1 /*
2 * Copyright (c) 1997, 2026, 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/inlineKlass.inline.hpp"
63 #include "oops/instanceKlass.hpp"
64 #include "oops/klass.inline.hpp"
65 #include "oops/method.hpp"
66 #include "oops/objArrayKlass.hpp"
67 #include "oops/objArrayOop.inline.hpp"
68 #include "oops/oop.inline.hpp"
69 #include "oops/oopCast.inline.hpp"
70 #include "oops/recordComponent.hpp"
71 #include "oops/refArrayOop.inline.hpp"
72 #include "oops/valuePayload.inline.hpp"
73 #include "prims/foreignGlobals.hpp"
74 #include "prims/jvm_misc.hpp"
75 #include "prims/jvmtiExport.hpp"
76 #include "prims/jvmtiThreadState.inline.hpp"
77 #include "prims/stackwalk.hpp"
78 #include "runtime/arguments.hpp"
79 #include "runtime/atomicAccess.hpp"
80 #include "runtime/continuation.hpp"
81 #include "runtime/deoptimization.hpp"
82 #include "runtime/globals_extension.hpp"
83 #include "runtime/handles.inline.hpp"
84 #include "runtime/handshake.hpp"
85 #include "runtime/init.hpp"
86 #include "runtime/interfaceSupport.inline.hpp"
87 #include "runtime/java.hpp"
88 #include "runtime/javaCalls.hpp"
89 #include "runtime/javaThread.hpp"
90 #include "runtime/jfieldIDWorkaround.hpp"
91 #include "runtime/jniHandles.inline.hpp"
92 #include "runtime/mountUnmountDisabler.hpp"
93 #include "runtime/os.inline.hpp"
94 #include "runtime/osThread.hpp"
95 #include "runtime/perfData.hpp"
96 #include "runtime/reflection.hpp"
97 #include "runtime/synchronizer.hpp"
98 #include "runtime/threadIdentifier.hpp"
99 #include "runtime/threadSMR.hpp"
100 #include "runtime/vframe.inline.hpp"
101 #include "runtime/vm_version.hpp"
102 #include "runtime/vmOperations.hpp"
103 #include "services/attachListener.hpp"
104 #include "services/management.hpp"
105 #include "services/threadService.hpp"
106 #include "utilities/checkedCast.hpp"
107 #include "utilities/copy.hpp"
108 #include "utilities/defaultStream.hpp"
109 #include "utilities/dtrace.hpp"
110 #include "utilities/events.hpp"
111 #include "utilities/macros.hpp"
112 #include "utilities/utf8.hpp"
113 #include "utilities/zipLibrary.hpp"
114 #if INCLUDE_CDS
115 #include "classfile/systemDictionaryShared.hpp"
116 #endif
117 #if INCLUDE_JFR
118 #include "jfr/jfr.hpp"
119 #endif
120 #if INCLUDE_MANAGEMENT
121 #include "services/finalizerService.hpp"
122 #endif
123
124 #include <errno.h>
125
126 /*
127 NOTE about use of any ctor or function call that can trigger a safepoint/GC:
128 such ctors and calls MUST NOT come between an oop declaration/init and its
129 usage because if objects are move this may cause various memory stomps, bus
130 errors and segfaults. Here is a cookbook for causing so called "naked oop
131 failures":
132
133 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
134 // Object address to be held directly in mirror & not visible to GC
135 oop mirror = JNIHandles::resolve_non_null(ofClass);
136
137 // If this ctor can hit a safepoint, moving objects around, then
138 ComplexConstructor foo;
139
140 // Boom! mirror may point to JUNK instead of the intended object
141 (some dereference of mirror)
142
143 // Here's another call that may block for GC, making mirror stale
144 MutexLocker ml(some_lock);
145
146 // And here's an initializer that can result in a stale oop
147 // all in one step.
148 oop o = call_that_can_throw_exception(TRAPS);
149
150
151 The solution is to keep the oop declaration BELOW the ctor or function
152 call that might cause a GC, do another resolve to reassign the oop, or
153 consider use of a Handle instead of an oop so there is immunity from object
154 motion. But note that the "QUICK" entries below do not have a handlemark
155 and thus can only support use of handles passed in.
156 */
157
158 extern void trace_class_resolution(Klass* to_class) {
159 ResourceMark rm;
160 int line_number = -1;
161 const char * source_file = nullptr;
162 const char * trace = "explicit";
163 InstanceKlass* caller = nullptr;
164 JavaThread* jthread = JavaThread::current();
165 if (jthread->has_last_Java_frame()) {
166 vframeStream vfst(jthread);
167
168 // Scan up the stack skipping ClassLoader frames.
169 Method* last_caller = nullptr;
170
171 while (!vfst.at_end()) {
172 Method* m = vfst.method();
173 if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
174 break;
175 }
176 last_caller = m;
177 vfst.next();
178 }
179 // if this is called from Class.forName0 and that is called from Class.forName,
180 // then print the caller of Class.forName. If this is Class.loadClass, then print
181 // that caller, otherwise keep quiet since this should be picked up elsewhere.
182 bool found_it = false;
183 if (!vfst.at_end() &&
184 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
185 vfst.method()->name() == vmSymbols::forName0_name()) {
186 vfst.next();
187 if (!vfst.at_end() &&
188 vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
189 vfst.method()->name() == vmSymbols::forName_name()) {
190 vfst.next();
191 found_it = true;
192 }
193 } else if (last_caller != nullptr &&
194 last_caller->method_holder()->name() ==
195 vmSymbols::java_lang_ClassLoader() &&
196 last_caller->name() == vmSymbols::loadClass_name()) {
197 found_it = true;
198 } else if (!vfst.at_end()) {
199 if (vfst.method()->is_native()) {
200 // JNI call
201 found_it = true;
202 }
203 }
204 if (found_it && !vfst.at_end()) {
205 // found the caller
206 caller = vfst.method()->method_holder();
207 line_number = vfst.method()->line_number_from_bci(vfst.bci());
208 if (line_number == -1) {
209 // show method name if it's a native method
210 trace = vfst.method()->name_and_sig_as_C_string();
211 }
212 Symbol* s = caller->source_file_name();
213 if (s != nullptr) {
214 source_file = s->as_C_string();
215 }
216 }
217 }
218 if (caller != nullptr) {
219 if (to_class != caller) {
220 const char * from = caller->external_name();
221 const char * to = to_class->external_name();
222 // print in a single call to reduce interleaving between threads
223 if (source_file != nullptr) {
224 log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
225 } else {
226 log_debug(class, resolve)("%s %s (%s)", from, to, trace);
227 }
228 }
229 }
230 }
231
232 // java.lang.System //////////////////////////////////////////////////////////////////////
233
234 JVM_ENTRY(jboolean, JVM_AOTEndRecording(JNIEnv *env))
235 #if INCLUDE_CDS
236 if (CDSConfig::is_dumping_preimage_static_archive()) {
237 if (!AOTMetaspace::preimage_static_archive_dumped()) {
238 AOTMetaspace::dump_static_archive(THREAD);
239 return JNI_TRUE;
240 }
241 }
242 return JNI_FALSE;
243 #else
244 return JNI_FALSE;
245 #endif // INCLUDE_CDS
246 JVM_END
247
248 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
249 return os::javaTimeMillis();
250 JVM_END
251
252 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
253 return os::javaTimeNanos();
254 JVM_END
255
256 // The function below is actually exposed by jdk.internal.misc.VM and not
257 // java.lang.System, but we choose to keep it here so that it stays next
258 // to JVM_CurrentTimeMillis and JVM_NanoTime
259
260 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); // 2^32
261 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
262
263 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
264 jlong seconds;
265 jlong nanos;
266
267 os::javaTimeSystemUTC(seconds, nanos);
268
269 // We're going to verify that the result can fit in a long.
270 // For that we need the difference in seconds between 'seconds'
271 // and 'offset_secs' to be such that:
272 // |seconds - offset_secs| < (2^63/10^9)
273 // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
274 // which makes |seconds - offset_secs| < 2^33
275 // and we will prefer +/- 2^32 as the maximum acceptable diff
276 // as 2^32 has a more natural feel than 2^33...
277 //
278 // So if |seconds - offset_secs| >= 2^32 - we return a special
279 // sentinel value (-1) which the caller should take as an
280 // exception value indicating that the offset given to us is
281 // too far from range of the current time - leading to too big
282 // a nano adjustment. The caller is expected to recover by
283 // computing a more accurate offset and calling this method
284 // again. (For the record 2^32 secs is ~136 years, so that
285 // should rarely happen)
286 //
287 jlong diff = seconds - offset_secs;
288 if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
289 return -1; // sentinel value: the offset is too far off the target
290 }
291
292 // return the adjustment. If you compute a time by adding
293 // this number of nanoseconds along with the number of seconds
294 // in the offset you should get the current UTC time.
295 return (diff * (jlong)1000000000) + nanos;
296 JVM_END
297
298 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
299 jobject dst, jint dst_pos, jint length))
300 // Check if we have null pointers
301 if (src == nullptr || dst == nullptr) {
302 THROW(vmSymbols::java_lang_NullPointerException());
303 }
304 arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
305 arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
306 assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
307 assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
308 // Do copy
309 s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
310 JVM_END
311
312
313 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
314 JavaValue r(T_OBJECT);
315 // public synchronized Object put(Object key, Object value);
316 HandleMark hm(THREAD);
317 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK);
318 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
319 JavaCalls::call_virtual(&r,
320 props,
321 vmClasses::Properties_klass(),
322 vmSymbols::put_name(),
323 vmSymbols::object_object_object_signature(),
324 key_str,
325 value_str,
326 THREAD);
327 }
328
329
330 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
331
332 /*
333 * Return all of the system properties in a Java String array with alternating
334 * names and values from the jvm SystemProperty.
335 * Which includes some internal and all commandline -D defined properties.
336 */
337 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
338 ResourceMark rm(THREAD);
339 HandleMark hm(THREAD);
340 int ndx = 0;
341 int fixedCount = 2;
342
343 SystemProperty* p = Arguments::system_properties();
344 int count = Arguments::PropertyList_count(p);
345
346 // Allocate result String array
347 InstanceKlass* ik = vmClasses::String_klass();
348 objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
349 objArrayHandle result_h(THREAD, r);
350
351 while (p != nullptr) {
352 const char * key = p->key();
353 if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
354 const char * value = p->value();
355 Handle key_str = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
356 Handle value_str = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
357 result_h->obj_at_put(ndx * 2, key_str());
358 result_h->obj_at_put(ndx * 2 + 1, value_str());
359 ndx++;
360 }
361 p = p->next();
362 }
363
364 // Convert the -XX:MaxDirectMemorySize= command line flag
365 // to the sun.nio.MaxDirectMemorySize property.
366 // Do this after setting user properties to prevent people
367 // from setting the value with a -D option, as requested.
368 // Leave empty if not supplied
369 if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
370 char as_chars[256];
371 jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
372 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
373 Handle value_str = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
374 result_h->obj_at_put(ndx * 2, key_str());
375 result_h->obj_at_put(ndx * 2 + 1, value_str());
376 ndx++;
377 }
378
379 // JVM monitoring and management support
380 // Add the sun.management.compiler property for the compiler's name
381 {
382 #undef CSIZE
383 #if defined(_LP64)
384 #define CSIZE "64-Bit "
385 #else
386 #define CSIZE
387 #endif // 64bit
388
389 #if COMPILER1_AND_COMPILER2
390 const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
391 #else
392 #if defined(COMPILER1)
393 const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
394 #elif defined(COMPILER2)
395 const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
396 #else
397 const char* compiler_name = "";
398 #endif // compilers
399 #endif // COMPILER1_AND_COMPILER2
400
401 if (*compiler_name != '\0' &&
402 (Arguments::mode() != Arguments::_int)) {
403 Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
404 Handle value_str = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
405 result_h->obj_at_put(ndx * 2, key_str());
406 result_h->obj_at_put(ndx * 2 + 1, value_str());
407 ndx++;
408 }
409 }
410
411 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
412 JVM_END
413
414
415 /*
416 * Return the temporary directory that the VM uses for the attach
417 * and perf data files.
418 *
419 * It is important that this directory is well-known and the
420 * same for all VM instances. It cannot be affected by configuration
421 * variables such as java.io.tmpdir.
