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.inline.hpp"
36 #include "classfile/classLoadInfo.hpp"
37 #include "classfile/javaAssertions.hpp"
38 #include "classfile/javaClasses.inline.hpp"
39 #include "classfile/moduleEntry.hpp"
40 #include "classfile/modules.hpp"
41 #include "classfile/packageEntry.hpp"
42 #include "classfile/stringTable.hpp"
43 #include "classfile/symbolTable.hpp"
44 #include "classfile/systemDictionary.hpp"
45 #include "classfile/vmClasses.hpp"
46 #include "classfile/vmSymbols.hpp"
47 #include "gc/shared/collectedHeap.inline.hpp"
48 #include "interpreter/bytecode.hpp"
49 #include "interpreter/bytecodeUtils.hpp"
50 #include "jfr/jfrEvents.hpp"
51 #include "jvm.h"
52 #include "logging/log.hpp"
53 #include "memory/oopFactory.hpp"
54 #include "memory/referenceType.hpp"
55 #include "memory/resourceArea.hpp"
56 #include "memory/universe.hpp"
57 #include "oops/access.inline.hpp"
58 #include "oops/constantPool.hpp"
59 #include "oops/fieldStreams.inline.hpp"
60 #include "oops/flatArrayKlass.hpp"
61 #include "oops/instanceKlass.hpp"
62 #include "oops/klass.inline.hpp"
63 #include "oops/method.hpp"
64 #include "oops/objArrayKlass.hpp"
65 #include "oops/objArrayOop.inline.hpp"
66 #include "oops/oop.inline.hpp"
67 #include "oops/recordComponent.hpp"
68 #include "oops/refArrayOop.inline.hpp"
69 #include "prims/foreignGlobals.hpp"
70 #include "prims/jvm_misc.hpp"
71 #include "prims/jvmtiExport.hpp"
72 #include "prims/jvmtiThreadState.inline.hpp"
73 #include "prims/stackwalk.hpp"
74 #include "runtime/arguments.hpp"
75 #include "runtime/atomic.hpp"
76 #include "runtime/continuation.hpp"
77 #include "runtime/deoptimization.hpp"
78 #include "runtime/globals_extension.hpp"
79 #include "runtime/handles.inline.hpp"
80 #include "runtime/handshake.hpp"
81 #include "runtime/init.hpp"
82 #include "runtime/interfaceSupport.inline.hpp"
83 #include "runtime/java.hpp"
84 #include "runtime/javaCalls.hpp"
85 #include "runtime/javaThread.hpp"
86 #include "runtime/jfieldIDWorkaround.hpp"
87 #include "runtime/jniHandles.inline.hpp"
88 #include "runtime/os.inline.hpp"
89 #include "runtime/osThread.hpp"
90 #include "runtime/perfData.hpp"
91 #include "runtime/reflection.hpp"
92 #include "runtime/synchronizer.hpp"
93 #include "runtime/threadIdentifier.hpp"
94 #include "runtime/threadSMR.hpp"
95 #include "runtime/vframe.inline.hpp"
96 #include "runtime/vm_version.hpp"
97 #include "runtime/vmOperations.hpp"
98 #include "services/attachListener.hpp"
99 #include "services/management.hpp"
100 #include "services/threadService.hpp"
101 #include "utilities/checkedCast.hpp"
102 #include "utilities/copy.hpp"
103 #include "utilities/defaultStream.hpp"
104 #include "utilities/dtrace.hpp"
105 #include "utilities/events.hpp"
106 #include "utilities/macros.hpp"
107 #include "utilities/utf8.hpp"
108 #include "utilities/zipLibrary.hpp"
109 #if INCLUDE_CDS
110 #include "classfile/systemDictionaryShared.hpp"
111 #endif
112 #if INCLUDE_JFR
113 #include "jfr/jfr.hpp"
114 #endif
115 #if INCLUDE_MANAGEMENT
116 #include "services/finalizerService.hpp"
117 #endif
118 #ifdef LINUX
119 #include "osContainer_linux.hpp"
120 #endif
121
122 #include <errno.h>
123
124 /*
125 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
126 such ctors and calls MUST NOT come between an oop declaration/init and its
127 usage because if objects are move this may cause various memory stomps, bus
128 errors and segfaults. Here is a cookbook for causing so called "naked oop
129 failures":
130
131 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
132 // Object address to be held directly in mirror & not visible to GC
133 oop mirror = JNIHandles::resolve_non_null(ofClass);
134
135 // If this ctor can hit a safepoint, moving objects around, then
136 ComplexConstructor foo;
137
138 // Boom! mirror may point to JUNK instead of the intended object
139 (some dereference of mirror)
140
141 // Here's another call that may block for GC, making mirror stale
142 MutexLocker ml(some_lock);
143
144 // And here's an initializer that can result in a stale oop
145 // all in one step.
146 oop o = call_that_can_throw_exception(TRAPS);
147
148
149 The solution is to keep the oop declaration BELOW the ctor or function
150 call that might cause a GC, do another resolve to reassign the oop, or
151 consider use of a Handle instead of an oop so there is immunity from object
152 motion. But note that the "QUICK" entries below do not have a handlemark
153 and thus can only support use of handles passed in.
154 */
155
156 extern void trace_class_resolution(Klass* to_class) {
157 ResourceMark rm;
158 int line_number = -1;
159 const char * source_file = nullptr;
160 const char * trace = "explicit";
161 InstanceKlass* caller = nullptr;
162 JavaThread* jthread = JavaThread::current();
163 if (jthread->has_last_Java_frame()) {
164 vframeStream vfst(jthread);
165
166 // Scan up the stack skipping ClassLoader frames.
167 Method* last_caller = nullptr;
168
169 while (!vfst.at_end()) {
170 Method* m = vfst.method();
171 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
172 break;
173 }
174 last_caller = m;
175 vfst.next();
176 }
177 // if this is called from Class.forName0 and that is called from Class.forName,
178 // then print the caller of Class.forName. If this is Class.loadClass, then print
179 // that caller, otherwise keep quiet since this should be picked up elsewhere.
180 bool found_it = false;
181 if (!vfst.at_end() &&
182 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
183 vfst.method()->name() == vmSymbols::forName0_name()) {
184 vfst.next();
185 if (!vfst.at_end() &&
186 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
187 vfst.method()->name() == vmSymbols::forName_name()) {
188 vfst.next();
189 found_it = true;
190 }
191 } else if (last_caller != nullptr &&
192 last_caller->method_holder()->name() ==
193 vmSymbols::java_lang_ClassLoader() &&
194 last_caller->name() == vmSymbols::loadClass_name()) {
195 found_it = true;
196 } else if (!vfst.at_end()) {
197 if (vfst.method()->is_native()) {
198 // JNI call
199 found_it = true;
200 }
201 }
202 if (found_it && !vfst.at_end()) {
203 // found the caller
204 caller = vfst.method()->method_holder();
205 line_number = vfst.method()->line_number_from_bci(vfst.bci());
206 if (line_number == -1) {
207 // show method name if it's a native method
208 trace = vfst.method()->name_and_sig_as_C_string();
209 }
210 Symbol* s = caller->source_file_name();
211 if (s != nullptr) {
212 source_file = s->as_C_string();
213 }
214 }
215 }
216 if (caller != nullptr) {
217 if (to_class != caller) {
218 const char * from = caller->external_name();
219 const char * to = to_class->external_name();
220 // print in a single call to reduce interleaving between threads
221 if (source_file != nullptr) {
222 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
223 } else {
224 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
225 }
226 }
227 }
228 }
229
230 // java.lang.System //////////////////////////////////////////////////////////////////////
231
232
233 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
234 return os::javaTimeMillis();
235 JVM_END
236
237 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
238 return os::javaTimeNanos();
239 JVM_END
240
241 // The function below is actually exposed by jdk.internal.misc.VM and not
242 // java.lang.System, but we choose to keep it here so that it stays next
243 // to JVM_CurrentTimeMillis and JVM_NanoTime
244
245 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
246 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
247
248 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
249 jlong seconds;
250 jlong nanos;
251
252 os::javaTimeSystemUTC(seconds, nanos);
253
254 // We're going to verify that the result can fit in a long.
255 // For that we need the difference in seconds between 'seconds'
256 // and 'offset_secs' to be such that:
257 // |seconds - offset_secs| < (2^63/10^9)
258 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
259 // which makes |seconds - offset_secs| < 2^33
260 // and we will prefer +/- 2^32 as the maximum acceptable diff
261 // as 2^32 has a more natural feel than 2^33...
262 //
263 // So if |seconds - offset_secs| >= 2^32 - we return a special
264 // sentinel value (-1) which the caller should take as an
265 // exception value indicating that the offset given to us is
266 // too far from range of the current time - leading to too big
267 // a nano adjustment. The caller is expected to recover by
268 // computing a more accurate offset and calling this method
269 // again. (For the record 2^32 secs is ~136 years, so that
270 // should rarely happen)
271 //
272 jlong diff = seconds - offset_secs;
273 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
274 return -1; // sentinel value: the offset is too far off the target
275 }
276
277 // return the adjustment. If you compute a time by adding
278 // this number of nanoseconds along with the number of seconds
279 // in the offset you should get the current UTC time.
280 return (diff * (jlong)1000000000) + nanos;
281 JVM_END
282
283 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
284 jobject dst, jint dst_pos, jint length))
285 // Check if we have null pointers
286 if (src == nullptr || dst == nullptr) {
287 THROW(vmSymbols::java_lang_NullPointerException());
288 }
289 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
290 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
291 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
292 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
293 // Do copy
294 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
295 JVM_END
296
297
298 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
299 JavaValue r(T_OBJECT);
300 // public synchronized Object put(Object key, Object value);
301 HandleMark hm(THREAD);
302 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
303 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
304 JavaCalls::call_virtual(&r,
305 props,
306 vmClasses::Properties_klass(),
307 vmSymbols::put_name(),
308 vmSymbols::object_object_object_signature(),
309 key_str,
310 value_str,
311 THREAD);
312 }
313
314
315 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
316
317 /*
318 * Return all of the system properties in a Java String array with alternating
319 * names and values from the jvm SystemProperty.
320 * Which includes some internal and all commandline -D defined properties.
321 */
322 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
323 ResourceMark rm(THREAD);
324 HandleMark hm(THREAD);
325 int ndx = 0;
326 int fixedCount = 2;
327
328 SystemProperty* p = Arguments::system_properties();
329 int count = Arguments::PropertyList_count(p);
330
331 // Allocate result String array
332 InstanceKlass* ik = vmClasses::String_klass();
333 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
334 objArrayHandle result_h(THREAD, r);
335
336 while (p != nullptr) {
337 const char * key = p->key();
338 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
339 const char * value = p->value();
340 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
341 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
342 result_h->obj_at_put(ndx * 2, key_str());
343 result_h->obj_at_put(ndx * 2 + 1, value_str());
344 ndx++;
345 }
346 p = p->next();
347 }
348
349 // Convert the -XX:MaxDirectMemorySize= command line flag
350 // to the sun.nio.MaxDirectMemorySize property.
351 // Do this after setting user properties to prevent people
352 // from setting the value with a -D option, as requested.
353 // Leave empty if not supplied
354 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
355 char as_chars[256];
356 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
357 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
358 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
359 result_h->obj_at_put(ndx * 2, key_str());
360 result_h->obj_at_put(ndx * 2 + 1, value_str());
361 ndx++;
362 }
363
364 // JVM monitoring and management support
365 // Add the sun.management.compiler property for the compiler's name
366 {
367 #undef CSIZE
368 #if defined(_LP64)
369 #define CSIZE "64-Bit "
370 #else
371 #define CSIZE
372 #endif // 64bit
373
374 #if COMPILER1_AND_COMPILER2
375 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
376 #else
377 #if defined(COMPILER1)
378 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
379 #elif defined(COMPILER2)
380 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
381 #elif INCLUDE_JVMCI
382 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
383 #else
384 const char* compiler_name = "";
385 #endif // compilers
386 #endif // COMPILER1_AND_COMPILER2
387
388 if (*compiler_name != '\0' &&
389 (Arguments::mode() != Arguments::_int)) {
390 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
391 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
392 result_h->obj_at_put(ndx * 2, key_str());
393 result_h->obj_at_put(ndx * 2 + 1, value_str());
394 ndx++;
395 }
396 }
397
398 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
399 JVM_END
400
401
402 /*
403 * Return the temporary directory that the VM uses for the attach
404 * and perf data files.
405 *
406 * It is important that this directory is well-known and the
407 * same for all VM instances. It cannot be affected by configuration
408 * variables such as java.io.tmpdir.
