1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassInitializer.hpp"
26 #include "cds/aotMetaspace.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/classListParser.hpp"
29 #include "cds/classListWriter.hpp"
30 #include "cds/dynamicArchive.hpp"
31 #include "cds/heapShared.hpp"
32 #include "cds/lambdaFormInvokers.hpp"
33 #include "cds/lambdaProxyClassDictionary.hpp"
34 #include "classfile/classFileStream.hpp"
35 #include "classfile/classLoader.inline.hpp"
36 #include "classfile/classLoaderData.inline.hpp"
37 #include "classfile/classLoadInfo.hpp"
38 #include "classfile/javaAssertions.hpp"
39 #include "classfile/javaClasses.inline.hpp"
40 #include "classfile/moduleEntry.hpp"
41 #include "classfile/modules.hpp"
42 #include "classfile/packageEntry.hpp"
43 #include "classfile/stringTable.hpp"
44 #include "classfile/symbolTable.hpp"
45 #include "classfile/systemDictionary.hpp"
46 #include "classfile/vmClasses.hpp"
47 #include "classfile/vmSymbols.hpp"
48 #include "gc/shared/collectedHeap.inline.hpp"
49 #include "interpreter/bytecode.hpp"
50 #include "interpreter/bytecodeUtils.hpp"
51 #include "jfr/jfrEvents.hpp"
52 #include "jvm.h"
53 #include "logging/log.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/referenceType.hpp"
56 #include "memory/resourceArea.hpp"
57 #include "memory/universe.hpp"
58 #include "oops/access.inline.hpp"
59 #include "oops/constantPool.hpp"
60 #include "oops/fieldStreams.inline.hpp"
61 #include "oops/flatArrayKlass.hpp"
62 #include "oops/instanceKlass.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/method.hpp"
65 #include "oops/objArrayKlass.hpp"
66 #include "oops/objArrayOop.inline.hpp"
67 #include "oops/oop.inline.hpp"
68 #include "oops/recordComponent.hpp"
69 #include "oops/refArrayOop.inline.hpp"
70 #include "prims/foreignGlobals.hpp"
71 #include "prims/jvm_misc.hpp"
72 #include "prims/jvmtiExport.hpp"
73 #include "prims/jvmtiThreadState.inline.hpp"
74 #include "prims/stackwalk.hpp"
75 #include "runtime/arguments.hpp"
76 #include "runtime/atomicAccess.hpp"
77 #include "runtime/continuation.hpp"
78 #include "runtime/deoptimization.hpp"
79 #include "runtime/globals_extension.hpp"
80 #include "runtime/handles.inline.hpp"
81 #include "runtime/handshake.hpp"
82 #include "runtime/init.hpp"
83 #include "runtime/interfaceSupport.inline.hpp"
84 #include "runtime/java.hpp"
85 #include "runtime/javaCalls.hpp"
86 #include "runtime/javaThread.hpp"
87 #include "runtime/jfieldIDWorkaround.hpp"
88 #include "runtime/jniHandles.inline.hpp"
89 #include "runtime/os.inline.hpp"
90 #include "runtime/osThread.hpp"
91 #include "runtime/perfData.hpp"
92 #include "runtime/reflection.hpp"
93 #include "runtime/synchronizer.hpp"
94 #include "runtime/threadIdentifier.hpp"
95 #include "runtime/threadSMR.hpp"
96 #include "runtime/vframe.inline.hpp"
97 #include "runtime/vm_version.hpp"
98 #include "runtime/vmOperations.hpp"
99 #include "services/attachListener.hpp"
100 #include "services/management.hpp"
101 #include "services/threadService.hpp"
102 #include "utilities/checkedCast.hpp"
103 #include "utilities/copy.hpp"
104 #include "utilities/defaultStream.hpp"
105 #include "utilities/dtrace.hpp"
106 #include "utilities/events.hpp"
107 #include "utilities/macros.hpp"
108 #include "utilities/utf8.hpp"
109 #include "utilities/zipLibrary.hpp"
110 #if INCLUDE_CDS
111 #include "classfile/systemDictionaryShared.hpp"
112 #endif
113 #if INCLUDE_JFR
114 #include "jfr/jfr.hpp"
115 #endif
116 #if INCLUDE_MANAGEMENT
117 #include "services/finalizerService.hpp"
118 #endif
119 #ifdef LINUX
120 #include "osContainer_linux.hpp"
121 #endif
122
123 #include <errno.h>
124
125 /*
126 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
127 such ctors and calls MUST NOT come between an oop declaration/init and its
128 usage because if objects are move this may cause various memory stomps, bus
129 errors and segfaults. Here is a cookbook for causing so called "naked oop
130 failures":
131
132 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
133 // Object address to be held directly in mirror & not visible to GC
134 oop mirror = JNIHandles::resolve_non_null(ofClass);
135
136 // If this ctor can hit a safepoint, moving objects around, then
137 ComplexConstructor foo;
138
139 // Boom! mirror may point to JUNK instead of the intended object
140 (some dereference of mirror)
141
142 // Here's another call that may block for GC, making mirror stale
143 MutexLocker ml(some_lock);
144
145 // And here's an initializer that can result in a stale oop
146 // all in one step.
147 oop o = call_that_can_throw_exception(TRAPS);
148
149
150 The solution is to keep the oop declaration BELOW the ctor or function
151 call that might cause a GC, do another resolve to reassign the oop, or
152 consider use of a Handle instead of an oop so there is immunity from object
153 motion. But note that the "QUICK" entries below do not have a handlemark
154 and thus can only support use of handles passed in.
155 */
156
157 extern void trace_class_resolution(Klass* to_class) {
158 ResourceMark rm;
159 int line_number = -1;
160 const char * source_file = nullptr;
161 const char * trace = "explicit";
162 InstanceKlass* caller = nullptr;
163 JavaThread* jthread = JavaThread::current();
164 if (jthread->has_last_Java_frame()) {
165 vframeStream vfst(jthread);
166
167 // Scan up the stack skipping ClassLoader frames.
168 Method* last_caller = nullptr;
169
170 while (!vfst.at_end()) {
171 Method* m = vfst.method();
172 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
173 break;
174 }
175 last_caller = m;
176 vfst.next();
177 }
178 // if this is called from Class.forName0 and that is called from Class.forName,
179 // then print the caller of Class.forName. If this is Class.loadClass, then print
180 // that caller, otherwise keep quiet since this should be picked up elsewhere.
181 bool found_it = false;
182 if (!vfst.at_end() &&
183 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
184 vfst.method()->name() == vmSymbols::forName0_name()) {
185 vfst.next();
186 if (!vfst.at_end() &&
187 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
188 vfst.method()->name() == vmSymbols::forName_name()) {
189 vfst.next();
190 found_it = true;
191 }
192 } else if (last_caller != nullptr &&
193 last_caller->method_holder()->name() ==
194 vmSymbols::java_lang_ClassLoader() &&
195 last_caller->name() == vmSymbols::loadClass_name()) {
196 found_it = true;
197 } else if (!vfst.at_end()) {
198 if (vfst.method()->is_native()) {
199 // JNI call
200 found_it = true;
201 }
202 }
203 if (found_it && !vfst.at_end()) {
204 // found the caller
205 caller = vfst.method()->method_holder();
206 line_number = vfst.method()->line_number_from_bci(vfst.bci());
207 if (line_number == -1) {
208 // show method name if it's a native method
209 trace = vfst.method()->name_and_sig_as_C_string();
210 }
211 Symbol* s = caller->source_file_name();
212 if (s != nullptr) {
213 source_file = s->as_C_string();
214 }
215 }
216 }
217 if (caller != nullptr) {
218 if (to_class != caller) {
219 const char * from = caller->external_name();
220 const char * to = to_class->external_name();
221 // print in a single call to reduce interleaving between threads
222 if (source_file != nullptr) {
223 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
224 } else {
225 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
226 }
227 }
228 }
229 }
230
231 // java.lang.System //////////////////////////////////////////////////////////////////////
232
233
234 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
235 return os::javaTimeMillis();
236 JVM_END
237
238 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
239 return os::javaTimeNanos();
240 JVM_END
241
242 // The function below is actually exposed by jdk.internal.misc.VM and not
243 // java.lang.System, but we choose to keep it here so that it stays next
244 // to JVM_CurrentTimeMillis and JVM_NanoTime
245
246 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
247 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
248
249 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
250 jlong seconds;
251 jlong nanos;
252
253 os::javaTimeSystemUTC(seconds, nanos);
254
255 // We're going to verify that the result can fit in a long.
256 // For that we need the difference in seconds between 'seconds'
257 // and 'offset_secs' to be such that:
258 // |seconds - offset_secs| < (2^63/10^9)
259 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
260 // which makes |seconds - offset_secs| < 2^33
261 // and we will prefer +/- 2^32 as the maximum acceptable diff
262 // as 2^32 has a more natural feel than 2^33...
263 //
264 // So if |seconds - offset_secs| >= 2^32 - we return a special
265 // sentinel value (-1) which the caller should take as an
266 // exception value indicating that the offset given to us is
267 // too far from range of the current time - leading to too big
268 // a nano adjustment. The caller is expected to recover by
269 // computing a more accurate offset and calling this method
270 // again. (For the record 2^32 secs is ~136 years, so that
271 // should rarely happen)
272 //
273 jlong diff = seconds - offset_secs;
274 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
275 return -1; // sentinel value: the offset is too far off the target
276 }
277
278 // return the adjustment. If you compute a time by adding
279 // this number of nanoseconds along with the number of seconds
280 // in the offset you should get the current UTC time.
281 return (diff * (jlong)1000000000) + nanos;
282 JVM_END
283
284 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
285 jobject dst, jint dst_pos, jint length))
286 // Check if we have null pointers
287 if (src == nullptr || dst == nullptr) {
288 THROW(vmSymbols::java_lang_NullPointerException());
289 }
290 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
291 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
292 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
293 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
294 // Do copy
295 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
296 JVM_END
297
298
299 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
300 JavaValue r(T_OBJECT);
301 // public synchronized Object put(Object key, Object value);
302 HandleMark hm(THREAD);
303 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
304 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
305 JavaCalls::call_virtual(&r,
306 props,
307 vmClasses::Properties_klass(),
308 vmSymbols::put_name(),
309 vmSymbols::object_object_object_signature(),
310 key_str,
311 value_str,
312 THREAD);
313 }
314
315
316 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
317
318 /*
319 * Return all of the system properties in a Java String array with alternating
320 * names and values from the jvm SystemProperty.
321 * Which includes some internal and all commandline -D defined properties.
322 */
323 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
324 ResourceMark rm(THREAD);
325 HandleMark hm(THREAD);
326 int ndx = 0;
327 int fixedCount = 2;
328
329 SystemProperty* p = Arguments::system_properties();
330 int count = Arguments::PropertyList_count(p);
331
332 // Allocate result String array
333 InstanceKlass* ik = vmClasses::String_klass();
334 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
335 objArrayHandle result_h(THREAD, r);
336
337 while (p != nullptr) {
338 const char * key = p->key();
339 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
340 const char * value = p->value();
341 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
342 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
343 result_h->obj_at_put(ndx * 2, key_str());
344 result_h->obj_at_put(ndx * 2 + 1, value_str());
345 ndx++;
346 }
347 p = p->next();
348 }
349
350 // Convert the -XX:MaxDirectMemorySize= command line flag
351 // to the sun.nio.MaxDirectMemorySize property.
352 // Do this after setting user properties to prevent people
353 // from setting the value with a -D option, as requested.
354 // Leave empty if not supplied
355 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
356 char as_chars[256];
357 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
358 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
359 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
360 result_h->obj_at_put(ndx * 2, key_str());
361 result_h->obj_at_put(ndx * 2 + 1, value_str());
362 ndx++;
363 }
364
365 // JVM monitoring and management support
366 // Add the sun.management.compiler property for the compiler's name
367 {
368 #undef CSIZE
369 #if defined(_LP64)
370 #define CSIZE "64-Bit "
371 #else
372 #define CSIZE
373 #endif // 64bit
374
375 #if COMPILER1_AND_COMPILER2
376 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
377 #else
378 #if defined(COMPILER1)
379 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
380 #elif defined(COMPILER2)
381 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
382 #elif INCLUDE_JVMCI
383 #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
384 #else
385 const char* compiler_name = "";
386 #endif // compilers
387 #endif // COMPILER1_AND_COMPILER2
388
389 if (*compiler_name != '\0' &&
390 (Arguments::mode() != Arguments::_int)) {
391 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
392 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
393 result_h->obj_at_put(ndx * 2, key_str());
394 result_h->obj_at_put(ndx * 2 + 1, value_str());
395 ndx++;
396 }
397 }
398
399 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
400 JVM_END
401
402
403 /*
404 * Return the temporary directory that the VM uses for the attach
405 * and perf data files.
406 *
407 * It is important that this directory is well-known and the
408 * same for all VM instances. It cannot be affected by configuration
409 * variables such as java.io.tmpdir.
