) JNIHandles::make_local(THREAD, array);
527 JVM_END
528
529 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
530 oop mirror = JNIHandles::resolve_non_null(elmClass);
531 Klass* klass = java_lang_Class::as_Klass(mirror);
532 klass->initialize(CHECK_NULL);
533 validate_array_arguments(klass, len, CHECK_NULL);
534 InlineKlass* vk = InlineKlass::cast(klass);
535 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::DEFAULT);
536 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
537 return (jarray) JNIHandles::make_local(THREAD, array);
538 JVM_END
539
540 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
541 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
542 return oop->is_flatArray();
543 JVM_END
544
545 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
546 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
547 return oop->is_null_free_array();
548 JVM_END
549
550 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
551 // There are multiple cases where an array can/must support atomic access:
552 // - the array is a reference array
553 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or ATOMIC_FLAT
554 // - the array is flat and its component type is naturally atomic
555 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
556 if (oop->is_refArray()) return true;
557 if (oop->is_flatArray()) {
558 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
559 if (fak->layout_kind() == LayoutKind::ATOMIC_FLAT || fak->layout_kind() == LayoutKind::NULLABLE_ATOMIC_FLAT) {
560 return true;
561 }
562 if (fak->element_klass()->is_naturally_atomic()) return true;
563 }
564 return false;
565 JVM_END
566
567 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
568
569 extern volatile jint vm_created;
570
571 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
572 EventShutdown event;
573 if (event.should_commit()) {
574 event.set_reason("Shutdown requested from Java");
575 event.commit();
576 }
577 JVM_END
578
579
580 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
581 before_exit(thread, true);
582 vm_exit(code);
583 JVM_END
584
585
586 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
587 if (!DisableExplicitGC) {
588 EventSystemGC event;
589 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
590 Universe::heap()->collect(GCCause::_java_lang_system_gc);
591 event.commit();
592 }
593 JVM_END
594
595
596 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
597 return Universe::heap()->millis_since_last_whole_heap_examined();
598 JVM_END
599
600
601 static inline jlong convert_size_t_to_jlong(size_t val) {
602 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
603 NOT_LP64 (return (jlong)val;)
604 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
605 }
606
607 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
608 size_t n = Universe::heap()->capacity();
609 return convert_size_t_to_jlong(n);
610 JVM_END
611
612
613 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
614 size_t n = Universe::heap()->unused();
615 return convert_size_t_to_jlong(n);
616 JVM_END
617
618
619 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
620 size_t n = Universe::heap()->max_capacity();
621 return convert_size_t_to_jlong(n);
622 JVM_END
623
624
625 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
626 return os::active_processor_count();
627 JVM_END
628
629 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
630 #ifdef LINUX
631 if (UseContainerSupport) {
632 return JNI_TRUE;
633 }
634 #endif
635 return JNI_FALSE;
636 JVM_END
637
638 JVM_LEAF(jboolean, JVM_IsContainerized(void))
639 #ifdef LINUX
640 if (OSContainer::is_containerized()) {
641 return JNI_TRUE;
642 }
643 #endif
644 return JNI_FALSE;
645 JVM_END
646
647 // java.lang.Throwable //////////////////////////////////////////////////////
648
649 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
650 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
651 java_lang_Throwable::fill_in_stack_trace(exception);
652 JVM_END
653
654 // java.lang.NullPointerException ///////////////////////////////////////////
655
656 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
657 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
658
659 oop exc = JNIHandles::resolve_non_null(throwable);
660
661 Method* method;
662 int bci;
663 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
664 return nullptr;
665 }
666 if (method->is_native()) {
667 return nullptr;
668 }
669
670 stringStream ss;
671 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
672 if (ok) {
673 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
674 return (jstring) JNIHandles::make_local(THREAD, result);
675 } else {
676 return nullptr;
677 }
678 JVM_END
679
680 // java.lang.StackTraceElement //////////////////////////////////////////////
681
682
683 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
684 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
685 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
686 objArrayHandle stack_trace(THREAD, st);
687 // Fill in the allocated stack trace
688 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
689 JVM_END
690
691
692 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
693 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
694 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
695 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
696 JVM_END
697
698
699 // java.lang.StackWalker //////////////////////////////////////////////////////
700 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
701 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
702
703 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
704 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
705 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
706 if (!have_name) {
707 oop name = StringTable::intern(method->name(), CHECK);
708 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
709 }
710 if (!have_type) {
711 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
712 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
713 }
714 JVM_END
715
716 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
717 jint skip_frames, jobject contScope, jobject cont,
718 jint buffer_size, jint start_index, jobjectArray frames))
719 if (!thread->has_last_Java_frame()) {
720 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
721 }
722
723 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
724 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
725 Handle cont_h(THREAD, JNIHandles::resolve(cont));
726 // frames array is a ClassFrameInfo[] array when only getting caller reference,
727 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
728 // be null.
729 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
730 objArrayHandle frames_array_h(THREAD, fa);
731
732 if (frames_array_h->length() < buffer_size) {
733 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
734 }
735
736 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
737 buffer_size, start_index, frames_array_h, CHECK_NULL);
738 return JNIHandles::make_local(THREAD, result);
739 JVM_END
740
741
742 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
743 jint last_batch_count, jint buffer_size, jint start_index,
744 jobjectArray frames))
745 // frames array is a ClassFrameInfo[] array when only getting caller reference,
746 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
747 // be null.
748 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
749 objArrayHandle frames_array_h(THREAD, fa);
750
751 if (frames_array_h->length() < buffer_size) {
752 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
753 }
754
755 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
756 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
757 start_index, frames_array_h, THREAD);
758 JVM_END
759
760 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
761 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
762 objArrayHandle frames_array_h(THREAD, fa);
763 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
764 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
765
766 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
767 JVM_END
768
769 // java.lang.Object ///////////////////////////////////////////////
770
771
772 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
773 // as implemented in the classic virtual machine; return 0 if object is null
774 if (handle == nullptr) {
775 return 0;
776 }
777 oop obj = JNIHandles::resolve_non_null(handle);
778 if (EnableValhalla && obj->klass()->is_inline_klass()) {
779 JavaValue result(T_INT);
780 JavaCallArguments args;
781 Handle ho(THREAD, obj);
782 args.push_oop(ho);
783 methodHandle method(THREAD, Universe::value_object_hash_code_method());
784 JavaCalls::call(&result, method, &args, THREAD);
785 if (HAS_PENDING_EXCEPTION) {
786 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
787 Handle e(THREAD, PENDING_EXCEPTION);
788 CLEAR_PENDING_EXCEPTION;
789 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
790 }
791 }
792 return result.get_jint();
793 } else {
794 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
795 }
796 JVM_END
797
798
799 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
800 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
801 ObjectSynchronizer::wait(obj, ms, CHECK);
802 JVM_END
803
804
805 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
806 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
807 ObjectSynchronizer::notify(obj, CHECK);
808 JVM_END
809
810
811 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
812 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
813 ObjectSynchronizer::notifyall(obj, CHECK);
814 JVM_END
815
816
817 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
818 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
819 Klass* klass = obj->klass();
820 JvmtiVMObjectAllocEventCollector oam;
821
822 #ifdef ASSERT
823 // Just checking that the cloneable flag is set correct
824 if (obj->is_array()) {
825 guarantee(klass->is_cloneable(), "all arrays are cloneable");
826 } else {
827 guarantee(obj->is_instance(), "should be instanceOop");
828 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
829 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
830 }
831 #endif
832
833 // Check if class of obj supports the Cloneable interface.
834 // All arrays are considered to be cloneable (See JLS 20.1.5).
835 // All j.l.r.Reference classes are considered non-cloneable.
836 if (!klass->is_cloneable() ||
837 (klass->is_instance_klass() &&
838 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
839 ResourceMark rm(THREAD);
840 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
841 }
842
843 if (klass->is_inline_klass()) {
844 // Value instances have no identity, so return the current instance instead of allocating a new one
845 // Value classes cannot have finalizers, so the method can return immediately
846 return JNIHandles::make_local(THREAD, obj());
847 }
848
849 // Make shallow object copy
850 const size_t size = obj->size();
851 oop new_obj_oop = nullptr;
852 if (obj->is_array()) {
853 const int length = ((arrayOop)obj())->length();
854 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
855 /* do_zero */ true, CHECK_NULL);
856 } else {
857 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
858 }
859
860 HeapAccess<>::clone(obj(), new_obj_oop, size);
861
862 Handle new_obj(THREAD, new_obj_oop);
863 // Caution: this involves a java upcall, so the clone should be
864 // "gc-robust" by this stage.
865 if (klass->has_finalizer()) {
866 assert(obj->is_instance(), "should be instanceOop");
867 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
868 new_obj = Handle(THREAD, new_obj_oop);
869 }
870
871 return JNIHandles::make_local(THREAD, new_obj());
872 JVM_END
873
874 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
875
876 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
877 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
878 JVM_END
879
880 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
881 return InstanceKlass::is_finalization_enabled();
882 JVM_END
883
884 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
885
886 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
887 CONT_RegisterNativeMethods(env, cls);
888 JVM_END
889
890 // java.io.File ///////////////////////////////////////////////////////////////
891
892 JVM_LEAF(char*, JVM_NativePath(char* path))
893 return os::native_path(path);
894 JVM_END
895
896
897 // Misc. class handling ///////////////////////////////////////////////////////////
898
899
900 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
901 // Getting the class of the caller frame.
902 //
903 // The call stack at this point looks something like this:
904 //
905 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
906 // [1] [ @CallerSensitive API.method ]
907 // [.] [ (skipped intermediate frames) ]
908 // [n] [ caller ]
909 vframeStream vfst(thread);
910 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
911 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
912 Method* m = vfst.method();
913 assert(m != nullptr, "sanity");
914 switch (n) {
915 case 0:
916 // This must only be called from Reflection.getCallerClass
917 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
918 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
919 }
920 // fall-through
921 case 1:
922 // Frame 0 and 1 must be caller sensitive.
923 if (!m->caller_sensitive()) {
924 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
925 }
926 break;
927 default:
928 if (!m->is_ignored_by_security_stack_walk()) {
929 // We have reached the desired frame; return the holder class.
930 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
931 }
932 break;
933 }
934 }
935 return nullptr;
936 JVM_END
937
938
939 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
940 oop mirror = nullptr;
941 BasicType t = name2type(utf);
942 if (t != T_ILLEGAL && !is_reference_type(t)) {
943 mirror = Universe::java_mirror(t);
944 }
945 if (mirror == nullptr) {
946 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
947 } else {
948 return (jclass) JNIHandles::make_local(THREAD, mirror);
949 }
950 JVM_END
951
952
953 // Returns a class loaded by the bootstrap class loader; or null
954 // if not found. ClassNotFoundException is not thrown.
955 // FindClassFromBootLoader is exported to the launcher for windows.
956 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
957 const char* name))
958 // Java libraries should ensure that name is never null or illegal.
959 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
960 // It's impossible to create this class; the name cannot fit
961 // into the constant pool.
962 return nullptr;
963 }
964 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
965
966 TempNewSymbol h_name = SymbolTable::new_symbol(name);
967 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
968 if (k == nullptr) {
969 return nullptr;
970 }
971
972 if (log_is_enabled(Debug, class, resolve)) {
973 trace_class_resolution(k);
974 }
975 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
976 JVM_END
977
978 // Find a class with this name in this loader, using the caller's protection domain.
979 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
980 jboolean init, jobject loader,
981 jclass caller))
982 TempNewSymbol h_name =
983 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
984 CHECK_NULL);
985
986 oop loader_oop = JNIHandles::resolve(loader);
987 oop from_class = JNIHandles::resolve(caller);
988 Handle h_loader(THREAD, loader_oop);
989
990 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
991 false, THREAD);
992
993 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
994 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
995 }
996 return result;
997 JVM_END
998
999 // Currently only called from the old verifier.
