1 /*
   2  * Copyright (c) 1997, 2022, 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 "jvm.h"
  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 "logging/log.hpp"
  52 #include "memory/oopFactory.hpp"
  53 #include "memory/referenceType.hpp"
  54 #include "memory/resourceArea.hpp"
  55 #include "memory/universe.hpp"
  56 #include "oops/access.inline.hpp"
  57 #include "oops/constantPool.hpp"
  58 #include "oops/fieldStreams.inline.hpp"
  59 #include "oops/instanceKlass.hpp"
  60 #include "oops/klass.inline.hpp"
  61 #include "oops/method.hpp"
  62 #include "oops/recordComponent.hpp"
  63 #include "oops/objArrayKlass.hpp"
  64 #include "oops/objArrayOop.inline.hpp"
  65 #include "oops/oop.inline.hpp"
  66 #include "prims/jvm_misc.hpp"
  67 #include "prims/jvmtiExport.hpp"
  68 #include "prims/jvmtiThreadState.inline.hpp"
  69 #include "prims/stackwalk.hpp"
  70 #include "runtime/arguments.hpp"
  71 #include "runtime/atomic.hpp"
  72 #include "runtime/continuation.hpp"
  73 #include "runtime/globals_extension.hpp"
  74 #include "runtime/handles.inline.hpp"
  75 #include "runtime/init.hpp"
  76 #include "runtime/interfaceSupport.inline.hpp"
  77 #include "runtime/deoptimization.hpp"
  78 #include "runtime/handshake.hpp"
  79 #include "runtime/java.hpp"
  80 #include "runtime/javaCalls.hpp"
  81 #include "runtime/javaThread.hpp"
  82 #include "runtime/jfieldIDWorkaround.hpp"
  83 #include "runtime/jniHandles.inline.hpp"
  84 #include "runtime/os.inline.hpp"
  85 #include "runtime/osThread.hpp"
  86 #include "runtime/perfData.hpp"
  87 #include "runtime/reflection.hpp"
  88 #include "runtime/synchronizer.hpp"
  89 #include "runtime/threadIdentifier.hpp"
  90 #include "runtime/threadSMR.hpp"
  91 #include "runtime/vframe.inline.hpp"
  92 #include "runtime/vmOperations.hpp"
  93 #include "runtime/vm_version.hpp"
  94 #include "services/attachListener.hpp"
  95 #include "services/management.hpp"
  96 #include "services/threadService.hpp"
  97 #include "utilities/copy.hpp"
  98 #include "utilities/defaultStream.hpp"
  99 #include "utilities/dtrace.hpp"
 100 #include "utilities/events.hpp"
 101 #include "utilities/macros.hpp"
 102 #include "utilities/utf8.hpp"
 103 #if INCLUDE_CDS
 104 #include "classfile/systemDictionaryShared.hpp"
 105 #endif
 106 #if INCLUDE_JFR
 107 #include "jfr/jfr.hpp"
 108 #endif
 109 #if INCLUDE_MANAGEMENT
 110 #include "services/finalizerService.hpp"
 111 #endif
 112 
 113 #include <errno.h>
 114 
 115 /*
 116   NOTE about use of any ctor or function call that can trigger a safepoint/GC:
 117   such ctors and calls MUST NOT come between an oop declaration/init and its
 118   usage because if objects are move this may cause various memory stomps, bus
 119   errors and segfaults. Here is a cookbook for causing so called "naked oop
 120   failures":
 121 
 122       JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields<etc> {
 123           // Object address to be held directly in mirror & not visible to GC
 124           oop mirror = JNIHandles::resolve_non_null(ofClass);
 125 
 126           // If this ctor can hit a safepoint, moving objects around, then
 127           ComplexConstructor foo;
 128 
 129           // Boom! mirror may point to JUNK instead of the intended object
 130           (some dereference of mirror)
 131 
 132           // Here's another call that may block for GC, making mirror stale
 133           MutexLocker ml(some_lock);
 134 
 135           // And here's an initializer that can result in a stale oop
 136           // all in one step.
 137           oop o = call_that_can_throw_exception(TRAPS);
 138 
 139 
 140   The solution is to keep the oop declaration BELOW the ctor or function
 141   call that might cause a GC, do another resolve to reassign the oop, or
 142   consider use of a Handle instead of an oop so there is immunity from object
 143   motion. But note that the "QUICK" entries below do not have a handlemark
 144   and thus can only support use of handles passed in.
 145 */
 146 
 147 static void trace_class_resolution_impl(Klass* to_class, TRAPS) {
 148   ResourceMark rm;
 149   int line_number = -1;
 150   const char * source_file = NULL;
 151   const char * trace = "explicit";
 152   InstanceKlass* caller = NULL;
 153   JavaThread* jthread = THREAD;
 154   if (jthread->has_last_Java_frame()) {
 155     vframeStream vfst(jthread);
 156 
 157     // scan up the stack skipping ClassLoader, AccessController and PrivilegedAction frames
 158     TempNewSymbol access_controller = SymbolTable::new_symbol("java/security/AccessController");
 159     Klass* access_controller_klass = SystemDictionary::resolve_or_fail(access_controller, false, CHECK);
 160     TempNewSymbol privileged_action = SymbolTable::new_symbol("java/security/PrivilegedAction");
 161     Klass* privileged_action_klass = SystemDictionary::resolve_or_fail(privileged_action, false, CHECK);
 162 
 163     Method* last_caller = NULL;
 164 
 165     while (!vfst.at_end()) {
 166       Method* m = vfst.method();
 167       if (!vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass())&&
 168           !vfst.method()->method_holder()->is_subclass_of(access_controller_klass) &&
 169           !vfst.method()->method_holder()->is_subclass_of(privileged_action_klass)) {
 170         break;
 171       }
 172       last_caller = m;
 173       vfst.next();
 174     }
 175     // if this is called from Class.forName0 and that is called from Class.forName,
 176     // then print the caller of Class.forName.  If this is Class.loadClass, then print
 177     // that caller, otherwise keep quiet since this should be picked up elsewhere.
 178     bool found_it = false;
 179     if (!vfst.at_end() &&
 180         vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 181         vfst.method()->name() == vmSymbols::forName0_name()) {
 182       vfst.next();
 183       if (!vfst.at_end() &&
 184           vfst.method()->method_holder()->name() == vmSymbols::java_lang_Class() &&
 185           vfst.method()->name() == vmSymbols::forName_name()) {
 186         vfst.next();
 187         found_it = true;
 188       }
 189     } else if (last_caller != NULL &&
 190                last_caller->method_holder()->name() ==
 191                  vmSymbols::java_lang_ClassLoader() &&
 192                last_caller->name() == vmSymbols::loadClass_name()) {
 193       found_it = true;
 194     } else if (!vfst.at_end()) {
 195       if (vfst.method()->is_native()) {
 196         // JNI call
 197         found_it = true;
 198       }
 199     }
 200     if (found_it && !vfst.at_end()) {
 201       // found the caller
 202       caller = vfst.method()->method_holder();
 203       line_number = vfst.method()->line_number_from_bci(vfst.bci());
 204       if (line_number == -1) {
 205         // show method name if it's a native method
 206         trace = vfst.method()->name_and_sig_as_C_string();
 207       }
 208       Symbol* s = caller->source_file_name();
 209       if (s != NULL) {
 210         source_file = s->as_C_string();
 211       }
 212     }
 213   }
 214   if (caller != NULL) {
 215     if (to_class != caller) {
 216       const char * from = caller->external_name();
 217       const char * to = to_class->external_name();
 218       // print in a single call to reduce interleaving between threads
 219       if (source_file != NULL) {
 220         log_debug(class, resolve)("%s %s %s:%d (%s)", from, to, source_file, line_number, trace);
 221       } else {
 222         log_debug(class, resolve)("%s %s (%s)", from, to, trace);
 223       }
 224     }
 225   }
 226 }
 227 
 228 void trace_class_resolution(Klass* to_class) {
 229   EXCEPTION_MARK;
 230   trace_class_resolution_impl(to_class, THREAD);
 231   if (HAS_PENDING_EXCEPTION) {
 232     CLEAR_PENDING_EXCEPTION;
 233   }
 234 }
 235 
 236 // java.lang.System //////////////////////////////////////////////////////////////////////
 237 
 238 
 239 JVM_LEAF(jlong, JVM_CurrentTimeMillis(JNIEnv *env, jclass ignored))
 240   return os::javaTimeMillis();
 241 JVM_END
 242 
 243 JVM_LEAF(jlong, JVM_NanoTime(JNIEnv *env, jclass ignored))
 244   return os::javaTimeNanos();
 245 JVM_END
 246 
 247 // The function below is actually exposed by jdk.internal.misc.VM and not
 248 // java.lang.System, but we choose to keep it here so that it stays next
 249 // to JVM_CurrentTimeMillis and JVM_NanoTime
 250 
 251 const jlong MAX_DIFF_SECS = CONST64(0x0100000000); //  2^32
 252 const jlong MIN_DIFF_SECS = -MAX_DIFF_SECS; // -2^32
 253 
 254 JVM_LEAF(jlong, JVM_GetNanoTimeAdjustment(JNIEnv *env, jclass ignored, jlong offset_secs))
 255   jlong seconds;
 256   jlong nanos;
 257 
 258   os::javaTimeSystemUTC(seconds, nanos);
 259 
 260   // We're going to verify that the result can fit in a long.
 261   // For that we need the difference in seconds between 'seconds'
 262   // and 'offset_secs' to be such that:
 263   //     |seconds - offset_secs| < (2^63/10^9)
 264   // We're going to approximate 10^9 ~< 2^30 (1000^3 ~< 1024^3)
 265   // which makes |seconds - offset_secs| < 2^33
 266   // and we will prefer +/- 2^32 as the maximum acceptable diff
 267   // as 2^32 has a more natural feel than 2^33...
 268   //
 269   // So if |seconds - offset_secs| >= 2^32 - we return a special
 270   // sentinel value (-1) which the caller should take as an
 271   // exception value indicating that the offset given to us is
 272   // too far from range of the current time - leading to too big
 273   // a nano adjustment. The caller is expected to recover by
 274   // computing a more accurate offset and calling this method
 275   // again. (For the record 2^32 secs is ~136 years, so that
 276   // should rarely happen)
 277   //
 278   jlong diff = seconds - offset_secs;
 279   if (diff >= MAX_DIFF_SECS || diff <= MIN_DIFF_SECS) {
 280      return -1; // sentinel value: the offset is too far off the target
 281   }
 282 
 283   // return the adjustment. If you compute a time by adding
 284   // this number of nanoseconds along with the number of seconds
 285   // in the offset you should get the current UTC time.
 286   return (diff * (jlong)1000000000) + nanos;
 287 JVM_END
 288 
 289 JVM_ENTRY(void, JVM_ArrayCopy(JNIEnv *env, jclass ignored, jobject src, jint src_pos,
 290                                jobject dst, jint dst_pos, jint length))
 291   // Check if we have null pointers
 292   if (src == NULL || dst == NULL) {
 293     THROW(vmSymbols::java_lang_NullPointerException());
 294   }
 295   arrayOop s = arrayOop(JNIHandles::resolve_non_null(src));
 296   arrayOop d = arrayOop(JNIHandles::resolve_non_null(dst));
 297   assert(oopDesc::is_oop(s), "JVM_ArrayCopy: src not an oop");
 298   assert(oopDesc::is_oop(d), "JVM_ArrayCopy: dst not an oop");
 299   // Do copy
 300   s->klass()->copy_array(s, src_pos, d, dst_pos, length, thread);
 301 JVM_END
 302 
 303 
 304 static void set_property(Handle props, const char* key, const char* value, TRAPS) {
 305   JavaValue r(T_OBJECT);
 306   // public synchronized Object put(Object key, Object value);
 307   HandleMark hm(THREAD);
 308   Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK);
 309   Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK);
 310   JavaCalls::call_virtual(&r,
 311                           props,
 312                           vmClasses::Properties_klass(),
 313                           vmSymbols::put_name(),
 314                           vmSymbols::object_object_object_signature(),
 315                           key_str,
 316                           value_str,
 317                           THREAD);
 318 }
 319 
 320 
 321 #define PUTPROP(props, name, value) set_property((props), (name), (value), CHECK_(properties));
 322 
 323 /*
 324  * Return all of the system properties in a Java String array with alternating
 325  * names and values from the jvm SystemProperty.
 326  * Which includes some internal and all commandline -D defined properties.
 327  */
 328 JVM_ENTRY(jobjectArray, JVM_GetProperties(JNIEnv *env))
 329   ResourceMark rm(THREAD);
 330   HandleMark hm(THREAD);
 331   int ndx = 0;
 332   int fixedCount = 2;
 333 
 334   SystemProperty* p = Arguments::system_properties();
 335   int count = Arguments::PropertyList_count(p);
 336 
 337   // Allocate result String array
 338   InstanceKlass* ik = vmClasses::String_klass();
 339   objArrayOop r = oopFactory::new_objArray(ik, (count + fixedCount) * 2, CHECK_NULL);
 340   objArrayHandle result_h(THREAD, r);
 341 
 342   while (p != NULL) {
 343     const char * key = p->key();
 344     if (strcmp(key, "sun.nio.MaxDirectMemorySize") != 0) {
 345         const char * value = p->value();
 346         Handle key_str    = java_lang_String::create_from_platform_dependent_str(key, CHECK_NULL);
 347         Handle value_str  = java_lang_String::create_from_platform_dependent_str((value != NULL ? value : ""), CHECK_NULL);
 348         result_h->obj_at_put(ndx * 2,  key_str());
 349         result_h->obj_at_put(ndx * 2 + 1, value_str());
 350         ndx++;
 351     }
 352     p = p->next();
 353   }
 354 
 355   // Convert the -XX:MaxDirectMemorySize= command line flag
 356   // to the sun.nio.MaxDirectMemorySize property.
 357   // Do this after setting user properties to prevent people
 358   // from setting the value with a -D option, as requested.
 359   // Leave empty if not supplied
 360   if (!FLAG_IS_DEFAULT(MaxDirectMemorySize)) {
 361     char as_chars[256];
 362     jio_snprintf(as_chars, sizeof(as_chars), JULONG_FORMAT, MaxDirectMemorySize);
 363     Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.nio.MaxDirectMemorySize", CHECK_NULL);
 364     Handle value_str  = java_lang_String::create_from_platform_dependent_str(as_chars, CHECK_NULL);
 365     result_h->obj_at_put(ndx * 2,  key_str());
 366     result_h->obj_at_put(ndx * 2 + 1, value_str());
 367     ndx++;
 368   }
 369 
 370   // JVM monitoring and management support
 371   // Add the sun.management.compiler property for the compiler's name
 372   {
 373 #undef CSIZE
 374 #if defined(_LP64) || defined(_WIN64)
 375   #define CSIZE "64-Bit "
 376 #else
 377   #define CSIZE
 378 #endif // 64bit
 379 
 380 #if COMPILER1_AND_COMPILER2
 381     const char* compiler_name = "HotSpot " CSIZE "Tiered Compilers";
 382 #else
 383 #if defined(COMPILER1)
 384     const char* compiler_name = "HotSpot " CSIZE "Client Compiler";
 385 #elif defined(COMPILER2)
 386     const char* compiler_name = "HotSpot " CSIZE "Server Compiler";
 387 #elif INCLUDE_JVMCI
 388     #error "INCLUDE_JVMCI should imply COMPILER1_OR_COMPILER2"
 389 #else
 390     const char* compiler_name = "";
 391 #endif // compilers
 392 #endif // COMPILER1_AND_COMPILER2
 393 
 394     if (*compiler_name != '\0' &&
 395         (Arguments::mode() != Arguments::_int)) {
 396       Handle key_str = java_lang_String::create_from_platform_dependent_str("sun.management.compiler", CHECK_NULL);
 397       Handle value_str  = java_lang_String::create_from_platform_dependent_str(compiler_name, CHECK_NULL);
 398       result_h->obj_at_put(ndx * 2,  key_str());
 399       result_h->obj_at_put(ndx * 2 + 1, value_str());
 400       ndx++;
 401     }
 402   }
 403 
 404   return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
 405 JVM_END
 406 
 407 
 408 /*
 409  * Return the temporary directory that the VM uses for the attach
 410  * and perf data files.
 411  *
 412  * It is important that this directory is well-known and the
 413  * same for all VM instances. It cannot be affected by configuration
 414  * variables such as java.io.tmpdir.
 415  */
 416 JVM_ENTRY(jstring, JVM_GetTemporaryDirectory(JNIEnv *env))
 417   HandleMark hm(THREAD);
 418   const char* temp_dir = os::get_temp_directory();
 419   Handle h = java_lang_String::create_from_platform_dependent_str(temp_dir, CHECK_NULL);
 420   return (jstring) JNIHandles::make_local(THREAD, h());
 421 JVM_END
 422 
 423 
 424 // java.lang.Runtime /////////////////////////////////////////////////////////////////////////
 425 
 426 extern volatile jint vm_created;
 427 
 428 JVM_ENTRY_NO_ENV(void, JVM_BeforeHalt())
 429 #if INCLUDE_CDS
 430   // Link all classes for dynamic CDS dumping before vm exit.
 431   if (DynamicArchive::should_dump_at_vm_exit()) {
 432     DynamicArchive::prepare_for_dump_at_exit();
 433   }
 434 #endif
 435   EventShutdown event;
 436   if (event.should_commit()) {
 437     event.set_reason("Shutdown requested from Java");
 438     event.commit();
 439   }
 440 JVM_END
 441 
 442 
 443 JVM_ENTRY_NO_ENV(void, JVM_Halt(jint code))
 444   before_exit(thread);
 445   vm_exit(code);
 446 JVM_END
 447 
 448 
 449 JVM_ENTRY_NO_ENV(void, JVM_GC(void))
 450   if (!DisableExplicitGC) {
 451     EventSystemGC event;
 452     event.set_invokedConcurrent(ExplicitGCInvokesConcurrent);
 453     Universe::heap()->collect(GCCause::_java_lang_system_gc);
 454     event.commit();
 455   }
 456 JVM_END
 457 
 458 
 459 JVM_LEAF(jlong, JVM_MaxObjectInspectionAge(void))
 460   return Universe::heap()->millis_since_last_whole_heap_examined();
 461 JVM_END
 462 
 463 
 464 static inline jlong convert_size_t_to_jlong(size_t val) {
 465   // In the 64-bit vm, a size_t can overflow a jlong (which is signed).
 466   NOT_LP64 (return (jlong)val;)
 467   LP64_ONLY(return (jlong)MIN2(val, (size_t)max_jlong);)
 468 }
 469 
 470 JVM_ENTRY_NO_ENV(jlong, JVM_TotalMemory(void))
 471   size_t n = Universe::heap()->capacity();
 472   return convert_size_t_to_jlong(n);
 473 JVM_END
 474 
 475 
 476 JVM_ENTRY_NO_ENV(jlong, JVM_FreeMemory(void))
 477   size_t n = Universe::heap()->unused();
 478   return convert_size_t_to_jlong(n);
 479 JVM_END
 480 
 481 
 482 JVM_ENTRY_NO_ENV(jlong, JVM_MaxMemory(void))
 483   size_t n = Universe::heap()->max_capacity();
 484   return convert_size_t_to_jlong(n);
 485 JVM_END
 486 
 487 
 488 JVM_ENTRY_NO_ENV(jint, JVM_ActiveProcessorCount(void))
 489   return os::active_processor_count();
 490 JVM_END
 491 
 492 JVM_LEAF(jboolean, JVM_IsUseContainerSupport(void))
 493 #ifdef LINUX
 494   if (UseContainerSupport) {
 495     return JNI_TRUE;
 496   }
 497 #endif
 498   return JNI_FALSE;
 499 JVM_END
 500 
 501 // java.lang.Throwable //////////////////////////////////////////////////////
 502 
 503 JVM_ENTRY(void, JVM_FillInStackTrace(JNIEnv *env, jobject receiver))
 504   Handle exception(thread, JNIHandles::resolve_non_null(receiver));
 505   java_lang_Throwable::fill_in_stack_trace(exception);
 506 JVM_END
 507 
 508 // java.lang.NullPointerException ///////////////////////////////////////////
 509 
 510 JVM_ENTRY(jstring, JVM_GetExtendedNPEMessage(JNIEnv *env, jthrowable throwable))
 511   if (!ShowCodeDetailsInExceptionMessages) return NULL;
 512 
 513   oop exc = JNIHandles::resolve_non_null(throwable);
 514 
 515   Method* method;
 516   int bci;
 517   if (!java_lang_Throwable::get_top_method_and_bci(exc, &method, &bci)) {
 518     return NULL;
 519   }
 520   if (method->is_native()) {
 521     return NULL;
 522   }
 523 
 524   stringStream ss;
 525   bool ok = BytecodeUtils::get_NPE_message_at(&ss, method, bci);
 526   if (ok) {
 527     oop result = java_lang_String::create_oop_from_str(ss.base(), CHECK_NULL);
 528     return (jstring) JNIHandles::make_local(THREAD, result);
 529   } else {
 530     return NULL;
 531   }
 532 JVM_END
 533 
 534 // java.lang.StackTraceElement //////////////////////////////////////////////
 535 
 536 
 537 JVM_ENTRY(void, JVM_InitStackTraceElementArray(JNIEnv *env, jobjectArray elements, jobject backtrace, jint depth))
 538   Handle backtraceh(THREAD, JNIHandles::resolve(backtrace));
 539   objArrayOop st = objArrayOop(JNIHandles::resolve(elements));
 540   objArrayHandle stack_trace(THREAD, st);
 541   // Fill in the allocated stack trace
 542   java_lang_Throwable::get_stack_trace_elements(depth, backtraceh, stack_trace, CHECK);
 543 JVM_END
 544 
 545 
 546 JVM_ENTRY(void, JVM_InitStackTraceElement(JNIEnv* env, jobject element, jobject stackFrameInfo))
 547   Handle stack_frame_info(THREAD, JNIHandles::resolve_non_null(stackFrameInfo));
 548   Handle stack_trace_element(THREAD, JNIHandles::resolve_non_null(element));
 549   java_lang_StackFrameInfo::to_stack_trace_element(stack_frame_info, stack_trace_element, THREAD);
 550 JVM_END
 551 
 552 
 553 // java.lang.StackWalker //////////////////////////////////////////////////////
 554 
 555 
 556 JVM_ENTRY(jobject, JVM_CallStackWalk(JNIEnv *env, jobject stackStream, jlong mode,
 557                                      jint skip_frames, jobject contScope, jobject cont,
 558                                      jint frame_count, jint start_index, jobjectArray frames))
 559   if (!thread->has_last_Java_frame()) {
 560     THROW_MSG_(vmSymbols::java_lang_InternalError(), "doStackWalk: no stack trace", NULL);
 561   }
 562 
 563   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 564   Handle contScope_h(THREAD, JNIHandles::resolve(contScope));
 565   Handle cont_h(THREAD, JNIHandles::resolve(cont));
 566   // frames array is a Class<?>[] array when only getting caller reference,
 567   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 568   // be null.
