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.
 979 JVM_ENTRY(jclass, JVM_FindClassFromLoader(JNIEnv* env, const char* name,
 980                                           jboolean init, jobject loader))
 981   TempNewSymbol h_name =
 982        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
 983                                            CHECK_NULL);
 984 
 985   oop loader_oop = JNIHandles::resolve(loader);
 986   Handle h_loader(THREAD, loader_oop);
 987 
 988   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 989                                                false, THREAD);
 990 
 991   if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
 992     trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
 993   }
 994   return result;
 995 JVM_END
 996 
 997 // Currently only called from the old verifier.
 998 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
 999                                          jboolean init, jclass from))
1000   TempNewSymbol h_name =
1001        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
1002                                            CHECK_NULL);
1003   oop from_class_oop = JNIHandles::resolve(from);
1004   assert(from_class_oop != nullptr, "must be");
1005   Klass* from_class = java_lang_Class::as_Klass(from_class_oop);
1006   assert(from_class != nullptr, "must be");
1007   oop class_loader = from_class->class_loader();
1008 
1009   Handle h_loader(THREAD, class_loader);
1010   jclass result = find_class_from_class_loader(env, h_name, init, h_loader, true, thread);
1011 
1012   if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
1013     // this function is generally only used for class loading during verification.
1014     ResourceMark rm;
1015     const char* from_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(from))->external_name();
1016     const char* to_name = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result))->external_name();
1017     log_debug(class, resolve)("%s %s (verification)", from_name, to_name);
1018   }
1019 
1020 #if INCLUDE_CDS
1021   if (CDSConfig::is_preserving_verification_constraints() && from_class->is_instance_klass()) {
1022     InstanceKlass* ik = InstanceKlass::cast(from_class);
1023     SystemDictionaryShared::add_old_verification_constraint(THREAD, ik, h_name);
1024   }
1025 #endif
1026 
1027   return result;
1028 JVM_END
1029 
1030 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
1031 static jclass jvm_define_class_common(const char *name,
1032                                       jobject loader, const jbyte *buf,
1033                                       jsize len, jobject pd, const char *source,
1034                                       TRAPS) {
1035   if (source == nullptr)  source = "__JVM_DefineClass__";
1036 
1037   JavaThread* jt = THREAD;
1038 
1039   PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
1040                              ClassLoader::perf_define_appclass_selftime(),
1041                              ClassLoader::perf_define_appclasses(),
1042                              jt->get_thread_stat()->perf_recursion_counts_addr(),
1043                              jt->get_thread_stat()->perf_timers_addr(),
1044                              PerfClassTraceTime::DEFINE_CLASS);
1045 
1046   if (UsePerfData) {
1047     ClassLoader::perf_app_classfile_bytes_read()->inc(len);
1048   }
1049 
1050   // Class resolution will get the class name from the .class stream if the name is null.
1051   TempNewSymbol class_name = name == nullptr ? nullptr :
1052        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1053                                            CHECK_NULL);
1054 
1055   ResourceMark rm(THREAD);
1056   ClassFileStream st((u1*)buf, len, source);
1057   Handle class_loader (THREAD, JNIHandles::resolve(loader));
1058   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1059   ClassLoadInfo cl_info(protection_domain);
1060   Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
1061                                                    class_loader,
1062                                                    cl_info,
1063                                                    CHECK_NULL);
1064 
1065   if (log_is_enabled(Debug, class, resolve)) {
1066     trace_class_resolution(k);
1067   }
1068 
1069   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1070 }
1071 
1072 enum {
1073   NESTMATE              = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
1074   HIDDEN_CLASS          = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
1075   STRONG_LOADER_LINK    = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
1076   ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
1077 };
1078 
1079 /*
1080  * Define a class with the specified flags that indicates if it's a nestmate,
1081  * hidden, or strongly referenced from class loader.
1082  */
1083 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
1084                                       const jbyte *buf, jsize len, jobject pd,
1085                                       jboolean init, int flags, jobject classData, TRAPS) {
1086   ResourceMark rm(THREAD);
1087 
1088   InstanceKlass* lookup_k = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(lookup));
1089   // Lookup class must not be a primitive class (whose mirror has a null Klass*)
1090   if (lookup_k == nullptr) {
1091     // The error message is wrong. We come here only if lookup is a primitive class
1092     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1093   }
1094 
1095   Handle class_loader (THREAD, lookup_k->class_loader());
1096 
1097   bool is_nestmate = (flags & NESTMATE) == NESTMATE;
1098   bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
1099   bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
1100   bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
1101 
1102   InstanceKlass* host_class = nullptr;
1103   if (is_nestmate) {
1104     host_class = lookup_k->nest_host(CHECK_NULL);
1105   }
1106 
1107   log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
1108                              name,
1109                              is_nestmate ? "with dynamic nest-host " : "non-nestmate",
1110                              is_nestmate ? host_class->external_name() : "",
1111                              is_hidden ? "hidden" : "not hidden",
1112                              is_strong ? "strong" : "weak",
1113                              vm_annotations ? "with vm annotations" : "without vm annotation");
1114 
1115   if (!is_hidden) {
1116     // classData is only applicable for hidden classes
1117     if (classData != nullptr) {
1118       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
1119     }
1120     if (is_nestmate) {
1121       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
1122     }
1123     if (!is_strong) {
1124       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
1125     }
1126     if (vm_annotations) {
1127       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
1128     }
1129     if (flags != STRONG_LOADER_LINK) {
1130       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1131                      err_msg("invalid flag 0x%x", flags));
1132     }
1133   }
1134 
1135   // Class resolution will get the class name from the .class stream if the name is null.
1136   TempNewSymbol class_name = name == nullptr ? nullptr :
1137        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1138                                            CHECK_NULL);
1139 
1140   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1141   const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1142   ClassFileStream st((u1*)buf, len, source);
1143 
1144   InstanceKlass* ik = nullptr;
1145   if (!is_hidden) {
1146     ClassLoadInfo cl_info(protection_domain);
1147     ik = SystemDictionary::resolve_from_stream(&st, class_name,
1148                                                class_loader,
1149                                                cl_info,
1150                                                CHECK_NULL);
1151 
1152     if (log_is_enabled(Debug, class, resolve)) {
1153       trace_class_resolution(ik);
1154     }
1155   } else { // hidden
1156     Handle classData_h(THREAD, JNIHandles::resolve(classData));
1157     ClassLoadInfo cl_info(protection_domain,
1158                           host_class,
1159                           classData_h,
1160                           is_hidden,
1161                           is_strong,
1162                           vm_annotations);
1163     ik = SystemDictionary::resolve_from_stream(&st, class_name,
1164                                                class_loader,
1165                                                cl_info,
1166                                                CHECK_NULL);
1167 
1168     // The hidden class loader data has been artificially been kept alive to
1169     // this point. The mirror and any instances of this class have to keep
1170     // it alive afterwards.
1171     ik->class_loader_data()->dec_keep_alive_ref_count();
1172 
1173     if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1174       ModuleEntry* module = ik->module();
1175       const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1176       log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1177                                   module_name,
1178                                   ik->external_name(),
1179                                   host_class->external_name(),
1180                                   ik->is_hidden() ? "is hidden" : "is not hidden");
1181     }
1182   }
1183 
1184   if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1185     // non-hidden class or nestmate class must be in the same package as the Lookup class
1186     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1187   }
1188 
1189   if (init) {
1190     ik->initialize(CHECK_NULL);
1191   } else {
1192     ik->link_class(CHECK_NULL);
1193   }
1194 
1195   return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1196 }
1197 
1198 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1199   return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1200 JVM_END
1201 
1202 /*
1203  * Define a class with the specified lookup class.
1204  *  lookup:  Lookup class
1205  *  name:    the name of the class
1206  *  buf:     class bytes
1207  *  len:     length of class bytes
1208  *  pd:      protection domain
1209  *  init:    initialize the class
1210  *  flags:   properties of the class
1211  *  classData: private static pre-initialized field
1212  */
1213 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1214           jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1215 
1216   if (lookup == nullptr) {
1217     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1218   }
1219 
1220   assert(buf != nullptr, "buf must not be null");
1221 
1222   return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1223 JVM_END
1224 
1225 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1226 
1227   return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1228 JVM_END
1229 
1230 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1231   ResourceMark rm(THREAD);
1232 
1233   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1234   char* str = java_lang_String::as_utf8_string(h_name());
1235 
1236   // Sanity check, don't expect null
1237   if (str == nullptr) return nullptr;
1238 
1239   // Internalize the string, converting '.' to '/' in string.
1240   char* p = (char*)str;
1241   while (*p != '\0') {
1242     if (*p == '.') {
1243       *p = '/';
1244     }
1245     p++;
1246   }
1247 
1248   const int str_len = (int)(p - str);
1249   if (str_len > Symbol::max_length()) {
1250     // It's impossible to create this class;  the name cannot fit
1251     // into the constant pool.
1252     return nullptr;
1253   }
1254   TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1255 
1256   // Security Note:
1257   //   The Java level wrapper will perform the necessary security check allowing
1258   //   us to pass the null as the initiating class loader.
1259   Handle h_loader(THREAD, JNIHandles::resolve(loader));
1260   Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name, h_loader);
1261 #if INCLUDE_CDS
1262   if (k == nullptr) {
1263     // If the class is not already loaded, try to see if it's in the shared
1264     // archive for the current classloader (h_loader).