422 */
423 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
424 HandleMark hm(THREAD);
425 const char* temp_dir = os::get_temp_directory();
426 Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
427 return (jstring) JNIHandles::make_local(THREAD, h());
428 JVM_END
429
430 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
431 oop o = JNIHandles::resolve_non_null(orig);
432 assert(o->is_array(), "Must be");
433 objArrayOop dest = nullptr;
434 arrayOop org = (arrayOop)o;
435 arrayHandle oh(THREAD, org);
436 ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass());
437 int len = to - from; // length of the new array
438 assert(len >= 0, "Java caller checks that from <= to");
439 int orig_length = org->length();
440 if (ak->is_null_free_array_klass()) {
441 if ((len != 0) && (from >= orig_length || to > orig_length)) {
442 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
443 }
444 }
445
446 if (ak->is_flatArray_klass()) {
447 FlatArrayKlass* const fak = FlatArrayKlass::cast(org->klass());
448 dest = fak->allocate_instance(len, CHECK_NULL);
449 } else {
450 const ArrayProperties props = ArrayProperties::Default().with_null_restricted(ak->is_null_free_array_klass());
451 InlineKlass* vk = InlineKlass::cast(ak->element_klass());
452 dest = oopFactory::new_objArray(vk, len, props, CHECK_NULL);
453 }
454
455 objArrayHandle dh(THREAD, dest);
456
457 int copy_len = MIN2(to, orig_length) - MIN2(from, orig_length);
458 if (copy_len != 0) {
459 assert(!ak->is_null_free_array_klass() || copy_len == len,
460 "Failed to throw the IllegalArgumentException");
461 ak->copy_array(oh(), from, dh(), 0, copy_len, CHECK_NULL);
462 // Null out values past the length of the copy
463 for (int i = copy_len; i < len; i++) {
464 dh()->obj_at_put(i, nullptr);
465 }
466 } else {
467 for (int i = 0; i < len; i++) {
468 assert(!dh()->is_null_free_array(), "Should have thrown an IAE above");
469 dh()->obj_at_put(i, nullptr);
470 }
471 }
472
473 return (jarray) JNIHandles::make_local(THREAD, dh());
474
475 JVM_END
476
477 #ifdef ASSERT
478 static void verify_array_arguments(jclass elmClass, jint len) {
479 assert(len >= 0, "Negative array length");
480 assert(elmClass != nullptr, "Null element class");
481 oop mirror = JNIHandles::resolve_non_null(elmClass);
482 Klass* klass = java_lang_Class::as_Klass(mirror);
483 assert(klass->is_inline_klass(), "Element class must be an inline class");
484 }
485 #endif // ASSERT
486
487 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
488 DEBUG_ONLY(verify_array_arguments(elmClass, len));
489 oop mirror = JNIHandles::resolve_non_null(elmClass);
490 Klass* klass = java_lang_Class::as_Klass(mirror);
491 oop init = JNIHandles::resolve_non_null(initVal);
492 Handle init_h(THREAD, init);
493 assert(klass == init_h()->klass(), "Type mismatch between array and initial value");
494 const ArrayProperties props = ArrayProperties::Default()
495 .with_null_restricted()
496 .with_non_atomic();
497 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
498 for (int i = 0; i < len; i++) {
499 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
500 }
501 return (jarray) JNIHandles::make_local(THREAD, array);
502 JVM_END
503
504 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
505 DEBUG_ONLY(verify_array_arguments(elmClass, len);)
506 oop mirror = JNIHandles::resolve_non_null(elmClass);
507 Klass* klass = java_lang_Class::as_Klass(mirror);
508 oop init = JNIHandles::resolve_non_null(initVal);
509 Handle init_h(THREAD, init);
510 assert(klass == init_h()->klass(), "Type mismatch between array and initial value");
511 const ArrayProperties props = ArrayProperties::Default().with_null_restricted();
512 objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
513 for (int i = 0; i < len; i++) {
514 array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
515 }
516 return (jarray) JNIHandles::make_local(THREAD, array);
517 JVM_END
518
519 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
520 DEBUG_ONLY(verify_array_arguments(elmClass, len);)
521 oop mirror = JNIHandles::resolve_non_null(elmClass);
522 Klass* klass = java_lang_Class::as_Klass(mirror);
523 objArrayOop array = oopFactory::new_objArray(klass, len, ArrayProperties::Default(), CHECK_NULL);
524 return (jarray) JNIHandles::make_local(THREAD, array);
525 JVM_END
526
527 JVM_ENTRY(jarray, JVM_NewReferenceArray(JNIEnv *env, jclass elmClass, jint len))
528 DEBUG_ONLY(verify_array_arguments(elmClass, len);)
529 oop mirror = JNIHandles::resolve_non_null(elmClass);
530 Klass* klass = java_lang_Class::as_Klass(mirror);
531 refArrayOop array = oopFactory::new_refArray(klass, len, ArrayProperties::Default(), CHECK_NULL);
532 return (jarray) JNIHandles::make_local(THREAD, array);
533 JVM_END
534
535 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jarray array))
536 oop o = JNIHandles::resolve_non_null(array);
537 Klass* klass = o->klass();
538
539 assert(klass->is_objArray_klass(), "Expects an object array");
540
541 return klass->is_flatArray_klass();
542 JVM_END
543
544 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jarray array))
545 oop o = JNIHandles::resolve_non_null(array);
546 Klass* klass = o->klass();
547
548 assert(klass->is_objArray_klass(), "Expects an object array");
549
550 return klass->is_null_free_array_klass();
551 JVM_END
552
553 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jarray array))
554 // There are multiple cases where an array can/must support atomic access:
555 // - the array is a reference array
556 // - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or NULL_FREE_ATOMIC_FLAT
557 // - the array is flat and its component type is naturally atomic
558 oop o = JNIHandles::resolve_non_null(array);
559 Klass* klass = o->klass();
560
561 assert(klass->is_objArray_klass(), "Expects an object array");
562
563 if (klass->is_refArray_klass()) {
564 return true;
565 }
566
567 if (klass->is_flatArray_klass()) {
568 FlatArrayKlass* fak = FlatArrayKlass::cast(klass);
569 if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) {
570 return true;
571 }
572 bool is_null_free = !LayoutKindHelper::is_nullable_flat(fak->layout_kind());
573 if (fak->element_klass()->is_naturally_atomic(is_null_free)) {
574 return true;
575 }
576
577 return false;
578 }
579
580 ShouldNotReachHere();
581 JVM_END
582
583 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
584
585 extern volatile jint vm_created;
586
587 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
588 EventShutdown event;
589 if (event.should_commit()) {
590 event.set_reason("Shutdown requested from Java");
591 event.commit();
592 }
593 JVM_END
594
595
596 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
597 before_exit(thread, true);
598 vm_exit(code);
599 JVM_END
600
601
602 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
603 if (!DisableExplicitGC) {
604 EventSystemGC event;
605 event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
606 Universe::heap()->collect(GCCause::_java_lang_system_gc);
607 event.commit();
608 }
609 JVM_END
610
611
612 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
613 return Universe::heap()->millis_since_last_whole_heap_examined();
614 JVM_END
615
616
617 static inline jlong convert_size_t_to_jlong(size_t val) {
618 // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
619 NOT_LP64 (return (jlong)val;)
620 LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
621 }
622
623 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
624 size_t n = Universe::heap()->capacity();
625 return convert_size_t_to_jlong(n);
626 JVM_END
627
628
629 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
630 size_t n = Universe::heap()->unused();
631 return convert_size_t_to_jlong(n);
632 JVM_END
633
634
635 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
636 size_t n = Universe::heap()->max_capacity();
637 return convert_size_t_to_jlong(n);
638 JVM_END
639
640
641 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
642 return os::active_processor_count();
643 JVM_END
644
645 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
646 #ifdef LINUX
647 if (UseContainerSupport) {
648 return JNI_TRUE;
649 }
650 #endif
651 return JNI_FALSE;
652 JVM_END
653
654 JVM_LEAF(jboolean, JVM_IsContainerized(void))
655 if (os::is_containerized()) {
656 return JNI_TRUE;
657 }
658 return JNI_FALSE;
659 JVM_END
660
661 // java.lang.Throwable //////////////////////////////////////////////////////
662
663 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
664 Handle exception(thread, JNIHandles::resolve_non_null(receiver));
665 java_lang_Throwable::fill_in_stack_trace(exception);
666 JVM_END
667
668 // java.lang.NullPointerException ///////////////////////////////////////////
669
670 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
671 if (!ShowCodeDetailsInExceptionMessages) return nullptr;
672
673 oop exc = JNIHandles::resolve_non_null(throwable);
674
675 Method* method;
676 int bci;
677 if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
678 return nullptr;
679 }
680 if (method->is_native()) {
681 return nullptr;
682 }
683
684 stringStream ss;
685 bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
686 if (ok) {
687 oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
688 return (jstring) JNIHandles::make_local(THREAD, result);
689 } else {
690 return nullptr;
691 }
692 JVM_END
693
694 // java.lang.StackTraceElement //////////////////////////////////////////////
695
696
697 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
698 Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
699 refArrayOop st = refArrayOop(JNIHandles::resolve(elements));
700 refArrayHandle stack_trace(THREAD, st);
701 // Fill in the allocated stack trace
702 java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
703 JVM_END
704
705
706 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
707 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
708 Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
709 java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
710 JVM_END
711
712
713 // java.lang.StackWalker //////////////////////////////////////////////////////
714 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
715 Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
716
717 bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
718 bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
719 Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
720 if (!have_name) {
721 oop name = StringTable::intern(method->name(), CHECK);
722 java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
723 }
724 if (!have_type) {
725 Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
726 java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
727 }
728 JVM_END
729
730 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
731 jint skip_frames, jobject contScope, jobject cont,
732 jint buffer_size, jint start_index, jobjectArray frames))
733 if (!thread->has_last_Java_frame()) {
734 THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
735 }
736
737 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
738 Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
739 Handle cont_h(THREAD, JNIHandles::resolve(cont));
740 // frames array is a ClassFrameInfo[] array when only getting caller reference,
741 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
742 // be null.
743 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames));
744 refArrayHandle frames_array_h(THREAD, fa);
745
746 if (frames_array_h->length() < buffer_size) {
747 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
748 }
749
750 oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
751 buffer_size, start_index, frames_array_h, CHECK_NULL);
752 return JNIHandles::make_local(THREAD, result);
753 JVM_END
754
755
756 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
757 jint last_batch_count, jint buffer_size, jint start_index,
758 jobjectArray frames))
759 // frames array is a ClassFrameInfo[] array when only getting caller reference,
760 // and a StackFrameInfo[] array (or derivative) otherwise. It should never
761 // be null.
762 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames));
763 refArrayHandle frames_array_h(THREAD, fa);
764
765 if (frames_array_h->length() < buffer_size) {
766 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
767 }
768
769 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
770 return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
771 start_index, frames_array_h, THREAD);
772 JVM_END
773
774 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
775 refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames));
776 refArrayHandle frames_array_h(THREAD, fa);
777 Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
778 Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
779
780 StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
781 JVM_END
782
783 // java.lang.Object ///////////////////////////////////////////////
784
785
786 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
787 // as implemented in the classic virtual machine; return 0 if object is null
788 if (handle == nullptr) {
789 return 0;
790 }
791 oop obj = JNIHandles::resolve_non_null(handle);
792 if (Arguments::is_valhalla_enabled() && obj->klass()->is_inline_klass()) {
793 const intptr_t obj_identity_hash = obj->mark().hash();
794 // Check if mark word contains hash code already.
795 // It is possible that the generated identity hash is 0, which is not
796 // distinct from the no_hash value. In such a case, the hash will be
797 // computed and set every time JVM_IHashCode is called. If that happens,
798 // the only consequence is losing out on the optimization.
799 if (obj_identity_hash != markWord::no_hash) {
800 return checked_cast<jint>(obj_identity_hash);
801 }
802
803 // Compute hash by calling ValueObjectMethods.valueObjectHashCode.
804 // The identity hash is invariantly immutable (see its JavaDoc comment).
805 JavaValue result(T_INT);
806 JavaCallArguments args;
807 Handle ho(THREAD, obj);
808 args.push_oop(ho);
809 methodHandle method(THREAD, Universe::value_object_hash_code_method());
810 JavaCalls::call(&result, method, &args, THREAD);
811 Exceptions::wrap_exception_in_internal_error("Internal error in hashCode", CHECK_0);
812
813 const intptr_t identity_hash = result.get_jint();
814
815 // We now have to set the hash via CAS. It's possible that this will race
816 // other threads. By our invariant of immutability, when there is a
817 // race, the identity hash code is going to be one of the following:
818 // a) 0, another thread updated other markWord bits; b) identity_hash set
819 // by another thread; or c) identity_hash set by the current thread.
820 // A nonzero identity hash code that is not the identity_hash computed
821 // earlier indicates a violation of the invariant.
822 markWord current_mark, old_mark, new_mark;
823 do {
824 current_mark = ho->mark();
825 new_mark = current_mark.copy_set_hash(identity_hash);
826 old_mark = ho->cas_set_mark(new_mark, current_mark);
827 assert(old_mark.has_no_hash() || old_mark.hash() == new_mark.hash(),
828 "CAS identity hash invariant violated, expected=" INTPTR_FORMAT " actual=" INTPTR_FORMAT,
829 new_mark.hash(),
830 old_mark.hash());
831 } while (old_mark != current_mark);
832
833 return checked_cast<jint>(new_mark.hash());
834 } else {
835 return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
836 }
837 JVM_END
838
839
840 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
841 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
842 ObjectSynchronizer::wait(obj, ms, CHECK);
843 JVM_END
844
845
846 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
847 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
848 ObjectSynchronizer::notify(obj, CHECK);
849 JVM_END
850
851
852 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
853 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
854 ObjectSynchronizer::notifyall(obj, CHECK);
855 JVM_END
856
857
858 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
859 Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
860 Klass* klass = obj->klass();
861 JvmtiVMObjectAllocEventCollector oam;
862
863 #ifdef ASSERT
864 // Just checking that the cloneable flag is set correct
865 if (obj->is_array()) {
866 guarantee(klass->is_cloneable(), "all arrays are cloneable");
867 } else {
868 guarantee(obj->is_instance(), "should be instanceOop");
869 bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
870 guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
871 }
872 #endif
873
874 // Check if class of obj supports the Cloneable interface.
875 // All arrays are considered to be cloneable (See JLS 20.1.5).
876 // All j.l.r.Reference classes are considered non-cloneable.
877 if (!klass->is_cloneable() ||
878 (klass->is_instance_klass() &&
879 InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
880 ResourceMark rm(THREAD);
881 THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
882 }
883
884 if (klass->is_inline_klass()) {
885 // Value instances have no identity, so return the current instance instead of allocating a new one
886 // Value classes cannot have finalizers, so the method can return immediately
887 return JNIHandles::make_local(THREAD, obj());
888 }
889
890 // Make shallow object copy
891 const size_t size = obj->size();
892 oop new_obj_oop = nullptr;
893 if (obj->is_array()) {
894 const int length = ((arrayOop)obj())->length();
895 new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
896 /* do_zero */ true, CHECK_NULL);
897 } else {
898 new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
899 }
900
901 HeapAccess<>::clone(obj(), new_obj_oop, size);
902
903 Handle new_obj(THREAD, new_obj_oop);
904 // Caution: this involves a java upcall, so the clone should be
905 // "gc-robust" by this stage.
906 if (klass->has_finalizer()) {
907 assert(obj->is_instance(), "should be instanceOop");
908 new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
909 new_obj = Handle(THREAD, new_obj_oop);
910 }
911
912 return JNIHandles::make_local(THREAD, new_obj());
913 JVM_END
914
915 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
916
917 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
918 MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
919 JVM_END
920
921 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
922 return InstanceKlass::is_finalization_enabled();
923 JVM_END
924
925 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
926
927 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
928 CONT_RegisterNativeMethods(env, cls);
929 JVM_END
930
931 // java.io.File ///////////////////////////////////////////////////////////////
932
933 JVM_LEAF(char*, JVM_NativePath(char* path))
934 return os::native_path(path);
935 JVM_END
936
937
938 // Misc. class handling ///////////////////////////////////////////////////////////
939
940
941 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
942 // Getting the class of the caller frame.
943 //
944 // The call stack at this point looks something like this:
945 //
946 // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
947 // [1] [ @CallerSensitive API.method ]
948 // [.] [ (skipped intermediate frames) ]
949 // [n] [ caller ]
950 vframeStream vfst(thread);
951 // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
952 for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
953 Method* m = vfst.method();
954 assert(m != nullptr, "sanity");
955 switch (n) {
956 case 0:
957 // This must only be called from Reflection.getCallerClass
958 if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
959 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
960 }
961 // fall-through
962 case 1:
963 // Frame 0 and 1 must be caller sensitive.
964 if (!m->caller_sensitive()) {
965 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
966 }
967 break;
968 default:
969 if (!m->is_ignored_by_security_stack_walk()) {
970 // We have reached the desired frame; return the holder class.