409 */
410 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
411 HandleMark hm(THREAD);
412 const char* temp_dir = os::get_temp_directory();
413 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
414 return (jstring) JNIHandles::make_local(THREAD, h());
415 JVM_END
416
417 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
418 if (len < 0) {
419 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
420 }
421 elmClass->initialize(CHECK);
422 if (elmClass->is_array_klass() || elmClass->is_identity_class()) {
423 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
424 }
425 if (elmClass->is_abstract()) {
426 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
427 }
428 }
429
430 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
431 oop o = JNIHandles::resolve_non_null(orig);
432 assert(o->is_array(), "Must be");
433 oop array = nullptr;
434 arrayOop org = (arrayOop)o;
435 arrayHandle oh(THREAD, org);
436 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass());
437 InlineKlass* vk = InlineKlass::cast(ak->element_klass());
438 int len = to - from; // length of the new array
439 if (ak->is_null_free_array_klass()) {
440 if ((len != 0) && (from >= org->length() || to > org->length())) {
441 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
442 }
443 }
444 if (org->is_flatArray()) {
445 FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass());
446 LayoutKind lk = fak->layout_kind();
447 ArrayKlass::ArrayProperties props = ArrayKlass::ArrayProperties::DEFAULT;
448 switch(lk) {
449 case LayoutKind::ATOMIC_FLAT:
450 props = ArrayKlass::ArrayProperties::NULL_RESTRICTED;
451 break;
452 case LayoutKind::NON_ATOMIC_FLAT:
453 props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED | ArrayKlass::ArrayProperties::NON_ATOMIC);
454 break;
455 case LayoutKind::NULLABLE_ATOMIC_FLAT:
456 props = ArrayKlass::ArrayProperties::NON_ATOMIC;
457 break;
458 default:
459 ShouldNotReachHere();
460 }
461 array = oopFactory::new_flatArray(vk, len, props, lk, CHECK_NULL);
462 arrayHandle ah(THREAD, (arrayOop)array);
463 int end = to < oh()->length() ? to : oh()->length();
464 for (int i = from; i < end; i++) {
465 void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper());
466 void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper());
467 vk->copy_payload_to_addr(src, dst, lk, false);
468 }
469 array = ah();
470 } else {
471 ArrayKlass::ArrayProperties props = org->is_null_free_array() ? ArrayKlass::ArrayProperties::NULL_RESTRICTED : ArrayKlass::ArrayProperties::DEFAULT;
472 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL);
473 int end = to < oh()->length() ? to : oh()->length();
474 for (int i = from; i < end; i++) {
475 if (i < ((objArrayOop)oh())->length()) {
476 ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i));
477 } else {
478 assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
479 ((objArrayOop)array)->obj_at_put(i - from, nullptr);
480 }
481 }
482 }
483 return (jarray) JNIHandles::make_local(THREAD, array);
484 JVM_END
485
486 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
487 oop mirror = JNIHandles::resolve_non_null(elmClass);
488 oop init = JNIHandles::resolve(initVal);
489 if (init == nullptr) {
490 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
491 }
492 Handle init_h(THREAD, init);
493 Klass* klass = java_lang_Class::as_Klass(mirror);
494 if (klass != init_h()->klass()) {
495 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
496 }
497 validate_array_arguments(klass, len, CHECK_NULL);
498 InlineKlass* vk = InlineKlass::cast(klass);
499 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NON_ATOMIC | ArrayKlass::ArrayProperties::NULL_RESTRICTED);
500 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
501 for (int i = 0; i < len; i++) {
502 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
503 }
504 return (jarray) JNIHandles::make_local(THREAD, array);
505 JVM_END
506
507 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
508 oop mirror = JNIHandles::resolve_non_null(elmClass);
509 oop init = JNIHandles::resolve(initVal);
510 if (init == nullptr) {
511 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
512 }
513 Handle init_h(THREAD, init);
514 Klass* klass = java_lang_Class::as_Klass(mirror);
515 if (klass != init_h()->klass()) {
516 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
517 }
518 validate_array_arguments(klass, len, CHECK_NULL);
519 InlineKlass* vk = InlineKlass::cast(klass);
520 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED);
521 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
522 for (int i = 0; i < len; i++) {
523 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
524 }
525 return (jarray) JNIHandles::make_local(THREAD, array);
526 JVM_END
527
528 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
529 oop mirror = JNIHandles::resolve_non_null(elmClass);
530 Klass* klass = java_lang_Class::as_Klass(mirror);
531 klass->initialize(CHECK_NULL);
532 validate_array_arguments(klass, len, CHECK_NULL);
533 InlineKlass* vk = InlineKlass::cast(klass);
534 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::DEFAULT);
535 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
536 return (jarray) JNIHandles::make_local(THREAD, array);
537 JVM_END
538
539 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
540 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
541 return oop->is_flatArray();
542 JVM_END
543
544 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
545 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
546 return oop->is_null_free_array();
547 JVM_END
548
549 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
550 // There are multiple cases where an array can/must support atomic access:
551 // - the array is a reference array
552 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or ATOMIC_FLAT
553 // - the array is flat and its component type is naturally atomic
554 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
555 if (oop->is_refArray()) return true;
556 if (oop->is_flatArray()) {
557 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
558 if (fak->layout_kind() == LayoutKind::ATOMIC_FLAT || fak->layout_kind() == LayoutKind::NULLABLE_ATOMIC_FLAT) {
559 return true;
560 }
561 if (fak->element_klass()->is_naturally_atomic()) return true;
562 }
563 return false;
564 JVM_END
565
566 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
567
568 extern volatile jint vm_created;
569
570 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
571 EventShutdown event;
572 if (event.should_commit()) {
573 event.set_reason("Shutdown requested from Java");
574 event.commit();
575 }
576 JVM_END
577
578
579 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
580 before_exit(thread, true);
581 vm_exit(code);
582 JVM_END
583
584
585 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
586 if (!DisableExplicitGC) {
587 EventSystemGC event;
588 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
589 Universe::heap()->collect(GCCause::_java_lang_system_gc);
590 event.commit();
591 }
592 JVM_END
593
594
595 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
596 return Universe::heap()->millis_since_last_whole_heap_examined();
597 JVM_END
598
599
600 static inline jlong convert_size_t_to_jlong(size_t val) {
601 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
602 NOT_LP64 (return (jlong)val;)
603 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
604 }
605
606 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
607 size_t n = Universe::heap()->capacity();
608 return convert_size_t_to_jlong(n);
609 JVM_END
610
611
612 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
613 size_t n = Universe::heap()->unused();
614 return convert_size_t_to_jlong(n);
615 JVM_END
616
617
618 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
619 size_t n = Universe::heap()->max_capacity();
620 return convert_size_t_to_jlong(n);
621 JVM_END
622
623
624 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
625 return os::active_processor_count();
626 JVM_END
627
628 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
629 #ifdef LINUX
630 if (UseContainerSupport) {
631 return JNI_TRUE;
632 }
633 #endif
634 return JNI_FALSE;
635 JVM_END
636
637 JVM_LEAF(jboolean, JVM_IsContainerized(void))
638 #ifdef LINUX
639 if (OSContainer::is_containerized()) {
640 return JNI_TRUE;
641 }
642 #endif
643 return JNI_FALSE;
644 JVM_END
645
646 // java.lang.Throwable //////////////////////////////////////////////////////
647
648 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
649 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
650 java_lang_Throwable::fill_in_stack_trace(exception);
651 JVM_END
652
653 // java.lang.NullPointerException ///////////////////////////////////////////
654
655 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
656 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
657
658 oop exc = JNIHandles::resolve_non_null(throwable);
659
660 Method* method;
661 int bci;
662 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
663 return nullptr;
664 }
665 if (method->is_native()) {
666 return nullptr;
667 }
668
669 stringStream ss;
670 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
671 if (ok) {
672 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
673 return (jstring) JNIHandles::make_local(THREAD, result);
674 } else {
675 return nullptr;
676 }
677 JVM_END
678
679 // java.lang.StackTraceElement //////////////////////////////////////////////
680
681
682 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
683 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
684 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
685 objArrayHandle stack_trace(THREAD, st);
686 // Fill in the allocated stack trace
687 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
688 JVM_END
689
690
691 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
692 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
693 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
694 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
695 JVM_END
696
697
698 // java.lang.StackWalker //////////////////////////////////////////////////////
699 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
700 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
701
702 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
703 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
704 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
705 if (!have_name) {
706 oop name = StringTable::intern(method->name(), CHECK);
707 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
708 }
709 if (!have_type) {
710 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
711 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
712 }
713 JVM_END
714
715 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
716 jint skip_frames, jobject contScope, jobject cont,
717 jint buffer_size, jint start_index, jobjectArray frames))
718 if (!thread->has_last_Java_frame()) {
719 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
720 }
721
722 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
723 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
724 Handle cont_h(THREAD, JNIHandles::resolve(cont));
725 // frames array is a ClassFrameInfo[] array when only getting caller reference,
726 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
727 // be null.
728 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
729 objArrayHandle frames_array_h(THREAD, fa);
730
731 if (frames_array_h->length() < buffer_size) {
732 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
733 }
734
735 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
736 buffer_size, start_index, frames_array_h, CHECK_NULL);
737 return JNIHandles::make_local(THREAD, result);
738 JVM_END
739
740
741 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
742 jint last_batch_count, jint buffer_size, jint start_index,
743 jobjectArray frames))
744 // frames array is a ClassFrameInfo[] array when only getting caller reference,
745 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
746 // be null.
747 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
748 objArrayHandle frames_array_h(THREAD, fa);
749
750 if (frames_array_h->length() < buffer_size) {
751 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
752 }
753
754 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
755 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
756 start_index, frames_array_h, THREAD);
757 JVM_END
758
759 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
760 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
761 objArrayHandle frames_array_h(THREAD, fa);
762 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
763 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
764
765 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
766 JVM_END
767
768 // java.lang.Object ///////////////////////////////////////////////
769
770
771 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
772 // as implemented in the classic virtual machine; return 0 if object is null
773 if (handle == nullptr) {
774 return 0;
775 }
776 oop obj = JNIHandles::resolve_non_null(handle);
777 if (EnableValhalla && obj->klass()->is_inline_klass()) {
778 JavaValue result(T_INT);
779 JavaCallArguments args;
780 Handle ho(THREAD, obj);
781 args.push_oop(ho);
782 methodHandle method(THREAD, Universe::value_object_hash_code_method());
783 JavaCalls::call(&result, method, &args, THREAD);
784 if (HAS_PENDING_EXCEPTION) {
785 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
786 Handle e(THREAD, PENDING_EXCEPTION);
787 CLEAR_PENDING_EXCEPTION;
788 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
789 }
790 }
791 return result.get_jint();
792 } else {
793 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
794 }
795 JVM_END
796
797
798 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
799 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
800 ObjectSynchronizer::wait(obj, ms, CHECK);
801 JVM_END
802
803
804 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
805 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
806 ObjectSynchronizer::notify(obj, CHECK);
807 JVM_END
808
809
810 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
811 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
812 ObjectSynchronizer::notifyall(obj, CHECK);
813 JVM_END
814
815
816 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
817 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
818 Klass* klass = obj->klass();
819 JvmtiVMObjectAllocEventCollector oam;
820
821 #ifdef ASSERT
822 // Just checking that the cloneable flag is set correct
823 if (obj->is_array()) {
824 guarantee(klass->is_cloneable(), "all arrays are cloneable");
825 } else {
826 guarantee(obj->is_instance(), "should be instanceOop");
827 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
828 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
829 }
830 #endif
831
832 // Check if class of obj supports the Cloneable interface.
833 // All arrays are considered to be cloneable (See JLS 20.1.5).
834 // All j.l.r.Reference classes are considered non-cloneable.
835 if (!klass->is_cloneable() ||
836 (klass->is_instance_klass() &&
837 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
838 ResourceMark rm(THREAD);
839 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
840 }
841
842 if (klass->is_inline_klass()) {
843 // Value instances have no identity, so return the current instance instead of allocating a new one
844 // Value classes cannot have finalizers, so the method can return immediately
845 return JNIHandles::make_local(THREAD, obj());
846 }
847
848 // Make shallow object copy
849 const size_t size = obj->size();
850 oop new_obj_oop = nullptr;
851 if (obj->is_array()) {
852 const int length = ((arrayOop)obj())->length();
853 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
854 /* do_zero */ true, CHECK_NULL);
855 } else {
856 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
857 }
858
859 HeapAccess<>::clone(obj(), new_obj_oop, size);
860
861 Handle new_obj(THREAD, new_obj_oop);
862 // Caution: this involves a java upcall, so the clone should be
863 // "gc-robust" by this stage.
864 if (klass->has_finalizer()) {
865 assert(obj->is_instance(), "should be instanceOop");
866 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
867 new_obj = Handle(THREAD, new_obj_oop);
868 }
869
870 return JNIHandles::make_local(THREAD, new_obj());
871 JVM_END
872
873 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
874
875 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
876 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
877 JVM_END
878
879 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
880 return InstanceKlass::is_finalization_enabled();
881 JVM_END
882
883 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
884
885 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
886 CONT_RegisterNativeMethods(env, cls);
887 JVM_END
888
889 // java.io.File ///////////////////////////////////////////////////////////////
890
891 JVM_LEAF(char*, JVM_NativePath(char* path))
892 return os::native_path(path);
893 JVM_END
894
895
896 // Misc. class handling ///////////////////////////////////////////////////////////
897
898
899 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
900 // Getting the class of the caller frame.
901 //
902 // The call stack at this point looks something like this:
903 //
904 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
905 // [1] [ @CallerSensitive API.method ]
906 // [.] [ (skipped intermediate frames) ]
907 // [n] [ caller ]
908 vframeStream vfst(thread);
909 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
910 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
911 Method* m = vfst.method();
912 assert(m != nullptr, "sanity");
913 switch (n) {
914 case 0:
915 // This must only be called from Reflection.getCallerClass
916 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
917 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
918 }
919 // fall-through
920 case 1:
921 // Frame 0 and 1 must be caller sensitive.
922 if (!m->caller_sensitive()) {
923 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
924 }
925 break;
926 default:
927 if (!m->is_ignored_by_security_stack_walk()) {
928 // We have reached the desired frame; return the holder class.
929 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
930 }
931 break;
932 }
933 }
934 return nullptr;
935 JVM_END
936
937
938 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
939 oop mirror = nullptr;
940 BasicType t = name2type(utf);
941 if (t != T_ILLEGAL && !is_reference_type(t)) {
942 mirror = Universe::java_mirror(t);
943 }
944 if (mirror == nullptr) {
945 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
946 } else {
947 return (jclass) JNIHandles::make_local(THREAD, mirror);
948 }
949 JVM_END
950
951
952 // Returns a class loaded by the bootstrap class loader; or null
953 // if not found. ClassNotFoundException is not thrown.
954 // FindClassFromBootLoader is exported to the launcher for windows.
955 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
956 const char* name))
957 // Java libraries should ensure that name is never null or illegal.
958 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
959 // It's impossible to create this class; the name cannot fit
960 // into the constant pool.
961 return nullptr;
962 }
963 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
964
965 TempNewSymbol h_name = SymbolTable::new_symbol(name);
966 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
967 if (k == nullptr) {
968 return nullptr;
969 }
970
971 if (log_is_enabled(Debug, class, resolve)) {
972 trace_class_resolution(k);
973 }
974 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
975 JVM_END
976
977 // Find a class with this name in this loader, using the caller's protection domain.