1265     k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1266   }
1267 #endif
1268   return (k == nullptr) ? nullptr :
1269             (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1270 JVM_END
1271 
1272 // Module support //////////////////////////////////////////////////////////////////////////////
1273 
1274 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1275                                  jstring location, jobjectArray packages))
1276   Handle h_module (THREAD, JNIHandles::resolve(module));
1277   Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1278 JVM_END
1279 
1280 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1281   Handle h_module (THREAD, JNIHandles::resolve(module));
1282   Modules::set_bootloader_unnamed_module(h_module, CHECK);
1283 JVM_END
1284 
1285 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1286   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1287   Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1288   Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1289 JVM_END
1290 
1291 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1292   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1293   Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1294 JVM_END
1295 
1296 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1297   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1298   Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1299 JVM_END
1300 
1301 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1302   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1303   Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1304   Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1305 JVM_END
1306 
1307 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1308   Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1309   Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1310   Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1311 JVM_END
1312 
1313 // Reflection support //////////////////////////////////////////////////////////////////////////////
1314 
1315 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1316   assert (cls != nullptr, "illegal class");
1317   JvmtiVMObjectAllocEventCollector oam;
1318   ResourceMark rm(THREAD);
1319   HandleMark hm(THREAD);
1320   Handle java_class(THREAD, JNIHandles::resolve(cls));
1321   oop result = java_lang_Class::name(java_class, CHECK_NULL);
1322   return (jstring) JNIHandles::make_local(THREAD, result);
1323 JVM_END
1324 
1325 
1326 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1327   JvmtiVMObjectAllocEventCollector oam;
1328   oop mirror = JNIHandles::resolve_non_null(cls);
1329 
1330   // Special handling for primitive objects
1331   if (java_lang_Class::is_primitive(mirror)) {
1332     // Primitive objects does not have any interfaces
1333     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1334     return (jobjectArray) JNIHandles::make_local(THREAD, r);
1335   }
1336 
1337   Klass* klass = java_lang_Class::as_Klass(mirror);
1338   // Figure size of result array
1339   int size;
1340   if (klass->is_instance_klass()) {
1341     InstanceKlass* ik = InstanceKlass::cast(klass);
1342     size = ik->local_interfaces()->length();
1343   } else {
1344     assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1345     size = 2;
1346   }
1347 
1348   // Allocate result array
1349   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1350   objArrayHandle result (THREAD, r);
1351   // Fill in result
1352   if (klass->is_instance_klass()) {
1353     // Regular instance klass, fill in all local interfaces
1354     for (int index = 0; index < size; index++) {
1355       InstanceKlass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1356       result->obj_at_put(index, k->java_mirror());
1357     }
1358   } else {
1359     // All arrays implement java.lang.Cloneable and java.io.Serializable
1360     result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1361     result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1362   }
1363   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1364 JVM_END
1365 
1366 
1367 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1368   oop mirror = JNIHandles::resolve_non_null(cls);
1369   if (java_lang_Class::is_primitive(mirror)) {
1370     return JNI_FALSE;
1371   }
1372   Klass* k = java_lang_Class::as_Klass(mirror);
1373   return k->is_hidden();
1374 JVM_END
1375 

1376 class ScopedValueBindingsResolver {
1377 public:
1378   InstanceKlass* Carrier_klass;
1379   ScopedValueBindingsResolver(JavaThread* THREAD) {
1380     Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1381     Carrier_klass = InstanceKlass::cast(k);
1382   }
1383 };
1384 
1385 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1386   ResourceMark rm(THREAD);
1387   GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1388   JvmtiVMObjectAllocEventCollector oam;
1389 
1390   static ScopedValueBindingsResolver resolver(THREAD);
1391 
1392   // Iterate through Java frames
1393   vframeStream vfst(thread);
1394   for(; !vfst.at_end(); vfst.next()) {
1395     int loc = -1;
1396     // get method of frame
1397     Method* method = vfst.method();
1398 
1399     Symbol *name = method->name();
1400 
1401     InstanceKlass* holder = method->method_holder();
1402     if (name == vmSymbols::runWith_method_name()) {
1403       if (holder == vmClasses::Thread_klass()
1404           || holder == resolver.Carrier_klass) {
1405         loc = 1;
1406       }
1407     }
1408 
1409     if (loc != -1) {
1410       javaVFrame *frame = vfst.asJavaVFrame();
1411       StackValueCollection* locals = frame->locals();
1412       StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1413       Handle result = head_sv->get_obj();
1414       assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1415       if (result() != nullptr) {
1416         return JNIHandles::make_local(THREAD, result());
1417       }
1418     }
1419   }
1420 
1421   return nullptr;
1422 JVM_END
1423 
1424 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1425   JvmtiVMObjectAllocEventCollector oam;
1426   // ofClass is a reference to a java_lang_Class object. The mirror object
1427   // of an InstanceKlass
1428   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1429   if (java_lang_Class::is_primitive(ofMirror) ||
1430       ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1431     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1432     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1433   }
1434 
1435   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1436   InnerClassesIterator iter(k);
1437 
1438   if (iter.length() == 0) {
1439     // Neither an inner nor outer class
1440     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1441     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1442   }
1443 
1444   // find inner class info
1445   constantPoolHandle cp(thread, k->constants());
1446   int length = iter.length();
1447 
1448   // Allocate temp. result array
1449   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1450   objArrayHandle result (THREAD, r);
1451   int members = 0;
1452 
1453   for (; !iter.done(); iter.next()) {
1454     int ioff = iter.inner_class_info_index();
1455     int ooff = iter.outer_class_info_index();
1456 
1457     if (ioff != 0 && ooff != 0) {
1458       // Check to see if the name matches the class we're looking for
1459       // before attempting to find the class.
1460       if (cp->klass_name_at_matches(k, ooff)) {
1461         Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1462         if (outer_klass == k) {
1463            Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1464            InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1465 
1466            // Throws an exception if outer klass has not declared k as
1467            // an inner klass
1468            Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1469 
1470            result->obj_at_put(members, inner_klass->java_mirror());
1471            members++;
1472         }
1473       }
1474     }
1475   }
1476 
1477   if (members != length) {
1478     // Return array of right length
1479     objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1480     for(int i = 0; i < members; i++) {
1481       res->obj_at_put(i, result->obj_at(i));
1482     }
1483     return (jobjectArray)JNIHandles::make_local(THREAD, res);
1484   }
1485 
1486   return (jobjectArray)JNIHandles::make_local(THREAD, result());
1487 JVM_END
1488 
1489 
1490 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1491 {
1492   // ofClass is a reference to a java_lang_Class object.
1493   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1494   if (java_lang_Class::is_primitive(ofMirror)) {
1495     return nullptr;
1496   }
1497   Klass* klass = java_lang_Class::as_Klass(ofMirror);
1498   if (!klass->is_instance_klass()) {
1499     return nullptr;
1500   }
1501 
1502   bool inner_is_member = false;
1503   Klass* outer_klass
1504     = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1505   if (outer_klass == nullptr)  return nullptr;  // already a top-level class
1506   if (!inner_is_member)  return nullptr;     // a hidden class (inside a method)
1507   return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1508 }
1509 JVM_END
1510 
1511 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1512 {
1513   oop mirror = JNIHandles::resolve_non_null(cls);
1514   if (java_lang_Class::is_primitive(mirror)) {
1515     return nullptr;
1516   }
1517   Klass* klass = java_lang_Class::as_Klass(mirror);
1518   if (!klass->is_instance_klass()) {
1519     return nullptr;
1520   }
1521   InstanceKlass* k = InstanceKlass::cast(klass);
1522   int ooff = 0, noff = 0;
1523   if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1524     if (noff != 0) {
1525       constantPoolHandle i_cp(thread, k->constants());
1526       Symbol* name = i_cp->symbol_at(noff);
1527       Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1528       return (jstring) JNIHandles::make_local(THREAD, str());
1529     }
1530   }
1531   return nullptr;
1532 }
1533 JVM_END
1534 
1535 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1536   assert (cls != nullptr, "illegal class");
1537   JvmtiVMObjectAllocEventCollector oam;
1538   ResourceMark rm(THREAD);
1539   oop mirror = JNIHandles::resolve_non_null(cls);
1540   // Return null for arrays and primitives
1541   if (!java_lang_Class::is_primitive(mirror)) {
1542     Klass* k = java_lang_Class::as_Klass(mirror);
1543     if (k->is_instance_klass()) {
1544       Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1545       if (sym == nullptr) return nullptr;
1546       Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1547       return (jstring) JNIHandles::make_local(THREAD, str());
1548     }
1549   }
1550   return nullptr;
1551 JVM_END
1552 
1553 
1554 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1555   assert (cls != nullptr, "illegal class");
1556   oop mirror = JNIHandles::resolve_non_null(cls);
1557   // Return null for arrays and primitives
1558   if (!java_lang_Class::is_primitive(mirror)) {
1559     Klass* k = java_lang_Class::as_Klass(mirror);
1560     if (k->is_instance_klass()) {
1561       typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1562       return (jbyteArray) JNIHandles::make_local(THREAD, a);
1563     }
1564   }
1565   return nullptr;
1566 JVM_END
1567 
1568 
1569 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1570   // some of this code was adapted from from jni_FromReflectedField
1571 
1572   oop reflected = JNIHandles::resolve_non_null(field);
1573   oop mirror    = java_lang_reflect_Field::clazz(reflected);
1574   int slot      = java_lang_reflect_Field::slot(reflected);
1575   int modifiers = java_lang_reflect_Field::modifiers(reflected);
1576 
1577   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1578   int offset = ik->field_offset(slot);
1579 
1580   if (modifiers & JVM_ACC_STATIC) {
1581     // for static fields we only look in the current class
1582     if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1583       assert(false, "cannot find static field");
1584       return false;
1585     }
1586   } else {
1587     // for instance fields we start with the current class and work
1588     // our way up through the superclass chain
1589     if (!ik->find_field_from_offset(offset, false, &fd)) {
1590       assert(false, "cannot find instance field");
1591       return false;
1592     }
1593   }
1594   return true;
1595 }
1596 
1597 static Method* jvm_get_method_common(jobject method) {
1598   // some of this code was adapted from from jni_FromReflectedMethod
1599 
1600   oop reflected = JNIHandles::resolve_non_null(method);
1601   oop mirror    = nullptr;
1602   int slot      = 0;
1603 
1604   if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1605     mirror = java_lang_reflect_Constructor::clazz(reflected);
1606     slot   = java_lang_reflect_Constructor::slot(reflected);
1607   } else {
1608     assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1609            "wrong type");
1610     mirror = java_lang_reflect_Method::clazz(reflected);
1611     slot   = java_lang_reflect_Method::slot(reflected);
1612   }
1613   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
1614 
1615   Method* m = ik->method_with_idnum(slot);
1616   assert(m != nullptr, "cannot find method");
1617   return m;  // caller has to deal with null in product mode
1618 }
1619 
1620 /* Type use annotations support (JDK 1.8) */
1621 
1622 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1623   assert (cls != nullptr, "illegal class");
1624   ResourceMark rm(THREAD);
1625   // Return null for arrays and primitives
1626   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1627     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1628     if (k->is_instance_klass()) {
1629       AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1630       if (type_annotations != nullptr) {
1631         typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1632         return (jbyteArray) JNIHandles::make_local(THREAD, a);
1633       }
1634     }
1635   }
1636   return nullptr;
1637 JVM_END
1638 
1639 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1640   assert (method != nullptr, "illegal method");
1641   // method is a handle to a java.lang.reflect.Method object
1642   Method* m = jvm_get_method_common(method);
1643   if (m == nullptr) {
1644     return nullptr;
1645   }
1646 
1647   AnnotationArray* type_annotations = m->type_annotations();
1648   if (type_annotations != nullptr) {
1649     typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1650     return (jbyteArray) JNIHandles::make_local(THREAD, a);
1651   }
1652 
1653   return nullptr;
1654 JVM_END
1655 
1656 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1657   assert (field != nullptr, "illegal field");
1658   fieldDescriptor fd;
1659   bool gotFd = jvm_get_field_common(field, fd);
1660   if (!gotFd) {
1661     return nullptr;
1662   }
1663 
1664   return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1665 JVM_END
1666 
1667 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1668   if (!cp->is_within_bounds(index)) {
1669     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1670   }
1671 }
1672 
1673 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1674 {
1675   // method is a handle to a java.lang.reflect.Method object
1676   Method* method_ptr = jvm_get_method_common(method);
1677   methodHandle mh (THREAD, method_ptr);
1678   Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1679   const int num_params = mh->method_parameters_length();
1680 
1681   if (num_params < 0) {
1682     // A -1 return value from method_parameters_length means there is no
1683     // parameter data.  Return null to indicate this to the reflection
1684     // API.
1685     assert(num_params == -1, "num_params should be -1 if it is less than zero");
1686     return (jobjectArray)nullptr;
1687   } else {
1688     // Otherwise, we return something up to reflection, even if it is
1689     // a zero-length array.  Why?  Because in some cases this can
1690     // trigger a MalformedParametersException.