971 return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
972 }
973 break;
974 }
975 }
976 return nullptr;
977 JVM_END
978
979
980 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
981 oop mirror = nullptr;
982 BasicType t = name2type(utf);
983 if (t != T_ILLEGAL && !is_reference_type(t)) {
984 mirror = Universe::java_mirror(t);
985 }
986 if (mirror == nullptr) {
987 THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
988 } else {
989 return (jclass) JNIHandles::make_local(THREAD, mirror);
990 }
991 JVM_END
992
993
994 // Returns a class loaded by the bootstrap class loader; or null
995 // if not found. ClassNotFoundException is not thrown.
996 // FindClassFromBootLoader is exported to the launcher for windows.
997 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
998 const char* name))
999 // Java libraries should ensure that name is never null or illegal.
1000 if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
1001 // It's impossible to create this class; the name cannot fit
1002 // into the constant pool.
1003 return nullptr;
1004 }
1005 assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
1006
1007 TempNewSymbol h_name = SymbolTable::new_symbol(name);
1008 Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
1009 if (k == nullptr) {
1010 return nullptr;
1011 }
1012
1013 if (log_is_enabled(Debug, class, resolve)) {
1014 trace_class_resolution(k);
1015 }
1016 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1017 JVM_END
1018
1019 // Find a class with this name in this loader.
1020 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
1021 jboolean init, jobject loader))
1022 TempNewSymbol h_name =
1023 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1024 CHECK_NULL);
1025
1026 oop loader_oop = JNIHandles::resolve(loader);
1027 Handle h_loader(THREAD, loader_oop);
1028
1029 jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1030 false, THREAD);
1031
1032 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1033 trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1034 }
1035 return result;
1036 JVM_END
1037
1038 // Currently only called from the old verifier.
1039 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1040 jboolean init, jclass from))
1041 TempNewSymbol h_name =
1042 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1043 CHECK_NULL);
1044 oop from_class_oop = JNIHandles::resolve(from);
1045 assert(from_class_oop != nullptr, "must be");
1046 Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
1047 assert(from_class != nullptr, "must be");
1048 oop class_loader = from_class->class_loader();
1049
1050 Handle h_loader(THREAD, class_loader);
1051 jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1052
1053 if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1054 // this function is generally only used for class loading during verification.
1055 ResourceMark rm;
1056 const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1057 const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1058 log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1059 }
1060
1061 #if INCLUDE_CDS
1062 if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1063 InstanceKlass* ik = InstanceKlass::cast(from_class);
1064 SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1065 }
1066 #endif
1067
1068 return result;
1069 JVM_END
1070
1071 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1072 static jclass jvm_define_class_common(const char *name,
1073 jobject loader, const jbyte *buf,
1074 jsize len, jobject pd, const char *source,
1075 TRAPS) {
1076 if (source == nullptr) source = "__JVM_DefineClass__";
1077
1078 JavaThread* jt = THREAD;
1079
1080 PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1081 ClassLoader::perf_define_appclass_selftime(),
1082 ClassLoader::perf_define_appclasses(),
1083 jt->get_thread_stat()->perf_recursion_counts_addr(),
1084 jt->get_thread_stat()->perf_timers_addr(),
1085 PerfClassTraceTime::DEFINE_CLASS);
1086
1087 if (UsePerfData) {
1088 ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1089 }
1090
1091 // Class resolution will get the class name from the .class stream if the name is null.
1092 TempNewSymbol class_name = name == nullptr ? nullptr :
1093 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1094 CHECK_NULL);
1095
1096 ResourceMark rm(THREAD);
1097 ClassFileStream st((u1*)buf, len, source);
1098 Handle class_loader (THREAD, JNIHandles::resolve(loader));
1099 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1100 ClassLoadInfo cl_info(protection_domain);
1101 Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1102 class_loader,
1103 cl_info,
1104 CHECK_NULL);
1105
1106 if (log_is_enabled(Debug, class, resolve)) {
1107 trace_class_resolution(k);
1108 }
1109
1110 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1111 }
1112
1113 enum {
1114 NESTMATE = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1115 HIDDEN_CLASS = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1116 STRONG_LOADER_LINK = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1117 ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1118 };
1119
1120 /*
1121 * Define a class with the specified flags that indicates if it's a nestmate,
1122 * hidden, or strongly referenced from class loader.
1123 */
1124 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1125 const jbyte *buf, jsize len, jobject pd,
1126 jboolean init, int flags, jobject classData, TRAPS) {
1127 ResourceMark rm(THREAD);
1128
1129 InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1130 // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1131 if (lookup_k == nullptr) {
1132 // The error message is wrong. We come here only if lookup is a primitive class
1133 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1134 }
1135
1136 Handle class_loader (THREAD, lookup_k->class_loader());
1137
1138 bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1139 bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1140 bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1141 bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1142
1143 InstanceKlass* host_class = nullptr;
1144 if (is_nestmate) {
1145 host_class = lookup_k->nest_host(CHECK_NULL);
1146 }
1147
1148 log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1149 name,
1150 is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1151 is_nestmate ? host_class->external_name() : "",
1152 is_hidden ? "hidden" : "not hidden",
1153 is_strong ? "strong" : "weak",
1154 vm_annotations ? "with vm annotations" : "without vm annotation");
1155
1156 if (!is_hidden) {
1157 // classData is only applicable for hidden classes
1158 if (classData != nullptr) {
1159 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1160 }
1161 if (is_nestmate) {
1162 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1163 }
1164 if (!is_strong) {
1165 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1166 }
1167 if (vm_annotations) {
1168 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1169 }
1170 if (flags != STRONG_LOADER_LINK) {
1171 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1172 err_msg("invalid flag 0x%x", flags));
1173 }
1174 }
1175
1176 // Class resolution will get the class name from the .class stream if the name is null.
1177 TempNewSymbol class_name = name == nullptr ? nullptr :
1178 SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1179 CHECK_NULL);
1180
1181 Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1182 const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1183 ClassFileStream st((u1*)buf, len, source);
1184
1185 InstanceKlass* ik = nullptr;
1186 if (!is_hidden) {
1187 ClassLoadInfo cl_info(protection_domain);
1188 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1189 class_loader,
1190 cl_info,
1191 CHECK_NULL);
1192
1193 if (log_is_enabled(Debug, class, resolve)) {
1194 trace_class_resolution(ik);
1195 }
1196 } else { // hidden
1197 Handle classData_h(THREAD, JNIHandles::resolve(classData));
1198 ClassLoadInfo cl_info(protection_domain,
1199 host_class,
1200 classData_h,
1201 is_hidden,
1202 is_strong,
1203 vm_annotations);
1204 ik = SystemDictionary::resolve_from_stream(&st, class_name,
1205 class_loader,
1206 cl_info,
1207 CHECK_NULL);
1208
1209 // The hidden class loader data has been artificially been kept alive to
1210 // this point. The mirror and any instances of this class have to keep
1211 // it alive afterwards.
1212 ik->class_loader_data()->dec_keep_alive_ref_count();
1213
1214 if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1215 ModuleEntry* module = ik->module();
1216 const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1217 log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1218 module_name,
1219 ik->external_name(),
1220 host_class->external_name(),
1221 ik->is_hidden() ? "is hidden" : "is not hidden");
1222 }
1223 }
1224
1225 if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1226 // non-hidden class or nestmate class must be in the same package as the Lookup class
1227 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1228 }
1229
1230 if (init) {
1231 ik->initialize(CHECK_NULL);
1232 } else {
1233 ik->link_class(CHECK_NULL);
1234 }
1235
1236 return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1237 }
1238
1239 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1240 return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1241 JVM_END
1242
1243 /*
1244 * Define a class with the specified lookup class.
1245 * lookup: Lookup class
1246 * name: the name of the class
1247 * buf: class bytes
1248 * len: length of class bytes
1249 * pd: protection domain
1250 * init: initialize the class
1251 * flags: properties of the class
1252 * classData: private static pre-initialized field
1253 */
1254 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1255 jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1256
1257 if (lookup == nullptr) {
1258 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1259 }
1260
1261 assert(buf != nullptr, "buf must not be null");
1262
1263 return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1264 JVM_END
1265
1266 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1267
1268 return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1269 JVM_END
1270
1271 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1272 ResourceMark rm(THREAD);
1273
1274 Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1275 char* str = java_lang_String::as_utf8_string(h_name());
1276
1277 // Sanity check, don't expect null
1278 if (str == nullptr) return nullptr;
1279
1280 // Internalize the string, converting '.' to '/' in string.
1281 char* p = (char*)str;
1282 while (*p != '\0') {
1283 if (*p == '.') {
1284 *p = '/';
1285 }
1286 p++;
1287 }
1288
1289 const int str_len = (int)(p - str);
1290 if (str_len > Symbol::max_length()) {
1291 // It's impossible to create this class; the name cannot fit
1292 // into the constant pool.
1293 return nullptr;
1294 }
1295 TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1296
1297 // Security Note:
1298 // The Java level wrapper will perform the necessary security check allowing
1299 // us to pass the null as the initiating class loader.
1300 Handle h_loader(THREAD, JNIHandles::resolve(loader));
1301 Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1302 #if INCLUDE_CDS
1303 if (k == nullptr) {
1304 // If the class is not already loaded, try to see if it's in the shared
1305 // archive for the current classloader (h_loader).
1306 k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1307 }
1308 #endif
1309 return (k == nullptr) ? nullptr :
1310 (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1311 JVM_END
1312
1313 // Module support //////////////////////////////////////////////////////////////////////////////
1314
1315 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1316 jstring location, jobjectArray packages))
1317 Handle h_module (THREAD, JNIHandles::resolve(module));
1318 Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1319 JVM_END
1320
1321 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1322 Handle h_module (THREAD, JNIHandles::resolve(module));
1323 Modules::set_bootloader_unnamed_module(h_module, CHECK);
1324 JVM_END
1325
1326 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1327 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1328 Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1329 Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1330 JVM_END
1331
1332 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1333 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1334 Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1335 JVM_END
1336
1337 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1338 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1339 Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1340 JVM_END
1341
1342 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1343 Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1344 Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1345 Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1346 JVM_END
1347
1348 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1349 Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1350 Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1351 Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1352 JVM_END
1353
1354 // Reflection support //////////////////////////////////////////////////////////////////////////////
1355
1356 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1357 assert (cls != nullptr, "illegal class");
1358 JvmtiVMObjectAllocEventCollector oam;
1359 ResourceMark rm(THREAD);
1360 HandleMark hm(THREAD);
1361 Handle java_class(THREAD, JNIHandles::resolve(cls));
1362 oop result = java_lang_Class::name(java_class, CHECK_NULL);
1363 return (jstring) JNIHandles::make_local(THREAD, result);
1364 JVM_END
1365
1366
1367 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1368 JvmtiVMObjectAllocEventCollector oam;
1369 oop mirror = JNIHandles::resolve_non_null(cls);
1370
1371 // Special handling for primitive objects
1372 if (java_lang_Class::is_primitive(mirror)) {
1373 // Primitive objects does not have any interfaces
1374 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1375 return (jobjectArray) JNIHandles::make_local(THREAD, r);
1376 }
1377
1378 Klass* klass = java_lang_Class::as_Klass(mirror);
1379 // Figure size of result array
1380 int size;
1381 if (klass->is_instance_klass()) {
1382 InstanceKlass* ik = InstanceKlass::cast(klass);
1383 size = ik->local_interfaces()->length();
1384 } else {
1385 assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1386 size = 2;
1387 }
1388
1389 // Allocate result array
1390 objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1391 objArrayHandle result (THREAD, r);
1392 // Fill in result
1393 if (klass->is_instance_klass()) {
1394 // Regular instance klass, fill in all local interfaces
1395 for (int index = 0; index < size; index++) {
1396 InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1397 result->obj_at_put(index, k->java_mirror());
1398 }
1399 } else {
1400 // All arrays implement java.lang.Cloneable and java.io.Serializable
1401 result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1402 result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1403 }
1404 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1405 JVM_END
1406
1407
1408 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1409 oop mirror = JNIHandles::resolve_non_null(cls);
1410 if (java_lang_Class::is_primitive(mirror)) {
1411 return JNI_FALSE;
1412 }
1413 Klass* k = java_lang_Class::as_Klass(mirror);
1414 return k->is_hidden();
1415 JVM_END
1416
1417
1418 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1419 ResourceMark rm(THREAD);
1420 GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1421 JvmtiVMObjectAllocEventCollector oam;
1422
1423 // Iterate through Java frames
1424 vframeStream vfst(thread);
1425 for(; !vfst.at_end(); vfst.next()) {
1426 int loc = -1;
1427 // get method of frame
1428 Method* method = vfst.method();
1429
1430 Symbol *name = method->name();
1431
1432 InstanceKlass* holder = method->method_holder();
1433 if (name == vmSymbols::runWith_method_name()) {
1434 if (holder == vmClasses::Thread_klass()
1435 || holder == vmClasses::ScopedValue_Carrier_klass()) {
1436 loc = 1;
1437 }
1438 }
1439
1440 if (loc != -1) {
1441 javaVFrame *frame = vfst.asJavaVFrame();
1442 StackValueCollection* locals = frame->locals();
1443 StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1444 Handle result = head_sv->get_obj();
1445 assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1446 if (result() != nullptr) {
1447 return JNIHandles::make_local(THREAD, result());
1448 }
1449 }
1450 }
1451
1452 return nullptr;
1453 JVM_END
1454
1455 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1456 JvmtiVMObjectAllocEventCollector oam;
1457 // ofClass is a reference to a java_lang_Class object. The mirror object
1458 // of an InstanceKlass
1459 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1460 if (java_lang_Class::is_primitive(ofMirror) ||
1461 ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1462 oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1463 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1464 }
1465
1466 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1467 InnerClassesIterator iter(k);
1468
1469 if (iter.length() == 0) {
1470 // Neither an inner nor outer class
1471 oop result = oopFactory::new_refArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1472 return (jobjectArray)JNIHandles::make_local(THREAD, result);
1473 }
1474
1475 // find inner class info
1476 constantPoolHandle cp(thread, k->constants());
1477 int length = iter.length();
1478
1479 // Allocate temp. result array
1480 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length / 4, CHECK_NULL);
1481 refArrayHandle result(THREAD, r);
1482 int members = 0;
1483
1484 for (; !iter.done(); iter.next()) {
1485 int ioff = iter.inner_class_info_index();
1486 int ooff = iter.outer_class_info_index();
1487
1488 if (ioff != 0 && ooff != 0) {
1489 // Check to see if the name matches the class we're looking for
1490 // before attempting to find the class.
