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 #elif INCLUDE_JVMCI
 397     #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
 398 #else
 399     const char* compiler_name = "";
 400 #endif // compilers
 401 #endif // COMPILER1_AND_COMPILER2
 402 
 403     if (*compiler_name != '\0' &&
 404         (Arguments::mode() != Arguments::_int)) {
 405       Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
 406       Handle value_str  = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
 407       result_h->obj_at_put(ndx * 2,  key_str());
 408       result_h->obj_at_put(ndx * 2 + 1, value_str());
 409       ndx++;
 410     }
 411   }
 412 
 413   return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
 414 JVM_END
 415 
 416 
 417 /*
 418  * Return the temporary directory that the VM uses for the attach
 419  * and perf data files.
 420  *
 421  * It is important that this directory is well-known and the
 422  * same for all VM instances. It cannot be affected by configuration
 423  * variables such as java.io.tmpdir.
 424  */
 425 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
 426   HandleMark hm(THREAD);
 427   const char* temp_dir = os::get_temp_directory();
 428   Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
 429   return (jstring) JNIHandles::make_local(THREAD, h());
 430 JVM_END
 431 
 432 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
 433   if (len < 0) {
 434     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
 435   }
 436   elmClass->initialize(CHECK);
 437   if (elmClass->is_array_klass() || elmClass->is_identity_class()) {
 438     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
 439   }
 440   if (elmClass->is_abstract()) {
 441     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
 442   }
 443 }
 444 
 445 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
 446   oop o = JNIHandles::resolve_non_null(orig);
 447   assert(o->is_array(), "Must be");
 448   oop array = nullptr;
 449   arrayOop org = (arrayOop)o;
 450   arrayHandle oh(THREAD, org);
 451   ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass());
 452   InlineKlass* vk = InlineKlass::cast(ak->element_klass());
 453   int len = to - from;  // length of the new array
 454   if (ak->is_null_free_array_klass()) {
 455     if ((len != 0) && (from >= org->length() || to > org->length())) {
 456       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
 457     }
 458   }
 459   if (ak->is_flatArray_klass()) {
 460     // The whole JVM_CopyOfSpecialArray is currently broken. Fix this in a separate bugfix.
 461     int org_length = org->length();
 462     int copy_len = MIN2(to, org_length) - MIN2(from, org_length);
 463     FlatArrayKlass* const fak = FlatArrayKlass::cast(org->klass());
 464     flatArrayOop dst = oopFactory::new_flatArray(fak, len, CHECK_NULL);
 465     assert(!ak->is_null_free_array_klass() || copy_len == len,
 466            "Failed to throw the IllegalArgumentException");
 467     if (copy_len != 0) {
 468       int start = MIN2(from, org_length - 1);
 469       FlatArrayPayload src_payload(flatArrayOop(oh()), start, fak);
 470       FlatArrayPayload dst_payload(dst, 0, fak);
 471       int end = to < oh()->length() ? to : oh()->length();
 472       for (int i = from; i < end; i++) {
 473         // Copy a value
 474         src_payload.copy_to(dst_payload);
 475 
 476         // Advance to the next element
 477         src_payload.next_element();
 478         dst_payload.next_element();
 479       }
 480     }
 481     array = dst;
 482   } else {
 483     const ArrayProperties props = ArrayProperties::Default().with_null_restricted(ak->is_null_free_array_klass());
 484 
 485     array = oopFactory::new_objArray(vk, len, props,  CHECK_NULL);
 486     int end = to < oh()->length() ? to : oh()->length();
 487     for (int i = from; i < end; i++) {
 488       if (i < ((objArrayOop)oh())->length()) {
 489         oop val = ((objArrayOop)oh())->obj_at(i, CHECK_NULL);
 490         ((objArrayOop)array)->obj_at_put(i - from, val);
 491       } else {
 492         assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
 493         ((objArrayOop)array)->obj_at_put(i - from, nullptr);
 494       }
 495     }
 496   }
 497   return (jarray) JNIHandles::make_local(THREAD, array);
 498 JVM_END
 499 
 500 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
 501   oop mirror = JNIHandles::resolve_non_null(elmClass);
 502   oop init = JNIHandles::resolve(initVal);
 503   if (init == nullptr) {
 504     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
 505   }
 506   Handle init_h(THREAD, init);
 507   Klass* klass = java_lang_Class::as_Klass(mirror);
 508   if (klass != init_h()->klass()) {
 509     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
 510   }
 511   validate_array_arguments(klass, len, CHECK_NULL);
 512   const ArrayProperties props = ArrayProperties::Default()
 513     .with_null_restricted()
 514     .with_non_atomic();
 515 
 516   objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
 517   for (int i = 0; i < len; i++) {
 518     array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
 519   }
 520   return (jarray) JNIHandles::make_local(THREAD, array);
 521 JVM_END
 522 
 523 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
 524   oop mirror = JNIHandles::resolve_non_null(elmClass);
 525   oop init = JNIHandles::resolve(initVal);
 526   if (init == nullptr) {
 527     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
 528   }
 529   Handle init_h(THREAD, init);
 530   Klass* klass = java_lang_Class::as_Klass(mirror);
 531   if (klass != init_h()->klass()) {
 532     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
 533   }
 534   validate_array_arguments(klass, len, CHECK_NULL);
 535   const ArrayProperties props = ArrayProperties::Default().with_null_restricted();
 536   objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
 537   for (int i = 0; i < len; i++) {
 538     array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
 539   }
 540   return (jarray) JNIHandles::make_local(THREAD, array);
 541 JVM_END
 542 
 543 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
 544   oop mirror = JNIHandles::resolve_non_null(elmClass);
 545   Klass* klass = java_lang_Class::as_Klass(mirror);
 546   klass->initialize(CHECK_NULL);
 547   validate_array_arguments(klass, len, CHECK_NULL);
 548   objArrayOop array = oopFactory::new_objArray(klass, len, ArrayProperties::Default(), CHECK_NULL);
 549   return (jarray) JNIHandles::make_local(THREAD, array);
 550 JVM_END
 551 
 552 JVM_ENTRY(jarray, JVM_NewReferenceArray(JNIEnv *env, jclass elmClass, jint len))
 553   oop mirror = JNIHandles::resolve_non_null(elmClass);
 554   Klass* klass = java_lang_Class::as_Klass(mirror);
 555   validate_array_arguments(klass, len, CHECK_NULL);
 556   refArrayOop array = oopFactory::new_refArray(klass, len, ArrayProperties::Default(), CHECK_NULL);
 557   return (jarray) JNIHandles::make_local(THREAD, array);
 558 JVM_END
 559 
 560 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jarray array))
 561   oop o = JNIHandles::resolve_non_null(array);
 562   Klass* klass = o->klass();
 563 
 564   return klass->is_flatArray_klass();
 565 JVM_END
 566 
 567 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jarray array))
 568   oop o = JNIHandles::resolve_non_null(array);
 569   Klass* klass = o->klass();
 570 
 571   assert(klass->is_objArray_klass(), "Expects an object array");
 572 
 573   return klass->is_null_free_array_klass();
 574 JVM_END
 575 
 576 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jarray array))
 577   // There are multiple cases where an array can/must support atomic access:
 578   //   - the array is a reference array
 579   //   - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or NULL_FREE_ATOMIC_FLAT
 580   //   - the array is flat and its component type is naturally atomic
 581   oop o = JNIHandles::resolve_non_null(array);
 582   Klass* klass = o->klass();
 583 
 584   assert(klass->is_objArray_klass(), "Expects an object array");
 585 
 586   if (klass->is_refArray_klass()) {
 587     return true;
 588   }
 589 
 590   if (klass->is_flatArray_klass()) {
 591     FlatArrayKlass* fak = FlatArrayKlass::cast(klass);
 592     if (LayoutKindHelper::is_atomic_flat(fak->layout_kind())) {
 593       return true;
 594     }
 595     if (fak->element_klass()->is_naturally_atomic()) {
 596       return true;
 597     }
 598 
 599     return false;
 600   }
 601 
 602   ShouldNotReachHere();
 603 JVM_END
 604 
 605 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
 606 
 607 extern volatile jint vm_created;
 608 
 609 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
 610   EventShutdown event;
 611   if (event.should_commit()) {
 612     event.set_reason("Shutdown requested from Java");
 613     event.commit();
 614   }
 615 JVM_END
 616 
 617 
 618 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
 619   before_exit(thread, true);
 620   vm_exit(code);
 621 JVM_END
 622 
 623 
 624 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
 625   if (!DisableExplicitGC) {
 626     EventSystemGC event;
 627     event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
 628     Universe::heap()->collect(GCCause::_java_lang_system_gc);
 629     event.commit();
 630   }
 631 JVM_END
 632 
 633 
 634 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
 635   return Universe::heap()->millis_since_last_whole_heap_examined();
 636 JVM_END
 637 
 638 
 639 static inline jlong convert_size_t_to_jlong(size_t val) {
 640   // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
 641   NOT_LP64 (return (jlong)val;)
 642   LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
 643 }
 644 
 645 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
 646   size_t n = Universe::heap()->capacity();
 647   return convert_size_t_to_jlong(n);
 648 JVM_END
 649 
 650 
 651 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
 652   size_t n = Universe::heap()->unused();
 653   return convert_size_t_to_jlong(n);
 654 JVM_END
 655 
 656 
 657 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
 658   size_t n = Universe::heap()->max_capacity();
 659   return convert_size_t_to_jlong(n);
 660 JVM_END
 661 
 662 
 663 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
 664   return os::active_processor_count();
 665 JVM_END
 666 
 667 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
 668 #ifdef LINUX
 669   if (UseContainerSupport) {
 670     return JNI_TRUE;
 671   }
 672 #endif
 673   return JNI_FALSE;
 674 JVM_END
 675 
 676 JVM_LEAF(jboolean, JVM_IsContainerized(void))
 677   if (os::is_containerized()) {
 678     return JNI_TRUE;
 679   }
 680   return JNI_FALSE;
 681 JVM_END
 682 
 683 // java.lang.Throwable //////////////////////////////////////////////////////
 684 
 685 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
 686   Handle exception(thread, JNIHandles::resolve_non_null(receiver));
 687   java_lang_Throwable::fill_in_stack_trace(exception);
 688 JVM_END
 689 
 690 // java.lang.NullPointerException ///////////////////////////////////////////
 691 
 692 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
 693   if (!ShowCodeDetailsInExceptionMessages) return nullptr;
 694 
 695   oop exc = JNIHandles::resolve_non_null(throwable);
 696 
 697   Method* method;
 698   int bci;
 699   if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
 700     return nullptr;
 701   }
 702   if (method->is_native()) {
 703     return nullptr;
 704   }
 705 
 706   stringStream ss;
 707   bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
 708   if (ok) {
 709     oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
 710     return (jstring) JNIHandles::make_local(THREAD, result);
 711   } else {
 712     return nullptr;
 713   }
 714 JVM_END
 715 
 716 // java.lang.StackTraceElement //////////////////////////////////////////////
 717 
 718 
 719 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
 720   Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
 721   refArrayOop st = refArrayOop(JNIHandles::resolve(elements));
 722   refArrayHandle stack_trace(THREAD, st);
 723   // Fill in the allocated stack trace
 724   java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
 725 JVM_END
 726 
 727 
 728 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
 729   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
 730   Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
 731   java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
 732 JVM_END
 733 
 734 
 735 // java.lang.StackWalker //////////////////////////////////////////////////////
 736 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
 737   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
 738 
 739   bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
 740   bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
 741   Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
 742   if (!have_name) {
 743     oop name = StringTable::intern(method->name(), CHECK);
 744     java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
 745   }
 746   if (!have_type) {
 747     Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
 748     java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
 749   }
 750 JVM_END
 751 
 752 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
 753                                      jint skip_frames, jobject contScope, jobject cont,
 754                                      jint buffer_size, jint start_index, jobjectArray frames))
 755   if (!thread->has_last_Java_frame()) {
 756     THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
 757   }
 758 
 759   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 760   Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
 761   Handle cont_h(THREAD, JNIHandles::resolve(cont));
 762   // frames array is a ClassFrameInfo[] array when only getting caller reference,
 763   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 764   // be null.
 765   refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames));
 766   refArrayHandle frames_array_h(THREAD, fa);
 767 
 768   if (frames_array_h->length() < buffer_size) {
 769     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
 770   }
 771 
 772   oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
 773                                buffer_size, start_index, frames_array_h, CHECK_NULL);
 774   return JNIHandles::make_local(THREAD, result);
 775 JVM_END
 776 
 777 
 778 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
 779                                   jint last_batch_count, jint buffer_size, jint start_index,
 780                                   jobjectArray frames))
 781   // frames array is a ClassFrameInfo[] array when only getting caller reference,
 782   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 783   // be null.
 784   refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames));
 785   refArrayHandle frames_array_h(THREAD, fa);
 786 
 787   if (frames_array_h->length() < buffer_size) {
 788     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
 789   }
 790 
 791   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 792   return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
 793                                   start_index, frames_array_h, THREAD);
 794 JVM_END
 795 
 796 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
 797   refArrayOop fa = refArrayOop(JNIHandles::resolve_non_null(frames));
 798   refArrayHandle frames_array_h(THREAD, fa);
 799   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 800   Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
 801 
 802   StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
 803 JVM_END
 804 
 805 // java.lang.Object ///////////////////////////////////////////////
 806 
 807 
 808 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
 809   // as implemented in the classic virtual machine; return 0 if object is null
 810   if (handle == nullptr) {
 811     return 0;
 812   }
 813   oop obj = JNIHandles::resolve_non_null(handle);
 814   if (Arguments::is_valhalla_enabled() && obj->klass()->is_inline_klass()) {
 815     const intptr_t obj_identity_hash = obj->mark().hash();
 816     // Check if mark word contains hash code already.