1691 
1692     // make sure all the symbols are properly formatted
1693     for (int i = 0; i < num_params; i++) {
1694       MethodParametersElement* params = mh->method_parameters_start();
1695       int index = params[i].name_cp_index;
1696       constantPoolHandle cp(THREAD, mh->constants());
1697       bounds_check(cp, index, CHECK_NULL);
1698 
1699       if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1700         THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1701                        "Wrong type at constant pool index");
1702       }
1703 
1704     }
1705 
1706     objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1707     objArrayHandle result (THREAD, result_oop);
1708 
1709     for (int i = 0; i < num_params; i++) {
1710       MethodParametersElement* params = mh->method_parameters_start();
1711       // For a 0 index, give a null symbol
1712       Symbol* sym = 0 != params[i].name_cp_index ?
1713         mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1714       int flags = params[i].flags;
1715       oop param = Reflection::new_parameter(reflected_method, i, sym,
1716                                             flags, CHECK_NULL);
1717       result->obj_at_put(i, param);
1718     }
1719     return (jobjectArray)JNIHandles::make_local(THREAD, result());
1720   }
1721 }
1722 JVM_END
1723 
1724 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1725 
1726 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1727 {
1728   JvmtiVMObjectAllocEventCollector oam;
1729 
1730   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1731   // Exclude primitive types and array types
1732   if (java_lang_Class::is_primitive(ofMirror) ||
1733       java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1734     // Return empty array
1735     oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1736     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1737   }
1738 
1739   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1740   constantPoolHandle cp(THREAD, k->constants());
1741 
1742   // Ensure class is linked
1743   k->link_class(CHECK_NULL);
1744 
1745   // Allocate result
1746   int num_fields;
1747 
1748   if (publicOnly) {
1749     num_fields = 0;
1750     for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1751       if (fs.access_flags().is_public()) ++num_fields;
1752     }
1753   } else {
1754     num_fields = k->java_fields_count();
1755   }
1756 
1757   objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1758   objArrayHandle result (THREAD, r);
1759 
1760   int out_idx = 0;
1761   fieldDescriptor fd;
1762   for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1763     if (!publicOnly || fs.access_flags().is_public()) {
1764       fd.reinitialize(k, fs.to_FieldInfo());
1765       oop field = Reflection::new_field(&fd, CHECK_NULL);
1766       result->obj_at_put(out_idx, field);
1767       ++out_idx;
1768     }
1769   }
1770   assert(out_idx == num_fields, "just checking");
1771   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1772 }
1773 JVM_END
1774 
1775 // A class is a record if and only if it is final and a direct subclass of
1776 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1777 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1778 {
1779   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1780   if (k != nullptr && k->is_instance_klass()) {
1781     InstanceKlass* ik = InstanceKlass::cast(k);
1782     return ik->is_record();
1783   } else {
1784     return false;
1785   }
1786 }
1787 JVM_END
1788 
1789 // Returns an array containing the components of the Record attribute,
1790 // or null if the attribute is not present.
1791 //
1792 // Note that this function returns the components of the Record attribute
1793 // even if the class is not a record.
1794 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1795 {
1796   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(ofClass));
1797 
1798   Array<RecordComponent*>* components = ik->record_components();
1799   if (components != nullptr) {
1800     JvmtiVMObjectAllocEventCollector oam;
1801     constantPoolHandle cp(THREAD, ik->constants());
1802     int length = components->length();
1803     assert(length >= 0, "unexpected record_components length");
1804     objArrayOop record_components =
1805       oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1806     objArrayHandle components_h (THREAD, record_components);
1807 
1808     for (int x = 0; x < length; x++) {
1809       RecordComponent* component = components->at(x);
1810       assert(component != nullptr, "unexpected null record component");
1811       oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1812       components_h->obj_at_put(x, component_oop);
1813     }
1814     return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1815   }
1816 
1817   return nullptr;
1818 }
1819 JVM_END
1820 
1821 static jobjectArray get_class_declared_methods_helper(
1822                                   JNIEnv *env,
1823                                   jclass ofClass, jboolean publicOnly,
1824                                   bool want_constructor,
1825                                   Klass* klass, TRAPS) {
1826 
1827   JvmtiVMObjectAllocEventCollector oam;
1828 
1829   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1830   // Exclude primitive types and array types
1831   if (java_lang_Class::is_primitive(ofMirror)
1832       || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1833     // Return empty array
1834     oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1835     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1836   }
1837 
1838   InstanceKlass* k = java_lang_Class::as_InstanceKlass(ofMirror);
1839 
1840   // Ensure class is linked
1841   k->link_class(CHECK_NULL);
1842 
1843   Array<Method*>* methods = k->methods();
1844   int methods_length = methods->length();
1845 
1846   // Save original method_idnum in case of redefinition, which can change
1847   // the idnum of obsolete methods.  The new method will have the same idnum
1848   // but if we refresh the methods array, the counts will be wrong.
1849   ResourceMark rm(THREAD);
1850   GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1851   int num_methods = 0;
1852 
1853   // Select methods matching the criteria.
1854   for (int i = 0; i < methods_length; i++) {
1855     Method* method = methods->at(i);
1856     if (want_constructor && !method->is_object_constructor()) {
1857       continue;
1858     }
1859     if (!want_constructor &&
1860         (method->is_object_constructor() || method->is_class_initializer() ||
1861          method->is_overpass())) {
1862       continue;
1863     }
1864     if (publicOnly && !method->is_public()) {
1865       continue;
1866     }
1867     idnums->push(method->method_idnum());
1868     ++num_methods;
1869   }
1870 
1871   // Allocate result
1872   objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1873   objArrayHandle result (THREAD, r);
1874 
1875   // Now just put the methods that we selected above, but go by their idnum
1876   // in case of redefinition.  The methods can be redefined at any safepoint,
1877   // so above when allocating the oop array and below when creating reflect
1878   // objects.
1879   for (int i = 0; i < num_methods; i++) {
1880     methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1881     if (method.is_null()) {
1882       // Method may have been deleted and seems this API can handle null
1883       // Otherwise should probably put a method that throws NSME
1884       result->obj_at_put(i, nullptr);
1885     } else {
1886       oop m;
1887       if (want_constructor) {
1888         assert(method->is_object_constructor(), "must be");
1889         m = Reflection::new_constructor(method, CHECK_NULL);
1890       } else {
1891         m = Reflection::new_method(method, false, CHECK_NULL);
1892       }
1893       result->obj_at_put(i, m);
1894     }
1895   }
1896 
1897   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1898 }
1899 
1900 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1901 {
1902   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1903                                            /*want_constructor*/ false,
1904                                            vmClasses::reflect_Method_klass(), THREAD);
1905 }
1906 JVM_END
1907 
1908 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1909 {
1910   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1911                                            /*want_constructor*/ true,
1912                                            vmClasses::reflect_Constructor_klass(), THREAD);
1913 }
1914 JVM_END
1915 
1916 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1917 {
1918   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1919   InstanceKlass* m = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(member));
1920   return c->has_nestmate_access_to(m, THREAD);
1921 }
1922 JVM_END
1923 
1924 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1925 {
1926   // current is not a primitive or array class
1927   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1928   InstanceKlass* host = c->nest_host(THREAD);
1929   return (jclass) (host == nullptr ? nullptr :
1930                    JNIHandles::make_local(THREAD, host->java_mirror()));
1931 }
1932 JVM_END
1933 
1934 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1935 {
1936   // current is not a primitive or array class
1937   ResourceMark rm(THREAD);
1938   InstanceKlass* c = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(current));
1939   InstanceKlass* host = c->nest_host(THREAD);
1940 
1941   log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1942                               c->external_name(), host->external_name());
1943   {
1944     JvmtiVMObjectAllocEventCollector oam;
1945     Array<u2>* members = host->nest_members();
1946     int length = members == nullptr ? 0 : members->length();
1947 
1948     log_trace(class, nestmates)(" - host has %d listed nest members", length);
1949 
1950     // nest host is first in the array so make it one bigger
1951     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1952                                              length + 1, CHECK_NULL);
1953     objArrayHandle result(THREAD, r);
1954     result->obj_at_put(0, host->java_mirror());
1955     if (length != 0) {
1956       int count = 0;
1957       for (int i = 0; i < length; i++) {
1958         int cp_index = members->at(i);
1959         Klass* k = host->constants()->klass_at(cp_index, THREAD);
1960         if (HAS_PENDING_EXCEPTION) {
1961           if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1962             return nullptr; // propagate VMEs
1963           }
1964           if (log_is_enabled(Trace, class, nestmates)) {
1965             stringStream ss;
1966             char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1967             ss.print(" - resolution of nest member %s failed: ", target_member_class);
1968             java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1969             log_trace(class, nestmates)("%s", ss.as_string());
1970           }
1971           CLEAR_PENDING_EXCEPTION;
1972           continue;
1973         }
1974         if (k->is_instance_klass()) {
1975           InstanceKlass* ik = InstanceKlass::cast(k);
1976           InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1977           if (nest_host_k == host) {
1978             result->obj_at_put(count+1, k->java_mirror());
1979             count++;
1980             log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1981           } else {
1982             log_trace(class, nestmates)(" - skipping member %s with different host %s",
1983                                         ik->external_name(), nest_host_k->external_name());
1984           }
1985         } else {
1986           log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1987                                       k->external_name());
1988         }
1989       }
1990       if (count < length) {
1991         // we had invalid entries so we need to compact the array
1992         log_trace(class, nestmates)(" - compacting array from length %d to %d",
1993                                     length + 1, count + 1);
1994 
1995         objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1996                                                   count + 1, CHECK_NULL);
1997         objArrayHandle result2(THREAD, r2);
1998         for (int i = 0; i < count + 1; i++) {
1999           result2->obj_at_put(i, result->obj_at(i));
2000         }
2001         return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2002       }
2003     }
2004     else {
2005       assert(host == c || c->is_hidden(), "must be singleton nest or dynamic nestmate");
2006     }
2007     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2008   }
2009 }
2010 JVM_END
2011 
2012 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2013 {
2014   oop mirror = JNIHandles::resolve_non_null(current);
2015   assert(!java_lang_Class::is_primitive(mirror), "should not be");
2016   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
2017 
2018   ResourceMark rm(THREAD);
2019   log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2020                            ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2021   if (ik->is_sealed()) {
2022     JvmtiVMObjectAllocEventCollector oam;
2023     Array<u2>* subclasses = ik->permitted_subclasses();
2024     int length = subclasses->length();
2025 
2026     log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2027 
2028     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2029                                              length, CHECK_NULL);
2030     objArrayHandle result(THREAD, r);
2031     int count = 0;
2032     for (int i = 0; i < length; i++) {
2033       int cp_index = subclasses->at(i);
2034       Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2035       if (HAS_PENDING_EXCEPTION) {
2036         if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2037           return nullptr; // propagate VMEs
2038         }
2039         if (log_is_enabled(Trace, class, sealed)) {
2040           stringStream ss;
2041           char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2042           ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2043           java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2044           log_trace(class, sealed)("%s", ss.as_string());
2045         }
2046 
2047         CLEAR_PENDING_EXCEPTION;
2048         continue;
2049       }
2050       if (k->is_instance_klass()) {
2051         result->obj_at_put(count++, k->java_mirror());
2052         log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2053       }
2054     }
2055     if (count < length) {
2056       // we had invalid entries so we need to compact the array
2057       objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2058                                                 count, CHECK_NULL);
2059       objArrayHandle result2(THREAD, r2);
2060       for (int i = 0; i < count; i++) {
2061         result2->obj_at_put(i, result->obj_at(i));
2062       }
2063       return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2064     }
