1 /*
   2  * Copyright (c) 1997, 2024, 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 "precompiled.hpp"
  26 #include "cds/cdsConfig.hpp"
  27 #include "cds/classListParser.hpp"
  28 #include "cds/classListWriter.hpp"
  29 #include "cds/dynamicArchive.hpp"
  30 #include "cds/heapShared.hpp"
  31 #include "cds/lambdaFormInvokers.hpp"
  32 #include "classfile/classFileStream.hpp"
  33 #include "classfile/classLoader.inline.hpp"
  34 #include "classfile/classLoaderData.hpp"
  35 #include "classfile/classLoaderData.inline.hpp"
  36 #include "classfile/classLoadInfo.hpp"
  37 #include "classfile/javaAssertions.hpp"
  38 #include "classfile/javaClasses.inline.hpp"
  39 #include "classfile/moduleEntry.hpp"
  40 #include "classfile/modules.hpp"
  41 #include "classfile/packageEntry.hpp"
  42 #include "classfile/stringTable.hpp"
  43 #include "classfile/symbolTable.hpp"
  44 #include "classfile/systemDictionary.hpp"
  45 #include "classfile/vmClasses.hpp"
  46 #include "classfile/vmSymbols.hpp"
  47 #include "gc/shared/collectedHeap.inline.hpp"
  48 #include "interpreter/bytecode.hpp"
  49 #include "interpreter/bytecodeUtils.hpp"
  50 #include "jfr/jfrEvents.hpp"
  51 #include "jvm.h"
  52 #include "logging/log.hpp"
  53 #include "memory/oopFactory.hpp"
  54 #include "memory/referenceType.hpp"
  55 #include "memory/resourceArea.hpp"
  56 #include "memory/universe.hpp"
  57 #include "oops/access.inline.hpp"
  58 #include "oops/constantPool.hpp"
  59 #include "oops/fieldStreams.inline.hpp"
  60 #include "oops/instanceKlass.hpp"
  61 #include "oops/klass.inline.hpp"
  62 #include "oops/method.hpp"
  63 #include "oops/recordComponent.hpp"
  64 #include "oops/objArrayKlass.hpp"
  65 #include "oops/objArrayOop.inline.hpp"
  66 #include "oops/oop.inline.hpp"
  67 #include "prims/foreignGlobals.hpp"
  68 #include "prims/jvm_misc.hpp"
  69 #include "prims/jvmtiExport.hpp"
  70 #include "prims/jvmtiThreadState.inline.hpp"
  71 #include "prims/stackwalk.hpp"
  72 #include "runtime/arguments.hpp"
  73 #include "runtime/atomic.hpp"
  74 #include "runtime/continuation.hpp"
  75 #include "runtime/globals_extension.hpp"
  76 #include "runtime/handles.inline.hpp"
  77 #include "runtime/init.hpp"
  78 #include "runtime/interfaceSupport.inline.hpp"
  79 #include "runtime/deoptimization.hpp"
  80 #include "runtime/handshake.hpp"
  81 #include "runtime/java.hpp"
  82 #include "runtime/javaCalls.hpp"
  83 #include "runtime/javaThread.hpp"
  84 #include "runtime/jfieldIDWorkaround.hpp"
  85 #include "runtime/jniHandles.inline.hpp"
  86 #include "runtime/os.inline.hpp"
  87 #include "runtime/osThread.hpp"
  88 #include "runtime/perfData.hpp"
  89 #include "runtime/reflection.hpp"
  90 #include "runtime/synchronizer.hpp"
  91 #include "runtime/threadIdentifier.hpp"
  92 #include "runtime/threadSMR.hpp"
  93 #include "runtime/vframe.inline.hpp"
  94 #include "runtime/vmOperations.hpp"
  95 #include "runtime/vm_version.hpp"
  96 #include "services/attachListener.hpp"
  97 #include "services/management.hpp"
  98 #include "services/threadService.hpp"
  99 #include "utilities/checkedCast.hpp"
 100 #include "utilities/copy.hpp"
 101 #include "utilities/defaultStream.hpp"
 102 #include "utilities/dtrace.hpp"
 103 #include "utilities/events.hpp"
 104 #include "utilities/macros.hpp"
 105 #include "utilities/utf8.hpp"
 106 #include "utilities/zipLibrary.hpp"
 107 #if INCLUDE_CDS
 108 #include "classfile/systemDictionaryShared.hpp"
 109 #endif
 110 #if INCLUDE_JFR
 111 #include "jfr/jfr.hpp"
 112 #endif
 113 #if INCLUDE_MANAGEMENT
 114 #include "services/finalizerService.hpp"
 115 #endif
 116 #ifdef LINUX
 117 #include "osContainer_linux.hpp"
 118 #endif
 119 
 120 #include <errno.h>
 121 
 122 /*
 123   NOTE about use of any ctor or function call that can trigger a safepoint/GC:
 124   such ctors and calls MUST NOT come between an oop declaration/init and its
 125   usage because if objects are move this may cause various memory stomps, bus
 126   errors and segfaults. Here is a cookbook for causing so called "naked oop
 127   failures":
 128 
 129       JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
 130           // Object address to be held directly in mirror & not visible to GC
 131           oop mirror = JNIHandles::resolve_non_null(ofClass);
 132 
 133           // If this ctor can hit a safepoint, moving objects around, then
 134           ComplexConstructor foo;
 135 
 136           // Boom! mirror may point to JUNK instead of the intended object
 137           (some dereference of mirror)
 138 
 139           // Here's another call that may block for GC, making mirror stale
 140           MutexLocker ml(some_lock);
 141 
 142           // And here's an initializer that can result in a stale oop
 143           // all in one step.
 144           oop o = call_that_can_throw_exception(TRAPS);
 145 
 146 
 147   The solution is to keep the oop declaration BELOW the ctor or function
 148   call that might cause a GC, do another resolve to reassign the oop, or
 149   consider use of a Handle instead of an oop so there is immunity from object
 150   motion. But note that the "QUICK" entries below do not have a handlemark
 151   and thus can only support use of handles passed in.
 152 */
 153 
 154 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
 155   ResourceMark rm;
 156   int line_number = -1;
 157   const char * source_file = nullptr;
 158   const char * trace = "explicit";
 159   InstanceKlass* caller = nullptr;
 160   JavaThread* jthread = THREAD;
 161   if (jthread->has_last_Java_frame()) {
 162     vframeStream vfst(jthread);
 163 
 164     // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
 165     TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
 166     Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
 167     TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
 168     Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
 169 
 170     Method* last_caller = nullptr;
 171 
 172     while (!vfst.at_end()) {
 173       Method* m = vfst.method();
 174       if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
 175           !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
 176           !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
 177         break;
 178       }
 179       last_caller = m;
 180       vfst.next();
 181     }
 182     // if this is called from Class.forName0 and that is called from Class.forName,
 183     // then print the caller of Class.forName.  If this is Class.loadClass, then print
 184     // that caller, otherwise keep quiet since this should be picked up elsewhere.
 185     bool found_it = false;
 186     if (!vfst.at_end() &&
 187         vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 188         vfst.method()->name() == vmSymbols::forName0_name()) {
 189       vfst.next();
 190       if (!vfst.at_end() &&
 191           vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 192           vfst.method()->name() == vmSymbols::forName_name()) {
 193         vfst.next();
 194         found_it = true;
 195       }
 196     } else if (last_caller != nullptr &&
 197                last_caller->method_holder()->name() ==
 198                  vmSymbols::java_lang_ClassLoader() &&
 199                last_caller->name() == vmSymbols::loadClass_name()) {
 200       found_it = true;
 201     } else if (!vfst.at_end()) {
 202       if (vfst.method()->is_native()) {
 203         // JNI call
 204         found_it = true;
 205       }
 206     }
 207     if (found_it && !vfst.at_end()) {
 208       // found the caller
 209       caller = vfst.method()->method_holder();
 210       line_number = vfst.method()->line_number_from_bci(vfst.bci());
 211       if (line_number == -1) {
 212         // show method name if it's a native method
 213         trace = vfst.method()->name_and_sig_as_C_string();
 214       }
 215       Symbol* s = caller->source_file_name();
 216       if (s != nullptr) {
 217         source_file = s->as_C_string();
 218       }
 219     }
 220   }
 221   if (caller != nullptr) {
 222     if (to_class != caller) {
 223       const char * from = caller->external_name();
 224       const char * to = to_class->external_name();
 225       // print in a single call to reduce interleaving between threads
 226       if (source_file != nullptr) {
 227         log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
 228       } else {
 229         log_debug(class, resolve)("%s %s (%s)", from, to, trace);
 230       }
 231     }
 232   }
 233 }
 234 
 235 void trace_class_resolution(Klass* to_class) {
 236   EXCEPTION_MARK;
 237   trace_class_resolution_impl(to_class, THREAD);
 238   if (HAS_PENDING_EXCEPTION) {
 239     CLEAR_PENDING_EXCEPTION;
 240   }
 241 }
 242 
 243 // java.lang.System //////////////////////////////////////////////////////////////////////
 244 
 245 
 246 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
 247   return os::javaTimeMillis();
 248 JVM_END
 249 
 250 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
 251   return os::javaTimeNanos();
 252 JVM_END
 253 
 254 // The function below is actually exposed by jdk.internal.misc.VM and not
 255 // java.lang.System, but we choose to keep it here so that it stays next
 256 // to JVM_CurrentTimeMillis and JVM_NanoTime
 257 
 258 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); //  2^32
 259 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
 260 
 261 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
 262   jlong seconds;
 263   jlong nanos;
 264 
 265   os::javaTimeSystemUTC(seconds, nanos);
 266 
 267   // We're going to verify that the result can fit in a long.
 268   // For that we need the difference in seconds between 'seconds'
 269   // and 'offset_secs' to be such that:
 270   //     |seconds - offset_secs| < (2^63/10^9)
 271   // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
 272   // which makes |seconds - offset_secs| < 2^33
 273   // and we will prefer +/- 2^32 as the maximum acceptable diff
 274   // as 2^32 has a more natural feel than 2^33...
 275   //
 276   // So if |seconds - offset_secs| >= 2^32 - we return a special
 277   // sentinel value (-1) which the caller should take as an
 278   // exception value indicating that the offset given to us is
 279   // too far from range of the current time - leading to too big
 280   // a nano adjustment. The caller is expected to recover by
 281   // computing a more accurate offset and calling this method
 282   // again. (For the record 2^32 secs is ~136 years, so that
 283   // should rarely happen)
 284   //
 285   jlong diff = seconds - offset_secs;
 286   if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
 287      return -1; // sentinel value: the offset is too far off the target
 288   }
 289 
 290   // return the adjustment. If you compute a time by adding
 291   // this number of nanoseconds along with the number of seconds
 292   // in the offset you should get the current UTC time.
 293   return (diff * (jlong)1000000000) + nanos;
 294 JVM_END
 295 
 296 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
 297                                jobject dst, jint dst_pos, jint length))
 298   // Check if we have null pointers
 299   if (src == nullptr || dst == nullptr) {
 300     THROW(vmSymbols::java_lang_NullPointerException());
 301   }
 302   arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
 303   arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
 304   assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
 305   assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
 306   // Do copy
 307   s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
 308 JVM_END
 309 
 310 
 311 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
 312   JavaValue r(T_OBJECT);
 313   // public synchronized Object put(Object key, Object value);
 314   HandleMark hm(THREAD);
 315   Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK);
 316   Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK);
 317   JavaCalls::call_virtual(&r,
 318                           props,
 319                           vmClasses::Properties_klass(),
 320                           vmSymbols::put_name(),
 321                           vmSymbols::object_object_object_signature(),
 322                           key_str,
 323                           value_str,
 324                           THREAD);
 325 }
 326 
 327 
 328 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
 329 
 330 /*
 331  * Return all of the system properties in a Java String array with alternating
 332  * names and values from the jvm SystemProperty.
 333  * Which includes some internal and all commandline -D defined properties.
 334  */
 335 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
 336   ResourceMark rm(THREAD);
 337   HandleMark hm(THREAD);
 338   int ndx = 0;
 339   int fixedCount = 2;
 340 
 341   SystemProperty* p = Arguments::system_properties();
 342   int count = Arguments::PropertyList_count(p);
 343 
 344   // Allocate result String array
 345   InstanceKlass* ik = vmClasses::String_klass();
 346   objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
 347   objArrayHandle result_h(THREAD, r);
 348 
 349   while (p != nullptr) {
 350     const char * key = p->key();
 351     if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
 352         const char * value = p->value();
 353         Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
 354         Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != nullptr ? value : ""), CHECK_NULL);
 355         result_h->obj_at_put(ndx * 2,  key_str());
 356         result_h->obj_at_put(ndx * 2 + 1, value_str());
 357         ndx++;
 358     }
 359     p = p->next();
 360   }
 361 
 362   // Convert the -XX:MaxDirectMemorySize= command line flag
 363   // to the sun.nio.MaxDirectMemorySize property.
 364   // Do this after setting user properties to prevent people
 365   // from setting the value with a -D option, as requested.
 366   // Leave empty if not supplied
 367   if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
 368     char as_chars[256];
 369     jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
 370     Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
 371     Handle value_str  = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
 372     result_h->obj_at_put(ndx * 2,  key_str());
 373     result_h->obj_at_put(ndx * 2 + 1, value_str());
 374     ndx++;
 375   }
 376 
 377   // JVM monitoring and management support
 378   // Add the sun.management.compiler property for the compiler's name
 379   {
 380 #undef CSIZE
 381 #if defined(_LP64) || defined(_WIN64)
 382   #define CSIZE "64-Bit "
 383 #else
 384   #define CSIZE
 385 #endif // 64bit
 386 
 387 #if COMPILER1_AND_COMPILER2
 388     const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
 389 #else
 390 #if defined(COMPILER1)
 391     const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
 392 #elif defined(COMPILER2)
 393     const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
 394 #elif INCLUDE_JVMCI
 395     #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
 396 #else
 397     const char* compiler_name = "";
 398 #endif // compilers
 399 #endif // COMPILER1_AND_COMPILER2
 400 
 401     if (*compiler_name != '\0' &&
 402         (Arguments::mode() != Arguments::_int)) {
 403       Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
 404       Handle value_str  = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
 405       result_h->obj_at_put(ndx * 2,  key_str());
 406       result_h->obj_at_put(ndx * 2 + 1, value_str());
 407       ndx++;
 408     }
 409   }
 410 
 411   return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
 412 JVM_END
 413 
 414 
 415 /*
 416  * Return the temporary directory that the VM uses for the attach
 417  * and perf data files.
 418  *
 419  * It is important that this directory is well-known and the
 420  * same for all VM instances. It cannot be affected by configuration
 421  * variables such as java.io.tmpdir.