978 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
979 jboolean init, jobject loader,
980 jclass caller))
981 TempNewSymbol h_name =
982 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
983 CHECK_NULL);
984
985 oop loader_oop = JNIHandles::resolve(loader);
986 oop from_class = JNIHandles::resolve(caller);
987 Handle h_loader(THREAD, loader_oop);
988
989 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
990 false, THREAD);
991
992 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
993 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
994 }
995 return result;
996 JVM_END
997
998 // Currently only called from the old verifier.
999 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1000 jboolean init, jclass from))
1001 TempNewSymbol h_name =
1002 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1003 CHECK_NULL);
1004 oop from_class_oop = JNIHandles::resolve(from);
1005 Klass* from_class = (from_class_oop == nullptr)
1006 ? (Klass*)nullptr
1007 : java_lang_Class::as_Klass(from_class_oop);
1008 oop class_loader = nullptr;
1009 if (from_class != nullptr) {
1010 class_loader = from_class->class_loader();
1011 }
1012 Handle h_loader(THREAD, class_loader);
1013 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1014
1015 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1016 // this function is generally only used for class loading during verification.
1017 ResourceMark rm;
1018 oop from_mirror = JNIHandles::resolve_non_null(from);
1019 Klass* from_class = java_lang_Class::as_Klass(from_mirror);
1020 const char * from_name = from_class->external_name();
1021
1022 oop mirror = JNIHandles::resolve_non_null(result);
1023 Klass* to_class = java_lang_Class::as_Klass(mirror);
1024 const char * to = to_class->external_name();
1025 log_debug(class, resolve)("%s %s (verification)", from_name, to);
1026 }
1027
1028 return result;
1029 JVM_END
1030
1031 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1032 static jclass jvm_define_class_common(const char *name,
1033 jobject loader, const jbyte *buf,
1034 jsize len, jobject pd, const char *source,
1035 TRAPS) {
1036 if (source == nullptr) source = "__JVM_DefineClass__";
1037
1038 JavaThread* jt = THREAD;
1039
1040 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1041 ClassLoader::perf_define_appclass_selftime(),
1042 ClassLoader::perf_define_appclasses(),
1043 jt->get_thread_stat()->perf_recursion_counts_addr(),
1044 jt->get_thread_stat()->perf_timers_addr(),
1045 PerfClassTraceTime::DEFINE_CLASS);
1046
1047 if (UsePerfData) {
1048 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1049 }
1050
1051 // Class resolution will get the class name from the .class stream if the name is null.
1052 TempNewSymbol class_name = name == nullptr ? nullptr :
1053 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1054 CHECK_NULL);
1055
1056 ResourceMark rm(THREAD);
1057 ClassFileStream st((u1*)buf, len, source);
1058 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1059 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1060 ClassLoadInfo cl_info(protection_domain);
1061 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1062 class_loader,
1063 cl_info,
1064 CHECK_NULL);
1065
1066 if (log_is_enabled(Debug, class, resolve)) {
1067 trace_class_resolution(k);
1068 }
1069
1070 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1071 }
1072
1073 enum {
1074 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1075 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1076 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1077 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1078 };
1079
1080 /*
1081 * Define a class with the specified flags that indicates if it's a nestmate,
1082 * hidden, or strongly referenced from class loader.
1083 */
1084 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1085 const jbyte *buf, jsize len, jobject pd,
1086 jboolean init, int flags, jobject classData, TRAPS) {
1087 ResourceMark rm(THREAD);
1088
1089 Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
1090 // Lookup class must be a non-null instance
1091 if (lookup_k == nullptr) {
1092 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1093 }
1094 assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
1095
1096 Handle class_loader (THREAD, lookup_k->class_loader());
1097
1098 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1099 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1100 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1101 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1102
1103 InstanceKlass* host_class = nullptr;
1104 if (is_nestmate) {
1105 host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
1106 }
1107
1108 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1109 name,
1110 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1111 is_nestmate ? host_class->external_name() : "",
1112 is_hidden ? "hidden" : "not hidden",
1113 is_strong ? "strong" : "weak",
1114 vm_annotations ? "with vm annotations" : "without vm annotation");
1115
1116 if (!is_hidden) {
1117 // classData is only applicable for hidden classes
1118 if (classData != nullptr) {
1119 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1120 }
1121 if (is_nestmate) {
1122 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1123 }
1124 if (!is_strong) {
1125 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1126 }
1127 if (vm_annotations) {
1128 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1129 }
1130 if (flags != STRONG_LOADER_LINK) {
1131 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1132 err_msg("invalid flag 0x%x", flags));
1133 }
1134 }
1135
1136 // Class resolution will get the class name from the .class stream if the name is null.
1137 TempNewSymbol class_name = name == nullptr ? nullptr :
1138 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1139 CHECK_NULL);
1140
1141 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1142 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1143 ClassFileStream st((u1*)buf, len, source);
1144
1145 InstanceKlass* ik = nullptr;
1146 if (!is_hidden) {
1147 ClassLoadInfo cl_info(protection_domain);
1148 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1149 class_loader,
1150 cl_info,
1151 CHECK_NULL);
1152
1153 if (log_is_enabled(Debug, class, resolve)) {
1154 trace_class_resolution(ik);
1155 }
1156 } else { // hidden
1157 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1158 ClassLoadInfo cl_info(protection_domain,
1159 host_class,
1160 classData_h,
1161 is_hidden,
1162 is_strong,
1163 vm_annotations);
1164 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1165 class_loader,
1166 cl_info,
1167 CHECK_NULL);
1168
1169 // The hidden class loader data has been artificially been kept alive to
1170 // this point. The mirror and any instances of this class have to keep
1171 // it alive afterwards.
1172 ik->class_loader_data()->dec_keep_alive_ref_count();
1173
1174 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1175 ModuleEntry* module = ik->module();
1176 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1177 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1178 module_name,
1179 ik->external_name(),
1180 host_class->external_name(),
1181 ik->is_hidden() ? "is hidden" : "is not hidden");
1182 }
1183 }
1184
1185 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1186 // non-hidden class or nestmate class must be in the same package as the Lookup class
1187 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1188 }
1189
1190 if (init) {
1191 ik->initialize(CHECK_NULL);
1192 } else {
1193 ik->link_class(CHECK_NULL);
1194 }
1195
1196 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1197 }
1198
1199 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1200 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1201 JVM_END
1202
1203 /*
1204 * Define a class with the specified lookup class.
1205 * lookup: Lookup class
1206 * name: the name of the class
1207 * buf: class bytes
1208 * len: length of class bytes
1209 * pd: protection domain
1210 * init: initialize the class
1211 * flags: properties of the class
1212 * classData: private static pre-initialized field
1213 */
1214 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1215 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1216
1217 if (lookup == nullptr) {
1218 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1219 }
1220
1221 assert(buf != nullptr, "buf must not be null");
1222
1223 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1224 JVM_END
1225
1226 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1227
1228 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1229 JVM_END
1230
1231 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1232 ResourceMark rm(THREAD);
1233
1234 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1235 char* str = java_lang_String::as_utf8_string(h_name());
1236
1237 // Sanity check, don't expect null
1238 if (str == nullptr) return nullptr;
1239
1240 // Internalize the string, converting '.' to '/' in string.
1241 char* p = (char*)str;
1242 while (*p != '\0') {
1243 if (*p == '.') {
1244 *p = '/';
1245 }
1246 p++;
1247 }
1248
1249 const int str_len = (int)(p - str);
1250 if (str_len > Symbol::max_length()) {
1251 // It's impossible to create this class; the name cannot fit
1252 // into the constant pool.
1253 return nullptr;
1254 }
1255 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1256
1257 // Security Note:
1258 // The Java level wrapper will perform the necessary security check allowing
1259 // us to pass the null as the initiating class loader.
1260 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1261 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1262 #if INCLUDE_CDS
1263 if (k == nullptr) {
1264 // If the class is not already loaded, try to see if it's in the shared
1265 // archive for the current classloader (h_loader).
1266 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1267 }
1268 #endif
1269 return (k == nullptr) ? nullptr :
1270 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1271 JVM_END
1272
1273 // Module support //////////////////////////////////////////////////////////////////////////////
1274
1275 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1276 jstring location, jobjectArray packages))
1277 Handle h_module (THREAD, JNIHandles::resolve(module));
1278 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1279 JVM_END
1280
1281 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1282 Handle h_module (THREAD, JNIHandles::resolve(module));
1283 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1284 JVM_END
1285
1286 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1287 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1288 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1289 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1290 JVM_END
1291
1292 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1293 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1294 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1295 JVM_END
1296
1297 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1298 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1299 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1300 JVM_END
1301
1302 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1303 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1304 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1305 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1306 JVM_END
1307
1308 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1309 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1310 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1311 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1312 JVM_END
1313
1314 // Reflection support //////////////////////////////////////////////////////////////////////////////
1315
1316 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1317 assert (cls != nullptr, "illegal class");
1318 JvmtiVMObjectAllocEventCollector oam;
1319 ResourceMark rm(THREAD);
1320 HandleMark hm(THREAD);
1321 Handle java_class(THREAD, JNIHandles::resolve(cls));
1322 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1323 return (jstring) JNIHandles::make_local(THREAD, result);
1324 JVM_END
1325
1326
1327 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1328 JvmtiVMObjectAllocEventCollector oam;
1329 oop mirror = JNIHandles::resolve_non_null(cls);
1330
1331 // Special handling for primitive objects
1332 if (java_lang_Class::is_primitive(mirror)) {
1333 // Primitive objects does not have any interfaces
1334 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1335 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1336 }
1337
1338 Klass* klass = java_lang_Class::as_Klass(mirror);
1339 // Figure size of result array
1340 int size;
1341 if (klass->is_instance_klass()) {
1342 InstanceKlass* ik = InstanceKlass::cast(klass);
1343 size = ik->local_interfaces()->length();
1344 } else {
1345 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1346 size = 2;
1347 }
1348
1349 // Allocate result array
1350 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1351 objArrayHandle result (THREAD, r);
1352 // Fill in result
1353 if (klass->is_instance_klass()) {
1354 // Regular instance klass, fill in all local interfaces
1355 for (int index = 0; index < size; index++) {
1356 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1357 result->obj_at_put(index, k->java_mirror());
1358 }
1359 } else {
1360 // All arrays implement java.lang.Cloneable and java.io.Serializable
1361 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1362 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1363 }
1364 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1365 JVM_END
1366
1367
1368 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1369 oop mirror = JNIHandles::resolve_non_null(cls);
1370 if (java_lang_Class::is_primitive(mirror)) {
1371 return JNI_FALSE;
1372 }
1373 Klass* k = java_lang_Class::as_Klass(mirror);
1374 return k->is_hidden();
1375 JVM_END
1376
1377 class ScopedValueBindingsResolver {
1378 public:
1379 InstanceKlass* Carrier_klass;
1380 ScopedValueBindingsResolver(JavaThread* THREAD) {
1381 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1382 Carrier_klass = InstanceKlass::cast(k);
1383 }
1384 };
1385
1386 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1387 ResourceMark rm(THREAD);
1388 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1389 JvmtiVMObjectAllocEventCollector oam;
1390
1391 static ScopedValueBindingsResolver resolver(THREAD);
1392
1393 // Iterate through Java frames
1394 vframeStream vfst(thread);
1395 for(; !vfst.at_end(); vfst.next()) {
1396 int loc = -1;
1397 // get method of frame
1398 Method* method = vfst.method();
1399
1400 Symbol *name = method->name();
1401
1402 InstanceKlass* holder = method->method_holder();
1403 if (name == vmSymbols::runWith_method_name()) {
1404 if (holder == vmClasses::Thread_klass()
1405 || holder == resolver.Carrier_klass) {
1406 loc = 1;
1407 }
1408 }
1409
1410 if (loc != -1) {
1411 javaVFrame *frame = vfst.asJavaVFrame();
1412 StackValueCollection* locals = frame->locals();
1413 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1414 Handle result = head_sv->get_obj();
1415 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1416 if (result() != nullptr) {
1417 return JNIHandles::make_local(THREAD, result());
1418 }
1419 }
1420 }
1421
1422 return nullptr;
1423 JVM_END
1424
1425 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1426 JvmtiVMObjectAllocEventCollector oam;
1427 // ofClass is a reference to a java_lang_Class object. The mirror object
1428 // of an InstanceKlass
1429 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1430 if (java_lang_Class::is_primitive(ofMirror) ||
1431 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1432 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1433 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1434 }
1435
1436 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1437 InnerClassesIterator iter(k);
1438
1439 if (iter.length() == 0) {
1440 // Neither an inner nor outer class
1441 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1442 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1443 }
1444
1445 // find inner class info
1446 constantPoolHandle cp(thread, k->constants());
1447 int length = iter.length();
1448
1449 // Allocate temp. result array
1450 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1451 objArrayHandle result (THREAD, r);
1452 int members = 0;
1453
1454 for (; !iter.done(); iter.next()) {
1455 int ioff = iter.inner_class_info_index();
1456 int ooff = iter.outer_class_info_index();
1457
1458 if (ioff != 0 && ooff != 0) {
1459 // Check to see if the name matches the class we're looking for
1460 // before attempting to find the class.
1461 if (cp->klass_name_at_matches(k, ooff)) {
1462 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1463 if (outer_klass == k) {
1464 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1465 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1466
1467 // Throws an exception if outer klass has not declared k as
1468 // an inner klass
1469 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1470
1471 result->obj_at_put(members, inner_klass->java_mirror());
1472 members++;
1473 }
1474 }
1475 }
1476 }
1477
1478 if (members != length) {
1479 // Return array of right length
1480 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1481 for(int i = 0; i < members; i++) {
1482 res->obj_at_put(i, result->obj_at(i));
1483 }
1484 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1485 }
1486
1487 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1488 JVM_END
1489
1490
1491 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1492 {
1493 // ofClass is a reference to a java_lang_Class object.