1491 if (cp->klass_name_at_matches(k, ooff)) {
1492 Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1493 if (outer_klass == k) {
1494 Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1495 InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1496
1497 // Throws an exception if outer klass has not declared k as
1498 // an inner klass
1499 Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1500
1501 result->obj_at_put(members, inner_klass->java_mirror());
1502 members++;
1503 }
1504 }
1505 }
1506 }
1507
1508 if (members != length) {
1509 // Return array of right length
1510 refArrayOop res = oopFactory::new_refArray(vmClasses::Class_klass(), members, CHECK_NULL);
1511 for(int i = 0; i < members; i++) {
1512 res->obj_at_put(i, result->obj_at(i));
1513 }
1514 return (jobjectArray)JNIHandles::make_local(THREAD, res);
1515 }
1516
1517 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1518 JVM_END
1519
1520
1521 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1522 {
1523 // ofClass is a reference to a java_lang_Class object.
1524 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1525 if (java_lang_Class::is_primitive(ofMirror)) {
1526 return nullptr;
1527 }
1528 Klass* klass = java_lang_Class::as_Klass(ofMirror);
1529 if (!klass->is_instance_klass()) {
1530 return nullptr;
1531 }
1532
1533 bool inner_is_member = false;
1534 Klass* outer_klass
1535 = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1536 if (outer_klass == nullptr) return nullptr; // already a top-level class
1537 if (!inner_is_member) return nullptr; // a hidden class (inside a method)
1538 return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1539 }
1540 JVM_END
1541
1542 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1543 {
1544 oop mirror = JNIHandles::resolve_non_null(cls);
1545 if (java_lang_Class::is_primitive(mirror)) {
1546 return nullptr;
1547 }
1548 Klass* klass = java_lang_Class::as_Klass(mirror);
1549 if (!klass->is_instance_klass()) {
1550 return nullptr;
1551 }
1552 InstanceKlass* k = InstanceKlass::cast(klass);
1553 int ooff = 0, noff = 0;
1554 if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1555 if (noff != 0) {
1556 constantPoolHandle i_cp(thread, k->constants());
1557 Symbol* name = i_cp->symbol_at(noff);
1558 Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1559 return (jstring) JNIHandles::make_local(THREAD, str());
1560 }
1561 }
1562 return nullptr;
1563 }
1564 JVM_END
1565
1566 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1567 assert (cls != nullptr, "illegal class");
1568 JvmtiVMObjectAllocEventCollector oam;
1569 ResourceMark rm(THREAD);
1570 oop mirror = JNIHandles::resolve_non_null(cls);
1571 // Return null for arrays and primitives
1572 if (!java_lang_Class::is_primitive(mirror)) {
1573 Klass* k = java_lang_Class::as_Klass(mirror);
1574 if (k->is_instance_klass()) {
1575 Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1576 if (sym == nullptr) return nullptr;
1577 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1578 return (jstring) JNIHandles::make_local(THREAD, str());
1579 }
1580 }
1581 return nullptr;
1582 JVM_END
1583
1584
1585 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1586 assert (cls != nullptr, "illegal class");
1587 oop mirror = JNIHandles::resolve_non_null(cls);
1588 // Return null for arrays and primitives
1589 if (!java_lang_Class::is_primitive(mirror)) {
1590 Klass* k = java_lang_Class::as_Klass(mirror);
1591 if (k->is_instance_klass()) {
1592 typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1593 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1594 }
1595 }
1596 return nullptr;
1597 JVM_END
1598
1599
1600 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1601 // some of this code was adapted from from jni_FromReflectedField
1602
1603 oop reflected = JNIHandles::resolve_non_null(field);
1604 oop mirror = java_lang_reflect_Field::clazz(reflected);
1605 int slot = java_lang_reflect_Field::slot(reflected);
1606 int modifiers = java_lang_reflect_Field::modifiers(reflected);
1607
1608 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1609 int offset = ik->field_offset(slot);
1610
1611 if (modifiers & JVM_ACC_STATIC) {
1612 // for static fields we only look in the current class
1613 if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1614 assert(false, "cannot find static field");
1615 return false;
1616 }
1617 } else {
1618 // for instance fields we start with the current class and work
1619 // our way up through the superclass chain
1620 if (!ik->find_field_from_offset(offset, false, &fd)) {
1621 assert(false, "cannot find instance field");
1622 return false;
1623 }
1624 }
1625 return true;
1626 }
1627
1628 static Method* jvm_get_method_common(jobject method) {
1629 // some of this code was adapted from from jni_FromReflectedMethod
1630
1631 oop reflected = JNIHandles::resolve_non_null(method);
1632 oop mirror = nullptr;
1633 int slot = 0;
1634
1635 if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1636 mirror = java_lang_reflect_Constructor::clazz(reflected);
1637 slot = java_lang_reflect_Constructor::slot(reflected);
1638 } else {
1639 assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1640 "wrong type");
1641 mirror = java_lang_reflect_Method::clazz(reflected);
1642 slot = java_lang_reflect_Method::slot(reflected);
1643 }
1644 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1645
1646 Method* m = ik->method_with_idnum(slot);
1647 assert(m != nullptr, "cannot find method");
1648 return m; // caller has to deal with null in product mode
1649 }
1650
1651 /* Type use annotations support (JDK 1.8) */
1652
1653 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1654 assert (cls != nullptr, "illegal class");
1655 ResourceMark rm(THREAD);
1656 // Return null for arrays and primitives
1657 if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1658 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1659 if (k->is_instance_klass()) {
1660 AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1661 if (type_annotations != nullptr) {
1662 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1663 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1664 }
1665 }
1666 }
1667 return nullptr;
1668 JVM_END
1669
1670 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1671 assert (method != nullptr, "illegal method");
1672 // method is a handle to a java.lang.reflect.Method object
1673 Method* m = jvm_get_method_common(method);
1674 if (m == nullptr) {
1675 return nullptr;
1676 }
1677
1678 AnnotationArray* type_annotations = m->type_annotations();
1679 if (type_annotations != nullptr) {
1680 typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1681 return (jbyteArray) JNIHandles::make_local(THREAD, a);
1682 }
1683
1684 return nullptr;
1685 JVM_END
1686
1687 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1688 assert (field != nullptr, "illegal field");
1689 fieldDescriptor fd;
1690 bool gotFd = jvm_get_field_common(field, fd);
1691 if (!gotFd) {
1692 return nullptr;
1693 }
1694
1695 return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1696 JVM_END
1697
1698 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1699 if (!cp->is_within_bounds(index)) {
1700 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1701 }
1702 }
1703
1704 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1705 {
1706 // method is a handle to a java.lang.reflect.Method object
1707 Method* method_ptr = jvm_get_method_common(method);
1708 methodHandle mh (THREAD, method_ptr);
1709 Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1710 const int num_params = mh->method_parameters_length();
1711
1712 if (num_params < 0) {
1713 // A -1 return value from method_parameters_length means there is no
1714 // parameter data. Return null to indicate this to the reflection
1715 // API.
1716 assert(num_params == -1, "num_params should be -1 if it is less than zero");
1717 return (jobjectArray)nullptr;
1718 } else {
1719 // Otherwise, we return something up to reflection, even if it is
1720 // a zero-length array. Why? Because in some cases this can
1721 // trigger a MalformedParametersException.
1722
1723 // make sure all the symbols are properly formatted
1724 for (int i = 0; i < num_params; i++) {
1725 MethodParametersElement* params = mh->method_parameters_start();
1726 int index = params[i].name_cp_index;
1727 constantPoolHandle cp(THREAD, mh->constants());
1728 bounds_check(cp, index, CHECK_NULL);
1729
1730 if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1731 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1732 "Wrong type at constant pool index");
1733 }
1734
1735 }
1736
1737 objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1738 objArrayHandle result (THREAD, result_oop);
1739
1740 for (int i = 0; i < num_params; i++) {
1741 MethodParametersElement* params = mh->method_parameters_start();
1742 // For a 0 index, give a null symbol
1743 Symbol* sym = 0 != params[i].name_cp_index ?
1744 mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1745 int flags = params[i].flags;
1746 oop param = Reflection::new_parameter(reflected_method, i, sym,
1747 flags, CHECK_NULL);
1748 result->obj_at_put(i, param);
1749 }
1750 return (jobjectArray)JNIHandles::make_local(THREAD, result());
1751 }
1752 }
1753 JVM_END
1754
1755 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1756
1757 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1758 {
1759 JvmtiVMObjectAllocEventCollector oam;
1760
1761 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1762 // Exclude primitive types and array types
1763 if (java_lang_Class::is_primitive(ofMirror) ||
1764 java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1765 // Return empty array
1766 oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1767 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1768 }
1769
1770 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1771 constantPoolHandle cp(THREAD, k->constants());
1772
1773 // Ensure class is linked
1774 k->link_class(CHECK_NULL);
1775
1776 // Allocate result
1777 int num_fields;
1778
1779 if (publicOnly) {
1780 num_fields = 0;
1781 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1782 if (fs.access_flags().is_public()) ++num_fields;
1783 }
1784 } else {
1785 num_fields = k->java_fields_count();
1786 }
1787
1788 objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1789 objArrayHandle result (THREAD, r);
1790
1791 int out_idx = 0;
1792 fieldDescriptor fd;
1793 for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1794 if (!publicOnly || fs.access_flags().is_public()) {
1795 fd.reinitialize(k, fs.to_FieldInfo());
1796 oop field = Reflection::new_field(&fd, CHECK_NULL);
1797 result->obj_at_put(out_idx, field);
1798 ++out_idx;
1799 }
1800 }
1801 assert(out_idx == num_fields, "just checking");
1802 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1803 }
1804 JVM_END
1805
1806 // A class is a record if and only if it is final and a direct subclass of
1807 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1808 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1809 {
1810 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1811 if (k != nullptr && k->is_instance_klass()) {
1812 InstanceKlass* ik = InstanceKlass::cast(k);
1813 return ik->is_record();
1814 } else {
1815 return false;
1816 }
1817 }
1818 JVM_END
1819
1820 // Returns an array containing the components of the Record attribute,
1821 // or null if the attribute is not present.
1822 //
1823 // Note that this function returns the components of the Record attribute
1824 // even if the class is not a record.
1825 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1826 {
1827 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1828
1829 Array<RecordComponent*>* components = ik->record_components();
1830 if (components != nullptr) {
1831 JvmtiVMObjectAllocEventCollector oam;
1832 constantPoolHandle cp(THREAD, ik->constants());
1833 int length = components->length();
1834 assert(length >= 0, "unexpected record_components length");
1835 objArrayOop record_components =
1836 oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1837 objArrayHandle components_h (THREAD, record_components);
1838
1839 for (int x = 0; x < length; x++) {
1840 RecordComponent* component = components->at(x);
1841 assert(component != nullptr, "unexpected null record component");
1842 oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1843 components_h->obj_at_put(x, component_oop);
1844 }
1845 return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1846 }
1847
1848 return nullptr;
1849 }
1850 JVM_END
1851
1852 static jobjectArray get_class_declared_methods_helper(
1853 JNIEnv *env,
1854 jclass ofClass, jboolean publicOnly,
1855 bool want_constructor,
1856 Klass* klass, TRAPS) {
1857
1858 JvmtiVMObjectAllocEventCollector oam;
1859
1860 oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1861 // Exclude primitive types and array types
1862 if (java_lang_Class::is_primitive(ofMirror)
1863 || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1864 // Return empty array
1865 oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1866 return (jobjectArray) JNIHandles::make_local(THREAD, res);
1867 }
1868
1869 InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1870
1871 // Ensure class is linked
1872 k->link_class(CHECK_NULL);
1873
1874 Array<Method*>* methods = k->methods();
1875 int methods_length = methods->length();
1876
1877 // Save original method_idnum in case of redefinition, which can change
1878 // the idnum of obsolete methods. The new method will have the same idnum
1879 // but if we refresh the methods array, the counts will be wrong.
1880 ResourceMark rm(THREAD);
1881 GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1882 int num_methods = 0;
1883
1884 // Select methods matching the criteria.
1885 for (int i = 0; i < methods_length; i++) {
1886 Method* method = methods->at(i);
1887 if (want_constructor && !method->is_object_constructor()) {
1888 continue;
1889 }
1890 if (!want_constructor &&
1891 (method->is_object_constructor() || method->is_class_initializer() ||
1892 method->is_overpass())) {
1893 continue;
1894 }
1895 if (publicOnly && !method->is_public()) {
1896 continue;
1897 }
1898 idnums->push(method->method_idnum());
1899 ++num_methods;
1900 }
1901
1902 // Allocate result
1903 objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1904 objArrayHandle result (THREAD, r);
1905
1906 // Now just put the methods that we selected above, but go by their idnum
1907 // in case of redefinition. The methods can be redefined at any safepoint,
1908 // so above when allocating the oop array and below when creating reflect
1909 // objects.