 422  */
 423 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
 424   HandleMark hm(THREAD);
 425   const char* temp_dir = os::get_temp_directory();
 426   Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
 427   return (jstring) JNIHandles::make_local(THREAD, h());
 428 JVM_END
 429 
 430 
 431 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
 432 
 433 extern volatile jint vm_created;
 434 
 435 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
 436   EventShutdown event;
 437   if (event.should_commit()) {
 438     event.set_reason("Shutdown requested from Java");
 439     event.commit();
 440   }
 441 JVM_END
 442 
 443 
 444 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
 445   before_exit(thread, true);
 446   vm_exit(code);
 447 JVM_END
 448 
 449 
 450 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
 451   if (!DisableExplicitGC) {
 452     EventSystemGC event;
 453     event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
 454     Universe::heap()->collect(GCCause::_java_lang_system_gc);
 455     event.commit();
 456   }
 457 JVM_END
 458 
 459 
 460 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
 461   return Universe::heap()->millis_since_last_whole_heap_examined();
 462 JVM_END
 463 
 464 
 465 static inline jlong convert_size_t_to_jlong(size_t val) {
 466   // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
 467   NOT_LP64 (return (jlong)val;)
 468   LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
 469 }
 470 
 471 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
 472   size_t n = Universe::heap()->capacity();
 473   return convert_size_t_to_jlong(n);
 474 JVM_END
 475 
 476 
 477 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
 478   size_t n = Universe::heap()->unused();
 479   return convert_size_t_to_jlong(n);
 480 JVM_END
 481 
 482 
 483 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
 484   size_t n = Universe::heap()->max_capacity();
 485   return convert_size_t_to_jlong(n);
 486 JVM_END
 487 
 488 
 489 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
 490   return os::active_processor_count();
 491 JVM_END
 492 
 493 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
 494 #ifdef LINUX
 495   if (UseContainerSupport) {
 496     return JNI_TRUE;
 497   }
 498 #endif
 499   return JNI_FALSE;
 500 JVM_END
 501 
 502 JVM_LEAF(jboolean, JVM_IsContainerized(void))
 503 #ifdef LINUX
 504   if (OSContainer::is_containerized()) {
 505     return JNI_TRUE;
 506   }
 507 #endif
 508   return JNI_FALSE;
 509 JVM_END
 510 
 511 // java.lang.Throwable //////////////////////////////////////////////////////
 512 
 513 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
 514   Handle exception(thread, JNIHandles::resolve_non_null(receiver));
 515   java_lang_Throwable::fill_in_stack_trace(exception);
 516 JVM_END
 517 
 518 // java.lang.NullPointerException ///////////////////////////////////////////
 519 
 520 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
 521   if (!ShowCodeDetailsInExceptionMessages) return nullptr;
 522 
 523   oop exc = JNIHandles::resolve_non_null(throwable);
 524 
 525   Method* method;
 526   int bci;
 527   if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
 528     return nullptr;
 529   }
 530   if (method->is_native()) {
 531     return nullptr;
 532   }
 533 
 534   stringStream ss;
 535   bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
 536   if (ok) {
 537     oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
 538     return (jstring) JNIHandles::make_local(THREAD, result);
 539   } else {
 540     return nullptr;
 541   }
 542 JVM_END
 543 
 544 // java.lang.StackTraceElement //////////////////////////////////////////////
 545 
 546 
 547 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
 548   Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
 549   objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
 550   objArrayHandle stack_trace(THREAD, st);
 551   // Fill in the allocated stack trace
 552   java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
 553 JVM_END
 554 
 555 
 556 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
 557   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
 558   Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
 559   java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, CHECK);
 560 JVM_END
 561 
 562 
 563 // java.lang.StackWalker //////////////////////////////////////////////////////
 564 JVM_ENTRY(void, JVM_ExpandStackFrameInfo(JNIEnv *env, jobject obj))
 565   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(obj));
 566 
 567   bool have_name = (java_lang_StackFrameInfo::name(stack_frame_info()) != nullptr);
 568   bool have_type = (java_lang_StackFrameInfo::type(stack_frame_info()) != nullptr);
 569   Method* method = java_lang_StackFrameInfo::get_method(stack_frame_info());
 570   if (!have_name) {
 571     oop name = StringTable::intern(method->name(), CHECK);
 572     java_lang_StackFrameInfo::set_name(stack_frame_info(), name);
 573   }
 574   if (!have_type) {
 575     Handle type = java_lang_String::create_from_symbol(method->signature(), CHECK);
 576     java_lang_StackFrameInfo::set_type(stack_frame_info(), type());
 577   }
 578 JVM_END
 579 
 580 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jint mode,
 581                                      jint skip_frames, jobject contScope, jobject cont,
 582                                      jint buffer_size, jint start_index, jobjectArray frames))
 583   if (!thread->has_last_Java_frame()) {
 584     THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", nullptr);
 585   }
 586 
 587   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 588   Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
 589   Handle cont_h(THREAD, JNIHandles::resolve(cont));
 590   // frames array is a ClassFrameInfo[] array when only getting caller reference,
 591   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 592   // be null.
 593   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 594   objArrayHandle frames_array_h(THREAD, fa);
 595 
 596   if (frames_array_h->length() < buffer_size) {
 597     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", nullptr);
 598   }
 599 
 600   oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
 601                                buffer_size, start_index, frames_array_h, CHECK_NULL);
 602   return JNIHandles::make_local(THREAD, result);
 603 JVM_END
 604 
 605 
 606 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jint mode, jlong anchor,
 607                                   jint last_batch_count, jint buffer_size, jint start_index,
 608                                   jobjectArray frames))
 609   // frames array is a ClassFrameInfo[] array when only getting caller reference,
 610   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 611   // be null.
 612   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 613   objArrayHandle frames_array_h(THREAD, fa);
 614 
 615   if (frames_array_h->length() < buffer_size) {
 616     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
 617   }
 618 
 619   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 620   return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, last_batch_count, buffer_size,
 621                                   start_index, frames_array_h, THREAD);
 622 JVM_END
 623 
 624 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
 625   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 626   objArrayHandle frames_array_h(THREAD, fa);
 627   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 628   Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
 629 
 630   StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
 631 JVM_END
 632 
 633 // java.lang.Object ///////////////////////////////////////////////
 634 
 635 
 636 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
 637   // as implemented in the classic virtual machine; return 0 if object is null
 638   return handle == nullptr ? 0 :
 639          checked_cast<jint>(ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)));
 640 JVM_END
 641 
 642 
 643 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
 644   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 645   JavaThreadInObjectWaitState jtiows(thread, ms != 0);
 646   if (JvmtiExport::should_post_monitor_wait()) {
 647     JvmtiExport::post_monitor_wait(thread, obj(), ms);
 648 
 649     // The current thread already owns the monitor and it has not yet
 650     // been added to the wait queue so the current thread cannot be
 651     // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
 652     // event handler cannot accidentally consume an unpark() meant for
 653     // the ParkEvent associated with this ObjectMonitor.
 654   }
 655   ObjectSynchronizer::wait(obj, ms, CHECK);
 656 JVM_END
 657 
 658 
 659 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
 660   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 661   ObjectSynchronizer::notify(obj, CHECK);
 662 JVM_END
 663 
 664 
 665 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
 666   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 667   ObjectSynchronizer::notifyall(obj, CHECK);
 668 JVM_END
 669 
 670 
 671 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
 672   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 673   Klass* klass = obj->klass();
 674   JvmtiVMObjectAllocEventCollector oam;
 675 
 676 #ifdef ASSERT
 677   // Just checking that the cloneable flag is set correct
 678   if (obj->is_array()) {
 679     guarantee(klass->is_cloneable(), "all arrays are cloneable");
 680   } else {
 681     guarantee(obj->is_instance(), "should be instanceOop");
 682     bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
 683     guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
 684   }
 685 #endif
 686 
 687   // Check if class of obj supports the Cloneable interface.
 688   // All arrays are considered to be cloneable (See JLS 20.1.5).
 689   // All j.l.r.Reference classes are considered non-cloneable.
 690   if (!klass->is_cloneable() ||
 691       (klass->is_instance_klass() &&
 692        InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
 693     ResourceMark rm(THREAD);
 694     THROW_MSG_NULL(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
 695   }
 696 
 697   // Make shallow object copy
 698   const size_t size = obj->size();
 699   oop new_obj_oop = nullptr;
 700   if (obj->is_array()) {
 701     const int length = ((arrayOop)obj())->length();
 702     new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
 703                                                    /* do_zero */ true, CHECK_NULL);
 704   } else {
 705     new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
 706   }
 707 
 708   HeapAccess<>::clone(obj(), new_obj_oop, size);
 709 
 710   Handle new_obj(THREAD, new_obj_oop);
 711   // Caution: this involves a java upcall, so the clone should be
 712   // "gc-robust" by this stage.
 713   if (klass->has_finalizer()) {
 714     assert(obj->is_instance(), "should be instanceOop");
 715     new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
 716     new_obj = Handle(THREAD, new_obj_oop);
 717   }
 718 
 719   return JNIHandles::make_local(THREAD, new_obj());
 720 JVM_END
 721 
 722 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
 723 
 724 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
 725   MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
 726 JVM_END
 727 
 728 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
 729   return InstanceKlass::is_finalization_enabled();
 730 JVM_END
 731 
 732 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
 733 
 734 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
 735   CONT_RegisterNativeMethods(env, cls);
 736 JVM_END
 737 
 738 // java.io.File ///////////////////////////////////////////////////////////////
 739 
 740 JVM_LEAF(char*, JVM_NativePath(char* path))
 741   return os::native_path(path);
 742 JVM_END
 743 
 744 
 745 // Misc. class handling ///////////////////////////////////////////////////////////
 746 
 747 
 748 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
 749   // Getting the class of the caller frame.
 750   //
 751   // The call stack at this point looks something like this:
 752   //
 753   // [0] [ @CallerSensitive public jdk.internal.reflect.Reflection.getCallerClass ]
 754   // [1] [ @CallerSensitive API.method                                   ]
 755   // [.] [ (skipped intermediate frames)                                 ]
 756   // [n] [ caller                                                        ]
 757   vframeStream vfst(thread);
 758   // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
 759   for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
 760     Method* m = vfst.method();
 761     assert(m != nullptr, "sanity");
 762     switch (n) {
 763     case 0:
 764       // This must only be called from Reflection.getCallerClass
 765       if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
 766         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
 767       }
 768       // fall-through
 769     case 1:
 770       // Frame 0 and 1 must be caller sensitive.
 771       if (!m->caller_sensitive()) {
 772         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
 773       }
 774       break;
 775     default:
 776       if (!m->is_ignored_by_security_stack_walk()) {
 777         // We have reached the desired frame; return the holder class.
 778         return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
 779       }
 780       break;
 781     }
 782   }
 783   return nullptr;
 784 JVM_END
 785 
 786 
 787 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
 788   oop mirror = nullptr;
 789   BasicType t = name2type(utf);
 790   if (t != T_ILLEGAL && !is_reference_type(t)) {
 791     mirror = Universe::java_mirror(t);
 792   }
 793   if (mirror == nullptr) {
 794     THROW_MSG_NULL(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
 795   } else {
 796     return (jclass) JNIHandles::make_local(THREAD, mirror);
 797   }
 798 JVM_END
 799 
 800 
 801 // Returns a class loaded by the bootstrap class loader; or null
 802 // if not found.  ClassNotFoundException is not thrown.
 803 // FindClassFromBootLoader is exported to the launcher for windows.
 804 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
 805                                               const char* name))
 806   // Java libraries should ensure that name is never null or illegal.
 807   if (name == nullptr || (int)strlen(name) > Symbol::max_length()) {
 808     // It's impossible to create this class;  the name cannot fit
 809     // into the constant pool.
 810     return nullptr;
 811   }
 812   assert(UTF8::is_legal_utf8((const unsigned char*)name, strlen(name), false), "illegal UTF name");
 813 
 814   TempNewSymbol h_name = SymbolTable::new_symbol(name);
 815   Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
 816   if (k == nullptr) {
 817     return nullptr;
 818   }
 819 
 820   if (log_is_enabled(Debug, class, resolve)) {
 821     trace_class_resolution(k);
 822   }
 823   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
 824 JVM_END
 825 
 826 // Find a class with this name in this loader, using the caller's protection domain.
 827 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
 828                                           jboolean init, jobject loader,
 829                                           jclass caller))
 830   TempNewSymbol h_name =
 831        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
 832                                            CHECK_NULL);
 833 
 834   oop loader_oop = JNIHandles::resolve(loader);
 835   oop from_class = JNIHandles::resolve(caller);
 836   oop protection_domain = nullptr;
 837   // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
 838   // NPE. Put it in another way, the bootstrap class loader has all permission and
 839   // thus no checkPackageAccess equivalence in the VM class loader.
 840   // The caller is also passed as null by the java code if there is no security
 841   // manager to avoid the performance cost of getting the calling class.
 842   if (from_class != nullptr && loader_oop != nullptr) {
 843     protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
 844   }
 845 
 846   Handle h_loader(THREAD, loader_oop);
 847   Handle h_prot(THREAD, protection_domain);
 848   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 849                                                h_prot, false, THREAD);
 850 
 851   if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
 852     trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
 853   }
 854   return result;
 855 JVM_END
 856 
 857 // Currently only called from the old verifier.
 858 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
 859                                          jboolean init, jclass from))
 860   TempNewSymbol h_name =
 861        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
 862                                            CHECK_NULL);
 863   oop from_class_oop = JNIHandles::resolve(from);
 864   Klass* from_class = (from_class_oop == nullptr)
 865                            ? (Klass*)nullptr
 866                            : java_lang_Class::as_Klass(from_class_oop);
 867   oop class_loader = nullptr;
 868   oop protection_domain = nullptr;
 869   if (from_class != nullptr) {
 870     class_loader = from_class->class_loader();
 871     protection_domain = from_class->protection_domain();
 872   }
 873   Handle h_loader(THREAD, class_loader);
 874   Handle h_prot  (THREAD, protection_domain);
 875   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 876                                                h_prot, true, thread);
 877 
 878   if (log_is_enabled(Debug, class, resolve) && result != nullptr) {
 879     // this function is generally only used for class loading during verification.
 880     ResourceMark rm;
 881     oop from_mirror = JNIHandles::resolve_non_null(from);
 882     Klass* from_class = java_lang_Class::as_Klass(from_mirror);
 883     const char * from_name = from_class->external_name();
 884 
 885     oop mirror = JNIHandles::resolve_non_null(result);
 886     Klass* to_class = java_lang_Class::as_Klass(mirror);
 887     const char * to = to_class->external_name();
 888     log_debug(class, resolve)("%s %s (verification)", from_name, to);
 889   }
 890 
 891   return result;
 892 JVM_END
 893 
 894 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
 895 static jclass jvm_define_class_common(const char *name,
 896                                       jobject loader, const jbyte *buf,
 897                                       jsize len, jobject pd, const char *source,
 898                                       TRAPS) {
 899   if (source == nullptr)  source = "__JVM_DefineClass__";
 900 
 901   JavaThread* jt = THREAD;
 902 
 903   PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
 904                              ClassLoader::perf_define_appclass_selftime(),
 905                              ClassLoader::perf_define_appclasses(),
 906                              jt->get_thread_stat()->perf_recursion_counts_addr(),
 907                              jt->get_thread_stat()->perf_timers_addr(),
 908                              PerfClassTraceTime::DEFINE_CLASS);
 909 
 910   if (UsePerfData) {
 911     ClassLoader::perf_app_classfile_bytes_read()->inc(len);
 912   }
 913 
 914   // Class resolution will get the class name from the .class stream if the name is null.
 915   TempNewSymbol class_name = name == nullptr ? nullptr :
 916        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
 917                                            CHECK_NULL);
 918 
 919   ResourceMark rm(THREAD);
 920   ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
 921   Handle class_loader (THREAD, JNIHandles::resolve(loader));
 922   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
 923   ClassLoadInfo cl_info(protection_domain);
 924   Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
 925                                                    class_loader,
 926                                                    cl_info,
 927                                                    CHECK_NULL);
 928 
 929   if (log_is_enabled(Debug, class, resolve)) {
 930     trace_class_resolution(k);
 931   }
 932 
 933   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
 934 }
 935 
 936 enum {
 937   NESTMATE              = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
 938   HIDDEN_CLASS          = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
 939   STRONG_LOADER_LINK    = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
 940   ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
 941 };
 942 
 943 /*
 944  * Define a class with the specified flags that indicates if it's a nestmate,
 945  * hidden, or strongly referenced from class loader.