1494 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1495 if (java_lang_Class::is_primitive(ofMirror)) {
1496 return nullptr;
1497 }
1498 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1499 if (!klass->is_instance_klass()) {
1500 return nullptr;
1501 }
1502
1503 bool inner_is_member = false;
1504 Klass* outer_klass
1505 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1506 if (outer_klass == nullptr) return nullptr; // already a top-level class
1507 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1508 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1509 }
1510 JVM_END
1511
1512 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1513 {
1514 oop mirror = JNIHandles::resolve_non_null(cls);
1515 if (java_lang_Class::is_primitive(mirror)) {
1516 return nullptr;
1517 }
1518 Klass* klass = java_lang_Class::as_Klass(mirror);
1519 if (!klass->is_instance_klass()) {
1520 return nullptr;
1521 }
1522 InstanceKlass* k = InstanceKlass::cast(klass);
1523 int ooff = 0, noff = 0;
1524 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1525 if (noff != 0) {
1526 constantPoolHandle i_cp(thread, k->constants());
1527 Symbol* name = i_cp->symbol_at(noff);
1528 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1529 return (jstring) JNIHandles::make_local(THREAD, str());
1530 }
1531 }
1532 return nullptr;
1533 }
1534 JVM_END
1535
1536 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1537 assert (cls != nullptr, "illegal class");
1538 JvmtiVMObjectAllocEventCollector oam;
1539 ResourceMark rm(THREAD);
1540 oop mirror = JNIHandles::resolve_non_null(cls);
1541 // Return null for arrays and primitives
1542 if (!java_lang_Class::is_primitive(mirror)) {
1543 Klass* k = java_lang_Class::as_Klass(mirror);
1544 if (k->is_instance_klass()) {
1545 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1546 if (sym == nullptr) return nullptr;
1547 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1548 return (jstring) JNIHandles::make_local(THREAD, str());
1549 }
1550 }
1551 return nullptr;
1552 JVM_END
1553
1554
1555 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1556 assert (cls != nullptr, "illegal class");
1557 oop mirror = JNIHandles::resolve_non_null(cls);
1558 // Return null for arrays and primitives
1559 if (!java_lang_Class::is_primitive(mirror)) {
1560 Klass* k = java_lang_Class::as_Klass(mirror);
1561 if (k->is_instance_klass()) {
1562 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1563 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1564 }
1565 }
1566 return nullptr;
1567 JVM_END
1568
1569
1570 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1571 // some of this code was adapted from from jni_FromReflectedField
1572
1573 oop reflected = JNIHandles::resolve_non_null(field);
1574 oop mirror = java_lang_reflect_Field::clazz(reflected);
1575 Klass* k = java_lang_Class::as_Klass(mirror);
1576 int slot = java_lang_reflect_Field::slot(reflected);
1577 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1578
1579 InstanceKlass* ik = InstanceKlass::cast(k);
1580 int offset = ik->field_offset(slot);
1581
1582 if (modifiers & JVM_ACC_STATIC) {
1583 // for static fields we only look in the current class
1584 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1585 assert(false, "cannot find static field");
1586 return false;
1587 }
1588 } else {
1589 // for instance fields we start with the current class and work
1590 // our way up through the superclass chain
1591 if (!ik->find_field_from_offset(offset, false, &fd)) {
1592 assert(false, "cannot find instance field");
1593 return false;
1594 }
1595 }
1596 return true;
1597 }
1598
1599 static Method* jvm_get_method_common(jobject method) {
1600 // some of this code was adapted from from jni_FromReflectedMethod
1601
1602 oop reflected = JNIHandles::resolve_non_null(method);
1603 oop mirror = nullptr;
1604 int slot = 0;
1605
1606 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1607 mirror = java_lang_reflect_Constructor::clazz(reflected);
1608 slot = java_lang_reflect_Constructor::slot(reflected);
1609 } else {
1610 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1611 "wrong type");
1612 mirror = java_lang_reflect_Method::clazz(reflected);
1613 slot = java_lang_reflect_Method::slot(reflected);
1614 }
1615 Klass* k = java_lang_Class::as_Klass(mirror);
1616
1617 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1618 assert(m != nullptr, "cannot find method");
1619 return m; // caller has to deal with null in product mode
1620 }
1621
1622 /* Type use annotations support (JDK 1.8) */
1623
1624 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1625 assert (cls != nullptr, "illegal class");
1626 ResourceMark rm(THREAD);
1627 // Return null for arrays and primitives
1628 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1629 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1630 if (k->is_instance_klass()) {
1631 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1632 if (type_annotations != nullptr) {
1633 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1634 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1635 }
1636 }
1637 }
1638 return nullptr;
1639 JVM_END
1640
1641 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1642 assert (method != nullptr, "illegal method");
1643 // method is a handle to a java.lang.reflect.Method object
1644 Method* m = jvm_get_method_common(method);
1645 if (m == nullptr) {
1646 return nullptr;
1647 }
1648
1649 AnnotationArray* type_annotations = m->type_annotations();
1650 if (type_annotations != nullptr) {
1651 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1652 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1653 }
1654
1655 return nullptr;
1656 JVM_END
1657
1658 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1659 assert (field != nullptr, "illegal field");
1660 fieldDescriptor fd;
1661 bool gotFd = jvm_get_field_common(field, fd);
1662 if (!gotFd) {
1663 return nullptr;
1664 }
1665
1666 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1667 JVM_END
1668
1669 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1670 if (!cp->is_within_bounds(index)) {
1671 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1672 }
1673 }
1674
1675 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1676 {
1677 // method is a handle to a java.lang.reflect.Method object
1678 Method* method_ptr = jvm_get_method_common(method);
1679 methodHandle mh (THREAD, method_ptr);
1680 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1681 const int num_params = mh->method_parameters_length();
1682
1683 if (num_params < 0) {
1684 // A -1 return value from method_parameters_length means there is no
1685 // parameter data. Return null to indicate this to the reflection
1686 // API.
1687 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1688 return (jobjectArray)nullptr;
1689 } else {
1690 // Otherwise, we return something up to reflection, even if it is
1691 // a zero-length array. Why? Because in some cases this can
1692 // trigger a MalformedParametersException.
1693
1694 // make sure all the symbols are properly formatted
1695 for (int i = 0; i < num_params; i++) {
1696 MethodParametersElement* params = mh->method_parameters_start();
1697 int index = params[i].name_cp_index;
1698 constantPoolHandle cp(THREAD, mh->constants());
1699 bounds_check(cp, index, CHECK_NULL);
1700
1701 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1702 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1703 "Wrong type at constant pool index");
1704 }
1705
1706 }
1707
1708 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1709 objArrayHandle result (THREAD, result_oop);
1710
1711 for (int i = 0; i < num_params; i++) {
1712 MethodParametersElement* params = mh->method_parameters_start();
1713 // For a 0 index, give a null symbol
1714 Symbol* sym = 0 != params[i].name_cp_index ?
1715 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1716 int flags = params[i].flags;
1717 oop param = Reflection::new_parameter(reflected_method, i, sym,
1718 flags, CHECK_NULL);
1719 result->obj_at_put(i, param);
1720 }
1721 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1722 }
1723 }
1724 JVM_END
1725
1726 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1727
1728 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1729 {
1730 JvmtiVMObjectAllocEventCollector oam;
1731
1732 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1733 // Exclude primitive types and array types
1734 if (java_lang_Class::is_primitive(ofMirror) ||
1735 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1736 // Return empty array
1737 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1738 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1739 }
1740
1741 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1742 constantPoolHandle cp(THREAD, k->constants());
1743
1744 // Ensure class is linked
1745 k->link_class(CHECK_NULL);
1746
1747 // Allocate result
1748 int num_fields;
1749
1750 if (publicOnly) {
1751 num_fields = 0;
1752 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1753 if (fs.access_flags().is_public()) ++num_fields;
1754 }
1755 } else {
1756 num_fields = k->java_fields_count();
1757 }
1758
1759 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1760 objArrayHandle result (THREAD, r);
1761
1762 int out_idx = 0;
1763 fieldDescriptor fd;
1764 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1765 if (!publicOnly || fs.access_flags().is_public()) {
1766 fd.reinitialize(k, fs.to_FieldInfo());
1767 oop field = Reflection::new_field(&fd, CHECK_NULL);
1768 result->obj_at_put(out_idx, field);
1769 ++out_idx;
1770 }
1771 }
1772 assert(out_idx == num_fields, "just checking");
1773 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1774 }
1775 JVM_END
1776
1777 // A class is a record if and only if it is final and a direct subclass of
1778 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1779 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1780 {
1781 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1782 if (k != nullptr && k->is_instance_klass()) {
1783 InstanceKlass* ik = InstanceKlass::cast(k);
1784 return ik->is_record();
1785 } else {
1786 return false;
1787 }
1788 }
1789 JVM_END
1790
1791 // Returns an array containing the components of the Record attribute,
1792 // or null if the attribute is not present.
1793 //
1794 // Note that this function returns the components of the Record attribute
1795 // even if the class is not a record.
1796 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1797 {
1798 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1799 assert(c->is_instance_klass(), "must be");
1800 InstanceKlass* ik = InstanceKlass::cast(c);
1801
1802 Array<RecordComponent*>* components = ik->record_components();
1803 if (components != nullptr) {
1804 JvmtiVMObjectAllocEventCollector oam;
1805 constantPoolHandle cp(THREAD, ik->constants());
1806 int length = components->length();
1807 assert(length >= 0, "unexpected record_components length");
1808 objArrayOop record_components =
1809 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1810 objArrayHandle components_h (THREAD, record_components);
1811
1812 for (int x = 0; x < length; x++) {
1813 RecordComponent* component = components->at(x);
1814 assert(component != nullptr, "unexpected null record component");
1815 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1816 components_h->obj_at_put(x, component_oop);
1817 }
1818 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1819 }
1820
1821 return nullptr;
1822 }
1823 JVM_END
1824
1825 static jobjectArray get_class_declared_methods_helper(
1826 JNIEnv *env,
1827 jclass ofClass, jboolean publicOnly,
1828 bool want_constructor,
1829 Klass* klass, TRAPS) {
1830
1831 JvmtiVMObjectAllocEventCollector oam;
1832
1833 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1834 // Exclude primitive types and array types
1835 if (java_lang_Class::is_primitive(ofMirror)
1836 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1837 // Return empty array
1838 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1839 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1840 }
1841
1842 InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1843
1844 // Ensure class is linked
1845 k->link_class(CHECK_NULL);
1846
1847 Array<Method*>* methods = k->methods();
1848 int methods_length = methods->length();
1849
1850 // Save original method_idnum in case of redefinition, which can change
1851 // the idnum of obsolete methods. The new method will have the same idnum
1852 // but if we refresh the methods array, the counts will be wrong.
1853 ResourceMark rm(THREAD);
1854 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1855 int num_methods = 0;
1856
1857 // Select methods matching the criteria.
1858 for (int i = 0; i < methods_length; i++) {
1859 Method* method = methods->at(i);
1860 if (want_constructor && !method->is_object_constructor()) {
1861 continue;
1862 }
1863 if (!want_constructor &&
1864 (method->is_object_constructor() || method->is_class_initializer() ||
1865 method->is_overpass())) {
1866 continue;
1867 }
1868 if (publicOnly && !method->is_public()) {
1869 continue;
1870 }
1871 idnums->push(method->method_idnum());
1872 ++num_methods;
1873 }
1874
1875 // Allocate result
1876 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1877 objArrayHandle result (THREAD, r);
1878
1879 // Now just put the methods that we selected above, but go by their idnum
1880 // in case of redefinition. The methods can be redefined at any safepoint,
1881 // so above when allocating the oop array and below when creating reflect
1882 // objects.