 817     // It is possible that the generated identity hash is 0, which is not
 818     // distinct from the no_hash value. In such a case, the hash will be
 819     // computed and set every time JVM_IHashCode is called. If that happens,
 820     // the only consequence is losing out on the optimization.
 821     if (obj_identity_hash != markWord::no_hash) {
 822       return checked_cast<jint>(obj_identity_hash);
 823     }
 824 
 825     // Compute hash by calling ValueObjectMethods.valueObjectHashCode.
 826     // The identity hash is invariantly immutable (see its JavaDoc comment).
 827     JavaValue result(T_INT);
 828     JavaCallArguments args;
 829     Handle ho(THREAD, obj);
 830     args.push_oop(ho);
 831     methodHandle method(THREAD, Universe::value_object_hash_code_method());
 832     JavaCalls::call(&result, method, &args, THREAD);
 833     if (HAS_PENDING_EXCEPTION) {
 834       if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
 835         Handle e(THREAD, PENDING_EXCEPTION);
 836         CLEAR_PENDING_EXCEPTION;
 837         THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
 838       }
 839     }
 840     const intptr_t identity_hash = result.get_jint();
 841 
 842     // We now have to set the hash via CAS. It's possible that this will race
 843     // other threads. By our invariant of immutability, when there is a
 844     // race, the identity hash code is going to be one of the following:
 845     // a) 0, another thread updated other markWord bits; b) identity_hash set
 846     // by another thread; or c) identity_hash set by the current thread.
 847     // A nonzero identity hash code that is not the identity_hash computed
 848     // earlier indicates a violation of the invariant.
 849     markWord current_mark, old_mark, new_mark;
 850     do {
 851       current_mark = ho->mark();
 852       new_mark = current_mark.copy_set_hash(identity_hash);
 853       old_mark = ho->cas_set_mark(new_mark, current_mark);
 854       assert(old_mark.has_no_hash() || old_mark.hash() == new_mark.hash(),
 855             "CAS identity hash invariant violated, expected=" INTPTR_FORMAT " actual=" INTPTR_FORMAT,
 856             new_mark.hash(),
 857             old_mark.hash());
 858     } while (old_mark != current_mark);
 859 
 860     return checked_cast<jint>(new_mark.hash());
 861   } else {
 862     return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
 863   }
 864 JVM_END
 865 
 866 
 867 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
 868   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 869   ObjectSynchronizer::wait(obj, ms, CHECK);
 870 JVM_END
 871 
 872 
 873 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
 874   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 875   ObjectSynchronizer::notify(obj, CHECK);
 876 JVM_END
 877 
 878 
 879 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
 880   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 881   ObjectSynchronizer::notifyall(obj, CHECK);
 882 JVM_END
 883 
 884 
 885 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
 886   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 887   Klass* klass = obj->klass();
 888   JvmtiVMObjectAllocEventCollector oam;
 889 
 890 #ifdef ASSERT
 891   // Just checking that the cloneable flag is set correct
 892   if (obj->is_array()) {
 893     guarantee(klass->is_cloneable(), "all arrays are cloneable");
 894   } else {
 895     guarantee(obj->is_instance(), "should be instanceOop");
 896     bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
 897     guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
 898   }
 899 #endif
 900 
 901   // Check if class of obj supports the Cloneable interface.
 902   // All arrays are considered to be cloneable (See JLS 20.1.5).
 903   // All j.l.r.Reference classes are considered non-cloneable.
 904   if (!klass->is_cloneable() ||
 905       (klass->is_instance_klass() &&
 906        InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
 907     ResourceMark rm(THREAD);
 908     THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
 909   }
 910 
 911   if (klass->is_inline_klass()) {
 912     // Value instances have no identity, so return the current instance instead of allocating a new one
 913     // Value classes cannot have finalizers, so the method can return immediately
 914     return JNIHandles::make_local(THREAD, obj());
 915   }
 916 
 917   // Make shallow object copy
 918   const size_t size = obj->size();
 919   oop new_obj_oop = nullptr;
 920   if (obj->is_array()) {
 921     const int length = ((arrayOop)obj())->length();
 922     new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
 923                                                    /* do_zero */ true, CHECK_NULL);
 924   } else {
 925     new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
 926   }
 927 
 928   HeapAccess<>::clone(obj(), new_obj_oop, size);
 929 
 930   Handle new_obj(THREAD, new_obj_oop);
 931   // Caution: this involves a java upcall, so the clone should be
 932   // "gc-robust" by this stage.
 933   if (klass->has_finalizer()) {
 934     assert(obj->is_instance(), "should be instanceOop");
 935     new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
 936     new_obj = Handle(THREAD, new_obj_oop);
 937   }
 938 
 939   return JNIHandles::make_local(THREAD, new_obj());
 940 JVM_END
 941 
 942 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
 943 
 944 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
 945   MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
 946 JVM_END
 947 
 948 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
 949   return InstanceKlass::is_finalization_enabled();
 950 JVM_END
 951 
 952 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
 953 
 954 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
 955   CONT_RegisterNativeMethods(env, cls);
 956 JVM_END
 957 
 958 // java.io.File ///////////////////////////////////////////////////////////////
 959 
 960 JVM_LEAF(char*, JVM_NativePath(char* path))
 961   return os::native_path(path);
 962 JVM_END
 963 
 964 
 965 // Misc. class handling ///////////////////////////////////////////////////////////
 966 
 967 
 968 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
 969   // Getting the class of the caller frame.
 970   //
 971   // The call stack at this point looks something like this:
 972   //
 973   // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
 974   // [1] [ @CallerSensitive API.method                                   ]
 975   // [.] [ (skipped intermediate frames)                                 ]
 976   // [n] [ caller                                                        ]
 977   vframeStream vfst(thread);
 978   // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
 979   for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
 980     Method* m = vfst.method();
 981     assert(m != nullptr, "sanity");
 982     switch (n) {
 983     case 0:
 984       // This must only be called from Reflection.getCallerClass
 985       if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
 986         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
 987       }
 988       // fall-through
 989     case 1:
 990       // Frame 0 and 1 must be caller sensitive.
 991       if (!m->caller_sensitive()) {
 992         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
 993       }
 994       break;
 995     default:
 996       if (!m->is_ignored_by_security_stack_walk()) {
 997         // We have reached the desired frame; return the holder class.
 998         return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
 999       }
1000       break;
1001     }
1002   }
1003   return nullptr;
1004 JVM_END
1005 
1006 
1007 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
1008   oop mirror = nullptr;
1009   BasicType t = name2type(utf);
1010   if (t != T_ILLEGAL && !is_reference_type(t)) {
1011     mirror = Universe::java_mirror(t);
1012   }
1013   if (mirror == nullptr) {
1014     THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
1015   } else {
1016     return (jclass) JNIHandles::make_local(THREAD, mirror);
1017   }
1018 JVM_END
1019 
1020 
1021 // Returns a class loaded by the bootstrap class loader; or null
1022 // if not found.  ClassNotFoundException is not thrown.
1023 // FindClassFromBootLoader is exported to the launcher for windows.
1024 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
1025                                               const char* name))
1026   // Java libraries should ensure that name is never null or illegal.
1027   if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
1028     // It's impossible to create this class;  the name cannot fit
1029     // into the constant pool.
1030     return nullptr;
1031   }
1032   assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
1033 
1034   TempNewSymbol h_name = SymbolTable::new_symbol(name);
1035   Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
1036   if (k == nullptr) {
1037     return nullptr;
1038   }
1039 
1040   if (log_is_enabled(Debug, class, resolve)) {
1041     trace_class_resolution(k);
1042   }
1043   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1044 JVM_END
1045 
1046 // Find a class with this name in this loader.
1047 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
1048                                           jboolean init, jobject loader))
1049   TempNewSymbol h_name =
1050        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1051                                            CHECK_NULL);
1052 
1053   oop loader_oop = JNIHandles::resolve(loader);
1054   Handle h_loader(THREAD, loader_oop);
1055 
1056   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
1057                                                false, THREAD);
1058 
1059   if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1060     trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
1061   }
1062   return result;
1063 JVM_END
1064 
1065 // Currently only called from the old verifier.
1066 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1067                                          jboolean init, jclass from))
1068   TempNewSymbol h_name =
1069        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1070                                            CHECK_NULL);
1071   oop from_class_oop = JNIHandles::resolve(from);
1072   assert(from_class_oop != nullptr, "must be");
1073   Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
1074   assert(from_class != nullptr, "must be");
1075   oop class_loader = from_class->class_loader();
1076 
1077   Handle h_loader(THREAD, class_loader);
1078   jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1079 
1080   if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1081     // this function is generally only used for class loading during verification.
1082     ResourceMark rm;
1083     const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1084     const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1085     log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1086   }
1087 
1088 #if INCLUDE_CDS
1089   if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1090     InstanceKlass* ik = InstanceKlass::cast(from_class);
1091     SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1092   }
1093 #endif
1094 
1095   return result;
1096 JVM_END
1097 
1098 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1099 static jclass jvm_define_class_common(const char *name,
1100                                       jobject loader, const jbyte *buf,
1101                                       jsize len, jobject pd, const char *source,
1102                                       TRAPS) {
1103   if (source == nullptr)  source = "__JVM_DefineClass__";
1104 
1105   JavaThread* jt = THREAD;
1106 
1107   PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1108                              ClassLoader::perf_define_appclass_selftime(),
1109                              ClassLoader::perf_define_appclasses(),
1110                              jt->get_thread_stat()->perf_recursion_counts_addr(),
1111                              jt->get_thread_stat()->perf_timers_addr(),
1112                              PerfClassTraceTime::DEFINE_CLASS);
1113 
1114   if (UsePerfData) {
1115     ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1116   }
1117 
1118   // Class resolution will get the class name from the .class stream if the name is null.
1119   TempNewSymbol class_name = name == nullptr ? nullptr :
1120        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1121                                            CHECK_NULL);
1122 
1123   ResourceMark rm(THREAD);
1124   ClassFileStream st((u1*)buf, len, source);
1125   Handle class_loader (THREAD, JNIHandles::resolve(loader));
1126   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1127   ClassLoadInfo cl_info(protection_domain);
1128   Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1129                                                    class_loader,
1130                                                    cl_info,
1131                                                    CHECK_NULL);
1132 
1133   if (log_is_enabled(Debug, class, resolve)) {
1134     trace_class_resolution(k);
1135   }
1136 
1137   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1138 }
1139 
1140 enum {
1141   NESTMATE              = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1142   HIDDEN_CLASS          = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1143   STRONG_LOADER_LINK    = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1144   ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1145 };
1146 
1147 /*
1148  * Define a class with the specified flags that indicates if it's a nestmate,
1149  * hidden, or strongly referenced from class loader.
1150  */
1151 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1152                                       const jbyte *buf, jsize len, jobject pd,
1153                                       jboolean init, int flags, jobject classData, TRAPS) {
1154   ResourceMark rm(THREAD);
1155 
1156   InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1157   // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1158   if (lookup_k == nullptr) {
1159     // The error message is wrong. We come here only if lookup is a primitive class
1160     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1161   }
1162 
1163   Handle class_loader (THREAD, lookup_k->class_loader());
1164 
1165   bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1166   bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1167   bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1168   bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1169 
1170   InstanceKlass* host_class = nullptr;
1171   if (is_nestmate) {
1172     host_class = lookup_k->nest_host(CHECK_NULL);
1173   }
1174 
1175   log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1176                              name,
1177                              is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1178                              is_nestmate ? host_class->external_name() : "",
1179                              is_hidden ? "hidden" : "not hidden",
1180                              is_strong ? "strong" : "weak",
1181                              vm_annotations ? "with vm annotations" : "without vm annotation");
1182 
1183   if (!is_hidden) {
1184     // classData is only applicable for hidden classes
1185     if (classData != nullptr) {
1186       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1187     }
1188     if (is_nestmate) {
1189       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1190     }
1191     if (!is_strong) {
1192       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1193     }
1194     if (vm_annotations) {
1195       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1196     }
1197     if (flags != STRONG_LOADER_LINK) {
1198       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1199                      err_msg("invalid flag 0x%x", flags));
1200     }
1201   }
1202 
1203   // Class resolution will get the class name from the .class stream if the name is null.
1204   TempNewSymbol class_name = name == nullptr ? nullptr :
1205        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1206                                            CHECK_NULL);
1207 
1208   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1209   const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1210   ClassFileStream st((u1*)buf, len, source);
1211 
1212   InstanceKlass* ik = nullptr;
1213   if (!is_hidden) {
1214     ClassLoadInfo cl_info(protection_domain);
1215     ik = SystemDictionary::resolve_from_stream(&st, class_name,
1216                                                class_loader,
1217                                                cl_info,
1218                                                CHECK_NULL);
1219 
1220     if (log_is_enabled(Debug, class, resolve)) {
1221       trace_class_resolution(ik);
1222     }
1223   } else { // hidden
1224     Handle classData_h(THREAD, JNIHandles::resolve(classData));
1225     ClassLoadInfo cl_info(protection_domain,
1226                           host_class,
1227                           classData_h,
1228                           is_hidden,
1229                           is_strong,
1230                           vm_annotations);
1231     ik = SystemDictionary::resolve_from_stream(&st, class_name,
1232                                                class_loader,
1233                                                cl_info,
1234                                                CHECK_NULL);
1235 
1236     // The hidden class loader data has been artificially been kept alive to
1237     // this point. The mirror and any instances of this class have to keep
1238     // it alive afterwards.