 946  */
 947 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
 948                                       const jbyte *buf, jsize len, jobject pd,
 949                                       jboolean init, int flags, jobject classData, TRAPS) {
 950   ResourceMark rm(THREAD);
 951 
 952   Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
 953   // Lookup class must be a non-null instance
 954   if (lookup_k == nullptr) {
 955     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
 956   }
 957   assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
 958 
 959   Handle class_loader (THREAD, lookup_k->class_loader());
 960 
 961   bool is_nestmate = (flags & NESTMATE) == NESTMATE;
 962   bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
 963   bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
 964   bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
 965 
 966   InstanceKlass* host_class = nullptr;
 967   if (is_nestmate) {
 968     host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
 969   }
 970 
 971   log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
 972                              name,
 973                              is_nestmate ? "with dynamic nest-host " : "non-nestmate",
 974                              is_nestmate ? host_class->external_name() : "",
 975                              is_hidden ? "hidden" : "not hidden",
 976                              is_strong ? "strong" : "weak",
 977                              vm_annotations ? "with vm annotations" : "without vm annotation");
 978 
 979   if (!is_hidden) {
 980     // classData is only applicable for hidden classes
 981     if (classData != nullptr) {
 982       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
 983     }
 984     if (is_nestmate) {
 985       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
 986     }
 987     if (!is_strong) {
 988       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
 989     }
 990     if (vm_annotations) {
 991       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
 992     }
 993     if (flags != STRONG_LOADER_LINK) {
 994       THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
 995                      err_msg("invalid flag 0x%x", flags));
 996     }
 997   }
 998 
 999   // Class resolution will get the class name from the .class stream if the name is null.
1000   TempNewSymbol class_name = name == nullptr ? nullptr :
1001        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
1002                                            CHECK_NULL);
1003 
1004   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
1005   const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
1006   ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
1007 
1008   InstanceKlass* ik = nullptr;
1009   if (!is_hidden) {
1010     ClassLoadInfo cl_info(protection_domain);
1011     ik = SystemDictionary::resolve_from_stream(&st, class_name,
1012                                                class_loader,
1013                                                cl_info,
1014                                                CHECK_NULL);
1015 
1016     if (log_is_enabled(Debug, class, resolve)) {
1017       trace_class_resolution(ik);
1018     }
1019   } else { // hidden
1020     Handle classData_h(THREAD, JNIHandles::resolve(classData));
1021     ClassLoadInfo cl_info(protection_domain,
1022                           host_class,
1023                           classData_h,
1024                           is_hidden,
1025                           is_strong,
1026                           vm_annotations);
1027     ik = SystemDictionary::resolve_from_stream(&st, class_name,
1028                                                class_loader,
1029                                                cl_info,
1030                                                CHECK_NULL);
1031 
1032     // The hidden class loader data has been artificially been kept alive to
1033     // this point. The mirror and any instances of this class have to keep
1034     // it alive afterwards.
1035     ik->class_loader_data()->dec_keep_alive_ref_count();
1036 
1037     if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1038       ModuleEntry* module = ik->module();
1039       const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1040       log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1041                                   module_name,
1042                                   ik->external_name(),
1043                                   host_class->external_name(),
1044                                   ik->is_hidden() ? "is hidden" : "is not hidden");
1045     }
1046   }
1047 
1048   if ((!is_hidden || is_nestmate) && !Reflection::is_same_class_package(lookup_k, ik)) {
1049     // non-hidden class or nestmate class must be in the same package as the Lookup class
1050     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class and defined class are in different packages");
1051   }
1052 
1053   if (init) {
1054     ik->initialize(CHECK_NULL);
1055   } else {
1056     ik->link_class(CHECK_NULL);
1057   }
1058 
1059   return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1060 }
1061 
1062 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1063   return jvm_define_class_common(name, loader, buf, len, pd, nullptr, THREAD);
1064 JVM_END
1065 
1066 /*
1067  * Define a class with the specified lookup class.
1068  *  lookup:  Lookup class
1069  *  name:    the name of the class
1070  *  buf:     class bytes
1071  *  len:     length of class bytes
1072  *  pd:      protection domain
1073  *  init:    initialize the class
1074  *  flags:   properties of the class
1075  *  classData: private static pre-initialized field
1076  */
1077 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1078           jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1079 
1080   if (lookup == nullptr) {
1081     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1082   }
1083 
1084   assert(buf != nullptr, "buf must not be null");
1085 
1086   return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1087 JVM_END
1088 
1089 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1090 
1091   return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1092 JVM_END
1093 
1094 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1095   ResourceMark rm(THREAD);
1096 
1097   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1098   char* str = java_lang_String::as_utf8_string(h_name());
1099 
1100   // Sanity check, don't expect null
1101   if (str == nullptr) return nullptr;
1102 
1103   // Internalize the string, converting '.' to '/' in string.
1104   char* p = (char*)str;
1105   while (*p != '\0') {
1106     if (*p == '.') {
1107       *p = '/';
1108     }
1109     p++;
1110   }
1111 
1112   const int str_len = (int)(p - str);
1113   if (str_len > Symbol::max_length()) {
1114     // It's impossible to create this class;  the name cannot fit
1115     // into the constant pool.
1116     return nullptr;
1117   }
1118   TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1119 
1120   // Security Note:
1121   //   The Java level wrapper will perform the necessary security check allowing
1122   //   us to pass the null as the initiating class loader.
1123   Handle h_loader(THREAD, JNIHandles::resolve(loader));
1124   Klass* k = SystemDictionary::find_instance_or_array_klass(THREAD, klass_name,
1125                                                             h_loader,
1126                                                             Handle());
1127 #if INCLUDE_CDS
1128   if (k == nullptr) {
1129     // If the class is not already loaded, try to see if it's in the shared
1130     // archive for the current classloader (h_loader).
1131     k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1132   }
1133 #endif
1134   return (k == nullptr) ? nullptr :
1135             (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1136 JVM_END
1137 
1138 // Module support //////////////////////////////////////////////////////////////////////////////
1139 
1140 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1141                                  jstring location, jobjectArray packages))
1142   Handle h_module (THREAD, JNIHandles::resolve(module));
1143   Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1144 JVM_END
1145 
1146 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1147   Handle h_module (THREAD, JNIHandles::resolve(module));
1148   Modules::set_bootloader_unnamed_module(h_module, CHECK);
1149 JVM_END
1150 
1151 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1152   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1153   Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1154   Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1155 JVM_END
1156 
1157 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1158   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1159   Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1160 JVM_END
1161 
1162 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1163   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1164   Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1165 JVM_END
1166 
1167 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1168   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1169   Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1170   Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1171 JVM_END
1172 
1173 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1174   Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1175   Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1176   Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1177 JVM_END
1178 
1179 // Reflection support //////////////////////////////////////////////////////////////////////////////
1180 
1181 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1182   assert (cls != nullptr, "illegal class");
1183   JvmtiVMObjectAllocEventCollector oam;
1184   ResourceMark rm(THREAD);
1185   HandleMark hm(THREAD);
1186   Handle java_class(THREAD, JNIHandles::resolve(cls));
1187   oop result = java_lang_Class::name(java_class, CHECK_NULL);
1188   return (jstring) JNIHandles::make_local(THREAD, result);
1189 JVM_END
1190 
1191 
1192 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1193   JvmtiVMObjectAllocEventCollector oam;
1194   oop mirror = JNIHandles::resolve_non_null(cls);
1195 
1196   // Special handling for primitive objects
1197   if (java_lang_Class::is_primitive(mirror)) {
1198     // Primitive objects does not have any interfaces
1199     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1200     return (jobjectArray) JNIHandles::make_local(THREAD, r);
1201   }
1202 
1203   Klass* klass = java_lang_Class::as_Klass(mirror);
1204   // Figure size of result array
1205   int size;
1206   if (klass->is_instance_klass()) {
1207     size = InstanceKlass::cast(klass)->local_interfaces()->length();
1208   } else {
1209     assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1210     size = 2;
1211   }
1212 
1213   // Allocate result array
1214   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1215   objArrayHandle result (THREAD, r);
1216   // Fill in result
1217   if (klass->is_instance_klass()) {
1218     // Regular instance klass, fill in all local interfaces
1219     for (int index = 0; index < size; index++) {
1220       Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1221       result->obj_at_put(index, k->java_mirror());
1222     }
1223   } else {
1224     // All arrays implement java.lang.Cloneable and java.io.Serializable
1225     result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1226     result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1227   }
1228   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1229 JVM_END
1230 
1231 
1232 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1233   oop mirror = JNIHandles::resolve_non_null(cls);
1234   if (java_lang_Class::is_primitive(mirror)) {
1235     return JNI_FALSE;
1236   }
1237   Klass* k = java_lang_Class::as_Klass(mirror);
1238   jboolean result = k->is_interface();
1239   assert(!result || k->is_instance_klass(),
1240          "all interfaces are instance types");
1241   // The compiler intrinsic for isInterface tests the
1242   // Klass::_access_flags bits in the same way.
1243   return result;
1244 JVM_END
1245 
1246 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1247   oop mirror = JNIHandles::resolve_non_null(cls);
1248   if (java_lang_Class::is_primitive(mirror)) {
1249     return JNI_FALSE;
1250   }
1251   Klass* k = java_lang_Class::as_Klass(mirror);
1252   return k->is_hidden();
1253 JVM_END
1254 
1255 
1256 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1257   oop mirror = JNIHandles::resolve_non_null(cls);
1258   if (mirror == nullptr) {
1259     THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
1260   }
1261 
1262   if (java_lang_Class::is_primitive(mirror)) {
1263     // Primitive types does not have a protection domain.
1264     return nullptr;
1265   }
1266 
1267   oop pd = java_lang_Class::protection_domain(mirror);
1268   return (jobject) JNIHandles::make_local(THREAD, pd);
1269 JVM_END
1270 
1271 
1272 // Returns the inherited_access_control_context field of the running thread.
1273 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1274   oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1275   return JNIHandles::make_local(THREAD, result);
1276 JVM_END
1277 
1278 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1279   if (!UsePrivilegedStack) return nullptr;
1280 
1281   ResourceMark rm(THREAD);
1282   GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1283   JvmtiVMObjectAllocEventCollector oam;
1284 
1285   // count the protection domains on the execution stack. We collapse
1286   // duplicate consecutive protection domains into a single one, as
1287   // well as stopping when we hit a privileged frame.
1288 
1289   oop previous_protection_domain = nullptr;
1290   Handle privileged_context(thread, nullptr);
1291   bool is_privileged = false;
1292   oop protection_domain = nullptr;
1293 
1294   // Iterate through Java frames
1295   vframeStream vfst(thread);
1296   for(; !vfst.at_end(); vfst.next()) {
1297     // get method of frame
1298     Method* method = vfst.method();
1299 
1300     // stop at the first privileged frame
1301     if (method->method_holder() == vmClasses::AccessController_klass() &&
1302       method->name() == vmSymbols::executePrivileged_name())
1303     {
1304       // this frame is privileged
1305       is_privileged = true;
1306 
1307       javaVFrame *priv = vfst.asJavaVFrame();       // executePrivileged
1308 
1309       StackValueCollection* locals = priv->locals();
1310       StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1311       StackValue* clr_sv = locals->at(2); // Class<?> caller
1312       assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1313       assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1314       privileged_context    = ctx_sv->get_obj();
1315       Handle caller         = clr_sv->get_obj();
1316 
1317       Klass *caller_klass = java_lang_Class::as_Klass(caller());
1318       protection_domain  = caller_klass->protection_domain();
1319     } else {
1320       protection_domain = method->method_holder()->protection_domain();
1321     }
1322 
1323     if ((previous_protection_domain != protection_domain) && (protection_domain != nullptr)) {
1324       local_array->push(Handle(thread, protection_domain));
1325       previous_protection_domain = protection_domain;
1326     }
1327 
1328     if (is_privileged) break;
1329   }
1330 
1331 
1332   // either all the domains on the stack were system domains, or
1333   // we had a privileged system domain
1334   if (local_array->is_empty()) {
1335     if (is_privileged && privileged_context.is_null()) return nullptr;
1336 
1337     oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1338     return JNIHandles::make_local(THREAD, result);
1339   }
1340 
1341   objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1342                                                  local_array->length(), CHECK_NULL);
1343   objArrayHandle h_context(thread, context);
1344   for (int index = 0; index < local_array->length(); index++) {
1345     h_context->obj_at_put(index, local_array->at(index)());
1346   }
1347 
1348   oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1349 
1350   return JNIHandles::make_local(THREAD, result);
1351 JVM_END
1352 
1353 class ScopedValueBindingsResolver {
1354 public:
1355   InstanceKlass* Carrier_klass;
1356   ScopedValueBindingsResolver(JavaThread* THREAD) {
1357     Klass *k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ScopedValue_Carrier(), true, THREAD);
1358     Carrier_klass = InstanceKlass::cast(k);
1359   }
1360 };
1361 
1362 JVM_ENTRY(jobject, JVM_FindScopedValueBindings(JNIEnv *env, jclass cls))
1363   ResourceMark rm(THREAD);
1364   GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1365   JvmtiVMObjectAllocEventCollector oam;
1366 
1367   static ScopedValueBindingsResolver resolver(THREAD);
1368 
1369   // Iterate through Java frames
1370   vframeStream vfst(thread);
1371   for(; !vfst.at_end(); vfst.next()) {
1372     int loc = -1;
1373     // get method of frame
1374     Method* method = vfst.method();
1375 
1376     Symbol *name = method->name();
1377 
1378     InstanceKlass* holder = method->method_holder();
1379     if (name == vmSymbols::runWith_method_name()) {
1380       if (holder == vmClasses::Thread_klass()
1381           || holder == resolver.Carrier_klass) {
1382         loc = 1;
1383       }
1384     }
1385 
1386     if (loc != -1) {
1387       javaVFrame *frame = vfst.asJavaVFrame();
1388       StackValueCollection* locals = frame->locals();
1389       StackValue* head_sv = locals->at(loc); // java/lang/ScopedValue$Snapshot
1390       Handle result = head_sv->get_obj();
1391       assert(!head_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1392       if (result() != nullptr) {
1393         return JNIHandles::make_local(THREAD, result());
1394       }
1395     }
1396   }
1397 
1398   return nullptr;
1399 JVM_END
1400 
1401 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1402   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1403   return (k != nullptr) && k->is_array_klass() ? true : false;
1404 JVM_END
1405 
1406 
1407 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1408   oop mirror = JNIHandles::resolve_non_null(cls);
1409   return (jboolean) java_lang_Class::is_primitive(mirror);
1410 JVM_END
1411 
1412 
1413 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1414   oop mirror = JNIHandles::resolve_non_null(cls);
1415   if (java_lang_Class::is_primitive(mirror)) {
1416     // Primitive type
1417     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1418   }
1419 
1420   Klass* k = java_lang_Class::as_Klass(mirror);
1421   debug_only(int computed_modifiers = k->compute_modifier_flags());
1422   assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1423   return k->modifier_flags();
1424 JVM_END
1425 
1426 
1427 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1428 
1429 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1430   JvmtiVMObjectAllocEventCollector oam;
1431   // ofClass is a reference to a java_lang_Class object. The mirror object
1432   // of an InstanceKlass
1433   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1434   if (java_lang_Class::is_primitive(ofMirror) ||
1435       ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1436     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1437     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1438   }
1439 
1440   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1441   InnerClassesIterator iter(k);
1442 
1443   if (iter.length() == 0) {
1444     // Neither an inner nor outer class
1445     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1446     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1447   }
1448 
1449   // find inner class info
1450   constantPoolHandle cp(thread, k->constants());
1451   int length = iter.length();
1452 
1453   // Allocate temp. result array
1454   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1455   objArrayHandle result (THREAD, r);
1456   int members = 0;
1457 
1458   for (; !iter.done(); iter.next()) {
1459     int ioff = iter.inner_class_info_index();
1460     int ooff = iter.outer_class_info_index();
1461 
1462     if (ioff != 0 && ooff != 0) {
1463       // Check to see if the name matches the class we're looking for
1464       // before attempting to find the class.