1883 for (int i = 0; i < num_methods; i++) {
1884 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1885 if (method.is_null()) {
1886 // Method may have been deleted and seems this API can handle null
1887 // Otherwise should probably put a method that throws NSME
1888 result->obj_at_put(i, nullptr);
1889 } else {
1890 oop m;
1891 if (want_constructor) {
1892 assert(method->is_object_constructor(), "must be");
1893 m = Reflection::new_constructor(method, CHECK_NULL);
1894 } else {
1895 m = Reflection::new_method(method, false, CHECK_NULL);
1896 }
1897 result->obj_at_put(i, m);
1898 }
1899 }
1900
1901 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1902 }
1903
1904 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1905 {
1906 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1907 /*want_constructor*/ false,
1908 vmClasses::reflect_Method_klass(), THREAD);
1909 }
1910 JVM_END
1911
1912 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1913 {
1914 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1915 /*want_constructor*/ true,
1916 vmClasses::reflect_Constructor_klass(), THREAD);
1917 }
1918 JVM_END
1919
1920 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1921 {
1922 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1923 assert(c->is_instance_klass(), "must be");
1924 InstanceKlass* ck = InstanceKlass::cast(c);
1925 Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1926 assert(m->is_instance_klass(), "must be");
1927 InstanceKlass* mk = InstanceKlass::cast(m);
1928 return ck->has_nestmate_access_to(mk, THREAD);
1929 }
1930 JVM_END
1931
1932 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1933 {
1934 // current is not a primitive or array class
1935 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1936 assert(c->is_instance_klass(), "must be");
1937 InstanceKlass* ck = InstanceKlass::cast(c);
1938 InstanceKlass* host = ck->nest_host(THREAD);
1939 return (jclass) (host == nullptr ? nullptr :
1940 JNIHandles::make_local(THREAD, host->java_mirror()));
1941 }
1942 JVM_END
1943
1944 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1945 {
1946 // current is not a primitive or array class
1947 ResourceMark rm(THREAD);
1948 Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1949 assert(c->is_instance_klass(), "must be");
1950 InstanceKlass* ck = InstanceKlass::cast(c);
1951 InstanceKlass* host = ck->nest_host(THREAD);
1952
1953 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1954 ck->external_name(), host->external_name());
1955 {
1956 JvmtiVMObjectAllocEventCollector oam;
1957 Array<u2>* members = host->nest_members();
1958 int length = members == nullptr ? 0 : members->length();
1959
1960 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1961
1962 // nest host is first in the array so make it one bigger
1963 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1964 length + 1, CHECK_NULL);
1965 objArrayHandle result(THREAD, r);
1966 result->obj_at_put(0, host->java_mirror());
1967 if (length != 0) {
1968 int count = 0;
1969 for (int i = 0; i < length; i++) {
1970 int cp_index = members->at(i);
1971 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1972 if (HAS_PENDING_EXCEPTION) {
1973 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1974 return nullptr; // propagate VMEs
1975 }
1976 if (log_is_enabled(Trace, class, nestmates)) {
1977 stringStream ss;
1978 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1979 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1980 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1981 log_trace(class, nestmates)("%s", ss.as_string());
1982 }
1983 CLEAR_PENDING_EXCEPTION;
1984 continue;
1985 }
1986 if (k->is_instance_klass()) {
1987 InstanceKlass* ik = InstanceKlass::cast(k);
1988 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1989 if (nest_host_k == host) {
1990 result->obj_at_put(count+1, k->java_mirror());
1991 count++;
1992 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1993 } else {
1994 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1995 ik->external_name(), nest_host_k->external_name());
1996 }
1997 } else {
1998 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1999 k->external_name());
2000 }
2001 }
2002 if (count < length) {
2003 // we had invalid entries so we need to compact the array
2004 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2005 length + 1, count + 1);
2006
2007 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2008 count + 1, CHECK_NULL);
2009 objArrayHandle result2(THREAD, r2);
2010 for (int i = 0; i < count + 1; i++) {
2011 result2->obj_at_put(i, result->obj_at(i));
2012 }
2013 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2014 }
2015 }
2016 else {
2017 assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2018 }
2019 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2020 }
2021 }
2022 JVM_END
2023
2024 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2025 {
2026 oop mirror = JNIHandles::resolve_non_null(current);
2027 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2028 Klass* c = java_lang_Class::as_Klass(mirror);
2029 assert(c->is_instance_klass(), "must be");
2030 InstanceKlass* ik = InstanceKlass::cast(c);
2031 ResourceMark rm(THREAD);
2032 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2033 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2034 if (ik->is_sealed()) {
2035 JvmtiVMObjectAllocEventCollector oam;
2036 Array<u2>* subclasses = ik->permitted_subclasses();
2037 int length = subclasses->length();
2038
2039 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2040
2041 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2042 length, CHECK_NULL);
2043 objArrayHandle result(THREAD, r);
2044 int count = 0;
2045 for (int i = 0; i < length; i++) {
2046 int cp_index = subclasses->at(i);
2047 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2048 if (HAS_PENDING_EXCEPTION) {
2049 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2050 return nullptr; // propagate VMEs
2051 }
2052 if (log_is_enabled(Trace, class, sealed)) {
2053 stringStream ss;
2054 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2055 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2056 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2057 log_trace(class, sealed)("%s", ss.as_string());
2058 }
2059
2060 CLEAR_PENDING_EXCEPTION;
2061 continue;
2062 }
2063 if (k->is_instance_klass()) {
2064 result->obj_at_put(count++, k->java_mirror());
2065 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2066 }
2067 }
2068 if (count < length) {
2069 // we had invalid entries so we need to compact the array
2070 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2071 count, CHECK_NULL);
2072 objArrayHandle result2(THREAD, r2);
2073 for (int i = 0; i < count; i++) {
2074 result2->obj_at_put(i, result->obj_at(i));
2075 }
2076 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2077 }
2078 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2079 } else {
2080 return nullptr;
2081 }
2082 }
2083 JVM_END
2084
2085 // Constant pool access //////////////////////////////////////////////////////////
2086
2087 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2088 {
2089 JvmtiVMObjectAllocEventCollector oam;
2090 oop mirror = JNIHandles::resolve_non_null(cls);
2091 // Return null for primitives and arrays
2092 if (!java_lang_Class::is_primitive(mirror)) {
2093 Klass* k = java_lang_Class::as_Klass(mirror);
2094 if (k->is_instance_klass()) {
2095 InstanceKlass* k_h = InstanceKlass::cast(k);
2096 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2097 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2098 return JNIHandles::make_local(THREAD, jcp());
2099 }
2100 }
2101 return nullptr;
2102 }
2103 JVM_END
2104
2105
2106 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2107 {
2108 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2109 return cp->length();
2110 }
2111 JVM_END
2112
2113
2114 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2115 {
2116 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2117 bounds_check(cp, index, CHECK_NULL);
2118 constantTag tag = cp->tag_at(index);
2119 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2120 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2121 }
2122 Klass* k = cp->klass_at(index, CHECK_NULL);
2123 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2124 }
2125 JVM_END
2126
2127 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2128 {
2129 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2130 bounds_check(cp, index, CHECK_NULL);
2131 constantTag tag = cp->tag_at(index);
2132 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2133 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2134 }
2135 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2136 if (k == nullptr) return nullptr;
2137 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2138 }
2139 JVM_END
2140
2141 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2142 constantTag tag = cp->tag_at(index);
2143 if (!tag.is_method() && !tag.is_interface_method()) {
2144 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2145 }
2146 int klass_ref = cp->uncached_klass_ref_index_at(index);
2147 Klass* k_o;
2148 if (force_resolution) {
2149 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2150 } else {
2151 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2152 if (k_o == nullptr) return nullptr;
2153 }
2154 InstanceKlass* k = InstanceKlass::cast(k_o);
2155 Symbol* name = cp->uncached_name_ref_at(index);
2156 Symbol* sig = cp->uncached_signature_ref_at(index);
2157 methodHandle m (THREAD, k->find_method(name, sig));
2158 if (m.is_null()) {
2159 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2160 }
2161 oop method;
2162 if (m->is_object_constructor()) {
2163 method = Reflection::new_constructor(m, CHECK_NULL);
2164 } else {
2165 method = Reflection::new_method(m, true, CHECK_NULL);
2166 }
2167 return JNIHandles::make_local(THREAD, method);
2168 }
2169
2170 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2171 {
2172 JvmtiVMObjectAllocEventCollector oam;
2173 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2174 bounds_check(cp, index, CHECK_NULL);
2175 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2176 return res;
2177 }
2178 JVM_END
2179
2180 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2181 {
2182 JvmtiVMObjectAllocEventCollector oam;
2183 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2184 bounds_check(cp, index, CHECK_NULL);
2185 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2186 return res;
2187 }
2188 JVM_END
2189
2190 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2191 constantTag tag = cp->tag_at(index);
2192 if (!tag.is_field()) {
2193 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2194 }
2195 int klass_ref = cp->uncached_klass_ref_index_at(index);
2196 Klass* k_o;
2197 if (force_resolution) {
2198 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2199 } else {
2200 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2201 if (k_o == nullptr) return nullptr;
2202 }
2203 InstanceKlass* k = InstanceKlass::cast(k_o);
2204 Symbol* name = cp->uncached_name_ref_at(index);
2205 Symbol* sig = cp->uncached_signature_ref_at(index);
2206 fieldDescriptor fd;
2207 Klass* target_klass = k->find_field(name, sig, &fd);
2208 if (target_klass == nullptr) {
2209 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2210 }
2211 oop field = Reflection::new_field(&fd, CHECK_NULL);
2212 return JNIHandles::make_local(THREAD, field);
2213 }
2214
2215 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2216 {
2217 JvmtiVMObjectAllocEventCollector oam;
2218 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2219 bounds_check(cp, index, CHECK_NULL);
2220 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2221 return res;
2222 }
2223 JVM_END
2224
2225 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2226 {
2227 JvmtiVMObjectAllocEventCollector oam;
2228 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2229 bounds_check(cp, index, CHECK_NULL);
2230 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2231 return res;
2232 }
2233 JVM_END
2234
2235 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2236 {
2237 JvmtiVMObjectAllocEventCollector oam;
2238 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2239 bounds_check(cp, index, CHECK_NULL);
2240 constantTag tag = cp->tag_at(index);
2241 if (!tag.is_field_or_method()) {
2242 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2243 }
2244 int klass_ref = cp->uncached_klass_ref_index_at(index);
2245 Symbol* klass_name = cp->klass_name_at(klass_ref);
2246 Symbol* member_name = cp->uncached_name_ref_at(index);
2247 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2248 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2249 objArrayHandle dest(THREAD, dest_o);
2250 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2251 dest->obj_at_put(0, str());
2252 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2253 dest->obj_at_put(1, str());
2254 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2255 dest->obj_at_put(2, str());
2256 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2257 }
2258 JVM_END
2259
2260 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2261 {
2262 JvmtiVMObjectAllocEventCollector oam;
2263 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2264 bounds_check(cp, index, CHECK_0);
2265 constantTag tag = cp->tag_at(index);
2266 if (!tag.is_field_or_method()) {
2267 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2268 }
2269 return (jint) cp->uncached_klass_ref_index_at(index);
2270 }
2271 JVM_END
2272
2273 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2274 {
2275 JvmtiVMObjectAllocEventCollector oam;
2276 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2277 bounds_check(cp, index, CHECK_0);
2278 constantTag tag = cp->tag_at(index);
2279 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2280 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2281 }
2282 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2283 }
2284 JVM_END
2285
2286 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2287 {
2288 JvmtiVMObjectAllocEventCollector oam;
2289 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2290 bounds_check(cp, index, CHECK_NULL);
2291 constantTag tag = cp->tag_at(index);
2292 if (!tag.is_name_and_type()) {
2293 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2294 }
2295 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2296 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2297 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2298 objArrayHandle dest(THREAD, dest_o);
2299 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2300 dest->obj_at_put(0, str());
2301 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2302 dest->obj_at_put(1, str());
2303 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2304 }
2305 JVM_END
2306
2307 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2308 {
2309 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2310 bounds_check(cp, index, CHECK_0);
2311 constantTag tag = cp->tag_at(index);
2312 if (!tag.is_int()) {
2313 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2314 }
2315 return cp->int_at(index);
2316 }
2317 JVM_END
2318
2319 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2320 {
2321 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2322 bounds_check(cp, index, CHECK_(0L));
2323 constantTag tag = cp->tag_at(index);
2324 if (!tag.is_long()) {
2325 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2326 }
2327 return cp->long_at(index);
2328 }
2329 JVM_END
2330
2331 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2332 {
2333 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2334 bounds_check(cp, index, CHECK_(0.0f));
2335 constantTag tag = cp->tag_at(index);
2336 if (!tag.is_float()) {
2337 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2338 }
2339 return cp->float_at(index);
2340 }
2341 JVM_END
2342
2343 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2344 {
2345 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2346 bounds_check(cp, index, CHECK_(0.0));
2347 constantTag tag = cp->tag_at(index);
2348 if (!tag.is_double()) {
2349 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2350 }
2351 return cp->double_at(index);
2352 }
2353 JVM_END
2354
2355 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2356 {
2357 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2358 bounds_check(cp, index, CHECK_NULL);
2359 constantTag tag = cp->tag_at(index);
2360 if (!tag.is_string()) {
2361 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2362 }
2363 oop str = cp->string_at(index, CHECK_NULL);
2364 return (jstring) JNIHandles::make_local(THREAD, str);
2365 }
2366 JVM_END
2367
2368 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2369 {
2370 JvmtiVMObjectAllocEventCollector oam;
2371 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2372 bounds_check(cp, index, CHECK_NULL);
2373 constantTag tag = cp->tag_at(index);
2374 if (!tag.is_symbol()) {
2375 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2376 }
2377 Symbol* sym = cp->symbol_at(index);
2378 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2379 return (jstring) JNIHandles::make_local(THREAD, str());
2380 }
2381 JVM_END
2382
2383 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2384 {
2385 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2386 bounds_check(cp, index, CHECK_0);
2387 constantTag tag = cp->tag_at(index);
2388 jbyte result = tag.value();
2389 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2390 // they are changed to the corresponding tags from the JVM spec, so that java code in
2391 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2392 if (tag.is_klass_or_reference()) {
2393 result = JVM_CONSTANT_Class;
2394 } else if (tag.is_string_index()) {
2395 result = JVM_CONSTANT_String;
2396 } else if (tag.is_method_type_in_error()) {
2397 result = JVM_CONSTANT_MethodType;
2398 } else if (tag.is_method_handle_in_error()) {
2399 result = JVM_CONSTANT_MethodHandle;
2400 } else if (tag.is_dynamic_constant_in_error()) {
2401 result = JVM_CONSTANT_Dynamic;
2402 }
2403 return result;
2404 }
2405 JVM_END
2406
2407 // Assertion support. //////////////////////////////////////////////////////////
2408
2409 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2410 assert(cls != nullptr, "bad class");
2411
2412 oop r = JNIHandles::resolve(cls);
2413 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2414 if (java_lang_Class::is_primitive(r)) return false;
2415
2416 Klass* k = java_lang_Class::as_Klass(r);
2417 assert(k->is_instance_klass(), "must be an instance klass");
2418 if (!k->is_instance_klass()) return false;
2419
2420 ResourceMark rm(THREAD);
2421 const char* name = k->name()->as_C_string();
2422 bool system_class = k->class_loader() == nullptr;
2423 return JavaAssertions::enabled(name, system_class);
2424
2425 JVM_END
2426
2427
2428 // Return a new AssertionStatusDirectives object with the fields filled in with
2429 // command-line assertion arguments (i.e., -ea, -da).
2430 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2431 JvmtiVMObjectAllocEventCollector oam;
2432 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2433 return JNIHandles::make_local(THREAD, asd);
2434 JVM_END
2435
2436 // Verification ////////////////////////////////////////////////////////////////////////////////
2437
2438 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2439
2440 // RedefineClasses support: bug 6214132 caused verification to fail.
2441 // All functions from this section should call the jvmtiThreadSate function:
2442 // Klass* class_to_verify_considering_redefinition(Klass* klass).