410 */
411 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
412 HandleMark hm(THREAD);
413 const char* temp_dir = os::get_temp_directory();
414 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
415 return (jstring) JNIHandles::make_local(THREAD, h());
416 JVM_END
417
418 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
419 if (len < 0) {
420 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
421 }
422 elmClass->initialize(CHECK);
423 if (elmClass->is_array_klass() || elmClass->is_identity_class()) {
424 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
425 }
426 if (elmClass->is_abstract()) {
427 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
428 }
429 }
430
431 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
432 oop o = JNIHandles::resolve_non_null(orig);
433 assert(o->is_array(), "Must be");
434 oop array = nullptr;
435 arrayOop org = (arrayOop)o;
436 arrayHandle oh(THREAD, org);
437 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass());
438 InlineKlass* vk = InlineKlass::cast(ak->element_klass());
439 int len = to - from; // length of the new array
440 if (ak->is_null_free_array_klass()) {
441 if ((len != 0) && (from >= org->length() || to > org->length())) {
442 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
443 }
444 }
445 if (org->is_flatArray()) {
446 FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass());
447 LayoutKind lk = fak->layout_kind();
448 ArrayKlass::ArrayProperties props = ArrayKlass::array_properties_from_layout(lk);
449 array = oopFactory::new_flatArray(vk, len, props, lk, CHECK_NULL);
450 arrayHandle ah(THREAD, (arrayOop)array);
451 int end = to < oh()->length() ? to : oh()->length();
452 for (int i = from; i < end; i++) {
453 void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper());
454 void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper());
455 vk->copy_payload_to_addr(src, dst, lk, false);
456 }
457 array = ah();
458 } else {
459 ArrayKlass::ArrayProperties props = org->is_null_free_array() ? ArrayKlass::ArrayProperties::NULL_RESTRICTED : ArrayKlass::ArrayProperties::DEFAULT;
460 array = oopFactory::new_objArray(vk, len, props, CHECK_NULL);
461 int end = to < oh()->length() ? to : oh()->length();
462 for (int i = from; i < end; i++) {
463 if (i < ((objArrayOop)oh())->length()) {
464 ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i));
465 } else {
466 assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
467 ((objArrayOop)array)->obj_at_put(i - from, nullptr);
468 }
469 }
470 }
471 return (jarray) JNIHandles::make_local(THREAD, array);
472 JVM_END
473
474 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
475 oop mirror = JNIHandles::resolve_non_null(elmClass);
476 oop init = JNIHandles::resolve(initVal);
477 if (init == nullptr) {
478 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
479 }
480 Handle init_h(THREAD, init);
481 Klass* klass = java_lang_Class::as_Klass(mirror);
482 if (klass != init_h()->klass()) {
483 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
484 }
485 validate_array_arguments(klass, len, CHECK_NULL);
486 InlineKlass* vk = InlineKlass::cast(klass);
487 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NON_ATOMIC | ArrayKlass::ArrayProperties::NULL_RESTRICTED);
488 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
489 for (int i = 0; i < len; i++) {
490 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
491 }
492 return (jarray) JNIHandles::make_local(THREAD, array);
493 JVM_END
494
495 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
496 oop mirror = JNIHandles::resolve_non_null(elmClass);
497 oop init = JNIHandles::resolve(initVal);
498 if (init == nullptr) {
499 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
500 }
501 Handle init_h(THREAD, init);
502 Klass* klass = java_lang_Class::as_Klass(mirror);
503 if (klass != init_h()->klass()) {
504 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
505 }
506 validate_array_arguments(klass, len, CHECK_NULL);
507 InlineKlass* vk = InlineKlass::cast(klass);
508 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED);
509 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
510 for (int i = 0; i < len; i++) {
511 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
512 }
513 return (jarray) JNIHandles::make_local(THREAD, array);
514 JVM_END
515
516 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
517 oop mirror = JNIHandles::resolve_non_null(elmClass);
518 Klass* klass = java_lang_Class::as_Klass(mirror);
519 klass->initialize(CHECK_NULL);
520 validate_array_arguments(klass, len, CHECK_NULL);
521 InlineKlass* vk = InlineKlass::cast(klass);
522 ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::DEFAULT);
523 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
524 return (jarray) JNIHandles::make_local(THREAD, array);
525 JVM_END
526
527 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
528 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
529 return oop->is_flatArray();
530 JVM_END
531
532 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
533 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
534 return oop->is_null_free_array();
535 JVM_END
536
537 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
538 // There are multiple cases where an array can/must support atomic access:
539 // - the array is a reference array
540 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or ATOMIC_FLAT
541 // - the array is flat and its component type is naturally atomic
542 arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
543 if (oop->is_refArray()) return true;
544 if (oop->is_flatArray()) {
545 FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
546 if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) return true;
547 if (fak->element_klass()->is_naturally_atomic()) return true;
548 }
549 return false;
550 JVM_END
551
552 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
553
554 extern volatile jint vm_created;
555
556 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
557 EventShutdown event;
558 if (event.should_commit()) {
559 event.set_reason("Shutdown requested from Java");
560 event.commit();
561 }
562 JVM_END
563
564
565 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
566 before_exit(thread, true);
567 vm_exit(code);
568 JVM_END
569
570
571 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
572 if (!DisableExplicitGC) {
573 EventSystemGC event;
574 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
575 Universe::heap()->collect(GCCause::_java_lang_system_gc);
576 event.commit();
577 }
578 JVM_END
579
580
581 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
582 return Universe::heap()->millis_since_last_whole_heap_examined();
583 JVM_END
584
585
586 static inline jlong convert_size_t_to_jlong(size_t val) {
587 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
588 NOT_LP64 (return (jlong)val;)
589 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
590 }
591
592 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
593 size_t n = Universe::heap()->capacity();
594 return convert_size_t_to_jlong(n);
595 JVM_END
596
597
598 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
599 size_t n = Universe::heap()->unused();
600 return convert_size_t_to_jlong(n);
601 JVM_END
602
603
604 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
605 size_t n = Universe::heap()->max_capacity();
606 return convert_size_t_to_jlong(n);
607 JVM_END
608
609
610 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
611 return os::active_processor_count();
612 JVM_END
613
614 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
615 #ifdef LINUX
616 if (UseContainerSupport) {
617 return JNI_TRUE;
618 }
619 #endif
620 return JNI_FALSE;
621 JVM_END
622
623 JVM_LEAF(jboolean, JVM_IsContainerized(void))
624 #ifdef LINUX
625 if (OSContainer::is_containerized()) {
626 return JNI_TRUE;
627 }
628 #endif
629 return JNI_FALSE;
630 JVM_END
631
632 // java.lang.Throwable //////////////////////////////////////////////////////
633
634 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
635 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
636 java_lang_Throwable::fill_in_stack_trace(exception);
637 JVM_END
638
639 // java.lang.NullPointerException ///////////////////////////////////////////
640
641 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
642 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
643
644 oop exc = JNIHandles::resolve_non_null(throwable);
645
646 Method* method;
647 int bci;
648 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
649 return nullptr;
650 }
651 if (method->is_native()) {
652 return nullptr;
653 }
654
655 stringStream ss;
656 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
657 if (ok) {
658 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
659 return (jstring) JNIHandles::make_local(THREAD, result);
660 } else {
661 return nullptr;
662 }
663 JVM_END
664
665 // java.lang.StackTraceElement //////////////////////////////////////////////
666
667
668 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
669 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
670 objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
671 objArrayHandle stack_trace(THREAD, st);
672 // Fill in the allocated stack trace
673 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
674 JVM_END
675
676
677 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
678 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
679 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
680 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
681 JVM_END
682
683
684 // java.lang.StackWalker //////////////////////////////////////////////////////
685 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
686 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
687
688 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
689 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
690 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
691 if (!have_name) {
692 oop name = StringTable::intern(method->name(), CHECK);
693 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
694 }
695 if (!have_type) {
696 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
697 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
698 }
699 JVM_END
700
701 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
702 jint skip_frames, jobject contScope, jobject cont,
703 jint buffer_size, jint start_index, jobjectArray frames))
704 if (!thread->has_last_Java_frame()) {
705 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
706 }
707
708 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
709 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
710 Handle cont_h(THREAD, JNIHandles::resolve(cont));
711 // frames array is a ClassFrameInfo[] array when only getting caller reference,
712 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
713 // be null.
714 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
715 objArrayHandle frames_array_h(THREAD, fa);
716
717 if (frames_array_h->length() < buffer_size) {
718 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
719 }
720
721 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
722 buffer_size, start_index, frames_array_h, CHECK_NULL);
723 return JNIHandles::make_local(THREAD, result);
724 JVM_END
725
726
727 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
728 jint last_batch_count, jint buffer_size, jint start_index,
729 jobjectArray frames))
730 // frames array is a ClassFrameInfo[] array when only getting caller reference,
731 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
732 // be null.
733 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
734 objArrayHandle frames_array_h(THREAD, fa);
735
736 if (frames_array_h->length() < buffer_size) {
737 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
738 }
739
740 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
741 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
742 start_index, frames_array_h, THREAD);
743 JVM_END
744
745 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
746 objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
747 objArrayHandle frames_array_h(THREAD, fa);
748 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
749 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
750
751 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
752 JVM_END
753
754 // java.lang.Object ///////////////////////////////////////////////
755
756
757 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
758 // as implemented in the classic virtual machine; return 0 if object is null
759 if (handle == nullptr) {
760 return 0;
761 }
762 oop obj = JNIHandles::resolve_non_null(handle);
763 if (EnableValhalla && obj->klass()->is_inline_klass()) {
764 JavaValue result(T_INT);
765 JavaCallArguments args;
766 Handle ho(THREAD, obj);
767 args.push_oop(ho);
768 methodHandle method(THREAD, Universe::value_object_hash_code_method());
769 JavaCalls::call(&result, method, &args, THREAD);
770 if (HAS_PENDING_EXCEPTION) {
771 if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
772 Handle e(THREAD, PENDING_EXCEPTION);
773 CLEAR_PENDING_EXCEPTION;
774 THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
775 }
776 }
777 return result.get_jint();
778 } else {
779 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
780 }
781 JVM_END
782
783
784 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
785 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
786 ObjectSynchronizer::wait(obj, ms, CHECK);
787 JVM_END
788
789
790 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
791 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
792 ObjectSynchronizer::notify(obj, CHECK);
793 JVM_END
794
795
796 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
797 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
798 ObjectSynchronizer::notifyall(obj, CHECK);
799 JVM_END
800
801
802 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
803 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
804 Klass* klass = obj->klass();
805 JvmtiVMObjectAllocEventCollector oam;
806
807 #ifdef ASSERT
808 // Just checking that the cloneable flag is set correct
809 if (obj->is_array()) {
810 guarantee(klass->is_cloneable(), "all arrays are cloneable");
811 } else {
812 guarantee(obj->is_instance(), "should be instanceOop");
813 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
814 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
815 }
816 #endif
817
818 // Check if class of obj supports the Cloneable interface.
819 // All arrays are considered to be cloneable (See JLS 20.1.5).
820 // All j.l.r.Reference classes are considered non-cloneable.
821 if (!klass->is_cloneable() ||
822 (klass->is_instance_klass() &&
823 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
824 ResourceMark rm(THREAD);
825 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
826 }
827
828 if (klass->is_inline_klass()) {
829 // Value instances have no identity, so return the current instance instead of allocating a new one
830 // Value classes cannot have finalizers, so the method can return immediately
831 return JNIHandles::make_local(THREAD, obj());
832 }
833
834 // Make shallow object copy
835 const size_t size = obj->size();
836 oop new_obj_oop = nullptr;
837 if (obj->is_array()) {
838 const int length = ((arrayOop)obj())->length();
839 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
840 /* do_zero */ true, CHECK_NULL);
841 } else {
842 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
843 }
844
845 HeapAccess<>::clone(obj(), new_obj_oop, size);
846
847 Handle new_obj(THREAD, new_obj_oop);
848 // Caution: this involves a java upcall, so the clone should be
849 // "gc-robust" by this stage.
850 if (klass->has_finalizer()) {
851 assert(obj->is_instance(), "should be instanceOop");
852 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
853 new_obj = Handle(THREAD, new_obj_oop);
854 }
855
856 return JNIHandles::make_local(THREAD, new_obj());
857 JVM_END
858
859 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
860
861 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
862 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
863 JVM_END
864
865 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
866 return InstanceKlass::is_finalization_enabled();
867 JVM_END
868
869 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
870
871 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
872 CONT_RegisterNativeMethods(env, cls);
873 JVM_END
874
875 // java.io.File ///////////////////////////////////////////////////////////////
876
877 JVM_LEAF(char*, JVM_NativePath(char* path))
878 return os::native_path(path);
879 JVM_END
880
881
882 // Misc. class handling ///////////////////////////////////////////////////////////
883
884
885 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
886 // Getting the class of the caller frame.
887 //
888 // The call stack at this point looks something like this:
889 //
890 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
891 // [1] [ @CallerSensitive API.method ]
892 // [.] [ (skipped intermediate frames) ]
893 // [n] [ caller ]
894 vframeStream vfst(thread);
895 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
896 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
897 Method* m = vfst.method();
898 assert(m != nullptr, "sanity");
899 switch (n) {
900 case 0:
901 // This must only be called from Reflection.getCallerClass
902 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
903 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
904 }
905 // fall-through
906 case 1:
907 // Frame 0 and 1 must be caller sensitive.
908 if (!m->caller_sensitive()) {
909 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
910 }
911 break;
912 default:
913 if (!m->is_ignored_by_security_stack_walk()) {
914 // We have reached the desired frame; return the holder class.
915 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
916 }
917 break;
918 }
919 }
920 return nullptr;
921 JVM_END
922
923
924 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
925 oop mirror = nullptr;
926 BasicType t = name2type(utf);
927 if (t != T_ILLEGAL && !is_reference_type(t)) {
928 mirror = Universe::java_mirror(t);
929 }
930 if (mirror == nullptr) {
931 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
932 } else {
933 return (jclass) JNIHandles::make_local(THREAD, mirror);
934 }
935 JVM_END
936
937
938 // Returns a class loaded by the bootstrap class loader; or null
939 // if not found. ClassNotFoundException is not thrown.
940 // FindClassFromBootLoader is exported to the launcher for windows.
941 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
942 const char* name))
943 // Java libraries should ensure that name is never null or illegal.
944 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
945 // It's impossible to create this class; the name cannot fit
946 // into the constant pool.
947 return nullptr;
948 }
949 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
950
951 TempNewSymbol h_name = SymbolTable::new_symbol(name);
952 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
953 if (k == nullptr) {
954 return nullptr;
955 }
956
957 if (log_is_enabled(Debug, class, resolve)) {
958 trace_class_resolution(k);
959 }
960 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
961 JVM_END
962
963 // Find a class with this name in this loader.