1239     ik->class_loader_data()->dec_keep_alive_ref_count();
1240 
1241     if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1242       ModuleEntry* module = ik->module();
1243       const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1244       log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1245                                   module_name,
1246                                   ik->external_name(),
1247                                   host_class->external_name(),
1248                                   ik->is_hidden() ? "is hidden" : "is not hidden");
1249     }
1250   }
1251 
1252   if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1253     // non-hidden class or nestmate class must be in the same package as the Lookup class
1254     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1255   }
1256 
1257   if (init) {
1258     ik->initialize(CHECK_NULL);
1259   } else {
1260     ik->link_class(CHECK_NULL);
1261   }
1262 
1263   return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1264 }
1265 
1266 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1267   return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1268 JVM_END
1269 
1270 /*
1271  * Define a class with the specified lookup class.
1272  *  lookup:  Lookup class
1273  *  name:    the name of the class
1274  *  buf:     class bytes
1275  *  len:     length of class bytes
1276  *  pd:      protection domain
1277  *  init:    initialize the class
1278  *  flags:   properties of the class
1279  *  classData: private static pre-initialized field
1280  */
1281 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1282           jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1283 
1284   if (lookup == nullptr) {
1285     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1286   }
1287 
1288   assert(buf != nullptr, "buf must not be null");
1289 
1290   return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1291 JVM_END
1292 
1293 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1294 
1295   return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1296 JVM_END
1297 
1298 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1299   ResourceMark rm(THREAD);
1300 
1301   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1302   char* str = java_lang_String::as_utf8_string(h_name());
1303 
1304   // Sanity check, don't expect null
1305   if (str == nullptr) return nullptr;
1306 
1307   // Internalize the string, converting '.' to '/' in string.
1308   char* p = (char*)str;
1309   while (*p != '\0') {
1310     if (*p == '.') {
1311       *p = '/';
1312     }
1313     p++;
1314   }
1315 
1316   const int str_len = (int)(p - str);
1317   if (str_len > Symbol::max_length()) {
1318     // It's impossible to create this class;  the name cannot fit
1319     // into the constant pool.
1320     return nullptr;
1321   }
1322   TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1323 
1324   // Security Note:
1325   //   The Java level wrapper will perform the necessary security check allowing
1326   //   us to pass the null as the initiating class loader.
1327   Handle h_loader(THREAD, JNIHandles::resolve(loader));
1328   Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1329 #if INCLUDE_CDS
1330   if (k == nullptr) {
1331     // If the class is not already loaded, try to see if it's in the shared
1332     // archive for the current classloader (h_loader).
1333     k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1334   }
1335 #endif
1336   return (k == nullptr) ? nullptr :
1337             (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1338 JVM_END
1339 
1340 // Module support //////////////////////////////////////////////////////////////////////////////
1341 
1342 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1343                                  jstring location, jobjectArray packages))
1344   Handle h_module (THREAD, JNIHandles::resolve(module));
1345   Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1346 JVM_END
1347 
1348 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1349   Handle h_module (THREAD, JNIHandles::resolve(module));
1350   Modules::set_bootloader_unnamed_module(h_module, CHECK);
1351 JVM_END
1352 
1353 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1354   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1355   Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1356   Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1357 JVM_END
1358 
1359 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1360   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1361   Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1362 JVM_END
1363 
1364 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1365   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1366   Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1367 JVM_END
1368 
1369 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1370   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1371   Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1372   Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1373 JVM_END
1374 
1375 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1376   Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1377   Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1378   Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1379 JVM_END
1380 
1381 // Reflection support //////////////////////////////////////////////////////////////////////////////
1382 
1383 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1384   assert (cls != nullptr, "illegal class");
1385   JvmtiVMObjectAllocEventCollector oam;
1386   ResourceMark rm(THREAD);
1387   HandleMark hm(THREAD);
1388   Handle java_class(THREAD, JNIHandles::resolve(cls));
1389   oop result = java_lang_Class::name(java_class, CHECK_NULL);
1390   return (jstring) JNIHandles::make_local(THREAD, result);
1391 JVM_END
1392 
1393 
1394 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1395   JvmtiVMObjectAllocEventCollector oam;
1396   oop mirror = JNIHandles::resolve_non_null(cls);
1397 
1398   // Special handling for primitive objects
1399   if (java_lang_Class::is_primitive(mirror)) {
1400     // Primitive objects does not have any interfaces
1401     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1402     return (jobjectArray) JNIHandles::make_local(THREAD, r);
1403   }
1404 
1405   Klass* klass = java_lang_Class::as_Klass(mirror);
1406   // Figure size of result array
1407   int size;
1408   if (klass->is_instance_klass()) {
1409     InstanceKlass* ik = InstanceKlass::cast(klass);
1410     size = ik->local_interfaces()->length();
1411   } else {
1412     assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1413     size = 2;
1414   }
1415 
1416   // Allocate result array
1417   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1418   objArrayHandle result (THREAD, r);
1419   // Fill in result
1420   if (klass->is_instance_klass()) {
1421     // Regular instance klass, fill in all local interfaces
1422     for (int index = 0; index < size; index++) {
1423       InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1424       result->obj_at_put(index, k->java_mirror());
1425     }
1426   } else {
1427     // All arrays implement java.lang.Cloneable and java.io.Serializable
1428     result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1429     result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1430   }
1431   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1432 JVM_END
1433 
1434 
1435 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1436   oop mirror = JNIHandles::resolve_non_null(cls);
1437   if (java_lang_Class::is_primitive(mirror)) {
1438     return JNI_FALSE;
1439   }
1440   Klass* k = java_lang_Class::as_Klass(mirror);
1441   return k->is_hidden();
1442 JVM_END
1443 
1444 
1445 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1446   ResourceMark rm(THREAD);
1447   GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1448   JvmtiVMObjectAllocEventCollector oam;
1449 
1450   // Iterate through Java frames
1451   vframeStream vfst(thread);
1452   for(; !vfst.at_end(); vfst.next()) {
1453     int loc = -1;
1454     // get method of frame
1455     Method* method = vfst.method();
1456 
1457     Symbol *name = method->name();
1458 
1459     InstanceKlass* holder = method->method_holder();
1460     if (name == vmSymbols::runWith_method_name()) {
1461       if (holder == vmClasses::Thread_klass()
1462           || holder == vmClasses::ScopedValue_Carrier_klass()) {
1463         loc = 1;
1464       }
1465     }
1466 
1467     if (loc != -1) {
1468       javaVFrame *frame = vfst.asJavaVFrame();
1469       StackValueCollection* locals = frame->locals();
1470       StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1471       Handle result = head_sv->get_obj();
1472       assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1473       if (result() != nullptr) {
1474         return JNIHandles::make_local(THREAD, result());
1475       }
1476     }
1477   }
1478 
1479   return nullptr;
1480 JVM_END
1481 
1482 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1483   JvmtiVMObjectAllocEventCollector oam;
1484   // ofClass is a reference to a java_lang_Class object. The mirror object
1485   // of an InstanceKlass
1486   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1487   if (java_lang_Class::is_primitive(ofMirror) ||
1488       ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1489     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1490     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1491   }
1492 
1493   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1494   InnerClassesIterator iter(k);
1495 
1496   if (iter.length() == 0) {
1497     // Neither an inner nor outer class
1498     oop result = oopFactory::new_refArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1499     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1500   }
1501 
1502   // find inner class info
1503   constantPoolHandle cp(thread, k->constants());
1504   int length = iter.length();
1505 
1506   // Allocate temp. result array
1507   refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length / 4, CHECK_NULL);
1508   refArrayHandle result(THREAD, r);
1509   int members = 0;
1510 
1511   for (; !iter.done(); iter.next()) {
1512     int ioff = iter.inner_class_info_index();
1513     int ooff = iter.outer_class_info_index();
1514 
1515     if (ioff != 0 && ooff != 0) {
1516       // Check to see if the name matches the class we're looking for
1517       // before attempting to find the class.
1518       if (cp->klass_name_at_matches(k, ooff)) {
1519         Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1520         if (outer_klass == k) {
1521            Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1522            InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1523 
1524            // Throws an exception if outer klass has not declared k as
1525            // an inner klass
1526            Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1527 
1528            result->obj_at_put(members, inner_klass->java_mirror());
1529            members++;
1530         }
1531       }
1532     }
1533   }
1534 
1535   if (members != length) {
1536     // Return array of right length
1537     refArrayOop res = oopFactory::new_refArray(vmClasses::Class_klass(), members, CHECK_NULL);
1538     for(int i = 0; i < members; i++) {
1539       res->obj_at_put(i, result->obj_at(i));
1540     }
1541     return (jobjectArray)JNIHandles::make_local(THREAD, res);
1542   }
1543 
1544   return (jobjectArray)JNIHandles::make_local(THREAD, result());
1545 JVM_END
1546 
1547 
1548 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1549 {
1550   // ofClass is a reference to a java_lang_Class object.
1551   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1552   if (java_lang_Class::is_primitive(ofMirror)) {
1553     return nullptr;
1554   }
1555   Klass* klass = java_lang_Class::as_Klass(ofMirror);
1556   if (!klass->is_instance_klass()) {
1557     return nullptr;
1558   }
1559 
1560   bool inner_is_member = false;
1561   Klass* outer_klass
1562     = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1563   if (outer_klass == nullptr)  return nullptr;  // already a top-level class
1564   if (!inner_is_member)  return nullptr;     // a hidden class (inside a method)
1565   return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1566 }
1567 JVM_END
1568 
1569 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1570 {
1571   oop mirror = JNIHandles::resolve_non_null(cls);
1572   if (java_lang_Class::is_primitive(mirror)) {
1573     return nullptr;
1574   }
1575   Klass* klass = java_lang_Class::as_Klass(mirror);
1576   if (!klass->is_instance_klass()) {
1577     return nullptr;
1578   }
1579   InstanceKlass* k = InstanceKlass::cast(klass);
1580   int ooff = 0, noff = 0;
1581   if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1582     if (noff != 0) {
1583       constantPoolHandle i_cp(thread, k->constants());
1584       Symbol* name = i_cp->symbol_at(noff);
1585       Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1586       return (jstring) JNIHandles::make_local(THREAD, str());
1587     }
1588   }
1589   return nullptr;
1590 }
1591 JVM_END
1592 
1593 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1594   assert (cls != nullptr, "illegal class");
1595   JvmtiVMObjectAllocEventCollector oam;
1596   ResourceMark rm(THREAD);
1597   oop mirror = JNIHandles::resolve_non_null(cls);
1598   // Return null for arrays and primitives
1599   if (!java_lang_Class::is_primitive(mirror)) {
1600     Klass* k = java_lang_Class::as_Klass(mirror);
1601     if (k->is_instance_klass()) {
1602       Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1603       if (sym == nullptr) return nullptr;
1604       Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1605       return (jstring) JNIHandles::make_local(THREAD, str());
1606     }
1607   }
1608   return nullptr;
1609 JVM_END
1610 
1611 
1612 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1613   assert (cls != nullptr, "illegal class");
1614   oop mirror = JNIHandles::resolve_non_null(cls);
1615   // Return null for arrays and primitives
1616   if (!java_lang_Class::is_primitive(mirror)) {
1617     Klass* k = java_lang_Class::as_Klass(mirror);
1618     if (k->is_instance_klass()) {
1619       typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1620       return (jbyteArray) JNIHandles::make_local(THREAD, a);
1621     }
1622   }
1623   return nullptr;
1624 JVM_END
1625 
1626 
1627 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1628   // some of this code was adapted from from jni_FromReflectedField
1629 
1630   oop reflected = JNIHandles::resolve_non_null(field);
1631   oop mirror    = java_lang_reflect_Field::clazz(reflected);
1632   int slot      = java_lang_reflect_Field::slot(reflected);
1633   int modifiers = java_lang_reflect_Field::modifiers(reflected);
1634 
1635   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1636   int offset = ik->field_offset(slot);
1637 
1638   if (modifiers & JVM_ACC_STATIC) {
1639     // for static fields we only look in the current class
1640     if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1641       assert(false, "cannot find static field");
1642       return false;
1643     }
1644   } else {
1645     // for instance fields we start with the current class and work
1646     // our way up through the superclass chain
1647     if (!ik->find_field_from_offset(offset, false, &fd)) {
1648       assert(false, "cannot find instance field");
1649       return false;
1650     }
1651   }
1652   return true;
1653 }
1654 
1655 static Method* jvm_get_method_common(jobject method) {
1656   // some of this code was adapted from from jni_FromReflectedMethod
1657 
1658   oop reflected = JNIHandles::resolve_non_null(method);
1659   oop mirror    = nullptr;
1660   int slot      = 0;
1661 
1662   if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1663     mirror = java_lang_reflect_Constructor::clazz(reflected);
1664     slot   = java_lang_reflect_Constructor::slot(reflected);
1665   } else {
1666     assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1667            "wrong type");
1668     mirror = java_lang_reflect_Method::clazz(reflected);
1669     slot   = java_lang_reflect_Method::slot(reflected);
1670   }
1671   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1672 
1673   Method* m = ik->method_with_idnum(slot);
1674   assert(m != nullptr, "cannot find method");
1675   return m;  // caller has to deal with null in product mode
1676 }
1677 
1678 /* Type use annotations support (JDK 1.8) */
1679 
1680 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1681   assert (cls != nullptr, "illegal class");
1682   ResourceMark rm(THREAD);
1683   // Return null for arrays and primitives
1684   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1685     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1686     if (k->is_instance_klass()) {
1687       AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1688       if (type_annotations != nullptr) {
1689         typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1690         return (jbyteArray) JNIHandles::make_local(THREAD, a);
1691       }
1692     }
1693   }
1694   return nullptr;
1695 JVM_END
1696 
1697 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1698   assert (method != nullptr, "illegal method");
1699   // method is a handle to a java.lang.reflect.Method object
1700   Method* m = jvm_get_method_common(method);
1701   if (m == nullptr) {
1702     return nullptr;
1703   }
1704 
1705   AnnotationArray* type_annotations = m->type_annotations();
1706   if (type_annotations != nullptr) {
1707     typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1708     return (jbyteArray) JNIHandles::make_local(THREAD, a);
1709   }
1710 
1711   return nullptr;
1712 JVM_END
1713 
1714 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1715   assert (field != nullptr, "illegal field");
1716   fieldDescriptor fd;
1717   bool gotFd = jvm_get_field_common(field, fd);
1718   if (!gotFd) {
1719     return nullptr;
1720   }
1721 
1722   return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1723 JVM_END
1724 
1725 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1726   if (!cp->is_within_bounds(index)) {
1727     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1728   }
1729 }
1730 
1731 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1732 {
1733   // method is a handle to a java.lang.reflect.Method object
1734   Method* method_ptr = jvm_get_method_common(method);
1735   methodHandle mh (THREAD, method_ptr);
1736   Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1737   const int num_params = mh->method_parameters_length();
1738 
1739   if (num_params < 0) {
1740     // A -1 return value from method_parameters_length means there is no
1741     // parameter data.  Return null to indicate this to the reflection
1742     // API.