2443 // The function returns a Klass* of the _scratch_class if the verifier
2444 // was invoked in the middle of the class redefinition.
2445 // Otherwise it returns its argument value which is the _the_class Klass*.
2446 // Please, refer to the description in the jvmtiThreadState.hpp.
2447
2448 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2449 oop mirror = JNIHandles::resolve_non_null(cls);
2450 if (java_lang_Class::is_primitive(mirror)) {
2451 return JNI_FALSE;
2452 }
2453 Klass* k = java_lang_Class::as_Klass(mirror);
2454 // This isn't necessary since answer is the same since redefinition
2455 // has already checked this matches for the scratch class.
2456 // k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2457 jboolean result = k->is_interface();
2458 assert(!result || k->is_instance_klass(),
2459 "all interfaces are instance types");
2460 return result;
2461 JVM_END
2462
2463
2464 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2465 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2466 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2467 return k->name()->as_utf8();
2468 JVM_END
2469
2470
2471 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2472 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2473 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2474 // types will have length zero if this is not an InstanceKlass
2475 // (length is determined by call to JVM_GetClassCPEntriesCount)
2476 if (k->is_instance_klass()) {
2477 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2478 for (int index = cp->length() - 1; index >= 0; index--) {
2479 constantTag tag = cp->tag_at(index);
2480 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2481 }
2482 }
2483 JVM_END
2484
2485
2486 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2487 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2488 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2489 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2490 JVM_END
2491
2492
2493 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2494 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2495 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2496 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2497 JVM_END
2498
2499
2500 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2501 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2502 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2503 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2504 JVM_END
2505
2506
2507 // The following methods, used for the verifier, are never called with
2508 // array klasses, so a direct cast to InstanceKlass is safe.
2509 // Typically, these methods are called in a loop with bounds determined
2510 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2511 // zero for arrays.
2512 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2513 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2514 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2515 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2516 int length = method->checked_exceptions_length();
2517 if (length > 0) {
2518 CheckedExceptionElement* table= method->checked_exceptions_start();
2519 for (int i = 0; i < length; i++) {
2520 exceptions[i] = table[i].class_cp_index;
2521 }
2522 }
2523 JVM_END
2524
2525
2526 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2527 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2528 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2529 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2530 return method->checked_exceptions_length();
2531 JVM_END
2532
2533
2534 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2535 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2536 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2537 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2538 memcpy(code, method->code_base(), method->code_size());
2539 JVM_END
2540
2541
2542 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2543 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2544 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2545 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2546 return method->code_size();
2547 JVM_END
2548
2549
2550 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2551 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2552 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2553 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2554 ExceptionTable extable(method);
2555 entry->start_pc = extable.start_pc(entry_index);
2556 entry->end_pc = extable.end_pc(entry_index);
2557 entry->handler_pc = extable.handler_pc(entry_index);
2558 entry->catchType = extable.catch_type_index(entry_index);
2559 JVM_END
2560
2561
2562 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2563 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2564 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2565 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2566 return method->exception_table_length();
2567 JVM_END
2568
2569
2570 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2571 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2572 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2573 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2574 return method->access_flags().as_method_flags();
2575 JVM_END
2576
2577
2578 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2579 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2580 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2581 return InstanceKlass::cast(k)->field_access_flags(field_index);
2582 JVM_END
2583
2584
2585 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(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->max_locals();
2590 JVM_END
2591
2592
2593 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_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 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2597 return method->size_of_parameters();
2598 JVM_END
2599
2600
2601 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2602 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2603 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2604 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2605 return method->verifier_max_stack();
2606 JVM_END
2607
2608
2609 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2610 ResourceMark rm(THREAD);
2611 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2612 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2613 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2614 return method->is_object_constructor();
2615 JVM_END
2616
2617
2618 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2619 ResourceMark rm(THREAD);
2620 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2621 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2622 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2623 return method->is_overpass();
2624 JVM_END
2625
2626 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2627 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2628 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2629 Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2630 return method->name()->as_utf8();
2631 JVM_END
2632
2633
2634 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
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->signature()->as_utf8();
2639 JVM_END
2640
2641 /**
2642 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2643 * read entries in the constant pool. Since the old verifier always
2644 * works on a copy of the code, it will not see any rewriting that
2645 * may possibly occur in the middle of verification. So it is important
2646 * that nothing it calls tries to use the cpCache instead of the raw
2647 * constant pool, so we must use cp->uncached_x methods when appropriate.
2648 */
2649 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_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 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2653 switch (cp->tag_at(cp_index).value()) {
2654 case JVM_CONSTANT_Fieldref:
2655 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2656 default:
2657 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2658 }
2659 ShouldNotReachHere();
2660 return nullptr;
2661 JVM_END
2662
2663
2664 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(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_InterfaceMethodref:
2670 case JVM_CONSTANT_Methodref:
2671 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2672 default:
2673 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2674 }
2675 ShouldNotReachHere();
2676 return nullptr;
2677 JVM_END
2678
2679
2680 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2681 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2682 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2683 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2684 switch (cp->tag_at(cp_index).value()) {
2685 case JVM_CONSTANT_InterfaceMethodref:
2686 case JVM_CONSTANT_Methodref:
2687 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2688 default:
2689 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2690 }
2691 ShouldNotReachHere();
2692 return nullptr;
2693 JVM_END
2694
2695
2696 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2697 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2698 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2699 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2700 switch (cp->tag_at(cp_index).value()) {
2701 case JVM_CONSTANT_Fieldref:
2702 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2703 default:
2704 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2705 }
2706 ShouldNotReachHere();
2707 return nullptr;
2708 JVM_END
2709
2710
2711 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(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 Symbol* classname = cp->klass_name_at(cp_index);
2716 return classname->as_utf8();
2717 JVM_END
2718
2719
2720 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2721 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2722 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2723 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2724 switch (cp->tag_at(cp_index).value()) {
2725 case JVM_CONSTANT_Fieldref: {
2726 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2727 Symbol* classname = cp->klass_name_at(class_index);
2728 return classname->as_utf8();
2729 }
2730 default:
2731 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2732 }
2733 ShouldNotReachHere();
2734 return nullptr;
2735 JVM_END
2736
2737
2738 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2739 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2740 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2741 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2742 switch (cp->tag_at(cp_index).value()) {
2743 case JVM_CONSTANT_Methodref:
2744 case JVM_CONSTANT_InterfaceMethodref: {
2745 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2746 Symbol* classname = cp->klass_name_at(class_index);
2747 return classname->as_utf8();
2748 }
2749 default:
2750 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2751 }
2752 ShouldNotReachHere();
2753 return nullptr;
2754 JVM_END
2755
2756
2757 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2758 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2759 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2760 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2761 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2762 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2763 ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2764 switch (cp->tag_at(cp_index).value()) {
2765 case JVM_CONSTANT_Fieldref: {
2766 Symbol* name = cp->uncached_name_ref_at(cp_index);
2767 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2768 InstanceKlass* ik = InstanceKlass::cast(k_called);
2769 for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2770 if (fs.name() == name && fs.signature() == signature) {
2771 return fs.access_flags().as_field_flags();
2772 }
2773 }
2774 return -1;
2775 }
2776 default:
2777 fatal("JVM_GetCPFieldModifiers: illegal constant");
2778 }
2779 ShouldNotReachHere();
2780 return 0;
2781 JVM_END
2782
2783
2784 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2785 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2786 Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2787 k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2788 k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2789 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2790 switch (cp->tag_at(cp_index).value()) {
2791 case JVM_CONSTANT_Methodref:
2792 case JVM_CONSTANT_InterfaceMethodref: {
2793 Symbol* name = cp->uncached_name_ref_at(cp_index);
2794 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2795 Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2796 int methods_count = methods->length();
2797 for (int i = 0; i < methods_count; i++) {
2798 Method* method = methods->at(i);
2799 if (method->name() == name && method->signature() == signature) {
2800 return method->access_flags().as_method_flags();
2801 }
2802 }
2803 return -1;
2804 }
2805 default:
2806 fatal("JVM_GetCPMethodModifiers: illegal constant");
2807 }
2808 ShouldNotReachHere();
2809 return 0;
2810 JVM_END
2811
2812
2813 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2814
2815 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2816 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2817 JVM_END
2818
2819
2820 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2821 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2822 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2823 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2824 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2825 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2826 JVM_END
2827
2828 // Printing support //////////////////////////////////////////////////
2829 extern "C" {
2830
2831 ATTRIBUTE_PRINTF(3, 0)
2832 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2833 // Reject count values that are negative signed values converted to
2834 // unsigned; see bug 4399518, 4417214
2835 if ((intptr_t)count <= 0) return -1;
2836
2837 int result = os::vsnprintf(str, count, fmt, args);
2838 if (result > 0 && (size_t)result >= count) {
2839 result = -1;
2840 }
2841
2842 return result;
2843 }
2844
2845 ATTRIBUTE_PRINTF(3, 4)
2846 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2847 va_list args;
2848 int len;
2849 va_start(args, fmt);
2850 len = jio_vsnprintf(str, count, fmt, args);
2851 va_end(args);
2852 return len;
2853 }
2854
2855 ATTRIBUTE_PRINTF(2, 3)
2856 int jio_fprintf(FILE* f, const char *fmt, ...) {
2857 int len;
2858 va_list args;
2859 va_start(args, fmt);
2860 len = jio_vfprintf(f, fmt, args);
2861 va_end(args);
2862 return len;
2863 }
2864
2865 ATTRIBUTE_PRINTF(2, 0)
2866 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2867 if (Arguments::vfprintf_hook() != nullptr) {
2868 return Arguments::vfprintf_hook()(f, fmt, args);
2869 } else {
2870 return vfprintf(f, fmt, args);
2871 }
2872 }
2873
2874 ATTRIBUTE_PRINTF(1, 2)
2875 JNIEXPORT int jio_printf(const char *fmt, ...) {
2876 int len;
2877 va_list args;
2878 va_start(args, fmt);
2879 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2880 va_end(args);
2881 return len;
2882 }
2883
2884 // HotSpot specific jio method
2885 void jio_print(const char* s, size_t len) {
2886 // Try to make this function as atomic as possible.
2887 if (Arguments::vfprintf_hook() != nullptr) {
2888 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2889 } else {
2890 // Make an unused local variable to avoid warning from gcc compiler.
2891 bool dummy = os::write(defaultStream::output_fd(), s, len);
2892 }
2893 }
2894
2895 } // Extern C
2896
2897 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2898
2899 // In most of the JVM thread support functions we need to access the
2900 // thread through a ThreadsListHandle to prevent it from exiting and
2901 // being reclaimed while we try to operate on it. The exceptions to this
2902 // rule are when operating on the current thread, or if the monitor of
2903 // the target java.lang.Thread is locked at the Java level - in both
2904 // cases the target cannot exit.
2905
2906 static void thread_entry(JavaThread* thread, TRAPS) {
2907 HandleMark hm(THREAD);
2908 Handle obj(THREAD, thread->threadObj());
2909 JavaValue result(T_VOID);
2910 JavaCalls::call_virtual(&result,
2911 obj,
2912 vmClasses::Thread_klass(),
2913 vmSymbols::run_method_name(),
2914 vmSymbols::void_method_signature(),
2915 THREAD);
2916 }
2917
2918
2919 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2920 #if INCLUDE_CDS
2921 if (CDSConfig::allow_only_single_java_thread()) {
2922 // During java -Xshare:dump, if we allow multiple Java threads to
2923 // execute in parallel, symbols and classes may be loaded in
2924 // random orders which will make the resulting CDS archive
2925 // non-deterministic.
2926 //
2927 // Lucikly, during java -Xshare:dump, it's important to run only
2928 // the code in the main Java thread (which is NOT started here) that
2929 // creates the module graph, etc. It's safe to not start the other
2930 // threads which are launched by class static initializers
2931 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2932 if (log_is_enabled(Info, aot)) {
2933 ResourceMark rm;
2934 oop t = JNIHandles::resolve_non_null(jthread);
2935 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2936 }
2937 return;
2938 }
2939 #endif
2940 JavaThread *native_thread = nullptr;
2941
2942 // We cannot hold the Threads_lock when we throw an exception,
2943 // due to rank ordering issues. Example: we might need to grab the
2944 // Heap_lock while we construct the exception.
2945 bool throw_illegal_thread_state = false;
2946
2947 // We must release the Threads_lock before we can post a jvmti event
2948 // in Thread::start.
2949 {
2950 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2951 // Ensure that the C++ Thread and OSThread structures aren't freed before
2952 // we operate.
2953 MutexLocker ml(Threads_lock);
2954
2955 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2956 // re-starting an already started thread, so we should usually find
2957 // that the JavaThread is null. However for a JNI attached thread
2958 // there is a small window between the Thread object being created
2959 // (with its JavaThread set) and the update to its threadStatus, so we
2960 // have to check for this
2961 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2962 throw_illegal_thread_state = true;
2963 } else {
2964 jlong size =
2965 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2966 // Allocate the C++ Thread structure and create the native thread. The
2967 // stack size retrieved from java is 64-bit signed, but the constructor takes
2968 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2969 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2970 // - Avoid passing negative values which would result in really large stacks.
2971 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2972 size_t sz = size > 0 ? (size_t) size : 0;
2973 native_thread = new JavaThread(&thread_entry, sz);
2974
2975 // At this point it may be possible that no osthread was created for the
2976 // JavaThread due to lack of memory. Check for this situation and throw
2977 // an exception if necessary. Eventually we may want to change this so
2978 // that we only grab the lock if the thread was created successfully -
2979 // then we can also do this check and throw the exception in the
2980 // JavaThread constructor.
2981 if (native_thread->osthread() != nullptr) {
2982 // Note: the current thread is not being used within "prepare".
2983 native_thread->prepare(jthread);
2984 }
2985 }
2986 }
2987
2988 if (throw_illegal_thread_state) {
2989 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2990 }
2991
2992 assert(native_thread != nullptr, "Starting null thread?");
2993
2994 if (native_thread->osthread() == nullptr) {
2995 ResourceMark rm(thread);
2996 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2997 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2998 // No one should hold a reference to the 'native_thread'.