964 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
965 jboolean init, jobject loader))
966 TempNewSymbol h_name =
967 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
968 CHECK_NULL);
969
970 oop loader_oop = JNIHandles::resolve(loader);
971 Handle h_loader(THREAD, loader_oop);
972
973 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
974 false, THREAD);
975
976 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
977 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
978 }
979 return result;
980 JVM_END
981
982 // Currently only called from the old verifier.
983 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
984 jboolean init, jclass from))
985 TempNewSymbol h_name =
986 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
987 CHECK_NULL);
988 oop from_class_oop = JNIHandles::resolve(from);
989 assert(from_class_oop != nullptr, "must be");
990 Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
991 assert(from_class != nullptr, "must be");
992 oop class_loader = from_class->class_loader();
993
994 Handle h_loader(THREAD, class_loader);
995 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
996
997 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
998 // this function is generally only used for class loading during verification.
999 ResourceMark rm;
1000 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1001 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1002 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1003 }
1004
1005 #if INCLUDE_CDS
1006 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1007 InstanceKlass* ik = InstanceKlass::cast(from_class);
1008 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1009 }
1010 #endif
1011
1012 return result;
1013 JVM_END
1014
1015 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1016 static jclass jvm_define_class_common(const char *name,
1017 jobject loader, const jbyte *buf,
1018 jsize len, jobject pd, const char *source,
1019 TRAPS) {
1020 if (source == nullptr) source = "__JVM_DefineClass__";
1021
1022 JavaThread* jt = THREAD;
1023
1024 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1025 ClassLoader::perf_define_appclass_selftime(),
1026 ClassLoader::perf_define_appclasses(),
1027 jt->get_thread_stat()->perf_recursion_counts_addr(),
1028 jt->get_thread_stat()->perf_timers_addr(),
1029 PerfClassTraceTime::DEFINE_CLASS);
1030
1031 if (UsePerfData) {
1032 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1033 }
1034
1035 // Class resolution will get the class name from the .class stream if the name is null.
1036 TempNewSymbol class_name = name == nullptr ? nullptr :
1037 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1038 CHECK_NULL);
1039
1040 ResourceMark rm(THREAD);
1041 ClassFileStream st((u1*)buf, len, source);
1042 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1043 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1044 ClassLoadInfo cl_info(protection_domain);
1045 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1046 class_loader,
1047 cl_info,
1048 CHECK_NULL);
1049
1050 if (log_is_enabled(Debug, class, resolve)) {
1051 trace_class_resolution(k);
1052 }
1053
1054 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1055 }
1056
1057 enum {
1058 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1059 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1060 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1061 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1062 };
1063
1064 /*
1065 * Define a class with the specified flags that indicates if it's a nestmate,
1066 * hidden, or strongly referenced from class loader.
1067 */
1068 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1069 const jbyte *buf, jsize len, jobject pd,
1070 jboolean init, int flags, jobject classData, TRAPS) {
1071 ResourceMark rm(THREAD);
1072
1073 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1074 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1075 if (lookup_k == nullptr) {
1076 // The error message is wrong. We come here only if lookup is a primitive class
1077 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1078 }
1079
1080 Handle class_loader (THREAD, lookup_k->class_loader());
1081
1082 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1083 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1084 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1085 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1086
1087 InstanceKlass* host_class = nullptr;
1088 if (is_nestmate) {
1089 host_class = lookup_k->nest_host(CHECK_NULL);
1090 }
1091
1092 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1093 name,
1094 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1095 is_nestmate ? host_class->external_name() : "",
1096 is_hidden ? "hidden" : "not hidden",
1097 is_strong ? "strong" : "weak",
1098 vm_annotations ? "with vm annotations" : "without vm annotation");
1099
1100 if (!is_hidden) {
1101 // classData is only applicable for hidden classes
1102 if (classData != nullptr) {
1103 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1104 }
1105 if (is_nestmate) {
1106 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1107 }
1108 if (!is_strong) {
1109 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1110 }
1111 if (vm_annotations) {
1112 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1113 }
1114 if (flags != STRONG_LOADER_LINK) {
1115 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1116 err_msg("invalid flag 0x%x", flags));
1117 }
1118 }
1119
1120 // Class resolution will get the class name from the .class stream if the name is null.
1121 TempNewSymbol class_name = name == nullptr ? nullptr :
1122 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1123 CHECK_NULL);
1124
1125 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1126 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1127 ClassFileStream st((u1*)buf, len, source);
1128
1129 InstanceKlass* ik = nullptr;
1130 if (!is_hidden) {
1131 ClassLoadInfo cl_info(protection_domain);
1132 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1133 class_loader,
1134 cl_info,
1135 CHECK_NULL);
1136
1137 if (log_is_enabled(Debug, class, resolve)) {
1138 trace_class_resolution(ik);
1139 }
1140 } else { // hidden
1141 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1142 ClassLoadInfo cl_info(protection_domain,
1143 host_class,
1144 classData_h,
1145 is_hidden,
1146 is_strong,
1147 vm_annotations);
1148 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1149 class_loader,
1150 cl_info,
1151 CHECK_NULL);
1152
1153 // The hidden class loader data has been artificially been kept alive to
1154 // this point. The mirror and any instances of this class have to keep
1155 // it alive afterwards.
1156 ik->class_loader_data()->dec_keep_alive_ref_count();
1157
1158 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1159 ModuleEntry* module = ik->module();
1160 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1161 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1162 module_name,
1163 ik->external_name(),
1164 host_class->external_name(),
1165 ik->is_hidden() ? "is hidden" : "is not hidden");
1166 }
1167 }
1168
1169 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1170 // non-hidden class or nestmate class must be in the same package as the Lookup class
1171 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1172 }
1173
1174 if (init) {
1175 ik->initialize(CHECK_NULL);
1176 } else {
1177 ik->link_class(CHECK_NULL);
1178 }
1179
1180 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1181 }
1182
1183 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1184 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1185 JVM_END
1186
1187 /*
1188 * Define a class with the specified lookup class.
1189 * lookup: Lookup class
1190 * name: the name of the class
1191 * buf: class bytes
1192 * len: length of class bytes
1193 * pd: protection domain
1194 * init: initialize the class
1195 * flags: properties of the class
1196 * classData: private static pre-initialized field
1197 */
1198 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1199 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1200
1201 if (lookup == nullptr) {
1202 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1203 }
1204
1205 assert(buf != nullptr, "buf must not be null");
1206
1207 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1208 JVM_END
1209
1210 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1211
1212 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1213 JVM_END
1214
1215 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1216 ResourceMark rm(THREAD);
1217
1218 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1219 char* str = java_lang_String::as_utf8_string(h_name());
1220
1221 // Sanity check, don't expect null
1222 if (str == nullptr) return nullptr;
1223
1224 // Internalize the string, converting '.' to '/' in string.
1225 char* p = (char*)str;
1226 while (*p != '\0') {
1227 if (*p == '.') {
1228 *p = '/';
1229 }
1230 p++;
1231 }
1232
1233 const int str_len = (int)(p - str);
1234 if (str_len > Symbol::max_length()) {
1235 // It's impossible to create this class; the name cannot fit
1236 // into the constant pool.
1237 return nullptr;
1238 }
1239 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1240
1241 // Security Note:
1242 // The Java level wrapper will perform the necessary security check allowing
1243 // us to pass the null as the initiating class loader.
1244 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1245 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1246 #if INCLUDE_CDS
1247 if (k == nullptr) {
1248 // If the class is not already loaded, try to see if it's in the shared
1249 // archive for the current classloader (h_loader).
1250 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1251 }
1252 #endif
1253 return (k == nullptr) ? nullptr :
1254 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1255 JVM_END
1256
1257 // Module support //////////////////////////////////////////////////////////////////////////////
1258
1259 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1260 jstring location, jobjectArray packages))
1261 Handle h_module (THREAD, JNIHandles::resolve(module));
1262 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1263 JVM_END
1264
1265 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1266 Handle h_module (THREAD, JNIHandles::resolve(module));
1267 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1268 JVM_END
1269
1270 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1271 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1272 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1273 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1274 JVM_END
1275
1276 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1277 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1278 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1279 JVM_END
1280
1281 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1282 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1283 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1284 JVM_END
1285
1286 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1287 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1288 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1289 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1290 JVM_END
1291
1292 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1293 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1294 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1295 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1296 JVM_END
1297
1298 // Reflection support //////////////////////////////////////////////////////////////////////////////
1299
1300 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1301 assert (cls != nullptr, "illegal class");
1302 JvmtiVMObjectAllocEventCollector oam;
1303 ResourceMark rm(THREAD);
1304 HandleMark hm(THREAD);
1305 Handle java_class(THREAD, JNIHandles::resolve(cls));
1306 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1307 return (jstring) JNIHandles::make_local(THREAD, result);
1308 JVM_END
1309
1310
1311 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1312 JvmtiVMObjectAllocEventCollector oam;
1313 oop mirror = JNIHandles::resolve_non_null(cls);
1314
1315 // Special handling for primitive objects
1316 if (java_lang_Class::is_primitive(mirror)) {
1317 // Primitive objects does not have any interfaces
1318 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1319 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1320 }
1321
1322 Klass* klass = java_lang_Class::as_Klass(mirror);
1323 // Figure size of result array
1324 int size;
1325 if (klass->is_instance_klass()) {
1326 InstanceKlass* ik = InstanceKlass::cast(klass);
1327 size = ik->local_interfaces()->length();
1328 } else {
1329 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1330 size = 2;
1331 }
1332
1333 // Allocate result array
1334 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1335 objArrayHandle result (THREAD, r);
1336 // Fill in result
1337 if (klass->is_instance_klass()) {
1338 // Regular instance klass, fill in all local interfaces
1339 for (int index = 0; index < size; index++) {
1340 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1341 result->obj_at_put(index, k->java_mirror());
1342 }
1343 } else {
1344 // All arrays implement java.lang.Cloneable and java.io.Serializable
1345 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1346 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1347 }
1348 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1349 JVM_END
1350
1351
1352 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1353 oop mirror = JNIHandles::resolve_non_null(cls);
1354 if (java_lang_Class::is_primitive(mirror)) {
1355 return JNI_FALSE;
1356 }
1357 Klass* k = java_lang_Class::as_Klass(mirror);
1358 return k->is_hidden();
1359 JVM_END
1360
1361 class ScopedValueBindingsResolver {
1362 public:
1363 InstanceKlass* Carrier_klass;
1364 ScopedValueBindingsResolver(JavaThread* THREAD) {
1365 Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1366 Carrier_klass = InstanceKlass::cast(k);
1367 }
1368 };
1369
1370 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1371 ResourceMark rm(THREAD);
1372 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1373 JvmtiVMObjectAllocEventCollector oam;
1374
1375 static ScopedValueBindingsResolver resolver(THREAD);
1376
1377 // Iterate through Java frames
1378 vframeStream vfst(thread);
1379 for(; !vfst.at_end(); vfst.next()) {
1380 int loc = -1;
1381 // get method of frame
1382 Method* method = vfst.method();
1383
1384 Symbol *name = method->name();
1385
1386 InstanceKlass* holder = method->method_holder();
1387 if (name == vmSymbols::runWith_method_name()) {
1388 if (holder == vmClasses::Thread_klass()
1389 || holder == resolver.Carrier_klass) {
1390 loc = 1;
1391 }
1392 }
1393
1394 if (loc != -1) {
1395 javaVFrame *frame = vfst.asJavaVFrame();
1396 StackValueCollection* locals = frame->locals();
1397 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1398 Handle result = head_sv->get_obj();
1399 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1400 if (result() != nullptr) {
1401 return JNIHandles::make_local(THREAD, result());
1402 }
1403 }
1404 }
1405
1406 return nullptr;
1407 JVM_END
1408
1409 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1410 JvmtiVMObjectAllocEventCollector oam;
1411 // ofClass is a reference to a java_lang_Class object. The mirror object
1412 // of an InstanceKlass
1413 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1414 if (java_lang_Class::is_primitive(ofMirror) ||
1415 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1416 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1417 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1418 }
1419
1420 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1421 InnerClassesIterator iter(k);
1422
1423 if (iter.length() == 0) {
1424 // Neither an inner nor outer class
1425 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1426 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1427 }
1428
1429 // find inner class info
1430 constantPoolHandle cp(thread, k->constants());
1431 int length = iter.length();
1432
1433 // Allocate temp. result array
1434 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1435 objArrayHandle result (THREAD, r);
1436 int members = 0;
1437
1438 for (; !iter.done(); iter.next()) {
1439 int ioff = iter.inner_class_info_index();
1440 int ooff = iter.outer_class_info_index();
1441
1442 if (ioff != 0 && ooff != 0) {
1443 // Check to see if the name matches the class we're looking for
1444 // before attempting to find the class.
1445 if (cp->klass_name_at_matches(k, ooff)) {
1446 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1447 if (outer_klass == k) {
1448 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1449 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1450
1451 // Throws an exception if outer klass has not declared k as
1452 // an inner klass
1453 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1454
1455 result->obj_at_put(members, inner_klass->java_mirror());
1456 members++;
1457 }
1458 }
1459 }
1460 }
1461
1462 if (members != length) {
1463 // Return array of right length
1464 objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1465 for(int i = 0; i < members; i++) {
1466 res->obj_at_put(i, result->obj_at(i));
1467 }
1468 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1469 }
1470
1471 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1472 JVM_END
1473
1474
1475 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1476 {
1477 // ofClass is a reference to a java_lang_Class object.