1000 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1001 jboolean init, jclass from))
1002 TempNewSymbol h_name =
1003 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1004 CHECK_NULL);
1005 oop from_class_oop = JNIHandles::resolve(from);
1006 Klass* from_class = (from_class_oop == nullptr)
1007 ? (Klass*)nullptr
1008 : java_lang_Class::as_Klass(from_class_oop);
1009 oop class_loader = nullptr;
1010 if (from_class != nullptr) {
1011 class_loader = from_class->class_loader();
1012 }
1013 Handle h_loader(THREAD, class_loader);
1014 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1015
1016 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1017 // this function is generally only used for class loading during verification.
1018 ResourceMark rm;
1019 oop from_mirror = JNIHandles::resolve_non_null(from);
1020 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
1021 const char * from_name = from_class->external_name();
1022
1023 oop mirror = JNIHandles::resolve_non_null(result);
1024 Klass* to_class = java_lang_Class::as_Klass(mirror);
1025 const char * to = to_class->external_name();
1026 log_debug(class, resolve)("%s %s (verification)", from_name, to);
1027 }
1028
1029 return result;
1030 JVM_END
1031
1032 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1033 static jclass jvm_define_class_common(const char *name,
1034 jobject loader, const jbyte *buf,
1035 jsize len, jobject pd, const char *source,
1036 TRAPS) {
1037 if (source == nullptr) source = "__JVM_DefineClass__";
1038
1039 JavaThread* jt = THREAD;
1040
1041 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1042 ClassLoader::perf_define_appclass_selftime(),
1043 ClassLoader::perf_define_appclasses(),
1044 jt->get_thread_stat()->perf_recursion_counts_addr(),
1045 jt->get_thread_stat()->perf_timers_addr(),
1046 PerfClassTraceTime::DEFINE_CLASS);
1047
1048 if (UsePerfData) {
1049 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1050 }
1051
1052 // Class resolution will get the class name from the .class stream if the name is null.
1053 TempNewSymbol class_name = name == nullptr ? nullptr :
1054 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1055 CHECK_NULL);
1056
1057 ResourceMark rm(THREAD);
1058 ClassFileStream st((u1*)buf, len, source);
1059 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1060 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1061 ClassLoadInfo cl_info(protection_domain);
1062 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1063 class_loader,
1064 cl_info,
1065 CHECK_NULL);
1066
1067 if (log_is_enabled(Debug, class, resolve)) {
1068 trace_class_resolution(k);
1069 }
1070
1071 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1072 }
1073
1074 enum {
1075 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1076 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1077 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1078 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1079 };
1080
1081 /*
1082 * Define a class with the specified flags that indicates if it's a nestmate,
1083 * hidden, or strongly referenced from class loader.
1084 */
1085 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1086 const jbyte *buf, jsize len, jobject pd,
1087 jboolean init, int flags, jobject classData, TRAPS) {
1088 ResourceMark rm(THREAD);
1089
1090 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
1091 // Lookup class must be a non-null instance
1092 if (lookup_k == nullptr) {
1093 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1094 }
1095 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
1096
1097 Handle class_loader (THREAD, lookup_k->class_loader());
1098
1099 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1100 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1101 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1102 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1103
1104 InstanceKlass* host_class = nullptr;
1105 if (is_nestmate) {
1106 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1107 }
1108
1109 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1110 name,
1111 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1112 is_nestmate ? host_class->external_name() : "",
1113 is_hidden ? "hidden" : "not hidden",
1114 is_strong ? "strong" : "weak",
1115 vm_annotations ? "with vm annotations" : "without vm annotation");
1116
1117 if (!is_hidden) {
1118 // classData is only applicable for hidden classes
1119 if (classData != nullptr) {
1120 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1121 }
1122 if (is_nestmate) {
1123 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1124 }
1125 if (!is_strong) {
1126 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1127 }
1128 if (vm_annotations) {
1129 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1130 }
1131 if (flags != STRONG_LOADER_LINK) {
1132 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1133 err_msg("invalid flag 0x%x", flags));
1134 }
1135 }
1136
1137 // Class resolution will get the class name from the .class stream if the name is null.
1138 TempNewSymbol class_name = name == nullptr ? nullptr :
1139 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1140 CHECK_NULL);
1141
1142 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1143 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1144 ClassFileStream st((u1*)buf, len, source);
1145
1146 InstanceKlass* ik = nullptr;
1147 if (!is_hidden) {
1148 ClassLoadInfo cl_info(protection_domain);
1149 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1150 class_loader,
1151 cl_info,
1152 CHECK_NULL);
1153
1154 if (log_is_enabled(Debug, class, resolve)) {
1155 trace_class_resolution(ik);
1156 }
1157 } else { // hidden
1158 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1159 ClassLoadInfo cl_info(protection_domain,
1160 host_class,
1161 classData_h,
1162 is_hidden,
1163 is_strong,
1164 vm_annotations);
1165 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1166 class_loader,
1167 cl_info,
1168 CHECK_NULL);
1169
1170 // The hidden class loader data has been artificially been kept alive to
1171 // this point. The mirror and any instances of this class have to keep
1172 // it alive afterwards.
1173 ik->class_loader_data()->dec_keep_alive_ref_count();
1174
1175 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1176 ModuleEntry* module = ik->module();
1177 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1178 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1179 module_name,
1180 ik->external_name(),
1181 host_class->external_name(),
1182 ik->is_hidden() ? "is hidden" : "is not hidden");
1183 }
1184 }
1185
1186 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1187 // non-hidden class or nestmate class must be in the same package as the Lookup class
1188 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1189 }
1190
1191 if (init) {
1192 ik->initialize(CHECK_NULL);
1193 } else {
1194 ik->link_class(CHECK_NULL);
1195 }
1196
1197 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1198 }
1199
1200 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1201 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1202 JVM_END
1203
1204 /*
1205 * Define a class with the specified lookup class.
1206 * lookup: Lookup class
1207 * name: the name of the class
1208 * buf: class bytes
1209 * len: length of class bytes
1210 * pd: protection domain
1211 * init: initialize the class
1212 * flags: properties of the class
1213 * classData: private static pre-initialized field
1214 */
1215 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1216 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1217
1218 if (lookup == nullptr) {
1219 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1220 }
1221
1222 assert(buf != nullptr, "buf must not be null");
1223
1224 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1225 JVM_END
1226
1227 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1228
1229 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1230 JVM_END
1231
1232 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1233 ResourceMark rm(THREAD);
1234
1235 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1236 char* str = java_lang_String::as_utf8_string(h_name());
1237
1238 // Sanity check, don't expect null
1239 if (str == nullptr) return nullptr;
1240
1241 // Internalize the string, converting '.' to '/' in string.
1242 char* p = (char*)str;
1243 while (*p != '\0') {
1244 if (*p == '.') {
1245 *p = '/';
1246 }
1247 p++;
1248 }
1249
1250 const int str_len = (int)(p - str);
1251 if (str_len > Symbol::max_length()) {
1252 // It's impossible to create this class; the name cannot fit
1253 // into the constant pool.
1254 return nullptr;
1255 }
1256 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1257
1258 // Security Note:
1259 // The Java level wrapper will perform the necessary security check allowing
1260 // us to pass the null as the initiating class loader.
1261 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1262 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1263 #if INCLUDE_CDS
1264 if (k == nullptr) {
1265 // If the class is not already loaded, try to see if it's in the shared
1266 // archive for the current classloader (h_loader).
1267 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1268 }
1269 #endif
1270 return (k == nullptr) ? nullptr :
1271 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1272 JVM_END
1273
1274 // Module support //////////////////////////////////////////////////////////////////////////////
1275
1276 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1277 jstring location, jobjectArray packages))
1278 Handle h_module (THREAD, JNIHandles::resolve(module));
1279 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1280 JVM_END
1281
1282 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1283 Handle h_module (THREAD, JNIHandles::resolve(module));
1284 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1285 JVM_END
1286
1287 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1288 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1289 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1290 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1291 JVM_END
1292
1293 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1294 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1295 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1296 JVM_END
1297
1298 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1299 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1300 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1301 JVM_END
1302
1303 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1304 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1305 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1306 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1307 JVM_END
1308
1309 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1310 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1311 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1312 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1313 JVM_END
1314
1315 // Reflection support //////////////////////////////////////////////////////////////////////////////
1316
1317 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1318 assert (cls != nullptr, "illegal class");
1319 JvmtiVMObjectAllocEventCollector oam;
1320 ResourceMark rm(THREAD);
1321 HandleMark hm(THREAD);
1322 Handle java_class(THREAD, JNIHandles::resolve(cls));
1323 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1324 return (jstring) JNIHandles::make_local(THREAD, result);
1325 JVM_END
1326
1327
1328 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1329 JvmtiVMObjectAllocEventCollector oam;
1330 oop mirror = JNIHandles::resolve_non_null(cls);
1331
1332 // Special handling for primitive objects
1333 if (java_lang_Class::is_primitive(mirror)) {
1334 // Primitive objects does not have any interfaces
1335 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1336 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1337 }
1338
1339 Klass* klass = java_lang_Class::as_Klass(mirror);
1340 // Figure size of result array
1341 int size;
1342 if (klass->is_instance_klass()) {
1343 InstanceKlass* ik = InstanceKlass::cast(klass);
1344 size = ik->local_interfaces()->length();
1345 } else {
1346 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1347 size = 2;
1348 }
1349
1350 // Allocate result array
1351 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1352 objArrayHandle result (THREAD, r);
1353 // Fill in result
1354 if (klass->is_instance_klass()) {
1355 // Regular instance klass, fill in all local interfaces
1356 for (int index = 0; index < size; index++) {
1357 InstanceKlass* ik = InstanceKlass::cast(klass);
1358 Klass* k = ik->local_interfaces()->at(index);
1359 result->obj_at_put(index, k->java_mirror());
1360 }
1361 } else {
1362 // All arrays implement java.lang.Cloneable and java.io.Serializable
1363 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1364 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1365 }
1366 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1367 JVM_END
1368
1369
1370 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1371 oop mirror = JNIHandles::resolve_non_null(cls);
1372 if (java_lang_Class::is_primitive(mirror)) {
1373 return JNI_FALSE;
1374 }
1375 Klass* k = java_lang_Class::as_Klass(mirror);
1376 return k->is_hidden();
1377 JVM_END
1378
1379 class ScopedValueBindingsResolver {
1380 public:
1381 InstanceKlass* Carrier_klass;
1382 ScopedValueBindingsResolver(JavaThread* THREAD) {
1383 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1384 Carrier_klass = InstanceKlass::cast(k);
1385 }
1386 };
1387
1388 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1389 ResourceMark rm(THREAD);
1390 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1391 JvmtiVMObjectAllocEventCollector oam;
1392
1393 static ScopedValueBindingsResolver resolver(THREAD);
1394
1395 // Iterate through Java frames
1396 vframeStream vfst(thread);
1397 for(; !vfst.at_end(); vfst.next()) {
1398 int loc = -1;
1399 // get method of frame
1400 Method* method = vfst.method();
1401
1402 Symbol *name = method->name();
1403
1404 InstanceKlass* holder = method->method_holder();
1405 if (name == vmSymbols::runWith_method_name()) {
1406 if (holder == vmClasses::Thread_klass()
1407 || holder == resolver.Carrier_klass) {
1408 loc = 1;
1409 }
1410 }
1411
1412 if (loc != -1) {
1413 javaVFrame *frame = vfst.asJavaVFrame();
1414 StackValueCollection* locals = frame->locals();
1415 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1416 Handle result = head_sv->get_obj();
1417 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1418 if (result() != nullptr) {
1419 return JNIHandles::make_local(THREAD, result());
1420 }
1421 }
1422 }
1423
1424 return nullptr;
1425 JVM_END
1426
1427 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1428 JvmtiVMObjectAllocEventCollector oam;
1429 // ofClass is a reference to a java_lang_Class object. The mirror object
1430 // of an InstanceKlass
1431 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1432 if (java_lang_Class::is_primitive(ofMirror) ||
1433 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1434 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1435 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1436 }
1437
1438 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1439 InnerClassesIterator iter(k);
1440
1441 if (iter.length() == 0) {
1442 // Neither an inner nor outer class
1443 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1444 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1445 }
1446
1447 // find inner class info
1448 constantPoolHandle cp(thread, k->constants());
1449 int length = iter.length();
1450
1451 // Allocate temp. result array
1452 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1453 objArrayHandle result (THREAD, r);
1454 int members = 0;
1455
1456 for (; !iter.done(); iter.next()) {
1457 int ioff = iter.inner_class_info_index();
1458 int ooff = iter.outer_class_info_index();
1459
1460 if (ioff != 0 && ooff != 0) {
1461 // Check to see if the name matches the class we're looking for
1462 // before attempting to find the class.