1743     assert(num_params == -1, "num_params should be -1 if it is less than zero");
1744     return (jobjectArray)nullptr;
1745   } else {
1746     // Otherwise, we return something up to reflection, even if it is
1747     // a zero-length array.  Why?  Because in some cases this can
1748     // trigger a MalformedParametersException.
1749 
1750     // make sure all the symbols are properly formatted
1751     for (int i = 0; i < num_params; i++) {
1752       MethodParametersElement* params = mh->method_parameters_start();
1753       int index = params[i].name_cp_index;
1754       constantPoolHandle cp(THREAD, mh->constants());
1755       bounds_check(cp, index, CHECK_NULL);
1756 
1757       if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1758         THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1759                        "Wrong type at constant pool index");
1760       }
1761 
1762     }
1763 
1764     objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1765     objArrayHandle result (THREAD, result_oop);
1766 
1767     for (int i = 0; i < num_params; i++) {
1768       MethodParametersElement* params = mh->method_parameters_start();
1769       // For a 0 index, give a null symbol
1770       Symbol* sym = 0 != params[i].name_cp_index ?
1771         mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1772       int flags = params[i].flags;
1773       oop param = Reflection::new_parameter(reflected_method, i, sym,
1774                                             flags, CHECK_NULL);
1775       result->obj_at_put(i, param);
1776     }
1777     return (jobjectArray)JNIHandles::make_local(THREAD, result());
1778   }
1779 }
1780 JVM_END
1781 
1782 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1783 
1784 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1785 {
1786   JvmtiVMObjectAllocEventCollector oam;
1787 
1788   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1789   // Exclude primitive types and array types
1790   if (java_lang_Class::is_primitive(ofMirror) ||
1791       java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1792     // Return empty array
1793     oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1794     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1795   }
1796 
1797   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1798   constantPoolHandle cp(THREAD, k->constants());
1799 
1800   // Ensure class is linked
1801   k->link_class(CHECK_NULL);
1802 
1803   // Allocate result
1804   int num_fields;
1805 
1806   if (publicOnly) {
1807     num_fields = 0;
1808     for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1809       if (fs.access_flags().is_public()) ++num_fields;
1810     }
1811   } else {
1812     num_fields = k->java_fields_count();
1813   }
1814 
1815   objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1816   objArrayHandle result (THREAD, r);
1817 
1818   int out_idx = 0;
1819   fieldDescriptor fd;
1820   for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1821     if (!publicOnly || fs.access_flags().is_public()) {
1822       fd.reinitialize(k, fs.to_FieldInfo());
1823       oop field = Reflection::new_field(&fd, CHECK_NULL);
1824       result->obj_at_put(out_idx, field);
1825       ++out_idx;
1826     }
1827   }
1828   assert(out_idx == num_fields, "just checking");
1829   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1830 }
1831 JVM_END
1832 
1833 // A class is a record if and only if it is final and a direct subclass of
1834 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1835 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1836 {
1837   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1838   if (k != nullptr && k->is_instance_klass()) {
1839     InstanceKlass* ik = InstanceKlass::cast(k);
1840     return ik->is_record();
1841   } else {
1842     return false;
1843   }
1844 }
1845 JVM_END
1846 
1847 // Returns an array containing the components of the Record attribute,
1848 // or null if the attribute is not present.
1849 //
1850 // Note that this function returns the components of the Record attribute
1851 // even if the class is not a record.
1852 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1853 {
1854   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1855 
1856   Array<RecordComponent*>* components = ik->record_components();
1857   if (components != nullptr) {
1858     JvmtiVMObjectAllocEventCollector oam;
1859     constantPoolHandle cp(THREAD, ik->constants());
1860     int length = components->length();
1861     assert(length >= 0, "unexpected record_components length");
1862     objArrayOop record_components =
1863       oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1864     objArrayHandle components_h (THREAD, record_components);
1865 
1866     for (int x = 0; x < length; x++) {
1867       RecordComponent* component = components->at(x);
1868       assert(component != nullptr, "unexpected null record component");
1869       oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1870       components_h->obj_at_put(x, component_oop);
1871     }
1872     return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1873   }
1874 
1875   return nullptr;
1876 }
1877 JVM_END
1878 
1879 static jobjectArray get_class_declared_methods_helper(
1880                                   JNIEnv *env,
1881                                   jclass ofClass, jboolean publicOnly,
1882                                   bool want_constructor,
1883                                   Klass* klass, TRAPS) {
1884 
1885   JvmtiVMObjectAllocEventCollector oam;
1886 
1887   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1888   // Exclude primitive types and array types
1889   if (java_lang_Class::is_primitive(ofMirror)
1890       || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1891     // Return empty array
1892     oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1893     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1894   }
1895 
1896   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1897 
1898   // Ensure class is linked
1899   k->link_class(CHECK_NULL);
1900 
1901   Array<Method*>* methods = k->methods();
1902   int methods_length = methods->length();
1903 
1904   // Save original method_idnum in case of redefinition, which can change
1905   // the idnum of obsolete methods.  The new method will have the same idnum
1906   // but if we refresh the methods array, the counts will be wrong.
1907   ResourceMark rm(THREAD);
1908   GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1909   int num_methods = 0;
1910 
1911   // Select methods matching the criteria.
1912   for (int i = 0; i < methods_length; i++) {
1913     Method* method = methods->at(i);
1914     if (want_constructor && !method->is_object_constructor()) {
1915       continue;
1916     }
1917     if (!want_constructor &&
1918         (method->is_object_constructor() || method->is_class_initializer() ||
1919          method->is_overpass())) {
1920       continue;
1921     }
1922     if (publicOnly && !method->is_public()) {
1923       continue;
1924     }
1925     idnums->push(method->method_idnum());
1926     ++num_methods;
1927   }
1928 
1929   // Allocate result
1930   objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1931   objArrayHandle result (THREAD, r);
1932 
1933   // Now just put the methods that we selected above, but go by their idnum
1934   // in case of redefinition.  The methods can be redefined at any safepoint,
1935   // so above when allocating the oop array and below when creating reflect
1936   // objects.
1937   for (int i = 0; i < num_methods; i++) {
1938     methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1939     if (method.is_null()) {
1940       // Method may have been deleted and seems this API can handle null
1941       // Otherwise should probably put a method that throws NSME
1942       result->obj_at_put(i, nullptr);
1943     } else {
1944       oop m;
1945       if (want_constructor) {
1946         assert(method->is_object_constructor(), "must be");
1947         m = Reflection::new_constructor(method, CHECK_NULL);
1948       } else {
1949         m = Reflection::new_method(method, false, CHECK_NULL);
1950       }
1951       result->obj_at_put(i, m);
1952     }
1953   }
1954 
1955   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1956 }
1957 
1958 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1959 {
1960   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1961                                            /*want_constructor*/ false,
1962                                            vmClasses::reflect_Method_klass(), THREAD);
1963 }
1964 JVM_END
1965 
1966 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1967 {
1968   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1969                                            /*want_constructor*/ true,
1970                                            vmClasses::reflect_Constructor_klass(), THREAD);
1971 }
1972 JVM_END
1973 
1974 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1975 {
1976   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1977   InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1978   return c->has_nestmate_access_to(m, THREAD);
1979 }
1980 JVM_END
1981 
1982 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1983 {
1984   // current is not a primitive or array class
1985   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1986   InstanceKlass* host = c->nest_host(THREAD);
1987   return (jclass) (host == nullptr ? nullptr :
1988                    JNIHandles::make_local(THREAD, host->java_mirror()));
1989 }
1990 JVM_END
1991 
1992 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1993 {
1994   // current is not a primitive or array class
1995   ResourceMark rm(THREAD);
1996   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1997   InstanceKlass* host = c->nest_host(THREAD);
1998 
1999   log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
2000                               c->external_name(), host->external_name());
2001   {
2002     JvmtiVMObjectAllocEventCollector oam;
2003     Array<u2>* members = host->nest_members();
2004     int length = members == nullptr ? 0 : members->length();
2005 
2006     log_trace(class, nestmates)(" - host has %d listed nest members", length);
2007 
2008     // nest host is first in the array so make it one bigger
2009     refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length + 1, CHECK_NULL);
2010     refArrayHandle result(THREAD, r);

2011     result->obj_at_put(0, host->java_mirror());
2012     if (length != 0) {
2013       int count = 0;
2014       for (int i = 0; i < length; i++) {
2015         int cp_index = members->at(i);
2016         Klass* k = host->constants()->klass_at(cp_index, THREAD);
2017         if (HAS_PENDING_EXCEPTION) {
2018           if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2019             return nullptr; // propagate VMEs
2020           }
2021           if (log_is_enabled(Trace, class, nestmates)) {
2022             stringStream ss;
2023             char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
2024             ss.print(" - resolution of nest member %s failed: ", target_member_class);
2025             java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2026             log_trace(class, nestmates)("%s", ss.as_string());
2027           }
2028           CLEAR_PENDING_EXCEPTION;
2029           continue;
2030         }
2031         if (k->is_instance_klass()) {
2032           InstanceKlass* ik = InstanceKlass::cast(k);
2033           InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2034           if (nest_host_k == host) {
2035             result->obj_at_put(count+1, k->java_mirror());
2036             count++;
2037             log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2038           } else {
2039             log_trace(class, nestmates)(" - skipping member %s with different host %s",
2040                                         ik->external_name(), nest_host_k->external_name());
2041           }
2042         } else {
2043           log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2044                                       k->external_name());
2045         }
2046       }
2047       if (count < length) {
2048         // we had invalid entries so we need to compact the array
2049         log_trace(class, nestmates)(" - compacting array from length %d to %d",
2050                                     length + 1, count + 1);
2051 
2052         objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2053                                                   count + 1, CHECK_NULL);
2054         objArrayHandle result2(THREAD, r2);
2055         for (int i = 0; i < count + 1; i++) {
2056           result2->obj_at_put(i, result->obj_at(i));
2057         }
2058         return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2059       }
2060     }
2061     else {
2062       assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
2063     }
2064     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2065   }
2066 }
2067 JVM_END
2068 
2069 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2070 {
2071   oop mirror = JNIHandles::resolve_non_null(current);
2072   assert(!java_lang_Class::is_primitive(mirror), "should not be");
2073   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2074 
2075   ResourceMark rm(THREAD);
2076   log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2077                            ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2078   if (ik->is_sealed()) {
2079     JvmtiVMObjectAllocEventCollector oam;
2080     Array<u2>* subclasses = ik->permitted_subclasses();
2081     int length = subclasses->length();
2082 
2083     log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2084 
2085     refArrayOop r = oopFactory::new_refArray(vmClasses::Class_klass(), length, CHECK_NULL);
2086     refArrayHandle result(THREAD, r);

2087     int count = 0;
2088     for (int i = 0; i < length; i++) {
2089       int cp_index = subclasses->at(i);
2090       Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2091       if (HAS_PENDING_EXCEPTION) {
2092         if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2093           return nullptr; // propagate VMEs
2094         }
2095         if (log_is_enabled(Trace, class, sealed)) {
2096           stringStream ss;
2097           char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2098           ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2099           java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2100           log_trace(class, sealed)("%s", ss.as_string());
2101         }
2102 
2103         CLEAR_PENDING_EXCEPTION;
2104         continue;
2105       }
2106       if (k->is_instance_klass()) {
2107         result->obj_at_put(count++, k->java_mirror());
2108         log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2109       }
2110     }
2111     if (count < length) {
2112       // we had invalid entries so we need to compact the array
2113       objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2114                                                 count, CHECK_NULL);
2115       objArrayHandle result2(THREAD, r2);
2116       for (int i = 0; i < count; i++) {
2117         result2->obj_at_put(i, result->obj_at(i));
2118       }
2119       return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2120     }
2121     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2122   } else {
2123     return nullptr;
2124   }
2125 }
2126 JVM_END
2127 
2128 // Constant pool access //////////////////////////////////////////////////////////
2129 
2130 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2131 {
2132   JvmtiVMObjectAllocEventCollector oam;
2133   oop mirror = JNIHandles::resolve_non_null(cls);
2134   // Return null for primitives and arrays
2135   if (!java_lang_Class::is_primitive(mirror)) {
2136     Klass* k = java_lang_Class::as_Klass(mirror);
2137     if (k->is_instance_klass()) {
2138       InstanceKlass* k_h = InstanceKlass::cast(k);
2139       Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2140       reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2141       return JNIHandles::make_local(THREAD, jcp());
2142     }
2143   }
2144   return nullptr;
2145 }
2146 JVM_END
2147 
2148 
2149 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2150 {
2151   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2152   return cp->length();
2153 }
2154 JVM_END
2155 
2156 
2157 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2158 {
2159   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2160   bounds_check(cp, index, CHECK_NULL);
2161   constantTag tag = cp->tag_at(index);
2162   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2163     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2164   }
2165   Klass* k = cp->klass_at(index, CHECK_NULL);
2166   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2167 }
2168 JVM_END
2169 
2170 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2171 {
2172   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2173   bounds_check(cp, index, CHECK_NULL);
2174   constantTag tag = cp->tag_at(index);
2175   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2176     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2177   }
2178   Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2179   if (k == nullptr) return nullptr;
2180   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2181 }
2182 JVM_END
2183 
2184 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2185   constantTag tag = cp->tag_at(index);
2186   if (!tag.is_method() && !tag.is_interface_method()) {
2187     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2188   }
2189   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2190   Klass* k_o;
2191   if (force_resolution) {
2192     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2193   } else {
2194     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2195     if (k_o == nullptr) return nullptr;
2196   }
2197   InstanceKlass* k = InstanceKlass::cast(k_o);
2198   Symbol* name = cp->uncached_name_ref_at(index);
2199   Symbol* sig  = cp->uncached_signature_ref_at(index);
