1 /*
   2  * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "cds/aotClassInitializer.hpp"
  26 #include "cds/aotMetaspace.hpp"
  27 #include "cds/cdsConfig.hpp"
  28 #include "cds/classListParser.hpp"
  29 #include "cds/classListWriter.hpp"
  30 #include "cds/dynamicArchive.hpp"
  31 #include "cds/heapShared.hpp"
  32 #include "cds/lambdaFormInvokers.hpp"
  33 #include "cds/lambdaProxyClassDictionary.hpp"
  34 #include "classfile/classFileStream.hpp"
  35 #include "classfile/classLoader.inline.hpp"
  36 #include "classfile/classLoaderData.inline.hpp"
  37 #include "classfile/classLoadInfo.hpp"
  38 #include "classfile/javaAssertions.hpp"
  39 #include "classfile/javaClasses.inline.hpp"
  40 #include "classfile/moduleEntry.hpp"
  41 #include "classfile/modules.hpp"
  42 #include "classfile/packageEntry.hpp"
  43 #include "classfile/stringTable.hpp"
  44 #include "classfile/symbolTable.hpp"
  45 #include "classfile/systemDictionary.hpp"
  46 #include "classfile/vmClasses.hpp"
  47 #include "classfile/vmSymbols.hpp"
  48 #include "gc/shared/collectedHeap.inline.hpp"
  49 #include "interpreter/bytecode.hpp"
  50 #include "interpreter/bytecodeUtils.hpp"
  51 #include "jfr/jfrEvents.hpp"
  52 #include "jvm.h"
  53 #include "logging/log.hpp"
  54 #include "memory/oopFactory.hpp"
  55 #include "memory/referenceType.hpp"
  56 #include "memory/resourceArea.hpp"
  57 #include "memory/universe.hpp"
  58 #include "oops/access.inline.hpp"
  59 #include "oops/constantPool.hpp"
  60 #include "oops/fieldStreams.inline.hpp"
  61 #include "oops/flatArrayKlass.hpp"
  62 #include "oops/instanceKlass.hpp"
  63 #include "oops/klass.inline.hpp"
  64 #include "oops/method.hpp"
  65 #include "oops/objArrayKlass.hpp"
  66 #include "oops/objArrayOop.inline.hpp"
  67 #include "oops/oop.inline.hpp"
  68 #include "oops/recordComponent.hpp"
  69 #include "oops/refArrayOop.inline.hpp"
  70 #include "prims/foreignGlobals.hpp"
  71 #include "prims/jvm_misc.hpp"
  72 #include "prims/jvmtiExport.hpp"
  73 #include "prims/jvmtiThreadState.inline.hpp"
  74 #include "prims/stackwalk.hpp"
  75 #include "runtime/arguments.hpp"
  76 #include "runtime/atomicAccess.hpp"
  77 #include "runtime/continuation.hpp"
  78 #include "runtime/deoptimization.hpp"
  79 #include "runtime/globals_extension.hpp"
  80 #include "runtime/handles.inline.hpp"
  81 #include "runtime/handshake.hpp"
  82 #include "runtime/init.hpp"
  83 #include "runtime/interfaceSupport.inline.hpp"
  84 #include "runtime/java.hpp"
  85 #include "runtime/javaCalls.hpp"
  86 #include "runtime/javaThread.hpp"
  87 #include "runtime/jfieldIDWorkaround.hpp"
  88 #include "runtime/jniHandles.inline.hpp"
  89 #include "runtime/os.inline.hpp"
  90 #include "runtime/osThread.hpp"
  91 #include "runtime/perfData.hpp"
  92 #include "runtime/reflection.hpp"
  93 #include "runtime/synchronizer.hpp"
  94 #include "runtime/threadIdentifier.hpp"
  95 #include "runtime/threadSMR.hpp"
  96 #include "runtime/vframe.inline.hpp"
  97 #include "runtime/vm_version.hpp"
  98 #include "runtime/vmOperations.hpp"
  99 #include "services/attachListener.hpp"
 100 #include "services/management.hpp"
 101 #include "services/threadService.hpp"
 102 #include "utilities/checkedCast.hpp"
 103 #include "utilities/copy.hpp"
 104 #include "utilities/defaultStream.hpp"
 105 #include "utilities/dtrace.hpp"
 106 #include "utilities/events.hpp"
 107 #include "utilities/macros.hpp"
 108 #include "utilities/utf8.hpp"
 109 #include "utilities/zipLibrary.hpp"
 110 #if INCLUDE_CDS
 111 #include "classfile/systemDictionaryShared.hpp"
 112 #endif
 113 #if INCLUDE_JFR
 114 #include "jfr/jfr.hpp"
 115 #endif
 116 #if INCLUDE_MANAGEMENT
 117 #include "services/finalizerService.hpp"
 118 #endif
 119 #ifdef LINUX
 120 #include "osContainer_linux.hpp"
 121 #endif
 122 
 123 #include <errno.h>
 124 
 125 /*
 126   NOTE about use of any ctor or function call that can trigger a safepoint/GC:
 127   such ctors and calls MUST NOT come between an oop declaration/init and its
 128   usage because if objects are move this may cause various memory stomps, bus
 129   errors and segfaults. Here is a cookbook for causing so called "naked oop
 130   failures":
 131 
 132       JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
 133           // Object address to be held directly in mirror & not visible to GC
 134           oop mirror = JNIHandles::resolve_non_null(ofClass);
 135 
 136           // If this ctor can hit a safepoint, moving objects around, then
 137           ComplexConstructor foo;
 138 
 139           // Boom! mirror may point to JUNK instead of the intended object
 140           (some dereference of mirror)
 141 
 142           // Here's another call that may block for GC, making mirror stale
 143           MutexLocker ml(some_lock);
 144 
 145           // And here's an initializer that can result in a stale oop
 146           // all in one step.
 147           oop o = call_that_can_throw_exception(TRAPS);
 148 
 149 
 150   The solution is to keep the oop declaration BELOW the ctor or function
 151   call that might cause a GC, do another resolve to reassign the oop, or
 152   consider use of a Handle instead of an oop so there is immunity from object
 153   motion. But note that the "QUICK" entries below do not have a handlemark
 154   and thus can only support use of handles passed in.
 155 */
 156 
 157 extern void trace_class_resolution(Klass* to_class) {
 158   ResourceMark rm;
 159   int line_number = -1;
 160   const char * source_file = nullptr;
 161   const char * trace = "explicit";
 162   InstanceKlass* caller = nullptr;
 163   JavaThread* jthread = JavaThread::current();
 164   if (jthread->has_last_Java_frame()) {
 165     vframeStream vfst(jthread);
 166 
 167     // Scan up the stack skipping ClassLoader frames.
 168     Method* last_caller = nullptr;
 169 
 170     while (!vfst.at_end()) {
 171       Method* m = vfst.method();
 172       if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())) {
 173         break;
 174       }
 175       last_caller = m;
 176       vfst.next();
 177     }
 178     // if this is called from Class.forName0 and that is called from Class.forName,
 179     // then print the caller of Class.forName.  If this is Class.loadClass, then print
 180     // that caller, otherwise keep quiet since this should be picked up elsewhere.
 181     bool found_it = false;
 182     if (!vfst.at_end() &&
 183         vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 184         vfst.method()->name() == vmSymbols::forName0_name()) {
 185       vfst.next();
 186       if (!vfst.at_end() &&
 187           vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 188           vfst.method()->name() == vmSymbols::forName_name()) {
 189         vfst.next();
 190         found_it = true;
 191       }
 192     } else if (last_caller != nullptr &&
 193                last_caller->method_holder()->name() ==
 194                  vmSymbols::java_lang_ClassLoader() &&
 195                last_caller->name() == vmSymbols::loadClass_name()) {
 196       found_it = true;
 197     } else if (!vfst.at_end()) {
 198       if (vfst.method()->is_native()) {
 199         // JNI call
 200         found_it = true;
 201       }
 202     }
 203     if (found_it && !vfst.at_end()) {
 204       // found the caller
 205       caller = vfst.method()->method_holder();
 206       line_number = vfst.method()->line_number_from_bci(vfst.bci());
 207       if (line_number == -1) {
 208         // show method name if it's a native method
 209         trace = vfst.method()->name_and_sig_as_C_string();
 210       }
 211       Symbol* s = caller->source_file_name();
 212       if (s != nullptr) {
 213         source_file = s->as_C_string();
 214       }
 215     }
 216   }
 217   if (caller != nullptr) {
 218     if (to_class != caller) {
 219       const char * from = caller->external_name();
 220       const char * to = to_class->external_name();
 221       // print in a single call to reduce interleaving between threads
 222       if (source_file != nullptr) {
 223         log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
 224       } else {
 225         log_debug(class, resolve)("%s %s (%s)", from, to, trace);
 226       }
 227     }
 228   }
 229 }
 230 
 231 // java.lang.System //////////////////////////////////////////////////////////////////////
 232 
 233 
 234 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
 235   return os::javaTimeMillis();
 236 JVM_END
 237 
 238 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
 239   return os::javaTimeNanos();
 240 JVM_END
 241 
 242 // The function below is actually exposed by jdk.internal.misc.VM and not
 243 // java.lang.System, but we choose to keep it here so that it stays next
 244 // to JVM_CurrentTimeMillis and JVM_NanoTime
 245 
 246 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); //  2^32
 247 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
 248 
 249 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
 250   jlong seconds;
 251   jlong nanos;
 252 
 253   os::javaTimeSystemUTC(seconds, nanos);
 254 
 255   // We're going to verify that the result can fit in a long.
 256   // For that we need the difference in seconds between 'seconds'
 257   // and 'offset_secs' to be such that:
 258   //     |seconds - offset_secs| < (2^63/10^9)
 259   // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
 260   // which makes |seconds - offset_secs| < 2^33
 261   // and we will prefer +/- 2^32 as the maximum acceptable diff
 262   // as 2^32 has a more natural feel than 2^33...
 263   //
 264   // So if |seconds - offset_secs| >= 2^32 - we return a special
 265   // sentinel value (-1) which the caller should take as an
 266   // exception value indicating that the offset given to us is
 267   // too far from range of the current time - leading to too big
 268   // a nano adjustment. The caller is expected to recover by
 269   // computing a more accurate offset and calling this method
 270   // again. (For the record 2^32 secs is ~136 years, so that
 271   // should rarely happen)
 272   //
 273   jlong diff = seconds - offset_secs;
 274   if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
 275      return -1; // sentinel value: the offset is too far off the target
 276   }
 277 
 278   // return the adjustment. If you compute a time by adding
 279   // this number of nanoseconds along with the number of seconds
 280   // in the offset you should get the current UTC time.
 281   return (diff * (jlong)1000000000) + nanos;
 282 JVM_END
 283 
 284 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
 285                                jobject dst, jint dst_pos, jint length))
 286   // Check if we have null pointers
 287   if (src == nullptr || dst == nullptr) {
 288     THROW(vmSymbols::java_lang_NullPointerException());
 289   }
 290   arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
 291   arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
 292   assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
 293   assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
 294   // Do copy
 295   s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
 296 JVM_END
 297 
 298 
 299 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
 300   JavaValue r(T_OBJECT);
 301   // public synchronized Object put(Object key, Object value);
 302   HandleMark hm(THREAD);
 303   Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK);
 304   Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
 305   JavaCalls::call_virtual(&r,
 306                           props,
 307                           vmClasses::Properties_klass(),
 308                           vmSymbols::put_name(),
 309                           vmSymbols::object_object_object_signature(),
 310                           key_str,
 311                           value_str,
 312                           THREAD);
 313 }
 314 
 315 
 316 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
 317 
 318 /*
 319  * Return all of the system properties in a Java String array with alternating
 320  * names and values from the jvm SystemProperty.
 321  * Which includes some internal and all commandline -D defined properties.
 322  */
 323 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
 324   ResourceMark rm(THREAD);
 325   HandleMark hm(THREAD);
 326   int ndx = 0;
 327   int fixedCount = 2;
 328 
 329   SystemProperty* p = Arguments::system_properties();
 330   int count = Arguments::PropertyList_count(p);
 331 
 332   // Allocate result String array
 333   InstanceKlass* ik = vmClasses::String_klass();
 334   objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
 335   objArrayHandle result_h(THREAD, r);
 336 
 337   while (p != nullptr) {
 338     const char * key = p->key();
 339     if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
 340         const char * value = p->value();
 341         Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
 342         Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
 343         result_h->obj_at_put(ndx * 2,  key_str());
 344         result_h->obj_at_put(ndx * 2 + 1, value_str());
 345         ndx++;
 346     }
 347     p = p->next();
 348   }
 349 
 350   // Convert the -XX:MaxDirectMemorySize= command line flag
 351   // to the sun.nio.MaxDirectMemorySize property.
 352   // Do this after setting user properties to prevent people
 353   // from setting the value with a -D option, as requested.
 354   // Leave empty if not supplied
 355   if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
 356     char as_chars[256];
 357     jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
 358     Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
 359     Handle value_str  = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
 360     result_h->obj_at_put(ndx * 2,  key_str());
 361     result_h->obj_at_put(ndx * 2 + 1, value_str());
 362     ndx++;
 363   }
 364 
 365   // JVM monitoring and management support
 366   // Add the sun.management.compiler property for the compiler's name
 367   {
 368 #undef CSIZE
 369 #if defined(_LP64)
 370   #define CSIZE "64-Bit "
 371 #else
 372   #define CSIZE
 373 #endif // 64bit
 374 
 375 #if COMPILER1_AND_COMPILER2
 376     const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
 377 #else
 378 #if defined(COMPILER1)
 379     const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
 380 #elif defined(COMPILER2)
 381     const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
 382 #elif INCLUDE_JVMCI
 383     #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
 384 #else
 385     const char* compiler_name = "";
 386 #endif // compilers
 387 #endif // COMPILER1_AND_COMPILER2
 388 
 389     if (*compiler_name != '\0' &&
 390         (Arguments::mode() != Arguments::_int)) {
 391       Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
 392       Handle value_str  = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
 393       result_h->obj_at_put(ndx * 2,  key_str());
 394       result_h->obj_at_put(ndx * 2 + 1, value_str());
 395       ndx++;
 396     }
 397   }
 398 
 399   return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
 400 JVM_END
 401 
 402 
 403 /*
 404  * Return the temporary directory that the VM uses for the attach
 405  * and perf data files.
 406  *
 407  * It is important that this directory is well-known and the
 408  * same for all VM instances. It cannot be affected by configuration
 409  * variables such as java.io.tmpdir.