1463 if (cp->klass_name_at_matches(k, ooff)) {
1464 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1465 if (outer_klass == k) {
1466 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1467 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1468
1469 // Throws an exception if outer klass has not declared k as
1470 // an inner klass
1471 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1472
1473 result->obj_at_put(members, inner_klass->java_mirror());
1474 members++;
1475 }
1476 }
1477 }
1478 }
1479
1480 if (members != length) {
1481 // Return array of right length
1482 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1483 for(int i = 0; i < members; i++) {
1484 res->obj_at_put(i, result->obj_at(i));
1485 }
1486 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1487 }
1488
1489 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1490 JVM_END
1491
1492
1493 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1494 {
1495 // ofClass is a reference to a java_lang_Class object.
1496 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1497 if (java_lang_Class::is_primitive(ofMirror)) {
1498 return nullptr;
1499 }
1500 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1501 if (!klass->is_instance_klass()) {
1502 return nullptr;
1503 }
1504
1505 bool inner_is_member = false;
1506 Klass* outer_klass
1507 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1508 if (outer_klass == nullptr) return nullptr; // already a top-level class
1509 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1510 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1511 }
1512 JVM_END
1513
1514 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1515 {
1516 oop mirror = JNIHandles::resolve_non_null(cls);
1517 if (java_lang_Class::is_primitive(mirror)) {
1518 return nullptr;
1519 }
1520 Klass* klass = java_lang_Class::as_Klass(mirror);
1521 if (!klass->is_instance_klass()) {
1522 return nullptr;
1523 }
1524 InstanceKlass* k = InstanceKlass::cast(klass);
1525 int ooff = 0, noff = 0;
1526 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1527 if (noff != 0) {
1528 constantPoolHandle i_cp(thread, k->constants());
1529 Symbol* name = i_cp->symbol_at(noff);
1530 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1531 return (jstring) JNIHandles::make_local(THREAD, str());
1532 }
1533 }
1534 return nullptr;
1535 }
1536 JVM_END
1537
1538 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1539 assert (cls != nullptr, "illegal class");
1540 JvmtiVMObjectAllocEventCollector oam;
1541 ResourceMark rm(THREAD);
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 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1548 if (sym == nullptr) return nullptr;
1549 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1550 return (jstring) JNIHandles::make_local(THREAD, str());
1551 }
1552 }
1553 return nullptr;
1554 JVM_END
1555
1556
1557 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1558 assert (cls != nullptr, "illegal class");
1559 oop mirror = JNIHandles::resolve_non_null(cls);
1560 // Return null for arrays and primitives
1561 if (!java_lang_Class::is_primitive(mirror)) {
1562 Klass* k = java_lang_Class::as_Klass(mirror);
1563 if (k->is_instance_klass()) {
1564 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1565 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1566 }
1567 }
1568 return nullptr;
1569 JVM_END
1570
1571
1572 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1573 // some of this code was adapted from from jni_FromReflectedField
1574
1575 oop reflected = JNIHandles::resolve_non_null(field);
1576 oop mirror = java_lang_reflect_Field::clazz(reflected);
1577 Klass* k = java_lang_Class::as_Klass(mirror);
1578 int slot = java_lang_reflect_Field::slot(reflected);
1579 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1580
1581 InstanceKlass* ik = InstanceKlass::cast(k);
1582 int offset = ik->field_offset(slot);
1583
1584 if (modifiers & JVM_ACC_STATIC) {
1585 // for static fields we only look in the current class
1586 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1587 assert(false, "cannot find static field");
1588 return false;
1589 }
1590 } else {
1591 // for instance fields we start with the current class and work
1592 // our way up through the superclass chain
1593 if (!ik->find_field_from_offset(offset, false, &fd)) {
1594 assert(false, "cannot find instance field");
1595 return false;
1596 }
1597 }
1598 return true;
1599 }
1600
1601 static Method* jvm_get_method_common(jobject method) {
1602 // some of this code was adapted from from jni_FromReflectedMethod
1603
1604 oop reflected = JNIHandles::resolve_non_null(method);
1605 oop mirror = nullptr;
1606 int slot = 0;
1607
1608 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1609 mirror = java_lang_reflect_Constructor::clazz(reflected);
1610 slot = java_lang_reflect_Constructor::slot(reflected);
1611 } else {
1612 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1613 "wrong type");
1614 mirror = java_lang_reflect_Method::clazz(reflected);
1615 slot = java_lang_reflect_Method::slot(reflected);
1616 }
1617 Klass* k = java_lang_Class::as_Klass(mirror);
1618
1619 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1620 assert(m != nullptr, "cannot find method");
1621 return m; // caller has to deal with null in product mode
1622 }
1623
1624 /* Type use annotations support (JDK 1.8) */
1625
1626 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1627 assert (cls != nullptr, "illegal class");
1628 ResourceMark rm(THREAD);
1629 // Return null for arrays and primitives
1630 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1631 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1632 if (k->is_instance_klass()) {
1633 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1634 if (type_annotations != nullptr) {
1635 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1636 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1637 }
1638 }
1639 }
1640 return nullptr;
1641 JVM_END
1642
1643 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1644 assert (method != nullptr, "illegal method");
1645 // method is a handle to a java.lang.reflect.Method object
1646 Method* m = jvm_get_method_common(method);
1647 if (m == nullptr) {
1648 return nullptr;
1649 }
1650
1651 AnnotationArray* type_annotations = m->type_annotations();
1652 if (type_annotations != nullptr) {
1653 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1654 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1655 }
1656
1657 return nullptr;
1658 JVM_END
1659
1660 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1661 assert (field != nullptr, "illegal field");
1662 fieldDescriptor fd;
1663 bool gotFd = jvm_get_field_common(field, fd);
1664 if (!gotFd) {
1665 return nullptr;
1666 }
1667
1668 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1669 JVM_END
1670
1671 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1672 if (!cp->is_within_bounds(index)) {
1673 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1674 }
1675 }
1676
1677 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1678 {
1679 // method is a handle to a java.lang.reflect.Method object
1680 Method* method_ptr = jvm_get_method_common(method);
1681 methodHandle mh (THREAD, method_ptr);
1682 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1683 const int num_params = mh->method_parameters_length();
1684
1685 if (num_params < 0) {
1686 // A -1 return value from method_parameters_length means there is no
1687 // parameter data. Return null to indicate this to the reflection
1688 // API.
1689 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1690 return (jobjectArray)nullptr;
1691 } else {
1692 // Otherwise, we return something up to reflection, even if it is
1693 // a zero-length array. Why? Because in some cases this can
1694 // trigger a MalformedParametersException.
1695
1696 // make sure all the symbols are properly formatted
1697 for (int i = 0; i < num_params; i++) {
1698 MethodParametersElement* params = mh->method_parameters_start();
1699 int index = params[i].name_cp_index;
1700 constantPoolHandle cp(THREAD, mh->constants());
1701 bounds_check(cp, index, CHECK_NULL);
1702
1703 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1704 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1705 "Wrong type at constant pool index");
1706 }
1707
1708 }
1709
1710 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1711 objArrayHandle result (THREAD, result_oop);
1712
1713 for (int i = 0; i < num_params; i++) {
1714 MethodParametersElement* params = mh->method_parameters_start();
1715 // For a 0 index, give a null symbol
1716 Symbol* sym = 0 != params[i].name_cp_index ?
1717 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1718 int flags = params[i].flags;
1719 oop param = Reflection::new_parameter(reflected_method, i, sym,
1720 flags, CHECK_NULL);
1721 result->obj_at_put(i, param);
1722 }
1723 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1724 }
1725 }
1726 JVM_END
1727
1728 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1729
1730 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1731 {
1732 JvmtiVMObjectAllocEventCollector oam;
1733
1734 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1735 // Exclude primitive types and array types
1736 if (java_lang_Class::is_primitive(ofMirror) ||
1737 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1738 // Return empty array
1739 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1740 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1741 }
1742
1743 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1744 constantPoolHandle cp(THREAD, k->constants());
1745
1746 // Ensure class is linked
1747 k->link_class(CHECK_NULL);
1748
1749 // Allocate result
1750 int num_fields;
1751
1752 if (publicOnly) {
1753 num_fields = 0;
1754 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1755 if (fs.access_flags().is_public()) ++num_fields;
1756 }
1757 } else {
1758 num_fields = k->java_fields_count();
1759 }
1760
1761 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1762 objArrayHandle result (THREAD, r);
1763
1764 int out_idx = 0;
1765 fieldDescriptor fd;
1766 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1767 if (!publicOnly || fs.access_flags().is_public()) {
1768 fd.reinitialize(k, fs.to_FieldInfo());
1769 oop field = Reflection::new_field(&fd, CHECK_NULL);
1770 result->obj_at_put(out_idx, field);
1771 ++out_idx;
1772 }
1773 }
1774 assert(out_idx == num_fields, "just checking");
1775 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1776 }
1777 JVM_END
1778
1779 // A class is a record if and only if it is final and a direct subclass of
1780 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1781 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1782 {
1783 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1784 if (k != nullptr && k->is_instance_klass()) {
1785 InstanceKlass* ik = InstanceKlass::cast(k);
1786 return ik->is_record();
1787 } else {
1788 return false;
1789 }
1790 }
1791 JVM_END
1792
1793 // Returns an array containing the components of the Record attribute,
1794 // or null if the attribute is not present.
1795 //
1796 // Note that this function returns the components of the Record attribute
1797 // even if the class is not a record.
1798 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1799 {
1800 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1801 assert(c->is_instance_klass(), "must be");
1802 InstanceKlass* ik = InstanceKlass::cast(c);
1803
1804 Array<RecordComponent*>* components = ik->record_components();
1805 if (components != nullptr) {
1806 JvmtiVMObjectAllocEventCollector oam;
1807 constantPoolHandle cp(THREAD, ik->constants());
1808 int length = components->length();
1809 assert(length >= 0, "unexpected record_components length");
1810 objArrayOop record_components =
1811 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1812 objArrayHandle components_h (THREAD, record_components);
1813
1814 for (int x = 0; x < length; x++) {
1815 RecordComponent* component = components->at(x);
1816 assert(component != nullptr, "unexpected null record component");
1817 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1818 components_h->obj_at_put(x, component_oop);
1819 }
1820 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1821 }
1822
1823 return nullptr;
1824 }
1825 JVM_END
1826
1827 static jobjectArray get_class_declared_methods_helper(
1828 JNIEnv *env,
1829 jclass ofClass, jboolean publicOnly,
1830 bool want_constructor,
1831 Klass* klass, TRAPS) {
1832
1833 JvmtiVMObjectAllocEventCollector oam;
1834
1835 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1836 // Exclude primitive types and array types
1837 if (java_lang_Class::is_primitive(ofMirror)
1838 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1839 // Return empty array
1840 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1841 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1842 }
1843
1844 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1845
1846 // Ensure class is linked
1847 k->link_class(CHECK_NULL);
1848
1849 Array<Method*>* methods = k->methods();
1850 int methods_length = methods->length();
1851
1852 // Save original method_idnum in case of redefinition, which can change
1853 // the idnum of obsolete methods. The new method will have the same idnum
1854 // but if we refresh the methods array, the counts will be wrong.