1465       if (cp->klass_name_at_matches(k, ooff)) {
1466         Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1467         if (outer_klass == k) {
1468            Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1469            InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1470 
1471            // Throws an exception if outer klass has not declared k as
1472            // an inner klass
1473            Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1474 
1475            result->obj_at_put(members, inner_klass->java_mirror());
1476            members++;
1477         }
1478       }
1479     }
1480   }
1481 
1482   if (members != length) {
1483     // Return array of right length
1484     objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1485     for(int i = 0; i < members; i++) {
1486       res->obj_at_put(i, result->obj_at(i));
1487     }
1488     return (jobjectArray)JNIHandles::make_local(THREAD, res);
1489   }
1490 
1491   return (jobjectArray)JNIHandles::make_local(THREAD, result());
1492 JVM_END
1493 
1494 
1495 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1496 {
1497   // ofClass is a reference to a java_lang_Class object.
1498   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1499   if (java_lang_Class::is_primitive(ofMirror)) {
1500     return nullptr;
1501   }
1502   Klass* klass = java_lang_Class::as_Klass(ofMirror);
1503   if (!klass->is_instance_klass()) {
1504     return nullptr;
1505   }
1506 
1507   bool inner_is_member = false;
1508   Klass* outer_klass
1509     = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1510   if (outer_klass == nullptr)  return nullptr;  // already a top-level class
1511   if (!inner_is_member)  return nullptr;     // a hidden class (inside a method)
1512   return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1513 }
1514 JVM_END
1515 
1516 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1517 {
1518   oop mirror = JNIHandles::resolve_non_null(cls);
1519   if (java_lang_Class::is_primitive(mirror)) {
1520     return nullptr;
1521   }
1522   Klass* klass = java_lang_Class::as_Klass(mirror);
1523   if (!klass->is_instance_klass()) {
1524     return nullptr;
1525   }
1526   InstanceKlass* k = InstanceKlass::cast(klass);
1527   int ooff = 0, noff = 0;
1528   if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1529     if (noff != 0) {
1530       constantPoolHandle i_cp(thread, k->constants());
1531       Symbol* name = i_cp->symbol_at(noff);
1532       Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1533       return (jstring) JNIHandles::make_local(THREAD, str());
1534     }
1535   }
1536   return nullptr;
1537 }
1538 JVM_END
1539 
1540 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1541   assert (cls != nullptr, "illegal class");
1542   JvmtiVMObjectAllocEventCollector oam;
1543   ResourceMark rm(THREAD);
1544   oop mirror = JNIHandles::resolve_non_null(cls);
1545   // Return null for arrays and primitives
1546   if (!java_lang_Class::is_primitive(mirror)) {
1547     Klass* k = java_lang_Class::as_Klass(mirror);
1548     if (k->is_instance_klass()) {
1549       Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1550       if (sym == nullptr) return nullptr;
1551       Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1552       return (jstring) JNIHandles::make_local(THREAD, str());
1553     }
1554   }
1555   return nullptr;
1556 JVM_END
1557 
1558 
1559 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1560   assert (cls != nullptr, "illegal class");
1561   oop mirror = JNIHandles::resolve_non_null(cls);
1562   // Return null for arrays and primitives
1563   if (!java_lang_Class::is_primitive(mirror)) {
1564     Klass* k = java_lang_Class::as_Klass(mirror);
1565     if (k->is_instance_klass()) {
1566       typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1567       return (jbyteArray) JNIHandles::make_local(THREAD, a);
1568     }
1569   }
1570   return nullptr;
1571 JVM_END
1572 
1573 
1574 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1575   // some of this code was adapted from from jni_FromReflectedField
1576 
1577   oop reflected = JNIHandles::resolve_non_null(field);
1578   oop mirror    = java_lang_reflect_Field::clazz(reflected);
1579   Klass* k    = java_lang_Class::as_Klass(mirror);
1580   int slot      = java_lang_reflect_Field::slot(reflected);
1581   int modifiers = java_lang_reflect_Field::modifiers(reflected);
1582 
1583   InstanceKlass* ik = InstanceKlass::cast(k);
1584   int offset = ik->field_offset(slot);
1585 
1586   if (modifiers & JVM_ACC_STATIC) {
1587     // for static fields we only look in the current class
1588     if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1589       assert(false, "cannot find static field");
1590       return false;
1591     }
1592   } else {
1593     // for instance fields we start with the current class and work
1594     // our way up through the superclass chain
1595     if (!ik->find_field_from_offset(offset, false, &fd)) {
1596       assert(false, "cannot find instance field");
1597       return false;
1598     }
1599   }
1600   return true;
1601 }
1602 
1603 static Method* jvm_get_method_common(jobject method) {
1604   // some of this code was adapted from from jni_FromReflectedMethod
1605 
1606   oop reflected = JNIHandles::resolve_non_null(method);
1607   oop mirror    = nullptr;
1608   int slot      = 0;
1609 
1610   if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1611     mirror = java_lang_reflect_Constructor::clazz(reflected);
1612     slot   = java_lang_reflect_Constructor::slot(reflected);
1613   } else {
1614     assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1615            "wrong type");
1616     mirror = java_lang_reflect_Method::clazz(reflected);
1617     slot   = java_lang_reflect_Method::slot(reflected);
1618   }
1619   Klass* k = java_lang_Class::as_Klass(mirror);
1620 
1621   Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1622   assert(m != nullptr, "cannot find method");
1623   return m;  // caller has to deal with null in product mode
1624 }
1625 
1626 /* Type use annotations support (JDK 1.8) */
1627 
1628 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1629   assert (cls != nullptr, "illegal class");
1630   ResourceMark rm(THREAD);
1631   // Return null for arrays and primitives
1632   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1633     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1634     if (k->is_instance_klass()) {
1635       AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1636       if (type_annotations != nullptr) {
1637         typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1638         return (jbyteArray) JNIHandles::make_local(THREAD, a);
1639       }
1640     }
1641   }
1642   return nullptr;
1643 JVM_END
1644 
1645 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1646   assert (method != nullptr, "illegal method");
1647   // method is a handle to a java.lang.reflect.Method object
1648   Method* m = jvm_get_method_common(method);
1649   if (m == nullptr) {
1650     return nullptr;
1651   }
1652 
1653   AnnotationArray* type_annotations = m->type_annotations();
1654   if (type_annotations != nullptr) {
1655     typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1656     return (jbyteArray) JNIHandles::make_local(THREAD, a);
1657   }
1658 
1659   return nullptr;
1660 JVM_END
1661 
1662 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1663   assert (field != nullptr, "illegal field");
1664   fieldDescriptor fd;
1665   bool gotFd = jvm_get_field_common(field, fd);
1666   if (!gotFd) {
1667     return nullptr;
1668   }
1669 
1670   return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1671 JVM_END
1672 
1673 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1674   if (!cp->is_within_bounds(index)) {
1675     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1676   }
1677 }
1678 
1679 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1680 {
1681   // method is a handle to a java.lang.reflect.Method object
1682   Method* method_ptr = jvm_get_method_common(method);
1683   methodHandle mh (THREAD, method_ptr);
1684   Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1685   const int num_params = mh->method_parameters_length();
1686 
1687   if (num_params < 0) {
1688     // A -1 return value from method_parameters_length means there is no
1689     // parameter data.  Return null to indicate this to the reflection
1690     // API.
1691     assert(num_params == -1, "num_params should be -1 if it is less than zero");
1692     return (jobjectArray)nullptr;
1693   } else {
1694     // Otherwise, we return something up to reflection, even if it is
1695     // a zero-length array.  Why?  Because in some cases this can
1696     // trigger a MalformedParametersException.
1697 
1698     // make sure all the symbols are properly formatted
1699     for (int i = 0; i < num_params; i++) {
1700       MethodParametersElement* params = mh->method_parameters_start();
1701       int index = params[i].name_cp_index;
1702       constantPoolHandle cp(THREAD, mh->constants());
1703       bounds_check(cp, index, CHECK_NULL);
1704 
1705       if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1706         THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
1707                        "Wrong type at constant pool index");
1708       }
1709 
1710     }
1711 
1712     objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1713     objArrayHandle result (THREAD, result_oop);
1714 
1715     for (int i = 0; i < num_params; i++) {
1716       MethodParametersElement* params = mh->method_parameters_start();
1717       // For a 0 index, give a null symbol
1718       Symbol* sym = 0 != params[i].name_cp_index ?
1719         mh->constants()->symbol_at(params[i].name_cp_index) : nullptr;
1720       int flags = params[i].flags;
1721       oop param = Reflection::new_parameter(reflected_method, i, sym,
1722                                             flags, CHECK_NULL);
1723       result->obj_at_put(i, param);
1724     }
1725     return (jobjectArray)JNIHandles::make_local(THREAD, result());
1726   }
1727 }
1728 JVM_END
1729 
1730 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1731 
1732 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1733 {
1734   JvmtiVMObjectAllocEventCollector oam;
1735 
1736   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1737   // Exclude primitive types and array types
1738   if (java_lang_Class::is_primitive(ofMirror) ||
1739       java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1740     // Return empty array
1741     oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1742     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1743   }
1744 
1745   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1746   constantPoolHandle cp(THREAD, k->constants());
1747 
1748   // Ensure class is linked
1749   k->link_class(CHECK_NULL);
1750 
1751   // Allocate result
1752   int num_fields;
1753 
1754   if (publicOnly) {
1755     num_fields = 0;
1756     for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1757       if (fs.access_flags().is_public()) ++num_fields;
1758     }
1759   } else {
1760     num_fields = k->java_fields_count();
1761   }
1762 
1763   objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1764   objArrayHandle result (THREAD, r);
1765 
1766   int out_idx = 0;
1767   fieldDescriptor fd;
1768   for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1769     if (!publicOnly || fs.access_flags().is_public()) {
1770       fd.reinitialize(k, fs.index());
1771       oop field = Reflection::new_field(&fd, CHECK_NULL);
1772       result->obj_at_put(out_idx, field);
1773       ++out_idx;
1774     }
1775   }
1776   assert(out_idx == num_fields, "just checking");
1777   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1778 }
1779 JVM_END
1780 
1781 // A class is a record if and only if it is final and a direct subclass of
1782 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1783 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1784 {
1785   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1786   if (k != nullptr && k->is_instance_klass()) {
1787     InstanceKlass* ik = InstanceKlass::cast(k);
1788     return ik->is_record();
1789   } else {
1790     return false;
1791   }
1792 }
1793 JVM_END
1794 
1795 // Returns an array containing the components of the Record attribute,
1796 // or null if the attribute is not present.
1797 //
1798 // Note that this function returns the components of the Record attribute
1799 // even if the class is not a record.
1800 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1801 {
1802   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1803   assert(c->is_instance_klass(), "must be");
1804   InstanceKlass* ik = InstanceKlass::cast(c);
1805 
1806   Array<RecordComponent*>* components = ik->record_components();
1807   if (components != nullptr) {
1808     JvmtiVMObjectAllocEventCollector oam;
1809     constantPoolHandle cp(THREAD, ik->constants());
1810     int length = components->length();
1811     assert(length >= 0, "unexpected record_components length");
1812     objArrayOop record_components =
1813       oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1814     objArrayHandle components_h (THREAD, record_components);
1815 
1816     for (int x = 0; x < length; x++) {
1817       RecordComponent* component = components->at(x);
1818       assert(component != nullptr, "unexpected null record component");
1819       oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1820       components_h->obj_at_put(x, component_oop);
1821     }
1822     return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1823   }
1824 
1825   return nullptr;
1826 }
1827 JVM_END
1828 
1829 static jobjectArray get_class_declared_methods_helper(
1830                                   JNIEnv *env,
1831                                   jclass ofClass, jboolean publicOnly,
1832                                   bool want_constructor,
1833                                   Klass* klass, TRAPS) {
1834 
1835   JvmtiVMObjectAllocEventCollector oam;
1836 
1837   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1838   // Exclude primitive types and array types
1839   if (java_lang_Class::is_primitive(ofMirror)
1840       || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1841     // Return empty array
1842     oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1843     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1844   }
1845 
1846   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1847 
1848   // Ensure class is linked
1849   k->link_class(CHECK_NULL);
1850 
1851   Array<Method*>* methods = k->methods();
1852   int methods_length = methods->length();
1853 
1854   // Save original method_idnum in case of redefinition, which can change
1855   // the idnum of obsolete methods.  The new method will have the same idnum
1856   // but if we refresh the methods array, the counts will be wrong.
1857   ResourceMark rm(THREAD);
1858   GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1859   int num_methods = 0;
1860 
1861   // Select methods matching the criteria.
1862   for (int i = 0; i < methods_length; i++) {
1863     Method* method = methods->at(i);
1864     if (want_constructor && !method->is_object_initializer()) {
1865       continue;
1866     }
1867     if (!want_constructor &&
1868         (method->is_object_initializer() || method->is_static_initializer() ||
1869          method->is_overpass())) {
1870       continue;
1871     }
1872     if (publicOnly && !method->is_public()) {
1873       continue;
1874     }
1875     idnums->push(method->method_idnum());
1876     ++num_methods;
1877   }
1878 
1879   // Allocate result
1880   objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1881   objArrayHandle result (THREAD, r);
1882 
1883   // Now just put the methods that we selected above, but go by their idnum
1884   // in case of redefinition.  The methods can be redefined at any safepoint,
1885   // so above when allocating the oop array and below when creating reflect
1886   // objects.