 410  */
 411 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
 412   HandleMark hm(THREAD);
 413   const char* temp_dir = os::get_temp_directory();
 414   Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
 415   return (jstring) JNIHandles::make_local(THREAD, h());
 416 JVM_END
 417 
 418 static void validate_array_arguments(Klass* elmClass, jint len, TRAPS) {
 419   if (len < 0) {
 420     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Array length is negative");
 421   }
 422   elmClass->initialize(CHECK);
 423   if (elmClass->is_array_klass() || elmClass->is_identity_class()) {
 424     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is not a value class");
 425   }
 426   if (elmClass->is_abstract()) {
 427     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Element class is abstract");
 428   }
 429 }
 430 
 431 JVM_ENTRY(jarray, JVM_CopyOfSpecialArray(JNIEnv *env, jarray orig, jint from, jint to))
 432   oop o = JNIHandles::resolve_non_null(orig);
 433   assert(o->is_array(), "Must be");
 434   oop array = nullptr;
 435   arrayOop org = (arrayOop)o;
 436   arrayHandle oh(THREAD, org);
 437   ObjArrayKlass* ak = ObjArrayKlass::cast(org->klass());
 438   InlineKlass* vk = InlineKlass::cast(ak->element_klass());
 439   int len = to - from;  // length of the new array
 440   if (ak->is_null_free_array_klass()) {
 441     if ((len != 0) && (from >= org->length() || to > org->length())) {
 442       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Copying of null-free array with uninitialized elements");
 443     }
 444   }
 445   if (org->is_flatArray()) {
 446     FlatArrayKlass* fak = FlatArrayKlass::cast(org->klass());
 447     LayoutKind lk = fak->layout_kind();
 448     ArrayKlass::ArrayProperties props = ArrayKlass::ArrayProperties::DEFAULT;
 449     switch(lk) {
 450       case LayoutKind::ATOMIC_FLAT:
 451         props = ArrayKlass::ArrayProperties::NULL_RESTRICTED;
 452       break;
 453       case LayoutKind::NON_ATOMIC_FLAT:
 454         props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED | ArrayKlass::ArrayProperties::NON_ATOMIC);
 455       break;
 456       case LayoutKind::NULLABLE_ATOMIC_FLAT:
 457       props = ArrayKlass::ArrayProperties::NON_ATOMIC;
 458       break;
 459       default:
 460         ShouldNotReachHere();
 461     }
 462     array = oopFactory::new_flatArray(vk, len, props, lk, CHECK_NULL);
 463     arrayHandle ah(THREAD, (arrayOop)array);
 464     int end = to < oh()->length() ? to : oh()->length();
 465     for (int i = from; i < end; i++) {
 466       void* src = ((flatArrayOop)oh())->value_at_addr(i, fak->layout_helper());
 467       void* dst = ((flatArrayOop)ah())->value_at_addr(i - from, fak->layout_helper());
 468       vk->copy_payload_to_addr(src, dst, lk, false);
 469     }
 470     array = ah();
 471   } else {
 472     ArrayKlass::ArrayProperties props = org->is_null_free_array() ? ArrayKlass::ArrayProperties::NULL_RESTRICTED : ArrayKlass::ArrayProperties::DEFAULT;
 473     array = oopFactory::new_objArray(vk, len, props,  CHECK_NULL);
 474     int end = to < oh()->length() ? to : oh()->length();
 475     for (int i = from; i < end; i++) {
 476       if (i < ((objArrayOop)oh())->length()) {
 477         ((objArrayOop)array)->obj_at_put(i - from, ((objArrayOop)oh())->obj_at(i));
 478       } else {
 479         assert(!ak->is_null_free_array_klass(), "Must be a nullable array");
 480         ((objArrayOop)array)->obj_at_put(i - from, nullptr);
 481       }
 482     }
 483   }
 484   return (jarray) JNIHandles::make_local(THREAD, array);
 485 JVM_END
 486 
 487 JVM_ENTRY(jarray, JVM_NewNullRestrictedNonAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
 488   oop mirror = JNIHandles::resolve_non_null(elmClass);
 489   oop init = JNIHandles::resolve(initVal);
 490   if (init == nullptr) {
 491     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
 492   }
 493   Handle init_h(THREAD, init);
 494   Klass* klass = java_lang_Class::as_Klass(mirror);
 495   if (klass != init_h()->klass()) {
 496     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
 497   }
 498   validate_array_arguments(klass, len, CHECK_NULL);
 499   InlineKlass* vk = InlineKlass::cast(klass);
 500   ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NON_ATOMIC | ArrayKlass::ArrayProperties::NULL_RESTRICTED);
 501   objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
 502   for (int i = 0; i < len; i++) {
 503     array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
 504   }
 505   return (jarray) JNIHandles::make_local(THREAD, array);
 506 JVM_END
 507 
 508 JVM_ENTRY(jarray, JVM_NewNullRestrictedAtomicArray(JNIEnv *env, jclass elmClass, jint len, jobject initVal))
 509   oop mirror = JNIHandles::resolve_non_null(elmClass);
 510   oop init = JNIHandles::resolve(initVal);
 511   if (init == nullptr) {
 512     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Initial value cannot be null");
 513   }
 514   Handle init_h(THREAD, init);
 515   Klass* klass = java_lang_Class::as_Klass(mirror);
 516   if (klass != init_h()->klass()) {
 517     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Type mismatch between array and initial value");
 518   }
 519   validate_array_arguments(klass, len, CHECK_NULL);
 520   InlineKlass* vk = InlineKlass::cast(klass);
 521   ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::NULL_RESTRICTED);
 522   objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
 523   for (int i = 0; i < len; i++) {
 524     array->obj_at_put(i, init_h() /*, CHECK_NULL*/ );
 525   }
 526   return (jarray) JNIHandles::make_local(THREAD, array);
 527 JVM_END
 528 
 529 JVM_ENTRY(jarray, JVM_NewNullableAtomicArray(JNIEnv *env, jclass elmClass, jint len))
 530   oop mirror = JNIHandles::resolve_non_null(elmClass);
 531   Klass* klass = java_lang_Class::as_Klass(mirror);
 532   klass->initialize(CHECK_NULL);
 533   validate_array_arguments(klass, len, CHECK_NULL);
 534   InlineKlass* vk = InlineKlass::cast(klass);
 535   ArrayKlass::ArrayProperties props = (ArrayKlass::ArrayProperties)(ArrayKlass::ArrayProperties::DEFAULT);
 536   objArrayOop array = oopFactory::new_objArray(klass, len, props, CHECK_NULL);
 537   return (jarray) JNIHandles::make_local(THREAD, array);
 538 JVM_END
 539 
 540 JVM_ENTRY(jboolean, JVM_IsFlatArray(JNIEnv *env, jobject obj))
 541   arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
 542   return oop->is_flatArray();
 543 JVM_END
 544 
 545 JVM_ENTRY(jboolean, JVM_IsNullRestrictedArray(JNIEnv *env, jobject obj))
 546   arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
 547   return oop->is_null_free_array();
 548 JVM_END
 549 
 550 JVM_ENTRY(jboolean, JVM_IsAtomicArray(JNIEnv *env, jobject obj))
 551   // There are multiple cases where an array can/must support atomic access:
 552   //   - the array is a reference array
 553   //   - the array uses an atomic flat layout: NULLABLE_ATOMIC_FLAT or ATOMIC_FLAT
 554   //   - the array is flat and its component type is naturally atomic
 555   arrayOop oop = arrayOop(JNIHandles::resolve_non_null(obj));
 556   if (oop->is_refArray()) return true;
 557   if (oop->is_flatArray()) {
 558     FlatArrayKlass* fak = FlatArrayKlass::cast(oop->klass());
 559     if (fak->layout_kind() == LayoutKind::ATOMIC_FLAT || fak->layout_kind() == LayoutKind::NULLABLE_ATOMIC_FLAT) {
 560       return true;
 561     }
 562     if (fak->element_klass()->is_naturally_atomic()) return true;
 563   }
 564   return false;
 565 JVM_END
 566 
 567 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
 568 
 569 extern volatile jint vm_created;
 570 
 571 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
 572   EventShutdown event;
 573   if (event.should_commit()) {
 574     event.set_reason("Shutdown requested from Java");
 575     event.commit();
 576   }
 577 JVM_END
 578 
 579 
 580 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
 581   before_exit(thread, true);
 582   vm_exit(code);
 583 JVM_END
 584 
 585 
 586 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
 587   if (!DisableExplicitGC) {
 588     EventSystemGC event;
 589     event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
 590     Universe::heap()->collect(GCCause::_java_lang_system_gc);
 591     event.commit();
 592   }
 593 JVM_END
 594 
 595 
 596 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
 597   return Universe::heap()->millis_since_last_whole_heap_examined();
 598 JVM_END
 599 
 600 
 601 static inline jlong convert_size_t_to_jlong(size_t val) {
 602   // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
 603   NOT_LP64 (return (jlong)val;)
 604   LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
 605 }
 606 
 607 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
 608   size_t n = Universe::heap()->capacity();
 609   return convert_size_t_to_jlong(n);
 610 JVM_END
 611 
 612 
 613 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
 614   size_t n = Universe::heap()->unused();
 615   return convert_size_t_to_jlong(n);
 616 JVM_END
 617 
 618 
 619 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
 620   size_t n = Universe::heap()->max_capacity();
 621   return convert_size_t_to_jlong(n);
 622 JVM_END
 623 
 624 
 625 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
 626   return os::active_processor_count();
 627 JVM_END
 628 
 629 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
 630 #ifdef LINUX
 631   if (UseContainerSupport) {
 632     return JNI_TRUE;
 633   }
 634 #endif
 635   return JNI_FALSE;
 636 JVM_END
 637 
 638 JVM_LEAF(jboolean, JVM_IsContainerized(void))
 639 #ifdef LINUX
 640   if (OSContainer::is_containerized()) {
 641     return JNI_TRUE;
 642   }
 643 #endif
 644   return JNI_FALSE;
 645 JVM_END
 646 
 647 // java.lang.Throwable //////////////////////////////////////////////////////
 648 
 649 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
 650   Handle exception(thread, JNIHandles::resolve_non_null(receiver));
 651   java_lang_Throwable::fill_in_stack_trace(exception);
 652 JVM_END
 653 
 654 // java.lang.NullPointerException ///////////////////////////////////////////
 655 
 656 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
 657   if (!ShowCodeDetailsInExceptionMessages) return nullptr;
 658 
 659   oop exc = JNIHandles::resolve_non_null(throwable);
 660 
 661   Method* method;
 662   int bci;
 663   if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
 664     return nullptr;
 665   }
 666   if (method->is_native()) {
 667     return nullptr;
 668   }
 669 
 670   stringStream ss;
 671   bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
 672   if (ok) {
 673     oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
 674     return (jstring) JNIHandles::make_local(THREAD, result);
 675   } else {
 676     return nullptr;
 677   }
 678 JVM_END
 679 
 680 // java.lang.StackTraceElement //////////////////////////////////////////////
 681 
 682 
 683 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
 684   Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
 685   objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
 686   objArrayHandle stack_trace(THREAD, st);
 687   // Fill in the allocated stack trace
 688   java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
 689 JVM_END
 690 
 691 
 692 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
 693   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
 694   Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
 695   java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
 696 JVM_END
 697 
 698 
 699 // java.lang.StackWalker //////////////////////////////////////////////////////
 700 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
 701   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
 702 
 703   bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
 704   bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
 705   Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
 706   if (!have_name) {
 707     oop name = StringTable::intern(method->name(), CHECK);
 708     java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
 709   }
 710   if (!have_type) {
 711     Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
 712     java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
 713   }
 714 JVM_END
 715 
 716 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
 717                                      jint skip_frames, jobject contScope, jobject cont,
 718                                      jint buffer_size, jint start_index, jobjectArray frames))
 719   if (!thread->has_last_Java_frame()) {
 720     THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
 721   }
 722 
 723   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 724   Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
 725   Handle cont_h(THREAD, JNIHandles::resolve(cont));
 726   // frames array is a ClassFrameInfo[] array when only getting caller reference,
 727   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 728   // be null.
 729   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 730   objArrayHandle frames_array_h(THREAD, fa);
 731 
 732   if (frames_array_h->length() < buffer_size) {
 733     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
 734   }
 735 
 736   oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
 737                                buffer_size, start_index, frames_array_h, CHECK_NULL);
 738   return JNIHandles::make_local(THREAD, result);
 739 JVM_END
 740 
 741 
 742 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
 743                                   jint last_batch_count, jint buffer_size, jint start_index,
 744                                   jobjectArray frames))
 745   // frames array is a ClassFrameInfo[] array when only getting caller reference,
 746   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 747   // be null.
 748   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 749   objArrayHandle frames_array_h(THREAD, fa);
 750 
 751   if (frames_array_h->length() < buffer_size) {
 752     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
 753   }
 754 
 755   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 756   return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
 757                                   start_index, frames_array_h, THREAD);
 758 JVM_END
 759 
 760 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
 761   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 762   objArrayHandle frames_array_h(THREAD, fa);
 763   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 764   Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
 765 
 766   StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
 767 JVM_END
 768 
 769 // java.lang.Object ///////////////////////////////////////////////
 770 
 771 
 772 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
 773   // as implemented in the classic virtual machine; return 0 if object is null
 774   if (handle == nullptr) {
 775     return 0;
 776   }
 777   oop obj = JNIHandles::resolve_non_null(handle);
 778   if (EnableValhalla && obj->klass()->is_inline_klass()) {
 779       JavaValue result(T_INT);
 780       JavaCallArguments args;
 781       Handle ho(THREAD, obj);
 782       args.push_oop(ho);
 783       methodHandle method(THREAD, Universe::value_object_hash_code_method());
 784       JavaCalls::call(&result, method, &args, THREAD);
 785       if (HAS_PENDING_EXCEPTION) {
 786         if (!PENDING_EXCEPTION->is_a(vmClasses::Error_klass())) {
 787           Handle e(THREAD, PENDING_EXCEPTION);
 788           CLEAR_PENDING_EXCEPTION;
 789           THROW_MSG_CAUSE_(vmSymbols::java_lang_InternalError(), "Internal error in hashCode", e, false);
 790         }
 791       }
 792       return result.get_jint();
 793   } else {
 794     return checked_cast<jint>(ObjectSynchronizer::FastHashCode(THREAD, obj));
 795   }
 796 JVM_END
 797 
 798 
 799 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
 800   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 801   ObjectSynchronizer::wait(obj, ms, CHECK);
 802 JVM_END
 803 
 804 
 805 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
 806   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 807   ObjectSynchronizer::notify(obj, CHECK);
 808 JVM_END
 809 
 810 
 811 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
 812   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 813   ObjectSynchronizer::notifyall(obj, CHECK);
 814 JVM_END
 815 
 816 
 817 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
 818   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 819   Klass* klass = obj->klass();
 820   JvmtiVMObjectAllocEventCollector oam;
 821 
 822 #ifdef ASSERT
 823   // Just checking that the cloneable flag is set correct
 824   if (obj->is_array()) {
 825     guarantee(klass->is_cloneable(), "all arrays are cloneable");
 826   } else {
 827     guarantee(obj->is_instance(), "should be instanceOop");
 828     bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
 829     guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
 830   }
 831 #endif
 832 
 833   // Check if class of obj supports the Cloneable interface.
 834   // All arrays are considered to be cloneable (See JLS 20.1.5).
 835   // All j.l.r.Reference classes are considered non-cloneable.