 569   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 570   objArrayHandle frames_array_h(THREAD, fa);
 571 
 572   int limit = start_index + frame_count;
 573   if (frames_array_h->length() < limit) {
 574     THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers", NULL);
 575   }
 576 
 577   oop result = StackWalk::walk(stackStream_h, mode, skip_frames, contScope_h, cont_h,
 578                                frame_count, start_index, frames_array_h, CHECK_NULL);
 579   return JNIHandles::make_local(THREAD, result);
 580 JVM_END
 581 
 582 
 583 JVM_ENTRY(jint, JVM_MoreStackWalk(JNIEnv *env, jobject stackStream, jlong mode, jlong anchor,
 584                                   jint frame_count, jint start_index,
 585                                   jobjectArray frames))
 586   // frames array is a Class<?>[] array when only getting caller reference,
 587   // and a StackFrameInfo[] array (or derivative) otherwise. It should never
 588   // be null.
 589   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 590   objArrayHandle frames_array_h(THREAD, fa);
 591 
 592   int limit = start_index+frame_count;
 593   if (frames_array_h->length() < limit) {
 594     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "not enough space in buffers");
 595   }
 596 
 597   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 598   return StackWalk::fetchNextBatch(stackStream_h, mode, anchor, frame_count,
 599                                   start_index, frames_array_h, THREAD);
 600 JVM_END
 601 
 602 JVM_ENTRY(void, JVM_SetStackWalkContinuation(JNIEnv *env, jobject stackStream, jlong anchor, jobjectArray frames, jobject cont))
 603   objArrayOop fa = objArrayOop(JNIHandles::resolve_non_null(frames));
 604   objArrayHandle frames_array_h(THREAD, fa);
 605   Handle stackStream_h(THREAD, JNIHandles::resolve_non_null(stackStream));
 606   Handle cont_h(THREAD, JNIHandles::resolve_non_null(cont));
 607 
 608   StackWalk::setContinuation(stackStream_h, anchor, frames_array_h, cont_h, THREAD);
 609 JVM_END
 610 
 611 // java.lang.Object ///////////////////////////////////////////////
 612 
 613 
 614 JVM_ENTRY(jint, JVM_IHashCode(JNIEnv* env, jobject handle))
 615   // as implemented in the classic virtual machine; return 0 if object is NULL
 616   return handle == NULL ? 0 : ObjectSynchronizer::FastHashCode (THREAD, JNIHandles::resolve_non_null(handle)) ;
 617 JVM_END
 618 
 619 
 620 JVM_ENTRY(void, JVM_MonitorWait(JNIEnv* env, jobject handle, jlong ms))
 621   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 622   JavaThreadInObjectWaitState jtiows(thread, ms != 0);
 623   if (JvmtiExport::should_post_monitor_wait()) {
 624     JvmtiExport::post_monitor_wait(thread, obj(), ms);
 625 
 626     // The current thread already owns the monitor and it has not yet
 627     // been added to the wait queue so the current thread cannot be
 628     // made the successor. This means that the JVMTI_EVENT_MONITOR_WAIT
 629     // event handler cannot accidentally consume an unpark() meant for
 630     // the ParkEvent associated with this ObjectMonitor.
 631   }
 632   ObjectSynchronizer::wait(obj, ms, CHECK);
 633 JVM_END
 634 
 635 
 636 JVM_ENTRY(void, JVM_MonitorNotify(JNIEnv* env, jobject handle))
 637   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 638   ObjectSynchronizer::notify(obj, CHECK);
 639 JVM_END
 640 
 641 
 642 JVM_ENTRY(void, JVM_MonitorNotifyAll(JNIEnv* env, jobject handle))
 643   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 644   ObjectSynchronizer::notifyall(obj, CHECK);
 645 JVM_END
 646 
 647 
 648 JVM_ENTRY(jobject, JVM_Clone(JNIEnv* env, jobject handle))
 649   Handle obj(THREAD, JNIHandles::resolve_non_null(handle));
 650   Klass* klass = obj->klass();
 651   JvmtiVMObjectAllocEventCollector oam;
 652 
 653 #ifdef ASSERT
 654   // Just checking that the cloneable flag is set correct
 655   if (obj->is_array()) {
 656     guarantee(klass->is_cloneable(), "all arrays are cloneable");
 657   } else {
 658     guarantee(obj->is_instance(), "should be instanceOop");
 659     bool cloneable = klass->is_subtype_of(vmClasses::Cloneable_klass());
 660     guarantee(cloneable == klass->is_cloneable(), "incorrect cloneable flag");
 661   }
 662 #endif
 663 
 664   // Check if class of obj supports the Cloneable interface.
 665   // All arrays are considered to be cloneable (See JLS 20.1.5).
 666   // All j.l.r.Reference classes are considered non-cloneable.
 667   if (!klass->is_cloneable() ||
 668       (klass->is_instance_klass() &&
 669        InstanceKlass::cast(klass)->reference_type() != REF_NONE)) {
 670     ResourceMark rm(THREAD);
 671     THROW_MSG_0(vmSymbols::java_lang_CloneNotSupportedException(), klass->external_name());
 672   }
 673 
 674   // Make shallow object copy
 675   const size_t size = obj->size();
 676   oop new_obj_oop = NULL;
 677   if (obj->is_array()) {
 678     const int length = ((arrayOop)obj())->length();
 679     new_obj_oop = Universe::heap()->array_allocate(klass, size, length,
 680                                                    /* do_zero */ true, CHECK_NULL);
 681   } else {
 682     new_obj_oop = Universe::heap()->obj_allocate(klass, size, CHECK_NULL);
 683   }
 684 
 685   HeapAccess<>::clone(obj(), new_obj_oop, size);
 686 
 687   Handle new_obj(THREAD, new_obj_oop);
 688   // Caution: this involves a java upcall, so the clone should be
 689   // "gc-robust" by this stage.
 690   if (klass->has_finalizer()) {
 691     assert(obj->is_instance(), "should be instanceOop");
 692     new_obj_oop = InstanceKlass::register_finalizer(instanceOop(new_obj()), CHECK_NULL);
 693     new_obj = Handle(THREAD, new_obj_oop);
 694   }
 695 
 696   return JNIHandles::make_local(THREAD, new_obj());
 697 JVM_END
 698 
 699 // java.lang.ref.Finalizer ////////////////////////////////////////////////////
 700 
 701 JVM_ENTRY(void, JVM_ReportFinalizationComplete(JNIEnv * env, jobject finalizee))
 702   MANAGEMENT_ONLY(FinalizerService::on_complete(JNIHandles::resolve_non_null(finalizee), THREAD);)
 703 JVM_END
 704 
 705 JVM_LEAF(jboolean, JVM_IsFinalizationEnabled(JNIEnv * env))
 706   return InstanceKlass::is_finalization_enabled();
 707 JVM_END
 708 
 709 // jdk.internal.vm.Continuation /////////////////////////////////////////////////////
 710 
 711 JVM_ENTRY(void, JVM_RegisterContinuationMethods(JNIEnv *env, jclass cls))
 712   CONT_RegisterNativeMethods(env, cls);
 713 JVM_END
 714 
 715 // java.io.File ///////////////////////////////////////////////////////////////
 716 
 717 JVM_LEAF(char*, JVM_NativePath(char* path))
 718   return os::native_path(path);
 719 JVM_END
 720 
 721 
 722 // Misc. class handling ///////////////////////////////////////////////////////////
 723 
 724 
 725 JVM_ENTRY(jclass, JVM_GetCallerClass(JNIEnv* env))
 726   // Getting the class of the caller frame.
 727   //
 728   // The call stack at this point looks something like this:
 729   //
 730   // [0] [ @CallerSensitive public sun.reflect.Reflection.getCallerClass ]
 731   // [1] [ @CallerSensitive API.method                                   ]
 732   // [.] [ (skipped intermediate frames)                                 ]
 733   // [n] [ caller                                                        ]
 734   vframeStream vfst(thread);
 735   // Cf. LibraryCallKit::inline_native_Reflection_getCallerClass
 736   for (int n = 0; !vfst.at_end(); vfst.security_next(), n++) {
 737     Method* m = vfst.method();
 738     assert(m != NULL, "sanity");
 739     switch (n) {
 740     case 0:
 741       // This must only be called from Reflection.getCallerClass
 742       if (m->intrinsic_id() != vmIntrinsics::_getCallerClass) {
 743         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetCallerClass must only be called from Reflection.getCallerClass");
 744       }
 745       // fall-through
 746     case 1:
 747       // Frame 0 and 1 must be caller sensitive.
 748       if (!m->caller_sensitive()) {
 749         THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), err_msg("CallerSensitive annotation expected at frame %d", n));
 750       }
 751       break;
 752     default:
 753       if (!m->is_ignored_by_security_stack_walk()) {
 754         // We have reached the desired frame; return the holder class.
 755         return (jclass) JNIHandles::make_local(THREAD, m->method_holder()->java_mirror());
 756       }
 757       break;
 758     }
 759   }
 760   return NULL;
 761 JVM_END
 762 
 763 
 764 JVM_ENTRY(jclass, JVM_FindPrimitiveClass(JNIEnv* env, const char* utf))
 765   oop mirror = NULL;
 766   BasicType t = name2type(utf);
 767   if (t != T_ILLEGAL && !is_reference_type(t)) {
 768     mirror = Universe::java_mirror(t);
 769   }
 770   if (mirror == NULL) {
 771     THROW_MSG_0(vmSymbols::java_lang_ClassNotFoundException(), (char*) utf);
 772   } else {
 773     return (jclass) JNIHandles::make_local(THREAD, mirror);
 774   }
 775 JVM_END
 776 
 777 
 778 // Returns a class loaded by the bootstrap class loader; or null
 779 // if not found.  ClassNotFoundException is not thrown.
 780 // FindClassFromBootLoader is exported to the launcher for windows.
 781 JVM_ENTRY(jclass, JVM_FindClassFromBootLoader(JNIEnv* env,
 782                                               const char* name))
 783   // Java libraries should ensure that name is never null or illegal.
 784   if (name == NULL || (int)strlen(name) > Symbol::max_length()) {
 785     // It's impossible to create this class;  the name cannot fit
 786     // into the constant pool.
 787     return NULL;
 788   }
 789   assert(UTF8::is_legal_utf8((const unsigned char*)name, (int)strlen(name), false), "illegal UTF name");
 790 
 791   TempNewSymbol h_name = SymbolTable::new_symbol(name);
 792   Klass* k = SystemDictionary::resolve_or_null(h_name, CHECK_NULL);
 793   if (k == NULL) {
 794     return NULL;
 795   }
 796 
 797   if (log_is_enabled(Debug, class, resolve)) {
 798     trace_class_resolution(k);
 799   }
 800   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
 801 JVM_END
 802 
 803 // Find a class with this name in this loader, using the caller's protection domain.
 804 JVM_ENTRY(jclass, JVM_FindClassFromCaller(JNIEnv* env, const char* name,
 805                                           jboolean init, jobject loader,
 806                                           jclass caller))
 807   TempNewSymbol h_name =
 808        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
 809                                            CHECK_NULL);
 810 
 811   oop loader_oop = JNIHandles::resolve(loader);
 812   oop from_class = JNIHandles::resolve(caller);
 813   oop protection_domain = NULL;
 814   // If loader is null, shouldn't call ClassLoader.checkPackageAccess; otherwise get
 815   // NPE. Put it in another way, the bootstrap class loader has all permission and
 816   // thus no checkPackageAccess equivalence in the VM class loader.
 817   // The caller is also passed as NULL by the java code if there is no security
 818   // manager to avoid the performance cost of getting the calling class.
 819   if (from_class != NULL && loader_oop != NULL) {
 820     protection_domain = java_lang_Class::as_Klass(from_class)->protection_domain();
 821   }
 822 
 823   Handle h_loader(THREAD, loader_oop);
 824   Handle h_prot(THREAD, protection_domain);
 825   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 826                                                h_prot, false, THREAD);
 827 
 828   if (log_is_enabled(Debug, class, resolve) && result != NULL) {
 829     trace_class_resolution(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(result)));
 830   }
 831   return result;
 832 JVM_END
 833 
 834 // Currently only called from the old verifier.
 835 JVM_ENTRY(jclass, JVM_FindClassFromClass(JNIEnv *env, const char *name,
 836                                          jboolean init, jclass from))
 837   TempNewSymbol h_name =
 838        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_ClassNotFoundException(),
 839                                            CHECK_NULL);
 840   oop from_class_oop = JNIHandles::resolve(from);
 841   Klass* from_class = (from_class_oop == NULL)
 842                            ? (Klass*)NULL
 843                            : java_lang_Class::as_Klass(from_class_oop);
 844   oop class_loader = NULL;
 845   oop protection_domain = NULL;
 846   if (from_class != NULL) {
 847     class_loader = from_class->class_loader();
 848     protection_domain = from_class->protection_domain();
 849   }
 850   Handle h_loader(THREAD, class_loader);
 851   Handle h_prot  (THREAD, protection_domain);
 852   jclass result = find_class_from_class_loader(env, h_name, init, h_loader,
 853                                                h_prot, true, thread);
 854 
 855   if (log_is_enabled(Debug, class, resolve) && result != NULL) {
 856     // this function is generally only used for class loading during verification.
 857     ResourceMark rm;
 858     oop from_mirror = JNIHandles::resolve_non_null(from);
 859     Klass* from_class = java_lang_Class::as_Klass(from_mirror);
 860     const char * from_name = from_class->external_name();
 861 
 862     oop mirror = JNIHandles::resolve_non_null(result);
 863     Klass* to_class = java_lang_Class::as_Klass(mirror);
 864     const char * to = to_class->external_name();
 865     log_debug(class, resolve)("%s %s (verification)", from_name, to);
 866   }
 867 
 868   return result;
 869 JVM_END
 870 
 871 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
 872 static jclass jvm_define_class_common(const char *name,
 873                                       jobject loader, const jbyte *buf,
 874                                       jsize len, jobject pd, const char *source,
 875                                       TRAPS) {
 876   if (source == NULL)  source = "__JVM_DefineClass__";
 877 
 878   JavaThread* jt = THREAD;
 879 
 880   PerfClassTraceTime vmtimer(ClassLoader::perf_define_appclass_time(),
 881                              ClassLoader::perf_define_appclass_selftime(),
 882                              ClassLoader::perf_define_appclasses(),
 883                              jt->get_thread_stat()->perf_recursion_counts_addr(),
 884                              jt->get_thread_stat()->perf_timers_addr(),
 885                              PerfClassTraceTime::DEFINE_CLASS);
 886 
 887   if (UsePerfData) {
 888     ClassLoader::perf_app_classfile_bytes_read()->inc(len);
 889   }
 890 
 891   // Class resolution will get the class name from the .class stream if the name is null.
 892   TempNewSymbol class_name = name == NULL ? NULL :
 893        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
 894                                            CHECK_NULL);
 895 
 896   ResourceMark rm(THREAD);
 897   ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
 898   Handle class_loader (THREAD, JNIHandles::resolve(loader));
 899   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
 900   ClassLoadInfo cl_info(protection_domain);
 901   Klass* k = SystemDictionary::resolve_from_stream(&st, class_name,
 902                                                    class_loader,
 903                                                    cl_info,
 904                                                    CHECK_NULL);
 905 
 906   if (log_is_enabled(Debug, class, resolve)) {
 907     trace_class_resolution(k);
 908   }
 909 
 910   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
 911 }
 912 
 913 enum {
 914   NESTMATE              = java_lang_invoke_MemberName::MN_NESTMATE_CLASS,
 915   HIDDEN_CLASS          = java_lang_invoke_MemberName::MN_HIDDEN_CLASS,
 916   STRONG_LOADER_LINK    = java_lang_invoke_MemberName::MN_STRONG_LOADER_LINK,
 917   ACCESS_VM_ANNOTATIONS = java_lang_invoke_MemberName::MN_ACCESS_VM_ANNOTATIONS
 918 };
 919 
 920 /*
 921  * Define a class with the specified flags that indicates if it's a nestmate,
 922  * hidden, or strongly referenced from class loader.
 923  */
 924 static jclass jvm_lookup_define_class(jclass lookup, const char *name,
 925                                       const jbyte *buf, jsize len, jobject pd,
 926                                       jboolean init, int flags, jobject classData, TRAPS) {
 927   ResourceMark rm(THREAD);
 928 
 929   Klass* lookup_k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(lookup));
 930   // Lookup class must be a non-null instance
 931   if (lookup_k == NULL) {
 932     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
 933   }
 934   assert(lookup_k->is_instance_klass(), "Lookup class must be an instance klass");
 935 
 936   Handle class_loader (THREAD, lookup_k->class_loader());
 937 
 938   bool is_nestmate = (flags & NESTMATE) == NESTMATE;
 939   bool is_hidden = (flags & HIDDEN_CLASS) == HIDDEN_CLASS;
 940   bool is_strong = (flags & STRONG_LOADER_LINK) == STRONG_LOADER_LINK;
 941   bool vm_annotations = (flags & ACCESS_VM_ANNOTATIONS) == ACCESS_VM_ANNOTATIONS;
 942 
 943   InstanceKlass* host_class = NULL;
 944   if (is_nestmate) {
 945     host_class = InstanceKlass::cast(lookup_k)->nest_host(CHECK_NULL);
 946   }
 947 
 948   log_info(class, nestmates)("LookupDefineClass: %s - %s%s, %s, %s, %s",
 949                              name,
 950                              is_nestmate ? "with dynamic nest-host " : "non-nestmate",
 951                              is_nestmate ? host_class->external_name() : "",
 952                              is_hidden ? "hidden" : "not hidden",
 953                              is_strong ? "strong" : "weak",
 954                              vm_annotations ? "with vm annotations" : "without vm annotation");
 955 
 956   if (!is_hidden) {
 957     // classData is only applicable for hidden classes
 958     if (classData != NULL) {
 959       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "classData is only applicable for hidden classes");
 960     }
 961     if (is_nestmate) {
 962       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "dynamic nestmate is only applicable for hidden classes");
 963     }
 964     if (!is_strong) {
 965       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "an ordinary class must be strongly referenced by its defining loader");
 966     }
 967     if (vm_annotations) {
 968       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "vm annotations only allowed for hidden classes");
 969     }
 970     if (flags != STRONG_LOADER_LINK) {
 971       THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
 972                   err_msg("invalid flag 0x%x", flags));
 973     }
 974   }
 975 
 976   // Class resolution will get the class name from the .class stream if the name is null.
 977   TempNewSymbol class_name = name == NULL ? NULL :
 978        SystemDictionary::class_name_symbol(name, vmSymbols::java_lang_NoClassDefFoundError(),
 979                                            CHECK_NULL);
 980 
 981   Handle protection_domain (THREAD, JNIHandles::resolve(pd));
 982   const char* source = is_nestmate ? host_class->external_name() : "__JVM_LookupDefineClass__";
 983   ClassFileStream st((u1*)buf, len, source, ClassFileStream::verify);
 984 
 985   InstanceKlass* ik = NULL;
 986   if (!is_hidden) {
 987     ClassLoadInfo cl_info(protection_domain);
 988     ik = SystemDictionary::resolve_from_stream(&st, class_name,
 989                                                class_loader,
 990                                                cl_info,
 991                                                CHECK_NULL);
 992 
 993     if (log_is_enabled(Debug, class, resolve)) {
 994       trace_class_resolution(ik);
 995     }
 996   } else { // hidden
 997     Handle classData_h(THREAD, JNIHandles::resolve(classData));
 998     ClassLoadInfo cl_info(protection_domain,
 999                           host_class,
1000                           classData_h,
1001                           is_hidden,
1002                           is_strong,
1003                           vm_annotations);
1004     ik = SystemDictionary::resolve_from_stream(&st, class_name,
1005                                                class_loader,
1006                                                cl_info,
1007                                                CHECK_NULL);
1008 
1009     // The hidden class loader data has been artificially been kept alive to
1010     // this point. The mirror and any instances of this class have to keep
1011     // it alive afterwards.