1887   for (int i = 0; i < num_methods; i++) {
1888     methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1889     if (method.is_null()) {
1890       // Method may have been deleted and seems this API can handle null
1891       // Otherwise should probably put a method that throws NSME
1892       result->obj_at_put(i, nullptr);
1893     } else {
1894       oop m;
1895       if (want_constructor) {
1896         m = Reflection::new_constructor(method, CHECK_NULL);
1897       } else {
1898         m = Reflection::new_method(method, false, CHECK_NULL);
1899       }
1900       result->obj_at_put(i, m);
1901     }
1902   }
1903 
1904   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1905 }
1906 
1907 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1908 {
1909   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1910                                            /*want_constructor*/ false,
1911                                            vmClasses::reflect_Method_klass(), THREAD);
1912 }
1913 JVM_END
1914 
1915 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1916 {
1917   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1918                                            /*want_constructor*/ true,
1919                                            vmClasses::reflect_Constructor_klass(), THREAD);
1920 }
1921 JVM_END
1922 
1923 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1924 {
1925   oop mirror = JNIHandles::resolve_non_null(cls);
1926   if (java_lang_Class::is_primitive(mirror)) {
1927     // Primitive type
1928     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1929   }
1930 
1931   Klass* k = java_lang_Class::as_Klass(mirror);
1932   return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1933 }
1934 JVM_END
1935 
1936 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1937 {
1938   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1939   assert(c->is_instance_klass(), "must be");
1940   InstanceKlass* ck = InstanceKlass::cast(c);
1941   Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1942   assert(m->is_instance_klass(), "must be");
1943   InstanceKlass* mk = InstanceKlass::cast(m);
1944   return ck->has_nestmate_access_to(mk, THREAD);
1945 }
1946 JVM_END
1947 
1948 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1949 {
1950   // current is not a primitive or array class
1951   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1952   assert(c->is_instance_klass(), "must be");
1953   InstanceKlass* ck = InstanceKlass::cast(c);
1954   InstanceKlass* host = ck->nest_host(THREAD);
1955   return (jclass) (host == nullptr ? nullptr :
1956                    JNIHandles::make_local(THREAD, host->java_mirror()));
1957 }
1958 JVM_END
1959 
1960 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1961 {
1962   // current is not a primitive or array class
1963   ResourceMark rm(THREAD);
1964   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1965   assert(c->is_instance_klass(), "must be");
1966   InstanceKlass* ck = InstanceKlass::cast(c);
1967   InstanceKlass* host = ck->nest_host(THREAD);
1968 
1969   log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1970                               ck->external_name(), host->external_name());
1971   {
1972     JvmtiVMObjectAllocEventCollector oam;
1973     Array<u2>* members = host->nest_members();
1974     int length = members == nullptr ? 0 : members->length();
1975 
1976     log_trace(class, nestmates)(" - host has %d listed nest members", length);
1977 
1978     // nest host is first in the array so make it one bigger
1979     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1980                                              length + 1, CHECK_NULL);
1981     objArrayHandle result(THREAD, r);
1982     result->obj_at_put(0, host->java_mirror());
1983     if (length != 0) {
1984       int count = 0;
1985       for (int i = 0; i < length; i++) {
1986         int cp_index = members->at(i);
1987         Klass* k = host->constants()->klass_at(cp_index, THREAD);
1988         if (HAS_PENDING_EXCEPTION) {
1989           if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1990             return nullptr; // propagate VMEs
1991           }
1992           if (log_is_enabled(Trace, class, nestmates)) {
1993             stringStream ss;
1994             char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1995             ss.print(" - resolution of nest member %s failed: ", target_member_class);
1996             java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1997             log_trace(class, nestmates)("%s", ss.as_string());
1998           }
1999           CLEAR_PENDING_EXCEPTION;
2000           continue;
2001         }
2002         if (k->is_instance_klass()) {
2003           InstanceKlass* ik = InstanceKlass::cast(k);
2004           InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
2005           if (nest_host_k == host) {
2006             result->obj_at_put(count+1, k->java_mirror());
2007             count++;
2008             log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
2009           } else {
2010             log_trace(class, nestmates)(" - skipping member %s with different host %s",
2011                                         ik->external_name(), nest_host_k->external_name());
2012           }
2013         } else {
2014           log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
2015                                       k->external_name());
2016         }
2017       }
2018       if (count < length) {
2019         // we had invalid entries so we need to compact the array
2020         log_trace(class, nestmates)(" - compacting array from length %d to %d",
2021                                     length + 1, count + 1);
2022 
2023         objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2024                                                   count + 1, CHECK_NULL);
2025         objArrayHandle result2(THREAD, r2);
2026         for (int i = 0; i < count + 1; i++) {
2027           result2->obj_at_put(i, result->obj_at(i));
2028         }
2029         return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2030       }
2031     }
2032     else {
2033       assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2034     }
2035     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2036   }
2037 }
2038 JVM_END
2039 
2040 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2041 {
2042   oop mirror = JNIHandles::resolve_non_null(current);
2043   assert(!java_lang_Class::is_primitive(mirror), "should not be");
2044   Klass* c = java_lang_Class::as_Klass(mirror);
2045   assert(c->is_instance_klass(), "must be");
2046   InstanceKlass* ik = InstanceKlass::cast(c);
2047   ResourceMark rm(THREAD);
2048   log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2049                            ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2050   if (ik->is_sealed()) {
2051     JvmtiVMObjectAllocEventCollector oam;
2052     Array<u2>* subclasses = ik->permitted_subclasses();
2053     int length = subclasses->length();
2054 
2055     log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2056 
2057     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2058                                              length, CHECK_NULL);
2059     objArrayHandle result(THREAD, r);
2060     int count = 0;
2061     for (int i = 0; i < length; i++) {
2062       int cp_index = subclasses->at(i);
2063       Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2064       if (HAS_PENDING_EXCEPTION) {
2065         if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2066           return nullptr; // propagate VMEs
2067         }
2068         if (log_is_enabled(Trace, class, sealed)) {
2069           stringStream ss;
2070           char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2071           ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2072           java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2073           log_trace(class, sealed)("%s", ss.as_string());
2074         }
2075 
2076         CLEAR_PENDING_EXCEPTION;
2077         continue;
2078       }
2079       if (k->is_instance_klass()) {
2080         result->obj_at_put(count++, k->java_mirror());
2081         log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2082       }
2083     }
2084     if (count < length) {
2085       // we had invalid entries so we need to compact the array
2086       objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2087                                                 count, CHECK_NULL);
2088       objArrayHandle result2(THREAD, r2);
2089       for (int i = 0; i < count; i++) {
2090         result2->obj_at_put(i, result->obj_at(i));
2091       }
2092       return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2093     }
2094     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2095   } else {
2096     return nullptr;
2097   }
2098 }
2099 JVM_END
2100 
2101 // Constant pool access //////////////////////////////////////////////////////////
2102 
2103 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2104 {
2105   JvmtiVMObjectAllocEventCollector oam;
2106   oop mirror = JNIHandles::resolve_non_null(cls);
2107   // Return null for primitives and arrays
2108   if (!java_lang_Class::is_primitive(mirror)) {
2109     Klass* k = java_lang_Class::as_Klass(mirror);
2110     if (k->is_instance_klass()) {
2111       InstanceKlass* k_h = InstanceKlass::cast(k);
2112       Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2113       reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2114       return JNIHandles::make_local(THREAD, jcp());
2115     }
2116   }
2117   return nullptr;
2118 }
2119 JVM_END
2120 
2121 
2122 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2123 {
2124   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2125   return cp->length();
2126 }
2127 JVM_END
2128 
2129 
2130 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2131 {
2132   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2133   bounds_check(cp, index, CHECK_NULL);
2134   constantTag tag = cp->tag_at(index);
2135   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2136     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2137   }
2138   Klass* k = cp->klass_at(index, CHECK_NULL);
2139   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2140 }
2141 JVM_END
2142 
2143 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2144 {
2145   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2146   bounds_check(cp, index, CHECK_NULL);
2147   constantTag tag = cp->tag_at(index);
2148   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2149     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2150   }
2151   Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2152   if (k == nullptr) return nullptr;
2153   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2154 }
2155 JVM_END
2156 
2157 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2158   constantTag tag = cp->tag_at(index);
2159   if (!tag.is_method() && !tag.is_interface_method()) {
2160     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2161   }
2162   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2163   Klass* k_o;
2164   if (force_resolution) {
2165     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2166   } else {
2167     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2168     if (k_o == nullptr) return nullptr;
2169   }
2170   InstanceKlass* k = InstanceKlass::cast(k_o);
2171   Symbol* name = cp->uncached_name_ref_at(index);
2172   Symbol* sig  = cp->uncached_signature_ref_at(index);
2173   methodHandle m (THREAD, k->find_method(name, sig));
2174   if (m.is_null()) {
2175     THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2176   }
2177   oop method;
2178   if (m->is_object_initializer()) {
2179     method = Reflection::new_constructor(m, CHECK_NULL);
2180   } else {
2181     // new_method accepts <clinit> as Method here
2182     method = Reflection::new_method(m, true, CHECK_NULL);
2183   }
2184   return JNIHandles::make_local(THREAD, method);
2185 }
2186 
2187 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2188 {
2189   JvmtiVMObjectAllocEventCollector oam;
2190   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2191   bounds_check(cp, index, CHECK_NULL);
2192   jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2193   return res;
2194 }
2195 JVM_END
2196 
2197 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2198 {
2199   JvmtiVMObjectAllocEventCollector oam;
2200   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2201   bounds_check(cp, index, CHECK_NULL);
2202   jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2203   return res;
2204 }
2205 JVM_END
2206 
2207 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2208   constantTag tag = cp->tag_at(index);
2209   if (!tag.is_field()) {
2210     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2211   }
2212   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2213   Klass* k_o;
2214   if (force_resolution) {
2215     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2216   } else {
2217     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2218     if (k_o == nullptr) return nullptr;
2219   }
2220   InstanceKlass* k = InstanceKlass::cast(k_o);
2221   Symbol* name = cp->uncached_name_ref_at(index);
2222   Symbol* sig  = cp->uncached_signature_ref_at(index);
2223   fieldDescriptor fd;
2224   Klass* target_klass = k->find_field(name, sig, &fd);
2225   if (target_klass == nullptr) {
2226     THROW_MSG_NULL(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2227   }
2228   oop field = Reflection::new_field(&fd, CHECK_NULL);
2229   return JNIHandles::make_local(THREAD, field);
2230 }
2231 
2232 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, jint index))
2233 {
2234   JvmtiVMObjectAllocEventCollector oam;
2235   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2236   bounds_check(cp, index, CHECK_NULL);
2237   jobject res = get_field_at_helper(cp, index, true, CHECK_NULL);
2238   return res;
2239 }
2240 JVM_END
2241 
2242 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2243 {
2244   JvmtiVMObjectAllocEventCollector oam;
2245   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2246   bounds_check(cp, index, CHECK_NULL);
2247   jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2248   return res;
2249 }
2250 JVM_END
2251 
2252 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2253 {
2254   JvmtiVMObjectAllocEventCollector oam;
2255   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2256   bounds_check(cp, index, CHECK_NULL);
2257   constantTag tag = cp->tag_at(index);
2258   if (!tag.is_field_or_method()) {
2259     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2260   }
2261   int klass_ref = cp->uncached_klass_ref_index_at(index);
2262   Symbol*  klass_name  = cp->klass_name_at(klass_ref);
2263   Symbol*  member_name = cp->uncached_name_ref_at(index);
2264   Symbol*  member_sig  = cp->uncached_signature_ref_at(index);
2265   objArrayOop  dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2266   objArrayHandle dest(THREAD, dest_o);
2267   Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2268   dest->obj_at_put(0, str());
2269   str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2270   dest->obj_at_put(1, str());
2271   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2272   dest->obj_at_put(2, str());
2273   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2274 }
2275 JVM_END
2276 
2277 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2278 {
2279   JvmtiVMObjectAllocEventCollector oam;
2280   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2281   bounds_check(cp, index, CHECK_0);
2282   constantTag tag = cp->tag_at(index);
2283   if (!tag.is_field_or_method()) {
2284     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2285   }
2286   return (jint) cp->uncached_klass_ref_index_at(index);
2287 }
2288 JVM_END
2289 
2290 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2291 {
2292   JvmtiVMObjectAllocEventCollector oam;
2293   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2294   bounds_check(cp, index, CHECK_0);
2295   constantTag tag = cp->tag_at(index);
2296   if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2297     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2298   }
2299   return (jint) cp->uncached_name_and_type_ref_index_at(index);
2300 }
2301 JVM_END
2302 
2303 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2304 {
2305   JvmtiVMObjectAllocEventCollector oam;
2306   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2307   bounds_check(cp, index, CHECK_NULL);
2308   constantTag tag = cp->tag_at(index);
2309   if (!tag.is_name_and_type()) {
2310     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2311   }
2312   Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2313   Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2314   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2315   objArrayHandle dest(THREAD, dest_o);
2316   Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2317   dest->obj_at_put(0, str());
2318   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2319   dest->obj_at_put(1, str());
2320   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2321 }
2322 JVM_END
2323 
2324 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2325 {
2326   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2327   bounds_check(cp, index, CHECK_0);
2328   constantTag tag = cp->tag_at(index);
2329   if (!tag.is_int()) {
2330     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2331   }
2332   return cp->int_at(index);
2333 }
2334 JVM_END
2335 
2336 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2337 {
2338   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2339   bounds_check(cp, index, CHECK_(0L));
2340   constantTag tag = cp->tag_at(index);
2341   if (!tag.is_long()) {
2342     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2343   }
2344   return cp->long_at(index);
2345 }
2346 JVM_END
2347 
2348 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2349 {
2350   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2351   bounds_check(cp, index, CHECK_(0.0f));
2352   constantTag tag = cp->tag_at(index);
2353   if (!tag.is_float()) {
2354     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2355   }
2356   return cp->float_at(index);
2357 }
2358 JVM_END
2359 
2360 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2361 {
2362   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2363   bounds_check(cp, index, CHECK_(0.0));
2364   constantTag tag = cp->tag_at(index);
2365   if (!tag.is_double()) {
2366     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2367   }
2368   return cp->double_at(index);
2369 }
2370 JVM_END
2371 
2372 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2373 {
2374   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2375   bounds_check(cp, index, CHECK_NULL);
2376   constantTag tag = cp->tag_at(index);
2377   if (!tag.is_string()) {
2378     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2379   }
2380   oop str = cp->string_at(index, CHECK_NULL);
2381   return (jstring) JNIHandles::make_local(THREAD, str);
2382 }
2383 JVM_END
2384 
2385 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2386 {
2387   JvmtiVMObjectAllocEventCollector oam;
2388   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2389   bounds_check(cp, index, CHECK_NULL);
2390   constantTag tag = cp->tag_at(index);
2391   if (!tag.is_symbol()) {
2392     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2393   }
2394   Symbol* sym = cp->symbol_at(index);
2395   Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2396   return (jstring) JNIHandles::make_local(THREAD, str());
2397 }
2398 JVM_END
2399 
2400 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2401 {
2402   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2403   bounds_check(cp, index, CHECK_0);
2404   constantTag tag = cp->tag_at(index);
2405   jbyte result = tag.value();
2406   // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2407   // they are changed to the corresponding tags from the JVM spec, so that java code in
2408   // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2409   if (tag.is_klass_or_reference()) {
2410       result = JVM_CONSTANT_Class;
2411   } else if (tag.is_string_index()) {
2412       result = JVM_CONSTANT_String;
2413   } else if (tag.is_method_type_in_error()) {
2414       result = JVM_CONSTANT_MethodType;
2415   } else if (tag.is_method_handle_in_error()) {
2416       result = JVM_CONSTANT_MethodHandle;
2417   } else if (tag.is_dynamic_constant_in_error()) {
2418       result = JVM_CONSTANT_Dynamic;
2419   }
2420   return result;
2421 }
2422 JVM_END
2423 
2424 // Assertion support. //////////////////////////////////////////////////////////
2425 
2426 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2427   assert(cls != nullptr, "bad class");
2428 
2429   oop r = JNIHandles::resolve(cls);
2430   assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2431   if (java_lang_Class::is_primitive(r)) return false;
2432 
2433   Klass* k = java_lang_Class::as_Klass(r);
2434   assert(k->is_instance_klass(), "must be an instance klass");
2435   if (!k->is_instance_klass()) return false;
2436 
2437   ResourceMark rm(THREAD);
2438   const char* name = k->name()->as_C_string();
2439   bool system_class = k->class_loader() == nullptr;
2440   return JavaAssertions::enabled(name, system_class);
2441 
2442 JVM_END
2443 
2444 
2445 // Return a new AssertionStatusDirectives object with the fields filled in with
2446 // command-line assertion arguments (i.e., -ea, -da).
2447 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2448   JvmtiVMObjectAllocEventCollector oam;
2449   oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2450   return JNIHandles::make_local(THREAD, asd);
2451 JVM_END
2452 
2453 // Verification ////////////////////////////////////////////////////////////////////////////////
2454 
2455 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2456 
2457 // RedefineClasses support: bug 6214132 caused verification to fail.
2458 // All functions from this section should call the jvmtiThreadSate function:
2459 //   Klass* class_to_verify_considering_redefinition(Klass* klass).
2460 // The function returns a Klass* of the _scratch_class if the verifier
2461 // was invoked in the middle of the class redefinition.
2462 // Otherwise it returns its argument value which is the _the_class Klass*.
2463 // Please, refer to the description in the jvmtiThreadSate.hpp.
2464 
2465 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2466   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2467   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2468   return k->name()->as_utf8();
2469 JVM_END
2470 
2471 
2472 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2473   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2474   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2475   // types will have length zero if this is not an InstanceKlass
2476   // (length is determined by call to JVM_GetClassCPEntriesCount)
2477   if (k->is_instance_klass()) {
2478     ConstantPool* cp = InstanceKlass::cast(k)->constants();
2479     for (int index = cp->length() - 1; index >= 0; index--) {
2480       constantTag tag = cp->tag_at(index);
2481       types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2482     }
2483   }
2484 JVM_END
2485 
2486 
2487 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2488   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2489   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2490   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2491 JVM_END
2492 
2493 
2494 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2495   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2496   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2497   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2498 JVM_END
2499 
2500 
2501 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2502   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2503   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2504   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2505 JVM_END
2506 
2507 
2508 // The following methods, used for the verifier, are never called with
2509 // array klasses, so a direct cast to InstanceKlass is safe.