 836   if (!klass->is_cloneable() ||
 837       (klass->is_instance_klass() &&
 838        InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
 839     ResourceMark rm(THREAD);
 840     THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
 841   }
 842 
 843   if (klass->is_inline_klass()) {
 844     // Value instances have no identity, so return the current instance instead of allocating a new one
 845     // Value classes cannot have finalizers, so the method can return immediately
 846     return JNIHandles::make_local(THREAD, obj());
 847   }
 848 
 849   // Make shallow object copy
 850   const size_t size = obj->size();
 851   oop new_obj_oop = nullptr;
 852   if (obj->is_array()) {
 853     const int length = ((arrayOop)obj())->length();
 854     new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
 855                                                    /* do_zero */ true, CHECK_NULL);
 856   } else {
 857     new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
 858   }
 859 
 860   HeapAccess<>::clone(obj(), new_obj_oop, size);
 861 
 862   Handle new_obj(THREAD, new_obj_oop);
 863   // Caution: this involves a java upcall, so the clone should be
 864   // "gc-robust" by this stage.
 865   if (klass->has_finalizer()) {
 866     assert(obj->is_instance(), "should be instanceOop");
 867     new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
 868     new_obj = Handle(THREAD, new_obj_oop);
 869   }
 870 
 871   return JNIHandles::make_local(THREAD, new_obj());
 872 JVM_END
 873 
 874 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
 875 
 876 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
 877   MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
 878 JVM_END
 879 
 880 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
 881   return InstanceKlass::is_finalization_enabled();
 882 JVM_END
 883 
 884 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
 885 
 886 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
 887   CONT_RegisterNativeMethods(env, cls);
 888 JVM_END
 889 
 890 // java.io.File ///////////////////////////////////////////////////////////////
 891 
 892 JVM_LEAF(char*, JVM_NativePath(char* path))
 893   return os::native_path(path);
 894 JVM_END
 895 
 896 
 897 // Misc. class handling ///////////////////////////////////////////////////////////
 898 
 899 
 900 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
 901   // Getting the class of the caller frame.
 902   //
 903   // The call stack at this point looks something like this:
 904   //
 905   // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
 906   // [1] [ @CallerSensitive API.method                                   ]
 907   // [.] [ (skipped intermediate frames)                                 ]
 908   // [n] [ caller                                                        ]
 909   vframeStream vfst(thread);
 910   // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
 911   for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
 912     Method* m = vfst.method();
 913     assert(m != nullptr, "sanity");
 914     switch (n) {
 915     case 0:
 916       // This must only be called from Reflection.getCallerClass
 917       if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
 918         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
 919       }
 920       // fall-through
 921     case 1:
 922       // Frame 0 and 1 must be caller sensitive.
 923       if (!m->caller_sensitive()) {
 924         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
 925       }
 926       break;
 927     default:
 928       if (!m->is_ignored_by_security_stack_walk()) {
 929         // We have reached the desired frame; return the holder class.
 930         return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
 931       }
 932       break;
 933     }
 934   }
 935   return nullptr;
 936 JVM_END
 937 
 938 
 939 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
 940   oop mirror = nullptr;
 941   BasicType t = name2type(utf);
 942   if (t != T_ILLEGAL && !is_reference_type(t)) {
 943     mirror = Universe::java_mirror(t);
 944   }
 945   if (mirror == nullptr) {
 946     THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
 947   } else {
 948     return (jclass) JNIHandles::make_local(THREAD, mirror);
 949   }
 950 JVM_END
 951 
 952 
 953 // Returns a class loaded by the bootstrap class loader; or null
 954 // if not found.  ClassNotFoundException is not thrown.
 955 // FindClassFromBootLoader is exported to the launcher for windows.
 956 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
 957                                               const char* name))
 958   // Java libraries should ensure that name is never null or illegal.
 959   if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
 960     // It's impossible to create this class;  the name cannot fit
 961     // into the constant pool.
 962     return nullptr;
 963   }
 964   assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
 965 
 966   TempNewSymbol h_name = SymbolTable::new_symbol(name);
 967   Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
 968   if (k == nullptr) {
 969     return nullptr;
 970   }
 971 
 972   if (log_is_enabled(Debug, class, resolve)) {
 973     trace_class_resolution(k);
 974   }
 975   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
 976 JVM_END
 977 
 978 // Find a class with this name in this loader, using the caller's protection domain.
 979 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
 980                                           jboolean init, jobject loader,
 981                                           jclass caller))
 982   TempNewSymbol h_name =
 983        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
 984                                            CHECK_NULL);
 985 
 986   oop loader_oop = JNIHandles::resolve(loader);
 987   oop from_class = JNIHandles::resolve(caller);
 988   Handle h_loader(THREAD, loader_oop);
 989 
 990   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 991                                                false, THREAD);
 992 
 993   if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
 994     trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
 995   }
 996   return result;
 997 JVM_END
 998 
 999 // Currently only called from the old verifier.
1000 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
1001                                          jboolean init, jclass from))
1002   TempNewSymbol h_name =
1003        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1004                                            CHECK_NULL);
1005   oop from_class_oop = JNIHandles::resolve(from);
1006   Klass* from_class = (from_class_oop == nullptr)
1007                            ? (Klass*)nullptr
1008                            : java_lang_Class::as_Klass(from_class_oop);
1009   oop class_loader = nullptr;
1010   if (from_class != nullptr) {
1011     class_loader = from_class->class_loader();
1012   }
1013   Handle h_loader(THREAD, class_loader);
1014   jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1015 
1016   if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1017     // this function is generally only used for class loading during verification.
1018     ResourceMark rm;
1019     const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1020     const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1021     log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1022   }
1023 
1024 #if INCLUDE_CDS
1025   if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1026     InstanceKlass* ik = InstanceKlass::cast(from_class);
1027     SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1028   }
1029 #endif
1030 
1031   return result;
1032 JVM_END
1033 
1034 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1035 static jclass jvm_define_class_common(const char *name,
1036                                       jobject loader, const jbyte *buf,
1037                                       jsize len, jobject pd, const char *source,
1038                                       TRAPS) {
1039   if (source == nullptr)  source = "__JVM_DefineClass__";
1040 
1041   JavaThread* jt = THREAD;
1042 
1043   PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1044                              ClassLoader::perf_define_appclass_selftime(),
1045                              ClassLoader::perf_define_appclasses(),
1046                              jt->get_thread_stat()->perf_recursion_counts_addr(),
1047                              jt->get_thread_stat()->perf_timers_addr(),
1048                              PerfClassTraceTime::DEFINE_CLASS);
1049 
1050   if (UsePerfData) {
1051     ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1052   }
1053 
1054   // Class resolution will get the class name from the .class stream if the name is null.
1055   TempNewSymbol class_name = name == nullptr ? nullptr :
1056        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1057                                            CHECK_NULL);
1058 
1059   ResourceMark rm(THREAD);
1060   ClassFileStream st((u1*)buf, len, source);
1061   Handle class_loader (THREAD, JNIHandles::resolve(loader));
1062   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1063   ClassLoadInfo cl_info(protection_domain);
1064   Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1065                                                    class_loader,
1066                                                    cl_info,
1067                                                    CHECK_NULL);
1068 
1069   if (log_is_enabled(Debug, class, resolve)) {
1070     trace_class_resolution(k);
1071   }
1072 
1073   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1074 }
1075 
1076 enum {
1077   NESTMATE              = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1078   HIDDEN_CLASS          = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1079   STRONG_LOADER_LINK    = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1080   ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1081 };
1082 
1083 /*
1084  * Define a class with the specified flags that indicates if it's a nestmate,
1085  * hidden, or strongly referenced from class loader.
1086  */
1087 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1088                                       const jbyte *buf, jsize len, jobject pd,
1089                                       jboolean init, int flags, jobject classData, TRAPS) {
1090   ResourceMark rm(THREAD);
1091 
1092   InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1093   // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1094   if (lookup_k == nullptr) {
1095     // The error message is wrong. We come here only if lookup is a primitive class
1096     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1097   }
1098 
1099   Handle class_loader (THREAD, lookup_k->class_loader());
1100 
1101   bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1102   bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1103   bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1104   bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1105 
1106   InstanceKlass* host_class = nullptr;
1107   if (is_nestmate) {
1108     host_class = lookup_k->nest_host(CHECK_NULL);
1109   }
1110 
1111   log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1112                              name,
1113                              is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1114                              is_nestmate ? host_class->external_name() : "",
1115                              is_hidden ? "hidden" : "not hidden",
1116                              is_strong ? "strong" : "weak",
1117                              vm_annotations ? "with vm annotations" : "without vm annotation");
1118 
1119   if (!is_hidden) {
1120     // classData is only applicable for hidden classes
1121     if (classData != nullptr) {
1122       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1123     }
1124     if (is_nestmate) {
1125       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1126     }
1127     if (!is_strong) {
1128       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1129     }
1130     if (vm_annotations) {
1131       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1132     }
1133     if (flags != STRONG_LOADER_LINK) {
1134       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1135                      err_msg("invalid flag 0x%x", flags));
1136     }
1137   }
1138 
1139   // Class resolution will get the class name from the .class stream if the name is null.
1140   TempNewSymbol class_name = name == nullptr ? nullptr :
1141        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1142                                            CHECK_NULL);
1143 
1144   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1145   const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1146   ClassFileStream st((u1*)buf, len, source);
1147 
1148   InstanceKlass* ik = nullptr;
1149   if (!is_hidden) {
1150     ClassLoadInfo cl_info(protection_domain);
1151     ik = SystemDictionary::resolve_from_stream(&st, class_name,
1152                                                class_loader,
1153                                                cl_info,
1154                                                CHECK_NULL);
1155 
1156     if (log_is_enabled(Debug, class, resolve)) {
1157       trace_class_resolution(ik);
1158     }
1159   } else { // hidden
1160     Handle classData_h(THREAD, JNIHandles::resolve(classData));
1161     ClassLoadInfo cl_info(protection_domain,
1162                           host_class,
1163                           classData_h,
1164                           is_hidden,
1165                           is_strong,
1166                           vm_annotations);
1167     ik = SystemDictionary::resolve_from_stream(&st, class_name,
1168                                                class_loader,
1169                                                cl_info,
1170                                                CHECK_NULL);
1171 
1172     // The hidden class loader data has been artificially been kept alive to
1173     // this point. The mirror and any instances of this class have to keep
1174     // it alive afterwards.
1175     ik->class_loader_data()->dec_keep_alive_ref_count();
1176 
1177     if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1178       ModuleEntry* module = ik->module();
1179       const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1180       log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1181                                   module_name,
1182                                   ik->external_name(),
1183                                   host_class->external_name(),
1184                                   ik->is_hidden() ? "is hidden" : "is not hidden");
1185     }
1186   }
1187 
1188   if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1189     // non-hidden class or nestmate class must be in the same package as the Lookup class
1190     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1191   }
1192 
1193   if (init) {
1194     ik->initialize(CHECK_NULL);
1195   } else {
1196     ik->link_class(CHECK_NULL);
1197   }
1198 
1199   return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1200 }
1201 
1202 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1203   return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1204 JVM_END
1205 
1206 /*
1207  * Define a class with the specified lookup class.
1208  *  lookup:  Lookup class
1209  *  name:    the name of the class
1210  *  buf:     class bytes
1211  *  len:     length of class bytes
1212  *  pd:      protection domain
1213  *  init:    initialize the class
1214  *  flags:   properties of the class
1215  *  classData: private static pre-initialized field
1216  */
1217 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1218           jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1219 
1220   if (lookup == nullptr) {
1221     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1222   }
1223 
1224   assert(buf != nullptr, "buf must not be null");
1225 
1226   return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1227 JVM_END
1228 
1229 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1230 
1231   return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1232 JVM_END
1233 
1234 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1235   ResourceMark rm(THREAD);
1236 
1237   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1238   char* str = java_lang_String::as_utf8_string(h_name());
1239 
1240   // Sanity check, don't expect null
1241   if (str == nullptr) return nullptr;
1242 
1243   // Internalize the string, converting '.' to '/' in string.
1244   char* p = (char*)str;
1245   while (*p != '\0') {
1246     if (*p == '.') {
1247       *p = '/';
1248     }
1249     p++;
1250   }
1251 
1252   const int str_len = (int)(p - str);
1253   if (str_len > Symbol::max_length()) {
1254     // It's impossible to create this class;  the name cannot fit
1255     // into the constant pool.
1256     return nullptr;
1257   }
1258   TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1259 
1260   // Security Note:
1261   //   The Java level wrapper will perform the necessary security check allowing
1262   //   us to pass the null as the initiating class loader.
1263   Handle h_loader(THREAD, JNIHandles::resolve(loader));
1264   Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1265 #if INCLUDE_CDS
1266   if (k == nullptr) {
1267     // If the class is not already loaded, try to see if it's in the shared
1268     // archive for the current classloader (h_loader).
1269     k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1270   }
1271 #endif
1272   return (k == nullptr) ? nullptr :
1273             (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1274 JVM_END
1275 
1276 // Module support //////////////////////////////////////////////////////////////////////////////
1277 
1278 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1279                                  jstring location, jobjectArray packages))
1280   Handle h_module (THREAD, JNIHandles::resolve(module));
1281   Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1282 JVM_END
1283 
1284 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1285   Handle h_module (THREAD, JNIHandles::resolve(module));
1286   Modules::set_bootloader_unnamed_module(h_module, CHECK);
1287 JVM_END
1288 
1289 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1290   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1291   Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1292   Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1293 JVM_END
1294 
1295 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1296   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1297   Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1298 JVM_END
1299 
1300 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1301   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1302   Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1303 JVM_END
1304 
1305 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1306   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1307   Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1308   Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1309 JVM_END
1310 
1311 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1312   Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1313   Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1314   Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1315 JVM_END
1316 
1317 // Reflection support //////////////////////////////////////////////////////////////////////////////
1318 
1319 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1320   assert (cls != nullptr, "illegal class");
1321   JvmtiVMObjectAllocEventCollector oam;
1322   ResourceMark rm(THREAD);
1323   HandleMark hm(THREAD);
1324   Handle java_class(THREAD, JNIHandles::resolve(cls));
1325   oop result = java_lang_Class::name(java_class, CHECK_NULL);
1326   return (jstring) JNIHandles::make_local(THREAD, result);
1327 JVM_END
1328 
1329 
1330 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1331   JvmtiVMObjectAllocEventCollector oam;
1332   oop mirror = JNIHandles::resolve_non_null(cls);
1333 
1334   // Special handling for primitive objects
1335   if (java_lang_Class::is_primitive(mirror)) {
1336     // Primitive objects does not have any interfaces
1337     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1338     return (jobjectArray) JNIHandles::make_local(THREAD, r);
1339   }
1340 
1341   Klass* klass = java_lang_Class::as_Klass(mirror);
1342   // Figure size of result array
1343   int size;
1344   if (klass->is_instance_klass()) {
1345     InstanceKlass* ik = InstanceKlass::cast(klass);
1346     size = ik->local_interfaces()->length();
1347   } else {
1348     assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1349     size = 2;
1350   }
1351 
1352   // Allocate result array
1353   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1354   objArrayHandle result (THREAD, r);
1355   // Fill in result
1356   if (klass->is_instance_klass()) {
1357     // Regular instance klass, fill in all local interfaces
1358     for (int index = 0; index < size; index++) {
1359       InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1360       result->obj_at_put(index, k->java_mirror());
1361     }
1362   } else {
1363     // All arrays implement java.lang.Cloneable and java.io.Serializable
1364     result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1365     result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1366   }
1367   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1368 JVM_END
1369 
1370 
1371 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1372   oop mirror = JNIHandles::resolve_non_null(cls);
1373   if (java_lang_Class::is_primitive(mirror)) {
1374     return JNI_FALSE;
1375   }
1376   Klass* k = java_lang_Class::as_Klass(mirror);
1377   return k->is_hidden();
1378 JVM_END
1379 
1380 class ScopedValueBindingsResolver {
1381 public:
1382   InstanceKlass* Carrier_klass;
1383   ScopedValueBindingsResolver(JavaThread* THREAD) {
1384     Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1385     Carrier_klass = InstanceKlass::cast(k);
1386   }
1387 };
1388 
1389 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1390   ResourceMark rm(THREAD);
1391   GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1392   JvmtiVMObjectAllocEventCollector oam;
1393 
1394   static ScopedValueBindingsResolver resolver(THREAD);
1395 
1396   // Iterate through Java frames
1397   vframeStream vfst(thread);
1398   for(; !vfst.at_end(); vfst.next()) {
1399     int loc = -1;
1400     // get method of frame
1401     Method* method = vfst.method();
1402 
1403     Symbol *name = method->name();
1404 
1405     InstanceKlass* holder = method->method_holder();
1406     if (name == vmSymbols::runWith_method_name()) {
1407       if (holder == vmClasses::Thread_klass()
1408           || holder == resolver.Carrier_klass) {
1409         loc = 1;
1410       }
1411     }
1412 
1413     if (loc != -1) {
1414       javaVFrame *frame = vfst.asJavaVFrame();
1415       StackValueCollection* locals = frame->locals();
1416       StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1417       Handle result = head_sv->get_obj();
1418       assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1419       if (result() != nullptr) {
1420         return JNIHandles::make_local(THREAD, result());
1421       }
1422     }
1423   }
1424 
1425   return nullptr;
1426 JVM_END
1427 
1428 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1429   JvmtiVMObjectAllocEventCollector oam;
1430   // ofClass is a reference to a java_lang_Class object. The mirror object
1431   // of an InstanceKlass
1432   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1433   if (java_lang_Class::is_primitive(ofMirror) ||
1434       ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1435     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1436     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1437   }
1438 
1439   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1440   InnerClassesIterator iter(k);
1441 
1442   if (iter.length() == 0) {
1443     // Neither an inner nor outer class
1444     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1445     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1446   }
1447 
1448   // find inner class info
1449   constantPoolHandle cp(thread, k->constants());
1450   int length = iter.length();
1451 
1452   // Allocate temp. result array
1453   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1454   objArrayHandle result (THREAD, r);
1455   int members = 0;
1456 
1457   for (; !iter.done(); iter.next()) {
1458     int ioff = iter.inner_class_info_index();
1459     int ooff = iter.outer_class_info_index();
1460 
1461     if (ioff != 0 && ooff != 0) {
1462       // Check to see if the name matches the class we're looking for
1463       // before attempting to find the class.