1012     ik->class_loader_data()->dec_keep_alive();
1013 
1014     if (is_nestmate && log_is_enabled(Debug, class, nestmates)) {
1015       ModuleEntry* module = ik->module();
1016       const char * module_name = module->is_named() ? module->name()->as_C_string() : UNNAMED_MODULE;
1017       log_debug(class, nestmates)("Dynamic nestmate: %s/%s, nest_host %s, %s",
1018                                   module_name,
1019                                   ik->external_name(),
1020                                   host_class->external_name(),
1021                                   ik->is_hidden() ? "is hidden" : "is not hidden");
1022     }
1023   }
1024   assert(Reflection::is_same_class_package(lookup_k, ik),
1025          "lookup class and defined class are in different packages");
1026 
1027   if (init) {
1028     ik->initialize(CHECK_NULL);
1029   } else {
1030     ik->link_class(CHECK_NULL);
1031   }
1032 
1033   return (jclass) JNIHandles::make_local(THREAD, ik->java_mirror());
1034 }
1035 
1036 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
1037   return jvm_define_class_common(name, loader, buf, len, pd, NULL, THREAD);
1038 JVM_END
1039 
1040 /*
1041  * Define a class with the specified lookup class.
1042  *  lookup:  Lookup class
1043  *  name:    the name of the class
1044  *  buf:     class bytes
1045  *  len:     length of class bytes
1046  *  pd:      protection domain
1047  *  init:    initialize the class
1048  *  flags:   properties of the class
1049  *  classData: private static pre-initialized field
1050  */
1051 JVM_ENTRY(jclass, JVM_LookupDefineClass(JNIEnv *env, jclass lookup, const char *name, const jbyte *buf,
1052           jsize len, jobject pd, jboolean initialize, int flags, jobject classData))
1053 
1054   if (lookup == NULL) {
1055     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null");
1056   }
1057 
1058   assert(buf != NULL, "buf must not be NULL");
1059 
1060   return jvm_lookup_define_class(lookup, name, buf, len, pd, initialize, flags, classData, THREAD);
1061 JVM_END
1062 
1063 JVM_ENTRY(jclass, JVM_DefineClassWithSource(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source))
1064 
1065   return jvm_define_class_common(name, loader, buf, len, pd, source, THREAD);
1066 JVM_END
1067 
1068 JVM_ENTRY(jclass, JVM_FindLoadedClass(JNIEnv *env, jobject loader, jstring name))
1069   ResourceMark rm(THREAD);
1070 
1071   Handle h_name (THREAD, JNIHandles::resolve_non_null(name));
1072   char* str = java_lang_String::as_utf8_string(h_name());
1073 
1074   // Sanity check, don't expect null
1075   if (str == NULL) return NULL;
1076 
1077   // Internalize the string, converting '.' to '/' in string.
1078   char* p = (char*)str;
1079   while (*p != '\0') {
1080     if (*p == '.') {
1081       *p = '/';
1082     }
1083     p++;
1084   }
1085 
1086   const int str_len = (int)(p - str);
1087   if (str_len > Symbol::max_length()) {
1088     // It's impossible to create this class;  the name cannot fit
1089     // into the constant pool.
1090     return NULL;
1091   }
1092   TempNewSymbol klass_name = SymbolTable::new_symbol(str, str_len);
1093 
1094   // Security Note:
1095   //   The Java level wrapper will perform the necessary security check allowing
1096   //   us to pass the NULL as the initiating class loader.
1097   Handle h_loader(THREAD, JNIHandles::resolve(loader));
1098   Klass* k = SystemDictionary::find_instance_or_array_klass(klass_name,
1099                                                               h_loader,
1100                                                               Handle());
1101 #if INCLUDE_CDS
1102   if (k == NULL) {
1103     // If the class is not already loaded, try to see if it's in the shared
1104     // archive for the current classloader (h_loader).
1105     k = SystemDictionaryShared::find_or_load_shared_class(klass_name, h_loader, CHECK_NULL);
1106   }
1107 #endif
1108   return (k == NULL) ? NULL :
1109             (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
1110 JVM_END
1111 
1112 // Module support //////////////////////////////////////////////////////////////////////////////
1113 
1114 JVM_ENTRY(void, JVM_DefineModule(JNIEnv *env, jobject module, jboolean is_open, jstring version,
1115                                  jstring location, jobjectArray packages))
1116   Handle h_module (THREAD, JNIHandles::resolve(module));
1117   Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1118 JVM_END
1119 
1120 JVM_ENTRY(void, JVM_SetBootLoaderUnnamedModule(JNIEnv *env, jobject module))
1121   Handle h_module (THREAD, JNIHandles::resolve(module));
1122   Modules::set_bootloader_unnamed_module(h_module, CHECK);
1123 JVM_END
1124 
1125 JVM_ENTRY(void, JVM_AddModuleExports(JNIEnv *env, jobject from_module, jstring package, jobject to_module))
1126   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1127   Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1128   Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1129 JVM_END
1130 
1131 JVM_ENTRY(void, JVM_AddModuleExportsToAllUnnamed(JNIEnv *env, jobject from_module, jstring package))
1132   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1133   Modules::add_module_exports_to_all_unnamed(h_from_module, package, CHECK);
1134 JVM_END
1135 
1136 JVM_ENTRY(void, JVM_AddModuleExportsToAll(JNIEnv *env, jobject from_module, jstring package))
1137   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1138   Modules::add_module_exports(h_from_module, package, Handle(), CHECK);
1139 JVM_END
1140 
1141 JVM_ENTRY (void, JVM_AddReadsModule(JNIEnv *env, jobject from_module, jobject source_module))
1142   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1143   Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1144   Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1145 JVM_END
1146 
1147 JVM_ENTRY(void, JVM_DefineArchivedModules(JNIEnv *env, jobject platform_loader, jobject system_loader))
1148   Handle h_platform_loader (THREAD, JNIHandles::resolve(platform_loader));
1149   Handle h_system_loader (THREAD, JNIHandles::resolve(system_loader));
1150   Modules::define_archived_modules(h_platform_loader, h_system_loader, CHECK);
1151 JVM_END
1152 
1153 // Reflection support //////////////////////////////////////////////////////////////////////////////
1154 
1155 JVM_ENTRY(jstring, JVM_InitClassName(JNIEnv *env, jclass cls))
1156   assert (cls != NULL, "illegal class");
1157   JvmtiVMObjectAllocEventCollector oam;
1158   ResourceMark rm(THREAD);
1159   HandleMark hm(THREAD);
1160   Handle java_class(THREAD, JNIHandles::resolve(cls));
1161   oop result = java_lang_Class::name(java_class, CHECK_NULL);
1162   return (jstring) JNIHandles::make_local(THREAD, result);
1163 JVM_END
1164 
1165 
1166 JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
1167   JvmtiVMObjectAllocEventCollector oam;
1168   oop mirror = JNIHandles::resolve_non_null(cls);
1169 
1170   // Special handling for primitive objects
1171   if (java_lang_Class::is_primitive(mirror)) {
1172     // Primitive objects does not have any interfaces
1173     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1174     return (jobjectArray) JNIHandles::make_local(THREAD, r);
1175   }
1176 
1177   Klass* klass = java_lang_Class::as_Klass(mirror);
1178   // Figure size of result array
1179   int size;
1180   if (klass->is_instance_klass()) {
1181     size = InstanceKlass::cast(klass)->local_interfaces()->length();
1182   } else {
1183     assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
1184     size = 2;
1185   }
1186 
1187   // Allocate result array
1188   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), size, CHECK_NULL);
1189   objArrayHandle result (THREAD, r);
1190   // Fill in result
1191   if (klass->is_instance_klass()) {
1192     // Regular instance klass, fill in all local interfaces
1193     for (int index = 0; index < size; index++) {
1194       Klass* k = InstanceKlass::cast(klass)->local_interfaces()->at(index);
1195       result->obj_at_put(index, k->java_mirror());
1196     }
1197   } else {
1198     // All arrays implement java.lang.Cloneable and java.io.Serializable
1199     result->obj_at_put(0, vmClasses::Cloneable_klass()->java_mirror());
1200     result->obj_at_put(1, vmClasses::Serializable_klass()->java_mirror());
1201   }
1202   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1203 JVM_END
1204 
1205 
1206 JVM_ENTRY(jboolean, JVM_IsInterface(JNIEnv *env, jclass cls))
1207   oop mirror = JNIHandles::resolve_non_null(cls);
1208   if (java_lang_Class::is_primitive(mirror)) {
1209     return JNI_FALSE;
1210   }
1211   Klass* k = java_lang_Class::as_Klass(mirror);
1212   jboolean result = k->is_interface();
1213   assert(!result || k->is_instance_klass(),
1214          "all interfaces are instance types");
1215   // The compiler intrinsic for isInterface tests the
1216   // Klass::_access_flags bits in the same way.
1217   return result;
1218 JVM_END
1219 
1220 JVM_ENTRY(jboolean, JVM_IsHiddenClass(JNIEnv *env, jclass cls))
1221   oop mirror = JNIHandles::resolve_non_null(cls);
1222   if (java_lang_Class::is_primitive(mirror)) {
1223     return JNI_FALSE;
1224   }
1225   Klass* k = java_lang_Class::as_Klass(mirror);
1226   return k->is_hidden();
1227 JVM_END
1228 
1229 JVM_ENTRY(jobjectArray, JVM_GetClassSigners(JNIEnv *env, jclass cls))
1230   JvmtiVMObjectAllocEventCollector oam;
1231   oop mirror = JNIHandles::resolve_non_null(cls);
1232   if (java_lang_Class::is_primitive(mirror)) {
1233     // There are no signers for primitive types
1234     return NULL;
1235   }
1236 
1237   objArrayHandle signers(THREAD, java_lang_Class::signers(mirror));
1238 
1239   // If there are no signers set in the class, or if the class
1240   // is an array, return NULL.
1241   if (signers == NULL) return NULL;
1242 
1243   // copy of the signers array
1244   Klass* element = ObjArrayKlass::cast(signers->klass())->element_klass();
1245   objArrayOop signers_copy = oopFactory::new_objArray(element, signers->length(), CHECK_NULL);
1246   for (int index = 0; index < signers->length(); index++) {
1247     signers_copy->obj_at_put(index, signers->obj_at(index));
1248   }
1249 
1250   // return the copy
1251   return (jobjectArray) JNIHandles::make_local(THREAD, signers_copy);
1252 JVM_END
1253 
1254 
1255 JVM_ENTRY(void, JVM_SetClassSigners(JNIEnv *env, jclass cls, jobjectArray signers))
1256   oop mirror = JNIHandles::resolve_non_null(cls);
1257   if (!java_lang_Class::is_primitive(mirror)) {
1258     // This call is ignored for primitive types and arrays.
1259     // Signers are only set once, ClassLoader.java, and thus shouldn't
1260     // be called with an array.  Only the bootstrap loader creates arrays.
1261     Klass* k = java_lang_Class::as_Klass(mirror);
1262     if (k->is_instance_klass()) {
1263       java_lang_Class::set_signers(k->java_mirror(), objArrayOop(JNIHandles::resolve(signers)));
1264     }
1265   }
1266 JVM_END
1267 
1268 
1269 JVM_ENTRY(jobject, JVM_GetProtectionDomain(JNIEnv *env, jclass cls))
1270   oop mirror = JNIHandles::resolve_non_null(cls);
1271   if (mirror == NULL) {
1272     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
1273   }
1274 
1275   if (java_lang_Class::is_primitive(mirror)) {
1276     // Primitive types does not have a protection domain.
1277     return NULL;
1278   }
1279 
1280   oop pd = java_lang_Class::protection_domain(mirror);
1281   return (jobject) JNIHandles::make_local(THREAD, pd);
1282 JVM_END
1283 
1284 
1285 // Returns the inherited_access_control_context field of the running thread.
1286 JVM_ENTRY(jobject, JVM_GetInheritedAccessControlContext(JNIEnv *env, jclass cls))
1287   oop result = java_lang_Thread::inherited_access_control_context(thread->threadObj());
1288   return JNIHandles::make_local(THREAD, result);
1289 JVM_END
1290 
1291 JVM_ENTRY(jobject, JVM_GetStackAccessControlContext(JNIEnv *env, jclass cls))
1292   if (!UsePrivilegedStack) return NULL;
1293 
1294   ResourceMark rm(THREAD);
1295   GrowableArray<Handle>* local_array = new GrowableArray<Handle>(12);
1296   JvmtiVMObjectAllocEventCollector oam;
1297 
1298   // count the protection domains on the execution stack. We collapse
1299   // duplicate consecutive protection domains into a single one, as
1300   // well as stopping when we hit a privileged frame.
1301 
1302   oop previous_protection_domain = NULL;
1303   Handle privileged_context(thread, NULL);
1304   bool is_privileged = false;
1305   oop protection_domain = NULL;
1306 
1307   // Iterate through Java frames
1308   vframeStream vfst(thread);
1309   for(; !vfst.at_end(); vfst.next()) {
1310     // get method of frame
1311     Method* method = vfst.method();
1312 
1313     // stop at the first privileged frame
1314     if (method->method_holder() == vmClasses::AccessController_klass() &&
1315       method->name() == vmSymbols::executePrivileged_name())
1316     {
1317       // this frame is privileged
1318       is_privileged = true;
1319 
1320       javaVFrame *priv = vfst.asJavaVFrame();       // executePrivileged
1321 
1322       StackValueCollection* locals = priv->locals();
1323       StackValue* ctx_sv = locals->at(1); // AccessControlContext context
1324       StackValue* clr_sv = locals->at(2); // Class<?> caller
1325       assert(!ctx_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1326       assert(!clr_sv->obj_is_scalar_replaced(), "found scalar-replaced object");
1327       privileged_context    = ctx_sv->get_obj();
1328       Handle caller         = clr_sv->get_obj();
1329 
1330       Klass *caller_klass = java_lang_Class::as_Klass(caller());
1331       protection_domain  = caller_klass->protection_domain();
1332     } else {
1333       protection_domain = method->method_holder()->protection_domain();
1334     }
1335 
1336     if ((previous_protection_domain != protection_domain) && (protection_domain != NULL)) {
1337       local_array->push(Handle(thread, protection_domain));
1338       previous_protection_domain = protection_domain;
1339     }
1340 
1341     if (is_privileged) break;
1342   }
1343 
1344 
1345   // either all the domains on the stack were system domains, or
1346   // we had a privileged system domain
1347   if (local_array->is_empty()) {
1348     if (is_privileged && privileged_context.is_null()) return NULL;
1349 
1350     oop result = java_security_AccessControlContext::create(objArrayHandle(), is_privileged, privileged_context, CHECK_NULL);
1351     return JNIHandles::make_local(THREAD, result);
1352   }
1353 
1354   objArrayOop context = oopFactory::new_objArray(vmClasses::ProtectionDomain_klass(),
1355                                                  local_array->length(), CHECK_NULL);
1356   objArrayHandle h_context(thread, context);
1357   for (int index = 0; index < local_array->length(); index++) {
1358     h_context->obj_at_put(index, local_array->at(index)());
1359   }
1360 
1361   oop result = java_security_AccessControlContext::create(h_context, is_privileged, privileged_context, CHECK_NULL);
1362 
1363   return JNIHandles::make_local(THREAD, result);
1364 JVM_END
1365 
1366 
1367 JVM_ENTRY(jboolean, JVM_IsArrayClass(JNIEnv *env, jclass cls))
1368   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1369   return (k != NULL) && k->is_array_klass() ? true : false;
1370 JVM_END
1371 
1372 
1373 JVM_ENTRY(jboolean, JVM_IsPrimitiveClass(JNIEnv *env, jclass cls))
1374   oop mirror = JNIHandles::resolve_non_null(cls);
1375   return (jboolean) java_lang_Class::is_primitive(mirror);
1376 JVM_END
1377 
1378 
1379 JVM_ENTRY(jint, JVM_GetClassModifiers(JNIEnv *env, jclass cls))
1380   oop mirror = JNIHandles::resolve_non_null(cls);
1381   if (java_lang_Class::is_primitive(mirror)) {
1382     // Primitive type
1383     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1384   }
1385 
1386   Klass* k = java_lang_Class::as_Klass(mirror);
1387   debug_only(int computed_modifiers = k->compute_modifier_flags());
1388   assert(k->modifier_flags() == computed_modifiers, "modifiers cache is OK");
1389   return k->modifier_flags();
1390 JVM_END
1391 
1392 
1393 // Inner class reflection ///////////////////////////////////////////////////////////////////////////////
1394 
1395 JVM_ENTRY(jobjectArray, JVM_GetDeclaredClasses(JNIEnv *env, jclass ofClass))
1396   JvmtiVMObjectAllocEventCollector oam;
1397   // ofClass is a reference to a java_lang_Class object. The mirror object
1398   // of an InstanceKlass
1399   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1400   if (java_lang_Class::is_primitive(ofMirror) ||
1401       ! java_lang_Class::as_Klass(ofMirror)->is_instance_klass()) {
1402     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1403     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1404   }
1405 
1406   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1407   InnerClassesIterator iter(k);
1408 
1409   if (iter.length() == 0) {
1410     // Neither an inner nor outer class
1411     oop result = oopFactory::new_objArray(vmClasses::Class_klass(), 0, CHECK_NULL);
1412     return (jobjectArray)JNIHandles::make_local(THREAD, result);
1413   }
1414 
1415   // find inner class info
1416   constantPoolHandle cp(thread, k->constants());
1417   int length = iter.length();
1418 
1419   // Allocate temp. result array
1420   objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(), length/4, CHECK_NULL);
1421   objArrayHandle result (THREAD, r);
1422   int members = 0;
1423 
1424   for (; !iter.done(); iter.next()) {
1425     int ioff = iter.inner_class_info_index();
1426     int ooff = iter.outer_class_info_index();
1427 
1428     if (ioff != 0 && ooff != 0) {
1429       // Check to see if the name matches the class we're looking for
1430       // before attempting to find the class.
1431       if (cp->klass_name_at_matches(k, ooff)) {
1432         Klass* outer_klass = cp->klass_at(ooff, CHECK_NULL);
1433         if (outer_klass == k) {
1434            Klass* ik = cp->klass_at(ioff, CHECK_NULL);
1435            InstanceKlass* inner_klass = InstanceKlass::cast(ik);
1436 
1437            // Throws an exception if outer klass has not declared k as
1438            // an inner klass
1439            Reflection::check_for_inner_class(k, inner_klass, true, CHECK_NULL);
1440 
1441            result->obj_at_put(members, inner_klass->java_mirror());
1442            members++;
1443         }
1444       }
1445     }
1446   }
1447 
1448   if (members != length) {
1449     // Return array of right length
1450     objArrayOop res = oopFactory::new_objArray(vmClasses::Class_klass(), members, CHECK_NULL);
1451     for(int i = 0; i < members; i++) {
1452       res->obj_at_put(i, result->obj_at(i));
1453     }
1454     return (jobjectArray)JNIHandles::make_local(THREAD, res);
1455   }
1456 
1457   return (jobjectArray)JNIHandles::make_local(THREAD, result());
1458 JVM_END
1459 
1460 
1461 JVM_ENTRY(jclass, JVM_GetDeclaringClass(JNIEnv *env, jclass ofClass))
1462 {
1463   // ofClass is a reference to a java_lang_Class object.