2065     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2066   } else {
2067     return nullptr;
2068   }
2069 }
2070 JVM_END
2071 
2072 // Constant pool access //////////////////////////////////////////////////////////
2073 
2074 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2075 {
2076   JvmtiVMObjectAllocEventCollector oam;
2077   oop mirror = JNIHandles::resolve_non_null(cls);
2078   // Return null for primitives and arrays
2079   if (!java_lang_Class::is_primitive(mirror)) {
2080     Klass* k = java_lang_Class::as_Klass(mirror);
2081     if (k->is_instance_klass()) {
2082       InstanceKlass* k_h = InstanceKlass::cast(k);
2083       Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2084       reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2085       return JNIHandles::make_local(THREAD, jcp());
2086     }
2087   }
2088   return nullptr;
2089 }
2090 JVM_END
2091 
2092 
2093 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj))
2094 {
2095   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2096   return cp->length();
2097 }
2098 JVM_END
2099 
2100 
2101 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jint index))
2102 {
2103   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2104   bounds_check(cp, index, CHECK_NULL);
2105   constantTag tag = cp->tag_at(index);
2106   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2107     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2108   }
2109   Klass* k = cp->klass_at(index, CHECK_NULL);
2110   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2111 }
2112 JVM_END
2113 
2114 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2115 {
2116   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2117   bounds_check(cp, index, CHECK_NULL);
2118   constantTag tag = cp->tag_at(index);
2119   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2120     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2121   }
2122   Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2123   if (k == nullptr) return nullptr;
2124   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2125 }
2126 JVM_END
2127 
2128 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2129   constantTag tag = cp->tag_at(index);
2130   if (!tag.is_method() && !tag.is_interface_method()) {
2131     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2132   }
2133   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2134   Klass* k_o;
2135   if (force_resolution) {
2136     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2137   } else {
2138     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2139     if (k_o == nullptr) return nullptr;
2140   }
2141   InstanceKlass* k = InstanceKlass::cast(k_o);
2142   Symbol* name = cp->uncached_name_ref_at(index);
2143   Symbol* sig  = cp->uncached_signature_ref_at(index);
2144   methodHandle m (THREAD, k->find_method(name, sig));
2145   if (m.is_null()) {
2146     THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2147   }
2148   oop method;
2149   if (m->is_object_constructor()) {
2150     method = Reflection::new_constructor(m, CHECK_NULL);
2151   } else {

2152     method = Reflection::new_method(m, true, CHECK_NULL);
2153   }
2154   return JNIHandles::make_local(THREAD, method);
2155 }
2156 
2157 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jint index))
2158 {
2159   JvmtiVMObjectAllocEventCollector oam;
2160   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2161   bounds_check(cp, index, CHECK_NULL);
2162   jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2163   return res;
2164 }
2165 JVM_END
2166 
2167 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2168 {
2169   JvmtiVMObjectAllocEventCollector oam;
2170   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2171   bounds_check(cp, index, CHECK_NULL);
2172   jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2173   return res;
2174 }
2175 JVM_END
2176 
2177 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2178   constantTag tag = cp->tag_at(index);
2179   if (!tag.is_field()) {
2180     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2181   }
2182   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2183   Klass* k_o;
2184   if (force_resolution) {
2185     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2186   } else {
2187     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2188     if (k_o == nullptr) return nullptr;
2189   }
2190   InstanceKlass* k = InstanceKlass::cast(k_o);
2191   Symbol* name = cp->uncached_name_ref_at(index);
2192   Symbol* sig  = cp->uncached_signature_ref_at(index);
2193   fieldDescriptor fd;
2194   Klass* target_klass = k->find_field(name, sig, &fd);
2195   if (target_klass == nullptr) {
2196     THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2197   }
2198   oop field = Reflection::new_field(&fd, CHECK_NULL);
2199   return JNIHandles::make_local(THREAD, field);
2200 }
2201 
2202 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jint index))
2203 {
2204   JvmtiVMObjectAllocEventCollector oam;
2205   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2206   bounds_check(cp, index, CHECK_NULL);
2207   jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2208   return res;
2209 }
2210 JVM_END
2211 
2212 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jint index))
2213 {
2214   JvmtiVMObjectAllocEventCollector oam;
2215   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2216   bounds_check(cp, index, CHECK_NULL);
2217   jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2218   return res;
2219 }
2220 JVM_END
2221 
2222 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jint index))
2223 {
2224   JvmtiVMObjectAllocEventCollector oam;
2225   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2226   bounds_check(cp, index, CHECK_NULL);
2227   constantTag tag = cp->tag_at(index);
2228   if (!tag.is_field_or_method()) {
2229     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2230   }
2231   int klass_ref = cp->uncached_klass_ref_index_at(index);
2232   Symbol*  klass_name  = cp->klass_name_at(klass_ref);
2233   Symbol*  member_name = cp->uncached_name_ref_at(index);
2234   Symbol*  member_sig  = cp->uncached_signature_ref_at(index);
2235   objArrayOop  dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2236   objArrayHandle dest(THREAD, dest_o);
2237   Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2238   dest->obj_at_put(0, str());
2239   str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2240   dest->obj_at_put(1, str());
2241   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2242   dest->obj_at_put(2, str());
2243   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2244 }
2245 JVM_END
2246 
2247 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jint index))
2248 {
2249   JvmtiVMObjectAllocEventCollector oam;
2250   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2251   bounds_check(cp, index, CHECK_0);
2252   constantTag tag = cp->tag_at(index);
2253   if (!tag.is_field_or_method()) {
2254     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2255   }
2256   return (jint) cp->uncached_klass_ref_index_at(index);
2257 }
2258 JVM_END
2259 
2260 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jint index))
2261 {
2262   JvmtiVMObjectAllocEventCollector oam;
2263   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2264   bounds_check(cp, index, CHECK_0);
2265   constantTag tag = cp->tag_at(index);
2266   if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2267     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2268   }
2269   return (jint) cp->uncached_name_and_type_ref_index_at(index);
2270 }
2271 JVM_END
2272 
2273 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jint index))
2274 {
2275   JvmtiVMObjectAllocEventCollector oam;
2276   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2277   bounds_check(cp, index, CHECK_NULL);
2278   constantTag tag = cp->tag_at(index);
2279   if (!tag.is_name_and_type()) {
2280     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2281   }
2282   Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2283   Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2284   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2285   objArrayHandle dest(THREAD, dest_o);
2286   Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2287   dest->obj_at_put(0, str());
2288   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2289   dest->obj_at_put(1, str());
2290   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2291 }
2292 JVM_END
2293 
2294 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jint index))
2295 {
2296   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2297   bounds_check(cp, index, CHECK_0);
2298   constantTag tag = cp->tag_at(index);
2299   if (!tag.is_int()) {
2300     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2301   }
2302   return cp->int_at(index);
2303 }
2304 JVM_END
2305 
2306 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jint index))
2307 {
2308   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2309   bounds_check(cp, index, CHECK_(0L));
2310   constantTag tag = cp->tag_at(index);
2311   if (!tag.is_long()) {
2312     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2313   }
2314   return cp->long_at(index);
2315 }
2316 JVM_END
2317 
2318 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jint index))
2319 {
2320   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2321   bounds_check(cp, index, CHECK_(0.0f));
2322   constantTag tag = cp->tag_at(index);
2323   if (!tag.is_float()) {
2324     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2325   }
2326   return cp->float_at(index);
2327 }
2328 JVM_END
2329 
2330 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jint index))
2331 {
2332   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2333   bounds_check(cp, index, CHECK_(0.0));
2334   constantTag tag = cp->tag_at(index);
2335   if (!tag.is_double()) {
2336     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2337   }
2338   return cp->double_at(index);
2339 }
2340 JVM_END
2341 
2342 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jint index))
2343 {
2344   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2345   bounds_check(cp, index, CHECK_NULL);
2346   constantTag tag = cp->tag_at(index);
2347   if (!tag.is_string()) {
2348     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2349   }
2350   oop str = cp->string_at(index, CHECK_NULL);
2351   return (jstring) JNIHandles::make_local(THREAD, str);
2352 }
2353 JVM_END
2354 
2355 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jint index))
2356 {
2357   JvmtiVMObjectAllocEventCollector oam;
2358   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2359   bounds_check(cp, index, CHECK_NULL);
2360   constantTag tag = cp->tag_at(index);
2361   if (!tag.is_symbol()) {
2362     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2363   }
2364   Symbol* sym = cp->symbol_at(index);
2365   Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2366   return (jstring) JNIHandles::make_local(THREAD, str());
2367 }
2368 JVM_END
2369 
2370 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jint index))
2371 {
2372   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2373   bounds_check(cp, index, CHECK_0);
2374   constantTag tag = cp->tag_at(index);
2375   jbyte result = tag.value();
2376   // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2377   // they are changed to the corresponding tags from the JVM spec, so that java code in
2378   // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2379   if (tag.is_klass_or_reference()) {
2380       result = JVM_CONSTANT_Class;
2381   } else if (tag.is_string_index()) {
2382       result = JVM_CONSTANT_String;
2383   } else if (tag.is_method_type_in_error()) {
2384       result = JVM_CONSTANT_MethodType;
2385   } else if (tag.is_method_handle_in_error()) {
2386       result = JVM_CONSTANT_MethodHandle;
2387   } else if (tag.is_dynamic_constant_in_error()) {
2388       result = JVM_CONSTANT_Dynamic;
2389   }
2390   return result;
2391 }
2392 JVM_END
2393 
2394 // Assertion support. //////////////////////////////////////////////////////////
2395 
2396 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2397   assert(cls != nullptr, "bad class");
2398 
2399   oop r = JNIHandles::resolve(cls);
2400   assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2401   if (java_lang_Class::is_primitive(r)) return false;
2402 
2403   Klass* k = java_lang_Class::as_Klass(r);
2404   assert(k->is_instance_klass(), "must be an instance klass");
2405   if (!k->is_instance_klass()) return false;
2406 
2407   ResourceMark rm(THREAD);
2408   const char* name = k->name()->as_C_string();
2409   bool system_class = k->class_loader() == nullptr;
2410   return JavaAssertions::enabled(name, system_class);
2411 
2412 JVM_END
2413 
2414 
2415 // Return a new AssertionStatusDirectives object with the fields filled in with
2416 // command-line assertion arguments (i.e., -ea, -da).
2417 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2418   JvmtiVMObjectAllocEventCollector oam;
2419   oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2420   return JNIHandles::make_local(THREAD, asd);
2421 JVM_END
2422 
2423 // Verification ////////////////////////////////////////////////////////////////////////////////
2424 
2425 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2426 
2427 // RedefineClasses support: bug 6214132 caused verification to fail.
2428 // All functions from this section, unless noted otherwise, should call the functions
2429 //   get_klass_considering_redefinition(), or
2430 //   get_instance_klass_considering_redefinition()
2431 // These functions return JvmtiThreadState::_scratch_class if the verifier
2432 // was invoked in the middle of the redefinition of cls.
2433 // See jvmtiThreadState.hpp for details.
2434 
2435 inline Klass* get_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2436   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2437   if (k->is_instance_klass()) {
2438     return JvmtiThreadState::class_to_verify_considering_redefinition(InstanceKlass::cast(k), thread);
2439   } else {
2440     return k;
2441   }
2442 }
2443 
2444 inline InstanceKlass* get_instance_klass_considering_redefinition(jclass cls, JavaThread* thread) {
2445   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve_non_null(cls));
2446   return JvmtiThreadState::class_to_verify_considering_redefinition(ik, thread);
2447 }
2448 
2449 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
2450   oop mirror = JNIHandles::resolve_non_null(cls);
2451   if (java_lang_Class::is_primitive(mirror)) {
2452     return JNI_FALSE;
2453   }
2454   Klass* k = java_lang_Class::as_Klass(mirror);
2455   // This isn't necessary since answer is the same because redefinition
2456   // has already checked this matches for the scratch class.
2457   // k = get_klass_considering_redefinition(cls, thread)
2458   jboolean result = k->is_interface();
2459   assert(!result || k->is_instance_klass(),
2460          "all interfaces are instance types");
2461   return result;
2462 JVM_END
2463 
2464 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2465   // No need to call get_klass_considering_redefinition() as redefinition cannot change a class's name.