1478 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1479 if (java_lang_Class::is_primitive(ofMirror)) {
1480 return nullptr;
1481 }
1482 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1483 if (!klass->is_instance_klass()) {
1484 return nullptr;
1485 }
1486
1487 bool inner_is_member = false;
1488 Klass* outer_klass
1489 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1490 if (outer_klass == nullptr) return nullptr; // already a top-level class
1491 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1492 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1493 }
1494 JVM_END
1495
1496 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1497 {
1498 oop mirror = JNIHandles::resolve_non_null(cls);
1499 if (java_lang_Class::is_primitive(mirror)) {
1500 return nullptr;
1501 }
1502 Klass* klass = java_lang_Class::as_Klass(mirror);
1503 if (!klass->is_instance_klass()) {
1504 return nullptr;
1505 }
1506 InstanceKlass* k = InstanceKlass::cast(klass);
1507 int ooff = 0, noff = 0;
1508 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1509 if (noff != 0) {
1510 constantPoolHandle i_cp(thread, k->constants());
1511 Symbol* name = i_cp->symbol_at(noff);
1512 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1513 return (jstring) JNIHandles::make_local(THREAD, str());
1514 }
1515 }
1516 return nullptr;
1517 }
1518 JVM_END
1519
1520 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1521 assert (cls != nullptr, "illegal class");
1522 JvmtiVMObjectAllocEventCollector oam;
1523 ResourceMark rm(THREAD);
1524 oop mirror = JNIHandles::resolve_non_null(cls);
1525 // Return null for arrays and primitives
1526 if (!java_lang_Class::is_primitive(mirror)) {
1527 Klass* k = java_lang_Class::as_Klass(mirror);
1528 if (k->is_instance_klass()) {
1529 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1530 if (sym == nullptr) return nullptr;
1531 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1532 return (jstring) JNIHandles::make_local(THREAD, str());
1533 }
1534 }
1535 return nullptr;
1536 JVM_END
1537
1538
1539 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1540 assert (cls != nullptr, "illegal class");
1541 oop mirror = JNIHandles::resolve_non_null(cls);
1542 // Return null for arrays and primitives
1543 if (!java_lang_Class::is_primitive(mirror)) {
1544 Klass* k = java_lang_Class::as_Klass(mirror);
1545 if (k->is_instance_klass()) {
1546 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1547 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1548 }
1549 }
1550 return nullptr;
1551 JVM_END
1552
1553
1554 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1555 // some of this code was adapted from from jni_FromReflectedField
1556
1557 oop reflected = JNIHandles::resolve_non_null(field);
1558 oop mirror = java_lang_reflect_Field::clazz(reflected);
1559 int slot = java_lang_reflect_Field::slot(reflected);
1560 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1561
1562 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1563 int offset = ik->field_offset(slot);
1564
1565 if (modifiers & JVM_ACC_STATIC) {
1566 // for static fields we only look in the current class
1567 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1568 assert(false, "cannot find static field");
1569 return false;
1570 }
1571 } else {
1572 // for instance fields we start with the current class and work
1573 // our way up through the superclass chain
1574 if (!ik->find_field_from_offset(offset, false, &fd)) {
1575 assert(false, "cannot find instance field");
1576 return false;
1577 }
1578 }
1579 return true;
1580 }
1581
1582 static Method* jvm_get_method_common(jobject method) {
1583 // some of this code was adapted from from jni_FromReflectedMethod
1584
1585 oop reflected = JNIHandles::resolve_non_null(method);
1586 oop mirror = nullptr;
1587 int slot = 0;
1588
1589 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1590 mirror = java_lang_reflect_Constructor::clazz(reflected);
1591 slot = java_lang_reflect_Constructor::slot(reflected);
1592 } else {
1593 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1594 "wrong type");
1595 mirror = java_lang_reflect_Method::clazz(reflected);
1596 slot = java_lang_reflect_Method::slot(reflected);
1597 }
1598 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1599
1600 Method* m = ik->method_with_idnum(slot);
1601 assert(m != nullptr, "cannot find method");
1602 return m; // caller has to deal with null in product mode
1603 }
1604
1605 /* Type use annotations support (JDK 1.8) */
1606
1607 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1608 assert (cls != nullptr, "illegal class");
1609 ResourceMark rm(THREAD);
1610 // Return null for arrays and primitives
1611 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1612 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1613 if (k->is_instance_klass()) {
1614 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1615 if (type_annotations != nullptr) {
1616 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1617 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1618 }
1619 }
1620 }
1621 return nullptr;
1622 JVM_END
1623
1624 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1625 assert (method != nullptr, "illegal method");
1626 // method is a handle to a java.lang.reflect.Method object
1627 Method* m = jvm_get_method_common(method);
1628 if (m == nullptr) {
1629 return nullptr;
1630 }
1631
1632 AnnotationArray* type_annotations = m->type_annotations();
1633 if (type_annotations != nullptr) {
1634 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1635 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1636 }
1637
1638 return nullptr;
1639 JVM_END
1640
1641 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1642 assert (field != nullptr, "illegal field");
1643 fieldDescriptor fd;
1644 bool gotFd = jvm_get_field_common(field, fd);
1645 if (!gotFd) {
1646 return nullptr;
1647 }
1648
1649 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1650 JVM_END
1651
1652 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1653 if (!cp->is_within_bounds(index)) {
1654 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1655 }
1656 }
1657
1658 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1659 {
1660 // method is a handle to a java.lang.reflect.Method object
1661 Method* method_ptr = jvm_get_method_common(method);
1662 methodHandle mh (THREAD, method_ptr);
1663 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1664 const int num_params = mh->method_parameters_length();
1665
1666 if (num_params < 0) {
1667 // A -1 return value from method_parameters_length means there is no
1668 // parameter data. Return null to indicate this to the reflection
1669 // API.
1670 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1671 return (jobjectArray)nullptr;
1672 } else {
1673 // Otherwise, we return something up to reflection, even if it is
1674 // a zero-length array. Why? Because in some cases this can
1675 // trigger a MalformedParametersException.
1676
1677 // make sure all the symbols are properly formatted
1678 for (int i = 0; i < num_params; i++) {
1679 MethodParametersElement* params = mh->method_parameters_start();
1680 int index = params[i].name_cp_index;
1681 constantPoolHandle cp(THREAD, mh->constants());
1682 bounds_check(cp, index, CHECK_NULL);
1683
1684 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1685 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1686 "Wrong type at constant pool index");
1687 }
1688
1689 }
1690
1691 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1692 objArrayHandle result (THREAD, result_oop);
1693
1694 for (int i = 0; i < num_params; i++) {
1695 MethodParametersElement* params = mh->method_parameters_start();
1696 // For a 0 index, give a null symbol
1697 Symbol* sym = 0 != params[i].name_cp_index ?
1698 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1699 int flags = params[i].flags;
1700 oop param = Reflection::new_parameter(reflected_method, i, sym,
1701 flags, CHECK_NULL);
1702 result->obj_at_put(i, param);
1703 }
1704 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1705 }
1706 }
1707 JVM_END
1708
1709 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1710
1711 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1712 {
1713 JvmtiVMObjectAllocEventCollector oam;
1714
1715 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1716 // Exclude primitive types and array types
1717 if (java_lang_Class::is_primitive(ofMirror) ||
1718 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1719 // Return empty array
1720 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1721 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1722 }
1723
1724 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1725 constantPoolHandle cp(THREAD, k->constants());
1726
1727 // Ensure class is linked
1728 k->link_class(CHECK_NULL);
1729
1730 // Allocate result
1731 int num_fields;
1732
1733 if (publicOnly) {
1734 num_fields = 0;
1735 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1736 if (fs.access_flags().is_public()) ++num_fields;
1737 }
1738 } else {
1739 num_fields = k->java_fields_count();
1740 }
1741
1742 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1743 objArrayHandle result (THREAD, r);
1744
1745 int out_idx = 0;
1746 fieldDescriptor fd;
1747 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1748 if (!publicOnly || fs.access_flags().is_public()) {
1749 fd.reinitialize(k, fs.to_FieldInfo());
1750 oop field = Reflection::new_field(&fd, CHECK_NULL);
1751 result->obj_at_put(out_idx, field);
1752 ++out_idx;
1753 }
1754 }
1755 assert(out_idx == num_fields, "just checking");
1756 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1757 }
1758 JVM_END
1759
1760 // A class is a record if and only if it is final and a direct subclass of
1761 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1762 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1763 {
1764 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1765 if (k != nullptr && k->is_instance_klass()) {
1766 InstanceKlass* ik = InstanceKlass::cast(k);
1767 return ik->is_record();
1768 } else {
1769 return false;
1770 }
1771 }
1772 JVM_END
1773
1774 // Returns an array containing the components of the Record attribute,
1775 // or null if the attribute is not present.
1776 //
1777 // Note that this function returns the components of the Record attribute
1778 // even if the class is not a record.
1779 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1780 {
1781 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1782
1783 Array<RecordComponent*>* components = ik->record_components();
1784 if (components != nullptr) {
1785 JvmtiVMObjectAllocEventCollector oam;
1786 constantPoolHandle cp(THREAD, ik->constants());
1787 int length = components->length();
1788 assert(length >= 0, "unexpected record_components length");
1789 objArrayOop record_components =
1790 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1791 objArrayHandle components_h (THREAD, record_components);
1792
1793 for (int x = 0; x < length; x++) {
1794 RecordComponent* component = components->at(x);
1795 assert(component != nullptr, "unexpected null record component");
1796 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1797 components_h->obj_at_put(x, component_oop);
1798 }
1799 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1800 }
1801
1802 return nullptr;
1803 }
1804 JVM_END
1805
1806 static jobjectArray get_class_declared_methods_helper(
1807 JNIEnv *env,
1808 jclass ofClass, jboolean publicOnly,
1809 bool want_constructor,
1810 Klass* klass, TRAPS) {
1811
1812 JvmtiVMObjectAllocEventCollector oam;
1813
1814 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1815 // Exclude primitive types and array types
1816 if (java_lang_Class::is_primitive(ofMirror)
1817 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1818 // Return empty array
1819 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1820 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1821 }
1822
1823 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1824
1825 // Ensure class is linked
1826 k->link_class(CHECK_NULL);
1827
1828 Array<Method*>* methods = k->methods();
1829 int methods_length = methods->length();
1830
1831 // Save original method_idnum in case of redefinition, which can change
1832 // the idnum of obsolete methods. The new method will have the same idnum
1833 // but if we refresh the methods array, the counts will be wrong.
1834 ResourceMark rm(THREAD);
1835 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1836 int num_methods = 0;
1837
1838 // Select methods matching the criteria.
1839 for (int i = 0; i < methods_length; i++) {
1840 Method* method = methods->at(i);
1841 if (want_constructor && !method->is_object_constructor()) {
1842 continue;
1843 }
1844 if (!want_constructor &&
1845 (method->is_object_constructor() || method->is_class_initializer() ||
1846 method->is_overpass())) {
1847 continue;
1848 }
1849 if (publicOnly && !method->is_public()) {
1850 continue;
1851 }
1852 idnums->push(method->method_idnum());
1853 ++num_methods;
1854 }
1855
1856 // Allocate result
1857 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1858 objArrayHandle result (THREAD, r);
1859
1860 // Now just put the methods that we selected above, but go by their idnum
1861 // in case of redefinition. The methods can be redefined at any safepoint,
1862 // so above when allocating the oop array and below when creating reflect
1863 // objects.