1464   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1465   if (java_lang_Class::is_primitive(ofMirror)) {
1466     return NULL;
1467   }
1468   Klass* klass = java_lang_Class::as_Klass(ofMirror);
1469   if (!klass->is_instance_klass()) {
1470     return NULL;
1471   }
1472 
1473   bool inner_is_member = false;
1474   Klass* outer_klass
1475     = InstanceKlass::cast(klass)->compute_enclosing_class(&inner_is_member, CHECK_NULL);
1476   if (outer_klass == NULL)  return NULL;  // already a top-level class
1477   if (!inner_is_member)  return NULL;     // a hidden class (inside a method)
1478   return (jclass) JNIHandles::make_local(THREAD, outer_klass->java_mirror());
1479 }
1480 JVM_END
1481 
1482 JVM_ENTRY(jstring, JVM_GetSimpleBinaryName(JNIEnv *env, jclass cls))
1483 {
1484   oop mirror = JNIHandles::resolve_non_null(cls);
1485   if (java_lang_Class::is_primitive(mirror)) {
1486     return NULL;
1487   }
1488   Klass* klass = java_lang_Class::as_Klass(mirror);
1489   if (!klass->is_instance_klass()) {
1490     return NULL;
1491   }
1492   InstanceKlass* k = InstanceKlass::cast(klass);
1493   int ooff = 0, noff = 0;
1494   if (k->find_inner_classes_attr(&ooff, &noff, THREAD)) {
1495     if (noff != 0) {
1496       constantPoolHandle i_cp(thread, k->constants());
1497       Symbol* name = i_cp->symbol_at(noff);
1498       Handle str = java_lang_String::create_from_symbol(name, CHECK_NULL);
1499       return (jstring) JNIHandles::make_local(THREAD, str());
1500     }
1501   }
1502   return NULL;
1503 }
1504 JVM_END
1505 
1506 JVM_ENTRY(jstring, JVM_GetClassSignature(JNIEnv *env, jclass cls))
1507   assert (cls != NULL, "illegal class");
1508   JvmtiVMObjectAllocEventCollector oam;
1509   ResourceMark rm(THREAD);
1510   oop mirror = JNIHandles::resolve_non_null(cls);
1511   // Return null for arrays and primitives
1512   if (!java_lang_Class::is_primitive(mirror)) {
1513     Klass* k = java_lang_Class::as_Klass(mirror);
1514     if (k->is_instance_klass()) {
1515       Symbol* sym = InstanceKlass::cast(k)->generic_signature();
1516       if (sym == NULL) return NULL;
1517       Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
1518       return (jstring) JNIHandles::make_local(THREAD, str());
1519     }
1520   }
1521   return NULL;
1522 JVM_END
1523 
1524 
1525 JVM_ENTRY(jbyteArray, JVM_GetClassAnnotations(JNIEnv *env, jclass cls))
1526   assert (cls != NULL, "illegal class");
1527   oop mirror = JNIHandles::resolve_non_null(cls);
1528   // Return null for arrays and primitives
1529   if (!java_lang_Class::is_primitive(mirror)) {
1530     Klass* k = java_lang_Class::as_Klass(mirror);
1531     if (k->is_instance_klass()) {
1532       typeArrayOop a = Annotations::make_java_array(InstanceKlass::cast(k)->class_annotations(), CHECK_NULL);
1533       return (jbyteArray) JNIHandles::make_local(THREAD, a);
1534     }
1535   }
1536   return NULL;
1537 JVM_END
1538 
1539 
1540 static bool jvm_get_field_common(jobject field, fieldDescriptor& fd) {
1541   // some of this code was adapted from from jni_FromReflectedField
1542 
1543   oop reflected = JNIHandles::resolve_non_null(field);
1544   oop mirror    = java_lang_reflect_Field::clazz(reflected);
1545   Klass* k    = java_lang_Class::as_Klass(mirror);
1546   int slot      = java_lang_reflect_Field::slot(reflected);
1547   int modifiers = java_lang_reflect_Field::modifiers(reflected);
1548 
1549   InstanceKlass* ik = InstanceKlass::cast(k);
1550   intptr_t offset = ik->field_offset(slot);
1551 
1552   if (modifiers & JVM_ACC_STATIC) {
1553     // for static fields we only look in the current class
1554     if (!ik->find_local_field_from_offset(offset, true, &fd)) {
1555       assert(false, "cannot find static field");
1556       return false;
1557     }
1558   } else {
1559     // for instance fields we start with the current class and work
1560     // our way up through the superclass chain
1561     if (!ik->find_field_from_offset(offset, false, &fd)) {
1562       assert(false, "cannot find instance field");
1563       return false;
1564     }
1565   }
1566   return true;
1567 }
1568 
1569 static Method* jvm_get_method_common(jobject method) {
1570   // some of this code was adapted from from jni_FromReflectedMethod
1571 
1572   oop reflected = JNIHandles::resolve_non_null(method);
1573   oop mirror    = NULL;
1574   int slot      = 0;
1575 
1576   if (reflected->klass() == vmClasses::reflect_Constructor_klass()) {
1577     mirror = java_lang_reflect_Constructor::clazz(reflected);
1578     slot   = java_lang_reflect_Constructor::slot(reflected);
1579   } else {
1580     assert(reflected->klass() == vmClasses::reflect_Method_klass(),
1581            "wrong type");
1582     mirror = java_lang_reflect_Method::clazz(reflected);
1583     slot   = java_lang_reflect_Method::slot(reflected);
1584   }
1585   Klass* k = java_lang_Class::as_Klass(mirror);
1586 
1587   Method* m = InstanceKlass::cast(k)->method_with_idnum(slot);
1588   assert(m != NULL, "cannot find method");
1589   return m;  // caller has to deal with NULL in product mode
1590 }
1591 
1592 /* Type use annotations support (JDK 1.8) */
1593 
1594 JVM_ENTRY(jbyteArray, JVM_GetClassTypeAnnotations(JNIEnv *env, jclass cls))
1595   assert (cls != NULL, "illegal class");
1596   ResourceMark rm(THREAD);
1597   // Return null for arrays and primitives
1598   if (!java_lang_Class::is_primitive(JNIHandles::resolve(cls))) {
1599     Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
1600     if (k->is_instance_klass()) {
1601       AnnotationArray* type_annotations = InstanceKlass::cast(k)->class_type_annotations();
1602       if (type_annotations != NULL) {
1603         typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1604         return (jbyteArray) JNIHandles::make_local(THREAD, a);
1605       }
1606     }
1607   }
1608   return NULL;
1609 JVM_END
1610 
1611 JVM_ENTRY(jbyteArray, JVM_GetMethodTypeAnnotations(JNIEnv *env, jobject method))
1612   assert (method != NULL, "illegal method");
1613   // method is a handle to a java.lang.reflect.Method object
1614   Method* m = jvm_get_method_common(method);
1615   if (m == NULL) {
1616     return NULL;
1617   }
1618 
1619   AnnotationArray* type_annotations = m->type_annotations();
1620   if (type_annotations != NULL) {
1621     typeArrayOop a = Annotations::make_java_array(type_annotations, CHECK_NULL);
1622     return (jbyteArray) JNIHandles::make_local(THREAD, a);
1623   }
1624 
1625   return NULL;
1626 JVM_END
1627 
1628 JVM_ENTRY(jbyteArray, JVM_GetFieldTypeAnnotations(JNIEnv *env, jobject field))
1629   assert (field != NULL, "illegal field");
1630   fieldDescriptor fd;
1631   bool gotFd = jvm_get_field_common(field, fd);
1632   if (!gotFd) {
1633     return NULL;
1634   }
1635 
1636   return (jbyteArray) JNIHandles::make_local(THREAD, Annotations::make_java_array(fd.type_annotations(), THREAD));
1637 JVM_END
1638 
1639 static void bounds_check(const constantPoolHandle& cp, jint index, TRAPS) {
1640   if (!cp->is_within_bounds(index)) {
1641     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool index out of bounds");
1642   }
1643 }
1644 
1645 JVM_ENTRY(jobjectArray, JVM_GetMethodParameters(JNIEnv *env, jobject method))
1646 {
1647   // method is a handle to a java.lang.reflect.Method object
1648   Method* method_ptr = jvm_get_method_common(method);
1649   methodHandle mh (THREAD, method_ptr);
1650   Handle reflected_method (THREAD, JNIHandles::resolve_non_null(method));
1651   const int num_params = mh->method_parameters_length();
1652 
1653   if (num_params < 0) {
1654     // A -1 return value from method_parameters_length means there is no
1655     // parameter data.  Return null to indicate this to the reflection
1656     // API.
1657     assert(num_params == -1, "num_params should be -1 if it is less than zero");
1658     return (jobjectArray)NULL;
1659   } else {
1660     // Otherwise, we return something up to reflection, even if it is
1661     // a zero-length array.  Why?  Because in some cases this can
1662     // trigger a MalformedParametersException.
1663 
1664     // make sure all the symbols are properly formatted
1665     for (int i = 0; i < num_params; i++) {
1666       MethodParametersElement* params = mh->method_parameters_start();
1667       int index = params[i].name_cp_index;
1668       constantPoolHandle cp(THREAD, mh->constants());
1669       bounds_check(cp, index, CHECK_NULL);
1670 
1671       if (0 != index && !mh->constants()->tag_at(index).is_utf8()) {
1672         THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1673                     "Wrong type at constant pool index");
1674       }
1675 
1676     }
1677 
1678     objArrayOop result_oop = oopFactory::new_objArray(vmClasses::reflect_Parameter_klass(), num_params, CHECK_NULL);
1679     objArrayHandle result (THREAD, result_oop);
1680 
1681     for (int i = 0; i < num_params; i++) {
1682       MethodParametersElement* params = mh->method_parameters_start();
1683       // For a 0 index, give a NULL symbol
1684       Symbol* sym = 0 != params[i].name_cp_index ?
1685         mh->constants()->symbol_at(params[i].name_cp_index) : NULL;
1686       int flags = params[i].flags;
1687       oop param = Reflection::new_parameter(reflected_method, i, sym,
1688                                             flags, CHECK_NULL);
1689       result->obj_at_put(i, param);
1690     }
1691     return (jobjectArray)JNIHandles::make_local(THREAD, result());
1692   }
1693 }
1694 JVM_END
1695 
1696 // New (JDK 1.4) reflection implementation /////////////////////////////////////
1697 
1698 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredFields(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1699 {
1700   JvmtiVMObjectAllocEventCollector oam;
1701 
1702   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1703   // Exclude primitive types and array types
1704   if (java_lang_Class::is_primitive(ofMirror) ||
1705       java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1706     // Return empty array
1707     oop res = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), 0, CHECK_NULL);
1708     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1709   }
1710 
1711   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1712   constantPoolHandle cp(THREAD, k->constants());
1713 
1714   // Ensure class is linked
1715   k->link_class(CHECK_NULL);
1716 
1717   // Allocate result
1718   int num_fields;
1719 
1720   if (publicOnly) {
1721     num_fields = 0;
1722     for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1723       if (fs.access_flags().is_public()) ++num_fields;
1724     }
1725   } else {
1726     num_fields = k->java_fields_count();
1727   }
1728 
1729   objArrayOop r = oopFactory::new_objArray(vmClasses::reflect_Field_klass(), num_fields, CHECK_NULL);
1730   objArrayHandle result (THREAD, r);
1731 
1732   int out_idx = 0;
1733   fieldDescriptor fd;
1734   for (JavaFieldStream fs(k); !fs.done(); fs.next()) {
1735     if (!publicOnly || fs.access_flags().is_public()) {
1736       fd.reinitialize(k, fs.index());
1737       oop field = Reflection::new_field(&fd, CHECK_NULL);
1738       result->obj_at_put(out_idx, field);
1739       ++out_idx;
1740     }
1741   }
1742   assert(out_idx == num_fields, "just checking");
1743   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1744 }
1745 JVM_END
1746 
1747 // A class is a record if and only if it is final and a direct subclass of
1748 // java.lang.Record and has a Record attribute; otherwise, it is not a record.
1749 JVM_ENTRY(jboolean, JVM_IsRecord(JNIEnv *env, jclass cls))
1750 {
1751   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
1752   if (k != NULL && k->is_instance_klass()) {
1753     InstanceKlass* ik = InstanceKlass::cast(k);
1754     return ik->is_record();
1755   } else {
1756     return false;
1757   }
1758 }
1759 JVM_END
1760 
1761 // Returns an array containing the components of the Record attribute,
1762 // or NULL if the attribute is not present.
1763 //
1764 // Note that this function returns the components of the Record attribute
1765 // even if the class is not a record.
1766 JVM_ENTRY(jobjectArray, JVM_GetRecordComponents(JNIEnv* env, jclass ofClass))
1767 {
1768   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(ofClass));
1769   assert(c->is_instance_klass(), "must be");
1770   InstanceKlass* ik = InstanceKlass::cast(c);
1771 
1772   Array<RecordComponent*>* components = ik->record_components();
1773   if (components != NULL) {
1774     JvmtiVMObjectAllocEventCollector oam;
1775     constantPoolHandle cp(THREAD, ik->constants());
1776     int length = components->length();
1777     assert(length >= 0, "unexpected record_components length");
1778     objArrayOop record_components =
1779       oopFactory::new_objArray(vmClasses::RecordComponent_klass(), length, CHECK_NULL);
1780     objArrayHandle components_h (THREAD, record_components);
1781 
1782     for (int x = 0; x < length; x++) {
1783       RecordComponent* component = components->at(x);
1784       assert(component != NULL, "unexpected NULL record component");
1785       oop component_oop = java_lang_reflect_RecordComponent::create(ik, component, CHECK_NULL);
1786       components_h->obj_at_put(x, component_oop);
1787     }
1788     return (jobjectArray)JNIHandles::make_local(THREAD, components_h());
1789   }
1790 
1791   return NULL;
1792 }
1793 JVM_END
1794 
1795 static bool select_method(const methodHandle& method, bool want_constructor) {
1796   if (want_constructor) {
1797     return (method->is_initializer() && !method->is_static());
1798   } else {
1799     return  (!method->is_initializer() && !method->is_overpass());
1800   }
1801 }
1802 
1803 static jobjectArray get_class_declared_methods_helper(
1804                                   JNIEnv *env,
1805                                   jclass ofClass, jboolean publicOnly,
1806                                   bool want_constructor,
1807                                   Klass* klass, TRAPS) {
1808 
1809   JvmtiVMObjectAllocEventCollector oam;
1810 
1811   oop ofMirror = JNIHandles::resolve_non_null(ofClass);
1812   // Exclude primitive types and array types
1813   if (java_lang_Class::is_primitive(ofMirror)
1814       || java_lang_Class::as_Klass(ofMirror)->is_array_klass()) {
1815     // Return empty array
1816     oop res = oopFactory::new_objArray(klass, 0, CHECK_NULL);
1817     return (jobjectArray) JNIHandles::make_local(THREAD, res);
1818   }
1819 
1820   InstanceKlass* k = InstanceKlass::cast(java_lang_Class::as_Klass(ofMirror));
1821 
1822   // Ensure class is linked
1823   k->link_class(CHECK_NULL);
1824 
1825   Array<Method*>* methods = k->methods();
1826   int methods_length = methods->length();
1827 
1828   // Save original method_idnum in case of redefinition, which can change
1829   // the idnum of obsolete methods.  The new method will have the same idnum
1830   // but if we refresh the methods array, the counts will be wrong.
1831   ResourceMark rm(THREAD);
1832   GrowableArray<int>* idnums = new GrowableArray<int>(methods_length);
1833   int num_methods = 0;
1834 
1835   for (int i = 0; i < methods_length; i++) {
1836     methodHandle method(THREAD, methods->at(i));
1837     if (select_method(method, want_constructor)) {
1838       if (!publicOnly || method->is_public()) {
1839         idnums->push(method->method_idnum());
1840         ++num_methods;
1841       }
1842     }
1843   }
1844 
1845   // Allocate result
1846   objArrayOop r = oopFactory::new_objArray(klass, num_methods, CHECK_NULL);
1847   objArrayHandle result (THREAD, r);
1848 
1849   // Now just put the methods that we selected above, but go by their idnum
1850   // in case of redefinition.  The methods can be redefined at any safepoint,
1851   // so above when allocating the oop array and below when creating reflect
1852   // objects.
1853   for (int i = 0; i < num_methods; i++) {
1854     methodHandle method(THREAD, k->method_with_idnum(idnums->at(i)));
1855     if (method.is_null()) {
1856       // Method may have been deleted and seems this API can handle null
1857       // Otherwise should probably put a method that throws NSME
1858       result->obj_at_put(i, NULL);
1859     } else {
1860       oop m;
1861       if (want_constructor) {
1862         m = Reflection::new_constructor(method, CHECK_NULL);
1863       } else {
1864         m = Reflection::new_method(method, false, CHECK_NULL);
1865       }
1866       result->obj_at_put(i, m);
1867     }
1868   }
1869 
1870   return (jobjectArray) JNIHandles::make_local(THREAD, result());
1871 }
1872 
1873 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredMethods(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1874 {
1875   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1876                                            /*want_constructor*/ false,
1877                                            vmClasses::reflect_Method_klass(), THREAD);
1878 }
1879 JVM_END
1880 
1881 JVM_ENTRY(jobjectArray, JVM_GetClassDeclaredConstructors(JNIEnv *env, jclass ofClass, jboolean publicOnly))
1882 {
1883   return get_class_declared_methods_helper(env, ofClass, publicOnly,
1884                                            /*want_constructor*/ true,
1885                                            vmClasses::reflect_Constructor_klass(), THREAD);
1886 }
1887 JVM_END
1888 
1889 JVM_ENTRY(jint, JVM_GetClassAccessFlags(JNIEnv *env, jclass cls))
1890 {
1891   oop mirror = JNIHandles::resolve_non_null(cls);
1892   if (java_lang_Class::is_primitive(mirror)) {
1893     // Primitive type
1894     return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
1895   }
1896 
1897   Klass* k = java_lang_Class::as_Klass(mirror);
1898   return k->access_flags().as_int() & JVM_ACC_WRITTEN_FLAGS;
1899 }
1900 JVM_END
1901 
1902 JVM_ENTRY(jboolean, JVM_AreNestMates(JNIEnv *env, jclass current, jclass member))
1903 {
1904   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1905   assert(c->is_instance_klass(), "must be");
1906   InstanceKlass* ck = InstanceKlass::cast(c);
1907   Klass* m = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(member));
1908   assert(m->is_instance_klass(), "must be");
1909   InstanceKlass* mk = InstanceKlass::cast(m);
1910   return ck->has_nestmate_access_to(mk, THREAD);
1911 }
1912 JVM_END
1913 
1914 JVM_ENTRY(jclass, JVM_GetNestHost(JNIEnv* env, jclass current))
1915 {
1916   // current is not a primitive or array class
1917   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1918   assert(c->is_instance_klass(), "must be");
1919   InstanceKlass* ck = InstanceKlass::cast(c);
1920   InstanceKlass* host = ck->nest_host(THREAD);
1921   return (jclass) (host == NULL ? NULL :
1922                    JNIHandles::make_local(THREAD, host->java_mirror()));
1923 }
1924 JVM_END
1925 
1926 JVM_ENTRY(jobjectArray, JVM_GetNestMembers(JNIEnv* env, jclass current))
1927 {
1928   // current is not a primitive or array class
1929   ResourceMark rm(THREAD);
1930   Klass* c = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(current));
1931   assert(c->is_instance_klass(), "must be");
1932   InstanceKlass* ck = InstanceKlass::cast(c);
1933   InstanceKlass* host = ck->nest_host(THREAD);
1934 
1935   log_trace(class, nestmates)("Calling GetNestMembers for type %s with nest-host %s",
1936                               ck->external_name(), host->external_name());
1937   {
1938     JvmtiVMObjectAllocEventCollector oam;
1939     Array<u2>* members = host->nest_members();
1940     int length = members == NULL ? 0 : members->length();
1941 
1942     log_trace(class, nestmates)(" - host has %d listed nest members", length);
1943 
1944     // nest host is first in the array so make it one bigger
1945     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
1946                                              length + 1, CHECK_NULL);
1947     objArrayHandle result(THREAD, r);
1948     result->obj_at_put(0, host->java_mirror());
1949     if (length != 0) {
1950       int count = 0;
1951       for (int i = 0; i < length; i++) {
1952         int cp_index = members->at(i);
1953         Klass* k = host->constants()->klass_at(cp_index, THREAD);
1954         if (HAS_PENDING_EXCEPTION) {
1955           if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
1956             return NULL; // propagate VMEs
1957           }
1958           if (log_is_enabled(Trace, class, nestmates)) {
1959             stringStream ss;
1960             char* target_member_class = host->constants()->klass_name_at(cp_index)->as_C_string();
1961             ss.print(" - resolution of nest member %s failed: ", target_member_class);
1962             java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
1963             log_trace(class, nestmates)("%s", ss.as_string());
1964           }
1965           CLEAR_PENDING_EXCEPTION;
1966           continue;
1967         }
1968         if (k->is_instance_klass()) {
1969           InstanceKlass* ik = InstanceKlass::cast(k);
1970           InstanceKlass* nest_host_k = ik->nest_host(CHECK_NULL);
1971           if (nest_host_k == host) {
1972             result->obj_at_put(count+1, k->java_mirror());
1973             count++;
1974             log_trace(class, nestmates)(" - [%d] = %s", count, ik->external_name());
1975           } else {
1976             log_trace(class, nestmates)(" - skipping member %s with different host %s",
1977                                         ik->external_name(), nest_host_k->external_name());
1978           }
1979         } else {
1980           log_trace(class, nestmates)(" - skipping member %s that is not an instance class",
1981                                       k->external_name());
1982         }
1983       }
1984       if (count < length) {
1985         // we had invalid entries so we need to compact the array
1986         log_trace(class, nestmates)(" - compacting array from length %d to %d",
1987                                     length + 1, count + 1);
1988 
1989         objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
1990                                                   count + 1, CHECK_NULL);
1991         objArrayHandle result2(THREAD, r2);
1992         for (int i = 0; i < count + 1; i++) {
1993           result2->obj_at_put(i, result->obj_at(i));
1994         }
1995         return (jobjectArray)JNIHandles::make_local(THREAD, result2());
1996       }
1997     }
1998     else {
1999       assert(host == ck || ck->is_hidden(), "must be singleton nest or dynamic nestmate");
2000     }
2001     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2002   }
2003 }
2004 JVM_END
2005 
2006 JVM_ENTRY(jobjectArray, JVM_GetPermittedSubclasses(JNIEnv* env, jclass current))
2007 {
2008   oop mirror = JNIHandles::resolve_non_null(current);
2009   assert(!java_lang_Class::is_primitive(mirror), "should not be");
2010   Klass* c = java_lang_Class::as_Klass(mirror);
2011   assert(c->is_instance_klass(), "must be");
2012   InstanceKlass* ik = InstanceKlass::cast(c);
2013   ResourceMark rm(THREAD);
2014   log_trace(class, sealed)("Calling GetPermittedSubclasses for %s type %s",
2015                            ik->is_sealed() ? "sealed" : "non-sealed", ik->external_name());
2016   if (ik->is_sealed()) {
2017     JvmtiVMObjectAllocEventCollector oam;
2018     Array<u2>* subclasses = ik->permitted_subclasses();
2019     int length = subclasses->length();
2020 
2021     log_trace(class, sealed)(" - sealed class has %d permitted subclasses", length);
2022 
2023     objArrayOop r = oopFactory::new_objArray(vmClasses::Class_klass(),
2024                                              length, CHECK_NULL);
2025     objArrayHandle result(THREAD, r);
2026     int count = 0;
2027     for (int i = 0; i < length; i++) {
2028       int cp_index = subclasses->at(i);
2029       Klass* k = ik->constants()->klass_at(cp_index, THREAD);
2030       if (HAS_PENDING_EXCEPTION) {
2031         if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
2032           return NULL; // propagate VMEs
2033         }
2034         if (log_is_enabled(Trace, class, sealed)) {
2035           stringStream ss;
2036           char* permitted_subclass = ik->constants()->klass_name_at(cp_index)->as_C_string();
2037           ss.print(" - resolution of permitted subclass %s failed: ", permitted_subclass);