1910 for (int i = 0; i < num_methods; i++) {
1911 methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1912 if (method.is_null()) {
1913 // Method may have been deleted and seems this API can handle null
1914 // Otherwise should probably put a method that throws NSME
1915 result->obj_at_put(i, nullptr);
1916 } else {
1917 oop m;
1918 if (want_constructor) {
1919 assert(method->is_object_constructor(), "must be");
1920 m = Reflection::new_constructor(method, CHECK_NULL);
1921 } else {
1922 m = Reflection::new_method(method, false, CHECK_NULL);
1923 }
1924 result->obj_at_put(i, m);
1925 }
1926 }
1927
1928 return (jobjectArray) JNIHandles::make_local(THREAD, result());
1929 }
1930
1931 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1932 {
1933 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1934 /*want_constructor*/ false,
1935 vmClasses::reflect_Method_klass(), THREAD);
1936 }
1937 JVM_END
1938
1939 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1940 {
1941 return get_class_declared_methods_helper(env, ofClass, publicOnly,
1942 /*want_constructor*/ true,
1943 vmClasses::reflect_Constructor_klass(), THREAD);
1944 }
1945 JVM_END
1946
1947 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1948 {
1949 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1950 InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1951 return c->has_nestmate_access_to(m, THREAD);
1952 }
1953 JVM_END
1954
1955 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1956 {
1957 // current is not a primitive or array class
1958 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1959 InstanceKlass* host = c->nest_host(THREAD);
1960 return (jclass) (host == nullptr ? nullptr :
1961 JNIHandles::make_local(THREAD, host->java_mirror()));
1962 }
1963 JVM_END
1964
1965 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1966 {
1967 // current is not a primitive or array class
1968 ResourceMark rm(THREAD);
1969 InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1970 InstanceKlass* host = c->nest_host(THREAD);
1971
1972 log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1973 c->external_name(), host->external_name());
1974 {
1975 JvmtiVMObjectAllocEventCollector oam;
1976 Array<u2>* members = host->nest_members();
1977 int length = members == nullptr ? 0 : members->length();
1978
1979 log_trace(class, nestmates)(" - host has %d listed nest members", length);
1980
1981 // nest host is first in the array so make it one bigger
1982 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length + 1, CHECK_NULL);
1983 refArrayHandle result(THREAD, r);
1984 result->obj_at_put(0, host->java_mirror());
1985 if (length != 0) {
1986 int count = 0;
1987 for (int i = 0; i < length; i++) {
1988 int cp_index = members->at(i);
1989 Klass* k = host->constants()->klass_at(cp_index, THREAD);
1990 if (HAS_PENDING_EXCEPTION) {
1991 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1992 return nullptr; // propagate VMEs
1993 }
1994 if (log_is_enabled(Trace, class, nestmates)) {
1995 stringStream ss;
1996 char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1997 ss.print(" - resolution of nest member %s failed: ", target_member_class);
1998 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1999 log_trace(class, nestmates)("%s", ss.as_string());
2000 }
2001 CLEAR_PENDING_EXCEPTION;
2002 continue;
2003 }
2004 if (k->is_instance_klass()) {
2005 InstanceKlass* ik = InstanceKlass::cast(k);
2006 InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2007 if (nest_host_k == host) {
2008 result->obj_at_put(count+1, k->java_mirror());
2009 count++;
2010 log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2011 } else {
2012 log_trace(class, nestmates)(" - skipping member %s with different host %s",
2013 ik->external_name(), nest_host_k->external_name());
2014 }
2015 } else {
2016 log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2017 k->external_name());
2018 }
2019 }
2020 if (count < length) {
2021 // we had invalid entries so we need to compact the array
2022 log_trace(class, nestmates)(" - compacting array from length %d to %d",
2023 length + 1, count + 1);
2024
2025 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2026 count + 1, CHECK_NULL);
2027 objArrayHandle result2(THREAD, r2);
2028 for (int i = 0; i < count + 1; i++) {
2029 result2->obj_at_put(i, result->obj_at(i));
2030 }
2031 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2032 }
2033 }
2034 else {
2035 assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
2036 }
2037 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2038 }
2039 }
2040 JVM_END
2041
2042 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2043 {
2044 oop mirror = JNIHandles::resolve_non_null(current);
2045 assert(!java_lang_Class::is_primitive(mirror), "should not be");
2046 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2047
2048 ResourceMark rm(THREAD);
2049 log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2050 ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2051 if (ik->is_sealed()) {
2052 JvmtiVMObjectAllocEventCollector oam;
2053 Array<u2>* subclasses = ik->permitted_subclasses();
2054 int length = subclasses->length();
2055
2056 log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2057
2058 refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length, CHECK_NULL);
2059 refArrayHandle result(THREAD, r);
2060 int count = 0;
2061 for (int i = 0; i < length; i++) {
2062 int cp_index = subclasses->at(i);
2063 Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2064 if (HAS_PENDING_EXCEPTION) {
2065 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2066 return nullptr; // propagate VMEs
2067 }
2068 if (log_is_enabled(Trace, class, sealed)) {
2069 stringStream ss;
2070 char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2071 ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2072 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2073 log_trace(class, sealed)("%s", ss.as_string());
2074 }
2075
2076 CLEAR_PENDING_EXCEPTION;
2077 continue;
2078 }
2079 if (k->is_instance_klass()) {
2080 result->obj_at_put(count++, k->java_mirror());
2081 log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2082 }
2083 }
2084 if (count < length) {
2085 // we had invalid entries so we need to compact the array
2086 objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2087 count, CHECK_NULL);
2088 objArrayHandle result2(THREAD, r2);
2089 for (int i = 0; i < count; i++) {
2090 result2->obj_at_put(i, result->obj_at(i));
2091 }
2092 return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2093 }
2094 return (jobjectArray)JNIHandles::make_local(THREAD, result());
2095 } else {
2096 return nullptr;
2097 }
2098 }
2099 JVM_END
2100
2101 // Constant pool access //////////////////////////////////////////////////////////
2102
2103 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2104 {
2105 JvmtiVMObjectAllocEventCollector oam;
2106 oop mirror = JNIHandles::resolve_non_null(cls);
2107 // Return null for primitives and arrays
2108 if (!java_lang_Class::is_primitive(mirror)) {
2109 Klass* k = java_lang_Class::as_Klass(mirror);
2110 if (k->is_instance_klass()) {
2111 InstanceKlass* k_h = InstanceKlass::cast(k);
2112 Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2113 reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2114 return JNIHandles::make_local(THREAD, jcp());
2115 }
2116 }
2117 return nullptr;
2118 }
2119 JVM_END
2120
2121
2122 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2123 {
2124 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2125 return cp->length();
2126 }
2127 JVM_END
2128
2129
2130 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2131 {
2132 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2133 bounds_check(cp, index, CHECK_NULL);
2134 constantTag tag = cp->tag_at(index);
2135 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2136 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2137 }
2138 Klass* k = cp->klass_at(index, CHECK_NULL);
2139 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2140 }
2141 JVM_END
2142
2143 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2144 {
2145 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2146 bounds_check(cp, index, CHECK_NULL);
2147 constantTag tag = cp->tag_at(index);
2148 if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2149 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2150 }
2151 Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2152 if (k == nullptr) return nullptr;
2153 return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2154 }
2155 JVM_END
2156
2157 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2158 constantTag tag = cp->tag_at(index);
2159 if (!tag.is_method() && !tag.is_interface_method()) {
2160 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2161 }
2162 int klass_ref = cp->uncached_klass_ref_index_at(index);
2163 Klass* k_o;
2164 if (force_resolution) {
2165 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2166 } else {
2167 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2168 if (k_o == nullptr) return nullptr;
2169 }
2170 InstanceKlass* k = InstanceKlass::cast(k_o);
2171 Symbol* name = cp->uncached_name_ref_at(index);
2172 Symbol* sig = cp->uncached_signature_ref_at(index);
2173 methodHandle m (THREAD, k->find_method(name, sig));
2174 if (m.is_null()) {
2175 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2176 }
2177 oop method;
2178 if (m->is_object_constructor()) {
2179 method = Reflection::new_constructor(m, CHECK_NULL);
2180 } else {
2181 method = Reflection::new_method(m, true, CHECK_NULL);
2182 }
2183 return JNIHandles::make_local(THREAD, method);
2184 }
2185
2186 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2187 {
2188 JvmtiVMObjectAllocEventCollector oam;
2189 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2190 bounds_check(cp, index, CHECK_NULL);
2191 jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2192 return res;
2193 }
2194 JVM_END
2195
2196 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2197 {
2198 JvmtiVMObjectAllocEventCollector oam;
2199 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2200 bounds_check(cp, index, CHECK_NULL);
2201 jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2202 return res;
2203 }
2204 JVM_END
2205
2206 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2207 constantTag tag = cp->tag_at(index);
2208 if (!tag.is_field()) {
2209 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2210 }
2211 int klass_ref = cp->uncached_klass_ref_index_at(index);
2212 Klass* k_o;
2213 if (force_resolution) {
2214 k_o = cp->klass_at(klass_ref, CHECK_NULL);
2215 } else {
2216 k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2217 if (k_o == nullptr) return nullptr;
2218 }
2219 InstanceKlass* k = InstanceKlass::cast(k_o);
2220 Symbol* name = cp->uncached_name_ref_at(index);
2221 Symbol* sig = cp->uncached_signature_ref_at(index);
2222 fieldDescriptor fd;
2223 Klass* target_klass = k->find_field(name, sig, &fd);
2224 if (target_klass == nullptr) {
2225 THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2226 }
2227 oop field = Reflection::new_field(&fd, CHECK_NULL);
2228 return JNIHandles::make_local(THREAD, field);
2229 }
2230
2231 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2232 {
2233 JvmtiVMObjectAllocEventCollector oam;
2234 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2235 bounds_check(cp, index, CHECK_NULL);
2236 jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2237 return res;
2238 }
2239 JVM_END
2240
2241 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2242 {
2243 JvmtiVMObjectAllocEventCollector oam;
2244 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2245 bounds_check(cp, index, CHECK_NULL);
2246 jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2247 return res;
2248 }
2249 JVM_END
2250
2251 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2252 {
2253 JvmtiVMObjectAllocEventCollector oam;
2254 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2255 bounds_check(cp, index, CHECK_NULL);
2256 constantTag tag = cp->tag_at(index);
2257 if (!tag.is_field_or_method()) {
2258 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2259 }
2260 int klass_ref = cp->uncached_klass_ref_index_at(index);
2261 Symbol* klass_name = cp->klass_name_at(klass_ref);
2262 Symbol* member_name = cp->uncached_name_ref_at(index);
2263 Symbol* member_sig = cp->uncached_signature_ref_at(index);
2264 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2265 objArrayHandle dest(THREAD, dest_o);
2266 Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2267 dest->obj_at_put(0, str());
2268 str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2269 dest->obj_at_put(1, str());
2270 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2271 dest->obj_at_put(2, str());
2272 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2273 }
2274 JVM_END
2275
2276 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2277 {
2278 JvmtiVMObjectAllocEventCollector oam;
2279 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2280 bounds_check(cp, index, CHECK_0);
2281 constantTag tag = cp->tag_at(index);
2282 if (!tag.is_field_or_method()) {
2283 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2284 }
2285 return (jint) cp->uncached_klass_ref_index_at(index);
2286 }
2287 JVM_END
2288
2289 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2290 {
2291 JvmtiVMObjectAllocEventCollector oam;
2292 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2293 bounds_check(cp, index, CHECK_0);
2294 constantTag tag = cp->tag_at(index);
2295 if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2296 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2297 }
2298 return (jint) cp->uncached_name_and_type_ref_index_at(index);
2299 }
2300 JVM_END
2301
2302 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2303 {
2304 JvmtiVMObjectAllocEventCollector oam;
2305 constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2306 bounds_check(cp, index, CHECK_NULL);
2307 constantTag tag = cp->tag_at(index);
2308 if (!tag.is_name_and_type()) {
2309 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2310 }
2311 Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2312 Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2313 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2314 objArrayHandle dest(THREAD, dest_o);
2315 Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2316 dest->obj_at_put(0, str());
2317 str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2318 dest->obj_at_put(1, str());
2319 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2320 }
2321 JVM_END
2322
2323 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2324 {
2325 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2326 bounds_check(cp, index, CHECK_0);
2327 constantTag tag = cp->tag_at(index);
2328 if (!tag.is_int()) {
2329 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2330 }
2331 return cp->int_at(index);
2332 }
2333 JVM_END
2334
2335 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2336 {
2337 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2338 bounds_check(cp, index, CHECK_(0L));
2339 constantTag tag = cp->tag_at(index);
2340 if (!tag.is_long()) {
2341 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2342 }
2343 return cp->long_at(index);
2344 }
2345 JVM_END
2346
2347 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2348 {
2349 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2350 bounds_check(cp, index, CHECK_(0.0f));
2351 constantTag tag = cp->tag_at(index);
2352 if (!tag.is_float()) {
2353 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2354 }
2355 return cp->float_at(index);
2356 }
2357 JVM_END
2358
2359 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2360 {
2361 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2362 bounds_check(cp, index, CHECK_(0.0));
2363 constantTag tag = cp->tag_at(index);
2364 if (!tag.is_double()) {
2365 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2366 }
2367 return cp->double_at(index);
2368 }
2369 JVM_END
2370
2371 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2372 {
2373 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2374 bounds_check(cp, index, CHECK_NULL);
2375 constantTag tag = cp->tag_at(index);
2376 if (!tag.is_string()) {
2377 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2378 }
2379 oop str = cp->string_at(index, CHECK_NULL);
2380 return (jstring) JNIHandles::make_local(THREAD, str);
2381 }
2382 JVM_END
2383
2384 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2385 {
2386 JvmtiVMObjectAllocEventCollector oam;
2387 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2388 bounds_check(cp, index, CHECK_NULL);
2389 constantTag tag = cp->tag_at(index);
2390 if (!tag.is_symbol()) {
2391 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2392 }
2393 Symbol* sym = cp->symbol_at(index);
2394 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2395 return (jstring) JNIHandles::make_local(THREAD, str());
2396 }
2397 JVM_END
2398
2399 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2400 {
2401 constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2402 bounds_check(cp, index, CHECK_0);
2403 constantTag tag = cp->tag_at(index);
2404 jbyte result = tag.value();
2405 // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2406 // they are changed to the corresponding tags from the JVM spec, so that java code in
2407 // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2408 if (tag.is_klass_or_reference()) {
2409 result = JVM_CONSTANT_Class;
2410 } else if (tag.is_string_index()) {
2411 result = JVM_CONSTANT_String;
2412 } else if (tag.is_method_type_in_error()) {
2413 result = JVM_CONSTANT_MethodType;
2414 } else if (tag.is_method_handle_in_error()) {
2415 result = JVM_CONSTANT_MethodHandle;
2416 } else if (tag.is_dynamic_constant_in_error()) {
2417 result = JVM_CONSTANT_Dynamic;
2418 }
2419 return result;
2420 }
2421 JVM_END
2422
2423 // Assertion support. //////////////////////////////////////////////////////////
2424
2425 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2426 assert(cls != nullptr, "bad class");
2427
2428 oop r = JNIHandles::resolve(cls);
2429 assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2430 if (java_lang_Class::is_primitive(r)) return false;
2431
2432 Klass* k = java_lang_Class::as_Klass(r);
2433 assert(k->is_instance_klass(), "must be an instance klass");
2434 if (!k->is_instance_klass()) return false;
2435
2436 ResourceMark rm(THREAD);
2437 const char* name = k->name()->as_C_string();
2438 bool system_class = k->class_loader() == nullptr;
2439 return JavaAssertions::enabled(name, system_class);
2440
2441 JVM_END
2442
2443
2444 // Return a new AssertionStatusDirectives object with the fields filled in with
2445 // command-line assertion arguments (i.e., -ea, -da).
2446 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2447 JvmtiVMObjectAllocEventCollector oam;
2448 oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2449 return JNIHandles::make_local(THREAD, asd);
2450 JVM_END
2451
2452 // Verification ////////////////////////////////////////////////////////////////////////////////
2453
2454 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2455
2456 // RedefineClasses support: bug 6214132 caused verification to fail.
2457 // All functions from this section, unless noted otherwise, should call the functions
2458 // get_klass_considering_redefinition(), or
2459 // get_instance_klass_considering_redefinition()
2460 // These functions return JvmtiThreadState::_scratch_class if the verifier
2461 // was invoked in the middle of the redefinition of cls.
2462 // See jvmtiThreadState.hpp for details.