1855 ResourceMark rm(THREAD);
1856 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1857 int num_methods = 0;
1858
1859 // Select methods matching the criteria.
1860 for (int i = 0; i < methods_length; i++) {
1861 Method* method = methods->at(i);
1862 if (want_constructor && !method->is_object_constructor()) {
1863 continue;
1864 }
1865 if (!want_constructor &&
1866 (method->is_object_constructor() || method->is_class_initializer() ||
1867 method->is_overpass())) {
1868 continue;
1869 }
1870 if (publicOnly && !method->is_public()) {
1871 continue;
1872 }
1873 idnums->push(method->method_idnum());
1874 ++num_methods;
1875 }
1876
1877 // Allocate result
1878 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1879 objArrayHandle result (THREAD, r);
1880
1881 // Now just put the methods that we selected above, but go by their idnum
1882 // in case of redefinition. The methods can be redefined at any safepoint,
1883 // so above when allocating the oop array and below when creating reflect
1884 // objects.
1885 for (int i = 0; i < num_methods; i++) {
1886 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1887 if (method.is_null()) {
1888 // Method may have been deleted and seems this API can handle null
1889 // Otherwise should probably put a method that throws NSME
1890 result->obj_at_put(i, nullptr);
1891 } else {
1892 oop m;
1893 if (want_constructor) {
1894 assert(method->is_object_constructor(), "must be");
1895 m = Reflection::new_constructor(method, CHECK_NULL);
1896 } else {
1897 m = Reflection::new_method(method, false, CHECK_NULL);
1898 }
1899 result->obj_at_put(i, m);
1900 }
1901 }
1902
1903 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1904 }
1905
1906 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1907 {
1908 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1909 /*want_constructor*/ false,
1910 vmClasses::reflect_Method_klass(), THREAD);
1911 }
1912 JVM_END
1913
1914 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1915 {
1916 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1917 /*want_constructor*/ true,
1918 vmClasses::reflect_Constructor_klass(), THREAD);
1919 }
1920 JVM_END
1921
1922 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1923 {
1924 oop mirror = JNIHandles::resolve_non_null(cls);
1925 if (java_lang_Class::is_primitive(mirror)) {
1926 // Primitive type
1927 return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1928 }
1929
1930 Klass* k = java_lang_Class::as_Klass(mirror);
1931 return k->access_flags().as_class_flags();
1932 }
1933 JVM_END
1934
1935 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1936 {
1937 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1938 assert(c->is_instance_klass(), "must be");
1939 InstanceKlass* ck = InstanceKlass::cast(c);
1940 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1941 assert(m->is_instance_klass(), "must be");
1942 InstanceKlass* mk = InstanceKlass::cast(m);
1943 return ck->has_nestmate_access_to(mk, THREAD);
1944 }
1945 JVM_END
1946
1947 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1948 {
1949 // current is not a primitive or array class
1950 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1951 assert(c->is_instance_klass(), "must be");
1952 InstanceKlass* ck = InstanceKlass::cast(c);
1953 InstanceKlass* host = ck->nest_host(THREAD);
1954 return (jclass) (host == nullptr ? nullptr :
1955 JNIHandles::make_local(THREAD, host->java_mirror()));
1956 }
1957 JVM_END
1958
1959 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1960 {
1961 // current is not a primitive or array class
1962 ResourceMark rm(THREAD);
1963 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1964 assert(c->is_instance_klass(), "must be");
1965 InstanceKlass* ck = InstanceKlass::cast(c);
1966 InstanceKlass* host = ck->nest_host(THREAD);
1967
1968 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1969 ck->external_name(), host->external_name());
1970 {
1971 JvmtiVMObjectAllocEventCollector oam;
1972 Array<u2>* members = host->nest_members();
1973 int length = members == nullptr ? 0 : members->length();
1974
1975 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1976
1977 // nest host is first in the array so make it one bigger
1978 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1979 length + 1, CHECK_NULL);
1980 objArrayHandle result(THREAD, r);
1981 result->obj_at_put(0, host->java_mirror());
1982 if (length != 0) {
1983 int count = 0;
1984 for (int i = 0; i < length; i++) {
1985 int cp_index = members->at(i);
1986 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1987 if (HAS_PENDING_EXCEPTION) {
1988 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1989 return nullptr; // propagate VMEs
1990 }
1991 if (log_is_enabled(Trace, class, nestmates)) {
1992 stringStream ss;
1993 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1994 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1995 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1996 log_trace(class, nestmates)("%s", ss.as_string());
1997 }
1998 CLEAR_PENDING_EXCEPTION;
1999 continue;
2000 }
2001 if (k->is_instance_klass()) {
2002 InstanceKlass* ik = InstanceKlass::cast(k);
2003 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2004 if (nest_host_k == host) {
2005 result->obj_at_put(count+1, k->java_mirror());
2006 count++;
2007 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2008 } else {
2009 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2010 ik->external_name(), nest_host_k->external_name());
2011 }
2012 } else {
2013 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2014 k->external_name());
2015 }
2016 }
2017 if (count < length) {
2018 // we had invalid entries so we need to compact the array
2019 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2020 length + 1, count + 1);
2021
2022 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2023 count + 1, CHECK_NULL);
2024 objArrayHandle result2(THREAD, r2);
2025 for (int i = 0; i < count + 1; i++) {
2026 result2->obj_at_put(i, result->obj_at(i));
2027 }
2028 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2029 }
2030 }
2031 else {
2032 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2033 }
2034 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2035 }
2036 }
2037 JVM_END
2038
2039 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2040 {
2041 oop mirror = JNIHandles::resolve_non_null(current);
2042 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2043 Klass* c = java_lang_Class::as_Klass(mirror);
2044 assert(c->is_instance_klass(), "must be");
2045 InstanceKlass* ik = InstanceKlass::cast(c);
2046 ResourceMark rm(THREAD);
2047 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2048 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2049 if (ik->is_sealed()) {
2050 JvmtiVMObjectAllocEventCollector oam;
2051 Array<u2>* subclasses = ik->permitted_subclasses();
2052 int length = subclasses->length();
2053
2054 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2055
2056 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2057 length, CHECK_NULL);
2058 objArrayHandle result(THREAD, r);
2059 int count = 0;
2060 for (int i = 0; i < length; i++) {
2061 int cp_index = subclasses->at(i);
2062 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2063 if (HAS_PENDING_EXCEPTION) {
2064 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2065 return nullptr; // propagate VMEs
2066 }
2067 if (log_is_enabled(Trace, class, sealed)) {
2068 stringStream ss;
2069 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2070 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2071 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2072 log_trace(class, sealed)("%s", ss.as_string());
2073 }
2074
2075 CLEAR_PENDING_EXCEPTION;
2076 continue;
2077 }
2078 if (k->is_instance_klass()) {
2079 result->obj_at_put(count++, k->java_mirror());
2080 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2081 }
2082 }
2083 if (count < length) {
2084 // we had invalid entries so we need to compact the array
2085 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2086 count, CHECK_NULL);
2087 objArrayHandle result2(THREAD, r2);
2088 for (int i = 0; i < count; i++) {
2089 result2->obj_at_put(i, result->obj_at(i));
2090 }
2091 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2092 }
2093 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2094 } else {
2095 return nullptr;
2096 }
2097 }
2098 JVM_END
2099
2100 // Constant pool access //////////////////////////////////////////////////////////
2101
2102 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2103 {
2104 JvmtiVMObjectAllocEventCollector oam;
2105 oop mirror = JNIHandles::resolve_non_null(cls);
2106 // Return null for primitives and arrays
2107 if (!java_lang_Class::is_primitive(mirror)) {
2108 Klass* k = java_lang_Class::as_Klass(mirror);
2109 if (k->is_instance_klass()) {
2110 InstanceKlass* k_h = InstanceKlass::cast(k);
2111 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2112 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2113 return JNIHandles::make_local(THREAD, jcp());
2114 }
2115 }
2116 return nullptr;
2117 }
2118 JVM_END
2119
2120
2121 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2122 {
2123 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2124 return cp->length();
2125 }
2126 JVM_END
2127
2128
2129 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2130 {
2131 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2132 bounds_check(cp, index, CHECK_NULL);
2133 constantTag tag = cp->tag_at(index);
2134 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2135 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2136 }
2137 Klass* k = cp->klass_at(index, CHECK_NULL);
2138 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2139 }
2140 JVM_END
2141
2142 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2143 {
2144 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2145 bounds_check(cp, index, CHECK_NULL);
2146 constantTag tag = cp->tag_at(index);
2147 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2148 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2149 }
2150 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2151 if (k == nullptr) return nullptr;
2152 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2153 }
2154 JVM_END
2155
2156 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2157 constantTag tag = cp->tag_at(index);
2158 if (!tag.is_method() && !tag.is_interface_method()) {
2159 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2160 }
2161 int klass_ref = cp->uncached_klass_ref_index_at(index);
2162 Klass* k_o;
2163 if (force_resolution) {
2164 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2165 } else {
2166 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2167 if (k_o == nullptr) return nullptr;
2168 }
2169 InstanceKlass* k = InstanceKlass::cast(k_o);
2170 Symbol* name = cp->uncached_name_ref_at(index);
2171 Symbol* sig = cp->uncached_signature_ref_at(index);
2172 methodHandle m (THREAD, k->find_method(name, sig));
2173 if (m.is_null()) {
2174 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2175 }
2176 oop method;
2177 if (m->is_object_constructor()) {
2178 method = Reflection::new_constructor(m, CHECK_NULL);
2179 } else {
2180 method = Reflection::new_method(m, true, CHECK_NULL);
2181 }
2182 return JNIHandles::make_local(THREAD, method);
2183 }
2184
2185 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2186 {
2187 JvmtiVMObjectAllocEventCollector oam;
2188 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2189 bounds_check(cp, index, CHECK_NULL);
2190 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2191 return res;
2192 }
2193 JVM_END
2194
2195 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2196 {
2197 JvmtiVMObjectAllocEventCollector oam;
2198 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2199 bounds_check(cp, index, CHECK_NULL);
2200 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2201 return res;
2202 }
2203 JVM_END
2204
2205 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2206 constantTag tag = cp->tag_at(index);
2207 if (!tag.is_field()) {
2208 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2209 }
2210 int klass_ref = cp->uncached_klass_ref_index_at(index);
2211 Klass* k_o;
2212 if (force_resolution) {
2213 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2214 } else {
2215 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2216 if (k_o == nullptr) return nullptr;
2217 }
2218 InstanceKlass* k = InstanceKlass::cast(k_o);
2219 Symbol* name = cp->uncached_name_ref_at(index);
2220 Symbol* sig = cp->uncached_signature_ref_at(index);
2221 fieldDescriptor fd;
2222 Klass* target_klass = k->find_field(name, sig, &fd);
2223 if (target_klass == nullptr) {
2224 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2225 }
2226 oop field = Reflection::new_field(&fd, CHECK_NULL);
2227 return JNIHandles::make_local(THREAD, field);
2228 }
2229
2230 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2231 {
2232 JvmtiVMObjectAllocEventCollector oam;
2233 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2234 bounds_check(cp, index, CHECK_NULL);
2235 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2236 return res;
2237 }
2238 JVM_END
2239
2240 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2241 {
2242 JvmtiVMObjectAllocEventCollector oam;
2243 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2244 bounds_check(cp, index, CHECK_NULL);
2245 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2246 return res;
2247 }
2248 JVM_END
2249
2250 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2251 {
2252 JvmtiVMObjectAllocEventCollector oam;
2253 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2254 bounds_check(cp, index, CHECK_NULL);
2255 constantTag tag = cp->tag_at(index);
2256 if (!tag.is_field_or_method()) {
2257 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2258 }
2259 int klass_ref = cp->uncached_klass_ref_index_at(index);
2260 Symbol* klass_name = cp->klass_name_at(klass_ref);
2261 Symbol* member_name = cp->uncached_name_ref_at(index);
2262 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2263 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2264 objArrayHandle dest(THREAD, dest_o);
2265 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2266 dest->obj_at_put(0, str());
2267 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2268 dest->obj_at_put(1, str());
2269 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2270 dest->obj_at_put(2, str());
2271 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2272 }
2273 JVM_END
2274
2275 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2276 {