2038           java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
2039           log_trace(class, sealed)("%s", ss.as_string());
2040         }
2041 
2042         CLEAR_PENDING_EXCEPTION;
2043         continue;
2044       }
2045       if (k->is_instance_klass()) {
2046         result->obj_at_put(count++, k->java_mirror());
2047         log_trace(class, sealed)(" - [%d] = %s", count, k->external_name());
2048       }
2049     }
2050     if (count < length) {
2051       // we had invalid entries so we need to compact the array
2052       objArrayOop r2 = oopFactory::new_objArray(vmClasses::Class_klass(),
2053                                                 count, CHECK_NULL);
2054       objArrayHandle result2(THREAD, r2);
2055       for (int i = 0; i < count; i++) {
2056         result2->obj_at_put(i, result->obj_at(i));
2057       }
2058       return (jobjectArray)JNIHandles::make_local(THREAD, result2());
2059     }
2060     return (jobjectArray)JNIHandles::make_local(THREAD, result());
2061   } else {
2062     return NULL;
2063   }
2064 }
2065 JVM_END
2066 
2067 // Constant pool access //////////////////////////////////////////////////////////
2068 
2069 JVM_ENTRY(jobject, JVM_GetClassConstantPool(JNIEnv *env, jclass cls))
2070 {
2071   JvmtiVMObjectAllocEventCollector oam;
2072   oop mirror = JNIHandles::resolve_non_null(cls);
2073   // Return null for primitives and arrays
2074   if (!java_lang_Class::is_primitive(mirror)) {
2075     Klass* k = java_lang_Class::as_Klass(mirror);
2076     if (k->is_instance_klass()) {
2077       InstanceKlass* k_h = InstanceKlass::cast(k);
2078       Handle jcp = reflect_ConstantPool::create(CHECK_NULL);
2079       reflect_ConstantPool::set_cp(jcp(), k_h->constants());
2080       return JNIHandles::make_local(THREAD, jcp());
2081     }
2082   }
2083   return NULL;
2084 }
2085 JVM_END
2086 
2087 
2088 JVM_ENTRY(jint, JVM_ConstantPoolGetSize(JNIEnv *env, jobject obj, jobject unused))
2089 {
2090   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2091   return cp->length();
2092 }
2093 JVM_END
2094 
2095 
2096 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2097 {
2098   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2099   bounds_check(cp, index, CHECK_NULL);
2100   constantTag tag = cp->tag_at(index);
2101   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2102     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2103   }
2104   Klass* k = cp->klass_at(index, CHECK_NULL);
2105   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2106 }
2107 JVM_END
2108 
2109 JVM_ENTRY(jclass, JVM_ConstantPoolGetClassAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2110 {
2111   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2112   bounds_check(cp, index, CHECK_NULL);
2113   constantTag tag = cp->tag_at(index);
2114   if (!tag.is_klass() && !tag.is_unresolved_klass()) {
2115     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2116   }
2117   Klass* k = ConstantPool::klass_at_if_loaded(cp, index);
2118   if (k == NULL) return NULL;
2119   return (jclass) JNIHandles::make_local(THREAD, k->java_mirror());
2120 }
2121 JVM_END
2122 
2123 static jobject get_method_at_helper(const constantPoolHandle& cp, jint index, bool force_resolution, TRAPS) {
2124   constantTag tag = cp->tag_at(index);
2125   if (!tag.is_method() && !tag.is_interface_method()) {
2126     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2127   }
2128   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2129   Klass* k_o;
2130   if (force_resolution) {
2131     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2132   } else {
2133     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2134     if (k_o == NULL) return NULL;
2135   }
2136   InstanceKlass* k = InstanceKlass::cast(k_o);
2137   Symbol* name = cp->uncached_name_ref_at(index);
2138   Symbol* sig  = cp->uncached_signature_ref_at(index);
2139   methodHandle m (THREAD, k->find_method(name, sig));
2140   if (m.is_null()) {
2141     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up method in target class");
2142   }
2143   oop method;
2144   if (!m->is_initializer() || m->is_static()) {
2145     method = Reflection::new_method(m, true, CHECK_NULL);
2146   } else {
2147     method = Reflection::new_constructor(m, CHECK_NULL);
2148   }
2149   return JNIHandles::make_local(THREAD, method);
2150 }
2151 
2152 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2153 {
2154   JvmtiVMObjectAllocEventCollector oam;
2155   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2156   bounds_check(cp, index, CHECK_NULL);
2157   jobject res = get_method_at_helper(cp, index, true, CHECK_NULL);
2158   return res;
2159 }
2160 JVM_END
2161 
2162 JVM_ENTRY(jobject, JVM_ConstantPoolGetMethodAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2163 {
2164   JvmtiVMObjectAllocEventCollector oam;
2165   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2166   bounds_check(cp, index, CHECK_NULL);
2167   jobject res = get_method_at_helper(cp, index, false, CHECK_NULL);
2168   return res;
2169 }
2170 JVM_END
2171 
2172 static jobject get_field_at_helper(constantPoolHandle cp, jint index, bool force_resolution, TRAPS) {
2173   constantTag tag = cp->tag_at(index);
2174   if (!tag.is_field()) {
2175     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2176   }
2177   int klass_ref  = cp->uncached_klass_ref_index_at(index);
2178   Klass* k_o;
2179   if (force_resolution) {
2180     k_o = cp->klass_at(klass_ref, CHECK_NULL);
2181   } else {
2182     k_o = ConstantPool::klass_at_if_loaded(cp, klass_ref);
2183     if (k_o == NULL) return NULL;
2184   }
2185   InstanceKlass* k = InstanceKlass::cast(k_o);
2186   Symbol* name = cp->uncached_name_ref_at(index);
2187   Symbol* sig  = cp->uncached_signature_ref_at(index);
2188   fieldDescriptor fd;
2189   Klass* target_klass = k->find_field(name, sig, &fd);
2190   if (target_klass == NULL) {
2191     THROW_MSG_0(vmSymbols::java_lang_RuntimeException(), "Unable to look up field in target class");
2192   }
2193   oop field = Reflection::new_field(&fd, CHECK_NULL);
2194   return JNIHandles::make_local(THREAD, field);
2195 }
2196 
2197 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAt(JNIEnv *env, jobject obj, jobject unusedl, 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_field_at_helper(cp, index, true, CHECK_NULL);
2203   return res;
2204 }
2205 JVM_END
2206 
2207 JVM_ENTRY(jobject, JVM_ConstantPoolGetFieldAtIfLoaded(JNIEnv *env, jobject obj, jobject unused, jint index))
2208 {
2209   JvmtiVMObjectAllocEventCollector oam;
2210   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2211   bounds_check(cp, index, CHECK_NULL);
2212   jobject res = get_field_at_helper(cp, index, false, CHECK_NULL);
2213   return res;
2214 }
2215 JVM_END
2216 
2217 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetMemberRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2218 {
2219   JvmtiVMObjectAllocEventCollector oam;
2220   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2221   bounds_check(cp, index, CHECK_NULL);
2222   constantTag tag = cp->tag_at(index);
2223   if (!tag.is_field_or_method()) {
2224     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2225   }
2226   int klass_ref = cp->uncached_klass_ref_index_at(index);
2227   Symbol*  klass_name  = cp->klass_name_at(klass_ref);
2228   Symbol*  member_name = cp->uncached_name_ref_at(index);
2229   Symbol*  member_sig  = cp->uncached_signature_ref_at(index);
2230   objArrayOop  dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 3, CHECK_NULL);
2231   objArrayHandle dest(THREAD, dest_o);
2232   Handle str = java_lang_String::create_from_symbol(klass_name, CHECK_NULL);
2233   dest->obj_at_put(0, str());
2234   str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2235   dest->obj_at_put(1, str());
2236   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2237   dest->obj_at_put(2, str());
2238   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2239 }
2240 JVM_END
2241 
2242 JVM_ENTRY(jint, JVM_ConstantPoolGetClassRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2243 {
2244   JvmtiVMObjectAllocEventCollector oam;
2245   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2246   bounds_check(cp, index, CHECK_0);
2247   constantTag tag = cp->tag_at(index);
2248   if (!tag.is_field_or_method()) {
2249     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2250   }
2251   return (jint) cp->uncached_klass_ref_index_at(index);
2252 }
2253 JVM_END
2254 
2255 JVM_ENTRY(jint, JVM_ConstantPoolGetNameAndTypeRefIndexAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2256 {
2257   JvmtiVMObjectAllocEventCollector oam;
2258   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2259   bounds_check(cp, index, CHECK_0);
2260   constantTag tag = cp->tag_at(index);
2261   if (!tag.is_invoke_dynamic() && !tag.is_field_or_method()) {
2262     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2263   }
2264   return (jint) cp->uncached_name_and_type_ref_index_at(index);
2265 }
2266 JVM_END
2267 
2268 JVM_ENTRY(jobjectArray, JVM_ConstantPoolGetNameAndTypeRefInfoAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2269 {
2270   JvmtiVMObjectAllocEventCollector oam;
2271   constantPoolHandle cp(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2272   bounds_check(cp, index, CHECK_NULL);
2273   constantTag tag = cp->tag_at(index);
2274   if (!tag.is_name_and_type()) {
2275     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2276   }
2277   Symbol* member_name = cp->symbol_at(cp->name_ref_index_at(index));
2278   Symbol* member_sig = cp->symbol_at(cp->signature_ref_index_at(index));
2279   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::String_klass(), 2, CHECK_NULL);
2280   objArrayHandle dest(THREAD, dest_o);
2281   Handle str = java_lang_String::create_from_symbol(member_name, CHECK_NULL);
2282   dest->obj_at_put(0, str());
2283   str = java_lang_String::create_from_symbol(member_sig, CHECK_NULL);
2284   dest->obj_at_put(1, str());
2285   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
2286 }
2287 JVM_END
2288 
2289 JVM_ENTRY(jint, JVM_ConstantPoolGetIntAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2290 {
2291   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2292   bounds_check(cp, index, CHECK_0);
2293   constantTag tag = cp->tag_at(index);
2294   if (!tag.is_int()) {
2295     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2296   }
2297   return cp->int_at(index);
2298 }
2299 JVM_END
2300 
2301 JVM_ENTRY(jlong, JVM_ConstantPoolGetLongAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2302 {
2303   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2304   bounds_check(cp, index, CHECK_(0L));
2305   constantTag tag = cp->tag_at(index);
2306   if (!tag.is_long()) {
2307     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2308   }
2309   return cp->long_at(index);
2310 }
2311 JVM_END
2312 
2313 JVM_ENTRY(jfloat, JVM_ConstantPoolGetFloatAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2314 {
2315   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2316   bounds_check(cp, index, CHECK_(0.0f));
2317   constantTag tag = cp->tag_at(index);
2318   if (!tag.is_float()) {
2319     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2320   }
2321   return cp->float_at(index);
2322 }
2323 JVM_END
2324 
2325 JVM_ENTRY(jdouble, JVM_ConstantPoolGetDoubleAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2326 {
2327   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2328   bounds_check(cp, index, CHECK_(0.0));
2329   constantTag tag = cp->tag_at(index);
2330   if (!tag.is_double()) {
2331     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2332   }
2333   return cp->double_at(index);
2334 }
2335 JVM_END
2336 
2337 JVM_ENTRY(jstring, JVM_ConstantPoolGetStringAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2338 {
2339   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2340   bounds_check(cp, index, CHECK_NULL);
2341   constantTag tag = cp->tag_at(index);
2342   if (!tag.is_string()) {
2343     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2344   }
2345   oop str = cp->string_at(index, CHECK_NULL);
2346   return (jstring) JNIHandles::make_local(THREAD, str);
2347 }
2348 JVM_END
2349 
2350 JVM_ENTRY(jstring, JVM_ConstantPoolGetUTF8At(JNIEnv *env, jobject obj, jobject unused, jint index))
2351 {
2352   JvmtiVMObjectAllocEventCollector oam;
2353   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2354   bounds_check(cp, index, CHECK_NULL);
2355   constantTag tag = cp->tag_at(index);
2356   if (!tag.is_symbol()) {
2357     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Wrong type at constant pool index");
2358   }
2359   Symbol* sym = cp->symbol_at(index);
2360   Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
2361   return (jstring) JNIHandles::make_local(THREAD, str());
2362 }
2363 JVM_END
2364 
2365 JVM_ENTRY(jbyte, JVM_ConstantPoolGetTagAt(JNIEnv *env, jobject obj, jobject unused, jint index))
2366 {
2367   constantPoolHandle cp = constantPoolHandle(THREAD, reflect_ConstantPool::get_cp(JNIHandles::resolve_non_null(obj)));
2368   bounds_check(cp, index, CHECK_0);
2369   constantTag tag = cp->tag_at(index);
2370   jbyte result = tag.value();
2371   // If returned tag values are not from the JVM spec, e.g. tags from 100 to 105,
2372   // they are changed to the corresponding tags from the JVM spec, so that java code in
2373   // sun.reflect.ConstantPool will return only tags from the JVM spec, not internal ones.
2374   if (tag.is_klass_or_reference()) {
2375       result = JVM_CONSTANT_Class;
2376   } else if (tag.is_string_index()) {
2377       result = JVM_CONSTANT_String;
2378   } else if (tag.is_method_type_in_error()) {
2379       result = JVM_CONSTANT_MethodType;
2380   } else if (tag.is_method_handle_in_error()) {
2381       result = JVM_CONSTANT_MethodHandle;
2382   } else if (tag.is_dynamic_constant_in_error()) {
2383       result = JVM_CONSTANT_Dynamic;
2384   }
2385   return result;
2386 }
2387 JVM_END
2388 
2389 // Assertion support. //////////////////////////////////////////////////////////
2390 
2391 JVM_ENTRY(jboolean, JVM_DesiredAssertionStatus(JNIEnv *env, jclass unused, jclass cls))
2392   assert(cls != NULL, "bad class");
2393 
2394   oop r = JNIHandles::resolve(cls);
2395   assert(! java_lang_Class::is_primitive(r), "primitive classes not allowed");
2396   if (java_lang_Class::is_primitive(r)) return false;
2397 
2398   Klass* k = java_lang_Class::as_Klass(r);
2399   assert(k->is_instance_klass(), "must be an instance klass");
2400   if (!k->is_instance_klass()) return false;
2401 
2402   ResourceMark rm(THREAD);
2403   const char* name = k->name()->as_C_string();
2404   bool system_class = k->class_loader() == NULL;
2405   return JavaAssertions::enabled(name, system_class);
2406 
2407 JVM_END
2408 
2409 
2410 // Return a new AssertionStatusDirectives object with the fields filled in with
2411 // command-line assertion arguments (i.e., -ea, -da).
2412 JVM_ENTRY(jobject, JVM_AssertionStatusDirectives(JNIEnv *env, jclass unused))
2413   JvmtiVMObjectAllocEventCollector oam;
2414   oop asd = JavaAssertions::createAssertionStatusDirectives(CHECK_NULL);
2415   return JNIHandles::make_local(THREAD, asd);
2416 JVM_END
2417 
2418 // Verification ////////////////////////////////////////////////////////////////////////////////
2419 
2420 // Reflection for the verifier /////////////////////////////////////////////////////////////////
2421 
2422 // RedefineClasses support: bug 6214132 caused verification to fail.
2423 // All functions from this section should call the jvmtiThreadSate function:
2424 //   Klass* class_to_verify_considering_redefinition(Klass* klass).
2425 // The function returns a Klass* of the _scratch_class if the verifier
2426 // was invoked in the middle of the class redefinition.
2427 // Otherwise it returns its argument value which is the _the_class Klass*.
2428 // Please, refer to the description in the jvmtiThreadSate.hpp.
2429 
2430 JVM_ENTRY(const char*, JVM_GetClassNameUTF(JNIEnv *env, jclass cls))
2431   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2432   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2433   return k->name()->as_utf8();
2434 JVM_END
2435 
2436 
2437 JVM_ENTRY(void, JVM_GetClassCPTypes(JNIEnv *env, jclass cls, unsigned char *types))
2438   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2439   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2440   // types will have length zero if this is not an InstanceKlass
2441   // (length is determined by call to JVM_GetClassCPEntriesCount)
2442   if (k->is_instance_klass()) {
2443     ConstantPool* cp = InstanceKlass::cast(k)->constants();
2444     for (int index = cp->length() - 1; index >= 0; index--) {
2445       constantTag tag = cp->tag_at(index);
2446       types[index] = (tag.is_unresolved_klass()) ? (unsigned char) JVM_CONSTANT_Class : tag.value();
2447     }
2448   }
2449 JVM_END
2450 
2451 
2452 JVM_ENTRY(jint, JVM_GetClassCPEntriesCount(JNIEnv *env, jclass cls))
2453   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2454   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2455   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->constants()->length();
2456 JVM_END
2457 
2458 
2459 JVM_ENTRY(jint, JVM_GetClassFieldsCount(JNIEnv *env, jclass cls))
2460   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2461   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2462   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->java_fields_count();
2463 JVM_END
2464 
2465 
2466 JVM_ENTRY(jint, JVM_GetClassMethodsCount(JNIEnv *env, jclass cls))
2467   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2468   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2469   return (!k->is_instance_klass()) ? 0 : InstanceKlass::cast(k)->methods()->length();
2470 JVM_END
2471 
2472 
2473 // The following methods, used for the verifier, are never called with
2474 // array klasses, so a direct cast to InstanceKlass is safe.
2475 // Typically, these methods are called in a loop with bounds determined
2476 // by the results of JVM_GetClass{Fields,Methods}Count, which return
2477 // zero for arrays.
2478 JVM_ENTRY(void, JVM_GetMethodIxExceptionIndexes(JNIEnv *env, jclass cls, jint method_index, unsigned short *exceptions))
2479   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2480   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2481   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2482   int length = method->checked_exceptions_length();
2483   if (length > 0) {
2484     CheckedExceptionElement* table= method->checked_exceptions_start();
2485     for (int i = 0; i < length; i++) {
2486       exceptions[i] = table[i].class_cp_index;
2487     }
2488   }
2489 JVM_END
2490 
2491 
2492 JVM_ENTRY(jint, JVM_GetMethodIxExceptionsCount(JNIEnv *env, jclass cls, jint method_index))
2493   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2494   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2495   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2496   return method->checked_exceptions_length();
2497 JVM_END
2498 
2499 
2500 JVM_ENTRY(void, JVM_GetMethodIxByteCode(JNIEnv *env, jclass cls, jint method_index, unsigned char *code))
2501   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2502   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2503   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2504   memcpy(code, method->code_base(), method->code_size());
2505 JVM_END
2506 
2507 
2508 JVM_ENTRY(jint, JVM_GetMethodIxByteCodeLength(JNIEnv *env, jclass cls, jint method_index))
2509   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2510   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2511   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2512   return method->code_size();
2513 JVM_END
2514 
2515 
2516 JVM_ENTRY(void, JVM_GetMethodIxExceptionTableEntry(JNIEnv *env, jclass cls, jint method_index, jint entry_index, JVM_ExceptionTableEntryType *entry))
2517   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2518   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2519   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2520   ExceptionTable extable(method);
2521   entry->start_pc   = extable.start_pc(entry_index);
2522   entry->end_pc     = extable.end_pc(entry_index);
2523   entry->handler_pc = extable.handler_pc(entry_index);
2524   entry->catchType  = extable.catch_type_index(entry_index);
2525 JVM_END
2526 
2527 
2528 JVM_ENTRY(jint, JVM_GetMethodIxExceptionTableLength(JNIEnv *env, jclass cls, int method_index))
2529   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2530   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2531   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2532   return method->exception_table_length();
2533 JVM_END
2534 
2535 
2536 JVM_ENTRY(jint, JVM_GetMethodIxModifiers(JNIEnv *env, jclass cls, int method_index))
2537   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2538   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2539   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2540   return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2541 JVM_END
2542 
2543 
2544 JVM_ENTRY(jint, JVM_GetFieldIxModifiers(JNIEnv *env, jclass cls, int field_index))
2545   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2546   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2547   return InstanceKlass::cast(k)->field_access_flags(field_index) & JVM_RECOGNIZED_FIELD_MODIFIERS;
2548 JVM_END
2549 
2550 
2551 JVM_ENTRY(jint, JVM_GetMethodIxLocalsCount(JNIEnv *env, jclass cls, int method_index))
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   return method->max_locals();
2556 JVM_END
2557 
2558 
2559 JVM_ENTRY(jint, JVM_GetMethodIxArgsSize(JNIEnv *env, jclass cls, int method_index))
2560   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2561   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2562   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2563   return method->size_of_parameters();
2564 JVM_END
2565 
2566 
2567 JVM_ENTRY(jint, JVM_GetMethodIxMaxStack(JNIEnv *env, jclass cls, int method_index))
2568   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2569   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2570   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2571   return method->verifier_max_stack();
2572 JVM_END
2573 
2574 
2575 JVM_ENTRY(jboolean, JVM_IsConstructorIx(JNIEnv *env, jclass cls, int method_index))
2576   ResourceMark rm(THREAD);
2577   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2578   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2579   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2580   return method->name() == vmSymbols::object_initializer_name();
2581 JVM_END
2582 
2583 
2584 JVM_ENTRY(jboolean, JVM_IsVMGeneratedMethodIx(JNIEnv *env, jclass cls, int method_index))
2585   ResourceMark rm(THREAD);
2586   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2587   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2588   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2589   return method->is_overpass();
2590 JVM_END
2591 
2592 JVM_ENTRY(const char*, JVM_GetMethodIxNameUTF(JNIEnv *env, jclass cls, jint method_index))
2593   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2594   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2595   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2596   return method->name()->as_utf8();
2597 JVM_END
2598 
2599 
2600 JVM_ENTRY(const char*, JVM_GetMethodIxSignatureUTF(JNIEnv *env, jclass cls, jint method_index))
2601   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2602   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2603   Method* method = InstanceKlass::cast(k)->methods()->at(method_index);
2604   return method->signature()->as_utf8();
2605 JVM_END
2606 
2607 /**
2608  * All of these JVM_GetCP-xxx methods are used by the old verifier to
2609  * read entries in the constant pool.  Since the old verifier always
2610  * works on a copy of the code, it will not see any rewriting that
2611  * may possibly occur in the middle of verification.  So it is important
2612  * that nothing it calls tries to use the cpCache instead of the raw
2613  * constant pool, so we must use cp->uncached_x methods when appropriate.