2510 // Typically, these methods are called in a loop with bounds determined
2511 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2512 // zero for arrays.
2513 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2514   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2515   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2516   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2517   int length = method->checked_exceptions_length();
2518   if (length > 0) {
2519     CheckedExceptionElement* table= method->checked_exceptions_start();
2520     for (int i = 0; i < length; i++) {
2521       exceptions[i] = table[i].class_cp_index;
2522     }
2523   }
2524 JVM_END
2525 
2526 
2527 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2528   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2529   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2530   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2531   return method->checked_exceptions_length();
2532 JVM_END
2533 
2534 
2535 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2536   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2537   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2538   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2539   memcpy(code, method->code_base(), method->code_size());
2540 JVM_END
2541 
2542 
2543 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2544   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2545   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2546   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2547   return method->code_size();
2548 JVM_END
2549 
2550 
2551 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2552   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2553   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2554   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2555   ExceptionTable extable(method);
2556   entry->start_pc   = extable.start_pc(entry_index);
2557   entry->end_pc     = extable.end_pc(entry_index);
2558   entry->handler_pc = extable.handler_pc(entry_index);
2559   entry->catchType  = extable.catch_type_index(entry_index);
2560 JVM_END
2561 
2562 
2563 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2564   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2565   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2566   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2567   return method->exception_table_length();
2568 JVM_END
2569 
2570 
2571 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2572   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2573   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2574   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2575   return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2576 JVM_END
2577 
2578 
2579 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2580   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2581   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2582   return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2583 JVM_END
2584 
2585 
2586 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
2587   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2588   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2589   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2590   return method->max_locals();
2591 JVM_END
2592 
2593 
2594 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2595   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2596   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2597   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2598   return method->size_of_parameters();
2599 JVM_END
2600 
2601 
2602 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2603   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2604   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2605   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2606   return method->verifier_max_stack();
2607 JVM_END
2608 
2609 
2610 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2611   ResourceMark rm(THREAD);
2612   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2613   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2614   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2615   return method->name() == vmSymbols::object_initializer_name();
2616 JVM_END
2617 
2618 
2619 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2620   ResourceMark rm(THREAD);
2621   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2622   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2623   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2624   return method->is_overpass();
2625 JVM_END
2626 
2627 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2628   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2629   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2630   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2631   return method->name()->as_utf8();
2632 JVM_END
2633 
2634 
2635 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2636   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2637   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2638   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2639   return method->signature()->as_utf8();
2640 JVM_END
2641 
2642 /**
2643  * All of these JVM_GetCP-xxx methods are used by the old verifier to
2644  * read entries in the constant pool.  Since the old verifier always
2645  * works on a copy of the code, it will not see any rewriting that
2646  * may possibly occur in the middle of verification.  So it is important
2647  * that nothing it calls tries to use the cpCache instead of the raw
2648  * constant pool, so we must use cp->uncached_x methods when appropriate.
2649  */
2650 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2651   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2652   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2653   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2654   switch (cp->tag_at(cp_index).value()) {
2655     case JVM_CONSTANT_Fieldref:
2656       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2657     default:
2658       fatal("JVM_GetCPFieldNameUTF: illegal constant");
2659   }
2660   ShouldNotReachHere();
2661   return nullptr;
2662 JVM_END
2663 
2664 
2665 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2666   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2667   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2668   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2669   switch (cp->tag_at(cp_index).value()) {
2670     case JVM_CONSTANT_InterfaceMethodref:
2671     case JVM_CONSTANT_Methodref:
2672       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2673     default:
2674       fatal("JVM_GetCPMethodNameUTF: illegal constant");
2675   }
2676   ShouldNotReachHere();
2677   return nullptr;
2678 JVM_END
2679 
2680 
2681 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2682   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2683   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2684   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2685   switch (cp->tag_at(cp_index).value()) {
2686     case JVM_CONSTANT_InterfaceMethodref:
2687     case JVM_CONSTANT_Methodref:
2688       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2689     default:
2690       fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2691   }
2692   ShouldNotReachHere();
2693   return nullptr;
2694 JVM_END
2695 
2696 
2697 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2698   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2699   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2700   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2701   switch (cp->tag_at(cp_index).value()) {
2702     case JVM_CONSTANT_Fieldref:
2703       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2704     default:
2705       fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2706   }
2707   ShouldNotReachHere();
2708   return nullptr;
2709 JVM_END
2710 
2711 
2712 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2713   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2714   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2715   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2716   Symbol* classname = cp->klass_name_at(cp_index);
2717   return classname->as_utf8();
2718 JVM_END
2719 
2720 
2721 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2722   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2723   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2724   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2725   switch (cp->tag_at(cp_index).value()) {
2726     case JVM_CONSTANT_Fieldref: {
2727       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2728       Symbol* classname = cp->klass_name_at(class_index);
2729       return classname->as_utf8();
2730     }
2731     default:
2732       fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2733   }
2734   ShouldNotReachHere();
2735   return nullptr;
2736 JVM_END
2737 
2738 
2739 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2740   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2741   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2742   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2743   switch (cp->tag_at(cp_index).value()) {
2744     case JVM_CONSTANT_Methodref:
2745     case JVM_CONSTANT_InterfaceMethodref: {
2746       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2747       Symbol* classname = cp->klass_name_at(class_index);
2748       return classname->as_utf8();
2749     }
2750     default:
2751       fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2752   }
2753   ShouldNotReachHere();
2754   return nullptr;
2755 JVM_END
2756 
2757 
2758 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2759   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2760   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2761   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2762   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2763   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2764   ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2765   switch (cp->tag_at(cp_index).value()) {
2766     case JVM_CONSTANT_Fieldref: {
2767       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2768       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2769       InstanceKlass* ik = InstanceKlass::cast(k_called);
2770       for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2771         if (fs.name() == name && fs.signature() == signature) {
2772           return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2773         }
2774       }
2775       return -1;
2776     }
2777     default:
2778       fatal("JVM_GetCPFieldModifiers: illegal constant");
2779   }
2780   ShouldNotReachHere();
2781   return 0;
2782 JVM_END
2783 
2784 
2785 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2786   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2787   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2788   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2789   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2790   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2791   switch (cp->tag_at(cp_index).value()) {
2792     case JVM_CONSTANT_Methodref:
2793     case JVM_CONSTANT_InterfaceMethodref: {
2794       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2795       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2796       Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2797       int methods_count = methods->length();
2798       for (int i = 0; i < methods_count; i++) {
2799         Method* method = methods->at(i);
2800         if (method->name() == name && method->signature() == signature) {
2801             return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2802         }
2803       }
2804       return -1;
2805     }
2806     default:
2807       fatal("JVM_GetCPMethodModifiers: illegal constant");
2808   }
2809   ShouldNotReachHere();
2810   return 0;
2811 JVM_END
2812 
2813 
2814 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2815 
2816 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2817   // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2818 JVM_END
2819 
2820 
2821 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2822   oop class1_mirror = JNIHandles::resolve_non_null(class1);
2823   oop class2_mirror = JNIHandles::resolve_non_null(class2);
2824   Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2825   Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2826   return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2827 JVM_END
2828 
2829 // Printing support //////////////////////////////////////////////////
2830 extern "C" {
2831 
2832 ATTRIBUTE_PRINTF(3, 0)
2833 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2834   // Reject count values that are negative signed values converted to
2835   // unsigned; see bug 4399518, 4417214
2836   if ((intptr_t)count <= 0) return -1;
2837 
2838   int result = os::vsnprintf(str, count, fmt, args);
2839   if (result > 0 && (size_t)result >= count) {
2840     result = -1;
2841   }
2842 
2843   return result;
2844 }
2845 
2846 ATTRIBUTE_PRINTF(3, 4)
2847 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2848   va_list args;
2849   int len;
2850   va_start(args, fmt);
2851   len = jio_vsnprintf(str, count, fmt, args);
2852   va_end(args);
2853   return len;
2854 }
2855 
2856 ATTRIBUTE_PRINTF(2, 3)
2857 int jio_fprintf(FILE* f, const char *fmt, ...) {
2858   int len;
2859   va_list args;
2860   va_start(args, fmt);
2861   len = jio_vfprintf(f, fmt, args);
2862   va_end(args);
2863   return len;
2864 }
2865 
2866 ATTRIBUTE_PRINTF(2, 0)
2867 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2868   if (Arguments::vfprintf_hook() != nullptr) {
2869      return Arguments::vfprintf_hook()(f, fmt, args);
2870   } else {
2871     return vfprintf(f, fmt, args);
2872   }
2873 }
2874 
2875 ATTRIBUTE_PRINTF(1, 2)
2876 JNIEXPORT int jio_printf(const char *fmt, ...) {
2877   int len;
2878   va_list args;
2879   va_start(args, fmt);
2880   len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2881   va_end(args);
2882   return len;
2883 }
2884 
2885 // HotSpot specific jio method
2886 void jio_print(const char* s, size_t len) {
2887   // Try to make this function as atomic as possible.
2888   if (Arguments::vfprintf_hook() != nullptr) {
2889     jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2890   } else {
2891     // Make an unused local variable to avoid warning from gcc compiler.
2892     bool dummy = os::write(defaultStream::output_fd(), s, len);
2893   }
2894 }
2895 
2896 } // Extern C
2897 
2898 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2899 
2900 // In most of the JVM thread support functions we need to access the
2901 // thread through a ThreadsListHandle to prevent it from exiting and
2902 // being reclaimed while we try to operate on it. The exceptions to this
2903 // rule are when operating on the current thread, or if the monitor of
2904 // the target java.lang.Thread is locked at the Java level - in both
2905 // cases the target cannot exit.
2906 
2907 static void thread_entry(JavaThread* thread, TRAPS) {
2908   HandleMark hm(THREAD);
2909   Handle obj(THREAD, thread->threadObj());
2910   JavaValue result(T_VOID);
2911   JavaCalls::call_virtual(&result,
2912                           obj,
2913                           vmClasses::Thread_klass(),
2914                           vmSymbols::run_method_name(),
2915                           vmSymbols::void_method_signature(),
2916                           THREAD);
2917 }
2918 
2919 
2920 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2921 #if INCLUDE_CDS
2922   if (CDSConfig::is_dumping_static_archive()) {
2923     // During java -Xshare:dump, if we allow multiple Java threads to
2924     // execute in parallel, symbols and classes may be loaded in
2925     // random orders which will make the resulting CDS archive
2926     // non-deterministic.
2927     //
2928     // Lucikly, during java -Xshare:dump, it's important to run only
2929     // the code in the main Java thread (which is NOT started here) that
2930     // creates the module graph, etc. It's safe to not start the other
2931     // threads which are launched by class static initializers
2932     // (ReferenceHandler, FinalizerThread and CleanerImpl).
2933     if (log_is_enabled(Info, cds)) {
2934       ResourceMark rm;
2935       oop t = JNIHandles::resolve_non_null(jthread);
2936       log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2937     }
2938     return;
2939   }
2940 #endif
2941   JavaThread *native_thread = nullptr;
2942 
2943   // We cannot hold the Threads_lock when we throw an exception,
2944   // due to rank ordering issues. Example:  we might need to grab the
2945   // Heap_lock while we construct the exception.
2946   bool throw_illegal_thread_state = false;
2947 
2948   // We must release the Threads_lock before we can post a jvmti event
2949   // in Thread::start.
2950   {
2951     ConditionalMutexLocker throttle_ml(ThreadsLockThrottle_lock, UseThreadsLockThrottleLock);
2952     // Ensure that the C++ Thread and OSThread structures aren't freed before
2953     // we operate.
2954     MutexLocker ml(Threads_lock);
2955 
2956     // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2957     // re-starting an already started thread, so we should usually find
2958     // that the JavaThread is null. However for a JNI attached thread
2959     // there is a small window between the Thread object being created
2960     // (with its JavaThread set) and the update to its threadStatus, so we
2961     // have to check for this
2962     if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != nullptr) {
2963       throw_illegal_thread_state = true;
2964     } else {
2965       jlong size =
2966              java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2967       // Allocate the C++ Thread structure and create the native thread.  The
2968       // stack size retrieved from java is 64-bit signed, but the constructor takes
2969       // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2970       //  - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2971       //  - Avoid passing negative values which would result in really large stacks.
2972       NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2973       size_t sz = size > 0 ? (size_t) size : 0;
2974       native_thread = new JavaThread(&thread_entry, sz);
2975 
2976       // At this point it may be possible that no osthread was created for the
2977       // JavaThread due to lack of memory. Check for this situation and throw
2978       // an exception if necessary. Eventually we may want to change this so
2979       // that we only grab the lock if the thread was created successfully -
2980       // then we can also do this check and throw the exception in the
2981       // JavaThread constructor.
2982       if (native_thread->osthread() != nullptr) {
2983         // Note: the current thread is not being used within "prepare".
2984         native_thread->prepare(jthread);
2985       }
2986     }
2987   }
2988 
2989   if (throw_illegal_thread_state) {
2990     THROW(vmSymbols::java_lang_IllegalThreadStateException());
2991   }
2992 
2993   assert(native_thread != nullptr, "Starting null thread?");
2994 
2995   if (native_thread->osthread() == nullptr) {
2996     ResourceMark rm(thread);
2997     log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2998                             JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2999     // No one should hold a reference to the 'native_thread'.
3000     native_thread->smr_delete();
3001     if (JvmtiExport::should_post_resource_exhausted()) {
3002       JvmtiExport::post_resource_exhausted(
3003         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
3004         os::native_thread_creation_failed_msg());
3005     }
3006     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
3007               os::native_thread_creation_failed_msg());
3008   }
3009 
3010   JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
3011 
3012   Thread::start(native_thread);
3013 
3014 JVM_END
3015 
3016 
3017 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3018   ThreadsListHandle tlh(thread);
3019   oop java_thread = nullptr;
3020   JavaThread* receiver = nullptr;
3021   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3022   java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3023 
3024   if (is_alive) {
3025     // jthread refers to a live JavaThread.
3026     Thread::set_priority(receiver, (ThreadPriority)prio);
3027   }
3028   // Implied else: If the JavaThread hasn't started yet, then the
3029   // priority set in the java.lang.Thread object above will be pushed
3030   // down when it does start.
3031 JVM_END
3032 
3033 
3034 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3035   if (os::dont_yield()) return;
3036   HOTSPOT_THREAD_YIELD();
3037   os::naked_yield();
3038 JVM_END
3039 
3040 JVM_ENTRY(void, JVM_SleepNanos(JNIEnv* env, jclass threadClass, jlong nanos))
3041   if (nanos < 0) {
3042     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nanosecond timeout value out of range");
3043   }
3044 
3045   if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3046     THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3047   }
3048 
3049   // Save current thread state and restore it at the end of this block.
3050   // And set new thread state to SLEEPING.
3051   JavaThreadSleepState jtss(thread);
3052 
3053   HOTSPOT_THREAD_SLEEP_BEGIN(nanos / NANOSECS_PER_MILLISEC);
3054 
3055   if (nanos == 0) {
3056     os::naked_yield();
3057   } else {
3058     ThreadState old_state = thread->osthread()->get_state();
3059     thread->osthread()->set_state(SLEEPING);
3060     if (!thread->sleep_nanos(nanos)) { // interrupted
3061       // An asynchronous exception could have been thrown on
3062       // us while we were sleeping. We do not overwrite those.
3063       if (!HAS_PENDING_EXCEPTION) {
3064         HOTSPOT_THREAD_SLEEP_END(1);
3065 
3066         // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3067         // to properly restore the thread state.  That's likely wrong.