1464       if (cp->klass_name_at_matches(k, ooff)) {
1465         Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1466         if (outer_klass == k) {
1467            Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1468            InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1469 
1470            // Throws an exception if outer klass has not declared k as
1471            // an inner klass
1472            Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1473 
1474            result->obj_at_put(members, inner_klass->java_mirror());
1475            members++;
1476         }
1477       }
1478     }
1479   }
1480 
1481   if (members != length) {
1482     // Return array of right length
1483     objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1484     for(int i = 0; i < members; i++) {
1485       res->obj_at_put(i, result->obj_at(i));
1486     }
1487     return (jobjectArray)JNIHandles::make_local(THREAD, res);
1488   }
1489 
1490   return (jobjectArray)JNIHandles::make_local(THREAD, result());
1491 JVM_END
1492 
1493 
1494 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1495 {
1496   // ofClass is a reference to a java_lang_Class object.
1497   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1498   if (java_lang_Class::is_primitive(ofMirror)) {
1499     return nullptr;
1500   }
1501   Klass* klass = java_lang_Class::as_Klass(ofMirror);
1502   if (!klass->is_instance_klass()) {
1503     return nullptr;
1504   }
1505 
1506   bool inner_is_member = false;
1507   Klass* outer_klass
1508     = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1509   if (outer_klass == nullptr)  return nullptr;  // already a top-level class
1510   if (!inner_is_member)  return nullptr;     // a hidden class (inside a method)
1511   return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1512 }
1513 JVM_END
1514 
1515 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1516 {
1517   oop mirror = JNIHandles::resolve_non_null(cls);
1518   if (java_lang_Class::is_primitive(mirror)) {
1519     return nullptr;
1520   }
1521   Klass* klass = java_lang_Class::as_Klass(mirror);
1522   if (!klass->is_instance_klass()) {
1523     return nullptr;
1524   }
1525   InstanceKlass* k = InstanceKlass::cast(klass);
1526   int ooff = 0, noff = 0;
1527   if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1528     if (noff != 0) {
1529       constantPoolHandle i_cp(thread, k->constants());
1530       Symbol* name = i_cp->symbol_at(noff);
1531       Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1532       return (jstring) JNIHandles::make_local(THREAD, str());
1533     }
1534   }
1535   return nullptr;
1536 }
1537 JVM_END
1538 
1539 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1540   assert (cls != nullptr, "illegal class");
1541   JvmtiVMObjectAllocEventCollector oam;
1542   ResourceMark rm(THREAD);
1543   oop mirror = JNIHandles::resolve_non_null(cls);
1544   // Return null for arrays and primitives
1545   if (!java_lang_Class::is_primitive(mirror)) {
1546     Klass* k = java_lang_Class::as_Klass(mirror);
1547     if (k->is_instance_klass()) {
1548       Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1549       if (sym == nullptr) return nullptr;
1550       Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1551       return (jstring) JNIHandles::make_local(THREAD, str());
1552     }
1553   }
1554   return nullptr;
1555 JVM_END
1556 
1557 
1558 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1559   assert (cls != nullptr, "illegal class");
1560   oop mirror = JNIHandles::resolve_non_null(cls);
1561   // Return null for arrays and primitives
1562   if (!java_lang_Class::is_primitive(mirror)) {
1563     Klass* k = java_lang_Class::as_Klass(mirror);
1564     if (k->is_instance_klass()) {
1565       typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1566       return (jbyteArray) JNIHandles::make_local(THREAD, a);
1567     }
1568   }
1569   return nullptr;
1570 JVM_END
1571 
1572 
1573 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1574   // some of this code was adapted from from jni_FromReflectedField
1575 
1576   oop reflected = JNIHandles::resolve_non_null(field);
1577   oop mirror    = java_lang_reflect_Field::clazz(reflected);
1578   int slot      = java_lang_reflect_Field::slot(reflected);
1579   int modifiers = java_lang_reflect_Field::modifiers(reflected);
1580 
1581   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1582   int offset = ik->field_offset(slot);
1583 
1584   if (modifiers & JVM_ACC_STATIC) {
1585     // for static fields we only look in the current class
1586     if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1587       assert(false, "cannot find static field");
1588       return false;
1589     }
1590   } else {
1591     // for instance fields we start with the current class and work
1592     // our way up through the superclass chain
1593     if (!ik->find_field_from_offset(offset, false, &fd)) {
1594       assert(false, "cannot find instance field");
1595       return false;
1596     }
1597   }
1598   return true;
1599 }
1600 
1601 static Method* jvm_get_method_common(jobject method) {
1602   // some of this code was adapted from from jni_FromReflectedMethod
1603 
1604   oop reflected = JNIHandles::resolve_non_null(method);
1605   oop mirror    = nullptr;
1606   int slot      = 0;
1607 
1608   if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1609     mirror = java_lang_reflect_Constructor::clazz(reflected);
1610     slot   = java_lang_reflect_Constructor::slot(reflected);
1611   } else {
1612     assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1613            "wrong type");
1614     mirror = java_lang_reflect_Method::clazz(reflected);
1615     slot   = java_lang_reflect_Method::slot(reflected);
1616   }
1617   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1618 
1619   Method* m = ik->method_with_idnum(slot);
1620   assert(m != nullptr, "cannot find method");
1621   return m;  // caller has to deal with null in product mode
1622 }
1623 
1624 /* Type use annotations support (JDK 1.8) */
1625 
1626 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1627   assert (cls != nullptr, "illegal class");
1628   ResourceMark rm(THREAD);
1629   // Return null for arrays and primitives
1630   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1631     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1632     if (k->is_instance_klass()) {
1633       AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1634       if (type_annotations != nullptr) {
1635         typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1636         return (jbyteArray) JNIHandles::make_local(THREAD, a);
1637       }
1638     }
1639   }
1640   return nullptr;
1641 JVM_END
1642 
1643 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1644   assert (method != nullptr, "illegal method");
1645   // method is a handle to a java.lang.reflect.Method object
1646   Method* m = jvm_get_method_common(method);
1647   if (m == nullptr) {
1648     return nullptr;
1649   }
1650 
1651   AnnotationArray* type_annotations = m->type_annotations();
1652   if (type_annotations != nullptr) {
1653     typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1654     return (jbyteArray) JNIHandles::make_local(THREAD, a);
1655   }
1656 
1657   return nullptr;
1658 JVM_END
1659 
1660 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1661   assert (field != nullptr, "illegal field");
1662   fieldDescriptor fd;
1663   bool gotFd = jvm_get_field_common(field, fd);
1664   if (!gotFd) {
1665     return nullptr;
1666   }
1667 
1668   return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1669 JVM_END
1670 
1671 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1672   if (!cp->is_within_bounds(index)) {
1673     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1674   }
1675 }
1676 
1677 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1678 {
1679   // method is a handle to a java.lang.reflect.Method object
1680   Method* method_ptr = jvm_get_method_common(method);
1681   methodHandle mh (THREAD, method_ptr);
1682   Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1683   const int num_params = mh->method_parameters_length();
1684 
1685   if (num_params < 0) {
1686     // A -1 return value from method_parameters_length means there is no
1687     // parameter data.  Return null to indicate this to the reflection
1688     // API.
1689     assert(num_params == -1, "num_params should be -1 if it is less than zero");
1690     return (jobjectArray)nullptr;
1691   } else {
1692     // Otherwise, we return something up to reflection, even if it is
1693     // a zero-length array.  Why?  Because in some cases this can
1694     // trigger a MalformedParametersException.
1695 
1696     // make sure all the symbols are properly formatted
1697     for (int i = 0; i < num_params; i++) {
1698       MethodParametersElement* params = mh->method_parameters_start();
1699       int index = params[i].name_cp_index;
1700       constantPoolHandle cp(THREAD, mh->constants());
1701       bounds_check(cp, index, CHECK_NULL);
1702 
1703       if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1704         THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1705                        "Wrong type at constant pool index");
1706       }
1707 
1708     }
1709 
1710     objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1711     objArrayHandle result (THREAD, result_oop);
1712 
1713     for (int i = 0; i < num_params; i++) {
1714       MethodParametersElement* params = mh->method_parameters_start();
1715       // For a 0 index, give a null symbol
1716       Symbol* sym = 0 != params[i].name_cp_index ?
1717         mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1718       int flags = params[i].flags;
1719       oop param = Reflection::new_parameter(reflected_method, i, sym,
1720                                             flags, CHECK_NULL);
1721       result->obj_at_put(i, param);
1722     }
1723     return (jobjectArray)JNIHandles::make_local(THREAD, result());
1724   }
1725 }
1726 JVM_END
1727 
1728 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1729 
1730 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1731 {
1732   JvmtiVMObjectAllocEventCollector oam;
1733 
1734   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1735   // Exclude primitive types and array types
1736   if (java_lang_Class::is_primitive(ofMirror) ||
1737       java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1738     // Return empty array
1739     oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1740     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1741   }
1742 
1743   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1744   constantPoolHandle cp(THREAD, k->constants());
1745 
1746   // Ensure class is linked
1747   k->link_class(CHECK_NULL);
1748 
1749   // Allocate result
1750   int num_fields;
1751 
1752   if (publicOnly) {
1753     num_fields = 0;
1754     for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1755       if (fs.access_flags().is_public()) ++num_fields;
1756     }
1757   } else {
1758     num_fields = k->java_fields_count();
1759   }
1760 
1761   objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1762   objArrayHandle result (THREAD, r);
1763 
1764   int out_idx = 0;
1765   fieldDescriptor fd;
1766   for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1767     if (!publicOnly || fs.access_flags().is_public()) {
1768       fd.reinitialize(k, fs.to_FieldInfo());
1769       oop field = Reflection::new_field(&fd, CHECK_NULL);
1770       result->obj_at_put(out_idx, field);
1771       ++out_idx;
1772     }
1773   }
1774   assert(out_idx == num_fields, "just checking");
1775   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1776 }
1777 JVM_END
1778 
1779 // A class is a record if and only if it is final and a direct subclass of
1780 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1781 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1782 {
1783   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1784   if (k != nullptr && k->is_instance_klass()) {
1785     InstanceKlass* ik = InstanceKlass::cast(k);
1786     return ik->is_record();
1787   } else {
1788     return false;
1789   }
1790 }
1791 JVM_END
1792 
1793 // Returns an array containing the components of the Record attribute,
1794 // or null if the attribute is not present.
1795 //
1796 // Note that this function returns the components of the Record attribute
1797 // even if the class is not a record.
1798 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1799 {
1800   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1801 
1802   Array<RecordComponent*>* components = ik->record_components();
1803   if (components != nullptr) {
1804     JvmtiVMObjectAllocEventCollector oam;
1805     constantPoolHandle cp(THREAD, ik->constants());
1806     int length = components->length();
1807     assert(length >= 0, "unexpected record_components length");
1808     objArrayOop record_components =
1809       oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1810     objArrayHandle components_h (THREAD, record_components);
1811 
1812     for (int x = 0; x < length; x++) {
1813       RecordComponent* component = components->at(x);
1814       assert(component != nullptr, "unexpected null record component");
1815       oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1816       components_h->obj_at_put(x, component_oop);
1817     }
1818     return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1819   }
1820 
1821   return nullptr;
1822 }
1823 JVM_END
1824 
1825 static jobjectArray get_class_declared_methods_helper(
1826                                   JNIEnv *env,
1827                                   jclass ofClass, jboolean publicOnly,
1828                                   bool want_constructor,
1829                                   Klass* klass, TRAPS) {
1830 
1831   JvmtiVMObjectAllocEventCollector oam;
1832 
1833   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1834   // Exclude primitive types and array types
1835   if (java_lang_Class::is_primitive(ofMirror)
1836       || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1837     // Return empty array
1838     oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1839     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1840   }
1841 
1842   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1843 
1844   // Ensure class is linked
1845   k->link_class(CHECK_NULL);
1846 
1847   Array<Method*>* methods = k->methods();
1848   int methods_length = methods->length();
1849 
1850   // Save original method_idnum in case of redefinition, which can change
1851   // the idnum of obsolete methods.  The new method will have the same idnum
1852   // but if we refresh the methods array, the counts will be wrong.
1853   ResourceMark rm(THREAD);
1854   GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1855   int num_methods = 0;
1856 
1857   // Select methods matching the criteria.