2614  */
2615 JVM_ENTRY(const char*, JVM_GetCPFieldNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2616   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2617   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2618   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2619   switch (cp->tag_at(cp_index).value()) {
2620     case JVM_CONSTANT_Fieldref:
2621       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2622     default:
2623       fatal("JVM_GetCPFieldNameUTF: illegal constant");
2624   }
2625   ShouldNotReachHere();
2626   return NULL;
2627 JVM_END
2628 
2629 
2630 JVM_ENTRY(const char*, JVM_GetCPMethodNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2631   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2632   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2633   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2634   switch (cp->tag_at(cp_index).value()) {
2635     case JVM_CONSTANT_InterfaceMethodref:
2636     case JVM_CONSTANT_Methodref:
2637       return cp->uncached_name_ref_at(cp_index)->as_utf8();
2638     default:
2639       fatal("JVM_GetCPMethodNameUTF: illegal constant");
2640   }
2641   ShouldNotReachHere();
2642   return NULL;
2643 JVM_END
2644 
2645 
2646 JVM_ENTRY(const char*, JVM_GetCPMethodSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2647   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2648   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2649   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2650   switch (cp->tag_at(cp_index).value()) {
2651     case JVM_CONSTANT_InterfaceMethodref:
2652     case JVM_CONSTANT_Methodref:
2653       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2654     default:
2655       fatal("JVM_GetCPMethodSignatureUTF: illegal constant");
2656   }
2657   ShouldNotReachHere();
2658   return NULL;
2659 JVM_END
2660 
2661 
2662 JVM_ENTRY(const char*, JVM_GetCPFieldSignatureUTF(JNIEnv *env, jclass cls, jint cp_index))
2663   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2664   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2665   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2666   switch (cp->tag_at(cp_index).value()) {
2667     case JVM_CONSTANT_Fieldref:
2668       return cp->uncached_signature_ref_at(cp_index)->as_utf8();
2669     default:
2670       fatal("JVM_GetCPFieldSignatureUTF: illegal constant");
2671   }
2672   ShouldNotReachHere();
2673   return NULL;
2674 JVM_END
2675 
2676 
2677 JVM_ENTRY(const char*, JVM_GetCPClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2678   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2679   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2680   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2681   Symbol* classname = cp->klass_name_at(cp_index);
2682   return classname->as_utf8();
2683 JVM_END
2684 
2685 
2686 JVM_ENTRY(const char*, JVM_GetCPFieldClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2687   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2688   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2689   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2690   switch (cp->tag_at(cp_index).value()) {
2691     case JVM_CONSTANT_Fieldref: {
2692       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2693       Symbol* classname = cp->klass_name_at(class_index);
2694       return classname->as_utf8();
2695     }
2696     default:
2697       fatal("JVM_GetCPFieldClassNameUTF: illegal constant");
2698   }
2699   ShouldNotReachHere();
2700   return NULL;
2701 JVM_END
2702 
2703 
2704 JVM_ENTRY(const char*, JVM_GetCPMethodClassNameUTF(JNIEnv *env, jclass cls, jint cp_index))
2705   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2706   k = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2707   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2708   switch (cp->tag_at(cp_index).value()) {
2709     case JVM_CONSTANT_Methodref:
2710     case JVM_CONSTANT_InterfaceMethodref: {
2711       int class_index = cp->uncached_klass_ref_index_at(cp_index);
2712       Symbol* classname = cp->klass_name_at(class_index);
2713       return classname->as_utf8();
2714     }
2715     default:
2716       fatal("JVM_GetCPMethodClassNameUTF: illegal constant");
2717   }
2718   ShouldNotReachHere();
2719   return NULL;
2720 JVM_END
2721 
2722 
2723 JVM_ENTRY(jint, JVM_GetCPFieldModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2724   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2725   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2726   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2727   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2728   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2729   ConstantPool* cp_called = InstanceKlass::cast(k_called)->constants();
2730   switch (cp->tag_at(cp_index).value()) {
2731     case JVM_CONSTANT_Fieldref: {
2732       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2733       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2734       InstanceKlass* ik = InstanceKlass::cast(k_called);
2735       for (JavaFieldStream fs(ik); !fs.done(); fs.next()) {
2736         if (fs.name() == name && fs.signature() == signature) {
2737           return fs.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS;
2738         }
2739       }
2740       return -1;
2741     }
2742     default:
2743       fatal("JVM_GetCPFieldModifiers: illegal constant");
2744   }
2745   ShouldNotReachHere();
2746   return 0;
2747 JVM_END
2748 
2749 
2750 JVM_ENTRY(jint, JVM_GetCPMethodModifiers(JNIEnv *env, jclass cls, int cp_index, jclass called_cls))
2751   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(cls));
2752   Klass* k_called = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(called_cls));
2753   k        = JvmtiThreadState::class_to_verify_considering_redefinition(k, thread);
2754   k_called = JvmtiThreadState::class_to_verify_considering_redefinition(k_called, thread);
2755   ConstantPool* cp = InstanceKlass::cast(k)->constants();
2756   switch (cp->tag_at(cp_index).value()) {
2757     case JVM_CONSTANT_Methodref:
2758     case JVM_CONSTANT_InterfaceMethodref: {
2759       Symbol* name      = cp->uncached_name_ref_at(cp_index);
2760       Symbol* signature = cp->uncached_signature_ref_at(cp_index);
2761       Array<Method*>* methods = InstanceKlass::cast(k_called)->methods();
2762       int methods_count = methods->length();
2763       for (int i = 0; i < methods_count; i++) {
2764         Method* method = methods->at(i);
2765         if (method->name() == name && method->signature() == signature) {
2766             return method->access_flags().as_int() & JVM_RECOGNIZED_METHOD_MODIFIERS;
2767         }
2768       }
2769       return -1;
2770     }
2771     default:
2772       fatal("JVM_GetCPMethodModifiers: illegal constant");
2773   }
2774   ShouldNotReachHere();
2775   return 0;
2776 JVM_END
2777 
2778 
2779 // Misc //////////////////////////////////////////////////////////////////////////////////////////////
2780 
2781 JVM_LEAF(void, JVM_ReleaseUTF(const char *utf))
2782   // So long as UTF8::convert_to_utf8 returns resource strings, we don't have to do anything
2783 JVM_END
2784 
2785 
2786 JVM_ENTRY(jboolean, JVM_IsSameClassPackage(JNIEnv *env, jclass class1, jclass class2))
2787   oop class1_mirror = JNIHandles::resolve_non_null(class1);
2788   oop class2_mirror = JNIHandles::resolve_non_null(class2);
2789   Klass* klass1 = java_lang_Class::as_Klass(class1_mirror);
2790   Klass* klass2 = java_lang_Class::as_Klass(class2_mirror);
2791   return (jboolean) Reflection::is_same_class_package(klass1, klass2);
2792 JVM_END
2793 
2794 // Printing support //////////////////////////////////////////////////
2795 extern "C" {
2796 
2797 ATTRIBUTE_PRINTF(3, 0)
2798 int jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args) {
2799   // Reject count values that are negative signed values converted to
2800   // unsigned; see bug 4399518, 4417214
2801   if ((intptr_t)count <= 0) return -1;
2802 
2803   int result = os::vsnprintf(str, count, fmt, args);
2804   if (result > 0 && (size_t)result >= count) {
2805     result = -1;
2806   }
2807 
2808   return result;
2809 }
2810 
2811 ATTRIBUTE_PRINTF(3, 4)
2812 int jio_snprintf(char *str, size_t count, const char *fmt, ...) {
2813   va_list args;
2814   int len;
2815   va_start(args, fmt);
2816   len = jio_vsnprintf(str, count, fmt, args);
2817   va_end(args);
2818   return len;
2819 }
2820 
2821 ATTRIBUTE_PRINTF(2, 3)
2822 int jio_fprintf(FILE* f, const char *fmt, ...) {
2823   int len;
2824   va_list args;
2825   va_start(args, fmt);
2826   len = jio_vfprintf(f, fmt, args);
2827   va_end(args);
2828   return len;
2829 }
2830 
2831 ATTRIBUTE_PRINTF(2, 0)
2832 int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
2833   if (Arguments::vfprintf_hook() != NULL) {
2834      return Arguments::vfprintf_hook()(f, fmt, args);
2835   } else {
2836     return vfprintf(f, fmt, args);
2837   }
2838 }
2839 
2840 ATTRIBUTE_PRINTF(1, 2)
2841 JNIEXPORT int jio_printf(const char *fmt, ...) {
2842   int len;
2843   va_list args;
2844   va_start(args, fmt);
2845   len = jio_vfprintf(defaultStream::output_stream(), fmt, args);
2846   va_end(args);
2847   return len;
2848 }
2849 
2850 // HotSpot specific jio method
2851 void jio_print(const char* s, size_t len) {
2852   // Try to make this function as atomic as possible.
2853   if (Arguments::vfprintf_hook() != NULL) {
2854     jio_fprintf(defaultStream::output_stream(), "%.*s", (int)len, s);
2855   } else {
2856     // Make an unused local variable to avoid warning from gcc compiler.
2857     ssize_t count = os::write(defaultStream::output_fd(), s, (int)len);
2858   }
2859 }
2860 
2861 } // Extern C
2862 
2863 // java.lang.Thread //////////////////////////////////////////////////////////////////////////////
2864 
2865 // In most of the JVM thread support functions we need to access the
2866 // thread through a ThreadsListHandle to prevent it from exiting and
2867 // being reclaimed while we try to operate on it. The exceptions to this
2868 // rule are when operating on the current thread, or if the monitor of
2869 // the target java.lang.Thread is locked at the Java level - in both
2870 // cases the target cannot exit.
2871 
2872 static void thread_entry(JavaThread* thread, TRAPS) {
2873   HandleMark hm(THREAD);
2874   Handle obj(THREAD, thread->threadObj());
2875   JavaValue result(T_VOID);
2876   JavaCalls::call_virtual(&result,
2877                           obj,
2878                           vmClasses::Thread_klass(),
2879                           vmSymbols::run_method_name(),
2880                           vmSymbols::void_method_signature(),
2881                           THREAD);
2882 }
2883 
2884 
2885 JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
2886 #if INCLUDE_CDS
2887   if (DumpSharedSpaces) {
2888     // During java -Xshare:dump, if we allow multiple Java threads to
2889     // execute in parallel, symbols and classes may be loaded in
2890     // random orders which will make the resulting CDS archive
2891     // non-deterministic.
2892     //
2893     // Lucikly, during java -Xshare:dump, it's important to run only
2894     // the code in the main Java thread (which is NOT started here) that
2895     // creates the module graph, etc. It's safe to not start the other
2896     // threads which are launched by class static initializers
2897     // (ReferenceHandler, FinalizerThread and CleanerImpl).
2898     if (log_is_enabled(Info, cds)) {
2899       ResourceMark rm;
2900       oop t = JNIHandles::resolve_non_null(jthread);
2901       log_info(cds)("JVM_StartThread() ignored: %s", t->klass()->external_name());
2902     }
2903     return;
2904   }
2905 #endif
2906   JavaThread *native_thread = NULL;
2907 
2908   // We cannot hold the Threads_lock when we throw an exception,
2909   // due to rank ordering issues. Example:  we might need to grab the
2910   // Heap_lock while we construct the exception.
2911   bool throw_illegal_thread_state = false;
2912 
2913   // We must release the Threads_lock before we can post a jvmti event
2914   // in Thread::start.
2915   {
2916     // Ensure that the C++ Thread and OSThread structures aren't freed before
2917     // we operate.
2918     MutexLocker mu(Threads_lock);
2919 
2920     // Since JDK 5 the java.lang.Thread threadStatus is used to prevent
2921     // re-starting an already started thread, so we should usually find
2922     // that the JavaThread is null. However for a JNI attached thread
2923     // there is a small window between the Thread object being created
2924     // (with its JavaThread set) and the update to its threadStatus, so we
2925     // have to check for this
2926     if (java_lang_Thread::thread(JNIHandles::resolve_non_null(jthread)) != NULL) {
2927       throw_illegal_thread_state = true;
2928     } else {
2929       // We could also check the stillborn flag to see if this thread was already stopped, but
2930       // for historical reasons we let the thread detect that itself when it starts running
2931 
2932       jlong size =
2933              java_lang_Thread::stackSize(JNIHandles::resolve_non_null(jthread));
2934       // Allocate the C++ Thread structure and create the native thread.  The
2935       // stack size retrieved from java is 64-bit signed, but the constructor takes
2936       // size_t (an unsigned type), which may be 32 or 64-bit depending on the platform.
2937       //  - Avoid truncating on 32-bit platforms if size is greater than UINT_MAX.
2938       //  - Avoid passing negative values which would result in really large stacks.
2939       NOT_LP64(if (size > SIZE_MAX) size = SIZE_MAX;)
2940       size_t sz = size > 0 ? (size_t) size : 0;
2941       native_thread = new JavaThread(&thread_entry, sz);
2942 
2943       // At this point it may be possible that no osthread was created for the
2944       // JavaThread due to lack of memory. Check for this situation and throw
2945       // an exception if necessary. Eventually we may want to change this so
2946       // that we only grab the lock if the thread was created successfully -
2947       // then we can also do this check and throw the exception in the
2948       // JavaThread constructor.
2949       if (native_thread->osthread() != NULL) {
2950         // Note: the current thread is not being used within "prepare".
2951         native_thread->prepare(jthread);
2952       }
2953     }
2954   }
2955 
2956   if (throw_illegal_thread_state) {
2957     THROW(vmSymbols::java_lang_IllegalThreadStateException());
2958   }
2959 
2960   assert(native_thread != NULL, "Starting null thread?");
2961 
2962   if (native_thread->osthread() == NULL) {
2963     ResourceMark rm(thread);
2964     log_warning(os, thread)("Failed to start the native thread for java.lang.Thread \"%s\"",
2965                             JavaThread::name_for(JNIHandles::resolve_non_null(jthread)));
2966     // No one should hold a reference to the 'native_thread'.
2967     native_thread->smr_delete();
2968     if (JvmtiExport::should_post_resource_exhausted()) {
2969       JvmtiExport::post_resource_exhausted(
2970         JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR | JVMTI_RESOURCE_EXHAUSTED_THREADS,
2971         os::native_thread_creation_failed_msg());
2972     }
2973     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(),
2974               os::native_thread_creation_failed_msg());
2975   }
2976 
2977   JFR_ONLY(Jfr::on_java_thread_start(thread, native_thread);)
2978 
2979   Thread::start(native_thread);
2980 
2981 JVM_END
2982 
2983 
2984 // JVM_Stop is implemented using a VM_Operation, so threads are forced to safepoints
2985 // before the quasi-asynchronous exception is delivered.  This is a little obtrusive,
2986 // but is thought to be reliable and simple. In the case, where the receiver is the
2987 // same thread as the sender, no VM_Operation is needed.
2988 JVM_ENTRY(void, JVM_StopThread(JNIEnv* env, jobject jthread, jobject throwable))
2989   ThreadsListHandle tlh(thread);
2990   oop java_throwable = JNIHandles::resolve(throwable);
2991   if (java_throwable == NULL) {
2992     THROW(vmSymbols::java_lang_NullPointerException());
2993   }
2994   oop java_thread = NULL;
2995   JavaThread* receiver = NULL;
2996   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
2997   Events::log_exception(thread,
2998                         "JVM_StopThread thread JavaThread " INTPTR_FORMAT " as oop " INTPTR_FORMAT " [exception " INTPTR_FORMAT "]",
2999                         p2i(receiver), p2i(java_thread), p2i(throwable));
3000 
3001   if (is_alive) {
3002     // jthread refers to a live JavaThread.
3003     if (thread == receiver) {
3004       // Exception is getting thrown at self so no VM_Operation needed.
3005       THROW_OOP(java_throwable);
3006     } else {
3007       // Use a VM_Operation to throw the exception.
3008       JavaThread::send_async_exception(receiver, java_throwable);
3009     }
3010   } else {
3011     // Either:
3012     // - target thread has not been started before being stopped, or
3013     // - target thread already terminated
3014     // We could read the threadStatus to determine which case it is
3015     // but that is overkill as it doesn't matter. We must set the
3016     // stillborn flag for the first case, and if the thread has already
3017     // exited setting this flag has no effect.
3018     java_lang_Thread::set_stillborn(java_thread);
3019   }
3020 JVM_END
3021 
3022 
3023 JVM_ENTRY(jboolean, JVM_IsThreadAlive(JNIEnv* env, jobject jthread))
3024   oop thread_oop = JNIHandles::resolve_non_null(jthread);
3025   return java_lang_Thread::is_alive(thread_oop);
3026 JVM_END
3027 
3028 
3029 JVM_ENTRY(void, JVM_SuspendThread(JNIEnv* env, jobject jthread))
3030   ThreadsListHandle tlh(thread);
3031   JavaThread* receiver = NULL;
3032   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3033   if (is_alive) {
3034     // jthread refers to a live JavaThread, but java_suspend() will
3035     // detect a thread that has started to exit and will ignore it.
3036     receiver->java_suspend();
3037   }
3038 JVM_END
3039 
3040 
3041 JVM_ENTRY(void, JVM_ResumeThread(JNIEnv* env, jobject jthread))
3042   ThreadsListHandle tlh(thread);
3043   JavaThread* receiver = NULL;
3044   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3045   if (is_alive) {
3046     // jthread refers to a live JavaThread.
3047     receiver->java_resume();
3048   }
3049 JVM_END
3050 
3051 
3052 JVM_ENTRY(void, JVM_SetThreadPriority(JNIEnv* env, jobject jthread, jint prio))
3053   ThreadsListHandle tlh(thread);
3054   oop java_thread = NULL;
3055   JavaThread* receiver = NULL;
3056   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, &java_thread);
3057   java_lang_Thread::set_priority(java_thread, (ThreadPriority)prio);
3058 
3059   if (is_alive) {
3060     // jthread refers to a live JavaThread.
3061     Thread::set_priority(receiver, (ThreadPriority)prio);
3062   }
3063   // Implied else: If the JavaThread hasn't started yet, then the
3064   // priority set in the java.lang.Thread object above will be pushed
3065   // down when it does start.
3066 JVM_END
3067 
3068 
3069 JVM_LEAF(void, JVM_Yield(JNIEnv *env, jclass threadClass))
3070   if (os::dont_yield()) return;
3071   HOTSPOT_THREAD_YIELD();
3072   os::naked_yield();
3073 JVM_END
3074 
3075 JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
3076   if (millis < 0) {
3077     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "timeout value is negative");
3078   }
3079 
3080   if (thread->is_interrupted(true) && !HAS_PENDING_EXCEPTION) {
3081     THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3082   }
3083 
3084   // Save current thread state and restore it at the end of this block.
3085   // And set new thread state to SLEEPING.
3086   JavaThreadSleepState jtss(thread);
3087 
3088   HOTSPOT_THREAD_SLEEP_BEGIN(millis);
3089 
3090   if (millis == 0) {
3091     os::naked_yield();
3092   } else {
3093     ThreadState old_state = thread->osthread()->get_state();
3094     thread->osthread()->set_state(SLEEPING);
3095     if (!thread->sleep(millis)) { // interrupted
3096       // An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
3097       // us while we were sleeping. We do not overwrite those.
3098       if (!HAS_PENDING_EXCEPTION) {
3099         HOTSPOT_THREAD_SLEEP_END(1);
3100 
3101         // TODO-FIXME: THROW_MSG returns which means we will not call set_state()
3102         // to properly restore the thread state.  That's likely wrong.
3103         THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
3104       }
3105     }
3106     thread->osthread()->set_state(old_state);
3107   }
3108   HOTSPOT_THREAD_SLEEP_END(0);
3109 JVM_END
3110 
3111 JVM_ENTRY(jobject, JVM_CurrentCarrierThread(JNIEnv* env, jclass threadClass))
3112   oop jthread = thread->threadObj();
3113   assert(jthread != NULL, "no current carrier thread!");
3114   return JNIHandles::make_local(THREAD, jthread);
3115 JVM_END
3116 
3117 JVM_ENTRY(jobject, JVM_CurrentThread(JNIEnv* env, jclass threadClass))
3118   oop theThread = thread->vthread();
3119   assert(theThread != (oop)NULL, "no current thread!");
3120   return JNIHandles::make_local(THREAD, theThread);
3121 JVM_END
3122 
3123 JVM_ENTRY(void, JVM_SetCurrentThread(JNIEnv* env, jobject thisThread,
3124                                      jobject theThread))
3125   oop threadObj = JNIHandles::resolve(theThread);
3126   thread->set_vthread(threadObj);
3127   JFR_ONLY(Jfr::on_set_current_thread(thread, threadObj);)
3128 JVM_END
3129 
3130 JVM_ENTRY(jlong, JVM_GetNextThreadIdOffset(JNIEnv* env, jclass threadClass))
3131   return ThreadIdentifier::unsafe_offset();
3132 JVM_END
3133 
3134 JVM_ENTRY(void, JVM_Interrupt(JNIEnv* env, jobject jthread))
3135   ThreadsListHandle tlh(thread);
3136   JavaThread* receiver = NULL;
3137   bool is_alive = tlh.cv_internal_thread_to_JavaThread(jthread, &receiver, NULL);
3138   if (is_alive) {
3139     // jthread refers to a live JavaThread.