2463
2464 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2465 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2466 if (k->is_instance_klass()) {
2467 return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2468 } else {
2469 return k;
2470 }
2471 }
2472
2473 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2474 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2475 return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2476 }
2477
2478 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2479 oop mirror = JNIHandles::resolve_non_null(cls);
2480 if (java_lang_Class::is_primitive(mirror)) {
2481 return JNI_FALSE;
2482 }
2483 Klass* k = java_lang_Class::as_Klass(mirror);
2484 // This isn't necessary since answer is the same because redefinition
2485 // has already checked this matches for the scratch class.
2486 // k = get_klass_considering_redefinition(cls, thread)
2487 jboolean result = k->is_interface();
2488 assert(!result || k->is_instance_klass(),
2489 "all interfaces are instance types");
2490 return result;
2491 JVM_END
2492
2493 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2494 // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2495 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2496 return k->name()->as_utf8();
2497 JVM_END
2498
2499
2500 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2501 Klass* k = get_klass_considering_redefinition(cls, thread);
2502 // types will have length zero if this is not an InstanceKlass
2503 // (length is determined by call to JVM_GetClassCPEntriesCount)
2504 if (k->is_instance_klass()) {
2505 ConstantPool* cp = InstanceKlass::cast(k)->constants();
2506 for (int index = cp->length() - 1; index >= 0; index--) {
2507 constantTag tag = cp->tag_at(index);
2508 types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2509 }
2510 }
2511 JVM_END
2512
2513
2514 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2515 Klass* k = get_klass_considering_redefinition(cls, thread);
2516 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2517 JVM_END
2518
2519
2520 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2521 Klass* k = get_klass_considering_redefinition(cls, thread);
2522 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2523 JVM_END
2524
2525
2526 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2527 Klass* k = get_klass_considering_redefinition(cls, thread);
2528 return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2529 JVM_END
2530
2531
2532 // The following methods, used for the verifier, are never called with
2533 // array klasses, so a direct cast to InstanceKlass is safe.
2534 // Typically, these methods are called in a loop with bounds determined
2535 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2536 // zero for arrays.
2537 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2538 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2539 Method* method = ik->methods()->at(method_index);
2540 int length = method->checked_exceptions_length();
2541 if (length > 0) {
2542 CheckedExceptionElement* table= method->checked_exceptions_start();
2543 for (int i = 0; i < length; i++) {
2544 exceptions[i] = table[i].class_cp_index;
2545 }
2546 }
2547 JVM_END
2548
2549
2550 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2551 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2552 Method* method = ik->methods()->at(method_index);
2553 return method->checked_exceptions_length();
2554 JVM_END
2555
2556
2557 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2558 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2559 Method* method = ik->methods()->at(method_index);
2560 memcpy(code, method->code_base(), method->code_size());
2561 JVM_END
2562
2563
2564 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2565 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2566 Method* method = ik->methods()->at(method_index);
2567 return method->code_size();
2568 JVM_END
2569
2570
2571 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2572 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2573 Method* method = ik->methods()->at(method_index);
2574 ExceptionTable extable(method);
2575 entry->start_pc = extable.start_pc(entry_index);
2576 entry->end_pc = extable.end_pc(entry_index);
2577 entry->handler_pc = extable.handler_pc(entry_index);
2578 entry->catchType = extable.catch_type_index(entry_index);
2579 JVM_END
2580
2581
2582 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2583 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2584 Method* method = ik->methods()->at(method_index);
2585 return method->exception_table_length();
2586 JVM_END
2587
2588
2589 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2590 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2591 Method* method = ik->methods()->at(method_index);
2592 return method->access_flags().as_method_flags();
2593 JVM_END
2594
2595
2596 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2597 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2598 return ik->field_access_flags(field_index);
2599 JVM_END
2600
2601
2602 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2603 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2604 Method* method = ik->methods()->at(method_index);
2605 return method->max_locals();
2606 JVM_END
2607
2608
2609 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2610 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2611 Method* method = ik->methods()->at(method_index);
2612 return method->size_of_parameters();
2613 JVM_END
2614
2615
2616 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2617 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2618 Method* method = ik->methods()->at(method_index);
2619 return method->verifier_max_stack();
2620 JVM_END
2621
2622
2623 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2624 ResourceMark rm(THREAD);
2625 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2626 Method* method = ik->methods()->at(method_index);
2627 return method->is_object_constructor();
2628 JVM_END
2629
2630
2631 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2632 ResourceMark rm(THREAD);
2633 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2634 Method* method = ik->methods()->at(method_index);
2635 return method->is_overpass();
2636 JVM_END
2637
2638 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2639 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2640 Method* method = ik->methods()->at(method_index);
2641 return method->name()->as_utf8();
2642 JVM_END
2643
2644
2645 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2646 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2647 Method* method = ik->methods()->at(method_index);
2648 return method->signature()->as_utf8();
2649 JVM_END
2650
2651 /**
2652 * All of these JVM_GetCP-xxx methods are used by the old verifier to
2653 * read entries in the constant pool. Since the old verifier always
2654 * works on a copy of the code, it will not see any rewriting that
2655 * may possibly occur in the middle of verification. So it is important
2656 * that nothing it calls tries to use the cpCache instead of the raw
2657 * constant pool, so we must use cp->uncached_x methods when appropriate.
2658 */
2659 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(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_name_ref_at(cp_index)->as_utf8();
2665 default:
2666 fatal("JVM_GetCPFieldNameUTF: illegal constant");
2667 }
2668 ShouldNotReachHere();
2669 return nullptr;
2670 JVM_END
2671
2672
2673 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2674 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2675 ConstantPool* cp = ik->constants();
2676 switch (cp->tag_at(cp_index).value()) {
2677 case JVM_CONSTANT_InterfaceMethodref:
2678 case JVM_CONSTANT_Methodref:
2679 return cp->uncached_name_ref_at(cp_index)->as_utf8();
2680 default:
2681 fatal("JVM_GetCPMethodNameUTF: illegal constant");
2682 }
2683 ShouldNotReachHere();
2684 return nullptr;
2685 JVM_END
2686
2687
2688 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2689 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2690 ConstantPool* cp = ik->constants();
2691 switch (cp->tag_at(cp_index).value()) {
2692 case JVM_CONSTANT_InterfaceMethodref:
2693 case JVM_CONSTANT_Methodref:
2694 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2695 default:
2696 fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2697 }
2698 ShouldNotReachHere();
2699 return nullptr;
2700 JVM_END
2701
2702
2703 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2704 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2705 ConstantPool* cp = ik->constants();
2706 switch (cp->tag_at(cp_index).value()) {
2707 case JVM_CONSTANT_Fieldref:
2708 return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2709 default:
2710 fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2711 }
2712 ShouldNotReachHere();
2713 return nullptr;
2714 JVM_END
2715
2716
2717 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2718 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2719 ConstantPool* cp = ik->constants();
2720 Symbol* classname = cp->klass_name_at(cp_index);
2721 return classname->as_utf8();
2722 JVM_END
2723
2724
2725 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2726 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2727 ConstantPool* cp = ik->constants();
2728 switch (cp->tag_at(cp_index).value()) {
2729 case JVM_CONSTANT_Fieldref: {
2730 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2731 Symbol* classname = cp->klass_name_at(class_index);
2732 return classname->as_utf8();
2733 }
2734 default:
2735 fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2736 }
2737 ShouldNotReachHere();
2738 return nullptr;
2739 JVM_END
2740
2741
2742 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2743 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2744 ConstantPool* cp = ik->constants();
2745 switch (cp->tag_at(cp_index).value()) {
2746 case JVM_CONSTANT_Methodref:
2747 case JVM_CONSTANT_InterfaceMethodref: {
2748 int class_index = cp->uncached_klass_ref_index_at(cp_index);
2749 Symbol* classname = cp->klass_name_at(class_index);
2750 return classname->as_utf8();
2751 }
2752 default:
2753 fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2754 }
2755 ShouldNotReachHere();
2756 return nullptr;
2757 JVM_END
2758
2759
2760 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2761 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2762 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2763 ConstantPool* cp = ik->constants();
2764 ConstantPool* cp_called = ik_called->constants();
2765 switch (cp->tag_at(cp_index).value()) {
2766 case JVM_CONSTANT_Fieldref: {
2767 Symbol* name = cp->uncached_name_ref_at(cp_index);
2768 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2769 for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2770 if (fs.name() == name && fs.signature() == signature) {
2771 return fs.access_flags().as_field_flags();
2772 }
2773 }
2774 return -1;
2775 }
2776 default:
2777 fatal("JVM_GetCPFieldModifiers: illegal constant");
2778 }
2779 ShouldNotReachHere();
2780 return 0;
2781 JVM_END
2782
2783
2784 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2785 InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2786 InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2787 ConstantPool* cp = ik->constants();
2788 switch (cp->tag_at(cp_index).value()) {
2789 case JVM_CONSTANT_Methodref:
2790 case JVM_CONSTANT_InterfaceMethodref: {
2791 Symbol* name = cp->uncached_name_ref_at(cp_index);
2792 Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2793 Array<Method*>* methods = ik_called->methods();
2794 int methods_count = methods->length();
2795 for (int i = 0; i < methods_count; i++) {
2796 Method* method = methods->at(i);
2797 if (method->name() == name && method->signature() == signature) {
2798 return method->access_flags().as_method_flags();
2799 }
2800 }
2801 return -1;
2802 }
2803 default:
2804 fatal("JVM_GetCPMethodModifiers: illegal constant");
2805 }
2806 ShouldNotReachHere();
2807 return 0;
2808 JVM_END
2809
2810
2811 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2812
2813 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2814 // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2815 JVM_END
2816
2817
2818 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2819 oop class1_mirror = JNIHandles::resolve_non_null(class1);
2820 oop class2_mirror = JNIHandles::resolve_non_null(class2);
2821 Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2822 Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2823 return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2824 JVM_END
2825
2826 // Printing support //////////////////////////////////////////////////
2827 extern "C" {
2828
2829 ATTRIBUTE_PRINTF(3, 0)
2830 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2831 // Reject count values that are negative signed values converted to
2832 // unsigned; see bug 4399518, 4417214
2833 if ((intptr_t)count <= 0) return -1;
2834
2835 int result = os::vsnprintf(str, count, fmt, args);
2836 if (result > 0 && (size_t)result >= count) {
2837 result = -1;
2838 }
2839
2840 return result;
2841 }
2842
2843 ATTRIBUTE_PRINTF(3, 4)
2844 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2845 va_list args;
2846 int len;
2847 va_start(args, fmt);
2848 len = jio_vsnprintf(str, count, fmt, args);
2849 va_end(args);
2850 return len;
2851 }
2852
2853 ATTRIBUTE_PRINTF(2, 3)
2854 int jio_fprintf(FILE* f, const char *fmt, ...) {
2855 int len;
2856 va_list args;
2857 va_start(args, fmt);
2858 len = jio_vfprintf(f, fmt, args);
2859 va_end(args);
2860 return len;
2861 }
2862
2863 ATTRIBUTE_PRINTF(2, 0)
2864 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2865 if (Arguments::vfprintf_hook() != nullptr) {
2866 return Arguments::vfprintf_hook()(f, fmt, args);
2867 } else {
2868 return vfprintf(f, fmt, args);
2869 }
2870 }
2871
2872 ATTRIBUTE_PRINTF(1, 2)
2873 JNIEXPORT int jio_printf(const char *fmt, ...) {
2874 int len;
2875 va_list args;
2876 va_start(args, fmt);
2877 len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2878 va_end(args);
2879 return len;
2880 }
2881
2882 // HotSpot specific jio method
2883 void jio_print(const char* s, size_t len) {
2884 // Try to make this function as atomic as possible.
2885 if (Arguments::vfprintf_hook() != nullptr) {
2886 jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2887 } else {
2888 // Make an unused local variable to avoid warning from gcc compiler.
2889 bool dummy = os::write(defaultStream::output_fd(), s, len);
2890 }
2891 }
2892
2893 } // Extern C
2894
2895 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2896
2897 // In most of the JVM thread support functions we need to access the
2898 // thread through a ThreadsListHandle to prevent it from exiting and
2899 // being reclaimed while we try to operate on it. The exceptions to this
2900 // rule are when operating on the current thread, or if the monitor of
2901 // the target java.lang.Thread is locked at the Java level - in both
2902 // cases the target cannot exit.
2903
2904 static void thread_entry(JavaThread* thread, TRAPS) {
2905 HandleMark hm(THREAD);
2906 Handle obj(THREAD, thread->threadObj());
2907 JavaValue result(T_VOID);
2908 JavaCalls::call_virtual(&result,
2909 obj,
2910 vmClasses::Thread_klass(),
2911 vmSymbols::run_method_name(),
2912 vmSymbols::void_method_signature(),
2913 THREAD);
2914 }
2915
2916
2917 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2918 #if INCLUDE_CDS
2919 if (CDSConfig::allow_only_single_java_thread()) {
2920 // During java -Xshare:dump, if we allow multiple Java threads to
2921 // execute in parallel, symbols and classes may be loaded in
2922 // random orders which will make the resulting CDS archive
2923 // non-deterministic.
2924 //
2925 // Lucikly, during java -Xshare:dump, it's important to run only
2926 // the code in the main Java thread (which is NOT started here) that
2927 // creates the module graph, etc. It's safe to not start the other
2928 // threads which are launched by class static initializers
2929 // (ReferenceHandler, FinalizerThread and CleanerImpl).
2930 if (log_is_enabled(Info, aot)) {
2931 ResourceMark rm;
2932 oop t = JNIHandles::resolve_non_null(jthread);
2933 log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2934 }
2935 return;
2936 }
2937 #endif
2938 JavaThread *native_thread = nullptr;
2939
2940 // We cannot hold the Threads_lock when we throw an exception,
2941 // due to rank ordering issues. Example: we might need to grab the
2942 // Heap_lock while we construct the exception.
2943 bool throw_illegal_thread_state = false;
2944
2945 // We must release the Threads_lock before we can post a jvmti event
2946 // in Thread::start.
2947 {
2948 ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2949 // Ensure that the C++ Thread and OSThread structures aren't freed before
2950 // we operate.
2951 MutexLocker ml(Threads_lock);
2952
2953 // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2954 // re-starting an already started thread, so we should usually find
2955 // that the JavaThread is null. However for a JNI attached thread
2956 // there is a small window between the Thread object being created
2957 // (with its JavaThread set) and the update to its threadStatus, so we
2958 // have to check for this
2959 if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2960 throw_illegal_thread_state = true;
2961 } else {
2962 jlong size =
2963 java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2964 // Allocate the C++ Thread structure and create the native thread. The
2965 // stack size retrieved from java is 64-bit signed, but the constructor takes
2966 // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2967 // - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2968 // - Avoid passing negative values which would result in really large stacks.