1864 for (int i = 0; i < num_methods; i++) {
1865 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1866 if (method.is_null()) {
1867 // Method may have been deleted and seems this API can handle null
1868 // Otherwise should probably put a method that throws NSME
1869 result->obj_at_put(i, nullptr);
1870 } else {
1871 oop m;
1872 if (want_constructor) {
1873 assert(method->is_object_constructor(), "must be");
1874 m = Reflection::new_constructor(method, CHECK_NULL);
1875 } else {
1876 m = Reflection::new_method(method, false, CHECK_NULL);
1877 }
1878 result->obj_at_put(i, m);
1879 }
1880 }
1881
1882 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1883 }
1884
1885 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1886 {
1887 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1888 /*want_constructor*/ false,
1889 vmClasses::reflect_Method_klass(), THREAD);
1890 }
1891 JVM_END
1892
1893 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1894 {
1895 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1896 /*want_constructor*/ true,
1897 vmClasses::reflect_Constructor_klass(), THREAD);
1898 }
1899 JVM_END
1900
1901 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1902 {
1903 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1904 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1905 return c->has_nestmate_access_to(m, THREAD);
1906 }
1907 JVM_END
1908
1909 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1910 {
1911 // current is not a primitive or array class
1912 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1913 InstanceKlass* host = c->nest_host(THREAD);
1914 return (jclass) (host == nullptr ? nullptr :
1915 JNIHandles::make_local(THREAD, host->java_mirror()));
1916 }
1917 JVM_END
1918
1919 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1920 {
1921 // current is not a primitive or array class
1922 ResourceMark rm(THREAD);
1923 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1924 InstanceKlass* host = c->nest_host(THREAD);
1925
1926 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1927 c->external_name(), host->external_name());
1928 {
1929 JvmtiVMObjectAllocEventCollector oam;
1930 Array<u2>* members = host->nest_members();
1931 int length = members == nullptr ? 0 : members->length();
1932
1933 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1934
1935 // nest host is first in the array so make it one bigger
1936 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1937 length + 1, CHECK_NULL);
1938 objArrayHandle result(THREAD, r);
1939 result->obj_at_put(0, host->java_mirror());
1940 if (length != 0) {
1941 int count = 0;
1942 for (int i = 0; i < length; i++) {
1943 int cp_index = members->at(i);
1944 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1945 if (HAS_PENDING_EXCEPTION) {
1946 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1947 return nullptr; // propagate VMEs
1948 }
1949 if (log_is_enabled(Trace, class, nestmates)) {
1950 stringStream ss;
1951 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1952 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1953 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1954 log_trace(class, nestmates)("%s", ss.as_string());
1955 }
1956 CLEAR_PENDING_EXCEPTION;
1957 continue;
1958 }
1959 if (k->is_instance_klass()) {
1960 InstanceKlass* ik = InstanceKlass::cast(k);
1961 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1962 if (nest_host_k == host) {
1963 result->obj_at_put(count+1, k->java_mirror());
1964 count++;
1965 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1966 } else {
1967 log_trace(class, nestmates)(" - skipping member %s with different host %s",
1968 ik->external_name(), nest_host_k->external_name());
1969 }
1970 } else {
1971 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1972 k->external_name());
1973 }
1974 }
1975 if (count < length) {
1976 // we had invalid entries so we need to compact the array
1977 log_trace(class, nestmates)(" - compacting array from length %d to %d",
1978 length + 1, count + 1);
1979
1980 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1981 count + 1, CHECK_NULL);
1982 objArrayHandle result2(THREAD, r2);
1983 for (int i = 0; i < count + 1; i++) {
1984 result2->obj_at_put(i, result->obj_at(i));
1985 }
1986 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1987 }
1988 }
1989 else {
1990 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
1991 }
1992 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1993 }
1994 }
1995 JVM_END
1996
1997 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
1998 {
1999 oop mirror = JNIHandles::resolve_non_null(current);
2000 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2001 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2002
2003 ResourceMark rm(THREAD);
2004 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2005 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2006 if (ik->is_sealed()) {
2007 JvmtiVMObjectAllocEventCollector oam;
2008 Array<u2>* subclasses = ik->permitted_subclasses();
2009 int length = subclasses->length();
2010
2011 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2012
2013 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2014 length, CHECK_NULL);
2015 objArrayHandle result(THREAD, r);
2016 int count = 0;
2017 for (int i = 0; i < length; i++) {
2018 int cp_index = subclasses->at(i);
2019 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2020 if (HAS_PENDING_EXCEPTION) {
2021 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2022 return nullptr; // propagate VMEs
2023 }
2024 if (log_is_enabled(Trace, class, sealed)) {
2025 stringStream ss;
2026 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2027 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2028 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2029 log_trace(class, sealed)("%s", ss.as_string());
2030 }
2031
2032 CLEAR_PENDING_EXCEPTION;
2033 continue;
2034 }
2035 if (k->is_instance_klass()) {
2036 result->obj_at_put(count++, k->java_mirror());
2037 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2038 }
2039 }
2040 if (count < length) {
2041 // we had invalid entries so we need to compact the array
2042 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2043 count, CHECK_NULL);
2044 objArrayHandle result2(THREAD, r2);
2045 for (int i = 0; i < count; i++) {
2046 result2->obj_at_put(i, result->obj_at(i));
2047 }
2048 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2049 }
2050 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2051 } else {
2052 return nullptr;
2053 }
2054 }
2055 JVM_END
2056
2057 // Constant pool access //////////////////////////////////////////////////////////
2058
2059 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2060 {
2061 JvmtiVMObjectAllocEventCollector oam;
2062 oop mirror = JNIHandles::resolve_non_null(cls);
2063 // Return null for primitives and arrays
2064 if (!java_lang_Class::is_primitive(mirror)) {
2065 Klass* k = java_lang_Class::as_Klass(mirror);
2066 if (k->is_instance_klass()) {
2067 InstanceKlass* k_h = InstanceKlass::cast(k);
2068 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2069 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2070 return JNIHandles::make_local(THREAD, jcp());
2071 }
2072 }
2073 return nullptr;
2074 }
2075 JVM_END
2076
2077
2078 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2079 {
2080 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2081 return cp->length();
2082 }
2083 JVM_END
2084
2085
2086 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2087 {
2088 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2089 bounds_check(cp, index, CHECK_NULL);
2090 constantTag tag = cp->tag_at(index);
2091 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2092 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2093 }
2094 Klass* k = cp->klass_at(index, CHECK_NULL);
2095 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2096 }
2097 JVM_END
2098
2099 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2100 {
2101 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2102 bounds_check(cp, index, CHECK_NULL);
2103 constantTag tag = cp->tag_at(index);
2104 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2105 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2106 }
2107 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2108 if (k == nullptr) return nullptr;
2109 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2110 }
2111 JVM_END
2112
2113 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2114 constantTag tag = cp->tag_at(index);
2115 if (!tag.is_method() && !tag.is_interface_method()) {
2116 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2117 }
2118 int klass_ref = cp->uncached_klass_ref_index_at(index);
2119 Klass* k_o;
2120 if (force_resolution) {
2121 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2122 } else {
2123 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2124 if (k_o == nullptr) return nullptr;
2125 }
2126 InstanceKlass* k = InstanceKlass::cast(k_o);
2127 Symbol* name = cp->uncached_name_ref_at(index);
2128 Symbol* sig = cp->uncached_signature_ref_at(index);
2129 methodHandle m (THREAD, k->find_method(name, sig));
2130 if (m.is_null()) {
2131 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2132 }
2133 oop method;
2134 if (m->is_object_constructor()) {
2135 method = Reflection::new_constructor(m, CHECK_NULL);
2136 } else {
2137 method = Reflection::new_method(m, true, CHECK_NULL);
2138 }
2139 return JNIHandles::make_local(THREAD, method);
2140 }
2141
2142 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2143 {
2144 JvmtiVMObjectAllocEventCollector oam;
2145 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2146 bounds_check(cp, index, CHECK_NULL);
2147 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2148 return res;
2149 }
2150 JVM_END
2151
2152 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2153 {
2154 JvmtiVMObjectAllocEventCollector oam;
2155 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2156 bounds_check(cp, index, CHECK_NULL);
2157 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2158 return res;
2159 }
2160 JVM_END
2161
2162 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2163 constantTag tag = cp->tag_at(index);
2164 if (!tag.is_field()) {
2165 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2166 }
2167 int klass_ref = cp->uncached_klass_ref_index_at(index);
2168 Klass* k_o;
2169 if (force_resolution) {
2170 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2171 } else {
2172 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2173 if (k_o == nullptr) return nullptr;
2174 }
2175 InstanceKlass* k = InstanceKlass::cast(k_o);
2176 Symbol* name = cp->uncached_name_ref_at(index);
2177 Symbol* sig = cp->uncached_signature_ref_at(index);
2178 fieldDescriptor fd;
2179 Klass* target_klass = k->find_field(name, sig, &fd);
2180 if (target_klass == nullptr) {
2181 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2182 }
2183 oop field = Reflection::new_field(&fd, CHECK_NULL);
2184 return JNIHandles::make_local(THREAD, field);
2185 }
2186
2187 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2188 {
2189 JvmtiVMObjectAllocEventCollector oam;
2190 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2191 bounds_check(cp, index, CHECK_NULL);
2192 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2193 return res;
2194 }
2195 JVM_END
2196
2197 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2198 {
2199 JvmtiVMObjectAllocEventCollector oam;
2200 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2201 bounds_check(cp, index, CHECK_NULL);
2202 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2203 return res;
2204 }
2205 JVM_END
2206
2207 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2208 {
2209 JvmtiVMObjectAllocEventCollector oam;
2210 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2211 bounds_check(cp, index, CHECK_NULL);
2212 constantTag tag = cp->tag_at(index);
2213 if (!tag.is_field_or_method()) {
2214 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2215 }
2216 int klass_ref = cp->uncached_klass_ref_index_at(index);
2217 Symbol* klass_name = cp->klass_name_at(klass_ref);
2218 Symbol* member_name = cp->uncached_name_ref_at(index);
2219 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2220 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2221 objArrayHandle dest(THREAD, dest_o);
2222 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2223 dest->obj_at_put(0, str());
2224 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2225 dest->obj_at_put(1, str());
2226 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2227 dest->obj_at_put(2, str());
2228 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2229 }
2230 JVM_END
2231
2232 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2233 {
2234 JvmtiVMObjectAllocEventCollector oam;
2235 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2236 bounds_check(cp, index, CHECK_0);
2237 constantTag tag = cp->tag_at(index);
2238 if (!tag.is_field_or_method()) {
2239 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2240 }
2241 return (jint) cp->uncached_klass_ref_index_at(index);
2242 }
2243 JVM_END
2244
2245 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2246 {
2247 JvmtiVMObjectAllocEventCollector oam;
2248 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2249 bounds_check(cp, index, CHECK_0);
2250 constantTag tag = cp->tag_at(index);
2251 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2252 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2253 }
2254 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2255 }
2256 JVM_END
2257
2258 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2259 {
2260 JvmtiVMObjectAllocEventCollector oam;
2261 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2262 bounds_check(cp, index, CHECK_NULL);
2263 constantTag tag = cp->tag_at(index);
2264 if (!tag.is_name_and_type()) {
2265 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2266 }
2267 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2268 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2269 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2270 objArrayHandle dest(THREAD, dest_o);
2271 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2272 dest->obj_at_put(0, str());
2273 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2274 dest->obj_at_put(1, str());
2275 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2276 }
2277 JVM_END
2278
2279 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2280 {
2281 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2282 bounds_check(cp, index, CHECK_0);
2283 constantTag tag = cp->tag_at(index);
2284 if (!tag.is_int()) {
2285 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2286 }
2287 return cp->int_at(index);
2288 }
2289 JVM_END
2290
2291 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2292 {
2293 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2294 bounds_check(cp, index, CHECK_(0L));
2295 constantTag tag = cp->tag_at(index);
2296 if (!tag.is_long()) {
2297 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2298 }
2299 return cp->long_at(index);
2300 }
2301 JVM_END
2302
2303 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2304 {
2305 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2306 bounds_check(cp, index, CHECK_(0.0f));
2307 constantTag tag = cp->tag_at(index);
2308 if (!tag.is_float()) {
2309 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2310 }
2311 return cp->float_at(index);
2312 }
2313 JVM_END
2314
2315 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2316 {
2317 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2318 bounds_check(cp, index, CHECK_(0.0));
2319 constantTag tag = cp->tag_at(index);
2320 if (!tag.is_double()) {
2321 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2322 }
2323 return cp->double_at(index);
2324 }
2325 JVM_END
2326
2327 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2328 {
2329 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2330 bounds_check(cp, index, CHECK_NULL);
2331 constantTag tag = cp->tag_at(index);
2332 if (!tag.is_string()) {
2333 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2334 }
2335 oop str = cp->string_at(index, CHECK_NULL);
2336 return (jstring) JNIHandles::make_local(THREAD, str);
2337 }
2338 JVM_END
2339
2340 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2341 {
2342 JvmtiVMObjectAllocEventCollector oam;
2343 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2344 bounds_check(cp, index, CHECK_NULL);
2345 constantTag tag = cp->tag_at(index);
2346 if (!tag.is_symbol()) {
2347 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2348 }
2349 Symbol* sym = cp->symbol_at(index);
2350 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2351 return (jstring) JNIHandles::make_local(THREAD, str());
2352 }
2353 JVM_END
2354
2355 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(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_0);
2359 constantTag tag = cp->tag_at(index);
2360 jbyte result = tag.value();
2361 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2362 // they are changed to the corresponding tags from the JVM spec, so that java code in
2363 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2364 if (tag.is_klass_or_reference()) {
2365 result = JVM_CONSTANT_Class;
2366 } else if (tag.is_string_index()) {
2367 result = JVM_CONSTANT_String;
2368 } else if (tag.is_method_type_in_error()) {
2369 result = JVM_CONSTANT_MethodType;
2370 } else if (tag.is_method_handle_in_error()) {
2371 result = JVM_CONSTANT_MethodHandle;
2372 } else if (tag.is_dynamic_constant_in_error()) {
2373 result = JVM_CONSTANT_Dynamic;
2374 }
2375 return result;
2376 }
2377 JVM_END
2378
2379 // Assertion support. //////////////////////////////////////////////////////////
2380
2381 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2382 assert(cls != nullptr, "bad class");
2383
2384 oop r = JNIHandles::resolve(cls);
2385 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2386 if (java_lang_Class::is_primitive(r)) return false;
2387
2388 Klass* k = java_lang_Class::as_Klass(r);
2389 assert(k->is_instance_klass(), "must be an instance klass");
2390 if (!k->is_instance_klass()) return false;
2391
2392 ResourceMark rm(THREAD);
2393 const char* name = k->name()->as_C_string();
2394 bool system_class = k->class_loader() == nullptr;
2395 return JavaAssertions::enabled(name, system_class);
2396
2397 JVM_END
2398
2399
2400 // Return a new AssertionStatusDirectives object with the fields filled in with
2401 // command-line assertion arguments (i.e., -ea, -da).
2402 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2403 JvmtiVMObjectAllocEventCollector oam;
2404 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2405 return JNIHandles::make_local(THREAD, asd);
2406 JVM_END
2407
2408 // Verification ////////////////////////////////////////////////////////////////////////////////
2409
2410 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2411
2412 // RedefineClasses support: bug 6214132 caused verification to fail.
2413 // All functions from this section, unless noted otherwise, should call the functions
2414 // get_klass_considering_redefinition(), or
2415 // get_instance_klass_considering_redefinition()
2416 // These functions return JvmtiThreadState::_scratch_class if the verifier
2417 // was invoked in the middle of the redefinition of cls.
2418 // See jvmtiThreadState.hpp for details.
2419
2420 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2421 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2422 if (k->is_instance_klass()) {
2423 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2424 } else {
2425 return k;
2426 }
2427 }
2428
2429 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2430 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2431 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2432 }
2433
2434 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2435 oop mirror = JNIHandles::resolve_non_null(cls);
2436 if (java_lang_Class::is_primitive(mirror)) {
2437 return JNI_FALSE;
2438 }
2439 Klass* k = java_lang_Class::as_Klass(mirror);
2440 // This isn't necessary since answer is the same because redefinition
2441 // has already checked this matches for the scratch class.