1858   for (int i = 0; i < methods_length; i++) {
1859     Method* method = methods->at(i);
1860     if (want_constructor && !method->is_object_constructor()) {
1861       continue;
1862     }
1863     if (!want_constructor &&
1864         (method->is_object_constructor() || method->is_class_initializer() ||
1865          method->is_overpass())) {
1866       continue;
1867     }
1868     if (publicOnly && !method->is_public()) {
1869       continue;
1870     }
1871     idnums->push(method->method_idnum());
1872     ++num_methods;
1873   }
1874 
1875   // Allocate result
1876   objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1877   objArrayHandle result (THREAD, r);
1878 
1879   // Now just put the methods that we selected above, but go by their idnum
1880   // in case of redefinition.  The methods can be redefined at any safepoint,
1881   // so above when allocating the oop array and below when creating reflect
1882   // objects.
1883   for (int i = 0; i < num_methods; i++) {
1884     methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1885     if (method.is_null()) {
1886       // Method may have been deleted and seems this API can handle null
1887       // Otherwise should probably put a method that throws NSME
1888       result->obj_at_put(i, nullptr);
1889     } else {
1890       oop m;
1891       if (want_constructor) {
1892         assert(method->is_object_constructor(), "must be");
1893         m = Reflection::new_constructor(method, CHECK_NULL);
1894       } else {
1895         m = Reflection::new_method(method, false, CHECK_NULL);
1896       }
1897       result->obj_at_put(i, m);
1898     }
1899   }
1900 
1901   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1902 }
1903 
1904 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1905 {
1906   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1907                                            /*want_constructor*/ false,
1908                                            vmClasses::reflect_Method_klass(), THREAD);
1909 }
1910 JVM_END
1911 
1912 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1913 {
1914   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1915                                            /*want_constructor*/ true,
1916                                            vmClasses::reflect_Constructor_klass(), THREAD);
1917 }
1918 JVM_END
1919 
1920 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1921 {
1922   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1923   InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1924   return c->has_nestmate_access_to(m, THREAD);
1925 }
1926 JVM_END
1927 
1928 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1929 {
1930   // current is not a primitive or array class
1931   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1932   InstanceKlass* host = c->nest_host(THREAD);
1933   return (jclass) (host == nullptr ? nullptr :
1934                    JNIHandles::make_local(THREAD, host->java_mirror()));
1935 }
1936 JVM_END
1937 
1938 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1939 {
1940   // current is not a primitive or array class
1941   ResourceMark rm(THREAD);
1942   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1943   InstanceKlass* host = c->nest_host(THREAD);
1944 
1945   log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1946                               c->external_name(), host->external_name());
1947   {
1948     JvmtiVMObjectAllocEventCollector oam;
1949     Array<u2>* members = host->nest_members();
1950     int length = members == nullptr ? 0 : members->length();
1951 
1952     log_trace(class, nestmates)(" - host has %d listed nest members", length);
1953 
1954     // nest host is first in the array so make it one bigger
1955     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1956                                              length + 1, CHECK_NULL);
1957     objArrayHandle result(THREAD, r);
1958     result->obj_at_put(0, host->java_mirror());
1959     if (length != 0) {
1960       int count = 0;
1961       for (int i = 0; i < length; i++) {
1962         int cp_index = members->at(i);
1963         Klass* k = host->constants()->klass_at(cp_index, THREAD);
1964         if (HAS_PENDING_EXCEPTION) {
1965           if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1966             return nullptr; // propagate VMEs
1967           }
1968           if (log_is_enabled(Trace, class, nestmates)) {
1969             stringStream ss;
1970             char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1971             ss.print(" - resolution of nest member %s failed: ", target_member_class);
1972             java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1973             log_trace(class, nestmates)("%s", ss.as_string());
1974           }
1975           CLEAR_PENDING_EXCEPTION;
1976           continue;
1977         }
1978         if (k->is_instance_klass()) {
1979           InstanceKlass* ik = InstanceKlass::cast(k);
1980           InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1981           if (nest_host_k == host) {
1982             result->obj_at_put(count+1, k->java_mirror());
1983             count++;
1984             log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1985           } else {
1986             log_trace(class, nestmates)(" - skipping member %s with different host %s",
1987                                         ik->external_name(), nest_host_k->external_name());
1988           }
1989         } else {
1990           log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1991                                       k->external_name());
1992         }
1993       }
1994       if (count < length) {
1995         // we had invalid entries so we need to compact the array
1996         log_trace(class, nestmates)(" - compacting array from length %d to %d",
1997                                     length + 1, count + 1);
1998 
1999         objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2000                                                   count + 1, CHECK_NULL);
2001         objArrayHandle result2(THREAD, r2);
2002         for (int i = 0; i < count + 1; i++) {
2003           result2->obj_at_put(i, result->obj_at(i));
2004         }
2005         return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2006       }
2007     }
2008     else {
2009       assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
2010     }
2011     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2012   }
2013 }
2014 JVM_END
2015 
2016 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2017 {
2018   oop mirror = JNIHandles::resolve_non_null(current);
2019   assert(!java_lang_Class::is_primitive(mirror), "should not be");
2020   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2021 
2022   ResourceMark rm(THREAD);
2023   log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2024                            ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2025   if (ik->is_sealed()) {
2026     JvmtiVMObjectAllocEventCollector oam;
2027     Array<u2>* subclasses = ik->permitted_subclasses();
2028     int length = subclasses->length();
2029 
2030     log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2031 
2032     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2033                                              length, CHECK_NULL);
2034     objArrayHandle result(THREAD, r);
2035     int count = 0;
2036     for (int i = 0; i < length; i++) {
2037       int cp_index = subclasses->at(i);
2038       Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2039       if (HAS_PENDING_EXCEPTION) {
2040         if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2041           return nullptr; // propagate VMEs
2042         }
2043         if (log_is_enabled(Trace, class, sealed)) {
2044           stringStream ss;
2045           char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2046           ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2047           java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2048           log_trace(class, sealed)("%s", ss.as_string());
2049         }
2050 
2051         CLEAR_PENDING_EXCEPTION;
2052         continue;
2053       }
2054       if (k->is_instance_klass()) {
2055         result->obj_at_put(count++, k->java_mirror());
2056         log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2057       }
2058     }
2059     if (count < length) {
2060       // we had invalid entries so we need to compact the array
2061       objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2062                                                 count, CHECK_NULL);
2063       objArrayHandle result2(THREAD, r2);
2064       for (int i = 0; i < count; i++) {
2065         result2->obj_at_put(i, result->obj_at(i));
2066       }
2067       return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2068     }
2069     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2070   } else {
2071     return nullptr;
2072   }
2073 }
2074 JVM_END
2075 
2076 // Constant pool access //////////////////////////////////////////////////////////
2077 
2078 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2079 {
2080   JvmtiVMObjectAllocEventCollector oam;
2081   oop mirror = JNIHandles::resolve_non_null(cls);
2082   // Return null for primitives and arrays
2083   if (!java_lang_Class::is_primitive(mirror)) {
2084     Klass* k = java_lang_Class::as_Klass(mirror);
2085     if (k->is_instance_klass()) {
2086       InstanceKlass* k_h = InstanceKlass::cast(k);
2087       Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2088       reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2089       return JNIHandles::make_local(THREAD, jcp());
2090     }
2091   }
2092   return nullptr;
2093 }
2094 JVM_END
2095 
2096 
2097 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2098 {
2099   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2100   return cp->length();
2101 }
2102 JVM_END
2103 
2104 
2105 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2106 {
2107   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2108   bounds_check(cp, index, CHECK_NULL);
2109   constantTag tag = cp->tag_at(index);
2110   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2111     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2112   }
2113   Klass* k = cp->klass_at(index, CHECK_NULL);
2114   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2115 }
2116 JVM_END
2117 
2118 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2119 {
2120   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2121   bounds_check(cp, index, CHECK_NULL);
2122   constantTag tag = cp->tag_at(index);
2123   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2124     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2125   }
2126   Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2127   if (k == nullptr) return nullptr;
2128   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2129 }
2130 JVM_END
2131 
2132 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2133   constantTag tag = cp->tag_at(index);
2134   if (!tag.is_method() && !tag.is_interface_method()) {
2135     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2136   }
2137   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2138   Klass* k_o;
2139   if (force_resolution) {
2140     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2141   } else {
2142     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2143     if (k_o == nullptr) return nullptr;
2144   }
2145   InstanceKlass* k = InstanceKlass::cast(k_o);
2146   Symbol* name = cp->uncached_name_ref_at(index);
2147   Symbol* sig  = cp->uncached_signature_ref_at(index);
2148   methodHandle m (THREAD, k->find_method(name, sig));
2149   if (m.is_null()) {
2150     THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2151   }
2152   oop method;
2153   if (m->is_object_constructor()) {
2154     method = Reflection::new_constructor(m, CHECK_NULL);
2155   } else {
2156     method = Reflection::new_method(m, true, CHECK_NULL);
2157   }
2158   return JNIHandles::make_local(THREAD, method);
2159 }
2160 
2161 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2162 {
2163   JvmtiVMObjectAllocEventCollector oam;
2164   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2165   bounds_check(cp, index, CHECK_NULL);
2166   jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2167   return res;
2168 }
2169 JVM_END
2170 
2171 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2172 {
2173   JvmtiVMObjectAllocEventCollector oam;
2174   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2175   bounds_check(cp, index, CHECK_NULL);
2176   jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2177   return res;
2178 }
2179 JVM_END
2180 
2181 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2182   constantTag tag = cp->tag_at(index);
2183   if (!tag.is_field()) {
2184     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2185   }
2186   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2187   Klass* k_o;
2188   if (force_resolution) {
2189     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2190   } else {
2191     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2192     if (k_o == nullptr) return nullptr;
2193   }
2194   InstanceKlass* k = InstanceKlass::cast(k_o);
2195   Symbol* name = cp->uncached_name_ref_at(index);
2196   Symbol* sig  = cp->uncached_signature_ref_at(index);
2197   fieldDescriptor fd;
2198   Klass* target_klass = k->find_field(name, sig, &fd);
2199   if (target_klass == nullptr) {
2200     THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2201   }
2202   oop field = Reflection::new_field(&fd, CHECK_NULL);
2203   return JNIHandles::make_local(THREAD, field);
2204 }
2205 
2206 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2207 {
2208   JvmtiVMObjectAllocEventCollector oam;
2209   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2210   bounds_check(cp, index, CHECK_NULL);
2211   jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2212   return res;
2213 }
2214 JVM_END
2215 
2216 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2217 {
2218   JvmtiVMObjectAllocEventCollector oam;
2219   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2220   bounds_check(cp, index, CHECK_NULL);
2221   jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2222   return res;
2223 }
2224 JVM_END
2225 
2226 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2227 {
2228   JvmtiVMObjectAllocEventCollector oam;
2229   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2230   bounds_check(cp, index, CHECK_NULL);
2231   constantTag tag = cp->tag_at(index);
2232   if (!tag.is_field_or_method()) {
2233     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2234   }
2235   int klass_ref = cp->uncached_klass_ref_index_at(index);
2236   Symbol*  klass_name  = cp->klass_name_at(klass_ref);
2237   Symbol*  member_name = cp->uncached_name_ref_at(index);
2238   Symbol*  member_sig  = cp->uncached_signature_ref_at(index);
2239   objArrayOop  dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2240   objArrayHandle dest(THREAD, dest_o);
2241   Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2242   dest->obj_at_put(0, str());
2243   str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2244   dest->obj_at_put(1, str());
2245   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2246   dest->obj_at_put(2, str());
2247   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2248 }
2249 JVM_END
2250 
2251 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2252 {
2253   JvmtiVMObjectAllocEventCollector oam;
2254   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2255   bounds_check(cp, index, CHECK_0);
2256   constantTag tag = cp->tag_at(index);
2257   if (!tag.is_field_or_method()) {
2258     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2259   }
2260   return (jint) cp->uncached_klass_ref_index_at(index);
2261 }
2262 JVM_END
2263 
2264 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2265 {
2266   JvmtiVMObjectAllocEventCollector oam;
2267   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2268   bounds_check(cp, index, CHECK_0);
2269   constantTag tag = cp->tag_at(index);
2270   if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2271     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2272   }
2273   return (jint) cp->uncached_name_and_type_ref_index_at(index);
2274 }
2275 JVM_END
2276 
2277 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2278 {
2279   JvmtiVMObjectAllocEventCollector oam;
2280   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2281   bounds_check(cp, index, CHECK_NULL);
2282   constantTag tag = cp->tag_at(index);
2283   if (!tag.is_name_and_type()) {
2284     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2285   }
2286   Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2287   Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2288   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2289   objArrayHandle dest(THREAD, dest_o);
2290   Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2291   dest->obj_at_put(0, str());
2292   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2293   dest->obj_at_put(1, str());
2294   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2295 }
2296 JVM_END
2297 
2298 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2299 {
2300   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2301   bounds_check(cp, index, CHECK_0);
2302   constantTag tag = cp->tag_at(index);
2303   if (!tag.is_int()) {
2304     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2305   }
2306   return cp->int_at(index);
2307 }
2308 JVM_END
2309 
2310 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2311 {
2312   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2313   bounds_check(cp, index, CHECK_(0L));
2314   constantTag tag = cp->tag_at(index);
2315   if (!tag.is_long()) {
2316     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2317   }
2318   return cp->long_at(index);
2319 }
2320 JVM_END
2321 
2322 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2323 {
2324   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2325   bounds_check(cp, index, CHECK_(0.0f));
2326   constantTag tag = cp->tag_at(index);
2327   if (!tag.is_float()) {
2328     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2329   }
2330   return cp->float_at(index);
2331 }
2332 JVM_END
2333 
2334 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2335 {
2336   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2337   bounds_check(cp, index, CHECK_(0.0));
2338   constantTag tag = cp->tag_at(index);
2339   if (!tag.is_double()) {
2340     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2341   }
2342   return cp->double_at(index);
2343 }
2344 JVM_END
2345 
2346 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2347 {
2348   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2349   bounds_check(cp, index, CHECK_NULL);
2350   constantTag tag = cp->tag_at(index);
2351   if (!tag.is_string()) {
2352     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2353   }
2354   oop str = cp->string_at(index, CHECK_NULL);
2355   return (jstring) JNIHandles::make_local(THREAD, str);
2356 }
2357 JVM_END
2358 
2359 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2360 {
2361   JvmtiVMObjectAllocEventCollector oam;
2362   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2363   bounds_check(cp, index, CHECK_NULL);
2364   constantTag tag = cp->tag_at(index);
2365   if (!tag.is_symbol()) {
2366     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2367   }
2368   Symbol* sym = cp->symbol_at(index);
2369   Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2370   return (jstring) JNIHandles::make_local(THREAD, str());
2371 }
2372 JVM_END
2373 
2374 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(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);
2378   constantTag tag = cp->tag_at(index);
2379   jbyte result = tag.value();
2380   // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2381   // they are changed to the corresponding tags from the JVM spec, so that java code in
2382   // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2383   if (tag.is_klass_or_reference()) {
2384       result = JVM_CONSTANT_Class;
2385   } else if (tag.is_string_index()) {
2386       result = JVM_CONSTANT_String;
2387   } else if (tag.is_method_type_in_error()) {
2388       result = JVM_CONSTANT_MethodType;
2389   } else if (tag.is_method_handle_in_error()) {
2390       result = JVM_CONSTANT_MethodHandle;
2391   } else if (tag.is_dynamic_constant_in_error()) {
2392       result = JVM_CONSTANT_Dynamic;
2393   }
2394   return result;
2395 }
2396 JVM_END
2397 
2398 // Assertion support. //////////////////////////////////////////////////////////
2399 
2400 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2401   assert(cls != nullptr, "bad class");
2402 
2403   oop r = JNIHandles::resolve(cls);
2404   assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2405   if (java_lang_Class::is_primitive(r)) return false;
2406 
2407   Klass* k = java_lang_Class::as_Klass(r);
2408   assert(k->is_instance_klass(), "must be an instance klass");
2409   if (!k->is_instance_klass()) return false;
2410 
2411   ResourceMark rm(THREAD);
2412   const char* name = k->name()->as_C_string();
2413   bool system_class = k->class_loader() == nullptr;
2414   return JavaAssertions::enabled(name, system_class);
2415 
2416 JVM_END
2417 
2418 
2419 // Return a new AssertionStatusDirectives object with the fields filled in with
2420 // command-line assertion arguments (i.e., -ea, -da).