3140     receiver->interrupt();
3141   }
3142 JVM_END
3143 
3144 // Return true iff the current thread has locked the object passed in
3145 
3146 JVM_ENTRY(jboolean, JVM_HoldsLock(JNIEnv* env, jclass threadClass, jobject obj))
3147   if (obj == NULL) {
3148     THROW_(vmSymbols::java_lang_NullPointerException(), JNI_FALSE);
3149   }
3150   Handle h_obj(THREAD, JNIHandles::resolve(obj));
3151   return ObjectSynchronizer::current_thread_holds_lock(thread, h_obj);
3152 JVM_END
3153 
3154 JVM_ENTRY(jobject, JVM_GetStackTrace(JNIEnv *env, jobject jthread))
3155   oop trace = java_lang_Thread::async_get_stack_trace(JNIHandles::resolve(jthread), THREAD);
3156   return JNIHandles::make_local(THREAD, trace);
3157 JVM_END
3158 
3159 JVM_ENTRY(void, JVM_DumpAllStacks(JNIEnv* env, jclass))
3160   VM_PrintThreads op;
3161   VMThread::execute(&op);
3162   if (JvmtiExport::should_post_data_dump()) {
3163     JvmtiExport::post_data_dump();
3164   }
3165 JVM_END
3166 
3167 JVM_ENTRY(void, JVM_SetNativeThreadName(JNIEnv* env, jobject jthread, jstring name))
3168   // We don't use a ThreadsListHandle here because the current thread
3169   // must be alive.
3170   oop java_thread = JNIHandles::resolve_non_null(jthread);
3171   JavaThread* thr = java_lang_Thread::thread(java_thread);
3172   if (thread == thr && !thr->has_attached_via_jni()) {
3173     // Thread naming is only supported for the current thread and
3174     // we don't set the name of an attached thread to avoid stepping
3175     // on other programs.
3176     ResourceMark rm(thread);
3177     const char *thread_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3178     os::set_native_thread_name(thread_name);
3179   }
3180 JVM_END
3181 
3182 JVM_ENTRY(jobject, JVM_ExtentLocalCache(JNIEnv* env, jclass threadClass))
3183   oop theCache = thread->extentLocalCache();
3184   if (theCache) {
3185     arrayOop objs = arrayOop(theCache);
3186     assert(objs->length() == ExtentLocalCacheSize * 2, "wrong length");
3187   }
3188   return JNIHandles::make_local(THREAD, theCache);
3189 JVM_END
3190 
3191 JVM_ENTRY(void, JVM_SetExtentLocalCache(JNIEnv* env, jclass threadClass,
3192                                        jobject theCache))
3193   arrayOop objs = arrayOop(JNIHandles::resolve(theCache));
3194   if (objs != NULL) {
3195     assert(objs->length() == ExtentLocalCacheSize * 2, "wrong length");
3196   }
3197   thread->set_extentLocalCache(objs);
3198 JVM_END
3199 
3200 // java.lang.SecurityManager ///////////////////////////////////////////////////////////////////////
3201 
3202 JVM_ENTRY(jobjectArray, JVM_GetClassContext(JNIEnv *env))
3203   ResourceMark rm(THREAD);
3204   JvmtiVMObjectAllocEventCollector oam;
3205   vframeStream vfst(thread);
3206 
3207   if (vmClasses::reflect_CallerSensitive_klass() != NULL) {
3208     // This must only be called from SecurityManager.getClassContext
3209     Method* m = vfst.method();
3210     if (!(m->method_holder() == vmClasses::SecurityManager_klass() &&
3211           m->name()          == vmSymbols::getClassContext_name() &&
3212           m->signature()     == vmSymbols::void_class_array_signature())) {
3213       THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "JVM_GetClassContext must only be called from SecurityManager.getClassContext");
3214     }
3215   }
3216 
3217   // Collect method holders
3218   GrowableArray<Klass*>* klass_array = new GrowableArray<Klass*>();
3219   for (; !vfst.at_end(); vfst.security_next()) {
3220     Method* m = vfst.method();
3221     // Native frames are not returned
3222     if (!m->is_ignored_by_security_stack_walk() && !m->is_native()) {
3223       Klass* holder = m->method_holder();
3224       assert(holder->is_klass(), "just checking");
3225       klass_array->append(holder);
3226     }
3227   }
3228 
3229   // Create result array of type [Ljava/lang/Class;
3230   objArrayOop result = oopFactory::new_objArray(vmClasses::Class_klass(), klass_array->length(), CHECK_NULL);
3231   // Fill in mirrors corresponding to method holders
3232   for (int i = 0; i < klass_array->length(); i++) {
3233     result->obj_at_put(i, klass_array->at(i)->java_mirror());
3234   }
3235 
3236   return (jobjectArray) JNIHandles::make_local(THREAD, result);
3237 JVM_END
3238 
3239 
3240 // java.lang.Package ////////////////////////////////////////////////////////////////
3241 
3242 
3243 JVM_ENTRY(jstring, JVM_GetSystemPackage(JNIEnv *env, jstring name))
3244   ResourceMark rm(THREAD);
3245   JvmtiVMObjectAllocEventCollector oam;
3246   char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
3247   oop result = ClassLoader::get_system_package(str, CHECK_NULL);
3248 return (jstring) JNIHandles::make_local(THREAD, result);
3249 JVM_END
3250 
3251 
3252 JVM_ENTRY(jobjectArray, JVM_GetSystemPackages(JNIEnv *env))
3253   JvmtiVMObjectAllocEventCollector oam;
3254   objArrayOop result = ClassLoader::get_system_packages(CHECK_NULL);
3255   return (jobjectArray) JNIHandles::make_local(THREAD, result);
3256 JVM_END
3257 
3258 
3259 // java.lang.ref.Reference ///////////////////////////////////////////////////////////////
3260 
3261 
3262 JVM_ENTRY(jobject, JVM_GetAndClearReferencePendingList(JNIEnv* env))
3263   MonitorLocker ml(Heap_lock);
3264   oop ref = Universe::reference_pending_list();
3265   if (ref != NULL) {
3266     Universe::clear_reference_pending_list();
3267   }
3268   return JNIHandles::make_local(THREAD, ref);
3269 JVM_END
3270 
3271 JVM_ENTRY(jboolean, JVM_HasReferencePendingList(JNIEnv* env))
3272   MonitorLocker ml(Heap_lock);
3273   return Universe::has_reference_pending_list();
3274 JVM_END
3275 
3276 JVM_ENTRY(void, JVM_WaitForReferencePendingList(JNIEnv* env))
3277   MonitorLocker ml(Heap_lock);
3278   while (!Universe::has_reference_pending_list()) {
3279     ml.wait();
3280   }
3281 JVM_END
3282 
3283 JVM_ENTRY(jboolean, JVM_ReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3284   oop ref_oop = JNIHandles::resolve_non_null(ref);
3285   oop referent = java_lang_ref_Reference::weak_referent_no_keepalive(ref_oop);
3286   return referent == JNIHandles::resolve(o);
3287 JVM_END
3288 
3289 JVM_ENTRY(void, JVM_ReferenceClear(JNIEnv* env, jobject ref))
3290   oop ref_oop = JNIHandles::resolve_non_null(ref);
3291   // FinalReference has it's own implementation of clear().
3292   assert(!java_lang_ref_Reference::is_final(ref_oop), "precondition");
3293   if (java_lang_ref_Reference::unknown_referent_no_keepalive(ref_oop) == NULL) {
3294     // If the referent has already been cleared then done.
3295     // However, if the referent is dead but has not yet been cleared by
3296     // concurrent reference processing, it should NOT be cleared here.
3297     // Instead, clearing should be left to the GC.  Clearing it here could
3298     // detectably lose an expected notification, which is impossible with
3299     // STW reference processing.  The clearing in enqueue() doesn't have
3300     // this problem, since the enqueue covers the notification, but it's not
3301     // worth the effort to handle that case specially.
3302     return;
3303   }
3304   java_lang_ref_Reference::clear_referent(ref_oop);
3305 JVM_END
3306 
3307 
3308 // java.lang.ref.PhantomReference //////////////////////////////////////////////////
3309 
3310 
3311 JVM_ENTRY(jboolean, JVM_PhantomReferenceRefersTo(JNIEnv* env, jobject ref, jobject o))
3312   oop ref_oop = JNIHandles::resolve_non_null(ref);
3313   oop referent = java_lang_ref_Reference::phantom_referent_no_keepalive(ref_oop);
3314   return referent == JNIHandles::resolve(o);
3315 JVM_END
3316 
3317 
3318 // ObjectInputStream ///////////////////////////////////////////////////////////////
3319 
3320 // Return the first user-defined class loader up the execution stack, or null
3321 // if only code from the bootstrap or platform class loader is on the stack.
3322 
3323 JVM_ENTRY(jobject, JVM_LatestUserDefinedLoader(JNIEnv *env))
3324   for (vframeStream vfst(thread); !vfst.at_end(); vfst.next()) {
3325     InstanceKlass* ik = vfst.method()->method_holder();
3326     oop loader = ik->class_loader();
3327     if (loader != NULL && !SystemDictionary::is_platform_class_loader(loader)) {
3328       // Skip reflection related frames
3329       if (!ik->is_subclass_of(vmClasses::reflect_MethodAccessorImpl_klass()) &&
3330           !ik->is_subclass_of(vmClasses::reflect_ConstructorAccessorImpl_klass())) {
3331         return JNIHandles::make_local(THREAD, loader);
3332       }
3333     }
3334   }
3335   return NULL;
3336 JVM_END
3337 
3338 
3339 // Array ///////////////////////////////////////////////////////////////////////////////////////////
3340 
3341 
3342 // resolve array handle and check arguments
3343 static inline arrayOop check_array(JNIEnv *env, jobject arr, bool type_array_only, TRAPS) {
3344   if (arr == NULL) {
3345     THROW_0(vmSymbols::java_lang_NullPointerException());
3346   }
3347   oop a = JNIHandles::resolve_non_null(arr);
3348   if (!a->is_array()) {
3349     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array");
3350   } else if (type_array_only && !a->is_typeArray()) {
3351     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Argument is not an array of primitive type");
3352   }
3353   return arrayOop(a);
3354 }
3355 
3356 
3357 JVM_ENTRY(jint, JVM_GetArrayLength(JNIEnv *env, jobject arr))
3358   arrayOop a = check_array(env, arr, false, CHECK_0);
3359   return a->length();
3360 JVM_END
3361 
3362 
3363 JVM_ENTRY(jobject, JVM_GetArrayElement(JNIEnv *env, jobject arr, jint index))
3364   JvmtiVMObjectAllocEventCollector oam;
3365   arrayOop a = check_array(env, arr, false, CHECK_NULL);
3366   jvalue value;
3367   BasicType type = Reflection::array_get(&value, a, index, CHECK_NULL);
3368   oop box = Reflection::box(&value, type, CHECK_NULL);
3369   return JNIHandles::make_local(THREAD, box);
3370 JVM_END
3371 
3372 
3373 JVM_ENTRY(jvalue, JVM_GetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jint wCode))
3374   jvalue value;
3375   value.i = 0; // to initialize value before getting used in CHECK
3376   arrayOop a = check_array(env, arr, true, CHECK_(value));
3377   assert(a->is_typeArray(), "just checking");
3378   BasicType type = Reflection::array_get(&value, a, index, CHECK_(value));
3379   BasicType wide_type = (BasicType) wCode;
3380   if (type != wide_type) {
3381     Reflection::widen(&value, type, wide_type, CHECK_(value));
3382   }
3383   return value;
3384 JVM_END
3385 
3386 
3387 JVM_ENTRY(void, JVM_SetArrayElement(JNIEnv *env, jobject arr, jint index, jobject val))
3388   arrayOop a = check_array(env, arr, false, CHECK);
3389   oop box = JNIHandles::resolve(val);
3390   jvalue value;
3391   value.i = 0; // to initialize value before getting used in CHECK
3392   BasicType value_type;
3393   if (a->is_objArray()) {
3394     // Make sure we do no unbox e.g. java/lang/Integer instances when storing into an object array
3395     value_type = Reflection::unbox_for_regular_object(box, &value);
3396   } else {
3397     value_type = Reflection::unbox_for_primitive(box, &value, CHECK);
3398   }
3399   Reflection::array_set(&value, a, index, value_type, CHECK);
3400 JVM_END
3401 
3402 
3403 JVM_ENTRY(void, JVM_SetPrimitiveArrayElement(JNIEnv *env, jobject arr, jint index, jvalue v, unsigned char vCode))
3404   arrayOop a = check_array(env, arr, true, CHECK);
3405   assert(a->is_typeArray(), "just checking");
3406   BasicType value_type = (BasicType) vCode;
3407   Reflection::array_set(&v, a, index, value_type, CHECK);
3408 JVM_END
3409 
3410 
3411 JVM_ENTRY(jobject, JVM_NewArray(JNIEnv *env, jclass eltClass, jint length))
3412   JvmtiVMObjectAllocEventCollector oam;
3413   oop element_mirror = JNIHandles::resolve(eltClass);
3414   oop result = Reflection::reflect_new_array(element_mirror, length, CHECK_NULL);
3415   return JNIHandles::make_local(THREAD, result);
3416 JVM_END
3417 
3418 
3419 JVM_ENTRY(jobject, JVM_NewMultiArray(JNIEnv *env, jclass eltClass, jintArray dim))
3420   JvmtiVMObjectAllocEventCollector oam;
3421   arrayOop dim_array = check_array(env, dim, true, CHECK_NULL);
3422   oop element_mirror = JNIHandles::resolve(eltClass);
3423   assert(dim_array->is_typeArray(), "just checking");
3424   oop result = Reflection::reflect_new_multi_array(element_mirror, typeArrayOop(dim_array), CHECK_NULL);
3425   return JNIHandles::make_local(THREAD, result);
3426 JVM_END
3427 
3428 
3429 // Library support ///////////////////////////////////////////////////////////////////////////
3430 
3431 JVM_LEAF(void*, JVM_LoadZipLibrary())
3432   ClassLoader::load_zip_library_if_needed();
3433   return ClassLoader::zip_library_handle();
3434 JVM_END
3435 
3436 JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))
3437   //%note jvm_ct
3438   char ebuf[1024];
3439   void *load_result;
3440   {
3441     ThreadToNativeFromVM ttnfvm(thread);
3442     load_result = os::dll_load(name, ebuf, sizeof ebuf);
3443   }
3444   if (load_result == NULL) {
3445     if (throwException) {
3446       char msg[1024];
3447       jio_snprintf(msg, sizeof msg, "%s: %s", name, ebuf);
3448       // Since 'ebuf' may contain a string encoded using
3449       // platform encoding scheme, we need to pass
3450       // Exceptions::unsafe_to_utf8 to the new_exception method
3451       // as the last argument. See bug 6367357.
3452       Handle h_exception =
3453         Exceptions::new_exception(thread,
3454                                   vmSymbols::java_lang_UnsatisfiedLinkError(),
3455                                   msg, Exceptions::unsafe_to_utf8);
3456 
3457       THROW_HANDLE_0(h_exception);
3458     } else {
3459       log_info(library)("Failed to load library %s", name);
3460       return load_result;
3461     }
3462   }
3463   log_info(library)("Loaded library %s, handle " INTPTR_FORMAT, name, p2i(load_result));
3464   return load_result;
3465 JVM_END
3466 
3467 
3468 JVM_LEAF(void, JVM_UnloadLibrary(void* handle))
3469   os::dll_unload(handle);
3470   log_info(library)("Unloaded library with handle " INTPTR_FORMAT, p2i(handle));
3471 JVM_END
3472 
3473 
3474 JVM_LEAF(void*, JVM_FindLibraryEntry(void* handle, const char* name))
3475   void* find_result = os::dll_lookup(handle, name);
3476   log_info(library)("%s %s in library with handle " INTPTR_FORMAT,
3477                     find_result != NULL ? "Found" : "Failed to find",
3478                     name, p2i(handle));
3479   return find_result;
3480 JVM_END
3481 
3482 
3483 // JNI version ///////////////////////////////////////////////////////////////////////////////
3484 
3485 JVM_LEAF(jboolean, JVM_IsSupportedJNIVersion(jint version))
3486   return Threads::is_supported_jni_version_including_1_1(version);
3487 JVM_END
3488 
3489 
3490 JVM_LEAF(jboolean, JVM_IsPreviewEnabled(void))
3491   return Arguments::enable_preview() ? JNI_TRUE : JNI_FALSE;
3492 JVM_END
3493 
3494 JVM_LEAF(jboolean, JVM_IsContinuationsSupported(void))
3495   return VMContinuations ? JNI_TRUE : JNI_FALSE;
3496 JVM_END
3497 
3498 // String support ///////////////////////////////////////////////////////////////////////////
3499 
3500 JVM_ENTRY(jstring, JVM_InternString(JNIEnv *env, jstring str))
3501   JvmtiVMObjectAllocEventCollector oam;
3502   if (str == NULL) return NULL;
3503   oop string = JNIHandles::resolve_non_null(str);
3504   oop result = StringTable::intern(string, CHECK_NULL);
3505   return (jstring) JNIHandles::make_local(THREAD, result);
3506 JVM_END
3507 
3508 
3509 // VM Raw monitor support //////////////////////////////////////////////////////////////////////
3510 
3511 // VM Raw monitors (not to be confused with JvmtiRawMonitors) are a simple mutual exclusion
3512 // lock (not actually monitors: no wait/notify) that is exported by the VM for use by JDK
3513 // library code. They may be used by JavaThreads and non-JavaThreads and do not participate
3514 // in the safepoint protocol, thread suspension, thread interruption, or anything of that
3515 // nature. JavaThreads will be "in native" when using this API from JDK code.
3516 
3517 
3518 JNIEXPORT void* JNICALL JVM_RawMonitorCreate(void) {
3519   VM_Exit::block_if_vm_exited();
3520   return new os::PlatformMutex();
3521 }
3522 
3523 
3524 JNIEXPORT void JNICALL  JVM_RawMonitorDestroy(void *mon) {
3525   VM_Exit::block_if_vm_exited();
3526   delete ((os::PlatformMutex*) mon);
3527 }
3528 
3529 
3530 JNIEXPORT jint JNICALL JVM_RawMonitorEnter(void *mon) {
3531   VM_Exit::block_if_vm_exited();
3532   ((os::PlatformMutex*) mon)->lock();
3533   return 0;
3534 }
3535 
3536 
3537 JNIEXPORT void JNICALL JVM_RawMonitorExit(void *mon) {
3538   VM_Exit::block_if_vm_exited();
3539   ((os::PlatformMutex*) mon)->unlock();
3540 }
3541 
3542 
3543 // Shared JNI/JVM entry points //////////////////////////////////////////////////////////////
3544 
3545 jclass find_class_from_class_loader(JNIEnv* env, Symbol* name, jboolean init,
3546                                     Handle loader, Handle protection_domain,
3547                                     jboolean throwError, TRAPS) {
3548   // Security Note:
3549   //   The Java level wrapper will perform the necessary security check allowing
3550   //   us to pass the NULL as the initiating class loader.  The VM is responsible for
3551   //   the checkPackageAccess relative to the initiating class loader via the
3552   //   protection_domain. The protection_domain is passed as NULL by the java code
3553   //   if there is no security manager in 3-arg Class.forName().
3554   Klass* klass = SystemDictionary::resolve_or_fail(name, loader, protection_domain, throwError != 0, CHECK_NULL);
3555 
3556   // Check if we should initialize the class
3557   if (init && klass->is_instance_klass()) {
3558     klass->initialize(CHECK_NULL);
3559   }
3560   return (jclass) JNIHandles::make_local(THREAD, klass->java_mirror());
3561 }
3562 
3563 
3564 // Method ///////////////////////////////////////////////////////////////////////////////////////////
3565 
3566 JVM_ENTRY(jobject, JVM_InvokeMethod(JNIEnv *env, jobject method, jobject obj, jobjectArray args0))
3567   Handle method_handle;
3568   if (thread->stack_overflow_state()->stack_available((address) &method_handle) >= JVMInvokeMethodSlack) {
3569     method_handle = Handle(THREAD, JNIHandles::resolve(method));
3570     Handle receiver(THREAD, JNIHandles::resolve(obj));
3571     objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3572     oop result = Reflection::invoke_method(method_handle(), receiver, args, CHECK_NULL);
3573     jobject res = JNIHandles::make_local(THREAD, result);
3574     if (JvmtiExport::should_post_vm_object_alloc()) {
3575       oop ret_type = java_lang_reflect_Method::return_type(method_handle());
3576       assert(ret_type != NULL, "sanity check: ret_type oop must not be NULL!");
3577       if (java_lang_Class::is_primitive(ret_type)) {
3578         // Only for primitive type vm allocates memory for java object.
3579         // See box() method.