2442 // k = get_klass_considering_redefinition(cls, thread)
2443 jboolean result = k->is_interface();
2444 assert(!result || k->is_instance_klass(),
2445 "all interfaces are instance types");
2446 return result;
2447 JVM_END
2448
2449 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2450 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2451 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2452 return k->name()->as_utf8();
2453 JVM_END
2454
2455
2456 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2457 Klass* k = get_klass_considering_redefinition(cls, thread);
2458 // types will have length zero if this is not an InstanceKlass
2459 // (length is determined by call to JVM_GetClassCPEntriesCount)
2460 if (k->is_instance_klass()) {
2461 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2462 for (int index = cp->length() - 1; index >= 0; index--) {
2463 constantTag tag = cp->tag_at(index);
2464 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2465 }
2466 }
2467 JVM_END
2468
2469
2470 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2471 Klass* k = get_klass_considering_redefinition(cls, thread);
2472 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2473 JVM_END
2474
2475
2476 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2477 Klass* k = get_klass_considering_redefinition(cls, thread);
2478 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2479 JVM_END
2480
2481
2482 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2483 Klass* k = get_klass_considering_redefinition(cls, thread);
2484 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2485 JVM_END
2486
2487
2488 // The following methods, used for the verifier, are never called with
2489 // array klasses, so a direct cast to InstanceKlass is safe.
2490 // Typically, these methods are called in a loop with bounds determined
2491 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2492 // zero for arrays.
2493 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2494 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2495 Method* method = ik->methods()->at(method_index);
2496 int length = method->checked_exceptions_length();
2497 if (length > 0) {
2498 CheckedExceptionElement* table= method->checked_exceptions_start();
2499 for (int i = 0; i < length; i++) {
2500 exceptions[i] = table[i].class_cp_index;
2501 }
2502 }
2503 JVM_END
2504
2505
2506 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2507 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2508 Method* method = ik->methods()->at(method_index);
2509 return method->checked_exceptions_length();
2510 JVM_END
2511
2512
2513 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2514 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2515 Method* method = ik->methods()->at(method_index);
2516 memcpy(code, method->code_base(), method->code_size());
2517 JVM_END
2518
2519
2520 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2521 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2522 Method* method = ik->methods()->at(method_index);
2523 return method->code_size();
2524 JVM_END
2525
2526
2527 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2528 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2529 Method* method = ik->methods()->at(method_index);
2530 ExceptionTable extable(method);
2531 entry->start_pc = extable.start_pc(entry_index);
2532 entry->end_pc = extable.end_pc(entry_index);
2533 entry->handler_pc = extable.handler_pc(entry_index);
2534 entry->catchType = extable.catch_type_index(entry_index);
2535 JVM_END
2536
2537
2538 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2539 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2540 Method* method = ik->methods()->at(method_index);
2541 return method->exception_table_length();
2542 JVM_END
2543
2544
2545 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2546 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2547 Method* method = ik->methods()->at(method_index);
2548 return method->access_flags().as_method_flags();
2549 JVM_END
2550
2551
2552 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2553 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2554 return ik->field_access_flags(field_index);
2555 JVM_END
2556
2557
2558 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2559 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2560 Method* method = ik->methods()->at(method_index);
2561 return method->max_locals();
2562 JVM_END
2563
2564
2565 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2566 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2567 Method* method = ik->methods()->at(method_index);
2568 return method->size_of_parameters();
2569 JVM_END
2570
2571
2572 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2573 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2574 Method* method = ik->methods()->at(method_index);
2575 return method->verifier_max_stack();
2576 JVM_END
2577
2578
2579 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2580 ResourceMark rm(THREAD);
2581 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2582 Method* method = ik->methods()->at(method_index);
2583 return method->is_object_constructor();
2584 JVM_END
2585
2586
2587 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2588 ResourceMark rm(THREAD);
2589 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2590 Method* method = ik->methods()->at(method_index);
2591 return method->is_overpass();
2592 JVM_END
2593
2594 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2595 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2596 Method* method = ik->methods()->at(method_index);
2597 return method->name()->as_utf8();
2598 JVM_END
2599
2600
2601 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2602 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2603 Method* method = ik->methods()->at(method_index);
2604 return method->signature()->as_utf8();
2605 JVM_END
2606
2607 /**
2608 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2609 * read entries in the constant pool. Since the old verifier always
2610 * works on a copy of the code, it will not see any rewriting that
2611 * may possibly occur in the middle of verification. So it is important
2612 * that nothing it calls tries to use the cpCache instead of the raw
2613 * constant pool, so we must use cp->uncached_x methods when appropriate.
2614 */
2615 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2616 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2617 ConstantPool* cp = ik->constants();
2618 switch (cp->tag_at(cp_index).value()) {
2619 case JVM_CONSTANT_Fieldref:
2620 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2621 default:
2622 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2623 }
2624 ShouldNotReachHere();
2625 return nullptr;
2626 JVM_END
2627
2628
2629 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2630 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2631 ConstantPool* cp = ik->constants();
2632 switch (cp->tag_at(cp_index).value()) {
2633 case JVM_CONSTANT_InterfaceMethodref:
2634 case JVM_CONSTANT_Methodref:
2635 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2636 default:
2637 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2638 }
2639 ShouldNotReachHere();
2640 return nullptr;
2641 JVM_END
2642
2643
2644 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2645 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2646 ConstantPool* cp = ik->constants();
2647 switch (cp->tag_at(cp_index).value()) {
2648 case JVM_CONSTANT_InterfaceMethodref:
2649 case JVM_CONSTANT_Methodref:
2650 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2651 default:
2652 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2653 }
2654 ShouldNotReachHere();
2655 return nullptr;
2656 JVM_END
2657
2658
2659 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2660 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2661 ConstantPool* cp = ik->constants();
2662 switch (cp->tag_at(cp_index).value()) {
2663 case JVM_CONSTANT_Fieldref:
2664 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2665 default:
2666 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2667 }
2668 ShouldNotReachHere();
2669 return nullptr;
2670 JVM_END
2671
2672
2673 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2674 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2675 ConstantPool* cp = ik->constants();
2676 Symbol* classname = cp->klass_name_at(cp_index);
2677 return classname->as_utf8();
2678 JVM_END
2679
2680
2681 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2682 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2683 ConstantPool* cp = ik->constants();
2684 switch (cp->tag_at(cp_index).value()) {
2685 case JVM_CONSTANT_Fieldref: {
2686 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2687 Symbol* classname = cp->klass_name_at(class_index);
2688 return classname->as_utf8();
2689 }
2690 default:
2691 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2692 }
2693 ShouldNotReachHere();
2694 return nullptr;
2695 JVM_END
2696
2697
2698 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2699 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2700 ConstantPool* cp = ik->constants();
2701 switch (cp->tag_at(cp_index).value()) {
2702 case JVM_CONSTANT_Methodref:
2703 case JVM_CONSTANT_InterfaceMethodref: {
2704 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2705 Symbol* classname = cp->klass_name_at(class_index);
2706 return classname->as_utf8();
2707 }
2708 default:
2709 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2710 }
2711 ShouldNotReachHere();
2712 return nullptr;
2713 JVM_END
2714
2715
2716 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2717 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2718 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2719 ConstantPool* cp = ik->constants();
2720 ConstantPool* cp_called = ik_called->constants();
2721 switch (cp->tag_at(cp_index).value()) {
2722 case JVM_CONSTANT_Fieldref: {
2723 Symbol* name = cp->uncached_name_ref_at(cp_index);
2724 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2725 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2726 if (fs.name() == name && fs.signature() == signature) {
2727 return fs.access_flags().as_field_flags();
2728 }
2729 }
2730 return -1;
2731 }
2732 default:
2733 fatal("JVM_GetCPFieldModifiers: illegal constant");
2734 }
2735 ShouldNotReachHere();
2736 return 0;
2737 JVM_END
2738
2739
2740 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2741 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2742 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2743 ConstantPool* cp = ik->constants();
2744 switch (cp->tag_at(cp_index).value()) {
2745 case JVM_CONSTANT_Methodref:
2746 case JVM_CONSTANT_InterfaceMethodref: {
2747 Symbol* name = cp->uncached_name_ref_at(cp_index);
2748 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2749 Array<Method*>* methods = ik_called->methods();
2750 int methods_count = methods->length();
2751 for (int i = 0; i < methods_count; i++) {
2752 Method* method = methods->at(i);
2753 if (method->name() == name && method->signature() == signature) {
2754 return method->access_flags().as_method_flags();
2755 }
2756 }
2757 return -1;
2758 }
2759 default:
2760 fatal("JVM_GetCPMethodModifiers: illegal constant");
2761 }
2762 ShouldNotReachHere();
2763 return 0;
2764 JVM_END
2765
2766
2767 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2768
2769 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2770 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2771 JVM_END
2772
2773
2774 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2775 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2776 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2777 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2778 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2779 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2780 JVM_END
2781
2782 // Printing support //////////////////////////////////////////////////
2783 extern "C" {
2784
2785 ATTRIBUTE_PRINTF(3, 0)
2786 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2787 // Reject count values that are negative signed values converted to
2788 // unsigned; see bug 4399518, 4417214
2789 if ((intptr_t)count <= 0) return -1;
2790
2791 int result = os::vsnprintf(str, count, fmt, args);
2792 if (result > 0 && (size_t)result >= count) {
2793 result = -1;
2794 }
2795
2796 return result;
2797 }
2798
2799 ATTRIBUTE_PRINTF(3, 4)
2800 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2801 va_list args;
2802 int len;
2803 va_start(args, fmt);
2804 len = jio_vsnprintf(str, count, fmt, args);
2805 va_end(args);
2806 return len;
2807 }
2808
2809 ATTRIBUTE_PRINTF(2, 3)
2810 int jio_fprintf(FILE* f, const char *fmt, ...) {
2811 int len;
2812 va_list args;
2813 va_start(args, fmt);
2814 len = jio_vfprintf(f, fmt, args);
2815 va_end(args);
2816 return len;
2817 }
2818
2819 ATTRIBUTE_PRINTF(2, 0)
2820 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2821 if (Arguments::vfprintf_hook() != nullptr) {
2822 return Arguments::vfprintf_hook()(f, fmt, args);
2823 } else {
2824 return vfprintf(f, fmt, args);
2825 }
2826 }
2827
2828 ATTRIBUTE_PRINTF(1, 2)
2829 JNIEXPORT int jio_printf(const char *fmt, ...) {
2830 int len;
2831 va_list args;
2832 va_start(args, fmt);
2833 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2834 va_end(args);
2835 return len;
2836 }
2837
2838 // HotSpot specific jio method
2839 void jio_print(const char* s, size_t len) {
2840 // Try to make this function as atomic as possible.
2841 if (Arguments::vfprintf_hook() != nullptr) {
2842 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2843 } else {
2844 // Make an unused local variable to avoid warning from gcc compiler.
2845 bool dummy = os::write(defaultStream::output_fd(), s, len);
2846 }
2847 }
2848
2849 } // Extern C
2850
2851 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2852
2853 // In most of the JVM thread support functions we need to access the
2854 // thread through a ThreadsListHandle to prevent it from exiting and
2855 // being reclaimed while we try to operate on it. The exceptions to this
2856 // rule are when operating on the current thread, or if the monitor of
2857 // the target java.lang.Thread is locked at the Java level - in both
2858 // cases the target cannot exit.
2859
2860 static void thread_entry(JavaThread* thread, TRAPS) {
2861 HandleMark hm(THREAD);
2862 Handle obj(THREAD, thread->threadObj());
2863 JavaValue result(T_VOID);
2864 JavaCalls::call_virtual(&result,
2865 obj,
2866 vmClasses::Thread_klass(),
2867 vmSymbols::run_method_name(),
2868 vmSymbols::void_method_signature(),
2869 THREAD);
2870 }
2871
2872
2873 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2874 #if INCLUDE_CDS
2875 if (CDSConfig::allow_only_single_java_thread()) {
2876 // During java -Xshare:dump, if we allow multiple Java threads to
2877 // execute in parallel, symbols and classes may be loaded in
2878 // random orders which will make the resulting CDS archive
2879 // non-deterministic.
2880 //
2881 // Lucikly, during java -Xshare:dump, it's important to run only
2882 // the code in the main Java thread (which is NOT started here) that
2883 // creates the module graph, etc. It's safe to not start the other
2884 // threads which are launched by class static initializers
2885 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2886 if (log_is_enabled(Info, aot)) {
2887 ResourceMark rm;
2888 oop t = JNIHandles::resolve_non_null(jthread);
2889 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2890 }
2891 return;
2892 }
2893 #endif
2894 JavaThread *native_thread = nullptr;
2895
2896 // We cannot hold the Threads_lock when we throw an exception,
2897 // due to rank ordering issues. Example: we might need to grab the
2898 // Heap_lock while we construct the exception.
2899 bool throw_illegal_thread_state = false;
2900
2901 // We must release the Threads_lock before we can post a jvmti event
2902 // in Thread::start.
2903 {
2904 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2905 // Ensure that the C++ Thread and OSThread structures aren't freed before
2906 // we operate.
2907 MutexLocker ml(Threads_lock);
2908
2909 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2910 // re-starting an already started thread, so we should usually find
2911 // that the JavaThread is null. However for a JNI attached thread
2912 // there is a small window between the Thread object being created
2913 // (with its JavaThread set) and the update to its threadStatus, so we
2914 // have to check for this
2915 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2916 throw_illegal_thread_state = true;
2917 } else {
2918 jlong size =
2919 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2920 // Allocate the C++ Thread structure and create the native thread. The
2921 // stack size retrieved from java is 64-bit signed, but the constructor takes
2922 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2923 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2924 // - Avoid passing negative values which would result in really large stacks.
2925 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2926 size_t sz = size > 0 ? (size_t) size : 0;
2927 native_thread = new JavaThread(&thread_entry, sz);
2928
2929 // At this point it may be possible that no osthread was created for the
2930 // JavaThread due to lack of memory. Check for this situation and throw
2931 // an exception if necessary. Eventually we may want to change this so
2932 // that we only grab the lock if the thread was created successfully -
2933 // then we can also do this check and throw the exception in the
2934 // JavaThread constructor.
2935 if (native_thread->osthread() != nullptr) {
2936 // Note: the current thread is not being used within "prepare".