2277 JvmtiVMObjectAllocEventCollector oam;
2278 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2279 bounds_check(cp, index, CHECK_0);
2280 constantTag tag = cp->tag_at(index);
2281 if (!tag.is_field_or_method()) {
2282 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2283 }
2284 return (jint) cp->uncached_klass_ref_index_at(index);
2285 }
2286 JVM_END
2287
2288 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2289 {
2290 JvmtiVMObjectAllocEventCollector oam;
2291 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2292 bounds_check(cp, index, CHECK_0);
2293 constantTag tag = cp->tag_at(index);
2294 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2295 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2296 }
2297 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2298 }
2299 JVM_END
2300
2301 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2302 {
2303 JvmtiVMObjectAllocEventCollector oam;
2304 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2305 bounds_check(cp, index, CHECK_NULL);
2306 constantTag tag = cp->tag_at(index);
2307 if (!tag.is_name_and_type()) {
2308 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2309 }
2310 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2311 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2312 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2313 objArrayHandle dest(THREAD, dest_o);
2314 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2315 dest->obj_at_put(0, str());
2316 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2317 dest->obj_at_put(1, str());
2318 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2319 }
2320 JVM_END
2321
2322 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2323 {
2324 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2325 bounds_check(cp, index, CHECK_0);
2326 constantTag tag = cp->tag_at(index);
2327 if (!tag.is_int()) {
2328 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2329 }
2330 return cp->int_at(index);
2331 }
2332 JVM_END
2333
2334 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2335 {
2336 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2337 bounds_check(cp, index, CHECK_(0L));
2338 constantTag tag = cp->tag_at(index);
2339 if (!tag.is_long()) {
2340 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2341 }
2342 return cp->long_at(index);
2343 }
2344 JVM_END
2345
2346 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2347 {
2348 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2349 bounds_check(cp, index, CHECK_(0.0f));
2350 constantTag tag = cp->tag_at(index);
2351 if (!tag.is_float()) {
2352 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2353 }
2354 return cp->float_at(index);
2355 }
2356 JVM_END
2357
2358 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2359 {
2360 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2361 bounds_check(cp, index, CHECK_(0.0));
2362 constantTag tag = cp->tag_at(index);
2363 if (!tag.is_double()) {
2364 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2365 }
2366 return cp->double_at(index);
2367 }
2368 JVM_END
2369
2370 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2371 {
2372 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2373 bounds_check(cp, index, CHECK_NULL);
2374 constantTag tag = cp->tag_at(index);
2375 if (!tag.is_string()) {
2376 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2377 }
2378 oop str = cp->string_at(index, CHECK_NULL);
2379 return (jstring) JNIHandles::make_local(THREAD, str);
2380 }
2381 JVM_END
2382
2383 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2384 {
2385 JvmtiVMObjectAllocEventCollector oam;
2386 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2387 bounds_check(cp, index, CHECK_NULL);
2388 constantTag tag = cp->tag_at(index);
2389 if (!tag.is_symbol()) {
2390 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2391 }
2392 Symbol* sym = cp->symbol_at(index);
2393 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2394 return (jstring) JNIHandles::make_local(THREAD, str());
2395 }
2396 JVM_END
2397
2398 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2399 {
2400 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2401 bounds_check(cp, index, CHECK_0);
2402 constantTag tag = cp->tag_at(index);
2403 jbyte result = tag.value();
2404 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2405 // they are changed to the corresponding tags from the JVM spec, so that java code in
2406 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2407 if (tag.is_klass_or_reference()) {
2408 result = JVM_CONSTANT_Class;
2409 } else if (tag.is_string_index()) {
2410 result = JVM_CONSTANT_String;
2411 } else if (tag.is_method_type_in_error()) {
2412 result = JVM_CONSTANT_MethodType;
2413 } else if (tag.is_method_handle_in_error()) {
2414 result = JVM_CONSTANT_MethodHandle;
2415 } else if (tag.is_dynamic_constant_in_error()) {
2416 result = JVM_CONSTANT_Dynamic;
2417 }
2418 return result;
2419 }
2420 JVM_END
2421
2422 // Assertion support. //////////////////////////////////////////////////////////
2423
2424 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2425 assert(cls != nullptr, "bad class");
2426
2427 oop r = JNIHandles::resolve(cls);
2428 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2429 if (java_lang_Class::is_primitive(r)) return false;
2430
2431 Klass* k = java_lang_Class::as_Klass(r);
2432 assert(k->is_instance_klass(), "must be an instance klass");
2433 if (!k->is_instance_klass()) return false;
2434
2435 ResourceMark rm(THREAD);
2436 const char* name = k->name()->as_C_string();
2437 bool system_class = k->class_loader() == nullptr;
2438 return JavaAssertions::enabled(name, system_class);
2439
2440 JVM_END
2441
2442
2443 // Return a new AssertionStatusDirectives object with the fields filled in with
2444 // command-line assertion arguments (i.e., -ea, -da).
2445 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2446 JvmtiVMObjectAllocEventCollector oam;
2447 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2448 return JNIHandles::make_local(THREAD, asd);
2449 JVM_END
2450
2451 // Verification ////////////////////////////////////////////////////////////////////////////////
2452
2453 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2454
2455 // RedefineClasses support: bug 6214132 caused verification to fail.
2456 // All functions from this section should call the jvmtiThreadSate function:
2457 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2458 // The function returns a Klass* of the _scratch_class if the verifier
2459 // was invoked in the middle of the class redefinition.
2460 // Otherwise it returns its argument value which is the _the_class Klass*.
2461 // Please, refer to the description in the jvmtiThreadState.hpp.
2462
2463 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2464 oop mirror = JNIHandles::resolve_non_null(cls);
2465 if (java_lang_Class::is_primitive(mirror)) {
2466 return JNI_FALSE;
2467 }
2468 Klass* k = java_lang_Class::as_Klass(mirror);
2469 // This isn't necessary since answer is the same since redefinition
2470 // has already checked this matches for the scratch class.
2471 // k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2472 jboolean result = k->is_interface();
2473 assert(!result || k->is_instance_klass(),
2474 "all interfaces are instance types");
2475 return result;
2476 JVM_END
2477
2478
2479 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2480 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2481 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2482 return k->name()->as_utf8();
2483 JVM_END
2484
2485
2486 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2487 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2488 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2489 // types will have length zero if this is not an InstanceKlass
2490 // (length is determined by call to JVM_GetClassCPEntriesCount)
2491 if (k->is_instance_klass()) {
2492 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2493 for (int index = cp->length() - 1; index >= 0; index--) {
2494 constantTag tag = cp->tag_at(index);
2495 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2496 }
2497 }
2498 JVM_END
2499
2500
2501 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2502 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2503 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2504 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2505 JVM_END
2506
2507
2508 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2509 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2510 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2511 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2512 JVM_END
2513
2514
2515 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2516 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2517 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2518 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2519 JVM_END
2520
2521
2522 // The following methods, used for the verifier, are never called with
2523 // array klasses, so a direct cast to InstanceKlass is safe.
2524 // Typically, these methods are called in a loop with bounds determined
2525 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2526 // zero for arrays.
2527 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2528 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2529 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2530 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2531 int length = method->checked_exceptions_length();
2532 if (length > 0) {
2533 CheckedExceptionElement* table= method->checked_exceptions_start();
2534 for (int i = 0; i < length; i++) {
2535 exceptions[i] = table[i].class_cp_index;
2536 }
2537 }
2538 JVM_END
2539
2540
2541 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2542 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2543 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2544 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2545 return method->checked_exceptions_length();
2546 JVM_END
2547
2548
2549 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2550 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2551 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2552 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2553 memcpy(code, method->code_base(), method->code_size());
2554 JVM_END
2555
2556
2557 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2558 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2559 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2560 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2561 return method->code_size();
2562 JVM_END
2563
2564
2565 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2566 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2567 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2568 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2569 ExceptionTable extable(method);
2570 entry->start_pc = extable.start_pc(entry_index);
2571 entry->end_pc = extable.end_pc(entry_index);
2572 entry->handler_pc = extable.handler_pc(entry_index);
2573 entry->catchType = extable.catch_type_index(entry_index);
2574 JVM_END
2575
2576
2577 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2578 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2579 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2580 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2581 return method->exception_table_length();
2582 JVM_END
2583
2584
2585 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2586 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2587 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2588 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2589 return method->access_flags().as_method_flags();
2590 JVM_END
2591
2592
2593 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2594 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2595 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2596 return InstanceKlass::cast(k)->field_access_flags(field_index);
2597 JVM_END
2598
2599
2600 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2601 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2602 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2603 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2604 return method->max_locals();
2605 JVM_END
2606
2607
2608 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2609 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2610 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2611 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2612 return method->size_of_parameters();
2613 JVM_END
2614
2615
2616 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2617 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2618 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2619 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2620 return method->verifier_max_stack();
2621 JVM_END
2622
2623
2624 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2625 ResourceMark rm(THREAD);
2626 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2627 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2628 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2629 return method->is_object_constructor();
2630 JVM_END
2631
2632
2633 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2634 ResourceMark rm(THREAD);
2635 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2636 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2637 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2638 return method->is_overpass();
2639 JVM_END
2640
2641 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2642 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2643 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2644 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2645 return method->name()->as_utf8();
2646 JVM_END
2647
2648
2649 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2650 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2651 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2652 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2653 return method->signature()->as_utf8();
2654 JVM_END
2655
2656 /**
2657 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2658 * read entries in the constant pool. Since the old verifier always
2659 * works on a copy of the code, it will not see any rewriting that
2660 * may possibly occur in the middle of verification. So it is important
2661 * that nothing it calls tries to use the cpCache instead of the raw
2662 * constant pool, so we must use cp->uncached_x methods when appropriate.