2466   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2467   return k->name()->as_utf8();
2468 JVM_END
2469 
2470 
2471 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2472   Klass* k = get_klass_considering_redefinition(cls, thread);
2473   // types will have length zero if this is not an InstanceKlass
2474   // (length is determined by call to JVM_GetClassCPEntriesCount)
2475   if (k->is_instance_klass()) {
2476     ConstantPool* cp = InstanceKlass::cast(k)->constants();
2477     for (int index = cp->length() - 1; index >= 0; index--) {
2478       constantTag tag = cp->tag_at(index);
2479       types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2480     }
2481   }
2482 JVM_END
2483 
2484 
2485 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2486   Klass* k = get_klass_considering_redefinition(cls, thread);
2487   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2488 JVM_END
2489 
2490 
2491 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2492   Klass* k = get_klass_considering_redefinition(cls, thread);
2493   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2494 JVM_END
2495 
2496 
2497 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2498   Klass* k = get_klass_considering_redefinition(cls, thread);
2499   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2500 JVM_END
2501 
2502 
2503 // The following methods, used for the verifier, are never called with
2504 // array klasses, so a direct cast to InstanceKlass is safe.
2505 // Typically, these methods are called in a loop with bounds determined
2506 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2507 // zero for arrays.
2508 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2509   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2510   Method* method = ik->methods()->at(method_index);
2511   int length = method->checked_exceptions_length();
2512   if (length > 0) {
2513     CheckedExceptionElement* table= method->checked_exceptions_start();
2514     for (int i = 0; i < length; i++) {
2515       exceptions[i] = table[i].class_cp_index;
2516     }
2517   }
2518 JVM_END
2519 
2520 
2521 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2522   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2523   Method* method = ik->methods()->at(method_index);
2524   return method->checked_exceptions_length();
2525 JVM_END
2526 
2527 
2528 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2529   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2530   Method* method = ik->methods()->at(method_index);
2531   memcpy(code, method->code_base(), method->code_size());
2532 JVM_END
2533 
2534 
2535 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2536   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2537   Method* method = ik->methods()->at(method_index);
2538   return method->code_size();
2539 JVM_END
2540 
2541 
2542 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2543   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2544   Method* method = ik->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   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2555   Method* method = ik->methods()->at(method_index);
2556   return method->exception_table_length();
2557 JVM_END
2558 
2559 
2560 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2561   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2562   Method* method = ik->methods()->at(method_index);
2563   return method->access_flags().as_method_flags();
2564 JVM_END
2565 
2566 
2567 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2568   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2569   return ik->field_access_flags(field_index);
2570 JVM_END
2571 
2572 
2573 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2574   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2575   Method* method = ik->methods()->at(method_index);
2576   return method->max_locals();
2577 JVM_END
2578 
2579 
2580 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2581   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2582   Method* method = ik->methods()->at(method_index);
2583   return method->size_of_parameters();
2584 JVM_END
2585 
2586 
2587 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2588   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2589   Method* method = ik->methods()->at(method_index);
2590   return method->verifier_max_stack();
2591 JVM_END
2592 
2593 
2594 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2595   ResourceMark rm(THREAD);
2596   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2597   Method* method = ik->methods()->at(method_index);
2598   return method->is_object_constructor();
2599 JVM_END
2600 
2601 
2602 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2603   ResourceMark rm(THREAD);
2604   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2605   Method* method = ik->methods()->at(method_index);
2606   return method->is_overpass();
2607 JVM_END
2608 
2609 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2610   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2611   Method* method = ik->methods()->at(method_index);
2612   return method->name()->as_utf8();
2613 JVM_END
2614 
2615 
2616 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2617   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2618   Method* method = ik->methods()->at(method_index);
2619   return method->signature()->as_utf8();
2620 JVM_END
2621 
2622 /**
2623  * All of these JVM_GetCP-xxx methods are used by the old verifier to
2624  * read entries in the constant pool.  Since the old verifier always
2625  * works on a copy of the code, it will not see any rewriting that
2626  * may possibly occur in the middle of verification.  So it is important
2627  * that nothing it calls tries to use the cpCache instead of the raw
2628  * constant pool, so we must use cp->uncached_x methods when appropriate.
2629  */
2630 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2631   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2632   ConstantPool* cp = ik->constants();
2633   switch (cp->tag_at(cp_index).value()) {
2634     case JVM_CONSTANT_Fieldref:
2635       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2636     default:
2637       fatal("JVM_GetCPFieldNameUTF: illegal constant");
2638   }
2639   ShouldNotReachHere();
2640   return nullptr;
2641 JVM_END
2642 
2643 
2644 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2645   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2646   ConstantPool* cp = ik->constants();
2647   switch (cp->tag_at(cp_index).value()) {
2648     case JVM_CONSTANT_InterfaceMethodref:
2649     case JVM_CONSTANT_Methodref:
2650       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2651     default:
2652       fatal("JVM_GetCPMethodNameUTF: illegal constant");
2653   }
2654   ShouldNotReachHere();
2655   return nullptr;
2656 JVM_END
2657 
2658 
2659 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2660   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2661   ConstantPool* cp = ik->constants();
2662   switch (cp->tag_at(cp_index).value()) {
2663     case JVM_CONSTANT_InterfaceMethodref:
2664     case JVM_CONSTANT_Methodref:
2665       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2666     default:
2667       fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2668   }
2669   ShouldNotReachHere();
2670   return nullptr;
2671 JVM_END
2672 
2673 
2674 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2675   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2676   ConstantPool* cp = ik->constants();
2677   switch (cp->tag_at(cp_index).value()) {
2678     case JVM_CONSTANT_Fieldref:
2679       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2680     default:
2681       fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2682   }
2683   ShouldNotReachHere();
2684   return nullptr;
2685 JVM_END
2686 
2687 
2688 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2689   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2690   ConstantPool* cp = ik->constants();
2691   Symbol* classname = cp->klass_name_at(cp_index);
2692   return classname->as_utf8();
2693 JVM_END
2694 
2695 
2696 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2697   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2698   ConstantPool* cp = ik->constants();
2699   switch (cp->tag_at(cp_index).value()) {
2700     case JVM_CONSTANT_Fieldref: {
2701       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2702       Symbol* classname = cp->klass_name_at(class_index);
2703       return classname->as_utf8();
2704     }
2705     default:
2706       fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2707   }
2708   ShouldNotReachHere();
2709   return nullptr;
2710 JVM_END
2711 
2712 
2713 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2714   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2715   ConstantPool* cp = ik->constants();
2716   switch (cp->tag_at(cp_index).value()) {
2717     case JVM_CONSTANT_Methodref:
2718     case JVM_CONSTANT_InterfaceMethodref: {
2719       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2720       Symbol* classname = cp->klass_name_at(class_index);
2721       return classname->as_utf8();
2722     }
2723     default:
2724       fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2725   }
2726   ShouldNotReachHere();
2727   return nullptr;
2728 JVM_END
2729 
2730 
2731 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2732   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2733   InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2734   ConstantPool* cp = ik->constants();
2735   ConstantPool* cp_called = ik_called->constants();
2736   switch (cp->tag_at(cp_index).value()) {
2737     case JVM_CONSTANT_Fieldref: {
2738       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2739       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2740       for (JavaFieldStream fs(ik_called); !fs.done(); fs.next()) {
2741         if (fs.name() == name && fs.signature() == signature) {
2742           return fs.access_flags().as_field_flags();
2743         }
2744       }
2745       return -1;
2746     }
2747     default:
2748       fatal("JVM_GetCPFieldModifiers: illegal constant");
2749   }
2750   ShouldNotReachHere();
2751   return 0;
2752 JVM_END
2753 
2754 
2755 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2756   InstanceKlass* ik = get_instance_klass_considering_redefinition(cls, thread);
2757   InstanceKlass* ik_called = get_instance_klass_considering_redefinition(called_cls, thread);
2758   ConstantPool* cp = ik->constants();
2759   switch (cp->tag_at(cp_index).value()) {
2760     case JVM_CONSTANT_Methodref:
2761     case JVM_CONSTANT_InterfaceMethodref: {
2762       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2763       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2764       Array<Method*>* methods = ik_called->methods();
2765       int methods_count = methods->length();
2766       for (int i = 0; i < methods_count; i++) {
2767         Method* method = methods->at(i);
2768         if (method->name() == name && method->signature() == signature) {
2769             return method->access_flags().as_method_flags();
2770         }
2771       }
2772       return -1;
2773     }
2774     default:
2775       fatal("JVM_GetCPMethodModifiers: illegal constant");
2776   }
2777   ShouldNotReachHere();
2778   return 0;
2779 JVM_END
2780 
2781 
2782 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2783 
2784 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2785   // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2786 JVM_END
2787 
2788 
2789 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2790   oop class1_mirror = JNIHandles::resolve_non_null(class1);
2791   oop class2_mirror = JNIHandles::resolve_non_null(class2);
2792   Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2793   Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2794   return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2795 JVM_END
2796 
2797 // Printing support //////////////////////////////////////////////////
2798 extern "C" {
2799 
2800 ATTRIBUTE_PRINTF(3, 0)
2801 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2802   // Reject count values that are negative signed values converted to
2803   // unsigned; see bug 4399518, 4417214
2804   if ((intptr_t)count <= 0) return -1;
2805 
2806   int result = os::vsnprintf(str, count, fmt, args);
2807   if (result > 0 && (size_t)result >= count) {
2808     result = -1;
2809   }
2810 
2811   return result;
2812 }
2813 
2814 ATTRIBUTE_PRINTF(3, 4)
2815 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2816   va_list args;
2817   int len;
2818   va_start(args, fmt);
2819   len = jio_vsnprintf(str, count, fmt, args);
2820   va_end(args);
2821   return len;
2822 }
2823 
2824 ATTRIBUTE_PRINTF(2, 3)
2825 int jio_fprintf(FILE* f, const char *fmt, ...) {
2826   int len;
2827   va_list args;
2828   va_start(args, fmt);
2829   len = jio_vfprintf(f, fmt, args);
2830   va_end(args);
2831   return len;
2832 }
2833 
2834 ATTRIBUTE_PRINTF(2, 0)
2835 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2836   if (Arguments::vfprintf_hook() != nullptr) {
2837      return Arguments::vfprintf_hook()(f, fmt, args);
2838   } else {
2839     return vfprintf(f, fmt, args);
2840   }
2841 }
2842 
2843 ATTRIBUTE_PRINTF(1, 2)
2844 JNIEXPORT int jio_printf(const char *fmt, ...) {
2845   int len;
2846   va_list args;
2847   va_start(args, fmt);
2848   len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2849   va_end(args);
2850   return len;
2851 }
2852 
2853 // HotSpot specific jio method
2854 void jio_print(const char* s, size_t len) {
2855   // Try to make this function as atomic as possible.
2856   if (Arguments::vfprintf_hook() != nullptr) {
2857     jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2858   } else {
2859     // Make an unused local variable to avoid warning from gcc compiler.
2860     bool dummy = os::write(defaultStream::output_fd(), s, len);
2861   }
2862 }
2863 
2864 } // Extern C
2865 
2866 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2867 
2868 // In most of the JVM thread support functions we need to access the
2869 // thread through a ThreadsListHandle to prevent it from exiting and
2870 // being reclaimed while we try to operate on it. The exceptions to this
2871 // rule are when operating on the current thread, or if the monitor of
2872 // the target java.lang.Thread is locked at the Java level - in both
2873 // cases the target cannot exit.
2874 
2875 static void thread_entry(JavaThread* thread, TRAPS) {
2876   HandleMark hm(THREAD);
2877   Handle obj(THREAD, thread->threadObj());
2878   JavaValue result(T_VOID);
2879   JavaCalls::call_virtual(&result,
2880                           obj,
2881                           vmClasses::Thread_klass(),
2882                           vmSymbols::run_method_name(),
2883                           vmSymbols::void_method_signature(),
2884                           THREAD);
2885 }
2886 
2887 
2888 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2889 #if INCLUDE_CDS
2890   if (CDSConfig::allow_only_single_java_thread()) {
2891     // During java -Xshare:dump, if we allow multiple Java threads to
2892     // execute in parallel, symbols and classes may be loaded in
2893     // random orders which will make the resulting CDS archive
2894     // non-deterministic.