2421 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2422   JvmtiVMObjectAllocEventCollector oam;
2423   oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2424   return JNIHandles::make_local(THREAD, asd);
2425 JVM_END
2426 
2427 // Verification ////////////////////////////////////////////////////////////////////////////////
2428 
2429 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2430 
2431 // RedefineClasses support: bug 6214132 caused verification to fail.
2432 // All functions from this section should call the jvmtiThreadSate function:
2433 //   Klass* class_to_verify_considering_redefinition(Klass* klass).
2434 // The function returns a Klass* of the _scratch_class if the verifier
2435 // was invoked in the middle of the class redefinition.
2436 // Otherwise it returns its argument value which is the _the_class Klass*.
2437 // Please, refer to the description in the jvmtiThreadState.hpp.
2438 
2439 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2440   oop mirror = JNIHandles::resolve_non_null(cls);
2441   if (java_lang_Class::is_primitive(mirror)) {
2442     return JNI_FALSE;
2443   }
2444   Klass* k = java_lang_Class::as_Klass(mirror);
2445   // This isn't necessary since answer is the same since redefinition
2446   // has already checked this matches for the scratch class.
2447   // k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2448   jboolean result = k->is_interface();
2449   assert(!result || k->is_instance_klass(),
2450          "all interfaces are instance types");
2451   return result;
2452 JVM_END
2453 
2454 
2455 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2456   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2457   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2458   return k->name()->as_utf8();
2459 JVM_END
2460 
2461 
2462 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2463   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2464   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2465   // types will have length zero if this is not an InstanceKlass
2466   // (length is determined by call to JVM_GetClassCPEntriesCount)
2467   if (k->is_instance_klass()) {
2468     ConstantPool* cp = InstanceKlass::cast(k)->constants();
2469     for (int index = cp->length() - 1; index >= 0; index--) {
2470       constantTag tag = cp->tag_at(index);
2471       types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2472     }
2473   }
2474 JVM_END
2475 
2476 
2477 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2478   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2479   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2480   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2481 JVM_END
2482 
2483 
2484 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2485   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2486   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2487   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2488 JVM_END
2489 
2490 
2491 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2492   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2493   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2494   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2495 JVM_END
2496 
2497 
2498 // The following methods, used for the verifier, are never called with
2499 // array klasses, so a direct cast to InstanceKlass is safe.
2500 // Typically, these methods are called in a loop with bounds determined
2501 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2502 // zero for arrays.
2503 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2504   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2505   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2506   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2507   int length = method->checked_exceptions_length();
2508   if (length > 0) {
2509     CheckedExceptionElement* table= method->checked_exceptions_start();
2510     for (int i = 0; i < length; i++) {
2511       exceptions[i] = table[i].class_cp_index;
2512     }
2513   }
2514 JVM_END
2515 
2516 
2517 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2518   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2519   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2520   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2521   return method->checked_exceptions_length();
2522 JVM_END
2523 
2524 
2525 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2526   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2527   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2528   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2529   memcpy(code, method->code_base(), method->code_size());
2530 JVM_END
2531 
2532 
2533 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2534   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2535   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2536   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2537   return method->code_size();
2538 JVM_END
2539 
2540 
2541 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2542   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2543   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2544   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2545   ExceptionTable extable(method);
2546   entry->start_pc   = extable.start_pc(entry_index);
2547   entry->end_pc     = extable.end_pc(entry_index);
2548   entry->handler_pc = extable.handler_pc(entry_index);
2549   entry->catchType  = extable.catch_type_index(entry_index);
2550 JVM_END
2551 
2552 
2553 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2554   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2555   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2556   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2557   return method->exception_table_length();
2558 JVM_END
2559 
2560 
2561 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2562   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2563   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2564   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2565   return method->access_flags().as_method_flags();
2566 JVM_END
2567 
2568 
2569 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2570   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2571   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2572   return InstanceKlass::cast(k)->field_access_flags(field_index);
2573 JVM_END
2574 
2575 
2576 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2577   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2578   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2579   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2580   return method->max_locals();
2581 JVM_END
2582 
2583 
2584 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2585   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2586   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2587   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2588   return method->size_of_parameters();
2589 JVM_END
2590 
2591 
2592 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2593   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2594   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2595   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2596   return method->verifier_max_stack();
2597 JVM_END
2598 
2599 
2600 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2601   ResourceMark rm(THREAD);
2602   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2603   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2604   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2605   return method->is_object_constructor();
2606 JVM_END
2607 
2608 
2609 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2610   ResourceMark rm(THREAD);
2611   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2612   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2613   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2614   return method->is_overpass();
2615 JVM_END
2616 
2617 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2618   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2619   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2620   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2621   return method->name()->as_utf8();
2622 JVM_END
2623 
2624 
2625 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2626   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2627   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2628   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2629   return method->signature()->as_utf8();
2630 JVM_END
2631 
2632 /**
2633  * All of these JVM_GetCP-xxx methods are used by the old verifier to
2634  * read entries in the constant pool.  Since the old verifier always
2635  * works on a copy of the code, it will not see any rewriting that
2636  * may possibly occur in the middle of verification.  So it is important
2637  * that nothing it calls tries to use the cpCache instead of the raw
2638  * constant pool, so we must use cp->uncached_x methods when appropriate.
2639  */
2640 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2641   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2642   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2643   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2644   switch (cp->tag_at(cp_index).value()) {
2645     case JVM_CONSTANT_Fieldref:
2646       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2647     default:
2648       fatal("JVM_GetCPFieldNameUTF: illegal constant");
2649   }
2650   ShouldNotReachHere();
2651   return nullptr;
2652 JVM_END
2653 
2654 
2655 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2656   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2657   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2658   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2659   switch (cp->tag_at(cp_index).value()) {
2660     case JVM_CONSTANT_InterfaceMethodref:
2661     case JVM_CONSTANT_Methodref:
2662       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2663     default:
2664       fatal("JVM_GetCPMethodNameUTF: illegal constant");
2665   }
2666   ShouldNotReachHere();
2667   return nullptr;
2668 JVM_END
2669 
2670 
2671 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2672   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2673   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2674   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2675   switch (cp->tag_at(cp_index).value()) {
2676     case JVM_CONSTANT_InterfaceMethodref:
2677     case JVM_CONSTANT_Methodref:
2678       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2679     default:
2680       fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2681   }
2682   ShouldNotReachHere();
2683   return nullptr;
2684 JVM_END
2685 
2686 
2687 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2688   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2689   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2690   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2691   switch (cp->tag_at(cp_index).value()) {
2692     case JVM_CONSTANT_Fieldref:
2693       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2694     default:
2695       fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2696   }
2697   ShouldNotReachHere();
2698   return nullptr;
2699 JVM_END
2700 
2701 
2702 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2703   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2704   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2705   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2706   Symbol* classname = cp->klass_name_at(cp_index);
2707   return classname->as_utf8();
2708 JVM_END
2709 
2710 
2711 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2712   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2713   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2714   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2715   switch (cp->tag_at(cp_index).value()) {
2716     case JVM_CONSTANT_Fieldref: {
2717       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2718       Symbol* classname = cp->klass_name_at(class_index);
2719       return classname->as_utf8();
2720     }
2721     default:
2722       fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2723   }
2724   ShouldNotReachHere();
2725   return nullptr;
2726 JVM_END
2727 
2728 
2729 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2730   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2731   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2732   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2733   switch (cp->tag_at(cp_index).value()) {
2734     case JVM_CONSTANT_Methodref:
2735     case JVM_CONSTANT_InterfaceMethodref: {
2736       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2737       Symbol* classname = cp->klass_name_at(class_index);
2738       return classname->as_utf8();
2739     }
2740     default:
2741       fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2742   }
2743   ShouldNotReachHere();
2744   return nullptr;
2745 JVM_END
2746 
2747 
2748 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2749   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2750   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2751   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2752   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2753   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2754   ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2755   switch (cp->tag_at(cp_index).value()) {
2756     case JVM_CONSTANT_Fieldref: {
2757       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2758       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2759       InstanceKlass* ik = InstanceKlass::cast(k_called);
2760       for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2761         if (fs.name() == name && fs.signature() == signature) {
2762           return fs.access_flags().as_field_flags();
2763         }
2764       }
2765       return -1;
2766     }
2767     default:
2768       fatal("JVM_GetCPFieldModifiers: illegal constant");
2769   }
2770   ShouldNotReachHere();
2771   return 0;
2772 JVM_END
2773 
2774 
2775 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2776   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2777   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2778   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2779   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2780   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2781   switch (cp->tag_at(cp_index).value()) {
2782     case JVM_CONSTANT_Methodref:
2783     case JVM_CONSTANT_InterfaceMethodref: {
2784       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2785       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2786       Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2787       int methods_count = methods->length();
2788       for (int i = 0; i < methods_count; i++) {
2789         Method* method = methods->at(i);
2790         if (method->name() == name && method->signature() == signature) {
2791             return method->access_flags().as_method_flags();
2792         }
2793       }
2794       return -1;
2795     }
2796     default:
2797       fatal("JVM_GetCPMethodModifiers: illegal constant");
2798   }
2799   ShouldNotReachHere();
2800   return 0;
2801 JVM_END
2802 
2803 
2804 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2805 
2806 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2807   // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2808 JVM_END
2809 
2810 
2811 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2812   oop class1_mirror = JNIHandles::resolve_non_null(class1);
2813   oop class2_mirror = JNIHandles::resolve_non_null(class2);
2814   Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2815   Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2816   return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2817 JVM_END
2818 
2819 // Printing support //////////////////////////////////////////////////
2820 extern "C" {
2821 
2822 ATTRIBUTE_PRINTF(3, 0)
2823 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2824   // Reject count values that are negative signed values converted to
2825   // unsigned; see bug 4399518, 4417214
2826   if ((intptr_t)count <= 0) return -1;
2827 
2828   int result = os::vsnprintf(str, count, fmt, args);
2829   if (result > 0 && (size_t)result >= count) {
2830     result = -1;
2831   }
2832 
2833   return result;
2834 }
2835 
2836 ATTRIBUTE_PRINTF(3, 4)
2837 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2838   va_list args;
2839   int len;
2840   va_start(args, fmt);
2841   len = jio_vsnprintf(str, count, fmt, args);
2842   va_end(args);
2843   return len;
2844 }
2845 
2846 ATTRIBUTE_PRINTF(2, 3)
2847 int jio_fprintf(FILE* f, const char *fmt, ...) {
2848   int len;
2849   va_list args;
2850   va_start(args, fmt);
2851   len = jio_vfprintf(f, fmt, args);
2852   va_end(args);
2853   return len;
2854 }
2855 
2856 ATTRIBUTE_PRINTF(2, 0)
2857 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2858   if (Arguments::vfprintf_hook() != nullptr) {
2859      return Arguments::vfprintf_hook()(f, fmt, args);
2860   } else {
2861     return vfprintf(f, fmt, args);
2862   }
2863 }
2864 
2865 ATTRIBUTE_PRINTF(1, 2)
2866 JNIEXPORT int jio_printf(const char *fmt, ...) {
2867   int len;
2868   va_list args;
2869   va_start(args, fmt);
2870   len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2871   va_end(args);
2872   return len;
2873 }
2874 
2875 // HotSpot specific jio method
2876 void jio_print(const char* s, size_t len) {
2877   // Try to make this function as atomic as possible.
2878   if (Arguments::vfprintf_hook() != nullptr) {
2879     jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2880   } else {
2881     // Make an unused local variable to avoid warning from gcc compiler.
2882     bool dummy = os::write(defaultStream::output_fd(), s, len);
2883   }
2884 }
2885 
2886 } // Extern C
2887 
2888 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2889 
2890 // In most of the JVM thread support functions we need to access the
2891 // thread through a ThreadsListHandle to prevent it from exiting and
2892 // being reclaimed while we try to operate on it. The exceptions to this
2893 // rule are when operating on the current thread, or if the monitor of
2894 // the target java.lang.Thread is locked at the Java level - in both
2895 // cases the target cannot exit.
2896 
2897 static void thread_entry(JavaThread* thread, TRAPS) {
2898   HandleMark hm(THREAD);
2899   Handle obj(THREAD, thread->threadObj());
2900   JavaValue result(T_VOID);
2901   JavaCalls::call_virtual(&result,
2902                           obj,
2903                           vmClasses::Thread_klass(),
2904                           vmSymbols::run_method_name(),
2905                           vmSymbols::void_method_signature(),
2906                           THREAD);
2907 }
2908 
2909 
2910 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2911 #if INCLUDE_CDS
2912   if (CDSConfig::allow_only_single_java_thread()) {
2913     // During java -Xshare:dump, if we allow multiple Java threads to
2914     // execute in parallel, symbols and classes may be loaded in
2915     // random orders which will make the resulting CDS archive
2916     // non-deterministic.
2917     //
2918     // Lucikly, during java -Xshare:dump, it's important to run only
2919     // the code in the main Java thread (which is NOT started here) that
2920     // creates the module graph, etc. It's safe to not start the other
2921     // threads which are launched by class static initializers
2922     // (ReferenceHandler, FinalizerThread and CleanerImpl).
2923     if (log_is_enabled(Info, aot)) {
2924       ResourceMark rm;
2925       oop t = JNIHandles::resolve_non_null(jthread);
2926       log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2927     }
2928     return;
2929   }
2930 #endif
2931   JavaThread *native_thread = nullptr;
2932 
2933   // We cannot hold the Threads_lock when we throw an exception,
2934   // due to rank ordering issues. Example:  we might need to grab the
2935   // Heap_lock while we construct the exception.
2936   bool throw_illegal_thread_state = false;
2937 
2938   // We must release the Threads_lock before we can post a jvmti event
2939   // in Thread::start.
2940   {
2941     ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2942     // Ensure that the C++ Thread and OSThread structures aren't freed before
2943     // we operate.
2944     MutexLocker ml(Threads_lock);
2945 
2946     // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2947     // re-starting an already started thread, so we should usually find
2948     // that the JavaThread is null. However for a JNI attached thread
2949     // there is a small window between the Thread object being created
2950     // (with its JavaThread set) and the update to its threadStatus, so we
2951     // have to check for this
2952     if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2953       throw_illegal_thread_state = true;
2954     } else {
2955       jlong size =
2956              java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2957       // Allocate the C++ Thread structure and create the native thread.  The
2958       // stack size retrieved from java is 64-bit signed, but the constructor takes
2959       // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2960       //  - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2961       //  - Avoid passing negative values which would result in really large stacks.