2200   methodHandle m (THREAD, k->find_method(name, sig));
2201   if (m.is_null()) {
2202     THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2203   }
2204   oop method;
2205   if (m->is_object_constructor()) {
2206     method = Reflection::new_constructor(m, CHECK_NULL);
2207   } else {

2208     method = Reflection::new_method(m, true, CHECK_NULL);
2209   }
2210   return JNIHandles::make_local(THREAD, method);
2211 }
2212 
2213 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2214 {
2215   JvmtiVMObjectAllocEventCollector oam;
2216   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2217   bounds_check(cp, index, CHECK_NULL);
2218   jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2219   return res;
2220 }
2221 JVM_END
2222 
2223 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2224 {
2225   JvmtiVMObjectAllocEventCollector oam;
2226   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2227   bounds_check(cp, index, CHECK_NULL);
2228   jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2229   return res;
2230 }
2231 JVM_END
2232 
2233 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2234   constantTag tag = cp->tag_at(index);
2235   if (!tag.is_field()) {
2236     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2237   }
2238   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2239   Klass* k_o;
2240   if (force_resolution) {
2241     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2242   } else {
2243     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2244     if (k_o == nullptr) return nullptr;
2245   }
2246   InstanceKlass* k = InstanceKlass::cast(k_o);
2247   Symbol* name = cp->uncached_name_ref_at(index);
2248   Symbol* sig  = cp->uncached_signature_ref_at(index);
2249   fieldDescriptor fd;
2250   Klass* target_klass = k->find_field(name, sig, &fd);
2251   if (target_klass == nullptr) {
2252     THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2253   }
2254   oop field = Reflection::new_field(&fd, CHECK_NULL);
2255   return JNIHandles::make_local(THREAD, field);
2256 }
2257 
2258 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2259 {
2260   JvmtiVMObjectAllocEventCollector oam;
2261   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2262   bounds_check(cp, index, CHECK_NULL);
2263   jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2264   return res;
2265 }
2266 JVM_END
2267 
2268 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2269 {
2270   JvmtiVMObjectAllocEventCollector oam;
2271   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2272   bounds_check(cp, index, CHECK_NULL);
2273   jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2274   return res;
2275 }
2276 JVM_END
2277 
2278 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2279 {
2280   JvmtiVMObjectAllocEventCollector oam;
2281   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2282   bounds_check(cp, index, CHECK_NULL);
2283   constantTag tag = cp->tag_at(index);
2284   if (!tag.is_field_or_method()) {
2285     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2286   }
2287   int klass_ref = cp->uncached_klass_ref_index_at(index);
2288   Symbol*  klass_name  = cp->klass_name_at(klass_ref);
2289   Symbol*  member_name = cp->uncached_name_ref_at(index);
2290   Symbol*  member_sig  = cp->uncached_signature_ref_at(index);
2291   objArrayOop  dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2292   objArrayHandle dest(THREAD, dest_o);
2293   Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2294   dest->obj_at_put(0, str());
2295   str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2296   dest->obj_at_put(1, str());
2297   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2298   dest->obj_at_put(2, str());
2299   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2300 }
2301 JVM_END
2302 
2303 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2304 {
2305   JvmtiVMObjectAllocEventCollector oam;
2306   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2307   bounds_check(cp, index, CHECK_0);
2308   constantTag tag = cp->tag_at(index);
2309   if (!tag.is_field_or_method()) {
2310     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2311   }
2312   return (jint) cp->uncached_klass_ref_index_at(index);
2313 }
2314 JVM_END
2315 
2316 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2317 {
2318   JvmtiVMObjectAllocEventCollector oam;
2319   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2320   bounds_check(cp, index, CHECK_0);
2321   constantTag tag = cp->tag_at(index);
2322   if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2323     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2324   }
2325   return (jint) cp->uncached_name_and_type_ref_index_at(index);
2326 }
2327 JVM_END
2328 
2329 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2330 {
2331   JvmtiVMObjectAllocEventCollector oam;
2332   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2333   bounds_check(cp, index, CHECK_NULL);
2334   constantTag tag = cp->tag_at(index);
2335   if (!tag.is_name_and_type()) {
2336     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2337   }
2338   Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2339   Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2340   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2341   objArrayHandle dest(THREAD, dest_o);
2342   Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2343   dest->obj_at_put(0, str());
2344   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2345   dest->obj_at_put(1, str());
2346   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2347 }
2348 JVM_END
2349 
2350 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2351 {
2352   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2353   bounds_check(cp, index, CHECK_0);
2354   constantTag tag = cp->tag_at(index);
2355   if (!tag.is_int()) {
2356     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2357   }
2358   return cp->int_at(index);
2359 }
2360 JVM_END
2361 
2362 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2363 {
2364   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2365   bounds_check(cp, index, CHECK_(0L));
2366   constantTag tag = cp->tag_at(index);
2367   if (!tag.is_long()) {
2368     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2369   }
2370   return cp->long_at(index);
2371 }
2372 JVM_END
2373 
2374 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2375 {
2376   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2377   bounds_check(cp, index, CHECK_(0.0f));
2378   constantTag tag = cp->tag_at(index);
2379   if (!tag.is_float()) {
2380     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2381   }
2382   return cp->float_at(index);
2383 }
2384 JVM_END
2385 
2386 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2387 {
2388   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2389   bounds_check(cp, index, CHECK_(0.0));
2390   constantTag tag = cp->tag_at(index);
2391   if (!tag.is_double()) {
2392     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2393   }
2394   return cp->double_at(index);
2395 }
2396 JVM_END
2397 
2398 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2399 {
2400   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2401   bounds_check(cp, index, CHECK_NULL);
2402   constantTag tag = cp->tag_at(index);
2403   if (!tag.is_string()) {
2404     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2405   }
2406   oop str = cp->string_at(index, CHECK_NULL);
2407   return (jstring) JNIHandles::make_local(THREAD, str);
2408 }
2409 JVM_END
2410 
2411 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2412 {
2413   JvmtiVMObjectAllocEventCollector oam;
2414   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2415   bounds_check(cp, index, CHECK_NULL);
2416   constantTag tag = cp->tag_at(index);
2417   if (!tag.is_symbol()) {
2418     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2419   }
2420   Symbol* sym = cp->symbol_at(index);
2421   Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2422   return (jstring) JNIHandles::make_local(THREAD, str());
2423 }
2424 JVM_END
2425 
2426 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2427 {
2428   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2429   bounds_check(cp, index, CHECK_0);
2430   constantTag tag = cp->tag_at(index);
2431   jbyte result = tag.value();
2432   // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2433   // they are changed to the corresponding tags from the JVM spec, so that java code in
2434   // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2435   if (tag.is_klass_or_reference()) {
2436       result = JVM_CONSTANT_Class;
2437   } else if (tag.is_string_index()) {
2438       result = JVM_CONSTANT_String;
2439   } else if (tag.is_method_type_in_error()) {
2440       result = JVM_CONSTANT_MethodType;
2441   } else if (tag.is_method_handle_in_error()) {
2442       result = JVM_CONSTANT_MethodHandle;
2443   } else if (tag.is_dynamic_constant_in_error()) {
2444       result = JVM_CONSTANT_Dynamic;
2445   }
2446   return result;
2447 }
2448 JVM_END
2449 
2450 // Assertion support. //////////////////////////////////////////////////////////
2451 
2452 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2453   assert(cls != nullptr, "bad class");
2454 
2455   oop r = JNIHandles::resolve(cls);
2456   assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2457   if (java_lang_Class::is_primitive(r)) return false;
2458 
2459   Klass* k = java_lang_Class::as_Klass(r);
2460   assert(k->is_instance_klass(), "must be an instance klass");
2461   if (!k->is_instance_klass()) return false;
2462 
2463   ResourceMark rm(THREAD);
2464   const char* name = k->name()->as_C_string();
2465   bool system_class = k->class_loader() == nullptr;
2466   return JavaAssertions::enabled(name, system_class);
2467 
2468 JVM_END
2469 
2470 
2471 // Return a new AssertionStatusDirectives object with the fields filled in with
2472 // command-line assertion arguments (i.e., -ea, -da).
2473 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2474   JvmtiVMObjectAllocEventCollector oam;
2475   oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2476   return JNIHandles::make_local(THREAD, asd);
2477 JVM_END
2478 
2479 // Verification ////////////////////////////////////////////////////////////////////////////////
2480 
2481 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2482 
2483 // RedefineClasses support: bug 6214132 caused verification to fail.
2484 // All functions from this section, unless noted otherwise, should call the functions
2485 //   get_klass_considering_redefinition(), or
2486 //   get_instance_klass_considering_redefinition()
2487 // These functions return JvmtiThreadState::_scratch_class if the verifier
2488 // was invoked in the middle of the redefinition of cls.
2489 // See jvmtiThreadState.hpp for details.
2490 
2491 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2492   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2493   if (k->is_instance_klass()) {
2494     return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2495   } else {
2496     return k;
2497   }
2498 }
2499 
2500 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2501   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2502   return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2503 }
2504 
2505 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2506   oop mirror = JNIHandles::resolve_non_null(cls);
2507   if (java_lang_Class::is_primitive(mirror)) {
2508     return JNI_FALSE;
2509   }
2510   Klass* k = java_lang_Class::as_Klass(mirror);
2511   // This isn't necessary since answer is the same because redefinition
2512   // has already checked this matches for the scratch class.
2513   // k = get_klass_considering_redefinition(cls, thread)
2514   jboolean result = k->is_interface();
2515   assert(!result || k->is_instance_klass(),
2516          "all interfaces are instance types");
2517   return result;
2518 JVM_END
2519 
2520 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2521   // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2522   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2523   return k->name()->as_utf8();
2524 JVM_END
2525 
2526 
2527 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2528   Klass* k = get_klass_considering_redefinition(cls, thread);
2529   // types will have length zero if this is not an InstanceKlass
2530   // (length is determined by call to JVM_GetClassCPEntriesCount)
2531   if (k->is_instance_klass()) {
2532     ConstantPool* cp = InstanceKlass::cast(k)->constants();
2533     for (int index = cp->length() - 1; index >= 0; index--) {
2534       constantTag tag = cp->tag_at(index);
2535       types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2536     }
2537   }
2538 JVM_END
2539 
2540 
2541 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2542   Klass* k = get_klass_considering_redefinition(cls, thread);
2543   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2544 JVM_END
2545 
2546 
2547 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2548   Klass* k = get_klass_considering_redefinition(cls, thread);
2549   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2550 JVM_END
2551 
2552 
2553 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2554   Klass* k = get_klass_considering_redefinition(cls, thread);
2555   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2556 JVM_END
2557 
2558 
2559 // The following methods, used for the verifier, are never called with
2560 // array klasses, so a direct cast to InstanceKlass is safe.
2561 // Typically, these methods are called in a loop with bounds determined
2562 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2563 // zero for arrays.
2564 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2565   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2566   Method* method = ik->methods()->at(method_index);
2567   int length = method->checked_exceptions_length();
2568   if (length > 0) {
2569     CheckedExceptionElement* table= method->checked_exceptions_start();
2570     for (int i = 0; i < length; i++) {
2571       exceptions[i] = table[i].class_cp_index;
2572     }
2573   }
2574 JVM_END
2575 
2576 
2577 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2578   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2579   Method* method = ik->methods()->at(method_index);
2580   return method->checked_exceptions_length();
2581 JVM_END
2582 
2583 
2584 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2585   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2586   Method* method = ik->methods()->at(method_index);
2587   memcpy(code, method->code_base(), method->code_size());
2588 JVM_END
2589 
2590 
2591 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2592   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2593   Method* method = ik->methods()->at(method_index);
2594   return method->code_size();
2595 JVM_END
2596 
2597 
2598 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2599   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2600   Method* method = ik->methods()->at(method_index);
2601   ExceptionTable extable(method);
2602   entry->start_pc   = extable.start_pc(entry_index);
2603   entry->end_pc     = extable.end_pc(entry_index);
2604   entry->handler_pc = extable.handler_pc(entry_index);
2605   entry->catchType  = extable.catch_type_index(entry_index);
2606 JVM_END
2607 
2608 
2609 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(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->exception_table_length();
2613 JVM_END
2614 
2615 
2616 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(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->access_flags().as_method_flags();
2620 JVM_END
2621 
2622 
2623 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2624   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2625   return ik->field_access_flags(field_index);
2626 JVM_END
2627 
2628 
2629 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2630   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2631   Method* method = ik->methods()->at(method_index);
2632   return method->max_locals();
2633 JVM_END
2634 
2635 
2636 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2637   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2638   Method* method = ik->methods()->at(method_index);
2639   return method->size_of_parameters();
2640 JVM_END
2641 
2642 
2643 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2644   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2645   Method* method = ik->methods()->at(method_index);
2646   return method->verifier_max_stack();
2647 JVM_END
2648 
2649 
2650 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2651   ResourceMark rm(THREAD);
2652   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2653   Method* method = ik->methods()->at(method_index);
2654   return method->is_object_constructor();
2655 JVM_END
2656 
2657 
2658 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2659   ResourceMark rm(THREAD);
2660   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2661   Method* method = ik->methods()->at(method_index);
2662   return method->is_overpass();
2663 JVM_END
2664 
2665 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2666   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2667   Method* method = ik->methods()->at(method_index);
2668   return method->name()->as_utf8();
2669 JVM_END
2670 
2671 
2672 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2673   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2674   Method* method = ik->methods()->at(method_index);
2675   return method->signature()->as_utf8();
2676 JVM_END
2677 
2678 /**
2679  * All of these JVM_GetCP-xxx methods are used by the old verifier to
2680  * read entries in the constant pool.  Since the old verifier always
2681  * works on a copy of the code, it will not see any rewriting that
2682  * may possibly occur in the middle of verification.  So it is important
2683  * that nothing it calls tries to use the cpCache instead of the raw
2684  * constant pool, so we must use cp->uncached_x methods when appropriate.