2895     //
2896     // Lucikly, during java -Xshare:dump, it's important to run only
2897     // the code in the main Java thread (which is NOT started here) that
2898     // creates the module graph, etc. It's safe to not start the other
2899     // threads which are launched by class static initializers
2900     // (ReferenceHandler, FinalizerThread and CleanerImpl).
2901     if (log_is_enabled(Info, aot)) {
2902       ResourceMark rm;
2903       oop t = JNIHandles::resolve_non_null(jthread);
2904       log_info(aot)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2905     }
2906     return;
2907   }
2908 #endif
2909   JavaThread *native_thread = nullptr;
2910 
2911   // We cannot hold the Threads_lock when we throw an exception,
2912   // due to rank ordering issues. Example:  we might need to grab the
2913   // Heap_lock while we construct the exception.
2914   bool throw_illegal_thread_state = false;
2915 
2916   // We must release the Threads_lock before we can post a jvmti event
2917   // in Thread::start.
2918   {
2919     ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2920     // Ensure that the C++ Thread and OSThread structures aren't freed before
2921     // we operate.
2922     MutexLocker ml(Threads_lock);
2923 
2924     // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2925     // re-starting an already started thread, so we should usually find
2926     // that the JavaThread is null. However for a JNI attached thread
2927     // there is a small window between the Thread object being created
2928     // (with its JavaThread set) and the update to its threadStatus, so we
2929     // have to check for this
2930     if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2931       throw_illegal_thread_state = true;
2932     } else {
2933       jlong size =
2934              java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2935       // Allocate the C++ Thread structure and create the native thread.  The
2936       // stack size retrieved from java is 64-bit signed, but the constructor takes
2937       // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2938       //  - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2939       //  - Avoid passing negative values which would result in really large stacks.
2940       NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2941       size_t sz = size > 0 ? (size_t) size : 0;
2942       native_thread = new JavaThread(&thread_entry, sz);
2943 
2944       // At this point it may be possible that no osthread was created for the
2945       // JavaThread due to lack of memory. Check for this situation and throw
2946       // an exception if necessary. Eventually we may want to change this so
2947       // that we only grab the lock if the thread was created successfully -
2948       // then we can also do this check and throw the exception in the
2949       // JavaThread constructor.
2950       if (native_thread->osthread() != nullptr) {
2951         // Note: the current thread is not being used within "prepare".
2952         native_thread->prepare(jthread);
2953       }
2954     }
2955   }
2956 
2957   if (throw_illegal_thread_state) {
2958     THROW(vmSymbols::java_lang_IllegalThreadStateException());
2959   }
2960 
2961   assert(native_thread != nullptr, "Starting null thread?");
2962 
2963   if (native_thread->osthread() == nullptr) {
2964     ResourceMark rm(thread);
2965     log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2966                             JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2967     // No one should hold a reference to the 'native_thread'.
2968     native_thread->smr_delete();
2969     if (JvmtiExport::should_post_resource_exhausted()) {
2970       JvmtiExport::post_resource_exhausted(
2971         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2972         os::native_thread_creation_failed_msg());
2973     }
2974     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2975               os::native_thread_creation_failed_msg());
2976   }
2977 
2978   JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2979 
2980   Thread::start(native_thread);
2981 
2982 JVM_END
2983 
2984 
2985 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
2986   ThreadsListHandle tlh(thread);
2987   oop java_thread = nullptr;
2988   JavaThread* receiver = nullptr;
2989   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2990   java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
2991 
2992   if (is_alive) {
2993     // jthread refers to a live JavaThread.
2994     Thread::set_priority(receiver, (ThreadPriority)prio);
2995   }
2996   // Implied else: If the JavaThread hasn't started yet, then the
2997   // priority set in the java.lang.Thread object above will be pushed
2998   // down when it does start.
2999 JVM_END
3000 
3001 
3002 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3003   HOTSPOT_THREAD_YIELD();
3004   os::naked_yield();
3005 JVM_END
3006 
3007 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3008   if (nanos < 0) {
3009     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3010   }
3011 
3012   if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3013     THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3014   }
3015 
3016   // Save current thread state and restore it at the end of this block.
3017   // And set new thread state to SLEEPING.
3018   JavaThreadSleepState jtss(thread);
3019 
3020   HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3021 
3022   if (nanos == 0) {
3023     os::naked_yield();
3024   } else {
3025     ThreadState old_state = thread->osthread()->get_state();
3026     thread->osthread()->set_state(SLEEPING);
3027     if (!thread->sleep_nanos(nanos)) { // interrupted or async exception was installed
3028       // An asynchronous exception could have been thrown on
3029       // us while we were sleeping. We do not overwrite those.
3030       if (!HAS_PENDING_EXCEPTION) {
3031         HOTSPOT_THREAD_SLEEP_END(1);
3032         if (!thread->has_async_exception_condition()) {
3033           // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3034           // to properly restore the thread state.  That's likely wrong.
3035           THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3036         }
3037       }
3038     }
3039     thread->osthread()->set_state(old_state);
3040   }
3041   HOTSPOT_THREAD_SLEEP_END(0);
3042 JVM_END
3043 
3044 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3045   oop jthread = thread->threadObj();
3046   assert(jthread != nullptr, "no current carrier thread!");
3047   return JNIHandles::make_local(THREAD, jthread);
3048 JVM_END
3049 
3050 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3051   oop theThread = thread->vthread();
3052   assert(theThread != (oop)nullptr, "no current thread!");
3053   return JNIHandles::make_local(THREAD, theThread);
3054 JVM_END
3055 
3056 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3057                                      jobject theThread))
3058   oop threadObj = JNIHandles::resolve(theThread);
3059   thread->set_vthread(threadObj);
3060 
3061   // Set _monitor_owner_id of new current Thread
3062   thread->set_monitor_owner_id(java_lang_Thread::thread_id(threadObj));
3063 
3064   JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3065 JVM_END
3066 
3067 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3068   return ThreadIdentifier::unsafe_offset();
3069 JVM_END
3070 
3071 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3072   ThreadsListHandle tlh(thread);
3073   JavaThread* receiver = nullptr;
3074   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3075   if (is_alive) {
3076     // jthread refers to a live JavaThread.
3077     receiver->interrupt();
3078   }
3079 JVM_END
3080 
3081 // Return true iff the current thread has locked the object passed in
3082 
3083 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3084   if (obj == nullptr) {
3085     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3086   }
3087   Handle h_obj(THREAD, JNIHandles::resolve(obj));
3088   return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3089 JVM_END
3090 
3091 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3092   oop trace = java_lang_Thread::async_get_stack_trace(jthread, THREAD);
3093   return JNIHandles::make_local(THREAD, trace);
3094 JVM_END
3095 
3096 JVM_ENTRY(jobject, JVM_CreateThreadSnapshot(JNIEnv* env, jobject jthread))
3097 #if INCLUDE_JVMTI
3098   oop snapshot = ThreadSnapshotFactory::get_thread_snapshot(jthread, THREAD);
3099   return JNIHandles::make_local(THREAD, snapshot);
3100 #else
3101   THROW_NULL(vmSymbols::java_lang_UnsupportedOperationException());
3102 #endif
3103 JVM_END
3104 
3105 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3106   // We don't use a ThreadsListHandle here because the current thread
3107   // must be alive.
3108   oop java_thread = JNIHandles::resolve_non_null(jthread);
3109   JavaThread* thr = java_lang_Thread::thread(java_thread);
3110   if (thread == thr && !thr->has_attached_via_jni()) {
3111     // Thread naming is only supported for the current thread and
3112     // we don't set the name of an attached thread to avoid stepping
3113     // on other programs.
3114     ResourceMark rm(thread);
3115     const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3116     os::set_native_thread_name(thread_name);
3117   }
3118 JVM_END
3119 
3120 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3121   oop theCache = thread->scopedValueCache();
3122   return JNIHandles::make_local(THREAD, theCache);
3123 JVM_END
3124 
3125 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3126                                        jobject theCache))
3127   arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3128   thread->set_scopedValueCache(objs);
3129 JVM_END
3130 
3131 
3132 // java.lang.Package ////////////////////////////////////////////////////////////////
3133 
3134 
3135 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3136   ResourceMark rm(THREAD);
3137   JvmtiVMObjectAllocEventCollector oam;
3138   char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3139   oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3140 return (jstring) JNIHandles::make_local(THREAD, result);
3141 JVM_END
3142 
3143 
3144 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3145   JvmtiVMObjectAllocEventCollector oam;
3146   objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3147   return (jobjectArray) JNIHandles::make_local(THREAD, result);
3148 JVM_END
3149 
3150 
3151 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3152 
3153 
3154 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3155   MonitorLocker ml(Heap_lock);
3156   oop ref = Universe::reference_pending_list();
3157   if (ref != nullptr) {
3158     Universe::clear_reference_pending_list();
3159   }
3160   return JNIHandles::make_local(THREAD, ref);
3161 JVM_END
3162 
3163 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3164   MonitorLocker ml(Heap_lock);
3165   return Universe::has_reference_pending_list();
3166 JVM_END
3167 
3168 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3169   MonitorLocker ml(Heap_lock);
3170   while (!Universe::has_reference_pending_list()) {
3171     ml.wait();
3172   }
3173 JVM_END
3174 
3175 JVM_ENTRY(jobject, JVM_ReferenceGet(JNIEnv* env, jobject ref))
3176   oop ref_oop = JNIHandles::resolve_non_null(ref);
3177   // PhantomReference has its own implementation of get().
3178   assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3179   oop referent = java_lang_ref_Reference::weak_referent(ref_oop);
3180   return JNIHandles::make_local(THREAD, referent);
3181 JVM_END
3182 
3183 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3184   oop ref_oop = JNIHandles::resolve_non_null(ref);
3185   // PhantomReference has its own implementation of refersTo().
3186   // See: JVM_PhantomReferenceRefersTo
3187   assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3188   oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3189   return referent == JNIHandles::resolve(o);
3190 JVM_END
3191 
3192 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3193   oop ref_oop = JNIHandles::resolve_non_null(ref);
3194   // FinalReference has it's own implementation of clear().
3195   assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3196   if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3197     // If the referent has already been cleared then done.
3198     // However, if the referent is dead but has not yet been cleared by
3199     // concurrent reference processing, it should NOT be cleared here.
3200     // Instead, clearing should be left to the GC.  Clearing it here could
3201     // detectably lose an expected notification, which is impossible with
3202     // STW reference processing.  The clearing in enqueue() doesn't have
3203     // this problem, since the enqueue covers the notification, but it's not
3204     // worth the effort to handle that case specially.
3205     return;
3206   }
3207   java_lang_ref_Reference::clear_referent(ref_oop);
3208 JVM_END
3209 
3210 
3211 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3212 
3213 
3214 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3215   oop ref_oop = JNIHandles::resolve_non_null(ref);
3216   oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3217   return referent == JNIHandles::resolve(o);
3218 JVM_END
3219 
3220 
3221 // ObjectInputStream ///////////////////////////////////////////////////////////////
3222 
3223 // Return the first user-defined class loader up the execution stack, or null
3224 // if only code from the bootstrap or platform class loader is on the stack.