3068         THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3069       }
3070     }
3071     thread->osthread()->set_state(old_state);
3072   }
3073   HOTSPOT_THREAD_SLEEP_END(0);
3074 JVM_END
3075 
3076 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3077   oop jthread = thread->threadObj();
3078   assert(jthread != nullptr, "no current carrier thread!");
3079   return JNIHandles::make_local(THREAD, jthread);
3080 JVM_END
3081 
3082 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3083   oop theThread = thread->vthread();
3084   assert(theThread != (oop)nullptr, "no current thread!");
3085   return JNIHandles::make_local(THREAD, theThread);
3086 JVM_END
3087 
3088 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3089                                      jobject theThread))
3090   oop threadObj = JNIHandles::resolve(theThread);
3091   thread->set_vthread(threadObj);
3092 
3093   // Set lock id of new current Thread
3094   thread->set_lock_id(java_lang_Thread::thread_id(threadObj));
3095 
3096   JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3097 JVM_END
3098 
3099 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3100   return ThreadIdentifier::unsafe_offset();
3101 JVM_END
3102 
3103 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3104   ThreadsListHandle tlh(thread);
3105   JavaThread* receiver = nullptr;
3106   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, nullptr);
3107   if (is_alive) {
3108     // jthread refers to a live JavaThread.
3109     receiver->interrupt();
3110   }
3111 JVM_END
3112 
3113 // Return true iff the current thread has locked the object passed in
3114 
3115 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3116   if (obj == nullptr) {
3117     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3118   }
3119   Handle h_obj(THREAD, JNIHandles::resolve(obj));
3120   return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3121 JVM_END
3122 
3123 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3124   oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3125   return JNIHandles::make_local(THREAD, trace);
3126 JVM_END
3127 
3128 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3129   // We don't use a ThreadsListHandle here because the current thread
3130   // must be alive.
3131   oop java_thread = JNIHandles::resolve_non_null(jthread);
3132   JavaThread* thr = java_lang_Thread::thread(java_thread);
3133   if (thread == thr && !thr->has_attached_via_jni()) {
3134     // Thread naming is only supported for the current thread and
3135     // we don't set the name of an attached thread to avoid stepping
3136     // on other programs.
3137     ResourceMark rm(thread);
3138     const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3139     os::set_native_thread_name(thread_name);
3140   }
3141 JVM_END
3142 
3143 JVM_ENTRY(jobject, JVM_ScopedValueCache(JNIEnv* env, jclass threadClass))
3144   oop theCache = thread->scopedValueCache();
3145   return JNIHandles::make_local(THREAD, theCache);
3146 JVM_END
3147 
3148 JVM_ENTRY(void, JVM_SetScopedValueCache(JNIEnv* env, jclass threadClass,
3149                                        jobject theCache))
3150   arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3151   thread->set_scopedValueCache(objs);
3152 JVM_END
3153 
3154 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3155 
3156 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3157   ResourceMark rm(THREAD);
3158   JvmtiVMObjectAllocEventCollector oam;
3159   vframeStream vfst(thread);
3160 
3161   if (vmClasses::reflect_CallerSensitive_klass() != nullptr) {
3162     // This must only be called from SecurityManager.getClassContext
3163     Method* m = vfst.method();
3164     if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3165           m->name()          == vmSymbols::getClassContext_name() &&
3166           m->signature()     == vmSymbols::void_class_array_signature())) {
3167       THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3168     }
3169   }
3170 
3171   // Collect method holders
3172   GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3173   for (; !vfst.at_end(); vfst.security_next()) {
3174     Method* m = vfst.method();
3175     // Native frames are not returned
3176     if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3177       Klass* holder = m->method_holder();
3178       assert(holder->is_klass(), "just checking");
3179       klass_array->append(holder);
3180     }
3181   }
3182 
3183   // Create result array of type [Ljava/lang/Class;
3184   objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3185   // Fill in mirrors corresponding to method holders
3186   for (int i = 0; i < klass_array->length(); i++) {
3187     result->obj_at_put(i, klass_array->at(i)->java_mirror());
3188   }
3189 
3190   return (jobjectArray) JNIHandles::make_local(THREAD, result);
3191 JVM_END
3192 
3193 
3194 // java.lang.Package ////////////////////////////////////////////////////////////////
3195 
3196 
3197 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3198   ResourceMark rm(THREAD);
3199   JvmtiVMObjectAllocEventCollector oam;
3200   char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3201   oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3202 return (jstring) JNIHandles::make_local(THREAD, result);
3203 JVM_END
3204 
3205 
3206 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3207   JvmtiVMObjectAllocEventCollector oam;
3208   objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3209   return (jobjectArray) JNIHandles::make_local(THREAD, result);
3210 JVM_END
3211 
3212 
3213 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3214 
3215 
3216 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3217   MonitorLocker ml(Heap_lock);
3218   oop ref = Universe::reference_pending_list();
3219   if (ref != nullptr) {
3220     Universe::clear_reference_pending_list();
3221   }
3222   return JNIHandles::make_local(THREAD, ref);
3223 JVM_END
3224 
3225 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3226   MonitorLocker ml(Heap_lock);
3227   return Universe::has_reference_pending_list();
3228 JVM_END
3229 
3230 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3231   MonitorLocker ml(Heap_lock);
3232   while (!Universe::has_reference_pending_list()) {
3233     ml.wait();
3234   }
3235 JVM_END
3236 
3237 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3238   oop ref_oop = JNIHandles::resolve_non_null(ref);
3239   // PhantomReference has it's own implementation of refersTo().
3240   // See: JVM_PhantomReferenceRefersTo
3241   assert(!java_lang_ref_Reference::is_phantom(ref_oop), "precondition");
3242   oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3243   return referent == JNIHandles::resolve(o);
3244 JVM_END
3245 
3246 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3247   oop ref_oop = JNIHandles::resolve_non_null(ref);
3248   // FinalReference has it's own implementation of clear().
3249   assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3250   if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == nullptr) {
3251     // If the referent has already been cleared then done.
3252     // However, if the referent is dead but has not yet been cleared by
3253     // concurrent reference processing, it should NOT be cleared here.
3254     // Instead, clearing should be left to the GC.  Clearing it here could
3255     // detectably lose an expected notification, which is impossible with
3256     // STW reference processing.  The clearing in enqueue() doesn't have
3257     // this problem, since the enqueue covers the notification, but it's not
3258     // worth the effort to handle that case specially.
3259     return;
3260   }
3261   java_lang_ref_Reference::clear_referent(ref_oop);
3262 JVM_END
3263 
3264 
3265 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3266 
3267 
3268 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3269   oop ref_oop = JNIHandles::resolve_non_null(ref);
3270   oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3271   return referent == JNIHandles::resolve(o);
3272 JVM_END
3273 
3274 
3275 // ObjectInputStream ///////////////////////////////////////////////////////////////
3276 
3277 // Return the first user-defined class loader up the execution stack, or null
3278 // if only code from the bootstrap or platform class loader is on the stack.
3279 
3280 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3281   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3282     InstanceKlass* ik = vfst.method()->method_holder();
3283     oop loader = ik->class_loader();
3284     if (loader != nullptr && !SystemDictionary::is_platform_class_loader(loader)) {
3285       return JNIHandles::make_local(THREAD, loader);
3286     }
3287   }
3288   return nullptr;
3289 JVM_END
3290 
3291 
3292 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3293 
3294 
3295 // resolve array handle and check arguments
3296 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3297   if (arr == nullptr) {
3298     THROW_NULL(vmSymbols::java_lang_NullPointerException());
3299   }
3300   oop a = JNIHandles::resolve_non_null(arr);
3301   if (!a->is_array()) {
3302     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3303   } else if (type_array_only && !a->is_typeArray()) {
3304     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3305   }
3306   return arrayOop(a);
3307 }
3308 
3309 
3310 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3311   arrayOop a = check_array(env, arr, false, CHECK_0);
3312   return a->length();
3313 JVM_END
3314 
3315 
3316 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3317   JvmtiVMObjectAllocEventCollector oam;
3318   arrayOop a = check_array(env, arr, false, CHECK_NULL);
3319   jvalue value;
3320   BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3321   oop box = Reflection::box(&value, type, CHECK_NULL);
3322   return JNIHandles::make_local(THREAD, box);
3323 JVM_END
3324 
3325 
3326 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3327   jvalue value;
3328   value.i = 0; // to initialize value before getting used in CHECK
3329   arrayOop a = check_array(env, arr, true, CHECK_(value));
3330   assert(a->is_typeArray(), "just checking");
3331   BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3332   BasicType wide_type = (BasicType) wCode;
3333   if (type != wide_type) {
3334     Reflection::widen(&value, type, wide_type, CHECK_(value));
3335   }
3336   return value;
3337 JVM_END
3338 
3339 
3340 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3341   arrayOop a = check_array(env, arr, false, CHECK);
3342   oop box = JNIHandles::resolve(val);
3343   jvalue value;
3344   value.i = 0; // to initialize value before getting used in CHECK
3345   BasicType value_type;
3346   if (a->is_objArray()) {
3347     // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3348     value_type = Reflection::unbox_for_regular_object(box, &value);
3349   } else {
3350     value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3351   }
3352   Reflection::array_set(&value, a, index, value_type, CHECK);
3353 JVM_END
3354 
3355 
3356 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3357   arrayOop a = check_array(env, arr, true, CHECK);
3358   assert(a->is_typeArray(), "just checking");
3359   BasicType value_type = (BasicType) vCode;
3360   Reflection::array_set(&v, a, index, value_type, CHECK);
3361 JVM_END
3362 
3363 
3364 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3365   JvmtiVMObjectAllocEventCollector oam;
3366   oop element_mirror = JNIHandles::resolve(eltClass);
3367   oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3368   return JNIHandles::make_local(THREAD, result);
3369 JVM_END
3370 
3371 
3372 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3373   JvmtiVMObjectAllocEventCollector oam;
3374   arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3375   oop element_mirror = JNIHandles::resolve(eltClass);
3376   assert(dim_array->is_typeArray(), "just checking");
3377   oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3378   return JNIHandles::make_local(THREAD, result);
3379 JVM_END
3380 
3381 
3382 // Library support ///////////////////////////////////////////////////////////////////////////
3383 
3384 JVM_LEAF(void*, JVM_LoadZipLibrary())
3385   return ZipLibrary::handle();
3386 JVM_END
3387 
3388 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3389   //%note jvm_ct
3390   char ebuf[1024];
3391   void *load_result;
3392   {
3393     ThreadToNativeFromVM ttnfvm(thread);
3394     load_result = os::dll_load(name, ebuf, sizeof ebuf);
3395   }
3396   if (load_result == nullptr) {
3397     if (throwException) {
3398       char msg[1024];
3399       jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3400       // Since 'ebuf' may contain a string encoded using
3401       // platform encoding scheme, we need to pass
3402       // Exceptions::unsafe_to_utf8 to the new_exception method
3403       // as the last argument. See bug 6367357.
3404       Handle h_exception =
3405         Exceptions::new_exception(thread,
3406                                   vmSymbols::java_lang_UnsatisfiedLinkError(),
3407                                   msg, Exceptions::unsafe_to_utf8);
3408 
3409       THROW_HANDLE_NULL(h_exception);
3410     } else {
3411       log_info(library)("Failed to load library %s", name);
3412       return load_result;
3413     }
3414   }
3415   log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3416   return load_result;
3417 JVM_END
3418 
3419 
3420 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3421   os::dll_unload(handle);
3422   log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3423 JVM_END
3424 
3425 
3426 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3427   void* find_result = os::dll_lookup(handle, name);
3428   log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3429                     find_result != nullptr ? "Found" : "Failed to find",
3430                     name, p2i(handle));
3431   return find_result;
3432 JVM_END
3433 
3434 
3435 // JNI version ///////////////////////////////////////////////////////////////////////////////
3436 
3437 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3438   return Threads::is_supported_jni_version_including_1_1(version);
3439 JVM_END
3440 
3441 
3442 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3443   return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3444 JVM_END
3445 
3446 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3447   return VMContinuations ? JNI_TRUE : JNI_FALSE;
3448 JVM_END
3449 
3450 JVM_LEAF(jboolean, JVM_IsForeignLinkerSupported(void))
3451   return ForeignGlobals::is_foreign_linker_supported() ? JNI_TRUE : JNI_FALSE;
3452 JVM_END
3453 
3454 JVM_ENTRY_NO_ENV(jboolean, JVM_IsStaticallyLinked(void))
3455   return is_vm_statically_linked() ? JNI_TRUE : JNI_FALSE;
3456 JVM_END
3457 
3458 // String support ///////////////////////////////////////////////////////////////////////////
3459 
3460 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3461   JvmtiVMObjectAllocEventCollector oam;
3462   if (str == nullptr) return nullptr;
3463   oop string = JNIHandles::resolve_non_null(str);
3464   oop result = StringTable::intern(string, CHECK_NULL);
3465   return (jstring) JNIHandles::make_local(THREAD, result);
3466 JVM_END
3467 
3468 
3469 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3470 
3471 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3472 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3473 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3474 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3475 // nature. JavaThreads will be "in native" when using this API from JDK code.
3476 
3477 
3478 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3479   VM_Exit::block_if_vm_exited();
3480   return new PlatformMutex();
3481 }
3482 
3483 
3484 JNIEXPORT void JNICALL  JVM_RawMonitorDestroy(void *mon) {
3485   VM_Exit::block_if_vm_exited();
3486   delete ((PlatformMutex*) mon);
3487 }
3488 
3489 
3490 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3491   VM_Exit::block_if_vm_exited();
3492   ((PlatformMutex*) mon)->lock();
3493   return 0;
3494 }
3495 
3496 
3497 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3498   VM_Exit::block_if_vm_exited();
3499   ((PlatformMutex*) mon)->unlock();
3500 }
3501 
3502 
3503 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3504 
3505 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3506                                     Handle loader, Handle protection_domain,
3507                                     jboolean throwError, TRAPS) {
3508   // Security Note:
3509   //   The Java level wrapper will perform the necessary security check allowing
3510   //   us to pass the null as the initiating class loader.  The VM is responsible for
3511   //   the checkPackageAccess relative to the initiating class loader via the
3512   //   protection_domain. The protection_domain is passed as null by the java code
3513   //   if there is no security manager in 3-arg Class.forName().
3514   Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3515 
3516   // Check if we should initialize the class
3517   if (init && klass->is_instance_klass()) {
3518     klass->initialize(CHECK_NULL);
3519   }
3520   return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3521 }
3522 
3523 
3524 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3525 
3526 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3527   Handle method_handle;
3528   if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3529     method_handle = Handle(THREAD, JNIHandles::resolve(method));
3530     Handle receiver(THREAD, JNIHandles::resolve(obj));
3531     objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3532     oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3533     jobject res = JNIHandles::make_local(THREAD, result);
3534     if (JvmtiExport::should_post_vm_object_alloc()) {
3535       oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3536       assert(ret_type != nullptr, "sanity check: ret_type oop must not be null!");
3537       if (java_lang_Class::is_primitive(ret_type)) {
3538         // Only for primitive type vm allocates memory for java object.
3539         // See box() method.
3540         JvmtiExport::post_vm_object_alloc(thread, result);
3541       }
3542     }
3543     return res;
3544   } else {
3545     THROW_NULL(vmSymbols::java_lang_StackOverflowError());
3546   }
3547 JVM_END
3548 
3549 
3550 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3551   oop constructor_mirror = JNIHandles::resolve(c);
3552   objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3553   oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3554   jobject res = JNIHandles::make_local(THREAD, result);
3555   if (JvmtiExport::should_post_vm_object_alloc()) {
3556     JvmtiExport::post_vm_object_alloc(thread, result);
3557   }
3558   return res;
3559 JVM_END
3560 
3561 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3562   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3563   assert(k->is_klass(), "just checking");
3564   HeapShared::initialize_from_archived_subgraph(THREAD, k);
3565 JVM_END
3566 
3567 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3568                                               jclass caller,
3569                                               jstring interfaceMethodName,
3570                                               jobject factoryType,
3571                                               jobject interfaceMethodType,
3572                                               jobject implementationMember,
3573                                               jobject dynamicMethodType,
3574                                               jclass lambdaProxyClass))
3575 #if INCLUDE_CDS
3576   if (!CDSConfig::is_dumping_archive()) {
3577     return;
3578   }
3579 
3580   Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3581   InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3582   if (caller_ik->is_hidden()) {
3583     // Hidden classes not of type lambda proxy classes are currently not being archived.