2937 native_thread->prepare(jthread);
2938 }
2939 }
2940 }
2941
2942 if (throw_illegal_thread_state) {
2943 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2944 }
2945
2946 assert(native_thread != nullptr, "Starting null thread?");
2947
2948 if (native_thread->osthread() == nullptr) {
2949 ResourceMark rm(thread);
2950 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2951 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2952 // No one should hold a reference to the 'native_thread'.
2953 native_thread->smr_delete();
2954 if (JvmtiExport::should_post_resource_exhausted()) {
2955 JvmtiExport::post_resource_exhausted(
2956 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2957 os::native_thread_creation_failed_msg());
2958 }
2959 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2960 os::native_thread_creation_failed_msg());
2961 }
2962
2963 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2964
2965 Thread::start(native_thread);
2966
2967 JVM_END
2968
2969
2970 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2971 ThreadsListHandle tlh(thread);
2972 oop java_thread = nullptr;
2973 JavaThread* receiver = nullptr;
2974 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2975 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2976
2977 if (is_alive) {
2978 // jthread refers to a live JavaThread.
2979 Thread::set_priority(receiver, (ThreadPriority)prio);
2980 }
2981 // Implied else: If the JavaThread hasn't started yet, then the
2982 // priority set in the java.lang.Thread object above will be pushed
2983 // down when it does start.
2984 JVM_END
2985
2986
2987 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
2988 HOTSPOT_THREAD_YIELD();
2989 os::naked_yield();
2990 JVM_END
2991
2992 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
2993 if (nanos < 0) {
2994 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
2995 }
2996
2997 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
2998 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
2999 }
3000
3001 // Save current thread state and restore it at the end of this block.
3002 // And set new thread state to SLEEPING.
3003 JavaThreadSleepState jtss(thread);
3004
3005 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3006
3007 if (nanos == 0) {
3008 os::naked_yield();
3009 } else {
3010 ThreadState old_state = thread->osthread()->get_state();
3011 thread->osthread()->set_state(SLEEPING);
3012 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3013 // An asynchronous exception could have been thrown on
3014 // us while we were sleeping. We do not overwrite those.
3015 if (!HAS_PENDING_EXCEPTION) {
3016 HOTSPOT_THREAD_SLEEP_END(1);
3017 if (!thread->has_async_exception_condition()) {
3018 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3019 // to properly restore the thread state. That's likely wrong.
3020 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3021 }
3022 }
3023 }
3024 thread->osthread()->set_state(old_state);
3025 }
3026 HOTSPOT_THREAD_SLEEP_END(0);
3027 JVM_END
3028
3029 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3030 oop jthread = thread->threadObj();
3031 assert(jthread != nullptr, "no current carrier thread!");
3032 return JNIHandles::make_local(THREAD, jthread);
3033 JVM_END
3034
3035 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3036 oop theThread = thread->vthread();
3037 assert(theThread != (oop)nullptr, "no current thread!");
3038 return JNIHandles::make_local(THREAD, theThread);
3039 JVM_END
3040
3041 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3042 jobject theThread))
3043 oop threadObj = JNIHandles::resolve(theThread);
3044 thread->set_vthread(threadObj);
3045
3046 // Set _monitor_owner_id of new current Thread
3047 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3048
3049 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3050 JVM_END
3051
3052 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3053 return ThreadIdentifier::unsafe_offset();
3054 JVM_END
3055
3056 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3057 ThreadsListHandle tlh(thread);
3058 JavaThread* receiver = nullptr;
3059 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3060 if (is_alive) {
3061 // jthread refers to a live JavaThread.
3062 receiver->interrupt();
3063 }
3064 JVM_END
3065
3066 // Return true iff the current thread has locked the object passed in
3067
3068 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3069 if (obj == nullptr) {
3070 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3071 }
3072 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3073 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3074 JVM_END
3075
3076 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3077 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3078 return JNIHandles::make_local(THREAD, trace);
3079 JVM_END
3080
3081 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3082 #if INCLUDE_JVMTI
3083 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3084 return JNIHandles::make_local(THREAD, snapshot);
3085 #else
3086 THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
3087 #endif
3088 JVM_END
3089
3090 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3091 // We don't use a ThreadsListHandle here because the current thread
3092 // must be alive.
3093 oop java_thread = JNIHandles::resolve_non_null(jthread);
3094 JavaThread* thr = java_lang_Thread::thread(java_thread);
3095 if (thread == thr && !thr->has_attached_via_jni()) {
3096 // Thread naming is only supported for the current thread and
3097 // we don't set the name of an attached thread to avoid stepping
3098 // on other programs.
3099 ResourceMark rm(thread);
3100 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3101 os::set_native_thread_name(thread_name);
3102 }
3103 JVM_END
3104
3105 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3106 oop theCache = thread->scopedValueCache();
3107 return JNIHandles::make_local(THREAD, theCache);
3108 JVM_END
3109
3110 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3111 jobject theCache))
3112 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3113 thread->set_scopedValueCache(objs);
3114 JVM_END
3115
3116
3117 // java.lang.Package ////////////////////////////////////////////////////////////////
3118
3119
3120 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3121 ResourceMark rm(THREAD);
3122 JvmtiVMObjectAllocEventCollector oam;
3123 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3124 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3125 return (jstring) JNIHandles::make_local(THREAD, result);
3126 JVM_END
3127
3128
3129 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3130 JvmtiVMObjectAllocEventCollector oam;
3131 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3132 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3133 JVM_END
3134
3135
3136 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3137
3138
3139 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3140 MonitorLocker ml(Heap_lock);
3141 oop ref = Universe::reference_pending_list();
3142 if (ref != nullptr) {
3143 Universe::clear_reference_pending_list();
3144 }
3145 return JNIHandles::make_local(THREAD, ref);
3146 JVM_END
3147
3148 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3149 MonitorLocker ml(Heap_lock);
3150 return Universe::has_reference_pending_list();
3151 JVM_END
3152
3153 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3154 MonitorLocker ml(Heap_lock);
3155 while (!Universe::has_reference_pending_list()) {
3156 ml.wait();
3157 }
3158 JVM_END
3159
3160 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3161 oop ref_oop = JNIHandles::resolve_non_null(ref);
3162 // PhantomReference has its own implementation of get().
3163 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3164 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3165 return JNIHandles::make_local(THREAD, referent);
3166 JVM_END
3167
3168 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3169 oop ref_oop = JNIHandles::resolve_non_null(ref);
3170 // PhantomReference has its own implementation of refersTo().
3171 // See: JVM_PhantomReferenceRefersTo
3172 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3173 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3174 return referent == JNIHandles::resolve(o);
3175 JVM_END
3176
3177 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3178 oop ref_oop = JNIHandles::resolve_non_null(ref);
3179 // FinalReference has it's own implementation of clear().
3180 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3181 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3182 // If the referent has already been cleared then done.
3183 // However, if the referent is dead but has not yet been cleared by
3184 // concurrent reference processing, it should NOT be cleared here.
3185 // Instead, clearing should be left to the GC. Clearing it here could
3186 // detectably lose an expected notification, which is impossible with
3187 // STW reference processing. The clearing in enqueue() doesn't have
3188 // this problem, since the enqueue covers the notification, but it's not
3189 // worth the effort to handle that case specially.
3190 return;
3191 }
3192 java_lang_ref_Reference::clear_referent(ref_oop);
3193 JVM_END
3194
3195
3196 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3197
3198
3199 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3200 oop ref_oop = JNIHandles::resolve_non_null(ref);
3201 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3202 return referent == JNIHandles::resolve(o);
3203 JVM_END
3204
3205
3206 // ObjectInputStream ///////////////////////////////////////////////////////////////
3207
3208 // Return the first user-defined class loader up the execution stack, or null
3209 // if only code from the bootstrap or platform class loader is on the stack.
3210
3211 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3212 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3213 InstanceKlass* ik = vfst.method()->method_holder();
3214 oop loader = ik->class_loader();
3215 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3216 return JNIHandles::make_local(THREAD, loader);
3217 }
3218 }
3219 return nullptr;
3220 JVM_END
3221
3222
3223 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3224
3225
3226 // resolve array handle and check arguments
3227 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3228 if (arr == nullptr) {
3229 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3230 }
3231 oop a = JNIHandles::resolve_non_null(arr);
3232 if (!a->is_array()) {
3233 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3234 } else if (type_array_only && !a->is_typeArray()) {
3235 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3236 }
3237 return arrayOop(a);
3238 }
3239
3240
3241 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3242 arrayOop a = check_array(env, arr, false, CHECK_0);
3243 return a->length();
3244 JVM_END
3245
3246
3247 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3248 JvmtiVMObjectAllocEventCollector oam;
3249 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3250 jvalue value;
3251 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3252 oop box = Reflection::box(&value, type, CHECK_NULL);
3253 return JNIHandles::make_local(THREAD, box);
3254 JVM_END
3255
3256
3257 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3258 jvalue value;
3259 value.i = 0; // to initialize value before getting used in CHECK
3260 arrayOop a = check_array(env, arr, true, CHECK_(value));
3261 assert(a->is_typeArray(), "just checking");
3262 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3263 BasicType wide_type = (BasicType) wCode;
3264 if (type != wide_type) {
3265 Reflection::widen(&value, type, wide_type, CHECK_(value));
3266 }
3267 return value;
3268 JVM_END
3269
3270
3271 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3272 arrayOop a = check_array(env, arr, false, CHECK);
3273 oop box = JNIHandles::resolve(val);
3274 jvalue value;
3275 value.i = 0; // to initialize value before getting used in CHECK
3276 BasicType value_type;
3277 if (a->is_objArray()) {
3278 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3279 value_type = Reflection::unbox_for_regular_object(box, &value);
3280 } else {
3281 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3282 }
3283 Reflection::array_set(&value, a, index, value_type, CHECK);
3284 JVM_END
3285
3286
3287 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3288 arrayOop a = check_array(env, arr, true, CHECK);
3289 assert(a->is_typeArray(), "just checking");
3290 BasicType value_type = (BasicType) vCode;
3291 Reflection::array_set(&v, a, index, value_type, CHECK);
3292 JVM_END
3293
3294
3295 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3296 JvmtiVMObjectAllocEventCollector oam;
3297 oop element_mirror = JNIHandles::resolve(eltClass);
3298 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3299 return JNIHandles::make_local(THREAD, result);
3300 JVM_END
3301
3302
3303 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3304 JvmtiVMObjectAllocEventCollector oam;
3305 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3306 oop element_mirror = JNIHandles::resolve(eltClass);
3307 assert(dim_array->is_typeArray(), "just checking");
3308 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3309 return JNIHandles::make_local(THREAD, result);
3310 JVM_END
3311
3312
3313 // Library support ///////////////////////////////////////////////////////////////////////////
3314
3315 JVM_LEAF(void*, JVM_LoadZipLibrary())
3316 return ZipLibrary::handle();
3317 JVM_END
3318
3319 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3320 //%note jvm_ct
3321 char ebuf[1024];
3322 void *load_result;
3323 {
3324 ThreadToNativeFromVM ttnfvm(thread);
3325 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3326 }
3327 if (load_result == nullptr) {
3328 if (throwException) {
3329 char msg[1024];
3330 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3331 // Since 'ebuf' may contain a string encoded using
3332 // platform encoding scheme, we need to pass
3333 // Exceptions::unsafe_to_utf8 to the new_exception method
3334 // as the last argument. See bug 6367357.
3335 Handle h_exception =
3336 Exceptions::new_exception(thread,
3337 vmSymbols::java_lang_UnsatisfiedLinkError(),
3338 msg, Exceptions::unsafe_to_utf8);
3339
3340 THROW_HANDLE_NULL(h_exception);
3341 } else {
3342 log_info(library)("Failed to load library %s", name);
3343 return load_result;
3344 }
3345 }
3346 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3347 return load_result;
3348 JVM_END
3349
3350
3351 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3352 os::dll_unload(handle);
3353 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3354 JVM_END
3355
3356
3357 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3358 void* find_result = os::dll_lookup(handle, name);
3359 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3360 find_result != nullptr ? "Found" : "Failed to find",
3361 name, p2i(handle));
3362 return find_result;
3363 JVM_END
3364
3365
3366 // JNI version ///////////////////////////////////////////////////////////////////////////////
3367
3368 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3369 return Threads::is_supported_jni_version_including_1_1(version);
3370 JVM_END
3371
3372
3373 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3374 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3375 JVM_END
3376
3377 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3378 return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3379 JVM_END
3380
3381 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3382 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3383 JVM_END
3384
3385 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3386 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3387 JVM_END
3388
3389 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3390 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3391 JVM_END
3392
3393 // String support ///////////////////////////////////////////////////////////////////////////
3394
3395 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3396 JvmtiVMObjectAllocEventCollector oam;
3397 if (str == nullptr) return nullptr;
3398 oop string = JNIHandles::resolve_non_null(str);
3399 oop result = StringTable::intern(string, CHECK_NULL);
3400 return (jstring) JNIHandles::make_local(THREAD, result);
3401 JVM_END
3402
3403
3404 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3405
3406 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3407 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3408 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3409 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3410 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3411 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3412
3413
3414 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3415 VM_Exit::block_if_vm_exited();
3416 return new PlatformMutex();
3417 }
3418
3419
3420 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3421 VM_Exit::block_if_vm_exited();
3422 delete ((PlatformMutex*) mon);
3423 }
3424
3425
3426 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3427 VM_Exit::block_if_vm_exited();
3428 ((PlatformMutex*) mon)->lock();
3429 return 0;
3430 }
3431
3432
3433 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3434 VM_Exit::block_if_vm_exited();
3435 ((PlatformMutex*) mon)->unlock();
3436 }
3437
3438
3439 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3440
3441 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3442 Handle loader, jboolean throwError, TRAPS) {
3443 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3444
3445 // Check if we should initialize the class
3446 if (init && klass->is_instance_klass()) {
3447 klass->initialize(CHECK_NULL);
3448 }
3449 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3450 }
3451
3452
3453 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3454
3455 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3456 Handle method_handle;
3457 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3458 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3459 Handle receiver(THREAD, JNIHandles::resolve(obj));
3460 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3461 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3462
3463 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3464 jobject res = JNIHandles::make_local(THREAD, result);
3465 if (JvmtiExport::should_post_vm_object_alloc()) {
3466 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3467 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3468 if (java_lang_Class::is_primitive(ret_type)) {
3469 // Only for primitive type vm allocates memory for java object.