3225 
3226 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3227   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3228     InstanceKlass* ik = vfst.method()->method_holder();
3229     oop loader = ik->class_loader();
3230     if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3231       return JNIHandles::make_local(THREAD, loader);
3232     }
3233   }
3234   return nullptr;
3235 JVM_END
3236 
3237 
3238 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3239 
3240 
3241 // resolve array handle and check arguments
3242 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3243   if (arr == nullptr) {
3244     THROW_NULL(vmSymbols::java_lang_NullPointerException());
3245   }
3246   oop a = JNIHandles::resolve_non_null(arr);
3247   if (!a->is_array()) {
3248     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3249   } else if (type_array_only && !a->is_typeArray()) {
3250     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3251   }
3252   return arrayOop(a);
3253 }
3254 
3255 
3256 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3257   arrayOop a = check_array(env, arr, false, CHECK_0);
3258   return a->length();
3259 JVM_END
3260 
3261 
3262 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3263   JvmtiVMObjectAllocEventCollector oam;
3264   arrayOop a = check_array(env, arr, false, CHECK_NULL);
3265   jvalue value;
3266   BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3267   oop box = Reflection::box(&value, type, CHECK_NULL);
3268   return JNIHandles::make_local(THREAD, box);
3269 JVM_END
3270 
3271 
3272 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3273   jvalue value;
3274   value.i = 0; // to initialize value before getting used in CHECK
3275   arrayOop a = check_array(env, arr, true, CHECK_(value));
3276   assert(a->is_typeArray(), "just checking");
3277   BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3278   BasicType wide_type = (BasicType) wCode;
3279   if (type != wide_type) {
3280     Reflection::widen(&value, type, wide_type, CHECK_(value));
3281   }
3282   return value;
3283 JVM_END
3284 
3285 
3286 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3287   arrayOop a = check_array(env, arr, false, CHECK);
3288   oop box = JNIHandles::resolve(val);
3289   jvalue value;
3290   value.i = 0; // to initialize value before getting used in CHECK
3291   BasicType value_type;
3292   if (a->is_objArray()) {
3293     // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3294     value_type = Reflection::unbox_for_regular_object(box, &value);
3295   } else {
3296     value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3297   }
3298   Reflection::array_set(&value, a, index, value_type, CHECK);
3299 JVM_END
3300 
3301 
3302 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3303   arrayOop a = check_array(env, arr, true, CHECK);
3304   assert(a->is_typeArray(), "just checking");
3305   BasicType value_type = (BasicType) vCode;
3306   Reflection::array_set(&v, a, index, value_type, CHECK);
3307 JVM_END
3308 
3309 
3310 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3311   JvmtiVMObjectAllocEventCollector oam;
3312   oop element_mirror = JNIHandles::resolve(eltClass);
3313   oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3314   return JNIHandles::make_local(THREAD, result);
3315 JVM_END
3316 
3317 
3318 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3319   JvmtiVMObjectAllocEventCollector oam;
3320   arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3321   oop element_mirror = JNIHandles::resolve(eltClass);
3322   assert(dim_array->is_typeArray(), "just checking");
3323   oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3324   return JNIHandles::make_local(THREAD, result);
3325 JVM_END
3326 
3327 
3328 // Library support ///////////////////////////////////////////////////////////////////////////
3329 
3330 JVM_LEAF(void*, JVM_LoadZipLibrary())
3331   return ZipLibrary::handle();
3332 JVM_END
3333 
3334 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3335   //%note jvm_ct
3336   char ebuf[1024];
3337   void *load_result;
3338   {
3339     ThreadToNativeFromVM ttnfvm(thread);
3340     load_result = os::dll_load(name, ebuf, sizeof ebuf);
3341   }
3342   if (load_result == nullptr) {
3343     if (throwException) {
3344       char msg[1024];
3345       jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3346       // Since 'ebuf' may contain a string encoded using
3347       // platform encoding scheme, we need to pass
3348       // Exceptions::unsafe_to_utf8 to the new_exception method
3349       // as the last argument. See bug 6367357.
3350       Handle h_exception =
3351         Exceptions::new_exception(thread,
3352                                   vmSymbols::java_lang_UnsatisfiedLinkError(),
3353                                   msg, Exceptions::unsafe_to_utf8);
3354 
3355       THROW_HANDLE_NULL(h_exception);
3356     } else {
3357       log_info(library)("Failed to load library %s", name);
3358       return load_result;
3359     }
3360   }
3361   log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3362   return load_result;
3363 JVM_END
3364 
3365 
3366 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3367   os::dll_unload(handle);
3368   log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3369 JVM_END
3370 
3371 
3372 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3373   void* find_result = os::dll_lookup(handle, name);
3374   log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3375                     find_result != nullptr ? "Found" : "Failed to find",
3376                     name, p2i(handle));
3377   return find_result;
3378 JVM_END
3379 
3380 
3381 // JNI version ///////////////////////////////////////////////////////////////////////////////
3382 
3383 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3384   return Threads::is_supported_jni_version_including_1_1(version);
3385 JVM_END
3386 
3387 
3388 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3389   return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3390 JVM_END
3391 
3392 JVM_LEAF(jboolean, JVM_IsValhallaEnabled(void))
3393   return EnableValhalla ? JNI_TRUE : JNI_FALSE;
3394 JVM_END
3395 
3396 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3397   return VMContinuations ? JNI_TRUE : JNI_FALSE;
3398 JVM_END
3399 
3400 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3401   return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3402 JVM_END
3403 
3404 JVM_LEAF(jboolean, JVM_IsStaticallyLinked(void))
3405   return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3406 JVM_END
3407 
3408 // String support ///////////////////////////////////////////////////////////////////////////
3409 
3410 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3411   JvmtiVMObjectAllocEventCollector oam;
3412   if (str == nullptr) return nullptr;
3413   oop string = JNIHandles::resolve_non_null(str);
3414   oop result = StringTable::intern(string, CHECK_NULL);
3415   return (jstring) JNIHandles::make_local(THREAD, result);
3416 JVM_END
3417 
3418 
3419 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3420 
3421 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3422 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3423 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3424 // in the safepoint protocol, thread suspension, thread interruption, or most things of that
3425 // nature, except JavaThreads will be blocked by VM_Exit::block_if_vm_exited if the VM has
3426 // shutdown. JavaThreads will be "in native" when using this API from JDK code.
3427 
3428 
3429 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3430   VM_Exit::block_if_vm_exited();
3431   return new PlatformMutex();
3432 }
3433 
3434 
3435 JNIEXPORT void JNICALL  JVM_RawMonitorDestroy(void *mon) {
3436   VM_Exit::block_if_vm_exited();
3437   delete ((PlatformMutex*) mon);
3438 }
3439 
3440 
3441 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3442   VM_Exit::block_if_vm_exited();
3443   ((PlatformMutex*) mon)->lock();
3444   return 0;
3445 }
3446 
3447 
3448 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3449   VM_Exit::block_if_vm_exited();
3450   ((PlatformMutex*) mon)->unlock();
3451 }
3452 
3453 
3454 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3455 
3456 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3457                                     Handle loader, jboolean throwError, TRAPS) {
3458   Klass* klass = SystemDictionary::resolve_or_fail(name, loader, throwError != 0, CHECK_NULL);
3459 
3460   // Check if we should initialize the class
3461   if (init && klass->is_instance_klass()) {
3462     klass->initialize(CHECK_NULL);
3463   }
3464   return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3465 }
3466 
3467 
3468 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3469 
3470 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3471   Handle method_handle;
3472   if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3473     method_handle = Handle(THREAD, JNIHandles::resolve(method));
3474     Handle receiver(THREAD, JNIHandles::resolve(obj));
3475     objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3476     assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3477 
3478     oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3479     jobject res = JNIHandles::make_local(THREAD, result);
3480     if (JvmtiExport::should_post_vm_object_alloc()) {
3481       oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3482       assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3483       if (java_lang_Class::is_primitive(ret_type)) {
3484         // Only for primitive type vm allocates memory for java object.
3485         // See box() method.
3486         JvmtiExport::post_vm_object_alloc(thread, result);
3487       }
3488     }
3489     return res;
3490   } else {
3491     THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3492   }
3493 JVM_END
3494 
3495 
3496 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3497   objArrayHandle args(THREAD, (objArrayOop)JNIHandles::resolve(args0));
3498   assert(args() == nullptr || !args->is_flatArray(), "args are never flat or are they???");
3499   oop constructor_mirror = JNIHandles::resolve(c);

3500   oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3501   jobject res = JNIHandles::make_local(THREAD, result);
3502   if (JvmtiExport::should_post_vm_object_alloc()) {
3503     JvmtiExport::post_vm_object_alloc(thread, result);
3504   }
3505   return res;
3506 JVM_END
3507 
3508 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3509   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3510   HeapShared::initialize_from_archived_subgraph(THREAD, k);
3511 JVM_END
3512 
3513 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3514                                               jclass caller,
3515                                               jstring interfaceMethodName,
3516                                               jobject factoryType,
3517                                               jobject interfaceMethodType,
3518                                               jobject implementationMember,
3519                                               jobject dynamicMethodType,
3520                                               jclass lambdaProxyClass))
3521 #if INCLUDE_CDS
3522   if (!CDSConfig::is_dumping_archive() || !CDSConfig::is_dumping_lambdas_in_legacy_mode()) {
3523     return;
3524   }
3525 
3526   InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3527   if (caller_ik->is_hidden()) {
3528     // Hidden classes not of type lambda proxy classes are currently not being archived.
3529     // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3530     // registered for archiving.
3531     return;
3532   }
3533   InstanceKlass* lambda_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(lambdaProxyClass));
3534   assert(lambda_ik->is_hidden(), "must be a hidden class");
3535   assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3536 
3537   Symbol* interface_method_name = nullptr;
3538   if (interfaceMethodName != nullptr) {
3539     interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3540   }
3541   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3542   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3543 
3544   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3545   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3546 
3547   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3548   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3549   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3550 
3551   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3552   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3553 
3554   LambdaProxyClassDictionary::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3555                                                      interface_method_type, m, dynamic_method_type, THREAD);
3556 #endif // INCLUDE_CDS
3557 JVM_END
3558 
3559 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3560                                                         jclass caller,
3561                                                         jstring interfaceMethodName,
3562                                                         jobject factoryType,
3563                                                         jobject interfaceMethodType,
3564                                                         jobject implementationMember,
3565                                                         jobject dynamicMethodType))
3566 #if INCLUDE_CDS
3567 
3568   if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3569       implementationMember == nullptr || dynamicMethodType == nullptr) {
3570     THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3571   }
3572 
3573   InstanceKlass* caller_ik = java_lang_Class::as_InstanceKlass(JNIHandles::resolve(caller));
3574   if (!caller_ik->in_aot_cache()) {
3575     // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3576     return nullptr;
3577   }
3578 
3579   Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3580   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3581   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3582 
3583   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3584   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3585 
3586   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3587   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3588   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3589 
3590   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3591   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3592 
3593   InstanceKlass* loaded_lambda =
3594     LambdaProxyClassDictionary::load_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3595                                                                interface_method_type, m, dynamic_method_type,
3596                                                                CHECK_(nullptr));
3597   return loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3598 #else
3599   return nullptr;
3600 #endif // INCLUDE_CDS
3601 JVM_END
3602 
3603 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3604   if (CDSConfig::is_dumping_static_archive()) {
3605     // We do this so that the default CDS archive can be deterministic.
3606     const char* release = VM_Version::vm_release();
3607     const char* dbg_level = VM_Version::jdk_debug_level();
3608     const char* version = VM_Version::internal_vm_info_string();
3609     jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3610                          java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3611                          java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3612     seed += (jlong)VM_Version::vm_major_version();
3613     seed += (jlong)VM_Version::vm_minor_version();
3614     seed += (jlong)VM_Version::vm_security_version();
3615     seed += (jlong)VM_Version::vm_patch_version();
3616     if (seed == 0) { // don't let this ever be zero.