2962       NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2963       size_t sz = size > 0 ? (size_t) size : 0;
2964       native_thread = new JavaThread(&thread_entry, sz);
2965 
2966       // At this point it may be possible that no osthread was created for the
2967       // JavaThread due to lack of memory. Check for this situation and throw
2968       // an exception if necessary. Eventually we may want to change this so
2969       // that we only grab the lock if the thread was created successfully -
2970       // then we can also do this check and throw the exception in the
2971       // JavaThread constructor.
2972       if (native_thread->osthread() != nullptr) {
2973         // Note: the current thread is not being used within "prepare".
2974         native_thread->prepare(jthread);
2975       }
2976     }
2977   }
2978 
2979   if (throw_illegal_thread_state) {
2980     THROW(vmSymbols::java_lang_IllegalThreadStateException());
2981   }
2982 
2983   assert(native_thread != nullptr, "Starting null thread?");
2984 
2985   if (native_thread->osthread() == nullptr) {
2986     ResourceMark rm(thread);
2987     log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2988                             JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2989     // No one should hold a reference to the 'native_thread'.
2990     native_thread->smr_delete();
2991     if (JvmtiExport::should_post_resource_exhausted()) {
2992       JvmtiExport::post_resource_exhausted(
2993         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2994         os::native_thread_creation_failed_msg());
2995     }
2996     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2997               os::native_thread_creation_failed_msg());
2998   }
2999 
3000   JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3001 
3002   Thread::start(native_thread);
3003 
3004 JVM_END
3005 
3006 
3007 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3008   ThreadsListHandle tlh(thread);
3009   oop java_thread = nullptr;
3010   JavaThread* receiver = nullptr;
3011   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3012   java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3013 
3014   if (is_alive) {
3015     // jthread refers to a live JavaThread.
3016     Thread::set_priority(receiver, (ThreadPriority)prio);
3017   }
3018   // Implied else: If the JavaThread hasn't started yet, then the
3019   // priority set in the java.lang.Thread object above will be pushed
3020   // down when it does start.
3021 JVM_END
3022 
3023 
3024 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3025   HOTSPOT_THREAD_YIELD();
3026   os::naked_yield();
3027 JVM_END
3028 
3029 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3030   if (nanos < 0) {
3031     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3032   }
3033 
3034   if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3035     THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3036   }
3037 
3038   // Save current thread state and restore it at the end of this block.
3039   // And set new thread state to SLEEPING.
3040   JavaThreadSleepState jtss(thread);
3041 
3042   HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3043 
3044   if (nanos == 0) {
3045     os::naked_yield();
3046   } else {
3047     ThreadState old_state = thread->osthread()->get_state();
3048     thread->osthread()->set_state(SLEEPING);
3049     if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3050       // An asynchronous exception could have been thrown on
3051       // us while we were sleeping. We do not overwrite those.
3052       if (!HAS_PENDING_EXCEPTION) {
3053         HOTSPOT_THREAD_SLEEP_END(1);
3054         if (!thread->has_async_exception_condition()) {
3055           // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3056           // to properly restore the thread state.  That's likely wrong.
3057           THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3058         }
3059       }
3060     }
3061     thread->osthread()->set_state(old_state);
3062   }
3063   HOTSPOT_THREAD_SLEEP_END(0);
3064 JVM_END
3065 
3066 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3067   oop jthread = thread->threadObj();
3068   assert(jthread != nullptr, "no current carrier thread!");
3069   return JNIHandles::make_local(THREAD, jthread);
3070 JVM_END
3071 
3072 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3073   oop theThread = thread->vthread();
3074   assert(theThread != (oop)nullptr, "no current thread!");
3075   return JNIHandles::make_local(THREAD, theThread);
3076 JVM_END
3077 
3078 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3079                                      jobject theThread))
3080   oop threadObj = JNIHandles::resolve(theThread);
3081   thread->set_vthread(threadObj);
3082 
3083   // Set _monitor_owner_id of new current Thread
3084   thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3085 
3086   JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3087 JVM_END
3088 
3089 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3090   return ThreadIdentifier::unsafe_offset();
3091 JVM_END
3092 
3093 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3094   ThreadsListHandle tlh(thread);
3095   JavaThread* receiver = nullptr;
3096   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3097   if (is_alive) {
3098     // jthread refers to a live JavaThread.
3099     receiver->interrupt();
3100   }
3101 JVM_END
3102 
3103 // Return true iff the current thread has locked the object passed in
3104 
3105 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3106   if (obj == nullptr) {
3107     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3108   }
3109   Handle h_obj(THREAD, JNIHandles::resolve(obj));
3110   return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3111 JVM_END
3112 
3113 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3114   oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3115   return JNIHandles::make_local(THREAD, trace);
3116 JVM_END
3117 
3118 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3119 #if INCLUDE_JVMTI
3120   oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3121   return JNIHandles::make_local(THREAD, snapshot);
3122 #else
3123   THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
3124 #endif
3125 JVM_END
3126 
3127 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3128   // We don't use a ThreadsListHandle here because the current thread
3129   // must be alive.
3130   oop java_thread = JNIHandles::resolve_non_null(jthread);
3131   JavaThread* thr = java_lang_Thread::thread(java_thread);
3132   if (thread == thr && !thr->has_attached_via_jni()) {
3133     // Thread naming is only supported for the current thread and
3134     // we don't set the name of an attached thread to avoid stepping
3135     // on other programs.
3136     ResourceMark rm(thread);
3137     const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3138     os::set_native_thread_name(thread_name);
3139   }
3140 JVM_END
3141 
3142 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3143   oop theCache = thread->scopedValueCache();
3144   return JNIHandles::make_local(THREAD, theCache);
3145 JVM_END
3146 
3147 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3148                                        jobject theCache))
3149   arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3150   thread->set_scopedValueCache(objs);
3151 JVM_END
3152 
3153 
3154 // java.lang.Package ////////////////////////////////////////////////////////////////
3155 
3156 
3157 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3158   ResourceMark rm(THREAD);
3159   JvmtiVMObjectAllocEventCollector oam;
3160   char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3161   oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3162 return (jstring) JNIHandles::make_local(THREAD, result);
3163 JVM_END
3164 
3165 
3166 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3167   JvmtiVMObjectAllocEventCollector oam;
3168   objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3169   return (jobjectArray) JNIHandles::make_local(THREAD, result);
3170 JVM_END
3171 
3172 
3173 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3174 
3175 
3176 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3177   MonitorLocker ml(Heap_lock);
3178   oop ref = Universe::reference_pending_list();
3179   if (ref != nullptr) {
3180     Universe::clear_reference_pending_list();
3181   }
3182   return JNIHandles::make_local(THREAD, ref);
3183 JVM_END
3184 
3185 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3186   MonitorLocker ml(Heap_lock);
3187   return Universe::has_reference_pending_list();
3188 JVM_END
3189 
3190 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3191   MonitorLocker ml(Heap_lock);
3192   while (!Universe::has_reference_pending_list()) {
3193     ml.wait();
3194   }
3195 JVM_END
3196 
3197 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3198   oop ref_oop = JNIHandles::resolve_non_null(ref);
3199   // PhantomReference has its own implementation of get().
3200   assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3201   oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3202   return JNIHandles::make_local(THREAD, referent);
3203 JVM_END
3204 
3205 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3206   oop ref_oop = JNIHandles::resolve_non_null(ref);
3207   // PhantomReference has its own implementation of refersTo().
3208   // See: JVM_PhantomReferenceRefersTo
3209   assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3210   oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3211   return referent == JNIHandles::resolve(o);
3212 JVM_END
3213 
3214 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3215   oop ref_oop = JNIHandles::resolve_non_null(ref);
3216   // FinalReference has it's own implementation of clear().
3217   assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3218   if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3219     // If the referent has already been cleared then done.
3220     // However, if the referent is dead but has not yet been cleared by
3221     // concurrent reference processing, it should NOT be cleared here.
3222     // Instead, clearing should be left to the GC.  Clearing it here could
3223     // detectably lose an expected notification, which is impossible with
3224     // STW reference processing.  The clearing in enqueue() doesn't have
3225     // this problem, since the enqueue covers the notification, but it's not
3226     // worth the effort to handle that case specially.
3227     return;
3228   }
3229   java_lang_ref_Reference::clear_referent(ref_oop);
3230 JVM_END
3231 
3232 
3233 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3234 
3235 
3236 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3237   oop ref_oop = JNIHandles::resolve_non_null(ref);
3238   oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3239   return referent == JNIHandles::resolve(o);
3240 JVM_END
3241 
3242 
3243 // ObjectInputStream ///////////////////////////////////////////////////////////////
3244 
3245 // Return the first user-defined class loader up the execution stack, or null
3246 // if only code from the bootstrap or platform class loader is on the stack.
3247 
3248 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3249   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3250     InstanceKlass* ik = vfst.method()->method_holder();
3251     oop loader = ik->class_loader();
3252     if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3253       return JNIHandles::make_local(THREAD, loader);
3254     }
3255   }
3256   return nullptr;
3257 JVM_END
3258 
3259 
3260 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3261 
3262 
3263 // resolve array handle and check arguments
3264 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3265   if (arr == nullptr) {
3266     THROW_NULL(vmSymbols::java_lang_NullPointerException());
3267   }
3268   oop a = JNIHandles::resolve_non_null(arr);
3269   if (!a->is_array()) {
3270     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3271   } else if (type_array_only && !a->is_typeArray()) {
3272     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3273   }
3274   return arrayOop(a);
3275 }
3276 
3277 
3278 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3279   arrayOop a = check_array(env, arr, false, CHECK_0);
3280   return a->length();
3281 JVM_END
3282 
3283 
3284 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3285   JvmtiVMObjectAllocEventCollector oam;
3286   arrayOop a = check_array(env, arr, false, CHECK_NULL);
3287   jvalue value;
3288   BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3289   oop box = Reflection::box(&value, type, CHECK_NULL);
3290   return JNIHandles::make_local(THREAD, box);
3291 JVM_END
3292 
3293 
3294 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3295   jvalue value;
3296   value.i = 0; // to initialize value before getting used in CHECK
3297   arrayOop a = check_array(env, arr, true, CHECK_(value));
3298   assert(a->is_typeArray(), "just checking");
3299   BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3300   BasicType wide_type = (BasicType) wCode;
3301   if (type != wide_type) {
3302     Reflection::widen(&value, type, wide_type, CHECK_(value));
3303   }
3304   return value;
3305 JVM_END
3306 
3307 
3308 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3309   arrayOop a = check_array(env, arr, false, CHECK);
3310   oop box = JNIHandles::resolve(val);
3311   jvalue value;
3312   value.i = 0; // to initialize value before getting used in CHECK
3313   BasicType value_type;
3314   if (a->is_objArray()) {
3315     // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3316     value_type = Reflection::unbox_for_regular_object(box, &value);
3317   } else {
3318     value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3319   }
3320   Reflection::array_set(&value, a, index, value_type, CHECK);
3321 JVM_END
3322 
3323 
3324 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3325   arrayOop a = check_array(env, arr, true, CHECK);
3326   assert(a->is_typeArray(), "just checking");
3327   BasicType value_type = (BasicType) vCode;
3328   Reflection::array_set(&v, a, index, value_type, CHECK);
3329 JVM_END
3330 
3331 
3332 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3333   JvmtiVMObjectAllocEventCollector oam;
3334   oop element_mirror = JNIHandles::resolve(eltClass);
3335   oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3336   return JNIHandles::make_local(THREAD, result);
3337 JVM_END
3338 
3339 
3340 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3341   JvmtiVMObjectAllocEventCollector oam;
3342   arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3343   oop element_mirror = JNIHandles::resolve(eltClass);
3344   assert(dim_array->is_typeArray(), "just checking");
3345   oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3346   return JNIHandles::make_local(THREAD, result);
3347 JVM_END
3348 
3349 
3350 // Library support ///////////////////////////////////////////////////////////////////////////
3351 
3352 JVM_LEAF(void*, JVM_LoadZipLibrary())
3353   return ZipLibrary::handle();
3354 JVM_END
3355 
3356 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3357   //%note jvm_ct
3358   char ebuf[1024];
3359   void *load_result;
3360   {
3361     ThreadToNativeFromVM ttnfvm(thread);
3362     load_result = os::dll_load(name, ebuf, sizeof ebuf);
3363   }
3364   if (load_result == nullptr) {
3365     if (throwException) {
3366       char msg[1024];
3367       jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3368       // Since 'ebuf' may contain a string encoded using
3369       // platform encoding scheme, we need to pass
3370       // Exceptions::unsafe_to_utf8 to the new_exception method
3371       // as the last argument. See bug 6367357.
3372       Handle h_exception =
3373         Exceptions::new_exception(thread,
3374                                   vmSymbols::java_lang_UnsatisfiedLinkError(),
3375                                   msg, Exceptions::unsafe_to_utf8);
3376 
3377       THROW_HANDLE_NULL(h_exception);
3378     } else {
3379       log_info(library)("Failed to load library %s", name);
3380       return load_result;
3381     }
3382   }
3383   log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3384   return load_result;
3385 JVM_END
3386 
3387 
3388 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3389   os::dll_unload(handle);
3390   log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3391 JVM_END
3392 
3393 
3394 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3395   void* find_result = os::dll_lookup(handle, name);
3396   log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3397                     find_result != nullptr ? "Found" : "Failed to find",
3398                     name, p2i(handle));
3399   return find_result;
3400 JVM_END
3401 
3402 
3403 // JNI version ///////////////////////////////////////////////////////////////////////////////
3404 
3405 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3406   return Threads::is_supported_jni_version_including_1_1(version);
3407 JVM_END
3408 
3409 
3410 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3411   return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3412 JVM_END
3413 
3414 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3415   return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3416 JVM_END
3417 
3418 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3419   return VMContinuations ? JNI_TRUE : JNI_FALSE;
3420 JVM_END
3421 
3422 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3423   return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3424 JVM_END
3425 
3426 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3427   return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3428 JVM_END
3429 
3430 // String support ///////////////////////////////////////////////////////////////////////////
3431 
3432 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3433   JvmtiVMObjectAllocEventCollector oam;
3434   if (str == nullptr) return nullptr;
3435   oop string = JNIHandles::resolve_non_null(str);
3436   oop result = StringTable::intern(string, CHECK_NULL);
3437   return (jstring) JNIHandles::make_local(THREAD, result);
3438 JVM_END
3439 
3440 
3441 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3442 
3443 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3444 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3445 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3446 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3447 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3448 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3449 
3450 
3451 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3452   VM_Exit::block_if_vm_exited();
3453   return new PlatformMutex();
3454 }
3455 
3456 
3457 JNIEXPORT void JNICALL  JVM_RawMonitorDestroy(void *mon) {
3458   VM_Exit::block_if_vm_exited();
3459   delete ((PlatformMutex*) mon);
3460 }
3461 
3462 
3463 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3464   VM_Exit::block_if_vm_exited();
3465   ((PlatformMutex*) mon)->lock();
3466   return 0;
3467 }
3468 
3469 
3470 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3471   VM_Exit::block_if_vm_exited();
3472   ((PlatformMutex*) mon)->unlock();
3473 }
3474 
3475 
3476 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3477 
3478 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3479                                     Handle loader, jboolean throwError, TRAPS) {
3480   Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3481 
3482   // Check if we should initialize the class
3483   if (init && klass->is_instance_klass()) {
3484     klass->initialize(CHECK_NULL);
3485   }
3486   return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3487 }
3488 
3489 
3490 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3491 
3492 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3493   Handle method_handle;
3494   if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3495     method_handle = Handle(THREAD, JNIHandles::resolve(method));
3496     Handle receiver(THREAD, JNIHandles::resolve(obj));
3497     objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3498     assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3499 
3500     oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3501     jobject res = JNIHandles::make_local(THREAD, result);
3502     if (JvmtiExport::should_post_vm_object_alloc()) {
3503       oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3504       assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3505       if (java_lang_Class::is_primitive(ret_type)) {
3506         // Only for primitive type vm allocates memory for java object.