2969 NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2970 size_t sz = size > 0 ? (size_t) size : 0;
2971 native_thread = new JavaThread(&thread_entry, sz);
2972
2973 // At this point it may be possible that no osthread was created for the
2974 // JavaThread due to lack of memory. Check for this situation and throw
2975 // an exception if necessary. Eventually we may want to change this so
2976 // that we only grab the lock if the thread was created successfully -
2977 // then we can also do this check and throw the exception in the
2978 // JavaThread constructor.
2979 if (native_thread->osthread() != nullptr) {
2980 // Note: the current thread is not being used within "prepare".
2981 native_thread->prepare(jthread);
2982 }
2983 }
2984 }
2985
2986 if (throw_illegal_thread_state) {
2987 THROW(vmSymbols::java_lang_IllegalThreadStateException());
2988 }
2989
2990 assert(native_thread != nullptr, "Starting null thread?");
2991
2992 if (native_thread->osthread() == nullptr) {
2993 ResourceMark rm(thread);
2994 log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2995 JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2996 // No one should hold a reference to the 'native_thread'.
2997 native_thread->smr_delete();
2998 if (JvmtiExport::should_post_resource_exhausted()) {
2999 JvmtiExport::post_resource_exhausted(
3000 JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3001 os::native_thread_creation_failed_msg());
3002 }
3003 THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3004 os::native_thread_creation_failed_msg());
3005 }
3006
3007 JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3008
3009 Thread::start(native_thread);
3010
3011 JVM_END
3012
3013
3014 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3015 ThreadsListHandle tlh(thread);
3016 oop java_thread = nullptr;
3017 JavaThread* receiver = nullptr;
3018 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3019 java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3020
3021 if (is_alive) {
3022 // jthread refers to a live JavaThread.
3023 Thread::set_priority(receiver, (ThreadPriority)prio);
3024 }
3025 // Implied else: If the JavaThread hasn't started yet, then the
3026 // priority set in the java.lang.Thread object above will be pushed
3027 // down when it does start.
3028 JVM_END
3029
3030
3031 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3032 HOTSPOT_THREAD_YIELD();
3033 os::naked_yield();
3034 JVM_END
3035
3036 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3037 if (nanos < 0) {
3038 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3039 }
3040
3041 if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3042 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3043 }
3044
3045 // Save current thread state and restore it at the end of this block.
3046 // And set new thread state to SLEEPING.
3047 JavaThreadSleepState jtss(thread);
3048
3049 HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3050
3051 if (nanos == 0) {
3052 os::naked_yield();
3053 } else {
3054 ThreadState old_state = thread->osthread()->get_state();
3055 thread->osthread()->set_state(SLEEPING);
3056 if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3057 // An asynchronous exception could have been thrown on
3058 // us while we were sleeping. We do not overwrite those.
3059 if (!HAS_PENDING_EXCEPTION) {
3060 HOTSPOT_THREAD_SLEEP_END(1);
3061 if (!thread->has_async_exception_condition()) {
3062 // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3063 // to properly restore the thread state. That's likely wrong.
3064 THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3065 }
3066 }
3067 }
3068 thread->osthread()->set_state(old_state);
3069 }
3070 HOTSPOT_THREAD_SLEEP_END(0);
3071 JVM_END
3072
3073 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3074 oop jthread = thread->threadObj();
3075 assert(jthread != nullptr, "no current carrier thread!");
3076 return JNIHandles::make_local(THREAD, jthread);
3077 JVM_END
3078
3079 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3080 oop theThread = thread->vthread();
3081 assert(theThread != (oop)nullptr, "no current thread!");
3082 return JNIHandles::make_local(THREAD, theThread);
3083 JVM_END
3084
3085 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3086 jobject theThread))
3087 oop threadObj = JNIHandles::resolve(theThread);
3088 thread->set_vthread(threadObj);
3089
3090 // Set _monitor_owner_id of new current Thread
3091 thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3092
3093 JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3094 JVM_END
3095
3096 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3097 return ThreadIdentifier::unsafe_offset();
3098 JVM_END
3099
3100 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3101 ThreadsListHandle tlh(thread);
3102 JavaThread* receiver = nullptr;
3103 bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3104 if (is_alive) {
3105 // jthread refers to a live JavaThread.
3106 receiver->interrupt();
3107 }
3108 JVM_END
3109
3110 // Return true iff the current thread has locked the object passed in
3111
3112 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3113 if (obj == nullptr) {
3114 THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3115 }
3116 Handle h_obj(THREAD, JNIHandles::resolve(obj));
3117 return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3118 JVM_END
3119
3120 JVM_ENTRY(jobjectArray, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3121 oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3122 return (jobjectArray) JNIHandles::make_local(THREAD, trace);
3123 JVM_END
3124
3125 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3126 oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3127 return JNIHandles::make_local(THREAD, snapshot);
3128 JVM_END
3129
3130 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3131 // We don't use a ThreadsListHandle here because the current thread
3132 // must be alive.
3133 oop java_thread = JNIHandles::resolve_non_null(jthread);
3134 JavaThread* thr = java_lang_Thread::thread(java_thread);
3135 if (thread == thr && !thr->has_attached_via_jni()) {
3136 // Thread naming is only supported for the current thread and
3137 // we don't set the name of an attached thread to avoid stepping
3138 // on other programs.
3139 ResourceMark rm(thread);
3140 const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3141 os::set_native_thread_name(thread_name);
3142 }
3143 JVM_END
3144
3145 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3146 oop theCache = thread->scopedValueCache();
3147 return JNIHandles::make_local(THREAD, theCache);
3148 JVM_END
3149
3150 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3151 jobject theCache))
3152 arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3153 thread->set_scopedValueCache(objs);
3154 JVM_END
3155
3156
3157 // java.lang.Package ////////////////////////////////////////////////////////////////
3158
3159
3160 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3161 ResourceMark rm(THREAD);
3162 JvmtiVMObjectAllocEventCollector oam;
3163 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3164 oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3165 return (jstring) JNIHandles::make_local(THREAD, result);
3166 JVM_END
3167
3168
3169 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3170 JvmtiVMObjectAllocEventCollector oam;
3171 objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3172 return (jobjectArray) JNIHandles::make_local(THREAD, result);
3173 JVM_END
3174
3175
3176 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3177
3178
3179 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3180 MonitorLocker ml(Heap_lock);
3181 oop ref = Universe::reference_pending_list();
3182 if (ref != nullptr) {
3183 Universe::clear_reference_pending_list();
3184 }
3185 return JNIHandles::make_local(THREAD, ref);
3186 JVM_END
3187
3188 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3189 MonitorLocker ml(Heap_lock);
3190 return Universe::has_reference_pending_list();
3191 JVM_END
3192
3193 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3194 MonitorLocker ml(Heap_lock);
3195 while (!Universe::has_reference_pending_list()) {
3196 ml.wait();
3197 }
3198 JVM_END
3199
3200 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3201 oop ref_oop = JNIHandles::resolve_non_null(ref);
3202 // PhantomReference has its own implementation of get().
3203 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3204 oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3205 return JNIHandles::make_local(THREAD, referent);
3206 JVM_END
3207
3208 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3209 oop ref_oop = JNIHandles::resolve_non_null(ref);
3210 // PhantomReference has its own implementation of refersTo().
3211 // See: JVM_PhantomReferenceRefersTo
3212 assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3213 oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3214 return referent == JNIHandles::resolve(o);
3215 JVM_END
3216
3217 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3218 oop ref_oop = JNIHandles::resolve_non_null(ref);
3219 // FinalReference has it's own implementation of clear().
3220 assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3221 if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3222 // If the referent has already been cleared then done.
3223 // However, if the referent is dead but has not yet been cleared by
3224 // concurrent reference processing, it should NOT be cleared here.
3225 // Instead, clearing should be left to the GC. Clearing it here could
3226 // detectably lose an expected notification, which is impossible with
3227 // STW reference processing. The clearing in enqueue() doesn't have
3228 // this problem, since the enqueue covers the notification, but it's not
3229 // worth the effort to handle that case specially.
3230 return;
3231 }
3232 java_lang_ref_Reference::clear_referent(ref_oop);
3233 JVM_END
3234
3235
3236 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3237
3238
3239 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3240 oop ref_oop = JNIHandles::resolve_non_null(ref);
3241 oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3242 return referent == JNIHandles::resolve(o);
3243 JVM_END
3244
3245
3246 // ObjectInputStream ///////////////////////////////////////////////////////////////
3247
3248 // Return the first user-defined class loader up the execution stack, or null
3249 // if only code from the bootstrap or platform class loader is on the stack.
3250
3251 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3252 for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3253 InstanceKlass* ik = vfst.method()->method_holder();
3254 oop loader = ik->class_loader();
3255 if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3256 return JNIHandles::make_local(THREAD, loader);
3257 }
3258 }
3259 return nullptr;
3260 JVM_END
3261
3262
3263 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3264
3265
3266 // resolve array handle and check arguments
3267 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3268 if (arr == nullptr) {
3269 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3270 }
3271 oop a = JNIHandles::resolve_non_null(arr);
3272 if (!a->is_array()) {
3273 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3274 } else if (type_array_only && !a->is_typeArray()) {
3275 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3276 }
3277 return arrayOop(a);
3278 }
3279
3280
3281 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3282 arrayOop a = check_array(env, arr, false, CHECK_0);
3283 return a->length();
3284 JVM_END
3285
3286
3287 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3288 JvmtiVMObjectAllocEventCollector oam;
3289 arrayOop a = check_array(env, arr, false, CHECK_NULL);
3290 jvalue value;
3291 BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3292 oop box = Reflection::box(&value, type, CHECK_NULL);
3293 return JNIHandles::make_local(THREAD, box);
3294 JVM_END
3295
3296
3297 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3298 jvalue value;
3299 value.i = 0; // to initialize value before getting used in CHECK
3300 arrayOop a = check_array(env, arr, true, CHECK_(value));
3301 assert(a->is_typeArray(), "just checking");
3302 BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3303 BasicType wide_type = (BasicType) wCode;
3304 if (type != wide_type) {
3305 Reflection::widen(&value, type, wide_type, CHECK_(value));
3306 }
3307 return value;
3308 JVM_END
3309
3310
3311 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3312 arrayOop a = check_array(env, arr, false, CHECK);
3313 oop box = JNIHandles::resolve(val);
3314 jvalue value;
3315 value.i = 0; // to initialize value before getting used in CHECK
3316 BasicType value_type;
3317 if (a->is_objArray()) {
3318 // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3319 value_type = Reflection::unbox_for_regular_object(box, &value);
3320 } else {
3321 value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3322 }
3323 Reflection::array_set(&value, a, index, value_type, CHECK);
3324 JVM_END
3325
3326
3327 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3328 arrayOop a = check_array(env, arr, true, CHECK);
3329 assert(a->is_typeArray(), "just checking");
3330 BasicType value_type = (BasicType) vCode;
3331 Reflection::array_set(&v, a, index, value_type, CHECK);
3332 JVM_END
3333
3334
3335 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3336 JvmtiVMObjectAllocEventCollector oam;
3337 oop element_mirror = JNIHandles::resolve(eltClass);
3338 oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3339 return JNIHandles::make_local(THREAD, result);
3340 JVM_END
3341
3342
3343 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3344 JvmtiVMObjectAllocEventCollector oam;
3345 arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3346 oop element_mirror = JNIHandles::resolve(eltClass);
3347 assert(dim_array->is_typeArray(), "just checking");
3348 oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3349 return JNIHandles::make_local(THREAD, result);
3350 JVM_END
3351
3352
3353 // Library support ///////////////////////////////////////////////////////////////////////////
3354
3355 JVM_LEAF(void*, JVM_LoadZipLibrary())
3356 return ZipLibrary::handle();
3357 JVM_END
3358
3359 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3360 //%note jvm_ct
3361 char ebuf[1024];
3362 void *load_result;
3363 {
3364 ThreadToNativeFromVM ttnfvm(thread);
3365 load_result = os::dll_load(name, ebuf, sizeof ebuf);
3366 }
3367 if (load_result == nullptr) {
3368 if (throwException) {
3369 char msg[1024];
3370 jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3371 // Since 'ebuf' may contain a string encoded using
3372 // platform encoding scheme, we need to pass
3373 // Exceptions::unsafe_to_utf8 to the new_exception method
3374 // as the last argument. See bug 6367357.
3375 Handle h_exception =
3376 Exceptions::new_exception(thread,
3377 vmSymbols::java_lang_UnsatisfiedLinkError(),
3378 msg, Exceptions::unsafe_to_utf8);
3379
3380 THROW_HANDLE_NULL(h_exception);
3381 } else {
3382 log_info(library)("Failed to load library %s", name);
3383 return load_result;
3384 }
3385 }
3386 log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3387 return load_result;
3388 JVM_END
3389
3390
3391 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3392 os::dll_unload(handle);
3393 log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3394 JVM_END
3395
3396
3397 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3398 void* find_result = os::dll_lookup(handle, name);
3399 log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3400 find_result != nullptr ? "Found" : "Failed to find",
3401 name, p2i(handle));
3402 return find_result;
3403 JVM_END
3404
3405
3406 // JNI version ///////////////////////////////////////////////////////////////////////////////
3407
3408 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3409 return Threads::is_supported_jni_version_including_1_1(version);
3410 JVM_END
3411
3412
3413 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3414 return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3415 JVM_END
3416
3417 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3418 return VMContinuations ? JNI_TRUE : JNI_FALSE;
3419 JVM_END
3420
3421 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3422 return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3423 JVM_END
3424
3425 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3426 return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3427 JVM_END
3428
3429 // String support ///////////////////////////////////////////////////////////////////////////
3430
3431 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3432 JvmtiVMObjectAllocEventCollector oam;
3433 if (str == nullptr) return nullptr;
3434 oop string = JNIHandles::resolve_non_null(str);
3435 oop result = StringTable::intern(string, CHECK_NULL);
3436 return (jstring) JNIHandles::make_local(THREAD, result);
3437 JVM_END
3438
3439
3440 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3441
3442 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3443 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3444 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3445 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3446 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3447 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3448
3449
3450 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3451 VM_Exit::block_if_vm_exited();
3452 return new PlatformMutex();
3453 }
3454
3455
3456 JNIEXPORT void JNICALL JVM_RawMonitorDestroy(void *mon) {
3457 VM_Exit::block_if_vm_exited();
3458 delete ((PlatformMutex*) mon);
3459 }
3460
3461
3462 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3463 VM_Exit::block_if_vm_exited();
3464 ((PlatformMutex*) mon)->lock();
3465 return 0;
3466 }
3467
3468
3469 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3470 VM_Exit::block_if_vm_exited();
3471 ((PlatformMutex*) mon)->unlock();
3472 }
3473
3474
3475 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3476
3477 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3478 Handle loader, jboolean throwError, TRAPS) {
3479 Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3480
3481 // Check if we should initialize the class
3482 if (init && klass->is_instance_klass()) {
3483 klass->initialize(CHECK_NULL);
3484 }
3485 return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3486 }
3487
3488
3489 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3490
3491 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3492 Handle method_handle;
3493 if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3494 method_handle = Handle(THREAD, JNIHandles::resolve(method));
3495 Handle receiver(THREAD, JNIHandles::resolve(obj));
3496 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3497 assert(args() == nullptr || !args->is_flatArray(), "args are never flat");
3498
3499 oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3500 jobject res = JNIHandles::make_local(THREAD, result);
3501 if (JvmtiExport::should_post_vm_object_alloc()) {
3502 oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3503 assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3504 if (java_lang_Class::is_primitive(ret_type)) {
3505 // Only for primitive type vm allocates memory for java object.