3617       seed = 0x87654321;
3618     }
3619     log_debug(aot)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3620     return seed;
3621   } else {
3622     return 0;
3623   }
3624 JVM_END
3625 
3626 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3627   return CDSConfig::get_status();
3628 JVM_END
3629 
3630 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3631 #if INCLUDE_CDS
3632   assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3633   if (line != nullptr) {
3634     ResourceMark rm(THREAD);
3635     Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3636     char* c_line = java_lang_String::as_utf8_string(h_line());
3637     if (CDSConfig::is_dumping_dynamic_archive()) {
3638       // Note: LambdaFormInvokers::append take same format which is not
3639       // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3640       LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3641     }
3642     if (ClassListWriter::is_enabled()) {
3643       ClassListWriter w;
3644       w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3645     }
3646   }
3647 #endif // INCLUDE_CDS
3648 JVM_END
3649 
3650 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3651 #if INCLUDE_CDS
3652   ResourceMark rm(THREAD);
3653   Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3654   char* file_name  = java_lang_String::as_utf8_string(file_handle());
3655   AOTMetaspace::dump_loaded_classes(file_name, THREAD);
3656 #endif // INCLUDE_CDS
3657 JVM_END
3658 
3659 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3660 #if INCLUDE_CDS
3661   ResourceMark rm(THREAD);
3662   Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3663   char* archive_name  = java_lang_String::as_utf8_string(file_handle());
3664   DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3665 #endif // INCLUDE_CDS
3666 JVM_END
3667 
3668 JVM_ENTRY(jboolean, JVM_NeedsClassInitBarrierForCDS(JNIEnv* env, jclass cls))
3669 #if INCLUDE_CDS
3670   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3671   if (!k->is_instance_klass()) {
3672     return false;
3673   } else {
3674     if (InstanceKlass::cast(k)->is_enum_subclass() ||
3675         AOTClassInitializer::can_archive_initialized_mirror(InstanceKlass::cast(k))) {
3676       // This class will be cached in AOT-initialized state. No need for init barriers.
3677       return false;
3678     } else {
3679       // If we cannot cache the class in AOT-initialized state, java.lang.invoke handles
3680       // must emit barriers to ensure class initialization during production run.
3681       ResourceMark rm(THREAD);
3682       log_debug(aot)("NeedsClassInitBarrierForCDS: %s", k->external_name());
3683       return true;
3684     }
3685   }
3686 #else
3687   return false;
3688 #endif // INCLUDE_CDS
3689 JVM_END
3690 
3691 // Returns an array of all live Thread objects (VM internal JavaThreads,
3692 // jvmti agent threads, and JNI attaching threads  are skipped)
3693 // See CR 6404306 regarding JNI attaching threads
3694 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3695   ResourceMark rm(THREAD);
3696   ThreadsListEnumerator tle(THREAD, false, false);
3697   JvmtiVMObjectAllocEventCollector oam;
3698 
3699   int num_threads = tle.num_threads();
3700   objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3701   objArrayHandle threads_ah(THREAD, r);
3702 
3703   for (int i = 0; i < num_threads; i++) {
3704     Handle h = tle.get_threadObj(i);
3705     threads_ah->obj_at_put(i, h());
3706   }
3707 
3708   return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3709 JVM_END
3710 
3711 
3712 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3713 // Return StackTraceElement[][], each element is the stack trace of a thread in
3714 // the corresponding entry in the given threads array
3715 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3716   JvmtiVMObjectAllocEventCollector oam;
3717 
3718   // Check if threads is null
3719   if (threads == nullptr) {
3720     THROW_NULL(vmSymbols::java_lang_NullPointerException());
3721   }
3722 
3723   objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3724   objArrayHandle ah(THREAD, a);
3725   int num_threads = ah->length();
3726   // check if threads is non-empty array
3727   if (num_threads == 0) {
3728     THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3729   }
3730 
3731   // check if threads is not an array of objects of Thread class
3732   Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3733   if (k != vmClasses::Thread_klass()) {
3734     THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3735   }
3736   refArrayHandle rah(THREAD, (refArrayOop)ah()); // j.l.Thread is an identity class, arrays are always reference arrays
3737 
3738   ResourceMark rm(THREAD);
3739 
3740   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3741   for (int i = 0; i < num_threads; i++) {
3742     oop thread_obj = rah->obj_at(i);
3743     instanceHandle h(THREAD, (instanceOop) thread_obj);
3744     thread_handle_array->append(h);
3745   }
3746 
3747   // The JavaThread references in thread_handle_array are validated
3748   // in VM_ThreadDump::doit().
3749   Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3750   return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3751 
3752 JVM_END
3753 
3754 // JVM monitoring and management support
3755 JVM_LEAF(void*, JVM_GetManagement(jint version))
3756   return Management::get_jmm_interface(version);
3757 JVM_END
3758 
3759 // com.sun.tools.attach.VirtualMachine agent properties support
3760 //
3761 // Initialize the agent properties with the properties maintained in the VM
3762 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3763   ResourceMark rm;
3764 
3765   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3766 
3767   PUTPROP(props, "sun.java.command", Arguments::java_command());
3768   PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3769   PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3770   return properties;
3771 JVM_END
3772 
3773 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3774 {
3775   JvmtiVMObjectAllocEventCollector oam;
3776 
3777   if (ofClass == nullptr) {
3778     return nullptr;
3779   }
3780   Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3781   // Special handling for primitive objects
3782   if (java_lang_Class::is_primitive(mirror())) {
3783     return nullptr;
3784   }
3785   Klass* k = java_lang_Class::as_Klass(mirror());
3786   if (!k->is_instance_klass()) {
3787     return nullptr;
3788   }
3789   InstanceKlass* ik = InstanceKlass::cast(k);
3790   int encl_method_class_idx = ik->enclosing_method_class_index();
3791   if (encl_method_class_idx == 0) {
3792     return nullptr;
3793   }
3794   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3795   objArrayHandle dest(THREAD, dest_o);
3796   Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3797   dest->obj_at_put(0, enc_k->java_mirror());
3798   int encl_method_method_idx = ik->enclosing_method_method_index();
3799   if (encl_method_method_idx != 0) {
3800     Symbol* sym = ik->constants()->symbol_at(
3801                         extract_low_short_from_int(
3802                           ik->constants()->name_and_type_at(encl_method_method_idx)));
3803     Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3804     dest->obj_at_put(1, str());
3805     sym = ik->constants()->symbol_at(
3806               extract_high_short_from_int(
3807                 ik->constants()->name_and_type_at(encl_method_method_idx)));
3808     str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3809     dest->obj_at_put(2, str());
3810   }
3811   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3812 }
3813 JVM_END
3814 
3815 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3816 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3817   ResourceMark rm(THREAD);
3818 
3819   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3820     return nullptr;
3821   }
3822 
3823   char** vm_flags = Arguments::jvm_flags_array();
3824   char** vm_args = Arguments::jvm_args_array();
3825   int num_flags = Arguments::num_jvm_flags();
3826   int num_args = Arguments::num_jvm_args();
3827 
3828   InstanceKlass* ik = vmClasses::String_klass();
3829   objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3830   objArrayHandle result_h(THREAD, r);
3831 
3832   int index = 0;
3833   for (int j = 0; j < num_flags; j++, index++) {
3834     Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3835     result_h->obj_at_put(index, h());
3836   }
3837   for (int i = 0; i < num_args; i++, index++) {
3838     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3839     result_h->obj_at_put(index, h());
3840   }
3841   return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3842 JVM_END
3843 
3844 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3845   return os::get_signal_number(name);
3846 JVM_END
3847 
3848 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3849 #if INCLUDE_JVMTI
3850   if (!DoJVMTIVirtualThreadTransitions) {
3851     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3852     return;
3853   }
3854   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3855     JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3856   } else {
3857     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3858     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3859   }
3860 #endif
3861 JVM_END
3862 
3863 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3864 #if INCLUDE_JVMTI
3865   if (!DoJVMTIVirtualThreadTransitions) {
3866     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3867     return;
3868   }
3869   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3870     JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3871   } else {
3872     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3873     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3874   }
3875 #endif
3876 JVM_END
3877 
3878 // If notifications are disabled then just update the VTMS transition bit and return.
3879 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3880 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3881 #if INCLUDE_JVMTI
3882   if (!DoJVMTIVirtualThreadTransitions) {
3883     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3884     return;
3885   }
3886   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3887     JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3888   } else {
3889     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3890     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3891   }
3892 #endif
3893 JVM_END
3894 
3895 // If notifications are disabled then just update the VTMS transition bit and return.
3896 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3897 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3898 #if INCLUDE_JVMTI
3899   if (!DoJVMTIVirtualThreadTransitions) {
3900     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3901     return;
3902   }
3903   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3904     JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3905   } else {
3906     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3907     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3908   }
3909 #endif
3910 JVM_END
3911 
3912 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3913 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3914 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3915 #if INCLUDE_JVMTI
3916   if (!DoJVMTIVirtualThreadTransitions) {
3917     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3918     return;
3919   }
3920   assert(thread->is_disable_suspend() != (bool)enter,
3921          "nested or unbalanced monitor enter/exit is not allowed");
3922   thread->toggle_is_disable_suspend();
3923 #endif
3924 JVM_END
3925 
3926 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3927 #if INCLUDE_JFR
3928   freeze_result result = THREAD->last_freeze_fail_result();
3929   assert(result != freeze_ok, "sanity check");
3930   EventVirtualThreadPinned event(UNTIMED);
3931   event.set_starttime(THREAD->last_freeze_fail_time());
3932   if (event.should_commit()) {
3933     ResourceMark rm(THREAD);
3934     const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3935     THREAD->post_vthread_pinned_event(&event, str, result);
3936   }
3937 #endif
3938 JVM_END
3939 
3940 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3941   ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3942   assert(parkEvent != nullptr, "not initialized");
3943 
3944   OopHandle& list_head = ObjectMonitor::vthread_list_head();
3945   oop vthread_head = nullptr;
3946   while (true) {
3947     if (list_head.peek() != nullptr) {
3948       for (;;) {
3949         oop head = list_head.resolve();
3950         if (list_head.cmpxchg(head, nullptr) == head) {
3951           return JNIHandles::make_local(THREAD, head);
3952         }
3953       }
3954     }
3955     ThreadBlockInVM tbivm(THREAD);
3956     parkEvent->park();
3957   }
3958 JVM_END
3959 /*
3960  * Return the current class's class file version.  The low order 16 bits of the
3961  * returned jint contain the class's major version.  The high order 16 bits
3962  * contain the class's minor version.
3963  */
3964 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
3965   oop mirror = JNIHandles::resolve_non_null(current);
3966   if (java_lang_Class::is_primitive(mirror)) {
3967     // return latest major version and minor version of 0.
3968     return JVM_CLASSFILE_MAJOR_VERSION;
3969   }
3970   InstanceKlass* ik = java_lang_Class::as_InstanceKlass(mirror);
3971   return (ik->minor_version() << 16) | ik->major_version();
3972 JVM_END
3973 
3974 /*
3975  * Ensure that code doing a stackwalk and using javaVFrame::locals() to
3976  * get the value will see a materialized value and not a scalar-replaced
3977  * null value.
3978  */
3979 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
3980   JVM_EnsureMaterializedForStackWalk(env, value);
3981 JVM_END
3982 
3983 /*
3984  * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
3985  */
3986 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
3987   return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
3988 JVM_END
--- EOF ---