2999 native_thread->smr_delete();
3000 if (JvmtiExport::should_post_resource_exhausted()) {
3001 JvmtiExport::post_resource_exhausted(
3002 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3003 os::native_thread_creation_failed_msg());
3004 }
3005 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3006 os::native_thread_creation_failed_msg());
3007 }
3008
3009 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3010
3011 Thread::start(native_thread);
3012
3013 JVM_END
3014
3015
3016 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3017 ThreadsListHandle tlh(thread);
3018 oop java_thread = nullptr;
3019 JavaThread* receiver = nullptr;
3020 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3021 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3022
3023 if (is_alive) {
3024 // jthread refers to a live JavaThread.
3025 Thread::set_priority(receiver, (ThreadPriority)prio);
3026 }
3027 // Implied else: If the JavaThread hasn't started yet, then the
3028 // priority set in the java.lang.Thread object above will be pushed
3029 // down when it does start.
3030 JVM_END
3031
3032
3033 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3034 HOTSPOT_THREAD_YIELD();
3035 os::naked_yield();
3036 JVM_END
3037
3038 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3039 if (nanos < 0) {
3040 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3041 }
3042
3043 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3044 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3045 }
3046
3047 // Save current thread state and restore it at the end of this block.
3048 // And set new thread state to SLEEPING.
3049 JavaThreadSleepState jtss(thread);
3050
3051 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3052
3053 if (nanos == 0) {
3054 os::naked_yield();
3055 } else {
3056 ThreadState old_state = thread->osthread()->get_state();
3057 thread->osthread()->set_state(SLEEPING);
3058 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3059 // An asynchronous exception could have been thrown on
3060 // us while we were sleeping. We do not overwrite those.
3061 if (!HAS_PENDING_EXCEPTION) {
3062 HOTSPOT_THREAD_SLEEP_END(1);
3063 if (!thread->has_async_exception_condition()) {
3064 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3065 // to properly restore the thread state. That's likely wrong.
3066 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3067 }
3068 }
3069 }
3070 thread->osthread()->set_state(old_state);
3071 }
3072 HOTSPOT_THREAD_SLEEP_END(0);
3073 JVM_END
3074
3075 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3076 oop jthread = thread->threadObj();
3077 assert(jthread != nullptr, "no current carrier thread!");
3078 return JNIHandles::make_local(THREAD, jthread);
3079 JVM_END
3080
3081 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3082 oop theThread = thread->vthread();
3083 assert(theThread != (oop)nullptr, "no current thread!");
3084 return JNIHandles::make_local(THREAD, theThread);
3085 JVM_END
3086
3087 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3088 jobject theThread))
3089 oop threadObj = JNIHandles::resolve(theThread);
3090 thread->set_vthread(threadObj);
3091
3092 // Set _monitor_owner_id of new current Thread
3093 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3094
3095 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3096 JVM_END
3097
3098 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3099 return ThreadIdentifier::unsafe_offset();
3100 JVM_END
3101
3102 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3103 ThreadsListHandle tlh(thread);
3104 JavaThread* receiver = nullptr;
3105 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3106 if (is_alive) {
3107 // jthread refers to a live JavaThread.
3108 receiver->interrupt();
3109 }
3110 JVM_END
3111
3112 // Return true iff the current thread has locked the object passed in
3113
3114 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3115 if (obj == nullptr) {
3116 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3117 }
3118 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3119 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3120 JVM_END
3121
3122 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3123 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3124 return JNIHandles::make_local(THREAD, trace);
3125 JVM_END
3126
3127 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3128 #if INCLUDE_JVMTI
3129 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3130 return JNIHandles::make_local(THREAD, snapshot);
3131 #else
3132 THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
3133 #endif
3134 JVM_END
3135
3136 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3137 // We don't use a ThreadsListHandle here because the current thread
3138 // must be alive.
3139 oop java_thread = JNIHandles::resolve_non_null(jthread);
3140 JavaThread* thr = java_lang_Thread::thread(java_thread);
3141 if (thread == thr && !thr->has_attached_via_jni()) {
3142 // Thread naming is only supported for the current thread and
3143 // we don't set the name of an attached thread to avoid stepping
3144 // on other programs.
3145 ResourceMark rm(thread);
3146 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3147 os::set_native_thread_name(thread_name);
3148 }
3149 JVM_END
3150
3151 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3152 oop theCache = thread->scopedValueCache();
3153 return JNIHandles::make_local(THREAD, theCache);
3154 JVM_END
3155
3156 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3157 jobject theCache))
3158 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3159 thread->set_scopedValueCache(objs);
3160 JVM_END
3161
3162
3163 // java.lang.Package ////////////////////////////////////////////////////////////////
3164
3165
3166 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3167 ResourceMark rm(THREAD);
3168 JvmtiVMObjectAllocEventCollector oam;
3169 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3170 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3171 return (jstring) JNIHandles::make_local(THREAD, result);
3172 JVM_END
3173
3174
3175 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3176 JvmtiVMObjectAllocEventCollector oam;
3177 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3178 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3179 JVM_END
3180
3181
3182 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3183
3184
3185 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3186 MonitorLocker ml(Heap_lock);
3187 oop ref = Universe::reference_pending_list();
3188 if (ref != nullptr) {
3189 Universe::clear_reference_pending_list();
3190 }
3191 return JNIHandles::make_local(THREAD, ref);
3192 JVM_END
3193
3194 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3195 MonitorLocker ml(Heap_lock);
3196 return Universe::has_reference_pending_list();
3197 JVM_END
3198
3199 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3200 MonitorLocker ml(Heap_lock);
3201 while (!Universe::has_reference_pending_list()) {
3202 ml.wait();
3203 }
3204 JVM_END
3205
3206 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3207 oop ref_oop = JNIHandles::resolve_non_null(ref);
3208 // PhantomReference has its own implementation of get().
3209 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3210 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3211 return JNIHandles::make_local(THREAD, referent);
3212 JVM_END
3213
3214 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3215 oop ref_oop = JNIHandles::resolve_non_null(ref);
3216 // PhantomReference has its own implementation of refersTo().
3217 // See: JVM_PhantomReferenceRefersTo
3218 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3219 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3220 return referent == JNIHandles::resolve(o);
3221 JVM_END
3222
3223 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3224 oop ref_oop = JNIHandles::resolve_non_null(ref);
3225 // FinalReference has it's own implementation of clear().
3226 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3227 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3228 // If the referent has already been cleared then done.
3229 // However, if the referent is dead but has not yet been cleared by
3230 // concurrent reference processing, it should NOT be cleared here.
3231 // Instead, clearing should be left to the GC. Clearing it here could
3232 // detectably lose an expected notification, which is impossible with
3233 // STW reference processing. The clearing in enqueue() doesn't have
3234 // this problem, since the enqueue covers the notification, but it's not
3235 // worth the effort to handle that case specially.
3236 return;
3237 }
3238 java_lang_ref_Reference::clear_referent(ref_oop);
3239 JVM_END
3240
3241
3242 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3243
3244
3245 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3246 oop ref_oop = JNIHandles::resolve_non_null(ref);
3247 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3248 return referent == JNIHandles::resolve(o);
3249 JVM_END
3250
3251
3252 // ObjectInputStream ///////////////////////////////////////////////////////////////
3253
3254 // Return the first user-defined class loader up the execution stack, or null
3255 // if only code from the bootstrap or platform class loader is on the stack.
3256
3257 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3258 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3259 InstanceKlass* ik = vfst.method()->method_holder();
3260 oop loader = ik->class_loader();
3261 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3262 return JNIHandles::make_local(THREAD, loader);
3263 }
3264 }
3265 return nullptr;
3266 JVM_END
3267
3268
3269 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3270
3271
3272 // resolve array handle and check arguments
3273 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3274 if (arr == nullptr) {
3275 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3276 }
3277 oop a = JNIHandles::resolve_non_null(arr);
3278 if (!a->is_array()) {
3279 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3280 } else if (type_array_only && !a->is_typeArray()) {
3281 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3282 }
3283 return arrayOop(a);
3284 }
3285
3286
3287 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3288 arrayOop a = check_array(env, arr, false, CHECK_0);
3289 return a->length();
3290 JVM_END
3291
3292
3293 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3294 JvmtiVMObjectAllocEventCollector oam;
3295 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3296 jvalue value;
3297 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3298 oop box = Reflection::box(&value, type, CHECK_NULL);
3299 return JNIHandles::make_local(THREAD, box);
3300 JVM_END
3301
3302
3303 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3304 jvalue value;
3305 value.i = 0; // to initialize value before getting used in CHECK
3306 arrayOop a = check_array(env, arr, true, CHECK_(value));
3307 assert(a->is_typeArray(), "just checking");
3308 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3309 BasicType wide_type = (BasicType) wCode;
3310 if (type != wide_type) {
3311 Reflection::widen(&value, type, wide_type, CHECK_(value));
3312 }
3313 return value;
3314 JVM_END
3315
3316
3317 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3318 arrayOop a = check_array(env, arr, false, CHECK);
3319 oop box = JNIHandles::resolve(val);
3320 jvalue value;
3321 value.i = 0; // to initialize value before getting used in CHECK
3322 BasicType value_type;
3323 if (a->is_objArray()) {
3324 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3325 value_type = Reflection::unbox_for_regular_object(box, &value);
3326 } else {
3327 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3328 }
3329 Reflection::array_set(&value, a, index, value_type, CHECK);
3330 JVM_END
3331
3332
3333 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3334 arrayOop a = check_array(env, arr, true, CHECK);
3335 assert(a->is_typeArray(), "just checking");
3336 BasicType value_type = (BasicType) vCode;
3337 Reflection::array_set(&v, a, index, value_type, CHECK);
3338 JVM_END
3339
3340
3341 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3342 JvmtiVMObjectAllocEventCollector oam;
3343 oop element_mirror = JNIHandles::resolve(eltClass);
3344 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3345 return JNIHandles::make_local(THREAD, result);
3346 JVM_END
3347
3348
3349 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3350 JvmtiVMObjectAllocEventCollector oam;
3351 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3352 oop element_mirror = JNIHandles::resolve(eltClass);
3353 assert(dim_array->is_typeArray(), "just checking");
3354 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3355 return JNIHandles::make_local(THREAD, result);
3356 JVM_END
3357
3358
3359 // Library support ///////////////////////////////////////////////////////////////////////////
3360
3361 JVM_LEAF(void*, JVM_LoadZipLibrary())
3362 return ZipLibrary::handle();
3363 JVM_END
3364
3365 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3366 //%note jvm_ct
3367 char ebuf[1024];
3368 void *load_result;
3369 {
3370 ThreadToNativeFromVM ttnfvm(thread);
3371 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3372 }
3373 if (load_result == nullptr) {
3374 if (throwException) {
3375 char msg[1024];
3376 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3377 // Since 'ebuf' may contain a string encoded using
3378 // platform encoding scheme, we need to pass
3379 // Exceptions::unsafe_to_utf8 to the new_exception method
3380 // as the last argument. See bug 6367357.
3381 Handle h_exception =
3382 Exceptions::new_exception(thread,
3383 vmSymbols::java_lang_UnsatisfiedLinkError(),
3384 msg, Exceptions::unsafe_to_utf8);
3385
3386 THROW_HANDLE_NULL(h_exception);
3387 } else {
3388 log_info(library)("Failed to load library %s", name);
3389 return load_result;
3390 }
3391 }
3392 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3393 return load_result;
3394 JVM_END
3395
3396
3397 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3398 os::dll_unload(handle);
3399 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3400 JVM_END
3401
3402
3403 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3404 void* find_result = os::dll_lookup(handle, name);
3405 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3406 find_result != nullptr ? "Found" : "Failed to find",
3407 name, p2i(handle));
3408 return find_result;
3409 JVM_END
3410
3411
3412 // JNI version ///////////////////////////////////////////////////////////////////////////////
3413
3414 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3415 return Threads::is_supported_jni_version_including_1_1(version);
3416 JVM_END
3417
3418
3419 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3420 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3421 JVM_END
3422
3423 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3424 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3425 JVM_END
3426
3427 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3428 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3429 JVM_END
3430
3431 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3432 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3433 JVM_END
3434
3435 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3436 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3437 JVM_END
3438
3439 // String support ///////////////////////////////////////////////////////////////////////////
3440
3441 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3442 JvmtiVMObjectAllocEventCollector oam;
3443 if (str == nullptr) return nullptr;
3444 oop string = JNIHandles::resolve_non_null(str);
3445 oop result = StringTable::intern(string, CHECK_NULL);
3446 return (jstring) JNIHandles::make_local(THREAD, result);
3447 JVM_END
3448
3449
3450 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3451
3452 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3453 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3454 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3455 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3456 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3457 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3458
3459
3460 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3461 VM_Exit::block_if_vm_exited();
3462 return new PlatformMutex();
3463 }
3464
3465
3466 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3467 VM_Exit::block_if_vm_exited();
3468 delete ((PlatformMutex*) mon);
3469 }
3470
3471
3472 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3473 VM_Exit::block_if_vm_exited();
3474 ((PlatformMutex*) mon)->lock();
3475 return 0;
3476 }
3477
3478
3479 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3480 VM_Exit::block_if_vm_exited();
3481 ((PlatformMutex*) mon)->unlock();
3482 }
3483
3484
3485 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3486
3487 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3488 Handle loader, jboolean throwError, TRAPS) {
3489 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3490
3491 // Check if we should initialize the class
3492 if (init && klass->is_instance_klass()) {
3493 klass->initialize(CHECK_NULL);
3494 }
3495 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3496 }
3497
3498
3499 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3500
3501 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3502 Handle method_handle;
3503 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3504 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3505 Handle receiver(THREAD, JNIHandles::resolve(obj));
3506 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3507 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3508
3509 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3510 jobject res = JNIHandles::make_local(THREAD, result);
3511 if (JvmtiExport::should_post_vm_object_alloc()) {
3512 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3513 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3514 if (java_lang_Class::is_primitive(ret_type)) {
3515 // Only for primitive type vm allocates memory for java object.