2685  */
2686 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2687   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2688   ConstantPool* cp = ik->constants();
2689   switch (cp->tag_at(cp_index).value()) {
2690     case JVM_CONSTANT_Fieldref:
2691       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2692     default:
2693       fatal("JVM_GetCPFieldNameUTF: illegal constant");
2694   }
2695   ShouldNotReachHere();
2696   return nullptr;
2697 JVM_END
2698 
2699 
2700 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2701   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2702   ConstantPool* cp = ik->constants();
2703   switch (cp->tag_at(cp_index).value()) {
2704     case JVM_CONSTANT_InterfaceMethodref:
2705     case JVM_CONSTANT_Methodref:
2706       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2707     default:
2708       fatal("JVM_GetCPMethodNameUTF: illegal constant");
2709   }
2710   ShouldNotReachHere();
2711   return nullptr;
2712 JVM_END
2713 
2714 
2715 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2716   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2717   ConstantPool* cp = ik->constants();
2718   switch (cp->tag_at(cp_index).value()) {
2719     case JVM_CONSTANT_InterfaceMethodref:
2720     case JVM_CONSTANT_Methodref:
2721       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2722     default:
2723       fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2724   }
2725   ShouldNotReachHere();
2726   return nullptr;
2727 JVM_END
2728 
2729 
2730 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2731   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2732   ConstantPool* cp = ik->constants();
2733   switch (cp->tag_at(cp_index).value()) {
2734     case JVM_CONSTANT_Fieldref:
2735       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2736     default:
2737       fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2738   }
2739   ShouldNotReachHere();
2740   return nullptr;
2741 JVM_END
2742 
2743 
2744 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2745   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2746   ConstantPool* cp = ik->constants();
2747   Symbol* classname = cp->klass_name_at(cp_index);
2748   return classname->as_utf8();
2749 JVM_END
2750 
2751 
2752 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2753   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2754   ConstantPool* cp = ik->constants();
2755   switch (cp->tag_at(cp_index).value()) {
2756     case JVM_CONSTANT_Fieldref: {
2757       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2758       Symbol* classname = cp->klass_name_at(class_index);
2759       return classname->as_utf8();
2760     }
2761     default:
2762       fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2763   }
2764   ShouldNotReachHere();
2765   return nullptr;
2766 JVM_END
2767 
2768 
2769 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2770   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2771   ConstantPool* cp = ik->constants();
2772   switch (cp->tag_at(cp_index).value()) {
2773     case JVM_CONSTANT_Methodref:
2774     case JVM_CONSTANT_InterfaceMethodref: {
2775       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2776       Symbol* classname = cp->klass_name_at(class_index);
2777       return classname->as_utf8();
2778     }
2779     default:
2780       fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2781   }
2782   ShouldNotReachHere();
2783   return nullptr;
2784 JVM_END
2785 
2786 
2787 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2788   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2789   InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2790   ConstantPool* cp = ik->constants();
2791   ConstantPool* cp_called = ik_called->constants();
2792   switch (cp->tag_at(cp_index).value()) {
2793     case JVM_CONSTANT_Fieldref: {
2794       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2795       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2796       for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2797         if (fs.name() == name && fs.signature() == signature) {
2798           return fs.access_flags().as_field_flags();
2799         }
2800       }
2801       return -1;
2802     }
2803     default:
2804       fatal("JVM_GetCPFieldModifiers: illegal constant");
2805   }
2806   ShouldNotReachHere();
2807   return 0;
2808 JVM_END
2809 
2810 
2811 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2812   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2813   InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2814   ConstantPool* cp = ik->constants();
2815   switch (cp->tag_at(cp_index).value()) {
2816     case JVM_CONSTANT_Methodref:
2817     case JVM_CONSTANT_InterfaceMethodref: {
2818       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2819       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2820       Array<Method*>* methods = ik_called->methods();
2821       int methods_count = methods->length();
2822       for (int i = 0; i < methods_count; i++) {
2823         Method* method = methods->at(i);
2824         if (method->name() == name && method->signature() == signature) {
2825             return method->access_flags().as_method_flags();
2826         }
2827       }
2828       return -1;
2829     }
2830     default:
2831       fatal("JVM_GetCPMethodModifiers: illegal constant");
2832   }
2833   ShouldNotReachHere();
2834   return 0;
2835 JVM_END
2836 
2837 
2838 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2839 
2840 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2841   // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2842 JVM_END
2843 
2844 
2845 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2846   oop class1_mirror = JNIHandles::resolve_non_null(class1);
2847   oop class2_mirror = JNIHandles::resolve_non_null(class2);
2848   Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2849   Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2850   return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2851 JVM_END
2852 
2853 // Printing support //////////////////////////////////////////////////
2854 extern "C" {
2855 
2856 ATTRIBUTE_PRINTF(3, 0)
2857 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2858   // Reject count values that are negative signed values converted to
2859   // unsigned; see bug 4399518, 4417214
2860   if ((intptr_t)count <= 0) return -1;
2861 
2862   int result = os::vsnprintf(str, count, fmt, args);
2863   if (result > 0 && (size_t)result >= count) {
2864     result = -1;
2865   }
2866 
2867   return result;
2868 }
2869 
2870 ATTRIBUTE_PRINTF(3, 4)
2871 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2872   va_list args;
2873   int len;
2874   va_start(args, fmt);
2875   len = jio_vsnprintf(str, count, fmt, args);
2876   va_end(args);
2877   return len;
2878 }
2879 
2880 ATTRIBUTE_PRINTF(2, 3)
2881 int jio_fprintf(FILE* f, const char *fmt, ...) {
2882   int len;
2883   va_list args;
2884   va_start(args, fmt);
2885   len = jio_vfprintf(f, fmt, args);
2886   va_end(args);
2887   return len;
2888 }
2889 
2890 ATTRIBUTE_PRINTF(2, 0)
2891 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2892   if (Arguments::vfprintf_hook() != nullptr) {
2893      return Arguments::vfprintf_hook()(f, fmt, args);
2894   } else {
2895     return vfprintf(f, fmt, args);
2896   }
2897 }
2898 
2899 ATTRIBUTE_PRINTF(1, 2)
2900 JNIEXPORT int jio_printf(const char *fmt, ...) {
2901   int len;
2902   va_list args;
2903   va_start(args, fmt);
2904   len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2905   va_end(args);
2906   return len;
2907 }
2908 
2909 // HotSpot specific jio method
2910 void jio_print(const char* s, size_t len) {
2911   // Try to make this function as atomic as possible.
2912   if (Arguments::vfprintf_hook() != nullptr) {
2913     jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2914   } else {
2915     // Make an unused local variable to avoid warning from gcc compiler.
2916     bool dummy = os::write(defaultStream::output_fd(), s, len);
2917   }
2918 }
2919 
2920 } // Extern C
2921 
2922 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2923 
2924 // In most of the JVM thread support functions we need to access the
2925 // thread through a ThreadsListHandle to prevent it from exiting and
2926 // being reclaimed while we try to operate on it. The exceptions to this
2927 // rule are when operating on the current thread, or if the monitor of
2928 // the target java.lang.Thread is locked at the Java level - in both
2929 // cases the target cannot exit.
2930 
2931 static void thread_entry(JavaThread* thread, TRAPS) {
2932   HandleMark hm(THREAD);
2933   Handle obj(THREAD, thread->threadObj());
2934   JavaValue result(T_VOID);
2935   JavaCalls::call_virtual(&result,
2936                           obj,
2937                           vmClasses::Thread_klass(),
2938                           vmSymbols::run_method_name(),
2939                           vmSymbols::void_method_signature(),
2940                           THREAD);
2941 }
2942 
2943 
2944 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2945 #if INCLUDE_CDS
2946   if (CDSConfig::allow_only_single_java_thread()) {
2947     // During java -Xshare:dump, if we allow multiple Java threads to
2948     // execute in parallel, symbols and classes may be loaded in
2949     // random orders which will make the resulting CDS archive
2950     // non-deterministic.
2951     //
2952     // Lucikly, during java -Xshare:dump, it's important to run only
2953     // the code in the main Java thread (which is NOT started here) that
2954     // creates the module graph, etc. It's safe to not start the other
2955     // threads which are launched by class static initializers
2956     // (ReferenceHandler, FinalizerThread and CleanerImpl).
2957     if (log_is_enabled(Info, aot)) {
2958       ResourceMark rm;
2959       oop t = JNIHandles::resolve_non_null(jthread);
2960       log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2961     }
2962     return;
2963   }
2964 #endif
2965   JavaThread *native_thread = nullptr;
2966 
2967   // We cannot hold the Threads_lock when we throw an exception,
2968   // due to rank ordering issues. Example:  we might need to grab the
2969   // Heap_lock while we construct the exception.
2970   bool throw_illegal_thread_state = false;
2971 
2972   // We must release the Threads_lock before we can post a jvmti event
2973   // in Thread::start.
2974   {
2975     ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2976     // Ensure that the C++ Thread and OSThread structures aren't freed before
2977     // we operate.
2978     MutexLocker ml(Threads_lock);
2979 
2980     // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2981     // re-starting an already started thread, so we should usually find
2982     // that the JavaThread is null. However for a JNI attached thread
2983     // there is a small window between the Thread object being created
2984     // (with its JavaThread set) and the update to its threadStatus, so we
2985     // have to check for this
2986     if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2987       throw_illegal_thread_state = true;
2988     } else {
2989       jlong size =
2990              java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2991       // Allocate the C++ Thread structure and create the native thread.  The
2992       // stack size retrieved from java is 64-bit signed, but the constructor takes
2993       // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2994       //  - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2995       //  - Avoid passing negative values which would result in really large stacks.
2996       NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2997       size_t sz = size > 0 ? (size_t) size : 0;
2998       native_thread = new JavaThread(&thread_entry, sz);
2999 
3000       // At this point it may be possible that no osthread was created for the
3001       // JavaThread due to lack of memory. Check for this situation and throw
3002       // an exception if necessary. Eventually we may want to change this so
3003       // that we only grab the lock if the thread was created successfully -
3004       // then we can also do this check and throw the exception in the
3005       // JavaThread constructor.
3006       if (native_thread->osthread() != nullptr) {
3007         // Note: the current thread is not being used within "prepare".
3008         native_thread->prepare(jthread);
3009       }
3010     }
3011   }
3012 
3013   if (throw_illegal_thread_state) {
3014     THROW(vmSymbols::java_lang_IllegalThreadStateException());
3015   }
3016 
3017   assert(native_thread != nullptr, "Starting null thread?");
3018 
3019   if (native_thread->osthread() == nullptr) {
3020     ResourceMark rm(thread);
3021     log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
3022                             JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
3023     // No one should hold a reference to the 'native_thread'.
3024     native_thread->smr_delete();
3025     if (JvmtiExport::should_post_resource_exhausted()) {
3026       JvmtiExport::post_resource_exhausted(
3027         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3028         os::native_thread_creation_failed_msg());
3029     }
3030     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3031               os::native_thread_creation_failed_msg());
3032   }
3033 
3034   JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3035 
3036   Thread::start(native_thread);
3037 
3038 JVM_END
3039 
3040 
3041 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3042   ThreadsListHandle tlh(thread);
3043   oop java_thread = nullptr;
3044   JavaThread* receiver = nullptr;
3045   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3046   java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3047 
3048   if (is_alive) {
3049     // jthread refers to a live JavaThread.
3050     Thread::set_priority(receiver, (ThreadPriority)prio);
3051   }
3052   // Implied else: If the JavaThread hasn't started yet, then the
3053   // priority set in the java.lang.Thread object above will be pushed
3054   // down when it does start.
3055 JVM_END
3056 
3057 
3058 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3059   HOTSPOT_THREAD_YIELD();
3060   os::naked_yield();
3061 JVM_END
3062 
3063 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3064   if (nanos < 0) {
3065     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3066   }
3067 
3068   if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3069     THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3070   }
3071 
3072   // Save current thread state and restore it at the end of this block.
3073   // And set new thread state to SLEEPING.
3074   JavaThreadSleepState jtss(thread);
3075 
3076   HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3077 
3078   if (nanos == 0) {
3079     os::naked_yield();
3080   } else {
3081     ThreadState old_state = thread->osthread()->get_state();
3082     thread->osthread()->set_state(SLEEPING);
3083     if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3084       // An asynchronous exception could have been thrown on
3085       // us while we were sleeping. We do not overwrite those.
3086       if (!HAS_PENDING_EXCEPTION) {
3087         HOTSPOT_THREAD_SLEEP_END(1);
3088         if (!thread->has_async_exception_condition()) {
3089           // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3090           // to properly restore the thread state.  That's likely wrong.