3506 // See box() method.
3507 JvmtiExport::post_vm_object_alloc(thread, result);
3508 }
3509 }
3510 return res;
3511 } else {
3512 THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3513 }
3514 JVM_END
3515
3516
3517 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3518 objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3519 assert(args() == nullptr || !args->is_flatArray(), "args are never flat");
3520 oop constructor_mirror = JNIHandles::resolve(c);
3521 oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3522 jobject res = JNIHandles::make_local(THREAD, result);
3523 if (JvmtiExport::should_post_vm_object_alloc()) {
3524 JvmtiExport::post_vm_object_alloc(thread, result);
3525 }
3526 return res;
3527 JVM_END
3528
3529 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3530 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3531 HeapShared::initialize_from_archived_subgraph(THREAD, k);
3532 JVM_END
3533
3534 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3535 jclass caller,
3536 jstring interfaceMethodName,
3537 jobject factoryType,
3538 jobject interfaceMethodType,
3539 jobject implementationMember,
3540 jobject dynamicMethodType,
3541 jclass lambdaProxyClass))
3542 #if INCLUDE_CDS
3543 if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3544 return;
3545 }
3546
3547 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3548 if (caller_ik->is_hidden()) {
3549 // Hidden classes not of type lambda proxy classes are currently not being archived.
3550 // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3551 // registered for archiving.
3552 return;
3553 }
3554 InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3555 assert(lambda_ik->is_hidden(), "must be a hidden class");
3556 assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3557
3558 Symbol* interface_method_name = nullptr;
3559 if (interfaceMethodName != nullptr) {
3560 interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3561 }
3562 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3563 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3564
3565 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3566 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3567
3568 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3569 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3570 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3571
3572 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3573 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3574
3575 LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3576 interface_method_type, m, dynamic_method_type, THREAD);
3577 #endif // INCLUDE_CDS
3578 JVM_END
3579
3580 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3581 jclass caller,
3582 jstring interfaceMethodName,
3583 jobject factoryType,
3584 jobject interfaceMethodType,
3585 jobject implementationMember,
3586 jobject dynamicMethodType))
3587 #if INCLUDE_CDS
3588
3589 if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3590 implementationMember == nullptr || dynamicMethodType == nullptr) {
3591 THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3592 }
3593
3594 InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3595 if (!caller_ik->in_aot_cache()) {
3596 // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3597 return nullptr;
3598 }
3599
3600 Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3601 Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3602 Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3603
3604 Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3605 Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3606
3607 Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3608 assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3609 Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3610
3611 Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3612 Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3613
3614 InstanceKlass* loaded_lambda =
3615 LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3616 interface_method_type, m, dynamic_method_type,
3617 CHECK_(nullptr));
3618 return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3619 #else
3620 return nullptr;
3621 #endif // INCLUDE_CDS
3622 JVM_END
3623
3624 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3625 if (CDSConfig::is_dumping_static_archive()) {
3626 // We do this so that the default CDS archive can be deterministic.
3627 const char* release = VM_Version::vm_release();
3628 const char* dbg_level = VM_Version::jdk_debug_level();
3629 const char* version = VM_Version::internal_vm_info_string();
3630 jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3631 java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3632 java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3633 seed += (jlong)VM_Version::vm_major_version();
3634 seed += (jlong)VM_Version::vm_minor_version();
3635 seed += (jlong)VM_Version::vm_security_version();
3636 seed += (jlong)VM_Version::vm_patch_version();
3637 if (seed == 0) { // don't let this ever be zero.
3638 seed = 0x87654321;
3639 }
3640 log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3641 return seed;
3642 } else {
3643 return 0;
3644 }
3645 JVM_END
3646
3647 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3648 return CDSConfig::get_status();
3649 JVM_END
3650
3651 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3652 #if INCLUDE_CDS
3653 assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3654 if (line != nullptr) {
3655 ResourceMark rm(THREAD);
3656 Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3657 char* c_line = java_lang_String::as_utf8_string(h_line());
3658 if (CDSConfig::is_dumping_dynamic_archive()) {
3659 // Note: LambdaFormInvokers::append take same format which is not
3660 // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3661 LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3662 }
3663 if (ClassListWriter::is_enabled()) {
3664 ClassListWriter w;
3665 w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3666 }
3667 }
3668 #endif // INCLUDE_CDS
3669 JVM_END
3670
3671 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3672 #if INCLUDE_CDS
3673 ResourceMark rm(THREAD);
3674 Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3675 char* file_name = java_lang_String::as_utf8_string(file_handle());
3676 AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3677 #endif // INCLUDE_CDS
3678 JVM_END
3679
3680 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3681 #if INCLUDE_CDS
3682 ResourceMark rm(THREAD);
3683 Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3684 char* archive_name = java_lang_String::as_utf8_string(file_handle());
3685 DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3686 #endif // INCLUDE_CDS
3687 JVM_END
3688
3689 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3690 #if INCLUDE_CDS
3691 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3692 if (!k->is_instance_klass()) {
3693 return false;
3694 } else {
3695 if (InstanceKlass::cast(k)->is_enum_subclass() ||
3696 AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3697 // This class will be cached in AOT-initialized state. No need for init barriers.
3698 return false;
3699 } else {
3700 // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3701 // must emit barriers to ensure class initialization during production run.
3702 ResourceMark rm(THREAD);
3703 log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3704 return true;
3705 }
3706 }
3707 #else
3708 return false;
3709 #endif // INCLUDE_CDS
3710 JVM_END
3711
3712 // Returns an array of all live Thread objects (VM internal JavaThreads,
3713 // jvmti agent threads, and JNI attaching threads are skipped)
3714 // See CR 6404306 regarding JNI attaching threads
3715 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3716 ResourceMark rm(THREAD);
3717 ThreadsListEnumerator tle(THREAD, false, false);
3718 JvmtiVMObjectAllocEventCollector oam;
3719
3720 int num_threads = tle.num_threads();
3721 objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3722 objArrayHandle threads_ah(THREAD, r);
3723
3724 for (int i = 0; i < num_threads; i++) {
3725 Handle h = tle.get_threadObj(i);
3726 threads_ah->obj_at_put(i, h());
3727 }
3728
3729 return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3730 JVM_END
3731
3732
3733 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3734 // Return StackTraceElement[][], each element is the stack trace of a thread in
3735 // the corresponding entry in the given threads array
3736 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3737 JvmtiVMObjectAllocEventCollector oam;
3738
3739 // Check if threads is null
3740 if (threads == nullptr) {
3741 THROW_NULL(vmSymbols::java_lang_NullPointerException());
3742 }
3743
3744 refArrayOop a = oop_cast<refArrayOop>(JNIHandles::resolve_non_null(threads));
3745 refArrayHandle ah(THREAD, a);
3746 int num_threads = ah->length();
3747 // check if threads is non-empty array
3748 if (num_threads == 0) {
3749 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3750 }
3751
3752 // check if threads is not an array of objects of Thread class
3753 Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3754 if (k != vmClasses::Thread_klass()) {
3755 THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3756 }
3757
3758 ResourceMark rm(THREAD);
3759
3760 GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3761 for (int i = 0; i < num_threads; i++) {
3762 oop thread_obj = ah->obj_at(i);
3763 instanceHandle h(THREAD, (instanceOop) thread_obj);
3764 thread_handle_array->append(h);
3765 }
3766
3767 // The JavaThread references in thread_handle_array are validated
3768 // in VM_ThreadDump::doit().
3769 Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3770 return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3771
3772 JVM_END
3773
3774 // JVM monitoring and management support
3775 JVM_LEAF(void*, JVM_GetManagement(jint version))
3776 return Management::get_jmm_interface(version);
3777 JVM_END
3778
3779 // com.sun.tools.attach.VirtualMachine agent properties support
3780 //
3781 // Initialize the agent properties with the properties maintained in the VM
3782 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3783 ResourceMark rm;
3784
3785 Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3786
3787 PUTPROP(props, "sun.java.command", Arguments::java_command());
3788 PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3789 PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3790 return properties;
3791 JVM_END
3792
3793 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3794 {
3795 JvmtiVMObjectAllocEventCollector oam;
3796
3797 if (ofClass == nullptr) {
3798 return nullptr;
3799 }
3800 Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3801 // Special handling for primitive objects
3802 if (java_lang_Class::is_primitive(mirror())) {
3803 return nullptr;
3804 }
3805 Klass* k = java_lang_Class::as_Klass(mirror());
3806 if (!k->is_instance_klass()) {
3807 return nullptr;
3808 }
3809 InstanceKlass* ik = InstanceKlass::cast(k);
3810 int encl_method_class_idx = ik->enclosing_method_class_index();
3811 if (encl_method_class_idx == 0) {
3812 return nullptr;
3813 }
3814 objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3815 objArrayHandle dest(THREAD, dest_o);
3816 Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3817 dest->obj_at_put(0, enc_k->java_mirror());
3818 int encl_method_method_idx = ik->enclosing_method_method_index();
3819 if (encl_method_method_idx != 0) {
3820 Symbol* sym = ik->constants()->symbol_at(
3821 extract_low_short_from_int(
3822 ik->constants()->name_and_type_at(encl_method_method_idx)));
3823 Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3824 dest->obj_at_put(1, str());
3825 sym = ik->constants()->symbol_at(
3826 extract_high_short_from_int(
3827 ik->constants()->name_and_type_at(encl_method_method_idx)));
3828 str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3829 dest->obj_at_put(2, str());
3830 }
3831 return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3832 }
3833 JVM_END
3834
3835 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3836 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3837 ResourceMark rm(THREAD);
3838
3839 if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3840 return nullptr;
3841 }
3842
3843 char** vm_flags = Arguments::jvm_flags_array();
3844 char** vm_args = Arguments::jvm_args_array();
3845 int num_flags = Arguments::num_jvm_flags();
3846 int num_args = Arguments::num_jvm_args();
3847
3848 InstanceKlass* ik = vmClasses::String_klass();
3849 objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3850 objArrayHandle result_h(THREAD, r);
3851
3852 int index = 0;
3853 for (int j = 0; j < num_flags; j++, index++) {
3854 stringStream prefixed;
3855 prefixed.print("-XX:%s", vm_flags[j]);
3856 Handle h = java_lang_String::create_from_platform_dependent_str(prefixed.base(), CHECK_NULL);
3857 result_h->obj_at_put(index, h());
3858 }
3859 for (int i = 0; i < num_args; i++, index++) {
3860 Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3861 result_h->obj_at_put(index, h());
3862 }
3863 return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3864 JVM_END
3865
3866 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3867 return os::get_signal_number(name);
3868 JVM_END
3869
3870 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread))
3871 oop vt = JNIHandles::resolve_external_guard(vthread);
3872 MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/);
3873 JVM_END
3874
3875 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread))
3876 oop vt = JNIHandles::resolve_external_guard(vthread);
3877 MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/);
3878 JVM_END
3879
3880 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3881 oop vt = JNIHandles::resolve_external_guard(vthread);
3882 MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/);
3883 JVM_END
3884
3885 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3886 oop vt = JNIHandles::resolve_external_guard(vthread);
3887 MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/);
3888 JVM_END
3889
3890 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3891 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3892 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3893 #if INCLUDE_JVMTI
3894 if (!DoJVMTIVirtualThreadTransitions) {
3895 assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3896 return;
3897 }
3898 assert(thread->is_disable_suspend() != (bool)enter,
3899 "nested or unbalanced monitor enter/exit is not allowed");
3900 thread->toggle_is_disable_suspend();
3901 #endif
3902 JVM_END
3903
3904 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3905 #if INCLUDE_JFR
3906 freeze_result result = THREAD->last_freeze_fail_result();
3907 assert(result != freeze_ok, "sanity check");
3908 EventVirtualThreadPinned event(UNTIMED);
3909 event.set_starttime(THREAD->last_freeze_fail_time());
3910 if (event.should_commit()) {
3911 ResourceMark rm(THREAD);
3912 const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3913 THREAD->post_vthread_pinned_event(&event, str, result);
3914 }
3915 #endif
3916 JVM_END
3917
3918 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3919 ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3920 assert(parkEvent != nullptr, "not initialized");
3921
3922 OopHandle& list_head = ObjectMonitor::vthread_list_head();
3923 oop vthread_head = nullptr;
3924 while (true) {
3925 if (list_head.peek() != nullptr) {
3926 for (;;) {
3927 oop head = list_head.resolve();
3928 if (list_head.cmpxchg(head, nullptr) == head) {
3929 return JNIHandles::make_local(THREAD, head);
3930 }
3931 }
3932 }
3933 ThreadBlockInVM tbivm(THREAD);
3934 parkEvent->park();
3935 }
3936 JVM_END
3937
3938 /*
3939 * Return the current class's class file version. The low order 16 bits of the
3940 * returned jint contain the class's major version. The high order 16 bits
3941 * contain the class's minor version.
3942 */
3943 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3944 oop mirror = JNIHandles::resolve_non_null(current);
3945 if (java_lang_Class::is_primitive(mirror)) {
3946 // return latest major version and minor version of 0.
3947 return JVM_CLASSFILE_MAJOR_VERSION;
3948 }
3949 InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3950 return (ik->minor_version() << 16) | ik->major_version();
3951 JVM_END
3952
3953 /*
3954 * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3955 * get the value will see a materialized value and not a scalar-replaced
3956 * null value.
3957 */
3958 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3959 JVM_EnsureMaterializedForStackWalk(env, value);
3960 JVM_END
3961
3962 /*
3963 * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3964 */
3965 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3966 return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3967 JVM_END