3516 // See box() method.
3517 JvmtiExport::post_vm_object_alloc(thread, result);
3518 }
3519 }
3520 return res;
3521 } else {
3522 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3523 }
3524 JVM_END
3525
3526
3527 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3528 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3529 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3530 oop constructor_mirror = JNIHandles::resolve(c);
3531 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3532 jobject res = JNIHandles::make_local(THREAD, result);
3533 if (JvmtiExport::should_post_vm_object_alloc()) {
3534 JvmtiExport::post_vm_object_alloc(thread, result);
3535 }
3536 return res;
3537 JVM_END
3538
3539 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3540 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3541 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3542 JVM_END
3543
3544 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3545 jclass caller,
3546 jstring interfaceMethodName,
3547 jobject factoryType,
3548 jobject interfaceMethodType,
3549 jobject implementationMember,
3550 jobject dynamicMethodType,
3551 jclass lambdaProxyClass))
3552 #if INCLUDE_CDS
3553 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3554 return;
3555 }
3556
3557 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3558 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3559 if (caller_ik->is_hidden()) {
3560 // Hidden classes not of type lambda proxy classes are currently not being archived.
3561 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3562 // registered for archiving.
3563 return;
3564 }
3565 Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3566 InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3567 assert(lambda_ik->is_hidden(), "must be a hidden class");
3568 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3569
3570 Symbol* interface_method_name = nullptr;
3571 if (interfaceMethodName != nullptr) {
3572 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3573 }
3574 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3575 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3576
3577 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3578 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3579
3580 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3581 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3582 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3583
3584 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3585 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3586
3587 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3588 interface_method_type, m, dynamic_method_type, THREAD);
3589 #endif // INCLUDE_CDS
3590 JVM_END
3591
3592 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3593 jclass caller,
3594 jstring interfaceMethodName,
3595 jobject factoryType,
3596 jobject interfaceMethodType,
3597 jobject implementationMember,
3598 jobject dynamicMethodType))
3599 #if INCLUDE_CDS
3600
3601 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3602 implementationMember == nullptr || dynamicMethodType == nullptr) {
3603 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3604 }
3605
3606 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3607 InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3608 if (!caller_ik->in_aot_cache()) {
3609 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3610 return nullptr;
3611 }
3612
3613 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3614 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3615 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3616
3617 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3618 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3619
3620 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3621 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3622 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3623
3624 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3625 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3626
3627 InstanceKlass* loaded_lambda =
3628 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3629 interface_method_type, m, dynamic_method_type,
3630 CHECK_(nullptr));
3631 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3632 #else
3633 return nullptr;
3634 #endif // INCLUDE_CDS
3635 JVM_END
3636
3637 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3638 if (CDSConfig::is_dumping_static_archive()) {
3639 // We do this so that the default CDS archive can be deterministic.
3640 const char* release = VM_Version::vm_release();
3641 const char* dbg_level = VM_Version::jdk_debug_level();
3642 const char* version = VM_Version::internal_vm_info_string();
3643 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3644 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3645 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3646 seed += (jlong)VM_Version::vm_major_version();
3647 seed += (jlong)VM_Version::vm_minor_version();
3648 seed += (jlong)VM_Version::vm_security_version();
3649 seed += (jlong)VM_Version::vm_patch_version();
3650 if (seed == 0) { // don't let this ever be zero.
3651 seed = 0x87654321;
3652 }
3653 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3654 return seed;
3655 } else {
3656 return 0;
3657 }
3658 JVM_END
3659
3660 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3661 return CDSConfig::get_status();
3662 JVM_END
3663
3664 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3665 #if INCLUDE_CDS
3666 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3667 if (line != nullptr) {
3668 ResourceMark rm(THREAD);
3669 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3670 char* c_line = java_lang_String::as_utf8_string(h_line());
3671 if (CDSConfig::is_dumping_dynamic_archive()) {
3672 // Note: LambdaFormInvokers::append take same format which is not
3673 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3674 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3675 }
3676 if (ClassListWriter::is_enabled()) {
3677 ClassListWriter w;
3678 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3679 }
3680 }
3681 #endif // INCLUDE_CDS
3682 JVM_END
3683
3684 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3685 #if INCLUDE_CDS
3686 ResourceMark rm(THREAD);
3687 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3688 char* file_name = java_lang_String::as_utf8_string(file_handle());
3689 MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3690 #endif // INCLUDE_CDS
3691 JVM_END
3692
3693 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3694 #if INCLUDE_CDS
3695 ResourceMark rm(THREAD);
3696 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3697 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3698 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3699 #endif // INCLUDE_CDS
3700 JVM_END
3701
3702 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3703 #if INCLUDE_CDS
3704 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3705 if (!k->is_instance_klass()) {
3706 return false;
3707 } else {
3708 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3709 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3710 // This class will be cached in AOT-initialized state. No need for init barriers.
3711 return false;
3712 } else {
3713 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3714 // must emit barriers to ensure class initialization during production run.
3715 ResourceMark rm(THREAD);
3716 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3717 return true;
3718 }
3719 }
3720 #else
3721 return false;
3722 #endif // INCLUDE_CDS
3723 JVM_END
3724
3725 // Returns an array of all live Thread objects (VM internal JavaThreads,
3726 // jvmti agent threads, and JNI attaching threads are skipped)
3727 // See CR 6404306 regarding JNI attaching threads
3728 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3729 ResourceMark rm(THREAD);
3730 ThreadsListEnumerator tle(THREAD, false, false);
3731 JvmtiVMObjectAllocEventCollector oam;
3732
3733 int num_threads = tle.num_threads();
3734 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3735 objArrayHandle threads_ah(THREAD, r);
3736
3737 for (int i = 0; i < num_threads; i++) {
3738 Handle h = tle.get_threadObj(i);
3739 threads_ah->obj_at_put(i, h());
3740 }
3741
3742 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3743 JVM_END
3744
3745
3746 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3747 // Return StackTraceElement[][], each element is the stack trace of a thread in
3748 // the corresponding entry in the given threads array
3749 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3750 JvmtiVMObjectAllocEventCollector oam;
3751
3752 // Check if threads is null
3753 if (threads == nullptr) {
3754 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3755 }
3756
3757 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3758 objArrayHandle ah(THREAD, a);
3759 int num_threads = ah->length();
3760 // check if threads is non-empty array
3761 if (num_threads == 0) {
3762 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3763 }
3764
3765 // check if threads is not an array of objects of Thread class
3766 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3767 if (k != vmClasses::Thread_klass()) {
3768 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3769 }
3770 refArrayHandle rah(THREAD, (refArrayOop)ah()); // j.l.Thread is an identity class, arrays are always reference arrays
3771
3772 ResourceMark rm(THREAD);
3773
3774 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3775 for (int i = 0; i < num_threads; i++) {
3776 oop thread_obj = rah->obj_at(i);
3777 instanceHandle h(THREAD, (instanceOop) thread_obj);
3778 thread_handle_array->append(h);
3779 }
3780
3781 // The JavaThread references in thread_handle_array are validated
3782 // in VM_ThreadDump::doit().
3783 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3784 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3785
3786 JVM_END
3787
3788 // JVM monitoring and management support
3789 JVM_LEAF(void*, JVM_GetManagement(jint version))
3790 return Management::get_jmm_interface(version);
3791 JVM_END
3792
3793 // com.sun.tools.attach.VirtualMachine agent properties support
3794 //
3795 // Initialize the agent properties with the properties maintained in the VM
3796 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3797 ResourceMark rm;
3798
3799 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3800
3801 PUTPROP(props, "sun.java.command", Arguments::java_command());
3802 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3803 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3804 return properties;
3805 JVM_END
3806
3807 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3808 {
3809 JvmtiVMObjectAllocEventCollector oam;
3810
3811 if (ofClass == nullptr) {
3812 return nullptr;
3813 }
3814 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3815 // Special handling for primitive objects
3816 if (java_lang_Class::is_primitive(mirror())) {
3817 return nullptr;
3818 }
3819 Klass* k = java_lang_Class::as_Klass(mirror());
3820 if (!k->is_instance_klass()) {
3821 return nullptr;
3822 }
3823 InstanceKlass* ik = InstanceKlass::cast(k);
3824 int encl_method_class_idx = ik->enclosing_method_class_index();
3825 if (encl_method_class_idx == 0) {
3826 return nullptr;
3827 }
3828 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3829 objArrayHandle dest(THREAD, dest_o);
3830 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3831 dest->obj_at_put(0, enc_k->java_mirror());
3832 int encl_method_method_idx = ik->enclosing_method_method_index();
3833 if (encl_method_method_idx != 0) {
3834 Symbol* sym = ik->constants()->symbol_at(
3835 extract_low_short_from_int(
3836 ik->constants()->name_and_type_at(encl_method_method_idx)));
3837 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3838 dest->obj_at_put(1, str());
3839 sym = ik->constants()->symbol_at(
3840 extract_high_short_from_int(
3841 ik->constants()->name_and_type_at(encl_method_method_idx)));
3842 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3843 dest->obj_at_put(2, str());
3844 }
3845 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3846 }
3847 JVM_END
3848
3849 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3850 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3851 ResourceMark rm(THREAD);
3852
3853 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3854 return nullptr;
3855 }
3856
3857 char** vm_flags = Arguments::jvm_flags_array();
3858 char** vm_args = Arguments::jvm_args_array();
3859 int num_flags = Arguments::num_jvm_flags();
3860 int num_args = Arguments::num_jvm_args();
3861
3862 InstanceKlass* ik = vmClasses::String_klass();
3863 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3864 objArrayHandle result_h(THREAD, r);
3865
3866 int index = 0;
3867 for (int j = 0; j < num_flags; j++, index++) {
3868 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3869 result_h->obj_at_put(index, h());
3870 }
3871 for (int i = 0; i < num_args; i++, index++) {
3872 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3873 result_h->obj_at_put(index, h());
3874 }
3875 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3876 JVM_END
3877
3878 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3879 return os::get_signal_number(name);
3880 JVM_END
3881
3882 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3883 #if INCLUDE_JVMTI
3884 if (!DoJVMTIVirtualThreadTransitions) {
3885 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3886 return;
3887 }
3888 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3889 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3890 } else {
3891 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3892 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3893 }
3894 #endif
3895 JVM_END
3896
3897 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3898 #if INCLUDE_JVMTI
3899 if (!DoJVMTIVirtualThreadTransitions) {
3900 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3901 return;
3902 }
3903 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3904 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3905 } else {
3906 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3907 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3908 }
3909 #endif
3910 JVM_END
3911
3912 // If notifications are disabled then just update the VTMS transition bit and return.
3913 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3914 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3915 #if INCLUDE_JVMTI
3916 if (!DoJVMTIVirtualThreadTransitions) {
3917 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3918 return;
3919 }
3920 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3921 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3922 } else {
3923 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3924 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3925 }
3926 #endif
3927 JVM_END
3928
3929 // If notifications are disabled then just update the VTMS transition bit and return.
3930 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3931 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3932 #if INCLUDE_JVMTI
3933 if (!DoJVMTIVirtualThreadTransitions) {
3934 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3935 return;
3936 }
3937 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3938 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3939 } else {
3940 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3941 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3942 }
3943 #endif
3944 JVM_END
3945
3946 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3947 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3948 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3949 #if INCLUDE_JVMTI
3950 if (!DoJVMTIVirtualThreadTransitions) {
3951 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3952 return;
3953 }
3954 assert(thread->is_disable_suspend() != (bool)enter,
3955 "nested or unbalanced monitor enter/exit is not allowed");
3956 thread->toggle_is_disable_suspend();
3957 #endif
3958 JVM_END
3959
3960 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3961 #if INCLUDE_JFR
3962 freeze_result result = THREAD->last_freeze_fail_result();
3963 assert(result != freeze_ok, "sanity check");
3964 EventVirtualThreadPinned event(UNTIMED);
3965 event.set_starttime(THREAD->last_freeze_fail_time());
3966 if (event.should_commit()) {
3967 ResourceMark rm(THREAD);
3968 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3969 THREAD->post_vthread_pinned_event(&event, str, result);
3970 }
3971 #endif
3972 JVM_END
3973
3974 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3975 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3976 assert(parkEvent != nullptr, "not initialized");
3977
3978 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3979 oop vthread_head = nullptr;
3980 while (true) {
3981 if (list_head.peek() != nullptr) {
3982 for (;;) {
3983 oop head = list_head.resolve();
3984 if (list_head.cmpxchg(head, nullptr) == head) {
3985 return JNIHandles::make_local(THREAD, head);
3986 }
3987 }
3988 }
3989 ThreadBlockInVM tbivm(THREAD);
3990 parkEvent->park();
3991 }
3992 JVM_END
3993 /*
3994 * Return the current class's class file version. The low order 16 bits of the
3995 * returned jint contain the class's major version. The high order 16 bits
3996 * contain the class's minor version.
3997 */
3998 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3999 oop mirror = JNIHandles::resolve_non_null(current);
4000 if (java_lang_Class::is_primitive(mirror)) {
4001 // return latest major version and minor version of 0.
4002 return JVM_CLASSFILE_MAJOR_VERSION;
4003 }
4004 assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4005
4006 Klass* c = java_lang_Class::as_Klass(mirror);
4007 assert(c->is_instance_klass(), "must be");
4008 InstanceKlass* ik = InstanceKlass::cast(c);
4009 return (ik->minor_version() << 16) | ik->major_version();
4010 JVM_END
4011
4012 /*
4013 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4014 * get the value will see a materialized value and not a scalar-replaced
4015 * null value.
4016 */
4017 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4018 JVM_EnsureMaterializedForStackWalk(env, value);
4019 JVM_END
4020
4021 /*
4022 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4023 */
4024 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4025 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4026 JVM_END