3091           THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3092         }
3093       }
3094     }
3095     thread->osthread()->set_state(old_state);
3096   }
3097   HOTSPOT_THREAD_SLEEP_END(0);
3098 JVM_END
3099 
3100 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3101   oop jthread = thread->threadObj();
3102   assert(jthread != nullptr, "no current carrier thread!");
3103   return JNIHandles::make_local(THREAD, jthread);
3104 JVM_END
3105 
3106 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3107   oop theThread = thread->vthread();
3108   assert(theThread != (oop)nullptr, "no current thread!");
3109   return JNIHandles::make_local(THREAD, theThread);
3110 JVM_END
3111 
3112 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3113                                      jobject theThread))
3114   oop threadObj = JNIHandles::resolve(theThread);
3115   thread->set_vthread(threadObj);
3116 
3117   // Set _monitor_owner_id of new current Thread
3118   thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3119 
3120   JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3121 JVM_END
3122 
3123 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3124   return ThreadIdentifier::unsafe_offset();
3125 JVM_END
3126 
3127 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3128   ThreadsListHandle tlh(thread);
3129   JavaThread* receiver = nullptr;
3130   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3131   if (is_alive) {
3132     // jthread refers to a live JavaThread.
3133     receiver->interrupt();
3134   }
3135 JVM_END
3136 
3137 // Return true iff the current thread has locked the object passed in
3138 
3139 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3140   if (obj == nullptr) {
3141     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3142   }
3143   Handle h_obj(THREAD, JNIHandles::resolve(obj));
3144   return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3145 JVM_END
3146 
3147 JVM_ENTRY(jobjectArray, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3148   oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3149   return (jobjectArray) JNIHandles::make_local(THREAD, trace);
3150 JVM_END
3151 
3152 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3153   oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3154   return JNIHandles::make_local(THREAD, snapshot);
3155 JVM_END
3156 
3157 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3158   // We don't use a ThreadsListHandle here because the current thread
3159   // must be alive.
3160   oop java_thread = JNIHandles::resolve_non_null(jthread);
3161   JavaThread* thr = java_lang_Thread::thread(java_thread);
3162   if (thread == thr && !thr->has_attached_via_jni()) {
3163     // Thread naming is only supported for the current thread and
3164     // we don't set the name of an attached thread to avoid stepping
3165     // on other programs.
3166     ResourceMark rm(thread);
3167     const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3168     os::set_native_thread_name(thread_name);
3169   }
3170 JVM_END
3171 
3172 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3173   oop theCache = thread->scopedValueCache();
3174   return JNIHandles::make_local(THREAD, theCache);
3175 JVM_END
3176 
3177 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3178                                        jobject theCache))
3179   arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3180   thread->set_scopedValueCache(objs);
3181 JVM_END
3182 
3183 
3184 // java.lang.Package ////////////////////////////////////////////////////////////////
3185 
3186 
3187 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3188   ResourceMark rm(THREAD);
3189   JvmtiVMObjectAllocEventCollector oam;
3190   char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3191   oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3192 return (jstring) JNIHandles::make_local(THREAD, result);
3193 JVM_END
3194 
3195 
3196 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3197   JvmtiVMObjectAllocEventCollector oam;
3198   objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3199   return (jobjectArray) JNIHandles::make_local(THREAD, result);
3200 JVM_END
3201 
3202 
3203 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3204 
3205 
3206 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3207   MonitorLocker ml(Heap_lock);
3208   oop ref = Universe::reference_pending_list();
3209   if (ref != nullptr) {
3210     Universe::clear_reference_pending_list();
3211   }
3212   return JNIHandles::make_local(THREAD, ref);
3213 JVM_END
3214 
3215 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3216   MonitorLocker ml(Heap_lock);
3217   return Universe::has_reference_pending_list();
3218 JVM_END
3219 
3220 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3221   MonitorLocker ml(Heap_lock);
3222   while (!Universe::has_reference_pending_list()) {
3223     ml.wait();
3224   }
3225 JVM_END
3226 
3227 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3228   oop ref_oop = JNIHandles::resolve_non_null(ref);
3229   // PhantomReference has its own implementation of get().
3230   assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3231   oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3232   return JNIHandles::make_local(THREAD, referent);
3233 JVM_END
3234 
3235 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3236   oop ref_oop = JNIHandles::resolve_non_null(ref);
3237   // PhantomReference has its own implementation of refersTo().
3238   // See: JVM_PhantomReferenceRefersTo
3239   assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3240   oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3241   return referent == JNIHandles::resolve(o);
3242 JVM_END
3243 
3244 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3245   oop ref_oop = JNIHandles::resolve_non_null(ref);
3246   // FinalReference has it's own implementation of clear().
3247   assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3248   if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3249     // If the referent has already been cleared then done.
3250     // However, if the referent is dead but has not yet been cleared by
3251     // concurrent reference processing, it should NOT be cleared here.
3252     // Instead, clearing should be left to the GC.  Clearing it here could
3253     // detectably lose an expected notification, which is impossible with
3254     // STW reference processing.  The clearing in enqueue() doesn't have
3255     // this problem, since the enqueue covers the notification, but it's not
3256     // worth the effort to handle that case specially.
3257     return;
3258   }
3259   java_lang_ref_Reference::clear_referent(ref_oop);
3260 JVM_END
3261 
3262 
3263 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3264 
3265 
3266 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3267   oop ref_oop = JNIHandles::resolve_non_null(ref);
3268   oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3269   return referent == JNIHandles::resolve(o);
3270 JVM_END
3271 
3272 
3273 // ObjectInputStream ///////////////////////////////////////////////////////////////
3274 
3275 // Return the first user-defined class loader up the execution stack, or null
3276 // if only code from the bootstrap or platform class loader is on the stack.
3277 
3278 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3279   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3280     InstanceKlass* ik = vfst.method()->method_holder();
3281     oop loader = ik->class_loader();
3282     if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3283       return JNIHandles::make_local(THREAD, loader);
3284     }
3285   }
3286   return nullptr;
3287 JVM_END
3288 
3289 
3290 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3291 
3292 
3293 // resolve array handle and check arguments
3294 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3295   if (arr == nullptr) {
3296     THROW_NULL(vmSymbols::java_lang_NullPointerException());
3297   }
3298   oop a = JNIHandles::resolve_non_null(arr);
3299   if (!a->is_array()) {
3300     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3301   } else if (type_array_only && !a->is_typeArray()) {
3302     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3303   }
3304   return arrayOop(a);
3305 }
3306 
3307 
3308 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3309   arrayOop a = check_array(env, arr, false, CHECK_0);
3310   return a->length();
3311 JVM_END
3312 
3313 
3314 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3315   JvmtiVMObjectAllocEventCollector oam;
3316   arrayOop a = check_array(env, arr, false, CHECK_NULL);
3317   jvalue value;
3318   BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3319   oop box = Reflection::box(&value, type, CHECK_NULL);
3320   return JNIHandles::make_local(THREAD, box);
3321 JVM_END
3322 
3323 
3324 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3325   jvalue value;
3326   value.i = 0; // to initialize value before getting used in CHECK
3327   arrayOop a = check_array(env, arr, true, CHECK_(value));
3328   assert(a->is_typeArray(), "just checking");
3329   BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3330   BasicType wide_type = (BasicType) wCode;
3331   if (type != wide_type) {
3332     Reflection::widen(&value, type, wide_type, CHECK_(value));
3333   }
3334   return value;
3335 JVM_END
3336 
3337 
3338 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3339   arrayOop a = check_array(env, arr, false, CHECK);
3340   oop box = JNIHandles::resolve(val);
3341   jvalue value;
3342   value.i = 0; // to initialize value before getting used in CHECK
3343   BasicType value_type;
3344   if (a->is_objArray()) {
3345     // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3346     value_type = Reflection::unbox_for_regular_object(box, &value);
3347   } else {
3348     value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3349   }
3350   Reflection::array_set(&value, a, index, value_type, CHECK);
3351 JVM_END
3352 
3353 
3354 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3355   arrayOop a = check_array(env, arr, true, CHECK);
3356   assert(a->is_typeArray(), "just checking");
3357   BasicType value_type = (BasicType) vCode;
3358   Reflection::array_set(&v, a, index, value_type, CHECK);
3359 JVM_END
3360 
3361 
3362 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3363   JvmtiVMObjectAllocEventCollector oam;
3364   oop element_mirror = JNIHandles::resolve(eltClass);
3365   oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3366   return JNIHandles::make_local(THREAD, result);
3367 JVM_END
3368 
3369 
3370 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3371   JvmtiVMObjectAllocEventCollector oam;
3372   arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3373   oop element_mirror = JNIHandles::resolve(eltClass);
3374   assert(dim_array->is_typeArray(), "just checking");
3375   oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3376   return JNIHandles::make_local(THREAD, result);
3377 JVM_END
3378 
3379 
3380 // Library support ///////////////////////////////////////////////////////////////////////////
3381 
3382 JVM_LEAF(void*, JVM_LoadZipLibrary())
3383   return ZipLibrary::handle();
3384 JVM_END
3385 
3386 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3387   //%note jvm_ct
3388   char ebuf[1024];
3389   void *load_result;
3390   {
3391     ThreadToNativeFromVM ttnfvm(thread);
3392     load_result = os::dll_load(name, ebuf, sizeof ebuf);
3393   }
3394   if (load_result == nullptr) {
3395     if (throwException) {
3396       char msg[1024];
3397       jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3398       // Since 'ebuf' may contain a string encoded using
3399       // platform encoding scheme, we need to pass
3400       // Exceptions::unsafe_to_utf8 to the new_exception method
3401       // as the last argument. See bug 6367357.
3402       Handle h_exception =
3403         Exceptions::new_exception(thread,
3404                                   vmSymbols::java_lang_UnsatisfiedLinkError(),
3405                                   msg, Exceptions::unsafe_to_utf8);
3406 
3407       THROW_HANDLE_NULL(h_exception);
3408     } else {
3409       log_info(library)("Failed to load library %s", name);
3410       return load_result;
3411     }
3412   }
3413   log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3414   return load_result;
3415 JVM_END
3416 
3417 
3418 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3419   os::dll_unload(handle);
3420   log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3421 JVM_END
3422 
3423 
3424 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3425   void* find_result = os::dll_lookup(handle, name);
3426   log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3427                     find_result != nullptr ? "Found" : "Failed to find",
3428                     name, p2i(handle));
3429   return find_result;
3430 JVM_END
3431 
3432 
3433 // JNI version ///////////////////////////////////////////////////////////////////////////////
3434 
3435 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3436   return Threads::is_supported_jni_version_including_1_1(version);
3437 JVM_END
3438 
3439 
3440 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3441   return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3442 JVM_END
3443 
3444 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3445   return Arguments::is_valhalla_enabled() ? JNI_TRUE : JNI_FALSE;
3446 JVM_END
3447 
3448 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3449   return VMContinuations ? JNI_TRUE : JNI_FALSE;
3450 JVM_END
3451 
3452 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3453   return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3454 JVM_END
3455 
3456 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3457   return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3458 JVM_END
3459 
3460 // String support ///////////////////////////////////////////////////////////////////////////
3461 
3462 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3463   JvmtiVMObjectAllocEventCollector oam;
3464   if (str == nullptr) return nullptr;
3465   oop string = JNIHandles::resolve_non_null(str);
3466   oop result = StringTable::intern(string, CHECK_NULL);
3467   return (jstring) JNIHandles::make_local(THREAD, result);
3468 JVM_END
3469 
3470 
3471 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3472 
3473 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3474 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3475 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3476 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3477 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3478 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3479 
3480 
3481 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3482   VM_Exit::block_if_vm_exited();
3483   return new PlatformMutex();
3484 }
3485 
3486 
3487 JNIEXPORT void JNICALL  JVM_RawMonitorDestroy(void *mon) {
3488   VM_Exit::block_if_vm_exited();
3489   delete ((PlatformMutex*) mon);
3490 }
3491 
3492 
3493 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3494   VM_Exit::block_if_vm_exited();
3495   ((PlatformMutex*) mon)->lock();
3496   return 0;
3497 }
3498 
3499 
3500 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3501   VM_Exit::block_if_vm_exited();
3502   ((PlatformMutex*) mon)->unlock();
3503 }
3504 
3505 
3506 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3507 
3508 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3509                                     Handle loader, jboolean throwError, TRAPS) {
3510   Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3511 
3512   // Check if we should initialize the class
3513   if (init && klass->is_instance_klass()) {
3514     klass->initialize(CHECK_NULL);
3515   }
3516   return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3517 }
3518 
3519 
3520 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3521 
3522 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3523   Handle method_handle;
3524   if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3525     method_handle = Handle(THREAD, JNIHandles::resolve(method));
3526     Handle receiver(THREAD, JNIHandles::resolve(obj));
3527     objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3528     assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3529 
3530     oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3531     jobject res = JNIHandles::make_local(THREAD, result);
3532     if (JvmtiExport::should_post_vm_object_alloc()) {
3533       oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3534       assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3535       if (java_lang_Class::is_primitive(ret_type)) {
3536         // Only for primitive type vm allocates memory for java object.
3537         // See box() method.
3538         JvmtiExport::post_vm_object_alloc(thread, result);
3539       }
3540     }
3541     return res;
3542   } else {
3543     THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3544   }
3545 JVM_END
3546 
3547 
3548 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3549   objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3550   assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3551   oop constructor_mirror = JNIHandles::resolve(c);

3552   oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3553   jobject res = JNIHandles::make_local(THREAD, result);
3554   if (JvmtiExport::should_post_vm_object_alloc()) {
3555     JvmtiExport::post_vm_object_alloc(thread, result);
3556   }
3557   return res;
3558 JVM_END
3559 
3560 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3561   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3562   HeapShared::initialize_from_archived_subgraph(THREAD, k);
3563 JVM_END
3564 
3565 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3566                                               jclass caller,
3567                                               jstring interfaceMethodName,
3568                                               jobject factoryType,
3569                                               jobject interfaceMethodType,
3570                                               jobject implementationMember,
3571                                               jobject dynamicMethodType,
3572                                               jclass lambdaProxyClass))
3573 #if INCLUDE_CDS
3574   if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3575     return;
3576   }
3577 
3578   InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3579   if (caller_ik->is_hidden()) {
3580     // Hidden classes not of type lambda proxy classes are currently not being archived.