3580         JvmtiExport::post_vm_object_alloc(thread, result);
3581       }
3582     }
3583     return res;
3584   } else {
3585     THROW_0(vmSymbols::java_lang_StackOverflowError());
3586   }
3587 JVM_END
3588 
3589 
3590 JVM_ENTRY(jobject, JVM_NewInstanceFromConstructor(JNIEnv *env, jobject c, jobjectArray args0))
3591   oop constructor_mirror = JNIHandles::resolve(c);
3592   objArrayHandle args(THREAD, objArrayOop(JNIHandles::resolve(args0)));
3593   oop result = Reflection::invoke_constructor(constructor_mirror, args, CHECK_NULL);
3594   jobject res = JNIHandles::make_local(THREAD, result);
3595   if (JvmtiExport::should_post_vm_object_alloc()) {
3596     JvmtiExport::post_vm_object_alloc(thread, result);
3597   }
3598   return res;
3599 JVM_END
3600 
3601 // Atomic ///////////////////////////////////////////////////////////////////////////////////////////
3602 
3603 JVM_LEAF(jboolean, JVM_SupportsCX8())
3604   return VM_Version::supports_cx8();
3605 JVM_END
3606 
3607 JVM_ENTRY(void, JVM_InitializeFromArchive(JNIEnv* env, jclass cls))
3608   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(cls));
3609   assert(k->is_klass(), "just checking");
3610   HeapShared::initialize_from_archived_subgraph(k, THREAD);
3611 JVM_END
3612 
3613 JVM_ENTRY(void, JVM_RegisterLambdaProxyClassForArchiving(JNIEnv* env,
3614                                               jclass caller,
3615                                               jstring interfaceMethodName,
3616                                               jobject factoryType,
3617                                               jobject interfaceMethodType,
3618                                               jobject implementationMember,
3619                                               jobject dynamicMethodType,
3620                                               jclass lambdaProxyClass))
3621 #if INCLUDE_CDS
3622   if (!Arguments::is_dumping_archive()) {
3623     return;
3624   }
3625 
3626   Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3627   InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3628   if (caller_ik->is_hidden()) {
3629     // Hidden classes not of type lambda proxy classes are currently not being archived.
3630     // If the caller_ik is of one of the above types, the corresponding lambda proxy class won't be
3631     // registered for archiving.
3632     return;
3633   }
3634   Klass* lambda_k = java_lang_Class::as_Klass(JNIHandles::resolve(lambdaProxyClass));
3635   InstanceKlass* lambda_ik = InstanceKlass::cast(lambda_k);
3636   assert(lambda_ik->is_hidden(), "must be a hidden class");
3637   assert(!lambda_ik->is_non_strong_hidden(), "expected a strong hidden class");
3638 
3639   Symbol* interface_method_name = NULL;
3640   if (interfaceMethodName != NULL) {
3641     interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3642   }
3643   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3644   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3645 
3646   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3647   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3648 
3649   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3650   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3651   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3652 
3653   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3654   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3655 
3656   SystemDictionaryShared::add_lambda_proxy_class(caller_ik, lambda_ik, interface_method_name, factory_type,
3657                                                  interface_method_type, m, dynamic_method_type, THREAD);
3658 #endif // INCLUDE_CDS
3659 JVM_END
3660 
3661 JVM_ENTRY(jclass, JVM_LookupLambdaProxyClassFromArchive(JNIEnv* env,
3662                                                         jclass caller,
3663                                                         jstring interfaceMethodName,
3664                                                         jobject factoryType,
3665                                                         jobject interfaceMethodType,
3666                                                         jobject implementationMember,
3667                                                         jobject dynamicMethodType))
3668 #if INCLUDE_CDS
3669 
3670   if (interfaceMethodName == NULL || factoryType == NULL || interfaceMethodType == NULL ||
3671       implementationMember == NULL || dynamicMethodType == NULL) {
3672     THROW_(vmSymbols::java_lang_NullPointerException(), NULL);
3673   }
3674 
3675   Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller));
3676   InstanceKlass* caller_ik = InstanceKlass::cast(caller_k);
3677   if (!caller_ik->is_shared()) {
3678     // there won't be a shared lambda class if the caller_ik is not in the shared archive.
3679     return NULL;
3680   }
3681 
3682   Symbol* interface_method_name = java_lang_String::as_symbol(JNIHandles::resolve_non_null(interfaceMethodName));
3683   Handle factory_type_oop(THREAD, JNIHandles::resolve_non_null(factoryType));
3684   Symbol* factory_type = java_lang_invoke_MethodType::as_signature(factory_type_oop(), true);
3685 
3686   Handle interface_method_type_oop(THREAD, JNIHandles::resolve_non_null(interfaceMethodType));
3687   Symbol* interface_method_type = java_lang_invoke_MethodType::as_signature(interface_method_type_oop(), true);
3688 
3689   Handle implementation_member_oop(THREAD, JNIHandles::resolve_non_null(implementationMember));
3690   assert(java_lang_invoke_MemberName::is_method(implementation_member_oop()), "must be");
3691   Method* m = java_lang_invoke_MemberName::vmtarget(implementation_member_oop());
3692 
3693   Handle dynamic_method_type_oop(THREAD, JNIHandles::resolve_non_null(dynamicMethodType));
3694   Symbol* dynamic_method_type = java_lang_invoke_MethodType::as_signature(dynamic_method_type_oop(), true);
3695 
3696   InstanceKlass* lambda_ik = SystemDictionaryShared::get_shared_lambda_proxy_class(caller_ik, interface_method_name, factory_type,
3697                                                                                    interface_method_type, m, dynamic_method_type);
3698   jclass jcls = NULL;
3699   if (lambda_ik != NULL) {
3700     InstanceKlass* loaded_lambda = SystemDictionaryShared::prepare_shared_lambda_proxy_class(lambda_ik, caller_ik, THREAD);
3701     jcls = loaded_lambda == NULL ? NULL : (jclass) JNIHandles::make_local(THREAD, loaded_lambda->java_mirror());
3702   }
3703   return jcls;
3704 #else
3705   return NULL;
3706 #endif // INCLUDE_CDS
3707 JVM_END
3708 
3709 JVM_LEAF(jboolean, JVM_IsCDSDumpingEnabled(JNIEnv* env))
3710   return Arguments::is_dumping_archive();
3711 JVM_END
3712 
3713 JVM_LEAF(jboolean, JVM_IsSharingEnabled(JNIEnv* env))
3714   return UseSharedSpaces;
3715 JVM_END
3716 
3717 JVM_ENTRY_NO_ENV(jlong, JVM_GetRandomSeedForDumping())
3718   if (DumpSharedSpaces) {
3719     const char* release = VM_Version::vm_release();
3720     const char* dbg_level = VM_Version::jdk_debug_level();
3721     const char* version = VM_Version::internal_vm_info_string();
3722     jlong seed = (jlong)(java_lang_String::hash_code((const jbyte*)release, (int)strlen(release)) ^
3723                          java_lang_String::hash_code((const jbyte*)dbg_level, (int)strlen(dbg_level)) ^
3724                          java_lang_String::hash_code((const jbyte*)version, (int)strlen(version)));
3725     seed += (jlong)VM_Version::vm_major_version();
3726     seed += (jlong)VM_Version::vm_minor_version();
3727     seed += (jlong)VM_Version::vm_security_version();
3728     seed += (jlong)VM_Version::vm_patch_version();
3729     if (seed == 0) { // don't let this ever be zero.
3730       seed = 0x87654321;
3731     }
3732     log_debug(cds)("JVM_GetRandomSeedForDumping() = " JLONG_FORMAT, seed);
3733     return seed;
3734   } else {
3735     return 0;
3736   }
3737 JVM_END
3738 
3739 JVM_LEAF(jboolean, JVM_IsDumpingClassList(JNIEnv *env))
3740 #if INCLUDE_CDS
3741   return ClassListWriter::is_enabled() || DynamicDumpSharedSpaces;
3742 #else
3743   return false;
3744 #endif // INCLUDE_CDS
3745 JVM_END
3746 
3747 JVM_ENTRY(void, JVM_LogLambdaFormInvoker(JNIEnv *env, jstring line))
3748 #if INCLUDE_CDS
3749   assert(ClassListWriter::is_enabled() || DynamicDumpSharedSpaces,  "Should be set and open or do dynamic dump");
3750   if (line != NULL) {
3751     ResourceMark rm(THREAD);
3752     Handle h_line (THREAD, JNIHandles::resolve_non_null(line));
3753     char* c_line = java_lang_String::as_utf8_string(h_line());
3754     if (DynamicDumpSharedSpaces) {
3755       // Note: LambdaFormInvokers::append take same format which is not
3756       // same as below the print format. The line does not include LAMBDA_FORM_TAG.
3757       LambdaFormInvokers::append(os::strdup((const char*)c_line, mtInternal));
3758     }
3759     if (ClassListWriter::is_enabled()) {
3760       ClassListWriter w;
3761       w.stream()->print_cr("%s %s", LAMBDA_FORM_TAG, c_line);
3762     }
3763   }
3764 #endif // INCLUDE_CDS
3765 JVM_END
3766 
3767 JVM_ENTRY(void, JVM_DumpClassListToFile(JNIEnv *env, jstring listFileName))
3768 #if INCLUDE_CDS
3769   ResourceMark rm(THREAD);
3770   Handle file_handle(THREAD, JNIHandles::resolve_non_null(listFileName));
3771   char* file_name  = java_lang_String::as_utf8_string(file_handle());
3772   MetaspaceShared::dump_loaded_classes(file_name, THREAD);
3773 #endif // INCLUDE_CDS
3774 JVM_END
3775 
3776 JVM_ENTRY(void, JVM_DumpDynamicArchive(JNIEnv *env, jstring archiveName))
3777 #if INCLUDE_CDS
3778   ResourceMark rm(THREAD);
3779   Handle file_handle(THREAD, JNIHandles::resolve_non_null(archiveName));
3780   char* archive_name  = java_lang_String::as_utf8_string(file_handle());
3781   DynamicArchive::dump_for_jcmd(archive_name, CHECK);
3782 #endif // INCLUDE_CDS
3783 JVM_END
3784 
3785 // Returns an array of all live Thread objects (VM internal JavaThreads,
3786 // jvmti agent threads, and JNI attaching threads  are skipped)
3787 // See CR 6404306 regarding JNI attaching threads
3788 JVM_ENTRY(jobjectArray, JVM_GetAllThreads(JNIEnv *env, jclass dummy))
3789   ResourceMark rm(THREAD);
3790   ThreadsListEnumerator tle(THREAD, false, false);
3791   JvmtiVMObjectAllocEventCollector oam;
3792 
3793   int num_threads = tle.num_threads();
3794   objArrayOop r = oopFactory::new_objArray(vmClasses::Thread_klass(), num_threads, CHECK_NULL);
3795   objArrayHandle threads_ah(THREAD, r);
3796 
3797   for (int i = 0; i < num_threads; i++) {
3798     Handle h = tle.get_threadObj(i);
3799     threads_ah->obj_at_put(i, h());
3800   }
3801 
3802   return (jobjectArray) JNIHandles::make_local(THREAD, threads_ah());
3803 JVM_END
3804 
3805 
3806 // Support for java.lang.Thread.getStackTrace() and getAllStackTraces() methods
3807 // Return StackTraceElement[][], each element is the stack trace of a thread in
3808 // the corresponding entry in the given threads array
3809 JVM_ENTRY(jobjectArray, JVM_DumpThreads(JNIEnv *env, jclass threadClass, jobjectArray threads))
3810   JvmtiVMObjectAllocEventCollector oam;
3811 
3812   // Check if threads is null
3813   if (threads == NULL) {
3814     THROW_(vmSymbols::java_lang_NullPointerException(), 0);
3815   }
3816 
3817   objArrayOop a = objArrayOop(JNIHandles::resolve_non_null(threads));
3818   objArrayHandle ah(THREAD, a);
3819   int num_threads = ah->length();
3820   // check if threads is non-empty array
3821   if (num_threads == 0) {
3822     THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3823   }
3824 
3825   // check if threads is not an array of objects of Thread class
3826   Klass* k = ObjArrayKlass::cast(ah->klass())->element_klass();
3827   if (k != vmClasses::Thread_klass()) {
3828     THROW_(vmSymbols::java_lang_IllegalArgumentException(), 0);
3829   }
3830 
3831   ResourceMark rm(THREAD);
3832 
3833   GrowableArray<instanceHandle>* thread_handle_array = new GrowableArray<instanceHandle>(num_threads);
3834   for (int i = 0; i < num_threads; i++) {
3835     oop thread_obj = ah->obj_at(i);
3836     instanceHandle h(THREAD, (instanceOop) thread_obj);
3837     thread_handle_array->append(h);
3838   }
3839 
3840   // The JavaThread references in thread_handle_array are validated
3841   // in VM_ThreadDump::doit().
3842   Handle stacktraces = ThreadService::dump_stack_traces(thread_handle_array, num_threads, CHECK_NULL);
3843   return (jobjectArray)JNIHandles::make_local(THREAD, stacktraces());
3844 
3845 JVM_END
3846 
3847 // JVM monitoring and management support
3848 JVM_LEAF(void*, JVM_GetManagement(jint version))
3849   return Management::get_jmm_interface(version);
3850 JVM_END
3851 
3852 // com.sun.tools.attach.VirtualMachine agent properties support
3853 //
3854 // Initialize the agent properties with the properties maintained in the VM
3855 JVM_ENTRY(jobject, JVM_InitAgentProperties(JNIEnv *env, jobject properties))
3856   ResourceMark rm;
3857 
3858   Handle props(THREAD, JNIHandles::resolve_non_null(properties));
3859 
3860   PUTPROP(props, "sun.java.command", Arguments::java_command());
3861   PUTPROP(props, "sun.jvm.flags", Arguments::jvm_flags());
3862   PUTPROP(props, "sun.jvm.args", Arguments::jvm_args());
3863   return properties;
3864 JVM_END
3865 
3866 JVM_ENTRY(jobjectArray, JVM_GetEnclosingMethodInfo(JNIEnv *env, jclass ofClass))
3867 {
3868   JvmtiVMObjectAllocEventCollector oam;
3869 
3870   if (ofClass == NULL) {
3871     return NULL;
3872   }
3873   Handle mirror(THREAD, JNIHandles::resolve_non_null(ofClass));
3874   // Special handling for primitive objects
3875   if (java_lang_Class::is_primitive(mirror())) {
3876     return NULL;
3877   }
3878   Klass* k = java_lang_Class::as_Klass(mirror());
3879   if (!k->is_instance_klass()) {
3880     return NULL;
3881   }
3882   InstanceKlass* ik = InstanceKlass::cast(k);
3883   int encl_method_class_idx = ik->enclosing_method_class_index();
3884   if (encl_method_class_idx == 0) {
3885     return NULL;
3886   }
3887   objArrayOop dest_o = oopFactory::new_objArray(vmClasses::Object_klass(), 3, CHECK_NULL);
3888   objArrayHandle dest(THREAD, dest_o);
3889   Klass* enc_k = ik->constants()->klass_at(encl_method_class_idx, CHECK_NULL);
3890   dest->obj_at_put(0, enc_k->java_mirror());
3891   int encl_method_method_idx = ik->enclosing_method_method_index();
3892   if (encl_method_method_idx != 0) {
3893     Symbol* sym = ik->constants()->symbol_at(
3894                         extract_low_short_from_int(
3895                           ik->constants()->name_and_type_at(encl_method_method_idx)));
3896     Handle str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3897     dest->obj_at_put(1, str());
3898     sym = ik->constants()->symbol_at(
3899               extract_high_short_from_int(
3900                 ik->constants()->name_and_type_at(encl_method_method_idx)));
3901     str = java_lang_String::create_from_symbol(sym, CHECK_NULL);
3902     dest->obj_at_put(2, str());
3903   }
3904   return (jobjectArray) JNIHandles::make_local(THREAD, dest());
3905 }
3906 JVM_END
3907 
3908 // Returns an array of java.lang.String objects containing the input arguments to the VM.
3909 JVM_ENTRY(jobjectArray, JVM_GetVmArguments(JNIEnv *env))
3910   ResourceMark rm(THREAD);
3911 
3912   if (Arguments::num_jvm_args() == 0 && Arguments::num_jvm_flags() == 0) {
3913     return NULL;
3914   }
3915 
3916   char** vm_flags = Arguments::jvm_flags_array();
3917   char** vm_args = Arguments::jvm_args_array();
3918   int num_flags = Arguments::num_jvm_flags();
3919   int num_args = Arguments::num_jvm_args();
3920 
3921   InstanceKlass* ik = vmClasses::String_klass();
3922   objArrayOop r = oopFactory::new_objArray(ik, num_args + num_flags, CHECK_NULL);
3923   objArrayHandle result_h(THREAD, r);
3924 
3925   int index = 0;
3926   for (int j = 0; j < num_flags; j++, index++) {
3927     Handle h = java_lang_String::create_from_platform_dependent_str(vm_flags[j], CHECK_NULL);
3928     result_h->obj_at_put(index, h());
3929   }
3930   for (int i = 0; i < num_args; i++, index++) {
3931     Handle h = java_lang_String::create_from_platform_dependent_str(vm_args[i], CHECK_NULL);
3932     result_h->obj_at_put(index, h());
3933   }
3934   return (jobjectArray) JNIHandles::make_local(THREAD, result_h());
3935 JVM_END
3936 
3937 JVM_LEAF(jint, JVM_FindSignal(const char *name))
3938   return os::get_signal_number(name);
3939 JVM_END
3940 
3941 JVM_ENTRY(void, JVM_VirtualThreadMountBegin(JNIEnv* env, jobject vthread, jboolean first_mount))
3942 #if INCLUDE_JVMTI
3943   if (!DoJVMTIVirtualThreadTransitions) {
3944     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3945     return;
3946   }
3947   JvmtiVTMSTransitionDisabler::start_VTMS_transition(vthread, /* is_mount */ true);
3948 #else
3949   fatal("Should only be called with JVMTI enabled");
3950 #endif
3951 JVM_END
3952 
3953 JVM_ENTRY(void, JVM_VirtualThreadMountEnd(JNIEnv* env, jobject vthread, jboolean first_mount))
3954 #if INCLUDE_JVMTI
3955   if (!DoJVMTIVirtualThreadTransitions) {
3956     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3957     return;
3958   }
3959   oop vt = JNIHandles::resolve(vthread);
3960 
3961   thread->rebind_to_jvmti_thread_state_of(vt);
3962 
3963   {
3964     MutexLocker mu(JvmtiThreadState_lock);
3965     JvmtiThreadState* state = thread->jvmti_thread_state();
3966     if (state != NULL && state->is_pending_interp_only_mode()) {
3967       JvmtiEventController::enter_interp_only_mode();
3968     }
3969   }
3970   assert(thread->is_in_VTMS_transition(), "sanity check");
3971   JvmtiVTMSTransitionDisabler::finish_VTMS_transition(vthread, /* is_mount */ true);
3972   if (first_mount) {
3973     // thread start
3974     if (JvmtiExport::can_support_virtual_threads()) {
3975       JvmtiEventController::thread_started(thread);
3976       if (JvmtiExport::should_post_vthread_start()) {
3977         JvmtiExport::post_vthread_start(vthread);
3978       }
3979     } else { // compatibility for vthread unaware agents: legacy thread_start
3980       if (PostVirtualThreadCompatibleLifecycleEvents &&
3981           JvmtiExport::should_post_thread_life()) {
3982         // JvmtiEventController::thread_started is called here
3983         JvmtiExport::post_thread_start(thread);
3984       }
3985     }
3986   }
3987   if (JvmtiExport::should_post_vthread_mount()) {
3988     JvmtiExport::post_vthread_mount(vthread);
3989   }
3990 #else
3991   fatal("Should only be called with JVMTI enabled");
3992 #endif
3993 JVM_END
3994 
3995 JVM_ENTRY(void, JVM_VirtualThreadUnmountBegin(JNIEnv* env, jobject vthread, jboolean last_unmount))
3996 #if INCLUDE_JVMTI
3997   if (!DoJVMTIVirtualThreadTransitions) {
3998     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
3999     return;
4000   }
4001   HandleMark hm(thread);
4002   Handle ct(thread, thread->threadObj());
4003 
4004   if (JvmtiExport::should_post_vthread_unmount()) {
4005     JvmtiExport::post_vthread_unmount(vthread);
4006   }
4007   if (last_unmount) {
4008     if (JvmtiExport::can_support_virtual_threads()) {
4009       if (JvmtiExport::should_post_vthread_end()) {
4010         JvmtiExport::post_vthread_end(vthread);
4011       }
4012     } else { // compatibility for vthread unaware agents: legacy thread_end
4013       if (PostVirtualThreadCompatibleLifecycleEvents &&
4014           JvmtiExport::should_post_thread_life()) {
4015         JvmtiExport::post_thread_end(thread);
4016       }
4017     }
4018   }
4019 
4020   assert(!thread->is_in_VTMS_transition(), "sanity check");
4021   JvmtiVTMSTransitionDisabler::start_VTMS_transition(vthread, /* is_mount */ false);
4022 
4023   if (last_unmount && thread->jvmti_thread_state() != NULL) {
4024     JvmtiExport::cleanup_thread(thread);
4025     thread->set_jvmti_thread_state(NULL);
4026     oop vt = JNIHandles::resolve(vthread);
4027     java_lang_Thread::set_jvmti_thread_state(vt, NULL);
4028   }
4029   thread->rebind_to_jvmti_thread_state_of(ct());
4030 #else
4031   fatal("Should only be called with JVMTI enabled");
4032 #endif
4033 JVM_END
4034 
4035 JVM_ENTRY(void, JVM_VirtualThreadUnmountEnd(JNIEnv* env, jobject vthread, jboolean last_unmount))
4036 #if INCLUDE_JVMTI
4037   if (!DoJVMTIVirtualThreadTransitions) {
4038     assert(!JvmtiExport::can_support_virtual_threads(), "sanity check");
4039     return;
4040   }
4041   assert(thread->is_in_VTMS_transition(), "sanity check");
4042   JvmtiVTMSTransitionDisabler::finish_VTMS_transition(vthread, /* is_mount */ false);
4043 #else
4044   fatal("Should only be called with JVMTI enabled");
4045 #endif
4046 JVM_END