2663 */
2664 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2665 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2666 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2667 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2668 switch (cp->tag_at(cp_index).value()) {
2669 case JVM_CONSTANT_Fieldref:
2670 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2671 default:
2672 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2673 }
2674 ShouldNotReachHere();
2675 return nullptr;
2676 JVM_END
2677
2678
2679 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2680 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2681 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2682 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2683 switch (cp->tag_at(cp_index).value()) {
2684 case JVM_CONSTANT_InterfaceMethodref:
2685 case JVM_CONSTANT_Methodref:
2686 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2687 default:
2688 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2689 }
2690 ShouldNotReachHere();
2691 return nullptr;
2692 JVM_END
2693
2694
2695 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2696 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2697 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2698 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2699 switch (cp->tag_at(cp_index).value()) {
2700 case JVM_CONSTANT_InterfaceMethodref:
2701 case JVM_CONSTANT_Methodref:
2702 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2703 default:
2704 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2705 }
2706 ShouldNotReachHere();
2707 return nullptr;
2708 JVM_END
2709
2710
2711 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2712 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2713 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2714 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2715 switch (cp->tag_at(cp_index).value()) {
2716 case JVM_CONSTANT_Fieldref:
2717 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2718 default:
2719 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2720 }
2721 ShouldNotReachHere();
2722 return nullptr;
2723 JVM_END
2724
2725
2726 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2727 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2728 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2729 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2730 Symbol* classname = cp->klass_name_at(cp_index);
2731 return classname->as_utf8();
2732 JVM_END
2733
2734
2735 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2736 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2737 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2738 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2739 switch (cp->tag_at(cp_index).value()) {
2740 case JVM_CONSTANT_Fieldref: {
2741 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2742 Symbol* classname = cp->klass_name_at(class_index);
2743 return classname->as_utf8();
2744 }
2745 default:
2746 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2747 }
2748 ShouldNotReachHere();
2749 return nullptr;
2750 JVM_END
2751
2752
2753 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2754 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2755 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2756 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2757 switch (cp->tag_at(cp_index).value()) {
2758 case JVM_CONSTANT_Methodref:
2759 case JVM_CONSTANT_InterfaceMethodref: {
2760 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2761 Symbol* classname = cp->klass_name_at(class_index);
2762 return classname->as_utf8();
2763 }
2764 default:
2765 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2766 }
2767 ShouldNotReachHere();
2768 return nullptr;
2769 JVM_END
2770
2771
2772 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2773 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2774 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2775 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2776 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2777 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2778 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2779 switch (cp->tag_at(cp_index).value()) {
2780 case JVM_CONSTANT_Fieldref: {
2781 Symbol* name = cp->uncached_name_ref_at(cp_index);
2782 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2783 InstanceKlass* ik = InstanceKlass::cast(k_called);
2784 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2785 if (fs.name() == name && fs.signature() == signature) {
2786 return fs.access_flags().as_field_flags();
2787 }
2788 }
2789 return -1;
2790 }
2791 default:
2792 fatal("JVM_GetCPFieldModifiers: illegal constant");
2793 }
2794 ShouldNotReachHere();
2795 return 0;
2796 JVM_END
2797
2798
2799 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2800 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2801 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2802 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2803 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2804 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2805 switch (cp->tag_at(cp_index).value()) {
2806 case JVM_CONSTANT_Methodref:
2807 case JVM_CONSTANT_InterfaceMethodref: {
2808 Symbol* name = cp->uncached_name_ref_at(cp_index);
2809 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2810 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2811 int methods_count = methods->length();
2812 for (int i = 0; i < methods_count; i++) {
2813 Method* method = methods->at(i);
2814 if (method->name() == name && method->signature() == signature) {
2815 return method->access_flags().as_method_flags();
2816 }
2817 }
2818 return -1;
2819 }
2820 default:
2821 fatal("JVM_GetCPMethodModifiers: illegal constant");
2822 }
2823 ShouldNotReachHere();
2824 return 0;
2825 JVM_END
2826
2827
2828 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2829
2830 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2831 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2832 JVM_END
2833
2834
2835 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2836 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2837 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2838 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2839 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2840 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2841 JVM_END
2842
2843 // Printing support //////////////////////////////////////////////////
2844 extern "C" {
2845
2846 ATTRIBUTE_PRINTF(3, 0)
2847 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2848 // Reject count values that are negative signed values converted to
2849 // unsigned; see bug 4399518, 4417214
2850 if ((intptr_t)count <= 0) return -1;
2851
2852 int result = os::vsnprintf(str, count, fmt, args);
2853 if (result > 0 && (size_t)result >= count) {
2854 result = -1;
2855 }
2856
2857 return result;
2858 }
2859
2860 ATTRIBUTE_PRINTF(3, 4)
2861 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2862 va_list args;
2863 int len;
2864 va_start(args, fmt);
2865 len = jio_vsnprintf(str, count, fmt, args);
2866 va_end(args);
2867 return len;
2868 }
2869
2870 ATTRIBUTE_PRINTF(2, 3)
2871 int jio_fprintf(FILE* f, const char *fmt, ...) {
2872 int len;
2873 va_list args;
2874 va_start(args, fmt);
2875 len = jio_vfprintf(f, fmt, args);
2876 va_end(args);
2877 return len;
2878 }
2879
2880 ATTRIBUTE_PRINTF(2, 0)
2881 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2882 if (Arguments::vfprintf_hook() != nullptr) {
2883 return Arguments::vfprintf_hook()(f, fmt, args);
2884 } else {
2885 return vfprintf(f, fmt, args);
2886 }
2887 }
2888
2889 ATTRIBUTE_PRINTF(1, 2)
2890 JNIEXPORT int jio_printf(const char *fmt, ...) {
2891 int len;
2892 va_list args;
2893 va_start(args, fmt);
2894 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2895 va_end(args);
2896 return len;
2897 }
2898
2899 // HotSpot specific jio method
2900 void jio_print(const char* s, size_t len) {
2901 // Try to make this function as atomic as possible.
2902 if (Arguments::vfprintf_hook() != nullptr) {
2903 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2904 } else {
2905 // Make an unused local variable to avoid warning from gcc compiler.
2906 bool dummy = os::write(defaultStream::output_fd(), s, len);
2907 }
2908 }
2909
2910 } // Extern C
2911
2912 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2913
2914 // In most of the JVM thread support functions we need to access the
2915 // thread through a ThreadsListHandle to prevent it from exiting and
2916 // being reclaimed while we try to operate on it. The exceptions to this
2917 // rule are when operating on the current thread, or if the monitor of
2918 // the target java.lang.Thread is locked at the Java level - in both
2919 // cases the target cannot exit.
2920
2921 static void thread_entry(JavaThread* thread, TRAPS) {
2922 HandleMark hm(THREAD);
2923 Handle obj(THREAD, thread->threadObj());
2924 JavaValue result(T_VOID);
2925 JavaCalls::call_virtual(&result,
2926 obj,
2927 vmClasses::Thread_klass(),
2928 vmSymbols::run_method_name(),
2929 vmSymbols::void_method_signature(),
2930 THREAD);
2931 }
2932
2933
2934 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2935 #if INCLUDE_CDS
2936 if (CDSConfig::allow_only_single_java_thread()) {
2937 // During java -Xshare:dump, if we allow multiple Java threads to
2938 // execute in parallel, symbols and classes may be loaded in
2939 // random orders which will make the resulting CDS archive
2940 // non-deterministic.
2941 //
2942 // Lucikly, during java -Xshare:dump, it's important to run only
2943 // the code in the main Java thread (which is NOT started here) that
2944 // creates the module graph, etc. It's safe to not start the other
2945 // threads which are launched by class static initializers
2946 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2947 if (log_is_enabled(Info, aot)) {
2948 ResourceMark rm;
2949 oop t = JNIHandles::resolve_non_null(jthread);
2950 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2951 }
2952 return;
2953 }
2954 #endif
2955 JavaThread *native_thread = nullptr;
2956
2957 // We cannot hold the Threads_lock when we throw an exception,
2958 // due to rank ordering issues. Example: we might need to grab the
2959 // Heap_lock while we construct the exception.
2960 bool throw_illegal_thread_state = false;
2961
2962 // We must release the Threads_lock before we can post a jvmti event
2963 // in Thread::start.
2964 {
2965 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2966 // Ensure that the C++ Thread and OSThread structures aren't freed before
2967 // we operate.
2968 MutexLocker ml(Threads_lock);
2969
2970 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2971 // re-starting an already started thread, so we should usually find
2972 // that the JavaThread is null. However for a JNI attached thread
2973 // there is a small window between the Thread object being created
2974 // (with its JavaThread set) and the update to its threadStatus, so we
2975 // have to check for this
2976 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2977 throw_illegal_thread_state = true;
2978 } else {
2979 jlong size =
2980 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2981 // Allocate the C++ Thread structure and create the native thread. The
2982 // stack size retrieved from java is 64-bit signed, but the constructor takes
2983 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2984 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2985 // - Avoid passing negative values which would result in really large stacks.
2986 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2987 size_t sz = size > 0 ? (size_t) size : 0;
2988 native_thread = new JavaThread(&thread_entry, sz);
2989
2990 // At this point it may be possible that no osthread was created for the
2991 // JavaThread due to lack of memory. Check for this situation and throw
2992 // an exception if necessary. Eventually we may want to change this so
2993 // that we only grab the lock if the thread was created successfully -
2994 // then we can also do this check and throw the exception in the
2995 // JavaThread constructor.
2996 if (native_thread->osthread() != nullptr) {
2997 // Note: the current thread is not being used within "prepare".
2998 native_thread->prepare(jthread);
2999 }
3000 }
3001 }
3002
3003 if (throw_illegal_thread_state) {
3004 THROW(vmSymbols::java_lang_IllegalThreadStateException());
3005 }
3006
3007 assert(native_thread != nullptr, "Starting null thread?");
3008
3009 if (native_thread->osthread() == nullptr) {
3010 ResourceMark rm(thread);
3011 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3012 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3013 // No one should hold a reference to the 'native_thread'.
3014 native_thread->smr_delete();
3015 if (JvmtiExport::should_post_resource_exhausted()) {
3016 JvmtiExport::post_resource_exhausted(
3017 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3018 os::native_thread_creation_failed_msg());
3019 }
3020 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3021 os::native_thread_creation_failed_msg());
3022 }
3023
3024 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3025
3026 Thread::start(native_thread);
3027
3028 JVM_END
3029
3030
3031 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3032 ThreadsListHandle tlh(thread);
3033 oop java_thread = nullptr;
3034 JavaThread* receiver = nullptr;
3035 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3036 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3037
3038 if (is_alive) {
3039 // jthread refers to a live JavaThread.
3040 Thread::set_priority(receiver, (ThreadPriority)prio);
3041 }
3042 // Implied else: If the JavaThread hasn't started yet, then the
3043 // priority set in the java.lang.Thread object above will be pushed
3044 // down when it does start.
3045 JVM_END
3046
3047
3048 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3049 HOTSPOT_THREAD_YIELD();
3050 os::naked_yield();
3051 JVM_END
3052
3053 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3054 if (nanos < 0) {
3055 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3056 }
3057
3058 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3059 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3060 }
3061
3062 // Save current thread state and restore it at the end of this block.
3063 // And set new thread state to SLEEPING.
3064 JavaThreadSleepState jtss(thread);
3065
3066 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3067
3068 if (nanos == 0) {
3069 os::naked_yield();
3070 } else {
3071 ThreadState old_state = thread->osthread()->get_state();
3072 thread->osthread()->set_state(SLEEPING);
3073 if (!thread->sleep_nanos(nanos)) { // interrupted
3074 // An asynchronous exception could have been thrown on
3075 // us while we were sleeping. We do not overwrite those.
3076 if (!HAS_PENDING_EXCEPTION) {
3077 HOTSPOT_THREAD_SLEEP_END(1);
3078
3079 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3080 // to properly restore the thread state. That's likely wrong.
3081 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3082 }
3083 }
3084 thread->osthread()->set_state(old_state);
3085 }
3086 HOTSPOT_THREAD_SLEEP_END(0);
3087 JVM_END
3088
3089 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3090 oop jthread = thread->threadObj();
3091 assert(jthread != nullptr, "no current carrier thread!");
3092 return JNIHandles::make_local(THREAD, jthread);
3093 JVM_END
3094
3095 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3096 oop theThread = thread->vthread();
3097 assert(theThread != (oop)nullptr, "no current thread!");
3098 return JNIHandles::make_local(THREAD, theThread);
3099 JVM_END
3100
3101 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3102 jobject theThread))
3103 oop threadObj = JNIHandles::resolve(theThread);
3104 thread->set_vthread(threadObj);
3105
3106 // Set _monitor_owner_id of new current Thread
3107 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3108
3109 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3110 JVM_END
3111
3112 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3113 return ThreadIdentifier::unsafe_offset();
3114 JVM_END
3115
3116 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3117 ThreadsListHandle tlh(thread);
3118 JavaThread* receiver = nullptr;
3119 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3120 if (is_alive) {
3121 // jthread refers to a live JavaThread.
3122 receiver->interrupt();
3123 }
3124 JVM_END
3125
3126 // Return true iff the current thread has locked the object passed in
3127
3128 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3129 if (obj == nullptr) {
3130 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3131 }
3132 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3133 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3134 JVM_END
3135
3136 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3137 oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3138 return JNIHandles::make_local(THREAD, trace);
3139 JVM_END
3140
3141 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3142 #if INCLUDE_JVMTI
3143 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3144 return JNIHandles::make_local(THREAD, snapshot);
3145 #else
3146 THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
3147 #endif
3148 JVM_END
3149
3150 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3151 // We don't use a ThreadsListHandle here because the current thread
3152 // must be alive.