3581     // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3582     // registered for archiving.
3583     return;
3584   }
3585   InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3586   assert(lambda_ik->is_hidden(), "must be a hidden class");
3587   assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3588 
3589   Symbol* interface_method_name = nullptr;
3590   if (interfaceMethodName != nullptr) {
3591     interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3592   }
3593   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3594   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3595 
3596   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3597   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3598 
3599   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3600   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3601   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3602 
3603   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3604   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3605 
3606   LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3607                                                      interface_method_type, m, dynamic_method_type, THREAD);
3608 #endif // INCLUDE_CDS
3609 JVM_END
3610 
3611 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3612                                                         jclass caller,
3613                                                         jstring interfaceMethodName,
3614                                                         jobject factoryType,
3615                                                         jobject interfaceMethodType,
3616                                                         jobject implementationMember,
3617                                                         jobject dynamicMethodType))
3618 #if INCLUDE_CDS
3619 
3620   if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3621       implementationMember == nullptr || dynamicMethodType == nullptr) {
3622     THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3623   }
3624 
3625   InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3626   if (!caller_ik->in_aot_cache()) {
3627     // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3628     return nullptr;
3629   }
3630 
3631   Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3632   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3633   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3634 
3635   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3636   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3637 
3638   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3639   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3640   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3641 
3642   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3643   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3644 
3645   InstanceKlass* loaded_lambda =
3646     LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3647                                                                interface_method_type, m, dynamic_method_type,
3648                                                                CHECK_(nullptr));
3649   return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3650 #else
3651   return nullptr;
3652 #endif // INCLUDE_CDS
3653 JVM_END
3654 
3655 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3656   if (CDSConfig::is_dumping_static_archive()) {
3657     // We do this so that the default CDS archive can be deterministic.
3658     const char* release = VM_Version::vm_release();
3659     const char* dbg_level = VM_Version::jdk_debug_level();
3660     const char* version = VM_Version::internal_vm_info_string();
3661     jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3662                          java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3663                          java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3664     seed += (jlong)VM_Version::vm_major_version();
3665     seed += (jlong)VM_Version::vm_minor_version();
3666     seed += (jlong)VM_Version::vm_security_version();
3667     seed += (jlong)VM_Version::vm_patch_version();
3668     if (seed == 0) { // don't let this ever be zero.
3669       seed = 0x87654321;
3670     }
3671     log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3672     return seed;
3673   } else {
3674     return 0;
3675   }
3676 JVM_END
3677 
3678 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3679   return CDSConfig::get_status();
3680 JVM_END
3681 
3682 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3683 #if INCLUDE_CDS
3684   assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3685   if (line != nullptr) {
3686     ResourceMark rm(THREAD);
3687     Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3688     char* c_line = java_lang_String::as_utf8_string(h_line());
3689     if (CDSConfig::is_dumping_dynamic_archive()) {
3690       // Note: LambdaFormInvokers::append take same format which is not
3691       // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3692       LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3693     }
3694     if (ClassListWriter::is_enabled()) {
3695       ClassListWriter w;
3696       w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3697     }
3698   }
3699 #endif // INCLUDE_CDS
3700 JVM_END
3701 
3702 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3703 #if INCLUDE_CDS
3704   ResourceMark rm(THREAD);
3705   Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3706   char* file_name  = java_lang_String::as_utf8_string(file_handle());
3707   AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3708 #endif // INCLUDE_CDS
3709 JVM_END
3710 
3711 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3712 #if INCLUDE_CDS
3713   ResourceMark rm(THREAD);
3714   Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3715   char* archive_name  = java_lang_String::as_utf8_string(file_handle());
3716   DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3717 #endif // INCLUDE_CDS
3718 JVM_END
3719 
3720 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3721 #if INCLUDE_CDS
3722   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3723   if (!k->is_instance_klass()) {
3724     return false;
3725   } else {
3726     if (InstanceKlass::cast(k)->is_enum_subclass() ||
3727         AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3728       // This class will be cached in AOT-initialized state. No need for init barriers.
3729       return false;
3730     } else {
3731       // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3732       // must emit barriers to ensure class initialization during production run.
3733       ResourceMark rm(THREAD);
3734       log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3735       return true;
3736     }
3737   }
3738 #else
3739   return false;
3740 #endif // INCLUDE_CDS
3741 JVM_END
3742 
3743 // Returns an array of all live Thread objects (VM internal JavaThreads,
3744 // jvmti agent threads, and JNI attaching threads  are skipped)
3745 // See CR 6404306 regarding JNI attaching threads
3746 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3747   ResourceMark rm(THREAD);
3748   ThreadsListEnumerator tle(THREAD, false, false);
3749   JvmtiVMObjectAllocEventCollector oam;
3750 
3751   int num_threads = tle.num_threads();
3752   objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3753   objArrayHandle threads_ah(THREAD, r);
3754 
3755   for (int i = 0; i < num_threads; i++) {
3756     Handle h = tle.get_threadObj(i);
3757     threads_ah->obj_at_put(i, h());
3758   }
3759 
3760   return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3761 JVM_END
3762 
3763 
3764 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3765 // Return StackTraceElement[][], each element is the stack trace of a thread in
3766 // the corresponding entry in the given threads array
3767 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3768   JvmtiVMObjectAllocEventCollector oam;
3769 
3770   // Check if threads is null
3771   if (threads == nullptr) {
3772     THROW_NULL(vmSymbols::java_lang_NullPointerException());
3773   }
3774 
3775   refArrayOop a = oop_cast<refArrayOop>(JNIHandles::resolve_non_null(threads));
3776   refArrayHandle ah(THREAD, a);
3777   int num_threads = ah->length();
3778   // check if threads is non-empty array
3779   if (num_threads == 0) {
3780     THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3781   }
3782 
3783   // check if threads is not an array of objects of Thread class
3784   Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3785   if (k != vmClasses::Thread_klass()) {
3786     THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3787   }
3788 
3789   ResourceMark rm(THREAD);
3790 
3791   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3792   for (int i = 0; i < num_threads; i++) {
3793     oop thread_obj = ah->obj_at(i);
3794     instanceHandle h(THREAD, (instanceOop) thread_obj);
3795     thread_handle_array->append(h);
3796   }
3797 
3798   // The JavaThread references in thread_handle_array are validated
3799   // in VM_ThreadDump::doit().
3800   Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3801   return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3802 
3803 JVM_END
3804 
3805 // JVM monitoring and management support
3806 JVM_LEAF(void*, JVM_GetManagement(jint version))
3807   return Management::get_jmm_interface(version);
3808 JVM_END
3809 
3810 // com.sun.tools.attach.VirtualMachine agent properties support
3811 //
3812 // Initialize the agent properties with the properties maintained in the VM
3813 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3814   ResourceMark rm;
3815 
3816   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3817 
3818   PUTPROP(props, "sun.java.command", Arguments::java_command());
3819   PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3820   PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3821   return properties;
3822 JVM_END
3823 
3824 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3825 {
3826   JvmtiVMObjectAllocEventCollector oam;
3827 
3828   if (ofClass == nullptr) {
3829     return nullptr;
3830   }
3831   Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3832   // Special handling for primitive objects
3833   if (java_lang_Class::is_primitive(mirror())) {
3834     return nullptr;
3835   }
3836   Klass* k = java_lang_Class::as_Klass(mirror());
3837   if (!k->is_instance_klass()) {
3838     return nullptr;
3839   }
3840   InstanceKlass* ik = InstanceKlass::cast(k);
3841   int encl_method_class_idx = ik->enclosing_method_class_index();
3842   if (encl_method_class_idx == 0) {
3843     return nullptr;
3844   }
3845   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3846   objArrayHandle dest(THREAD, dest_o);
3847   Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3848   dest->obj_at_put(0, enc_k->java_mirror());
3849   int encl_method_method_idx = ik->enclosing_method_method_index();
3850   if (encl_method_method_idx != 0) {
3851     Symbol* sym = ik->constants()->symbol_at(
3852                         extract_low_short_from_int(
3853                           ik->constants()->name_and_type_at(encl_method_method_idx)));
3854     Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3855     dest->obj_at_put(1, str());
3856     sym = ik->constants()->symbol_at(
3857               extract_high_short_from_int(
3858                 ik->constants()->name_and_type_at(encl_method_method_idx)));
3859     str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3860     dest->obj_at_put(2, str());
3861   }
3862   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3863 }
3864 JVM_END
3865 
3866 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3867 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3868   ResourceMark rm(THREAD);
3869 
3870   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3871     return nullptr;
3872   }
3873 
3874   char** vm_flags = Arguments::jvm_flags_array();
3875   char** vm_args = Arguments::jvm_args_array();
3876   int num_flags = Arguments::num_jvm_flags();
3877   int num_args = Arguments::num_jvm_args();
3878 
3879   InstanceKlass* ik = vmClasses::String_klass();
3880   objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3881   objArrayHandle result_h(THREAD, r);
3882 
3883   int index = 0;
3884   for (int j = 0; j < num_flags; j++, index++) {
3885     stringStream prefixed;
3886     prefixed.print("-XX:%s", vm_flags[j]);
3887     Handle h = java_lang_String::create_from_platform_dependent_str(prefixed.base(), CHECK_NULL);
3888     result_h->obj_at_put(index, h());
3889   }
3890   for (int i = 0; i < num_args; i++, index++) {
3891     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3892     result_h->obj_at_put(index, h());
3893   }
3894   return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3895 JVM_END
3896 
3897 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3898   return os::get_signal_number(name);
3899 JVM_END
3900 
3901 JVM_ENTRY(void, JVM_VirtualThreadEndFirstTransition(JNIEnv* env, jobject vthread))
3902   oop vt = JNIHandles::resolve_external_guard(vthread);
3903   MountUnmountDisabler::end_transition(thread, vt, true /*is_mount*/, true /*is_thread_start*/);
3904 JVM_END
3905 
3906 JVM_ENTRY(void, JVM_VirtualThreadStartFinalTransition(JNIEnv* env, jobject vthread))
3907   oop vt = JNIHandles::resolve_external_guard(vthread);
3908   MountUnmountDisabler::start_transition(thread, vt, false /*is_mount */, true /*is_thread_end*/);
3909 JVM_END
3910 
3911 JVM_ENTRY(void, JVM_VirtualThreadStartTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3912   oop vt = JNIHandles::resolve_external_guard(vthread);
3913   MountUnmountDisabler::start_transition(thread, vt, is_mount, false /*is_thread_end*/);
3914 JVM_END
3915 
3916 JVM_ENTRY(void, JVM_VirtualThreadEndTransition(JNIEnv* env, jobject vthread, jboolean is_mount))
3917   oop vt = JNIHandles::resolve_external_guard(vthread);
3918   MountUnmountDisabler::end_transition(thread, vt, is_mount, false /*is_thread_start*/);
3919 JVM_END
3920 
3921 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3922 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3923 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3924 #if INCLUDE_JVMTI
3925   if (!DoJVMTIVirtualThreadTransitions) {
3926     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3927     return;
3928   }
3929   assert(thread->is_disable_suspend() != (bool)enter,
3930          "nested or unbalanced monitor enter/exit is not allowed");
3931   thread->toggle_is_disable_suspend();
3932 #endif
3933 JVM_END
3934 
3935 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3936 #if INCLUDE_JFR
3937   freeze_result result = THREAD->last_freeze_fail_result();
3938   assert(result != freeze_ok, "sanity check");
3939   EventVirtualThreadPinned event(UNTIMED);
3940   event.set_starttime(THREAD->last_freeze_fail_time());
3941   if (event.should_commit()) {
3942     ResourceMark rm(THREAD);
3943     const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3944     THREAD->post_vthread_pinned_event(&event, str, result);
3945   }
3946 #endif
3947 JVM_END
3948 
3949 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3950   ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3951   assert(parkEvent != nullptr, "not initialized");
3952 
3953   OopHandle& list_head = ObjectMonitor::vthread_list_head();
3954   oop vthread_head = nullptr;
3955   while (true) {
3956     if (list_head.peek() != nullptr) {
3957       for (;;) {
3958         oop head = list_head.resolve();
3959         if (list_head.cmpxchg(head, nullptr) == head) {
3960           return JNIHandles::make_local(THREAD, head);
3961         }
3962       }
3963     }
3964     ThreadBlockInVM tbivm(THREAD);
3965     parkEvent->park();
3966   }
3967 JVM_END
3968 
3969 /*
3970  * Return the current class's class file version.  The low order 16 bits of the
3971  * returned jint contain the class's major version.  The high order 16 bits
3972  * contain the class's minor version.
3973  */
3974 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3975   oop mirror = JNIHandles::resolve_non_null(current);
3976   if (java_lang_Class::is_primitive(mirror)) {
3977     // return latest major version and minor version of 0.
3978     return JVM_CLASSFILE_MAJOR_VERSION;
3979   }
3980   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3981   return (ik->minor_version() << 16) | ik->major_version();
3982 JVM_END
3983 
3984 /*
3985  * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3986  * get the value will see a materialized value and not a scalar-replaced
3987  * null value.
3988  */
3989 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3990   JVM_EnsureMaterializedForStackWalk(env, value);
3991 JVM_END
3992 
3993 /*
3994  * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3995  */
3996 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3997   return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3998 JVM_END
--- EOF ---