3470 // See box() method.
3471 JvmtiExport::post_vm_object_alloc(thread, result);
3472 }
3473 }
3474 return res;
3475 } else {
3476 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3477 }
3478 JVM_END
3479
3480
3481 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3482 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3483 assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3484 oop constructor_mirror = JNIHandles::resolve(c);
3485 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3486 jobject res = JNIHandles::make_local(THREAD, result);
3487 if (JvmtiExport::should_post_vm_object_alloc()) {
3488 JvmtiExport::post_vm_object_alloc(thread, result);
3489 }
3490 return res;
3491 JVM_END
3492
3493 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3494 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3495 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3496 JVM_END
3497
3498 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3499 jclass caller,
3500 jstring interfaceMethodName,
3501 jobject factoryType,
3502 jobject interfaceMethodType,
3503 jobject implementationMember,
3504 jobject dynamicMethodType,
3505 jclass lambdaProxyClass))
3506 #if INCLUDE_CDS
3507 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3508 return;
3509 }
3510
3511 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3512 if (caller_ik->is_hidden()) {
3513 // Hidden classes not of type lambda proxy classes are currently not being archived.
3514 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3515 // registered for archiving.
3516 return;
3517 }
3518 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3519 assert(lambda_ik->is_hidden(), "must be a hidden class");
3520 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3521
3522 Symbol* interface_method_name = nullptr;
3523 if (interfaceMethodName != nullptr) {
3524 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3525 }
3526 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3527 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3528
3529 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3530 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3531
3532 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3533 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3534 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3535
3536 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3537 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3538
3539 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3540 interface_method_type, m, dynamic_method_type, THREAD);
3541 #endif // INCLUDE_CDS
3542 JVM_END
3543
3544 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3545 jclass caller,
3546 jstring interfaceMethodName,
3547 jobject factoryType,
3548 jobject interfaceMethodType,
3549 jobject implementationMember,
3550 jobject dynamicMethodType))
3551 #if INCLUDE_CDS
3552
3553 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3554 implementationMember == nullptr || dynamicMethodType == nullptr) {
3555 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3556 }
3557
3558 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3559 if (!caller_ik->in_aot_cache()) {
3560 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3561 return nullptr;
3562 }
3563
3564 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3565 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3566 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3567
3568 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3569 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3570
3571 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3572 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3573 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3574
3575 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3576 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3577
3578 InstanceKlass* loaded_lambda =
3579 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3580 interface_method_type, m, dynamic_method_type,
3581 CHECK_(nullptr));
3582 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3583 #else
3584 return nullptr;
3585 #endif // INCLUDE_CDS
3586 JVM_END
3587
3588 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3589 if (CDSConfig::is_dumping_static_archive()) {
3590 // We do this so that the default CDS archive can be deterministic.
3591 const char* release = VM_Version::vm_release();
3592 const char* dbg_level = VM_Version::jdk_debug_level();
3593 const char* version = VM_Version::internal_vm_info_string();
3594 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3595 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3596 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3597 seed += (jlong)VM_Version::vm_major_version();
3598 seed += (jlong)VM_Version::vm_minor_version();
3599 seed += (jlong)VM_Version::vm_security_version();
3600 seed += (jlong)VM_Version::vm_patch_version();
3601 if (seed == 0) { // don't let this ever be zero.
3602 seed = 0x87654321;
3603 }
3604 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3605 return seed;
3606 } else {
3607 return 0;
3608 }
3609 JVM_END
3610
3611 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3612 return CDSConfig::get_status();
3613 JVM_END
3614
3615 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3616 #if INCLUDE_CDS
3617 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3618 if (line != nullptr) {
3619 ResourceMark rm(THREAD);
3620 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3621 char* c_line = java_lang_String::as_utf8_string(h_line());
3622 if (CDSConfig::is_dumping_dynamic_archive()) {
3623 // Note: LambdaFormInvokers::append take same format which is not
3624 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3625 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3626 }
3627 if (ClassListWriter::is_enabled()) {
3628 ClassListWriter w;
3629 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3630 }
3631 }
3632 #endif // INCLUDE_CDS
3633 JVM_END
3634
3635 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3636 #if INCLUDE_CDS
3637 ResourceMark rm(THREAD);
3638 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3639 char* file_name = java_lang_String::as_utf8_string(file_handle());
3640 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3641 #endif // INCLUDE_CDS
3642 JVM_END
3643
3644 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3645 #if INCLUDE_CDS
3646 ResourceMark rm(THREAD);
3647 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3648 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3649 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3650 #endif // INCLUDE_CDS
3651 JVM_END
3652
3653 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3654 #if INCLUDE_CDS
3655 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3656 if (!k->is_instance_klass()) {
3657 return false;
3658 } else {
3659 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3660 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3661 // This class will be cached in AOT-initialized state. No need for init barriers.
3662 return false;
3663 } else {
3664 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3665 // must emit barriers to ensure class initialization during production run.
3666 ResourceMark rm(THREAD);
3667 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3668 return true;
3669 }
3670 }
3671 #else
3672 return false;
3673 #endif // INCLUDE_CDS
3674 JVM_END
3675
3676 // Returns an array of all live Thread objects (VM internal JavaThreads,
3677 // jvmti agent threads, and JNI attaching threads are skipped)
3678 // See CR 6404306 regarding JNI attaching threads
3679 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3680 ResourceMark rm(THREAD);
3681 ThreadsListEnumerator tle(THREAD, false, false);
3682 JvmtiVMObjectAllocEventCollector oam;
3683
3684 int num_threads = tle.num_threads();
3685 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3686 objArrayHandle threads_ah(THREAD, r);
3687
3688 for (int i = 0; i < num_threads; i++) {
3689 Handle h = tle.get_threadObj(i);
3690 threads_ah->obj_at_put(i, h());
3691 }
3692
3693 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3694 JVM_END
3695
3696
3697 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3698 // Return StackTraceElement[][], each element is the stack trace of a thread in
3699 // the corresponding entry in the given threads array
3700 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3701 JvmtiVMObjectAllocEventCollector oam;
3702
3703 // Check if threads is null
3704 if (threads == nullptr) {
3705 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3706 }
3707
3708 objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3709 objArrayHandle ah(THREAD, a);
3710 int num_threads = ah->length();
3711 // check if threads is non-empty array
3712 if (num_threads == 0) {
3713 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3714 }
3715
3716 // check if threads is not an array of objects of Thread class
3717 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3718 if (k != vmClasses::Thread_klass()) {
3719 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3720 }
3721 refArrayHandle rah(THREAD, (refArrayOop)ah()); // j.l.Thread is an identity class, arrays are always reference arrays
3722
3723 ResourceMark rm(THREAD);
3724
3725 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3726 for (int i = 0; i < num_threads; i++) {
3727 oop thread_obj = rah->obj_at(i);
3728 instanceHandle h(THREAD, (instanceOop) thread_obj);
3729 thread_handle_array->append(h);
3730 }
3731
3732 // The JavaThread references in thread_handle_array are validated
3733 // in VM_ThreadDump::doit().
3734 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3735 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3736
3737 JVM_END
3738
3739 // JVM monitoring and management support
3740 JVM_LEAF(void*, JVM_GetManagement(jint version))
3741 return Management::get_jmm_interface(version);
3742 JVM_END
3743
3744 // com.sun.tools.attach.VirtualMachine agent properties support
3745 //
3746 // Initialize the agent properties with the properties maintained in the VM
3747 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3748 ResourceMark rm;
3749
3750 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3751
3752 PUTPROP(props, "sun.java.command", Arguments::java_command());
3753 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3754 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3755 return properties;
3756 JVM_END
3757
3758 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3759 {
3760 JvmtiVMObjectAllocEventCollector oam;
3761
3762 if (ofClass == nullptr) {
3763 return nullptr;
3764 }
3765 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3766 // Special handling for primitive objects
3767 if (java_lang_Class::is_primitive(mirror())) {
3768 return nullptr;
3769 }
3770 Klass* k = java_lang_Class::as_Klass(mirror());
3771 if (!k->is_instance_klass()) {
3772 return nullptr;
3773 }
3774 InstanceKlass* ik = InstanceKlass::cast(k);
3775 int encl_method_class_idx = ik->enclosing_method_class_index();
3776 if (encl_method_class_idx == 0) {
3777 return nullptr;
3778 }
3779 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3780 objArrayHandle dest(THREAD, dest_o);
3781 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3782 dest->obj_at_put(0, enc_k->java_mirror());
3783 int encl_method_method_idx = ik->enclosing_method_method_index();
3784 if (encl_method_method_idx != 0) {
3785 Symbol* sym = ik->constants()->symbol_at(
3786 extract_low_short_from_int(
3787 ik->constants()->name_and_type_at(encl_method_method_idx)));
3788 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3789 dest->obj_at_put(1, str());
3790 sym = ik->constants()->symbol_at(
3791 extract_high_short_from_int(
3792 ik->constants()->name_and_type_at(encl_method_method_idx)));
3793 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3794 dest->obj_at_put(2, str());
3795 }
3796 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3797 }
3798 JVM_END
3799
3800 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3801 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3802 ResourceMark rm(THREAD);
3803
3804 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3805 return nullptr;
3806 }
3807
3808 char** vm_flags = Arguments::jvm_flags_array();
3809 char** vm_args = Arguments::jvm_args_array();
3810 int num_flags = Arguments::num_jvm_flags();
3811 int num_args = Arguments::num_jvm_args();
3812
3813 InstanceKlass* ik = vmClasses::String_klass();
3814 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3815 objArrayHandle result_h(THREAD, r);
3816
3817 int index = 0;
3818 for (int j = 0; j < num_flags; j++, index++) {
3819 Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3820 result_h->obj_at_put(index, h());
3821 }
3822 for (int i = 0; i < num_args; i++, index++) {
3823 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3824 result_h->obj_at_put(index, h());
3825 }
3826 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3827 JVM_END
3828
3829 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3830 return os::get_signal_number(name);
3831 JVM_END
3832
3833 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3834 #if INCLUDE_JVMTI
3835 if (!DoJVMTIVirtualThreadTransitions) {
3836 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3837 return;
3838 }
3839 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3840 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3841 } else {
3842 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3843 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3844 }
3845 #endif
3846 JVM_END
3847
3848 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3849 #if INCLUDE_JVMTI
3850 if (!DoJVMTIVirtualThreadTransitions) {
3851 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3852 return;
3853 }
3854 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3855 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3856 } else {
3857 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3858 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3859 }
3860 #endif
3861 JVM_END
3862
3863 // If notifications are disabled then just update the VTMS transition bit and return.
3864 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3865 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3866 #if INCLUDE_JVMTI
3867 if (!DoJVMTIVirtualThreadTransitions) {
3868 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3869 return;
3870 }
3871 if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3872 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3873 } else {
3874 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3875 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3876 }
3877 #endif
3878 JVM_END
3879
3880 // If notifications are disabled then just update the VTMS transition bit and return.
3881 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3882 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
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_unmount(vthread, hide);
3890 } else {
3891 // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3892 JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3893 }
3894 #endif
3895 JVM_END
3896
3897 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3898 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3899 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3900 #if INCLUDE_JVMTI
3901 if (!DoJVMTIVirtualThreadTransitions) {
3902 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3903 return;
3904 }
3905 assert(thread->is_disable_suspend() != (bool)enter,
3906 "nested or unbalanced monitor enter/exit is not allowed");
3907 thread->toggle_is_disable_suspend();
3908 #endif
3909 JVM_END
3910
3911 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3912 #if INCLUDE_JFR
3913 freeze_result result = THREAD->last_freeze_fail_result();
3914 assert(result != freeze_ok, "sanity check");
3915 EventVirtualThreadPinned event(UNTIMED);
3916 event.set_starttime(THREAD->last_freeze_fail_time());
3917 if (event.should_commit()) {
3918 ResourceMark rm(THREAD);
3919 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3920 THREAD->post_vthread_pinned_event(&event, str, result);
3921 }
3922 #endif
3923 JVM_END
3924
3925 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3926 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3927 assert(parkEvent != nullptr, "not initialized");
3928
3929 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3930 oop vthread_head = nullptr;
3931 while (true) {
3932 if (list_head.peek() != nullptr) {
3933 for (;;) {
3934 oop head = list_head.resolve();
3935 if (list_head.cmpxchg(head, nullptr) == head) {
3936 return JNIHandles::make_local(THREAD, head);
3937 }
3938 }
3939 }
3940 ThreadBlockInVM tbivm(THREAD);
3941 parkEvent->park();
3942 }
3943 JVM_END
3944 /*
3945 * Return the current class's class file version. The low order 16 bits of the
3946 * returned jint contain the class's major version. The high order 16 bits
3947 * contain the class's minor version.
3948 */
3949 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3950 oop mirror = JNIHandles::resolve_non_null(current);
3951 if (java_lang_Class::is_primitive(mirror)) {
3952 // return latest major version and minor version of 0.
3953 return JVM_CLASSFILE_MAJOR_VERSION;
3954 }
3955 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3956 return (ik->minor_version() << 16) | ik->major_version();
3957 JVM_END
3958
3959 /*
3960 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3961 * get the value will see a materialized value and not a scalar-replaced
3962 * null value.
3963 */
3964 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3965 JVM_EnsureMaterializedForStackWalk(env, value);
3966 JVM_END
3967
3968 /*
3969 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3970 */
3971 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3972 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3973 JVM_END