3507         // See box() method.
3508         JvmtiExport::post_vm_object_alloc(thread, result);
3509       }
3510     }
3511     return res;
3512   } else {
3513     THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3514   }
3515 JVM_END
3516 
3517 
3518 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3519   objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3520   assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3521   oop constructor_mirror = JNIHandles::resolve(c);
3522   oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3523   jobject res = JNIHandles::make_local(THREAD, result);
3524   if (JvmtiExport::should_post_vm_object_alloc()) {
3525     JvmtiExport::post_vm_object_alloc(thread, result);
3526   }
3527   return res;
3528 JVM_END
3529 
3530 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3531   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3532   HeapShared::initialize_from_archived_subgraph(THREAD, k);
3533 JVM_END
3534 
3535 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3536                                               jclass caller,
3537                                               jstring interfaceMethodName,
3538                                               jobject factoryType,
3539                                               jobject interfaceMethodType,
3540                                               jobject implementationMember,
3541                                               jobject dynamicMethodType,
3542                                               jclass lambdaProxyClass))
3543 #if INCLUDE_CDS
3544   if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3545     return;
3546   }
3547 
3548   InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3549   if (caller_ik->is_hidden()) {
3550     // Hidden classes not of type lambda proxy classes are currently not being archived.
3551     // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3552     // registered for archiving.
3553     return;
3554   }
3555   InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3556   assert(lambda_ik->is_hidden(), "must be a hidden class");
3557   assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3558 
3559   Symbol* interface_method_name = nullptr;
3560   if (interfaceMethodName != nullptr) {
3561     interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3562   }
3563   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3564   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3565 
3566   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3567   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3568 
3569   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3570   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3571   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3572 
3573   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3574   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3575 
3576   LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3577                                                      interface_method_type, m, dynamic_method_type, THREAD);
3578 #endif // INCLUDE_CDS
3579 JVM_END
3580 
3581 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3582                                                         jclass caller,
3583                                                         jstring interfaceMethodName,
3584                                                         jobject factoryType,
3585                                                         jobject interfaceMethodType,
3586                                                         jobject implementationMember,
3587                                                         jobject dynamicMethodType))
3588 #if INCLUDE_CDS
3589 
3590   if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3591       implementationMember == nullptr || dynamicMethodType == nullptr) {
3592     THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3593   }
3594 
3595   InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3596   if (!caller_ik->in_aot_cache()) {
3597     // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3598     return nullptr;
3599   }
3600 
3601   Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3602   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3603   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3604 
3605   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3606   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3607 
3608   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3609   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3610   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3611 
3612   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3613   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3614 
3615   InstanceKlass* loaded_lambda =
3616     LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3617                                                                interface_method_type, m, dynamic_method_type,
3618                                                                CHECK_(nullptr));
3619   return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3620 #else
3621   return nullptr;
3622 #endif // INCLUDE_CDS
3623 JVM_END
3624 
3625 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3626   if (CDSConfig::is_dumping_static_archive()) {
3627     // We do this so that the default CDS archive can be deterministic.
3628     const char* release = VM_Version::vm_release();
3629     const char* dbg_level = VM_Version::jdk_debug_level();
3630     const char* version = VM_Version::internal_vm_info_string();
3631     jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3632                          java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3633                          java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3634     seed += (jlong)VM_Version::vm_major_version();
3635     seed += (jlong)VM_Version::vm_minor_version();
3636     seed += (jlong)VM_Version::vm_security_version();
3637     seed += (jlong)VM_Version::vm_patch_version();
3638     if (seed == 0) { // don't let this ever be zero.
3639       seed = 0x87654321;
3640     }
3641     log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3642     return seed;
3643   } else {
3644     return 0;
3645   }
3646 JVM_END
3647 
3648 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3649   return CDSConfig::get_status();
3650 JVM_END
3651 
3652 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3653 #if INCLUDE_CDS
3654   assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3655   if (line != nullptr) {
3656     ResourceMark rm(THREAD);
3657     Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3658     char* c_line = java_lang_String::as_utf8_string(h_line());
3659     if (CDSConfig::is_dumping_dynamic_archive()) {
3660       // Note: LambdaFormInvokers::append take same format which is not
3661       // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3662       LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3663     }
3664     if (ClassListWriter::is_enabled()) {
3665       ClassListWriter w;
3666       w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3667     }
3668   }
3669 #endif // INCLUDE_CDS
3670 JVM_END
3671 
3672 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3673 #if INCLUDE_CDS
3674   ResourceMark rm(THREAD);
3675   Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3676   char* file_name  = java_lang_String::as_utf8_string(file_handle());
3677   AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3678 #endif // INCLUDE_CDS
3679 JVM_END
3680 
3681 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3682 #if INCLUDE_CDS
3683   ResourceMark rm(THREAD);
3684   Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3685   char* archive_name  = java_lang_String::as_utf8_string(file_handle());
3686   DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3687 #endif // INCLUDE_CDS
3688 JVM_END
3689 
3690 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3691 #if INCLUDE_CDS
3692   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3693   if (!k->is_instance_klass()) {
3694     return false;
3695   } else {
3696     if (InstanceKlass::cast(k)->is_enum_subclass() ||
3697         AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3698       // This class will be cached in AOT-initialized state. No need for init barriers.
3699       return false;
3700     } else {
3701       // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3702       // must emit barriers to ensure class initialization during production run.
3703       ResourceMark rm(THREAD);
3704       log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3705       return true;
3706     }
3707   }
3708 #else
3709   return false;
3710 #endif // INCLUDE_CDS
3711 JVM_END
3712 
3713 // Returns an array of all live Thread objects (VM internal JavaThreads,
3714 // jvmti agent threads, and JNI attaching threads  are skipped)
3715 // See CR 6404306 regarding JNI attaching threads
3716 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3717   ResourceMark rm(THREAD);
3718   ThreadsListEnumerator tle(THREAD, false, false);
3719   JvmtiVMObjectAllocEventCollector oam;
3720 
3721   int num_threads = tle.num_threads();
3722   objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3723   objArrayHandle threads_ah(THREAD, r);
3724 
3725   for (int i = 0; i < num_threads; i++) {
3726     Handle h = tle.get_threadObj(i);
3727     threads_ah->obj_at_put(i, h());
3728   }
3729 
3730   return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3731 JVM_END
3732 
3733 
3734 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3735 // Return StackTraceElement[][], each element is the stack trace of a thread in
3736 // the corresponding entry in the given threads array
3737 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3738   JvmtiVMObjectAllocEventCollector oam;
3739 
3740   // Check if threads is null
3741   if (threads == nullptr) {
3742     THROW_NULL(vmSymbols::java_lang_NullPointerException());
3743   }
3744 
3745   objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3746   objArrayHandle ah(THREAD, a);
3747   int num_threads = ah->length();
3748   // check if threads is non-empty array
3749   if (num_threads == 0) {
3750     THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3751   }
3752 
3753   // check if threads is not an array of objects of Thread class
3754   Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3755   if (k != vmClasses::Thread_klass()) {
3756     THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3757   }
3758   refArrayHandle rah(THREAD, (refArrayOop)ah()); // j.l.Thread is an identity class, arrays are always reference arrays
3759 
3760   ResourceMark rm(THREAD);
3761 
3762   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3763   for (int i = 0; i < num_threads; i++) {
3764     oop thread_obj = rah->obj_at(i);
3765     instanceHandle h(THREAD, (instanceOop) thread_obj);
3766     thread_handle_array->append(h);
3767   }
3768 
3769   // The JavaThread references in thread_handle_array are validated
3770   // in VM_ThreadDump::doit().
3771   Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3772   return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3773 
3774 JVM_END
3775 
3776 // JVM monitoring and management support
3777 JVM_LEAF(void*, JVM_GetManagement(jint version))
3778   return Management::get_jmm_interface(version);
3779 JVM_END
3780 
3781 // com.sun.tools.attach.VirtualMachine agent properties support
3782 //
3783 // Initialize the agent properties with the properties maintained in the VM
3784 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3785   ResourceMark rm;
3786 
3787   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3788 
3789   PUTPROP(props, "sun.java.command", Arguments::java_command());
3790   PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3791   PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3792   return properties;
3793 JVM_END
3794 
3795 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3796 {
3797   JvmtiVMObjectAllocEventCollector oam;
3798 
3799   if (ofClass == nullptr) {
3800     return nullptr;
3801   }
3802   Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3803   // Special handling for primitive objects
3804   if (java_lang_Class::is_primitive(mirror())) {
3805     return nullptr;
3806   }
3807   Klass* k = java_lang_Class::as_Klass(mirror());
3808   if (!k->is_instance_klass()) {
3809     return nullptr;
3810   }
3811   InstanceKlass* ik = InstanceKlass::cast(k);
3812   int encl_method_class_idx = ik->enclosing_method_class_index();
3813   if (encl_method_class_idx == 0) {
3814     return nullptr;
3815   }
3816   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3817   objArrayHandle dest(THREAD, dest_o);
3818   Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3819   dest->obj_at_put(0, enc_k->java_mirror());
3820   int encl_method_method_idx = ik->enclosing_method_method_index();
3821   if (encl_method_method_idx != 0) {
3822     Symbol* sym = ik->constants()->symbol_at(
3823                         extract_low_short_from_int(
3824                           ik->constants()->name_and_type_at(encl_method_method_idx)));
3825     Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3826     dest->obj_at_put(1, str());
3827     sym = ik->constants()->symbol_at(
3828               extract_high_short_from_int(
3829                 ik->constants()->name_and_type_at(encl_method_method_idx)));
3830     str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3831     dest->obj_at_put(2, str());
3832   }
3833   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3834 }
3835 JVM_END
3836 
3837 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3838 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3839   ResourceMark rm(THREAD);
3840 
3841   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3842     return nullptr;
3843   }
3844 
3845   char** vm_flags = Arguments::jvm_flags_array();
3846   char** vm_args = Arguments::jvm_args_array();
3847   int num_flags = Arguments::num_jvm_flags();
3848   int num_args = Arguments::num_jvm_args();
3849 
3850   InstanceKlass* ik = vmClasses::String_klass();
3851   objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3852   objArrayHandle result_h(THREAD, r);
3853 
3854   int index = 0;
3855   for (int j = 0; j < num_flags; j++, index++) {
3856     Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3857     result_h->obj_at_put(index, h());
3858   }
3859   for (int i = 0; i < num_args; i++, index++) {
3860     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3861     result_h->obj_at_put(index, h());
3862   }
3863   return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3864 JVM_END
3865 
3866 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3867   return os::get_signal_number(name);
3868 JVM_END
3869 
3870 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3871 #if INCLUDE_JVMTI
3872   if (!DoJVMTIVirtualThreadTransitions) {
3873     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3874     return;
3875   }
3876   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3877     JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3878   } else {
3879     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3880     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3881   }
3882 #endif
3883 JVM_END
3884 
3885 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3886 #if INCLUDE_JVMTI
3887   if (!DoJVMTIVirtualThreadTransitions) {
3888     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3889     return;
3890   }
3891   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3892     JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3893   } else {
3894     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3895     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3896   }
3897 #endif
3898 JVM_END
3899 
3900 // If notifications are disabled then just update the VTMS transition bit and return.
3901 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3902 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3903 #if INCLUDE_JVMTI
3904   if (!DoJVMTIVirtualThreadTransitions) {
3905     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3906     return;
3907   }
3908   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3909     JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3910   } else {
3911     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3912     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3913   }
3914 #endif
3915 JVM_END
3916 
3917 // If notifications are disabled then just update the VTMS transition bit and return.
3918 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3919 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3920 #if INCLUDE_JVMTI
3921   if (!DoJVMTIVirtualThreadTransitions) {
3922     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3923     return;
3924   }
3925   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3926     JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3927   } else {
3928     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3929     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3930   }
3931 #endif
3932 JVM_END
3933 
3934 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3935 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3936 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3937 #if INCLUDE_JVMTI
3938   if (!DoJVMTIVirtualThreadTransitions) {
3939     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3940     return;
3941   }
3942   assert(thread->is_disable_suspend() != (bool)enter,
3943          "nested or unbalanced monitor enter/exit is not allowed");
3944   thread->toggle_is_disable_suspend();
3945 #endif
3946 JVM_END
3947 
3948 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3949 #if INCLUDE_JFR
3950   freeze_result result = THREAD->last_freeze_fail_result();
3951   assert(result != freeze_ok, "sanity check");
3952   EventVirtualThreadPinned event(UNTIMED);
3953   event.set_starttime(THREAD->last_freeze_fail_time());
3954   if (event.should_commit()) {
3955     ResourceMark rm(THREAD);
3956     const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3957     THREAD->post_vthread_pinned_event(&event, str, result);
3958   }
3959 #endif
3960 JVM_END
3961 
3962 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3963   ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3964   assert(parkEvent != nullptr, "not initialized");
3965 
3966   OopHandle& list_head = ObjectMonitor::vthread_list_head();
3967   oop vthread_head = nullptr;
3968   while (true) {
3969     if (list_head.peek() != nullptr) {
3970       for (;;) {
3971         oop head = list_head.resolve();
3972         if (list_head.cmpxchg(head, nullptr) == head) {
3973           return JNIHandles::make_local(THREAD, head);
3974         }
3975       }
3976     }
3977     ThreadBlockInVM tbivm(THREAD);
3978     parkEvent->park();
3979   }
3980 JVM_END
3981 /*
3982  * Return the current class's class file version.  The low order 16 bits of the
3983  * returned jint contain the class's major version.  The high order 16 bits
3984  * contain the class's minor version.
3985  */
3986 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3987   oop mirror = JNIHandles::resolve_non_null(current);
3988   if (java_lang_Class::is_primitive(mirror)) {
3989     // return latest major version and minor version of 0.
3990     return JVM_CLASSFILE_MAJOR_VERSION;
3991   }
3992   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3993   return (ik->minor_version() << 16) | ik->major_version();
3994 JVM_END
3995 
3996 /*
3997  * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3998  * get the value will see a materialized value and not a scalar-replaced
3999  * null value.
4000  */
4001 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4002   JVM_EnsureMaterializedForStackWalk(env, value);
4003 JVM_END
4004 
4005 /*
4006  * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4007  */
4008 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4009   return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4010 JVM_END