3584     // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3585     // registered for archiving.
3586     return;
3587   }
3588   Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3589   InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3590   assert(lambda_ik->is_hidden(), "must be a hidden class");
3591   assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3592 
3593   Symbol* interface_method_name = nullptr;
3594   if (interfaceMethodName != nullptr) {
3595     interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3596   }
3597   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3598   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3599 
3600   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3601   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3602 
3603   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3604   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3605   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3606 
3607   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3608   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3609 
3610   SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3611                                                  interface_method_type, m, dynamic_method_type, THREAD);
3612 #endif // INCLUDE_CDS
3613 JVM_END
3614 
3615 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3616                                                         jclass caller,
3617                                                         jstring interfaceMethodName,
3618                                                         jobject factoryType,
3619                                                         jobject interfaceMethodType,
3620                                                         jobject implementationMember,
3621                                                         jobject dynamicMethodType))
3622 #if INCLUDE_CDS
3623 
3624   if (interfaceMethodName == nullptr || factoryType == nullptr || interfaceMethodType == nullptr ||
3625       implementationMember == nullptr || dynamicMethodType == nullptr) {
3626     THROW_(vmSymbols::java_lang_NullPointerException(), nullptr);
3627   }
3628 
3629   Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3630   InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3631   if (!caller_ik->is_shared()) {
3632     // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3633     return nullptr;
3634   }
3635 
3636   Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3637   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3638   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3639 
3640   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3641   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3642 
3643   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3644   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3645   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3646 
3647   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3648   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3649 
3650   InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3651                                                                                    interface_method_type, m, dynamic_method_type);
3652   jclass jcls = nullptr;
3653   if (lambda_ik != nullptr) {
3654     InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3655     jcls = loaded_lambda == nullptr ? nullptr : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3656   }
3657   return jcls;
3658 #else
3659   return nullptr;
3660 #endif // INCLUDE_CDS
3661 JVM_END
3662 
3663 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3664   if (CDSConfig::is_dumping_static_archive()) {
3665     // We do this so that the default CDS archive can be deterministic.
3666     const char* release = VM_Version::vm_release();
3667     const char* dbg_level = VM_Version::jdk_debug_level();
3668     const char* version = VM_Version::internal_vm_info_string();
3669     jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3670                          java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3671                          java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3672     seed += (jlong)VM_Version::vm_major_version();
3673     seed += (jlong)VM_Version::vm_minor_version();
3674     seed += (jlong)VM_Version::vm_security_version();
3675     seed += (jlong)VM_Version::vm_patch_version();
3676     if (seed == 0) { // don't let this ever be zero.
3677       seed = 0x87654321;
3678     }
3679     log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3680     return seed;
3681   } else {
3682     return 0;
3683   }
3684 JVM_END
3685 
3686 JVM_ENTRY_NO_ENV(jint, JVM_GetCDSConfigStatus())
3687   return CDSConfig::get_status();
3688 JVM_END
3689 
3690 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3691 #if INCLUDE_CDS
3692   assert(CDSConfig::is_logging_lambda_form_invokers(), "sanity");
3693   if (line != nullptr) {
3694     ResourceMark rm(THREAD);
3695     Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3696     char* c_line = java_lang_String::as_utf8_string(h_line());
3697     if (CDSConfig::is_dumping_dynamic_archive()) {
3698       // Note: LambdaFormInvokers::append take same format which is not
3699       // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3700       LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3701     }
3702     if (ClassListWriter::is_enabled()) {
3703       ClassListWriter w;
3704       w.stream()->print_cr("%s %s", ClassListParser::lambda_form_tag(), c_line);
3705     }
3706   }
3707 #endif // INCLUDE_CDS
3708 JVM_END
3709 
3710 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3711 #if INCLUDE_CDS
3712   ResourceMark rm(THREAD);
3713   Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3714   char* file_name  = java_lang_String::as_utf8_string(file_handle());
3715   MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3716 #endif // INCLUDE_CDS
3717 JVM_END
3718 
3719 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3720 #if INCLUDE_CDS
3721   ResourceMark rm(THREAD);
3722   Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3723   char* archive_name  = java_lang_String::as_utf8_string(file_handle());
3724   DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3725 #endif // INCLUDE_CDS
3726 JVM_END
3727 
3728 // Returns an array of all live Thread objects (VM internal JavaThreads,
3729 // jvmti agent threads, and JNI attaching threads  are skipped)
3730 // See CR 6404306 regarding JNI attaching threads
3731 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3732   ResourceMark rm(THREAD);
3733   ThreadsListEnumerator tle(THREAD, false, false);
3734   JvmtiVMObjectAllocEventCollector oam;
3735 
3736   int num_threads = tle.num_threads();
3737   objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3738   objArrayHandle threads_ah(THREAD, r);
3739 
3740   for (int i = 0; i < num_threads; i++) {
3741     Handle h = tle.get_threadObj(i);
3742     threads_ah->obj_at_put(i, h());
3743   }
3744 
3745   return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3746 JVM_END
3747 
3748 
3749 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3750 // Return StackTraceElement[][], each element is the stack trace of a thread in
3751 // the corresponding entry in the given threads array
3752 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3753   JvmtiVMObjectAllocEventCollector oam;
3754 
3755   // Check if threads is null
3756   if (threads == nullptr) {
3757     THROW_NULL(vmSymbols::java_lang_NullPointerException());
3758   }
3759 
3760   objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3761   objArrayHandle ah(THREAD, a);
3762   int num_threads = ah->length();
3763   // check if threads is non-empty array
3764   if (num_threads == 0) {
3765     THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3766   }
3767 
3768   // check if threads is not an array of objects of Thread class
3769   Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3770   if (k != vmClasses::Thread_klass()) {
3771     THROW_NULL(vmSymbols::java_lang_IllegalArgumentException());
3772   }
3773 
3774   ResourceMark rm(THREAD);
3775 
3776   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3777   for (int i = 0; i < num_threads; i++) {
3778     oop thread_obj = ah->obj_at(i);
3779     instanceHandle h(THREAD, (instanceOop) thread_obj);
3780     thread_handle_array->append(h);
3781   }
3782 
3783   // The JavaThread references in thread_handle_array are validated
3784   // in VM_ThreadDump::doit().
3785   Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3786   return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3787 
3788 JVM_END
3789 
3790 // JVM monitoring and management support
3791 JVM_LEAF(void*, JVM_GetManagement(jint version))
3792   return Management::get_jmm_interface(version);
3793 JVM_END
3794 
3795 // com.sun.tools.attach.VirtualMachine agent properties support
3796 //
3797 // Initialize the agent properties with the properties maintained in the VM
3798 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3799   ResourceMark rm;
3800 
3801   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3802 
3803   PUTPROP(props, "sun.java.command", Arguments::java_command());
3804   PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3805   PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3806   return properties;
3807 JVM_END
3808 
3809 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3810 {
3811   JvmtiVMObjectAllocEventCollector oam;
3812 
3813   if (ofClass == nullptr) {
3814     return nullptr;
3815   }
3816   Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3817   // Special handling for primitive objects
3818   if (java_lang_Class::is_primitive(mirror())) {
3819     return nullptr;
3820   }
3821   Klass* k = java_lang_Class::as_Klass(mirror());
3822   if (!k->is_instance_klass()) {
3823     return nullptr;
3824   }
3825   InstanceKlass* ik = InstanceKlass::cast(k);
3826   int encl_method_class_idx = ik->enclosing_method_class_index();
3827   if (encl_method_class_idx == 0) {
3828     return nullptr;
3829   }
3830   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3831   objArrayHandle dest(THREAD, dest_o);
3832   Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3833   dest->obj_at_put(0, enc_k->java_mirror());
3834   int encl_method_method_idx = ik->enclosing_method_method_index();
3835   if (encl_method_method_idx != 0) {
3836     Symbol* sym = ik->constants()->symbol_at(
3837                         extract_low_short_from_int(
3838                           ik->constants()->name_and_type_at(encl_method_method_idx)));
3839     Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3840     dest->obj_at_put(1, str());
3841     sym = ik->constants()->symbol_at(
3842               extract_high_short_from_int(
3843                 ik->constants()->name_and_type_at(encl_method_method_idx)));
3844     str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3845     dest->obj_at_put(2, str());
3846   }
3847   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3848 }
3849 JVM_END
3850 
3851 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3852 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3853   ResourceMark rm(THREAD);
3854 
3855   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3856     return nullptr;
3857   }
3858 
3859   char** vm_flags = Arguments::jvm_flags_array();
3860   char** vm_args = Arguments::jvm_args_array();
3861   int num_flags = Arguments::num_jvm_flags();
3862   int num_args = Arguments::num_jvm_args();
3863 
3864   InstanceKlass* ik = vmClasses::String_klass();
3865   objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3866   objArrayHandle result_h(THREAD, r);
3867 
3868   int index = 0;
3869   for (int j = 0; j < num_flags; j++, index++) {
3870     Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3871     result_h->obj_at_put(index, h());
3872   }
3873   for (int i = 0; i < num_args; i++, index++) {
3874     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3875     result_h->obj_at_put(index, h());
3876   }
3877   return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3878 JVM_END
3879 
3880 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3881   return os::get_signal_number(name);
3882 JVM_END
3883 
3884 JVM_ENTRY(void, JVM_VirtualThreadStart(JNIEnv* env, jobject vthread))
3885 #if INCLUDE_JVMTI
3886   if (!DoJVMTIVirtualThreadTransitions) {
3887     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3888     return;
3889   }
3890   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3891     JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
3892   } else {
3893     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3894     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, false);
3895   }
3896 #endif
3897 JVM_END
3898 
3899 JVM_ENTRY(void, JVM_VirtualThreadEnd(JNIEnv* env, jobject vthread))
3900 #if INCLUDE_JVMTI
3901   if (!DoJVMTIVirtualThreadTransitions) {
3902     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3903     return;
3904   }
3905   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3906     JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
3907   } else {
3908     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3909     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, true);
3910   }
3911 #endif
3912 JVM_END
3913 
3914 // If notifications are disabled then just update the VTMS transition bit and return.
3915 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call.
3916 JVM_ENTRY(void, JVM_VirtualThreadMount(JNIEnv* env, jobject vthread, jboolean hide))
3917 #if INCLUDE_JVMTI
3918   if (!DoJVMTIVirtualThreadTransitions) {
3919     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3920     return;
3921   }
3922   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3923     JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
3924   } else {
3925     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3926     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3927   }
3928 #endif
3929 JVM_END
3930 
3931 // If notifications are disabled then just update the VTMS transition bit and return.
3932 // Otherwise, the bit is updated in the given jvmtiVTMSTransitionDisabler function call below.
3933 JVM_ENTRY(void, JVM_VirtualThreadUnmount(JNIEnv* env, jobject vthread, jboolean hide))
3934 #if INCLUDE_JVMTI
3935   if (!DoJVMTIVirtualThreadTransitions) {
3936     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3937     return;
3938   }
3939   if (JvmtiVTMSTransitionDisabler::VTMS_notify_jvmti_events()) {
3940     JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
3941   } else {
3942     // set VTMS transition bit value in JavaThread and java.lang.VirtualThread object
3943     JvmtiVTMSTransitionDisabler::set_is_in_VTMS_transition(thread, vthread, hide);
3944   }
3945 #endif
3946 JVM_END
3947 
3948 // Notification from VirtualThread about disabling JVMTI Suspend in a sync critical section.
3949 // Needed to avoid deadlocks with JVMTI suspend mechanism.
3950 JVM_ENTRY(void, JVM_VirtualThreadDisableSuspend(JNIEnv* env, jclass clazz, jboolean enter))
3951 #if INCLUDE_JVMTI
3952   if (!DoJVMTIVirtualThreadTransitions) {
3953     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3954     return;
3955   }
3956   assert(thread->is_disable_suspend() != (bool)enter,
3957          "nested or unbalanced monitor enter/exit is not allowed");
3958   thread->toggle_is_disable_suspend();
3959 #endif
3960 JVM_END
3961 
3962 JVM_ENTRY(void, JVM_VirtualThreadPinnedEvent(JNIEnv* env, jclass ignored, jstring op))
3963 #if INCLUDE_JFR
3964   freeze_result result = THREAD->last_freeze_fail_result();
3965   assert(result != freeze_ok, "sanity check");
3966   EventVirtualThreadPinned event(UNTIMED);
3967   event.set_starttime(THREAD->last_freeze_fail_time());
3968   if (event.should_commit()) {
3969     ResourceMark rm(THREAD);
3970     const char *str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(op));
3971     THREAD->post_vthread_pinned_event(&event, str, result);
3972   }
3973 #endif
3974 JVM_END
3975 
3976 JVM_ENTRY(jobject, JVM_TakeVirtualThreadListToUnblock(JNIEnv* env, jclass ignored))
3977   ParkEvent* parkEvent = ObjectMonitor::vthread_unparker_ParkEvent();
3978   assert(parkEvent != nullptr, "not initialized");
3979 
3980   OopHandle& list_head = ObjectMonitor::vthread_cxq_head();
3981   oop vthread_head = nullptr;
3982   while (true) {
3983     if (list_head.peek() != nullptr) {
3984       for (;;) {
3985         oop head = list_head.resolve();
3986         if (list_head.cmpxchg(head, nullptr) == head) {
3987           return JNIHandles::make_local(THREAD, head);
3988         }
3989       }
3990     }
3991     ThreadBlockInVM tbivm(THREAD);
3992     parkEvent->park();
3993   }
3994 JVM_END
3995 /*
3996  * Return the current class's class file version.  The low order 16 bits of the
3997  * returned jint contain the class's major version.  The high order 16 bits
3998  * contain the class's minor version.
3999  */
4000 JVM_ENTRY(jint, JVM_GetClassFileVersion(JNIEnv* env, jclass current))
4001   oop mirror = JNIHandles::resolve_non_null(current);
4002   if (java_lang_Class::is_primitive(mirror)) {
4003     // return latest major version and minor version of 0.
4004     return JVM_CLASSFILE_MAJOR_VERSION;
4005   }
4006   assert(!java_lang_Class::as_Klass(mirror)->is_array_klass(), "unexpected array class");
4007 
4008   Klass* c = java_lang_Class::as_Klass(mirror);
4009   assert(c->is_instance_klass(), "must be");
4010   InstanceKlass* ik = InstanceKlass::cast(c);
4011   return (ik->minor_version() << 16) | ik->major_version();
4012 JVM_END
4013 
4014 /*
4015  * Ensure that code doing a stackwalk and using javaVFrame::locals() to
4016  * get the value will see a materialized value and not a scalar-replaced
4017  * null value.
4018  */
4019 JVM_ENTRY(void, JVM_EnsureMaterializedForStackWalk_func(JNIEnv* env, jobject vthread, jobject value))
4020   JVM_EnsureMaterializedForStackWalk(env, value);
4021 JVM_END
4022 
4023 /*
4024  * Return JNI_TRUE if warnings are printed when agents are dynamically loaded.
4025  */
4026 JVM_LEAF(jboolean, JVM_PrintWarningAtDynamicAgentLoad(void))
4027   return (EnableDynamicAgentLoading && !FLAG_IS_CMDLINE(EnableDynamicAgentLoading)) ? JNI_TRUE : JNI_FALSE;
4028 JVM_END