3153 oop java_thread = JNIHandles::resolve_non_null(jthread);
3154 JavaThread* thr = java_lang_Thread::thread(java_thread);
3155 if (thread == thr && !thr->has_attached_via_jni()) {
3156 // Thread naming is only supported for the current thread and
3157 // we don't set the name of an attached thread to avoid stepping
3158 // on other programs.
3159 ResourceMark rm(thread);
3160 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3161 os::set_native_thread_name(thread_name);
3162 }
3163 JVM_END
3164
3165 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3166 oop theCache = thread->scopedValueCache();
3167 return JNIHandles::make_local(THREAD, theCache);
3168 JVM_END
3169
3170 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3171 jobject theCache))
3172 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3173 thread->set_scopedValueCache(objs);
3174 JVM_END
3175
3176
3177 // java.lang.Package ////////////////////////////////////////////////////////////////
3178
3179
3180 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3181 ResourceMark rm(THREAD);
3182 JvmtiVMObjectAllocEventCollector oam;
3183 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3184 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3185 return (jstring) JNIHandles::make_local(THREAD, result);
3186 JVM_END
3187
3188
3189 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3190 JvmtiVMObjectAllocEventCollector oam;
3191 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3192 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3193 JVM_END
3194
3195
3196 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3197
3198
3199 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3200 MonitorLocker ml(Heap_lock);
3201 oop ref = Universe::reference_pending_list();
3202 if (ref != nullptr) {
3203 Universe::clear_reference_pending_list();
3204 }
3205 return JNIHandles::make_local(THREAD, ref);
3206 JVM_END
3207
3208 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3209 MonitorLocker ml(Heap_lock);
3210 return Universe::has_reference_pending_list();
3211 JVM_END
3212
3213 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3214 MonitorLocker ml(Heap_lock);
3215 while (!Universe::has_reference_pending_list()) {
3216 ml.wait();
3217 }
3218 JVM_END
3219
3220 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3221 oop ref_oop = JNIHandles::resolve_non_null(ref);
3222 // PhantomReference has its own implementation of get().
3223 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3224 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3225 return JNIHandles::make_local(THREAD, referent);
3226 JVM_END
3227
3228 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3229 oop ref_oop = JNIHandles::resolve_non_null(ref);
3230 // PhantomReference has its own implementation of refersTo().
3231 // See: JVM_PhantomReferenceRefersTo
3232 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3233 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3234 return referent == JNIHandles::resolve(o);
3235 JVM_END
3236
3237 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3238 oop ref_oop = JNIHandles::resolve_non_null(ref);
3239 // FinalReference has it's own implementation of clear().
3240 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3241 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3242 // If the referent has already been cleared then done.
3243 // However, if the referent is dead but has not yet been cleared by
3244 // concurrent reference processing, it should NOT be cleared here.
3245 // Instead, clearing should be left to the GC. Clearing it here could
3246 // detectably lose an expected notification, which is impossible with
3247 // STW reference processing. The clearing in enqueue() doesn't have
3248 // this problem, since the enqueue covers the notification, but it's not
3249 // worth the effort to handle that case specially.
3250 return;
3251 }
3252 java_lang_ref_Reference::clear_referent(ref_oop);
3253 JVM_END
3254
3255
3256 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3257
3258
3259 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3260 oop ref_oop = JNIHandles::resolve_non_null(ref);
3261 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3262 return referent == JNIHandles::resolve(o);
3263 JVM_END
3264
3265
3266 // ObjectInputStream ///////////////////////////////////////////////////////////////
3267
3268 // Return the first user-defined class loader up the execution stack, or null
3269 // if only code from the bootstrap or platform class loader is on the stack.
3270
3271 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3272 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3273 InstanceKlass* ik = vfst.method()->method_holder();
3274 oop loader = ik->class_loader();
3275 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3276 return JNIHandles::make_local(THREAD, loader);
3277 }
3278 }
3279 return nullptr;
3280 JVM_END
3281
3282
3283 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3284
3285
3286 // resolve array handle and check arguments
3287 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3288 if (arr == nullptr) {
3289 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3290 }
3291 oop a = JNIHandles::resolve_non_null(arr);
3292 if (!a->is_array()) {
3293 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3294 } else if (type_array_only && !a->is_typeArray()) {
3295 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3296 }
3297 return arrayOop(a);
3298 }
3299
3300
3301 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3302 arrayOop a = check_array(env, arr, false, CHECK_0);
3303 return a->length();
3304 JVM_END
3305
3306
3307 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3308 JvmtiVMObjectAllocEventCollector oam;
3309 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3310 jvalue value;
3311 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3312 oop box = Reflection::box(&value, type, CHECK_NULL);
3313 return JNIHandles::make_local(THREAD, box);
3314 JVM_END
3315
3316
3317 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3318 jvalue value;
3319 value.i = 0; // to initialize value before getting used in CHECK
3320 arrayOop a = check_array(env, arr, true, CHECK_(value));
3321 assert(a->is_typeArray(), "just checking");
3322 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3323 BasicType wide_type = (BasicType) wCode;
3324 if (type != wide_type) {
3325 Reflection::widen(&value, type, wide_type, CHECK_(value));
3326 }
3327 return value;
3328 JVM_END
3329
3330
3331 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3332 arrayOop a = check_array(env, arr, false, CHECK);
3333 oop box = JNIHandles::resolve(val);
3334 jvalue value;
3335 value.i = 0; // to initialize value before getting used in CHECK
3336 BasicType value_type;
3337 if (a->is_objArray()) {
3338 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3339 value_type = Reflection::unbox_for_regular_object(box, &value);
3340 } else {
3341 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3342 }
3343 Reflection::array_set(&value, a, index, value_type, CHECK);
3344 JVM_END
3345
3346
3347 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3348 arrayOop a = check_array(env, arr, true, CHECK);
3349 assert(a->is_typeArray(), "just checking");
3350 BasicType value_type = (BasicType) vCode;
3351 Reflection::array_set(&v, a, index, value_type, CHECK);
3352 JVM_END
3353
3354
3355 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3356 JvmtiVMObjectAllocEventCollector oam;
3357 oop element_mirror = JNIHandles::resolve(eltClass);
3358 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3359 return JNIHandles::make_local(THREAD, result);
3360 JVM_END
3361
3362
3363 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3364 JvmtiVMObjectAllocEventCollector oam;
3365 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3366 oop element_mirror = JNIHandles::resolve(eltClass);
3367 assert(dim_array->is_typeArray(), "just checking");
3368 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3369 return JNIHandles::make_local(THREAD, result);
3370 JVM_END
3371
3372
3373 // Library support ///////////////////////////////////////////////////////////////////////////
3374
3375 JVM_LEAF(void*, JVM_LoadZipLibrary())
3376 return ZipLibrary::handle();
3377 JVM_END
3378
3379 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3380 //%note jvm_ct
3381 char ebuf[1024];
3382 void *load_result;
3383 {
3384 ThreadToNativeFromVM ttnfvm(thread);
3385 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3386 }
3387 if (load_result == nullptr) {
3388 if (throwException) {
3389 char msg[1024];
3390 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3391 // Since 'ebuf' may contain a string encoded using
3392 // platform encoding scheme, we need to pass
3393 // Exceptions::unsafe_to_utf8 to the new_exception method
3394 // as the last argument. See bug 6367357.
3395 Handle h_exception =
3396 Exceptions::new_exception(thread,
3397 vmSymbols::java_lang_UnsatisfiedLinkError(),
3398 msg, Exceptions::unsafe_to_utf8);
3399
3400 THROW_HANDLE_NULL(h_exception);
3401 } else {
3402 log_info(library)("Failed to load library %s", name);
3403 return load_result;
3404 }
3405 }
3406 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3407 return load_result;
3408 JVM_END
3409
3410
3411 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3412 os::dll_unload(handle);
3413 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3414 JVM_END
3415
3416
3417 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3418 void* find_result = os::dll_lookup(handle, name);
3419 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3420 find_result != nullptr ? "Found" : "Failed to find",
3421 name, p2i(handle));
3422 return find_result;
3423 JVM_END
3424
3425
3426 // JNI version ///////////////////////////////////////////////////////////////////////////////
3427
3428 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3429 return Threads::is_supported_jni_version_including_1_1(version);
3430 JVM_END
3431
3432
3433 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3434 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3435 JVM_END
3436
3437 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3438 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3439 JVM_END
3440
3441 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3442 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3443 JVM_END
3444
3445 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3446 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3447 JVM_END
3448
3449 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3450 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3451 JVM_END
3452
3453 // String support ///////////////////////////////////////////////////////////////////////////
3454
3455 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3456 JvmtiVMObjectAllocEventCollector oam;
3457 if (str == nullptr) return nullptr;
3458 oop string = JNIHandles::resolve_non_null(str);
3459 oop result = StringTable::intern(string, CHECK_NULL);
3460 return (jstring) JNIHandles::make_local(THREAD, result);
3461 JVM_END
3462
3463
3464 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3465
3466 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3467 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3468 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3469 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3470 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3471 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3472
3473
3474 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3475 VM_Exit::block_if_vm_exited();
3476 return new PlatformMutex();
3477 }
3478
3479
3480 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3481 VM_Exit::block_if_vm_exited();
3482 delete ((PlatformMutex*) mon);
3483 }
3484
3485
3486 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3487 VM_Exit::block_if_vm_exited();
3488 ((PlatformMutex*) mon)->lock();
3489 return 0;
3490 }
3491
3492
3493 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3494 VM_Exit::block_if_vm_exited();
3495 ((PlatformMutex*) mon)->unlock();
3496 }
3497
3498
3499 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3500
3501 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3502 Handle loader, jboolean throwError, TRAPS) {
3503 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3504
3505 // Check if we should initialize the class
3506 if (init && klass->is_instance_klass()) {
3507 klass->initialize(CHECK_NULL);
3508 }
3509 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3510 }
3511
3512
3513 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3514
3515 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3516 Handle method_handle;
3517 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3518 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3519 Handle receiver(THREAD, JNIHandles::resolve(obj));
3520 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3521 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3522
3523 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3524 jobject res = JNIHandles::make_local(THREAD, result);
3525 if (JvmtiExport::should_post_vm_object_alloc()) {
3526 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3527 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3528 if (java_lang_Class::is_primitive(ret_type)) {
3529 // Only for primitive type vm allocates memory for java object.
3530 // See box() method.
3531 JvmtiExport::post_vm_object_alloc(thread, result);
3532 }
3533 }
3534 return res;
3535 } else {
3536 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3537 }
3538 JVM_END
3539
3540
3541 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3542 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3543 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3544 oop constructor_mirror = JNIHandles::resolve(c);
3545 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3546 jobject res = JNIHandles::make_local(THREAD, result);
3547 if (JvmtiExport::should_post_vm_object_alloc()) {
3548 JvmtiExport::post_vm_object_alloc(thread, result);
3549 }
3550 return res;
3551 JVM_END
3552
3553 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3554 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3555 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3556 JVM_END
3557
3558 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3559 jclass caller,
3560 jstring interfaceMethodName,
3561 jobject factoryType,
3562 jobject interfaceMethodType,
3563 jobject implementationMember,
3564 jobject dynamicMethodType,
3565 jclass lambdaProxyClass))
3566 #if INCLUDE_CDS
3567 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3568 return;
3569 }
3570
3571 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3572 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3573 if (caller_ik->is_hidden()) {
3574 // Hidden classes not of type lambda proxy classes are currently not being archived.
3575 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3576 // registered for archiving.
3577 return;
3578 }
3579 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3580 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3581 assert(lambda_ik->is_hidden(), "must be a hidden class");
3582 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3583
3584 Symbol* interface_method_name = nullptr;
3585 if (interfaceMethodName != nullptr) {
3586 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3587 }
3588 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3589 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3590
3591 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3592 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3593
3594 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3595 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3596 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3597
3598 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3599 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3600
3601 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3602 interface_method_type, m, dynamic_method_type, THREAD);
3603 #endif // INCLUDE_CDS
3604 JVM_END
3605
3606 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3607 jclass caller,
3608 jstring interfaceMethodName,
3609 jobject factoryType,
3610 jobject interfaceMethodType,
3611 jobject implementationMember,
3612 jobject dynamicMethodType))
3613 #if INCLUDE_CDS
3614
3615 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3616 implementationMember == nullptr || dynamicMethodType == nullptr) {
3617 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3618 }
3619
3620 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3621 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3622 if (!caller_ik->is_shared()) {
3623 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3624 return nullptr;
3625 }
3626
3627 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3628 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3629 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3630
3631 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3632 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3633
3634 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3635 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3636 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3637
3638 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3639 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3640
3641 InstanceKlass* loaded_lambda =
3642 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3643 interface_method_type, m, dynamic_method_type,
3644 CHECK_(nullptr));
3645 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3646 #else
3647 return nullptr;
3648 #endif // INCLUDE_CDS
3649 JVM_END
3650
3651 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3652 if (CDSConfig::is_dumping_static_archive()) {
3653 // We do this so that the default CDS archive can be deterministic.
3654 const char* release = VM_Version::vm_release();
3655 const char* dbg_level = VM_Version::jdk_debug_level();
3656 const char* version = VM_Version::internal_vm_info_string();
3657 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3658 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3659 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3660 seed += (jlong)VM_Version::vm_major_version();
3661 seed += (jlong)VM_Version::vm_minor_version();
3662 seed += (jlong)VM_Version::vm_security_version();
3663 seed += (jlong)VM_Version::vm_patch_version();
3664 if (seed == 0) { // don't let this ever be zero.
3665 seed = 0x87654321;
3666 }
3667 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3668 return seed;
3669 } else {
3670 return 0;
3671 }
3672 JVM_END
3673
3674 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3675 return CDSConfig::get_status();
3676 JVM_END
3677
3678 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3679 #if INCLUDE_CDS
3680 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3681 if (line != nullptr) {
3682 ResourceMark rm(THREAD);
3683 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3684 char* c_line = java_lang_String::as_utf8_string(h_line());
3685 if (CDSConfig::is_dumping_dynamic_archive()) {
3686 // Note: LambdaFormInvokers::append take same format which is not
3687 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3688 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3689 }
3690 if (ClassListWriter::is_enabled()) {
3691 ClassListWriter w;
3692 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3693 }
3694 }
3695 #endif // INCLUDE_CDS
3696 JVM_END
3697
3698 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3699 #if INCLUDE_CDS
3700 ResourceMark rm(THREAD);
3701 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3702 char* file_name = java_lang_String::as_utf8_string(file_handle());
3703 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3704 #endif // INCLUDE_CDS
3705 JVM_END
3706
3707 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3708 #if INCLUDE_CDS
3709 ResourceMark rm(THREAD);
3710 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3711 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3712 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3713 #endif // INCLUDE_CDS
3714 JVM_END
3715
3716 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3717 #if INCLUDE_CDS
3718 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3719 if (!k->is_instance_klass()) {
3720 return false;
3721 } else {
3722 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3723 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3724 // This class will be cached in AOT-initialized state. No need for init barriers.
3725 return false;
3726 } else {
3727 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3728 // must emit barriers to ensure class initialization during production run.
3729 ResourceMark rm(THREAD);
3730 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3731 return true;
3732 }
3733 }
3734 #else
3735 return false;
3736 #endif // INCLUDE_CDS
3737 JVM_END
3738
3739 // Returns an array of all live Thread objects (VM internal JavaThreads,
3740 // jvmti agent threads, and JNI attaching threads are skipped)
3741 // See CR 6404306 regarding JNI attaching threads
3742 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3743 ResourceMark rm(THREAD);
3744 ThreadsListEnumerator tle(THREAD, false, false);
3745 JvmtiVMObjectAllocEventCollector oam;
3746
3747 int num_threads = tle.num_threads();
3748 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3749 objArrayHandle threads_ah(THREAD, r);
3750
3751 for (int i = 0; i < num_threads; i++) {
3752 Handle h = tle.get_threadObj(i);
3753 threads_ah->obj_at_put(i, h());
3754 }
3755
3756 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3757 JVM_END
3758
3759
3760 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3761 // Return StackTraceElement[][], each element is the stack trace of a thread in
3762 // the corresponding entry in the given threads array
3763 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3764 JvmtiVMObjectAllocEventCollector oam;
3765
3766 // Check if threads is null
3767 if (threads == nullptr) {
3768 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3769 }
3770
3771 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3772 objArrayHandle ah(THREAD, a);
3773 int num_threads = ah->length();
3774 // check if threads is non-empty array
3775 if (num_threads == 0) {
3776 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3777 }
3778
3779 // check if threads is not an array of objects of Thread class
3780 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3781 if (k != vmClasses::Thread_klass()) {
3782 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3783 }
3784 refArrayHandle rah(THREAD, (refArrayOop)ah()); // j.l.Thread is an identity class, arrays are always reference arrays
3785
3786 ResourceMark rm(THREAD);
3787
3788 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3789 for (int i = 0; i < num_threads; i++) {
3790 oop thread_obj = rah->obj_at(i);
3791 instanceHandle h(THREAD, (instanceOop) thread_obj);
3792 thread_handle_array->append(h);
3793 }
3794
3795 // The JavaThread references in thread_handle_array are validated
3796 // in VM_ThreadDump::doit().
3797 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3798 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3799
3800 JVM_END
3801
3802 // JVM monitoring and management support
3803 JVM_LEAF(void*, JVM_GetManagement(jint version))
3804 return Management::get_jmm_interface(version);
3805 JVM_END
3806
3807 // com.sun.tools.attach.VirtualMachine agent properties support
3808 //
3809 // Initialize the agent properties with the properties maintained in the VM
3810 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3811 ResourceMark rm;
3812
3813 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3814
3815 PUTPROP(props, "sun.java.command", Arguments::java_command());
3816 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3817 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3818 return properties;
3819 JVM_END
3820
3821 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3822 {
3823 JvmtiVMObjectAllocEventCollector oam;
3824
3825 if (ofClass == nullptr) {
3826 return nullptr;
3827 }
3828 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3829 // Special handling for primitive objects
3830 if (java_lang_Class::is_primitive(mirror())) {
3831 return nullptr;
3832 }
3833 Klass* k = java_lang_Class::as_Klass(mirror());
3834 if (!k->is_instance_klass()) {
3835 return nullptr;
3836 }
3837 InstanceKlass* ik = InstanceKlass::cast(k);
3838 int encl_method_class_idx = ik->enclosing_method_class_index();
3839 if (encl_method_class_idx == 0) {
3840 return nullptr;
3841 }
3842 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3843 objArrayHandle dest(THREAD, dest_o);
3844 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3845 dest->obj_at_put(0, enc_k->java_mirror());
3846 int encl_method_method_idx = ik->enclosing_method_method_index();
3847 if (encl_method_method_idx != 0) {
3848 Symbol* sym = ik->constants()->symbol_at(
3849 extract_low_short_from_int(
3850 ik->constants()->name_and_type_at(encl_method_method_idx)));
3851 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3852 dest->obj_at_put(1, str());
3853 sym = ik->constants()->symbol_at(
3854 extract_high_short_from_int(
3855 ik->constants()->name_and_type_at(encl_method_method_idx)));
3856 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3857 dest->obj_at_put(2, str());
3858 }
3859 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3860 }
3861 JVM_END
3862
3863 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3864 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3865 ResourceMark rm(THREAD);
3866
3867 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3868 return nullptr;
3869 }
3870
3871 char** vm_flags = Arguments::jvm_flags_array();
3872 char** vm_args = Arguments::jvm_args_array();
3873 int num_flags = Arguments::num_jvm_flags();
3874 int num_args = Arguments::num_jvm_args();
3875
3876 InstanceKlass* ik = vmClasses::String_klass();
3877 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3878 objArrayHandle result_h(THREAD, r);
3879
3880 int index = 0;
3881 for (int j = 0; j < num_flags; j++, index++) {
3882 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3883 result_h->obj_at_put(index, h());
3884 }
3885 for (int i = 0; i < num_args; i++, index++) {
3886 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3887 result_h->obj_at_put(index, h());
3888 }
3889 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3890 JVM_END
3891
3892 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3893 return os::get_signal_number(name);
3894 JVM_END
3895
3896 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3897 #if INCLUDE_JVMTI
3898 if (!DoJVMTIVirtualThreadTransitions) {
3899 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3900 return;
3901 }
3902 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3903 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3904 } else {
3905 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3906 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3907 }
3908 #endif
3909 JVM_END
3910
3911 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3912 #if INCLUDE_JVMTI
3913 if (!DoJVMTIVirtualThreadTransitions) {
3914 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3915 return;
3916 }
3917 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3918 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3919 } else {
3920 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3921 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3922 }
3923 #endif
3924 JVM_END
3925
3926 // If notifications are disabled then just update the VTMS transition bit and return.
3927 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3928 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3929 #if INCLUDE_JVMTI
3930 if (!DoJVMTIVirtualThreadTransitions) {
3931 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3932 return;
3933 }
3934 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3935 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3936 } else {
3937 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3938 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3939 }
3940 #endif
3941 JVM_END
3942
3943 // If notifications are disabled then just update the VTMS transition bit and return.
3944 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3945 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3946 #if INCLUDE_JVMTI
3947 if (!DoJVMTIVirtualThreadTransitions) {
3948 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3949 return;
3950 }
3951 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3952 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3953 } else {
3954 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3955 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3956 }
3957 #endif
3958 JVM_END
3959
3960 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3961 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3962 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3963 #if INCLUDE_JVMTI
3964 if (!DoJVMTIVirtualThreadTransitions) {
3965 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3966 return;
3967 }
3968 assert(thread->is_disable_suspend() != (bool)enter,
3969 "nested or unbalanced monitor enter/exit is not allowed");
3970 thread->toggle_is_disable_suspend();
3971 #endif
3972 JVM_END
3973
3974 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3975 #if INCLUDE_JFR
3976 freeze_result result = THREAD->last_freeze_fail_result();
3977 assert(result != freeze_ok, "sanity check");
3978 EventVirtualThreadPinned event(UNTIMED);
3979 event.set_starttime(THREAD->last_freeze_fail_time());
3980 if (event.should_commit()) {
3981 ResourceMark rm(THREAD);
3982 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3983 THREAD->post_vthread_pinned_event(&event, str, result);
3984 }
3985 #endif
3986 JVM_END
3987
3988 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3989 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3990 assert(parkEvent != nullptr, "not initialized");
3991
3992 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3993 oop vthread_head = nullptr;
3994 while (true) {
3995 if (list_head.peek() != nullptr) {
3996 for (;;) {
3997 oop head = list_head.resolve();
3998 if (list_head.cmpxchg(head, nullptr) == head) {
3999 return JNIHandles::make_local(THREAD, head);
4000 }
4001 }
4002 }
4003 ThreadBlockInVM tbivm(THREAD);
4004 parkEvent->park();
4005 }
4006 JVM_END
4007 /*
4008 * Return the current class's class file version. The low order 16 bits of the
4009 * returned jint contain the class's major version. The high order 16 bits
4010 * contain the class's minor version.
4011 */
4012 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4013 oop mirror = JNIHandles::resolve_non_null(current);
4014 if (java_lang_Class::is_primitive(mirror)) {
4015 // return latest major version and minor version of 0.
4016 return JVM_CLASSFILE_MAJOR_VERSION;
4017 }
4018 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4019
4020 Klass* c = java_lang_Class::as_Klass(mirror);
4021 assert(c->is_instance_klass(), "must be");
4022 InstanceKlass* ik = InstanceKlass::cast(c);
4023 return (ik->minor_version() << 16) | ik->major_version();
4024 JVM_END
4025
4026 /*
4027 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4028 * get the value will see a materialized value and not a scalar-replaced
4029 * null value.
4030 */
4031 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4032 JVM_EnsureMaterializedForStackWalk(env, value);
4033 JVM_END
4034
4035 /*
4036 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4037 */
4038 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4039 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4040 JVM_END